National Library of Energy BETA

Sample records for horizontal copolar channel

  1. 24 CHANNEL GEOPHONE ARRAY FOR HORIZONTAL OR VERTICAL BOREHOLES

    SciTech Connect (OSTI)

    Erik C. Westman

    2002-07-01

    This report describes the technical progress on a project to design and construct a multi-channel geophone array that improves tomographic imaging capabilities in both surface and underground mines. Especially important in the design of the array is sensor placement. One issue related to sensor placement is addressed in this report: the method of emplacing the array in a long, horizontal borehole. Improved imaging capabilities will produce energy, environmental, and economic benefits by increasing exploration accuracy and reducing operating costs.

  2. 24-CHANNEL GEOPHONE ARRAY FOR HORIZONTAL OR VERTICAL BOREHOLES

    SciTech Connect (OSTI)

    Erik C. Westman

    2002-07-01

    This report describes the technical progress on a project to design and construct a multi-channel geophone array that improves tomographic imaging capabilities in both surface and underground mines. Especially important in the design of the array is sensor placement. One issue related to sensor placement is addressed in this report: the development of simple, robust, MSHA-acceptable clamping unit. Improved imaging capabilities will produce energy, environmental, and economic benefits by increasing exploration accuracy and reducing operating costs.

  3. 24-CHANNEL GEOPHONE ARRAY FOR HORIZONTAL OR VERTICAL BOREHOLES

    SciTech Connect (OSTI)

    Erik C. Westman

    2002-07-01

    This report describes the technical progress on a project to design and construct a multi-channel geophone array that improves tomographic imaging capabilities in both surface and underground mines. Especially important in the design of the array is sensor placement. One issue related to sensor placement is addressed in this report: the method for orienting the sensor once it is emplaced in the borehole. If the sensors (geophones) do not have the same orientation, the data will be essentially worthless. Improved imaging capabilities will produce energy, environmental, and economic benefits by increasing exploration accuracy and reducing operating costs.

  4. 24-CHANNEL GEOPHONE ARRAY FOR HORIZONTAL OR VERTICAL BOREHOLES

    SciTech Connect (OSTI)

    Erik C. Westman

    2002-07-01

    This report describes the technical progress on a project to design and construct a multi-channel geophone array that improves tomographic imaging capabilities in both surface and underground mines. Especially important in the design of the array is sensor placement. One issue related to sensor placement is addressed in this report: the method for clamping the sensor once it is emplaced in the borehole. If the sensors (geophones) are not adequately coupled to the surrounding rock mass, the resulting data will be of very poor quality. Improved imaging capabilities will produce energy, environmental, and economic benefits by increasing exploration accuracy and reducing operating costs.

  5. 24-CHANNEL GEOPHONE ARRAY FOR HORIZONTAL OR VERTICAL BOREHOLES

    SciTech Connect (OSTI)

    Erik C. Westman

    2002-08-01

    This report describes the technical progress on a project to design and construct a multi-channel geophone array that improves tomographic imaging capabilities in both surface and underground mines. Especially important in the design of the array is sensor placement. One issue related to sensor placement is addressed in this report: the method for clamping the sensor once it is emplaced in the borehole. If the sensors (geophones) are not adequately coupled to the surrounding rock mass, the resulting data will be of very poor quality. Improved imaging capabilities will produce energy, environmental, and economic benefits by increasing exploration accuracy and reducing operating costs.

  6. 24-CHANNEL GEOPHONE ARRAY FOR HORIZONTAL OR VERTICAL BOREHOLES

    SciTech Connect (OSTI)

    Erik C. Westman

    2003-10-24

    Improved ground-imaging capabilities have enormous potential to increase energy, environmental, and economic benefits by improving exploration accuracy and reducing energy consumption during the mining cycle. Seismic tomography has been used successfully to monitor and evaluate geologic conditions ahead of a mining face. A primary limitation to existing seismic tomography, however, is the placement of sensors. The goal of this project is to develop an array of 24 seismic sensors capable of being mounted in either a vertical or horizontal borehole. Development of this technology reduces energy usage in excavation, transportation, ventilation, and processing phases of the mining operation because less waste is mined and the mining cycle suffers fewer interruptions. This new technology benefits all types of mines, including metal/nonmetal, coal, and quarrying. The primary research tasks focused on sensor placement method, sensor housing and clamping design, and cabling and connector selection. An initial design is described in the report. Following assembly, a prototype was tested in the laboratory as well as at a surface stone quarry. Data analysis and tool performance were used for subsequent design modifications. A final design is described, of which several components are available for patent application. Industry partners have shown clear support for this research and demonstrated an interest in commercialization following project completion.

  7. Flow pattern, void fraction and pressure drop of two-phase air-water flow in a horizontal circular micro-channel

    SciTech Connect (OSTI)

    Saisorn, Sira [Energy Division, The Joint Graduate School of Energy and Environment (JGSEE), King Mongkut's University of Technology Thonburi, Bangmod, Bangkok 10140 (Thailand); Wongwises, Somchai [Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Laboratory (FUTURE), Department of Mechanical Engineering, King Mongkut's University of Technology Thonburi, Bangmod, Bangkok 10140 (Thailand)

    2008-01-15

    Adiabatic two-phase air-water flow characteristics, including the two-phase flow pattern as well as the void fraction and two-phase frictional pressure drop, in a circular micro-channel are experimentally studied. A fused silica channel, 320 mm long, with an inside diameter of 0.53 mm is used as the test section. The test runs are done at superficial velocity of gas and liquid ranging between 0.37-16 and 0.005-3.04 m/s, respectively. The flow pattern map is developed from the observed flow patterns i.e. slug flow, throat-annular flow, churn flow and annular-rivulet flow. The flow pattern map is compared with those of other researchers obtained from different working fluids. The present single-phase experiments also show that there are no significant differences in the data from the use of air or nitrogen gas, and water or de-ionized water. The void fraction data obtained by image analysis tends to correspond with the homogeneous flow model. The two-phase pressure drops are also used to calculate the frictional multiplier. The multiplier data show a dependence on flow pattern as well as mass flux. A new correlation of two-phase frictional multiplier is also proposed for practical application. (author)

  8. Horizontal Advanced Tensiometer

    DOE Patents [OSTI]

    Hubbell, Joel M.; Sisson, James B.

    2004-06-22

    An horizontal advanced tensiometer is described that allows the monitoring of the water pressure of soil positions, particularly beneath objects or materials that inhibit the use of previous monitoring wells. The tensiometer includes a porous cup, a pressure transducer (with an attached gasket device), an adaptive chamber, at least one outer guide tube which allows access to the desired horizontal position, a transducer wire, a data logger and preferably an inner guide tube and a specialized joint which provides pressure on the inner guide tube to maintain the seal between the gasket of the transducer and the adaptive chamber.

  9. Horizontal baffle for nuclear reactors

    DOE Patents [OSTI]

    Rylatt, John A. (Monroeville, PA)

    1978-01-01

    A horizontal baffle disposed in the annulus defined between the core barrel and the thermal liner of a nuclear reactor thereby physically separating the outlet region of the core from the annular area below the horizontal baffle. The horizontal baffle prevents hot coolant that has passed through the reactor core from thermally damaging apparatus located in the annulus below the horizontal baffle by utilizing the thermally induced bowing of the horizontal baffle to enhance sealing while accommodating lateral motion of the baffle base plate.

  10. Shape and dynamics of seepage erosion in a horizontal granular bed

    E-Print Network [OSTI]

    Berhanu, Michael

    We investigate erosion patterns observed in a horizontal granular bed resulting from seepage of water motivated by observation of beach rills and channel growth in larger scale land forms. Our experimental apparatus consists ...

  11. Near wake properties of horizontal axis marine current L. Myers and A.S. Bahaj

    E-Print Network [OSTI]

    Quartly, Graham

    1 Near wake properties of horizontal axis marine current turbines L. Myers and A.S. Bahaj-scale horizontal axis turbine has been have been measured in a large water channel facility. A downstream map with different vertical shear and turbulence distributions. Offshore wind farms are perhaps the most closely

  12. BRAZIL, Belo Horizonte Exchange Program

    E-Print Network [OSTI]

    Fernandez, Eduardo

    BRAZIL, Belo Horizonte Exchange Program Universidade Federal de Minas Gerais (UFMG) Brazil, one and Carnival. Belo Horizonte is the 1st planned city in Brazil and is the capital of Minas Gerais. It has transportation, and spending money. These fees are paid in Brazil and are estimated at R$1,800 Real per month

  13. Nuclear component horizontal seismic restraint

    DOE Patents [OSTI]

    Snyder, Glenn J. (Lynchburg, VA)

    1988-01-01

    A nuclear component horizontal seismic restraint. Small gaps limit horizontal displacement of components during a seismic occurrence and therefore reduce dynamic loadings on the free lower end. The reactor vessel and reactor guard vessel use thicker section roll-forged rings welded between the vessel straight shell sections and the bottom hemispherical head sections. The inside of the reactor guard vessel ring forging contains local vertical dovetail slots and upper ledge pockets to mount and retain field fitted and installed blocks. As an option, the horizontal displacement of the reactor vessel core support cone can be limited by including shop fitted/installed local blocks in opposing alignment with the reactor vessel forged ring. Beams embedded in the wall of the reactor building protrude into apertures in the thermal insulation shell adjacent the reactor guard vessel ring and have motion limit blocks attached thereto to provide to a predetermined clearance between the blocks and reactor guard vessel ring.

  14. 24 CHANNEL GEOPHONE ARRAY FOR HORIZONTAL OR VERTICAL BOREHOLES

    SciTech Connect (OSTI)

    Erik C. Westman

    2003-07-01

    This report describes the technical progress on a project to design and construct a multichannel geophone array that improves tomographic imaging capabilities in both surface and underground mines. No work was completed during this reporting period as project personnel are waiting for the mine to become available for final field testing of the array. Improved imaging capabilities will produce energy, environmental, and economic benefits by increasing exploration accuracy and reducing operating costs.

  15. 24 CHANNEL GEOPHONE ARRAY FOR HORIZONTAL OR VERTICAL BOREHOLES

    SciTech Connect (OSTI)

    Erik C. Westman

    2003-06-01

    This report describes the technical progress on a project to design and construct a multichannel geophone array that improves tomographic imaging capabilities in both surface and underground mines. Especially important in the design of the array is sensor placement. One issue related to sensor placement is addressed in this report: the method for clamping the sensor once it is emplaced in the borehole. If the sensors (geophones) are not adequately coupled to the surrounding rock mass, the resulting data will be of very poor quality. Improved imaging capabilities will produce energy, environmental, and economic benefits by increasing exploration accuracy and reducing operating costs.

  16. 24-CHANNEL GEOPHONE ARRAY FOR HORIZONTAL OR VERTICAL BOREHOLES

    SciTech Connect (OSTI)

    Erik C. Westman

    2003-01-01

    This report describes the technical progress on a project to design and construct a multichannel geophone array that improves tomographic imaging capabilities in both surface and underground mines. Especially important in the design of the array is sensor placement. One issue related to sensor placement is addressed in this report: the method for clamping the sensor once it is emplaced in the borehole. If the sensors (geophones) are not adequately coupled to the surrounding rock mass, the resulting data will be of very poor quality. Improved imaging capabilities will produce energy, environmental, and economic benefits by increasing exploration accuracy and reducing operating costs.

  17. Evaluating GPR polarization effects for imaging fracture channeling and estimating fracture properties

    E-Print Network [OSTI]

    Perll, Chris

    2013-12-31

    . To understand how the polarization of radar waves affects imaging of channelized flow in a horizontal fracture, i) a series of numerical forward models was created with varying fracture aperture, channel orientation, and varying fracture water electrical...

  18. Improved oil recovery using horizontal wells at Elk Hills, California

    SciTech Connect (OSTI)

    Gangle, F.J.; Schultz, K.L.; McJannet, G.S.; Ezekwe, N.

    1995-03-01

    Eight horizontal wells have been drilled and completed in a steeply dipping Stevens sand reservoir in the Elk Hills field, Kern County, California. The subject reservoir, called the Stevens 26R, is a turbidite channel sand deposit one mile wide, three miles long, and one mile deep. Formation beds have a gross thickness up to 1,500 feet and dips as high as 60 degrees on the flanks. The original oil column of 1,810 feet has been pulled down to 200 feet by continual production since 1976. The reservoir management operating strategy has been full pressure maintenance by crestal gas injection since 1976. The steep dip of the formation makes gravity drainage the dominant drive mechanism. Additionally, improved recovery is coming from cycling dry gas through the large secondary gas cap region. The prudent placement of the horizontal wells above the oil/water contact promises to improve oil recovery and extend the operating life of the reservoir. Field results are given to compare the performance of the horizontal wells with the conventional wells. The horizontal wells produce at higher rates, lower draw downs, and lower gas/oil ratio which will extend the life of the project and result in higher recovery.

  19. Horizontal wells improve recovery at the Elk Hills Petroleum Reserve

    SciTech Connect (OSTI)

    Rintoul, B.

    1995-11-01

    In 1988 the US Department of Energy and Bechtel implemented a program to slow production declines in the Elk Hills 26R pool sand of the Naval Petroleum Reserve No. 1. It was also hoped horizontal wells would increase the production rate, decrease gas production and extend economic life of the reservoir. The Stevens sand pool targeted for the project is a high-quality, sand-rich turbidite channel system encapsulated within Miocene Monterey siliceous shales, mudstones and associated sediments. The pool is about 3-miles long by 3/4-mile wide. The paper describes the specifications and drilling of the first four out of the 14 horizontal wells drilled at this facility. Horizontal drilling technology has completely altered the future of the 26R pool. In 1980 estimated ultimate recovery (EUR) from the sand was 211 million bbl. With the latest horizontal well drilling campaign, the pool is expected to pass that estimate in 1997 when oil production is forecasted to be at least 13,000 b/d. EUR form the 26R sand now is more than 250 million bbl, and even that estimate is being revised upward.

  20. Industry survey for horizontal wells. Final report

    SciTech Connect (OSTI)

    Wilson, D.D.; Kaback, D.S. [CDM Federal Programs Corp., Denver, CO (United States); Denhan, M.E. [Westinghouse Savannah River Co., Aiken, SC (United States); Watkins, D. [CDM Federal Programs Corp., Aiken, SC (United States)

    1993-07-01

    An international survey of horizontal environmental wells was performed during May and June of 1993. The purpose of the survey was to provide the environmental industry with an inventory of horizontal environmental wells and information pertaining to the extent of the use of horizontal environmental wells, the variety of horizontal environmental well applications, the types of geologic and hydrogeologic conditions within which horizontal environmental wells have been installed, and the companies that perform horizontal environmental well installations. Other information, such as the cost of horizontal environmental well installations and the results of tests performed on the wells, is not complete but is provided as general information with the caveat that the information should not be used to compare drilling companies. The result of the survey is a catalogue of horizontal environmental wells that are categorized by the objective or use of the wells, the vertical depth of the wells, and the drilling company contracted to install the wells.

  1. INCREMENTAL HORIZONTAL FRAGMENTATION OF DATABASE CLASS OBJECTS

    E-Print Network [OSTI]

    Ezeife, Christie

    INCREMENTAL HORIZONTAL FRAGMENTATION OF DATABASE CLASS OBJECTS C.I. Ezeife School of Computer-orientd databases, Incremental horizontal fragmentation, Distribution Abstract: Horizontal fragments of a class in an object-oriented database system contain subsets of the class extent or instance objects. These fragments

  2. Horizontal well applications in complex carbonate reservoirs

    SciTech Connect (OSTI)

    Rahman, M.; Al-Awami, H.

    1995-10-01

    Over the past four years, Saudi Aramco has drilled over eighty horizontal wells, onshore and offshore. It has successfully applied this technology to develop new reservoirs as well as enhance recovery from its mature fields. This paper presents the reservoir engineering aspects of `horizontal` and `high angle` wells drilled in a major offshore field in Saudi Arabia. It shows how horizontal wells have (a) increased the recovery of bypassed oil, (b) improved well productivity in tight reservoirs, (c) increased production from thin oil zones underlain by water, and (d) improved peripheral injection. The paper discusses the actual performance of the horizontal wells and compares them with offset conventional wells. It presents the results of logging and testing of these wells, and highlights actual field data on (a) relationship between productivity gain and horizontal length, (b) pressure loss along the horizontal wellbore, and (c) effect of heterogeneity on coning an inflow performance.

  3. Hydraulic fracturing slurry transport in horizontal pipes

    SciTech Connect (OSTI)

    Shah, S.N.; Lord, D.L. (Halliburton Services (US))

    1990-09-01

    Horizontal-well activity has increased throughout the industry in the past few years. To design a successful hydraulic fracturing treatment for horizontal wells, accurate information on the transport properties of slurry in horizontal pipe is required. Limited information exists that can be used to estimate critical deposition and resuspension velocities when proppants are transported in horizontal wells with non-Newtonian fracturing gels. This paper presents a study of transport properties of various hydraulic fracturing slurries in horizontal pipes. Flow data are gathered in three transparent horizontal pipes with different diameters. Linear and crosslinked fracturing gels were studied, and the effects of variables--e.g., pipe size; polymer-gelling-agent concentration; fluid rheological properties; crosslinking effects; proppant size, density, and concentrations; fluid density; and slurry pump rate--on critical deposition and resuspension velocities were investigated. Also, equations to estimate the critical deposition and resuspension velocities of fracturing gels are provided.

  4. A Science Service Sfeature-HORIZONTAL RAINBOV~

    E-Print Network [OSTI]

    ?rayed a i t h a A secondary horizontal bov is sometimes seen, i n afidition t o the ( A l l richts reserved

  5. Method and apparatus for drilling horizontal holes in geological structures from a vertical bore

    DOE Patents [OSTI]

    Summers, David A. (Rolla, MO); Barker, Clark R. (Rolla, MO); Keith, H. Dean (Rolla, MO)

    1982-01-01

    This invention is directed to a method and apparatus for drilling horizontal holes in geological strata from a vertical position. The geological structures intended to be penetrated in this fashion are coal seams, as for in situ gasification or methane drainage, or in oil-bearing strata for increasing the flow rate from a pre-existing well. Other possible uses for this device might be for use in the leaching of uranium ore from underground deposits or for introducing horizontal channels for water and steam injections.

  6. Particle Impact Damping in the Horizontal Plane 

    E-Print Network [OSTI]

    Witt, Bryan

    2012-07-16

    Particle impact damping is measured for a cantilevered beam vibrating freely in the horizontal plane. Several particle configurations are investigated beginning with a single particle and progressing to multiple layers of particles. The effects...

  7. Can Planets Influence the Horizontal Branch Morphology?

    E-Print Network [OSTI]

    Noam Soker

    1998-03-19

    As stars which have planetary systems evolve along the red giant branch and expand, they interact with the close planets. The planets deposit angular momentum and energy into the red giant stars' envelopes, both of which are likely to enhance mass loss on the red giant branch. The enhanced mass loss causes the star to become bluer as it turns to the horizontal branch. I propose that the presence of planetary systems, through this mechanism, can explain some anomalies in horizontal branch morphologies. In particular, planetary systems may be related to the ``second parameter'', which determines the distribution of horizontal branch stars on the Hertzsprung-Russel diagram. The proposed scenario predicts that surviving massive planets or brown dwarfs orbit many of the extreme blue horizontal branch stars, at orbital periods of tens days.

  8. Shear horizontal surface acoustic wave microsensor for Class...

    Office of Scientific and Technical Information (OSTI)

    Shear horizontal surface acoustic wave microsensor for Class A viral and bacterial detection. Citation Details In-Document Search Title: Shear horizontal surface acoustic wave...

  9. Discovery Channel

    E-Print Network [OSTI]

    Rogers, John A.

    , bendable surfaces -- think electronic ink on flexible displays. Stretchable electronics work like elasticDiscovery Channel :: News :: Electronics Stretch Out http://dsc.discovery.com/news/briefs/20051226/electronics_tec.html 1 of 3 12/27/2005 10:42 PM December 28, 2005 Favorite Fan SitesFavorite Fan Sites

  10. Ness horizontal-well case study

    SciTech Connect (OSTI)

    Koonsman, T.L. (Mobil Exploration Norway Inc. (Norway)); Purpich, A.J. (Mobil North Sea Ltd. (United Kingdom))

    1992-10-01

    This paper reviews the reservoir management work that led to the recommendation to drill the Ness field horizontal well. It also discusses the poor well performance seen almost immediately after production began and the reasons for that well performance revealed by a postdrill reservoir simulation. Finally, the atypical logging responses observed in the well are discussed.

  11. PHENOMENOLOGY Wireless Channel Modeling

    E-Print Network [OSTI]

    Giridhar, K.

    PHENOMENOLOGY Wireless Channel Modeling Clarke's, Jakes' and modified Jakes' models Koyalkar Raman? What is channel modeling? Wireless channel modeling Modeling Fading ­ Rayleigh Clarke's, Jakes, they are short ranged, motion restricted. Channel Wired - Single Path - Motion Restricted Wireless - Multipath

  12. Horizontal modular dry irradiated fuel storage system

    DOE Patents [OSTI]

    Fischer, Larry E. (Los Gatos, CA); McInnes, Ian D. (San Jose, CA); Massey, John V. (San Jose, CA)

    1988-01-01

    A horizontal, modular, dry, irradiated fuel storage system (10) includes a thin-walled canister (12) for containing irradiated fuel assemblies (20), which canister (12) can be positioned in a transfer cask (14) and transported in a horizontal manner from a fuel storage pool (18), to an intermediate-term storage facility. The storage system (10) includes a plurality of dry storage modules (26) which accept the canister (12) from the transfer cask (14) and provide for appropriate shielding about the canister (12). Each module (26) also provides for air cooling of the canister (12) to remove the decay heat of the irradiated fuel assemblies (20). The modules (26) can be interlocked so that each module (26) gains additional shielding from the next adjacent module (26). Hydraulic rams (30) are provided for inserting and removing the canisters (12) from the modules (26).

  13. Horizontal drilling in shallow, geologically complex reservoirs

    SciTech Connect (OSTI)

    Venable, S.D.

    1992-10-01

    The objective of this project is to test the concept that multiple hydraulic fracturing from a directionally-drilled horizontal well, using the medium radius build rate method, can increase gas production sufficiently to justify economic viability over conventional stimulated vertical wells. The test well is located in Yuma County, Colorado, in a favorable area of established production to avoid exploration risks. This report presents: background information; project description which covers location selection/geologic considerations; and preliminary work plan. (AT)

  14. Horizontal drilling in shallow, geologically complex reservoirs

    SciTech Connect (OSTI)

    Venable, S.D.

    1992-01-01

    The objective of this project is to test the concept that multiple hydraulic fracturing from a directionally-drilled horizontal well, using the medium radius build rate method, can increase gas production sufficiently to justify economic viability over conventional stimulated vertical wells. The test well is located in Yuma County, Colorado, in a favorable area of established production to avoid exploration risks. This report presents: background information; project description which covers location selection/geologic considerations; and preliminary work plan. (AT)

  15. Horizontal subsea trees allow frequent deepwater workovers

    SciTech Connect (OSTI)

    Krenek, M.; Hall, G.; Sheng, W.Z.

    1995-05-01

    Horizontal subsea wellheads have found application in the Liuhua oil field in the South China Sea. These trees allow installation and retrieval of downhole equipment through the tree without having to disturb the tree or its external connections to flow lines, service lines, or control umbilicals. This access to the well is important because the Liuhua wells will be produced with electrical submersible pumps (ESPs), which may have relatively short intervals between maintenance, leading to frequent well work. The wells will be completed subsea in about 300 m of water. The large bore, horizontal trees allow all downhole equipment to be pulled without removal of the subsea tree. This wellhead configuration also provides well control and vertical access to downhole equipment through a conventional marine drilling riser and subsea blowout preventer (BOP), eliminating the need for costly specialized completion risers. Another benefit of the horizontal tree is its extremely compact profile with a low number of valves for well control. Valve size and spacing are decoupled from the size and bore spacing of the tubing hanger. The tree`s low profile geometry reduces costs of manufacturing the tree and framework and optimize load transfer to the wellhead.

  16. Economic viability of multiple-lateral horizontal wells 

    E-Print Network [OSTI]

    Smith, Christopher Jason

    1995-01-01

    Horizontal wells are gaining popularity throughout the petroleum industry as a means to increase well productivity and enhance incremental economics. Horizontal wells provide greater reservoir exposure and are useful in ...

  17. Sidewall containment of liquid metal with horizontal alternating magnetic fields

    DOE Patents [OSTI]

    Praeg, W.F.

    1995-01-31

    An apparatus is disclosed for confining molten metal with a horizontal alternating magnetic field. In particular, this invention employs a magnet that can produce a horizontal alternating magnetic field to confine a molten metal at the edges of parallel horizontal rollers as a solid metal sheet is cast by counter-rotation of the rollers. 19 figs.

  18. Horizontal well hydraulics in leaky aquifers Hongbin Zhan*, Eungyu Park

    E-Print Network [OSTI]

    Zhan, Hongbin

    Horizontal well hydraulics in leaky aquifers Hongbin Zhan*, Eungyu Park Department of Geology presents a general study of horizontal well hydraulics for three aquifer types: a leaky confined aquifer- standing of horizontal well hydraulics under various aquifer conditions. 2. Mathematical model I

  19. Short Paper: OFDM in Deep Water Acoustic Channels with Extremely Long Delay Spread

    E-Print Network [OSTI]

    Zhou, Shengli

    Short Paper: OFDM in Deep Water Acoustic Channels with Extremely Long Delay Spread Zhaohui Wang ABSTRACT Deep water horizontal channels usually have very long de- lay spreads relative to shallow water-block-interference (IBI) in the received signals. In this paper, we consider the application of ZP-OFDM in deep water

  20. USING CORONAL CELLS TO INFER THE MAGNETIC FIELD STRUCTURE AND CHIRALITY OF FILAMENT CHANNELS

    SciTech Connect (OSTI)

    Sheeley, N. R. Jr.; Warren, H. P.; Martin, S. F.; Panasenco, O.

    2013-08-01

    Coronal cells are visible at temperatures of {approx}1.2 MK in Fe XII coronal images obtained from the Solar Dynamics Observatory and Solar Terrestrial Relations Observatory spacecraft. We show that near a filament channel, the plumelike tails of these cells bend horizontally in opposite directions on the two sides of the channel like fibrils in the chromosphere. Because the cells are rooted in magnetic flux concentrations of majority polarity, these observations can be used with photospheric magnetograms to infer the direction of the horizontal field in filament channels and the chirality of the associated magnetic field. This method is similar to the procedure for inferring the direction of the magnetic field and the chirality of the fibril pattern in filament channels from H{alpha} observations. However, the coronal cell observations are easier to use and provide clear inferences of the horizontal field direction for heights up to {approx}50 Mm into the corona.

  1. In situ bioremediation using horizontal wells

    SciTech Connect (OSTI)

    NONE

    1995-04-01

    In Situ Bioremediation (ISB), which is the term used in this report for Gaseous Nutrient Injection for In Situ Bioremediation, remediates soils and ground water contaminated with volatile organic compounds (VOCs) both above and below the water table. ISB involves injection of air and nutrients (sparging and biostimulation) into the ground water and vacuum extraction to remove .VOCs from the vadose zone concomitant with biodegradation of VOCs. The innovation is in the combination of 3 emerging technologies, air stripping, horizontal wells, and bioremediation via gaseous nutrient injection with a baseline technology, soil vapor extraction, to produce a more efficient in situ remediation system.

  2. Decline curve analysis for horizontal wells 

    E-Print Network [OSTI]

    Shih, Min-Yu

    1994-01-01

    Subject; Petroleum Engineering DECLINE CURVE ANALYSIS FOR HORIZONTAL WELLS A Thesis by MIN- YU SHIH Submitted to Texas A8tM University in partial fulfillment of the requirements for the degtee of MASTER OF SCIENCE Approved as to style and content... curves are given as log-log plots of MttdaLLattaad: Fetkovich Type Curve Radial Flow, Circular Reservoir Solutions 12 Transient "Stems" tTransient Flow) 8 001 160 000 x10 Depletion "Stems" (Boundary-Dominated Flow) r)04Arps Equations b 0 0...

  3. Construction of Channels (Indiana)

    Broader source: Energy.gov [DOE]

    Permission is required from the Natural Resources Commission is required for the construction or alteration of artificial channels or improved channels of natural watercourses that connect to any...

  4. Implications of Channelization and

    E-Print Network [OSTI]

    Gray, Matthew

    · Dams · Highways · Irrigation · Levees · Oilfield Canals · Channelization Reasons for Channelization rare Hatchie River burrowing crayfish · TNC "Last Great Place" list BLH Forests · Structurally diverse

  5. Passive magnetic bearing for a horizontal shaft

    DOE Patents [OSTI]

    Post, Richard F.

    2003-12-02

    A passive magnetic bearing is composed of a levitation element and a restorative element. The levitation element is composed of a pair of stationary arcuate ferromagnetic segments located within an annular radial-field magnet array. The magnet array is attached to the inner circumference of a hollow shaft end. An attractive force between the arcuate segments and the magnet array acts vertically to levitate the shaft, and also in a horizontal transverse direction to center the shaft. The restorative element is comprised of an annular Halbach array of magnets and a stationary annular circuit array located within the Halbach array. The Halbach array is attached to the inner circumference of the hollow shaft end. A repulsive force between the Halbach array and the circuit array increases inversely to the radial space between them, and thus acts to restore the shaft to its equilibrium axis of rotation when it is displaced therefrom.

  6. Horizontal Drop of 21- PWR Waste Package

    SciTech Connect (OSTI)

    A.K. Scheider

    2007-01-31

    The objective of this calculation is to determine the structural response of the waste package (WP) dropped horizontally from a specified height. The WP used for that purpose is the 21-Pressurized Water Reactor (PWR) WP. The scope of this document is limited to reporting the calculation results in-terms of stress intensities. This calculation is associated with the WP design and was performed by the Waste Package Design group in accordance with the ''Technical Work Plan for: Waste Package Design Description for LA'' (Ref. 16). AP-3.12Q, ''Calculations'' (Ref. 1 1) is used to perform the calculation and develop the document. The sketches attached to this calculation provide the potential dimensions and materials for the 21-PWR WP design.

  7. Horizontal wind rotor. Final technical report

    SciTech Connect (OSTI)

    Guard, E.J.

    1983-06-30

    A vertical axis wind machine called, ''Horizontal Wind Rotor'' conceived in 1979 by the Grantee E.J. Guard was an effort to marry a new high tech carousel type wind rotor to a basic building design for the purpose of generating practical amounts of electricty. This was directed especially towards high performance power generation, relative to low average wind velocity fields, typically found in Florida. From January 1980 to April 1983 two 1/30 scale wind tunnel type test models of buildings, one round and one square were built. An eight Hartzell shrouded wind tunnel fan machine was designed and built to supply uniform wind velocities for testing. All components of the Horizontal Wind Rotor (HWR) were fabricated, instrumented, mounted on the building models, and tested and modified repeatedly for performance optimization. Aerodynamic consultants, model makers, mechanical and computer engineers and technicians under the direction of E. Guard all teamed up to evolve the size, shape, and placement of the system components. It was recognized early that the machine had to be large in order to extract energy from low wind velocities. It was also noted that there were so many variables in the system, so as to elude analytical computation, that only testing could provide the answers. Consequently, this grant program has provided major contributions to the sparse available data in this little studied field, and set up valuable bench marks in design and power output parameters. This data will be the foundation for incorporating the newly discovered design improvements into the full scale prototype to follow. (Phase II) It is believed that this Rotor design is the only one in the world today that will produce as much power in the lower wind velocity ranges and it is also believed that every objective of the original grant proposal has been met or exceeded.

  8. Zero Discharge Water Management for Horizontal Shale Gas Well...

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

    States Government or any agency thereof." Abstract Hydraulic fracturing technology (fracking), coupled with horizontal drilling, has facilitated exploitation of huge natural gas...

  9. Horizontal well replaces hydraulic fracturing in North Sea gas well

    SciTech Connect (OSTI)

    Reynolds, D.A.; Seymour, K.P. )

    1991-11-25

    This paper reports on excessive water production from hydraulically fractured wells in a poor quality reservoir in the North SEa which prompted the drilling of a horizontal well. Gas production from the horizontal well reached six times that of the offset vertical wells, and no water production occurred. This horizontal well proved commercial the western section of the Anglia field. Horizontal drilling in the North SEa is as an effective technology to enhance hydrocarbon recovery from reservoirs that previously had proven uncommercial with other standard techniques. It is viable for the development of marginal reservoirs, particularly where conditions preclude stimulation from hydraulic fracturing.

  10. Method and application of horizontal slice volumetrics to waterflood management and horizontal drilling

    SciTech Connect (OSTI)

    Deshpande, A.; Flemings, P.B. ); Huang, J. )

    1996-01-01

    A computer mapping program was used to make horizontal slices of pore volume. The goal was to create maps that showed the distribution of pore volume vertically and laterally throughout the reservoir. That information was used for studying waterflood feasibility, monitoring an existing waterflood, and planning a horizontal well. This work was done at the United States Naval Petroleum Reserve No. 1, Elk Hills, CA. The reservoirs are the Miocene aged Northwest Stevens A sands and T N sands. These sands are a series of stacked deep water turbidites draped across the western nose of a plunging anticline. To determine the reservoir sensitivity to the approach used to calculate horizontal slice volume, two methods were tested. The first involves creation of four isochores, bounded above by the sand top or base and below by the slice top or base, whose volumes are combined to give the slice volume. The second involves creation of a grid of the slice itself from which slice volume is calculated.

  11. Method and application of horizontal slice volumetrics to waterflood management and horizontal drilling

    SciTech Connect (OSTI)

    Deshpande, A.; Flemings, P.B.; Huang, J.

    1996-12-31

    A computer mapping program was used to make horizontal slices of pore volume. The goal was to create maps that showed the distribution of pore volume vertically and laterally throughout the reservoir. That information was used for studying waterflood feasibility, monitoring an existing waterflood, and planning a horizontal well. This work was done at the United States Naval Petroleum Reserve No. 1, Elk Hills, CA. The reservoirs are the Miocene aged Northwest Stevens A sands and T & N sands. These sands are a series of stacked deep water turbidites draped across the western nose of a plunging anticline. To determine the reservoir sensitivity to the approach used to calculate horizontal slice volume, two methods were tested. The first involves creation of four isochores, bounded above by the sand top or base and below by the slice top or base, whose volumes are combined to give the slice volume. The second involves creation of a grid of the slice itself from which slice volume is calculated.

  12. Metabolic cost of generating horizontal forces during human running

    E-Print Network [OSTI]

    Kram, Rodger

    . Using a wind tunnel to apply horizontal impeding forces, Pugh (19) showed that the metabolic cost forces. Davies (5) compared the metabolic cost of running with wind resistance vs. wind assistanceMetabolic cost of generating horizontal forces during human running YOUNG-HUI CHANG AND RODGER KRAM

  13. Acid Placement in Acid Jetting Treatments in Long Horizontal Wells 

    E-Print Network [OSTI]

    Sasongko, Hari

    2012-07-16

    In the Middle East, extended reach horizontal wells (on the order of 25,000 feet of horizontal displacement) are commonly acid stimulated by jetting acid out of drill pipe. The acid is jetted onto the face of the openhole wellbore as the drill pipe...

  14. Yaw dynamics of horizontal axis wind turbines

    SciTech Connect (OSTI)

    Hansen, A.C. (Utah Univ., Salt Lake City, UT (United States))

    1992-05-01

    Designers of a horizontal axis wind turbine yaw mechanism are faced with a difficult decision. They know that if they elect to use a yaw- controlled rotor then the system will suffer increased initial cost and increased inherent maintenance and reliability problems. On the other hand, if they elect to allow the rotor to freely yaw they known they will have to account for unknown and random, though bounded, yaw rates. They will have a higher-risk design to trade-off against the potential for cost savings and reliability improvement. The risk of a yaw-free system could be minimized if methods were available for analyzing and understanding yaw behavior. The complexity of yaw behavior has, until recently, discouraged engineers from developing a complete yaw analysis method. The objectives of this work are to (1) provide a fundamental understanding of free-yaw mechanics and the design concepts most effective at eliminating yaw problems, and (2) provide tested design tools and guidelines for use by free-yaw wind systems manufacturers. The emphasis is on developing practical and sufficiently accurate design methods.

  15. Sheared bioconvection in a horizontal tube

    E-Print Network [OSTI]

    O. A. Croze; E. E. Ashraf; M. A. Bees

    2010-10-01

    The recent interest in using microorganisms for biofuels is motivation enough to study bioconvection and cell dispersion in tubes subject to imposed flow. To optimize light and nutrient uptake, many microorganisms swim in directions biased by environmental cues (e.g. phototaxis in algae and chemotaxis in bacteria). Such taxes inevitably lead to accumulations of cells, which, as many microorganisms have a density different to the fluid, can induce hydrodynamic instabilites. The large-scale fluid flow and spectacular patterns that arise are termed bioconvection. However, the extent to which bioconvection is affected or suppressed by an imposed fluid flow, and how bioconvection influences the mean flow profile and cell transport are open questions. This experimental study is the first to address these issues by quantifying the patterns due to suspensions of the gravitactic and gyrotactic green biflagellate alga Chlamydomonas in horizontal tubes subject to an imposed flow. With no flow, the dependence of the dominant pattern wavelength at pattern onset on cell concentration is established for three different tube diameters. For small imposed flows, the vertical plumes of cells are observed merely to bow in the direction of flow. For sufficiently high flow rates, the plumes progressively fragment into piecewise linear diagonal plumes, unexpectedly inclined at constant angles and translating at fixed speeds. The pattern wavelength generally grows with flow rate, with transitions at critical rates that depend on concentration. Even at high imposed flow rates, bioconvection is not wholly suppressed and perturbs the flow field.

  16. Steerable vertical to horizontal energy transducer for mobile robots

    DOE Patents [OSTI]

    Spletzer, Barry L. (Albuquerque, NM); Fischer, Gary J. (Albuquerque, NM); Feddema, John T. (Albuquerque, NM)

    2001-01-01

    The present invention provides a steerable vertical to horizontal energy transducer for mobile robots that less complex and requires less power than two degree of freedom tilt mechanisms. The present invention comprises an end effector that, when mounted with a hopping actuator, translates along axis (typically vertical) actuation into combined vertical and horizontal motion. The end effector, or foot, mounts with an end of the actuator that moves toward the support surface (typically a floor or the earth). The foot is shaped so that the first contact with the support surface is off the axis of the actuator. Off-axis contact with the support surface generates an on-axis force (typically resulting in vertical motion) and a moment orthogonal to the axis. The moment initiates a horizontal tumbling motion, and tilts the actuator so that its axis is oriented with a horizontal component and continued actuation generates both vertical and horizontal force.

  17. Horizontal oil well applications and oil recovery assessment. Volume 1: Success of horizontal well technology, Final report

    SciTech Connect (OSTI)

    Deskins, W.G.; McDonald, W.J.; Knoll, R.G.; Springer, S.J.

    1995-03-01

    Horizontal technology has been applied in over 110 formations in the USA. Volume I of this study addresses the overall success of horizontal technology, especially in less-publicized formations, i.e., other than the Austin Chalk, Bakken, and Niobrara. Operators in the USA. and Canada were surveyed on a formation-by-formation basis by means of a questionnaire. Response data were received describing horizontal well projects in 58 formations in the USA. and 88 in Canada. Operators responses were analyzed for trends in technical and economic success based on lithology (clastics and carbonates) and resource type (light oil, heavy oil, and gas). The potential impact of horizontal technology on reserves was also estimated. A forecast of horizontal drilling activity over the next decade was developed.

  18. Modeling gas flow in PEMFC channels: Part I e Flow pattern transitions and pressure drop in a simulated ex situ channel

    E-Print Network [OSTI]

    Kandlikar, Satish

    . Heat exchangers, refrigeration systems, and mini-tube condensers have adopted minichannels for two-phase flow in the gas channels of a proton exchange membrane fuel cell (PEMFC) is studied with an ex situ and horizontal orientations with two GDLs, e Baseline (Mitsubishi Rayon Co. MRC 105 with 5 wt.% PTFE and coated

  19. Hydrodynamics of vegetated channels

    E-Print Network [OSTI]

    Nepf, Heidi

    This paper highlights some recent trends in vegetation hydrodynamics, focusing on conditions within channels and spanning spatial scales from individual blades, to canopies or vegetation patches, to the channel reach. At ...

  20. A Model For The Transient Temperature Effects Of Horizontal Fluid...

    Open Energy Info (EERE)

    A Model For The Transient Temperature Effects Of Horizontal Fluid Flow In Geothermal Systems Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: A...

  1. The time to reach pseudosteady-state in horizontal wells 

    E-Print Network [OSTI]

    Al-Kahtani, Abdulghafour

    1998-01-01

    Engineers need to estimate the expected productivity of horizontal wells. We need to know how long it takes to reach pseudosteady-state to accept that estimation. When all boundaries influence the pressure distribution in the drainage area...

  2. Experimental and theoretical study of horizontal-axis wind turbines

    E-Print Network [OSTI]

    Anderson, Michael Broughton

    1981-10-20

    An experimental and theoretical study of horizontal-axis wind turbines is undertaken. The theoretical analyses cover the four major areas of aerodynamics, turbulence. aeroelasticity and blade optimisation. EXisting aerodynamic theories based...

  3. Pressure transient testing and productivity analysis for horizontal wells 

    E-Print Network [OSTI]

    Cheng, Yueming

    2004-11-15

    This work studied the productivity evaluation and well test analysis of horizontal wells. The major components of this work consist of a 3D coupled reservoir/wellbore model, a productivity evaluation, a deconvolution ...

  4. Refrigerant forced-convection condensation inside horizontal tubes

    E-Print Network [OSTI]

    Bae, Soonhoon

    1968-01-01

    Condensing heat transfer rates inside a horizontal tube were investigated -for large quality changes across the tube. The proposed correlation is a modification of the work of Rohsenow, Webber and Ling [29]. The result of ...

  5. Simulation studies of waterflood performance with horizontal wells 

    E-Print Network [OSTI]

    Ferreira, Horacio

    1995-01-01

    Two-and three-dimensional simulation studies have been carried out to evaluate waterflood oil recovery in a 40-acre 5-spot pattern using horizontal and vertical well systems. The three-dimensional simulation results indicate that the parameters...

  6. Application of horizontal wells in steeply dipping reservoirs 

    E-Print Network [OSTI]

    Lopez Navarro, Jose David

    1995-01-01

    and the anisotropy of permeability (kv/kh ratio) are the dominant parameters affecting the oil recovery. For thin reservoirs, the location of the horizontal injector will not significantly affect the oil recovery. Simultaneous gas and water injection through...

  7. The Performance of Fractured Horizontal Well in Tight Gas Reservoir 

    E-Print Network [OSTI]

    Lin, Jiajing

    2012-02-14

    Horizontal wells have been used to increase reservoir recovery, especially in unconventional reservoirs, and hydraulic fracturing has been applied to further extend the contact with the reservoir to increase the efficiency of development...

  8. Optimization of fractured well performance of horizontal gas wells 

    E-Print Network [OSTI]

    Magalhaes, Fellipe Vieira

    2009-06-02

    In low-permeability gas reservoirs, horizontal wells have been used to increase the reservoir contact area, and hydraulic fracturing has been further extending the contact between wellbores and reservoirs. This thesis presents an approach...

  9. Horizontal non-contact slumping of flat glass

    E-Print Network [OSTI]

    Sung, Edward, S.M. Massachusetts Institute of Technology

    2013-01-01

    This paper continues the work of M. Akilian and A. Husseini on developing a noncontact glass slumping/shaping process. The shift from vertical slumping to horizontal slumping is implemented and various technologies required ...

  10. Horizontal Code Transfer via Program Fracture and Recombination

    E-Print Network [OSTI]

    Sidiroglou-Douskos, Stelios

    2015-04-14

    We present a new horizontal code transfer technique, program fracture and recombination, for automatically replacing, deleting, and/or combining code from multiple applications. Benefits include automatic generation of new ...

  11. Modeling performance of horizontal, undulating, and multilateral wells 

    E-Print Network [OSTI]

    Kamkom, Rungtip

    2009-05-15

    Horizontal, undulating, and multilateral wells are relatively new alternatives in field development because they can increase the productivity per well and reduce the cost of field development. Because the feasibility of these wells may not be valid...

  12. Water coning calculations for vertical and horizontal wells 

    E-Print Network [OSTI]

    Yang, Weiping

    1990-01-01

    recovery of several wells coning water. Since their type curves are specific for the data they investigated, it can not serve as a general method of coning evaluation. Addington'2 developed a set of gas coning correlations for 3-D coarse grid... for predicting (1) critical coning rate, (2) breakthrough time, and (3) WOR after breakthrough in both vertical and horizontal wells. Two hand calculation methods had been developed in this study. Either of them applies to both vertical and horizontal wells...

  13. Drilling Sideways - A Review of Horizontal Well Technology and Its Domestic Application

    Reports and Publications (EIA)

    1993-01-01

    Focuses primarily on domestic horizontal drilling applications, past and present, and on salient aspects of current and near-future horizontal drilling and completion technology.

  14. Nonexistence of Coherent Structures in Two-Dimensional Inviscid Channel Flow

    E-Print Network [OSTI]

    Kalisch, Henrik

    Abstract Two-dimensional inviscid channel flow of an incompressible fluid is considered. It is shown to the study of transition from laminar flow to turbulence [25]. It follows from the result of this note that this kind of steady flow cannot exist in an inviscid fluid. Imagine a fluid contained in a horizontal

  15. Automated Tracing of Horizontal Neuron Processes During Retinal Development

    SciTech Connect (OSTI)

    Kerekes, Ryan A [ORNL; Martins, Rodrigo [St. Jude Children's Research Hospital; Dyer, Michael A [ORNL; Gleason, Shaun Scott [ORNL; Karakaya, Mahmut [ORNL; Davis, Denise [St. Jude Children's Research Hospital

    2011-01-01

    In the developing mammalian retina, horizontal neurons undergo a dramatic reorganization oftheir processes shortly after they migrate to their appropriate laminar position. This is an importantprocess because it is now understood that the apical processes are important for establishing theregular mosaic of horizontal cells in the retina and proper reorganization during lamination isrequired for synaptogenesis with photoreceptors and bipolar neurons. However, this process isdifficult to study because the analysis of horizontal neuron anatomy is labor intensive and time-consuming. In this paper, we present a computational method for automatically tracing the three-dimensional (3-D) dendritic structure of horizontal retinal neurons in two-photon laser scanningmicroscope (TPLSM) imagery. Our method is based on 3-D skeletonization and is thus able topreserve the complex structure of the dendritic arbor of these cells. We demonstrate theeffectiveness of our approach by comparing our tracing results against two sets of semi-automatedtraces over a set of 10 horizontal neurons ranging in age from P1 to P5. We observe an averageagreement level of 81% between our automated trace and the manual traces. This automatedmethod will serve as an important starting point for further refinement and optimization.

  16. Horizontal displacements contribution to tsunami wave energy balance

    E-Print Network [OSTI]

    Dutykh, Denys; Chubarov, Leonid; Shokin, Yuriy

    2010-01-01

    The main reason for the generation of tsunamis is the deformation of the bottom of the ocean caused by an underwater earthquake. Usually, only the vertical bottom motion is taken into accound while the horizontal displacements are neglected. In the present paper we study both the vertical and the horizontal bottom motion while we propose a novel methodology for reconstructing the bottom coseismic displacements field which is transmitted to the free surface using a new three-dimensional Weakly Nonlinear (WN) approach. We pay a special attention to the evolution of kinetic and potential energies of the resulting wave while the contribution of horizontal displacements into wave energy balance is also quantified. Approaches proposed in this study are illustrated on the July 17, 2006 Java tsunami.

  17. Coiled tubing buckling implication in drilling and completing horizontal wells

    SciTech Connect (OSTI)

    Wu, J.; Juvkam-Wold, H.C.

    1995-03-01

    This paper discusses coiled tubing buckling and load transmission when drilling and completing horizontal wells. Comprehensive analyses and new equations are presented to predict buckling of coiled tubing, slack-off weight transmission, actual bit weight or packer load, and maximum horizontal length. Coiled tubing lock-up and yield due to buckling are also discussed. These equations can also be used for other coiled tubing operations, such as coiled tubing workover, coiled tubing well stimulation, and even for conventional joint-connected drill strings. Calculations based on the equations presented are also compared with the previous literature.

  18. Predicting horizontal well performance in solution-gas drive reservoirs 

    E-Print Network [OSTI]

    Plahn, Sheldon Von

    1986-01-01

    University Chairman of Advisory Committee: Dr. Richard A. Star tzman Drilling horizontal wells to accelerate the recovery of oil is an old idea, but the practice was not widespread. Due to r ecent improvements in drilling technology, interest in drilling... permeability on hoi izontal 33 well pe formance INTRODUCTION Ba~cc~rLiiI The idea of dr illing horizontal wells to accelei ate the recovery of oil dates back to the 1940's. But, due to a lack of reliable directional drilling techniques and a relatively...

  19. TRANSIENT BRIGHTENINGS ASSOCIATED WITH FLUX CANCELLATION ALONG A FILAMENT CHANNEL

    SciTech Connect (OSTI)

    Wang, Y.-M.; Muglach, K. E-mail: karin.muglach@nasa.gov

    2013-02-15

    Filament channels coincide with large-scale polarity inversion lines of the photospheric magnetic field, where flux cancellation continually takes place. High-cadence Solar Dynamics Observatory (SDO) images recorded in He II 30.4 nm and Fe IX 17.1 nm during 2010 August 22 reveal numerous transient brightenings occurring along the edge of a filament channel within a decaying active region, where SDO line-of-sight magnetograms show strong opposite-polarity flux in close contact. The brightenings are elongated along the direction of the filament channel, with linear extents of several arcseconds, and typically last a few minutes; they sometimes have the form of multiple two-sided ejections with speeds on the order of 100 km s{sup -1}. Remarkably, some of the brightenings rapidly develop into larger scale events, forming sheetlike structures that are eventually torn apart by the diverging flows in the filament channel and ejected in opposite directions. We interpret the brightenings as resulting from reconnections among filament-channel field lines having one footpoint located in the region of canceling flux. In some cases, the flow patterns that develop in the channel may bring successive horizontal loops together and cause a cascade to larger scales.

  20. Horizontal Aggregations for Building Tabular Data Sets Carlos Ordonez

    E-Print Network [OSTI]

    Ordonez, Carlos

    Horizontal Aggregations for Building Tabular Data Sets Carlos Ordonez Teradata, NCR San Diego, CA, USA ABSTRACT In a data mining project, a significant portion of time is devoted to building a data set suitable for analysis. In a re- lational database environment, building such data set usu- ally requires

  1. Transient horizontal magnetic fields in solar plage regions

    E-Print Network [OSTI]

    R. Ishikawa; S. Tsuneta; K. Ichimoto; H. Isobe; Y. Katsukawa; B. W. Lites; S. Nagata; T. Shimizu; R. A. Shine; Y. Suematsu; T. D. Tarbell; A. M. Title

    2008-02-13

    We report the discovery of isolated, small-scale emerging magnetic fields in a plage region with the Solar Optical Telescope aboard Hinode. Spectro-polarimetric observations were carried out with a cadence of 34 seconds for the plage region located near disc center. The vector magnetic fields are inferred by Milne-Eddington inversion. The observations reveal widespread occurrence of transient, spatially isolated horizontal magnetic fields. The lateral extent of the horizontal magnetic fields is comparable to the size of photospheric granules. These horizontal magnetic fields seem to be tossed about by upflows and downflows of the granular convection. We also report an event that appears to be driven by the magnetic buoyancy instability. We refer to buoyancy-driven emergence as type1 and convection-driven emergence as type2. Although both events have magnetic field strengths of about 600 G, the filling factor of type1 is a factor of two larger than that of type2. Our finding suggests that the granular convection in the plage regions is characterized by a high rate of occurrence of granular-sized transient horizontal fields.

  2. A Simplified Morphing Blade for Horizontal Axis Wind Turbines

    E-Print Network [OSTI]

    Boyer, Edmond

    A Simplified Morphing Blade for Horizontal Axis Wind Turbines Weijun WANG , St´ephane CARO, Fouad salinas@hotmail.com The aim of designing wind turbine blades is to improve the power capture ability by adjusting the twist of the blade's root and tip. To evaluate the performance of wind turbine blades

  3. TECHNICAL NOTES Determination of Length of a Horizontal Drain

    E-Print Network [OSTI]

    Chahar, B. R.

    (Sherard et al. 1967; Sharma 1991) suggested limits for the upstream and the downstream slopes. Chahar1 Abstract: An earth dam can be prevented from a seepage failure due to softening of the downstream the downstream slope cover and the length of the downstream horizontal drain in homogeneous isotropic

  4. Experimental investigation of a horizontal flexible-membrane wave barrier 

    E-Print Network [OSTI]

    Choi, Hae-Jin

    1997-01-01

    A series of experiments is conducted in a two-dimensional glass-walled wave tank to confirm numerical solutions based on two-dimensional linear hydro-elastic theory for a horizontal flexible-membrane wave barrier. The model test is performed by a...

  5. Automatic Error Elimination by Horizontal Code Transfer across Multiple Applications

    E-Print Network [OSTI]

    Polz, Martin

    Automatic Error Elimination by Horizontal Code Transfer across Multiple Applications Stelios CSAIL, Cambridge, MA, USA Abstract We present Code Phage (CP), a system for automatically transferring. To the best of our knowledge, CP is the first system to automatically transfer code across multiple

  6. Fractional channel multichannel analyzer

    DOE Patents [OSTI]

    Brackenbush, L.W.; Anderson, G.A.

    1994-08-23

    A multichannel analyzer incorporating the features of the present invention obtains the effect of fractional channels thus greatly reducing the number of actual channels necessary to record complex line spectra. This is accomplished by using an analog-to-digital converter in the asynchronous mode, i.e., the gate pulse from the pulse height-to-pulse width converter is not synchronized with the signal from a clock oscillator. This saves power and reduces the number of components required on the board to achieve the effect of radically expanding the number of channels without changing the circuit board. 9 figs.

  7. Horizontal-well pilot waterflood tests shallow, abandoned field

    SciTech Connect (OSTI)

    McAlpine, J.L. ); Joshi, S.D. )

    1991-08-05

    This paper reports on the suitability of using horizontal wells in a waterflood of shallow, partially depleted sands which will be tested in the Jennings field in Oklahoma. The vertical wells drilled in the Jennings field intersect several well-known formations such as Red Fork, Misner, and Bartlesville sand. Most of these formations have been produced over a number of years, and presently no wells are producing in the field. In the 1940s, 1950s, and 1960s, wells were drilled on 10-acre spacing, and the last well was plugged in 1961. The field was produced only on primary production and produced approximately 1 million bbl of oil. Because the field was not waterflooded, a large potential exists to produce from the field using secondary methods. To improve the economics for the secondary process, a combination of horizontal and vertical wells was considered.

  8. Horizontal Integration, an AS – Telecom Network Operations Case Study

    E-Print Network [OSTI]

    Kekovole, Stephen Andaye

    2011-12-16

    the employees to make decisions pertaining to their day to day work activity. This did improve service delivery but it limited the employee to function within his/her silo. Thus the issue of cross team barriers still existed resulting in conflicts between... department to a 12 process. With expertise from each of the departments, these process teams are equipped with the multi-disciplinary expertise to make daily operational decisions. A final component of the horizontal organization is an appraisal...

  9. Horizontal film balance having wide range and high sensitivity

    DOE Patents [OSTI]

    Abraham, B.M.; Miyano, K.; Ketterson, J.B.

    1981-03-05

    A thin-film, horizontal balance instrument is provided for measuring surface tension (surface energy) of thin films suspended on a liquid substrate. The balance includes a support bearing and an optical feedback arrangement for wide-range, high sensitivity measurements. The force on the instrument is balanced by an electromagnet, the current through the magnet providing a measure of the force applied to the instrument. A novel float construction is also disclosed.

  10. Horizontal film balance having wide range and high sensitivity

    DOE Patents [OSTI]

    Abraham, Bernard M. (Oak Park, IL); Miyano, Kenjiro (Downers Grove, IL); Ketterson, John B. (Evanston, IL)

    1983-01-01

    A thin-film, horizontal balance instrument is provided for measuring surface tension (surface energy) of thin films suspended on a liquid substrate. The balance includes a support bearing and an optical feedback arrangement for wide-range, high sensitivity measurements. The force on the instrument is balanced by an electromagnet, the current through the magnet providing a measure of the force applied to the instrument. A novel float construction is also disclosed.

  11. Horizontal film balance having wide range and high sensitivity

    DOE Patents [OSTI]

    Abraham, B.M.; Miyano, K.; Ketterson, J.B.

    1983-11-08

    A thin-film, horizontal balance instrument is provided for measuring surface tension (surface energy) of thin films suspended on a liquid substrate. The balance includes a support bearing and an optical feedback arrangement for wide-range, high sensitivity measurements. The force on the instrument is balanced by an electromagnet, the current through the magnet providing a measure of the force applied to the instrument. A novel float construction is also disclosed. 5 figs.

  12. A mathematical simulation of horizontal drain-hole performance 

    E-Print Network [OSTI]

    Cheng, Thomas Ru-Kang

    1984-01-01

    Science and Technology, Kee-Lung, Taiwan, Republic of China Chairman of Advisory Comnittee: Dr. Ching H. Wu The application of horizontal drain-hole in petroleum industry represents one of the new developments in oil recovery techniques. Many... production condition was simulated. The validity of the computational algorithm employed in the simulator was ascertained using the results obtained from a general purpose black oil simulator, BOSS-AIM. The verification runs were made under a semi...

  13. Natural convection heat transfer within horizontal spent nuclear fuel assemblies

    SciTech Connect (OSTI)

    Canaan, R.E.

    1995-12-01

    Natural convection heat transfer is experimentally investigated in an enclosed horizontal rod bundle, which characterizes a spent nuclear fuel assembly during dry storage and/or transport conditions. The basic test section consists of a square array of sixty-four stainless steel tubular heaters enclosed within a water-cooled rectangular copper heat exchanger. The heaters are supplied with a uniform power generation per unit length while the surrounding enclosure is maintained at a uniform temperature. The test section resides within a vacuum/pressure chamber in order to subject the assembly to a range of pressure statepoints and various backfill gases. The objective of this experimental study is to obtain convection correlations which can be used in order to easily incorporate convective effects into analytical models of horizontal spent fuel systems, and also to investigate the physical nature of natural convection in enclosed horizontal rod bundles in general. The resulting data consist of: (1) measured temperatures within the assembly as a function of power, pressure, and backfill gas; (2) the relative radiative contribution for the range of observed temperatures; (3) correlations of convective Nusselt number and Rayleigh number for the rod bundle as a whole; and (4) correlations of convective Nusselt number as a function of Rayleigh number for individual rods within the array.

  14. Horizontal natural gas storage caverns and methods for producing same

    DOE Patents [OSTI]

    Russo, Anthony (Albuquerque, NM)

    1995-01-01

    The invention provides caverns and methods for producing caverns in bedded salt deposits for the storage of materials that are not solvents for salt. The contemplated salt deposits are of the bedded, non-domed variety, more particularly salt found in layered formations that are sufficiently thick to enable the production of commercially usefully sized caverns completely encompassed by walls of salt of the formation. In a preferred method, a first bore hole is drilled into the salt formation and a cavity for receiving insolubles is leached from the salt formation. Thereafter, at a predetermined distance away from the first bore hole, a second bore hole is drilled towards the salt formation. As this drill approaches the salt, the drill assumes a slant approach and enters the salt and drills through it in a horizontal direction until it intersects the cavity for receiving insolubles. This produces a substantially horizontal conduit from which solvent is controlledly supplied to the surrounding salt formation, leaching the salt and producing a concentrated brine which is removed through the first bore hole. Insolubles are collected in the cavity for receiving insolubles. By controlledly supplying solvent, a horizontal cavern is produced with two bore holes extending therefrom.

  15. Small diameter horizontal hole drilling - state of technology

    SciTech Connect (OSTI)

    NONE

    1984-11-01

    The purpose of this study is to determine the existing state of the art for small diameter, horizontal pilot hole drilling. The data were collected by contacting worldwide owners of raise or slant hole drill equipment, manufacturers of drills and bits, and manufacturers of survey tools. The study was limited to existing equipment and completed trials. Most attempts at directional pilot hole drilling, and most survey tools are designed for near vertical, downward drilling. Several types of controllable bits are available which depend upon in-hole motors and bent or wedged assemblies to bias the direction of drilling. Accurate horizontal drilling can be achieved in this way by alternately drilling and surveying at frequent intervals. This procedure is impractical, however, from both a production and a cost standpoint. A few attempts at directional drilling have been made using ordinary drilling tools, a rotary drill string and a tricone bit. Good equipment and a well trained drill crew appeared to be the most significant factor in practical, accurate drilling, whether horizontal or vertical. Because of the cost, no one uses steerable bit drilling except for correction, and then only for short portions of an overall drill program. No satisfactory continuous readout surveying tool, coupled with a remotely controlled bit capable of direction correction, exists. An industry need exists for a high speed, directional drill bit, coupled with a continuously monitored survey tool. 2 tables.

  16. Flow of fracturing foams in vertical, horizontal and inclined pipes 

    E-Print Network [OSTI]

    Krindinti, Kshipraprasad H

    2002-01-01

    Foams are complex mixtures of a gas and a liquid, with the latter being the continuous phase. The rheological properties of foams are strongly influenced by parameters like temperature, absolute pressure, foam quality, texture, foam-channel wall...

  17. Channel plate for DNA sequencing

    DOE Patents [OSTI]

    Douthart, R.J.; Crowell, S.L.

    1998-01-13

    This invention is a channel plate that facilitates data compaction in DNA sequencing. The channel plate has a length, a width and a thickness, and further has a plurality of channels that are parallel. Each channel has a depth partially through the thickness of the channel plate. Additionally an interface edge permits electrical communication across an interface through a buffer to a deposition membrane surface. 15 figs.

  18. MEMS in microfluidic channels.

    SciTech Connect (OSTI)

    Ashby, Carol Iris Hill; Okandan, Murat; Michalske, Terry A.; Sounart, Thomas L.; Matzke, Carolyn M.

    2004-03-01

    Microelectromechanical systems (MEMS) comprise a new class of devices that include various forms of sensors and actuators. Recent studies have shown that microscale cantilever structures are able to detect a wide range of chemicals, biomolecules or even single bacterial cells. In this approach, cantilever deflection replaces optical fluorescence detection thereby eliminating complex chemical tagging steps that are difficult to achieve with chip-based architectures. A key challenge to utilizing this new detection scheme is the incorporation of functionalized MEMS structures within complex microfluidic channel architectures. The ability to accomplish this integration is currently limited by the processing approaches used to seal lids on pre-etched microfluidic channels. This report describes Sandia's first construction of MEMS instrumented microfluidic chips, which were fabricated by combining our leading capabilities in MEMS processing with our low-temperature photolithographic method for fabricating microfluidic channels. We have explored in-situ cantilevers and other similar passive MEMS devices as a new approach to directly sense fluid transport, and have successfully monitored local flow rates and viscosities within microfluidic channels. Actuated MEMS structures have also been incorporated into microfluidic channels, and the electrical requirements for actuation in liquids have been quantified with an elegant theory. Electrostatic actuation in water has been accomplished, and a novel technique for monitoring local electrical conductivities has been invented.

  19. Horizontal structures in granulite terrains: A record of mountain building or mountain collapse?

    E-Print Network [OSTI]

    Sandiford, Mike

    Horizontal structures in granulite terrains: A record of mountain building or mountain collapse horizontal structures occurred during the metamorphic culmination and was followed by isobaric cooling that no significant erosional denudation fol- lowed the development of the horizontal structures and thus precludes

  20. Hydrodynamic and Structural Performance of the Transverse Horizontal Axis Water Turbine

    E-Print Network [OSTI]

    Gorban, Alexander N.

    of Darrieus vertical axis wind turbine (VAWT) through 90 to lie horizontally across a tidal flow · Stretch power (2) · Vertical axis turbines ­ Blue Energy ­ Polo ­ ... 4 other vertical axis devices · HorizontalHydrodynamic and Structural Performance of the Transverse Horizontal Axis Water Turbine Prof. Guy

  1. EMERGENCE OF HELICAL FLUX AND THE FORMATION OF AN ACTIVE REGION FILAMENT CHANNEL

    SciTech Connect (OSTI)

    Lites, B. W.; Kubo, M.; Berger, T.; Frank, Z.; Shine, R.; Tarbell, T.; Title, A.; Okamoto, T. J.; Otsuji, K.

    2010-07-20

    We present comprehensive observations of the formation and evolution of a filament channel within NOAA Active Region (AR) 10978 from Hinode/Solar Optical Telescope and TRACE. We employ sequences of Hinode spectro-polarimeter maps of the AR, accompanying Hinode Narrowband Filter Instrument magnetograms in the Na I D1 line, Hinode Broadband Filter Instrument filtergrams in the Ca II H line and G-band, Hinode X-ray telescope X-ray images, and TRACE Fe IX 171 A image sequences. The development of the channel resembles qualitatively that presented by Okamoto et al. in that many indicators point to the emergence of a pre-existing sub-surface magnetic flux rope. The consolidation of the filament channel into a coherent structure takes place rapidly during the course of a few hours, and the filament form then gradually shrinks in width over the following two days. Particular to this filament channel is the observation of a segment along its length of horizontal, weak (500 G) flux that, unlike the rest of the filament channel, is not immediately flanked by strong vertical plage fields of opposite polarity on each side of the filament. Because this isolated horizontal field is observed in photospheric lines, we infer that it is unlikely that the channel formed as a result of reconnection in the corona, but the low values of inferred magnetic fill fraction along the entire length of the filament channel suggest that the bulk of the field resides somewhat above the low photosphere. Correlation tracking of granulation in the G band presents no evidence for either systematic flows toward the channel or systematic shear flows along it. The absence of these flows, along with other indications of these data from multiple sources, reinforces (but does not conclusively demonstrate) the picture of an emerging flux rope as the origin of this AR filament channel.

  2. Entanglement-Saving Channels

    E-Print Network [OSTI]

    Ludovico Lami; Vittorio Giovannetti

    2015-05-03

    The set of Entanglement Saving (ES) quantum channels is introduced and characterized. These are completely positive, trace preserving transformations which when acting locally on a bipartite quantum system initially prepared into a maximally entangled configuration, preserve its entanglement even when applied an arbitrary number of times. In other words, a quantum channel $\\psi$ is said to be ES if its powers $\\psi^n$ are not entanglement-breaking for all integers $n$. We also characterize the properties of the Asymptotic Entanglement Saving (AES) maps. These form a proper subset of the ES channels that is constituted by those maps which, not only preserve entanglement for all finite $n$, but which also sustain an explicitly not null level of entanglement in the asymptotic limit~$n\\rightarrow \\infty$. Structure theorems are provided for ES and for AES maps which yield an almost complete characterization of the former and a full characterization of the latter.

  3. Chaos in quantum channels

    E-Print Network [OSTI]

    Hosur, Pavan; Roberts, Daniel A; Yoshida, Beni

    2015-01-01

    We study chaos and scrambling in unitary channels by considering their entanglement properties as states. Using out-of-time-order correlation functions to diagnose chaos, we characterize the ability of a channel to process quantum information. We show that the generic decay of such correlators implies that any input subsystem must have near vanishing mutual information with almost all partitions of the output. Additionally, we propose the negativity of the tripartite information of the channel as a general diagnostic of scrambling. This measures the delocalization of information and is closely related to the decay of out-of-time-order correlators. We back up our results with numerics in two non-integrable models and analytic results in a perfect tensor network model of chaotic time evolution. These results show that the butterfly effect in quantum systems implies the information-theoretic definition of scrambling.

  4. Hybrid Zero-capacity Channels

    E-Print Network [OSTI]

    Sergii Strelchuk; Jonathan Oppenheim

    2012-07-04

    There are only two known kinds of zero-capacity channels. The first kind produces entangled states that have positive partial transpose, and the second one - states that are cloneable. We consider the family of 'hybrid' quantum channels, which lies in the intersection of the above classes of channels and investigate its properties. It gives rise to the first explicit examples of the channels, which create bound entangled states that have the property of being cloneable to the arbitrary finite number of parties. Hybrid channels provide the first example of highly cloneable binding entanglement channels, for which known superactivation protocols must fail - superactivation is the effect where two channels each with zero quantum capacity having positive capacity when used together. We give two methods to construct a hybrid channel from any binding entanglement channel. We also find the low-dimensional counterparts of hybrid states - bipartite qubit states which are extendible and possess two-way key.

  5. Developments in relativistic channeling

    SciTech Connect (OSTI)

    Carrigan, R.A. Jr.

    1996-10-01

    The possibility of using channeling as a tool for high energy accelerator applications and particle physics has now been extensively investigated. Bent crystals have been used for accelerator extraction and for particle deflection. Applications as accelerating devices have been discussed but have not yet been tried. 61 refs., 1 fig.

  6. Developments in relativistic channeling

    SciTech Connect (OSTI)

    Carrigan, R.A. Jr.

    1997-03-01

    The possibility of using channeling as a tool for high energy accelerator applications and particle physics has now been extensively investigated. Bent crystals have been used for accelerator extraction and for particle deflection. Applications as accelerating devices have been discussed but have not yet been tried. {copyright} {ital 1997 American Institute of Physics.}

  7. Storing and Handling Silage In Horizontal Above-Ground Silos. 

    E-Print Network [OSTI]

    Sorenson, J. W. (Jerome Wallace); Weihing, R. M.; Person, N. K.; Allen, W. S.

    1964-01-01

    ......................................................... 9 - -. ' SUMMARY Research conducted at Beaumont ?I$ College 1957-63 resulted in the developing of practical me ing clovers and grasses during weather too wet a haying. The addition of zinc bacatracin to forage at ensiling reduced dry matter... was develoPd fa ically unloading horizontal-type silos. A capacity of 7. silage per hour was obtained with the machine in t sorghum and clover silages. A commercial unl " after the experimental machine, but with incr~, capacity, has been built and tested...

  8. MHK Technologies/Horizon Horizontal Platform | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION J APPENDIXsource HistoryScenarios Towards 2050Enermar < MHK TechnologiesCatHorizontal Platform

  9. MHK Technologies/Horizontal Axis Logarithmic Spiral Turbine | Open Energy

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION J APPENDIXsource HistoryScenarios Towards 2050Enermar < MHK TechnologiesCatHorizontal

  10. Morphology of rain water channelization in systematically varied model sandy soils

    E-Print Network [OSTI]

    Y. Wei; C. M. Cejas; R. Barrois; R. Dreyfus; D. J. Durian

    2014-03-13

    We visualize the formation of fingered flow in dry model sandy soils under different raining conditions using a quasi-2d experimental set-up, and systematically determine the impact of soil grain diameter and surface wetting property on water channelization phenomenon. The model sandy soils we use are random closely-packed glass beads with varied diameters and surface treatments. For hydrophilic sandy soils, our experiments show that rain water infiltrates into a shallow top layer of soil and creates a horizontal water wetting front that grows downward homogeneously until instabilities occur to form fingered flows. For hydrophobic sandy soils, in contrast, we observe that rain water ponds on the top of soil surface until the hydraulic pressure is strong enough to overcome the capillary repellency of soil and create narrow water channels that penetrate the soil packing. Varying the raindrop impinging speed has little influence on water channel formation. However, varying the rain rate causes significant changes in water infiltration depth, water channel width, and water channel separation. At a fixed raining condition, we combine the effects of grain diameter and surface hydrophobicity into a single parameter and determine its influence on water infiltration depth, water channel width, and water channel separation. We also demonstrate the efficiency of several soil water improvement methods that relate to rain water channelization phenomenon, including pre-wetting sandy soils at different level before rainfall, modifying soil surface flatness, and applying superabsorbent hydrogel particles as soil modifiers.

  11. Crosswell Imaging Technology & Advanced DSR Navigation for Horizontal Directional Drilling

    SciTech Connect (OSTI)

    Larry Stolarczyk

    2008-08-08

    The objective of Phase II is to develop and demonstrate real-time measurement-while-drilling (MWD) for guidance and navigation of drill strings during horizontal drilling operations applicable to both short and long holes. The end product of Phase II is a functional drill-string assembly outfitted with a commercial version of Drill String Radar (DSR). Project Objectives Develop and demonstrate a dual-phase methodology of in-seam drilling, imaging, and structure confirmation. This methodology, illustrated in Figure 1, includes: (1) Using RIM to image between drill holes for seam thickness estimates and in-seam structures detection. Completed, February 2005; and (2) Using DSR for real-time MWD guidance and navigation of drillstrings during horizontal drilling operations. Completed, November 2008. As of November 2008, the Phase II portion of Contract DE-FC26-04NT42085 is about 99% complete, including milestones and tasks original outlined as Phase II work. The one percent deficiency results from MSHA-related approvals which have yet to be granted (at the time of reporting). These approvals are pending and are do not negatively impact the scope of work or project objectives.

  12. Radar channel balancing with commutation

    SciTech Connect (OSTI)

    Doerry, Armin Walter

    2014-02-01

    When multiple channels are employed in a pulse-Doppler radar, achieving and maintaining balance between the channels is problematic. In some circumstances the channels may be commutated to achieve adequate balance. Commutation is the switching, trading, toggling, or multiplexing of the channels between signal paths. Commutation allows modulating the imbalance energy away from the balanced energy in Doppler, where it can be mitigated with filtering.

  13. Channeling and Volume Reflection Based Crystal Collimation of Tevatron Circulating Beam Halo (T-980)

    SciTech Connect (OSTI)

    Shiltsev, V.; Annala, G.; Drozhdin, A.; Johnson, T.; Legan, A.; Mokhov, N.; Reilly, R.; Still, D.; Tesarek, R.; Zagel, J.; Peggs, S.; /Brookhaven /CERN /Serpukhov, IHEP /INFN, Ferrara /PNPI, CSTD

    2010-05-01

    The T980 crystal collimation experiment is underway at the Tevatron to determine if this technique could increase 980 GeV beam-halo collimation efficiency at high-energy hadron colliders such as the Tevatron and the LHC. T980 also studies various crystal types and parameters. The setup has been substantially enhanced during the Summer 2009 shutdown by installing a new O-shaped crystal in the horizontal goniometer, as well as adding a vertical goniometer with two alternating crystals (O-shaped and multi-strip) and additional beam diagnostics. First measurements with the new system are quite encouraging, with channeled and volume-reflected beams observed on the secondary collimators as predicted. Investigation of crystal collimation efficiencies with crystals in volume reflection and channeling modes are described in comparison with an amorphous primary collimator. Results on the system performance are presented for the end-of-store studies and for entire collider stores. The first investigation of colliding beam collimation simultaneously using crystals in both the vertical and horizontal plane has been made in the regime with horizontally channeled and vertically volume-reflected beams. Planning is underway for significant hardware improvements during the FY10 summer shutdown and for dedicated studies during the final year of Tevatron operation and also for a 'post-collider beam physics running' period.

  14. Micro-channel plate detector

    SciTech Connect (OSTI)

    Elam, Jeffrey W.; Lee, Seon W.; Wang, Hsien -Hau; Pellin, Michael J.; Byrum, Karen; Frisch, Henry J.

    2015-09-22

    A method and system for providing a micro-channel plate detector. An anodized aluminum oxide membrane is provided and includes a plurality of nanopores which have an Al coating and a thin layer of an emissive oxide material responsive to incident radiation, thereby providing a plurality of radiation sensitive channels for the micro-channel plate detector.

  15. Athermal channeled spectropolarimeter

    DOE Patents [OSTI]

    Jones, Julia Craven

    2015-12-08

    A temperature insensitive (athermal) channeled spectropolarimeter (CSP) is described. The athermal CSP includes a crystal retarder formed of a biaxial crystal. The crystal retarder has three crystal axes, wherein each axis has its own distinct index of refraction. The axes are oriented in a particular manner, causing an amplitude modulating carrier frequency induced by the crystal retarder to be thermally invariant. Accordingly, a calibration beam technique can be used over a relatively wide range of ambient temperatures, with a common calibration data set.

  16. Essays on horizontal merger simulation: the curse of dimensionality, retail price discrimination, and supply channel stage-games 

    E-Print Network [OSTI]

    Pofahl, Geoffrey Michael

    2007-04-25

    .................................................................................................................331 APPENDIX E..................................................................................................................332 VITA...-Stackelberg..................................................158 1 INTRODUCTION Weekly, if not daily, business media is riddled with news of mergers and acquisitions: ?F.T.C. Moves to Stop $2.8 Billion Ice Cream Deal? (Day, 2003); ?Government Regulators Approve Nestlé?s Purchase of Dreyer's? (Ho, 2003...

  17. Static virtual channel allocation in oblivious routing

    E-Print Network [OSTI]

    Shim, Keun Sup

    Most virtual channel routers have multiple virtual channels to mitigate the effects of head-of-line blocking. When there are more flows than virtual channels at a link, packets or flows must compete for channels, either ...

  18. Gravity wave turbulence revealed by horizontal vibrations of the container

    E-Print Network [OSTI]

    Bruno Issenmann; Eric Falcon

    2012-12-20

    We experimentally study the role of the forcing on gravity-capillary wave turbulence. Previous laboratory experiments using spatially localized forcing (vibrating blades) have shown that the frequency power-law exponent of the gravity wave spectrum depends on the forcing parameters. By horizontally vibrating the whole container, we observe a spectrum exponent that does not depend on the forcing parameters for both gravity and capillary regimes. This spatially extended forcing leads to a gravity spectrum exponent in better agreement with the theory than by using a spatially localized forcing. The role of the vessel shape has been also studied. Finally, the wave spectrum is found to scale linearly with the injected power for both regimes whatever the forcing type used.

  19. High-frequency shear-horizontal surface acoustic wave sensor

    DOE Patents [OSTI]

    Branch, Darren W

    2014-03-11

    A Love wave sensor uses a single-phase unidirectional interdigital transducer (IDT) on a piezoelectric substrate for leaky surface acoustic wave generation. The IDT design minimizes propagation losses, bulk wave interferences, provides a highly linear phase response, and eliminates the need for impedance matching. As an example, a high frequency (.about.300-400 MHz) surface acoustic wave (SAW) transducer enables efficient excitation of shear-horizontal waves on 36.degree. Y-cut lithium tantalate (LTO) giving a highly linear phase response (2.8.degree. P-P). The sensor has the ability to detect at the pg/mm.sup.2 level and can perform multi-analyte detection in real-time. The sensor can be used for rapid autonomous detection of pathogenic microorganisms and bioagents by field deployable platforms.

  20. High-frequency shear-horizontal surface acoustic wave sensor

    DOE Patents [OSTI]

    Branch, Darren W

    2013-05-07

    A Love wave sensor uses a single-phase unidirectional interdigital transducer (IDT) on a piezoelectric substrate for leaky surface acoustic wave generation. The IDT design minimizes propagation losses, bulk wave interferences, provides a highly linear phase response, and eliminates the need for impedance matching. As an example, a high frequency (.about.300-400 MHz) surface acoustic wave (SAW) transducer enables efficient excitation of shear-horizontal waves on 36.degree. Y-cut lithium tantalate (LTO) giving a highly linear phase response (2.8.degree. P-P). The sensor has the ability to detect at the pg/mm.sup.2 level and can perform multi-analyte detection in real-time. The sensor can be used for rapid autonomous detection of pathogenic microorganisms and bioagents by field deployable platforms.

  1. A Horizontal Well Program for the Upper Miocene 26R Pool, Elk Hills Field, California

    SciTech Connect (OSTI)

    Reid, S.A. (Bechtel Petroleum Operations, Inc., Tupman, CA (United States)); Kuespert, J.G. (Chevron U.S.A. Inc., Tupman, CA (United States)); McJannet, G.S. (USDOE, Tupman, CA (United States))

    1992-01-01

    The goals of this paper are to (1) summarize the complex geologic and reservoir characteristics of the 26R Pool, (2) note those characteristics and criteria that would make this Pool ideally suited for horizontal well technology, (3) discuss the evolution of horizontal drilling technology and our corresponding development of knowledge about the 26R Pool, and (4) discuss how our objectives have been achieved by utilizing horizontal wells. (VC)

  2. A Horizontal Well Program for the Upper Miocene 26R Pool, Elk Hills Field, California

    SciTech Connect (OSTI)

    Reid, S.A. [Bechtel Petroleum Operations, Inc., Tupman, CA (United States); Kuespert, J.G. [Chevron U.S.A. Inc., Tupman, CA (United States); McJannet, G.S. [USDOE, Tupman, CA (United States)

    1992-07-01

    The goals of this paper are to (1) summarize the complex geologic and reservoir characteristics of the 26R Pool, (2) note those characteristics and criteria that would make this Pool ideally suited for horizontal well technology, (3) discuss the evolution of horizontal drilling technology and our corresponding development of knowledge about the 26R Pool, and (4) discuss how our objectives have been achieved by utilizing horizontal wells. (VC)

  3. Some Practical Considerations Regarding Horizontal Resolution in the First Generation of Operational Convection-Allowing NWP

    E-Print Network [OSTI]

    Droegemeier, Kelvin K.

    Some Practical Considerations Regarding Horizontal Resolution in the First Generation,# JASON J. LEVIT, GREGORY W. CARBIN, CRAIG S. SCHWARTZ,@ MORRIS L. WEISMAN,& KELVIN K. DROEGEMEIER

  4. Open Source Projects as Horizontal Innovation Networks - By and for users

    E-Print Network [OSTI]

    von Hippel, Eric

    2003-02-20

    Innovation development, production, distribution and consumption networks can be built up horizontally – with actors consisting only of innovation users (more precisely, ...

  5. Channel | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION JEnvironmentalBowerbank,CammackFLIR Jump to:RAPIDCavalloCerionChannahon, Illinois: EnergyChannel

  6. Roderick MacKinnon and Ion Channels - Potassium Channels and...

    Office of Scientific and Technical Information (OSTI)

    in Its Natural Habitat Visualizing a Potassium Channel Top National Institutes of Health Grantees Win 2003 Nobel Prize for Chemistry Interview with Roderick MacKinnon, Lasker...

  7. Analytical and Numerical Solutions for the Case of a Horizontal Well with a Radial Power-Law Permeability Distribution--Comparison to the Multi-Fracture Horizontal Case 

    E-Print Network [OSTI]

    Broussard, Ryan Sawyer

    2013-02-08

    of the analytical pDdr solutions at tD=1 for a horizontal well producing at a constant rate, centered in a radial composite cylinder with a power-law permeability distribution in the inner region... ............................................................................ 29 vii FIGURE Page 3.12 Log-log plot of the analytical pDdr solutions at tD=10 for a horizontal well producing at a...

  8. Spectrum of Magnetic Dissipation and Horizontal Electric Currents in the Solar Photosphere

    E-Print Network [OSTI]

    Valentyna Abramenko

    2008-06-09

    A proxy for horizontal electric currents in the solar photosphere was suggested. For a set of evolving active regions (ARs) observed with {\\it Solar and Heliospheric Observatory (SOHO)} Michelson Doppler Imager (MDI) in the high resolution mode, the dissipation spectrum, $k^2E(k)$, and the spatial structure of dissipation, i.e., the Stokes dissipation function $\\epsilon(x,y)$, were calculated from the observed $B_z$ component of the magnetic field. These functions allowed us to calculate (a part of) the horizontal electric current density in the photosphere. It was shown that as an active region emerges, large-scale horizontal electric currents are gradually generated and determine a bulk of dissipation. When an active region decays, the large-scale horizontal currents decay faster than the small-scale ones. The density of horizontal currents in active regions is in the range of $ \\sim (0.008 - 0.028)$ A/m$^2$, that is compatible with the density of vertical currents in active regions. We suggest two possible mechanisms for generation of such horizontal currents in the photosphere. One of them is the drift motions of charged particles in the medium of varying plasma pressure gradient in a horizontal plane at the periphery of a sunspot. Such a drift can produce quasi-circular closed horizontal currents around sunspots. Another possibility could be an existence of horizontal axial current inside a highly twisted horizontal magnetic structure laying in the photosphere along the magnetic neutral line. The horizontal currents may contribute significantly to the dynamics of the photosphere/corona coupling, as well as the estimation of non-potentiality of ARs.

  9. Geometric pumping in autophoretic channels

    E-Print Network [OSTI]

    Sebastien Michelin; Thomas D. Montenegro Johnson; Gabriele De Canio; Nicolas Lobato-Dauzier; Eric Lauga

    2015-05-07

    Many microfluidic devices use macroscopic pressure differentials to overcome viscous friction and generate flows in microchannels. In this work, we investigate how the chemical and geometric properties of the channel walls can drive a net flow by exploiting the autophoretic slip flows induced along active walls by local concentration gradients of a solute species. We show that chemical patterning of the wall is not required to generate and control a net flux within the channel, rather channel geometry alone is sufficient. Using numerical simulations, we determine how geometric characteristics of the wall influence channel flow rate, and confirm our results analytically in the asymptotic limit of lubrication theory.

  10. Zero Discharge Water Management for Horizontal Shale Gas Well Development

    SciTech Connect (OSTI)

    Paul Ziemkiewicz; Jennifer Hause; Raymond Lovett; David Locke Harry Johnson; Doug Patchen

    2012-03-31

    Hydraulic fracturing technology (fracking), coupled with horizontal drilling, has facilitated exploitation of huge natural gas (gas) reserves in the Devonian-age Marcellus Shale Formation (Marcellus) of the Appalachian Basin. The most-efficient technique for stimulating Marcellus gas production involves hydraulic fracturing (injection of a water-based fluid and sand mixture) along a horizontal well bore to create a series of hydraulic fractures in the Marcellus. The hydraulic fractures free the shale-trapped gas, allowing it to flow to the well bore where it is conveyed to pipelines for transport and distribution. The hydraulic fracturing process has two significant effects on the local environment. First, water withdrawals from local sources compete with the water requirements of ecosystems, domestic and recreational users, and/or agricultural and industrial uses. Second, when the injection phase is over, 10 to 30% of the injected water returns to the surface. This water consists of flowback, which occurs between the completion of fracturing and gas production, and produced water, which occurs during gas production. Collectively referred to as returned frac water (RFW), it is highly saline with varying amounts of organic contamination. It can be disposed of, either by injection into an approved underground injection well, or treated to remove contaminants so that the water meets the requirements of either surface release or recycle use. Depending on the characteristics of the RFW and the availability of satisfactory disposal alternatives, disposal can impose serious costs to the operator. In any case, large quantities of water must be transported to and from well locations, contributing to wear and tear on local roadways that were not designed to handle the heavy loads and increased traffic. The search for a way to mitigate the situation and improve the overall efficiency of shale gas production suggested a treatment method that would allow RFW to be used as make-up water for successive fracs. RFW, however, contains dissolved salts, suspended sediment and oils that may interfere with fracking fluids and/or clog fractures. This would lead to impaired well productivity. The major technical constraints to recycling RFW involves: identification of its composition, determination of industry standards for make-up water, and development of techniques to treat RFW to acceptable levels. If large scale RFW recycling becomes feasible, the industry will realize lower transportation and disposal costs, environmental conflicts, and risks of interruption in well development schedules.

  11. Mirrored serpentine flow channels for fuel cell

    DOE Patents [OSTI]

    Rock, Jeffrey Allan (Rochester, NY)

    2000-08-08

    A PEM fuel cell having serpentine flow field channels wherein the input/inlet legs of each channel border the input/inlet legs of the next adjacent channels in the same flow field, and the output/exit legs of each channel border the output/exit legs of the next adjacent channels in the same flow field. The serpentine fuel flow channels may be longer, and may contain more medial legs, than the serpentine oxidant flow channels.

  12. Negative particle planar and axial channeling and channeling collimation

    SciTech Connect (OSTI)

    Carrigan, Richard A., Jr.; /Fermilab

    2009-12-01

    While information exists on high energy negative particle channeling there has been little study of the challenges of negative particle bending and channeling collimation. Partly this is because negative dechanneling lengths are relatively much shorter. Electrons are not particularly useful for investigating negative particle channeling effects because their material interactions are dominated by channeling radiation. Another important factor is that the current central challenge in channeling collimation is the proton-proton Large Hadron Collider (LHC) where both beams are positive. On the other hand in the future the collimation question might reemerge for electon-positron or muon colliders. Dechanneling lengths increase at higher energies so that part of the negative particle experimental challenge diminishes. In the article different approaches to determining negative dechanneling lengths are reviewed. The more complicated case for axial channeling is also discussed. Muon channeling as a tool to investigate dechanneling is also discussed. While it is now possible to study muon channeling it will probably not illuminate the study of negative dechanneling.

  13. Gravity wave turbulence revealed by horizontal vibrations of the container B. Issenmann and E. Falcon

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Gravity wave turbulence revealed by horizontal vibrations of the container B. Issenmann and E: December 20, 2012) We experimentally study the role of the forcing on gravity-capillary wave turbulence that the frequency power-law exponent of the gravity wave spectrum depends on the forcing parameters. By horizontally

  14. Low-frequency interaction between horizontal and overturning gyres in the ocean

    E-Print Network [OSTI]

    Low-frequency interaction between horizontal and overturning gyres in the ocean M. A. Spall1] Low-frequency variability of the horizontal circulation in an idealized, eddy-permitting, numerical model drives the dominant mode of low-frequency variability in the meridional overturning circulation

  15. Analytical study of capture time to a horizontal well Hongbin Zhan*

    E-Print Network [OSTI]

    Zhan, Hongbin

    ; Cleveland, 1994; Sawyer and Lieuallen-Dulam, 1998). This is partially because the cost of drilling Horizontal wells have been widely used in petro- leum industry for oil and gas production (Goode a horizontal well in a shallow aquifer is competitive with drilling a vertical well (Wilson and Kaback, 1993

  16. Horizontal subduction and truncation of the Cocos Plate beneath central Mexico

    E-Print Network [OSTI]

    Clayton, Robert W.

    Horizontal subduction and truncation of the Cocos Plate beneath central Mexico Xyoli Pe from a trans-Mexico temporary broadband seismic network centered on Mexico City, we report that the subducting Cocos Plate beneath central Mexico is horizontal, and tectonically underplates the base

  17. Analysis of wellbore instability in vertical, directional, and horizontal wells using field data

    E-Print Network [OSTI]

    Al-Majed, Abdulaziz Abdullah

    and directional wells is being redeveloped by drilling horizontal wells. The experience gained while drilling vertical and directional wells is not useful for drilling horizontal wells, as the failure rate is 1 in 3 holes. Quantification of drilling problems in sixty wells show that majority are tight holes. Stuck

  18. Aquitard control of stream-aquifer interaction and flow to a horizontal well in coastal aquifers 

    E-Print Network [OSTI]

    Sun, Dongmin

    2007-04-25

    FINITE HORIZONTAL WELL IN CONFINED AQUIFERS..................................................................86 4.1 Introduction ...................................................................................... 87 4.2 Seawater Upconing Profile... under a Horizontal-Well in a Thick Aquifer .............................................................................................90 4.3 Analysis of Critical Condition of Seawater Upconing................... 108 4.4 Discussion...

  19. LQG control of horizontal wind turbines for blades and tower loads alleviation

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    LQG control of horizontal wind turbines for blades and tower loads alleviation A. Pintea*, N of power produced by two bladed horizontal variable speed wind turbines. The proposed controller ensures oscillations and with the tower bending tendency. Keywords: LQG control, Wind turbines, Multi-objective control

  20. Hydraulics of horizontal wells in fractured shallow aquifer systems Eungyu Parka,*, Hongbin Zhanb

    E-Print Network [OSTI]

    Zhan, Hongbin

    Hydraulics of horizontal wells in fractured shallow aquifer systems Eungyu Parka,*, Hongbin Zhanb Accepted 1 May 2003 Abstract An analysis of groundwater hydraulic head in the vicinity of a horizontal well in fractured or porous aquifers considering confined, leaky confined, and water-table aquifer boundary

  1. Groundwater flow to a horizontal or slanted well in an unconfined aquifer

    E-Print Network [OSTI]

    Zhan, Hongbin

    with the horizontal aquifer units; (4) drilling oper- ations are feasible near the ground surfaces that are obstructed groundwater, vapor, or oil improves the effective recovery of fluids. In a case study in a thin oil reservoir, and mine dewatering [Hantush and Papadopulos, 1962]. [4] An early study of fluid flow to a horizontal well

  2. Maintaining Horizontally Partitioned Warehouse School of Computer Science, University of Windsor

    E-Print Network [OSTI]

    Ezeife, Christie

    maintenance cost. The scheme handles all three types of refresh operations. In addition, this paper proposes response time and maintenance cost. This paper proposes a scheme that efficiently maintains horizontally Applications, View Maintenance, Horizontal Partitioning, Performance Improvement. 1 Introduction Different data

  3. Thermal-hydraulic assessment of concrete storage cubicle with horizontal 3013 canisters

    SciTech Connect (OSTI)

    HEARD, F.J.

    1999-04-08

    The FIDAP computer code was used to perform a series of analyses to assess the thermal-hydraulic performance characteristics of the concrete plutonium storage cubicles, as modified for the horizontal placement of 3013 canisters. Four separate models were developed ranging from a full height model of the storage cubicle to a very detailed standalone model of a horizontal 3013 canister.

  4. Construction of an unyielding target for large horizontal impacts.

    SciTech Connect (OSTI)

    Ammerman, Douglas James; Davie, Neil Thomas; Kalan, Robert J.

    2010-10-01

    Sandia National Laboratories has constructed an unyielding target at the end of its 2000-foot rocket sled track. This target is made up of approximately 5 million pounds of concrete, an embedded steel load spreading structure, and a steel armor plate face that varies from 10 inches thick at the center to 4 inches thick at the left and right edges. The target/track combination will allow horizontal impacts at regulatory speeds of very large objects, such as a full-scale rail cask, or high-speed impacts of smaller packages. The load-spreading mechanism in the target is based upon the proven design that has been in use for over 20 years at Sandia's aerial cable facility. That target, with a weight of 2 million pounds, has successfully withstood impact forces of up to 25 million pounds. It is expected that the new target will be capable of withstanding impact forces of more than 70 million pounds. During construction various instrumentation was placed in the target so that the response of the target during severe impacts can be monitored. This paper will discuss the construction of the target and provide insights on the testing capabilities at the sled track with this new target.

  5. Global horizontal irradiance clear sky models : implementation and analysis.

    SciTech Connect (OSTI)

    Stein, Joshua S.; Hansen, Clifford W.; Reno, Matthew J.

    2012-03-01

    Clear sky models estimate the terrestrial solar radiation under a cloudless sky as a function of the solar elevation angle, site altitude, aerosol concentration, water vapor, and various atmospheric conditions. This report provides an overview of a number of global horizontal irradiance (GHI) clear sky models from very simple to complex. Validation of clear-sky models requires comparison of model results to measured irradiance during clear-sky periods. To facilitate validation, we present a new algorithm for automatically identifying clear-sky periods in a time series of GHI measurements. We evaluate the performance of selected clear-sky models using measured data from 30 different sites, totaling about 300 site-years of data. We analyze the variation of these errors across time and location. In terms of error averaged over all locations and times, we found that complex models that correctly account for all the atmospheric parameters are slightly more accurate than other models, but, primarily at low elevations, comparable accuracy can be obtained from some simpler models. However, simpler models often exhibit errors that vary with time of day and season, whereas the errors for complex models vary less over time.

  6. Horizontal underbalanced drilling of gas wells with coiled tubing

    SciTech Connect (OSTI)

    Cox, R.J.; Li, J.; Lupick, G.S.

    1999-03-01

    Coiled tubing drilling technology is gaining popularity and momentum as a significant and reliable method of drilling horizontal underbalanced wells. It is quickly moving into new frontiers. To this point, most efforts in the Western Canadian Basin have been focused towards sweet oil reservoirs in the 900--1300 m true vertical depth (TVD) range, however there is an ever-increasing interest in deeper and gas-producing formations. Significant design challenges on both conventional and coiled tubing drilling operations are imposed when attempting to drill these formations underbalanced. Coiled tubing is an ideal technology for underbalanced drilling due to its absence of drillstring connections resulting in continuous underbalanced capabilities. This also makes it suitable for sour well drilling and live well intervention without the risk of surface releases of reservoir gas. Through the use of pressure deployment procedures it is possible to complete the drilling operation without need to kill the well, thereby maintaining underbalanced conditions right through to the production phase. The use of coiled tubing also provides a means for continuous wireline communication with downhole steering, logging and pressure recording devices.

  7. Horizontally scaling dChache SRM with the Terracotta platform

    SciTech Connect (OSTI)

    Perelmutov, T.; Crawford, M.; Moibenko, A.; Oleynik, G.; /Fermilab

    2011-01-01

    The dCache disk caching file system has been chosen by a majority of LHC experiments Tier 1 centers for their data storage needs. It is also deployed at many Tier 2 centers. The Storage Resource Manager (SRM) is a standardized grid storage interface and a single point of remote entry into dCache, and hence is a critical component. SRM must scale to increasing transaction rates and remain resilient against changing usage patterns. The initial implementation of the SRM service in dCache suffered from an inability to support clustered deployment, and its performance was limited by the hardware of a single node. Using the Terracotta platform, we added the ability to horizontally scale the dCache SRM service to run on multiple nodes in a cluster configuration, coupled with network load balancing. This gives site administrators the ability to increase the performance and reliability of SRM service to face the ever-increasing requirements of LHC data handling. In this paper we will describe the previous limitations of the architecture SRM server and how the Terracotta platform allowed us to readily convert single node service into a highly scalable clustered application.

  8. Horizontal oil well applications and oil recovery assessment. Volume 2: Applications overview, Final report

    SciTech Connect (OSTI)

    Deskins, W.G.; McDonald, W.J.; Knoll, R.G.; Springer, S.J.

    1995-03-01

    Horizontal technology has been applied in over 110 formations in the USA. Volume 1 of this study addresses the overall success of horizontal technology, especially in less-publicized formations, i.e., other than the Austin Chalk, Bakken, and Niobrara. Operators in the USA and Canada were surveyed on a formation-by-formation basis by means of a questionnaire. Response data were received describing horizontal well projects in 58 formations in the USA and 88 in Canada. Operators` responses were analyzed for trends in technical and economic success based on lithology (clastics and carbonates) and resource type (light oil, heavy oil, and gas). The potential impact of horizontal technology on reserves was also estimated. A forecast of horizontal drilling activity over the next decade was developed.

  9. New design of a guidelineless horizontal tree for deepwater ESP wells

    SciTech Connect (OSTI)

    Olijnik, L.A.; Vigesa, S.; Paula, M.T.R.; Figueiredo, M.W. de; Rutherford, H.W.

    1996-12-31

    This paper presents the new design of a horizontal tree for deepwater installation, as a key piece of equipment for application of a Electrical Submersible Pump in Subsea Wells. The production from subsea wells equipped with ESPs is a reality since October/94 with the first installation in Campos Basin. The horizontal tree adds simplicity to workover operations expected to be two to three times more frequency when compared to natural flow or gas lifted wells. The design and fabrication of the deepwater horizontal tree is a result of a Technological Cooperation Agreement. The design incorporates new solutions, mainly in diverless guidelineless connection of power cables and flowlines using the vertical connection system. The guidelineless horizontal subsea tree is fully prepared to be integrated on the new manifolds being designed for the Brazilian deepwater oilfields. The applications of the horizontal trees in subsea ESP wells reduce intervention cost, increasing economical attractiveness and scenarios for the applications of this new boosting technology.

  10. Muon Cooling Channels Eberhard Keil

    E-Print Network [OSTI]

    Keil, Eberhard

    Muon Cooling Channels Eberhard Keil Katharinenstr. 17, DE-10711 Berlin, Germany Abstract Parameters of muon cooling channels are discussed that achieve cooling of a muon beam from initial to final emittances in all three degrees of freedom in a given length. Published theories of ionisation cooling yield

  11. Particle seeding flow system for horizontal shock tube

    SciTech Connect (OSTI)

    Johnston, Stephen [Los Alamos National Laboratory; Garcia, Nicolas J. [Los Alamos National Laboratory; Martinez, Adam A. [Los Alamos National Laboratory; Orlicz, Gregory C. [Los Alamos National Laboratory; Prestridge, Katherine P. [Los Alamos National Laboratory

    2012-08-01

    The Extreme Fluids Team in P-23, Physics Division, studies fluid dynamics at high speeds using high resolution diagnostics. The unsteady forces on a particle driven by a shock wave are not well understood, and they are difficult to model. A horizontal shock tube (HST) is being modified to collect data about the behavior of particles accelerated by shocks. The HST has been used previously for studies of Richtmyer-Meshkov instability using Planar Laser-Induced Fluorescence (PLIF) as well as Particle Image Velocimetry (PIV), diagnostics that measure density and velocity. The purpose of our project is to design a flow system that will introduce particles into the HST. The requirements for this particle flow system (PFS) are that it be non-intrusive, be able to introduce either solid or liquid particles, have an exhaust capability, not interfere with existing diagnostics, and couple with the existing HST components. In addition, the particles must flow through the tube in a uniform way. We met these design criteria by first drawing the existing shock tube and diagnostics and doing an initial design of the ducts for the PFS. We then estimated the losses through the particle flow system from friction and researched possible fans that could be used to drive the particles. Finally, the most challenging component of the design was the coupling to the HST. If we used large inlets, the shock would lose strength as it passed by the inlet, so we designed a novel coupling inlet and outlet that minimize the losses to the shock wave. Our design was reviewed by the Extreme Fluids Team, and it is now being manufactured and built based upon our technical drawings.

  12. Coiled tubing workover saves horizontal well in Lake Maracaibo

    SciTech Connect (OSTI)

    Lizak, K.; Patterson, J.; Suarez, D.; Salas, J.

    1996-12-31

    A slotted liner horizontal completion became stuck while being run. Inflatable packers were to be used to isolate the productive interval from a water-bearing, unconsolidated sand in the curved section of this well. While personnel were deciding how to cement the well, the liner was left in the hole with the inflatable packers unset, and the production tubing was run. Coiled tubing was used to log the well, isolate the productive interval, and remove damage to restore well productivity. Personnel considered all possible options, and a thorough decision-making process guided the workover. Because of severe lost-circulation problems, extensive ``what if`` scenarios were made and updated daily for the engineers on location. Service company and oil company personnel worked together to guarantee the job designs were practical and did not exceed the limits of the equipment on location. Computer simulations of all operations were run to allow corrective action to be taken if unusual circumstances arose. All fluids were thoroughly laboratory tested and witnessed by oil company personnel to ensure job success. Problems on the job included lost circulation, locating the exact positions of the packers and water zone, ensuring correct cement placement, removing mud and workover fluids without damaging the squeeze, and bad weather on Lake Maracaibo. Advantages and disadvantages of all the solutions that were considered are included to assist anyone in a similar situation. Post-job oil production has stabilized at 900 BOPD with no water or sand production. Careful job planning and the versatility of coiled tubing saved this well and proved economical with an estimated payout of 33 days, assuming a price of $12 per barrel of oil.

  13. Information geometry of Gaussian channels

    SciTech Connect (OSTI)

    Monras, Alex; Illuminati, Fabrizio

    2010-06-15

    We define a local Riemannian metric tensor in the manifold of Gaussian channels and the distance that it induces. We adopt an information-geometric approach and define a metric derived from the Bures-Fisher metric for quantum states. The resulting metric inherits several desirable properties from the Bures-Fisher metric and is operationally motivated by distinguishability considerations: It serves as an upper bound to the attainable quantum Fisher information for the channel parameters using Gaussian states, under generic constraints on the physically available resources. Our approach naturally includes the use of entangled Gaussian probe states. We prove that the metric enjoys some desirable properties like stability and covariance. As a by-product, we also obtain some general results in Gaussian channel estimation that are the continuous-variable analogs of previously known results in finite dimensions. We prove that optimal probe states are always pure and bounded in the number of ancillary modes, even in the presence of constraints on the reduced state input in the channel. This has experimental and computational implications. It limits the complexity of optimal experimental setups for channel estimation and reduces the computational requirements for the evaluation of the metric: Indeed, we construct a converging algorithm for its computation. We provide explicit formulas for computing the multiparametric quantum Fisher information for dissipative channels probed with arbitrary Gaussian states and provide the optimal observables for the estimation of the channel parameters (e.g., bath couplings, squeezing, and temperature).

  14. Superconducting solenoids for the MICE channel

    E-Print Network [OSTI]

    2003-01-01

    IEEE Transactions on Applied Superconductivity 13, No. 2 S.SUPERCONDUCTING SOLENOIDS FOR THE MICE CHANNEL* M. A. Green,describes the channel of superconducting solenoids for the

  15. PARTICLE ACCELERATORS; ACCELERATORS; BEAM DUMPS; BENDING; CHANNELING...

    Office of Scientific and Technical Information (OSTI)

    Channeling through Bent Crystals Mack, Stephanie; Ottawa U. SLAC 43 PARTICLE ACCELERATORS; ACCELERATORS; BEAM DUMPS; BENDING; CHANNELING; CRYSTAL LATTICES; DETECTION; FORTRAN;...

  16. Buoyancy eects on heat transfer and temperature proles in horizontal pipe ow of drag-reducing uids

    E-Print Network [OSTI]

    Aguilar, Guillermo

    Buoyancy eects on heat transfer and temperature pro®les in horizontal pipe ¯ow of drag 2000 Elsevier Science Ltd. All rights reserved. 1. Introduction In heated ¯ows in horizontal pipes February 2000 Abstract We have studied the extent to which buoyancy eects in horizontal pipe ¯ows of drag

  17. Interference Channel with State Information 

    E-Print Network [OSTI]

    Zhang, Lili

    2012-10-19

    In this dissertation, we study the state-dependent two-user interference channel, where the state information is non-causally known at both transmitters but unknown to either of the receivers. We first propose two coding ...

  18. The "Z" Channel Sriram Vishwanath

    E-Print Network [OSTI]

    Minnesota, University of

    The "Z" Channel Sriram Vishwanath Dept. of Elec. and Computer Engg. Univ. of Texas at Austin, Austin, TX E-mail : sriram@ece.utexas.edu Nihar Jindal Department of Electrical Engineering Stanford

  19. On sounding in wideband channels

    E-Print Network [OSTI]

    Jing, Sheng, Ph. D. Massachusetts Institute of Technology

    2006-01-01

    (cont.) This approach provides us with a cohesive framework to consider the relative costs and benefits of allotting energy for sounding versus transmission, and for repeated sounding of a single channel versus sounding ...

  20. Regulation of horizontal gene transfer by intercellular peptide signaling in Bacillus subtilis

    E-Print Network [OSTI]

    Auchtung, Jennifer M

    2006-01-01

    Horizontal gene transfer plays an important role in bacterial evolution. Although acquisition of foreign DNA can be beneficial to cells, it can also be detrimental. Therefore, cells that possess mechanisms to regulate ...

  1. Driver mental workload requirements on horizontal curves based on occluded vision test measurements 

    E-Print Network [OSTI]

    Shafer, Mark Anthony

    1994-01-01

    This thesis documents an evaluation of driver mental workload requirements on horizontal curves based on occluded vision test measurements. Driver workload is an important concept in the design of highway systems. A ...

  2. Horizontal Class Fragmentation For Advanced Object Models in a Distributed Object Based System \\Lambda

    E-Print Network [OSTI]

    Ezeife, Christie

    Horizontal Class Fragmentation For Advanced Object Models in a Distributed Object Based System application performance on a Distributed Object Based System (DOBS) requires class fragmentation and vertical fragmentation of relations exist, but fragmentation techniques for class objects in a distributed

  3. Temperature Prediction Model for Horizontal Well with Multiple Fractures in Shale Reservoir 

    E-Print Network [OSTI]

    Yoshida, Nozomu

    2013-04-12

    Fracture diagnostics is a key technology for well performance prediction of a horizontal well in a shale reservoir. The combination of multiple fracture diagnostic techniques gives reliable results, and temperature data has potential to provide more...

  4. Modeling Performance of Horizontal Wells with Multiple Fractures in Tight Gas Reservoirs 

    E-Print Network [OSTI]

    Dong, Guangwei

    2011-02-22

    Multiple transverse fracturing along a horizontal well is a relatively new technology that is designed to increase well productivity by increasing the contact between the reservoir and the wellbore. For multiple transverse fractures, the performance...

  5. Investigation of the influence of stress shadows on horizontal hydraulic fractures from adjacent lateral wells

    E-Print Network [OSTI]

    Investigation of the influence of stress shadows on horizontal hydraulic fractures from adjacent: Unconventional hydraulic fracturing Stress shadow Adjacent lateral wells Simulfrac and zipperfrac Numerical the simultaneous or near simultaneous hydraulic fracturing of adjacent lateral wells to maximize the fracture

  6. A comparative analysis of numerical simulation and analytical modeling of horizontal well cyclic steam injection 

    E-Print Network [OSTI]

    Ravago Bastardo, Delmira Cristina

    2005-08-29

    The main objective of this research is to compare the performance of cyclic steam injection using horizontal wells based on the analytical model developed by Gunadi against that based on numerical simulation. For comparison, a common reservoir...

  7. Automated Optimization Strategies for Horizontal Wellbore and Hydraulic Fracture Stages Placement in Unconventional Gas Reseroirs 

    E-Print Network [OSTI]

    Plaksina, Tatyana

    2015-05-05

    In the last decades rapid advances in horizontal drilling and hydraulic fracturing technologies ensure production of commercial quantities of natural gas from many unconventional reservoirs. Reservoir management and development strategies for shale...

  8. An evaluation of alternative horizontal curve design approaches for rural two-lane highways 

    E-Print Network [OSTI]

    Voigt, Anthony Paul

    1995-01-01

    STATEMENT It has been recognized that accidents are more likely to occur on horizontal curves than on tangent sections of rural two-lane highways. Previous studies have found that accident &equency and severity are greater on the curve sections of rural... Distance L v a Case 2 Distance r- c a' C Case 3 Distance FIGURE 2. Speed Profile Model Cases (4). 16 Superelevation Deficiency Thete have been several ellbrts to determine relationships among accident rates on horizontal curves and independent...

  9. Numerical simualtion of mixed convection over a three-dimensional horizontal backward-facing step 

    E-Print Network [OSTI]

    Barbosa Saldana, Juan Gabriel

    2005-08-29

    -1 NUMERICAL SIMULATION OF MIXED CONVECTION OVER A THREE-DIMENSIONAL HORIZONTAL BACKWARD-FACING STEP A Dissertation by JUAN GABRIEL BARBOSA SALDANA Submitted to the Office of Graduate Studies of Texas A&M University... ? 2005 JUAN GABRIEL BARBOSA SALDANA ALL RIGHTS RESERVED NUMERICAL SIMULATION OF MIXED CONVECTION OVER A THREE-DIMENSIONAL HORIZONTAL BACKWARD-FACING STEP A Dissertation by JUAN GABRIEL BARBOSA SALDANA Submitted to Texas A...

  10. In situ air stripping using horizontal wells. Innovative technology summary report

    SciTech Connect (OSTI)

    NONE

    1995-04-01

    In-situ air stripping employs horizontal wells to inject or sparge air into the ground water and vacuum extract VOC`S from vadose zone soils. The horizontal wells provide better access to the subsurface contamination, and the air sparging eliminates the need for surface ground water treatment systems and treats the subsurface in-situ. A full-scale demonstration was conducted at the Savannah River Plant in an area polluted with trichloroethylene and tetrachloroethylene. Results are described.

  11. Innovative technology summary report: in situ air stripping using horizontal wells

    SciTech Connect (OSTI)

    NONE

    1995-04-01

    In situ air stripping (ISAS) technology was developed to remediate soils and ground water contaminated with volatile organic compounds (VOCs) both above and below the water table. ISAS employs horizontal wells to inject (sparge) air into the ground water and vacuum extract VOCs from vadose zone soils. The innovation is creation of a system that combines two somewhat innovative technologies, air sparging and horizontal wells, with a baseline technology, soil vapor extraction, to produce a more efficient in situ remediation system.

  12. The experimental and theoretical investigaton of a horizontal-axis wind turbine 

    E-Print Network [OSTI]

    Milburn, Robert Terrance

    1977-01-01

    THE EXPERIMENTAL AND THEORETICAL INVESTIGATION OF A HORIZONTAL-AXIS WIND TURBINE A Thesis by ROBERT TERRANCE MILBURN Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement for the degree of MASTER... OF SCIENCE August 1977 Major Subject: Aerospace Engineering THE EXPERIMENTAL AND THEORETICAL INVESTIGATION OF A HORIZONTAL-AXIS WIND TURBINE A Thesis by ROBERT TERRANCE MILBURN Approved as to style and content by: (Chairman of Committee) (Head...

  13. Gauge Field Theory of Horizontal Symmetry Generated by a Central Extension of the Pauli Algebra

    E-Print Network [OSTI]

    Ikuo S. Sogami

    2009-07-07

    The standard model of particle physics is generalized so as to be furnished with a horizontal symmetry generated by an intermediary algebra between simple Lie algebras $\\mathfrak{su}(2)$ and $\\mathfrak{su}(3)$. Above a certain high energy scale $\\breve{\\Lambda}$, the horizontal gauge symmetry is postulated to hold so that the basic fermions, quarks and leptons, form its fundamental triplets, and a triplet and singlet of the horizontal gauge fields distinguish generational degrees of freedom. A horizontal scalar triplet is introduced to make the gauge fields super-massive by breaking the horizontal symmetry at $\\breve{\\Lambda}$. From this scalar triplet, there emerge real scalar fields which do not interact with fermions except for neutrino species and may give substantial influence on evolution of the universe. Another horizontal scalar triplet which breaks the electroweak symmetry at a low energy scale $\\Lambda\\simeq 2\\times 10^2$GeV reproduces all of the results of the Weinberg-Salam theory, produces hierarchical mass matrices with less numbers of unknown parameters in a unified way and predicts six massive scalar particles, some of which might be observed by the future LHC experiment.

  14. Memory effects in quantum channel discrimination

    E-Print Network [OSTI]

    Giulio Chiribella; Giacomo M. D'Ariano; Paolo Perinotti

    2008-04-02

    We consider quantum-memory assisted protocols for discriminating quantum channels. We show that for optimal discrimination of memory channels, memory assisted protocols are needed. This leads to a new notion of distance for channels with memory. For optimal discrimination and estimation of sets of unitary channels memory-assisted protocols are not required.

  15. Entanglement Cost of Quantum Channels

    E-Print Network [OSTI]

    Mario Berta; Fernando Brandao; Matthias Christandl; Stephanie Wehner

    2012-03-23

    The entanglement cost of a quantum channel is the minimal rate at which entanglement (between sender and receiver) is needed in order to simulate many copies of a quantum channel in the presence of free classical communication. In this paper we show how to express this quantity as a regularized optimization of the entanglement formation over states that can be generated between sender and receiver. Our formula is the channel analog of a well-known formula for the entanglement cost of quantum states in terms of the entanglement of formation; and shares a similar relation to the recently shattered hope for additivity. The entanglement cost of a quantum channel can be seen as the analog of the quantum reverse Shannon theorem in the case where free classical communication is allowed. The techniques used in the proof of our result are then also inspired by a recent proof of the quantum reverse Shannon theorem and feature the one-shot formalism for quantum information theory, the post-selection technique for quantum channels as well as von Neumann's minimax theorem. We discuss two applications of our result. First, we are able to link the security in the noisy-storage model to a problem of sending quantum rather than classical information through the adversary's storage device. This not only improves the range of parameters where security can be shown, but also allows us to prove security for storage devices for which no results were known before. Second, our result has consequences for the study of the strong converse quantum capacity. Here, we show that any coding scheme that sends quantum information through a quantum channel at a rate larger than the entanglement cost of the channel has an exponentially small fidelity.

  16. Entanglement Cost of Quantum Channels

    E-Print Network [OSTI]

    Mario Berta; Fernando Brandao; Matthias Christandl; Stephanie Wehner

    2015-11-02

    The entanglement cost of a quantum channel is the minimal rate at which entanglement (between sender and receiver) is needed in order to simulate many copies of a quantum channel in the presence of free classical communication. In this paper we show how to express this quantity as a regularised optimisation of the entanglement formation over states that can be generated between sender and receiver. Our formula is the channel analog of a well-known formula for the entanglement cost of quantum states in terms of the entanglement of formation; and shares a similar relation to the recently shattered hope for additivity. The entanglement cost of a quantum channel can be seen as the analog of the quantum reverse Shannon theorem in the case where free classical communication is allowed. The techniques used in the proof of our result are then also inspired by a recent proof of the quantum reverse Shannon theorem and feature the one-shot formalism for quantum information theory, the post-selection technique for quantum channels as well as Sion's minimax theorem. We discuss two applications of our result. First, we are able to link the security in the noisy-storage model to a problem of sending quantum rather than classical information through the adversary's storage device. This not only improves the range of parameters where security can be shown, but also allows us to prove security for storage devices for which no results were known before. Second, our result has consequences for the study of the strong converse quantum capacity. Here, we show that any coding scheme that sends quantum information through a quantum channel at a rate larger than the entanglement cost of the channel has an exponentially small fidelity.

  17. Wiretap Channel II with a Noisy Main Channel Mohamed Nafea and Aylin Yener

    E-Print Network [OSTI]

    Yener, Aylin

    Wiretap Channel II with a Noisy Main Channel Mohamed Nafea and Aylin Yener Wireless Communications increases. This generalizes the wiretap II model to one with a noisy main channel. I. INTRODUCTION Wyner a discrete memoryless channel (DMC), referred to as the main channel, and an external eavesdropper (Eve

  18. Ceramic membranes having macroscopic channels

    DOE Patents [OSTI]

    Anderson, Marc A. (Madison, WI); Peterson, Reid A. (Madison, WI)

    1996-01-01

    Methods have been developed to make porous ceramic membranes having macroscopic channels therethrough. The novel membranes are formed by temporarily supporting the sol-gel membrane precursor on an organic support which is ultimately removed from the interior of the membrane, preferably by pyrolysis or by chemical destruction. The organic support may also include an inorganic metal portion that remains on destruction of the organic portion, providing structural support and/or chemical reactivity to the membrane. The channels formed when the organic support is destroyed provide the ability to withdraw small catalytic products or size-separated molecules from the metal oxide membrane. In addition, the channel-containing membranes retain all of the advantages of existing porous ceramic membranes.

  19. 6 Equalization of Channels with ISI Many practical channels are bandlimited and linearly distort the

    E-Print Network [OSTI]

    Pulfrey, David L.

    244 6 Equalization of Channels with ISI Many practical channels are bandlimited and linearly distort the transmit signal. In this case, the resulting ISI channel has to be equalized for reliable

  20. LOW HORIZONTAL BETA FUNCTION IN LONG STRAIGHTS OF THE NSLS-II LATTICE

    SciTech Connect (OSTI)

    Fanglei, L.; Bengtsson, J.; Guo, W.; Krinsky, S.; Li, Y.; Yang, L.

    2011-03-28

    The NSLS-II storage ring lattice is comprised of 30 DBA cells arranged in 15 superperiods. There are 15 long straight sections (9.3m) for injection, RF and insertion devices and 15 short straights (6.6m) for insertion devices. In the baseline lattice, the short straights have small horizontal and vertical beta functions but the long straights have large horizontal beta function optimized for injection. In this paper, we explore the possibility of maintaining three long straights with large horizontal beta function while providing the other 12 long straights with smaller horizontal beta function to optimize the brightness of insertion devices. Our study considers the possible linear lattice solutions as well as characterizing the nonlinear dynamics. Results are reported on optimization of dynamic aperture required for good injection efficiency and adequate Touschek lifetime. This paper discusses dynamic aperture optimization for the NSLS-II lattice with alternate high and low horizontal beta function in the long straights, which is proposed for the optimization of the brightness of insertion devices. The linear optics is optimized to meet the requirements of lattice function and source properties. Nonlinear optimization for a lattice with working point at (37.18, 16.2) is performed. Considering the realistic magnets errors and physical apertures, we calculate the frequency maps and plot the tune footprint. The results show that the lattice with high-low beta function has adequate dynamic aperture for good injection efficiency and sufficient Touschek lifetime.

  1. Flow pattern, pressure drop and void fraction of two-phase gas-liquid flow in an inclined narrow annular channel

    SciTech Connect (OSTI)

    Wongwises, Somchai; Pipathattakul, Manop [Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Lab (FUTURE), Department of Mechanical Engineering, King Mongkut's University of Technology Thonburi, Bangmod, Bangkok 10140 (Thailand)

    2006-03-01

    Two-phase flow pattern, pressure drop and void fraction in horizontal and inclined upward air-water two-phase flow in a mini-gap annular channel are experimentally studied. A concentric annular test section at the length of 880mm with an outer diameter of 12.5mm and inner diameter of 8mm is used in the experiments. The flow phenomena, which are plug flow, slug flow, annular flow, annular/slug flow, bubbly/plug flow, bubbly/slug-plug flow, churn flow, dispersed bubbly flow and slug/bubbly flow, are observed and recorded by high-speed camera. A slug flow pattern is found only in the horizontal channel while slug/bubbly flow patterns are observed only in inclined channels. When the inclination angle is increased, the onset of transition from the plug flow region to the slug flow region (for the horizontal channel) and from the plug flow region to slug/bubbly flow region (for inclined channels) shift to a lower value of superficial air velocity. Small shifts are found for the transition line between the dispersed bubbly flow and the bubbly/plug flow, the bubbly/plug flow and the bubbly/slug-plug flow, and the bubbly/plug flow and the plug flow. The rest of the transition lines shift to a higher value of superficial air velocity. Considering the effect of flow pattern on the pressure drop in the horizontal tube at low liquid velocity, the occurrence of slug flow stops the rise of pressure drop for a short while, before rising again after the air velocity has increased. However, the pressure does not rise abruptly in the tubes with {theta}=30{sup o} and 60{sup o} when the slug/bubbly flow occurs. At low gas and liquid velocity, the pressure drop increases, when the inclination angles changes from horizontal to 30{sup o} and 60{sup o}. Void fraction increases with increasing gas velocity and decreases with increasing liquid velocity. After increasing the inclination angle from horizontal to {theta}=30{sup o} and 60{sup o}, the void fraction appears to be similar, with a decreasing trend when the inclination angle increases. (author)

  2. Ion transport through cell membrane channels

    E-Print Network [OSTI]

    Jan Gomulkiewicz; Jacek Miekisz; Stanislaw Miekisz

    2007-06-05

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

  3. Restoration of Abandoned ChannelsRestoration of Abandoned Channels Prepared for KICT, South Korea

    E-Print Network [OSTI]

    Julien, Pierre Y.

    lake Adding Water from Power Plant Increase flow depth Riparian Buffer Prevent channel migration BMPs. · Neck cutoffs ­ Lateral migration increases sinuosity of the channel until two bends connect

  4. EIGHT CHANNEL PROGRAMMABLE PULSE GENERATOR

    E-Print Network [OSTI]

    Kleinfeld, David

    Master-8 EIGHT CHANNEL PROGRAMMABLE PULSE GENERATOR Operation Manual A.M.P.I. A.M.P.I. 123Uzlel St and the programming simple and easy to learn. Master-8 is an attractive unit and you will enjoy working with its eight -- Modes of operation 11 -- Setting the parameters 13 -- Triggering 14 -- Eight stored paradigms 14

  5. Stability of the Horizontal Curvature of the LHC Cryodipoles During Cold Tests

    E-Print Network [OSTI]

    Cano, E D Fernandez; García-Pérez, J; Jeanneret, Jean Bernard; Poncet, A; Seyvet, F; Tovar-Gonzalez, A; Wildner, E; IEEE Trans. Nucl. Sci.

    2006-01-01

    The LHC will be composed of 1232 horizontally curved, 15 meter long, superconducting dipole magnets cooled at 1.9 K. They are supported within their vacuum vessel by three Glass Fiber Reinforced Epoxy (GFRE) support posts. Each cryodipole is individually cold tested at CERN before its installation and interconnection in the LHC 27 km circumference tunnel. As the magnet geometry under cryogenic operation is extremely important for the LHC machine aperture, a new method has been developed at CERN in order to monitor the magnet curvature change between warm and cold states. It enabled us to conclude that there is no permanent horizontal curvature change of the LHC dipole magnet between warm and cold states, although a systematic horizontal transient deformation during cool-down was detected. This deformation generates loads in the dipole supporting system; further investigation permitted us to infer this behavior to the asymmetric thermal contraction of the rigid magnet thermal shield during cool-down. Controlli...

  6. Tracking granules on the Sun's surface and reconstructing horizontal velocity fields: I. the CST algorithm

    E-Print Network [OSTI]

    M. Rieutord; T. Roudier; S. Roques; C. Ducottet

    2007-07-13

    Determination of horizontal velocity fields on the solar surface is crucial for understanding the dynamics of structures like mesogranulation or supergranulation or simply the distribution of magnetic fields. We pursue here the development of a method called CST for coherent structure tracking, which determines the horizontal motion of granules in the field of view. We first devise a generalization of Strous method for the segmentation of images and show that when segmentation follows the shape of granules more closely, granule tracking is less effective for large granules because of increased sensitivity to granule fragmentation. We then introduce the multi-resolution analysis on the velocity field, based on Daubechies wavelets, which provides a view of this field on different scales. An algorithm for computing the field derivatives, like the horizontal divergence and the vertical vorticity, is also devised. The effects from the lack of data or from terrestrial atmospheric distortion of the images are also briefly discussed.

  7. Volume III, Chapter 9 Channel Catfish

    E-Print Network [OSTI]

    Volume III, Chapter 9 Channel Catfish #12;TABLE OF CONTENTS 9.0 Channel Catfish (Ictalurus................................................................................................... 9-6 9.4.3 Water Development.............................................................................................. 9-6 9.4.4 Water Quality

  8. Process tomography for unitary quantum channels

    SciTech Connect (OSTI)

    Gutoski, Gus; Johnston, Nathaniel

    2014-03-15

    We study the number of measurements required for quantum process tomography under prior information, such as a promise that the unknown channel is unitary. We introduce the notion of an interactive observable and we show that any unitary channel acting on a d-level quantum system can be uniquely identified among all other channels (unitary or otherwise) with only O(d{sup 2}) interactive observables, as opposed to the O(d{sup 4}) required for tomography of arbitrary channels. This result generalizes to the problem of identifying channels with at most q Kraus operators, and slight improvements can be obtained if we wish to identify such a channel only among unital channels or among other channels with q Kraus operators. These results are proven via explicit construction of large subspaces of Hermitian matrices with various conditions on rank, eigenvalues, and partial trace. Our constructions are built upon various forms of totally nonsingular matrices.

  9. Outage Probability Under Channel Distribution Uncertainty

    E-Print Network [OSTI]

    Loyka, Sergey

    Outage Probability Under Channel Distribution Uncertainty Ioanna Ioannou, Charalambos D. Charalambous and Sergey Loyka Abstract--Outage probability of a class of block-fading (MIMO) channels outage probability defined as min (over the input distribution) -max (over the channel distribution class

  10. Introduction Final Cooling Channel -High Frequency RF

    E-Print Network [OSTI]

    McDonald, Kirk

    Outline Introduction Final Cooling Channel - High Frequency RF Muon Collider Final Cooling Hisham Sayed February 27, 2014 1 / 10 #12;Outline Introduction Final Cooling Channel - High Frequency RF Table of Contents 1 Introduction 2 Final Cooling Channel - High Frequency RF 2 / 10 #12;Outline Introduction Final

  11. Multiple channel data acquisition system

    DOE Patents [OSTI]

    Crawley, H.B.; Rosenberg, E.I.; Meyer, W.T.; Gorbics, M.S.; Thomas, W.D.; McKay, R.L.; Homer, J.F. Jr.

    1990-05-22

    A multiple channel data acquisition system for the transfer of large amounts of data from a multiplicity of data channels has a plurality of modules which operate in parallel to convert analog signals to digital data and transfer that data to a communications host via a FASTBUS. Each module has a plurality of submodules which include a front end buffer (FEB) connected to input circuitry having an analog to digital converter with cache memory for each of a plurality of channels. The submodules are interfaced with the FASTBUS via a FASTBUS coupler which controls a module bus and a module memory. The system is triggered to effect rapid parallel data samplings which are stored to the cache memories. The cache memories are uploaded to the FEBs during which zero suppression occurs. The data in the FEBs is reformatted and compressed by a local processor during transfer to the module memory. The FASTBUS coupler is used by the communications host to upload the compressed and formatted data from the module memory. The local processor executes programs which are downloaded to the module memory through the FASTBUS coupler. 25 figs.

  12. 1 Spreading and convective dissolution of carbon dioxide in vertically 2 confined, horizontal aquifers

    E-Print Network [OSTI]

    Neufeld, Jerome A.

    1 Spreading and convective dissolution of carbon dioxide in vertically 2 confined, horizontal] Injection of carbon dioxide (CO2) into saline aquifers is a promising tool for reducing 6 anthropogenic CO2 emissions. At reservoir conditions, the injected CO2 is buoyant relative 7 to the ambient groundwater

  13. Spreading and convective dissolution of carbon dioxide in vertically confined, horizontal aquifers

    E-Print Network [OSTI]

    Huppert, Herbert

    Spreading and convective dissolution of carbon dioxide in vertically confined, horizontal aquifers of carbon dioxide (CO2) into saline aquifers is a promising tool for reducing anthropogenic CO2 emissions. At reservoir conditions, the injected CO2 is buoyant relative to the ambient groundwater. The buoyant plume

  14. On the Characterization and Computation of Nash Equilibria on Parallel Networks with Horizontal Queues

    E-Print Network [OSTI]

    On the Characterization and Computation of Nash Equilibria on Parallel Networks with Horizontal to Nash equilibria. The article expands studies on routing games which traditionally model congestion that there may exist multiple Nash equilibria with different total costs, which contrasts with results

  15. Multidisciplinary Design Optimization for Glass-Fiber Epoxy-Matrix Composite 5 MW Horizontal-Axis

    E-Print Network [OSTI]

    Grujicic, Mica

    .S. energy needs will be met by various onshore and offshore wind-farms (a collection of wind turbines to as the horizontal axis wind turbine (HAWT). A photograph of an offshore wind turbine is pro- vided in Fig. 1. All-Axis Wind-Turbine Blades M. Grujicic, G. Arakere, B. Pandurangan, V. Sellappan, A. Vallejo, and M. Ozen

  16. Horizontal Heat Exchanger Design and Analysis for Passive Heat Removal Systems

    SciTech Connect (OSTI)

    Vierow, Karen

    2005-08-29

    This report describes a three-year project to investigate the major factors of horizontal heat exchanger performance in passive containment heat removal from a light water reactor following a design basis accident LOCA (Loss of Coolant Accident). The heat exchanger studied in this work may be used in advanced and innovative reactors, in which passive heat removal systems are adopted to improve safety and reliability The application of horizontal tube-bundle condensers to passive containment heat removal is new. In order to show the feasibility of horizontal heat exchangers for passive containment cooling, the following aspects were investigated: 1. the condensation heat transfer characteristics when the incoming fluid contains noncondensable gases 2. the effectiveness of condensate draining in the horizontal orientation 3. the conditions that may lead to unstable condenser operation or highly degraded performance 4. multi-tube behavior with the associated secondary-side effects This project consisted of two experimental investigations and analytical model development for incorporation into industry safety codes such as TRAC and RELAP. A physical understanding of the flow and heat transfer phenomena was obtained and reflected in the analysis models. Two gradute students (one funded by the program) and seven undergraduate students obtained research experience as a part of this program.

  17. Compact fluorescent lamp using horizontal and vertical insulating septums and convective venting geometry

    DOE Patents [OSTI]

    Siminovitch, M.

    1998-02-10

    A novel design is described for a compact fluorescent lamp, including a lamp geometry which will increase light output and efficacy of the lamp in a base down operating position by providing horizontal and vertical insulating septums positioned in the ballast compartment of the lamp to provide a cooler coldspot. Selective convective venting provides additional cooling of the ballast compartment. 9 figs.

  18. OPPORTUNITIES FOR HORIZONTAL DIVERSIFICATION IN MANUFACTURING VALUE-ADDED WOOD PRODUCTS

    E-Print Network [OSTI]

    Wu, Qinglin

    OPPORTUNITIES FOR HORIZONTAL DIVERSIFICATION IN MANUFACTURING VALUE-ADDED WOOD PRODUCTS Working Post Doctoral Researcher Wood Products Processing Richard Vlosky Assistant Professor Forest Products Marketing February 7, 1996 #12;2 ABSTRACT A study of equipment usage in the Louisiana secondary wood

  19. A Parametric Study on the Benefits of Drilling Multilateral and Horizontal Wells in

    E-Print Network [OSTI]

    Mohaghegh, Shahab

    A Parametric Study on the Benefits of Drilling Multilateral and Horizontal Wells in Coalbed Methane;motivation > CBM Background Time Productionrate,MSCF/dorbbl/d Phase 1 Well dewatered Phase 2: - Significant Productionrate,MSCF/dorbbl/d Phase 1 Well dewatered Peak gas rate Phase 3: - Gas rate starts to decline - Water

  20. Hydraulic Fracturing and Horizontal Gas Well Drilling Reference List Updated December 7, 2011

    E-Print Network [OSTI]

    Manning, Sturt

    Hydraulic Fracturing and Horizontal Gas Well Drilling Reference List Updated December 7, 2011. References to popular press and advocacy groups, both of which are numerous and described in detail elsewhere of Hydraulic Fracturing in the Shale Plays (2010). Tudor Pickering Holt & Co with Reservoir Research Partners

  1. The Coulomb Pump: a Novel Parts Feeding Method using a Horizontally-Vibrating Surface

    E-Print Network [OSTI]

    Canny, John

    The Coulomb Pump: a Novel Parts Feeding Method using a Horizontally-Vibrating Surface Dan Reznik. Each vibration is a pump-like" motion along a single degree of freedom: the plate spends more time accuracy nor with premature part wear due to repeated collisions with the feeder. In the spirit

  2. Horizontal structure of winter time 250 mb jet stream variations on the fifteen day time scale 

    E-Print Network [OSTI]

    Park, Sangwook

    1993-01-01

    The horizontal structure of the 250 mb jet stream on the fifteen-day time scale during Northern Hemisphere winter is presented. The winter season is divided into six fifteen-day periods for the 24-year NMC data set. The fifteen-day time...

  3. Hydraulic Fracturing and Horizontal Gas Well Drilling Reference List Updated September 13, 2012

    E-Print Network [OSTI]

    Walter, M.Todd

    Hydraulic Fracturing and Horizontal Gas Well Drilling Reference List Updated September 13, 2012 of Hydraulic Fracturing in the Shale Plays (2010). Tudor Pickering Holt & Co with Reservoir Research Partners, with a thoughtful discussion Plan to Study the Potential Impacts of Hydraulic Fracturing on Drinking Water Resources

  4. A Comparison of Vehicle Speed at Day and Night Rural Horizontal Curves 

    E-Print Network [OSTI]

    Quaium, Ridwan B.

    2010-07-14

    This thesis documents the linear mixed model developed for vehicle speed along two-lane two-way rural horizontal curves in the outside lane. Speed data at each curve was collected at four points along the curve including the midpoint of the curve...

  5. Three-dimensional solutions for coating flow on a rotating horizontal cylinder: Theory and experiment

    E-Print Network [OSTI]

    Evans, Peter

    Three-dimensional solutions for coating flow on a rotating horizontal cylinder: Theory 2005 We present three-dimensional numerical simulations of the flow of a thin liquid coating in the formation of a relatively thick coating where the cylinder surface moves upward. For coatings which

  6. Horizontal Decomposition of Triangulated Solids for the Simulation of Dip-coating Processes

    E-Print Network [OSTI]

    Jüttler, Bert

    Horizontal Decomposition of Triangulated Solids for the Simulation of Dip-coating Processes B, Austria b Magna Powertrain Engineering Center Steyr GmbH & Co.KG, St. Valentin, Austria Abstract In dip-coating Introduction Car bodies or body parts in the automotive industry are covered by several coatings, e

  7. Hydraulics of a finite-diameter horizontal well with wellbore storage and skin effect

    E-Print Network [OSTI]

    Zhan, Hongbin

    Hydraulics of a finite-diameter horizontal well with wellbore storage and skin effect Eungyu Park, hydrogeologists have studied hydraulics of hori- zontal wells in shallow ground water aquifers [5,43,50­ 52 from the aquifer. Extensive studies on hydraulics of finite or large di- ameter vertical wells

  8. Asymmetric mixing transport: a horizontal transport mechanism for sinking plankton and sediment in tidal flows

    E-Print Network [OSTI]

    Pringle, James "Jamie"

    Asymmetric mixing transport: a horizontal transport mechanism for sinking plankton and sediment in tidal flows James M. Pringle1 and Peter J.S. Franks2 SIO-UCSD, Mail Stop 0218 La Jolla, California 92093-0218 Running Head: Asymmetric Mixing Transport and Plankton 1 jmpringle@ucsd.edu 2 pfranks@ucsd.edu 1 #12

  9. Fine-scale Horizontal Structure of Arctic Mixed-Phase Clouds M. Rambukkange1

    E-Print Network [OSTI]

    Brookhaven National Laboratory, 4 CIRES and NOAA-ETL (Corresponding author: J. Verlinde, 502 Walker Building. Above this layer, separated by a strong inversion, was the remnant of a small decaying lee-side low. Figure 1 shows the dry and dew point temperatures and horizontal wind component profiles through

  10. Heat Transfer Measurements for a Horizontal Micro-Tube Using Liquid Crystal Thermography

    E-Print Network [OSTI]

    Ghajar, Afshin J.

    62 TC02-007 Heat Transfer Measurements for a Horizontal Micro-Tube Using Liquid Crystal-tube and 1000m micro-tube. In the single-phase heat transfer experiments, the fully-developed flow heat transfer were also measured using thermocouples (TC). The results showed that the heat transfer coefficient

  11. Channeling

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield MunicipalTechnical Report:Speeding accessby a contractorEnergy, science, and7451SciTechLoS

  12. Fundamental channeling questions at ultra relativistic energies

    SciTech Connect (OSTI)

    Carrigan, Richard A., Jr.; /Fermilab

    2006-08-01

    TeV-range bent crystal channeling has interesting advantages for several applications at high energy accelerators. Observations of enhanced deflection over the whole arc of a bent crystal at RHIC and recently at the Tevatron may be due to a process called ''volume reflection''. More investigations of volume reflection and of the complimentary process, volume capture, are needed. So-called quasimosaic bending processes also deserve additional study. Negative particle channeling may be relevant to channeling collimation for electron machines. Electron and positron channeling and channeling radiation are interwoven so that the impact of channeling radiation on applications needs to be better understood. Beams in the 0.1 to 1 GeV range may be useful for some of these investigations. Finally there has been little or no study of positive and negative muon channeling. The current understanding of these topics and the desirability of further work is reviewed.

  13. Gas Pressure Effect on Density of Horizontally Aligned Single-Walled Carbon Nanotubes Grown on Crystal Quartz Substrates

    E-Print Network [OSTI]

    Maruyama, Shigeo

    Gas Pressure Effect on Density of Horizontally Aligned Single-Walled Carbon Nanotubes Grown performance FETs. In this study, we examined the effect of gas pressures on the growth process of horizontally grown by alcohol CVD method[5] using ethanol as a carbon source gas at different gas pressures. SWCNTs

  14. Bachaquero-01 reservoir, Venezuela-increasing oil production by switching from cyclic steam injection to steamflooding using horizontal wells 

    E-Print Network [OSTI]

    Rodriguez, Manuel Gregorio

    1999-01-01

    cyclic steam injection and steamflooding. The Cartesian model dimensions of the three horizontal welts were 11x22x4, 11x27x5, and 12x20x5. In the steamflooding scheme investigated, the existing horizontal welts were used as injectors while existing (and...

  15. Estimation of light penetration, and horizontal and vertical visibility in oceanic and coastal waters from surface reflectance

    E-Print Network [OSTI]

    Babin, Marcel

    Estimation of light penetration, and horizontal and vertical visibility in oceanic and coastal penetration, and horizontal and vertical visibility in oceanic and coastal waters from surface reflectance, J. The algorithms are found to be valid both in coastal and oceanic waters, and largely insensitive to regional

  16. Conductive Channel for Energy Transmission

    SciTech Connect (OSTI)

    Apollonov, Victor V. [A.M. Prokhorov General Physics Institute, Vavilov Str. 38, Moscow, 119991 (Russian Federation)

    2011-11-10

    For many years the attempts to create conductive channels of big length were taken in order to study the upper atmosphere and to settle special tasks, related to energy transmission. There upon the program of creation of 'Impulsar' represents a great interest, as this program in a combination with high-voltage high repetition rate electrical source can be useful to solve the above mentioned problems (N. Tesla ideas for the days of high power lasers). The principle of conductive channel production can be shortly described as follows. The 'Impulsar' - laser jet engine vehicle - propulsion take place under the influence of powerful high repetition rate pulse-periodic laser radiation. In the experiments the CO{sub 2}-laser and solid state Nd:YAG laser systems had been used. Active impulse appears thanks to air breakdown (<30 km) or to the breakdown of ablated material on the board (>30 km), placed in the vicinity of the focusing mirror-acceptor of the breakdown waves. With each pulse of powerful laser the device rises up, leaving a bright and dense trace of products with high degree of ionization and metallization by conductive nano-particles due to ablation. Conductive dust plasma properties investigation in our experiments was produced by two very effective approaches: high power laser controlled ablation and by explosion of wire. Experimental and theoretical results of conductive canal modeling will be presented. The estimations show that with already experimentally demonstrated figures of specific thrust impulse the lower layers of the Ionosphere can be reached in several ten seconds that is enough to keep the high level of channel conductivity and stability with the help of high repetition rate high voltage generator. Some possible applications for new technology are highlighted.

  17. Structure of conducting channel of lightning

    SciTech Connect (OSTI)

    Alanakyan, Yu. R.

    2013-08-15

    The spatial distribution of the plasma density in a lightning channel is studied theoretically. It is shown that the electric-field double layer is formed at the channel boundary. In this case, the electron temperature changes abruptly and ions are accelerated by the electric field of the double layer. The ion momentum flux density is close to the surrounding gas pressure. Cleaning of the channel from heavy particles occurs in particle-exchange processes between the plasma channel and the surrounding air. Hydrogen ions are accumulated inside the expanding channel from the surrounding air, which is enriched by hydrogen-contained molecules. In this case, the plasma channel is unstable and splits to a chain of equidistant bunches of plasma. The hydrogen-enrich bunches burn diffusely after recombination exhibiting the bead lightning behavior.

  18. Web-based multi-channel analyzer

    DOE Patents [OSTI]

    Gritzo, Russ E.

    2003-12-23

    The present invention provides an improved multi-channel analyzer designed to conveniently gather, process, and distribute spectrographic pulse data. The multi-channel analyzer may operate on a computer system having memory, a processor, and the capability to connect to a network and to receive digitized spectrographic pulses. The multi-channel analyzer may have a software module integrated with a general-purpose operating system that may receive digitized spectrographic pulses for at least 10,000 pulses per second. The multi-channel analyzer may further have a user-level software module that may receive user-specified controls dictating the operation of the multi-channel analyzer, making the multi-channel analyzer customizable by the end-user. The user-level software may further categorize and conveniently distribute spectrographic pulse data employing non-proprietary, standard communication protocols and formats.

  19. Integrated Approach Towards the Application of Horizontal Wells to Improve Waterflooding Performance

    SciTech Connect (OSTI)

    Kelkar, Mohan; Liner, Chris; Kerr, Dennis

    1999-10-15

    This final report describes the progress during the six year of the project on ''Integrated Approach Towards the Application of Horizontal Wells to Improve Waterflooding Performance.'' This report is funded under the Department of Energy's (DOE's) Class I program which is targeted towards improving the reservoir performance of mature oil fields located in fluvially-dominated deltaic deposits. The project involves using an integrated approach to characterize the reservoir followed by drilling of horizontal injection wells to improve production performance. The project was divided into two budget periods. In the first budget period, many modern technologies were used to develop a detailed reservoir management plan; whereas, in the second budget period, conventional data was used to develop a reservoir management plan. The idea was to determine the cost effectiveness of various technologies in improving the performance of mature oil fields.

  20. Experimental investigation on the slip between oil and water in horizontal pipes

    SciTech Connect (OSTI)

    Xu, Jing-yu; Wu, Ying-xiang; Feng, Fei-fei; Chang, Ying; Li, Dong-hui [Division of Engineering Sciences, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190 (China)

    2008-10-15

    This work is devoted to study of the slip phenomenon between phases in water-oil two-phase flow in horizontal pipes. The emphasis is placed on the effects of input fluids flow rates, pipe diameter and viscosities of oil phase on the slip. Experiments were conducted to measure the holdup in two horizontal pipes with 0.05 m diameter and 0.025 m diameter, respectively, using two different viscosities of white oil and tap water as liquid phases. Results showed that the ratios of in situ oil to water velocity at the pipe of small diameter are higher than those at the pipe of big diameter when having same input flow rates. At low input water flow rate, there is a large deviation on the holdup between two flow systems with different oil viscosities and the deviation becomes gradually smaller with further increased input water flow rate. (author)

  1. Jet-induced 2-D crater formation with horizontal symmetry breaking

    E-Print Network [OSTI]

    Abram H. Clark; Robert P. Behringer

    2013-09-04

    We investigate the formation of a crater in a 2-D bed of granular material by a jet of impinging gas, motivated by the problem of a retrograde rocket landing on a planetary surface. The crater is characterized in terms of depth and shape as it evolves, as well as by the horizontal position of the bottom of the crater. The crater tends to grow logarithmically in time, a result which is common in related experiments. We also observe a horizontal symmetry breaking at certain well-defined conditions which, as we will demonstrate, could be of considerable practical concern for lunar or planetary landers. We present data on the evolution of these asymmetric states and attempt to give insights into the mechanism behind the symmetry-breaking bifurcation.

  2. Flow patterns and cleaning behaviour of stationary horizontal liquid jets impinging on angled walls

    E-Print Network [OSTI]

    Wang, Tao; Davidson, John F.; Wilson, D. Ian

    2014-09-30

    hydraulic jump, has been studied extensively in the fluid mechanics literature (e.g. Watson, 1964), the case of a liquid jet impinging on a vertical wall has received relatively little attention. Morison and Thorpe (2002) reported an experimental... ] where ? is the kinematic viscosity and g sin? is the component of gravitational acceleration acting along the wall. Figure 1 and Equation (1) are written for the general case of a jet inclined to the horizontal striking a non-vertical wall...

  3. Horizontal cryogenic bushing for the termination of a superconducting power-transmission line

    DOE Patents [OSTI]

    Minati, K.F.; Morgan, G.H.; McNerney, A.J.; Schauer, F.

    1982-07-29

    A termination for a superconducting power transmission line is disclosed which is comprised of a standard air entrance insulated vertical bushing with an elbow, a horizontal cryogenic bushing linking the pressurized cryogenic cable environment to the ambient temperature bushing and a stress cone which terminated the cable outer shield and transforms the large radial voltage gradient in the cable dielectric into a much lower radial voltage gradient in the high density helium coolant at the cold end of the cryogenic bushing.

  4. Interpreting Horizontal Well Flow Profiles and Optimizing Well Performance by Downhole Temperature and Pressure Data 

    E-Print Network [OSTI]

    Li, Zhuoyi

    2011-02-22

    . Because of geothermal gradient, formation temperature along the depth of the wellbore changes significantly. At such a situation, some small thermal effects, such as fluid thermal expansion and viscous dissipation heating, can be ignored compared... data. For horizontal wells, because geothermal temperature changes are relatively small, the dominating effects on the wellbore temperature changes may be thermal expansion, viscous dissipative heating, and thermal conduction. Model for temperature...

  5. Termination for a superconducting power transmission line including a horizontal cryogenic bushing

    DOE Patents [OSTI]

    Minati, Kurt F. (Northport, NY); Morgan, Gerry H. (Patchogue, NY); McNerney, Andrew J. (Shoreham, NY); Schauer, Felix (Upton, NY)

    1984-01-01

    A termination for a superconducting power transmission line is disclosed which is comprised of a standard air entrance insulated vertical bushing with an elbow, a horizontal cryogenic bushing linking the pressurized cryogenic cable environment to the ambient temperature bushing and a stress cone which terminates the cable outer shield and transforms the large radial voltage gradient in the cable dielectric into a much lower radial voltage gradient in the high density helium coolant at the cold end of the cryogenic bushing.

  6. Large-Actuator-Number Horizontal Path Correction of Atmospheric Turbulence utilizing an Interferometric Phase Conjugate Engine

    SciTech Connect (OSTI)

    Baker, K L; Stappaerts, E A; Gavel, D; Tucker, J; Silva, D A; Wilks, S C; Olivier, S S; Olsen, J

    2004-08-25

    An adaptive optical system used to correct horizontal beam propagation paths has been demonstrated. This system utilizes an interferometric wave-front sensor and a large-actuator-number MEMS-based spatial light modulator to correct the aberrations incurred by the beam after propagation along the path. Horizontal path correction presents a severe challenge to adaptive optics systems due to the short atmospheric transverse coherence length and the high degree of scintillation incurred by laser propagation along these paths. Unlike wave-front sensors that detect phase gradients, however, the interferometric wave-front sensor measures the wrapped phase directly. Because the system operates with nearly monochromatic light and uses a segmented spatial light modulator, it does not require that the phase be unwrapped to provide a correction and it also does not require a global reconstruction of the wave-front to determine the phase as required by gradient detecting wave-front sensors. As a result, issues with branch points are eliminated. Because the atmospheric probe beam is mixed with a large amplitude reference beam, it can be made to operate in a photon noise limited regime making its performance relatively unaffected by scintillation. The MEMS-based spatial light modulator in the system contains 1024 pixels and is controlled to speeds in excess of 800 Hz, enabling its use for correction of horizontal path beam propagation. In this article results are shown of both atmospheric characterization with the system and open loop horizontal path correction of a 1.53 micron laser by the system. To date Strehl ratios of greater than 0.5 have been achieved.

  7. Increased reserves through horizontal drilling in a mature waterflood, Long Beach unit, Wilmington Oil Field, California

    SciTech Connect (OSTI)

    Berman, B.H.

    1996-12-31

    Ranger Zone development started in 1965. A waterflood was initiated from the start using a staggered line-drive pattern. Infill drilling in the early 1980s and again in the 1990s revealed bypassed oil in the upper Ranger Fo sand. Detailed studies of the aerial extent of the remaining oil resulted in drilling 17 horizontal wells to recover these reserves. The Fo target sand thickness is 20 to 50 feet. Well courses are between 10 and 15 feet below the top of the Fo with lengths varying from 800 to 1,000 feet. The success of the Fo drilling program has prompted expansion of horizontal drilling into thin-bedded sand units. Well lengths have increased to between 1,500 and 1,800 feet with structural trend used to advantage. Where needed, probes are designed to penetrate the target sand before setting intermediate casing. The drilling program has been extended into bilateral horizontal completions. Geosteering with MWD/GR and a 2 MHz dual propagation resistivity tool is used to the casing point. In the completion interval, only the MWD/GR tool is used and a drillpipe conveyed E-log is run afterward to confirm expected resistivities. Despite the many well penetrations in the Ranger Zone, structural control is only fair. Accuracy of MWD data is generally low and geosteering is done by TVD log correlation. With a recovery factor of over 30 percent in Ranger West, from approximately 800 wells drilled in the last 30 years, the horizontal drilling program targeting bypassed reserves has brought new life to this mature reservoir.

  8. Increased reserves through horizontal drilling in a mature waterflood, Long Beach unit, Wilmington Oil Field, California

    SciTech Connect (OSTI)

    Berman, B.H. )

    1996-01-01

    Ranger Zone development started in 1965. A waterflood was initiated from the start using a staggered line-drive pattern. Infill drilling in the early 1980s and again in the 1990s revealed bypassed oil in the upper Ranger Fo sand. Detailed studies of the aerial extent of the remaining oil resulted in drilling 17 horizontal wells to recover these reserves. The Fo target sand thickness is 20 to 50 feet. Well courses are between 10 and 15 feet below the top of the Fo with lengths varying from 800 to 1,000 feet. The success of the Fo drilling program has prompted expansion of horizontal drilling into thin-bedded sand units. Well lengths have increased to between 1,500 and 1,800 feet with structural trend used to advantage. Where needed, probes are designed to penetrate the target sand before setting intermediate casing. The drilling program has been extended into bilateral horizontal completions. Geosteering with MWD/GR and a 2 MHz dual propagation resistivity tool is used to the casing point. In the completion interval, only the MWD/GR tool is used and a drillpipe conveyed E-log is run afterward to confirm expected resistivities. Despite the many well penetrations in the Ranger Zone, structural control is only fair. Accuracy of MWD data is generally low and geosteering is done by TVD log correlation. With a recovery factor of over 30 percent in Ranger West, from approximately 800 wells drilled in the last 30 years, the horizontal drilling program targeting bypassed reserves has brought new life to this mature reservoir.

  9. Entanglement Transmission Capacity of Compound Channels

    E-Print Network [OSTI]

    Igor Bjelakovic; Holger Boche; Janis Noetzel

    2009-04-20

    We determine the optimal achievable rate at which entanglement can be reliably transmitted when the memoryless channel used during transmission is unknown both to sender and receiver. To be more precise, we assume that both of them only know that the channel belongs to a given set of channels. Thus, they have to use encoding and decoding schemes that work well for the whole set.

  10. Method for explosive expansion toward horizontal free faces for forming an in situ oil shale retort

    DOE Patents [OSTI]

    Ricketts, Thomas E. (Bakersfield, CA)

    1980-01-01

    Formation is excavated from within a retort site in formation containing oil shale for forming a plurality of vertically spaced apart voids extending horizontally across different levels of the retort site, leaving a separate zone of unfragmented formation between each pair of adjacent voids. Explosive is placed in each zone, and such explosive is detonated in a single round for forming an in situ retort containing a fragmented permeable mass of formation particles containing oil shale. The same amount of formation is explosively expanded upwardly and downwardly toward each void. A horizontal void excavated at a production level has a smaller horizontal cross-sectional area than a void excavated at a lower level of the retort site immediately above the production level void. Explosive in a first group of vertical blast holes is detonated for explosively expanding formation downwardly toward the lower void, and explosive in a second group of vertical blast holes is detonated in the same round for explosively expanding formation upwardly toward the lower void and downwardly toward the production level void for forming a generally T-shaped bottom of the fragmented mass.

  11. Environmental Measurement-While-Drilling System and Horizontal Directional Drilling Technology Demonstration, Hanford Site

    SciTech Connect (OSTI)

    Williams, C.V.; Lockwood, G.J.; Normann, R.A.; Myers, D.A.; Gardner, M.G.; Williamson, T.; Huffman, J.

    1999-06-01

    The Environmental Measurement-While-Drilling (EMWD) system and Horizontal Directional Drilling (HDD) were successfully demonstrated at the Mock Tank Leak Simulation Site and the Drilling Technology Test Site, Hanford, Washington. The use of directional drilling offers an alternative to vertical drilling site characterization. Directional drilling can develop a borehole under a structure, such as a waste tank, from an angled entry and leveling off to horizontal at the desired depth. The EMWD system represents an innovative blend of new and existing technology that provides the capability of producing real-time environmental and drill bit data during drilling operations. The technology demonstration consisted of the development of one borehole under a mock waste tank at a depth of {approximately} {minus}8 m ({minus}27 ft.), following a predetermined drill path, tracking the drill path to within a radius of {approximately}1.5 m (5 ft.), and monitoring for zones of radiological activity using the EMWD system. The purpose of the second borehole was to demonstrate the capability of drilling to a depth of {approximately} {minus}21 m ({minus}70 ft.), the depth needed to obtain access under the Hanford waste tanks, and continue drilling horizontally. This report presents information on the HDD and EMWD technologies, demonstration design, results of the demonstrations, and lessons learned.

  12. Measurement and modeling of solar irradiance components on horizontal and tilted planes

    SciTech Connect (OSTI)

    Padovan, Andrea; Col, Davide del

    2010-12-15

    In this work new measurements of global and diffuse solar irradiance on the horizontal plane and global irradiance on planes tilted at 20 and 30 oriented due South and at 45 and 65 oriented due East are used to discuss the modeling of solar radiation. Irradiance data are collected in Padova (45.4 N, 11.9 E, 12 m above sea level), Italy. Some diffuse fraction correlations have been selected to model the hourly diffuse radiation on the horizontal plane. The comparison with the present experimental data shows that their prediction accuracy strongly depends on the sky characteristics. The hourly irradiance measurements taken on the tilted planes are compared with the estimations given by one isotropic and three anisotropic transposition models. The use of an anisotropic model, based on a physical description of the diffuse radiation, provides a much better accuracy, especially when measurements of the diffuse irradiance on the horizontal plane are not available and thus transposition models have to be applied in combination with a diffuse fraction correlation. This is particularly significant for the planes oriented away from South. (author)

  13. Channeling collimation studies at the Fermilab Tevatron

    SciTech Connect (OSTI)

    Carrigan, Richard A.; Drozhdin, Alexandr I.; Fliller, Raymond P., III; Mokhov, Nikolai V.; Shiltsev, Vladimir D.; Still, Dean A.; /Fermilab

    2006-08-01

    Bent crystal channeling has promising advantages for accelerator beam collimation at high energy hadron facilities such as the LHC. This significance has been amplified by several surprising developments including multi-pass channeling and the observation of enhanced deflections over the entire arc of a bent crystal. The second effect has been observed both at RHIC and recently at the Tevatron. Results are reported showing channeling collimation of the circulating proton beam halo at the Tevatron. Parenthetically, this study is the highest energy proton channeling experiment ever carried out. The study is continuing.

  14. Spontaneous Formation of Biomimetic, Nanoporous Membrane Channels...

    Office of Science (SC) Website

    of porins (protein-based biological channels), such as selective transport of protons, water, ions, and small molecules. The Impact The predictive design and creation of robust...

  15. Coding and detection for 2-dimensional channels

    E-Print Network [OSTI]

    Demirkan, ?smail

    2006-01-01

    Systems Two-dimensional Storage Systems Channel Modeling andOF FIGURES A typical storage system. Acronym MC stands forfor holographic storage systems. . . . . . . Discrete-time

  16. Southern California Channel Islands Bibliography, through 1992

    E-Print Network [OSTI]

    Channel Islands National Marine Sanctuary

    1992-01-01

    Channel/Santa Maria Basin/Elk Hills/San Joaquin Basin/Chicosiliceous composition/Elk Hills/San Joaquin Basin/Chico

  17. Anais XI SBSR, Belo Horizonte, Brasil, 05 -10 abril 2003, INPE, p. 2193 -2200. MAPSAR: A NEW L-BAND SPACEBORNE SAR MISSION FOR ASSESSMENT

    E-Print Network [OSTI]

    Anais XI SBSR, Belo Horizonte, Brasil, 05 - 10 abril 2003, INPE, p. 2193 - 2200. 2193 MAPSAR: A NEW the 9 7 38 4 #12;Anais XI SBSR, Belo Horizonte, Brasil, 05 - 10 abril 2003, INPE, p. 2193 - 2200. 2194

  18. Unmanned airborne vehicle (UAV): Flight testing and evaluation of two-channel E-field very low frequency (VLF) instrument

    SciTech Connect (OSTI)

    1998-12-01

    Using VLF frequencies, transmitted by the Navy`s network, for airborne remote sensing of the earth`s electrical, magnetic characteristics was first considered by the United States Geological Survey (USGS) around the mid 1970s. The first VLF system was designed and developed by the USGS for installation and operation on a single engine, fixed wing aircraft used by the Branch of Geophysics for geophysical surveying. The system consisted of five channels. Two E-field channels with sensors consisting of a fixed vertical loaded dipole antenna with pre-amp mounted on top of the fuselage and a gyro stabilized horizontal loaded dipole antenna with pre-amp mounted on a tail boom. The three channel magnetic sensor consisted of three orthogonal coils mounted on the same gyro stabilized platform as the horizontal E-field antenna. The main features of the VLF receiver were: narrow band-width frequency selection using crystal filters, phase shifters for zeroing out system phase variances, phase-lock loops for generating real and quadrature gates, and synchronous detectors for generating real and quadrature outputs. In the mid 1990s the Branch of Geophysics designed and developed a two-channel E-field ground portable VLF system. The system was built using state-of-the-art circuit components and new concepts in circuit architecture. Small size, light weight, low power, durability, and reliability were key considerations in the design of the instrument. The primary purpose of the instrument was for collecting VLF data during ground surveys over small grid areas. Later the system was modified for installation on a Unmanned Airborne Vehicle (UAV). A series of three field trips were made to Easton, Maryland for testing and evaluating the system performance.

  19. Geometric pumping in autophoretic channels

    E-Print Network [OSTI]

    Michelin, Sébastien; Montenegro-Johnson, Thomas D.; De Canio, Gabriele; Lobato- Dauzier, Nicolas; Lauga, Eric

    2015-05-07

    ’s function for Laplace’s equation, Eq. (4), is given by ?(x,y;? ,?) = 1 4pi ? ? n=?? ln [ (x?? +2npi)2+(y??)2 ] = 1 4pi ln[2(cosh(y??)? cos(x?? ))]. (7) Assuming that the channel walls are smooth, the concentration at a point (x,y) on one of the walls can... of the top wall, ? , in the cases a/H = 1/2, L/H = 2pi and 0 ? ? ? pi . The four red dots correspond to the different panels illustrated in Figure 3. for K = 12 ln [2cosh(yˆ)?2cos(xˆ)]. The computational pro- cedure for discretizing the domain boundary...

  20. Performance of Fractured Horizontal Wells in High-Permeability Reservoirs P. Valk, SPE and M. J. Economides, SPE, Texas A&M University

    E-Print Network [OSTI]

    Valkó, Peter

    dimensionless conductivity hydraulic fractures. The possibility of fracturing horizontal wells longitudinallySPE 31149 Performance of Fractured Horizontal Wells in High-Permeability Reservoirs P. Valkó, SPE-214-952-9435. Abstract Two of the most important recent developments in petroleum production are horizontal wells

  1. Partially Overlapped Channel Assignment for Multi-Channel Wireless Mesh Networks

    E-Print Network [OSTI]

    Wong, Vincent

    -WMN) consists of a number of stationary wireless routers, forming a multi-hop wireless backbone. Each router channel in the IEEE 802.11a/b/g bands. The wireless mesh routers serve as access points for wirelessPartially Overlapped Channel Assignment for Multi-Channel Wireless Mesh Networks A. Hamed Mohsenian

  2. The Implications of Horizontal and Complete Dam Removals on the Downstream Channel Bed Joanna Crowe Curran (curran@virginia.edu) and Kristen Cannatelli

    E-Print Network [OSTI]

    Curran, Joanna C.

    Curran (curran@virginia.edu) and Kristen Cannatelli Department of Civil and Environmental Engineering

  3. Fourier transform channeled spectropolarimetry in the MWIR

    E-Print Network [OSTI]

    Dereniak, Eustace L.

    Fourier transform channeled spectropolarimetry in the MWIR Michael W. Kudenov,1 Nathan A. Hagen, 1 Abstract: A complete Fourier Transform Spectropolarimeter in the MWIR is demonstrated. The channeled and links 1. P. Griffiths and J. D. Haseth, "Fourier Transform Infrared Spectrometry," (John Wiley & Sons

  4. Energy Harvesting Diamond Channel with Energy Cooperation

    E-Print Network [OSTI]

    Ulukus, Sennur

    Energy Harvesting Diamond Channel with Energy Cooperation Berk Gurakan Sennur Ulukus Department@umd.edu Abstract--We consider the energy harvesting diamond channel, where the source and two relays harvest energy the option of wirelessly transferring some of its energy to the relays via energy cooperation. We find

  5. Lithographically Patterned Channels Spatially Segregate Kinesin Motor

    E-Print Network [OSTI]

    Hancock, William O.

    Lithographically Patterned Channels Spatially Segregate Kinesin Motor Activity and Effectively Received March 25, 2003 ABSTRACT To extract useful work from biological motor proteins, it is necessary microfabrication to construct 1.5-µm-deep channels in SU-8 photoresist patterned on glass. Although motor proteins

  6. 5G Millimeter Wave Channel Model Alliance

    E-Print Network [OSTI]

    5G Millimeter Wave Channel Model Alliance There is an industry and research community need Alliance of companies, academia, and government organizations to support the development of more accurate, consis- tent, and predictive channel models. To facilitate the formation of this Alliance, NIST plans

  7. Screen and slotted liner horizontal completion: : correcting for wellbore pressure drop in the inflow performance relationships (IPR) 

    E-Print Network [OSTI]

    Agbongiator, Eddie Osarenmwida

    2002-01-01

    Error (P.E.) correlation. The correlation, which was simplified using the Table Curve program, is a function of horizontal well length, viscosity, well diameter, wellbore roughness, and production rate. The validation of two commonly used...

  8. Tangent length and sight distance effects on accident rates at horizontal curves on two-lane rural highways 

    E-Print Network [OSTI]

    Fink, Kenneth Lee

    1993-01-01

    This thesis documents an evaluation of the relationships between accident rates at horizontal curves and preceding tangent length and sight distance. Data collection and statistical methods used to evaluate this relationship are presented. A base...

  9. Dynamics of a horizontal cylinder oscillating as a wave energy converter about an off-centred axis. 

    E-Print Network [OSTI]

    Lucas, Jorge

    2011-11-22

    The hydrodynamic properties of a horizontal cylinder which is free to pitch about an off-centred axis are studied and used to derive the equations of motion of a wave energy converter which extracts energy from incoming ...

  10. Study of Flow Regimes in Multiply-Fractured Horizontal Wells in Tight Gas and Shale Gas Reservoir Systems 

    E-Print Network [OSTI]

    Freeman, Craig M.

    2010-07-14

    Various analytical, semi-analytical, and empirical models have been proposed to characterize rate and pressure behavior as a function of time in tight/shale gas systems featuring a horizontal well with multiple hydraulic fractures. Despite a small...

  11. Single Sub-20 nm Wide, Centimeter-Long Nanofluidic Channel

    E-Print Network [OSTI]

    Single Sub-20 nm Wide, Centimeter-Long Nanofluidic Channel Fabricated by Novel Nanoimprint Mold an imprint mold of a channel pattern and nanoimprint to duplicate such channel. The centimeter-long channel without additional size shrinking.17 Single channels have been fabricated by using edge patterning18 (note

  12. Application of horizontal drilling in the development of a complex turbidite sandstone reservoir, Elk Hills Field, Kern County, California

    SciTech Connect (OSTI)

    Reid, S.A. (Bechtel Petroleum Operations, Inc., Tupman, CA (USA)); McJannet, G.S. (Dept. of Energy, Tupman, CA (USA)); Hart, O.D. (Chevron Inc., Tupman, CA (USA))

    1990-05-01

    Horizontal drilling techniques have been used at the Elk Hills field, to more effectively produce the complex 26R reservoir. This Stevens zone reservoir of the Miocene Monterey Formation contains turbid sediments deposited in a deep-sea fan setting and consists of several distinct sandstone layers averaging 150 ft thick and usually separated by mudstone beds. Layers in the reservoir dip as much as 50{degree} southwest. An expanding gas cap makes many vertical wells less favorable to operate. Horizontal completions were thought ideal for the pool because (1) original oil-water contact is level and believed stable, (2) water production is low, (3) a horizontal well provides for a long production life; and (4) several sandstone layers can be produced through one well. For the first well, the plan was to redrill an idle well to horizontal along an arc with a radius of 350 ft. The horizontal section was to be up to 1,000 ft long and extend northeast slightly oblique to dip just above the average oil-water contact. The well was drilled in September 1988, reached horizontal nearly as planned, was completed after perforating 210 ft of oil sand, and produced a daily average of 1,000 bbl oil and 8 bbl of water. However, structural influence was stronger than expected, causing the horizontal drill path to turn directly updip away from the bottom-hole target area. The well also encountered variable oil-water contacts, with more than half the horizontal section possibly water productive. Geologic and drilling data from the first well were used for planning another well. This well was drilled in October 1989, and was highly successful with over 1,000 ft of productive interval.

  13. Distribution of air-water mixtures in parallel vertical channels as an effect of the header geometry

    SciTech Connect (OSTI)

    Marchitto, Annalisa; Fossa, Marco; Guglielmini, Giovanni

    2009-07-15

    Uneven phase distribution in heat exchangers is a cause of severe reductions in thermal performances of refrigeration equipment. To date, no general design rules are available to avoid phase separation in manifolds with several outlet channels, and even predicting the phase and mass distribution in parallel channels is a demanding task. In the present paper, measurements of two-phase air-water distributions are reported with reference to a horizontal header supplying 16 vertical upward channels. The effects of the operating conditions, the header geometry and the inlet port nozzle were investigated in the ranges of liquid and gas superficial velocities of 0.2-1.2 and 1.5-16.5 m/s, respectively. Among the fitting devices used, the insertion of a co-axial, multi-hole distributor inside the header confirmed the possibility of greatly improving the liquid and gas flow distribution by the proper selection of position, diameter and number of the flow openings between the supplying distributor and the system of parallel channels connected to the header. (author)

  14. Applicability of petroleum horizontal drilling technology to hazardous waste site characterization and remediation

    SciTech Connect (OSTI)

    Goranson, C.

    1992-09-01

    Horizontal wells have the potential to become an important tool for use in characterization, remediation and monitoring operations at hazardous waste disposal, chemical manufacturing, refining and other sites where subsurface pollution may develop from operations or spills. Subsurface pollution of groundwater aquifers can occur at these sites by leakage of surface disposal ponds, surface storage tanks, underground storage tanks (UST), subsurface pipelines or leakage from surface operations. Characterization and remediation of aquifers at or near these sites requires drilling operations that are typically shallow, less than 500-feet in depth. Due to the shallow nature of polluted aquifers, waste site subsurface geologic formations frequently consist of unconsolidated materials. Fractured, jointed and/or layered high compressive strength formations or compacted caliche type formations can also be encountered. Some formations are unsaturated and have pore spaces that are only partially filled with water. Completely saturated underpressured aquifers may be encountered in areas where the static ground water levels are well below the ground surface. Each of these subsurface conditions can complicate the drilling and completion of wells needed for monitoring, characterization and remediation activities. This report describes some of the equipment that is available from petroleum drilling operations that has direct application to groundwater characterization and remediation activities. A brief discussion of petroleum directional and horizontal well drilling methodologies is given to allow the reader to gain an understanding of the equipment needed to drill and complete horizontal wells. Equipment used in river crossing drilling technology is also discussed. The final portion of this report is a description of the drilling equipment available and how it can be applied to groundwater characterization and remediation activities.

  15. Security camera resolution measurements: Horizontal TV lines versus modulation transfer function measurements.

    SciTech Connect (OSTI)

    Birch, Gabriel Carisle; Griffin, John Clark

    2015-01-01

    The horizontal television lines (HTVL) metric has been the primary quantity used by division 6000 related to camera resolution for high consequence security systems. This document shows HTVL measurements are fundamen- tally insufficient as a metric to determine camera resolution, and propose a quantitative, standards based methodology by measuring the camera system modulation transfer function (MTF), the most common and accepted metric of res- olution in the optical science community. Because HTVL calculations are easily misinterpreted or poorly defined, we present several scenarios in which HTVL is frequently reported, and discuss their problems. The MTF metric is discussed, and scenarios are presented with calculations showing the application of such a metric.

  16. Vertical and horizontal test results of 3.9-GHz accelerating cavities at FNAL

    SciTech Connect (OSTI)

    Khabiboulline, T.; Edwards, H.; Foley, M.; Harms, E.; Hocker, James Andrew; Mitchell, D.; Rowe, A.; Solyak, N.; /Fermilab

    2008-06-01

    The 3rd harmonic 3.9GHz accelerating cavity was proposed to improve the beam performance of the VUV FEL, FLASH. In the frame of a collaborative agreement, Fermilab will provide DESY with a cryomodule containing a string of four cavities. Seven 9-cell Nb cavities were tested and six of them did reach accelerating gradient up to 24 MV/m almost twice more than design value of 14 MV/m. Two of these cavities are with new HOM couplers with improved design. In this paper we present all results of the vertical and horizontal tests.

  17. Horizontal slim-hole drilling with coiled tubing; An operator's experience

    SciTech Connect (OSTI)

    Ramos, A.B. Jr.; Faahel, R.A.; Chaffin, M.G.; Pulis, K.H. )

    1992-10-01

    What is believed to be the first horizontal well drilled with directionally controlled coiled tubing recently was completed in the Austin Chalk formation. an existing well was sidetracked out of 4 1/2-in. casing with a conventional whipstock. an average build rate of 15[degrees]/100 ft was achieved in the curve, and a 1,458-ft vertical section was drilled with 2-in. coiled tubing, downhole mud motors, wireline steering tools, a mechanical downhole orienting tool, and 3 7/8-in. bits. This paper discusses the orienting and directional tools and techniques developed during this operation. It also describes improvements made for the second well.

  18. Dynamics of a drop trapped inside a horizontal circular hydraulic jump

    E-Print Network [OSTI]

    Duchesne, Alexis; Lebon, Luc; Pirat, Christophe; Limat, Laurent

    2013-01-01

    A drop of moderate size deposited inside a horizontal circular hydraulic jump of the same liquid remains trapped at the shock front and does not coalesce. In this situation the drop is moving along the jump and one observes two different motions: a periodic one (it orbitates at constant speed) and an irregular one involving reversals of the orbital motion. Modeling the drop as a rigid sphere exchanging friction with liquid across a thin film of air, we recover the orbital motion and the internal rotation of the drop. This internal rotation is experimentally observed.

  19. Orbits and reversals of a drop rolling inside a horizontal circular hydraulic jump

    E-Print Network [OSTI]

    Alexis Duchesne; Clément Savaro; Luc Lebon; Christophe Pirat; Laurent Limat

    2013-02-14

    We explore the complex dynamics of a non-coalescing drop of moderate size inside a circular hydraulic jump of the same liquid formed on a horizontal disk. In this situation the drop is moving along the jump and one observes two different motions: a periodic one (it orbitates at constant speed) and an irregular one involving reversals of the orbital motion. Modeling the drop as a rigid sphere exchanging friction with liquid across a thin film of air, we recover the orbital motion and the internal rotation of the drop. This internal rotation is experimentally observed.

  20. Thoughts on Incorporating HPRF in a Linear Cooling Channel

    E-Print Network [OSTI]

    Gallardo, Juan C.

    2010-01-01

    International Muon Ionization Cooling Experiment (MICE), in.of using HPRF in a linear cooling channel. A hybrid channelHPRF In A Linear Cooling Channel Juan C. Gallardo a and

  1. DECODING LDPC CODES OVER BINARY CHANNELS WITH ADDITIVE MARKOV NOISE

    E-Print Network [OSTI]

    Alajaji, Fady

    ) for the case of memoryless channels and is similar to the one developed for the Gilbert­ Elliot channel [2, 3 the Gilbert­Elliot Channel (GEC) [5]. These chan­ nel models are simple and widely used, but they have

  2. Hydraulic and slurry flows through a channel contraction

    E-Print Network [OSTI]

    Al Hanbali, Ahmad

    Hydraulic and slurry flows through a channel contraction Onno Bokhove o, Twente #12;Hydraulic flow through channel contraction Outline · 1. Introduction · 2. Experiments · 3. Conclusions · References ISSF 2008 University of Twente Page 2 #12;Hydraulic flow through channel contraction

  3. Heat transfer and pressure drop of supercritical carbon dioxide flowing in several printed circuit heat exchanger channel patterns

    SciTech Connect (OSTI)

    Carlson, M. [Univ. of Wisconsin - Madison, 839 Engineering Research Building, 1500 Engineering Drive, Madison, WI 53706 (United States); Kruizenga, A. [Sandia National Laboratory (United States); Anderson, M.; Corradini, M. [Univ. of Wisconsin - Madison, 839 Engineering Research Building, 1500 Engineering Drive, Madison, WI 53706 (United States)

    2012-07-01

    Closed-loop Brayton cycles using supercritical carbon dioxide (SCO{sub 2}) show potential for use in high-temperature power generation applications including High Temperature Gas Reactors (HTGR) and Sodium-Cooled Fast Reactors (SFR). Compared to Rankine cycles SCO{sub 2} Brayton cycles offer similar or improved efficiency and the potential for decreased capital costs due to a reduction in equipment size and complexity. Compact printed-circuit heat exchangers (PCHE) are being considered as part of several SCO{sub 2} Brayton designs to further reduce equipment size with increased energy density. Several designs plan to use a gas cooler operating near the pseudo-critical point of carbon dioxide to benefit from large variations in thermophysical properties, but further work is needed to validate correlations for heat transfer and pressure-drop characteristics of SCO{sub 2} flows in candidate PCHE channel designs for a variety of operating conditions. This paper presents work on experimental measurements of the heat transfer and pressure drop behavior of miniature channels using carbon dioxide at supercritical pressure. Results from several plate geometries tested in horizontal cooling-mode flow are presented, including a straight semi-circular channel, zigzag channel with a bend angle of 80 degrees, and a channel with a staggered array of extruded airfoil pillars modeled after a NACA 0020 airfoil with an 8.1 mm chord length facing into the flow. Heat transfer coefficients and bulk temperatures are calculated from measured local wall temperatures and local heat fluxes. The experimental results are compared to several methods for estimating the friction factor and Nusselt number of cooling-mode flows at supercritical pressures in millimeter-scale channels. (authors)

  4. Solution to time-energy costs of quantum channels

    E-Print Network [OSTI]

    Chi-Hang Fred Fung; H. F. Chau; Chi-Kwong Li; Nung-Sing Sze

    2014-12-16

    We derive a formula for the time-energy costs of general quantum channels proposed in [Phys. Rev. A 88, 012307 (2013)]. This formula allows us to numerically find the time-energy cost of any quantum channel using positive semidefinite programming. We also derive a lower bound to the time-energy cost for any channels and the exact the time-energy cost for a class of channels which includes the qudit depolarizing channels and projector channels as special cases.

  5. Coupled-channel scattering on a torus

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Guo, Peng; Dudek, Jozef Jon; Edwards, Robert G.; Szczepaniak, Adam Pawel

    2013-07-01

    Based on the Hamiltonian formalism approach, a generalized Luscher's formula for two particle scattering in both the elastic and coupled-channel cases in moving frames is derived from a relativistic Lippmann-Schwinger equation. Some strategies for extracting scattering amplitudes for a coupled-channel system from the discrete finite-volume spectrum are discussed and illustrated with a toy model of two-channel resonant scattering. This formalism will, in the near future, be used to extract information about hadron scattering from lattice QCD computations.

  6. Multi-channel polarized thermal emitter

    DOE Patents [OSTI]

    Lee, Jae-Hwang; Ho, Kai-Ming; Constant, Kristen P

    2013-07-16

    A multi-channel polarized thermal emitter (PTE) is presented. The multi-channel PTE can emit polarized thermal radiation without using a polarizer at normal emergence. The multi-channel PTE consists of two layers of metallic gratings on a monolithic and homogeneous metallic plate. It can be fabricated by a low-cost soft lithography technique called two-polymer microtransfer molding. The spectral positions of the mid-infrared (MIR) radiation peaks can be tuned by changing the periodicity of the gratings and the spectral separation between peaks are tuned by changing the mutual angle between the orientations of the two gratings.

  7. Channels and jokers in continuous systems

    SciTech Connect (OSTI)

    Butkovskii, O. Ya., E-mail: olegb@vlsu.ru; Logunov, M. Yu. [Vladimir State University (Russian Federation)

    2007-06-15

    The Roessler system is used as an example to demonstrate that the reconstruction of a model nonlinear dynamical system from an observed time series reveals phase-space regions called channels and jokers [3]. The proposed method for finding such regions is shown to be robust to noise and inaccuracy (redundancy) of the models used in the reconstruction procedure. The evolution of local Lyapunov exponents of attractors is examined for the model systems, and its relation to channels and jokers is exposed. It is shown that channels and jokers can be used in predictive modeling. The quality of such models is analyzed by invoking the concept of degree of predictability.

  8. TWO-CHANNEL DIELECTRIC WAKE FIELD ACCELERATOR

    SciTech Connect (OSTI)

    Jay L. Hirshfield

    2012-05-30

    Experimental results are reported for test beam acceleration and deflection in a two-channel, cm-scale, rectangular dielectric-lined wakefield accelerator structure energized by a 14-MeV drive beam. The dominant waveguide mode of the structure is at {approx}30 GHz, and the structure is configured to exhibit a high transformer ratio ({approx}12:1). Accelerated bunches in the narrow secondary channel of the structure are continuously energized via Cherenkov radiation that is emitted by a drive bunch moving in the wider primary channel. Observed energy gains and losses, transverse deflections, and changes in the test bunch charge distribution compare favorably with predictions of theory.

  9. Modeling Feat Sheds Light on Protein Channel's Function

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

    translocon channel (green), which is embedded in the cell membrane (yellow, white). Proteins that are inserted via the ribosome into the channel can either be laterally...

  10. Demonstration of Eastman Christensen horizontal drilling system -- Integrated Demonstration Site, Savannah River Site

    SciTech Connect (OSTI)

    Not Available

    1992-12-01

    An innovative horizontal drilling system was used to install two horizontal wells as part of an integrated demonstration project at the Savannah River Site (SRS), Aiken, South Carolina. The SRS is located in south-central South Carolina in the upper Coastal Plain physiographic province. The demonstration site is located near the A/M Area, and is currently known as the Integated Demonstration Site. The Department of Energy's Office of Technology Development initiated an integrated demonstration of innovative technologies for cleanup of volatile organic compounds (VOCS) in soils and groundwater at the SRS in 1989. The overall goal of the program is to demonstrate, at a single location, multiple technologies in the fields of drilling, characterization, monitoring, and remediation. Innovative technologies are compared to one another and to baseline technologies in terms of technical performance and cost effectiveness. Transfer of successfully demonstrated technologies and systems to DOE environmental restoration organizations, to other government agencies, and to industry is a critical part of the program.

  11. Demonstration of Eastman Christensen horizontal drilling system -- Integrated Demonstration Site, Savannah River Site

    SciTech Connect (OSTI)

    Not Available

    1992-12-01

    An innovative horizontal drilling system was used to install two horizontal wells as part of an integrated demonstration project at the Savannah River Site (SRS), Aiken, South Carolina. The SRS is located in south-central South Carolina in the upper Coastal Plain physiographic province. The demonstration site is located near the A/M Area, and is currently known as the Integated Demonstration Site. The Department of Energy`s Office of Technology Development initiated an integrated demonstration of innovative technologies for cleanup of volatile organic compounds (VOCS) in soils and groundwater at the SRS in 1989. The overall goal of the program is to demonstrate, at a single location, multiple technologies in the fields of drilling, characterization, monitoring, and remediation. Innovative technologies are compared to one another and to baseline technologies in terms of technical performance and cost effectiveness. Transfer of successfully demonstrated technologies and systems to DOE environmental restoration organizations, to other government agencies, and to industry is a critical part of the program.

  12. Interlaboratory comparison of the horizontal pipe insulation test apparatus up to 350{degrees}C

    SciTech Connect (OSTI)

    Whitaker, T.E. [Pabco, Fruita, CO (United States); Graves, R.S. [Oak Ridge National Lab., TN (United States); McElroy, D.L. [McElroy (David L.), Knoxville, TN (United States); Smith, D.R. [National Institute of Standards and Technology, Boulder, CO (United States)

    1993-12-01

    The purpose of this interlaboratory comparison was to provide information for the precision and bias section in the ASTM Standard Test Method C 335, {open_quotes}Steady-State Heat Transfer Properties of Horizontal Pipe Insulation.{close_quotes} (The text describes the ASTM C 335 test method, the specimens tested and the test protocol). The apparent thermal conductivity of two rigid calcium silicate pipe insulation specimens was measured by eight laboratories. Each laboratory measured both specimens at four different temperatures. The test mean temperatures ranged from 35 to 390{degrees}C. The two standard deviation value for the data ranged from 4.5 to 7.7% and the average value was 6.3%. The statement recommended for the precision and bias statement for Section 13.1.4 of ASTM C 335 is: {open_quotes}Tests performed at seven different laboratories using guarded-end horizontal pipe test apparatus and at one laboratory using an unguarded cylindrical screen test apparatus on two specimens of calcium silicate insulation in the range of mean temperatures from 35 to 390{degree}C did not vary by more than 6.3% (two standard deviations) of the average.{close_quotes}

  13. Advanced Horizontal Well Recirculation Systems for Geothermal Energy Recovery in Sedimentary and Crystalline Formations

    SciTech Connect (OSTI)

    Bruno, Mike S.; Detwiler, Russell L.; Lao, Kang; Serajian, Vahid; Elkhoury, Jean; Diessl, Julia; White, Nicky

    2012-12-13

    There is increased recognition that geothermal energy resources are more widespread than previously thought, with potential for providing a significant amount of sustainable clean energy worldwide. Recent advances in drilling, completion, and production technology from the oil and gas industry can now be applied to unlock vast new geothermal resources, with some estimates for potential electricity generation from geothermal energy now on the order of 2 million megawatts. The primary objectives of this DOE research effort are to develop and document optimum design configurations and operating practices to produce geothermal power from hot permeable sedimentary and crystalline formations using advanced horizontal well recirculation systems. During Phase I of this research project Terralog Technologies USA and The University of California, Irvine (UCI), have completed preliminary investigations and documentation of advanced design concepts for paired horizontal well recirculation systems, optimally configured for geothermal energy recovery in permeable sedimentary and crystalline formations of varying structure and material properties. We have also identified significant geologic resources appropriate for application of such technology. The main challenge for such recirculation systems is to optimize both the design configuration and the operating practices for cost-effective geothermal energy recovery. These will be strongly influenced by sedimentary formation properties, including thickness and dip, temperature, thermal conductivity, heat capacity, permeability, and porosity; and by working fluid properties.

  14. An Alternative To The Horizontality Condition In Superfield Approach To BRST Symmetries

    E-Print Network [OSTI]

    R. P. Malik

    2007-07-12

    We provide an alternative to the gauge covariant horizontality condition which is responsible for the derivation of the nilpotent (anti-)BRST symmetry transformations for the gauge and (anti-)ghost fields of a (3 + 1)-dimensional (4D) interacting 1-form non-Abelian gauge theory in the framework of the usual superfield approach to Becchi-Rouet-Stora-Tyutin (BRST) formalism. The above covariant horizontality condition is replaced by a gauge invariant restriction on the (4, 2)-dimensional supermanifold, parameterized by a set of four spacetime coordinates x^\\mu (\\mu = 0, 1, 2, 3) and a pair of Grassmannian variables \\theta and \\bar\\theta. The latter condition enables us to derive the nilpotent (anti-)BRST symmetry transformations for all the fields of an interacting 4D 1-form non-Abelian gauge theory where there is an explicit coupling between the gauge field and the Dirac fields. The key differences and striking similarities between the above two conditions are pointed out clearly.

  15. Horizontal gene transfer and the evolution of transcriptionalregulation in Escherichia coli

    SciTech Connect (OSTI)

    Price, Morgan N.; Dehal, Paramvir S.; Arkin, Adam P.

    2007-12-20

    Background: Most bacterial genes were acquired by horizontalgene transfer from other bacteria instead of being inherited bycontinuous vertical descent from an ancient ancestor}. To understand howthe regulation of these {acquired} genes evolved, we examined theevolutionary histories of transcription factors and of regulatoryinteractions from the model bacterium Escherichia coli K12. Results:Although most transcription factors have paralogs, these usually arose byhorizontal gene transfer rather than by duplication within the E. colilineage, as previously believed. In general, most neighbor regulators --regulators that are adjacent to genes that they regulate -- were acquiredby horizontal gene transfer, while most global regulators evolvedvertically within the gamma-Proteobacteria. Neighbor regulators wereoften acquired together with the adjacent operon that they regulate, sothe proximity might be maintained by repeated transfers (like "selfishoperons"). Many of the as-yet-uncharacterized (putative) regulators havealso been acquired together with adjacent genes, so we predict that theseare neighbor regulators as well. When we analyzed the histories ofregulatory interactions, we found that the evolution of regulation byduplication was rare, and surprisingly, many of the regulatoryinteractions that are shared between paralogs result from convergentevolution. Another surprise was that horizontally transferred genes aremore likely than other genes to be regulated by multiple regulators, andmost of this complex regulation probably evolved after the transfer.Conclusions: Our results highlight the rapid evolution of niche-specificgene regulation in bacteria.

  16. Recovery of bypassed oil in the Dundee Formation using horizontal drains. Quarterly report, October 1 - December 31, 1996

    SciTech Connect (OSTI)

    Wood, J.R.

    1997-01-01

    The principal objective of this project is to demonstrate the feasibility and economic success of producing oil from abandoned or nearly abandoned fields in the Dundee Formation of Central Michigan using horizontal drilling technology. A site for a horizontal well was selected in Crystal Field, a nearly-abandoned Dundee oil field in Michigan. This field had produced over 8 million barrels of oil, mostly in the 1930`s and 1940`s. At the height of development, Crystal Field produced from 193 wells, but by 1995, only seven producing wells remained, each producing less than 10 bbls/day. A horizontal well was drilled as a field demonstration pilot, funded through this DOE project, and was successful. It has produced over 37,000 bbls of oil as of December 31, 1996 at sustained rate of {approximately}100 bbls/day. At a nominal wellhead price of $20/bbl, this well has made about $750,000 and is still going strong. Two additional horizontal wells have just been completed and are on test. Core and logs from the Dundee interval were recovered from a vertical borehole at the same surface location. The horizontal well was brought on production at a rate of 100 bbls/day and is probably capable of producing at a higher rate. The addition of several horizontal wells, similar to the demonstration well, will likely add another 2 million bbls (or more) to the cumulative production of the field over the next few years. The presence of untapped oil in this Dundee field was dramatically demonstrated and the favorable economics were made clearly evident. If other abandoned Dundee fields are re-developed in a similar manner, the additional oil produced could exceed 80 million barrels. Horizontal drilling will likely revolutionize the development of old carbonate fields such as those in the Dundee of Michigan.

  17. Along channel distance [km] Salinity [psu

    E-Print Network [OSTI]

    at estuaries that have already seen the effects of tectonically induced sea level rise, scientists have been -- that is the upper intertidal mudflats and salt marsh edge -- while the decreased drag on the channel bed leads

  18. Scripps Channel 2 | Open Energy Information

    Open Energy Info (EERE)

    Co-located facilities 10.5m Salt Water Deep TankFlume2nd Wave ChannelPressure Test VesselsTemperature-Pressure Calibration Facility Specializations, Capabilities, and Key...

  19. Message passing with queues and channels

    SciTech Connect (OSTI)

    Dozsa, Gabor J; Heidelberger, Philip; Kumar, Sameer; Ratterman, Joseph D; Steinmacher-Burow, Burkhard; Wisniewski, Robert W

    2013-09-24

    In an embodiment, a send thread receives an identifier that identifies a destination node and a pointer to data. The send thread creates a first send request in response to the receipt of the identifier and the data pointer. The send thread selects a selected channel from among a plurality of channels. The selected channel comprises a selected hand-off queue and an identification of a selected message unit. Each of the channels identifies a different message unit. The selected hand-off queue is randomly accessible. If the selected hand-off queue contains an available entry, the send thread adds the first send request to the selected hand-off queue. If the selected hand-off queue does not contain an available entry, the send thread removes a second send request from the selected hand-off queue and sends the second send request to the selected message unit.

  20. On the capacity of bosonic channels

    E-Print Network [OSTI]

    Blake, Christopher Graham

    2011-01-01

    The capacity of the bosonic channel with additive Gaussian noise is unknown, but there is a known lower bound that is conjectured to be the capacity. We have quantified the gap that exists between this known achievable ...

  1. Fair resource allocation in multiple access channels

    E-Print Network [OSTI]

    ParandehGheibi, Ali

    2008-01-01

    We consider the problem of resource allocation in a multiple access channel. Our objective is to obtain rate and power allocation policies that maximize a general concave utility function of average transmission rates over ...

  2. Optimal bandwidth allocation in a delay channel

    E-Print Network [OSTI]

    Ehsan, Navid; Liu, Mingyan

    2006-01-01

    following cost function: latest allocation will not make anyslot allocation problem, if the cost , then: function 1) forALLOCATION IN A DELAY CHANNEL If represents the value function

  3. Multi-channel coded-aperture photography

    E-Print Network [OSTI]

    Baek, Jongmin

    2008-01-01

    This thesis describes the multi-channel coded-aperture photography, a modified camera system that can extract an all-focus image of the scene along with a depth estimate over the scene. The modification consists of inserting ...

  4. Automatic Quantification of Cache Side-Channels

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    Automatic Quantification of Cache Side-Channels Boris K¨opf1 , Laurent Mauborgne1 , and Mart. In this paper we propose a novel method for automatically deriving upper bounds on the amount of information

  5. Optimal Distributed Beamforming for MISO Interference Channels 

    E-Print Network [OSTI]

    Qiu, Jiaming

    2012-07-16

    In this thesis, the problem of quantifying the Pareto optimal boundary of the achievable rate region is considered over multiple-input single-output(MISO)interference channels, where the problem boils down to solving a sequence of convex feasibility...

  6. Single-channel fits and K-matrix constraints

    E-Print Network [OSTI]

    R. L. Workman

    2006-01-10

    A K-matrix formalism is used to relate single-channel and multi-channel fits. We show how the single-channel formalism changes as new hadronic channels become accessible. These relations are compared to those commonly used to fit pseudoscalar meson photoproduction data.

  7. Multi-Keyhole MIMO Channels: Asymptotic Analysis of Outage Capacity

    E-Print Network [OSTI]

    Loyka, Sergey

    Multi-Keyhole MIMO Channels: Asymptotic Analysis of Outage Capacity George Levin and Sergey Loyka single-keyhole channels. The outage capacity distribution of both full-rank and rank-deficient multi channel, outage capacity, correlation. I. INTRODUCTION Multiple-Input-Multiple-Output (MIMO) channels have

  8. FLUID: Improving Throughputs in Enterprise Wireless LANs through Flexible Channelization

    E-Print Network [OSTI]

    Liblit, Ben

    the usefulness of flexible channels in the context of 802.11-based networks. Current 802.11 hardware can provideFLUID: Improving Throughputs in Enterprise Wireless LANs through Flexible Channelization Shravan for designing 802.11 wireless LANs (WLANs) using flexible channelization -- the choice of an appropriate channel

  9. Multiple description source coding for mobile radio channels 

    E-Print Network [OSTI]

    Pegnyemb, Telesphore Bertrand

    1999-01-01

    The topic of this thesis is the transmission of a memoryless source over a slow fading channel. It should be noted that when a channel is specified as a slow fading channel, it does not specify whether the channel is flat ...

  10. Numerical Simulation of Horizontal Continuous Casting Process of C194 Copper Alloy

    SciTech Connect (OSTI)

    Huang Guojie; Xie Shuisheng; Cheng Lei; Cheng Zhenkang [State Key Laboratory for Fabrication and Processing of Nonferrous Metals, Beijing General Research Institute for Non-ferrous Metals, China, 100088 (China)

    2007-05-17

    Horizontal Continuous Casting (H.C.C) is an important method to cast C194 copper ingot. In this paper, numerical simulation is adopted to investigate the casting process in order to optimize the H.C.C technical parameters, such as the casting temperature, casting speed and cooling intensity. According to the numerical results, the reasonable parameters are that the casting temperature is between 1383K{approx}1463K, the casting speed is between 7.2m/h{approx}10.8m/h and the speed of cooling water is between 3.6m/s{approx}4.6m/s. The results of numerical simulation provide the significant reference to the subsequent experiments.

  11. Method for forming an in situ oil shale retort with horizontal free faces

    DOE Patents [OSTI]

    Ricketts, Thomas E. (Grand Junction, CO); Fernandes, Robert J. (Bakersfield, CA)

    1983-01-01

    A method for forming a fragmented permeable mass of formation particles in an in situ oil shale retort is provided. A horizontally extending void is excavated in unfragmented formation containing oil shale and a zone of unfragmented formation is left adjacent the void. An array of explosive charges is formed in the zone of unfragmented formation. The array of explosive charges comprises rows of central explosive charges surrounded by a band of outer explosive charges which are adjacent side boundaries of the retort being formed. The powder factor of each outer explosive charge is made about equal to the powder factor of each central explosive charge. The explosive charges are detonated for explosively expanding the zone of unfragmented formation toward the void for forming the fragmented permeable mass of formation particles having a reasonably uniformly distributed void fraction in the in situ oil shale retort.

  12. Apparatus and method for the horizontal, crucible-free growth of silicon sheet crystals

    DOE Patents [OSTI]

    Ciszek, T.F.

    1984-09-12

    Apparatus is provided for continuously forming a silicon crystal sheet from a silicon rod in a non-crucible environment. The rod is rotated and fed toward an RF coil in an inert atmosphere so that the upper end of the rod becomes molten and the silicon sheet crystal is pulled therefrom substantially horizontally in a continuous strip. A shorting ring may be provided around the rod to limit the heating to the upper end only. Argon gas can be used to create the inert atmosphere within a suitable closed chamber. By use of this apparatus and method, a substantially defect-free silicon crystal sheet is formed which can be used for micro-circuitry chips or solar cells.

  13. Experimental on two sensors combination used in horizontal pipe gas-water two-phase flow

    SciTech Connect (OSTI)

    Wu, Hao; Dong, Feng

    2014-04-11

    Gas-water two phase flow phenomenon widely exists in production and living and the measurement of it is meaningful. A new type of long-waist cone flow sensor has been designed to measure two-phase mass flow rate. Six rings structure of conductance probe is used to measure volume fraction and axial velocity. The calibration of them have been made. Two sensors have been combined in horizontal pipeline experiment to measure two-phase flow mass flow rate. Several model of gas-water two-phase flow has been discussed. The calculation errors of total mass flow rate measurement is less than 5% based on the revised homogeneous flow model.

  14. Impact on Spin Tune From Horizontal Orbital Angle Between Snakes and Orbital Angle Between Spin Rotators

    SciTech Connect (OSTI)

    Bai,M.; Ptitsyn, V.; Roser, T.

    2008-10-01

    To keep the spin tune in the spin depolarizing resonance free region is required for accelerating polarized protons to high energy. In RHIC, two snakes are located at the opposite side of each accelerator. They are configured to yield a spin tune of 1/2. Two pairs of spin rotators are located at either side of two detectors in each ring in RHIC to provide longitudinal polarization for the experiments. Since the spin rotation from vertical to longitudinal is localized between the two rotators, the spin rotators do not change the spin tune. However, due to the imperfection of the orbits around the snakes and rotators, the spin tune can be shifted. This note presents the impact of the horizontal orbital angle between the two snakes on the spin tune, as well as the effect of the vertical orbital angle between two rotators at either side of the collision point on the spin tune.

  15. Multivariate Analysis of Globular Cluster's Horizontal Branch Morphology: searching for the second parameter

    E-Print Network [OSTI]

    A. Recio-Blanco; A. Aparicio; G. Piotto; F. De Angeli; S. G. Djorgovski

    2005-11-24

    The interpretation of globular cluster horizontal branch (HB) morphology is a classical problem that can significantly blur our understanding of stellar populations. In this paper, we present a new multivariate analysis connecting the effective temperature extent of the HB with other cluster parameters. The work is based on Hubble Space Telescope photometry of 54 Galactic globular clusters. The present study reveals an important role of the total mass of the globular cluster on its HB morphology. More massive clusters tend to have HBs more extended to higher temperatures. For a set of three input variables including the temperature extension of the HB, [Fe/H] and M_V, the first two eigenvectors account for the 90% of the total sample variance. Possible effects of cluster self-pollution on HB morphology, eventually stronger in more massive clusters, could explain the results here derived.

  16. Methane drainage with horizontal boreholes in advance of longwall mining: an analysis. Final report

    SciTech Connect (OSTI)

    Gabello, D.P.; Felts, L.L.; Hayoz, F.P.

    1981-05-01

    The US Department of Energy (DOE) Morgantown Energy Technology Center has implemented a comprehensive program to demonstrate the technical and economic viability of coalbed methane as an energy resource. The program is directed toward solution of technical and institutional problems impeding the recovery and use of large quantities of methane contained in the nation's minable and unminable coalbeds. Conducted in direct support of the DOE Methane Recovery from Coalbeds Project, this study analyzes the economic aspects of a horizontal borehole methane recovery system integrated as part of a longwall mine operation. It establishes relationships between methane selling price and annual mine production, methane production rate, and the methane drainage system capital investment. Results are encouraging, indicating that an annual coal production increase of approximately eight percent would offset all associated drainage costs over the range of methane production rates and capital investments considered.

  17. Sand transport and deposition in horizontal multiphase trunklines of subsea satellite developments

    SciTech Connect (OSTI)

    Oudeman, P. )

    1993-11-01

    Gravel packing is unattractive as a way to protect against the effects of sand production in subsea wells because it involves additional completion costs, loss of productivity, and difficulties in subsequent recompletion/well servicing operations. On the other hand, omitting gravel packs means that subsea developments must be designed and operated so that they can tolerate sand production. An experimental study was carried out on sand transport and deposition in multiphase flow in modeled subsea flowlines to address the problem and sand collection in horizontal trunklines, which could lead to reduced line throughput, pigging problems, enhanced pipe-bottom erosion, or even blockage. This study led to the definition of a new model for sand transport in multiphase flow, which was used to establish the risk of sand deposition in trunklines connecting a subsea development to nearby production platform.

  18. Combined Experiment Phase 1. [Horizontal axis wind turbines: wind tunnel testing versus field testing

    SciTech Connect (OSTI)

    Butterfield, C.P.; Musial, W.P.; Simms, D.A.

    1992-10-01

    How does wind tunnel airfoil data differ from the airfoil performance on an operating horizontal axis wind turbine (HAWT) The National Renewable Energy laboratory has been conducting a comprehensive test program focused on answering this question and understanding the basic fluid mechanics of rotating HAWT stall aerodynamics. The basic approach was to instrument a wind rotor, using an airfoil that was well documented by wind tunnel tests, and measure operating pressure distributions on the rotating blade. Based an the integrated values of the pressure data, airfoil performance coefficients were obtained, and comparisons were made between the rotating data and the wind tunnel data. Care was taken to the aerodynamic and geometric differences between the rotating and the wind tunnel models. This is the first of two reports describing the Combined Experiment Program and its results. This Phase I report covers background information such as test setup and instrumentation. It also includes wind tunnel test results and roughness testing.

  19. Aerodynamic Models For Hurricanes I. Model description and horizontal motion of hurricane

    E-Print Network [OSTI]

    Leonov, Arkady I

    2008-01-01

    Aerodynamic models are developed to describe coherent structures and transport processes in hurricanes moving over open seas. The models consist of the lower boundary layer and upper adiabatic layer. Except friction at the air/sea interface,proposed modeling avoids the common turbulent approximations while using explicitly or implicitly basic stability constraints. The models analyze dynamics of upper hurricane adiabatic layer, dynamics and transport processes in hurricane boundary layer, and genesis and maturing of hurricane. The proposed modeling provides a rude enough but consistent analytical description of basic processes in hurricanes. The present paper qualitatively describes the model of mature hurricane, briefly discusses the basic thermodynamic relations and aerodynamic equations, and establishes the principles of horizontal motion for mature hurricane.

  20. Horizontal Devonian shale well, Columbia Natural Resources, Inc.`s, Pocohontas Development Corp. Well 21747, Martin County, Kentucky. Final report

    SciTech Connect (OSTI)

    Koziar, G.; Ahmad, M.M.; Friend, L.L.; Friend, M.L.; Rothman, E.M.; Stollar, R.L. [Columbia Gas System Service Corp., Columbus, OH (United States)] [Columbia Gas System Service Corp., Columbus, OH (United States)

    1991-05-01

    Columbia Gas and the United States Department of Energy (DOE) have successfully completed field work on a horizontally drilled Devonian shale well located in Martin County, Kentucky. The objective of this cofunded project is to assess the effectiveness and economic feasibility of applying horizontal drilling and hydraulically fracturing stimulation techniques to enhance the extraction of natural gas from the Devonian shale. The well is comprised of three segments: a conventional vertical section, an angle build section and a horizontal section. The well reached a measured depth (MD) of 6263 feet, 3810 feet true vertical depth (TVD), with a horizontal displacement of 2812 feet achieved in the desired direction of N10{degrees}W. Both air and foam were used as drilling fluids. The vertical, lateral and tangent sections were drilled using conventional rotary drilling methods. Downhole motors were used to build angle. A total combined final open flow of 3.1 MMcfd was measured from all zones. Total well expenditures are approximately $1,460,000. Of this amount, $700,000 is directly related to the research and learning curve experience aspects. It is projected that the same horizontal well could be drilled with existing technology for $700,000. If advanced can be made in MWD systems for air drilling environments, wells of this type could be drilled routinely for $500,000. It appears that application of horizontal drilling will result in at least acceleration of gas production and possibly the addition of recoverable reserves from the Devonian shale. Production data, necessary to validate this statement, are also required to determine the economics. As we gain experience and technology advances, cost reductions will occur; this will result in economic improvement.

  1. Horizontal Devonian shale well, Columbia Natural Resources, Inc. 's, Pocohontas Development Corp. Well 21747, Martin County, Kentucky

    SciTech Connect (OSTI)

    Koziar, G.; Ahmad, M.M.; Friend, L.L.; Friend, M.L.; Rothman, E.M.; Stollar, R.L. (Columbia Gas System Service Corp., Columbus, OH (United States))

    1991-05-01

    Columbia Gas and the United States Department of Energy (DOE) have successfully completed field work on a horizontally drilled Devonian shale well located in Martin County, Kentucky. The objective of this cofunded project is to assess the effectiveness and economic feasibility of applying horizontal drilling and hydraulically fracturing stimulation techniques to enhance the extraction of natural gas from the Devonian shale. The well is comprised of three segments: a conventional vertical section, an angle build section and a horizontal section. The well reached a measured depth (MD) of 6263 feet, 3810 feet true vertical depth (TVD), with a horizontal displacement of 2812 feet achieved in the desired direction of N10{degrees}W. Both air and foam were used as drilling fluids. The vertical, lateral and tangent sections were drilled using conventional rotary drilling methods. Downhole motors were used to build angle. A total combined final open flow of 3.1 MMcfd was measured from all zones. Total well expenditures are approximately $1,460,000. Of this amount, $700,000 is directly related to the research and learning curve experience aspects. It is projected that the same horizontal well could be drilled with existing technology for $700,000. If advanced can be made in MWD systems for air drilling environments, wells of this type could be drilled routinely for $500,000. It appears that application of horizontal drilling will result in at least acceleration of gas production and possibly the addition of recoverable reserves from the Devonian shale. Production data, necessary to validate this statement, are also required to determine the economics. As we gain experience and technology advances, cost reductions will occur; this will result in economic improvement.

  2. Comparison of transient horizontal magnetic fields in a plage region and in the quiet Sun

    E-Print Network [OSTI]

    Ryohko Ishikawa; Saku Tsuneta

    2008-12-09

    Properties of transient horizontal magnetic fields (THMFs) in both plage and quiet Sun regions are obtained and compared. Spectro-polarimetric observations with the Solar Optical Telescope (SOT) on the Hinode satellite were carried out with a cadence of about 30 seconds for both plage and quiet regions located near disk center. We select THMFs that have net linear polarization (LP) higher than 0.22%, and an area larger than or equal to 3 pixels, and compare their occurrence rates and distribution of magnetic field azimuth. We obtain probability density functions (PDFs) of magnetic field strength and inclination for both regions.The occurrence rate in the plage region is the same as for the quiet Sun. The vertical magnetic flux in the plage region is ~8 times larger than in the quiet Sun. There is essentially no preferred orientation for the THMFs in either region. However, THMFs in the plage region with higher LP have a preferred direction consistent with that of the plage-region's large-scale vertical field pattern. PDFs show that there is no difference in the distribution of field strength of horizontal fields between the quiet Sun and the plage regions when we avoid the persistent large vertical flux concentrations for the plage region. The similarity of the PDFs and of the occurrence rates in plage and quiet regions suggests that a local dynamo process due to the granular motion may generate THMFs all over the sun. The preferred orientation for higher LP in the plage indicates that the THMFs are somewhat influenced by the larger-scale magnetic field pattern of the plage.

  3. Outage Analysis for MIMO Rician Channels and Channels with Partial CSI

    E-Print Network [OSTI]

    Lee, Yong Hoon

    Outage Analysis for MIMO Rician Channels and Channels with Partial CSI Won-Yong Shin, Sae the outage performance and diversity- multiplexing tradeoff (DMT), originally introduced by Zheng and Tse (CSIT). The asymptotic behaviors of the outage are analyzed in the limit of high signal-to-noise ratio

  4. Optimal Skewed Data Allocation on Multiple Channels with Flat Broadcast per Channel

    E-Print Network [OSTI]

    Pinotti, Maria Cristina

    to a large number of clients. Consider data services on cellular networks, such as stock quotes, weather info. In this scenario, a server at the base-station repeatedly transmits data items from a given set over a wirelessOptimal Skewed Data Allocation on Multiple Channels with Flat Broadcast per Channel Elia Ardizzoni

  5. Source-channel Coding for Gaussian Sources Over a Gaussian Multiple Access Channel

    E-Print Network [OSTI]

    Sharma, Vinod

    extended in [19] to the system with side information and distortion. The distributed Gaussian source codingSource-channel Coding for Gaussian Sources Over a Gaussian Multiple Access Channel R Rajesh and Vinod Sharma Dept. of Electrical Communication Engg. Indian Institute of Science Bangalore, India Email

  6. Combining EMD with ICA for Extracting Independent Sources from Single Channel and Two-Channel Data

    E-Print Network [OSTI]

    Separation (BSS) techniques are frequently needed in the processing of biomedical signals. This need comes-channel biosignal processing. I. INTRODUCTION In the field of biomedical signal processing, independent sources is very prominent in this case. An example of processing 2-channel signals is EEG signal processing

  7. Pair creation in heavy ion channeling

    E-Print Network [OSTI]

    Nikolay A. Belov; Zoltán Harman

    2014-11-20

    Heavy ions channeling through crystals with multi-GeV kinetic energies can create electron-positron pairs. In the framework of the ion, the energy of virtual photons arising from the periodic crystal potential may exceed the threshold $2mc^2$. The repeated periodic collisions with the crystal ions yield high pair production rates. When the virtual photon frequency matches a nuclear transition in the ion, the production rate can be resonantly increased. In this two-step excitation-pair conversion scheme, the excitation rates are coherently enhanced, and they scale approximately quadratically with the number of crystal sites along the channel.

  8. Digitally Assisted Multi-Channel Receivers 

    E-Print Network [OSTI]

    Pentakota, Krishna Anand Santosh Spikanth

    2011-10-21

    and it is shown that the sinc filter banks have very low computational complexity in data estimation Nextly, analytical tools for the design of clock-jitter tolerant multi-channel filter- bank receivers have been developed. Clock-jitter is one of the most... fundamental obstacles for the future generation of wideband receivers. Additionally all the trade-offs and specifications of a design example for a multi-channel receiver that can process a 5 GHz baseband signal with 40 dB of signal-to-noise-ratio (SNR...

  9. Gravity Waves in a Horizontal Shear Flow. Part II: Interaction between Gravity Waves and Potential Vorticity Perturbations

    E-Print Network [OSTI]

    Farrell, Brian F.

    Gravity Waves in a Horizontal Shear Flow. Part II: Interaction between Gravity Waves and Potential perturbations and propagating internal gravity waves in a horizon- tally sheared zonal flow is investigated. In the strong stratification limit, an initial vorticity perturbation weakly excites two propagating gravity

  10. Apparatus for efficient sidewall containment of molten metal with horizontal alternating magnetic fields utilizing low reluctance rims

    DOE Patents [OSTI]

    Praeg, Walter F. (Palos Park, IL)

    1999-01-01

    A method and apparatus for casting sheets of metal from molten metal. The apparatus includes a containment structure having an open side, a horizontal alternating magnetic field generating structure and rollers including low reluctance rim structures. The magnetic field and the rollers help contain the molten metal from leaking out of the containment structure.

  11. Geological aspects of drilling horizontal wells in steam flood reservoirs, west side, southern San Joaquin Valley, California

    SciTech Connect (OSTI)

    Crough, D.D.; Holman, M.L.; Sande, J.J. (Shell Western E P Inc., Bakersfield, CA (United States))

    1994-04-01

    Shell Western E P Inc. has drilled 11 horizontal wells in four mature steam floods in the Coalinga, South Belridge, and Midway-Sunset fields. Two medium radius wells are producing from the Pliocene Etchegoin Formation in Coalinga. One medium radius well is producing from the Pleistocene Tulare Formation in South Belridge field. Three short radius and five medium radius wells are producing from the upper Miocene, Sub-Hoyt and Potter sands in Midway-Sunset field. Horizontal wells at the base of these reservoirs and/or structurally downdip near the oil-water contact are ideally suited to take advantage of the gravity drainage production mechanism. Reservoir studies and production experience have shown these horizontal wells should increase reserves, improve recovery efficiency, improve the oil-steam ratio, and improve project profitability. Geological considerations of targeting the wells vary between fields because of the different depositional environments and resulting reservoir characteristics. The thin sands and semicontinuous shales in the Tulare Formation and the Etchegoin Formation require strict structural control on the top and base of the target sand. In the Sub-Hoyt and Potter sands, irregularities of the oil-water contact and sand and shale discontinuities must be understood. Logging and measurement while drilling provide geosteering capability in medium radius wells. Teamwork between all engineering disciplines and drilling and producing operations has been critical to horizontal well success.

  12. Analytical and semi-analytical solutions of horizontal well capture times under no-ow and constant-head boundaries

    E-Print Network [OSTI]

    Zhan, Hongbin

    constrain the vertical ¯ow, but enhance the horizontal ¯ow, resulting in elongated iso- capture time curves to re- plenish the aquifers, resulting in less elongated iso-capture time curves. Ó 2000 Elsevier with surface restrictions (e.g., land®lls, lagoons, buildings, wetlands, lakes, utility lines, tanks), (2

  13. Abstract--this paper proposes a MIMO linear quadratic regulator (LQR) controller designed for a horizontal variable

    E-Print Network [OSTI]

    Boyer, Edmond

    for a horizontal variable speed wind turbine with focus on the operating range referring to the above rated wind speeds. The operating conditions of wind turbines make them subject to fluctuating loads that create with the trade-off between the wind energy conversion maximization and the minimization of the fatigue

  14. Optimization of Vertical and Horizontal Beamforming Kernels on the PowerPC G4 Processor with AltiVec Technology

    E-Print Network [OSTI]

    Cho, Young Hyun

    1 Optimization of Vertical and Horizontal Beamforming Kernels on the PowerPC G4 Processor with Alti-time on a Sun UltraSPARC II server with 16 333-MHz processors by utilizing the Visual Instruction Set (VIS beamforming kernels to use AltiVec SIMD extension for the PowerPC. AltiVec can execute up to four 32-bit

  15. Impacts of Soil and Pipe Thermal Conductivity on Performance of Horizontal Pipe in a Ground-source Heat Pump 

    E-Print Network [OSTI]

    Song, Y.; Yao, Y.; Na, W.

    2006-01-01

    In this paper the composition and thermal property of soil are discussed. The main factors that impact the soil thermal conductivity and several commonly-used pipe materials are studied. A model of heat exchanger with horizontal pipes of ground-source...

  16. Apparatus for efficient sidewall containment of molten metal with horizontal alternating magnetic fields utilizing a ferromagnetic dam

    DOE Patents [OSTI]

    Praeg, W.F.

    1997-02-11

    An apparatus is disclosed for casting sheets of metal from molten metal. The apparatus includes a containment structure having an open side, a horizontal alternating magnetic field generating structure and a ferromagnetic dam. The magnetic field and the ferromagnetic dam contain the molten metal from leaking out side portions of the open side of the containment structure. 25 figs.

  17. Apparatus for efficient sidewall containment of molten metal with horizontal alternating magnetic fields utilizing a ferromagnetic dam

    DOE Patents [OSTI]

    Praeg, Walter F. (Palos Park, IL)

    1997-01-01

    An apparatus for casting sheets of metal from molten metal. The apparatus includes a containment structure having an open side, a horizontal alternating magnetic field generating structure and a ferromagnetic dam. The magnetic field and the ferromagnetic dam contain the molten metal from leaking out side portions of the open side of the containment structure.

  18. Economic Impact of Reservoir Properties, Horizontal Well Length and Orientation on Production from Shale Formations: Application to New

    E-Print Network [OSTI]

    Mohaghegh, Shahab

    and the orientation of horizontal wells on gas production in New Albany Shale. The study was conducted using on the Net Present Value of investing on gas wells producing from New Albany Shale. Introduction New Albany Shale Gas -The New Albany Shale is predominantly an organic-rich brownish-black and grayish-black shale

  19. Recovery of bypassed oil in the Dundee Formation using horizontal drains. Annual report, March 1996--March 1997

    SciTech Connect (OSTI)

    1998-04-01

    This Class II field project has demonstrated that economic quantities of hydrocarbons can be produced from abandoned or nearly abandoned fields in the Dundee Formation of Central Michigan using horizontal drilling technology. The site selected for the demonstration horizontal well was Crystal Field, a nearly abandoned Dundee oil field in Montcalm County, Michigan. This field had produced over 8 million barrels of oil, mostly in the 1930`s and 1940`s. At the height of development, Crystal Field produced from 193 wells, but by 1995, only seven producing wells remained, each producing less than 10 bbls/day. A horizontal well, the TOW 1-3, drilled as a field demonstration pilot was successful, producing at rate of 100 bbls of oil per day with a zero water cut. Although the well is capable of producing at a of 500+ bbls/day, the production rate is being kept low deliberately to try to prevent premature water coning. Cumulative production exceeded 50,000 bbls of oil by the end of April, 1997 and lead to the permitting and licensing of several dozen Dundee wells by project end. Twelve of these permits were for continued development of Crystal Field. Two long horizontal wells were drilled successfully in Crystal after the TOW 1-3, but were disappointing economically. Core and logs from the Dundee interval were recovered from a vertical borehole at the same surface location. The addition of several horizontal wells will likely add another 2 million bbls (or more) to the cumulative production of the field over the next few years. If other abandoned Dundee fields are re-developed in a similar manner, the additional oil produced could exceed 80 million barrels.

  20. Fuel cell collector plates with improved mass transfer channels

    DOE Patents [OSTI]

    Gurau, Vladimir (Miami, FL); Barbir, Frano (Palm Beach Gardens, FL); Neutzler, Jay K. (Palm Beach Gardens, FL)

    2003-04-22

    A fuel cell collector plate can be provided with one or more various channel constructions for the transport of reactants to the gas diffusion layer and the removal of water therefrom. The outlet channel can be arranged to have a reduced volume compared to the inlet channel, in both interdigitated and discontinuous spiral applications. The land width between an inlet channel and outlet channel can be reduced to improved mass flow rate in regions of deleted reactant concentrations. Additionally or alternatively, the depth of the inlet channel can be reduced in the direction of flow to reduce the diffusion path as the concentration of reactant is reduced.

  1. On Cryptographic Primitives Based on Noisy Channels

    E-Print Network [OSTI]

    Morozov, Kirill

    based on BSC is also analysed in the non- asymptotic case. We derive relations for the failure- cation is valid hereby preparing a ground for our results concerning OT based on Unfair Noisy Channels (UNC). In contrast to the noise models mentioned above, a corrupted party is given a partial control

  2. On Cryptographic Primitives Based on Noisy Channels

    E-Print Network [OSTI]

    Morozov, Kirill

    based on BSC is also analysed in the non­ asymptotic case. We derive relations for the failure­ cation is valid hereby preparing a ground for our results concerning OT based on Unfair Noisy Channels (UNC). In contrast to the noise models mentioned above, a corrupted party is given a partial control

  3. Channel Routing for Integrated Optics Christopher Condrat

    E-Print Network [OSTI]

    Kalla, Priyank

    Channel Routing for Integrated Optics Christopher Condrat (chris@g6net.com) Priyank Kalla (kalla, Salt Lake City, UT, USA Abstract--Increasing scope and applications of integrated optics necessitates the development of automated techniques for physical design of optical systems. This paper presents an automated

  4. Variational Bayesian Blind and Semiblind Channel Estimation

    E-Print Network [OSTI]

    Gesbert, David

    elaborate the details for the case of MIMO OFDM systems. I. INTRODUCTION Blind and semiblind channel, SFR , Orange, STEricsson, Cisco, BMW Group , SAP, Monaco Telecom and Symantec. The research reported herein has also been partially supported by the European FP7 NoE NewCom++ and FET project CROWN

  5. Transformer Recharging with Alpha Channeling in Tokamaks

    SciTech Connect (OSTI)

    N.J. Fisch

    2009-12-21

    Transformer recharging with lower hybrid waves in tokamaks can give low average auxiliary power if the resistivity is kept high enough during the radio frequency (rf) recharging stage. At the same time, operation in the hot ion mode via alpha channeling increases the effective fusion reactivity. This paper will address the extent to which these two large cost saving steps are compatible. __________________________________________________

  6. Study of transport properties in rippled channels

    E-Print Network [OSTI]

    Ivan Herrera; Alberto Mendoza; Eduardo S. Tututi

    2005-10-16

    We study dynamical properties of bouncing particles inside of channels with sinusoidal walls. Taking as parameters the amplitude and the phases between the walls we study the transmitivity and its dependence on these parameters. We find an analytical approximation for transmitivity for small amplitudes, which is corroborated by numerical calculation.

  7. Quarterly Journal of the Royal Meteorological Society Q. J. R. Meteorol. Soc. 00: 110 (2011) Parametrizing the horizontal inhomogeneity of ice water

    E-Print Network [OSTI]

    Hogan, Robin

    2011-01-01

    ) Parametrizing the horizontal inhomogeneity of ice water content using CloudSat data products Peter G. Hilla quantities in the presence of a cloud it is necessary to know not only the mean water content, but also the distribution of this water content. This article describes a study of the in-cloud horizontal inhomogeneity

  8. Analysis of a Lifting Fixture to Hold a Steel Mandrel Horizontally from one End Support

    SciTech Connect (OSTI)

    Cease, H.; /Fermilab

    1999-04-07

    A lifting fixture (drawing number 3823.113-MD-372382) that lifts large steel mandrels from one end through the mandrel's end support web is described. The mandrels are used as a mold to form carbon fiber cylinders. The mandrels are held from one end to allow the carbon cylinder to be pulled horizontally off the mandrel. Only mandrels as described in drawing numbers 3823.113-MD-358992 and 3823.1 13-MD-358994 are lifted by the fixture. The largest mandrel is 41 inches in diameter, 120 inches long, and weighs approximately 3,000 lbs. A detailed procedure for removing the carbon cylinder from the steel mandrel is given in the Appendix. The fixture is to be supported only using Fermilab Forklift 10207 or equivalent. The forklift has a nameplate capacity of 12,000 lbs 24 inches from the mast at an elevation of 130 inches from the floor. The forklift forks must be removed from the truck prior to using the fixture. The forklift is to be used to support the mandrels only during the lifting operation and is not to be used to transport the mandrels. Stresses at the lifting fixture are shear stresses on the support brackets due to the overall weight of the mandrel and moment loads due to the cantilever style suppOrt. The moment on the forklift due to the overhanging weight of the mandrel is calculated. Stresses in the mandrel due to the method of support are also described.

  9. Experimental investigation of ice slurry flow pressure drop in horizontal tubes

    SciTech Connect (OSTI)

    Grozdek, Marino; Khodabandeh, Rahmatollah; Lundqvist, Per [Royal Institute of Technology, Department of Energy Technology, Division of Applied Thermodynamics and Refrigeration, Brinellvaegen 68, 10044 Stockholm (Sweden)

    2009-01-15

    Pressure drop behaviour of ice slurry based on ethanol-water mixture in circular horizontal tubes has been experimentally investigated. The secondary fluid was prepared by mixing ethyl alcohol and water to obtain initial alcohol concentration of 10.3% (initial freezing temperature -4.4 C). The pressure drop tests were conducted to cover laminar and slightly turbulent flow with ice mass fraction varying from 0% to 30% depending on test conditions. Results from flow tests reveal much higher pressure drop for higher ice concentrations and higher velocities in comparison to the single phase flow. However for ice concentrations of 15% and higher, certain velocity exists at which ice slurry pressure drop is same or even lower than for single phase flow. It seems that higher ice concentration delay flow pattern transition moment (from laminar to turbulent) toward higher velocities. In addition experimental results for pressure drop were compared to the analytical results, based on Poiseulle and Buckingham-Reiner models for laminar flow, Blasius, Darby and Melson, Dodge and Metzner, Steffe and Tomita for turbulent region and general correlation of Kitanovski which is valid for both flow regimes. For laminar flow and low buoyancy numbers Buckingham-Reiner method gives good agreement with experimental results while for turbulent flow best fit is provided with Dodge-Metzner and Tomita methods. Furthermore, for transport purposes it has been shown that ice mass fraction of 20% offers best ratio of ice slurry transport capability and required pumping power. (author)

  10. DOUBLE HORIZONTAL BRANCHES IN NGC 6440 AND NGC 6569 UNVEILED BY THE VVV SURVEY

    SciTech Connect (OSTI)

    Mauro, Francesco; Bidin, Christian Moni; Cohen, Roger; Geisler, Doug; Chene, Andre-Nicolas; Villanova, Sandro; Minniti, Dante; Catelan, Marcio

    2012-12-20

    We report the discovery of a peculiar horizontal branch (HB) in NGC 6440 and NGC 6569, two massive and metal-rich Galactic globular clusters (GGCs) located in the Galactic bulge, within 4 kpc from the Galactic center. In both clusters, two distinct clumps are detected at the level of the cluster HB, separated by only {approx}0.1 mag in the K{sub s} band. They were detected with IR photometric data collected with the 'VISTA Variables in the Via Lactea' Survey, and confirmed in independent IR catalogs available in the literature and Hubble Space Telescope optical photometry. Our analysis demonstrates that these clumps are real cluster features, not a product of field contamination or interstellar reddening. The observed split HBs could be a signature of two stellar sub-populations with different chemical composition and/or age, as recently found in Terzan 5, but it cannot be excluded that they are caused by evolutionary effects, in particular for NGC 6440. This interpretation, however, requires an anomalously high helium content (Y > 0.30). Our discovery suggests that such a peculiar HB morphology could be a common feature of massive, metal-rich bulge GGCs.

  11. Technology assessment of vertical and horizontal air drilling potential in the United States. Final report

    SciTech Connect (OSTI)

    Carden, R.S.

    1993-08-18

    The objective of the research was to assess the potential for vertical, directional and horizontal air drilling in the United States and to evaluate the current technology used in air drilling. To accomplish the task, the continental United States was divided into drilling regions and provinces. The map in Appendix A shows the divisions. Air drilling data were accumulated for as many provinces as possible. The data were used to define the potential problems associated with air drilling, to determine the limitations of air drilling and to analyze the relative economics of drilling with air versus drilling mud. While gathering the drilling data, operators, drilling contractors, air drilling contractors, and service companies were contacted. Their opinion as to the advantages and limitations of air drilling were discussed. Each was specifically asked if they thought air drilling could be expanded within the continental United States and where that expansion could take place. The well data were collected and placed in a data base. Over 165 records were collected. Once in the data base, the information was analyzed to determine the economics of air drilling and to determine the limiting factors associated with air drilling.

  12. Model of horizontal stress in the Aigion10 well (Corinth) calculated from acoustic body waves

    E-Print Network [OSTI]

    Rousseau, A

    2006-01-01

    In this paper we try to deduce the in situ stresses from the monopole acoustic waves of the well AIG10 between 689 and 1004 meters in depth (Corinth Golf). This borehole crosses competent sedimentary formations (mainly limestone), and the active Aigion fault between 769 and 780 meters in depth. This study is the application of two methods previously described by the author who shows the relationships between in situ horizontal stresses, and (i) the presence or absence of double body waves, (ii) the amplitude ratios between S and P waves (Rousseau, 2005a,b). The full waveforms of this well exhibit two distinct domains separated by the Aigion fault. Within the upper area the three typical waves (P, S and Stoneley) may appear, but the S waves are not numerous, and there is no double body wave, whereas within the lower area there are sometimes double P waves, but no S waves. From those observations, we conclude that the stress domain is isotropic above the Aigion fault, and anisotropic below, which is consistent ...

  13. Underbalanced coiled-tubing-drilled horizontal well in the North Sea

    SciTech Connect (OSTI)

    Wodka, P.; Tirsgaard, H.; Damgaard, A.P.; Adamsen, C.J.

    1996-05-01

    Maersk Olie and Gas A/S (Maersk Oil) has drilled a 3,309-ft-long near-horizontal drainhole with coiled tubing to a total measured depth (MD) of 11,000 ft in the Danish sector of the North Sea. The well was completed in may 1994 as a 3{1/2}-in. openhole producer in the Gorm field chalk reservoir. Part of the well was drilled at underbalanced conditions, and oil production rates of up to 1,100 STB/D were reached during drilling. Conventional well-test equipment was used for handling returns. A nearby process facilities platform supplied lift gas and received the produced hydrocarbons during the drilling phase. Worth noting are the penetration of several chert layers, the fairly long reach, and the application of geosteering. Indications were that the well productivity was significantly improved compared with that of a conventionally drilled well, but problems were experienced with borehole stability in a fractured region.

  14. Modeling vertical and horizontal solute transport for the Weldon Spring Site Remedial Action Project

    SciTech Connect (OSTI)

    Tomasko, D.

    1992-11-01

    This technical memorandum presents a one-dimensional model to simulate the transport of a contaminant that originates as a liquid release, moves vertically downward through a vadose zone, mixes with initially clean groundwater in an unconfined aquifer, and ends at a downgradient extraction well. Vertical and horizontal segments of the contaminant pathway are coupled by assuming that the breakthrough curve of the contaminant at the water table acts as a contaminant source for the unconfined aquifer. For simplicity, this source is assumed to be a time-shifted unit square wave having an amplitude equal to the peak breakthrough concentration at the water table and a duration equal to the full width of the breakthrough curve at the half-maximum concentration value. The effects of dilution at the water-table interface are evaluated with a simple mass-balance equation. Comparing the model results for the chemical plant area of the Weldon Spring site near St. Louis, Missouri, and the Envirocare facility located near Salt Lake City, Utah, with those obtained from a solution formulated with the real and imaginary parts of a Fourier series in Laplace space indicates that the model provides a conservative estimate of the contaminant breakthrough curve at the receptor.

  15. EFFECT OF HORIZONTALLY INHOMOGENEOUS HEATING ON FLOW AND MAGNETIC FIELD IN THE CHROMOSPHERE OF THE SUN

    SciTech Connect (OSTI)

    Song, P.; Vasyli?nas, V. M.

    2014-12-01

    The solar chromosphere is heated by damped Alfvén waves propagating upward from the photosphere at a rate that depends on magnetic field strength, producing enhanced heating at low altitudes in the extended weak-field regions (where the additional heating accounts for the radiative losses) between the boundaries of the chromospheric network as well as enhanced heating per particle at higher altitudes in strong magnetic field regions of the network. The resulting inhomogeneous radiation and temperature distribution produces bulk flows, which in turn affect the configuration of the magnetic field. The basic flow pattern is circulation on the spatial scale of a supergranule, with upward flow in the strong-field region; this is a mirror image in the upper chromosphere of photospheric/subphotospheric convection widely associated with the formation of the strong network field. There are significant differences between the neutral and the ionized components of the weakly ionized medium: neutral flow streamlines can form closed cells, whereas plasma is largely constrained to flow along the magnetic field. Stresses associated with this differential flow may explain why the canopy/funnel structures of the network magnetic field have a greater horizontal extent and are relatively more homogeneous at high altitudes than is expected from simple current-free models.

  16. Constraints on helium enhancement in the globular cluster M4 (NGC 6121): The horizontal branch test

    SciTech Connect (OSTI)

    Valcarce, A. A. R.; De Medeiros, J. R.; Catelan, M.; Alonso-García, J.; Cortés, C.

    2014-02-20

    Recent pieces of evidence have revealed that most, and possibly all, globular star clusters are composed of groups of stars that formed in multiple episodes with different chemical compositions. In this sense, it has also been argued that variations in the initial helium abundance (Y) from one population to the next are also the rule, rather than the exception. In the case of the metal-intermediate globular cluster M4 (NGC 6121), recent high-resolution spectroscopic observations of blue horizontal branch (HB) stars (i.e., HB stars hotter than the RR Lyrae instability strip) suggest that a large fraction of blue HB stars are second-generation stars formed with high helium abundances. In this paper, we test this scenario by using recent photometric and spectroscopic data together with theoretical evolutionary computations for different Y values. Comparing the photometric data with the theoretically derived color-magnitude diagrams, we find that the bulk of the blue HB stars in M4 have ?Y ? 0.01 with respect to the cluster's red HB stars (i.e., HB stars cooler than the RR Lyrae strip)—a result which is corroborated by comparison with spectroscopically derived gravities and temperatures, which also favor little He enhancement. However, the possible existence of a minority population on the blue HB of the cluster with a significant He enhancement level is also discussed.

  17. Advanced Horizontal Well Recirculation Systems for Geothermal Energy Recovery in Sedimentary Formations

    SciTech Connect (OSTI)

    Mike Bruno; Russell L. Detwiler; Kang Lao; Vahid Serajian; Jean Elkhoury; Julia Diessl; Nicky White

    2012-09-30

    There is increased recognition that geothermal energy resources are more widespread than previously thought, with potential for providing a significant amount of sustainable clean energy worldwide. Recent advances in drilling, completion, and production technology from the oil and gas industry can now be applied to unlock vast new geothermal resources, with some estimates for potential electricity generation from geothermal energy now on the order of 2 million megawatts. Terralog USA, in collaboration with the University of California, Irvine (UCI), are currently investigating advanced design concepts for paired horizontal well recirculation systems, optimally configured for geothermal energy recovery in permeable sedimentary and crystalline formations of varying structure and material properties. This two-year research project, funded by the US Department of Energy, includes combined efforts for: 1) Resource characterization; 2) Small and large scale laboratory investigations; 3) Numerical simulation at both the laboratory and field scale; and 4) Engineering feasibility studies and economic evaluations. The research project is currently in its early stages. This paper summarizes our technical approach and preliminary findings related to potential resources, small-scale laboratory simulation, and supporting numerical simulation efforts.

  18. Horizontal-flow anaerobic immobilized sludge (HAIS) reactor for paper industry wastewater treatment

    SciTech Connect (OSTI)

    Foresti, E.; Cabral, A.K.A.; Zaiat, M.; Del Nery, V.

    1996-11-01

    Immobilized cell reactors are known to permit the continuous operation without biomass washout and also for increasing the time available for cells` catalytic function in a reaction or in a series of reactions. Several cell immobilization supports have been used in different reactors for anaerobic wastewater treatment, such as: agar gel, acrylamide, porous ceramic, and polyurethane foam besides the self-immobilized biomass from UASB reactors. However, the results are not conclusive as to the advantages of these different reactors with different supports as compared to other anaerobic reactor configurations. This paper describes a new anaerobic attached growth reactor configuration, herein referred as horizontal-flow anaerobic immobilized sludge (HAIS) reactor and presents the results of its performance test treating kraft paper industry wastewater. The reactor configuration was conceived aiming to increase the ratio useful volume/total volume by lowering the volume for gas separation. The HAIS reactor conception would permit also to incorporate the reactor hydrodynamic characteristics in its design criteria if the flow pattern could be approximated as plug-flow.

  19. Comparison of optically measured and radar-derived horizontal neutral winds. Master's thesis

    SciTech Connect (OSTI)

    Christie, M.S.

    1990-01-01

    Nighttime thermospheric winds for Sondrestrom, Greenland from 11 nights between 1983 and 1988, have been compared to learn about the O(+)-O collision cross section and the high-latitude atomic oxygen density. The horizontal winds in the magnetic meridian were derived indirectly from incoherent-scatter radar (ISR) measurements on ion velocities antiparallel to the magnetic field and directly from Fabry-Perot interferometer (FPI) measurements of Doppler shifts of the (6300-A) emission of atomic oxygen. In deriving the radar winds, the O(+)-O collision cross section, was scaled by a factor of f what was varied from 0.5 to 5.1. On the basis of several arguments the altitude of the 6300-A emission was assumed to be 230 km. The best agreement between the ISR and FPI winds was obtained when f was increased substantially, to between 1.7 and 3.4. If the average peak emission altitude were higher, these factors would be larger; if it were lower, they would be somewhat smaller. However, if the average altitude were substantially lower it would have been more difficult to have obtained agreement between the two techniques.

  20. Influence of vertical channel change associated with wood accumulations on delineating channel migration zones,

    E-Print Network [OSTI]

    Montgomery, David R.

    debris (LWD); Logjam; Channel avulsion 1. Introduction The interaction of large woody debris (LWD., 2001). Larger, unconfined river systems are capable of organizing LWD into stable structures that can

  1. Transmission Policies for Asymmetric Interference Channels with Energy Harvesting Nodes

    E-Print Network [OSTI]

    Yener, Aylin

    Transmission Policies for Asymmetric Interference Channels with Energy Harvesting Nodes Kaya power policies to maximize sum capacity in an energy harvesting setting. It is shown derive optimal power allocation policies for interference channels comprised of energy harvesting

  2. Evaluating demand planning strategy in the retail channel

    E-Print Network [OSTI]

    Zehavi, Limor (Limor Hadas)

    2012-01-01

    In 2007 Dell began selling through the retail channel. Five years later, the retail channel is still in the early stages relative to competitors and is growing rapidly. Short product lifecycles, long lead times and a high ...

  3. Bedrock channel response to tetonic, climatic and eustatic forcings

    E-Print Network [OSTI]

    Snyder, Noah P

    2001-01-01

    The response of bedrock channels to external forcings is investigated in this thesis. The approach is to test and constrain a theoretical model for bedrock-channel incision based on shear stress using field data. The primary ...

  4. Defending against side-channel attacks : DynamoREA

    E-Print Network [OSTI]

    Wen, David, M. Eng. (David Y.). Massachusetts Institute of Technology

    2011-01-01

    Modern computer architectures are prone to leak information about their applications through side-channels caused by micro-architectural side-effects. Through these side-channels, attackers can launch timing attacks by ...

  5. Queueing Behavior over a Gilbert-Elliott Packet Erasure Channel 

    E-Print Network [OSTI]

    Cai, Yi

    2012-02-14

    This thesis explores the queueing performance of a wireless communication system that transmits packets over a correlated erasure channel using the IEEE 802.11 protocol suit. The channel states and the queue length together form a Markov chain...

  6. Adaptive versus nonadaptive strategies for quantum channel discrimination

    E-Print Network [OSTI]

    Harrow, Aram W.

    We provide a simple example that illustrates the advantage of adaptive over nonadaptive strategies for quantum channel discrimination. In particular, we give a pair of entanglement-breaking channels that can be perfectly ...

  7. Fabrication of 10 nm enclosed nanofluidic channels and Zhaoning Yu

    E-Print Network [OSTI]

    - tively large planar surfaces and provide an effective seal. Wafer bonding requires an absolutely defect-density arrays of nanofluidic channels were first fabricated using NIL. The NIL mold was generated channels on the mold generated

  8. Gallager's exponent for MIMO channels: A reliability-rate tradeoff

    E-Print Network [OSTI]

    Shin, Hyundong

    In this paper, we derive Gallager's random coding error exponent for multiple-input multiple-output (MIMO) Rayleigh block-fading channels, assuming no channel-state information (CSI) at the transmitter and perfect CSI at ...

  9. Analysis of global channel costs for the pharmaceutical industry

    E-Print Network [OSTI]

    Rimling, Eric C. (Eric Christopher)

    2009-01-01

    The pharmaceutical industry creates products which often have more than one supply chain channel, defined as a route through the supply chain network from sourcing to the end market. Each channel's specific cost characteristics ...

  10. Channel Meander Migration in Large-Scale Physical Model Study 

    E-Print Network [OSTI]

    Yeh, Po Hung

    2010-10-12

    A set of large-scale laboratory experiments were conducted to study channel meander migration. Factors affecting the migration of banklines, including the ratio of curvature to channel width, bend angle, and the Froude number were tested...

  11. Variations on the Gaussian Multiple-Access Channel Alfonso Martinez

    E-Print Network [OSTI]

    energy channel (AE-Q). The alternative models we study are non-coherent, in the sense that information channel, including a multiple-access sce- nario, was studied by Verd´u [1]. We establish a correspondence

  12. Mathematical approach to channel codes with a diagonal matrix structure 

    E-Print Network [OSTI]

    Mitchell, David G. M.

    2009-01-01

    Digital communications have now become a fundamental part of modern society. In communications, channel coding is an effective way to reduce the information rate down to channel capacity so that the information can be ...

  13. Adaptive versus non-adaptive strategies for quantum channel discrimination

    E-Print Network [OSTI]

    Aram W. Harrow; Avinatan Hassidim; Debbie W. Leung; John Watrous

    2009-09-01

    We provide a simple example that illustrates the advantage of adaptive over non-adaptive strategies for quantum channel discrimination. In particular, we give a pair of entanglement-breaking channels that can be perfectly discriminated by means of an adaptive strategy that requires just two channel evaluations, but for which no non-adaptive strategy can give a perfect discrimination using any finite number of channel evaluations.

  14. Free Online Training on the DVU Learning Channel!

    Broader source: Energy.gov [DOE]

    Free online courses are now available through the DOE Virtual University (DVU) website on the new DVU Learning Channel

  15. Stochastic Wireless Channel Modeling, Estimation and Identification from Measurements

    SciTech Connect (OSTI)

    Olama, Mohammed M [ORNL; Djouadi, Seddik M [ORNL; Li, Yanyan [ORNL

    2008-07-01

    This paper is concerned with stochastic modeling of wireless fading channels, parameter estimation, and system identification from measurement data. Wireless channels are represented by stochastic state-space form, whose parameters and state variables are estimated using the expectation maximization algorithm and Kalman filtering, respectively. The latter are carried out solely from received signal measurements. These algorithms estimate the channel inphase and quadrature components and identify the channel parameters recursively. The proposed algorithm is tested using measurement data, and the results are presented.

  16. TRP channels as cellular sensors David E. Clapham

    E-Print Network [OSTI]

    Gunawardena, Jeremy

    of a battery. Small conformational changes cause channels to open, allowing over ten million ions to flow per

  17. On The Outage Capacity Distribution of Correlated Keyhole MIMO Channels

    E-Print Network [OSTI]

    Loyka, Sergey

    On The Outage Capacity Distribution of Correlated Keyhole MIMO Channels G. Levin and S. Loyka for the instantaneous SNR and outage capacity distributions of a spatially correlated keyhole MIMO channel are given diversity channel with a single Tx (Rx) and multiple Rx (Tx) antennas. The outage capacity at low outage

  18. Multipath channels Path timing critical (versus amplitude information)

    E-Print Network [OSTI]

    Southern California, University of

    1 · Multipath channels · Path timing critical (versus amplitude information) ­ Certain modulations: PPM ­ Location/Ranging · Model ­ Delay spread ­ L paths (M choose L possible profiles) ­ Independent path amplitudes ­ Block constant channel ­ AW GN 0 100 200 300 400 500 600 -0.02 0 0.02 The Channel

  19. Concurrent signal combining and channel estimation in digital communications

    DOE Patents [OSTI]

    Ormesher, Richard C. (Albuquerque, NM); Mason, John J. (Albuquerque, NM)

    2011-08-30

    In the reception of digital information transmitted on a communication channel, a characteristic exhibited by the communication channel during transmission of the digital information is estimated based on a communication signal that represents the digital information and has been received via the communication channel. Concurrently with the estimating, the communication signal is used to decide what digital information was transmitted.

  20. COOPERATIVE SOURCE AND CHANNEL CODING FOR WIRELESS VIDEO TRANSMISSION

    E-Print Network [OSTI]

    Erkip, Elza

    COOPERATIVE SOURCE AND CHANNEL CODING FOR WIRELESS VIDEO TRANSMISSION Hoi Yin Shutoy, Yao Wang substantial improvement in channel reliability through cooperative transmission strategies. To exploit this benefit for video transmission, we propose to jointly allocate bits among video coding, channel coding

  1. Transmission Strategies for Correlated MIMO Links with Imperfect Channel Estimates

    E-Print Network [OSTI]

    Yener, Aylin

    Transmission Strategies for Correlated MIMO Links with Imperfect Channel Estimates Semih Serbetli for channel estimation versus data transmission. The optimum power allocation problem between the training sequences for channel estimation and data transmission for the correlated MIMO link is shown to have

  2. Adaptive versus non-adaptive strategies for quantum channel discrimination

    E-Print Network [OSTI]

    Watrous, John

    Adaptive versus non-adaptive strategies for quantum channel discrimination Aram W. Harrow Avinatan-adaptive strategies for quantum channel discrimination. In particular, we give a pair of entanglement- breaking channels that can be perfectly discriminated by means of an adaptive strategy that re- quires just two

  3. Improved Capacity Bounds for the Binary Energy Harvesting Channel

    E-Print Network [OSTI]

    Yener, Aylin

    Improved Capacity Bounds for the Binary Energy Harvesting Channel Kaya Tutuncuoglu1 , Omur Ozel2 the encoder has unit energy storage capacity. We first show that an encoding scheme based on block indexing/channel use. The capacity of additive white Gaussian noise (AWGN) energy harvesting channel was studied in [2

  4. Microwave Radiometer – 3 Channel (MWR3C) Handbook

    SciTech Connect (OSTI)

    Cadeddu, MP

    2012-05-04

    The microwave radiometer 3-channel (MWR3C) provides time-series measurements of brightness temperatures from three channels centered at 23.834, 30, and 89 GHz. These three channels are sensitive to the presence of liquid water and precipitable water vapor.

  5. Adaptive Modulation and Scheduling of IP traffic over Fading Channels

    E-Print Network [OSTI]

    the traf- fic load. An obstacle in this context is the time-variability of the channel. To achieve a high to the traffic situation. 1 INTRODUCTION Fading channels confront us with the problem of lost packets. For a predicted value of the Signal to Noise and Interfer- ence Ratio (SNIR) of each channel, the modulation level

  6. Adaptive Modulation and Scheduling of IP traffic over Fading Channels

    E-Print Network [OSTI]

    the traf­ fic load. An obstacle in this context is the time­variability of the channel. To achieve a high to the traffic situation. 1 INTRODUCTION Fading channels confront us with the problem of lost packets. For a predicted value of the Signal to Noise and Interfer­ ence Ratio (SNIR) of each channel, the modulation level

  7. Renewable Energy Scheduling for Fading Channels with Maximum Power Constraint

    E-Print Network [OSTI]

    Greenberg, Albert

    Renewable Energy Scheduling for Fading Channels with Maximum Power Constraint Zhe Wang Electrical--In this paper, we develop efficient algorithm to obtain the optimal energy schedule for fading channel with energy harvesting. We assume that the side information of both the channel states and energy harvesting

  8. Turbulent heat transfer and friction in a segmental channel that simulates leading-edge cooling channels of modern turbine blades 

    E-Print Network [OSTI]

    Spence, Rodney Brian

    1995-01-01

    Experiments are conducted to study the effects of channel geometry and asymmetric heating on the heat transfer and friction characteristics of turbulent flows in leading edge cooling channels in stator blades of gas turbines. The leading edge...

  9. Demand based State Aware Channel Reconfiguration Algorithm for Multi-Channel Multi-Radio Wireless Mesh Networks 

    E-Print Network [OSTI]

    Balachandran, Athula; Franklin, A A; Siva Ram Murthy, C.; Marina, Mahesh

    Efficient utilization of Multi Channel - Multi Radio (MC-MR) Wireless Mesh Networks (WMNs) can be achieved only by intelligent Channel Assignment (CA) and Link Scheduling (LS). Due to the dynamic nature of traffic demand ...

  10. A Method of Correcting for Tilt From Horizontal in Downwelling Shortwave Irradiance Measurements on Moving Platforms

    SciTech Connect (OSTI)

    Long, Charles N.; Bucholtz, Anthony; Jonsson, Haf; Schmid, Beat; Vogelmann, A. M.; Wood, John

    2010-04-14

    Significant errors occur in downwelling shortwave irradiance measurements made on moving platforms due to tilt from horizontal because, when the sun is not completely blocked by overhead cloud, the downwelling shortwave irradiance has a prominent directional component from the direct sun. A-priori knowledge of the partitioning between the direct and diffuse components of the total shortwave irradiance is needed to properly apply a correction for tilt. This partitioning information can be adequately provided using a newly available commercial radiometer that produces reasonable measurements of the total and diffuse shortwave irradiance, and by subtraction the direct shortwave irradiance, with no moving parts and regardless of azimuthal orientation. We have developed methodologies for determining the constant pitch and roll offsets of the radiometers for aircraft applications, and for applying a tilt correction to the total shortwave irradiance data. Results suggest that the methodology is for tilt up to +/-10°, with 90% of the data corrected to within 10 Wm-2 at least for clear-sky data. Without a proper tilt correction, even data limited to 5° of tilt as is typical current practice still exhibits large errors, greater than 100 Wm-2 in some cases. Given the low cost, low weight, and low power consumption of the SPN1 total and diffuse radiometer, opportunities previously excluded for moving platform measurements such as small Unmanned Aerial Vehicles and solar powered buoys now become feasible using our methodology. The increase in measurement accuracy is important, given current concerns over long-term climate variability and change especially over the 70% of the Earth’s surface covered by ocean where long-term records of these measurements are sorely needed and must be made on ships and buoys.

  11. Mixed convection transport from an isolated heat source module on a horizontal plate

    SciTech Connect (OSTI)

    Kang, B.H.; Jaluria, Y.; Tewari, S.S. )

    1990-08-01

    An experimental study of the mixed convective heat transfer from an isolated source of finite thickness, located on a horizontal surface in an externally induced forced flow, has been carried out. This problem is of particular interest in the cooling of electronic components and also in the thermal transport associated with various manufacturing systems, such as ovens and furnaces. The temperature distribution in the flow as well as the surface temperature variation are studied in detail. The dependence of the heat transfer rate on the mixed convection parameter and on the thickness of the heated element or source, particularly in the vicinity of the source, is investigated. The results obtained indicate that the heat transfer rate and fluid flow characteristics vary strongly with the mixed convection variables. The transition from a natural convection dominated flow to a forced convection dominated flow is studied experimentally and the basic characteristics of the two regimes determined. This transition has a strong influence on the temperature of the surface and on the heat transfer rate. As expected, the forced convection dominated flow is seen to be significantly more effective in the cooling of a heat dissipating component than a natural convection dominated flow. The location of the maximum temperature on the module surface, which corresponds to the minimum local heat transfer coefficient, is determined and discussed in terms of the underlying physical mechanisms. The results obtained are also compared with these for an element of negligible thickness and the effect of a significant module thickness on the transport is determined. Several other important aspects of fundamental and applied interest are studied in this investigation.

  12. Mixed convection heat transfer from thermal sources mounted on horizontal and vertical surfaces

    SciTech Connect (OSTI)

    Tewari, S.S.; Jaluria, Y. )

    1990-11-01

    An experimental study is carried out on the fundamental aspects of the conjugate, mixed convective heat transfer from two finite width heat sources, which are of negligible thickness, have a uniform heat flux input at the surface, and are located on a flat plate in a horizontal or the vertical orientation. The heat sources are wide in the transverse direction and, therefore, a two-dimensional flow circumstance is simulated. The mixed convection parameter is varied over a fairly wide range to include the buoyancy-dominated and the mixed convection regimes. The circumstances of pure natural convection are also investigated. The convective mechanisms have been studied in detail by measuring the surface temperatures and determining the heat transfer coefficients for the two heated strips, which represent isolated thermal sources. Experimental results indicate that a stronger upstream heat source causes an increase in the surface temperature of a relatively weaker heat source, located downstream, by reducing it convective heat transfer coefficient. The influence of the upstream source is found to be strongly dependent on the surface orientation, especially in the pure natural convection and the buoyancy dominated regimes. The two heat sources are found to be essentially independent on the surface orientation, especially in the pure natural convection and the buoyancy dominated regimes. The two heat sources are found to be essentially independent of each other, in terms of thermal effects, at a separation distance of more than about three strip widths for both the orientations. The results obtained are relevant to many engineering applications, such as the cooling of electronic systems, positioning of heating elements in furnaces, and safety considerations in enclosure fires.

  13. Generalized models and benchmarks for channel coordination 

    E-Print Network [OSTI]

    Toptal, Aysegul

    2004-09-30

    Models and Benchmarks for Channel Coordination. (August 2003) Ay¸ ¨ Toptal, B.S., Bilkent University, Turkey; M.S., Bilkent University, Turkey Chair of Advisory Committee: Dr. Sõla Cetinkaya This dissertation takes into account the latest industrial... of the Idea Behind Algorithm 3 . . . . . . . . . . . 58 12 Illustration of the Cost and Material Flows . . . . . . . . . . . . . 89 13 Illustration of Piv(Q) when (c -p)Pv > Rv . . . . . . . . . . . . . . 121 14 Different illustrations of Piv...

  14. Computational optimization of synthetic water channels.

    SciTech Connect (OSTI)

    Rogers, David Michael; Rempe, Susan L. B.

    2012-12-01

    Membranes for liquid and gas separations and ion transport are critical to water purification, osmotic energy generation, fuel cells, batteries, supercapacitors, and catalysis. Often these membranes lack pore uniformity and robustness under operating conditions, which can lead to a decrease in performance. The lack of uniformity means that many pores are non-functional. Traditional membranes overcome these limitations by using thick membrane materials that impede transport and selectivity, which results in decreased performance and increased operating costs. For example, limitations in membrane performance demand high applied pressures to deionize water using reverse osmosis. In contrast, cellular membranes combine high flux and selective transport using membrane-bound protein channels operating at small pressure differences. Pore size and chemistry in the cellular channels is defined uniformly and with sub-nanometer precision through protein folding. The thickness of these cellular membranes is limited to that of the cellular membrane bilayer, about 4 nm thick, which enhances transport. Pores in the cellular membranes are robust under operating conditions in the body. Recent efforts to mimic cellular water channels for efficient water deionization produced a significant advance in membrane function. The novel biomimetic design achieved a 10-fold increase in membrane permeability to water flow compared to commercial membranes and still maintained high salt rejection. Despite this success, there is a lack of understanding about why this membrane performs so well. To address this lack of knowledge, we used highperformance computing to interrogate the structural and chemical environments experienced by water and electrolytes in the newly created biomimetic membranes. We also compared the solvation environments between the biomimetic membrane and cellular water channels. These results will help inform future efforts to optimize and tune the performance of synthetic biomimetic membranes for applications in water purification, energy, and catalysis.

  15. Scripps Channel 1 | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page onRAPID/Geothermal/Exploration/ColoradoRemsenburg-Speonk,SageScheuco InternationalScottScripps Channel 1 Jump to:

  16. Evaluation of ambient dose equivalent rates influenced by vertical and horizontal distribution of radioactive cesium in soil in Fukushima Prefecture

    E-Print Network [OSTI]

    Malins, Alex; Nakama, Shigeo; Saito, Tatsuo; Okumura, Masahiko; Machida, Masahiko; Kitamura, Akihiro

    2015-01-01

    The air dose rate in an environment contaminated with 134Cs and 137Cs depends on the amount, depth profile and horizontal distribution of these contaminants within the ground. This paper introduces and verifies a tool that models these variables and calculates ambient dose equivalent rates at 1 m above the ground. Good correlation is found between predicted dose rates and dose rates measured with survey meters in Fukushima Prefecture in areas contaminated with radiocesium from the Fukushima Dai-ichi Nuclear Power Plant accident. This finding is insensitive to the choice for modelling the activity depth distribution in the ground using activity measurements of collected soil layers, or by using exponential and hyperbolic secant fits to the measurement data. Better predictions are obtained by modelling the horizontal distribution of radioactive cesium across an area if multiple soil samples are available, as opposed to assuming a spatially homogeneous contamination distribution. Reductions seen in air dose rate...

  17. Atmospheric Test Models and Numerical Experiments for the Simulation of the Global Distributions of Weather Data Transponders III. Horizontal Distributions

    SciTech Connect (OSTI)

    Molenkamp, C.R.; Grossman, A.

    1999-12-20

    A network of small balloon-borne transponders which gather very high resolution wind and temperature data for use by modern numerical weather predication models has been proposed to improve the reliability of long-range weather forecasts. The global distribution of an array of such transponders is simulated using LLNL's atmospheric parcel transport model (GRANTOUR) with winds supplied by two different general circulation models. An initial study used winds from CCM3 with a horizontal resolution of about 3 degrees in latitude and longitude, and a second study used winds from NOGAPS with a 0.75 degree horizontal resolution. Results from both simulations show that reasonable global coverage can be attained by releasing balloons from an appropriate set of launch sites.

  18. Tectonic "short circuit" of sub-horizontal fluid-saturated bodies as a possible mechanism of the earthquake

    E-Print Network [OSTI]

    Andrei Nechayev

    2013-07-18

    An alternative earthquake mechanism is proposed. The traditional stress mechanism of fracture formation assigned a support role. As a proximate cause of the earthquake the destruction of the roofs of sub-horizontal fluid-saturated bodies (SHFB) is considered. This collapse may occur due to redistribution of fluid pressure within the system of SHFB connected by cracks (tectonic or other nature). It can cause both shifts of rock blocks contributing to seismic shocks and various effects characteristic of foreshocks and aftershocks.

  19. Recovery of bypassed oil in the Dundee Formation using horizontal drains. Annual report, April 1994--June 1995

    SciTech Connect (OSTI)

    Wood, J.

    1995-08-01

    Crystal Field in Montcalm County, MI, was selected as a field trial site for this project. Analysis of production data for Crystal Field suggests that an additional 200,000 bbls of oil can be produced using one strategically located horizontal well. Total addition production from the Crystal Field could be as much as 6--8 MMBO. Application of the technology developed in this project to other Dundee fields in the area has the potential to increase Dundee production in Michigan by 35%, adding 80--100 MMBO to ultimate recovery. This project will demonstrate through a field trial that horizontal wells can be substantially increase oil production in older reservoirs that are at or near their economic limit. To maximize the potential of the horizontal well and to ensure that a comprehensive evaluation can be made, extensive reservoir characterization will be performed. In addition to the proposed field trial at Crystal Field, 29 additional Dundee fields in a seven-county area have been selected for study in the reservoir characterization portion of this project.

  20. Role of horizontal gene transfer as a control on the coevolution of ribosomal proteins and the genetic code

    SciTech Connect (OSTI)

    Woese, Carl R.; Goldenfeld, Nigel; Luthey-Schulten, Zaida

    2011-03-31

    Our main goal is to develop the conceptual and computational tools necessary to understand the evolution of the universal processes of translation and replication and to identify events of horizontal gene transfer that occurred within the components. We will attempt to uncover the major evolutionary transitions that accompanied the development of protein synthesis by the ribosome and associated components of the translation apparatus. Our project goes beyond standard genomic approaches to explore homologs that are represented at both the structure and sequence level. Accordingly, use of structural phylogenetic analysis allows us to probe further back into deep evolutionary time than competing approaches, permitting greater resolution of primitive folds and structures. Specifically, our work focuses on the elements of translation, ranging from the emergence of the canonical genetic code to the evolution of specific protein folds, mediated by the predominance of horizontal gene transfer in early life. A unique element of this study is the explicit accounting for the impact of phenotype selection on translation, through a coevolutionary control mechanism. Our work contributes to DOE mission objectives through: (1) sophisticated computer simulation of protein dynamics and evolution, and the further refinement of techniques for structural phylogeny, which complement sequence information, leading to improved annotation of genomic databases; (2) development of evolutionary approaches to exploring cellular function and machinery in an integrated way; and (3) documentation of the phenotype interaction with translation over evolutionary time, reflecting the system response to changing selection pressures through horizontal gene transfer.

  1. Energy conversion device with support member having pore channels

    DOE Patents [OSTI]

    Routkevitch, Dmitri [Longmont, CO; Wind, Rikard A [Johnstown, CO

    2014-01-07

    Energy devices such as energy conversion devices and energy storage devices and methods for the manufacture of such devices. The devices include a support member having an array of pore channels having a small average pore channel diameter and having a pore channel length. Material layers that may include energy conversion materials and conductive materials are coaxially disposed within the pore channels to form material rods having a relatively small cross-section and a relatively long length. By varying the structure of the materials in the pore channels, various energy devices can be fabricated, such as photovoltaic (PV) devices, radiation detectors, capacitors, batteries and the like.

  2. CHANNEL MORPHOLOGY TOOL (CMT): A GIS-BASED AUTOMATED EXTRACTION MODEL FOR CHANNEL GEOMETRY

    SciTech Connect (OSTI)

    JUDI, DAVID; KALYANAPU, ALFRED; MCPHERSON, TIMOTHY; BERSCHEID, ALAN

    2007-01-17

    This paper describes an automated Channel Morphology Tool (CMT) developed in ArcGIS 9.1 environment. The CMT creates cross-sections along a stream centerline and uses a digital elevation model (DEM) to create station points with elevations along each of the cross-sections. The generated cross-sections may then be exported into a hydraulic model. Along with the rapid cross-section generation the CMT also eliminates any cross-section overlaps that might occur due to the sinuosity of the channels using the Cross-section Overlap Correction Algorithm (COCoA). The CMT was tested by extracting cross-sections from a 5-m DEM for a 50-km channel length in Houston, Texas. The extracted cross-sections were compared directly with surveyed cross-sections in terms of the cross-section area. Results indicated that the CMT-generated cross-sections satisfactorily matched the surveyed data.

  3. Channeling and dechanneling at high energy

    SciTech Connect (OSTI)

    Carrigan, R.A. Jr.

    1987-09-30

    The possibility of using channeling as a tool for high energy particle physics has now been extensively investigated. Bent crystals have been used as an accelerator extraction element and for particle deflection. Applications as accelerating devices have been discussed but appear remote. The major advantage in using a bent crystal rather than a magnet is the large deflection that can be achieved in a short length. The major disadvantage is the low transmission. A good understanding of dechanneling is important for applications. 43 refs., 1 fig., 3 tabs.

  4. A 64 channel VME transient recorder module

    SciTech Connect (OSTI)

    Rodrigues, A.M.P.; Batista, A.J.N.; Sousa, J.; Varandas, C.A.F. [Centro de Fusao Nuclear, Lisboa (Portugal)] [Centro de Fusao Nuclear, Lisboa (Portugal); Basilio Simoes, J.; Correia, C.M.B.A. [Univ. de Coimbra (Portugal). Dept. de Fisica] [Univ. de Coimbra (Portugal). Dept. de Fisica

    1996-02-01

    This paper describes an inexpensive and innovative VME transient recorder module, with 64 multiplexed analog input channels, 12-bit resolution, sampling rate up to 666 kSPS and 2 MWords of local memory providing standalone operation capability. This module was developed for the operation control of the tokamak ISTTOK. Its architecture takes advantage of the large scale integration and improved dynamic performance of recently developed devices. The main operational features are described and methods for assessing the performance are discussed. The experimental results already obtained as well as the philosophy of operation and programmability of this module suggest its adequacy to the monitoring of a large and complex nuclear physics experiment.

  5. Carderock Circulating Water Channel | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION J APPENDIX ECoopButte County,Camilla, Georgia: Energy ResourcesRanchCirculating Water Channel Jump

  6. Combustion Assisted Gravity Drainage (CAGD): An In-Situ Combustion Method to Recover Heavy Oil and Bitumen from Geologic Formations using a Horizontal Injector/Producer Pair 

    E-Print Network [OSTI]

    Rahnema, Hamid

    2012-11-21

    Combustion assisted gravity drainage (CAGD) is an integrated horizontal well air injection process for recovery and upgrading of heavy oil and bitumen from tar sands. Short-distance air injection and direct mobilized oil production are the main...

  7. An experimental study of the buckling behavior and frictional effects of a circular rod laterally constrained within a horizontal circular cylinder 

    E-Print Network [OSTI]

    Williams, Thomas H.

    1995-01-01

    This thesis is the result of an experimental study of the post buckling frictional effects of a circular rod laterally constrained within a horizontal circular cylinder. Previous theoretical works by Chen, Wu, and Cheatam ...

  8. Dartmouth Stellar Evolution Database and the ACS Survey of Galactic Globular Clusters II. Stellar Evolution Tracks, Isochrones, Luminosity Functions, and Synthetic Horizontal-Branch Models

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Dotter, A; Chaboyer, B; Jevremovic, D; Kostov, V; Baron, E; Ferguson, J; Sarajedini, A; Anderson, J

    Web tools are also available at the home page (http://stellar.dartmouth.edu/~models/index.html). These tools allow users to create isochrones and convert them to luminosity functions or create synthetic horizontal branch models.

  9. The Method of Distributed Volumetric Sources for Forecasting the Transient and Pseudo-steady State Productivity of Multiple Transverse Fractures Intersected by a Horizontal Well 

    E-Print Network [OSTI]

    Fan, Diangeng

    2011-02-22

    horizontal well intercepted by multiple transverse fractures in a bounded reservoir, and it also provides well-testing solutions. The well performance model is designed to provide enhanced efficiency with the same reliability for pressure transient analysis...

  10. Distributed Channel Probing for Efficient Transmission Scheduling Over Wireless Fading Channels

    E-Print Network [OSTI]

    Eryilmaz, Atilla

    a natural tradeoff between exploring the multi-user diversity and energy consumption for channel acquisition develop a similar MWS-type algorithm that minimizes the energy consumption. However, the resulting Li and Atilla Eryilmaz Abstract--It is energy-consuming and operationally cumber- some for all users

  11. Reinvestigating Channel Orthogonality -Adjacent Channel Interference in IEEE 802.11n Networks

    E-Print Network [OSTI]

    .11 with a focus on new 802.11n standard. ACI is causing problems that are related to the carrier sensing mechanism,sombrutz}@informatik.hu-berlin.de Abstract--In this paper we analyze the adverse effects of Adjacent Channel Interference (ACI) on 802 effect of ACI can be reduced in two ways. First, by increasing the spatial separation between the radios

  12. Magnets for Muon 6D Cooling Channels

    SciTech Connect (OSTI)

    Johnson, Rolland; Flanagan, Gene

    2014-09-10

    The Helical Cooling Channel (HCC), an innovative technique for six-dimensional (6D) cooling of muon beams using a continuous absorber inside superconducting magnets, has shown considerable promise based on analytic and simulation studies. The implementation of this revolutionary method of muon cooling requires high field superconducting magnets that provide superimposed solenoid, helical dipole, and helical quadrupole fields. Novel magnet design concepts are required to provide HCC magnet systems with the desired fields for 6D muon beam cooling. New designs feature simple coil configurations that produce these complex fields with the required characteristics, where new high field conductor materials are particularly advantageous. The object of the program was to develop designs and construction methods for HCC magnets and design a magnet system for a 6D muon beam cooling channel. If successful the program would develop the magnet technologies needed to create bright muon beams for many applications ranging from scientific accelerators and storage rings to beams to study material properties and new sources of energy. Examples of these applications include energy frontier muon colliders, Higgs and neutrino factories, stopping muon beams for studies of rare fundamental interactions and muon catalyzed fusion, and muon sources for cargo screening for homeland security.

  13. Field Demonstration of Horizontal Infill Drilling Using Cost-effective Integrated Reservoir Modeling--Mississippian Carbonates, Central Kansas

    SciTech Connect (OSTI)

    Saibal Bhattacharya

    2005-08-31

    Mississippian carbonate reservoirs have produced in excess of 1 billion barrels of oil in Kansas accounting for over 16% of the state's production. With declining production from other age reservoirs, the contribution of Mississippian reservoirs to Kansas's oil production has risen to 43% as of 2004. However, solution-enhanced features such as vertical shale intervals extending from the karst erosional surface at the top introduce complexities/compartmentalizations in Mississippian carbonate reservoirs. Coupled with this, strong water drives charge many of these reservoirs resulting in limited drainage from vertical wells due to high water cuts after an initial period of low water production. Moreover, most of these fields are operated by small independent operators without access to the knowledge bank of modern research in field characterization and exploitation/development practices. Thus, despite increasing importance of Mississippian fields to Kansas production, these fields are beset with low recovery factors and high abandonment rates leaving significant resources in the ground. Worldwide, horizontal infill wells have been successful in draining compartmentalized reservoirs with limited pressure depletion. The intent of this project was to demonstrate the application of horizontal wells to successfully exploit the remaining potential in mature Mississippian fields of the mid-continent. However, it is of critical importance that for horizontal wells to be economically successful, they must be selectively targeted. This project demonstrated the application of initial and secondary screening methods, based on publicly available data, to quickly shortlist fields in a target area for detailed studies to evaluate their potential to infill horizontal well applications. Advanced decline curve analyses were used to estimate missing well-level production data and to verify if the well produced under unchanging bottom-hole conditions--two commonly occurring data constraints afflicting mature Mississippian fields. A publicly accessible databank of representative petrophysical properties and relationships was developed to overcome the paucity of such data that is critical to modeling the storage and flow in these reservoirs. Studies in 3 Mississippian fields demonstrated that traditional reservoir models built by integrating log, core, DST, and production data from existing wells on 40-acre spacings are unable to delineate karst-induced compartments, thus making 3D-seismic data critical to characterize these fields. Special attribute analyses on 3D data were shown to delineate reservoir compartments and predict those with pay porosities. Further testing of these techniques is required to validate their applicability in other Mississippian reservoirs. This study shows that detailed reservoir characterization and simulation on geomodels developed by integrating wireline log, core, petrophysical, production and pressure, and 3D-seismic data enables better evaluation of a candidate field for horizontal infill applications. In addition to reservoir compartmentalization, two factors were found to control the economic viability of a horizontal infill well in a mature Mississippian field: (a) adequate reservoir pressure support, and (b) an average well spacing greater than 40-acres.

  14. Juvenile Chinook salmon (Oncorhynchus tshawytscha) growth in off-channel and main-channel habitats on the Sacramento River, CA using otolith increment widths

    E-Print Network [OSTI]

    Limm, Michael P.; Marchetti, Michael P.

    2009-01-01

    in both off- channel ponds and non- natal seasonalet al. 2001), off-channel ponds (e.g. Peterson 1982), natalriverine areas, off-channel ponds, and non-natal seasonal

  15. Mechanosensitive Channel Activation by Diffusio-Osmotic Force

    E-Print Network [OSTI]

    Bonthuis, Douwe Jan

    2014-01-01

    For ion channel gating, the appearance of two distinct conformational states and the discrete transitions between them is essential, and therefore of crucial importance to all living organisms. We show that the physical interplay between two structural elements that are commonly present in bacterial mechanosensitive channels, namely a charged vestibule and a hydrophobic constriction, creates two distinct conformational states, open and closed, as well as the gating between them. We solve the nonequilibrium Stokes-Poisson-Nernst-Planck equations, extended to include a molecular potential of mean force, and show that a first order transition between the closed and open states arises naturally from the diffusio-osmotic stress caused by the ions and water inside the channel and the elastic restoring force from the membrane. Our proposed gating mechanism is likely to be important for a broad range of ion channels, as well as for biomimetic channels and ion channel-targeting therapeutics.

  16. Communication channel of fermionic system in accelerated frame

    E-Print Network [OSTI]

    Jinho Chang; Younghun Kwon

    2012-08-23

    In this article, we investigate the communication channel of fermionic system in an accelerated frame. We observe that at the infinite acceleration, the mutual information of single rail quantum channel coincides with that of double rail quantum channel, but those of classical ones reach different values. Furthermore, we find that at the infinite acceleration, the conditional entropy of single(or double) rail quantum channel vanishes, but those of classical ones may have finite values. In addition, we see that even when considering a method beyond the single mode approximation, the dual rail entangled state seems to provide better channel capacity than the single rail entangled state, unlike the bosonic case. Moreover, we find that the single-mode approximation is not sufficient to analyze the communication channel of fermionic system in an accelerated frame.

  17. Simulation of the Summer Monsoon Rainfall over East Asia using the NCEP GFS Cumulus Parameterization at Different Horizontal Resolutions

    SciTech Connect (OSTI)

    Lim, Kyo-Sun; Hong, Song You; Yoon, Jin-Ho; Han, Jongil

    2014-10-01

    The most recent version of Simplified Arakawa-Schubert (SAS) cumulus scheme in National Center for Environmental Prediction (NCEP) Global Forecast System (GFS) (GFS SAS) has been implemented into the Weather and Research Forecasting (WRF) model with a modification of triggering condition and convective mass flux to become depending on model’s horizontal grid spacing. East Asian Summer Monsoon of 2006 from June to August is selected to evaluate the performance of the modified GFS SAS scheme. Simulated monsoon rainfall with the modified GFS SAS scheme shows better agreement with observation compared to the original GFS SAS scheme. The original GFS SAS scheme simulates the similar ratio of subgrid-scale precipitation, which is calculated from a cumulus scheme, against total precipitation regardless of model’s horizontal grid spacing. This is counter-intuitive because the portion of resolved clouds in a grid box should be increased as the model grid spacing decreases. This counter-intuitive behavior of the original GFS SAS scheme is alleviated by the modified GFS SAS scheme. Further, three different cumulus schemes (Grell and Freitas, Kain and Fritsch, and Betts-Miller-Janjic) are chosen to investigate the role of a horizontal resolution on simulated monsoon rainfall. The performance of high-resolution modeling is not always enhanced as the spatial resolution becomes higher. Even though improvement of probability density function of rain rate and long wave fluxes by the higher-resolution simulation is robust regardless of a choice of cumulus parameterization scheme, the overall skill score of surface rainfall is not monotonically increasing with spatial resolution.

  18. Massively parallel processor networks with optical express channels

    DOE Patents [OSTI]

    Deri, R.J.; Brooks, E.D. III; Haigh, R.E.; DeGroot, A.J.

    1999-08-24

    An optical method for separating and routing local and express channel data comprises interconnecting the nodes in a network with fiber optic cables. A single fiber optic cable carries both express channel traffic and local channel traffic, e.g., in a massively parallel processor (MPP) network. Express channel traffic is placed on, or filtered from, the fiber optic cable at a light frequency or a color different from that of the local channel traffic. The express channel traffic is thus placed on a light carrier that skips over the local intermediate nodes one-by-one by reflecting off of selective mirrors placed at each local node. The local-channel-traffic light carriers pass through the selective mirrors and are not reflected. A single fiber optic cable can thus be threaded throughout a three-dimensional matrix of nodes with the x,y,z directions of propagation encoded by the color of the respective light carriers for both local and express channel traffic. Thus frequency division multiple access is used to hierarchically separate the local and express channels to eliminate the bucket brigade latencies that would otherwise result if the express traffic had to hop between every local node to reach its ultimate destination. 3 figs.

  19. Coupled-channel scattering in 1 + 1 dimensional lattice model

    SciTech Connect (OSTI)

    Guo, Peng [JLAB

    2013-07-01

    Based on the Lippmann-Schwinger equation approach, a generalized Lüscher’s formula in 1+1 dimensions for two particles scattering in both the elastic and coupled-channel cases in moving frames is derived. A two-dimensional coupled-channel scattering lattice model is presented, which represents a two-coupled-channel resonant scattering scalars system. The Monte Carlo simulation is performed on finite lattices and in various moving frames. The two-dimensional generalized Lüscher’s formula is used to extract the scattering amplitudes for the coupled-channel system from the discrete finite-volume spectrum.

  20. Plasma Channel Diagnostic Based on Laser Centroid Oscillations

    SciTech Connect (OSTI)

    Gonsalves, A.J.; Nakamura, K.; Lin, C.; Osterhoff, J.; Shiraishi, S.; Schroeder, C.B.; Geddes, C.G.R.; Toth, Cs.; Esarey, E.; Leemans, W.P.

    2010-02-12

    A technique has been developed for measuring the properties of discharge-based plasma channels by monitoring the centroid location of a laser beam exiting the channel as a function of input alignment offset between the laser and the channel. Experiments were performed using low-intensity (< 1014 Wcm-2) laser pulses focused onto the entrance of a hydrogen-filled capillary discharge waveguide. Scanning the laser centroid position at the input of the channel and recording the exit position allows determination of the channel depth with an accuracy of a few percent, measurement of the transverse channel shape, and inference of the matched spot size. In addition, accurate alignment of the laser beam through the plasma channel is provided by minimizing laser centroid motion at the channel exit as the channel depth is scanned either by scanning the plasma density or the discharge timing. The improvement in alignment accuracy provided by this technique will be crucial for minimizing electron beam pointing errors in laser plasma accelerators.

  1. A Channel Estimation Technique in OFDM Systems Using No Pilots

    E-Print Network [OSTI]

    Louisville, University of

    Abdelrehim ECE Department University of Louisville Louisville, KY, United States Said Elnoubi Electrical Engineering Department Alexandria University Alexandria, Egypt Abstract--This paper proposes a channel

  2. Massively parallel processor networks with optical express channels

    DOE Patents [OSTI]

    Deri, Robert J. (Pleasanton, CA); Brooks, III, Eugene D. (Livermore, CA); Haigh, Ronald E. (Tracy, CA); DeGroot, Anthony J. (Castro Valley, CA)

    1999-01-01

    An optical method for separating and routing local and express channel data comprises interconnecting the nodes in a network with fiber optic cables. A single fiber optic cable carries both express channel traffic and local channel traffic, e.g., in a massively parallel processor (MPP) network. Express channel traffic is placed on, or filtered from, the fiber optic cable at a light frequency or a color different from that of the local channel traffic. The express channel traffic is thus placed on a light carrier that skips over the local intermediate nodes one-by-one by reflecting off of selective mirrors placed at each local node. The local-channel-traffic light carriers pass through the selective mirrors and are not reflected. A single fiber optic cable can thus be threaded throughout a three-dimensional matrix of nodes with the x,y,z directions of propagation encoded by the color of the respective light carriers for both local and express channel traffic. Thus frequency division multiple access is used to hierarchically separate the local and express channels to eliminate the bucket brigade latencies that would otherwise result if the express traffic had to hop between every local node to reach its ultimate destination.

  3. Code design for erasure channels with limited or noisy feedback 

    E-Print Network [OSTI]

    Nagasubramanian, Karthik

    2009-05-15

    The availability of feedback in communication channels can significantly increase the reliability of transmission while decreasing the encoding and decoding complexity. Most of the applications like cellular telephony, ...

  4. Joint source channel coding for non-ergodic channels: the distortion signal-to-noise ratio (SNR) exponent perspective 

    E-Print Network [OSTI]

    Bhattad, Kapil

    2008-10-10

    the probability of outage is low. 28 However, the corresponding quantization error is large. When the multiplexing rate is increased quantization error decreases but outage probability increases. For these schemes, the optimal multiplexing rate is chosen... and channel coding is optimal. In this work we study this problem for non-ergodic channels. Although not much can be said about the general problem of transmitting any analog sources over any non-ergodic channels with any distortion metric, for many practical...

  5. Multi-channel medical imaging system

    DOE Patents [OSTI]

    Frangioni, John V

    2013-12-31

    A medical imaging system provides simultaneous rendering of visible light and fluorescent images. The system may employ dyes in a small-molecule form that remain in the subject's blood stream for several minutes, allowing real-time imaging of the subject's circulatory system superimposed upon a conventional, visible light image of the subject. The system may provide an excitation light source to excite the fluorescent substance and a visible light source for general illumination within the same optical guide used to capture images. The system may be configured for use in open surgical procedures by providing an operating area that is closed to ambient light. The systems described herein provide two or more diagnostic imaging channels for capture of multiple, concurrent diagnostic images and may be used where a visible light image may be usefully supplemented by two or more images that are independently marked for functional interest.

  6. Multiple channel optical data acquisition system

    DOE Patents [OSTI]

    Fasching, G.E.; Goff, D.R.

    1985-02-22

    A multiple channel optical data acquisition system is provided in which a plurality of remote sensors monitoring specific process variable are interrogated by means of a single optical fiber connecting the remote station/sensors to a base station. The remote station/sensors derive all power from light transmitted through the fiber from the base station. Each station/sensor is individually accessed by means of a light modulated address code sent over the fiber. The remote station/sensors use a single light emitting diode to both send and receive light signals to communicate with the base station and provide power for the remote station. The system described can power at least 100 remote station/sensors over an optical fiber one mile in length.

  7. Power module assemblies with staggered coolant channels

    SciTech Connect (OSTI)

    Herron, Nicholas Hayden; Mann, Brooks S; Korich, Mark D

    2013-07-16

    A manifold is provided for supporting a power module assembly with a plurality of power modules. The manifold includes a first manifold section. The first face of the first manifold section is configured to receive the first power module, and the second face of the first manifold section defines a first cavity with a first baseplate thermally coupled to the first power module. The first face of the second manifold section is configured to receive the second power module, and the second face of the second manifold section defines a second cavity with a second baseplate thermally coupled to the second power module. The second face of the first manifold section and the second face of the second manifold section are coupled together such that the first cavity and the second cavity form a coolant channel. The first cavity is at least partially staggered with respect to second cavity.

  8. Mathematical Modeling on Open Limestone Channel

    E-Print Network [OSTI]

    Bandstra, Joel; Wu, Naiyi

    2014-01-01

    Acid mine drainage (AMD) is the outflow of acidic water from metal mines or coal mines. When exposed to air and water, metal sulfides from the deposits of the mines are oxidized and produce acid, metal ions and sulfate, which lower the pH value of the water. An open limestone channel (OLC) is a passive and low cost way to neutralize AMD. The dissolution of calcium into the water increases the pH value of the solution. A differential equation model is numerically solved to predict the variation of concentration of each species in the OLC solution. The diffusion of Calcium due to iron precipitates is modeled by a linear equation. The results give the variation of pH value and the concentration of Calcium.

  9. Entropy of quantum channel in the theory of quantum information

    E-Print Network [OSTI]

    Wojciech Roga

    2011-10-03

    Quantum channels, also called quantum operations, are linear, trace preserving and completely positive transformations in the space of quantum states. Such operations describe discrete time evolution of an open quantum system interacting with an environment. The thesis contains an analysis of properties of quantum channels and different entropies used to quantify the decoherence introduced into the system by a given operation. Part I of the thesis provides a general introduction to the subject. In Part II, the action of a quantum channel is treated as a process of preparation of a quantum ensemble. The Holevo information associated with this ensemble is shown to be bounded by the entropy exchanged during the preparation process between the initial state and the environment. A relation between the Holevo information and the entropy of an auxiliary matrix consisting of square root fidelities between the elements of the ensemble is proved in some special cases. Weaker bounds on the Holevo information are also established. The entropy of a channel, also called the map entropy, is defined as the entropy of the state corresponding to the channel by the Jamiolkowski isomorphism. In Part III of the thesis, the additivity of the entropy of a channel is proved. The minimal output entropy, which is difficult to compute, is estimated by an entropy of a channel which is much easier to obtain. A class of quantum channels is specified, for which additivity of channel capacity is conjectured. The last part of the thesis contains characterization of Davies channels, which correspond to an interaction of a state with a thermal reservoir in the week coupling limit, under the condition of quantum detailed balance and independence of rotational and dissipative evolutions. The Davies channels are characterized for one-qubit and one-qutrit systems.

  10. A Catalog of Candidate Field Horizontal-Branch and A-Type Stars. III. A 2MASS-Cleaned Version

    E-Print Network [OSTI]

    Timothy C. Beers; Tiago Almeida; Silvia Rossi; Ronald Wilhelm; Brian Marsteller

    2006-10-10

    We present coordinates and available photometric information (either from previous or recent broadband UBV observations, and near-infrared photometry from the 2MASS Point Source Catalog) for 12056 stars (11516 of which are unique) identified in the HK Survey of Beers and colleagues as candidate field horizontal-branch or A-type stars. These stars, in the apparent magnitude range 10 <= B <= 16.0, were selected using an objective-prism/interference-filter survey technique. The availability of 2MASS information permits assembly of a cleaned version of this catalog, comprising likely blue horizontal-branch (BHB) stars or blue stragglers in the color interval -0.2 <= (B-V)o <= +0.2, which are of particular interest for investigation of the structure, kinematics, and dynamics of the thick disk and inner halo of the Milky Way, the total mass and mass profile of the Galaxy, and as potential foreground/background objects in efforts to bracket distances to high velocity clouds of H I. A comparison of the stars classified as high-likelihood BHB candidates with previous classifications based on UBV photometry and medium-resolution spectroscopy indicates that this class contains 78% correct identifications.

  11. Generation of concentration density maxima of small dispersive coal dust particles in horizontal iodine air filter at air-dust aerosol blow

    E-Print Network [OSTI]

    I. M. Neklyudov; O. P. Ledenyov; L. I. Fedorova; P. Ya. Poltinin

    2013-06-11

    The spatial distributions of the small dispersive coal dust particles with the nano and micro sizes in the granular filtering medium with the cylindrical coal granules in the absorber in the horizontal iodine air filter during its long term operation at the nuclear power plant are researched. It is shown that the concentration density maxima of the small dispersive coal dust particles appear in the granular filtering medium with the cylindrical coal absorbent granules in the horizontal iodine air filter at an action by the air dust aerosol blow. The comparison of the measured aerodynamic resistances of the horizontal and vertical iodine air filters is conducted. The main conclusion is that the magnitude of the aerodynamic resistance of the horizontal iodine air filters is much smaller in comparison with the magnitude of the aerodynamic resistance of the vertical iodine air filters at the same loads of the air dust aerosol volumes. It is explained that the direction of the air dust aerosol blow and the direction of the gravitation force in the horizontal iodine air filter are orthogonal, hence the effective accumulation of the small dispersive coal dust particles takes place at the bottom of absorber in the horizontal iodine air filter. It is found that the air dust aerosol stream flow in the horizontal iodine air filter is not limited by the appearing structures, made of the precipitated small dispersive coal dust particles, in distinction from the vertical iodine air filter, in the process of long term operation of the iodine air filters at the nuclear power plant.

  12. PHYSICAL REVIEW E 86, 041304 (2012) Shape and dynamics of seepage erosion in a horizontal granular bed

    E-Print Network [OSTI]

    Kudrolli, Arshad

    2012-01-01

    is observed to grow upstream when groundwater is injected at a boundary adjacent to a reservoir held distribution of avalanches increase with bed height when partial saturation of the bed leads to cohesion reservoir as opposed to being fed by local precipitation can be crucial to the shape of the channels. While

  13. Iterative Water-filling for Gaussian Vector Multiple Access Channels

    E-Print Network [OSTI]

    Li, Tiffany Jing

    Iterative Water-filling for Gaussian Vector Multiple Access Channels W. Yu, W. Rhee, S. Boyd, and J. Cioffi Zhenlei Shen Lehigh University March 29, 2005 Zhenlei Shen (Lehigh) Iterative Water-filling for Gaussian Vector Multiple Access ChannelsMarch 29, 2005 1 / 13 #12;1 Quick Review 2 Iterative Water

  14. Control power in perfect controlled teleportation via partially entangled channels

    E-Print Network [OSTI]

    Xi-Han Li; Shohini Ghose

    2014-10-05

    We analyze and evaluate perfect controlled teleportation via three-qubit entangled channels from the point of view of the controller. The key idea in controlled teleportation is that the teleportation is performed only with the participation of the controller. We calculate a quantitative measure of the controller's power and establish a lower bound on the control power required for controlled teleportation. We show that the maximally entangled GHZ state is a suitable channel for controlled teleportation of arbitrary single qubits - the controller's power meets the bound and the teleportation fidelity without the controller's permission is no better than the fidelity of a classical channel. We also construct partially entangled channels that exceed the bound for controlled teleportation of a restricted set of states called the equatorial states. We calculate the minimum entanglement required in these channels to exceed the bound. Moreover, we find that in these restricted controlled teleportation schemes, the partially entangled channels can outperform maximally entangled channels with respect to the controller's power. Our results provide a new perspective on controlled teleportation schemes and are of practical interest since we propose useful partially entangled channels.

  15. The Energy Harvesting Multiple Access Channel with Energy Storage Losses

    E-Print Network [OSTI]

    Yener, Aylin

    The Energy Harvesting Multiple Access Channel with Energy Storage Losses Kaya Tutuncuoglu and Aylin considers a Gaussian multiple access channel with two energy harvesting transmitters with lossy energy storage. The power allocation policy maximizing the average weighted sum rate given the energy harvesting

  16. Electromagnetic Side Channels of an FPGA Implementation of AES

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    Electromagnetic Side Channels of an FPGA Implementation of AES Vincent Carlier, Hervâ??e Chabanne processed. Another side channel is the one that exploits the Electromagnetic (EM) emanations. Indeed references. In [QS01, GMO01], Simple Electromagnetic Analysis (SEMA) and Di#erential Electromagnetic Analysis

  17. Electromagnetic Side Channels of an FPGA Implementation of AES

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    Electromagnetic Side Channels of an FPGA Implementation of AES Vincent Carlier, Herv´e Chabanne processed. Another side channel is the one that exploits the Electromagnetic (EM) emanations. Indeed references. In [QS01, GMO01], Simple Electromagnetic Analysis (SEMA) and Differential Electromagnetic

  18. Water Transport in Hydrophilic Channels of Nafion (DMR 0819860)

    E-Print Network [OSTI]

    Petta, Jason

    (RH) that open up the ion channels for optimal proton transport. Nafion, a polymer used for fuel cells Benziger, Princeton University Sr Fuel cells convert chemical energy to electrical energy by transporting protons through ion conducting channels in polymer membranes. Improving proton conduction will make fuel

  19. SERVICE OUTAGE BASED ADAPTIVE TRANSMISSION IN FADING CHANNELS

    E-Print Network [OSTI]

    Yates, Roy

    SERVICE OUTAGE BASED ADAPTIVE TRANSMISSION IN FADING CHANNELS BY JIANGHONG LUO A dissertation OF THE DISSERTATION Service Outage Based Adaptive Transmission in Fading Channels by Jianghong Luo Dissertation Director: Prof. Roy Yates, Prof. Predrag Spasojevi´c The service outage based allocation problem explores

  20. On Asymptotic Outage Capacity Distribution of Correlated MIMO Channels

    E-Print Network [OSTI]

    Loyka, Sergey

    On Asymptotic Outage Capacity Distribution of Correlated MIMO Channels Georgy Levin* and Sergey condition for the asymptotic normality of MIMO channel outage capacity is considered. Some physical aspects, asymptotic capacity, correlation. I. INTRODUCTION Outage capacity is one of the major characteristics

  1. Wood in rivers: interactions with channel morphology and processes

    E-Print Network [OSTI]

    Montgomery, David R.

    Editorial Wood in rivers: interactions with channel morphology and processes No doubt about it, wood complicates fluvial geo- morphology. It messes up nice tidy streams, compli- cates quantitative through the study of channels lacking a substantial load of wood debris (Leopold et al., 1964

  2. Ion-Channeling in Direct Dark Matter Crystalline Detectors

    E-Print Network [OSTI]

    Graciela B. Gelmini

    2010-12-17

    The channeling of the recoiling nucleus in crystalline detectors after a WIMP collision would produce a larger scintillation or ionization signal in direct detection experiments than otherwise expected. I present estimates of the importance of this effect in NaI, Si and Ge crystals, using analytic models developed from the 1960's onwards to describe channeling and blocking effects.

  3. Radiation Emission by Electrons Channeling in Bent Silicon Crystals

    E-Print Network [OSTI]

    Polozkov, R G; Sushko, G B; Korol, Andrey V; Solov'yov, Andrey V

    2014-01-01

    Results of numerical simulations of electron channeling and emission spectra are reported for straight and uniformly bent silicon crystal. The projectile trajectories are computed using the newly developed module [1] of the MBN Explorer package [2,3]. The electron channeling along Si(110) crystallographic planes is studied for the projectile energy 855 MeV.

  4. Wind Noise Reduction in Single Channel Speech Signals

    E-Print Network [OSTI]

    Wind Noise Reduction in Single Channel Speech Signals Kristian Timm Andersen Kongens Lyngby 2008;Abstract In this thesis a number of wind noise reduction techniques have been reviewed, implemented and evaluated. The focus is on reducing wind noise from speech in single channel signals. More specically

  5. All entangled states are useful for channel discrimination

    E-Print Network [OSTI]

    M. Piani; J. Watrous

    2009-07-16

    We prove that every entangled state is useful as a resource for the problem of minimum-error channel discrimination. More specifically, given a single copy of an arbitrary bipartite entangled state, it holds that there is an instance of a quantum channel discrimination task for which this state allows for a correct discrimination with strictly higher probability than every separable state.

  6. Clustering of cyclic-nucleotide-gated channels in olfactory cilia

    E-Print Network [OSTI]

    French, Donald A.

    Cincinnati, OH 45267-0667, USA 513-558-6099 513-558-2727 FAX steve@syrano.acb.uc.edu Running title: CNG of olfactory signal transduction, including a high density of cyclic-nucleotide-gated (CNG) channels. CNG the locations of CNG channels along the length may be important in determining the sensitivity of odor detection

  7. Streams and Drainage Systems Stream Channel: natural passageway

    E-Print Network [OSTI]

    Gung, Yuancheng

    ;Base Level The stream's potential energy decreases as it flows downslope, and falls to zeroStreams and Drainage Systems #12; - / - - #12; - - - - #12; (Stream) #12;Stream Channel: natural passageway A stream's discharge may vary along the channel and through the time because

  8. Sparse Channel Estimation for Multicarrier Underwater Acoustic Communication: From

    E-Print Network [OSTI]

    Zhou, Shengli

    channel energy is concentrated on a few delay and/or Doppler values [5], [6]. Sparse channel estimation], or Monte Carlo Markov Chain methods [10]. More recently, advances in the new field of compressive sensing data was recorded as part of the SPACE'08 experiment off the coast of Martha's Vineyard, MA, from Oct

  9. Distributed Channel Probing for Efficient Transmission Scheduling in Wireless Networks

    E-Print Network [OSTI]

    Srikant, Rayadurgam

    to continuously estimate the channel quality before each transmission decision in opportunistic scheduling over statistics and rates, and note its tightness in the symmetric and independent ON- OFF fading scenario. We transmission decision. However, in the presence of many contending users that utilize the time-varying channel

  10. Secular Sediment Waves, Channel Bed Waves, and Legacy Sediment

    E-Print Network [OSTI]

    James, L. Allan

    Secular Sediment Waves, Channel Bed Waves, and Legacy Sediment L. Allan James* Geography Department, University South Carolina Abstract The concept of sediment waves is reviewed and clarifications are proposed for nomenclature con- cerning vertical channel responses to large fluvial sediment fluxes over a period of a decade

  11. Adaptive Modulation for Fading Channels Nilo Casimiro Ericsson

    E-Print Network [OSTI]

    communication systems, transmission in the downlink will often dominate the traf­ fic load. High bit. INTRODUCTION Fading channels confront us with the problem of lost packets and the need for frequent the signalling overhead. For a predicted value of the signal to noise ratio (SNR) of the channel, the modulation

  12. Adaptive Modulation for Fading Channels Nilo Casimiro Ericsson

    E-Print Network [OSTI]

    communication systems, transmission in the downlink will often dominate the traf- fic load. High bit. INTRODUCTION Fading channels confront us with the problem of lost packets and the need for frequent the signalling overhead. For a predicted value of the signal to noise ratio (SNR) of the channel, the modulation

  13. Optimal Training Signals for MIMO OFDM Channel Estimation

    E-Print Network [OSTI]

    Minn, Hlaing

    Optimal Training Signals for MIMO OFDM Channel Estimation Hlaing Minn*, Member, IEEE and Naofal Al.minn@utdallas.edu, aldhahir@utdallas.edu Abstract--This paper presents general classes of optimal train- ing signals transform are used to derive the optimal training signals which minimize the channel estimation mean square

  14. channels enable burst output in rat cerebellar Purkinje cells

    E-Print Network [OSTI]

    Turner, Ray

    to generate an appropriate spike output depends on a balance between membrane depolarizationsKv3 K+ channels enable burst output in rat cerebellar Purkinje cells B. E. McKay and R. W. Turner and the repolarizing actions of K+ currents. The high-voltage-activated Kv3 class of K+ channels repolarizes Na+ spikes

  15. In-vehicle mm-Wave Channel Model and Measurement

    E-Print Network [OSTI]

    Zemen, Thomas

    . I. INTRODUCTION The ever increasing vehicle efficiency goes hand in hand with weight savings. OneIn-vehicle mm-Wave Channel Model and Measurement Jiri Blumenstein, Tomas Mikulasek, Roman Marsalek measurements carried out in the intra­ vehicle environment. Channels in the millimeter-wave (MMW) frequency

  16. Channel bed evolution and sediment transport under declining sand inputs

    E-Print Network [OSTI]

    Montgomery, David R.

    Channel bed evolution and sediment transport under declining sand inputs Karen B. Gran,1,2 David R structure development and sediment transport as sand inputs decline. On the Pasig-Potrero River, we investigated channel recovery following emplacement of sand-rich pyroclastic deposits in the 1991 eruption

  17. Performance Analysis of Multi-Channel Wireless Infrastructure Networks

    E-Print Network [OSTI]

    Ramasubramanian, Srinivasan

    between channels with some tuning delay. A node is a stationary wireless router which is mounted usuallyPerformance Analysis of Multi-Channel Wireless Infrastructure Networks Sangman Cho, Srinivasan, Washington, DC 20052 Abstract--Wireless infrastructure networks that provide ubiq- uitous connectivity

  18. Analysis of Seepage from Polygon Channels Bhagu R. Chahar1

    E-Print Network [OSTI]

    Chahar, B. R.

    Analysis of Seepage from Polygon Channels Bhagu R. Chahar1 Abstract: An exact analytical solution conformal mapping and Green- Neumann functions. Chahar 2001 analyzed seepage from slit and strip channels by a drainage layer. Chahar 2000 and Swamee et al. 2001 obtained an analytical solution for seepage from

  19. Analyzing video compression for transporting over wireless fading channels 

    E-Print Network [OSTI]

    Kannan, Karthik

    2006-10-30

    to analyze the effect of a wireless channel on a video transmission. The aim of this research is to analyze the video transmission over Rayleigh fading channels for various bit error rates (BER), signal to noise ratios (Eb/N0) and Doppler rates...

  20. Columbia River Channel Improvement Project Rock Removal Blasting: Monitoring Plan

    SciTech Connect (OSTI)

    Carlson, Thomas J.; Johnson, Gary E.

    2010-01-29

    This document provides a monitoring plan to evaluate take as outlined in the National Marine Fisheries Service 2002 Biological Opinion for underwater blasting to remove rock from the navigation channel for the Columbia River Channel Improvement Project. The plan was prepared by the Pacific Northwest National Laboratory (PNNL) for the U.S. Army Corps of Engineers (USACE), Portland District.

  1. On Sufficient Conditions for Testing Optimality of Codewords in ISI Channels

    E-Print Network [OSTI]

    Kavcic, Aleksandar

    On Sufficient Conditions for Testing Optimality of Codewords in ISI Channels Fabian Lim1 if a codeword is optimal, for intersymbol interference (ISI) channels. I. INTRODUCTION The maximum interference (ISI) channels, where (channel) memory is present. The techniques for the memoryless channels

  2. Queuing Network Models for Multi-Channel P2P Live Streaming Systems

    E-Print Network [OSTI]

    Liu, Yong

    , including peer channel switching, peer churn, peer bandwidth heterogeneity, and Zipf-like channel popularity if not millions of live channels. In P2P live video streaming systems, churn occurs on two different time scales-channel or more simply as ISO P2P streaming systems. Unfortunately, this channel churn brings enormous instability

  3. Designer proton-channel transgenic algae for photobiological hydrogen production

    DOE Patents [OSTI]

    Lee, James Weifu (Knoxville, TN)

    2011-04-26

    A designer proton-channel transgenic alga for photobiological hydrogen production that is specifically designed for production of molecular hydrogen (H.sub.2) through photosynthetic water splitting. The designer transgenic alga includes proton-conductive channels that are expressed to produce such uncoupler proteins in an amount sufficient to increase the algal H.sub.2 productivity. In one embodiment the designer proton-channel transgene is a nucleic acid construct (300) including a PCR forward primer (302), an externally inducible promoter (304), a transit targeting sequence (306), a designer proton-channel encoding sequence (308), a transcription and translation terminator (310), and a PCR reverse primer (312). In various embodiments, the designer proton-channel transgenic algae are used with a gas-separation system (500) and a gas-products-separation and utilization system (600) for photobiological H.sub.2 production.

  4. Planar channeling and quasichanneling oscillations in a bent crystal

    E-Print Network [OSTI]

    Sytov, A I; Bandiera, L; Germogli, G; Guidi, V; Mazzolari, A; Tikhomirov, V V

    2015-01-01

    Particles passing through a crystal under planar channeling experience transverse oscillations in their motion. As channeled particles approach the atomic planes of a crystal, they are likely to be dechanneled. This effect was used in ion-beam analysis with MeV energy. We studied this effect in a bent crystal for positive and negative particles within a wide range of energies in sight of application of such crystals at accelerators. We found the conditions for the appearance or not of channeling oscillations. Indeed a new kind of oscillations, strictly related to the motion of over-barrier particles, i.e. quasichanneling particles, has been predicted. Such oscillations, named planar quasichanneling oscillations, possess a different nature than channeling oscillations. Through computer simulation, we studied this effect and provided a theoretical interpretation for them. We show that channeling oscillations can be observed only for positive particles while quasichanneling oscillations can exist for particles w...

  5. Component having cooling channel with hourglass cross section

    DOE Patents [OSTI]

    Campbell, Christian X; Lee, Ching-Pang

    2015-04-28

    A cooling channel (36, 36B, 63-66) cools inner surfaces (48, 50) of exterior walls (41, 43) of a component (20, 60). Interior side surfaces (52, 54) of the channel converge to a waist (W2), forming an hourglass shaped transverse profile (46). The inner surfaces (48, 50) may have fins (44) aligned with the coolant flow (22). The fins may have a transverse profile (56A, 56B) highest at mid-width of the inner surfaces (48, 50). Turbulators (92) may be provided on the side surfaces (52, 54) of the channel, and may urge the coolant flow toward the inner surfaces (48, 50). Each turbulator (92) may have a peak (97) that defines the waist of the cooling channel. Each turbulator may have a convex upstream side (93). These elements increase coolant flow in the corners (C) of the channel to more uniformly and efficiently cool the exterior walls (41, 43).

  6. Premixed Flame Dynamics in Narrow 2D Channels

    E-Print Network [OSTI]

    Ayoobi, Mohsen

    2015-01-01

    Premixed flames propagating within small channels show complex combustion phenomena that differ from flame propagation at conventional scales. Available experimental and numerical studies have documented stationary/non-stationary and/or asymmetric modes that depend on properties of the incoming reactant flow as well as channel geometry and wall temperatures. The present work seeks to illuminate mechanisms leading to symmetry-breaking and limit cycle behavior that are fundamental to these combustion modes. Specifically, four cases of lean premixed methane/air combustion -- two equivalence ratios (0.53 and 0.7) and two channel widths (2 and 5mm) -- are investigated in a 2D configuration with constant channel length and bulk inlet velocity, where numerical simulations are performed using detailed chemistry. External wall heating is simulated by imposing a linear temperature gradient as a boundary condition on both walls. In the 2mm-channel, both equivalence ratios produce flames that stabilize with symmetric fla...

  7. Powerline Communications Channel Modelling Methodology Based on Statistical Features

    E-Print Network [OSTI]

    Tan, Bo

    2012-01-01

    This paper proposes a new channel modelling method for powerline communications networks based on the multipath profile in the time domain. The new channel model is developed to be applied in a range of Powerline Communications (PLC) research topics such as impulse noise modelling, deployment and coverage studies, and communications theory analysis. To develop the methodology, channels are categorised according to their propagation distance and power delay profile. The statistical multipath parameters such as path arrival time, magnitude and interval for each category are analyzed to build the model. Each generated channel based on the proposed statistical model represents a different realisation of a PLC network. Simulation results in similar the time and frequency domains show that the proposed statistical modelling method, which integrates the impact of network topology presents the PLC channel features as the underlying transmission line theory model. Furthermore, two potential application scenarios are d...

  8. Characterization of coherent power of concatenation of quantum channels

    E-Print Network [OSTI]

    Kaifeng Bu; Lin Zhang; Junde Wu

    2015-10-27

    Quantum coherence, existing in quantum states, is a very important resource for design and implementation of quantum technologies. Quantum channels that can generate coherence is also an interesting topic and less known results about it. In this paper, we focus mainly on the coherent power of quantum channels and give a operational meaning to the coherent power. Then we characterize the coherent power of concatenation of quantum channels via that of individual channels. In addition, we also propose a new proper coherence measures which is subadditive. Thus coherence measure can be superadditive, additive, or subadditive, up to the specific problems investigated. At the end of this paper, we compare two different definitions of the coherent powers of quantum channels and find that they are not equivalent in general.

  9. IEEE TRANSACTIONS ON SIGNAL PROCESSING, VOL. 60, NO. 8, AUGUST 2012 4403 Joint Source-Channel Coding and Channelization

    E-Print Network [OSTI]

    Zhang, Tong

    -Channel Coding and Channelization for Embedded Video Processing With Flash Memory Storage Yiran Li, Guiqiang Dong and hence higher data storage/retrieval energy consumption. This clearly demands a system optimizationIEEE TRANSACTIONS ON SIGNAL PROCESSING, VOL. 60, NO. 8, AUGUST 2012 4403 Joint Source

  10. Quantum channel for the transmission of information

    DOE Patents [OSTI]

    Dress, William B.; Kisner, Roger A.; Richards, Roger K.

    2004-01-13

    Systems and methods are described for a quantum channel for the transmission of information. A method includes: down converting a beam of coherent energy to provide a beam of multi-color entangled photons; converging two spatially resolved portions of the beam of multi-color entangled photons into a converged multi-color entangled photon beam; changing a phase of at least a portion of the converged multi-color entangled photon beam to generate a first interferometric multi-color entangled photon beam; combining the first interferometric multi-color entangled photon beam with a second interferometric multi-color entangled photon beam within a single beam splitter; wherein combining includes erasing energy and momentum characteristics from both the first interferometric multi-color entangled photon beam and the second interferometric multi-color entangled photon beam; splitting the first interferometric multi-color entangled photon beam and the second interferometric multi-color entangled photon beam within the single beam splitter, wherein splitting yields a first output beam of multi-color entangled photons and a second output beam of multi-color entangled photons; and modulating the first output beam of multi-color entangled photons.

  11. Statistical Hot Channel Analysis for the NBSR

    SciTech Connect (OSTI)

    Cuadra A.; Baek J.

    2014-05-27

    A statistical analysis of thermal limits has been carried out for the research reactor (NBSR) at the National Institute of Standards and Technology (NIST). The objective of this analysis was to update the uncertainties of the hot channel factors with respect to previous analysis for both high-enriched uranium (HEU) and low-enriched uranium (LEU) fuels. Although uncertainties in key parameters which enter into the analysis are not yet known for the LEU core, the current analysis uses reasonable approximations instead of conservative estimates based on HEU values. Cumulative distribution functions (CDFs) were obtained for critical heat flux ratio (CHFR), and onset of flow instability ratio (OFIR). As was done previously, the Sudo-Kaminaga correlation was used for CHF and the Saha-Zuber correlation was used for OFI. Results were obtained for probability levels of 90%, 95%, and 99.9%. As an example of the analysis, the results for both the existing reactor with HEU fuel and the LEU core show that CHFR would have to be above 1.39 to assure with 95% probability that there is no CHF. For the OFIR, the results show that the ratio should be above 1.40 to assure with a 95% probability that OFI is not reached.

  12. Muon Beam Helical Cooling Channel Design

    SciTech Connect (OSTI)

    Johnson, Rolland; Ankenbrandt, Charles; Flanagan, G.; Kazakevich, G.M.; Marhauser, Frank; Neubauer, Michael; Roberts, T.; Yoshikawa, C.; Derbenev, Yaroslav; Morozov, Vasiliy; Kashikhin, V.S.; Lopes, Mattlock; Tollestrup, A.; Yonehara, Katsuya; Zloblin, A.

    2013-06-01

    The Helical Cooling Channel (HCC) achieves effective ionization cooling of the six-dimensional (6d) phase space of a muon beam by means of a series of 21st century inventions. In the HCC, hydrogen-pressurized RF cavities enable high RF gradients in strong external magnetic fields. The theory of the HCC, which requires a magnetic field with solenoid, helical dipole, and helical quadrupole components, demonstrates that dispersion in the gaseous hydrogen energy absorber provides effective emittance exchange to enable longitudinal ionization cooling. The 10-year development of a practical implementation of a muon-beam cooling device has involved a series of technical innovations and experiments that imply that an HCC of less than 300 m length can cool the 6d emittance of a muon beam by six orders of magnitude. We describe the design and construction plans for a prototype HCC module based on oxygen-doped hydrogen-pressurized RF cavities that are loaded with dielectric, fed by magnetrons, and operate in a superconducting helical solenoid magnet.

  13. The Bulk Channel in Thermal Gauge Theories

    E-Print Network [OSTI]

    Harvey B. Meyer

    2010-02-17

    We investigate the thermal correlator of the trace of the energy-momentum tensor in the SU(3) Yang-Mills theory. Our goal is to constrain the spectral function in that channel, whose low-frequency part determines the bulk viscosity. We focus on the thermal modification of the spectral function, $\\rho(\\omega,T)-\\rho(\\omega,0)$. Using the operator-product expansion we give the high-frequency behavior of this difference in terms of thermodynamic potentials. We take into account the presence of an exact delta function located at the origin, which had been missed in previous analyses. We then combine the bulk sum rule and a Monte-Carlo evaluation of the Euclidean correlator to determine the intervals of frequency where the spectral density is enhanced or depleted by thermal effects. We find evidence that the thermal spectral density is non-zero for frequencies below the scalar glueball mass $m$ and is significantly depleted for $m\\lesssim\\omega\\lesssim 3m$.

  14. Contribution to the Study of Ferrite Nanobeads: Synthesis, Characterization and Investigation of Horizontal Low Gradient Magnetophoresis Behaviour

    SciTech Connect (OSTI)

    Benelmekki, Maria; Caparros, Cristina; Goncalves, Renao; Lanceros-Mendez, Senenxu; Montras, Anna; Martinez, Lluis Miquel

    2010-12-02

    In this work we investigate the possibilities of the use of Horizontal Low Gradient Magnetic Field (HLGMF)(<100 T/m) for filtration, control and separation of the synthesized magnetic particles, considering, the characteristics of the suspension, the size and the type of nanoparticles (NPs) and focusing on the process scale up. Reversible aggregation is considered in the different steps of magnetic nanobeads synthesis. For these purpose, we synthesized Fe{sub 2}O{sub 3}-silica core-shell nanobeads by co-precipitation, monodispersion and silica coating. SQUID, TEM, XRD, and Zeta potential techniques were used to characterize the synthesized nanobeads. An extensive magnetophoresis study was performed at different magnetophoretic conditions. Different reversible aggregation times were observed at different HLGMF, at each step of the synthesis route: Several orders of magnitude differences where observed when comparing citric acid (CA) suspension with silicon coated beads. Reversible aggregation times are correlated with the properties of the NPs at different steps of synthesis.

  15. Shear-horizontal surface acoustic wave phononic device with high density filling material for ultra-low power sensing applications

    SciTech Connect (OSTI)

    Richardson, M.; Bhethanabotla, V. R.; Sankaranarayanan, S. K. R. S.

    2014-06-23

    Finite element simulations of a phononic shear-horizontal surface acoustic wave (SAW) sensor based on ST 90°-X Quartz reveal a dramatic reduction in power consumption. The phononic sensor is realized by artificially structuring the delay path to form an acoustic meta-material comprised of a periodic microcavity array incorporating high-density materials such as tantalum or tungsten. Constructive interference of the scattered and secondary reflected waves at every microcavity interface leads to acoustic energy confinement in the high-density regions translating into reduced power loss. Tantalum filled cavities show the best performance while tungsten inclusions create a phononic bandgap. Based on our simulation results, SAW devices with tantalum filled microcavities were fabricated and shown to significantly decrease insertion loss. Our findings offer encouraging prospects for designing low power, highly sensitive portable biosensors.

  16. The effect of horizontal resolution on simulation quality in the Community Atmospheric Model, CAM5.1

    SciTech Connect (OSTI)

    Wehner, Michael F.; Reed, Kevin A.; Li, Fuyu; Prabhat, -; Bacmeister, Julio; Chen, Cheng -Ta; Paciorek, Christopher; Gleckler, Peter J.; Sperber, Kenneth R.; Collins, William D.; Gettelman, Andrew; Jablonowski, Christiane

    2014-11-05

    We present an analysis of version 5.1 of the Community Atmospheric Model (CAM5.1) at a high horizontal resolution. Intercomparison of this global model at approximately 0.25°, 1°, and 2° is presented for extreme daily precipitation as well as for a suite of seasonal mean fields. In general, extreme precipitation amounts are larger in high resolution than in lower-resolution configurations. In many but not all locations and/or seasons, extreme daily precipitation rates in the high-resolution configuration are higher and more realistic. The high-resolution configuration produces tropical cyclones up to category 5 on the Saffir-Simpson scale and a comparison to observations reveals both realistic and unrealistic model behavior. In the absence of extensive model tuning at high resolution, simulation of many of the mean fields analyzed in this study is degraded compared to the tuned lower-resolution public released version of the model.

  17. Design of a horizontal test cryostat for superconducting RF cavities for the FREIA facility at Uppsala University

    SciTech Connect (OSTI)

    Chevalier, N. R.; Thermeau, J.-P.; Bujard, P.; Junquera, T. [Accelerators and Cryogenic Systems (ACS), 86 rue de Paris, 91400 Orsay (France); Hermansson, L.; Kern, R. Santiago; Ruber, R. [Uppsala University, Department of Physics and Astronomy, 75120 Uppsala (Sweden)

    2014-01-29

    Uppsala University is constructing a large scale facility, called FREIA (Facility for Research Instrumentation and Accelerator Development). FREIA includes a helium liquefier and an accelerator test facility and has the capacity to test superconducting radio-frequency (RF) cavities with the same RF system and RF power level as in an accelerator. A central element of FREIA is a horizontal test cryostat connected in closed loop to a helium liquefier. This cryostat can house two fully equipped (tuners, piezo, power coupler, helium tank) superconducting cavities to perform full RF high power tests and operate at temperatures between 1.8 K and 4.2 K. The cryostat is designed to accommodate a large array of superconducting cavities and magnets, among which the European Spallation Source (ESS) type spoke and high-? elliptical cavities as well as TESLA/ILC type elliptical cavities. The present status of the project and the design of the cryostat are reported.

  18. Direct-bandgap electroluminescence from a horizontal Ge p-i-n ridge waveguide on Si(001) substrate

    SciTech Connect (OSTI)

    Liu, Zhi; Li, Yaming; He, Chao; Li, Chuanbo; Xue, Chunlai; Zuo, Yuhua; Cheng, Buwen Wang, Qiming

    2014-05-12

    Horizontal injection Ge p-i-n ridge waveguide light emitting diodes (LEDs) were fabricated on n{sup ?}-Si(001) substrates by ultrahigh vacuum chemical vapor deposition. The direct-bandgap electroluminescence (EL) of Ge waveguide LEDs under a continuous/pulse electrical pump was studied. The heating effect from a continuous electrical pump was found to significantly enhance the emission of devices. The top surface EL intensity of the Ge waveguide LEDs significantly depended on the position. Most direct-bandgap radiative recombination of Ge p-i-n waveguide LEDs occurred near the N{sup +} region of the junction. This interesting phenomenon could be explained by the carrier distribution in the junction and the pseudo-direct bandgap of Ge.

  19. The effect of horizontal resolution on simulation quality in the Community Atmospheric Model, CAM5.1

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Wehner, Michael F.; Reed, Kevin A.; Li, Fuyu; Prabhat, -; Bacmeister, Julio; Chen, Cheng -Ta; Paciorek, Christopher; Gleckler, Peter J.; Sperber, Kenneth R.; Collins, William D.; et al

    2014-11-05

    We present an analysis of version 5.1 of the Community Atmospheric Model (CAM5.1) at a high horizontal resolution. Intercomparison of this global model at approximately 0.25°, 1°, and 2° is presented for extreme daily precipitation as well as for a suite of seasonal mean fields. In general, extreme precipitation amounts are larger in high resolution than in lower-resolution configurations. In many but not all locations and/or seasons, extreme daily precipitation rates in the high-resolution configuration are higher and more realistic. The high-resolution configuration produces tropical cyclones up to category 5 on the Saffir-Simpson scale and a comparison to observations revealsmore »both realistic and unrealistic model behavior. In the absence of extensive model tuning at high resolution, simulation of many of the mean fields analyzed in this study is degraded compared to the tuned lower-resolution public released version of the model.« less

  20. Feasibility study of air-breathing turbo-engines for horizontal take-off and landing space plane

    SciTech Connect (OSTI)

    Minoda, M.; Sakata, K.; Tamaki, T.; Saitoh, T.; Yasuda, A.

    1989-01-01

    Various concepts of air-breathing engines (ABEs) that could be used for a horizontal take-off and landing SSTO vehicle are investigated. The performances (with respect to thrust and the specific fuel consumption) of turboengines based on various technologies, including a turbojet with and without afterburner (TJ), turboramjet, and air-turbo-ram jet engines are compared. The mission capabilities of these ABEs for SSTO and TSTO vehicles is examined in terms of the ratio of the effective remaining weight (i.e., the weight on the orbit) to the take-off gross weight, using two-dimensional flight analysis. It was found that the dry TJ with the turbine inlet temperature 2000 C is one of the most promising candidates for the propulsion system of the SSTO vehicle, because of its small weight and high specific impulse. 6 refs.

  1. Classical capacity of Gaussian communication under a single noisy channel

    E-Print Network [OSTI]

    Jaehak Lee; Se-Wan Ji; Jiyong Park; Hyunchul Nha

    2015-05-06

    A long-standing problem on the classical capacity of bosonic Gaussian channels has recently been resolved by proving the minimum output entropy conjecture. It is also known that the ultimate capacity quantified by the Holevo bound can be achieved asymptotically by using an infinite number of channels. However, it is less understood to what extent the communication capacity can be reached if one uses a finite number of channels, which is a topic of practical importance. In this paper, we study the capacity of Gaussian communication, i.e., employing Gaussian states and Gaussian measurements to encode and decode information under a single-channel use. We prove that the optimal capacity of single-channel Gaussian communication is achieved by one of two well-known protocols, i.e., coherent-state communication or squeezed-state communication, depending on the energy (number of photons) as well as the characteristics of the channel. Our result suggests that the coherent-state scheme known to achieve the ultimate information-theoretic capacity is not a practically optimal scheme for the case of using a finite number of channels. We find that overall the squeezed-state communication is optimal in a small-photon-number regime whereas the coherent-state communication performs better in a large-photon-number regime.

  2. Progress on Superconducting Magnets for the MICE Cooling Channel

    SciTech Connect (OSTI)

    Green, Michael A; Virostek, Steve P.; Li, Derun; Zisman, Michael S.; Wang, Li; Pan, Heng; Wu, Hong; Guo, XingLong; Xu, FengYu; Liu, X. K.; Zheng, S. X.; Bradshaw, Thomas; Baynham, Elwyn; Cobb, John; Lau, Wing; Lau, Peter; Yang, Stephanie Q.

    2009-09-09

    The muon ionization cooling experiment (MICE) consists of a target, a beam line, a pion decay channel, the MICE cooling channel. Superconducting magnets are used in the pion decay channel and the MICE cooling channel. This report describes the MICE cooling channel magnets and the progress in the design and fabrication of these magnets. The MICE cooling channel consists of three types of superconducting solenoids; the spectrometer solenoids, the coupling solenoids and the focusing solenoids. The three types of magnets are being fabricated in he United States, China, and the United Kingdom respectively. The spectrometer magnets are used to analyze the muon beam before and after muon cooling. The coupling magnets couple the focusing sections and keep the muon beam contained within the iris of the RF cavities that re used to recover the muon momentum lost during ionization cooling. The focusing magnets focus the muon beam in the center of a liquid hydrogen absorber. The first of the cooling channel magnets will be operational in MICE in the spring of 2010.

  3. The Century Survey Galactic Halo Project II: Global Properties and the Luminosity Function of Field Blue Horizontal Branch Stars

    E-Print Network [OSTI]

    Warren R. Brown; Margaret J. Geller; Scott J. Kenyon; Michael J. Kurtz; Carlos Allende Prieto; Timothy C. Beers; Ronald Wilhelm

    2005-05-16

    We discuss a 175 deg^2 spectroscopic survey for blue horizontal branch (BHB) stars in the Galactic halo. We use the Two Micron All Sky Survey (2MASS) and the Sloan Digital Sky Survey (SDSS) to select BHB candidates, and find that the 2MASS and SDSS color-selection is 38% and 50% efficient, respectively, for BHB stars. Our samples include one likely run-away B7 star 6 kpc below the Galactic plane. The global properties of the BHB samples are consistent with membership in the halo population: the median metallicity is [Fe/H]=-1.7, the velocity dispersion is 108 km/s, and the mean Galactic rotation of the BHB stars 3<|z|<15 kpc is -4 +- 30 km/s. We discuss the theoretical basis of the Preston, Shectman & Beers M_V-color relation for BHB stars, and conclude that intrinsic shape of the BHB M_V-color relation results from the physics of stars on the horizontal branch. We calculate the luminosity function for the field BHB star samples using the Efstathiou, Ellis, & Peterson maximum-likelihood method which is unbiased by density variations. The field BHB luminosity function exhibits a steep rise at bright luminosities, a peak between 0.8 < M_V < 1.0, and a tail at faint luminosities. We compare the field BHB luminosity functions with the luminosity functions derived from sixteen different globular cluster BHBs. Kolmogorov-Smirnov tests suggest that field BHB stars and BHB stars in globular clusters share a common distribution of luminosities, with the exception of globular clusters with extended BHBs.

  4. Demodulation of a positron beam in a bent crystal channel

    E-Print Network [OSTI]

    Kostyuk, A; Solov'yov, A V; Greiner, W

    2011-01-01

    The evolution of a modulated positron beam in a planar crystal channel is investigated within the diffusion approach. A detailed description of the formalism is given. A new parameter, the demodulation length, is introduced, representing the quantitative measure of the depth at which the channelling beam preserves its modulation in the crystal. It is demonstrated that there exist crystal channels with the demodulation length sufficiently large for using the crystalline undulator as a coherent source of hard X rays. This finding is a crucial milestone in developing a new type of lasers radiating in the hard X ray and gamma ray range.

  5. Information-Theoretically Secure Communication Under Channel Uncertainty 

    E-Print Network [OSTI]

    Ly, Hung Dinh

    2012-07-16

    for the legitimate receiver and the eavesdropper channel respectively, and N1 and N2 are additive white Gaussian noise with zero means and unit variances. The secrecy capacity of the channel was characterized in [5] and can be written as Cs(P, a, b) = [ 1 2... log(1 + aP )? 1 2 log(1 + bP ) ]+ (1.6) where [x]+ := max(0, x). Note from (1.6) that Cs(P, a, b) > 0 if and only if a > b. That is, for the Gaussian wiretap channel (1.4), asymptotic perfect secrecy commu- nication is possible if and only...

  6. Gating-by-tilt of mechanosensitive membrane channels

    E-Print Network [OSTI]

    Matthew S. Turner; Pierre Sens

    2003-11-25

    We propose an alternative mechanism for the gating of biological membrane channels in response to membrane tension that involves a change in the slope of the membrane near the channel. Under biological membrane tensions we show that the energy difference between the closed (tilted) and open (untilted) states can far exceed kBT and is comparable to what is available under simple ilational gating. Recent experiments demonstrate that membrane leaflet asymmetries (spontaneous curvature) can strong effect the gating of some channels. Such a phenomenon would be more easy to explain under gating-by-tilt, given its novel intrinsic sensitivity to such asymmetry.

  7. Cold plate with combined inclined impingement and ribbed channels

    DOE Patents [OSTI]

    Parida, Pritish R.

    2015-12-22

    Heat transfer devices and methods for making the same that include a first enclosure having at least one inlet port; a second enclosure having a bottom plate and one or more dividing walls to establish channels, at least one internal surface of each channel having rib structures to create turbulence in a fluid flow; and a jet plate connecting the first enclosure and the second enclosure having impinging jets that convey fluid from the first enclosure to the channels, said impinging jets being set at an angular deviation from normal to cause local acceleration of fluid and to increase a local heat transfer rate.

  8. Controlled remote state preparation via partially entangled quantum channel

    E-Print Network [OSTI]

    Chun Wang; Zhi Zeng; Xi-Han Li

    2014-12-30

    We propose two controlled remote state preparation protocols via partially entangled channels. One prepares a single-qubit state and the other prepares a two-qubit state. Different from other controlled remote state preparation schemes which also utilize partially entangled channels, neither auxiliary qubits nor two-qubit unitary transformations are required in our schemes and the success probabilities are independent of the coefficients of the quantum channel. The success probabilities are 50% and 25% for arbitrary single-qubit states and two-qubit states, respectively. We also show that the success probabilities can reach 100% for restricted classes of states.

  9. Channeling of intense laser beams in underdense plasmas

    SciTech Connect (OSTI)

    Feit, M.D.; Garrison, J.C.; Rubenchik, A.M.

    1997-09-01

    A hydrodynamic simulation is used to show that intense laser pulses propagating in underdense plasmas create stable, long-lived, and completely evacuated channels. At low intensities, I=10{sup 17} W/cm{sup 2}, self focusing seriously distorts the temporal envelope of the pulse, but channeling still occurs. At high intensities, I=10{sup 19} W/cm{sup 2}, channeling can proceed over many diffraction lengths with significant distortion restricted to the leading edge of the pulse. {copyright} {ital 1997} {ital The American Physical Society}

  10. Turbine component cooling channel mesh with intersection chambers

    DOE Patents [OSTI]

    Lee, Ching-Pang; Marra, John J

    2014-05-06

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

  11. Roderick MacKinnon and Ion Channels - Potassium Channels and Sodium

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield MunicipalTechnical Report:Speeding access toSmall ReactorRaymond Davis,Robert Curl, Jr.Channels

  12. Feedback between erosional morphology, sediment transport and abrasion in the transient adjustment of fluvial bedrock channels

    E-Print Network [OSTI]

    Johnson, Joel Peterson

    2007-01-01

    This thesis explores the dependence of bedrock channel incision on coarse sediment supply through laboratory flume experiments and quantitative field observations of evolving channel morphology. Predictions of the ...

  13. Analysis of powder compaction process through equal channel angular extrusion 

    E-Print Network [OSTI]

    Kaushik, Anshul

    2009-05-15

    A thermodynamic framework was presented for the development of powderconstitutive models. The process of powder compaction through Equal ChannelAngular Extrusion (ECAE) at room temperature was modeled using the finiteelement ...

  14. Dynamic channel allocation in satellite and wireless networks

    E-Print Network [OSTI]

    Sun, Jun, 1975-

    2007-01-01

    The objective of this thesis is to understand how to utilize wireless channels in a fair and efficient manner within a multi-users communication environment. We start by exploring the allocation of a single wireless downlink ...

  15. Return channel loss reduction in multi-stage centrifugal compressors

    E-Print Network [OSTI]

    Aubry, Anne-Raphaëlle

    2012-01-01

    This thesis presents concepts for improving the performance of return channels in multi-stage centrifugal compressors. Geometries have been developed to reduce both separation and viscous losses. A number of different ...

  16. Exploiting Temporal Persistence to Detect Covert Botnet Channels

    E-Print Network [OSTI]

    Bermond, Jean-Claude

    bot-herder). The recruited end-hosts (also called drones or zombies) are marshalled and controlled between the drone and bot-herder, so as to deactivate the channel and render the drone useless. More

  17. On the Capacity of Cognitive Relay assisted Gaussian Interference Channel

    E-Print Network [OSTI]

    Jafar, Syed A.

    On the Capacity of Cognitive Relay assisted Gaussian Interference Channel Sriram Sridharan, Sriram: srid- hara@ece.utexas.edu; sriram@ece.utexas.edu). S. Sridharan and S. Vish- wanath are supported

  18. On the Capacity of Vector Gaussian Interference Channels Sriram Vishwanath

    E-Print Network [OSTI]

    Jafar, Syed A.

    On the Capacity of Vector Gaussian Interference Channels Sriram Vishwanath Electrical and Computer Engineering Univ. of Texas at Austin, Austin, TX 78712 e-mail: sriram@ece.utexas.edu Syed Ali Jafar Electrical

  19. Evolution of a Compound Channel: Tassajara Creek, Dublin, California

    E-Print Network [OSTI]

    Butler, Nathaniel L.; Nolan, Lindsey

    2007-01-01

    channel was braided upstream and downstream of this cross-cross- sections upstream and downstream by Oden and DeHollanchannel was braided upstream and downstream of this cross-

  20. Outage Capacity and Code Design for Dying Channels 

    E-Print Network [OSTI]

    Zeng, Meng

    2012-10-19

    channel length. First, we study the outage probability when the coding length K is fixed and uniform power allocation is assumed. Furthermore, we discuss the optimization over K and the power allocation vector PK to minimize the outage probability...

  1. Microbubble drag reduction phenomenon study in a channel flow 

    E-Print Network [OSTI]

    Jimenez Bernal, Jose Alfredo

    2005-11-01

    An experimental study on drag reduction by injection of microbubbles was performed in the upper wall of a rectangular channel at Re = 5128. Particle Image Velocimetry measurement technique (PIV) was used to obtain instantaneous ...

  2. Coding along hermite polynomials for gaussian noise channels

    E-Print Network [OSTI]

    Abbe, Emmanuel A.

    This paper shows that the capacity achieving input distribution for a fading Gaussian broadcast channel is not Gaussian in general. The construction of non-Gaussian distributions that strictly outperform Gaussian ones, for ...

  3. Tsallis Entropy Based Velocity Distribution in Open Channel Flows 

    E-Print Network [OSTI]

    Luo, Hao

    2010-07-14

    The Tsallis entropy is applied to derive both 1-D and 2-D velocity distributions in an open channel cross section. These distributions contain a parameter m through which the Tsallis entropy becomes a generalization of the Shannon entropy. Different...

  4. Natural convection flows in parallel connected vertical channels with boiling

    E-Print Network [OSTI]

    Eselgroth, Peter Ward

    1967-01-01

    The steady-state flow configuration in an array of parallel heated channels is examined with the objective of predicting the behavior of a reactor during a loss of flow accident. A method of combining the results of single ...

  5. Heat Transfer Enhancement in Rectangular Channel with Compound Cooling Techniques 

    E-Print Network [OSTI]

    Krad, Belal

    2013-11-27

    to analyze heat transfer and pressure loss characteristics to determine which configuration had the overall best performance. Two different flow configurations were considered, a uniform channel flow setup as well as a jet impingement setup. There were a...

  6. A comparative study of Rayleigh fading wireless channel simulators 

    E-Print Network [OSTI]

    Sathini Ramaswamy, Vishnu Raghavan

    2006-04-12

    Computer simulation is now increasingly being used for design and performance evaluation of communication systems. When simulating a mobile wireless channel for communication systems, it is usually assumed that the fading process is a random variate...

  7. Ergodic Secret Alignment for the Fading Multiple Access Wiretap Channel

    E-Print Network [OSTI]

    Ulukus, Sennur

    Ergodic Secret Alignment for the Fading Multiple Access Wiretap Channel Raef Bassily Sennur Ulukus a technique (on top of Gaussian signaling) that uses the power of a non-transmitting node in jamming

  8. Optimal finite alphabet sources over partial response channels 

    E-Print Network [OSTI]

    Kumar, Deepak

    2004-11-15

    We present a serially concatenated coding scheme for partial response channels. The encoder consists of an outer irregular LDPC code and an inner matched spectrum trellis code. These codes are shown to offer considerable ...

  9. Steam Generator Group Project. Task 6. Channel head decontamination

    SciTech Connect (OSTI)

    Allen, R.P.; Clark, R.L.; Reece, W.D.

    1984-08-01

    The Steam Generator Group Project utilizes a retired-from-service pressurized-water-reactor steam generator as a test bed and source of specimens for research. An important preparatory step to primary side research activities was reduction of the radiation field in the steam generator channel head. This task report describes the channel head decontamination activities. Though not a programmatic research objective it was judged beneficial to explore the use of dilute reagent chemical decontamination techniques. These techniques presented potential for reduced personnel exposure and reduced secondary radwaste generation, over currently used abrasive blasting techniques. Two techniques with extensive laboratory research and vendors prepared to offer commercial application were tested, one on either side of the channel head. As indicated in the report, both techniques accomplished similar decontamination objectives. Neither technique damaged the generator channel head or tubing materials, as applied. This report provides details of the decontamination operations. Application system and operating conditions are described.

  10. Wideband Channel Sounding Techniques for Dynamic Spectrum Access Networks

    E-Print Network [OSTI]

    Chen, Qi

    2009-01-01

    large bandwidth with minimal interference. It is based on the STDCC channel sounder and Multicarrier Direct Sequence Code Division Multiple Access (MC-DS-CDMA) technique. The STDCC technique, defined by Parsons [2], was first employed by Cox...

  11. Consolidation of aluminum 6061 powder by equal channel angular extrusion 

    E-Print Network [OSTI]

    Pearson, John Montgomery

    1997-01-01

    Equal channel angular extrusion is a promising approach to obtaining full density in powder metallurgy applications. This method can impose large effective deformations through uniform shear strain. Aluminum alloy 6061 powder is used as a test...

  12. Multilevel trellis coded modulation for the fading channel 

    E-Print Network [OSTI]

    Tung, Chien-Cheng

    1993-01-01

    Trellis coded modulation (TCM) has been applied to the fading channel recently [11-[3]. Among these articles, Divsalar and Simon showed in their papers that the length of the shortest error path and the product of the ...

  13. Design and analysis of iteratively decodable codes for ISI channels 

    E-Print Network [OSTI]

    Doan, Dung Ngoc

    2005-11-01

    Recent advancements in iterative processing have allowed communication systems to perform close to capacity limits withmanageable complexity.For manychannels such as the AWGN and ?at fading channels, codes that ...

  14. Nonlinear acoustic waves in channels with variable cross sections

    E-Print Network [OSTI]

    Vladimir F. Kovalev; Oleg V. Rudenko

    2012-11-02

    The point symmetry group is studied for the generalized Webster-type equation describing non-linear acoustic waves in lossy channels with variable cross sections. It is shown that, for certain types of cross section profiles, the admitted symmetry group is extended and the invariant solutions corresponding to these profiles are obtained. Approximate analytic solutions to the generalized Webster equation are derived for channels with smoothly varying cross sections and arbitrary initial conditions.

  15. UWB channel estimation using new generating TR transceivers

    DOE Patents [OSTI]

    Nekoogar, Faranak (San Ramon, CA); Dowla, Farid U. (Castro Valley, CA); Spiridon, Alex (Palo Alto, CA); Haugen, Peter C. (Livermore, CA); Benzel, Dave M. (Livermore, CA)

    2011-06-28

    The present invention presents a simple and novel channel estimation scheme for UWB communication systems. As disclosed herein, the present invention maximizes the extraction of information by incorporating a new generation of transmitted-reference (Tr) transceivers that utilize a single reference pulse(s) or a preamble of reference pulses to provide improved channel estimation while offering higher Bit Error Rate (BER) performance and data rates without diluting the transmitter power.

  16. The environmental management of a ship channel-harbor complex 

    E-Print Network [OSTI]

    Reavis, Marvin William

    1976-01-01

    the Environmental Management of a Ship Channel-Harbor Complex 120 12g LIST OF FIGURES ~Fi ure 1 Major Ports of the Texas Gulf Coast Oil Spills by County, January 1973? November 1974 . Causes of Spills by Incident and Volume, January 1973 - November 1974.... Ouantity of Oil Spilled by Cause, January 1973 - November 1974. Expected Shape of 50, 000 Barrel/Day Spill After Four Hours. Dissolved Oxygen Profile Corpus Christi Inner Harbor. Dissolved Oxygen Profile Corpus Christi Ship Channel. Station...

  17. Historical Response of the Wakarusa River Channel to Anthropogenic Influences

    E-Print Network [OSTI]

    Woodburn, Terri Lee

    2008-05-13

    and exogenic variables differ slightly among these authors, but contain the same essential components: geology, climate, vegetation, local and basin-wide hydraulic conditions, and drainage basin morphology. Channel variables are inter-related, creating a... that ?the notion of adjustment and equilibrium implies that alluvial channels could be altered by significant manmade modifications, such as dams, in the regimen of water and sediment delivered?. When studying a fluvial system affected by human...

  18. Physiology and Regulation of Calcium Channels in Stomatal Guard Cells

    SciTech Connect (OSTI)

    Schroeder, Julian I.

    2007-05-02

    Stomatal pores in the epidermis of leaves regulate the diffusion of CO2 into leaves for photosynthetic carbon fixation and control water loss of plants during drought periods. Guard cells sense CO2, water status, light and other environmental conditions to regulate stomatal apertures for optimization of CO2 intake and plant growth under drought stress. The cytosolic second messenger calcium contributes to stomatal movements by transducing signals and regulating ion channels in guard cells. Studies suggest that both plasma membrane Ca2+ influx channels and vacuolar/organellar Ca2+ release channels contribute to ABA-induced Ca2+ elevations in guard cells. Recent research in the P.I.'s laboratory has led to identification of a novel major cation-selective Ca2+-permeable influx channel (Ica) in the plasma membrane of Arabidopsis guard cells. These advances will allow detailed characterization of Ica plasma membrane Ca2+ influx channels in guard cells. The long term goal of this research project is to gain a first detailed characterization of these novel plasma membrane Ca2+-permeable channel currents in Arabidopsis guard cells. The proposed research will investigate the hypothesis that Ica represents an important Ca2+ influx pathway for ABA and CO2 signal transduction in Arabidopsis guard cells. These studies will lead to elucidation of key signal transduction mechanisms by which plants balance CO2 influx into leaves and transpirational water loss and may contribute to future strategies for manipulating gas exchange for improved growth of crop plants and for biomass production.

  19. Laser pulse propagation in inhomogeneous magnetoplasma channels and wakefield acceleration

    SciTech Connect (OSTI)

    Sharma, B. S., E-mail: bs-phy@yahoo.com; Jain, Archana [Government College Kota, Kota 324001 (India)] [Government College Kota, Kota 324001 (India); Jaiman, N. K. [Department of Pure and Applied Physics, University of Kota, Kota 324010 (India)] [Department of Pure and Applied Physics, University of Kota, Kota 324010 (India); Gupta, D. N. [Department of Physics and Astrophysics, University of Delhi, Delhi 110007 (India)] [Department of Physics and Astrophysics, University of Delhi, Delhi 110007 (India); Jang, D. G.; Suk, H. [Department of Physics and Photon Science, Gwangju Institute of Science and Technology, Gwangju 500-712 (Korea, Republic of)] [Department of Physics and Photon Science, Gwangju Institute of Science and Technology, Gwangju 500-712 (Korea, Republic of); Kulagin, V. V. [Sternberg Astronomical Institute of Moscow State University, Moscow 119992 (Russian Federation)] [Sternberg Astronomical Institute of Moscow State University, Moscow 119992 (Russian Federation)

    2014-02-15

    Wakefield excitation in a preformed inhomogeneous parabolic plasma channel by an intense relativistic (?10{sup 19}?W/cm{sup 2}) circularly polarized Gaussian laser pulse is investigated analytically and numerically in the presence of an external longitudinal magnetic field. A three dimensional envelope equation for the evolution of the laser pulse is derived, which includes the effect of the nonparaxial and applied external magnetic field. A relation for the channel radius with the laser spot size is derived and examines numerically to see the external magnetic field effect. It is observed that the channel radius depends on the applied external magnetic field. An analytical expression for the wakefield is derived and validated with the help of a two dimensional particle in cell (2D PIC) simulation code. It is shown that the electromagnetic nature of the wakes in an inhomogeneous plasma channel makes their excitation nonlocal, which results in change of fields with time and external magnetic field due to phase mixing of the plasma oscillations with spatially varying frequencies. The magnetic field effect on perturbation of the plasma density and decreasing length is also analyzed numerically. In addition, it has been shown that the electron energy gain in the inhomogeneous parabolic magnetoplasma channel can be increased significantly compared with the homogeneous plasma channel.

  20. he defining element of modern wind farms is the pro-peller-like structure known as a horizontal-axis wind

    E-Print Network [OSTI]

    Dabiri, John O.

    T he defining element of modern wind farms is the pro- peller-like structure known as a horizontal-axis wind turbine.Amarvel of engineering, the HAWT typically comprises more than 8000 parts, and its blades it converts wind energy into electricity. In 1920 Albert Betz derived a theoretical limit on that efficiency