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1

Acoustic concentration of particles in fluid flow  

DOE Patents (OSTI)

An apparatus for acoustic concentration of particles in a fluid flow includes a substantially acoustically transparent membrane and a vibration generator that define a fluid flow path therebetween. The fluid flow path is in fluid communication with a fluid source and a fluid outlet and the vibration generator is disposed adjacent the fluid flow path and is capable of producing an acoustic field in the fluid flow path. The acoustic field produces at least one pressure minima in the fluid flow path at a predetermined location within the fluid flow path and forces predetermined particles in the fluid flow path to the at least one pressure minima.

Ward, Michael D. (Los Alamos, NM); Kaduchak, Gregory (Los Alamos, NM)

2010-11-23T23:59:59.000Z

2

Bubble-induced damping in displacement-driven microfluidic flows  

E-Print Network (OSTI)

Bubble damping in displacement-driven microfluidic flows was theoretically and experimentally investigated for a Y-channel microfluidic network. The system was found to exhibit linear behavior for typical microfluidic flow ...

Lee, Jongho

3

Energy flow in acoustic black holes  

SciTech Connect

We present the results of an analysis of superradiant energy flow due to scalar fields incident on an acoustic black hole. In addition to providing independent confirmation of the recent results in [E. Berti, V. Cardoso, and J. P. S. Lemos, Phys. Rev. D 70, 124006 (2004).], we determine in detail the profile of energy flow everywhere outside the horizon. We confirm explicitly that in a suitable frame the energy flow is inward at the horizon and outward at infinity, as expected on physical grounds.

Choy, K.; Kruk, T.; Carrington, M.E.; Fugleberg, T.; Zahn, J.; Kobes, R.; Kunstatter, G.; Pickering, D. [Department of Physics, Brandon University, Brandon, Manitoba, R7A 6A9 (Canada) and Winnipeg Institute for Theoretical Physics, Winnipeg, Manitoba (Canada); Department of Physics, University of Winnipeg, Winnipeg, Manitoba, R7A 6A9 (Canada) and Winnipeg Institute for Theoretical Physics, Winnipeg, Manitoba (Canada); Department of Mathematics, Brandon University, Brandon, Manitoba, R7A 6A9 (Canada)

2006-05-15T23:59:59.000Z

4

Acoustically Induced Streaming Flows near a Model Cod Otolith and their Potential Implications for Fish Hearing  

SciTech Connect

The ears of fishes are remarkable sensors for the small acoustic disturbances associated with underwater sound. For example, each ear of the Atlantic cod (Gadus morhua) has three dense bony bodies (otoliths) surrounded by fluid and tissue, and detects sounds at frequencies from 30 to 500 Hz. Atlantic cod have also been shown to localize sounds. However, how their ears perform these functions is not fully understood. Steady streaming, or time-independent, flows near a 350% scale model Atlantic cod otolith immersed in a viscous fluid were studied to determine if these fluid flows contain acoustically relevant information that could be detected by the ear s sensory hair cells. The otolith was oscillated sinusoidally at various orientations at frequencies of 8 24 Hz, corresponding to an actual frequency range of 280 830 Hz. Phaselocked particle pathline visualizations of the resulting flows give velocity, vorticity, and rate of strain fields over a single plane of this mainly two-dimensional flow. Although the streaming flows contain acoustically relevant information, the displacements due to these flows are likely too small to explain Atlantic cod hearing abilities near threshold. The results, however, may suggest a possible mechanism for detection of ultrasound in some fish species.

Kotas, Charlotte W [ORNL; Rogers, Peter [Georgia Institute of Technology; Yoda, Minami [Georgia Institute of Technology

2011-01-01T23:59:59.000Z

5

Acoustic cross-correlation flowmeter for solid-gas flow  

DOE Patents (OSTI)

Apparatus for measuring particle velocity in a solid-gas flow within a pipe includes: first and second transmitting transducers for transmitting first and second ultrasonic signals into the pipe at first and second locations, respectively, along the pipe; an acoustic decoupler, positioned between said first and second transmitting transducers, for acoustically isolating said first and second signals from one another; first and second detecting transducers for detecting said first and second signals and for generating first and second detected signals; and means for cross-correlating said first and second output signals.

Sheen, S.H.; Raptis, A.C.

1984-05-14T23:59:59.000Z

6

Acoustic measurement of the Deepwater Horizon Macondo well flow rate  

E-Print Network (OSTI)

On May 31, 2010, a direct acoustic measurement method was used to quantify fluid leakage rate from the Deepwater Horizon Macondo well prior to removal of its broken riser. This method utilized an acoustic imaging sonar and ...

Camilli, Richard

7

Application of an Acoustic Doppler Current Profiler to Measure Hydro Plant Diversion Flows  

Science Conference Proceedings (OSTI)

For most conventional and pumped-storage hydroelectric plants, accurate and timely knowledge of flow rates is important for cost-effective operation. Acoustic Doppler technology has not been applied in a large power plant intake channel until this project.

2011-08-25T23:59:59.000Z

8

An Intercomparison of Acoustic Current Meter Measurements in Low to Moderate Flow Regions  

Science Conference Proceedings (OSTI)

Instrumented, subsurface moorings deployed in the Scotian shelf and slope regions of the North Atlantic provide data in low to moderate flows for a current meter intercomparison. The primary instruments being evaluated are two acoustic Doppler ...

Adam Drozdowski; Blair J. W. Greenan

2013-08-01T23:59:59.000Z

9

Acoustic Doppler Velocimeter Flow Measurement from an Autonomous Underwater Vehicle with Applications to Deep Ocean Convection  

Science Conference Proceedings (OSTI)

The authors present a new modality for direct measurement of ocean flow, achieved by combining the resolution and precision of an acoustic Doppler velocimeter with the mobility of an autonomous underwater vehicle. To obtain useful measurements, ...

Yanwu Zhang; Knut Streitlien; James G. Bellingham; Arthur B. Baggeroer

2001-12-01T23:59:59.000Z

10

Method and apparatus for acoustically monitoring the flow of suspended solid particulate matter  

DOE Patents (OSTI)

A method and apparatus for monitoring char flow in a coal gasifier system cludes flow monitor circuits which measure acoustic attenuation caused by the presence of char in a char line and provide a char flow/no flow indication and an indication of relative char density. The flow monitor circuits compute the ratio of signals in two frequency bands, a first frequency band representative of background noise, and a second higher frequency band in which background noise is attenuated by the presence of char. Since the second frequency band contains higher frequencies, the ratio can be used to provide a flow/no flow indication. The second band can also be selected so that attenuation is monotonically related to particle concentration, providing a quantitative measure of char concentration.

Roach, Paul D. (Darien, IL); Raptis, Apostolos C. (Downers Grove, IL)

1982-01-01T23:59:59.000Z

11

The effect of expansion-ratio limitations on positive-displacement, total-flow geothermal power systems  

DOE Green Energy (OSTI)

Combined steam-turbine/positive-displacement engine (PDE) geothermal power systems are analyzed thermodynamically and compared with optimized reference flash-steam plants. Three different configurations of combined systems are considered. Treated separately are the cases of self-flowing and pumped wells. Two strategies are investigated that help overcome the inherent expansion-ratio limitation of PDE's: pre-flashing and pre-mixing. Parametrically-obtained results show the required minimum PDE efficiency for the combined system to match the reference plant for various sets of design conditions.

DiPippo, R.

1982-02-01T23:59:59.000Z

12

A New Method for Measuring Flow Structure in the Benthic Boundary Layer Using an Acoustic Doppler Velocimeter  

Science Conference Proceedings (OSTI)

A new system for precise measurement of vertical profiles of mean and turbulent flow structure immediately above the sediment–water interface is introduced. This system has an acoustic Doppler velocimeter (ADV) attached to an elevation system to ...

Tetsunori Inoue; Yoshiyuki Nakamura; Mikio Sayama

2008-05-01T23:59:59.000Z

13

A Self-Contained Acoustic Scintillation Instrument for Path-Averaged Measurements of Flow and Turbulence with Application to Hydrothermal Vent and Bottom Boundary Layer Dynamics  

Science Conference Proceedings (OSTI)

A self-contained acoustical scintillation instrument is described that has been used to measure flow and turbulence characteristics in two diverse oceanographic settings. This instrument is a battery-operated and internally logging acoustic ...

D. Di Iorio; D. Lemon; R. Chave

2005-10-01T23:59:59.000Z

14

Method and apparatus for acoustically monitoring the flow of suspended solid particulate matter. [Patent application; monitoring char flow in coal gasifier  

DOE Patents (OSTI)

A method and apparatus for monitoring char flow in a coal gasifier system includes flow monitor circuits which measure acoustic attenuation caused by the presence of char in a char line and provides a char flow/no flow indication and an indication of relative char density. The flow monitor circuits compute the ratio of signals in two frequency bands, a first frequency band representative of background noise, and a second higher frequency band in which background noise is attenuated by the presence of char. Since the second frequency band contains higher frequencies, the ratio can be used to provide a flow/no flow indication. The second band can also be selected so that attenuation is monotonically related to particle concentration, providing a quantitative measure of char concentration.

Roach, P.D.; Raptis, A.C.

1980-11-24T23:59:59.000Z

15

Fully Nonlinear Edge Gyrokinetic Simulations of Kinetic Geodesic-Acoustic Modes and Boundary Flows  

Science Conference Proceedings (OSTI)

We present edge gyrokinetic neoclassical simulations of tokamak plasmas using the fully nonlinear (full-f) continuum code TEMPEST. A nonlinear Boltzmann model is used for the electrons. The electric field is obtained by solving the 2D gyrokinetic Poisson Equation. We demonstrate the following: (1) High harmonic resonances (n > 2) significantly enhance geodesic-acoustic mode (GAM) damping at high-q (tokamak safety factor), and are necessary to explain both the damping observed in our TEMPEST q-scans and experimental measurements of the scaling of the GAM amplitude with edge q{sub 95} in the absence of obvious evidence that there is a strong q dependence of the turbulent drive and damping of the GAM. (2) The kinetic GAM exists in the edge for steep density and temperature gradients in the form of outgoing waves, its radial scale is set by the ion temperature profile, and ion temperature inhomogeneity is necessary for GAM radial propagation. (3) The development of the neoclassical electric field evolves through different phases of relaxation, including GAMs, their radial propagation, and their long-time collisional decay. (4) Natural consequences of orbits in the pedestal and scrape-off layer region in divertor geometry are substantial non-Maxwellian ion distributions and flow characteristics qualitatively like those observed in experiments.

Xu, X Q; Belli, E; Bodi, K; Candy, J; Chang, C S; Cohen, B I; Cohen, R H; Colella, P; Dimits, A M; Dorr, M R; Gao, Z; Hittinger, J A; Ko, S; Krasheninnikov, S; McKee, G R; Nevins, W M; Rognlien, T D; Snyder, P B; Suh, J; Umansky, M V

2008-09-18T23:59:59.000Z

16

An Energy Signature Scheme for Steam Trap Assessment and Flow Rate Estimation Using Pipe-Induced Acoustic Measurements  

SciTech Connect

The US Congress has passed legislation dictating that all government agencies establish a plan and process for improving energy efficiencies at their sites. In response to this legislation, Oak Ridge National Laboratory (ORNL) has recently conducted a pilot study to explore the deployment of a wireless sensor system for a real-time measurement-based energy efficiency optimization framework within the steam distribution system within the ORNL campus. We make assessments on the real-time status of the distribution system by observing the state measurements of acoustic sensors mounted on the steam pipes/traps/valves. In this paper, we describe a spectral-based energy signature scheme that interprets acoustic vibration sensor data to estimate steam flow rates and assess steam traps health status. Experimental results show that the energy signature scheme has the potential to identify different steam trap health status and it has sufficient sensitivity to estimate steam flow rate. Moreover, results indicate a nearly quadratic relationship over the test region between the overall energy signature factor and flow rate in the pipe. The analysis based on estimated steam flow and steam trap status helps generate alerts that enable operators and maintenance personnel to take remedial action. The goal is to achieve significant energy-saving in steam lines by monitoring and acting on leaking steam pipes/traps/valves.

Olama, Mohammed M [ORNL; Allgood, Glenn O [ORNL; Kuruganti, Phani Teja [ORNL; Lake, Joe E [ORNL

2012-01-01T23:59:59.000Z

17

Method of making self-calibrated displacement measurements  

DOE Patents (OSTI)

A method for monitoring the displacement of an object having an acoustically reflective surface at least partially submerged in an acoustically conductive medium. The reflective surface is designed to have a stepped interface responsive to an incident acoustic pulse to provide separate discrete reflected pulses to a receiving transducer. The difference in the time of flight of the reflected acoustic signals corresponds to the known step height and the time of travel of the signals to the receiving transducer provides a measure of the displacement of the object. Accordingly, the reference step length enables simultaneous calibration of each displacement measurement.

Pedersen, Herbert N. (Richland, WA)

1977-01-01T23:59:59.000Z

18

Passive Acoustic Detection of Wind Turbine In-Flow Conditions for Active Control and Optimization  

DOE Green Energy (OSTI)

Wind is a significant source of energy; however, the human capability to produce electrical energy still has many hurdles to overcome. One of these is the unpredictability of the winds in the atmospheric boundary layer (ABL). The ABL is highly turbulent in both stable and unstable conditions (based on the vertical temperature profile) and the resulting fluctuations can have a dramatic impact on wind turbine operation. Any method by which these fluctuations could be observed, estimated, or predicted could provide a benefit to the wind energy industry as a whole. Based on the fundamental coupling of velocity fluctuations to pressure fluctuations in the nearly incompressible flow in the ABL, This work hypothesizes that a ground-based array of infrasonic pressure transducers could be employed to estimate the vertical wind profile over a height relevant for wind turbines. To analyze this hypothesis, experiments and field deployments were conducted. Wind tunnel experiments were performed for a thick turbulent boundary layer over a neutral or heated surface. Surface pressure and velocity probe measurements were acquired simultaneously. Two field deployments yielded surface pressure data from a 49 element array. The second deployment at the Reese Technology Center in Lubbock, TX, also included data from a smaller aperture, 96-element array and a 200-meter tall meteorological tower. Analysis of the data successfully demonstrated the ability to estimate the vertical velocity profile using coherence data from the pressure array. Also, dynamical systems analysis methods were successful in identifying and tracking a gust type event. In addition to the passive acoustic profiling method, this program also investigated a rapid response Doppler SODAR system, the optimization of wind turbine blades for enhanced power with reduced aeroacoustic noise production, and the implementation of a wireless health monitoring system for the wind turbine blades. Each of these other objectives was met successfully. The use of phase unwrapping applied to SODAR data was found to yield reasonable results for per-pulse measurements. A health monitoring system design analysis was able to demonstrate the ability to use a very small number of sensors to monitor blade health based on the blade's overall structural modes. Most notable was the development of a multi-objective optimization methodology that successfully yielded an aerodynamic blade design that produces greater power output with reduced aerodynamic loading noise. This optimization method could be significant for future design work.

Murray, Nathan E.

2012-03-12T23:59:59.000Z

19

Water displacement mercury pump  

DOE Patents (OSTI)

A water displacement mercury pump has a fluid inlet conduit and diffuser, a valve, a pressure cannister, and a fluid outlet conduit. The valve has a valve head which seats in an opening in the cannister. The entire assembly is readily insertable into a process vessel which produces mercury as a product. As the mercury settles, it flows into the opening in the cannister displacing lighter material. When the valve is in a closed position, the pressure cannister is sealed except for the fluid inlet conduit and the fluid outlet conduit. Introduction of a lighter fluid into the cannister will act to displace a heavier fluid from the cannister via the fluid outlet conduit. The entire pump assembly penetrates only a top wall of the process vessel, and not the sides or the bottom wall of the process vessel. This insures a leak-proof environment and is especially suitable for processing of hazardous materials.

Nielsen, Marshall G. (Woodside, CA)

1985-01-01T23:59:59.000Z

20

Water displacement mercury pump  

DOE Patents (OSTI)

A water displacement mercury pump has a fluid inlet conduit and diffuser, a valve, a pressure cannister, and a fluid outlet conduit. The valve has a valve head which seats in an opening in the cannister. The entire assembly is readily insertable into a process vessel which produces mercury as a product. As the mercury settles, it flows into the opening in the cannister displacing lighter material. When the valve is in a closed position, the pressure cannister is sealed except for the fluid inlet conduit and the fluid outlet conduit. Introduction of a lighter fluid into the cannister will act to displace a heavier fluid from the cannister via the fluid outlet conduit. The entire pump assembly penetrates only a top wall of the process vessel, and not the sides or the bottom wall of the process vessel. This insures a leak-proof environment and is especially suitable for processing of hazardous materials.

Nielsen, M.G.

1984-04-20T23:59:59.000Z

Note: This page contains sample records for the topic "acoustics displacement flow" 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

The acoustics of curved and lined cylindrical ducts with mean flow  

E-Print Network (OSTI)

imposes further restrictions on ?. The boundary is modelled as a flexible impermeable surface with impedance Z(k, ?,m). Rienstra (2003a) used this as a model for an aeroengine acoustic lining, since in the limit of vanishing viscosity the boundary layer...

Brambley, Edward James

2007-10-23T23:59:59.000Z

22

Control of acoustics and store separation in a cavity in supersonic flow  

E-Print Network (OSTI)

The supersonic flight community is currently faced with two cavity-under-cross-flow related problems, one being the high noise levels inside the cavity and the other being the return of a store into the cavity after being ...

Sahoo, Debashis, 1976-

2005-01-01T23:59:59.000Z

23

ESTIMATION OF DISPLACEMENT LOCATION FOR ENHANCED  

E-Print Network (OSTI)

high quality displacement tracking at the first stage of signal processing. Examples include quasistatic compression imaging [26, 29], axial shear wave imaging [32] and acoustic radiation force imaging for soft tissue tumours [7, 9, 28], monitoring of atherosclerosis [6], assessment of skin pathologies [8

Gee, Andrew

24

Acoustic Telemetry Evaluation of Juvenile Salmonid Passage and Survival at John Day Dam with Emphasis on the Prototype Surface Flow Outlet, 2008  

DOE Green Energy (OSTI)

The main purpose of the study was to evaluate the performance of Top Spill Weirs installed at two spillbays at John Day Dam and evaluate the effectiveness of these surface flow outlets at attracting juvenile salmon away from the powerhouse and reducing turbine passage. The Juvenile Salmonid Acoustic Telemetry System (JSATS) was used to estimate survival of juvenile salmonids passing the dam and also for calculating performance metrics used to evaluate the efficiency and effectiveness of the dam at passing juvenile salmonids.

Weiland, Mark A.; Ploskey, Gene R.; Hughes, James S.; Deng, Zhiqun; Fu, Tao; Monter, Tyrell J.; Johnson, Gary E.; Khan, Fenton; Wilberding, Matthew C.; Cushing, Aaron W.; Zimmerman, Shon A.; Faber, Derrek M.; Durham, Robin E.; Townsend, Richard L.; Skalski, John R.; Kim, Jina; Fischer, Eric S.; Meyer, Matthew M.

2009-12-01T23:59:59.000Z

25

Analytical and experimental study of the acoustics and the flow field characteristics of cavitating self-resonating water jets  

DOE Green Energy (OSTI)

Waterjet nozzles (STRATOJETS) have been developed which achieve passive structuring of cavitating submerged jets into discrete ring vortices, and which possess cavitation incipient numbers six times higher than obtained with conventional cavitating jet nozzles. In this study we developed analytical and numerical techniques and conducted experimental work to gain an understanding of the basic phenomena involved. The achievements are: (1) a thorough analysis of the acoustic dynamics of the feed pipe to the nozzle; (2) a theory for bubble ring growth and collapse; (3) a numerical model for jet simulation; (4) an experimental observation and analysis of candidate second-generation low-sigma STRATOJETS. From this study we can conclude that intensification of bubble ring collapse and design of highly resonant feed tubes can lead to improved drilling rates. The models here described are excellent tools to analyze the various parameters needed for STRATOJET optimizations. Further analysis is needed to introduce such important factors as viscosity, nozzle-jet interaction, and ring-target interaction, and to develop the jet simulation model to describe the important fine details of the flow field at the nozzle exit.

Chahine, G.L.; Genoux, P.F.; Johnson, V.E. Jr.; Frederick, G.S.

1984-09-01T23:59:59.000Z

26

Particle analysis in an acoustic cytometer  

SciTech Connect

The present invention is a method and apparatus for acoustically manipulating one or more particles. Acoustically manipulated particles may be separated by size. The particles may be flowed in a flow stream and acoustic radiation pressure, which may be radial, may be applied to the flow stream. This application of acoustic radiation pressure may separate the particles. In one embodiment, the particles may be separated by size, and as a further example, the larger particles may be transported to a central axis.

Kaduchak, Gregory; Ward, Michael D

2012-09-18T23:59:59.000Z

27

Displacer for Stirling engine  

SciTech Connect

In a Stirling engine and the like, a displacer piston having a plurality of internal baffles and insulation so as to prevent undesired heat transfer across the displacer piston.

Brown, A. T.

1985-12-24T23:59:59.000Z

28

Acoustic cooling engine  

DOE Patents (OSTI)

An acoustic cooling engine with improved thermal performance and reduced internal losses comprises a compressible fluid contained in a resonant pressure vessel. The fluid has a substantial thermal expansion coefficient and is capable of supporting an acoustic standing wave. A thermodynamic element has first and second ends and is located in the resonant pressure vessel in thermal communication with the fluid. The thermal response of the thermodynamic element to the acoustic standing wave pumps heat from the second end to the first end. The thermodynamic element permits substantial flow of the fluid through the thermodynamic element. An acoustic driver cyclically drives the fluid with an acoustic standing wave. The driver is at a location of maximum acoustic impedance in the resonant pressure vessel and proximate the first end of the thermodynamic element. A hot heat exchanger is adjacent to and in thermal communication with the first end of the thermodynamic element. The hot heat exchanger conducts heat from the first end to portions of the resonant pressure vessel proximate the hot heat exchanger. The hot heat exchanger permits substantial flow of the fluid through the hot heat exchanger. The resonant pressure vessel can include a housing less than one quarter wavelength in length coupled to a reservoir. The housing can include a reduced diameter portion communicating with the reservoir. The frequency of the acoustic driver can be continuously controlled so as to maintain resonance.

Hofler, Thomas J. (Los Alamos, NM); Wheatley, John C. (Los Alamos, NM); Swift, Gregory W. (Santa Fe, NM); Migliori, Albert (Santa Fe, NM)

1988-01-01T23:59:59.000Z

29

Acoustic well cleaner  

DOE Patents (OSTI)

A method and apparatus are disclosed for cleaning the wellbore and the near wellbore region. A sonde is provided which is adapted to be lowered into a borehole and which includes a plurality of acoustic transducers arranged around the sonde. Electrical power provided by a cable is converted to acoustic energy. The high intensity acoustic energy directed to the borehole wall and into the near wellbore region, redissolves or resuspends the material which is reducing the permeability of the formation and/or restricting flow in the wellbore.

Maki, Jr., Voldi E. (11904 Bell Ave., Austin, TX 78759-2415); Sharma, Mukul M. (Dept. of Petroleum Engr. Univ. of Texas, Austin, TX 78712)

1997-01-21T23:59:59.000Z

30

DEVELOPMENT OF A LONG WAVELENGTH ACOUSTIC ...  

Science Conference Proceedings (OSTI)

... are developing a long-wavelength acoustic flowmeter (LWAF) for accurate, economical measurements of exhaust flows from coal-burning power ...

31

Mechanisms of oil displacement by microorganisms  

SciTech Connect

Mechanisms of oil displacement at the oil-brine-sand interfaces by bacteria were investigated by microscopic observations and capillary pressure changes using unconsolidated, thin, reservoir flow cells. Three genera of bacteria, Bacillus, Pseudomonas, and Clostridium, were injected into water-wet and oil-wet cells of unconsolidated sand, saturated with brine and crude oil. The flow cells were placed under a microscope for visual and photographic observations. The flow cells were connected to a manometer to examine the complete capillary pressure hysteresis loop before and after introduction of bacteria. The thin reservoir flow cells were first saturated with brine, and then displaced to irreducible water saturation with crude oil. Oil and brine displacements were then made to determine the complete capillary pressure relationship. Next, the bacteria and nutrients were introduced and incubated in the flow cell for 24-48 hours. Microscopic observations were recorded photographically. After incubation, oil and brine displacements were again made to determine the capillary pressure hysteresis loop.

Kianipey, S.A.; Donaldson, E.C.

1986-01-01T23:59:59.000Z

32

Apparatus for separating particles utilizing engineered acoustic contrast capture particles  

DOE Patents (OSTI)

An apparatus for separating particles from a medium includes a capillary defining a flow path therein that is in fluid communication with a medium source. The medium source includes engineered acoustic contrast capture particle having a predetermined acoustic contrast. The apparatus includes a vibration generator that is operable to produce at least one acoustic field within the flow path. The acoustic field produces a force potential minima for positive acoustic contrast particles and a force potential minima for negative acoustic contrast particles in the flow path and drives the engineered acoustic contrast capture particles to either the force potential minima for positive acoustic contrast particles or the force potential minima for negative acoustic contrast particles.

Kaduchak, Gregory (Los Alamos, NM); Ward, Michael D. (Los Alamos, NM)

2011-12-27T23:59:59.000Z

33

Acoustic Camera Evaluation of Juvenile Salmonid Approach and Fate at Surface Flow Outlets of Two Hydropower Dams  

DOE Green Energy (OSTI)

The objective of this study was to estimate and compare fate probabilities for juvenile salmon approaching two surface flow outlets (SFOs) to identify effective design characteristics. The SFOs differed principally in forebay location, depth, discharge, and water velocity over a sharp-crested weir. Both outlets were about 20 ft wide. The 22-ft deep Bonneville Powerhouse 2 Corner Collector (B2CC) was located in the southwest corner of the forebay and passed 5,000 ft3/s of water at normal-pool elevation. In contrast, The Dalles Dam ice and trash sluiceway outlet above Main Unit 1-3 (TDITC) was not located in a forebay corner, was only 7-ft deep, and discharged about 933 ft3/s at normal-pool elevation. The linear velocity of water over the weir was about 15 ft/s at the B2CC and 5 ft/s at the TDITC. We used a Dual-Frequency Identification Sonar (DIDSON) to record movements of fish within about 65 ft of the B2CC and within 35 ft of the TDITC. We actively tracked fish by manually adjusting pan and tilt rotator angles to keep targets in view. Contrary to expectations, active tracking did not provide a predominance of long tracks that clearly indicated fish fate because most tracks were incomplete. Active tracking did increase error in fish-position estimation, which complicated data processing, so we plan to sample multiple fixed zones in the future. The probability of fish entering each SFO was estimated by a Markov chain analysis, which did not require complete fish tracks. At the B2CC, we tracked 7,943 juvenile salmonids and most of them entered the B2CC. Fish moving south 40 to 60 ft upstream of the dam face were more likely to enter the eddy at the south end of the powerhouse than to enter the B2CC. At the TDITC, we tracked 2,821 smolts. Fish movement was complex with active swimming toward and away from the entrance. The high entrance probability zone (EPZ), where over 90% of tracked fish entered the SFO, extended 32 ft out at the B2CC and only 8 ft out at the TDITC. Greater discharge at the B2CC pushed the entrainment zone (EZ - where flow exceeded 7 ft/s) upstream from the entrance so that fish were entrained before they began to struggle against the flow. The high EPZ also was extended by flow along the powerhouse face at both sites, but more at the B2CC (about 450 ft) than at the TDITC (about 50 ft). Fish entering the large south eddy that circulated past the B2CC entrance were provided multiple opportunities to discover and enter. In contrast, fish moving past the sampled TDITC entrance either entered adjacent sluiceway openings or moved west to the spillway because there was no eddy to provide additional opportunities. Information from our study should be useful to fisheries managers and engineers seeking to transfer SFO technologies from one site to another. There are two important components to designing SFOs, the location within the forebay to take advantage of forebay circulation and specific entrance characteristics such as discharge and depth which affect the size and shape of the EZ and the high EPZ. Providing SFOs with an EZ extending upstream of structure could reduce entrance rejection, decrease forebay residence time and risk of predation, and increase passage of schools of smolts.

Ploskey, Gene R.; Johnson, Gary E.; Weiland, Mark A.; Khan, Fenton; Mueller, Robert P.; Serkowski, John A.; Rakowski, Cynthia L.; Hedgepeth, J.; Skalski, John R.; Ebberts, Blaine D.; Klatte, Bernard A.

2006-08-04T23:59:59.000Z

34

Design methods for displacement ventilation: Critical review.  

E-Print Network (OSTI)

Displacement Ventilation. ASHRAE Research project-RP-949.displacement ventilation. ASHRAE Transaction, 96 (1). Ar ???due to displacement ventilation. ASHRAE Transaction, 96 (1).

Schiavon, Stefano

2006-01-01T23:59:59.000Z

35

Variable displacement blower  

DOE Patents (OSTI)

A blower having a stationary casing for rotatably supporting a rotor assembly having a series of open ended chambers arranged to close against the surrounding walls of the casing. Pistons are slidably mounted within each chamber with the center of rotation of the pistons being offset in regard to the center of rotation of the rotor assembly whereby the pistons reciprocate in the chambers as the rotor assembly turns. As inlet port communicates with the rotor assembly to deliver a working substance into the chamber as the pistons approach a top dead center position in the chamber while an outlet port also communicates with the rotor to exhaust the working substance as the pistons approach a bottom dead center position. The displacement of the blower is varied by adjusting the amount of eccentricity between the center of rotation of the pistons and the center of rotation of the rotor assembly.

Bookout, Charles C. (Niskayuna, NY); Stotts, Robert E. (Clifton Park, NY); Waring, Douglass R. (Ballston Spa, NY); Folsom, Lawrence R. (Ohain, BE)

1986-01-01T23:59:59.000Z

36

Evaluation of the Fenton Hill Hot Dry Rock Geothermal Reservoir. Part I. Heat extraction performance and modeling. Part II. Flow characteristics and geochemistry. Part III. Reservoir characterization using acoustic techniques  

DOE Green Energy (OSTI)

On May 28, 1977, as the production well GT-2 at Fenton Hill was being redrilled along a planned trajectory, it intersected a low-impedance hydraulic fracture in direct communication with the injection well, EE-1. Thus, a necessary prerequisite for a full-scale test of the LASL Hot Dry Rock Concept, that of establishing a high flow rate between wells at low wellhead differential pressures, was satisified. Full-scale operation of the loop occurred for 75 days from January 27 to April 12, 1978. This test is referred to as Phase 1, Segment 2 and was designed to examine the thermal drawdown, flow characteristics, water losses, and fluid geochemistry of the system in detail. Results of these studies are the major topic of this paper which is divided into three separate parts covering first the heat extraction performance, second the flow characteristics and geochemistry and third the use of acoustic techniques to describe the geometry of the fracture system. In the third section, dual-well acoustic measurements used to detect fractures are described. These measurements were made using modified Dresser Atlas logging tools. Signals intersecting hydraulic fractures in the reservoir under both hydrostatic and pressurized conditions were simultaneously detected in both wells. Signal attenuation and characteristic waveforms can be used to describe the extent of fractured rock in the reservoir.

Murphy, H.D.; Grigsby, C.O.; Tester, J.W.; Albright, J.N.

1978-01-01T23:59:59.000Z

37

Acoustically enhanced heat exchange and drying apparatus  

DOE Patents (OSTI)

A heat transfer apparatus includes a first chamber having a first heat transfer gas inlet, a second heat transfer gas inlet, and an outlet. A first heat transfer gas source provides a first gas flow to the first chamber through the first heat transfer gas inlet. A second gas flow through a second chamber connected to the side of the first chamber, generates acoustic waves which bring about acoustical coupling of the first and second gases in the acoustically augmented first chamber. The first chamber may also include a material inlet for receiving material to be dried, in which case the gas outlet serves as a dried material and gas outlet.

Bramlette, T. Tazwell (Livermore, CA); Keller, Jay O. (Oakland, CA)

1989-01-01T23:59:59.000Z

38

Underwater Nonlinear Acoustic Speaker.  

E-Print Network (OSTI)

??In this work an acoustic parametric array for underwater use was designed, built and tested. An acoustic parametric array creates a focused beam of sound… (more)

Andersson, Sara

2011-01-01T23:59:59.000Z

39

Evaluation of the Acoustic Doppler Velocimeter (ADV) for Turbulence Measurements*  

Science Conference Proceedings (OSTI)

Accuracy of the acoustic Doppler velocimeter (ADV) is evaluated in this paper. Simultaneous measurements of open-channel flow were undertaken in a 17-m flume using an ADV and a laser Doppler velocimeter. Flow velocity records obtained by both ...

G. Voulgaris; J. H. Trowbridge

1998-02-01T23:59:59.000Z

40

Acoustic horizons in nuclear fluids  

E-Print Network (OSTI)

We consider a hydrodynamic description of the spherically symmetric outward flow of nuclear matter, accommodating dispersion in it as a very weak effect. About the resulting stationary conditions in the flow, we apply an Eulerian scheme to derive a fully nonlinear equation of a time-dependent radial perturbation. In its linearized limit, with no dispersion, this equation implies the static acoustic horizon of an analogue gravity model. We, however, show that time-dependent nonlinear effects destabilize the static horizon. We also model the perturbation as a high-frequency travelling wave, and perform a {\\it WKB} analysis, in which the effect of weak dispersion is studied iteratively. We show that even arbitrarily small values of dispersion make the horizon fully opaque to any acoustic disturbance propagating against the bulk flow, with the amplitude and the energy flux of the radial perturbation undergoing a discontinuity at the horizon, and decaying exponentially just outside it.

Niladri Sarkar; Abhik Basu; Jayanta K. Bhattacharjee; Arnab K. Ray

2013-06-03T23:59:59.000Z

Note: This page contains sample records for the topic "acoustics displacement flow" 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

Acoustic transducer  

DOE Patents (OSTI)

An acoustic transducer is described comprising a one-piece hollow mandrel into the outer surface of which is formed a recess with sides perpendicular to the central axis of the mandrel and separated by a first distance and with a bottom parallel to the central axis and within which recess are a plurality of washer-shaped discs of a piezoelectric material and at least one disc of a temperature-compensating material with the discs being captured between the sides of the recess in a pre-stressed interference fit, typically at 2,000 psi of compressive stress. The transducer also includes a power supply and means to connect to a measurement device. The transducer is intended to be used for telemetry between a measurement device located downhole in an oil or gas well and the surface. The transducer is of an construction that is stronger with fewer joints that could leak fluids into the recess holding the piezoelectric elements than is found in previous acoustic transducers. 4 figs.

Drumheller, D.S.

1997-12-30T23:59:59.000Z

42

Acoustic transducer  

DOE Patents (OSTI)

An acoustic transducer comprising a one-piece hollow mandrel into the outer surface of which is formed a recess with sides perpendicular to the central axis of the mandrel and separated by a first distance and with a bottom parallel to the central axis and within which recess are a plurality of washer-shaped discs of a piezoelectric material and at least one disc of a temperature-compensating material with the discs being captured between the sides of the recess in a pre-stressed interference fit, typically at 2000 psi of compressive stress. The transducer also includes a power supply and means to connect to a measurement device. The transducer is intended to be used for telemetry between a measurement device located downhole in an oil or gas well and the surface. The transducer is of an construction that is stronger with fewer joints that could leak fluids into the recess holding the piezoelectric elements than is found in previous acoustic transducers.

Drumheller, Douglas S. (Cedar Crest, NM)

1997-01-01T23:59:59.000Z

43

Acoustic cryocooler  

DOE Patents (OSTI)

An acoustic cryocooler with no moving parts is formed from a thermoacoustic driver (TAD) driving a pulse tube refrigerator (PTR) through a standing wave tube. Thermoacoustic elements in the TAD are spaced apart a distance effective to accommodate the increased thermal penetration length arising from the relatively low TAD operating frequency in the range of 15-60 Hz. At these low operating frequencies, a long tube is required to support the standing wave. The tube may be coiled to reduce the overall length of the cryocooler. One or two PTR's are located on the standing wave tube adjacent antinodes in the standing wave to be driven by the standing wave pressure oscillations. It is predicted that a heat input of 1000 W at 1000 K will maintain a cooling load of 5 W at 80 K. 3 figs.

Swift, G.W.; Martin, R.A.; Radebaugh, R.

1989-09-26T23:59:59.000Z

44

Acoustic cryocooler  

DOE Patents (OSTI)

An acoustic cryocooler with no moving parts is formed from a thermoacoustic driver (TAD) driving a pulse tube refrigerator (PTR) through a standing wave tube. Thermoacoustic elements in the TAD are spaced apart a distance effective to accommodate the increased thermal penetration length arising from the relatively low TAD operating frequency in the range of 15-60 Hz. At these low operating frequencies, a long tube is required to support the standing wave. The tube may be coiled to reduce the overall length of the cryocooler. One or two PTR's are located on the standing wave tube adjacent antinodes in the standing wave to be driven by the standing wave pressure oscillations. It is predicted that a heat input of 1000 W at 1000 K will maintian a cooling load of 5 W at 80 K.

Swift, Gregory W. (Santa Fe, NM); Martin, Richard A. (Los Alamos, NM); Radenbaugh, Ray (Louisville, CO)

1990-01-01T23:59:59.000Z

45

Acoustic telemetry.  

Science Conference Proceedings (OSTI)

Broadcasting messages through the earth is a daunting task. Indeed, broadcasting a normal telephone conversion through the earth by wireless means is impossible with todays technology. Most of us don't care, but some do. Industries that drill into the earth need wireless communication to broadcast navigation parameters. This allows them to steer their drill bits. They also need information about the natural formation that they are drilling. Measurements of parameters such as pressure, temperature, and gamma radiation levels can tell them if they have found a valuable resource such as a geothermal reservoir or a stratum bearing natural gas. Wireless communication methods are available to the drilling industry. Information is broadcast via either pressure waves in the drilling fluid or electromagnetic waves in the earth and well tubing. Data transmission can only travel one way at rates around a few baud. Given that normal Internet telephone modems operate near 20,000 baud, these data rates are truly very slow. Moreover, communication is often interrupted or permanently blocked by drilling conditions or natural formation properties. Here we describe a tool that communicates with stress waves traveling through the steel drill pipe and production tubing in the well. It's based on an old idea called Acoustic Telemetry. But what we present here is more than an idea. This tool exists, it's drilled several wells, and it works. Currently, it's the first and only acoustic telemetry tool that can withstand the drilling environment. It broadcasts one way over a limited range at much faster rates than existing methods, but we also know how build a system that can communicate both up and down wells of indefinite length.

Drumheller, Douglas Schaeffer; Kuszmaul, Scott S.

2003-08-01T23:59:59.000Z

46

A novel approach to modeling unstable EOR displacements. Final report  

Science Conference Proceedings (OSTI)

Most enhanced oil recovery schemes involve the displacement of a more dense and more viscous oil by a less dense and less viscous fluid in a heterogeneous porous medium. The interaction of heterogeneity with the several competing forces, namely, viscous, capillary, gravitational, and dispersive forces, can conspire to make the displacements unstable and difficult to model and to predict. The objective of this research was to develop a systematic methodology for modeling unstable fluid displacements in heterogeneous media. Flow visualization experiments were conducted using X-ray computed tomography imaging and a video imaging workstation to gain insights into the dynamics of unstable displacements, acquire detailed quantitative experimental image data for calibrating numerical models of unstable displacements, and image and characterize heterogeneities in laboratory cores geostatistically. High-resolution numerical models modified for use on vector-architecture supercomputers were used to replicate the image data. Geostatistical models of reservoir heterogeneity were incorporated in order to study the interaction of hydrodynamic instability and heterogeneity in reservoir displacements. Finally, a systematic methodology for matching the experimental data with the numerical models and scaling the laboratory results to other systems were developed. The result is a new method for predicting the performance of unstable EOR displacements in the field based on small-scale displacements in the laboratory. The methodology is general and can be applied to forecast the performance of most processes that involve fluid flow and transport in porous media. Therefore, this research should be of interest to those involved in forecasting the performance of enhanced oil recovery processes and the spreading of contaminants in heterogeneous aquifers.

Peters, E.J.

1994-04-01T23:59:59.000Z

47

Analysis of Bottom-Track and Compass Error in a Self-Contained Acoustic Doppler Diver Navigation Console  

Science Conference Proceedings (OSTI)

The Cobra-Tac (Teledyne RD Instruments) is a self-contained diver navigation system based on acoustic Doppler velocity log (DVL) technology that uses dead reckoning to compute displacements from a known starting point. The navigational accuracy ...

James L. Hench; Johanna H. Rosman

2010-07-01T23:59:59.000Z

48

Transient digitizer with displacement current samplers  

DOE Patents (OSTI)

A low component count, high speed sample gate, and digitizer architecture using the sample gates is based on use of a signal transmission line, a strobe transmission line and a plurality of sample gates connected to the sample transmission line at a plurality of positions. The sample gates include a strobe pickoff structure near the strobe transmission line which generates a charge displacement current in response to propagation of the strobe signal on the strobe transmission line sufficient to trigger the sample gate. The sample gate comprises a two-diode sampling bridge and is connected to a meandered signal transmission line at one end and to a charge-holding cap at the other. The common cathodes are reverse biased. A voltage step is propagated down the strobe transmission line. As the step propagates past a capacitive pickoff, displacement current i=c(dv/dT), flows into the cathodes, driving the bridge into conduction and thereby charging the charge-holding capacitor to a value related to the signal. A charge amplifier converts the charge on the charge-holding capacitor to an output voltage. The sampler is mounted on a printed circuit board, and the sample transmission line and strobe transmission line comprise coplanar microstrips formed on a surface of the substrate. Also, the strobe pickoff structure may comprise a planar pad adjacent the strobe transmission line on the printed circuit board. 16 figs.

McEwan, T.E.

1996-05-21T23:59:59.000Z

49

Transient digitizer with displacement current samplers  

DOE Patents (OSTI)

A low component count, high speed sample gate, and digitizer architecture using the sample gates is based on use of a signal transmission line, a strobe transmission line and a plurality of sample gates connected to the sample transmission line at a plurality of positions. The sample gates include a strobe pickoff structure near the strobe transmission line which generates a charge displacement current in response to propagation of the strobe signal on the strobe transmission line sufficient to trigger the sample gate. The sample gate comprises a two-diode sampling bridge and is connected to a meandered signal transmission line at one end and to a charge-holding cap at the other. The common cathodes are reverse biased. A voltage step is propagated down the strobe transmission line. As the step propagates past a capacitive pickoff, displacement current i=c(dv/dT), flows into the cathodes, driving the bridge into conduction and thereby charging the charge-holding capacitor to a value related to the signal. A charge amplifier converts the charge on the charge-holding capacitor to an output voltage. The sampler is mounted on a printed circuit board, and the sample transmission line and strobe transmission line comprise coplanar microstrips formed on a surface of the substrate. Also, the strobe pickoff structure may comprise a planar pad adjacent the strobe transmission line on the printed circuit board.

McEwan, Thomas E. (Livermore, CA)

1996-01-01T23:59:59.000Z

50

Designing Axial Flow Fan for Flow and Noise  

E-Print Network (OSTI)

A comprehensive finite element methodology is developed to predict the compressible flow performance of a non-symmetric 7-blade axial flow fan, and to quantify the source strength and sound pressure levels at any location in the system. The acoustic and flow performances of the fan are predicted simultaneously using a computational aero-acoustic technique combining transient flow analysis and noise propagation. The calculated sound power levels compare favorably with the measured sound power data per AMCA 300-96 code.

Subrata Roy; Phillip Cho; Fred Périé; International Off-highway

1999-01-01T23:59:59.000Z

51

Examining transmission power in minimum capacity underwater acoustic networks  

E-Print Network (OSTI)

This paper explores the prospect of reducing the transmission power required to operate links within an underwater acoustic network by minimizing the total capacity of the network while maintaining certain data flow ...

Stanchak, Kathryn E

2010-01-01T23:59:59.000Z

52

Acoustic Microscopy Applications*  

Science Conference Proceedings (OSTI)

Figure: ...Fig. 17 A portion of the 160 mm 2 (0.25 in. 2 ) area of an alumina ceramic disk scanned by an acoustic microscope

53

Acoustics by additive manufacturing.  

E-Print Network (OSTI)

??This study focuses on exploring the merging field of additive manufacturing and acoustics and introduces a new type of sound absorber which is regulating performance… (more)

Setaki, F.

2012-01-01T23:59:59.000Z

54

Displaced electrode process for welding  

DOE Patents (OSTI)

A method is described for the butt-welding of a relatively heavy mass to a relatively small mass such as a thin-wall tube. In butt-welding heat is normally applied at the joint between the two pieces which are butt-welded together. The application of heat at the joint results in overheating the tube which causes thinning of the tube walls and porosity in the tube material. This is eliminated by displacing the welding electrode away from the seam toward the heavier mass so that heat is applied to the heavy mass and not at the butt seam. Examples of the parameters used in welding fuel rods are given. The cladding and end plugs were made of Zircalloy. The electrode used was of 2 percent thoriated tungsten. (auth)

Heichel, L.J.

1975-08-26T23:59:59.000Z

55

Evaluation of two-phase relative permeability and capillary pressure relations for unstable displacements in a pore network  

Science Conference Proceedings (OSTI)

A series of displacement experiments was conducted using five wetting-nonwetting immiscible fluid pairs in a homogenous and uniform pore network. The micromodel was initially saturated with either polyethylene glycol 200 (PEG) or water as a wetting fluid, which was subsequently displaced by a nonwetting fluid (dodecane, hexadecane, or mineral oil) at different flow rates. The experiments were designed to allow determinations of nonwetting fluid relative permeabilities ( ), fluid saturations ( ), and capillary pressure heads ( ). In the displacements, nonwetting fluid saturations increased with increasing flow rates for all five fluid pairs, and viscous fingering, capillary fingering, and stable displacement were observed. Viscous fingering occurred when PEG was displaced by either dodecane or hexadecane. For the water displacements, capillary fingers were observed at low capillary numbers. Due to unstable fingering phenomena, values for the PEG displacements were smaller than for the water displacements. A fitting exercise using the Brooks-Corey (1964) relationship showed that the fitted entry pressure heads are reasonably close to the computed entry pressure head. The fitted pore geometry factor, ?? values for the displacements are considerably lower than what is expected for displacements in homogeneous, highly uniform, porous systems, demonstrating the impact of unstable displacement on the apparent value of ?. It was shown that a continuum-based multiphase model could be used to predict the average behavior for wetting fluid drainage in a pore network as long as independently fitted - and - relations are used. The use of a coupled approach through the Brooks-Corey pore geometry factor underpredicts observed values.

Dehoff, Karl J.; Oostrom, Martinus; Zhang, Changyong; Grate, Jay W.

2012-10-29T23:59:59.000Z

56

Displacement speeds in turbulent premixed flame simulations  

SciTech Connect

The theory of turbulent premixed flames is based on acharacterization of the flame as a discontinuous surface propagatingthrough the fluid. The displacement speed, defined as the local speed ofthe flame front normal to itself, relative to the unburned fluid,provides one characterization of the burning velocity. In this paper, weintroduce a geometric approach to computing displacement speed anddiscuss the efficacy of the displacement speed for characterizing aturbulent flame.

Day, Marcus S.; Shepherd, Ian G.; Bell, J.; Grcar, Joseph F.; Lijewski, Michael J.

2007-07-01T23:59:59.000Z

57

Walker Branch Throughfall Displacement Experiment Data Report...  

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

M. E. Wolfe, and E. G. O'Neill. 2001. Walker Branch Throughfall Displacement Experiment Data Report: Site Characterization, System Performance, Weather, Species Composition, and...

58

Coreflood experimental study of steam displacement.  

E-Print Network (OSTI)

??The main objective of this study was to verify experimentally whether or not a Buckley-Leverett shock front exists when steam displaces oil in a porous… (more)

Cerutti, Andres Enrique

2012-01-01T23:59:59.000Z

59

Geothermal: Sponsored by OSTI -- Generalized displacement correlation...  

Office of Scientific and Technical Information (OSTI)

Generalized displacement correlation method for estimating stress intensity factors Geothermal Technologies Legacy Collection HelpFAQ | Site Map | Contact Us | Admin Log On Home...

60

Forced oil-water displacement and spontaneous countercurrent imbibition are the crucial mechanisms of secondary oil  

E-Print Network (OSTI)

Abstract Forced oil-water displacement and spontaneous countercurrent imbibition are the crucial mechanisms of secondary oil recovery. Classical mathematical models of both these unsteady flows are based on the fundamental assumption of local phase equilibrium. Thus, the water and oil flows are locally redistributed

Patzek, Tadeusz W.

Note: This page contains sample records for the topic "acoustics displacement flow" 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

Acoustical heat pumping engine  

DOE Patents (OSTI)

The disclosure is directed to an acoustical heat pumping engine without moving seals. A tubular housing holds a compressible fluid capable of supporting an acoustical standing wave. An acoustical driver is disposed at one end of the housing and the other end is capped. A second thermodynamic medium is disposed in the housing near to but spaced from the capped end. Heat is pumped along the second thermodynamic medium toward the capped end as a consequence both of the pressure oscillation due to the driver and imperfect thermal contact between the fluid and the second thermodynamic medium.

Wheatley, John C. (Los Alamos, NM); Swift, Gregory W. (Los Alamos, NM); Migliori, Albert (Santa Fe, NM)

1983-08-16T23:59:59.000Z

62

Acoustical heat pumping engine  

DOE Patents (OSTI)

The disclosure is directed to an acoustical heat pumping engine without moving seals. A tubular housing holds a compressible fluid capable of supporting an acoustical standing wave. An acoustical driver is disposed at one end of the housing and the other end is capped. A second thermodynamic medium is disposed in the housing near to but spaced from the capped end. Heat is pumped along the second thermodynamic medium toward the capped end as a consequence both of the pressure oscillation due to the driver and imperfect thermal contact between the fluid and the second thermodynamic medium. 2 figs.

Wheatley, J.C.; Swift, G.W.; Migliori, A.

1983-08-16T23:59:59.000Z

63

Displacement Transfer Zone | Open Energy Information  

Open Energy Info (EERE)

Displacement Transfer Zone Displacement Transfer Zone Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Print PDF Displacement Transfer Zone Dictionary.png Displacement Transfer Zone: Displacement transfer zones facilitate the transfer of strain between normal and strike-slip faults. Intersections between strike-slip faults in the Walker Lane and N- to NNE-striking normal faults commonly host geothermal systems, focused along the normal faults proximal to their dilational intersections with nearby strike-slip faults. Other definitions:Wikipedia Reegle Controlling Structures List of controlling structures typically associated with geothermal systems: Major Normal Fault Termination of a Major Normal Fault Stepover or Relay Ramp in Normal Fault Zones Apex or Salient of Normal Fault

64

Ray-tracing Procedural Displacement Shaders  

E-Print Network (OSTI)

Displacement maps and procedural displacement shaders are a widely used approach of specifying geometric detail and increasing the visual complexity of a scene. While it is relatively straightforward to handle displacement shaders in pipeline based rendering systems such as the Reyes-architecture, it is much harder to efficiently integrate displacement-mapped surfaces in ray-tracers. Many commercial ray-tracers tessellate the surface into a multitude of small triangles. This introduces a series of problems such as excessive memory consumption and possibly undetected surface detail. In this paper we describe a novel way of ray-tracing procedural displacement shaders directly, that is, without introducing intermediate geometry. Affine arithmetic is used to compute bounding boxes for the shader over any range in the parameter domain. The method is comparable to the direct ray-tracing of B'ezier surfaces and implicit surfaces using B'ezier clipping and interval methods, respectively. Keyw...

Wolfgang Heidrich; Hans-peter Seidel

1998-01-01T23:59:59.000Z

65

Acoustic energy-driven fluid pump and method  

DOE Patents (OSTI)

Bulk fluid motion is promoted in a gaseous fluid contained within a conduit system provided with a diffuser without the need for a mean pressure differential across the conduit system. The contacting of the gaseous fluid with unsteady energy at a selected frequency and pressure amplitude induces fluid flow through the conical diffuser. The unsteady energy can be provided by pulse combustors, thermoacoustic engines, or acoustic energy generators such as acoustic speakers.

Janus, Michael C.; Richards, George A.; Robey, Edward H.

1997-12-01T23:59:59.000Z

66

Compact acoustic refrigerator  

DOE Patents (OSTI)

This invention is comprised of a compact acoustic refrigeration system that actively cools components, e.g., electrical circuits, in a borehole environment. An acoustic engine includes first thermodynamic elements for generating a standing acoustic wave in a selected medium. An acoustic refrigerator includes second thermodynamic elements located in the standing wave for generating a relatively cold temperature at a first end of the second thermodynamic elements and a relatively hot temperature at a second end of the second thermodynamic elements. A resonator volume cooperates with the first and second thermodynamic elements to support the standing wave. To accommodate the high heat fluxes required for heat transfer to/from the first and second thermodynamic elements, first heat pipes transfer heat from the heat load to the second thermodynamic elements and second heat pipes transfer heat from first and second thermodynamic elements to the borehole environment.

Bennett, G.A.

1991-12-31T23:59:59.000Z

67

Compact acoustic refrigerator  

DOE Patents (OSTI)

A compact acoustic refrigeration system actively cools components, e.g., electrical circuits, in a borehole environment. An acoustic engine includes first thermodynamic elements for generating a standing acoustic wave in a selected medium. An acoustic refrigerator includes second thermodynamic elements located in the standing wave for generating a relatively cold temperature at a first end of the second thermodynamic elements and a relatively hot temperature at a second end of the second thermodynamic elements. A resonator volume cooperates with the first and second thermodynamic elements to support the standing wave. To accommodate the high heat fluxes required for heat transfer to/from the first and second thermodynamic elements, first heat pipes transfer heat from the heat load to the second thermodynamic elements and second heat pipes transfer heat from first and second thermodynamic elements to the borehole environment. 18 figs.

Bennett, G.A.

1992-11-24T23:59:59.000Z

68

Space, time and acoustics  

E-Print Network (OSTI)

This thesis describes the development of new concepts in acoustical analysis from their inception to implementation as a computer design tool. Research is focused on a computer program which aids the designer to visually ...

Thompson, Philip R. Z. (Philip Reed Zane)

1988-01-01T23:59:59.000Z

69

Atmospheric Acoustic Minisounder  

Science Conference Proceedings (OSTI)

An improved version of a monostatic acoustic minisounder for the investigation of the structure and dynamics of the lower boundary layer, operating at high frequencies and equipped with a specially designed micro-antenna and advanced electronic ...

D. N. Asimakopoulos; C. G. Helmis; G. J. Stephanou

1987-06-01T23:59:59.000Z

70

Compact acoustic refrigerator  

DOE Patents (OSTI)

A compact acoustic refrigeration system actively cools components, e.g., electrical circuits (22), in a borehole environment. An acoustic engine (12, 14) includes first thermodynamic elements (12) for generating a standing acoustic wave in a selected medium. An acoustic refrigerator (16, 26, 28) includes second thermodynamic elements (16) located in the standing wave for generating a relatively cold temperature at a first end of the second thermodynamic elements (16) and a relatively hot temperature at a second end of the second thermodynamic elements (16). A resonator volume (18) cooperates with the first and second thermodynamic elements (12, 16) to support the standing wave. To accommodate the high heat fluxes required for heat transfer to/from the first and second thermodynamic elements (12, 16), first heat pipes (24, 26) transfer heat from the heat load (22) to the second thermodynamic elements (16) and second heat pipes (28, 32) transfer heat from first and second thermodynamic elements (12, 16) to the borehole environment.

Bennett, Gloria A. (Los Alamos, NM)

1992-01-01T23:59:59.000Z

71

Spacetime transformation acoustics  

E-Print Network (OSTI)

A recently proposed analogue transformation method has allowed the extension of transformation acoustics to general spacetime transformations. We analyze here in detail the differences between this new analogue transformation acoustics (ATA) method and the standard one (STA). We show explicitly that STA is not suitable for transformations that mix space and time. ATA takes as starting point the acoustic equation for the velocity potential, instead of that for the pressure as in STA. This velocity-potential equation by itself already allows for some transformations mixing space and time, but not all of them. We explicitly obtain the entire set of transformations that do not leave its form invariant. It is in these cases that ATA shows its true potential, allowing for building a transformation acoustics method that enables the full range of spacetime transformations. We provide an example of an important transformation which cannot be achieved with STA. Using this transformation, we design and simulate an acous...

García-Meca, C; Barceló, C; Jannes, G; Sánchez-Dehesa, J; Martínez, A

2013-01-01T23:59:59.000Z

72

Automatic acoustic guitar tuner  

E-Print Network (OSTI)

Acoustic guitar musicians tune their instruments by using a conventional tuner. Individuals pluck the string and the conventional tuner indicates whether the note is sharp or flat. The musician then has to wind the string ...

Bocanegra, Alfredo

2005-01-01T23:59:59.000Z

73

Acoustic imaging system  

DOE Patents (OSTI)

An acoustic imaging system for displaying an object viewed by a moving array of transducers as the array is pivoted about a fixed point within a given plane. A plurality of transducers are fixedly positioned and equally spaced within a laterally extending array and operatively directed to transmit and receive acoustic signals along substantially parallel transmission paths. The transducers are sequentially activated along the array to transmit and receive acoustic signals according to a preestablished sequence. Means are provided for generating output voltages for each reception of an acoustic signal, corresponding to the coordinate position of the object viewed as the array is pivoted. Receptions from each of the transducers are presented on the same display at coordinates corresponding to the actual position of the object viewed to form a plane view of the object scanned.

Smith, Richard W. (Richland, WA)

1979-01-01T23:59:59.000Z

74

Keyboard acoustic emanations revisited  

Science Conference Proceedings (OSTI)

We examine the problem of keyboard acoustic emanations. We present a novel attack taking as input a 10-minute sound recording of a user typing English text using a keyboard, and then recovering up to 96% of typed characters. There is no need for a labeled ... Keywords: HMM, acoustic emanations, cepstrum, computer security, electronic eavesdropping, hidden Markov models, human factors, keyboards, learning theory, privacy, signal analysis

Li Zhuang; Feng Zhou; J. D. Tygar

2005-11-01T23:59:59.000Z

75

Keyboard acoustic emanations revisited  

Science Conference Proceedings (OSTI)

We examine the problem of keyboard acoustic emanations. We present a novel attack taking as input a 10-minute sound recording of a user typing English text using a keyboard and recovering up to 96% of typed characters. There is no need for training ... Keywords: Computer security, HMM, acoustic manations, cepstrum, electronic eavesdropping, hidden markov models, human factors, keyboards, learning theory, privacy, signal analysis

Li Zhuang; Feng Zhou; J. D. Tygar

2009-10-01T23:59:59.000Z

76

Methods And Apparatus For Acoustic Fiber Fractionation  

DOE Patents (OSTI)

Methods and apparatus for acoustic fiber fractionation using a plane ultrasonic wave field interacting with water suspended fibers circulating in a channel flow using acoustic radiation forces to separate fibers into two or more fractions based on fiber radius, with applications of the separation concept in the pulp and paper industry. The continuous process relies on the use of a wall-mounted, rectangular cross-section piezoelectric ceramic transducer to selectively deflect flowing fibers as they penetrate the ultrasonic field. The described embodiment uses a transducer frequency of approximately 150 kHz. Depending upon the amount of dissolved gas in water, separation is obtained using a standing or a traveling wave field.

Brodeur, Pierre (Smyrna, GA)

1999-11-09T23:59:59.000Z

77

Acoustic ranging technique with application to assessment of low-frequency acoustic noise of wind turbines  

DOE Green Energy (OSTI)

Impulsive low-frequency noise from wind turbines can cause annoyance particularly when a residential structure is involved. Such noise is typically generated in some spatially restricted region of a turbine rotor swept area. Low-frequency impulsive noise of the MOD-1 turbine was generated when the rotor blades passed downwind of the tower legs encountering the complex unsteady flows there. An acoustic ranging technique that aids assessment of the degree of concentration of acoustic generation within the turbine swept area and which determines the time-average spatial source region of such concentration is described. Practical applications and limitations of the process are discussed.

Hemphill, R.

1983-05-01T23:59:59.000Z

78

Scale model studies of displacement ventilation  

E-Print Network (OSTI)

Displacement ventilation is an air conditioning method that provides conditioned air to indoor environments with the goal to improve air quality while reducing energy consumption. This study investigates the performance ...

Okutan, Galip Mehmet

1995-01-01T23:59:59.000Z

79

Parallel Displacement Decomposition Solvers for Elasticity Problems  

Science Conference Proceedings (OSTI)

This article describes the displacement decomposition and its benefits for the parallelization of the preconditioned conjugate gradient method for finite element elasticity problems. It deals with both the fixed and variable preconditioning based on ...

Radim Blaheta; Ondrej Jakl; Jiri Stary

2001-09-01T23:59:59.000Z

80

Liquid CO2 Displacement of Water in a Dual-Permeability Pore Network Micromodel  

Science Conference Proceedings (OSTI)

Permeability contrasts exist in multilayer geological formations under consideration for carbon sequestration. To improve our understanding of heterogeneous pore-scale displacements, liquid CO2 (LCO2) - water displacement was evaluated in a pore network micromodel with two distinct permeability zones. Due to the low viscosity ratio (logM = -1.1), unstable displacement occurred at all injection rates over two orders of magnitude. LCO2 displaced water only in the high permeability zone at low injection rates with the mechanism shifting from capillary fingering to viscous fingering with increasing flow rate. At high injection rates, LCO2 displaced water in the low permeability zone with capillary fingering as the dominant mechanism. LCO2 saturation (SLCO2) as a function of injection rate was quantified using fluorescent microscopy. In all experiments, more than 50% of LCO2 resided in the active flowpaths, and this fraction increased as displacement transitioned from capillary to viscous fingering. A continuum-scale two-phase flow model with independently determined fluid and hydraulic parameters was used to predict SLCO2 in the dual-permeability field. Agreement with the micromodel experiments was obtained for low injection rates. However, the numerical model does not account for the unstable viscous fingering processes observed experimentally at higher rates and hence overestimated SLCO2.

Zhang, Changyong; Oostrom, Martinus; Grate, Jay W.; Wietsma, Thomas W.; Warner, Marvin G.

2011-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "acoustics displacement flow" 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

Tsunami mortality and displacement in Aceh province, Indonesia  

E-Print Network (OSTI)

Tsunami mortality and displacement in Aceh province, Indonesia Abdur Rofi, MA Mercy Corps Indonesia, Indonesia, Shannon Doocy, PhD Research Associate, Johns Hopkins Bloomberg School of Public Health, US. Keywords: displacement, internally displaced persons (IDPs), Indonesia, mortality, tsunami Introduction

Scharfstein, Daniel

82

A STOCHASTIC METHOD FOR MODELING FLUID DISPLACEMENT IN PETROLEUM RESERVOIRS  

E-Print Network (OSTI)

FLUID DISPLACEMENT IN PETROLEUM RESERVOIRS C. Anderson andFLUID DISPLACEMENT IN PETROLEUM RESERVOIRS C. Anderson andachieve optimal recovery of petroleum from a reservoir, it

Anderson, C.

2011-01-01T23:59:59.000Z

83

Acoustic Survey of a 3/8-Scale Automotive Wind Tunnel  

Science Conference Proceedings (OSTI)

An acoustic survey that consists of insertion loss and flow noise measurements was conducted at key locations around the circuit of a 3/8-scale automotive acoustic wind tunnel. Descriptions of the test, the instrumentation, and the wind tunnel facility ...

Jr Earl R. Booth; Romberg Gary; Hansen Larry; Lutz Ron

1996-10-01T23:59:59.000Z

84

Definition: Displacement Transfer Zone | Open Energy Information  

Open Energy Info (EERE)

Definition Definition Edit with form History Facebook icon Twitter icon » Definition: Displacement Transfer Zone Jump to: navigation, search Dictionary.png Displacement Transfer Zone Displacement transfer zones facilitate the transfer of strain between normal and strike-slip faults. Intersections between strike-slip faults in the Walker Lane and N- to NNE-striking normal faults commonly host geothermal systems, focused along the normal faults proximal to their dilational intersections with nearby strike-slip faults.[2] View on Wikipedia Wikipedia Definition References ↑ James E. Faulds,Nicholas H. Hinz,Mark F. Coolbaugh,Patricia H. Cashman,Christopher Kratt,Gregory Dering,Joel Edwards,Brett Mayhew,Holly McLachlan. 2011. Assessment of Favorable Structural Settings of Geothermal

85

Acoustic Imaging Suite  

INL’s acoustic imaging technology improves methods of capturing moving images of a specified object by using a photorefractive effect to produce a full-field image of the object without using a probe to perform a full scan of the object. INL ...

86

Multipurpose Acoustic Sensor for Downhole Fluid Monitoring  

Science Conference Proceedings (OSTI)

The projects objectives and purpose are to: (1) development a multipurpose acoustic sensor for downhole fluid monitoring in Enhanced Geothermal Systems (EGS) reservoirs over typical ranges of pressures and temperatures and demonstrate its capabilities and performance for different EGS systems; (2) determine in real-time and in a single sensor package several parameters - temperature, pressure, fluid flow and fluid properties; (3) needed in nearly every phase of an EGS project, including Testing of Injection and Production Wells, Reservoir Validation, Inter-well Connectivity, Reservoir Scale Up and Reservoir Sustainability. (4) Current sensors are limited to operating at lower temperatures, but the need is for logging at high temperatures. The present project deals with the development of a novel acoustic-based sensor that can work at temperatures up to 374 C, in inhospitable environments.

Pantea, Cristian [Los Alamos National Laboratory

2012-05-04T23:59:59.000Z

87

Development of a geothermal acoustic borehole televiewer  

DOE Green Energy (OSTI)

Most geothermal wells are drilled in hard rock formations where fluid flow is through systems of open fractures. Productivity of these wells is usually determined by the extent of intersection of the wellbore with the fracture system. A need exists for fracture mapping methods and tools which can operate in a geothermal environment. In less hostile environments, the acoustic borehole televiewer has been shown to be a useful tool for determining location, orientation, and characterization of fractures as they intersect the borehole and for general wellbore and casing inspection. The development conducted at Sandia National Laboratories to adapt an acoustic borehole televiewer for operation in a geothermal environment is described. The modified instrument has been successfully tested at temperatures as high as 280/sup 0/C and pressures up to 5000 psi, and used successfully to map fractures and casing damage in geothermal wells.

Heard, F.E.; Bauman, T.J.

1983-08-01T23:59:59.000Z

88

Displacement of Different Gases on the Mechanism of Methane and its Experimental Research  

Science Conference Proceedings (OSTI)

The paper is research how to improve the exploitation of coal bed methane rate, we discussed the flooding in the coal bed methane gas, CO2 gas with N2 gas and the effect of displacement, respectively, and summed up: With the injection of different gases ... Keywords: CBM, N2 and CO2 gas, Flow characteristics, Mechanism

E. Dong; Long Guan

2012-05-01T23:59:59.000Z

89

Acoustic sand detector for fluid flowstreams  

DOE Patents (OSTI)

The particle volume and particle mass production rate of particulate solids entrained in fluid flowstreams such as formation sand or fracture proppant entrained in oil and gas production flowstreams is determined by a system having a metal probe interposed in a flow conduit for transmitting acoustic emissions created by particles impacting the probe to a sensor and signal processing circuit which produces discrete signals related to the impact of each of the particles striking the probe. The volume or mass flow rate of particulates is determined from making an initial particle size distribution and particle energy distribution and comparing the initial energy distribution and/or the initial size distribution with values related to the impact energies of a predetermined number of recorded impacts. The comparison is also used to recalibrate the system to compensate for changes in flow velocity.

Beattie, Alan G. (Corrales, NM); Bohon, W. Mark (Frisco, TX)

1993-01-01T23:59:59.000Z

90

Acoustic paramagnetic logging tool  

DOE Patents (OSTI)

New methods and apparatus are disclosed which allow measurement of the presence of oil and water in geological formations using a new physical effect called the Acoustic Paramagnetic Logging Effect (APLE). The presence of petroleum in formation causes a slight increase in the earth's magnetic field in the vicinity of the reservoir. This is the phenomena of paramagnetism. Application of an acoustic source to a geological formation at the Larmor frequency of the nucleons present causes the paramagnetism of the formation to disappear. This results in a decrease in the earth3 s magnetic field in the vicinity of the oil bearing formation. Repetitively frequency sweeping the acoustic source through the Larmor frequency of the nucleons present (approx. 2 kHz) causes an amplitude modulation of the earth's magnetic field which is a consequence of the APLE. The amplitude modulation of the earth's magnetic field is measured with an induction coil gradiometer and provides a direct measure of the amount of oil and water in the excitation zone of the formation . The phase of the signal is used to infer the longitudinal relaxation times of the fluids present, which results in the ability in general to separate oil and water and to measure the viscosity of the oil present. Such measurements may be preformed in open boreholes and in cased well bores.

Vail, III, William B. (Bothell, WA)

1988-01-01T23:59:59.000Z

91

Cylindrical Acoustic Levitator/Concentrator  

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

Cylindrical Acoustic Levitator/Concentrator Cylindrical Acoustic Levitator/Concentrator Cylindrical Acoustic Levitator/Concentrator A low-power, inexpensive acoustic apparatus for levitation and/or concentration of aerosols and small liquid/solid samples having particulates up to several millimeters in diameter in air or other fluids is described. Available for thumbnail of Feynman Center (505) 665-9090 Email Cylindrical Acoustic Levitator/Concentrator A low-power, inexpensive acoustic apparatus for levitation and/or concentration of aerosols and small liquid/solid samples having particulates up to several millimeters in diameter in air or other fluids is described. It is constructed from a commercially available, hollow cylindrical piezoelectric crystal which has been modified to tune the resonance frequency of the breathing mode resonance of the crystal to that

92

Acoustic Enhancement of Photodetecting Devices  

for suspect materials, to advanced weapons guidance. Using a high Q acoustic resonator, the invention increases the sensitivity of the detectors by an order of

93

Cylindrical Acoustic Levitator/Concentrator  

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

A low-power, inexpensive acoustic apparatus for levitation andor concentration of aerosols and small liquidsolid samples having particulates up to several millimeters in...

94

THE RANDOM CHOICE METHOD FOR CALCULATING FLUID DISPLACEMENT IN A POROUS MEDIUM  

E-Print Network (OSTI)

Abstract Multiphase fluid displacement in a porous mediumIntroduction Multiphase fluid displacement in a porous

Albright, N.

2011-01-01T23:59:59.000Z

95

Acoustic Character Of Hydraulic Fractures In Granite  

E-Print Network (OSTI)

Hydraulic fractures in homogeneous granitic rocks were logged with conventional acoustic-transit-time, acoustic-waveform, and acoustic-televiewer logging systems. Fractured intervals ranged in depth from 45 to 570m. and ...

Paillet, Frederick I.

1983-01-01T23:59:59.000Z

96

Building Energy Software Tools Directory: Acoustics Program  

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

Acoustics Program Developed to help designers accurately model the sound level reaching building tenant's ears, the Trane Acoustics Program (TAP) "projects" equipment sound power...

97

Continental Slope Flow Northeast of Taiwan  

Science Conference Proceedings (OSTI)

Hydrographic observations and current measurements with a Shipboard Acoustic Doppler Current Profiler over the continental shelf–slope junction northeast of Taiwan during 10–17 August 1994 allow the construction of the mesoscale flow pattern ...

T. Y. Tang; Y. Hsueh; Y. J. Yang; J. C. Ma

1999-06-01T23:59:59.000Z

98

The electron geodesic acoustic mode  

Science Conference Proceedings (OSTI)

In this report, a novel new mode, named the electron geodesic acoustic mode, is presented. This mode can occur in toroidal plasmas like the conventional geodesic acoustic mode (GAM). The frequency of this new mode is much larger than that of the conventional GAM by a factor equal to the square root of the ion to electron mass ratio.

Chakrabarti, N. [Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Calcutta 700 064 (India); Guzdar, P. N. [Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742 (United States); Kaw, P. K. [Institute for Plasma Research Bhat, Gandhinagar 382428 (India)

2012-09-15T23:59:59.000Z

99

Acoustics sound systems for baseball  

Science Conference Proceedings (OSTI)

Acoustic considerations impact the design of sound systems for baseball stadiums in several important ways. Intrusion by the sound system into adjacent residential communities must often be minimized. Excess attenuation greatly increases the required high frequency component of acoustic power for sound travelling long distances

2001-01-01T23:59:59.000Z

100

Opto-acoustic thrombolysis  

DOE Patents (OSTI)

This invention is a catheter-based device for generating an ultrasound excitation in biological tissue. Pulsed laser light is guided through an optical fiber to provide the energy for producing the acoustic vibrations. The optical energy is deposited in a water-based absorbing fluid, e.g. saline, thrombolytic agent, blood or thrombus, and generates an acoustic impulse in the fluid through thermoelastic and/or thermodynamic mechanisms. By pulsing the laser at a repetition rate (which may vary from 10 Hz to 100 kHz) an ultrasonic radiation field can be established locally in the medium. This method of producing ultrasonic vibrations can be used in vivo for the treatment of stroke-related conditions in humans, particularly for dissolving thrombus or treating vasospasm. The catheter can also incorporate thrombolytic drug treatments as an adjunct therapy and it can be operated in conjunction with ultrasonic detection equipment for imaging and feedback control and with optical sensors for characterization of thrombus type and consistency.

Celliers, Peter (Berkeley, CA); Da Silva, Luiz (Danville, CA); Glinsky, Michael (Livermore, CA); London, Richard (Orinda, CA); Maitland, Duncan (Livermore, CA); Matthews, Dennis (Moss Beach, CA); Fitch, Pat (Livermore, CA)

2000-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "acoustics displacement flow" 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

Opto-acoustic thrombolysis  

Science Conference Proceedings (OSTI)

This invention is a catheter-based device for generating an ultrasound excitation in biological tissue. Pulsed laser light is guided through an optical fiber to provide the energy for producing the acoustic vibrations. The optical energy is deposited in a water-based absorbing fluid, e.g. saline, thrombolytic agent, blood or thrombus, and generates an acoustic impulse in the fluid through thermoelastic and/or thermodynamic mechanisms. By pulsing the laser at a repetition rate (which may vary from 10 Hz to 100 kHz) an ultrasonic radiation field can be established locally in the medium. This method of producing ultrasonic vibrations can be used in vivo for the treatment of stroke-related conditions in humans, particularly for dissolving thrombus or treating vasospasm. The catheter can also incorporate thrombolytic drug treatments as an adjunct therapy and it can be operated in conjunction with ultrasonic detection equipment for imaging and feedback control and with optical sensors for characterization of thrombus type and consistency.

Celliers, P.; Silva, L. Da; Glinsky, M.; London, R.; Maitland, D.; Matthews, D.; Fitch, P.

2000-02-08T23:59:59.000Z

102

Acoustic Inspection Devices: Detecting the Undetectable  

Acoustic Inspection Devices: Detecting the Undetectable Emerging homeland security threats and increasingly sophisticated adversaries have heightened ...

103

Acoustical heat-pumping engine  

DOE Patents (OSTI)

The disclosure is directed to an acoustical heat pumping engine without moving seals. A tubular housing holds a compressible fluid capable of supporting an acoustical standing wave. An acoustical driver is disposed at one end of the housing and the other end is capped. A second thermodynamic medium is disposed in the housing near to but spaced from the capped end. Heat is pumped along the second thermodynamic medium toward the capped end as a consequence both of the pressure oscillation due to the driver and imperfect thermal contact between the fluid and the second thermodynamic medium.

Wheatley, J.C.; Swift, G.W.; Migliori, A.

1981-08-14T23:59:59.000Z

104

ACOUSTIC DETECTING AND LOCATING GAS PIPE LINE INFRINGEMENT  

Science Conference Proceedings (OSTI)

The extensive network of high-pressure natural gas transmission pipelines covering the United States provides an important infrastructure for our energy independence. Early detection of pipeline leaks and infringements by construction equipment, resulting in corrosion fractures, presents an important aspect of our national security policy. The National Energy Technology Laboratory Strategic Center for Natural Gas (SCVG) is and has been funding research on various applicable techniques. The WVU research team has focused on monitoring pipeline background acoustic signals generated and transmitted by gas flowing through the gas inside the pipeline. In case of a pipeline infringement, any mechanical impact on the pipe wall, or escape of high-pressure gas, generates acoustic signals traveling both up and down stream through the gas. Sudden changes in flow noise are detectable with a Portable Acoustic Monitoring Package (PAMP), developed under this contract. It incorporates a pressure compensating microphone and a signal- recording device. Direct access to the gas inside the line is obtained by mounting such a PAMP, with a 1/2 inch NPT connection, to a pipeline pressure port found near most shut-off valves. An FFT of the recorded signal subtracted by that of the background noise recorded one-second earlier appears to sufficiently isolate the infringement signal to allow source interpretation. Using cell phones for data downloading might allow a network of such 1000-psi rated PAMP's to acoustically monitor a pipeline system and be trained by neural network software to positively identify and locate any pipeline infringement.

John L. Loth; Gary J. Morris; George M. Palmer; Richard Guiler; Patrick Browning

2004-12-01T23:59:59.000Z

105

ACOUSTIC DETECTING AND LOCATING GAS PIPE LINE INFRINGEMENT  

Science Conference Proceedings (OSTI)

The extensive network of high-pressure natural gas transmission pipelines covering the United States provides an important infrastructure for our energy independence. Early detection of pipeline leaks and infringements by construction equipment, resulting in corrosion fractures, presents an important aspect of our national security policy. The National Energy Technology Laboratory Strategic Center for Natural Gas (SCVG) is and has been funding research on various applicable techniques. The WVU research team has focused on monitoring pipeline background acoustic signals generated and transmitted by gas flowing through the gas inside the pipeline. In case of a pipeline infringement, any mechanical impact on the pipe wall, or escape of high-pressure gas, generates acoustic signals traveling both up and down stream through the gas. Sudden changes in flow noise are detectable with a Portable Acoustic Monitoring Package (PAMP), developed under this contract. It incorporates a pressure compensating microphone and a signal- recording device. Direct access to the gas inside the line is obtained by mounting such a PAMP, with a 1/2 inch NPT connection, to a pipeline pressure port found near most shut-off valves. An FFT of the recorded signal subtracted by that of the background noise recorded one-second earlier appears to sufficiently isolate the infringement signal to allow source interpretation. Using cell phones for data downloading might allow a network of such 1000-psi rated PAMP's to acoustically monitor a pipeline system and be trained by neural network software to positively identify and locate any pipeline infringement.

John L. Loth; Gary J. Morris; George M. Palmer; Richard Guiler; Patrick Browning

2004-10-31T23:59:59.000Z

106

Hybrid staging of a Lysholm positive displacement engine with two Westinghouse two stage impulse Curtis turbines  

SciTech Connect

The University of California at Berkeley has tested and modeled satisfactorly a hybrid staged Lysholm engine (positive displacement) with a two stage Curtis wheel turbine. The system operates in a stable manner over its operating range (0/1-3/1 water ratio, 120 psia input). Proposals are made for controlling interstage pressure with a partial admission turbine and volume expansion to control mass flow and pressure ratio for the Lysholm engine.

Parker, D.A.

1982-06-01T23:59:59.000Z

107

Optical inverse-square displacement sensor  

DOE Patents (OSTI)

This invention comprises an optical displacement sensor that uses the inverse-square attenuation of light reflected from a diffused surface to calculate the distance from the sensor to the reflecting surface. Light emerging from an optical fiber or the like is directed onto the surface whose distance is to be measured. The intensity I of reflected light is angle dependent, but within a sufficiently small solid angle it falls off as the inverse square of the distance from the surface. At least a pair of optical detectors are mounted to detect the reflected light within the small solid angle, their ends being at different distances R and R + [Delta]R from the surface. The distance R can then be found in terms of the ratio of the intensity measurements and the separation length as given in an equation. 10 figs.

Howe, R.D.; Kychakoff, G.

1989-09-12T23:59:59.000Z

108

Optical inverse-square displacement sensor  

DOE Patents (OSTI)

This invention comprises an optical displacement sensor that uses the inverse-square attenuation of light reflected from a diffused surface to calculate the distance from the sensor to the reflecting surface. Light emerging from an optical fiber or the like is directed onto the surface whose distance is to be measured. The intensity I of reflected light is angle dependent, but within a sufficiently small solid angle it falls off as the inverse square of the distance from the surface. At least a pair of optical detectors are mounted to detect the reflected light within the small solid angle, their ends being at different distances R and R+.DELTA.R from the surface. The distance R can then be found in terms of the ratio of the intensity measurements and the separation length as ##EQU1##

Howe, Robert D. (San Mateo County, CA); Kychakoff, George (King County, WA)

1989-01-01T23:59:59.000Z

109

Acoustic Backscatter from Turbulent Microstructure  

Science Conference Proceedings (OSTI)

Acoustic backscatter has produced spectacular images of internal ocean processes for nearly two decades, but interpretation of the images remains ambiguous because several mechanisms can generate measurable backscatter. The authors present what ...

Harvey E. Seim; Michael C. Gregg; R. T. Miyamoto

1995-04-01T23:59:59.000Z

110

Forest Products: Acoustic Humidity Sensor  

SciTech Connect

The new acoustic sensor, designed as a humidity-control system for the paper and textile industries, can both eliminate overdrying and improve product quality by measuring humidity precisely. This new fact sheet explains how the process works.

Poole, L.; Recca, L.

1999-01-29T23:59:59.000Z

111

Acoustically Enhanced Boiling Heat Transfer  

E-Print Network (OSTI)

An acoustic field is used to increase the critical heat flux (CHF) of a flat-boiling-heat-transfer surface. The increase is a result of the acoustic effects on the vapor bubbles. Experiments are performed to explore the effects of an acoustic field on vapor bubbles in the vicinity of a rigid-heated wall. Work includes the construction of a novel heater used to produce a single vapor bubble of a prescribed size and at a prescribed location on a flatboiling surface for better study of an individual vapor bubble's reaction to the acoustic field. Work also includes application of the results from the single-bubble heater to a calibrated-copper heater used for quantifying the improvements in CHF.

Z. W. Douglas; M. K. Smith; A. Glezer

2008-01-07T23:59:59.000Z

112

Acoustic Characterization of Mesoscale Objects  

SciTech Connect

This report describes the science and engineering performed to provide state-of-the-art acoustic capabilities for nondestructively characterizing mesoscale (millimeter-sized) objects--allowing micrometer resolution over the objects entire volume. Materials and structures used in mesoscale objects necessitate the use of (1) GHz acoustic frequencies and (2) non-contacting laser generation and detection of acoustic waves. This effort demonstrated that acoustic methods at gigahertz frequencies have the necessary penetration depth and spatial resolution to effectively detect density discontinuities, gaps, and delaminations. A prototype laser-based ultrasonic system was designed and built. The system uses a micro-chip laser for excitation of broadband ultrasonic waves with frequency components reaching 1.0 GHz, and a path-stabilized Michelson interferometer for detection. The proof-of-concept for mesoscale characterization is demonstrated by imaging a micro-fabricated etched pattern in a 70 {micro}m thick silicon wafer.

Chinn, D; Huber, R; Chambers, D; Cole, G; Balogun, O; Spicer, J; Murray, T

2007-03-13T23:59:59.000Z

113

Employing the complete acoustical palette in teleconferencing design  

Science Conference Proceedings (OSTI)

The prevailing architectural acoustics approach in teleconferencing is “Deader is better” or “No acoustics is better than bad acoustics.” In some situations

Peter D'Antonio

1989-01-01T23:59:59.000Z

114

Iterative equalization and decoding applied to underwater acoustic communication  

E-Print Network (OSTI)

1.1 Shallow Underwater Acoustic Channels . . . . . . . .and Decoding Approach for Underwater Acoustic Commu-Equalization and Decoding of Underwater Acoustic Using Array

Sifferlen, James F.

2008-01-01T23:59:59.000Z

115

Formation flow channel blocking  

SciTech Connect

A method is claimed for selectively blocking high permeability flow channels in an underground hydrocarbon material bearing formation having flow channels of high permeability and having flow channels of lesser permeability. The method includes the following steps: introducing a blocking material fluid comprising a blocking material in a carrier into the flow channels through an injection well in communication with the formation; introducing a buffer fluid into the formation through the injection well for the buffer fluid to displace the blocking material fluid away from the injection well; allowing the blocking material to settle in the channels to resist displacement by fluid flowing through the channels; introducing a quantity of an activating fluid into the channels through the injection well at a sufficient rate for the activating fluid to displace the buffer fluid and finger into the high permeability channels to reach the blocking material in the high permeability channels without reaching the blocking material in the low permeability channels, the activating fluid being adapted to activate the blocking material which it reaches to cause blocking of the high permeability channels.

Kalina, A.I.

1982-11-30T23:59:59.000Z

116

Multiphase flow in fractured porous media  

Science Conference Proceedings (OSTI)

The major goal of this research project was to improve the understanding of the gas-oil two-phase flow in fractured porous media. In addition, miscible displacement was studied to evaluate its promise for enhanced recovery.

Firoozabadi, A.

1995-02-01T23:59:59.000Z

117

Flow cytometry aids basic cell biology research and drug discovery  

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

Flow cytometry aids basic cell biology research and drug discovery Flow cytometry aids basic cell biology research and drug discovery Flow cytometry aids basic cell biology research and drug discovery Life Technologies Corporation and LANL have released the Attune® Acoustic Focusing Cytometer, featuring a reduced footprint, reduced consumables, and an affordable price. April 3, 2012 Attune® Acoustic Focusing Cytometer The Attune® Acoustic Focusing Cytometer achieves sample throughput at rates over 10 times faster than other cytometers-up to 1,000 μL per minute. In December 2009, Life Technologies Corporation announced the release of the Attune® Acoustic Focusing Cytometer, a first-of-its-kind cytometer system based on technology developed at Los Alamos National Laboratory (LANL). Examining cells has never been clearer with LANL's use of acoustic waves

118

Gage for measuring displacements in rock samples  

DOE Patents (OSTI)

A gage for measuring diametral displacement within a rock sample for use in a rock mechanics laboratory and in the field, comprises a support ring housing a linear variable differential transformer, a mounting screw, and a leaf spring. The mounting screw is adjustable and defines a first point of contact with the rock sample. The leaf spring has opposite ends fixed to the inner periphery of the mounting ring. An intermediate portion of the leaf spring projecting radially inward from the ring is formed with a dimple defining a second point of contact with the sample. The first and second points of contact are diametrically opposed to each other. The LVDT is mounted in the ring with its axis parallel to the line of measurement and its core rod received in the dimple of the leaf spring. Any change in the length of the line between the first and second support points is directly communicated to the LVDT. The leaf spring is rigid to completely support lateral forces so that the LVDT is free of all load for improved precision.

Holcomb, David J. (Albuquerque, NM); McNamee, Michael J. (Albuquerque, NM)

1986-01-01T23:59:59.000Z

119

Gage for measuring displacements in rock samples  

DOE Patents (OSTI)

A gage for measuring diametral displacement within a rock sample for use in a rock mechanics laboratory and in the field, comprises a support ring housing a linear variable differential transformer (LVDT), a mounting screw, and a leaf spring. The mounting screw is adjustable and defines a first point of contact with the rock sample. The leaf spring has opposite ends fixed to the inner periphery of the mounting ring. An intermediate portion of the leaf spring projecting radially inward from the ring is formed with a dimple defining a second point of contact with the sample. The first and second points of contact are diametrically opposed to each other. The LVDT is mounted in the ring with its axis parallel to the line of measurement and its core rod received in the dimple of the leaf spring. Any change in the length of the line between the first and second support points is directly communicated to the LVDT. The leaf spring is rigid to completely support lateral forces so that the LVDT is free of all load for improved precision.

Holcomb, D.J.; McNamee, M.J.

1985-07-18T23:59:59.000Z

120

Plasma deposited rider rings for hot displacer  

DOE Patents (OSTI)

A hot cylinder for a cryogenic refrigerator having two plasma spray deposited rider rings of a corrosion and abrasion resistant material provided in the rider ring grooves, wherein the rider rings are machined to the desired diameter and width after deposition. The rider rings have gas flow flats machined on their outer surface.

Kroebig, Helmut L. (Rolling Hills, CA)

1976-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "acoustics displacement flow" 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

The Design of Acoustic Radar Baffles  

Science Conference Proceedings (OSTI)

Compact acoustic antenna arrays, commonly used for profiling urban atmospheres, usually require acoustic baffles to minimize reflections from hard objects and to limit the impact of the 2–6-kHz signals on inhabitants. To facilitate optimum ...

C. J. Werkhoven; S. G. Bradley

1997-06-01T23:59:59.000Z

122

Acoustic data transmission through a drill string  

DOE Patents (OSTI)

Acoustical signals are transmitted through a drill string by canceling upward moving acoustical noise and by preconditioning the data in recognition of the comb filter impedance characteristics of the drill string. 5 figs.

Drumheller, D.S.

1988-04-21T23:59:59.000Z

123

Exact distribution of individual displacements in linear probing hashing  

Science Conference Proceedings (OSTI)

This paper studies the distribution of individual displacements for the standard and the Robin Hood linear probing hashing algorithms. When the a table of size m has n elements, the distribution of the search cost of a random element is ... Keywords: Linear probing, distributional analysis, individual displacements

Alfredo Viola

2005-10-01T23:59:59.000Z

124

Dynamics of quasi-spherical Z-pinch implosions with mass redistribution and displacement modification  

Science Conference Proceedings (OSTI)

Implosions of (quasi-)spherical loads with mass redistribution and displacement modification are investigated numerically. Both methods can theoretically counterbalance the nonuniformity of magnetic pressure along the load surface and realize quasi-spherical Z-pinch implosions. Mass redistribution is feasible for spherical loads with large radius and weight, while the displacement modification is more suitable for light loads, such as those composed of wire arrays. Simulation results suggest that, for mass redistributed spherical loads, wall instabilities induced by polar mass flows will deform the imploding shell. For prolate spherical loads, in which the wall instability cannot develop, the kinetic energy distribution is disturbed at high latitude. These passive behaviors and their possible mitigation methods, such as reshaping the electrode, are investigated numerically in this paper.

Zhang Yang [Institute of Applied Physics and Computational Mathematics, P. O. Box 8009-09, Beijing 100094 (China); Institute of Nuclear Physics and Chemistry, P. O. Box 919-212, Mianyang 621900 (China); Ding Ning; Sun Shunkai; Xue Chuang; Ning Cheng; Xiao Delong; Huang Jun [Institute of Applied Physics and Computational Mathematics, P. O. Box 8009-09, Beijing 100094 (China); Li Zhenghong [Institute of Nuclear Physics and Chemistry, P. O. Box 919-212, Mianyang 621900 (China)

2012-12-15T23:59:59.000Z

125

Acoustic Logs | Open Energy Information  

Open Energy Info (EERE)

Acoustic Logs Acoustic Logs Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Acoustic Logs Details Activities (7) Areas (6) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Downhole Techniques Exploration Sub Group: Well Log Techniques Parent Exploration Technique: Well Log Techniques Information Provided by Technique Lithology: determine porosity of layers Stratigraphic/Structural: map discontinuities to determine their orientation. Hydrological: Thermal: Cost Information Low-End Estimate (USD): 1.00100 centUSD 1.0e-3 kUSD 1.0e-6 MUSD 1.0e-9 TUSD / foot Median Estimate (USD): 4.62462 centUSD 0.00462 kUSD 4.62e-6 MUSD 4.62e-9 TUSD / foot High-End Estimate (USD): 16.001,600 centUSD 0.016 kUSD 1.6e-5 MUSD 1.6e-8 TUSD / foot

126

A compressible flow model with capillary effects  

Science Conference Proceedings (OSTI)

A quasi-conservative formulation for compressible flows with interfaces including both capillary and viscous effects is developed. The model involves: (i) acoustic and convective transport; (ii) surface tension effects introduced as an extension of the ... Keywords: break-up, coalescence, compressibility, conservative formulation, interface capturing, mixture thermodynamics, surface tension, two-phase flows, viscosity

Guillaume Perigaud; Richard Saurel

2005-10-01T23:59:59.000Z

127

Owens Corning Acoustic & Insulation Product Testing ...  

Science Conference Proceedings (OSTI)

... Insulation. [01/T10] ASTM C687 Thermal Resistance of Loose-Fill Building Insulation. Acoustical Testing Services. Accreditation ...

2014-01-03T23:59:59.000Z

128

LANSCE | Lujan Center | Highlights | Local iron displacements and  

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

Local iron displacements and magnetoelastic coupling in a spin-ladder Local iron displacements and magnetoelastic coupling in a spin-ladder compound Hypothesis: Is magnetoelastic coupling in [FeX4]-based materials, an important ingredient in the emergence of superconductivity? Lujan Center: Combined Total Scattering and magnetic structure determination (HIPD-NPDF) The study of local, average and magnetic structure shows the existenceof highly correlated local iron (Fe) displacements in the spin-ladder iron chalcogenide BaFe2Se3. Built of ferromagnetic [Fe4] plaquettes, the magnetic ground state correlates with local displacements of the Fe atoms. Knowledge of these local displacements is essential for properly understanding the electronic structure of these systems. As with the copper oxide superconductors two decades ago, these

129

Acoustic Analysis of Adult Speaker Age  

Science Conference Proceedings (OSTI)

Information about the age of the speaker is always present in speech. It is used as perceptual cues to age by human listeners, and can be measured acoustically and used by automatic age estimators. This chapter offers an introduction to the phonetic ... Keywords: Acoustic analysis, Acoustic correlates, Phonetics, Speaker age

Susanne Schötz

2007-02-01T23:59:59.000Z

130

Acoustic black holes Matt Visser  

E-Print Network (OSTI)

Acoustic black holes Matt Visser Physics Department Washington University Saint Louis USA Ole Miss you develop a number of use- ful connections between supersonic uid ow and black holes in general is the basis underlying a deep and fruitful analogy between the black holes of Einstein gravity and supersonic

Visser, Matt

131

The effect of Coulombic friction on spatial displacement statistics  

E-Print Network (OSTI)

The phenomenon of Coulombic friction enters the stochastic description of dry friction between two solids and the statistic characterization of vibrating granular media. Here we analyze the corresponding Fokker-Planck equation including both velocity and spatial components, exhibiting a formal connection to a quantum mechanical harmonic oscillator in the presence of a delta potential. Numerical solutions for the resulting spatial displacement statistics show a crossover from exponential to Gaussian displacement statistics. We identify a transient intermediate regime that exhibits multiscaling properties arising from the contribution of Coulombic friction. These results are relevant to recent experimental studies of the displacement of colloidal particles along bilayer membrane tubes.

Menzel, Andreas M

2010-01-01T23:59:59.000Z

132

Acoustic and entropy waves in a combustion MHD generator  

DOE Green Energy (OSTI)

Simultaneous, sensitive, high frequency measurements of pressure and temperature fluctuations associated with traveling acoustic and entropy pulses were made in a combustion MHD generator under conditions of applied magnetic field (up to 2.2 Tesla) and moderate current density (up to 1.0 amp per square centimeter). The experimental observations and a closed form analytical description of the magneto-acoustic interaction suggest that non-ideal phenomena, including near electrode phenomena, heat transfer, and possible secondary flows can substantially inhibit wave growth or attenuation caused by magneto-acoustic instabilities. Disturbances in the plasma temperature and pressure were created by the rapid discharge of a capacitor into the moving conducting plasma. Inside the generator, transient measurements were taken at three locations using a probe-tube microphone for pressure measurements, a fiber-optic luminosity probe for relative temperature measurements, and transverse mounted voltage pins to measure local voltage profiles. The pressure waves in a laboratory scale generator are not appreciably affected by MHD phenomena, as anticipated from analytical predictions. Temperature waves are affected by the presence of magnetic field and current, showing small attenuation at low currents, greater attenuation at higher currents, and greatest attenuation when either or both magnetic field or currents are absent. These data are explained by a model for secondary flows which affects heat transfer from the plasma. Application of a model for the magneto-acoustic phenomena in large scale MHD generators indicates that property fluctuations may grow appreciably if the electrical resistance in the electrode boundary layers is small with respect to the resistance of the plasma core.

Simons, T.D.

1982-06-01T23:59:59.000Z

133

A scale model study of displacement ventilation with chilled ceilings  

E-Print Network (OSTI)

Displacement ventilation is a form of air-conditioning which provides good air quality and some energy savings. The air quality is better than for a conventional mixed ventilation system. The maximum amount of cooling that ...

Holden, Katherine J. A. (Katherine Joan Adrienne)

1995-01-01T23:59:59.000Z

134

Flame-vortex interaction and mixing behaviors of turbulent non-premixed jet flames under acoustic forcing  

SciTech Connect

This study examines the effect of acoustic excitation using forced coaxial air on the flame characteristics of turbulent hydrogen non-premixed flames. A resonance frequency was selected to acoustically excite the coaxial air jet due to its ability to effectively amplify the acoustic amplitude and reduce flame length and NO{sub x} emissions. Acoustic excitation causes the flame length to decrease by 15% and consequently, a 25% reduction in EINO{sub x} is achieved, compared to coaxial air flames without acoustic excitation at the same coaxial air to fuel velocity ratio. Moreover, acoustic excitation induces periodical fluctuation of the coaxial air velocity, thus resulting in slight fluctuation of the fuel velocity. From phase-lock PIV and OH PLIF measurement, the local flow properties at the flame surface were investigated under acoustic forcing. During flame-vortex interaction in the near field region, the entrainment velocity and the flame surface area increased locally near the vortex. This increase in flame surface area and entrainment velocity is believed to be a crucial factor in reducing flame length and NO{sub x} emission in coaxial jet flames with acoustic excitation. Local flame extinction occurred frequently when subjected to an excessive strain rate, indicating that intense mass transfer of fuel and air occurs radially inward at the flame surface. (author)

Kim, Munki; Choi, Youngil; Oh, Jeongseog; Yoon, Youngbin [School of Mechanical and Aerospace Engineering, Seoul National University, Seoul (Korea)

2009-12-15T23:59:59.000Z

135

Key Factors in Displacement Ventilation Systems for Better IAQ  

E-Print Network (OSTI)

This paper sets up a mathematical model of three-dimensional steady turbulence heat transfer in an air-conditioned room of multi-polluting heat sources. Numerical simulation helps identify key factors in displacement ventilation systems that affect air-quality in rooms of multi-polluting heat sources. Results show that it is very important to determine the suitable air-intemperature , air-inflow, and heat source quantity and dispersion, to obtain better displacement ventilation results.

Wang, X.; Chen, J.; Li, Y.; Wang, Z.

2006-01-01T23:59:59.000Z

136

Effect of toroidal rotation on the geodesic acoustic mode in magnetohydrodynamics  

Science Conference Proceedings (OSTI)

Theoretical research on the geodesic acoustic mode (GAM) induced by equilibrium toroidal rotation flow in the tokamak plasmas is approached by using ideal magnetohydrodynamic model. The dispersion relation of the GAM is presented by taking into account magnetic field perturbations. It is shown that {beta} can decrease the frequency of the GAM.

Ren Haijun [CAS Key Laboratory of Basic Plasma Physics, University of Science and Technology of China, Hefei 230026 (China)

2012-09-15T23:59:59.000Z

137

Measurement of Turbulence in the Oceanic Bottom Boundary layer with an Acoustic Current Meter Array  

Science Conference Proceedings (OSTI)

A vertical array of acoustic current meters measures the vector flow field in the lowest 5 m of the oceanic boundary layer. By resolving the velocity to 0.03 cm s?1 over 15 cm paths, it samples the dominant turbulent eddies responsible for ...

Albert J. Williams 3rd; John S. Tochko; Richard L. Koehler; William D. Grant; Thomas F. Gross; Christopher V. R. Dunn

1987-06-01T23:59:59.000Z

138

Quantum entanglement for acoustic spintronics  

SciTech Connect

We consider the entanglement of spins for two electrons contributing to the acoustoelectric current driven by a surface acoustic wave (SAW) in two adjacent narrow channels by calculating their exchange energy (J). The channels belong to an acoustic nanocircuit which comprises a network of quasi-one-dimensional pinched-off channels serving as wires along which SAW quantum dots transport electrons. This is motivated by possible practical applications involving quantum information processing and quantum computers. We calculate J as a function of time as the electrons travel side-by-side in the adjacent channels and as a function of the distance between the centers of the channels. The leakage from the state in which the system is prepared, is calculated. The oscillations in the leakage indicate the probability for the electron system to make transitions between the ground and excited states, or for an electron to hop back and forth between channels.

Gumbs, Godfrey; Abranyos, Yonatan [Department of Physics and Astronomy, Hunter College of the City University of New York, 695 Park Avenue, New York, New York 10021 (United States)

2004-11-01T23:59:59.000Z

139

Cylindrical acoustic levitator/concentrator  

DOE Patents (OSTI)

A low-power, inexpensive acoustic apparatus for levitation and/or concentration of aerosols and small liquid/solid samples having particulates up to several millimeters in diameter in air or other fluids is described. It is constructed from a commercially available, hollow cylindrical piezoelectric crystal which has been modified to tune the resonance frequency of the breathing mode resonance of the crystal to that of the interior cavity of the cylinder. When the resonance frequency of the interior cylindrical cavity is matched to the breathing mode resonance of the cylindrical piezoelectric transducer, the acoustic efficiency for establishing a standing wave pattern in the cavity is high. The cylinder does not require accurate alignment of a resonant cavity. Water droplets having diameters greater than 1 mm have been levitated against the force of gravity using; less than 1 W of input electrical power. Concentration of aerosol particles in air is also demonstrated.

Kaduchak, Gregory (Los Alamos, NM); Sinha, Dipen N. (Los Alamos, NM)

2002-01-01T23:59:59.000Z

140

Solid Rocket Motor Acoustic Testing  

DOE Green Energy (OSTI)

Acoustic data are often required for the determination of launch and powered flight loads for rocket systems and payloads. Such data are usually acquired during test firings of the solid rocket motors. In the current work, these data were obtained for two tests at a remote test facility where we were visitors. This paper describes the data acquisition and the requirements for working at a remote site, interfacing with the test hosts.

Rogers, J.D.

1999-03-31T23:59:59.000Z

Note: This page contains sample records for the topic "acoustics displacement flow" 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

Buoyancy effects on upward brine displacement caused by CO2 injection  

SciTech Connect

Upward displacement of brine from deep reservoirs driven by pressure increases resulting from CO{sub 2} injection for geologic carbon sequestration may occur through improperly sealed abandoned wells, through permeable faults, or through permeable channels between pinch-outs of shale formations. The concern about upward brine flow is that, upon intrusion into aquifers containing groundwater resources, the brine may degrade groundwater. Because both salinity and temperature increase with depth in sedimentary basins, upward displacement of brine involves lifting fluid that is saline but also warm into shallower regions that contain fresher, cooler water. We have carried out dynamic simulations using TOUGH2/EOS7 of upward displacement of warm, salty water into cooler, fresher aquifers in a highly idealized two-dimensional model consisting of a vertical conduit (representing a well or permeable fault) connecting a deep and a shallow reservoir. Our simulations show that for small pressure increases and/or high-salinity-gradient cases, brine is pushed up the conduit to a new static steady-state equilibrium. On the other hand, if the pressure rise is large enough that brine is pushed up the conduit and into the overlying upper aquifer, flow may be sustained if the dense brine is allowed to spread laterally. In this scenario, dense brine only contacts the lower-most region of the upper aquifer. In a hypothetical case in which strong cooling of the dense brine occurs in the upper reservoir, the brine becomes sufficiently dense that it flows back down into the deeper reservoir from where it came. The brine then heats again in the lower aquifer and moves back up the conduit to repeat the cycle. Parameter studies delineate steady-state (static) and oscillatory solutions and reveal the character and period of oscillatory solutions. Such oscillatory solutions are mostly a curiosity rather than an expected natural phenomenon because in nature the geothermal gradient prevents the cooling in the upper aquifer that occurs in the model. The expected effect of upward brine displacement is either establishment of a new hydrostatic equilibrium or sustained upward flux into the bottom-most region of the upper aquifer.

Oldenburg, C.M.; Rinaldi, A.

2010-01-15T23:59:59.000Z

142

DOE's Office of Science Sets up Program to Aid Scientists Displaced...  

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

Sets up Program to Aid Scientists Displaced by Hurricane Katrina DOE's Office of Science Sets up Program to Aid Scientists Displaced by Hurricane Katrina September 9, 2005 -...

143

Alion Science and Technology / Riverbank Acoustical ...  

Science Conference Proceedings (OSTI)

... E2179 Laboratory Measurement of the Effectiveness of Floor Coverings in Reducing ... 08/P61] AAMA 1801 Acoustical Rating of Windows, Doors and ...

2013-07-19T23:59:59.000Z

144

Wind Turbine Acoustic Noise A white paper  

E-Print Network (OSTI)

Wind Turbine Acoustic Noise A white paper Prepared by the Renewable Energy Research Laboratory...................................................................... 8 Sound from Wind Turbines .............................................................................................. 10 Sources of Wind Turbine Sound

Massachusetts at Amherst, University of

145

Ricoh Company LTD. Acoustical Testing Laboratory  

Science Conference Proceedings (OSTI)

Acoustical Testing Laboratory. ... 143-8555 JAPAN Contact: Mr. Seiji Nakamura Phone: 81-046-292-3871 Fax: E-Mail: seiji.nakamura@nts.ricoh.co.jp ...

2013-11-08T23:59:59.000Z

146

THE EFFECT OF ACOUSTIC MODULATION ON SPRAY ...  

Science Conference Proceedings (OSTI)

... that at full load in liquid injection systems, extra energy or perturbation is ... The acoustic modulation is generated by a piezoelectric crystal driven by a ...

147

Time synchronization for underwater acoustic sensor networks.  

E-Print Network (OSTI)

??The unique properties of underwater acoustic communications, such as large and time-varying propagation, low and range dependent bandwidth, and adverse operating environment make the synchronization… (more)

Khandoker, Tarik-Ul Islam

2012-01-01T23:59:59.000Z

148

Displacement Damage in Silicon Carbide Irradiated in Fission Reactors  

SciTech Connect

Calculations are performed for displacement damage in SiC due to irradiation in the neutron environments of various types of nuclear reactors using the best available models and nuclear data. The displacement damage calculations use recently developed damage functions for SiC that are based on extensive molecular dynamics simulations of displacement events1. Displacements per atom (DPA) cross sections for SiC have been calculated as a function of neutron energy, and they are presented here in tabular form to facilitate their use as the standard measure of displacement damage for irradiated SiC. DPA cross sections averaged over the neutron energy spectrum are calculated for neutron spectra in the cores of typical commercial reactors and in the test sample irradiation regions of several materials test reactors used in both past and present irradiation testing. Particular attention is focused on a next-generation high-temperature gas-cooled pebble bed reactor, for which the high-temperature properties of silicon carbide fiber-reinforced silicon carbide composites are well suited. Calculated transmutations and activation levels in a pebble bed reactor are compared to those in other reactors.

Heinisch, Howard L.; Greenwood, Lawrence R.; Weber, William J.; Williford, Rick E.

2004-04-05T23:59:59.000Z

149

Method for determining the octane rating of gasoline samples by observing corresponding acoustic resonances therein  

DOE Patents (OSTI)

A method is described for determining the octane rating of gasoline samples by observing corresponding acoustic resonances therein. A direct correlation between the octane rating of gasoline and the frequency of corresponding acoustic resonances therein has been experimentally observed. Therefore, the octane rating of a gasoline sample can be directly determined through speed of sound measurements instead of by the cumbersome process of quantifying the knocking quality of the gasoline. Various receptacle geometries and construction materials may be employed. Moreover, it is anticipated that the measurements can be performed on flowing samples in pipes, thereby rendering the present method useful in refineries and distilleries. 3 figs.

Sinha, D.N.; Anthony, B.W.

1997-02-25T23:59:59.000Z

150

Method for determining the octane rating of gasoline samples by observing corresponding acoustic resonances therein  

DOE Patents (OSTI)

A method for determining the octane rating of gasoline samples by observing corresponding acoustic resonances therein. A direct correlation between the octane rating of gasoline and the frequency of corresponding acoustic resonances therein has been experimentally observed. Therefore, the octane rating of a gasoline sample can be directly determined through speed of sound measurements instead of by the cumbersome process of quantifying the knocking quality of the gasoline. Various receptacle geometries and construction materials may be employed. Moreover, it is anticipated that the measurements can be performed on flowing samples in pipes, thereby rendering the present method useful in refineries and distilleries.

Sinha, Dipen N. (Los Alamos, NM); Anthony, Brian W. (Clearfield, PA)

1997-01-01T23:59:59.000Z

151

National Labs Open Doors to Displaced Japanese Researchers | Department of  

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

National Labs Open Doors to Displaced Japanese Researchers National Labs Open Doors to Displaced Japanese Researchers National Labs Open Doors to Displaced Japanese Researchers July 5, 2011 - 1:42pm Addthis Maiko Kofu, Atsushi Nagoe and Osamu Yamamuro examine their sample attached to the end of the cryostat stick after running an experiment at Oak Ridge National Laboratory’s Spallation Neutron Source. | Department of Energy Photo | Courtesy of Oak Ridge National Laboratory | Public Domain | Maiko Kofu, Atsushi Nagoe and Osamu Yamamuro examine their sample attached to the end of the cryostat stick after running an experiment at Oak Ridge National Laboratory's Spallation Neutron Source. | Department of Energy Photo | Courtesy of Oak Ridge National Laboratory | Public Domain | Charles Rousseaux Charles Rousseaux

152

Optimal adaptive sampling for continental shelf acoustic forecasting.  

Science Conference Proceedings (OSTI)

Shallow water acoustic propagation variability is driven by bathymetry and geo?acoustic and oceanographic variabilities. At the shelf?break

Kevin D. Heaney

2009-01-01T23:59:59.000Z

153

Reliable Data Communication and Storage in Underwater Acoustic Networks.  

E-Print Network (OSTI)

??Underwater acoustic communications (UAC) and networking (UAN) are promising paradigms for various oceanic applications. However, acoustic signal transmissions are characterized by long propagation delay, frequency-dependent… (more)

Cao, Rui

2011-01-01T23:59:59.000Z

154

The effect of Coulombic friction on spatial displacement statistics  

E-Print Network (OSTI)

The phenomenon of Coulombic friction enters the stochastic description of dry friction between two solids and the statistic characterization of vibrating granular media. Here we analyze the corresponding Fokker-Planck equation including both velocity and spatial components, exhibiting a formal connection to a quantum mechanical harmonic oscillator in the presence of a delta potential. Numerical solutions for the resulting spatial displacement statistics show a crossover from exponential to Gaussian displacement statistics. We identify a transient intermediate regime that exhibits multiscaling properties arising from the contribution of Coulombic friction. The possible role of these effects during observations in diffusion experiments is shortly discussed.

Andreas M. Menzel; Nigel Goldenfeld

2010-10-30T23:59:59.000Z

155

Nano-displacement measurements using spatially multimode squeezed light  

E-Print Network (OSTI)

We demonstrate the possibility of surpassing the quantum noise limit for simultaneous multi-axis spatial displacement measurements that have zero mean values. The requisite resources for these measurements are squeezed light beams with exotic transverse mode profiles. We show that, in principle, lossless combination of these modes can be achieved using the non-degenerate Gouy phase shift of optical resonators. When the combined squeezed beams are measured with quadrant detectors, we experimentally demonstrate a simultaneous reduction in the transverse x- and y- displacement fluctuations of 2.2 dB and 3.1 dB below the quantum noise limit.

N. Treps; N. Grosse; W. P. Bowen; M. T. L. Hsu; A. Maitre; C. Fabre; H. -A. Bachor; P. K. Lam

2003-11-19T23:59:59.000Z

156

Acoustical properties of drill strings  

DOE Green Energy (OSTI)

The recovery of petrochemical and geothermal resources requires extensive drilling of wells to increasingly greater depths. Real-time collection and telemetry of data about the drilling process while it occurs thousands of feet below the surface is an effective way of improving the efficiency of drilling operations. Unfortunately, due to hostile down-hole environments, telemetry of this data is an extremely difficult problem. Currently, commercial systems transmit data to the surface by producing pressure pulses within the portion of the drilling mud enclosed in the hollow steel drill string. Transmission rates are between two and four data bits per second. Any system capable of raising data rates without increasing the complexity of the drilling process will have significant economic impact. One alternative system is based upon acoustical carrier waves generated within the drill string itself. If developed, this method would accommodate data rates up to 100 bits per second. Unfortunately, the drill string is a periodic structure of pipe and threaded tool joints, the transmission characteristics are very complex and exhibit a banded and dispersive structure. Over the past forty years, attempts to field systems based upon this transmission method have resulted in little success. This paper examines this acoustical transmission problem in great detail. The basic principles of acoustic wave propagation in the periodic structure of the drill string are examined through theory, laboratory experiment, and field test. The results indicate the existence of frequency bands which are virtually free of attenuation and suitable for data transmission at high bit rates. 9 refs., 38 figs., 2 tabs.

Drumheller, D.S.

1988-08-01T23:59:59.000Z

157

Acoustically enhanced heat exchange and drying apparatus  

DOE Patents (OSTI)

A heat transfer drying apparatus includes an acoustically augmented heat transfer chamber for receiving material to be dried. The chamber includes a first heat transfer gas inlet, a second heat transfer gas inlet, a material inlet, and a gas outlet which also serves as a dried material and gas outlet. A non-pulsing first heat transfer gas source provides a first drying gas to the acoustically augmented heat transfer chamber through the first heat transfer gas inlet. A valveless, continuous second heat transfer gas source provides a second drying gas to the acoustically augmented heat transfer chamber through the second heat transfer gas inlet. The second drying gas also generates acoustic waves which bring about acoustical coupling with the gases in the acoustically augmented heat transfer chamber. The second drying gas itself oscillates at an acoustic frequency of approximately 180 Hz due to fluid mechanical motion in the gas. The oscillations of the second heat transfer gas coupled to the first heat transfer gas in the acoustically augmented heat transfer chamber enhance heat and mass transfer by convection within the chamber. 3 figs.

Bramlette, T.T.; Keller, J.O.

1987-07-10T23:59:59.000Z

158

On acoustic wave generation in uniform shear flow G. Gogoberidze  

E-Print Network (OSTI)

, Abastumani Astrophysical Observatory, Tbilisi 0160, Georgia P. J. Morrison Department of Physics Department, Tbilisi State University, Tbilisi 0179, Georgia (Dated: October 2004) Abstract The linear

Morrison, Philip J.,

159

Three-Dimensional Nonlinear Acoustical Holography  

E-Print Network (OSTI)

Nearfield Acoustical Holography (NAH) is an acoustic field visualization technique that can be used to reconstruct three-dimensional (3-D) acoustic fields by projecting two-dimensional (2-D) data measured on a hologram surface. However, linear NAH algorithms developed and improved by many researchers can result in significant reconstruction errors when they are applied to reconstruct 3-D acoustic fields that are radiated from a high-level noise source and include significant nonlinear components. Here, planar, nonlinear acoustical holography procedures are developed that can be used to reconstruct 3-D, nonlinear acoustic fields radiated from a high-level noise source based on 2-D acoustic pressure data measured on a hologram surface. The first nonlinear acoustic holography procedure is derived for reconstructing steady-state acoustic pressure fields by applying perturbation and renormalization methods to nonlinear, dissipative, pressure-based Westervelt Wave Equation (WWE). The nonlinear acoustic pressure fields radiated from a high-level pulsating sphere and an infinite-size, vibrating panel are used to validate this procedure. Although the WWE-based algorithm is successfully validated by those two numerical simulations, it still has several limitations: (1) Only the fundamental frequency and its second harmonic nonlinear components can be reconstructed; (2) the application of this algorithm is limited to mono-frequency source cases; (3) the effects of bent wave rays caused by transverse particle velocities are not included; (4) only acoustic pressure fields can be reconstructed. In order to address the limitations of the steady-state, WWE-based procedure, a transient, planar, nonlinear acoustic holography algorithm is developed that can be used to reconstruct 3-D nonlinear acoustic pressure and particle velocity fields. This procedure is based on Kuznetsov Wave Equation (KWE) that is directly solved by using temporal and spatial Fourier Transforms. When compared to the WWE-based procedure, the KWE-based procedure can be applied to multi-frequency source cases where each frequency component can contain both linear and nonlinear components. The effects of nonlinear bent wave rays can be also considered by using this algorithm. The KWE-based procedure is validated by conducting an experiment with a compression driver and four numerical simulations. The numerical and experimental results show that holographically-projected acoustic fields match well with directly-calculated and directly-measured fields.

Niu, Yaying

2013-05-01T23:59:59.000Z

160

Influence of Viscous and Capillary Forces on Immiscible Fluid Displacement: Pore-Scale Experimental Study in a Water-Wet Micromodel Demonstrating Viscous and Capillary Fingering  

Science Conference Proceedings (OSTI)

Unstable immiscible fluid displacement in porous media affects geological carbon sequestration, enhanced oil recovery, and groundwater contamination by nonaqueous phase liquids. Characterization of immiscible displacement processes at the pore-scale is important to better understand macroscopic processes at the continuum-scale. A series of displacement experiments was conducted to investigate the impacts of viscous and capillary forces on displacement stability and fluid saturation distributions in a homogeneous water-wet pore network micromodel with precisely-microfabricated pore structures. Displacements were studied using seven wetting-nonwetting fluid pairs with viscosity ratios M (viscosity of the advancing nonwetting fluid divided by the viscosity of the displaced wetting fluid) ranging four orders of magnitude from logM = -1.95 to 1.88. The micromodel was initially saturated with either polyethylene glycol 200 (PEG200) or water as a wetting fluid, which was then displaced by a nonwetting alkane fluid under different flow rates. Capillary numbers (Ca) ranged over four orders of magnitude for the reported experiments, from logCa = -5.88 to -1.02. Fluorescent microscopy was used to visualize displacement and measure nonwetting fluid saturation distributions. These experiments extend the classical work by Lenormand et al. by using water-wet micromodels, high-precision fabrication, and enhanced image analysis of the saturation distributions. In the micromodel experiments initially saturated with PEG200, a viscous wetting fluid, unstable displacement occurred by viscous fingering over the whole range of imposed capillary numbers. For the experiments initially saturated with water, unstable displacement occurred by capillary fingering at low capillary numbers. When the viscous forces were increased by increasing the injection rate, crossover into stable displacement was observed for the fluid pairs with M > 0. For unstable displacement experiments applying the same capillary number for the various fluid pairs, nonwetting fluid saturations were higher when capillary fingering was the dominant fingering process compared to viscous fingering. Our saturation distributions are consistent with other published experimental work and confirm the numerical results obtained by Lenormand et al.

Zhang, Changyong; Oostrom, Martinus; Wietsma, Thomas W.; Grate, Jay W.; Warner, Marvin G.

2011-08-18T23:59:59.000Z

Note: This page contains sample records for the topic "acoustics displacement flow" 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

Piezoelectric materials used in underwater acoustic transducers  

Science Conference Proceedings (OSTI)

Piezoelectric materials have been used in underwater acoustic transducers for nearly a century. In this paper, we reviewed four different types of piezoelectric materials: piezoelectric ceramics, single crystals, composites, and polymers, which are widely used in underwater acoustic transducers nowadays. Piezoelectric ceramics are the most dominant material type and are used as a single-phase material or one of the end members in composites. Piezoelectric single crystals offer outstanding electromechanical response but are limited by their manufacturing cost. Piezoelectric polymers provide excellent acoustic impedance matching and transducer fabrication flexibility although their piezoelectric properties are not as good as ceramics and single crystals. Composites combined the merits of ceramics and polymers and are receiving increased attention. The typical structure and electromechanical properties of each type of materials are introduced and discussed with respect to underwater acoustic transducer applications. Their advantages and disadvantages are summarized. Some of the critical design considerations when developing underwater acoustic transducers with these materials are also touched upon.

Li, Huidong; Deng, Zhiqun; Carlson, Thomas J.

2012-07-07T23:59:59.000Z

162

Potential displacement of petroleum imports by solar energy technologies  

DOE Green Energy (OSTI)

The United States currently imports close to half of its petroleum requirements. This report delineates the economic, social, and political costs of such a foreign oil dependency. These costs are often intangible, but combined they clearly constitute a greater price for imported petroleum than the strictly economic cost. If we can assume that imported oil imposes significant socioeconomic costs upon the American economy and society, one way to reduce these costs is to develop alternative, domestic energy sources - such as solar energy technologies - which can displace foreign petroleum. The second half of this report estimates that by the year 2000, solar energy technologies can displace 3.6 quads of petroleum. This figure includes solar energy applications in utilities, industrial and agricultural process heat, and transportation. The estimate can be treated as a lower bound; if the United States were to achieve the proposed goal of 20 quads by 2000, the amount of displaced oil probably would be greater. Although all the displaced oil would not be imported, the reduction in imported petroleum would relieve many of the conditions that increase the present cost of foreign oil to the American consumer.

DeLeon, P.; Jackson, B.L.; McNown, R.F.; Mahrenholz, G.J.

1980-05-01T23:59:59.000Z

163

ACOUSTICAL IMAGING AND MECHANICAL PROPERTIES OF SOFT ROCK AND MARINE SEDIMENTS  

SciTech Connect

The research during this project has concentrated on developing a correlation between rock deformation mechanisms and their acoustic velocity signature. This has included investigating: (1) the acoustic signature of drained and undrained unconsolidated sands, (2) the acoustic emission signature of deforming high porosity rocks (in comparison to their low porosity high strength counterparts), (3) the effects of deformation on anisotropic elastic and poroelastic moduli, and (4) the acoustic tomographic imaging of damage development in rocks. Each of these four areas involve triaxial experimental testing of weak porous rocks or unconsolidated sand and involves measuring acoustic properties. The research is directed at determining the seismic velocity signature of damaged rocks so that 3-D or 4-D seismic imaging can be utilized to image rock damage. These four areas of study are described in the report: (1) Triaxial compression experiments have been conducted on unconsolidated Oil Creek sand at high confining pressures. (2) Initial experiments on measuring the acoustic emission activity from deforming high porosity Danian chalk were accomplished and these indicate that the AE activity was of a very low amplitude. (3) A series of triaxial compression experiments were conducted to investigate the effects of induced stress on the anisotropy developed in dynamic elastic and poroelastic parameters in rocks. (4) Tomographic acoustic imaging was utilized to image the internal damage in a deforming porous limestone sample. Results indicate that the deformation damage in rocks induced during laboratory experimentation can be imaged tomographically in the laboratory. By extension the results also indicate that 4-D seismic imaging of a reservoir may become a powerful tool for imaging reservoir deformation (including imaging compaction and subsidence) and for imaging zones where drilling operation may encounter hazardous shallow water flows.

Thurman E. Scott, Jr.; Younane Abousleiman

2004-04-01T23:59:59.000Z

164

Sparse Multichannel Estimation Algorithm for Cooperative Underwater Acoustic Communication Networks  

E-Print Network (OSTI)

Introduction: Cooperative Underwater Acoustic Communicationsgain for wireless and underwater network in interference-

Richard, Nick; Mitra, Urbasi

2007-01-01T23:59:59.000Z

165

Flow assurance and multiphase pumping  

E-Print Network (OSTI)

A robust understanding and planning of production enhancement and flow assurance is required as petroleum E&P activities are targeting deepwaters and long distances. Different flow assurance issues and their solutions are put together in this work. The use of multiphase pumps as a flow assurance solution is emphasized. Multiphase pumping aids flow assurance in different ways. However, the problem causing most concern is sand erosion. This work involved a detection-based sand monitoring method. Our objectives are to investigate the reliability of an acoustic sand detector and analyze the feasibility of gel injection as a method to mitigate sand erosion. Use of a sand detector coupled with twin-screw pumps is studied under varying flow conditions. The feasibility of gel injection to reduce slip and transport produced solids through twin-screw pump is investigated. A unique full-scale laboratory with multiphase pumps was utilized to carry out the experimental tests. The test results indicate that acoustic sand detection works in a narrow window around the calibration signature. An empirical correlation for predicting the twin-screw pump performance with viscous fluids was developed. It shows good agreement in the practical operational limits – 50% to 100% speed. The results indicate that viscous gel injection should be an effective erosion mitigation approach as it reduces slip, the principle cause of erosive wear. To correlate the performance of viscous fluid injection to hydroabrasive wear, further experimental investigation is needed.

Nikhar, Hemant G.

2006-12-01T23:59:59.000Z

166

Speaker verification system using acoustic data and non-acoustic data  

DOE Patents (OSTI)

A method and system for speech characterization. One embodiment includes a method for speaker verification which includes collecting data from a speaker, wherein the data comprises acoustic data and non-acoustic data. The data is used to generate a template that includes a first set of "template" parameters. The method further includes receiving a real-time identity claim from a claimant, and using acoustic data and non-acoustic data from the identity claim to generate a second set of parameters. The method further includes comparing the first set of parameters to the set of parameters to determine whether the claimant is the speaker. The first set of parameters and the second set of parameters include at least one purely non-acoustic parameter, including a non-acoustic glottal shape parameter derived from averaging multiple glottal cycle waveforms.

Gable, Todd J. (Walnut Creek, CA); Ng, Lawrence C. (Danville, CA); Holzrichter, John F. (Berkeley, CA); Burnett, Greg C. (Livermore, CA)

2006-03-21T23:59:59.000Z

167

Particle collection enhancement by acoustics  

SciTech Connect

The overall objective of this project is to demonstrate pulse combustion induced acoustic enhancement of coal ash agglomeration and sulfur capture efficiency at conditions typical of proposed direct coal-fired turbines. The MTCI proprietary approach results in agglomerates that allow the use of conventional cyclones to achieve very high particulate collection efficiency and eliminates the need for barrier filters which pose concerns regarding durability and economics. The goal of the program is to support the mission of the Department of Energy (DOE) for developing coal-fired combustion gas turbines. The MTCI concept can be packaged either as a hot flue gas clean-up subsystem for the existing combustor island configurations or as an alterative primary pulse combustor island with integrated sulfur capture, particulate agglomeration and capture, alkali gettering and NO{sub x} emissions control.

Mansour, M.N.; Chandran, R.R.; Duqum, J.N. [Manufacturing and Technology Conversion International, Inc., Columbia, MD (United States); Scaroni, A.W.; Koopman, G.H. [Pennsylvania State Univ., University Park, PA (United States); Loth, J.L. [West Virginia Univ., Morgantown, WV (United States)

1993-09-01T23:59:59.000Z

168

Copper vapor laser acoustic thermometry system  

DOE Patents (OSTI)

A copper vapor laser (CVL) acoustic thermometry system is disclosed. The invention couples an acoustic pulse a predetermined distance into a laser tube by means of a transducer and an alumina rod such that an echo pulse is returned along the alumina rod to the point of entry. The time differential between the point of entry of the acoustic pulse into the laser tube and the exit of the echo pulse is related to the temperature at the predetermined distance within the laser tube. This information is processed and can provide an accurate indication of the average temperature within the laser tube.

Galkowski, J.J.

1986-08-27T23:59:59.000Z

169

The 8th International Symposium on Flow Visualization: Conference report  

Science Conference Proceedings (OSTI)

The 8th International Symposium on Flow Visualization (8ISFV) was held in Sorrento, Italy, from the 1st to the 4th of September 1998. The Symposium has attracted, by far, the largest number of participants in the history of the meeting. The 313 presented ... Keywords: acoustics, advanced techniques, aircrafts, airfoils, applications, bluff bodies, cavity flows, channel flows, combustion, delta wings, droplets break-up, electrodynamics, engines, flow around cylinders, flow visualization, fluidics, holography, industrial processes, infrared thermography, instability, interferometry, jets, jets in cross flow, liquid crystals, low reynolds number flows, machines, medical applications, multiphase flows, natural convection, numerical visualizations, particle image velocimetry, porous media, rotating fluids, schlieren, shock waves, supersonic flows, three dimensional flows, turbomachines, turbulence, two phase flows, unsteady flow, vortices

G. M. Carlomagno

1999-01-01T23:59:59.000Z

170

Walker Branch Throughfall Displacement Experiment Data Report: Site  

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

D: D: LISTING OF THROUGHFALL DISPLACEMENT EXPERIMENT PUBLICATIONS A. INTRODUCTORY PAPERS AND SUMMARIES Hanson, P. J., D. E. Todd, D. W. Johnson, J. D. Joslin, and E. G. O'Neill (in press). Responses of eastern deciduous forests to precipitation change. In J. F. Weltzin and G. R. McPherson (eds.), Precipitation and Terrestrial Ecosystems, John Hopkins University Press, Baltimore. Hanson, P. J. 2000. Large-scale water manipulations. pp. 341-352. In O. E. Sala, R. B. Jackson, H. A. Mooney, and R. W. Howarth (eds.), Methods in Ecosystem Science , Springer- Verlag, New York. Hanson, P. J., D. E. Todd, N. T. Edwards, and M. A. Huston. 1995. Field performance of the Walker Branch Throughfall Displacement Experiment. pp. 307-313. In A. Jenkins, R. C. Ferrier, and C. Kirby (eds.), Ecosystem

171

Drainage Flow Characteristics and Inversion Breakup in Two Alberta Mountain Valleys  

Science Conference Proceedings (OSTI)

Wind and temperature profiles and corresponding acoustic sounder data collected in September 1982 are presented for nocturnal drainage flow and inversion breakup in two Alberta mountain valleys. The results show that the diurnal amplitude of ...

Steven K. Sakiyama

1990-10-01T23:59:59.000Z

172

The Time-Dependent Hydraulic Flow and Dissipation over the Still of Observatory Inlet  

Science Conference Proceedings (OSTI)

The time-dependent hydraulic flow over the sill of a tidally energetic fjord, Observatory Inlet, British Columbia, is studied. Acoustic observations of streamlines and velocity were made near the sill crest during the summer of 1982, a time when ...

Michael W. Stacey; Len J. Zedel

1986-06-01T23:59:59.000Z

173

Using a Broadband ADCP in a Tidal Channel. Part I: Mean Flow and Shear  

Science Conference Proceedings (OSTI)

This paper discusses the principles of measuring the mean velocity and its vertical shear in a turbulent flow using an acoustic Doppler current profiler (ADCP), and presents an analysis of data gathered in a tidal channel. The assumption of ...

Youyu Lu; Rolf G. Lueck

1999-11-01T23:59:59.000Z

174

Macroscopic displaced thermal field as the entanglement catalyst  

E-Print Network (OSTI)

We show that entanglement of multiple atoms can arise via resonant interaction with a displaced thermal field with a macroscopic photon-number. The cavity field acts as the catalyst, which is disentangled with the atomic system after the operation. Remarkably, the entanglement speed does not decrease as the average photon-number of the mixed thermal state increases. The atoms may evolve to a highly entangled state even when the photon-number of the cavity mode approaches infinity.

Zheng, Shi-Biao

2012-01-01T23:59:59.000Z

175

Macroscopic displaced thermal field as the entanglement catalyst  

E-Print Network (OSTI)

We show that entanglement of multiple atoms can arise via resonant interaction with a displaced thermal field with a macroscopic photon-number. The cavity field acts as the catalyst, which is disentangled with the atomic system after the operation. Remarkably, the entanglement speed does not decrease as the average photon-number of the mixed thermal state increases. The atoms may evolve to a highly entangled state even when the photon-number of the cavity mode approaches infinity.

Shi-Biao Zheng

2012-03-07T23:59:59.000Z

176

Proceedings: Working Fluids for Positive Displacement Chillers: Research Workshop  

Science Conference Proceedings (OSTI)

The phaseout of chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) requires development of non-ozone-depleting refrigerants for commercial chillers. When implemented, these new refrigerants must operate with efficiencies at least equal to those of the CFCs and HCFCs to avoid increasing energy use or utility peak demands. This July 1992 EPRI workshop identified refrigerant and equipment R&D needs for developing ozone-safe positive displacement chillers.

1993-03-01T23:59:59.000Z

177

STRAIGHTENING THE DENSITY-DISPLACEMENT RELATION WITH A LOGARITHMIC TRANSFORM  

Science Conference Proceedings (OSTI)

We investigate the use of a logarithmic density variable in estimating the Lagrangian displacement field motivated by the success of a logarithmic transformation in restoring information to the matter power spectrum. The logarithmic relation is an extension of the linear relation, motivated by the continuity equation, in which the density field is assumed to be proportional to the divergence of the displacement field; we compare the linear and logarithmic relations by measuring both of these fields directly in a cosmological N-body simulation. The relative success of the logarithmic and linear relations depends on the scale at which the density field is smoothed. Thus we explore several ways of measuring the density field, including Cloud-In-Cell smoothing, adaptive smoothing, and the (scale-independent) Delaunay tessellation, and we use both a Fourier-space and a geometrical tessellation approach to measuring the divergence. We find that the relation between the divergence of the displacement field and the density is significantly tighter and straighter with a logarithmic density variable, especially at low redshifts and for very small ({approx}2 h{sup -1} Mpc) smoothing scales. We find that the grid-based methods are more reliable than the tessellation-based method of calculating both the density and the divergence fields, though in both cases the logarithmic relation works better in the appropriate regime, which corresponds to nonlinear scales for the grid-based methods and low densities for the tessellation-based method.

Falck, Bridget L.; Neyrinck, Mark C.; Aragon-Calvo, Miguel A.; Lavaux, Guilhem; Szalay, Alexander S. [Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles St., Baltimore, MD 21218 (United States)

2012-01-20T23:59:59.000Z

178

Building Energy Software Tools Directory: Acoustics Program  

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

Acoustics Program Acoustics Program Developed to help designers accurately model the sound level reaching building tenant's ears, the Trane Acoustics Program (TAP) "projects" equipment sound power data through the surroundings (e.g., floors, ductwork, walls), to estimate the sound level that will be heard. Industry-standard calculations published by ASHRAE's 1991 Algorithms for HVAC Acoustics handbook are the basis for this estimate. In TAP, you can model the conditions of an HVAC system by choosing specific equipment and building component criteria. TAP will analyze the sound path and calculate the total effect for the enclosed space. You can continuously adjust the data and system design criteria to compare the results effortlessly. TAP will even plot presentation quality graphs of

179

Errors in Radio Acoustic Sounding of Temperature  

Science Conference Proceedings (OSTI)

With the use of simultaneous correction for radial wind, the accuracy of radio acoustic sounding systems for the measurement of temperature has been substantially improved. The temperature accuracy can now be affected by a number of factors that ...

Wayne M. Angevine; W. L. Ecklund

1994-06-01T23:59:59.000Z

180

Audioptimization : global-based acoustic design  

E-Print Network (OSTI)

Acoustic design is a difficult problem, because the human perception of sound depends on such things as decibel level, direction of propagation, and attenuation over time, none of which are tangible or visible. The advent ...

Monks, Michael Christopher, 1958-

1999-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "acoustics displacement flow" 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

Weather Classification Using Passive Acoustic Drifters  

Science Conference Proceedings (OSTI)

Weather observations are needed in remote oceanic regions to support numerical weather forecast models, to provide surface truth for satellite sensors, and to help understand global weather patterns. An acoustic mini-drifting buoy using no moving ...

Jeffrey A. Nystuen; Harry D. Selsor

1997-06-01T23:59:59.000Z

182

An Acoustic Doppler and Electromagnetic Velocity Profiler  

Science Conference Proceedings (OSTI)

A freely failing current meter called the Absolute Velocity Profiler (AVP) is described. This profiler is an expansion of a previously developed instrument, the Electro-Magnetic Velocity Profiler (EMVP), with the additional capability of acoustic ...

Thomas B. Sanford; Robert G. Driver; John H. Dunlap

1985-06-01T23:59:59.000Z

183

Scattering of ion-acoustic solitons  

SciTech Connect

A series of experiments is described that is designed to ascertain the properties of the scattering of planar ion-acoustic solitons from objects of various shapes. The scattered solitons are compared with those radiated from the same objects.

Raychaudhuri, S.; Chang, H.; Tsikis, E.K.; Lonngren, K.E.

1985-07-01T23:59:59.000Z

184

Global Ocean Warming: An Acoustic Measure?  

Science Conference Proceedings (OSTI)

Explosions of 300 lbs of TNT at 1 km depth off Perth, Australia were recorded on Bermuda hydrophones, demonstrating 30 years age the feasibility of global acoustic transmissions. Climate-induced changes in ocean temperature (and hence in sound ...

W. H. Munk; A. M. G. Forbes

1989-11-01T23:59:59.000Z

185

Underwater acoustic MIMO OFDM: an experimental analysis  

E-Print Network (OSTI)

Performance of multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) is analyzed on an experimental shallow water acoustic channel. Different modulation levels, numbers of subcarriers and ...

Palou Visa, Guillem

186

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

187

Tunable damper for an acoustic wave guide  

DOE Patents (OSTI)

A damper for tunably damping acoustic waves in an ultrasonic waveguide is provided which may be used in a hostile environment such as a nuclear reactor. The area of the waveguide, which may be a selected size metal rod in which acoustic waves are to be damped, is wrapped, or surrounded, by a mass of stainless steel wool. The wool wrapped portion is then sandwiched between tuning plates, which may also be stainless steel, by means of clamping screws which may be adjusted to change the clamping force of the sandwiched assembly along the waveguide section. The plates are preformed along their length in a sinusoidally bent pattern with a period approximately equal to the acoustic wavelength which is to be damped. The bent pattern of the opposing plates are in phase along their length relative to their sinusoidal patterns so that as the clamping screws are tightened a bending stress is applied to the waveguide at 180/sup 0/ intervals along the damping section to oppose the acoustic wave motions in the waveguide and provide good coupling of the wool to the guide. The damper is tuned by selectively tightening the clamping screws while monitoring the amplitude of the acoustic waves launched in the waveguide. It may be selectively tuned to damp particular acoustic wave modes (torsional or extensional, for example) and/or frequencies while allowing others to pass unattenuated.

Rogers, S.C.

1982-10-21T23:59:59.000Z

188

Tunable damper for an acoustic wave guide  

DOE Patents (OSTI)

A damper for tunably damping acoustic waves in an ultrasonic waveguide is provided which may be used in a hostile environment such as a nuclear reactor. The area of the waveguide, which may be a selected size metal rod in which acoustic waves are to be damped, is wrapped, or surrounded, by a mass of stainless steel wool. The wool wrapped portion is then sandwiched between tuning plates, which may also be stainless steel, by means of clamping screws which may be adjusted to change the clamping force of the sandwiched assembly along the waveguide section. The plates are preformed along their length in a sinusoidally bent pattern with a period approximately equal to the acoustic wavelength which is to be damped. The bent pattern of the opposing plates are in phase along their length relative to their sinusoidal patterns so that as the clamping screws are tightened a bending stress is applied to the waveguide at 180.degree. intervals along the damping section to oppose the acoustic wave motions in the waveguide and provide good coupling of the wool to the guide. The damper is tuned by selectively tightening the clamping screws while monitoring the amplitude of the acoustic waves launched in the waveguide. It may be selectively tuned to damp particular acoustic wave modes (torsional or extensional, for example) and/or frequencies while allowing others to pass unattenuated.

Rogers, Samuel C. (Knoxville, TN)

1984-01-01T23:59:59.000Z

189

The Displacement of Hydrogen-Deuterium at High Flow Rate in Palladium Particle Bed  

Science Conference Proceedings (OSTI)

Isotope Separation / Proceedings of the Sixth International Conference on Tritium Science and Technology Tsukuba, Japan November 12-16, 2001

Li Gan; Lu Guangda; Jiang Guoqiang

190

Acoustic plane wave preferential orientation of metal oxide superconducting materials  

DOE Patents (OSTI)

A polycrystalline metal oxide such as YBa.sub.2 Cu.sub.3 O.sub.7-X (where 0flow is accomplished by an applied acoustic plane wave in the acoustic or ultrasonic frequency range (either progressive or standing) in applying a torque to each crystal particle. The ceramic slip is then set and fired by conventional methods to produce a conductor with preferentially oriented grains and substantially enhanced current carrying capacity.

Tolt, Thomas L. (North Olmsted, OH); Poeppel, Roger B. (Glen Ellyn, IL)

1991-01-01T23:59:59.000Z

191

Molecular dynamics simulation of displacement cascades in FeCr alloys  

E-Print Network (OSTI)

Molecular dynamics simulation of displacement cascades in Fe­Cr alloys L. Malerba a,*, D. Terentyev by displacement cascades in the relevant material. Molecular dynamics (MD) is well known to be the simulation tool

192

Modification of the Dykstra-Parsons method to incorporate Buckley-Leverett displacement theory for waterfloods.  

E-Print Network (OSTI)

??The Dykstra-Parsons model describes layer 1-D oil displacement by water in multilayered reservoirs. The main assumptions of the model are: piston-like displacement of oil by… (more)

Gasimov, Rustam Rauf

2005-01-01T23:59:59.000Z

193

Estimating Undrained Strength of Clays from Direct Shear Testing at Fast Displacement Rates  

E-Print Network (OSTI)

and Germaine, J.T. (1996), “Rate-dependent undrained shearTesting at Fast Displacement Rates Andrew D. Bro 1 , M.variable shear displacement rates on specimens composed of

Bro, Andrew D; Stewart, Jonathan P; Pradel, Daniel E

2013-01-01T23:59:59.000Z

194

Proceedings of the 11th European Conference on Underwater Acoustics ACHIEVABLE RATES OF UNDERWATER ACOUSTIC OFDM  

E-Print Network (OSTI)

Proceedings of the 11th European Conference on Underwater Acoustics ACHIEVABLE RATES OF UNDERWATER-Telecom, Telecom Bretagne, UMR CNRS 6285 Lab-STICC, Ueb, Brest, France J.-M. Passerieux Thales Underwater Systems maintaining acceptable data rates, remains one of the major difficulty faced by underwater acoustic

Paris-Sud XI, Université de

195

Particle sorter comprising a fluid displacer in a closed-loop fluid circuit  

SciTech Connect

Disclosed herein are methods and devices utilizing a fluid displacer in a closed-loop fluid circuit.

Perroud, Thomas D. (San Jose, CA); Patel, Kamlesh D. (Dublin, CA); Renzi, Ronald F. (Tracy, CA)

2012-04-24T23:59:59.000Z

196

Imaging of Acoustic Waves in Sand  

SciTech Connect

There is considerable interest in detecting objects such as landmines shallowly buried in loose earth or sand. Various techniques involving microwave, acoustic, thermal and magnetic sensors have been used to detect such objects. Acoustic and microwave sensors have shown promise, especially if used together. In most cases, the sensor package is scanned over an area to eventually build up an image or map of anomalies. We are proposing an alternate, acoustic method that directly provides an image of acoustic waves in sand or soil, and their interaction with buried objects. The INEEL Laser Ultrasonic Camera utilizes dynamic holography within photorefractive recording materials. This permits one to image and demodulate acoustic waves on surfaces in real time, without scanning. A video image is produced where intensity is directly and linearly proportional to surface motion. Both specular and diffusely reflecting surfaces can be accomodated and surface motion as small as 0.1 nm can be quantitatively detected. This system was used to directly image acoustic surface waves in sand as well as in solid objects. Waves as frequencies of 16 kHz were generated using modified acoustic speakers. These waves were directed through sand toward partially buried objects. The sand container was not on a vibration isolation table, but sat on the lab floor. Interaction of wavefronts with buried objects showed reflection, diffraction and interference effects that could provide clues to location and characteristics of buried objects. Although results are preliminary, success in this effort suggests that this method could be applied to detection of buried landmines or other near-surface items such as pipes and tanks.

Deason, Vance Albert; Telschow, Kenneth Louis; Watson, Scott Marshall

2003-08-01T23:59:59.000Z

197

Method and apparatus of spectro-acoustically enhanced ultrasonic detection for diagnostics  

SciTech Connect

An apparatus for detecting a discontinuity in a material includes a source of electromagnetic radiation has a wavelength and an intensity sufficient to induce an enhancement in contrast between a manifestation of an acoustic property in the material and of the acoustic property in the discontinuity, as compared to when the material is not irradiated by the electromagnetic radiation. An acoustic emitter directs acoustic waves to the discontinuity in the material. The acoustic waves have a sensitivity to the acoustic property. An acoustic receiver receives the acoustic waves generated by the acoustic emitter after the acoustic waves have interacted with the material and the discontinuity. The acoustic receiver also generates a signal representative of the acoustic waves received by the acoustic receiver. A processor, in communication with the acoustic receiver and responsive to the signal generated by the acoustic receiver, is programmed to generate informational output about the discontinuity based on the signal generated by the acoustic receiver.

Vo-Dinh, Tuan (Knoxville, TN); Norton, Stephen J. (Raleigh, NC)

2001-01-01T23:59:59.000Z

198

Finding New Thermoelectric Compounds Using Crystallographic Data: Atomic Displacement Parameters  

DOE Green Energy (OSTI)

A new structure-property relationship is discussed which links atomic displacement parameters (ADPs) and the lattice thermal conductivity of clathrate-like compounds. For many clathrate-like compounds, in which one of the atom types is weakly bound and ''rattles'' within its atomic cage, room temperature ADP information can be used to estimate the room temperature lattice thermal conductivity, the vibration frequency of the ''rattler'', and the temperature dependence of the heat capacity. Neutron data and X-ray crystallography data, reported in the literature, are used to apply this analysis to several promising classes of thermoelectric materials.

Chakoumakos, B.C.; Mandrus, D.G.; Sales, B.C.; Sharp, J.W.

1999-08-29T23:59:59.000Z

199

Carbonaceous adsorbent regeneration and halocarbon displacement by hydrocarbon gases  

DOE Patents (OSTI)

This invention describes a process for regeneration of halocarbon bearing carbonaceous adsorbents through which a carbonaceous adsorbent is contacted with hydrocarbon gases, preferably propane, butane and pentane at near room temperatures and at atmospheric pressure. As the hydrocarbon gases come in contact with the adsorbent, the hydrocarbons displace the halocarbons by physical adsorption. As a result of using this process, the halocarbon concentration and the hydrocarbon eluant is increased thereby allowing for an easier recovery of pure halocarbons. By using the process of this invention, carbonaceous adsorbents can be regenerated by an inexpensive process which also allows for subsequent re-use of the recovered halocarbons.

Senum, Gunnar I. (Patchogue, NY); Dietz, Russell N. (Patchogue, NY)

1994-01-01T23:59:59.000Z

200

Carbonaceous adsorbent regeneration and halocarbon displacement by hydrocarbon gases  

DOE Patents (OSTI)

This invention describes a process for regeneration of halocarbon bearing carbonaceous adsorbents through which a carbonaceous adsorbent is contacted with hydrocarbon gases, preferably propane, butane and pentane at near room temperatures and at atmospheric pressure. As the hydrocarbon gases come in contact with the adsorbent, the hydrocarbons displace the halocarbons by physical adsorption. As a result of using this process, the halocarbon concentration and the hydrocarbon eluant is increased thereby allowing for an easier recovery of pure halocarbons. By using the process of this invention, carbonaceous adsorbents can be regenerated by an inexpensive process which also allows for subsequent re-use of the recovered halocarbons. 8 figures.

Senum, G.I.; Dietz, R.N.

1994-04-05T23:59:59.000Z

Note: This page contains sample records for the topic "acoustics displacement flow" 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

Dual excitation acoustic paramagnetic logging tool  

DOE Patents (OSTI)

New methods and apparatus are disclosed which allow measurement of the presence of oil and water in geological formations using a new physical effect called the Acoustic Paramagnetic Logging Effect (APLE). The presence of petroleum in formation causes a slight increase in the earth's magnetic field in the vicinity of the reservoir. This is the phenomena of paramagnetism. Application of an acoustic source to a geological formation at the Larmor frequency of the nucleons present causes the paramagnetism of the formation to disappear. This results in a decrease in the earth's magnetic field in the vicinity of the oil bearing formation. Repetitively frequency sweeping the acoustic source through the Larmor frequency of the nucleons present (approx. 2 kHz) causes an amplitude modulation of the earth's magnetic field which is a consequence of the APLE. The amplitude modulation of the earth's magnetic field is measured with an induction coil gradiometer and provides a direct measure of the amount of oil and water in the excitation zone of the formation. The phase of the signal is used to infer the longitudinal relaxation times of the fluids present, which results in the ability in general to separate oil and water and to measure the viscosity of the oil present. Such measurements may be performed in open boreholes and in cased well bores. The Dual Excitation Acoustic Paramagnetic Logging Tool employing two acoustic sources is also described. 6 figs.

Vail, W.B. III.

1989-02-14T23:59:59.000Z

202

Dual excitation acoustic paramagnetic logging tool  

DOE Patents (OSTI)

New methods and apparatus are disclosed which allow measurement of the presence of oil and water in gelogical formations using a new physical effect called the Acoustic Paramagnetic Logging Effect (APLE). The presence of petroleum in formation causes a slight increase in the earth's magnetic field in the vicinity of the reservoir. This is the phenomena of paramagnetism. Application of an acoustic source to a geological formation at the Larmor frequency of the nucleous present causes the paramagnetism of the formation to disappear. This results in a decrease in the earth's magnetic field in the vicinity of the oil bearing formation. Repetitively frequency sweeping the acoustic source through the Larmor frequency of the nucleons present (approx. 2 kHz) causes an amplitude modulation of the earth's magnetic field which is a consequence of the APLE. The amplitude modulation of the earth's magnetic field is measured with an induction coil gradiometer and provides a direct measure of the amount of oil and water in the excitation zone of the formation. The phase of the signal is used to infer the longitudinal relaxation times of the fluids present, which results in the ability in general to separate oil and water and to measure the viscosity of the oil present. Such measurements may be preformed in open boreholes and in cased well bores. The Dual Excitation Acoustic Paramagnetic Logging Tool employing two acoustic sources is also described.

Vail, III, William B. (Bothell, WA)

1989-01-01T23:59:59.000Z

203

Performance comparison of fiber tips in interferometric displacement mesurements  

SciTech Connect

Fiber optic displacement sensors have many potential advantages over traditional displacement measurement techniques, including small size, immunity to electromagnetic interference, electrical isolation, and high resolution. In this report, we focus on an interferometric fiber optic sensor, where the gap between the fiber tip and the device under test forms a Fabry-Perot resonant cavity. An optical interrogator measures the reflected intensity at wavelengths ranging from 1510 to 1590 nm. The spacing between resonant frequencies allows us to determine the distance from the tip to the device under test. We consider ferrule connector angled physical contact (FC/APC), ferrule connector ultra physical contact (FC/UPC) and unpolished cleaved tips and compare their influence on sensor performance. A plane wave propagation model is proposed for predicting tip effects. Comparisons are made on the basis of sensor measurement range, resolution, and sensitivity to changes in test conditions. In this paper, we discuss the experimental setup, detail our analysis, and present test results with recommendations for the applications of each tip.

Moro, Erik [Los Alamos National Laboratory; Grahn, Rick R [Los Alamos National Laboratory; Karimi, Hussain H [Los Alamos National Laboratory; Wilson, Kyle L [Los Alamos National Laboratory; Puckett, Anthony D [Los Alamos National Laboratory

2011-01-24T23:59:59.000Z

204

Performance comparison of fiber optic tips in interferrometric displacement measurement  

SciTech Connect

Fiber optic displacement sensors have many potential advantages over traditional displacement measurement techniques, including small size, immunity to electromagnetic interference, electrical isolation, and high resolution. In this report, we focus on an interferometric fiber optic sensor, where the gap between the fiber tip and the device under test forms a Fabry-Perot resonant cavity. An optical interrogator measures the reflected intensity at wavelengths ranging from 1510 to 1590 nm. The spacing between resonant frequencies allows us to determine the distance from the tip to the device under test. We consider ferrule connector angled physical contact (FC/APC), ferrule connector ultra physical contact (FC/UPC) and unpolished cleaved tips and compare their influence on sensor performance. A plane wave propagation model is proposed for predicting tip effects. Comparisons are made on the basis of sensor measurement range, resolution, and sensitivity to changes in test conditions. In this paper, we discuss the experimental setup, detail our analysis, and present test results with recommendations for the applications of each tip.

Moro, Erik A [Los Alamos National Laboratory; Puckett, Anthony D [Los Alamos National Laboratory; Grahn, Rick [UNM; Karimi, Hussain [UCSD; Wilson, Kyle [ROSE HULMAN INSTITUTE OT TECH.

2010-10-21T23:59:59.000Z

205

Three-phase immiscible displacement in heterogeneous petroleum reservoirs  

Science Conference Proceedings (OSTI)

We describe a fractional-step numerical procedure for the simulation of immiscible three-phase flow in heterogeneous porous media that takes into account capillary pressure and apply it to indicate the existence of a so-called "transitional" wave in ... Keywords: central difference scheme, heterogeneous reservoirs, mixed finite elements, operator splitting, three-phase flow

E. Abreu; J. Douglas, Jr.; F. Furtado; D. Marchesin; F. Pereira

2006-11-01T23:59:59.000Z

206

13.853 Computational Ocean Acoustics, Spring 2003  

E-Print Network (OSTI)

Wave equations for fluid and visco-elastic media. Wave-theory formulations of acoustic source radiation and seismo-acoustic propagation in stratified ocean waveguides. Wavenumber Integration and Normal Mode methods for ...

Schmidt, Henrik

207

Spatiotemporal processing and time-reversal for underwater acoustic communications  

E-Print Network (OSTI)

High-rate underwater acoustic communication can be achieved using transmitter/receiver arrays. Underwater acoustic channels can be characterized as rapidly time-varying systems that suffer severe Inter Symbol Interferences ...

Wang, Daniel Y

2005-01-01T23:59:59.000Z

208

Effects of Hydrogen on the Thermo-Acoustics Coupling Mechanisms...  

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

on the Thermo-Acoustics Coupling Mechanisms of Low-Swirl Injector Flames in a Model Gas Turbine Combustor Title Effects of Hydrogen on the Thermo-Acoustics Coupling...

209

SPARSE UNDERWATER ACOUSTIC IMAGING: A CASE STUDY Nikolaos Stefanakis  

E-Print Network (OSTI)

SPARSE UNDERWATER ACOUSTIC IMAGING: A CASE STUDY Nikolaos Stefanakis , Jacques Marchal , Valentin de Beaulieu 35042 Rennes Cedex, France ABSTRACT Underwater acoustic imaging is traditionally 3D underwater imaging using a newly built flexible-configuration sonar device. The computational

Paris-Sud XI, Université de

210

Polaris: A GPS-Navigated Ocean Acoustic Current Profiler  

Science Conference Proceedings (OSTI)

Results from an initial feasibility study to test whether Global Positioning System (GPS) navigation can be combined with more traditional acoustic methods to measure ocean current profiles are presented. A typical acoustic current profiler such ...

Kevin D. Leaman; Peter S. Vertes; Chris Rocken

1995-06-01T23:59:59.000Z

211

Development and Testing of the MIT Acoustic Levitation Test Facilities  

Science Conference Proceedings (OSTI)

Two acoustic levitation test facilities have been developed for cloud physics experimentation. These facilities utilize acoustic standing wave energy to suspend both solid and liquid objects in a contact-free environment. In the still-air ...

Victor D. Lupi; R. John Hansman

1991-08-01T23:59:59.000Z

212

Ultrafast photo-acoustic spectroscopy of super-cooled liquids  

E-Print Network (OSTI)

Picosecond laser ultrasonic techniques for acoustic wave generation and detection were adapted to probe longitudinal and transverse acoustic waves in liquids at gigahertz frequencies. The experimental effort was designed ...

Klieber, Christoph

2010-01-01T23:59:59.000Z

213

Theoretical Studies of Non-Newtonian and Newtonian Fluid Flow through Porous Media  

E-Print Network (OSTI)

of Multicomponent, Multiphase Displacement in Porous Media,"C. M. (1981) : Multiphase Flow in Porous Media, Technip,porous media can always be considered as a special case of the multiphase

Wu, Y.S.

1990-01-01T23:59:59.000Z

214

NASA Glenn Research Center Acoustical Testing Laboratory: Five year retrospective  

Science Conference Proceedings (OSTI)

In the five years since the NASA Glenn Research Center Acoustical Testing Laboratory (ATL) opened its doors in September

2005-01-01T23:59:59.000Z

215

Cooperative Schemes for Underwater Acoustic Communications (AQU 3)  

E-Print Network (OSTI)

Cooperative Schemes for Underwater Acoustic CommunicationsIntroduction: Underwater Cooperative CommunicationsMotivation Traditional underwater communications Used for

Madhavan Vajapeyam; Satish Vedantam; Urbashi Mitra

2006-01-01T23:59:59.000Z

216

An on-line acoustic fluorocarbon coolant mixture analyzer for the ATLAS silicon tracker  

SciTech Connect

The ATLAS silicon tracker community foresees an upgrade from the present octafluoro-propane (C{sub 3}F{sub 8}) evaporative cooling fluid - to a composite fluid with a probable 10-20% admixture of hexafluoro-ethane (C{sub 2}F{sub 6}). Such a fluid will allow a lower evaporation temperature and will afford the tracker silicon substrates a better safety margin against leakage current-induced thermal runaway caused by cumulative radiation damage as the luminosity profile at the CERN Large Hadron Collider increases. Central to the use of this new fluid is a new custom-developed speed-of-sound instrument for continuous real-time measurement of the C{sub 3}F{sub 8}/C{sub 2}F{sub 6} mixture ratio and flow. An acoustic vapour mixture analyzer/flow meter with new custom electronics allowing ultrasonic frequency transmission through gas mixtures has been developed for this application. Synchronous with the emission of an ultrasound 'chirp' from an acoustic transmitter, a fast readout clock (40 MHz) is started. The clock is stopped on receipt of an above threshold sound pulse at the receiver. Sound is alternately transmitted parallel and anti-parallel with the vapour flow for volume flow measurement from transducers that can serve as acoustic transmitters or receivers. In the development version, continuous real-time measurement of C{sub 3}F{sub 8}/C{sub 2}F{sub 6} flow and calculation of the mixture ratio is performed within a graphical user interface developed in PVSS-II, the Supervisory, Control and Data Acquisition standard chosen for LHC and its experiments at CERN. The described instrument has numerous potential applications - including refrigerant leak detection, the analysis of hydrocarbons, vapour mixtures for semiconductor manufacture and anesthetic gas mixtures. (authors)

Bates, R. [Dept. of Physics and Astronomy, Univ. of Glasgow, G12 8QQ (United Kingdom); Battistin, M. [CERN, 1211 Geneva 23 (Switzerland); Berry, S.; Bitadze, A. [Dept. of Physics and Astronomy, Univ. of Glasgow, G12 8QQ (United Kingdom); Bonneau, P. [CERN, 1211 Geneva 23 (Switzerland); Bousson, N. [Centre de Physique des Particules de Marseille, 163 Avenue de Luminy, 13288 Marseille Cedex 09 (France); Boyd, G. [Dept. of Physics and Astronomy, Univ. of Oklahoma, Norman, OK 73019 (United States); Botelho-Direito, J.; DiGirolamo, B. [CERN, 1211 Geneva 23 (Switzerland); Doubek, M. [Czech Technical Univ., Technicka 4, 166 07 Prague 6 (Czech Republic); Egorov, K. [Physics Dept., Indiana Univ., Bloomington, IN 47405 (United States); Godlewski, J. [CERN, 1211 Geneva 23 (Switzerland); Hallewell, G. [Centre de Physique des Particules de Marseille, 163 Avenue de Luminy, 13288 Marseille Cedex 09 (France); Katunin, S. [B.P. Konstantinov Petersburg Nuclear Physics Inst. PNPI, 188300 St. Petersburg (Russian Federation); Mathieu, M.; McMahon, S. [Rutherford Appelton Laboratory - Science and Technology Facilities Council, Chilton, Didcot OX11 OQX (United Kingdom); Nagai, K. [Graduate School of Pure and Applied Sciences, Univ. of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577 (Japan); Perez-Rodriguez, E. [CERN, 1211 Geneva 23 (Switzerland); Rozanov, A. [Centre de Physique des Particules de Marseille, 163 Avenue de Luminy, 13288 Marseille Cedex 09 (France); Vacek, V.; Vitek, M. [Czech Technical Univ., Technicka 4, 166 07 Prague 6 (Czech Republic)

2011-07-01T23:59:59.000Z

217

Acoustic Propagation Prediction in Shallow Water  

E-Print Network (OSTI)

An acoustic propagation experiment was conducted on 17 May 2000 in a shallow water site off the Perth metropolitan coast with the view of obtaining reflection and refraction data to contribute to developing a geoacoustic model of the area. The site proposed has constant bathymetry, though the geological properties of the site are not well known. The experiment used two hydrophones, one situated mid-water and the other moored to the seabed to explore the possibility of receiving head waves. The acoustic sources used were a 20-cui air gun and imploding sources comprising 60W and 75W light globes and purpose built evacuated spheres.

Justin Hoffman John; John D. Penrose; Darryl R. Mcmahon

2000-01-01T23:59:59.000Z

218

Ion acoustic shock waves in degenerate plasmas  

SciTech Connect

Korteweg de Vries Burgers equation for negative ion degenerate dissipative plasma has been derived using reductive perturbation technique. The quantum hydrodynamic model is used to study the quantum ion acoustic shock waves. The effects of different parameters on quantum ion acoustic shock waves are studied. It is found that quantum parameter, electrons Fermi temperature, temperature of positive and negative ions, mass ratio of positive to negative ions, viscosity, and density ratio have significant impact on the shock wave structure in negative ion degenerate plasma.

Akhtar, N. [Theoretical Plasma Physics Division, PINSTECH, Nilore, Islamabad 44000 Pakistan (Pakistan); Hussain, S. [Theoretical Plasma Physics Division, PINSTECH, Nilore, Islamabad 44000 Pakistan (Pakistan); Department of Physics and Applied Mathematics, PIEAS, Nilore, Islamabad 44000 Pakistan (Pakistan)

2011-07-15T23:59:59.000Z

219

Acoustic microscope surface inspection system and method  

DOE Patents (OSTI)

An acoustic microscope surface inspection system and method in which pulses of high frequency electrical energy are applied to a transducer which forms and focuses acoustic energy onto a selected location on the surface of an object and receives energy from the location and generates electrical pulses. The phase of the high frequency electrical signal pulses are stepped with respected to the phase of a reference signal at said location. An output signal is generated which is indicative of the surface of said selected location. The object is scanned to provide output signals representative of the surface at a plurality of surface locations.

Khuri-Yakub, Butrus T. (Palo Alto, CA); Parent, Philippe (Chilly-Mazarin, FR); Reinholdtsen, Paul A. (Seattle, WA)

1991-01-01T23:59:59.000Z

220

Electron-acoustic vortices in multicomponent magnetoplasma  

Science Conference Proceedings (OSTI)

Linear and nonlinear properties of electron-acoustic waves in a multicomponent magnetoplasma comprising of cold and beam electrons and two species of thermal unmagnetized ions are investigated here. It is found that the electron beam velocity, electron Debye length, electron Larmor radius, and concentration of the cold and beam electrons affect the linear dispersion characteristics of electron-acoustic wave. It is also found that such a multicomponent plasma admits dipolar and vortex street type structures for the normalized electrostatic potential PHIgeomagnetic tail, etc. is also pointed out.

Haque, Q. [Theoretical Plasma Physics Division, PINSTECH, P. O. Nilore, Islamabad 45320 (Pakistan); Mirza, Arshad M. [Department of Physics, Theoretical Plasma Physics Group, Quaid-i-Azam University, Islamabad 45320 (Pakistan); Nargis, Shahida [Department of Mathematics, Quaid-i-Azam University, Islamabad 45320 (Pakistan)

2010-05-15T23:59:59.000Z

Note: This page contains sample records for the topic "acoustics displacement flow" 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

Point interactions in acoustics: one dimensional models  

E-Print Network (OSTI)

A one dimensional system made up of a compressible fluid and several mechanical oscillators, coupled to the acoustic field in the fluid, is analyzed for different settings of the oscillators array. The dynamical models are formulated in terms of singular perturbations of the decoupled dynamics of the acoustic field and the mechanical oscillators. Detailed spectral properties of the generators of the dynamics are given for each model we consider. In the case of a periodic array of mechanical oscillators it is shown that the energy spectrum presents a band structure.

C. Cacciapuoti; R. Figari; A. Posilicano

2005-04-28T23:59:59.000Z

222

Underwater acoustic imaging: physically-motivated sparse models  

E-Print Network (OSTI)

Underwater acoustic imaging: physically-motivated sparse models and validation on real data N hal-00677287,version1-4Jun2012 #12;Underwater acoustic imaging (UWA)hal-00677287,version1-4Jun2012 #12;Underwater acoustic imaging: direct problem Successive emission sequences, or pings, indexed by p. ep

Paris-Sud XI, Université de

223

Proceedings of the 11 European Conference on Underwater Acoustics  

E-Print Network (OSTI)

Proceedings of the 11 th European Conference on Underwater Acoustics INCOHERENT CHANGE DETECTION on Underwater Acoustics images. This allows performing a segmentation of the master image at the coarser stage,version1-7Sep2012 #12;Proceedings of the 11 th European Conference on Underwater Acoustics The idea

Paris-Sud XI, Université de

224

Distribution of small dispersive coal dust particles and absorbed radioactive chemical elements in conditions of forced acoustic resonance in iodine air filter at nuclear power plant  

E-Print Network (OSTI)

The physical features of distribution of the small dispersive coal dust particles and the adsorbed radioactive chemical elements and their isotopes in the absorber with the granular filtering medium with the cylindrical coal granules were researched in the case of the intensive air dust aerosol stream flow through the iodine air filter (IAF). It was shown that, at the certain aerodynamic conditions in the IAF, the generation of the acoustic oscillations is possible. It was found that the acoustic oscillations generation results in an appearance of the standing acoustic waves of the air pressure (density) in the IAF. In the case of the intensive blow of the air dust aerosol, it was demonstrated that the standing acoustic waves have some strong influences on both: 1) the dynamics of small dispersive coal dust particles movement and their accumulation in the IAF; 2) the oversaturation of the cylindrical coal granules by the adsorbed radioactive chemical elements and their isotopes in the regions, where the antin...

Ledenyov, Oleg P

2013-01-01T23:59:59.000Z

225

Multiphase Flow and Cavern Abandonment in Salt  

Science Conference Proceedings (OSTI)

This report will explore the hypothesis that an underground cavity in gassy salt will eventually be gas filled as is observed on a small scale in some naturally occurring salt inclusions. First, a summary is presented on what is known about gas occurrences, flow mechanisms, and cavern behavior after abandonment. Then, background information is synthesized into theory on how gas can fill a cavern and simultaneously displace cavern fluids into the surrounding salt. Lastly, two-phase (gas and brine) flow visualization experiments are presented that demonstrate some of the associated flow mechanisms and support the theory and hypothesis that a cavity in salt can become gas filled after plugging and abandonment

Ehgartner, Brian; Tidwell, Vince

2001-02-13T23:59:59.000Z

226

The Vroman effect: a molecular level description of fibrinogen displacement  

E-Print Network (OSTI)

Investigations of specific and nonspecific interactions of biomolecules at liquid/solid interfaces are presented. To investigate specific multivalent ligand-receptor interactions, bivalent antibodies and haptens bound to solid supported membrane were used as models for ligand-receptor coupling. Novel microfabrication strategies, which included spatially addressed bilayer arrays and heterogeneous microfluidic assays, in conjunction with total internal reflection microscopy, was employed to achieve this goal. These high throughput techniques allow thermodynamic data of binding interactions to be acquired with only a few microliters of analyte and superior signal to noise. The results yield both the first and second dissociation constant for bivalent IgG antibodies with membrane bound hapten molecules. Studies were conducted both as a function of hapten density and cholesterol content in the membrane. Another research area of this dissertation is the molecular level description of nonspecific adsorption and displacement of the model protein, fibrinogen, onto hydrophilic surfaces. Techniques such as atomic force microscopy, immunochemical assays, fluorescence microscopy, and vibrational sum frequency spectroscopy were employed to probe this system. The results demonstrate that the protein's ?C domains play the critical role. When fibrinogen is adsorbed to a hydrophilic surface via these moieties, its displacement rate in the presence of human plasma is approximately 170 times faster than when these domains are not in direct surface contact. Even more significantly, spectroscopic studies show evidence for highly aligned Arg and Lys residues interacting with the negatively charged substrate only when the ?C domains make direct surface contact. The interfacial ordering of these residues appears to be the hallmark of a weak and labile electrostatic attraction between the substrate and the adsorbed macromolecule.

Jung, Seung-Yong

2003-12-01T23:59:59.000Z

227

Effects of a Thermistor String Mounted between the Acoustic Beams of an Acoustic Doppler Current Profiler  

Science Conference Proceedings (OSTI)

A useful extension of upward-looking buoy-mounted acoustic Doppler current profilers (ADCPs), in particular for studying surface-mixed-layer dynamics from underneath, would be to combine them with a thermistor cable for obtaining simultaneous ...

Friedrich Schott

1988-02-01T23:59:59.000Z

228

Acoustic Radar Studies of Rain Microphysics  

Science Conference Proceedings (OSTI)

Raindrop size distributions are obtained from the Doppler frequency spectrum of an acoustic radar. Number concentrations of 12 drop diameters with a minimum diameter 0.14 cm are obtained and averaged over 3–15 min at 20-m range gates from 20 to ...

S. G. Bradley

1997-06-01T23:59:59.000Z

229

The Acoustic Properties of Different Noise Sources  

Science Conference Proceedings (OSTI)

This paper discusses a method to find the acoustic properties of different types of background noise: highway, airport, subway, restaurant, rain, inside a car, and inside a train. Four parameters are calculated using the Auto Correlation Function (ACF). ... Keywords: Environmental noise, noise classification

Jidong Yang; Buket D. Barkana

2009-04-01T23:59:59.000Z

230

Uncanny soundscapes: Towards an inoperative acoustic community  

Science Conference Proceedings (OSTI)

Drawing on field research carried out in the abandoned villages of the Ara Valley, this article seeks to readdress notions of acoustic community and communication in terms of a 'haptic aurality' in which listening, as a mode of touch, approximates a ...

Iain Foreman

2011-12-01T23:59:59.000Z

231

Local helioseismic and spectroscopic analyses of interactions between acoustic waves and a sunspot  

E-Print Network (OSTI)

Using a high cadence imaging spectropolarimetric observation of a sunspot and its surroundings in magnetically sensitive (FeI 6173 A) and insensitive (FeI 7090 A) upper photospheric absorption lines, we map the instantaneous wave phases and helioseismic travel times as a function of observation height and inclination of magnetic field to the vertical. We confirm the magnetic inclination angle dependent transmission of incident acoustic waves into upward propagating waves, and derive (1) proof that helioseismic travel times receive direction dependent contributions from such waves and hence cause errors in conventional flow inferences, (2) evidences for acoustic wave sources beneath the umbral photosphere, and (3) significant differences in travel times measured from the chosen magnetically sensitive and insensitive spectral lines.

Rajaguru, S P; Sankarasubramanian, K; Couvidat, S; 10.1088/2041-8205/721/2/L86

2010-01-01T23:59:59.000Z

232

Cross-Dipole Acoustic Log | Open Energy Information  

Open Energy Info (EERE)

Cross-Dipole Acoustic Log Cross-Dipole Acoustic Log Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Cross-Dipole Acoustic Log Details Activities (1) Areas (1) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Downhole Techniques Exploration Sub Group: Well Log Techniques Parent Exploration Technique: Acoustic Logs Information Provided by Technique Lithology: Stratigraphic/Structural: Rock stress and fracture analysis Hydrological: Use for fracture identification in open and cased holes. Also used for evaluating hydro fracturing/well stimulation effectiveness. Thermal: Dictionary.png Cross-Dipole Acoustic Log: An acoustic logging technique where the acoustic transmitter and receivers are lowered down hole and waveforms that travel through the well mud,

233

Regeneration of strong-base anion-exchange resins by sequential chemical displacement  

DOE Patents (OSTI)

A method for regenerating strong-base anion exchange resins utilizing a sequential chemical displacement technique with new regenerant formulation. The new first regenerant solution is composed of a mixture of ferric chloride, a water-miscible organic solvent, hydrochloric acid, and water in which tetrachloroferrate anion is formed and used to displace the target anions on the resin. The second regenerant is composed of a dilute hydrochloric acid and is used to decompose tetrachloroferrate and elute ferric ions, thereby regenerating the resin. Alternative chemical displacement methods include: (1) displacement of target anions with fluoroborate followed by nitrate or salicylate and (2) displacement of target anions with salicylate followed by dilute hydrochloric acid. The methodology offers an improved regeneration efficiency, recovery, and waste minimization over the conventional displacement technique using sodium chloride (or a brine) or alkali metal hydroxide.

Brown, Gilbert M. (Knoxville, TN); Gu, Baohua (Oak Ridge, TN); Moyer, Bruce A. (Oak Ridge, TN); Bonnesen, Peter V. (Knoxville, TN)

2002-01-01T23:59:59.000Z

234

Investigation of Multiscale and Multiphase Flow, Transport and Reaction in Heavy Oil Recovery Processes  

Science Conference Proceedings (OSTI)

In this report, the thrust areas include the following: Internal drives, vapor-liquid flows, combustion and reaction processes, fluid displacements and the effect of instabilities and heterogeneities and the flow of fluids with yield stress. These find respective applications in foamy oils, the evolution of dissolved gas, internal steam drives, the mechanics of concurrent and countercurrent vapor-liquid flows, associated with thermal methods and steam injection, such as SAGD, the in-situ combustion, the upscaling of displacements in heterogeneous media and the flow of foams, Bingham plastics and heavy oils in porous media and the development of wormholes during cold production.

Yortsos, Yanis C.

2002-10-08T23:59:59.000Z

235

Engineering of Schroedinger cat states by a sequence of displacements and photon additions or subtractions  

SciTech Connect

A method to generate Schroedinger cat states in free propagating optical fields based on the use of displaced states (or displacement operators) is developed. Some optical schemes with photon-added coherent states are studied. The schemes are modifications of the general method based on a sequence of displacements and photon additions or subtractions adjusted to generate Schroedinger cat states of a larger size. The effects of detection inefficiency are taken into account.

Podoshvedov, S. A., E-mail: podoshvedov@mail.ru [Seoul National University, Center for Subwavelength Optics and Department of Physics and Astronomy (Korea, Republic of)

2011-04-15T23:59:59.000Z

236

Impacts of Electric Vehicles on Primary Energy Consumption and Petroleum Displacement  

E-Print Network (OSTI)

and New York. Weestimate petroleum displacement by EVs forb b c 1990 Marginal mix Coal Petroleum NG Nuclear a Dthershydropower° geothermal, petroleum coke,biomass, wood,waste,

Wang, Quanlu; Delucchi, Mark A.

1991-01-01T23:59:59.000Z

237

Anomalous recovery of damped radial modes in a circular?sector duct with locally heated flow  

Science Conference Proceedings (OSTI)

It is often desirable to predict acoustic propagation in a circular duct carrying a locally heated flow. Common examples include jet engines and certain industrial and commercial burners whose combustion?related noise can be an environmental problem if allowed to penetrate into the surroundings. In these cases axial gradients in the steady flow variables

J. R. Maham; S.?Y. Yeh

1984-01-01T23:59:59.000Z

238

Argonne Acoustic Levitation Video Goes Viral  

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

"Inside the Advanced Photon Source" Inside the latest Argonne Now "Inside the Advanced Photon Source" Inside the latest Argonne Now APS Director Stephenson Named Argonne Distinguished Fellow Advanced Photon Source, Canadian Light Source Strengthen Ties, Expand X-ray Technology and Research Rose of APS and CNM One of Four DOE Early Career Award Winners Scientists Close-In on Artificial Spider Silk APS News Archives: 2012 | 2011 | 2010 | 2009 2008 | 2007 | 2006 | 2005 2004 | 2003 | 2002 | 2001 2000 Subscribe to APS News rss feed Argonne Acoustic Levitation Video Goes Viral SEPTEMBER 25, 2012 Bookmark and Share Drops of solution being suspended for a long period of time, thanks to the vibrational force of sound waves that keep them stationary in an air column. More than 41,000 Google hits for "acoustic levitation Argonne" as of

239

Definition: Acoustic Televiewer | Open Energy Information  

Open Energy Info (EERE)

Televiewer Televiewer Jump to: navigation, search Dictionary.png Acoustic Televiewer The Acoustic Televiewer (ATV) log provides a very-high resolution, sonic image of the borehole wall. The tool consists of an ultrasonic transducer coupled with a downhole inclinometer. These devices are used to generate an oriented image of seismic velocity variation and wave amplitude. These images are then examined and highlighted to reveal fractures, bedding planes and orientation of those features. The log is useful for strata and fracture delineation, and can also be used to evaluate compressional-wave velocity, borehole deviation and eccentricity.[1] References ↑ http://www.dot.ca.gov/hq/esc/geotech/gg/atv_log.htm Ret LikeLike UnlikeLike You like this.Sign Up to see what your friends like.

240

Acoustic data transmission through a drillstring  

DOE Patents (OSTI)

A method and apparatus for acoustically transmitting data along a drillstring is presented. In accordance with one embodiment of the present invention, acoustic data signals are conditioned to counteract distortions caused by the drillstring. Preferably, this conditioning step comprises multiplying each frequency component of the data signal by exp (-ikL) where L is the transmission length of the drillstring, k is the wave number in the drillstring at the frequency of each component and i is (-1).sup.1/2. In another embodiment of this invention, data signals having a frequency content in at least one passband of the drillstring are generated preferably traveling in only one direction (e.g., up the drillstring) while echoes in the drillstring resulting from the data transmission are suppressed.

Drumheller, Douglas S. (Cedar Crest, NM)

1992-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "acoustics displacement flow" 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

Acoustic data transmission through a drillstring  

DOE Patents (OSTI)

A method and apparatus for acoustically transmitting data along a drillstring are presented. In accordance with one embodiment of the present invention, acoustic data signals are conditioned to counteract distortions caused by the drillstring. Preferably, this conditioning step comprises multiplying each frequency component of the data signal by exp ([minus]ikL) where L is the transmission length of the drillstring, k is the wave number in the drillstring at the frequency of each component and i is ([minus]1)[sup 1/2]. In another embodiment of this invention, data signals having a frequency content in at least one passband of the drillstring are generated preferably traveling in only one direction (e.g., up the drillstring) while echoes in the drillstring resulting from the data transmission are suppressed. 20 figs.

Drumheller, D.S.

1992-07-07T23:59:59.000Z

242

Pulse combusted acoustic agglomeration apparatus and process  

SciTech Connect

An improved apparatus and process for removal of particulates entrained in a gas stream are provided. The removal process employs a pulse combustor to provide an acoustic pressure wave to acoustically enhance bimodal agglomeration of particulates which may be collected and removed using a conventional separation apparatus. A particulate having a size different from the size of the particulate in the gas stream to be cleaned is introduced into the system to effectuate the bimodal process. The apparatus may be employed as a direct fired system for improved operation of gas-operated equipment such as a gas turbine, or may, alternatively, be employed as an add-on subsystem for combustion exhaust clean-up. Additionally, the added particulate may be a sorbent for effecting sorption of other contaminants such as sulfur. Various other particulates for contaminant removal may also be introduced into the system as exemplified by alkali-gettering agents.

Mansour, Momtaz N. (Columbia, MD)

1993-01-01T23:59:59.000Z

243

Pulse combusted acoustic agglomeration apparatus and process  

SciTech Connect

An improved apparatus and process for removal of particulates entrained in a gas stream are provided. The removal process employs a pulse combustor to provide an acoustic pressure wave to acoustically enhance agglomeration of particulates which may be collected and removed using a conventional separation apparatus. The apparatus may be employed as a direct fired system for improved operation of gas-operated equipment such as a gas turbine, or may, alternatively, be employed as an add-on subsystem for combustion exhaust clean-up. Additionally, added particulates may include a sorbent for effecting sorption of other contaminants such as sulfur. Various other particulates for contaminant removal may also be introduced into the system as exemplified by alkali-gettering agents.

Mansour, Momtaz N. (Columbia, MD); Chandran, Ravi (Ellicott City, MD)

1994-01-01T23:59:59.000Z

244

NW-MILO Acoustic Data Collection  

SciTech Connect

There is an enduring requirement to improve our ability to detect potential threats and discriminate these from the legitimate commercial and recreational activity ongoing in the nearshore/littoral portion of the maritime domain. The Northwest Maritime Information and Littoral Operations (NW-MILO) Program at PNNL’s Coastal Security Institute in Sequim, Washington is establishing a methodology to detect and classify these threats - in part through developing a better understanding of acoustic signatures in a near-shore environment. The purpose of the acoustic data collection described here is to investigate the acoustic signatures of small vessels. The data is being recorded continuously, 24 hours a day, along with radar track data and imagery. The recording began in August 2008, and to date the data contains tens of thousands of signals from small vessels recorded in a variety of environmental conditions. The quantity and variety of this data collection, with the supporting imagery and radar track data, makes it particularly useful for the development of robust acoustic signature models and advanced algorithms for signal classification and information extraction. The underwater acoustic sensing system is part of a multi-modal sensing system that is operating near the mouth of Sequim Bay. Sequim Bay opens onto the Straight of Juan de Fuca, which contains part of the border between the U.S. and Canada. Table 1 lists the specific components used for the NW-MILO system. The acoustic sensor is a hydrophone permanently deployed at a mean depth of about 3 meters. In addition to a hydrophone, the other sensors in the system are a marine radar, an electro-optical (EO) camera and an infra-red (IR) camera. The radar is integrated with a vessel tracking system (VTS) that provides position, speed and heading information. The data from all the sensors is recorded and saved to a central server. The data has been validated in terms of its usability for characterizing the signatures of small vessels. The sampling rate of 8 kHz and low pass filtering to 2 kHz results in an alias-free signal in the frequency band that is appropriate for small vessels. Calibration was performed using a Lubell underwater speaker so that the raw data signal levels can be converted to sound pressure. Background noise is present due to a nearby pump and as a result of tidal currents. More study is needed to fully characterize the noise, but it does not pose an obstacle to using the acoustic data for the purposes of vessel detection and signature analysis. The detection range for a small vessel was estimated using the calibrated voltage response of the system and a cylindrical spreading model for transmission loss. The sound pressure of a typical vessel with an outboard motor was found to be around 140 dB mPa, and could theoretically be detected from 10 km away. In practical terms, a small vessel could reliably be detected from 3 - 5 km away. The data is archived in netCDF files, a standard scientific file format that is "self describing". This means that each data file contains the metadata - timestamps, units, origin, etc. - needed to make the data meaningful and portable. Other file formats, such as XML, are also supported. A visualization tool has been developed to view the acoustic data in the form of spectrograms, along with the coincident radar track data and camera images.

Matzner, Shari; Myers, Joshua R.; Maxwell, Adam R.; Jones, Mark E.

2010-02-17T23:59:59.000Z

245

Acoustic enhancement for photo detecting devices  

DOE Patents (OSTI)

Provided are improvements to photo detecting devices and methods for enhancing the sensitivity of photo detecting devices. A photo detecting device generates an electronic signal in response to a received light pulse. An electro-mechanical acoustic resonator, electrically coupled to the photo detecting device, damps the electronic signal and increases the signal noise ratio (SNR) of the electronic signal. Increased photo detector standoff distances and sensitivities will result.

Thundat, Thomas G; Senesac, Lawrence R; Van Neste, Charles W

2013-02-19T23:59:59.000Z

246

Silent Positioning in Underwater Acoustic Sensor Networks  

E-Print Network (OSTI)

In this paper, we present a silent positioning scheme termed as UPS for underwater acoustic sensor networks. UPS relies on the time-difference of arrivals measured locally at a sensor to detect range differences from the sensor to four anchor nodes. These range differences are averaged over multiple beacon intervals before they are combined to estimate the 3D sensor location through trilateration. UPS requires no time-synchronization and provides location privacy at underwater vehicles/sensors whose locations need to be determined. To study the performance of UPS, we model the underwater acoustic channel as a modified Ultra Wide Band (UWB) S-V model: the arrival of each path cluster and paths within each cluster follow double Poisson distributions, and the multipath channel gain follows a Rician distribution. Based on this channel model, we perform both theoretical analysis and simulation study on the position error of UPS under acoustic fading channels. The obtained results indicate that UPS is an effective scheme for underwater vehicle/sensor self-positioning.

Xiuzhen Cheng; Haining Shu; Qilian Liang; David Hung-chang Du

2007-01-01T23:59:59.000Z

247

A Displacement-Based Error Measure Applied in a Regional Ensemble Forecasting System  

Science Conference Proceedings (OSTI)

Errors in regional forecasts often take the form of phase errors, where a forecasted weather system is displaced in space or time. For such errors, a direct measure of the displacement is likely to be more valuable than traditional measures. A ...

Christian Keil; George C. Craig

2007-09-01T23:59:59.000Z

248

DNA hybridization kinetics: zippering, internal displacement and sequence dependence  

E-Print Network (OSTI)

While the thermodynamics of DNA hybridization is well understood, much less is known about the kinetics of this classic system. Filling this gap in our understanding has new urgency because DNA nanotechnology often depends critically on binding rates. Here we use a coarse-grained model to explore the hybridization kinetics of DNA oligomers, finding that strand association proceeds through a complex set of intermediate states. Successful binding events start with the formation of a few metastable base-pairing interactions, followed by zippering of the remaining bonds. However, despite reasonably strong interstrand interactions, initial contacts frequently fail to lead to zippering because the typical configurations in which they form differ from typical states of similar enthalpy in the double-stranded equilibrium ensemble. Therefore, if the association process is analyzed on the base-pair (secondary structure) level, it shows non-Markovian behavior. Initial contacts must be stabilized by two or three base pairs before full zippering is likely, resulting in negative effective activation enthalpies. Non-Arrhenius behavior is observed as the number of base pairs in the effective transition state increases with temperature. In addition, we find that alternative pathways involving misbonds can increase association rates. For repetitive sequences, misaligned duplexes frequently rearrange to form fully paired duplexes by two distinct processes which we label `pseudoknot' and `inchworm' internal displacement. We show how the above processes can explain why experimentally observed association rates of GC-rich oligomers are higher than rates of AT-rich equivalents. More generally, we argue that association rates can be modulated by sequence choice.

Thomas E. Ouldridge; Petr Šulc; Flavio Romano; Jonathan P. K. Doye; Ard A. Louis

2013-03-14T23:59:59.000Z

249

Underwater Acoustic Detection of Ultra High Energy Neutrinos  

E-Print Network (OSTI)

We investigate the acoustic detection method of 10^18-20 eV neutrinos in a Mediterranean Sea environment. The acoustic signal is re-evaluated according to dedicated cascade simulations and a complex phase dependant absorption model, and compared to previous studies. We detail the evolution of the acoustic signal as function of the primary shower characteristics and of the acoustic propagation range. The effective volume of detection for a single hydrophone is given taking into account the limitations due to sea bed and surface boundaries as well as refraction effects. For this 'benchmark detector' we present sensitivity limits to astrophysical neutrino fluxes, from which sensitivity bounds for a larger acoustic detector can be derived. Results suggest that with a limited instrumentation the acoustic method would be more efficient at extreme energies, above 10^20 eV.

V. Niess; V. Bertin

2005-11-21T23:59:59.000Z

250

Centrifugal and Positive Displacement Charging Pump Maintenance Guide  

Science Conference Proceedings (OSTI)

In pressurized water reactors, charging pumps provide charging flow to the RCS and are also required to be available in the event of a loss of coolant accident (LOCA) event. Pump availability combined with modes of operation have made pump maintenance both frequent and costly. This report provides techniques to assist utilities in reducing maintenance costs for these pumps. Areas for improving reliability of these pumps include: excessive seal leakage, definition of acceptable seal leakage, packing life,...

1996-12-31T23:59:59.000Z

251

www.hicn.org Displacement and Education of the Next Generation: Evidence from Bosnia and Herzegovina  

E-Print Network (OSTI)

Abstract: In this paper, I study how displacement of parents during a violent conflict affects investment in their children’s ' education years later. Using ethnic division during the Bosnian War as a natural experiment, I can identify exogenously displaced households and compare them to households who did not have to move because of the war. I find that displaced households spend significantly less on the education of their children in primary and secondary school (20 to 35 %), while their children are equally likely to be enrolled. The result also holds for expenditure positions like textbooks, school materials and annual tuition in secondary school. A decomposition of the causal effect shows that differences in income and the stock of durable goods can at most explain one third of the finding. Some evidence points towards increased uncertainty about the future of displaced parents. The finding implies that the disadvantage of displacement might be carried on to the next generation through the quality of education.

Christoph Eder

2013-01-01T23:59:59.000Z

252

Electret Acoustic Transducer Array For Computerized Ultrasound Risk Evaluation System  

DOE Patents (OSTI)

An electret-based acoustic transducer array is provided and may be used in a system for examining tissue. The acoustic transducer array is formed with a substrate that has a multiple distinct cells formed therein. Within each of the distinct cells is positioned an acoustic transducing element formed of an electret material. A conductive membrane is formed over the distinct cells and may be flexible.

Moore, Thomas L. (Livermore, CA); Fisher, Karl A. (Brentwood, CA)

2005-08-09T23:59:59.000Z

253

Tempest Simulations of Collisionless Damping of the Geodesic-Acoustic Mode in Edge-Plasma Pedestals  

SciTech Connect

The fully nonlinear (full-f) four-dimensional TEMPEST gyrokinetic continuum code correctly produces the frequency and collisionless damping of geodesic-acoustic modes (GAMs) and zonal flow, with fully nonlinear Boltzmann electrons for the inverse aspect ratio {epsilon} scan and the tokamak safety factor q scan in homogeneous plasmas. TEMPEST simulations show that the GAMs exist in the edge pedestal for steep density and temperature gradients in the form of outgoing waves. The enhanced GAM damping may explain experimental beam emission spectroscopy measurements on the edge q scaling of the GAM amplitude.

Xu, X. Q.; Xiong, Z.; Nevins, W. M. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Gao, Z. [Department of Engineering Physics, Tsinghua University, Beijing 100084 (China); McKee, G. R. [University of Wisconsin-Madison, Wisconsin 53706 (United States)

2008-05-30T23:59:59.000Z

254

TEMPEST Simulations of Collisionless Damping of Geodesic-Acoustic Mode in Edge Plasma Pedestal  

Science Conference Proceedings (OSTI)

The fully nonlinear 4D TEMPEST gyrokinetic continuum code produces frequency, collisionless damping of geodesic-acoustic mode (GAM) and zonal flow with fully nonlinear Boltzmann electrons for the inverse aspect ratio {epsilon}-scan and the tokamak safety factor q-scan in homogeneous plasmas. The TEMPEST simulation shows that GAM exists in edge plasma pedestal for steep density and temperature gradients, and an initial GAM relaxes to the standard neoclassical residual, rather than Rosenbluth-Hinton residual due to the presence of ion-ion collisions. The enhanced GAM damping explains experimental BES measurements on the edge q scaling of the GAM amplitude.

Xu, X; Xiong, Z; Nevins, W; McKee, G

2007-05-31T23:59:59.000Z

255

Underwater Acoustic Sensor Network with Energy Harvesting Nodes.  

E-Print Network (OSTI)

??This thesis explores the possibility of a self sustained and service free Underwater Acoustic Sensor Network (UASN). The network nodes are installed along a subsea… (more)

Huseby, Morten

2011-01-01T23:59:59.000Z

256

WIRELESS MICROWAVE ACOUSTIC SENSOR SYSTEM FOR CONDITION MONITORING...  

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

WIRELESS MICROWAVE ACOUSTIC SENSOR SYSTEM FOR CONDITION MONITORING IN POWER PLANT ENVIRONMENTS Project DE-FE0007379TDD NETL, Morgantown, WV, March 14, 2012. DOE NETL Program:...

257

Nondestructive acoustic electric field probe apparatus and method  

DOE Patents (OSTI)

The disclosure relates to a nondestructive acoustic electric field probe and its method of use. A source of acoustic pulses of arbitrary but selected shape is placed in an oil bath along with material to be tested across which a voltage is disposed and means for receiving acoustic pulses after they have passed through the material. The received pulses are compared with voltage changes across the material occurring while acoustic pulses pass through it and analysis is made thereof to determine preselected characteristics of the material.

Migliori, Albert (Santa Fe, NM)

1982-01-01T23:59:59.000Z

258

MAC and Routing Protocols for Mobile Underwater Acoustic Sensor Swarms  

E-Print Network (OSTI)

Pressure Routing for Underwater Sensor Networks . . . . . .of Aloha Protocols for Underwater Acoustic Sensor Networks.Critical Applications in Underwater Sensor Networks. In

Noh, Young Tae

2012-01-01T23:59:59.000Z

259

Use of an acoustic network as an underwater positioning system .  

E-Print Network (OSTI)

??Underwater acoustic networks provide an interface between UUVs and surface or land-based control systems. By exploiting range data measured incidental to communications on these networks… (more)

Reed, Michael S.

2006-01-01T23:59:59.000Z

260

Using Scanning Acoustic Microscopy to Study Subsurface Defects ...  

Science Conference Proceedings (OSTI)

The resolution of the reflection acoustic microscope is somewhat better than the resolution based on the Rayleigh criterion and is given by the equation6: ...

Note: This page contains sample records for the topic "acoustics displacement flow" from the National Library of EnergyBeta (NLEBeta).
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261

COMPARISON OF ACOUSTIC AND ELECTRICAL IMAGE LOGS FROM THE COSO...  

Open Energy Info (EERE)

fractures are difficult to identify in electrical image logs because of the low percentage of the borehole wall imaged. Analysis of induced structures in acoustic image logs...

262

High Frequency Acoustic Wave Scattering From Turbulent Premixed Flames .  

E-Print Network (OSTI)

??This thesis describes an experimental investigation of high frequency acoustic wave scattering from turbulent premixed flames. The objective of this work was to characterize the… (more)

Narra, Venkateswarlu

2008-01-01T23:59:59.000Z

263

Method and apparatus for adapting steady flow with cyclic thermodynamics  

DOE Patents (OSTI)

Energy transfer apparatus has a resonator for supporting standing acoustic waves at a selected frequency with a steady flow process fluid thermodynamic medium and a solid medium having heat capacity. The fluid medium and the solid medium are disposed within the resonator for thermal contact therebetween and for relative motion therebetween. The relative motion is produced by a first means for producing a steady velocity component and second means for producing an oscillating velocity component at the selected frequency and concomitant wavelength of the standing acoustic wave. The oscillating velocity and associated oscillating pressure component provide energy transfer between the steady flow process fluid and the solid medium as the steady flow process fluid moves through the resonator.

Swift, Gregory W. (Santa Fe, NM); Reid, Robert S. (Los Alamos, NM); Ward, William C. (Santa Fe, NM)

2000-01-01T23:59:59.000Z

264

ACOUSTICAL IMAGING AND MECHANICAL PROPERTIES OF SOFT ROCK AND MARINE SEDIMENTS  

SciTech Connect

The oil and gas industry has encountered significant problems in the production of oil and gas from weak rocks (such as chalks and limestones) and from unconsolidated sand formations. Problems include subsidence, compaction, sand production, and catastrophic shallow water sand flows during deep water drilling. Together these cost the petroleum industry hundreds of millions of dollars annually. The goals of this first quarterly report is to document the progress on the project to provide data on the acoustic imaging and mechanical properties of soft rock and marine sediments. The project is intended to determine the geophysical (acoustic velocities) rock properties of weak, poorly cemented rocks and unconsolidated sands. In some cases these weak formations can create problems for reservoir engineers. For example, it cost Phillips Petroleum 1 billion dollars to repair of offshore production facilities damaged during the unexpected subsidence and compaction of the Ekofisk Field in the North Sea (Sulak 1991). Another example is the problem of shallow water flows (SWF) occurring in sands just below the seafloor encountered during deep water drilling operations. In these cases the unconsolidated sands uncontrollably flow up around the annulus of the borehole resulting in loss of the drill casing. The $150 million dollar loss of the Ursa development project in the U.S. Gulf Coast resulted from an uncontrolled SWF (Furlow 1998a,b; 1999a,b). The first three tasks outlined in the work plan are: (1) obtain rock samples, (2) construct new acoustic platens, (3) calibrate and test the equipment. These have been completed as scheduled. Rock Mechanics Institute researchers at the University of Oklahoma have obtained eight different types of samples for the experimental program. These include: (a) Danian Chalk, (b) Cordoba Cream Limestone, (c) Indiana Limestone, (d) Ekofisk Chalk, (e) Oil Creek Sandstone, (f) unconsolidated Oil Creek sand, and (g) unconsolidated Brazos river sand. These weak rocks and sands are intended to represent analogs to the formations that present oil and gas engineers with problems during oil and gas production and drilling operations. A series of new axial acoustic sensors have been constructed (and tested) to allow measurement of compressional and shear wave velocities during high pressure triaxial tests on these weak rock and sand samples. In addition, equipment to be utilized over the next 18 months of the project have tested and calibrated. These include the load frames, triaxial pressure cells, pressure sensors, load cells, extensometers, and oscilloscopes have been calibrated and tested. The multichannel acoustic emission and acoustic pulse transmission systems have also been tested. Graduate research assistant, research faculty, and the laboratory technician have begun Tasks 4 and 5 which involve preparing the sand samples and rock samples for testing. The construction of the lateral acoustic sensors has also been started during this quarter as outlined in the project timeline. With the equipment having been tested and calibrated, and the samples now being prepared, the experiments are on schedule to be started in April, 2001.

Thurman E. Scott, Jr., Ph.D.; Musharraf Zaman, Ph.D.; Younane Abousleiman, Ph.D.

2001-04-01T23:59:59.000Z

265

Optimization of Concurrent Deployments of the Juvenile Salmon Acoustic Telemetry System and Other Hydroacoustic Equipment at John Day Dam  

DOE Green Energy (OSTI)

The purpose of this report is to document the results of the acoustic optimization study conducted at John Day Dam during January and February 2008. The goal of the study was to optimize performance of the Juvenile Salmon Acoustic Telemetry System (JSATS) by determining deployment and data acquisition methods to minimize electrical and acoustic interference from various other acoustic sampling devices. Thereby, this would allow concurrent sampling by active and passive acoustic methods during the formal evaluations of the prototype surface flow outlets at the dam during spring and summer outmigration seasons for juvenile salmonids. The objectives for the optimization study at John Day Dam were to: 1. Design and test prototypes and provide a total needs list of pipes and trolleys to deploy JSATS hydrophones on the forebay face of the powerhouse and spillway. 2. Assess the effect on mean percentage decoded of JSATS transmissions from tags arrayed in the forebay and detected on the hydrophones by comparing: turbine unit OFF vs. ON; spill bay OPEN vs. CLOSED; dual frequency identification sonar (DIDSON) and acoustic Doppler current profiler (ADCP) both OFF vs. ON at a spill bay; and, fixed-aspect hydroacoustic system OFF vs. ON at a turbine unit and a spill bay. 3. Determine the relationship between fixed-aspect hydroacoustic transmit level and mean percentage of JSATS transmissions decoded. The general approach was to use hydrophones to listen for transmissions from JSATS tags deployed in vertical arrays in a series perpendicular to the face of the dam. We used acoustic telemetry equipment manufactured by Technologic and Sonic Concepts. In addition, we assessed old and new JSATS signal detectors and decoders and two different types of hydrophone baffling. The optimization study consisted of a suite of off/on tests. The primary response variable was mean percentage of tag transmissions decoded. We found that there was no appreciable adverse effect on mean percentage decoded for JSATS transmitters from: turbine operations; spillway operations; DIDSON/ADCP acoustic energy; and PAS hydroacoustic systems at transmit level of -12 dB, although there was a significant impact at all higher transmit levels (-11 to -6 dB). The main conclusion from this optimization study is that valid JSATS telemetry data can be collected simultaneously with a DIDSON/ADCP and a PAS hydroacoustic system at transmit level -12 dB. Multiple evaluation tools should be considered to increase the robustness and thoroughness of future fish passage evaluations at John Day and other dams.

Ploskey, Gene R.; Hughes, James S.; Khan, Fenton; Kim, Jina; Lamarche, Brian L.; Johnson, Gary E.; Choi, Eric Y.; Faber, Derrek M.; Wilberding, Matthew C.; Deng, Zhiqun; Weiland, Mark A.; Zimmerman, Shon A.; Fischer, Eric S.; Cushing, Aaron W.

2008-09-01T23:59:59.000Z

266

Self-adaptive methods for acoustic focusing and mode extraction in a shallow ocean waveguide  

E-Print Network (OSTI)

1.1 Time-reversal in the shallow ocean . . . . . .applications versus ocean acoustic SONAR and communicationsH. Schmidt, Computational Ocean Acoustics, (AIP New York,

Walker, Shane C.

2005-01-01T23:59:59.000Z

267

Spectrally efficient underwater acoustic communications : channel characterization and design aspects for OFDM  

E-Print Network (OSTI)

with L = 9 for an underwater channel impulse response with Ladaptive modulation in underwater acoustic communications,”Adaptive OFDM for underwater acoustic channels with limited

Radoševi?, Andreja

2012-01-01T23:59:59.000Z

268

Effect of Body Mass Index on Intrafraction Prostate Displacement Monitored by Real-Time Electromagnetic Tracking  

Science Conference Proceedings (OSTI)

Purpose: To evaluate, using real-time monitoring of implanted radiofrequency transponders, the intrafraction prostate displacement of patients as a function of body mass index (BMI). Methods and Materials: The motions of Beacon radiofrequency transponders (Calypso Medical Technologies, Seattle, WA) implanted in the prostate glands of 66 men were monitored throughout the course of intensity modulated radiation therapy. Data were acquired at 10 Hz from setup to the end of treatment, but only the 1.7 million data points with a 'beam on' tag were used in the analysis. There were 21 obese patients, with BMI {>=}30 and 45 nonobese patients in the study. Results: Mean displacements were least in the left-right lateral direction (0.56 {+-} 0.24 mm) and approximately twice that magnitude in the superior-inferior and anterior-posterior directions. The net vector displacement was larger still, 1.95 {+-} 0.47 mm. Stratified by BMI cohort, the mean displacements per patient in the 3 Cartesian axes as well as the net vector for patients with BMI {>=}30 were slightly less (<0.2 mm) but not significantly different than the corresponding values for patients with lower BMIs. As a surrogate for the magnitude of oscillatory noise, the standard deviation for displacements in all measured planes showed no significant differences in the prostate positional variability between the lower and higher BMI groups. Histograms of prostate displacements showed a lower frequency of large displacements in obese patients, and there were no significant differences in short-term and long-term velocity distributions. Conclusions: After patients were positioned accurately using implanted radiofrequency transponders, the intrafractional displacements in the lateral, superior-inferior, and anterior-posterior directions as well as the net vector displacements were smaller, but not significantly so, for obese men than for those with lower BMI.

Butler, Wayne M., E-mail: wbutler@wheelinghospital.org [Schiffler Cancer Center, Wheeling Hospital, Wheeling, West Virginia (United States); Wheeling Jesuit University, Wheeling, West Virginia (United States); Morris, Mallory N. [Schiffler Cancer Center, Wheeling Hospital, Wheeling, West Virginia (United States)] [Schiffler Cancer Center, Wheeling Hospital, Wheeling, West Virginia (United States); Merrick, Gregory S. [Schiffler Cancer Center, Wheeling Hospital, Wheeling, West Virginia (United States) [Schiffler Cancer Center, Wheeling Hospital, Wheeling, West Virginia (United States); Wheeling Jesuit University, Wheeling, West Virginia (United States); Kurko, Brian S.; Murray, Brian C. [Schiffler Cancer Center, Wheeling Hospital, Wheeling, West Virginia (United States)] [Schiffler Cancer Center, Wheeling Hospital, Wheeling, West Virginia (United States)

2012-10-01T23:59:59.000Z

269

Pressure balanced drag turbine mass flow meter  

DOE Patents (OSTI)

The density of the fluid flowing through a tubular member may be measured by a device comprising a rotor assembly suspended within the tubular member, a fluid bearing medium for the rotor assembly shaft, independent fluid flow lines to each bearing chamber, and a scheme for detection of any difference between the upstream and downstream bearing fluid pressures. The rotor assembly reacts to fluid flow both by rotation and axial displacement; therefore concurrent measurements may be made of the velocity of blade rotation and also bearing pressure changes, where the pressure changes may be equated to the fluid momentum flux imparted to the rotor blades. From these parameters the flow velocity and density of the fluid may be deduced.

Dacus, Michael W. (Gilbert, AR); Cole, Jack H. (Fayetteville, AR)

1982-01-01T23:59:59.000Z

270

Pressure balanced drag turbine mass flow meter  

DOE Patents (OSTI)

The density of the fluid flowing through a tubular member may be measured by a device comprising a rotor assembly suspended within the tubular member, a fluid bearing medium for the rotor assembly shaft, independent fluid flow lines to each bearing chamber, and a scheme for detection of any difference between the upstream and downstream bearing fluid pressures. The rotor assembly reacts to fluid flow both by rotation and axial displacement; therefore concurrent measurements may be made of the velocity of blade rotation and also bearing pressure changes, where the pressure changes may be equated to the fluid momentum flux imparted to the rotor blades. From these parameters the flow velocity and density of the fluid may be deduced.

Dacus, M.W.; Cole, J.H.

1980-04-23T23:59:59.000Z

271

Acoustic analogues of black hole singularities  

SciTech Connect

We search for acoustic analogues of a spherical symmetric black hole with a pointlike source. We show that the gravitational system has a dynamical counterpart in the constrained, steady motion of a fluid with a planar source. The equations governing the dynamics of the gravitational system can be exactly mapped in those governing the motion of the fluid. The different meaning that singularities and sources have in fluid dynamics and in general relativity is also discussed. Whereas in the latter a pointlike source is always associated with a (curvature) singularity in the former the presence of sources does not necessarily imply divergences of the fields.

Cadoni, Mariano; Mignemi, Salvatore [Dipartimento di Fisica, Universita di Cagliari, and INFN, Sezione di Cagliari, Cittadella Universitaria 09042 Monserrato (Italy); Dipartimento di Matematica, Universita di Cagliari, viale Merello 92, 09123 Cagliari, Italy, and INFN, Sezione di Cagliari (Italy)

2005-10-15T23:59:59.000Z

272

Acoustic analogues of black hole singularities  

E-Print Network (OSTI)

We search for acoustic analogues of a spherical symmetric black hole with a pointlike source. We show that the gravitational system has a dynamical counterpart in the constrained, steady motion of a fluid with a planar source. The equations governing the dynamics of the gravitational system can be exactly mapped in those governing the motion of the fluid. The different meaning that singularities and sources have in fluid dynamics and in general relativity is also discussed. Whereas in the latter a pointlike source is always associated with a (curvature) singularity in the former the presence of sources does not necessarily imply divergences of the fields.

Mariano Cadoni; Salvatore Mignemi

2005-04-29T23:59:59.000Z

273

Underwater Acoustic Sensor Networks: Research Challenges  

E-Print Network (OSTI)

Underwater sensor nodes will find applications in oceanographic data collection, pollution monitoring, o#shore exploration, disaster prevention, assisted navigation and tactical surveillance applications. Moreover, unmanned or autonomous underwater vehicles (UUVs, AUVs), equipped with sensors, will enable the exploration of natural undersea resources and gathering of scientific data in collaborative monitoring missions. Underwater acoustic networking is the enabling technology for these applications. Underwater networks consist of a variable number of sensors and vehicles that are deployed to perform collaborative monitoring tasks over a given area.

Ian Akyildiz Dario; Ian F. Akyildiz; Dario Pompili; Tommaso Melodia

2005-01-01T23:59:59.000Z

274

Underwater Acoustic Sensor Networks: Research Challenges  

E-Print Network (OSTI)

Underwater sensor nodes will find applications in oceanographic data collection, pollution monitoring, o#shore exploration, disaster prevention, assisted navigation and tactical surveillance applications. Moreover, unmanned or autonomous underwater vehicles (UUVs, AUVs), equipped with sensors, will enable the exploration of natural undersea resources and gathering of scientific data in collaborative monitoring missions. Underwater acoustic networking is the enabling technology for these applications. Underwater networks consist of a variable number of sensors and vehicles that are deployed to perform collaborative monitoring tasks over a given area. In this

Ian F. Akyildiz; Dario Pompili; Tommaso Melodia

2005-01-01T23:59:59.000Z

275

Fast LMS/Newton algorithms for stereophonic acoustic echo cancelation  

Science Conference Proceedings (OSTI)

This paper presents a new class of adaptive filtering algorithms to solve the stereophonic acoustic echo cancelation (AEC) problem in teleconferencing systems. While stereophonic AEC may be seen as a simple generalization of the well-known single-channel ... Keywords: LMS/Newton, adaptive filters, lattice orthogonalization, stereo acoustic echo cancellation (AEC)

Harsha I. K. Rao; Behrouz Farhang-Boroujeny

2009-08-01T23:59:59.000Z

276

Resonant acoustic transducer system for a well drilling string  

DOE Patents (OSTI)

For use in transmitting acoustic waves propated along a well drilling string, a piezoelectric transducer is provided operating in the relatively low loss acoustic propagation range of the well drilling string. The efficiently coupled transmitting transducer incorporates a mass-spring-piezoelectric transmitter combination permitting a resonant operation in the desired low frequency range.

Nardi, Anthony P. (Burlington, MA)

1981-01-01T23:59:59.000Z

277

Resonant acoustic transducer system for a well drilling string  

DOE Patents (OSTI)

For use in transmitting acoustic waves propagated along a well drilling string, a piezoelectric transducer is provided operating in the relatively low loss acoustic propagation range of the well drilling string. The efficiently coupled transmitting transducer incorporates a mass-spring-piezoelectric transmitter combination permitting resonant operation in the desired low frequency range.

Kent, William H. (Westford, MA); Mitchell, Peter G. (Concord, MA)

1981-01-01T23:59:59.000Z

278

Tomographic Maps of the Ocean Mesoscale. Part 1: Pure Acoustics  

Science Conference Proceedings (OSTI)

A field test of ocean acoustic tomography was conducted in 1981 for a two month period in a 300 km square at 26°N, 70°W in the North Atlantic (just south of the MODE region). Nine acoustic deep-sea moorings with sea floor transponders for ...

B. Cornuelle; C. Wunsch; D. Behringer; T. Birdsall; M. Brown; R. Heinmiller; R. Knox; K. Metzger; W. Munk; J. Spiesberger; R. Spindel; D. Webb; P. Worcester

1985-02-01T23:59:59.000Z

279

Focused beam routing protocol for underwater acoustic networks  

Science Conference Proceedings (OSTI)

Multi-hop transmission is considered for large coverage areas in bandwidth-limited underwater acoustic networks. In this paper, we present a scalable routing technique based on location information, and optimized for minimum energy per bit consumption. ... Keywords: power control, routing, underwater acoustic networks

Josep Miquel Jornet; Milica Stojanovic; Michele Zorzi

2008-09-01T23:59:59.000Z

280

Acoustic detection of partial discharges in insulation oil  

Science Conference Proceedings (OSTI)

In this paper, we performed an insulation diagnosis technique for oil-immersed power transformers by an acoustic detection method. Electrode system such as needle to plane electrode was fabricated to simulate a defect of power transformers. In addition, ... Keywords: acoustic detection, frequency component, insulation diagnostic, partial discharge, positioning

Dae-Won Park; Sang-Wook Cha; Gyung-Suk Kil

2011-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "acoustics displacement flow" 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

Intelligent acoustic rotor speed estimation for an autonomous helicopter  

Science Conference Proceedings (OSTI)

Acoustic sensing to gather information about a machine can be highly beneficial, but processing the data can be difficult. In this work, a variety of methodologies have been studied to extract rotor speed information from the sound signature of an autonomous ... Keywords: Acoustic sensing, Adaptive network-based fuzzy inference system, Artificial neural network, Feature selection, Genetic algorithm, Helicopter, Rotor speeds

Benjamin N. Passow; Mario A. Gongora; Adrian A. Hopgood; Sophy Smith

2012-11-01T23:59:59.000Z

282

Acoustical Measurement of Current and Vorticity beneath Ice  

Science Conference Proceedings (OSTI)

An acoustical instrument has been developed to measure path-averaged horizontal current and vorticity in the subice boundary layer of the eastern Arctic during the spring of 1989. A triangular acoustic array of side 200 m was used to obtain ...

Dimitris Menemenlis; David M. Farmer

1992-12-01T23:59:59.000Z

283

Borehole-Wall Imaging with Acoustic and Optical Televiewers for  

Open Energy Info (EERE)

Borehole-Wall Imaging with Acoustic and Optical Televiewers for Borehole-Wall Imaging with Acoustic and Optical Televiewers for Fractured-Bedrock Aquifer Investigations Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Paper: Borehole-Wall Imaging with Acoustic and Optical Televiewers for Fractured-Bedrock Aquifer Investigations Abstract Imaging with acoustic and optical televiewers results in continuous and oriented 360 degree views of the borehole wall from which the character and orientation of lithologic and structural features can be defined for fractured-bedrock aquifer investigations. Fractures are more clearly defined under a wider range of conditions on acoustic images than on optical images including dark-colored rocks, cloudy borehole water, and coated borehole walls. However, optical images allow for the direct viewing

284

Acoustic-velocity measurements in materials using a regenerative method  

DOE Patents (OSTI)

Acoustic energy is propatated through earth material between an electro-acoustic generator and a receiver which converts the received acoustic energy into electrical signals. A closed loop is formed by a variable gain amplifier system connected between the receiver and the generator. The gain of the amplifier system is increased until sustained oscillations are produced in the closed loop. The frequency of the oscillations is measured as an indication of the acoustic propagation velocity through the earth material. The amplifier gain is measured as an indication of the acoustic attenuation through the earth materials. The method is also applicable to the non-destructive testing of structural materials, such as steel, aluminum and concrete.

Laine, E.F.

1982-09-30T23:59:59.000Z

285

Acoustic velocity measurements in materials using a regenerative method  

DOE Patents (OSTI)

Acoustic energy is propagated through earth material between an electro-acoustic generator and a receiver which converts the received acoustic energy into electrical signals. A closed loop is formed by a variable gain amplifier system connected between the receiver and the generator. The gain of the amplifier system is increased until sustained oscillations are produced in the closed loop. The frequency of the oscillations is measured as an indication of the acoustic propagation velocity through the earth material. The amplifier gain is measured as an indication of the acoustic attenuation through the earth materials. The method is also applicable to the non-destructive testing of structural materials, such as steel, aluminum and concrete.

Laine, Edwin F. (Alamo, CA)

1986-01-01T23:59:59.000Z

286

Building Energy Software Tools Directory: AcousticCalc  

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

AcousticCalc AcousticCalc Developed over the last decade, AcousticCalc helps designers predict sound levels at the room level from a distant sound source. The program uses the ASHRAE Handbook and ASHRAE's 1991 Algorithms for HVAC Acoustics handbook methods with the "Source-Path-Receiver" model. This easy-to-use Windows-based program allows a user to define and save unlimited number of sound sources, save and define unlimited number of sound "paths" (composed of long list of possible duct component types) and model the ceiling effect and three different models for room effect. AcousticCalc allows a user to import and export (share) sound sources, user-defined devices, terminal units, and duct silencers with other users. Easy-to-navigate "tree" modeling allows an unlimited number of sound

287

DOE's Office of Science Sets up Program to Aid Scientists Displaced by  

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

DOE's Office of Science Sets up Program to Aid Scientists Displaced DOE's Office of Science Sets up Program to Aid Scientists Displaced by Hurricane Katrina DOE's Office of Science Sets up Program to Aid Scientists Displaced by Hurricane Katrina September 9, 2005 - 10:08am Addthis WASHINGTON, DC -- The Department of Energy's (DOE) Office of Science has established a program to assist scientists displaced by the effects of Hurricane Katrina. "Our colleagues in science have historically been a close-knit, generous community," wrote Dr. Raymond L. Orbach, director of DOE's Office of Science, in a letter describing the program to: universities and colleges, including those in Alabama, Louisiana and Mississippi; professional scientific societies; other government science funding agencies; and DOE National Laboratories. "The Office of Science

288

Beyond a Billion: Clean Cities Coaliations Have Displaced More Than a Billion Gallons of Gasoline  

DOE Green Energy (OSTI)

In 2004, DOE's Clean Cities achieved a milestone - displacing the equivalent of more than 1 billion gallons of gasoline since 1994. This fact sheet describes how Clean Cities achieved this goal.

Not Available

2005-10-01T23:59:59.000Z

289

Improving Petroleum Displacement Potential of PHEVs Using Enhanced Charging Scenarios: Preprint  

DOE Green Energy (OSTI)

Describes NREL's R&D on the petroleum displacement potential of plug-in hybrid vehicles; vehicles charged during the day would save about 5% more fuel than those charged at night.

Markel, T.; Smith, K.; Pesaran, A. A.

2009-05-01T23:59:59.000Z

290

Opto-acoustic transducer for medical applications  

DOE Patents (OSTI)

This invention is an optically activated transducer for generating acoustic vibrations in a biological medium. The transducer is located at the end of a fiber optic which may be located within a catheter. Energy for operating the transducer is provided optically by laser light transmitted through the fiber optic to the transducer. Pulsed laser light is absorbed in the working fluid of the transducer to generate a thermal pressure and consequent adiabatic expansion of the transducer head such that it does work against the ambient medium. The transducer returns to its original state by a process of thermal cooling. The motion of the transducer within the ambient medium couples acoustic energy into the medium. By pulsing the laser at a high repetition rate (which may vary from CW to 100 kHz) an ultrasonic radiation field can be established locally in the medium. This method of producing ultrasonic vibrations can be used in vivo for the treatment of stroke-related conditions in humans, particularly for dissolving thrombus. The catheter may also incorporate anti-thrombolytic drug treatments as an adjunct therapy and it may be operated in conjunction with ultrasonic detection equipment for imaging and feedback control.

Benett, William (Livermore, CA); Celliers, Peter (Berkeley, CA); Da Silva, Luiz (Danville, CA); Glinsky, Michael (Livermore, CA); London, Richard (Orinda, CA); Maitland, Duncan (Livermore, CA); Matthews, Dennis (Moss Beach, CA); Krulevich, Peter (Pleasanton, CA); Lee, Abraham (Walnut Creek, CA)

1999-01-01T23:59:59.000Z

291

Opto-acoustic transducer for medical applications  

DOE Patents (OSTI)

This invention is an optically activated transducer for generating acoustic vibrations in a biological medium. The transducer is located at the end of a fiber optic which may be located within a catheter. Energy for operating the transducer is provided optically by laser light transmitted through the fiber optic to the transducer. Pulsed laser light is absorbed in the working fluid of the transducer to generate a thermal pressure and consequent adiabatic expansion of the transducer head such that it does work against the ambient medium. The transducer returns to its original state by a process of thermal cooling. The motion of the transducer within the ambient medium couples acoustic energy into the medium. By pulsing the laser at a high repetition rate (which may vary from CW to 100 kHz) an ultrasonic radiation field can be established locally in the medium. This method of producing ultrasonic vibrations can be used in vivo for the treatment of stroke-related conditions in humans, particularly for dissolving thrombus. The catheter may also incorporate anti-thrombolytic drug treatments as an adjunct therapy and it may be operated in conjunction with ultrasonic detection equipment for imaging and feedback control.

Benett, William (Livermore, CA); Celliers, Peter (Berkeley, CA); Da Silva, Luiz (Danville, CA); Glinsky, Michael (Livermore, CA); London, Richard (Orinda, CA); Maitland, Duncan (Livermore, CA); Matthews, Dennis (Moss Beach, CA); Krulevich, Peter (Pleasanton, CA); Lee, Abraham (Walnut Creek, CA)

2002-01-01T23:59:59.000Z

292

Opto-acoustic transducer for medical applications  

Science Conference Proceedings (OSTI)

This invention is an optically activated transducer for generating acoustic vibrations in a biological medium. The transducer is located at the end of a fiber optic which may be located within a catheter. Energy for operating the transducer is provided optically by laser light transmitted through the fiber optic to the transducer. Pulsed laser light is absorbed in the working fluid of the transducer to generate a thermal pressure and consequent adiabatic expansion of the transducer head such that it does work against the ambient medium. The transducer returns to its original state by a process of thermal cooling. The motion of the transducer within the ambient medium couples acoustic energy into the medium. By pulsing the laser at a high repetition rate (which may vary from CW to 100 kHz) an ultrasonic radiation field can be established locally in the medium. This method of producing ultrasonic vibrations can be used in vivo for the treatment of stroke-related conditions in humans, particularly for dissolving thrombus. The catheter may also incorporate anti-thrombolytic drug treatments as an adjunct therapy and it may be operated in conjunction with ultrasonic detection equipment for imaging and feedback control. 7 figs.

Benett, W.; Celliers, P.; Da Silva, L.; Glinsky, M.; London, R.; Maitland, D.; Matthews, D.; Krulevich, P.; Lee, A.

1999-08-31T23:59:59.000Z

293

Oil displacement through a porous medium with a temperature gradient  

E-Print Network (OSTI)

We investigate the effect of a temperature gradient on oil recovery in a two-dimensional pore-network model. The oil viscosity depends on temperature as, $\\mu_o=exp(B/T)$, where $B$ is a physico-chemical parameter depending on the type of oil, and $T$ is the temperature. A temperature gradient is applied across the medium in the flow direction. Initially, the porous medium is saturated with oil and, then, another fluid is injected. We have considered two cases representing different injection strategies. In the first case, the invading fluid viscosity is constant (finite viscosity ratio) while in the second one, the invading fluid is inviscid (infinite viscosity ratio). Our results show that, for the case of finite viscosity ratio, recovery increases with $\\Delta T$ independently on strength or sign of the gradient. For an infinite viscosity ratio, a positive temperature gradient is necessary to enhance recovery. Moreover, we show that, for $\\Delta T>0$, the percentage of oil recovery generally decreases (inc...

Oliveira, C L N; Herrmann, H J

2011-01-01T23:59:59.000Z

294

Droplet Combustion and Non-Reactive Shear-Coaxial Jets with Transverse Acoustic Excitation  

E-Print Network (OSTI)

Related Works in Droplet Combustion . . . . . . . .of Acoustics on Droplet Combustion . . . . . . . . . . . .Fuel Droplet Combustion . . . . . . . . . . . . . . .

Teshome, Sophonias

2012-01-01T23:59:59.000Z

295

Passive acoustic fetal heart rate monitoring with a parallel redundance approach  

Science Conference Proceedings (OSTI)

Acoustic methods for monitoring fetal heart rate are potentially advantageous over ultrasound methods

Stephen A. Zahorian; Zongyao Zhou; Charles Brewton

1995-01-01T23:59:59.000Z

296

A Numerical Study on the Enhancement of Heat Transfer by Pressure Distributions in Acoustic Fields  

Science Conference Proceedings (OSTI)

The enhancement of heat transfer in a cavity was investigated in the absence of and in the presence of acoustic streaming induced by ultrasonic waves. The present study provides the experimental and numerical results of heat transfer in the acoustic ... Keywords: Acoustic pressure, Acoustic streaming, Coupled FE-BEM, Particle imaging velocimetry (PIV), Ultrasonic wave

Y. K. Oh; H. D. Yang

2005-01-01T23:59:59.000Z

297

Origin, distribution, and movement of brine in the Permian Basin (U. S. A. ). A model for displacement of connate brine  

SciTech Connect

Na-Cl, halite Ca-Cl, and gypsum Ca-Cl brines with salinities from 45 to >300 g/L are identified and mapped in four hydrostratigraphic units in the Permian Basin area beneath western Texas and Oklahoma and eastern New Mexico, providing spatial and lithologic constraints on the interpretation of the origin and movement of brine. Na-Cl brine is derived from meteoric water as young as 5-10 Ma that dissolved anhydrite and halite, whereas Ca-Cl brine is interpreted to be ancient, modified-connate Permian brine that now is mixing with, and being displaced by, the Na-Cl brine. Displacement fronts appear as broad mixing zones with no significant salinity gradients. Evolution of Ca-Cl brine composition from ideal evaporated sea water is attributed to dolomitization and syndepositional recycling of halite and bittern salts by intermittent influx of fresh water and sea water. Halite Ca-Cl brine in the evaporite section in the northern part of the basin differs from gypsum Ca-Cl brine in the south-central part in salinity and Na/Cl ratio and reflects segregation between halite- and gypsum-precipitating lagoons during the Permian. Ca-Cl brine moved downward through the evaporite section into the underlying Lower Permian and Pennsylvanian marine section that is now the deep-basin brine aquifer, mixing there with pre-existing sea water. Buoyancy-driven convection of brine dominated local flow for most of basin history, with regional advection governed by topographically related forces dominant only for the past 5 to 10 Ma. 71 refs., 11 figs.

Bein, A.; Dutton, A.R. (Univ. of Texas, Austin (United States))

1993-06-01T23:59:59.000Z

298

Smolt Responses to Hydrodynamic Conditions in Forebay Flow Nets of Surface Flow Outlets, 2007  

DOE Green Energy (OSTI)

This study provides information on juvenile salmonid behaviors at McNary and The Dalles dams that can be used by the USACE, fisheries resource managers, and others to support decisions on long-term measures to enhance fish passage. We researched smolt movements and ambient hydrodynamic conditions using a new approach combining simultaneous acoustic Doppler current profiler (ADCP) and acoustic imaging device (AID) measurements at surface flow outlets (SFO) at McNary and The Dalles dams on the Columbia River during spring and summer 2007. Because swimming effort vectors could be computed from the simultaneous fish and flow data, fish behavior could be categorized as passive, swimming against the flow (positively rheotactic), and swimming with the flow (negatively rheotactic). We present bivariate relationships to provide insight into fish responses to particular hydraulic variables that engineers might consider during SFO design. The data indicate potential for this empirical approach of simultaneous water/fish measurements to lead to SFO design guidelines in the future.

Johnson, Gary E.; Richmond, Marshall C.; Hedgepeth, J. B.; Ploskey, Gene R.; Anderson, Michael G.; Deng, Zhiqun; Khan, Fenton; Mueller, Robert P.; Rakowski, Cynthia L.; Sather, Nichole K.; Serkowski, John A.; Steinbeck, John R.

2009-04-01T23:59:59.000Z

299

Raising Photoemission Efficiency with Surface Acoustic Waves  

Science Conference Proceedings (OSTI)

We are developing a novel technique that may help increase the efficiency and reduce costs of photoelectron sources used at electron accelerators. The technique is based on the use of Surface Acoustic Waves (SAW) in piezoelectric materials, such as GaAs, that are commonly used as photocathodes. Piezoelectric fields produced by the traveling SAW spatially separate electrons and holes, reducing their probability of recombination, thereby enhancing the photoemission quantum efficiency of the photocathode. Additional advantages could be increased polarization provided by the enhanced mobility of charge carriers that can be controlled by the SAW and the ionization of optically-generated excitons resulting in the creation of additional electron-hole pairs. It is expected that these novel features will reduce the cost of accelerator operation. A theoretical model for photoemission in the presence of SAW has been developed, and experimental tests of the technique are underway.

A. Afanasev, F. Hassani, C.E. Korman, V.G. Dudnikov, R.P. Johnson, M. Poelker, K.E.L. Surles-Law

2012-07-01T23:59:59.000Z

300

Acoustic Timing Simulation of Active Beacons for  

E-Print Network (OSTI)

A simulation of freely-deployed active underwater beacons to estimate the tow path of a Synthetic Aperture Sonar (SAS) towfish is presented. Knowledge of the tow path allows the removal of motion induced blurring in the SAS images. The beacons sit on the seabed listening for acoustic chirps from the sonar and retransmit back in a different frequency band after a fixed time delay. After reconstruction the beacons appear in the SAS image as point-source targets, blurred by towfish motion, from which the tow-path can be determined by triangulation. The effect of reconstructing the continuous towfish motion as discrete along-track `hops' is also investigated. Simulations of a towfish path with 20 cm sway amplitude and typical measurement timing errors show a significant improvement in image quality using two active beacons.

Measuring The Tow-Path; Edward N. Pilbrow; Michael P. Hayes

2003-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "acoustics displacement flow" 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

Online Image-based Monitoring of Soft-tissue Displacements for Radiation Therapy of the Prostate  

Science Conference Proceedings (OSTI)

Purpose: Emerging prolonged, hypofractionated radiotherapy regimens rely on high-dose conformality to minimize toxicity and thus can benefit from image guidance systems that continuously monitor target position during beam delivery. To address this need we previously developed, as a potential add-on device for existing linear accelerators, a novel telerobotic ultrasound system capable of real-time, soft-tissue imaging. Expanding on this capability, the aim of this work was to develop and characterize an image-based technique for real-time detection of prostate displacements. Methods and Materials: Image processing techniques were implemented on spatially localized ultrasound images to generate two parameters representing prostate displacements in real time. In a phantom and five volunteers, soft-tissue targets were continuously imaged with a customized robotic manipulator while recording the two tissue displacement parameters (TDPs). Variations of the TDPs in the absence of tissue displacements were evaluated, as was the sensitivity of the TDPs to prostate translations and rotations. Robustness of the approach to probe force was also investigated. Results: With 95% confidence, the proposed method detected in vivo prostate displacements before they exceeded 2.3, 2.5, and 2.8 mm in anteroposterior, superoinferior, and mediolateral directions. Prostate pitch was detected before exceeding 4.7 Degree-Sign at 95% confidence. Total system time lag averaged 173 ms, mostly limited by ultrasound acquisition rate. False positives (FPs) (FP) in the absence of displacements did not exceed 1.5 FP events per 10 min of continuous in vivo imaging time. Conclusions: The feasibility of using telerobotic ultrasound for real-time, soft-tissue-based monitoring of target displacements was confirmed in vivo. Such monitoring has the potential to detect small clinically relevant intrafractional variations of the prostate position during beam delivery.

Schlosser, Jeffrey [Department of Mechanical Engineering, Stanford University, Stanford, CA (United States) [Department of Mechanical Engineering, Stanford University, Stanford, CA (United States); Department of Bioengineering, Stanford University, Stanford, CA (United States); Salisbury, Kenneth [Department of Computer Science, Stanford University, Stanford, CA (United States) [Department of Computer Science, Stanford University, Stanford, CA (United States); Department of Surgery, Stanford University, Stanford, CA (United States); Hristov, Dimitre, E-mail: dhristov@stanford.edu [Department of Radiation Oncology, Stanford University, Stanford, CA (United States)] [Department of Radiation Oncology, Stanford University, Stanford, CA (United States)

2012-08-01T23:59:59.000Z

302

FLOW GATING  

DOE Patents (OSTI)

BS>This invention is a fast gating system for eiectronic flipflop circuits. Diodes connect the output of one circuit to the input of another, and the voltage supply for the receiving flip-flop has two alternate levels. When the supply is at its upper level, no current can flow through the diodes, but when the supply is at its lower level, current can flow to set the receiving flip- flop to the same state as that of the circuit to which it is connected. (AEC)

Poppelbaum, W.J.

1962-12-01T23:59:59.000Z

303

Flow cytometer  

DOE Patents (OSTI)

A Faraday cage enclosing the flow chamber of a cytometer and ground planes associated with each field deflection plate in concert therewith inhibit electric fields from varying the charge on designated events/droplets and further concentrates and increases forces applied to a charged event passing therethrough for accurate focus thereof while concomitantly inhibiting a potential shock hazard.

van den Engh, Ger (Seattle, WA)

1995-01-01T23:59:59.000Z

304

Flow cytometer  

DOE Patents (OSTI)

A Faraday cage is described which encloses the flow chamber of a cytometer. Ground planes associated with each field deflection plate inhibit electric fields from varying the charge on designated events/droplets and further concentrates. They also increase forces applied to a passing charged event for accurate focus while concomitantly inhibiting a potential shock hazard. 4 figs.

Van den Engh, G.

1995-11-07T23:59:59.000Z

305

An Intercomparison of Current Measurements Using a Vector Measuring Current Meter, an Acoustic Doppler Current Profiler, and a Recently Developed Acoustic Current Meter  

Science Conference Proceedings (OSTI)

Horizontal current measurements were obtained simultaneously with a vector measuring current meter (VMCM), an acoustic Doppler current profiler (ADCP), and the recently developed Falmouth Scientific, Inc., acoustic current meter (ACM) during a ...

T. P. Gilboy; T. D. Dickey; D. E. Sigurdson; X. Yu; D. Manov

2000-04-01T23:59:59.000Z

306

Speech coding, reconstruction and recognition using acoustics and electromagnetic waves  

DOE Patents (OSTI)

The use of EM radiation in conjunction with simultaneously recorded acoustic speech information enables a complete mathematical coding of acoustic speech. The methods include the forming of a feature vector for each pitch period of voiced speech and the forming of feature vectors for each time frame of unvoiced, as well as for combined voiced and unvoiced speech. The methods include how to deconvolve the speech excitation function from the acoustic speech output to describe the transfer function each time frame. The formation of feature vectors defining all acoustic speech units over well defined time frames can be used for purposes of speech coding, speech compression, speaker identification, language-of-speech identification, speech recognition, speech synthesis, speech translation, speech telephony, and speech teaching.

Holzrichter, John F. (Berkeley, CA); Ng, Lawrence C. (Danville, CA)

1998-01-01T23:59:59.000Z

307

Acoustic Logs At Coso Geothermal Area (1977) | Open Energy Information  

Open Energy Info (EERE)

Coso Geothermal Area (1977) Coso Geothermal Area (1977) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Acoustic Logs At Coso Geothermal Area (1977) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Acoustic Logs Activity Date 1977 Usefulness not indicated DOE-funding Unknown Notes Acoustic logs indicate fractured rock and potentially permeable zones. References Galbraith, R. M. (1 May 1978) Geological and geophysical analysis of Coso Geothermal Exploration Hole No. 1 (CGEH-1), Coso Hot Springs KGRA, California Goranson, C.; Schroeder, R. (1 June 1978) Static downhole characteristics of well CGEH-1 at Coso Hot Springs, China Lake, California Retrieved from "http://en.openei.org/w/index.php?title=Acoustic_Logs_At_Coso_Geothermal_Area_(1977)&oldid=510216"

308

Dual output acoustic wave sensor for molecular identification  

DOE Patents (OSTI)

The invention comprises a method for the identification and quantification of sorbed chemical species onto a coating of a device capable of generating and receiving an acoustic wave, by measuring the changes in the velocity of the acoustic wave resulting from the sorption of the chemical species into the coating as the wave travels through the coating and by measuring the changes in the attenuation of an acoustic wave resulting from the sorption of the chemical species into the coating as the wave travels through the coating. The inventive method further correlates the magnitudes of the changes of velocity with respect to changes of the attenuation of the acoustic wave to identify the sorbed chemical species. The absolute magnitudes of the velocity changes or the absolute magnitude of the attenuation changes are used to determine the concentration of the identified chemical species.

Frye, G.C.; Martin, S.J.

1990-10-03T23:59:59.000Z

309

Acoustic Method for Fish Counting and Fish Sizing in Tanks  

E-Print Network (OSTI)

A-123: 3.01.2004–2.28.2005 Acoustic Method for Fish Countingand Fish Sizing in Tanks W.A. Kuperman and Philippe Rouxlower the costs of raising fish to marketable size. Water,

Kuperman, William A.; Roux, Philippe

2004-01-01T23:59:59.000Z

310

AMOC: Acoustic monitoring of the ocean climate of the Arctic  

Science Conference Proceedings (OSTI)

The overall objective of AMOC is to develop and design an acoustic system for long?term monitoring of the ocean temperature and ice thickness in the Arctic Ocean including the Fram Strait

Ola M. Johannessen; AMOC Group

1999-01-01T23:59:59.000Z

311

Direct-form adaptive equalization for underwater acoustic communication  

E-Print Network (OSTI)

Adaptive equalization is an important aspect of communication systems in various environments. It is particularly important in underwater acoustic communication systems, as the channel has a long delay spread and is subject ...

Yellepeddi, Atulya

2012-01-01T23:59:59.000Z

312

The Measurement of Bubble-Size Distributions by Acoustical Backscatter  

Science Conference Proceedings (OSTI)

A multifrequency acoustical-backscatter technique is described for determining the size distribution of bubbles with radii between 8 and 130 µm. 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

313

Acoustic Waveform Logging - Advances In Theory And Application  

E-Print Network (OSTI)

Full-waveform acoustic logging has made significant advances in both theory and application in recent years, and these advances have greatly increased the capability of log analysts to measure the physical properties of ...

Cheng, C. H.

314

Speech coding, reconstruction and recognition using acoustics and electromagnetic waves  

DOE Patents (OSTI)

The use of EM radiation in conjunction with simultaneously recorded acoustic speech information enables a complete mathematical coding of acoustic speech. The methods include the forming of a feature vector for each pitch period of voiced speech and the forming of feature vectors for each time frame of unvoiced, as well as for combined voiced and unvoiced speech. The methods include how to deconvolve the speech excitation function from the acoustic speech output to describe the transfer function each time frame. The formation of feature vectors defining all acoustic speech units over well defined time frames can be used for purposes of speech coding, speech compression, speaker identification, language-of-speech identification, speech recognition, speech synthesis, speech translation, speech telephony, and speech teaching. 35 figs.

Holzrichter, J.F.; Ng, L.C.

1998-03-17T23:59:59.000Z

315

Acoustic Tomographic Monitoring of the Atmospheric Surface Layer  

Science Conference Proceedings (OSTI)

Acoustic tomography is proposed as a method for monitoring near-surface atmospheric temperature and wind velocity fields. Basic issues relating to the feasibility and implementation of atmospheric tomography are discussed. Among these issues are ...

D. Keith Wilson; Dennis W. Thomson

1994-06-01T23:59:59.000Z

316

Laser-Acoustic Hygrometer: Procedure and Results of Field Measurements  

Science Conference Proceedings (OSTI)

Trial field measurements of humidity fluctuations are taken by a laser-acoustic hygrometer consisting of a CO laser, a mechanical modulator, a detector, an audio-frequency amplifier, and a device for processing signals. The proposed method is ...

Boris S. Agrovskii; Alexandre S. Gurvich; Vitaly P. Kukharets; Valery V. Vorob’ev

1998-02-01T23:59:59.000Z

317

Acoustic classification of buried objects with mobile sonar platforms  

E-Print Network (OSTI)

In this thesis, the use of highly mobile sonar platforms is investigated for the purpose of acoustically classifying compact objects on or below the seabed. The extension of existing strategies, including synthetic aperture ...

Edwards, Joseph Richard, 1971-

2006-01-01T23:59:59.000Z

318

Acoustic Waves in the Turbulent Atmosphere: A Review  

Science Conference Proceedings (OSTI)

The subject of atmospheric acoustics and its role in atmospheric research and in development of modern methods of ground-based remote sensing of the atmosphere are outlined. A historical overview of investigations of the effect of atmospheric ...

M. A. Kallistratova

2002-08-01T23:59:59.000Z

319

Using Acoustic Emission in Fatigue and Fracture Materials Research  

Science Conference Proceedings (OSTI)

J.E. Coulter et al., "Acoustic Emission Monitoring of Fossil-Fuel Power Plants," Mat. Eval., 46 (2) (1988), pp. 230–237. 13. P.J. de Groot, P.M. Wijnen, and R.B.F.

320

Laboratory Comparisons of Acoustic and Optical Sensors for Microbubble Measurement  

Science Conference Proceedings (OSTI)

This paper presents the results of a recent comparison between three microbubble size spectrum measurement systems. These systems are the light-wattering bubble counter, the photographic bubble-imaging system, and the acoustic resonator array. ...

Ming Vang Su; Douglas Todoroff; John Cartmill

1994-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "acoustics displacement flow" 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

Operating an Acoustic Doppler Current Profiler aboard a Container Vessel  

Science Conference Proceedings (OSTI)

Since October 1992 an acoustic Doppler current profiler (ADCP) has been in near-continuous operation on board a 118-m-long container vessel, the container motor vessel Oleander, which operates on a weekly schedule between Port Elizabeth, New ...

C. N. Flagg; G. Schwartze; E. Gottlieb; T. Rossby

1998-02-01T23:59:59.000Z

322

Reduced bandwidth frequency domain equalization for underwater acoustic communications  

E-Print Network (OSTI)

Two challenges facing adaptive decision feedback equalizers (DFEs) in the underwater acoustic channel are those of the channel changing too rapidly to allow for the stable adaptation of the number of coefficients required ...

Wornell, Gregory W.

323

Listening to Raindrops from Underwater: An Acoustic Disdrometer  

Science Conference Proceedings (OSTI)

Different sized raindrops splashing on a water surface produce sound underwater that is distinctive and can be used to measure the drop size distribution in the rain. Five acoustically significant raindrop sizes are described. An inversion of the ...

Jeffrey A. Nystuen

2001-10-01T23:59:59.000Z

324

MAC and Routing Protocols for Mobile Underwater Acoustic Sensor Swarms.  

E-Print Network (OSTI)

??Underwater Acoustic Sensor Networks (UW-ASNs) have recently been proposed as a way to explore and observe the ocean, which covers two-thirds of the Earth's surface.… (more)

Noh, Young Tae

2012-01-01T23:59:59.000Z

325

Modeling the Performance of an Acoustic Doppler Current Profiler  

Science Conference Proceedings (OSTI)

A systematic examination of measurement error in acoustic Doppler current profiler (ADCP) velocity estimates, in the limit of large signal-to-noise ratio, is made using a system model and sonar signal simulations coupled into an ADCP. The model ...

T. K. Chereskin; A. J. Harding

1993-02-01T23:59:59.000Z

326

Mapping acoustic emissions from hydraulic fracture treatments using coherent array processing: Concept  

DOE Green Energy (OSTI)

Hydraulic fracturing is a widely-used well completion technique for enhancing the recovery of gas and oil in low-permeability formations. Hydraulic fracturing consists of pumping fluids into a well under high pressure (1000--5000 psi) to wedge-open and extend a fracture into the producing formation. The fracture acts as a conduit for gas and oil to flow back to the well, significantly increasing communication with larger volumes of the producing formation. A considerable amount of research has been conducted on the use of acoustic (microseismic) emission to delineate fracture growth. The use of transient signals to map the location of discrete sites of emission along fractures has been the focus of most research on methods for delineating fractures. These methods depend upon timing the arrival of compressional (P) or shear (S) waves from discrete fracturing events at one or more clamped geophones in the treatment well or in adjacent monitoring wells. Using a propagation model, the arrival times are used to estimate the distance from each sensor to the fracturing event. Coherent processing methods appear to have sufficient resolution in the 75 to 200 Hz band to delineate the extent of fractures induced by hydraulic fracturing. The medium velocity structure must be known with a 10% accuracy or better and no major discontinuities should be undetected. For best results, the receiving array must be positioned directly opposite the perforations (same depths) at a horizontal range of 200 to 400 feet from the region to be imaged. Sources of acoustic emission may be detectable down to a single-sensor SNR of 0.25 or somewhat less. These conclusions are limited by the assumptions of this study: good coupling to the formation, acoustic propagation, and accurate knowledge of the velocity structure.

Harris, D.B.; Sherwood, R.J.; Jarpe, S.P.; Harben, P.E.

1991-09-01T23:59:59.000Z

327

Strongly driven ion acoustic waves in laser produced plasmas  

Science Conference Proceedings (OSTI)

This paper present an experimental study of ion acoustic waves with wavenumbers corresponding to stimulated Brillouin scattering. Time resolved Thomson scattering in frequency and wavenumber space, has permitted to observe the dispersion relation of the waves as a function of the laser intensity. Apart from observing ion acoustic waves associated with a strong second component is observed at laser intensities above 10{sup 13}Wcm{sup {minus}2}.

Baldis, H.A.; Labaune, C.; Renard, N. [Ecole Polytechnique, 91 - Palaiseau (France)] [and others

1994-09-20T23:59:59.000Z

328

Coupling light into graphene plasmons through surface acoustic waves  

E-Print Network (OSTI)

We propose a scheme for coupling laser light into graphene plasmons with the help of electrically generated surface acoustic waves. The surface acoustic wave forms a diffraction grating which allows to excite the long lived phonon-like branch of the hybridized graphene plasmon-phonon dispersion with infrared laser light. Our approach avoids patterning the graphene sheet, does not rely on complicated optical near-field techniques, and allows to electrically switch the coupling between far field radiation and propagating graphene plasmons.

Schiefele, Jürgen; Sols, Fernando; Calle, Fernando; Guinea, Francisco

2013-01-01T23:59:59.000Z

329

Acoustic Energy: An Innovative Technology for Stimulating Oil Wells  

Science Conference Proceedings (OSTI)

The objective of this investigation was to demonstrate the effectiveness of sonication in reducing the viscosity of heavy crude oils. Sonication is the use of acoustic or sound energy to produce physical and/or chemical changes in materials, usually fluids. The goal of the first project phase was to demonstrate a proof of concept for the project objective. Batch tests of three commercially available, single-weight oils (30-, 90-, and 120-wt) were performed in the laboratory. Several observations and conclusions were made from this series of experiments. These include the following: (1) In general, the lower the acoustic frequency, the greater the efficiency in reducing the viscosity of the oils; (2) Sonication treatment of the three oils resulted in reductions in viscosity that ranged from a low of 31% to a high of 75%; and (3) The results of the first phase of the project successfully demonstrated that sonication could reduce the viscosity of oils of differing viscosity. The goal of the second project phase was to demonstrate the ability of sonication to reduce the viscosity of three crude oils ranging from a light crude to a heavy crude. The experiments also were designed to examine the benefits of two proprietary chemical additives used in conjunction with sonication. Acoustic frequencies ranging from 800 Hz to 1.6 kHz were used in these tests, and a reactor chamber was designed for flow-through operation with a capacity of one gallon (3.8 liters). The three crude oils selected for use in the testing program were: (1) a heavy crude from California with a viscosity of approximately 65,000 cP (API gravity about 12{sup o}), (2) a crude from Alabama with a significant water content and a viscosity of approximately 6,000 cP (API gravity about 22 {sup o}), and (3) a light crude from the Middle East with a viscosity of approximately 700 cP (API gravity about 32{sup o}). The principal conclusions derived from the second project phase include the following: (1) The application of acoustic energy (sonication) significantly reduced the viscosity of crude oils, and the amount of viscosity reduction resulting is greater for more viscous, heavy crude oils than it is for less viscous, light crude oils. (2) Test results showed that after being heated, resulting viscosity reductions were not sustained following treatment to the extent that post-sonication reductions were sustained. (3) The maximum viscosity reductions in Oils 1, 2, and 3 due to sonication were 43%, 76%, and 6%, respectively. Samples of Oil 2 associated with larger viscosity reductions often exhibited a definite water separation layer follow the tests, whereas reductions of approximately 23% were measured when this separation was not observed. (4) It was observed that neither horn design nor the reduction of input power by 25% had very little effect on the ability of sonication to alter crude oil viscosity. (5) The chemical additives produced a range of viscosity reduction from 37% to a maximum of 94% with the largest reductions being facilitated by the abundant water present Oil 2. If the Oil 2 results are not considered, the maximum reduction was 73%. The effects of the additives and sonication are enhanced by each other. (6) In only one test did the viscosity return to as much as 50% of the pre-treatment value during a period of 30 days following treatment; recovery was much less in all other cases. Therefore, more than half of the viscosity reduction was maintained for a month without additional treatment. (7) Possible applications, market potential, and economic value of the implementation of a mature sonication technology within the petroleum industry were identified, and it was estimated that the potential exists that more than a billion barrels of oil could be upgraded or produced annually as a result. The project results successfully demonstrated that sonication alone and in combination with chemical additives can effectively reduce the viscosity of crude oils having a broad range of viscosity/API gravity values. Several recommendations are made for follow-on

Edgar, Dorland E.; Peters, Robert W.; Johnson, Donald O.; Paulsen, P. David; Roberts, Wayne

2006-04-30T23:59:59.000Z

330

Acoustic Energy: An Innovative Technology for Stimulating Oil Wells  

SciTech Connect

The objective of this investigation was to demonstrate the effectiveness of sonication in reducing the viscosity of heavy crude oils. Sonication is the use of acoustic or sound energy to produce physical and/or chemical changes in materials, usually fluids. The goal of the first project phase was to demonstrate a proof of concept for the project objective. Batch tests of three commercially available, single-weight oils (30-, 90-, and 120-wt) were performed in the laboratory. Several observations and conclusions were made from this series of experiments. These include the following: (1) In general, the lower the acoustic frequency, the greater the efficiency in reducing the viscosity of the oils; (2) Sonication treatment of the three oils resulted in reductions in viscosity that ranged from a low of 31% to a high of 75%; and (3) The results of the first phase of the project successfully demonstrated that sonication could reduce the viscosity of oils of differing viscosity. The goal of the second project phase was to demonstrate the ability of sonication to reduce the viscosity of three crude oils ranging from a light crude to a heavy crude. The experiments also were designed to examine the benefits of two proprietary chemical additives used in conjunction with sonication. Acoustic frequencies ranging from 800 Hz to 1.6 kHz were used in these tests, and a reactor chamber was designed for flow-through operation with a capacity of one gallon (3.8 liters). The three crude oils selected for use in the testing program were: (1) a heavy crude from California with a viscosity of approximately 65,000 cP (API gravity about 12{sup o}), (2) a crude from Alabama with a significant water content and a viscosity of approximately 6,000 cP (API gravity about 22 {sup o}), and (3) a light crude from the Middle East with a viscosity of approximately 700 cP (API gravity about 32{sup o}). The principal conclusions derived from the second project phase include the following: (1) The application of acoustic energy (sonication) significantly reduced the viscosity of crude oils, and the amount of viscosity reduction resulting is greater for more viscous, heavy crude oils than it is for less viscous, light crude oils. (2) Test results showed that after being heated, resulting viscosity reductions were not sustained following treatment to the extent that post-sonication reductions were sustained. (3) The maximum viscosity reductions in Oils 1, 2, and 3 due to sonication were 43%, 76%, and 6%, respectively. Samples of Oil 2 associated with larger viscosity reductions often exhibited a definite water separation layer follow the tests, whereas reductions of approximately 23% were measured when this separation was not observed. (4) It was observed that neither horn design nor the reduction of input power by 25% had very little effect on the ability of sonication to alter crude oil viscosity. (5) The chemical additives produced a range of viscosity reduction from 37% to a maximum of 94% with the largest reductions being facilitated by the abundant water present Oil 2. If the Oil 2 results are not considered, the maximum reduction was 73%. The effects of the additives and sonication are enhanced by each other. (6) In only one test did the viscosity return to as much as 50% of the pre-treatment value during a period of 30 days following treatment; recovery was much less in all other cases. Therefore, more than half of the viscosity reduction was maintained for a month without additional treatment. (7) Possible applications, market potential, and economic value of the implementation of a mature sonication technology within the petroleum industry were identified, and it was estimated that the potential exists that more than a billion barrels of oil could be upgraded or produced annually as a result. The project results successfully demonstrated that sonication alone and in combination with chemical additives can effectively reduce the viscosity of crude oils having a broad range of viscosity/API gravity values. Several recommendations are made for follow-on

Edgar, Dorland E.; Peters, Robert W.; Johnson, Donald O.; Paulsen, P. David; Roberts, Wayne

2006-04-30T23:59:59.000Z

331

DOE's Office of Science Sets Up Program to Aid Scientists Displaced by  

Office of Science (SC) Website

DOE's DOE's Office of Science Sets Up Program to Aid Scientists Displaced by Hurricane Katrina News Featured Articles Science Headlines 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 Presentations & Testimony News Archives Contact Information Office of Science U.S. Department of Energy 1000 Independence Ave., SW Washington, DC 20585 P: (202) 586-5430 09.09.05 DOE's Office of Science Sets Up Program to Aid Scientists Displaced by Hurricane Katrina Print Text Size: A A A Subscribe FeedbackShare Page WASHINGTON, DC - The Department of Energy's (DOE) Office of Science has established a program to assist scientists displaced by the effects of Hurricane Katrina. "Our colleagues in science have historically been a close-knit, generous community," wrote Dr. Raymond L. Orbach, director of DOE's Office of

332

OPERATING PROCEDURE FOR THE PORTABLE ACOUSTIC MONITORING PACKAGE (PAMP)  

Science Conference Proceedings (OSTI)

The Portable Acoustic Monitoring Package (PAMP) has been designed to record and monitor acoustic signals in high-pressure natural gas (NG) transmission lines. Of particular interest are the three acoustic signals associated with a pipeline fracture. The system is portable (less than 30 lbm) and can be used at all line pressures up to 1000 psig. The PAMP requires a shut-off valve equipped 1/2 inch NPT access port in the pipeline. It is fully functional over the typical pressure range found in the natural gas transmission pipelines in the West Virginia, Virginia, Pennsylvania, and Ohio areas. With the use of the PAMP, a full spectrum of acoustic signals can be recorded and defined in terms of acoustic energy in decibels. To detect natural gas pipeline infringements and leaks, the acoustic energy generated inside the line is monitored with a sensitive pressure-equalized microphone and a step function type {Delta}p transducer. The assembly is mounted on a 1000 psig pipe fitting-tree called the PAMP. The electronics required to record, store and analyze the data are described within this report in the format of an operating manual.

John L. Loth; Gary J. Morris; George M. Palmer; Richard Guiler; Patrick Browning

2004-08-29T23:59:59.000Z

333

Quantifying the Interfractional Displacement of the Gastroesophageal Junction During Radiation Therapy for Esophageal Cancer  

Science Conference Proceedings (OSTI)

Purpose: Accounting for interfractional changes in tumor location improves the accuracy of radiation treatment delivery. The purpose of this study was to quantify the interfractional displacement of the gastroesophageal junction (GEJ) based on standard treatment setup in patients with esophageal cancer undergoing radiation therapy. Methods and Materials: Free-breathing four-dimensional computed tomography (4D-CT) datasets were acquired weekly from 22 patients during treatment for esophageal adenocarcinoma. Scans were registered to baseline (simulation) 4D-CT scans by using bony landmarks. The distance between the center of the GEJ contour on the simulation scan and the mean location of GEJ centers on subsequent scans was used to assess changes in GEJ location between fractions; displacement was also correlated with clinical and respiratory variables. Results: The mean absolute random error was 1.69 mm (range, 0.11-4.11 mm) in the lateral direction, 1.87 mm (range, 0.51-4.09 mm) in the anterior-posterior (AP) direction, and 3.09 mm (range, 0.99-6.16 mm) in the superior-inferior (SI) direction. The mean absolute systemic GEJ displacement between fractions was 2.88 mm lateral ({>=}5 mm in 14%), mostly leftward; 2.90 mm ({>=}5 mm in 14%) AP, mostly anterior; and 6.77 mm ({>=}1 cm in 18%) SI, mostly inferior. Variations in tidal volume and diaphragmatic excursion during treatment correlated strongly with systematic SI GEJ displacement (r = 0.964, p =}60 Gy) to the GEJ, with increased hot-spot to the adjacent stomach and lung base. Conclusion: We found large (>1-cm) interfractional displacements in the GEJ in the SI (especially inferior) direction that was not accounted for when skeletal alignment alone was used for patient positioning. Because systematic displacement in the SI direction had dosimetric impact and correlated with tidal volume, better accounting for depth of breathing is needed to reduce interfractional variability.

Wang Jingya [Department of Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas (United States); Lin, Steven H., E-mail: shlin@mdanderson.org [Department of Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas (United States); Dong Lei; Balter, Peter; Mohan, Radhe [Department of Radiation Physics, University of Texas MD Anderson Cancer Center, Houston, Texas (United States); Komaki, Ritsuko; Cox, James D. [Department of Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas (United States); Starkschall, George [Department of Radiation Physics, University of Texas MD Anderson Cancer Center, Houston, Texas (United States)

2012-06-01T23:59:59.000Z

334

Performance characterization of an internsity-modulated fiber optic displacement sensor  

SciTech Connect

A testbed simulating an intensity-modulated fiber optic displacement sensor is experimentally characterized, and the implications regarding sensor design are discussed. Of interest are the intensity distribution of the transmitted optical signal and the relationships between sensor architecture and performance. Particularly, an intensity-modulated sensor's sensitivity, linearity, displacement range, and resolution are functions of the relative positioning of its transmitting and receiving fibers. In this paper, sensor architectures with various combinations of these performance metrics are discussed. A sensor capable of micrometer resolution is reported, and it is concluded that this work could lead to an improved methodology for sensor design.

Moro, Erik Allan [Los Alamos National Laboratory; Todd, Michael D [Los Alamos National Laboratory; Puckett, Santhony D [Los Alamos National Laboratory

2010-09-30T23:59:59.000Z

335

Performance characterization of an internsity-modulated fiber optic displacement sensor  

SciTech Connect

A testbed simulating an intensity-modulated fiber optic displacement sensor is experimentally characterized, and the implications regarding sensor design are discussed. Of interest are the intensity distribution of the transmitted optical signal and the relationships between sensor architecture and performance. Particularly, an intensity-modulated sensor's sensitivity, linearity, displacement range, and resolution are functions of the relative positioning of its transmitting and receiving fibers. In this paper, sensor architectures with various combinations of these performance metrics are discussed. A sensor capable of micrometer resolution is reported, and it is concluded that this work could lead to an improved methodology for sensor design.

Moro, Erik Allan [Los Alamos National Laboratory; Todd, Michael D [Los Alamos National Laboratory; Puckett, Santhony D [Los Alamos National Laboratory

2010-09-30T23:59:59.000Z

336

Very compact, high-stability electrostatic actuator featuring contact-free self-limiting displacement  

DOE Patents (OSTI)

A compact electrostatic actuator is disclosed for microelectromechanical (MEM) applications. The actuator utilizes stationary and moveable electrodes, with the stationary electrodes being formed on a substrate and the moveable electrodes being supported above the substrate on a frame. The frame provides a rigid structure which allows the electrostatic actuator to be operated at high voltages (up to 190 Volts) to provide a relatively large actuation force compared to conventional electrostatic comb actuators which are much larger in size. For operation at its maximum displacement, the electrostatic actuator is relatively insensitive to the exact value of the applied voltage and provides a self-limiting displacement.

Rodgers, M. Steven (Albuquerque, NM); Miller, Samuel L. (Albuquerque, NM)

2003-01-01T23:59:59.000Z

337

Ultrasonic fluid flow measurement method and apparatus  

DOE Patents (OSTI)

This invention is comprised of an apparatus for measuring the flow of a fluid in a pipe using ultrasonic waves. The apparatus comprises an ultrasonic generator, a lens for focusing the sound energy produced by the generator, and means for directing the focused energy into the side of the pipe through an opening and in a direction close to parallel to the long axis of the pipe. A cone carries the sound energy to the lens from the generator. Depending on the choice of materials, there may be a quarter-wave, acoustic impedance matching section between the generator and the cone to reduce the reflections of energy at the cone boundary. The lens material has an acoustic impedance similar to that of the cone material but a different sonic velocity so that the lens can converge the sound waves in the fluid. A transition section between the lens and the fluid helps to couple the energy to the fluid and assures it is directed as close to parallel to the fluid flow direction as possible.

Kronberg, J.W.

1992-12-31T23:59:59.000Z

338

Impact of wettability correlations on multiphase flow through porous media  

E-Print Network (OSTI)

In the last decades, significant progress has been made in understanding the multiphase displacement through porous media with homogeneous wettability and its relation to the pore geometry. However, the role of wettability at the scale of the pore remains still little understood. In the present study the displacement of immiscible fluids through a two-dimensional porous medium is simulated by means of a mesoscopic particle approach. The substrate is described as an assembly of non-overlapping circular disks whose preferential wettability is distributed according to prescribed spatial correlations, from pore scale up to domains at system size. We analyze how this well-defined heterogeneous wettability affects the flow and try to establish a relationship among wettability-correlations and large-scale properties of the multiphase flow.

Marta S. de La Lama; Martin Brinkmann

2012-05-31T23:59:59.000Z

339

Three-dimensional midpoint displacement algorithm for the generation of fractal porous media  

Science Conference Proceedings (OSTI)

We propose a novel method of generating fractal three-dimensional porous media geometry. The method is an extension of the two-dimensional midpoint displacement method, used to generate realistic looking terrain for graphics applications, to a third ... Keywords: Fractal, Periodic boundary conditions, Porous media generation

Jonathan Jilesen; Jim Kuo; Fue-Sang Lien

2012-09-01T23:59:59.000Z

340

Stopper-Bearing System – A Solution to Displacement Control of Bridge Decks  

E-Print Network (OSTI)

Bridges play an important role in society, especially during the post-earthquake period that enables emergency vehicles and traffic for safe egress and ingress to minimize the loss of property and life. However, some past earthquakes have resulted in large horizontal displacements on the superstructure that have lead to unseating of bridge spans and unexpected pounding forces that damaged critical components such as bearings and anchor bolts. To this end, a new bearing system, referred to as a stopperbearing system (SBS), is proposed as one solution to address the vulnerability of bridge bearings and other components. The horizontal displacement of a deck can be limited to a desired range using the SBS. The nonlinear load-deformation behavior of the SBS is obtained from ABAQUS and used to define the SBS within reinforced concrete analytical bridge models developed in SAP2000, which are subjected to the 1999 Chi- Chi, Taiwan earthquake ground motion (1.01g - E-W component and 0.43g - N-S component). The results from the nonlinear time history analyses show that the SBS is effective in limiting bridge deck displacements and pounding effects. Preliminary analytical modeling of the SBS shows promise as a solution to displacement control of bridge decks for overall enhancement of bridge performance during seismic events.

Tsai, Yi-Te

2009-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "acoustics displacement flow" 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

Behaviour of oil ganglia displaced by a surfactant solution in a porous medium  

E-Print Network (OSTI)

L-97 Behaviour of oil ganglia displaced by a surfactant solution in a porous medium J. C. Moulu'importance relative des forces de viscosité et des forces capillaires. Abstract. 2014 The velocity of oil ganglia residual oil phase by water injection in a porous medium [1, 2]. These studies have demonstrated

Paris-Sud XI, Université de

342

Vertical displacement of the storage ring floor due to building distortion in the Photon Factory  

Science Conference Proceedings (OSTI)

The Light Source Building of the Photon Factory was found to distort so much as to induce the displacement of magnets in the storage ring. This resulted in drifting of the beam orbit. It was considered that the building was distorted by the variations of thermal stress

Tomotaro Katsura; Yutaka Fujita

1991-01-01T23:59:59.000Z

343

PREDICTION OF SURFACE SETTLEMENT DUE TO THE DISPLACEMENT OF SOFT ZONES  

Science Conference Proceedings (OSTI)

In areas composed of coastal plain sediments, soft zones subjected to partial overburden may be present in the subsurface. During or after a seismic event, these soft zones may be compressed. The resulting displacement due to the deformation of the soft zones will propagate to the ground surface and cause the surface to settle. This paper presents a method to predict the settlement at the surface due to the propagation of the displacement from the soft zones. This method is performed by discretizing the soft zones into multiple clusters of finite sub-areas or subspaces. Settlement profile at the ground surface due to the displacement of each sub-area or subspace is computed assuming the shape is a normal distribution function. Settlement due to the displacement of the soft zones can then be approximated by adding the settlements computed for all the sub-areas or subspaces. This method provides a simple and useful tool for the prediction of the settlement profile and the results are consistent with those obtained from the finite difference analysis.

Li, W

2008-03-03T23:59:59.000Z

344

Determination of the displacement energy of O, Si and Zr under electron beam irradiation  

Science Conference Proceedings (OSTI)

The response of nanocrystalline, stabilizer-free cubic zirconia thin films on a Si substrate to electron beam irradiation with energies of 4, 110 and 200 keV and fluences up to {approx}1.5 x 10{sup 22} e m{sup -2} has been studied to determine the displacement energies. The 110 and 200 keV irradiations were performed in situ using a transmission electron microscope; the 4 keV irradiations were performed ex situ using an electron gun. In all three irradiations, no structural modification of the zirconia was observed, despite the high fluxes and fluences. However the Si substrate on which the zirconia film was deposited was amorphized under the 200 keV electron irradiation. Examination of the electron-solid interactions reveals that the kinetic energy transfer from the 200 keV electrons to the silicon lattice is sufficient to cause atomic displacements, resulting in amorphization. The kinetic energy transfer from the 200 keV electrons to the oxygen sub-lattice of the zirconia may be sufficient to induce defect production, however, no evidence of defect production was observed. The displacement cross-section value of Zr was found to be {approx}400 times greater than that of O indicating that the O atoms are effectively screened from the electrons by the Zr atoms, and, therefore, the displacement of O is inefficient.

Edmondson, Philip D [ORNL; Weber, William J [ORNL; Namavar, Fereydoon [University of Nebraska Medical Center; Zhang, Yanwen [ORNL

2012-01-01T23:59:59.000Z

345

Displacing entanglement back and forth between the micro and macro domains  

E-Print Network (OSTI)

Quantum theory is often presented as the theory describing the microscopic world, and admittedly, it has done this extremely well for decades. Nonetheless, the question of whether it applies at all scales and in particular at human scales remains open, despite considerable experimental effort. Here, we report on the displacement of quantum entanglement into the domain where it involves two macroscopically distinct states, i.e. two states characterised by a large enough number of photons to be seen, at least in principle, with our eyes and that could be distinguished using mere linear - coarse-grained - detectors with a high probability. Specifically, we start by the generation of entanglement between two spatially separated optical modes at the single photon level and subsequently displace one of these modes up to almost a thousand photons. To reliably check whether entanglement is preserved, the mode is re-displaced back to the single photon level and a well established entanglement measure, based on single photon detection, is performed. The ability to displace an entangled state from the micro to the macro domain and back again provides a fascinating tool to probe fundamental questions about quantum theory and holds potential for more applied problems such as quantum sensing.

Natalia Bruno; Anthony Martin; Pavel Sekatski; Nicolas Sangouard; Rob Thew; Nicolas Gisin

2012-12-15T23:59:59.000Z

346

Transformation elastodynamics and active exterior acoustic cloaking  

E-Print Network (OSTI)

This chapter consists of three parts. In the first part we recall the elastodynamic equations under coordinate transformations. The idea is to use coordinate transformations to manipulate waves propagating in an elastic material. Then we study the effect of transformations on a mass-spring network model. The transformed networks can be realized with "torque springs", which are introduced here and are springs with a force proportional to the displacement in a direction other than the direction of the spring terminals. Possible homogenizations of the transformed networks are presented, with potential applications to cloaking. In the second and third parts we present cloaking methods that are based on cancelling an incident field using active devices which are exterior to the cloaked region and that do not generate significant fields far away from the devices. In the second part, the exterior cloaking problem for the Laplace equation is reformulated as the problem of polynomial approximation of analytic functions. An explicit solution is given that allows to cloak larger objects at a fixed distance from the cloaking device, compared to previous explicit solutions. In the third part we consider the active exterior cloaking problem for the Helmholtz equation in 3D. Our method uses the Green's formula and an addition theorem for spherical outgoing waves to design devices that mimic the effect of the single and double layer potentials in Green's formula.

Fernando Guevara Vasquez; Graeme W. Milton; Daniel Onofrei; Pierre Seppecher

2011-05-06T23:59:59.000Z

347

ASSESSMENT OF THE RELEVANCE OF DISPLACEMENT BASED DESIGN METHODS/CRITERIA TO NUCLEAR PLANT STRUCTURES.  

Science Conference Proceedings (OSTI)

Revisions to the USNRC Regulatory Guides and Standard Review Plan Sections devoted to earthquake engineering practice are currently in process. The intent is to reflect changes in engineering practice that have evolved in the twenty years that have passed since those criteria were originally published. Additionally, field observations of the effects of the Northridge (1994) and Kobe (1995) earthquakes have inspired some reassessment in the technical community about certain aspects of design practice. In particular, questions have arisen about the effectiveness of basing earthquake resistant designs on resistance to seismic forces and, then evaluating tolerability of the expected displacements. Therefore, a research effort was undertaken to examine the implications for NRC's seismic practice of the move, in the earthquake engineering community, toward using expected displacement rather than force (or stress) as the basis for assessing design adequacy. The results of the NRC sponsored research on this subject are reported in this paper. A slow trend toward the utilization of displacement based methods for design was noted. However, there is a more rapid trend toward the use of displacement based methods for seismic evaluation of existing facilities. A document known as FEMA 273, has been developed and is being used as the basis for the design of modifications to enhance the seismic capability of existing non-nuclear facilities. The research concluded that displacement based methods, such as given in FEMA 273, may be useful for seismic margin studies of existing nuclear power stations. They are unlikely to be useful for the basic design of new stations since nuclear power stations are designed to remain elastic during a seismic event. They could, however, be useful for estimating the margins associated with that design.

HOFMAYER,C.; MILLER,C.; WANG,Y.; COSTELLO,J.

2001-08-12T23:59:59.000Z

348

Heat-driven acoustic cooling engine having no moving parts  

DOE Patents (OSTI)

A heat-driven acoustic cooling engine having no moving parts receives heat from a heat source. The acoustic cooling engine comprises an elongated resonant pressure vessel having first and second ends. A compressible fluid having a substantial thermal expansion coefficient and capable of supporting an acoustic standing wave is contained in the resonant pressure vessel. The heat source supplies heat to the first end of the vessel. A first heat exchanger in the vessel is spaced-apart from the first end and receives heat from the first end. A first thermodynamic element is adjacent to the first heat exchanger and converts some of the heat transmitted by the first heat exchanger into acoustic power. A second thermodynamic element has a first end located spaced-apart from the first thermodynamic element and a second end farther away from the first thermodynamic element than is its first end. The first end of the second thermodynamic element heats while its second end cools as a consequence of the acoustic power. A second heat exchanger is adjacent to and between the first and second thermodynamic elements. A heat sink outside of the vessel is thermally coupled to and receives heat from the second heat exchanger. The resonant pressure vessel can include a housing less than one-fourth wavelength in length coupled to a reservoir. The housing can include a reduced diameter portion communicating with the reservoir.

Wheatley, John C. (Los Alamos, NM); Swift, Gregory W. (Santa Fe, NM); Migliori, Albert (Santa Fe, NM); Hofler, Thomas J. (Los Alamos, NM)

1989-01-01T23:59:59.000Z

349

EMSL: Capabilities: Subsurface Flow and Transport  

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

dissolution, and multiphase fluid displacement Pore-scale displacement studies of supercritical CO2 Transport of environmental contaminants, including metals, radionuclides, and...

350

Information optimization of distributed net of receivers of acoustic noise type signals  

Science Conference Proceedings (OSTI)

The method for information optimization of distributed net of receivers of acoustic noise type signals is suggested. It is shown, that the network of optimal construction may be represented as sum of groups, containing increasing number of acoustic receiver ...

H. H. Asadov; N. A. Abdullayev; E. A. Ibrahimov; V. M. Garayev; E. Abbaszadeh

2010-09-01T23:59:59.000Z

351

On the Sounding Range of a 1-m Wavelength Radio Acoustic Sounder  

Science Conference Proceedings (OSTI)

The sounding range of a RASS (Radio Acoustic Sounding System) for remote measurement of the atmospheric thermal profile is determined both by the structural peculiarities of the system (wavelength, size of antennas, acoustic and radar power, etc.)...

G. Bonino; P. Trivero; G. Elisei; A. Marzorati

1989-10-01T23:59:59.000Z

352

Understanding and utilizing waveguide invariant range-frequency striations in ocean acoustic waveguides  

E-Print Network (OSTI)

Much of the recent research in ocean acoustics has focused on developing methods to exploit the effects that the sea surface and seafloor have on acoustic propagation. Many of those methods require detailed knowledge of ...

Cockrell, Kevin L

2011-01-01T23:59:59.000Z

353

A Comparative Analysis and Experimental Study on Wireless Aerial and Underwater Acoustic Communications  

Science Conference Proceedings (OSTI)

Widely available speakers and microphones in electronic devices motivate the use of generic audio hardware to establish acoustic communication links. Acoustic communication with generic hardware requires software modems for data modulation and demodulation. ...

Raja Jurdak; Cristina Videira Lopes; Pedro M. Q. Aguiar; Pierre Baldi

2006-08-01T23:59:59.000Z

354

Microsoft PowerPoint - Subsea_Acoustics v5.ppt  

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

Acoustic Impacts on Marine Mammals Acoustic Impacts on Marine Mammals from Subsea Oil & Gas Processing DOE Strategy to Address Noise from Subsea Petroleum Processing Technologies DOE Strategy to Address Noise from Subsea Petroleum Processing Technologies Noise Types & Thresholds High Level, Intermittent Low Level, Continuous MMS Workshop Nov. 17-19, 2009 Boston, MA Marine Mammals and Noise Marine Mammal Commission March 2007 Advisory Committee on Acoustic Impacts on Marine Mammals Marine Mammal Commission February 2006 Effects of Subsea Processing on Deepwater Environments in the Gulf of Mexico Minerals Management Service May 2008 Addressing the Effects of Human- Generated Sound on Marine Life Joint Subcommittee on Ocean Science & Technology (JSOST) January 2009 Facilities Utilizing Subsea Petroleum Processing Technologies

355

Analogue Transformations in Physics and their Application to Acoustic  

E-Print Network (OSTI)

Transformation optics has shaped up a revolutionary electromagnetic design paradigm, enabling scientists to build astonishing devices such as invisibility cloaks. Unfortunately, the application of transformation techniques to other branches of physics is often constrained by the structure of the field equations. We develop here a complete transformation method using the idea of analogue spacetimes. The method is general and could be considered as a new paradigm for controlling waves in different branches of physics, from acoustics in quantum fluids to graphene electronics. As an application, we derive an "analogue transformation acoustics" formalism that naturally allows the use of transformations mixing space and time or involving moving fluids, both of which were impossible with the standard approach. To demonstrate the power of our method, we give an explicit design of a spacetime compressor for acoustic waves and a carpet cloak for a moving aircraft.

C. García-Meca; S. Carloni; C. Barceló; G. Jannes; J. Sánchez-Dehesa; A. Martínez

2013-06-21T23:59:59.000Z

356

Microsoft Word - Acoustic Sensor for Pipeline Monitoring_Revised.do  

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

LA-UR-05-6025 LA-UR-05-6025 Approved for public release; distribution is unlimited. Title: Acoustic Sensor for Pipeline Monitoring: Technology Report Author(s): Dipen N. Sinha Submitted to: Gas Technology Management Division Strategic Center for Natural Gas and Oil National Energy Technology Laboratory 2 Acoustic Sensor for Pipeline Monitoring: Technology Report Dipen Sinha Los Alamos National Laboratory July 20, 2005 Executive Summary This report presents detailed information on the effort to develop acoustic sensing technologies for natural gas pipe line monitoring. It starts with a historical evolution of the project and ends with the current status. The various technical accomplishments during this effort are pointed out. The latest technique involves the use of Lamb wave propagation in the wall of a pipe generated in a stand-off manner for defect detection. The report presents

357

Impedance matched joined drill pipe for improved acoustic transmission  

DOE Patents (OSTI)

An impedance matched jointed drill pipe for improved acoustic transmission. A passive means and method that maximizes the amplitude and minimize the temporal dispersion of acoustic signals that are sent through a drill string, for use in a measurement while drilling telemetry system. The improvement in signal transmission is accomplished by replacing the standard joints in a drill string with joints constructed of a material that is impedance matched acoustically to the end of the drill pipe to which it is connected. Provides improvement in the measurement while drilling technique which can be utilized for well logging, directional drilling, and drilling dynamics, as well as gamma-ray spectroscopy while drilling post shot boreholes, such as utilized in drilling post shot boreholes.

Moss, William C. (San Mateo, CA)

2000-01-01T23:59:59.000Z

358

A broadband underwater acoustic modem implementation using coherent OFDM  

E-Print Network (OSTI)

Abstract — Multicarrier modulation in the form of orthogonal frequency division multiplexing (OFDM) has prevailed in recent broadband wireless systems over radio channels. In this senior design project, we have implemented an acoustic OFDM modem that transmits digital data through sound propagation. We have demonstrated OFDM transmission first in air, and then in water. We find that the underwater channel is much more complex than the air channel, and careful signal designs are needed for underwater transmissions. We have also handled another difficulty incurred by sampling rate mismatches at the transmitter and the receiver due to low-cost sampling devices. With two-way communication capabilities, this project provides a simple online chatting tool between two computers relying on acoustic links. Index Terms — OFDM, multicarrier transmission, underwater acoustic communication.

Sean Mason; Robert Anstett; Nicoletti Anicette; Shengli Zhou

2007-01-01T23:59:59.000Z

359

Drift and ion acoustic wave driven vortices with superthermal electrons  

SciTech Connect

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

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

2012-08-15T23:59:59.000Z

360

Use of high performance computing resources for underwater acoustic modeling.  

Science Conference Proceedings (OSTI)

The majority of standard underwater propagation models provide a two?dimensional (range and depth) acoustic field for a single frequency point source. Computational resource demand increases considerably when the three?dimensional acoustic field of a broad?band spatially extended source is of interest. An upgrade of the standard parabolic equationmodel RAM for use in a high?performance computing (HPC) environment is discussed. A benchmarked upgraded version of RAM is used in the Louisiana Optical Network Initiative HPC?environment to model the three?dimensional acoustic field of a seismic airgun array. Four?dimensional visualization (time and space) of the generated data volume is also addressed. [Research supported by the Louisiana Optical Network Initiative

Anca M. Niculescu; Natalia A. Sidorovskaia; Peter Achi; Arslan M. Tashmukhambetov; George E. Ioup; Juliette W. Ioup

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "acoustics displacement flow" 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

Acoustic Logs At Coso Geothermal Area (2005) | Open Energy Information  

Open Energy Info (EERE)

Coso Geothermal Area (2005) Coso Geothermal Area (2005) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Acoustic Logs Activity Date 2005 Usefulness not indicated DOE-funding Unknown Exploration Basis Well bore fracture analysis Notes Electrical and acoustic image logs have been collected from well 58A-10 in crystalline rock on the eastern margin. Electrical image logs appear to be sensitive to variations in mineralogy, porosity, and fluid content that highlight both natural fractures and rock fabrics. These fabric elements account for about 50% of the total population of planar structures seen in the electrical image log, but locally approach 100%. Acoustic image logs reveal a similar natural fracture population, but generally image slightly fewer fractures, and do not reveal rock fabric. Both logs also record

362

Investigation of Multiscale and Multiphase Flow, Transport and Reaction in Heavy Oil Recovery Processes  

Science Conference Proceedings (OSTI)

This project is an investigation of various multi-phase and multiscale transport and reaction processes associated with heavy oil recovery. The thrust areas of the project include the following: Internal drives, vapor-liquid flows, combustion and reaction processes, fluid displacements and the effect of instabilities and heterogeneities and the flow of fluids with yield stress. These find respective applications in foamy oils, the evolution of dissolved gas, internal steam drives, the mechanics of concurrent and countercurrent vapor-liquid flows, associated with thermal methods and steam injection, such as SAGD, the in-situ combustion, the upscaling of displacements in heterogeneous media and the flow of foams, Bingham plastics and heavy oils in porous media and the development of wormholes during cold production.

Yortsos, Yanis C.

2001-08-07T23:59:59.000Z

363

Acoustical prediction methods for heating, ventilating, and air?conditioning (HVAC) systems  

Science Conference Proceedings (OSTI)

The goal of this project is to compare and contrast various aspects of acoustical prediction methods for heating

2005-01-01T23:59:59.000Z

364

Improved Fluid Flow Measurements: Feedwater Flow  

Science Conference Proceedings (OSTI)

This report describes the combined results of a utility survey and site visits concerning feedwater flow measurement in fossil-fueled power plants. In addition, a summary is provided of the technologies available to measure the volumetric feedwater flow rate in plants. This volumetric flow rate can be converted to a mass flow rate by knowing the pressure and temperature of the flow media. Velocity meters, differential pressure meters, and other closed-conduit flowmeters are discussed along with ...

2012-11-28T23:59:59.000Z

365

Numerical Investigation of Fractured Reservoir Response to Injection/Extraction Using a Fully Coupled Displacement Discontinuity Method  

E-Print Network (OSTI)

In geothermal reservoirs and unconventional gas reservoirs with very low matrix permeability, fractures are the main routes of fluid flow and heat transport, so the fracture permeability change is important. In fact, reservoir development under this circumstance relies on generation and stimulation of a fracture network. This thesis presents numerical simulation of the response of a fractured rock to injection and extraction considering the role of poro-thermoelasticity and joint deformation. Fluid flow and heat transport in the fracture are treated using a finite difference method while the fracture and rock matrix deformation are determined using the displacement discontinuity method (DDM). The fractures response to fluid injection and extraction is affected both by the induced stresses as well as by the initial far-field stress. The latter is accounted for using the non-equilibrium condition, i.e., relaxing the assumption that the rock joints are in equilibrium with the in-situ stress state. The fully coupled DDM simulation has been used to carry out several case studies to model the fracture response under different injection/extractions, in-situ stresses, joint geometries and properties, for both equilibrium and non-equilibrium conditions. The following observations are made: i) Fluid injection increases the pressure causing the joint to open. For non-isothermal injection, cooling increases the fracture aperture drastically by inducing tensile stresses. Higher fracture aperture means higher conductivity. ii) In a single fracture under constant anisotropic in-situ stress (non-equilibrium condition), permanent shear slip is encountered on all fracture segments when the shear strength is overcome by shear stress in response to fluid injection. With cooling operation, the fracture segments in the vicinity of the injection point are opened due to cooling-induced tensile stress and injection pressure, and all the fracture segments experience slip. iii) Fluid pressure in fractures increases in response to compression. The fluid compressibility and joint stiffness play a role. iv) When there are injection and extraction in fractured reservoirs, the cooler fluid flows through the fracture channels from the injection point to extraction well extracting heat from the warmer reservoir matrix. As the matrix cools, the resulting thermal stress increases the fracture apertures and thus increases the fracture conductivity. v) Injection decreases the amount of effective stress due to pressure increase in fracture and matrix near a well. In contrast, extraction increases the amount of effective stress due to pressure drop in fracture and matrix.

Lee, Byungtark

2011-08-01T23:59:59.000Z

366

An accurate tangential forcedisplacement model for granular-flow simulations: Contacting spheres with  

E-Print Network (OSTI)

is consistent with the elasto-plastic normal force­displacement (NFD) model presented in [ASME Journal-Quoc). URL: http://www.mae.ufl.edu/~vql. 1 Now with Parametric Technology Corp. (PTC), Needham, MA. 2 Now of the flow, play a crucial role. It has been amply demonstrated in [6] that an accurate tangential force

Vu-Quoc, Loc

367

Dust Acoustic Shock Waves in Adiabatic Hot Dusty Plasmas  

Science Conference Proceedings (OSTI)

It is known that to have a monotonic or oscillatory shock wave a source of dissipation is needed. In this study, we considered the dust charge variation as a source of dissipation. By using the reductive perturbation technique, the nonlinear Burgers equation is derived and the shock-like solution is determined. The effects of dust temperature on different characteristics of dust acoustic shock wave are discussed. It is found out that dust thickness is not affected by dust temperature while for every dusty plasma systems there is dust critical temperature T{sub dc}, for which the dust acoustic shock height will be maximum.

Asgari, H.; Muniandy, S. V.; Wong, C. S. [Plasma Research Laboratory, Department of Physics, University of Malaya, 50603 Kuala Lumpur (Malaysia)

2011-03-30T23:59:59.000Z

368

Structural morphology of acoustically levitated and heated nanosilica droplet  

SciTech Connect

We study the vaporization and precipitation dynamics of a nanosilica encapsulated water droplet by levitating it acoustically and heating it with a CO{sub 2} laser. For all concentrations, we observe three phases: solvent evaporation, surface agglomeration, and precipitation leading to bowl or ring shaped structures. At higher concentrations, ring reorientation and rotation are seen consistently. The surface temperature from an infrared camera is seen to be dependent on the final geometrical shape of the droplet and its rotation induced by the acoustic field of the levitator. With nonuniform particle distribution, these structures can experience rupture which modifies the droplet rotational speed.

Kumar, Ranganathan; Tijerino, Erick; Saha, Abhishek [Department of Mechanical, Materials and Aerospace Engineering, University of Central Florida, Orlando, Florida 32816 (United States); Basu, Saptarshi [Department of Mechanical Engineering, Indian Institute of Science, 560012 Bangalore (India)

2010-09-20T23:59:59.000Z

369

DTW-based Phonetic Alignment Using Multiple Acoustic Features  

E-Print Network (OSTI)

This paper presents the results of our effort in improving the accuracy of a DTW-based automatic phonetic aligner. The adopted model assumes that the phonetic segment sequence is already known and so the goal is only to align the spoken utterance with a reference synthetic signal produced by waveform concatenation without prosodic modifications. Instead of using a single acoustic measure to compute the alignment cost function, our strategy uses a combination of acoustic features depending on the pair of phonetic segment classes being aligned. The results show that this strategy considerably reduces the segment boundary location errors, even when aligning synthetic and natural speech signals of different gender speakers.

Sérgio Paulo; Luís C. Oliveira

2003-01-01T23:59:59.000Z

370

Feasibility of impact-acoustic emissions for detection of damaged wheat kernels  

Science Conference Proceedings (OSTI)

A non-destructive, real time device was developed to detect insect damage, sprout damage, and scab damage in kernels of wheat. Kernels are impacted onto a steel plate and the resulting acoustic signal analyzed to detect damage. The acoustic signal was ... Keywords: Acoustic emissions, Insect damage kernels, Neural network, Sorting, Spectral analysis

Tom C. Pearson; A. Enis Cetin; Ahmed H. Tewfik; Ron P. Haff

2007-05-01T23:59:59.000Z

371

Investigating acoustic cues in automatic detection of learners' emotion from auto tutor  

Science Conference Proceedings (OSTI)

This study investigates the emotion-discriminant ability of acoustic cues from speech collected in the automatic computer tutoring system named as Auto Tutor. The purpose of this study is to examine the acoustic cues for emotion detection of the speech ... Keywords: acoustic features, auto tutor, emotion detection, humancomputer interaction, speech

Rui Sun; Elliot Moore

2011-10-01T23:59:59.000Z

372

Early Tube Leak Detection in a HRSG Application Using Acoustic Monitoring Technology  

Science Conference Proceedings (OSTI)

Acoustic monitoring has become an essential part of early tube leak detection for conventional boilers. Acoustic monitoring is intended for steam leak detection in pressurized vessels, including power boilers, recovery boilers, and feedwater heaters. The system performs acoustic monitoring by continuously measuring the internal sounds from the boiler, signaling an alarm when the sound exceeds a preset threshold for a ...

2012-12-12T23:59:59.000Z

373

A Comparative Analysis and Experimental Study on Wireless Aerial and Underwater Acoustic  

E-Print Network (OSTI)

A Comparative Analysis and Experimental Study on Wireless Aerial and Underwater Acoustic underwater acoustic sensor networks through the use of audio hardware built in to the sensor modules. In this paper, we explore the potential of the acoustic communication system for both aerial and underwater

Lopes, Cristina Videira

374

Analysis of Acoustic Signatures from Moving Vehicles UsingTime-Varying Autoregressive Models  

Science Conference Proceedings (OSTI)

Time-varying autoregressive (TVAR) modeling approach for the analysis of acoustic signatures from moving vehicles is presented in this paper. Acoustic signatures from moving vehicles are nonstationary, and features extracted under the stationary ... Keywords: acoustic, classification, time-varying autoregressive model, time-varying, vehicle identification

Kie B. Eom

1999-10-01T23:59:59.000Z

375

Electrostatic drift-wave instability in a nonuniform quantum magnetoplasma with parallel velocity shear flows  

SciTech Connect

The propagation of high and low frequency (in comparison with the cyclotron frequency) electrostatic drift-waves is investigated in a nonuniform, dense magnetoplasma (composed of electrons and ions), in the presence of parallel shear flow, by employing the quantum magnetohydrodynamic (QMHD) model. Using QMHD model, a new set of equations is presented in order to investigate linear properties of electrostatic drift-waves with sheared plasma flows for dense plasmas. In this regard, dispersion relations for coupled electron-thermal and drift-ion acoustic modes are derived and several interesting limiting cases are discussed. For instance, it is found that sheared ion flow parallel to the external magnetic field can drive the quantum drift-ion acoustic wave unstable, etc. The present investigation may have relevance in dense astrophysical environments where quantum effects are significant.

Tariq, Sabeen; Mirza, Arshad M. [Department of Physics, Theoretical Plasma Physics Group, Quaid-i-Azam University, Islamabad 45320 (Pakistan); Masood, W. [Theoretical Plasma Physics Division, PINSTECH, P.O. Box. Nilore, Islamabad 44000, Pakistan and National Center for Physics (NCP), Islamabad 45320 (Pakistan)

2010-10-15T23:59:59.000Z

376

System and method for characterizing voiced excitations of speech and acoustic signals, removing acoustic noise from speech, and synthesizing speech  

DOE Patents (OSTI)

The present invention is a system and method for characterizing human (or animate) speech voiced excitation functions and acoustic signals, for removing unwanted acoustic noise which often occurs when a speaker uses a microphone in common environments, and for synthesizing personalized or modified human (or other animate) speech upon command from a controller. A low power EM sensor is used to detect the motions of windpipe tissues in the glottal region of the human speech system before, during, and after voiced speech is produced by a user. From these tissue motion measurements, a voiced excitation function can be derived. Further, the excitation function provides speech production information to enhance noise removal from human speech and it enables accurate transfer functions of speech to be obtained. Previously stored excitation and transfer functions can be used for synthesizing personalized or modified human speech. Configurations of EM sensor and acoustic microphone systems are described to enhance noise cancellation and to enable multiple articulator measurements.

Burnett, Greg C. (Livermore, CA); Holzrichter, John F. (Berkeley, CA); Ng, Lawrence C. (Danville, CA)

2006-08-08T23:59:59.000Z

377

System And Method For Characterizing Voiced Excitations Of Speech And Acoustic Signals, Removing Acoustic Noise From Speech, And Synthesizi  

DOE Patents (OSTI)

The present invention is a system and method for characterizing human (or animate) speech voiced excitation functions and acoustic signals, for removing unwanted acoustic noise which often occurs when a speaker uses a microphone in common environments, and for synthesizing personalized or modified human (or other animate) speech upon command from a controller. A low power EM sensor is used to detect the motions of windpipe tissues in the glottal region of the human speech system before, during, and after voiced speech is produced by a user. From these tissue motion measurements, a voiced excitation function can be derived. Further, the excitation function provides speech production information to enhance noise removal from human speech and it enables accurate transfer functions of speech to be obtained. Previously stored excitation and transfer functions can be used for synthesizing personalized or modified human speech. Configurations of EM sensor and acoustic microphone systems are described to enhance noise cancellation and to enable multiple articulator measurements.

Burnett, Greg C. (Livermore, CA); Holzrichter, John F. (Berkeley, CA); Ng, Lawrence C. (Danville, CA)

2006-04-25T23:59:59.000Z

378

DOE Hydrogen and Fuel Cells Program Record 5003: Carbon Displacement Using Net-Zero Carbon Sources  

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

3 Date: January 4, 2006 3 Date: January 4, 2006 Title: Carbon Displacement Using Net-Zero Carbon Sources Originator: Elvin Yuzugullu Approved by: JoAnn Milliken Date: April 4, 2006 Item: "... if 175 billion kWh of grid electricity (10% of the growth of the electric generation market in 2025) is replaced by fuel cells operating on hydrogen at 50% LHV efficiency, about 10.5 million tons of hydrogen would be needed. If this hydrogen were made from a non-carbon (e.g. nuclear) or net-zero carbon (e.g. biomass, coal with carbon sequestration) source, then it could potentially displace about 27.5 million tons of carbon." Calculations/References: Analysis by TIAX for DOE, August 24, 2005: * "10.5 million tons of hydrogen" Required H 2 = 175 billion kWhe

379

Apparent spatial blurring and displacement of a point optical source due to cloud scattering  

Science Conference Proceedings (OSTI)

A Monte Carlo algorithm is used to determine the apparent spatial blurring of a terrestrial 1.07 micron optical point source due to cloud scattering as seen from space. The virtual image of a point source over a virtual source plane area 22.4 x 22.4 square kilometers arising from cloud scattering was determined for stratus clouds (NASA cloud number 5) and altostratus clouds optical source arises from photon scattering by cloud water droplets. Displacement of the virtual source is due to the apparent illumination of the cloud top region directly about the actual source which when viewed at a nonzero look angle gives a projected displacement of the apparent source relative to the actual source. These features are quantified by an analysis of the Monte Carlo computational results.

Brower, K.L.

1997-09-01T23:59:59.000Z

380

Performance of Quantum Key Distribution Protocol with Dual-Rail Displaced Photon States  

E-Print Network (OSTI)

We propose a scheme for quantum key distribution (QKD) protocol with dual-rail displaced photon states. Displaced single photon states carry bit value of code which may be extracted while coherent states carry nothing and they only provide inconclusive outcome. Developed QKD protocol works with experimental attendant noise to observe presence of malicious Eve. Pulses with large amplitudes unlike conventional QKD relying on faint laser pulses are used that may approximate it to standard telecommunication communication and may show resistance to eavesdropping even in settings with high attenuation. Information leakage to the eavesdropper is determined from comparison of output distribution of the outcomes with ideal one that is defined by two additional inaccessible to nobody, saving for who sends the pulses, parameters. Robustness to some possible eavesdropping attacks is shown.

Sergey A. Podoshvedov

2009-05-13T23:59:59.000Z

Note: This page contains sample records for the topic "acoustics displacement flow" 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

MIGRANTS IN FLIGHT: CONFLICT-INDUCED INTERNAL DISPLACEMENT OF NEPALIS IN NORTHEAST INDIA  

E-Print Network (OSTI)

of the sturdy and industrious Nepalis entered Bhutan, on the invitation of the Raja, with British encouragement to clear the Duars or the foothills of Southern Bhutan, while others came in search of cultivable land. In 1909 a British officer noted with some... worry in a backward region of India, as well as the seemingly deliberate attempts of the ethnic movements to loosely define the term 'foreigner'. They have suffered large-scale evictions and internal displacement. This paper looks at the conflict...

Nath, Lopita

2005-01-01T23:59:59.000Z

382

Optimization of displacement-measuring quadrature interferometers considering the real properties of optical components  

SciTech Connect

We present the influence of alignment and the real properties of optical components on the performance of a two-detector homodyne displacement-measuring quadrature laser interferometer. An experimental method, based on the optimization of visibility and sensitivity, was established and theoretically described to assess the performance and stability of the interferometer. We show that the optimal performance of such interferometers is achieved with the iterative alignment procedure described.

Pozar, Tomaz; Gregorcic, Peter; Mozina, Janez

2011-03-20T23:59:59.000Z

383

Triggers for displaced decays of long-lived neutral particles in the ATLAS detector  

E-Print Network (OSTI)

A set of three dedicated triggers designed to detect long-lived neutral particles decaying throughout the ATLAS detector to a pair of hadronic jets is described. The efficiencies of the triggers for selecting displaced decays as a function of the decay position are presented for simulated events. The effect of pile-up interactions on the trigger efficiencies and the dependence of the trigger rate on instantaneous luminosity during the 2012 data-taking period at the LHC are discussed.

ATLAS Collaboration

2013-05-10T23:59:59.000Z

384

The Sun's displacement from the galactic plane from spectroscopic parallaxes of 2400 OB stars  

E-Print Network (OSTI)

The Sun's vertical displacement from the galactic plane is determined model-independently from 3457 spectroscopic-parallax distance estimates for 2397 OB stars within 1200 pc of the Sun. The result, 19.5 +/- 2.2 pc, agrees well with other recent determinations. The distribution of stellar z-values with galactic longitude shows a slight sinusoidal dependence with an amplitude of about 26 pc.

B. Cameron Reed

2005-07-28T23:59:59.000Z

385

Visualization and simulation of immiscible displacement in fractured systems using micromodels: Steam injection  

SciTech Connect

A study of steam and hot water injection processes in micromodel geometries that mimic a matrix-fracture system was undertaken. The followings were observed: Light components existing in the crude oil generated a very high efficient gas-drive at elevated temperatures. This gas generation in conjunction with natural surfactant existing in the crude oil, lead to the formation of a foam in the fracture and to improved displacement in the matrix. We observed that the steam enters the fracture and the matrix depending on whether the steam rate exceeds or not the critical values. The resulting condensed water also moves preferentially into the matrix or the fracture depending on the corresponding capillary number. Since steam is a non-wetting phase as a vapor, but becomes a wetting phase when condensed in a water-wet system, steam injection involves both drainage and imbibition. It was found that all of the oil trapped by the condensed water can be mobilized and recovered when in contact with steam. We also examined hot-water displacement. In comparison with cold-water experiments at the same capillary number, a higher sweep efficiency for both light and heavy oils was observed. It was found that the loam generated in the fracture during hot-water injection, is more stable than in steamflooding. Nonetheless, hot-water injection resulted into less efficient displacement in its absence.

Yortsos, Y.C.

1995-07-01T23:59:59.000Z

386

Experimental Study of the Floor Radiant Cooling System Combined with Displacement Ventilation  

E-Print Network (OSTI)

As a comfortable and energy-efficient air conditioning system, the application of floor radiant heating system is used increasingly greatly in the north of China. As a result, the feasibility of floor radiant cooling has gained more attention. To examine the thermodynamic performance of the floor radiant cooling system, we measured the operational conditions including the minimum floor surface temperature, the cooling capacity, and the indoor temperature field distribution under different outdoor temperatures in Beijing. Because the ground temperature changes with the mean temperature of the supplied and returned water and room temperature, the mean temperature of the supplied and retuned water was obtained. Finally, we analyzed the phenomenon of dewing and developed measures for preventing it. The dry air layer near the floor formed by a displacement ventilation system can effectively prevent dews on the surface of the floor in the wet and hot days in summer. In addition, for the sake of the displacement ventilation system, the heat transfer effect between floor and space is enhanced. Our analysis pointed out that floor radiant cooling system combined with displacement ventilation ensures good comfort and energy efficiency.

Ren, Y.; Li, D.; Zhang, Y.

2006-01-01T23:59:59.000Z

387

The Effect of Vertical Upward Flow on Thermal Plumes  

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

The Effect of Vertical Upward Flow on Thermal Plumes The Effect of Vertical Upward Flow on Thermal Plumes Speaker(s): Pierre S. Farrugia Date: November 18, 2010 - 12:05pm Location: 90-3122 Seminar Host/Point of Contact: David Lorenzetti Thermal plumes have been widely investigated in a variety of scenarios, including natural convection and stratified environments. The resulting theory may be used to predict ventilation flow rates in, for example, natural and displacement ventilation, and under-floor air distribution (UFAD) systems. However, there has been little effort in investigating how uniform upward flows affect the plume velocity, rate of growth, and thermal profile. Such situations can arise if, for example, the diffusers of a UFAD system are evenly distributed. In order to study such situations, analytical expressions for the velocity and temperature profiles of a plume

388

Distribution of small dispersive coal dust particles and absorbed radioactive chemical elements in conditions of forced acoustic resonance in iodine air filter at nuclear power plant  

E-Print Network (OSTI)

The physical features of distribution of the small dispersive coal dust particles and the adsorbed radioactive chemical elements and their isotopes in the absorber with the granular filtering medium with the cylindrical coal granules were researched in the case of the intensive air dust aerosol stream flow through the iodine air filter (IAF). It was shown that, at the certain aerodynamic conditions in the IAF, the generation of the acoustic oscillations is possible. It was found that the acoustic oscillations generation results in an appearance of the standing acoustic waves of the air pressure (density) in the IAF. In the case of the intensive blow of the air dust aerosol, it was demonstrated that the standing acoustic waves have some strong influences on both: 1) the dynamics of small dispersive coal dust particles movement and their accumulation in the IAF; 2) the oversaturation of the cylindrical coal granules by the adsorbed radioactive chemical elements and their isotopes in the regions, where the antinodes of the acoustic waves are positioned. Finally, we completed the comparative analysis of the theoretical calculations with the experimental results, obtained for the cases of: 1) the experimental aerodynamic modeling of physical processes of the absorbed radioactive chemical elements and their isotopes distribution in the IAF; and 2) the gamma-activation spectroscopy analysis of the absorbed radioactive chemical elements and their isotopes distribution in the IAF. We made the innovative propositions on the necessary technical modifications with the purpose to improve the IAF technical characteristics and increase its operational time at the nuclear power plant (NPP), going from the completed precise characterization of the IAF parameters at the long term operation.

Oleg P. Ledenyov; Ivan M. Neklyudov

2013-06-14T23:59:59.000Z

389

Photo of the Week: Acoustic Levitation for Medicine | Department of Energy  

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

Acoustic Levitation for Medicine Acoustic Levitation for Medicine Photo of the Week: Acoustic Levitation for Medicine October 19, 2012 - 2:08pm Addthis This acoustic levitator was originally developed to help NASA simulate microgravity conditions, but now, scientists are using this piece of equipment to study pharmaceutical solutions at the molecular level. At Argonne National Laboratory, droplets are suspended in air between two sets of speakers, which generate sound waves at frequencies slightly above the audible range -- about 22 kilohertz. Learn more about how acoustic levitation is performed and how it helps scientists study pharmaceuticals here. | Photo by Dan Harris, Argonne National Laboratory.

390

Mechanical and Acoustic Studies of Deep Ocean Glass Sphere Implosions  

E-Print Network (OSTI)

Mechanical and Acoustic Studies of Deep Ocean Glass Sphere Implosions P. W. Gorham, M. Rosen, J. W of the instrument package and therefore no knowledge of the cause of the loss. Because the failure rate mooring and the electro-optical power and teleme- try riser cables for survival in the event of implosion

Learned, John

391

An update on acoustics designs for HVAC (Engineering) K. Marriott  

E-Print Network (OSTI)

An update on acoustics designs for HVAC (Engineering) K. Marriott IOA, 29a Ashburton Road, Croydon and Air Conditioning (HVAC) engineer is to engineer ways for keeping these factors under control the HVAC engineer's environmental requirements while minimizing noise generated in the process considering

Paris-Sud XI, Université de

392

Mechanism of acoustic emissions from booming sand dunes  

E-Print Network (OSTI)

The classical elastic mechanics shows that the fundamental frequency of a sand grain chain is similar to the typical frequency of acoustic emission generated by the booming dunes. The "song of dunes" is therefore considered to originate from the resonance of grain chains occurring within a solid layer only several centimeters thick.

Zhen-Ting Wang

2013-05-10T23:59:59.000Z

393

Airborne Insects as Potential Sources of Acoustic Reflectivity  

Science Conference Proceedings (OSTI)

Laboratory measurements of the acoustic backscattering cross sections of a variety of insects at 3.4 kHz are reported. The authors argue from these data, and from what is known (from radar studies) about insect concentrations in the lower ...

J. R. Riley; A. S. Edwards

1997-06-01T23:59:59.000Z

394

Underwater Localization in Sparse 3D Acoustic Sensor Networks  

E-Print Network (OSTI)

Underwater Localization in Sparse 3D Acoustic Sensor Networks Wei Cheng1,2, Amin Y. Teymorian the localization problem in sparse 3D underwater sensor networks. Considering the fact that depth information is typically available for underwater sensors, we transform the 3D underwater positioning problem into its two

Cheng, Xiuzhen "Susan"

395

Signal processing for an acoustically based fetal heart rate monitor  

Science Conference Proceedings (OSTI)

A least?mean?square (lms) linear prediction algorithm has been developed to accomplish detection of fetal heart tones and thereby derive heart rate from a raw signal generated by a previously described passive acoustical sensor array. The desired heart tone signal has a characteristic signature but is of extremely low amplitude and contaminated with noise consisting of large?amplitude maternal heart tones

Robert A. Pretlow; John W. Stoughton

1991-01-01T23:59:59.000Z

396

Ion acoustic solitons in Earth's upward current region  

Science Conference Proceedings (OSTI)

The formation and evolution of ion acoustic solitons in Earth's auroral upward current region are studied using one- and two-dimensional (2D) electrostatic particle-in-cell simulations. The one-dimensional simulations are confined to processes that occur in the auroral cavity and include four plasma populations: hot electrons, H{sup +} and O{sup +} anti-earthward ion beams, and a hot H{sup +} background population. Ion acoustic solitons are found to form for auroral-cavity ion beams consistent with acceleration through double-layer (DL) potentials measured by FAST. A simplified one-dimensional model simulation is then presented in order to isolate the mechanisms that lead to the formation of the ion acoustic soliton. Results of a two-dimensional simulation, which include both the ionosphere and the auroral cavity, separated by a low-altitude DL, are then presented in order to confirm that the soliton forms in a more realistic 2D geometry. The 2D simulation is initialized with a U-shaped potential structure that mimics the inferred shape of the low altitude transition region based on observations. In this simulation, a soliton localized perpendicular to the geomagnetic field is observed to form and reside next to the DL. Finally, the 2D simulation results are compared with FAST data and it is found that certain aspects of the data can be explained by assuming the presence of an ion acoustic soliton.

Main, D. S.; Scholz, C. [Department of Physics, John Brown University, Siloam Springs, Arkansas 72761 (United States); Newman, D. L. [Center for Integrated Plasma Studies, University of Colorado, Boulder, Colorado 80309 (United States); Ergun, R. E. [Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado 80303 (United States)

2012-07-15T23:59:59.000Z

397

Radio Acoustic Sounding with a UHF Volume Imaging Radar  

Science Conference Proceedings (OSTI)

An implementation of a radio acoustic sounding system (RASS) using a UHF volume imaging radar is presented. The volume-imaging ability of the radar permits the study the spatial structure of the RASS echo observing both the diffraction pattern on ...

Paco López Dekker; Stephen J. Frasier

2004-05-01T23:59:59.000Z

398

Performance of a New Generation of Acoustic Current Meters  

Science Conference Proceedings (OSTI)

As part of a program aimed at developing a long-duration, subsurface mooring, known as Ultramoor, several modern acoustic current meters were tested. The instruments with which the authors have the most experience are the Aanderaa RCM11 and the ...

Nelson G. Hogg; Daniel E. Frye

2007-02-01T23:59:59.000Z

399

Concept of Classical and Quantum Free Acoustic Field  

E-Print Network (OSTI)

The concept of classical and quantum free acoustic (FA) field is theoretically considered. The equations of the free acoustic field are derived. They coincide in the mathematical form with Maxwell equations for the free electromagnetic (EM) field. It is accentuated, that the equations in the mathematical form of Maxwell equations for the free EM-field are universal equations of the Nature. They describe any free complex-vector physical field, vector-functions of which are analytical functions. In the case of a free acoustic field, it seems to be the strong indication taking into account the quantum Fermi liquid model of EM-field leading to the existence of phonons, accompanying the process of a photon formation, that FA-field and free EM-field are the display of the single united field, both the components of which can propagate simultaneously [however, with different velocities], for instance, in weakly absorbing media. The theory proposed can be the theoretical basis for the practical realization of superconducting states at high temperature in the materials with the strong interaction of electrons with acoustic field phonons and with microwave photons in magnetic resonance conditions.

Dmitri Yerchuck; Felix Borovik; Alla Dovlatova; Andrey Alexandrov

2013-12-26T23:59:59.000Z

400

Estimation of radial acoustic wave propagation in relative motion  

Science Conference Proceedings (OSTI)

Sound emission and propagation through the moving air in front of aircraft compressors and behind the turbine assemblies is investigated at UPB in a current research program. Results of the sound waves radial propagation in the first stage of the low ... Keywords: acoustics, finite volumes method, relative fluid mechanics, sound pressure level, sound propagation, sound waves, wave modeling

Alina Bogoi; Radu D. Rugescu

2008-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "acoustics displacement flow" 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

Acoustic classification of the state of artificial heart valves  

Science Conference Proceedings (OSTI)

Transthoracic acoustic signals from BSCC (Björk–Shiley convexo–concave) mechanical heart valves implanted in human patients were processed to determine if the valves had separated outflow struts. For normal valves with intact outflow struts it is demonstrated that a time?windowed spectral analysis reveals the resonant frequency of the vibrating strut. The strut

Terry D. Plemons; Michael Hovenga

1995-01-01T23:59:59.000Z

402

Acoustics and Turbulence Related to the Flow over a Flexible Plate ...  

Science Conference Proceedings (OSTI)

Friedrich-Alexander-University Erlangen-Nuremberg, D-91058 Erlangen, Germany ... Department of Sensor Technology (LSE), Friedrich-Alexander-

403

Using Acoustic Emission Principles for Leak Detection on Buried Pipe with Flow  

Science Conference Proceedings (OSTI)

The U.S. nuclear power industry must manage the threat of corrosion in buried and underground piping and tanks, a mandate underscored by the Nuclear Energy Institute’s (NEI’s) industry initiative NEI 09-14, Guideline for the Management of Underground Piping and Tank Integrity. Inspection of pipes to detect degradation is a critical part of corrosion management programs, and the Electric Power Research ...

2012-10-25T23:59:59.000Z

404

Using Acoustic Emission Principles for Leak Detection on Buried Pipe with Flow  

Science Conference Proceedings (OSTI)

The U.S. nuclear power industry is actively managing the threat of corrosion on buried and underground piping and tanks in response to industry initiative NEI 09-14, Guideline for the Management of Underground Piping and Tank Integrity. A key element of these programs is the inspection of pipe to detect degradation.The Electric Power Research Institute (EPRI) has been evaluating and reporting on inspection technologies that may have viability for nuclear buried pipe inspection ...

2013-07-29T23:59:59.000Z

405

A comparison of acoustic thermometry, XBT, TOPEX, and HOT observations of ocean temperature in the northeast Pacific  

Science Conference Proceedings (OSTI)

Time series of temperature have been measured acoustically in the northeast Pacific as part of the Acoustic Thermometry of Ocean Climate (ATOC) project. These time series are compared with other available data types. The acoustic time series of transmissions from the California and Kauai acoustic sources were obtained during 1996–1999. As a result of marine mammal protocols

Brian D. Dushaw; ATOC Group

2000-01-01T23:59:59.000Z

406

Method and apparatus for sizing and separating warp yarns using acoustical energy  

DOE Patents (OSTI)

A slashing process is disclosed for preparing warp yarns for weaving operations including the steps of sizing and/or desizing the yarns in an acoustic resonance box and separating the yarns with a leasing apparatus comprised of a set of acoustically agitated lease rods. The sizing step includes immersing the yarns in a size solution contained in an acoustic resonance box. Acoustic transducers are positioned against the exterior of the box for generating an acoustic pressure field within the size solution. Ultrasonic waves that result from the acoustic pressure field continuously agitate the size solution to effect greater mixing and more uniform application and penetration of the size onto the yarns. The sized yarns are then separated by passing the warp yarns over and under lease rods. Electroacoustic transducers generate acoustic waves along the longitudinal axis of the lease rods, creating a shearing motion on the surface of the rods for splitting the yarns. 2 figs.

Sheen, S.H.; Chien, H.T.; Raptis, A.C.; Kupperman, D.S.

1998-05-19T23:59:59.000Z

407

The Energy Transformation Limit Theorem for Gas Flow Systems  

E-Print Network (OSTI)

The limit energy theorem which determines the possibility of transformation the energy flow in power systems in the absence of technical work is investigated and proved for such systems as gas lasers and plasmatrons, chemical gas reactors, vortex tubes, gas-acoustic and other systems, as well as a system of close stars. In the case of the same name ideal gas in the system the maximum ratio of energy conversion effectiveness is linked to the Carnot theorem, which in its turn is connected with the Nernst theorem. However, numerical analyses show that the class of flow energy systems is non-carnot one. The ratio of energy conversion effectiveness depends on the properties of the working medium; a conventional cycle in open-circuit is essentially irreversible. The proved theorem gives a more strongly worded II law of thermodynamics for the selected class of flow energy systems. Implications for astrophysical thermodynamic systems and the theory of a strong shock wave are discussed.

Volov, V T

2011-01-01T23:59:59.000Z

408

Residual Seminal Vesicle Displacement in Marker-Based Image-Guided Radiotherapy for Prostate Cancer and the Impact on Margin Design  

Science Conference Proceedings (OSTI)

Purpose: The objectives of this study were to quantify residual interfraction displacement of seminal vesicles (SV) and investigate the efficacy of rotation correction on SV displacement in marker-based prostate image-guided radiotherapy (IGRT). We also determined the effect of marker registration on the measured SV displacement and its impact on margin design. Methods and Materials: SV displacement was determined relative to marker registration by using 296 cone beam computed tomography scans of 13 prostate cancer patients with implanted markers. SV were individually registered in the transverse plane, based on gray-value information. The target registration error (TRE) for the SV due to marker registration inaccuracies was estimated. Correlations between prostate gland rotations and SV displacement and between individual SV displacements were determined. Results: The SV registration success rate was 99%. Displacement amounts of both SVs were comparable. Systematic and random residual SV displacements were 1.6 mm and 2.0 mm in the left-right direction, respectively, and 2.8 mm and 3.1 mm in the anteroposterior (AP) direction, respectively. Rotation correction did not reduce residual SV displacement. Prostate gland rotation around the left-right axis correlated with SV AP displacement (R{sup 2} = 42%); a correlation existed between both SVs for AP displacement (R{sup 2} = 62%); considerable correlation existed between random errors of SV displacement and TRE (R{sup 2} = 34%). Conclusions: Considerable residual SV displacement exists in marker-based IGRT. Rotation correction barely reduced SV displacement, rather, a larger SV displacement was shown relative to the prostate gland that was not captured by the marker position. Marker registration error partly explains SV displacement when correcting for rotations. Correcting for rotations, therefore, is not advisable when SV are part of the target volume. Margin design for SVs should take these uncertainties into account.

Smitsmans, Monique H.P.; Bois, Josien de; Sonke, Jan-Jakob [Department of Radiation Oncology, Netherlands Cancer Institute-Antoni van Leeuwenhoek Hospital, Amsterdam (Netherlands); Catton, Charles N. [Radiation Medicine Program, Princess Margaret Hospital, Ontario Cancer Institute, Department of Radiation Oncology, Toronto (Canada); Jaffray, David A. [Radiation Medicine Program, Princess Margaret Hospital, Ontario Cancer Institute, Department of Radiation Physics, Toronto (Canada); Lebesque, Joos V. [Department of Radiation Oncology, Netherlands Cancer Institute-Antoni van Leeuwenhoek Hospital, Amsterdam (Netherlands); Herk, Marcel van, E-mail: portal@nki.n [Department of Radiation Oncology, Netherlands Cancer Institute-Antoni van Leeuwenhoek Hospital, Amsterdam (Netherlands)

2011-06-01T23:59:59.000Z

409

flow_measurements_cryogenic  

Science Conference Proceedings (OSTI)

... A dynamic weighing system is used to measure ... using liquid nitrogen at flow rates of 1 ... For volumetric flow rate measurement, the uncertainty in fluid ...

2013-06-17T23:59:59.000Z

410

Multiphase flow calculation software  

DOE Patents (OSTI)

Multiphase flow calculation software and computer-readable media carrying computer executable instructions for calculating liquid and gas phase mass flow rates of high void fraction multiphase flows. The multiphase flow calculation software employs various given, or experimentally determined, parameters in conjunction with a plurality of pressure differentials of a multiphase flow, preferably supplied by a differential pressure flowmeter or the like, to determine liquid and gas phase mass flow rates of the high void fraction multiphase flows. Embodiments of the multiphase flow calculation software are suitable for use in a variety of applications, including real-time management and control of an object system.

Fincke, James R. (Idaho Falls, ID)

2003-04-15T23:59:59.000Z

411

Multiphase Flow Modeling Research  

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

Science Chris Guenther, Director Computational Science Division RUA Spring Meeting, Morgantown, WV March 2013 2 NETL's Multiphase Flow Science Team * The Multiphase Flow Science...

412

A New Scheme for Effective Roughness Length and Effective Zero-Plane Displacement in Land Surface Models  

Science Conference Proceedings (OSTI)

Based on the similarity theory of the atmospheric surface layer and the flux conservation and mass conservation laws, a new scheme for determining the effective roughness length (ERL) and the effective zero-plane displacement (EZPD) for a ...

Zhong Zhong; Wei Lu; Shuai Song; Yaocun Zhang

2011-12-01T23:59:59.000Z

413

Energy and first costs analysis of displacement and mixing ventilation systems for U.S. buildings and climates  

E-Print Network (OSTI)

In the past two decades, displacement ventilation has been increasingly used in Scandinavia and Western Europe to improve indoor air quality and to save energy. By using a detailed computer simulation method, this study ...

Hu, ShiPing, 1970-

1999-01-01T23:59:59.000Z

414

Water Vapor Structure Displacements from Cloud-Free Meteosat Scenes and Their Interpretation for the Wind Field  

Science Conference Proceedings (OSTI)

The evaluation of water vapor (WV) images taken by satellite-borne radiometers has become an essential source of data in modern meteorology. The analysis of structure displacements within sections of WV images is an effective way to get ...

G. Büche; H. Karbstein; A. Kummer; H. Fischer

2006-04-01T23:59:59.000Z

415

Wettability and Oil Recovery by Imbibition and Viscous Displacement from Fractured and Heterogeneous Carbonates  

Science Conference Proceedings (OSTI)

About one-half of U.S. oil reserves are held in carbonate formations. The remaining oil in carbonate reservoirs is regarded as the major domestic target for improved oil recovery. Carbonate reservoirs are often fractured and have great complexity even at the core scale. Formation evaluation and prediction is often subject to great uncertainty. This study addresses quantification of crude oil/brine/rock interactions and the impact of reservoir heterogeneity on oil recovery by spontaneous imbibition and viscous displacement from pore to field scale. Wettability-alteration characteristics of crude oils were measured at calcite and dolomite surfaces and related to the properties of the crude oils through asphaltene content, acid and base numbers, and refractive index. Oil recovery was investigated for a selection of limestones and dolomites that cover over three orders of magnitude in permeability and a factor of four variation in porosity. Wettability control was achieved by adsorption from crude oils obtained from producing carbonate reservoirs. The induced wettability states were compared with those measured for reservoir cores. The prepared cores were used to investigate oil recovery by spontaneous imbibition and viscous displacement. The results of imbibition tests were used in wettability characterization and to develop mass transfer functions for application in reservoir simulation of fractured carbonates. Studies of viscous displacement in carbonates focused on the unexpected but repeatedly observed sensitivity of oil recovery to injection rate. The main variables were pore structure, mobility ratio, and wettability. The potential for improved oil recovery from rate-sensitive carbonate reservoirs by increased injection pressure, increased injectivity, decreased well spacing or reduction of interfacial tension was evaluated.

Norman R. Morrow; Jill Buckley

2006-04-01T23:59:59.000Z

416

Update of distillers grains displacement ratios for corn ethanol life-cycle analysis.  

DOE Green Energy (OSTI)

Production of corn-based ethanol (either by wet milling or by dry milling) yields the following coproducts: distillers grains with solubles (DGS), corn gluten meal (CGM), corn gluten feed (CGF), and corn oil. Of these coproducts, all except corn oil can replace conventional animal feeds, such as corn, soybean meal, and urea. Displacement ratios of corn-ethanol coproducts including DGS, CGM, and CGF were last updated in 1998 at a workshop at Argonne National Laboratory on the basis of input from a group of experts on animal feeds, including Prof. Klopfenstein (University of Nebraska, Lincoln), Prof. Berger (University of Illinois, Urbana-Champaign), Mr. Madson (Rapheal Katzen International Associates, Inc.), and Prof. Trenkle (Iowa State University) (Wang 1999). Table 1 presents current dry milling coproduct displacement ratios being used in the GREET model. The current effort focuses on updating displacement ratios of dry milling corn-ethanol coproducts used in the animal feed industry. Because of the increased availability and use of these coproducts as animal feeds, more information is available on how these coproducts replace conventional animal feeds. To glean this information, it is also important to understand how industry selects feed. Because of the wide variety of available feeds, animal nutritionists use commercial software (such as Brill Formulation{trademark}) for feed formulation. The software recommends feed for the animal on the basis of the nutritional characteristics, availability, and price of various animal feeds, as well as on the nutritional requirements of the animal (Corn Refiners Association 2006). Therefore, feed formulation considers both the economic and the nutritional characteristics of feed products.

Arora, S.; Wu, M.; Wang, M.; Energy Systems

2011-02-01T23:59:59.000Z

417

Modeling and Validation of Performance Limitations for the Optimal Design of Interferometric and Intensity-Modulated Fiber Optic Displacement Sensors  

Science Conference Proceedings (OSTI)

Optical fiber sensors offer advantages over traditional electromechanical sensors, making them particularly well-suited for certain measurement applications. Generally speaking, optical fiber sensors respond to a desired measurand through modulation of an optical signal's intensity, phase, or wavelength. Practically, non-contacting fiber optic displacement sensors are limited to intensity-modulated and interferometric (or phase-modulated) methodologies. Intensity-modulated fiber optic displacement sensors relate target displacement to a power measurement. The simplest intensity-modulated sensor architectures are not robust to environmental and hardware fluctuations, since such variability may cause changes in the measured power level that falsely indicate target displacement. Differential intensity-modulated sensors have been implemented, offering robustness to such intensity fluctuations, and the speed of these sensors is limited only by the combined speed of the photodetection hardware and the data acquisition system (kHz-MHz). The primary disadvantages of intensity-modulated sensing are the relatively low accuracy (?m-mm for low-power sensors) and the lack of robustness, which consequently must be designed, often with great difficulty, into the sensor's architecture. White light interferometric displacement sensors, on the other hand, offer increased accuracy and robustness. Unlike their monochromatic-interferometer counterparts, white light interferometric sensors offer absolute, unambiguous displacement measurements over large displacement ranges (cm for low-power, 5 mW, sources), necessitating no initial calibration, and requiring no environmental or feedback control. The primary disadvantage of white light interferometric displacement sensors is that their utility in dynamic testing scenarios is limited, both by hardware bandwidth and by their inherent high-sensitivity to Doppler-effects. The decision of whether to use either an intensity-modulated interferometric sensor depends on an appropriate performance function (e.g., desired displacement range, accuracy, robustness, etc.). In this dissertation, the performance limitations of a bundled differential intensity-modulated displacement sensor are analyzed, where the bundling configuration has been designed to optimize performance. The performance limitations of a white light Fabry-Perot displacement sensor are also analyzed. Both these sensors are non-contacting, but they have access to different regions of the performance-space. Further, both these sensors have different degrees of sensitivity to experimental uncertainty. Made in conjunction with careful analysis, the decision of which sensor to deploy need not be an uninformed one.

Moro, Erik A. [Los Alamos National Laboratory

2012-06-07T23:59:59.000Z

418

Review of air flow measurement techniques  

SciTech Connect

Airflow measurement techniques are necessary to determine the most basic of indoor air quality questions: ''Is there enough fresh air to provide a healthy environment for the occupants of the building?'' This paper outlines airflow measurement techniques, but it does not make recommendations for techniques that should be used. The airflows that will be discussed are those within a room or zone, those between rooms or zones, such as through doorways (open or closed) or passive vents, those between the building and outdoors, and those through mechanical air distribution systems. Techniques that are highlighted include particle streak velocimetry, hot wire anemometry, fan pressurization (measuring flow at a given pressure), tracer gas, acoustic methods for leak size determination, the Delta Q test to determine duct leakage flows, and flow hood measurements. Because tracer gas techniques are widely used to measure airflow, this topic is broken down into sections as follows: decay, pulse injection, constant injection, constant concentration, passive sampling, and single and multiple gas measurements for multiple zones.

McWilliams, Jennifer

2002-12-01T23:59:59.000Z

419

Hydraulophone design considerations: absement, displacement, and velocity-sensitive music keyboard in which each key is a water jet  

Science Conference Proceedings (OSTI)

We present a musical keyboard that is not only velocity-sensitive, but in fact responds to absement (presement), displacement (placement), velocity, acceleration, jerk, jounce, etc. (i.e. to all the derivatives, as well as the integral, of displacement).Moreover, ... Keywords: FUNtain, direct user interface, duringtouch, fluid-user-interface, haptic surface, harmelodica, harmelotron (harmellotron), hydraulic-action, hydraulophone, pneumatophone, tangible user interface, tracker-action, underwater musical instrument, water-based immersive multimedia

Steve Mann; Ryan Janzen; Mark Post

2006-10-01T23:59:59.000Z

420

Development of a digital control unit to displace diesel fuel with natural gas  

DOE Green Energy (OSTI)

Full Circle Engineering (FCE), supported by the Colorado School of Mines (CSM), proposed a Small Business CRADA with Allied Signal Federal Manufacturing & Technologies/Kansas City (FM&T/KC) for the development of a fumigation digital control unit (DCU) that would allow the displacement of diesel fuel with natural gas. Nationwide, diesel trucks and buses consumed over 21 billion gallons of fuel in 1992. The development of systems that allow the use of alternative fuels, natural gas in particular, for transportation would significantly reduce emissions and pollutants. It would also help implement DOE`s mandate for energy security (use of domestic fuels) required by the Energy Policy Act (EPACT).

Talbott, A.D. [AlliedSignal FM& T, Kansas City, MO (United States)]|[Full Circle Engineering, Northglenn, CO (United States)

1997-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "acoustics displacement flow" 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

Computer-assisted tomography for the observation of oil displacement in porous media  

SciTech Connect

Computer-assisted tomography (CAT) is used to obtain cross-sectional images of Berea sandstone cores during oil displacement experiments. Local oil saturation averaged over an area of about 0.03X0.03 in. (0.8X0.8 mm) square is computed as a function of spatial position and time. A series of CAT scan images displaying the time evolution of the fluid distribution at one cross section are shown to illustrate the formation of viscous fingers.

Wang, S.Y.; Ayral, S.; Gryte, C.C.

1984-02-01T23:59:59.000Z

422

Transient foam flow in porous media with CAT Scanner  

SciTech Connect

Transient behavior is likely to dominate over most of the duration of a foam injection field project. Due to the lack of date, little is presently known about transient foam flow behavior. Foam flow does not follow established models such as the Buckley-Leverett theory, and no general predictive model has been derived. Therefore, both experimental data and a foam flow theory are needed. In this work, foam was injected at a constant mass rate into one-dimensional sandpacks of 1-in diameter and 24-in or 48-in length that had initially been saturate with distilled water. The system was placed in a cat Scanner. Data, obtained at room temperature and low pressure at various times, include both the pressure and saturation distributions. Pressure profiles showed that the pressure gradient is much greater behind the foam front than ahead of it. Moreover, the pressure gradients keep changing as the foam advances in the sandpack. This behavior differs from Buckley-Leverett theory. The CT scan results demonstrated gas channeling near the front, but eventually the foam block all these channels and sweeps the entire cross section after many pore volumes of injection. Three series of experiments were run: (1) surfactant adsorption measurements; (2) gas displacements of surfactant-laden solutions and (3) foam displacements. The first two series of experiments were made to provide the necessary parameters required to match the foam displacements. To this end, it was necessary to smooth the saturation history data, using a Langmuir-type formula. A theory was proposed based on the principles of the fractional flow curve construction method. This foam theory treats the foam as composed of infinitesimal slugs of gas of varying viscosities. The foam front has the lowest viscosity and foam at the injection end has the highest.

Liu, Dianbin; Brigham, W.E.

1992-03-01T23:59:59.000Z

423

Opto-acoustic recanilization delivery system  

DOE Patents (OSTI)

Fiber delivered laser pulses emulsify thrombus by mechanical stresses that include a combination of pressure, tension and shear stress. Laser radiation is delivered to the locality of a thrombus and the radiation is absorbed by blood, blood dot, or other present materials. The combination of a leading pressure wave and subsequent vapor bubble cause efficient, emulsification of thrombus. Operating the laser in a low average power mode alleviates potential thermal complications. The laser is operated in a high repetition rate mode to take advantage of ultrasound frequency effects of thrombus dissolution as well as to decrease the total procedure time. Specific parameter ranges for operation are described. The device includes optical fibers surrounding a lumen intended for flow of a cooling agent. The fibers may be arranged concentrically around the lumen to deliver radiation and heat over as large an area as possible. An alternative design approach incorporates the optical fibers into the wall of the guiding catheter and utilizes the catheter lumen as the cooling channel. An eccentric tip enables rotation of the device to address all parts of the vasculature. The eccentricity can be provided via a variety of means: spring dip, balloon, protrusion, etc.

Visuri, Steven R. (Livermore, CA); Da Silva, Luiz B. (Danville, CA); Celliers, Peter M. (Berkeley, CA); London, Richard A. (Orinda, CA); Benett, William (Livermore, CA); Broughton, Kathryn (Berkeley, CA); Esch, Victor (San Francisco, CA)

2002-01-01T23:59:59.000Z

424

Acoustic Doppler Current Profiler Measurements in the Tailrace at John Day Dam  

DOE Green Energy (OSTI)

Acoustic Doppler current profilers (ADCPs) were used to measure water velocities in the tailrace at John Day Dam over a two-week period in February 2005. Data were collected by the Pacific Northwest National Laboratory for the Hydraulic Design Section, Portland District, U.S. Army Corps of Engineers (USACE). The objective of this project was therefore to collect field measurements of water velocities in the near-field draft tube exit zone as well as the far-field tailrace to be used for improving these models. Field data were collected during the project using five separate ADCPs. Mobile ADCP data were collected using two ADCPs mounted on two separate boats. Data were collected by either holding the boat on-station at pre-defined locations for approximately 10 minutes or in moving transect mode when the boat would move over large distances during the data collection. Results from the mobile ADCP survey indicated a complex hydrodynamic flow field in the tailrace downstream of John Day Dam. A large gyre was noted between the skeleton section of the powerhouse and non-spilling portion of the spillway. Downstream of the spillway, the spillway flow is constrained against the navigation lock guide wall, and large velocities were noted in this region. Downstream of the guide wall, velocities decreased as the spillway jet dispersed. Near the tailrace island, the flow split was measured to be approximately equal on Day 2 (25.4 kcfs spillway/123 kcfs total). However, approximately 60% of the flow passed along the south shore of the island on Day 1 (15.0 kcfs spillway/150 kcfs total). At a distance of 9000 ft downstream of the dam, flows had equalized laterally and were generally uniform over the cross section. The collection of water velocities near the draft tube exit of an operating turbine unit is not routine, and equipment capable of measuring 3D water velocities in these zones are at the forefront of hydraulic measurement technology. Although the feasibility of measuring 1D water velocity magnitudes has been previously demonstrated by the authors, the feasibility of resolving 3D water velocity vectors given the heterogeneity of the flow field was unknown before this study’s data were collected. Both the 1D and 3D data were collected by deploying three ADCPs on dual-axis rotators directly above the draft tube exit of Turbine Unit 16. These instruments collected 1D data during both the mobile reconnaissance campaign and a later one-week period with zero spillway discharge. During the zero spillway discharge period, Turbine Unit 16 was operated over a range of discharges. Approximately 12 hours of 1D velocity data were collected at low (12 kcfs), middle (16.2 kcfs), and high (19.2 kcfs) turbine discharges. The 1D dataset indicates large differences in flow patterns and RMS velocity fluctuations among the various discharge levels. Results from this project show that it is technically feasible to measure 3D water velocities directly downstream of an operating turbine unit using a narrow beam swath (i.e., 6-degree) ADCP. Data products from these 3D velocity data include a measurement of the draft tube barrel flow distribution (a.k.a., the flow split), directional changes and the general decay of velocity as flow exits the draft tube and enters the tailrace, and a relative measure of the homogeneity of the flow field.

Cook, Chris B.; Dibrani, Berhon; Serkowski, John A.; Richmond, Marshall C.; Titzler, P. Scott; Dennis, Gary W.

2006-01-30T23:59:59.000Z

425

Argonne CNM Highlight: Damping of acoustic vibrations in gold nanoparticles  

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

Damping of acoustic vibrations in gold nanoparticles Damping of acoustic vibrations in gold nanoparticles Nanopatterning of STO Vibrations in nanostructures offer applications in molecular-scale biological sensing and ultrasensitive mass detection. To approach single-atom sensing, it is necessary to reduce the dimensions of the structures to the nanometer scale while preserving long-lived vibrations. This requires an understanding of how vibrations in nanoscale objects are damped - or lose their energy to the fluid surroundings and within themselves. Researchers have used fast laser pulses to produce and probe high-frequency vibrations in metal nanoparticles. However, significant variations in particle dimensions complicate measurements. By studying bipyramid-shaped gold nanoparticles with highly uniform sizes

426

Acoustic Logs At Raft River Geothermal Area (1979) | Open Energy  

Open Energy Info (EERE)

Raft River Geothermal Area (1979) Raft River Geothermal Area (1979) Exploration Activity Details Location Raft River Geothermal Area Exploration Technique Acoustic Logs Activity Date 1979 Usefulness useful DOE-funding Unknown Exploration Basis To permit the lateral and vertical extrapolation of core and test data and bridged the gap between surface geophysical data and core analyses. Notes Televiewer logs permitted the location and orientation of numerous fractures and several features that may be faults. References Keys, W. S.; Sullivan, J. K. (1 June 1979) Role of borehole geophysics in defining the physical characteristics of the Raft River geothermal reservoir, Idaho Retrieved from "http://en.openei.org/w/index.php?title=Acoustic_Logs_At_Raft_River_Geothermal_Area_(1979)&oldid=473816"

427

Acoustic analogs of two-dimensional black holes  

E-Print Network (OSTI)

We present a general method for constructing acoustic analogs of the black hole solutions of two-dimensional (2D) dilaton gravity. Because by dimensional reduction every spherically symmetric, four-dimensional (4D) black hole admits a 2D description, the method can be also used to construct analogue models of 4D black holes. We also show that after fixing the gauge degrees of freedom the 2D gravitational dynamics is equivalent to an one-dimensional fluid dynamics. This enables us to find a natural definition of mass $M$, temperature $T$ and entropy $S$ of the acoustic black hole. In particular the first principle of thermodynamics $dM=TdS$ becomes a consequence of the fluid dynamics equations. We also discuss the general solutions of the fluid dynamics and two particular cases, the 2D Anti-de sitter black hole and the 4D Schwarzschild black hole.

Mariano Cadoni

2004-10-28T23:59:59.000Z

428

Underwater acoustic navigation with the WHOI micro-modem  

E-Print Network (OSTI)

Abstract — The WHOI Micro-Modem is a compact, low-power acoustic transceiver that can provide both acoustic telemetry and navigation. Its size and versatility make it ideal for integration in autonomous underwater vehicles (AUVs). The modem supports the use of both broadband and narrowband transponders for long baseline navigation systems, has a modem-to-modem ranging capability, and can be configured to provide synchronous oneway ranging, when integrated with a precision clock. This paper gives an overview of the different navigation systems supported by the Micromodem and presents the results from field tests conducted on the SeaBED AUV in deployments in Greece, the Bluefin AUV, and whale localizations in the Stellwagen Bank Marine Sanctuary. I.

Ipa Singh; Matthew Grund; Brian Bingham; Ryan Eustice; Hanumant Singh; Lee Freitag

2006-01-01T23:59:59.000Z

429

Acoustic Solitary Waves and Sagdeev Potential Triple Roots  

Science Conference Proceedings (OSTI)

Both KdV theory and the standard pseudopotential theory require that solitons and double layers be explicitly super-acoustic, with the pseudopotential {psi}({phi},M) having a maximum at the origin. Recent studies of a variety of different three-component plasmas have shown that they may support finite amplitude solitons at the true acoustic speed of the plasma configuration, M{sub s}. These are associated with triple roots of the Sagdeev potential, and the usual soliton condition is replaced by {psi}''(0,M){<=}0. Sagdeev potentials for speeds marginally greater than M{sub s} then represent solitons of both polarities, one whose amplitude vanishes at M{sub s}(KdV-like), while the other is necessarily finite at M{sub s}('nonKdV-like'). Such coexistence regions have been observed to be linked to a critical plasma compositional parameter value for which {psi}'''(0,M{sub s}) = 0.

Hellberg, M. A. [University of KwaZulu-Natal, Durban, 4001 (South Africa); Baluku, T. K. [University of KwaZulu-Natal, Durban (South Africa) and Mbarara University of Science and Technology, Mbarara (Uganda); Verheest, F. [Universiteit Gent, B-9000 Gent, Belgium, and University of KwaZulu-Natal, Durban (South Africa)

2010-12-14T23:59:59.000Z

430

Single crystal metal wedges for surface acoustic wave propagation  

DOE Patents (OSTI)

An ultrasonic testing device has been developed to evaluate flaws and inhomogeneities in the near-surface region of a test material. A metal single crystal wedge is used to generate high frequency Rayleigh surface waves in the test material surface by conversion of a slow velocity, bulk acoustic mode in the wedge into a Rayleigh wave at the metal-wedge test material interface. Particular classes of metals have been found to provide the bulk acoustic modes necessary for production of a surface wave with extremely high frequency and angular collimation. The high frequency allows flaws and inhomogeneities to be examined with greater resolution. The high degree of angular collimation for the outgoing ultrasonic beam permits precision angular location of flaws and inhomogeneities in the test material surface.

Fisher, E.S.

1980-05-09T23:59:59.000Z

431

Single crystal metal wedges for surface acoustic wave propagation  

DOE Patents (OSTI)

An ultrasonic testing device has been developed to evaluate flaws and inhomogeneities in the near-surface region of a test material. A metal single crystal wedge is used to generate high frequency Rayleigh surface waves in the test material surface by conversion of a slow velocity, bulk acoustic mode in the wedge into a Rayleigh wave at the metal-wedge test material interface. Particular classes of metals have been found to provide the bulk acoustic modes necessary for production of a surface wave with extremely high frequency and angular collimation. The high frequency allows flaws and inhomogeneities to be examined with greater resolution. The high degree of angular collimation for the outgoing ultrasonic beam permits precision angular location of flaws and inhomogeneities in the test material surface.

Fisher, Edward S. (Wheaton, IL)

1982-01-01T23:59:59.000Z

432

Development of an acoustic sensor for a geothermal borehole televiewer  

DOE Green Energy (OSTI)

The objective of this project is to upgrade acoustic sensor technology such that appropriate well logging instruments can be made to operate under the hostile environment conditions anticipated in geothermal resource exploration and evaluation. The Borehole Televiewer (BHTV) was selected as the vehicle for this sensor improvement work, primarily because of its demonstrated ability to detect and characterize fractures under sub-geothermal conditions. The work done toward providing an improved sensor for the televiewer is described. An experimental sensor concept was devised, incorporating a thin metal acoustic window, an improved, high-temperature internal coupling fluid, and thermally resistant sensor internals. During an autoclave test, it was successfully demonstrated that the resulting experimental sensor design concept provides the basic target detection and characterization functions required of a fracture mapping, Borehole Televiewer under simulated geothermal conditions. In particular, the experimental sensor remained operational at 275/sup 0/C and 7000 psi.

Wonn, J.W.

1979-03-01T23:59:59.000Z

433

Development of an acoustic sensor for a geothermal Borehole Televiewer  

DOE Green Energy (OSTI)

The objective of this project is to upgrade acoustic sensor technology such that appropriate well logging instruments can be made to operate under the hostile environment conditions anticipated in geothermal resource exploration and evaluation. The Borehole Televiewer (BHTV) was selected as the vehicle for this sensor improvement work, primarily because of its demonstrated ability to detect and characterize fractures under sub-geothermal conditions. The work done toward providing an improved sensor for the televiewer is described. An experimental sensor concept was devised, incorporating a thin metal acoustic window, an improved, high-temperature internal coupling fluid, and thermally resistant sensor internals. During an autoclave test, it was successfully demonstrated that the resulting experimental sensor design concept provides the basic target detection and characterization functions required of a fracture mapping, Borehole Televiewer under simulated geothermal conditions. In particular, the experimental sensor remained operational at 275/sup 0/C and 7000 psi.

Wonn, J.W.

1979-03-01T23:59:59.000Z

434

Challenges for Efficient Communication in Underwater Acoustic Sensor Networks  

E-Print Network (OSTI)

Abstract — Ocean bottom sensor nodes can be used for oceanographic data collection, pollution monitoring, offshore exploration and tactical surveillance applications. Moreover, Unmanned or Autonomous Underwater Vehicles (UUVs, AUVs), equipped with sensors, will find application in exploration of natural undersea resources and gathering of scientific data in collaborative monitoring missions. Underwater acoustic networking is the enabling technology for these applications. Underwater Networks consist of a variable number of sensors and vehicles that are deployed to perform collaborative monitoring tasks over a given area. In this paper, several fundamental key aspects of underwater acoustic communications are investigated. Different architectures for two-dimensional and three-dimensional underwater sensor networks are discussed, and the underwater channel is characterized. The main challenges for the development of efficient networking solutions posed by the underwater environment are detailed at all layers of the protocol stack. Furthermore, open research issues are discussed and possible solution approaches are outlined. I.

Ian F. Akyildiz; Dario Pompili; Tommaso Melodia

2004-01-01T23:59:59.000Z

435

Mechanical and acoustic properties of weakly cemented granular rocks  

SciTech Connect

This paper presents the results of laboratory measurements on the mechanical and acoustic properties of weakly cemented granular rock. Artificial rock samples were fabricated by cementing sand and glass beads with sodium silicate binder. During uniaxial compression tests, the rock samples showed stress-strain behavior which was more similar to that of soils than competent rocks, exhibiting large permanent deformations with frictional slip. The mechanical behavior of the samples approached that of competent rocks as the amount of binder was increased. For very weak samples, acoustic waves propagating in these rocks showed very low velocities of less than 1000 m/sec for compressional waves. A borehole made within this weakly cemented rock exhibited a unique mode of failure that is called ''anti-KI mode fracture'' in this paper. The effect of cementation, grain type, and boundary conditions on this mode of failure was also examined experimentally.

Nakagawa, S.; Myer, L.R.

2001-05-09T23:59:59.000Z

436

Langasite Surface Acoustic Wave Sensors: Fabrication and Testing  

SciTech Connect

We report on the development of harsh-environment surface acoustic wave sensors for wired and wireless operation. Surface acoustic wave devices with an interdigitated transducer emitter and multiple reflectors were fabricated on langasite substrates. Both wired and wireless temperature sensing was demonstrated using radar-mode (pulse) detection. Temperature resolution of better than ±0.5°C was achieved between 200°C and 600°C. Oxygen sensing was achieved by depositing a layer of ZnO on the propagation path. Although the ZnO layer caused additional attenuation of the surface wave, oxygen sensing was accomplished at temperatures up to 700°C. The results indicate that langasite SAW devices are a potential solution for harsh-environment gas and temperature sensing.

Zheng, Peng; Greve, David W.; Oppenheim, Irving J.; Chin, Tao-Lun; Malone, Vanessa

2012-02-01T23:59:59.000Z

437

Performance of a quantum key distribution protocol with dual-rail displaced photon states  

Science Conference Proceedings (OSTI)

We propose a scheme for a quantum key distribution (QKD) protocol with dual-rail displaced photon states. Displaced single-photon states with different amplitudes carry bit values of code that may be extracted, while coherent states carry nothing and only provide an inconclusive outcome. A real resource of single photons is used, involving imperfections associated with experimental technique that result in a photon state with an admixture of the vacuum state. The protocol is robust against the loss of a single photon and the inefficiency of the detectors. Pulses with large amplitudes, unlike the conventional QKD relying on faint laser pulses, are used that may approximate it to standard telecommunication and may show resistance to eaves-dropping even in settings with high attenuation. Information leakage to the eavesdropper is determined from comparison of the output distributions of the outcomes with ideal ones that are defined by two additional parameters accessible to only those send the pulses. Robustness to some possible eavesdropping attacks is shown.

Podoshvedov, S. A., E-mail: sap@kias.re.k [Korea Institute for Advanced Study, School of Computational Sciences (Korea, Republic of)

2010-04-15T23:59:59.000Z

438

Portable wastewater flow meter  

DOE Patents (OSTI)

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

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

1999-02-02T23:59:59.000Z

439

Portable wastewater flow meter  

DOE Patents (OSTI)

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

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

1990-01-01T23:59:59.000Z

440

Computer program for conducting acoustical analyses of HVAC systems.  

Science Conference Proceedings (OSTI)

An interactive Windows?based computer program has been developed that can be used to conduct complete acoustical analyses of HVAC systems. The program can be used to track sound from a HVACsound source such as a fan to a room. Both sound from a single path between a sound source and room or from multiple paths between a sound source and room can be investigated. The program has a full set of editing features that include change

Douglas D. Reynolds; Scott C. Mitchell

1996-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "acoustics displacement flow" 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

Adiabatic trapping in coupled kinetic Alfven-acoustic waves  

SciTech Connect

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

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

2013-03-15T23:59:59.000Z

442

Surface acoustic wave probe implant for predicting epileptic seizures  

DOE Patents (OSTI)

A system and method for predicting and avoiding a seizure in a patient. The system and method includes use of an implanted surface acoustic wave probe and coupled RF antenna to monitor temperature of the patient's brain, critical changes in the temperature characteristic of a precursor to the seizure. The system can activate an implanted cooling unit which can avoid or minimize a seizure in the patient.

Gopalsami, Nachappa (Naperville, IL); Kulikov, Stanislav (Sarov, RU); Osorio, Ivan (Leawood, KS); Raptis, Apostolos C. (Downers Grove, IL)

2012-04-24T23:59:59.000Z

443

Dust acoustic shock waves in two temperatures charged dusty grains  

Science Conference Proceedings (OSTI)

The reductive perturbation method has been used to derive the Korteweg-de Vries-Burger equation and modified Korteweg-de Vries-Burger for dust acoustic shock waves in a homogeneous unmagnetized plasma having electrons, singly charged ions, hot and cold dust species with Boltzmann distributions for electrons and ions in the presence of the cold (hot) dust viscosity coefficients. The behavior of the shock waves in the dusty plasma has been investigated.

El-Shewy, E. K. [Theoretical Physics Group, Faculty of Science, Mansoura University, Mansoura (Egypt); Science and Arts College in Al-Rass, Physics Department, Qassim University, Al-Rass Province (Saudi Arabia); Abdelwahed, H. G. [Theoretical Physics Group, Faculty of Science, Mansoura University, Mansoura (Egypt); College of Science and Humanitarian Studies, Physics Department, Alkharj University, Al-kharj (Saudi Arabia); Elmessary, M. A. [Engineering Mathematics and Physics Department, Faculty of Engineering, Mansoura University, Mansoura (Egypt)

2011-11-15T23:59:59.000Z

444

Acoustic emission monitoring for assessment of steel bridge details  

SciTech Connect

Acoustic emission (AE) testing was deployed on details of two large steel Interstate Highway bridges: one cantilever through-truss and one trapezoidal box girder bridge. Quantitative measurements of activity levels at known and suspected crack locations were made by monitoring AE under normal service loads (e.g., live traffic and wind). AE indications were used to direct application of radiography, resulting in identification of a previously unknown flaw, and to inform selection of a retrofit detail.

Kosnik, D. E.; Corr, D. J. [Infrastructure Technology Institute, Northwestern University, Evanston, IL 60208 (United States); Hopwood, T. [Kentucky Transportation Center, University of Kentucky, Lexington, KY 40506 (United States)

2011-06-23T23:59:59.000Z

445

Design Parameters of a Miniaturized Piezoelectric Underwater Acoustic Transmitter  

Science Conference Proceedings (OSTI)

The Juvenile Salmon Acoustic Telemetry System (JSATS) project supported by the U.S. Army Corps of Engineers, Portland District, has yielded the smallest acoustic fish tag transmitter commercially available to date. In order to study even smaller fish populations and make the transmitter injectable by needles, the JSATS acoustic micro transmitter needs to be further downsized. As part of the transmitter downsizing effort some of the design parameters of the lead zirconate titanate (PZT) ceramic tube transducer in the transmitter were studied, including the type of PZT, the backing material, the necessary drive voltage, the transmitting bandwidth and the length of the transducer. It was found that, to satisfy the 156-dB source level requirement of JSATS, a square wave with a 10-volt amplitude is required to drive 'soft' PZT transducers. PZT-5H demonstrated the best source level performance. For Navy types I and II, 16 volts or 18 volts were needed. Ethylene-propylene-diene monomer (EPDM) closed-cell foam was found to be the backing material providing the highest source level. The effect of tube length on the source level is also demonstrated in this paper, providing quantitative information for downsizing of small piezoelectric transmitters.

Li, Huidong; Deng, Zhiqun; Yuan, Yong; Carlson, Thomas J.

2012-07-02T23:59:59.000Z

446

Constraint condition on transformed relation for generalized acoustics  

E-Print Network (OSTI)

Contrary to transformation optics (TO), there exist many possibilities for transformed relations of material property and field variable in case of transformation acoustics (TA). To investigate the underlining mechanism and develop a general method that can obtain the full transformed relations, an alternative interpretation to the form-invariance is explored. We consider a spatial transformation, with which a physical phenomenon described in an initial space is transformed to a deformed space, and interpret the mapping by local affine transformation point-by-point. Further, we postulate that the transformed material property and field must rebuild the same physical process, and that the energy must be conserved at each point during the transformation. These conditions impose the constraint on the transformed relation for material property and field. By establishing two local Cartesian frames defined uniquely by the spatial transformation, any physical quantity is shown to first experience a rigid rotation and then a stretch operation during the transformation. We show that the constraint conditions are not enough to determine completely the transformed relation for TA, leaving a possibility to define them differently as found in the literature. New acoustic transformations with constant density or modulus are also proposed and verified by constructing a two-dimensional acoustic cloak. Finally, we show that the transformed relation is uniquely determined for transformation optics, and discuss how this method can be extended to other transformation physics.

Jin Hu; Xiaoning Liu; Gengkai Hu

2009-12-30T23:59:59.000Z

447

Fluid flow analysis in a rough fracture (type II) using complex networks and lattice Boltzmann method  

E-Print Network (OSTI)

Complexity of fluid flow in a rough fracture is induced by the complex configurations of opening areas between the fracture planes. In this study, we model fluid flow in an evolvable real rock joint structure, which under certain normal load is sheared. In an experimental study, information regarding about apertures of the rock joint during consecutive 20 mm displacements and fluid flow (permeability) in different pressure heads have been recorded by a scanner laser. Our aim in this study is to simulate the fluid flow in the mentioned complex geometries using the lattice Boltzmann method (LBM), while the characteristics of the aperture field will be compared with the modeled fluid flow permeability To characterize the aperture, we use a new concept in the graph theory, namely: complex networks and motif analysis of the corresponding networks. In this approach, the similar aperture profile along the fluid flow direction is mapped in to a network space. The modeled permeability using the LBM shows good correlat...

Ghaffari, H; Sharifzadeh, M; Young, R P

2011-01-01T23:59:59.000Z

448

Resonant acoustic transducer and driver system for a well drilling string communication system  

DOE Patents (OSTI)

The acoustic data communication system includes an acoustic transmitter and receiver wherein low frequency acoustic waves, propagating in relatively loss free manner in well drilling string piping, are efficiently coupled to the drill string and propagate at levels competitive with the levels of noise generated by drilling machinery also present in the drill string. The transmitting transducer incorporates a mass-spring piezoelectric transmitter and amplifier combination that permits self-oscillating resonant operation in the desired low frequency range.

Chanson, Gary J. (Weston, MA); Nicolson, Alexander M. (Concord, MA)

1981-01-01T23:59:59.000Z

449

CFD-based application of the Nyquist criterion to thermo-acoustic instabilities  

Science Conference Proceedings (OSTI)

A novel approach for the analysis of self-excited instabilities in thermo-acoustic systems is proposed. Combining computational fluid dynamics with low-order acoustic modeling, the open-loop transfer function of the system under investigation is computed. ... Keywords: 02.30.Yy, 43.28.Kt, 43.35.Ud, 43.60.Bf, 47.50.Gj, 52.35.Dm, Computational fluid dynamics, Control theory, Instabilities, Thermo-acoustics

J. Kopitz; W. Polifke

2008-07-01T23:59:59.000Z

450

Distortion of low-frequency acoustic signals by interaction with the moving ocean surface  

E-Print Network (OSTI)

A moving upper boundary in ocean acoustics . . . . . . 1.21.3 Foundations for studying ocean surface wave in?uence onmodels . . . . . . . . . . . 1.3.2 Ocean surface wave

Lynch, Stephen Dennis

2008-01-01T23:59:59.000Z

451

Condition monitoring of internal leakage in modern water hydraulic cylinders using acoustic emission.  

E-Print Network (OSTI)

??This research aims to develop a sensitive method for condition monitoring of internal leakage in a modem water hydraulic cylinder by means of acoustic emission… (more)

Chen, Ping.

2009-01-01T23:59:59.000Z

452

Microsoft PowerPoint - In-Situ Acoustic Measurements_Skliar  

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

Bramanti, M., Tonazzini, A., Tonazzini, A., "An acoustic pyrometer system for tomographic thermal imaging in power plant boilers, " IEEE Trans. Instrumentation and Measurement,...

453

Passive Acoustic Determination of Wave-Breaking Events and Their Severity across the Spectrum  

Science Conference Proceedings (OSTI)

A passive acoustic method of detecting breaking waves of different scales has been developed. The method also showed promise for measuring breaking severity.

Richard Manasseh; Alexander V. Babanin; Cameron Forbes; Kate Rickards; Irena Bobevski; Andrew Ooi

2006-04-01T23:59:59.000Z

454

Clean Burst Rapid Acoustic Lysis for Point-of-Care Diagnostics ...  

CleanBurst System (A) five channel acoustic array that couples reversibly to user-specified nano/microfluidic devices (B). The nano/microfluidic device (B) reversibly ...

455

Acoustic Logs At The Needles Area (DOE GTP) | Open Energy Information  

Open Energy Info (EERE)

The Needles Area (DOE GTP) Exploration Activity Details Location The Needles Area Exploration Technique Acoustic Logs Activity Date Usefulness not indicated DOE-funding Unknown...

456

Design of a low-cost underwater acoustic modem for short- range sensor networks  

E-Print Network (OSTI)

of Optical Waves Underwater . . . . . . . 3.2.2 ExistingChapter 4 Existing Underwater Acoustic Modems 4.1 CommercialControl Structure of Symbol Synchronization for Underwater

Benson, Bridget

2010-01-01T23:59:59.000Z

457

Characterisation of long-range horizontal performance of underwater acoustic communication.  

E-Print Network (OSTI)

??Underwater acoustic communication is a rapidly progressing field of technology, largely due to recent advances in low cost and power efficient digital signal processors. Unfortunately,… (more)

Pusey, Grant Mark

2011-01-01T23:59:59.000Z

458

Design, implementation and performance evaluation of security services for Underwater Acoustic Networks.  

E-Print Network (OSTI)

??Underwater Acoustic Networks (UANs), composed by Autonomous Underwater Vehicles (AUVs) are part of a new network paradigm that is being proposed for different uses like… (more)

MASSANTI, GIULIANO

2011-01-01T23:59:59.000Z

459

Unsteady flow volumes  

SciTech Connect

Flow volumes are extended for use in unsteady (time-dependent) flows. The resulting unsteady flow volumes are the 3 dimensional analog of streamlines. There are few examples where methods other than particle tracing have been used to visualize time varying flows. Since particle paths can become convoluted in time there are additional considerations to be made when extending any visualization technique to unsteady flows. We will present some solutions to the problems which occur in subdivision, rendering, and system design. We will apply the unsteady flow volumes to a variety of field types including moving multi-zoned curvilinear grids.

Becker, B.G.; Lane, D.A.; Max, N.L.

1995-03-01T23:59:59.000Z

460

Improving Petroleum Displacement Potential of PHEVs Using Enhanced Charging Scenarios: Preprint  

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

5730 5730 May 2009 Improving Petroleum Displacement Potential of PHEVs Using Enhanced Charging Scenarios Preprint T. Markel, K. Smith, and A.A. Pesaran Presented at EVS-24 International Battery, Hybrid and Fuel Cell Electric Vehicle Symposium Stavanger, Norway May 13-16, 2009 NOTICE The submitted manuscript has been offered by an employee of the Alliance for Sustainable Energy, LLC (ASE), a contractor of the US Government under Contract No. DE-AC36-08-GO28308. Accordingly, the US Government and ASE retain a nonexclusive royalty-free license to publish or reproduce the published form of this contribution, or allow others to do so, for US Government purposes. This report was prepared as an account of work sponsored by an agency of the United States government.

Note: This page contains sample records for the topic "acoustics displacement flow" 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

Residential wood burning: Energy modeling and conventional fuel displacement in a national sample  

SciTech Connect

This research studied the natural, built, and behavioral factors predictive of energy consumption for residential space heating with wood or conventional fuels. This study was a secondary analysis of survey data from a nationwide representative sample of 5,682 households collected DOE in the 1984-1985 REC survey. Included were: weather, census division and utility data, interviewer-supplied dwelling measurements and respondent-reported energy-related family behaviors. Linear-regression procedures were used to develop a model that identified key determinants accounting for the variability in wood consumption. A nonlinear-regression model was employed to estimate the amount of conventional fuels used for space heating. The model was also used to estimate the amount of conventional fuels being displaced by wood-heating systems. There was a significant (p {le} .05) linear relationship between the dependent variable, square root of cords burned, various independent variables.

Warsco, K.S.

1988-01-01T23:59:59.000Z

462

Analysis of vibration and pressure pulsation in positive displacement drilling motors  

Science Conference Proceedings (OSTI)

Three, Moineau principle, positive displacement (drilling) motors were tested on a dynamometer using water, air/mist, and foam. In conjunction with a traditional motor performance test, data were collected at 5000 samples per second using an adapted seismic data acquisition system. Shaft speed, torque, pressure, and three-axis vibration data were processed using Seismic Analysis Code (SAC) to obtain energy density spectrums (EDSs). Cascade plots were generated by plotting the EDSs against shaft speed. The cascade plots revealed that pressure pulses and motor vibrations are closely related to the eccentric rotation of the rotor in the power section. Excessive no-load vibrations were not observed in the small motors and test apparatus used; increasing torque usually decreases the amplitude of vibrations observed. Motor vibration amplitudes were as a rule not increased when compressible fluids were substituted for water.

Hamlin, D.B.; Dreesen, D.S.

1998-12-31T23:59:59.000Z

463

Clip gage attachment for frictionless measurement of displacement during high-temperature mechanical testing  

DOE Patents (OSTI)

An attachment for placement between a test specimen and a remote clip gage extensometer providing improved fracture toughness tests of materials at elevated temperature is described. Using a cylindrical tube and axial rod in new relationship, the device transfers the displacement signal of the fracture toughness test specimen directly to a clip gage extensometer located outside the high temperature furnace. Virtually frictionless operation is assured by having the test specimen center one end of the rod in one end of the tube, while the clip gage extensometer arms center the other end of the rod in the other end of the tube. By providing positive control over both ends of both rod and tube, the attachment may be operated in orientations other than vertical. 1 figure.

Alexander, D.J.

1994-01-04T23:59:59.000Z

464

Micronized-coal-water slurry sprays from a diesel engine positive displacement fuel injection system  

DOE Green Energy (OSTI)

Experiments have been conducted to characterize the sprays from a modified positive displacement fuel injection system for a diesel engine. Diesel fuel water and three concentrations of micronized-coal-water slurry were used in these experiments. The injection system includes an injection jerk pump driven by an electric motor, a specially designed diaphragm to separate the abrasive coal slurry fuel from the pump, and a single-hole fuel nozzle. The sprays were injected into a pressurized chamber equipped with windows. High speed movies and still photographs of the sprays were obtained. In addition, instaneous fuel line pressures and needle lifts were obtained. Data were acquired as a function of fluid, nozzle orifice diameter, rack setting and chamber conditions. The high speed movies were used to determine spray penetration and spray growth.

Caton, J.A.; Kihm, K.D.; Seshadri, A.K.; Zicterman, G. [Texas A and M Univ., College Station, TX (United States). Dept. of Mechanical Engineering

1991-12-31T23:59:59.000Z

465

Quantitative displacement measurement of a nanotube cantilever with nanometer accuracy using epifluorescence microscopy  

SciTech Connect

A method to measure the deflection of a nanotube cantilever with nanometer accuracy in an air or liquid environment is presented. We attached fluorescent dyes at the end of a nanotube to detect its deflection. The nanotube cantilever was fabricated with a multiwalled carbon nanotube that is attached to the end of an electrochemically etched tungsten tip, and it was imaged in an epifluorescence microscope system. The fluorescence intensity distribution of the fluorescent particles at the end of the nanotube was approximated with a Gaussian and fitted by least-squares method. Finally, we were able to measure the displacement of the nanotube cantilever during electrostatic actuation with positional accuracy of a few nanometers. This technique can be applied to a manipulator or a force transducer on related a few piconewton forces.

Park, Hyojun; Kwon, Soongeun; Kim, Soohyun [Department of Mechanical Engineering, School of Mechanical, Aerospace and Systems Engineering, Korea Advanced Institute of Science and Technology (KAIST), 373-1, Guseong-dong, Yuseong-gu, Daejeon 305-701 (Korea, Republic of)

2009-05-15T23:59:59.000Z

466

Void Swelling at Low Displacement Rates in Annealed X18H10T ...  

Science Conference Proceedings (OSTI)

Aug 1, 1999 ... Using a flow restrictor component from the low-flux breeder zone of the BN-350 reactor in Kazakhstan, it was possible to examine the behavior ...

467

Stable crack growth estimates based on effective crack length and crack-opening displacements  

SciTech Connect

A method was developed for estimating the amount of stable crack growth that has occurred in a fracture toughness specimen that were loaded into the plastic range and for which only a monotonically increasing load-displacement curve was measured. The method was applied to data from several pressure vessel steels. The resulting J vs ..delta..a values compare favorably with a resistance curve obtained by the multiple specimen heat-tinting technique for A533, Grade B, Class 1 steel. The method for estimating stable crack growth uses several existing concepts heretofore mainly used separately. These concepts include an approximate expression for J for the compact specimen proposed by Andrews, the effective crack length concept of McCabe and Landes, the UK representation of the crack profile as a pair of straight lines intersecting at a hinge point, and Well's expression, J = m sigma/sub y/delta, for relating the crack-opening displacement to the value of J. The value of the constraint factor, m, at the advancing crack tip is estimated by means of a relation between ductility and fracture toughness. When calculated with respect to the COD at the original fatigue crack tip, the constraint factor, m/sub o/, is found to have a value consistently close to 2.0 for compact and precracked Charpy specimens. The method of estimation requires no auxiliary load-deflection measurements or calculations, and so permits single specimen estimates of stable crack growth to be made without the necessity of making high precision unloading compliance measurements.

Merkle, J.G.; Hudson, C.E.

1979-01-01T23:59:59.000Z

468

Dynamical Energy Analysis - determining wave energy distributions in complex vibro-acoustical structures  

E-Print Network (OSTI)

We propose a new approach towards determining the distribution of mechanical and acoustic wave energy in complex built-up structures. The technique interpolates between standard Statistical Energy Analysis (SEA) and full ray tracing containing both these methods as limiting case. By writing the flow of ray trajectories in terms of linear phase space operators, it is suggested here to reformulate ray-tracing algorithms in terms of boundary operators containing only short ray segments. SEA can now be identified as a low resolution ray tracing algorithm and typical SEA assumptions can be quantified in terms of the properties of the ray dynamics. The new technique presented here enhances the range of applicability of standard SEA considerably by systematically incorporating dynamical correlations wherever necessary. Some of the inefficiencies inherent in typical ray tracing methods can be avoided using only a limited amount of the geometrical ray information. The new dynamical theory - Dynamical Energy Analysis (DEA) - thus provides a universal approach towards determining wave energy distributions in complex structures.

Gregor Tanner

2008-03-12T23:59:59.000Z

469

Coronal Seismology and the Propagation of Acoustic Waves Along Coronal Loops  

E-Print Network (OSTI)

We use a combination of analytical theory, numerical simulation, and data analysis to study the propagation of acoustic waves along coronal loops. We show that the intensity perturbation of a wave depends on a number of factors, including dissipation of the wave energy, pressure and temperature gradients in the loop atmosphere, work action between the wave and a flow, and the sensitivity properties of the observing instrument. In particular, the scale length of the intensity perturbation varies directly with the dissipation scale length (i.e., damping length) and the scale lengths of pressure, temperature, and velocity. We simulate wave propagation in three different equilibrium loop models and find that dissipation and pressure and temperature stratification are the most important effects in the low corona where the waves are most easily detected. Velocity effects are small, and cross-sectional area variations play no direct role for lines-of-sight that are normal to the loop axis. The intensity perturbation scale lengths in our simulations agree very well with the scale lengths we measure in a sample of loops observed by TRACE. The median observed value is 4.35x10^9 cm. In some cases the intensity perturbation increases with height, which is likely an indication of a temperature inversion in the loop (i.e., temperature that decreases with height). Our most important conclusion is that thermal conduction, the primary damping mechanism, is accurately described by classical transport theory. There is no need to invoke anomalous processes to explain the observations.

J. A. Klimchuk; S. E. M. Tanner; I. De Moortel

2004-12-03T23:59:59.000Z

470

Mesoscale meteorological measurements characterizing complex flows  

Science Conference Proceedings (OSTI)

Meteorological measurements are an integral and essential component of any emergency response system for addressing accidental releases from nuclear facilities. An important element of the US Department of Energy`s (DOE`s) Atmospheric Studies in Complex Terrain (ASCOT) program is the refinement and use of state-of-the-art meteorological instrumentation. ASCOT is currently making use of ground-based remote wind sensing instruments such as doppler acoustic sounders (sodars). These instruments are capable of continuously and reliably measuring winds up to several hundred meters above the ground, unattended. Two sodars are currently measuring the winds, as part of ASCOT`s Front Range Study, in the vicinity of DOE`s Rocky Flats Plant (RFP) near Boulder, Colorado. A brief description of ASCOT`s ongoing Front Range Study is given followed by a case study analysis that demonstrates the utility of the meteorological measurement equipment and the complexity of flow phenomena that are experienced near RFP. These complex flow phenomena can significantly influence the transport of the released material and consequently need to be identified for accurate assessments of the consequences of a release.

Hubbe, J.M.; Allwine, K.J.

1993-09-01T23:59:59.000Z

471

A Combine On-Line Acoustic Flowmeter and Fluorocarbon Coolant Mixture Analyzer for The ATLAS Silicon Tracker  

E-Print Network (OSTI)

An upgrade to the ATLAS silicon tracker cooling control system may require a change from C3F8 (octafluoro-propane) to a blend containing 10-30% of C2F6 (hexafluoro-ethane) to reduce the evaporation temperature and better protect the silicon from cumulative radiation damage with increasing LHC luminosity. Central to this upgrade is a new acoustic instrument for the real-time measurement of the C3F8/C2F6 mixture ratio and flow. The instrument and its Supervisory, Control and Data Acquisition (SCADA) software are described in this paper. The instrument has demonstrated a resolution of 3.10-3 for C3F8/C2F6 mixtures with ~20%C2F6, and flow resolution of 2% of full scale for mass flows up to 30gs-1. In mixtures of widely-differing molecular weight (mw), higher mixture precision is possible: a sensitivity of < 5.10-4 to leaks of C3F8 into the ATLAS pixel detector nitrogen envelope (mw difference 160) has been seen. The instrument has many potential applications, including the analysis of mixtures of hydrocarbons, vapours for semi-conductor manufacture and anaesthesia.

A. Bitadze; R. Bates; M. Battistin; S. Berry; P. Bonneau; J. Botelho-Direito; B. DiGirolamo; J. Godlewski; E. Perez-Rodriguez; L. Zwalinski; N. Bousson; G. Hallewell; M. Mathieu; A. Rozanov; G. Boyd; M. Doubek; V. Vacek; M. Vitek; K. Egorov; S. Katunin; S. McMahon; K. Nagai

2012-01-12T23:59:59.000Z