Sample records for lacs magpie hartland

  1. Hartland Wind Farm | 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, search OpenEI ReferenceJumpEnergyStrategy | OpenHalfWindHartland Wind Farm Jump

  2. Monochromatic radiography of high energy density physics experiments on the MAGPIE generator

    SciTech Connect (OSTI)

    Hall, G. N., E-mail: gareth.hall@imperial.ac.uk; Burdiak, G. C.; Suttle, L.; Stuart, N. H.; Swadling, G. F.; Lebedev, S. V.; Smith, R. A.; Patankar, S.; Suzuki-Vidal, F.; Grouchy, P. de; Harvey-Thompson, A. J.; Bennett, M.; Bland, S. N.; Pickworth, L.; Skidmore, J. [The Blackett Laboratory, Imperial College, London SW7 2BW (United Kingdom)

    2014-11-15T23:59:59.000Z

    A monochromatic X-ray backlighter based on Bragg reflection from a spherically bent quartz crystal has been developed for the MAGPIE pulsed power generator at Imperial College (1.4 MA, 240ns) [I. H. Mitchell et al., Rev. Sci. Instrum. 67, 1533 (2005)]. This instrument has been used to diagnose high energy density physics experiments with 1.865 keV radiation (Silicon He-?) from a laser plasma source driven by a ?7 J, 1 ns pulse from the Cerberus laser. The design of the diagnostic, its characterisation and performance, and initial results in which the instrument was used to radiograph a shock physics experiment on MAGPIE are discussed.

  3. The Coronae of AR Lac

    E-Print Network [OSTI]

    Huenemoerder, David P.

    We observed the coronally active eclipsing binary AR Lac with the High Energy Transmission Grating on Chandra for a total of 97 ks, spaced over five orbits, at quadratures and conjunctions. Contemporaneous and simultaneous ...

  4. Modeling the Lac repressor-operator assembly: The influence of DNA looping on Lac

    E-Print Network [OSTI]

    number, and the end conditions imposed by the LacR tetramer. The tetramer can assume two types of confor

  5. Host galaxies and environment of BL Lac objects

    E-Print Network [OSTI]

    J. Heidt

    1998-12-14T23:59:59.000Z

    Since the last meeting on BL Lac objects 10 years ago, BL Lac host galaxies and their cluster environment have gained much attention. Hence, our current knowledge of the properties of BL Lac host galaxies and their cluster environment has improved considerably, which will be reviewed. The importance of future observing programs using (very) large telescopes is briefly outlined.

  6. Four New BL Lac Surveys: Sampling New Populations

    E-Print Network [OSTI]

    S. A. Laurent-Muehleisen; R. H. Becker; W. Brinkmann; J. Siebert; E. D. Feigelson; R. I. Kollgaard; G. D. Schmidt; P. S. Smith

    1998-10-15T23:59:59.000Z

    The advent of large area deep radio and X-ray surveys is leading to the creation of many new BL Lac samples. In particular, the ROSAT All-Sky, Green Bank and FIRST surveys are proving to be rich sources of new BL Lacs. We will discuss the methods used in four independent BL Lac searches based on these surveys. Comparison of the broadband spectral energy distributions of these BL Lacs with those of previously known objects clearly points to the existence of a large previously unrecognized population of objects with characteristics intermediate between those exhibited by Low and High energy peaked BL Lacs.

  7. BATSE observations of BL Lac Objects

    E-Print Network [OSTI]

    V. Connaughton; C. R. Robinson; M. L. McCollough; S. A. Laurent-Muehleisen

    1998-11-07T23:59:59.000Z

    The Burst and Transient Source Experiment (BATSE) on the Compton Gamma-Ray Observatory has been shown to be sensitive to non-transient hard X-ray sources in our galaxy, down to flux levels of 100 mCrab for daily measurements, 3 mCrab for integrations over several years. We use the continuous BATSE database and the Earth Occultation technique to extract average flux values between 20 and 200 keV from complete radio- and X-ray- selected BL Lac samples over a 2 year period.

  8. Mille Lacs Energy Cooperative | 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 YouKizildere I Geothermal Pwer Plant JumpMarysville, Ohio:Menomonee|Mililani Town, Hawaii:Mille Lacs County,

  9. Lac Courte Oreilles Energy Analysis Project

    SciTech Connect (OSTI)

    Leslie Isham; Denise Johnson

    2009-04-01T23:59:59.000Z

    The Lac Courte Oreilles Tribe applied for first step funding in 2007 and was awarded in October of that year. We wanted to perform an audit to begin fulfilling two commitments we made to our membership and resolutions that we adopted. One was the Kyoto Protocol and reduce our carbon emissions by 25% and to produce 25% of our energy by sustainable means. To complete these goals we needed to begin with first assessing what our carbon emissions are and begin taking the steps to conserve on the energy we currently use. The First Step Grant gave us the opportunity to do this. Upon funding the Energy Project was formed under the umbrella of the LCO Public Works Department and Denise Johnson was hired as the coordinator. She quickly began fulfilling the objectives of the project. Denise began by contact the LCO College and hiring interns who were able to go to each Tribal entity and perform line logging to read and document the energy used for each electrical appliance. Data was also gathered for one full year from each entity for all their utility bills (gasoline, electric, natural gas, fuel oil, etc.). Relationships were formed with the Green Team and other Green Committees in the area that could assist us in this undertaking. The Energy Task Force was of great assistance as well recommending other committees and guidance to completing our project. The data was gathered, compiled and placed into spreadsheets that would be understandable for anyone who didn't have a background in Renewable Resources. While gathering the data Denise was also looking for ways to conserve energy usage, policies changes to implement and any possible viable renewable energy resources. Changes in the social behaviors of our members and employees will require further education by workshops, energy fairs, etc.. This will be looked into and done in coordination with our schools. The renewable resources seem most feasible are wind resources as well as Bio Mass both of which need further assessment and funding to do so will be sought. While we already are in ownership of a Hydro Dam it is currently not functioning to its full capacity we are seeking operation and maintenance firm proposals and funding sources. One of our biggest accomplishment this project gave us was our total Carbon Emissions 9989.45 tons, this will be the number that we will use to base our reductions from. It will help us achieve our goals we have set for ourselves in achieving the Kyoto Protocol and saving our Earth for our future generations. Another major accomplishment and lesson learned is we need to educate ourselves and our people on how to conserve energy to both impact the environment and our own budgets. The Lac Courte Oreilles (LCO) Energy Analysis Project will perform an energy audit to gather information on the Tribe's energy usage and determine the carbon emissions. By performing the audit we will be able to identify areas where conservation efforts are most viable and recommend policies that can be implemented. These steps will enable LCO to begin achieving the goals that have been set by the Tribal Governing Board and adopted through resolutions. The goals are to reduce emissions by 25% and to produce 25% of its energy using sustainable sources. The project objectives were very definitive to assist the Tribe in achieving its goals; reducing carbon emissions and obtaining a sustainable source of energy. The following were the outlined objectives: (1) Coordinate LCO's current and future conservation and renewable energy projects; (2) Establish working relationships with outside entities to share information and collaborate on future projects; (3) Complete energy audit and analyze LCO's energy load and carbon emissions; (4) Identify policy changes, education programs and conservation efforts which are appropriate for the LCO Reservation; and (5) Create a plan to identify the most cost effective renewable energy options for LCO.

  10. Magnetic Field Geometry in "Red" and "Blue" BL Lacs

    E-Print Network [OSTI]

    P. Kharb; D. C. Gabuzda; P. Shastri

    2003-01-06T23:59:59.000Z

    We compare the systematics of the magnetic field geometry in the "red" low-energy peaked BL Lacs (LBLs) and "blue" high-energy peaked BL Lacs (HBLs) using VLBI polarimetric images. The LBLs are primarily "radio--selected" BL Lacs and the HBLs are primarily "X-ray selected". In contrast to the LBLs, which show predominantly transverse jet magnetic fields, the HBLs show predominantly longitudinal fields. Thus, while the SED peaks of core-dominated quasars, LBLs and HBLs form a sequence of increasing frequency, the magnetic field geometry does not follow an analogous sequence. We briefly investigate possible connections between the observed parsec-scale magnetic field structures and circular polarization measurements in the literature on various spatial scales.

  11. Magpie | 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 YouKizildere I Geothermal Pwer Plant Jump to:LandownersLuther,Jemez Pueblo Area (DOE GTP)Texas: Energy

  12. Hartland, Connecticut: Energy Resources | 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 are8COaBulkTransmissionSitingProcess.pdfGetec AG| OpenInformation HandbookOhio:Connecticut: EnergyConnecticut:

  13. Hartland, Vermont: Energy Resources | 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 are8COaBulkTransmissionSitingProcess.pdfGetec AG| OpenInformation HandbookOhio:Connecticut:

  14. Hartland, Wisconsin: Energy Resources | 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 are8COaBulkTransmissionSitingProcess.pdfGetec AG| OpenInformation HandbookOhio:Connecticut:Wisconsin: Energy

  15. Wind Resource Assessment Report: Mille Lacs Indian Reservation, Minnesota

    SciTech Connect (OSTI)

    Jimenez, A. C.

    2013-12-01T23:59:59.000Z

    The U.S. Environmental Protection Agency (EPA) launched the RE-Powering America's Land initiative to encourage development of renewable energy on potentially contaminated land and mine sites. EPA collaborated with the U.S. Department of Energy's (DOE's) National Renewable Energy Laboratory (NREL) and the Mille Lacs Band of Chippewa Indians to evaluate the wind resource and examine the feasibility of a wind project at a contaminated site located on the Mille Lacs Indian Reservation in Minnesota. The wind monitoring effort involved the installation of a 60-m met tower and the collection of 18 months of wind data at multiple heights above the ground. This report focuses on the wind resource assessment, the estimated energy production of wind turbines, and an assessment of the economic feasibility of a potential wind project sited this site.

  16. Measurement of the Integrated Faraday Rotations of BL Lac Objects

    E-Print Network [OSTI]

    A. B. Pushkarev

    2003-07-09T23:59:59.000Z

    We present the results of multi-frequency polarization VLA observations of radio sources from the complete sample of northern, radio-bright BL Lac objects compiled by H. Kuhr and G. Schmidt. These were used to determine the integrated rotation measures of 18 objects, 15 of which had never been measured previously, which hindered analysis of the intrinsic polarization properties of objects in the complete sample. These measurements make it possible to correct the observed orientations of the linear polarizations of these sources for the effect of Faraday rotation. The most probable origin for Faraday rotation in these objects is the Galactic interstellar medium. The results presented complete measurements of the integrated rotation measures for all 34 sources in the complete sample of BL Lac objects.

  17. LAC Regional Platform Workshop Report | 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 YouKizildere I Geothermal Pwer Plant Jump to: navigation, search GEOTHERMALTexas:Kuju KankoAnnouncement AgendaLAC LEDS

  18. Lac La Belle, Wisconsin: Energy Resources | 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 YouKizildere I Geothermal Pwer Plant Jump to: navigation,working-groups < LEDSGP‎LEEPuente,Salle,LaMoureEnergyLac La

  19. Lac qui Parle County, Minnesota: Energy Resources | Open Energy Information

    Open Energy Info (EERE)

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  20. Lac qui Parle Valley School Wind Farm | Open Energy Information

    Open Energy Info (EERE)

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  1. Mille Lacs County, Minnesota: Energy Resources | 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 YouKizildere I Geothermal Pwer Plant JumpMarysville, Ohio:Menomonee|Mililani Town, Hawaii:Mille Lacs County, Minnesota:

  2. High-energy cosmic neutrinos from spine-sheath BL Lac jets

    E-Print Network [OSTI]

    Tavecchio, F

    2014-01-01T23:59:59.000Z

    We recently proposed that structured (spine-sheath) jets associated to BL Lac objects offer a suitable environment for the production of the extragalactic high-energy ($E>100$ TeV) neutrino recently revealed by IceCube. Our previous analysis was limited to low-power BL Lac objects. We extend our preliminary study to the entire BL Lac population. We assume that the power of cosmic rays as well as the radiative luminosity of the sheath depend linearly on the the jet power. In turn, we assume that the latter is well traced by the $\\gamma$-ray luminosity. We exploit the BL Lac $\\gamma$-ray luminosity function and its cosmic evolution as recently inferred from Fermi-LAT data to derive the expected neutrino cumulative intensity from the entire BL Lac population. When considering only the low-power BL Lacs, a large cosmic ray power for each source is required to account for the neutrino flux. Instead, if BL Lacs of all powers produce neutrinos, the power demand decreases, and the required cosmic ray power becomes of...

  3. Single-molecule FRET reveals sugar-induced conformational dynamics in LacY

    E-Print Network [OSTI]

    2007-01-01T23:59:59.000Z

    Energy Transfer (sm-FRET) is used to test this model with wild-wild-type or mutant LacY for ligand and the change in free energy (

  4. Sustaining the natural and economical resources of the Lac Courte Oreilles, Leslie Isham; Jason Weaver

    SciTech Connect (OSTI)

    Isham, Leslie; Weaver, Jason

    2013-09-30T23:59:59.000Z

    The Lac Courte Oreilles Band of Lake Superior Chippewa Indians, located in northwest Wisconsin has developed a project, entitled Sustaining the Natural and Economic Resources of the LCO Ojibwe. This technical report is a summary of the project.

  5. High-Resolution Radio Imaging of Gravitational Lensing Candidates in the 1 Jansky BL Lac Sample

    E-Print Network [OSTI]

    T. A. Rector; J. T. Stocke

    2003-02-19T23:59:59.000Z

    While BL Lacertae objects are widely believed to be highly beamed, low-luminosity radio galaxies, many radio-selected BL Lacs have extended radio power levels and optical emission lines that are too luminous to be low-luminosity radio galaxies. Also, Stocke & Rector discovered an excess of MgII absorption systems along BL Lac sightlines compared to quasars, suggesting that gravitational lensing may be another means of creating the BL Lac phenomenon in some cases. We present a search for gravitationally-lensed BL Lacs with deep, high-resolution, two-frequency VLA radio maps of seven lensing candidates from the 1 Jansky BL Lac sample. We find that none of these objects are resolved into an Einstein ring like B 0218+357, nor do any show multiple images of the core. All of the lensing candidates that were resolved show a flat-spectrum core and very unusual, steep-spectrum extended morphology that is incompatible with a multiply lensed system. Thus, while these observations do not rule out microlensing, no macrolensing is observed.

  6. INFRARED SPECTRAL OBSERVATION OF EIGHT BL LAC OBJECTS FROM THE SPITZER INFRARED SPECTROGRAPH

    SciTech Connect (OSTI)

    Chen, P. S.; Shan, H. G., E-mail: iraspsc@yahoo.com.cn [National Astronomical Observatories/Yunnan Observatory and Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011 (China)

    2011-05-01T23:59:59.000Z

    The Spitzer Infrared Spectrograph (IRS) low-resolution spectra for eight BL Lac objects are presented in this paper. It can be seen that the infrared spectrum of S5 0716+714 shows in the IRS region many emission features that would be from a nearby galaxy. It is also shown that, except for the silicate absorptions around 10 {mu}m for some sources, emission lines in the infrared spectra for the other seven BL Lac objects are indeed very weak or absent. In addition, ignoring the silicate feature, all spectra can be well fitted by a power-law distribution indicative of the emission mechanism of the synchrotron radiation for these BL Lac objects in the IRS region.

  7. Lead isotope study of the late Archean Lac des Iles palladium deposit, Canada: enrichment of platinum

    E-Print Network [OSTI]

    ARTICLE Lead isotope study of the late Archean Lac des Iles palladium deposit, Canada: enrichment Lead isotopic compositions of mineral separates are presented from the mineralized zones (Roby Province of Canada. Plagioclase separates show Pb isotope ratios similar to those of the late Archean

  8. The cultural eutrophication of Lac la Biche, Alberta, Canada: a paleoecological study

    E-Print Network [OSTI]

    Wolfe, Alexander P.

    The cultural eutrophication of Lac la Biche, Alberta, Canada: a paleoecological study D in northeastern Alberta, Canada, revealed that the lake was eutrophic before European settlement but has undergone additional cultural eutrophication in the past 30 to 50 years. Annual fluxes to sediments of phosphorus

  9. An X-ray jet in the BL Lac S5 2007+777

    E-Print Network [OSTI]

    R. M. Sambruna; D. Donato; C. C. Cheung; F. Tavecchio; L. Maraschi

    2007-07-10T23:59:59.000Z

    The BL Lac S5 2007+777 was observed by us with Chandra, to find the X-ray counterpart to its 18" radio jet, and study its structure. Indeed, a bright X-ray jet was discovered in the 33 ks ACIS-S image of the source. We present its properties and briefly discuss the implications.

  10. Intensive monitoring of the strongly variable BL Lac S5 0716+714

    E-Print Network [OSTI]

    K. Otterbein; M. J. Hardcastle; S. J. Wagner; D. M. Worrall

    1998-01-24T23:59:59.000Z

    The BL Lac object S5 0716+714 was monitored during a multifrequency campaign in 1996. Preliminary analysis of the optical, ROSAT and RXTE data are presented. Strong variability on short time scales was observed. The data suggest an interpretation within a multi-component model.

  11. A 33 yr CONSTANCY OF THE X-RAY CORONAE OF AR Lac AND ECLIPSE DIAGNOSIS OF SCALE HEIGHT

    E-Print Network [OSTI]

    Drake, Jeremy J.

    Extensive X-ray and EUV photometric observations of the eclipsing RS CVn system AR Lac were obtained over the years 1997-2013 with the Chandra X-Ray Observatory Extreme-Ultraviolet Explorer (EUVE). During primary eclipse, ...

  12. New statistical results on the optical IDV data of BL Lac S5 0716+714

    E-Print Network [OSTI]

    Danila, B; Mocanu, G

    2014-01-01T23:59:59.000Z

    This paper reports on the statistical behaviour of the optical IntraDay Variability of BL Lac S5 0716+714. Available IntraDay Variability data in the optical is tested to see whether or not the magnitude is log-normally distributed. It was consistently found that this is not the case. This is in agreement with a previous discussion for data for the same object but in a different observational period. Simultaneously, the spectral slope of the light curves is calculated. The implications of these findings for models which discuss both the location and the source of IntraDay Variability are presented.

  13. Lac du Flambeau Band of Lake Superior Chippewa Indians Strategic Energy Plan

    SciTech Connect (OSTI)

    Bryan Hoover

    2009-11-16T23:59:59.000Z

    This plan discusses the current energy use on the Lac du Flambeau Reservation, the current status of the Tribe's energy program, as well as the issues and concerns with energy on the reservation. This plan also identifies and outlines energy opportunities, goals, and objectives for the Tribe to accomplish. The overall goal of this plan is to address the energy situation of the reservation in a holistic manner for the maximum benefit to the Tribe. This plan is an evolving document that will be re-evaluated as the Tribe's energy situation changes.

  14. POWERFUL HIGH-ENERGY EMISSION OF THE REMARKABLE BL Lac OBJECT S5 0716+714

    SciTech Connect (OSTI)

    Vittorini, V.; Chen, A. W.; Ferrari, A. [CIFS-Torino, Viale Settimio Severo 3, I-10133, Torino (Italy); Tavani, M.; D'Ammando, F.; Donnarumma, I.; Pacciani, L.; Pucella, G. [INAF/IASF-Roma, Via del Fosso del Cavaliere 100, I-00133 Roma (Italy); Paggi, A.; Cavaliere, A. [University of Rome, 'Tor Vergata', Via della Ricerca Scientifica 1, I-00133 Roma (Italy); Bulgarelli, A. [INAF/IASF-Bologna, Via Gobetti 101, I-40129 Bologna (Italy); Giuliani, A.; Vercellone, S. [INAF/IASF-Milano, Via E. Bassini 15, I-20133 Milano (Italy); Longo, F. [INFN-Trieste, Via Valerio 2, I-34127 Trieste (Italy); Colafrancesco, S.; Giommi, P., E-mail: vittorini@roma2.infn.i [ASDC c/o ESRIN, Via G. Galilei snc, I-00044 Frascati, Roma (Italy)

    2009-12-01T23:59:59.000Z

    BL Lac objects of the intermediate subclass (IBLs) are known to emit a substantial fraction of their power in the energy range 0.1-10 GeV. Detecting gamma-ray emission from such sources provides therefore a direct probe of the emission mechanisms and of the underlying powerhouse. The gamma-ray satellite, AGILE, detected the remarkable IBL S5 0716+714 (z approx = 0.3) during a high state in the period from 2007 September-October, marked by two very intense flares reaching peak fluxes of 200 x 10{sup -8} photons cm{sup -2} s{sup -1} above 100 MeV, with simultaneous optical and X-ray observations. We present here a theoretical model for the two major flares and discuss the overall energetics of the source. We conclude that 0716+714 is among the brightest BL Lac's ever detected at gamma-ray energies. Because of its high power and lack of signs for ongoing accretion or surrounding gas, the source is an ideal candidate to test the maximal power extractable from a rotating supermassive black hole via the pure Blandford-Znajek (BZ) mechanism. We find that during the 2007 gamma-ray flares 0716+714 approached or just exceeded the upper limit set by BZ for a black hole of mass 10{sup 9} M{sub sun}.

  15. Parsec-scale Magnetic-Field Structures in HEAO-1 BL Lacs

    E-Print Network [OSTI]

    P. Kharb; D. Gabuzda; P. Shastri

    2007-11-07T23:59:59.000Z

    We present very long baseline interferometry polarization images of an X-ray selected sample of BL Lacertae objects belonging to the first High Energy Astronomy Observatory (HEAO-1) and the ROSAT-Green Bank (RGB) surveys. These are primarily high-energy-peaked BL Lacs (HBLs) and exhibit core-jet radio morphologies on pc-scales. They show moderately polarized jet components, similar to those of low-energy-peaked BL Lacs (LBLs). The fractional polarization in the unresolved cores of the HBLs is, on average, lower than in the LBLs, while the fractional polarizations in the pc-scale jets of HBLs and LBLs are comparable. However a difference is observed in the orientation of the inferred jet magnetic fields -- while LBL jets are well-known to preferentially exhibit transverse magnetic fields, the HBL jets tend to display longitudinal magnetic fields. Although a `spine-sheath' jet velocity structure, along with larger viewing angles for HBLs could produce the observed magnetic field configuration, differences in other properties of LBLs and HBLs, such as their total radio power, cannot be fully reconciled with the different-angle scenario alone. Instead it appears that LBLs and HBLs differ intrinsically, perhaps in the spin rates of their central black holes.

  16. Institutions and Incentives for R&D: Implications for L.A.C. Economies Walter G. Park,

    E-Print Network [OSTI]

    Lansky, Joshua

    Survey) 3.2 Fiscal Incentives A. Conceptual Issues B. Index of Fiscal Incentives C. Economic EffectsInstitutions and Incentives for R&D: Implications for L.A.C. Economies Walter G. Park, Associate Professor, Department of Economics, American University, Washington, D.C. 20016 August 2002 Abstract

  17. Sequence-Enabled Reassembly of -Lactamase (SEER-LAC): A Sensitive Method for the Detection of Double-Stranded DNA

    E-Print Network [OSTI]

    Ghosh, Indraneel

    Sequence-Enabled Reassembly of -Lactamase (SEER-LAC): A Sensitive Method for the Detection the development of a new methodology for the detection of specific double- stranded DNA sequences. We previously of a predefined DNA sequence. This system, designated sequence-enabled reassembly (SEER), was demonstrated

  18. Multiwavelength Intraday Variability of the BL Lac S5 0716+714

    E-Print Network [OSTI]

    Gupta, Alok C; Wiita, P J; Rani, B; Sokolovsky, K V; Mohan, P; Mangalam, A; Marchili, N; Fuhrmann, L; Agudo, I; Bach, U; Bachev, R; Bttcher, M; Gabanyi, K E; Gaur, H; Hawkins, K; Kimeridze, G N; Kurtanidze, O M; Kurtanidze, S O; Lee, C -U; Liu, X; McBreen, B; Nesci, R; Nestoras, G; Nikolashvili, M G; Ohlert, J M; Palma, N; Peneva, S; Pursimo, T; Semkov, E; Strigachev, A; Webb, J R; Wiesemeyer, H; Zensus, J A

    2012-01-01T23:59:59.000Z

    We report results from a 1 week multi-wavelength campaign to monitor the BL Lac object S5 0716+714 (on December 9-16, 2009). In the radio bands the source shows rapid (~ (0.5-1.5) day) intra-day variability with peak amplitudes of up to ~ 10 %. The variability at 2.8 cm leads by about 1 day the variability at 6 cm and 11 cm. This time lag and more rapid variations suggests an intrinsic contribution to the source's intraday variability at 2.8 cm, while at 6 cm and 11 cm interstellar scintillation (ISS) seems to predominate. Large and quasi-sinusoidal variations of ~ 0.8 mag were detected in the V, R and I-bands. The X-ray data (0.2-10 keV) do not reveal significant variability on a 4 day time scale, favoring reprocessed inverse-Compton over synchrotron radiation in this band. The characteristic variability time scales in radio and optical bands are similar. A quasi-periodic variation (QPO) of 0.9 - 1.1 days in the optical data may be present, but if so it is marginal and limited to 2.2 cycles. Cross-correlatio...

  19. Novel insights from hybrid LacI/GalR proteins: family-wide functional attributes and biologically significant variation in transcription repression

    E-Print Network [OSTI]

    Meinhardt, Sarah; Manley Jr., Michael W.; Becker, Nicole A.; Hessman, Jacob A.; Maher III, L. James; Swint-Kruse, Liskin

    2012-09-08T23:59:59.000Z

    The coding regions for full-length LacI and the LacI-11 variant were subcloned from the genome of DH5a E. coli to the plasmid pHG165c. LacI-11 has a stop codon that is inserted 11 amino acids from the 30-end of the gene, which disrupts the tetramerization.... The duration of the growth assays ranged from #2;500 to 1500min. At the end of the assay for one slow-growing lactose culture, pH of the media was tested and found to be close to the starting pH. Time to OD600=1 was determined by linear regression of the data...

  20. 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...

  1. ROSAT/ASCA Observations of a Serendipitous BL Lac Object PKS 2316-423: The Variable High-Energy Tail of Synchrotron Radiation

    E-Print Network [OSTI]

    Sui-Jian Xue; You-Hong Zhang; Jian-Sheng Chen

    2000-05-22T23:59:59.000Z

    We present the analysis of archival data from ROSAT and ASCA of a serendipitous BL Lac object PKS 2316-423. Because of its featureless non-thermal radio/optical continuum, PKS 2316-423 has been called as a BL Lac candidate in the literature. PKS 2316-423 was evidently variable over the multiple X-ray observations, in particular, a variable high-energy tail of the synchrotron radiation is revealed. The X-ray spectral analysis provides further evidence of the synchrotron nature of its broad-band spectrum: a steep and downward curving spectrum between 0.1--10 keV, typical of high-energy peaked BL Lacs (HBL). The spectral energy distribution (SED) through radio-to-X-ray yields the synchrotron radiation peak at frequency Vp=7.3 10^{15} Hz, with integrated luminosity of Lsyn=2.1 10^{44} ergs s^{-1}. The averaged SED properties of PKS 2316-423 are very similar to those ``intermediate'' BL Lac objects (IBL) found recently in several deep surveys, such as Deep X-ray Radio Blazar, Radio-Emitting X-ray, and ROSAT-Green Bank surveys. We suggest that PKS 2316-423 is an IBL though it also shows some general features of a HBL. Actually, this double attribute of PKS 2316-423 provides a good test of the prediction that an IBL object can show either synchrotron or inverse-Compton characteristics in different variability states.

  2. X-Ray Luminosity and Spectral Variability in the TEV BL Lac 1ES2344+514

    E-Print Network [OSTI]

    P. Giommi; P. Padovani; E. Perlman

    1998-02-02T23:59:59.000Z

    The results of a series of five \\sax observations of the TeV BL Lac object 1ES2344+514 are briefly presented. Large amplitude luminosity variability, associated to impressive spectral changes in the hard X-rays, have been found. The shape of the lightcurve depends on energy, with the flare starting and ending in the hard band, but with maximum intensity possibly reached earlier in the soft X-rays. The luminosity and spectral changes may be due to a shift of the peak of the synchrotron emission from the soft X-rays to the hard X-ray band similar to that detected during \\sax observations of MKN 501.

  3. A kpc-scale X-ray jet in the BL Lac source S5 2007+777

    E-Print Network [OSTI]

    Rita M. Sambruna; Davide Donato; C. C. Cheung; F. Tavecchio; L. Maraschi

    2008-05-07T23:59:59.000Z

    X-ray jets in AGN are commonly observed in FRII and FRI radio-galaxies, but rarely in BL Lacs, most probably due to their orientation close to the line of sight and the ensuing foreshortening effects. Only three BL Lacs are known so far to contain a kpc-scale X-ray jet. In this paper, we present the evidence for the existence of a fourth extended X-ray jet in the classical radio-selected source S5 2007+777, which for its hybrid FRI/II radio morphology has been classified as a HYMOR (HYbrid MOrphology Radio source). Our Chandra ACIS-S observations of this source revealed an X-ray counterpart to the 19"-long radio jet. Interestingly, the X-ray properties of the kpc-scale jet in S5 2007+777 are very similar to those observed in FRII jets. First, the X-ray morphology closely mirrors the radio one, with the X-rays being concentrated in the discrete radio knots. Second, the X-ray continuum of the jet/brightest knot is described by a very hard power law, with photon index Gamma_x~1, although the uncertainties are large. Third, the optical upper limit from archival HST data implies a concave radio-to-X-ray SED. If the X-ray emission is attributed to IC/CMB with equipartition, strong beaming (delta=13) is required, implying a very large scale (Mpc) jet. The beaming requirement can be somewhat relaxed assuming a magnetic field lower than equipartition. Alternatively, synchrotron emission from a second population of very high-energy electrons is viable. Comparison to other HYMOR jets detected with Chandra is discussed, as well as general implications for the origin of the FRI/II division.

  4. Evolutionary Robotics, Anticipation and the Reality Gap Cedric Hartland and Nicolas Bred`eche

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    , partial hardware and/or software failure, medium and long lasting changes in the environment, etc. Our. The anticipation module is able to build a partial model of the simulated environment and, once in the real world computational resources. As a consequence, optimization is usually performed in a simulated environment

  5. Are both BL Lacs and pulsar wind nebulae the astrophysical counterparts of IceCube neutrino events?

    E-Print Network [OSTI]

    P. Padovani; E. Resconi

    2014-06-10T23:59:59.000Z

    IceCube has recently reported the discovery of high-energy neutrinos of astrophysical origin, opening up the PeV (10^15 eV) sky. Because of their large positional uncertainties, these events have not yet been associated to any astrophysical source. We have found plausible astronomical counterparts in the GeV -- TeV bands by looking for sources in the available large area high-energy gamma-ray catalogues within the error circles of the IceCube events. We then built the spectral energy distribution of these sources and compared it with the energy and flux of the corresponding neutrino. Likely counterparts include mostly BL Lacs and two Galactic pulsar wind nebulae. On the one hand many objects, including the starburst galaxy NGC 253 and Centaurus A, despite being spatially coincident with neutrino events, are too weak to be reconciled with the neutrino flux. On the other hand, various GeV powerful objects cannot be assessed as possible counterparts due to their lack of TeV data. The definitive association between high-energy astrophysical neutrinos and our candidates will be significantly helped by new TeV observations but will be confirmed or disproved only by further IceCube data. Either way, this will have momentous implications for blazar jets, high-energy astrophysics, and cosmic-ray and neutrino astronomy.

  6. Detection of Exceptional X-Ray Spectral Variability in the TeV BL Lac 1ES 2344+514

    E-Print Network [OSTI]

    P. Giommi; P. Padovani; E. Perlman

    1999-07-27T23:59:59.000Z

    We present the results of six BeppoSAX observations of 1ES 2344+514, five of which were taken within a week. 1ES 2344+514, one of the few known TeV BL Lac objects, was detected by the BeppoSAX Narrow Field Instruments between 0.1 to \\~50 keV. During the first five closely spaced observations 1ES 2344+514 showed large amplitude luminosity variability, associated with spectacular spectral changes, particularly when compared to the last observation when the source was found to be several times fainter, with a much steeper X-ray spectrum. The energy dependent shape of the lightcurve and the spectral changes imply a large shift (factor of 30 or more in frequency) of the peak of the synchrotron emission. At maximum flux the peak was located at or above 10 keV, making 1ES 2344+514 the second blazar (after MKN501) with the synchrotron peak in the hard X-ray band. The shift, and the corresponding increase in luminosity, might be due to the onset of a second synchrotron component extending from the soft to the hard X-ray band where most of the power is emitted. Rapid variability on a timescale of approximately 5000 seconds has also been detected when the source was brightest.

  7. The Long Term Optical Variability of the BL Lac object S5 0716+714: Evidence for a Precessing Jet

    E-Print Network [OSTI]

    R. Nesci; E. Massaro; C. Rossi; S. Sclavi; M. Maesano; F. Montagni

    2005-06-08T23:59:59.000Z

    We present the historic light curve of the BL Lac object S5 0716+714, spanning the time interval from 1953 to 2003, built using Asiago archive plates and our recent CCD observations, together with literature data. The source shows an evident long term variability, over which well known short term variations are superposed. In particular, in the period from 1961 to 1983 the mean brightness of S5 0716+714 remained significantly fainter than that observed after 1994. Assuming a constant variation rate of the mean magnitude we can estimate a value of about 0.11 magnitude/year. The simultaneous occurrence of decreasing ejection velocities of superluminal moving components in the jet reported by Bach et al. (2005) suggests that both phenomena are related to the change of the direction of the jet to the line of sight from about 5 to 0.7 degrees for an approximately constant bulk Lorentz factor of about 12. A simple explanation is that of a precessing relativistic jet, which should presently be close to the smallest orientation angle. One can therefore expect in the next ten years a decrease of the mean brightness of about 1 magnitude.

  8. The Intra-Night Optical Variability of the bright BL Lac object S5 0716+714

    E-Print Network [OSTI]

    F. Montagni; A. Maselli; E. Massaro; R. Nesci; S. Sclavi; M. Maesano

    2005-12-19T23:59:59.000Z

    We address the topic of the Intra-Night Optical Variability of the BL Lac object S5 0716+714. To this purpose a long term observational campaign was performed, from 1996 to 2003, which allowed the collection of a very large data set, containing 10,675 photometric measurements obtained in 102 nights. The source brightness varied in a range of about 2 mag, although the majority of observations were performed when it was in the range 13.0 < R < 13.75. Variability time scales were estimated from the rates of magnitude variation, which were found to have a distribution function well fitted by an exponential law with a mean value of 0.027 mag/h, corresponding to an e-folding time scale of the flux tau_F = 37.6 h. The highest rates of magnitude variation were around 0.10--0.12 mag/h and lasted less than 2 h. These rates were observed only when the source had an R magnitude < 13.4, but this finding cannot be considered significant because of the low statistical occurrence. The distribution of tau_F has a well defined modal value at 19 h. Assuming the recent estimate of the beaming factor delta about 20, we derived a typical size of the emitting region of about 5 times 10^{16}/(1 + z) cm. The possibility to search for a possible correlation between the mean magnitude variation rate and the long term changes of the velocity of superluminal components in the jet is discussed.

  9. Disentangling the synchrotron and Inverse Compton variability in the X-ray emission of the intermediate BL Lac object S5 0716+71

    E-Print Network [OSTI]

    E. Ferrero; S. J. Wagner; D. Emmanoulopoulos; L. Ostorero

    2006-07-24T23:59:59.000Z

    The possibility to detect simultaneously in the X-ray band the synchrotron and Inverse Compton (IC)emission of intermediate BL Lac objects offers the unique opportunity to study contemporaneously the low- and high-energy tails of the electron distribution in the jets of these sources. We attempted to disentangle the X-ray spectral variability properties of both the low- and high-energy ends of the synchrotron and Inverse Compton emission of the intermediate BL Lac object S5 0716+71. We carried out spectral, temporal and cross-correlation analyses of the data from a long XMM-Newton pointing of S5 0716+71 and we compared our findings with previous results from past X-ray observations. Strong variability was detected during the XMM exposure.Both the synchrotron and Inverse Compton components were found to vary on time scales of hours, implying a size of the emitting region of $R\\la 0.7\\delta /(1+z)$ light-hours. The synchrotron emission was discovered to become dominant during episodes of flaring activity, following a harder-when-brighter trend. Tight correlations were observed between variations in different energy bands. Upper limits on time lags between the soft and hard X-ray light curves are of the order of a few hundred seconds.

  10. Detection of TeV Gamma-Rays from the BL Lac 1ES1959+650 in its low states and during a major outburst in 2002

    E-Print Network [OSTI]

    Aharonian, F A; Borst, H G; Bojahr, H; Bolz, O; Coarasa, T; Contreras, J L; Cortina, J; Denninghoff, S; Fonseca, M V; Girma, M; Gtting, N; Heinzelmann, G; Hermann, G; Heusler, A; Hofmann, W; Horns, D; Jung, I; Kankanyan, R; Kestel, M; Kohnle, A; Konopelko, A; Kornmeyer, H; Kranich, D; Lampeitl, H; Lpez, M; Lorenz, E; Lucarelli, F; Mang, O; Meyer, H; Mirzoyan, R; Moralejo, A; Oa-Wilhelmi, E; Panter, M; Plyasheshnikov, A V; Phlhofer, G; De los Reyes, R; Rhode, W; Ripken, G; Robrade, J; Rowell, G; Sahakian, V V; Samorski, M; Schilling, M; Siems, M; Sobzynska, D; Stamm, W; Tluczykont, M; Vitale, V; Vlk, H J; Wiedner, C A; Wittek, W

    2003-01-01T23:59:59.000Z

    TeV gamma-rays from the BL Lac object 1ES1959+650 have been measured during the years 2000 and 2001 with a significance of 5.2 sigma at a value of 5.3% of the Crab flux and in May 2002 during strong outbursts with > 23 sigma at a flux level of up to 2.2 Crab, making 1ES1959+650 the TeV Blazar with the third best event statistics. The deep observation of 197.4 h has been performed with the HEGRA stereoscopic system of 5 imaging atmospheric Cherenkov telescopes (IACT system). 1ES1959+650 is located at a redshift of z = 0.047, providing an intermediate distance between the nearby Blazars Mkn 421 and Mkn 501, and the much more distant object H1426+428. This makes 1ES1959+650 an important candidate of the class of TeV Blazars in view of the absorption of TeV photons by the diffuse extragalactic background radiation (DEBRA). The differential energy spectrum of 1ES1959+650 during the flares can be well described by a power law with an exponential cut-off at (4.2 (+0.8 -0.6)_stat +- 0.9_sys) TeV and a spectral index ...

  11. Perplexing correlations between Gamma-ray emission and parsec-scale jet orientation variations in the BL Lac object S5 0716+714

    E-Print Network [OSTI]

    Rani, B; Marscher, A P; Jorstad, S G; Hodgson, J A; Fuhrmann, L; Zensus, J A

    2015-01-01T23:59:59.000Z

    The analysis of $\\gamma$-ray flux variability along with the parsec-scale jet kinematics suggests that the high-energy radiation in the BL Lac object S5 0716+714 has a significant correlation with the mm-VLBI core flux density and with the local orientation of the inner jet flow. For the first time in any blazar, we report a significant correlation between the $\\gamma$-ray flux variations and the variations in the local orientation of the jet outflow (position angle). We find that the $\\gamma$-ray flux variations lead the 7~mm VLBI core flux variations by 82$\\pm$32~days, which suggests that the high-energy emission in S5 0716+714 is coming from a region located 3.8$\\pm$1.9~parsecs closer to the central black hole than the "core" seen on the mm-VLBI images. The results imply a strong physical and casual connection between $\\gamma$-ray emission and the inner jet morphology in the source.

  12. The BL Lac objects OQ 530 and S5 0716+714. Simultaneous observations in the X-rays, radio, optical and TeV bands

    E-Print Network [OSTI]

    G. Tagliaferri; M. Ravasio; G. Ghisellini; P. Giommi; E. Massaro; R. Nesci; G. Tosti; M. F. Aller; H. D. Aller; A. Celotti; L. Maraschi; F. Tavecchio; A. Wolter

    2003-01-07T23:59:59.000Z

    We present the results of the BeppoSAX observations of two BL Lacs, OQ 530 and S5 0716+714, as part of a ToO program for the simultaneous observation at radio, optical, X-ray and TeV energies. Both sources are detected in the LECS and MECS, with S5 0716+714 visible also in the PDS band, up to about 60 keV. The X-ray spectra of both sources are better fitted by a double power-law model, with a steep soft X-ray component flattening at harder energies, with breaks at 0.3 and 1.5 keV, respectively. The concave shape of the spectra in both objects is consistent with soft X-rays being produced by the synchrotron and harder X-rays by the inverse Compton processes. Also the X-ray variability properties confirm this scenario, in particular for S5 0716+714 our observation shows variations by about a factor 3 over one hour below 3 keV and no variability above. Their simultaneous broad band energy spectral distributions can be successfully interpreted within the frame of a homogeneous synchrotron and inverse Compton model, including a possible contribution from an external source of seed photons with the different spectral states of S5 0716+714 being reproduced by changing the injected power. The resulting parameters are fully consistent with the two sources being intermediate objects within the "sequence" scenario proposed for blazars.

  13. Space-VLBI Polarimetry of the BL Lac Object S5 0716+714: Rapid Polarization Variability in the VLBI core

    E-Print Network [OSTI]

    U. Bach; T. P. Krichbaum; A. Kraus; A. Witzel; J. A. Zensus

    2006-03-31T23:59:59.000Z

    To determine the location of the intra-day variable (IDV) emission region within the jet of the BL Lac object S5 0716+714, a multi-epoch VSOP polarization experiment was performed in Autumn 2000. To detect, image, and monitor the short term variability of the source, three space-VLBI experiments were performed with VSOP at 5 GHz, separated in time by six days and by one day. Quasi-contemporaneous flux density measurements with the Effelsberg 100 m radio telescope during the VSOP observations revealed variability of about 5% in total intensity and up to 40% in linear polarization in less than one day. Analysis of the VLBI data shows that the variations are located inside the VLBI core component of 0716+714. In good agreement with the single-dish measurements, the VLBI ground array images and the VSOP images, both show a decrease in the total flux density of ~20 mJy and a drop of ~5 mJy in the linear polarization of the VLBI core. During the observing interval, the polarization angle rotated by about 15 degrees. No variability was found in the jet. The high angular-resolution VSOP images are not able to resolve the variable component and set an upper limit of <0.1 mas to the size of the core component. From the variability timescales we estimate a source size of a few micro-arcseconds and brightness temperatures exceeding 10^15 K. We discuss the results in the framework of source-extrinsic (interstellar scintillation induced) and source-intrinsic IDV models.

  14. Hubble Space Telescope imaging and ground-based spectroscopy of old nova shells - I. FH Ser, V533 Her, BT Mon, DK Lac, V476 Cyg

    E-Print Network [OSTI]

    C. D. Gill; T. J. O'Brien

    2000-01-06T23:59:59.000Z

    In this paper we report on the first five out of eleven observations in our programme of Hubble Space Telescope (HST) imaging of old nova shells. We present new WFPC2 images of the shells around FH Ser and V533 Her taken in the F656N (Halpha+[NII]) filter. We also show long-slit spectra taken using the William Herschel Telescope (WHT) in La Palma for these objects in the same spectral range. The shell around FH Ser is found to be a prolate ellipsoid of ellipticity 1.3 +/- 0.1 inclined at 62 +/- 4 deg to the line of sight. The shell has an equatorial ring which is found to be due to increased emission in the two [NII] lines rather than Halpha. The expansion velocity, systemic velocity and distance are found to be 490 +/- 20 km/s, -45 km/s and 950 +/- 50 pc. The origin of the [NII] equatorial ring is discussed in the context of a photoionization feature resulting from aspherical illumination by the central source rather than a simple density enhancement. It is possible however that the ring is also in part due to an extremely localised increase in the nitrogen abundance. Similar imaging and spectroscopy of the nova V533 Her reveal a shell of radius 5 +/- 0.7 arcsec with an axial ratio of 1.2 +/- 0.2, expansion velocity of 850 +/- 150 km/s and distance 1250 +/- 300 pc. The shells around BT Mon, DK Lac and V476 Cyg were not detected with HST.

  15. Lac Courte Oreilles Hydro Dam Assessment

    SciTech Connect (OSTI)

    Weaver, Jason [Lac Courte Oreilles; Meyers, Amy [Kiser Hydro

    2014-12-31T23:59:59.000Z

    The main objective of this project was to investigate upgrading the existing hydro power generating system at the Winter Dam. The tribe would like to produce more energy and receive a fair market power purchase agreement so the dam is no longer a drain on our budget but a contributor to our economy. We contracted Kiser Hydro, LLC Engineering for this project and received an engineering report that includes options for producing more energy with cost effective upgrades to the existing turbines. Included in this project was a negotiation of energy price sales negotiations.

  16. E CO LAC | 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 JumpConceptual Model,DOE FacilityDimondale,South, NewDyer County, Tennessee: EnergySolar EnergyCOE CO

  17. Mille Lacs Energy Cooperative | 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 SiteofEvaluatingGroup |JilinLu anMicrogreen Polymers Inc Jump to:JumpMidwest

  18. Volume 34 Number 9,May 5,1988 Victoria to match donations

    E-Print Network [OSTI]

    Farrell, Anthony P.

    Investments; RobertH. Lee, Prosper0 International Realty Inc.; Hartland MacDougall, Chairman of Royal Trust some tennis game the

  19. The young active star SAO 51891 (V383 Lac)

    E-Print Network [OSTI]

    Biazzo, Katia; Marilli, Ettore; Covino, Elvira; Alcala', Juan M; Cakirli, Omur; Klutsch, Alexis; Meyer, Michael R

    2009-01-01T23:59:59.000Z

    Our aim is investigating surface inhomogeneities of the young late-type star SAO51891, from photosphere to upper chromosphere, analyzing contemporaneous high-resolution spectra and broad-band photometry. The FOCES@CAHA spectral range is used to determine spectral classification and derive vsini and Vrad. The Li abundance is measured to estimate the age. The BVRIJHKs bands are used to construct the SED. The variations of our BV fluxes and Teff are used to infer the presence of photospheric spots and observe their behavior over time. The chromospheric activity is studied applying the spectral subtraction technique to Halpha, CaII H&K, Heps, and CaII IRT lines. We find SAO51891 to be a young K0-1V star with Li abundance close to the Pleiades upper envelope, confirming its youth (~100 Myr), also inferred from its kinematical membership to the Local Association. We detect no IR excess from SED analysis, and rotational modulation of luminosity, Teff, CaII, and Heps total fluxes. A spot model with two active reg...

  20. Supporting Information Saturation of LacI with model constructs

    E-Print Network [OSTI]

    Herschlag, Dan

    helices or hybrid DNA/RNA helices 2,3 . The base paring ability of 6-MI can be tested by thermal melting and 6-MI in selected DNA and RNA duplexes were measured and summarized in Table S2. Samples (1 M) were-controlled housing at 15. Repetitive pulsed laser excitation (Coherent Mira Titanium-Sapphire laser, frequency

  1. access system lacs: Topics by E-print Network

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

    Electric Power Management Systems (EPMS) and Supervisory Control and Data Acquisition (SCADA) systems that allows us to calculate device vulnerability and help power substation...

  2. Pc-scale study of Radio galaxies & BL Lacs

    E-Print Network [OSTI]

    P. Kharb; P. Shastri; D. C. Gabuzda

    2003-01-06T23:59:59.000Z

    We study two aspects of the differences between Active Galactic Nuclei (AGN) of the two Fanaroff-Riley types in order to investigate the causes of the F-R divide. We (a) contrast the properties of the optical cores in beamed and unbeamed AGN of the two types, incorporating Hubble Space Telescope measurements of the unbeamed objects, and (b) contrast the nuclear magnetic field geometry of the beamed AGN of the two types using Very Long Baseline Polarimetry.

  3. Dominican Republic-Regional Programme for LAC: Support for the...

    Open Energy Info (EERE)

    of regional and global partners." Program Focus The program will focus on reducing poverty and inequality, strengthening democratic governance, increasing disaster preparedness...

  4. Costa Rica-Regional Programme for LAC: Preparation of Sectoral...

    Open Energy Info (EERE)

    of regional and global partners." Program Focus The program will focus on reducing poverty and inequality, strengthening democratic governance, increasing disaster preparedness...

  5. Comments of Mille Lacs Energy Cooperative | Department of Energy

    Office of Environmental Management (EM)

    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 1,006 492 742 33 1112011AT&T, Inc.'sEnergyTexas1. FeedstockCLEANSpringsNational BroadbandCrowComments

  6. File:(131112) Presentacion LAC LEDs.pdf | 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 JumpConceptual Model,DOEHazelPennsylvania:57427°,Ferry County,Glass Buttes Area(131112) Presentacion

  7. LAC Regional Platform Workshop Agenda | 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 YouKizildere I Geothermal Pwer Plant Jump to: navigation, search GEOTHERMALTexas:Kuju Kanko HotelKwitherbee'sGarde

  8. LAC Regional Platform Workshop General Information | 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: navigation, search GEOTHERMALTexas:Kuju Kanko

  9. LAC Regional Platform Workshop Links | 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 YouKizildere I Geothermal Pwer Plant Jump to: navigation, search GEOTHERMALTexas:Kuju KankoAnnouncement Agenda Participant

  10. LAC Regional Platform Workshop Participant Package | 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: navigation, search GEOTHERMALTexas:Kuju KankoAnnouncement Agenda

  11. Fond du Lac County, Wisconsin: Energy Resources | 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 are8COaBulkTransmissionSitingProcess.pdf Jump to:ar-80m.pdfFillmoreGabbs Valley Area(Sasada, 1988) |FluorEnergyNewFond

  12. Hydration of a low-alkali CEM III/B-SiO{sub 2} cement (LAC)

    SciTech Connect (OSTI)

    Lothenbach, Barbara, E-mail: barbara.lothenbach@empa.ch [Empa, Laboratory for Concrete and Construction Chemistry, CH-8600 Duebendorf (Switzerland); Le Saout, Gwenn; Ben Haha, Mohsen; Figi, Renato [Empa, Laboratory for Concrete and Construction Chemistry, CH-8600 Duebendorf (Switzerland); Wieland, Erich [PSI, Laboratory for Waste Management, CH-5232 Villigen PSI (Switzerland)

    2012-02-15T23:59:59.000Z

    The hydration of a low-alkali cement based on CEM III/B blended with 10 wt.% of nanosilica has been studied. The nanosilica reacted within the first days and 90% of the slag reacted within 3.5 years. C-S-H (Ca/Si {approx} 1.2, Al/Si {approx} 0.12), calcite, hydrotalcite, ettringite and possibly straetlingite were the main hydrates. The pore water composition revealed ten times lower alkali concentrations than in Portland cements. Reducing conditions (HS{sup -}) and a pH value of 12.2 were observed. Between 1 month and 3.5 years of hydration more hydrates were formed due to the ongoing slag reaction but no significant differences in the composition of the pore solution or solid phase assemblage were observed. On the basis of thermodynamic calculations it is predicted that siliceous hydrogarnet could form in the long-term and, in the presence of siliceous hydrogarnet, also thaumasite. Nevertheless, even after 3.5 year hydration, neither siliceous hydrogarnet nor thaumasite have been observed.

  13. The Periplasmic Cavity of LacY Mutant Cys154 -> Gly: How Open Is Open?

    E-Print Network [OSTI]

    Jiang, X; Driessen, AJM; Feringa, BL; Kaback, HR

    2013-01-01T23:59:59.000Z

    GroEL-GroES- mediated protein folding. Chem. Rev. 106, 1917of chaperone-mediated protein folding in the cytosol. Nat.that impair membrane protein folding and generate a membrane

  14. Fond du Lac Band Leads Climate Resilience Efforts on Lake Superior...

    Office of Environmental Management (EM)

    journey gardens. Continue reading the blog on the White House Council on Environmental Quality website. Additional Reading Materials Native Leaders Give Tribes a Voice on White...

  15. Power Spectral Distribution of the BL Lac Object S5 0716+714

    E-Print Network [OSTI]

    Mocanu, G R

    2012-01-01T23:59:59.000Z

    Observational data in the BVRI bands of the variable BL Lacertae Object S5 0716+714 is discussed from the point of view of its Power Spectral Distribution (PSD). A model of the type $P(f) = \\beta f^{-1} [1 + (\\frac{f} {\\delta}) ^{\\alpha -1}]^{-1} + \\gamma $ is fitted to the data for four null hypothesis and the Bayesian $p$ parameter for the fits is calculated. Spectral slopes with values ranging from 1.083 to 2.65 are obtained, with medium values for each band of $\\bar{\\alpha}_B =2.028$, $\\bar{\\alpha}_V = 1.809$, $\\bar{\\alpha}_R = 1.932$ and $\\bar{\\alpha}_I = 1.54$ respectively. These values confirm conclusions of previous studies, namely that the source is turbulent. Two disk models, the standard prescription of the Shakura-Sunyaev disk and magnetized disks exhibiting MagnetoRotational Instability, were discussed. We found that it is unlikely that they explain this set of observational data.

  16. Optical Monitoring of BL Lac Object S5 0716+714 with High Temporal Resolution

    E-Print Network [OSTI]

    Jianghua Wu; Bo Peng; Xu Zhou; Jun Ma; Zhaoji Jiang; Jiansheng Chen

    2005-01-11T23:59:59.000Z

    Optical monitoring of S5 0716+714 was performed with a 60/90 Schmidt telescope in 2003 November and December and 2004 January for studying the variability of the object on short timescales. Due to the high brightness of the source we could carry out quasi-simultaneous measurements in three bands with a temporal resolution of about 20 minutes by using one single telescope. Intraday and intranight variations were observed with an overall change of ~0.9 mag during the whole campaign. Two outbursts were recorded on JD 2453005 and JD 2453009. Minimum timescales of a few hours were derived from the light curves of individual nights but were different from night to night. A bluer-when-brighter chromatism was present when the object was in fast flare, but was absent when it was in a relatively quiescent state. Our results are basically consistent with the shock-in-jet model and demonstrate that the geometrical effects can sometimes play an important role in the variability of blazars.

  17. For further details: Please refer to the ERANet-LAC website

    E-Print Network [OSTI]

    joint activities and by establishing an innovative and sustainable framework for future bi- regional

  18. Harmonic QPOs and Thick Accretion Disk Oscillations in BL Lac Object AO 0235+164

    E-Print Network [OSTI]

    F. K. Liu; G. Zhao; Xue-Bing Wu

    2006-06-27T23:59:59.000Z

    Periodic outbursts are observed in many AGNs and usually explained with a supermassive black hole binary (SMBHB) scenario. However, multiple periods are observed in some AGNs and cannot be explained with it. Here we analyze the periodicity of the radio light curves of AO 0235+164 at multi-frequencies and report the discovery of six QPOs in integer ratio 1:2:3:4:5:6 of QPO frequencies, of which the second with period $P_2 = (5.46 \\pm 0.47) {\\rm yr}$ is the strongest. We fit the radio light curves and show that the initial phases of six QPOs have zero or $\\pi$ differences relative to each other. We suggest a harmonic relationship of QPOs. The centroid frequency, relative strength, harmonic relationship and relative initial phases of QPOs are independent of radio frequency. The harmonic QPOs are likely due to the quasi-periodic injection of plasma from an oscillating accretion disk into the jet. We estimate the supermassive black hole mass $M_{\\rm BH} \\simeq (4.72\\pm 2.04) \\times 10^8 M_\\odot$ and the accretion rate $\\dot{m}\\simeq 0.007$. With the knowledge of accretion disk, it implies that the inner region of accretion disk of AO 0235+164 is a radiatively inefficient accretion flow. The oscillation accretion is due to the p-mode oscillation of the thick disk probably excited by a SMBHB. The theoretical predications of fundamental oscillation frequency and the harmonics are well consistent with the observations. Harmonic QPOs would be absent when the thick disk becomes geometrically thin due to the increase of accretion rate. We discuss the observations of AO 0235+164 basing on the SMBHB-thick disk oscillation scenario.

  19. Fond du Lac Band Leads Climate Resilience Efforts on Lake Superior Chippewa

    Energy Savers [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 directed offOCHCO2: FinalOffers3.pdf0-45.pdf Flash2010-45.pdfFlash2011-43andProperty ControlFollow-up

  20. LEDSGP/about/Latin America and Caribbean Regional Platform/LAC Regional

    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: navigation, searchLEDSGP/Transportation Toolkit/ToolsInformationPlatform

  1. LEDSGP/about/Latin America and Caribbean Regional Platform/LAC Regional

    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: navigation, searchLEDSGP/Transportation

  2. Costa Rica-Regional Programme for LAC: Preparation of Sectoral LEDs for

    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 EnergyInnovationinConcentratingEnergyCoosa ValleyCorsicanaproject

  3. Dominican Republic-Regional Programme for LAC: Support for the Preparation

    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 SiteofEvaluating A Potential MicrohydroDistrict of Columbia: EnergyDobreveStrategyBiomassof

  4. Dominican Republic-Regional Programme for LAC: Support for the Preparation

    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 SiteofEvaluating A Potential MicrohydroDistrict of Columbia: EnergyDobreveStrategyBiomassofof

  5. YidC protein, a molecular chaperone for LacY protein folding via the SecYEG protein machinery

    E-Print Network [OSTI]

    Zhu, L; Kaback, HR; Dalbey, RE

    2013-01-01T23:59:59.000Z

    GroEL-GroES- mediated protein folding. Chem. Rev. 106, 1917of chaperone-mediated protein folding in the cytosol. Nat.that impair membrane protein folding and generate a membrane

  6. Optical and radio variability of the BL Lac object AO 0235+16: a possible 5-6 year periodicity

    E-Print Network [OSTI]

    C. M. Raiteri; M. Villata; H. D. Aller; M. F. Aller; J. Heidt; O. M. Kurtanidze; L. Lanteri; M. Maesano; E. Massaro; F. Montagni; R. Nesci; K. Nilsson; M. G. Nikolashvili; P. Nurmi; L. Ostorero; T. Pursimo; R. Rekola; A. Sillanpaa; L. O. Takalo; H. Terasranta; G. Tosti; T. J. Balonek; M. Feldt; E. J. McGrath; A. Heines; C. Heisler; J. Hu; M. Kidger; J. R. Mattox; A. Pati; R. Robb; A. C. Sadun; P. Shastri; S. J. Wagner; J. Wei; X. Wu

    2001-08-09T23:59:59.000Z

    New optical and radio data on the BL Lacertae object AO 0235+16 have been collected in the last four years by a wide international collaboration, which confirm the intense activity of this source. The optical data also include the results of the Whole Earth Blazar Telescope (WEBT) first-light campaign organized in November 1997. The optical spectrum is observed to basically steepen when the source gets fainter. We have investigated the existence of typical variability time scales and of possible correlations between the optical and radio emissions by means of visual inspection, Discrete Correlation Function analysis, and Discrete Fourier Transform technique. The major radio outbursts are found to repeat quasi-regularly with a periodicity of about 5.7 years; this period is also in agreement with the occurrence of some of the major optical outbursts, but not all of them.

  7. Modeling nuclei of radio galaxies from VLBI radio observations. Application to the BL Lac Object S5 1803+784

    E-Print Network [OSTI]

    J. Roland; S. Britzen; N. A. Kudryavtseva; A. Witzel; M. Karouzos

    2008-05-19T23:59:59.000Z

    We present a new method to fit the variations of both coordinates of a VLBI component as a function of time, assuming that the nucleus of the radio source contains a binary black hole system (BBH system). The presence of a BBH system produces 2 perturbations of the trajectory of the ejected VLBI components. By using only the VLBI coordinates, the problem we have to solve reduces to an astrometric problem. Knowledge of the variations of the VLBI coordinates as a function of time contains the kinematical information, thus we are able to deduce the inclination angle of the source and the bulk Lorentz factor of the ejected component. Generally, there is a family of the BBH system producing the same fit to our data. To illustrate this method, we apply it to the source 1807+784. We find that the inclination of the source is i = 5.8+-1.8 degrees and the VLBI component is ejected with a bulk Lorentz factor of 3.7+-0.3. We determine the family of the BBH system which provides the best fit, assuming at first that the masses of the 2 black holes are equal and then that the masses are different. Each family of BBH systems is characterized by Tp/Tb~1.967, where Tp and Tb are the precession period of the accretion disk of the black hole ejecting the VLBI component and the orbiting period of the BBH system.

  8. L'ANTHROPOLOGIE GENETIQUE ET LA QUESTION DE LA CITOYENNETE DANS LA REGION DES GRANDS LACS (RWANDA -BURUNDI)

    E-Print Network [OSTI]

    Paris-Sud XI, Universit de

    factions. Le conflit engag concerne le droit la citoyennet, vivre sur la terre de cette rgion

  9. INSTITUTIONAL REVIEW BOARD LAC+USC Medical Center, General Hospital Suite 4700, 1200 N. State Street, Los Angeles, CA 90033

    E-Print Network [OSTI]

    Valero-Cuevas, Francisco

    , MPH; Robert A. Larsen, MD; Linda Sher, MD Member Name, Gender Highest Degree Primary Scientific Larsen, Robert M MD Infectious Diseases Y USC Faculty 10 Sher, Linda F MD Surgery Y USC Faculty 11 Spicer PharmD Pharmacy Y USC Faculty 1,3,4,5,8,9,10,11 14 Lewis, Keith M MD Pediatrics Y USC Faculty 1

  10. QUASI-PERIODIC OSCILLATIONS OF {approx}15 MINUTES IN THE OPTICAL LIGHT CURVE OF THE BL LAC S5 0716+714

    SciTech Connect (OSTI)

    Rani, Bindu; Gupta, Alok C. [Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, Nainital 263 129 (India); Joshi, U. C.; Ganesh, S. [Physical Research Laboratory, Navrangpura, Ahmedabad 380 009 (India); Wiita, Paul J., E-mail: binduphysics@gmail.co [Department of Physics, College of New Jersey, P.O. Box 7718, Ewing, NJ 08628 (United States)

    2010-08-20T23:59:59.000Z

    Over the course of 3 hr on 2008 December 27, we obtained optical (R band) observations of the blazar S5 0716+714 at a very fast cadence of 10 s. Using several different techniques, we find fluctuations with an approximately 15 minute quasi-period to be present in the first portion of these data at a >3{sigma} confidence level. This is the fastest quasi-periodic oscillation that has been claimed to be observed in any blazar at any wavelength. While these data are insufficient to strongly constrain models for such fluctuations, the presence of such a short timescale when the source is not in a very low state seems to favor the action of turbulence behind a shock in the blazar's relativistic jet.

  11. B and I-band optical micro-variability observations of the BL Lac objects S5 2007+777 and 3C371

    E-Print Network [OSTI]

    E. M. Xilouris; I. E. Papadakis; P. Boumis; A. Dapergolas; J. Alikakos; J. Papamastorakis; N. Smith; C. D. Goudis

    2005-11-04T23:59:59.000Z

    We have observed S5 2007+777 and 3C371 in the B and I bands for 13 and 8 nights, respectively, during various observing runs in 2001, 2002 and 2004. The observations resulted in almost evenly sampled light curves, 6-9 hours long. We do not detect any flares within the observed light curves, but we do observe small amplitude, significant variations, in both bands, on time scales of hours and days. The average variability amplitude on time scales of minutes/hours is 2.5% and 1-1.5% in the case of S5 2007+777 and 3C371, respectively. The average amplitudes increase to 5-12% and 4-6%, respectively, on time scales of days. We find that the B and I band variations are highly correlated, on both short and long time scales. During the 2004 observations, which resulted in the longest light curves, we observe two well defined flux-decay and rising trends in the light curves of both objects. When the flux decays, we observe significant delays, with the B band flux decaying faster than the flux in the I band. As a result, we also observe significant, flux related spectral variations as well. The flux-spectral relation is rather complicated, with loop-like structures forming during the flux evolution. The presence of spectral variations imply that the observed variability is not caused by geometric effects. On the other hand, our results are fully consistent with the hypothesis that the observed variations are caused by perturbations which affect different regions in the jet of the sources.

  12. USC HEALTH SCIENCES CAMPUS INSTITUTIONAL REVIEW BOARD LAC+USC Medical Center, General Hospital Suite 4700, 1200 N. State Street, Los Angeles, CA 90033

    E-Print Network [OSTI]

    Biederman, Irving

    Chairs: Deirdre Anglin, MD, MPH; Robert A. Larsen, MD; Linda Sher, MD Member Name, Gender Highest Degree Faculty 9 Kim, Jiwon F PharmD Pharmacy Y USC Faculty 10 Lewis, Keith M MD Pediatrics Y USC Faculty 11-Scientific / Prisoner Representative N Non-Affiliated 1, 4, 5 12 Larsen, Robert M MD Infectious Diseases Y USC Faculty 2

  13. ESI/TOF Measurements of a Noncovalent Complex between Lactose Repressor Protein (LacI) and Double-Stranded DNA Containing its Specific Operator Sequence

    E-Print Network [OSTI]

    Ens, Werner

    M buffer solution. Initial attempts to observe the protein tetramer were unsuccessful (as in the case rather broad peaks for both dimer and tetramer. The tetramer appears in two separate envelopes, suggesting that the the charge states 20 to 22 between m/z 7000 and 8000 represent the native tetramer

  14. LesbassinsvaporitiquesMichelSranne Michel Sranne

    E-Print Network [OSTI]

    Demouchy, Sylvie

    eustatique Salars Lacs intra-montagneux Playa + cnes alluviaux Plate-forme (carbonate) Salina Bassin

  15. Lightning Arrestor Connectors Production Readiness

    SciTech Connect (OSTI)

    Marten, Steve; Linder, Kim; Emmons, Jim; Gomez, Antonio; Hasam, Dawud; Maurer, Michelle

    2008-10-20T23:59:59.000Z

    The Lightning Arrestor Connector (LAC), part M, presented opportunities to improve the processes used to fabricate LACs. The A## LACs were the first production LACs produced at the KCP, after the product was transferred from Pinnellas. The new LAC relied on the lessons learned from the A## LACs; however, additional improvements were needed to meet the required budget, yield, and schedule requirements. Improvement projects completed since 2001 include Hermetic Connector Sealing Improvement, Contact Assembly molding Improvement, development of a second vendor for LAC shells, general process improvement, tooling improvement, reduction of the LAC production cycle time, and documention of the LAC granule fabrication process. This report summarizes the accomplishments achieved in improving the LAC Production Readiness.

  16. Harvard, Massachusetts: Energy Resources | 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, search OpenEI ReferenceJumpEnergyStrategy | OpenHalfWindHartland Wind Farm

  17. Harvest BioFuels LLC | 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, search OpenEI ReferenceJumpEnergyStrategy | OpenHalfWindHartland Wind FarmHarvest

  18. Harvest Energy | 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, search OpenEI ReferenceJumpEnergyStrategy | OpenHalfWindHartland Wind

  19. Harvest II | 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, search OpenEI ReferenceJumpEnergyStrategy | OpenHalfWindHartland WindHarvest II

  20. Harvest Wind Farm I | 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, search OpenEI ReferenceJumpEnergyStrategy | OpenHalfWindHartland WindHarvest

  1. Harvest Wind Farm II | 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, search OpenEI ReferenceJumpEnergyStrategy | OpenHalfWindHartland

  2. Haslet, Texas: Energy Resources | 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, search OpenEI ReferenceJumpEnergyStrategy | OpenHalfWindHartlandHaslet, Texas:

  3. Hasselbach Meats | 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, search OpenEI ReferenceJumpEnergyStrategy | OpenHalfWindHartlandHaslet,

  4. Hastings Public Schools Wind Project | 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, search OpenEI ReferenceJumpEnergyStrategy | OpenHalfWindHartlandHaslet,Hastings

  5. Mutational analysis of the lambda S gene

    E-Print Network [OSTI]

    Neal, Gregory Scott

    1984-01-01T23:59:59.000Z

    , the early stages of gene expression 1n the lytic cycle are not germane to this d1scussion. Late protein synthes1s is programmed from transcr1pts initiated at a single promoter, Pr'. This promoter is controlled by termination at the term1nator trz, and 1t... p JG13 pJH2 pZ150 pZ152 pGN200 pGN201 CSH57B met+ lacIQI lacZ+ ~tr + su- CQ21 F'~ro lacIQI lacZ Tn5 (PI) F'tra036, proAB+, lacZm15, lacI/ a~lac ro, thi, strtr, endA, ~scB15, , ~su E AmpR TetR lacPO (in pBR322) AmpR lacPO Sam7 R+Rz+ (in p...

  6. En toute libert30 Jeudi 15 juin 2006 L'invit de la semaine: Guy Priat

    E-Print Network [OSTI]

    Bureau de conseil suisse de pche Fiber, situ au bord du lac des Quatre- Cantons, ct de Lucerne

  7. Atmos. Chem. Phys., 10, 219237, 2010 www.atmos-chem-phys.net/10/219/2010/

    E-Print Network [OSTI]

    Meskhidze, Nicholas

    -light absorbing carbon (LAC) particles play a major role in climate change (Jacobson, 2002; Bond, 2007; Levy et al indicators show a prominent thinly-coated BC mode over the Mexico City Metropolitan Area (MCMA), while older et al., 2006a). The mixing state of LAC is also important from a climate change perspective, as LAC

  8. Identification of extragalactic sources of the highest energy EGRET photons by correlation analysis

    E-Print Network [OSTI]

    D. S. Gorbunov; P. G. Tinyakov; I. I. Tkachev; S. V. Troitsky

    2005-05-30T23:59:59.000Z

    We found significant correlations between the arrival directions of the highest energy photons (E>10 GeV) observed by EGRET and positions of the BL Lac type objects (BL Lacs). The observed correlations imply that not less than three per cent of extragalactic photons at these energies originate from BL Lacs. Some of the correlating BL Lacs have no counterparts in the EGRET source catalog, i.e. do not coincide with strong emitters of gamma-rays at lower energy. The study of correlating BL Lacs suggests that they may form a subset which is statistically different from the total BL Lac catalog; we argue that they are prominent candidates for TeV gamma-ray sources. Our results demonstrate that the analysis of positional correlations is a powerful approach indispensable in cases when low statistics limits or even prohibits the standard case-by-case identification.

  9. Energy Efficiency and Conservation Block Grant Program

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

    and Indian tribes . The Mille Lacs Band would hire a professional energy auditing finn (Sustainable Engineering Group LLC) to conduct energy audits of the main tribal government...

  10. CX-004607: Categorical Exclusion Determination | Department of...

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

    Block Grant Program. The Mille Lacs Band would hire a professional energy auditing firm (Sustainable Engineering Group LLC) to conduct energy audits of the main tribal government...

  11. A case study on the influence of THM coupling on the near field safety of a spent fuel repository in sparsely fractured granite

    E-Print Network [OSTI]

    Nguyen, T.S.

    2009-01-01T23:59:59.000Z

    Damage of Lac du Bonnet Granite in triaxial tests, Proc.in sparsely fractured granite Thanh Son Nguyen 1* , Lennartand calibration of the granite and bentonite behaviour, both

  12. JOURNAL OF BACTERIOLOGY, 0021-9193/99/$04.00 0

    E-Print Network [OSTI]

    Walter, Peter

    ) have also reported PilA control of pilC in N. meningitidis with a lacZ reporter system, which implies

  13. Data:A0fee6a1-2aa1-4217-9458-cb95314b2738 | Open Energy Information

    Open Energy Info (EERE)

    ADJUSTMENT In accordance with the Corporate Code, Business License System and Employment Rights Law contained in the Fond du Lac Reservation Ordinance 584, businesses...

  14. antepartum pituitary necrosis: Topics by E-print Network

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

    of proestrus, at the onset of the proestrous surge administration of OT results in PRL release (21, 22), an effect mediated by pituitary lac- totrophs because OT Bertram,...

  15. CX-006083: Categorical Exclusion Determination | Department of...

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

    Exclusion Determination CX-006083: Categorical Exclusion Determination Ground Source Heat Pump Installation - Lac Qui Parle County Courthouse, Minnesota CX(s) Applied: B5.1 Date:...

  16. Shock-less interactions of ablation streams in tungsten wire array z-pinches

    SciTech Connect (OSTI)

    Swadling, G. F.; Lebedev, S. V.; Hall, G. N.; Suzuki-Vidal, F.; Burdiak, G.; Harvey-Thompson, A. J.; Bland, S. N.; De Grouchy, P.; Khoory, E.; Pickworth, L.; Skidmore, J.; Suttle, L. [The Blackett Laboratory, Imperial College, London SW7 2AZ (United Kingdom)] [The Blackett Laboratory, Imperial College, London SW7 2AZ (United Kingdom)

    2013-06-15T23:59:59.000Z

    Shock-less dynamics were observed during the ablation phase in tungsten wire array experiments carried out on the 1.4 MA, 240 ns MAGPIE generator at Imperial College London. This behaviour contrasts with the shock structures which were seen to dominate in previous experiments on aluminium arrays [Swadling et al., Phys. Plasmas 20, 022705 (2013)]. In this paper, we present experimental results and make comparisons both with calculations of the expected mean free paths for collisions between the ablation streams and with previously published Thomson scattering measurements of the plasma parameters in these arrays [Harvey-Thompson et al., Phys. Plasmas 19, 056303 (2012)].

  17. A B C D E F G H A B C D E F G H

    E-Print Network [OSTI]

    Rohs, Remo

    UKC CHP HC2 HSV ZNI ISC NRT HC4 KMC CSA CSC CCC LAC + USC Outpatient Facility LAC + USC Inpatient Teaching and Research E5 CCC Child Care Center G4 CHP Center for the Health Professions F3 CLB Clinical Floor F4 CHP CHP Executive Conference, Room 102 F3 CSC Harkness Assembly, Room 250 H3 HC4 USC Healthcare

  18. UHP Parking A B C D E F G H

    E-Print Network [OSTI]

    Leahy, Richard M.

    CSB TRC CHP HCT CPT HSV ZNI ISC NRT DEI UNH CSA CSB CSC CCC NIT LAC + USC Outpatient Facility LAC Credit Union SRH ATM E4 E4 E4 UNH ATM G3 CHP ATM F3 Auditoriums & Conference Centers HMR Hastings Auditorium, Room 100 CHP CHP Executive Conference, Room 102 DEI Conference Center, Room 3200 DOH Doheny

  19. KMC Parking A B C D E F G H

    E-Print Network [OSTI]

    Rohs, Remo

    UKC CHP HC2 HSV ZNI ISC NRT HC4 KMC CSA CSC CCC LAC + USC Outpatient Facility LAC + USC Inpatient Bishop Medical Teaching and Research E5 CCC Child Care Center G4 CHP Center for the Health Professions F3 Floor F4 CHP CHP Executive Conference, Room 102 F3 CSC Harkness Assembly, Room 250 H3 HCF USC Healthcare

  20. BINDING INSTRUCTIONS FOR MASTER'S AND PHD PROGRAMS General Instructions

    E-Print Network [OSTI]

    Northern British Columbia, University of

    -5244 Facsimile: (250) 960-5362 World Wide Web: www.unbc.ca FORM:GR301 #12;For Dissertations & Theses and Graduate Programs. If the student's Abstract is over the following word limit, the student must condense their abstract just for the LAC submission to the following word limit and attach a copy to the LAC forms: 150

  1. Latin american and caribbean StudieS

    E-Print Network [OSTI]

    Dresden, Gregory

    209 Latin american and caribbean StudieS (LacS) cOre FacuLtY: Professor barnett AssociAte Professor MAyock AssistAnt Professors BottA, cArey, Dickovick, eAstwooD the Program in Latin american and caribbean, culture, and society as applied to the region of Latin America and the caribbean. the program's curriculum

  2. Latin American and Caribbean Studies

    E-Print Network [OSTI]

    Saldin, Dilano

    Latin American and Caribbean Studies Certificate About Us UWM graduates in the 21st century American and Caribbean Studies Certificate Program (LACS) will be especially well-prepared for careers academic focus in Latin American and Caribbean languages, histories, and cultures. However, the LACS

  3. Computer Science Specimen Curriculum City University Hong Kong, China

    E-Print Network [OSTI]

    Simaan, Nabil

    Computer Science Specimen Curriculum City University Hong Kong, China Spring Semester Junior Year Communications 3 CS 3103 (CS 281) Operating Systems Principles 3 CS 250 Algorithms 3 CS DEPTH Computer Science Depth 6 CS 270 Programming Languages 3 LAC Liberal Arts Core 3 CS DEPTH Computer Science Depth 3 15 LAC

  4. Computer Science Specimen Curriculum City University Hong Kong, China

    E-Print Network [OSTI]

    Simaan, Nabil

    Computer Science Specimen Curriculum City University Hong Kong, China Fall Semester Junior Year) Algorithms 3 CS 281 Operating System Principles 3 OPEN ELEC Open Elective 3 CS PROJ Computer Science Project 3 CS DEPTH Computer Science Depth 3 CS DEPTH Computer Science Depth 3 LAC Liberal Arts Core 3 LAC

  5. PROGRAMA INSTITUCIONAL DE BOLSAS PIBIC/PIBITI -INPE/CNPq

    E-Print Network [OSTI]

    / LAC Dr. Jos Carlos Becceneri CTE/LAC Dr. Cludio Solano Pereira CPT / DMD Dr. Fabiano Lus de Sousa ETE / DMC Dr. Joaquim Jos Barroso de Castro CTE / LAP Dr. Jonas Rodrigues de Souza CEA / DAE Dra. Maria Cristina Forti CCST Comit Externo do CNPq Comisso Julgadora Prof. Dr. Armando

  6. Direktion des Innern Amt fr Wald und Wild

    E-Print Network [OSTI]

    Wehrli, Bernhard

    Direktion des Innern Amt für Wald und Wild Veranstaltungsreihe Forum Wild "Projet Lac Zugersee" Im Zug Aabachstrasse 5, Zug Veranstaltungsreihe Forum Wild "Projet Lac Zugersee" Im August 2013 hat ein, Zug Direktion des Innern Amt für Wald und Wild #12;

  7. CX-001634: Categorical Exclusion Determination

    Broader source: Energy.gov [DOE]

    Meteorological Tower Installation Mille Lacs Band of Ojibwa Indian ReservationCX(s) Applied: B3.1, A9Date: 04/08/2010Location(s): County of Mille Lacs, MinnesotaOffice(s): Energy Efficiency and Renewable Energy, Golden Field Office

  8. Rheostats and Toggle Switches for Modulating Protein Function

    E-Print Network [OSTI]

    Meinhardt, Sarah; Manley Jr., Michael W.; Parente, Daniel J.; Swint-Kruse, Liskin

    2013-12-30T23:59:59.000Z

    the coding region for LLhP on the pHG165 vector, using the QuikChange protocol (Table S1 in Data S1). LGhP comprises LacI 145, GalR 4459, and PurR 60341. For dimeric LacI (LacI-11) and all chimeras, linker variants were constructed via site... the family of 14 synthetic LacI/GalR proteins [17] and dimeric LacI [34] (Table 1), we compared and contrasted the functional outcomes for .1000 variants at nonconserved linker positions 46, 48, 50, 51, 52, 54, 55, 58, 59, 60, 61, and 62. These positions have...

  9. Understanding government and railroad strategy for crude oil transportation in North America

    E-Print Network [OSTI]

    Carlson, S. Joel (Stephen Joel)

    2014-01-01T23:59:59.000Z

    On July 6, 2013, an oil-laden unit train derailed and exploded in Lac-Megantic, Quebec, Canada, killing 47 people, shocking and saddening many, and leading to significantly increased public scrutiny of crude oil transported ...

  10. CX-002687: Categorical Exclusion Determination | Department of...

    Office of Environmental Management (EM)

    reservation lands in Forest County, Fond du Lac County and Milwaukee County. Solar photovoltaic units with a capacity of 18.9 kilowatts will be installed on the Forest County...

  11. Original article Lactose hydrolysing ability of sonicated cultures

    E-Print Network [OSTI]

    Paris-Sud XI, Universit de

    , or a 30% lac- tose or whey permeate solutions. Freezing point changes were used to measure the progress- meate solution and the hydrolysis rate was acceptable at a low temperature (7 o C) in skim milk

  12. Alaska whitefish were more or less distended and crammed with eggs, almost all ofthem least cisco

    E-Print Network [OSTI]

    are important components ofthe sport fishery resources of the Chatanika River, the matter is worth further and distribution of lake whitefish in Lac la Ronge, Saskatchewan. Trans. Am. Fish. Soc. 90:303- 307. SLACK, H. D

  13. CX-003491: Categorical Exclusion Determination | Department of...

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

    Department of Energy to refurbish and upgrade generator components of the Fond du Lac Hydro Facility in Minnesota. DOCUMENT(S) AVAILABLE FOR DOWNLOAD CX-003491.pdf More Documents...

  14. analysis codes evaluation: Topics by E-print Network

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

    - TxSpace Summary: with UOz Fue. Although the reactor appears to be well within thermal safety mar. gins, lac'x of a detailed pellet-clad mechanica inter action model and...

  15. area telescope multiwavelength: Topics by E-print Network

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

    observations CERN Preprints Summary: Context. We present the discovery of very high energy (VHE, E > 100GeV) gamma-ray emission from the BL Lac object 1ES 1215+303 by the MAGIC...

  16. Leading the Charge: Native Leaders Give Tribes a Voice on White...

    Office of Environmental Management (EM)

    Vision of the Future? That each Tribe can move toward energy reduction andor energy production that respects its own traditions. -Chwmn. Karen Diver, Fond du Lac Band of Lake...

  17. IFEL ATF 10-06-10.pptx

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

    Cost E st. Off---the s helf S LAC---type l inac 20 M Vm 35 m Low 5 m m Proven technology Not practical for mobile platform applications Not cheap Novel linac...

  18. High density growth of T7 expression strains with auto-induction option

    DOE Patents [OSTI]

    Studier, F. William (Stony Brook, NY)

    2010-07-20T23:59:59.000Z

    A bacterial growth medium for promoting auto-induction of transcription of cloned DNA in cultures of bacterial cells grown batchwise is disclosed. The transcription is under the control of a lac repressor. Also disclosed is a bacterial growth medium for improving the production of a selenomethionine-containing protein or polypeptide in a bacterial cell, the protein or polypeptide being produced by recombinant DNA techniques from a lac or T7lac promoter, the bacterial cell encoding a vitamin B12-dependent homocysteine methylase. Finally, disclosed is a bacterial growth medium for suppressing auto-induction of expression in cultures of bacterial cells grown batchwise, said transcription being under the control of lac repressor.

  19. Dynamic formation of extreme ozone minimum events over the Tibetan Plateau during northern winters 19872001

    E-Print Network [OSTI]

    Chance, Kelly

    Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China. 2 Also at Graduate University of Chinese Academy of Sciences, Beijing, China. 3 LACS, Institute of Atmospher

  20. The highly conserved MraZ protein is a transcriptional regulator...

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

    promoter containing three direct repeats to regulate its own expression and that of downstream cell division and cell wall genes. MraZ-LacZ fusions are repressed by excess MraZ...

  1. White House Climate Task Force Tribal Leaders Listening Session

    Office of Energy Efficiency and Renewable Energy (EERE)

    On Wednesday, February 12, Karen Diver, Chairwoman of the Fond du Lac Band of Lake Superior Chippewa, and Reggie Joule, Mayor of Alaskas Northwest Arctic Borough, both of whom are members of...

  2. I!OU!, RECIPIENT:NREL

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

    a physical address of 43282 Timber Trail Rd , Onamia, MN 56359. The Ledin Site is a Brownfield site recently purchased by the Mille Lacs Band of Ojibwa and is part of U.S....

  3. Differentiation of normal and cancerous lung tissues by multiphoton imaging

    E-Print Network [OSTI]

    Wang, Chun-Chin

    We utilize multiphoton microscopy for the label-free diagnosis of noncancerous, lung adenocarcinoma (LAC), and lung squamous cell carcinoma (SCC) tissues from humans. Our results show that the combination of second-harmonic ...

  4. CAL/ACEP Joins CAL/AAEM and UC Irvine in Sponsoring the Western Journal of Emergency Medicine

    E-Print Network [OSTI]

    Mallon, William K.; Swadron, Stuart P

    2009-01-01T23:59:59.000Z

    Department of Emergency Medicine, LAC+USC Medical Center,Journal of Emergency Medicine Volume X, no . 3 : NovemberWestern Journal of Emergency Medicine William K. Mallon, MD*

  5. Diagnosing collisions of magnetized, high energy density plasma flows using a combination of collective Thomson scattering, Faraday rotation, and interferometry (invited)

    SciTech Connect (OSTI)

    Swadling, G. F., E-mail: swadling@imperial.ac.uk; Lebedev, S. V.; Hall, G. N.; Patankar, S.; Stewart, N. H.; Smith, R. A.; Burdiak, G. C.; Grouchy, P. de; Skidmore, J.; Suttle, L.; Suzuki-Vidal, F.; Bland, S. N.; Kwek, K. H.; Pickworth, L.; Bennett, M.; Hare, J. D. [Plasma Physics Group, Imperial College, London SW6 7LZ (United Kingdom); Harvey-Thompson, A. J. [Sandia National Laboratory, Albuquerque, New Mexico 87185-1193 (United States); Rozmus, W. [Department of Physics, University of Alberta, Edmonton, Alberta T6G 2J1 (Canada); Yuan, J. [Key Laboratory of Pulsed Power, Institute of Fluid Physics, CAE, Mianyang 621900 (China)

    2014-11-15T23:59:59.000Z

    A suite of laser based diagnostics is used to study interactions of magnetised, supersonic, radiatively cooled plasma flows produced using the Magpie pulse power generator (1.4 MA, 240 ns rise time). Collective optical Thomson scattering measures the time-resolved local flow velocity and temperature across 714 spatial positions. The scattering spectrum is recorded from multiple directions, allowing more accurate reconstruction of the flow velocity vectors. The areal electron density is measured using 2D interferometry; optimisation and analysis are discussed. The Faraday rotation diagnostic, operating at 1053 nm, measures the magnetic field distribution in the plasma. Measurements obtained simultaneously by these diagnostics are used to constrain analysis, increasing the accuracy of interpretation.

  6. Intranight optical variability of radio-quiet BL Lacertae objects

    E-Print Network [OSTI]

    Liu, Yuan; Zhang, Shuang Nan

    2015-01-01T23:59:59.000Z

    Aims: The intranight variation (or microvariation) is a common phenomenon of radio-loud BL Lac objects. However, it is not clear whether the recently found radio-quiet BL Lac objects have the same properties. The occurrence rate of intranight variation is helpful in distinguishing the mechanism of the continuum of radio-quiet BL Lac objects. Methods: We conducted a photometric monitoring of 8 radio-quiet BL Lac objects by Xinglong 2.16m and Lijiang 2.4m telescopes. The differential light curves are calculated between each target and two comparison stars. To qualify the variation, the significance of variation is examined by scaled $F$-test. Results: No significant variation is found in the 11 sessions of light curves of 8 radio-quiet BL Lac objects (one galactic source is excluded). The lack of microvariation in radio-quiet BL Lac objects is consistent with the detection rate of microvariation in normal radio-quiet AGNs, but much lower than that of radio-loud AGNs. This result indicates that the continua of t...

  7. The Broad Band Spectral Energy Distributions of SDSS Blazars

    E-Print Network [OSTI]

    Li, Huaizhen; Jiang, Yunguo; Yi, Tingfeng

    2015-01-01T23:59:59.000Z

    We compiled the radio, optical, and X-ray data of blazars from the Sloan Digital Sky Survey (SDSS) database, and presented the distribution of luminosities and broad band spectral indices. The distribution of luminosities shows that the averaged luminosity of flat-spectral radio quasars (FSRQs) is larger than that of BL Lacs objects. On the other hand, the broad band spectral energy distribution reveals that FSRQs and low energy peaked BL Lac objects (LBLs) objects have similar spectral properties, but high energy peaked BL Lac objects (HBLs) have a distinct spectral property. This may be due to that different subclasses of blazars have different intrinsic environments and are at different cooling levels. Even so, a unified scheme also is revealed from the color-color diagram, which hints that there are similar physical processes operating in all objects under a range of intrinsic physical conditions or beaming parameter.

  8. HST Observations of BL Lacertae Environments

    E-Print Network [OSTI]

    J. E. Pesce; C. M. Urry; M. O'Dowd; R. Scarpa; R. Falomo; A. Treves

    1999-08-31T23:59:59.000Z

    We analyze images of BL Lacertae objects obtained with the {\\it Hubble Space Telescope} WFPC2 and the F814W filter. The nine objects cover a redshift range of 0.19 to 0.997. The relatively deep images are sufficient to detect galaxies at least one magnitude below M$^{*}_{I}$ (--21.4) and in most cases to three magnitudes below M$^{*}$. Galaxy enhancement over the average background is found around four out of the nine objects. Results for some cases are confirmed by ground-based imaging. In the other cases, the redshifts of the target BL Lac objects may be incorrect or they are truly isolated. These findings reinforce the idea that on average, BL Lac objects are found in regions of above average galaxy density. However, isolated objects apparently can host BL Lac nuclei too, a result that has implications for the processes that trigger/fuel the nuclear activity.

  9. Analysis of insertion mutants in the Escherichia coli fertility factor F transfer genes: traY, traQ, trbA, trbB and artA

    E-Print Network [OSTI]

    Kathir, Pushpa Rani

    1989-01-01T23:59:59.000Z

    and donor strains carrying both a tra::kan insertion construct and either Flee or pOX38 43 6 Qualitative mating and bacteriophage sensitivity S R + R tests of Tc Km Lac Nal XK1200 transconjugants deri~ed from Flac/pKI238 donors 45 7 Qualitative mating... and bacteriophage sensitivity S R + R tests of Tc Km Lac Nal XK1200 transconjugants derived from Flac/pKI239 donors 47 8 Southern hybridization pattern of Flac and Fl N323 8-5 DNA p t*d ' 8 pK118 1 NNA 9 Quantitative mating and complementation tests Fl t tt238...

  10. Growth and maintenance of the mouse adrenal cortex

    E-Print Network [OSTI]

    Chang, Su-Ping

    2008-01-01T23:59:59.000Z

    and death have been identified. Several models for stem cell maintenance of the adult adrenal cortex have been proposed, but adrenocortical stem cells have not yet been identified. Adrenal cortices of 21OH/LacZ transgenic mice show similar mosaic patterns...

  11. mersibles rus e scientifiq

    E-Print Network [OSTI]

    Wehrli, Bernhard

    tâche en enviro un portra environne Les micro L'un des une large contamin santé du de la ma. Ce u lac. Grâce fonds, le mations pou onoraire de de sensibi portes le 4 ses, françai l'impact

  12. Molecular Cell Mode of Regulation and the Insulation

    E-Print Network [OSTI]

    Molecular Cell Article Mode of Regulation and the Insulation of Bacterial Gene Expression Vered.molcel.2012.04.032 SUMMARY A gene can be said to be insulated from environ- mental variations if its the insulation of the lac promoter of E. coli and of synthetic constructs in which the transcription factor CRP

  13. CX-004608: Categorical Exclusion Determination

    Broader source: Energy.gov [DOE]

    Chippewa Tribe of Minnesota on behalf of the Mille Lacs Band Renewable Energy Technologies on Government BuildingsCX(s) Applied: B3.6, B5.1Date: 01/08/2010Location(s): Tower, MinnesotaOffice(s): Energy Efficiency and Renewable Energy

  14. BIO VIEWBIO VIEWT A K A R A B I O E U R O P E E D I T I O N

    E-Print Network [OSTI]

    Lebendiker, Mario

    manual cat info Ideal for Efficient Soluble Protein Expression using E. coli promoter of csp. An efficient protein production system is essential to study these subjects. Expression systems in E. coli. This product is based on the promoter of a cold-shock gene cspA, down- stream of which the lac operator, the 5

  15. On Storage Operators LAMA -Equipe de Logique

    E-Print Network [OSTI]

    Nour, Karim

    On Storage Operators Karim NOUR LAMA - Equipe de Logique Universit´e de Savoie 73376 Le Bourget du Lac e-mail nour@univ-savoie.fr Abstract In 1990 Krivine (1990b) introduced the notion of storage shown that there is a very simple type in the AF2 type system for storage operators using Godel

  16. S-STORAGE OPERATORS Karim NOUR 1

    E-Print Network [OSTI]

    Nour, Karim

    S-STORAGE OPERATORS Karim NOUR 1 LAMA - Equipe de Logique, Universit´e de Savoie - 73376 Le Bourget du Lac cedex 2 Abstract In 1990, J.L. Krivine introduced the notion of storage operator to simulate define, for every -term S which realizes the successor function on Church integers, the notion of S-storage

  17. Thermodynamic mechanism for inhibition of lactose permease by the phosphotransferase protein IIAGlc.

    E-Print Network [OSTI]

    Hariharan, P; Balasubramaniam, D; Peterkofsky, A; Kaback, HR; Guan, L

    2015-01-01T23:59:59.000Z

    ?S Permease LacY MelB ?S mix ?S solv ?S conf ?T?S ?T?Smix (J/molK) ?T?S solv ?T?S conf (kJ/mol) *?C p = ?H/?T,solvation entropy change (?S solv ) is associated with the

  18. NATIONAL RADIO ASTRONOMY OBSERVATORY Green Bank, West Virginia

    E-Print Network [OSTI]

    Groppi, Christopher

    tests made on the 750 Mc and the 1410 Mc systems which were installed on the 300-foot telescope transition, 7 1/2 feet of : RG--9 coaxial cable, and a RF Products 48 VDC coaxial relay), were installed LAC-3 mixer- preamplifier. Test results of the parametric amplifier are covered in Internal Report No

  19. Acclimation rate and resistance to lethal temperatures of 20-35 mm striped mullet, Mugil cephalus Linnaeus, at various salinities

    E-Print Network [OSTI]

    Pfeiffer, Gerald Patrick

    1971-01-01T23:59:59.000Z

    more populations. 18 MATERIALS AND METHODS Source of Fish 0 February 28. 1971, app u ' at ly4, 999~lac il c~ea 1 were captured on the west beach of Galveston Island. There were two sites of capture and two methods of capture. Station 1...

  20. FYI: July 6, 1995 - December 7, 1995

    E-Print Network [OSTI]

    1995-01-01T23:59:59.000Z

    to be given to John Committee members read all reports Marathon LAC meetings to make 1 st cut Next Meetings: Jui. 05 Jui. 12 Jui. 19 lOam - noon lOam - noon 1:30pm page 4 University of Kansas Libraries Number 1327 July 13, 1995 ASSOCIATE DEAN...

  1. Proceedings of the Workshop: ``Xray spectroscopy of AGN with Chandra and XMMNewton'' held in Garching, December 36, 2001 eds. Th. Boller, S. Komossa, S. Kahn, H. Kunieda, MPE Report, pp.

    E-Print Network [OSTI]

    Boettcher, Markus

    and timing analysis of BL Lacertae in 2000 M. Bottcher 1 , H. D. Aller 2 , M. F. Aller 2 , O. Mang 3 , C. M powerlaw commonly observed in radioloud quasars and radioselected BL Lac objects is seen. From

  2. Line map construction based on small-scale mobile robot using single-sonar navigation

    E-Print Network [OSTI]

    Jaradat, Mohammad Abdel Kareem

    2002-01-01T23:59:59.000Z

    HI STRONG PEAKS PARAMETERS FOR THE SECOND EXPERIMENT -20 90' 180 11 -25 Plg. 35. TI1C 1lAC Bop OA (AC R&%1A tlBASfOffA gCOfACtTQ . CHAPTER V CONCLUSION AND FUTURE WORK In this study a line map construction approach has been presented...

  3. A 2007 Model Curriculum for a Liberal Arts Degree in Computer Science

    E-Print Network [OSTI]

    Metaxas, Takis

    A 2007 Model Curriculum for a Liberal Arts Degree in Computer Science Liberal Arts Computer Science Consortium February 25, 2007 In 1986, guidelines for a computer science major degree program offered in the context of the liberal arts were developed by the Liberal Arts Computer Science Consortium (LACS) [4

  4. Computer Science Specimen Curriculum National University of Singapore

    E-Print Network [OSTI]

    Simaan, Nabil

    Computer Science Specimen Curriculum National University of Singapore Fall Semester Junior Year Science Project 3 CS DEPTH Computer Science Depth 3 CS DEPTH Computer Science Depth 3 LAC Liberal Arts MATH ELEC Math Elective 3 CS DEPTH Computer Science Depth 6 CS DEPTH Computer Science Depth 6 OPEN ELEC

  5. Universit europenne d't 2005 "Val de Loire -patrimoine mondial" Tours-Angers-Nantes 26 au 30 septembre 2005 Le patrimoine culturel et industriel du Bas-Uruguay (Argentine,

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    septembre 2005 1 Le patrimoine culturel et industriel du Bas-Uruguay (Argentine, Uruguay) : typologie (Uruguay) Courriel : rboretto@adinet.com.uy Zone fluviale frontalière entre l'Argentine et l'Uruguay (v. cartouche fig. 1), le Bas- Uruguay (environ 350 km du nord au sud) est délimité à l'amont par le vaste lac

  6. Facult des Lettres INSTITUT D' ETlil{OLOGIE

    E-Print Network [OSTI]

    Paris-Sud XI, Universit de

    'OIBE D' EII HHO-BOTANIQUE ET DI ETHNO-ZOOLOGIE PARIS LE COMPORTEMENT ALI~OENTAlRE DES A1~IV~UX SAUVAGES Eusum IJational d 'Histoire--Naturelle LABOiLAC[tOIJ_-U:~; D' ET'HHO-B01\\AFfIQE ET DI ETHNO

  7. YALE UNIVERSITY Summer 2014 (Summer School A)

    E-Print Network [OSTI]

    . Alejandro Ibarra-Yunez Professor of Economics and Public Policy Chair, Economics of Networks and Regulations and Europe, Latin American governments (LAC) have taken policy actions analyzed by macroeconomists and restructuring, such as in the energy sector. #12;2 I propose to follow an economic viewpoint, complemented

  8. -Volume 20, Part 1 -January 1973 C O N T E N T S

    E-Print Network [OSTI]

    Seamons, Kent E.

    BRIGHAM YOUNG ~ UNIVERSITY GEOLOGY I:g $$ . - .::i@ STUDIES -Volume 20, Part 1 -January 1973 C O N ........................ Wm. Lac Stokes 11 Geology and Im&pasib of Im SpringsDistrict, .Iron County, Utah ............................................ Kenneth C. Bulludc 27 Oil and Gas Possibilities in Southern Nevada ............ Harold J. Bissell 65

  9. ORIGINAL PAPER M. A. G. Koas R. Ramamoorthi W. A. Pine

    E-Print Network [OSTI]

    Sinskey, Anthony J.

    Sequence of the Corynebacterium glutamicum pyruvate carboxylase gene Received: 16 December 1997 / Received in Brevibacterium lac- tofermentum (Tosaka et al. 1979) and Corynebacterium glutamicum (Peters-Wendisch et al. 1997 acid production in industrial fermentations. We used regions of homology from pyruvate carboxylase se

  10. WHAT'S ALL THE STINK ABOUT DICK WOLKOWSKI

    E-Print Network [OSTI]

    Balser, Teri C.

    WHAT'S ALL THE STINK ABOUT BIOSOLIDS DICK WOLKOWSKI UW-MADISON SOIL SCIENCE Fond du Lac WWTP #12;WHAT ARE BIOSOLIDS BIOSOLIDS ARE THE BY-PRODUCTS OF THE BIOLOGICAL TREATMENT OF ORGANIC WASTES;BIOSOLIDS CATEGORIES (MUNICIPAL SEWAGE SLUDGE) MANAGED FOR: PATHOGENS HEAVY METALS VECTOR ATTRACTION

  11. Thermodynamic mechanism for inhibition of lactose permease by the phosphotransferase protein IIAGlc

    E-Print Network [OSTI]

    Hariharan, P; Balasubramaniam, D; Peterkofsky, A; Kaback, HR; Guana, L

    2015-01-01T23:59:59.000Z

    SEM, number of tests, 24. Energy (kJ/mol) cY B St La Mel5. Comparison of binding energy of IIA Glc to LacY or MelBLacY measured by resonance energy transfer. Biochemistry 45(

  12. Tyrosinase-Related Protein 2 Promoter Targets Transgene Expression to Ocular and Neural

    E-Print Network [OSTI]

    Cummings, Molly E.

    Tyrosinase-Related Protein 2 Promoter Targets Transgene Expression to Ocular and Neural Crest generated transgenic mice carrying the lacZ reporter gene linked to the tyrosinase-related protein 2 (TRP2 mutation. INTRODUCTION Tyrosinase-related protein 2 (TRP2) is an enzyme in- volved in an intermediate step

  13. CALGARY, EDMONTON AND OTHER ALBERTA FLE ENROLMENT 2001-02 2002-03 2003-04 2004-05 2005-06 2006-07 2007-08 2008-09 2009-10 2010-11 2011-12

    E-Print Network [OSTI]

    Habib, Ayman

    .9 860.4 1 020.2 1 059.6 1 088.1 1 128.1 119.4 11.8% 0.4% Portage College (Lac La Biche) 1 054.0 977.0 1

  14. CLASS 2.3: 02/20/07 BACTERIAL OPERONS

    E-Print Network [OSTI]

    Andres, Andrew

    (HTH) - 4 identical subunits make up active repressor 2 subunits 2 dimers form tetramer/Operator interactions #12;10 d. lac operon has multiple operators - Since intact Repressor is a tetramer = - are three i. O1 = - has strongest ii. O2 = iii. O3 = - O2 and O3 have - When Repressor tetramer binds

  15. RADIATION MECHANISM AND JET COMPOSITION OF GAMMA-RAY BURSTS AND GeV-TeV-SELECTED RADIO-LOUD ACTIVE GALACTIC NUCLEI

    SciTech Connect (OSTI)

    Zhang Jin; Lu Ye; Zhang Shuangnan [National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China); Liang Enwei; Sun Xiaona [Department of Physics and GXU-NAOC Center for Astrophysics and Space Sciences, Guangxi University, Nanning 530004 (China); Zhang Bing, E-mail: lew@gxu.edu.cn [Department of Physics and Astronomy, University of Nevada, Las Vegas, NV 89154 (United States)

    2013-09-01T23:59:59.000Z

    Gamma-ray bursts (GRBs) and GeV-TeV-selected radio-loud active galactic nuclei (AGNs) are compared based on our systematic modeling of the observed spectral energy distributions of a sample of AGNs with a single-zone leptonic model. We show that the correlation between the jet power (P{sub jet}) and the prompt gamma-ray luminosity (L{sub jet}) of GRBs is consistent, within the uncertainties, with the correlation between jet power and the synchrotron peak luminosity (L{sub s,jet}) of flat spectrum radio quasars (FSRQs). Their radiation efficiencies ({epsilon}) are also comparable (>10% for most sources), which increase with the bolometric jet luminosity (L{sub bol,jet}) for FSRQs and with the L{sub jet} for GRBs with similar power-law indices. BL Lac objects (BL Lacs) do not follow the P{sub jet}-L{sub s,jet} relation of FSRQs. They have lower {epsilon} and L{sub bol,jet} values than FSRQs, and a tentative L{sub bol,jet}-{epsilon} relation is also found, with a power-law index different from that of the FSRQs. The magnetization parameters ({sigma}) of FSRQs are on average larger than that of BL Lacs. They are anti-correlated with {epsilon} for the FSRQs, but positively correlated with {epsilon} for the BL Lacs. GeV narrow-line Seyfert 1 galaxies potentially share similar properties with FSRQs. Based on the analogy between GRBs and FSRQs, we suggest that the prompt gamma-ray emission of GRBs is likely produced by the synchrotron process in a magnetized jet with high radiation efficiency, similar to FSRQs. The jets of BL Lacs, on the other hand, are less efficient and are likely more matter-dominated.

  16. Solar Polarization 4 ASP Conference Series, Vol. 358, 2006

    E-Print Network [OSTI]

    Berdyugina, Svetlana

    /Ic V/Ic [mag] [km/s] [days] atoms TiO EK Dra G1 V 7.8 17 2.6 0.09 0.2 V478 Lyr G8 V SB1 7.7 21 2.15 0.12 0.1 Boo A G8 V 4.5 3 6.43 0.06 0.1 Boo B K4 V 7 0.06 0.2 EQ Vir K5 V 9.3 11 3.96 0.36 0.3 BY Dra K/M3e V 9.1 4.39 0.30 0.5 EV Lac M3.5e V 10.1 7 4.38 0.28 1.1 And G8 IV 3.9 10 53.95 0.09 0.1 HK Lac

  17. **FULL TITLE** ASP Conference Series, Vol. **VOLUME**, **YEAR OF PUBLICATION**

    E-Print Network [OSTI]

    Berdyugina, Svetlana

    Sp. class V/Ic V/Ic atoms TiO atoms TiO EK Dra G1 V 0.09 0.2 AU Mic M1 V 0.39 0.4 V478 Lyr G8 V 0.12 0.1 FK Aqr M2/M3Ve 0.30 0.5 Boo A G8 V 0.06 0.1 EV Lac M3.5Ve 0.28 1.1 Boo B K4 V 0.06 0.2 V1054 Oph M3.5Ve 0.14 0.4 61 Cyg A K5 V 0.03 0.1 And G8 IV 0.09 0.1 61 Cyg B K7 V 0.01 0.1 HK Lac K0 III 0

  18. Blazar Variability and Evolution in the GeV Regime

    E-Print Network [OSTI]

    Tsujimoto, S; Nishijima, K; Kodani, K

    2015-01-01T23:59:59.000Z

    One of the most important problem of the blazar astrophysics is to understand the physical origin of the blazar sequence. In this study, we focus on the GeV gamma-ray variability of blazars and evolution perspective we search the relation between the redshift and the variability amplitude of blazars for each blazar subclass. We analyzed the Fermi-LAT data of the TeV blazars and the bright AGNs (flux $\\geq$ 4$\\times10^{-9}$ cm$^{-2}$s$^{-1}$) selected from the 2LAC (the 2nd LAT AGN catalog) data base. As a result, we found a hint of the correlation between the redshift and the variability amplitude in the FSRQs. Furthermore the BL Lacs which have relatively lower peak frequency of the synchrotron radiation and relatively lower redshift, have a tendency to have a smaller variability amplitude.

  19. Cloning and expression of autogenes encoding RNA polymerases of T7-like bacteriophages

    DOE Patents [OSTI]

    Studier, F.W.; Dubendorff, J.W.

    1998-11-03T23:59:59.000Z

    This invention relates to the cloning and expression of autogenes encoding RNA polymerases of T7 and T7-like bacteriophages, in which the RNA polymerase gene is transcribed from a promoter which is recognized by the encoded RNA polymerase. Cloning of T7 autogenes was achieved by reducing the activity of the RNA polymerase sufficiently to permit host cell growth. T7 RNA polymerase activity was controlled by combining two independent methods: lac-repression of the recombinant lac operator-T7 promoter in the autogene and inhibition of the polymerase by T7 lysozyme. Expression systems for producing the RNA polymerases of T7 and other T7-like bacteriophages, and expression systems for producing selected gene products are described, as well as other related materials and methods. 12 figs.

  20. Cloning and expression of autogenes encoding RNA polymerases of T7-like bacteriophages

    DOE Patents [OSTI]

    Studier, F.W.; Dubendorff, J.W.

    1998-10-20T23:59:59.000Z

    This invention relates to the cloning and expression of autogenes encoding RNA polymerases of T7 and T7-like bacteriophages, in which the RNA polymerase gene is transcribed from a promoter which is recognized by the encoded RNA polymerase. Cloning of T7 autogenes was achieved by reducing the activity of the RNA polymerase sufficiently to permit host cell growth. T7 RNA polymerase activity was controlled by combining two independent methods: lac-repression of the recombinant lac operator-T7 promoter in the autogene and inhibition of the polymerase by T7 lysozyme. Expression systems for producing the RNA polymerases of T7 and other T7-like bacteriophages, and expression systems for producing selected gene products are described, as well as other related materials and methods. 12 figs.

  1. Repressor-mediated tissue-specific gene expression in plants

    DOE Patents [OSTI]

    Meagher, Richard B. (Athens, GA); Balish, Rebecca S. (Oxford, OH); Tehryung, Kim (Athens, GA); McKinney, Elizabeth C. (Athens, GA)

    2009-02-17T23:59:59.000Z

    Plant tissue specific gene expression by way of repressor-operator complexes, has enabled outcomes including, without limitation, male sterility and engineered plants having root-specific gene expression of relevant proteins to clean environmental pollutants from soil and water. A mercury hyperaccumulation strategy requires that mercuric ion reductase coding sequence is strongly expressed. The actin promoter vector, A2pot, engineered to contain bacterial lac operator sequences, directed strong expression in all plant vegetative organs and tissues. In contrast, the expression from the A2pot construct was restricted primarily to root tissues when a modified bacterial repressor (LacIn) was coexpressed from the light-regulated rubisco small subunit promoter in above-ground tissues. Also provided are analogous repressor operator complexes for selective expression in other plant tissues, for example, to produce male sterile plants.

  2. S5 1803+78 revisited

    E-Print Network [OSTI]

    Nesci, R; Montagni, F

    2012-01-01T23:59:59.000Z

    We report on our optical monitoring of the BL Lac object S5 1803+78 from 1996 to 2011. The source showed no clear periodicity, but a time scale of about 1300 days between major flares is possibly present. No systematic trend of the color index with flux variations is evident, at variance with other BL Lacs. In one flare, however, the source was bluer in the rising phase and redder in the falling one. Two Gamma-ray flares were detected by Fermi-GST during our monitoring: on the occasion of only one of them we found simultaneous optical brightening. A one-zone Synchrotron Self Compton (SSC) model appears too simple to explain the source behavior.

  3. Efficiency and versatility of distal multisite transcription regulation

    E-Print Network [OSTI]

    Leonor Saiz; Jose M. G. Vilar

    2007-04-24T23:59:59.000Z

    Transcription regulation typically involves the binding of proteins over long distances on multiple DNA sites that are brought close to each other by the formation of DNA loops. The inherent complexity of the assembly of regulatory complexes on looped DNA challenges the understanding of even the simplest genetic systems, including the prototypical lac operon. Here we implement a scalable quantitative computational approach to analyze systems regulated through multiple DNA sites with looping. Our approach applied to the lac operon accurately predicts the transcription rate over five orders of magnitude for wild type and seven mutants accounting for all the combinations of deletions of the three operators. A quantitative analysis of the model reveals that the presence of three operators provides a mechanism to combine robust repression with sensitive induction, two seemingly mutually exclusive properties that are required for optimal functioning of metabolic switches.

  4. Comparing narrow and broad-line AGNs, in a new diagnostic diagram for emission-line galaxies based on WISE data

    E-Print Network [OSTI]

    Coziol, R; Andernach, H

    2015-01-01T23:59:59.000Z

    Using a new color-color diagnostic diagram in the mid infrared built from WISE data, the MIRDD, we compare narrow emission-line galaxies (NELGs) that exhibit different activity types (star-forming galaxies, SFGs, and AGNs, i.e.,LINERs, Sy2s and TOs), with broad-line AGNs (QSOs and Sy1s) and BL Lac objects at low redshift ($z \\le 0.25$). We show that the BL Lac objects occupy in the MIRDD the same region as the LINERs, whereas the QSOs and Sy1s occupy an intermediate region, between the LINERs and the Sy2s.In the MIRDD these galaxies trace a sequence that can be reproduced by a power law, $F_\

  5. Systemic, local, and imaging biomarkers of brain injury: more needed, and better use of those already established?

    E-Print Network [OSTI]

    Carpenter, Keri L. H.; Czosnyka, Marek; Jalloh, Ibrahim; Newcombe, Virginia F. J.; Helmy, Adel; Shannon, Richard J.; Budohoski, Karol P.; Kolias, Angelos G.; Kirkpatrick, Peter J.; Carpenter, Thomas Adrian; Menon, David K.; Hutchinson, Peter J.

    2015-02-18T23:59:59.000Z

    anisotropy; FDG, 18F-fluorodeoxyglucose; FLAIR, fluid-attenuated inversion recovery; GABA, gamma-aminobutyric acid; GCS, Glas- gow coma scale score; GFAP, glial fibrillary acidic protein; GOS, Glasgow outcome scale score; GE, gradient echo; GRE, gradient... dehydrogenase; LPR, lac- tate/pyruvate ratio; MMP, matrix metalloprotease; MRI, magnetic resonance imag- ing; MRS, magnetic resonance spectroscopy; NAA, N -acetylaspartate; NAAG, N - acetylaspartylglutamate; NAD+, nicotine adenine dinucleotide (oxidized form...

  6. Energy Efficiency and Pollution Prevention: Industrial Efficiency Strategies

    E-Print Network [OSTI]

    Pye, M.; Elliott, R. N.

    . Beginning in the late 1980s, some in the industrial energy efficiency arena recognized that significant energy savings could be realized from P2 programs. Notable program examples are EPRI's (Electric Power Research Institute)2 Partnership... for Industrial Competitiveness program, and DOE's Industrial Assessment Center (lAC) program. EPRI's Partnership for Industrial Competitiveness (EPIC) program focuses on maximizing energy efficiency, pollution prevention and industrial competitiveness...

  7. The role of microorganisms in the production of volatile sulfhydryl compounds in cheddar cheese slurries

    E-Print Network [OSTI]

    Ponce-Trevino, Raul

    1988-01-01T23:59:59.000Z

    the role of lac- tic cultures on the production of volatile sulfhydryl com- pounds in the slurries. Hydrogen sulfide, methanethiol, carbonyl sulfide and dimethyl sulfide were found in the headspace of slurries prepared from curd manufactured... by the culture procedure. Addition of an antibiotic mixture to slurries prepared from curd manufactured by the culture me- thod inhibited bacteria growth and the production of hydro- gen sulfide and dimethyl sulfide. A mixture of antibiotics was added...

  8. Rms-flux relation in the optical fast variability data of BL Lacertae object S5 0716+714

    E-Print Network [OSTI]

    Mocanu, Gabriela Raluca

    2012-01-01T23:59:59.000Z

    The possibility that Bl Lac S5 0716+714 exhibits a linear rms-flux relation in its IntraDay Variability is analyzed. The results may be used as an argument in the existing debate regarding the source of optical IDV in Active Galactic Nuclei. 63 timeseries in different optical bands were used. A linear rms-flux relation at a confidence level higher than 65% was recovered for less than 8% of the cases.

  9. European Journal of Scientific Research ISSN 1450-216X Vol.56 No.4 (2011), pp.516-528

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    2011-01-01T23:59:59.000Z

    Tropicale: Cas du lac Nokoué (Bénin) Daouda Mama Corresponding Author, Laboratoire: Groupe de Recherche Eau Energies Nouvelles de l'Institut National Polytechnique Houphouët-Boigny BP 1093 Yamoussoukro Côte d'Ivoire essentiellement apportée par le fleuve Ouémé, le plus long fleuve du Bénin qui traverse le pays du nord au sud

  10. Freezing precipitation in the Southeastern United States

    E-Print Network [OSTI]

    Young, William Robert

    1978-01-01T23:59:59.000Z

    $S million W Tenn Occ 1975 Central and We, c. N Caro U. na $4 ' 5 million over $100, 000 over 5 cm on ground 16 traffic deaths worst in area in 30 year ) 4 killedc 11 injured Jan 1977 (2-3) N Texn Arkc Lac Nisse Ala and Gaa over $6... Bo D ~ F ~ General discussion . . ~ ~ ~ Surface parameters~ 1 ~ Temperature ~ . ~ ~ . . . . . . . ~ . . . ~ 2i D;w poants ~ ~ 3 ~ &inde ~ ~ e ~ ~ ~ ~ ~ 0 4 Pressure . ~ . 5~ Visibility ~ ~ ~ ~ ~ ~ ~ 0 ~ ~ ~ ~ ~ 6, Typical surface plot:s...

  11. Radiative precursors driven by converging blast waves in noble gases

    SciTech Connect (OSTI)

    Burdiak, G. C.; Lebedev, S. V.; Harvey-Thompson, A. J.; Swadling, G. F.; Suzuki-Vidal, F.; Hall, G. N.; Khoory, E.; Pickworth, L.; Bland, S. N.; Grouchy, P. de; Skidmore, J.; Suttle, L.; Bennett, M.; Niasse, N. P. L. [Blackett Laboratory, Imperial College London SW7 2BW (United Kingdom)] [Blackett Laboratory, Imperial College London SW7 2BW (United Kingdom); Williams, R. J. R. [Atomic Weapons Establishment, Aldermaston RG7 4PR (United Kingdom)] [Atomic Weapons Establishment, Aldermaston RG7 4PR (United Kingdom); Blesener, K.; Atoyan, L.; Cahill, A.; Hoyt, C.; Potter, W. [Laboratory of Plasma Studies, Cornell University, Ithaca, New York 14853 (United States)] [Laboratory of Plasma Studies, Cornell University, Ithaca, New York 14853 (United States); and others

    2014-03-15T23:59:59.000Z

    A detailed study of the radiative precursor that develops ahead of converging blast waves in gas-filled cylindrical liner z-pinch experiments is presented. The experiment is capable of magnetically driving 20?km s{sup ?1} blast waves through gases of densities of the order 10{sup ?5} g cm{sup ?3} (see Burdiak et al. [High Energy Density Phys. 9(1), 5262 (2013)] for a thorough description). Data were collected for Ne, Ar, and Xe gas-fills. The geometry of the setup allows a determination of the plasma parameters both in the precursor and across the shock, along a nominally uniform line of sight that is perpendicular to the propagation of the shock waves. Radiation from the shock was able to excite NeI, ArII, and XeII/XeIII precursor spectral features. It is shown that the combination of interferometry and optical spectroscopy data is inconsistent with upstream plasmas being in LTE. Specifically, electron density gradients do not correspond to any apparent temperature change in the emission spectra. Experimental data are compared to 1D radiation hydrodynamics HELIOS-CR simulations and to PrismSPECT atomic physics calculations to assist in a physical interpretation of the observations. We show that upstream plasma is likely in the process of being radiatively heated and that the emission from a small percentage of ionised atoms within a cool background plasma dominates the emission spectra. Experiments were carried out on the MAGPIE and COBRA pulsed-power facilities at Imperial College London and Cornell University, respectively.

  12. Looking below the floor: constraints on the AGN radio luminosity functions at low power

    E-Print Network [OSTI]

    Capetti, Alessandro

    2015-01-01T23:59:59.000Z

    We constrain the behavior of the radio luminosity function (RLF) of two classes of active galactic nuclei (AGN) namely AGN of low radio power (LRP) and BL Lac objects. The extrapolation of the observed steep RLFs to low power predicts a space density of such objects that exceeds that of the sources that can harbor them and this requires a break to a shallower slope. For LRP AGN we obtain P_br,LRP > 10^20.5 W/Hz at 1.4 GHz to limit their density to be smaller than that of elliptical galaxies with black hole masses M_BH > 10^7.5 solar masses. By combining this value with the limit derived by the observations the break must occur at P_br,LRP~10^20.5-10^21.5 W/Hz. For BL Lacs we find P_br,BLLAC > 10^23.3 W/Hz otherwise they would outnumber the density of weak-lined and compact radio sources, while the observations indicate P_br,BLLAC < 10^24.5 W/Hz. In the framework of the AGN unified model a low luminosity break in the RLF of LRP AGN must correspond to a break in the RLF of BL Lacs. The ratio between P_br,LRP...

  13. THE MICRO-ARCSECOND SCINTILLATION-INDUCED VARIABILITY (MASIV) SURVEY. III. OPTICAL IDENTIFICATIONS AND NEW REDSHIFTS

    SciTech Connect (OSTI)

    Pursimo, Tapio [Nordic Optical Telescope, Apartado 474, 38700 Santa Cruz de La Palma (Spain)] [Nordic Optical Telescope, Apartado 474, 38700 Santa Cruz de La Palma (Spain); Ojha, Roopesh [NVI Inc./U. S. Naval Observatory, 3450 Massachusetts Ave NW, Washington DC (United States)] [NVI Inc./U. S. Naval Observatory, 3450 Massachusetts Ave NW, Washington DC (United States); Jauncey, David L. [CSIRO Astronomy and Space Science and Mount Stromlo Observatory, Canberra ACT 0200 (Australia)] [CSIRO Astronomy and Space Science and Mount Stromlo Observatory, Canberra ACT 0200 (Australia); Rickett, Barney J. [Department of Electrical and Computer Engineering, University of California, San Diego, La Jolla, CA 92093 (United States)] [Department of Electrical and Computer Engineering, University of California, San Diego, La Jolla, CA 92093 (United States); Dutka, Michael S. [The Catholic University of America, 620 Michigan Ave., N.E., Washington DC 20064 (United States)] [The Catholic University of America, 620 Michigan Ave., N.E., Washington DC 20064 (United States); Koay, Jun Yi; Bignall, Hayley E.; Macquart, Jean-Pierre [ICRAR, Curtin University, Bentley, WA 6845 (Australia)] [ICRAR, Curtin University, Bentley, WA 6845 (Australia); Lovell, James E. J. [School of Mathematics and Physics, University of Tasmania, TAS 7001 (Australia)] [School of Mathematics and Physics, University of Tasmania, TAS 7001 (Australia); Kedziora-Chudczer, Lucyna, E-mail: tpursimo@not.iac.es [School of Physics and Astrophysics, UNSW, Sydney NSW 2052 (Australia)] [School of Physics and Astrophysics, UNSW, Sydney NSW 2052 (Australia)

    2013-04-10T23:59:59.000Z

    Intraday variability (IDV) of the radio emission from active galactic nuclei is now known to be predominantly due to interstellar scintillation (ISS). The MASIV (The Micro-Arcsecond Scintillation-Induced Variability) survey of 443 flat spectrum sources revealed that the IDV is related to the radio flux density and redshift. A study of the physical properties of these sources has been severely handicapped by the absence of reliable redshift measurements for many of these objects. This paper presents 79 new redshifts and a critical evaluation of 233 redshifts obtained from the literature. We classify spectroscopic identifications based on emission line properties, finding that 78% of the sources have broad emission lines and are mainly FSRQs. About 16% are weak lined objects, chiefly BL Lacs, and the remaining 6% are narrow line objects. The gross properties (redshift, spectroscopic class) of the MASIV sample are similar to those of other blazar surveys. However, the extreme compactness implied by ISS favors FSRQs and BL Lacs in the MASIV sample as these are the most compact object classes. We confirm that the level of IDV depends on the 5 GHz flux density for all optical spectral types. We find that BL Lac objects tend to be more variable than broad line quasars. The level of ISS decreases substantially above a redshift of about two. The decrease is found to be generally consistent with ISS expected for beamed emission from a jet that is limited to a fixed maximum brightness temperature in the source rest frame.

  14. Emission lines and optical continuum in low-luminosity radio galaxies

    E-Print Network [OSTI]

    K. A. Wills; R. Morganti; C. N. Tadhunter; T. G. Robinson; M. Villar-Martin

    2003-10-09T23:59:59.000Z

    We present spectroscopic observations of a complete sub-sample of 13 low-luminosity radio galaxies selected from the 2Jy sample. The underlying continuum in these sources is carefully modelled in order to make a much-needed comparison between the emission line and continuum properties of FRIs with those of other classes of radio sources. We find that 5 galaxies in the sample show a measurable UV excess: 2 of the these sources are BL Lacs and in the remaining 3 galaxies we argue that the most likely contributor to the UV excess is a young stellar component. Excluding the BL Lacs, we therefore find that \\~30% of the sample show evidence for young stars, which is similar to the results obtained for higher luminosity samples. We compare our results with far-infrared measurements in order to investigate the far-infrared-starburst link. The nature of the optical-radio correlations is investigated in light of this new available data and, in contrast to previous studies, we find that the FRI sources follow the correlations with a similar slope to that found for the FRIIs. Finally, we compare the luminosity of the emission lines in the FRI and BL Lac sources and find a significant difference in the [OIII] line luminosities of the two groups. Our results are discussed in the context of the unified schemes.

  15. The Spectral Index Distribution of EGRET Blazars: Prospects for GLAST

    SciTech Connect (OSTI)

    Venters, Tonia M.; Pavlidou, Vasiliki; /SLAC

    2011-11-29T23:59:59.000Z

    The intrinsic distribution of spectral indices in GeV energies of gamma-ray-loud blazars is a critical input in determining the spectral shape of the unresolved blazar contribution to the diffuse extragalactic gamma-ray background, as well as an important test of blazar emission theories. We present a maximum-likelihood method of determining the intrinsic spectral index distribution (ISID) of a population of {gamma}-ray emitters which accounts for error in measurement of individual spectral indices, and we apply it to EGRET blazars. We find that the most likely Gaussian ISID for EGRET blazars has a mean of 2.27 and a standard deviation of 0.20. We additionally find some indication that FSRQs and BL Lacs may have different ISIDs (with BL Lacs being harder). We also test for spectral index hardening associated with blazar variability for which we find no evidence. Finally, we produce simulated GLAST spectral index datasets and perform the same analyses. With improved statistics due to the much larger number of resolvable blazars, GLAST data will help us determine the ISIDs with much improved accuracy. Should any difference exist between the ISIDs of BL Lacs and FSRQs or between the ISIDs of blazars in the quiescent and flaring states, GLAST data will be adequate to separate these ISIDs at a significance better than 3{sigma}.

  16. Probing the Flare Atmospheres of M dwarfs Using Infrared Emission Lines

    E-Print Network [OSTI]

    Schmidt, Sarah J; Hawley, Suzanne L; Hilton, Eric J; Wisniewski, John P; Tofflemire, Benjamin M

    2011-01-01T23:59:59.000Z

    We present the results of a campaign to monitor active M dwarfs using infrared spectroscopy, supplemented with optical photometry and spectroscopy. We detected 16 flares during nearly 50 hours of observations on EV Lac, AD Leo, YZ CMi, and VB8. The three most energetic flares also showed infrared emission, including the first reported detections of P\\beta, P\\gamma, He I 10830\\AA and Br\\gamma during an M dwarf flare. The strongest flare (\\Delta u = 4.02 on EV Lac) showed emission from H\\gamma, H\\delta, He I 4471\\AA, and Ca II K in the UV/blue and P\\beta, P\\gamma, P\\delta, Br\\gamma, and He I 10830\\AA in the infrared. The weaker flares (\\Delta u = 1.68 on EV Lac and \\Delta U = 1.38 on YZ CMi) were only observed with photometry and infrared spectroscopy; both showed emission from P\\beta, P\\gamma, and He I 10830\\AA. The strongest infrared emission line, P\\beta, occurred in the active mid-M dwarfs with a duty cycle of ~3-4%. To examine the most energetic flare, we used the static NLTE radiative transfer code RH to ...

  17. The Evolution of Swift/BAT blazars and the origin of the MeV background

    SciTech Connect (OSTI)

    Ajello, M.; /SLAC /KIPAC, Menlo Park; Costamante, L.; /Stanford U., HEPL /KIPAC, Menlo Park; Sambruna, R.M.; Gehrels, N.; /NASA, Goddard; Chiang, J.; /SLAC /KIPAC, Menlo Park; Rau, A.; /Caltech; Escala, A.; /SLAC /KIPAC, Menlo Park /Cerro Calan Observ.; Greiner, J.; /Garching, Max Planck Inst., MPE; Tueller, J.; /NASA, Goddard; Wall, J.V.; /British Columbia U.; Mushotzky, R.F.; /NASA, Goddard

    2009-10-17T23:59:59.000Z

    We use 3 years of data from the Swift/BAT survey to select a complete sample of X-ray blazars above 15 keV. This sample comprises 26 Flat-Spectrum Radio Quasars (FSRQs) and 12 BL Lac objects detected over a redshift range of 0.03 < z < 4.0. We use this sample to determine, for the first time in the 15-55 keV band, the evolution of blazars. We find that, contrary to the Seyfert-like AGNs detected by BAT, the population of blazars shows strong positive evolution. This evolution is comparable to the evolution of luminous optical QSOs and luminous X-ray selected AGNs. We also find evidence for an epoch-dependence of the evolution as determined previously for radio-quiet AGNs. We interpret both these findings as a strong link between accretion and jet activity. In our sample, the FSRQs evolve strongly, while our best-fit shows that BL Lacs might not evolve at all. The blazar population accounts for 10-20% (depending on the evolution of the BL Lacs) of the Cosmic X-ray background (CXB) in the 15-55 keV band. We find that FSRQs can explain the entire CXB emission for energies above 500 keV solving the mystery of the generation of the MeV background. The evolution of luminous FSRQs shows a peak in redshift (z{sub c} = 4.3 {+-} 0.5) which is larger than the one observed in QSOs and X-ray selected AGNs. We argue that FSRQs can be used as tracers of massive elliptical galaxies in the early Universe.

  18. Genetic Regulation of Intrinsic Endurance Exercise Capacity in Mice

    E-Print Network [OSTI]

    Courtney, Sean M.

    2013-07-26T23:59:59.000Z

    /J, C58/J, CAST/EiJ, CBA/J, CE/J, DBA/2J, FVB/NJ, KK/HlJ, I/LnJ, LP/J, MA/MyJ, MRL/MpJ, NOD/ShiLtJ, NON/ShiLtJ, NZB/BINJ, NZO/HlLtJ, NZW/LacJ, PL/J, PWD/PhJ, PWK/PhJ, RIIIS/J, SJL/J, SM/J, SWR/J and WSB/EiJ) (n = 6 per strain) were purchased from...

  19. Voids as Alternatives to Dark Energy and the Propagation of Gamma Rays through the Universe

    E-Print Network [OSTI]

    De Lavallaz, Arnaud

    2011-01-01T23:59:59.000Z

    We test the opacity of a void Universe to TeV energy gamma rays having obtained the extra-galactic background light in that Universe using a simple model and the observed constraints on the star formation rate history. We find that the void Universe has significantly more opacity than a Lambda-CDM Universe, putting it at odds with observations of BL-Lac objects. We argue that while this method of distinguishing between the two cosmologies contains uncertainties, it circumvents any debates over fine-tuning.

  20. In vivo evidence of alternative loop geometries in DNA-protein complexes

    E-Print Network [OSTI]

    Leonor Saiz; Jose M. G. Vilar

    2006-02-10T23:59:59.000Z

    The in vivo free energy of looping double-stranded DNA by the lac repressor has a remarkable behavior whose origins are not fully understood. In addition to the intrinsic periodicity of the DNA double helix, the in vivo free energy has an oscillatory component of about half the helical period and oscillates asymmetrically with an amplitude significantly smaller than predicted by current theories. Here, we show that the in vivo behavior is accurately accounted for by the simultaneous presence of two distinct conformations of looped DNA. Our analysis reveals that these two conformations have different optimal free energies and phases and that they behave distinctly in the presence of key architectural proteins.

  1. Seven-Year Multi-Color Optical Monitoring of BL Lacertae Object S5 0716+714

    E-Print Network [OSTI]

    Dai, Yan; Zhu, Zong-Hong; Zhou, Xu; Ma, Jun; Yuan, Qirong; Wang, Lingzhi

    2012-01-01T23:59:59.000Z

    We have monitored the BL Lac object S5 0716+714 in five intermediate optical wavebands from 2004 September to 2011 April. Here we present the data that include 8661 measurements which represents one of the largest databases obtained for an object at optical domain. A simple analysis of the data indicates that the object was active in most time, and intraday variability was frequently observed. In total, the object varied by 2.614 magnitudes in the $i$ band. Strong bluer-when-brighter chromatism was observed on long, intermediate, and short timescales.

  2. X-ray Emission of Low-Energy-Peaked BL Lacertae Objects

    SciTech Connect (OSTI)

    Randall, Jill M.; Perlman, Eric S. [Florida Institute of Technology, Department of Physics and Space Sciences, 150 W. University Blvd., Melbourne, FL 32901 (United States)

    2009-12-18T23:59:59.000Z

    Presented here is an analysis of X-ray observations of the following seven low-energy-peaked BL Lacertae objects: BL Lacertae, S5 0716+71, W Comae, 3C 66A, S4 0954+65, OJ 287, and AO 0235+16. The spectral data for these objects were taken from observations by the XMM-Newton and/or Chandra X-ray observatories. These objects are being analyzed in an effort to reanalyze all XMM-Newton and Chandra data of low-energy BL Lacs, similar to the efforts of Perlman et al.[4] for high energy BL Lacs. The objects were studied in an effort to understand the nature of the X-ray and multi-waveband emissions in these objects, study the shape of the spectra, and compare the observations of low-energy-peaked BL Lacs to previous observations of these objects and also to observations of high-energy-peaked BL Lacs. Light curves and spectra were analyzed to look for evidence of spectral variability in the objects and as a comparison to previous research on these objects. Most data shows both synchrotron and Inverse-Compton emission, though only little correlation was seen between the emission strength and the spectral slope. Our data is generally well-fitted to a broken power law model with distinct bimodality seen in the first spectral index (six observations with {Gamma}{sub 1{approx}}0.4 and four observations with {Gamma}{sub 1{approx}}3.0), a break in energy between 0.6 and 1.4 keV, and a second spectral index {Gamma}{sub 2{approx}}2.0. None of the observations showed spectral lines, which is consistent with past results. For S5 0716+71 the XMM-Newton X-ray and optical data, along with radio data obtained from the University of Michigan Radio Astronomy Observatory (UMRAO), a spectral energy distribution was created and peak frequencies were estimated.

  3. Characterization of protein binding to the psbAII promoter region in Synechococcus sp. strain PCC 7942 and its role in light regulated gene expression

    E-Print Network [OSTI]

    Dickerson, Naoma Suzanne

    1994-01-01T23:59:59.000Z

    intensity. Translational gene fusions between each of the psbA genes and a truncated Escherichia coli lacZ gene were prepared as reporters for psbA gene activity (35). P-galactosidase assays of strains carrying these fusions show that as light intensity... decreases from 600 ttE m 2 s-I to 2 ttE m 2 s I, expression of the psbAI gene fusion increases 800%, whereas expression of the psbAII and psbAIII gene fusions decreases 90% (35). To determine if light availability affects the ratio of the two forms...

  4. DIRECT INTERACTION OF ROTAVIRUS NON STRUCTURAL PROTEIN 4 WITH HEAT SHOCK PROTEIN 56 PROTEIN

    E-Print Network [OSTI]

    Moon, Soon Young

    2012-05-04T23:59:59.000Z

    growth on a plate. Also when URA3 is activated, yeast convert 5FOA (5 fluorooratic acid) to 5 fluorouracil, which is toxic. Thus stronger the interaction of two proteins, less growth is observed in 5FOA plate. When lacZ is activated, yeast will express...: SC that lacks leu, trp, and histamine (his) but contains 3AT (We tested three concentrations, 12.5mM, 50mM and 100 mM), SC that lacks leu, trp, and uracil (ura), SC that lacks leu, trp, but contains 0.2% 5 fluoroorotic acid (5FOA), and Yeast...

  5. Investigation of cracking and leaking of nuclear reactor pools

    E-Print Network [OSTI]

    Cooper, William Bernard

    1965-01-01T23:59:59.000Z

    *ion of the pool was lined with a 0. 2y in, aluminum I'xxer which hss since corroded. snd. pitted. allowing the dent nex slimed watel' used xxx the pool to come into dix'ec't contact with the concx etc pool wall. Pigure Hc, LacBtx one oi l&BkBg?e A mare detai3... good, Job i'or several years without, renovation, [0] This type of reactor has, however, developed. some maJor problems that have?or will, require r'enovation ~ Figure l. Nuclear Science Center Reactor Facie. ity at, Texas A& University...

  6. Suppression and enhancement of transcriptional noise by DNA looping

    E-Print Network [OSTI]

    Jose M. G. Vilar; Leonor Saiz

    2014-06-11T23:59:59.000Z

    DNA looping has been observed to enhance and suppress transcriptional noise but it is uncertain which of these two opposite effects is to be expected for given conditions. Here, we derive analytical expressions for the main quantifiers of transcriptional noise in terms of the molecular parameters and elucidate the role of DNA looping. Our results rationalize paradoxical experimental observations and provide the first quantitative explanation of landmark individual-cell measurements at the single molecule level on the classical lac operon genetic system [Choi et al., Science 322, 442-446 (2008)].

  7. Ukraine's Military Role in the Black Sea Region

    E-Print Network [OSTI]

    Coffman, Amy Beth; Crump, James Andrew; Dickson, Robbi K.; Mueller, Meaghan; Pulis, Sarah L.

    2010-01-01T23:59:59.000Z

    UK T RAIN HE B ES LAC MILI K S TARY EA R RO EGI LE IN ON Ukraines Military Role in the Black Sea Region TheBushSchoolofGovernmentandPublicServiceatTexasA&MUniversity 2 Authors Amy Beth...America,WashingtonDC.Itwasauthoredbymembersof theBushSchoolofGovernmentandPublicService. TheauthorswouldliketothanktheUkrainianCongressCommitteeof America,theGeorgeBushSchoolofGovernmentandPublicServiceat TexasA&MUniversity...

  8. Mining the Blazar Sky

    E-Print Network [OSTI]

    Paolo Padovani; Paolo Giommi

    2000-12-15T23:59:59.000Z

    We present the results of our methods to "mine" the blazar sky, i.e., select blazar candidates with very high efficiency. These are based on the cross-correlation between public radio and X-ray catalogs and have resulted in two surveys, the Deep X-ray Radio Blazar Survey (DXRBS) and the "Sedentary" BL Lac survey. We show that data mining is vital to select sizeable, deep samples of these rare active galactic nuclei and we touch upon the identification problems which deeper surveys will face.

  9. Slaughter and carcass characteristics of finewool vs crossbred lambs

    E-Print Network [OSTI]

    Bland, Bobby J

    1960-01-01T23:59:59.000Z

    OL Nod 2 lou. ar e h &'a Wf a XS 8431 fo ~ P+ ko ~ 8 0 o 7 of aN boos fo lac r ~ of leg fo oh b . 49 ~ of La& ( l~zz r 9 B~gh ok ~ /th ~ RS - ' ? tm WMt8x shou u& 6 ruffle af 'S XafL~. Pi b @erg mart ee Cmi' l. '. f a ause 'f0 Rl... w Since very 1. ittle carcass worh has been reported on sheep, this study was initiated to give s basis and direction for further worh in this area. Specifically there were three avagor points for which answers were desired. These ware...

  10. FYI: January 6, 1994 - June 30, 1994

    E-Print Network [OSTI]

    1994-01-01T23:59:59.000Z

    of the MARC fonnats projects Item #5 was retained, but moved farther down on the list LAC, December 7, 1993, page 2 Item #6 had previously been moved below items 7 and 9 Item #8 was retained, but with the added possibilities of either a case... catalog, at 2 weeks #8, concerning alphanumeric searches, at I week #13, the "Science" problem, at 3 weeks #21, a map or locator feature, at 2 weeks #20, patron-initiated display of items checked out, at 4 weeks #23, the problem of initial...

  11. LAUSDEO Incorporated | 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 YouKizildere I Geothermal Pwer Plant Jump to: navigation, search GEOTHERMALTexas:Kuju KankoAnnouncement AgendaLAC

  12. LBNL Renewable Energy Market and Policy Analysis | 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 YouKizildere I Geothermal Pwer Plant Jump to: navigation, search GEOTHERMALTexas:Kuju KankoAnnouncement AgendaLAC

  13. Laddonia, Missouri: Energy Resources | 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 Kilauea Volcano, Hawaii9969995°,ILEDSGP/join <Lac qui Parle

  14. Lafayette County, Mississippi: Energy Resources | 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 Kilauea Volcano, Hawaii9969995°,ILEDSGP/join <Lac qui

  15. Lafayette, Louisiana: Energy Resources | 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 Kilauea Volcano, Hawaii9969995°,ILEDSGP/join <Lac qui0897°,

  16. Lahaina-Kaanapali Geothermal Area | 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 Kilauea Volcano, Hawaii9969995°,ILEDSGP/join <Lac

  17. Lake Arrowhead, California: Energy Resources | 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 Kilauea Volcano, Hawaii9969995°,ILEDSGP/join <LacArrowhead,

  18. Lake Benton I Wind Farm | 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 Kilauea Volcano, Hawaii9969995°,ILEDSGP/join <LacArrowhead,I Wind

  19. Lake Benton II Wind Farm | 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 Kilauea Volcano, Hawaii9969995°,ILEDSGP/join <LacArrowhead,I WindII

  20. Lake County, Ohio: Energy Resources | 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 Kilauea Volcano, Hawaii9969995°,ILEDSGP/join <LacArrowhead,I

  1. Lake Dallas, Texas: Energy Resources | 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 Kilauea Volcano, Hawaii9969995°,ILEDSGP/join <LacArrowhead,IDallas,

  2. Millenial Net 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 YouKizildere I Geothermal Pwer Plant JumpMarysville, Ohio:Menomonee|Mililani Town, Hawaii:Mille Lacs County,Millenial Net

  3. Millenium Synergy Pvt Ltd | 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 YouKizildere I Geothermal Pwer Plant JumpMarysville, Ohio:Menomonee|Mililani Town, Hawaii:Mille Lacs County,Millenial

  4. Millennium Communication Co Ltd | 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 YouKizildere I Geothermal Pwer Plant JumpMarysville, Ohio:Menomonee|Mililani Town, Hawaii:Mille Lacs

  5. Millennium Electric TOU Ltd aka Millennium Solar EIG Solar | 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 JumpMarysville, Ohio:Menomonee|Mililani Town, Hawaii:Mille LacsInformation TOU Ltd

  6. Millennium Energy Industries | 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 YouKizildere I Geothermal Pwer Plant JumpMarysville, Ohio:Menomonee|Mililani Town, Hawaii:Mille LacsInformation TOU

  7. Millennium Ethanol LLC | 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 YouKizildere I Geothermal Pwer Plant JumpMarysville, Ohio:Menomonee|Mililani Town, Hawaii:Mille LacsInformation

  8. DETERMINATION OF THE POINT-SPREAD FUNCTION FOR THE FERMI LARGE AREA TELESCOPE FROM ON-ORBIT DATA AND LIMITS ON PAIR HALOS OF ACTIVE GALACTIC NUCLEI

    SciTech Connect (OSTI)

    Ackermann, M. [Deutsches Elektronen Synchrotron DESY, D-15738 Zeuthen (Germany)] [Deutsches Elektronen Synchrotron DESY, D-15738 Zeuthen (Germany); Ajello, M.; Allafort, A.; Bechtol, K.; Bloom, E. D.; Borgland, A. W.; Bottacini, E.; Buehler, R. [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)] [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); Asano, K. [Interactive Research Center of Science, Tokyo Institute of Technology, Meguro City, Tokyo 152-8551 (Japan)] [Interactive Research Center of Science, Tokyo Institute of Technology, Meguro City, Tokyo 152-8551 (Japan); Atwood, W. B. [Santa Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064 (United States)] [Santa Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064 (United States); Baldini, L.; Bellazzini, R.; Bregeon, J. [Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa (Italy)] [Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa (Italy); Ballet, J. [Laboratoire AIM, CEA-IRFU/CNRS/Universite Paris Diderot, Service d'Astrophysique, CEA Saclay, F-91191 Gif sur Yvette (France)] [Laboratoire AIM, CEA-IRFU/CNRS/Universite Paris Diderot, Service d'Astrophysique, CEA Saclay, F-91191 Gif sur Yvette (France); Barbiellini, G. [Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34127 Trieste (Italy)] [Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34127 Trieste (Italy); Bastieri, D. [Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova (Italy)] [Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova (Italy); Bonamente, E. [Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia (Italy)] [Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia (Italy); Brandt, T. J. [CNRS, IRAP, F-31028 Toulouse cedex 4 (France)] [CNRS, IRAP, F-31028 Toulouse cedex 4 (France); Brigida, M. [Dipartimento di Fisica 'M. Merlin' dell'Universita e del Politecnico di Bari, I-70126 Bari (Italy)] [Dipartimento di Fisica 'M. Merlin' dell'Universita e del Politecnico di Bari, I-70126 Bari (Italy); Bruel, P., E-mail: mdwood@slac.stanford.edu, E-mail: mar0@uw.edu [Laboratoire Leprince-Ringuet, Ecole polytechnique, CNRS/IN2P3, F-91128 Palaiseau (France); and others

    2013-03-01T23:59:59.000Z

    The Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope is a pair-conversion telescope designed to detect photons with energies from Almost-Equal-To 20 MeV to >300 GeV. The pre-launch response functions of the LAT were determined through extensive Monte Carlo simulations and beam tests. The point-spread function (PSF) characterizing the angular distribution of reconstructed photons as a function of energy and geometry in the detector is determined here from two years of on-orbit data by examining the distributions of {gamma} rays from pulsars and active galactic nuclei (AGNs). Above 3 GeV, the PSF is found to be broader than the pre-launch PSF. We checked for dependence of the PSF on the class of {gamma}-ray source and observation epoch and found none. We also investigated several possible spatial models for pair-halo emission around BL Lac AGNs. We found no evidence for a component with spatial extension larger than the PSF and set upper limits on the amplitude of halo emission in stacked images of low- and high-redshift BL Lac AGNs and the TeV blazars 1ES0229+200 and 1ES0347-121.

  9. Heart valve cardiomyocytes of mouse embryos express the serotonin transporter SERT

    SciTech Connect (OSTI)

    Pavone, Luigi Michele [Department of Biological Structures, Functions and Technologies, University of Naples Federico II, Via F. Delpino 1, 80137 Naples (Italy); Department of Biochemistry and Medical Biotechnologies, University of Naples Federico II, Naples (Italy)], E-mail: pavone@dbbm.unina.it; Spina, Anna; Lo Muto, Roberta; Santoro, Dionea [Department of Biological Structures, Functions and Technologies, University of Naples Federico II, Via F. Delpino 1, 80137 Naples (Italy); Department of Biochemistry and Medical Biotechnologies, University of Naples Federico II, Naples (Italy); Mastellone, Vincenzo [Department of Experimental Medicine 'G. Salvatore', University of Magna Graecia, Catanzaro (Italy); Avallone, Luigi [Department of Biological Structures, Functions and Technologies, University of Naples Federico II, Via F. Delpino 1, 80137 Naples (Italy)

    2008-12-12T23:59:59.000Z

    Multiple evidence demonstrate a role for serotonin and its transporter SERT in heart valve development and disease. By utilizing a Cre/loxP system driven by SERT gene expression, we recently demonstrated a regionally restricted distribution of SERT-expressing cells in developing mouse heart. In order to characterize the cell types exhibiting SERT expression within the mouse heart valves at early developmental stages, in this study we performed immunohistochemistry for Islet1 (Isl1) and connexin-43 (Cx-43) on heart sections from SERT{sup Cre/+};ROSA26R embryos previously stained with X-gal. We observed the co-localization of LacZ staining with Isl1 labelling in the outflow tract, the right ventricle and the conal region of E11.5 mouse heart. Cx-43 labelled cells co-localized with LacZ stained cells in the forming atrioventricular valves. These results demonstrate the cardiomyocyte phenotype of SERT-expressing cells in heart valves of the developing mouse heart, thus suggesting an active role of SERT in early heart valve development.

  10. The Optical Polarization Properties of X-ray Selected BL Lacertae Objects

    E-Print Network [OSTI]

    B. T. Jannuzi; P. S. Smith; R. Elston

    1993-08-16T23:59:59.000Z

    We discuss the optical polarization properties of X-ray selected BL Lacertae objects (XSBLs) as determined from three years of monitoring 37 BL Lac objects and candidates. The observed objects include a complete X-ray flux limited sample drawn from the EMS Survey. The majority of the XSBLs classi- fied solely on the appearance of their spectra are members of the class of BL~Lacs since they possess intrinsically polarized and variable continua. The duty cycle of polarized emission from XSBLs is 40\\%. The majority of XSBLs ($\\approx 85$\\%) have preferred polarization position angles on time scales as long as three years. This reflects stability in the geometry of the region emitting the polarized optical emission. We discuss the observed spectral dependence of the degree of polarization and some of the possible mechanisms for producing the observed characteristics. While dilution of the polarized emission by the host galaxy starlight is present in some objects, we demon- strate that the average polarization properties derived from our observations are not drastically affected by this effect. The objects in our monitored sample did not display the larger than one magnitude variations generally used to characterize the optical variability of blazars in general.

  11. Synchrotron and Inverse Compton Variability in the BL Lacertae object S5 0716+714

    E-Print Network [OSTI]

    P. Giommi; E. Massaro; L. Chiappetti; E. C. Ferrara; G. Ghisellini; Minhwan Jang; M. Maesano; H. R. Miller; F. Montagni; R. Nesci; P. Padovani; E. Perlman; C. M. Raiteri; S. Sclavi; G. Tagliaferri; G. Tosti; M. Villata

    1999-09-14T23:59:59.000Z

    We report intensity variations of different spectral components in the BL Lac object S5 0716+714 detected during coordinated BeppoSAX and optical observations in 1996 and 1998. The transition between synchrotron and inverse Compton emission has been clearly detected as sharp X-ray spectral breaks at around 2-3 keV on both occasions. Correlated optical and soft X-ray variability was found during the second BeppoSAX pointing when intensive optical monitoring could be arranged. The hard (Compton) component changed by a factor of 2 between the two observations, but remained stable within each exposure. During events of rapid variability S5 0716+714 showed spectral steepening with intensity, a behaviour rarely observed in BL Lacs. We interpret these findings as the probable consequence of a shift of the synchrotron peak emission from the IR/optical band to higher energies, causing the synchrotron tail to push into the soft X-ray band more and more as the source brightens.

  12. Kinematic Study of the Blazar S5 0716+714

    E-Print Network [OSTI]

    U. Bach; T. P. Krichbaum; E. Ros; S. Britzen; W. W. Tian; A. Kraus; A. Witzel; J. A. Zensus

    2005-01-11T23:59:59.000Z

    We present the results of a multi-frequency study of the structural evolution of the VLBI jet in the BL Lac object 0716+714 over the last 10 years. We show VLBI images obtained at 5 GHz, 8.4 GHz, 15 GHz and 22 GHz. The milliarcsecond source structure is best described by a one-sided core-dominated jet of ~10 mas length. Embedded jet components move superluminally with speeds ranging from 5 c to 16 c (assuming z=0.3). Such fast superluminal motion is not typical for BL Lac objects, however it is still in the range of jet speeds typically observed in quasars (10 c to 20 c). In 0716+714, younger components, that were ejected more recently, seem to move systematically slower than the older components. This and a systematic position angle variation of the inner (1 mas) portion of the VLBI jet, suggests an at least partly geometric origin of the observed velocity variations. The observed rapid motion and the derived Lorentz factors are discussed with regard to the rapid Intra-Day Variability (IDV) and the gamma-ray observations, from which very high Doppler factors are inferred.

  13. Isolation and characterization of a highly repeated satellite DNA sequence from the cyprinid fish Notropis lutrensis

    E-Print Network [OSTI]

    Moyer, Susan Pavlosky

    1986-01-01T23:59:59.000Z

    endonuclease digests of pSMI thru pSM4 35 Agarose gel containing restriction endonuclease digests of pSM 5 thru pSMB 36 10. Multiple cloning site (MCS) located in the lac z' gene of pUCB 37 New site produced upon ligation of Mbol and BamHI overlapping ends... pSM 5, contained an insert in the 205 to 225 base pair size range. The inserts in pSMI-pSM3 ranged in size from 205 to 215 base pairs; whereas the inserts in pSM4 and pSMS thru pSMB ranged fn size from 220-225 base pairs. The pSM2 isolate...

  14. Needs assessment for fire department services and resources for the Los Alamos National Laboratory, Los Alamos, New Mexico. Final report

    SciTech Connect (OSTI)

    NONE

    1995-11-15T23:59:59.000Z

    This report has been developed in response to a request from the Los Alamos National Laboratory (LANL) to evaluate the need for fire department services so as to enable the Laboratory to plan effective fire protection and thereby: meet LANL`s regulatory and contractual obligations; interface with the Department of Energy (DOE) and other agencies on matters relating to fire and emergency services; and ensure appropriate protection of the community and environment. This study is an outgrowth of the 1993 Fire Department Needs Assessment (prepared for DOE) but is developed from the LANL perspective. Input has been received from cognizant and responsible representatives at LANL, DOE, Los Alamos County (LAC) and the Los Alamos Fire Department (LAFD).

  15. The jet of Markarian 501 from the sub-parsec to the kpc scale

    E-Print Network [OSTI]

    G. Giovannini; M. Giroletti; G. B. Taylor

    2007-08-29T23:59:59.000Z

    We have observed the BL Lac object Markarian 501 at 1.4 GHz with the High Sensitivity Array and at 86 GHz with the global VLBI mm array. Thanks to the great resolution and sensitivity provided by these instruments, we probe regions of the radio jets never accessed before. The new data at 1.4 GHz allow us to map the one-sided jet at large distances from the core, and to constrain jet properties thanks to the high jet to counter-jet brightness ratio. The 86 GHz data give us a high resolution image of the nuclear region. Putting together these new results and available published data we discuss the properties of this source from sub-parsec to kiloparsec scales.

  16. A comparative salary study of professional engineers employed by Texas State and municipal governments and private industry

    E-Print Network [OSTI]

    Mauer, William A

    1957-01-01T23:59:59.000Z

    rash% in the Lower 4?oil? earn?4 N~F%~ whil? thea? r?ak?C in the lower qn?rtilo earn?4 $$, 984 Of the oi, vil ?ngin?o& yablie+?apl?~, thee? aek?d in the lower 4?oil??arn?4 $&, 640 whil? theo? r?nk?4 in tho lower quartile e?ra?4 Sgs~~ Xt weQ4?e?n Ad... Cees6ttee& y e sio i n lac Gal Su e 1 Qnl 0 yy+ ~ oonl4 be ?soared? A Qnoationnairo was oonposod) llsiJIg porta of 'ths one at@, 5. sed in the muley the National gooier of Professional Engineers? oonsisting bf Qlxootioaa pertain 1ng to eapl...

  17. Diameters of delta Cephei and eta Aquilae Measured with the Navy Prototype Optical Interferometer

    E-Print Network [OSTI]

    J. T. Armstrong; Tyler E. Nordgren; M. E. Germain; Arsen R. Hajian; R. B. Hindsley; C. A. Hummel; D. Mozurkewich; R. N. Thessin

    2000-09-25T23:59:59.000Z

    We have measured the diameters of the Cepheid variables delta Cephei (18 nights) and eta Aquilae (11 nights) with the Navy Prototype Optical Interferometer. The primary results of these observations are the mean angular diameters of these Cepheids: 1.520 +/- 0.014 milliseconds of arc (mas) for delta Cep and 1.69 +/- 0.04 mas for eta Aql. We also report limb-darkened diameters for the check stars in this program: for beta Lac, theta(LD) = 1.909 +/- 0.011 mas, and for 12 Aql, theta(LD) = 2.418 +/- 0.010 mas. When combined with radius estimates from period-radius relations in the literature, the Cepheid angular diameters suggest distances slightly smaller than, but still consistent with, the Hipparcos distances. Pulsations are weakly detected at a level of about 1.5 sigma to 2 sigma for both Cepheids.

  18. OPTICAL SPECTRA OF CANDIDATE SOUTHERN HEMISPHERE INTERNATIONAL CELESTIAL REFERENCE FRAME (ICRF) RADIO SOURCES

    SciTech Connect (OSTI)

    Titov, O. [Geoscience Australia, P.O. Box 378, Canberra, ACT 2601 (Australia); Jauncey, D. L. [CSIRO Astronomy and Space Science, ATNF and Mount Stromlo Observatory, Cotter Road, Weston, ACT 2611 (Australia); Johnston, H. M.; Hunstead, R. W. [Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006 (Australia); Christensen, L., E-mail: oleg.titov@ga.gov.au [Technische Universitaet Munich, Excellence Cluster Universe, Boltzmannstr. 2, D-85748 Garching (Germany)

    2011-11-15T23:59:59.000Z

    We present the results of spectroscopic observations of the optical counterparts of 47 southern radio sources from the candidate International Celestial Reference Catalogue as part of a very long baseline interferometry (VLBI) program to strengthen the celestial reference frame, especially in the south. We made the observations with the 3.58 m European Southern Observatory New Technology Telescope. We obtained redshifts for 30 quasars and one radio galaxy, with a further seven objects being probable BL Lac objects with featureless spectra. Of the remainder, four were clear misidentifications with Galactic stars and five had low signal-to-noise spectra and could not be classified. These results, in combination with new VLBI data of the radio sources with redshifts more than 2, add significantly to the existing data needed to refine the distribution of source proper motions over the celestial sphere.

  19. Observation of Strong Variability in the X-Ray Emission from Markarian 421 Correlated with the May 1996 TeV Flare

    E-Print Network [OSTI]

    Michael Schubnell

    1997-07-11T23:59:59.000Z

    We observed the BL Lac object Markarian 421 with the X-ray satellite RXTE and the Whipple Air Cerenkov Telescope during a two week correlated X-ray/gamma-ray campaign in May 1996. Two dramatic outbursts with extremely rapid and strong flux variations were observed at TeV energies during this period. The X-ray emission in the 2-10 keV band was highly variable and reached a peak flux of $5.6\\times10^{-10}$ erg cm$^{-2}$ s$^{-1}$, a historic high. Similar behavior was observed for the TeV emission. In contrast to earlier near-simultaneous X-ray/gamma-ray observations of Mrk 421, the variability amplitude is much larger at TeV than at X-ray energies. This behavior is expected in Synchrotron Self-Compton models.

  20. The synchrotron peak shift during high-energy flares of blazars

    E-Print Network [OSTI]

    M. Boettcher

    1999-02-10T23:59:59.000Z

    A prediction for the energy shift of the synchrotron spectrum of flat-spectrum radio quasars (FSRQs) during high-energy flares is presented. If the $\\gamma$-ray emission of FSRQs is produced by Comptonization of external radiation, then the peak of the synchrotron spectrum is predicted to move to lower energies in the flare state. This is opposite to the well-known broadband spectral behavior of high-frequency peaked BL-Lac objects where the external radiation field is believed to be weak and synchrotron-self Compton scattering might be the dominant $\\gamma$-ray radiation mechanism. The synchrotron peak shift, if observed in FSRQs, can thus be used as a diagnostic to determine the dominant radiation mechanism in these objects. I suggest a few FSRQs as promising candidates to test the prediction of the external-Comptonization model.

  1. Are BL Lacertae Objects Beamed QSO Remnants?

    E-Print Network [OSTI]

    E. F. Borra

    1994-08-05T23:59:59.000Z

    This paper considers the hypothesis that BL Lacertae objects (BLLs) are the beamed remnants of Quasi Stellar Objects. The hypothesis explains why BLLs do not undergo the strong evolution seen in other active galactic nuclei since it naturally predicts that the space density of BLLs should increase with cosmic time, as shown by recent observations. Numerical models reproduce, with reasonable parameters, the known redshift and magnitude counts of BL Lac objects. It is assumed that radio-quiet as well as radio-loud quasars are capable of generating jets but that jets are snuffed in young radio-quiet objects and only emerge in aged ones. I argue that the observations allow this assumption.

  2. The Blazar Sequence: Validity and Predictions

    E-Print Network [OSTI]

    P. Padovani

    2006-10-18T23:59:59.000Z

    The "blazar sequence" posits that the most powerful BL Lacertae objects and flat-spectrum radio quasars should have relatively small synchrotron peak frequencies, nu_peak, and that the least powerful such objects should have the highest nu_peak values. This would have strong implications for our understanding of jet formation and physics and the possible detection of powerful, moderately high-redshift TeV blazars. I review the validity of the blazar sequence by using the results of very recent surveys and compare its detailed predictions against observational data. I find that the blazar sequence in its simplest form is ruled out. However, powerful flat-spectrum radio quasars appear not to reach the nu_peak typical of BL Lacs. This could indeed be related to some sort of sequence, although it cannot be excluded that it is instead due to a selection effect.

  3. Magnetic Fields in Blazar Pc-scale Jets - Possible connection to Spin Rates of Black holes ?

    E-Print Network [OSTI]

    P. Kharb; M. L. Lister; P. Shastri

    2008-03-06T23:59:59.000Z

    We re-examine the differences observed in the pc-scale magnetic field geometry of high and low optical polarization Quasars (HPQs, LPRQs) using the MOJAVE sample. We find that, as previously reported, HPQ jets exhibit predominantly transverse B fields while LPRQ jets tend to display longitudinal B fields. We attempt to understand these results along with the different B field geometry observed in the low and high energy peaked BL Lacs (LBLs, HBLs) using a simple picture wherein the spinning central black holes in these AGNs influence the speed and strength of the jet components (spine, sheath). Higher spin rates in HPQs compared to LPRQs and LBLs compared to HBLs could explain the different total radio powers, VLBI jet speeds, and the observed B field geometry in these AGN classes.

  4. When less is more: Are radio galaxies below the Fanaroff-Riley break more polarized on parsec scales ?

    E-Print Network [OSTI]

    P. Kharb; P. Shastri; D. C. Gabuzda

    2005-09-19T23:59:59.000Z

    We present images showing the first detections of polarization on parsec scales in the nuclei of four Fanaroff-Riley type I (low-luminosity) radio galaxies. Observations with Very Long Baseline Interferometry at \\lambda 3.6cm reveal the presence of ordered magnetic fields within ~1650 Schwarzchild radii of the putative central supermassive black hole. The relatively high fractional polarization in the pc-scale jets of these galaxies is consistent with the standard scheme unifying low-luminosity radio galaxies with BL Lac objects. This result also suggests that these radio galaxies lack the obscuring tori that apparently depolarize the nuclear emission in the more powerful FRII radio galaxies, and that their supermassive blackholes are poorly fed and/or inefficient radiators.

  5. Radio observations of the first three-month Fermi-AGN at 4.8 GHz

    E-Print Network [OSTI]

    Xiang Liu; Hua-Gang Song; Jun Liu; Zhen Ding; Nicola Marchili; Thomas P. Krichbaum; Lars Fuhrmann; Anton Zensus; Tao An

    2011-10-09T23:59:59.000Z

    Using the Urumqi 25m radio telescope, sources from the first three-month Fermi-LAT detected AGN catalog with declination >0 were observed in 2009 at 4.8 GHz. The radio flux density appears to correlate with the gamma-ray intensity. Intra-day variability (IDV) observations were performed in March, April and May in 2009 for selected 42 gamma-ray bright blazars, and 60% of them show evident flux variability at 4.8 GHz during the IDV observations, the IDV detection rate is higher than that in previous flat-spectrum AGN samples. The IDV appears more often in the VLBI-core dominant blazars, and the non-IDV blazars show relatively `steeper' spectral indices than the IDV blazars. Pronounced inter-month variability has been found in two BL Lac objects: J0112+2244 and J0238+1636.

  6. Supergiant radial and nonradial pulsations. Lecture 10

    SciTech Connect (OSTI)

    Cox, A.N.

    1983-03-14T23:59:59.000Z

    The stars that we consider here have luminosities above 10,000 solar luminosities and masses above 15 solar masses. We contact the 53 Per stars such as ..nu.. Ori, 10 Lac, and iota CMa at our lower luminosity limit, and at the most luminous limit, we have the famous stars eta Car, Cyg OB12, and P Cyg. Evolution tracks including a reasonable mass loss rate are given for 15, 30, 60, and 120 solar masses. It appears that our pulsators have masses less than 60 solar masses, but how do the most luminous stars observed survive mass loss. Do they have masses above 100 solar masses as indicated, or are these stars somehow superluminous due to their erratic mass loss behavior. Popper (1980) studying the masses in binary systems has never found one with a value greater than 27 solar masses.

  7. SIMULTANEOUS B'V'R' MONITORING OF BL LACERTAE OBJECT S5 0716+714 AND DETECTION OF INTER-BAND TIME DELAY

    SciTech Connect (OSTI)

    Wu Jianghua; He Xiangtao [Department of Astronomy, Beijing Normal University, Beijing 100875 (China); Boettcher, Markus [Astrophysical Institute, Department of Physics and Astronomy, Ohio University, Athens, OH 45701 (United States); Zhou Xu; Ma Jun; Jiang Zhaoji, E-mail: jhwu@bnu.edu.cn [Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012 (China)

    2012-05-15T23:59:59.000Z

    We present the results of our optical monitoring of the BL Lac object S5 0716+714 over seven nights in 2006 December. The monitoring was carried out simultaneously at three optical wavelengths with a novel photometric system. The object did not show large-amplitude internight variations during this period. Intranight variations were observed on four nights and probably on one more. Strong bluer-when-brighter chromatism was detected on both intranight and internight timescales. The intranight variation amplitude decreases in the wavelength sequence of B', R', and V'. Cross-correlation analyses revealed that the variability at the B' and V' bands leads that at the R' band by about 30 minutes on one night.

  8. Multi-color Near Infra-red Intra-day and Short Term Variability of the Blazar S5 0716+714

    E-Print Network [OSTI]

    Alok C. Gupta; Sang-Mok Cha; Sungho Lee; Ho Jin; Soojong Pak; Seoung-hyun Cho; Bongkon Moon; Youngsik Park; In-Soo Yuk; Uk-won Nam; Jaemann Kyeong

    2008-09-19T23:59:59.000Z

    In this paper, we report results of our near-infrared (NIR) photometric variability studies of the BL Lacertae object S5 0716+714. NIR photometric observations spread over 7 nights during our observing run April 2-9, 2007 at 1.8 meter telescope equipped with KASINICS (Korea Astronomy and Space Science Institute Near Infrared Camera System) and J, H, and Ks filters at Bohyunsan Optical Astronomy Observatory (BOAO), South Korea. We searched for intra-day variability, short term variability and color variability in the BL Lac object. We have not detected any genuine intra-day variability in any of J, H, and Ks passbands in our observing run. Significant short term variability ~ 32.6%, 20.5% and 18.2% have been detected in J, H, Ks passbands, respectively, and ~ 11.9% in (J-H) color.

  9. Simultaneous B'V'R' Monitoring of BL Lacertae Object S5~0716+714 and Detection of Inter-Band Time Delay

    E-Print Network [OSTI]

    Wu, Jianghua; Zhou, Xu; He, Xiangtao; Ma, Jun; Jiang, Zhaoji

    2012-01-01T23:59:59.000Z

    We present the results of our optical monitoring of the BL Lac object S5 0716+714 on seven nights in 2006 December. The monitoring was carried out simultaneously at three optical wavelengths with a novel photometric system. The object did not show large-amplitude internight variations during this period. Intranight variations were observed on four nights and probably on one more. Strong bluer-when-brighter chromatism was detected on both intranight and internight timescales. The intranight variation amplitude decreases in the wavelength sequence of B', R', and V'. Cross correlation analyses revealed that the variability at the $B'$ and $V'$ bands lead that at the $R'$ band by about 30 minutes on one night.

  10. S5 0716+714 : GeV variability study

    E-Print Network [OSTI]

    Rani, B; Lott, B; Fuhrmann, L; Zensus, J A

    2013-01-01T23:59:59.000Z

    The GeV observations by Fermi-LAT give us the opportunity to characterize the high-energy emission (100 MeV - 300 GeV) variability properties of the BL Lac object S5 0716+714. In this study, we performed flux and spectral analysis of more than 3 year long (August 2008 to April 2012) Fermi-LAT data of the source. During this period, the source exhibits two different modes of flux variability with characteristic timescales of ~75 and ~140 days, respectively. We also notice that the flux variations are characterized by a weak spectral hardening. The GeV spectrum of the source shows a clear deviation from a simple power law, and is better explained by a broken power law. Similar to other bright Fermi blazars, the break energy does not vary with the source flux during the different activity states. We discuss several possible scenarios to explain the observed spectral break.

  11. Using X-ray catalogues to find counterparts to unassociated high-energy Fermi/LAT sources

    E-Print Network [OSTI]

    Landi, R; Stephen, J B; Masetti, N; Malizia, A; Ubertini, P

    2015-01-01T23:59:59.000Z

    The first Fermi Large Area Telescope (LAT) catalogue of sources (1FHL) emitting at high energies (above 10 GeV) reports the details of 514 objects detected in the first three years of the Fermi mission. Of these, 71 were reported as unidentified in the 1FHL catalogue, although six are likely to be associated with a supernova remnant (SNR), a Pulsar Wind Nebula (PWN) or a combination of both, thereby leaving a list of 65 still unassociated objects. Herein, we report a preliminary analysis on this sample of objects concentrating on nine 1FHL sources, which were found to have a clear optical extragalactic classification. They are all blazar, eight BL Lac and one flat spectrum radio quasar, typically at redshift greater than 0.1.

  12. Identification Of Natural Dyes On Archaeological Textile Objects Using Laser Induced Fluorescent Technique

    SciTech Connect (OSTI)

    Abdel-Kareem, O. [Conservation Department, Faculty of Archaeology, Cairo University (Egypt); Eltokhy, A.; Harith, M. A. [National Institute of Laser Enhanced Science, Cairo University (Egypt)

    2011-09-22T23:59:59.000Z

    This study aims to evaluate the use of Laser Fluorescent as a non-destructive technique for identification of natural dyes on archaeological textile objects. In this study wool textile samples were dyed with 10 natural dyes such as cochineal, cutch, henna, indigo, Lac, madder, safflower, saffron, sumac and turmeric. These dyes common present on archaeological textile objects to be used as standard dyed textile samples. These selected natural dyes will be used as known references that can be used a guide to identify unknown archaeological dyes. The dyed textile samples were investigated with laser radiation in different wavelengths to detect the best wavelengths for identification each dye. This study confirms that Laser Florescent is very useful and a rapid technique can be used as a non-destructive technique for identification of natural dyes on archaeological textile objects. The results obtained with this study can be a guide for all conservators in identification of natural organic dyes on archaeological textile objects.

  13. Modulation of DNA loop lifetimes by the free energy of loop formation

    E-Print Network [OSTI]

    Chen, Yi-Ju; Mulligan, Peter; Spakowitz, Andrew J; Phillips, Rob

    2015-01-01T23:59:59.000Z

    Storage and retrieval of the genetic information in cells is a dynamic process that requires the DNA to undergo dramatic structural rearrangements. DNA looping is a prominent example of such a structural rearrangement that is essential for transcriptional regulation in both prokaryotes and eukaryotes, and the speed of such regulations affects the fitness of individuals. Here, we examine the in vitro looping dynamics of the classic Lac repressor gene-regulatory motif. We show that both loop association and loop dissociation at the DNA-repressor junctions depend on the elastic deformation of the DNA and protein, and that both looping and unlooping rates approximately scale with the looping J factor, which reflects the system's deformation free energy. We explain this observation by transition state theory and model the DNA-protein complex as an effective worm-like chain with twist. We introduce a finite protein-DNA binding interaction length, in competition with the characteristic DNA deformation length scale, ...

  14. The Highest Energy Emission Detected by EGRET from Blazars

    E-Print Network [OSTI]

    Dingus, B L; Dingus, Brenda L.; Bertsch, David L.

    2001-01-01T23:59:59.000Z

    Published EGRET spectra from blazars extend only to 10 GeV, yet EGRET has detected approximately 2000 gamma-rays above 10 GeV of which about half are at high Galactic latitude. We report a search of these high-energy gamma-rays for associations with the EGRET and TeV detected blazars. Because the point spread function of EGRET improves with energy, only ~2 gamma-rays are expected to be positionally coincident with the 80 blazars searched, yet 23 gamma-rays were observed. This collection of > 10 GeV sources should be of particular interest due to the improved sensitivity and lower energy thresholds of ground-based TeV observatories. One of the blazars, RGB0509+056, has the highest energy gamma-rays detected by EGRET from any blazar with 2 > 40 GeV, and is a BL Lac type blazar with unknown redshift.

  15. The Highest Energy Emission Detected by EGRET from Blazars

    E-Print Network [OSTI]

    Brenda L. Dingus; David L. Bertsch

    2001-07-03T23:59:59.000Z

    Published EGRET spectra from blazars extend only to 10 GeV, yet EGRET has detected approximately 2000 gamma-rays above 10 GeV of which about half are at high Galactic latitude. We report a search of these high-energy gamma-rays for associations with the EGRET and TeV detected blazars. Because the point spread function of EGRET improves with energy, only ~2 gamma-rays are expected to be positionally coincident with the 80 blazars searched, yet 23 gamma-rays were observed. This collection of > 10 GeV sources should be of particular interest due to the improved sensitivity and lower energy thresholds of ground-based TeV observatories. One of the blazars, RGB0509+056, has the highest energy gamma-rays detected by EGRET from any blazar with 2 > 40 GeV, and is a BL Lac type blazar with unknown redshift.

  16. Discovery of VHE gamma-ray emission from 1ES1218+30.4

    E-Print Network [OSTI]

    MAGIC collaboration; J. Albert; E. Aliu; H. Anderhub; P. Antoranz; A. Armada; M. Asensio; C. Baixeras; J. A. Barrio; M. Bartelt; H. Bartko; D. Bastieri; S. R. Bavikadi; W. Bednarek; K. Berger; C. Bigongiari; A. Biland; E. Bisesi; R. K. Bock; T. Bretz; I. Britvitch; M. Camara; A. Chilingarian; S. Ciprini; J. A. Coarasa; S. Commichau; J. L. Contreras; J. Cortina; V. Curtef; V. Danielyan; F. Dazzi; A. De Angelis; R. de los Reyes; B. De Lotto; E. Domingo-Santamaria; D. Dorner; M. Doro; M. Errando; M. Fagiolini; D. Ferenc; E. Fernandez; R. Firpo; J. Flix; M. V. Fonseca; L. Font; N. Galante; M. Garczarczyk; M. Gaug; M. Giller; F. Goebel; D. Hakobyan; M. Hayashida; T. Hengstebeck; D. Hoehne; J. Hose; P. Jacon; O. Kalekin; D. Kranich; A. Laille; T. Lenisa; P. Liebing; E. Lindfors

    2006-03-20T23:59:59.000Z

    The MAGIC collaboration has studied the high peaked BL-Lac object 1ES1218+30.4 at a redshift z = 0.182, using the MAGIC imaging air Cherenkov telescope located on the Canary island of La Palma. A gamma-ray signal was observed with 6.4sigma significance. The differential energy spectrum for an energy threshold of 120GeV can be fitted by a simple power law yielding F_E(E) = (8.1+-2.1)*10^-7 (E/250GeV)^(-3.0+-0.4) TeV^-1 m^-2 s^-1. During the six days of observation in January 2005 no time variability on time scales of days was found within the statistical errors. The observed integral flux above 350GeV is nearly a factor two below the the upper limit reported by the Whipple Collaboration in 2003.

  17. I. Systems available in the facility: Table no. 1: E.coli Vectors, Strains & Media

    E-Print Network [OSTI]

    Udgaonkar, Jayant B.

    MAL p5E pET31b pET300/NT- DEST BL21 RIL pET 40b(+) pET44c pET47b pET46 Ek/LIC pET301/CT- DEST BL21 RP p E. coli Strains E. coli Media pET22b pET28a pTf16 pET44a pExp1-DEST BL21 DE3 LB pET15b pQ30 Tagzyme pQE1 pET20b pExp1- GW/LacZ BL21 DE3 Star 2X YT pET20b pRSETBpG- KJE8 Tagzyme pQE2 pET44b pDEST 15 BL

  18. The rate of germination and growth of certain range grasses under experimental conditions

    E-Print Network [OSTI]

    Oxnam, Herbert Richard

    1951-01-01T23:59:59.000Z

    ;"ficienqp co stra~i~~ cry'; rr11 of vP!M dao ~ ~~+9~& for . ". t! acor arrdcm&rrrL!irr, o oc'~tv ic rosa% n. mf ~ ~rrctS. rrn 8xrrm. ". " . "-x' ~'. "~":rx r r 390'3b& "orror'I oro. 'Q sr ud&c !xg . 'oorro. " (1". 1' XXO'!, os~ (13%) srr3 ";~r, ' Vl an '- ~m...$il 'Aqgg5$5 g q gg Q 'Q Q Q 'Q Q Q '4@ 8'44ZC QQQ QSSQQ gang QQSQS 8%$8 %RA~ i 4'4/8 QRR R~gg WH C CC g 0 lac ~ ~ IIC 0 %SASH 8888 gQ gQ Cll W IA g ~gg ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ C4 0Ig QQ'QQ88 QQSQQ ~f Q 'RNCQ a" OO N i4%O ch ~ De...

  19. Cooperative Monitoring Center Occasional Paper/13: Cooperative monitoring for confidence building: A case study of the Sino-Indian border areas

    SciTech Connect (OSTI)

    SIDHU,WAHEGURU PAL SINGH; YUAN,JING-DONG; BIRINGER,KENT L.

    1999-08-01T23:59:59.000Z

    This occasional paper identifies applicable cooperative monitoring techniques and develops models for possible application in the context of the border between China and India. The 1993 and 1996 Sino-Indian agreements on maintaining peace and tranquility along the Line of Actual Control (LAC) and establishing certain confidence building measures (CBMs), including force reductions and limitation on military exercises along their common border, are used to examine the application of technically based cooperative monitoring in both strengthening the existing terms of the agreements and also enhancing trust. The paper also aims to further the understanding of how and under what conditions technology-based tools can assist in implementing existing agreements on arms control and confidence building. The authors explore how cooperative monitoring techniques can facilitate effective implementation of arms control agreements and CBMS between states and contribute to greater security and stability in bilateral, regional, and global contexts.

  20. Absorption of Nuclear Gamma-rays on the Starlight Radiation in FR I Sources: the Case of Centaurus A

    E-Print Network [OSTI]

    L. Stawarz; F. Aharonian; S. Wagner; M. Ostrowski

    2006-07-17T23:59:59.000Z

    Several BL Lac objects are confirmed sources of variable and strongly Doppler-boosted TeV emission produced in the nuclear portions of their relativistic jets. It is more than probable, that also many of the FR I radio galaxies, believed to be the parent population of BL Lacs, are TeV sources, for which Doppler-hidden nuclear gamma-ray radiation may be only too weak to be directly observed. Here we show, however, that about one percent of the total time-averaged TeV radiation produced by the active nuclei of low-power FR I radio sources is inevitably absorbed and re-processed by photon-photon annihilation on the starlight photon field, and the following emission of the created and quickly isotropized electron-positron pairs. In the case of the radio galaxy Centaurus A, we found that the discussed mechanism can give a distinctive observable feature in the form of an isotropic gamma-ray halo. It results from the electron-positron pairs injected to the interstellar medium of the inner parts of the elliptical host by the absorption process, and upscattering starlight radiation via the inverse-Compton process mainly to the GeV-TeV photon energy range. Such a galactic gamma-ray halo is expected to possess a characteristic spectrum peaking at ~0.1 TeV photon energies, and the photon flux strong enough to be detected by modern Cherenkov Telescopes and, in the future, by GLAST. These findings should apply as well to the other nearby FR I sources.

  1. Application of surface-enhanced Raman scattering (SERS) for the identification of anthraquinone dyes used in works of art

    SciTech Connect (OSTI)

    Chen, Kui [ORNL; Leona, Marco [ORNL; Yan, Fei [ORNL; Wabuyele, Musundi B [ORNL; Vo Dinh, Tuan [ORNL

    2006-04-01T23:59:59.000Z

    Surface-enhanced Raman scattering (SERS) was investigated for applications in the analysis of anthraquinone dyes used in works of art. Two SERS procedures were developed and evaluated with three frequently used anthraquinone dyes, alizarin, carminic acid and lac dye. The first procedure involves coating a layer of silver nanoparticles directly on pieces of filter paper stained with the dyes of interest by thermal evaporation to induce SERS effect. In the second procedure, a SERS-active Ag-Al{sub 2}O{sub 3} substrate was prepared by spin-coating an alumina-nanoparticle layer onto a glass slide to provide the nanostructure of the substrate, followed by thermally evaporating a layer of silver nanoparticles on top of the alumina layer. Aliquots of dye solutions were delivered onto this substrate to be analyzed. Intense SERS spectra characteristic of alizarin, carminic acid and lac dye were obtained using both SERS procedures. The effects of two parameters, the concentration of the alumina suspension and the thickness of the silver nanoparticle layer on the performance of the Ag-Al{sub 2}O{sub 3} substrate were examined with alizarin as the model compound. Comparative studies were conducted between the Ag-Al{sub 2}O{sub 3} substrate and the SERS substrate prepared using Tollens reaction. The Ag-Al{sub 2}O{sub 3} substrate was shown to offer larger enhancement and improved reproducibility than the Tollens substrates. Finally, the potential applicability of the Ag-Al{sub 2}O{sub 3} substrate for the analysis of real artifact objects was illustrated by the identification of alizarin extracted from a small piece of textile dyed using traditional methods and materials. The limit of detection for alizarin was estimated to be 7 x 10{sup -15} g from tests performed on solutions of known concentration.

  2. AGILE detection of variable gamma-ray activity from the blazar S5 0716+714 during September-October 2007

    E-Print Network [OSTI]

    F. D'Ammando; A. W. Chen; M. Villata; C. M. Raiteri; V. Vittorini; A. Bulgarelli; I. Donnarumma; A. Giuliani; F. Longo; L. Pacciani; G. Pucella; M. Tavani; S. Vercellone

    2008-08-27T23:59:59.000Z

    We report the gamma-ray activity from the Intermediate BL Lac S5 0716+714 during 2007 September-October observations by the AGILE satellite, coincident with a period of intense optical activity of the source monitored by GASP-WEBT. AGILE observed the source with its two co-aligned imagers, the Gamma-Ray Imaging Detector (GRID) and the hard X-ray imager (Super-AGILE) sensitive in the energy range 30 MeV-50 GeV and 18-60 keV respectively, in two different periods: the first between 4 and 23 September 2007, the second between 24 October and 1 November 2007. Over the period 7-12 September, AGILE detected gamma-ray emission from the source at a significance level of 9.6-sigma with an average flux (E>100 MeV) of (97+/-15) x 10^{-8} photons cm^{-2} s^{-1}, increasing by a factor of at least four within three days. No emission was detected by Super-AGILE in the energy range 18-60 keV, with a 3-sigma upper limit of 10 mCrab in 335 ksec. The gamma-ray flux of S5 0716+714 detected by AGILE is the highest ever detected for this blazar and one of the most intense gamma-ray fluxes detected from a BL Lac object. The Spectral Energy Distribution (SED) of mid-September seems to be consistent with the synchrotron self-Compton (SSC) emission model, but only by including two SSC components with different variability. In October 2007 AGILE repointed toward S5 0716+714 following an intense optical flare, measuring an average flux of (47+/-11) x 10^{-8} photons cm^{-2} s^{-1} at a significance level of 6.0-sigma. The gamma-ray flux during both AGILE pointings appears to be highly variable on timescales of 1 day.

  3. Lightning arrestor connector lead magnesium niobate qualification pellet test procedures.

    SciTech Connect (OSTI)

    Tuohig, W. (Honeywell FM& T, Kansas City, MO); Mahoney, Patrick A.; Tuttle, Bruce Andrew; Wheeler, Jill Susanne

    2009-02-01T23:59:59.000Z

    Enhanced knowledge preservation for DOE DP technical component activities has recently received much attention. As part of this recent knowledge preservation effort, improved documentation of the sample preparation and electrical testing procedures for lead magnesium niobate--lead titanate (PMN/PT) qualification pellets was completed. The qualification pellets are fabricated from the same parent powders used to produce PMN/PT lightning arrestor connector (LAC) granules at HWF&T. In our report, the procedures for fired pellet surface preparation, electrode deposition, electrical testing and data recording are described. The dielectric measurements described in our report are an information only test. Technical reasons for selecting the electrode material, electrode size and geometry are presented. The electrical testing is based on measuring the dielectric constant and dissipation factor of the pellet during cooling from 280 C to 220 C. The most important data are the temperature for which the peak dielectric constant occurs (Curie Point temperature) and the peak dielectric constant magnitude. We determined that the peak dielectric constant for our procedure would be that measured at 1 kHz at the Curie Point. Both the peak dielectric constant and the Curie point parameters provide semi-quantitative information concerning the chemical and microstructural homogeneity of the parent material used for the production of PMN/PT granules for LACs. Finally, we have proposed flag limits for the dielectric data for the pellets. Specifically, if the temperature of the peak dielectric constant falls outside the range of 250 C {+-} 30 C we propose that a flag limit be imposed that will initiate communication between production agency and design agency personnel. If the peak dielectric constant measured falls outside the range 25,000 {+-} 10,000 we also propose that a flag limit be imposed.

  4. Communicating Qualitative Risk to a Rural Audience

    SciTech Connect (OSTI)

    Vandergraaf, T.T. [Providence College, Otterburne, MB, R0A (Canada)

    2008-07-01T23:59:59.000Z

    Although many risk assessment involve complex mathematical models and a thorough understanding, communicating the risk to the general public can present a considerable challenge. Comprehending a 'one-in-a-million' risk some 10 000 years in the future can be a challenge to the average citizen who is surrounded by more imminent dangers and who has, by virtue of their familiarity, become immune to them. A number of years ago, the then Japan Atomic Energy Institute (JAERI) signed a multi-year cooperative agreement with Atomic Energy of Canada, Ltd (AECL) that included a number of self-contained radioisotope diffusion and migration experiments to be performed under in situ geochemical conditions in a specially designed radiochemistry laboratory at a depth of 240 metres in AECL's Underground Research Laboratory (URL) near Lac du Bonnet, Manitoba, Canada. This underground facility has been excavated in a previously undisturbed granite pluton in the Canadian Shield to study various aspects of high-level nuclear waste management. The region has been the home to AECL's Whiteshell Laboratories since the early 1960's and is surrounded by lakes, forests, some agriculture and mining activity. The economy of town, Lac du Bonnet is based on tourism, forestry, mining and agriculture. The relationship between Lac du Bonnet and AECL has generally been good although there have been attempts by a few local citizens, aided by antinuclear activists from Winnipeg, Manitoba's capital, to curtail the operation of the URL. Although the use of radioisotopes was approved by the then-Atomic Energy Control Board, the Canadian regulatory body, maintaining good working relations with the elected officials of the neighbouring communities was essential to the proposed radioisotope migration experiments. One reason for this was that minute quantities of radioisotope solutions needed to be transported over a distance of {approx}25 km between the URL and the Whiteshell Laboratories over public roads. As part of the public affairs program, the author, before his retirement from AECL, presented a comparison between the amounts of radioisotopes used in the migration experiments and those present in commonly used consumer products. This comparison proved to be adequate to gain the trust and support of the neighbouring communities. This trust was maintained by a rigorous communication program between the project manager and representatives of the local communities, environmental and law enforcement agencies. In summary: The need to present an experimental program to non-scientists presented a golden opportunity to relate the qualitative risk of using radioisotopes in a non-traditional environment to that associated with widely used consumer items and medical therapeutic and diagnostic materials. Although the amounts of radioisotopes used in these experiments are orders of magnitude lower than those in the disposal of nuclear wastes, the approach presented here may have merit in bridging the gap between the scientific community and the general public. The success of the approach used became clear when, towards the end of the experimental program, some of the elected officials expressed satisfaction with the extension of the program for new, a five-year, period. (authors)

  5. AGILE detection of variable gamma-ray activity from the blazar S5 0716+714 in September-October 2007

    E-Print Network [OSTI]

    A. W. Chen; F. D'Ammando; M. Villata; C. M. Raiteri; M. Tavani; V. Vittorini; A. Bulgarelli; I. Donnarumma; A. Ferrari; A. Giuliani; F. Longo; L. Pacciani; G. Pucella; S. Vercellone; A. Argan; G. Barbiellini; F. Boffelli; P. Caraveo; D. Carosati; P. W. Cattaneo; V. Cocco; E. Costa; E. Del Monte; G. De Paris; G. Di Cocco; Y. Evangelista; M. Feroci; M. Fiorini; T. Froysland; M. Frutti; F. Fuschino; M. Galli; F. Gianotti; O. M. Kurtanidze; C. Labanti; I. Lapshov; V. M. Larionov; F. Lazzarotto; P. Lipari; M. Marisaldi; M. Mastropietro; S. Mereghetti; E. Morelli; A. Morselli; M. Pasanen; A. Pellizzoni; F. Perotti; P. Picozza; G. Porrovecchio; M. Prest; M. Rapisarda; A. Rappoldi; A. Rubini; P. Soffitta; M. Trifoglio; A. Trois; E. Vallazza; A. Zambra; D. Zanello; S. Cutini; D. Gasparrini; C. Pittori; P. Santolamazza; F. Verrecchia; P. Giommi; L. A. Antonelli; S. Colafrancesco; L. Salotti

    2008-08-29T23:59:59.000Z

    We report the gamma-ray activity from the intermediate BL Lac S5 0716+714 during observations acquired by the AGILE satellite in September and October 2007. These detections of activity were contemporaneous with a period of intense optical activity, which was monitored by GASP-WEBT. This simultaneous optical and gamma-ray coverage allows us to study in detail the light curves, time lags, gamma-ray photon spectrum, and Spectral Energy Distributions (SEDs) during different states of activity. AGILE observed the source with its two co-aligned imagers, the Gamma-Ray Imaging Detector (GRID) and the hard X-ray imager (Super-AGILE), which are sensitive to the 30 MeV-50 GeV and 18-60 keV energy ranges, respectively. Observations were completed in two different periods, the first between 2007 September 4-23, and the second between 2007 October 24-November 1. Over the period 2007 September 7-12, AGILE detected gamma-ray emission from the source at a significance level of 9.6-sigma with an average flux (E>100 MeV) of (97 +/- 15) x 10^{-8} photons cm^{-2} s^{-1}, which increased by a factor of at least four within three days. No emission was detected by Super-AGILE for the energy range 18-60 keV to a 3-sigma upper limit of 10 mCrab in 335 ksec. In October 2007, AGILE repointed toward S5 0716+714 following an intense optical flare, measuring an average flux of (47 +/- 11) x 10^{-8} photons cm^{-2} s^{-1} at a significance level of 6.0-sigma. The gamma-ray flux of S5 0716+714 detected by AGILE is the highest ever detected for this blazar and one of the most intense gamma-ray fluxes detected from a BL Lac object. The SED of mid-September appears to be consistent with the synchrotron self-Compton (SSC) emission model, but only by including two SSC components of different variabilities.

  6. Redshift Limits of BL Lacertae Objects from Optical Spectroscopy

    E-Print Network [OSTI]

    J. D. Finke; J. C. Shields; M. Boettcher; S. Basu

    2007-11-13T23:59:59.000Z

    Context: BL Lacertae objects have been the targets for numerous recent multiwavelength campaigns, continuum spectral variability studies, and theoretical spectral and variability modeling. A meaningful interpretation of the results of such studies requires a reliable knowledge of the objects' redshifts; however, the redshifts for many are still unknown or uncertain. Aims: Therefore, we hope to determine or constrain the redshifts of six BL Lac objects with unknown or poorly known redshifts. Methods: Observations were made of these objects with the MDM 2.4 m Hiltner telescope. Although no spectral features were detected, and thus no redshifts could be measured, lower redshift limits were assigned to the objects based on the expected equivalent widths of absorption features in their host galaxies. Redshifts were also estimated for some objects by assuming the host galaxies are standard candles and using host galaxy apparent magnitudes taken from the literature. Results: The commonly used redshift of $z=0.102$ for 1219+285 is almost certainly wrong, while the redshifts of the other objects studied remain undetermined.

  7. The Need For High Resolution In Studies Of The 3-D Magnetic Field Structure Of AGN Jets

    E-Print Network [OSTI]

    Shane P. O'Sullivan; Denise C. Gabuzda

    2008-01-31T23:59:59.000Z

    We are using "broadband" (4.6 to 43 GHz) multi-frequency VLBA polarization observations of compact AGN to investigate the 3-D structure of their jet magnetic (B) fields. Observing at several frequencies, separated by short and long intervals, enables reliable determination of the distribution of Faraday Rotation, and thereby the intrinsic B field structure. Transverse Rotation Measure (RM) gradients were detected in the jets of 0954+658 and 1418+546, providing evidence for the presence of a helical B field surrounding the jet. The RM in the core regions of 2200+420 (BL Lac), 0954+658 and 1418+546 display different signs in different frequency-intervals (on different spatial scales); we suggest an explanation for this in terms of modest bends in a helical B field surrounding their jets. In future, polarization observations with a combination of VSOP-2 at 8, 22 and 43 GHz and ground arrays at frequencies with corresponding resolution will help map out the distributions of Faraday rotation, spectral index and the 3-D B field structure both across the jet and closer to the central engine, providing strong constraints for any jet B field models.

  8. Investigation of the Faraday Rotation Measure and Magnetic Field Structures of Several AGN Jets on Sub-Parsec to Parsec Scales

    E-Print Network [OSTI]

    Shane P. O'Sullivan; Denise C. Gabuzda

    2007-09-30T23:59:59.000Z

    Preliminary VLBA polarisation results on 6 ``blazars'' from 6.5-cm to 7-mm are presented here. Observing at several different wavelengths, separated by short and long intervals, enabled reliable information about the magnetic (B) field structure to be obtained and for the effect of Faraday Rotation to be determined and corrected. For all sources the magnitude of the core Rotation Measure (RM) derived from the shorter wavelength data was greater than that derived from the longer wavelength data, consistent with a higher electron density and/or B-field strength closer to the central engine. A transverse RM gradient was detected in the jet of 0954+658, providing evidence for the presence of a helical B-field surrounding the jet. The RM in the core region of 2200+420 (BL Lac) displays sign changes in different wavelength intervals (on different spatial scales); we suggest an explanation for this in terms of modest bends in a helical B-field surrounding the jet.

  9. The jet of Markarian 501 from millions of Schwarzschild radii down to a few hundreds

    E-Print Network [OSTI]

    M. Giroletti; G. Giovannini; W. D. Cotton; G. B. Taylor; M. A. Perez-Torres; M. Chiaberge; P. G. Edwards

    2008-07-11T23:59:59.000Z

    Aims: The TeV BL Lac object Markarian 501 is a complex, core dominated radio source, with a one sided, twisting jet on parsec scales. In the present work, we attempt to extend our understanding of the source physics to regions of the radio jet which have not been accessed before. Methods: We present new observations of Mrk 501 at 1.4 and 86 GHz. The 1.4 GHz data were obtained using the Very Large Array (VLA) and High Sensitivity Array (HSA) in November 2004, in full polarization, with a final r.m.s. noise of 25 microJy/beam in the HSA total intensity image; the 86 GHz observations were performed in October 2005 with the Global Millimeter VLBI Array (GMVA), providing an angular resolution as good as 110 x 40 microarcseconds. Results: The sensitivity and resolution provided by the HSA make it possible to detect the jet up to ~700 milliarcseconds (corresponding to a projected linear size of ~500 pc) from its base, while the superior resolution of the 86 GHz GMVA observations probes the innermost regions of the jet down to ~200 Schwarzschild radii. The brightness temperature at the jet base is in excess of 6e10 K. We find evidence of limb brightening on physical scales from <1 pc to ~40 pc. Polarization images and fits to the trend of jet width and brightness vs. distance from the core reveal a magnetic field parallel to the jet axis.

  10. Radiation fields of disk, BLR and torus in quasars and blazars: implications for gamma-ray absorption

    E-Print Network [OSTI]

    A. -C. Donea; R. J. Protheroe

    2002-02-04T23:59:59.000Z

    The radiation fields external to the jets and originating from within a few parsecs from the black hole, are discussed in this paper. They are the direct radiation from an accretion disk in symbiosis with jets, the radiation field from the broad line region (BLR) surrounding the accretion disk, and the infrared radiation from a dusty torus. The jet/disk symbiosis modifies the energetics in the central parsec of AGN such that for a given accretion rate, a powerful jet would occur at the expense of the disk luminosity, and consequently the disk would less efficiently ionize the BRL clouds or heat the dust in the torus, thereby affecting potentially important target photon fields for interactions of gamma-rays, accelerated electrons and protons along the jet. Motivated by unification schemes of active galactic nuclei, we briefly review the evidence for the existence of broad line regions and small-scale dust tori in BL Lacs and Fanaroff-Riley Class I (FR-I) radio galaxies. We propose that an existing jet-accretion disk symbiosis can be extrapolated to provide a large scale-symbiosis between other important dusty constituents of the blazar/FR-I family. In the present paper, we discuss in the context of this symbiosis interactions of GeV and TeV gamma-rays produced in the jet with the various radiation fields external to the jet in quasars and blazars, taking account the anisotropy of the radiation.

  11. MULTIWAVELENGTH OBSERVATIONS AND MODELING OF 1ES 1959+650 IN A LOW FLUX STATE

    SciTech Connect (OSTI)

    Aliu, E.; Errando, M. [Department of Physics and Astronomy, Barnard College, Columbia University, NY 10027 (United States); Archambault, S. [Physics Department, McGill University, Montreal, QC H3A 2T8 (Canada); Arlen, T.; Aune, T. [Department of Physics and Astronomy, University of California, Los Angeles, CA 90095 (United States); Beilicke, M.; Bugaev, V.; Dickherber, R. [Department of Physics, Washington University, St. Louis, MO 63130 (United States); Benbow, W. [Fred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, AZ 85645 (United States); Bird, R.; Collins-Hughes, E. [School of Physics, University College Dublin, Belfield, Dublin 4 (Ireland); Boettcher, M. [Astrophysical Institute, Department of Physics and Astronomy, Ohio University, Athens, OH 45701 (United States); Bouvier, A. [Santa Cruz Institute for Particle Physics and Department of Physics, University of California, Santa Cruz, CA 95064 (United States); Byrum, K. [Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439 (United States); Cesarini, A.; Connolly, M. P. [School of Physics, National University of Ireland Galway, University Road, Galway (Ireland); Ciupik, L. [Astronomy Department, Adler Planetarium and Astronomy Museum, Chicago, IL 60605 (United States); Cui, W. [Department of Physics, Purdue University, West Lafayette, IN 47907 (United States); Duke, C. [Department of Physics, Grinnell College, Grinnell, IA 50112-1690 (United States); Dumm, J. [School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455 (United States); and others

    2013-09-20T23:59:59.000Z

    We report on the VERITAS observations of the high-frequency peaked BL Lac object 1ES 1959+650 in the period 2007-2011. This source is detected at TeV energies by VERITAS at 16.4 standard deviation ({sigma}) significance in 7.6 hr of observation in a low flux state. A multiwavelength spectral energy distribution (SED) is constructed from contemporaneous data from VERITAS, Fermi-LAT, RXTE PCA, and Swift UVOT. Swift XRT data is not included in the SED due to a lack of simultaneous observations with VERITAS. In contrast to the orphan {gamma}-ray flare exhibited by this source in 2002, the X-ray flux of the source is found to vary by an order of magnitude, while other energy regimes exhibit less variable emission. A quasi-equilibrium synchrotron self-Compton model with an additional external radiation field is used to describe three SEDs corresponding to the lowest, highest, and average X-ray states. The variation in the X-ray spectrum is modeled by changing the electron injection spectral index, with minor adjustments of the kinetic luminosity in electrons. This scenario produces small-scale flux variability of the order of {approx}< 2 in the high energy (E > 1 MeV) and very high energy (E > 100 GeV) {gamma}-ray regimes, which is corroborated by the Fermi-LAT, VERITAS, and Whipple 10 m telescope light curves.

  12. DISCOVERY OF A NEW TeV GAMMA-RAY SOURCE: VER J0521+211

    SciTech Connect (OSTI)

    Archambault, S. [Physics Department, McGill University, Montreal, QC H3A 2T8 (Canada); Arlen, T.; Aune, T. [Department of Physics and Astronomy, University of California, Los Angeles, CA 90095 (United States); Behera, B.; Federici, S. [DESY, Platanenallee 6, D-15738 Zeuthen (Germany); Beilicke, M.; Buckley, J. H.; Bugaev, V. [Department of Physics, Washington University, St. Louis, MO 63130 (United States); Benbow, W. [Fred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, AZ 85645 (United States); Bird, R. [School of Physics, University College Dublin, Belfield, Dublin 4 (Ireland); Bouvier, A. [Santa Cruz Institute for Particle Physics and Department of Physics, University of California, Santa Cruz, CA 95064 (United States); Byrum, K. [Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439 (United States); Cesarini, A.; Connolly, M. P. [School of Physics, National University of Ireland Galway, University Road, Galway (Ireland); Ciupik, L. [Astronomy Department, Adler Planetarium and Astronomy Museum, Chicago, IL 60605 (United States); Cui, W.; Feng, Q.; Finley, J. P. [Department of Physics, Purdue University, West Lafayette, IN 47907 (United States); Errando, M. [Department of Physics and Astronomy, Barnard College, Columbia University, NY 10027 (United States); Falcone, A., E-mail: fortin@veritas.sao.arizona.edu, E-mail: errando@astro.columbia.edu, E-mail: jholder@physics.udel.edu, E-mail: sfegan@llr.in2p3.fr [Department of Astronomy and Astrophysics, 525 Davey Lab, Pennsylvania State University, University Park, PA 16802 (United States); Collaboration: VERITAS Collaboration; and others

    2013-10-20T23:59:59.000Z

    We report the detection of a new TeV gamma-ray source, VER J0521+211, based on observations made with the VERITAS imaging atmospheric Cherenkov Telescope Array. These observations were motivated by the discovery of a cluster of >30 GeV photons in the first year of Fermi Large Area Telescope observations. VER J0521+211 is relatively bright at TeV energies, with a mean photon flux of (1.93 0.13{sub stat} 0.78{sub sys}) 10{sup 11} cm{sup 2} s{sup 1} above 0.2 TeV during the period of the VERITAS observations. The source is strongly variable on a daily timescale across all wavebands, from optical to TeV, with a peak flux corresponding to ?0.3 times the steady Crab Nebula flux at TeV energies. Follow-up observations in the optical and X-ray bands classify the newly discovered TeV source as a BL Lac-type blazar with uncertain redshift, although recent measurements suggest z = 0.108. VER J0521+211 exhibits all the defining properties of blazars in radio, optical, X-ray, and gamma-ray wavelengths.

  13. Candidate isolated neutron stars and other optically blank x-ray fields identified from the rosat all-sky and sloan digital sky surveys

    SciTech Connect (OSTI)

    Agueros, Marcel A.; Anderson, Scott F.; /Washington U., Seattle, Astron. Dept.; Margon, Bruce; /Baltimore, Space Telescope Sci.; Haberl, Frank; Voges, Wolfgang; /Garching,; Annis, James; /Fermilab; Schneider, Donald P.; /Penn State U., Astron. Astrophys.; Brinkmann, Jonathan; /Apache Point Observ.

    2005-11-01T23:59:59.000Z

    Only seven radio-quiet isolated neutron stars (INSs) emitting thermal X rays are known, a sample that has yet to definitively address such fundamental issues as the equation of state of degenerate neutron matter. We describe a selection algorithm based on a cross-correlation of the ROSAT All-Sky Survey (RASS) and the Sloan Digital Sky Survey (SDSS) that identifies X-ray error circles devoid of plausible optical counterparts to the SDSS g {approx} 22 magnitudes limit. We quantitatively characterize these error circles as optically blank; they may host INSs or other similarly exotic X-ray sources such as radio-quiet BL Lacs, obscured AGN, etc. Our search is an order of magnitude more selective than previous searches for optically blank RASS error circles, and excludes the 99.9% of error circles that contain more common X-ray-emitting subclasses. We find 11 candidates, nine of which are new. While our search is designed to find the best INS candidates and not to produce a complete list of INSs in the RASS, it is reassuring that our number of candidates is consistent with predictions from INS population models. Further X-ray observations will obtain pinpoint positions and determine whether these sources are entirely optically blank at g {approx} 22, supporting the presence of likely isolated neutron stars and perhaps enabling detailed follow-up studies of neutron star physics.

  14. Test particle acceleration by rotating jet magnetospheres

    E-Print Network [OSTI]

    F. M. Rieger; K. Mannheim

    2000-11-01T23:59:59.000Z

    Centrifugal acceleration of charged test particles at the base of a rotating jet magnetosphere is considered. Based on an analysis of forces we derive the equation for the radial accelerated motion and present an analytical solution. It is shown that for particles moving outwards along rotating magnetic field lines, the energy gain is in particular limited by the breakdown of the bead-on-the-wire approximation which occurs in the vicinity of the light cylinder $r_{L}$. The corresponding upper limit for the maximum Lorentz factor $\\gamma_{max}$ for electrons scales $\\propto B^{2/3} r_{L}^{2/3}$, with $B$ the magnetic field strength at $r_{L}$, and is at most of the order of a $10^2-10^3$ for the conditions regarded to be typical for BL Lac objects. Such values suggest that this mechanism may provide pre-accelerated seed particles which are required for efficient Fermi-type particle acceleration at larger scales in radio jets.

  15. Plectoneme tip bubbles: Coupled denaturation and writhing in supercoiled DNA

    E-Print Network [OSTI]

    Christian Matek; Thomas E. Ouldridge; Jonathan P. K. Doye; Ard A. Louis

    2014-04-10T23:59:59.000Z

    Biological information is not only stored in the digital chemical sequence of double helical DNA, but is also encoded in the mechanical properties of the DNA strands, which can influence biochemical processes involving its readout. For example, loop formation in the Lac operon can regulate the expression of key genes, and DNA supercoiling is closely correlated to rhythmic circardian gene expression in cyanobacteria. Supercoiling is also important for large scale organisation of the genome in both eukaryotic and prokaryotic cells. DNA can respond to torsional stress by writhing to form looped structures called plectonemes, thus transferring energy stored as twist into energy stored in bending. Denaturation bubbles can also relax torsional stress, with the enthalpic cost of breaking bonds being compensated by their ability to absorb undertwist. Here we predict a novel regime where bubbles form at the tips of plectonemes, and study its properties using coarse-grained simulations. These tip bubbles can occur for both positive and negative supercoiling and greatly reduce plectoneme diffusion by a pinning mechanism. They can cause plectonemes to preferentially localise to AT rich regions, because bubbles more easily form there. The tip-bubble regime occurs for supercoiling densities and forces that are typically encountered for DNA in vivo, and may be exploited for biological control of genomic processes.

  16. Detection of phenols using engineered bacteria

    DOE Patents [OSTI]

    Wise, Arlene A. (Philadelphia, PA); Kuske, Cheryl R. (Los Alamos, NM); Terwilliger, Thomas C. (Santa Fe, NM)

    2007-12-04T23:59:59.000Z

    Detection of phenols using engineered bacteria. A biosensor can be created by placing a reporter gene under control of an inducible promoter. The reporter gene produces a signal when a cognate transcriptional activator senses the inducing chemical. Creation of bacterial biosensors is currently restricted by limited knowledge of the genetic systems of bacteria that catabolize xenobiotics. By using mutagenic PCR to change the chemical specificity of the Pseudomonas species CF600 DmpR protein, the potential for engineering novel biosensors for detection of phenols has been demonstrated. DmpR, a well-characterized transcriptional activator of the P. CF600's dmp operon mediates growth on simple phenols. Transcription from Po, the promoter heading the dmp operon, is activated when the sensor domain of DmpR interacts with phenol and mono-substituted phenols. By altering the sensor domain of the DmpR, a group of DmpR derivatives that activate transcription of a Po-lacZ fusion in response to eight of the EPA's eleven priority pollutant phenols has been created. The assays and the sensor domain mutations that alter the chemical specificity of DmpR is described.

  17. Detection of phenols using engineered bacteria

    DOE Patents [OSTI]

    Wise, Arlene A.; Kuske, Cheryl R.; Terwilliger, Thomas C.

    2004-08-10T23:59:59.000Z

    Detection of phenols using engineered bacteria. A biosensor can be created by placing a reporter gene under control of an inducible promoter. The reporter gene produces a signal when a cognate transcriptional activator senses the inducing chemical. Creation of bacterial biosensors is currently restricted by limited knowledge of the genetic systems of bacteria that catabolize xenobiotics. By using mutagenic PCR to change the chemical specificity of the Pseudomonas species CF600 DmpR protein, the potential for engineering novel biosensors for detection of phenols has been demonstrated. DmpR, a well-characterized transcriptional activator of the P. CF600's dmp operon mediates growth on simple phenols. Transcription from Po, the promoter heading the dmp operon, is activated when the sensor domain of DmpR interacts with phenol and mono-substituted phenols. By altering the sensor domain of the DmpR, a group of DmpR derivatives that activate transcription of a Po-lacZ fusion in response to eight of the EPA's eleven priority pollutant phenols has been created. The assays and the sensor domain mutations that alter the chemical specificity of DmpR is described.

  18. Coal-Oil Mixtures - A U. S. State of the Art Review

    E-Print Network [OSTI]

    Kapp, G. S.

    1982-01-01T23:59:59.000Z

    .ortJ.>ume.d 6ue.?.J.>. COM v., no e.xc.e.p fun: In 6ac.t, the. .6av,t,Ylg.6 on the. 6ue.?. mU.6t pltO v,t,de. a U.6 en wah hb., Yl 01UniLt lte;(:uJtn a n ,t,nvutme.nt 601t the. 1te.t!t06dting lte.qu,{.Jte.d in hb., plant to be. able. to bUILn COM. The. C....c.hnology, c.U!t!te.YL-t o,{,f pJt,{.c.,{,ytg and a de.plte.Me.d e.c.onomy do not 066en mO.6t U.6e.M ade.quate. .6av,t,ng.6 le.ve.?.J.> 601t the.m to obta.(n thw c.U!t!te.nt lte.qu,{.Jte.d ltatu 06 lte;(:uJtn. The..6e. 6ac.tOM c.omb,t,ne.d wah the. lac.k 06...

  19. Gamma-Ray Active Galactic Nucleus Type through Machine-Learning Algorithms

    E-Print Network [OSTI]

    Hassan, T; Contreras, J L; Oya, I

    2012-01-01T23:59:59.000Z

    The Fermi Gamma-ray Space Telescope is producing the most detailed inventory of the gamma-ray sky to date. Despite tremendous achievements approximately 25% of all Fermi extragalactic sources in the Second Fermi LAT Catalogue (2FGL) are listed as active galactic nuclei (AGN) of uncertain type. Typically, these are suspected blazar candidates without a conclusive optical spectrum or lacking spectroscopic observations. Here, we explore the use of machine-learning algorithms - Random Forests and Support Vector Machines - to predict specific AGN subclass based on observed gamma-ray spectral properties. After training and testing on identified/associated AGN from the 2FGL we find that 235 out of 269 AGN of uncertain type have properties compatible with gamma-ray BL Lacs and flat-spectrum radio quasars with accuracy rates of 85%. Additionally, direct comparison of our results with class predictions made following the infrared colour-colour space of Massaro et al. (2012) show that the agreement rate is over four-fif...

  20. Optical Nuclei of Radio-loud AGN and the Fanaroff-Riley Divide

    E-Print Network [OSTI]

    P. Kharb; P. Shastri

    2004-08-16T23:59:59.000Z

    We investigate the nature of the point-like optical ``cores'' that have been found in the centres of the host galaxies of a majority of radio galaxies by the Hubble Space Telescope. We examine the evidence that these optical cores are relativistically beamed, and look for differences in the behaviour of the cores found in radio galaxies of the two Fanaroff-Riley types. We also attempt to relate this behaviour to the properties of the optical nuclei in their highly beamed counterparts (the BL Lac objects and radio-loud quasars) as hypothesized by the simple Unified Scheme. Simple model-fitting of the data suggests that the emission may be coming from a non-thermal relativistic jet. It is also suggestive that the contribution from an accretion disk is not significant for the FRI objects and for the narrow-line radio galaxies of FRII type, while it may be significant for the Broad-line objects, and consistent with the idea that the FRII optical cores seem to suffer from extinction due to an obscuring torus while the FRI optical cores do not. These results are in agreement with the Unified Scheme for radio-loud AGNs.

  1. Discovery of Very High Energy Gamma Rays from PKS 1424+240 and Multiwavelength Constraints on its Redshift

    SciTech Connect (OSTI)

    Acciari, V.A.; /Harvard-Smithsonian Ctr. Astrophys.; Aliu, E.; /Delaware U., Bartol Inst.; Arlen, T.; /UCLA; Aune, T.; /UC, Santa Cruz; Bautista, M.; /McGill U.; Beilicke, M. /Washington U., St. Louis; Benbow, W.; /Harvard-Smithsonian Ctr. Astrophys.; Bottcher, M.; /Ohio U.; Boltuch, D.; /Delaware U., Bartol Inst.; Bradbury, S.M.; /Leeds U.; Buckley, J.H.; /Washington U., St. Louis; Bugaev, V.; /Washington U., St. Louis; Byrum, K.; /Argonne; Cannon, A.; /University Coll., Dublin; Cesarini, A.; /Natl. U. of Ireland, Galway; Chow, Y.C.; /UCLA; Ciupik, L.; /Roosevelt U., Chicago; Cogan, P.; /McGill U.; Cui, W.; /Purdue U.; Duke, C.; /Grinnell Coll.; Falcone, A.; /Penn State U. /Purdue U. /Utah U. /Roosevelt U., Chicago /Harvard-Smithsonian Ctr. Astrophys. /Purdue U. /Natl. U. of Ireland, Galway /Utah U. /University Coll., Dublin /McGill U. /Roosevelt U., Chicago /McGill U. /Delaware U., Bartol Inst. /Utah U. /Chicago U., EFI /Iowa State U. /Roosevelt U., Chicago /DePauw U. /Utah U. /Pittsburg State U. /Washington U., St. Louis /Iowa State U. /Natl. U. of Ireland, Galway /Utah U. /McGill U. /Washington U., St. Louis /McGill U. /McGill U. /Purdue U. /Anderson U. /Galway-Mayo Inst. of Tech. /Iowa State U. /UCLA; /more authors..

    2012-04-05T23:59:59.000Z

    We report the first detection of very-high-energy (VHE) gamma-ray emission above 140GeV from PKS 1424+240, a BL Lac object with an unknown redshift. The photon spectrum above 140GeV measured by VERITAS is well described by a power law with a photon index of 3.8 {+-}0.5{sub stat} {+-} 0.3{sub syst} and a flux normalization at 200 GeV of (5.1 {+-} 0.9{sub stat} {+-} 0.5{sub syst}) x 10{sup -11} TeV{sup -1} cm{sup -2} s{sup -1}, where stat and syst denote the statistical and systematical uncertainty, respectively. The VHE flux is steady over the observation period between MJD 54881 and 55003 (2009 February 19 to June 21). Flux variability is also not observed in contemporaneous high energy observations with the Fermi Large Area Telescope (LAT). Contemporaneous X-ray and optical data were also obtained from the Swift XRT and MDM observatory, respectively. The broadband spectral energy distribution (SED) is well described by a one-zone synchrotron self-Compton (SSC) model favoring a redshift of less than 0.1. Using the photon index measured with Fermi in combination with recent extragalactic background light (EBL) absorption models it can be concluded from the VERITAS data that the redshift of PKS 1424+240 is less than 0.66.

  2. 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.

  3. Broadband Spectra and Variability of BL Lacertae in 2000

    E-Print Network [OSTI]

    Bttcher, 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...

  4. THE OPTICAL MICROVARIABILITY AND SPECTRAL CHANGES OF THE BL LACERTAE OBJECT S5 0716+714

    SciTech Connect (OSTI)

    Poon, H.; Fu, J. N. [Astronomy Department, Beijing Normal University, Beijing 100875 (China); Fan, J. H. [Center for Astrophysics, Guangzhou University, Guangzhou 510006 (China)], E-mail: china_108@yahoo.com

    2009-12-01T23:59:59.000Z

    We monitored the BL Lac object S5 0716+714 in the optical band during 2008 October and December and 2009 February with a best temporal resolution of about 5 minutes in the BVRI bands. Four fast flares were observed with amplitudes ranging from 0.3 to 0.75 mag. The source remained active during the whole monitoring campaign, showing microvariability in all days except for one. The overall variability amplitudes are {delta}B {approx} 0fm89, {delta}V {approx} 0fm80, {delta}R {approx} 0fm73, and {delta}I{approx} 0fm51. Typical timescales of microvariability range from 2 to 8 hr. The overall V - R color index ranges from 0.37 to 0.59. Strong bluer-when-brighter chromatism was found on internight timescales. However, a different spectral behavior was found on intranight timescales. A possible time lag of {approx}11 minutes between B and I bands was found on one night. The shock-in-jet model and geometric effects can be applied to explain the source's intranight behavior.

  5. Jet outflow and gamma-ray emission correlations in S5 0716+714

    E-Print Network [OSTI]

    Rani, B; Marscher, A P; Jorstad, S G; Hodgson, J A; Fuhrmann, L; Zensus, J A

    2014-01-01T23:59:59.000Z

    Using millimeter-very long baseline interferometry (VLBI) observations of the BL Lac object S5 0716+714 from August 2008 to September 2013, we investigate variations in the core flux density and orientation of the sub-parsec scale jet i.e. position angle. The gamma-ray data obtained by the Fermi-LAT (Large Area Telescope) are used to investigate the high-energy flux variations over the same time period. For the first time in any blazar, we report a significant correlation between the gamma-ray flux variations and the position angle (PA) variations in the VLBI jet. The cross-correlation analysis also indicates a positive correlation such that the mm-VLBI core flux density variations are delayed with respect to the gamma-ray flux by 82$\\pm$32 days. This suggests that the high-energy emission is coming from a region located $\\geq$(3.8$\\pm$1.9) parsecs upstream of the mm-VLBI core (closer to the central black hole). These results imply that the observed inner jet morphology has a strong connection with the observ...

  6. Intra-day variability observations of S5 0716+714 over 4.5 years at 4.8 GHz

    E-Print Network [OSTI]

    Liu, X; Marchili, N; Liu, B -R; Liu, J; Krichbaum, T P; Fuhrmann, L; Zensus, J A

    2012-01-01T23:59:59.000Z

    We aim to search for evidence of annual modulation in the time scales of the BL Lac object S5 0716+714. The intra-day variability (IDV) observations were carried out monthly from 2005 to 2009, with the Urumqi 25m radio telescope at 4.8 GHz. The source has shown prominent IDV as well as long-term flux variations. The IDV time scale does show evidence in favor of an annual modulation, suggesting that the IDV of 0716+714 is dominated by interstellar scintillation. The source underwent a strong outburst phase between mid-2008 and mid-2009; a second intense flare was observed in late 2009, but no correlation between the total flux density and the IDV time scale is found, implying that the flaring state of the source does not have serious implications for the general characteristics of its intra-day variability. However, we find that the inner-jet position angle is changing throughout the years, which could result in an annual modulation noise in the anisotropic ISS model fit. There is also an indication that the l...

  7. Detection of Polarimetric Variations Associated with the Shortest Time-Scale Variability in S5 0716$ + $714

    E-Print Network [OSTI]

    Mahito Sasada; Makoto Uemura; Akira Arai; Yasushi Fukazawa; Koji S. Kawabata; Takashi Ohsugi; Takuya Yamashita; Mizuki Isogai; Shuji Sato; Masaru Kino

    2008-12-08T23:59:59.000Z

    We present the result of near-infrared and optical observations of the BL Lac object S5 0716$ + $714 carried out by the KANATA telescope. S5 0716$ + $714 has both a long term high-amplitude variability and a short-term variability within a night. The shortest variability (microvariability) time-scale is important for understanding the geometry of jets and magnetic field, because it provides a possible minimum size of variation sources. Here, we report the detection of 15-min variability in S5 0716$ + $714, which is one of the shortest time-scales in optical and near-infrared variations observed in blazars. The detected microvariation had an amplitude of $0.061{\\pm}0.005$ mag in $V$ band and a blue color of $\\Delta(V-J)=-0.025{\\pm}0.011$. Furthermore, we successfully detected an unprecedented, short time-scale polarimetric variation which correlated with the brightness change. We revealed that the microvariation had a specific polarization component. The polarization degree of the variation component was higher than that of the total flux. These results suggest that the microvariability originated from a small and local region where the magnetic field is aligned.

  8. Radio to gamma-ray variability study of blazar S5 0716+714

    E-Print Network [OSTI]

    Rani, B; Fuhrmann, L; Boettcher, M; Lott, B; Aller, H D; Aller, M F; Angelakis, E; Bach, U; Bastieri, D; Falcone, A D; Fukazawa, Y; Gabanyi, K E; Gupta, A C; Gurwell, M; Itoh, R; Kawabata, K S; Krips, M; Lhteenmki, A A; Liu, X; Marchili, N; Max-Moerbeck, W; Nestoras, I; Nieppola, E; Quintana-Lacaci, G; Readhead, A C S; Richards, J L; Sasada, M; Sievers, A; Sokolovsky, K; Stroh, M; Tammi, J; Tornikoski, M; Uemura, M; Ungerechts, H; Urano, T; Zensus, J A

    2013-01-01T23:59:59.000Z

    We present the results of a series of radio, optical, X-ray and gamma-ray observations of the BL Lac object S50716+714 carried out between April 2007 and January 2011. The multi-frequency observations were obtained using several ground and space based facilities. The intense optical monitoring of the source reveals faster repetitive variations superimposed on a long-term variability trend at a time scale of ~350 days. Episodes of fast variability recur on time scales of ~ 60-70 days. The intense and simultaneous activity at optical and gamma-ray frequencies favors the SSC mechanism for the production of the high-energy emission. Two major low-peaking radio flares were observed during this high optical/gamma-ray activity period. The radio flares are characterized by a rising and a decaying stage and are in agreement with the formation of a shock and its evolution. We found that the evolution of the radio flares requires a geometrical variation in addition to intrinsic variations of the source. Different estima...

  9. Optical-IUE observations of the gamma-ray loud BL Lacertae object S5 0716+714: data and interpretation

    E-Print Network [OSTI]

    G. Ghisellini; M. Villata; C. M. Raiteri; S. Bosio; G. De Francesco; G. Latini; M. Maesano; E. Massaro; F. Montagni; R. Nesci; G. Tosti; M. Fiorucci; E. Pian; L. Maraschi; A. Treves; A. Comastri; M. Mignoli

    1997-06-25T23:59:59.000Z

    We monitored the BL Lac object S5 0716+714 in the optical band during the period November 1994-April 1995, which includes the time of a gamma-ray observation by the Energetic Gamma Ray Experiment Telescope (EGRET) on February 14--28, 1995. The light curves in the R and B bands show fast fluctuations superimposed on longer timescale variations. The color index correlates with intensity during the rapid flares (the spectrum is flatter when the flux is higher), but it is rather insensitive to the long term trends. Over the 5 month observational period the light curve shows an overall brightening of about 1 mag followed by a fast decline. The EGRET pointing covers part of the very bright phase (V about 13.2) and the initial decline. An ultraviolet spectrum was also obtained with the International Ultraviolet Explorer (IUE) (1200-3000 A) during the EGRET observations. The variability of the optical emission of S5 0716+714 by itself sets important constraints on the magnetic field strength and on the physical processes responsible for it. Interpreting the whole electromagnetic spectrum with synchrotron self Compton models leads to the prediction of a bright gamma-ray state during the EGRET pointing. We discuss how the gamma-ray data could be used as a diagnostic of the proposed models.

  10. The 'Crazy Diamond' (and other blazars)

    SciTech Connect (OSTI)

    Vercellone, S. [INAF/IASF Milano, Via Bassini 15, 20133 Milano (Italy); INAF/IASF Palermo, Via Ugo La Malfa 153, 90146 Palermo (Italy); Donnarumma, I.; Pacciani, L.; Pucella, G.; Vittorini, V. [INAF/IASF Roma, Via Fosso del Cavaliere 100, 00133 Roma (Italy); Bulgarelli, A. [INAF/IASF Bologna, Via Gobetti 101, 40129 Bologna (Italy); Chen, A. W. [CIFS-Torino, Viale Settimio Severo 3, 10133 Torino (Italy); INAF/IASF Milano, Via Bassini 15, 20133 Milano (Italy); D'Ammando, F.; Tavani, M. [INAF/IASF Roma, Via Fosso del Cavaliere 100, 00133 Roma (Italy); Dip. di Fisica, Univ. 'Tor Vergata', Via della Ricerca Scientifica 1, 00133 Roma (Italy); Giuliani, A. [INAF/IASF Milano, Via Bassini 15, 20133 Milano (Italy); Longo, F. [Dip. di Fisica and INFN, Via Valerio 2, 34127 Trieste (Italy)

    2009-04-08T23:59:59.000Z

    During the first year of observations, AGILE detected several blazars at high significance: 3 C 279, 3C 454.3, PKS 1510-089, S5 0716+714, 3 C 273, MKN 421, and W Comae. We obtained long-term coverage of the Crazy Diamond 3 C 454.3, for more than 100 days at energies above 100 MeV. 3 C 273 was the first blazar detected simultaneously by the AGILE gamma-ray imaging detector and by its hard X-ray monitor. S5 0716+714, an intermediate BL Lac object, exhibited a very fast and intense gamma-ray transient event during an optical high-state phase, while MKN 421 and W Comae where detected during an AGILE target of opportunity (ToO) repointing. Thanks to the rapid dissemination of our alerts, we were able to obtain multi-wavelength ToO data from other observatories such as Spitzer, Swift, INTEGRAL, RXTE, Suzaku, MAGIC, VERITAS, as well as optical coverage by means of the WEBT Consortium and REM.

  11. Multi-band optical-NIR variability of blazars on diverse timescales

    E-Print Network [OSTI]

    Agarwal, Aditi; Bachev, R; Strigachev, A; Semkov, E; Wiita, Paul J; Bottcher, M; Boeva, S; Gaur, H; Gu, M F; Peneva, S; Ibryamov, S; Pandey, U S

    2015-01-01T23:59:59.000Z

    To search for optical variability on a wide range of timescales, we have carried out photometric monitoring of two flat spectrum radio quasars, 3C 454.3 and 3C 279, plus one BL Lac, S5 0716+714, all of which have been exhibiting remarkably high activity and pronounced variability at all wavelengths. CCD magnitudes in B, V, R and I pass-bands were determined for $\\sim$ 7000 new optical observations from 114 nights made during 2011 - 2014, with an average length of $\\sim$ 4 h each, at seven optical telescopes: four in Bulgaria, one in Greece, and two in India. We measured multiband optical flux and colour variations on diverse timescales. Discrete correlation functions were computed among B, V, R, and I observations, to search for any time delays. We found weak correlations in some cases with no significant time lags. The structure function method was used to estimate any characteristic time-scales of variability. We also investigated the spectral energy distribution of the three blazars using B, V, R, I, J and...

  12. Detection of the host galaxy of S5 0716+714

    E-Print Network [OSTI]

    K. Nilsson; T. Pursimo; A. Sillanp; L. O. Takalo; E. Lindfors

    2008-07-01T23:59:59.000Z

    We have acquired a deep i-band image of the BL Lacertae object S5 0716+714 while the target was in an low optical state. Due to the faintness of the nucleus, we were able to detect the underlying host galaxy. The host galaxy is measured to have an I-band magnitude of 17.5 +- 0.5 and an effective radius of (2.7 +- 0.8) arcsec. Using the host galaxy as a ``standard candle'', we derive z = 0.31 +- 0.08 (1 sigma error) for the host galaxy of S5 0716+714. This redshift is consistent with the redshift z = 0.26 determined by spectroscopy for 3 galaxies close to S5 0716+714. The effective radius at z = 0.31 would be 12 +- 4 kpc, which is consistent with values obtained for BL Lac host galaxies. An optical spectrum acquired during the same epoch shows no identifiable spectral lines.

  13. High precision difference astrometry applied to the triplet of S5 radio sources B1803+784/Q1928+738/B2007+777

    E-Print Network [OSTI]

    E. Ros; J. M. Marcaide; J. C. Guirado; M. I. Ratner; I. I. Shapiro; T. P. Krichbaum; A. Witzel; R. A. Preston

    1999-07-05T23:59:59.000Z

    We determined the separations of the radio sources in the triangle formed by the BL Lac objects 1803+784 and 2007+777, and the QSO 1928+738 from intercontinental interferometric observations carried out in November 1991 at the frequencies of 2.3 and 8.4 GHz simultaneously. We successfully connected differenced phase delays over 7^o on the sky at 8.4 GHz at an epoch of maximum solar activity. The effects of the ionosphere on these VLBI data were mostly removed by estimates of the total electron content from observations of GPS satellites. The comparison of the estimated separation of QSO 1928+738 and BL 2007+777 with previous such estimates obtained from data at different epochs leads us to a particular alignment of the maps of QSO 1928+738 at different epochs relative to those of BL 2007+777, although with significant uncertainty. For this alignment, the jet components of QSO 1928+738 show a mean proper motion of 0.32+/-0.10 mas/yr and also suggest an identification for the position of the core of this radio source.

  14. Plasmids encoding therapeutic agents

    DOE Patents [OSTI]

    Keener, William K. (Idaho Falls, ID)

    2007-08-07T23:59:59.000Z

    Plasmids encoding anti-HIV and anti-anthrax therapeutic agents are disclosed. Plasmid pWKK-500 encodes a fusion protein containing DP178 as a targeting moiety, the ricin A chain, an HIV protease cleavable linker, and a truncated ricin B chain. N-terminal extensions of the fusion protein include the maltose binding protein and a Factor Xa protease site. C-terminal extensions include a hydrophobic linker, an L domain motif peptide, a KDEL ER retention signal, another Factor Xa protease site, an out-of-frame buforin II coding sequence, the lacZ.alpha. peptide, and a polyhistidine tag. More than twenty derivatives of plasmid pWKK-500 are described. Plasmids pWKK-700 and pWKK-800 are similar to pWKK-500 wherein the DP178-encoding sequence is substituted by RANTES- and SDF-1-encoding sequences, respectively. Plasmid pWKK-900 is similar to pWKK-500 wherein the HIV protease cleavable linker is substituted by a lethal factor (LF) peptide-cleavable linker.

  15. Gamma-Ray Bursts from Radio-Quiet Quasars

    E-Print Network [OSTI]

    N. Schartel; H. Andernach; J. Greiner

    1996-12-16T23:59:59.000Z

    We study positional coincidences between gamma-ray bursts in the BATSE 3B catalogue and quasars/AGN taken from the Veron-Cetty & Veron compilation. For most classes of AGN, for BL Lac objects and for radio-loud quasars, we find no excess coincidences above random expectation, and we give upper limits for their burst emission rate. However, surprising evidence is found for a positional correlation between gamma-ray bursts and radio-quiet quasars. A total of 134 selected bursts with a position error radius 99.7% to be associated with each other. An analysis of a smaller sample of well-localized interplanetary network gamma-ray burst positions supports this result. This correlation strongly favours the cosmological origin of gamma-ray bursts and enables to estimate its distance scale. The average luminosity of those gamma-ray bursts which we associate directly with radio-quiet quasars is of the order of 4*10^52 erg (assuming isotropic emission).

  16. Localization and cloning of the gene(s) of bacteriophage PM2 responsible for membrane morphogenesis

    SciTech Connect (OSTI)

    Armour, G.A.

    1988-01-01T23:59:59.000Z

    Proteins implicated in membrane morphogenesis (sp6.6 and sp13) have been previously identified by analysis of membrane proteins in the membrane of the purified phage. Analysis of a ts viral mutant that produces empty membrane vesicles also indicated the unique presence of viral structural protein sp6.6. In this work the gene for sp6.6 was localized on the PM2 genome by in vitro coupled transcription-translation directed by restriction endonuclease fragments of PM2 DNA. A Hind III fragment containing the sp6.6 gene among others was cloned into pBR322 in E. coli. Examination with the electron microscope revealed the production of new membrane vesicles whose size were similar to that of the natural membrane of PM2. Clones were then constructed in the pUC family of plasmids which uses the Lac promoter and pPL-lambda which uses the promoter left of lambda. pUC clones were unable to produce vesicles or detectable sp6.6. A pPL-lambda clone was produced 3.5 Kbp in size, that produced p6.6 as detected by SDS-PAGE of radiolabeled protein and immunoblotting.

  17. A sample of weak blazars at milli-arcsecond resolution

    E-Print Network [OSTI]

    Mantovani, F; Mack, K -H; Alef, W; Ros, E; Zensus, J A

    2015-01-01T23:59:59.000Z

    We started a follow-up investigation of the Deep X-ray Radio Blazar Survey objects with declination >-10 deg. We undertook a survey with the EVN at 5GHz to make the first images of a complete sample of weak blazars, aiming at a comparison between high- and low-power samples of blazars. All of the 87 sources observed were detected. Point-like sources are found in 39 cases, and 48 show core-jet structure. According to the spectral indices previously obtained, 58 sources show a flat spectral index, and 29 sources show a steep spectrum or a spectrum peaking at a frequency around 1-2 GHz. Adding to the DXRBS objects we observed those already observed with ATCA in the southern sky, we found that 14 blazars and a SSRQ, are associated to gamma-ray emitters. We found that 56 sources can be considered blazars. We also detected 2 flat spectrum NLRGs. About 50% of the blazars associated to a gamma-ray object are BL Lacs, confirming that they are more likely detected among blazars gamma-emitters. We confirm the correlatio...

  18. Magnetic Fields in Quasar Cores II

    E-Print Network [OSTI]

    G. B. Taylor

    1999-11-22T23:59:59.000Z

    Multi-frequency polarimetry with the Very Long Baseline Array (VLBA) telescope has revealed absolute Faraday Rotation Measures (RMs) in excess of 1000 rad/m/m in the central regions of 7 out of 8 strong quasars studied (e.g., 3C 273, 3C 279, 3C 395). Beyond a projected distance of ~20 pc, however, the jets are found to have |RM| < 100 rad/m/m. Such sharp RM gradients cannot be produced by cluster or galactic-scale magnetic fields, but rather must be the result of magnetic fields organized over the central 1-100 pc. The RMs of the sources studied to date and the polarization properties of BL Lacs, quasars and galaxies are shown to be consistent so far with the predictions of unified schemes. The direct detection of high RMs in these quasar cores can explain the low fractional core polarizations usually observed in quasars at centimeter wavelengths as the result of irregularities in the Faraday screen on scales smaller than the telescope beam. Variability in the RM of the core is reported for 3C 279 between observations taken 1.5 years apart, indicating that the Faraday screen changes on that timescale, or that the projected superluminal motion of the inner jet components samples a new location in the screen with time. Either way, these changes in the Faraday screen may explain the dramatic variability in core polarization properties displayed by quasars.

  19. A Global 86GHz VLBI Survey of Compact Radio Sources

    E-Print Network [OSTI]

    Sang-Sung Lee; Andrei P. Lobanov; Thomas P. Krichbaum; Arno Witzel; J. Anton Zensus; Michael Bremer; Albert Greve; Michael Grewing

    2008-03-28T23:59:59.000Z

    We present results from a large 86GHz global VLBI survey of compact radio sources. The main goal of the survey is to increase by factors of 3--5 the total number of objects accessible for future 3-mm VLBI imaging. The survey observations reach the baseline sensitivity of 0.1Jy and image sensitivity of better than 10 mJy/beam. The total of 127 compact radio sources have been observed. The observations have yielded images for 109 sources, extending the database of the sources imaged at 86GHz with VLBI observation by a factor of 5, and only 6 sources have not been detected. The remaining 12 objects have been detected but could not be imaged due to insufficient closure phase information. Radio galaxies are less compact than quasars and BL Lacs on sub-milliarcsecond scale. Flux densities and sizes of core and jet components of all imaged sources have been estimated using Gaussian model fitting. From these measurements, brightness temperatures have been calculated, taking into account resolution limits of the data. The cores of 70% of the imaged sources are resolved. The core brightness temperatures of the sources peak at $\\sim 10^{11}$ K and only 1% have brightness temperatures higher than $10^{12}$ K. Cores of Intraday Variable (IDV) sources are smaller in angular size than non-IDV sources, and so yield higher brightness temperatures.

  20. Environmental research brief: Pollution prevention assessment for a manufacturer of automotive lighting equipment and accessories

    SciTech Connect (OSTI)

    Fleischman, M.; Couch, B.; Handmaker, A. [Tennessee Univ., Knoxville, TN (United States). Dept. of Engineering Science and Mechanics; Looby, G.P. [University City Science Center, Philadelphia, PA (United States)

    1995-08-01T23:59:59.000Z

    The US Environmental Protection Agency (EPA) has funded a Pilot project to assist small and medium-size manufacture who want to minimize their generation of waste but who lac the expertise to do so. In an effort to assist these manufacturers Waste Minimization Assessment Centers (WMACs) we established at selected universities and procedures were adapted from the EPA Waste Minimization Opportunity Assessment Manual. The WMAC team at the University of Tennessee performed an assessment at a plant that manufactures outboard motors for water craft. Three basic subunits received from other manufacturing plants undergo primarily painting and assembly operations in order to produce the final product. The team`s report, detailing findings and recommendations, indicated that paint overspray waste and spent clean-up solvent are generated in large quantities and that significant cost savings could be achieved by installing robotic paint application equipment. This Research Brief was developed by the principal investigators and EPA`s National Risk Management Research Laboratory, Cincinnati, OH, to announce key findings of an ongoing research project that is fully documented in a separate report of the same title available from University City Science Center.

  1. Modelling the molecular Zeeman effect in M-dwarfs: methods and first results

    E-Print Network [OSTI]

    Shulyak, D; Wende, S; Kochukhov, O; Piskunov, N; Seifahrt, A

    2010-01-01T23:59:59.000Z

    We present first quantitative results of the surface magnetic field measurements in selected M-dwarfs based on detailed spectra synthesis conducted simultaneously in atomic and molecular lines of the FeH Wing-Ford $F^4\\,\\Delta-X^4\\,\\Delta$ transitions. A modified version of the Molecular Zeeman Library (MZL) was used to compute Land\\'e g-factors for FeH lines in different Hund's cases. Magnetic spectra synthesis was performed with the Synmast code. We show that the implementation of different Hund's case for FeH states depending on their quantum numbers allows us to achieve a good fit to the majority of lines in a sunspot spectrum in an automatic regime. Strong magnetic fields are confirmed via the modelling of atomic and FeH lines for three M-dwarfs YZ~CMi, EV~Lac, and AD~Leo, but their mean intensities are found to be systematically lower than previously reported. A much weaker field ($1.7-2$~kG against $2.7$~kG) is required to fit FeH lines in the spectra of GJ~1224. Our method allows us to measure average...

  2. VERITAS Observations of the Unidentified Point Source HESS J1943+213

    E-Print Network [OSTI]

    ,

    2015-01-01T23:59:59.000Z

    The H.E.S.S. Galactic plane scan has revealed a large population of Galactic very high energy (VHE; E > 100 GeV) emitters. The majority of the galactic sources are extended and can typically be associated with pulsar wind nebulae (35%) and supernova remnants (21%), while some of the sources remain unidentified (31%). A much smaller fraction of point-like sources (5 in total, corresponding to 4%) are identified as gamma-ray binaries. Active galactic nuclei located behind the Galactic plane are also a potential source class. An active galaxy could be identified in the VHE regime by a point like extension, a high variability amplitude (up to a factor of 100) and a typically soft spectrum (due to absorption by the extra-galactic background light). Here we report on VERITAS observations of HESS J1943+213, an unidentified point source discovered to emit above 470 GeV during the extended H.E.S.S. Galactic plane scan. This source is thought to be a distant BL Lac object behind the Galactic plane and, though it exhibi...

  3. XMM-Newton Survey of Local O VII Absorption Lines in the Spectra of Active Galactic Nuclei

    E-Print Network [OSTI]

    Fang, Taotao; Bullock, James S; Ma, Renyi

    2015-01-01T23:59:59.000Z

    Highly ionized, z=0 metal absorption lines detected in the X-ray spectra of background active galactic nuclei (AGNs) provide an effective method to probe the hot ($T\\sim10^6$ K) gas and its metal content in and around the Milky Way. We present an all-sky survey of the $K_{\\alpha}$ transition of the local O VII absorption lines obtained by Voigt-profile fitting archival XMM-Newton observations. A total of 43 AGNs were selected, among which 12 are BL Lac-type AGNs, and the rest are Seyfert 1 galaxies. At above the $3\\sigma$ level the local O VII absorption lines were detected in 21 AGNs, among which 7 were newly discovered in this work. The sky covering fraction, defined as the ratio between the number of detections and the sample size, increases from at about 40% for all targets to 100% for the brightest targets, suggesting a uniform distribution of the O VII absorbers. We correlate the line equivalent width with the Galactic coordinates and do not find any strong correlations between these quantities. Some AG...

  4. OPTICAL SPECTRA OF CANDIDATE INTERNATIONAL CELESTIAL REFERENCE FRAME (ICRF) FLAT-SPECTRUM RADIO SOURCES

    SciTech Connect (OSTI)

    Titov, O.; Stanford, Laura M. [Geoscience Australia, P.O. Box 378, Canberra, ACT 2601 (Australia); Johnston, Helen M.; Hunstead, Richard W. [Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006 (Australia); Pursimo, T. [Nordic Optical Telescope, Nordic Optical Telescope Apartado 474E-38700 Santa Cruz de La Palma, Santa Cruz de Tenerife (Spain); Jauncey, David L. [CSIRO Astronomy and Space Science, ATNF and Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611 (Australia); Maslennikov, K. [Central Astronomical Observatory at Pulkovo, Pulkovskoye Shosse, 65/1, 196140, St. Petersburg (Russian Federation); Boldycheva, A., E-mail: oleg.titov@ga.gov.au [Ioffe Physical Technical Institute, 26 Polytekhnicheskaya, St. Petersburg, 194021 (Russian Federation)

    2013-07-01T23:59:59.000Z

    Continuing our program of spectroscopic observations of International Celestial Reference Frame (ICRF) sources, we present redshifts for 120 quasars and radio galaxies. Data were obtained with five telescopes: the 3.58 m European Southern Observatory New Technology Telescope, the two 8.2 m Gemini telescopes, the 2.5 m Nordic Optical Telescope (NOT), and the 6.0 m Big Azimuthal Telescope of the Special Astrophysical Observatory in Russia. The targets were selected from the International VLBI Service for Geodesy and Astrometry candidate International Celestial Reference Catalog which forms part of an observational very long baseline interferometry (VLBI) program to strengthen the celestial reference frame. We obtained spectra of the potential optical counterparts of more than 150 compact flat-spectrum radio sources, and measured redshifts of 120 emission-line objects, together with 19 BL Lac objects. These identifications add significantly to the precise radio-optical frame tie to be undertaken by Gaia, due to be launched in 2013, and to the existing data available for analyzing source proper motions over the celestial sphere. We show that the distribution of redshifts for ICRF sources is consistent with the much larger sample drawn from Faint Images of the Radio Sky at Twenty cm (FIRST) and Sloan Digital Sky Survey, implying that the ultra-compact VLBI sources are not distinguished from the overall radio-loud quasar population. In addition, we obtained NOT spectra for five radio sources from the FIRST and NRAO VLA Sky Survey catalogs, selected on the basis of their red colors, which yielded three quasars with z > 4.

  5. MULTIWAVELENGTH OBSERVATIONS OF THE AGN 1ES 0414+009 WITH VERITAS, FERMI-LAT, SWIFT-XRT, AND MDM

    SciTech Connect (OSTI)

    Aliu, E.; Errando, M. [Department of Physics and Astronomy, Barnard College, Columbia University, NY 10027 (United States); Archambault, S. [Physics Department, McGill University, Montreal, QC H3A 2T8 (Canada); Arlen, T. [Department of Physics and Astronomy, University of California, Los Angeles, CA 90095 (United States); Aune, T.; Bouvier, A. [Santa Cruz Institute for Particle Physics and Department of Physics, University of California, Santa Cruz, CA 95064 (United States); Beilicke, M.; Bugaev, V.; Dickherber, R. [Department of Physics, Washington University, St. Louis, MO 63130 (United States); Benbow, W. [Fred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, AZ 85645 (United States); Boettcher, M. [Astrophysical Institute, Department of Physics and Astronomy, Ohio University, Athens, OH 45701 (United States); Cannon, A.; Collins-Hughes, E. [School of Physics, University College Dublin, Belfield, Dublin 4 (Ireland); Cesarini, A.; Connolly, M. P. [School of Physics, National University of Ireland Galway, University Road, Galway (Ireland); Ciupik, L. [Astronomy Department, Adler Planetarium and Astronomy Museum, Chicago, IL 60605 (United States); Cui, W. [Department of Physics, Purdue University, West Lafayette, IN 47907 (United States); Dumm, J. [School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455 (United States); Falcone, A. [Department of Astronomy and Astrophysics, 525 Davey Lab, Pennsylvania State University, University Park, PA 16802 (United States); Federici, S., E-mail: aw.smith@utah.edu [DESY, Platanenallee 6, 15738 Zeuthen (Germany); and others

    2012-08-20T23:59:59.000Z

    We present observations of the BL Lac object 1ES 0414+009 in the >200 GeV gamma-ray band by the VERITAS array of Cherenkov telescopes. 1ES 0414+009 was observed by VERITAS between 2008 January and 2011 February, resulting in 56.2 hr of good quality pointed observations. These observations resulted in a detection of 822 events from the source corresponding to a statistical significance of 6.4 standard deviations (6.4{sigma}) above the background. The source flux, showing no evidence for variability, is measured as (5.2 {+-} 1.1{sub stat} {+-} 2.6{sub sys}) Multiplication-Sign 10{sup -12} photons cm{sup -2} s{sup -1} above 200 GeV, equivalent to approximately 2% of the Crab Nebula flux above this energy. The differential photon spectrum from 230 GeV to 850 GeV is well fit by a power law with a photon index of {Gamma} = 3.4 {+-} 0.5{sub stat} {+-} 0.3{sub sys} and a flux normalization of (1.6 {+-} 0.3{sub stat} {+-} 0.8{sub sys}) Multiplication-Sign 10{sup -11} photons cm{sup -2} s{sup -1} at 300 GeV. We also present multiwavelength results taken in the optical (MDM), x-ray (Swift-XRT), and GeV (Fermi-LAT) bands and use these results to construct a broadband spectral energy distribution (SED). Modeling of this SED indicates that homogenous one-zone leptonic scenarios are not adequate to describe emission from the system, with a lepto-hadronic model providing a better fit to the data.

  6. A Study of Wavelength Calibration of NEWSIPS High-Dispersion Spectra

    E-Print Network [OSTI]

    Myron A. Smith

    2001-04-03T23:59:59.000Z

    In this study we cross-correlate many IUE echellograms of a variety of stars to evaluate systematic error sources in the wavelength zeropoint of all three cameras. We first evaluated differences between the final archived ("NEWSIPS") and the originally processed ("IUESIPS") spectra. These show a clear time dependence in zeropoint for the SWP camera due to revisions in the IUESIPS wavelength scale. Small IUESIPS - NEWSIPS differences are also found for the LWR camera. We also examined wavelength zeropoint disparities between data obtained both through the small and large entrance apertures and for observations made by different target acquisition modes for faint and bright stars. We found that velocities resulting from these alternative observing modes are nil. For large-aperture observations the dominant error source is the target position placement in the aperture. We searched for spurious trends with time, and found only a suggestion of time trends for faint stars observed with the SWP camera. We also discovered 1-day, +/-3 km/s sinusoidsal patterns in intensive monitoring data which are ascribable to changes in telescope focus resulting from thermal drifts. In the second part of the paper, we measured mean zeropoint errors of NEWSIPS echellogram data against laboratory results by using the GHRS spectral atlas of the 10 Lac. We find that the derived apparent velocity difference for this star is -1 +/-3.5 km/s. Several less precise comparisons lead to similar results. The zeropoints of the NEWSIPS-processed LWP/LWR cameras are evaluated and are also found to be nearly zero (+/-5 km/s) relative to HST atlases of Arcturus and Procyon atlas. These results do not support result by Gonzalez-Riestra et al. that corrections should be introduced to the wavelength scales of various NEWSIPS high-dispersion data products.

  7. Testing the inverse-Compton catastrophe scenario in the intra-day variable blazar S5 0716+71: II. A search for intra-day variability at millimetre wavelengths with the IRAM 30 m telescope

    E-Print Network [OSTI]

    I. Agudo; T. P. Krichbaum; H. Ungerechts; A. Kraus; A. Witzel; E. Angelakis; L. Fuhrmann; U. Bach; S. Britzen; J. A. Zensus; S. J. Wagner; L. Ostorero; E. Ferrero; J. Gracia; M. Grewing

    2006-06-02T23:59:59.000Z

    We report on a densely time sampled polarimetric flux density monitoring of the BL Lac object S5 0716+71 at 86 GHz and 229 GHz with the IRAM 30 m telescope within a coordinated broad spectral band campaign, centred around an INTEGRAL observation during November 10 to 16, 2003. Our aim was to search for signatures of inverse-Compton "catastrophes". At 86 GHz, making use of a new calibration strategy, we reach a relative rms accuracy of the flux density measurements of 1.2%. At this frequency, S5 0716+71 showed no intra-day variability, but showed remarkable inter-day variability with a flux density increase of 34% during the first four observing days, which can not be explained by source extrinsic causes. The 86 GHz linear polarization fraction of S5 0716+71 was unusually large 15.0+-1.8%. Inter-day variability in linear polarization at 86 GHz, with significance level >~95%; sigma_P/=15% and sigma_chi=6 deg., was also observed. From the emission variations at the synchrotron turnover frequency (~86 GHz) we compute an apparent brightness temperature T_B,app>1.4x10^14K at a redshift of 0.3, which exceeds by two orders of magnitude the inverse-Compton limit. A relativistic correction for T_B,app with a Doppler factor delta > 7.8 brings the observed brightness temperature down to the inverse Compton limit. A more accurate lower limit of delta > 14.0, is obtained from the comparison of the 86 GHz synchrotron flux density and the upper limits for the synchrotron self-Compton flux density obtained from the INTEGRAL observations. The relativistic beaming of the emission by this high Doppler factor explains the non-detection of "catastrophic" inverse-Compton avalanches by INTEGRAL.

  8. Testing the inverse-Compton catastrophe scenario in the intra-day variable blazar S5 0716+71, III. Rapid and correlated flux density variability from radio to sub-mm bands

    E-Print Network [OSTI]

    L. Fuhrmann; T. P. Krichbaum; A. Witzel; A. Kraus; S. Britzen; S. Bernhart; C. M. V. Impellizzeri; I. Agudo; J. Klare; B. W. Sohn; E. Angelakis; U. Bach; K. 'E. Gab'anyi; E. K"ording; A. Pagels; J. A. Zensus; S. J. Wagner; L. Ostorero; H. Ungerechts; M. Grewing; M. Tornikoski; A. J. Apponi; B. Vila-Vilar'o; L. M. Ziurys; R. G. Strom

    2008-09-12T23:59:59.000Z

    The BL Lac object S5 0716+71 was observed in a global multi-frequency campaign to search for rapid and correlated flux density variability and signatures of an inverse-Compton (IC) catastrophe during the states of extreme apparent brightness temperatures. The observing campaign involved simultaneous monitoring at radio to IR/optical wavelengths centered around a 500-ks INTEGRAL pointing (November 10-17, 2003). We present the combined analysis and results of the cm- to sub-mm observations including a detailed study of the inter- to intra-day variability and spectral characteristics of 0716+714. We further constrain the variability brightness temperatures (T_B) and Doppler factors (delta) comparing the radio-bands with the hard X-ray emission (3-200 keV). 0716+714 was in an exceptionally high state (outburst) and different (slower) phase of short-term variability. The flux density variability in the cm- to mm-bands is dominated by a correlated, ~4 day time scale amplitude increase of up to ~35% systematically more pronounced towards shorter wavelengths. This contradicts expectations from standard interstellar scintillation (ISS) and suggests a source-intrinsic origin of the variability. The derived lower limits to T_B exceed the 10^12 K IC-limit by up to 3-4 orders of magnitude. Assuming relativistic boosting, we obtain robust and self-consistent lower limits of delta >= 5-33, in good agreement with delta_VLBI obtained from VLBI studies and the IC-Doppler factors delta_IC > 14-16 obtained from the INTEGRAL data. Since a strong contribution from ISS can be excluded and a simultaneous IC catastrophe was not observed, we conclude that relativistic Doppler boosting naturally explains the apparent violation of the theoretical limits within standard synchrotron-self-Compton (SSC) jet models of AGN.

  9. Rapid and correlated variability of blazar S5 0716+71 from radio- to sub-mm bands

    E-Print Network [OSTI]

    L. Fuhrmann; T. P. Krichbaum; A. Witzel; I. Agudo; S. Britzen; S. Bernhart; V. Impellizzeri; A. Kraus; E. Angelakis; U. Bach; K. Gabnyi; J. A. Zensus

    2006-11-13T23:59:59.000Z

    The BL Lac object S5 0716+71 was target of a coordinated and global multi-frequency campaign to search for rapid and correlated variability and signatures of the inverse-Compton catastrophe. Here we present first results obtained from a combined analysis of the cm- to sub-mm observations over a period of seven days aiming at a detailed study of the intra- to inter-day variability characteristics and to obtain constraints on the variability brightness temperatures and Doppler factors comparing the radio data with the high energy emission recorded by INTEGRAL. A more detailed description of the whole cm- to sub-mm observations and our analysis/results will be presented in a forthcoming paper. Our analysis reveals the source to be in a particular short-term variability phase when compared to the past with a correlated >~4 day time scale amplitude increase of up to 35%, which is systematically more pronounced towards higher frequencies. The obtained frequency dependent variability amplitudes and time lags contradict expectations from interstellar scintillation and strongly suggest a source intrinsic origin of this inter-day variability. A 7-day spectral evolution study indicate time-variable synchrotron self-absorption and expansion of the emission region, consistent with standard models. Assuming relativistic boosting, our different estimates of the Doppler factor yield robust lower limits of D_var,IC > 5-22 using the inverse-Compton limit and D_var,eq > 8-33 using the equipartition argument. Although high, these values are in good agreement with Doppler factors obtained from recent VLBI studies and from the inverse-Compton Doppler factors D_IC > 14-16 derived with the X-ray emission seen by INTEGRAL at 3-200 keV.

  10. A Parallel Coiled-Coil Tetramer with Offset Helices

    SciTech Connect (OSTI)

    Liu,J.; Deng, Y.; Zheng, Q.; Cheng, C.; Kallenbach, N.; Lu, M.

    2006-01-01T23:59:59.000Z

    Specific helix-helix interactions are fundamental in assembling the native state of proteins and in protein-protein interfaces. Coiled coils afford a unique model system for elucidating principles of molecular recognition between {alpha} helices. The coiled-coil fold is specified by a characteristic seven amino acid repeat containing hydrophobic residues at the first (a) and fourth (d) positions. Nonpolar side chains spaced three and four residues apart are referred to as the 3-4 hydrophobic repeat. The presence of apolar amino acids at the e or g positions (corresponding to a 3-3-1 hydrophobic repeat) can provide new possibilities for close-packing of {alpha}-helices that includes examples such as the lac repressor tetramerization domain. Here we demonstrate that an unprecedented coiled-coil interface results from replacement of three charged residues at the e positions in the dimeric GCN4 leucine zipper by nonpolar valine side chains. Equilibrium circular dichroism and analytical ultracentrifugation studies indicate that the valine-containing mutant forms a discrete {alpha}-helical tetramer with a significantly higher stability than the parent leucine-zipper molecule. The 1.35 {angstrom} resolution crystal structure of the tetramer reveals a parallel four-stranded coiled coil with a three-residue interhelical offset. The local packing geometry of the three hydrophobic positions in the tetramer conformation is completely different from that seen in classical tetrameric structures yet bears resemblance to that in three-stranded coiled coils. These studies demonstrate that distinct van der Waals interactions beyond the a and d side chains can generate a diverse set of helix-helix interfaces and three-dimensional supercoil structures.

  11. Facilitated diffusion framework for transcription factor search with conformational changes

    E-Print Network [OSTI]

    Jrme Cartailler; Jrgen Reingruber

    2015-07-09T23:59:59.000Z

    Cellular responses often require the fast activation or repression of specific genes, which depends on Transcription Factors (TFs) that have to quickly find the promoters of these genes within a large genome. Transcription Factors (TFs) search for their DNA promoter target by alternating between bulk diffusion and sliding along the DNA, a mechanism known as facilitated diffusion. We study a facilitated diffusion framework with switching between three search modes: a bulk mode and two sliding modes triggered by conformational changes between two protein conformations. In one conformation (search mode) the TF interacts unspecifically with the DNA backbone resulting in fast sliding. In the other conformation (recognition mode) it interacts specifically and strongly with DNA base pairs leading to slow displacement. From the bulk, a TF associates with the DNA at a random position that is correlated with the previous dissociation point, which implicitly is a function of the DNA structure. The target affinity depends on the conformation. We derive exact expressions for the mean first passage time (MFPT) to bind to the promoter and the conditional probability to bind before detaching when arriving at the promoter site. We systematically explore the parameter space and compare various search scenarios. We compare our results with experimental data for the dimeric Lac repressor search in E.Coli bacteria. We find that a coiled DNA conformation is absolutely necessary for a fast MFPT. With frequent spontaneous conformational changes, a fast search time is achieved even when a TF becomes immobilized in the recognition state due to the specific bindings. We find a MFPT compatible with experimental data in presence of a specific TF-DNA interaction energy that has a Gaussian distribution with a large variance.

  12. Water Supply at Los Alamos 1998-2001

    SciTech Connect (OSTI)

    Richard J. Koch; David B. Rogers

    2003-03-01T23:59:59.000Z

    For the period 1998 through 2001, the total water used at Los Alamos from all sources ranged from 1325 million gallons (Mg) in 1999 to 1515 Mg in 2000. Groundwater production ranged from 1323 Mg in 1999 to 1506 Mg in 2000 from the Guaje, Pajarito, and Otowi fields. Nonpotable surface water used from Los Alamos reservoir ranged from zero gallons in 2001 to 9.3 Mg in 2000. For years 1998 through 2001, over 99% of all water used at Los Alamos was groundwater. Water use by Los Alamos National Laboratory (LANL) between 1998 and 2001 ranged from 379 Mg in 2000 to 461 Mg in 1998. The LANL water use in 2001 was 393 Mg or 27% of the total water use at Los Alamos. Water use by Los Alamos County ranged from 872 Mg in 1999 to 1137 Mg in 2000, and averaged 1006 Mg/yr. Four new replacement wells in the Guaje field (G-2A, G-3A, G-4A, and G-5A) were drilled in 1998 and began production in 1999; with existing well G-1A, the Guaje field currently has five producing wells. Five of the old Guaje wells (G-1, G-2, G-4, G-5, and G-6) were plugged and abandoned in 1999, and one well (G-3) was abandoned but remains as an observation well for the Guaje field. The long-term water level observations in production and observation (test) wells at Los Alamos are consistent with the formation of a cone of depression in response to water production. The water level decline is gradual and at most has been about 0.7 to 2 ft per year for production wells and from 0.4 to 0.9 ft/yr for observation (test) wells. The largest water level declines have been in the Guaje field where nonpumping water levels were about 91 ft lower in 2001 than in 1951. The initial water levels of the Guaje replacement wells were 32 to 57 ft lower than the initial water levels of adjacent original Guaje wells. When production wells are taken off-line for pump replacement or repair, water levels have returned to within about 25 ft of initial static levels within 6 to 12 months. Thus, the water-level trends suggest no adverse impacts by production on long-term water supply sustainability at Los Alamos. This report summarizes production data and aquifer conditions for water production and monitor wells in the Los Alamos, New Mexico, and Los Alamos National Laboratory (LANL) area (Figure 1). Water production wells are grouped within the Guaje, Pajarito, and Otowi fields, the locations of which are shown on Figure 1. Wells from these fields supply all the potable water used for municipal and most industrial purposes in Los Alamos County (LAC), at LANL, and at Bandelier National Monument. This report has three primary objectives: (1) Provide a continuing historical record of metered well production and overall water usage; (2) Provide data to the Department of Energy (DOE) and LANL management, and Los Alamos County planners for operation of the water supply system and for long-range water resource planning; and (3) Provide water-level data from regional aquifer production wells, test wells, and monitoring wells.