Powered by Deep Web Technologies
Note: This page contains sample records for the topic "vertical cross-polar channel" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

Square-wave switching by crossed-polarization gain modulation in vertical-cavity semiconductor lasers  

Science Conference Proceedings (OSTI)

We study experimentally and theoretically the effects of crossed-polarization reinjection (XPR) on the output characteristics of a vertical-cavity semiconductor laser. We find a set of parameters values for which each polarization component develops a square-wave modulation at a period close to twice the reinjection delay. We analyze the regularity of this modulation in terms of the laser pumping current and of the reinjection level. These observations are numerically reproduced within the spin-flip model modified to account for XPR. In particular, the degradation of the square-wave switching is linked to the finite value of the spin-flip rate, and it occurs when the current approaches the boundaries of polarization bistability.

Mulet, J.; Giudici, M.; Javaloyes, J.; Balle, S. [Institut Mediterrani d'Estudis Avancats, CSIC UIB, E-07071 Palma de Mallorca (Spain)

2007-10-15T23:59:59.000Z

2

Orthogonal Channel Coding for Simultaneous Co- and Cross-Polarization Measurements  

Science Conference Proceedings (OSTI)

Dual-polarization weather radars typically measure the radar reflectivity at more than one polarization state for transmission and reception. Historically, dual-polarization radars have been operated at copolar and cross-polar states defined with ...

V. Chandrasekar; Nitin Bharadwaj

2009-01-01T23:59:59.000Z

3

One-Lag Estimators for Cross-Polarization Measurements  

Science Conference Proceedings (OSTI)

Estimators of the linear depolarization ratio (LDR) and cross-polarization correlation coefficients (?xh) free from noise biases are devised. The estimators are based on the 1-lag correlation functions. The 1-lag estimators can be implemented ...

Valery M. Melnikov

2006-07-01T23:59:59.000Z

4

24-CHANNEL GEOPHONE ARRAY FOR HORIZONTAL OR VERTICAL BOREHOLES  

SciTech Connect

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.

Erik C. Westman

2003-10-24T23:59:59.000Z

5

Experimental study of natural convective heat transfer in a vertical hexagonal sub channel  

Science Conference Proceedings (OSTI)

The development of new practices in nuclear reactor safety aspects and optimization of recent nuclear reactors, including the APWR and the PHWR reactors, needs a knowledge on natural convective heat transfer within sub-channels formed among several nuclear fuel rods or heat exchanger tubes. Unfortunately, the currently available empirical correlation equations for such heat transfer modes are limited and researches on convective heat transfer within a bundle of vertical cylinders (especially within the natural convection modes) are scarcely done. Although boundary layers around the heat exchanger cylinders or fuel rods may be dominated by their entry regions, most of available convection correlation equations are for fully developed boundary layers. Recently, an experimental study on natural convective heat transfer in a subchannel formed by several heated parallel cylinders that arranged in a hexagonal configuration has been being done. The study seeks for a new convection correlation for the natural convective heat transfer in the sub-channel formed among the hexagonal vertical cylinders. A new convective heat transfer correlation equation has been obtained from the study and compared to several similar equations in literatures.

Tandian, Nathanael P.; Umar, Efrizon; Hardianto, Toto; Febriyanto, Catur [Faculty of Mechanical and Aerospace Engineering, Institut Teknologi Bandung, Jl. Ganesa 10, Bandung 40132 (Indonesia); Nuclear Technology Center for Materials and Radiometry, National Nuclear Energy Agency, Bandung (Indonesia); Faculty of Mechanical and Aerospace Engineering, Institut Teknologi Bandung, Jl. Ganesa 10, Bandung 40132 (Indonesia); Nuclear Energy Regulation Agency, Jakarta (Indonesia)

2012-06-06T23:59:59.000Z

6

Developing a power-efficient and low-cost 3D NoC using smart GALS-based vertical channels  

Science Conference Proceedings (OSTI)

Shorter global interconnects enable 3D NoC structures to offer higher performance, improved packaging density, and lower interconnect power consumption to CMPs and SoCs compared to their 2D counterparts. However, substantial challenges such as high peak ... Keywords: 3D Networks-on-Chip, Bidirectional Bisynchronous Vertical Channels, Forecasting-based dynamic power management

Amir-Mohammad Rahmani; Pasi Liljeberg; Juha Plosila; Hannu Tenhunen

2013-06-01T23:59:59.000Z

7

Dependence of the cross polar cap potential saturation on the type of solar wind streams  

E-Print Network (OSTI)

We compare of the cross polar cap potential (CPCP) saturation during magnetic storms induced by various types of the solar wind drivers. By using the model of Siscoe-Hill \\citep{Hilletal1976,Siscoeetal2002a,Siscoeetal2002b,Siscoeetal2004,Siscoe2011} we evaluate criteria of the CPCP saturation during the main phases of 257 magnetic storms ($Dst_{min} \\le -50$ nT) induced by the following types of the solar wind streams: magnetic clouds (MC), Ejecta, the compress region Sheath before MC ($Sh_{MC}$) and before Ejecta ($Sh_{E}$), corotating interaction regions (CIR) and indeterminate type (IND). Our analysis shows that occurrence rate of the CPCP saturation is higher for storms induced by ICME ($13.2%$) than for storms driven by CIR ($3.5%$) or by IND ($3.5%$).The CPCP saturation was obtained more often for storms initiated by MC ($25%$) than by Ejecta ($2.9%$); it was obtained for $8.6%$ of magnetic storms induced by sum of MC and Ejecta, and for $21.5%$ magnetic storms induced by Sheath before them (sum of $Sh_...

Nikolaeva, N S; Lodkina, I G

2013-01-01T23:59:59.000Z

8

Sensitivity of ray dynamics in an underwater sound channel to vertical scale of longitudinal sound-speed variations  

E-Print Network (OSTI)

We investigate sound ray propagation in a range-dependent underwater acoustic waveguide. Our attention is focused on sensitivity of ray dynamics to the vertical structure of a sound-speed perturbation induced by ocean internal waves. Two models of longitudinal sound-speed variations are considered: a periodic inhomogeneity and a stochastic one. It is found that vertical oscillations of a sound-speed perturbation can affect rays in a resonant manner. Such resonances give rise to chaos in certain regions of phase space. It is shown that stability of steep rays, being observed in experiments, is connected with suppression of resonances in the case of small-scale vertical sound-speed oscillations.

D. V. Makarov; M. Yu. Uleysky; M. Yu. Martynov

2005-08-31T23:59:59.000Z

9

VERTICAL GARDEN DIY CHECKLIST  

E-Print Network (OSTI)

VERTICAL GARDEN DIY CHECKLIST Vertical greenery is not a new concept; it dates back thousands-growingvarietiesbecome established. Theneedforpermissionfromcouncil, strataetc. #12;VERTICAL GARDEN DIY CHECKLIST THE PLAN

Peters, Richard

10

Horizontal and Vertical Structure of the Lake Turkana Jet  

Science Conference Proceedings (OSTI)

An observational study was undertaken at selected sites in north Kenya (Turkana channel) in February 1983 and in June–July 1984 to investigate the horizontal and vertical extent of the Turkana low-level jet. Observations indicate that strong ...

Joseph Hiri Kinuthia

1992-11-01T23:59:59.000Z

11

Vertical axis wind turbines  

DOE Patents (OSTI)

A vertical axis wind turbine is described. The wind turbine can include a top ring, a middle ring and a lower ring, wherein a plurality of vertical airfoils are disposed between the rings. For example, three vertical airfoils can be attached between the upper ring and the middle ring. In addition, three more vertical airfoils can be attached between the lower ring and the middle ring. When wind contacts the vertically arranged airfoils the rings begin to spin. By connecting the rings to a center pole which spins an alternator, electricity can be generated from wind.

Krivcov, Vladimir (Miass, RU); Krivospitski, Vladimir (Miass, RU); Maksimov, Vasili (Miass, RU); Halstead, Richard (Rohnert Park, CA); Grahov, Jurij (Miass, RU)

2011-03-08T23:59:59.000Z

12

ARM - Measurement - Vertical velocity  

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

govMeasurementsVertical velocity govMeasurementsVertical velocity ARM Data Discovery Browse Data Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Measurement : Vertical velocity The component of the velocity vector, along the local vertical. Categories Atmospheric State Instruments The above measurement is considered scientifically relevant for the following instruments. Refer to the datastream (netcdf) file headers of each instrument for a list of all available measurements, including those recorded for diagnostic or quality assurance purposes. ARM Instruments CO2FLX : Carbon Dioxide Flux Measurement Systems ECOR : Eddy Correlation Flux Measurement System KAZR : Ka ARM Zenith Radar MMCR : Millimeter Wavelength Cloud Radar SODAR : Mini Sound Detection and Ranging

13

Vertically Rising Microstructure Profiler  

Science Conference Proceedings (OSTI)

The vertically rising microstructure profiler was designed to measure temperature gradient and conductivity gradient microstructure in lakes, reservoirs and coastal seas. The instrument is totally independent of surface craft while collecting ...

G. D. Carter; J. Imberger

1986-09-01T23:59:59.000Z

14

Vertical Velocity Focus Group  

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

Velocity Focus Group Velocity Focus Group ARM 2008 Science Team Meeting Norfolk, VA March 10-14 Background Vertical velocity measurements have been at the top of the priority list of the cloud modeling community for some time. Doppler measurements from ARM profiling radars operating at 915-MHz, 35-GHz and 94-GHz have been largely unexploited. The purpose of this new focus group is to develop vertical velocity ARM products suitable for modelers. ARM response to their request has been slow. Most ARM instruments are suitable for cloud observations and have limited capabilities in precipitation Using ARM datasets for evaluating and improving cloud parameterization in global climate models (GCMs) is not straightforward, due to gigantic scale mismatches. Consider this... Looking only vertically drastically limits opportunities

15

Composite Vertical Structure of Vertical Velocity in Nonprecipitating Cumulus Clouds  

Science Conference Proceedings (OSTI)

Vertical transects of Doppler vertical velocity data, obtained from an airborne profiling millimeter-wave cloud radar, are composited for a large number of cumulus clouds (Cu) at various stages of their life cycle, to examine typical circulations ...

Yonggang Wang; Bart Geerts

2013-05-01T23:59:59.000Z

16

Citizens and Service Channels: Channel Choice and Channel Management Implications  

Science Conference Proceedings (OSTI)

The arrival of electronic channels in the 1990s has had a huge impact on governmental service delivery. The new channels have led to many new opportunities to improve public service delivery, not only in terms of citizen satisfaction, but also in cost ... Keywords: Channel Behavior, Channel Choice, Channel Usage, Multi-Channel Management, Public Service Delivery, Service Channels, e-Government

Willem Pieterson

2010-04-01T23:59:59.000Z

17

Sensitivity of the Surface Equatorial Ocean to the Parameterization of Vertical Mixing  

Science Conference Proceedings (OSTI)

This study investigates the sensitivity of the dynamics of the surface equatorial ocean to the parameterization of vertical mixing. A new high-resolution, numerical model of a zonally independent equatorial channel helps to explore this question ...

Niklas Schneider; Peter Müller

1994-07-01T23:59:59.000Z

18

Vertical Coordinate Transformation of Vertically-Discretized Atmospheric Fields  

Science Conference Proceedings (OSTI)

The problem of transforming fields of atmospheric variables from one vertical coordinate system to another without altering their dynamic balance is discussed. A curve fitting scheme applied to the data points in each grid column is proposed ...

Rainer Bleck

1984-12-01T23:59:59.000Z

19

Carderock Circulating Water Channel | Open Energy Information  

Open Energy Info (EERE)

Circulating Water Channel Circulating Water Channel Jump to: navigation, search Basic Specifications Facility Name Carderock Circulating Water Channel Overseeing Organization United States Naval Surface Warfare Center Hydrodynamic Testing Facility Type Channel Length(m) 18.3 Beam(m) 6.7 Depth(m) 2.7 Water Type Freshwater Cost(per day) Contact POC Special Physical Features The Circulating Water Channel is a vertical plane, open to the atmosphere test section with a free surface in a closed recirculating water circuit, variable speed, rectangular cross-sectional shape facility. There are 10 large viewing windows on either side of the test section at different elevations and 9 in the bottom; movable bridge spans the test section for ease and versatility in mounting models, rigging bridge is capable of taking towing loads at any one of numerous points up to 35,584 N

20

Vertical axis wind turbine airfoil  

DOE Patents (OSTI)

A vertical axis wind turbine airfoil is described. The wind turbine airfoil can include a leading edge, a trailing edge, an upper curved surface, a lower curved surface, and a centerline running between the upper surface and the lower surface and from the leading edge to the trailing edge. The airfoil can be configured so that the distance between the centerline and the upper surface is the same as the distance between the centerline and the lower surface at all points along the length of the airfoil. A plurality of such airfoils can be included in a vertical axis wind turbine. These airfoils can be vertically disposed and can rotate about a vertical axis.

Krivcov, Vladimir; Krivospitski, Vladimir; Maksimov, Vasili; Halstead, Richard; Grahov, Jurij Vasiljevich

2012-12-18T23:59:59.000Z

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


21

On the coordination of dynamic marketing channels and two-part tariffs  

Science Conference Proceedings (OSTI)

An important result in a static marketing channel is that the manufacturer can reach the vertically integrated channel solution through the use of a two-part wholesale price. This means that the collectively optimal solution is achieved in a decentralized ... Keywords: Coordination, Differential games, Marketing channels, Two-part tariff

Georges Zaccour

2008-05-01T23:59:59.000Z

22

Definition: Vertical Flowmeter Test | Open Energy Information  

Open Energy Info (EERE)

Edit with form History Facebook icon Twitter icon Definition: Vertical Flowmeter Test Jump to: navigation, search Dictionary.png Vertical Flowmeter Test A well testing...

23

Vertical Flowmeter Logging | Open Energy Information  

Open Energy Info (EERE)

2013 DOI Not Provided Check for DOI availability: http:crossref.org Online Internet link for Vertical Flowmeter Logging Citation U.S. Geological Survey. Vertical...

24

Construction of Channels (Indiana)  

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

25

Kinematic Fitting of Detached Vertices  

SciTech Connect

The eg3 experiment at the Jefferson Lab CLAS detector aims to determine the existence of the $\\Xi_{5}$ pentaquarks and investigate the excited $\\Xi$ states. Specifically, the exotic $\\Xi_{5}^{--}$ pentaquark will be sought by first reconstructing the $\\Xi^{-}$ particle through its weak decays, $\\Xi^{-}\\to\\pi^{-}\\Lambda$ and $\\Lambda\\to\\pi^{-}$. A kinematic fitting routine was developed to reconstruct the detached vertices of these decays, where confidence level cuts on the fits are used to remove background events. Prior to fitting these decays, the exclusive reaction $\\gamma D\\rightarrow pp\\pi^{-}$ was studied in order to correct the track measurements and covariance matrices of the charged particles. The $\\Lambda\\rightarrow p\\pi^{-}$ and $\\Xi^{-}\\to\\pi^{-}\\Lambda$ decays were then investigated to demonstrate that the kinematic fitting routine reconstructs the decaying particles and their detached vertices correctly.

Paul Mattione

2007-05-01T23:59:59.000Z

26

Vertical Flow Wetland Pilot Study  

Science Conference Proceedings (OSTI)

This is an interim report to present the preliminary results of a study conducted by Duke Energy to test the potential effectiveness of vertical flow wetlands (VFWs) for the removal of selenium, mercury, and other related compounds from a flue gas desulfurization (FGD) discharge. These compounds commonly are found in and regulated for coal-fired utility water discharges. There is a widespread need for a cost-effective alternative to physiochemical treatment to maintain compliance for these parameters, on...

2008-12-08T23:59:59.000Z

27

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

Science Conference Proceedings (OSTI)

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

Youyu Lu; Rolf G. Lueck

1999-11-01T23:59:59.000Z

28

Conjugate Effects on Steady Laminar Natural Convection Heat Transfer in Vertical Eccentric Annuli  

E-Print Network (OSTI)

Local heat flux on outer interface at channel exit i Index for bi-polar grid in the -directionConjugate Effects on Steady Laminar Natural Convection Heat Transfer in Vertical Eccentric Annuli University of Petroleum and Minerals, Dhahran, Saudi Arabia Combined conduction-free convection heat transfer

Jamal, Ahmad

29

Vertically Aligned Nanocomposite Thin Films  

E-Print Network (OSTI)

Vertically aligned nanocomposite (VAN) thin films have recently stimulated significant research interest to achieve better material functionality or multifunctionalities. In VAN thin films, both phases grow epitaxially in parallel on given substrates and form a unique nano-checkerboard structure. Multiple strains, including the vertical strain which along the vertical interface and the substrate induced strain which along the film and substrate interface, exist in VAN thin films. The competition of these strains gives a promise to tune the material lattice structure and future more the nanocomposite film physical properties. Those two phases in the VAN thin films are selected based on their growth kinetics, thermodynamic stability and epitaxial growth ability on given substrates. In the present work, we investigated unique epitaxial two-phase VAN (BiFeO3)x:(Sm2O3)1-x and (La0.7Sr0.3MnO3)x:(Mn3O4)1-x thin film systems by pulsed laser deposition. These VAN thin films exhibit a highly ordered vertical columnar structure with good epitaxial quality. The strain of the two phases can be tuned by deposition parameters, e.g. deposition frequency and film composition. Their strain tunability is found to be related directly to the systematic variation of the column widths and domain structures. Their physical properties, such as dielectric loss and ferromagnetisms can be tuned systematically by this variation. The growth morphology, microstructure and material functionalities of VAN thin films can be varied by modifying the phase ratio, substrate orientation or deposition conditions. Systematic study has been done on growing (SrTiO3)0.5:(MgO)0.5 VAN thin films on SrTiO3 and MgO substrates, respectively. The variation of column width demonstrates the substrate induced strain plays another important role in the VAN thin film growth. The VAN thin films also hold promise in achieving porous thin films with ordered nanopores by thermal treatment. We selected (BiFeO3)0.5:(Sm2O3)0.5 VAN thin films as a template and get uniformly distributed bi-layered nanopores. Controllable porosity can be achieved by adjusting the microstructure of VAN (BiFeO3):(Sm2O3) thin films and the annealing parameters. In situ heating experiments within a transmission electron microscope column provide direct observations into the phases transformation, evaporation and structure reconstruction during the annealing. Systematic study in this dissertation demonstrate that the vertically aligned nanocomposite microstructure is a brand new architecture in thin films and an exciting approach that promises tunable material functionalities as well as novel nanostructures.

Bi, Zhenxing

2011-05-01T23:59:59.000Z

30

Determining Vertical Water Velocities from Seaglider  

Science Conference Proceedings (OSTI)

Vertical velocities in the world’s oceans are typically small, less than 1 cm s?1, posing a significant challenge for observational techniques. Seaglider, an autonomous profiling instrument, can be used to estimate vertical water velocity in the ...

Eleanor Frajka-Williams; Charles C. Eriksen; Peter B. Rhines; Ramsey R. Harcourt

2011-12-01T23:59:59.000Z

31

Vertical Motion of Neutrally Buoyant Floats  

Science Conference Proceedings (OSTI)

The vertical motion of a neutrally buoyant float is determined from the solution to the nonlinear forced harmonic oscillator equation originally set forth by Voorhis. Float response to forced vertical oscillations is characterized by the response ...

Louis Goodman; Edward R. Levine

1990-02-01T23:59:59.000Z

32

Vertical Normal Mode Transforms: Theory and Application  

Science Conference Proceedings (OSTI)

The separation of the vertical structure of the, solutions of the primitive (hydrostatic) meteorological equations is formalized as a vertical normal-mode transform. The transform is implemented for arbitrary static stability profiles by the ...

Scott R. Fulton; Wayne H. Schubert

1985-04-01T23:59:59.000Z

33

A Simple Protocol to Communicate Channels over Channels  

Science Conference Proceedings (OSTI)

In this paper we present the communication protocol that we use to implement first class channels. Ordinary channels allow data communication (like CSP/Occam); first class channels allow communicating channel ends over a channel. This enables processes ...

Henk L. Muller; David May

1998-09-01T23:59:59.000Z

34

Vertically Aligned and Periodically Distributed Carbon Nanotube  

Science Conference Proceedings (OSTI)

Presentation Title, Vertically Aligned and Periodically Distributed Carbon Nanotube (CNT) ... Application of Carbon Nanotubes – Energy to Bioelectronic Sensor.

35

Vertical Circuits Inc | Open Energy Information  

Open Energy Info (EERE)

Circuits Inc Circuits Inc Jump to: navigation, search Name Vertical Circuits, Inc. Place Scotts Valley, California Zip 95066 Sector Services Product Vertical Circuits Inc. is a global supplier of advanced die level vertical interconnect packaging technology, products, services and intellectual property for the manufacture of low cost ultra high-speed/high-density semiconductor components. References Vertical Circuits, Inc.[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Vertical Circuits, Inc. is a company located in Scotts Valley, California . References ↑ "Vertical Circuits, Inc." Retrieved from "http://en.openei.org/w/index.php?title=Vertical_Circuits_Inc&oldid=352802"

36

Vertical feed stick wood fuel burning furnace system  

DOE Patents (OSTI)

A new and improved stove or furnace for efficient combustion of wood fuel including a vertical feed combustion chamber for receiving and supporting wood fuel in a vertical attitude or stack, a major upper portion of the combustion chamber column comprising a water jacket for coupling to a source of water or heat transfer fluid and for convection circulation of the fluid for confining the locus of wood fuel combustion to the bottom of the vertical gravity feed combustion chamber. A flue gas propagation delay channel extending from the laterally directed draft outlet affords delayed travel time in a high temperature environment to assure substantially complete combustion of the gaseous products of wood burning with forced air as an actively induced draft draws the fuel gas and air mixture laterally through the combustion and high temperature zone. Active sources of forced air and induced draft are included, multiple use and circuit couplings for the recovered heat, and construction features in the refractory material substructure and metal component superstructure.

Hill, Richard C. (Orono, ME)

1984-01-01T23:59:59.000Z

37

Fading channel simulator  

DOE Patents (OSTI)

This invention relates to high frequency (HF) radio signal propagation through fading channels and, more particularly, to simulation of fading channels in order to characterize HF radio system performance in transmitting and receiving signals through such fading channels. Fading channel effects on a transmitted communication signal are simulated with both frequency and time variations using a channel scattering function to affect the transmitted signal. A conventional channel scattering function is converted to a series of channel realizations by multiplying the square root of the channel scattering function by a complex number of which the real and imaginary parts are each independent variables. The two-dimensional inverse-FFT of this complex-valued channel realization yields a matrix of channel coefficients that provide a complete frequency-time description of the channel. The transmitted radio signal is segmented to provide a series of transmitted signal and each segment is subject to FFT to generate a series of signal coefficient matrices. The channel coefficient matrices and signal coefficient matrices are then multiplied and subjected to inverse-FFT to output a signal representing the received affected radio signal. A variety of channel scattering functions can be used to characterize the response of a transmitter-receiver system to such atmospheric effects.

Argo, P.E.; Fitzgerald, T.J.

1991-12-31T23:59:59.000Z

38

Fidelity of Gaussian Channels  

Science Conference Proceedings (OSTI)

A noisy Gaussian channel is defined as a channel in which an input field mode is subjected to random Gaussian displacements in phase space. We introduce the quantum fidelity of a Gaussian channel for pure and mixed input states, and we derive a universal ...

Carlton M. Caves; Krzysztof Wódkiewicz

2004-12-01T23:59:59.000Z

39

Integration of diffractive lenses with addressable vertical-cavity laser arrays  

Science Conference Proceedings (OSTI)

An optical interconnection system is being developed to provide vertical, digital data channels for stacked multichip modules. A key component of the system is an array of individually addressable vertical-cavity surface-emitting lasers with diffractive lenses integrated into the substrate to control beam divergence and direction. The lenses were fabricated by direct-write e-beam lithography and reactive ion beam etching into the GaAs substrate. Preliminary device performance data and the design and fabrication issues are discussed.

Warren, M.E.; Du, T.C.; Wendt, J.R.; Vawter, G.A.; Carson, R.F.; Lear, K.L.; Kilcoyne, S.P.; Schneider, R.P.; Zolper, J.C.

1995-04-01T23:59:59.000Z

40

The Vertical Turn: Topographies of Metropolitan Modernism  

E-Print Network (OSTI)

Its Discontents: Essays on the New Mobility of People and214 Although this new vertical mobility was largely embracedhave produced new possibilities for mobility, simultaneity,

Haacke, Paul

2011-01-01T23:59:59.000Z

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


41

Conventional Energy Forum & Associated Vertical Business Development...  

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

The Office of Indian Energy Tribal Leader Energy Forum on "Conventional Energy (Oil, Gas, and Coal) Forum & Associated Vertical Business Development: Best Practices in Indian...

42

Formation flow channel blocking  

SciTech Connect

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

Kalina, A.I.

1982-11-30T23:59:59.000Z

43

Choice of a Vertical Grid in Incorporating Condensation Heating into an Isentropic Vertical Coordinate Model  

Science Conference Proceedings (OSTI)

Advantages of using an isentropic vertical coordinate in atmospheric models are well recognized. In particular, the use of an isentropic coordinate virtually eliminates discretization errors for vertical advection since isentropic surfaces are ...

Celal S. Konor; Akio Arakawa

2000-11-01T23:59:59.000Z

44

Vertical two chamber reaction furnace  

DOE Patents (OSTI)

A vertical two chamber reaction furnace is disclosed. The furnace comprises a lower chamber having an independently operable first heating means for heating the lower chamber and a gas inlet means for admitting a gas to create an ambient atmosphere, and an upper chamber disposed above the lower chamber and having an independently operable second heating means for heating the upper chamber. Disposed between the lower chamber and the upper chamber is a vapor permeable diffusion partition. The upper chamber has a conveyor means for conveying a reactant there through. Of particular importance is the thallinating of long-length thallium-barium-calcium copper oxide (TBCCO) or barium-calcium-copper oxide (BCCO) precursor tapes or wires conveyed through the upper chamber to thereby effectuate the deposition of vaporized thallium (being so vaporized as the first reactant in the lower chamber at a temperature between about 700 and 800 C) on TBCCO or BCCO tape or wire (the second reactant) at its simultaneous annealing temperature in the upper chamber of about 800 to 950 C to thereby replace thallium oxide lost from TBCCO tape or wire because of the high annealing temperature or to deposit thallium on BCCO tape or wire. Continuously moving the tape or wire provides a single-step process that effectuates production of long-length TBCCO superconducting product. 2 figs.

Blaugher, R.D.

1999-03-16T23:59:59.000Z

45

Vertical Contracts and Mandatory Universal Distribution  

E-Print Network (OSTI)

Vertical Contracts and Mandatory Universal Distribution Larry S. Karp Jeffrey M. Perloff July 2012 vendor. If a monopoly uses a single vendor, the government may impose a mandatory universal distribution consumer welfare. Keywords: vertical restrictions, mandatory universal distribution, new product oligopoly

Kammen, Daniel M.

46

ARM - Evaluation Product - Convective Vertical Velocity  

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

ProductsConvective Vertical Velocity ProductsConvective Vertical Velocity Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Evaluation Product : Convective Vertical Velocity 2011.04.25 - 2011.05.23 Site(s) SGP General Description Convective processes play an important role in Earth's energy balance by distributing heat and moisture throughout the atmosphere. In particular, vertical air motions associated with these processes are inherently linked to the life cycle of these convective systems and are therefore directly tied to their energy budget. However, direct measurements of vertical air motions (e.g., in situ aircraft observations) are sparse, making it difficult to compare them with numerical model output, which relies on convective parameterization schemes that have yet to be extensively

47

Vertical Flowmeter Test | Open Energy Information  

Open Energy Info (EERE)

Vertical Flowmeter Test Vertical Flowmeter Test Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Vertical Flowmeter Test Details Activities (0) Areas (0) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Downhole Techniques Exploration Sub Group: Well Testing Techniques Parent Exploration Technique: Well Testing Techniques Information Provided by Technique Lithology: Stratigraphic/Structural: Hydrological: Define permeable zones within a well Thermal: Dictionary.png Vertical Flowmeter Test: A well testing technique done upon completion of a well to identify locations of permeable zones within the well and to quantify the relative permeability of each zone. Other definitions:Wikipedia Reegle Introduction A vertical flowmeter test is also known as a spinner test and is preformed

48

Stability effects on the profiles of vertical velocity and its variance in katabatic flow  

DOE Green Energy (OSTI)

The atmospheric katabatic flow in the foothills of the Front Range of the Rocky Mountains has been monitored by a network of towers and sodars for several years as part of the Atmospheric Studies in Complex Terrain (ASCOT) program. The dependence of the vertical component of motion, its variance, and the mean component of the wind perpendicular to the surface at the mouth of Coal Creek Canyon on surface cooling and channeling by winds above the canyon has been explored by using almost three years of data from the network. The magnitude of the near-surface temperature differences was found to decrease with increasing surface cooling in light winds, apparently because of increasing turbulence resulting when increasing winds interact with surface topography. The variance of vertical velocity exhibits three types of vertical profiles, corresponding to different cooling rates and external wind speeds. The mean variance was found to depend strongly on a locally derived Richardson number.

Coulter, R.L.; Martin, T.J.

1994-10-01T23:59:59.000Z

49

Vertical feed stick wood fuel burning furnace system  

DOE Patents (OSTI)

A stove or furnace for efficient combustion of wood fuel includes a vertical feed combustion chamber (15) for receiving and supporting wood fuel in a vertical attitude or stack. A major upper portion of the combustion chamber column comprises a water jacket (14) for coupling to a source of water or heat transfer fluid for convection circulation of the fluid. The locus (31) of wood fuel combustion is thereby confined to the refractory base of the combustion chamber. A flue gas propagation delay channel (34) extending laterally from the base of the chamber affords delayed travel time in a high temperature refractory environment sufficient to assure substantially complete combustion of the gaseous products of wood burning with forced air prior to extraction of heat in heat exchanger (16). Induced draft draws the fuel gas and air mixture laterally through the combustion chamber and refractory high temperature zone to the heat exchanger and flue. Also included are active sources of forced air and induced draft, multiple circuit couplings for the recovered heat, and construction features in the refractory material substructure and metal component superstructure.

Hill, Richard C. (Orono, ME)

1982-01-01T23:59:59.000Z

50

Vertical Electrical Sounding Configurations | Open Energy Information  

Open Energy Info (EERE)

Vertical Electrical Sounding Configurations Vertical Electrical Sounding Configurations Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Vertical Electrical Sounding Configurations Details Activities (0) Areas (0) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Geophysical Techniques Exploration Sub Group: Electrical Techniques Parent Exploration Technique: Direct-Current Resistivity Survey Information Provided by Technique Lithology: Rock composition, mineral and clay content Stratigraphic/Structural: Detection of permeable pathways, fracture zones, faults Hydrological: Resistivity influenced by porosity, grain size distribution, permeability, fluid saturation, fluid type and phase state of the pore water Thermal: Resistivity influenced by temperature

51

Coexistence of Strategic Vertical Separation and Integration  

E-Print Network (OSTI)

This paper gives conditions under which vertical separation is chosen by some upstream firms, while vertical integration is chosen by others in the equilibrium of a symmetric model. A vertically separating firm trades off fixed contracting costs against the strategic benefit of writing a (two-part tariff, exclusive dealership) contract with its retailer. Equilibrium coexistence emerges when observable and non-renegotiable contracts are offered to downstream Cournot oligopolists that supply close substitutes. The scope for equilibrium coexistence diminishes when assumptions on contract observability and commitment are relaxed.

Jos Jansen; Jos Jansen; Coexistence Strategic; Vertical Separation; Jos Jansen

2003-01-01T23:59:59.000Z

52

Vertical Seismic Profiling | Open Energy Information  

Open Energy Info (EERE)

Vertical Seismic Profiling Vertical Seismic Profiling Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Vertical Seismic Profiling Details Activities (4) Areas (3) Regions (1) NEPA(0) Exploration Technique Information Exploration Group: Downhole Techniques Exploration Sub Group: Borehole Seismic Techniques Parent Exploration Technique: Borehole Seismic Techniques Information Provided by Technique Lithology: Rock unit density influences elastic wave velocities. Stratigraphic/Structural: Structural geology- faults, folds, grabens, horst blocks, sedimentary layering, discontinuities, etc. Hydrological: Combining compressional and shear wave results can indicate the presence of fluid saturation in the formation. Thermal: High temperatures and pressure impact the compressional and shear wave velocities.

53

Vertically stabilized elongated cross-section tokamak  

SciTech Connect

This invention provides a vertically stabilized, non-circular (minor) cross-section, toroidal plasma column characterized by an external separatrix. To this end, a specific poloidal coil means is added outside a toroidal plasma column containing an endless plasma current in a tokamak to produce a rectangular cross-section plasma column along the equilibrium axis of the plasma column. By elongating the spacing between the poloidal coil means the plasma cross-section is vertically elongated, while maintaining vertical stability, efficiently to increase the poloidal flux in linear proportion to the plasma cross-section height to achieve a much greater plasma volume than could be achieved with the heretofore known round cross-section plasma columns. Also, vertical stability is enhanced over an elliptical cross-section plasma column, and poloidal magnetic divertors are achieved.

Sheffield, George V. (Hopewell, NJ)

1977-01-01T23:59:59.000Z

54

Statistics on Vertical Wind Shear over Oceans  

Science Conference Proceedings (OSTI)

Statistics on boundary layer vertical wind shear were gathered from rawinsonde soundings taken from three small islands and one weather ship. These soundings show a high correlation between surface and 1829 m altitude wind directions. Wind speeds ...

Donald P. Wylie; Barry B. Hinton; Kellie M. Millett

1984-06-01T23:59:59.000Z

55

Relating River Plume Structure to Vertical Mixing  

Science Conference Proceedings (OSTI)

The structure of a river plume is related to the vertical mixing using an isohaline-based coordinate system. Salinity coordinates offer the advantage of translating with the plume as it moves or expanding as the plume grows. This coordinate ...

Robert D. Hetland

2005-09-01T23:59:59.000Z

56

Vertical Axis Wind Turbine Foundation parameter study  

DOE Green Energy (OSTI)

The dynamic failure criterion governing the dimensions of prototype Vertical Axis Wind Turbine Foundations is treated as a variable parameter. The resulting change in foundation dimensions and costs is examined.

Lodde, P.F.

1980-07-01T23:59:59.000Z

57

The Vertical Turn: Topographies of Metropolitan Modernism  

E-Print Network (OSTI)

superpower of the atomic age, these vertical structures andPan-Romanticism in the Atomic Age” before turning to myand the emergence of the atomic age. 228 Dos Passos, John.

Haacke, Paul

2011-01-01T23:59:59.000Z

58

Vertical Glider Robots for Subsea Equipment Delivery  

E-Print Network (OSTI)

We have developed an underwater vehicle that offers significant performance improvements over existing sub sea elevators. Our Vertical Glider Robot falls under its own weight to a precise location on the seafloor, employing ...

Reed, Brooks L.

2011-01-01T23:59:59.000Z

59

The Accuracy of Vertical Air Velocities from Doppler Radar Data  

Science Conference Proceedings (OSTI)

Eight methods of calculating vertical air velocity in a column are compared. Each method requires some or all of the following data: horizontal divergence, vertical precipitation velocity, hydrometeor terminal fall speed, and vertical air ...

Thomas Matejka; Diana L. Bartels

1998-01-01T23:59:59.000Z

60

Vertical Distribution of Contamination in Ground Water at the...  

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

Vertical Distribution of Contamination in Ground Water at the Tuba City, Arizona, Site Vertical Distribution of Contamination in Ground Water at the Tuba City, Arizona, Site...

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


61

Fractional channel multichannel analyzer  

DOE Patents (OSTI)

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.

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

1994-08-23T23:59:59.000Z

62

Radio Channel Simulator  

Radio Channel Simulator (RCSim) is a simulation package for making site-specific predictions of radio signal strength. The software computes received power atdiscrete grid points as a function of the transmitter location and propagation environment. ...

63

An Energy and Angular-Momentum Conserving Vertical Finite-Difference Scheme and Hybrid Vertical Coordinates  

Science Conference Proceedings (OSTI)

An energy and angular-momentum conserving vertical finite-difference scheme is introduced for a general terrain-following vertical coordinate which is a function of pressure and its surface value. A corresponding semi-implicit time scheme is also ...

A. J. Simmons; D. M. Burridge

1981-04-01T23:59:59.000Z

64

Definition: Vertical Electrical Sounding Configurations | Open Energy  

Open Energy Info (EERE)

Sounding Configurations Sounding Configurations Jump to: navigation, search Dictionary.png Vertical Electrical Sounding Configurations A vertical electrical sounding (VES) is a DC resistivity survey which provides information regarding the change in apparent resistivity with depth. A quantitative interpretation of the results from VES measurements enable determination of the parameters for the geoelectric section.[1] Also Known As VES; Schlumberger Sounding References ↑ http://www.nga.com/Flyers_PDF/NGA_DC_Resistivity.pdf http://www.amazon.com/Principles-Electric-Borehole-Geophysics-Geochemistry/dp/0444529942 Ret LikeLike UnlikeLike You like this.Sign Up to see what your friends like. rieved from "http://en.openei.org/w/index.php?title=Definition:Vertical_Electrical_Sounding_Configurations&oldid=596183

65

Fundamental and effective Yang-Mills vertices  

SciTech Connect

Calorons and plane waves within and in between them collectively give rise to a thermal ground state. The latter provides a homgeneous energy density and a negative pressure, and it induces quasiparticle masses to part of the propagating spectrum of deconfining SU(2) Yang-Mills thermodynamics (dynamical gauge-symmetry breaking). In the present talk we discuss the role of a single caloron in inducing effective local vertices, characterized by powers of h, mediating the interaction of plane waves which propagate over large distances. The constraints on momentum transfers through effective 4-vertices are revisited.

Hofmann, Ralf [ITP, Universitaet Heidelberg, Philosophenweg 16, 69120 Heidelberg (Germany)

2012-09-26T23:59:59.000Z

66

A low order model for vertical axis wind turbines  

E-Print Network (OSTI)

A new computational model for initial sizing and performance prediction of vertical axis wind turbines

Drela, Mark

67

Photon Channelling in Foams  

E-Print Network (OSTI)

Experiments by Gittings, Bandyopadhyay, and Durian [Europhys. Lett.\\ \\textbf{65}, 414 (2004)] demonstrate that light possesses a higher probability to propagate in the liquid phase of a foam due to total reflection. The authors term this observation photon channelling which we investigate in this article theoretically. We first derive a central relation in the work of Gitting {\\em et al.} without any free parameters. It links the photon's path-length fraction $f$ in the liquid phase to the liquid fraction $\\epsilon$. We then construct two-dimensional Voronoi foams, replace the cell edges by channels to represent the liquid films and simulate photon paths according to the laws of ray optics using transmission and reflection coefficients from Fresnel's formulas. In an exact honeycomb foam, the photons show superdiffusive behavior. It becomes diffusive as soon as disorder is introduced into the foams. The dependence of the diffusion constant on channel width and refractive index is explained by a one-dimensional random-walk model. It contains a photon channelling state that is crucial for the understanding of the numerical results. At the end, we shortly comment on the observation that photon channelling only occurs in a finite range of $\\epsilon$.

Michael Schmiedeberg; MirFaez Miri; Holger Stark

2005-05-17T23:59:59.000Z

68

Channel plate for DNA sequencing  

DOE Patents (OSTI)

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.

Douthart, Richard J. (Richland, WA); Crowell, Shannon L. (Eltopia, WA)

1998-01-01T23:59:59.000Z

69

Channel plate for DNA sequencing  

DOE Patents (OSTI)

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.

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

1998-01-13T23:59:59.000Z

70

Optimal Location of Vertical Wells: Decomposition Approach  

E-Print Network (OSTI)

Optimal Location of Vertical Wells: Decomposition Approach M. G. Ierapetritou and C. A. Floudas®elopment plan with well locations, gi®en a reser®oir property map and a set of infrastructure constraints, represents a ®ery challenging prob- lem. The problem of selecting the optimal ®ertical well locations

71

Vertical Structure of Dissipation in the Nearshore  

Science Conference Proceedings (OSTI)

The vertical structure of the dissipation of turbulence kinetic energy was observed in the nearshore region (3.2-m mean water depth) with a tripod of three acoustic Doppler current meters off a sandy ocean beach. Surface and bottom boundary layer ...

Falk Feddersen; J. H. Trowbridge; A. J. Williams III

2007-07-01T23:59:59.000Z

72

Hedging and Vertical Integration in Electricity Markets  

Science Conference Proceedings (OSTI)

This paper analyzes the interactions between competitive (wholesale) spot, retail, and forward markets and vertical integration in electricity markets. We develop an equilibrium model with producers, retailers, and traders to study and quantify the impact ... Keywords: asset pricing, corporate finance, electric--electronic, financial institutions, industries, markets

René Aïd; Gilles Chemla; Arnaud Porchet; Nizar Touzi

2011-08-01T23:59:59.000Z

73

Vertical pump with free floating check valve  

DOE Patents (OSTI)

A vertical pump with a bottom discharge having a free floating check valve isposed in the outlet plenum thereof. The free floating check valve comprises a spherical member with a hemispherical cage-like member attached thereto which is capable of allowing forward or reverse flow under appropriate conditions while preventing reverse flow under inappropriate conditions.

Lindsay, Malcolm (O' Hara Township, Allegheny County, PA)

1980-01-01T23:59:59.000Z

74

Gas heat transfer in a heated vertical channel under deteriorated turbulent heat transfer regime  

E-Print Network (OSTI)

Passive cooling via natural circulation of gas after a loss of coolant (LOCA) accident is one of the major goals of the Gas-cooled Fast Reactor (GFR). Due to its high surface heat flux and low coolant velocities under ...

Lee, Jeongik

2007-01-01T23:59:59.000Z

75

Gas Heat Transfer in a Heated Vertical Channel under Deteriorated Turbulent Heat Transfer Regime  

E-Print Network (OSTI)

Passive cooling via natural circulation of gas after a loss of coolant (LOCA) accident is one of the major goals of the Gas-cooled Fast Reactor (GFR). Due to its high surface heat flux and low coolant velocities under ...

Lee, Jeongik

76

Experimental Studies of Vertical Mixing in an Open Channel Raceway for Algae Biofuel Production.  

E-Print Network (OSTI)

?? Turbulent mixing plays an important role in the distribution of sunlight, carbon dioxide, and nutrients for algae in the raceway ponds. For large-scale raceway… (more)

Voleti, Ram Sudheer

2012-01-01T23:59:59.000Z

77

The vertical-mill stage : design of a vertical movement stage for surface machining  

E-Print Network (OSTI)

To allow the widespread use of three dimensional patterns on walls, the manufacturing cost must be reduced. The goal of this project is to design a machine for vertical axis movement which can be measured and controlled. ...

Herrera, Juan, Jr

2007-01-01T23:59:59.000Z

78

Channeling through Bent Crystals  

Science Conference Proceedings (OSTI)

Bent crystals have demonstrated potential for use in beam collimation. A process called channeling is when accelerated particle beams are trapped by the nuclear potentials in the atomic planes within a crystal lattice. If the crystal is bent then the particles can follow the bending angle of the crystal. There are several different effects that are observed when particles travel through a bent crystal including dechanneling, volume capture, volume reflection and channeling. With a crystal placed at the edge of a particle beam, part of the fringe of the beam can be deflected away towards a detector or beam dump, thus helping collimate the beam. There is currently FORTRAN code by Igor Yazynin that has been used to model the passage of particles through a bent crystal. Using this code, the effects mentioned were explored for beam energy that would be seen at the Facility for Advanced Accelerator Experimental Tests (FACET) at a range of crystal orientations with respect to the incoming beam. After propagating 5 meters in vacuum space past the crystal the channeled particles were observed to separate from most of the beam with some noise due to dechanneled particles. Progressively smaller bending radii, with corresponding shorter crystal lengths, were compared and it was seen that multiple scattering decreases with the length of the crystal therefore allowing for cleaner detection of the channeled particles. The input beam was then modified and only a portion of the beam sent through the crystal. With the majority of the beam not affected by the crystal, most particles were not deflected and after propagation the channeled particles were seen to be deflected approximately 5mm. After a portion of the beam travels through the crystal, the entire beam was then sent through a quadrupole magnet, which increased the separation of the channeled particles from the remainder of the beam to a distance of around 20mm. A different code, which was developed at SLAC, was used to create an angular profile plot which was compared to what was produced by Yazynin's code for a beam with no multiple scattering. The results were comparable, with volume reflection and channeling effects observed and the range of crystal orientations at which volume reflection is seen was about 1 mrad in both simulations.

Mack, Stephanie; /Ottawa U. /SLAC

2012-09-07T23:59:59.000Z

79

A new concept of vertically integrated pattern recognition associative memory  

SciTech Connect

Hardware-based pattern recognition for fast triggering on particle tracks has been successfully used in high-energy physics experiments for some time. The CDF Silicon Vertex Trigger (SVT) at the Fermilab Tevatron is an excellent example. The method used there, developed in the 1990's, is based on algorithms that use a massively parallel associative memory architecture to identify patterns efficiently at high speed. However, due to much higher occupancy and event rates at the LHC, and the fact that the LHC detectors have a much larger number of channels in their tracking detectors, there is an enormous challenge in implementing fast pattern recognition for a track trigger, requiring about three orders of magnitude more associative memory patterns than what was used in the original CDF SVT. Scaling of current technologies is unlikely to satisfy the scientific needs of the future, and investments in transformational new technologies need to be made. In this paper, we will discuss a new concept of using the emerging 3D vertical integration technology to significantly advance the state-of-the-art for fast pattern recognition within and outside HEP. A generic R and D proposal based on this new concept, with a few institutions involved, has recently been submitted to DOE with the goal to design and perform the ASIC engineering necessary to realize a prototype device. The progress of this R and D project will be reported in the future. Here we will only focus on the concept of this new approach.

Liu, Ted; Hoff, Jim; Deptuch, Grzegorz; Yarema, Ray; /Fermilab

2011-11-01T23:59:59.000Z

80

Fabrication of nano-structural arrays by channeling pulsed atomic beams through an intensity-modulated  

E-Print Network (OSTI)

Fabrication of nano-structural arrays by channeling pulsed atomic beams through an intensity-dimensional nano-structure arrays by passing a pulsed atomic beam through an intensity-modulated continuous of ``cooling'' along the longitudinal direction. This enables fabrication of vertically heterogeneous nano

Zhu, Xiangdong

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


81

Category:Vertical Electrical Sounding Configurations | Open Energy  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Category Edit History Facebook icon Twitter icon » Category:Vertical Electrical Sounding Configurations Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Geothermalpower.jpg Looking for the Vertical Electrical Sounding Configurations page? For detailed information on Vertical Electrical Sounding Configurations as exploration techniques, click here. Category:Vertical Electrical Sounding Configurations Add.png Add a new Vertical Electrical Sounding Configurations Technique Pages in category "Vertical Electrical Sounding Configurations" The following 2 pages are in this category, out of 2 total.

82

Dynamics of a vertical water bridge  

E-Print Network (OSTI)

A vertical connection of water is formed when a high voltage electrode is dipped in and pulled out of a container of deionized water. We considered the formation and dynamical characteristics of this vertical water bridge. For the first time in this field, instabilities were observed in the bridge that led to an oscillatory behaviour which we categorized them into three dynamical regimes. some explanations were supplied on the physics behind these dynamics. We report the formation of macroscopic droplets during our experiments, which their dynamics revealed that they are electrically charged. In some cases the droplets levitated in the air due to the equality of gravity and electrical force (acting in the opposite direction). Our results shed light on the physics behind this phenomenon and the horizontal water bridge, which explanations regarding its underlying physics have led to controversial theories and discussions before.

Reza Montazeri Namin; Zahra Karimi

2013-09-09T23:59:59.000Z

83

Definition: Vertical Seismic Profiling | Open Energy Information  

Open Energy Info (EERE)

Profiling Profiling Jump to: navigation, search Dictionary.png Vertical Seismic Profiling Vertical Seismic Profile (VSP) is a technique of seismic measurements used for high resolution seismic imaging. It can also be used for correlation with surface seismic data providing velocity information and information for processing such as deconvolution parameters. The defining characteristic of a VSP is that the detectors are in a borehole.[1][2][3] View on Wikipedia Wikipedia Definition Also Known As Advanced Borehole Seismology (ABS), Related Terms Seismic Techniques, High Resolution Imaging and Monitoring References ↑ Bob Hardage VSP Principles ↑ High resolution 3D seismic imaging using 3C data from large downhole seismic arrays Paulsson et al. (2004) ↑ Mueller Soroka Paulsson (2010)

84

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

DOE Patents (OSTI)

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.

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

1982-01-01T23:59:59.000Z

85

Characteristics of some submarine fan channels, Permian Ecca Group, South Africa  

Science Conference Proceedings (OSTI)

The vary well exposed submarine fan complex in the southwestern part of the Karoo basin permits close examination of channel-fills and in places their associated overbank deposits. The complex comprises five arenaceous fan systems some of which attain 60 m in thickness. The fans are vertically stacked and separated by basinal shale deposits; each system with its own direction of growth. The association of channelized sandstone bodies and thin-bedded sandstone and shale packages in an updip position from predominantly stacked lobe deposits suggest preservation of middle fan settings. A 500 m wide, 20 m thick channel-fill consisting massive amalgamated sandstone beds occupying the channel thalweg occurs in a setting dominated by thin-bedded, ripple-laminated sandstone and shale. Gradual thinning of the channel-fill beds toward the channel edges, lack of internal lateral accretion, and a high width to depth ratio suggests a low sinuous to straight channel. The channel-fill is capped by an abandonment facies characterized by ripple-laminated sandstone and shale. Stacked, laterally offset channel-fill deposits with highly erosional contacts and typical well-bedded overbank deposits form channel-overbank complexes and characterize the mid-fan region of the uppermost fan system. Palaeocurrent directions and gradual diminishing of bed-thickness away from the generally massively bedded, amalgamated channel-fill sandstones confirm a simultaneous channel/overbank origin for these deposits. Levee morphology has not been recognized. Both examples of channel-fills cited reveal part of the complexity of the channelized portions of submarine fans and hence the implications thereof in exploring for hydrocarbon reservoirs.

Bouma, A.H. (Louisiana State Univ., Baton Rouge (United States)); Dev Wickens, H. (Soekor, Parow (South Africa))

1991-03-01T23:59:59.000Z

86

Convective Cooling of Lightning Channels  

Science Conference Proceedings (OSTI)

We report experimental data which trace the time development of electric discharge channels in air and which demonstrate the turbulent cooling of such channels. These data provide qualitative confirmation of the model proposed and used by Hill, ...

J. M. Picone; J. P. Boris; J. R. Greig; M. Raleigh; R. F. Fernsler

1981-09-01T23:59:59.000Z

87

Impact of Dynamics and Atmospheric State on Cloud Vertical Overlap  

Science Conference Proceedings (OSTI)

The observation and representation in general circulation models (GCMs) of cloud vertical overlap are the objects of active research due to their impacts on the earth’s radiative budget. Previous studies have found that vertically contiguous ...

Catherine M. Naud; Anthony Del Genio; Gerald G. Mace; Sally Benson; Eugene E. Clothiaux; Pavlos Kollias

2008-04-01T23:59:59.000Z

88

Herrenknecht Vertical GmbH | Open Energy Information  

Open Energy Info (EERE)

Herrenknecht Vertical GmbH Herrenknecht Vertical GmbH Jump to: navigation, search Name Herrenknecht Vertical GmbH Place Schwanau, Baden-Württemberg, Germany Zip 77961 Sector Geothermal energy Product Specialized company that builds vertical drilling equipment for the development of geothermal resources. References Herrenknecht Vertical GmbH[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Herrenknecht Vertical GmbH is a company located in Schwanau, Baden-Württemberg, Germany . References ↑ "Herrenknecht Vertical GmbH" Retrieved from "http://en.openei.org/w/index.php?title=Herrenknecht_Vertical_GmbH&oldid=346498" Categories: Clean Energy Organizations Companies

89

On Deriving Vertical Air Motions from Cloud Radar Doppler Spectra  

Science Conference Proceedings (OSTI)

A method for deriving vertical air motions from cloud radar Doppler spectrum measurements is introduced. The method is applicable to cloud volumes containing small particles, in this case liquid droplets, which are assumed to trace vertical air ...

Matthew D. Shupe; Pavlos Kollias; Michael Poellot; Edwin Eloranta

2008-04-01T23:59:59.000Z

90

Numerical Modeling of the Atmosphere with an Isentropic Vertical Coordinate  

Science Conference Proceedings (OSTI)

In constructing a numerical model of the atmosphere, we must choose an appropriate vertical coordinate. Among the various possibilities, isentropic vertical coordinates such as the ?-coordinate seem to have the greatest potential, in spite of the ...

Yueh-Jiuan G. Hsu; Akio Arakawa

1990-10-01T23:59:59.000Z

91

Moisture Vertical Structure, Column Water Vapor, and Tropical Deep Convection  

Science Conference Proceedings (OSTI)

The vertical structure of the relationship between water vapor and precipitation is analyzed in 5 yr of radiosonde and precipitation gauge data from the Nauru Atmospheric Radiation Measurement (ARM) site. The first vertical principal component of ...

Christopher E. Holloway; J. David Neelin

2009-06-01T23:59:59.000Z

92

Vertical axis wind turbine with continuous blade angle adjustment  

E-Print Network (OSTI)

The author presents a concept for a vertical axis wind turbine that utilizes each blade's entire rotational cycle for power generation. Each blade has its own vertical axis of rotation and is constrained to rotate at the ...

Weiss, Samuel Bruce

2010-01-01T23:59:59.000Z

93

Movement and Vertical Coupling of Adiabatic Baroclinic Tropical Cyclones  

Science Conference Proceedings (OSTI)

The vertical coupling and movement of an adiabatic baroclinic tropical cyclone (TC) are investigated through two numerical experiments in which the TC is affected by either a vertical environmental shear or a differential beta drift. In both ...

Liguang Wu; Bin Wang

2001-07-01T23:59:59.000Z

94

Vertical Velocities in a Thunderstorm Gust Front and Outflow  

Science Conference Proceedings (OSTI)

Continuous vertically pointing measurements of a thunderstorm outflow, including its gust front, were obtained with a Doppler radar near New Salem, North Dakota. The measurements provide a high-resolution depiction of the vertical structure of ...

Brooks E. Martner

1997-05-01T23:59:59.000Z

95

Mean Vertical Motions Seen by Radar Wind Profilers  

Science Conference Proceedings (OSTI)

Radar wind profilers have been used to measure directly the vertical motion above the radar site. Mean values of vertical motions in the troposphere and lower stratosphere reported at sites in and near mountains are often several centimeters per ...

G. D. Nastrom; T. E. VanZandt

1994-08-01T23:59:59.000Z

96

Evaluation of Vertical Motion: Past, Present, and Future  

Science Conference Proceedings (OSTI)

The potential impact of gridded output from numerical models on operational forecasting of vertical motion is examined. A review of historical techniques for operational vertical motion evaluation is presented. An attempt is made to relate ...

Lawrence B. Dunn

1991-03-01T23:59:59.000Z

97

A Statistical Model of Vertical Shear from Moored Current Meters  

Science Conference Proceedings (OSTI)

We derive a statistical model or shear to predict how measurement of mean-square shear vary with stratification and with vertical separation ?z between moored current meters. Our model is based on a simplified version of the vertical wavenumber-...

David Rubenstein; Fred Newman; Walt Grabowski

1983-06-01T23:59:59.000Z

98

Environmental Vertical Wind Shear with Hurricane Bertha (1996)  

Science Conference Proceedings (OSTI)

Hurricane Bertha (1996) was influenced by vertical wind shear with highly variable direction and magnitude. The paper describes a unique method for determining the vertical tilt of a tropical cyclone vortex using satellite and aircraft data. ...

Raymond M. Zehr

2003-04-01T23:59:59.000Z

99

Vertical Structure of the Anomalous 2002 Antarctic Ozone Hole  

Science Conference Proceedings (OSTI)

Ozone estimates from observations by the NOAA-16 Solar Backscattered Ultraviolet (SBUV/2) instrument and Television Infrared Observation Satellite (TIROS-N) Operational Vertical Sounder (TOVS) are used to describe the vertical structure of ozone ...

S. Kondragunta; L. E. Flynn; A. Neuendorffer; A. J. Miller; C. Long; R. Nagatani; S. Zhou; T. Beck; E. Beach; R. McPeters; R. Stolarski; P. K. Bhartia; M. T. DeLand; L.-K. Huang

2005-03-01T23:59:59.000Z

100

Covert channels in IPv6  

Science Conference Proceedings (OSTI)

A covert channel is a communication path that allows transferring information in a way that violates a system security policy. Because of their concealed nature, detecting and preventing covert channels are obligatory security practices. In this paper, ... Keywords: IPsec, IPv6, active warden, covert channel, stateful, stateless

Norka B. Lucena; Grzegorz Lewandowski; Steve J. Chapin

2005-05-01T23:59:59.000Z

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


101

Particle swarm optimization applied to vertical traffic scheduling in buildings  

Science Conference Proceedings (OSTI)

Vertical traffic scheduling is significant in evaluating the quality of property management. An excellent vertical traffic scheduling approach aims at enhancing the system handling capacity and reducing the waiting time, journey time and energy consumption, ... Keywords: dynamic zoning, elevator group control system, particle swarm optimization, round-trip time, vertical traffic scheduling

Zhonghua Li; Hong-Zhou Tan; Yunong Zhang

2007-09-01T23:59:59.000Z

102

Joint Source-Channel Coding over a Fading Multiple Access Channel with Partial Channel State Information  

E-Print Network (OSTI)

In this paper we address the problem of transmission of correlated sources over a fast fading multiple access channel (MAC) with partial channel state information available at both the encoders and the decoder. We provide sufficient conditions for transmission with given distortions. Next these conditions are specialized to a Gaussian MAC (GMAC). We provide the optimal power allocation strategy and compare the strategy with various levels of channel state information. Keywords: Fading MAC, Power allocation, Partial channel state information, Correlated sources.

Rajesh, R

2009-01-01T23:59:59.000Z

103

Flow of fracturing foams in vertical, horizontal and inclined pipes  

E-Print Network (OSTI)

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 effects, liquid phase properties, and type and concentration of surfactant. The high solids carrying capacity, the minimum amount of fluid placed in the formation, and the excellent fluid recovery after treatment are some of the advantages that foam fluids present when used during fracturing operations. This thesis is a study of foam flow in pipes, the pressure calculations, the study of rheological properties and their evaluation. The objectives of this research are to: 1. Compare various rheological models representing foams. 2. Develop an algorithm that finds the rheological parameters for the different models at different pressures in the pipe. 3. Provide an engineer with a method that predicts pressure at one end, if pressure at the other end is known, given the rheological parameters of the fluid, the diameter of the pipe and the inlet stream properties. 4. Provide a spreadsheet program for different fluid models that calculates pressures in an inclined, vertical or horizontal pipe. 5. Validate the programs. General curve fitting techniques are used to fit different models: namely, power law, Bingham plastic and Herschel Bulkley models to shear stress vs. shear rate data. The trend of the power law and Bingham plastic rheological parameters with respect to quality is observed. A method to estimate the rheological parameters at different pressures along the pipe using regression methods is developed. Spreadsheet programs for power law Bingham plastic and volume equalized power law model have been developed, which calculate pressures in inclined, horizontal and vertical pipes. The methods for the power law and Bingham plastic fluids are iterative methods. The volume equalized power law program adopts the volume equalized principle, which uses mechanical energy balance with frictional losses calculated from a rheological model. The mechanical energy balance is integrated to obtain a non-linear equation containing the unknown pressure.

Krindinti, Kshipraprasad H

2002-01-01T23:59:59.000Z

104

Static virtual channel allocation in oblivious routing  

E-Print Network (OSTI)

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 ...

Shim, Keun Sup

105

Early Channel Evolution in the Middle Permian Brushy Canyon Formation, West Texas, USA  

E-Print Network (OSTI)

Submarine channels are important conduits for sediment in deep marine environments, and understanding their formation is critical to modeling basin fill processes. Most models describing channel evolution focus on turbidity currents as the erosive and constructive force in channel initiation. However, slope failure and slumping can be significant drivers of channelization, particularly in upper slope and ramp environments. Determining the relative roles of slumping and erosion by turbidity currents can provide important insight into the timing of channelization and the geometries of subsequent deposits. Samples were collected from Guadalupe Mountains National Park from two primary localities at Salt Flat Bench (Figure 2). Three vertical sections were measured at both locations. A total of 16 samples were collected for petrographic analysis and X-ray fluorescence (XRF) imaging. Spectacular outcrop quality makes the Middle Permian Brushy Canyon Formation in Guadalupe Mountains National Park an ideal location for the study of early channel evolution. A detailed facies analysis of fine-grained channel deposits was conducted in the Upper Brushy Canyon Formation in the Salt Flat Bench outcrops. After channelization, an interval of relative condensation dominated by hemipelagic settling of organic matter and silt was followed by an interval of incomplete sediment bypass by turbidity currents. This sequence of events suggests that sea level was at a relative highstand at the time of channel inception, whereas channel inception by turbidity currents is expected during a lowstand. Slumping rather than erosion by turbidity currents is the most likely mechanism to have initiated a channel at the study area. There is no evidence for the existence for high energy currents until after the interval of condensation. However, the action of weak contour currents during early channel evolution is observed in outcrop and microtextural features. Early carbonate cementation of channel-lining silts may have stabilized the slump surface with respect to erosion by later turbidity currents.

Gunderson, Spencer

2011-08-01T23:59:59.000Z

106

Control system for a vertical axis windmill  

DOE Patents (OSTI)

A vertical axis windmill having a rotating structure is provided with a series of articulated vertical blades whose positions are controlled to maintain a constant RPM for the rotating structure, when wind speed is sufficient. A microprocessor controller is used to process information on wind speed, wind direction and RPM of the rotating structure to develop an electrical signal for establishing blade position. The preferred embodiment of the invention, when connected to a utility grid, is designed to generate 40 kilowatts of power when exposed to a 20 mile per hour wind. The control system for the windmill includes electrical blade actuators that modulate the blades of the rotating structure. Blade modulation controls the blade angle of attack, which in turn controls the RPM of the rotor. In the preferred embodiment, the microprocessor controller provides the operation logic and control functions. A wind speed sensor provides inputs to start or stop the windmill, and a wind direction sensor is used to keep the blade flip region at 90.degree. and 270.degree. to the wind. The control system is designed to maintain constant rotor RPM when wind speed is between 10 and 40 miles per hour.

Brulle, Robert V. (St. Louis County, MO)

1983-10-18T23:59:59.000Z

107

Effective Higgs vertices in the generic MSSM  

Science Conference Proceedings (OSTI)

In this article we consider chirally enhanced corrections to Higgs vertices in the most general MSSM. We include the contributions stemming from bilinear terms, from the trilinear A terms, and from their nonholomorphic analogues, the A{sup '} terms, which couple squarks to the ''wrong'' Higgs field. We perform a consistent renormalization of the Higgs vertices beyond the decoupling limit (M{sub SUSY{yields}{infinity}}), using a purely diagrammatic approach. The cancellation of the different contributions in and beyond the decoupling limit is discussed and the possible size of decoupling effects which occur if the supersymmetry particles are not much heavier than the electroweak scale are examined. In the decoupling limit we recover the results obtained in the effective-field-theory approach. For the nonholomorphic A{sup '} terms we find the well known tan{beta} enhancement in the down sector similar to the one for terms proportional to {mu}. Because of the a priori generic flavor structure of these trilinear terms large flavor-changing neutral Higgs couplings can be induced. We also discover new tan{beta} enhanced contributions involving the usual holomorphic A terms, which were not discussed before in the literature. These corrections occur only if also flavor-diagonal nonholomorphic corrections to the Higgs couplings are present. This reflects the fact that the A terms, and also the chirality-changing self-energies, are physical quantities and cannot be absorbed into renormalization constants.

Crivellin, Andreas [Albert Einstein Center for Fundamental Physics, Institute for Theoretical Physics, University of Bern, CH-3012 Bern (Switzerland)

2011-03-01T23:59:59.000Z

108

Seismic Behaviour of Vertical Mass Isolated Structures  

SciTech Connect

In this paper, the seismic behaviour of vertical mass isolated structures against the earthquake is studied. These structures are assumed to be consisted of two subsystems. Mass subsystem possesses low lateral stiffness but carries the major part of mass of the system. Stiffness subsystem, however, controls the deformation of the mass subsystem and attributes with much higher stiffness. The isolator layer is, therefore, located in between the mass and the stiffness subsystems and assumed to be a viscous damper layer. The analytical model used for this investigation is a dual mass-spring model which is an extended form of the three element Maxwell model. In this study, the ability of mass isolation techniques in reducing earthquake effects on buildings with two approaches, parametric and numerical approaches, is shown. In the parametric approach, by definition an isolation factor for structure and determination the dynamic characteristics of system, the relative optimum value of the isolator damping coefficient is obtained. The results provide an insight on role of relative stiffness and mass ratio of the two subsystems. Finally, in the numerical approach, the spectral responses of these structures due to the earthquake are investigated. The results show a noticeable decrease in earthquake input force to vertical mass isolated structures in comparison with non-isolated structures.

Nekooei, M.; Ziyaeifar, M. [Structural Engineering Research Centre, International Institute of Earthquake Engineering and Seismology (IIEES), P.O. Box 19395-3913, Tehran (Iran, Islamic Republic of)

2008-07-08T23:59:59.000Z

109

Vertical axis wind turbine control strategy  

DOE Green Energy (OSTI)

Early expensive in automatic operation of the Sandia 17-m vertical axis research wind turbine (VAWT) has demonstrated the need for a systematic study of control algorithms. To this end, a computer model has been developed that uses actual wind time series and turbine performance data to calculate the power produced by the Sandia 17-m VAWT operating in automatic control. The model has been used to investigate the influence of starting algorithms on annual energy production. The results indicate that, depending on turbine and local wind characteristics, a bad choice of a control algorithm can significantly reduce overall energy production. The model can be used to select control algorithms and threshold parameters that maximize long-term energy production. An attempt has been made to generalize these results from local site and turbine characteristics to obtain general guidelines for control algorithm design.

McNerney, G.M.

1981-08-01T23:59:59.000Z

110

A New Hypothesis for the Vertical Distribution of Atmospheric Aerosols  

E-Print Network (OSTI)

A simple model which can explain the observed vertical distribution and size spectrum of atmospheric aerosol has been proposed. The model is based on a new physical hypothesis for the vertical mass exchange between the troposphere and the stratosphere. The vertical mass excange takes place through a gravity wave feedback mechanism. There is a close agreement between the model predicted aerosol distribution and size spectrum and the observed distributions.

A. Mary Selvam; A. S. Ramachandra Murty; Bh. V. Ramanamurty

1999-12-05T23:59:59.000Z

111

New Insights Into Deep Convective Core Vertical Velocities Using...  

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

Insights Into Deep Convective Core Vertical Velocities Using ARM UHF Wind Profilers For original submission and image(s), see ARM Research Highlights http:www.arm.govscience...

112

The Comparison between Vertical Shaft Furnace and Rotary Kiln for ...  

Science Conference Proceedings (OSTI)

Therefore, calcination of coke used for aluminum reduction by vertical shaft furnace is more competitive based on the existing quality of the green petroleum  ...

113

Vertical stratified turbulent transport mechanism indicated by remote sensing  

E-Print Network (OSTI)

Satellite and shipboard data reveal the intermittent vertical information transport mechanism of turbulence and internal waves that mixes the ocean, atmosphere, planets and stars.

Gibson, Carl H; Bondur, Valery G

2007-01-01T23:59:59.000Z

114

Vertical stratified turbulent transport mechanism indicated by remote sensing  

E-Print Network (OSTI)

Satellite and shipboard data reveal the intermittent vertical information transport mechanism of turbulence and internal waves that mixes the ocean, atmosphere, planets and stars.

Carl H. Gibson; R. Norris Keeler; Valery G. Bondur

2007-12-02T23:59:59.000Z

115

Commissioning of a Vertical Direct Chill Caster for Producti  

Science Conference Proceedings (OSTI)

Aug 1, 2003 ... Commissioning of a Vertical Direct Chill Caster for Producti by J. Grandfield, C-C. Young, K. Oswald, and P. Baker ...

116

Remote Sensing of Cirrus Particle Size Vertical Profile Using...  

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

and shapes. The vertical variation of ice crystal size can alter the radiative heatingcooling profiles in cirrus cloudy atmospheres and hence is an important component in the...

117

Lawrence Livermore study finds human activity affects vertical...  

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

human activity affects vertical structure of atmospheric temperature Anne M Stark, LLNL, (925) 422-9799, stark8@llnl.gov Human influences have directly impacted the latitude...

118

Assessing Cloud Spatial and Vertical Distribution with Infrared...  

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

Cloud Spatial and Vertical Distribution with Infrared Cloud Analyzer I. Genkova and C. N. Long Pacific Northwest National Laboratory Richland, Washington T. Besnard ATMOS SARL Le...

119

Comparison of Observed (HF Radar and ADCP Measurements) and Computed Tides in the North Channel of the Irish Sea  

Science Conference Proceedings (OSTI)

A three-dimensional high-resolution (grid of order 1 km) model of the North Channel of the Irish Sea, incorporating a one equation turbulence energy submodel to parameterize vertical mixing, is used to compute the M2, S2, N2, K1, and O1 tides. ...

Alan M. Davies; Philip Hall; M. John Howarth; Philip J. Knight; Rose J. Player

2001-07-01T23:59:59.000Z

120

SAFL Channel | Open Energy Information  

Open Energy Info (EERE)

SAFL Channel SAFL Channel Jump to: navigation, search Basic Specifications Facility Name SAFL Channel Overseeing Organization University of Minnesota Hydrodynamics Hydrodynamic Testing Facility Type Channel Length(m) 84.0 Beam(m) 2.8 Depth(m) 1.8 Cost(per day) Contact POC Towing Capabilities Towing Capabilities Yes Maximum Velocity(m/s) 6.1 Length of Effective Tow(m) 76.0 Wavemaking Capabilities Wavemaking Capabilities Yes Maximum Wave Height(m) 0.4 Maximum Wave Length(m) 6.6 Wave Period Range(s) 0.0 Current Velocity Range(m/s) 0.0 Programmable Wavemaking No Wavemaking Description Programmable control of wave making is currently in development and will be available in fall of 2009. Wave Direction Uni-Directional Simulated Beach Yes Description of Beach Channel is sufficiently adaptable to allow simulation of beach

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


121

Requirements for signaling channel authentication  

SciTech Connect

This contribution addresses requirements for ATM signaling channel authentication. Signaling channel authentication is an ATM security service that binds an ATM signaling message to its source. By creating this binding, the message recipient, and even a third party, can confidently verify that the message originated from its claimed source. This provides a useful mechanism to mitigate a number of threats. For example, a denial of service attack which attempts to tear-down an active connection by surreptitiously injecting RELEASE or DROP PARTY messages could be easily thwarted when authenticity assurances are in place for the signaling channel. Signaling channel authentication could also be used to provide the required auditing information for accurate billing which is impervious to repudiation. Finally, depending on the signaling channel authentication mechanism, end-to-end integrity of the message (or at least part of it) can be provided. None of these capabilities exist in the current specifications.

Tarman, T.D.

1995-12-11T23:59:59.000Z

122

Design of Sparse Filters for Channel Shortening  

Science Conference Proceedings (OSTI)

Channel shortening equalizers are used in acoustics to reduce reverberation, in error control decoding to reduce complexity, and in communication receivers to reduce inter-symbol interference. The cascade of a channel and channel shortening equalizer ... Keywords: Channel shortening, Discrete multi-tone modulation, Reverberant channels, Sparse filters, Time-domain equalizers

Aditya Chopra; Brian Lawrence Evans

2012-03-01T23:59:59.000Z

123

A Comparison of VHF Radar Vertical-Velocity Measurements by a Direct Vertical-Beam Method and by a VAD Technique  

Science Conference Proceedings (OSTI)

Vertical-velocity measurements made by a direct vertical-beam method are compared to vertical velocities derived from VAD (velocity-azimuth display) measurements over a 27-h period. The results indicate that the two types of measurements in ...

M. F. Larsen; S. Fukao; O. Aruga; M. D. Yamanaka; T. Tsuda; S. Kato

1991-12-01T23:59:59.000Z

124

Airfoil treatments for vertical axis wind turbines  

SciTech Connect

Sandia National Laboratories (SNL) has taken three airfoil related approaches to decreasing the cost of energy of vertical axis wind turbine (VAWT) systems; airfoil sections designed specifically for VAWTs, vortex generators (VGs), and ''pumped spoiling.'' SNL's blade element airfoil section design effort has led to three promising natural laminar flow (NLF) sections. One section is presently being run on the SNL 17-m turbine. Increases in peak efficiency and more desirable dynamic stall regulation characteristics have been observed. Vane-type VGs were fitted on one DOE/Alcoa 100 kW VAWT. With approximately 12% of span having VGs, annual energy production increased by 5%. Pumped spoiling utilizes the centrifugal pumping capabilities of hollow blades. With the addition of small perforations in the surface of the blades and valves controlled by windspeed at the ends of each blade, lift spoiling jets may be generated inducing premature stall and permitting lower capacity, lower cost drivetrain components. SNL has demonstrated this concept on its 5-m turbine and has wind tunnel tested perforation geometries on one NLF section.

Klimas, P.C.

1985-01-01T23:59:59.000Z

125

Condensation of refrigerants on vertical fluted tubes  

DOE Green Energy (OSTI)

Experiments were run to determine heat transfer performance of single vertical fluted tubes with selected fluids condensing on the outside. Working fluids included six fluorocarbons (Refrigerants 11, 21, 22, 113, 114, and 115) and a hydrocarbon (Refrigerant 600a or isobutane). The nine test tubes were of 2.54-cm (1-in.) nominal outside diameter and 1.2 m (4 ft) in length with from 0 (smooth) to 60 axial flutes. Condensing heat transfer coefficients ranged from 620 to 7900 W/m/sup 2/ . K (110 to 1400 Btu/hr . ft/sup 2/ . /sup 0/F) over the heat flux range of 2000 to 43,000 W/m/sup 2/ (920 to 13,600 Btu/hr . ft/sup 2/). All parameters are based on total condensing surface area. The data show that, for a given heat flux, a fluted tube can increase condensing coefficients up to 6.0 times smooth tube values. Further heat transfer enhancement was achieved by the use of drainage skirts on fluted tubes; these skirts effectively divided the 1.2-m (4-ft) tubes into two, four, and eight equal condensing lengths.

Combs, S.K.; Mailen, G.S.; Murphy, R.W.

1978-08-01T23:59:59.000Z

126

Engineering design of vertical test stand cryostat  

SciTech Connect

Under Indian Institutions and Fermilab collaboration, Raja Ramanna Centre for Advanced Technology and Fermi National Accelerator Laboratory are jointly developing 2K Vertical Test Stand (VTS) cryostats for testing SCRF cavities at 2K. The VTS cryostat has been designed for a large testing aperture of 86.36 cm for testing of 325 MHz Spoke resonators, 650 MHz and 1.3 GHz multi-cell SCRF cavities for Fermilab's Project-X. Units will be installed at Fermilab and RRCAT and used to test cavities for Project-X. A VTS cryostat comprises of liquid helium (LHe) vessel with internal magnetic shield, top insert plate equipped with cavity support stand and radiation shield, liquid nitrogen (LN{sub 2}) shield and vacuum vessel with external magnetic shield. The engineering design and analysis of VTS cryostat has been carried out using ASME B&PV Code and Finite Element Analysis. Design of internal and external magnetic shields was performed to limit the magnetic field inside LHe vessel at the cavity surface <1 {micro}T. Thermal analysis for LN{sub 2} shield has been performed to check the effectiveness of LN{sub 2} cooling and for compliance with ASME piping code allowable stresses.

Suhane, S.K.; Sharma, N.K.; Raghavendra, S.; Joshi, S.C.; Das, S.; Kush, P.K.; Sahni, V.C.; Gupta, P.D.; /Indore, Ctr. for Advanced Tech.; Sylvester, C.; Rabehl, R.; Ozelis, J.; /Fermilab

2011-03-01T23:59:59.000Z

127

Optimal Location of Vertical Wells: A Decomposition Approach  

E-Print Network (OSTI)

Optimal Location of Vertical Wells: A Decomposition Approach M.G. Ierapetritou and C.A. Floudas 1 correspondence should be addressed 1 #12; Abstract The generation of a reservoir development plan with well the optimal vertical well locations is formulated as a MILP problem where the binary variables correspond

128

Vertical Motion in the Gulf Stream Near 68°W  

Science Conference Proceedings (OSTI)

The authors compute and compare vertical motions from three different data sources within a 300-km square domain centered in the Gulf Stream near 38°N, 68°W, and show that vertical motions inferred from all three independent data sources and ...

Scott S. Lindstrom; D. Pandolph Watts

1994-11-01T23:59:59.000Z

129

Vertical Distribution of Bacterivorous Nematodes under Different Wenju Liang,1  

E-Print Network (OSTI)

Vertical Distribution of Bacterivorous Nematodes under Different Land Uses Wenju Liang,1 Xiaoke Zhang,1,3 Qi Li,1,3 Yong Jiang,1 Wei Ou,1,3 and Deborah A. Neher2 Abstract: The vertical distribution. In contrast, Chiloplacus and Prismatolaimus spp. were distributed down to 100-cm depth in the AC and CM

Neher, Deborah A.

130

Information geometry of Gaussian channels  

Science Conference Proceedings (OSTI)

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).

Monras, Alex [Dipartimento di Matematica e Informatica, Universita degli Studi di Salerno, Via Ponte don Melillo, I-84084 Fisciano (Italy); CNR-INFM Coherentia, Napoli (Italy); CNISM Unita di Salerno (Italy) and INFN Sezione di Napoli, Gruppo collegato di Salerno, Baronissi (Italy); Illuminati, Fabrizio [Dipartimento di Matematica e Informatica, Universita degli Studi di Salerno, Via Ponte don Melillo, I-84084 Fisciano (Italy); CNR-INFM Coherentia, Napoli (Italy) and CNISM Unita di Salerno; and INFN Sezione di Napoli, Gruppo collegato di Salerno, Baronissi (Italy); ISI Foundation for Scientific Interchange, Villa Gualino, Viale Settimio Severo 65, I-10133 Torino (Italy)

2010-06-15T23:59:59.000Z

131

Information geometry of Gaussian channels  

E-Print Network (OSTI)

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 from 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 byproduct, 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 formulae 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).

Alex Monras; Fabrizio Illuminati

2009-11-08T23:59:59.000Z

132

Banking channel management : global trends and strategies  

E-Print Network (OSTI)

Banking channel management has become a crucial component in the drive for improved efficiency. Since the channel is the interlocutor between customers and products, banks are leveraging their knowledge of channels to ...

Catalan, Renato Teixeira

2004-01-01T23:59:59.000Z

133

Performance analysis of relay channel estimation  

Science Conference Proceedings (OSTI)

Amplify-and-Forward (AF) relays can be used to enhance the channel in Multiple-Input-Multiple-Output (MIMO) wireless communication systems. However, optimizing the channel requires Channel State Information (CSI). This paper is concerned with the performance ...

Panagiota Lioliou; Mats Viberg; Mikael Coldrey

2009-11-01T23:59:59.000Z

134

ARM - Evaluation Product - Vertical Air Motion during Large-Scale  

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

ProductsVertical Air Motion during Large-Scale ProductsVertical Air Motion during Large-Scale Stratiform Rain Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Evaluation Product : Vertical Air Motion during Large-Scale Stratiform Rain Site(s) NIM SGP General Description The Vertical Air Motion during Large-Scale Stratiform Rain (VERVELSR) value-added product (VAP) uses the unique properties of a 95-GHz radar Doppler velocity spectra to produce vertical profiles of air motion during low-to-moderate (1-20 mm/hr) rainfall events It is designed to run at ARM sites that include a W-band ARM cloud radar (WACR) radar with spectra data processing. The VERVELSR VAP, based on the work of Giangrande et al. (2010), operates by exploiting a resonance effect that occurs in

135

Steerable vertical to horizontal energy transducer for mobile robots  

DOE Patents (OSTI)

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.

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

2001-01-01T23:59:59.000Z

136

Hydrodynamics of a vertical hydraulic fracture  

DOE Green Energy (OSTI)

We have developed a numerical algorithm, HUBBERT, to simulate the hydrodynamics of a propagating vertical, rectangular fracture in an elastic porous medium. Based on the IFD method, this algorithm assumes fracture geometry to be prescribed. The breakdown and the creation of the incipient fracture is carried out according to the Hubbert-Willis theory. The propagation of the fracture is based on the criterion provided by Griffith, based on energy considerations. The deformation properties of the open fracture are based on simple elasticity solutions. The fracture is assumed to have an elliptical shape to a distance equal to the fracture height, beyond which the shape is assumed to be parallel plate. A consequence of Griffith's criterion is that the fracture must propagate in discrete steps. The parametric studies carried out suggest that for a clear understanding of the hydrodynamics of the hydraulic fracture many hitherto unrecognized parameters must be better understood. Among these parameters one might mention, efficiency, aperture of the newly formed fracture, stiffness of the newly formed fracture, relation between fracture aperture and permeability, and well bore compliance. The results of the studies indicate that the patterns of pressure transients and the magnitudes of fracture length appear to conform to field observations. In particular, the discrete nature of fracture propagation as well as the relevant time scales of interest inferred from the present work seem to be corroborated by seismic monitoring in the field. The results suggest that the estimation of least principal stress can be reliably made either with shut in data or with reinjection data provided that injection rates are very small.

Narasimhan, T.N.

1987-03-24T23:59:59.000Z

137

Multipath Channels of Unbounded Capacity  

E-Print Network (OSTI)

The capacity of discrete-time, noncoherent, multipath fading channels is considered. It is shown that if the variances of the path gains decay faster than exponentially, then capacity is unbounded in the transmit power.

Koch, Tobias

2008-01-01T23:59:59.000Z

138

The quantum capacity with symmetric side channels  

E-Print Network (OSTI)

We present an upper bound for the quantum channel capacity that is both additive and convex. Our bound can be interpreted as the capacity of a channel for high-fidelity quantum communication when assisted by a family of channels that have no capacity on their own. This family of assistance channels, which we call symmetric side channels, consists of all channels mapping symmetrically to their output and environment. The bound seems to be quite tight, and for degradable quantum channels it coincides with the unassisted channel capacity. Using this symmetric side channel capacity, we find new upper bounds on the capacity of the depolarizing channel. We also briefly indicate an analogous notion for distilling entanglement using the same class of (one-way) channels, yielding one of the few entanglement measures that is monotonic under local operations with one-way classical communication (1-LOCC), but not under the more general class of local operations with classical communication (LOCC).

Graeme Smith; John A. Smolin; Andreas Winter

2006-07-05T23:59:59.000Z

139

Entanglement Cost of Quantum Channels  

E-Print Network (OSTI)

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.

Mario Berta; Fernando Brandao; Matthias Christandl; Stephanie Wehner

2011-08-26T23:59:59.000Z

140

Conventional Energy Forum & Associated Vertical Business Development: Best  

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

Conventional Energy Forum & Associated Vertical Business Conventional Energy Forum & Associated Vertical Business Development: Best Practices in Indian Country Conventional Energy Forum & Associated Vertical Business Development: Best Practices in Indian Country March 1, 2012 Las Vegas, Nevada Mandalay Bay Resort & Casino The Office of Indian Energy Tribal Leader Energy Forum on "Conventional Energy (Oil, Gas, and Coal) Forum & Associated Vertical Business Development: Best Practices in Indian Country" was held March 1, 2012, in Las Vegas, Nevada. The forum focused on recent trends, existing successful partnerships, and perspectives on the future of conventional energy and how tribal business interests are evolving to meet the interests and needs of new tribal energy economies. The forucm provided an opportunity for tribal

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


141

Vertical Pretreatment Reactor System (Poster), NREL (National Renewable Energy Laboratory)  

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

Vertical Pretreatment Reactor System Vertical Pretreatment Reactor System Two-vessel system for primary and secondary pretreatment at diff erent temperatures * Biomass is heated by steam injection to temperatures of 120°C to 210°C in the pressurized mixing tube * Preheated, premixed biomass is retained for specified residence time in vertical holding vessel; material continuously moves by gravity from top to bottom of reactor in plug-fl ow fashion * Residence time is adjusted by changing amount of material held in vertical vessel relative to continuous fl ow of material entering and exiting vessel * Optional additional reactor vessel allows for secondary pretreatment at lower temperatures-120°C to 180°C-with potential to add other chemical catalysts * First vessel can operate at residence

142

Vertical Velocity Structures in an Axisymmetric, Nonhydrostatic Tropical Cyclone Model  

Science Conference Proceedings (OSTI)

A statistical analysis of several experiments with different microphysical parameterizations in an axisymmetric, nonhydrostatic tropical cyclone model illustrates the impact of icc-phase microphysics on model vertical velocity structure. The ...

Stephen J. Lord; Jacqueline M. Lord

1988-05-01T23:59:59.000Z

143

Turbulent Vertical Kinetic Energy in the Ocean Mixed Layer  

Science Conference Proceedings (OSTI)

Vertical velocities in the ocean boundary layer were measured for two weeks at an open ocean, wintertime site using neutrally buoyant floats. Simultaneous measurements of the surface meteorology and surface waves showed a large variability in ...

Eric A. D'Asaro

2001-12-01T23:59:59.000Z

144

The Tropical Convective Spectrum. Part I: Archetypal Vertical Structures  

Science Conference Proceedings (OSTI)

A taxonomy of tropical convective and stratiform vertical structures is constructed through cluster analysis of 3 yr of Tropical Rainfall Measuring Mission (TRMM) “warm-season” (surface temperature greater than 10°C) precipitation radar (PR) ...

Dennis J. Boccippio; Walter A. Petersen; Daniel J. Cecil

2005-07-01T23:59:59.000Z

145

Effects of Vertical Wind Shear on Tropical Cyclone Precipitation  

Science Conference Proceedings (OSTI)

The response of the precipitation field for tropical cyclones in relation to the surrounding environmental vertical wind shear has been investigated using 20 000 snapshots of passive-microwave satellite rain rates. Composites of mean rain rates, ...

Matthew T. Wingo; Daniel J. Cecil

2010-03-01T23:59:59.000Z

146

The Vertical Structure of New England Coastal Fronts  

Science Conference Proceedings (OSTI)

Aircraft data from the New England Winter Storms Experiment (NEWSEX) are used to examine the vertical structure of four New England coastal fronts. The aircraft made multiple passes at varying elevations through the coastal fronts. The ...

John W. Nielsen; Peter P. Neilley

1990-09-01T23:59:59.000Z

147

Assessment of Vertically Integrated Liquid (VIL) Water Content Radar Measurement  

Science Conference Proceedings (OSTI)

Vertically integrated liquid (VIL) water content is a parameter obtained from a radar performing voluminal scanning. This parameter has proven useful in the detection of severe storms and may be a worthwhile indicator for very short-term rainfall ...

Brice Boudevillain; Hervé Andrieu

2003-06-01T23:59:59.000Z

148

Parameterization of Vertical Mixing in Numerical Models of Tropical Oceans  

Science Conference Proceedings (OSTI)

Measurements indicate that mixing processes are intense in the surface layers of the ocean but weak below the thermocline, except for the region below the core of the Equatorial Undercurrent where vertical temperature gradients are small and the ...

R. C. Pacanowski; S. G. H. Philander

1981-11-01T23:59:59.000Z

149

Reexamining the Vertical Development of Tornadic Vortex Signatures in Supercells  

Science Conference Proceedings (OSTI)

Observations from a hybrid phased-array Doppler radar, the Mobile Weather Radar, 2005 X-band, Phased-Array (MWR-05XP), were used to investigate the vertical development of tornadic vortex signatures (TVSs) during supercell tornadogenesis. Data ...

Michael M. French; Howard B. Bluestein; Ivan PopStefanija; Chad A. Baldi; Robert T. Bluth

150

A Vertical Wind Tunnel for Snow Process Studies  

Science Conference Proceedings (OSTI)

A vertical wind tunnel using an artificially generated supercooled cloud was constructed to study snowfall processes. It is 18 m high and operates to a temperature as low as ?25°C. Ultrasonic atomizers supply the supercooled water droplets, and ...

Tsuneya Takahashi; Chikara Inoue; Yoshinori Furukawa; Tatsuo Endoh; Renji Naruse

1986-03-01T23:59:59.000Z

151

Diagnosing Mesoscale Vertical Motion from Horizontal Velocity and Density Data  

Science Conference Proceedings (OSTI)

The mesoscale vertical velocity is obtained by solving a generalized omega equation (? equation) using density and horizontal velocity data from three consecutive quasi-synoptic high-resolution surveys in the Alboran Sea. The Atlantic Jet (AJ) ...

Enric Pallàs Sanz; Álvaro Viúdez

2005-10-01T23:59:59.000Z

152

What Controls the Vertical Extent of Continental Shallow Cumulus...  

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

what controls the vertical extent of shallow cumulus. Higher boundary-layer relative humidity is found on thick-cloud days, associated with large-scale moisture advection before...

153

Deduction of Vertical Motion in the Atmosphere from Aircraft Measurements  

Science Conference Proceedings (OSTI)

Equations for deducing the vertical motion of air based on aircraft measurements are presented along with derivations. The equations are based on the aircraft equations of motion, but due to different assumptions, the resulting equations are ...

Fred J. Kopp

1985-12-01T23:59:59.000Z

154

Stable Schemes for Nonlinear Vertical Diffusion in Atmospheric Circulation Models  

Science Conference Proceedings (OSTI)

The intensity of vertical mixing in atmospheric models generally depends on wind shear and static stability, making the diffusion process nonlinear. Traditional implicit numerical schemes, which treat the variables to be diffused implicitly but ...

Claude Girard; Yves Delage

1990-03-01T23:59:59.000Z

155

An ecological perceptual aid for precision vertical landings  

E-Print Network (OSTI)

Pilots of vertical landing vehicles face numerous control challenges which often involve the loss of outside visual perceptual cues or the control of flight parameters within tight constraints. These challenges are often ...

Smith, Cristin Anne

2006-01-01T23:59:59.000Z

156

Vertical Motions in Arctic Mixed-Phase Stratiform Clouds  

Science Conference Proceedings (OSTI)

The characteristics of Arctic mixed-phase stratiform clouds and their relation to vertical air motions are examined using ground-based observations during the Mixed-Phase Arctic Cloud Experiment (MPACE) in Barrow, Alaska, during fall 2004. The ...

Matthew D. Shupe; Pavlos Kollias; P. Ola G. Persson; Greg M. McFarquhar

2008-04-01T23:59:59.000Z

157

Observations of Vertical Wind Shear Heterogeneity in Convective Boundary Layers  

Science Conference Proceedings (OSTI)

Dual-Doppler wind syntheses from mobile radar observations obtained during the International H2O Project document some of the spatial variability of vertical wind profiles in convective boundary layers. Much of the variability of popular ...

Paul Markowski; Yvette Richardson

2007-03-01T23:59:59.000Z

158

Wirewalker: An Autonomous Wave-Powered Vertical Profiler  

Science Conference Proceedings (OSTI)

An inexpensive vertically profiling float that draws its energy from the ocean surface wavefield is described. Termed the “Wirewalker,” it is a generalized platform capable of supporting a variety of self-contained instruments. The motion of the ...

Luc Rainville; Robert Pinkel

2001-06-01T23:59:59.000Z

159

Varieties of Fully Resolved Spectra of Vertical Shear  

Science Conference Proceedings (OSTI)

The Multi-Scale profiler (MSP) resolves shear between vertical wavenumbers of 0.01 cpm and the viscous cutoff of small-scale turbulence. Observations from five sites reveal varied spectral shapes and amplitudes. Spectral amplitudes measured at ...

M. C. Gregg; D. P. Winkel; T. B. Sanford

1993-01-01T23:59:59.000Z

160

Solar Radiative Transfer in Clouds with Vertical Internal Inhomogeneity  

Science Conference Proceedings (OSTI)

To investigate the photon transport in inhomogeneous clouds, a Monte Carlo cloud model with internal variation of optical properties is developed. The data for cloud vertical internal inhomogeneity are chosen from published observations. ...

J. Li; D. J. W. Geldart; Petr Chýlek

1994-09-01T23:59:59.000Z

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


161

A Parameterization of Vertical Dispersion of Ground-Level Releases  

Science Conference Proceedings (OSTI)

The authors propose a simple parameterization for estimating vertical dispersion in the surface boundary layer. It improves upon methods proposed earlier (e.g., by van Ulden, Briggs, and Pasquill and Smith) in that it is based on simulation ...

Shuming Du; Akula Venkatram

1997-08-01T23:59:59.000Z

162

Vertical Resolution and Accuracy of Atmospheric Infrared Sounding Spectrometers  

Science Conference Proceedings (OSTI)

A theoretical analysis is performed to evaluate the accuracy and vertical resolution of atmospheric profiles obtained with the HIRS/2, GOES I/M, and HIS instruments. In addition, a linear simultaneous retrieval algorithm is used with aircraft ...

Hung-Lung Huang; William L. Smith; Harold M. Woolf

1992-03-01T23:59:59.000Z

163

Unusually Strong Vertical Motions in a Caribbean Hurricane  

Science Conference Proceedings (OSTI)

Unusually strong updrafts and downdrafts in the eyewall of Hurricane Emily (1987) during its rapidly deepening phase are documented by both in situ aircraft measurements and a vertically pointing Doppler radar. Updrafts and downdrafts as strong ...

Robert A. Black; Howard B. Bluestein; Michael L. Black

1994-12-01T23:59:59.000Z

164

The Vertical Partition of Oceanic Horizontal Kinetic Energy  

Science Conference Proceedings (OSTI)

To produce an interpretation of the surface kinetic energy as measured by altimeters, a survey is made of the vertical structure of kinetic energy profiles in a large number of globally distributed long current meter records. Although the data ...

Carl Wunsch

1997-08-01T23:59:59.000Z

165

Vertical Mode Initialization in a Limited Area Data Assimilation Experiment  

Science Conference Proceedings (OSTI)

A previously reported 9-day limited area data assimilation experiment has been reported, incorporating a recently developed nonlinear vertical mode initialization scheme. It is shown that the initialization scheme significantly reduces surfaces ...

G. A. Mills; J. L. McGregor

1983-10-01T23:59:59.000Z

166

Solitary Rossby Waves in the Presence of Vertical Shear  

Science Conference Proceedings (OSTI)

An investigation is made to determine the effects of vertical shear on regular neutral mode Rossby solitons for application to planetary atmospheres. The basic zonal flow consists of two fluid layers on a ?plane, each with different mean ...

P. D. Weidman; L. G. Redekopp

1980-10-01T23:59:59.000Z

167

Profiler Measurements of Vertical Velocity Fluctuations in the Ocean  

Science Conference Proceedings (OSTI)

A method is described for measuring the vertical component of velocity fluctuations due to three-dimensional turbulence in the ocean from a freely falling microstructure profiler. The dynamic pressure measurement relies on a commercially ...

J. N. Moum

1990-04-01T23:59:59.000Z

168

How Much Energy Propagates Vertically in the Equatorial Oceans?  

Science Conference Proceedings (OSTI)

Vertically propagating linear wave calculations using realistic equatorial buoyancy profiles are presented which show the percentage of the downward surface energy flux that reaches the deep equatorial oceans. The percentages vary widely ...

Peter R. Gent; James R. Luyten

1985-07-01T23:59:59.000Z

169

The Rapid-Sampling Vertical Profiler: An Evaluation  

Science Conference Proceedings (OSTI)

Evaluation of the Rapid-Sampling Vertical Profiler, which was developed for sampling the hydrophysical fields in the upper ocean from a moving vessel, shows that the instrument is useful for near-microscale measurements of temperature and ...

D. R. Caldwell; T. M. Dillon; J. N. Moum

1985-12-01T23:59:59.000Z

170

On Quantum Capacity of Compound Channels  

E-Print Network (OSTI)

In this paper we address the issue of universal or robust communication over quantum channels. Specifically, we consider memoryless communication scenario with channel uncertainty which is an analog of compound channel in classical information theory. We determine the quantum capacity of finite compound channels and arbitrary compound channels with informed decoder. Our approach in the finite case is based on the observation that perfect channel knowledge at the decoder does not increase the capacity of finite quantum compound channels. As a consequence we obtain coding theorem for finite quantum averaged channels, the simplest class of channels with long-term memory. The extension of these results to quantum compound channels with uninformed encoder and decoder, and infinitely many constituents remains an open problem.

I. Bjelakovic; H. Boche; J. Noetzel

2008-08-07T23:59:59.000Z

171

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

SciTech Connect

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.

Lites, B. W.; Kubo, M. [High Altitude Observatory, National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307 (United States); Berger, T.; Frank, Z.; Shine, R.; Tarbell, T.; Title, A. [Lockheed Martin Solar and Astrophysics Lab, 3251 Hanover Street, Organization ADBS, Building 252, Palo Alto, CA 94304 (United States); Okamoto, T. J. [National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 (Japan); Otsuji, K., E-mail: lites@ucar.ed [Department of Astronomy, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502 (Japan)

2010-07-20T23:59:59.000Z

172

Generation Maintenance Applications Center: Conventional Vertical Pump Maintenance Guide  

Science Conference Proceedings (OSTI)

Vertical pumps are used in several applications in power plants, such as condensate, heater drain, circulating water, and service water/river water applications.BackgroundThe Maintenance Issue Surveys of the Electric Power Research Institute (EPRI) Generation Maintenance Applications Center (GenMAC) indicate that members are experiencing difficulties with various maintenance issues associated with vertical pumps. Some of the problems identified a need for ...

2013-12-19T23:59:59.000Z

173

Alignment and operability analysis of a vertical sodium pump  

SciTech Connect

With the objective of identifying important alignment features of pumps such as FFTF, HALLAM, EBR II, PNC, PHENIX, and CRBR, alignment of the vertical sodium pump for the Clinch River Breeder Reactor Plant (CRBRP) is investigated. The CRBRP pump includes a flexibly coupled pump shaft and motor shaft, two oil-film tilting-pad hydrodynamic radial bearings in the motor plus a vertical thrust bearing, and two sodium hydrostatic bearings straddling the double-suction centrifugal impeller in the pump.

Gupta, V.K.; Fair, C.E.

1981-01-01T23:59:59.000Z

174

Poolside Measurement of AREVA BWR Fuel Channels  

Science Conference Proceedings (OSTI)

As part of the EPRI Fuel Reliability Program, a fuel channel focus group formed in 2002 to initiate measurements on irradiated boiling water reactor (BWR) fuel channels. Fuel channels designed and supplied by Framatome ANP, Inc., an AREVA and Siemens Company (AREVA), were of particular interest, since no measurement information existed from U.S. BWRs with modern AREVA channels. The efforts of the focus group culminated in development of a new channel measurement machine by AREVA and the measurement of AR...

2004-12-13T23:59:59.000Z

175

A Comparison of Techniques to Estimate Vertical Air Motions and Raindrop Size Distributions  

Science Conference Proceedings (OSTI)

Doppler velocity spectra collected at vertical incidence contain information on vertical air motions and drop-size distributions with high spatial and temporal resolution. In the past, the computational interdependence between vertical air ...

Karen L. Sangren; Peter S. Ray; Gene B. Walker

1984-06-01T23:59:59.000Z

176

Ceramic membranes having macroscopic channels  

DOE Patents (OSTI)

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.

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

1996-01-01T23:59:59.000Z

177

Ceramic membranes having macroscopic channels  

DOE Patents (OSTI)

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. 1 fig.

Anderson, M.A.; Peterson, R.A.

1996-09-03T23:59:59.000Z

178

The External Scale of Clear Air Turbulence Derived from the Vertical Ozone Profile: Application to Vertical Transport Measurement  

Science Conference Proceedings (OSTI)

Using a high-resolution stratospheric ozonometer it has been possible to obtain vertical ozone profiles in which microfluctuations may be interpreted as the consequence of eddy diffusion. Applying Kolmogoroff's theory to the signal, one can ...

J. Barat; P. Aimedieu

1981-03-01T23:59:59.000Z

179

Vertical Velocity and Vertical Heat Flux Observed within Loop Current Eddies in the Central Gulf of Mexico  

Science Conference Proceedings (OSTI)

Sixteen months of observations from a surface-to-bottom mooring in the central Gulf of Mexico show that acoustic Doppler current profilers (ADCPs) are useful for directly measuring the vertical velocity within mesoscale anticyclonic eddies, such ...

David Rivas; Antoine Badan; Julio Sheinbaum; José Ochoa; Julio Candela

2008-11-01T23:59:59.000Z

180

The Vertical Ball Mill for the Grinding of Calcined Petroleum Coke to ...  

Science Conference Proceedings (OSTI)

A new vertical ball ring mill concept has been developed based on the results of research on the grinding of calcined petroleum coke. Industrial vertical mills are ...

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


181

DUCTED FAN INLET/EXIT AND ROTOR TIP FLOWIMPROVEMENTS FOR VERTICAL LIFT SYSTEMS.  

E-Print Network (OSTI)

??Ducted fan based vertical lift systems are excellent candidates to be in the group of the next generation vertical lift vehicles, with many potential applications… (more)

Akturk, Ali

2010-01-01T23:59:59.000Z

182

Eleven-channel second-order silicon microring-resonator filterbank with tunable channel spacing  

E-Print Network (OSTI)

A wide-band, eleven-channel second-order filterbank fabricated on an SOI platform is demonstrated with tunable channel spacing and a 20 GHz single-channel bandwidth. The tuning efficiency is ~28 ?W/GHz/ring.

Dahlem, Marcus Vinicius Sobral

183

FPGA side-channel receivers  

Science Conference Proceedings (OSTI)

The popularity of FPGAs is rapidly growing due to the unique advantages that they offer. However, their distinctive features also raise new questions concerning the security and communication capabilities of an FPGA-based hardware platform. In this paper, ... Keywords: ddr2, fpga, i2c, phase shift, side-channel receiver, thermal

Ji Sun; Ray Bittner; Ken Eguro

2011-02-01T23:59:59.000Z

184

Shallow Water Flows in Channels  

Science Conference Proceedings (OSTI)

We consider the shallow water equations for flows through channels with arbitrary cross section. The system forms a hyperbolic set of balance laws. Exact steady-state solutions are available and are controlled by the relation between the bottom topography ... Keywords: Balance laws, Hyperbolic conservation laws, Steady-state solutions, Upwind schemes

Gerardo Hernández-Dueñas; Smadar Karni

2011-07-01T23:59:59.000Z

185

Quantum Capacities of Channels with small Environment  

E-Print Network (OSTI)

We investigate the quantum capacity of noisy quantum channels which can be represented by coupling a system to an effectively small environment. A capacity formula is derived for all cases where both system and environment are two-dimensional--including all extremal qubit channels. Similarly, for channels acting on higher dimensional systems we show that the capacity can be determined if the channel arises from a sufficiently small coupling to a qubit environment. Extensions to instances of channels with larger environment are provided and it is shown that bounds on the capacity with unconstrained environment can be obtained from decompositions into channels with small environment.

Michael M. Wolf; David Perez-Garcia

2006-07-11T23:59:59.000Z

186

Ion transport through cell membrane channels  

E-Print Network (OSTI)

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

Jan Gomulkiewicz; Jacek Miekisz; Stanislaw Miekisz

2007-06-05T23:59:59.000Z

187

The Influence of Wind Direction upon Flow along the West Coast of Britain and in the North Channel of the Irish Sea  

Science Conference Proceedings (OSTI)

This paper briefly describes the development of a three-dimensional nonlinear hydrodynamic model of the sea region off the west coast of Scotland, the North Channel, and the Irish Sea. The model uses a sigma coordinate in the vertical, and ...

Alan M. Davies; Jiuxing Xing

2003-01-01T23:59:59.000Z

188

STRAT: An Automated Algorithm to Retrieve the Vertical Structure of the Atmosphere from Single-Channel Lidar Data  

Science Conference Proceedings (OSTI)

Today several lidar networks around the world provide large datasets that are extremely valuable for aerosol and cloud research. Retrieval of atmospheric constituent properties from lidar profiles requires detailed analysis of spatial and ...

Y. Morille; M. Haeffelin; P. Drobinski; J. Pelon

2007-05-01T23:59:59.000Z

189

Determination of vertical profiles of aerosol extinction, single scatter  

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

Determination of vertical profiles of aerosol extinction, single scatter Determination of vertical profiles of aerosol extinction, single scatter albedo and asymmetry parameter at Barrow. Sivaraman, Chitra Pacific Northwest National Laboratory Flynn, Connor Pacific Northwest National Laboratory Turner, David University of Wisconsin-Madison Category: Aerosols Efforts are currently underway to run and evaluate the Broadband Heating Rate Profile project at the ARM North Slope of Alaska (NSA) Barrow site for the time period March 2004 - February 2005. The Aerosol Best-Estimate (ABE) Value-Added Procedure (VAP) is to provide continuous estimates of vertical profiles of aerosol extinction, single-scatter albedo, and asymmetry parameter above the Northern Slopes of Alaska (NSA) facility. In the interest of temporal continuity, we have developed an algorithm that

190

Feedback Capacity of the Compound Channel  

E-Print Network (OSTI)

In this work, we find the capacity of a compound finite-state channel (FSC) with time-invariant deterministic feedback. We consider the use of fixed length block codes over the compound channel. Our achievability result ...

Shrader, Brooke E.

191

Vertical Transition in Transport and Mixing in Baroclinic Flows  

Science Conference Proceedings (OSTI)

Numerical simulations in multilevel baroclinic turbulence in a ?-plane channel model are discussed, focusing on the transport and mixing behavior. The temperature field in the model is relaxed toward a field consistent with a broad zonal jet with ...

M. D. Greenslade; P. H. Haynes

2008-04-01T23:59:59.000Z

192

NIST Launches YouTube Channel  

Science Conference Proceedings (OSTI)

... The Department of Commerce negotiated a contract with Google that allows its agencies to establish YouTube channels. ...

2011-04-06T23:59:59.000Z

193

Optimal superdense coding over memory channels  

SciTech Connect

We study the superdense coding capacity in the presence of quantum channels with correlated noise. We investigate both the cases of unitary and nonunitary encoding. Pauli channels for arbitrary dimensions are treated explicitly. The superdense coding capacity for some special channels and resource states is derived for unitary encoding. We also provide an example of a memory channel where nonunitary encoding leads to an improvement in the superdense coding capacity.

Shadman, Z.; Kampermann, H.; Bruss, D.; Macchiavello, C. [Institute fuer Theoretische Physik III, Heinrich-Heine-Universitaet Duesseldorf, DE-40225 Duesseldorf (Germany); Dipartimento di Fisica ''A. Volta'' and INFM-Unita di Pavia, Via Bassi 6, IT-27100 Pavia (Italy)

2011-10-15T23:59:59.000Z

194

Shannon capacity of nonlinear regenerative channels  

E-Print Network (OSTI)

We compute Shannon capacity of nonlinear channels with regenerative elements. Conditions are found under which capacity of such nonlinear channels is higher than the Shannon capacity of the classical linear additive white Gaussian noise channel. We develop a general scheme for designing the proposed channels and apply it to the particular nonlinear sine-mapping. The upper bound for regeneration efficiency is found and the asymptotic behavior of the capacity in the saturation regime is derived.

Sorokina, M A

2013-01-01T23:59:59.000Z

195

IntroductionIntroduction The use of small scale vertical axis wind turbinesThe use of small scale vertical axis wind turbines  

E-Print Network (OSTI)

IntroductionIntroduction The use of small scale vertical axis wind turbinesThe use of small scale vertical axis wind turbines (VAWT) is being studied at McMaster University using(VAWT) is being studied

Tullis, Stephen

196

On the Initial Development of Asymmetric Vertical Motion and Horizontal Relative Flow in a Mature Tropical Cyclone Embedded in Environmental Vertical Shear  

Science Conference Proceedings (OSTI)

In this paper, we focus on the initial development of asymmetric vertical motion and horizontal relative flow in a mature tropical cyclone (TC) embedded in an environmental vertical shear. The fully compressible, non-hydrostatic TC model was used ...

Yamei Xu; Yuqing Wang

197

On the Vertical Distribution of Mean Vertical Velocities in the Convective Regions during the Wet and Dry Spells of the Monsoon over Gadanki  

Science Conference Proceedings (OSTI)

The Indian Mesosphere–Stratosphere–Troposphere (MST) radar observations of vertical distribution of mean vertical velocities w in convective regions during the wet and dry spells of the Indian summer monsoon over a tropical station at Gadanki, ...

K. N. Uma; K. Kishore Kumar; Siddarth Shankar Das; T. N. Rao; T. M. Satyanarayana

2012-02-01T23:59:59.000Z

198

Toward a Framework for Assessing Internet Channels  

Science Conference Proceedings (OSTI)

The emergence of the Internet has forced a large number of firms to introduce Internet-based channels of distribution into existing distribution systems to market their products. In multiple channels context, there has been a call for better performance ... Keywords: Internet channels, strategic profit model (SPM), analytic network process (ANP), performance evaluation

Hung-Jen Tu; Chia-Yang Wong

2010-05-01T23:59:59.000Z

199

Information transmission through lossy bosonic memory channels  

E-Print Network (OSTI)

We study the information transmission through a quantum channel, defined over a continuous alphabet and losing its energy en route, in presence of correlated noise among different channel uses. We then show that entangled inputs improve the rate of transmission of such a channel.

Giovanna Ruggeri; Giulio Soliani; Vittorio Giovannetti; Stefano Mancini

2005-02-15T23:59:59.000Z

200

A Dynamic Model of the Indoor Channel  

Science Conference Proceedings (OSTI)

This paper proposes a new approach to modeling the radio channel experienced by transceivers moving in an indoor environment. For modeling the time-varying impulse response (IR) a randomly time-varying power-delay profile (PDP) is used, which ... Keywords: channel measurements, indoor channel modeling, ray clustering, time-varying PDP, wide band model

Jesper Ødum Nielsen; Valentine Afanassiev; Jørgen Bach Andersen

2001-11-01T23:59:59.000Z

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


201

Multiple channel data acquisition system  

DOE Patents (OSTI)

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.

Crawley, H. Bert (Ames, IA); Rosenberg, Eli I. (Ames, IA); Meyer, W. Thomas (Ames, IA); Gorbics, Mark S. (Ames, IA); Thomas, William D. (Boone, IA); McKay, Roy L. (Ames, IA); Homer, Jr., John F. (Ames, IA)

1990-05-22T23:59:59.000Z

202

Multiple channel data acquisition system  

DOE Patents (OSTI)

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.

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

1990-05-22T23:59:59.000Z

203

A COMPARISON OF LIDAR GENERATED CHANNEL FEATURES WITH GROUND-SURVEYED CHANNEL FEATURES IN THE LITTLE CREEK WATERSHED.  

E-Print Network (OSTI)

??Detecting change in stream channel features over time is important in understanding channel morphology and the effects of both natural and anthropogenic influences. Channel features… (more)

Hilburn, Ryan M

2010-01-01T23:59:59.000Z

204

Development of Vertically Integrated Circuits for ILC Vertex Detectors  

E-Print Network (OSTI)

We report on studies of vertically interconnected electronics (3D) performed by the Fermilab pixel group over the past two years. These studies include exploration of interconnect technology, backside thinning and laser annealing, the production of the first 3D chip for particle physics, the VIP, and plans for a commercial two-tier 3D fabrication run.

Ronald Lipton; for the Fermilab Pixel R&D Group

2009-01-29T23:59:59.000Z

205

Development of Vertically Integrated Circuits for ILC Vertex Detectors  

E-Print Network (OSTI)

We report on studies of vertically interconnected electronics (3D) performed by the Fermilab pixel group over the past two years. These studies include exploration of interconnect technology, backside thinning and laser annealing, the production of the first 3D chip for particle physics, the VIP, and plans for a commercial two-tier 3D fabrication run.

Lipton, Ronald

2009-01-01T23:59:59.000Z

206

Seeding Tests on Supercooled Stratus Using Vertical Fall Pyrotechnics  

Science Conference Proceedings (OSTI)

In Michigan in early 1977, an experiment was conducted to test the ability of silver iodide (AgI) ice nucleus curtains generated by vertical-fall pyrotechnics to produce clearings in supercooled stratus. A second objective of the experiment was ...

Joe L. Sutherland; John R. Thompson; Don A. Griffith; Bruce Kunkel

1982-02-01T23:59:59.000Z

207

Vertically Integrated Budgets of Mass and Energy for the Globe  

Science Conference Proceedings (OSTI)

Large-scale vertically integrated fluxes of mass and energy for the global atmosphere are calculated and displayed from FGGE III-b data. Until recently the global nature of these basic climatological terms could not be obtained because of lack of ...

G. J. Boer; Neil E. Sargent

1985-08-01T23:59:59.000Z

208

Analysis and correction of vertical dispersion in RHIC  

SciTech Connect

In the context of preserving the polarization of proton beams, the source of vertical dispersion in RHIC is analyzed. Contributions to dispersion from non-coupling sources and coupling sources are compared. Based on the analysis of sources for dispersion, the right actuator for correcting dispersion is determined and a corresponding algorithm is developed.

Liu, C.; Minty, M.

2011-09-14T23:59:59.000Z

209

Vertical Wind Shear Associated with Left-Moving Supercells  

Science Conference Proceedings (OSTI)

Vertical wind shear parameters are presented for 60 left-moving supercells across the United States, 53 of which produced severe hail (?1.9 cm). Hodographs corresponding to environments of left-moving supercells have a tendency to be more linear ...

Matthew J. Bunkers

2002-08-01T23:59:59.000Z

210

Cryogenic vertical test facility for the SRF cavities at BNL  

SciTech Connect

A vertical test facility has been constructed to test SRF cavities and can be utilized for other applications. The liquid helium volume for the large vertical dewar is approximate 2.1m tall by 1m diameter with a clearance inner diameter of 0.95m after the inner cold magnetic shield installed. For radiation enclosure, the test dewar is located inside a concrete block structure. The structure is above ground, accessible from the top, and equipped with a retractable concrete roof. A second radiation concrete facility, with ground level access via a labyrinth, is also available for testing smaller cavities in 2 smaller dewars. The cryogenic transfer lines installation between the large vertical test dewar and the cryo plant's sub components is currently near completion. Controls and instrumentations wiring are also nearing completion. The Vertical Test Facility will allow onsite testing of SRF cavities with a maximum overall envelope of 0.9 m diameter and 2.1 m height in the large dewar and smaller SRF cavities and assemblies with a maximum overall envelope of 0.66 m diameter and 1.6 m height.

Than, R.; Liaw, CJ; Porqueddu, R.; Grau, M.; Tuozzolo, J.; Tallerico, T.; McIntyre, G.; Lederle, D.; Ben-Zvi, I.; Burrill, A.; Pate, D.

2011-03-28T23:59:59.000Z

211

Diurnal Variation of Pressure-Heights: A Vertical Phase Shift  

Science Conference Proceedings (OSTI)

A vertical phase shift of the diurnal harmonic of geopotential height S1(Z) in the lower troposphere of low latitudes is shown by a comparison of diurnal harmonic of surface pressure at two surface stations that have an elevation difference close ...

Tsing-Chang Chen; Ming-Cheng Yen; Siegfried Schubert

2001-09-01T23:59:59.000Z

212

Scaling Hard Vertical Surfaces with Compliant Microspine Arrays  

Science Conference Proceedings (OSTI)

A new approach for climbing hard vertical surfaces has been developed that allows a robot to scale concrete, stucco, brick and masonry walls without using suction or adhesives.The approach is inspired by the mechanisms observed in some climbing insects ... Keywords: bio-inspired, climbing, legged locomation, spines

Alan T. Asbeck; Sangbae Kim; M. R. Cutkosky; William R. Provancher; Michele Lanzetta

2006-12-01T23:59:59.000Z

213

Optimal dynamic vertical ray shooting in rectilinear planar subdivisions  

Science Conference Proceedings (OSTI)

In this paper we consider the dynamic vertical ray shooting problem, that is the task of maintaining a dynamic set S of n non intersecting horizontal line segments in the plane subject to a query that reports the first segment in S ...

Yoav Giyora; Haim Kaplan

2007-01-01T23:59:59.000Z

214

On the Vertical Structure of Wind-Driven Sea Currents  

Science Conference Proceedings (OSTI)

The vertical structure of wind-driven sea surface currents and the role of wind-wave breaking in its formation are investigated by means of both field experiments and modeling. Analysis of drifter measurements of surface currents in the uppermost ...

Vladimir Kudryavtsev; Victor Shrira; Vladimir Dulov; Vladimir Malinovsky

2008-10-01T23:59:59.000Z

215

Vertical Heat-Flux Measurements from a Neutrally Buoyant Float  

Science Conference Proceedings (OSTI)

A neutrally buoyant float instrumented to measure 1–5 m shear and stratification was deployed for ten days in a near-inertial critical layer at the base of a warm-core ring. Vertical velocity and temperature data, from which large-scale (>5 m) ...

Haili Sun; Eric Kunze; A. J. Williams III

1996-06-01T23:59:59.000Z

216

The Free Kelvin Wave with Lateral and Vertical Viscosity  

Science Conference Proceedings (OSTI)

Free Kelvin wave solutions of the linear shallow-water equations are described, for an f-plane. Lateral and vertical viscous effects are represented by terms ?2u and du, respectively, where (u,v) is the (onshore, longshore) velocity. Both no-...

Michael K. Davey; William W. Hsieh; Roxana C. Wajsowicz

1983-12-01T23:59:59.000Z

217

A Lightweight NO2 Instrument for Vertical Height Profiles  

Science Conference Proceedings (OSTI)

A new lightweight NO2 instrument that can be flown from a tethered balloon to give vertical NO2 profiles is described. The detection principle is the chemiluminescent reaction between NO2 and a solution of luminol. The instrument is integrated ...

J. T. Pisano; J. W. Drummond; D. R. Hastie

1996-04-01T23:59:59.000Z

218

A Vertically Averaged Circulation Model Using Boundary-Fitted Coordinates  

Science Conference Proceedings (OSTI)

A two-dimensional vertically averaged circulation model using boundary-fitted coordinates has been developed for predicting sea level and currants in estuarine and shelf waters. The basic idea of the approach is to use a set of coupled quasi-...

Malcolm L. Spaulding

1984-05-01T23:59:59.000Z

219

Two phase pressure drop in inclined and vertical pipes  

E-Print Network (OSTI)

A method of calculating the pressure drop in inclined and vertical oil-gas wells is proposed. The data used to establish the method is from a variety of sources but is largely from air and water flowing in systems close ...

Griffith, P.

1973-01-01T23:59:59.000Z

220

On channels with finite Holevo capacity  

E-Print Network (OSTI)

We consider a nontrivial class of infinite dimensional quantum channels characterized by finiteness of the Holevo capacity. Some general properties of channels of this class are described. In particular, a special sufficient condition of existence of an optimal measure is obtained and examples of channels with no optimal measure are constructed. It is shown that each channel with finite Holevo capacity has a natural extension to the set of all positive normalized functionals on the algebra of all bounded operators. General properties of such an extension are described. The class of infinite dimensional channels, for which the Holevo capacity can be explicitly determined, is considered.

M. E. Shirokov

2006-02-07T23:59:59.000Z

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


221

Steam-channel-expanding steam form drive  

SciTech Connect

In a viscous oil reservoir in which the stratification of the rock permeability is insufficient to confine steam within the most permeable strata, oil can be produced by forming and expanding a steam channel through which steam is flowed and oil is produced. Steam is injected and fluid is produced at rates causing a steam channel to be extended between locations that are horizontally separated. A foam-forming mixture of steam, noncondensable gas and surfactant is then injected into the steam channel to provide foam and a relatively high pressure gradient within the channel, without plugging the channel. A flow of steam-containing fluid through the steam channel is continued in a manner such that the magnitudes of the pressure gradient, the rate of oil production, and the rate of steam channel expansion exceed those which could be provided by steam alone. 10 claims, 6 figures.

Dilgren, R.E.; Hirasaki, G.J.; Hill, H.J.; Whitten, D.G.

1978-05-02T23:59:59.000Z

222

Quantum polar codes for arbitrary channels  

E-Print Network (OSTI)

We construct a new entanglement-assisted quantum polar coding scheme which achieves the symmetric coherent information rate by synthesizing "amplitude" and "phase" channels from a given, arbitrary quantum channel. We first demonstrate the coding scheme for arbitrary quantum channels with qubit inputs, and we show that quantum data can be reliably decoded by O(N) rounds of coherent quantum successive cancellation, followed by N controlled-NOT gates (where N is the number of channel uses). We also find that the entanglement consumption rate of the code vanishes for degradable quantum channels. Finally, we extend the coding scheme to channels with multiple qubit inputs. This gives a near-explicit method for realizing one of the most striking phenomena in quantum information theory: the superactivation effect, whereby two quantum channels which individually have zero quantum capacity can have a non-zero quantum capacity when used together.

Wilde, Mark M

2012-01-01T23:59:59.000Z

223

Measurement of Vertical Kinetic Energy and Vertical Velocity Skewness in Oceanic Boundary Layers by Imperfectly Lagrangian Floats  

Science Conference Proceedings (OSTI)

The effects of upward buoyancy on the accuracy with which Lagrangian floats can measure the Eulerian mean variance wwE and skewness SwE of vertical fluid velocity w in the wind-driven upper-ocean boundary layer is investigated using both ...

Ramsey R. Harcourt; Eric A. D’Asaro

2010-11-01T23:59:59.000Z

224

Vertical Differencing of the Primitive Equations Based on the Charney–Phillips Grid in Hybrid &sigma–p Vertical Coordinates  

Science Conference Proceedings (OSTI)

Two types of vertical grids are used for atmospheric models: the Lorenz grid (L grid) and the Charney–Phillips grid (CP grid). Although the CP grid is the standard grid for quasigenstrophic models, it is not widely used in the primitive equation ...

Akio Arakawa; Celal S. Konor

1996-03-01T23:59:59.000Z

225

Conductive Channel for Energy Transmission  

SciTech Connect

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.

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

2011-11-10T23:59:59.000Z

226

Multiple channel programmable coincidence counter  

DOE Patents (OSTI)

A programmable digital coincidence counter having multiple channels and featuring minimal dead time. Neutron detectors supply electrical pulses to a synchronizing circuit which in turn inputs derandomized pulses to an adding circuit. A random access memory circuit connected as a programmable length shift register receives and shifts the sum of the pulses, and outputs to a serializer. A counter is input by the adding circuit and downcounted by the serializer, one pulse at a time. The decoded contents of the counter after each decrement is output to scalers.

Arnone, G.J.

1989-02-27T23:59:59.000Z

227

Performance of a well with lateral and vertical wellbores  

E-Print Network (OSTI)

This thesis presents three major topics: analysis of pressure transient behavior of horizontal wells, analysis of pressure transient behavior of slanted wells, and performance analysis of wells with lateral and vertical wellbores. Additional analysis of actual well test data is also provided. For horizontal wells, we focus on analysis pressure solution for pseudoradial flow. Limited entry slanted wells are considered in this work by comparing wells with different angles and evaluating the performance. Modeling and performance analysis of a well with lateral and vertical wellbores is the last topic. The specific tasks achieved in this work include the following: We have compared four methods for analyzing pseudoradial flow found in the literature (Odeh and Babu, Joshi, Kuchuk et al., and Lichtenberger) and verified their methods using reservoir simulation. We found that the methods by Kuchuk et al. and Joshi are the most accurate while the method by Lichtenberger has the biggest error. We have modeled and examined the performance of slanted wells with different angles. The well length is equal to formation thickness and is kept constant. It has proven that the performance of slanted wells is proportional to the increase of the well angles only up to 60°. Further increasing the well angle will not make the well performance better than a vertical well. We have modeled and analyzed performance of combination wells. We compared the performance of vertical, slanted, and combination wells. Based on that comparison, the combination well has the best performance compared to other well geometries. By having a lateral section beside the vertical section, the performance of the well changes significantly. We have performed an analysis of actual injectivity test data from a well with lateral and vertical wellbores. The proper analysis obtained by correcting the pressure changes confirmed that the semilog straight line shows infinite acting radial flow. The permeability is 62.3 md, obtained by taking a correct slope of 260 psi/cycle. As of now, the radius of investigation is 8287 ft. It needs 7.9 years of injection to reach 850 psig of wellhead pressure.

Abdat, Toriq

2002-01-01T23:59:59.000Z

228

Ka-Band ARM Zenith Radar (KAZR) Instrument Handbook  

SciTech Connect

The Ka-band ARM zenith radar (KAZR) is a zenith-pointing Doppler cloud radar operating at approximately 35 GHz. The KAZR is an evolutionary follow-on radar to ARM's widely successful millimeter-wavelength cloud radar (MMCR). The main purpose of the KAZR is to provide vertical profiles of clouds by measuring the first three Doppler moments: reflectivity, radial Doppler velocity, and spectra width. At the sites where the dual-polarization measurements are made, the Doppler moments for the cross-polarization channel are also available. In addition to the moments, velocity spectra are also continuously recorded for each range gate.

Widener, K; Bharadwaj, N; Johnson, K

2012-03-06T23:59:59.000Z

229

Water Velocity Measurements on a Vertical Barrier Screen at the Bonneville Dam Second Powerhouse  

Science Conference Proceedings (OSTI)

Fish screens at hydroelectric dams help to protect rearing and migrating fish by preventing them from passing through the turbines and directing them towards the bypass channels by providing a sweeping flow parallel to the screen. However, fish screens may actually be harmful to fish if they become impinged on the surface of the screen or become disoriented due to poor flow conditions near the screen. Recent modifications to the vertical barrier screens (VBS) at the Bonneville Dam second powerhouse (B2) intended to increase the guidance of juvenile salmonids into the juvenile bypass system (JBS) have resulted in high mortality and descaling rates of hatchery subyearling Chinook salmon during the 2008 juvenile salmonid passage season. To investigate the potential cause of the high mortality and descaling rates, an in situ water velocity measurement study was conducted using acoustic Doppler velocimeters (ADV) in the gatewell slot at Units 12A and 14A of B2. From the measurements collected the average approach velocity, sweep velocity, and the root mean square (RMS) value of the velocity fluctuations were calculated. The approach velocities measured across the face of the VBS varied but were mostly less than 0.3 m/s. The sweep velocities also showed large variances across the face of the VBS with most measurements being less than 1.5 m/s. This study revealed that the approach velocities exceeded criteria recommended by NOAA Fisheries and Washington State Department of Fish and Wildlife intended to improve fish passage conditions.

Hughes, James S.; Deng, Zhiqun; Weiland, Mark A.; Martinez, Jayson J.; Yuan, Yong

2011-11-22T23:59:59.000Z

230

A better understanding of a Uinta Basin channelized analog reservoir through geostatistics and reservoir simulation  

E-Print Network (OSTI)

The Green River Formation is located in the Uinta basin of northeastern Utah. It contains several reservoirs that can be classified as lacustrine such as the Altamont-Bluebell and Red Wash. Lacustrine reservoirs are abundant in other provinces in the world such as China, Southeast Asia, Brazil, West Africa, and the Caspian Sea. Even though they can contain important accumulations of hydrocarbons, our understanding of the primary controls on fluid flow within these systems is still not clear. This ambiguity leads in some cases to inefficient recovery of hydrocarbons in such reservoirs. This study is aimed at clarifying the effects of heterogeneities in channelized reservoirs on fluid flow. It uses a multidisciplinary approach combining geologic knowledge with reservoir engineering. It involves the geologic modeling and fluid flow simulation of a channelized outcrop of the Green River formation. The study of this outcrop provides insights for modeling, understanding, and possibly predicting the behavior of channelized oil and gas reservoirs. Results show that the number of channels in the model can have a significant effect on performance. The rock properties in these channels and the channel paths are also important factors that determine the recovery efficiency. Other findings include the effect on performance of vertical anisotropy in a channelized reservoir. We discovered that an isotropic reservoir performs better than an anisotropic one and that the well perforation interval is extremely important when comparing the performance of several anisotropic cases. Finally, we investigated the effects of the recovery strategy on performance in a channelized setting. We found that waterflooding yields better results than any of the other recovery techniques analyzed. Sensitivity runs with different waterflood patterns indicated that a staggered line drive results in the best performance in the analog channelized reservoir we modeled, as it allows for the best recovery factor in the least amount of time. The results of this work can be used qualitatively to predict performance in a channelized setting but their use is limited quantitatively because of the issue of scale, i.e. the outcrop width is much less than typical interwell scale.

Robbana, Enis

2002-01-01T23:59:59.000Z

231

A semi-custom dual channel peak hold circuit for spaceborne instrumentation  

Science Conference Proceedings (OSTI)

A monolithic dual channel peak hold circuit is developed using a semi-custom Application Specific Integrated Circuit (ASIC). The circuit is designed specifically for spaceborne instrumentation that requires low power operation and low mass packaging. Each independent circuit holds positive pulses and consists of a differential transconductance amplifier followed by a one way current amplifier. Input gate and output hold functions are enabled by standard TTL or CMOS logic levels. To accommodate a range of applications. quiescent power is adjustable for performance-power tradeoff or can be disabled for single channel use. Fabricated with dielectrically isolated vertical geometry NPN and PNP transistors the circuit is inherently radiation-hard and immune to transient upset.

Sweet, M.R.; Grace, K.M.

1992-01-01T23:59:59.000Z

232

A semi-custom dual channel peak hold circuit for spaceborne instrumentation  

SciTech Connect

A monolithic dual channel peak hold circuit is developed using a semi-custom Application Specific Integrated Circuit (ASIC). The circuit is designed specifically for spaceborne instrumentation that requires low power operation and low mass packaging. Each independent circuit holds positive pulses and consists of a differential transconductance amplifier followed by a one way current amplifier. Input gate and output hold functions are enabled by standard TTL or CMOS logic levels. To accommodate a range of applications. quiescent power is adjustable for performance-power tradeoff or can be disabled for single channel use. Fabricated with dielectrically isolated vertical geometry NPN and PNP transistors the circuit is inherently radiation-hard and immune to transient upset.

Sweet, M.R.; Grace, K.M.

1992-12-01T23:59:59.000Z

233

MHK Technologies/Vertical Axis Venturi System | Open Energy Information  

Open Energy Info (EERE)

Axis Venturi System Axis Venturi System < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage 275px Technology Profile Primary Organization Warrior Girl Corporation Technology Resource Click here Current Technology Type Click here Axial Flow Turbine Technology Readiness Level Click here TRL 1 3 Discovery Concept Def Early Stage Dev Design Engineering Technology Description The proprietary venturi system uses two venturies one on the upstream side of the vertical axis turbine to force the water flow into the turbine and one at the downstream side of the turbine which creates a lower pressure region that pulls the water through the turbine The vertical axis orientation of the turbine is believed by the company to allow for efficiency gains

234

The Effect of Vertical Upward Flow on Thermal Plumes  

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

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

235

Vertical Seismic Profiling (Majer, 2003) | Open Energy Information  

Open Energy Info (EERE)

(Majer, 2003) (Majer, 2003) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Vertical Seismic Profiling (Majer, 2003) Exploration Activity Details Location Unspecified Exploration Technique Vertical Seismic Profiling Activity Date Usefulness not indicated DOE-funding Unknown Notes The goal of this work is to evaluate the most promising methods and approaches that may be used for improved geothermal exploration and reservoir assessment. It is not a comprehensive review of all seismic methods used to date in geothermal environments. This work was motivated by a need to assess current and developing seismic technology that if applied in geothermal cases may greatly improve the chances for locating new geothermal resources and/or improve assessment of current ones.

236

Contrast between the vertical and horizontal mercury discharge lamps  

SciTech Connect

This paper discusses the thermal behavior of a high pressure mercury lamp in a horizontal position, compared with that of a vertical lamp. The model adopted is three-dimensional, steady, and powered DC. After the model validation, we analyzed temperature fields and velocities for the case of the lamp in a horizontal position by comparing it with those of a lamp in vertical position. This setting initially fixed the wall temperature equal to 1000 K. However, the morphology of the temperature profile in the case of the horizontal lamp indicates that the temperature of the wall cannot be uniform. Thus, we have, in a second time, performed an energy balance at the wall to calculate its temperature. This aims to understand the influence of convection on the thermal properties of the source.

Ben Hamida, M. B.; Helali, H.; Araoud, Z.; Charrada, K. [Unite d'Etude des Milieux Ionises et Reactifs, IPEIM, 5019 route de Kairouan Monastir (Tunisia)

2011-06-15T23:59:59.000Z

237

Electrically injected visible vertical cavity surface emitting laser diodes  

DOE Patents (OSTI)

Visible laser light output from an electrically injected vertical cavity surface emitting laser (VSCEL) diode is enabled by the addition of phase-matching spacer layers on either side of the active region to form the optical cavity. The spacer layers comprise InAlP which act as charge carrier confinement means. Distributed Bragg reflector layers are formed on either side of the optical cavity to act as mirrors. 5 figs.

Schneider, R.P.; Lott, J.A.

1994-09-27T23:59:59.000Z

238

Applying Alpha-Channeling to Mirror Machines  

SciTech Connect

The ?-channeling effect entails the use of radio-frequency waves to expel and cool high-energetic ?- particles born in a fusion reactor; the device reactivity can then be increased even further by redirecting the extracted energy to fuel ions. Originally proposed for tokamaks, this technique has also been shown to benefi t open-ended fusion devices. Here, the fundamental theory and practical aspects of ?- channeling in mirror machines are reviewed, including the influence of magnetic field inhomogeneity and the effect of a finite wave region on the ?-channeling mechanism. For practical implementation of the ? -channeling effect in mirror geometry, suitable contained weakly-damped modes are identifi ed. In addition, the parameter space of candidate waves for implementing the ? -channeling effect can be signi cantly extended through the introduction of a suitable minority ion species that has the catalytic effect of moderating the transfer of power from the ?-channeling wave to the fuel ions.

A.I. Zhmoginov and N.J. Fisch

2012-03-16T23:59:59.000Z

239

MHL Free Surface Channel | Open Energy Information  

Open Energy Info (EERE)

MHL Free Surface Channel MHL Free Surface Channel Jump to: navigation, search Basic Specifications Facility Name MHL Free Surface Channel Overseeing Organization University of Michigan Hydrodynamics Hydrodynamic Testing Facility Type Channel Beam(m) 1.0 Depth(m) 0.6 Cost(per day) $2000 (+ Labor/Materials) Towing Capabilities Towing Capabilities Yes Maximum Velocity(m/s) 2 Wavemaking Capabilities Wavemaking Capabilities None Channel/Tunnel/Flume Channel/Tunnel/Flume Yes Velocity(m/s) 2 Recirculating No Wind Capabilities Wind Capabilities None Control and Data Acquisition Description Custom Data Acquisition System using National Instruments hardware; system compatible with Planing Hull and Floating Beam Dynamometers Custom Data Acquisition System using National Instruments hardware; system compatible with Planing Hull and Floating Beam Dynamometers

240

Low profile, high load vertical rolling positioning stage  

DOE Patents (OSTI)

A stage or support platform assembly for use in a synchrotron accurately positions equipment to be used in the beam line of the synchrotron. The support platform assembly includes an outer housing in which is disposed a lifting mechanism having a lifting platform or stage at its upper extremity on which the equipment is mounted. A worm gear assembly is located in the housing and is adapted to raise and lower a lifting shaft that is fixed to the lifting platform by an anti-binding connection. The lifting platform is moved vertically as the lifting shaft is moved vertically. The anti-binding connection prevents the shaft from rotating with respect to the platform, but does permit slight canting of the shaft with respect to the lifting platform so as to eliminate binding and wear due to possible tolerance mismatches. In order to ensure that the lifting mechanism does not move in a horizontal direction as it is moved vertically, at least three linear roller bearing assemblies are arranged around the outer-periphery of the lifting mechanism. One of the linear roller bearing assemblies can be adjusted so that the roller bearings apply a loading force against the lifting mechanism. Alternatively, a cam mechanism can be used to provide such a loading force.

Shu, Deming (Darien, IL); Barraza, Juan (Aurora, IL)

1996-01-01T23:59:59.000Z

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


241

DEVELOPMENT OF TECHNOLOGY TO REMOTELY NAVIGATE VERTICAL PIPE ARRAYS  

Science Conference Proceedings (OSTI)

Situations exist around the Savannah River Site (SRS) and the Department of Energy (DOE) complex where it is advantageous to remotely navigate vertical pipe arrays. Specific examples are waste tanks in the SRS Tank Farms, which contain horizontal cooling coils at the tank bottom, vertical cooling coils throughout and a limited number of access points or ''risers''. These factors limit accessibility to many parts of these tanks by conventional means. Pipe Traveler technology has been developed to address these issues. The Pipe Traveler addresses these issues by using the vertical cooling coils as its medium of travel. The unit operates by grabbing a pipe using dual grippers located on either side of the equipment. Once securely attached to the pipe a drive wheel is extended to come in contact with the pipe. Rotation of the drive wheel causes the unit to rotate around the pipe. This action is continued until the second set of grippers is aligned with the next pipe. Extension pistons are actuated to extend the second set of grippers in contact with a second pipe. The second set of grippers is then actuated to grasp the pipe. The first set of grippers releases the original pipe and the process is repeated until the unit reaches its desired location. Once at the tool deployment location the desired tool may be used. The current design has proven the concept of pipe-to-pipe navigation. Testing of the Pipe Traveler has proven its ability to transfer itself from one pipe to another.

Krementz, D.; Immel, D.; Vrettos, N.; Nance, T.; Marzolf, A.

2011-07-01T23:59:59.000Z

242

Entanglement Transmission Capacity of Compound Channels  

E-Print Network (OSTI)

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.

Igor Bjelakovic; Holger Boche; Janis Noetzel

2009-04-20T23:59:59.000Z

243

Propagation of premixed flames in confined channels.  

E-Print Network (OSTI)

??The propagation of premixed flames in confined channels is investigated. In the unconfined case, the structure of the flame and the flame speed for the… (more)

Navaneetha, Arjun

2013-01-01T23:59:59.000Z

244

Scattering of Sound by Internal Wave Currents: The Relation to Vertical Momentum Flux  

Science Conference Proceedings (OSTI)

Internal waves scatter sound by two related perturbations: 1) those associated with vertical particle displacements ?(x, y, z, t) in the presence of a vertical gradient of (potential) sound speed (?c = ??zcp); and 2) those associated with ...

W. Munk; P. Worcester; F. Zachariasen

1981-04-01T23:59:59.000Z

245

On the Vertical Scale of Gravity Waves Excited by Localized Thermal Forcing  

Science Conference Proceedings (OSTI)

Gravity waves generated by convective heating are widely believed to have vertical wavelengths approximately twice the depth of the heating. The frequency, horizontal, and vertical wavelengths of gravity waves are, however, mutually related ...

J. R. Holton; J. H. Beres; X. Zhou

2002-06-01T23:59:59.000Z

246

A Comparison of Vertical Velocity in Cirrus Obtained from Aircraft and Lidar Divergence Measurements during FIRE  

Science Conference Proceedings (OSTI)

Techniques are presented to obtain vertical velocity in cirrus clouds from in situ aircraft lateral wind measurements and from ground-based remote Doppler lidar measurements. In general, direct measurements of absolute vertical velocity w from ...

I. Gultepe; A. J. Heymsfield; D. H. Lenschow

1990-02-01T23:59:59.000Z

247

On the Sensitivity of Thermocline Depth and Meridional Heat Transport to Vertical Diffusivity in OGCMS  

Science Conference Proceedings (OSTI)

Aimed at a further understanding of the role of vertical diffusivity in determining the vertical structure of the thermocline circulation and meridional heat transport in ocean general circulation models (OGCMS), sensitivity of a box-basin ...

Dingming Hu

1996-08-01T23:59:59.000Z

248

An Investigation of an Arctic Front with a Vertically Nested Mesoscale Model  

Science Conference Proceedings (OSTI)

A vertically mesoscale regional numerical weather prediction model is used to simulate an arctic front. The front was observed during the Arctic Cyclone Expedition of 1984. The regional model employs a unique vertical nesting scheme in which the ...

William T. Thompson; Stephen D. Burk

1991-02-01T23:59:59.000Z

249

The Mean Meridional Circulation of the Atmosphere Using the Mass above Isentropes as the Vertical Coordinate  

Science Conference Proceedings (OSTI)

The mean meridional circulation of the atmosphere is presented using the mass (more specifically, the pressure corresponding to the mass) above the isentrope of interest as the vertical coordinate. In this vertical coordinate, the mass-weighted ...

Gang Chen

2013-07-01T23:59:59.000Z

250

The Dependence of Numerically Simulated Convective Storms on Vertical Wind Shear and Buoyancy  

Science Conference Proceedings (OSTI)

The effects of vertical wind shear and buoyancy on convective storm structure and evolution are investigated with the use of a three-dimensional numerical cloud model. By varying the magnitude of buoyant energy and one-directional vertical shear ...

M. L. Weisman; J. B. Klemp

1982-06-01T23:59:59.000Z

251

Computation of Vertical Profiles of Longwave Radiative Cooling over the Equatorial Pacific  

Science Conference Proceedings (OSTI)

An important quantity whose magnitude has not been thoroughly examined is the vertical distribution of heating in the Tropics. The details of the vertical distribution of heating have a significant impact on a number of phenomena, including the ...

Perry G. Ramsey; Dayton G. Vincent

1995-05-01T23:59:59.000Z

252

Effects of Small-Scale Vertical Motion on Radar Measurements of Wind and Temperature Profiles  

Science Conference Proceedings (OSTI)

Vertical velocities were observed during the month of June 1990 with two side-by-side wind profilers at Platteville, Colorado. Many of the observations reveal strong wave motion, probably mountain lee waves, that sometimes caused vertical ...

B. L. Weber; D. B. Wuertz; D. C. Law; A. S. Frisch; J. M. Brown

1992-06-01T23:59:59.000Z

253

The Vertical Resolution of the Kennedy Space Center 50-MHz Wind Profiler  

Science Conference Proceedings (OSTI)

The effective vertical resolution of the Kennedy Space Center 50-MHz Doppler radar wind profiler is determined using vertical wavenumber spectra and temporal coherence. The resolution ranges from being Nyquist limited at 300 m to as coarse as 900 ...

Francis J. Merceret

1999-09-01T23:59:59.000Z

254

A Theoretical Method for Computing Vertical Distributions of Acidity and Sulfate Production within Cumulus Clouds  

Science Conference Proceedings (OSTI)

An aqueous chemistry model has been combined with an entraining cumulus cloud model to predict vertical distributions of pH (=?log10[H+]) within a cloud. The cloud model predicts vertical variations of temperature, pressure, entrainment and ...

Chris J. Walcek; Gregory R. Taylor

1986-02-01T23:59:59.000Z

255

Determining Turbulent Vertical Velocity, and Fluxes of Heat and Salt with an Autonomous Underwater Vehicle  

Science Conference Proceedings (OSTI)

The authors show that vertical turbulent fluxes in the upper ocean can be measured directly with an autonomous underwater vehicle (AUV). A horizontal profile of vertical water velocity is obtained by applying a Kalman smoother to AUV motion data. ...

Daniel R. Hayes; James H. Morison

2002-05-01T23:59:59.000Z

256

A Vertical Finite-Difference Scheme Based on a Hybrid ?-?-p Coordinate  

Science Conference Proceedings (OSTI)

A vertical discretization of the primitive equations in a general vertical coordinate is described that enables a primitive equation model to use terrain-following sigma levels near the ground and isentropic levels higher up, with a smooth ...

Zhengxin Zhu; John Thuburn; Brian J. Hoskins; Peter H. Haynes

1992-05-01T23:59:59.000Z

257

The Role of Shearwise and Transverse Quasigeostrophic Vertical Motions in the Midlatitude Cyclone Life Cycle  

Science Conference Proceedings (OSTI)

The total quasigeostrophic (QG) vertical motion field is partitioned into transverse and shearwise couplets oriented parallel to, and along, the geostrophic vertical shear, respectively. The physical role played by each of these components of ...

Jonathan E. Martin

2006-04-01T23:59:59.000Z

258

Equatorial Inertial Instability: Effects of Vertical Finite Differencing and Radiative Transfer  

Science Conference Proceedings (OSTI)

The effect of vertical differencing on equatorial inertial instability is studied and explicit results obtained for growth rates as a function of the vertical resolution. It is found that for a basic state independent of height, the form of the ...

P. D. Clark; P. H. Haynes

1994-07-01T23:59:59.000Z

259

Bifurcation and Stability of Low-Order Steady Flows in Horizontally and Vertically Forced Convection  

Science Conference Proceedings (OSTI)

The response of a convecting fluid to externally imposed horizontal and vertical temperature gradients is fundamentally different from that obtained when only vertical forcing is present. Using a three-component spectral model of two-dimensional ...

David A. Yost; Hampton N. Shirer

1982-01-01T23:59:59.000Z

260

Vertical Structure of Tropical Cyclones with Concentric Eyewalls as Seen by the TRMM Precipitation Radar  

Science Conference Proceedings (OSTI)

Ten years of data from the Tropical Rainfall Measurement Mission satellite’s Precipitation Radar are analyzed to determine the typical vertical structure of the concentric eyewalls of tropical cyclones undergoing eyewall replacement. The vertical ...

Deanna A. Hence; Robert A. Houze Jr.

2012-03-01T23:59:59.000Z

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


261

Vertical Diffusion in the Lower Atmosphere Using Aircraft Measurements of 222Rn  

Science Conference Proceedings (OSTI)

Vertical profiles of 222Rn concentrations measured from 3 to 6 September 1995 in the northeastern United States, using a new radon instrument designed for aircraft measurements, are presented. A vertical diffusion model was employed to simulate ...

H. N. Lee; R. J. Larsen

1997-09-01T23:59:59.000Z

262

Kinematic Vertical Motion and Relative Vorticity Profiles in a Long-Lived Midlatitude Convective System  

Science Conference Proceedings (OSTI)

Average kinematic vertical motion and relative vorticity profiles are presented for a long-lived midlatitude convective complex. A breakdown into active convective and stratiform precipitation regions shows very good agreement in the vertical ...

Lance F. Bosart

1986-06-01T23:59:59.000Z

263

The Design of Smooth, Conservative Vertical Grids for Interactive Grid Nesting with Stretching  

Science Conference Proceedings (OSTI)

This note describes how to generate vertically stretched grids within the context of vertical nesting that are consistent with the conservative interpolation formula used by Clark and Farley. It is shown that all nested grids derive their ...

Terry L. Clark; William D. Hall

1996-06-01T23:59:59.000Z

264

Wind Profiler Observations of Vertical Motion and Precipitation Microphysics of a Tropical Squall Line  

Science Conference Proceedings (OSTI)

Data from a wind profiler located at Darwin, Australia, have been used to examine the vertical motions and precipitation microphysics in a well-developed squall line. Both a mature and developing convective cell are well sampled. The vertical ...

Peter T. May; Deepak K. Rajopadhyaya

1996-04-01T23:59:59.000Z

265

Vertical Wind Variability Observed by VHF Radar in the Lee of the Colorado Rockies  

Science Conference Proceedings (OSTI)

During March 1981 the Sunset and Platteville VHF clear-air radars located in Colorado to the east of the continental divide observed vertical winds continuously over a three-week period. The vertical winds at these locations contain fluctuations ...

W. L. Ecklund; K. S. Gage; B. B. Balsley; R. G. Strauch; J. L. Green

1982-10-01T23:59:59.000Z

266

The Deep-Atmosphere Euler Equations in a Generalized Vertical Coordinate  

Science Conference Proceedings (OSTI)

Previous analysis of the hydrostatic primitive equations using a generalized vertical coordinate is extended to the deep-atmosphere nonhydrostatic Euler equations, and some special vertical coordinates of interest are noted. Energy and axial ...

Andrew Staniforth; Nigel Wood

2003-08-01T23:59:59.000Z

267

Spatiotemporal Variation of the Vertical Gradient of Rainfall Rate Observed by the TRMM Precipitation Radar  

Science Conference Proceedings (OSTI)

Seasonal and spatial variation of the vertical gradient of rainfall rate was investigated using global precipitation data observed by the Precipitation Radar (PR) on the Tropical Rainfall Measuring Mission (TRMM) satellite. The vertical gradient ...

Masafumi Hirose; Kenji Nakamura

2004-09-01T23:59:59.000Z

268

The Diagnosis of Synoptic-Scale Vertical Motion in an Operational Environment  

Science Conference Proceedings (OSTI)

The physical reason for quasi-geostrophic vertical motion is reviewed. Various techniques for estimating synoptic-scale vertical motion are examined, and their utility (or lack thereof) is illustrated by a case study. The Q-vector approach ...

Dale R. Durran; Leonard W. Snellman

1987-03-01T23:59:59.000Z

269

The Vertical Structure of Temperature in the Tropics: Different Flavors of El Niño  

Science Conference Proceedings (OSTI)

To explore the vertical coherence of the vertical temperature structure in the atmosphere, an analysis is performed of the full three-dimensional spatial structure of the temperature field monthly mean anomalies from the 40-yr ECMWF Re-Analysis (...

Kevin E. Trenberth; Lesley Smith

2006-10-01T23:59:59.000Z

270

A Vertically Nested Regional Numerical Weather Prediction Model with Second-Order Closure Physics  

Science Conference Proceedings (OSTI)

The model we describe involves a unique strategy in which a high vertical resolution grid is nested within the coarse vertical resolution grid of a regional numerical weather prediction (NWP) model. Physics computations performed on the high ...

Stephen D. Burk; William T. Thompson

1989-11-01T23:59:59.000Z

271

Lidar Observations of the Vertical Aerosol Flux in the Planetary Boundary Layer  

Science Conference Proceedings (OSTI)

The vertical aerosol transport in the planetary boundary layer (PBL) is investigated with lidars. Profiles of the vertical wind velocity are measured with a 2-?m Doppler wind lidar. Aerosol parameters are derived from observations with an aerosol ...

Ronny Engelmann; Ulla Wandinger; Albert Ansmann; Detlef Müller; Egidijus Žeromskis; Dietrich Althausen; Birgit Wehner

2008-08-01T23:59:59.000Z

272

The classical capacity of quantum channels with memory  

E-Print Network (OSTI)

We investigate the classical capacity of two quantum channels with memory: a periodic channel with depolarizing channel branches, and a convex combination of depolarizing channels. We prove that the capacity is additive in both cases. As a result, the channel capacity is achieved without the use of entangled input states. In the case of a convex combination of depolarizing channels the proof provided can be extended to other quantum channels whose classical capacity has been proved to be additive in the memoryless case.

Tony Dorlas; Ciara Morgan

2009-02-17T23:59:59.000Z

273

The classical capacity of quantum channels with memory  

E-Print Network (OSTI)

We investigate the classical capacity of two quantum channels with memory: a periodic channel with depolarizing channel branches, and a convex combination of depolarizing channels. We prove that the capacity is additive in both cases. As a result, the channel capacity is achieved without the use of entangled input states. In the case of a convex combination of depolarizing channels the proof provided can be extended to other quantum channels whose classical capacity has been proved to be additive in the memoryless case.

Dorlas, Tony

2009-01-01T23:59:59.000Z

274

Vertical-axis wind turbines -- The current status of an old technology  

DOE Green Energy (OSTI)

Vertical-axis wind turbine technology is not well understood, even though the earliest wind machines rotated about a vertical axis. The operating environment of a vertical-axis wind turbine is quite complex, but detailed analysis capabilities have been developed and verified over the last 30 years. Although vertical-axis technology has not been widely commercialized, it exhibits both advantages and disadvantages compared to horizontal-axis technology, and in some applications, it appears to offer significant advantages.

Berg, D.E.

1996-12-31T23:59:59.000Z

275

Blade Offset and Pitch Effects on a High Solidity Vertical Axis Wind Turbine  

E-Print Network (OSTI)

ABSTRACT A high solidity, small scale, 2.5m diameter by 3m high Vertical Axis Wind Turbine (VAWT, performance 1. INTRODUCTION Small scale vertical axis wind turbines (VAWTs) show potential for urban rooftop turbines. Keywords: Vertical Axis Wind Turbine, VAWT, airfoil, pitch, blade, mount, offset, high solidity

Tullis, Stephen

276

Well Posedness of the Initial Value Problem for Vertically Discretized Hydrostatic Equations  

Science Conference Proceedings (OSTI)

Vertically discretized linearized hydrostatic equations in hybrid coordinates are considered. The matrix of vertical structure, which depends on vertical discretization and determines the classification of the obtained system of time-dependent partial ... Keywords: initial value problems, numerical weather prediction, oscillatory matrices, well posedness

Andrei Bourchtein; Vladimir Kadychnikov

2003-01-01T23:59:59.000Z

277

An Examination of the Efficiency, Foreclosure, and Collusion Rationales for Vertical Takeovers  

Science Conference Proceedings (OSTI)

We investigate the efficiency, foreclosure, and collusion rationales for vertical integration in a large sample of vertically related takeovers. The efficiency rationale, as discussed under the transaction cost economics and property rights theories, ... Keywords: acquisitions, antitrust, collusion, corporate finance, corporate restructuring, efficiency, finance, firm boundaries, foreclosure, market power, mergers, product markets, vertical integration

Jaideep Shenoy

2012-08-01T23:59:59.000Z

278

Holocene deposition in Northwest Providence Channel, Bahamas: a geochemical approach  

SciTech Connect

The origins and depositional history of Holocene sediment in Northwest Providence Channel, Bahamas (NWPC) have been determined using geochemical measurements coupled with textural data, petrographic examination, and scanning electron microscopy. Most of the channel is 200 to 2000 m deep, and nearly 100% of the sediment is calcium carbonate. Shallow water platform sources contribute 75-90% of the Holocene sediment in NWPC. Bank derived sand is most abundant near the platforms (nearly 100%) and is concentrically distributed around a central area of abundant non-platform sand. Bank-derived mud (<62 ..mu..m) accounts for more than 80% of the mud fraction in NWPC. The coarse silt (62-16 ..mu..m), fine silt (16-4 ..mu..m) and clay (< 4 ..mu..m) fractions from LLB (Bight of Abaco) are geochemically distinct from the mud fractions of Great Bahama Bank (GBB). Their distributions in NWPC demonstrate that both platforms are significant sediment contributors to NWPC. The observed sediment distribution clearly indicates that significant off bank transport occurs. With regard to sediment transport, no windward or leeward effects are observed in Holocene sediment deposition. Gravity flow processes are not significant to Holocene deposition. 80% of the present sedimentation rate results from the banktop flooding and confirms that 75%-90% of the Holocene sediment is derived from platform sources. The C-14 dated Holocene sediment layer is approximately 50 cm thick, and its transition with the Pleistocene occurs over a vertical interval of less than 20 cm as a result of mixing by benthonic organisms. This Holocene sediment layer should remain intact to permanently record this banktop episode, and should have a different diagenetic future from the underlying stable (calcite-rich) sediment.

Boardman, M.R.

1978-01-01T23:59:59.000Z

279

Bunch Coalescing in a Helical Channel  

Science Conference Proceedings (OSTI)

A high-luminosity Muon Collider requires bunch recombination for optimal luminosity. In this paper, we take advantage of the large slip factor attainable in a helical transport channel (HTC) to coalesce bunches of muons into a single one over a shorter distance than can be achieved over a straight channel.

Neuffer, D.V.; Yonehara, K.; /Fermilab; Ankenbrandt, C.M.; Yoshikawa, C.Y.; /MUONS Inc., Batavia

2012-05-01T23:59:59.000Z

280

Probabilistic secret sharing through noisy quantum channel  

Science Conference Proceedings (OSTI)

In a realistic situation, the secret sharing of classical or quantum information will involve the transmission of this information through noisy channels. We consider a three qubit pure state. This state becomes a mixed-state when the qubits are distributed ... Keywords: GHZ states, POVM, phase damping channel, secret sharing

Satyabrata Adhikari; Indranil Chakrabarty; Pankaj Agrawal

2012-03-01T23:59:59.000Z

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


281

UWB channel measurements for accurate indoor localization  

Science Conference Proceedings (OSTI)

Recently, indoor localization has attracted considerable attention. More importantly, indoor channel measurements and models are very essential to accurate characterization of the ranging error for military applications. This paper provides the results ... Keywords: channel measurement, geolocation, path loss, ranging, ultra-wideband

Bardia Alavi; Nayef Alsindi; Kaveh Pahlavan

2006-10-01T23:59:59.000Z

282

Value-passing CCS with noisy channels  

Science Conference Proceedings (OSTI)

Value-passing CCS, a full version of Milner's CCS, is a process algebra in which actions consist of sending and receiving values through noiseless communication channels. The full calculus is a succinct yet expressive language for the specification and ... Keywords: Barbed congruence, Bisimilarity, Noisy channel, Probabilistic modal logic, Value-passing CCS

Shuqin Huang; Yongzhi Cao; Hanpin Wang; Wanling Qu

2012-05-01T23:59:59.000Z

283

Identification of Vertical Profiles of Radar Reflectivity for Hydrological Applications Using an Inverse Method. Part I: Formulation  

Science Conference Proceedings (OSTI)

The vertical variability of reflectivity in the radar beam is one of the main sources of error in estimating rainfall intensity. This vertical variability, which has several origins, is characterized globally by a function called "vertical ...

Hervé Andrieu; Jean Dominique Creutin

1995-01-01T23:59:59.000Z

284

Simultaneous global coupling and vertical dispersion correction in RHIC  

SciTech Connect

Residual vertical dispersion on the order of +/-0.2 m (peak to peak) has been measured at store energies for both polarized protons and heavy ion beams in RHIC. The hypothesis is that this may have impact on the polarization transmission efficiency during the energy ramp, the polarization lifetime at store and, for heavy ions, the dynamic aperture. An algorithm to correct global coupling and dispersion simultaneously using existing skew quadrupoles was developed. Measured coupling and dispersion functions acquired before and after correction are presented.

Liu C.; Luo, Y.; Marusic, A.; Minty, M.

2012-05-20T23:59:59.000Z

285

The space of stability conditions for quivers with two vertices.  

E-Print Network (OSTI)

The purpose of this article is to study the space of stability conditions $\\stab(P_n)$ on the bounded derived category $\\D^b(P_n)$ of finite dimensional representations of a quiver $P_n$ with two vertices and $n$ parallel arrows. There is a local homeomorphism $\\z:\\stab(P_n)\\rightarrow\\C^2$. We show that, when the number of arrows is one or two, the map is a covering map if we restrict it to the complement of a line arrangement. When the number of arrows is greater than two we need to remove uncountably many lines to obtain a covering map.

Takahisa Shiina

286

Torque ripple in a Darrieus, vertical axis wind turbine  

DOE Green Energy (OSTI)

Interaction between a steady wind and a rotating, Darrieus, vertical axis wind turbine produces time periodic aerodynamic loads which cause time dependent torque variations, referred to as torque ripple, to occur in the mechanical link between the turbine and the electrical generator. There is concern for the effect of torque ripple upon fatigue life of drive train components and upon power quality. An analytical solution characterizing the phenomenon of torque ripple has been obtained which is based upon a Fourier expansion of the time dependent features of the problem. Numerical results for torque ripple, some experimental data, determination of acceptable levels and methods of controlling it, are presented and discussed.

Reuter, R.C. Jr.

1980-01-01T23:59:59.000Z

287

Control system for a vertical-axis windmill  

DOE Patents (OSTI)

A vertical-axis windmill having a rotating structure is provided with a series of articulated vertical blades whose positions are controlled to maintain a constant RPM for the rotating structure, when wind speed is sufficient. A microprocessor controller is used to process information on wind speed, wind direction and RPM of the rotating structure to develop an electrical signal for establishing blade position. The preferred embodiment of the invention, when connected to a utility grid, is designed to generate 40 kilowatts of power when exposed to a 20 mile per hour wind. The control system for the windmill includes electrical blade actuators that modulate the blades of the rotating structure. Blade modulation controls the blade angle of attack, which in turn controls the RPM of the rotor. In the preferred embodiment, the microprocessor controller provides the operation logic and control functions. A wind speed sensor provides inputs to start or stop the windmill, and a wind direction sensor is used to keep the blade flip region at 90 and 270/sup 0/ to the wind. The control system is designed to maintain constant rotor RPM when wind speed is between 10 and 40 miles per hour.

Brulle, R.V.

1981-09-03T23:59:59.000Z

288

Thrust stand for vertically oriented electric propulsion performance evaluation  

Science Conference Proceedings (OSTI)

A variation of a hanging pendulum thrust stand capable of measuring the performance of an electric thruster operating in the vertical orientation is presented. The vertical orientation of the thruster dictates that the thruster must be horizontally offset from the pendulum pivot arm, necessitating the use of a counterweight system to provide a neutrally stable system. Motion of the pendulum arm is transferred through a balance mechanism to a secondary arm on which deflection is measured. A noncontact light-based transducer is used to measure displacement of the secondary beam. The members experience very little friction, rotating on twisting torsional pivots with oscillatory motion attenuated by a passive, eddy-current damper. Displacement is calibrated using an in situ thrust calibration system. Thermal management and self-leveling systems are incorporated to mitigate thermal and mechanical drifts. Gravitational force and torsional spring constants associated with flexure pivots provide restoring moments. An analysis of the design indicates that the thrust measurement range spans roughly four decades, with the stand capable of measuring thrust up to 12 N for a 200 kg thruster and up to approximately 800 mN for a 10 kg thruster. Data obtained from calibration tests performed using a 26.8 lbm simulated thruster indicated a resolution of 1 mN on 100 mN level thrusts, while those tests conducted on a 200 lbm thruster yielded a resolution of roughly 2.5 mN at thrust levels of 0.5 N and greater.

Moeller, Trevor [University of Tennessee Space Institute, Tullahoma, Tennessee 37388 (United States); Polzin, Kurt A. [NASA, Marshall Space Flight Center, Huntsville, Alabama 35812 (United States)

2010-11-15T23:59:59.000Z

289

Precipitation Identification from Radar Wind Profiler Spectral Moment Data: Vertical Velocity Histograms, Velocity Variance, and Signal Power–Vertical Velocity Correlations  

Science Conference Proceedings (OSTI)

Correlations between range-corrected signal power Src and radial vertical velocity Vr, from the vertical beam of a UHF wind profiler can be used to distinguish between air- and precipitation-dominated echoes using an Src–Vr correlation diagram. ...

F. Martin Ralph; Paul J. Neiman; Dominique Ruffieux

1996-06-01T23:59:59.000Z

290

Consumer behaviour at multi-channel retailers  

E-Print Network (OSTI)

Consumer behaviour at pure Internet players has been analysed thoroughly in earlier work. When it comes to retailers with multiple distribution channels, however, new behaviour patterns can be observed. Given the fact that multi-channel retailing is much more common than Internet-only, the analysis of consumer behaviour in a multi-channel context constitutes a challenge for the deeper understanding of e-business. The contribution of this research is threefold: first, this study provides an overview of how the 50 largest e-retailers presently coordinate the interaction between sales on their web sites and in physical stores. Second, we present findings from a consumer survey suggesting what consumers like about multi-channel services on retail sites. Finally, user behaviour is empirically evaluated based on transaction and web log data from a large multi-channel retailer. The results indicate a strong demand for multi-channel services and suggest that retailers should expand their multi-channel service spectrum.

Maximilian Teltzrow; Bettina Berendt; Oliver Günther

2003-01-01T23:59:59.000Z

291

TWO-CHANNEL DIELECTRIC WAKE FIELD ACCELERATOR  

SciTech Connect

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.

Jay L. Hirshfield

2012-05-30T23:59:59.000Z

292

Complete Muon Cooling Channel Design and Simulations  

Science Conference Proceedings (OSTI)

Considerable progress has been made in developing promising subsystems for muon beam cooling channels to provide the extraordinary reduction of emittances required for an energy-frontier muon collider. However, it has not yet been demonstrated that the various proposed cooling subsystems can be consolidated into an integrated end-to-end design. Presented here are concepts to address the matching of transverse emittances between subsystems through an extension of the theoretical framework of the Helical Cooling Channel (HCC), which allows a general analytical approach to guide the transition from one set of cooling channel parameters to another.

Neuffer, D.V.; /Fermilab; Ankenbrandt, C.M.; Johnson, R.P.; Yoshikawa, C.Y.; /MUONS Inc., Batavia; Derbenev, Y.S.; Morozov, V.S.; /Jefferson Lab

2012-05-01T23:59:59.000Z

293

Complete Muon Cooling Channel Design and Simulations  

SciTech Connect

Considerable progress has been made in developing promising subsystems for muon beam cooling channels to provide the extraordinary reduction of emittances required for an energy-frontier muon collider. However, it has not yet been demonstrated that the various proposed cooling subsystems can be consolidated into an integrated end-to-end design. Presented here are concepts to address the matching of transverse emittances between subsystems through an extension of the theoretical framework of the Helical Cooling Channel (HCC), which allows a general analytical approach to guide the transition from one set of cooling channel parameters to another.

C. Y. Yoshikawa, C.M. Ankenbrandt, R.P. Johnson, Y.S. Derbenev, V.S. Morozov, D.V. Neuffer, K. Yonehara

2012-07-01T23:59:59.000Z

294

Quantum Communication With Zero-Capacity Channels  

E-Print Network (OSTI)

Communication over a noisy quantum channel introduces errors in the transmission that must be corrected. A fundamental bound on quantum error correction is the quantum capacity, which quantifies the amount of quantum data that can be protected. We show theoretically that two quantum channels, each with a transmission capacity of zero, can have a nonzero capacity when used together. This unveils a rich structure in the theory of quantum communications, implying that the quantum capacity does not uniquely specify a channel's ability for transmitting quantum information.

Graeme Smith; Jon Yard

2008-07-30T23:59:59.000Z

295

Image Source Separation Using Color Channel Dependencies  

Science Conference Proceedings (OSTI)

We investigate the problem of source separation in images in the Bayesian framework using the color channel dependencies. As a case in point we consider the source separation of color images which have dependence between its components. A Markov Random ...

Koray Kayabol; Ercan E. Kuruoglu; Bulent Sankur

2009-03-01T23:59:59.000Z

296

Scripps Channel 1 | Open Energy Information  

Open Energy Info (EERE)

Scripps Channel 1 Scripps Channel 1 Jump to: navigation, search Basic Specifications Facility Name Scripps Channel 1 Overseeing Organization University of California, San Diego (Scripps) Hydrodynamic Testing Facility Type Channel Length(m) 44.5 Beam(m) 2.4 Depth(m) 2.4 Cost(per day) Contact POC Special Physical Features Strategically placed windows, longest being 5.5m, allow optical access from side Towing Capabilities Towing Capabilities Yes Maximum Velocity(m/s) 2 Length of Effective Tow(m) 7.0 Wavemaking Capabilities Wavemaking Capabilities Yes Maximum Wave Height(m) 0.6 Maximum Wave Height(m) at Wave Period(s) 10.0 Wave Period Range(s) 10.0 Current Velocity Range(m/s) 0.0 Programmable Wavemaking Yes Wavemaking Description Function Generator or user provided Wave Direction Uni-Directional

297

Scripps Channel 2 | Open Energy Information  

Open Energy Info (EERE)

Channel 2 Channel 2 Jump to: navigation, search Basic Specifications Facility Name Scripps Channel 2 Overseeing Organization University of California, San Diego (Scripps) Hydrodynamic Testing Facility Type Channel Length(m) 33.0 Beam(m) 0.5 Depth(m) 0.5 Cost(per day) Contact POC Special Physical Features All side walls and 11m of the tank bottom are glass to provide optical access. Towing Capabilities Towing Capabilities Yes Maximum Velocity(m/s) 0.7 Length of Effective Tow(m) 20.0 Wavemaking Capabilities Wavemaking Capabilities Yes Maximum Wave Height(m) 0.3 Maximum Wave Height(m) at Wave Period(s) 10.0 Wave Period Range(s) 0.0 Current Velocity Range(m/s) 0.0 Programmable Wavemaking Yes Wavemaking Description Function Generator or user provided Wave Direction Uni-Directional

298

Vicarious Calibration of the Meteosat Visible Channel  

Science Conference Proceedings (OSTI)

Postlaunch calibration of the Meteosat visible (VIS) channel has been performed with Meteosat-1, Meteosat-2, and Meteosat-4. The radiance at the satellite radiometer aperture has been determined by independent means and has been related to the ...

Karl-Theodor Kriebel; Volker Amann

1993-04-01T23:59:59.000Z

299

On concepts of performance parameters for channels  

Science Conference Proceedings (OSTI)

Among the mostly investigated parameters for noisy channels are code size, error probability in decoding, block length; rate, capacity, reliability function; delay, complexity of coding. There are several statements about connections between these quantities. ...

R. Ahlswede

2006-01-01T23:59:59.000Z

300

Fair resource allocation in multiple access channels  

E-Print Network (OSTI)

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 ...

ParandehGheibi, Ali

2008-01-01T23:59:59.000Z

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


301

Channel capacities via $p$-summing norms  

E-Print Network (OSTI)

In this paper we show how \\emph{the metric theory of tensor products} developed by Grothendieck perfectly fits in the study of channel capacities, a central topic in \\emph{Shannon's information theory}. Furthermore, in the last years Shannon's theory has been generalized to the quantum setting to let the \\emph{quantum information theory} step in. In this paper we consider the classical capacity of quantum channels with restricted assisted entanglement. In particular these capacities include the classical capacity and the unlimited entanglement-assisted classical capacity of a quantum channel. To deal with the quantum case we will use the noncommutative version of $p$-summing maps. More precisely, we prove that the (product state) classical capacity of a quantum channel with restricted assisted entanglement can be expressed as the derivative of a completely $p$-summing norm.

Marius Junge; Carlos palazuelos

2013-05-05T23:59:59.000Z

302

Turbulent Channel Flows on a Rotating Earth  

Science Conference Proceedings (OSTI)

This paper deals with flow in a rectilinear channel on a rotating earth. The flow is directed perpendicular to the background planetary vorticity; both an analytical theory and numerical simulations are employed. The analytical approach assumes ...

Robert A. Handler; Richard P. Mied; Gloria J. Lindemann; Thomas E. Evans

2009-04-01T23:59:59.000Z

303

Multi-channel neutral analyzer-system  

DOE Green Energy (OSTI)

Design and calibration of a 15 channel multi-channel analyzer for analysis of energetic neutral particles escaping a hot plasma are discussed. Features of the analyzer include a frequency response from DC to 50 kHz, spatial resolution, mass resolution, and data acquisition and processing for 15 points on the energy distribution that are simultaneously recorded. Another feature of the system is the ability to radially scan the plasma. An rf ion source is used to provide ions and neutrals used for calibration of a reference single channel analyzer. This analyzer is, in turn, used to calibrate the multi-channel analyzer over the energy range 500 eV to 40 keV. A brief description of the data processing system is included. (RME)

Nexsen, Jr., W. E.; Turner, W. C.; Cummins, W. F.

1977-09-14T23:59:59.000Z

304

Message passing with queues and channels  

Science Conference Proceedings (OSTI)

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.

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

2013-09-24T23:59:59.000Z

305

On the capacity of bosonic channels  

E-Print Network (OSTI)

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 ...

Blake, Christopher Graham

2011-01-01T23:59:59.000Z

306

Entanglement transmission and generation under channel uncertainty: Universal quantum channel coding  

E-Print Network (OSTI)

We determine the optimal rates of universal quantum codes for entanglement transmission and generation under channel uncertainty. In the simplest scenario the sender and receiver are provided merely with the information that the channel they use belongs to a given set of channels, so that they are forced to use quantum codes that are reliable for the whole set of channels. This is precisely the quantum analog of the compound channel coding problem. We determine the entanglement transmission and entanglement-generating capacities of compound quantum channels and show that they are equal. Moreover, we investigate two variants of that basic scenario, namely the cases of informed decoder or informed encoder, and derive corresponding capacity results.

I. Bjelakovic; H. Boche; J. Noetzel

2008-11-27T23:59:59.000Z

307

Angle of crack propagation for a vertical hydraulic fracture  

DOE Green Energy (OSTI)

Using the strain-energy-density-factor (S) theory, the positive fracture angle +theta/sub o/ (the initial fracture angle of crack propagation) of a near-vertical crack is predicted by using the opening- and sliding-mode stress-intensity factors in the presence of the overburden pressure, the least in situ horizontal principal stress, and the borehole fluid pressure. The crack spreads in the positive theta/sub o/ direction (counter-clockwise) in the plane for which S is a minimum, S/sub min/. It was verified that S/sub min/ is greater than or equal to S/sub c/. The quantity S/sub c/ is defined as the critical value of S, and remains essentially constant. Of interest is the numerical example for calculating fracture angle and the critical uniform borehole fluid pressure required to initiate fracture at such an angle for the present LASL Dry Hot Rock Geothermal Energy Program. (auth)

Sarda, J.P.; Hsu, Y.C.

1975-12-01T23:59:59.000Z

308

Instrument Development Tethered Balloon Sounding System for Vertical Radiation Profiles  

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

Tethered Balloon Sounding System Tethered Balloon Sounding System for Vertical Radiation Profiles C. D. Whiteman J. M. Alzheimer G. A. Anderson M. R. Garnich W. J. Shaw Pacific Northwest Laboratory Richland, WA 99352 platform is built on a triangular frame identical to the one on the Sky Platform, but the MSP carries no radiometric sensors, control loop, or leveling motors. Rather. the MSP is instrumented to measure the motions to which the Sky Platform will be subjected; the data provide engineering information to be used in the final design of the control loop and structural elements of the Sky Platform. An array of six miniature solid state accelerometers provides the raw data from which balloon motions are determined. Future plans call for the installation of a small attitude gyroscope on the

309

Natural convection in a vertical enclosure with internal permeable screen  

SciTech Connect

This paper documents the thermal insulation effect of a screen installed inside a vertical rectangular enclosure (e.g., double-glazed window). The screen is a venetian blind system made out of horizontal strips that can be rotated. The focus is on the closed position, where the strips almost touch. The effect of this permeable screen on the temperature field, the flow field, and the overall heat transfer rate is determined numerically. The study shows that there exists a ceiling (critical) conductance for the air leakage through the screen, above which the screen does not cause a significant drop in the overall heat transfer rate. A numerical example shows how this critical conductance can be used to calculate the critical spacing that can be tolerated between two consecutive strips in the screen.

Zhang, Z.; Bejan, A.; Lage, J.L. (Duke Univ., Durham, NC (USA))

1991-05-01T23:59:59.000Z

310

The ATLAS Muon Trigger vertical slice at LHC startup  

E-Print Network (OSTI)

The ATLAS trigger system has a three-levels structure, implemented to retain interesting physics events, here described for the muon case ("Muon Vertical Slice"). The first level, implemented in a custom hardware, uses measurements from the trigger chambers of the Muon Spectrometer to select muons with high transverse momentum and defines a Region of Interest (RoI) in the detector. RoIs are then processed by a second trigger level, in which fast algorithms run on an online software architecture. Full granularity information from precision chambers is accessed inside RoIs. A third trigger level (Event Filter), using offline-like algorithms and accessing the full event, provide the best possible muon reconstruction/identification and finally confirm or discard the trigger hypothesis formed at earlier levels. Implementation and performance of the full muon trigger slice, together with first events triggered with LHC beams on, are presented.

Grancagnolo, Sergio

2009-01-01T23:59:59.000Z

311

Vertical arrays for fracture mapping in geothermal systems  

DOE Green Energy (OSTI)

In collaboration with UNOCAL Geothermal Operations, Los Alamos National Laboratory assessed the feasibility of using vertical arrays of borehole seismic sensors for mapping of microseismicity in The Geysers geothermal field. Seismicity which arises from minute displacements along fracture or fault surfaces has been shown in studies of seismically active oil reservoirs to be useful in identifying fractures affected by and possibly contributing to production. Use of retrievable borehole seismic packages at The Geysers was found to reduce the threshold for detection of microearthquakes by an estimated 2--3 orders of magnitude in comparison to surface-based sensors. These studies led to the design, materials selection, fabrication, and installation of a permanent array of geophones intended for long term seismic monitoring and mapping of fractures in the vicinity of the array at The Geysers.

Albright, J.N. [Los Alamos National Lab., NM (United States); Rutledge, J.T.; Fairbanks, T.D. [Nambe Geophysics, Inc. (United States); Thomson, J.C. [Lithos Inc. (United States); Stevenson, M.A. [Petroleum Geo-Services (United States)

1998-12-01T23:59:59.000Z

312

On Entropy Transmission for Quantum Channels  

E-Print Network (OSTI)

In this paper a notion of entropy transmission of quantum channels is introduced as a natural extension of Ohya's entropy. Here by quantum channel is meant unital completely positive mappings (ucp) of $B(H)$ into itself, where $H$ is an infinite dimensional Hilbert space. Using a representation theorem of ucp mapping we associate to every ucp map a uniquely determined state, and prove that entropy of ucp map is less then Ohya's entropy of the associated state.

Nasir Ganikhodjaev; Farrukh Mukhamedov

2007-03-26T23:59:59.000Z

313

Quantum capacity of channel with thermal noise  

E-Print Network (OSTI)

The quantum capacity of thermal noise channel is studied. The extremal input state is obtained at the postulation that the coherent information is convex or concave at its vicinity. When the input energy tends to infinitive, it is verified by perturbation theory that the coherent information reaches its maximum at the product of identical thermal state input. The quantum capacity is obtained for lower noise channel and it is equal the one shot capacity.

Xiao-yu Chen

2006-02-11T23:59:59.000Z

314

Simulation of anisotropic wave propagation in Vertical Seismic Profiles  

E-Print Network (OSTI)

The influence of elastic anisotropy on seismic wave propagation is often neglected for the sake of simplicity. However, ignoring anisotropy may lead to significant errors in the processing of seismic data and ultimately in a poor image of the subsurface. This is especially true in wide-aperture Vertical Seismic Profiles where waves travel both vertically and horizontally. Anisotropy has been neglected in wavefront construction methods of seismic ray-tracing until Gibson (2000), who showed they are powerful tools to simulate seismic wave propagation in three-dimensional anisotropic subsurface models. The code is currently under development using a C++ object oriented programming approach because it provides high flexibility in the design of new components and facilitates debugging and maintenance of a complex algorithm. So far, the code was used to simulate propagation in homogeneous or simple heterogeneous anisotropic velocity models mainly designed for testing purposes. In particular, it has never been applied to simulate a field dataset. We propose here an analytical method involving little algebra and that allows the design of realistic heterogeneous anisotropic models using the C++ object oriented programming approach. The new model class can model smooth multi-layered subsurface with gradients or models with many dip variations. It has been used to model first arrival times of a wide-aperture VSP dataset from the Gulf of Mexico to estimate the amount of anisotropy. The proposed velocity model is transversely isotropic. The anisotropy is constant throughout the model and is defined via Thomsen's parameters. Values in the final model are epsilon = 0.055 and delta = -0.115. The model is compatible with the a priori knowledge of the local geology and reduces the RMS average time difference between measured and computed travel times by 51% in comparison to the initial isotropic model. These values are realistic and are similar to other measurements of anisotropy in the Gulf of Mexico.

Durussel, Vincent Bernard

2002-08-01T23:59:59.000Z

315

Photon Bubbles and the Vertical Structure of Accretion Disks  

E-Print Network (OSTI)

We consider the effects of "photon bubble" shock trains on the vertical structure of radiation pressure-dominated accretion disks. These density inhomogeneities are expected to develop spontaneously in radiation-dominated accretion disks where magnetic pressure exceeds gas pressure, even in the presence of magnetorotational instability. They increase the rate at which radiation escapes from the disk, and may allow disks to exceed the Eddington limit by a substantial factor. We first generalize the theory of photon bubbles to include the effects of finite optical depths and radiation damping. Modifications to the diffusion law at low optical depth tend to fill in the low-density regions of photon bubbles, while radiation damping inhibits the formation of photon bubbles at large radii, small accretion rates, and small heights above the equatorial plane. Accretion disks dominated by photon bubble transport may reach luminosities of 10 to >100 times the Eddington limit (L_E), depending on the mass of the central object, while remaining geometrically thin. However, photon bubble-dominated disks with alpha-viscosity are subject to the same thermal and viscous instabilities that plague standard radiation pressure-dominated disks, suggesting that they may be intrinsically unsteady. Photon bubbles can lead to a "core-halo" vertical disk structure. In super-Eddington disks the halo forms the base of a wind, which carries away substantial energy and mass, but not enough to prevent the luminosity from exceeding L_E. Photon bubble-dominated disks may have smaller color corrections than standard accretion disks of the same luminosity. They remain viable contenders for some ultraluminous X-ray sources and may play a role in the rapid growth of supermassive black holes at high redshift.

Mitchell C. Begelman

2006-02-01T23:59:59.000Z

316

The canonical transformation and massive CSW vertices for MHV-SQCD  

E-Print Network (OSTI)

The similarity of massive CSW scalar vertices and quark vertices can be understood using a kind of light-cone SUSY transformation presented in this paper. We also show that the canonical transformation generating the MHV-SQCD lagrangian, can be fixed by applying this light-cone SUSY transformation to the canonical transformation for MHV-QCD obtained in paper arxiv:0805.0239. Most of the massive CSW vertices for SQCD can also be pinned down in this way.

Tim R. Morris; Zhiguang Xiao

2008-10-21T23:59:59.000Z

317

The Influence of Aerodynamic Stall on the Performance of Vertical Axis Wind Turbines.  

E-Print Network (OSTI)

??There is currently an increasing desire for local small-scale sustainable energy generation. This has lead to increased interest in the concept of the vertical axis… (more)

Edwards, Jonathan

2012-01-01T23:59:59.000Z

318

Mesh Requirement Investigation for 2D and 3D Aerodynamic Simulation of Vertical Axis Wind Turbines.  

E-Print Network (OSTI)

??The accuracy of a Computational Fluid Dynamics (CFD) model to capture the complex flow around a small vertical axis wind turbine (VAWT) on 2D and… (more)

Naghib Zadeh, Saman

2013-01-01T23:59:59.000Z

319

Characterization of the Ground Thermal Response to Heating by a Deep Vertical Borehole Heat Exchanger.  

E-Print Network (OSTI)

??This thesis presents an experiment and an analysis that evaluates some of the long-standing assumptions in deep vertical borehole ground heat exchanger (GHX) theory. These… (more)

Olfman, Maeir Zalman

2012-01-01T23:59:59.000Z

320

Power in the Vertical: Using Wind Profiler Data to Study Precipitation  

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

in the Vertical: Using Wind Profiler Data to Study Precipitation For original submission and image(s), see ARM Research Highlights http:www.arm.govsciencehighlights Research...

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


321

Ushering Buyers into Electronic Channels: An Empirical Analysis  

Science Conference Proceedings (OSTI)

Despite many success stories, B2B e-commerce penetration remains low. Many firms introduce electronic channels in addition to their traditional sales channels but find that buyer usage of the e-channel over time does not keep up with initial expectations. ... Keywords: buyer heterogeneity, channel choice, electronic markets

Nishtha Langer; Chris Forman; Sunder Kekre; Baohong Sun

2012-12-01T23:59:59.000Z

322

Thermal strains in focusing channels of the stations for X-ray diffraction analysis in the Sibir-2 storage ring  

SciTech Connect

The thermal load caused by the absorption of synchrotron radiation in X-ray optical elements of the Belok and RSA stations leads to optics elements heating and induces strains upon simultaneous cooling. The heating of the cooled first crystal in the double-crystal monochromator causes its bending and increases the reflected beam divergence, which, in turn, results in the monochromatic beam intensity loss [1]. Numerical simulation makes it possible to more accurately determine the strains, choose the optimal monochromator design, estimate the vertical sizes of the focal spot and wavelength resolution in the focusing channel, correctly design the system for cooling the mirror at the channel input, and choose a design providing the minimum temperature of the beam-limiting slit knives.

Kheiker, D. M., E-mail: kheiker@ns.crys.ras.ru [Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation); Konoplev, E. E. [NPO Luch (Russian Federation); Molodenskii, D. S.; Shishkov, V. A.; Dorovatovskii, P. V. [Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation)

2010-09-15T23:59:59.000Z

323

Channel Selection in Multi-channel Opportunistic Spectrum Access Networks with  

E-Print Network (OSTI)

Channel Selection in Multi-channel Opportunistic Spectrum Access Networks with Perfect Sensing Xin and utilized by primary users (PU). In dynamic spectrum access networks, the protection of PU's is vital, since no PU would accommo- date SU access to its own detriment. Therefore the objective of the problem we

Liu, Xin

324

Coupled-channel continuum eigenchannel basis  

E-Print Network (OSTI)

The goal of this paper is to calculate bound, resonant and scattering states in the coupled-channel formalism without relying on the boundary conditions at large distances. The coupled-channel solution is expanded in eigenchannel bases i.e. in eigenfunctions of diagonal Hamiltonians. Each eigenchannel basis may includes discrete and discretized continuum (real or complex energy) single particle states. The coupled-channel solutions are computed through diagonalization in these bases. The method is applied to a few two-channel problems. The exact bound spectrum of the Poeschl-Teller potential is well described by a basis of real energy continuum states. For the deuteron with the Reid potential the experimental energy and the $S$ and $D$ wave functions content are reproduced in the asymptotic limit of the energy cutoff. For the Noro-Taylor potential, beside the exact bound state energies the resonant state energy is also well reproduced by using the complex energy Berggren basis. It is found that the expansion of the coupled-channel wave functions in these eigenchannel bases require less computational effort than the use of any other basis. The solutions are stable and converge as the energy cutoff increases.

R. M. Id Betan

2013-11-18T23:59:59.000Z

325

On the heat channel and its capacity  

E-Print Network (OSTI)

The heat channel is defined by an analog filter and a subsequent inaccurate measurement of the filter output signal. The filter is related to the solution of the heat equation and to the heat kernel of the quantum mechanical harmonic oscillator, so the name of the channel. The channel is modeled as an infinite-dimensional vector Gaussian channel and the capacity in terms of average energy of the input signal is derived. The relation to rate distortion theory is investigated by calculating the rate distortion function of a closely connected Gaussian process. An application to optical fiber communication is given. Characterizations of the capacity/rate distortion function by water-filling/reverse water-filling in the time-frequency plane are stated and proved. Finally, a second formula for the capacity of the heat channel based on average energy of the measured filter output signal is derived. The result is interpreted in context of estimation theory and a parallel to a famous formula connecting mutual informat...

Hammerich, Edwin

2011-01-01T23:59:59.000Z

326

Poly(ethylene glycol)-based open-channel blockers for the acetylcholine receptor : mechanistic and structure-function studies at the single-channel level  

E-Print Network (OSTI)

Ion channels are essential mediators in nervous signaling pathways. Because hyperactivation of ion channels can lead to pathological disorders such as congenital myasthenic syndromes and neurodegeneration, channel inhibitors ...

Lin, Wan-Chen, Ph. D. Massachusetts Institute of Technology

2009-01-01T23:59:59.000Z

327

Visible light emitting vertical cavity surface emitting lasers  

DOE Patents (OSTI)

A vertical cavity surface emitting laser that emits visible radiation is built upon a substrate, then having mirrors, the first mirror on top of the substrate; both sets of mirrors being a distributed Bragg reflector of either dielectrics or other materials which affect the resistivity or of semiconductors, such that the structure within the mirror comprises a plurality of sets, each having a thickness of {lambda}/2n where n is the index of refraction of each of the sets; each of the mirrors adjacent to spacers which are on either side of an optically active bulk or quantum well layer; and the spacers and the optically active layer are from one of the following material systems: In{sub z}(Al{sub y}Ga{sub 1{minus}y}){sub 1{minus}z}P, InAlGaAs, AlGaAs, InGaAs, or AlGaP/GaP, wherein the optically active region having a length equal to m {lambda}/2n{sub eff} where m is an integer and n{sub eff} is the effective index of refraction of the laser cavity, and the spacer layer and one of the mirrors being transmissive to radiation having a wavelength of {lambda}/n, typically within the green to red portion of the visible spectrum. 10 figs.

Bryan, R.P.; Olbright, G.R.; Lott, J.A.; Schneider, R.P. Jr.

1995-06-27T23:59:59.000Z

328

Advance in Vertical Buffered Electropolishing on Niobium for Particle Accelerators*  

Science Conference Proceedings (OSTI)

Niobium (Nb) is the most popular material that has been employed for making superconducting radio frequency (SRF) cavities to be used in various particle accelerators over the last couple of decades. One of the most important steps in fabricating Nb SRF cavities is the final chemical removal of 150 {mu}m of Nb from the inner surfaces of the SRF cavities. This is usually done by either buffered chemical polishing (BCP) or electropolishing (EP). Recently a new Nb surface treatment technique called buffered electropolishing (BEP) has been developed at Jefferson Lab. It has been demonstrated that BEP can produce the smoothest surface finish on Nb ever reported in the literature while realizing a Nb removal rate as high as 10 {mu}m/min that is more than 25 and 5 times quicker than those of EP and BCP(112) respectively. In this contribution, recent advance in optimizing and understanding BEP treatment technique is reviewed. Latest results from RF measurements on BEP treated Nb single cell cavities by our unique vertical polishing system will be reported.

A.T. Wu, S. Jin, J.D. Mammosser, C.E. Reece, R.A. Rimmer,L. Lin, X.Y. Lu, K. Zhao

2011-09-01T23:59:59.000Z

329

Axisymmetric Simulations of the ITER Vertical Stability Coil  

SciTech Connect

The ITER in-vessel coil system includes Vertical Stability (VS) coils and Edge Localized Mode (ELM) coils. There are two large VS ring coils, one upper and one lower. Each has four turns which are independently connected. The VS coils are needed for successful operation of ITER for most all of its operating modes. The VS coils must be highly reliable and fault tolerant. The operating environment includes normal and disruption Lorentz forces. To parametrically address all these design conditions in a tractable analysis requires a simplified model. The VS coils are predominately axisymmetric, and this suggests that an axisymmetric model can be meaningfully used to address the variations in mechanical design, loading, material properties, and time dependency. The axisymmetric finite element analysis described in this paper includes simulations of the bolted frictional connections used for the mounting details. Radiation and elastic-plastic response are modeled particularly for the extreme faulted conditions. Thermal connectivity is varied to study the effects of partial thermal connection of the actively cooled conductor to the remaining structure.

Titus, Peter H.

2013-07-09T23:59:59.000Z

330

Characterization of secondary phases in modified vertical bridgman growth czt  

Science Conference Proceedings (OSTI)

CdZnTe or 'CZT' crystals are highly suitable for use as a room temperature based spectrometer for the detection and characterization of gamma radiation. Over the last decade, the methods for growing high quality CZT have improved the quality of the produced crystals however there are material features that can influence the performance of these materials as radiation detectors. For example, various structural heterogeneities within the CZT crystals, such as twinning, pipes, grain boundaries (polycrystallinity), and secondary phases (SP) can have a negative impact on the detector performance. In this study, a CZT material was grown by the modified vertical Bridgman growth (MVB) method with zone leveled growth without excess Te in the melt. Visual observations of material from the growth of this material revealed significant voids and SP. Three samples from this material was analyzed using various analytical techniques to evaluate its electrical properties, purity and detector performance as radiation spectrometers and to determine the morphology, dimension and elemental/structural composition of one of the SP in this material. This material was found to have a high resistivity but poor radiation spectrometer performance. It had SP that were rich in polycrystalline aluminum oxide (Al{sub 2}O{sub 3}), metallic Te and polycrystalline CdZnTe and 15 to 50 {micro}m in diameter. Bulk elemental analyses of sister material from elsewhere in the boule did not contain high levels of Al so there is considerable elemental impurity heterogeneity within the boule from this growth.

Duff, Martine

2009-07-10T23:59:59.000Z

331

Peter Agre and Aquaporin Water Channels  

Office of Scientific and Technical Information (OSTI)

Peter Agre and Aquaporin Water Channels Peter Agre and Aquaporin Water Channels Resources with Additional Information Peter Agre Courtesy of Johns Hopkins University 'Peter Agre, MD received the Nobel Prize in Chemistry in 2003 for his work with aquaporins, a family of water channel proteins found throughout nature and responsible for numerous physiological processes in humans.'1 'Dr. Agre received his BA in chemistry from Augsburg College in 1970, and his MD from Johns Hopkins in 1974. Following an Internal Medicine Residency at Case Western Reserve University Hospitals of Cleveland and a Hematology-Oncology Fellowship at the University of North Carolina at Chapel Hill, Dr. Agre returned to Johns Hopkins as a postdoctoral fellow in cell biology. Dr. Agre joined the faculty in 1984 and has spent most of his professional life at Hopkins' School of Medicine, leaving in 2005 to go to become Vice Chancellor for Science and Technology at Duke University Medical Center.'2

332

Plasma channel optical pumping device and method  

SciTech Connect

A device and method for optically pumping a gaseous laser using blackbody radiation produced by a plasma channel which is formed from an electrical discharge between two electrodes spaced at opposite longitudinal ends of the laser. A preionization device which can comprise a laser or electron beam accelerator produces a preionization beam which is sufficient to cause an electrical discharge between the electrodes to initiate the plasma channel along the preionization path. The optical pumping energy is supplied by a high voltage power supply rather than by the preionization beam. High output optical intensities are produced by the laser due to the high temperature blackbody radiation produced by the plasma channel, in the same manner as an exploding wire type laser. However, unlike the exploding wire type laser, the disclosed invention can be operated in a repetitive manner by utilizing a repetitive pulsed preionization device.

Judd, O' Dean P. (Los Alamos, NM)

1983-06-28T23:59:59.000Z

333

Truncated channel representations for coupled harmonic oscillators  

E-Print Network (OSTI)

Coupled quantum harmonic oscillators, studied by many authors using many different techniques over the decades, are frequently used toy-models to study open quantum systems. In this manuscript, we explicitly study the simplest oscillator model -- a pair of initially decoupled quantum harmonic oscillators interacting with a spring-like coupling, where the bath oscillator is initially in a thermal-like state. In particular, we treat the completely positive and trace preserving map on the system as a quantum channel, and study the truncation of the channel by truncating its Kraus set and its output dimension. We thereby derive the truncated transition amplitudes of the corresponding truncated channel. Finally, we give a computable approximation for these truncated transition amplitudes with explicit error bounds, and perform a case study of the oscillators in the off-resonant and weakly-coupled regime numerically. We demonstrate explicitly that the substantial leakage error can be mitigated via quantum error correction.

Yingkai Ouyang; Wee Hao Ng

2013-01-19T23:59:59.000Z

334

Notes on entropic characteristics of quantum channels  

E-Print Network (OSTI)

One of most important issues in quantum information theory concerns transmission of information through noisy quantum channels. We discuss few channel characteristics expressed by means of generalized entropies. Such characteristics can often be dealt in line with more usual treatment based on the von Neumann entropies. For any channel, we show that the $q$-average output entropy of degree $q\\geq1$ is bounded from above by the $q$-entropy of the input density matrix. Concavity properties of the $(q,s)$-entropy exchange are considered. Fano type quantum bounds on the $(q,s)$-entropy exchange are derived. We also give upper bounds on the map $(q,s)$-entropies in terms of the output entropy, corresponding to the completely mixed input.

Alexey E. Rastegin

2012-06-14T23:59:59.000Z

335

Channel simulation with quantum side information  

E-Print Network (OSTI)

We study and solve the problem of classical channel simulation with quantum side information at the receiver. This is a generalization of both the classical reverse Shannon theorem, and the classical-quantum Slepian-Wolf problem. The optimal noiseless communication rate is found to be reduced from the mutual information between the channel input and output by the Holevo information between the channel output and the quantum side information. Our main theorem has two important corollaries. The first is a quantum generalization of the Wyner-Ziv problem: rate-distortion theory with quantum side information. The second is an alternative proof of the trade-off between classical communication and common randomness distilled from a quantum state. The fully quantum generalization of the problem considered is quantum state redistribution. Here the sender and receiver share a mixed quantum state and the sender wants to transfer part of her state to the receiver using entanglement and quantum communication. We present o...

Luo, Z; Devetak, Igor; Luo, Zhicheng

2006-01-01T23:59:59.000Z

336

Minimum error discrimination of Pauli channels  

E-Print Network (OSTI)

We solve the problem of discriminating with minimum error probability two given Pauli channels. We show that, differently from the case of discrimination between unitary transformations, the use of entanglement with an ancillary system can strictly improve the discrimination, and any maximally entangled state allows to achieve the optimal discrimination. We also provide a simple necessary and sufficient condition in terms of the structure of the channels for which the ultimate minimum error probability can be achieved without entanglement assistance. When such a condition is satisfied, the optimal input state is simply an eigenstate of one of the Pauli matrices.

Massimiliano F. Sacchi

2005-06-09T23:59:59.000Z

337

ANN and ANFIS models for performance evaluation of a vertical ground source heat pump system  

Science Conference Proceedings (OSTI)

The aim of this study is to demonstrate the comparison of an artificial neural network (ANN) and an adaptive neuro-fuzzy inference system (ANFIS) for the prediction performance of a vertical ground source heat pump (VGSHP) system. The VGSHP system using ... Keywords: Adaptive neuro-fuzzy inference system, Coefficient of performance, Ground source heat pump, Membership functions, Vertical heat exchanger

Hikmet Esen; Mustafa Inalli

2010-12-01T23:59:59.000Z

338

Blade shape for a tropskien type of vertical-axis wind turbine  

SciTech Connect

The equations derived to define a troposkien (the shape a completely flexible cable assumes when it is spun at a constant angular velocity about a vertical axis to which its two ends are attached) are described. The implications of the solutions on the design of a vertical-axis wind turbine are discussed for cases where gravity is neglected.

Blackwell, B.F.; Reis, G.E.

1977-03-01T23:59:59.000Z

339

Response of a Vertical Axis Wind Turbine to Time Varying Wind Conditions found within the Urban  

E-Print Network (OSTI)

Response of a Vertical Axis Wind Turbine to Time Varying Wind Conditions found within the Urban, 2010 PP 389­401 389 ABSTRACT Experimental testing of a vertical axis wind turbine within the urban of the turbine. Temporal variation of the wind with respect to the direction and velocity fluctuations

Tullis, Stephen

340

Performance Testing of a Small Vertical-Axis Wind Turbine , S. Tullis2  

E-Print Network (OSTI)

Performance Testing of a Small Vertical-Axis Wind Turbine R. Bravo1 , S. Tullis2 , S. Ziada3 of electric production [1]. Although most performance testing for small-scale wind turbines is conducted vertical-axis wind turbines (VAWT) in urban settings, full-scale wind tunnel testing of a prototype 3.5 k

Tullis, Stephen

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


341

Visualization of Transient Natural Convection Heat Transfer from a Vertical Rectangular Fin  

Science Conference Proceedings (OSTI)

Experiments on thermal visualization of transient natural convection from short vertical rectangular fins were conducted using the technique of laser holographic interferometry. A sequence of infinite-fringe interferograms recorded for the heating regime ... Keywords: interferograms, laser holographic interferometry, thermal visualization, transient natural convection, vertical rectangular fins

K. C. Leong; T. C. Kooi

1998-12-01T23:59:59.000Z

342

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

E-Print Network (OSTI)

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

Al-Majed, Abdulaziz Abdullah

343

Sustainability of Vertical Standards Consortia as Communities of Practice: A Multilevel Framework  

Science Conference Proceedings (OSTI)

It is challenging for vertical standards consortia (VSCs) to succeed and thrive, since they need to serve heterogeneous members, their operations depend on members' voluntary contributions, and the social interactions within them can be complex to manage. ... Keywords: Community Of Practice, Resource-Based Model, Standards, Sustainability, Vertical Standards Consortia

Kexin Zhao; Sarah Khan; Mu Xia

2011-10-01T23:59:59.000Z

344

Design and Analysis of a Tool for Planning and Simulating Dynamic Vertical Transport  

Science Conference Proceedings (OSTI)

Nowadays, most of the main companies in the vertical transport industry are researching tools capable of providing support for the design process of elevator systems. Numerous decisions have to be taken to obtain an accurate, comfortable, and high-quality ... Keywords: Vertical transport, elevator, lift, simulation

Pablo Cortés; Jesús Muñuzuri; Luis Onieva

2006-04-01T23:59:59.000Z

345

Carbon nanotube vertical membranes for electrostatically actuated micro-electro-mechanical devices  

Science Conference Proceedings (OSTI)

In this work, we investigate vertically aligned carbon nanotube (CNT) membranes as building blocks to realize electrostatically actuated micro-electro-mechanical-systems (MEMS). The fabricated CNT dense arrays are grown on adjacent metal electrodes and ... Keywords: Capacitors, Carbon nanotube, MEMS, Membrane, NEMS, Vertically aligned

A. Arun; D. Acquaviva; M. Fernández-Bolaños; P. Salet; H. Le-Poche; P. Pantigny; T. Idda; A. M. Ionescu

2010-05-01T23:59:59.000Z

346

A survey of vertical handover decision algorithms in Fourth Generation heterogeneous wireless networks  

Science Conference Proceedings (OSTI)

Vertical handover decision (VHD) algorithms are essential components of the architecture of the forthcoming Fourth Generation (4G) heterogeneous wireless networks. These algorithms need to be designed to provide the required Quality of Service (QoS) ... Keywords: 4G, Fourth Generation, Vertical handover, Wireless networks

Xiaohuan Yan; Y. Ahmet ?ekercio?lu; Sathya Narayanan

2010-08-01T23:59:59.000Z

347

A Simple Technique for Simultaneous Suspension of Multiple Drops in a Small Vertical Wind Tunnel  

Science Conference Proceedings (OSTI)

A simple technique is described by which multiple millimeter-size water drops can be simultaneously suspended in an air stream above the test section of a 12 × 12 cm cross section of a vertical wind tunnel. Horizontal profiles of the vertical air ...

A. K. Kamra; D. V. Ahire

1985-09-01T23:59:59.000Z

348

An Integral Closure Model for the Vertical Turbulent Flux of a Scalar in a Mixed Layer  

Science Conference Proceedings (OSTI)

An integral closure model is proposed for the vertical turbulent transport of a scalar in a mixed layer. The flux divergences at a given level is related to a vertical integral of a weighting function multiplied by the difference between the ...

Brian H. Fiedler

1984-02-01T23:59:59.000Z

349

Using vertical aerial photography to estimate mass balance at a point  

E-Print Network (OSTI)

Using vertical aerial photography to estimate mass balance at a point L. A. RASMUSSEN 1 and R. M. KRIMMEL2 1 Geophysics Program, University of Washington, Seattle WA 98195, U.S.A. 2 US Geological Survey-94. Vertical aerial photography from late summer 1992, 1993, and 1994 is analyzed photogrammetrically to get

Rasmussen, L.A.

350

FITOVERT: A dynamic numerical model of subsurface vertical flow constructed wetlands  

Science Conference Proceedings (OSTI)

This paper introduces a mathematical model (FITOVERT) specifically developed to simulate the behaviour of vertical subsurface flow constructed wetlands (VSSF-CWs). One of the main goals of the development of FITOVERT was to keep the complexity of the ... Keywords: Constructed wetlands, Hydrodynamics, Modelling, Reactive transport, Unsaturated flow, Vertical subsurface flow

D. Giraldi; M. de Michieli Vitturi; R. Iannelli

2010-05-01T23:59:59.000Z

351

ARM - PI Product - Cloud-Scale Vertical Velocity and Turbulent Dissipation  

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

ProductsCloud-Scale Vertical Velocity and Turbulent ProductsCloud-Scale Vertical Velocity and Turbulent Dissipation Rate Retrievals Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send PI Product : Cloud-Scale Vertical Velocity and Turbulent Dissipation Rate Retrievals Site(s) NSA General Description Time-height fields of retrieved in-cloud vertical wind velocity and turbulent dissipation rate, both retrieved primarily from vertically-pointing, Ka-band cloud radar measurements. Files are available for manually-selected, stratiform, mixed-phase cloud cases observed at the North Slope of Alaska (NSA) site during periods covering the Mixed-Phase Arctic Cloud Experiment (MPACE, late September through early November 2004) and the Indirect and Semi-Direct Aerosol Campaign (ISDAC, April-early May

352

A General Method for Fatigue Analysis of Vertical Axis  

E-Print Network (OSTI)

The fatigue life of wind turbine blades that are exposed to the random loading environment of atmospheric winds is described with random data analysis procedures. The incident wind speed and the stresses caused by these winds are expressed in terms of probability density functions, while the fatigue life vs stress level relationship is treated deterministically. This approach uses a "damage density function" to express fatigue damage as a function of wind speed. By examining the constraints on the variables in the damage density expression, some generalizations of the wind turbine fatigue problem are obtained. The area under the damage density function is inversely related to total fatigue life. Therefore, an increase in fatigue life caused by restricted operation in certain wind regimes is readily visualized. An "on parameter", which is the percentage of total time at each wind speed that the turbine actually operates, is introduced for this purpose. An example calculation is presented using data acquired from the DOE 100-kW turbine program. *This work was performed at Sandia National Laboratories and was supported by the US Department of Energy under Contract Number DE-AC04-76DP00789. Acknowledgments The calculations required to produce the figures in this paper would not have been possible without the work of Jerry McNerney and Tim Leonard in developing the AUTOSYM computer simulation, The efforts of Nolan Clark and Ron Davis in collecting data for the DOE 100-kW turbine at the USDA station in Bushland, TX are greatly appreciated. of Vertical Axis Wind Turbine Blades

Paul S. Veers

1983-01-01T23:59:59.000Z

353

Transformer Recharging with Alpha Channeling in Tokamaks  

SciTech Connect

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. __________________________________________________

N.J. Fisch

2009-12-21T23:59:59.000Z

354

Fermi Liquid Instabilities in the Spin Channel  

SciTech Connect

We study the Fermi surface instabilities of the Pomeranchuk type in the spin triplet channel with high orbital partial waves (F{sub l}{sup a} (l > 0)). The ordered phases are classified into two classes, dubbed the {alpha} and {beta}-phases by analogy to the superfluid {sup 3}He-A and B-phases. The Fermi surfaces in the {alpha}-phases exhibit spontaneous anisotropic distortions, while those in the {beta}-phases remain circular or spherical with topologically non-trivial spin configurations in momentum space. In the {alpha}-phase, the Goldstone modes in the density channel exhibit anisotropic overdamping. The Goldstone modes in the spin channel have nearly isotropic underdamped dispersion relation at small propagating wavevectors. Due to the coupling to the Goldstone modes, the spin wave spectrum develops resonance peaks in both the {alpha} and {beta}-phases, which can be detected in inelastic neutron scattering experiments. In the p-wave channel {beta}-phase, a chiral ground state inhomogeneity is spontaneously generated due to a Lifshitz-like instability in the originally nonchiral systems. Possible experiments to detect these phases are discussed.

Wu, Congjun; /Santa Barbara, KITP; Sun, Kai; Fradkin, Eduardo; /Illinois U., Urbana; Zhang, Shou-Cheng; /Stanford U., Phys. Dept.

2010-03-16T23:59:59.000Z

355

Energy growth in the compliant channel  

E-Print Network (OSTI)

Energy growth in the compliant channel Jérôme Hoepffner Julien Favier, Alessandro Bottaro #12 stiffness K Forcing by the pressure #12;Energy Flow energy+wall kinetic and potential energy: Energy: 2) Optimality: #12;"=0, stable #12;Optimization results Growth enveloppe Energy evolution

Hoepffner, Jérôme

356

Turbulence Characteristics in a Tidal Channel  

Science Conference Proceedings (OSTI)

A broadband ADCP and a moored microstructure instrument (TAMI) were deployed in a tidal channel of 30-m depth and with peak speeds of 1 m s?1. The measurements enable us to derive profiles of stress, turbulent kinetic energy (TKE), the rate of ...

Youyu Lu; Rolf G. Lueck; Daiyan Huang

2000-05-01T23:59:59.000Z

357

Sabine-Neches Waterway Channel Improvement Project  

E-Print Network (OSTI)

vessels, the amount of vessel traffic on the SNWW has also increased. Both the SNWW and U.S. crude oil of navigation on the waterway. The current channel was completed in 1960. At that time, crude oil tankers are now used routinely for crude oil imports to both Beaumont and Port Arthur. In addition to larger

US Army Corps of Engineers

358

Superconducting solenoids for the MICE channel  

DOE Green Energy (OSTI)

This report describes the channel of superconductingsolenoids for the proposed international Muon Ionization CoolingExperiment (MICE). MICE consists of two cells of a SFOFO cooling channelthat is similar to that studied in the level 2 study of a neutrinofactory[1]. MICE also consists of two detector solenoids at either end ofthe cooling channel section. The superconducting solenoids for MICEperform three functions. The coupling solenoids, which are largesolenoids around 201.25 MHz RF cavities, couple the muon beam between thefocusing sections as it passes along the cooling channel. The focusingsolenoids are around the liquid hydrogen absorber that reduces themomentum of the muons in all directions. These solenoids generate agradient field along the axis as they reduce the beta of the muon beambefore it enters the absorber. Each detector solenoid system consists offive coils that match the muon beam coming to or from an absorber to a4.0 T uniform solenoidal field section that that contains the particledetectors at the ends of the experiment. There are detector solenoids atthe beginning and at the end of the experiment. This report describes theparameters of the eighteen superconducting coils that make up the MICEmagnetic channel.

Green, M.A.; Barr, G.; Baynham, D.E.; Rockford, J.H.; Fabbricatore, P.; Farinin, S.; Palmer, R.B.; Rey, J.M.

2003-05-01T23:59:59.000Z

359

Side-Channel leakage across borders  

Science Conference Proceedings (OSTI)

More and more embedded devices store sensitive information that is protected by means of cryptography. The confidentiality of this data is threatened by information leakage via side channels like the power consumption or the electromagnetic radiation. ... Keywords: I/O pin, microcontroller, optocoupler, power analysis, serial interface

Jörn-Marc Schmidt; Thomas Plos; Mario Kirschbaum; Michael Hutter; Marcel Medwed; Christoph Herbst

2010-04-01T23:59:59.000Z

360

Constrained capacity of MIMO Rayleigh fading channels  

E-Print Network (OSTI)

In this thesis channel capacity of a special type of multiple-input multiple-output (MIMO) Rayleigh fading channels is studied, where the transmitters are subject to a finite phase-shift keying (PSK) input alphabet. The constraint on the input alphabet makes an analytical solution for the capacity beyond reach. However we are able to simplify the final expression, which requires a single expectation and thus can be evaluated easily through simulation. To facilitate simulations, analytical expressions are derived for the eigenvalues and eigenvectors of a covariance matrix involved in the simplified capacity expression. The simplified expression is used to provide some good approximations to the capacity at low signal-to-noise ratios (SNRs). Involved in derivation of the capacity is the capacity-achieving input distribution. It is proved that a uniform prior distribution is capacity achieving. We also show that it is the only capacity-achieving distribution for our channel model. On top of that we generalize the uniqueness case for an input distribution to a broader range of channels.

He, Wenyan

2011-05-01T23:59:59.000Z

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


361

Department of Agricultural and Resource EconomicsDetermining the Impact of Retailer Store Brand Procurement on Vertical Relationships with Brand Manufacturers and on Market Equilibrium †  

E-Print Network (OSTI)

This paper investigates how a retailer’s store brand supply source impacts vertical pricing and supply channel profitability. Using chain-level retail scanner data from major supermarkets in Boston prior to the leading retailer’s divestiture of its store brand milk processing to a major brand manufacturer I estimate a random coefficients logit demand model employing a Bayesian estimation approach. Bayesian decision theory is applied to select from a set of pricing games the one most likely for the data sample analyzed. Results from this analysis indicate that the empirically valid model has the pre-divested retailer integrated into the processing of its own milk and takes as given the wholesale price of brand milks while competing retailers have nonlinear pricing contracts with brand manufacturers who produce their store brands. This model is matched against a series of counterfactual simulations as a baseline. The counterfactual simulations consider the eventual divestiture of store brand milk processing by the leading retailer

Michael A. Cohen; Michael A. Cohen

2010-01-01T23:59:59.000Z

362

Fuel cell collector plates with improved mass transfer channels  

DOE Patents (OSTI)

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.

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

2003-04-22T23:59:59.000Z

363

Simulating a single qubit channel using a mixed state environment  

E-Print Network (OSTI)

We analyze the class of single qubit channels with the environment modeled by a one-qubit mixed state. The set of affine transformations for this class of channels is computed analytically, employing the canonical form for the two-qubit unitary operator. We demonstrate that, 3/8 of the generalized depolarizing channels can be simulated by the one-qubit mixed state environment by explicitly obtaining the shape of the volume occupied by this class of channels within the tetrahedron representing the generalized depolarizing channels. Further, as a special case, we show that the two-Pauli Channel cannot be simulated by a one-qubit mixed state environment.

Geetu Narang; Arvind

2006-11-06T23:59:59.000Z

364

The Effect of Channel Length on the Residual Circulation in Tidally Dominated Channels  

Science Conference Proceedings (OSTI)

With an analytic model, this paper describes the subtidal circulation in tidally dominated channels of different lengths, with arbitrary lateral depth variations. The focus is on an important parameter associated with the reversal of the exchange ...

Chunyan Li; James O’Donnell

2005-10-01T23:59:59.000Z

365

Quantum Capacity Approaching Codes for the Detected-Jump Channel  

E-Print Network (OSTI)

The quantum channel capacity gives the ultimate limit for the rate at which quantum data can be reliably transmitted through a noisy quantum channel. Degradable quantum channels are among the few channels whose quantum capacities are known. Given the quantum capacity of a degradable channel, it remains challenging to find a practical coding scheme which approaches capacity. Here we discuss code designs for the detected-jump channel, a degradable channel with practical relevance describing the physics of spontaneous decay of atoms with detected photon emission. We show that this channel can be used to simulate a binary classical channel with both erasures and bit-flips. The capacity of the simulated classical channel gives a lower bound on the quantum capacity of the detected-jump channel. When the jump probability is small, it almost equals the quantum capacity. Hence using a classical capacity approaching code for the simulated classical channel yields a quantum code which approaches the quantum capacity of the detected-jump channel.

Markus Grassl; Zhengfeng Ji; Zhaohui Wei; Bei Zeng

2010-08-19T23:59:59.000Z

366

Design and Analysis of the ITER Vertical Stability Coils  

SciTech Connect

The ITER vertical stability (VS) coils have been developed through the preliminary design phase by Princeton Plasma Physics Laboratory (PPPL). Final design, prototyping and construction will be carried out by the Chinese Participant Team contributing lab, Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP). The VS coils are a part of the in-vessel coil systems which include edge localized mode (ELM) coils as well as the VS coils. An overview of the ELM coils is provided in another paper at this conference. 15 The VS design employs four turns of stainless steel jacketed mineral insulated copper (SSMIC) conductors The mineral insulation is Magnesium Oxide (MgO). Joule and nuclear heat is removed by water flowing at 3 m/s through the hollow copper conductor. A key element in the design is that slightly elevated temperatures in the conductor and its support spine during operation impose compressive stresses that mitigate fatigue damage. Away from joints, and break-outs, conductor thermal stresses are low because of the axisymmetry of the winding (there are no corner bends as in the ELM coils).The 120 degree segment joint, and break-out or terminal regions are designed with similar but imperfect constraint compared with the ring coil portion of the VS. The support for the break-out region is made from a high strength copper alloy, CuCrZr. This is needed to conduct nuclear heat to the actively cooled conductor and to the vessel wall. The support "spine" for the ring coil portion of the VS is 316 stainless steel, held to the vessel with preloaded 718 bolts. Lorentz loads resulting from normal operating loads, disruption loads and loads from disruption currents in the support spine shared with vessel, are applied to the VS coil. The transmission of the Lorentz and thermal expansion loads from the "spine" to the vessel rails is via friction augmented with a restraining "lip" to ensure the coil frictional slip is minimal and acceptable. Stresses in the coil, joints, and break-outs are presented. These are compared with static and fatigue allowables. Design for fatigue is much less demanding than for the ELM coils. A total of 30,000 cycles is required for VS design. Loads on the vessel due to the thermal expansion of the coil and spine are significant. Efforts to reduce these by reducing the cross section of the spine have been made but the vessel still must support loads resulting from restraint of thermal expansion.

Peter H. Titus, et. al.

2012-09-06T23:59:59.000Z

367

Bits About the Channel: Multi-round Protocols for Two-way Fading Channels  

E-Print Network (OSTI)

Most communication systems use some form of feedback, often related to channel state information. In this paper, we study diversity multiplexing tradeoff for both FDD and TDD systems, when both receiver and transmitter knowledge about the channel is noisy and potentially mismatched. For FDD systems, we first extend the achievable tradeoff region for 1.5 rounds of message passing to get higher diversity compared to the best known scheme, in the regime of higher multiplexing gains. We then break the mold of all current channel state based protocols by using multiple rounds of conferencing to extract more bits about the actual channel. This iterative refinement of the channel increases the diversity order with every round of communication. The protocols are on-demand in nature, using high powers for training and feedback only when the channel is in poor states. The key result is that the diversity multiplexing tradeoff with perfect training and K levels of perfect feedback can be achieved, even when there are er...

Aggarwal, Vaneet

2009-01-01T23:59:59.000Z

368

Roderick MacKinnon and Ion Channels - Potassium Channels and Sodium  

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

Roderick MacKinnon and Ion Channels Roderick MacKinnon and Ion Channels Resources with Additional Information · Patents Roderick MacKinnon Courtesy of The Rockefeller University Roderick MacKinnon, M.D., a visiting researcher at the U.S. Department of Energy's Brookhaven National Laboratory, is a recipient of the 2003 Nobel Prize in Chemistry 'for structural and mechanistic studies of ion channels.' His research explains "how a class of proteins helps to generate nerve impulses - the electrical activity that underlies all movement, sensation, and perhaps even thought. The work leading to the prize was done primarily at the Cornell High Energy Synchrotron Source [CHESS] and the National Synchrotron Light Source [NSLS] at Brookhaven. The proteins, called ion channels, are tiny pores that stud the surface of all of our cells. These channels allow the passage of potassium, calcium, sodium, and chloride molecules called ions. Rapid-fire opening and closing of these channels releases ions, moving electrical impulses from the brain in a wave to their destination in the body."1

369

V-128: Xen Event Channel Tracking Pointer Bug Local Privilege...  

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

8: Xen Event Channel Tracking Pointer Bug Local Privilege Escalation V-128: Xen Event Channel Tracking Pointer Bug Local Privilege Escalation April 8, 2013 - 12:28am Addthis...

370

Frictionally Modified Rotating Hydraulic Channel Exchange and Ocean Outflows  

Science Conference Proceedings (OSTI)

Laboratory experiments of two-layer exchange through channels of circular and half-circular cross section are described. Simple theoretical limits on exchange for the circular channels are obtained from models involving either friction or ...

Gregory C. Johnson; Daniel R. Ohlsen

1994-01-01T23:59:59.000Z

371

Transmission Policies for Asymmetric Interference Channels with Energy Harvesting Nodes  

E-Print Network (OSTI)

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

Yener, Aylin

372

Defending against side-channel attacks : DynamoREA  

E-Print Network (OSTI)

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 ...

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

2011-01-01T23:59:59.000Z

373

Molecular Mechanisms of a Retinal Cyclic Nucleotide-Gated Channel.  

E-Print Network (OSTI)

??Cyclic nucleotide-gated (CNG) channels mediate the transduction of light signals to electrical signals in vertebrate photoreceptors. These channels are non-selective for cations and open upon… (more)

Martinez-Francois, Juan R

2009-01-01T23:59:59.000Z

374

Analysis of global channel costs for the pharmaceutical industry  

E-Print Network (OSTI)

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 ...

Rimling, Eric C. (Eric Christopher)

2009-01-01T23:59:59.000Z

375

Evaluating demand planning strategy in the retail channel  

E-Print Network (OSTI)

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 ...

Zehavi, Limor (Limor Hadas)

2012-01-01T23:59:59.000Z

376

Diamond Channel with Partially Separated Relays Ravi Tandon Sennur Ulukus  

E-Print Network (OSTI)

Diamond Channel with Partially Separated Relays Ravi Tandon Sennur Ulukus Department of Electrical Theory, 27(1):122­125, January 1981. [8] R. Tandon and S. Ulukus. Diamond channels with partially

Ulukus, Sennur

377

Six-channel adaptive fibre-optic interferometer  

SciTech Connect

We have proposed and analysed a scheme for the multiplexing of orthogonal dynamic holograms in photorefractive crystals which ensures almost zero cross talk between the holographic channels upon phase demodulation. A six-channel adaptive fibre-optic interferometer was built, and the detection limit for small phase fluctuations in the channels of the interferometer was determined to be 2.1 Multiplication-Sign 10{sup -8} rad W{sup 1/2} Hz{sup -1/2}. The channel multiplexing capacity of the interferometer was estimated. The formation of 70 channels such that their optical fields completely overlap in the crystal reduces the relative detection limit in the working channel by just 10 %. We found conditions under which the maximum cross talk between the channels was within the intrinsic noise level in the channels (-47 dB).

Romashko, R V; Bezruk, M N; Kamshilin, A A; Kulchin, Yurii N

2012-06-30T23:59:59.000Z

378

Zero-error capacity of a quantum channel  

E-Print Network (OSTI)

We define the quantum zero-error capacity, a new kind of classical capacity of a noisy quantum channel. Moreover, the necessary requirement for which a quantum channel has zero-error capacity greater than zero is also given.

Rex A. C. Medeiros; Francisco M. de Assis

2004-03-26T23:59:59.000Z

379

Vertical Wavenumber Spectra of Gravity Waves in the Martian Atmosphere Obtained from Mars Global Surveyor Radio Occultation Data  

Science Conference Proceedings (OSTI)

Vertical wavenumber spectra of Martian gravity waves were obtained for the altitude range 3–32 km from temperature profiles acquired by the Mars Global Surveyor (MGS) radio occultation experiments. The spectra, which cover vertical wavelengths ...

Hiroki Ando; Takeshi Imamura; Toshitaka Tsuda

2012-09-01T23:59:59.000Z

380

Accurate Alignment of Plasma Channels Based on Laser Centroid Oscillations  

Science Conference Proceedings (OSTI)

A technique has been developed to accurately align a laser beam through a plasma channel by minimizing the shift in laser centroid and angle at the channel outptut. If only the shift in centroid or angle is measured, then accurate alignment is provided by minimizing laser centroid motion at the channel exit as the channel properties are scanned. The improvement in alignment accuracy provided by this technique is important for minimizing electron beam pointing errors in laser plasma accelerators.

Gonsalves, Anthony; Nakamura, Kei; Lin, Chen; Osterhoff, Jens; Shiraishi, Satomi; Schroeder, Carl; Geddes, Cameron; Toth, Csaba; Esarey, Eric; Leemans, Wim

2011-03-23T23:59:59.000Z

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


381

BWR Channel Bow Model: Technical Bases, Description, and Qualification  

Science Conference Proceedings (OSTI)

A model has been developed for the prediction of Zircaloy-2 (Zr-2) channel bow, including fast fluence gradient-induced channel bow and control blade shadow corrosion-induced channel bow. This report provides: (1) a description of the channel bow model in its present form, (2) the technical bases for the model formulations, (3) detailed qualification of the model prediction capability by comparison of predictions to the available performance characterization measurements, and ...

2013-05-20T23:59:59.000Z

382

LEP Center-of-Mass Energies in Presence of Opposite Sign Vertical Dispersion in Bunch-Train Operation  

E-Print Network (OSTI)

LEP Center-of-Mass Energies in Presence of Opposite Sign Vertical Dispersion in Bunch-Train Operation

CERN. Geneva

1995-01-01T23:59:59.000Z

383

Throughput and Channel Access Statistics of Generalized Selection Multiuser Scheduling  

Science Conference Proceedings (OSTI)

To provide a near-optimal low-complexity solution to parallel multiuser scheduling in code-division multiple-access (CDMA), we propose generalized selection multiuser diversity (GSMuD) schemes with multi-code channel assignment and analyze their performance. ... Keywords: Multiuser diversity, channel access statistics, fairness, generalized fading channels, multicode CDMA, throughput

Yao Ma; Jinghua Jin; Dongbo Zhang

2008-08-01T23:59:59.000Z

384

Microwave Radiometer – 3 Channel (MWR3C) Handbook  

SciTech Connect

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.

Cadeddu, MP

2012-05-04T23:59:59.000Z

385

Instantaneous Capacity of OFDM on Rayleigh-Fading Channels  

Science Conference Proceedings (OSTI)

For a power limited orthogonal frequency-division multiplexing (OFDM) system transmitting a large number N of subcarriers over a Rayleigh-fading channel, the distribution of the instantaneous capacity is shown to be approximately Gaussian. The mean and ... Keywords: Channel capacity, Rayleigh-fading channels, orthogonal frequency-division multiplexing (OFDM)

A. Clark; P. J. Smith; D. P. Taylor

2007-01-01T23:59:59.000Z

386

Linear signal-compensated amplifier for reactor power measuring channels  

Science Conference Proceedings (OSTI)

A linear amplifier with automatic signal compensation has been developed for nuclear channels. The amplifiercontrols its sensitivity automatically according to the reference input within the desired settings and has automatic signal compensation capability for use in the nuclear channels. The amplifier will be used in the existing safety channel of Pakistan Research Reactor-1

M. Tahir Khaleeq; Atique-ur-Rahman; Eijaz Ahmed

2006-01-01T23:59:59.000Z

387

Charm mass effects in bulk channel correlations  

E-Print Network (OSTI)

The bulk viscosity of thermalized QCD matter at temperatures above a few hundred MeV could be significantly influenced by charm quarks because their contribution arises four perturbative orders before purely gluonic effects. In an attempt to clarify the challenges of a lattice study, we determine the relevant imaginary-time correlator (of massive scalar densities) up to NLO in perturbation theory, and compare with existing data. We find discrepancies much larger than in the vector channel; this may hint, apart from the importance of taking a continuum limit, to larger non-perturbative effects in the scalar channel. We also recall how a transport peak related to the scalar density spectral function encodes non-perturbative information concerning the charm quark chemical equilibration rate close to equilibrium.

Y. Burnier; M. Laine

2013-09-06T23:59:59.000Z

388

TRANSIENT HEAT TRANSFER IN REACTOR COOLANT CHANNELS  

SciTech Connect

An analysis is presented of the transient behavior of a generalized cooiant channel neglecting temperature dependent reactivity changes. The analysis is applicable to forced convection cooling of heterogeneous reactor fuel elements or electrically heated simulation thereof. Derivations are given for cases of variation of coolant inlet temperature and of heat generation. An approximation is also developed applicable to thin fuel elements. From this, solutions are obtained for cases-of impulsive, step, linear, and step-exponential variations of inlet temperature, and, of impulsive and uniform variations of heat generation. The solutions presented will be of use during preliminary stages of design of new heterogeneous reactor concepts (when the use of computing machines may not be warranted), and, in the design and interpretation of transient experiments simulating reactor fuel channels. (auth)

Stein, R.P.

1957-10-31T23:59:59.000Z

389

Fractional diffusion modeling of ion channel gating  

E-Print Network (OSTI)

An anomalous diffusion model for ion channel gating is put forward. This modeling scheme is able to describe the non-exponential, power-law like gating behavior of residence time intervals in several types of ion channels. Our scheme presents a generalization of the discrete diffusion model by Millhauser, Salpeter and Oswald [Proc. Natl. Acad. Sci. USA 85, 1503 (1988)] to the case of a continuous, anomalously slow conformational diffusion. The corresponding generalization is derived from a continuous time random walk composed of nearest neighbor jumps which in the scaling limit results in a fractional diffusion equation. The studied model contains three parameters only: the mean residence time, a characteristic time of conformational diffusion, and the index of subdiffusion. A tractable analytical expression for the characteristic function of the residence time distribution (RTD) is obtained. In the limiting case of normal diffusion a prior result of Goychuk and Hanggi [Proc. Natl. Acad. Sci. USA 99, 3552 (20...

Goychuk, I; Goychuk, Igor; Hanggi, Peter

2004-01-01T23:59:59.000Z

390

An Exploratory Analysis of the Relationship Between Organizational and Institutional Factors Shaping the Assimilation of Vertical Standards  

Science Conference Proceedings (OSTI)

Vertical standards describe products and services, define data formats and structures, and formalize and encode business processes for specific industries. Vertical standards enable end-to-end computing, provide greater visibility of the organization's ... Keywords: Standards, Standards Assimilation, Standards Diffusion, Vertical Standards, XML

T. Ravichandran; Rubén A. Mendoza

2011-01-01T23:59:59.000Z

391

Computational optimization of synthetic water channels.  

Science Conference Proceedings (OSTI)

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.

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

2012-12-01T23:59:59.000Z

392

Channel simulation with quantum side information  

E-Print Network (OSTI)

We study and solve the problem of classical channel simulation with quantum side information at the receiver. This is a generalization of both the classical reverse Shannon theorem, and the classical-quantum Slepian-Wolf problem. The optimal noiseless communication rate is found to be reduced from the mutual information between the channel input and output by the Holevo information between the channel output and the quantum side information. Our main theorem has two important corollaries. The first is a quantum generalization of the Wyner-Ziv problem: rate-distortion theory with quantum side information. The second is an alternative proof of the trade-off between classical communication and common randomness distilled from a quantum state. The fully quantum generalization of the problem considered is quantum state redistribution. Here the sender and receiver share a mixed quantum state and the sender wants to transfer part of her state to the receiver using entanglement and quantum communication. We present outer and inner bounds on the achievable rate pairs.

Zhicheng Luo; Igor Devetak

2006-11-01T23:59:59.000Z

393

Vertical Dispersion from Surface and Elevated Releases: An Investigation of a Non-Gaussian Plume Model  

Science Conference Proceedings (OSTI)

The vertical diffusion of a passive tracer released from surface and elevated sources in a neutrally stratified boundary layer has been studied by comparing field and laboratory experiments with a non-Gaussian K-theory model that assumes power-...

Michael J. Brown; S. Pal Arya; William H. Snyder

1993-03-01T23:59:59.000Z

394

Sensitivity of Simulated Climate to Horizontal and Vertical Resolution in the ECHAM5 Atmosphere Model  

Science Conference Proceedings (OSTI)

The most recent version of the Max Planck Institute for Meteorology atmospheric general circulation model, ECHAM5, is used to study the impact of changes in horizontal and vertical resolution on seasonal mean climate. In a series of Atmospheric ...

E. Roeckner; R. Brokopf; M. Esch; M. Giorgetta; S. Hagemann; L. Kornblueh; E. Manzini; U. Schlese; U. Schulzweida

2006-08-01T23:59:59.000Z

395

Principal Component Analysis of Vertical Profiles of Q1 and Q2 in the Tropics  

Science Conference Proceedings (OSTI)

Rotated Principal component analysis (PCA) is applied to the combined vertical profiles of apparent heat source Q1 and apparent moisture sink Q2 from both disturbed and undisturbed periods of the Australian summer monsoon season. The data ...

G. David Alexander; George S. Young; David V. Ledvina

1993-02-01T23:59:59.000Z

396

Use of vertical slip flow and flooding models in LOCA analysis  

SciTech Connect

Vertical slip flow and flooding models, which have been incorporated in a version of the RELAP4 computer code by Aerojet Nuclear Company have led to significant improvements in modeling nuclear reactor coolant system phenomena during postulated large and small break loss-of-coolant accidents. The vertical slip flow model computes the separated fluid component velocities and directions at vertical flow junctions. Use of the slip model allows the energy transfer between volumes to be based on individual liquid and vapor component flows rather than on the net junction flow. Continuity and momentum equations are unaffected by the addition of slip. The vertical flow slip model logic is based on the assumption that gravity forces dominate causing slip between phases. 7 references (auth)

Fischer, S.R.

1975-01-01T23:59:59.000Z

397

Comparison of Radiosonde and GCM Vertical Temperature Trend Profiles: Effects of Dataset Choice and Data Homogenization  

Science Conference Proceedings (OSTI)

In comparisons of radiosonde vertical temperature trend profiles with comparable profiles derived from selected Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (AR4) general circulation models (GCMs) driven by major ...

John R. Lanzante; Melissa Free

2008-10-01T23:59:59.000Z

398

External Influences on Hurricane Intensity. Part II: Vertical Structure and Response of the Hurricane Vortex  

Science Conference Proceedings (OSTI)

The vertical structure of the interaction of Hurricane Elena (1985) with a baroclinic wave was evaluated using analyses from the European Centre for Medium Range Weather Forecasting. During the period of interaction, azimuthal eddies produced a ...

John Molinari; David Vollaro

1990-08-01T23:59:59.000Z

399

Particle Image Velocimetry Study on the Stripe Formation in Vertically Vibrated Granules  

E-Print Network (OSTI)

Recently, granules under vertical vibrations receive many attentions due to their importance in theoretical research and engineering application. In this paper, a two-dimensional Particle Image Velocimetry (PIV) system was ...

Deng, Rensheng

400

The Downwind Spread of an Initially Vertical Column of Particles in a Sheared Environment  

Science Conference Proceedings (OSTI)

The effects of particle fallspeeds on the downwind spread of initially vertical columns or curtains are examined in environments with wind shear. Sets of equations describing the column width as a function of time and distance below column top ...

Ronald E. Stewart; John D. Marwitz

1982-08-01T23:59:59.000Z

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


401

Adaptive Detached Eddy Simulation of a Vertical Tail with Active Flow  

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

Adaptive Detached Eddy Simulation of a Vertical Tail with Active Flow Control Adaptive Detached Eddy Simulation of a Vertical Tail with Active Flow Control Adaptive Detached Eddy Simulation of a Vertical Tail with Active Flow Control PI Name: Kenneth Jansen PI Email: jansenke@colorado.edu Institution: University of Colorado Allocation Program: INCITE Allocation Hours at ALCF: 40 Million Year: 2012 Research Domain: Engineering The use of fuel-and its accompanying costs-has become an increasing concern in many industries. Researchers are examining the issue of fuel reduction in commercial jet aircraft from the perspective of redesign. By redesigning the vertical tail of a commercial jet, they hope to reduce jet fuel use by 0.5%, resulting in annual savings of $300 million. Using -synthetic commercial jet aircraft, the team will perform a series

402

ARM - PI Product - SGP and TWP (Manus) Ice Cloud Vertical Velocities  

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

ProductsSGP and TWP (Manus) Ice Cloud Vertical ProductsSGP and TWP (Manus) Ice Cloud Vertical Velocities Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send PI Product : SGP and TWP (Manus) Ice Cloud Vertical Velocities 1997.01.01 - 2010.12.31 Site(s) SGP TWP General Description Daily netcdf-files of ice-cloud dynamics observed at the ARM sites at SGP (Jan1997-Dec2010) and Manus (Jul1999-Dec2010). The files include variables at different time resolution (10s, 20min, 1hr). Profiles of radar reflectivity factor (dbz), Doppler velocity (vel) as well as retrieved vertical air motion (V_air) and reflectivity-weighted particle terminal fall velocity (V_ter) are given at 10s, 20min and 1hr resolution. Lower level clouds are removed, however a multi-layer flag is included.

403

Numerical Solution of the Vertical Structure Equation in the Normal Mode Method  

Science Conference Proceedings (OSTI)

In a diagnostic study by expanding global data in normal mode functions, Kasahara and Puri found that for zonal wavenumber one, even the seventh vertical mode (the highest mode they presented) contains about 50% of the energy of the external ...

Y. K. Sasaki; L. P. Chang

1985-05-01T23:59:59.000Z

404

Organization of Tropical Convection in Low Vertical Wind Shears: The Role of Water Vapor  

Science Conference Proceedings (OSTI)

A modeling study is conducted to gain insight into the factors that control the intensity and organization of tropical convection, and in particular to examine if organization occurs in the absence of factors such as vertical wind shear or ...

Adrian M. Tompkins

2001-03-01T23:59:59.000Z

405

Vertical Air Motion from T-REX Radiosonde and Dropsonde Data  

Science Conference Proceedings (OSTI)

The primary goal of this study is to explore the potential for estimating the vertical velocity (VV) of air from the surface to the stratosphere, using widely available radiosonde and dropsonde data. The rise and fall rates of radiosondes and ...

Junhong Wang; Jianchun Bian; William O. Brown; Harold Cole; Vanda Grubiši?; Kate Young

2009-05-01T23:59:59.000Z

406

A Surface Flux Parameterization Based on the Vertically Averaged Turbulence Kinetic Energy  

Science Conference Proceedings (OSTI)

A new bulk transfer formulation for the surface turbulent fluxes of momentum, heat, and moisture has been developed by using the square root of the vertically averaged turbulent kinetic energy (TKE) in the atmospheric boundary layer as a velocity ...

Changan Zhang; David A. Randall; Chin-Hoh Moeng; Mark Branson; Kerry A. Moyer; Qing Wang

1996-11-01T23:59:59.000Z

407

Effect of Vertical Wind Shear on Numerically Simulated Multicell Storm Structure  

Science Conference Proceedings (OSTI)

A strictly two-dimensional cloud model was used to gauge the effect of vertical wind shear on the mature phase behavior of model-simulated multicellular storms, extending the previous work of the authors. We specifically examined the propagation ...

Robert G. Fovell; Yoshi Ogura

1989-10-01T23:59:59.000Z

408

Characterization of Vertical Velocity and Drop Size Distribution Parameters in Widespread Precipitation at ARM Facilities  

Science Conference Proceedings (OSTI)

Extended, high-resolution measurements of vertical air motion and median volume drop diameter D0 in widespread precipitation from three diverse Atmospheric Radiation Measurement Program (ARM) locations [Lamont, Oklahoma, Southern Great Plains site ...

Scott E. Giangrande; Edward P. Luke; Pavlos Kollias

2012-02-01T23:59:59.000Z

409

Vertical Temperature Profiles at Maximum Entropy Production with a Net Exchange Radiative Formulation  

Science Conference Proceedings (OSTI)

Like any fluid heated from below, the atmosphere is subject to vertical instability which triggers convection. Convection occurs on small time and space scales, which makes it a challenging feature to include in climate models. Usually sub-grid ...

Corentin Herbert; Didier Paillard; Bérengère Dubrulle

410

Cloud and Water Vapor Feedbacks in a Vertical Energy-Balance Model with Maximum Entropy Production  

Science Conference Proceedings (OSTI)

A vertically one-dimensional model is developed with cloud fraction constrained by the maximum entropy production (MEP) principle. The model reasonably reproduces the global mean climate with its surface temperature, radiation and heat fluxes, ...

Biao Wang; Teruyuki Nakajima; Guangyu Shi

2008-12-01T23:59:59.000Z

411

Correlation Coefficients between Horizontally and Vertically Polarized Returns from Ground Clutter  

Science Conference Proceedings (OSTI)

Characteristics of the magnitude and phase of correlation coefficients between horizontally and vertically polarized returns from ground clutter echoes are quantified by analyzing histograms obtained with an 11-cm wavelength weather surveillance ...

Dusan S. Zrni?; Valery M. Melnikov; Alexander V. Ryzhkov

2006-03-01T23:59:59.000Z

412

Seasonality of Vertical Structure in Radar-Observed Precipitation over Southern Switzerland  

Science Conference Proceedings (OSTI)

Operational radar data reveal that precipitation systems occurring on the southern side of the Alps near Locarno, Switzerland, follow seasonal patterns of vertical reflectivity structure. Storms occurring in summer are more convective than winter ...

James V. Rudolph; Katja Friedrich

2013-02-01T23:59:59.000Z

413

Quadratic Galerkin Finite Element Schemes for the Vertical Discretization of Numerical Forecast Models  

Science Conference Proceedings (OSTI)

A finite element scheme with second-order basis functions is introduced for vertical discretization using a spectral model for horizontal discretization. The basis functions are required to be continuous, and no assumption is made concerning the ...

J. Steppeler

1987-08-01T23:59:59.000Z

414

The Influence of Whitecapping Waves on the Vertical Structure of Turbulence in a Shallow Estuarine Embayment  

Science Conference Proceedings (OSTI)

The vertical distribution of the turbulent kinetic energy dissipation rate was measured using an array of four acoustic Doppler velocimeters in the shallow embayment of Grizzly Bay, San Francisco Bay, California. Owing to the combination of wind ...

Nicole L. Jones; Stephen G. Monismith

2008-07-01T23:59:59.000Z

415

A Simple Model of Climatological Rainfall and Vertical Motion Patterns over the Tropical Oceans  

Science Conference Proceedings (OSTI)

A simple model is developed that predicts climatological rainfall, vertical motion, and diabatic heating profiles over the tropical oceans given the sea surface temperature (SST), using statistical relationships deduced from the 40-yr ECMWF Re-...

Larissa E. Back; Christopher S. Bretherton

2009-12-01T23:59:59.000Z

416

Entropy in Climate Models. Part I: Vertical Structure of Atmospheric Entropy Production  

Science Conference Proceedings (OSTI)

The vertical atmospheric entropy structure has been investigated using one-dimensional radiative–convective models. A method for evaluating radiation entropy is proposed. In the models, the entropy radiation is dealt with in a way parallel to the ...

J. Li; Petr Chýlek; G. B. Lesins

1994-06-01T23:59:59.000Z

417

Optimization planning systems and their implementation and application in vertically integrated oil companies  

Science Conference Proceedings (OSTI)

The approaches to planning of activities of a vertically integrated oil company by using optimization systems are considered. Development, implementation, and support of such systems are discussed. These problems fall under the APS (Advanced Planning ...

A. S. Khokhlov; A. I. Konnov; A. E. Zel'Din

2012-04-01T23:59:59.000Z

418

Horizontal Wavenumber Spectra of Vertical Vorticity and Horizontal Divergence in the Upper Troposphere and Lower Stratosphere  

Science Conference Proceedings (OSTI)

The author shows that the horizontal two-point correlations of vertical vorticity and the associated vorticity wavenumber spectrum can be constructed from previously measured velocity structure functions in the upper troposphere and lower ...

Erik Lindborg

2007-03-01T23:59:59.000Z

419

The Vertical Structure of TOGA COARE Convection. Part II: Modulating Influences and Implications for Diabatic Heating  

Science Conference Proceedings (OSTI)

The temporal variability of western Pacific warm pool convection, especially its vertical structure, is examined in this study. Distributions of convective echo top heights and 30-dBZ contour heights have been produced from shipboard radar data ...

Charlotte A. DeMott; Steven A. Rutledge

1998-09-01T23:59:59.000Z

420

Horizontal Divergence and Vertical Velocity Retrievals from Doppler Radar and Wind Profiler Observations  

Science Conference Proceedings (OSTI)

Vertical motion profiles can be diagnosed with the mass continuity equation using horizontal divergence fields derived from various single-Doppler radar techniques such as EVAD (extended velocity-azimuth display), CEVAD (concurrent extended ...

Robert Cifelli; Steven A. Rutledge; Dennis J. Boccippio; Thomas Matejka

1996-10-01T23:59:59.000Z

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


421

The Coupling of Vertical Velocity and Signal Power Observed with the SOUSY VHF Radar  

Science Conference Proceedings (OSTI)

The perturbations to the static stability (and hence to the radar reflectivity) and to the velocity in a vertically propagating gravity wave are correlated, and the sign of the correlation depends on whether the wave is propagating upward or ...

G. D. Nastrom; R. Rüster; G. Schmidt

1998-01-01T23:59:59.000Z

422

HIRS-AMTS Satellite Sounding System Test—Theoretical and Empirical Vertical Resolving Power  

Science Conference Proceedings (OSTI)

Theoretical and empirical analyses of the vertical resolving power of the High resolution Infrared Radiation Sounder (HIRS) and the Advanced Moisture and Temperature Sounder (AMTS) is carried out. First, the infrared transmittance weighting ...

Owen E. Thompson

1982-10-01T23:59:59.000Z

423

Estimation of Mesoscale Vertical Derivatives of Potential Temperature and Density from Hydrographic Data  

Science Conference Proceedings (OSTI)

This study was motivated by the need to combine vertical derivative estimates of either potential density or temperature with SOFAR float data for estimating vortex stretching in the main (700 m) and lower thermocline (1300 m) of the Local ...

Arthur J. Mariano

1989-12-01T23:59:59.000Z

424

Vertical Mixing and the Temperature and Wind Structure of the Tropical Tropopause Layer  

Science Conference Proceedings (OSTI)

We show that vertical mixing can lead to significant momentum and heat fluxes in the tropical tropopause layer (TTL) and that these momentum and heat fluxes can force large climatological temperature and zonal wind changes in the TTL. We present ...

Thomas J. Flannaghan; Stephan Fueglistaler

425

Empirical Models of the Eddy Heat Flux and Vertical Shear on Short Time Scales  

Science Conference Proceedings (OSTI)

The relationship between the eddy heat flux and vertical shear in the extratropical atmosphere is studied by developing various linear stochastic models fitted to the observed January and July Northern Hemispheric data. Models are univariate or ...

Steven J. Ghan

1984-02-01T23:59:59.000Z

426

The Vertical Structure and Development of the ENSO Anomaly Mode during 1979–1989  

Science Conference Proceedings (OSTI)

The latest two Pacific basinwide warm episodes (1982–83 and 1986–87) exhibit some common features in their development and vertical structure. These features are examined by multivariate empirical orthogonal function analysis of the interannual ...

Bin Wang

1992-04-01T23:59:59.000Z

427

A Simple Model of Climatological Rainfall and Vertical Motion Patterns over the Tropical Oceans  

E-Print Network (OSTI)

A simple model is developed that predicts climatological rainfall, vertical motion, and diabatic heating profiles over the tropical oceans given the sea surface temperature (SST), using statistical relationships deduced ...

Back, Larissa E.

428

The Vertical Structure of the Eddy Diffusivity and the Equilibration of the Extratropical Atmosphere  

Science Conference Proceedings (OSTI)

Observations suggest that the time- and zonal-mean state of the extratropical atmosphere adjusts itself such that the so-called “criticality parameter” (which relates the vertical stratification to the horizontal temperature gradient) is close to ...

Malte Jansen; Raffaele Ferrari

2013-05-01T23:59:59.000Z

429

Vertical Heat Transport by Ocean Circulation and the Role of Mechanical and Haline Forcing  

Science Conference Proceedings (OSTI)

Vertical transport of heat by ocean circulation is investigated using a coupled climate model and novel thermodynamic methods. Using a streamfunction in temperature–depth coordinates, cells are identified by whether they are thermally direct (flux ...

Jan D. Zika; Willem P. Sijp; Matthew H. England

2013-10-01T23:59:59.000Z

430

Estimates of the Seasonal Mean Vertical Velocity Fields of the Extratropical Northern Hemisphere  

Science Conference Proceedings (OSTI)

Wintertime and summertime mean 500 mb vertical velocity fields for the extratropical Northern Hemisphere are calculated by several methods from general circulation statistics compiled from National Meteorological Center (NMC) operational analyses ...

Glenn H. White

1983-07-01T23:59:59.000Z

431

Asymmetric Hurricane Boundary Layer Structure from Dropsonde Composites in Relation to the Environmental Vertical Wind Shear  

Science Conference Proceedings (OSTI)

This study investigates the asymmetric structure of the hurricane boundary layer in relation to the environmental vertical wind shear in the inner core region. Data from 1878 GPS dropsondes deployed by research aircraft in 19 hurricanes are ...

Jun A. Zhang; Robert F. Rogers; Paul D. Reasor; Eric W. Uhlhorn; Frank D. Marks Jr.

2013-11-01T23:59:59.000Z

432

The Vertical Structure of the Eddy Diffusivity and the Equilibration of the Extratropical Atmosphere  

E-Print Network (OSTI)

Observations suggest that the time- and zonal-mean state of the extratropical atmosphere adjusts itself such that the so-called “criticality parameter” (which relates the vertical stratification to the horizontal temperature ...

Jansen, Malte

433

Vertical Motions Estimated Using Data from a Single Station and a Form of the Adiabatic Method  

Science Conference Proceedings (OSTI)

The so-called adiabatic method for estimating vertical air motions under isentropic flow conditions can be used with wind and temperature data from a single station. With the advent of radio acoustic sounding systems, wind and temperature ...

G. D. Nastrom; J. M. Warnock

1994-01-01T23:59:59.000Z

434

Vertical Wind Shear Influences on Tropical Cyclone Formation and Intensification during TCM-92 and TCM-93  

Science Conference Proceedings (OSTI)

Vertical wind shears between 200 and 850 mb are calculated from operational analyses and special interactive analyses for Tropical Storm Steve during the Tropical Cyclone Motion (TCM-93) field experiment and for Typhoon Omar at the end of the TCM-...

Russell L. Elsberry; Richard A. Jeffries

1996-07-01T23:59:59.000Z

435

A Field Study of Reflectivity and Z–R Relations Using Vertically Pointing Radars and Disdrometers  

Science Conference Proceedings (OSTI)

Observations from a 16-month field study using two vertically pointing radars and a disdrometer at Wallops Island are analyzed to examine the consistency of the multi-instrument observations with respect to reflectivity and Z–R relations. The ...

Ali Tokay; Peter Hartmann; Alessandro Battaglia; Kenneth S. Gage; Wallace L. Clark; Christopher R. Williams

2009-06-01T23:59:59.000Z

436

Vertical Velocity and Microphysical Distributions Related to Rapid Intensification in a Simulation of Hurricane Dennis (2005)  

Science Conference Proceedings (OSTI)

A 1-km Weather Research and Forecasting model simulation of Hurricane Dennis was used to identify precursors in vertical velocity and latent heating distributions to rapid intensification (RI). Although the observed structure qualitatively ...

Greg M. McFarquhar; Brian F. Jewett; Matthew S. Gilmore; Stephen W. Nesbitt; Tsung-Lin Hsieh

2012-12-01T23:59:59.000Z

437

Estimating the Vertical Component of Water Velocity from Measurements Collected with a Free-fall Vehicle  

Science Conference Proceedings (OSTI)

Estimated of the vertical component of water velocity are made with measurements of the pressure-change rate and rotation rate recorded by the free-fall vehicle “Cartesian diver” (CD). Using buoyancy control, this device moves alternately up and ...

David C. Jacobs; Charles S. Cox

1992-02-01T23:59:59.000Z

438

Characteristics of Vertical Velocity Cores in Different Convective Systems Observed over Gadanki, India  

Science Conference Proceedings (OSTI)

The Indian mesosphere–stratosphere–troposphere (MST) radar measurements during the passage of 60 convective systems are used to study the vertical air velocity (w) characteristics of tropical convection. The up- and downdraft cores and various ...

K. N. Uma; T. Narayana Rao

2009-03-01T23:59:59.000Z

439

Effects of Vertical Wind Shear and Storm Motion on Tropical Cyclone Rainfall Asymmetries Deduced from TRMM  

Science Conference Proceedings (OSTI)

Vertical wind shear and storm motion are two of the most important factors contributing to rainfall asymmetries in tropical cyclones (TCs). Global TC rainfall structure, in terms of azimuthal distribution and asymmetries relative to storm motion, ...

Shuyi S. Chen; John A. Knaff; Frank D. Marks Jr.

2006-11-01T23:59:59.000Z

440

Design of a Nonhydrostatic Atmospheric Model Based on a Generalized Vertical Coordinate  

Science Conference Proceedings (OSTI)

The isentropic system of equations has particular advantages in the numerical modeling of weather and climate. These include the elimination of the vertical velocity in adiabatic flow, which simplifies the motion to a two-dimensional problem and ...

Michael D. Toy; David A. Randall

2009-07-01T23:59:59.000Z

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


441

Numerical Experiments on Consistent Horizontal and Vertical Resolution for Atmospheric Models and Observing Systems  

Science Conference Proceedings (OSTI)

Simple numerical experiments are performed in order to determine the effects of inconsistent combinations of horizontal and vertical resolution in both atmospheric models and observing systems. In both cases, we find that inconsistent spatial ...

Michael S. Fox-Rabinovitz; Richard S. Lindzen

1993-01-01T23:59:59.000Z

442

The Importance of Ice Vertical Resolution for Snowball Climate and Deglaciation  

Science Conference Proceedings (OSTI)

Sea ice schemes with a few vertical levels are typically used to simulate the thermodynamic evolution of sea ice in global climate models. Here it is shown that these schemes overestimate the magnitude of the diurnal surface temperature cycle by ...

Dorian S. Abbot; Ian Eisenman; Raymond T. Pierrehumbert

2010-11-01T23:59:59.000Z

443

Vertical Diabatic Heating Structure of the MJO: Intercomparison between Recent Reanalyses and TRMM Estimates  

Science Conference Proceedings (OSTI)

Capitalizing on recently released reanalysis datasets and diabatic heating estimates based on Tropical Rainfall Measuring Mission (TRMM), the authors have conducted a composite analysis of vertical anomalous heating structures associated with the ...

Xianan Jiang; Duane E. Waliser; William S. Olson; Wei-Kuo Tao; Tristan S. L’Ecuyer; King-Fai Li; Yuk L. Yung; Shoichi Shige; Stephen Lang; Yukari N. Takayabu

2011-10-01T23:59:59.000Z

444

Vertical Transports by Plumes within the Moderately Convective Marine Atmospheric Surface Layer  

Science Conference Proceedings (OSTI)

Bursts in the kinematic vertical transports of heat and horizontal momentum in a moderately convective marine atmospheric surface layer are studied by applying the variable interval time averaging (VITA) detection method to principal components ...

Richard A. Mason; Hampton N. Shirer; Robert Wells; George S. Young

2002-04-01T23:59:59.000Z

445

Implementation of an E–? Parameterization of Vertical Subgrid-Scale Mixing in a Regional Model  

Science Conference Proceedings (OSTI)

An E–? parameterization of subgrid-scale vertical turbulent mixing has been installed in NORAPS (Navy operational Regional Atmospheric Prediction System). The 1.5-order parameterization uses full prognostic equations for turbulence kinetic energy ...

Rolf H. Langland; Chi-Sann Liou

1996-05-01T23:59:59.000Z

446

Identification of the Melting Layer through Dual-Polarization Radar Measurements at Vertical Incidence  

Science Conference Proceedings (OSTI)

Features of the melting layer of precipitation such as height and thickness are important in many meteorological applications. Doppler radar observations with a vertically pointing antenna have often been used in order to derive these features ...

Luca Baldini; Eugenio Gorgucci

2006-06-01T23:59:59.000Z

447

Association of the Laminated Vertical Ozone Structure with the Lower-Stratospheric Circulation  

Science Conference Proceedings (OSTI)

In this study the examination of the role of the atmospheric circulation in the lower stratosphere in relation to the laminated structure of ozone in the subtropical atmosphere is attempted. This analysis is based on the vertical ozone profile ...

C. Varotsos; P. Kalabokas; G. Chronopoulos

1994-04-01T23:59:59.000Z

448

Vertical Structure of Hurricane Eyewalls as Seen by the TRMM Precipitation Radar  

Science Conference Proceedings (OSTI)

Statistical analysis of the vertical structure of radar echoes in the eyewalls of tropical cyclones, shown by the Tropical Rainfall Measurement Mission (TRMM) Precipitation Radar (PR), shows that the eyewall contains high reflectivities and high ...

Deanna A. Hence; Robert A. Houze Jr.

2011-08-01T23:59:59.000Z

449

Vertical Structure of Tropical Cyclone Rainbands as Seen by the TRMM Precipitation Radar  

Science Conference Proceedings (OSTI)

Ten years of data from the Tropical Rainfall Measurement Mission satellite’s Precipitation Radar (TRMM PR) show the vertical structure of tropical cyclone rainbands. Radar-echo statistics show that rainbands have a two-layered structure, with ...

Deanna A. Hence; Robert A. Houze Jr.

2012-09-01T23:59:59.000Z

450

Transition from film boiling to nucleate boiling in forced convection vertical flow  

E-Print Network (OSTI)

The mechanism of collapse of forced cnnvection annular vertical flow film boiling, with liquid core, is investigated using liquid nitrogen at low pressures. The report includes the effect of heat flux from the buss bar. ...

Iloeje, Onwuamaeze C.

1972-01-01T23:59:59.000Z

451

Estimating Lower Tropospheric Vertical Motion from Surface Pressure and Pressure Tendency Data Alone  

Science Conference Proceedings (OSTI)

Existing methods for calculating synoptic and meso-alpha scale vertical motion rely on upper air sounding data which confines the calculations to restricted regions of the earth's surface and to sounding times. In this paper a method is proposed ...

Peter Zwack; Mustapha Kabil

1988-03-01T23:59:59.000Z

452

Radioactive air emissions notice of construction for vertical calciner operation at the plutonium finishing plant  

SciTech Connect

This document serves as a notice of construction (NOC) for construction, installation, and operation of a vertical calciner to stabilize plutonium at the Plutonium Finishing Plant (PFP)Complex, pursuant to the requirements of Washington Administrative Code (WAC) 246-247-060. The PFP Complex activities are focused on the cleanout and stabilization of plutonium residue left from plutonium weapons material processing activities. The prime purpose of the vertical calciner is to convert plutonium acid solutions to a more stable plutonium oxide. A test calciner has been developed and put in place in the 234-5Z Building. Development testing of this vertical calciner is ongoing. A new vertical calciner will be assembled for actual stabilization operation in Room 230C of the 234-5Z Building. The test calciner may be upgraded or replaced as an alternative to building a new calciner in Room 230C.

Hays, C.B., Westinghouse Hanford

1996-07-17T23:59:59.000Z

453

A Statistical Generalization of the Transformed Eulerian-Mean Circulation for an Arbitrary Vertical Coordinate System  

Science Conference Proceedings (OSTI)

A new method is derived for approximating the mean meridional circulation in an arbitrary vertical coordinate system using only the time-mean and zonally averaged meridional velocity, meridional eddy transport, and eddy variance. The method is ...

Olivier Pauluis; Tiffany Shaw; Frédéric Laliberté

2011-08-01T23:59:59.000Z

454

Interannual Variability in Rainfall, Water Vapor Flux, and Vertical Motion over West Africa  

Science Conference Proceedings (OSTI)

This study examines large-scale forcing mechanisms as they relate to initiation and maintenance of recent, long-term drought conditions in sub-Saharan Africa. The analysis uses 31-yr datasets of rainfall, moisture flux, and vertical motion. ...

Marybeth Long; Dara Entekhabi; Sharon E. Nicholson

2000-11-01T23:59:59.000Z

455

Fast Two-Stream Method for Computing Diurnal-Mean Actinic Flux in Vertically Inhomogeneous Atmospheres  

Science Conference Proceedings (OSTI)

Based on a derivation of the two-stream daytime-mean equations of radiative flux transfer, a method for computing the daytime-mean actinic fluxes in the absorbing and scattering vertically inhomogeneous atmosphere is suggested. The method applies ...

V. V. Filyushkin; S. Madronich; G. P. Brasseur; I. V. Petropavlovskikh

1994-04-01T23:59:59.000Z

456

Case Studies of the Vertical Velocity Seen by the Flatland Radar Compared with Indirectly Computed Values  

Science Conference Proceedings (OSTI)

The hypothesis that temporal averages of vertical motions over a single radar station are representative of weather systems large enough to be resolved by the radiosonde network is tested using data from the Flatland VHF radar, located in the ...

G. D. Nastrom; W. L. Clark; K. S. Gage; T. E. VanZandt; J. M. Warnock; R. Creasey; P. M. Pauley

1994-02-01T23:59:59.000Z

457

Effect of Volcanic Eruptions on the Vertical Temperature Profile in Radiosonde Data and Climate Models  

Science Conference Proceedings (OSTI)

Both observed and modeled upper-air temperature profiles show the tropospheric cooling and tropical stratospheric warming effects from the three major volcanic eruptions since 1960. Detailed comparisons of vertical profiles of Radiosonde ...

Melissa Free; John Lanzante

2009-06-01T23:59:59.000Z

458

Calculation of Consistent Flux and Advective Terms from Adjusted Vertical Profiles of Divergence  

Science Conference Proceedings (OSTI)

A simple framework is presented for adjusting the normal wind components in a polygon of data points which produces a vanishing vertical integral of horizontal divergence, allows correct calculation of flux and advective terms, and permits ...

John Molinari; Steven Skubis

1988-10-01T23:59:59.000Z

459

The Influence of the Vertical Coordinate on Simulations of a PV Streamer Crossing the Alps  

Science Conference Proceedings (OSTI)

In this note the impact of the vertical coordinate system on upper-tropospheric and lower-stratospheric structures is studied using the fifth-generation Pennsylvania State University–NCAR Mesoscale Model (MM5). Two different simulations are ...

Klaus P. Hoinka; Günther Zängl

2004-07-01T23:59:59.000Z

460

Characteristics of Vertical Velocity Fluctuations in a Convective Urban Boundary Layer  

Science Conference Proceedings (OSTI)

Vertical air motions within the convective boundary layer over Toronto, Canada, have been observed using a monostatic Doppler echosonde. Data were acquired on cloudless days with strong insolation and light winds, when turbulence dynamics were ...

Humfrey Melling; Roland List

1980-10-01T23:59:59.000Z

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


461

Retrieval of Vertical Profiles of Cirrus Cloud Microphysical Parameters from Doppler Radar and Infrared Radiometer Measurements  

Science Conference Proceedings (OSTI)

This paper describes a new method to retrieve vertical profiles of the parameters of cirrus cloud microphysics that are important for the estimation of climatic feedback. These parameters are the particle characteristic size and ice mass content. ...

S. Y. Matrosov; B. W. Orr; R. A. Kropfli; J. B. Snider

1994-05-01T23:59:59.000Z

462

Evolution of the Vertical Mass Flux and Diagnosed Net Lateral Mixing in Isolated Convective Clouds  

Science Conference Proceedings (OSTI)

The evolution of the vertical mass flux in isolated cumulus and cumulus congestus clouds is documented using two King Airs during the Convection and Precipitation/Electrification Experiment (CaPE,), conducted in east-central Florida during the ...

Gary M. Barnes; James C. Fankhauser; Wesley D. Browning

1996-12-01T23:59:59.000Z

463

Quasigeostrophic Turbulence in a Three-Layer Model: Effects of Vertical Structure in the Mean Shear  

Science Conference Proceedings (OSTI)

A three-layer, horizontally homogeneous, quasigeostrophic model is selected as one of the simplest environments in which to study the sensitivity of baroclinic eddy fluxes in the atmosphere to the vertical structure of the basic-state temperature ...

Isaac M. Held; Enda O'Brien

1992-10-01T23:59:59.000Z

464

Asymmetric Hurricane Boundary Layer Structure from Dropsonde Composites in Relation to the Environmental Vertical Wind Shear  

Science Conference Proceedings (OSTI)

This study investigates the asymmetric structure of the hurricane boundary layer in relation to the environmental vertical wind shear in the inner core region. Data from 1878 GPS dropsondes deployed by research aircraft in 19 hurricanes are ...

Jun A. Zhang; Robert F. Rogers; Paul D. Reasor; Eric W. Uhlhorn; Frank D. Marks Jr.

465

Direct Estimation of the Reynolds Stress Vertical Structure in the Nearshore  

Science Conference Proceedings (OSTI)

Measurements of the vertical Reynolds stress components in the wave-dominated nearshore are required to diagnose momentum and turbulence dynamics. Removing wave bias from Reynolds stress estimates is critical to a successful diagnosis. Here two ...

Falk Feddersen; A. J. Williams III

2007-01-01T23:59:59.000Z

466

Analytical Expressions for Doppler Spectra of Scatter from Hydrometeors Observed with a Vertically Directed Radar Beam  

Science Conference Proceedings (OSTI)

A generalized expression is derived for the correlation function of signals backscattered from hydrometeors observed with a vertically pointed radar beam in which particle size distribution, turbulence, and mean wind are not homogeneous. This ...

Ming Fang; Richard J. Doviak; Bruce A. Albrecht

2012-04-01T23:59:59.000Z

467

Seasonal Variations in the Vertically Integrated Water Vapor Transport Fields over the Southern Hemisphere  

Science Conference Proceedings (OSTI)

Seasonal mean fields of precipitable water and the zonal and meridional components of the vertically integrated atmospheric water vapor transport fields are calculated from five years of Southern Hemisphere data (1 September 1973 through 31 ...

David A. Howarth

1983-06-01T23:59:59.000Z

468

A technique to measure turbulent free convective heat transfer in a vertical tall cavity.  

E-Print Network (OSTI)

??A time-average technique was developed to measure the unsteady and turbulent free convection heat transfer in tall vertical enclosure using a Mach-Zehnder interferometer. The method… (more)

Poulad, Mohammad Ebrahim

2009-01-01T23:59:59.000Z

469

Improving Multimodel Forecasts of the Vertical Distribution of Heating Using the TRMM Profiles  

Science Conference Proceedings (OSTI)

Recently the National Aeronautics and Space Administration (NASA) Tropical Rainfall Measuring Mission (TRMM) project office made available a new product called the convective–stratiform heating (CSH). These are the datasets for vertical profiles ...

T. N. Krishnamurti; Arindam Chakraborty; A. K. Mishra

2010-03-01T23:59:59.000Z

470

Near-Tropopause Vertical Motion within the Trailing Stratiform Region of a Midlatitude Squall Line  

Science Conference Proceedings (OSTI)

Rawinsonde observations have been used to determine the flow structure in the vicinity of the tropopause atop the trailing stratiform precipitation region of an intense midlatitude squall line. Computations of vertical motion using the kinematic ...

Richard H. Johnson; William A. Gallus Jr.; Michael D. Vescio

1990-09-01T23:59:59.000Z

471

A Vertical Coordinate Mapping Technique for Semispectral Primitive Equation Models of Oceanic Circulation  

Science Conference Proceedings (OSTI)

A stretched coordinate technique for semispectral hydrodynamic models is described that allows for greater flexibility in the placement of model grid points. Stretching is implemented here for the vertical coordinate of an oceanic model that ...

Albert J. Hermann; Hsiao-Ming Hsu

1993-06-01T23:59:59.000Z

472

On the Impact of WRF Model Vertical Grid Resolution on Midwest Summer Rainfall Forecasts  

Science Conference Proceedings (OSTI)

Weather Research and Forecast (WRF) model exploratory sensitivity simulations were performed to determine the impact of vertical grid resolution (VGR) on the forecast skill of Midwest summer rainfall. Varying the VGR indicated that a refined VGR, ...

Eric A. Aligo; William A. Gallus Jr.; Moti Segal

2009-04-01T23:59:59.000Z

473

A Cloud-Resolving Model with an Adaptive Vertical Grid for Boundary Layer Clouds  

Science Conference Proceedings (OSTI)

Accurate cloud-resolving model simulations of cloud cover and cloud water content for boundary layer clouds are difficult to achieve without vertical grid spacing well below 100 m, especially for inversion-topped stratocumulus. The need for fine ...

Roger Marchand; Thomas Ackerman

2011-05-01T23:59:59.000Z

474

An Evaluation and Comparison of Vertical Profile Data from the VISSR Atmospheric Sounder (VAS)  

Science Conference Proceedings (OSTI)

Statistical procedures are used to compare vertical profiles of temperature and moisture derived from VAS with three different algorithms to those of corresponding rawinsonde measurements for a clear-cold environment. To account for time and ...

Gary J. Jedlovec

1985-12-01T23:59:59.000Z

475

Vertical Motion Structure in Maritime continent mesoscale Convective Systems: Results from a 50-MHz Profiler  

Science Conference Proceedings (OSTI)

Wind profiler data wore used to determine the vertical motion structure in four tropical mcsoscale convective systems (MCSs), which occurred during the Down Under Doppler and Electricity Experiment (DUNDEE) near Darwin. Northern Territory, ...

Robert Cifelli; Steven A. Rutledge

1994-09-01T23:59:59.000Z

476

Sources of Gravity Wave Activity Seen in the Vertical Velocities Observed by the Flatland VHF Radar  

Science Conference Proceedings (OSTI)

Observations of vertical velocity made with the Flatland VHF radar located in the extremely flat terrain near Champaign, Illinois, are used to study sources of enhanced variance. The variance is used as an indicator of gravity wave activity. In ...

G. D. Nastrom; M. R. Peterson; J. L. Green; K. S. Gage; T. E. VanZandt

1990-08-01T23:59:59.000Z

477

Buoyancy of Convective Vertical Motions in the Inner Core of Intense Hurricanes. Part II: Case Studies  

Science Conference Proceedings (OSTI)

This is the second of two papers on the buoyancy of convective vertical motions in the inner core of intense hurricanes. This paper uses extensive airborne radar, dropwindsonde, and flight-level observations in Hurricanes Guillermo (1997) and ...

Matthew D. Eastin; William M. Gray; Peter G. Black

2005-01-01T23:59:59.000Z

478

Attenuation-Based Estimates of Rainfall Rates Aloft with Vertically Pointing Ka-Band Radars  

Science Conference Proceedings (OSTI)

An approach is suggested to retrieve low-resolution rainfall rate profiles and layer-averaged rainfall rates, Ra, from radar reflectivity measurements made by vertically pointing Ka-band radars. This approach is based on the effects of ...

Sergey Y. Matrosov

2005-01-01T23:59:59.000Z

479

Bottom Stress Estimates from Vertical Dissipation Rate Profiles on the Continental Shelf  

Science Conference Proceedings (OSTI)

Measurements of the near-bottom distribution of the turbulent dissipation rate on the continental shelf west of Vancouver Island are used to calculate bottom stress. A free-failing vertical profiler with microstructure shear probes was used to ...

Richard K. Dewey; William R. Crawford

1988-08-01T23:59:59.000Z

480

On the Ocean’s Large-Scale Circulation near the Limit of No Vertical Mixing  

Science Conference Proceedings (OSTI)

By convention, the ocean’s large-scale circulation is assumed to be a thermohaline overturning driven by the addition and extraction of buoyancy at the surface and vertical mixing in the interior. Previous work suggests that the overturning ...

J. R. Toggweiler; B. Samuels

1998-09-01T23:59:59.000Z

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


481

Vertical Motion Evaluation of a Colorado Snowstorm from a Synoptician's Perspective  

Science Conference Proceedings (OSTI)

The causes of vertical motions associated with a September snowstorm which resulted in a heavy snowband in northeastern Colorado have been examined from a synoptician's perspective. The aim of the examination is to look at the various causes of ...

Lawrence B. Dunn

1988-12-01T23:59:59.000Z

482

The Radiative Damping of Short Vertical Scale Waves in the Mesosphere  

Science Conference Proceedings (OSTI)

The mesospheric radiative damping rates for temperature perturbations with vertical wavelengths less than 6 km are calculated, based on previous works of Spiegel and Fels. Effects due to the breakdown of local thermodynamic equilibrium are ...

Stephen B. Fels

1984-05-01T23:59:59.000Z

483

The Effect of Reflecting Surfaces on the Vertical Structure and Variability of Stratospheric Planetary Waves  

Science Conference Proceedings (OSTI)

The effects of an upper-stratospheric reflecting surface on the vertical structure of stratospheric planetary waves are considered. A diagnostic of the basic-state wave propagation characteristics, which is particularly useful for determining the ...

Nili Harnik; Richard S. Lindzen

2001-10-01T23:59:59.000Z

484

Low-Frequency Equatorial Waves in Vertically Sheared Zonal Flow. Part I: Stable Waves  

Science Conference Proceedings (OSTI)

The mechanism by which a vertically sheared zonal flow affects large-scale, low-frequency equatorial waves is investigated with two-level equatorial,?-plane and spherical coordinates models.

Bin Wang; Xiaosu Xie

1996-02-01T23:59:59.000Z

485

Vertical Tracer Concentration Profiles Measured during the Joint Urban 2003 Dispersion Study  

Science Conference Proceedings (OSTI)

An atmospheric tracer dispersion study known as Joint Urban 2003 was conducted in Oklahoma City, Oklahoma, during July of 2003. As part of this field program, vertical concentration profiles were measured at approximately 1 km from the downtown ...

Julia E. Flaherty; Brian Lamb; K. Jerry Allwine; Eugene Allwine

2007-12-01T23:59:59.000Z

486

Estimating the Vertical Structure of Intense Mediterranean Precipitation Using Two X-Band Weather Radar Systems  

Science Conference Proceedings (OSTI)

The present study aims at a preliminary approach of multiradar compositing applied to the estimation of the vertical structure of precipitation—an important issue for radar rainfall measurement and prediction. During the HYDROMET Integrated Radar ...

A. Berne; G. Delrieu; H. Andrieu

2005-11-01T23:59:59.000Z

487

Correction of Polarimetric Radar Reflectivity Measurements and Rainfall Estimates for Apparent Vertical Profile in Stratiform Rain  

Science Conference Proceedings (OSTI)

A method for correcting the vertical profile of reflectivity measurements and rainfall estimates (VPR) in plan position indicator (PPI) scans of polarimetric weather radars in the melting layer and the snow layer during stratiform rain is ...

John Kalogiros; Marios N. Anagnostou; Emmanouil N. Anagnostou; Mario Montopoli; Errico Picciotti; Frank S. Marzano

2013-05-01T23:59:59.000Z

488

The Effects of Vertical Wind Shear on the Distribution of Convection in Tropical Cyclones  

Science Conference Proceedings (OSTI)

The influence of vertical wind shear on the azimuthal distribution of cloud-to-ground lightning in tropical cyclones was examined using flash locations from the National Lightning Detection Network. The study covers 35 Atlantic basin tropical ...

Kristen L. Corbosiero; John Molinari

2002-08-01T23:59:59.000Z

489

Large-Scale Vertical Eddy Diffusion in the Main Pycnocline of the Central North Pacific  

Science Conference Proceedings (OSTI)

Indirect procedures are used to estimate the latitudinal distribution of the large-scale vertical eddy diffusivity coefficient in the main pycnocline from the interannual change in T?, ?? structure of the water column in the central midlatitude ...

Warren White; Robert Bernstein

1981-04-01T23:59:59.000Z

490

Vertical Heat Transport by the Ocean Circulation and the Role of Mechanical and Haline Forcing  

Science Conference Proceedings (OSTI)

Vertical transport of heat by the ocean circulation is investigated using a coupled-climate model and novel thermodynamic methods. Using a streamfunction in temperature-depth coordinates, cells are identified by whether they are thermally direct (...

Jan D. Zika; Willem P. Sijp; Matthew H. England

491

Use of a Vertical Vorticity Equation in Variational Dual-Doppler Wind Analysis  

Science Conference Proceedings (OSTI)

The utility of the anelastic vertical vorticity equation in a weak-constraint (least squares error) variational dual-Doppler wind analysis procedure is explored. The analysis winds are obtained by minimizing a cost function accounting for the ...

Alan Shapiro; Corey K. Potvin; Jidong Gao

2009-10-01T23:59:59.000Z

492

The Use of Simultaneous Horizontal and Vertical Transmissions for Dual-Polarization Radar Meteorological Observations  

Science Conference Proceedings (OSTI)

Observations are presented in which the standard dual-polarization meteorological quantities (ZDR, dp, and ?HV) are determined from simultaneous horizontal (H) and vertical (V) transmissions. The return signals are measured in parallel H and V ...

Richard D. Scott; Paul R. Krehbiel; William Rison

2001-04-01T23:59:59.000Z

493

An iterative method for single and vertically stacked semiconductor quantum dots simulation  

Science Conference Proceedings (OSTI)

We present in this paper a computational effective nonlinear iterative method for calculating the electron energy spectra in single and vertically stacked InAs/GaAs semiconductor quantum dots. The physical model problem is formulated with the effective ... Keywords: Coupling effect, Electronic structure, Energy spectra, Modelling and simulation, Multishift QR method, Nonlinear eigenvalue problem, Semiconductor nanostructure, Single quantum dot, Vertically stacked quantum dot, Wave function

Yiming Li

2005-10-01T23:59:59.000Z

494

Transformation of Dual-Polarized Radar Measurements to Arbitrary Polarization Bases  

Science Conference Proceedings (OSTI)

A fully polarimetric radar system consists of an orthogonal dual-polarized transmission mode and a dual-channel receive mode that are typically set to be copolar and cross polar to the transmit state of polarization. The transmit polarization ...

V. Chandrasekar; J. Hubbert; V. N. Bringi; P. F. Meischner

1994-08-01T23:59:59.000Z

495

Outage Performance of Dual-Hop AF Relay Channels with Co-Channel Interferences over Rayleigh Fading  

Science Conference Proceedings (OSTI)

This paper studies the outage performance of a dual-hop amplify-and-forward (AF) relay fading channel in an interference-limited environment. The relay and destination nodes are corrupted by multiple co-channel Rayleigh interferences. New exact closed-form ... Keywords: Amplify and-forward relay, Co-channel interference, Nonregenerative relay, Outage probability, Rayleigh fading

Aleksandra M. Cvetkovi?; Dejan N. Mili?; Aleksandar S. Cvetkovi?; Mihajlo Stefanovi?

2013-06-01T23:59:59.000Z

496

Staggered array of explosives for fragmented oil shale formation toward a vertical free face  

SciTech Connect

Oil shale formation is explosively expanded toward a limited void volume for forming an in situ oil shale retort in a subterranean formation containing oil shale. In one embodiment, a void in the form of a vertical slot is excavated within a retort site, leaving at least one portion of unfragmented formation within the retort site adjacent to a vertical free face of the slot. Explosive is placed in at least two rows of vertical blasting holes in the remaining portion of unfragmented formation adjacent the vertical free face. The blasting holes in each row are mutually spaced apart along the length of the slot and longitudinally offset from blasting holes in the next adjacent row, and the row of blasting holes extends generally parallel to the vertical free face. Explosive in the blasting holes is detonated in a time delay sequence starting near one end of the slot and progressing along the length of the slot for explosively expanding formation in the remaining portion of unfragmented formation toward the vertical free face for forming a fragmented permeable mass of formation particles containing oil shale in an in situ oil shale retort.

Hutchins, N.M.; Studebaker, I.G.

1980-03-25T23:59:59.000Z

497

Method of detonating explosives for fragmenting oil shale formation toward a vertical free face  

SciTech Connect

An oil shale formation is explosively expanded toward a limited void volume for forming an in situ oil shale retort in a subterranean formation. A void in the form of a narrow vertical slot is excavated within a retort site, leaving at least one portion of unfragmented formation within the retort site adjacent a vertical free face of the slot. Explosive is placed in a row of vertical blasting holes in the remaining portion of unfragmented formation adjacent the vertical free face. The blasting holes are mutually spaced apart along the length of the slot, and the row of blasting holes extends parallel to the vertical free face. Explosive in the blasting holes is detonated in a time delay sequence starting near one end of the slot and progressing along the length of the slot for explosively expanding the formation in the vertical free face. A fragmented permeable mass of formation particles containing oil shale is formed in an in situ oil shale retort. 34 claims.

Hutchins, N.M.; Ridley, R.D.

1980-07-01T23:59:59.000Z

498

Staggered array of explosives for fragmented oil shale formation toward a vertical free face  

SciTech Connect

Oil shale formation is explosively expanded toward a limited void volume for forming an in situ oil shale retort in a subterranean formation containing oil shale. In one embodiment, a void in the form of a vertical slot is excavated within a retort site, leaving at least one portion of unfragmented formation within the retort site adjacent a vertical free face of the slot. Explosive is placed in at least 2 rows of vertical blasting holes in the remaining portion of unfragmented formation adjacent the vertical free face. The blasting holes in each row are mutually spaced apart along the length of the slot and longitudinally offset from blasting holes in the next adjacent row, and the row of blasting holes extends generally parallel to the vertical free face. Explosive in the blasting holes is detonated in a time delay sequence starting near one end of the slot and progressing along the length of the slot for explosively expanding formation in the remaining portion of unfragmented formation toward the vertical free face for forming a fragmented permeable mass of formation particles containing oil shale in an in situ oil shale retort. 31 claims.

Studebaker, I.G.; Hutchins, N.M.

1980-03-25T23:59:59.000Z

499

Method and apparatus for determining vertical heat flux of geothermal field  

DOE Patents (OSTI)

A method and apparatus for determining vertical heat flux of a geothermal field, and mapping the entire field, is based upon an elongated heat-flux transducer (10) comprised of a length of tubing (12) of relatively low thermal conductivity with a thermopile (20) inside for measuring the thermal gradient between the ends of the transducer after it has been positioned in a borehole for a period sufficient for the tube to reach thermal equilibrium. The transducer is thermally coupled to the surrounding earth by a fluid annulus, preferably water or mud. A second transducer comprised of a length of tubing of relatively high thermal conductivity is used for a second thermal gradient measurement. The ratio of the first measurement to the second is then used to determine the earth's thermal conductivity, k.sub..infin., from a precalculated graph, and using the value of thermal conductivity thus determined, then determining the vertical earth temperature gradient, b, from predetermined steady state heat balance equations which relate the undisturbed vertical earth temperature distributions at some distance from the borehole and earth thermal conductivity to the temperature gradients in the transducers and their thermal conductivity. The product of the earth's thermal conductivity, k.sub..infin., and the earth's undisturbed vertical temperature gradient, b, then determines the earth's vertical heat flux. The process can be repeated many times for boreholes of a geothermal field to map vertical heat flux.

Poppendiek, Heinz F. (LaJolla, CA)

1982-01-01T23:59:59.000Z

500

Gas-liquid two phase flow through a vertical 90 elbow bend  

SciTech Connect

Pressure drop data are reported for two phase air-water flow through a vertical to horizontal 90 elbow bend set in 0.026 m i.d. pipe. The pressure drop in the vertical inlet tangent showed some significant differences to that found for straight vertical pipe. This was caused by the elbow bend partially choking the inflow resulting in a build-up of pressure and liquid in the vertical inlet riser and differences in the structure of the flow regimes when compared to the straight vertical pipe. The horizontal outlet tangent by contrast gave data in general agreement with literature even to exhibiting a drag reduction region at low liquid rates and gas velocities between 1 and 2 m s{sup -1}. The elbow bend pressure drop was best correlated in terms of l{sub e}/d determined using the actual pressure loss in the inlet vertical riser. The data showed a general increase with fluid rates that tapered off at high fluid rates and exhibited a negative pressure region at low rates. The latter was attributed to the flow being smoothly accommodated by the bend when it passed from slug flow in the riser to smooth stratified flow in the outlet tangent. A general correlation was presented for the elbow bend pressure drop in terms of total Reynolds numbers. A modified Lockhart-Martinelli model gave prediction of the data. (author)

Spedding, P.L.; Benard, E. [School of Aeronautical Engineering, Queen's University Belfast, BT9 5AH (United Kingdom)

2007-07-15T23:59:59.000Z