Sample records for longwave broadband downwelling

  1. Assessment of clear and cloudy sky parameterizations for daily downwelling longwave radiation over different land surfaces in

    E-Print Network [OSTI]

    meteorological data, resulting in reliable quantification of net radiation and evapotranspiration in FloridaAssessment of clear and cloudy sky parameterizations for daily downwelling longwave radiation over sky downwelling longwave radiation (Rldc) and cloudy sky downwelling longwave radiation (Rld) formulas

  2. ARM - Measurement - Longwave broadband downwelling irradiance

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadap Documentation TDMADAP : XDC documentationBarrow,icegovMeasurementsLightning stroke

  3. ARM: Broadband Radiometer Station (BRS) broadband shortwave and longwave 1-min radiation data with Dutton correction

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

    Stoffel, Tom; Kay, Bev; Habte, Aron; Anderberg, Mary; Kutchenreiter, Mark

    Broadband Radiometer Station (BRS) broadband shortwave and longwave 1-min radiation data with Dutton correction

  4. ARM - Measurement - Shortwave broadband total downwelling irradiance

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadap Documentation TDMADAP : XDCnarrowband upwellingpolarization ARMdownwellingtotal downwelling

  5. ARM - Measurement - Shortwave broadband diffuse downwelling irradiance

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadap Documentation TDMADAP : XDCnarrowband upwellingpolarization ARM

  6. ARM - Measurement - Shortwave broadband direct downwelling irradiance

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadap Documentation TDMADAP : XDCnarrowband upwellingpolarization ARMdownwelling irradiance ARM

  7. ARM - Measurement - Longwave broadband net irradiance

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadap Documentation TDMADAP : XDC documentationBarrow,icegovMeasurementsLightning strokenet

  8. ARM - Measurement - Longwave broadband upwelling irradiance

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadap Documentation TDMADAP : XDC documentationBarrow,icegovMeasurementsLightning

  9. Investigation of the Downwelling LW Differences Between the Niamey AMF Main and Supplementary Sites

    SciTech Connect (OSTI)

    CN Long; P Gotseff; EG Dutton

    2008-04-01T23:59:59.000Z

    The overall average downwelling longwave (LW) measured at the Niamey supplementary facility (S1) is 6-8 Wm-2 less than that measured by the two instruments located at the ARM Mobile Facility (AMF) main (N1) site. Examination of all other data available at both sites does not reveal any overarching differences that suggest this should be the case. However, examination of the pyrgeometer case and dome temperatures do suggest that the S1 values are also anomalously low, which in turn would explain the downwelling LW anomaly since the LW is calculated using these temperatures. Our recommendation then is to normalize the S1 data to the average N1 value by applying an adjustment factor to the S1 downwelling pyrgeometer case and dome temperatures (in Kelvin), then recalculating the downwelling LW values. The adjustment factor (0.00305) has been determined as that factor that brings the overall average S1 LWdn to agree with the overall average of the two N1 LWdn data series. We note that there is no reason to expect that the two site averages would actually be exactly equal to one another, and thus our recommendation is viewed as likely moving the S1 data in the right direction and by normalizing to the N1 average will help facilitate more meaningful temporal variability studies at least. It is also strongly recommended that for all future AMF deployments where supplementary sites will also be deployed, that the supplementary instrument systems (complete) be assembled as they will be operated in the field and run for at least a few days beside the corresponding AMF main site instruments, both at the beginning and end of the AMF field campaign. This is absolutely crucial so that all the measurements can be compared pre- and post-experiment to properly relate these measurements and systems, and to detect measurement anomalies such as those discussed in this report.

  10. ARM - Measurement - Shortwave spectral diffuse downwelling irradiance

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadap Documentation TDMADAP : XDCnarrowband upwellingpolarizationupwellingdiffuse downwelling

  11. ARM - Measurement - Shortwave spectral total downwelling irradiance

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadap Documentation TDMADAP : XDCnarrowband upwellingpolarizationupwellingdiffusetotal downwelling

  12. A 20-Year Dataset of Downwelling Longwave Flux at the Arctic Surface from TOVS Satellite Data

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of ScienceandMesa del(ANL-IN-03-032) -Less isNFebruaryOctober 2, AlgeriaQ1 Q2 Q3 Ut NOTICE20-Year Dataset

  13. ARM: SIRS: derived, correction of downwelling shortwave diffuse hemispheric measurements using Dutton and full algorithm

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

    Stoffel, Tom; Kay, Bev; Habte, Aron; Anderberg, Mary; Kutchenreiter, Mark

    SIRS: derived, correction of downwelling shortwave diffuse hemispheric measurements using Dutton and full algorithm

  14. Broadband Longwave Radiative Cooling Rates in Inhomogeneous Stratocumulus Clouds

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office511041clothAdvanced Materials Advanced Materials FindAdvanced MaterialsDepartmentBrinkman AddressesA

  15. Solar and Infrared Radiation Station (SIRS) Handbook

    SciTech Connect (OSTI)

    Stoffel, T

    2005-07-01T23:59:59.000Z

    The Solar Infrared Radiation Station (SIRS) provides continuous measurements of broadband shortwave (solar) and longwave (atmospheric or infrared) irradiances for downwelling and upwelling components. The following six irradiance measurements are collected from a network of stations to help determine the total radiative flux exchange within the Atmospheric Radiation Measurement (ARM) Southern Great Plains (SGP) Climate Research Facility: • Direct normal shortwave (solar beam) • Diffuse horizontal shortwave (sky) • Global horizontal shortwave (total hemispheric) • Upwelling shortwave (reflected) • Downwelling longwave (atmospheric infrared) • Upwelling longwave (surface infrared)

  16. atmospheric longwave radiation: Topics by E-print Network

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

    Summary: 72010 1 The atmosphere absorbs part of the outgoing longwave energy Incoming solar radiation; Aerosol effects from IPCC 2001; CO2+ The Greenhouse Effect The White House...

  17. Use of OCA and APOLLO in Heliosat-4 method for the assessment of surface downwelling solar irradiance

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    the German Aerospace Center (DLR), for the assessment of surface downwelling solar irradiance (SSI). Each-based assessments of surface downwelling solar irradiance (SSI) are more and more used in the domain of solar energy, diffuse and direct surface irradiance for use in various domains: solar energy, biomass, agriculture

  18. Radiative and microphysical properties of Arctic stratus clouds from multiangle downwelling infrared radiances

    E-Print Network [OSTI]

    Shupe, Matthew

    climate is strongly influenced by an extensive and persistent pattern of cloud cover [Francis, 1997 properties can have significant effects on long- wave radiation, which dominates the radiation energy budgetRadiative and microphysical properties of Arctic stratus clouds from multiangle downwelling

  19. Broadband radiometer

    DOE Patents [OSTI]

    Cannon, T.W.

    1994-07-26T23:59:59.000Z

    A broadband radiometer is disclosed including (a) an optical integrating sphere having generally spherical integrating chamber and an entry port for receiving light (e.g., having visible and ultraviolet fractions), (b) a first optical radiation detector for receiving light from the sphere and producing an electrical output signal corresponding to broadband radiation, (c) a second optical radiation detector for receiving light from the sphere and producing an electrical output signal corresponding to a predetermined wavelength fraction of the broadband radiation, and (d) an output for producing an electrical signal which is proportional to the difference between the two electrical output signals. The radiometer is very useful, for example, in measuring the absolute amount of ultraviolet light present in a given light sample. 8 figs.

  20. Evaluation of Arctic Broadband Surface Radiation Measurements

    SciTech Connect (OSTI)

    Matsui, N.; Long, Charles N.; Augustine, J. A.; Halliwell, D.; Uttal, Taneil; Longenecker, D.; Niebergale, J.; Wendell, J.; Albee, R.

    2012-02-24T23:59:59.000Z

    The Arctic is a challenging environment for making in-situ radiation measurements. A standard suite of radiation sensors is typically designed to measure the total, direct and diffuse components of incoming and outgoing broadband shortwave (SW) and broadband thermal infrared, or longwave (LW) radiation. Enhancements can include various sensors for measuring irradiance in various narrower bandwidths. Many solar radiation/thermal infrared flux sensors utilize protective glass domes and some are mounted on complex mechanical platforms (solar trackers) that rotate sensors and shading devices that track the sun. High quality measurements require striking a balance between locating sensors in a pristine undisturbed location free of artificial blockage (such as buildings and towers) and providing accessibility to allow operators to clean and maintain the instruments. Three significant sources of erroneous data include solar tracker malfunctions, rime/frost/snow deposition on the instruments and operational problems due to limited operator access in extreme weather conditions. In this study, a comparison is made between the global and component sum (direct [vertical component] + diffuse) shortwave measurements. The difference between these two quantities (that theoretically should be zero) is used to illustrate the magnitude and seasonality of radiation flux measurement problems. The problem of rime/frost/snow deposition is investigated in more detail for one case study utilizing both shortwave and longwave measurements. Solutions to these operational problems are proposed that utilize measurement redundancy, more sophisticated heating and ventilation strategies and a more systematic program of operational support and subsequent data quality protocols.

  1. Inconsistencies between satellite estimates of longwave cloud forcing and dynamical fields from reanalyses

    E-Print Network [OSTI]

    Allan, Richard P.

    of cloud cover. We argue that monthly mean clear-sky outgoing longwave radiation (OLRc) measurements] The greenhouse effect of cloud may be quantified as the difference between outgoing longwave radiation (OLR longwave radiative effect is made which is directly comparable with standard climate model diagnostics

  2. 2006 Nature Publishing Group A climatologically significant aerosol longwave

    E-Print Network [OSTI]

    reinforcements including ice­albedo and cloud­radiation feedbacks6 . The importance of cloud­radiation (refs 7, 8). These studies have established that clouds, via the dominance of longwave radiation, exert clouds, in a process known as the `first indirect' effect11,12 . Under frequently occurring cloud types

  3. NOTES AND CORRESPONDENCE An Analytic Longwave Radiation Formula for Liquid Layer Clouds

    E-Print Network [OSTI]

    NOTES AND CORRESPONDENCE An Analytic Longwave Radiation Formula for Liquid Layer Clouds VINCENT E of boundary layer clouds have used a convenient but idealized longwave radiation formula for clouds in their large-eddy simulations (LESs). Under what conditions is this formula justified? Can it be extended

  4. THREE-DIMENSIONAL LONGWAVE INFRARED (LWIR) SYNTHETIC IMAGE GENERATION INCORPORATING ANGULAR EMJSSWITY EFFECTS USING RAY-

    E-Print Network [OSTI]

    Salvaggio, Carl

    . These routines require a sequence of images to evaluate tracking algorithms. The evaluation of sensor performanceTHREE-DIMENSIONAL LONGWAVE INFRARED (LWIR) SYNTHETIC IMAGE GENERATION INCORPORATING ANGULAR Memorial Drive Rochester, New York 14623-0887 ABSTRAO A technique for longwave infrared (LWIR) synthetic

  5. Comparison of Long-Wave Infrared Imaging and Visible/Near-Infrared Imaging of Vegetation for

    E-Print Network [OSTI]

    Lawrence, Rick L.

    Comparison of Long-Wave Infrared Imaging and Visible/Near-Infrared Imaging of Vegetation using spectral imaging. This has been accom- plished with both visible/near-infrared (Vis/NIR) sunlight reflection and long-wave infrared (LWIR) thermal emission. During a 4-week period in summer 2011

  6. A Highly Linear Broadband LNA

    E-Print Network [OSTI]

    Park, Joung Won

    2010-10-12T23:59:59.000Z

    In this work, a highly linear broadband Low Noise Amplifier (LNA) is presented. The linearity issue in broadband Radio Frequency (RF) front-end is introduced, followed by an analysis of the specifications and requirements of a broadband LNA through...

  7. Broadband Infrared Heterodyne Spectrometer: Final Report

    SciTech Connect (OSTI)

    Stevens, C G; Cunningham, C T; Tringe, J W

    2010-12-16T23:59:59.000Z

    This report summarizes the most important results of our effort to develop a new class of infrared spectrometers based on a novel broadband heterodyne design. Our results indicate that this approach could lead to a near-room temperature operation with performance limited only by quantum noise carried by the incoming signal. Using a model quantum-well infrared photodetector (QWIP), we demonstrated key performance features of our approach. For example, we directly measured the beat frequency signal generated by superimposing local oscillator (LO) light of one frequency and signal light of another through a spectrograph, by injecting the LO light at a laterally displaced input location. In parallel with the development of this novel spectrometer, we modeled a new approach to reducing detector volume though plasmonic resonance effects. Since dark current scales directly with detector volume, this ''photon compression'' can directly lead to lower currents. Our calculations indicate that dark current can be reduced by up to two orders of magnitude in an optimized ''superlens'' structure. Taken together, our spectrometer and dark current reduction strategies provide a promising path toward room temperature operation of a mid-wave and possibly long-wave infrared spectrometer.

  8. Variability in Long-Wave Runup as a Function of Nearshore Bathymetric Features

    E-Print Network [OSTI]

    Dunkin, Lauren M.

    2011-08-08T23:59:59.000Z

    wave setup and runup. The influence of bathymetric features on long-wave runup can be used in evaluating the vulnerability of coastal regions to erosion and dune overtopping, evaluating the changing morphology, and implementing plans to protect...

  9. Physica D 159 (2001) 3557 Wave group dynamics in weakly nonlinear long-wave models

    E-Print Network [OSTI]

    Pelinovsky, Dmitry

    Physica D 159 (2001) 35­57 Wave group dynamics in weakly nonlinear long-wave models Roger Grimshawa Communicated by A.C. Newell Abstract The dynamics of wave groups is studied for long waves, using the framework reserved. Keywords: Wave group dynamics; Korteweg­de Vries equation; Nonlinear Schr¨odinger equation 1

  10. Aerosol Effects on Cloud Emissivity and Surface Longwave Heating in the Arctic TIMOTHY J. GARRETT1,*

    E-Print Network [OSTI]

    ) studies show that in the Arctic cloud cover generally acts to warm the surface, while coolingAerosol Effects on Cloud Emissivity and Surface Longwave Heating in the Arctic TIMOTHY J. GARRETT1 in the atmosphere tend to increase the reflectance of solar (shortwave) radiation from water clouds, which can lead

  11. Long-wave infrared imaging of vegetation for detecting leaking CO2 gas

    E-Print Network [OSTI]

    Shaw, Joseph A.

    Long-wave infrared imaging of vegetation for detecting leaking CO2 gas Jennifer E. Johnson Joseph A for detecting leaking CO2 gas Jennifer E. Johnson,a Joseph A. Shaw,a Rick Lawrence,b Paul W. Nugent,a Laura M of these calibrated imagers is imaging of vegetation for CO2 gas leak detection. During a four-week period

  12. 1 JUNE 2000 1951A L L A N Evaluation of Simulated Clear-Sky Longwave Radiation Using

    E-Print Network [OSTI]

    Allan, Richard P.

    the clear-sky surface down- welling longwave irradiance (SDLc) to be an important amplifier of greenhouse). It is therefore important that SDLc is simulated adequately by climate models, particularly where the surface radiosonde profiles as input data. Model SDLc tended to be underestimated by about 5 W m 2 in comparison

  13. Version: 6/16/98 Keywords: wavy surface flow, finite element, longwave analysis, weakly-nonlinear analysis

    E-Print Network [OSTI]

    McCready, Mark J.

    Version: 6/16/98 Keywords: wavy surface flow, finite element, longwave analysis, weakly and drag are found, from finite element calculations, to increase as amplitude to approximately the third wavelength problem is solved numerically with a finite element formulation providing qualitative trends

  14. Broadband patterned magnetic microwave absorber

    SciTech Connect (OSTI)

    Li, Wei; Wu, Tianlong; Wang, Wei; Guan, Jianguo, E-mail: guanjg@whut.edu.cn [State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070 (China); Zhai, Pengcheng [School of Science, Wuhan University of Technology, Wuhan 430070 (China)

    2014-07-28T23:59:59.000Z

    It is a tough task to greatly improve the working bandwidth for the traditional flat microwave absorbers because of the restriction of available material parameters. In this work, a simple patterning method is proposed to drastically broaden the absorption bandwidth of a conventional magnetic absorber. As a demonstration, an ultra-broadband microwave absorber with more than 90% absorption in the frequency range of 4–40 GHz is designed and experimentally realized, which has a thin thickness of 3.7?mm and a light weight equivalent to a 2-mm-thick flat absorber. In such a patterned absorber, the broadband strong absorption is mainly originated from the simultaneous incorporation of multiple ?/4 resonances and edge diffraction effects. This work provides a facile route to greatly extend the microwave absorption bandwidth for the currently available absorbing materials.

  15. Broadband light-emitting diode

    DOE Patents [OSTI]

    Fritz, Ian J. (Albuquerque, NM); Klem, John F. (Sandia Park, NM); Hafich, Michael J. (Albuquerque, NM)

    1998-01-01T23:59:59.000Z

    A broadband light-emitting diode. The broadband light-emitting diode (LED) comprises a plurality of III-V compound semiconductor layers grown on a semiconductor substrate, with the semiconductor layers including a pair of cladding layers sandwiched about a strained-quantum-well active region having a plurality of different energy bandgaps for generating light in a wavelength range of about 1.3-2 .mu.m. In one embodiment of the present invention, the active region may comprise a first-grown quantum-well layer and a last-grown quantum-well layer that are oppositely strained; whereas in another embodiment of the invention, the active region is formed from a short-period superlattice structure (i.e. a pseudo alloy) comprising alternating thin layers of InGaAs and InGaAlAs. The use a short-period superlattice structure for the active region allows different layers within the active region to be simply and accurately grown by repetitively opening and closing one or more shutters in an MBE growth apparatus to repetitively switch between different growth states therein. The broadband LED may be formed as either a surface-emitting LED or as an edge-emitting LED for use in applications such as chemical sensing, fiber optic gyroscopes, wavelength-division-multiplexed (WDM) fiber-optic data links, and WDM fiber-optic sensor networks for automobiles and aircraft.

  16. Broadband light-emitting diode

    DOE Patents [OSTI]

    Fritz, I.J.; Klem, J.F.; Hafich, M.J.

    1998-07-14T23:59:59.000Z

    A broadband light-emitting diode is disclosed. The broadband light-emitting diode (LED) comprises a plurality of III-V compound semiconductor layers grown on a semiconductor substrate, with the semiconductor layers including a pair of cladding layers sandwiched about a strained-quantum-well active region having a plurality of different energy bandgaps for generating light in a wavelength range of about 1.3--2 {micro}m. In one embodiment of the present invention, the active region may comprise a first-grown quantum-well layer and a last-grown quantum-well layer that are oppositely strained; whereas in another embodiment of the invention, the active region is formed from a short-period superlattice structure (i.e. a pseudo alloy) comprising alternating thin layers of InGaAs and InGaAlAs. The use a short-period superlattice structure for the active region allows different layers within the active region to be simply and accurately grown by repetitively opening and closing one or more shutters in an MBE growth apparatus to repetitively switch between different growth states therein. The broadband LED may be formed as either a surface-emitting LED or as an edge-emitting LED for use in applications such as chemical sensing, fiber optic gyroscopes, wavelength-divisionmultiplexed (WDM) fiber-optic data links, and WDM fiber-optic sensor networks for automobiles and aircraft. 10 figs.

  17. Broad-band beam buncher

    DOE Patents [OSTI]

    Goldberg, David A. (Walnut Creek, CA); Flood, William S. (Berkeley, CA); Arthur, Allan A. (Martinez, CA); Voelker, Ferdinand (Orinda, CA)

    1986-01-01T23:59:59.000Z

    A broad-band beam buncher is disclosed, comprising an evacuated housing, an electron gun therein for producing an electron beam, a buncher cavity having entrance and exit openings through which the beam is directed, grids across such openings, a source providing a positive DC voltage between the cavity and the electron gun, a drift tube through which the electron beam travels in passing through such cavity, grids across the ends of such drift tube, gaps being provided between the drift tube grids and the entrance and exit grids, a modulator for supplying an ultrahigh frequency modulating signal to the drift tube for producing velocity modulation of the electrons in the beam, a drift space in the housing through which the velocity modulated electron beam travels and in which the beam is bunched, and a discharge opening from such drift tube and having a grid across such opening through which the bunched electron beam is discharged into an accelerator or the like. The buncher cavity and the drift tube may be arranged to constitute an extension of a coaxial transmission line which is employed to deliver the modulating signal from a signal source. The extended transmission line may be terminated in its characteristic impedance to afford a broad-band response and the device as a whole designed to effect broad-band beam coupling, so as to minimize variations of the output across the response band.

  18. Broadband solar absorption enhancement via periodic

    E-Print Network [OSTI]

    Province, 230009, P. R. China. Solution processed colloidal quantum dot (CQD) solar cells have greatBroadband solar absorption enhancement via periodic nanostructuring of electrodes Michael M. Adachi demonstrate a bottom- illuminated periodic nanostructured CQD solar cell that enhances broadband absorption

  19. Technical Considerations for Broadband Powerline (BPL) Communication

    E-Print Network [OSTI]

    Technical Considerations for Broadband Powerline (BPL) Communication Robert G. Olsen1 1 School of the electric power transmission and distribution system as a transmission medium for broadband communications for the unlicensed systems that use the power system as a communications medium. I. INTRODUCTION The possible use

  20. Characterizing Residential Broadband Networks Marcel Dischinger

    E-Print Network [OSTI]

    Saroiu, Stefan

    Characterizing Residential Broadband Networks Marcel Dischinger MPI for Software Systems mdischin and rapidly growing proportion of users connect to the Internet via residential broadband networks such as Dig- ital Subscriber Lines (DSL) and cable. Residential networks are often the bottleneck in the last mile

  1. The Development of Instrumentation and Methods for Measurement of Air-Sea Interaction and Coastal Processes from Manned and Unmanned Aircraft /

    E-Print Network [OSTI]

    Reineman, Benjamin D.

    2013-01-01T23:59:59.000Z

    T s is determined from the long-wave upwelling (Q LW ? ) andtakes long- and short-wave upwelling and downwelling

  2. Optically controlled delays for broadband pulses

    E-Print Network [OSTI]

    Sun, Q. Q.; Rostovtsev, Y. V.; Dowling, J. P.; Scully, Marlan O.; Zubairy, M. Suhail

    2005-01-01T23:59:59.000Z

    We propose a scheme that provides large controllable delays for broadband optical pulses. The system is based on the steep dispersion of a coherently driven medium, in which the narrow electromagnetically induced transparency (EIT) band is overcome...

  3. Development of ultra-broadband modulators

    E-Print Network [OSTI]

    Shamir, Orit A

    2008-01-01T23:59:59.000Z

    Optical signal modulation is a cornerstone of communication, allowing the transfer of information by electrically encoding data onto an optical carrier. Modulation with ultra-broadband capability enables the generation of ...

  4. A numerical approach : broadband technologies for efficient Magnetic Resonance Imaging

    E-Print Network [OSTI]

    Mitsouras, Dimitrios, 1976-

    2004-01-01T23:59:59.000Z

    (cont.) independent receiver coils in parallel or time-axis compression, can be cast as complementary to broadband MRI encoding. This affords broadband non-Fourier MRI with time efficiencies over current fast MRI methods. ...

  5. Municipal wireless mesh networks as a competitive broadband delivery platform

    E-Print Network [OSTI]

    Hassan-Ali, Mudhafar

    2007-01-01T23:59:59.000Z

    Recently there has been a growing interest in deploying Wireless Mesh Networks by municipalities. This interest stems from the desire to provide broadband connectivity to users lacking access to broadband alternatives. The ...

  6. Broadband diffractive lens or imaging element

    DOE Patents [OSTI]

    Ceglio, Natale M. (Livermore, CA); Hawryluk, Andrew M. (Modesto, CA); London, Richard A. (Oakland, CA); Seppala, Lynn G. (Livermore, CA)

    1991-01-01T23:59:59.000Z

    A broadband diffractive lens or imaging element produces a sharp focus and/or a high resolution image with broad bandwidth illuminating radiation. The diffractive lens is sectored or segmented into regions, each of which focuses or images a distinct narrowband of radiation but all of which have a common focal length. Alternatively, a serial stack of minus filters, each with a diffraction pattern which focuses or images a distinct narrowband of radiation but all of which have a common focal length, is used. The two approaches can be combined. Multifocal broadband diffractive elements can also be formed.

  7. Broadband diffractive lens or imaging element

    DOE Patents [OSTI]

    Ceglio, N.M.; Hawryluk, A.M.; London, R.A.; Seppala, L.G.

    1993-10-26T23:59:59.000Z

    A broadband diffractive lens or imaging element produces a sharp focus and/or a high resolution image with broad bandwidth illuminating radiation. The diffractive lens is sectored or segmented into regions, each of which focuses or images a distinct narrowband of radiation but all of which have a common focal length. Alternatively, a serial stack of minus filters, each with a diffraction pattern which focuses or images a distinct narrowband of radiation but all of which have a common focal length, is used. The two approaches can be combined. Multifocal broadband diffractive elements can also be formed. Thin film embodiments are described. 21 figures.

  8. Broadband diffractive lens or imaging element

    DOE Patents [OSTI]

    Ceglio, Natale M. (Livermore, CA); Hawryluk, Andrew M. (Modesto, CA); London, Richard A. (Oakland, CA); Seppala, Lynn G. (Livermore, CA)

    1993-01-01T23:59:59.000Z

    A broadband diffractive lens or imaging element produces a sharp focus and/or a high resolution image with broad bandwidth illuminating radiation. The diffractive lens is sectored or segmented into regions, each of which focuses or images a distinct narrowband of radiation but all of which have a common focal length. Alternatively, a serial stack of minus filters, each with a diffraction pattern which focuses or images a distinct narrowband of radiation but all of which have a common focal length, is used. The two approaches can be combined. Multifocal broadband diffractive elements can also be formed. Thin film embodiments are described.

  9. Quarterly Journal of the Royal Meteorological Society Q. J. R. Meteorol. Soc. 137: 11791192, July 2011 A Examination of long-wave radiative bias in general circulation

    E-Print Network [OSTI]

    Allan, Richard P.

    Environment Model (HiGEM), suggest that including mineral dust radiative effects removes this bias­21 June 2007, although differences in cloud cover also impact the model­GERB differences. Copyright c 2011 A Examination of long-wave radiative bias in general circulation models over North Africa during

  10. Broadband frequency mode entanglement in waveguided PDC

    E-Print Network [OSTI]

    Eckstein, Andreas

    2008-01-01T23:59:59.000Z

    We report the observation of beatings of the coincidence event rate in a Hong-Ou-Mandel interference (HOMI) between signal and idler photons from a parametric downconversion process inside a multi-mode KTP waveguide. As explanation we introduce bi-photonic states entangled in their broadband frequency modes and propose a suitable entanglement witness.

  11. Broadband frequency mode entanglement in waveguided PDC

    E-Print Network [OSTI]

    Andreas Eckstein; Christine Silberhorn

    2008-07-04T23:59:59.000Z

    We report the observation of beatings of the coincidence event rate in a Hong-Ou-Mandel interference (HOMI) between signal and idler photons from a parametric downconversion (PDC) process inside a multi-mode KTP waveguide. As explanation we introduce bi-photonic states entangled in their broadband frequency modes generated by waveguide mode triples and propose a suitable entanglement detection scheme.

  12. Broadband, Higher Education and Rural New Mexico

    E-Print Network [OSTI]

    Maccabe, Barney

    Broadband, Higher Education and Rural New Mexico Gil Gonzales, Ph.D., Chief Information Officer University of New Mexico, Albuquerque, NM 87131 E mail: gonzgil@unm.edu Background UNM students enjoy the country do. New Mexico is also home to two national laboratories in Los Alamos (Los Alamos National

  13. Integrated broadband bowtie antenna on transparent substrate

    E-Print Network [OSTI]

    Zhang, Xingyu; Subbaraman, Harish; Zhan, Qiwen; Pan, Zeyu; Chung, Chi-jui; Yan, Hai; Chen, Ray T

    2015-01-01T23:59:59.000Z

    The bowtie antenna is a topic of growing interest in recent years. In this paper, we design, fabricate, and characterize a modified gold bowtie antenna integrated on a transparent glass substrate. We numerically investigate the antenna characteristics, specifically its resonant frequency and enhancement factor. We simulate the dependence of resonance frequency on bowtie geometry, and verify the simulation results through experimental investigation, by fabricating different sets of bowtie antennas on glass substrates utilizing CMOS compatible processes and measuring their resonance frequencies. Our designed bowtie antenna provides a strong broadband electric field enhancement in its feed gap. The far-field radiation pattern of the bowtie antenna is measured, and it shows dipole-like characteristics with large beam width. Such a broadband antenna will be useful for a myriad of applications, ranging from wireless communications to electromagnetic wave detection.

  14. The frequency of tropopause-level thick and thin cirrus clouds as observed by CALIPSO and the relationship to relative humidity and outgoing longwave radiation

    E-Print Network [OSTI]

    Cardona, Allison Leanne

    2008-10-10T23:59:59.000Z

    THE FREQUENCY OF TROPOPAUSE-LEVEL THICK AND THIN CIRRUS CLOUDS AS OBSERVED BY CALIPSO AND THE RELATIONSHIP TO RELATIVE HUMIDITY AND OUTGOING LONGWAVE RADIATION A Thesis by ALLISON L. CARDONA Submitted to the Office of Graduate... Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE August 2008 Major Subject: Atmospheric Sciences THE FREQUENCY OF TROPOPAUSE-LEVEL THICK AND THIN CIRRUS CLOUDS AS OBSERVED...

  15. Implementing the National Broadband Plan by Empowering Consumers...

    Energy Savers [EERE]

    Privacy Implementing the National Broadband Plan by Empowering Consumers and the Smart Grid: Data Access, Third Party Use, and Privacy The United States Telecom Association...

  16. Re: DOE Request for Information - Implementing the National Broadband...

    Energy Savers [EERE]

    Implementing the National Broadband Plan by Studying the Communications Requirements of Electric Utilities To Inform Federal Smart Grid Policy (Federal RegisterVol.75, No.90...

  17. Re: DOE Request for Information - Implementing the National Broadband...

    Energy Savers [EERE]

    - Implementing the National Broadband Plan by Studying the Communications Requirements of Electric Utilities To Inform Federal Smart Grid Policy The Edison Electric Institute...

  18. Re: DOE Request for Information - Implementing the National Broadband...

    Energy Savers [EERE]

    Implementing the National Broadband Plan by Studying the Communications Requirements of Electric Utilities to Inform Federal Smart Grid Policy, which was published at 75 Federal...

  19. Re: DOE Request for Information - Implementing the National Broadband...

    Energy Savers [EERE]

    - Implementing the National Broadband Plan by Studying the Communications Requirements of Electric Utilities to Inform Federal Smart Grid Policy More Documents & Publications Re:...

  20. A Method for Broadband Full-Duplex MIMO Radio

    E-Print Network [OSTI]

    Hua, Yingbo; Liang, Ping; Ma, Yiming; Cirik, Ali C; Gao, Qian

    2012-01-01T23:59:59.000Z

    canceller for collocated radios,” IEEE Trans. Microwaveusing off-the shelf radios: Feasibility and first results,”Broadband Full-Duplex MIMO Radio Yingbo Hua, Fellow, IEEE,

  1. Re: Implementing the National Broadband Plan by Studying the...

    Office of Environmental Management (EM)

    Studying the Communications Requirements of Electric Utilities to Inform Federal Smart Grid Policy Re: Implementing the National Broadband Plan by Studying the Communications...

  2. Broadband Energy Networks Inc | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual Siteof EnergyInnovation in CarbonofBiotinsBostonBridger Valley ElecBroadband Energy

  3. A Programming Example: Large FFT on the Cell Broadband Engine

    E-Print Network [OSTI]

    Southern California, University of

    A Programming Example: Large FFT on the Cell Broadband Engine Alex Chunghen Chow IBM Corporation-core implementation of the Cell Broadband Engine Architecture (CBEA), including a 64-bit Power Processor Element (PPE) and eight Synergistic Processor Elements (SPEs). We apply this processor's computational power

  4. Deployment of Broadband Infrastructure in the Region of Western Greece

    E-Print Network [OSTI]

    Bouras, Christos

    Deployment of Broadband Infrastructure in the Region of Western Greece Antonios Alexiou1, Patras, Greece 3 University of Ioannina, Greece 4 University of Aegean, Greece {alexiua, bouras, igglesis that is taking place in the Region of Western Greece in order to develop state-of-the- art broadband

  5. Broadband proton-decoupled proton spectra Andrew J. Pell

    E-Print Network [OSTI]

    Keeler, James

    Broadband proton-decoupled proton spectra Andrew J. Pell , Richard A. E. Edden§ and James Keeler.ac.uk. #12;Abstract We present a new method for recording broadband proton-decoupled proton spectra with ab reduction in sensitivity when com- pared to a conventional proton spectrum. The method is demonstrated

  6. CMOS front-end amplifier for broadband DTV tuner

    E-Print Network [OSTI]

    Zhang, Guang

    2005-08-29T23:59:59.000Z

    In this work, the design of a CMOS broadband low noise amplifier with inherent high performance single-to-differential conversion is presented. These characteristics are driven by the double quadrature single conversion digital television tuner...

  7. Social Network Theory, Broadband and the World Wide Web

    E-Print Network [OSTI]

    Sgroi, Daniel

    2006-03-14T23:59:59.000Z

    This paper aims to predict some possible futures for the World Wide Web based on several key network parameters: size, complexity, cost and increasing connection speed thorough the uptake of broadband technology. This is done through the production...

  8. Electromagnetically induced transparency with broadband laser pulses D. D. Yavuz

    E-Print Network [OSTI]

    Yavuz, Deniz

    Electromagnetically induced transparency with broadband laser pulses D. D. Yavuz Department pulses inside an atomic medium using electromag- netically induced transparency. Extending the suggestion.65. k Over the last decade, counterintuitive optical effects using electromagnetically induced

  9. ARM - Measurement - Shortwave narrowband diffuse downwelling irradiance

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadap Documentation TDMADAP : XDCnarrowband upwellingpolarization

  10. ARM - Measurement - Shortwave narrowband direct downwelling irradiance

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadap Documentation TDMADAP : XDCnarrowband upwellingpolarizationupwelling irradiance ARM

  11. ARM - Measurement - Shortwave narrowband total downwelling irradiance

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadap Documentation TDMADAP : XDCnarrowband upwellingpolarizationupwelling irradiancedownwelling

  12. Broadband Dielectric Spectroscopy on Human Blood

    E-Print Network [OSTI]

    M. Wolf; R. Gulich; P. Lunkenheimer; A. Loidl

    2011-05-25T23:59:59.000Z

    Dielectric spectra of human blood reveal a rich variety of dynamic processes. Achieving a better characterization and understanding of these processes not only is of academic interest but also of high relevance for medical applications as, e.g., the determination of absorption rates of electromagnetic radiation by the human body. The dielectric properties of human blood are studied using broadband dielectric spectroscopy, systematically investigating the dependence on temperature and hematocrit value. By covering a frequency range from 1 Hz to 40 GHz, information on all the typical dispersion regions of biological matter is obtained. We find no evidence for a low-frequency relaxation (alpha-relaxation) caused, e.g., by counterion diffusion effects as reported for some types of biological matter. The analysis of a strong Maxwell-Wagner relaxation arising from the polarization of the cell membranes in the 1-100 MHz region (beta-relaxation) allows for the test of model predictions and the determination of various intrinsic cell properties. In the microwave region beyond 1 GHz, the reorientational motion of water molecules in the blood plasma leads to another relaxation feature (gamma-relaxation). Between beta- and gamma-relaxation, significant dispersion is observed, which, however, can be explained by a superposition of these relaxation processes and is not due to an additional delta-relaxation often found in biological matter. Our measurements provide dielectric data on human blood of so far unsurpassed precision for a broad parameter range. All data are provided in electronic form to serve as basis for the calculation of the absorption rate of electromagnetic radiation and other medical purposes. Moreover, by investigating an exceptionally broad frequency range, valuable new information on the dynamic processes in blood is obtained.

  13. System and method for detection of dispersed broadband signals

    DOE Patents [OSTI]

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

    1999-06-08T23:59:59.000Z

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

  14. System and method for detection of dispersed broadband signals

    DOE Patents [OSTI]

    Qian, S.; Dunham, M.E.

    1999-06-08T23:59:59.000Z

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

  15. The use of broadband microseisms for hydraulic fracture mapping

    SciTech Connect (OSTI)

    Sleefe, G.E.; Warpinski, N.R.; Engler, B.P.

    1993-08-01T23:59:59.000Z

    When a hydrocarbon reservoir is subjected to a hydraulic fracture treatment, the cracking and slipping of the formation results in the emission of seismic energy. The objective of this study was to determine the advantages of using broadband (100 Hz to 1500 M) microseismic emissions to map a hydraulic fracture treatment. A hydraulic fracture experiment was performed in the Piceance Basin of Western Colorado to induce and record broadband microseismic events. The formation was subjected to four processes; break-down/ballout, step-rate test, KCL mini-fracture, and linear-gel mini-fracture. Broadband microseisms were successfully recorded by a novel three-component wall-locked seismic accelerometer package, placed in an observation well 211 ft (64 m) offset from the treatment well. During the two hours of formation treatment, more than 1200 significant microseismic events were observed. The occurrences of the events strongly correlated with the injection bore-bole pressures during the treatments. Using both hodogram analysis and time of arrival information, estimates of the origination point of the seismic events were computed. A map of the event locations yielded a fracture orientation estimate consistent with the known orientation of the field in the formation. This paper describes the technique for acquiring and analyzing broadband microseismic events and illustrate how the new broadband approach can enhance signal detectability and event location resolution.

  16. Ship-based observation of drizzling stratocumulus clouds from EPIC to VOCALS Simon P. de Szoeke, Oregon State University, Corvallis, OR.

    E-Print Network [OSTI]

    Parker, Matthew D. Brown

    measured by instruments on a mast at the bow of the ship (de Szoeke et al. 2010). Radiometers measured downwelling solar and longwave thermal radiation. A scanning C-band radar measured reflectivity from

  17. Analog Baseband Filters and Mixed Signal Circuits for Broadband Receiver Systems

    E-Print Network [OSTI]

    Kulkarni, Raghavendra Laxman

    2012-02-14T23:59:59.000Z

    deals with broadband wireless receivers. With an objective to gain insight, we quantify the impact of undesired out-band blockers on analog baseband in a broadband radio. We present a systematic evaluation of the dynamic range requirements...

  18. An arrayed nanoantenna for broadband light emission and detection

    E-Print Network [OSTI]

    Miroshnichenko, Andrey E; Davoyan, Arthur R; Simovski, Constantin; Belov, Pavel; Kivshar, Yuri S

    2011-01-01T23:59:59.000Z

    We suggest a broadband optical unidirectional arrayed nanoantenna consisting of equally spaced nanorods of gradually varying length. Each nanorod can be driven by near-field quantum emitters radiating at different frequencies or, according to the reciprocity principle, by an incident light at the same frequency. Broadband unidirectional emission and reception characteristics of the nano-antenna open up novel opportunities for subwavelength light manipulation and quantum communication, as well as for enhancing the performance of photoactive devices such as photovoltaic detectors, light-emitting diodes, and solar cells.

  19. BROADBAND ANALOG OPTO-ELECTRONIC BLIND SOURCE SEPARATION

    E-Print Network [OSTI]

    Popovic, Zoya

    -electronic blind source separation Thesis directed by Professor Zoya Popovi´c This thesis addresses the problemBROADBAND ANALOG OPTO-ELECTRONIC BLIND SOURCE SEPARATION by PAUL CARSON SMITH B.E., University of Colorado, 2000 M.S., University of Colorado, 2000 A thesis submitted to the Faculty of the Graduate School

  20. New Frontiers in Solar Physics: Broadband Imaging Spectroscopy with the

    E-Print Network [OSTI]

    , the solar panel of the AASC recommended an integrated suite of instrumentation designed to meetNew Frontiers in Solar Physics: Broadband Imaging Spectroscopy with the Frequency Agile Solar and other astrophysical objects and processes. Outstanding problems in solar physics include the magnetic

  1. Broadband low-dispersion diffraction of femtosecond pulses

    E-Print Network [OSTI]

    Purdue University

    with that of a 100-fs pulse, which is ap- proximately 10 nm (or 5 THz) at 800 nm. The large bandwidths of ultrafast-bit-rate communications.12 Pulse shaping and control of ultrafast pulses are of interest not only from the practical point for femtosecond pulse shaping and ultrafast pulse switch- ing. Bandgap engineered broadband semiconductor MQW

  2. Broadband laser cooling of trapped atoms with ultrafast pulses

    E-Print Network [OSTI]

    Blinov, Boris

    Broadband laser cooling of trapped atoms with ultrafast pulses B. B. Blinov,* R. N. Kohn, Jr., M. J ions in an rf trap using ultrafast pulses from a mode-locked laser. The temperature of a single ion On the other hand, an ultrafast laser whose pulse is a few picoseconds long will naturally have a bandwidth

  3. BROADBAND IDENTIFICATION OF BATTERY ELECTRICAL IMPEDANCE FOR HEV

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    to perform impedance measurements on a battery cell. Moreover, spectral coherence is an advanced parameterBROADBAND IDENTIFICATION OF BATTERY ELECTRICAL IMPEDANCE FOR HEV R. Al-Nazer, V. Cattin, M. Montaru). In such applications, the most possible accurate estimation of the battery states is needed to optimize its operation

  4. The Fast Multipole Algorithm on the Cell Broadband Engine Architecture

    E-Print Network [OSTI]

    McCreath, Eric Charles

    The Fast Multipole Algorithm on the Cell Broadband Engine Architecture Christopher Fraser (u4395190 capability. One such algorithm is Greengard and Rohklin's Fast Multipole Algorithm (FMA), which computes potentials for groups of particles via multipole approximations. In this way, the number of computations

  5. Broadband microwave imaging spectroscopy with a solardedicated array

    E-Print Network [OSTI]

    the thermal structure of the solar atmosphere, and to study energy release and particle energization the range 1-- 26.5 GHz. Keywords: Radio interferometry, spectroscopy, optical fiber, correlator 1Broad­band microwave imaging spectroscopy with a solar­dedicated array T.S. Bastian a , D.E. Gary b

  6. Broadband municipal optical networks in Greece: A suitable business model

    E-Print Network [OSTI]

    Bouras, Christos

    Broadband municipal optical networks in Greece: A suitable business model Christos Bouras a, Greece b Research Academic Computer Technology Institute, N. Kazanzaki, University of Patras Campus, GR-26500 Rio, Greece c Department of Informatics, Aristotle University of Thessaloniki, PO Box 114, GR

  7. Traffic-Aware Video Streaming in Broadband Wireless Networks

    E-Print Network [OSTI]

    Ansari, Nirwan

    Traffic-Aware Video Streaming in Broadband Wireless Networks Ehsan Haghani and Nirwan Ansari Shyam in the Internet. Streaming real-time video in wireless networks is a challenging problem due to the stringent video quality at the end user in wireless networks. Our solution incorporates the characteristics

  8. EXPLOITING NONLINEARITY TO PROVIDE BROADBAND ENERGY HARVESTING Jeff Moehlis

    E-Print Network [OSTI]

    Moehlis, Jeff

    @engineering.ucsb.edu Barry E. DeMartini High Frequency Technology Center Agilent Technologies, Inc. Santa Rosa, CA 95403@engineering.ucsb.edu ABSTRACT Energy harvesters are a promising technology for capturing useful energy from the environmentEXPLOITING NONLINEARITY TO PROVIDE BROADBAND ENERGY HARVESTING Jeff Moehlis Department

  9. Justification for Acquisition and Use of Broadband Device Request Form

    E-Print Network [OSTI]

    Personal Use of NIH Information Technology (IT) Resources Policy (http://www3.od.nih.gov/oma/manualchapters/management Cellular Activation* AT&T Verizon T-Mobile Provide SIMM Card Number* *GO TO SETTINGS ­ GENERAL country. I will immediately report the loss or theft of my broadband device as outlined in the Managing

  10. Bandwidth assignment for reliable fixed broadband wireless Grit Claen

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    linear programming (ILP) counterparts. We further propose cutset-based valid inequalities to enhanceBandwidth assignment for reliable fixed broadband wireless networks Grit Claßen Lehrstuhl II f of data routing and bandwidth assignment that minimizes the total renewal fees of licenses. This problem

  11. Broadband dye-sensitized upconversion of near-infrared light

    E-Print Network [OSTI]

    Broadband dye-sensitized upconversion of near-infrared light Wenqiang Zou1 , Cindy Visser1-junction solar cell. However, the practical applicability of the most efficient known upconversion materials by the dye-sensitized nanoparticles is dramatically enhanced (by a factor of 3,300) as a result of increased

  12. Measuring storage and loss moduli using optical tweezers: broadband microrheology

    E-Print Network [OSTI]

    Manlio Tassieri; Graham M. Gibson; R. M. L. Evans; Alison M. Yao; Rebecca Warren; Miles J. Padgett; Jonathan M. Cooper

    2009-10-07T23:59:59.000Z

    We present an experimental procedure to perform broadband microrheological measurements with optical tweezers. A generalised Langevin equation is adopted to relate the time-dependent trajectory of a particle in an imposed flow to the frequency-dependent moduli of the complex fluid. This procedure allows us to measure the material linear viscoelastic properties across the widest frequency range achievable with optical tweezers.

  13. Dielectric nanostructures for broadband light trapping in organic solar cells

    E-Print Network [OSTI]

    Fan, Shanhui

    Dielectric nanostructures for broadband light trapping in organic solar cells Aaswath Raman, Zongfu@stanford.edu Abstract: Organic bulk heterojunction solar cells are a promising candidate for low-cost next lying on top of the organic solar cell stack produce a 8-15% increase in photocurrent for a model

  14. 126 June 2006 CHALLENGES FOR BROADBAND DEPLOYMENT IN INDIA

    E-Print Network [OSTI]

    Karandikar, Abhay

    Karandikar Department of Electrical Engineering Indian Institute of Technology-Bombay Mumbai karandi". It is expected that the "availability of broadband services at affordable price-levels will have significant of Metro Ethernet 226 June 2006 revenues to the extent of US$360 per year per household for 90

  15. Broadband laser polarization control with aligned carbon nanotubes

    E-Print Network [OSTI]

    Yang, He; Lia, Diao; Chen, Ya; Mattila, Marco; Tian, Ying; Yong, Zhenzhong; Yang, Changxi; Tittonen, Ilkka; Ren, Zhaoyu; Bai, Jingtao; Li, Qingwen; Kauppinen, Esko I; Lipsanen, Harri; Sun, Zhipei

    2015-01-01T23:59:59.000Z

    We introduce a simple approach to fabricate aligned carbon nanotube (ACNT) device for broadband polarization control in fiber laser systems. The ACNT device was fabricated by pulling from as-fabricated vertically-aligned carbon nanotube arrays. Their anisotropic property is confirmed with optical and scanning electron microscopy, and with polarized Raman and absorption spectroscopy. The device was then integrated into fiber laser systems (at two technologically important wavelengths of 1 and 1.5 um) for polarization control. We obtained a linearly-polarized light output with the maximum extinction ratio of ~12 dB. The output polarization direction could be fully controlled by the ACNT alignment direction in both lasers. To the best of our knowledge, this is the first time that ACNT device is applied to polarization control in laser systems. Our results exhibit that the ACNT device is a simple, low-cost, and broadband polarizer to control laser polarization dynamics, for various photonic applications (such as ...

  16. Broadband laser cooling of trapped atoms with ultrafast pulses

    E-Print Network [OSTI]

    B. B. Blinov; R. N. Kohn Jr.; M. J. Madsen; P. Maunz; D. L. Moehring; C. Monroe

    2005-07-07T23:59:59.000Z

    We demonstrate broadband laser cooling of atomic ions in an rf trap using ultrafast pulses from a modelocked laser. The temperature of a single ion is measured by observing the size of a time-averaged image of the ion in the known harmonic trap potential. While the lowest observed temperature was only about 1 K, this method efficiently cools very hot atoms and can sufficiently localize trapped atoms to produce near diffraction-limited atomic images.

  17. Nonlinear broadband photoluminescence of graphene induced by femtosecond laser irradiation

    SciTech Connect (OSTI)

    Liu, Wei-Tao; Wu, S.W.; Schuck, P.J.; Salmeron, Miquel; Shen, Y.R.; Wang, F.

    2010-07-01T23:59:59.000Z

    Upon femtosecond laser irradiation, a bright, broadband photoluminescence is observed from graphene at frequencies well above the excitation frequency. Analyses show that it arises from radiative recombination of a broad distribution of nonequilibrium electrons and holes, generated by rapid scattering between photoexcited carriers within tens of femtoseconds after the optical excitation. Its highly unusual characteristics come from the unique electronic and structural properties of graphene.

  18. Surface states controlled broadband enhancement of two-photon absorption

    SciTech Connect (OSTI)

    Zhou, Zhiqiang; Lu, Changgui; Xu, Shuhong; Jiang, Yuan; Yun, Binfeng; Wang, Chunlei; Cui, Yiping, E-mail: cyp@seu.edu.cn [Advanced Photonics Center, School of Electronic Science and Engineering, Southeast University, Nanjing 210096 (China)] [Advanced Photonics Center, School of Electronic Science and Engineering, Southeast University, Nanjing 210096 (China)

    2013-12-02T23:59:59.000Z

    We demonstrate the controllable broadband enhancement of two-photon absorption in a wide spectral range from 710?nm to 960?nm by controlling the surface states of aqueous Co{sup 2+} doped CdTe quantum dots, which is consistent with the measurement results of surface potential and fluorescence decay. The enhancement can be tuned in the range between 1 and 1.7 by changing the dopant concentrations that determine the surface states.

  19. Re: NBP RFI-Implementing the National Broadband Plan by Studying...

    Energy Savers [EERE]

    Studying the Communications Requirements of Electric Utilities to Inform Federal Smart Grid Policy Re: NBP RFI-Implementing the National Broadband Plan by Studying the...

  20. Broadband extreme ultraviolet probing of transient gratings in vanadium dioxide

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

    Sistrunk, Emily; Grilj, Jakob; Jeong, Jaewoo; Samant, Mahesh G.; Gray, Alexander X.; Dürr, Hermann A.; Parkin, Stuart S. P.; Gühr, Markus

    2015-01-01T23:59:59.000Z

    Nonlinear spectroscopy in the extreme ultraviolet (EUV) and soft x-ray spectral range offers the opportunity for element selective probing of ultrafast dynamics using core-valence transitions (Mukamel et al., Acc. Chem. Res. 42, 553 (2009)). We demonstrate a step on this path showing core-valence sensitivity in transient grating spectroscopy with EUV probing. We study the optically induced insulator-to-metal transition (IMT) of a VO? film with EUV diffraction from the optically excited sample. The VO? exhibits a change in the 3p-3d resonance of V accompanied by an acoustic response. Due to the broadband probing we are able to separate the two features.

  1. Design and demonstration of broadband thin planar diffractive acoustic lenses

    SciTech Connect (OSTI)

    Wang, Wenqi; Xie, Yangbo; Konneker, Adam; Popa, Bogdan-Ioan; Cummer, Steven A., E-mail: cummer@ee.duke.edu [Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina 27708 (United States)

    2014-09-08T23:59:59.000Z

    We present here two diffractive acoustic lenses with subwavelength thickness, planar profile, and broad operation bandwidth. Tapered labyrinthine unit cells with their inherently broadband effective material properties are exploited in our design. Both the measured and the simulated results are showcased to demonstrate the lensing effect over more than 40% of the central frequency. The focusing of a propagating Gaussian modulated sinusoidal pulse is also demonstrated. This work paves the way for designing diffractive acoustic lenses and more generalized phase engineering diffractive elements with labyrinthine acoustic metamaterials.

  2. ARM - Evaluation Product - Broadband Heating Rate Profile Project (BBHRP)

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006Datastreamstwrcam40m Documentation DataDatastreamsxsaprhsrhi1-min (NAVBE1M) Value AddedProductsBroadband

  3. Sensitive characterization of phase and amplitude semiconductor nonlinearities for broadband 20 fs excitation

    E-Print Network [OSTI]

    Keller, Ursula

    for broadband excitation. We find that the pump-induced phase changes at the exciton and in the continuum decay chopping and lock-in detection. In our setup, phase dynamics can be studied in a temporal window limited, we have studied phase and amplitude semiconductor nonlinearities for broadband excitation of ex

  4. Adaptive Resource Allocation in SDMA-based Wireless Broadband Networks with OFDM Signaling

    E-Print Network [OSTI]

    Koutsopoulos, Iordanis

    of wireless broadband access in local and wide area networks is the main expression of the need for flexible to adjust pa- rameters such as transmission power, modulation level, symbol rate or forward error correctionAdaptive Resource Allocation in SDMA-based Wireless Broadband Networks with OFDM Signaling Iordanis

  5. Calibration of broadband active acoustic systems using a single standard spherical target

    E-Print Network [OSTI]

    Stanton, Tim

    Calibration of broadband active acoustic systems using a single standard spherical target Timothy K 8 April 2008 When calibrating a broadband active acoustic system with a single standard target the concept of using this echo for calibration in the work of Dragonette et al. J. Acoust. Soc. Am. 69, 1186

  6. A Broadband Low-Noise-Amplifier Luca Daniel and Manolis Terrovitis

    E-Print Network [OSTI]

    Daniel, Luca

    describes the design of a two-stage broadband low-noise-amplifier (LNA) for the frequency range from 3 GHzA Broadband Low-Noise-Amplifier Luca Daniel and Manolis Terrovitis May 1999 Department dominates the system sensitivity. The primary objective of this work is to achieve low noise figure and flat

  7. Efficient broadband energy transfer via momentum matching at hybrid junctions of guided-waves

    E-Print Network [OSTI]

    Efficient broadband energy transfer via momentum matching at hybrid junctions of guided://apl.aip.org/about/rights_and_permissions #12;Efficient broadband energy transfer via momentum matching at hybrid junctions of guided, The American University in Cairo, New Cairo 11835, Egypt (Received 2 August 2012; accepted 5 September 2012

  8. Broadband Heating Rate Profile Project (BBHRP) - SGP ripbe1mcfarlane

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

    Riihimaki, Laura; Shippert, Timothy

    The objective of the ARM Broadband Heating Rate Profile (BBHRP) Project is to provide a structure for the comprehensive assessment of our ability to model atmospheric radiative transfer for all conditions. Required inputs to BBHRP include surface albedo and profiles of atmospheric state (temperature, humidity), gas concentrations, aerosol properties, and cloud properties. In the past year, the Radiatively Important Parameters Best Estimate (RIPBE) VAP was developed to combine all of the input properties needed for BBHRP into a single gridded input file. Additionally, an interface between the RIPBE input file and the RRTM was developed using the new ARM integrated software development environment (ISDE) and effort was put into developing quality control (qc) flags and provenance information on the BBHRP output files so that analysis of the output would be more straightforward. This new version of BBHRP, sgp1bbhrpripbeC1.c1, uses the RIPBE files as input to RRTM, and calculates broadband SW and LW fluxes and heating rates at 1-min resolution using the independent column approximation. The vertical resolution is 45 m in the lower and middle troposphere to match the input cloud properties, but is at coarser resolution in the upper atmosphere. Unlike previous versions, the vertical grid is the same for both clear-sky and cloudy-sky calculations.

  9. Broadband Heating Rate Profile Project (BBHRP) - SGP ripbe370mcfarlane

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

    Riihimaki, Laura; Shippert, Timothy

    The objective of the ARM Broadband Heating Rate Profile (BBHRP) Project is to provide a structure for the comprehensive assessment of our ability to model atmospheric radiative transfer for all conditions. Required inputs to BBHRP include surface albedo and profiles of atmospheric state (temperature, humidity), gas concentrations, aerosol properties, and cloud properties. In the past year, the Radiatively Important Parameters Best Estimate (RIPBE) VAP was developed to combine all of the input properties needed for BBHRP into a single gridded input file. Additionally, an interface between the RIPBE input file and the RRTM was developed using the new ARM integrated software development environment (ISDE) and effort was put into developing quality control (qc) flags and provenance information on the BBHRP output files so that analysis of the output would be more straightforward. This new version of BBHRP, sgp1bbhrpripbeC1.c1, uses the RIPBE files as input to RRTM, and calculates broadband SW and LW fluxes and heating rates at 1-min resolution using the independent column approximation. The vertical resolution is 45 m in the lower and middle troposphere to match the input cloud properties, but is at coarser resolution in the upper atmosphere. Unlike previous versions, the vertical grid is the same for both clear-sky and cloudy-sky calculations.

  10. Broadband Heating Rate Profile Project (BBHRP) - SGP ripbe1mcfarlane

    SciTech Connect (OSTI)

    Riihimaki, Laura; Shippert, Timothy

    2014-11-05T23:59:59.000Z

    The objective of the ARM Broadband Heating Rate Profile (BBHRP) Project is to provide a structure for the comprehensive assessment of our ability to model atmospheric radiative transfer for all conditions. Required inputs to BBHRP include surface albedo and profiles of atmospheric state (temperature, humidity), gas concentrations, aerosol properties, and cloud properties. In the past year, the Radiatively Important Parameters Best Estimate (RIPBE) VAP was developed to combine all of the input properties needed for BBHRP into a single gridded input file. Additionally, an interface between the RIPBE input file and the RRTM was developed using the new ARM integrated software development environment (ISDE) and effort was put into developing quality control (qc) flags and provenance information on the BBHRP output files so that analysis of the output would be more straightforward. This new version of BBHRP, sgp1bbhrpripbeC1.c1, uses the RIPBE files as input to RRTM, and calculates broadband SW and LW fluxes and heating rates at 1-min resolution using the independent column approximation. The vertical resolution is 45 m in the lower and middle troposphere to match the input cloud properties, but is at coarser resolution in the upper atmosphere. Unlike previous versions, the vertical grid is the same for both clear-sky and cloudy-sky calculations.

  11. Broadband Heating Rate Profile Project (BBHRP) - SGP ripbe370mcfarlane

    SciTech Connect (OSTI)

    Riihimaki, Laura; Shippert, Timothy

    2014-11-05T23:59:59.000Z

    The objective of the ARM Broadband Heating Rate Profile (BBHRP) Project is to provide a structure for the comprehensive assessment of our ability to model atmospheric radiative transfer for all conditions. Required inputs to BBHRP include surface albedo and profiles of atmospheric state (temperature, humidity), gas concentrations, aerosol properties, and cloud properties. In the past year, the Radiatively Important Parameters Best Estimate (RIPBE) VAP was developed to combine all of the input properties needed for BBHRP into a single gridded input file. Additionally, an interface between the RIPBE input file and the RRTM was developed using the new ARM integrated software development environment (ISDE) and effort was put into developing quality control (qc) flags and provenance information on the BBHRP output files so that analysis of the output would be more straightforward. This new version of BBHRP, sgp1bbhrpripbeC1.c1, uses the RIPBE files as input to RRTM, and calculates broadband SW and LW fluxes and heating rates at 1-min resolution using the independent column approximation. The vertical resolution is 45 m in the lower and middle troposphere to match the input cloud properties, but is at coarser resolution in the upper atmosphere. Unlike previous versions, the vertical grid is the same for both clear-sky and cloudy-sky calculations.

  12. ARM - Measurement - Longwave narrowband radiance

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadap Documentation TDMADAP : XDC

  13. ARM - Measurement - Longwave spectral radiance

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadap Documentation TDMADAP : XDCnarrowband upwelling irradiance ARM Data Discovery Browsespectral

  14. Simulation of free-electron lasers seeded with broadband radiation

    SciTech Connect (OSTI)

    Bajlekov, Svetoslav; Fawley, William; Schroeder, Carl; Bartolini, Riccardo; Hooker, Simon

    2011-03-10T23:59:59.000Z

    The longitudinal coherence of free-electron laser (FEL) radiation can be enhanced by seeding the FEL with high harmonics of an optical laser pulse. The radiation produced by high-harmonic generation (HHG), however, has a fast-varying temporal profile that can violate the slowly varying envelope approximation and limited frequency window that is employed in conventional free-electron laser simulation codes. Here we investigate the implications of violating this approximation on the accuracy of simulations. On the basis of both analytical considerations and 1D numerical studies, it is concluded that, for most realistic scenarios, conventional FEL codes are capable of accurately simulating the FEL process even when the seed radiation violates the slowly varying envelope approximation. We additionally discuss the significance of filtering the harmonic content of broadband HHG seeds.

  15. Broadband Quantum Efficiency Enhancement in High Index Nanowires Resonators

    E-Print Network [OSTI]

    Yang, Yiming; Hyatt, Steven; Yu, Dong

    2015-01-01T23:59:59.000Z

    Light trapping in sub-wavelength semiconductor nanowires (NWs) offers a promising approach to simultaneously reducing material consumption and enhancing photovoltaic performance. Nevertheless, the absorption efficiency of a NW, defined by the ratio of optical absorption cross section to the NW diameter, lingers around 1 in existing NW photonic devices, and the absorption enhancement suffers from a narrow spectral width. Here, we show that the absorption efficiency can be significantly improved in NWs with higher refractive indices, by an experimental observation of up to 350% external quantum efficiency (EQE) in lead sulfide (PbS) NW resonators, a 3-fold increase compared to Si NWs. Furthermore, broadband absorption enhancement is achieved in single tapered NWs, where light of various wavelengths is absorbed at segments with different diameters analogous to a tandem solar cell. Overall, the single NW Schottky junction solar cells benefit from optical resonance, near bandgap open circuit voltage, and long mino...

  16. Broadband reflectionless metasheets: Frequency-selective transmission and perfect absorption

    E-Print Network [OSTI]

    Asadchy, V S; Ra'di, Y; Khakhomov, S A; Semchenko, I V; Tretyakov, S A

    2015-01-01T23:59:59.000Z

    Energy of propagating electromagnetic waves can be fully absorbed in a thin lossy layer, but only in a narrow frequency band, as follows from the causality principle. On the other hand, it appears that there are no fundamental limitations on broadband matching of thin absorbing layers. However, known thin absorbers produce significant reflections outside of the resonant absorption band. In this paper we explore possibilities to realize a thin absorbing layer which produces no reflected waves in a very wide frequency range, while the transmission coefficient has a narrow peak of full absorption. Here we show, both theoretically and experimentally, that a wide-band-matched thin resonant absorber, invisible in reflection, can be realized if one and the same resonant mode of the absorbing array unit cells is utilized to create both electric and magnetic responses. We test this concept using chiral particles in each unit cells, arranged in a periodic planar racemic array, utilizing chirality coupling in each unit ...

  17. BROADBAND SPECTRAL INVESTIGATIONS OF SGR J1550-5418 BURSTS

    SciTech Connect (OSTI)

    Lin Lin; Goegues, Ersin; Kaneko, Yuki [Faculty of Engineering and Natural Sciences, Sabanc Latin-Small-Letter-Dotless-I University, Orhanl Latin-Small-Letter-Dotless-I Tuzla, Istanbul 34956 (Turkey); Baring, Matthew G. [Department of Physics and Astronomy, Rice University, MS-108, P.O. Box 1892, Houston, TX 77251 (United States); Granot, Jonathan [Racah Institute of Physics, Hebrew University, Jerusalem 91904 (Israel); Kouveliotou, Chryssa [Space Science Office, VP62, NASA/Marshall Space Flight Center, Huntsville, AL 35812 (United States); Van der Horst, Alexander; Watts, Anna L. [Astronomical Institute 'Anton Pannekoek', University of Amsterdam, Postbus 94249, 1090 GE Amsterdam (Netherlands); Gruber, David; Von Kienlin, Andreas [Max-Planck-Institut fuer extraterrestrische Physik, Postfach 1312, D-85748 Garching bei Mnchen (Germany); Younes, George [USRA, National Space Science and Technology Center, 320 Sparkman Drive, Huntsville, AL 35805 (United States); Gehrels, Neil, E-mail: linlin@sabanciuniv.edu [NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)

    2012-09-01T23:59:59.000Z

    We present the results of our broadband spectral analysis of 42 SGR J1550-5418 bursts simultaneously detected with the Swift/X-ray Telescope (XRT) and the Fermi/Gamma-ray Burst Monitor (GBM), during the 2009 January active episode of the source. The unique spectral and temporal capabilities of the XRT windowed timing mode have allowed us to extend the GBM spectral coverage for these events down to the X-ray domain (0.5-10 keV). Our earlier analysis of the GBM data found that the SGR J1550-5418 burst spectra were described equally well with either a Comptonized model or with two blackbody functions; the two models were statistically indistinguishable. Our new broadband (0.5-200 keV) spectral fits show that, on average, the burst spectra are better described with two blackbody functions than with the Comptonized model. Thus, our joint XRT-GBM analysis clearly shows for the first time that the SGR J1550-5418 burst spectra might naturally be expected to exhibit a more truly thermalized character, such as a two-blackbody or even a multi-blackbody signal. Using the Swift and RXTE timing ephemeris for SGR J1550-5418 we construct the distribution of the XRT burst counts with spin phase and find that it is not correlated with the persistent X-ray emission pulse phase from SGR J1550-5418. These results indicate that the burst emitting sites on the neutron star need not to be co-located with hot spots emitting the bulk of the persistent X-ray emission. Finally, we show that there is a significant pulse phase dependence of the XRT burst counts, likely demonstrating that the surface magnetic field of SGR J1550-5418 is not uniform over the emission zones, since it is anticipated that regions with stronger surface magnetic field could trigger bursts more efficiently.

  18. Radiative Effects of Dust Aerosols, Natural Cirrus Clouds and Contrails: Broadband Optical Properties and Sensitivity Studies

    E-Print Network [OSTI]

    Yi, Bingqi

    2013-07-09T23:59:59.000Z

    This dissertation aims to study the broadband optical properties and radiative effects of dust aerosols and ice clouds. It covers three main topics: the uncertainty of dust optical properties and radiative effects from the dust particle shape...

  19. Engineering broadband and anisotropic photoluminescence emission from rare earth doped tellurite thin film photonic crystals

    E-Print Network [OSTI]

    Vanhoutte, Michiel

    Broadband and anisotropic light emission from rare-earth doped tellurite thin films is demonstrated using Er[superscript 3+]-TeO[subscript 2] photonic crystals (PhCs). By adjusting the PhC parameters, photoluminescent light ...

  20. Meta-atom cluster acoustic metamaterial with broadband negative effective mass density

    SciTech Connect (OSTI)

    Chen, Huaijun; Zhai, Shilong; Ding, Changlin; Liu, Song; Luo, Chunrong; Zhao, Xiaopeng, E-mail: xpzhao@nwpu.edu.cn [Smart Materials Laboratory, Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710129 (China)

    2014-02-07T23:59:59.000Z

    We design a resonant meta-atom cluster, via which a two-dimensional (2D) acoustic metamaterial (AM) with broadband negative effective mass density from 1560 Hz to 5580 Hz is fabricated. Experimental results confirm that there is only weak interaction among the meta-atoms in the cluster. And then the meta-atoms in the cluster independently resonate, resulting in the cluster becoming equivalent to a broadband resonance unit. Extracted effective refractive indices from reflection and transmission measurements of the 2D AM appear to be negative from 1500 Hz to 5480 Hz. The broadband negative refraction has also been demonstrated by our further experiments. We expect that this meta-atom cluster AM will significantly contribute to the design of broadband negative effective mass density AM.

  1. A compact broadband multilayer patch antenna and its applications for phased arrays

    E-Print Network [OSTI]

    Kidder, Charles Crandall

    2002-01-01T23:59:59.000Z

    complexity of the antenna. This thesis details the work done on developing a broadband patch antenna that is compact and easily manufactured. Three antenna designs are detailed herein. Simulation and measured results indicate that the double II-shaped u...

  2. A Broadband Miniaturized Microwave Dielectric Spectroscopy System Based on Impedance Sensing

    E-Print Network [OSTI]

    Kabiri, Saman 1988-

    2013-01-07T23:59:59.000Z

    The main purpose of this thesis is to propose a broadband miniaturized spectroscopy system to detect dielectric constant and loss tangent of lossy organic materials at RF/Microwave frequencies. Complex permittivities of lossy liquids are measured...

  3. Optimization of Two-photon Excited Fluorescence Enhancement between Tunable and Broadband Femtosecond Laser Pulse Excitations

    E-Print Network [OSTI]

    Wang, Chao

    2012-02-14T23:59:59.000Z

    This project explores optimization of two-photon excited fluorescence (TPEF) enhancement between tunable narrowband and un-tuned broadband femtosecond (fs) laser pulse excitations for two-photon microscopy (TPM). The research is conducted...

  4. Radiative Effects of Dust Aerosols, Natural Cirrus Clouds and Contrails: Broadband Optical Properties and Sensitivity Studies 

    E-Print Network [OSTI]

    Yi, Bingqi

    2013-07-09T23:59:59.000Z

    This dissertation aims to study the broadband optical properties and radiative effects of dust aerosols and ice clouds. It covers three main topics: the uncertainty of dust optical properties and radiative effects from the dust particle shape...

  5. Microsoft Word - Broadband Over Power Lines_FINAL.06.01.10.doc

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

    Broadband Over Power Lines Could Accelerate the Transmission Smart Grid 1 Prepared by: Booz Allen Hamilton (BAH) Bruce Renz Renz Consulting, LLC DOE Contract number: DE-FE000400...

  6. Theory and design of integrated optical isolators and broadband couplers using Fresnel zone plates

    E-Print Network [OSTI]

    Cordova, Brad Gilbert

    2013-01-01T23:59:59.000Z

    This thesis is divided into two main sections: the first containing the analysis of the broadband vertical coupler, and the second involving the theory and design of the integrated optical isolators. In the first part we ...

  7. Broadband tunability of gain-flattened quantum well semiconductor lasers with an external grating

    SciTech Connect (OSTI)

    Mittelstein, M.; Mehuys, D.; Yariv, A.; Ungar, J.E.; Sarfaty, R.

    1989-03-20T23:59:59.000Z

    Quantum well lasers are shown to exhibit flattened broadband gain spectra at a particular pumping condition. The gain requirement for a grating-tuned external cavity configuration is examined and applied to a semiconductor quantum well laser with an optimized length of gain region. The predicted very broadband tunability of quantum well lasers is confirmed experimentally by grating-tuning of uncoated lasers over 85 nm, with single longitudinal mode output power exceeding 200 mW.

  8. An in situ geophone-calibration method for broadband amplitude and phase determination

    E-Print Network [OSTI]

    Peoples, Christopher James

    1993-01-01T23:59:59.000Z

    AN IN SITU GEOPHONE-CALIBRATION METHOD FOR BROADBAND AMPLITUDE AND PHASE DETERMINATION A Thesis by CHRISTOPHER JAMES PEOPLES Approved as to style and content by: Steven, Harder (Chair of Committee) Antho F. angi (Member) Robert Beck Clark... (Member) Joe S. Watkins (Head of Department) May 1993 ABSTRACT An In Situ Geophone-Calibration Method for Broadband Amplitude and Phase Determination. (May 1993) Christopher James Peoples, B. S. , University of California, Riverside Chair...

  9. Broadband enhancement of light harvesting in luminescent solar concentrator

    E-Print Network [OSTI]

    Xiao, Yun-Feng; Xiao, Lixin; Sun, Fang-Wen; Gong, Qihuang

    2010-01-01T23:59:59.000Z

    Luminescent solar concentrator (LSC) can absorb large-area incident sunlight, then emit luminescence with high quantum efficiency, which finally be collected by a small photovoltaic (PV) system. The light-harvesting area of the PV system is much smaller than that of the LSC system, potentially improving the efficiency and reducing the cost of solar cells. Here, based on Fermi-golden rule, we present a theoretical description of the luminescent process in nanoscale LSCs where the conventional ray-optics model is no longer applicable. As an example calculated with this new model, we demonstrate that a slot waveguide consisting of a nanometer-sized low-index slot region sandwiched by two high-index regions provides a broadband enhancement of light harvesting by the luminescent centers in the slot region. This is because the slot waveguide can (1) greatly enhance the spontaneous emission due to the Purcell effect, (2) dramatically increase the effective absorption cross-section of luminescent centers, and (3) str...

  10. Broadband turbulent spectra in gamma-ray burst light curves

    SciTech Connect (OSTI)

    Van Putten, Maurice H. P. M. [Astronomy and Space Science, Sejong University, 98 Gunja-Dong Gwangin-gu, Seoul 143-747 (Korea, Republic of); Guidorzi, Cristiano; Frontera, Filippo, E-mail: mvp@sejong.ac.kr [Department of Physics and Earth Sciences, University of Ferrara, Via Saragat 1, I-44122 Ferrara (Italy)

    2014-05-10T23:59:59.000Z

    Broadband power density spectra offer a window to understanding turbulent behavior in the emission mechanism and, at the highest frequencies, in the putative inner engines powering long gamma-ray bursts (GRBs). We describe a chirp search method alongside Fourier analysis for signal detection in the Poisson noise-dominated, 2 kHz sampled, BeppoSAX light curves. An efficient numerical implementation is described in O(Nnlog n) operations, where N is the number of chirp templates and n is the length of the light-curve time series, suited for embarrassingly parallel processing. For the detection of individual chirps over a 1 s duration, the method is one order of magnitude more sensitive in signal-to-noise ratio than Fourier analysis. The Fourier-chirp spectra of GRB 010408 and GRB 970816 show a continuation of the spectral slope with up to 1 kHz of turbulence identified in low-frequency Fourier analysis. The same continuation is observed in an average spectrum of 42 bright, long GRBs. An outlook on a similar analysis of upcoming gravitational wave data is included.

  11. Broadband Lg Attenuation Modeling in the Middle East

    SciTech Connect (OSTI)

    Pasyanos, M E; Matzel, E M; Walter, W R; Rodgers, A J

    2008-08-21T23:59:59.000Z

    We present a broadband tomographic model of Lg attenuation in the Middle East derived from source- and site-corrected amplitudes. Absolute amplitude measurements are made on hand-selected and carefully windowed seismograms for tens of stations and thousands of crustal earthquakes resulting in excellent coverage of the region. A conjugate gradient method is used to tomographically invert the amplitude dataset of over 8000 paths over a 45{sup o} x 40{sup o} region of the Middle East. We solve for Q variation, as well as site and source terms, for a wide range of frequencies ranging from 0.5-10 Hz. We have modified the standard attenuation tomography technique to more explicitly define the earthquake source expression in terms of the seismic moment. This facilitates the use of the model to predict the expected amplitudes of new events, an important consideration for earthquake hazard or explosion monitoring applications. The attenuation results have a strong correlation to tectonics. Shields have low attenuation, while tectonic regions have high attenuation, with the highest attenuation at 1 Hz is found in eastern Turkey. The results also compare favorably to other studies in the region made using Lg propagation efficiency, Lg/Pg amplitude ratios and two-station methods. We tomographically invert the amplitude measurements for each frequency independently. In doing so, it appears the frequency-dependence of attenuation is not compatible with the power law representation of Q(f), an assumption that is often made.

  12. Tailored quantum statistics from broadband states of light

    E-Print Network [OSTI]

    S. Hartmann; F. Friedrich; A. Molitor; M. Reichert; W. Elsäßer; R. Walser

    2014-12-19T23:59:59.000Z

    We analyze the statistics of photons originating from amplified spontaneous emission generated by a quantum dot superluminescent diode. Experimentally detectable emission properties are taken into account by parametrizing the corresponding quantum state as a multi-mode phase-randomized Gaussian density operator. The validity of this model is proven in two subsequent experiments using fast two-photon-absorption detection observing second order equal-time- as well as second order fully time-resolved intensity correlations on femtosecond timescales. In the first experiment, we study the photon statistics when the number of contributing longitudinal modes is systematically reduced by applying well-controlled optical feedback. In a second experiment, we add coherent light from a single-mode laserdiode to quantum dot superluminescent diode broadband radiation. Tuning the power ratio, we realize tailored second order correlations ranging from Gaussian to Poissonian statistics. Both experiments are very well matched by theory, thus giving first insights into quantum properties of radiation from quantum dot superluminescent diodes.

  13. Broadband Model Performance for an Updated National Solar Radiation Database in the United States of America: Preprint

    SciTech Connect (OSTI)

    Myers, D. R.; Wilcox, S.; Marion, W.; George, R.; Anderberg, M.

    2005-09-01T23:59:59.000Z

    Updated review of broadband model performance in a project being done to update the existing United States National Solar Radiation Database (NSRDB).

  14. Broadband 180 degree universal rotation pulses for NMR spectroscopy designed by optimal control

    E-Print Network [OSTI]

    Skinner, Thomas E; Nimbalkar, Manoj; Bermel, Wolfgang; Luy, Burkhard; Glaser, Steffen J

    2011-01-01T23:59:59.000Z

    Broadband inversion pulses that rotate all magnetization components 180 degrees about a given fixed axis are necessary for refocusing and mixing in high-resolution NMR spectroscopy. The relative merits of various methodologies for generating pulses suitable for broadband refocusing are considered. The de novo design of 180 degree universal rotation pulses using optimal control can provide improved performance compared to schemes which construct refocusing pulses as composites of existing pulses. The advantages of broadband universal rotation by optimized pulses (BURBOP) are most evident for pulse design that includes tolerance to RF inhomogeneity or miscalibration. We present new modifications of the optimal control algorithm that incorporate symmetry principles and relax conservative limits on peak RF pulse amplitude for short time periods that pose no threat to the probe. We apply them to generate a set of pulses suitable for widespread use in Carbon-13 spectroscopy on the majority of available probes.

  15. Method and means of transmitting and receiving broad-band unipolar, ultrasonic pulses for ultrasonic inspection

    DOE Patents [OSTI]

    Thompson, D.O.; Hsu, D.K.

    1993-12-14T23:59:59.000Z

    The invention includes a means and method for transmitting and receiving broadband, unipolar, ultrasonic pulses for ultrasonic inspection. The method comprises generating a generally unipolar ultrasonic stress pulse from a low impedance voltage pulse transmitter along a low impedance electrical pathway to an ultrasonic transducer, and receiving the reflected echo of the pulse by the transducer, converting it to a voltage signal, and passing it through a high impedance electrical pathway to an output. The means utilizes electrical components according to the method. The means and method allow a single transducer to be used in a pulse/echo mode, and facilitates alternatingly transmitting and receiving the broadband, unipolar, ultrasonic pulses. 25 figures.

  16. Broadband squeezing of quantum noise in a Michelson interferometer with Twin-Signal-Recycling

    E-Print Network [OSTI]

    André Thüring; Christian Gräf; Henning Vahlbruch; Moritz Mehmet; Karsten Danzmann; Roman Schnabel

    2010-05-25T23:59:59.000Z

    Twin-Signal-Recycling (TSR) builds on the resonance doublet of two optically coupled cavities and efficiently enhances the sensitivity of an interferometer at a dedicated signal frequency. We report on the first experimental realization of a Twin-Signal-Recycling Michelson interferometer and also its broadband enhancement by squeezed light injection. The complete setup was stably locked and a broadband quantum noise reduction of the interferometers shot noise by a factor of up to 4\\,dB was demonstrated. The system was characterized by measuring its quantum noise spectra for several tunings of the TSR cavities. We found good agreement between the experimental results and numerical simulations.

  17. Method and means of transmitting and receiving broad-band unipolar, ultrasonic pulses for ultrasonic inspection

    DOE Patents [OSTI]

    Thompson, Donald O. (Ames, IA); Hsu, David K. (Ames, IA)

    1993-12-14T23:59:59.000Z

    The invention includes a means and method for transmitting and receiving broadband, unipolar, ultrasonic pulses for ultrasonic inspection. The method comprises generating a generally unipolar ultrasonic stress pulse from a low impedance voltage pulse transmitter along a low impedance electrical pathway to an ultrasonic transducer, and receiving the reflected echo of the pulse by the transducer, converting it to a voltage signal, and passing it through a high impedance electrical pathway to an output. The means utilizes electrical components according to the method. The means and method allow a single transducer to be used in a pulse/echo mode, and facilitates alternatingly transmitting and receiving the broadband, unipolar, ultrasonic pulses.

  18. Photon number squeezing of ultra-broadband laser pulses generated by microstructure fibers

    E-Print Network [OSTI]

    K. Hirosawa; H. Furumochi; A. Tada; F. Kannari; M. Takeoka; M. Sasaki

    2005-01-10T23:59:59.000Z

    To the best of our knowledge, we demonstrate for the first time the generation of photon number squeezing by spectral filtering for ultra-broadband light generated by microstructure fibers at 800 nm. A maximum squeezing of 4.6 dB is observed, corresponding to 10.3 dB after correcting for detection losses. We numerically analyzed the quantum dynamics of ultrashort laser pulse propagation through optical fibers by solving a nonlinear quantum Schrodinger equation that included Raman scattering, especially for the quantum correlation of photon number fluctuation among frequency modes in broadband pulses.

  19. Broadband emission in InAs/InGaAlAs quantum-dash-in-well laser Boon S. Ooi1, a

    E-Print Network [OSTI]

    -broadband sources are generated using nonlinear-optical transformations of ultra-short laser pulses and photonicBroadband emission in InAs/InGaAlAs quantum-dash-in-well laser Boon S. Ooi1, a , Hery S. Djie1: Quantum dash, Quantum dot, Broadband emission, Semiconductor Laser. Abstract. We report on the development

  20. Characterization of a liquid-crystal ultrafast pulse shaper for ultra-broadband applications

    E-Print Network [OSTI]

    Characterization of a liquid-crystal ultrafast pulse shaper for ultra-broadband applications pulse shaping Spatial light modulators Ultrafast optics Femtosecond pulses a b s t r a c t By combining in revised form 22 January 2014 Accepted 28 January 2014 Available online 6 February 2014 Keywords: Ultrafast

  1. Broadband conversion in an Yb:KYW-pumped ultrafast optical parametric oscillator with a long

    E-Print Network [OSTI]

    Broadband conversion in an Yb:KYW-pumped ultrafast optical parametric oscillator with a long-infrared pulses at 3.5-µm from an optical parametric oscillator incorporating a 25- mm MgO:PPLN crystal and synchronously-pumped by chirped pulses from a fiber-amplified Yb:KYW laser. A long nonlinear crystal permits

  2. VIIRS narrowband to broadband land surface albedo conversion: formula and validation

    E-Print Network [OSTI]

    Liang, Shunlin

    albedo, such as the Advanced Very High Resolution Radiometer (AVHRR), Moderate Resolution Imaging broadband albedo (0.4­4.0 mm) of land surfaces from Visible/Infrared Imager/Radiometer Suite (VIIRS algorithm. 1. Introduction Albedo is a critical variable for accurate climate and surface energy balance

  3. LETTER doi:10.1038/nature10067 A graphene-based broadband optical modulator

    E-Print Network [OSTI]

    Wang, Feng

    LETTER doi:10.1038/nature10067 A graphene-based broadband optical modulator Ming Liu1 *, Xiaobo Yin- integrated electroabsorption modulator based on monolayer graphene. By electrically tuning the Fermi level of the graphene sheet, we demonstrate modulation of the guided light at frequencies over 1 GHz, together

  4. Supporting Broadband Growth in an Interregional Level: The Case of Greece-Italy Partnership

    E-Print Network [OSTI]

    Bouras, Christos

    Supporting Broadband Growth in an Interregional Level: The Case of Greece-Italy Partnership of Patras, Greece *** Department of Informatics, Aristotle University of Thessaloniki, Greece Abstract in an Interregional Level between regions of Italy and Greece. Main target of the project is the technology

  5. Solar Energy, 2006, 80, 3, 361-367 SIMULATING METEOSAT-7 BROADBAND RADIANCES USING TWO

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Solar Energy, 2006, 80, 3, 361-367 SIMULATING METEOSAT-7 BROADBAND RADIANCES USING TWO VISIBLE-00361360,version1-13Feb2009 Author manuscript, published in "Solar Energy 80, 3 (2006) 361-367" DOI : 10.1016/j.solener.2005.01.012 #12;Solar Energy, 2006, 80, 3, 361-367 · Imet-7 the maximum irradiance

  6. LOCAL ACTORS BUILD BROADBAND INFRASTRUCTURE Ingjerd Skogseid, Western Norway Research Institute, Postboks 163, 6851 Sogndal, Norway,

    E-Print Network [OSTI]

    Hanseth, Ole

    LOCAL ACTORS BUILD BROADBAND INFRASTRUCTURE Ingjerd Skogseid, Western Norway Research Institute, Postboks 163, 6851 Sogndal, Norway, Ingjerd.Skogseid@vestforsk.no Ole Hanseth, Department of informatics, University of Oslo, Norway, Ole.Hanseth@ifi.uio.no Abstract This paper explores how local actors can play

  7. Adaptive Congestion Control in Broadband-ISDN: High Throughput with Sustained Quality of Service

    E-Print Network [OSTI]

    Pitsillides, Andreas

    ). The controller regulates QoS by manipulating the flow of controllable traffic into the network. Controllability. In this paper we use an adaptive feedback and feedforward control system to maximise throughput such that the QoAdaptive Congestion Control in Broadband-ISDN: High Throughput with Sustained Quality of Service

  8. Accelerating SSL using the Vector processors in IBM's Cell Broadband Engine

    E-Print Network [OSTI]

    Accelerating SSL using the Vector processors in IBM's Cell Broadband Engine for Sony's Playstation and performance gains when using the vector processing capabilities for SSL and shows that big improve- ments are still possible with the hardware designed primarily for other purposes. 1 Why SSL? Despite huge gains

  9. Ultrathin, high-efficiency, broad-band, omni-acceptance, organic solar cells enhanced by

    E-Print Network [OSTI]

    Ultrathin, high-efficiency, broad-band, omni- acceptance, organic solar cells enhanced by plasmonic: Three of central challenges in solar cells are high light coupling into solar cell, high light trapping and demonstration of a new ultra-thin high- efficiency organic solar cell (SC), termed "plasmonic cavity

  10. Low-voltage broad-band electroabsorption from thin Ge/SiGe

    E-Print Network [OSTI]

    Miller, David A. B.

    Low-voltage broad-band electroabsorption from thin Ge/SiGe quantum wells epitaxially grown than 5 dB over the entire telecommunication S- and C-bands with only 1V drive using a new Ge/SiGe QW epitaxy design approach; further, this is demonstrated with the thinnest Ge/SiGe epitaxy to date, using

  11. The Potential Economic Impact of the National Broadband Plan on the New Mexico Exchange Carriers Group

    E-Print Network [OSTI]

    Johnson, Eric E.

    The Potential Economic Impact of the National Broadband Plan on the New Mexico Exchange Carriers Center New Mexico State University Las Cruces, New Mexico #12;Arrowhead Center New Mexico Exchange List of Maps ii Executive Summary iii Introduction 1 New Mexico Exchange Carriers Group 1 New Mexico

  12. Broadband High Power Amplifier using Spatial Power Combining Pengcheng Jia 1

    E-Print Network [OSTI]

    and low noise are among the most important features in amplifier design. Broadband spatial power combining the heat sinking in high power application. A high power amplifier using the compact combiner design maintaining good linearity and improving phase noise of the MMIC amplifiers. Coaxial waveguide was used

  13. Broadband photoacoustic spectroscopy using a free-electron laser J. Gomez Rivasa)

    E-Print Network [OSTI]

    Sprik, Rudolf

    Broadband photoacoustic spectroscopy using a free-electron laser J. Go´mez Rivasa) and R. Sprikb generated by a free-electron laser, we demonstrate the capabilities of this sort of laser to perform demonstrate that the pulsed structure of a free-electron laser FEL might be used for sensitive PA spectroscopy

  14. Cloudy Sky Version of Bird's Broadband Hourly Clear Sky Model (Presentation)

    SciTech Connect (OSTI)

    Myers, D.

    2006-08-01T23:59:59.000Z

    Presentation on Bird's Broadband Hourly Clear Sky Model given by NREL's Daryl Myers at SOLAR 2006. The objective of this report is to produce ''all sky'' modeled hourly solar radiation. This is based on observed cloud cover data using a SIMPLE model.

  15. Telecommunications Policy 28 (2004) 559578 Can broadband over powerline carrier (PLC) compete?

    E-Print Network [OSTI]

    Telecommunications Policy 28 (2004) 559­578 Can broadband over powerline carrier (PLC) compete Abstract Powerline carrier (PLC) communications have been heralded by the FCC as the ``3rd wire'' to every on the United States). Results indicate that PLC does not appear to represent a major disruptive technology

  16. Defining the Fresnel zone for broadband radiation Jeremy Pearce and Daniel Mittleman*

    E-Print Network [OSTI]

    Mittleman, Daniel

    Defining the Fresnel zone for broadband radiation Jeremy Pearce and Daniel Mittleman* Department of the Fresnel zone is central to many areas of imaging. In tomographic imaging, the transverse spatial resolution can be limited by the size of the first Fresnel zone, usually defined only for monochromatic

  17. SUZAKU BROADBAND SPECTROSCOPY OF SWIFT J1753.5–0127 IN THE LOW-HARD STATE

    E-Print Network [OSTI]

    Reynolds, Mark T.

    We present Suzaku observations of the Galactic black hole candidate Swift J1753.5–0127 in the low-hard state (LHS). The broadband coverage of Suzaku enables us to detect the source over the energy range 0.6-250 keV. The ...

  18. Power Prediction on Broadband Channels Mikael Sternad, Torbjorn Ekman, Anders Ahl en

    E-Print Network [OSTI]

    Power Prediction on Broadband Channels Mikael Sternad, Torbjorn Ekman, Anders Ahl#19;en Signals resource allocation and planning require accurate predictions of the changing received power. To form a prediction of the fading power, the individual taps of the channel are here predicted and their squared

  19. Layered Frequency-Domain Turbo Equalization for Single Carrier Broadband MIMO Systems

    E-Print Network [OSTI]

    Zheng, Yahong Rosa

    Layered Frequency-Domain Turbo Equalization for Single Carrier Broadband MIMO Systems Jian Zhang 72701, USA Abstract-- A new layered frequency-domain turbo equalization (LFDTE) scheme is proposed the respective advantages of layered detection and turbo equalization to further lower the bit error rate (BER

  20. Computer Generation of Fast Fourier Transforms for the Cell Broadband Engine

    E-Print Network [OSTI]

    Franchetti, Franz

    , however, requires that the pro- grammer performs all memory and inter-core data movement oper- ationsComputer Generation of Fast Fourier Transforms for the Cell Broadband Engine Srinivas Chellappa, streaming, and vectorization. We address this prob- lem for the discrete Fourier transform (DFT

  1. 2010 Telecommunications Policy Research Conference The FCC Plan for a Public Safety Broadband Wireless Network

    E-Print Network [OSTI]

    Peha, Jon M.

    ;2010 Telecommunications Policy Research Conference 2 In March 2010, the U.S. Federal Communications Commission (FCC Communications Commission (FCC) released the National Broadband Plan (NBP) for the United States, which made Wireless Network Jennifer A. Manner, Stagg Newman, Jon M. Peha Abstract In March 2010, the U.S. Federal

  2. Graded index and randomly oriented core-shell silicon nanowires with broadband and wide angle antireflection for photovoltaic cell applications

    E-Print Network [OSTI]

    Pignalosa, P; Qiao, L; Tseng, M; Yi, Yasha

    2011-01-01T23:59:59.000Z

    Antireflection with broadband and wide angle properties is important for a wide range of applications on photovoltaic cells and display. The SiOx shell layer provides a natural antireflection from air to the Si core absorption layer. In this work, we have demonstrated the random core-shell silicon nanowires with both broadband (from 400nm to 900nm) and wide angle (from normal incidence to 60\\degree) antireflection characteristics within AM1.5 solar spectrum. The graded index structure from the randomly oriented core-shell (Air/SiOx/Si) nanowires may provide a potential avenue to realize a broadband and wide angle antireflection layer.

  3. Effects of broad-banded higher harmonics on fatigue damage of risers due to vortex-induced vibrations

    E-Print Network [OSTI]

    Price, Rachel Elizabeth

    2011-01-01T23:59:59.000Z

    Recent works have discussed "chaotic" or "Type-II" riser motion and suggested that it is a general feature of VIV riser response. Chaotic riser response contains broad-banded harmonics and a combination of standing and ...

  4. Broadband RF Front-End Design for Multi-Standard Receiver with High-Linearity and Low-Noise Techniques

    E-Print Network [OSTI]

    Kim, Ju Sung

    2012-02-14T23:59:59.000Z

    Future wireless communication devices must support multiple standards and features on a single-chip. The trend towards software-defined radio requires flexible and efficient RF building blocks which justifies the adoption of broadband receiver front...

  5. Broadband Collaboration Equipment Mobile Networks Security Storage White Papers Webcasts Tests News Blogs Newsletters Videos Events Resources More

    E-Print Network [OSTI]

    Chiao, Jung-Chih

    Broadband Collaboration Equipment Mobile Networks Security Storage White Papers Webcasts Tests News is absolutely gorgeous View more Latest News Home Networking White Papers Improving Business Value of WAN, improve... Accelerating Cloud Performance with WAN Optimization Today's smart CIOs are assessing

  6. Extending broadband past the urban fringe with wireless mesh : a strategic analysis with policy implications for Kenya's Universal Service Fund

    E-Print Network [OSTI]

    Berkoben, Keith A. (Keith Alexander)

    2011-01-01T23:59:59.000Z

    As the competitive wholesale cost of bandwidth continues to plummet in Kenya, last-mile networks have become a bottleneck in the extension of affordable broadband outside major cities. In this work we explore the business ...

  7. Design of Optical Metamaterial Mirror with Metallic Nanoparticles for Broadband Light Absorption in Graphene Optoelectronic Devices

    E-Print Network [OSTI]

    Lee, Seungwoo

    2015-01-01T23:59:59.000Z

    A general metallic mirror (i.e., a flat metallic surface) has been a popular optical component that can contribute broadband light absorption to thin-film optoelectronic devices; nonetheless, such electric mirror with a reversal of reflection phase inevitably causes the problem of minimized electric field near at the mirror surface (maximized electric field at one quarter of wavelength from mirror). This problem becomes more elucidated, when the deep-subwavelength-scaled two-dimensional (2D) material (e.g., graphene and molybdenum disulfide) is implemented into optoelectronic device as an active channel layer. The purpose of this work was to conceive the idea for using a charge storage layer (spherical Au nanoparticles (AuNPs), embedded into dielectric matrix) of the floating-gate graphene photodetector as a magnetic mirror, which allows the device to harness the increase in broadband light absorption. In particular, we systematically examined whether the versatile assembly of spherical AuNP monolayer within ...

  8. Review Article: The weak interactive characteristic of resonance cells and broadband effect of metamaterials

    SciTech Connect (OSTI)

    Zhao, Xiaopeng, E-mail: xpzhao@nwpu.edu.cn; Song, Kun [Smart Materials Laboratory, Department of Applied Physics, Northwestern Polytechnical University, Xi’an, 710129 (China)

    2014-10-15T23:59:59.000Z

    Metamaterials are artificial media designed to control electromagnetic wave propagation. Due to resonance, most present-day metamaterials inevitably suffer from narrow bandwidth, extremely limiting their practical applications. On the basis of tailored properties, a metamaterial within which each distinct unit cell resonates at its inherent frequency and has almost no coupling effect with the other ones, termed as weak interaction system, can be formulated. The total response of a weak interaction system can be treated as an overlap of the single resonance spectrum of each type of different unit cells. This intriguing feature therefore makes it possible to accomplish multiband or broadband metamaterials in a simple way. By introducing defects into metamaterials to form a weak interaction system, multiband and broadband electromagnetic metamaterials have first been experimentally demonstrated by our group. The similar concept can also be readily extended to acoustic and seismic metamaterials.

  9. Room temperature broadband terahertz gains in graphene heterostructures based on inter-layer radiative transitions

    SciTech Connect (OSTI)

    Tang, Linlong [Key Laboratory of High Energy Density Physics and Technology, College of Physics and Technology, Sichuan University, Chengdu, 610064 (China); Chongqing institute of green and intelligent technology, Chinese Academy of Sciences, Chongqing, 401122 (China); Du, Jinglei, E-mail: dujl@scu.edu.cn [Key Laboratory of High Energy Density Physics and Technology, College of Physics and Technology, Sichuan University, Chengdu, 610064 (China); Shi, Haofei, E-mail: shi@cigit.ac.cn; Wei, Dongshan; Du, Chunlei, E-mail: cldu@cigit.ac.cn [Chongqing institute of green and intelligent technology, Chinese Academy of Sciences, Chongqing, 401122 (China)

    2014-10-15T23:59:59.000Z

    We exploit inter-layer radiative transitions to provide gains to amplify terahertz waves in graphene heterostructures. This is achieved by properly doping graphene sheets and aligning their energy bands so that the processes of stimulated emissions can overwhelm absorptions. We derive an expression for the gain estimation and show the gain is insensitive to temperature variation. Moreover, the gain is broadband and can be strong enough to compensate the free carrier loss, indicating graphene based room temperature terahertz lasers are feasible.

  10. Broadband optical absorption by tunable Mie resonances in silicon nanocone arrays

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

    Wang, Z. Y.; Zhang, R. J.; Wang, S. Y.; Lu, M.; Chen, X.; Zheng, Y. X.; Chen, L. Y.; Ye, Z.; Wang, C. Z.; Ho, K. M.

    2015-01-15T23:59:59.000Z

    Nanostructure arrays such as nanowire, nanopillar, and nanocone arrays have been proposed to be promising antireflection structures for photovoltaic applications due to their great light trapping ability. In this paper, the optical properties of Si nanopillar and nanocone arrays in visible and infrared region were studied by both theoretical calculations and experiments. The results show that the Mie resonance can be continuously tuned across a wide range of wavelength by varying the diameter of the nanopillars. However, Si nanopillar array with uniform diameter exhibits only discrete resonance mode, thus can't achieve a high broadband absorption. On the other hand, themore »Mie resonance wavelength in a Si nanocone array can vary continuously as the diameters of the cross sections increase from the apex to the base. Therefore Si nanocone arrays can strongly interact with the incident light in the broadband spectrum and the absorbance by Si nanocone arrays is higher than 95% over the wavelength from 300 to 2000 nm. In addition to the Mie resonance, the broadband optical absorption of Si nanocone arrays is also affected by Wood-Rayleigh anomaly effect and metal impurities introduced in the fabrication process.« less

  11. Antenna-coupled silicon-organic hybrid integrated photonic crystal modulator for broadband electromagnetic wave detection

    E-Print Network [OSTI]

    Zhang, Xingyu; Subbaraman, Harish; Wang, Shiyi; Zhan, Qiwen; Luo, Jingdong; Jen, Alex K -Y; Chung, Chi-jui; Yan, Hai; Pan, Zeyu; Nelson, Robert L; Lee, Charles Y -C; Chen, Ray T

    2015-01-01T23:59:59.000Z

    In this work, we design, fabricate and characterize a compact, broadband and highly sensitive integrated photonic electromagnetic field sensor based on a silicon-organic hybrid modulator driven by a bowtie antenna. The large electro-optic (EO) coefficient of organic polymer, the slow-light effects in the silicon slot photonic crystal waveguide (PCW), and the broadband field enhancement provided by the bowtie antenna, are all combined to enhance the interaction of microwaves and optical waves, enabling a high EO modulation efficiency and thus a high sensitivity. The modulator is experimentally demonstrated with a record-high effective in-device EO modulation efficiency of r33=1230pm/V. Modulation response up to 40GHz is measured, with a 3-dB bandwidth of 11GHz. The slot PCW has an interaction length of 300um, and the bowtie antenna has an area smaller than 1cm2. The bowtie antenna in the device is experimentally demonstrated to have a broadband characteristics with a central resonance frequency of 10GHz, as we...

  12. ARM - Measurement - Longwave narrowband brightness temperature

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadap Documentation TDMADAP : XDC documentationBarrow,icegovMeasurementsLightningnarrowband

  13. ARM - Measurement - Longwave narrowband upwelling irradiance

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadap Documentation TDMADAP : XDCnarrowband upwelling irradiance ARM Data Discovery Browse Data

  14. ARM - Measurement - Longwave spectral brightness temperature

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadap Documentation TDMADAP : XDCnarrowband upwelling irradiance ARM Data Discovery Browse

  15. Long-Wave Infrared | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand Jump to: navigation, searchOf KilaueaInformation Other4Q07) Wind Farm Jump to:EnergyLong-Wave

  16. Broadband electromagnetic response and ultrafast dynamics of few-layer epitaxial graphene

    SciTech Connect (OSTI)

    Choi, Hyunyong; Borondics, Ferenc; Siegel, David A.; Zhou, Shuyun Y.; Martin, Michael C.; Lanzara, Alessandra; Kaindl, Robert A.

    2009-03-26T23:59:59.000Z

    We study the broadband optical conductivity and ultrafast carrier dynamics of epitaxial graphene in the few-layer limit. Equilibrium spectra of nominally buffer, monolayer, and multilayer graphene exhibit significant terahertz and near-infrared absorption, consistent with a model of intra- and interband transitions in a dense Dirac electron plasma. Non-equilibrium terahertz transmission changes after photoexcitation are shown to be dominated by excess hole carriers, with a 1.2-ps mono-exponential decay that refects the minority-carrier recombination time.

  17. Broadband impedance-matched electromagnetic structured ferrite composite in the megahertz range

    SciTech Connect (OSTI)

    Parke, L.; Hibbins, A. P.; Sambles, J. R. [Electromagnetic and Acoustic Materials Group, Department of Physics and Astronomy, University of Exeter, Stocker Road, Exeter, Devon EX4 4QL (United Kingdom); Youngs, I. J. [DSTL, Salisbury, Wiltshire SP4 0JQ (United Kingdom)

    2014-06-02T23:59:59.000Z

    A high refractive-index structured ferrite composite is designed to experimentally demonstrate broadband impedance matching to free-space. It consists of an array of ferrite cubes that are anisotropically spaced, thereby allowing for independent control of the effective complex permeability and permittivity. Despite having a refractive index of 9.5, the array gives less than 1% reflection and over 90% transmission of normally incident radiation up to 70?MHz for one of the orthogonal linear polarisations lying in a symmetry plane of the array. This result presents a route to the design of MHz-frequency ferrite composites with bespoke electromagnetic parameters for antenna miniaturisation.

  18. All-dielectric three-dimensional broadband Eaton lens with large refractive index range

    SciTech Connect (OSTI)

    Yin, Ming; Yong Tian, Xiao, E-mail: leoxyt@mail.xjtu.edu.cn; Ling Wu, Ling; Chen Li, Di [State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049 (China)

    2014-03-03T23:59:59.000Z

    We proposed a method to realize three-dimensional (3D) gradient index (GRIN) devices requiring large refractive index (RI) range with broadband performance. By combining non-resonant GRIN woodpile photonic crystals structure in the metamaterial regime with a compound liquid medium, a wide RI range (1–6.32) was fulfilled flexibly. As a proof-of-principle for the low-loss and non-dispersive method, a 3D Eaton lens was designed and fabricated based on 3D printing process. Full-wave simulation and experiment validated its omnidirectional wave bending effects in a broad bandwidth covering Ku band (12?GHz–18?GHz)

  19. Complementary chiral metasurface with strong broadband optical activity and enhanced transmission

    SciTech Connect (OSTI)

    Jia, Yan-Peng [Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, No. 29 Zhongguancun East Road, Beijing 100190 (China) [Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, No. 29 Zhongguancun East Road, Beijing 100190 (China); University of Chinese Academy of Sciences, Beijing 100190 (China); Zhang, Yong-Liang; Dong, Xian-Zi, E-mail: dongxianzi@mail.ipc.ac.cn, E-mail: xmduan@mail.ipc.ac.cn; Zheng, Mei-Ling; Li, Jing; Liu, Jie; Zhao, Zhen-Sheng [Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, No. 29 Zhongguancun East Road, Beijing 100190 (China)] [Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, No. 29 Zhongguancun East Road, Beijing 100190 (China); Duan, Xuan-Ming, E-mail: dongxianzi@mail.ipc.ac.cn, E-mail: xmduan@mail.ipc.ac.cn [Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, No. 29 Zhongguancun East Road, Beijing 100190 (China) [Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, No. 29 Zhongguancun East Road, Beijing 100190 (China); Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, No. 266 Fangzheng Ave, Shuitu Technology Development Zone, Beibei District, Chongqing 400714 (China)

    2014-01-06T23:59:59.000Z

    We present the design and realization of ultra-thin chiral metasurfaces with giant broadband optical activity in the infrared wavelength. The chiral metasurfaces consisting of periodic hole arrays of complementary asymmetric split ring resonators are fabricated by femtosecond laser two-photon polymerization. Enhanced transmission with strong polarization conversion up to 97% is observed owing to the chiral surface plasmons resulting from mirror symmetry broken. The dependence of optical activity on the degree of structural asymmetry is investigated. This simple planar metasurface is expected to be useful for designing ultra-thin active devices and tailoring the polarization behavior of complex metallic nanostructures.

  20. Index of /research/alcator/documentation/ICRF 5W Broadband Amplifier

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn Other News CommunityPortal8 [ICO] Name5W Broadband

  1. Microsoft Word - Broadband Over Power Lines_FINAL.06.01.10.doc

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHighandSWPA / SPRA / USACE SWPAURTeC:8 3. MarchFigure 1 StructureBroadband

  2. Broadband surface plasmon jets: direct observation of plasmon propagation for application to sensors and optical communications in microscale and nanoscale circuitry

    DOE Patents [OSTI]

    Bouhelier, Alexandre (Westmont, IL); Wiederrecht, Gary P. (Elmhurst, IL)

    2008-02-19T23:59:59.000Z

    A system and method for generating and using broadband surface plasmons in a metal film for characterization of analyte on or near the metal film. The surface plasmons interact with the analyte and generate leakage radiation which has spectral features which can be used to inspect, identify and characterize the analyte. The broadband plasmon excitation enables high-bandwidth photonic applications.

  3. RADIATION MEASUREMENTS BY BROOKHAVEN NATIONAL LABORATORY DURING THE WOODS HOLE OCEANOGRAPHIC INSTITUTION INTERCOMPARISON STUDY, MAY-JUNE 2000.

    SciTech Connect (OSTI)

    REYNOLDS, R.M.; BARTHOLOMEW, M.J.; MILLER, M.A.; SMITH, S.; EDWARDS, R.

    2000-12-01T23:59:59.000Z

    The WHOI buoy radiometer intercomparison took place during May and June, 2000 at the WHOI facility. The WHOI IMET, JAMSTEC Triton, and NOAA TAO buoy systems were operated from a beach site and the Brookhaven National Laboratory set up two Portable Radiation Package systems (P01 and P02) alongside the WHOI instrumentation on the roof of the Clark Building, about 300 m away. The BNL instruments were named ''P01'' and ''P02'' and were identical. Buoy instruments were all leveled to {+-}1{degree} to horizontal. The purpose of the project was to compare the buoy systems with precision measurements so that any differences in data collection or processing would be evaluated. BNL was pleased to participate so the PRP system could be evaluated as a calibration tool. The Portable Radiation Package is an integral component of the BNL Shipboard Oceanographic and Atmospheric Radiation (SOAR) system. It is designed to make accurate downwelling radiation measurements, including the three solar irradiance components (direct normal, diffuse and global) at six narrowband channels, aerosol optical depth measurements, and broadband longwave and shortwave irradiance measurements.

  4. Broadband Heating Rate Profile Project (BBHRP) - SGP 1bbhrpripbe1mcfarlane

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

    Riihimaki, Laura; Shippert, Timothy

    The objective of the ARM Broadband Heating Rate Profile (BBHRP) Project is to provide a structure for the comprehensive assessment of our ability to model atmospheric radiative transfer for all conditions. Required inputs to BBHRP include surface albedo and profiles of atmospheric state (temperature, humidity), gas concentrations, aerosol properties, and cloud properties. In the past year, the Radiatively Important Parameters Best Estimate (RIPBE) VAP was developed to combine all of the input properties needed for BBHRP into a single gridded input file. Additionally, an interface between the RIPBE input file and the RRTM was developed using the new ARM integrated software development environment (ISDE) and effort was put into developing quality control (qc) flags and provenance information on the BBHRP output files so that analysis of the output would be more straightforward. This new version of BBHRP, sgp1bbhrpripbeC1.c1, uses the RIPBE files as input to RRTM, and calculates broadband SW and LW fluxes and heating rates at 1-min resolution using the independent column approximation. The vertical resolution is 45 m in the lower and middle troposphere to match the input cloud properties, but is at coarser resolution in the upper atmosphere. Unlike previous versions, the vertical grid is the same for both clear-sky and cloudy-sky calculations.

  5. BRIGHT BROADBAND AFTERGLOWS OF GRAVITATIONAL WAVE BURSTS FROM MERGERS OF BINARY NEUTRON STARS

    SciTech Connect (OSTI)

    Gao He; Ding Xuan; Wu Xuefeng [Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008 (China); Zhang Bing [Department of Physics and Astronomy, University of Nevada, Las Vegas, NV 89154 (United States); Dai Zigao, E-mail: xfwu@pmo.ac.cn, E-mail: zhang@physics.unlv.edu, E-mail: dzg@nju.edu.cn [School of Astronomy and Space Science, Nanjing University, Nanjing 210093 (China)

    2013-07-10T23:59:59.000Z

    If double neutron star mergers leave behind a massive magnetar rather than a black hole, then a bright early afterglow can follow the gravitational wave burst (GWB) even if there is no short gamma-ray burst (SGRB)-GWB association or if there is an association but the SGRB does not beam toward Earth. Besides directly dissipating the proto-magnetar wind, as suggested by Zhang, here we suggest that the magnetar wind could push the ejecta launched during the merger process and, under certain conditions, would reach a relativistic speed. Such a magnetar-powered ejecta, when interacting with the ambient medium, would develop a bright broadband afterglow due to synchrotron radiation. We study this physical scenario in detail and present the predicted X-ray, optical, and radio light curves for a range of magnetar and ejecta parameters. We show that the X-ray and optical light curves usually peak around the magnetar spin-down timescale ({approx}10{sup 3}-10{sup 5} s), reaching brightnesses readily detectable by wide-field X-ray and optical telescopes, and remain detectable for an extended period. The radio afterglow peaks later, but is much brighter than the case without a magnetar energy injection. Therefore, such bright broadband afterglows, if detected and combined with GWBs in the future, would be a probe of massive millisecond magnetars and stiff equations of state for nuclear matter.

  6. Graphene based tunable fractal Hilbert curve array broadband radar absorbing screen for radar cross section reduction

    SciTech Connect (OSTI)

    Huang, Xianjun, E-mail: xianjun.huang@manchester.ac.uk [School of Electrical and Electronic Engineering, University of Manchester, Manchester M13 9PL (United Kingdom); College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073 (China); Hu, Zhirun [School of Electrical and Electronic Engineering, University of Manchester, Manchester M13 9PL (United Kingdom); Liu, Peiguo [College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073 (China)

    2014-11-15T23:59:59.000Z

    This paper proposes a new type of graphene based tunable radar absorbing screen. The absorbing screen consists of Hilbert curve metal strip array and chemical vapour deposition (CVD) graphene sheet. The graphene based screen is not only tunable when the chemical potential of the graphene changes, but also has broadband effective absorption. The absorption bandwidth is from 8.9GHz to 18.1GHz, ie., relative bandwidth of more than 68%, at chemical potential of 0eV, which is significantly wider than that if the graphene sheet had not been employed. As the chemical potential varies from 0 to 0.4eV, the central frequency of the screen can be tuned from 13.5GHz to 19.0GHz. In the proposed structure, Hilbert curve metal strip array was designed to provide multiple narrow band resonances, whereas the graphene sheet directly underneath the metal strip array provides tunability and averagely required surface resistance so to significantly extend the screen operation bandwidth by providing broadband impedance matching and absorption. In addition, the thickness of the screen has been optimized to achieve nearly the minimum thickness limitation for a nonmagnetic absorber. The working principle of this absorbing screen is studied in details, and performance under various incident angles is presented. This work extends applications of graphene into tunable microwave radar cross section (RCS) reduction applications.

  7. Efficient photon extraction from a quantum dot in a broad-band planar cavity antenna

    SciTech Connect (OSTI)

    Ma, Yong, E-mail: y.ma@hw.ac.uk; Kremer, Peter E.; Gerardot, Brian D., E-mail: B.D.Gerardot@hw.ac.uk [Institute of Photonics and Quantum Sciences, SUPA, Heriot-Watt University, Edinburgh EH14 4AS (United Kingdom)

    2014-01-14T23:59:59.000Z

    We analyse the extraction of photons emitted from single InAs quantum dots embedded in planar microcavities. The structures are designed to achieve broad-band operation and high-collection efficiency from a device requiring straightforward fabrication, even with electrical contacts. The designs consist of a quantum dot in a GaAs membrane with asymmetric top and bottom mirrors and a top-side solid immersion lens (SIL). Four separate cases are considered in our design: a GaAs membrane only (case 1), GaAs membrane with a glass SIL on top (case 2), a GaAs membrane with a glass SIL on top and a back mirror consisting of Au (case 3), a GaAs membrane with a glass SIL on top of a distribute Bragg reflector mirror and Au back mirror (case 4). Both finite difference time domain and analytical simulations are used to calculate the electric field, power density, and far-field radiation pattern. For optimized structures (case 4), we obtain significant extraction efficiencies (>50%) with modest Purcell enhancements (?20%) and a large spectral full-width-half-maximum (>100?nm). The high-extraction efficiency, broad-band operation, and facile fabrication make the proposed structures promising for realistic quantum dot devices.

  8. Broadband Heating Rate Profile Project (BBHRP) - SGP 1bbhrpripbe1mcfarlane

    SciTech Connect (OSTI)

    Riihimaki, Laura; Shippert, Timothy

    2014-11-05T23:59:59.000Z

    The objective of the ARM Broadband Heating Rate Profile (BBHRP) Project is to provide a structure for the comprehensive assessment of our ability to model atmospheric radiative transfer for all conditions. Required inputs to BBHRP include surface albedo and profiles of atmospheric state (temperature, humidity), gas concentrations, aerosol properties, and cloud properties. In the past year, the Radiatively Important Parameters Best Estimate (RIPBE) VAP was developed to combine all of the input properties needed for BBHRP into a single gridded input file. Additionally, an interface between the RIPBE input file and the RRTM was developed using the new ARM integrated software development environment (ISDE) and effort was put into developing quality control (qc) flags and provenance information on the BBHRP output files so that analysis of the output would be more straightforward. This new version of BBHRP, sgp1bbhrpripbeC1.c1, uses the RIPBE files as input to RRTM, and calculates broadband SW and LW fluxes and heating rates at 1-min resolution using the independent column approximation. The vertical resolution is 45 m in the lower and middle troposphere to match the input cloud properties, but is at coarser resolution in the upper atmosphere. Unlike previous versions, the vertical grid is the same for both clear-sky and cloudy-sky calculations.

  9. Hyperbolic-metamaterial antennas for broadband enhancement of dipole emission to free space

    SciTech Connect (OSTI)

    Valagiannopoulos, C. A. [Department of Radio Science and Engineering, School of Electrical Engineering, Aalto University, P.O. Box 13000, FI-00076 Aalto (Finland); Department of Electrical and Computer Engineering, University of Texas at Austin, 1616 Guadalupe St., Texas 78712 (United States); Mirmoosa, M. S.; Nefedov, I. S.; Tretyakov, S. A.; Simovski, C. R. [Department of Radio Science and Engineering, School of Electrical Engineering, Aalto University, P.O. Box 13000, FI-00076 Aalto (Finland)

    2014-10-28T23:59:59.000Z

    Dipole emitters used in nano optics and nanophotonics (e.g., fluorescent molecules or quantum dots) are weak radiators and thus detecting the radiation of a single emitter gets possible only if it is significantly enhanced. For this enhancement, one often utilizes resonant nanoantennas (Purcell's effect); this method, however, requires the exact knowledge of source location and radiation frequency which constitute a significant drawback. One known possibility for broadband location-insensitive radiation enhancement is to use a layer of the so-called hyperbolic metamaterial. However, the enhanced radiated energy is mainly directed into the volume of the lossy medium, where it is lost to heating. In this work, we suggest specific shapes of macroscopic hyperbolic metamaterial samples to open radiation windows for enhanced radiation to free space. We show that hyperbolic media slabs with properly shaped macroscopic grooves convert the evanescent waves produced by a dipole into waves traveling in free space, which results in the enhancement of useful radiation by one to two orders of magnitude. That level of enhancement of radiation into free-space which is also wideband and of non-resonant nature has not been reported up to now. These results may open possibilities for realization of broadband and directive antennas, where the primary radiators are randomly positioned fluorescent molecules or quantum dots.

  10. Fault Process and Broadband Ground-Motion Simulations of the 23 October 2011 Van (Eastern Turkey) Earthquake

    E-Print Network [OSTI]

    Cerveny, Vlastislav

    Fault Process and Broadband Ground-Motion Simulations of the 23 October 2011 Van (Eastern Turkey Abstract On 23 October 2011 an Mw 7.1 earthquake occurred in eastern Turkey, close to the towns of Van.1 Van earthquake occurred on 23 October 2011 in eastern Turkey, close to the towns of Van and Erci

  11. Transmission Channel Model and Capacity of Overhead Multi-conductor Medium-Voltage Power-lines for Broadband Communications

    E-Print Network [OSTI]

    Kavehrad, Mohsen

    Transmission Channel Model and Capacity of Overhead Multi-conductor Medium-Voltage Power-lines signal transmission, power-line has many non-ideal properties as a communications medium. Impedance-voltage power distribution networks for broadband power-line communications applications. Keywords - channel

  12. IEEE JOURNAL OF SOLID-STATE CIRCUITS, VOL. 45, NO. 12, DECEMBER 2010 2709 A CMOS Broadband Power Amplifier With

    E-Print Network [OSTI]

    Hajimiri, Ali

    bandwidth, optimum load impedance, power amplifier, transformer. I. INTRODUCTION CMOS technology offers, the output matching network for a CMOS PA requires a large impedance transformation ratio to generate highIEEE JOURNAL OF SOLID-STATE CIRCUITS, VOL. 45, NO. 12, DECEMBER 2010 2709 A CMOS Broadband Power

  13. Modal analysis of the range evolution of broadband wavefields in the North Pacific Ocean: Low mode numbers

    E-Print Network [OSTI]

    Frandsen, Jannette B.

    Modal analysis of the range evolution of broadband wavefields in the North Pacific Ocean: Low mode North Pacific Ocean are reported here. Transient wavefields in the 50­90 Hz band that were recorded numbers Ilya A. Udovydchenkova) Applied Ocean Physics and Engineering Department, Woods Hole Oceanographic

  14. REVIEW OF SCIENTIFIC INSTRUMENTS 84, 034706 (2013) In situ broadband cryogenic calibration for two-port superconducting

    E-Print Network [OSTI]

    Anlage, Steven

    2013-01-01T23:59:59.000Z

    beam with high efficiency because super- conducting resonators can store the energy with very low loss-port superconducting microwave resonators Jen-Hao Yeh1,2,a) and Steven M. Anlage1,2 1 Electrical and Computer of this in situ broadband cryogenic calibration system utilizing cryogenic switches. All calibration measurements

  15. Broadband and Monochromatic X-ray Irradiation of Platinum: Monte Carlo Simulations for Dose Enhancement Factors and Resonant Theranostics

    E-Print Network [OSTI]

    Nahar, Sultana Nurun

    Enhancement Factors and Resonant Theranostics S. Lim1 , M.Montenegro2 , A.K. Pradhan1, 3 , S.N. Nahar3 , E with platinum as an agent for killing cancerous cells via increased linear-energy-transfer (LET) and dose enhancement. We also describe a simple de- vice for broadband-to-monochromatic (B2M) conversion. Materials

  16. IEEE COMUNICATIONS MAGAZINE SUBMITTED (BROADBAND ACCESS SERIES MARCH 2002) 1 Technologies and Performance for Non-Line-of-Sight

    E-Print Network [OSTI]

    Gesbert, David

    technologies on the overall performance. Keywords-- Broadband wireless, fixed access, Internet, smart antennas of such access systems is to provide wireless high speed Internet access, and in relevant markets voice ser- vices, to fixed or nomadic residential customers and small offices/home offices (SOHO) located within

  17. Broadband, noise-free optical quantum memory with neutral nitrogen-vacancy centers in diamond

    E-Print Network [OSTI]

    E. Poem; C. Weinzetl; J. Klatzow; K. T. Kaczmarek; J. H. D. Munns; T. F. M. Champion; D. J. Saunders; J. Nunn; I. A. Walmsley

    2015-01-11T23:59:59.000Z

    It is proposed that the ground-state manifold of the neutral nitrogen-vacancy center in diamond could be used as a quantum two-level system in a solid-state-based implementation of a broadband, noise-free quantum optical memory. The proposal is based on the same-spin $\\Lambda$-type three level system created between the two E orbital ground states and the A$_1$ orbital excited state of the center, and the cross-linear polarization selection rules obtained with the application of transverse electric field or uniaxial stress. Possible decay and decoherence mechanisms of this system are discussed, and it is shown that high efficiency, noise-free storage of photons with a bandwidth of a few tens of GHz for a few tens of nanoseconds would be possible at low temperature.

  18. Broadband asymmetric acoustic transmission by a plate with quasi-periodic surface ridges

    SciTech Connect (OSTI)

    Li, Chunhui; Ke, Manzhu, E-mail: mzke@whu.edu.cn; Ye, Yangtao; Xu, Shengjun; Qiu, Chunyin; Liu, Zhengyou [Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072 (China)

    2014-07-14T23:59:59.000Z

    In this paper, an acoustic system with broadband asymmetric transmission is designed and fabricated, which consists of a water-immersed aluminum plate engraved with quasi-periodically-patterned ridges on single surface. It demonstrates that when the acoustic waves are launched into the system from the structured side, they can couple into the Lamb modes in the plate efficiently and attain a high transmission; on the contrary, when the waves are incident from the opposite flat side, the coupling is weak, and the transmission is low. Superior to systems with periodic patterning, this quasi-periodically-patterned system has a broad working frequency range due to the collective contributions from the multiple diffractions specific to the structure.

  19. BROADBAND ANTENNA MATCHING NETWORK DESIGN AND APPLICATION FOR RF PLASMA ION SOURCE

    SciTech Connect (OSTI)

    Shin, Ki [ORNL; Kang, Yoon W [ORNL; Piller, Chip [ORNL; Fathy, Aly [University of Tennessee, Knoxville (UTK)

    2011-01-01T23:59:59.000Z

    The RF ion source at Spallation Neutron Source has been upgraded to meet higher beam power requirement. One important subsystem for efficient operation of the ion source is the 2MHz RF impedance matching network. The real part of the antenna impedance is very small and is affected by plasma density for 2MHz operating frequency. Previous impedance matching network for the antenna has limited tuning capability to cover this potential variation of the antenna impedance since it employed a single tuning element and an impedance transformer. A new matching network with two tunable capacitors has been built and tested. This network can allow precision matching and increase the tunable range without using a transformer. A 5-element broadband matching network also has been designed, built and tested. The 5-element network allows wide band matching up to 50 kHz bandwidth from the resonance center of 2 MHz. The design procedure, simulation and test results are presented.

  20. In situ broadband cryogenic calibration for two-port superconducting microwave resonators

    SciTech Connect (OSTI)

    Yeh, Jen-Hao; Anlage, Steven M. [Electrical and Computer Engineering Department, University of Maryland, College Park, Maryland 20742-3285 (United States); CNAM, Physics Department, University of Maryland, College Park, Maryland 20742-4111 (United States)

    2013-03-15T23:59:59.000Z

    We introduce an improved microwave calibration method for use in a cryogenic environment, based on a traditional three-standard calibration, the Thru-Reflect-Line (TRL) calibration. The modified calibration method takes advantage of additional information from multiple measurements of an ensemble of realizations of a superconducting resonator, as a new pseudo-Open standard, to correct errors in the TRL calibration. We also demonstrate an experimental realization of this in situ broadband cryogenic calibration system utilizing cryogenic switches. All calibration measurements are done in the same thermal cycle as the measurement of the resonator (requiring only an additional 20 min), thus avoiding 4 additional thermal cycles for traditional TRL calibration (which would require an additional 12 days). The experimental measurements on a wave-chaotic microwave billiard verify that the new method significantly improves the measured scattering matrix of a high-quality-factor superconducting resonator.

  1. In-situ Broadband Cryogenic Calibration for Two-port Superconducting Microwave Resonators

    E-Print Network [OSTI]

    Yeh, Jen-Hao

    2012-01-01T23:59:59.000Z

    In this paper we introduce an improved microwave calibration method for use in a cryogenic environment, based on a traditional three-standard calibration, the Thru-Reflection-Line (TRL) calibration. The modified calibration method takes advantage of additional information from multiple measurements of an ensemble of realizations of a superconducting resonator, as a new pseudo-Open standard, to correct errors in the TRL calibration. We also demonstrate an experimental realization of this in-situ broadband cryogenic calibration system utilizing cryogenic switches. All calibration measurements are done in the same thermal cycle as the measurement of the resonator (requiring only an additional 20 minutes), thus avoiding 4 additional thermal cycles for traditional TRL calibration (which would require an additional 12 days). The experimental measurements on a wave chaotic microwave billiard verify that the new method significantly improves the measured scattering matrix of a high-quality-factor superconducting reso...

  2. In-situ Broadband Cryogenic Calibration for Two-port Superconducting Microwave Resonators

    E-Print Network [OSTI]

    Jen-Hao Yeh; Steven M. Anlage

    2013-03-10T23:59:59.000Z

    We introduce an improved microwave calibration method for use in a cryogenic environment, based on a traditional three-standard calibration, the Thru-Reflect-Line (TRL) calibration. The modified calibration method takes advantage of additional information from multiple measurements of an ensemble of realizations of a superconducting resonator, as a new pseudo-Open standard, to correct errors in the TRL calibration. We also demonstrate an experimental realization of this in-situ broadband cryogenic calibration system utilizing cryogenic switches. All calibration measurements are done in the same thermal cycle as the measurement of the resonator (requiring only an additional 20 minutes), thus avoiding 4 additional thermal cycles for traditional TRL calibration (which would require an additional 12 days). The experimental measurements on a wave-chaotic microwave billiard verify that the new method significantly improves the measured scattering matrix of a high-quality-factor superconducting resonator.

  3. The RCT 1.3-meter Robotic Telescope: Broad-band Color Transformation and Extinction Calibration

    E-Print Network [OSTI]

    Strolger, Louis-Gregory; Carini, Michael; Engle, Scott; Gelderman, Richard; Guinan, Edward; Laney, C David; McGruder, Charles; Treffers, Richard R; Walter, Donald K

    2013-01-01T23:59:59.000Z

    The RCT 1.3-meter telescope, formerly known as the Kitt Peak National Observatory (KPNO) 50-inch telescope, has been refurbished as a fully robotic telescope, using an autonomous scheduler to take full advantage of the observing site without the requirement of a human presence. Here we detail the current configuration of the RCT, and present as a demonstration of its high-priority science goals, the broadband {\\it UBVRI} photometric calibration of the optical facility. In summary, we find the linear color transformation and extinction corrections to be consistent with similar optical KPNO facilities, to within a photometric precision of 10% (at $1\\sigma$). While there were identified instrumental errors likely adding to the overall uncertainty, associated with since-resolved issues in engineering and maintenance of the robotic facility, a preliminary verification of this calibration gave good indication that the solution is robust, perhaps to a higher precision than this initial calibration implies. The RCT h...

  4. An efficient approach to unstructured mesh hydrodynamics on the cell broadband engine (u)

    SciTech Connect (OSTI)

    Ferenbaugh, Charles R [Los Alamos National Laboratory

    2010-12-14T23:59:59.000Z

    Unstructured mesh physics for the Cell Broadband Engine (CBE) has received little or no attention to date, largely because the CBE architecture poses particular challenges for unstructured mesh algorithms. SPU memory management strategies such as data preloading cannot be applied to the irregular memory storage patterns of unstructured meshes; and the SPU vector instruction set does not support the indirect addressing needed by connectivity arrays. This paper presents an approach to unstructured mesh physics that addresses these challenges, by creating a new mesh data structure and reorganizing code to give efficient CBE performance. The approach is demonstrated on the FLAG production hydrodynamics code using standard test problems, and results show an average speedup of more than 5x over the original code.

  5. Role of size and defects in ultrafast broadband emission dynamics of ZnO nanostructures

    SciTech Connect (OSTI)

    Appavoo, Kannatassen; Liu, Mingzhao; Sfeir, Matthew Y., E-mail: msfeir@bnl.gov [Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973 (United States)

    2014-03-31T23:59:59.000Z

    As wide bandgap materials are nanostructured for optoelectronics and energy technologies, understanding how size and defects modify the carrier dynamics becomes critical. Here, we examine broadband ultraviolet-visible subpicosecond emission dynamics of prototypical ZnO in bulk, nanowire and nanosphere geometries. Using a high-sensitivity transient emission Kerr-based spectrometer, we probe exciton dynamics in the low fluence regime to determine how defects states impact thermalization and recombination rates. In contrast to steady-state measurements, we transiently identify low-energy emission features that originate from localized excitonic states rather than mid-gap states, characterized by distinct recombination kinetics, and correlate to longer thermalization times. These states are critical for understanding the overall excited state lifetime of materials in this size regime, where crystallinity rather than dimensionality plays a primary role in dictating recombination dynamics.

  6. Time-resolved broadband cavity-enhanced absorption spectroscopy for chemical kinetics.

    SciTech Connect (OSTI)

    Sheps, Leonid; Chandler, David W.

    2013-04-01T23:59:59.000Z

    Experimental measurements of elementary reaction rate coefficients and product branching ratios are essential to our understanding of many fundamentally important processes in Combustion Chemistry. However, such measurements are often impossible because of a lack of adequate detection techniques. Some of the largest gaps in our knowledge concern some of the most important radical species, because their short lifetimes and low steady-state concentrations make them particularly difficult to detect. To address this challenge, we propose a novel general detection method for gas-phase chemical kinetics: time-resolved broadband cavity-enhanced absorption spectroscopy (TR-BB-CEAS). This all-optical, non-intrusive, multiplexed method enables sensitive direct probing of transient reaction intermediates in a simple, inexpensive, and robust experimental package.

  7. Cascading metallic gratings for broadband absorption enhancement in ultrathin plasmonic solar cells

    SciTech Connect (OSTI)

    Wen, Long; Sun, Fuhe [Key Laboratory of Nanodevices and Applications-CAS and Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (CAS), Suzhou 215123 (China); Chen, Qin, E-mail: qchen2012@sinano.ac.cn [Key Laboratory of Nanodevices and Applications-CAS and Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (CAS), Suzhou 215123 (China); Peking University Shenzhen SOC Key Laboratory, PKU-HKUST Shenzhen-Hong Kong Institute, Hi-Tech Industrial Park South, Shenzhen 518057 (China)

    2014-04-14T23:59:59.000Z

    The incorporation of plasmonic nanostructures in the thin-film solar cells (TFSCs) is a promising route to harvest light into the nanoscale active layer. However, the light trapping scheme based on the plasmonic effects intrinsically presents narrow-band resonant enhancement of light absorption. Here we demonstrate that by cascading metal nanogratings with different sizes atop the TFSCs, broadband absorption enhancement can be realized by simultaneously exciting multiple localized surface plasmon resonances and inducing strong coupling between the plasmonic modes and photonic modes. As a proof of concept, we demonstrate of 66.5% in the photocurrent in an ultrathin amorphous silicon TFSC with two-dimensional cascaded gratings over the reference cell without gratings.

  8. Development of a ten inch manipulators-based, flexible, broadband two-crystal spectrometer

    SciTech Connect (OSTI)

    Steel, A. B., E-mail: steel1@llnl.gov; Dunn, J.; Emig, J.; Beiersdorfer, P.; Brown, G. V.; Shepherd, R.; Marley, E. V. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Hoarty, D. J. [Atomic Weapons Establishment, Aldermaston (United Kingdom)

    2014-11-15T23:59:59.000Z

    We have developed and implemented a broadband X-ray spectrometer with a variable energy range for use at the Atomic Weapons Establishment's Orion Laser. The spectrometer covers an energy bandwidth of ?1–2 keV using two independently mounted, movable Bragg diffraction crystals. Using combinations of cesium hydrogen pthlate, ammonium dihydrogen phosphate, and pentaerythritol crystals, spectra covering the 1.4–2.5, 1.85–3.15, or 3.55–5.1 keV energy bands have been measured. Image plate is used for detection owing to its high dynamic range. Background signals caused by high energy X-rays and particles commonly produced in high energy laser experiments are reduced by a series of tantalum baffles and filters installed between the source and crystal and also between the crystals and detector.

  9. Investigating Broadband Variability of the TeV Blazar 1ES 1959+650

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

    Aliu, E.; Archambault, S.; Arlen, T.; Aune, T.; Barnacka, A.; Beilicke, M.; Benbow, W.; Berger, K.; Bird, R.; Bouvier, A.; et al

    2014-12-03T23:59:59.000Z

    We summarize broadband observations of the TeV-emitting blazar 1ES 1959 650, including optical R-band observations by the robotic telescopes Super-LOTIS and iTelescope, UV observations by Swift Ultraviolet and Optical Telescope, X-ray observations by the Swift X-ray Telescope, high-energy gamma-ray observations with the Fermi Large Area Telescope, and very-high-energy (VHE) gamma-ray observations by VERITAS above 315 GeV, all taken between 2012 April 17 and 2012 June 1 (MJD 56034 and 56079). The contemporaneous variability of the broadband spectral energy distribution is explored in the context of a simple synchrotron self Compton (SSC) model. In the SSC emission scenario, we find thatmore »the parameters required to represent the high state are significantly different than those in the low state. Motivated by possible evidence of gas in the vicinity of the blazar, we also investigate a reflected emission model to describe the observed variability pattern. This model assumes that the non-thermal emission from the jet is reflected by a nearby cloud of gas, allowing the reflected emission to re-enter the blob and produce an elevated gamma-ray state with no simultaneous elevated synchrotron flux. The model applied here, although not required to explain the observed variability pattern, represents one possible scenario which can describe the observations. As applied to an elevated VHE state of 66% of the Crab Nebula flux, observed on a single night during the observation period, the reflected emission scenario does not support a purely leptonic non-thermal emission mechanism. The reflected model does, however, predict a reflected photon field with sufficient energy to enable elevated gamma-ray emission via pion production with protons of energies between 10 and 100 TeV.« less

  10. Investigating Broadband Variability of the TeV Blazar 1ES 1959+650

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

    Aliu, E. [Columbia Univ., NY (United States). Barnard College; Archambault, S. [McGill Univ., Montreal, Quebec (Canada); Arlen, T. [Univ. of California, Los Angeles, CA (United States); Aune, T. [Univ. of California, Los Angeles, CA (United States); Barnacka, A. [Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States); Beilicke, M. [Washington Univ., St. Louis, MO (United States); Benbow, W.; Berger, K.; Bird, R.; Bouvier, A.; Buckley, J. H. [Washington Univ., St. Louis, MO (United States); Bugaev, V.; Cerruti, M.; Chen, X.; Ciupik, L.; Collins-Hughes, E.; Connolly, M. P.; Cui, W.; Dumm, J.; Eisch, J. D.; Falcone, A.; Federici, S.; Feng, Q.; Finley, J. P.; Fleischhack, H.; Hanna, D.; Holder, J.; Hughes, G.; Hughes, Z.; Humensky, T. B.; Johnson, C. A.; Kaaret, P.; Kar, P.; Kertzman, M.; Khassen, Y.; Kieda, D.; Krawczynski, H.; Krennrich, F.; Lang, M. J.; Madhavan, A. S.; Majumdar, P.; McArthur, S.; McCann, A.; Meagher, K.; Millis, J.; Moriarty, P.; Mukherjee, R.; Nelson, T.; Nieto, D.; O'Faolain de Bhroithe, A.; Ong, R. A.; Otte, A. N.; Park, N.; Perkins, J. S.; Pohl, M.; Popkow, A.; Prokoph, H.; Quinn, J.; Ragan, K.; Rajotte, J.; Reyes, L. C.; Reynolds, P. T.; Richards, G. T.; Roache, E.; Sadun, A.; Santander, M.; Sembroski, G. H.; Shahinyan, K.; Sheidaei, F.; Smith, A. W.; Staszak, D.; Telezhinsky, I.; Theiling, M.; Tyler, J.; Varlotta, A.; Vassiliev, V. V.; Vincent, S.; Wakeley, S. P.; Weekes, T. C.; Weinstein, A.; Welsing, R.; Wilhelm, A.; Williams, D. A.; Zitzer, B.; Boettcher, M. [North-West University, Centre for Space Research, Potchefstroom (South Africa); Fumagalli, M. [Carnegie Observatories, Pasadena, CA (United States); Princeton Univ., NJ (United States)

    2014-12-03T23:59:59.000Z

    We summarize broadband observations of the TeV-emitting blazar 1ES 1959 650, including optical R-band observations by the robotic telescopes Super-LOTIS and iTelescope, UV observations by Swift Ultraviolet and Optical Telescope, X-ray observations by the Swift X-ray Telescope, high-energy gamma-ray observations with the Fermi Large Area Telescope, and very-high-energy (VHE) gamma-ray observations by VERITAS above 315 GeV, all taken between 2012 April 17 and 2012 June 1 (MJD 56034 and 56079). The contemporaneous variability of the broadband spectral energy distribution is explored in the context of a simple synchrotron self Compton (SSC) model. In the SSC emission scenario, we find that the parameters required to represent the high state are significantly different than those in the low state. Motivated by possible evidence of gas in the vicinity of the blazar, we also investigate a reflected emission model to describe the observed variability pattern. This model assumes that the non-thermal emission from the jet is reflected by a nearby cloud of gas, allowing the reflected emission to re-enter the blob and produce an elevated gamma-ray state with no simultaneous elevated synchrotron flux. The model applied here, although not required to explain the observed variability pattern, represents one possible scenario which can describe the observations. As applied to an elevated VHE state of 66% of the Crab Nebula flux, observed on a single night during the observation period, the reflected emission scenario does not support a purely leptonic non-thermal emission mechanism. The reflected model does, however, predict a reflected photon field with sufficient energy to enable elevated gamma-ray emission via pion production with protons of energies between 10 and 100 TeV.

  11. Ultra-bright, ultra-broadband hard x-ray driven by laser-produced energetic electron beams

    SciTech Connect (OSTI)

    Shi, Yin; Shen, Baifei; Zhang, Xiaomei; Wang, Wenpeng; Ji, Liangliang; Zhang, Lingang; Xu, Jiancai; Yu, Yahong; Zhao, Xueyan; Wang, Xiaofeng; Yi, Longqing; Xu, Tongjun; Xu, Zhizhan [State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800 (China)] [State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800 (China)

    2013-09-15T23:59:59.000Z

    We propose a new method of obtaining a compact ultra-bright, ultra-broadband hard X-ray source. This X-ray source has a high peak brightness in the order of 10{sup 22} photons/(s mm{sup 2} mrad{sup 2} 0.1\\%BW), an ultrashort duration (10 fs), and a broadband spectrum (flat distribution from 0.1 MeV to 4 MeV), and thus has wide-ranging potential applications, such as in ultrafast Laue diffraction experiments. In our scheme, laser-plasma accelerators (LPAs) provide driven electron beams. A foil target is placed oblique to the beam direction so that the target normal sheath field (TNSF) is used to provide a bending force. Using this TNSF-kick scheme, we can fully utilize the advantages of current LPAs, including their high charge, high energy, and low emittance.

  12. Broadband Spectral Properties of Bright High-Energy Gamma-Ray Bursts Observed with BATSE and EGRET

    E-Print Network [OSTI]

    Kaneko, Y; Preece, R; Dingus, B L; Briggs, M S

    2008-01-01T23:59:59.000Z

    We present the spectral analysis of duration-integrated broadband spectra (in $\\sim30 $keV$-200 $MeV) of 15 bright BATSE gamma-ray bursts (GRBs). Some GRB spectra are very hard, with their spectral peak energies being above the BATSE LAD passband limit of $\\sim$2 MeV. In such cases, their high-energy spectral parameters (peak energy and high-energy power-law indices) cannot be adequately constrained by BATSE LAD data alone. A few dozen bright BATSE GRBs were also observed with EGRET's calorimeter, TASC, in multi-MeV energy band, with a large effective area and fine energy resolution. Combining the BATSE and TASC data, therefore, affords spectra that span four decades of energy ($30 $keV$-200 $MeV), allowing for a broadband spectral analysis with good statistics. Studying such broadband high-energy spectra of GRB prompt emission is crucial, as they provide key clues to understanding its gamma-ray emission mechanism. Among the 15 GRB spectra, we found two cases with a significant high-energy excess, and another...

  13. The RCT 1.3 m robotic telescope: broadband color transformation and extinction calibration

    SciTech Connect (OSTI)

    Strolger, L.-G.; Gott, A. M.; Carini, M.; Gelderman, R.; Laney, C. D.; McGruder, C. [Western Kentucky University, Bowling Green, KY 42101 (United States); Engle, S.; Guinan, E. [Villanova University, Villanova, PA 19085 (United States); Treffers, R. R. [Starman Systems, LLC, Alamo, CA 94507 (United States); Walter, D. K., E-mail: strolger@stsci.edu [South Carolina State University, Orangeburg, SC 29117 (United States)

    2014-03-01T23:59:59.000Z

    The Robotically Controlled Telescope (RCT) 1.3 m telescope, formerly known as the Kitt Peak National Observatory (KPNO) 50 inch telescope, has been refurbished as a fully robotic telescope, with an autonomous scheduler to take full advantage of the observing site without the requirement of a human presence. Here we detail the current configuration of the RCT and present, as a demonstration of its high-priority science goals, the broadband UBVRI photometric calibration of the optical facility. In summary, we find the linear color transformation and extinction corrections to be consistent with similar optical KPNO facilities, to within a photometric precision of 10% (at 1?). While there were identified instrumental errors that likely added to the overall uncertainty, associated with since-resolved issues in engineering and maintenance of the robotic facility, a preliminary verification of this calibration gave a good indication that the solution is robust, perhaps to a higher precision than this initial calibration implies. The RCT has been executing regular science operations since 2009 and is largely meeting the science requirements set during its acquisition and redesign.

  14. EXAMINING THE BROADBAND EMISSION SPECTRUM OF WASP-19b: A NEW z-BAND ECLIPSE DETECTION

    SciTech Connect (OSTI)

    Zhou, George; Bayliss, Daniel D. R. [Research School of Astronomy and Astrophysics, Australian National University, Cotter Rd, Weston Creek, ACT 2611 (Australia); Kedziora-Chudczer, Lucyna; Bailey, Jeremy, E-mail: george@mso.anu.edu.au [School of Physics, University of New South Wales, Sydney, NSW 2052 (Australia)

    2013-09-10T23:59:59.000Z

    WASP-19b is one of the most irradiated hot-Jupiters known. Its secondary eclipse is the deepest of all transiting planets and has been measured in multiple optical and infrared bands. We obtained a z-band eclipse observation with a measured depth of 0.080% {+-} 0.029%, using the 2 m Faulkes Telescope South, which is consistent with the results of previous observations. We combined our measurement of the z-band eclipse with previous observations to explore atmosphere models of WASP-19b that are consistent with its broadband spectrum. We use the VSTAR radiative transfer code to examine the effect of varying pressure-temperature profiles and C/O abundance ratios on the emission spectrum of the planet. We find that models with super-solar carbon enrichment best match the observations, which is consistent with previous model retrieval studies. We also include upper atmosphere haze as another dimension in the interpretation of exoplanet emission spectra and find that particles <0.5 {mu}m in size are unlikely to be present in WASP-19b.

  15. An integrated processor for photonic quantum states using a broadband light-matter interface

    E-Print Network [OSTI]

    Erhan Saglamyurek; Neil Sinclair; Joshua A. Slater; Khabat Heshami; Daniel Oblak; Wolfgang Tittel

    2014-04-24T23:59:59.000Z

    Faithful storage and coherent manipulation of quantum optical pulses are key for long distance quantum communications and quantum computing. Combining these functions in a light-matter interface that can be integrated on-chip with other photonic quantum technologies, e.g. sources of entangled photons, is an important step towards these applications. To date there have only been a few demonstrations of coherent pulse manipulation utilizing optical storage devices compatible with quantum states, and that only in atomic gas media (making integration difficult) and with limited capabilities. Here we describe how a broadband waveguide quantum memory based on the Atomic Frequency Comb (AFC) protocol can be used as a programmable processor for essentially arbitrary spectral and temporal manipulations of individual quantum optical pulses. Using weak coherent optical pulses at the few photon level, we experimentally demonstrate sequencing, time-to-frequency multiplexing and demultiplexing, splitting, interfering, temporal and spectral filtering, compressing and stretching as well as selective delaying. Our integrated light-matter interface offers high-rate, robust and easily configurable manipulation of quantum optical pulses and brings fully practical optical quantum devices one step closer to reality. Furthermore, as the AFC protocol is suitable for storage of intense light pulses, our processor may also find applications in classical communications.

  16. The High Redshift Blazar S5 0836+71: A Broadband Study

    E-Print Network [OSTI]

    Paliya, Vaidehi S

    2015-01-01T23:59:59.000Z

    A broadband study of the high redshift blazar S5 0836+71 (z = 2.172) is presented. Multi-frequency light curves show multiple episodes of X-ray and $\\gamma$-ray flares, while optical-UV fluxes show little variations. During the GeV outburst, the highest $\\gamma$-ray flux measured is (5.22 $\\pm$ 1.10) $\\times$ 10$^{-6}$ ph cm$^{-2}$ s$^{-1}$ in the range of 0.1-300 GeV, which corresponds to an isotropic $\\gamma$-ray luminosity of (1.62 $\\pm$ 0.44) $\\times$ 10$^{50}$ erg s$^{-1}$, thereby making this as one of the most luminous $\\gamma$-ray flare ever observed from any blazar. A fast $\\gamma$-ray flux rising time of $\\sim$3 hours is also noticed which is probably the first measurement of hour scale variability detected from a high redshift (z > 2) blazar. The various activity states of S5 0836+71 are reproduced under the assumption of single zone leptonic emission model. In all the states, the emission region is located inside the broad line region, and the optical-UV radiation is dominated by the accretion dis...

  17. Systematic approach of nanoparticle design to enhance the broadband plasmonic scattering effect

    SciTech Connect (OSTI)

    Byun, Soohwan; Yong Lee, Hak [Graduate School of Mechanical Engineering, Yonsei University, Seoul 120-749 (Korea, Republic of); Yoo, Jeonghoon, E-mail: yoojh@yonsei.ac.kr [School of Mechanical Engineering, Yonsei University, Seoul 120-749 (Korea, Republic of)

    2014-05-14T23:59:59.000Z

    To overcome low conversion efficiency of thin film solar cells, using the localized surface plasmon effect caused by the interaction between the incident beam and metallic nanoparticles inserted in or on the absorbing layer can be a promising alternative to overcome the low efficiency problem. Detail shape and size of nanoparticles are directly related with the localized surface plasmon effect as well as optical properties; however, their detail shape and size are hard to be determined depending only on the theoretical or experimental approach. Therefore, the method focusing on defining structural boundaries would be a useful method for nano or microscale design to generate simple and clear shape. In this study, we adopted the structural optimization scheme based on the phase field method to determine the optimal shape of a silver (Ag) nanoparticle positioned on the upper surface of the absorbing layer. We carried out the design process for broadband wavelength to be taken into account and verified the plasmonic scattering effect enhancement in the absorbing layer by numerical simulations.

  18. Subwavelength silicon through-hole arrays as an all-dielectric broadband terahertz gradient index metamaterial

    SciTech Connect (OSTI)

    Park, Sang-Gil; Jeong, Ki-Hun, E-mail: kjeong@kaist.ac.kr [Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701 (Korea, Republic of); KAIST Institute for Optical Science and Technology, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701 (Korea, Republic of); Lee, Kanghee; Han, Daehoon; Ahn, Jaewook [KAIST Institute for Optical Science and Technology, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701 (Korea, Republic of); Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701 (Korea, Republic of)

    2014-09-01T23:59:59.000Z

    Structuring at subwavelength scales brings out artificial media with anomalous optical features called metamaterials. All-dielectric metamaterials have high potential for practical applications over the whole electromagnetic spectrum owing to low loss and optical isotropy. Here, we report subwavelength silicon through-hole arrays as an all-dielectric gradient index metamaterial with broadband THz operation. The unit cell consists of a single subwavelength through-hole on highly resistive monocrystalline silicon. Depending on the fill-factor and period, the effective index was linearly modulated at 0.3–1.6 THz. The experimental results also demonstrate silicon gradient refractive index (Si-GRIN) lenses with parabolic index profiles through the spatial modification of a single unit cell along the radial direction. Si-GRIN lenses either focus 0.4–1.6 THz beam to the diffraction-limit or serve as a flat and thin solid immersion lens on the backside of THz photoconductive antenna for highly efficient pulse extraction. This all-dielectric gradient index metamaterial opens up opportunities for integrated THz GRIN optics.

  19. Development of earthquake early warning system using real time signal of broadband seismogram

    SciTech Connect (OSTI)

    Gunawan, Hendar; Puspito, Nanang T.; Ibrahim, Gunawan; Harjadi, Prih [Badan Meteorologi Klimatologi dan Geofisika, Jl. Angkasa I No 2 Jakarta 10720 Indonesia Institut Technologi Bandung, Jl. Ganesha 10, Bandung 40132 (Indonesia)

    2012-06-20T23:59:59.000Z

    Earthquake pose serious threat of live and properties for urban area near subduction zone offshore and active fault on land. Jakarta and Bandung is an example of big city that no system of Earthquake early warning (EEW) event very high urbanization, and has many important infra structure in the area. The capital city is potentially high risk ground shaking. EEW can be usefull tool for reducing earthquake hazard, if spatial relation between cities and earthquake source is favorable for such warning and their citizens are properly trained to response early warning message. An EEW and rapid response system can provide the critical information needed to minimized lost of live and property and direct rescue. Earthquake ground shaking with magnitude M>6.0 from zone of Megathrust, southern of West Java should potentially damage in the area of west java especially Bandung and Jakarta City. This research development of EEW parameter such as amplitude displacement (Pd), rapid magnitude determination (M) and Peak ground Velocity (PGV). We explore the practical approach to EEW with the use of Broadband seismogram signal. Time effective EEW which epicenter from megathrust zone has potential to provide EEW in the area of west java such as Jakarta first ground shaking more or less 60 second later and strong shaking 118 second after EEW Alarm on CISI Station. EEW notification at potentially damage in the area of west java can be predicted from the characteristic of Pd > 0.5 cm, M> 6 and PGV > 10 cm/sec. GIS as a tool for presentation of hazard mapping in the affected area.

  20. Broadband Acoustic Environment at a Tidal Energy Site in Puget Sound

    SciTech Connect (OSTI)

    Xu, Jinshan; Deng, Zhiqun; Martinez, Jayson J.; Carlson, Thomas J.; Myers, Joshua R.; Weiland, Mark A.

    2012-04-04T23:59:59.000Z

    Admiralty Inlet has been selected as a potential tidal energy site. It is located near shipping lanes, is a highly variable acoustic environment, and is frequented by the endangered southern resident killer whale (SRKW). Resolving environmental impacts is the first step to receiving approval to deploy tidal turbines. Several monitoring technologies are being considered to determine the presence of SRKW near the turbines. Broadband noise level measurements are critical for determining design and operational specifications of these technologies. Acoustic environment data at the proposed site was acquired at different depths using a cabled vertical line array from three different cruises during high tidal period in February, May, and June 2011. The ambient noise level decreases approximately 25 dB re 1 ?Pa per octave from frequency ranges of 1 kHz to 70 kHz, and increases approximately 20 dB re 1 ?Pa per octave for the frequency from 70 kHz to 200 kHz. The difference of noise pressure levels in different months varies from 10 to 30 dB re 1 ?Pa for the frequency range below 70 kHz. Commercial shipping and ferry vessel traffic were found to be the most significant contributors to sound pressure levels for the frequency range from 100 Hz to 70 kHz, and the variation could be as high as 30 dB re 1 ?Pa. These noise level measurements provide the basic information for designing and evaluating both active and passive monitoring systems proposed for deploying and operating for tidal power generation alert system.

  1. Broadband Spectral Properties of Bright High-Energy Gamma-Ray Bursts Observed with BATSE and EGRET

    E-Print Network [OSTI]

    Y. Kaneko; M. M. Gonzalez; R. Preece; B. L. Dingus; M. S. Briggs

    2008-01-12T23:59:59.000Z

    We present the spectral analysis of duration-integrated broadband spectra (in $\\sim30 $keV$-200 $MeV) of 15 bright BATSE gamma-ray bursts (GRBs). Some GRB spectra are very hard, with their spectral peak energies being above the BATSE LAD passband limit of $\\sim$2 MeV. In such cases, their high-energy spectral parameters (peak energy and high-energy power-law indices) cannot be adequately constrained by BATSE LAD data alone. A few dozen bright BATSE GRBs were also observed with EGRET's calorimeter, TASC, in multi-MeV energy band, with a large effective area and fine energy resolution. Combining the BATSE and TASC data, therefore, affords spectra that span four decades of energy ($30 $keV$-200 $MeV), allowing for a broadband spectral analysis with good statistics. Studying such broadband high-energy spectra of GRB prompt emission is crucial, as they provide key clues to understanding its gamma-ray emission mechanism. Among the 15 GRB spectra, we found two cases with a significant high-energy excess, and another case with a extremely high peak energy (\\epeak $\\gtrsim$ 170 MeV). There have been very limited number of GRBs observed at MeV energies and above, and only a few instruments have been capable of observing GRBs in this energy band with such high sensitivity. Thus, our analysis results presented here should also help predict GRB observations with current and future high-energy instruments such as AGILE and GLAST, as well as with ground-based very-high-energy telescopes.

  2. New Visible to Broadband Shortwave Conversions for Deriving Albedos from GOES-8 Over the ARM-SGP

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's Possible for Renewable Energy:Nanowire Solar541,9337, 2011RNew Visible to Broadband Shortwave

  3. The effect of continuous, broad-band random noise, both alone and in combination with a food odor on the lemon shark, Negaprion brevirostris

    E-Print Network [OSTI]

    Jones, Keith Anthony

    1977-01-01T23:59:59.000Z

    THE EFFECTS QF CONTINUOUS, BROAD-BAND RANDOM NOISE, BOTH ALONE AND IN COMBINATION WITH A FOOD ODOR ON THE LEMON SHARK, NEGAPRION BREVIROSTRIS A Thesis by KEITH ANTHOiVY JONES Submitted to the Graduate College of Texas A&M University... in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE May 1977 Major Subject: Biology THE EFFECTS OF CONTINUOUS, BROAD-BAND RANDOM NOISE BOTH ALONE AND IN COMBINATION WITH A FOOD ODOR ON THE LEMON SHARK, NEGAPRION BREVIROSTRIS A...

  4. Spectroscopic properties of Er{sup 3+} doped lead telluroborate glasses for 1.5 ?m broadband amplifiers

    SciTech Connect (OSTI)

    Vijayakumar, R., E-mail: mari-ram2000@yahoo.com; Arunkumar, S., E-mail: mari-ram2000@yahoo.com; Vijayakumar, M., E-mail: mari-ram2000@yahoo.com; Marimuthu, K., E-mail: mari-ram2000@yahoo.com [Department of Physics, Gandhigram Rural Institute ? Deemed University, Gandhigram - 624302 (India)

    2014-04-24T23:59:59.000Z

    Er{sup 3+} doped lead telluroborate glasses (xEPTB) with the composition 25B{sub 2}O{sub 3}-(25-x)TeO{sub 2}-25PbO-10Bi{sub 2}O{sub 3}-15CdO-xEr{sub 2}O{sub 3} (where x=0.1, 0.5, 1 and 2 wt%) have been prepared and characterised using NIR luminescence and decay measurements for 1.5 ?m broadband amplifier applications. Judd-Ofelt intensity parameters have been derived to predict radiative properties of the {sup 4}I{sub 13/2}?{sup 4}I{sub 15/2} emission transition. The larger values of stimulated emission cross-section (?P), FWHM, gain bandwidth (?G), radiative lifetime (?{sup cal}), quantum efficiency (?) of the 1EPTB glass suggest their potential use in broadband amplifiers. The effect of RE ion concentration and OH{sup ?} content on the lifetime of {sup 4}I{sub 13/2}?{sup 4}I{sub 15/2} transition and the energy transfer mechanism of Er{sup 3+} ions have also been discussed and reported in the present study.

  5. Ultra-broadband photon pair preparation by spontaneous four wave mixing in dispersion-engineered optical fiber

    E-Print Network [OSTI]

    Karina Garay-Palmett; Alfred B. U'Ren; Raúl Rangel-Rojo; Rodger Evans; Santiago Camacho-López

    2008-10-08T23:59:59.000Z

    We present a study of the spectral properties of photon pairs generated through the process of spontaneous four wave mixing (SFWM) in single mode fiber. Our analysis assumes narrowband pumps, which are allowed to be frequency-degenerate or non-degenerate. Based on this analysis, we derive conditions on the pump frequencies and on the fiber dispersion parameters which guarantee the generation of ultra-broadband photon pairs. Such photon pairs are characterized by: i) a very large degree of entanglement, and ii) a very high degree of temporal synchronization between the signal and idler photons. Through a numerical exercise, we find that the use of photonic crystal fiber (PCF) facilitates the fulfilment of the conditions for ultra-broadband photon pair generation; in particular, the spectral region in which emission occurs can be adjusted to particular needs through an appropriate choice of the PCF parameters. In addition, we present a novel quantum interference effect, resulting from indistinguishable pathways to the same outcome, which can occur when pumping a SFWM source with multiple spectral lines.

  6. Broadband three-photon near-infrared quantum cutting in Tm{sup 3+} singly doped YVO{sub 4}

    SciTech Connect (OSTI)

    Wang, Y. Z.; Yu, D. C.; Lin, H. H.; Ye, S.; Peng, M. Y.; Zhang, Q. Y., E-mail: qyzhang@scut.edu.cn [State Key Laboratory of Luminescence Materials and Devices, and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510641 (China)

    2013-11-28T23:59:59.000Z

    An efficient three-photon near-infrared (NIR) quantum cutting (QC) is reported in Tm{sup 3+} singly doped YVO{sub 4} polycrystalline phosphors, where an optimized content of Tm{sup 3+} is determined to be 1.0?mol. %. Upon the absorption of a visible photon around 473?nm, three NIR photons emitting at 1180, 1479, and 1800?nm can be obtained efficiently by the sequential three-step radiative transitions of Tm{sup 3+}. The underlying mechanisms are analyzed in terms of the steady and dynamic fluorescence spectra measurements. Internal quantum yield is calculated to be 161.8% as a theoretical value when luminescence quenching due to defect species can be overcome. In addition, the broadband ultraviolet (UV)-excited [VO{sub 4}]{sup 3?} can strongly sensitize the {sup 1}G{sub 4} level of Tm{sup 3+} in the wavelength range likely from 250 to 360?nm, greatly increasing the UV photo-response and NIR fluorescent intensity of Tm{sup 3+}. The further development of this broadband three-photon NIR QC material would explore the new route to improve the photo-response of novel photoelectronic devices, particularly in 250–360?nm.

  7. Preliminary Analysis of ARM SGP Area Sky Cover and Downwelling SW Irradiance

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's Possible forPortsmouth/Paducah ProjectPRE-AWARD ACCOUNTING SYSTEMMeso-ScalePPO

  8. A New Method and Results of Estimating Areal-Mean Spectral Surface Albedo from Downwelling

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of ScienceandMesa del(ANL-IN-03-032) -Less isNFebruaryOctober 2, AlgeriaQ1A Month toA NewA NewNew Method

  9. Techniques and Methods Used to Determine the Best Estimate of Total Downwelling Shortwave Radiation

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What'sis Taking Over Our InstagramStructureProposedPAGESafety Tag:8,, 20153 To.T. J. DetermineDetermine

  10. Channel Aware Unequal Error Protection for Image Transmission over Broadband Wireless LAN C. Pandana, Yan Sun, and K. J. Ray Liu

    E-Print Network [OSTI]

    Liu, K. J. Ray

    Channel Aware Unequal Error Protection for Image Transmission over Broadband Wireless LAN C proposed scheme can improve the Peak-Signal- Io-Noise-Ratio(PSNR)oireconstrurled imaxes by sip lo RIB. patterns nre introduced and the mean square channel estiinationer- ror (MSE) of diffcerentOFDM subchannels

  11. Now, more than ever, the world needs engineers. Especially in Australia, where mining and major development projects like the National Broadband Network rollout continue apace,

    E-Print Network [OSTI]

    Blennerhassett, Peter

    Architecture 36 Petroleum Engineering 37 Photovoltaics & Solar Energy Engineering 38 Renewable Energy in Australia, where mining and major development projects like the National Broadband Network rollout continue to command record salaries. But as Engineers Australia reported in August, the shortage of skilled engineers

  12. Is there a case for broadband utility communications networks? Valuing and pricing incremental communications capacity on electric utility smart grid networks

    SciTech Connect (OSTI)

    Heidell, James; Ware, Harold

    2010-01-15T23:59:59.000Z

    Analysis of the potential for selling non-utility uses of broadband capability constructed in conjunction with Smart Grid/AMI deserves careful consideration. These services can be provided in a manner that neither creates unfair competition nor results in cross-subsidization of unregulated services by regulated services. (author)

  13. Ultrathin Ultra-broadband Electro-Absorption Modulator based on Few-layer Graphene based Anisotropic Metamaterial

    E-Print Network [OSTI]

    Sayem, Ayed Al; Jahangir, Ifat; Rahman, Md Saifur

    2015-01-01T23:59:59.000Z

    In this article, a few-layered graphene-dielectric multilayer (metamaterial) electro-optic modulator has been proposed in the mid and far infrared range that works on electro-absorption mechanism. Graphene, both mono layer and few layer, is an actively tunable optical material that allows control of inter-band and intra-band transition by tuning its chemical potential. Utilizing this unique feature of graphene, we propose a multilayer graphene dielectric stack where few layer graphene is preferred over mono layer graphene. Although the total thickness of the stack still remains in the nanometer range, this device can exhibit superior performances in terms of (i) high modulation depth, (ii) ultra-broadband performance, (iii) ultra-low insertion loss due to inherent metamaterial properties, (iv) nanoscale footprint, (v) polarization independence and (vi) capability of being integrated to a silicon waveguide. Interestingly, these superior performances, achievable by using few layer graphene with carefully design...

  14. Ultra-compact and broadband tunable mid-infrared multimode interference splitter based on graphene plasmonic waveguide

    E-Print Network [OSTI]

    Zheng, Ruiqi; Dong, Jianji

    2015-01-01T23:59:59.000Z

    We propose and design an ultra-compact and broadband tunable multimode interference (MMI) splitter in mid-infrared based on graphene plasmonic waveguides. The size of the device is only 0.56{\\mu}m*1.2{\\mu}m, which corresponds to device area of only about 0.014{\\lambda}^2, where {\\lambda} is the vacuum wavelength. And the center wavelength of the device can be tuned in a broad band from 7{\\mu}m to 9{\\mu}m with the Fermi level of graphene varied from 0.5eV to 1eV. Furthermore, the device is easy to be fabricated on chip.

  15. High-performance broadband optical coatings on InGaN/GaN solar cells for multijunction device integration

    SciTech Connect (OSTI)

    Young, N. G., E-mail: ngyoung@engineering.ucsb.edu; Farrell, R. M.; Iza, M.; Speck, J. S. [Materials Department, University of California, Santa Barbara, California 93106 (United States); Perl, E. E.; Keller, S. [Department of Electrical and Computer Engineering, University of California, Santa Barbara, California 93106 (United States); Bowers, J. E.; Nakamura, S.; DenBaars, S. P. [Materials Department, University of California, Santa Barbara, California 93106 (United States); Department of Electrical and Computer Engineering, University of California, Santa Barbara, California 93106 (United States)

    2014-04-21T23:59:59.000Z

    We demonstrate InGaN/GaN multiple quantum well solar cells grown by metalorganic chemical vapor deposition on a bulk (0001) substrate with high-performance broadband optical coatings to improve light absorption. A front-side anti-reflective coating and a back-side dichroic mirror were designed to minimize front surface reflections across a broad spectral range and maximize rear surface reflections only in the spectral range absorbed by the InGaN, making the cells suitable for multijunction solar cell integration. Application of optical coatings increased the peak external quantum efficiency by 56% (relative) and conversion efficiency by 37.5% (relative) under 1 sun AM0 equivalent illumination.

  16. Quantitative broadband absorption and scattering spectroscopy in turbid media by combined frequency-domain and steady state methodologies

    DOE Patents [OSTI]

    Tromberg, Bruce J. (Irvine, CA); Berger, Andrew J. (Rochester, NY); Cerussi, Albert E. (Lake Forest, CA); Bevilacqua, Frederic (Costa Mesa, CA); Jakubowski, Dorota (Irvine, CA)

    2008-09-23T23:59:59.000Z

    A technique for measuring broadband near-infrared absorption spectra of turbid media that uses a combination of frequency-domain and steady-state reflectance methods. Most of the wavelength coverage is provided by a white-light steady-state measurement, whereas the frequency-domain data are acquired at a few selected wavelengths. Coefficients of absorption and reduced scattering derived from the frequency-domain data are used to calibrate the intensity of the steady-state measurements and to determine the reduced scattering coefficient at all wavelengths in the spectral window of interest. The absorption coefficient spectrum is determined by comparing the steady-state reflectance values with the predictions of diffusion theory, wavelength by wavelength. Absorption spectra of a turbid phantom and of human breast tissue in vivo, derived with the combined frequency-domain and steady-state technique, agree well with expected reference values.

  17. CONTAMINATION OF BROADBAND PHOTOMETRY BY NEBULAR EMISSION IN HIGH-REDSHIFT GALAXIES: INVESTIGATIONS WITH KECK'S MOSFIRE NEAR-INFRARED SPECTROGRAPH

    SciTech Connect (OSTI)

    Schenker, Matthew A; Ellis, Richard S; Konidaris, Nick P [Department of Astrophysics, California Institute of Technology, MC 249-17, Pasadena, CA 91125 (United States); Stark, Daniel P, E-mail: schenker@astro.caltech.edu [Department of Astronomy and Steward Observatory, University of Arizona, Tucson, AZ 85721 (United States)

    2013-11-01T23:59:59.000Z

    Earlier work has raised the potential importance of nebular emission in the derivation of the physical characteristics of high-redshift Lyman break galaxies. Within certain redshift ranges, and especially at z ? 6-7, such lines may be strong enough to reduce estimates of the stellar masses and ages of galaxies compared with those derived assuming the broadband photometry represents stellar light alone. To test this hypothesis at the highest redshifts where such lines can be probed with ground-based facilities, we examine the near-infrared spectra of a representative sample of 28 3.0 < z < 3.8 Lyman break galaxies using the newly commissioned MOSFIRE near-infrared spectrograph at the Keck I telescope. We use these data to derive the rest-frame equivalent widths (EWs) of [O III] emission and show that these are comparable with estimates derived using the spectral energy distribution (SED) fitting technique introduced for sources of known redshift by Stark et al. Although our current sample is modest, its [O III] EW distribution is consistent with that inferred for H? based on SED fitting of Stark et al.'s larger sample of 3.8 < z < 5 galaxies. For a subset of survey galaxies, we use the combination of optical and near-infrared spectroscopy to quantify kinematics of outflows in z ? 3.5 star-forming galaxies and discuss the implications for reionization measurements. The trends we uncover underline the dangers of relying purely on broadband photometry to estimate the physical properties of high-redshift galaxies and emphasize the important role of diagnostic spectroscopy.

  18. Ground motion modeling of Hayward fault scenario earthquakes II:Simulation of long-period and broadband ground motions

    SciTech Connect (OSTI)

    Aagaard, B T; Graves, R W; Rodgers, A; Brocher, T M; Simpson, R W; Dreger, D; Petersson, N A; Larsen, S C; Ma, S; Jachens, R C

    2009-11-04T23:59:59.000Z

    We simulate long-period (T > 1.0-2.0 s) and broadband (T > 0.1 s) ground motions for 39 scenarios earthquakes (Mw 6.7-7.2) involving the Hayward, Calaveras, and Rodgers Creek faults. For rupture on the Hayward fault we consider the effects of creep on coseismic slip using two different approaches, both of which reduce the ground motions compared with neglecting the influence of creep. Nevertheless, the scenario earthquakes generate strong shaking throughout the San Francisco Bay area with about 50% of the urban area experiencing MMI VII or greater for the magnitude 7.0 scenario events. Long-period simulations of the 2007 Mw 4.18 Oakland and 2007 Mw 4.5 Alum Rock earthquakes show that the USGS Bay Area Velocity Model version 08.3.0 permits simulation of the amplitude and duration of shaking throughout the San Francisco Bay area, with the greatest accuracy in the Santa Clara Valley (San Jose area). The ground motions exhibit a strong sensitivity to the rupture length (or magnitude), hypocenter (or rupture directivity), and slip distribution. The ground motions display a much weaker sensitivity to the rise time and rupture speed. Peak velocities, peak accelerations, and spectral accelerations from the synthetic broadband ground motions are, on average, slightly higher than the Next Generation Attenuation (NGA) ground-motion prediction equations. We attribute at least some of this difference to the relatively narrow width of the Hayward fault ruptures. The simulations suggest that the Spudich and Chiou (2008) directivity corrections to the NGA relations could be improved by including a dependence on the rupture speed and increasing the areal extent of rupture directivity with period. The simulations also indicate that the NGA relations may under-predict amplification in shallow sedimentary basins.

  19. Effects of macroscopic propagation on spectra of broadband supercontinuum harmonics and isolated-attosecond-pulse generation: Coherent control of the electron quantum trajectories in two-color laser fields

    E-Print Network [OSTI]

    Chu, Shih-I; Li, Peng-Cheng

    2012-07-13T23:59:59.000Z

    Recently it was shown that broadband supercontinuum harmonics can be produced from the long-trajectory electrons in the single-atom response by the coherent control of the electron trajectories through optimized two-color ...

  20. Long-wave models of thin film fluid dynamics

    E-Print Network [OSTI]

    A. J. Roberts

    1994-11-04T23:59:59.000Z

    Centre manifold techniques are used to derive rationally a description of the dynamics of thin films of fluid. The derived model is based on the free-surface $\\eta(x,t)$ and the vertically averaged horizontal velocity $\\avu(x,t)$. The approach appears to converge well and has significant differences from conventional depth-averaged models.

  1. A comparison of cloudiness measures derived from longwave measurements and

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of ScienceandMesa del(ANL-IN-03-032) -Less isNFebruaryOctober 2,

  2. Broadband spectroscopy of the eclipsing high mass X-ray binary 4U 1700-37 with Suzaku

    E-Print Network [OSTI]

    Jaisawal, Gaurava K

    2015-01-01T23:59:59.000Z

    We present the results obtained from broadband spectroscopy of the high mass X-ray binary 4U 1700-37 using data from a Suzaku observation in 2006 September 13-14 covering 0.29-0.72 orbital phase range. The light curves showed significant and rapid variation in source flux during entire observation. We did not find any signature of pulsations in the light curves. However, a quasi-periodic oscillation at ~20 mHz was detected in the power density spectrum of the source. The 1-70 keV spectrum was fitted with various continuum models. However, we found that the partially absorbed high energy cutoff power-law and Negative and Positive power-law with Exponential cutoff (NPEX) models described the source spectrum well. Iron emission lines at 6.4 keV and 7.1 keV were detected in the source spectrum. An absorption like feature at ~39 keV was detected in the residuals while fitting the data with NPEX model. Considering the feature as cyclotron absorption line, the surface magnetic field of the neutron star was estimated...

  3. Broadband energy-efficient optical modulation by hybrid integration of silicon nanophotonics and organic electro-optic polymer

    E-Print Network [OSTI]

    Zhang, Xingyu; Subbaraman, Harish; Luo, Jingdong; Jen, Alex K -Y; Chung, Chi-jui; Yan, Hai; Pan, Zeyu; Nelson, Robert L; Chen, Ray T

    2015-01-01T23:59:59.000Z

    Silicon-organic hybrid integrated devices have emerging applications ranging from high-speed optical interconnects to photonic electromagnetic-field sensors. Silicon slot photonic crystal waveguides (PCWs) filled with electro-optic (EO) polymers combine the slow-light effect in PCWs with the high polarizability of EO polymers, which promises the realization of high-performance optical modulators. In this paper, a broadband, power-efficient, low-dispersion, and compact optical modulator based on an EO polymer filled silicon slot PCW is presented. A small voltage-length product of V{\\pi}*L=0.282Vmm is achieved, corresponding to an unprecedented record-high effective in-device EO coefficient (r33) of 1230pm/V. Assisted by a backside gate voltage, the modulation response up to 50GHz is observed, with a 3-dB bandwidth of 15GHz, and the estimated energy consumption is 94.4fJ/bit at 10Gbit/s. Furthermore, lattice-shifted PCWs are utilized to enhance the optical bandwidth by a factor of ~10X over other modulators bas...

  4. Broadband X-ray Imaging and Spectroscopy of the Crab Nebula and Pulsar with NuSTAR

    E-Print Network [OSTI]

    Madsen, Kristin K; Harrison, Fiona; An, Hongjun; Boggs, Steven; Christensen, Finn E; Craig, William W; Fryer, Chris L; Grefenstette, Brian W; Hailey, Charles J; Markwardt, Craig; Nynka, Melania; Stern, Daniel; Zoglauer, Andreas; Zhang, William

    2015-01-01T23:59:59.000Z

    We present broadband (3 -- 78 keV) NuSTAR X-ray imaging and spectroscopy of the Crab nebula and pulsar. We show that while the phase-averaged and spatially integrated nebula + pulsar spectrum is a power-law in this energy band, spatially resolved spectroscopy of the nebula finds a break at $\\sim$9 keV in the spectral photon index of the torus structure with a steepening characterized by $\\Delta\\Gamma\\sim0.25$. We also confirm a previously reported steepening in the pulsed spectrum, and quantify it with a broken power-law with break energy at $\\sim$12 keV and $\\Delta\\Gamma\\sim0.27$. We present spectral maps of the inner 100\\as\\ of the remnant and measure the size of the nebula as a function of energy in seven bands. These results find that the rate of shrinkage with energy of the torus size can be fitted by a power-law with an index of $\\gamma = 0.094\\pm 0.018$, consistent with the predictions of Kennel and Coroniti (1984). The change in size is more rapid in the NW direction, coinciding with the counter-jet w...

  5. Connection between inner jet kinematics and broadband flux variability in the BL Lac object S5 0716+714

    E-Print Network [OSTI]

    Rani, B; Marscher, A P; Hodgson, J A; Fuhrmann, L; Angelakis, E; Britzen, S; Zensus, J A

    2015-01-01T23:59:59.000Z

    We present a high-frequency very long baseline interferometry (VLBI) kinematical study of the BL Lac object S5 0716+714 over the time period of September 2008 to October 2010. The aim of the study is to investigate the relation of the jet kinematics to the observed broadband flux variability. We find significant non-radial motions in the jet outflow of the source. In the radial direction, the highest measured apparent speed is \\sim37 c, which is exceptionally high, especially for a BL Lac object. Patterns in the jet flow reveal a roughly stationary feature \\sim0.15 mas downstream of the core. The long-term fits to the component trajectories reveal acceleration in the sub-mas region of the jet. The measured brightness temperature, T_{B}, follows a continuous trend of decline with distance, T_B \\propto r_{jet}^{-(2.36\\pm0.41)}, which suggests a gradient in Doppler factor along the jet axis. Our analysis suggest that a moving disturbance (or a shock wave) from the base of the jet produces the high-energy (optica...

  6. Comment on “Competition between coherent emission and broadband spontaneous emission in the quantum free electron laser” [Phys. Plasmas 20, 033106 (2013)

    SciTech Connect (OSTI)

    Petrillo, V.; Rossi, A. R.; Serafini, L. [Università di Milano-INFN, Via Celoria, 16 Milano (Italy)] [Università di Milano-INFN, Via Celoria, 16 Milano (Italy)

    2013-12-15T23:59:59.000Z

    We point out that in the equation for the electron distribution evolution during Thomson/Compton or undulator radiation used in the paper: “Competition between coherent emission and broadband spontaneous emission in the quantum free electron laser” by G. R. M. Robb and R. Bonifacio [Phys. Plasmas 20, 033106 (2013)], the weight function should be the distribution of the number of emitted photons and not the photon energy distribution. Nevertheless, the considerations expressed in this comment do not alter the conclusions drawn in the paper in object.

  7. BROADBAND TIME-RESOLVED E{sub p,i}-L{sub iso} CORRELATION IN GAMMA-RAY BURSTS

    SciTech Connect (OSTI)

    Frontera, F.; Guidorzi, C. [Dipartimento di Fisica, Universita di Ferrara, Via Saragat 1, I-44100 Ferrara (Italy); Amati, L.; Landi, R. [INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna, Via Gobetti 101, I-40129 Bologna (Italy); In't Zand, J., E-mail: frontera@fe.infn.it [Space Research Organization in the Netherlands, Sorbonnelaan 2, NL-3584 CA Utrecht (Netherlands)

    2012-08-01T23:59:59.000Z

    We report the results of a systematic study of the broadband (2-2000 keV) time-resolved prompt emission spectra of a sample of gamma-ray bursts (GRBs) detected with both Wide Field Cameras on board the BeppoSAX satellite and the BATSE experiment on board CGRO. In this first paper, we study the time-resolved dependence of the intrinsic peak energy E{sub p,i} of the E F(E) spectrum on the corresponding isotropic bolometric luminosity L{sub iso}. The E{sub p,i}-L{sub iso} relation or the equivalent relation between E{sub p,i} and the bolometric released energy E{sub iso}, derived using the time-averaged spectra of long GRBs with known redshift, is well established, but its physical origin is still a subject of discussion. In addition, some authors maintain that these relations are the result of instrumental selection effects. We find that not only a relation between the measured peak energy E{sub p} and the corresponding energy flux, but also a strong E{sub p,i} versus L{sub iso} correlation are found not only within each burst, but also are merging together the time-resolved data points from different GRBs. We do not expect significant instrumental selection effects that can affect the results obtained, apart from the fact that the GRBs in our sample are sufficiently bright to perform a time-resolved spectroscopy and that they have known redshift. If the fundamental physical process that gives rise to the GRB phenomenon does not depend on its brightness, we conclude that the E{sub p,i} versus L{sub iso} correlation found within each GRB is intrinsic to the emission process and that the correlations discovered by Amati et al. and Yonetoku et al. are likely not the result of selection effects. We also discuss the properties of the correlations found.

  8. The effect of broad-band Alfven-cyclotron waves spectra on the preferential heating and differential acceleration of He{sup ++} ions in the solar wind

    SciTech Connect (OSTI)

    Maneva, Y. G. [Department of Physics, Catholic University of America, Washington DC, 20064 (United States) and Heliophysics Science Devision, NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States); Ofman, L. [Department of Physics, Catholic University of America, Washington, DC 20064 (United States) and Heliophysics Science Devision, NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States); Vinas, A. F. [Heliophysics Science Devision, NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)

    2013-06-13T23:59:59.000Z

    In anticipation of results from inner heliospheric missions such as the Solar Orbiter and the Solar Probe we present the results from 1.5D hybrid simulations to study the role of magnetic fluctuations for the heating and differential acceleration of He{sup ++} ions in the solar wind. We consider the effects of nonlinear Alfven-cyclotron waves at different frequency regimes. Monochromatic nonlinear Alfven-alpha-cyclotron waves are known to preferentially heat and accelerate He{sup ++} ions in collisionless low beta plasma. In this study we demonstrate that these effects are preserved when higherfrequency monochromatic and broad-band spectra of Alfven-proton-cyclotron waves are considered. Comparison between several nonlinear monochromatic waves shows that the ion temperatures, anisotropies and relative drift are quantitatively affected by the shift in frequency. Including a broad-band wave-spectrum results in a significant reduction of both the parallel and the perpendicular temperature components for the He{sup ++} ions, whereas the proton heating is barely influenced, with the parallel proton temperature only slightly enhanced. The differential streaming is strongly affected by the available wave power in the resonant daughter ion-acoustic waves. Therefore for the same initial wave energy, the relative drift is significantly reduced in the case of initial wave-spectra in comparison to the simulations with monochromatic waves.

  9. Broadband terahertz photonics

    E-Print Network [OSTI]

    Burghoff, David Patrick

    2014-01-01T23:59:59.000Z

    In recent years, quantum cascade lasers have emerged as mature semiconductor sources of light in the terahertz range, the frequency range spanning 1 to 10 THz. Though technological development has pushed their operating ...

  10. Optical Broadband Angular Selectivity

    E-Print Network [OSTI]

    Shen, Yichen

    Light selection based purely on the angle of propagation is a long-standing scientific challenge. In angularly selective systems, however, the transmission of light usually also depends on the light frequency. We tailored ...

  11. Bulletin of the Seismological Society of America, Vol. 95, No. 3, pp. 12021208, June 2005, doi: 10.1785/0120040098 Broadband Seismic Noise Analysis of the Himalayan Nepal Tibet

    E-Print Network [OSTI]

    Sheehan, Anne F.

    , doi: 10.1785/0120040098 Broadband Seismic Noise Analysis of the Himalayan Nepal Tibet Seismic at sites to stabilize after deployment noise as part of the Himalayan Nepal Tibet Seismic Experiment (HIMNT seismometer deployed in Nepal and Tibet and then compared them with the high-noise model and low-noise Model

  12. Definitions of Clear-sky Fluxes and Implications

    E-Print Network [OSTI]

    Verma, Abhishek

    2012-02-14T23:59:59.000Z

    in radiances at various wavelengths to- wards or away from the earth system. Various studies have estimated the distribu- tion of these uxes at top-of-atmosphere (TOA), over land, ocean and ice-covered surfaces, in both upwelling and downwelling direction... (shortwave and longwave) are constructed using radiances that aren?t attenuated by cloud hydrometeors and are used in determining CRFs. By far, clear-sky uxes are derived using two approaches based on (i) satellite measurements and (ii) model generated...

  13. Asymmetry in the Diurnal Cycle of Atmospheric Downwelling Radiation at the ARM SGP CF Site Over 1995-2001 Period

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office511041cloth DocumentationProductsAlternativeOperational ManagementDemand Module This AssuranceAsymmetry in

  14. Investigation of the validity of quasilinear theory for electron Landau damping in a tokamak using a broad-band wave effect

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

    Lee, Jungpyo; Bonoli, Paul; Wright, John

    2011-01-14T23:59:59.000Z

    The quasilinear diffusion coefficient assuming a constant magnetic field along the electron orbit is widely used to describe electron Landau damping of waves in a tokamak where the magnitude of the magnetic field varies on a flux surface. To understand the impact of violating the constant magnetic field assumption, we introduce the effect of a broad-bandwidth wave spectrum which has been used in the past to validate quasilinear theory for the fast decorrelation process between resonances. By the reevaluation of the diffusion coefficient through the level of the phase integral for the tokamak geometry with the broad-band wave effect included, we identify the three acceptable errors for the use of the quasilinear diffusion coefficient.

  15. Investigation of the validity of quasilinear theory for electron Landau damping in a tokamak using a broad-band wave effect

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

    Lee, Jungpyo; Bonoli, Paul; Wright, John

    2011-01-14T23:59:59.000Z

    The quasilinear diffusion coefficient assuming a constant magnetic field along the electron orbit is widely used to describe electron Landau damping of waves in a tokamak where the magnitude of the magnetic field varies on a flux surface. To understand the impact of violating the constant magnetic field assumption, we introduce the effect of a broad-bandwidth wave spectrum which has been used in the past to validate quasilinear theory for the fast decorrelation process between resonances. By the reevaluation of the diffusion coefficient through the level of the phase integral for the tokamak geometry with the broad-band wave effect included,more »we identify the three acceptable errors for the use of the quasilinear diffusion coefficient.« less

  16. Broadband absorption enhancement in ultra-thin crystalline Si solar cells by incorporating metallic and dielectric nanostructures in the back reflector

    E-Print Network [OSTI]

    Jain, Samart; Miljkovic, Vladimir D; Dmitriev, Alexamder; Trompoukis, Christos; Gordon, Ivan; van Dorpe, Pol; Daif, Ounsi El

    2013-01-01T23:59:59.000Z

    We propose a back-reflecting scheme in order to enhance the maximum achievable current in one micron thick crystalline silicon solar cells. We perform 3-dimensional numerical investigations of the scattering properties of metallic nanostructures located at the back side, and optimize them for enhancing absorption in the silicon layer. We validate our numerical results experimentally and also compare the absorption enhancement in the solar cell structure, both with quasi-periodic and random metallic nanostructures. We have looked at the interplay between the metallic nanostructures and an integrated back-reflector. We show that the combination of metallic nanoparticles and a metallic reflector results in significant parasitic absorption. We compared this to another implementation based on titanium dioxide nanoparticles which act as a lambertian reflector of light. Our simulation and experimental results show that this proposed configuration results in reduced absorption losses and in broadband enhancement of a...

  17. Near-infrared and optical broadband surface photometry of 86 face-on disk dominated galaxies. IV. Using color profiles to study stellar and dust content of galaxies

    E-Print Network [OSTI]

    Roelof S. de Jong

    1996-04-02T23:59:59.000Z

    The stellar and dust content of spiral galaxies as function of radius has been investigated using near-infrared and optical broadband surface photometry of 86 face-on spiral galaxies. Colors of galaxies correlate with the azimuthally averaged local surface brightness both within and among galaxies, with the lower surface brightness regions being bluer. The colors formed from different passband combinations correlate strongly indicating that they probably arise from the same physical process. A 3D radiative transfer model was developed to calculate the effect of dust absorption and scattering on the luminosity and color profiles of galaxies. Stellar synthesis models were used to investigate the effects of the star formation history and the metallicity on the broadband color profiles. Combining all optical and near-infrared data shows that the color gradients in this sample of face-on galaxies are best explained by a combined stellar age and metallicity gradient across the disk, with the outer regions being on average younger and of lower metallicity. Dust reddening probably plays only a minor role, as the dust models cannot produce reddening profiles that are compatible with the observations. The observed color differences implicate substantial M/L_lambda differences, both within galaxies and among galaxies. The variations are such that the ``missing light'' problem derived from rotation fitting becomes even worse. Late-type galaxies (T>=6) have lower metallicities and are often of younger average age than earlier types and have therefore an entirely different M/L_\\lambda in most passbands. The near-infrared passbands are recommended for studies where the M/L_\\lambda ratios should not vary too much.

  18. Ultra-broadband terahertz time-domain ellipsometric spectroscopy utilizing GaP and GaSe emitters and an epitaxial layer transferred photoconductive detector

    SciTech Connect (OSTI)

    Yamashita, Masatsugu, E-mail: m-yama@riken.jp; Takahashi, Hideki; Otani, Chiko [RIKEN Center for Advanced Photonics, 519-1399 Aobaaramaki, Aoba-ku, Sendai 980-0845 (Japan); Ouchi, Toshihiko [Corporate R and D Headquarters, Canon Inc., 30-2 Shimomaruko 3-Chome, Ohta-ku, Tokyo 145-8501 (Japan)

    2014-02-03T23:59:59.000Z

    We present a reflection-type ultra-broadband terahertz (THz) time-domain spectroscopic ellipsometry system covering the frequency range of 0.5–30 THz. GaP (110) and z-cut GaSe crystals are used as emitters to generate the THz and mid-infrared pulses, respectively, and a photoconductive antenna switch using a low-temperature grown GaAs epitaxial layer transferred on Si substrate was used as a detector. By changing the emitter between the GaP and GaSe crystals, the measurable frequency range can be easily switched from the 0.5–7.8 THz range to the 7.8–30 THz range without additional optical alignment. We demonstrated the measurement of the dielectric function in a p-type InAs wafer and the optical conductivity of an indium tin oxide (ITO) thin film. The obtained carrier density and the mobility of the ITO thin film show good agreement with that obtained by the Hall measurement.

  19. Testing the inverse-Compton catastrophe scenario in the intra-day variable blazar S5 0716+71. I. Simultaneous broadband observations during November 2003

    E-Print Network [OSTI]

    L. Ostorero; S. J. Wagner; J. Gracia; E. Ferrero; T. P. Krichbaum; S. Britzen; A. Witzel; K. Nilsson; M. Villata

    2006-02-10T23:59:59.000Z

    Some intra-day variable, compact extra-galactic radio sources show brightness temperatures severely exceeding 10^{12} K, the limit set by catastrophic inverse-Compton (IC) cooling in sources of incoherent synchrotron radiation. The violation of the IC limit, possible under non-stationary conditions, would lead to IC avalanches in the soft-gamma-ray energy band during transient periods. For the first time, broadband signatures of possible IC catastrophes were searched for in S5 0716+71. A multifrequency observing campaign targetting S5 0716+71 was carried out in November 2003 under the framework of the European Network for the Investigation of Galactic nuclei through Multifrequency Analysis (ENIGMA) together with a campaign by the Whole Earth Blazar Telescope (WEBT), involving a pointing by the soft-gamma-ray satellite INTEGRAL, optical, near-infrared, sub-millimeter, millimeter, radio, and Very Long Baseline Array (VLBA) monitoring. S5 0716+71 was very bright at radio frequencies and in a rather faint optical state during the INTEGRAL pointing; significant inter-day and low intra-day variability was recorded in the radio regime, while typical fast variability features were observed in the optical band. No correlation was found between the radio and optical emission. The source was not detected by INTEGRAL, neither by the X-ray monitor JEM-X nor by the gamma-ray imager ISGRI, but upper limits to the source emission in the 3-200 keV energy band were estimated. A brightness temperature Tb>2.1x10^{14} K was inferred from the radio variability, but no corresponding signatures of IC avalanches were recorded at higher energies. The absence of IC-catastrophe signatures provides either a lower limit delta>8 to the Doppler factor affecting the radio emission or strong constraints for modelling of the Compton catastrophes in S5 0716+71.

  20. ARM - Measurement - Shortwave broadband radiance

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadap Documentation TDMADAP : XDCnarrowband upwellingpolarization ARMdownwelling

  1. NSA Broadband Instrument Study: Update

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's Possible for Renewable Energy: GridTruck Platooning TestingSupplier List KitFaridpur

  2. Hollow Core Fiber Optics for Mid-Wave and Long-Wave Infrared Spectroscopy

    E-Print Network [OSTI]

    angle cleaving or anti- reflection coatings to minimize laser feedback effects, and effectively transmit deeper into the infrared. This paper focuses on recent developments in hollow fiber technology geared

  3. Longwave radiative forcing of Saharan dust aerosols estimated from MODIS, MISR, and CERES observations on Terra

    E-Print Network [OSTI]

    Christopher, Sundar A.

    observations from the Advanced Very High Resolution Radiometer (AVHRR) [Ackerman and Chung, 1992] and the Total's Radiant Energy System (CERES) instruments onboard the Terra satellite; we present a new technique prevalent in the tropics [Prospero, 1999], dust aerosols are effective in reflecting solar energy back

  4. Long-Wave Infrared At Coso Geothermal Area (1968-1971) | Open Energy

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere I Geothermal Pwer Plant Jump to:Landowners andLodgepole, Nebraska: EnergyLomita,CapitalInformation

  5. Posters Monte Carlo Simulation of Longwave Fluxes Through Broken Scattering Cloud Fields

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's Possible forPortsmouth/Paducah Project Office PressPostdoctoraldecadal observations7197 Posters75

  6. Large Eddy Simulation of PBL Stratocumulus: Comparison of Multi-Dimensional and IPA Longwave Radiative Forcing

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHigh SchoolIn12electron 9 5 - -/e),,sand CERNLand and

  7. Clear Skies A Study of Longwave Radiation Codes for Climate Studies: Validation with Observations

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office511041clothAdvanced Materials Advanced. C o w l i t zManufacturing: U.S. Competitiveness2 PA. A. lacisA

  8. Multi-Dimensional Effects in Longwave Radiative Forcing of PBL Clouds

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOEThe Bonneville PowerCherries 82981-1cnHighandSWPA / SPRA /Ml'.SolarUS Dept ofActing Chiefof Inks and Toners | The

  9. A 22-Year Dataset of Surface Longwave Fluxes in the Arctic

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of ScienceandMesa del(ANL-IN-03-032) -Less isNFebruaryOctober 2, AlgeriaQ1 Q2 Q3 Ut NOTICE20-Year

  10. Technical Sessions A Study of Longwave Radiation Codes for Climate Studies:

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What'sis Taking Over Our InstagramStructureProposedPAGESafety Tag:8,, 20153 To.T. J. Kulp J.A Study of

  11. A Cloud Detection Algorithm using the Downwelling Infrared Radiance Measured by an Infrared Pyrometer of the Ground-based Microwave Radiometer

    SciTech Connect (OSTI)

    Ahn, M. H.; Han, D.; Won, H. Y.; Morris, Victor R.

    2015-01-01T23:59:59.000Z

    For a better utilization of the ground-based microwave radiometer, it is important to detect the cloud presence in the measured data. Here, we introduce a simple and fast cloud detection algorithm by using the optical characteristics of the clouds in the infrared atmospheric window region. The new algorithm utilizes the brightness temperature (Tb) measured by an infrared radiometer installed on top of a microwave radiometer. The two step algorithm consists of a spectral test followed by a temporal test. The measured Tb is first compared with a predicted clear sky Tb obtained by an empirical formula as a function of surface air temperature and water vapor pressure. For the temporal test, the temporal variability of the measured Tb during one minute compares with a dynamic threshold value, representing the variability of the clear sky condition. It is designated as cloud free data only when both the spectral and temporal tests confirm a cloud free data. Overall, most of the thick and uniform clouds are successfully screened out by the spectral test, while the broken and fast-varying clouds are screened out by the temporal test. The algorithm is validated by comparison with the collocated ceilometer data for 6 months, from January 2013 to June 2013. The overall proportion correct is about 88.3% and the probability of detection is 90.8 %, which are comparable with or better than those of previous similar approaches. Two thirds of failures occur when the new algorithm detects clouds while the ceilometer does not detect, resulting in different values of the probability of detection with different cloud base altitude, 93.8, 90.3, and 82.8% for low, mid, and high clouds, respectively. Finally, due to the characteristics of the spectral range, the new algorithm is found to be insensitive to the presence of inversion layers.

  12. A cloud detection algorithm using the downwelling infrared radiance measured by an infrared pyrometer of the ground-based microwave radiometer

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

    Ahn, M.-H.; Han, D.; Won, H. Y.; Morris, V.

    2015-01-01T23:59:59.000Z

    For better utilization of the ground-based microwave radiometer, it is important to detect the cloud presence in the measured data. Here, we introduce a simple and fast cloud detection algorithm by using the optical characteristics of the clouds in the infrared atmospheric window region. The new algorithm utilizes the brightness temperature (Tb) measured by an infrared radiometer installed on top of a microwave radiometer. The two-step algorithm consists of a spectral test followed by a temporal test. The measured Tb is first compared with a predicted clear-sky Tb obtained by an empirical formula as a function of surface air temperaturemore »and water vapor pressure. For the temporal test, the temporal variability of the measured Tb during one minute compares with a dynamic threshold value, representing the variability of clear-sky conditions. It is designated as cloud-free data only when both the spectral and temporal tests confirm cloud-free data. Overall, most of the thick and uniform clouds are successfully detected by the spectral test, while the broken and fast-varying clouds are detected by the temporal test. The algorithm is validated by comparison with the collocated ceilometer data for six months, from January to June 2013. The overall proportion of correctness is about 88.3% and the probability of detection is 90.8%, which are comparable with or better than those of previous similar approaches. Two thirds of discrepancies occur when the new algorithm detects clouds while the ceilometer does not, resulting in different values of the probability of detection with different cloud-base altitude, 93.8, 90.3, and 82.8% for low, mid, and high clouds, respectively. Finally, due to the characteristics of the spectral range, the new algorithm is found to be insensitive to the presence of inversion layers.« less

  13. Convective Signals from Surface Measurements at ARM Tropical Western Pacific Site: Manus

    SciTech Connect (OSTI)

    Wang, Yi; Long, Charles N.; Mather, James H.; Liu, Xiaodong

    2011-02-23T23:59:59.000Z

    The Madden-Julian Oscillation (MJO) signal has been detected using observations from the Department of Energy (DOE) Atmospheric Radiation Measurement (ARM) Climate Research Facility (ACRF) Tropical Western Pacific (TWP). With downwelling shortwave radiative fluxes and fractional sky cover from the ACRF TWP Manus site, and the statistical tools of wavelet and spectrum power, we report finding major convective signals from surface observations spanning the period from 1996 to 2006. Our findings are confirmed with the satellite-retrieved values of precipitation from the Global Precipitation Climatology Project (GPCP), and interpolated outgoing longwave radiation (OLR) satellite measurements from the National Oceanic and Atmospheric Administration (NOAA) for the same location. Our results indicate that the MJO convective signal has a strong seasonal-to-interannual evolution that is likely correlated with the interannual variability of El Ni ˜no Southern Oscillation (ENSO).

  14. Overview of observations from the RADAGAST experiment in Niamey, Niger. Part 2: Radiative fluxes and divergences

    SciTech Connect (OSTI)

    Slingo, A.; White, H. E.; Bharmal, N.; Robinson, G. J.

    2009-02-25T23:59:59.000Z

    Broadband shortwave and longwave radiative fluxes observed both at the surface and from space during the RADAGAST experiment in Niamey, Niger in 2006 are presented. The surface fluxes were measured by the Atmospheric Radiation Measurement (ARM) Program Mobile Facility (AMF) at Niamey airport, while the fluxes at the top of the atmosphere (TOA) are from the Geostationary Earth Radiation Budget (GERB) instrument on the Meteosat-8 satellite. The data are analyzed as daily averages, in order to minimise sampling differences between the surface and top of atmosphere instruments, while retaining the synoptic and seasonal changes that are the main focus of this study. A cloud mask is used to identify days with cloud from those with predominantly clear skies. The influence of temperature, water vapor, aerosols and clouds is investigated. Aerosols are ubiquitous throughout the year and have a significant impact on both the shortwave and longwave fluxes. The large and systematic seasonal changes in temperature and column integrated water vapor (CWV) through the dry and wet seasons are found to exert strong influences on the longwave fluxes. These influences are often in opposition to each other, because the highest temperatures occur at the end of the dry season when the CWV is lowest, while in the wet season the lowest temperatures are associated with the highest values of CWV. Apart from aerosols, the shortwave fluxes are also affected by clouds and by the seasonal changes in CWV. The fluxes are combined to provide estimates of the divergence of radiation across the atmosphere throughout 2006. The longwave divergence is remarkably constant through the year, because of a compensation between the seasonal variations in the outgoing longwave radiation (OLR) and surface net longwave radiation. A simple model of the greenhouse effect is used to interpret this result in terms of the dependence of the normalized greenhouse effect at the TOA and of the effective emissivity of the atmosphere at the surface on the CWV. It is shown that, as the CWV increases, the atmosphere loses longwave energy to the surface with about the same increasing efficiency with which it traps the OLR, thus keeping the atmospheric longwave divergence roughly constant. The shortwave divergence is mainly determined by the CWV and aerosol loadings and the effect of clouds is much smaller than on the component fluxes.

  15. Broadband dispersion extraction using simultaneous sparse penalization

    E-Print Network [OSTI]

    Saligrama, Venkatesh

    the borehole and thus dispersion analysis is of considerable interest to the geophysical and oilfield services community. A brief survey of borehole acoustic waves and their use in mechanical characterization is a function of frequency. This function characterizes the mode and is referred to as a dispersion curve

  16. Metasurfaces for suppressing reflection over broadband

    E-Print Network [OSTI]

    Patra, Anuradha; Nagarajan, Arvind; Achanta, Venu Gopal

    2015-01-01T23:59:59.000Z

    Surfaces patterned with arrays of quasi-periodic air holes having conical depth profile have been studied for their effectiveness in suppressing air-substrate reflection in the wavelength range of 450-1350 nm (limited by our measurement). The role of quasi-periodic air-hole pattern, depth of holes and launch angle on the observed antireflection behavior are investigated. The average optical transmittance of the patterned quartz substrate at near normal incidence is more than 97% and reflectance is less than 2%. Patterned quartz surfaces with 450 nm thin graded rarefaction region maintain the antireflective property up to 30{\\deg} (limited by our measurements) angle of incidence.

  17. Optimal broadband antireflective taper Yinan Zhang,1,

    E-Print Network [OSTI]

    Loncar, Marko

    lead to a significant performance improve- ment in stealth technology and photovoltaics [6: we define the optical length of the tapered section to be L Rl 0 nxdx, where nx is the material >>>>>: dE du i2 L ZuHu dH du i2 L 1 Zu Eu ; 2 where Z p is the material impedance. From Eq. (2

  18. A broadband transformation-optics metasurface lens

    SciTech Connect (OSTI)

    Wan, Xiang; Xiang Jiang, Wei; Feng Ma, Hui; Jun Cui, Tie, E-mail: tjcui@seu.edu.cn [State Key Laboratory of Millimeter Waves, School of Information Science and Engineering, Southeast University, Nanjing 210096 (China)

    2014-04-14T23:59:59.000Z

    We present a transformational metasurface Luneburg lens based on the quasi-conformal mapping method, which has weakly anisotropic constitutive parameters. We design the metasurface lens using inhomogeneous artificial structures to realize the required surface refractive indexes. The transformational metasurface Luneburg lens is fabricated and the measurement results demonstrate very good performance in controlling the radiated surface waves.

  19. ARM - Measurement - Net broadband total irradiance

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadap Documentation TDMADAP : XDCnarrowband upwelling irradiance ARM DatagovMeasurementsNet

  20. ARM - Measurement - Shortwave broadband direct normal irradiance

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadap Documentation TDMADAP : XDCnarrowband upwellingpolarization ARMdownwelling irradiance

  1. ARM - Measurement - Shortwave broadband total net irradiance

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadap Documentation TDMADAP : XDCnarrowband upwellingpolarization ARMdownwellingtotal

  2. ARM - Measurement - Shortwave broadband total upwelling irradiance

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadap Documentation TDMADAP : XDCnarrowband upwellingpolarization ARMdownwellingtotalupwelling

  3. The Broadband Heating Rate Profile (BBHRP) VAP

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What'sis Taking Over Our InstagramStructureProposedPAGESafetyTed5, 2015 IndependentThe

  4. Longwave Scattering E ects of Mineral Aerosols Jean-Louis Dufresne 1 , Catherine Gautier 2 , Paul Ricchiazzi

    E-Print Network [OSTI]

    Dufresne, Jean-Louis

    , Paul Ricchiazzi Institute for Computational Earth System Science (ICESS), Ellison Hall, UCSB, Santa d'Optique Atmosph#19;erique (LOA), Universit#19;e de Lille 1, 59655 Villeneuve d'Ascq Cedex, France. Yves.Fouquart@univ-lille1.fr Accepted for publication in the \\Journal of the Atmospheric Sciences

  5. Co-located analysis of ice clouds detected from space and their impact on longwave energy transfer 

    E-Print Network [OSTI]

    Nankervis, Christopher James

    2013-07-01T23:59:59.000Z

    A lack of quality data on high clouds has led to inadequate representations within global weather and climate models. Recent advances in spaceborne measurements of the Earth’s atmosphere have provided complementary information ...

  6. Using Narrow and Wide Field of View Instruments to Evaluate Longwave Parameterizations for Fair Weather Cumulus Cloud Fields

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What'sis Taking Over OurThe Iron SpinPrincetonUsing Maps to Predict Solar Futures Using Maps toUsing

  7. Molecular beam epitaxy growth and characterization of type-II InAs/GaSb strained layer superlattices for long-wave infrared detection

    E-Print Network [OSTI]

    New Mexico, University of

    . Sharma, and S. Krishna Center for High Technology Materials, University of New Mexico, 1313 Goddard St SE, Albuquerque, New Mexico 87106 S. J. Lee and S. K. Noh Korea Research Institute Standards and Science (KRISS imaging. It includes satellite-based surveillance, atmo- spheric pollution probes, and astrophysical

  8. Development and application of WRF3.3-CLM4crop to study of agriculture - climate interaction

    E-Print Network [OSTI]

    Lu, Yaqiong

    2013-01-01T23:59:59.000Z

    and (c) downward solar radiation. 28   Figure 7.view of downward solar radiation, upward longwave radiation,is the balance between net solar radiation and net longwave

  9. A Chance-Constrained Model & Cutting Planes for Fixed Broadband ...

    E-Print Network [OSTI]

    2011-03-04T23:59:59.000Z

    of-sight and operating in licensed frequency bands. The rapid and ... operate link uv ? E at bandwidth bw ... The joint chance constraint (1) is now equiv-.

  10. High Efficiency Broadband Envelope-Tracking Power Amplifiers

    E-Print Network [OSTI]

    Yan, Jonmei Johana

    17] Bumman, K. , et.al; "Efficiently Amplified," MicrowaveM. ,   “   Wideband High Efficiency Envelope Tracking PowerPeter  M. ,  “High-Efficiency Envelope Tracking High Power

  11. Multi-view, broadband, acoustic classification of marine animals

    E-Print Network [OSTI]

    Roberts, Paul L. D.

    2009-01-01T23:59:59.000Z

    in Electrical Engineering (Applied Ocean Sciences) by PaulDiego M.S. Electrical Engineering (Applied Ocean Sciences),Diego Ph.D. Electrical Engineering (Applied Ocean Sciences),

  12. Simple, Broadband Relative Phase Measurement of Intermodulation Products

    E-Print Network [OSTI]

    . The method uses three phase-locked sources and common equipment found in a microwave laboratory. I large-signal excitation. The majority of these techniques can only measure the phase of harmonics DUT, but was used in [2] to measure the phase of intermodulation products in two-tone excitation

  13. Broadband high resolution X-ray spectral analyzer

    DOE Patents [OSTI]

    Silver, E.H.; Legros, M.; Madden, N.W.; Goulding, F.; Landis, D.

    1998-07-07T23:59:59.000Z

    A broad bandwidth high resolution X-ray fluorescence spectrometer has a performance that is superior in many ways to those currently available. It consists of an array of 4 large area microcalorimeters with 95% quantum efficiency at 6 keV and it produces X-ray spectra between 0.2 keV and 7 keV with an energy resolution of 7 to 10 eV. The resolution is obtained at input count rates per array element of 10 to 50 Hz in real-time, with analog pulse processing and thermal pile-up rejection. This performance cannot be matched by currently available X-ray spectrometers. The detectors are incorporated into a compact and portable cryogenic refrigerator system that is ready for use in many analytical spectroscopy applications as a tool for X-ray microanalysis or in research applications such as laboratory and astrophysical X-ray and particle spectroscopy. 6 figs.

  14. Broadband high resolution X-ray spectral analyzer

    DOE Patents [OSTI]

    Silver, Eric H. (Berkeley, CA); Legros, Mark (Berkeley, CA); Madden, Norm W. (Livermore, CA); Goulding, Fred (Lafayette, CA); Landis, Don (Pinole, CA)

    1998-01-01T23:59:59.000Z

    A broad bandwidth high resolution x-ray fluorescence spectrometer has a performance that is superior in many ways to those currently available. It consists of an array of 4 large area microcalorimeters with 95% quantum efficiency at 6 keV and it produces x-ray spectra between 0.2 keV and 7 keV with an energy resolution of 7 to 10 eV. The resolution is obtained at input count rates per array element of 10 to 50 Hz in real-time, with analog pulse processing and thermal pile-up rejection. This performance cannot be matched by currently available x-ray spectrometers. The detectors are incorporated into a compact and portable cryogenic refrigerator system that is ready for use in many analytical spectroscopy applications as a tool for x-ray microanalysis or in research applications such as laboratory and astrophysical x-ray and particle spectroscopy.

  15. Modeling broadband poroelastic propagation using an asymptotic approach

    E-Print Network [OSTI]

    Vasco, Donald W.

    2010-01-01T23:59:59.000Z

    for coupling porous f ow and geomechanics, SPE Journal, 11,modeling of f uid f ow and geomechanics is vast but lacking

  16. Title of Dissertation: RESOURCE ALLOCATION ISSUES IN BROADBAND WIRELESS NETWORKS

    E-Print Network [OSTI]

    Koutsopoulos, Iordanis

    of modulation level and transmission power in a multi-cell OFDM network. We study the impact of those parameters for flexible adaptation to varying channel conditions, by allowing transmission parameter control for each, transmission powers and rates with the objective to increase total achievable system rate and provide Qo

  17. LOWPASS BROADBAND HARMONIC FILTER DESIGN A THESIS SUBMITTED TO

    E-Print Network [OSTI]

    Hava, Ahmet

    . Nevzat ÖZAY METU, (EE) _____________________ Dr. Ahmet Erbil NALÇACI (Energy Market Regulatory Authority regulation, energy efficiency, size, and cost. The parallel/series harmonic resonance problem related issues/currents. Thus, the size and the performance of the filter can be optimized. The analytical method is verified

  18. Engineering the initial state in broadband population inversion

    E-Print Network [OSTI]

    Bo Y. Chang; Sheokmin Shin; Ignacio R. Sola

    2015-03-03T23:59:59.000Z

    Quantum systems with sublevel structures prevent full population inversion from one manifold of sublevels to the other using strong ultrafast resonant pulses. In this work we explain the mechanism by which this population transfer is blocked. We then develop a novel concept of geometric control, assuming full or partial coherent manipulation within the manifolds and show that by preparing specific coherent superpositions in the initial manifold, full population inversion or full population blockade, {\\it i.e} laser-induced transparency, can be achieved. In particular, by parallel population transfer we show how population inversion between the manifolds can be obtained with minimal pulse area. As the number of sublevels increases, population inversion can overcome the pulse area theorem at the expense of full control over the initial manifold of sublevels.

  19. The Political Economies of Broadband Development in Korea and Japan

    E-Print Network [OSTI]

    Kushida, Kenji; Oh, Seung-Youn

    2007-01-01T23:59:59.000Z

    Structural Change and Deregulation. ” 53. Yuko Suda, “Japan’rules, often comprises deregulation , a relaxing of rules,Structural change and deregulation in the telecommunications

  20. Broadband Dielectric Spectroscopy on Glass-Forming Propylene Carbonate

    E-Print Network [OSTI]

    U. Schneider; P. Lunkenheimer; R. Brand; A. Loidl

    1998-12-14T23:59:59.000Z

    Dielectric spectroscopy covering more than 18 decades of frequency has been performed on propylene carbonate in its liquid and supercooled-liquid state. Using quasi-optic submillimeter and far-infrared spectroscopy the dielectric response was investigated up to frequencies well into the microscopic regime. We discuss the alpha-process whose characteristic timescale is observed over 14 decades of frequency and the excess wing showing up at frequencies some three decades above the peak frequency. Special attention is given to the high-frequency response of the dielectric loss in the crossover regime between alpha-peak and boson-peak. Similar to our previous results in other glass forming materials we find evidence for additional processes in the crossover regime. However, significant differences concerning the spectral form at high frequencies are found. We compare our results to the susceptibilities obtained from light scattering and to the predictions of various models of the glass transition.

  1. Broadband dielectric response of glycerol and propylene carbonate: a comparison

    E-Print Network [OSTI]

    P. Lunkenheimer; U. Schneider; R. Brand; A. Loidl

    1998-12-15T23:59:59.000Z

    Dielectric data on glycerol and propylene carbonate covering 18 decades of frequency are presented and compared to each other. Both materials exhibit qualitatively similar behavior except for marked differences in the high-frequency region just below the boson peak. The results on both materials are consistent with the mode coupling theory of the glass transition.

  2. Particle-swarm optimization of broadband nanoplasmonic arrays

    E-Print Network [OSTI]

    ], radiative rate enhancement [2], solar cells [3], and label-free optical biosensors [4]. Until now, flocks of birds, and shoals of fish. In a PSO sys- tem, a swarm of W trial solutions, called particles

  3. Ultracompact, broadband slot waveguide polarization splitter Shiyun Lin,1

    E-Print Network [OSTI]

    -of-plane transverse directions. In con- ventional rib or channel waveguide configurations, however, the attainable-waveguide coupler for efficient channeling of the mixed-polarization light from an optical fiber to a single mode silicon channel waveguide, a directional coupler section where a slot waveguide and a channel waveguide

  4. Investigation of optical wireless systems for indoor broadband networks

    E-Print Network [OSTI]

    Kouroupetroglou, Georgios

    in the light emitting diodes (LEDs) of a visible light communication (VLC) system are investigated. Keywords emitting diodes (LEDs) emitting in the visible spectral range has recently gained increasing attention been reported covering bit rates up to 50 Mb/s [5]. Optical wireless communications with (light

  5. Ultra-broadband pulse evolution in optical parametric oscillators

    E-Print Network [OSTI]

    with conventional solutions based on the three coupled-amplitude equations. By treating the interacting waves. Armstrong, N. Bloembergen, J. Ducuing, and P. S. Pershan, "Interactions between Light Waves in a Nonlinear inside reverse- photon-exchanged periodically poled lithium niobate waveguides," Opt. Lett. 32(17), 2478

  6. High Efficiency Broadband Envelope-Tracking Power Amplifiers

    E-Print Network [OSTI]

    Yan, Jonmei Johana

    of the combiner, power losses, and amplifier switchingand the power ). The power loss in the modulator can besuch that The dynamic power loss of the dynamic modulator

  7. Cryogenic Calibration Setup for Broadband Complex Impedance Measurements

    E-Print Network [OSTI]

    Diener, P; Marrache-Kikuchi, C; Aprili, M; Gabelli, J

    2013-01-01T23:59:59.000Z

    Reflection measurements give access to the complex impedance of a material on a wide frequency range. This is of interest to study the dynamical properties of various materials, for instance disordered superconductors. However reflection measurements made at cryogenic temperature suffer from the difficulty to reliably subtract the circuit contribution. Here we report on the design and first tests of a setup able to precisely calibrate in situ the sample reflection, at 4.2 K and up to 2 GHz, by switching and measuring, during the same cool down, the sample and three calibration standards.

  8. HIGH-FIDELITY, BROADBAND AMPLIFICATION AND FILTERING FOR SPACEBORNE INSTRUMENTATION

    E-Print Network [OSTI]

    , to obtain in-situ measurements of wave electric fields. With such phenomena spanning four decades-end, which is fabricated in a commercial 0.25-µm SiGe BiCMOS process, features both a high-impedance, low

  9. Modeling broadband poroelastic propagation using an asymptotic approach

    E-Print Network [OSTI]

    Vasco, Donald W.

    2010-01-01T23:59:59.000Z

    Thermal Operations and Heavy Oil Symposium, p. 97848, CHOA.activity at the cold lake heavy oil f eld, alberta canada,

  10. A Broadband Tensorial Magnetotelluric Study In The Travale Geothermal...

    Open Energy Info (EERE)

    cover formations and of the intensity of the artificial disturbances from local power stations and distribution lines. Nevertheless it has been possible to obtain good...

  11. Broadband Spectra and Variability of BL Lacertae in 2000

    E-Print Network [OSTI]

    M. Boettcher; H. D. Aller; M. F. Aller; O. Mang; C. M. Raiteri; M. Ravasio; G. Tagliaferri; H. Teraesranta; M. Villata

    2002-03-21T23:59:59.000Z

    We have organized an extensive multiwavelength campaign on BL Lacertae in the second half of 2000. Simultaneous or quasi-simultaneous observations were taken at radio frequencies, in the optical - carried out by the WEBT collaboration -, in X-rays - using BeppoSAX and RXTE -, and at VHE gamma-rays with the CAT and HEGRA Cherenkov telescope facilities. In this paper, we are presenting first results from this campaign. The WEBT optical campaign achieved an unprecedented time coverage, virtually continuous over several 10 - 20 hour segments, and revealed intraday variability on time scales of ~ 1.5 hours. The X-ray observations of Nov. 1 - 2, 2000, revealed significant variability on similar time scales, and provided evidence for the synchrotron spectrum extending out to ~ 10 keV during that time. At higher energies, the onset of the hard power-law commonly observed in radio-loud quasars and radio-selected BL Lac objects is seen. From the energy-resolved X-ray variability patterns, we find evidence that electron cooling might not be dominated by one single radiation mechanism; rather, a combination of synchrotron and Compton cooling seems to be required.

  12. Broadband Spectra and Variability of BL Lacertae in 2000

    E-Print Network [OSTI]

    Böttcher, M; Aller, M F; Mang, O; Raiteri, C M; Ravasio, M; Tagliaferri, G; Teraesranta, H; Villata, M

    2002-01-01T23:59:59.000Z

    We have organized an extensive multiwavelength campaign on BL Lacertae in the second half of 2000. Simultaneous or quasi-simultaneous observations were taken at radio frequencies, in the optical - carried out by the WEBT collaboration -, in X-rays - using BeppoSAX and RXTE -, and at VHE gamma-rays with the CAT and HEGRA Cherenkov telescope facilities. In this paper, we are presenting first results from this campaign. The WEBT optical campaign achieved an unprecedented time coverage, virtually continuous over several 10 - 20 hour segments, and revealed intraday variability on time scales of ~ 1.5 hours. The X-ray observations of Nov. 1 - 2, 2000, revealed significant variability on similar time scales, and provided evidence for the synchrotron spectrum extending out to ~ 10 keV during that time. At higher energies, the onset of the hard power-law commonly observed in radio-loud quasars and radio-selected BL Lac objects is seen. From the energy-resolved X-ray variability patterns, we find evidence that electron...

  13. Implementing the National Broadband Plan by Empowering Consumers...

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

    and other entities 1 to empower consumers (and perhaps others) through access to detailed energy information in electronic form-including real-time information from smart meters,...

  14. Simulation of free-electron lasers seeded with broadband radiation

    E-Print Network [OSTI]

    Bajlekov, Svetoslav

    2012-01-01T23:59:59.000Z

    The European X-Ray Free-Electron Laser Technical DesignSimulation of free-electron lasers seeded with broadbandcoherence of free-electron laser (FEL) radiation can be

  15. TCP SPLITTING PROTOCOL FOR BROADBAND AERONAUTICAL SATELLITE NETWORK

    E-Print Network [OSTI]

    Baras, John S.

    . According to the Federal Aviation Administration (FAA) Aerospace Forecasts 2002-2013, domestic operations (e end-to-end TCP, especially in burst error environment. Introduction America's aviation industry in 2013 [1]. The National Airspace System (NAS) is one of the safest and most secure aviation systems

  16. Simulation of free-electron lasers seeded with broadband radiation

    E-Print Network [OSTI]

    Bajlekov, Svetoslav

    2012-01-01T23:59:59.000Z

    in Proceedings of FEL 2006 (BESSY, Berlin, Germany, 2006) p.in Proceedings of FEL 2006 (BESSY, Berlin, Germany, 2006) p.in Proceedings of FEL 2006 (BESSY, Berlin, Germany, 2006) p.

  17. High Efficiency Broadband Envelope-Tracking Power Amplifiers

    E-Print Network [OSTI]

    Yan, Jonmei Johana

    M. ,   “   Wideband High Efficiency Envelope Tracking PowerPeter  M. ,  “High-Efficiency Envelope Tracking High PowerMemory! DPD! Drain! Efficiency! (%)! Gain! (dB)! Output!

  18. VIMOS total transmission profiles for broad-band filters

    E-Print Network [OSTI]

    S. Mieske; M. Rejkuba; S. Bagnulo; C. Izzo; G. Marconi

    2007-04-13T23:59:59.000Z

    VIMOS is a wide-field imager and spectrograph mounted on UT3 at the VLT, whose FOV consists of four 7'x8' quadrants. Here we present the measurements of total transmission profiles -- i.e. the throughput of telescope + instrument -- for the broad band filters U, B, V, R, I, and z for each of its four quadrants. Those measurements can also be downloaded from the public VIMOS web-page. The transmission profiles are compared with previous estimates from the VIMOS consortium.

  19. Broadband mid-infrared frequency upconversion and spectroscopy with

    E-Print Network [OSTI]

    ,6] and Fourier transform in- terferometry [2]. Recently, however, we have demon- strated direct detection and components along with less sensitive, more expensive, and lower bandwidth detec- tors. A demonstrated at 1060 nm, with average power of up to 6 W, and 170 fs duration after recompression. These amplified

  20. Leica TCS SP5 The Only Broadband Confocal

    E-Print Network [OSTI]

    Adams, Mark

    system · Automatic calibration routines: safe and convenient · Intensity control by intermediate image Panel G Control Monitor G Image Monitor G Supply Control G Optical Table for Multiphoton Systems G Beam diameter control motorized by software, automatic mode available Scanner scanning concept optically correct

  1. Broadband super-collimation in a hybrid photonic crystal structure

    E-Print Network [OSTI]

    Hamam, Rafif E.

    We propose a two dimensional (2D) photonic crystal (PhC) structure that supports super-collimation over a large frequency range (over 4 times that of a traditional square lattice of holes). We theoretically and numerically ...

  2. Re: DOE Request for Information - Implementing the National Broadband...

    Office of Environmental Management (EM)

    Federal Smart Grid Policy More Documents & Publications Reply Comments of T-Mobile USA, Inc. Re: NBP RFI: Communications Requirements NBP RFI: Communications Requirements -...

  3. Software-related Energy Footprint of a Wireless Broadband Module

    E-Print Network [OSTI]

    on the power consumption. This opens up for potential energy savings by creating better ap- plications Keywords 3G, Energy footprint, Power consumption, Wireless broad- band 1. INTRODUCTION The battery lifetime the energy consumption is an essential part of de- veloping new hardware components, it has been a neglected

  4. Broadband electrooptic modulators based on gallium arsenide materials

    E-Print Network [OSTI]

    Shamir, Orit A

    2012-01-01T23:59:59.000Z

    Optical Arbitrary Waveform Generation (OAWG) combines frequency combs and frequency-by- frequency pulse shapers to synthesize optical waveforms. The OAWG technique has a wide variety of applications, ranging from high ...

  5. Broadband VLF measurements of lightning-induced ionospheric perturbations

    E-Print Network [OSTI]

    Cummer, Steven A.

    2005. [1] Very low frequency (VLF) electromagnetic pulses radiated by lightning are an effective tool with the theoretically predicted ionization changes produced directly by the lightning electromagnetic pulse. Citation over the thunderstorm due to the heating of ionospheric electrons by the electromagnetic pulse (EMP

  6. Material loss angles from direct measurements of broadband thermal noise

    E-Print Network [OSTI]

    Principe, Maria; Pierro, Vincenzo; DeSalvo, Riccardo; Taurasi, Ilaria; Villar, Akira E; Black, Eric D; Libbrecht, Kenneth G; Michel, Christophe; Morgado, Nazario; Pinard, Laurent

    2015-01-01T23:59:59.000Z

    We estimate the loss angles of the materials currently used in the highly reflective test-mass coatings of interferometric detectors of gravitational waves, namely Silica, Tantala, and Ti-dop ed Tantala, from direct measurement of coating thermal noise in an optical interferometer testbench, the Caltech TNI. We also present a simple predictive theory for the material properties of amorphous glassy oxide mixtures, which gives results in good agreement with our measurements on Ti-doped Tantala. Alternative measure ment methods and results are reviewed, and some critical issues are discussed.

  7. Broadband UHF RFID/Sensor Modules for Pervasive Cognition Applications

    E-Print Network [OSTI]

    Tentzeris, Manos

    printing, can be used instead of metal etching techniques. In addition, paper is compatible with circuit additional modules like sensors and batteries to be mounted on or embedded in. A fast process like inkjet constant r (~3) is close to air's which means electromagnetic power can penetrate easily even if the RFID

  8. Modeling broadband poroelastic propagation using an asymptotic approach

    E-Print Network [OSTI]

    Vasco, Donald W.

    2010-01-01T23:59:59.000Z

    propagation, the frequency dependence of a disturbance in alower frequencies the scale length of the disturbance willthe frequency dependence of an elas- tic disturbance (109)

  9. Research paper Response to broadband repetitive stimuli in auditory

    E-Print Network [OSTI]

    Kilgard, Michael P.

    , USA b The University of Oklahoma, Bioengineering Center, 100 East Boyd St., T-335 Sarkeys Energy School of Behavioral and Brain Sciences, GR41 Richardson, TX 75083, USA Received 25 August 2005; received in the central auditory system is essential to understand- ing audition in general and speech processing

  10. An integrated source of broadband quadrature squeezed light

    E-Print Network [OSTI]

    Hoff, Ulrich B; Andersen, Ulrik L

    2015-01-01T23:59:59.000Z

    An integrated silicon nitride resonator is proposed as an ultra-compact source of bright single-mode quadrature squeezed light at 850 nm. Optical properties of the device are investigated and tailored through numerical simulations, with particular attention paid to loss associated with interfacing the device. An asymmetric double layer stack waveguide geometry with inverse vertical tapers is proposed for efficient and robust fibre-chip coupling, yielding a simulated total loss of -0.75 dB/facet. We assess the feasibility of the device through a full quantum noise analysis and derive the output squeezing spectrum for intra-cavity pump self-phase modulation. Subject to standard material loss and detection efficiencies, we find that the device holds promises for generating substantial quantum noise squeezing over a bandwidth exceeding 1 GHz. In the low-propagation loss regime, approximately -7 dB squeezing is predicted for a pump power of only 50 mW.

  11. Basilar membrane responses to broadband stimuli Alberto Recioa)

    E-Print Network [OSTI]

    Kemnitz, Joseph

    -phase complexes--were recorded at several sites at the base of the chinchilla cochlea. Recording sites of the chinchilla cochlea as well as responses to Schroeder-phase complexes. It has been shown that BM responses locations along the BM. Because the hook region in the chinchilla has been little investigated Narayan

  12. ARM - Publications: Science Team Meeting Documents: Comparison of broadband

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of ScienceandMesa-Anomalous Radiative AbsorptionARM InArctic Facility forof several GCMsModel and

  13. Implementing the National Broadband Plan by Empowering Consumers and the

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742Energy ChinaofSchaefer To:DepartmentDepartment of Energy Implementing Agreement

  14. Implementing the National Broadband Plan by Empowering Consumers and the

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742Energy ChinaofSchaefer To:DepartmentDepartment of Energy Implementing AgreementSmart Grid:

  15. Implementing the National Broadband Plan by Studying the Communications

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742Energy ChinaofSchaefer To:DepartmentDepartment of Energy Implementing AgreementSmart

  16. In the Matter of National Broadband Plan Request for Information:

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742Energy ChinaofSchaefer To:DepartmentDepartment of EnergyEnergy John SchuelerIn

  17. A Broadband Tensorial Magnetotelluric Study In The Travale Geothermal Field

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand Jump to:Ezfeedflag JumpID-fTriWildcat 1 Windthe CommissionEnergyEnergySeismic Response ofBrief| Open

  18. Status of the Broadband Heating Rate Profile (BBHRP) VAP

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What'sis Taking Over Our Instagram Secretary900 SpecialNanoparticulateEmissions

  19. DOE Request for Information - Implementing the National Broadband Plan by

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn't Your Destiny: Theof"WaveInteractions and PolicyCybersecurity Threats |AND REGIONAL

  20. Re: DOE Request for Information - Implementing the National Broadband

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOn April 23, 2014, an OHASeptember 2010In addition to 1 |DDOERue, GasScorePlan by

  1. Re: DOE Request for Information - Implementing the National Broadband

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOn April 23, 2014, an OHASeptember 2010In addition to 1 |DDOERue, GasScorePlan byPlan by

  2. Re: DOE Request for Information - Implementing the National Broadband

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOn April 23, 2014, an OHASeptember 2010In addition to 1 |DDOERue, GasScorePlan byPlan

  3. Re: DOE Request for Information - Implementing the National Broadband

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOn April 23, 2014, an OHASeptember 2010In addition to 1 |DDOERue, GasScorePlan byPlanPlan

  4. Re: DOE Request for Information - Implementing the National Broadband

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOn April 23, 2014, an OHASeptember 2010In addition to 1 |DDOERue, GasScorePlan

  5. Re: DOE Request for Information - Implementing the National Broadband

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOn April 23, 2014, an OHASeptember 2010In addition to 1 |DDOERue, GasScorePlanPlan by

  6. Re: DOE Request for Information - Implementing the National Broadband

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOn April 23, 2014, an OHASeptember 2010In addition to 1 |DDOERue, GasScorePlanPlan byPlan

  7. Re: Implementing the National Broadband Plan by Empowering Consumers and

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOn April 23, 2014, an OHASeptember 2010In addition to 1 |DDOERue, GasScorePlanPlan

  8. Re: Implementing the National Broadband Plan by Studying the Communications

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOn April 23, 2014, an OHASeptember 2010In addition to 1 |DDOERue,

  9. Re: National Broadband Plan (NBP) Request for Information: Data Access |

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOn April 23, 2014, an OHASeptember 2010In addition to 1 |DDOERue,ConsumersDepartment of

  10. Wireless Mobile Broadband via Femtocells As people and businesses move away from fixed telephony services toward mobile broadband

    E-Print Network [OSTI]

    .Reed@nicta.com.au Business Development Glenn Downey Neville Roach Laboratory Tel: +61 403 433 566 Email: Glenn Roach Laboratory Level 4, 223 Anzac Parade Kensington NSW 2052 University of NSW Locked Bag 6016 Sydney

  11. Suggestions for the measurement and derivation of fluxes and flux divergences from a satellite

    SciTech Connect (OSTI)

    Man-Li C. Wu (NASA Goddard Space Flight Center, Greenbelt, MD (United States))

    1990-04-15T23:59:59.000Z

    The theoretical studies shown here indicate that the best bands to measure and derive the total outgoing longwave radiation (OLR), surface downward flux (SDF), and cooling rates (CRs) using linear regression are (1) the band between 800 and 1,200 cm{sup {minus}1} for OLR, (2) the band between 500 and 660 cm{sup {minus}1} or 660 and 800 cm{sup {minus}1} for SDF, and (3) the band between 660 and 800 cm{sup {minus}1} for CRs. These results are obtained from scatter plots of total fluxes and cooling rates associated with the various bands. The advanced very high resolution radiometer OLR is damped compared with the Nimbus 7 Earth radiation budget (ERB) OLR, which is derived from the broadband, narrow field of view ERB instrument, owing to its use of only one narrow band (centered around the 11-{mu}m window region) measurement.

  12. Convective signals from surface measurements at ARM Tropical Western Pacific site: Manus

    SciTech Connect (OSTI)

    Wang, Yi; Long, Charles N.; Mather, James H.; Liu, Xiaodong

    2011-02-04T23:59:59.000Z

    Madden-Julian Oscillation (MJO) signals have been detected using highly sampled observations from the U.S. DOE ARM Climate Research Facility located at the Tropical Western Pacific Manus site. Using downwelling shortwave radiative fluxes and derived shortwave fractional sky cover, and the statistical tools of wavelet, cross wavelet, and Fourier spectrum power, we report finding major convective signals and their phase change from surface observations spanning from 1996 to 2006. Our findings are confirmed with the satellite-gauge combined values of precipitation from the NASA Global Precipitation Climatology Project and the NOAA interpolated outgoing longwave radiation for the same location. We find that the Manus MJO signal is weakest during the strongest 1997-1998 El Nin˜o Southern Oscillation (ENSO) year. A significant 3-5-month lead in boreal winter is identified further between Manus MJO and NOAA NINO3.4 sea surface temperature (former leads latter). A striking inverse relationship is found also between the instantaneous synoptic and intraseasonal phenomena over Manus. To further study the interaction between intraseasonal and diurnal scale variability, we composite the diurnal cycle of cloudiness for 21-MJO events that have passed over Manus. Our diurnal composite analysis of shortwave and longwave fractional sky covers indicates that during the MJO peak (strong convection), the diurnal amplitude of cloudiness is reduced substantially, while the diurnal mean cloudiness reaches the highest value and there are no significant phase changes. We argue that the increasing diurnal mean and decreasing diurnal amplitude are caused by the systematic convective cloud formation that is associated with the wet phase of the MJO, while the diurnal phase is still regulated by the well-defined solar forcing. This confirms our previous finding of the anti-phase relationship between the synoptic and intraseasonal phenomena. The detection of theMJOover the Manus site provides further opportunities in using other ground-based remote sensing instruments to investigate the vertical distributions of clouds and radiative heatings of the MJO that currently is impossible from satellite observations.

  13. Contribution to the development of DOE ARM Climate Modeling Best Estimate Data (CMBE) products: Satellite data over the ARM permanent and AMF sites: Final Report

    SciTech Connect (OSTI)

    Xie, B; Dong, X; Xie, S

    2012-05-18T23:59:59.000Z

    To support the LLNL ARM infrastructure team Climate Modeling Best Estimate (CMBE) data development, the University of North Dakota (UND)'s group will provide the LLNL team the NASA CERES and ISCCP satellite retrieved cloud and radiative properties for the periods when they are available over the ARM permanent research sites. The current available datasets, to date, are as follows: the CERES/TERRA during 200003-200812; the CERES/AQUA during 200207-200712; and the ISCCP during 199601-200806. The detailed parameters list below: (1) CERES Shortwave radiative fluxes (net and downwelling); (2) CERES Longwave radiative fluxes (upwelling) - (items 1 & 2 include both all-sky and clear-sky fluxes); (3) CERES Layered clouds (total, high, middle, and low); (4) CERES Cloud thickness; (5) CERES Effective cloud height; (6) CERES cloud microphysical/optical properties; (7) ISCCP optical depth cloud top pressure matrix; (8) ISCCP derived cloud types (r.g., cirrus, stratus, etc.); and (9) ISCCP infrared derived cloud top pressures. (10) The UND group shall apply necessary quality checks to the original CERES and ISCCP data to remove suspicious data points. The temporal resolution for CERES data should be all available satellite overpasses over the ARM sites; for ISCCP data, it should be 3-hourly. The spatial resolution is the closest satellite field of view observations to the ARM surface sites. All the provided satellite data should be in a format that is consistent with the current ARM CMBE dataset so that the satellite data can be easily merged into the CMBE dataset.

  14. Evaluating Radiative Closure in the Middle-to-Upper Troposhere

    SciTech Connect (OSTI)

    Tobin, David C; Turner, David D; Knuteson, Robert O

    2013-01-02T23:59:59.000Z

    This project had two general objectives. The first is the characterization and improvement of the radiative transfer parameterization in strongly absorbing water vapor bands, as these strongly absorbing bands dictate the clear sky radiative heating rate. The second is the characterization and improvement of the radiative transfer in cirrus clouds, with emphasis on ensuring that the parameterization of the radiative transfer is consistent and accurate across the spectrum. Both of these objectives are important for understanding the radiative processes in the mid-to-upper troposphere. The research on this project primarily involved analysis of data from the First and Second Radiative Heating in Underexplored Bands Campaigns, RHUBC-I and II. This included a climate model sensitivity study using results from RHUBC-I. The RHUBC experiments are ARM-funded activities that directly address the objectives of this research project. A secondary effort was also conducted that investigated the trends in the long-term (~14 year) dataset collected by the Atmospheric Emitted Radiance Interferometer (AERI) at the ARM Southern Great Plains site. This work, which was primarily done by a post-doc at the University of Wisconsin �������¢���������������� Madison under Dr. Turner�������¢����������������s direction, uses the only NIST-traceable instrument at the ARM site that has a well-documented calibration and uncertainty performance to investigate long-term trends in the downwelling longwave radiance above this site.

  15. Ocean dynamics and thermodynamics in the tropical Indo- Pacific region

    E-Print Network [OSTI]

    Drushka, Kyla

    2011-01-01T23:59:59.000Z

    westerly (positive) winds force downwelling Kelvin wavesand easterly (negative) winds force upwelling waves, and theIntraseasonal easterly wind anomalies force upwelling Kelvin

  16. Using Radar, Lidar and Radiometer Data from NSA and SHEBA to Quantify Cloud Property Effects on the Surface Heat Budget in the Arctic

    SciTech Connect (OSTI)

    Janet Intrieri; Mathhew Shupe

    2005-01-01T23:59:59.000Z

    Cloud and radiation data from two distinctly different Arctic areas are analyzed to study the differences between coastal Alaskan and open Arctic Ocean region clouds and their respective influence on the surface radiation budget. The cloud and radiation datasets were obtained from (1) the DOE North Slope of Alaska (NSA) facility in the coastal town of Barrow, Alaska, and (2) the SHEBA field program, which was conducted from an icebreaker frozen in, and drifting with, the sea-ice for one year in the Western Arctic Ocean. Radar, lidar, radiometer, and sounding measurements from both locations were used to produce annual cycles of cloud occurrence and height, atmospheric temperature and humidity, surface longwave and shortwave broadband fluxes, surface albedo, and cloud radiative forcing. In general, both regions revealed a similar annual trend of cloud occurrence fraction with minimum values in winter (60-75%) and maximum values during spring, summer and fall (80-90%). However, the annual average cloud occurrence fraction for SHEBA (76%) was lower than the 6-year average cloud occurrence at NSA (92%). Both Arctic areas also showed similar annual cycle trends of cloud forcing with clouds warming the surface through most of the year and a period of surface cooling during the summer, when cloud shading effects overwhelm cloud greenhouse effects. The greatest difference between the two regions was observed in the magnitude of the cloud cooling effect (i.e., shortwave cloud forcing), which was significantly stronger at NSA and lasted for a longer period of time than at SHEBA. This is predominantly due to the longer and stronger melt season at NSA (i.e., albedo values that are much lower coupled with Sun angles that are somewhat higher) than the melt season observed over the ice pack at SHEBA. Longwave cloud forcing values were comparable between the two sites indicating a general similarity in cloudiness and atmospheric temperature and humidity structure between the two regions.

  17. Application of the discontinuous Galerkin time domain method in the simulation of the optical properties of dielectric particles

    E-Print Network [OSTI]

    Tang, Guanglin

    2012-07-16T23:59:59.000Z

    ) and longwave (infrared) cases are considered, with particle size parameters 50 and 100. Ice in shortwave and longwave cases is absorptive and non-absorptive, respectively. The comparisons between DG solutions and the exact solutions in computing the optical...

  18. Plume-induced topography and geoid anomalies and their implications for the Tharsis rise on Mars

    E-Print Network [OSTI]

    Zhong, Shijie

    in influencing long-wave- length gravity anomalies produced by a plume [Zhong, 2002]. Phillips et al. [2001

  19. Interaction of Ekman Layers and Islands MICHAEL A. SPALL AND JOSEPH PEDLOSKY

    E-Print Network [OSTI]

    to that found for the interaction of Ekman layers and an infinite boundary, namely downwelling (upwelling around the island so that the regions of upwelling and downwelling are dynamically connected, for positive wind stress, exhibits an anticyclonic phase rotation with depth (direction of Kelvin wave

  20. Characteristics of broadband lightning emissions associated with terrestrial gamma ray flashes

    E-Print Network [OSTI]

    Cummer, Steven A.

    . Introduction [2] Brief (typically bursts of gamma rays with mean energies of 2 MeV originating from the Earth's atmosphere, referred to as terrestrial gamma ray flashes (TGFs), have been observed by the Burst et al., 2010; Briggs et al., 2010]. With spectra typically harder than cosmic gamma ray bursts

  1. 3-D Model of Broadband Emission from Supernova Remnants Undergoing Non-linear Diffusive Shock Acceleration

    SciTech Connect (OSTI)

    Lee, Shiu-Hang; Kamae, Tuneyoshi; Ellison, Donald C.

    2008-07-02T23:59:59.000Z

    We present a 3-dimensional model of supernova remnants (SNRs) where the hydrodynamical evolution of the remnant is modeled consistently with nonlinear diffusive shock acceleration occurring at the outer blast wave. The model includes particle escape and diffusion outside of the forward shock, and particle interactions with arbitrary distributions of external ambient material, such as molecular clouds. We include synchrotron emission and cooling, bremsstrahlung radiation, neutral pion production, inverse-Compton (IC), and Coulomb energy-loss. Boardband spectra have been calculated for typical parameters including dense regions of gas external to a 1000 year old SNR. In this paper, we describe the details of our model but do not attempt a detailed fit to any specific remnant. We also do not include magnetic field amplification (MFA), even though this effect may be important in some young remnants. In this first presentation of the model we don't attempt a detailed fit to any specific remnant. Our aim is to develop a flexible platform, which can be generalized to include effects such as MFA, and which can be easily adapted to various SNR environments, including Type Ia SNRs, which explode in a constant density medium, and Type II SNRs, which explode in a pre-supernova wind. When applied to a specific SNR, our model will predict cosmic-ray spectra and multi-wavelength morphology in projected images for instruments with varying spatial and spectral resolutions. We show examples of these spectra and images and emphasize the importance of measurements in the hard X-ray, GeV, and TeV gamma-ray bands for investigating key ingredients in the acceleration mechanism, and for deducing whether or not TeV emission is produced by IC from electrons or pion-decay from protons.

  2. Status of SuperSpec: A Broadband, On-Chip Millimeter-Wave Spectrometer

    E-Print Network [OSTI]

    Hailey-Dunsheath, S; Barry, P S; Bradford, C M; Chattopadhyay, G; Day, P; Doyle, S; Hollister, M; Kovacs, A; LeDuc, H G; Mauskopf, P; McKenney, C M; Monroe, R; O'Brient, R; Padin, S; Reck, T; Swenson, L; Tucker, C E; Zmuidzinas, J

    2015-01-01T23:59:59.000Z

    SuperSpec is a novel on-chip spectrometer we are developing for multi-object, moderate resolution (R = 100 - 500), large bandwidth (~1.65:1) submillimeter and millimeter survey spectroscopy of high-redshift galaxies. The spectrometer employs a filter bank architecture, and consists of a series of half-wave resonators formed by lithographically-patterned superconducting transmission lines. The signal power admitted by each resonator is detected by a lumped element titanium nitride (TiN) kinetic inductance detector (KID) operating at 100-200 MHz. We have tested a new prototype device that is more sensitive than previous devices, and easier to fabricate. We present a characterization of a representative R=282 channel at f = 236 GHz, including measurements of the spectrometer detection efficiency, the detector responsivity over a large range of optical loading, and the full system optical efficiency. We outline future improvements to the current system that we expect will enable construction of a photon-noise-lim...

  3. Broad-band contemporaneous study of the Seyfert galaxy NGC 4151

    SciTech Connect (OSTI)

    Bassani, I.; Butler, R.C.; Di Cocco, G.; Della Ventura, A.; Perotti, F.

    1986-12-01T23:59:59.000Z

    The Seyfert galaxy NGC 4151 was observed on May 18, 1980 at hard X-ray/low gamma ray energies with the MISO telescope. The only excess detected was at the 3.5 sigma level in the X-ray energy range 35-105 keV. Concurrent UV, IR, optical and soft X-ray observations performed from January-May 1980 are used in conjunction with the MISO data to estimate the radiation characteristics of NGC 4151 and to define limits to models for the central powerhouse of the object, one of the most luminous in the sky. 39 references.

  4. QUASI-PERIODIC OSCILLATIONS AND BROADBAND VARIABILITY IN SHORT MAGNETAR BURSTS

    SciTech Connect (OSTI)

    Huppenkothen, Daniela; Watts, Anna L.; Uttley, Phil; Van der Horst, Alexander J.; Van der Klis, Michiel [Astronomical Institute ''Anton Pannekoek'', University of Amsterdam, Postbus 94249, 1090-GE Amsterdam (Netherlands); Kouveliotou, Chryssa [Office of Science and Technology, ZP12, NASA Marshall Space Flight Center, Huntsville, AL 35812 (United States); Goegues, Ersin [Sabanc Latin-Small-Letter-Dotless-I University, Orhanl Latin-Small-Letter-Dotless-I -Tuzla, Istanbul 34956 (Turkey); Granot, Jonathan [The Open University of Israel, 1 University Road, P.O. Box 808, Ra'anana 43537 (Israel); Vaughan, Simon [X-Ray and Observational Astronomy Group, University of Leicester, Leicester LE1 7RH (United Kingdom); Finger, Mark H., E-mail: D.Huppenkothen@uva.nl [Universities Space Research Association, Huntsville, AL 35805 (United States)

    2013-05-01T23:59:59.000Z

    The discovery of quasi-periodic oscillations (QPOs) in magnetar giant flares has opened up prospects for neutron star asteroseismology. However, with only three giant flares ever recorded, and only two with data of sufficient quality to search for QPOs, such analysis is seriously data limited. We set out a procedure for doing QPO searches in the far more numerous, short, less energetic magnetar bursts. The short, transient nature of these bursts requires the implementation of sophisticated statistical techniques to make reliable inferences. Using Bayesian statistics, we model the periodogram as a combination of red noise at low frequencies and white noise at high frequencies, which we show is a conservative approach to the problem. We use empirical models to make inferences about the potential signature of periodic and QPOs at these frequencies. We compare our method with previously used techniques and find that although it is on the whole more conservative, it is also more reliable in ruling out false positives. We illustrate our Bayesian method by applying it to a sample of 27 bursts from the magnetar SGR J0501+4516 observed by the Fermi Gamma-ray Burst Monitor, and we find no evidence for the presence of QPOs in any of the bursts in the unbinned spectra, but do find a candidate detection in the binned spectra of one burst. However, whether this signal is due to a genuine quasi-periodic process, or can be attributed to unmodeled effects in the noise is at this point a matter of interpretation.

  5. Broadband visible light source based on AllnGaN light emitting diodes

    SciTech Connect (OSTI)

    Crawford, Mary H.; Nelson, Jeffrey S.

    2003-12-16T23:59:59.000Z

    A visible light source device is described based on a light emitting diode and a nanocluster-based film. The light emitting diode utilizes a semiconductor quantum well structure between n-type and p-type semiconductor materials on the top surface a substrate such as sapphire. The nanocluster-based film is deposited on the bottom surface of the substrate and can be derived from a solution of MoS.sub.2, MoSe.sub.2, WS.sub.2, and WSe.sub.2 particles of size greater than approximately 2 nm in diameter and less than approximately 15 nm in diameter, having an absorption wavelength greater than approximately 300 nm and less than approximately 650 nm.

  6. Advanced Design of Broadband Distributed Amplifier using a SiGe BiCMOS Technology

    E-Print Network [OSTI]

    De Flaviis, Franco

    interfaces, it is essential that RF/microwave circuits be implemented in low-cost silicon technology. However.18 µm CMOS distributed amplifier with Coplanar Strip (CPS) was designed with the unity gain

  7. Broad-band microwave imaging spectroscopy with a solar-dedicated array

    E-Print Network [OSTI]

    , and to study energy release and particle energization in transient events, requires a solarBroad-band microwave imaging spectroscopy with a solar-dedicated array T.S. Bastiana, D.E. Garyb, S of Maryland, College Park, MD 20742 dSolar Astronomy 264-33, Caltech, Pasadena, CA 91125 ABSTRACT For many

  8. The Building of the Internet: Implications for the Future of Broadband Networks

    E-Print Network [OSTI]

    Hart, Jeffrey A.; Reed, Robert R.; Bar, Francois

    1992-01-01T23:59:59.000Z

    The Federal High Performance Computing Program (Washington,in 1989- See High Performance Computing and Networking forin 1984. See High Performance Computing and Networking, pp.

  9. Room temperature broadband coherent terahertz emission induced by dynamical photon drag in graphene

    E-Print Network [OSTI]

    Maysonnave, J; Wang, F; Maero, S; Berger, C; de Heer, W; Norris, T B; De Vaulchier, L A; Dhillon, S; Tignon, J; Ferreira, R; Mangeney, J

    2015-01-01T23:59:59.000Z

    Nonlinear couplings between photons and electrons in new materials give rise to a wealth of interesting nonlinear phenomena. This includes frequency mixing, optical rectification or nonlinear current generation, which are of particular interest for generating radiation in spectral regions that are difficult to access, such as the terahertz gap. Owing to its specific linear dispersion and high electron mobility at room temperature, graphene is particularly attractive for realizing strong nonlinear effects. However, since graphene is a centrosymmetric material, second-order nonlinearities a priori cancel, which imposes to rely on less attractive third-order nonlinearities. It was nevertheless recently demonstrated that dc-second-order nonlinear currents as well as ultrafast ac-currents can be generated in graphene under optical excitation. The asymmetry is introduced by the excitation at oblique incidence, resulting in the transfer of photon momentum to the electron system, known as the photon drag effect. Here...

  10. Calibration of erythemally weighted broadband instruments: A comparison between PMOD/WRC and MSL

    SciTech Connect (OSTI)

    Swift, Neil; Nield, Kathryn; Hamlin, John [Measurement Standards Laboratory of New Zealand, Industrial Research Ltd, Lower Hutt (New Zealand); Huelsen, Gregor; Groebner, Julian [Physikalisch-Meteorologisches Observatorium Davos, World Radiation Centre, Davos Dorf (Switzerland)

    2013-05-10T23:59:59.000Z

    A Yankee Environmental Systems (YES) UVB-1 ultraviolet pyranometer, designed to measure erythemally weighted total solar irradiance, was calibrated by the Measurement Standards Laboratory (MSL) in Lower Hutt, New Zealand during August 2010. The calibration was then repeated during July and August 2011 by the Physikalisch-Meteorologisches Obervatorium Davos, World Radiation Center (PMOD/WRC) located in Davos, Switzerland. Calibration results show that measurements of the relative spectral and angular response functions at the two institutes are in excellent agreement, thus providing a good degree of confidence in these measurement facilities. However, measurements to convert the relative spectral response into an absolute calibration disagree significantly depending on whether an FEL lamp or solar spectra are used to perform this scaling. This is the first serious comparison of these scaling methods to formally explore the potential systematic errors which could explain the discrepancy.

  11. Second order coherence of broadband down-converted light on ultrashort time scale

    E-Print Network [OSTI]

    Boyer, Edmond

    correlation is carried out thanks to a modified Hanbury Brown-Twiss interferometer based on two photon. Q. Twiss, "Correlation between photons in two coherent beams of light," Nature 177(4497), 27

  12. Submission to the Broadband & Multimedia Workshop November 11-12, 1996, Zagreb, Croatia

    E-Print Network [OSTI]

    Záruba, Gergely

    of an ATM based B-ISDN the signaling functions will be more complex than in existing systems. Before]. There are local resources like memory, disk requirement and computational power, and global resources like buffer which can use any global and local resources in an efficient way. The aim of our work was to design

  13. The business of broadband and the public interest : media policy for the network society

    E-Print Network [OSTI]

    Schultze, Stephen James

    2008-01-01T23:59:59.000Z

    Media policy in the United States has, since its inception, been governed by the principle that infrastructure providers should serve "the public interest." The Federal Communications Commission has traditionally been ...

  14. A CR-hydro-NEI Model of the Structure and Broadband Emission from Tycho's SNR

    E-Print Network [OSTI]

    Slane, P; Ellison, D C; Patnaude, D J; Hughes, J P; Eriksen, K A; Castro, D; Nagataki, S

    2014-01-01T23:59:59.000Z

    Tycho's supernova remnant (SNR) is well-established as a source of particle acceleration to very high energies. Constraints from numerous studies indicate that the observed gamma-ray emission results primarily from hadronic processes, providing direct evidence of highly relativistic ions that have been accelerated by the SNR. Here we present an investigation of the dynamical and spectral evolution of Tycho's SNR by carrying out hydrodynamical simulations that include diffusive shock acceleration of particles in the amplified magnetic field at the forward shock of the SNR. Our simulations provide a consistent view of the shock positions, the nonthermal emission, the thermal X-ray emission from the forward shock, and the brightness profiles of the radio and X-ray emission. We compare these with the observed properties of Tycho to determine the density of the ambient material, the particle acceleration efficiency and maximum energy, the accelerated electron to-proton ratio, and the properties of the shocked gas ...

  15. Broadband coherent light generation in Raman-active crystals driven by femtosecond laser fields

    E-Print Network [OSTI]

    Zhi, Miaochan

    2009-05-15T23:59:59.000Z

    -Stokes scattering (CARS) which is used as a tool for detecting dipicolinic acid, the marker molecule for bacterial spores. I observed that there is a maximum when the concentration dependence of the near-resonant CARS signal is measured. I presented a model...

  16. Mapping daily snow//ice shortwave broadband albedo from Moderate Resolution Imaging Spectroradiometer (MODIS): The improved

    E-Print Network [OSTI]

    Liang, Shunlin

    and global energy balances when snow coverage is variable. In the polar regions, the high surface albedo acts the Advanced Very High Resolution Radiometer (AVHRR) satellite data in polar regions [De Abreu et al., 1994 variable in surface energy balance calculations. The Moderate Resolution Imaging Spectroradiometer (MODIS

  17. Envelope amplifier for broadband base-station envelope tracking power amplifier

    E-Print Network [OSTI]

    Zhu, Qiuyao

    2011-01-01T23:59:59.000Z

    represents total power loss inside the envelope ampli?er.simulator can simulate the power loss by extracting andThere are three main power losses inside the envelope ampli?

  18. Special Issue on Broadband Wireless Networking Published online: 23 May 2006

    E-Print Network [OSTI]

    Shen, Xuemin "Sherman"

    efficiently and flexibly create new services and business models based on the component-based architecture-based wireless/wired Interworking,'' Cheng et al. discuss efficient resource allocation techniques for a policy Science + Business Media, LLC 2006 Wireless communication revolution has made funda- mental changes

  19. Thermal Modeling and Experimental Validation of Human Hair and Skin Heated by Broadband Light

    E-Print Network [OSTI]

    Aguilar, Guillermo

    distribution within the hair follicle is highly non-uniform: the minimum temperature occurs at the follicle Sun, PhD,1 Alex Chaney,1 Robert Anderson, PhD,2 and Guillermo Aguilar, PhD 1 * 1 Department:(a)determinetheoveralleffectofPPxonskinhumidi- tyandassociatedskinopticalproperties,and;(b)developaPT numerical model to study the spatial and temporal hair and skin temperature

  20. Broadband Single-Shot Electron Spectrometer for GeV-Class Laser Plasma Based Accelerators

    E-Print Network [OSTI]

    Nakamura, K.

    2008-01-01T23:59:59.000Z

    2 mrad 1 mrad kinetic enrgy [MeV] FIG. 3: (Color online)4 mrad 8 mrad Kinetic enrgy [MeV] -4 mrad -8 mrad FIG. 4:

  1. Broadband Carbon-13 Correlation Spectra of Microcrystalline Proteins in Very High Magnetic Fields

    E-Print Network [OSTI]

    avoiding excessive sample heating. This opens up new possibilities for efficient dipolar recoupling. Both aliphatic nuclei with closely spaced chemical shifts and spectrally remote nuclei give rise

  2. Integrated Ultra-Low-Loss 4-Bit Tunable Delay for Broadband Phased Array Antenna Applications

    E-Print Network [OSTI]

    2013-01-01T23:59:59.000Z

    F. Bauters, et al. , “Ultra-low-loss high-aspect-ratio Si3N4JUNE 15, 2013 Integrated Ultra-Low-Loss 4-Bit Tunable Delaya 4-bit tunable delay in an ultra-low-loss Si 3 N 4 planar

  3. A low power, high dynamic-range, broadband variable gain amplifier for an ultra wideband receiver 

    E-Print Network [OSTI]

    Chen, Lin

    2007-09-17T23:59:59.000Z

    is designed for high frequency and low power communication applications, such as an Ultra Wideband (UWB) receiver system. The gain can be programmed from 0dB to 42dB in 2dB increments with -3dB bandwidth greater than 425MHz for the entire range of gain. The 3...

  4. average clear-sky broadband: Topics by E-print Network

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

    brightness, clear-sky radiance, digital image analysis, atmospheric optics from solar energy engineering2 ,3 to atmospheric optics4'5 have repeatedly measured and modeled Lee Jr.,...

  5. Re: NBP RFI-Implementing the National Broadband Plan by Empowering...

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

    interaction with the grid will vary significantly by individual, the secure provision of energy consumption and pricing data to customers, utilities, and third parties will be...

  6. Ultra-broadband polarisers based on metastable free-standing aligned carbon nanotube membranes

    E-Print Network [OSTI]

    Cole, Matthew T.; Doherty, Matthew; Parmee, Richard; Dawson, Paul; Milne, William I.

    2014-07-24T23:59:59.000Z

    similar methodology as proposed by [32]). Equation (1) increases linearly with L and sub-linearly with PD. The negative prefactor denotes attraction. The functions ( )f ? and ( , , )g ? ? ? signify Coulombic and entropic contributions, respectively... , T, spectra as a function of ? at 2.2 mm, 15.0 ?m, and 550 nm. All T(?) plots clearly reproduce the Malus’ law (A+Bcos2?), where A and B are empirically determined constants which are intimately related the fine features of the membrane. The inserts...

  7. Silicon nanowire phototransistor : designing, fabricating and characterizing a high responsibility, broadband photodetector

    E-Print Network [OSTI]

    Zhang, Arthur Yasheng

    2010-01-01T23:59:59.000Z

    films. ITO (200 nm), and polyimide PI- 2611 (4 |am cured atfailure rate. Next, polyimide PI-2611 was investigated. Thisan acceptable value. The polyimide however demonstrates a

  8. Dynamic ResourceAllocation with a Soft Handover Procedurefor Application in a Broadband System

    E-Print Network [OSTI]

    Di Benedetto, Maria-Gabriella

    (HHO), in terms of packet loss and time delay, and its performance approaches that of the fixed users

  9. Experimental estimations of viscoelastic properties of multilayer damped plates in broad-band frequency range

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    lightweighting structures for aeronautics, automotive or construction applications, the level of performance's modulus) of "polyethylene thermoplastic / aluminum" bilayer plates. The thermoplastic is chosen for its and manufacture Each plate is constituted of a first layer in aluminum (of thickness 2mm), on which a second layer

  10. A MODEL FOR PRODUCING STABLE, BROADBAND TERAHERTZ COHERENT SYNCHROTRON RADIATION IN STORAGE RINGS*

    E-Print Network [OSTI]

    that steady state CSR has been observed for the first time in the BESSY-II storage ring [2, 3]. Coupled be found that the BESSY-II CSR emission belongs to this category. In fact, streak camera measurements for Gaussian bunches and indicating the presence of distorted distributions. Attractive features of the BESSY

  11. BROADBAND, TIME-DEPENDENT, SPECTROSCOPY OF THE BRIGHTEST BURSTS OBSERVED BY BATSE LAD AND EGRET TASC

    SciTech Connect (OSTI)

    Gonzalez, M. M.; Carrillo-Barragan, M. [Instituto de AstronomIa, Universidad Nacional Autonoma de Mexico, Mexico 04510 (Mexico); Dingus, B. L. [Los Alamos National Laboratory, Los Alamos, NM 87545 (United States); Kaneko, Y. [Universities Space Research Association, NSSTC, Huntsville, AL 35805 (United States); Preece, R. D.; Briggs, M. S. [Physics Department, University of Alabama, Huntsville, AL 35899 (United States)

    2009-05-10T23:59:59.000Z

    The Energetic Gamma Ray Experiment Telescope (EGRET) calorimeter, Total Absorption Shower Counter (TASC), was triggered by the Burst And Transient Source Experiment (BATSE) and thus observed several bursts in the energy range of 1-200 MeV. The analysis of combined BATSE Large Area Detector and EGRET TASC data have been developed and discussed previously. Spectroscopy of GRB941017 based on this analysis uncovered an MeV component that would be hidden in the brightness of the synchrotron component in a time-integrated spectrum of the whole burst, while separation into shorter time intervals allowed a unique identification of a new component different from the synchrotron component. In this paper the spectral temporal evolution of the 68 brightest long BATSE bursts, in the broadest energy range yet reported, is studied using the analysis used for GRB941017. We consider the Band function to describe the spectra from keV to MeV energies. Only 21 of the 68 bursts showed MeV emission detectable by TASC. We observed three bursts that contained spectra with peak energy E {sub peak}>2 MeV.

  12. Relationship between environment and the broad-band optical properties of galaxies in the SDSS

    E-Print Network [OSTI]

    M. R. Blanton; D. J. Eisenstein; D. W. Hogg; D. J. Schlegel; J. Brinkmann

    2003-10-16T23:59:59.000Z

    We examine the relationship between environment and the luminosities, surface brightnesses, colors, and profile shapes of luminous galaxies in the Sloan Digital Sky Survey (SDSS). For the SDSS sample, galaxy color is the galaxy property most predictive of the local environment. Galaxy color and luminosity jointly comprise the most predictive pair of properties. At fixed luminosity and color, density is not closely related to surface brightness or to Sersic index -- the parameter in this study that astronomers most often associate with morphology. In the text, we discuss what measureable residual relationships exist, generally finding that at red colors and fixed luminosity, the mean density decreases at the highest surface brightnesses and Sersic indices. In general, these results suggest that the morphological properties of galaxies are less closely related to galaxy environment than are their masses and star-formation histories.

  13. A low power, high dynamic-range, broadband variable gain amplifier for an ultra wideband receiver

    E-Print Network [OSTI]

    Chen, Lin

    2007-09-17T23:59:59.000Z

    gain steps. The gain control scheme includes fine tuning (2dB/step) by changing the bias voltage of the proposed programmable current mirror, and coarse tuning (14dB/step) by switching on/off the source degeneration resistors in the differential pairs...

  14. Digital Signal Processing using Stream High Performance Computing: A 512-input Broadband Correlator for Radio Astronomy

    E-Print Network [OSTI]

    Kocz, J; Barsdell, B R; Price, D; Bernardi, G; Bourke, S; Clark, M A; Craig, J; Dexter, M; Dowell, J; Eftekhari, T; Ellingson, S; Hallinan, G; Hartman, J; Jameson, A; MacMahon, D; Taylor, G; Schinzel, F; Werthimer, D

    2014-01-01T23:59:59.000Z

    A "large-N" correlator that makes use of Field Programmable Gate Arrays and Graphics Processing Units has been deployed as the digital signal processing system for the Long Wavelength Array station at Owens Valley Radio Observatory (LWA-OV), to enable the Large Aperture Experiment to Detect the Dark Ages (LEDA). The system samples a ~100MHz baseband and processes signals from 512 antennas (256 dual polarization) over a ~58MHz instantaneous sub-band, achieving 16.8Tops/s and 0.236 Tbit/s throughput in a 9kW envelope and single rack footprint. The output data rate is 260MB/s for 9 second time averaging of cross-power and 1 second averaging of total-power data. At deployment, the LWA-OV correlator was the largest in production in terms of N and is the third largest in terms of complex multiply accumulations, after the Very Large Array and Atacama Large Millimeter Array. The correlator's comparatively fast development time and low cost establish a practical foundation for the scalability of a modular, heterogeneo...

  15. LPTV-Aware Bit Loading and Channel Estimation in Broadband PLC for Smart Grid

    E-Print Network [OSTI]

    Tunc, Muharrem Ali

    2014-05-31T23:59:59.000Z

    Power line communication (PLC) has received steady interest over recent decades because of its economic use of existing power lines, and is one of the communication technologies envisaged for Smart Grid (SG) infrastructure. However, power lines...

  16. Stix: a goal-oriented distributed management system for large-scale broadband wireless access networks 

    E-Print Network [OSTI]

    Bernardi, Giacomo; Calder, Matt; Fenacci, Damon; Macmillan, Alexander; Marina, Mahesh

    2010-10-25T23:59:59.000Z

    management infrastructure scalable and flexible. Stix is based on the notions of goal-oriented and in-network management. With Stix, administrators graphically specify network management activities as workflows, which are deployed at a distributed set...

  17. Broadband Sharp 90-degree Bends and TSplitters in Plasmonic Coaxial Waveguides

    E-Print Network [OSTI]

    Fan, Shanhui

    % when bent sharply by 90° for near-infrared wavelengths.12 The reflection can be suppressed by rounding-subwavelength scale to operate without reflection and radiation over a broad range of wavelengths, including and split input power almost perfectly without introducing additional reflection and radiation loss on top

  18. Two-dimensional stimulated resonance Raman spectroscopy of molecules with broadband x-ray pulses

    SciTech Connect (OSTI)

    Biggs, Jason D.; Zhang Yu; Healion, Daniel; Mukamel, Shaul [Department of Chemistry, University of California, Irvine, California 92697-2025 (United States)

    2012-05-07T23:59:59.000Z

    Expressions for the two-dimensional stimulated x-ray Raman spectroscopy (2D-SXRS) signal obtained using attosecond x-ray pulses are derived. The 1D- and 2D-SXRS signals are calculated for trans-N-methyl acetamide (NMA) with broad bandwidth (181 as, 14.2 eV FWHM) pulses tuned to the oxygen and nitrogen K-edges. Crosspeaks in 2D signals reveal electronic Franck-Condon overlaps between valence orbitals and relaxed orbitals in the presence of the core-hole.

  19. Broadband very low frequency measurement of D region ionospheric perturbations caused by lightning electromagnetic pulses

    E-Print Network [OSTI]

    Cummer, Steven A.

    strokes that do and do not generate detectable ionospheric perturbations. Citation: Cheng, Z., S. A electromagnetic pulses Zhenggang Cheng,1 Steven A. Cummer,1 Han-Tzong Su,2 and Rue-Ron Hsu2 Received 10 May 2006

  20. Broadband and omnidirectional anti-reflection layer for III/V multi-junction solar cells

    E-Print Network [OSTI]

    Diedenhofen, Silke L; Haverkamp, Erik; Bauhuis, Gerard; Schermer, John; Rivas, Jaime Gómez; 10.1016/j.solmat.2012.02.022

    2012-01-01T23:59:59.000Z

    We report a novel graded refractive index antireflection coating for III/V quadruple solar cells based on bottom-up grown tapered GaP nanowires. We have calculated the photocurrent density of an InGaP-GaAs-InGaAsP-InGaAs solar cell with a MgF2/ZnS double layer antireflection coating and with a graded refractive index coating. The photocurrent density can be increased by 5.9 % when the solar cell is coated with a graded refractive index layer with a thickness of 1\\mu m. We propose to realize such a graded refractive index layer by growing tapered GaP nanowires on III/V solar cells. For a first demonstration of the feasibility of the growth of tapered nanowires on III/V solar cells, we have grown tapered GaP nanowires on AlInP/GaAs substrates. We show experimentally that the reflection from the nanowire coated substrate is reduced and that the transmission into the substrate is increased for a broad spectral and angular range.

  1. Integrating end-to-end encryption and authentication technology into broadband networks

    SciTech Connect (OSTI)

    Pierson, L.G.

    1995-11-01T23:59:59.000Z

    BISDN services will involve the integration of high speed data, voice, and video functionality delivered via technology similar to Asynchronous Transfer Mode (ATM) switching and SONET optical transmission systems. Customers of BISDN services may need a variety of data authenticity and privacy assurances, via Asynchronous Transfer Mode (ATM) services Cryptographic methods can be used to assure authenticity and privacy, but are hard to scale for implementation at high speed. The incorporation of these methods into computer networks can severely impact functionality, reliability, and performance. While there are many design issues associated with the serving of public keys for authenticated signaling and for establishment of session cryptovariables, this paper is concerned with the impact of encryption itself on such communications once the signaling and setup have been completed. Network security protections should be carefully matched to the threats against which protection is desired. Even after eliminating unnecessary protections, the remaining customer-required network security protections can impose severe performance penalties. These penalties (further discussed below) usually involve increased communication processing for authentication or encryption, increased error rate, increased communication delay, and decreased reliability/availability. Protection measures involving encryption should be carefully engineered so as to impose the least performance, reliability, and functionality penalties, while achieving the required security protection. To study these trade-offs, a prototype encryptor/decryptor was developed. This effort demonstrated the viability of implementing certain encryption techniques in high speed networks. The research prototype processes ATM cells in a SONET OC-3 payload. This paper describes the functionality, reliability, security, and performance design trade-offs investigated with the prototype.

  2. THE JOURNAL OF CHEMICAL PHYSICS 139, 124113 (2013) Time-resolved broadband Raman spectroscopies: A unified

    E-Print Network [OSTI]

    Mukamel, Shaul

    2013-01-01T23:59:59.000Z

    be defined as a change of the energy of the electromagnetic field S = - dt d dt a i (t)ai(t) = I 2 ¯ - dt and frequency resolved Raman techniques have been developed towards monitoring ex- cited and ground state the system with pulse Ej and deex- cites it with E i . We use complex pulse amplitudes. The elec- tronically

  3. Broadband and statistical characterization of echoes from random scatterers : application to acoustic scattering by marine organisms

    E-Print Network [OSTI]

    Lee, Wu-Jung

    2013-01-01T23:59:59.000Z

    The interpretation of echoes collected by active remote-sensing systems, such as sonar and radar, is often ambiguous due to the complexities in the scattering processes involving the scatterers, the environment, and the ...

  4. Complex Faraday depth structure of Active Galactic Nuclei as revealed by broadband radio polarimetry

    E-Print Network [OSTI]

    O'Sullivan, S P; Robishaw, T; Schnitzeler, D H F M; McClure-Griffiths, N M; Feain, I J; Taylor, A R; Gaensler, B M; Landecker, T L; Harvey-Smith, L; Carretti, E

    2012-01-01T23:59:59.000Z

    We present a detailed study of the Faraday depth structure of four bright (> 1 Jy), strongly polarized, unresolved, radio-loud quasars. The Australia Telescope Compact Array (ATCA) was used to observe these sources with 2 GHz of instantaneous bandwidth from 1.1 to 3.1 GHz. This allowed us to spectrally resolve the polarization structure of spatially unresolved radio sources, and by fitting various Faraday rotation models to the data, we conclusively demonstrate that two of the sources cannot be described by a simple rotation measure (RM) component modified by depolarization from a foreground Faraday screen. Our results have important implications for using background extragalactic radio sources as probes of the galactic and intergalactic magneto-ionic media as we show how RM estimations from narrow-bandwidth observations can give erroneous results in the presence of multiple interfering Faraday components. We postulate that the additional RM components arise from polarized structure in the compact inner regio...

  5. Big data and insatiable consumer demand for broadband are driving a new generation of intelligent,

    E-Print Network [OSTI]

    Shepard, Kenneth

    of intelligent, programmable, energy efficient networks--powered by optical switching--to support Internet step further, forming a fiber-to-the-home/premises/curb network. In sum, fiber is no longer solely

  6. A broadband and high-gain metamaterial microstrip antenna Le-Wei Li,1,a

    E-Print Network [OSTI]

    Floreano, Dario

    printed antennas in practice. It enjoys its advantages of low profile, simple structure, low cost refractions, there was still little progress toward practical applications.18 At microwave frequencies and fabrications, and b absorbing ma- terials for engineering and radar applications. For example, split ring

  7. Progress In Electromagnetics Research B, Vol. 40, 241260, 2012 A COMPACT COPLANAR BROADBAND RECTANGU-

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    because they offer many advantages such as compact size, low-cost, ease of fabrication, light weight nearly half of the spectrum covers frequencies lower than 1 GHz. A partial shield, only opened towards

  8. Laser triggered Z-pinch broadband extreme ultraviolet source for metrology

    SciTech Connect (OSTI)

    Tobin, I.; Lunney, J. G. [School of Physics, Trinity College Dublin, Dublin 2 (Ireland)] [School of Physics, Trinity College Dublin, Dublin 2 (Ireland); Juschkin, L. [School of Physics, University College Dublin, Belfield, Dublin 4 (Ireland) [School of Physics, University College Dublin, Belfield, Dublin 4 (Ireland); Department of Physics, RWTH Aachen University, Steinbachstr. 15 D-52074 Aachen (Germany); Sidelnikov, Y. [ISAN Institute of Spectroscopy, Fizicheskaya Str. 5, Troitsk, Moscow Region 142190 (Russian Federation)] [ISAN Institute of Spectroscopy, Fizicheskaya Str. 5, Troitsk, Moscow Region 142190 (Russian Federation); O'Reilly, F.; Sokell, E. [School of Physics, University College Dublin, Belfield, Dublin 4 (Ireland)] [School of Physics, University College Dublin, Belfield, Dublin 4 (Ireland); Sheridan, P. [Newlambda Technologies, UCD Science Centre North, Belfield, Dublin 4 (Ireland)] [Newlambda Technologies, UCD Science Centre North, Belfield, Dublin 4 (Ireland)

    2013-05-20T23:59:59.000Z

    We compare the extreme ultraviolet emission characteristics of tin and galinstan (atomic %: Ga: 78.35, In: 14.93, Sn: 6.72) between 10 nm and 18 nm in a laser-triggered discharge between liquid metal-coated electrodes. Over this wavelength range, the energy conversion efficiency for galinstan is approximately half that of tin, but the spectrum is less strongly peaked in the 13-15 nm region. The extreme ultraviolet source dimensions were 110 {+-} 25 {mu}m diameter and 500 {+-} 125 {mu}m length. The flatter spectrum, and -19 Degree-Sign C melting point, makes this galinstan discharge a relatively simple high radiance extreme ultraviolet light source for metrology and scientific applications.

  9. Efficient THz lasers and broadband amplifiers based on quantum cascade gain media

    E-Print Network [OSTI]

    Cai, Xiaowei, S.M. Massachusetts Institute of Technology

    2014-01-01T23:59:59.000Z

    One of the most important applications for Terahertz (THz) quantum cascade (QC) lasers is to provide compact and powerful frequency-stabilized solid-state sources as local oscillators in heterodyne receivers for astronomical ...

  10. High-Voltage Broadband-Over-Powerline (HV-BPL) Field Test Report | Open

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand Jump to: navigation, search OpenEIHesperia, California: Energy Resources JumpSheldon EnergyEnergy

  11. DOE Takes Steps to Implement the National Broadband Plan | Department of

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn't Your Destiny: Theof"WaveInteractions andDefinitionEnergy Implement the National

  12. Re: NBP RFI-Implementing the National Broadband Plan by Empowering

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOn April 23, 2014, an OHASeptember 2010In addition to 1 |DDOERue,Consumers and the Smart

  13. Re: NBP RFI-Implementing the National Broadband Plan by Studying the

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742EnergyOn April 23, 2014, an OHASeptember 2010In addition to 1 |DDOERue,Consumers and the

  14. A Simple Empirical Equation to Calculate Cloud Optical Thickness from Shortwave Broadband Measurements

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of ScienceandMesa del(ANL-IN-03-032) -Less isNFebruaryOctober 2, AlgeriaQ1A Month toAAA

  15. Recent Developments on the Broadband Heating Rate Profile Value-Added Product

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's PossibleRadiation Protection Radiation ProtectionRaising fundsRealPrintingRecap:

  16. Assessing regional scale predictions of aerosols, marine stratocumulus, and their interactions during VOCALS-REx using WRF-Chem

    SciTech Connect (OSTI)

    Yang, Qing; Gustafson, William I.; Fast, Jerome D.; Wang, Hailong; Easter, Richard C.; Morrison, H.; Lee, Y.- N.; Chapman, Elaine G.; Spak, S. N.; Mena-Carrasco, M. A.

    2011-12-02T23:59:59.000Z

    In the recent chemistry version (v3.3) of the Weather Research and Forecasting (WRF-Chem) model, we have coupled the Morrison double-moment microphysics scheme with interactive aerosols so that full two-way aerosol-cloud interactions are included in simulations. We have used this new WRF-Chem functionality in a study focused on assessing predictions of aerosols, marine stratocumulus clouds, and their interactions over the Southeast Pacific using measurements from the VAMOS Ocean-Cloud-Atmosphere-Land Study Regional Experiment (VOCALS-REx) and satellite retrievals. This study also serves as a detailed analysis of our WRF-Chem simulations contributed to the VOCALS model Assessment (VOCA) project. The WRF-Chem 31-day (October 15-November 16, 2008) simulation with aerosol-cloud interactions (AERO hereafter) is also compared to a simulation (MET hereafter) with fixed cloud droplet number concentrations assumed by the default in Morrison microphysics scheme with no interactive aerosols. The well-predicted aerosol properties such as number, mass composition, and optical depth lead to significant improvements in many features of the predicted stratocumulus clouds: cloud optical properties and microphysical properties such as cloud top effective radius, cloud water path, and cloud optical thickness, and cloud macrostructure such as cloud depth and cloud base height. These improvements in addition to the aerosol direct and semi-direct effects, in turn, feed back to the prediction of boundary-layer characteristics and energy budgets. Particularly, inclusion of interactive aerosols in AERO strengths temperature and humidity gradients within capping inversion layer and lowers the MBL depth by 150 m from that of the MET simulation. Mean top-of-the-atmosphere outgoing shortwave fluxes, surface latent heat, and surface downwelling longwave fluxes are in better agreement with observations in AERO, compared to the MET simulation. Nevertheless, biases in some of the simulated meteorological quantities (e.g., MBL temperature and humidity over the remote ocean) and aerosol quantities (e.g., overestimations of supermicron sea salt mass) might affect simulated stratocumulus and energy fluxes over the SEP, and require further investigations. Although not perfect, the overall performance of the regional model in simulating mesoscale aerosol-cloud interactions is encouraging and suggests that the inclusion of spatially varying aerosol characteristics is important when simulating marine stratocumulus over the southeastern Pacific.

  17. Assessing regional scale predictions of aerosols, marine stratocumulus, and their interactions during VOCALS-REx using WRF-Chem

    SciTech Connect (OSTI)

    Yang Q.; Lee Y.; Gustafson Jr., W. I.; Fast, J. D.; Wang, H.; Easter, R. C.; Morrison, H.; Chapman, E. G.; Spak, S. N.; Mena-Carrasco, M. A.

    2011-12-02T23:59:59.000Z

    This study assesses the ability of the recent chemistry version (v3.3) of the Weather Research and Forecasting (WRF-Chem) model to simulate boundary layer structure, aerosols, stratocumulus clouds, and energy fluxes over the Southeast Pacific Ocean. Measurements from the VAMOS Ocean-Cloud-Atmosphere-Land Study Regional Experiment (VOCALS-REx) and satellite retrievals (i.e., products from the MODerate resolution Imaging Spectroradiometer (MODIS), Clouds and Earth's Radiant Energy System (CERES), and GOES-10) are used for this assessment. The Morrison double-moment microphysics scheme is newly coupled with interactive aerosols in the model. The 31-day (15 October-16 November 2008) WRF-Chem simulation with aerosol-cloud interactions (AERO hereafter) is also compared to a simulation (MET hereafter) with fixed cloud droplet number concentrations in the microphysics scheme and simplified cloud and aerosol treatments in the radiation scheme. The well-simulated aerosol quantities (aerosol number, mass composition and optical properties), and the inclusion of full aerosol-cloud couplings lead to significant improvements in many features of the simulated stratocumulus clouds: cloud optical properties and microphysical properties such as cloud top effective radius, cloud water path, and cloud optical thickness. In addition to accounting for the aerosol direct and semi-direct effects, these improvements feed back to the simulation of boundary-layer characteristics and energy budgets. Particularly, inclusion of interactive aerosols in AERO strengthens the temperature and humidity gradients within the capping inversion layer and lowers the marine boundary layer (MBL) depth by 130 m from that of the MET simulation. These differences are associated with weaker entrainment and stronger mean subsidence at the top of the MBL in AERO. Mean top-of-atmosphere outgoing shortwave fluxes, surface latent heat, and surface downwelling longwave fluxes are in better agreement with observations in AERO, compared to the MET simulation. Nevertheless, biases in some of the simulated meteorological quantities (e.g., MBL temperature and humidity) and aerosol quantities (e.g., underestimations of accumulation mode aerosol number) might affect simulated stratocumulus and energy fluxes over the Southeastern Pacific, and require further investigation. The well-simulated timing and outflow patterns of polluted and clean episodes demonstrate the model's ability to capture daily/synoptic scale variations of aerosol and cloud properties, and suggest that the model is suitable for studying atmospheric processes associated with pollution outflow over the ocean. The overall performance of the regional model in simulating mesoscale clouds and boundary layer properties is encouraging and suggests that reproducing gradients of aerosol and cloud droplet concentrations and coupling cloud-aerosol-radiation processes are important when simulating marine stratocumulus over the Southeast Pacific.

  18. Critical Mechanisms for the Formation of Extreme Arctic Sea-Ice Extent in the Summers of 2007 and 1996

    SciTech Connect (OSTI)

    Dong, Xiquan; Zib, Benjamin J.; Xi, Baike; Stanfield, Ryan; Deng, Yi; Zhang, Xiangdong; Lin, B.; Long, Charles N.

    2014-07-29T23:59:59.000Z

    A warming Arctic climate is undergoing significant e 21 nvironmental change, most evidenced by the reduction of Arctic sea-ice extent during the summer. In this study, we examine two extreme anomalies of September sea-ice extent in 2007 and 1996, and investigate the impacts of cloud fraction (CF), atmospheric precipitable water vapor (PWV), downwelling longwave flux (DLF), surface air temperature (SAT), pressure and winds on the sea-ice variation in 2007 and 1996 using both satellite-derived sea-ice products and MERRA reanalysis. The area of the Laptev, East Siberian and West Chukchi seas (70-90oN, 90-180oE) has experienced the largest variation in sea-ice extent from year-to-year and defined here as the Area Of Focus (AOF). The record low September sea-ice extent in 2007 was associated with positive anomalies 30 of CF, PWV, DLF, and SAT over the AOF. Persistent anti-cyclone positioned over the Beaufort Sea coupled with low pressure over Eurasia induced easterly zonal and southerly meridional winds. In contrast, negative CF, PWV, DLF and SAT anomalies, as well as opposite wind patterns to those in 2007, characterized the 1996 high September sea-ice extent. Through this study, we hypothesize the following positive feedbacks of clouds, water vapor, radiation and atmospheric variables on the sea-ice retreat during the summer 2007. The record low sea-ice extent during the summer 2007 is initially triggered by the atmospheric circulation anomaly. The southerly winds across the Chukchi and East Siberian seas transport warm, moist air from the north Pacific, which is not only enhancing sea-ice melt across the AOF, but also increasing clouds. The positive cloud feedback results in higher SAT and more sea-ice melt. Therefore, 40 more water vapor could be evaporated from open seas and higher SAT to form more clouds, which will enhance positive cloud feedback. This enhanced positive cloud feedback will then further increase SAT and accelerate the sea-ice retreat during the summer 2007.

  19. MPO 502-03 OCEANOGRAPHY 2 (PHYSICAL) Fall Semester 2012

    E-Print Network [OSTI]

    Miami, University of

    and Other Long Waves 23) Nov. 12 Surface Gravity Waves 24) Nov. 14 Waves, Beaches and Coastal Processes 25) Oct. 31 Geostrophic Motion 21) Nov. 5 Ekman Layers and Upwelling or Downwelling 22) Nov. 7 Tides

  20. all-ceramic layer structures: Topics by E-print Network

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

    Forties, Nice, France, January 2009 12;Overview Background and motivation. Long-wave model for longitudinal waves in a waveguide: nonlinear elasticity approach and lattice...

  1. Improvement of snowpack simulations in a regional climate model

    E-Print Network [OSTI]

    Jin, J.

    2012-01-01T23:59:59.000Z

    that intensifies the solar radiation absorption on the landulate and predict the solar radiation budget at the sur-SW # the downward solar radiation, LWNET the net longwave

  2. Intercomparison of model simulations of mixed-phase clouds observed during the ARM Mixed-Phase Arctic Cloud Experiment. Part I: Single layer cloud

    E-Print Network [OSTI]

    Klein, Stephen A.

    2009-01-01T23:59:59.000Z

    cloud has the correct effect on surface fluxes of radiation.radiation is 200 W m –2 in clear-sky STREAMER calculations, the longwave cloud radiative effect

  3. Sperry Low Temperature Geothermal Conversion System, Phase I and Phase II. Volume V. Component development. Final report

    SciTech Connect (OSTI)

    Harvey, C.; McBee, W.; Matthews, H.B.

    1984-01-01T23:59:59.000Z

    The fundamental inventions which motivate this program are system concepts centered on a novel heat engine cycle and the use of downwell heat exchange. Here, the primary emphasis is on downwell hardware. The only surface equipment included is the surface portion of the instrumentation and control systems. Downwell instrumentation is reported. Downwell conduits and techniques for installing, connecting and sealing them are covered. The downwell turbine-pump unit (TPU) is a critical component since it is relatively inaccessible and operates in a hostile environment. Its development is reported. The TPU for the gravity-head system requires a different type of turbine because of the large flow-rate through it and the small pressure difference across it. The design study for a Francis turbine to meet these requirements is reported. A feature of these systems is use of a downwell heat exchanger. There were extensive studies of tube-bundle configuration, tube-sheet seals, structural integrity, and flow and heat transfer, as well as the research on welded connections and sliding elastomeric seals. Another innovative component in these systems is the enthalpy recovery unit (ERU). This direct-contact heat exchanger compensates for under-cooling in the condenser and superheat in the main turbine exhaust.

  4. Broadband Wireless Internet Access in Public Transportation1 Andreas Roos, University of Applied Sciences Leipzig, 04277 Leipzig, Germany

    E-Print Network [OSTI]

    Rakocevic, Veselin

    Sciences Leipzig, 04277 Leipzig, Germany Nico Bayer, University of Applied Sciences Friedberg, 61169 Friedberg, Germany Dmitry Sivchenko, University of Applied Sciences Friedberg, 61169 Friedberg, Germany Michael Flegl, University of Applied Sciences Leipzig, 04277 Leipzig, Germany Profn. Dr. Sabine Wieland

  5. Optical Design of a Broadband Infrared Spectrometer for Bunch Length Measurement at the Linac Coherent Light Source

    SciTech Connect (OSTI)

    Williams, Kiel; /SLAC

    2012-09-07T23:59:59.000Z

    The electron pulses generated by the Linac Coherent Light Source at the SLAC National Accelerator Laboratory occur on the order of tens of femtoseconds and cannot be directly measured by conventional means. The length of the pulses can instead be reconstructed by measuring the spectrum of optical transition radiation emitted by the electrons as they move toward a conducting foil. Because the emitted radiation occurs in the mid-infrared from 0.6 to 30 microns a novel optical layout is required. Using a helium-neon laser with wavelength 633 nm, a series of gold-coated off-axis parabolic mirrors were positioned to direct a beam through a zinc selenide prism and to a focus at a CCD camera for imaging. Constructing this layout revealed a number of novel techniques for reducing the aberrations introduced into the system by the off-axis parabolic mirrors. The beam had a recorded radius of less than a millimeter at its final focus on the CCD imager. This preliminary setup serves as a model for the spectrometer that will ultimately measure the LCLS electron pulse duration.

  6. WiFiRe: Rural Area Broadband Access using the WiFi PHY and a Multisector TDD MAC

    E-Print Network [OSTI]

    Kumar, Anurag

    expenditure (capex) on the access network to sustainable monthly revenue per user in India is currently less than 12. If we use the same factor, the capex per kiosk can be at most US$ 300, and this would include

  7. Zinc Oxide Nanowire As an Electron-Extraction Layer for Broadband Polymer Photodetectors with an Inverted Device Structure

    E-Print Network [OSTI]

    Wang, Deli

    to be unstable with indium, contaminating the polymer and thus degrading the performance of devices. MeanwhileOx) and cesium carbonate (Cs2CO3) are developed onto the ITO electrode to break the symmetry. The elimination

  8. IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 58, NO. 5, MAY 2010 1273 Automated Broadband High-Dynamic-Range

    E-Print Network [OSTI]

    , the dynamic range is 106 dB, limited by carrier phase noise. A single-tone cancellation formula is developed with respect to system linearity. Feedforward cancellation and consideration of electro- magnetic radiation coupling and reverse-wave isolation effects extends the dynamic range of spectrum and vector analyzers

  9. THE CHANDRA MULTI-WAVELENGTH PROJECT: OPTICAL SPECTROSCOPY AND THE BROADBAND SPECTRAL ENERGY DISTRIBUTIONS OF X-RAY-SELECTED AGNs

    E-Print Network [OSTI]

    Trichas, Markos

    From optical spectroscopy of X-ray sources observed as part of the Chandra Multi-wavelength Project (ChaMP), we present redshifts and classifications for a total of 1569 Chandra sources from our targeted spectroscopic ...

  10. A 19-GHz Broadband Amplifier Using a gm-Boosted Cascode in 0.18-m CMOS

    E-Print Network [OSTI]

    Chan Carusone, Tony

    by the time constants associated with the three nodes' parasitic capacitances: CIN, CX, and COUT. The input at this node [8]. CO U T CIN CX M1 M2 RL CO U T CIN CX M1 M2 CIN CX M1 M2 RL VB1 VOUT (a) M1 M2 L4 L1 VX C RL L of M2, approximately CX/gm2. Inserting inductor L2 in Fig. 1(b) separates the drain capac- itance of M1

  11. A CR-HYDRO-NEI MODEL OF THE STRUCTURE AND BROADBAND EMISSION FROM TYCHO’S SUPERNOVA REMNANT

    E-Print Network [OSTI]

    Slane, P.

    Tycho's supernova remnant (SNR) is well-established as a source of particle acceleration to very high energies. Constraints from numerous studies indicate that the observed ?-ray emission results primarily from hadronic ...

  12. Broadband infrared and Raman probes of excited-state vibrational molecular dynamics; Simulation protocols based on loop diagram

    E-Print Network [OSTI]

    Konstantin E. Dorfman; Benjamin P. Fingerhut; Shaul Mukamel

    2013-05-23T23:59:59.000Z

    Vibrational motions in electronically excited states can be observed by either time and frequency resolved infrared absorption or by off resonant stimulated Raman techniques. Multipoint correlation function expressions are derived for both signals. Three representations for the signal which suggest different simulation protocols are developed. These are based on the forward and the backward propagation of the wavefunction, sum over state expansion using an effective vibration Hamiltonian and a semiclassical treatment of a bath. We show that the effective temporal ($\\Delta t$) and spectral ($\\Delta\\omega$) resolution of the techniques is not controlled solely by experimental knobs but also depends on the system dynamics being probed. The Fourier uncertainty $\\Delta\\omega\\Delta t>1$ is never violated.

  13. Comparison of MODIS broadband albedo over an agricultural site with ground measurements and values derived from Earth observation

    E-Print Network [OSTI]

    Jones, Peter JS

    on the surface as well as the spectral reflectance properties of those materials i.e. BRDF V, V0 ð �~ dLe V, V0 ð � dEi V0 ð � sr{1 � Á ð1� where dLe is the incremental radiance reflected from the surface

  14. THE CHANDRA MULTI-WAVELENGTH PROJECT: OPTICAL SPECTROSCOPY AND THE BROADBAND SPECTRAL ENERGY DISTRIBUTIONS OF X-RAY-SELECTED AGNs

    SciTech Connect (OSTI)

    Trichas, Markos; Green, Paul J.; Aldcroft, Tom; Kim, Dong-Woo; Mossman, Amy [Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 (United States); Silverman, John D. [Institute for the Physics and Mathematics of the Universe (IPMU), University of Tokyo, Kashiwanoha 5-1-5, Kashiwa-shi, Chiba 277-8568 (Japan); Barkhouse, Wayne [Department of Physics and Astrophysics, University of North Dakota, Grand Forks, ND 58202 (United States); Cameron, Robert A. [W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305 (United States); Constantin, Anca [Department of Physics and Astronomy, James Madison University, PHCH, Harrisonburg, VA 22807 (United States); Ellison, Sara L. [Department of Physics and Astronomy, University of Victoria, Victoria, BC V8P 1A1 (Canada); Foltz, Craig [Division of Astronomical Sciences, National Science Foundation, 4201 Wilson Blvd., Arlington, VA 22230 (United States); Haggard, Daryl [Center for Interdisciplinary Exploration and Research in Astrophysics, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208 (United States); Jannuzi, Buell T. [NOAO, Kitt Peak National Observatory, Tucson, AZ 85726 (United States); Marshall, Herman L. [Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139 (United States); Perez, Laura M. [Department of Astronomy, California Institute of Technology, 1200 East California Blvd, Pasadena, CA 91125 (United States); Romero-Colmenero, Encarni [South African Astronomical Observatory, P.O. Box 9, Observatory, 7935 (South Africa); Ruiz, Angel [Osservatorio Astronomico di Brera-INAF, Milan (Italy); Smith, Malcolm G., E-mail: mtrichas@cfa.harvard.edu [Cerro Tololo Interamerican Observatory, La Serena (Chile); and others

    2012-06-01T23:59:59.000Z

    From optical spectroscopy of X-ray sources observed as part of the Chandra Multi-wavelength Project (ChaMP), we present redshifts and classifications for a total of 1569 Chandra sources from our targeted spectroscopic follow-up using the FLWO/1.5 m, SAAO/1.9 m, WIYN 3.5 m, CTIO/4 m, KPNO/4 m, Magellan/6.5 m, MMT/6.5 m, and Gemini/8 m telescopes, and from archival Sloan Digital Sky Survey (SDSS) spectroscopy. We classify the optical counterparts as 50% broad-line active galactic nuclei (AGNs), 16% emission line galaxies, 14% absorption line galaxies, and 20% stars. We detect QSOs out to z {approx} 5.5 and galaxies out to z {approx} 3. We have compiled extensive photometry, including X-ray (ChaMP), ultraviolet (GALEX), optical (SDSS and ChaMP-NOAO/MOSAIC follow-up), near-infrared (UKIDSS, Two Micron All Sky Survey, and ChaMP-CTIO/ISPI follow-up), mid-infrared (WISE), and radio (FIRST and NVSS) bands. Together with our spectroscopic information, this enables us to derive detailed spectral energy distributions (SEDs) for our extragalactic sources. We fit a variety of template SEDs to determine bolometric luminosities, and to constrain AGNs and starburst components where both are present. While {approx}58% of X-ray Seyferts (10{sup 42} erg s{sup -1} < L{sub 2-10keV} <10{sup 44} erg s{sup -1}) require a starburst event (>5% starburst contribution to bolometric luminosity) to fit observed photometry only 26% of the X-ray QSO (L{sub 2-10keV} >10{sup 44} erg s{sup -1}) population appear to have some kind of star formation contribution. This is significantly lower than for the Seyferts, especially if we take into account torus contamination at z > 1 where the majority of our X-ray QSOs lie. In addition, we observe a rapid drop of the percentage of starburst contribution as X-ray luminosity increases. This is consistent with the quenching of star formation by powerful QSOs, as predicted by the merger model, or with a time lag between the peak of star formation and QSO activity. We have tested the hypothesis that there should be a strong connection between X-ray obscuration and star formation but we do not find any association between X-ray column density and star formation rate both in the general population or the star-forming X-ray Seyferts. Our large compilation also allows us to report here the identification of 81 X-ray Bright Optically inactive Galaxies, 78 z > 3 X-ray sources, and eight Type-2 QSO candidates. Also, we have identified the highest redshift (z = 5.4135) X-ray-selected QSO with optical spectroscopy.

  15. Plasmonic materials based on ZnO films and their potential for developing broadband middle-infrared absorbers

    SciTech Connect (OSTI)

    Kesim, Yunus E., E-mail: yunus.kesim@bilkent.edu.tr; Battal, Enes [Department of Electrical and Electronics Engineering, Bilkent University, Ankara, 06800 (Turkey); UNAM-National Nanotechnology Research Center, Bilkent University, Ankara, 06800 (Turkey); Okyay, Ali K. [Department of Electrical and Electronics Engineering, Bilkent University, Ankara, 06800 (Turkey); UNAM-National Nanotechnology Research Center, Bilkent University, Ankara, 06800 (Turkey); Institute of Materials Science and Nanotechnology, Bilkent University, Ankara, 06800 (Turkey)

    2014-07-15T23:59:59.000Z

    Noble metals such as gold and silver have been extensively used for plasmonic applications due to their ability to support plasmons, yet they suffer from high intrinsic losses. Alternative plasmonic materials that offer low loss and tunability are desired for a new generation of efficient and agile devices. In this paper, atomic layer deposition (ALD) grown ZnO is investigated as a candidate material for plasmonic applications. Optical constants of ZnO are investigated along with figures of merit pertaining to plasmonic waveguides. We show that ZnO can alleviate the trade-off between propagation length and mode confinement width owing to tunable dielectric properties. In order to demonstrate plasmonic resonances, we simulate a grating structure and computationally demonstrate an ultra-wide-band (4–15 ?m) infrared absorber.

  16. Blazars Astroph. with BeppoSAX and other Observatories 1 Broadband Spectra and Variability of BL Lacertae in

    E-Print Network [OSTI]

    Boettcher, Markus

    Lacertae in 2000 M. B ¨ OTTCHER 1 \\Lambda\\Lambda , H. D. ALLER 2 , M. F. ALLER, 2 , O. MANG, 3 , C. M extending out to ¸ 10 keV during that time. At higher energies, the onset of the hard power­law commonly

  17. High-frequency Acoustic Recording Package (HARP) for broad-band, long-term marine mammal monitoring

    E-Print Network [OSTI]

    Wiggins, Sean M; Hildebrand, John A

    2007-01-01T23:59:59.000Z

    characteristics back to the LTSA plot shows most of thelong-term spectral averages (LTSA). Spectral-averaging is aprocessing technique, an LTSA was generated from HARP data

  18. Direct and quantitative broadband absorptance spectroscopy on small objects using Fourier transform infrared spectrometer and bilayer cantilever probes

    E-Print Network [OSTI]

    Hsu, Wei-Chun

    A measurement platform is introduced that combines a bilayer cantilever probe with a Fourier transform infrared spectrometer to measure absolute spectral absorptance between wavelengths of 3??m and 18??m directly and ...

  19. Broadband superluminescent diodes with bell-shaped spectra emitting in the range from 800 to 900 nm

    SciTech Connect (OSTI)

    Andreeva, E V; Il'ichenko, S N; Kostin, Yu O; Lapin, P I [Superlum Diodes Ltd., Moscow (Russian Federation); Ladugin, M A; Marmalyuk, A A [Open Joint-Stock Company 'M.F. Stel'makh Polyus Research and Development Institute', Moscow (Russian Federation); Yakubovich, S D [Moscow State Institute of Radio-Engineering, Electronics and Automation (Technical University), Moscow (Russian Federation)

    2013-08-31T23:59:59.000Z

    Quantum-well superluminescent diodes (SLD) with extremely thin active (AlGa)As and (InGa)As layers and centre wavelengths about 810, 840, 860 and 880 nm are experimentally studied. Their emission spectrum possesses the shape close to Gaussian, its FWHM being 30 – 60 nm depending on the length of the active channel and the level of pumping. Under cw injection, the output power of light-emitting modules based on such SLDs can amount to 1.0 – 25 mW at the output of a single-mode fibre. It is demonstrated that the operation lifetime of these devices exceeds 30000 hours. Based on the light-emitting modules the prototypes of combined BroadLighter series light sources are implemented having a bell-shaped spectrum with the width up to 100 nm. (optical radiation sources)

  20. Monitoring Long-Range Electron Transfer Pathways in Proteins by Stimulated Attosecond Broadband X-ray Raman Spectroscopy

    SciTech Connect (OSTI)

    Zhang, Yu; Biggs, Jason; Govind, Niranjan; Mukamel, Shaul

    2014-10-09T23:59:59.000Z

    Long-range electron transfer (ET) plays a key role in many biological energy conversion and synthesis processes. We show that nonlinear spectroscopy with attosecond X-ray pulses provides a real time movie of the evolving oxidation states and electron densities around atoms, and can probe these processes with high spatial and temporal resolution. This is demonstrated in a simulation study of the stimulated X-ray Raman (SXRS) signals in Re-modified azurin, which had long served as a benchmark for long-range ET in proteins. Nonlinear SXRS signals are sensitive to the local electronic structure and should offer a novel window for long-range ET.

  1. Nighttime D region electron density profiles and variabilities inferred from broadband measurements using VLF radio emissions from

    E-Print Network [OSTI]

    Cummer, Steven A.

    -to-night variations of the D region electron densities at the midlatitudes. Citation: Cheng, Z., S. A. Cummer, D. N using VLF radio emissions from lightning Zhenggang Cheng,1 Steven A. Cummer,1 Daniel N. Baker,2

  2. Sensitivity calibration of an imaging extreme ultraviolet spectrometer-detector system for determining the efficiency of broadband extreme ultraviolet sources

    SciTech Connect (OSTI)

    Fuchs, S.; Roedel, C.; Bierbach, J.; Paz, A. E.; Foerster, E.; Paulus, G. G. [Institute of Optics und Quantum Electronics, Friedrich-Schiller-University Jena (Germany); Helmholtz-Institute Jena (Germany); Krebs, M. [Institute of Applied Physics, Friedrich-Schiller-University Jena (Germany); Haedrich, S.; Limpert, J. [Helmholtz-Institute Jena (Germany); Institute of Applied Physics, Friedrich-Schiller-University Jena (Germany); Kuschel, S.; Wuensche, M.; Hilbert, V.; Zastrau, U. [Institute of Optics und Quantum Electronics, Friedrich-Schiller-University Jena (Germany)

    2013-02-15T23:59:59.000Z

    We report on the absolute sensitivity calibration of an extreme ultraviolet (XUV) spectrometer system that is frequently employed to study emission from short-pulse laser experiments. The XUV spectrometer, consisting of a toroidal mirror and a transmission grating, was characterized at a synchrotron source in respect of the ratio of the detected to the incident photon flux at photon energies ranging from 15.5 eV to 99 eV. The absolute calibration allows the determination of the XUV photon number emitted by laser-based XUV sources, e.g., high-harmonic generation from plasma surfaces or in gaseous media. We have demonstrated high-harmonic generation in gases and plasma surfaces providing 2.3 {mu}W and {mu}J per harmonic using the respective generation mechanisms.

  3. Investigation of broadband over power line channel capacity of shipboard power system cables for ship communications networks 

    E-Print Network [OSTI]

    Akinnikawe, Ayorinde

    2009-05-15T23:59:59.000Z

    and networking has led to suggestions of applying BPL in other systems including ships. The application of BPL technology using the Shipboard Power System (SPS) as a potential communications network for ship automation systems has been proposed, to achieve recent...

  4. Investigation of broadband over power line channel capacity of shipboard power system cables for ship communications networks

    E-Print Network [OSTI]

    Akinnikawe, Ayorinde

    2009-05-15T23:59:59.000Z

    cables. The work used a multiconductor transmission line theory based approach to model the channel response of SPS distribution lines and estimated the channel throughput capacity using a “water-filling” communication technique. This work found that BPL...

  5. Annual International Symposium on Smart Structures and Materials, 2003 1 Analysis of hybrid PMN/Terfenol broadband transducers in

    E-Print Network [OSTI]

    can be employed effectively to design hybrid systems which augment the performance characteristics for improvement by means of hybrid designs primarily include energy efficiency1 and frequency bandwidth2 . Energy if a system's available electrical energy is shared between different active elements. In practice

  6. Understanding biases in shortwave cloud radiative forcing in the National Center for Atmospheric Research Community Atmosphere

    E-Print Network [OSTI]

    Zhang, Guang Jun

    in response to El Nin~o warming. The vast cloud cover in the region leads to much stronger cloud greenhouse effect in longwave radiation (longwave cloud radiative forcing) and cloud shielding effect in shortwaveUnderstanding biases in shortwave cloud radiative forcing in the National Center for Atmospheric

  7. On the Relationship between Thermodynamic Structure and Cloud Top, and Its Climate Significance in the Arctic

    E-Print Network [OSTI]

    Shupe, Matthew

    longwave radiation, resulting in a warming at the surface--the cloud ``greenhouse'' effect. The mag. The authors test the longwave radiative impact of cloud liquid above the inversion through hypothetical liquid water distributions. Optically thin CII clouds alter the effective cloud emission temperature and can

  8. Application of Improved Radiation Modeling to General Circulation Models

    SciTech Connect (OSTI)

    Michael J Iacono

    2011-04-07T23:59:59.000Z

    This research has accomplished its primary objectives of developing accurate and efficient radiation codes, validating them with measurements and higher resolution models, and providing these advancements to the global modeling community to enhance the treatment of cloud and radiative processes in weather and climate prediction models. A critical component of this research has been the development of the longwave and shortwave broadband radiative transfer code for general circulation model (GCM) applications, RRTMG, which is based on the single-column reference code, RRTM, also developed at AER. RRTMG is a rigorously tested radiation model that retains a considerable level of accuracy relative to higher resolution models and measurements despite the performance enhancements that have made it possible to apply this radiation code successfully to global dynamical models. This model includes the radiative effects of all significant atmospheric gases, and it treats the absorption and scattering from liquid and ice clouds and aerosols. RRTMG also includes a statistical technique for representing small-scale cloud variability, such as cloud fraction and the vertical overlap of clouds, which has been shown to improve cloud radiative forcing in global models. This development approach has provided a direct link from observations to the enhanced radiative transfer provided by RRTMG for application to GCMs. Recent comparison of existing climate model radiation codes with high resolution models has documented the improved radiative forcing capability provided by RRTMG, especially at the surface, relative to other GCM radiation models. Due to its high accuracy, its connection to observations, and its computational efficiency, RRTMG has been implemented operationally in many national and international dynamical models to provide validated radiative transfer for improving weather forecasts and enhancing the prediction of global climate change.

  9. Absolute cavity pyrgeometer

    DOE Patents [OSTI]

    Reda, Ibrahim

    2013-10-29T23:59:59.000Z

    Implementations of the present disclosure involve an apparatus and method to measure the long-wave irradiance of the atmosphere or long-wave source. The apparatus may involve a thermopile, a concentrator and temperature controller. The incoming long-wave irradiance may be reflected from the concentrator to a thermopile receiver located at the bottom of the concentrator to receive the reflected long-wave irradiance. In addition, the thermopile may be thermally connected to a temperature controller to control the device temperature. Through use of the apparatus, the long-wave irradiance of the atmosphere may be calculated from several measurements provided by the apparatus. In addition, the apparatus may provide an international standard of pyrgeometers' calibration that is traceable back to the International System of Units (SI) rather than to a blackbody atmospheric simulator.

  10. USDA Rural Development Washington State Workshop

    Office of Energy Efficiency and Renewable Energy (EERE)

    The U.S. Department of Agriculture is hosting a Washington Rural Development Workshop. Speakers will cover local and regional broadband initiatives program and broadband success stories,...

  11. Nauru Island Effect Detection Data Set

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

    Long, Chuck

    During Nauru99 it was noted that the island was producing small clouds that advected over the ARM site. The Nauru Island Effect Study was run for 1.5 years and the methodology developed to detect the occurrence. Nauru ACRF downwelling SW, wind direction, and air temperature data are used, along with downwelling SW data from Licor radiometers located on the southern end of the island near the airport landing strip. A statistical analysis and comparison of data from the two locations is used to detect the likely occurrence of an island influence on the Nauru ACRF site data

  12. Temperature of broadband anti-Stokes white emission in LiYbP{sub 4}O{sub 12}: Er nanocrystals

    SciTech Connect (OSTI)

    Marciniak, L., E-mail: l.marciniak@int.pan.wroc.pl; Strek, W.; Hreniak, D. [Institute of Low Temperature and Structure Research, Polish Academy of Sciences, 50-422 Wroc?aw (Poland); Guyot, Y. [Institute Light Matter (ILM), UMR5306 CNRS-University Lyon1, University of Lyon, 69622 Villeurbanne (France)

    2014-10-27T23:59:59.000Z

    The up-conversion emission of LiYb{sub 0.99}Er{sub 0.01}P{sub 4}O{sub 12} nanocrystals was investigated in vacuum upon the focused beam of infrared laser excitation. The intense white broad band emission was observed above the threshold power of 800 mW. An increase of excitation power results in enhancement of temperature of emitting nanocrystals. The temperature of nanocrystals was determined following the thermally equilibrated f-f emission transitions of Er{sup 3+} ions. The highest measured temperature of white emission was determined to be about 900?K. It is concluded that the black body radiation is not responsible for the white broad band emission.

  13. Detection of VHE gamma-ray emission from the distant blazar 1ES 1101-232 with H.E.S.S. and broadband characterisation

    E-Print Network [OSTI]

    Akhperjanian, A G; Beilicke, M; Benbow, W; Berge, D; Bernlöhr, K; Boisson, C; Bolz, O; Borrel, V; Braun, I; Brion, E; Brown, A M; Buhler, R; Büsching, I; Boutelier, T; Carrigan, S; Chadwick, P M; Chounet, L M; Coignet, G; Cornils, R; Costamante, L; Degrange, B; Dickinson, H J; Djannati-Atai, A; O'Connor-Drury, L; Dubus, G; Egberts, K; Emmanoulopoulos, D; Espigat, P; Farnier, C; Feinstein, F; Ferrero, E; Fiasson, A; Fontaine, G; Funk, Seb; Funk, S; Fussling, M; Gallant, Y A; Giebels, B; Glicenstein, J F; Glück, B; Goret, P; Hadjichristidis, C; Hauser, D; Hauser, M; Heinzelmann, G; Henri, G; Hermann, G; Hinton, J A; Hoffmann, A; Hofmann, W; Holleran, M; Hoppe, S; Horns, D; Jacholkowska, A; De Jager, O C; Kendziorra, E; Kerschhaggl, M; Khelifi, B; Komin, Nu; Kosack, K; Lamanna, G; Latham, I J; Le Gallou, R; Lemiere, A; Lemoine-Goumard, M; Lohse, T; Martin, J M; Martineau-Huynh, O; Marcowith, A; Masterson, C; Maurin, G; McComb, T J L; Moulin, E; De Naurois, Mathieu; Nedbal, D; Nolan, S J; Noutsos, A; Olive, J P; Orford, K J; Osborne, J L; Panter, M; Pelletier, G; Petrucci, P O; Pita, S; Pühlhofer, G; Punch, M; Ranchon, S; Raubenheimer, B C; Raue, M; Rayner, S M; Ripken, J; Rob, L; Rolland, L; Rosier-Lees, S; Rowell, G; Sahakian, V V; Santangelo, A; Sauge, L; Schlenker, S; Schlickeiser, R; Schroder, R; Schwanke, U; Schwarzburg, S; Schwemmer, S; Shalchi, A; Sol, H; Spangler, D; Spanier, F; Steenkamp, R; Stegmann, C; Superina, G; Tam, P H; Tavernet, J P; Terrier, R; Tluczykont, M; Van Eldik, C; Vasileiadis, G; Venter, C; Vialle, J P; Vincent, P; Völk, H J; Wagner, S J; Ward, M

    2007-01-01T23:59:59.000Z

    The blazar 1ES 1101-232 was observed with the High Energy Stereoscopic System (H.E.S.S.) of Atmospheric Cherenkov Telescopes (ACT) in 2004 and 2005, for a live time of 43 hours. VHE (E > 10^11 eV) gamma-rays were detected for the first time from this object. VHE observations of blazars are used to investigate the inner parts of the blazar jets, and also to study the extragalactic background light (EBL) in the near-infrared band. Observations in 2005 were conducted in a multiwavelength campaign, together with the RXTE satellite and optical observations. In 2004, simultaneous observations with XMM-Newton were obtained. 1ES 1101-232 was detected with H.E.S.S. with an excess of 722 photons, at a significance of 12 sigma. The measured VHE gamma-ray flux amounts to dN/dE = (5.63 +- 0.89) x 10^-13 (E/TeV)^-(2.94 +- 0.20) cm^-2 s^-1 TeV^-1, above a spectral energy threshold of 225 GeV. No significant variation of the VHE gamma-ray flux on any time scale was found. 1ES 1101-232 exhibits a very hard spectrum, and at a ...

  14. Near-infrared and optical broadband surface photometry of 86 face-on disk dominated galaxies. III. The statistics of disk and bulge parameters

    E-Print Network [OSTI]

    Roelof S. de Jong

    1996-01-02T23:59:59.000Z

    The statistics of the fundamental bulge and disk parameters of galaxies and their relation to the Hubble sequence were investigated by an analysis of optical and near-infrared observations of 86 face-on spiral galaxies. The availability of near-infrared K-passband data made it possible for the first time to trace fundamental parameters related to the luminous mass while hardly being hampered by the effects of dust and stellar populations. The observed number frequency of galaxies was corrected for selection effects to calculate volume number densities of galaxies with respect to their fundamental parameters. The main conclusions of this investigation are: 1) Freeman's law has to be redefined. There is no single preferred value for the central surface brightnesses of disks in galaxies. There is only an upper limit to the central surface brightnesses of disks, while for lower central surface brightnesses the number of galaxies per volume element decreases only slowly as function of the central surface brightness. 2) The Hubble sequence type index correlates strongly with the effective surface brightness of the bulge, much better than with the bulge-to-disk ratio. 3) The disk and bulge scalelengths are correlated. 4) These scalelengths are not correlated with Hubble type. Hubble type is a lengthscale-free parameter and each type therefore comes in a range of magnitudes (and presumably a range of total masses). 5) Low surface brightness spiral galaxies are not a separate class of galaxies. In a number of aspects they are a continuation of a trend defined by the high surface brightness galaxies. Low surface brightness galaxies are in general of late Hubble type.

  15. Near-infrared and optical broadband surface photometry of 86 face-on disk dominated galaxies. II. A two-dimensional method to determine bulge and disk parameters

    E-Print Network [OSTI]

    Roelof S. de Jong

    1996-01-01T23:59:59.000Z

    In this paper I present a new two-dimensional decomposition technique, which models the surface photometry of a galaxy with an exponential light profile for both bulge and disk and, when necessary, with a Freeman bar. The new technique was tested for systematic errors on both artificial and real data and compared with widely used one-dimensional decomposition techniques, where the luminosity profile of the galaxy is used. The comparisons indicate that a decomposition of the two-dimensional image of the galaxy with an exponential light profile for both bulge and disk yields the most reproducible and representative bulge and disk parameters. An extensive error analysis was made to determine the reliability of the model parameters. If the model with an exponential bulge profile is a reasonable description of a galaxy, the maximum errors in the derived model parameters are of order 20%. The uncertainties in the model parameters will increase, if the exponential bulge function is replaced by other often used bulge functions as the de Vaucouleurs law. All decomposition methods were applied to the optical and near-infrared data set presented by de Jong & van der Kruit (1994), which comprises 86 galaxies in six passbands.

  16. A technology strategy analysis for the deployment of broadband connectivity for economic development in emerging economies : studying the case of Kenya using the CLIOS process

    E-Print Network [OSTI]

    Omwenga, Brian Gichana

    2009-01-01T23:59:59.000Z

    The role of Information Communication Technology (ICT) in economic development is increasingly moving to the core of national competitiveness strategies around the world thanks to its revolutionary power as a critical ...

  17. Experimental investigation of bright spots in broadband, gated x-ray images of ignition-scale implosions on the National Ignition Facility

    SciTech Connect (OSTI)

    Barrios, M. A.; Suter, L. J.; Glenn, S.; Benedetti, L. R.; Bradley, D. K.; Collins, G. W.; Hammel, B. A.; Izumi, N.; Ma, T.; Scott, H.; Smalyuk, V. A. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)] [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Regan, S. P.; Epstein, R. [Laboratory for Laser Energetics, University of Rochester 250 East River Road, Rochester, New York 14623-199 (United States)] [Laboratory for Laser Energetics, University of Rochester 250 East River Road, Rochester, New York 14623-199 (United States); Kyrala, G. A. [Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)] [Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

    2013-07-15T23:59:59.000Z

    Bright spots in the hot spot intensity profile of gated x-ray images of ignition-scale implosions at the National Ignition Facility [G. H. Miller et al., Opt. Eng. 443, (2004)] are observed. X-ray images of cryogenically layered deuterium-tritium (DT) and tritium-hydrogen-deuterium (THD) ice capsules, and gas filled plastic shell capsules (Symcap) were recorded along the hohlraum symmetry axis. Heterogeneous mixing of ablator material and fuel into the hot spot (i.e., hot-spot mix) by hydrodynamic instabilities causes the bright spots. Hot-spot mix increases the radiative cooling of the hot spot. Fourier analysis of the x-ray images is used to quantify the evolution of bright spots in both x- and k-space. Bright spot images were azimuthally binned to characterize bright spot location relative to known isolated defects on the capsule surface. A strong correlation is observed between bright spot location and the fill tube for both Symcap and cryogenically layered DT and THD ice targets, indicating the fill tube is a significant seed for the ablation front instability causing hot-spot mix. The fill tube is the predominant seed for Symcaps, while other capsule non-uniformities are dominant seeds for the cryogenically layered DT and THD ice targets. A comparison of the bright spot power observed for Si- and Ge-doped ablator targets shows heterogeneous mix in Symcap targets is mostly material from the doped ablator layer.

  18. IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 51, NO. 12, DECEMBER 2003 2469 Broad-Band High-Power Amplifier Using Spatial

    E-Print Network [OSTI]

    York, Robert A.

    --High power, broad bandwidth, high linearity, and low noise are among the most important features in amplifier-power application. A high-power amplifier using the compact combiner design is built and demonstrated to have-Band High-Power Amplifier Using Spatial Power-Combining Technique Pengcheng Jia, Member, IEEE, Lee-Yin Chen

  19. A FOUNDATION FOR ORBITAL RADAR SOUNDING OF EUROPA FROM NEW MEASUREMENTS OF THE BROADBAND DIELECTRIC PROPERTIES OF TERRESTRIAL POLAR ICE CORES. David E.

    E-Print Network [OSTI]

    Stillman, David E.

    E. Grimm1 , Donald D. Blankenship2 , and Dale P. Wine- brenner3 . 1 Dept. of Space Studies at the high-frequency limit (e.g., Figure 1b), its temperature dependence (activation energy) and soluble and decrease its activation energy. Both of these shifts tend to increase attenuation at radar frequencies

  20. Tunable Localized Surface Plasmon-Enabled Broadband Light-Harvesting Enhancement for High-Efficiency Panchromatic Dye-Sensitized Solar Cells

    E-Print Network [OSTI]

    Dang, Xiangnan

    In photovoltaic devices, light harvesting (LH) and carrier collection have opposite relations with the thickness of the photoactive layer, which imposes a fundamental compromise for the power conversion efficiency (PCE). ...

  1. Experimental demonstration of a broadband all-dielectric metamaterial perfect reflector Parikshit Moitra, Brian A. Slovick, Zhi Gang Yu, S. Krishnamurthy, and Jason Valentine

    E-Print Network [OSTI]

    Simaan, Nabil

    -silicon metamaterial with hyperbolic transition in near infrared Appl. Phys. Lett. 103, 021905 (2013); 10 a correlation between the degree of disorder and the reduction in reflectance. It is shown that near-unity reflection is preserved as long as resonator interaction is avoided. Realization of near-unity reflection

  2. Broadband calibration of R//V Ewing seismic sources M. Tolstoy, J. B. Diebold, S. C. Webb, D. R. Bohnenstiehl, E. Chapp,

    E-Print Network [OSTI]

    Bohnenstiehl, Delwayne

    on marine mammals [e.g., Balcomb and Claridge, 2001; Cudahy and Ellison, 2002], and navy low-frequency sonar

  3. alternate nightly nocturnal: Topics by E-print Network

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

    FL, April 1- 4, 1990. Baruch Givoni, 1982. Cooling by Long-Wave Radiation, Passive Solar Journal, Vol. 1, No. 3, p. 131-150. Baruch Givoni, 1994. Passive and Low Energy...

  4. Pierre F.J. Lermusiaux Division of Engineering and Applied Sciences, Harvard University

    E-Print Network [OSTI]

    Robinson, Allan R.

    -stress curl (for ocean upwelling)?, Long-wave radiations (cloud effects)? #12;Surface Temperature: 7 August-23 and maintenance of first upwelling state (Aug 7-18) · Relaxation (Aug 19-23) #12;Adaptive Modeling: Motivations

  5. November 2011 EPL, 96 (2011) 39001 www.epljournal.org

    E-Print Network [OSTI]

    Wettlaufer, John S.

    2011-01-01T23:59:59.000Z

    . ­ Earth's climate is controlled by solar energy input, longwave radiative output and the internal. While basic physics and paleoclimate data show that large increases in green- house forcing lead

  6. Implications and mitigation of model mismatch and covariance contamination for hyperspectral chemical agent detection

    E-Print Network [OSTI]

    Niu, Sidi

    Most chemical gas detection algorithms for long-wave infrared hyperspectral images assume a gas with a perfectly known spectral signature. In practice, the chemical signature is either imperfectly measured and/or exhibits ...

  7. Low-frequency electromagnetic field in a Wigner crystal

    SciTech Connect (OSTI)

    Stupka, Anton [Oles Honchar Dnipropetrovs'k National University, Gagarin Ave., 72, 49010 Dnipropetrovs'k (Ukraine)

    2013-03-15T23:59:59.000Z

    Long-wave low-frequency oscillations are described in a Wigner crystal by generalization of the reverse continuum model for the case of electronic lattice. The internal self-consistent long-wave electromagnetic field is used to describe the collective motions in the system. The eigenvectors and eigenvalues of the obtained system of equations are derived. The velocities of longitudinal and transversal sound waves are found.

  8. A Smart Sensor Web for Ocean Observation: System Design, Architecture, and Performance

    E-Print Network [OSTI]

    Arabshahi, Payman

    with inductive battery charging; (2) a glider with integrated acoustic communications and broadband receiving

  9. CONSTRAINTS ON SUBDUCTION GEODYNAMICS FROM SEISMIC ANISOTROPY

    E-Print Network [OSTI]

    , as downwelling limbs of the mantle's convective system, drive the secular cooling of the Earth. Subduction zones 2012; revised 4 March 2013; accepted 6 March 2013; published 12 April 2013. [1] Much progress has been for probing mantle dynamics in subduction systems. Here I review the observational con- straints on seismic

  10. Infrared Thermometer (IRT) Handbook

    SciTech Connect (OSTI)

    VR Morris

    2006-10-30T23:59:59.000Z

    The Infrared Thermometer (IRT) is a ground-based radiation pyrometer that provides measurements of the equivalent blackbody brightness temperature of the scene in its field of view. The downwelling version has a narrow field of view for measuring sky temperature and for detecting clouds. The upwelling version has a wide field of view for measuring the narrowband radiating temperature of the ground surface.

  11. One-dimensional snow water and energy balance model for vegetated surfaces

    E-Print Network [OSTI]

    Yang, Zong-Liang

    One-dimensional snow water and energy balance model for vegetated surfaces Jiming Jin,2 Xiaogang heat ¯ux (W mÀ2 ) Iprec heat ¯ux of precipitation (W mÀ2) I5 s downwelling solar radiation (W mÀ2, USA. Email: jjm@hwr.arizona.edu or gao@hwr.arizona.edu Contract grant sponsor: NASA

  12. On the Penetration of the 660 km Phase Change by Mantle Downflows

    E-Print Network [OSTI]

    in an upward force which resists the passage of the downwelling through the phase change. Cold material piles up and spreads lat- erally on the phase-change boundary. Eventu- ally, enough cold materialOn the Penetration of the 660 km Phase Change by Mantle Downflows David Bercovici Department

  13. Geophysical Research Abstracts Vol. 13, EGU2011-9360-4, 2011

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Tech and the German Aerospace Center (DLR), aiming at estimating surface downwelling solar irradiance (SSI of cloudless shortwave solar spectra incident on horizontal, tilted, or tracking surfaces, Solar energy, vol irradiance database for worldwide solar heat gain and building cooling load calculations. Solar Energy, vol

  14. Interactive Feedback between ENSO and the Indian Ocean in an Interactive Ensemble Coupled Model

    E-Print Network [OSTI]

    Kang, In-Sik

    . In turn, the anomalous easterlies generate oceanic- upwelling Kelvin waves over the western Pacific, which ensemble coupled model. From a long-term simulation of the coupled GCM, it is shown that El Niño events waves off of the equator. The downwelling Rossby waves, which result in SST warming, propagate slowly

  15. Tropical Moored Buoy Implementation Panel (TIP) Report M. J. McPhaden, NOAA/PMEL

    E-Print Network [OSTI]

    Hole technical report in December 2002. Barometric pressure and downwelling long wave radiation from study of equatorial upwelling in the Pacific, incorporating intensive field measurements in the framework of the TAO/TRITON array. The planned study, called PUMP (Pacific Upwelling and Mixing Physics

  16. Annual recruitment of three species of tide-pool fishes is driven by variation in springtime coastal hydrodynamics

    E-Print Network [OSTI]

    recruitment and upwelling and downwelling, date of the spring transition, and spring wave climate. There were no significant regressions between springtime upwelling and recruitment in any species. The timing of the spring. maculosus recruitment and hours in April and May when waves were .2 and .3 m in amplitude

  17. Tracking El Nio using optical indices of phytoplankton dynamics in the equatorial Pacific

    E-Print Network [OSTI]

    Kurapov, Alexander

    waves are trapped on the equator by coriolis and cause downwelling. This causes the normal upwelling continued long enough to force the western Pacific warm pool east and shut down upwelling entirely weaken and then reverse causing Kelvin waves to propagate eastward across the open ocean. These Kelvin

  18. J. Fluid Mech., page 1 of 46 c Cambridge University Press 2011 doi:10.1017/jfm.2011.100

    E-Print Network [OSTI]

    Bees, Martin

    -stability analysis in a layer of finite depth are analysed in detail using analytical and numerical methods. Results and oscillatory modes are found and explained. Dramatically different behaviour is obtained for the model boundary since gyrotactic cells swim towards regions of marginally downwelling fluid (Kessler 1985

  19. Convective Instability of a Boundary Layer with

    E-Print Network [OSTI]

    Conrad, Clint

    proportional to the integral over the depth of the lithosphere of the 19 #12;ratio of thermal buoyancy. Such instabilities are driven by the negative thermal buoyancy of the cold lithosphere and retarded largely for driving convective downwelling. For non-Newtonian viscosity with power law exponent n and temperature

  20. Convective instability of a boundary layer with temperature-and strain-rate-dependent viscosity in terms of `available buoyancy'

    E-Print Network [OSTI]

    Conrad, Clint

    be approximately proportional to the integral over the depth of the lithosphere of the ratio of thermal buoyancy. Such instabilities are driven by the negative thermal buoyancy of the cold lithosphere and retarded largely for driving convective downwelling. For non-Newtonian viscosity with power law exponent n and temperature

  1. Study of the possible benefits of cloud products of EUMETSAT in solar energy

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    -derived assessments of surface downwelling solar irradiance are more and more used by engineering companies in solar plane (SSI) are more and more used by engineering companies in solar energy. Performances are judgedStudy of the possible benefits of cloud products of EUMETSAT in solar energy Zhipeng Qu, Philippe

  2. Comparison between Model Simulations and Measurements of Hyperspectral Far- infrared Radiation from FIRST during the RHUBC-II Campaign

    E-Print Network [OSTI]

    Baugher, Elizabeth

    2012-02-14T23:59:59.000Z

    to be inferred from the brightness temperature differences at 250 and 559.5 cm-1. Aerosols proved to reduce downwelling radiance by half that a clear-sky would emit, but had little effect on the total far-IR radiative forcing. Furthermore, these far...

  3. NOAA Technical Memorandum OAR PMEL-121 ATLAS Module Temperature Bias Due to Solar

    E-Print Network [OSTI]

    NOAA Technical Memorandum OAR PMEL-121 ATLAS Module Temperature Bias Due to Solar Heating P.N. A. . . . . . . . . . . . . . . . . . . . . . . . . . 3 3 Temperature time series from a 1 m Seacat, NX Modules at 1 m and 10 m, and downwelling solar values for a given day. . 6 #12;iv Contents #12;ATLAS Module Temperature Bias Due to Solar Heating P.N. A

  4. Optical effect on the nitracline in a coastal upwelling area Dag L. Aksnes1

    E-Print Network [OSTI]

    Aksnes, Dag L.

    of California­San Diego, La Jolla, California 92093-0218 Pascal Rivie`re LEMAR, Institut Universitaire Europe of downwelling irradiance because of a low phototrophic biomass and reduced concentrations of other particulate nutrient input to the euphotic zone leading to higher phototrophic biomass (Lewis et al. 1988), but it also

  5. JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 97, NO.C4, PAGES 5651-5664, APRIL 15, 1992 Observed Growth of Langmuir Circulation

    E-Print Network [OSTI]

    Smith, Jerome A.

    occurs more often, over the majority of the world oceans. Frequently, the two driving forces occur mixing and its effects? When wind blows over water, lines are often visible on the surface, running these to be lines of convergence along the surface, with downwelling below each line. He found also that maxima

  6. Wednesday, February 20, 2013 Homework 2 Due Wednesday, Feb 27 (D2L and web page)

    E-Print Network [OSTI]

    Toohey, Darin W.

    cold temperatures along the west coast of South America be caused by Ekman transport? A. Yes B.3 This Ekman transport (pulling of the upper ~100 meters of water to the right of the surface winds) results or less #12;Another consequence of the coriolis effect (Ekman Transport) is for upwelling and downwelling

  7. An Assessment of the Parameterization of Subgrid-Scale Cloud Effects on Radiative Transfer. Part II: Horizontal Inhomogeneity

    E-Print Network [OSTI]

    Stephens, Graeme L.

    in downwelling radiative fluxes at the surface induced by changes in cloud cover and water vapor distributions. 1An Assessment of the Parameterization of Subgrid-Scale Cloud Effects on Radiative Transfer. Part II form 5 January 2005) ABSTRACT The role of horizontal inhomogeneity in radiative transfer through cloud

  8. Networking technology adoption : system dynamics modeling of fiber-to-the-home

    E-Print Network [OSTI]

    Kelic, Andjelka, 1972-

    2005-01-01T23:59:59.000Z

    A system dynamics model is developed and run to study the adoption of fiber-to-the-home as a residential broadband technology. Communities that currently do not have broadband in the United States are modeled. This case ...

  9. Curvature-directed Crystallization of Polymer Dielectrics in Nanopores

    E-Print Network [OSTI]

    Reid, Dariya

    2013-11-26T23:59:59.000Z

    . BROADBAND DIELECTRIC SPECTROSCOPY…………………………………. 44 vii 5.1 Introduction to Broadband Dielectric Spectroscopy of iPP-Filled AAO Templates……………………………………………………………………….. 44 5.2 Sample BDS Data of iPP-Filled AAO Templates……………………………… 45 6...

  10. andrezej legocki hermann: Topics by E-print Network

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

    of the line impedance and thus does not limit the high frequency response. The broadband transformers consist ort No. 28 A BROADBAND AMPLIFIER - 161 MHz Hermann von Hoern r...

  11. Terahertz Imaging and Remote Sensing Design for Applications in Medical Imaging

    E-Print Network [OSTI]

    Sung, Shijun

    2013-01-01T23:59:59.000Z

    A similar type of ultrafast laser (pulse duration: 230 fs,generates broadband pulses in the ultrafast substrate

  12. Communication: Spectroscopic phase and lineshapes in high-resolution...

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

    Communication: Spectroscopic phase and lineshapes in high-resolution broadband sum frequency vibrational spectroscopy: Resolving Communication: Spectroscopic phase and lineshapes...

  13. Coherent control and manifestation of inequality of forward and reversed processes in optics

    E-Print Network [OSTI]

    V. A. Kuz'menko

    2004-03-12T23:59:59.000Z

    The experiments with broadband down-converted light clearly show inequality of forward and reversed processes in optics.

  14. ECE639 Spring 2014 List of References 1. J. Kurose and K. Ross, Computer Networking: A Top Down Approach Using the Internet, Addison-Wesley

    E-Print Network [OSTI]

    Ansari, Nirwan

    , Prentice Hall, 1999. 28. S.V. Ahamed and V.B. Lawrence, Intelligent Broadband Multimedia Networks, Kluwer

  15. BaBrI:Eu2 + , a new bright scintillator

    E-Print Network [OSTI]

    Bourret-Courchesne, E.D.

    2010-01-01T23:59:59.000Z

    of  a  divalent  europium  5d-­4f  transition.   F igureto   the   divalent   europium   5d-­4f   broadband  

  16. SHORT PERIOD SURFACE WAVE DISPERSION ACROSS THE MEDITERRANEAN REGION: IMPROVEMENTS USING REGIONAL SEISMIC NETWORKS

    E-Print Network [OSTI]

    Ritzwolle, Mike

    tomography to broad-band seismic data obtained in Europe, North Africa, the Middle East, and Central Asia

  17. Dispersion of swimming algae in laminar and turbulent channel flows: theory and simulations

    E-Print Network [OSTI]

    Croze, O A; Ahmed, M; Bees, M A; Brandt, L

    2012-01-01T23:59:59.000Z

    Algal swimming is often biased by environmental cues, e.g. gravitational and viscous torques drive cells towards downwelling fluid (gyrotaxis). In view of biotechnological applications, it is important to understand how such biased swimming affects cell dispersion in a flow. Here, we study the dispersion of gyrotactic swimming algae in laminar and turbulent channel flows. By direct numerical simulation (DNS) of cell motion within upwelling and downwelling channel flows, we evaluate time-dependent measures of dispersion for increasing values of the flow Peclet (Reynolds) numbers, Pe (Re). Furthermore, we derive an analytical `swimming Taylor-Aris dispersion' theory, using flow-dependent transport parameters given by existing microscopic models. In the laminar regime, DNS results and analytical predictions compare very well, providing the first confirmation that cells' response to flow is best described by the generalized-Taylor-dispersion microscopic model. We predict that cells drift along a channel faster th...

  18. Art in Special Collections: Latino and African American Fine Art and Photography Collections in Academic Institutions

    E-Print Network [OSTI]

    Hankins, Rebecca; Juarez, Miguel

    2010-05-15T23:59:59.000Z

    . enhannulled. nullontent. anullailable. nullia. broadband. is. nullreatinnull. a. senullondnullnulleneration.dinullide.null nullnull .In.nullnullnullnull.the.null.S..Connullress.appronull priated. nullnull.null. billion. to. establish. the. nullroadband.... nullenullhnolonully. nullpportunities.nullronullranull.(nullnullnullnullnull.that.pronullides.anullards.to.elinullible. entities.to.denullelop.and.enullpand.broadband.sernullinulles.to.unsernulled. and.undersernulled.areas.and.inullpronulle.anullnulless.to.broadband...

  19. A theoretical study of remote and in-situ sensing of water borne chlorophyll

    E-Print Network [OSTI]

    Humphreys, Terry James

    1974-01-01T23:59:59.000Z

    used in the construction of a com- puter program to simulate the interactions within the earth' s atmosphere-ocean system. Using the Monte Carlo code, upwel'ling and downwelling components of the radiance and irradiance were calculated.... The calculated quantities were combined i, o form irrad~ance ratios, radiance ratios, and radiance ? irrad':ance ratios. The c ~', cula- tions were performed as a function of chlor or nyl 1 concentration at several wavelengths withir. the visible region...

  20. Ohio Academic Resources Network (OARnet) part of $141.3 million in broadband stimulus grants The Ohio Academic Resources Network (OARnet), the technology operations arm of the University System of Ohio

    E-Print Network [OSTI]

    The Ohio Academic Resources Network (OARnet), the technology operations arm of the University System one traditional science and engineering discipline in order to accelerate both research progress of mechanical engineering and physics will lead the project Cryogenic Peltier Cooling. Collaborators