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


1

Investigating Extreme Ultraviolet Lithography Mask Defects  

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

Investigating Extreme Investigating Extreme Ultraviolet Lithography Mask Defects Investigating Extreme Ultraviolet Lithography Mask Defects Print Wednesday, 28 July 2010 00:00 Since the 1970s, the semiconductor industry has strived to shrink the cost and size of circuit patterns printed onto computer chips in accordance with Moore's law, doubling the number of transistors on a computer's central processing unit (CPU) every two years. The introduction of extreme ultraviolet (EUV) lithography, printing chips using 13-nm-wavelength light, opens the way to future generations of smaller, faster, and cheaper semiconductors. EUV lithography relies on specialized lenses made of curved mirrors with reflective coatings called multilayers to print patterns with high resolution. One special flat mirror called a mask is particularly sensitive to even the smallest imperfections. To better detect and characterize mask defects, scientists at Berkeley Lab worked with SEMATECH, an international semiconductor industry consortium, to create a unique Fresnel zone-plate microscope on Advanced Light Source Beamline 11.3.2 called the SEMATECH Berkeley Actinic Inspection Tool (AIT).

2

Investigating Extreme Ultraviolet Lithography Mask Defects  

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

Investigating Extreme Ultraviolet Lithography Mask Defects Print Investigating Extreme Ultraviolet Lithography Mask Defects Print Since the 1970s, the semiconductor industry has strived to shrink the cost and size of circuit patterns printed onto computer chips in accordance with Moore's law, doubling the number of transistors on a computer's central processing unit (CPU) every two years. The introduction of extreme ultraviolet (EUV) lithography, printing chips using 13-nm-wavelength light, opens the way to future generations of smaller, faster, and cheaper semiconductors. EUV lithography relies on specialized lenses made of curved mirrors with reflective coatings called multilayers to print patterns with high resolution. One special flat mirror called a mask is particularly sensitive to even the smallest imperfections. To better detect and characterize mask defects, scientists at Berkeley Lab worked with SEMATECH, an international semiconductor industry consortium, to create a unique Fresnel zone-plate microscope on Advanced Light Source Beamline 11.3.2 called the SEMATECH Berkeley Actinic Inspection Tool (AIT).

3

Investigating Extreme Ultraviolet Lithography Mask Defects  

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

Investigating Extreme Ultraviolet Lithography Mask Defects Print Investigating Extreme Ultraviolet Lithography Mask Defects Print Since the 1970s, the semiconductor industry has strived to shrink the cost and size of circuit patterns printed onto computer chips in accordance with Moore's law, doubling the number of transistors on a computer's central processing unit (CPU) every two years. The introduction of extreme ultraviolet (EUV) lithography, printing chips using 13-nm-wavelength light, opens the way to future generations of smaller, faster, and cheaper semiconductors. EUV lithography relies on specialized lenses made of curved mirrors with reflective coatings called multilayers to print patterns with high resolution. One special flat mirror called a mask is particularly sensitive to even the smallest imperfections. To better detect and characterize mask defects, scientists at Berkeley Lab worked with SEMATECH, an international semiconductor industry consortium, to create a unique Fresnel zone-plate microscope on Advanced Light Source Beamline 11.3.2 called the SEMATECH Berkeley Actinic Inspection Tool (AIT).

4

Investigating Extreme Ultraviolet Lithography Mask Defects  

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

types of mask defects recorded in several state-of-the-art tools: the AIT, a scanning electron microscope (SEM), and a commercial deep ultraviolet (DUV) mask inspection tool....

5

Extreme Ultraviolet Lithography (EUVL) Portfolio  

Abstract Fees; Passivating Overcoat Bilayer for Multilayer Reflective Coatings for Extreme Ultraviolet (EUV) Lithography. 5,958,605. A passivating overcoat bilayer is ...

6

Extreme Ultraviolet Variability Experiment (EVE) Multiple EUV ...  

Science Conference Proceedings (OSTI)

and the Extreme ultraviolet SpectroPhotometer (ESP). The radiometric ... the calibration of the ESP instrument is addressed by Didkovsky et al. (Solar Phys.

7

Reflective masks for extreme ultraviolet lithography  

SciTech Connect

Extreme ultraviolet lithographic masks are made by patterning multilayer reflective coatings with high normal incidence reflectivity. Masks can be patterned by depositing a patterned absorber layer above the coating or by etching the pattern directly into the coating itself. Electromagnetic simulations showed that absorber-overlayer masks have superior imaging characteristics over etched masks (less sensitive to incident angles and pattern profiles). In an EUVL absorber overlayer mask, defects can occur in the mask substrate, reflective coating, and absorber pattern. Electromagnetic simulations showed that substrate defects cause the most severe image degradation. A printability study of substrate defects for absorber overlayer masks showed that printability of 25 nm high substrate defects are comparable to defects in optical lithography. Simulations also indicated that the manner in which the defects are covered by multilayer reflective coatings can affect printability. Coverage profiles that result in large lateral spreading of defect geometries amplify the printability of the defects by increasing their effective sizes. Coverage profiles of Mo/Si coatings deposited above defects were studied by atomic force microscopy and TEM. Results showed that lateral spread of defect geometry is proportional to height. Undercut at defect also increases the lateral spread. Reductions in defect heights were observed for 0.15 {mu}m wide defect lines. A long-term study of Mo/Si coating reflectivity revealed that Mo/Si coatings with Mo as the top layer suffer significant reductions in reflectivity over time due to oxidation.

Nguyen, Khanh Bao

1994-05-01T23:59:59.000Z

8

Method for generating extreme ultraviolet with mather-type plasma accelerators for use in Extreme Ultraviolet Lithography  

DOE Patents (OSTI)

A device and method for generating extremely short-wave ultraviolet electromagnetic wave uses two intersecting plasma beams generated by two plasma accelerators. The intersection of the two plasma beams emits electromagnetic radiation and in particular radiation in the extreme ultraviolet wavelength. In the preferred orientation two axially aligned counter streaming plasmas collide to produce an intense source of electromagnetic radiation at the 13.5 nm wavelength. The Mather type plasma accelerators can utilize tin, or lithium covered electrodes. Tin, lithium or xenon can be used as the photon emitting gas source.

Hassanein, Ahmed (Bolingbrook, IL); Konkashbaev, Isak (Bolingbrook, IL)

2006-10-03T23:59:59.000Z

9

Condenser for ring-field deep ultraviolet and extreme ultraviolet lithography  

DOE Patents (OSTI)

A condenser for use with a ring-field deep ultraviolet or extreme ultraviolet lithography system. A condenser includes a ripple-plate mirror which is illuminated by a collimated or converging beam at grazing incidence. The ripple plate comprises a flat or curved plate mirror into which is formed a series of channels along an axis of the mirror to produce a series of concave surfaces in an undulating pattern. Light incident along the channels of the mirror is reflected onto a series of cones. The distribution of slopes on the ripple plate leads to a distribution of angles of reflection of the incident beam. This distribution has the form of an arc, with the extremes of the arc given by the greatest slope in the ripple plate. An imaging mirror focuses this distribution to a ring-field arc at the mask plane.

Chapman, Henry N. (Livermore, CA); Nugent, Keith A. (North Fitzroy, AU)

2002-01-01T23:59:59.000Z

10

Condenser for ring-field deep-ultraviolet and extreme-ultraviolet lithography  

DOE Patents (OSTI)

A condenser for use with a ring-field deep ultraviolet or extreme ultraviolet lithography system. A condenser includes a ripple-plate mirror which is illuminated by a collimated beam at grazing incidence. The ripple plate comprises a plate mirror into which is formed a series of channels along an axis of the mirror to produce a series of concave surfaces in an undulating pattern. Light incident along the channels of the mirror is reflected onto a series of cones. The distribution of slopes on the ripple plate leads to a distribution of angles of reflection of the incident beam. This distribution has the form of an arc, with the extremes of the arc given by the greatest slope in the ripple plate. An imaging mirror focuses this distribution to a ring-field arc at the mask plane.

Chapman, Henry N. (Livermore, CA); Nugent, Keith A. (North Fitzroy, AU)

2001-01-01T23:59:59.000Z

11

Investigating Extreme Ultraviolet Lithography Mask Defects  

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

La Fontaine, A. Tchikoulaeva, and C. Holfeld, "Actinic imaging of native and programmed defects on a full-field mask," Proc. SPIE 7636, 76361A (2010). ALS Science Highlight 213...

12

Investigating Extreme Ultraviolet Lithography Mask Defects  

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

Tchikoulaeva, and C. Holfeld, "Actinic imaging of native and programmed defects on a full-field mask," Proc. SPIE 7636, 76361A (2010). ALS Science Highlight 213 ALSNews Vol. 311...

13

THE EXTREME-ULTRAVIOLET EMISSION FROM SUN-GRAZING COMETS  

SciTech Connect

The Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory has observed two Sun-grazing comets as they passed through the solar atmosphere. Both passages resulted in a measurable enhancement of extreme-ultraviolet (EUV) radiance in several of the AIA bandpasses. We explain this EUV emission by considering the evolution of the cometary atmosphere as it interacts with the ambient solar atmosphere. Molecules in the comet rapidly sublimate as it approaches the Sun. They are then photodissociated by the solar radiation field to create atomic species. Subsequent ionization of these atoms produces a higher abundance of ions than normally present in the corona and results in EUV emission in the wavelength ranges of the AIA telescope passbands.

Bryans, P. [ADNET Systems Inc., NASA Goddard Space Flight Center, Code 671, Greenbelt, MD 20771 (United States); Pesnell, W. D. [NASA Goddard Space Flight Center, Code 671, Greenbelt, MD 20771 (United States)

2012-11-20T23:59:59.000Z

14

NEW SOLAR EXTREME-ULTRAVIOLET IRRADIANCE OBSERVATIONS DURING FLARES  

Science Conference Proceedings (OSTI)

New solar extreme-ultraviolet (EUV) irradiance observations from the NASA Solar Dynamics Observatory (SDO) EUV Variability Experiment provide full coverage in the EUV range from 0.1 to 106 nm and continuously at a cadence of 10 s for spectra at 0.1 nm resolution and even faster, 0.25 s, for six EUV bands. These observations can be decomposed into four distinct characteristics during flares. First, the emissions that dominate during the flare's impulsive phase are the transition region emissions, such as the He II 30.4 nm. Second, the hot coronal emissions above 5 MK dominate during the gradual phase and are highly correlated with the GOES X-ray. A third flare characteristic in the EUV is coronal dimming, seen best in the cool corona, such as the Fe IX 17.1 nm. As the post-flare loops reconnect and cool, many of the EUV coronal emissions peak a few minutes after the GOES X-ray peak. One interesting variation of the post-eruptive loop reconnection is that warm coronal emissions (e.g., Fe XVI 33.5 nm) sometimes exhibit a second large peak separated from the primary flare event by many minutes to hours, with EUV emission originating not from the original flare site and its immediate vicinity, but rather from a volume of higher loops. We refer to this second peak as the EUV late phase. The characterization of many flares during the SDO mission is provided, including quantification of the spectral irradiance from the EUV late phase that cannot be inferred from GOES X-ray diagnostics.

Woods, Thomas N.; Hock, Rachel; Eparvier, Frank; Jones, Andrew R. [Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80303 (United States); Chamberlin, Phillip C.; Klimchuk, James A. [NASA Goddard Space Flight Center, Solar Physics Laboratory, Greenbelt, MD 20771 (United States); Didkovsky, Leonid; Judge, Darrell [Space Sciences Center, University of Southern California, Los Angeles, CA 90089 (United States); Mariska, John; Warren, Harry [Space Science Division, Naval Research Laboratory, Washington, DC 20375 (United States); Schrijver, Carolus J. [Lockheed Martin Solar and Astrophysics Laboratory, Palo Alto, CA 94304 (United States); Webb, David F. [Institute for Scientific Research, Boston College, Chestnut Hill, MA 02467 (United States); Bailey, Scott [Electrical and Computer Engineering Department, Virginia Tech, Blacksburg, VA 24061 (United States); Tobiska, W. Kent, E-mail: tom.woods@lasp.colorado.edu [Space Environment Technologies, Pacific Palisades, CA 90272 (United States)

2011-10-01T23:59:59.000Z

15

Carbon contamination and oxidation of Au surfaces under extreme ultraviolet radiation: An x-ray photoelectron spectroscopy study  

E-Print Network (OSTI)

Carbon contamination and oxidation of Au surfaces under extreme ultraviolet radiation: An x 2012) Extreme ultraviolet (EUV) radiation-induced carbon contamination and oxidation of Au surfaces modification during EUV exposure. XPS analysis showed that total carbon contamination (C 1s peak

Harilal, S. S.

16

Low-cost method for producing extreme ultraviolet lithography optics  

DOE Patents (OSTI)

Spherical and non-spherical optical elements produced by standard optical figuring and polishing techniques are extremely expensive. Such surfaces can be cheaply produced by diamond turning; however, the roughness in the diamond turned surface prevent their use for EUV lithography. These ripples are smoothed with a coating of polyimide before applying a 60 period Mo/Si multilayer to reflect a wavelength of 134 .ANG. and have obtained peak reflectivities close to 63%. The savings in cost are about a factor of 100.

Folta, James A. (Livermore, CA); Montcalm, Claude (Fort Collins, CO); Taylor, John S. (Livermore, CA); Spiller, Eberhard A. (Mt. Kisco, NY)

2003-11-21T23:59:59.000Z

17

Method for plasma formation for extreme ultraviolet lithography-theta pinch  

SciTech Connect

A device and method for generating extremely short-wave ultraviolet electromagnetic wave, utilizing a theta pinch plasma generator to produce electromagnetic radiation in the range of 10 to 20 nm. The device comprises an axially aligned open-ended pinch chamber defining a plasma zone adapted to contain a plasma generating gas within the plasma zone; a means for generating a magnetic field radially outward of the open-ended pinch chamber to produce a discharge plasma from the plasma generating gas, thereby producing a electromagnetic wave in the extreme ultraviolet range; a collecting means in optical communication with the pinch chamber to collect the electromagnetic radiation; and focusing means in optical communication with the collecting means to concentrate the electromagnetic radiation.

Hassanein, Ahmed (Naperville, IL); Konkashbaev, Isak (Bolingbrook, IL); Rice, Bryan (Hillsboro, OR)

2007-02-20T23:59:59.000Z

18

Calibration of a microchannel plate based extreme ultraviolet grazing incident spectrometer at the Advanced Light Source  

SciTech Connect

We present the design and calibration of a microchannel plate based extreme ultraviolet spectrometer. Calibration was performed at the Advance Light Source (ALS) at the Lawrence Berkeley National Laboratory (LBNL). This spectrometer will be used to record the single shot spectrum of radiation emitted by the tapered hybrid undulator (THUNDER) undulator installed at the LOASIS GeV-class laser-plasma-accelerator. The spectrometer uses an aberration-corrected concave grating with 1200 lines/mm covering 11-62 nm and a microchannel plate detector with a CsI coated photocathode for increased quantum efficiency in the extreme ultraviolet. A touch screen interface controls the grating angle, aperture size, and placement of the detector in vacuum, allowing for high-resolution measurements over the entire spectral range.

Bakeman, M. S. [Department of Physics, University of Nevada Reno, Reno, Nevada 89557 (United States); Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Tilborg, J. van; Sokollik, T.; Baum, D.; Ybarrolaza, N.; Duarte, R.; Toth, C.; Leemans, W. P. [Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)

2010-10-15T23:59:59.000Z

19

Extreme Ultraviolet Imaging of Electron Heated Targets in Petawatt Laser Experiments  

Science Conference Proceedings (OSTI)

The study of the transport of electrons, and the flow of energy into a solid target or dense plasma, is instrumental in the development of fast ignition inertial confinement fusion. An extreme ultraviolet (XUV) imaging diagnostic at 256 eV and 68 eV provides information about heating and energy deposition within petawatt laser-irradiated targets. XUV images of several irradiated solid targets are presented.

Ma, T; MacPhee, A; Key, M; Akli, K; Mackinnon, A; Chen, C; Barbee, T; Freeman, R; King, J; Link, A; Offermann, D; Ovchinnikov, V; Patel, P; Stephens, R; VanWoerkom, L; Zhang, B; Beg, F

2007-11-29T23:59:59.000Z

20

Absolute intensity calibration of the Wendelstein 7-X high efficiency extreme ultraviolet overview spectrometer system  

Science Conference Proceedings (OSTI)

The new high effiency extreme ultraviolet overview spectrometer (HEXOS) system for the stellarator Wendelstein 7-X is now mounted for testing and adjustment at the tokamak experiment for technology oriented research (TEXTOR). One part of the testing phase was the intensity calibration of the two double spectrometers which in total cover a spectral range from 2.5 to 160.0 nm with overlap. This work presents the current intensity calibration curves for HEXOS and describes the method of calibration. The calibration was implemented with calibrated lines of a hollow cathode light source and the branching ratio technique. The hollow cathode light source provides calibrated lines from 16 up to 147 nm. We could extend the calibrated region in the spectrometers down to 2.8 nm by using the branching line pairs emitted by an uncalibrated pinch extreme ultraviolet light source as well as emission lines from boron and carbon in TEXTOR plasmas. In total HEXOS is calibrated from 2.8 up to 147 nm, which covers most of the observable wavelength region. The approximate density of carbon in the range of the minor radius from 18 to 35 cm in a TEXTOR plasma determined by simulating calibrated vacuum ultraviolet emission lines with a transport code was 5.5x10{sup 17} m{sup -3} which corresponds to a local carbon concentration of 2%.

Greiche, Albert; Biel, Wolfgang; Marchuk, Oleksandr [Institut fuer Energieforschung-Plasmaphysik, Forschungszentrum Juelich GmbH, EURATOM Association, Trilateral Euregio Cluster, D-52425 Juelich (Germany); Burhenn, Rainer [Max-Planck-Institut fuer Plasmaphysik, EURATOM Association, D-17491 Greifswald (Germany)

2008-09-15T23:59:59.000Z

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


21

OBSERVATIONS OF FIVE-MINUTE SOLAR OSCILLATIONS IN THE CORONA USING THE EXTREME ULTRAVIOLET SPECTROPHOTOMETER (ESP) ON BOARD THE SOLAR DYNAMICS OBSERVATORY EXTREME ULTRAVIOLET VARIABILITY EXPERIMENT (SDO/EVE)  

Science Conference Proceedings (OSTI)

We report on the detection of oscillations in the corona in the frequency range corresponding to five-minute acoustic modes of the Sun. The oscillations have been observed using soft X-ray measurements from the Extreme Ultraviolet Spectrophotometer (ESP) of the Extreme Ultraviolet Variability Experiment on board the Solar Dynamics Observatory. The ESP zeroth-order channel observes the Sun as a star without spatial resolution in the wavelength range of 0.1-7.0 nm (the energy range is 0.18-12.4 keV). The amplitude spectrum of the oscillations calculated from six-day time series shows a significant increase in the frequency range of 2-4 mHz. We interpret this increase as a response of the corona to solar acoustic (p) modes and attempt to identify p-mode frequencies among the strongest peaks. Due to strong variability of the amplitudes and frequencies of the five-minute oscillations in the corona, we study how the spectrum from two adjacent six-day time series combined together affects the number of peaks associated with the p-mode frequencies and their amplitudes. This study shows that five-minute oscillations of the Sun can be observed in the corona in variations of the soft X-ray emission. Further investigations of these oscillations may improve our understanding of the interaction of the oscillation modes with the solar atmosphere, and the interior-corona coupling, in general.

Didkovsky, L.; Judge, D.; Wieman, S. [Space Sciences Center, University of Southern California, Los Angeles, CA 90089 (United States); Kosovichev, A. G. [W. W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA 94305 (United States); Woods, T., E-mail: leonid@usc.edu [Laboratory for Atmospheric and Space Physics, University of Colorado at Boulder, Boulder, CO 80301 (United States)

2011-09-01T23:59:59.000Z

22

Enhancing extreme ultraviolet photons emission in laser produced plasmas for advanced lithography  

SciTech Connect

Current challenges in the development of efficient laser produced plasma sources for the next generation extreme ultraviolet lithography (EUVL) are increasing EUV power and maximizing lifetime and therefore, reducing cost of devices. Mass-limited targets such as small tin droplets are considered among the best choices for cleaner operation of the optical system because of lower mass of atomic debris produced by the laser beam. The small diameter of droplets, however, decreases the conversion efficiency (CE) of EUV photons emission, especially in the case of CO{sub 2} laser, where laser wavelength has high reflectivity from the tin surface. We investigated ways of improving CE in mass-limited targets. We considered in our modeling various possible target phases and lasers configurations: from solid/liquid droplets subjected to laser beam energy with different intensities and laser wavelength to dual-beam lasers, i.e., a pre-pulse followed by a main pulse with adjusted delay time in between. We studied the dependence of vapor expansion rate, which can be produced as a result of droplet heating by pre-pulse laser energy, on target configuration, size, and laser beam parameters. As a consequence, we studied the influence of these conditions and parameters on the CE and debris mass accumulation. For better understanding and more accurate modeling of all physical processes occurred during various phases of laser beam/target interactions, plasma plume formation and evolution, EUV photons emission and collection, we have implemented in our heights package state-of-the art models and methods, verified, and benchmarked against laboratory experiments in our CMUXE center as well as various worldwide experimental results.

Sizyuk, T.; Hassanein, A. [Center for Materials under Extreme Environment, School of Nuclear Engineering, Purdue University, West Lafayette, Indiana 47907 (United States)

2012-08-15T23:59:59.000Z

23

Electron heated target temperature measurements in petawatt laser experiments based on extreme ultraviolet imaging and spectroscopy  

Science Conference Proceedings (OSTI)

Three independent methods (extreme ultraviolet spectroscopy, imaging at 68 and 256 eV) have been used to measure planar target rear surface plasma temperature due to heating by hot electrons. The hot electrons are produced by ultraintense laser-plasma interactions using the 150 J, 0.5 ps Titan laser. Soft x-ray spectroscopy in the 50-400 eV region and imaging at the 68 and 256 eV photon energies give a planar deuterated carbon target rear surface pre-expansion temperature in the 125-150 eV range, with the rear plasma plume averaging a temperature approximately 74 eV.

Ma, T. [Department of Mechanical and Aerospace Engineering, University of California-San Diego, 9500 Gilman Drive, La Jolla, California 92093-0417 (United States); Lawrence Livermore National Laboratory, 7000 East Ave., Livermore, California 94550 (United States); Beg, F. N. [Department of Mechanical and Aerospace Engineering, University of California-San Diego, 9500 Gilman Drive, La Jolla, California 92093-0417 (United States); MacPhee, A. G.; Chung, H.-K.; Key, M. H.; Mackinnon, A. J.; Patel, P. K.; Hatchett, S. [Lawrence Livermore National Laboratory, 7000 East Ave., Livermore, California 94550 (United States); Akli, K. U.; Stephens, R. B. [General Atomics, San Diego, California 92186 (United States); Chen, C. D. [Plasma Science Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); Freeman, R. R.; Link, A.; Offermann, D. T.; Ovchinnikov, V.; Van Woerkom, L. D. [College of Mathematical and Physical Sciences, The Ohio State University, 425 Stillman Hall, Columbus, Ohio 43210-1123 (United States)

2008-10-15T23:59:59.000Z

24

Effect of high-energy neutral particles on extreme ultraviolet spectroscopy in large helical device  

Science Conference Proceedings (OSTI)

Spectra measured by an extreme ultraviolet (EUV) spectrometer frequently suffer large spike noise when Large Helical Device is operated in low-density range ({order to examine the effect of NBI, a carbon filter with thickness of 150 nm was installed in the EUV spectrometer. As a result, the spike noise was reduced by an order of magnitude. It is experimentally verified that the spike noise is caused by escaping high-energy neutral particles resulting from the circulating high-energy hydrogen ions borne from NBI.

Dong Chunfeng; Sakaue, Hiroyuki [National Institute for Fusion Science, Toki 509-5292, Gifu (Japan); Morita, Shigeru; Tokitani, Masayuki; Goto, Motoshi [National Institute for Fusion Science, Toki 509-5292, Gifu (Japan); Department of Fusion Science, Graduate University for Advanced Studies, Toki 509-5292, Gifu (Japan); Wang, Erhui [Department of Fusion Science, Graduate University for Advanced Studies, Toki 509-5292, Gifu (Japan); Zushi, Hideki [RIAM, Kyushu University, Kasuga 816-8580, Fukuoka (Japan)

2012-10-15T23:59:59.000Z

25

Cluster beam targets for laser plasma extreme ultraviolet and soft x-ray sources  

DOE Patents (OSTI)

Method and apparatus for producing extreme ultraviolet (EUV) and soft x-ray radiation from an ultra-low debris plasma source are disclosed. Targets are produced by the free jet expansion of various gases through a temperature controlled nozzle to form molecular clusters. These target clusters are subsequently irradiated with commercially available lasers of moderate intensity (10{sup 11}--10{sup 12} watts/cm{sup 2}) to produce a plasma radiating in the region of 0.5 to 100 nanometers. By appropriate adjustment of the experimental conditions the laser focus can be moved 10--30 mm from the nozzle thereby eliminating debris produced by plasma erosion of the nozzle. 5 figs.

Kublak, G.D.; Richardson, M.C.

1996-11-19T23:59:59.000Z

26

Hinode/Extreme-Ultraviolet Imaging Spectrometer Observations of the Temperature Structure of the Quiet Corona  

E-Print Network (OSTI)

We present a Differential Emission Measure (DEM) analysis of the quiet solar corona on disk using data obtained by the Extreme-ultraviolet Imaging Spectrometer (EIS) on Hinode. We show that the expected quiet Sun DEM distribution can be recovered from judiciously selected lines, and that their average intensities can be reproduced to within 30%. We present a subset of these selected lines spanning the temperature range log T = 5.6 to 6.4 K that can be used to derive the DEM distribution reliably, including a subset of Iron lines that can be used to derive the DEM distribution free of the possibility of uncertainties in the elemental abundances. The subset can be used without the need for extensive measurements and the observed intensities can be reproduced to within the estimated uncertainty in the pre-launch calibration of EIS. Furthermore, using this subset, we also demonstrate that the quiet coronal DEM distribution can be recovered on size scales down to the spatial resolution of the instrument (1" pixels...

Brooks, David H; Williams, David R; Watanabe, Tetsuya

2009-01-01T23:59:59.000Z

27

TEMPERATURE AND EXTREME-ULTRAVIOLET INTENSITY IN A CORONAL PROMINENCE CAVITY AND STREAMER  

Science Conference Proceedings (OSTI)

We analyze the temperature and EUV line emission of a coronal cavity and surrounding streamer in terms of a morphological forward model. We use a series of iron line ratios observed with the Hinode Extreme-ultraviolet Imaging Spectrograph (EIS) on 2007 August 9 to constrain temperature as a function of altitude in a morphological forward model of the streamer and cavity. We also compare model predictions to the EIS EUV line intensities and polarized brightness (pB) data from the Mauna Loa Solar Observatory (MLSO) Mark 4 K-coronameter. This work builds on earlier analysis using the same model to determine geometry of and density in the same cavity and streamer. The fit to the data with altitude-dependent temperature profiles indicates that both the streamer and cavity have temperatures in the range 1.4-1.7 MK. However, the cavity exhibits substantial substructure such that the altitude-dependent temperature profile is not sufficient to completely model conditions in the cavity. Coronal prominence cavities are structured by magnetism so clues to this structure are to be found in their plasma properties. These temperature substructures are likely related to structures in the cavity magnetic field. Furthermore, we find that the model overestimates the EUV line intensities by a factor of 4-10, without overestimating pB. We discuss this difference in terms of filling factors and uncertainties in density diagnostics and elemental abundances.

Kucera, T. A. [NASA/GSFC, Code 671, Greenbelt, MD 20771 (United States); Gibson, S. E.; Schmit, D. J. [HAO/NCAR, P.O. Box 3000, Boulder, CO 80307-3000 (United States); Landi, E. [Department of Atmospheric, Oceanic and Space Science, Space Research Building, University of Michigan, 2455 Hayward St., Ann Arbor, MI 48109-2143 (United States); Tripathi, D. [Inter-University Centre for Astronomy and Astrophysics, Post Bag-4, Ganeshkhind, Pune University Campus, Pune 411 007 (India)

2012-09-20T23:59:59.000Z

28

ACTIVE REGION MOSS: DOPPLER SHIFTS FROM HINODE/EXTREME-ULTRAVIOLET IMAGING SPECTROMETER OBSERVATIONS  

Science Conference Proceedings (OSTI)

Studying the Doppler shifts and the temperature dependence of Doppler shifts in moss regions can help us understand the heating processes in the core of the active regions. In this paper, we have used an active region observation recorded by the Extreme-ultraviolet Imaging Spectrometer (EIS) on board Hinode on 2007 December 12 to measure the Doppler shifts in the moss regions. We have distinguished the moss regions from the rest of the active region by defining a low-density cutoff as derived by Tripathi et al. in 2010. We have carried out a very careful analysis of the EIS wavelength calibration based on the method described by Young et al. in 2012. For spectral lines having maximum sensitivity between log T = 5.85 and log T = 6.25 K, we find that the velocity distribution peaks at around 0 km s{sup -1} with an estimated error of 4-5 km s{sup -1}. The width of the distribution decreases with temperature. The mean of the distribution shows a blueshift which increases with increasing temperature and the distribution also shows asymmetries toward blueshift. Comparing these results with observables predicted from different coronal heating models, we find that these results are consistent with both steady and impulsive heating scenarios. However, the fact that there are a significant number of pixels showing velocity amplitudes that exceed the uncertainty of 5 km s{sup -1} is suggestive of impulsive heating. Clearly, further observational constraints are needed to distinguish between these two heating scenarios.

Tripathi, Durgesh [Inter-University Centre for Astronomy and Astrophysics, Pune University Campus, Pune 411007 (India); Mason, Helen E. [Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA (United Kingdom); Klimchuk, James A. [NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)

2012-07-01T23:59:59.000Z

29

Measurements of electron and proton heating temperatures from extreme-ultraviolet light images at 68 eV in petawatt laser experiments  

Science Conference Proceedings (OSTI)

A 68 eV extreme-ultraviolet light imaging diagnostic measures short pulse isochoric heating by electrons and protons in petawatt laser experiments. Temperatures are deduced from the absolute intensities and comparison with modeling using a radiation hydrodynamics code.

Gu Peimin; Zhang, B.; Key, M. H.; Hatchett, S. P.; Barbee, T.; Freeman, R. R.; Akli, K.; Hey, D.; King, J. A.; Mackinnon, A. J.; Snavely, R. A.; Stephens, R. B. [College of Mathematical and Physical Sciences, Ohio State University, 425 Stillman Hall, Columbus, Ohio 43210-1123 (United States); Department of Applied Science, University of California-Davis, Davis, California 95616 (United States); Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550 (United States); College of Mathematical and Physical Sciences, Ohio State University, 425 Stillman Hall, Columbus, Ohio 43210-1123 (United States); Department of Applied Science, University of California-Davis, Davis, California 95616 (United States); University of California-San Diego, La Jolla, California 92093 (United States); Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550 (United States); General Atomics, San Diego, California 92186 (United States)

2006-11-15T23:59:59.000Z

30

HINODE/EXTREME-ULTRAVIOLET IMAGING SPECTROMETER OBSERVATIONS OF THE TEMPERATURE STRUCTURE OF THE QUIET CORONA  

Science Conference Proceedings (OSTI)

We present a differential emission measure (DEM) analysis of the quiet solar corona on disk using data obtained by the Extreme-ultraviolet Imaging Spectrometer (EIS) on Hinode. We show that the expected quiet-Sun DEM distribution can be recovered from judiciously selected lines, and that their average intensities can be reproduced to within 30%. We present a subset of these selected lines spanning the temperature range log T = 5.6-6.4 K that can be used to derive the DEM distribution reliably, including a subset of iron lines that can be used to derive the DEM distribution free of the possibility of uncertainties in the elemental abundances. The subset can be used without the need for extensive measurements, and the observed intensities can be reproduced to within the estimated uncertainty in the pre-launch calibration of EIS. Furthermore, using this subset, we also demonstrate that the quiet coronal DEM distribution can be recovered on size scales down to the spatial resolution of the instrument (1'' pixels). The subset will therefore be useful for studies of small-scale spatial inhomogeneities in the coronal temperature structure, for example, in addition to studies requiring multiple DEM derivations in space or time. We apply the subset to 45 quiet-Sun data sets taken in the period 2007 January to April, and show that although the absolute magnitude of the coronal DEM may scale with the amount of released energy, the shape of the distribution is very similar up to at least log T approx 6.2 K in all cases. This result is consistent with the view that the shape of the quiet-Sun DEM is mainly a function of the radiating and conducting properties of the plasma and is fairly insensitive to the location and rate of energy deposition. This universal DEM may be sensitive to other factors such as loop geometry, flows, and the heating mechanism, but if so they cannot vary significantly from quiet-Sun region to region.

Brooks, David H.; Warren, Harry P. [Space Science Division, Code 7673, Naval Research Laboratory, Washington, DC 20375 (United States); Williams, David R. [Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT (United Kingdom); Watanabe, Tetsuya, E-mail: dhbrooks@ssd5.nrl.navy.mi [National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo 181-8588 (Japan)

2009-11-10T23:59:59.000Z

31

Cluster beam targets for laser plasma extreme ultraviolet and soft x-ray sources  

DOE Patents (OSTI)

Method and apparatus for producing extreme ultra violet (EUV) and soft x-ray radiation from an ultra-low debris plasma source are disclosed. Targets are produced by the free jet expansion of various gases through a temperature controlled nozzle to form molecular clusters. These target clusters are subsequently irradiated with commercially available lasers of moderate intensity (10.sup.11 -10.sup.12 watts/cm.sup.2) to produce a plasma radiating in the region of 0.5 to 100 nanometers. By appropriate adjustment of the experimental conditions the laser focus can be moved 10-30 mm from the nozzle thereby eliminating debris produced by plasma erosion of the nozzle.

Kublak, Glenn D. (124 Turquoise Way, Livermore, Alameda County, CA 94550); Richardson, Martin C. (CREOL

1996-01-01T23:59:59.000Z

32

STIS Ultraviolet Spectral Evidence for Outflows in Extreme Narrow-Line Seyfert 1 Galaxies  

E-Print Network (OSTI)

(abridged) I present and discuss the results of HST STIS observations of IRAS 13224-3809 and 1H 0707-495, two narrow-line Seyfert 1 (NLS1) galaxies. We discovered that high-ionization UV emission lines are much broader and strongly blueshifted compared with the low-ionization and intermediate-ionization lines, which are relatively narrow and centered at the rest wavelength. We interpret this as evidence that the high-ionization lines come from a wind, while the low-ionization lines are emitted from the accretion disk or low-velocity base of the wind. The optically thick disk blocks our view of the receding wind. We also found that not all NLS1s display strongly blueshifted emission lines, and the degree of asymmetry is inversely correlated with the equivalent width and correlated with the SiIII] to CIII] ratio, a density indicator. It may also be significant that these NLS1s display the extreme in the X-ray properties: they have the strongest X-ray soft-excess components and the highest-amplitude, flaring variability. We postulate that this combination of properties are all related to a high value of L/M_BH, even among NLS1s. The high-ionization and low-ionization lines are nearly completely kinematically separated, a fact that allows us to study the conditions in the disk and wind separately.(...)

Karen M. Leighly

2000-12-08T23:59:59.000Z

33

STIS Ultraviolet Spectral Evidence for Outflows in Extreme Narrow-Line Seyfert 1 Galaxies  

E-Print Network (OSTI)

(abridged) I present and discuss the results of HST STIS observations of IRAS 13224-3809 and 1H 0707-495, two narrow-line Seyfert 1 (NLS1) galaxies. We discovered that high-ionization UV emission lines are much broader and strongly blueshifted compared with the low-ionization and intermediate-ionization lines, which are relatively narrow and centered at the rest wavelength. We interpret this as evidence that the high-ionization lines come from a wind, while the low-ionization lines are emitted from the accretion disk or low-velocity base of the wind. The optically thick disk blocks our view of the receding wind. We also found that not all NLS1s display strongly blueshifted emission lines, and the degree of asymmetry is inversely correlated with the equivalent width and correlated with the SiIII] to CIII] ratio, a density indicator. It may also be significant that these NLS1s display the extreme in the X-ray properties: they have the strongest X-ray soft-excess components and the highest-amplitude, flaring var...

Leighly, K M

2000-01-01T23:59:59.000Z

34

Extremism  

Office of Scientific and Technical Information (OSTI)

i i LEFT-WING EXTREMISM: The Current Threat Prepared for U.S. Department of Energy Office of Safeguards and Security Washington, DC Prepared by Karl A. Seger, Ph.D. Center for Human Reliability Studies Oak Ridge Institute for Science and Education Oak Ridge, TN April 2001 ORISE 01-0439 i TABLE OF CONTENTS EXECUTIVE SUMMARY .............................................................................................ii I. LEFTIST EXTREMISM IS ALIVE AND WELL....................................................... 1 TERROR NETWORK U.S.A. ..................................................................................... 1 EXTREMISM ON THE LEFT AND RIGHT .............................................................. 3 THE THREAT.............................................................................................................

35

Absolute intensity calibration of flat-field space-resolved extreme ultraviolet spectrometer using radial profiles of visible and extreme ultraviolet bremsstrahlung continuum emitted from high-density plasmas in Large Helical Device  

Science Conference Proceedings (OSTI)

A precise absolute intensity calibration of a flat-field space-resolved extreme ultraviolet (EUV) spectrometer working in wavelength range of 60-400 A is carried out using a new calibration technique based on radial profile measurement of the bremsstrahlung continuum in Large Helical Device. A peaked vertical profile of the EUV bremsstrahlung continuum has been successfully observed in high-density plasmas (n{sub e}{>=} 10{sup 14} cm{sup -3}) with hydrogen ice pellet injection. The absolute calibration can be done by comparing the EUV bremsstrahlung profile with the visible bremsstrahlung profile of which the absolute value has been already calibrated using a standard lamp. The line-integrated profile of measured visible bremsstrahlung continuum is firstly converted into the local emissivity profile by considering a magnetic surface distortion due to the plasma pressure, and the local emissivity profile of EUV bremsstrahlung is secondly calculated by taking into account the electron temperature profile and free-free gaunt factor. The line-integrated profile of the EUV bremsstrahlung continuum is finally calculated from the local emissivity profile in order to compare with measured EUV bremsstrahlung profile. The absolute intensity calibration can be done by comparing measured and calculated EUV bremsstrahlung profiles. The calibration factor is thus obtained as a function of wavelength with excellent accuracy. It is also found in the profile analysis that the grating reflectivity of EUV emissions is constant along the direction perpendicular to the wavelength dispersion. Uncertainties on the calibration factor determined with the present method are discussed including charge-coupled device operation modes.

Dong Chunfeng; Wang Erhui [Department of Fusion Science, Graduate University for Advanced Studies, Toki 509-5292, Gifu (Japan); Morita, Shigeru; Goto, Motoshi [Department of Fusion Science, Graduate University for Advanced Studies, Toki 509-5292, Gifu (Japan); National Institute for Fusion Science, Toki 509-5292, Gifu (Japan)

2011-11-15T23:59:59.000Z

36

Determination of electron-heated temperatures of petawatt laser-irradiated foil targets with 256 and 68 eV extreme ultraviolet imaging  

Science Conference Proceedings (OSTI)

Measurements of plasma temperature at the rear surface of foil targets due to heating by hot electrons, which were produced in short pulse high intensity laser matter interactions using the 150 J, 0.5 ps Titan laser, are reported. Extreme ultraviolet (XUV) imaging at 256 and 68 eV energies is used to determine spatially resolved target rear surface temperature patterns by comparing absolute intensities to radiation hydrodynamic modeling. XUV mirrors at these two energies were absolutely calibrated at the Advanced Light Source at the Lawrence Berkeley Laboratory. Temperatures deduced from both imagers are validated against each other within the range of 75-225 eV.

Ma, T. [University of California-San Diego, La Jolla, California 92093 (United States); Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); MacPhee, A. G.; Key, M. H.; Hatchett, S. P.; Barbee, T. W.; Mackinnon, A. J.; Patel, P. K. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Akli, K. U.; Stephens, R. B. [General Atomics, San Diego, California 92186 (United States); Chen, C. D. [Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); Freeman, R. R.; Link, A.; Offermann, D. T.; Ovchinnikov, V.; Van Woerkom, L. D. [Ohio State University, Columbus, Ohio (United States); King, J. A.; Beg, F. N. [University of California-San Diego, La Jolla, California 92093 (United States); Zhang, B. [University of California-Davis, Davis, California 95616 (United States)

2008-09-15T23:59:59.000Z

37

In vitro models for investigating keratinocyte responses to ultraviolet B radiation.  

E-Print Network (OSTI)

??This thesis describes the use of 2- and 3-dimensional cell-based models for studying how skin cells respond to ultraviolet radiation. These methods were used to… (more)

Fernandez, Tara L.

2013-01-01T23:59:59.000Z

38

Airborne Doppler Lidar Investigation of Sea Surface Reflectance at a 355-nm Ultraviolet Wavelength  

Science Conference Proceedings (OSTI)

The analysis of the sea surface reflectance for different incidence angles based on observations of an airborne Doppler lidar at an ultraviolet wavelength of 355 nm is described. The results were compared to sea surface reflectance models, ...

Zhigang Li; Christian Lemmerz; Ulrike Paffrath; Oliver Reitebuch; Benjamin Witschas

2010-04-01T23:59:59.000Z

39

HST STIS Ultraviolet Spectral Evidence of Outflow in Extreme Narrow-line Seyfert 1 Galaxies: II. Modeling and Interpretation  

E-Print Network (OSTI)

(Abridged) This is the second of two papers on the UV emission-line properties of Narrow-line Seyfert 1 Galaxies (NLS1s). In the first paper, HST STIS spectra from two extreme NLS1s, IRAS 13224-3809 and 1H 0707-495, were analyzed in detail. In this paper, we present modeling intended to explore the physical conditions of the line-emitting gas. Photoionization modeling using Cloudy was conducted for the broad, blueshifted wind component and the narrow, symmetric, rest-wavelength-centered disk component of the lines separately. For the wind component, a broad range of ionizing flux, column density, density, covering fraction, and a limited range of continuum shape and metallicity were explored. A figure of merit was used to quantitatively evaluate the results of the simulations. We found three minima of the figure of merit in parameter space. We favor the solution characterized by an X-ray weak continuum, metallicity enhanced by a factor of 5 and nitrogen enhanced by a factor of 10 over solar, a small column de...

Leighly, K M

2004-01-01T23:59:59.000Z

40

HST STIS Ultraviolet Spectral Evidence for Outflow in Extreme Narrow-line Seyfert 1 Galaxies: I. Data and Analysis  

E-Print Network (OSTI)

We present HST STIS observations of two extreme NLS1s, IRAS 13224-3809 and 1H 0707-495. The spectra are characterized by very blue continua, broad, strongly blueshifted high-ionization lines (including \\ion{C}{4} and \\ion{N}{5}), and narrow, symmetric intermediate- (including \\ion{C}{3}], \\ion{Si}{3}], \\ion{Al}{3}) and low-ionization (e.g., \\ion{Mg}{2}) lines centered at their rest wavelengths. The emission-line profiles suggest that the high-ionization lines are produced in a wind, and the intermediate- and low-ionization lines are produced in low-velocity gas associated with the accretion disk or base of the wind. In this paper, we present the analysis of the spectra from these two objects; in a companion paper we present photoionization analysis and a toy dynamical model for the wind. The highly asymmetric profile of \\ion{C}{4} suggests that it is dominated by emission from the wind, so we develop a template for the wind from the \\ion{C}{4} line. We model the bright emission lines in the spectra using a combination of this template, and a narrow, symmetric line centered at the rest wavelength. We also analyzed a comparison sample of HST spectra from 14 additional NLS1s, and construct a correlation matrix of emission line and continuum properties. A number of strong correlations were observed, including several involving the asymmetry of the \\ion{C}{4} line.

Karen M. Leighly; John R. Moore

2004-02-19T23:59:59.000Z

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


41

HST STIS Ultraviolet Spectral Evidence for Outflow in Extreme Narrow-line Seyfert 1 Galaxies: I. Data and Analysis  

E-Print Network (OSTI)

We present HST STIS observations of two extreme NLS1s, IRAS 13224-3809 and 1H 0707-495. The spectra are characterized by very blue continua, broad, strongly blueshifted high-ionization lines (including \\ion{C}{4} and \\ion{N}{5}), and narrow, symmetric intermediate- (including \\ion{C}{3}], \\ion{Si}{3}], \\ion{Al}{3}) and low-ionization (e.g., \\ion{Mg}{2}) lines centered at their rest wavelengths. The emission-line profiles suggest that the high-ionization lines are produced in a wind, and the intermediate- and low-ionization lines are produced in low-velocity gas associated with the accretion disk or base of the wind. In this paper, we present the analysis of the spectra from these two objects; in a companion paper we present photoionization analysis and a toy dynamical model for the wind. The highly asymmetric profile of \\ion{C}{4} suggests that it is dominated by emission from the wind, so we develop a template for the wind from the \\ion{C}{4} line. We model the bright emission lines in the spectra using a co...

Leighly, K M; Leighly, Karen M.; Moore, John R.

2004-01-01T23:59:59.000Z

42

HST STIS Ultraviolet Spectral Evidence of Outflow in Extreme Narrow-line Seyfert 1 Galaxies: II. Modeling and Interpretation  

E-Print Network (OSTI)

We present modeling to explore the conditions of the broad-line emitting gas in two extreme Narrow-line Seyfert 1 galaxies, using the observational results described in the first paper of this series. Photoionization modeling using Cloudy was conducted for the broad, blueshifted wind lines and the narrow, symmetric, rest-wavelength-centered disk lines separately. A broad range of physical conditions were explored for the wind component, and a figure of merit was used to quantitatively evaluate the simulation results. Of the three minima in the figure-of-merit parameter space, we favor the solution characterized by an X-ray weak continuum, elevated abundances, a small column density (log(N_H)\\approx 21.4), relatively high ionization parameter (log(U)\\approx -1.2 - -0.2), a wide range of densities (log(n)\\approx 7 - 11), and a covering fraction of ~0.15. The presence of low-ionization emission lines implies the disk component is optically thick to the continuum, and the SiIII]/CIII] ratio implies a density of 10^10 - 10^10.25 cm^-3. A low ionization parameter (log(U)=-3) is inferred for the intermediate-ionization lines, unless the continuum is ``filtered'' through the wind before illuminating the intermediate-line emitting gas, in which case log(U)=-2.1. The location of the emission regions was inferred from the photoionization modeling and a simple ``toy'' dynamical model. A large black hole mass (1.3 x 10^8 M_\\odot) radiating at 11% of the Eddington luminosity is consistent with the kinematics of both the disk and wind lines, and an emission radius of ~10^4 R_S is inferred for both. We compare these results with previous work and discuss implications.

Karen M. Leighly

2004-02-19T23:59:59.000Z

43

R-MATRIX ELECTRON-IMPACT EXCITATION OF Fe{sup 13+} AND ITS APPLICATION TO THE SOFT X-RAY AND EXTREME-ULTRAVIOLET SPECTROSCOPY OF CORONA-LIKE PLASMAS  

SciTech Connect

Accurate excitation parameters are required to interpret the ultraviolet and X-ray spectra of Fe{sup 13+}. In this work, we use the AUTOSTRUCTURE code to describe the atomic structure of Fe{sup 13+}. The 197 lowest-lying fine-structure levels of the 3s{sup x} 3p{sup y} 3d{sup z} (x + y + z = 3), 3s {sup 2}4l, and 3s3p4{l_brace}s, p, and d{r_brace} configurations are included along with further correlation configurations: 3s3p4f, 3p{sup x} 3d{sup y} 4l (x + y = 2), 3l4l'4l'', and 3l3l'5l''. The resultant level energies, lifetimes of excited states, and oscillator strengths of transitions between these levels are assessed by comparison with available experimental data and previous calculations. Electron-impact excitation data among these lowest-lying levels are generated using the intermediate-coupling frame transformation R-matrix method. We assess the present results by comparisons with laboratory measurement for the excitation to the metastable level 3s {sup 2}3p {sup 2} P {sup o} {sub 3/2} and with available close-coupling calculations for other excitations. Using these data and a collisional-radiative model, we have analyzed soft X-ray and extreme-ultraviolet spectra from space satellite observations of a stellar corona and of solar flares, as well as measurements from an electron beam ion trap. We assess the contribution from Fe{sup 13+} emission lines in the solar and Procyon corona observations, and find and identify new lines in the X-ray region observed in the solar and Procyon coronae. The laboratory measurements also confirm that weak lines (218.177 A and 224.354 A) of Fe{sup 13+} contribute to the observed intensities in solar observations. The polarization effect due to the directional monoenergetic distribution of the electron energy has been taken into account in comparison with the laboratory measurements. Electron density diagnostics for the astrophysical plasma sources have been performed using the updated data so as to investigate their sensitivity to the atomic data source.

Liang, G. Y.; Badnell, N. R. [Department of Physics, University of Strathclyde, Glasgow G4 0NG (United Kingdom); Crespo Lopez-Urrutia, J. R.; Baumann, T. M.; Tawara, H.; Ullrich, J. [Max-Planck-Institut fuer Kernphysik, Saupfercheckweg 1, 69117 Heidelberg (Germany); Del Zanna, G. [DAMTP, Centre for Mathematical Sciences, Wilberforce Road, Cambridge CB3 0WA (United Kingdom); Storey, P. J., E-mail: guiyun.liang@strath.ac.u [Department of Physics and Astronomy, University College London, London WC1E 6BT (United Kingdom)

2010-10-15T23:59:59.000Z

44

An investigation of the usefulness of extremely low-frequency electromagnetic measurements for treaty verification  

SciTech Connect

From FY 1986 through FY 1988, we monitored extremely low-frequency (ELF) electromagnetic (EM) fields to determine whether these signals could be detected from underground nuclear explosions. Signals clearly related to underground tests were detected only when the ELF field sensors were located within 10 km of surface ground zero. Theoretical analysis, based on the results of these measurements, shows that the ELF impulse signals from underground nuclear tests are of longer duration than those from lightning sources and are, therefore, less efficient in exciting resonances in the earth-ionosphere cavity, even though the source strength for each may be the same. Thus, ELF signals from underground nuclear tests with yields of <150 kT are generally lower than the background signals caused by worldwide lightning activity. Our conclusion is that ELF monitoring probably will not be useful for detecting underground nuclear tests at distances >10 km from the tests. 16 refs., 24 figs., 3 tabs.

Sweeney, J.J.

1989-01-01T23:59:59.000Z

45

An investigation of the usefulness of extremely low-frequency electromagnetic measurements for treaty verification  

Science Conference Proceedings (OSTI)

From FY 1986 through FY 1988, we monitored extremely low-frequency (ELF) electromagnetic (EM) fields to determine whether these signals could be detected from underground nuclear explosions. Signals clearly related to underground tests were detected only when the ELF field sensors were located within 10 km of surface ground zero. Theoretical analysis, based on the results of these measurements, shows that the ELF impulse signals from underground nuclear tests are of longer duration than those from lightning sources and are, therefore, less efficient in exciting resonances in the earth-ionosphere cavity, even though the source strength for each may be the same. Thus, ELF signals from underground nuclear tests with yields of nuclear tests at distances >10 km from the tests. 16 refs., 24 figs., 3 tabs.

Sweeney, J.J.

1989-01-01T23:59:59.000Z

46

Investigating Operating System Noise in Extreme-Scale High-Performance Computing Systems using Simulation  

SciTech Connect

Hardware/software co-design for future-generation high-performance computing (HPC) systems aims at closing the gap between the peak capabilities of the hardware and the performance realized by applications (application-architecture performance gap). Performance profiling of architectures and applications is a crucial part of this iterative process. The work in this paper focuses on operating system (OS) noise as an additional factor to be considered for co-design. It represents the first step in including OS noise in HPC hardware/software co-design by adding a noise injection feature to an existing simulation-based co-design toolkit. It reuses an existing abstraction for OS noise with frequency (periodic recurrence) and period (duration of each occurrence) to enhance the processor model of the Extreme-scale Simulator (xSim) with synchronized and random OS noise simulation. The results demonstrate this capability by evaluating the impact of OS noise on MPI_Bcast() and MPI_Reduce() in a simulated future-generation HPC system with 2,097,152 compute nodes.

Engelmann, Christian [ORNL

2013-01-01T23:59:59.000Z

47

Social and hydrological responses to extreme precipitations: An interdisciplinary strategy for post-flood investigation  

Science Conference Proceedings (OSTI)

This paper describes and illustrates a methodology to conduct post-flood investigations based on interdisciplinary collaboration between social and physical scientists. The method, designed to explore the link between crisis behavioral response ...

Isabelle Ruin; Céline Lutoff; Brice Boudevillain; Jean-Dominique Creutin; S. Anquetin; M. Bertran Rojo; L. Boissier; L. Bonnifait; M. Borga; L. Colbeau-Justin; L. Creton-Cazanave; G. Delrieu; J. Douvinet; E. Gaume; E. Gruntfest; J.-P. Naulin; O. Payrastre; O. Vannier

48

Diffraction efficiency of 200-nm-period critical-angle transmission gratings in the soft x-ray and extreme ultraviolet wavelength bands  

SciTech Connect

We report on measurements of the diffraction efficiency of 200-nm-period freestanding blazed transmission gratings for wavelengths in the 0.96 to 19.4 nm range. These critical-angle transmission (CAT) gratings achieve highly efficient blazing over a broad band via total external reflection off the sidewalls of smooth, tens of nanometer thin ultrahigh aspect-ratio silicon grating bars and thus combine the advantages of blazed x-ray reflection gratings with those of more conventional x-ray transmission gratings. Prototype gratings with maximum depths of 3.2 and 6 {mu}m were investigated at two different blaze angles. In these initial CAT gratings the grating bars are monolithically connected to a cross support mesh that only leaves less than half of the grating area unobstructed. Because of our initial fabrication approach, the support mesh bars feature a strongly trapezoidal cross section that leads to varying CAT grating depths and partial absorption of diffracted orders. While theory predicts broadband absolute diffraction efficiencies as high as 60% for ideal CAT gratings without a support mesh, experimental results show efficiencies in the range of {approx}50-100% of theoretical predictions when taking the effects of the support mesh into account. Future minimization of the support mesh therefore promises broadband CAT grating absolute diffraction efficiencies of 50% or higher.

Heilmann, Ralf K.; Ahn, Minseung; Bruccoleri, Alex; Chang, Chih-Hao; Gullikson, Eric M.; Mukherjee, Pran; Schattenburg, Mark L.

2011-04-01T23:59:59.000Z

49

Estimation of electron temperature and density of the decay plasma in a laser-assisted discharge plasma extreme ultraviolet source by using a modified Stark broadening method  

Science Conference Proceedings (OSTI)

In order to investigate the plasma expansion behaviors and the electrical recovery process after the maximum implosion in our tin fueled laser-assisted discharge plasma (LDP) 13.5 nm EUV source, we developed and evaluated a cost-efficient spectroscopic method to determine the electron temperature T{sub e} and density n{sub e} simultaneously, by using Stark broadenings of two Sn II isolated lines (5s{sup 2}4f{sup 2}F{sup o}{sub 5/2} - 5s{sup 2}5d{sup 2}D{sub 3/2} 558.9 nm and 5s{sup 2}6d{sup 2}D{sub 5/2} - 5s{sup 2}6p{sup 2}P{sup o}{sub 3/2} 556.2 nm) spontaneously emitted from the plasma. The spatial-resolved evolutions of T{sub e} and n{sub e} of the expansion plasma over 50 to 900 ns after the maximum implosion were obtained using this modified Stark broadening method. According to the different n{sub e} decay characteristics along the Z-pinch axis, the expansion velocity of the electrons was estimated as {approx}1.2 x 10{sup 4} ms{sup -1} from the plasma shell between the electrodes towards the cathode and the anode. The decay time constant of n{sub e} was measured as 183 {+-} 24 ns. Based on the theories of plasma adiabatic expansion and electron-impact ionization, the minimum time-span that electrical recovery between the electrodes needs in order to guarantee the next succeeding regular EUV-emitting discharge was estimated to be 70.5 {mu}s. Therefore, the maximum repetition rate of our LDP EUV source is {approx}14 kHz, which enables the output to reach 125 W/(2{pi}sr).

Zhu Qiushi; Muto, Takahiro; Yamada, Junzaburo; Kishi, Nozomu; Watanabe, Masato; Okino, Akitoshi; Horioka, Kazuhiko; Hotta, Eiki [Department of Energy Sciences, Tokyo Institute of Technology, Yokohama (Japan)

2011-12-15T23:59:59.000Z

50

Ultraviolet Complete Quantum Gravity  

E-Print Network (OSTI)

An ultraviolet complete (UV) quantum gravity theory is formulated in which vertex functions in Feynman graphs are entire functions and the propagating gravitons are described by local, causal propagators. A scalar-tensor action describes classical gravity theory. The cosmological constant problem is investigated in the context of the UV complete quantum gravity.

Moffat, J W

2010-01-01T23:59:59.000Z

51

Exposing the Sensitivity of Extreme Ultraviolet Photoresists  

Science Conference Proceedings (OSTI)

... EUVL sources produce light with wavelengths about an order of magnitude smaller, around 13.5 nanometers. Because ...

2013-07-11T23:59:59.000Z

52

Available Technologies: Extreme Ultraviolet Lithography Tools  

Capable of working with incoherent light sources; Does not require excessive spatial or temporal filtering; Large depth of focus (depending on source properties)

53

Absolute sensitivity calibration of extreme ultraviolet photoresists  

E-Print Network (OSTI)

back to E U V exposures at Sandia National Laboratories inV exposures performed at Sandia National Laboratories in theexposures performed on the Sandia E U V 10x tool and thus is

Naulleau, Patrick

2008-01-01T23:59:59.000Z

54

Using Self-Organizing Maps to Investigate Extreme Climate Events: An Application to Wintertime Precipitation in the Balkans  

Science Conference Proceedings (OSTI)

This paper examines some of the physical mechanisms and remote linkages associated with extreme wintertime precipitation in the Balkans. The analysis is assessed on daily timescales to determine the role of the circulation and atmospheric ...

Tereza Cavazos

2000-05-01T23:59:59.000Z

55

NIST: Ultraviolet Photoemission Electron Microscopy  

Science Conference Proceedings (OSTI)

Ultraviolet Photoemission Electron Microscopy. Summary: Ultraviolet photoemission electron microscopy is used to study ...

2012-11-19T23:59:59.000Z

56

Synchrotron Ultraviolet Radiation Facility SURF III - Calculate ...  

Science Conference Proceedings (OSTI)

Far Ultraviolet Physics Group / Synchrotron Ultraviolet Radiation Facility SURF III The Far Ultraviolet Physics Group maintains and improves the ...

57

Weather Extremes  

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

Extremes Extremes Nature Bulletin No. 45 December 15, 1945 Forest Preserve District of Cook County Clayton F. Smith, President Roberts Mann, Superintendent of Conservation WEATHER EXTREMES Chicago lies in a temperate zone. We are fortunate. The lowest temperature recorded here since the establishment of the Weather Bureau in 1870 was -- 23 F on Dec. 24, 1872. The lowest records elsewhere in the United States are--66 F at Riverside Ranger Station, Yellowstone Park, Wyoming, on Feb. 9, 1933; and -- 78 F at Fort Yukon, Alaska, on Jan. 14, 1934. The lowest record anywhere on earth is 90 F at Verkhoyansk, Siberia, Feb. 5 and 7, 1892. The greatest snowfall recorded in Chicago in one 24-hour period was 14.9 inches on Jan. 30, 1939; but 19.2 inches fell between 1:10 a.m. on March 24 and 8:33 p.m. on March 26, 1930.

58

Ultraviolet absorption hygrometer  

DOE Patents (OSTI)

An ultraviolet absorption hygrometer is provided including a source of pulsed ultraviolet radiation for providing radiation in a first wavelength region where water absorbs significantly and in a second proximate wavelength region where water absorbs weakly. Ultraviolet radiation in the first and second regions which has been transmitted through a sample path of atmosphere is detected. The intensity of the radiation transmitted in each of the first and second regions is compared and from this comparison the amount of water in the sample path is determined.

Gersh, Michael E. (Bedford, MA); Bien, Fritz (Concord, MA); Bernstein, Lawrence S. (Bedford, MA)

1986-01-01T23:59:59.000Z

59

Ultraviolet imaging of hydrogen flames  

DOE Green Energy (OSTI)

We have assembled an ultraviolet-sensitive intensified camera for observing hydrogen combustion by imaging the OH, A/sup 2/..sigma.. - X/sup 2//Pi/ bandhead emissions near 309 nm. The camera consists of a quartz and CaF achromat lense-coupled to an ultraviolet image intensifier which is in turn fiber-coupled to a focus projection scan (FPS) vidicon. The emission band is selected with interference filters which serve to discriminate against background. The camera provides optical gain of 100 to 1000 and is capable of being shuttered at nanosecond speeds and of being framed at over 600 frames per second. We present data from observations of test flames in air at standard RS-170 video rates with varying background conditions. Enhanced images using background subtraction are presented. Finally, we discuss the use of polarizaton effects to further discrimination against sky background. This work began as a feasibility study to investigate ultraviolet technology to detect hydrogen fires for the NASA space program. 6 refs., 7 figs, 2 tabs.

Yates, G.J.; Wilke, M.; King, N.

1988-01-01T23:59:59.000Z

60

Extreme MPG  

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

Extreme MPG Extreme MPG World Record Fuel Efficiency Link to video of Pac Car Link to Pac Car Animation Pac II vehicle and team The PAC-Car II set a new world record in fuel efficient driving during the Shell Eco-marathon in Ladoux (France) on June 26, 2005. Running on hydrogen, the PAC-Car II achieved a fuel economy of 12,665 miles per gallon gasoline equivalent (MPGe)! Most Efficient EPA-Certified Vehicles* Current Model Year 2013 Chevrolet Volt 2014 Chevrolet Volt City 63 Hwy 61 Comb 62 Fuel Type: Gas/Electricity Gasoline - All Years 2000 Honda Insight 2000 Honda Insight City 49 Hwy 61 Comb 53 Fuel Type: Gasoline All Fuels - All Years 2013 Scion iQ EV 2013 Scion iQ EV City 138 Hwy 105 Comb 121 Fuel Type: Electricity *Based on Combined MPG rating. Current Model Year excludes pure EVs.

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


61

PROMINENCE PLASMA DIAGNOSTICS THROUGH EXTREME-ULTRAVIOLET ABSORPTION  

SciTech Connect

In this paper, we introduce a new diagnostic technique that uses EUV and UV absorption to determine the electron temperature and column emission measure, as well as the He/H relative abundance of the absorbing plasma. If a realistic assumption on the geometry of the latter can be made and a spectral code such as CHIANTI is used, then this technique can also yield the absorbing plasma hydrogen and electron density. This technique capitalizes on the absorption properties of hydrogen and helium at different wavelength ranges and temperature regimes. Several cases where this technique can be successfully applied are described. This technique works best when the absorbing plasma is hotter than 15,000 K. We demonstrate this technique on AIA observations of plasma absorption during a coronal mass ejection eruption. This technique can be easily applied to existing observations of prominences and cold plasmas in the Sun from almost all space missions devoted to the study of the solar atmosphere, which we list.

Landi, E. [Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor, MI 48109 (United States); Reale, F. [Dipartimento di Fisica e Chimica, Universita di Palermo, Piazza del Parlamento 1, I-90134 Palermo (Italy)

2013-07-20T23:59:59.000Z

62

Beryllium based multilayers for normal incidence extreme ultraviolet reflectance  

Science Conference Proceedings (OSTI)

We report the experimental results of beryllium based multilayer mirrors for use in the 11.4 nm region. Mirrors using molybdenum as the high-Z material have demonstrated 68.7% peak reflectance at 11.3 nm.

Skulina, K.; Alford, C.; Bionta, R.; Makowiecki, D. [Lawrence Livermore National Lab., CA (United States); Gullikson, E.; Soufli, R.; Kortright, J.; Underwood, J. [Lawrence Berkeley Lab., CA (United States)

1994-11-01T23:59:59.000Z

63

Reflective optical imaging system for extreme ultraviolet wavelengths  

DOE Patents (OSTI)

This invention is comprised of a projection reflection optical system having two mirrors in a coaxial, four reflection configuration to reproduce the image of an object. The mirrors have aspherical reflection surfaces to provide a very high resolution of object feature wavelengths less than 200 {mu}m, and preferably less than 100 {mu}m. An image resolution of features less than 0.05--0.1 {mu}m, is obtained over a large area field; i.e., 25.4 mm {times} 25.4 mm, with a distortion less than 0.1 of the resolution over the image field.

Viswanathan, V.K.; Newnam, B.E.

1991-12-31T23:59:59.000Z

64

Mineralogy under extreme conditions  

Science Conference Proceedings (OSTI)

We have performed measurements of minerals based on the synchrotron source for single crystal and powder X-ray diffraction, inelastic scattering, spectroscopy and radiography by using diamond anvil cells. We investigated the properties of iron (Fe), iron-magnesium oxides (Fe, Mg)O, silica(SiO{sub 2}), iron-magnesium silicates (Fe, Mg)SiO{sub 3} under simulated high pressure-high temperature extreme conditions of the Earth's crust, upper mantle, low mantle, core-mantle boundary, outer core, and inner core. The results provide a new window on the investigation of the mineral properties at Earth's conditions.

Shu, Jinfu (CIW)

2012-02-07T23:59:59.000Z

65

Numerical Simulation of an Open Channel Ultraviolet Waste-water Disinfection Reactor.  

E-Print Network (OSTI)

??The disinfection characteristics of an open channel ultra-violet (UV) wastewater disinfection reactor are investigated using a computational fluid dynamics (CFD) model. The model is based… (more)

Saha, Rajib Kumar

2013-01-01T23:59:59.000Z

66

Extreme Value Techniques  

Science Conference Proceedings (OSTI)

... "Recent approaches to extreme value estimation with application to wind speeds. Part II: prediction of extreme winds." Proceedings of the First ...

67

Biomedical devices from ultraviolet LEDs  

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

Biomedical devices from ultraviolet LEDs Biomedical devices from ultraviolet LEDs Light-emitting nanocrystal diodes go ultraviolet Biomedical devices with active components could be made from nanostructured systems. February 24, 2012 Researcher working with nanocrystals A researcher at LANL works with nanocrystals. Get Expertise Researcher Sergio Brovelli Physical Chem & Applied Spectroscopy Email Research Team Leader Alberto Paleari University of Milano-Bicocca in Italy Such devices could, for example, selectively activate light-sensitive drugs for better medical treatment or probe for the presence of fluorescent markers in medical diagnostics. LEDs produce light in the ultraviolet range A process for creating glass-based, inorganic light-emitting diodes (LEDs) that produce light in the ultraviolet range has been developed by a

68

Extreme Scale Visual Analytics  

Science Conference Proceedings (OSTI)

Extreme-scale visual analytics (VA) is about applying VA to extreme-scale data. The articles in this special issue examine advances related to extreme-scale VA problems, their analytical and computational challenges, and their real-world applications.

Wong, Pak C.; Shen, Han-Wei; Pascucci, Valerio

2012-05-08T23:59:59.000Z

69

NIST, Sensor Science Division, Ultraviolet Radiation Group ...  

Science Conference Proceedings (OSTI)

... Physicist Sensor Science Division Ultraviolet Radiation Group. ... Ph.D. Optical Sciences and Engineering ... Orlando, FL MS Electrical Engineering, The ...

2013-03-21T23:59:59.000Z

70

Diffractive element in extreme-UV lithography condenser  

DOE Patents (OSTI)

Condensers having a mirror with a diffraction grating in projection lithography using extreme ultra-violet significantly enhances critical dimension control. The diffraction grating has the effect of smoothing the illumination at the camera's entrance pupil with minimum light loss. Modeling suggests that critical dimension control for 100 nm features can be improved from 3 nm to less than about 0.5 nm.

Sweatt, William C. (Albuquerque, NM); Ray-Chaudhuri, Avijit (Livermore, CA)

2001-01-01T23:59:59.000Z

71

Diffractive element in extreme-UV lithography condenser  

DOE Patents (OSTI)

Condensers having a mirror with a diffraction grating in projection lithography using extreme ultra-violet significantly enhances critical dimension control. The diffraction grating has the effect of smoothing the illumination at the camera's entrance pupil with minimum light loss. Modeling suggests that critical dimension control for 100 nm features can be improved from 3 nm to less than about 0.5 nm.

Sweatt, William C. (Albuquerque, NM); Ray-Chaudhurl, Avijit K. (Livermore, CA)

2000-01-01T23:59:59.000Z

72

Measurement and analysis of near ultraviolet solar radiation  

DOE Green Energy (OSTI)

The photocatalytic detoxification of organic contaminants is currently being investigated by a number of laboratories, universities, and institutions throughout the world. The photocatalytic oxidation process requires that contaminants come in contact with a photocatalyst such as titanium dioxide, under illumination of ultraviolet (UV) radiation in order for the decomposition reaction to take place. Researches from the National Renewable Energy Laboratory (NREL) and Sandia National Laboratories are currently investigating the use of solar energy as a means of driving this photocatalytic process. Measurements of direct-normal and global-horizontal ultraviolet (280--385 nm) and full-spectrum (280--4000 nm) solar radiation taken in Golden, Colorado over a one-year period are analyzed, and comparisons are made with data generated from a clear-sky solar radiation model (BRITE) currently in use for predicting the performance of solar detoxification processes. Analysis of the data indicates a ratio of global-horizontal ultraviolet to full-spectrum radiation of 4%--6% that is weakly dependent on air mass. Conversely, data for direct-normal ultraviolet radiation indicate a much large dependence on air mass, with a ratio of approximately 5% at low air mass to 1% at higher at masses. Results show excellent agreement between the measured data and clear-sky predictions for both the ultraviolet and the full-spectrum global-horizontal radiation. For the direct-normal components, however, the tendency is for the clear-sky model to underpredict the measured that. Averaged monthly ultraviolet radiation available for the detoxification process indicates that the global-horizontal component of the radiation exceeds the direct-normal component throughout the year. 9 refs., 7 figs.

Mehos, M.S.; Pacheco, K.A.; Link, H.F.

1991-12-01T23:59:59.000Z

73

Quasi-Decadal Variability of the Stratosphere: Influence of Long-Term Solar Ultraviolet Variations  

Science Conference Proceedings (OSTI)

A multiple regression statistical model is applied to investigate the existence of upper-stratospheric ozone, temperature, and zonal wind responses to long-term (solar cycle) changes in solar ultraviolet radiation using 11.5 years of reprocessed ...

L. L. Hood; J. L. Jirikowic; J. P. McCormack

1993-12-01T23:59:59.000Z

74

Extreme-UV electrical discharge source  

DOE Patents (OSTI)

An extreme ultraviolet and soft x-ray radiation electric capillary discharge source that includes a boron nitride housing defining a capillary bore that is positioned between two electrodes one of which is connected to a source of electric potential can generate a high EUV and soft x-ray radiation flux from the capillary bore outlet with minimal debris. The electrode that is positioned adjacent the capillary bore outlet is typically grounded. Pyrolytic boron nitride, highly oriented pyrolytic boron nitride, and cubic boron nitride are particularly suited. The boron nitride capillary bore can be configured as an insert that is encased in an exterior housing that is constructed of a thermally conductive material. Positioning the ground electrode sufficiently close to the capillary bore outlet also reduces bore erosion.

Fornaciari, Neal R. (Tracey, CA); Nygren, Richard E. (Los Ranchos de Albuquerque, NM); Ulrickson, Michael A. (Albuquerque, NM)

2002-01-01T23:59:59.000Z

75

Extreme Computing | Argonne National Laboratory  

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

Extreme Computing Extreme Computing Petascale computing and the emerging era of exascale computing pose numerous challenges, both from the underlying hardware architectures and the...

76

NIST, Sensor Science Division, Ultraviolet Radiation Group ...  

Science Conference Proceedings (OSTI)

Uwe Arp. Dr. Uwe Arp is a physicist in the Ultraviolet Radiation Group of the Sensor Science Division in the Physical Measurement Laboratory. ...

2013-08-19T23:59:59.000Z

77

Ultraviolet Germicidal Irradiation for Preventing Infectious...  

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

Ultraviolet Germicidal Irradiation for Preventing Infectious Disease Transmission Speaker(s): Peng Xu Date: February 19, 2002 - 12:00pm Location: Bldg. 90 The transmission of...

78

Advanced Instrumentation for Extreme Environments  

Science Conference Proceedings (OSTI)

The Department of Energy (DOE) Office of Nuclear Energy (NE) is pursuing embedded instrumentation and controls (I&C) technology for next generation nuclear power generation applications. Embedded systems encompass a wide range of configurations and technologies; we define embedding in this instance as the integration of the sensors and the control system design into the component design using a systems engineering process. Embedded I&C systems are often an essential part of developing new capabilities, improving reliability, enhancing performance, and reducing operational costs. The new intrinsically safe, more efficient, and cost effective reactor technologies (Next Generation Nuclear Plant and Small Modular Reactors) require the development and application of new I&C technologies. These new designs raise extreme environmental challenges such as high temperatures (over 700 C) and material compatibility (e.g., molten salts). The desired reliability and functionality requires measurements in these extreme conditions including high radiation environments which were not previously monitored in real time. The DOE/NE Nuclear Energy Enabling Technologies (NEET) program currently has several projects investigating I&C technologies necessary to make these reactor designs realizable. The project described in this paper has the specific goal of investigating embedded I&C with the following objectives: 1.Explore and quantify the potential gains from embedded I&C improved reliability, increased performance, and reduced cost 2.Identify practical control, sensing, and measurement techniques for the extreme environments found in high-temperature reactors 3.Design and fabricate a functional prototype high-temperature cooling pump for molten salts represents target demonstration of improved performance, reliability, and widespread usage There are many engineering challenges in the design of a high-temperature liquid salt cooling pump. The pump and motor are in direct contact with molten fluoride salt at 700 C (1,292 F) as part of a reactor cooling loop. The motor-pump combination during normal operation would be red-hot (Figure 1). This environment challenges every facet of the design including seals, wiring, magnetic materials, and sensors. In this paper, we discuss the challenges of sensor design in extreme environments and specifically the sensor design for a high-temperature fluoride salt coolant pump. This pump will be used as a test-bed for embedded I&C development and validation in extreme environments.

Melin, Alexander M [ORNL; Kisner, Roger [ORNL; Fugate, David L [ORNL

2013-01-01T23:59:59.000Z

79

Microgap ultra-violet detector  

DOE Patents (OSTI)

A microgap ultra-violet detector of photons with wavelengths less than 400 run (4000 Angstroms) which comprises an anode and a cathode separated by a gas-filled gap and having an electric field placed across the gap. Either the anode or the cathode is semi-transparent to UV light. Upon a UV photon striking the cathode an electron is expelled and accelerated across the gap by the electric field causing interactions with other electrons to create an electron avalanche which contacts the anode. The electron avalanche is detected and converted to an output pulse.

Wuest, Craig R. (Danville, CA); Bionta, Richard M. (Livermore, CA)

1994-01-01T23:59:59.000Z

80

NIST Ultraviolet Source Helps NASA Spacecraft Measure the ...  

Science Conference Proceedings (OSTI)

... space weather can originate. NIST's unique 'sliding spark source' (inside the glass tubing) feeds ultraviolet (UV) light into NASA's Solar Ultraviolet ...

2010-09-28T23:59:59.000Z

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


81

Nano-Enabled Titanium Dioxide Ultraviolet Protective Layers for...  

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

Nano-Enabled Titanium Dioxide Ultraviolet Protective Layers for Cool-Color Roofing Research Project Nano-Enabled Titanium Dioxide Ultraviolet Protective Layers for Cool-Color...

82

Generating multivariate extreme value distributions  

E-Print Network (OSTI)

We define in a probabilistic way a parametric family of multivariate extreme value distributions. We derive its copula, which is a mixture of several complete dependent copulas and total independent copulas, and the bivariate tail dependence and extremal coefficients. Based on the obtained results for these coefficients, we propose a method to built multivariate extreme value distributions with prescribed tail/extremal coefficients. We illustrate the results with examples of simulation of these distributions.

Ferreira, Helena

2012-01-01T23:59:59.000Z

83

The USDA Ultraviolet Radiation Monitoring Program  

Science Conference Proceedings (OSTI)

The U.S. Department of Agriculture's Ultraviolet (UV) Radiation Monitoring Program has been measuring UV radiation since 1994. The initial network of 12 stations employed broadband meters to measure UVB irradiance and included ancillary ...

D. S. Bigelow; J. R. Slusser; A. F. Beaubien; J. H. Gibson

1998-04-01T23:59:59.000Z

84

A Nonstationary Extreme Value Analysis for the Assessment of Changes in Extreme Annual Wind Speed over the Gulf of St. Lawrence, Canada  

Science Conference Proceedings (OSTI)

Changes in the extreme annual wind speed in and around the Gulf of St. Lawrence (Canada) were investigated through a nonstationary extreme value analysis of the annual maximum 10-m wind speed obtained from the North American Regional Reanalysis (...

Y. Hundecha; A. St-Hilaire; T. B. M. J. Ouarda; S. El Adlouni; P. Gachon

2008-11-01T23:59:59.000Z

85

Liquid-tin-jet laser-plasma extreme ultraviolet generation P. A. C. Jansson,a)  

E-Print Network (OSTI)

liquid nitrogen,8 and argon9 for 1 keV, micros- copy and reflectometry , and hard x rays copper solutions of liquefied inert gases such as xenon. Finally, the new range of target materials allows improved flexibility

86

Time-resolved visible and extreme ultraviolet spectroscopy of laser-produced tin plasma  

E-Print Network (OSTI)

to exceed electron thermal energy by more than 100 times,following components: thermal energy of the electrons andenergy and electron thermal energy shown in Figure 5.30. The

O'Shay, Joseph Fred

2007-01-01T23:59:59.000Z

87

THE CORONAL SOURCE OF EXTREME-ULTRAVIOLET LINE PROFILE ASYMMETRIES IN SOLAR ACTIVE REGION OUTFLOWS  

SciTech Connect

High-resolution spectra from the Hinode EUV Imaging Spectrometer have revealed that coronal spectral line profiles are sometimes asymmetric, with a faint enhancement in the blue wing on the order of 100 km s{sup -1}. These asymmetries could be important since they may be subtle yet diagnostically useful signatures of coronal heating or solar wind acceleration processes. It has also been suggested that they are signatures of chromospheric jets supplying mass and energy to the corona. Until now, however, there have been no studies of the physical properties of the plasma producing the asymmetries. Here we identify regions of asymmetric profiles in the outflows of AR 10978 using an asymmetric Gaussian function and extract the intensities of the faint component using multiple Gaussian fits. We then derive the temperature structure and chemical composition of the plasma producing the asymmetries. We find that the asymmetries are dependent on temperature, and are clearer and stronger in coronal lines. The temperature distribution peaks around 1.4-1.8 MK with an emission measure at least an order of magnitude larger than that at 0.6 MK. The first ionization potential bias is found to be 3-5, implying that the high-speed component of the outflows may also contribute to the slow-speed wind. Observations and models indicate that it takes time for plasma to evolve to a coronal composition, suggesting that the material is trapped on closed loops before escaping, perhaps by interchange reconnection. The results, therefore, identify the plasma producing the asymmetries as having a coronal origin.

Brooks, David H. [College of Science, George Mason University, 4400 University Drive, Fairfax, VA 22030 (United States); Warren, Harry P., E-mail: dhbrooks@ssd5.nrl.navy.mil [Space Science Division, Naval Research Laboratory, Washington, DC 20375 (United States)

2012-11-20T23:59:59.000Z

88

Grazing incidence extreme ultraviolet spectrometer fielded with time resolution in a hostile Z-pinch environment  

Science Conference Proceedings (OSTI)

This recently developed diagnostic was designed to allow for time-gated spectroscopic study of the EUV radiation (4 nm power generator (1 MA, 100 ns risetime) at University of Nevada, Reno on a series of wire array z-pinch loads. Within this harsh z-pinch environment, radiation yields routinely exceed 20 kJ in the EUV and soft x-ray. There are also strong mechanical shocks, high velocity debris, sudden vacuum changes during operation, energic ion beams, and hard x-ray radiation in excess of 50 keV. The spectra obtained from the precursor plasma of an Al double planar wire array contained lines of Al IX and AlX ions indicating a temperature near 60 eV during precursor formation. Detailed results will be presented showing the fielding specifications and the techniques used to extract important plasma parameters using this spectrometer.

Williamson, K. M.; Kantsyrev, V. L.; Safronova, A. S.; Wilcox, P. G.; Cline, W.; Batie, S.; LeGalloudec, B.; Nalajala, V.; Astanovitsky, A. [Plasma Physics and Diagnostics Laboratory, Physics Department, University of Nevada, Reno, Nevada 89557 (United States)

2011-09-15T23:59:59.000Z

89

Time-resolved visible and extreme ultraviolet spectroscopy of laser-produced tin plasma  

E-Print Network (OSTI)

plasma: an optically thin corona and an optically thick conductionplasma heating occurs indirectly through radiative transfer and electron conduction.conduction carries energy in the laser absorption zone beyond the critical surface to heat the higher density plasma.

O'Shay, Joseph Fred

2007-01-01T23:59:59.000Z

90

The coronal source of extreme-ultraviolet line profile asymmetries in solar active region outflows  

E-Print Network (OSTI)

High resolution spectra from the Hinode EUV Imaging Spectrometer (EIS) have revealed that coronal spectral line profiles are sometimes asymmetric, with a faint enhancement in the blue wing on the order of 100 km/s. These asymmetries could be important since they may be subtle, yet diagnostically useful signatures of coronal heating or solar wind acceleration processes. It has also been suggested that they are signatures of chromospheric jets supplying mass and energy to the corona. Until now, however, there have been no studies of the physical properties of the plasma producing the asymmetries. Here we identify regions of asymmetric profiles in the outflows of AR 10978 using an asymmetric Gaussian function and extract the intensities of the faint component using multiple Gaussian fits. We then derive the temperature structure and chemical composition of the plasma producing the asymmetries. We find that the asymmetries are dependent on temperature, and are clearer and stronger in coronal lines. The temperatur...

Brooks, David H

2012-01-01T23:59:59.000Z

91

Time-resolved visible and extreme ultraviolet spectroscopy of laser-produced tin plasma  

E-Print Network (OSTI)

blackbody radiation.emit equilibrium (blackbody) radiation characteristic of theand that lost to blackbody radiation from the reemission

O'Shay, Joseph Fred

2007-01-01T23:59:59.000Z

92

Ultrafast Strong-Field Vibrational Dynamics Studied by Femtosecond Extreme-Ultraviolet Transient Absorption Spectroscopy  

E-Print Network (OSTI)

difference in dispersion caused by the inert gas between thespectral dispersion employing the VCR semi-infinite gasspectral dispersion employing the VCR semi-infinite gas

Hosler, Erik Robert

2013-01-01T23:59:59.000Z

93

Nanometer-scale ablation using focused, coherent extreme ultraviolet/soft x-ray light  

DOE Patents (OSTI)

Ablation of holes having diameters as small as 82 nm and having clean walls was obtained in a poly(methyl methacrylate) on a silicon substrate by focusing pulses from a Ne-like Ar, 46.9 nm wavelength, capillary-discharge laser using a freestanding Fresnel zone plate diffracting into third order is described. Spectroscopic analysis of light from the ablation has also been performed. These results demonstrate the use of focused coherent EUV/SXR light for the direct nanoscale patterning of materials.

Menoni, Carmen S. (Fort Collins, CO); Rocca, Jorge J. (Fort Collins, CO); Vaschenko, Georgiy (San Diego, CA); Bloom, Scott (Encinitas, CA); Anderson, Erik H. (El Cerrito, CA); Chao, Weilun (El Cerrito, CA); Hemberg, Oscar (Stockholm, SE)

2011-04-26T23:59:59.000Z

94

Wavelength-specific reflections: A decade of extreme ultraviolet actinic mask inspection research  

E-Print Network (OSTI)

experiments to commercial inspection tool prototypes, the authors survey the recent history of work of their effect on the reflected field of the aerial image. Owing to the resonant response of multilayer mirrors not significantly disturb the EUV aerial image. As we look to the future, with shrinking design rules and ever

95

Extreme Winds and Wind Effects on Structures  

Science Conference Proceedings (OSTI)

Extreme Winds and Wind Effects on Structures. The Engineering ... section. I. Extreme Winds: ... II. Wind Effects on Buildings. Database ...

2013-01-17T23:59:59.000Z

96

Ultraviolet Germicidal Irradiation for Preventing Infectious Disease  

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

Ultraviolet Germicidal Irradiation for Preventing Infectious Disease Ultraviolet Germicidal Irradiation for Preventing Infectious Disease Transmission Speaker(s): Peng Xu Date: February 19, 2002 - 12:00pm Location: Bldg. 90 The transmission of tuberculosis (TB) and other infectious diseases in health-care buildings has been a recognized hazard for decades. Ultraviolet germicidal irradiation (UVGI) of upper room air is used as an engineering control method to prevent the spread of airborne infectious disease. Under full-scale conditions, the efficacy of UVGI for inactivating airborne bacterial spores and active cells was evaluated. A test room fitted with a modern UVGI system was used to conduct bio-aerosol inactivation experiments. UVGI efficacy can be affected by environmental factors such as relative humidity (RH), and air mixing

97

Global Warming and Extreme Weather  

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

Global Warming and Extreme Weather Global Warming and Extreme Weather Speaker(s): Michael Wehner Date: November 28, 2006 - 12:00pm Location: 90-3122 Seminar Host/Point of Contact: Surabi Menon Extreme weather events can have serious impacts on human and ecological systems. Changes in the magnitude and frequency of extreme weather associated with changes in the mean climate are likely the most serious consequence of human induced global warming. Understanding what the future portends is vital if society hopes to adapt to the very different world that awaits. In this talk, we will exploit simple extreme value theory to make predictions about the late 21st century climate. Current work on the relationship between global warming and the hurricane cycle will also be presented. The bottom line is that events that are considered rare today

98

Mesoscale Predictability of an Extreme Warm-Season Precipitation Event  

Science Conference Proceedings (OSTI)

A mesoscale model is used to investigate the mesoscale predictability of an extreme precipitation event over central Texas on 29 June 2002 that lasted through 7 July 2002. Both the intrinsic and practical aspects of warm-season predictability, ...

Fuqing Zhang; Andrew M. Odins; John W. Nielsen-Gammon

2006-04-01T23:59:59.000Z

99

Extremal Quantum Correlations and Cryptographic Security  

E-Print Network (OSTI)

We investigate fundamental properties of device independent security in quantum cryptography and show a one-to-one correspondence between extremal and secure probability distributions. This allows us to give a characterization of security in algebraic terms. We apply the method to common examples for two-party as well as multi-party setups and present a scheme for verifying the security of correlations with two parties, two measurement settings, and two outcomes.

Franz, T; Werner, R F

2010-01-01T23:59:59.000Z

100

Empirical Studies of Tropospheric Transmission in the Ultraviolet: Broadband Measurements  

Science Conference Proceedings (OSTI)

This work examines the effects of absorption and scattering in the troposphere on solar ultraviolet radiation reaching the ground. A site was established in the city of Chicago for monitoring broadband ultraviolet irradiance, total sunlight, and ...

John E. Frederick; Anne E. Koob; Amy D. Alberts; Elizabeth C. Weatherhead

1993-12-01T23:59:59.000Z

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


101

Onsite Wastewater Treatment Systems: Ultraviolet Light Disinfection  

E-Print Network (OSTI)

Some onsite wastewater treatment systems include a disinfection component. This publication explains how homeowners can disinfect wastewater with ultraviolet light, what the components of such a system are, what factors affect the performance of a UV light disinfection system, and how to maintain such a system.

Lesikar, Bruce J.

2008-10-02T23:59:59.000Z

102

Microwave-driven ultraviolet light sources  

DOE Patents (OSTI)

A microwave-driven ultraviolet (UV) light source is provided. The light source comprises an over-moded microwave cavity having at least one discharge bulb disposed within the microwave cavity. At least one magnetron probe is coupled directly to the microwave cavity.

Manos, Dennis M. (Williamsburg, VA); Diggs, Jessie (Norfolk, VA); Ametepe, Joseph D. (Roanoke, VA)

2002-01-29T23:59:59.000Z

103

Bipolar charging of dust particles under ultraviolet radiation  

SciTech Connect

The photoemission charging of dust particles under ultraviolet radiation from a xenon lamp has been investigated. The velocities of yttrium dust particles with a work function of 3.3 eV and their charges have been determined experimentally; the latter are about 400-500 and about 100 elementary charges per micron of radius for the positively and negatively charged fractions, respectively. The dust particle charging and the dust cloud evolution in a photoemission cell after exposure to an ultraviolet radiation source under the applied voltage have been simulated numerically. The photoemission charging of dust particles has been calculated on the basis of nonlocal and local charging models. Only unipolar particle charging is shown to take place in a system of polydisperse dust particles with the same photoemission efficiency. It has been established that bipolar charging is possible in the case of monodisperse particles with different quantum efficiencies. Polydispersity in this case facilitates the appearance of oppositely charged particles in a photoemission plasma.

Filippov, A. V., E-mail: fav@triniti.ru; Babichev, V. N. [Troitsk Institute for Innovation and Fusion Research, State Research Center of the Russian Federation (Russian Federation); Fortov, V. E.; Gavrikov, A. V. [Russian Academy of Sciences, Joint Institute for High Temperatures (Russian Federation); Pal', A. F. [Troitsk Institute for Innovation and Fusion Research, State Research Center of the Russian Federation (Russian Federation); Petrov, O. F. [Russian Academy of Sciences, Joint Institute for High Temperatures (Russian Federation); Starostin, A. N.; Sarkarov, N. E. [Troitsk Institute for Innovation and Fusion Research, State Research Center of the Russian Federation (Russian Federation)

2011-05-15T23:59:59.000Z

104

Extreme wave impinging and overtopping  

E-Print Network (OSTI)

This investigates the velocity fields of a plunging breaking wave impinging on a structure through measurements in a two-dimensional wave tank. As the wave breaks and overtops the structure, so-called green water is generated. The flow becomes multi-phased and chaotic as a highly aerated region is formed in the flow in the vicinity of the structure while water runs up onto the structure. In this study, particle image velocimetry (PIV) was employed to measure the velocity field of the water dominant region. For measurements of an aerated region that cannot be measured by PIV, a new measurement method called bubble image velocimetry (BIV) was developed. The principle and setup of the BIV method were introduced and validated. Mean and turbulence properties were obtained through ensemble averaging repeated tests measured by both methods. The dominant and maximum velocity of the breaking wave and associated green water are discussed for the three distinct phases of the impingement-runup-overtopping sequence. The distribution of the green water velocity along the top of the structure has a nonlinear profile and the maximum velocity occurs near the front of the fast moving water. Using the measured data and applying dimensional analysis, a similarity profile for the green water flow on top of the structure was obtained, and a prediction equation was formulated. The dam breaking solution used for the green water prediction was examined with determining initial water depth based on the experiment conditions. Comparison between measurements, the prediction equation, and the dam breaking flow was made. The prediction equation and the dam break flow with appropriate initial water depth may be used to predict the green water velocity caused by extreme waves in a hurricane. To demonstrate the aeration of the breaking wave and overtopping water, void fraction was also investigated. There is strong aeration in the region of overtopping water front generated by a plunging breaker. Void fraction of overtopping water was measured using a fiber optic reflectometer (FOR). The measured velocity and void fraction were also used to estimate flow rate and water volume of overtopping water.

Ryu, Yong Uk

2006-08-01T23:59:59.000Z

105

Extremal Quantum Correlations and Cryptographic Security  

E-Print Network (OSTI)

We investigate a fundamental property of device independent security in quantum cryptography by characterizing probability distributions which are necessarily independent of the measurement results of any eavesdropper. We show that probability distributions that are secure in this sense are exactly the extremal quantum probability distributions. This allows us to give a characterization of security in algebraic terms. We apply the method to common examples for two-party as well as multi-party setups and present a scheme for verifying security of probability distributions with two parties, two measurement settings, and two outcomes.

T. Franz; F. Furrer; R. F. Werner

2010-10-06T23:59:59.000Z

106

Extremal graphs without 4-cycles  

Science Conference Proceedings (OSTI)

We prove an upper bound for the number of edges a C"4-free graph on q^2+q vertices can contain for q even. This upper bound is achieved whenever there is an orthogonal polarity graph of a plane of even order q. Keywords: Extremal graph, Polarity, Projective plane

Frank A. Firke, Peter M. Kosek, Evan D. Nash, Jason Williford

2013-05-01T23:59:59.000Z

107

Protection Against Ionizing Radiation in Extreme Radiation ...  

Science Conference Proceedings (OSTI)

Protection Against Ionizing Radiation in Extreme Radiation-resistant Microorganisms. ... Elucidated radiation protection by intracellular halides. ...

2013-05-01T23:59:59.000Z

108

Nanograting-based compact vacuum ultraviolet spectrometer and ...  

Nanograting-based compact vacuum ultraviolet spectrometer and beam pro?ler for in situ characterization of high-order harmonic generation light sources

109

UVOC-MAC: a MAC protocol for outdoor ultraviolet networks  

Science Conference Proceedings (OSTI)

UVOC-MAC: a MAC protocol for outdoor ultraviolet networks. Yiyang Li • Jianxia Ning • Zhengyuan Xu •. Srikanth V. Krishnamurthy • Gang Chen. Ó Springer ...

110

Extremely high frequency RF effects on electronics.  

SciTech Connect

The objective of this work was to understand the fundamental physics of extremely high frequency RF effects on electronics. To accomplish this objective, we produced models, conducted simulations, and performed measurements to identify the mechanisms of effects as frequency increases into the millimeter-wave regime. Our purpose was to answer the questions, 'What are the tradeoffs between coupling, transmission losses, and device responses as frequency increases?', and, 'How high in frequency do effects on electronic systems continue to occur?' Using full wave electromagnetics codes and a transmission-line/circuit code, we investigated how extremely high-frequency RF propagates on wires and printed circuit board traces. We investigated both field-to-wire coupling and direct illumination of printed circuit boards to determine the significant mechanisms for inducing currents at device terminals. We measured coupling to wires and attenuation along wires for comparison to the simulations, looking at plane-wave coupling as it launches modes onto single and multiconductor structures. We simulated the response of discrete and integrated circuit semiconductor devices to those high-frequency currents and voltages, using SGFramework, the open-source General-purpose Semiconductor Simulator (gss), and Sandia's Charon semiconductor device physics codes. This report documents our findings.

Loubriel, Guillermo Manuel; Vigliano, David; Coleman, Phillip Dale; Williams, Jeffery Thomas; Wouters, Gregg A.; Bacon, Larry Donald; Mar, Alan

2012-01-01T23:59:59.000Z

111

Studying Materials Under Extreme Pressure  

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

Studying Materials Under Extreme Pressure Studying Materials Under Extreme Pressure Coupling undulator radiation from Advanced Photon Source (APS) beamlines 3-ID and 13-ID to nuclear resonant inelastic scattering techniques, researchers have determined the phonon density of states for iron under pressures up to 153 gigapascals, equivalent to those found at the Earth's core. Image of the Earth's core. Although indirect measurements and theory have, since the early 1950s, produced an informed picture of the structure and composition of the materials that make up the core of the Earth, direct proof and the answers to some intriguing questions remain unanswered. Previously, ultrahigh-pressure experiments using nuclear resonant inelastic scattering have been difficult to carry out due the tiny samples required.

112

Ultraviolet Resonant Raman Enhancements in the Detection of Explosives  

Science Conference Proceedings (OSTI)

Raman-based spectroscopy is potentially militarily useful for standoff detection of high explosives. Normal (non-resonance) and resonance Raman spectroscopies are both light scattering techniques that use a laser to measure the vibrational spectrum of a sample. In resonance Raman, the laser is tuned to match the wavelength of a strong electronic absorbance in the molecule of interest, whereas, in normal Raman the laser is not tuned to any strong electronic absorbance bands. The selection of appropriate excitation wavelengths in resonance Raman can result in a dramatic increase in the Raman scattering efficiency of select band(s) associated with the electronic transition. Other than the excitation wavelength, however, resonance Raman is performed experimentally the same as normal Raman. In these studies, normal and resonance Raman spectral signatures of select solid high explosive (HE) samples and explosive precursors were collected at 785 nm, 244 nm and 229 nm. Solutions of PETN, TNT, and explosive precursors (DNT & PNT) in acetonitrile solvent as an internal Raman standard were quantitatively evaluated using ultraviolet resonance Raman (UVRR) microscopy and normal Raman spectroscopy as a function of power and select excitation wavelengths. Use of an internal standard allowed resonance enhancements to be estimated at 229 nm and 244 nm. Investigations demonstrated that UVRR provided {approx}2000-fold enhancement at 244 nm and {approx}800-fold improvement at 229 nm while PETN showed a maximum of {approx}25-fold at 244 nm and {approx}190-fold enhancement at 229 nm solely from resonance effects when compared to normal Raman measurements. In addition to the observed resonance enhancements, additional Raman signal enhancements are obtained with ultraviolet excitation (i.e., Raman scattering scales as !4 for measurements based on scattered photons). A model, based partly on the resonance Raman enhancement results for HE solutions, is presented for estimating Raman enhancements for solid HE samples.

Short, B J; Carter, J C; Gunter, D; Hovland, P; Jagode, H; Karavanic, K; Marin, G; Mellor-Crummey, J; Moore, S; Norris, B; Oliker, L; Olschanowsky, C; Roth, P C; Schulz, M; Shende, S; Snavely, A; Spear, W

2009-06-03T23:59:59.000Z

113

The GALEX Ultraviolet Atlas of Nearby Galaxies  

E-Print Network (OSTI)

We present images, integrated photometry, surface-brightness and color profiles for a total of 1034 nearby galaxies recently observed by the GALEX satellite in its far-ultraviolet (FUV; 1516A) and near-ultraviolet (NUV; 2267A) bands. (...) This data set has been complemented with archival optical, near-infrared, and far-infrared fluxes and colors. We find that the integrated (FUV-K) color provides robust discrimination between elliptical and spiral/irregular galaxies and also among spiral galaxies of different sub-types. Elliptical galaxies with brighter K-band luminosities (i.e. more massive) are redder in (NUV-K) color but bluer in (FUV-NUV) than less massive ellipticals. In the case of the spiral/irregular galaxies our analysis shows the presence of a relatively tight correlation between the (FUV-NUV) color and the total infrared-to-UV ratio. The correlation found between (FUV-NUV) color and K-band luminosity (with lower luminosity objects being bluer than more luminous ones) can be explained as due to an increase in the dust content with galaxy luminosity. The images in this Atlas along with the profiles and integrated properties are publicly available through a dedicated web page at http://nedwww.ipac.caltech.edu/level5/GALEX_Atlas/

A. Gil de Paz; S. Boissier; B. F. Madore; M. Seibert; Y. H. Joe; A. Boselli; T. K. Wyder; D. Thilker; L. Bianchi; S. -C. Rey; R. M. Rich; T. A. Barlow; T. Conrow; K. Forster; P. G. Friedman; D. C. Martin; P. Morrissey; S. G. Neff; D. Schiminovich; T. Small; J. Donas; T. M. Heckman; Y. -W. Lee; B. Milliard; A. S. Szalay; S. Yi

2006-06-19T23:59:59.000Z

114

Building Technologies Office: Nano-Enabled Titanium Dioxide Ultraviolet  

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

Nano-Enabled Titanium Nano-Enabled Titanium Dioxide Ultraviolet Protective Layers for Cool-Color Roofing Research Project to someone by E-mail Share Building Technologies Office: Nano-Enabled Titanium Dioxide Ultraviolet Protective Layers for Cool-Color Roofing Research Project on Facebook Tweet about Building Technologies Office: Nano-Enabled Titanium Dioxide Ultraviolet Protective Layers for Cool-Color Roofing Research Project on Twitter Bookmark Building Technologies Office: Nano-Enabled Titanium Dioxide Ultraviolet Protective Layers for Cool-Color Roofing Research Project on Google Bookmark Building Technologies Office: Nano-Enabled Titanium Dioxide Ultraviolet Protective Layers for Cool-Color Roofing Research Project on Delicious Rank Building Technologies Office: Nano-Enabled Titanium Dioxide

115

High silicon content silylating reagents for dry-developed positive-tone resists for extreme ultraviolet (13.5 nm) and deep ultraviolet (248 nm) microlithography  

SciTech Connect

Recent results in the use of disilanes as silylating reagents for near-surface imaging with deep-UV (248 nm) and EUV (13.5 nm) lithography are reported. A relatively thin imaging layer of a photo-cross-linking resist is spun over a thicker layer of hard-baked resist that functions as a planarizing layer and antireflective coating. Photoinduced acid generation and subsequent heating crosslinks and renders exposed areas impermeable to an aminodisilane that reacts with the unexposed regions. Subsequent silylation and reactive ion etching afford a positive-tone image. The use of disilanes introduces a higher concentration of silicon into the polymer than is possible with silicon reagents that incorporate only one silicon atom per reactive site. The higher silicon content in the silylated polymer increases etching selectivity between exposed and unexposed regions and thereby increases the contrast. Additional improvements that help to minimize flow during silylation are also discussed, including the addition of bifunctional disilanes. We have resolved high aspect ratio, very high quality 0.20 {mu}m line and space patterns at 248 nm with a stepper having a numerical aperture (NA)= 0.53, and have resolved {<=} 0.15 {mu}m line and spaces at 13.5 nm.

Wheeler, D.; Scharrer, E.; Kubiak, G. [and others

1994-12-31T23:59:59.000Z

116

Advanced Materials and Processes for Extreme Environments  

Science Conference Proceedings (OSTI)

Symposium, Advanced Materials and Reservoir Engineering for Extreme Oil & Gas Environments. Presentation Title, Advanced Materials and Processes for ...

117

Accelerator Mass Spectrometry: Extreme Sensitivity in Biological ...  

THE LLNL TECHNOLOGY COMPANY PRODUCT 24 Partnering Today: Technology Transfer Highlights Accelerator Mass Spectrometry: Extreme Sensitivity in Biological Research

118

Extreme Winds and Wind Effects on Structures  

Science Conference Proceedings (OSTI)

Extreme Winds and Wind Effects on Structures. Description/Summary: The Building and Fire Research Laboratory has an ...

2010-10-04T23:59:59.000Z

119

Nanocrystalline and Nanotwinned Metals under Extreme Environment  

Science Conference Proceedings (OSTI)

The applicability of nanostructured metals under extreme environment (high temperature, ... of Transport Phenomena for Enhanced Oil Recovery Applications .

120

Controlled doping of graphene using ultraviolet irradiation  

SciTech Connect

The electronic properties of graphene are tunable via doping, making it attractive in low dimensional organic electronics. Common methods of doping graphene, however, adversely affect charge mobility and degrade device performance. We demonstrate a facile shadow mask technique of defining electrodes on graphene grown by chemical vapor deposition (CVD) thereby eliminating the use of detrimental chemicals needed in the corresponding lithographic process. Further, we report on the controlled, effective, and reversible doping of graphene via ultraviolet (UV) irradiation with minimal impact on charge mobility. The change in charge concentration saturates at {approx}2 Multiplication-Sign 10{sup 12} cm{sup -2} and the quantum yield is {approx}10{sup -5} e/photon upon initial UV exposure. This simple and controlled strategy opens the possibility of doping wafer-size CVD graphene for diverse applications.

Luo Zhengtang [Department of Chemical and Biomolecular Engineering, Hong Kong University of Science and Technology, Clear Water Bay (Hong Kong); Pinto, Nicholas J.; Davila, Yarely [Department of Physics and Electronics, University of Puerto Rico at Humacao, Humacao, 00792 (Puerto Rico); Charlie Johnson, A. T. [Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6396 (United States)

2012-06-18T23:59:59.000Z

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


121

Estimation of Extreme Wind Speeds with Very Long Return Periods  

Science Conference Proceedings (OSTI)

Long series of hourly mean wind speeds and the maximum hourly 3-s gust are simulated for four sites in the British Isles in order to investigate methods for the determination of extreme wind speed events. The simulation is performed using a one-...

M. D. G. Dukes; J. P. Palutikof

1995-09-01T23:59:59.000Z

122

Element abundances in cool white dwarfs. II. Ultraviolet observations of DZ white dwarfs  

E-Print Network (OSTI)

We present a small data base of homogeneously derived photospheric element abundances of DZ white dwarfs and related objects. Our previous investigations are supplemented with the analysis of ultraviolet spectra for nine white dwarfs. Of particular interest is the detection of Lalpha absorption in van Maanen 2 and a determination of the effective temperature of this star. The new value is about 1000K lower than previous results due to the strong ultraviolet absorption by metals which has to be considered consistently. The metal abundances of our sample stars are compatible with the predictions from the two-phase accretion model of Dupuis et al. (1992, 1993). Small deviations can be observed for the abundance ratios in some objects. This could indicate non-solar metal-to-metal ratios in the accreted material. Hydrogen can be detected in virtually all of our objects. However, its average accretion rate must be at least two orders of magnitude lower than the metal accretion rate.

B. Wolff; D. Koester; J. Liebert

2002-04-24T23:59:59.000Z

123

POST-FLARE ULTRAVIOLET LIGHT CURVES EXPLAINED WITH THERMAL INSTABILITY OF LOOP PLASMA  

Science Conference Proceedings (OSTI)

In the present work, we study the C8 flare that occurred on 2000 September 26 at 19:49 UT and observed by the Solar and Heliospheric Observatory/Solar Ultraviolet Measurement of Emitted Radiation spectrometer from the beginning of the impulsive phase to well beyond the disappearance in the X-rays. The emission first decayed progressively through equilibrium states until the plasma reached 2-3 MK. Then, a series of cooler lines, i.e., Ca X, Ca VII, Ne VI, O IV, and Si III (formed in the temperature range log T = 4.3-6.3 under equilibrium conditions), are emitted at the same time and all evolve in a similar way. Here, we show that the simultaneous emission of lines with such a different formation temperature is due to thermal instability occurring in the flaring plasma as soon as it has cooled below {approx}2 MK. We can qualitatively reproduce the relative start time of the light curves of each line in the correct order with a simple (and standard) model of a single flaring loop. The agreement with the observed light curves is greatly improved, and a slower evolution of the line emission is predicted, if we assume that the model loop consists of an ensemble of subloops or strands heated at slightly different times. Our analysis can be useful for flare observations with the Solar Dynamics Observatory/Extreme ultraviolet Variability Experiment.

Reale, F. [Dipartimento di Fisica, Universita degli Studi di Palermo, Piazza del Parlamento 1, 90134 Palermo (Italy); Landi, E. [Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor, MI 48109 (United States); Orlando, S. [INAF-Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, 90134 Palermo (Italy)

2012-02-10T23:59:59.000Z

124

Far Ultraviolet Spectroscopic Explorer Spectroscopy of the Nova-like BB Doradus  

E-Print Network (OSTI)

We present an analysis of the Far Ultraviolet Spectroscopic Explorer ({\\it{FUSE}}) spectra of the little-known southern nova-like BB Doradus. The spectrum was obtained as part of our Cycle 8 {\\it FUSE} survey of high declination nova-like stars. The FUSE spectrum of BB Dor, observed in a high state, is modeled with an accretion disk with a very low inclination (possibly lower than 10deg). Assuming an average WD mass of 0.8 solar leads to a mass accretion rate of 1.E-9 Solar mass/year and a distance of the order of 650 pc, consistent with the extremely low galactic reddening in its direction. The spectrum presents some broad and deep silicon and sulfur absorption lines, indicating that these elements are over-abundant by 3 and 20 times solar, respectively.

P. Godon; E. M. Sion; P. E. Barrett; P. Szkody; E. M. Schlegel

2008-05-27T23:59:59.000Z

125

Far Ultraviolet Spectroscopic Explorer Spectroscopy of the Nova-like BB Doradus  

E-Print Network (OSTI)

We present an analysis of the Far Ultraviolet Spectroscopic Explorer ({\\it{FUSE}}) spectra of the little-known southern nova-like BB Doradus. The spectrum was obtained as part of our Cycle 8 {\\it FUSE} survey of high declination nova-like stars. The FUSE spectrum of BB Dor, observed in a high state, is modeled with an accretion disk with a very low inclination (possibly lower than 10deg). Assuming an average WD mass of 0.8 solar leads to a mass accretion rate of 1.E-9 Solar mass/year and a distance of the order of 650 pc, consistent with the extremely low galactic reddening in its direction. The spectrum presents some broad and deep silicon and sulfur absorption lines, indicating that these elements are over-abundant by 3 and 20 times solar, respectively.

Godon, P; Barrett, P E; Szkody, P; Schlegel, E M

2008-01-01T23:59:59.000Z

126

Granular gases under extreme driving  

E-Print Network (OSTI)

We study inelastic gases in two dimensions using event-driven molecular dynamics simulations. Our focus is the nature of the stationary state attained by rare injection of large amounts of energy to balance the dissipation due to collisions. We find that under such extreme driving, with the injection rate much smaller than the collision rate, the velocity distribution has a power-law high energy tail. The numerically measured exponent characterizing this tail is in excellent agreement with predictions of kinetic theory over a wide range of system parameters. We conclude that driving by rare but powerful energy injection leads to a well-mixed gas and constitutes an alternative mechanism for agitating granular matter. In this distinct nonequilibrium steady-state, energy cascades from large to small scales. Our simulations also show that when the injection rate is comparable with the collision rate, the velocity distribution has a stretched exponential tail.

W. Kang; J. Machta; E. Ben-Naim

2010-02-04T23:59:59.000Z

127

Deinococcus geothermalis: The Pool of Extreme Radiation Resistance Genes Shrinks  

SciTech Connect

Bacteria of the genus Deinococcus are extremely resistant to ionizing radiation (IR), ultraviolet light (UV) and desiccation. The mesophile Deinococcus radiodurans was the first member of this group whose genome was completely sequenced. Analysis of the genome sequence of D. radiodurans, however, failed to identify unique DNA repair systems. To further delineate the genes underlying the resistance phenotypes, we report the whole-genome sequence of a second Deinococcus species, the thermophile Deinococcus geothermalis, which at itsoptimal growth temperature is as resistant to IR, UV and desiccation as D. radiodurans, and a comparative analysis of the two Deinococcus genomes. Many D. radiodurans genes previously implicated in resistance, but for which no sensitive phenotype was observed upon disruption, are absent in D. geothermalis. In contrast, most D. radiodurans genes whose mutants displayed a radiation-sensitive phenotype in D. radiodurans are conserved in D. geothermalis. Supporting the existence of a Deinococcus radiation response regulon, a common palindromic DNA motif was identified in a conserved set of genes associated with resistance, and a dedicated transcriptional regulator was predicted. We present the case that these two species evolved essentially the same diverse set of gene families, and that the extreme stress-resistance phenotypes of the Deinococcus lineage emerged progressively by amassing cell-cleaning systems from different sources, but not by acquisition of novel DNA repair systems. Our reconstruction of the genomic evolution of the Deinococcus-Thermus phylum indicates that the corresponding set of enzymes proliferated mainly in the common ancestor of Deinococcus. Results of the comparative analysis weaken the arguments for a role of higher-order chromosome alignment structures in resistance; more clearly define and substantially revise downward the number of uncharacterized genes that might participate in DNA repair and contribute to resistance; and strengthen the case for a role in survival of systems involved in manganese and iron homeostasis.

Makarova, Kira S.; Omelchenko, Marina V.; Gaidamakova, Elena K.; Matrosova, Vera Y.; Vasilenko, Alexander; Zhai, Min; Lapidus, Alla; Copeland, Alex; Kim, Edwin; Land, Miriam; Mavrommatis, Konstantinos; Pitluck, Samuel; Richardson, Paul M.; Detter, Chris; Brettin, Thomas; Saunders, Elizabeth; Lai, Barry; Ravel, Bruce; Kemner, Kenneth M.; Wolf, Yuri I.; Sorokin, Alexander; Gerasimova, Anna V.; Gelfand, Mikhail S.; Fredrickson, James K.; Koonin, Eugene V.; Daly, Michael J.

2007-07-24T23:59:59.000Z

128

Announcing the Argonne Training Program on Extreme-Scale Computing...  

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

Announcing the Argonne Training Program on Extreme-Scale Computing Argonne Training Program on Extreme-Scale Computing Providing Extreme-Scale Supercomputing Training for...

129

Quantitative imaging of living cells by deep ultraviolet microscopy  

E-Print Network (OSTI)

Developments in light microscopy over the past three centuries have opened new windows into cell structure and function, yet many questions remain unanswered by current imaging approaches. Deep ultraviolet microscopy ...

Zeskind, Benjamin J

2006-01-01T23:59:59.000Z

130

Tropospheric Influence on Solar Ultraviolet Radiation: The Role of Clouds  

Science Conference Proceedings (OSTI)

Measurements obtained from several Robertson-Berger (RB) meters over the course of one year define the role of cloud cover in moderating biologically effective ultraviolet radiation at the Earth's surface. In an annual mean sense, clouds reduce ...

John E. Frederick; Hilary E. Snell

1990-03-01T23:59:59.000Z

131

Total Ozone Determination from the Backscattered Ultraviolet (BUV) Experiment  

Science Conference Proceedings (OSTI)

The algorithm used to derive total ozone from the Nimbus 4 Backscattered Ultraviolet (BUV) experiment is described. A seven-year global data set with more than one million retrievals has been produced and archived using this algorithm. The ...

K. F. Klenk; P. K. Bhartia; V. G. Kaveeshwar; R. D. McPeters; P. M. Smith; A. J. Fleig

1982-11-01T23:59:59.000Z

132

Ultraviolet Index Forecasts Issued by the National Weather Service  

Science Conference Proceedings (OSTI)

The National Weather Service (NWS), in collaboration with the Environmental Protection Agency (EPA), now issues an Ultraviolet (UV) index forecast. The UV index (UVI) is a mechanism by which the American public is forewarned of the next day's ...

Craig S. Long; Alvin J. Miller; Hai-Tien Lee; Jeannette D. Wild; Richard C. Przywarty; Drusilia Hufford

1996-04-01T23:59:59.000Z

133

A CCD Spectroradiometer for Ultraviolet Actinic Radiation Measurements  

Science Conference Proceedings (OSTI)

A new spectroradiometer for spectral measurements of ultraviolet (UV) atmospheric radiation (290–400 nm) using a charge coupled device (CCD) as a detector is introduced. The instrument development is motivated by the need for measurements with (a)...

Evelyn Jäkel; Manfred Wendisch; Mario Blumthaler; Rainer Schmitt; Ann R. Webb

2007-03-01T23:59:59.000Z

134

A Two-Path, Two-Wavelength Ultraviolet Hygrometer  

Science Conference Proceedings (OSTI)

An ultraviolet-absorption hygrometer for airborne use was designed and tested. Here the principles of operation, the design, and the results of the first test flights are presented. The motivation for the new design is to overcome the ...

Andrew J. Weinheimer; Ronald L. Schwiesow

1992-08-01T23:59:59.000Z

135

Estimation of Ultraviolet-B Irradiance under Variable Cloud Conditions  

Science Conference Proceedings (OSTI)

Methods to estimate the irradiance of ultraviolet-B (UVB; 280–320 nm) radiation are needed to assess biological effects of changes in atmospheric composition. Measurements of the spatial distribution of sky cloud cover, temporal variability of ...

Richard H. Grant; Gordon M. Heisler

2000-06-01T23:59:59.000Z

136

Extremely Low Temperature | Open Energy Information  

Open Energy Info (EERE)

Extremely Low Temperature Extremely Low Temperature Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Print PDF Sanyal Temperature Classification: Extremely Low Temperature Dictionary.png Extremely Low Temperature: No definition has been provided for this term. Add a Definition Sanyal Temp Classification This temperature scheme was developed by Sanyal in 2005 at the request of DOE and GEA, as reported in Classification of Geothermal Systems: A Possible Scheme. Extremely Low Temperature Very Low Temperature Low Temperature Moderate Temperature High Temperature Ultra High Temperature Steam Field Reservoir fluid less than 100°C is considered to to be "extremely low temperature." Note: Sanyal classified fluids of these temperatures to be "non-electrical grade" in 2005, but electricity has since been generated from these

137

Extremely Hazardous Substances Risk Management Act (Delaware)  

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

This act lays out provisions for local governments to implement regulations and standards for the management of extremely hazardous substances, which are defined and categorized as follows:

138

Extreme Value Analysis of Heart Beat Fluctuations  

Science Conference Proceedings (OSTI)

We have performed an extreme value analysis of the heart beat fluctuations. We have analyzed 24?h ECG time series: by considering both

C. Pennetta; S. Conte

2009-01-01T23:59:59.000Z

139

Chemical Effect of Dry and Wet Cleaning of the Ru Protective Layer of the Extreme ultraviolet (EUV) Lithography Reflector  

E-Print Network (OSTI)

Park, Physical Chemistry Chemical Y.B. He, et al. , JournalChemical Effect of Dry and Wet Cleaning of the Ru ProtectiveBerkeley, California 94720 Chemical Sciences Division,

Belau, Leonid

2010-01-01T23:59:59.000Z

140

Electron-Heated Target Temperature Measurements in Petawatt Laser Experiments Based on Extreme Ultraviolet Imaging and Spectroscopy  

Science Conference Proceedings (OSTI)

Three independent methods (XUV spectroscopy, imaging at 68 eV and 256 eV) have been used to measure planar target rear surface plasma temperature due to heating by hot electrons. The hot electrons are produced by ultra-intense laser plasma interactions using the 150 J, 0.5 ps Titan laser. Soft x-ray spectroscopy in the 50-400 eV region and imaging at the 68 eV and 256 eV photon energies were used to determine the rear surface temperature of planar CD targets. Temperatures were found to be in the 60-150 eV range, with good agreement between the three diagnostics.

Ma, T; Beg, F; Macphee, A; Chung, H; Key, M; Mackinnon, A; Patel, P; Hatchett, S; Akli, K; Stephens, R; Chen, C; Freeman, R; Link, A; Offermann, D; Ovchinnikov, V; VanWoerkom, L; Zhang, B

2008-05-02T23:59:59.000Z

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


141

Optimization of extreme ultraviolet photons emission and collection in mass-limited laser produced plasmas for lithography application  

SciTech Connect

The progress in development of commercial system for next generation EUV lithography requires, among other factors, significant improvement in EUV photon sources such as discharge produced plasma (DPP) and laser produced plasma (LPP) devices. There are still many uncertainties in determining the optimum device since there are many parameters for the suitable and efficient energy source and target configuration and size. Complex devices with trigger lasers in DPP or with pre-pulsing in LPP provide wide area for optimization in regards to conversion efficiency (CE) and components lifetime. We considered in our analysis a promising LPP source configuration using 10-30 {mu}m tin droplet targets, and predicted conditions for the most efficient EUV radiation output and collection as well as calculating photons source location and size. We optimized several parameters of dual-beam lasers and their relationship to target size. We used our HEIGHTS comprehensive and integrated full 3D simulation package to study and optimize LPP processes with various target sizes to maximize the CE of the system.

Sizyuk, T.; Hassanein, A. [Center for Materials under Extreme Environment, School of Nuclear Engineering, Purdue University, West Lafayette, Indiana 47907 (United States)

2012-08-01T23:59:59.000Z

142

Aminodisilanes as silylating agents for dry-developed positive-tone resists for extreme ultraviolet (13.5) microlithography  

SciTech Connect

We recently described a near-surface imaging scheme that employs disilanes and a bilayer resist scheme which together dramatically improve silicon contrast. A relatively thin 0.25 to 0.1 {mu}m imaging layer of a chemically amplified photo-crosslinking resist (Shipley XP-8844 or XP-9472) is spin coated on top of a thicker (0.25-0.5 {mu}m) layer of hard-baked resist (such as Shipley MP-1807). This bilayer scheme improves silicon contrast and provides additional advantages such as providing a planarizing layer and a processing layer.

Wheeler, D. [Sandia National Labs., Albuquerque, NM (United States); Kubiak, G.; Henderson, C.; Ray-Chadhuri, A. [Sandia National Labs., Livermore, CA (United States)

1996-02-01T23:59:59.000Z

143

Development of extreme ultraviolet and soft x-ray multilayer optics for scientific studies with femtosecond/attosecond sources  

E-Print Network (OSTI)

132] J. Arthur. Status of the LCLS x-ray FEL program. Reviewelectron lasers(such as LCLS at Stanford[132]) are expected

Aquila, Andrew Lee

2009-01-01T23:59:59.000Z

144

DISASTER POLICY Including Extreme Emergent Situations (EES)  

E-Print Network (OSTI)

on the ACGME website with information relating to the ACGME response to the disaster. 3. The University-specific Program Requirements. Defined Responsibilities Following the Declaration of a Disaster or Extreme EmergentPage 123 DISASTER POLICY Including Extreme Emergent Situations (EES) The University of Connecticut

Oliver, Douglas L.

145

Complex Plasma Research Under Extreme Conditions  

Science Conference Proceedings (OSTI)

Complex plasma research under extreme conditions is described. The extreme conditions include low-dimensionality for self-organized structures of dust particles, dust magnetization in high magnetic field, criticality in phase transition, and cryogenic environment for Coulomb crystals and dust dynamics.

Ishihara, Osamu [Faculty of Engineering, Yokohama National University 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501 (Japan)

2008-09-07T23:59:59.000Z

146

Information Causality and Extremal Tripartite Correlations  

E-Print Network (OSTI)

We study the principle of information causality for the set of extremal correlations in the tripartite scenario. We show that all but one nonlocal extremal correlations in this scenario violate information causality. This undetected correlation is shown to satisfy any bipartite physical principle.

Yang, Tzyh Haur; Almeida, Mafalda; Teo, Colin; Scarani, Valerio

2011-01-01T23:59:59.000Z

147

Understanding Simulated Extreme Precipitation Events in Madison, Wisconsin, and the Role of Moisture Flux Convergence during the Late Twentieth and Twenty-First Centuries  

Science Conference Proceedings (OSTI)

Understanding extreme precipitation events in the current and future climate system is an important aspect of climate change for adaptation and mitigation purposes. The current study investigates extreme precipitation events over Madison, ...

Kathleen D. Holman; Stephen J. Vavrus

2012-06-01T23:59:59.000Z

148

Building Energy Software Tools Directory: EXTREMES  

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

EXTREMES EXTREMES EXTREMES logo. Synthesizes extreme, but statistically possible, hot, cold or average sequences of hourly weather data for periods of up to one week for a specified month and for 329 locations in North America, with the capability of modifying or expanding the data for greater flexibility. Such data are needed in the design of building heating and cooling systems, particularly systems which utilize some form of energy storage. Screen Shots Keywords extreme weather, weather sequences, simulation, energy calculation Validation/Testing N/A Expertise Required Student or engineer of HVAC system design. Low level of computer literacy required. Users Worldwide distribution. Useful for U.S. and Canada locations Audience Researchers, Students, Engineers and Architects

149

Mesoscale Processes Contributing to Extreme Rainfall in a Midlatitude Warm-Season Flash Flood  

Science Conference Proceedings (OSTI)

Observations and numerical simulations are used to investigate the atmospheric processes that led to extreme rainfall and resultant destructive flash flooding in eastern Missouri on 6–7 May 2000. In this event, a quasi-stationary mesoscale ...

Russ S. Schumacher; Richard H. Johnson

2008-10-01T23:59:59.000Z

150

Dynamical Structure of Extreme Floods in the U.S. Midwest and the United Kingdom  

Science Conference Proceedings (OSTI)

Twenty extreme spring floods that occurred in the Ohio basin between 1901 and 2008, identified from daily river discharge data, are investigated and compared to the April 2011 Ohio River flood event. Composites of synoptic fields for the flood ...

Jennifer Nakamura; Upmanu Lall; Yochanan Kushnir; Andrew W. Robertson; Richard Seager

2013-04-01T23:59:59.000Z

151

Increasing Trend of Synoptic Activity and Its Relationship with Extreme Rain Events over Central India  

Science Conference Proceedings (OSTI)

The nature of the increasing frequency of extreme rainfall events (ERE) in central India is investigated by relating their occurrence to synoptic activity. Using a long record of the paths and intensities of monsoon synoptic disturbances, a ...

R. S. Ajayamohan; William J. Merryfield; Viatcheslav V. Kharin

2010-02-01T23:59:59.000Z

152

Changes in Precipitation Extremes in the Hawaiian Islands in a Warming Climate  

Science Conference Proceedings (OSTI)

For the first time, trends of five climate change indices related to extreme precipitation events in the Hawaiian Islands are investigated using daily observational records from the 1950s to 2007. Four indices [simple daily intensity index (SDII),...

Pao-Shin Chu; Ying Ruan Chen; Thomas A. Schroeder

2010-09-01T23:59:59.000Z

153

Occurrence of Extreme Precipitation Events in California and Relationships with the Madden–Julian Oscillation  

Science Conference Proceedings (OSTI)

California receives most of the annual precipitation during the boreal winter season. Additionally, large spatial and temporal variations in the total rainfall amounts are observed. This study investigates the occurrence of extreme precipitation ...

Charles Jones

2000-10-01T23:59:59.000Z

154

Projected Changes in Mean and Extreme Precipitation in Africa under Global Warming. Part I: Southern Africa  

Science Conference Proceedings (OSTI)

This study investigates likely changes in mean and extreme precipitation over southern Africa in response to changes in radiative forcing using an ensemble of global climate models prepared for the Intergovernmental Panel on Climate Change (IPCC) ...

M. E. Shongwe; G. J. van Oldenborgh; B. J. J. M. van den Hurk; B. de Boer; C. A. S. Coelho; M. K. van Aalst

2009-07-01T23:59:59.000Z

155

Influence of South Atlantic Sea Surface Temperatures on Rainfall Variability and Extremes over Southern Africa  

Science Conference Proceedings (OSTI)

It is generally agreed that changing climate variability, and the associated change in climate extremes, may have a greater impact on environmentally vulnerable regions than a changing mean. This research investigates rainfall variability, ...

C. J. R. Williams; D. R. Kniveton; R. Layberry

2008-12-01T23:59:59.000Z

156

Global Occurrences of Extreme Precipitation and the Madden–Julian Oscillation: Observations and Predictability  

Science Conference Proceedings (OSTI)

This study investigates 1) the eastward propagation of the Madden–Julian oscillation (MJO) and global occurrences of extreme precipitation, 2) the degree to which a general circulation model with a relatively realistic representation of the MJO ...

Charles Jones; Duane E. Waliser; K. M. Lau; W. Stern

2004-12-01T23:59:59.000Z

157

Simulated Links between Deforestation and Extreme Cold Events in South America  

Science Conference Proceedings (OSTI)

Many modeling studies have indicated that deforestation will increase the average annual temperature in the Amazon. However, few studies have investigated the potential for deforestation to change the frequency and intensity of extreme events. ...

David Medvigy; Robert L. Walko; Roni Avissar

2012-06-01T23:59:59.000Z

158

An Orography-Associated Extreme Rainfall Event during TiMREX: Initiation, Storm Evolution, and Maintenance  

Science Conference Proceedings (OSTI)

This study investigates a long-duration mesoscale system with extremely heavy rainfall over southwest Taiwan during the Terrain-influenced Monsoon Rainfall Experiment (TiMREX). This mesoscale convective system develops offshore and stays quasi-...

Weixin Xu; Edward J. Zipser; Yi-Leng Chen; Chuntao Liu; Yu-Chieng Liou; Wen-Chau Lee; Ben Jong-Dao Jou

2012-08-01T23:59:59.000Z

159

Subseasonal and Interannual Temperature Variability in Relation to Extreme Temperature Occurrence over East Asia  

Science Conference Proceedings (OSTI)

This study investigates interannual variability in the frequency of occurrence of daily surface air temperature (SAT) extremes over East Asia in summer and winter between 1979 and 2009. We examine the dominant seasonal SAT patterns, as obtained ...

Hiroyuki Ito; Nathaniel C. Johnson; Shang-Ping Xie

160

CHARACTERIZING ULTRAVIOLET AND INFRARED OBSERVATIONAL PROPERTIES FOR GALAXIES. I. INFLUENCES OF DUST ATTENUATION AND STELLAR POPULATION AGE  

SciTech Connect

The correlation between infrared-to-ultraviolet luminosity ratio and ultraviolet color (or ultraviolet spectral slope), i.e., the IRX-UV (or IRX-{beta}) relation, found in studies of starburst galaxies is a prevalent recipe for correcting extragalactic dust attenuation. Considerable dispersion in this relation discovered for normal galaxies, however, complicates its usability. In order to investigate the cause of the dispersion and to have a better understanding of the nature of the IRX-UV relation, in this paper, we select five nearby spiral galaxies, and perform spatially resolved studies on each of the galaxies, with a combination of ultraviolet and infrared imaging data. We measure all positions within each galaxy and divide the extracted regions into young and evolved stellar populations. By means of this approach, we attempt to discover separate effects of dust attenuation and stellar population age on the IRX-UV relation for individual galaxies. In this work, in addition to dust attenuation, stellar population age is interpreted to be another parameter in the IRX-UV function, and the diversity of star formation histories is suggested to disperse the age effects. At the same time, strong evidence shows the need for more parameters in the interpretation of observational data, such as variations in attenuation/extinction law. Fractional contributions of different components to the integrated luminosities of the galaxies suggest that the integrated measurements of these galaxies, which comprise different populations, would weaken the effect of the age parameter on IRX-UV diagrams. The dependence of the IRX-UV relation on luminosity and radial distance in galaxies presents weak trends, which offers an implication of selective effects. The two-dimensional maps of the UV color and the infrared-to-ultraviolet ratio are displayed and show a disparity in the spatial distributions between the two galaxy parameters, which offers a spatial interpretation of the scatter in the IRX-UV relation.

Mao Yewei; Kong Xu [Center for Astrophysics, University of Science and Technology of China, Hefei 230026 (China); Kennicutt, Robert C. Jr. [Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge, CB3 0HA (United Kingdom); Hao, Cai-Na [Tianjin Astrophysics Center, Tianjin Normal University, Tianjin 300387 (China); Zhou Xu, E-mail: owen81@mail.ustc.edu.cn, E-mail: xkong@ustc.edu.cn [National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China)

2012-09-20T23:59:59.000Z

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


161

Ultraviolet Renormalization of the Nelson Hamiltonian through Functional Integration  

E-Print Network (OSTI)

Starting from the N-particle Nelson Hamiltonian defined by imposing an ultraviolet cutoff, we perform ultraviolet renormalization by showing that in the zero cutoff limit a self-adjoint operator exists after a logarithmically divergent term is subtracted from the original Hamiltonian. We obtain this term as the diagonal part of a pair interaction appearing in the density of a Gibbs measure derived from the Feynman-Kac representation of the Hamiltonian. Also, we show existence of a weak coupling limit of the renormalized Hamiltonian and derive an effective Yukawa interaction potential between the particles.

M. Gubinelli; F. Hiroshima; J. Lorinczi

2013-04-24T23:59:59.000Z

162

Extreme Scale Computing, Co-design  

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

Extreme Scale Computing, Co-design Extreme Scale Computing, Co-design Extreme Scale Computing, Co-design Computational co-design may facilitate revolutionary designs in the next generation of supercomputers. Get Expertise Tim Germann Physics and Chemistry of Materials Email Allen McPherson Energy and Infrastructure Analysis Email Turab Lookman Physics and Condensed Matter and Complex Systems Email Computational co-design involves developing the interacting components of a computational system as a whole. Informing system design, ensuring productive and efficient code Project Description To address the increasingly complex problems of the modern world, scientists at Los Alamos are pushing the scale of computing to the extreme, forming partnerships with other national laboratories and industry to

163

Measures of Economic Impacts of Weather Extremes  

Science Conference Proceedings (OSTI)

One of the primary driving forces behind weather research and development has been the losses caused by weather extremes. Unfortunately, available loss values have been more qualitative than quantitative. There has never been a concerted, ...

Stanley D. Changnon

2003-09-01T23:59:59.000Z

164

Extreme Rainfall Events in the Hawaiian Islands  

Science Conference Proceedings (OSTI)

Heavy rainfall and the associated floods occur frequently in the Hawaiian Islands and have caused huge economic losses as well as social problems. Extreme rainfall events in this study are defined by three different methods based on 1) the mean ...

Pao-Shin Chu; Xin Zhao; Ying Ruan; Melodie Grubbs

2009-03-01T23:59:59.000Z

165

A Simple All Weather Model to Estimate Ultraviolet Solar Radiation (290–385 nm)  

Science Conference Proceedings (OSTI)

A new expression to estimate the solar ultraviolet irradiance from parameters usually available in radiometric networks is presented. The authors have analyzed the relation between solar ultraviolet global irradiance (290–385 nm), UV, and ...

I. Foyo-Moreno; J. Vida; L. Alados-Arboledas

1999-07-01T23:59:59.000Z

166

Development and Characterization of a New Solar Ultraviolet-B Irradiance Detector  

Science Conference Proceedings (OSTI)

Characteristics of an instrument for measuring solar ultraviolet-B irradiance are presented together with a description of the instrument. The instrument measures direct and scattered broadband ultraviolet irradiance (wavelengths between 280 and ...

B. K. Dichter; A. F. Beaubien; D. J. Beaubien

1993-06-01T23:59:59.000Z

167

The Effects of Sunshine, Cloudiness and Haze on Received Ultraviolet Radiation in New York  

Science Conference Proceedings (OSTI)

Ultraviolet data from Rochester, Schenectady and Whiteface Mountain, New York, for the period November 1975-December 1977, have been studied to ascertain the importance of extraterrestrial ultraviolet (UV) radiation, sunshine, cloudiness and haze ...

Anita Baker-Blocker

1980-07-01T23:59:59.000Z

168

Jordan Algebras and Extremal Black Holes  

E-Print Network (OSTI)

We review various properties of the exceptional Euclidean Jordan algebra of degree three. Euclidean Jordan algebras of degree three and their corresponding Freudenthal triple systems were recently shown to be intimately related to extremal black holes in N=2, d=4 homogeneous supergravities. Using a novel type of eigenvalue problem with eigenmatrix solutions, we elucidate the rich matrix geometry underlying the exceptional N=2, d=4 homogeneous supergravity and explore the relations to extremal black holes.

Michael Rios

2007-03-27T23:59:59.000Z

169

Electrode configuration for extreme-UV electrical discharge source  

DOE Patents (OSTI)

It has been demonstrated that debris generation within an electric capillary discharge source, for generating extreme ultraviolet and soft x-ray, is dependent on the magnitude and profile of the electric field that is established along the surfaces of the electrodes. An electrode shape that results in uniform electric field strength along its surface has been developed to minimize sputtering and debris generation. The electric discharge plasma source includes: (a) a body that defines a circular capillary bore that has a proximal end and a distal end; (b) a back electrode positioned around and adjacent to the distal end of the capillary bore wherein the back electrode has a channel that is in communication with the distal end and that is defined by a non-uniform inner surface which exhibits a first region which is convex, a second region which is concave, and a third region which is convex wherein the regions are viewed outwardly from the inner surface of the channel that is adjacent the distal end of the capillary bore so that the first region is closest to the distal end; (c) a front electrode positioned around and adjacent to the proximal end of the capillary bore wherein the front electrode has an opening that is communication with the proximal end and that is defined by a non-uniform inner surface which exhibits a first region which is convex, a second region which is substantially linear, and third region which is convex wherein the regions are viewed outwardly from the inner surface of the opening that is adjacent the proximal end of the capillary bore so that the first region is closest to the proximal end; and (d) a source of electric potential that is connected across the front and back electrodes.

Spence, Paul Andrew (Pleasanton, CA); Fornaciari, Neal Robert (Tracey, CA); Chang, Jim Jihchyun (San Ramon, CA)

2002-01-01T23:59:59.000Z

170

Evaluation of a Combined Ultraviolet Photocatalytic Oxidation (UVPCO) /  

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

Evaluation of a Combined Ultraviolet Photocatalytic Oxidation (UVPCO) / Evaluation of a Combined Ultraviolet Photocatalytic Oxidation (UVPCO) / Chemisorbent Air Cleaner for Indoor Air Applications Title Evaluation of a Combined Ultraviolet Photocatalytic Oxidation (UVPCO) / Chemisorbent Air Cleaner for Indoor Air Applications Publication Type Report LBNL Report Number LBNL-62202 Year of Publication 2007 Authors Hodgson, Alfred T., Hugo Destaillats, Toshifumi Hotchi, and William J. Fisk Report Number LBNL-62202 Abstract We previously reported that gas-phase byproducts of incomplete oxidation were generated when a prototype ultraviolet photocatalytic oxidation (UVPCO) air cleaner was operated in the laboratory with indoor-relevant mixtures of VOCs at realistic concentrations. Under these conditions, there was net production of formaldehyde and acetaldehyde, two important indoor air toxicants. Here, we further explore the issue of byproduct generation. Using the same UVPCO air cleaner, we conducted experiments to identify common VOCs that lead to the production of formaldehyde and acetaldehyde and to quantify their production rates. We sought to reduce the production of formaldehyde and acetaldehyde to acceptable levels by employing different chemisorbent scrubbers downstream of the UVPCO device. Additionally, we made preliminary measurements to estimate the capacity and expected lifetime of the chemisorbent media. For most experiments, the system was operated at 680 - 780 m3/h (400 - 460 cfm).

171

Distinguishability of Biological Material Using Ultraviolet Multi-Spectral Fluorescence  

SciTech Connect

Recent interest in the detection and analysis of biological samples by spectroscopic methods has led to questions concerning the degree of distinguishability and biological variability of the ultraviolet (W) fluorescent spectra from such complex samples. We show that the degree of distinguishability of such spectra is readily determined numerically.

Gray, P.C.; Heinen, R.J.; Rigdon, L.D.; Rosenthal, S.E.; Shokair, I.R.; Siragusa, G.R.; Tisone, G.C.; Wagner, J.S.

1998-10-14T23:59:59.000Z

172

Dust and the ultraviolet energy distribution of quasars  

E-Print Network (OSTI)

The ultraviolet energy distribution of quasars shows a sharp steepening of the continuum shortward of 1000 A (rest-frame). We describe how we came to consider the possibility that this continuum break might be the result of absorption by carbon crystallite dust grains.

Luc Binette; Christophe Morisset; Sinhue Haro-Corzo

2005-09-24T23:59:59.000Z

173

Effects of ultra-violet laser irradiation on graphene  

Science Conference Proceedings (OSTI)

Graphene can be applied for transparent electrodes instead of indium tin oxide (ITO). For patterning of ITO, the maskless laser process was reported as a simple and fast process. Raman spectra and electrical resistances of graphene were measured before ... Keywords: Graphene, Maskless laser process, Ultra-violet laser

Fujio Wakaya; Tsuyoshi Teraoka; Toshiya Kisa; Tomoya Manabe; Satoshi Abo; Mikio Takai

2012-09-01T23:59:59.000Z

174

SLAC National Accelerator Laboratory - Sharper Images for Extreme...  

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

Sharper Images for Extreme LCLS Experiments By Glenn Roberts Jr. April 17, 2013 PHOTO: Researchers working with MEC instruments The Matter in Extreme Conditions (MEC) station at...

175

Towards a Risk Analysis Framework for Extreme Weather Impacts on Electric Power Systems  

Science Conference Proceedings (OSTI)

The transmission and distribution planning community has realized that while significantly improved regional climate models and projections are necessary to facilitate meaningful analyses and responses, they may prove well-served by investigative research to increase understanding of potential impacts of changing weather and extreme weather events on relatively vulnerable components of the electricity system. The state of science on extreme weather impacts on the electric power industry is being extended...

2009-12-21T23:59:59.000Z

176

Area spectra of near extremal black holes and Kerr black holes  

E-Print Network (OSTI)

Motivated by Maggiore's new interpretation of quasinormal modes, starting from the first law of thermodynamics of black holes, we investigate area spectra of a near extremal Schwarzschild de sitter black hole and a higher dimensional near extremal Reissner-Nordstrom de sitter black hole. Then we apply the method to the Kerr black hole. We show that the logarithmic term does not appear and the area spectra of all these black holes are equally spaced and irrelevant to the parameters of black holes.

Chen, Deyou; Zu, Xiaotao

2010-01-01T23:59:59.000Z

177

Extreme Scale Computing, Co-design  

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

Extreme Scale Computing, Co-design Extreme Scale Computing, Co-design Informing system design, ensuring productive and efficient code Project Description To address the increasingly complex problems of the modern world, scientists at Los Alamos are pushing the scale of computing to the extreme, forming partnerships with other national laboratories and industry to develop supercomputers that can achieve "exaflop" speeds-that is, a quintillion (a million trillion) calculations per second. To put such speed in perspective, it is equivalent to 50 million laptops all working together at the same time. Researchers are also developing the interacting components of a computational system as a whole. This approach, known as computational co-design, may facilitate revolutionary designs in the next generation of supercomputers.

178

Extreme Computing Software | Argonne National Laboratory  

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

Extreme Computing Software Extreme Computing Software Argonne's Mathematics and Computer Science Division is exploring new approaches to systems software, fault tolerance, and innovative programming models for next-generation computers. Software for extreme computing includes: ADLB (Asynchronous Dynamic Load Balancing) is an MPI-based software library designed to help rapidly build scalable parallel programs. It provides a master/worker system with a put/get API for task descriptions, thus allowing workers to add work dynamically to the system. The library has been used as an execution engine for complicated applications such as Green's function Monte Carlo and higher level "many-task" programming models. Aesop is a high-productivity programming language designed for highly concurent services.

179

Statistics of Extreme Waves in Random Media  

E-Print Network (OSTI)

Waves traveling through random media exhibit random focusing that leads to extremely high wave intensities even in the absence of nonlinearities. Although such extreme events are present in a wide variety of physical systems and the statistics of the highest waves is important for their analysis and forecast, it remains poorly understood in particular in the regime where the waves are highest. We suggest a new approach that greatly simplifies the mathematical analysis and calculate the scaling and the distribution of the highest waves valid for a wide range of parameters.

Jakob J. Metzger; Ragnar Fleischmann; Theo Geisel

2013-11-18T23:59:59.000Z

180

THE FIRST MAXIMUM-LIGHT ULTRAVIOLET THROUGH NEAR-INFRARED SPECTRUM OF A TYPE Ia SUPERNOVA  

Science Conference Proceedings (OSTI)

We present the first maximum-light ultraviolet (UV) through near-infrared (NIR) Type Ia supernova (SN Ia) spectrum. This spectrum of SN 2011iv was obtained nearly simultaneously by the Hubble Space Telescope at UV/optical wavelengths and the Magellan Baade telescope at NIR wavelengths. These data provide the opportunity to examine the entire maximum-light SN Ia spectral energy distribution. Since the UV region of an SN Ia spectrum is extremely sensitive to the composition of the outer layers of the explosion, which are transparent at longer wavelengths, this unprecedented spectrum can provide strong constraints on the composition of the SN ejecta, and similarly the SN explosion and progenitor system. SN 2011iv is spectroscopically normal, but has a relatively fast decline ({Delta}m{sub 15}(B) = 1.69 {+-} 0.05 mag). We compare SN 2011iv to other SNe Ia with UV spectra near maximum light and examine trends between UV spectral properties, light-curve shape, and ejecta velocity. We tentatively find that SNe with similar light-curve shapes but different ejecta velocities have similar UV spectra, while those with similar ejecta velocities but different light-curve shapes have very different UV spectra. Through a comparison with explosion models, we find that both a solar-metallicity W7 and a zero-metallicity delayed-detonation model provide a reasonable fit to the spectrum of SN 2011iv from the UV to the NIR.

Foley, Ryan J.; Marion, G. Howie; Challis, Peter; Kirshner, Robert P.; Berta, Zachory K. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Kromer, Markus; Taubenberger, Stefan; Hillebrandt, Wolfgang; Roepke, Friedrich K.; Ciaraldi-Schoolmann, Franco; Seitenzahl, Ivo R. [Max-Planck-Institut fuer Astrophysik, Karl-Schwarzschild-Strasse 1, D-85748 Garching bei Muenchen (Germany); Pignata, Giuliano [Departamento de Ciencias Fisicas, Universidad Andres Bello, Avda. Republica 252, Santiago (Chile); Stritzinger, Maximilian D. [Department of Physics and Astronomy, Aarhus University, Ny Munkegade, DK-8000 Aarhus C (Denmark); Filippenko, Alexei V.; Li Weidong; Silverman, Jeffrey M. [Department of Astronomy, University of California, Berkeley, CA 94720-3411 (United States); Folatelli, Gaston [Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU, WPI), Todai Institutes for Advanced Study, University of Tokyo, Kashiwa 277-8583 (Japan); Hsiao, Eric Y.; Morrell, Nidia I. [Carnegie Observatories, Las Campanas Observatory, La Serena (Chile); Simcoe, Robert A., E-mail: rfoley@cfa.harvard.edu [MIT-Kavli Institute for Astrophysics and Space Research, 77 Massachusetts Avenue, 37-664D Cambridge, MA 02139 (United States); and others

2012-07-01T23:59:59.000Z

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


181

Technological change: educating for extreme collaboration  

Science Conference Proceedings (OSTI)

This paper considers pedagogical strategies and techniques in design for attaining sustained innovation collaboratively, in order to assist in the New Product Design process and enhance opportunities for creating truly innovative products. The authors ... Keywords: collaborative working, design education, design innovation, design teams, extreme collaboration, multidisciplinary design, technological change

Vasilije Kokotovich; Tom Barker

2010-09-01T23:59:59.000Z

182

CFT Duals for Extreme Black Holes  

E-Print Network (OSTI)

It is argued that the general four-dimensional extremal Kerr-Newman-AdS-dS black hole is holographically dual to a (chiral half of a) two-dimensional CFT, generalizing an argument given recently for the special case of extremal Kerr. Specifically, the asymptotic symmetries of the near-horizon region of the general extremal black hole are shown to be generated by a Virasoro algebra. Semiclassical formulae are derived for the central charge and temperature of the dual CFT as functions of the cosmological constant, Newton's constant and the black hole charges and spin. We then show, assuming the Cardy formula, that the microscopic entropy of the dual CFT precisely reproduces the macroscopic Bekenstein-Hawking area law. This CFT description becomes singular in the extreme Reissner-Nordstrom limit where the black hole has no spin. At this point a second dual CFT description is proposed in which the global part of the U(1) gauge symmetry is promoted to a Virasoro algebra. This second description is also found to re...

Hartman, Thomas; Nishioka, Tatsuma; Strominger, Andrew

2009-01-01T23:59:59.000Z

183

CFT Duals for Extreme Black Holes  

E-Print Network (OSTI)

It is argued that the general four-dimensional extremal Kerr-Newman-AdS-dS black hole is holographically dual to a (chiral half of a) two-dimensional CFT, generalizing an argument given recently for the special case of extremal Kerr. Specifically, the asymptotic symmetries of the near-horizon region of the general extremal black hole are shown to be generated by a Virasoro algebra. Semiclassical formulae are derived for the central charge and temperature of the dual CFT as functions of the cosmological constant, Newton's constant and the black hole charges and spin. We then show, assuming the Cardy formula, that the microscopic entropy of the dual CFT precisely reproduces the macroscopic Bekenstein-Hawking area law. This CFT description becomes singular in the extreme Reissner-Nordstrom limit where the black hole has no spin. At this point a second dual CFT description is proposed in which the global part of the U(1) gauge symmetry is promoted to a Virasoro algebra. This second description is also found to reproduce the area law. Various further generalizations including higher dimensions are discussed.

Thomas Hartman; Keiju Murata; Tatsuma Nishioka; Andrew Strominger

2008-11-26T23:59:59.000Z

184

The Ultraviolet Imaging Telescope: Instrument and Data Characteristics  

E-Print Network (OSTI)

The Ultraviolet Imaging Telescope (UIT) was flown as part of the Astro observatory on the Space Shuttle Columbia in December 1990 and again on the Space Shuttle Endeavor in March 1995. Ultraviolet (1200-3300?A) images of a variety of astronomical objects, with a 40 ? field of view and a resolution of about 3 ? ? , were recorded on photographic film. The data recorded during the first flight are available to the astronomical community through the National Space Science Data Center (NSSDC); the data recorded during the second flight will soon be available as well. This paper discusses in detail the design, operation, data reduction, and calibration of UIT, providing the user of the data with information for understanding and using the data. It also provides guidelines for analyzing other astronomical imagery made with image intensifiers and photographic film. – 3 –

Theodore P. Stecher; Robert H. Cornett; Michael R. Greason; Wayne B. L; Jesse K. Hill; Robert S. Hill; Ralph C. Bohlin; Peter C. Chen; Nicholas R; Michael N. Fanelli; Joan I. Hollis; Susan G. Neff; Robert W. O’connell; Joel D. Offenberg; Ronald A. Parise; Joel Wm. Parker; Morton S. Roberts; M. Smith; William H. Waller

1997-01-01T23:59:59.000Z

185

Inorganic volumetric light source excited by ultraviolet light  

DOE Patents (OSTI)

The invention relates to a composition for the volumetric generation of radiation. The composition comprises a porous substrate loaded with a component capable of emitting radiation upon interaction with an exciting radiation. Preferably, the composition is an aerogel substrate loaded with a component, e.g., a phosphor, capable of interacting with exciting radiation of a first energy, e.g., ultraviolet light, to produce radiation of a second energy, e.g., visible light. 4 figures.

Reed, S.; Walko, R.J.; Ashley, C.S.; Brinker, C.J.

1994-04-26T23:59:59.000Z

186

Durable Corrosion and Ultraviolet-Resistant Silver Mirror  

DOE Patents (OSTI)

A corrosion and ultra violet-resistant silver mirror for use in solar reflectors; the silver layer having a film-forming protective polymer bonded thereto, and a protective shield overlay comprising a transparent multipolymer film that incorporates a UV absorber. The corrosion and ultraviolet resistant silver mirror retains spectral hemispherical reflectance and high optical clarity throughout the UV and visible spectrum when used in solar reflectors.

Jorgensen, G. J.; Gee, R.

2006-01-24T23:59:59.000Z

187

Inorganic volumetric light source excited by ultraviolet light  

DOE Patents (OSTI)

The invention relates to a composition for the volumetric generation of radiation. The composition comprises a porous substrate loaded with a component capable of emitting radiation upon interaction with an exciting radiation. Preferably, the composition is an aerogel substrate loaded with a component, e.g., a phosphor, capable of interacting with exciting radiation of a first energy, e.g., ultraviolet light, to produce radiation of a second energy, e.g., visible light.

Reed, Scott (Albuquerue, NM); Walko, Robert J. (Albuquerue, NM); Ashley, Carol S. (Albuquerue, NM); Brinker, C. Jeffrey (Albuquerue, NM)

1994-01-01T23:59:59.000Z

188

Correction of SOHO CELIAS/SEM EUV Measurements saturated by extreme solar flare events  

E-Print Network (OSTI)

The solar irradiance in the Extreme Ultraviolet (EUV) spectral bands has been observed with a 15 sec cadence by the SOHO Solar EUV Monitor (SEM) since 1995. During remarkably intense solar flares the SEM EUV measurements are saturated in the central (zero) order channel (0.1 -- 50.0 nm) by the flare soft X-ray and EUV flux. The first order EUV channel (26 -- 34 nm) is not saturated by the flare flux because of its limited bandwidth, but it is sensitive to the arrival of Solar Energetic Particles (SEP). While both channels detect nearly equal SEP fluxes, their contributions to the count rate is sensibly negligible in the zero order channel but must be accounted for and removed from the first channel count rate. SEP contribution to the measured SEM signals usually follows the EUV peak for the gradual solar flare events. Correcting the extreme solar flare SEM EUV measurements may reveal currently unclear relations between the flare magnitude, dynamics observed in different EUV spectral bands, and the measured Ea...

Didkovsky, L V; Jones, A R; Wieman, S; Tsurutani, B T; McMullin, D

2006-01-01T23:59:59.000Z

189

Influences of atmospheric conditions and air mass on the ratio of ultraviolet to total solar radiation  

SciTech Connect

The technology to detoxify hazardous wastes using ultraviolet (UV) solar radiation is being investigated by the DOE/SERI Solar Thermal Technology Program. One of the elements of the technology evaluation is the assessment and characterization of UV solar radiation resources available for detoxification processes. This report describes the major atmospheric variables that determine the amount of UV solar radiation at the earth's surface, and how the ratio of UV-to-total solar radiation varies with atmospheric conditions. These ratios are calculated from broadband and spectral solar radiation measurements acquired at SERI, and obtained from the literature on modeled and measured UV solar radiation. The following sections discuss the atmospheric effects on UV solar radiation and provide UV-to-total solar radiation ratios from published studies, as well as measured values from SERI's data. A summary and conclusions are also given.

Riordan, C.J.; Hulstrom, R.L.; Myers, D.R.

1990-08-01T23:59:59.000Z

190

ENSO Influence on Intraseasonal Extreme Rainfall and Temperature Frequencies in the Contiguous United States: Implications for Long-Range Predictability  

Science Conference Proceedings (OSTI)

Potential ENSO-related predictability of wintertime daily extreme precipitation and temperature frequencies is investigated. This is done empirically using six decades of daily data at 168 stations distributed over the contiguous United States. ...

Alexander Gershunov

1998-12-01T23:59:59.000Z

191

LANL | Physics | Hydrodynamic Material Instabilities at extremes  

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

Understanding hydrodynamic material instabilities at extremes Understanding hydrodynamic material instabilities at extremes The National Nuclear Security Administration science-based stockpile stewardship program funds research that will improve critical physics-based dynamic materials models. Los Alamos National Laboratory and Lawrence Livermore National Laboratory, as nuclear weapon design laboratories, are mandated to predict the reliability and durability of the nuclear weapons stockpile. This is done using state-of-the-art supercomputers and computer codes. It is also important to have state-of-the-art physics models in these codes. Los Alamos has theory experts in dynamic materials, thus creating powerful working groups when combined with experimental experts in Physics Division and elsewhere. Key to the science-based stockpile stewardship program is making

192

Chiral gravity, log gravity, and extremal CFT  

Science Conference Proceedings (OSTI)

We show that the linearization of all exact solutions of classical chiral gravity around the AdS{sub 3} vacuum have positive energy. Nonchiral and negative-energy solutions of the linearized equations are infrared divergent at second order, and so are removed from the spectrum. In other words, chirality is confined and the equations of motion have linearization instabilities. We prove that the only stationary, axially symmetric solutions of chiral gravity are BTZ black holes, which have positive energy. It is further shown that classical log gravity--the theory with logarithmically relaxed boundary conditions--has finite asymptotic symmetry generators but is not chiral and hence may be dual at the quantum level to a logarithmic conformal field theories (CFT). Moreover we show that log gravity contains chiral gravity within it as a decoupled charge superselection sector. We formally evaluate the Euclidean sum over geometries of chiral gravity and show that it gives precisely the holomorphic extremal CFT partition function. The modular invariance and integrality of the expansion coefficients of this partition function are consistent with the existence of an exact quantum theory of chiral gravity. We argue that the problem of quantizing chiral gravity is the holographic dual of the problem of constructing an extremal CFT, while quantizing log gravity is dual to the problem of constructing a logarithmic extremal CFT.

Maloney, Alexander [Physics Department, McGill University, Montreal, QC H3A 2T8 (Canada); Song Wei [Key Laboratory of Frontiers in Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, 100190 (China); Center for the Fundamental Laws of Nature Jefferson Physical Laboratory, Harvard University, Cambridge, Massachusetts 02138 (United States); Strominger, Andrew [Center for the Fundamental Laws of Nature Jefferson Physical Laboratory, Harvard University, Cambridge, Massachusetts 02138 (United States)

2010-03-15T23:59:59.000Z

193

Chiral Gravity, Log Gravity and Extremal CFT  

E-Print Network (OSTI)

We show that the linearization of all exact solutions of classical chiral gravity around the AdS3 vacuum have positive energy. Non-chiral and negative-energy solutions of the linearized equations are infrared divergent at second order, and so are removed from the spectrum. In other words, chirality is confined and the equations of motion have linearization instabilities. We prove that the only stationary, axially symmetric solutions of chiral gravity are BTZ black holes, which have positive energy. It is further shown that classical log gravity-- the theory with logarithmically relaxed boundary conditions --has finite asymptotic symmetry generators but is not chiral and hence may be dual at the quantum level to a logarithmic CFT. Moreover we show that log gravity contains chiral gravity within it as a decoupled charge superselection sector. We normally evaluate the Euclidean sum over geometries of chiral gravity and show that it gives precisely the holomorphic extremal CFT partition function. The modular invariance and integrality of the expansion coefficients of this partition function are consistent with the existence of an exact quantum theory of chiral gravity. We argue that the problem of quantizing chiral gravity is the holographic dual of the problem of constructing an extremal CFT, while quantizing log gravity is dual to the problem of constructing a logarithmic extremal CFT.

Alexander Maloney; Wei Song; Andrew Strominger

2009-03-26T23:59:59.000Z

194

Correction of SOHO CELIAS/SEM EUV Measurements saturated by extreme solar flare events  

E-Print Network (OSTI)

The solar irradiance in the Extreme Ultraviolet (EUV) spectral bands has been observed with a 15 sec cadence by the SOHO Solar EUV Monitor (SEM) since 1995. During remarkably intense solar flares the SEM EUV measurements are saturated in the central (zero) order channel (0.1 -- 50.0 nm) by the flare soft X-ray and EUV flux. The first order EUV channel (26 -- 34 nm) is not saturated by the flare flux because of its limited bandwidth, but it is sensitive to the arrival of Solar Energetic Particles (SEP). While both channels detect nearly equal SEP fluxes, their contributions to the count rate is sensibly negligible in the zero order channel but must be accounted for and removed from the first channel count rate. SEP contribution to the measured SEM signals usually follows the EUV peak for the gradual solar flare events. Correcting the extreme solar flare SEM EUV measurements may reveal currently unclear relations between the flare magnitude, dynamics observed in different EUV spectral bands, and the measured Earth atmosphere response. A simple and effective correction technique based on analysis of SEM count-rate profiles, GOES X-ray, and GOES proton data has been developed and used for correcting EUV measurements for the five extreme solar flare events of July 14, 2000, October 28, November 2, November 4, 2003, and January 20, 2005. Although none of the 2000 and 2003 flare peaks were contaminated by the presence of SEPs, the January 20, 2005 SEPs were unusually prompt and contaminated the peak. The estimated accuracy of the correction is about 7.5% for large X-class events.

L. V. Didkovsky; D. L. Judge; A. R. Jones; S. Wieman; B. T. Tsurutani; D. McMullin

2006-10-04T23:59:59.000Z

195

A comparative study of ultraviolet photoconductivity relaxation in zinc oxide (ZnO) thin films deposited by different techniques  

Science Conference Proceedings (OSTI)

Photoresponse characteristics of ZnO thin films deposited by three different techniques namely rf diode sputtering, rf magnetron sputtering, and electrophoretic deposition has been investigated in the metal-semiconductor-metal (MSM) configuration. A significant variation in the crystallinity, surface morphology, and photoresponse characteristics of ZnO thin film with change in growth kinetics suggest that the presence of defect centers and their density govern the photodetector relaxation properties. A relatively low density of traps compared to the true quantum yield is found very crucial for the realization of practical ZnO thin film based ultraviolet (UV) photodetector.

Yadav, Harish Kumar; Gupta, Vinay [Department of Physics and Astrophysics, University of Delhi, Delhi 110 007 (India)

2012-05-15T23:59:59.000Z

196

Method for detection of extremely low concentration  

DOE Patents (OSTI)

An ultratrace detector system for hand-held gas chromatography having high sensitivity, for example, to emissions generated during production of weapons, biological compounds, drugs, etc. The detector system is insensitive to water, air, helium, argon, oxygen, and CO.sub.2. The detector system is basically composed of a hand-held capillary gas chromatography (GC), an insulated heated redox-chamber, a detection chamber, and a vapor trap. For example, the detector system may use gas phase redox reactions and spectral absorption of mercury vapor. The gas chromatograph initially separates compounds that percolate through a bed of heated mercuric oxide (HgO) in a silica--or other metal--aerogel material which acts as an insulator. Compounds easily oxidized by HgO liberate atomic mercury that subsequently pass through a detection chamber which includes a detector cell, such as quartz, that is illuminated with a 254 nm ultra-violet (UV) mercury discharge lamp which generates the exact mercury absorption bands that are used to detect the liberated mercury atoms. Atomic mercury strongly absorbs 254 nm energy is therefore a specific signal for reducing compounds eluting from the capillary GC, whereafter the atomic mercury is trapped for example, in a silicon-aerogel trap.

Andresen, Brian D. (Livermore, CA); Miller, Fred S. (Bethal Island, CA)

2002-01-01T23:59:59.000Z

197

Gamma Ray Burst Constraints on Ultraviolet Lorentz Invariance Violation  

E-Print Network (OSTI)

We present a unified general formalism for ultraviolet Lorentz invariance violation (LV) testing through electromagnetic wave propagation, based on both dispersion and rotation measure data. This allows for a direct comparison of the efficacy of different data to constrain LV. As an example we study the signature of LV on the rotation of the polarization plane of $\\gamma$-rays from gamma ray bursts in a LV model. Here $\\gamma$-ray polarization data can provide a strong constraint on LV, 13 orders of magnitude more restrictive than a potential constraint from the rotation of the cosmic microwave background polarization proposed by Gamboa, L\\'{o}pez-Sarri\\'{o}n, and Polychronakos (2006).

Tina Kahniashvili; Grigol Gogoberidze; Bharat Ratra

2006-07-04T23:59:59.000Z

198

Ultrahigh Energy Neutrals from Extreme Magnetic Flares  

E-Print Network (OSTI)

It is shown that bulk acceleration during reconnection of extremely strong magnetic fields near compact objects can accelerate ions to Lorentz factors of $\\sim 10^2 \\sigma^{3/5}$ under general conditions, where $\\sigma$, the magnetic energy per current-carrying proton rest energy, can approach $10^{15}$. For magnetar-type fields, neutrons and neutrinos can be generated at potentially detectable levels via hadron polarization. Ultrahigh energy photons can also be emitted and escorted from the high field region by Poynting flux.

David Eichler

2003-03-20T23:59:59.000Z

199

A Probability Model for Verifying Deterministic Forecasts of Extreme Events  

Science Conference Proceedings (OSTI)

This article proposes a method for verifying deterministic forecasts of rare, extreme events defined by exceedance above a high threshold. A probability model for the joint distribution of forecasts and observations, and based on extreme-value ...

Christopher A. T. Ferro

2007-10-01T23:59:59.000Z

200

Observed Trends and Changes in Temperature Extremes over Argentina  

Science Conference Proceedings (OSTI)

In this note, changes in temperature extremes over a 40-yr period are analyzed, based on daily minimum and maximum temperatures over Argentina. Trend analysis was performed on seasonal means, standard deviations, and extremes (5th and 95th ...

Matilde Rusticucci; Mariana Barrucand

2004-10-01T23:59:59.000Z

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


201

The Extreme Benchmark Suite : measuring high-performance embedded systems  

E-Print Network (OSTI)

The Extreme Benchmark Suite (XBS) is designed to support performance measurement of highly parallel "extreme" processors, many of which are designed to replace custom hardware implementations. XBS is designed to avoid many ...

Gerding, Steven (Steven Bradley)

2005-01-01T23:59:59.000Z

202

Predicting Extreme Phases of the Indian Summer Monsoon  

Science Conference Proceedings (OSTI)

Extreme active and break phases of the Indian summer monsoon (ISM) often bring about devastating floods and severe draughts. Here it is shown that these extreme phases exhibit distinctive precursory circulation conditions in both the tropics and ...

Qinghua Ding; Bin Wang

2009-01-01T23:59:59.000Z

203

Charged black holes from near extremal black holes  

E-Print Network (OSTI)

We recover the properties of a wide class of far from extremal charged black branes from the properties of near extremal black branes, generalizing the results of Danielsson, Guijosa and Kruczenski.

Gilad Lifschytz

2004-05-06T23:59:59.000Z

204

Climatology Models for Extreme Hurricane Winds near the United States  

Science Conference Proceedings (OSTI)

The rarity of severe coastal hurricanes implies that empirical estimates of extreme wind speed return levels will be unreliable. Here climatology models derived from extreme value theory are estimated using data from the best-track [Hurricane ...

Thomas H. Jagger; James B. Elsner

2006-07-01T23:59:59.000Z

205

Short-Term Climate Extremes: Prediction Skill and Predictability  

Science Conference Proceedings (OSTI)

Forecasts for extremes in short-term climate (monthly means) are examined to understand the current prediction capability and potential predictability. This study focuses on 2-m surface temperature and precipitation extremes over North and South ...

Emily J. Becker; Huug van den Dool; Malaquias Peña

2013-01-01T23:59:59.000Z

206

Impacts of Extreme Weather Events on Transmission and Distribution Systems  

Science Conference Proceedings (OSTI)

Extreme weather encompasses weather phenomena that are especially severe, unseasonal, or at the extremes of historical distributions. Extreme weather events, such as Hurricane Katrina, for example, have resulted in widespread damage to the power infrastructure and caused severe outages, which affected millions of customers. This report discusses the impacts of extreme weather events on power systems and synthesizes utility experiences, lessons learned from different storms occurring around the globe, and...

2010-11-30T23:59:59.000Z

207

High Strength Nickel Alloys for Extreme Oil and Gas Environments  

Science Conference Proceedings (OSTI)

About this Abstract. Meeting, 2013 TMS Annual Meeting & Exhibition. Symposium , Advanced Materials and Reservoir Engineering for Extreme Oil & Gas ...

208

Corrosion of Mild Steel in Extreme Oil and Gas Environments  

Science Conference Proceedings (OSTI)

About this Abstract. Meeting, 2013 TMS Annual Meeting & Exhibition. Symposium , Advanced Materials and Reservoir Engineering for Extreme Oil & Gas ...

209

New Texas wholesale power market weathers extreme cold ...  

U.S. Energy Information Administration (EIA)

... Monthly › Quarterly Coal Report › Monthly Energy Review › Residential Energy ... Solar › Energy in Brief. What's ... major test during the extreme ...

210

The Application of Ultraviolet Germicidal Technology in HVAC Systems  

E-Print Network (OSTI)

One of the most significant issues for today's HVAC (Heating, Ventilation, and Air Conditioning) engineer is Indoor Air Quality (IAQ). Many building owners, operators, and occupants complain of foul odors emanating from HVAC systems. The objectionable odor is the byproduct of the microbial growth (mold and fungus) that accumulates and develops on wet surfaces of HVAC units, causing foul odors to emanate from affected systems and degrading the IAQ and unit performance. This objectionable odor has been appropriately named the "Dirty Sock" syndrome. Less obvious to the building occupants, but of equal importance, are the physical effects the microbial organisms have on HVAC equipment. They restrict the airflow and limit the heat transfer capability, which increases the operating costs of the equipment. Fortunately, IAQ degradation, foul odor, and increased expenses can be eliminated with the installation of the ultraviolet 'C' band (W-C) lamps. The ultraviolet germicidal lamps are designed to kill odor causing mold and fungus that grow in wet evaporator sections of HVAC units. These lamps are installed inside HVAC systems and irradiate areas inhabited by the offending organisms, making it impossible for them to survive. The organisms disappear, the odors disappear, and most importantly, the IAQ complaints disappear. This guide will discuss the microbial growth and IAQ contaminant problems in the HVAC industry, the W-C lamp and other possible solutions, and the benefits of using the HVAC Duty W-C lamp.

Taylor, M. J.

2000-01-01T23:59:59.000Z

211

Ultraviolet Free Electron Laser Facility preliminary design report  

SciTech Connect

This document, the Preliminary Design Report (PDR) for the Brookhaven Ultraviolet Free Electron Laser (UV FEL) facility, describes all the elements of a facility proposed to meet the needs of a research community which requires ultraviolet sources not currently available as laboratory based lasers. Further, for these experiments, the requisite properties are not extant in either the existing second or upcoming third generation synchrotron light sources. This document is the result of our effort at BNL to identify potential users, determine the requirements of their experiments, and to design a facility which can not only satisfy the existing need, but have adequate flexibility for possible future extensions as need dictates and as evolving technology allows. The PDR is comprised of three volumes. In this, the first volume, background for the development of the proposal is given, including descriptions of the UV FEL facility, and representative examples of the science it was designed to perform. Discussion of the limitations and potential directions for growth are also included. A detailed description of the facility design is then provided, which addresses the accelerator, optical, and experimental systems. Information regarding the conventional construction for the facility is contained in an addendum to volume one (IA).

Ben-Zvi, I. [ed.

1993-02-01T23:59:59.000Z

212

Ultraviolet and optical spectroscopy of the R Aquarii symmetrical jet  

Science Conference Proceedings (OSTI)

The first ultraviolet spectrum of the southwest (SW) component of the symmetrical jet in the R Aquarii binary system has been obtained in the range 1200-2000 A with the IUE. These results are compared to more encompassing spectra of the central H II region taken at the same time and also similar spectra of the northeast (NE) jet component obtained six months earlier. Moreover, optical spectra of both the NE and SW jet components in the range 3400-9800 A were obtained within about 6 months and about 1 month, respectively, of the ultraviolet spectra. These highly complementary observations argue that excitation of the symmetrical jet may be due to shock excitation as the jet components overtake and impact the previously ionized material associated with the expanding inner nebulosity. The problems with this shock model as well as problems with competing photoionization models are discussed. It is suggested that the jet components were ejected less than 90 years ago. 28 refs.

Hollis, J.M.; Oliversen, R.J.; Michalitsianos, A.G.; Kafatos, M.; Wagner, R.M. (NASA, Goddard Space Flight Center, Greenbelt, MD (United States) George Mason Univ., Fairfax, VA (United States) Lowell Observatory, Flagstaff, AZ (United States))

1991-08-01T23:59:59.000Z

213

PULSE: Palomar Ultraviolet Laser for the Study of Exoplanets  

E-Print Network (OSTI)

PULSE is a new concept to augment the currently operating 5.1-m Hale PALM-3000 exoplanet adaptive optics system with an ultraviolet Rayleigh laser and associated wavefront sensor. By using an ultraviolet laser to measure the high spatial and temporal order turbulence near the telescope aperture, where it dominates, one can extend the faintness limit of natural guide stars needed by PALM-3000. Initial simulations indicate that very-high infrared contrast ratios and good visible-light adaptive optics performance will be achieved by such an upgraded system on stars as faint as mV = 16-17 using an optimized low-order NGS sensor. This will enable direct imaging searches for, and subsequent characterization of, companions around cool, low-mass stars for the first time, as well as routine visible-light imaging twice as sharp as HST for fainter targets. PULSE will reuse the laser and wavefront sensor technologies developed for the automated Robo-AO laser system currently operating at the Palomar 60-inch telescope, as...

Baranec, Christoph; van Dam, Marcos; Burruss, Rick

2013-01-01T23:59:59.000Z

214

Constructive hidden nodes selection of extreme learning machine for regression  

Science Conference Proceedings (OSTI)

In this paper, we attempt to address the architectural design of ELM regressor by applying a constructive method on the basis of ELM algorithm. After the nonlinearities of ELM network are fixed by randomly generating the parameters, the network will ... Keywords: Constructive method, Error-minimized extreme learning machine, Extreme learning machine, Incremental extreme learning machine

Yuan Lan; Yeng Chai Soh; Guang-Bin Huang

2010-10-01T23:59:59.000Z

215

Dynamics and Prediction of a Mesoscale Extreme Rain Event in the Baiu Front over Kyushu, Japan  

Science Conference Proceedings (OSTI)

A high-resolution version of the limited-area primitive equations model of the Bureau of Meteorology Research Centre is used to investigate the dynamics and prediction of the mesoscale, extreme rain event of 1 August 1993 over Kyushu. The model ...

Noel E. Davidson; Kazuo Kurihara; Teruyuki Kato; Graham Mills; Kamal Puri

1998-06-01T23:59:59.000Z

216

Response of the Summer Marine Layer Flow to an Extreme California Coastal Bend  

Science Conference Proceedings (OSTI)

A summer wind speed maximum extending more than 200 km occurs over water around Point Conception, California, the most extreme bend along the U.S. West Coast. The following several causes were investigated for this wind speed maximum: 1) synoptic ...

Clive E. Dorman; Darko Kora?in

2008-08-01T23:59:59.000Z

217

Estimation of Ultraviolet-A Irradiance from Measurements of 368-nm Spectral Irradiance  

Science Conference Proceedings (OSTI)

The estimation of ultraviolet-A (UV-A) radiation across the earth’s surface is needed to model plant productivity and future impacts of ultraviolet-B radiation on plant productivity. We have developed two models to estimate the UV-A irradiance ...

R. H. Grant; J. R. Slusser

2005-12-01T23:59:59.000Z

218

Ultraviolet electroabsorption modulator based on AlGaN/GaN multiple quantum wells  

E-Print Network (OSTI)

Ultraviolet electroabsorption modulator based on AlGaN/GaN multiple quantum wells I. Friel, C online 20 June 2005 An ultraviolet electroabsorption modulator based on AlGaN/GaN quantum wells is demonstrated. Enhanced excitonic absorption in the quantum wells at around 3.48 eV was achieved using

Moustakas, Theodore

219

Spectral Measurements of Solar Ultraviolet-B Radiation in Southeast England  

Science Conference Proceedings (OSTI)

Spectral measurements of the ultraviolet region of the solar spectrum have been made at Reading, southeast England (51.5°N) since July 1989. The data presented here show the daily and annual variability of and within the ultraviolet-B wave band, ...

Ann R. Webb

1992-02-01T23:59:59.000Z

220

Ultra-violet laser processing of graphene on SiO2/Si  

Science Conference Proceedings (OSTI)

A graphene transparent electrode might be used in industry in the near future instead of indium tin oxide (ITO). For patterning of ITO, the maskless laser process was reported as a simple and fast process. In this paper, effects of ultra-violet laser ... Keywords: Graphene, Maskless laser process, Ultra-violet laser

Fujio Wakaya, Tadashi Kurihara, Satoshi Abo, Mikio Takai

2013-10-01T23:59:59.000Z

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


221

Calculation of Extreme Wave Loads on Coastal Highway Bridges  

E-Print Network (OSTI)

Coastal bridges are exposed to severe wave, current and wind forces during a hurricane. Most coastal bridges are not designed to resist wave loads in such extreme situations, and there are no existing analytical methods to calculate wave loads on coastal highway bridges. This study focuses on developing a new scheme to estimate the extreme wave loads on bridges for designing purpose. In order to do this, a 2D wave velocity potential model (2D Model) is set up for the deterministic analysis of wave force on bridge decks. 2D Model is a linear wave model, which has the capability of calculating wave velocity potential components in time domain based on wave parameters such as wave height, wave period and water depth, and complex structural geometries. 2D Model has Laplace equation as general equation. The free surface boundary, incoming and outgoing wave boundary conditions are linearized, decomposed first, and then solved by the finite difference method. Maximum wave forces results calculated by the linear 2D Model are compared with results from CFD software Flow3D that is using Navier Stokes theory up to the 5th order; and 2D Model is validated by comparing results with experiment data. A case study is conducted for calculating extreme wave forces on I-10 Bridge across Escambia Bay, Florida during Hurricane Ivan in September 2004.SWAN model is adapted to investigate the parameters of wave heights and wave periods around bridge sites. SWAN model has the capability of predicting or hindcasting significant wave heights and wave periods as long as the domain and input parameters are given. The predicted significant wave heights are compared with measurements by Buoy Station 42039 and 42040 nearest to Escambia Bay. A new prediction equation of maximum uplift wave forces on bridge decks is developed in terms of wave height, wave period, water depth, bridge width, water clearance and over top water load. To develop the equations, the relationship is investigated between maximum uplift wave forces and wave parameters, water clearance, green water effects and bridge width. 2D Model is used for up to 1886 cases with difference parameters. Flow3D model is adopted to determine coefficients of water clearance and green water effects, which cannot be calculated by 2D Model.

Meng, Bo

2008-12-01T23:59:59.000Z

222

Analysis of Lipid OxidationChapter 3 Ultraviolet-Visible Spectrophotometry in the Analysis of Lipid Oxidation  

Science Conference Proceedings (OSTI)

Analysis of Lipid Oxidation Chapter 3 Ultraviolet-Visible Spectrophotometry in the Analysis of Lipid Oxidation Methods and Analyses eChapters Methods - Analyses Books Downloadable pdf of Chapter 3 Ultraviolet-Visible

223

Left-Wing Extremism: The Current Threat  

SciTech Connect

Left-wing extremism is ''alive and well'' both in the US and internationally. Although the current domestic terrorist threat within the U. S. is focused on right-wing extremists, left-wing extremists are also active and have several objectives. Leftist extremists also pose an espionage threat to U.S. interests. While the threat to the U.S. government from leftist extremists has decreased in the past decade, it has not disappeared. There are individuals and organizations within the U.S. who maintain the same ideology that resulted in the growth of left-wing terrorism in this country in the 1970s and 1980s. Some of the leaders from that era are still communicating from Cuba with their followers in the U.S., and new leaders and groups are emerging.

Karl A. Seger

2001-04-30T23:59:59.000Z

224

Holography at an Extremal De Sitter Horizon  

E-Print Network (OSTI)

Rotating maximal black holes in four-dimensional de Sitter space, for which the outer event horizon coincides with the cosmological horizon, have an infinite near-horizon region described by the rotating Nariai metric. We show that the asymptotic symmetry group at the spacelike future boundary of the near-horizon region contains a Virasoro algebra with a real, positive central charge. This is evidence that quantum gravity in a rotating Nariai background is dual to a two-dimensional Euclidean conformal field theory. These results are related to the Kerr/CFT correspondence for extremal black holes, but have two key differences: one of the black hole event horizons has been traded for the cosmological horizon, and the near-horizon geometry is a fiber over dS_2 rather than AdS_2.

Dionysios Anninos; Thomas Hartman

2009-10-23T23:59:59.000Z

225

Holography at an Extremal De Sitter Horizon  

E-Print Network (OSTI)

Rotating maximal black holes in four-dimensional de Sitter space, for which the outer event horizon coincides with the cosmological horizon, have an infinite near-horizon region described by the rotating Nariai metric. We show that the asymptotic symmetry group at the spacelike future boundary of the near-horizon region contains a Virasoro algebra with a real, positive central charge. This is evidence that quantum gravity in a rotating Nariai background is dual to a two-dimensional Euclidean conformal field theory. These results are related to the Kerr/CFT correspondence for extremal black holes, but have two key differences: one of the black hole event horizons has been traded for the cosmological horizon, and the near-horizon geometry is a fiber over dS_2 rather than AdS_2.

Anninos, Dionysios

2009-01-01T23:59:59.000Z

226

Extreme overbalance perforating improves well performance  

Science Conference Proceedings (OSTI)

The application of extreme overbalance perforating, by Oryx Energy Co., is consistently outperforming the unpredictable, tubing-conveyed, underbalance perforating method which is generally accepted as the industry standard. Successful results reported from more than 60 Oryx Energy wells, applying this technology, support this claim. Oryx began this project in 1990 to address the less-than-predictable performance of underbalanced perforating. The goal was to improve the initial completion efficiency, translating it into higher profits resulting from earlier product sales. This article presents the concept, mechanics, procedures, potential applications and results of perforating using overpressured well bores. The procedure can also be used in wells with existing perforations if an overpressured surge is used. This article highlights some of the case histories that have used these techniques.

Dees, J.M.; Handren, P.J. [Oryx Energy Co., Dallas, TX (United States)

1994-01-01T23:59:59.000Z

227

A Road Map to Extreme High Vacuum  

DOE Green Energy (OSTI)

Ultimate pressure of a well-designed vacuum system very much depends on pretreatments, processing and the procedures [1,2]. Until now much attention has been paid in minimizing hydrogen outgassing from the chamber material. However, procedures and processing deserves further scrutiny than hitherto given so far. For reducing the gas load, high sensitivity helium leak detection techniques with sensitivities better than 1× 10-12 Torr l/sec need to be used. Effects that are induced by vacuum instrumentation need to be reduced in order to obtain accurate pressure measurements. This presentation will discuss: clean assembly procedures, metal sponges for cryosorption pumping of hydrogen to extreme high vacuum, low cost surface diffusion barriers for reducing the hydrogen gas load, cascade pumping, sensitive helium leak detection techniques and the use of modified extractor and residual gas analyzers. Further, alternative back up pumping systems based on active NEG’s [3] for turbo molecular pumps will be presented.

Ganapati Rao Myneni

2007-06-20T23:59:59.000Z

228

Standoff ultraviolet raman scattering detection of trace levels of explosives.  

Science Conference Proceedings (OSTI)

Ultraviolet (UV) Raman scattering with a 244-nm laser is evaluated for standoff detection of explosive compounds. The measured Raman scattering albedo is incorporated into a performance model that focused on standoff detection of trace levels of explosives. This model shows that detection at {approx}100 m would likely require tens of seconds, discouraging application at such ranges, and prohibiting search-mode detection, while leaving open the possibility of short-range point-and-stare detection. UV Raman spectra are also acquired for a number of anticipated background surfaces: tile, concrete, aluminum, cloth, and two different car paints (black and silver). While these spectra contained features in the same spectral range as those for TNT, we do not observe any spectra similar to that of TNT.

Kulp, Thomas J.; Bisson, Scott E.; Reichardt, Thomas A.

2011-10-01T23:59:59.000Z

229

Extreme Environment Silicon Carbide Hybrid Temperature & Pressure Optical Sensors  

SciTech Connect

This final report contains the main results from a 3-year program to further investigate the merits of SiC-based hybrid sensor designs for extreme environment measurements in gas turbines. The study is divided in three parts. Part 1 studies the material properties of SiC such as temporal response, refractive index change with temperature, and material thermal response reversibility. Sensor data from a combustion rig-test using this SiC sensor technology is analyzed and a robust distributed sensor network design is proposed. Part 2 of the study focuses on introducing redundancy in the sensor signal processing to provide improved temperature measurement robustness. In this regard, two distinct measurement methods emerge. A first method uses laser wavelength sensitivity of the SiC refractive index behavior and a second method that engages the Black-Body (BB) radiation of the SiC package. Part 3 of the program investigates a new way to measure pressure via a distance measurement technique that applies to hot objects including corrosive fluids.

Nabeel Riza

2010-09-01T23:59:59.000Z

230

Method and apparatus for producing durationally short ultraviolet or X-ray laser pulses  

DOE Patents (OSTI)

A method and apparatus is disclosed for producing ultraviolet or X-ray laser pulses of short duration (32). An ultraviolet or X-ray laser pulse of long duration (12) is progressively refracted, across the surface of an opaque barrier (28), by a streaming plasma (22) that is produced by illuminating a solid target (16, 18) with a pulse of conventional line focused high power laser radiation (20). The short pulse of ultraviolet or X-ray laser radiation (32), which may be amplified to high power (40, 42), is separated out by passage through a slit aperture (30) in the opaque barrier (28).

MacGowan, Brian J. (Livermore, CA); Matthews, Dennis L. (El Granada, CA); Trebes, James E. (Livermore, CA)

1988-01-01T23:59:59.000Z

231

Adaptive extremal optimization by detrended fluctuation analysis  

SciTech Connect

Global optimization is one of the key challenges in computational physics as several problems, e.g. protein structure prediction, the low-energy landscape of atomic clusters, detection of community structures in networks, or model-parameter fitting can be formulated as global optimization problems. Extremal optimization (EO) has become in recent years one particular, successful approach to the global optimization problem. As with almost all other global optimization approaches, EO is driven by an internal dynamics that depends crucially on one or more parameters. Recently, the existence of an optimal scheme for this internal parameter of EO was proven, so as to maximize the performance of the algorithm. However, this proof was not constructive, that is, one cannot use it to deduce the optimal parameter itself a priori. In this study we analyze the dynamics of EO for a test problem (spin glasses). Based on the results we propose an online measure of the performance of EO and a way to use this insight to reformulate the EO algorithm in order to construct optimal values of the internal parameter online without any input by the user. This approach will ultimately allow us to make EO parameter free and thus its application in general global optimization problems much more efficient.

Hamacher, K. [Bioinformatics and Theoretical Biology Group, Technical University Darmstadt, Schnittspahnstr. 10, 64287 Darmstadt (Germany)], E-mail: hamacher@bio.tu-darmstadt.de

2007-12-10T23:59:59.000Z

232

Kinetic Simulations of Fusion Energy Dynamics at the Extreme...  

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

Kinetic Simulations of Fusion Energy Dynamics at the Extreme Scale PI Name: William Tang PI Email: tang@pppl.gov Institution: Princeton Plasma Physics Laboratory Allocation...

233

Professor and Director of the Fusion Science Center of Extreme...  

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

Professor and Director of the Fusion Science Center of Extreme States of Matter and Fast Ignition, University of Rochester | National Nuclear Security Administration Our Mission...

234

Climate, extreme heat, and electricity demand in California  

E-Print Network (OSTI)

warming and electricity demand: A study of California.Extreme Heat, and Electricity Demand in California Norman L.high temperature and electricity demand for air-conditioned

Miller, N.L.

2008-01-01T23:59:59.000Z

235

Regularity of the extremal solutions in a Gelfand system problem  

E-Print Network (OSTI)

We examine a Gelfand type system and show the extremal solutions are bounded provided we are close enough to the scalar case.

Cowan, Craig

2010-01-01T23:59:59.000Z

236

Extreme Wind Speed Data Sets: Texas Tech/CSU  

Science Conference Proceedings (OSTI)

... B-indicates a beacon tower exposure. ... 93839 Memphis TN 4 3 1968 123 107 WIND SPEEDS GREATER ... [ SED Home | Extreme Winds Home | Data ...

2013-09-27T23:59:59.000Z

237

ORNL analysis predicts losses from extreme weather damage could...  

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

ORNL analysis predicts losses from extreme weather damage could double by 2050 Researcher tackles unprecedented county-by-county economic loss forecast Research in impacts,...

238

Attributing Changes in the Risk of Extreme Weather and Climate...  

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

many locations around the planet, including the tropics to support analyses of changes in tropical cyclone statistics, as well as extremes of temperature and precipitation. We aim...

239

Special Report: Graphics Processing Units Speed Results in Extreme...  

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

Special Report: Graphics Processing Units Speed Results in Extreme-Scale Supercomputers American Fusion News Category: U.S. Universities Link: Special Report: Graphics Processing...

240

Climate, extreme heat, and electricity demand in California  

E-Print Network (OSTI)

projected extreme heat and peak demand for electricity areadequately kept up with peak demand, and electricity supplytrend in aggregate peak demand in California is expected to

Miller, N.L.

2008-01-01T23:59:59.000Z

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


241

LDRD symposium focuses on materials in extremes, big data, and...  

National Nuclear Security Administration (NNSA)

symposium focuses on materials in extremes, big data, and energy use impacts | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation...

242

Gas flow behavior in extremely low permeability rock  

Science Conference Proceedings (OSTI)

This paper presents a numerical model and modeling study of gas flow through extremely low permeability unconventional reservoirs. In contrast to conventional reservoirs

Yu-Shu Wu; Cong Wang

2012-01-01T23:59:59.000Z

243

Extreme Chromatography: Faster, Hotter, SmallerChapter 3 Chiral Separations  

Science Conference Proceedings (OSTI)

Extreme Chromatography: Faster, Hotter, Smaller Chapter 3 Chiral Separations Methods and Analyses eChapters Methods - Analyses Books Downloadable pdf of Chapter 3 Chiral Separations from ...

244

Preservation of an extreme transient geotherm in the Raft River...  

Open Energy Info (EERE)

transient geotherm in the Raft River detachment shear zone Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Preservation of an extreme transient...

245

Climatological Extremes of Simulated Annual Mean Rainfall  

Science Conference Proceedings (OSTI)

The Commonwealth Scientific and Industrial Research Organisation (CSIRO) Mark 2 global coupled climatic model has been used to generate a 10 000-yr simulation of “present” climate. The resultant dataset has been used to investigate a number of ...

B. G. Hunt

2006-10-01T23:59:59.000Z

246

Action Spectra for Human Skin Cells: Estimates of the Relative Cytotoxicity of the Middle Ultraviolet, Near Ultraviolet, and Violet Regions of Sunlight on  

E-Print Network (OSTI)

Action spectra for the cytotoxic action of electromagnetic radiation in the solar range 280-434 nm have been determined for human fibroblasts and epidermal keratinocytes derived from the same foreskin biopsy. The spectra for the two cell types are close to identical and coincide with our previously published data for a human lymphoblastoid line indicating that the mechanism of inactivation of the three human cell types is similar at any given wavelength. Using published data for ultraviolet transmission of human skin and sample spectral irradiarÃa'data, we have estimated the relative biological effectiveness of the middle ultraviolet (UVB) (290-320 nm), near ultraviolet (UVA) (320-380 nm), and violet (380-434 nm) regions of sunlight for cytotoxicity at the basal layer of the epidermis. We conclude that the UVB component in noon summer sunlight (the most UVB rich spectral conditions tested) may contribute only about 40 % of the total cytotoxic effectiveness of sunlight at 290-

Rex M. Tyrrell; Mireille Pidoux; Cancer Res; Contact The Aacr Publications; Epidermal Keratinocytes; Rex M. Tyrrell; Mireille Pidoux

2013-01-01T23:59:59.000Z

247

Nano-Enabled Titanium Dioxide Ultraviolet Protective Layers for Cool-Color  

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

Nano-Enabled Titanium Dioxide Ultraviolet Nano-Enabled Titanium Dioxide Ultraviolet Protective Layers for Cool-Color Roofing Research Project Nano-Enabled Titanium Dioxide Ultraviolet Protective Layers for Cool-Color Roofing Research Project The Department of Energy (DOE) is currently undertaking research into nano-enabled titanium dioxide (TiO2) ultraviolet (UV) protective layers for cool-color roofing applications. Project Description This project entails optimizing and scaling up silicon dioxide-coated TiO2 nanocrystal synthesis and functionalization in aqueous solution in order to formulate a 10 gallon waterborne clear UV protective nanocomposite coating material. Project Partners This project is being undertaken between DOE and Nanotrons, a Massachusetts-based company that uses nano-engineering technologies to

248

Total Ozone Variations 1970-74 Using Backscattered Ultraviolet (BUV) and Ground-Based Observations  

Science Conference Proceedings (OSTI)

The most long-lived satellite set of ozone observations, to date, is that derived from the Backscatter Ultraviolet (BUV) ozone sensor on Nimbus 4 and extends from April 1970 through 1976. Unfortunately, this experiment suffered spacecraft power ...

A. J. Miller; R. M. Nagatani; T. G. Rogers; A. J. Fleig; D. F. Heath

1982-05-01T23:59:59.000Z

249

Dual-band ultraviolet-short-wavelength infrared imaging via luminescent downshifting with colloidal quantum dots  

E-Print Network (OSTI)

The performance of short-wavelength infrared (SWIR) cameras in the visible and ultraviolet (UV) regions is limited by the absorption of high-energy photons in inactive regions of the imaging array. Dual-band UV-SWIR imaging ...

Geyer, Scott M.

250

Selective absorption of ultraviolet laser energy by human atherosclerotic plaque treated with tetracycline  

Science Conference Proceedings (OSTI)

Tetracycline is an antibiotic that absorbs ultraviolet light at 355 nm and preferentially binds to atherosclerotic plaque both in vitro and in vivo. Tetracycline-treated human cadaveric aorta was compared with untreated aorta using several techniques: absorptive spectrophotometry; and tissue uptake of radiolabeled tetracycline, which showed 4-fold greater uptake by atheroma than by normal vessel. In addition, intravenous tetracycline administered to patients undergoing vascular surgery demonstrated characteristic fluorescence in surgically excised diseased arteries. Because of tetracycline's unique properties, the authors exposed tetracycline-treated and untreated aorta to ultraviolet laser radiation at a wavelength of 355 nm. They found enhanced ablation of tetracycline-treated atheroma compared with untreated atheroma. The plaque ablation caused by ultraviolet laser radiation was twice as extensive in tetracycline-treated vs nontreated plaque. This study demonstrates the potential of tetracycline plaque enhancement for the selective destruction of atheroma by ultraviolet laser radiation.

Murphy-Chutorian, D.; Kosek, J.; Mok, W.; Quay, S.; Huestis, W.; Mehigan, J.; Profitt, D.; Ginsburg, R.

1985-05-01T23:59:59.000Z

251

Study of Possible Ultraviolet Zero of the Beta Function in Gauge Theories with Many Fermions  

E-Print Network (OSTI)

We study the possibility of an ultraviolet (UV) zero in the $n$-loop beta function of U(1) and non-Abelian gauge theories with $N_f$ fermions for large $N_f$. The effect of scheme transformations on the coefficients of different powers of $N_f$ in the $n$-loop term in the beta function is calculated. A general scheme-independent criterion is given for determining whether or not the $n$-loop beta function has a UV zero for large $N_f$. We compare the results with exact integral representations of the leading terms in the beta functions for the respective Abelian and non-Abelian theories in the limit $N_f \\to \\infty$ limit with $N_f \\alpha$ finite. As part of this study, new analytic and numerical results are presented for certain coefficients, denoted $b_{n,n-1}$, that control the large-$N_f$ behavior at $n$-loop order in the beta function. We also investigate various test functions incorporating a power-law and essential UV zero in the beta function and determine their manifestations in series expansions in powers of coupling and in powers of $1/N_f$.

Robert Shrock

2013-11-20T23:59:59.000Z

252

Photon Sciences Worksheet 05-02 Extreme Conditions Extreme Environments Diff.  

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

5-02 Extreme Conditions 5-02 Extreme Conditions Extreme Environments Diff. Resources Available - BE Mid 2012 Mid 2014 Mid 2016 Beamline X-ray Source Total Total Total NSLS 1.16 1.16 0 X17B2 Wiggler 0.33 0.33 0 X17B3 Wiggler 0.33 0.33 0 X17C Wiggler 0.5 0.5 0 APS 5.4 6.1 6.1 3-ID Bend 0 0 0 11-ID-B Undulator 0.1 0.1 0.1 11-ID-C Undulator 0.1 0.1 0.1 13-BM-D a Bend 0.4 0.4 0.4 CAT 13-ID-D a Undulator 0.3 1 1 CAT 16-BM-B b Bend 1 1 1 CAT 16-BM-D b Bend 1 1 1 CAT 16-ID-B b Undulator 1 1 1 CAT 16-ID-D Undulator 1 1 1 CAT 13-BM-C Bend 0.5 0.5 0.5 CAT ALS 1 1 1 12.2.2 Superbend 1 1 1 SSRL 0 0 0 NSLS-II 0 0 0.3 XPD c Dampingwiggler 0 0 0.3 Project Funded and under construction in NSLS-II Project - Available 2015 4DE Wiggler 0 0 0 TEC Undulator 0 0 0 Totals 7.56 8.26 7.4 Diamond Anvil Cell (DAC) only Large Volume Press (LVP) only DAC & LVP BE - Beamline equivalent - 1 BE is a station running the full operating schedule of the facility. Typically 5000 Hrs/yr

253

Odds Ratio Forecasts Increase Precautionary Action for Extreme Weather Events  

Science Conference Proceedings (OSTI)

What is the best way to communicate the risk of rare but extreme weather to the public? One suggestion is to communicate the relative risk of extreme weather in the form of odds ratios; but, to the authors’ knowledge, this suggestion has never ...

Jared LeClerc; Susan Joslyn

2012-10-01T23:59:59.000Z

254

Climate, Extreme Heat, and Electricity Demand in California  

Science Conference Proceedings (OSTI)

Over the twenty-first century, the frequency of extreme-heat events for major cities in heavily air conditioned California is projected to increase rapidly. Extreme heat is defined here as the temperature threshold for the 90th-percentile ...

Norman L. Miller; Katharine Hayhoe; Jiming Jin; Maximilian Auffhammer

2008-06-01T23:59:59.000Z

255

Free Extreme Values Gerard Ben Arous and Dan Virgil Voiculescu  

E-Print Network (OSTI)

Free Extreme Values Gerard Ben Arous and Dan Virgil Voiculescu New York University and University at Berkeley Berkeley, CA 94720-3840 E-mail:dvv@math.berkeley.edu Abstract: Free probability analogues- sification of freely max-stable laws and their domains of attraction, using "free extremal convolutions

Ben Arous, Gérard

256

Regional Analysis of Temperature Extremes: Spatial Analog for Climate Change?  

Science Conference Proceedings (OSTI)

The statistical theory of extreme values is applied to daily minimum and maximum temperature time series in the U.S. Midwest and Southeast. If the spatial pattern in the frequency of extreme temperature events can be explained simply by shifts in ...

Barbara G. Brown; Richard W. Katz

1995-01-01T23:59:59.000Z

257

Studying the Pulsation of Mira Variables in the Ultraviolet  

E-Print Network (OSTI)

We present results from an empirical study of the Mg II h & k emission lines of selected Mira variable stars, using spectra from the International Ultraviolet Explorer (IUE). The stars all exhibit similar Mg II behavior during the course of their pulsation cycles. The Mg II flux always peaks after optical maximum near pulsation phase 0.2-0.5, although the Mg II flux can vary greatly from one cycle to the next. The lines are highly blueshifted, with the magnitude of the blueshift decreasing with phase. The widths of the Mg II lines are also phase-dependent, decreasing from about 70 km/s to 40 km/s between phase 0.2 and 0.6. We also study other UV emission lines apparent in the IUE spectra, most of them Fe II lines. These lines are much narrower and not nearly as blueshifted as the Mg II lines. They exhibit the same phase-dependent flux behavior as Mg II, but they do not show similar velocity or width variations.

Brian E. Wood; Margarita Karovska

2000-02-14T23:59:59.000Z

258

Aluminum complexation by catechol as determined by ultraviolet spectrophotometry  

Science Conference Proceedings (OSTI)

Methods of ultraviolet (UV) spectrophotometry were used to determine the stoichiometry and association constant for the Al-catechol complex from pH 3.8 to 4.6. Job's method of continuous variation indicated the Al-catechol complex had a 1:1 stoichiometry in the pH range studied. Aluminum titrations of catechol and pH titrations of catechol plus Al resulted in a shift in the UV spectra due to the formation of an Al-catechol complex absorbing UV radiation uniquely different than that of free catechol. General equations were developed for the determination of association constants assuming an organic and Al-organic complex absorb UV radiation. Aluminum titrations with constant catechol concentration yielded a log k/sub 0.1//sup c/ of 16.22 for a 1:1 Al-catechol complex. Calculated absorbance as a function of pH agree dwell with experimental pH titrations of solutions containing catechol plus Al. The fact that Al can be complexed by catechol at low pH indicates the o-hydroxy group provides a potential source for Al complexation in soil and surface waters.

Sikora, F.J.; McBride, M.B.

1989-03-01T23:59:59.000Z

259

Ultraviolet reflector materials for solar detoxification of hazardous waste  

DOE Green Energy (OSTI)

Organic waste detoxification requires cleavage of carbon bonds. Such reactions can be photo-driven by light that is energetic enough to disrupt such bonds. Alternately, light can be used to activate catalyst materials, which in turn can break organic bonds. In either case, photons with wavelengths less than 400 nm are required. Because the terrestrial solar resource below 400 nm is so small (roughly 3% of the available spectrum), highly efficient optical concentrators are needed that can withstand outdoor service conditions. In the past, optical elements for solar application have been designed to prevent ultraviolet (uv) radiation from reaching the reflective layer to avoid the potentially harmful effects of such light on the collector materials themselves. This effectively forfeits the uv part of the spectrum in return for some measure of protection against optical degradation. To optimize the cost/performance benefit of photochemical reaction systems, optical materials must be developed that are not only highly efficient but also inherently stable against the radiation they are designed to concentrate. The requirements of uv optical elements in terms of appropriate spectral bands and level of reflectance are established based upon the needs of photochemical applications. Relevant literature on uv reflector materials is reviewed which, along with discussions with industrial contacts, allows the establishment of a data base of currently available materials. Although a number of related technologies exist that require uv reflectors, to date little attention has been paid to achieving outdoor durability required for solar applications. 49 refs., 3 figs.

Jorgensen, G.; Govindarajan, R.

1991-07-01T23:59:59.000Z

260

Intraseasonal and Interannual Variability of Extreme Dry and Wet Events over Southeastern South America and the Subtropical Atlantic during Austral Summer  

Science Conference Proceedings (OSTI)

Intraseasonal and interannual variability of extreme wet and dry anomalies over southeastern Brazil and the western subtropical South Atlantic Ocean are investigated. Precipitation data are obtained from the Global Precipitation Climatology ...

Michel N. Muza; Leila M. V. Carvalho; Charles Jones; Brant Liebmann

2009-04-01T23:59:59.000Z

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


261

Extreme ultraviolet and soft x-ray diagnostics of high-temperature plasmas. Annual progress report, June 1, 1975--May 31, 1976  

SciTech Connect

The report discusses the four major research areas of this program: diagnostic studies of CTR plasmas, laboratory spectroscopy and calibration at short wavelengths, theoretical computation of transition probabilities for highly ionized atoms, and instrument development for short wavelength studies of CTR devices. Using existing instruments, diagnostic studies are under way at Versator and Elmo Bumpy Torus. A facility has been completed for the sensitivity calibration of spectrometers down to 300 A as complete units. The development of computer programs necessary for transition probability calculations is ninety percent complete. An f/20 forty cm focal length concave grating spectrometer has been constructed utilizing very high vacuum techniques to reduce contamination of plasma devices and calibration sources such as SURF II at NBS. New designs for grazing incidence monochromators have been developed.

Moos, H.W.; Armstrong, L. Jr.; Fastie, W.G.

1976-01-01T23:59:59.000Z

262

Dynamics and manipulation of the dominant 13.5 nm in-band extreme ultraviolet emitting region of laser-produced Sn plasmas  

E-Print Network (OSTI)

2008 Master of Science, Electrical and Computer Engineering,Bachelor of Science, Electrical and Computer Engineering,

Yuspeh, Samuel Edward

2011-01-01T23:59:59.000Z

263

Extreme Associated Functions: Optimally Linking Local Extremes to Large-scale Atmospheric Circulation Structures  

E-Print Network (OSTI)

We present a new statistical method to optimally link local weather extremes to large-scale atmospheric circulation structures. The method is illustrated using July-August daily mean temperature at 2m height (T2m) time-series over the Netherlands and 500 hPa geopotential height (Z500) time-series over the Euroatlantic region of the ECMWF reanalysis dataset (ERA40). The method identifies patterns in the Z500 time-series that optimally describe, in a precise mathematical sense, the relationship with local warm extremes in the Netherlands. Two patterns are identified; the most important one corresponds to a blocking high pressure system leading to subsidence and calm, dry and sunny conditions over the Netherlands. The second one corresponds to a rare, easterly flow regime bringing warm, dry air into the region. The patterns are robust; they are also identified in shorter subsamples of the total dataset. The method is generally applicable and might prove useful in evaluating the performance of climate models in s...

Panja, Debabrata

2007-01-01T23:59:59.000Z

264

Mesoscale predictability of an extreme warm-season precipitation event  

E-Print Network (OSTI)

During the period of June 29 through July 6, 2002, an extreme precipitation event occurred over Texas, resulting in catastrophic flooding. Operational forecasts performed poorly, neither predicting the copious amounts of rain nor its longevity. The Penn State University/NCAR Mesoscale Model version 5 (MM5) was used to conduct predictability experiments, which follow closely to the research conducted by Zhang et al. A control simulation initialized at 00Z 1 July is established over a 30-km grid. First, practical predictability experiments are performed by exploring the impacts due to different lead-times, resolution dependence, and different physics parameterizations. Second, intrinsic predictability is investigated by inducing a random temperature perturbation in the initial conditions, followed by numerous simulations with various perturbed initializations. Similar results to those found by Zhang et al. were discovered here: the prominent initial error growth is associated with moist processes leading to convection. Eventually these errors grow from the convective scale to sub-synoptic scale, essentially below 1000 kilometers. This indicates that as the forecast time extends further beyond initialization, the resulting errors will impact forecasts of larger-scale features such as differences in the positioning and intensity of positive PV anomalies and distribution of precipitation from the control simulation.

Odins, Andrew Michael

2004-12-01T23:59:59.000Z

265

Chemistry of H2O and HF Under Extreme Conditions  

DOE Green Energy (OSTI)

The predicted high pressure superionic phases of water and HF are investigated via ab initio molecular dynamics. These phases could potentially be achieved through either static compression with heating or through shock compression. We study water at densities of 2.0-3.0 g/cc (34-115 GPa) along the 2000K isotherm.We find that extremely rapid (superionic) diffusion of protons occurs in a fluid phase at pressures between 34 and 58 GPa. A transition to a stable body-centered cubic (bcc) O lattice with superionic proton conductivity is observed between 70 and 75 GPa, a much higher pressure than suggested in prior work. We find that all molecular species at pressures greater than 75 GPa are too short lived to be classified as bound states. Up to 95 GPa, we find a solid superionic phase characterized by covalent O-H bonding. Above 95 GPa, a transient network phase is found characterized by symmetric O-H hydrogen bonding with nearly 50% covalent character. Ab initio molecular dynamics simulations of HF were conducted at densities of 1.8-4.0 g/cc along the 900 K isotherm. According to our simulations, a unique form of (symmetric) hydrogen bonding could play a significant role in superionic conduction. Our work shows that superionic phases could be more prevalent in hydrogen bonded systems than previously thought, such as HCl and HBr.

Fried, L; Goldman, N; Kuo, I W; Mundy, C

2005-11-28T23:59:59.000Z

266

Revisiting the Statewide Climate Extremes for the United States: Evaluating Existing Extremes, Archived Data, and New Observations  

Science Conference Proceedings (OSTI)

New all-time extreme climate records have been set in several states over the past few years. These records highlighted a need to review the existing statewide climate extremes tables maintained by the NOAA National Climatic Data Center (NCDC). Also, ...

Karsten A. Shein; Dennis P. Todey; F. Adnan Akyuz; James R. Angel; Timothy M. Kearns; James L. Zdrojewski

2013-03-01T23:59:59.000Z

267

Effect of electron energy distribution functions on plasma generated vacuum ultraviolet in a diffusion plasma excited by a microwave surface wave  

Science Conference Proceedings (OSTI)

Plasma generated vacuum ultraviolet (VUV) in diffusion plasma excited by a microwave surface wave has been studied by using dielectric-based VUV sensors. Evolution of plasma VUV in the diffusion plasma as a function of the distance from the power coupling surface is investigated. Experimental results have indicated that the energy and spatial distributions of plasma VUV are mainly controlled by the energy distribution functions of the plasma electrons, i.e., electron energy distribution functions (EEDFs). The study implies that by designing EEDF of plasma, one could be able to tailor plasma VUV in different applications such as in dielectric etching or photo resist smoothing.

Zhao, J. P.; Chen, L.; Funk, M.; Sundararajan, R. [Austin Plasma Laboratory, Tokyo Electron America, Inc., Austin, Texas 78741 (United States); Nozawa, T. [Tokyo Electron Limited, TEL Technology Center Sendai, 2-1 Osawa 3-chome, Izumi-ku, Sendai 981-3137 (Japan); Samukawa, S. [Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577 (Japan)

2013-07-15T23:59:59.000Z

268

Former Assistant Secretary Shares Experiences Leading EM: 'Extremely  

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

'Extremely Rewarding' Former Assistant Secretary Shares Experiences Leading EM: 'Extremely Rewarding' September 30, 2013 - 10:25am Addthis Dr. Inés Triay said serving as EM Assistant Secretary was challenging and extremely rewarding. Dr. Inés Triay said serving as EM Assistant Secretary was challenging and extremely rewarding. In an occasional EM Update series, we feature interviews with former EM Assistant Secretaries to reflect on their achievements and challenges in the Cold War cleanup and to discuss endeavors in life after EM. Before serving as EM's Assistant Secretary in 2009 - leading the largest, most diverse and most technically complex environmental cleanup program in the world - Dr. Inés Triay was the cleanup program's Principal Deputy Assistant Secretary, Chief Operations Officer, Deputy

269

'Extreme Makeover: Home Edition' Builds Efficiently | Department of Energy  

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

'Extreme Makeover: Home Edition' Builds Efficiently 'Extreme Makeover: Home Edition' Builds Efficiently 'Extreme Makeover: Home Edition' Builds Efficiently February 12, 2010 - 9:30am Addthis Joshua DeLung You may recall this post on Energy Empowers, which previewed an upcoming episode of ABC's "Extreme Makeover: Home Edition" where the U.S. Department of Energy collaborated with builders to incorporate energy-efficiency and renewable energy technologies at The Fishing School, one of two such collaborative projects in an episode that was set to air during a special 2010 Valentine's Day episode, featuring filmmaker Tyler Perry as a guest. The episode aired and told the story of energy efficiency changing the lives of some very special mentors and of America's youth. Additionally, Clean Skies News covered the builds. Here's its first video

270

Extreme thermophiles: moving beyond single-enzyme biocatalysis  

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

COCHE-51; NO. OF PAGES 10 COCHE-51; NO. OF PAGES 10 Please cite this article in press as: Frock AD, Kelly RM. Extreme thermophiles: moving beyond single-enzyme biocatalysis, Curr Opin Chem Eng (2012), http://dx.doi.org/10.1016/ j.coche.2012.07.003 Available online at www.sciencedirect.com Extreme thermophiles: moving beyond single-enzyme biocatalysis Andrew D Frock and Robert M Kelly Extremely thermophilic microorganisms have been sources of thermostable and thermoactive enzymes for over 30 years. However, information and insights gained from genome sequences, in conjunction with new tools for molecular genetics, have opened up exciting new possibilities for biotechnological opportunities based on extreme thermophiles that go beyond single-step biotransformations. Although the pace for discovering novel microorganisms has slowed over

271

Atomistic simulations of chemomechanical processes in nanomaterials under extreme environments  

E-Print Network (OSTI)

The complex chemomechanical behavior of nanomaterials under extreme thermal and mechanical environments is of interest for a range of basic science and defense applications. By the limitation of experimental approaches for ...

Cho, Hansohl

2009-01-01T23:59:59.000Z

272

The 1993 Midwest Extreme Precipitation in Historical and Probabilistic Perspective  

Science Conference Proceedings (OSTI)

Extreme rainfall amounts that resulted in severe flooding during the spring and summer of 1993 along the Missouri and Mississippi Rivers are examined from a historical and probabilistic viewpoint. Long-term average precipitation amounts and the ...

Nathaniel B. Guttman; J. R. M. Hosking; James R. Wallis

1994-10-01T23:59:59.000Z

273

SUMMARY OF REVISED TORNADO, HURRICANE AND EXTREME STRAIGHT WIND...  

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

@ E A R T H L I N K . N E T SUMMARY OF REVISED TORNADO, HURRICANE AND EXTREME STRAIGHT WIND CHARACTERISTICS AT NUCLEAR FACILITY SITES Categorization of Natural Hazard Phenomenon...

274

A Homogenized Historical Temperature Extreme Dataset for the United States  

Science Conference Proceedings (OSTI)

A subset of stations from the daily U.S. Historical Climatology Network (HCN) is used as a basis for a historical database of temperature extreme occurrence in the United States. The dataset focuses on daily temperature occurrences that exceed (...

Arthur T. DeGaetano; Robert J. Allen; Kevin P. Gallo

2002-09-01T23:59:59.000Z

275

Multimodel Detection and Attribution of Extreme Temperature Changes  

Science Conference Proceedings (OSTI)

Recent studies have detected anthropogenic influences due to increases in greenhouse gases on extreme temperature changes during the latter half of the 20th century at global and regional scales. Most of the studies, however, were based on a ...

Seung-Ki Min; Xuebin Zhang; Francis Zwiers; Hideo Shiogama; Yu-Shiang Tung; Michael Wehner

276

Characterizing and Modeling Temporal and Spatial Trends in Rainfall Extremes  

Science Conference Proceedings (OSTI)

A hierarchical spatial model for daily rainfall extremes that characterizes their temporal variation due to interannual climatic forcing as well as their spatial pattern is proposed. The model treats the parameters of at-site probability ...

Santosh K. Aryal; Bryson C. Bates; Edward P. Campbell; Yun Li; Mark J. Palmer; Neil R. Viney

2009-02-01T23:59:59.000Z

277

Monitoring and Understanding Trends in Extreme Storms: State of Knowledge  

Science Conference Proceedings (OSTI)

The state of knowledge regarding trends and an understanding of their causes is presented for a specific subset of extreme weather and climate types. For severe convective storms (tornadoes, hailstorms, and severe thunderstorms), differences in time and ...

Kenneth E. Kunkel; Thomas R. Karl; Harold Brooks; James Kossin; Jay H. Lawrimore; Derek Arndt; Lance Bosart; David Changnon; Susan L. Cutter; Nolan Doesken; Kerry Emanuel; Pavel Ya. Groisman; Richard W. Katz; Thomas Knutson; James O'Brien; Christopher J. Paciorek; Thomas C. Peterson; Kelly Redmond; David Robinson; Jeff Trapp; Russell Vose; Scott Weaver; Michael Wehner; Klaus Wolter; Donald Wuebbles

2013-04-01T23:59:59.000Z

278

Long-Term Statistics and Extreme Waves of Sea Storms  

Science Conference Proceedings (OSTI)

A stochastic model of sea storms for describing long-term statistics of extreme wave events is presented. The formulation generalizes Boccotti’s equivalent triangular storm model by describing an actual storm history in the form of a generic ...

Francesco Fedele; Felice Arena

2010-05-01T23:59:59.000Z

279

Geocomputation's future at the extremes: high performance computing and nanoclients  

E-Print Network (OSTI)

Geocomputation's future at the extremes: high performance computing and nanoclients K.C. Clarke; High performance computing; Tractability; Geocom- putation E-mail address: kclarke@geog.ucsb.edu (K

Clarke, Keith

280

Explaining Extreme Events of 2011 from a Climate Perspective  

Science Conference Proceedings (OSTI)

Attribution of extreme events shortly after their occurrence stretches the current state-of-theart of climate change assessment. To help foster the growth of this science, this article illustrates some approaches to answering questions about the role of ...

Thomas C. Peterson; Peter A. Stott; Stephanie Herring

2012-07-01T23:59:59.000Z

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


281

Regional Extreme Monthly Precipitation Simulated by NARCCAP RCMs  

Science Conference Proceedings (OSTI)

This paper analyzes the ability of the North American Regional Climate Change Assessment Program (NARCCAP) ensemble of regional climate models to simulate extreme monthly precipitation and its supporting circulation for regions of North America, ...

William J. Gutowski Jr.; Raymond W. Arritt; Sho Kawazoe; David M. Flory; Eugene S. Takle; Sébastien Biner; Daniel Caya; Richard G. Jones; René Laprise; L. Ruby Leung; Linda O. Mearns; Wilfran Moufouma-Okia; Ana M. B. Nunes; Yun Qian; John O. Roads; Lisa C. Sloan; Mark A. Snyder

2010-12-01T23:59:59.000Z

282

A Climatological Measure of Extreme Snowdrift Loading on Building Roofs  

Science Conference Proceedings (OSTI)

A physical model of snow transport and deposition is used in combination with historical climatological data to derive a climatological measure of extreme snowdrift loads on building roofs. The snowdrift metric used relies on hourly wind speed, ...

Arthur T. DeGaetano; Michael J. O'Rourke

2004-01-01T23:59:59.000Z

283

Global Estimates of Extreme Wind Speed and Wave Height  

Science Conference Proceedings (OSTI)

A long-term dataset of satellite altimeter measurements of significant wave height and wind speed, spanning 23 years, is analyzed to determine extreme values corresponding to a 100-yr return period. The analysis considers the suitability of both ...

J. Vinoth; I. R. Young

2011-03-01T23:59:59.000Z

284

Observations of Gamma-Ray Bursts at Extreme Energies  

E-Print Network (OSTI)

of Gamma-Ray Bursts . . . . . . . . . . . . . Redshift-CRUZ OBSERVATIONS OF GAMMA-RAY BURSTS AT EXTREME ENERGIES ADedication xix Acknowledgments xx 1 Gamma-Ray Bursts 1.1

Aune, Taylor

2012-01-01T23:59:59.000Z

285

Extreme Flood Response: The June 2008 Flooding in Iowa  

Science Conference Proceedings (OSTI)

We examine the hydroclimatology, hydrometeorology and hydrology of extreme floods through analyses that center on the June 2008 flooding in Iowa. The most striking feature of the June 2008 flooding was the flood peak of the Cedar River at Cedar ...

James A. Smith; Mary Lynn Baeck; Gabriele Villarini; Daniel B. Wright; Witold Krajewski

286

Canadian RCM Projected Changes to Extreme Precipitation Characteristics over Canada  

Science Conference Proceedings (OSTI)

Changes to the intensity and frequency of hydroclimatic extremes can have significant impacts on sectors associated with water resources, and therefore it is relevant to assess their vulnerabilities in a changing climate. This study focuses on the ...

B. Mladjic; L. Sushama; M. N. Khaliq; R. Laprise; D. Caya; R. Roy

2011-05-01T23:59:59.000Z

287

Self-force on extreme mass ratio inspirals via curved spacetime effective field theory  

E-Print Network (OSTI)

In this series we construct an effective field theory (EFT) in curved spacetime to study gravitational radiation and backreaction effects. We begin in this paper with a derivation of the self-force on a compact object moving in the background spacetime of a supermassive black hole. The EFT approach utilizes the disparity between two length scales, which in this problem are the size of the compact object and the radius of curvature of the background spacetime, to treat the orbital dynamics of the compact object, described as an effective point particle, separately from its tidal deformations. Ultraviolet divergences are regularized using Hadamard's {\\it partie finie} to isolate the non-local finite part from the quasi-local divergent part. The latter is constructed from a momentum space representation for the graviton retarded propagator and is evaluated using dimensional regularization in which only logarithmic divergences are relevant for renormalizing the parameters of the theory. As a first important application of this framework we explicitly derive the first order self-force given by Mino, Sasaki, Tanaka, Quinn and Wald. Going beyond the point particle approximation, to account for the finite size of the object, we demonstrate that for extreme mass ratio inspirals the motion of a compact object is affected by tidally induced moments at $O(\\epsilon^4)$, in the form of an Effacement Principle. The relatively large radius-to-mass ratio of a white dwarf star allows for these effects to be enhanced until the white dwarf becomes tidally disrupted, a potentially $O(\\epsilon^2)$ process, or plunges into the supermassive black hole. This work provides a new foundation for further exploration of higher order self force corrections, gravitational radiation and spinning compact objects.

Chad R. Galley; B. L. Hu

2008-01-07T23:59:59.000Z

288

The development of an index for the proximal upper extremity  

E-Print Network (OSTI)

Analysis techniques specific to the proximal upper extremity have historically been overlooked in the field of ergonomics. This research effort provides a methodology that will allow the ergonomics practitioner to analyze a job and predict whether or not that job exposes workers to increased risk of proximal upper extremity disorders. Literature from the fields of physiology, biomechanics, and epidemiology was assimilated in order to understand the theories of pathogenesis of disorders in the rotator cuff and to identify the risk factors associated with proximal upper extremity disorders. A retrospective epidemiological study was conducted to identify job task variables that may contribute to the occurrence of proximal upper extremity disorders. Two proximal upper extremity constructs were proposed: a fatigue-based model and a compressive load-based model. The constructs incorporated lessons learned from the literature and results from the epidemiological study. Validation of the models was performed using data from the epidemiological study. It was determined that the fatigue-based model was a good predictor of proximal upper extremity disorders.

Walline, Erin Kurusz

2003-05-01T23:59:59.000Z

289

An Extreme Cold-Air Outbreak over the Labrador Sea: Roll Vortices and Air–Sea Interaction  

Science Conference Proceedings (OSTI)

Observational data from two research aircraft flights are presented. The flights were planned to investigate the air–sea interaction during an extreme cold-air outbreak, associated with the passage of a synoptic-scale low pressure system over the ...

Ian A. Renfrew; G. W. K. Moore

1999-10-01T23:59:59.000Z

290

On the role of the Jeffreys'sheltering mechanism in the sustain of extreme water waves  

E-Print Network (OSTI)

The effect of the wind on the sustain of extreme water waves is investigated experimentally and numerically. A series of experiments conducted in the Large Air-Sea Interactions Facility (LASIF) showed that a wind blowing over a strongly nonlinear short wave group due to the linear focusing of a modulated wave train may increase the life time of the extreme wave event. The expriments suggested that the air flow separation that occurs on the leeward side of the steep crests may sustain longer the maximum of modulation of the focusing-defocusing cycle. Based on a Boundary-Integral Equation Method and a pressure distribution over the steep crests given by the Jeffreys'sheltering theory, similar numerical simulations have confirmed the experimental results

Giovanangeli, J P; Touboul, J; Giovanangeli, Jean-Paul; Kharif, Christian; Touboul, Julien

2006-01-01T23:59:59.000Z

291

Mapping the Hazard of Extreme Rainfall by Peaks over Threshold Extreme Value Analysis and Spatial Regression Techniques  

Science Conference Proceedings (OSTI)

The occurrence of rainfalls of high magnitude constitutes a primary natural hazard in many parts of the world, and the elaboration of maps showing the hazard of extreme rainfalls has great theoretical and practical interest. In this work a ...

Santiago Beguería; Sergio M. Vicente-Serrano

2006-01-01T23:59:59.000Z

292

Ultraviolet - "Green" Energy in the "C" Band  

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

Ultraviolet - "Green" Energy in the "C" Band Ultraviolet - "Green" Energy in the "C" Band Speaker(s): Forrest Fencl Date: April 16, 2009 - 12:00pm Location: 90-3122 Mr. Forrest Fencl of UV Resources, Inc. will discuss how air conditioning system operation, maintenance, and utilization influence system cooling capacity and indoor air quality. The use of ultraviolet germicidal radiation to clean heat exchangers and maintain their efficiency will be reviewed and energy savings estimates will be provided. Additionally, he will discuss why UV-C is considered the "green" cleaner and how widely it is used today as an engineering strategy for precluding the growth, dissemination and recirculation of microbial contaminants. For more information about this seminar, please contact: Bill Fisk(510) 486-591

293

Evaluation of Ultra-Violet Photocatalytic Oxidation (UVPCO) for...  

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

165 and 580 m3h. Production of formaldehyde, acetaldehyde, acetone, formic acid, and acetic acid as reaction products was investigated. Conversion efficiency data were...

294

The Role of Human Activity in the Recent Warming of Extremely Warm Daytime Temperatures  

Science Conference Proceedings (OSTI)

Formal detection and attribution analyses of changes in daily extremes give evidence of a significant human influence on the increasing severity of extremely warm nights and decreasing severity of extremely cold days and nights. This paper ...

Nikolaos Christidis; Peter A. Stott; Simon J. Brown

2011-04-01T23:59:59.000Z

295

Predicted 21st century changes in seasonal extreme precipitation events in the parallel climate model  

E-Print Network (OSTI)

series suitable for extreme event analysis at climate modelother forms of extreme event analysis are not enabled byThe study of extreme events is the analysis of the tails of

Wehner, Michael F.

2004-01-01T23:59:59.000Z

296

Observed Changes in Return Values of Annual Temperature Extremes over Argentina  

Science Conference Proceedings (OSTI)

Extreme temperature events are one of the most studied extreme events since their occurrence has a huge impact on society. In this study, the frequency of occurrence of absolute extreme temperature events in Argentina is analyzed. Four annual ...

Matilde Rusticucci; Bárbara Tencer

2008-11-01T23:59:59.000Z

297

Supercomputers: Extreme Computing at the National Labs | Department of  

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

Supercomputers: Extreme Computing at the National Labs Supercomputers: Extreme Computing at the National Labs Supercomputers: Extreme Computing at the National Labs September 4, 2013 - 1:08pm Addthis Titan 1 of 5 Titan Oak Ridge National Laboratory's Titan has a theoretical peak performance of more than 20 petaflops, or more than 20 quadrillion calculations per second. This will enable researchers across the scientific arena, from materials to climate change to astrophysics, to acquire unparalleled accuracy in their simulations and achieve research breakthroughs more rapidly than ever before. Titan is currently the second fastest supercomputer in the world. Image: Courtesy of Oak Ridge National Laboratory. Sequoia 2 of 5 Sequoia Sequoia is a 20 petaflop, that is 20 quadrillion floating point operations per second, IBM BlueGene/Q system at Lawrence Livermore National

298

Intensification of hot extremes in the United States  

SciTech Connect

Governments are currently considering policies that will limit greenhouse gas concentrations, including negotiation of an international treaty to replace the expiring Kyoto Protocol. Existing mitigation targets have arisen primarily from political negotiations, and the ability of such policies to avoid dangerous impacts is still uncertain. Using a large suite of climate model experiments, we find that substantial intensification of hot extremes could occur within the next 3 decades, below the 2 C global warming target currently being considered by policy makers. We also find that the intensification of hot extremes is associated with a shift towards more anticyclonic atmospheric circulation during the warm season, along with warm-season drying over much of the U.S. The possibility that intensification of hot extremes could result from relatively small increases in greenhouse gas concentrations suggests that constraining global warming to 2 C may not be sufficient to avoid dangerous climate change.

Diffenbaugh, Noah [Stanford University; Ashfaq, Moetasim [ORNL

2010-01-01T23:59:59.000Z

299

Controllable Gaussian-qubit interface for extremal quantum state engineering  

E-Print Network (OSTI)

We study state engineering through bilinear interactions between two remote qubits and two-mode Gaussian light fields. The attainable two-qubit states span the entire physically allowed region in the entanglement-versus-global-purity plane. Two-mode Gaussian states with maximal entanglement at fixed global and marginal entropies produce maximally entangled two-qubit states in the corresponding entropic diagram. We show that a small set of parameters characterizing extremally entangled two-mode Gaussian states is sufficient to control the engineering of extremally entangled two-qubit states, which can be realized in realistic matter-light scenarios.

G. Adesso; S. Campbell; F. Illuminati; M. Paternostro

2010-03-11T23:59:59.000Z

300

Extreme high-head portables provide more pumping options  

SciTech Connect

Three years ago, Godwin Pumps, one of the largest manufacturers of portable pumps, introduced its Extreme Duty High Lift (HL) series of pumps and more mines are finding unique applications for these pumps. The Extreme HL series is a range single-stage Dri-Prime pumps with heads up to 600 feet and flows up to 5,000 gallons per minute. The American Coal Co.'s Galatia mine, an underground longwall mine in southern Illinois, used an HL 160 to replace a multiple-staged centrifugal pump. It provided Galatia with 1,500 gpm at 465 ft. 3 photos.

Fiscor, S.

2006-10-15T23:59:59.000Z

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


301

Climate, extreme heat, and electricity demand in California  

SciTech Connect

Climate projections from three atmosphere-ocean climate models with a range of low to mid-high temperature sensitivity forced by the Intergovernmental Panel for Climate Change SRES higher, middle, and lower emission scenarios indicate that, over the 21st century, extreme heat events for major cities in heavily air-conditioned California will increase rapidly. These increases in temperature extremes are projected to exceed the rate of increase in mean temperature, along with increased variance. Extreme heat is defined here as the 90 percent exceedance probability (T90) of the local warmest summer days under the current climate. The number of extreme heat days in Los Angeles, where T90 is currently 95 F (32 C), may increase from 12 days to as many as 96 days per year by 2100, implying current-day heat wave conditions may last for the entire summer, with earlier onset. Overall, projected increases in extreme heat under the higher A1fi emission scenario by 2070-2099 tend to be 20-30 percent higher than those projected under the lower B1 emission scenario, ranging from approximately double the historical number of days for inland California cities (e.g. Sacramento and Fresno), up to four times for previously temperate coastal cities (e.g. Los Angeles, San Diego). These findings, combined with observed relationships between high temperature and electricity demand for air-conditioned regions, suggest potential shortfalls in transmission and supply during T90 peak electricity demand periods. When the projected extreme heat and peak demand for electricity are mapped onto current availability, maintaining technology and population constant only for demand side calculations, we find the potential for electricity deficits as high as 17 percent. Similar increases in extreme heat days are suggested for other locations across the U.S. southwest, as well as for developing nations with rapidly increasing electricity demands. Electricity response to recent extreme heat events, such as the July 2006 heat wave in California, suggests that peak electricity demand will challenge current supply, as well as future planned supply capacities when population and income growth are taken into account.

Miller, N.L.; Hayhoe, K.; Jin, J.; Auffhammer, M.

2008-04-01T23:59:59.000Z

302

TECA: A Parallel Toolkit for Extreme Climate Analysis  

SciTech Connect

We present TECA, a parallel toolkit for detecting extreme events in large climate datasets. Modern climate datasets expose parallelism across a number of dimensions: spatial locations, timesteps and ensemble members. We design TECA to exploit these modes of parallelism and demonstrate a prototype implementation for detecting and tracking three classes of extreme events: tropical cyclones, extra-tropical cyclones and atmospheric rivers. We process a modern TB-sized CAM5 simulation dataset with TECA, and demonstrate good runtime performance for the three case studies.

Prabhat, Mr; Ruebel, Oliver; Byna, Surendra; Wu, Kesheng; Li, Fuyu; Wehner, Michael; Bethel, E. Wes

2012-03-12T23:59:59.000Z

303

Top Ten Challenges in Extreme-Scale Visual Analytics  

Science Conference Proceedings (OSTI)

In the current special issue of IEEE Computer Graphics and Applications (CG&A), researchers share their research and development (R&D) findings and results on applying visual analytics to extreme-scale data. Having surveyed the special issue articles and other related R&D efforts in the area, we have identified what we consider to be the top challenges of extreme-scale visual analytics. To cater to the diverse readership of CG&A, our discussion evaluates challenges in all areas of the field, including algorithms, hardware, software, engineering, and social issues.

Wong, Pak C.; Shen, Han-Wei; Johnson, Christopher R.; Chen, Chaomei; Ross, Rob

2012-05-08T23:59:59.000Z

304

Feasibility of Determining Cloud-Top Heights Using the Backscattered Ultraviolet Satellite Observation Technique  

Science Conference Proceedings (OSTI)

A technique for determining cloud-top height by means of backscattered ultraviolet (BUV) solar radiation is presented. Cloud-top heights can be inferred using this technique if both the BUV radiance and its degree of polarization are measured by ...

Tadashi Aruga; Kaichi Maeda; Donald F. Heath

1984-05-01T23:59:59.000Z

305

Molecular Dynamics Model of Ultraviolet Matrix-Assisted Laser Desorption/Ionization Including Ionization Processes  

E-Print Network (OSTI)

Molecular Dynamics Model of Ultraviolet Matrix-Assisted Laser Desorption/Ionization Including A molecular dynamics model of UV-MALDI including ionization processes is presented. In addition/desorption of molecular systems, it includes radiative and nonradiative decay, exciton hopping, two pooling processes

Zhigilei, Leonid V.

306

Interaction of extremely-low-frequency electromagnetic fields with living systems  

SciTech Connect

The sources and physical properties of extremely-low-frequency (ELF) electromagnetic fields are described in this paper. Biological effects and mechanisms through which ELF fields interact with humans and other organisms are discussed, including several aspects of this subject that are presently under active laboratory investigation. Studies on the potential health effects of ELF fields present in the home and workplace are also summarized, including a critical evaluation of evidence for a possible linkage between exposure to ELF fields and cancer risk. 53 refs.

Tenforde, T.S.

1991-11-01T23:59:59.000Z

307

Extreme conditions during multibubble cavitation: Sonoluminescence as a spectroscopic probe  

E-Print Network (OSTI)

Cavitation MBSL Plasma a b s t r a c t We review recent work on the use of sonoluminescence (SL) to probe to $9000 K. The effective pressure during MBSL is $300 bar, based on atomic line shifts. Given nanosecond in a liquid, which can create extreme conditions in localized, short- lived hot spots. During the past few

Zimmerman, Steven C.

308

A new method for estimating extreme rainfall probabilities  

Science Conference Proceedings (OSTI)

As part of an EPRI-funded research program, the Yankee Atomic Electric Company developed a new method for estimating probabilities of extreme rainfall. It can be used, along with other techniques, to improve the estimation of probable maximum precipitation values for specific basins or regions.

Harper, G.A.; O'Hara, T.F. (Yankee Atomic Electric Company, Bolton, MA (United States)); Morris, D.I. (Electric Power Research Institute, Palo Alto, CA (United States))

1994-02-01T23:59:59.000Z

309

On the design of experiments to study extreme field limits  

SciTech Connect

We propose experiments on the collision of high intensity electromagnetic pulses with electron bunches and on the collision of multiple electromagnetic pulses for studying extreme field limits in the nonlinear interaction of electromagnetic waves. The effects of nonlinear QED will be revealed in these laser plasma experiments.

Bulanov, S. S.; Chen, M.; Schroeder, C. B.; Esarey, E.; Leemans, W. P.; Bulanov, S. V.; Esirkepov, T. Zh.; Kando, M.; Koga, J. K.; Zhidkov, A. G.; Chen, P.; Mur, V. D.; Narozhny, N. B.; Popov, V. S.; Thomas, A. G. R.; Korn, G. [University of California, Berkeley, California 94720 (United States); Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States) and University of California, Berkeley, California 94720 (United States); Kansai Photon Science Institute, JAEA, Kizugawa, Kyoto 619-0215 (Japan); Osaka University, Osaka 565-0871 (Japan); Leung Center for Cosmology and Particle Astrophysics, National Taiwan University, Taipei 10617, Taiwan (China); Moscow Engineering Physics Institute (State University), Moscow 115409 (Russian Federation); Institute of Theoretical and Experimental Physics, Moscow 117218 (Russian Federation); University of Michigan, Ann Arbor, Michigan 48103 (United States); Max-Planck-Institut fur Quantenoptik, Garching 85748 (Germany) and ELI Beamline Facility, Institute of Physics, Czech Academy of Sciences, Prague 18221 (Czech Republic)

2012-12-21T23:59:59.000Z

310

Probability Models for Annual Extreme Water-Equivalent Ground Snow  

Science Conference Proceedings (OSTI)

A statistical analysis of annual extreme water-equivalents of ground snow (reported as inches of water) measured up through the winter of 1979–80 at 76 weather stations in the northeast quadrant of the United States is presented. The analysis ...

Bruce Ellingwood; Robert K. Redfield

1984-06-01T23:59:59.000Z

311

Rule-Based prediction of rare extreme values  

Science Conference Proceedings (OSTI)

This paper describes a rule learning method that obtains models biased towards a particular class of regression tasks. These tasks have as main distinguishing feature the fact that the main goal is to be accurate at predicting rare extreme values of ...

Rita Ribeiro; Luís Torgo

2006-10-01T23:59:59.000Z

312

An extreme-distance approach to multiple criteria ranking  

Science Conference Proceedings (OSTI)

A distance approach based on extreme points, or predefined ideal and anti-ideal points, is proposed to improve on the TOPSIS (Technique for Order Performance [or Ordered Preference] by Similarity to Ideal Solution) method of multiple criteria ranking. ... Keywords: Comparative study, Distance-based ranking, Multiple criteria decision analysis, Multiple criteria ranking, TOPSIS

Ye Chen; D. Marc Kilgour; Keith W. Hipel

2011-03-01T23:59:59.000Z

313

ENSO and Extreme Rainfall Events in South America  

Science Conference Proceedings (OSTI)

The influence of the opposite phases of ENSO on the frequency of extreme rainfall events over South America is analyzed for each month of the ENSO cycle on the basis of a large set of daily station rainfall data and compared with the influence of ...

Alice M. Grimm; Renata G. Tedeschi

2009-04-01T23:59:59.000Z

314

Causal Analysis of the Unanticipated Extremity Exposure at HFEF  

SciTech Connect

This report covers the unintended extremity exposure to an operator while handling a metallurgical mount sample of irradiated fuel following an off-scale high beta radiation reading of the sample. The decision was made to continue working after the meter indicated high off-scale by the HPT Supervisor, which resulted in the operator at the next operation being exposed.

David E. James; Charles R. Posegate; Thomas P. Zahn; Alan G. Wagner

2011-11-01T23:59:59.000Z

315

Laura Roach Islamic Extremism: Undermining a Fundamentalist Movement in Indonesia  

E-Print Network (OSTI)

Laura Roach Islamic Extremism: Undermining a Fundamentalist Movement in Indonesia College: COLSA, Major: EREC Freshman Editor: Stephanie Weiner #12;I. Problem Indonesia has the largest Muslim population, Indonesia is not an Islamic state; it is the third largest democracy in the world.1 Unsurprisingly

New Hampshire, University of

316

A tree augmented classifier based on Extreme Imprecise Dirichlet Model  

Science Conference Proceedings (OSTI)

We present TANC, a TAN classifier (tree-augmented naive) based on imprecise probabilities. TANC models prior near-ignorance via the Extreme Imprecise Dirichlet Model (EDM). A first contribution of this paper is the experimental comparison between EDM ... Keywords: Classification, Classifier, Imprecise Dirichlet Model, Naive credal, TANC

G. Corani; C. P. de Campos

2010-11-01T23:59:59.000Z

317

Microsoft Word - Achieving Extreme Efficiency cvr.doc  

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

01E 01E Achieving Extreme Efficiency: How to get the job done when energy is extremely expensive and scarce Rich Brown, Louis-Benoit Desroches, Karina Garbesi and Alan Meier Environmental Energy Technologies Division June 2012 To be presented at the 2012 ACEEE Summer Study on Energy Efficiency in Buildings, Asilomar, CA, August 2012, and to be published in the Proceedings of the 2012 ACEEE Summer Study on Energy Efficiency in Buildings, in Asilomar, CA. August 2012 DISCLAIMER This document was prepared as an account of work sponsored by the United States Government. While this document is believed to contain correct information, neither the United States Government nor any agency thereof, nor The Regents of the University of California, nor any of their employees, makes any warranty, express or implied, or assumes

318

The Extreme Benchmark Suite: Measuring High-Performance Embedded Systems  

E-Print Network (OSTI)

The Extreme Benchmark Suite (XBS) is designed to support performance measurement of highly parallel “extreme ” processors, many of which are designed to replace custom hardware implementations. XBS is designed to avoid many of the problems that occur when using existing benchmark suites with nonstandard and experimental architectures. In particular, XBS is intended to provide a fair comparison of a wide range of architectures, from general-purpose processors to hard-wired ASIC implementations. XBS has a clean modular structure to reduce porting effort, and is designed to be usable with slow cycle-accurate simulators. This work presents the motivation for the creation of XBS and describes in detail the XBS framework. Several benchmarks implemented with this framework are discussed, and these benchmarks are used to compare a standard platform, an experimental architecture, and custom

Steven Gerding; Krste Asanovi?

2005-01-01T23:59:59.000Z

319

Top Ten Interaction Challenges in Extreme-Scale Visual Analytics  

Science Conference Proceedings (OSTI)

The chapter presents ten selected user interfaces and interaction challenges in extreme-scale visual analytics. The study of visual analytics is often referred to as 'the science of analytical reasoning facilitated by interactive visual interfaces' in the literature. The discussion focuses on the issues of applying visual analytics technologies to extreme-scale scientific and non-scientific data ranging from petabyte to exabyte in sizes. The ten challenges are: in situ interactive analysis, user-driven data reduction, scalability and multi-level hierarchy, representation of evidence and uncertainty, heterogeneous data fusion, data summarization and triage for interactive query, analytics of temporally evolving features, the human bottleneck, design and engineering development, and the Renaissance of conventional wisdom. The discussion addresses concerns that arise from different areas of hardware, software, computation, algorithms, and human factors. The chapter also evaluates the likelihood of success in meeting these challenges in the near future.

Wong, Pak C.; Shen, Han-Wei; Chen, Chaomei

2012-05-31T23:59:59.000Z

320

Effect of Short-Term Solar Ultraviolet Flux Variability in a Coupled Model of Photochemistry and Dynamics  

Science Conference Proceedings (OSTI)

Variability in the solar ultraviolet radiative flux is known to cause changes in the chemistry and dynamics of the middle and upper atmosphere. Specifically, the 27-day solar rotation signal in irradiance has been correlated with responses in ...

Xun Zhu; Jeng-Hwa Yee; Elsayed R. Talaat

2003-02-01T23:59:59.000Z

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


321

Impacts of Extreme Weather on Power Systems and Components  

Science Conference Proceedings (OSTI)

Heat storm events resulted in an abnormally high rate of failure among small distribution transformers across California in 2006 and 2007. Hurricanes, such as Katrina and Ike, also resulted in widespread damage to the power infrastructure and caused severe outages, which affected millions of customers for days. The costs of such events, and other extreme weather conditions, amounted to hundreds of millions of dollars in damages and brought heavy scrutiny from public officials and regulatory bodies. This ...

2009-12-23T23:59:59.000Z

322

Extremely long hard bursts observed by Konus-Wind  

SciTech Connect

We report the observations of the prompt emission of the extremely long hard burst, GRB 060814B, discovered by Konus-Wind and localized by the IPN. The observations reveal a smooth, hard, {approx}40-min long pulse followed by weaker emission seen several hours after the burst onset. We also present the Konus-Wind data on similar burst, GRB 971208, localized by BATSE/IPN. And finally we discuss the different possible origins of these unusual events.

Pal'shin, V.; Aptekar, R.; Frederiks, D.; Golenetskii, S.; Il'inskii, V.; Mazets, E.; Oleynik, P.; Ulanov, M. [Ioffe Physical-Technical Institute of the Russian Academy of Sciences, St. Petersburg, 194021 (Russian Federation); Yamaoka, K. [Department of Physics and Mathematics, Aoyama Gakuin University, 5-10-1, Fuchinobe, Sagamihara 229-8558 (Japan); Ohno, M. [Department of Physical Sciences, School of Science, Hiroshima University 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526 (Japan); Hurley, K. [Space Sciences Laboratory, University of California at Berkeley, Berkeley, CA 94720-7450 (United States); Sakamoto, T. [Goddard Space Flight Center, NASA, Greenbelt, MD 20771 (United States); Mitrofanov, I. G.; Golovin, D.; Lirvak, M. L.; Sanin, A. B. [Institute for Space Research, Profsojuznaja 84/32, Moscow 117997 (Russian Federation); Boynton, W.; Fellows, C.; Harshman, K.; Shinohara, C. [Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721 (United States)] (and others)

2008-05-22T23:59:59.000Z

323

The alliance for computing at the extreme scale.  

SciTech Connect

Los Alamos and Sandia National Laboratories have formed a new high performance computing center, the Alliance for Computing at the Extreme Scale (ACES). The two labs will jointly architect, develop, procure and operate capability systems for DOE's Advanced Simulation and Computing Program. This presentation will discuss a petascale production capability system, Cielo, that will be deployed in late 2010, and a new partnership with Cray on advanced interconnect technologies.

Ang, James Alfred; Dosanjh, Sudip Singh; Doerfler, Douglas W.; Hemmert, Karl Scott; Vigil, Manuel (Los Alamos National Laboratory, Los Alamos, NM); Koch, Ken (Los Alamos National Laboratory, Los Alamos, NM); Morrison, John (Los Alamos National Laboratory, Los Alamos, NM)

2010-05-01T23:59:59.000Z

324

Far Ultraviolet Continuum Emission: Applying this Diagnostic to the Chromospheres of Solar-Mass Stars  

E-Print Network (OSTI)

The far ultraviolet (FUV) continuum flux is recognized as a very sensitive diag- nostic of the temperature structure of the Sun's lower chromosphere. Until now analysis of the available stellar FUV data has shown that solar-type stars must also have chromospheres, but quantitative analyses of stellar FUV continua require far higher quality spectra and comparison with new non-LTE chromosphere models. We present accurate far ultraviolet (FUV, 1150-1500^{\\circ}) continuum flux measurements for solar-mass stars, made feasible by the high throughput and very low detector background of the Cosmic Origins Spectrograph (COS) on the Hubbble Space Telescope. We show that the continuum flux can be measured above the detector background even for the faintest star in our sample. We find a clear trend of increasing continuum brightness temperature at all FUV wavelengths with decreasing rotational period, which provides an important measure of magnetic heating rates in stellar chromospheres. Comparison with semiempirical so...

Linsky, Jeffrey L; Ayres, Tom; Fontenla, Juan; France, Kevin

2011-01-01T23:59:59.000Z

325

Final LDRD report :ultraviolet water purification systems for rural environments and mobile applications.  

SciTech Connect

We present the results of a one year LDRD program that has focused on evaluating the use of newly developed deep ultraviolet LEDs in water purification. We describe our development efforts that have produced an LED-based water exposure set-up and enumerate the advances that have been made in deep UV LED performance throughout the project. The results of E. coli inactivation with 270-295 nm LEDs are presented along with an assessment of the potential for applying deep ultraviolet LED-based water purification to mobile point-of-use applications as well as to rural and international environments where the benefits of photovoltaic-powered systems can be realized.

Banas, Michael Anthony; Crawford, Mary Hagerott; Ruby, Douglas Scott; Ross, Michael P.; Nelson, Jeffrey Scott; Allerman, Andrew Alan; Boucher, Ray

2005-11-01T23:59:59.000Z

326

Preface to Symposium: Matter at Extreme Conditions: Theory and Application  

DOE Green Energy (OSTI)

The subject of ''Matter at Extreme Conditions'' encompasses a wide range of phenomena the thrust of which is to address the physical and chemical behaviors of materials exposed to ''abnormal'' conditions of high pressures, temperature extremes, or external fields. Recent advances in theoretical methodologies and first principle computational studies have predicted unusual properties and unraveled a few surprises when matter is subjected to such strains: a reversed and anomalous Doppler effects in shocked periodic media, the possible existence of low temperature liquid metallic state of hydrogen, and a superionic phase of water at high temperature and pressure. A unified approach from quantum mechanical principles allows for exploring such diverse and disparate subjects as ultracold plasmas in a strong magnetic field, and the dynamic aspects of Bose-Einstein condensates. These topics, which are aptly presented in this symposium, are but a few examples of interesting discoveries and methodologies in this active and exciting area of research. The development of reactive force fields from quantum mechanical principles for use in conjunction with molecular dynamics provide us with an invaluable tool for large-scale simulations to study the chemical transformations and decomposition products of complex organic systems at extreme conditions. Simulations implementing classical fields can provide an unprecedented access to the short time scales of chemical events that occur in dense fluids at high-temperature, and for the study of atomic clusters under strong laser pulses.

Manaa, M R

2005-07-20T23:59:59.000Z

327

Effect of ultraviolet irradiation on luminescence properties of undoped ZnS and ZnS:Ag nanoparticles  

SciTech Connect

Undoped ZnS and ZnS:Ag nanoparticles have been prepared through hydrothemal synthesis. The changes of luminescence properties induced by ultraviolet irradiation have been investigated. For both samples, the initial slight increase in luminescence is ascribed to the fast electron filling, while the succedent decrease is supposed to be caused by nonradiative pathways originating from some unknown photochemical products. The more remarkable decrease in ZnS:Ag is put down to the segregation of Ag on the surfaces of ZnS:Ag nanoparticles. Multipeaks Gaussian fitting is applied to the emission spectra. The fitting peaks around 490 nm in both samples are related with the surface states emission and the fitting peaks around 456 nm in ZnS nanoparticles and 443 nm in ZnS:Ag nanoparticles are attributed to the type of donor-acceptor pair luminescence, which corresponds to the transition between different donor levels and acceptor levels in different samples. A model of stretched exponential function is used to fit the fluorescence decay spectra. Result shows that the introduction of Ag{sup +} ions causes a spectacular lifetime shortening of ZnS. Experiment result also verifies the model as that the lifetimes of both samples are notably shortened after irradiation for 2 h.

Qu Hua; Cao Lixin; Su Ge; Liu Wei; Sun Yuanguang; Dong Bohua [Institute of Material Science and Engineering, Ocean University of China, Qingdao 266100 (China)

2009-11-01T23:59:59.000Z

328

Interaction of Metallophthalocyanines (Mpc, M=Co, Ni) on Au(001): Ultraviolet Photoemission Spectroscopy and Low Energy Electron Diffraction Study  

Science Conference Proceedings (OSTI)

Thin films of metallophthalocyanine (MPc,M=Co,Ni) evaporated onto a '5x20' reconstructed Au(001) substrate at room temperature have been investigated by employing low energy electron diffraction (LEED) and ultraviolet photoelectron spectroscopy (UPS). The LEED images from NiPc thin films show that the overlayers are highly ordered with a square unit cell of 12.8x12.8 {angstrom}{sup 2} aligned along the {l_angle}110{r_angle} and {l_angle}1{bar 1}0{r_angle} axes of the Au(001) substrate. For CoPc, the LEED pattern reveals the superposition of multiple rotationally equivalent domains of a 12.9x12.9 {angstrom}{sup 2} square lattice which are rotated by 16{sup o} with respect to each other. The contrast between NiPc and CoPc on Au(001) is further demonstrated in the interfacial electronic structure. UPS studies of the interfacial layers of NiPc deposited on the hexagonally reconstructed gold substrate indicate that NiPc physisorbs on the gold surface as evidenced by a uniform molecular orbital (MO) shift. The CoPc MO's, on the other hand, indicates a charge transfer at the interface, evidenced by the 13a{sub 1g} MO interacting with the Au surface.

Ellis,T.; Park, K.; Ulrich, M.; Hulbert, S.; Rowe, J.

2006-01-01T23:59:59.000Z

329

The Far Ultraviolet Spectroscopic Explorer: Mission Overview and Prospects for Studies of the Interstellar Medium and High Velocity Clouds  

E-Print Network (OSTI)

The Far Ultraviolet Spectroscopic Explorer (FUSE) is a NASA astronomy mission that will explore the 905-1187 A wavelength region at high spectral resolution. Funded by NASA's Explorer Program, this Origins mission is scheduled for a 1999 launch and at least three years of operations. The development of FUSE is being led by the Johns Hopkins University, with major contributions to the program from the University of Colorado, the University of California-Berkeley, the space agencies of Canada and France, and corporate partners. FUSE will have approximately 10,000 times the sensitivity of its pioneering predecessor, Copernicus, which operated in the 1970s. Much of the FUSE Science Team observing time will be dedicated to studying the interstellar medium of the Milky Way and Magellanic Clouds. Observations of high velocity clouds play an important role in the FUSE program. In this paper, I outline some of the FUSE Science Team plans for observing HVCs. Simple absorption line models are also provided for investigators seeking to identify atomic and molecular species in this wavelength region.

Kenneth R. Sembach

1998-11-19T23:59:59.000Z

330

Exploring the physical properties of local star-forming ULIRGs from the ultraviolet to the infrared  

E-Print Network (OSTI)

We present an application of the da Cunha, Charlot & Elbaz (2008) model of the spectral energy distribution (SEDs) of galaxies from the ultraviolet to far-infrared to a small pilot sample of purely star-forming Ultra-Luminous Infrared Galaxies (ULIRGs). We interpret the observed SEDs of 16 ULIRGs using this physically-motivated model which accounts for the emission of stellar populations from the ultraviolet to the near-infrared and for the attenuation by dust in two components: an optically-thick starburst component and the diffuse ISM. The infrared emission is computed by assuming that all the energy absorbed by dust in these components is re-radiated at mid- and far-infrared wavelengths. This model allows us to derive statistically physical properties including star formation rates, stellar masses, as well as temperatures and masses of different dust components and plausible star formation histories. We find that, although the ultraviolet to near-infrared emission represents only a small fraction of th...

da Cunha, Elisabete; Diaz-Santos, Tanio; Armus, Lee; Marshall, Jason A; Elbaz, David

2010-01-01T23:59:59.000Z

331

Segmented Ultralight Pre-Aligned Rotor for Extreme-Scale Wind Turbines  

SciTech Connect

To alleviate the mass-scaling issues associated with conventional upwind rotors of extreme-scale turbines, a downwind rotor concept is proposed which employs fixed blade curvature based on force alignment at rated conditions. For a given peak stress constraint, the reduction in downwind cantilever loads allows reduced shell and spar thickness, and thus a reduced blade mass as compared with a conventional upwind rotor, especially as rotor sizes approach extreme-scales. To quantify this mass reduction, a Finite Element Analysis was conducted for a 10 MW rated rotor based on the NREL offshore 5 MW baseline wind turbine. The results show that this 'pre-alignment' yields a net downstream deflection of 32 deg, a downward hub-pitch angle of 6 deg, a 20% increase in blade length (to maintain the same radius as the conventional blade), and a net mass savings of about 50% through decreased shell and spar thicknesses. The pre-alignment may also allow a more straightforward and efficient segmentation of the blade since shear stresses near joints are substantially reduced. Segmenting, in turn, can dramatically reduce costs associated with fabrication, transport and assembly for extreme-scale off-shore systems. The pre-aligned geometric curvature can also help alleviate tower wake effects on the blades since blade tips (where shadow effects can be most problematic) are shifted downstream where the tower wake is weaker. In addition, the portion of the tower that is upstream of the blade tips can be faired with an externally-rotating aerodynamic shroud. Furthermore, the downwind rotor can allow a floating off-shore tri-pod platform to reduce tower weight and yaw-control requirements. A simple economic analysis of the segmented ultralight pre-aligned rotor (SUPAR) concept suggests that the overall system cost savings can be as much as 25%, indicating that more detailed (numerical and experimental) investigations are warranted.

Loth, E.; Steele, A.; Ichter, B.; Selig, M.; Moriarty, P.

2012-01-01T23:59:59.000Z

332

Scientific aspects of hydraulic engineering in the Extreme North  

SciTech Connect

Information relative to participation of the B. E. Vedeneev All-Russian Scientific-Research Institute of Hydraulic Engineering (VNIIG im. B. E. Vedeneeva) in the solution of problems of scientific verification of the design, construction, and operation of water-development works in regions of the Extreme North are presented. Basic characteristics of changes in the technical condition of high rock-and-earthfill dams, and the conditions under which their safety is ensured for long-term service in these regions are examined.

Panov, S. I.; Krivonogova, N. F.

2012-03-15T23:59:59.000Z

333

Global Distribution of Extreme Precipitation and High-Impact Landslides in 2010 Relative to Previous Years  

Science Conference Proceedings (OSTI)

It is well known that extreme or prolonged rainfall is the dominant trigger of landslides worldwide. While research has evaluated the spatiotemporal distribution of extreme rainfall and landslides at local or regional scales using in situ data, ...

Dalia Kirschbaum; Robert Adler; David Adler; Christa Peters-Lidard; George Huffman

2012-10-01T23:59:59.000Z

334

Global Precipitation Extremes Associated with Diurnally Varying Low-Level Jets  

Science Conference Proceedings (OSTI)

Extreme rainfall events have important societal impacts: for example, by causing flooding, replenishing reservoirs, and affecting agricultural yields. Previous literature has documented linkages between rainfall extremes and nocturnal low-level ...

Andrew J. Monaghan; Daran L. Rife; James O. Pinto; Christopher A. Davis; John R. Hannan

2010-10-01T23:59:59.000Z

335

Extreme Rainfall in the Mediterranean: What Can We Learn from Observations?  

Science Conference Proceedings (OSTI)

Flash floods induced by extreme rainfall events represent one of the most life-threatening phenomena in the Mediterranean. While their catastrophic ground effects are well documented by postevent surveys, the extreme rainfall events that generate ...

N. Rebora; L. Molini; E. Casella; A. Comellas; E. Fiori; F. Pignone; F. Siccardi; F. Silvestro; S. Tanelli; A. Parodi

2013-06-01T23:59:59.000Z

336

Developing Synoptic Analogs for Extreme Mass Balance Conditions on Queen Elizabeth Island Ice Caps  

Science Conference Proceedings (OSTI)

Detailed synoptic and climate analyses were undertaken for summer seasons during which extreme mass balance conditions were recorded on glaciers in the Queen Elizabeth Islands in high Arctic Canada. Three types of mass balance extremes were ...

Bea Taylor Alt

1987-12-01T23:59:59.000Z

337

Projected Tasman Sea extremes in sea surface temperature through the 21st Century  

Science Conference Proceedings (OSTI)

Ocean climate extremes have received little treatment in the literature, aside from coastal sea level and temperatures affecting coral bleaching. Further, it is notable that extremes, e.g., temperature and precipitation, are typically not well ...

Eric C. J. Oliver; Simon J. Wotherspoon; Matt A. Chamberlain; Neil J. Holbrook

338

Are Temperature and Precipitation Extremes Increasing over the U.S. High Plains?  

Science Conference Proceedings (OSTI)

Large-scale environmental, social, and economic impacts of recent weather and climate extremes are raising questions about whether the frequency and intensity of these extremes have been increasing. Here, the authors evaluate trends in climate ...

Di Long; Bridget R. Scanlon; D. Nelun Fernando; Lei Meng; Steven M. Quiring

2012-12-01T23:59:59.000Z

339

Use of Normalized Anomaly Fields to Anticipate Extreme Rainfall in the Mountains of Northern California  

Science Conference Proceedings (OSTI)

Extreme rainfall events contribute a large portion of wintertime precipitation to northern California. The motivations of this paper were to study the observed differences in the patterns between extreme and more commonly occurring lighter ...

Norman W. Junker; Richard H. Grumm; Robert Hart; Lance F. Bosart; Katherine M. Bell; Frank J. Pereira

2008-06-01T23:59:59.000Z

340

Differential Adaptive Capacity to Extreme Heat: A Phoenix, Arizona, Case Study  

Science Conference Proceedings (OSTI)

Climate change is projected to increase the number of days producing excessive heat across the southwestern United States, increasing population exposure to extreme heat events. Extreme heat is currently the main cause of weather-related mortality ...

Mary H. Hayden; Hannah Brenkert-Smith; Olga V. Wilhelmi

2011-10-01T23:59:59.000Z

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


341

CO2 Sensitivity of Extreme Climate Events in the Western United States  

Science Conference Proceedings (OSTI)

Based upon trends in observed climate, extreme events are thought to be increasing in frequency and/or magnitude. This change in extreme events is attributed to enhancement of the hydrologic cycle caused by increased greenhouse gas ...

Jason L. Bell; Lisa C. Sloan

2006-07-01T23:59:59.000Z

342

Methods for Exploring Spatial and Temporal Variability of Extreme Events in Climate Data  

Science Conference Proceedings (OSTI)

This study presents various statistical methods for exploring and summarizing spatial extremal properties in large gridpoint datasets. Extremal properties are inferred from the subset of gridpoint values that exceed sufficiently high, time-...

C. A. S. Coelho; C. A. T. Ferro; D. B. Stephenson; D. J. Steinskog

2008-05-01T23:59:59.000Z

343

Tests of the Generalized Pareto Distribution for Predicting Extreme Wind Speeds  

Science Conference Proceedings (OSTI)

Extreme wind speed predictions are often based on statistical analysis of site measurements of annual maxima, using one of the Generalized Extreme Value (GEV) distributions. An alternative method applies one of the Generalized Pareto ...

B. B. Brabson; J. P. Palutikof

2000-09-01T23:59:59.000Z

344

Expected Structure of Extreme Waves in a Gaussian Sea. Part I: Theory and SWADE Buoy Measurements  

Science Conference Proceedings (OSTI)

This paper is concerned with the expected configuration in space and time surrounding extremely high crests in a random wave field, or, equivalently, the mean configuration averaged over realizations of extreme events. A simple, approximate ...

O. M. Phillips; Daifang Gu; Mark Donelan

1993-05-01T23:59:59.000Z

345

Trends in Extreme Temperatures in Relation to Urbanization in the Twin Cities Metropolitan Area, Minnesota  

Science Conference Proceedings (OSTI)

The long-term trends in extreme summer season temperatures across the Twin Cities Metropolitan Area (TCMA) associated with urbanization are examined. To assess trends in extreme temperature data, maximum and minimum temperatures from 1975 to 2002 ...

Shouraseni Sen Roy; Fei Yuan

2009-03-01T23:59:59.000Z

346

Bayesian Changepoint Analysis for Extreme Events (Typhoons, Heavy Rainfall, and Heat Waves): An RJMCMC Approach  

Science Conference Proceedings (OSTI)

A hierarchical Bayesian framework is developed to identify multiple abrupt regime shifts in an extreme event series. Specifically, extreme events are modeled as a Poisson process with a gamma-distributed rate. Multiple candidate hypotheses are ...

Xin Zhao; Pao-Shin Chu

2010-03-01T23:59:59.000Z

347

Characterizing the Variability and Extremes of the Stratospheric Polar Vortices Using 2D Moment Analysis  

Science Conference Proceedings (OSTI)

The mean state, variability, and extreme variability of the stratospheric polar vortices, with an emphasis on the Northern Hemisphere (NH) vortex, are examined using two-dimensional moment analysis and extreme value theory (EVT). The use of ...

Daniel M. Mitchell; Andrew J. Charlton-Perez; Lesley J. Gray

2011-06-01T23:59:59.000Z

348

Distribution of Extreme Winds in the Bonneville Power Administration Service Area  

Science Conference Proceedings (OSTI)

Annual extreme 1 min wind speeds at 78 Pacific Northwest locations were analyzed using the Fisher-Tippet type II extreme value function. From computed mean recurrence intervals, we could easily determine the wind speed likely to recur in a ...

J. William Wantz; Robert E. Sinclair

1981-12-01T23:59:59.000Z

349

How Do You Stay Warm While Saving Money and Energy in Extreme...  

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

Stay Warm While Saving Money and Energy in Extreme Weather? How Do You Stay Warm While Saving Money and Energy in Extreme Weather? February 3, 2011 - 6:30am Addthis Many states are...

350

Basic Research Needs for Materials Under Extreme Environments. Report of the Basic Energy Sciences Workshop on Materials Under Extreme Environments, June 11-13, 2007  

SciTech Connect

To evaluate the potential for developing revolutionary new materials that will meet demanding future energy requirements that expose materials to environmental extremes.

Wadsworth, J.; Crabtree, G. W.; Hemley, R. J.; Falcone, R.; Robertson, I.; Stringer, J.; Tortorelli, P.; Gray, G. T.; Nicol, M.; Lehr, J.; Tozer, S. W.; Diaz de la Rubia, T.; Fitzsimmons, T.; Vetrano, J. S.; Ashton, C. L.; Kitts, S.; Landson, C.; Campbell, B.; Gruzalski, G.; Stevens, D.

2008-02-01T23:59:59.000Z

351

Contribution of Land Use Changes to Near-Surface Air Temperatures during Recent Summer Extreme Heat Events in the Phoenix Metropolitan Area  

Science Conference Proceedings (OSTI)

The impact of 1973–2005 land use–land cover (LULC) changes on near-surface air temperatures during four recent summer extreme heat events (EHEs) are investigated for the arid Phoenix, Arizona, metropolitan area using the Weather Research and ...

Susanne Grossman-Clarke; Joseph A. Zehnder; Thomas Loridan; C. Sue B. Grimmond

2010-08-01T23:59:59.000Z

352

VARIABILITY OF THE INFRARED EXCESS OF EXTREME DEBRIS DISKS  

SciTech Connect

Debris disks with extremely large infrared excesses (fractional luminosities >10{sup -2}) are rare. Those with ages between 30 and 130 Myr are of interest because their evolution has progressed well beyond that of protoplanetary disks (which dissipate with a timescale of order 3 Myr), yet they represent a period when dynamical models suggest that terrestrial planet building may still be progressing through large, violent collisions that could yield large amounts of debris and large infrared excesses. For example, our Moon was formed through a violent collision of two large protoplanets during this age range. We report two disks around the solar-like stars ID8 and HD 23514 in this age range where the 24 {mu}m infrared excesses vary on timescales of a few years, even though the stars are not variable in the optical. Variations this rapid are difficult to understand if the debris is produced by collisional cascades, as it is for most debris disks. It is possible that the debris in these two systems arises in part from condensates from silicate-rich vapor produced in a series of violent collisions among relatively large bodies. If their evolution is rapid, the rate of detection of extreme excesses would indicate that major collisions may be relatively common in this age range.

Meng, Huan Y. A.; Rieke, George H. [Department of Planetary Sciences, Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721 (United States); Su, Kate Y. L.; Rujopakarn, Wiphu [Steward Observatory, University of Arizona, Tucson, AZ 85721 (United States); Ivanov, Valentin D. [European Southern Observatory, Ave. Alonso de Cordova 3107, Casilla 19, Santiago, 19001 (Chile); Vanzi, Leonardo [Department of Electrical Engineering and Center of Astro Engineering, Pontificia Universidad Catolica de Chile, Ave. Vicuna Mackenna 4860, Santiago (Chile)

2012-05-20T23:59:59.000Z

353

Characterization and Impact of Extreme Forecast Errors on Power Systems  

SciTech Connect

Extreme events in the electrical power system, caused by the load and wind forecasting errors, can impact the power system infrastructure via two main avenues. The first avenue is a sudden and significant power unbalance exceeding reasonable operating reserve capacity. The second is a sudden increase of power flows on the system critical paths causing transmission violations. The challenge in managing these system unbalances is more significant for a standalone balancing area operation. The consolidation of balancing authorities into a single balancing area can offset the operating reserve problem but this strategy enhances incremental power flows on the transmission interfaces, potentially leading to more unpredictable transmission congestion. This paper evaluates the expectancy of occurrence of tail events due to forecast error extremes using California ISO and BPA data. Having this type of information, independent system operators and operating utilities could be better prepared to address the tail events by exploring alternative reserve options such as: wide area control coordination, new operating proce-dures and remedial actions.

Heydt, Gerald T.; Vittal, Vijay; Malhara, Sunita V.; Makarov, Yuri V.; Zhou, Ning; Etingov, Pavel V.

2011-12-15T23:59:59.000Z

354

Probing the origin of cosmic-rays with extremely high energy neutrinos using the IceCube Observatory  

E-Print Network (OSTI)

We have searched for extremely high energy neutrinos using data taken with the IceCube detector between May 2010 and May 2012. Two neutrino induced particle shower events with energies around 1 PeV were observed, as reported previously. In this work, we investigate whether these events could originate from cosmogenic neutrinos produced in the interactions of ultra-high energy cosmic-rays with ambient photons while propagating through intergalactic space. Exploiting IceCube's large exposure for extremely high energy neutrinos and the lack of observed events above 100 PeV, we can rule out the corresponding models at more than 90% confidence level. The model independent quasi-differential 90% CL upper limit, which amounts to $E^2 \\phi_{\

IceCube Collaboration; M. G. Aartsen; R. Abbasi; M. Ackermann; J. Adams; J. A. Aguilar; M. Ahlers; D. Altmann; C. Arguelles; J. Auffenberg; X. Bai; M. Baker; S. W. Barwick; V. Baum; R. Bay; J. J. Beatty; J. Becker Tjus; K. -H. Becker; S. BenZvi; P. Berghaus; D. Berley; E. Bernardini; A. Bernhard; D. Z. Besson; G. Binder; D. Bindig; M. Bissok; E. Blaufuss; J. Blumenthal; D. J. Boersma; C. Bohm; D. Bose; S. Böser; O. Botner; L. Brayeur; H. -P. Bretz; A. M. Brown; R. Bruijn; J. Casey; M. Casier; D. Chirkin; A. Christov; B. Christy; K. Clark; F. Clevermann; S. Coenders; S. Cohen; D. F. Cowen; A. H. Cruz Silva; M. Danninger; J. Daughhetee; J. C. Davis; M. Day; C. De Clercq; S. De Ridder; P. Desiati; K. D. de Vries; M. de With; T. DeYoung; J. C. Díaz-Vélez; M. Dunkman; R. Eagan; B. Eberhardt; J. Eisch; S. Euler; P. A. Evenson; O. Fadiran; A. R. Fazely; A. Fedynitch; J. Feintzeig; T. Feusels; K. Filimonov; C. Finley; T. Fischer-Wasels; S. Flis; A. Franckowiak; K. Frantzen; T. Fuchs; T. K. Gaisser; J. Gallagher; L. Gerhardt; L. Gladstone; T. Glüsenkamp; A. Goldschmidt; G. Golup; J. G. Gonzalez; J. A. Goodman; D. Góra; D. T. Grandmont; D. Grant; P. Gretskov; J. C. Groh; A. Groß; C. Ha; A. Haj Ismail; P. Hallen; A. Hallgren; F. Halzen; K. Hanson; D. Heereman; D. Heinen; K. Helbing; R. Hellauer; S. Hickford; G. C. Hill; K. D. Hoffman; R. Hoffmann; A. Homeier; K. Hoshina; W. Huelsnitz; P. O. Hulth; K. Hultqvist; S. Hussain; A. Ishihara; E. Jacobi; J. Jacobsen; K. Jagielski; G. S. Japaridze; K. Jero; O. Jlelati; B. Kaminsky; A. Kappes; T. Karg; A. Karle; M. Kauer; J. L. Kelley; J. Kiryluk; J. Kläs; S. R. Klein; J. -H. Köhne; G. Kohnen; H. Kolanoski; L. Köpke; C. Kopper; S. Kopper; D. J. Koskinen; M. Kowalski; M. Krasberg; A. Kriesten; K. Krings; G. Kroll; J. Kunnen; N. Kurahashi; T. Kuwabara; M. Labare; H. Landsman; M. J. Larson; M. Lesiak-Bzdak; M. Leuermann; J. Leute; J. Lünemann; O. Macías; J. Madsen; G. Maggi; R. Maruyama; K. Mase; H. S. Matis; F. McNally; K. Meagher; M. Merck; T. Meures; S. Miarecki; E. Middell; N. Milke; J. Miller; L. Mohrmann; T. Montaruli; R. Morse; R. Nahnhauer; U. Naumann; H. Niederhausen; S. C. Nowicki; D. R. Nygren; A. Obertacke; S. Odrowski; A. Olivas; A. Omairat; A. O'Murchadha; L. Paul; J. A. Pepper; C. Pérez de los Heros; C. Pfendner; D. Pieloth; D. Pieloth; E. Pinat; J. Posselt; P. B. Price; G. T. Przybylski; L. Rädel; M. Rameez; K. Rawlins; P. Redl; R. Reimann; E. Resconi; W. Rhode; M. Ribordy; M. Richman; B. Riedel; J. P. Rodrigues; C. Rott; T. Ruhe; B. Ruzybayev; D. Ryckbosch; S. M. Saba; H. -G. Sander; M. Santander; S. Sarkar; K. Schatto; F. Scheriau; T. Schmidt; M. Schmitz; S. Schoenen; S. Schöneberg; A. Schönwald; A. Schukraft; L. Schulte; O. Schulz; D. Seckel; Y. Sestayo; S. Seunarine; R. Shanidze; C. Sheremata; M. W. E. Smith; D. Soldin; G. M. Spiczak; C. Spiering; M. Stamatikos; T. Stanev; N. A. Stanisha; A. Stasik; T. Stezelberger; R. G. Stokstad; A. Stößl; E. A. Strahler; R. Ström; G. W. Sullivan; H. Taavola; I. Taboada; A. Tamburro; A. Tepe; S. Ter-Antonyan; G. Teši?; S. Tilav; P. A. Toale; M. N. Tobin; S. Toscano; E. Unger; M. Usner; S. Vallecorsa; N. van Eijndhoven; A. Van Overloop; J. van Santen; M. Vehring; M. Voge; M. Vraeghe; C. Walck; T. Waldenmaier; M. Wallraff; Ch. Weaver; M. Wellons; C. Wendt; S. Westerhoff; N. Whitehorn; K. Wiebe; C. H. Wiebusch; D. R. Williams; H. Wissing; M. Wolf; T. R. Wood; K. Woschnagg; D. L. Xu; X. W. Xu; J. P. Yanez; G. Yodh; S. Yoshida; P. Zarzhitsky; J. Ziemann; S. Zierke; M. Zoll

2013-10-21T23:59:59.000Z

355

Water Under the Extreme Conditions of Planetary Interiors: Symmetric Hydrogen Bonding in the Superionic Phase  

DOE Green Energy (OSTI)

The predicted superionic phase of water is investigated via ab initio molecular dynamics at densities of 2.0-3.0 g/cc (34 -115 GPa) along the 2000K isotherm.We find that extremely rapid (superionic) diffusion of protons occurs in a fluid phase at pressures between 34 and 58 GPa. A transition to a stable body-centered cubic (bcc) O lattice with superionic proton conductivity is observed between 70 and 75 GPa, a much higher pressure than suggested in prior work. We find that all molecular species at pressures greater than 75 GPa are too short lived to be classified as bound states. Above 95 GPa, a transient network phase is found characterized by symmetric O-H hydrogen bonding with nearly 50% covalent character.

Goldman, N; Fried, L E

2005-08-29T23:59:59.000Z

356

Water Under the Extreme Conditions of Planetary Interiors: Symmetric Hydrogen Bonding in the Superionic Phase  

DOE Green Energy (OSTI)

The predicted superionic phase of water is investigated via ab initio molecular dynamics at densities of 2.0-3.0 g/cc (34-115 GPa) along the 2000 K isotherm. They find that extremely rapid (superionic) diffusion of protons occurs in a fluid phase at pressures between 34 and 58 GPa. A transition to a stable body-centered cubic (bcc) O lattice with superionic proton conductivity is observed between 70 and 75 GPa, a much higher pressure than suggested in prior work. They find that all molecular species at pressures greater than 75 GPa are too short lived to be classified as bound states. Above 95 GPa, a transient network phase is found characterized by symmetric O-H hydrogen bonding with nearly 50% covalent character.

Goldman, N; Fried, L E

2005-07-08T23:59:59.000Z

357

COMPREHENSIVE OBSERVATIONS OF THE ULTRAVIOLET SPECTRUM AND IMPROVED ENERGY LEVELS FOR SINGLY IONIZED CHROMIUM (Cr II)  

SciTech Connect

We report new observations of the spectrum of singly ionized chromium (Cr II) in the region 1142-3954 A. The spectra were recorded with the National Institute of Standards and Technology 10.7 m normal-incidence vacuum spectrograph and FT700 vacuum ultraviolet Fourier transform spectrometer. More than 3600 lines are classified as transitions among 283 even and 368 odd levels. The new spectral data are used to re-optimize the energy levels, reducing their uncertainties by a typical factor of 20.

Sansonetti, Craig J.; Nave, Gillian; Reader, Joseph [National Institute of Standards and Technology, Gaithersburg, MD 20899 (United States); Kerber, Florian [European Southern Observatory, D-85748 Garching (Germany)

2012-10-15T23:59:59.000Z

358

Atomic hydrogen density measurements in an ion source plasma using a vacuum ultraviolet absorption spectrometer  

DOE Green Energy (OSTI)

A system to determine the density and temperature of ground state hydrogen atoms in a plasma by vacuum ultraviolet laser absorption spectroscopy is described. The continuous tunability of the spectrometer allows for analysis at any of the Lyman transitions. The narrow bandwidth of the laser system allows for the accurate determination of the absorption lineshape and hence the translational temperature. The utility of the system is exemplified by data obtained on an ion-source plasma. The measurements demonstrate the quality of the data as well as illustrating the behavior of this ion source under varying discharge conditions. 9 refs., 5 figs., 1 tab.

Stutzin, G.C.; Young, A.T.; Schlachter, A.S.; Stearns, J.W.; Leung, K.N.; Kunkel, W.B.; Worth, G.T.; Stevens, R.R.

1989-01-01T23:59:59.000Z

359

Extreme Precipitation and Temperature over the U.S. Pacific Northwest: A Comparison between Observations, Reanalysis Data, and Regional Models  

Science Conference Proceedings (OSTI)

Extreme precipitation and temperature indices in reanalysis data and regional climate models are compared to station observations. The regional models represent most indices of extreme temperature well. For extreme precipitation, finer grid ...

Valérie Dulière; Yongxin Zhang; Eric P. Salathé Jr.

2011-04-01T23:59:59.000Z

360

Decision support for improvisation in response to extreme events: Learning from the response to the 2001 World Trade Center attack  

Science Conference Proceedings (OSTI)

Extreme events such as natural or technological disasters challenge society's capabilities for planning and response. While advanced technologies and modeling techniques continue to expand how society can limit and manage extreme events, flexibility ... Keywords: Emergency response, Extreme events, Improvisation

David Mendonça

2007-04-01T23:59:59.000Z

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


361

Size-Related Behavior of Anatase Nanocrystals under Extreme Pressure |  

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

Boron-Based Compounds Trick a Biomedical Protein Boron-Based Compounds Trick a Biomedical Protein A Targeted Cancer Treatment using Nanomaterials When Roots Follow the Path of Least Resistance Perfecting Catalytic Arrays A Stable Open Framework with Wide Open Spaces Science Highlights Archives: 2013 | 2012 | 2011 | 2010 2009 | 2008 | 2007 | 2006 2005 | 2004 | 2003 | 2002 2001 | 2000 | 1998 | Subscribe to APS Science Highlights rss feed Size-Related Behavior of Anatase Nanocrystals under Extreme Pressure SEPTEMBER 27, 2009 Bookmark and Share Left: A polyhedral representation of the anatase TiO2 crystal structure. Right: Simplified relative cell parameter plots. The smoothly varying curves (+ diamond symbols) represent gold that was used as the pressure standard. The circles represent the 6-nm anatase. From the near vacuum of outer space to the intense pressure at a planet's

362

Extremal black attractors in 8D maximal supergravity  

SciTech Connect

Motivated by the new higher D-supergravity solutions on intersecting attractors obtained by Ferrara et al. in [Phys. Rev. D 79, 065031 (2009)], we focus in this paper on 8D maximal supergravity with moduli space (SL(3,R)/SO(3))x(SL(2,R)/SO(2)) and study explicitly the attractor mechanism for various configurations of extremal black p-branes (antibranes) with the typical near horizon geometries AdS{sub p+2}xS{sup m}xT{sup 6-p-m} and p=0, 1, 2, 3, 4; 2{<=}m{<=}6. Interpretations in terms of wrapped M2 and M5 branes of the 11D M-theory on 3-torus are also given.

Drissi, L. B [INANOTECH, Institute of Nanomaterials and Nanotechnology (Morocco); Hassani, F. Z; Jehjouh, H. [Lab/UFR-High Energy Physics, Faculty of Science, Rabat (Morocco) and GNPHE; Groupement National de Physique des Hautes Energies (Morocco); Saidi, E. H [INANOTECH, Institute of Nanomaterials and Nanotechnology (Morocco) and Lab/UFR-High Energy Physics; Faculty of Science, Rabat (Morocco); GNPHE, Groupement National de Physique des Hautes Energies (Morocco)

2010-05-15T23:59:59.000Z

363

APPROACH TO EXTREME-SCALE SIMULATION OF NOVEL ARCHITECTURES  

SciTech Connect

We outline an approach for simulating computing architectures applicable to extreme-scale systems (thousands of processors) and to advanced, novel architectural configurations. We believe that simulation is the predictive tool of choice for evaluating the performance of such systems. Our component-based design allows for the seamless assembly of architectures from representations of workload, processor, network interface, switches, etc., with disparate resolutions into an integrated simulation model. This accommodates different case studies that may require different levels of fidelity in various parts of a system. Our initial prototype, comprising low-fidelity models of workload and network, aims to model at least 4096 computational nodes in a fat-tree network. It supports studies of simulation performance and scaling rather than the properties of the simulated system themselves. Future work will allow more realistic simulation and visualization of ASCI-like workloads on very large machines.

Alexander, F. J. (Francis J.); Berkbigler, K. P. (Kathryn P.); Booker, G. (Graham)

2001-01-01T23:59:59.000Z

364

Amplitude variations on the Extreme Adaptive Optics testbed  

Science Conference Proceedings (OSTI)

High-contrast adaptive optics systems, such as those needed to image extrasolar planets, are known to require excellent wavefront control and diffraction suppression. At the Laboratory for Adaptive Optics on the Extreme Adaptive Optics testbed, we have already demonstrated wavefront control of better than 1 nm rms within controllable spatial frequencies. Corresponding contrast measurements, however, are limited by amplitude variations, including those introduced by the micro-electrical-mechanical-systems (MEMS) deformable mirror. Results from experimental measurements and wave optic simulations of amplitude variations on the ExAO testbed are presented. We find systematic intensity variations of about 2% rms, and intensity variations with the MEMS to be 6%. Some errors are introduced by phase and amplitude mixing because the MEMS is not conjugate to the pupil, but independent measurements of MEMS reflectivity suggest that some error is introduced by small non-uniformities in the reflectivity.

Evans, J; Thomas, S; Dillon, D; Gavel, D; Phillion, D; Macintosh, B

2007-08-14T23:59:59.000Z

365

Mid-Infrared Instrumentation for the European Extremely Large Telescope  

E-Print Network (OSTI)

MIDIR is the proposed thermal/mid-IR imager and spectrograph for the European Extremely Large Telescope (E-ELT). It will cover the wavelength range of 3 to at least 20 microns. Designed for diffraction-limited performance over the entire wavelength range, MIDIR will require an adaptive optics system; a cryogenically cooled system could offer optimal performance in the IR, and this is a critical aspect of the instrument design. We present here an overview of the project, including a discussion of MIDIR's science goals and a comparison with other infrared (IR) facilities planned in the next decade; top level requirements derived from these goals are outlined. We describe the optical and mechanical design work carried out in the context of a conceptual design study, and discuss some important issues to emerge from this work, related to the design, operation and calibration of the instrument. The impact of telescope optical design choices on the requirements for the MIDIR instrument is demonstrated.

S. Kendrew; B. Brandl; R. Lenzen; L. Venema; H. U. Käufl; G. Finger; A. Glasse; R. Stuik

2007-08-23T23:59:59.000Z

366

FRONTIER SYNCHROTRON INFRARED SPECTROSCOPY BEAMLINE UNDER EXTREME CONDITIONS (FIS)  

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

FRONTIER SYNCHROTRON INFRARED SPECTROSCOPY FRONTIER SYNCHROTRON INFRARED SPECTROSCOPY BEAMLINE UNDER EXTREME CONDITIONS (FIS) Proposal Team: L. Carr 1 , D. Dolan 2 , R. Hemley 3 , S. Jacobson 4 , S. Karato 5 , Z. Liu 3 , W. Panero 6 , M. Pravica 7 , and T. Zhou 8 1 Brookhaven National Laboratory, 2 Sandia National Laboratories, 3 Carnegie Institution of Washington, 4 Northwestern University, 5 Yale University, 6 Ohio State University, 7 University of Nevada, 8 New Jersey Institute of Technology TECHNIQUES AND CAPABILITIES APPLICATIONS SPECIFIC PROJECTS / ADDITIONAL INFORMATION * TECHNIQUE(S): Fourier transform infrared spectroscopy; Raman and visible spectroscopy; Diamond anvil cell techniques for static high pressure; Gas-gun launchers for dynamic compression; Cryogenic techniques combined with DACs;

367

Accident Investigation Handbook  

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

Improvement (HPI). The recommended techniques apply equally well to DOE Federal-led accident investigations conducted under DOE Order (O) 225.1B, Accident Investigations,...

368

Molecular Hydrogen Emission Lines in Far Ultraviolet Spectroscopic Explorer Observations of Mira B  

E-Print Network (OSTI)

We present new Far Ultraviolet Spectroscopic Explorer (FUSE) observations of Mira A's wind-accreting companion star, Mira B. We find that the strongest lines in the FUSE spectrum are H2 lines fluoresced by H I Lyman-alpha. A previously analyzed Hubble Space Telescope (HST) spectrum also shows numerous Lyman-alpha fluoresced H2 lines. The HST lines are all Lyman band lines, while the FUSE H2 lines are mostly Werner band lines, many of them never before identified in an astrophysical spectrum. We combine the FUSE and HST data to refine estimates of the physical properties of the emitting H2 gas. We find that the emission can be reproduced by an H2 layer with a temperature and column density of T=3900 K and log N(H2)=17.1, respectively. Another similarity between the HST and FUSE data, besides the prevalence of H2 emission, is the surprising weakness of the continuum and high temperature emission lines, suggesting that accretion onto Mira B has weakened dramatically. The UV fluxes observed by HST on 1999 August 2 were previously reported to be over an order of magnitude lower than those observed by HST and the International Ultraviolet Explorer (IUE) from 1979--1995. Analysis of the FUSE data reveals that Mira B was still in a similarly low state on 2001 November 22.

Brian E. Wood; Margarita Karovska

2003-10-03T23:59:59.000Z

369

Ultraviolet Spectra of CV Accretion Disks with Non-Steady T(r) Laws  

E-Print Network (OSTI)

An extensive grid of synthetic mid- and far-ultraviolet spectra for accretion disks in cataclysmic variables has been presented by Wade and Hubeny (1998). In those models, the disk was assumed to be in steady-state, that is T_eff(r) is specified completely by the mass M_WD and radius R_WD of the accreting white dwarf star and the mass transfer rate M_dot which is constant throughout the disk. In these models, T_eff(r) is proportional to r^{-3/4} except as modified by a cutoff term near the white dwarf. Actual disks may vary from the steady-state prescription for T_eff(r), however, e.g. owing to outburst cycles in dwarf novae M_dot not constant with radius) or irradiation (in which case T_eff in the outer disk is raised above T_steady). To show how the spectra of such disks might differ from the steady case, we present a study of the ultraviolet (UV) spectra of models in which power-law temperature profiles T_eff(r) is proportional to r^{-gamma} with gamma < 3/4 are specified. Otherwise, the construction of...

Orosz, J A; Orosz, Jerome A.; Wade, Richard A.

2003-01-01T23:59:59.000Z

370

ABRUPT LONGITUDINAL MAGNETIC FIELD CHANGES AND ULTRAVIOLET EMISSIONS ACCOMPANYING SOLAR FLARES  

Science Conference Proceedings (OSTI)

We have used Transition Region and Coronal Explorer 1600 A images and Global Oscillation Network Group (GONG) magnetograms to compare ultraviolet (UV) emissions from the chromosphere to longitudinal magnetic field changes in the photosphere during four X-class solar flares. An abrupt, significant, and persistent change in the magnetic field occurred across more than 10 pixels in the GONG magnetograms for each flare. These magnetic changes lagged the GOES flare start times in all cases, showing that they were consequences and not causes of the flares. Ultraviolet emissions were spatially coincident with the field changes. The UV emissions tended to lag the GOES start times for the flares and led the changes in the magnetic field in all pixels except one. The UV emissions led the photospheric field changes by 4 minutes on average with the longest lead being 9 minutes; however, the UV emissions continued for tens of minutes, and more than an hour in some cases, after the field changes were complete. The observations are consistent with the picture in which an Alfven wave from the field reconnection site in the corona propagates field changes outward in all directions near the onset of the impulsive phase, including downward through the chromosphere and into the photosphere, causing the photospheric field changes, whereas the chromosphere emits in the UV in the form of flare kernels, ribbons, and sequential chromospheric brightenings during all phases of the flare.

Johnstone, B. M.; Petrie, G. J. D.; Sudol, J. J. [Department of Physics, West Chester University, West Chester, PA 19383 (United States)

2012-11-20T23:59:59.000Z

371

Ultraviolet free-electron laser (uv FEL) facility at Brookhaven National Laboratory  

DOE Green Energy (OSTI)

The proposal for a Ultraviolet Free-Electron Laser Facility UV-FEL grew from the realization that neither existing lasers or synchrotrons, nor the third generation synchrotron radiation sources now under construction address all of the needs of scientists interested in the ultraviolet region of the spectrum, particularly with respect to the combination of continuous wavelength selection, high peak power and short pulse duration. Several workshops have been held at BNL and elsewhere which explored applications and source requirements in the 5 to 30 eV range. A critical requirement determined was is for very high peak power and short wavelength, especially for applications in chemical physics and non-linear optics. The need for wavelength tuning with the ease and agility to which synchrotron radiation users have become accustomed has also been strongly emphasized. With these initial parameters in mind, the accelerator physics staff set about devising ways to produce this radiation. Their design is for an FEL that has unique characteristics both in terms of possible applications, and in the range of radiation it could produce. In addition, the proposed location of the UV-FEL adjacent to the NSLS means that pump-probe experiments involving radiation from both sources will be possible. Each successive design has been reviewed in consultation with potential users in an iterative process to arrive at the present proposal design.

Johnson, E.D.; Sutherland, J.C.

1992-12-31T23:59:59.000Z

372

Ultraviolet free-electron laser (uv FEL) facility at Brookhaven National Laboratory  

DOE Green Energy (OSTI)

The proposal for a Ultraviolet Free-Electron Laser Facility UV-FEL grew from the realization that neither existing lasers or synchrotrons, nor the third generation synchrotron radiation sources now under construction address all of the needs of scientists interested in the ultraviolet region of the spectrum, particularly with respect to the combination of continuous wavelength selection, high peak power and short pulse duration. Several workshops have been held at BNL and elsewhere which explored applications and source requirements in the 5 to 30 eV range. A critical requirement determined was is for very high peak power and short wavelength, especially for applications in chemical physics and non-linear optics. The need for wavelength tuning with the ease and agility to which synchrotron radiation users have become accustomed has also been strongly emphasized. With these initial parameters in mind, the accelerator physics staff set about devising ways to produce this radiation. Their design is for an FEL that has unique characteristics both in terms of possible applications, and in the range of radiation it could produce. In addition, the proposed location of the UV-FEL adjacent to the NSLS means that pump-probe experiments involving radiation from both sources will be possible. Each successive design has been reviewed in consultation with potential users in an iterative process to arrive at the present proposal design.

Johnson, E.D.; Sutherland, J.C.

1992-01-01T23:59:59.000Z

373

Investigations | Department of Energy  

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

Investigations Investigations Investigations Investigations The Office of Investigations performs investigations into allegations of fraud, waste, and abuse in programs and operations of the Department, NNSA and FERC. Priority is given to investigations of suspected violations of criminal and civil statutes, as well as serious administrative misconduct. Particular focus is placed on the prevention and detection of contract and grant fraud; environmental, health and safety violations; computer crimes; and issues that reflect on the integrity and credibility of Department officials. Suspected criminal and civil violations are reported promptly to the Department of Justice for prosecutive consideration. Potential outcomes from such referrals include declination or acceptance for further action,

374

ExM: System Support for Extreme-Scale, Many-Task Applications | Argonne  

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

ExM: System Support for Extreme-Scale, Many-Task Applications ExM: System Support for Extreme-Scale, Many-Task Applications ExM: System Support for Extreme-Scale, Many-Task Applications ExM (Exascale Many-task) focuses on a novel stack of system services that will enable a broader range of applications to be easily developed and efficiently executed on extreme-scale platforms. The ExM middleware stack supports a highly parallel, functional data model that exposes and automates the many levels of execution needed to efficiently leverage extreme-scale computing systems for complex, many-task applications. The goal of the ExM project is to achieve the technical advances required to execute many-task applications efficiently, reliably, and easily on petascale and exascale computers. In this way, extreme-scale computing will

375

NETL: News Release - Data Acquisition Processor Fills Gap for Extreme  

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

9, 2010 9, 2010 Data Acquisition Processor Fills Gap for Extreme Down-hole Conditions Honeywell Develops Unique Reprogrammable High Temperature Device Morgantown, WV - Honeywell International, Inc. has developed a Reconfigurable Processor for Data Acquisition (RPDA) - a reprogrammable, multi-functional device that can operate at temperatures up to 250oC (482oF). The system is housed in a rugged package suitable for deep down-hole oil and natural gas logging and measurement-while-drilling (MWD) operations, and permanent wellbore installation applications. The project was funded through a cooperative agreement with the National Energy Technology Laboratory (NETL) under the Office of Fossil Energy's Oil and Natural Gas Program. Deep wells are generally defined as having a true vertical depth (TVD) greater than 15,000 feet, while ultra-deep wells are deeper than 25,000 feet TVD. Potential recoverable natural gas and oil resources from deep formations are significant, and deep wells tend to produce at much higher daily rates than conventional shallower wells.

376

BAL QSOs and Extreme UFOs: the Eddington connection  

E-Print Network (OSTI)

We suggest a common physical origin connecting the fast, highly ionized winds (UFOs) seen in nearby AGN, and the slower and less ionized winds of BAL QSOs. The primary difference is the mass loss rate in the wind, which is ultimately determined by the rate at which mass is fed towards the central supermassive black hole (SMBH) on large scales. This is below the Eddington accretion rate in most UFOs, and slightly super-Eddington in extreme UFOs such as PG1211+143, but ranges up to $\\sim 10-50$ times this in BAL QSOs. For UFOs this implies black hole accretion rates and wind mass loss rates which are at most comparable to Eddington, giving fast, highly-ionized winds. In contrast BAL QSO black holes have mildly super-Eddington accretion rates, and drive winds whose mass loss rates are significantly super-Eddington, and so are slower and less ionized. This picture correctly predicts the velocities and ionization states of the observed winds, including the recently-discovered one in SDSS J1106+1939. We suggest tha...

Zubovas, Kastytis

2013-01-01T23:59:59.000Z

377

Challenges in optics for Extremely Large Telescope instrumentation  

E-Print Network (OSTI)

We describe and summarize the optical challenges for future instrumentation for Extremely Large Telescopes (ELTs). Knowing the complex instrumental requirements is crucial for the successful design of 30-60m aperture telescopes. After all, the success of ELTs will heavily rely on its instrumentation and this, in turn, will depend on the ability to produce large and ultra-precise optical components like light-weight mirrors, aspheric lenses, segmented filters, and large gratings. New materials and manufacturing processes are currently under study, both at research institutes and in industry. In the present paper, we report on its progress with particular emphasize on volume-phase-holographic gratings, photochromic materials, sintered silicon-carbide mirrors, ion-beam figuring, ultra-precision surfaces, and free-form optics. All are promising technologies opening new degrees of freedom to optical designers. New optronic-mechanical systems will enable efficient use of the very large focal planes. We also provide exploratory descriptions of "old" and "new" optical technologies together with suggestions to instrument designers to overcome some of the challenges placed by ELT instrumentation.

P. Spanò; F. M. Zerbi; C. J. Norrie; C. R. Cunningham; K. G. Strassmeier; A. Bianco; P. A. Blanche; M. Bougoin; M. Ghigo; P. Hartmann; L. Zago; E. Atad-Ettedgui; B. Delabre; H. Dekker; M. Melozzi; B. Snyders; R. Takke; D. D. Walker

2006-03-28T23:59:59.000Z

378

Sources for Low Energy Extreme of Ion Implantation  

SciTech Connect

A joint research and development effort focusing on the design of steady state, intense ion sources has been in progress for the past four and a half years. The ultimate goal is to meet the two, energy extreme range needs of mega-electron-volt and 100's of electron-volt ion implanters. This endeavor has resulted in record steady state output currents of higher charge state Antimony and Phosphorous ions: P{sup 2+}(8.6 pmA), P{sup 3+}(1.9 pmA), and P{sup 4+}(0.12 pmA) and 16.2, 7.6, 3.3, and 2.2 pmA of Sb{sup 3+} Sb{sup 4+}, Sb{sup 5+}, and Sb{sup 6+} respectively. During the past year the effort was channeled towards low energy implantation, for which the effort involved molecular ions and a novel plasmaless/gasless deceleration method. To date, 3 emA of positive Decaborane ions were extracted at 14 keV and a smaller current of negative Decaborane ions were also extracted. Additionally, a Boron fraction of over 70% was extracted from a Bernas-Calutron ion source.

Hershcovitch, A.; Johnson, B. M. [Brookhaven National Laboratory, Upton, New York 11973 (United States); Batalin, V. A.; Kolomiets, A. A.; Kropachev, G. N.; Kuibeda, R. P.; Kulevoy, T. V.; Pershin, V. I.; Petrenko, S. V.; Rudskoy, I.; Seleznev, D. N. [Institute for Theoretical and Experimental Physics, Moscow (Russian Federation); Bugaev, A. S.; Gushenets, V. I.; Oks, E. M.; Yushkov, G. Yu. [High Current Electronics Institute Russian Academy of Sciences, Tomsk, 634055 (Russian Federation); Masunov, E. S.; Polozov, S. M. [Moscow Engineering Physics Institute, Kashirskoe sh. 31, Moscow, 115409 (Russian Federation); Poole, H. J. [PVI, Oxnard, California 93031-5023 (United States); Storozhenko, P. A. [State Research Institute for Chemistry and Technology of Organoelement Compounds 38, sh. Entuziastov, Moscow, 111123 (Russian Federation); Svarovski, A. Ya. [Siberian Divisions of Russian National Research Center 'A.A. Bochvara Scientific Research Institute for Inorganic Materials', Seversk, 636070 (Russian Federation)

2008-11-03T23:59:59.000Z

379

ION SOURCES FOR ENERGY EXTREMES OF ION IMPLANTATION.  

SciTech Connect

For the past four years a joint research and development effort designed to develop steady state, intense ion sources has been in progress with the ultimate goal to develop ion sources and techniques, which meet the two energy extreme range needs of mega-electron-volt and 100's of electron-volt ion implanters. This endeavor has already resulted in record steady state output currents of high charge state of Antimony and Phosphorous ions: P{sup 2+} (8.6 pmA), P{sup 3+} (1.9 pmA), and P{sup 4+} (0.12 pmA) and 16.2, 7.6, 3.3, and 2.2 pmA of Sb{sup 3+} Sb{sup 4+}, Sb{sup 5+}, and Sb{sup 6+} respectively. For low energy ion implantation our efforts involve molecular ions and a novel plasmaless/gasless deceleration method. To date, 1 emA of positive Decaborane ions were extracted at 10 keV and smaller currents of negative Decaborane ions were also extracted. Additionally, Boron current fraction of over 70% was extracted from a Bemas-Calutron ion source, which represents a factor of 3.5 improvement over currently employed ion sources.

HERSCHCOVITCH,A.; JOHNSON, B.M.; BATALIN, V.A.; KROPACHEV, G.N.; KUIBEDA, R.P.; KULEVOY, T.V.; KOLOMIETS, A.A.; PERSHIN, V.I.; PETRENKO, S.V.; RUDSKOY, I.; SELEZNEV, D.N.; BUGAEV, A.S.; GUSHENETS, V.I.; LITOVKO, I.V.; OKS, E.M.; YUSHKOV, G. YU.; MASEUNOV, E.S.; POLOZOV, S.M.; POOLE, H.J.; STOROZHENKO, P.A.; SVAROVSKI, YA.

2007-08-26T23:59:59.000Z

380

Impact of Xe partial pressure on the production of excimer vacuum ultraviolet emission for plasma display panels  

SciTech Connect

In this work, the effect of the Xe partial pressure on the excimer vacuum ultraviolet (VUV) emission intensity of the plasma display panels is investigated, both by measuring the spectral emission directly and by two-dimensional simulations. Experimentally, we find that at the high Xe partial pressure levels, there is an supra-linear increase of excimer VUV radiation and that determines the strong increase of luminance at the high pressures and high voltage. Due to the increase of the luminance and the almost unchanged discharge current, the luminous efficacy strongly increases with the Xe partial pressure. In addition, we also investigated the dynamics of the VUV generation, by measuring the decay time of the excimer VUV light as a function of the gas pressure. It is found that the decay time decreases with the increase of gas pressure. The spatial characteristics of the excimer VUV emission are also discussed. Different from the Ne and near-infrared emission, the excimer VUV emission is generated near the surface of the electrodes and increases uniformly on both sides of the anode and cathode (i.e., the bulk plasma region). Most importantly, it is found that the VUV production occurs during the afterglow period, while it is almost zero at the moment of the discharge itself. From the simulations, it can be seen that the Xe{sub 2}*({sup 3}{Sigma}{sub u}{sup +}) excimer species, which are generated from Xe*(1s{sub 5}), play a dominant role in the excimer VUV emission output at the high Xe partial pressure. The two-dimensional simulations also show that the strong increase of Xe excimer excitation states in the case of high pressure is mainly the result of the high conversion efficiency of the Xe excimer states, especially in the afterglow period. Due to the high conversion efficiency of Xe excitation species to Xe excimer species by the high collision rate in the case of high pressure, there is a strong increase of excimer VUV production, especially from the cathode.

Zhu Di [Display R and D center, School of Electronic Science and Engineering, Southeast University, Nanjing (China); Graduate School of Advanced Science of Matter, Hiroshima University, Higashi-Hiroshima, Hiroshima (Japan); Zhang Xiong [Display R and D center, School of Electronic Science and Engineering, Southeast University, Nanjing (China); Kajiyama, Hiroshi [Graduate School of Advanced Science of Matter, Hiroshima University, Higashi-Hiroshima, Hiroshima (Japan)

2012-08-01T23:59:59.000Z

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


381

Near ultraviolet emission from nonpolar cubic AlxGa1-xN/GaN quantum wells  

E-Print Network (OSTI)

Near ultraviolet emission from nonpolar cubic AlxGa1-xN/GaN quantum wells J. Schörmann,a S and multiple quantum wells. The well widths ranged from 2.5 to 7.5 nm. Samples were grown by rf-plasma assisted wells clear reflection high energy electron diffraction oscillations were observed indicating a two

As, Donat Josef

382

Thin Films for Gas Sensing at Extreme Temperatures and in Harsh ...  

Science Conference Proceedings (OSTI)

Corrosion of Mild Steel in Extreme Oil and Gas Environments · Corrosion ... Fluorescent Nanoparticle Tracers for Oil Exploration and Production · Formation of ...

383

FAQs - NIST WTC Investigation  

Science Conference Proceedings (OSTI)

... The agency received $16 million for the investigation in September 2002 from the federal government's fiscal year 2002 supplemental appropriation ...

2011-09-20T23:59:59.000Z

384

The effects of concentrated ultraviolet light on high-efficiency silicon solar cells  

DOE Green Energy (OSTI)

The importance of stability in the performance of solar cells is clearly recognized as fundamental. Some of the highest efficiency silicon solar cells demonstrated to date, such as the Point Contact solar cell and the Passivated Emitter solar cell, rely upon the passivation of cell surfaces in order to minimize recombination, which reduces cell power output. Recently, it has been shown that exposure to ultraviolet (UV) light of wavelengths present in the terrestrial solar spectrum can damage a passivating silicon-oxide interface and increase recombination. In this study, we compared the performance of Point Contact and Passivated Emitter solar cells after exposure to UV light. We also examined the effect of UV exposure on oxide-passivated silicon wafers. We found that current Passivated Emitter designs are stable at both one-sun and under concentrated sunlight. The evolution of Point Contact concentrator cell performance shows a clear trend towards more stable cells. 15 refs., 18 figs.

Ruby, D.S.; Schubert, W.K.

1991-01-01T23:59:59.000Z

385

Optical data of meteoritic nano-diamonds from far-ultraviolet to far-infrared wavelengths  

E-Print Network (OSTI)

We have used different spectroscopic techniques to obtain a consistent quantitative absorption spectrum of a sample of meteoritic nano-diamonds in the wavelength range from the vacuum ultraviolet (0.12 $\\mu$m) to the far infrared (100 $\\mu$m). The nano-diamonds have been isolated by a chemical treatment from the Allende meteorite (Braatz et al.2000). Electron energy loss spectroscopy (EELS) extends the optical measurements to higher energies and allows the derivation of the optical constants (n & k) by Kramers-Kronig analysis. The results can be used to restrain observations and to improve current models of the environment where the nano-diamonds are expected to have formed. We also show that the amount of nano-diamond which can be present in space is higher than previously estimated by Lewis et al. (1989).

H. Mutschke; A. C. Andersen; C. Jaeger; Th. Henning; A. Braatz

2004-08-10T23:59:59.000Z

386

Ultraviolet laser spectroscopy of neutral mercury in a one-dimensional optical lattice  

Science Conference Proceedings (OSTI)

We present details on the ultraviolet lattice spectroscopy of the (6s{sup 2}) {sup 1}S{sub 0}{r_reversible} (6s6p) {sup 3}P{sub 0} transition in neutral mercury, specifically {sup 199}Hg. Mercury atoms are loaded into a one-dimensional vertically aligned optical lattice from a magneto-optical trap with an rms temperature of {approx}60 {mu}K. We describe aspects of the magneto-optical trapping, the lattice cavity design, and the techniques employed to trap and detect mercury in an optical lattice. The clock-line frequency dependence on lattice depth is measured at a range of lattice wavelengths. We confirm the magic wavelength to be 362.51(0.16) nm. Further observations to those reported by Yi et al.[Phys. Rev. Lett. 106, 073005 (2011)] are presented regarding the laser excitation of a Wannier-Stark ladder of states.

Mejri, S.; McFerran, J. J.; Yi, L.; Le Coq, Y.; Bize, S. [LNE-SYRTE, Observatoire de Paris, CNRS, UPMC, 61 Avenue de l'Observatoire, FR-75014 Paris (France)

2011-09-15T23:59:59.000Z

387

Ultraviolet stimulated electron source for use with low energy plasma instrument calibration  

E-Print Network (OSTI)

We report the development of a versatile, compact, low to medium energy electron source. A collimated, monoenergetic beam of electrons, up to 50 mm in diameter, is produced with energies ranging from 0.03 to 30 keV. A uniform electron beam profile is generated by illuminating a metal cathode plate with a near ultraviolet (UV) light emitting diode (LED). A parallel electric field accelerates the electrons away from the cathode plate towards a grounded grid. The beam intensity can be controlled from 10 - 10^9 electrons cm-2 s-1 and the angular divergence of the beam is less than 1 degree FWHM for energies greater than 1 keV.

Henderson, Kevin; Funsten, Herb; MacDonald, Elizabeth

2011-01-01T23:59:59.000Z

388

Ultraviolet stimulated electron source for use with low energy plasma instrument calibration  

SciTech Connect

We have developed and demonstrated a versatile, compact electron source that can produce a mono-energetic electron beam up to 50 mm in diameter from 0.1 to 30 keV with an energy spread of <10 eV. By illuminating a metal cathode plate with a single near ultraviolet light emitting diode, a spatially uniform electron beam with 15% variation over 1 cm{sup 2} can be generated. A uniform electric field in front of the cathode surface accelerates the electrons into a beam with an angular divergence of <1 Degree-Sign at 1 keV. The beam intensity can be controlled from 10 to 10{sup 9} electrons cm{sup -2} s{sup -1}.

Henderson, Kevin; Harper, Ron; Funsten, Herb; MacDonald, Elizabeth [Space Science and Applications, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

2012-07-15T23:59:59.000Z

389

Cryogenic detector development at LLNL: ultraviolet x-ray, gamma-ray and biomolecule spectroscopy  

SciTech Connect

We are developing low-temperature detectors for optical, ultraviolet, X-ray, and gamma-ray spectroscopy, and for biomolecular mass spectrometry. We present development work on these detectors and materials analysis and biomolecular mass spectrometry. We have measured thin-film Nb/Al/Al2O3/AlNb superconducting tunnel junction (STJ) X-ray detectors in the 0.2 to 1 keV band with a range of different junction sizes and aluminum film thicknesses. In one case, we have achieved the statistical limit to the energy resolution of 13 eV FWHM at 227 eV with an output count rate of 20,600 cts/s.

Labov, S.E.; Frank, M.; le Grand, J.B. [and others

1997-08-12T23:59:59.000Z

390

QUIET-SUN INTENSITY CONTRASTS IN THE NEAR-ULTRAVIOLET AS MEASURED FROM SUNRISE  

SciTech Connect

We present high-resolution images of the Sun in the near-ultraviolet spectral range between 214 nm and 397 nm as obtained from the first science flight of the 1 m SUNRISE balloon-borne solar telescope. The quiet-Sun rms intensity contrasts found in this wavelength range are among the highest values ever obtained for quiet-Sun solar surface structures-up to 32.8% at a wavelength of 214 nm. We compare the rms contrasts obtained from the observational data with theoretical intensity contrasts obtained from numerical magnetohydrodynamic simulations. For 388 nm and 312 nm the observations agree well with the numerical simulations whereas at shorter wavelengths discrepancies between observed and simulated contrasts remain.

Hirzberger, J.; Feller, A.; Riethmueller, T. L.; Schuessler, M.; Borrero, J. M.; Gandorfer, A.; Solanki, S. K.; Barthol, P. [Max-Planck-Institut fuer Sonnensystemforschung, D-37434 Katlenburg-Lindau (Germany); Afram, N.; Unruh, Y. C. [Astrophysics Group, Blackett Laboratory, Imperial College, London SW7 2AZ (United Kingdom); Berdyugina, S. V.; Berkefeld, T.; Schmidt, W. [Kiepenheuer-Institut fuer Sonnenphysik, D-79104 Freiburg (Germany); Bonet, J. A.; MartInez Pillet, V. [Instituto de Astrofisica de Canarias, E-38200 La Laguna (Spain); Knoelker, M. [High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO 80307 (United States); Title, A. M., E-mail: hirzberger@mps.mpg.d [Lockheed Martin Solar and Astrophysics Laboratory, Palo Alto, CA 94305 (United States)

2010-11-10T23:59:59.000Z

391

Ultraviolet Spectra of CV Accretion Disks with Non-Steady T(r) Laws  

E-Print Network (OSTI)

An extensive grid of synthetic mid- and far-ultraviolet spectra for accretion disks in cataclysmic variables has been presented by Wade and Hubeny (1998). In those models, the disk was assumed to be in steady-state, that is T_eff(r) is specified completely by the mass M_WD and radius R_WD of the accreting white dwarf star and the mass transfer rate M_dot which is constant throughout the disk. In these models, T_eff(r) is proportional to r^{-3/4} except as modified by a cutoff term near the white dwarf. Actual disks may vary from the steady-state prescription for T_eff(r), however, e.g. owing to outburst cycles in dwarf novae M_dot not constant with radius) or irradiation (in which case T_eff in the outer disk is raised above T_steady). To show how the spectra of such disks might differ from the steady case, we present a study of the ultraviolet (UV) spectra of models in which power-law temperature profiles T_eff(r) is proportional to r^{-gamma} with gamma grid, to allow comparison. We discuss both the UV spectral energy distributions and the appearance of the UV line spectra. We also briefly discuss the eclipse light curves of the non-standard models. Comparison of these models with UV observations of novalike variables suggests that better agreement may be possible with such modified T_eff(r) profiles.

Jerome A. Orosz; Richard A. Wade

2003-05-20T23:59:59.000Z

392

Detection of Coherent Structures in Extreme-Scale Simulations  

Science Conference Proceedings (OSTI)

The analysis of coherent structures is a common problem in many scientific domains ranging from astrophysics to combustion, fusion, and materials science. The data from three-dimensional simulations are analyzed to detect the structures, extract statistics on them, and track them over time to gain insights into the phenomenon being modeled. This analysis is typically done off-line, using data that have been written out by the simulations. However, the move towards extreme scale architectures, with multi-core processors and graphical processing units, will affect how such analysis is done as it is unlikely that the systems will support the I/O bandwidth required for off-line analysis. Moving the analysis in-situ is a solution only if we know a priori what analysis will be done, as well as the algorithms used and their parameter settings. Even then, we need to ensure that this will not substantially increase the memory requirements or the data movement as the former will be limited and the latter will be expensive. In the Exa-DM project, a collaboration between Lawrence Livermore National Laboratory and University of Minnesota, we are exploring ways in which we can address the conflicting demands of coherent structure analysis of simulation data and the architecture of modern parallel systems, while enabling scientific discovery at the exascale. In this paper, we describe our work in two areas: the in situ implementation of an existing algorithm for coherent structure analysis and the use of graph-based techniques to efficiently compress the data.

Kamath, C; Iverson, J; Kirk, R; Karypis, G

2012-03-24T23:59:59.000Z

393

Extreme learning machine based wind speed estimation and sensorless control for wind turbine power generation system  

Science Conference Proceedings (OSTI)

This paper proposes a precise real-time wind speed estimation method and sensorless control for variable-speed variable-pitch wind turbine power generation system (WTPGS). The wind speed estimation is realized by a nonlinear input-output mapping extreme ... Keywords: Extreme learning machine, Sensorless control, Wind speed estimation, Wind turbine power generation system

Si Wu; Youyi Wang; Shijie Cheng

2013-02-01T23:59:59.000Z

394

Unstructured mesh partition improvement for implicit finite element at extreme scale  

Science Conference Proceedings (OSTI)

Parallel simulations at extreme scale require that the mesh is distributed across a large number of processors with equal work load and minimum inter-part communications. A number of algorithms have been developed to meet these goals and graph/hypergraph-based ... Keywords: Extreme scale, Finite element, Partition improvement, Unstructured mesh

Min Zhou; Onkar Sahni; Ting Xie; Mark S. Shephard; Kenneth E. Jansen

2012-03-01T23:59:59.000Z

395

Memory-conscious collective I/O for extreme scale HPC systems  

Science Conference Proceedings (OSTI)

Upcoming extreme scale platforms are expected to have millions of nodes with hundreds to thousands of small cores for each node. The continuing decrease in memory capacity per core and the increasing disparity between core count and off-chip memory bandwidth ... Keywords: collective I/O, extreme scale system, high performance computing, many-core architecture, parallel I/O

Yin Lu, Yong Chen, Yu Zhuang, Rajeev Thakur

2013-06-01T23:59:59.000Z

396

Extremes of the Indian summer monsoon rainfall, ENSO and equatorial Indian Ocean oscillation  

E-Print Network (OSTI)

Extremes of the Indian summer monsoon rainfall, ENSO and equatorial Indian Ocean oscillation Monsoon Rainfall (ISMR) are linked to El Nin~o and Southern Oscillation (ENSO). We show that large), Extremes of the Indian summer monsoon rainfall, ENSO and equatorial Indian Ocean oscillation, Geophys. Res

Gadgil, Siddhartha

397

Extreme Daily Rainfall Events and Their Impact on Ensemble Forecasts of the Indian Monsoon  

Science Conference Proceedings (OSTI)

The Indian summer monsoon rainfall is the net result of an ensemble of synoptic disturbances, many of which are extremely intense. Sporadic systems often bring extreme amounts of rain over only a few days, which can have sizable impacts on the ...

D. B. Stephenson; K. Rupa Kumar; F. J. Doblas-Reyes; J-F. Royer; F. Chauvin; S. Pezzulli

1999-09-01T23:59:59.000Z

398

Changes in the Extremes of the Climate Simulated by CCC GCM2 under CO2 Doubling  

Science Conference Proceedings (OSTI)

Changes due to CO2 doubling in the extremes of the surface climate as simulated by the second-generation circulation model of the Canadian Centre for Climate Modelling and Analysis are studied in two 20-yr equilibrium simulations. Extreme values ...

Francis W. Zwiers; Viatcheslav V. Kharin

1998-09-01T23:59:59.000Z

399

Organization and Environmental Properties of Extreme-Rain-Producing Mesoscale Convective Systems  

Science Conference Proceedings (OSTI)

This study examines the radar-indicated structures and other features of extreme rain events in the United States over a 3-yr period. A rainfall event is defined as “extreme” when the 24-h precipitation total at one or more stations surpasses the ...

Russ S. Schumacher; Richard H. Johnson

2005-04-01T23:59:59.000Z

400

Discovery of extreme events-related communities in contrasting groups of physical system networks  

Science Conference Proceedings (OSTI)

The latent behavior of a physical system that can exhibit extreme events such as hurricanes or rainfalls, is complex. Recently, a very promising means for studying complex systems has emerged through the concept of complex networks. Networks representing ... Keywords: Community detection, Comparative analysis, Complex network analysis, Extreme event prediction, Network motif detection, Spatio-temporal data mining

Zhengzhang Chen; William Hendrix; Hang Guan; Isaac K. Tetteh; Alok Choudhary; Fredrick Semazzi; Nagiza F. Samatova

2013-09-01T23:59:59.000Z

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


401

Long-Term Trends in Extreme Precipitation Events over the Conterminous United States and Canada  

Science Conference Proceedings (OSTI)

This paper describes the results of an analysis of trends in short duration (1–7 days) extreme precipitation events that have a recurrence interval of 1 yr or longer for stations in the United States and Canada. This definition of extreme ...

Kenneth E. Kunkel; Karen Andsager; David R. Easterling

1999-08-01T23:59:59.000Z

402

Textile - Compressor Trip Investigation  

Science Conference Proceedings (OSTI)

This power quality (PQ) case study presents the investigation of an 800 HP, 4160 volt compressor that has been tripping off at a textile manufacturing facility.

2003-12-31T23:59:59.000Z

403

How Do You Stay Warm While Saving Money and Energy in Extreme Weather? |  

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

How Do You Stay Warm While Saving Money and Energy in Extreme How Do You Stay Warm While Saving Money and Energy in Extreme Weather? How Do You Stay Warm While Saving Money and Energy in Extreme Weather? February 3, 2011 - 6:30am Addthis Many states are getting extreme weather this week, with deep freezes, huge blizzards, and ice storms causing various problems across the country. Such weather can cause us to use energy a bit differently to stay warm and keep things running. Depending on where you are, you may be keeping the faucet dripping (so pipes don't freeze), your furnace might be working overtime in the cold, or you may be spending extra time warming up your car. In extreme conditions, it's important to be safe and take your own home and needs into account when taking these extra measures, while still considering your energy use and costs. For example, are your pipes in a

404

How Do You Stay Warm While Saving Money and Energy in Extreme Weather? |  

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

Warm While Saving Money and Energy in Extreme Warm While Saving Money and Energy in Extreme Weather? How Do You Stay Warm While Saving Money and Energy in Extreme Weather? February 3, 2011 - 6:30am Addthis Many states are getting extreme weather this week, with deep freezes, huge blizzards, and ice storms causing various problems across the country. Such weather can cause us to use energy a bit differently to stay warm and keep things running. Depending on where you are, you may be keeping the faucet dripping (so pipes don't freeze), your furnace might be working overtime in the cold, or you may be spending extra time warming up your car. In extreme conditions, it's important to be safe and take your own home and needs into account when taking these extra measures, while still considering your energy use and costs. For example, are your pipes in a

405

Matter in Extreme Conditions Instrument - Conceptual Design Report  

Science Conference Proceedings (OSTI)

The SLAC National Accelerator Laboratory (SLAC), in collaboration with Argonne National Laboratory (ANL), Lawrence Livermore National Laboratory (LLNL), and the University of California at Los Angeles (UCLA), is constructing a Free-Electron Laser (FEL) research facility. The FEL has already met its performance goals in the wavelength range 1.5 nm - 0.15 nm. This facility, the Linac Coherent Light Source (LCLS), utilizes the SLAC 2-Mile Linear Accelerator (linac) and will produce sub-picosecond pulses of short wavelength X-rays with very high peak brightness and almost complete transverse coherence. The final one-third of the SLAC linac is used as the source of electrons for the LCLS. The high energy electrons are transported across the SLAC Research Yard, into a tunnel which houses a long undulator. In passing through the undulator, the electrons are bunched by the force of their own synchrotron radiation and produce an intense, monochromatic, spatially coherent beam of X-rays. By varying the electron energy, the FEL X-ray wavelength is tunable from 1.5 nm to 0.15 nm. The LCLS includes two experimental halls as well as X-ray optics and infrastructure necessary to create a facility that can be developed for research in a variety of disciplines such as atomic physics, materials science, plasma physics and biosciences. This Conceptual Design Report, the authors believe, confirms the feasibility of designing and constructing an X-ray instrument in order to exploit the unique scientific capability of LCLS by creating extreme conditions and study the behavior of plasma under those controlled conditions. This instrument will address the Office of Science, Fusion Energy Sciences, mission objective related to study of Plasma and Warm Dense Matter as described in the report titled LCLS, the First Experiments, prepared by the LCLS Scientific Advisory Committee (SAC) in September 2000. The technical objective of the LCLS Matter in Extreme Conditions (MEC) Instrument project is to design, build, and install at the LCLS an X-ray instrument that will complement the initial instrument suite included in the LCLS construction and the LUSI Major Item of Equipment (MIE) Instruments. As the science programs advance and new technological challenges appear, instrumentation must be developed and ready to conquer these new opportunities. The MEC concept has been developed in close consultation with the scientific community through a series of workshops team meetings and focused reviews. In particular, the MEC instrument has been identified as meeting one of the most urgent needs of the scientific community based on the advice of the LCLS Scientific Advisory Committee (SAC) in response to an open call for letters of intent (LOI) from the breadth of the scientific community. The primary purpose of the MEC instrument is to create High Energy Density (HED) matter and measure its physical properties. There are three primary elements of the MEC instrument: (A) Optical laser drivers that will create HED states by irradiation in several ways and provide diagnostics capability; (B) The LCLS x-ray free electron laser, which will provide the unique capability to create, probe and selectively pump HED states; and, (C) A suite of diagnostic devices required to observe the evolution of the HED state. These elements when combined in the MEC instrument meet the 'Mission Need' as defined in CD-0. For the purposes of the description we separate the types of experiments to be performed into three categories: (1) High pressure: Here we are interested in the generation of high pressure using the optical lasers to irradiate a surface that ablates and drives a pressure wave into a sample, similar to a piston. The pressures that can be reached exceed 1 Mbar and the properties of interest are for example, the reflectivity, conductivity, opacity as well as the changes driven by the pressure wave on, e.g., condensed matter structure. These phenomena will be studied by means of diffraction measurements, measurements of the pressure wave characteristics, in situ probing by

Boyce, R.F.; Boyce, R.M.; Haller, G.; Hastings, J.B.; Hays, G.; Lee, H.J.; /SLAC; Lee, R.W.; /LLNL, Livermore; Nagler, B.; /Rutherford; Scharfenstein, M.; Marsh, D.; White, W.E.; /SLAC

2009-12-09T23:59:59.000Z

406

A Novel Integration of an Ultraviolet Nitrate Sensor On Board a Towed Vehicle for Mapping Open-Ocean Submesoscale Nitrate Variability  

Science Conference Proceedings (OSTI)

Initial results from a deployment of the SUV-6 ultraviolet spectrophotometer, integrated with the SeaSoar towed vehicle, are presented. The innovative, combined system measures nitrate concentration at high spatial resolution (4 m vertically, 5 ...

Rosalind Pidcock; Meric Srokosz; John Allen; Mark Hartman; Stuart Painter; Matt Mowlem; David Hydes; Adrian Martin

2010-08-01T23:59:59.000Z

407

Long-term nitrate measurements in the ocean using the In Situ Ultraviolet Spectrophotometer: sensor integration into the Apex profiling float  

Science Conference Proceedings (OSTI)

Reagent-free, optical nitrate sensors (ISUS: In Situ Ultraviolet Spectrophotometer) can be used to detect nitrate throughout most of the ocean. Although the sensor is a relatively high power device when operated continuously (7.5 W typical), the ...

Kenneth S. Johnson; Luke J. Coletti; Hans W. Jannasch; Carole M. Sakamoto; Dana D. Swift; Stephen C. Riser

408

Intensity, duration, and frequency of precipitation extremes under 21st-century warming scenarios  

Science Conference Proceedings (OSTI)

Recent research on the projection of precipitation extremes has either focused on conceptual physical mechanisms that generate heavy precipitation or rigorous statistical methods that extrapolate tail behavior. However, informing both climate prediction and impact assessment requires concurrent physically and statistically oriented analysis. A combined examination of climate model simulations and observation-based reanalysis data sets suggests more intense and frequent precipitation extremes under 21st-century warming scenarios. Utilization of statistical extreme value theory and resampling-based uncertainty quantification combined with consideration of the Clausius-Clapeyron relationship reveals consistently intensifying trends for precipitation extremes at a global-average scale. However, regional and decadal analyses reveal specific discrepancies in the physical mechanisms governing precipitation extremes, as well as their statistical trends, especially in the tropics. The intensifying trend of precipitation extremes has quantifiable impacts on intensity-duration-frequency curves, which in turn have direct implications for hydraulic engineering design and water-resources management. The larger uncertainties at regional and decadal scales suggest the need for caution during regional-scale adaptation or preparedness decisions. Future research needs to explore the possibility of uncertainty reduction through higher resolution global climate models, statistical or dynamical downscaling, as well as improved understanding of precipitation extremes processes.

Kao, Shih-Chieh [ORNL; Ganguly, Auroop R [ORNL

2011-01-01T23:59:59.000Z

409

Investigator Title Technology  

E-Print Network (OSTI)

Principal Investigator Title Technology Sector State Funds Expended Cost Share Expended Jobs,000 1 Schanbacher, Floyd Development and Commercialization of an integrated Biomass to Electricity Funds Expended Cost Share Expended Jobs Created Average Salary Leverage: Federal $ Leverage: State

410

Modelling the ultraviolet/submillimeter spectral energy distributions of normal galaxies  

E-Print Network (OSTI)

We give an overview of the factors shaping the ultraviolet (UV)/optical - far-infrared (FIR)/submillimeter (submm) spectral energy distributions (SEDs) of normal (non-starburst) galaxies. Particular emphasis is placed on the influen ce of the geometry of dust and stars on the propagation of light through the int erstellar medium. Although strong constraints can be placed on the amount and la rge scale distribution of dust in disks from the appearance of the galaxies in t he optical/UV range, this dust does not account for the observed amplitude and c olour of the FIR/submm radiation. Additional, optically thick components of dust associated with the young stellar population on large and small scales are requ ired to account for the complete UV/optical - FIR/submm SEDs. Self-consistent mo dels for the calculation of SEDs of spiral galaxies are reviewed, and their pred ictions for the dust emission and the attenuation of starlight are compared and contrasted.

Cristina C. Popescu; Richard J. Tuffs

2005-02-10T23:59:59.000Z

411

Resonantly enhanced method for generation of tunable, coherent vacuum ultraviolet radiation  

SciTech Connect

Carbon Monoxide vapor is used to generate coherent, tunable vacuum ultraviolet radiation by third-harmonic generation using a single tunable dye laser. The presence of a nearby electronic level resonantly enhances the nonlinear susceptibility of this molecule allowing efficient generation of the vuv light at modest pump laser intensities, thereby reducing the importance of a six-photon multiple-photon ionization process which is also resonantly enhanced by the same electronic level but to higher order. By choosing the pump radiation wavelength to be of shorter wavelength than individual vibronic levels used to extend tunability stepwise from 154.4 to 124.6 nm, and the intensity to be low enough, multiple-photon ionization can be eliminated. Excitation spectra of the third-harmonic emission output exhibit shifts to shorter wavelength and broadening with increasing CO pressure due to phase matching effects. Increasing the carbon monoxide pressure, therefore, allows the substantial filling in of gaps arising from the stepwise tuning thereby providing almost continuous tunability over the quoted range of wavelength emitted.

Glownia, James H. (Los Alamos, NM); Sander, Robert K. (Los Alamos, NM)

1985-01-01T23:59:59.000Z

412

Ultraviolet photodissociation of iodine monochloride (ICl) at 235, 250, and 265 nm  

SciTech Connect

ICl photolysis in the ultraviolet region of the spectrum (235-265 nm) is studied using the Slice Imaging technique. The Cl*({sup 2}P{sub 1/2})/Cl({sup 2}P{sub 3/2}) and the I*({sup 2}P{sub 1/2})/I({sup 2}P{sub 3/2}) branching ratio between the I({sup 2}P{sub 3/2}) + Cl({sup 2}P{sub 3/2})/Cl*({sup 2}P{sub 1/2}) and I*({sup 2}P{sub 1/2}) + Cl({sup 2}P{sub 3/2})/Cl*({sup 2}P{sub 1/2}) channels is extracted from the respective iodine and chlorine photofragment images. We find that ground state chlorine atoms (Cl({sup 2}P{sub 3/2})) are formed nearly exclusively with excited state iodine atoms (I*({sup 2}P{sub 1/2})), while excited spin-orbit chlorine atoms (Cl*({sup 2}P{sub 1/2})) are concurrently produced only with ground state iodine atoms (I({sup 2}P{sub 3/2})). We conclude that photolysis of ICl in this UV region is a relatively ''clean'' source of spin-orbit excited chlorine atoms that can be used in crossed molecular beam experiments.

Diamantopoulou, N.; Kitsopoulos, Theofanis N. [Institute of Electronic Structure and Laser, Foundation of Research and Technology Hellas, Iraklion 71110 (Greece); Department of Chemistry, University of Crete, Iraklion 71003 (Greece); Kartakoulis, A.; Glodic, P.; Samartzis, Peter C. [Institute of Electronic Structure and Laser, Foundation of Research and Technology Hellas, Iraklion 71110 (Greece)

2011-05-21T23:59:59.000Z

413

NF-kB activation by ultraviolet light not dependent on a nuclear signal  

Science Conference Proceedings (OSTI)

Exposure of mammalian cells to radiation triggers the ultraviolet (UV) response, which includes activation of activator protein-1 (AP-1) and nuclear factor kappa B (NF-kB). This was postulated to occur by induction of a nuclear signaling cascade by damaged DNA. Recently, induction of AP-1 by UV was shown to be mediated by a pathway involving Src tyrosine kinases and the Ha-Ras small guanosine triphosphate-binding protein, proteins located at the plasma membrane. It is demonstrated here that the same pathway mediates induction of NF-kB by UV. Because inactive NF-kB is stored in the cytosol, analysis of its activation directly tests the involvement of a nuclear-initiated signaling cascade. Enucleated cells are fully responsive to UV both in NF-kB induction and in activation of another key signaling event. Therefore, the UV response does not require a signal generated in the nucleus and is likely to be initiated at or near the plasma membrane.

Devary, Y.; Rosette, C.; DiDonato, J.A.; Karin, M. (Univ. of California, San Diego, CA (United States))

1993-09-10T23:59:59.000Z

414

Effective photoelectric converters of ultraviolet radiation with graded-gap ZnS-based layers  

SciTech Connect

The use of ultrathin ({approx}10 nm) stable p-Cu{sub 1.8}S films as a transparent component of the p-Cu{sub 1.8}S-n-ZnS heterojunction as well as of the graded-gap layers made it possible to obtain effective photoconverters of ultraviolet radiation. The results of examination of the properties of photoactive Cu{sub 1.8}S-ZnS junctions grown on the CdS or CdSe substrates with intermediate graded-gap layers CdS-Zn{sub x}Cd{sub 1-x}S or CdSe-(ZnS){sub x}(CdSe){sub 1-} {sub x}, respectively, are presented. With the correct selection of parameters of the substrates, the graded-gap layers allows one to attain the optimal characteristics of the p-n junction, to realize high electric fields at the Cu{sub 1.8}S-ZnS contact, and to solve the problem of fabrication of the back ohmic contact to ZnS without additional doping of all components of the heterostructure with a foreign impurity. Varying the thickness of a thin ZnS layer, it is possible to control the extension of the space charge in the graded-gap layer and thereby to control the long-wavelength edge of photoconverter sensitivity.

Bobrenko, Yu. N.; Pavelets, S. Yu., E-mail: pavelets@voliacable.com; Pavelets, A. M. [National Academy of Sciences of Ukraine, Lashkarev Institute of Semiconductor Physics (Ukraine)

2009-06-15T23:59:59.000Z

415

SURFACE LAYER ACCRETION IN CONVENTIONAL AND TRANSITIONAL DISKS DRIVEN BY FAR-ULTRAVIOLET IONIZATION  

Science Conference Proceedings (OSTI)

Whether protoplanetary disks accrete at observationally significant rates by the magnetorotational instability (MRI) depends on how well ionized they are. Disk surface layers ionized by stellar X-rays are susceptible to charge neutralization by small condensates, ranging from {approx}0.01 {mu}m sized grains to angstrom-sized polycyclic aromatic hydrocarbons (PAHs). Ion densities in X-ray-irradiated surfaces are so low that ambipolar diffusion weakens the MRI. Here we show that ionization by stellar far-ultraviolet (FUV) radiation enables full-blown MRI turbulence in disk surface layers. Far-UV ionization of atomic carbon and sulfur produces a plasma so dense that it is immune to ion recombination on grains and PAHs. The FUV-ionized layer, of thickness 0.01-0.1 g cm{sup -2}, behaves in the ideal magnetohydrodynamic limit and can accrete at observationally significant rates at radii {approx}> 1-10 AU. Surface layer accretion driven by FUV ionization can reproduce the trend of increasing accretion rate with increasing hole size seen in transitional disks. At radii {approx}<1-10 AU, FUV-ionized surface layers cannot sustain the accretion rates generated at larger distance, and unless turbulent mixing of plasma can thicken the MRI-active layer, an additional means of transport is needed. In the case of transitional disks, it could be provided by planets.

Perez-Becker, Daniel [Department of Physics, University of California, Berkeley, CA 94720 (United States); Chiang, Eugene [Departments of Astronomy and Earth and Planetary Science, University of California, Berkeley, CA 94720 (United States)

2011-07-01T23:59:59.000Z

416

Tunnel-injection GaN quantum dot ultraviolet light-emitting diodes  

SciTech Connect

We demonstrate a GaN quantum dot ultraviolet light-emitting diode that uses tunnel injection of carriers through AlN barriers into the active region. The quantum dot heterostructure is grown by molecular beam epitaxy on AlN templates. The large lattice mismatch between GaN and AlN favors the formation of GaN quantum dots in the Stranski-Krastanov growth mode. Carrier injection by tunneling can mitigate losses incurred in hot-carrier injection in light emitting heterostructures. To achieve tunnel injection, relatively low composition AlGaN is used for n- and p-type layers to simultaneously take advantage of effective band alignment and efficient doping. The small height of the quantum dots results in short-wavelength emission and are simultaneously an effective tool to fight the reduction of oscillator strength from quantum-confined Stark effect due to polarization fields. The strong quantum confinement results in room-temperature electroluminescence peaks at 261 and 340 nm, well above the 365 nm bandgap of bulk GaN. The demonstration opens the doorway to exploit many varied features of quantum dot physics to realize high-efficiency short-wavelength light sources.

Verma, Jai; Kandaswamy, Prem Kumar; Protasenko, Vladimir; Verma, Amit; Grace Xing, Huili; Jena, Debdeep [Department of Electrical Engineering, University of Notre Dame, Indiana 46556 (United States)] [Department of Electrical Engineering, University of Notre Dame, Indiana 46556 (United States)

2013-01-28T23:59:59.000Z

417

FAR-ULTRAVIOLET OBSERVATION OF THE AQUILA RIFT WITH FIMS/SPEAR  

Science Conference Proceedings (OSTI)

We present the results of far ultraviolet (FUV) observations of the broad region around the Aquila Rift including the Galactic plane. As compared with various wavelength data sets, dust scattering is found to be the major origin of the diffuse FUV continuum in this region. The FUV intensity clearly correlates with the dust extinction level for E(B - V) 0.2 due to heavy dust extinction combined with the effect of nonuniform interstellar radiation fields. The FUV intensity also correlates well with H{alpha} intensity, implying that at least some fraction of the observed H{alpha} emission could be the dust-scattered light of H{alpha} photons originating elsewhere in the Galaxy. Most of the Aquila Rift region is seen devoid of diffuse FUV continuum due to heavy extinction while strong emission is observed in the surrounding regions. Molecular hydrogen fluorescent emission lines are clearly seen in the spectrum of 'Aquila-Serpens', while 'Aquila-East' does not show any apparent line features. CO emission intensity is also found to be higher in the 'Aquila-Serpens' region than in the 'Aquila-East' region. In this regard, we note that regions of star formation have been found in 'Aquila-Serpens' but not in 'Aquila-East'.

Park, S.-J.; Min, K.-W. [Korea Advanced Institute of Science and Technology, Daejeon 305-701 (Korea, Republic of); Seon, K.-I.; Han, W.; Lee, D.-H. [Korea Astronomy and Space Science Institute, Daejeon 305-348 (Korea, Republic of); Edelstein, J., E-mail: einpark75@kaist.ac.kr [Space Sciences Laboratory, University of California, Berkeley, CA 94720 (United States)

2012-07-20T23:59:59.000Z

418

EVOLUTION OF X-RAY AND FAR-ULTRAVIOLET DISK-DISPERSING RADIATION FIELDS  

Science Conference Proceedings (OSTI)

We present new X-ray and far-ultraviolet (FUV) observations of T Tauri stars covering the age range 1-10 Myr. Our goals are to observationally constrain the intensity of radiation fields responsible for evaporating gas from the circumstellar disk and to assess the feasibility of current photoevaporation models, focusing on X-ray and UV radiation. We greatly increase the number of 7-10 Myr old T Tauri stars observed in X-rays by including observations of the well-populated 25 Ori aggregate in the Orion OB1a subassociation. With these new 7-10 Myr objects, we confirm that X-ray emission remains constant from 1 to 10 Myr. We also show, for the first time, observational evidence for the evolution of FUV radiation fields with a sample of 56 accreting and non-accreting young stars spanning 1 Myr to 1 Gyr. We find that the FUV emission decreases on timescales consistent with the decline of accretion in classical T Tauri stars until reaching the chromospheric level in weak T Tauri stars and debris disks. Overall, we find that the observed strength of high-energy radiation is consistent with that required by photoevaporation models to dissipate the disks in timescales of approximately 10 Myr. Finally, we find that the high-energy fields that affect gas evolution are not similarly affecting dust evolution; in particular, we find that disks with inner clearings, transitional disks, have similar levels of FUV emission as full disks.

Ingleby, Laura; Calvet, Nuria; Miller, Jon; Bergin, Edwin; Hartmann, Lee [Department of Astronomy, University of Michigan, 830 Dennison Building, 500 Church Street, Ann Arbor, MI 48109 (United States); Hernandez, Jesus; Briceno, Cesar [Centro de Investigaciones de Astronomia (CIDA), Merida, 5101-A (Venezuela, Bolivarian Republic of); Espaillat, Catherine, E-mail: lingleby@umich.edu, E-mail: ncalvet@umich.edu, E-mail: jonmm@umich.edu, E-mail: ebergin@umich.edu, E-mail: lhartm@umich.edu, E-mail: jesush@cida.ve, E-mail: briceno@cida.ve, E-mail: cespaillat@cfa.harvard.edu [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, MS-78, Cambridge, MA 02138 (United States)

2011-04-15T23:59:59.000Z

419

Internal Energies of Ion-Sputtered Neutral Tryptophan and Thymine Molecules Determined by Vacuum Ultraviolet Photoionization  

SciTech Connect

Vacuum ultraviolet photoionization coupled to secondary neutral mass spectrometry (VUV-SNMS) of deposited tryptophan and thymine films are performed at the Chemical Dynamics Beamline. The resulting mass spectra show that while the intensity of the VUV-SNMS signal is lower than the corresponding secondary ion mass spectroscopy (SIMS) signal, the mass spectra are significantly simplified in VUV-SNMS. A detailed examination of tryptophan and thymine neutral molecules sputtered by 25 keV Bi3 + indicates that the ion-sputtered parent molecules have ~;;2.5 eV of internal energy. While this internal energy shifts the appearance energy of the photofragment ions for both tryptophan and thymine, it does not change the characteristic photoionizaton efficiency (PIE) curves of thymine versus photon energy. Further analysis of the mass spectral signals indicate that approximately 80 neutral thymine molecules and 400 tryptophan molecules are sputtered per incident Bi3 + ion. The simplified mass spectra and significant characteristic ion contributions to the VUV-SNMS spectra indicate the potential power of the technique for organic molecule surface analysis.

Zhou, Jia; Takahashi, Lynelle; Wilson, Kevin R.; Leone, Stephen R.; Ahmed, Musahid

2010-03-11T23:59:59.000Z

420

Infrared and ultraviolet cutoffs in variational calculations with a harmonic oscillator basis  

E-Print Network (OSTI)

I abstract from a recent publication [1] the motivations for, analysis in and conclusions of a study of the ultraviolet and infrared momentum regulators induced by the necessary truncation of the model spaces formed by a variational trial wave function. This trial function is built systematically from a complete set of many-body basis states based upon three-dimensional harmonic oscillator (HO) functions. Each model space is defined by a truncation of the expansion characterized by a counting number (N) and by the intrinsic scale ($\\hbar\\omega$) of the HO basis. Extending both the uv cutoff to infinity and the ir cutoff to zero is prescribed for a converged calculation. In [1] we established practical procedures which utilize these regulators to obtain the extrapolated result from sequences of calculations with model spaces. Finally, I update this subject by mentioning recent work on our extrapolation prescriptions which have appeared since the submission of [1]. The numerical example chosen for this contribution consists of calculations of the ground state energy of the triton with the "bare" and "soft" Idaho N3LO nucleon-nucleon (NN) interaction.

Sidney A Coon

2013-03-26T23:59:59.000Z

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


421

Extreme solid state refrigeration using nanostructured Bi-Te alloys.  

SciTech Connect

Materials are desperately needed for cryogenic solid state refrigeration. We have investigated nanostructured Bi-Te alloys for their potential use in Ettingshausen refrigeration to liquid nitrogen temperatures. These alloys form alternating layers of Bi{sub 2} and Bi{sub 2}Te{sub 3} blocks in equilibrium. The composition Bi{sub 4}Te{sub 3} was identified as having the greatest potential for having a high Ettingshausen figure of merit. Both single crystal and polycrystalline forms of this material were synthesized. After evaluating the Ettingshausen figure of merit for a large, high quality polycrystal, we simulated the limits of practical refrigeration in this material from 200 to 77 K using a simple device model. The band structure was also computed and compared to experiments. We discuss the crystal growth, transport physics, and practical refrigeration potential of Bi-Te alloys.

Lima Sharma, Ana L. (San Jose State University, San Jose, CA); Spataru, Dan Catalin; Medlin, Douglas L.; Sharma, Peter Anand; Morales, Alfredo Martin

2009-09-01T23:59:59.000Z

422

Secretary Chu to Appear This Sunday on ABC's Extreme Makeover: Home Edition  

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

Chu to Appear This Sunday on ABC's Extreme Makeover: Home Chu to Appear This Sunday on ABC's Extreme Makeover: Home Edition Secretary Chu to Appear This Sunday on ABC's Extreme Makeover: Home Edition February 12, 2010 - 12:00am Addthis Washington - This Sunday, February 14th, Energy Secretary Steven Chu will appear on the show Extreme Makeover: Home Edition. The Department of Energy and Oak Ridge National Laboratory worked with the builders to offer technical assistance as they designed and built a super high efficiency home and a neighborhood learning center in the Washington, D.C area. The builders used the latest "green" technologies, including an insulated concrete form foundation, triple-layer insulated windows, hybrid electric water heaters and a geothermal heat pump, compact fluorescent lighting, and

423

Mid-Twenty-First-Century Changes in Extreme Events over Northern and Tropical Africa  

Science Conference Proceedings (OSTI)

Changes in rainfall and temperature extremes are predicted by many global climate models as a response to greenhouse gas increases, and such changes will have significant environmental and social impacts. A regional climate model is used to ...

Edward K. Vizy; Kerry H. Cook

2012-09-01T23:59:59.000Z

424

'Science on Saturday' lecture examines the extreme X-ray universe  

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

Printer-friendly NASA's NuSTAR spacecraft. "The Extreme X-ray Universe: Discovery Science with NASA's NuSTAR Mission," by Lab scientists Michael Pivovaroff and Bill Craig, and...

425

Extreme Events and the General Circulation: Observations and Stochastic Model Dynamics  

Science Conference Proceedings (OSTI)

This study explores the dynamical role of non-Gaussian potential vorticity variability (extreme events) in the zonally averaged circulation of the atmosphere within a stochastic framework. First the zonally averaged skewness and kurtosis patterns ...

Philip Sura; Maxime Perron

2010-09-01T23:59:59.000Z

426

Monitoring and Understanding Changes in Extremes: Extratropical Storms, Winds, and Waves  

Science Conference Proceedings (OSTI)

This scientific assessment examines changes in three climate extremes (extratropical storms, winds, and waves), with an emphasis on U.S. coastal regions during the cold season. There is moderate evidence of an increase in both extratropical storm ...

Russell S. Vose; Scott Applequist; Mark A. Bourassa; Sara C. Pryor; Rebecca J. Barthelmie; Brian Blanton; Peter D. Bromirski; Harold E. Brooks; Arthur T. DeGaetano; Randall M. Dole; David R. Easterling; Robert E. Jensen; Thomas R. Karl; Richard W. Katz; Katherine Klink; Michael C. Kruk; Kenneth E. Kunkel; Michael C. MacCracken; Thomas C. Peterson; Karsten Shein; Bridget R. Thomas; John E. Walsh; Xiaolan L. Wang; Michael F. Wehner; Donald J. Wuebbles; Robert S. Young

427

Changes of Extreme Wave Heights in Northern Hemisphere Oceans and Related Atmospheric Circulation Regimes  

Science Conference Proceedings (OSTI)

This study assesses trends in seasonal extremes (90- and 99-percentiles) of Significant Wave Height (SWH) in the North Atlantic and the North Pacific, as simulated in a 40-yr global wave hindcast using the National Centers for Environmental ...

Xiaolan L. Wang; Val R. Swail

2001-05-01T23:59:59.000Z

428

How Well Do Large-Scale Models Reproduce Regional Hydrological Extremes in Europe?  

Science Conference Proceedings (OSTI)

This paper presents a new methodology for assessing the ability of gridded hydrological models to reproduce large-scale hydrological high and low flow events (as a proxy for hydrological extremes) as described by catalogues of historical droughts [...

Christel Prudhomme; Simon Parry; Jamie Hannaford; Douglas B. Clark; Stefan Hagemann; Frank Voss

2011-12-01T23:59:59.000Z

429

The Hydrometeorological Environment of Extreme Rainstorms in the Southern Plains of the United States  

Science Conference Proceedings (OSTI)

Convective storms are commonplace in the southern plains of the United States. Occasionally, convective storms produce extreme rainfall accumulations, causing streams and rivers to flood. In this paper, we examine the hydrometeorological ...

A. Allen Bradley; James A. Smith

1994-12-01T23:59:59.000Z

430

The Southern Oscillation in the Australian Region. Part I: Anomalies at the Extremes of the Oscillation  

Science Conference Proceedings (OSTI)

The response of the tropospheric circulation over Australia and the southwest Pacific to extremes of the Southern Oscillation is documented using correlation, regression, and compositing techniques applied to seasonal means of rawinsonde station ...

Wasyl Drosdowsky; Mark Williams

1991-06-01T23:59:59.000Z

431

Projected Changes in Mean and Extreme Precipitation in Africa under Global Warming. Part II: East Africa  

Science Conference Proceedings (OSTI)

Probable changes in mean and extreme precipitation in East Africa are estimated from general circulation models (GCMs) prepared for the Intergovernmental Panel on Climate Change Fourth Assessment Report (AR4). Bayesian statistics are used to ...

Mxolisi E. Shongwe; Geert Jan van Oldenborgh; Bart van den Hurk; Maarten van Aalst

2011-07-01T23:59:59.000Z

432

Effects of Recent Weather Extremes on the Insurance Industry: Major Implications for the Atmospheric Sciences  

Science Conference Proceedings (OSTI)

Frequent and extremely damaging severe weather conditions in the United States during 1991–94 caused $40 billion in insured losses, creating major impacts and eliciting diverse responses in the weather insurance industry. Population, one reason ...

Stanley A. Changnon; David Changnon; E. Ray Fosse; Donald C. Hoganson; Richard J. Roth Sr.; James M. Totsch

1997-03-01T23:59:59.000Z

433

Extreme Cold Winter Temperatures in Europe under the Influence of North Atlantic Atmospheric Blocking  

Science Conference Proceedings (OSTI)

North Atlantic atmospheric blocking conditions explain part of the winter climate variability in Europe, being associated with anomalous cold winter temperatures. In this study, the generalized extreme value (GEV) distribution is fitted to monthly ...

Jana Sillmann; Mischa Croci-Maspoli; Malaak Kallache; Richard W. Katz

2011-11-01T23:59:59.000Z

434

Long-Term Temporal Variation of Extreme Rainfall Events in Australia: 1910–2006  

Science Conference Proceedings (OSTI)

The temporal variability of the frequency of short-duration extreme precipitation events in Australia for the period 1910–2006 is examined using the high-quality rainfall dataset identified by the Bureau of Meteorology, Australia, for 189 ...

Guobin Fu; Neil R. Viney; Stephen P. Charles; Jianrong Liu

2010-08-01T23:59:59.000Z

435

Evaluation of IRI’s Seasonal Climate Forecasts for the Extreme 15% Tails  

Science Conference Proceedings (OSTI)

This paper evaluates the quality of real-time seasonal probabilistic forecasts of the extreme 15% tails of the climatological distribution of temperature and precipitation issued by the International Research Institute for Climate and Society (IRI)...

Anthony G. Barnston; Simon J. Mason

2011-08-01T23:59:59.000Z

436

Extreme rainfall intensities and long-term rainfall risk from tropical cyclones  

E-Print Network (OSTI)

We develop a methodology for the frequency of extreme rainfall intensities caused by tropical cyclones (TCs) in coastal areas. The mean rainfall field associated with a TC with maximum tangential wind speed Vmax, radius ...

Langousis, Andreas, 1981-

2009-01-01T23:59:59.000Z

437

Combining eXtreme Programming with ISO 9000:2000 to Improve Nigerian Software Development Processes.  

E-Print Network (OSTI)

??The aim of this research work is to study how eXtreme programming could be combined with ISO 9000:2000 standards to improve Nigerian software development processes.… (more)

Erharuyi, Edison

2007-01-01T23:59:59.000Z

438

Changes in the Frequency of Different Categories of Temperature Extremes in India  

Science Conference Proceedings (OSTI)

In the context of climate change and its impact on sectors like agriculture and health, it is important to examine the changes in the characteristics of temperature extremes of different intensities and duration. In this study, an India ...

S. K. Dash; Ashu Mamgain

2011-09-01T23:59:59.000Z

439

Downscaling and Projection of Winter Extreme Daily Precipitation over North America  

Science Conference Proceedings (OSTI)

Large-scale atmospheric variables have been statistically downscaled to derive winter (December–March) maximum daily precipitation at stations over North America using the generalized extreme value distribution (GEV). Here, the leading principal ...

Jiafeng Wang; Xuebin Zhang

2008-03-01T23:59:59.000Z

440

A seasonal shift in the frequency of extreme hydrological events in southern New York State  

Science Conference Proceedings (OSTI)

The recent sequence of extreme hydrological events across the eastern US (e.g. Hurricane Irene in August 2011, Tropical Storm Lee in September 2011, Hurricane Sandy in October 2012) which led to unprecedented flooding including in various parts in ...

Adao H. Matonse; Allan Frei

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


441

Scaling of Precipitation Extremes over a Wide Range of Climates Simulated with an Idealized GCM  

E-Print Network (OSTI)

Extremes of precipitation are examined in a wide range of climates simulated with an idealized aquaplanet GCM. The high percentiles of daily precipitation increase as the climate warms. Their fractional rate of increase ...

O'Gorman, Paul Ambrose

442

Biases and Model Agreement in Projections of Climate Extremes over the Tropical Pacific  

Science Conference Proceedings (OSTI)

Using the Coupled Model Intercomparison Project phase 3 (CMIP3) general circulation models (GCMs), projections of a range of climate extremes are explored for the western Pacific. These projections include the 1-in-20-yr return levels and a ...

Sarah E. Perkins

2011-09-01T23:59:59.000Z

443

A Green Planet versus a Desert World: Estimating the Effect of Vegetation Extremes on the Atmosphere  

Science Conference Proceedings (OSTI)

The effect of vegetation extremes on the general circulation is estimated by two atmospheric GCM simulations using global desert and forest boundary conditions over land. The difference between the climates of a “green planet” and a “desert world”...

Klaus Fraedrich; Axel Kleidon; Frank Lunkeit

1999-10-01T23:59:59.000Z

444

A Better Way to ID Extreme Weather Events in Climate Models  

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

to do just that. "We're using state-of-the-art methods in data mining and high performance computing to locate and quantify extreme weather phenomena in the very large datasets...

445

Transport of Atmospheric Moisture during Three Extreme Rainfall Events over the Mackenzie River Basin  

Science Conference Proceedings (OSTI)

Lagrangian trajectories were computed for three extreme summer rainfall events (with rainfall exceeding 100 mm) over the southern Mackenzie River basin to test the hypothesis that the low-level moisture feeding these rainstorms can be traced back ...

Julian C. Brimelow; Gerhard W. Reuter

2005-08-01T23:59:59.000Z

446

Predicting Hurricane Landfall Precipitation: Optimistic and Pessimistic Views from the Symposium on Precipitation Extremes  

Science Conference Proceedings (OSTI)

The Symposium on Precipitation Extremes was one of two special symposia organized for the American Meteorological Society national meeting. This symposium was organized into sessions on winter precipitation, summer precipitation, and hurricane-...

Russell L. Elsberry

2002-09-01T23:59:59.000Z

447

Evaluation of the National Weather Service Extreme Cold Warning Experiment in North Dakota.  

Science Conference Proceedings (OSTI)

Dangerously cold weather threatens life and property. During periods of extreme cold due to wind chill, the National Weather Service (NWS) issues Wind Chill Warnings to prompt the public to take action to mitigate risks. Wind Chill Warnings are ...

Cindy H. Chiu; Sara J. Vagi; Amy F. Wolkin; John Paul Martin; Rebecca S. Noe

448

Extreme Chromatography: Faster, Hotter, SmallerChapter 9 Nano-liquid Chromatographic Separations  

Science Conference Proceedings (OSTI)

Extreme Chromatography: Faster, Hotter, Smaller Chapter 9 Nano-liquid Chromatographic Separations Methods and Analyses eChapters Methods - Analyses Books Downloadable pdf of Chapter 9 Nano-liquid Chromatographic Separ

449

Plenary lecture 7: fuzzy identification problem for the stationary discrete extremal fuzzy dynamic system  

Science Conference Proceedings (OSTI)

This work deals with the problem of the Stationary Discrete Extremal Fuzzy Dynamic System (SDEFDS) identification and briefly discusses the results developed by G. Sirbiladze. The fuzzy process with possibilistic uncertainty, the source of which is expert ...

Gia Sirbiladze

2009-06-01T23:59:59.000Z

450

Inference for Extremal Conditional Quantile Models, with an Application to Market and Birthweight Risks  

E-Print Network (OSTI)

Quantile regression is an increasingly important empirical tool in economics and other sciences for analyzing the impact of a set of regressors on the conditional distribution of an outcome. Extremal quantile regression, ...

Chernozhukov, Victor

2011-07-12T23:59:59.000Z

451

Recipes for Correcting the Impact of Effective Mesoscale Resolution on the Estimation of Extreme Winds  

Science Conference Proceedings (OSTI)

Extreme winds derived from simulations using mesoscale models are underestimated because of the effective spatial and temporal resolutions. This is reflected in the spectral domain as an energy deficit in the mesoscale range. The energy deficit ...

Xiaoli Guo Larsén; Søren Ott; Jake Badger; Andrea N. Hahmann; Jakob Mann

2012-03-01T23:59:59.000Z

452

Comparison of Monthly Temperature Extremes Simulated by CMIP3 and CMIP5 Models  

Science Conference Proceedings (OSTI)

The extreme monthly-mean temperatures simulated by 28 models in the fifth phase of the Coupled Model Intercomparison Project (CMIP5) are evaluated and compared with those from 24 models in the third phase of the Coupled Model Intercomparison ...

Yao Yao; Yong Luo; Jianbin Huang; Zongci Zhao

2013-10-01T23:59:59.000Z

453

Matter-Radiation Interactions in Extremes (MaRIE), Los Alamos...  

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

MaRIE: Matter-Radiation Interactions in Extremes Experimental Facility MaRIE Home MaRIE 1.0 Fission, Fusion materials Facility Accelerator Systems Making, Measuring and Modeling...

454

Spatial Predictions of Extreme Wind Speeds over Switzerland Using Generalized Additive Models  

Science Conference Proceedings (OSTI)

The purpose of this work is to present a methodology aimed at predicting extreme wind speeds over Switzerland. Generalized additive models are used to regionalize wind statistics for Swiss weather stations using a number of variables that ...

Christophe Etienne; Anthony Lehmann; Stéphane Goyette; Juan-Ignacio Lopez-Moreno; Martin Beniston

2010-09-01T23:59:59.000Z

455

Interannual Rainfall Extremes over Southwest Western Australia Linked to Indian Ocean Climate Variability  

Science Conference Proceedings (OSTI)

Interannual rainfall extremes over southwest Western Australia (SWWA) are examined using observations, reanalysis data, and a long-term natural integration of the global coupled climate system. The authors reveal a characteristic dipole pattern ...

Matthew H. England; Caroline C. Ummenhofer; Agus Santoso

2006-05-01T23:59:59.000Z

456

Precursor Circulation Features for Persistent Extreme Precipitation in Central-Eastern China  

Science Conference Proceedings (OSTI)

Using a composite analysis, the typical precursor circulation configuration from lower to upper troposphere responsible for persistent extreme precipitation events (PEPEs) of double blocking high type in Central-Eastern China is identified. The ...

Yang Chen; Panmao Zhai

457

Trends in Total Precipitation and Frequency of Daily Precipitation Extremes over China  

Science Conference Proceedings (OSTI)

Based on a newly developed daily precipitation dataset of 740 stations in China and more robust trend detection techniques, trends in annual and seasonal total precipitation and in extreme daily precipitation, defined as those larger than its ...

Panmao Zhai; Xuebin Zhang; Hui Wan; Xiaohua Pan

2005-04-01T23:59:59.000Z

458

Understanding Convective Extreme Precipitation Scaling Using Observations and an Entraining Plume Model  

Science Conference Proceedings (OSTI)

Previously observed twice Clausius-Clapeyron (2CC) scaling for extreme precipitation at hourly timescales has led to discussions about its origin. The robustness of this scaling is assessed by analyzing a sub-hourly dataset of 10-minute resolution ...

Jessica M. Loriaux; Geert Lenderink; Stephan R. De Roode; A. Pier Siebesma

459

An Analysis of the Potential for Extreme Temperature Change Based on Observations and Model Simulations  

Science Conference Proceedings (OSTI)

The study analyzes observational climate data for June–August 1977–2004 and simulations of current and future climate scenarios from a nested GCM/regional climate model system to assess the potential for extreme temperature change over the ...

Barry H. Lynn; Richard Healy; Leonard M. Druyan

2007-04-01T23:59:59.000Z

460

Effects of nutrient loading and extreme rainfall events on coastal tallgrass prairies: invasion intensity, vegetation  

E-Print Network (OSTI)

herbivory on the ability of Chinese tallow tree (Sapium sebiferum) to invade coastal prairie to determine of extreme rainfall events. Keywords: biological invasions, carbon, Chinese tallow tree, climate change

Siemann, Evan

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


461

Regional Climate Projections of Extreme Heat Events in Nine Pilot Canadian Communities for Public Health Planning  

Science Conference Proceedings (OSTI)

Public health planning needs the support of evidence-based information on current and future climate, that could be used by health professionals and decision-makers to better understand and respond to the health impacts of extreme heat. Climate ...

Barbara Casati; Abderrahmane Yagouti; Diane Chaumont

462

Durable silver mirror with ultra-violet thru far infra-red reflection  

DOE Patents (OSTI)

A durable highly reflective silver mirror characterized by high reflectance in a broad spectral range of about 300 nm in the UV to the far infrared (.about.10000 nm), as well as exceptional environmental durability. A high absorptivity metal underlayer is used which prevents the formation of a galvanic cell with a silver layer while increasing the reflectance of the silver layer. Environmentally durable overcoat layers are provided to enhance mechanical and chemical durability and protect the silver layer from corrosion and tarnishing, for use in a wide variety of surroundings or climates, including harsh or extreme environments.

Wolfe, Jesse D. (Discovery Bay, CA)

2010-11-23T23:59:59.000Z

463

Lack of uniform trends but increasing spatial variability in observed Indian rainfall extremes  

SciTech Connect

Recent studies disagree on how rainfall extremes over India have changed in space and time over the past half century, as well as on whether the changes observed are due to global warming or regional urbanization. Although a uniform and consistent decrease in moderate rainfall has been reported, a lack of agreement about trends in heavy rainfall may be due in part to differences in the characterization and spatial averaging of extremes. Here we use extreme value theory to examine trends in Indian rainfall over the past half century in the context of long-term, low-frequency variability.We show that when generalized extreme value theory is applied to annual maximum rainfall over India, no statistically significant spatially uniform trends are observed, in agreement with previous studies using different approaches. Furthermore, our space time regression analysis of the return levels points to increasing spatial variability of rainfall extremes over India. Our findings highlight the need for systematic examination of global versus regional drivers of trends in Indian rainfall extremes, and may help to inform flood hazard preparedness and water resource management in the region.

Ghosh, Subimal [ORNL; Das, Debasish [ORNL; Kao, Shih-Chieh [ORNL; Ganguly, Auroop R [ORNL

2012-01-01T23:59:59.000Z

464

Incident Investigation and Reporting  

Science Conference Proceedings (OSTI)

This report presents a model procedure for incident investigations based on an examination of programs at fourteen utilities believed to have good and effective procedures. The model was compiled by an expert who also drew on materials from other industries. An outline presents the basic procedure while the main text discusses in more detail alternate methods that may be preferable for a specific utility.

2003-05-19T23:59:59.000Z

465

Incipient and Progressive Damage in Polyethylene Under Extreme Tensile Conditions  

Science Conference Proceedings (OSTI)

The Dynamic-Tensile-Extrusion (Dyn-Ten-Ext) test was developed at LANL by Gray and coworkers to probe the tensile response of materials at large strains (>1) and high strain-rates (>1000/s) by firing projectiles through a conical die at 300-700 m/s. This technique has recently been applied to various polymers, such as the fluoropolymers PTFE (Teflon) and the chemically similar PCTFE, which respectively exhibited catastrophic fragmentation and distributed dynamic necking. This work details investigations of the Dyn-Ten-Ext response of high density polyethylene, both to failure and sub-critical conditions. At large extrusion ratios ({approx}7.4) and high velocities, such as those previously employed, HDPE catastrophically fragmented in a craze-like manner in the extruded jet. At more modest extrusion ratios and high velocities the specimen extruded a stable jet that ruptured cleanly, and at lower velocities was recovered intact after sustaining substantial internal damage. Thermomechanical finite element simulations showed that the damage corresponded to a locus of shear stress in the presence of hydrostatic tension. X-ray computed tomography corroborated the prediction of a shear damage mechanism by finding the region of partially damaged material to consist of macroscopic shear-mode cracks nearly aligned with the extrusion axis, originating from the location of damage inception.

Furmanski, Jevan [Los Alamos National Laboratory; Brown, Eric [Los Alamos National Laboratory; Trujillo, Carl P. [Los Alamos National Laboratory; Martinez, Daniel Tito [Los Alamos National Laboratory; Gray, George T. III [Los Alamos National Laboratory

2012-06-07T23:59:59.000Z

466

Extremal entanglement and mixedness in continuous variable systems  

E-Print Network (OSTI)

We investigate the relationship between mixedness and entanglement for Gaussian states of continuous variable systems. We introduce generalized entropies based on Schatten $p$-norms to quantify the mixedness of a state, and derive their explicit expressions in terms of symplectic spectra. We compare the hierarchies of mixedness provided by such measures with the one provided by the purity (defined as ${\\rm tr} \\varrho^2$ for the state $\\varrho$) for generic $n$-mode states. We then review the analysis proving the existence of both maximally and minimally entangled states at given global and marginal purities, with the entanglement quantified by the logarithmic negativity. Based on these results, we extend such an analysis to generalized entropies, introducing and fully characterizing maximally and minimally entangled states for given global and local generalized entropies. We compare the different roles played by the purity and by the generalized $p$-entropies in quantifying the entanglement and the mixedness of continuous variable systems. We introduce the concept of average logarithmic negativity, showing that it allows a reliable quantitative estimate of continuous variable entanglement by direct measurements of global and marginal generalized $p$-entropies.

Gerardo Adesso; Alessio Serafini; Fabrizio Illuminati

2004-02-18T23:59:59.000Z

467

Extremal entanglement and mixedness in continuous variable systems  

Science Conference Proceedings (OSTI)

We investigate the relationship between mixedness and entanglement for Gaussian states of continuous variable systems. We introduce generalized entropies based on Schatten p norms to quantify the mixedness of a state and derive their explicit expressions in terms of symplectic spectra. We compare the hierarchies of mixedness provided by such measures with the one provided by the purity (defined as tr {rho}{sup 2} for the state {rho}) for generic n-mode states. We then review the analysis proving the existence of both maximally and minimally entangled states at given global and marginal purities, with the entanglement quantified by the logarithmic negativity. Based on these results, we extend such an analysis to generalized entropies, introducing and fully characterizing maximally and minimally entangled states for given global and local generalized entropies. We compare the different roles played by the purity and by the generalized p entropies in quantifying the entanglement and the mixedness of continuous variable systems. We introduce the concept of average logarithmic negativity, showing that it allows a reliable quantitative estimate of continuous variable entanglement by direct measurements of global and marginal generalized p entropies.

Adesso, Gerardo; Serafini, Alessio; Illuminati, Fabrizio [Dipartimento di Fisica 'E. R. Caianiello', Universita di Salerno, INFM UdR di Salerno, INFN Sezione di Napoli, Gruppo Collegato di Salerno, Via S. Allende, 84081 Baronissi, SA (Italy)

2004-08-01T23:59:59.000Z

468

HST/WFPC2 Morphologies of K-selected Extremely Red Galaxies  

E-Print Network (OSTI)

We selected 115 extremely red objects (EROs) from deep HST WFPC2 archive data combined with ground-based K-band images, with (F814W - Ks) >= 4mag, K-band SNR >= 5, and a median limiting Ks magnitude of 18.7mag, over a corresponding area of 228 sq. arcminutes, for a morphological study of the ERO galaxy population. The survey covered a total of 409 sq. arcminutes over 77 separate WFPC2 fields. This is the first complete sample of bright EROs with high resolution HST morphologies. From a visual morphological classification, we find that 30+/-5% of our EROs have morphologies consistent with a pure bulge or bulge-dominated galaxy (equivalent to E/S0), while disks comprise 64+/-$7% of the sample. Only 6% of the EROs remained unclassifiable. Mergers or strongly interacting systems, which includes sources from both classes, make up 17+/-4% of the full sample. The quantitative MDS profile fitting is consistent with these results. These results highlight the complex nature of optical/near-IR color selected EROs. The dominant component of our sample is comprised of disks, not spheroids or strongly interacting systems like HR10. Using Bruzual & Charlot SED models, we investigated population differences in EROs selected by their (I-K) vs. (R-K) colors and found that I-band based surveys preferentially select systems with prolonged star formation. Real differences in the surface densities of EROs in R-band and I-band based surveys may reflect this color selection effect, complicating the comparisons between and interpretations on the nature of the ERO population.

L. Yan; D. Thompson

2002-12-06T23:59:59.000Z

469

ACTUAL-WASTE TESTING OF ULTRAVIOLET LIGHT TO AUGMENT THE ENHANCED CHEMICAL CLEANING OF SRS SLUDGE  

SciTech Connect

In support of Savannah River Site (SRS) tank closure efforts, the Savannah River National Laboratory (SRNL) conducted Real Waste Testing (RWT) to evaluate Enhanced Chemical Cleaning (ECC), an alternative to the baseline 8 wt% oxalic acid (OA) chemical cleaning technology for tank sludge heel removal. ECC utilizes a more dilute OA solution (2 wt%) and an oxalate destruction technology using ozonolysis with or without the application of ultraviolet (UV) light. SRNL conducted tests of the ECC process using actual SRS waste material from Tanks 5F and 12H. The previous phase of testing involved testing of all phases of the ECC process (sludge dissolution, OA decomposition, product evaporation, and deposition tank storage) but did not involve the use of UV light in OA decomposition. The new phase of testing documented in this report focused on the use of UV light to assist OA decomposition, but involved only the OA decomposition and deposition tank portions of the process. Compared with the previous testing at analogous conditions without UV light, OA decomposition with the use of UV light generally reduced time required to reach the target of <100 mg/L oxalate. This effect was the most pronounced during the initial part of the decomposition batches, when pH was <4. For the later stages of each OA decomposition batch, the increase in OA decomposition rate with use of the UV light appeared to be minimal. Testing of the deposition tank storage of the ECC product resulted in analogous soluble concentrations regardless of the use or non-use of UV light in the ECC reactor.

Martino, C.; King, W.; Ketusky, E.

2012-07-10T23:59:59.000Z

470

Verifying the Cosmological Utility of Type Ia Supernovae: Implications of a Dispersion in the Ultraviolet Spectra  

SciTech Connect

We analyze the mean rest-frame ultraviolet (UV) spectrum of Type Ia Supernovae (SNe) and its dispersion using high signal-to-noise ratio Keck-I/LRIS-B spectroscopy for a sample of 36 events at intermediate redshift (z=0.5) discovered by the Canada-France-Hawaii Telescope Supernova Legacy Survey (SNLS). We introduce a new method for removing host galaxy contamination in our spectra, exploiting the comprehensive photometric coverage of the SNLS SNe and their host galaxies, thereby providing the first quantitative view of the UV spectral properties of a large sample of distant SNe Ia. Although the mean SN Ia spectrum has not evolved significantly over the past 40percent of cosmic history, precise evolutionary constraints are limited by the absence of a comparable sample of high-quality local spectra. The mean UV spectrum of our z~;;=0.5 SNe Ia and its dispersion is tabulated for use in future applications. Within the high-redshift sample, we discover significant UV spectral variations and exclude dust extinction as the primary cause by examining trends with the optical SN color. Although progenitor metallicity may drive some of these trends, the variations we see are much larger than predicted in recent models and do not follow expected patterns. An interesting new result is a variation seen in the wavelength of selected UV features with phase. We also demonstrate systematic differences in the SN Ia spectral features with SN light curve width in both the UV and the optical. We show that these intrinsic variations could represent a statistical limitation in the future use of high-redshift SNe Ia for precision cosmology. We conclude that further detailed studies are needed, both locally and at moderate redshift where the rest-frame UV can be studied precisely, in order that future missions can confidently be planned to fully exploit SNe Ia as cosmological probes.

Nugent, Peter E; Ellis, R.S.; Sullivan, M.; Nugent, P.E.; Howell, D.A.; Gal-Yam, A.; Astier, P.; Balam, D.; Balland, C.; Basa, S.; Carlberg, R.; Conley, A.; Fouchez, D.; Guy, J.; Hardin, D.; Hook, I.; Pain, R.; Perrett, K.; Pritchet, C.J.; Regnault, N.

2008-02-28T23:59:59.000Z

471

Accident Investigation Handbook  

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

SENSI NOT MEAS UREMENT TIVE D DOE-HDBK-1 1208-2012 July 2012 DOE E HA ANDBOOK K Ac ccide ent and d Op pera ational Sa afety y An naly ysis Volume e I: Ac ccide ent A Analy ysis Tec chniq ques U.S. Depar rtmen nt of En nergy Was shingto on, D.C C. 205 85 DOE-HDBK-1208-2012 INTRODUCTION - HANDBOOK APPLICATION AND SCOPE Accident Investigations (AI) and Operational Safety Reviews (OSR) are valuable for evaluating technical issues, safety management systems and human performance and environmental conditions to prevent accidents, through a process of continuous organizational learning. This Handbook brings together the strengths of the experiences gained in conducting Department of Energy (DOE) accident investigations over the past many years. That experience encourages us

472

Hurricane Season May Be "Extremely Active" http://news.nationalgeographic.com/news/hurricane-season-extremely-active-forecast-atlantic-nation/[5/28/2010 11:51:08 AM  

E-Print Network (OSTI)

.com/news/hurricane-season-extremely-active-forecast-atlantic-nation/[5/28/2010 11:51:08 AM] Gulf Oil Spill News and Pictures Gulf Oil Spill Worst in U.S. History Amid Reptile Found Rare Photos: Gulf Oil Rig Sinks Gulf Oil Spill Worst in U.S. History Hurricane Season Active" Atlantic-born hurricanes would have unknown consequences for Gulf oil spill. Inspiring people

Rock, Chris

473

Response of snow-dependent hydrologic extremes to continued global warming  

SciTech Connect

Snow accumulation is critical for water availability in the Northern Hemisphere1,2, raising concern that global warming could have important impacts on natural and human systems in snow-dependent regions1,3. Although regional hydrologic changes have been observed (for example, refs 1,3 5), the time of emergence of extreme changes in snow accumulation and melt remains a key unknown for assessing climate- change impacts3,6,7. We find that the CMIP5 global climate model ensemble exhibits an imminent shift towards low snow years in the Northern Hemisphere, with areas of western North America, northeastern Europe and the Greater Himalaya showing the strongest emergence during the near- termdecadesandat2 Cglobalwarming.Theoccurrenceof extremely low snow years becomes widespread by the late twenty-first century, as do the occurrences of extremely high early-season snowmelt and runoff (implying increasing flood risk), and extremely low late-season snowmelt and runoff (implying increasing water stress). Our results suggest that many snow-dependent regions of the Northern Hemisphere are likely to experience increasing stress from low snow years within the next three decades, and from extreme changes in snow-dominated water resources if global warming exceeds 2 C above the pre-industrial baseline.

Diffenbaugh, Noah [Stanford University; Scherer, Martin [Stanford University; Ashfaq, Moetasim [ORNL

2012-01-01T23:59:59.000Z

474

IAEA Coordinated Research Programme on Investigation of ...  

Science Conference Proceedings (OSTI)

IAEA's actions are focused on key nuclear techniques which are extremely valuable in material science, characterisation and performance testing of functional ...

475

Finite element simulation for ultraviolet excimer laser processing of patterned Si/SiGe/Si(100) heterostructures  

SciTech Connect

Ultraviolet (UV) Excimer laser assisted processing is an alternative strategy for producing patterned silicon germanium heterostructures. We numerically analyzed the effects caused by pulsed 193 Excimer laser radiation impinging on patterned amorphous hydrogenated silicon (a-Si:H) and germanium (a-Ge:H) bilayers deposited on a crystalline silicon substrate [Si(100)]. The proposed two dimensional axisymmetric numerical model allowed us to estimate the temperature and concentration gradients caused by the laser induced rapid melting and solidification processes. Energy density dependence of maximum melting depth and melting time evolution as well as three dimensional temperature and element distribution have been simulated and compared with experimentally obtained results.

Conde, J. C.; Chiussi, S.; Gontad, F.; Gonzalez, P. [Dpto. Fisica Aplicada, University of Vigo, E-36310 Vigo (Spain); Martin, E. [Dpto. Mecanica, Maquinas, Motores Termicos y Fluidos, University of Vigo, E-36310 Vigo (Spain); Serra, C. [CACTI, University of Vigo, E-36310 Vigo (Spain)

2010-07-05T23:59:59.000Z

476

Ultraviolet Spectroscopy of Comet 9P/Tempel 1 with Alice/Rosetta during the Deep Impact Encounter  

E-Print Network (OSTI)

We report on spectroscopic observations of periodic comet 9P/Tempel 1 by the Alice ultraviolet spectrograph on the Rosetta spacecraft in conjunction with NASA's Deep Impact mission. Our objectives were to measure an increase in atomic and molecular emissions produced by the excavation of volatile sub-surface material. We unambiguously detected atomic oxygen emission from the quiescent coma but no enhancement at the 10% (1-sigma) level following the impact. We derive a quiescent water production rate of 9 x 10^27 molecules per second with an estimated uncertainty of 30%. Our upper limits to the volatiles produced by the impact are consistent with other estimates.

Paul D. Feldman; S. Alan Stern; Andrew J. Steffl; Joel Wm. Parker; David C. Slater; Michael F. A'Hearn; Jean-Loup Bertaux; Michel C. Festou

2006-08-31T23:59:59.000Z

477

Co-Investigators:  

E-Print Network (OSTI)

Our Interdisciplinary Science investigation addresses the primary biogeochemical cycles of planet Earth and considers, in particular, how they are being changed by humans. The efforts focus on the cycles of water, carbon, nitrogen, and selected trace gases. Process-based models are developed as modules, in concert with database management techniques which synthesize the in-situ and remote sensing data needed to characterize regional and global scales. Models of the Earth's biogeochemical cycles are a central theme. They provide a rigorous means for developing quantitative projections of the interactions of atmospheric composition, climate, terrestrial and aquatic ecosystems, ocean circulation and sea level, and the effects of human activities. The family of models being developed in this investigation provide the predictive link between the physical and biological Earth system and the human dimensions of global change. The long-term goal of our IDS research is to understand the primary biogeochemical cycles of the planet, the nature of the coupling between the Biogeochemical Subsystem and the Physical-Climate Subsystem, and the characteristics of the human forcing of the Biogeochemical Subsystem and hydrological cycle. Our strategy is to study how element cycles function in natural systems where perturbations in biogeochemical states are driven primarily by climate variability

John D. Aber; William R. Emanuel; Leonard A. Fisk; Barrett N. Rock; David L. Skole

1998-01-01T23:59:59.000Z

478

The Efficacy of Ultraviolet Radiation for Sterilizing Tools Used for Surgically Implanting Transmitters into Fish  

SciTech Connect

Telemetry is frequently used to examine the behavior of fish, and the transmitters used are normally surgically implanted into the coelom of fish. Implantation requires the use of surgical tools such as scalpels, forceps, needle holders, and sutures. When several fish are implanted consecutively for large telemetry studies, it is common for surgical tools to be sterilized or, at minimum, disinfected between each use so that pathogens that may be present are not spread among fish. However, autoclaving tools can take a long period of time, and chemical sterilants or disinfectants can be harmful to both humans and fish and have varied effectiveness. Ultraviolet (UV) radiation is commonly used to disinfect water in aquaculture facilities. However, this technology has not been widely used to sterilize tools for surgical implantation of transmitters in fish. To determine its efficacy for this application, Pacific Northwest National Laboratory researchers used UV radiation to disinfect surgical tools (i.e., forceps, needle holder, stab scalpel, and suture) that were exposed to one of four aquatic organisms that typically lead to negative health issues for salmonids. These organisms included Aeromonas salmonicida, Flavobacterium psychrophilum, Renibacterium salmoninarum, and Saprolegnia parasitica. Surgical tools were exposed to the bacteria by dipping them into a confluent suspension of three varying concentrations (i.e., low, medium, high). After exposure to the bacterial culture, tools were placed into a mobile Millipore UV sterilization apparatus. The tools were then exposed for three different time periods—2, 5, or 15 min. S. parasitica, a water mold, was tested using an agar plate method and forceps-pinch method. UV light exposures of 5 and 15 min were effective at killing all four organisms. UV light was also effective at killing Geobacillus stearothermophilus, the organism used as a biological indicator to verify effectiveness of steam sterilizers. These techniques appear to provide a quick alternative disinfection technique for some surgical tools that is less harmful to both humans and fish while not producing chemical waste. However, we do not recommend using these methods with tools that have overlapping parts or other structures that cannot be directly exposed to UV light such as needle holders.

Walker, Ricardo W.; Markillie, Lye Meng; Colotelo, Alison HA; Gay, Marybeth E.; Woodley, Christa M.; Brown, Richard S.

2013-02-28T23:59:59.000Z

479

U.S. Energy Sector Vulnerabilities to Climate Change and Extreme Weather |  

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

U.S. Energy Sector Vulnerabilities to Climate Change and Extreme U.S. Energy Sector Vulnerabilities to Climate Change and Extreme Weather U.S. Energy Sector Vulnerabilities to Climate Change and Extreme Weather This report-part of the Administration's efforts to support national climate change adaptation planning through the Interagency Climate Change Adaptation Task Force and Strategic Sustainability Planning process established under Executive Order 13514 and to advance the U.S. Department of Energy's goal of promoting energy security-examines current and potential future impacts of these climate trends on the U.S. energy sector. Report updated July 16, 2013. Explore an interactive map that shows where climate change has already impacted the energy sector. US Energy Sector Vulnerabilities to Climate Change More Documents & Publications

480

Preservation of an extreme transient geotherm in the Raft River detachment  

Open Energy Info (EERE)

Preservation of an extreme transient geotherm in the Raft River detachment Preservation of an extreme transient geotherm in the Raft River detachment shear zone Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Preservation of an extreme transient geotherm in the Raft River detachment shear zone Details Activities (1) Areas (1) Regions (0) Abstract: Extensional detachment systems separate hot footwalls from cool hanging walls, but the degree to which this thermal gradient is the product of ductile or brittle deformation or a preserved original transient geotherm is unclear. Oxygen isotope thermometry using recrystallized quartz-muscovite pairs indicates a smooth thermal gradient (140 °C/100 m) across the gently dipping, quartzite-dominated detachment zone that bounds the Raft River core complex in northwest Utah (United States). Hydrogen

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


481

Materials Science in Radiation and Dynamics Extremes:MST-8:LANL:Los Alamos  

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

in Radiation and Dynamics Extremes (MST-8) in Radiation and Dynamics Extremes (MST-8) Home About Us MST Related Links Research Highlights Focus on Facilities MST e-News Experimental Physical Sciences Vistas MaRIE: Matter-Radiation Interactions in Extremes MST Division Home CONTACTS Group Leader, Anna Zurek Deputy Group Leader Ellen Cerreta Point of Contact Group Office 505-665-4735 He bubbles foming at a Cu twist grain boundary He bubbles forming at a Cu twist grain boundary Evaluating and predicting structure/property relationships Predict structure/property relationships of structural (metals, alloys, actinides, binders, energetic, and specialty) materials from atomistic to continuum length scales; Use computational materials modeling to inform and complement the measurements listed above;

482

#LabChat: Extreme Circumstances, Unique Solutions, June 28 at 1pm EDT |  

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

Extreme Circumstances, Unique Solutions, June 28 at 1pm Extreme Circumstances, Unique Solutions, June 28 at 1pm EDT #LabChat: Extreme Circumstances, Unique Solutions, June 28 at 1pm EDT June 27, 2012 - 2:31pm Addthis The simple, portable device identifies materials through their characteristic energy signals as unique as fingerprints. The three detectors are housed in a thermos-sized container that is connected to a laptop computer. The device issues a signal turning the laptop display bright red when nuclear material of interest is identified. | Photo courtesy of Princeton University The simple, portable device identifies materials through their characteristic energy signals as unique as fingerprints. The three detectors are housed in a thermos-sized container that is connected to a laptop computer. The device issues a signal turning the laptop display

483

Tracing the behavior of parallel applications on extreme-scale systems |  

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

Tracing the behavior of parallel applications on extreme-scale systems Tracing the behavior of parallel applications on extreme-scale systems January 3, 2014 Tweet EmailPrint Event-tracing tools have proved vital for understanding how parallel applications behave. But new challenges make the use of event tracing on extreme-scale machines problematic. Tracing tools generate large amounts of data, which can overload the parallel file system and skew the application being studied. To remedy this problem, researchers from Argonne National Laboratory, the Technische Universität Dresden in Germany, and Oak Ridge National Laboratory have