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1

Investigating Extreme Ultraviolet Lithography Mask Defects  

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

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2

Investigating Extreme Ultraviolet Lithography Mask Defects  

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

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3

Investigating Extreme Ultraviolet Lithography Mask Defects  

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

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4

Investigating Extreme Ultraviolet Lithography Mask Defects  

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

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5

Investigating Extreme Ultraviolet Lithography Mask Defects  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsruc DocumentationP-SeriesFlickrinformation for and ApplicationNuclearLeao BrunoInvestigating Extreme

6

Investigating Extreme Ultraviolet Lithography Mask Defects  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsruc DocumentationP-SeriesFlickrinformation for and ApplicationNuclearLeao BrunoInvestigating

7

Extreme Ultraviolet Light Chris Cosio  

E-Print Network [OSTI]

Prospectus Extreme Ultraviolet Light Chris Cosio #12;The field of extreme ultraviolet light (XUV to the way XUV interacts with object, XUV properties are difficult to observe. Extreme ultraviolet light is absorbed by all objects it comes in contact with. Furthermore, extreme ultraviolet light also has low

Hart, Gus

8

Extreme ultraviolet lithography machine  

DOE Patents [OSTI]

An extreme ultraviolet lithography (EUVL) machine or system for producing integrated circuit (IC) components, such as transistors, formed on a substrate. The EUVL machine utilizes a laser plasma point source directed via an optical arrangement onto a mask or reticle which is reflected by a multiple mirror system onto the substrate or target. The EUVL machine operates in the 10-14 nm wavelength soft x-ray photon. Basically the EUV machine includes an evacuated source chamber, an evacuated main or project chamber interconnected by a transport tube arrangement, wherein a laser beam is directed into a plasma generator which produces an illumination beam which is directed by optics from the source chamber through the connecting tube, into the projection chamber, and onto the reticle or mask, from which a patterned beam is reflected by optics in a projection optics (PO) box mounted in the main or projection chamber onto the substrate. In one embodiment of a EUVL machine, nine optical components are utilized, with four of the optical components located in the PO box. The main or projection chamber includes vibration isolators for the PO box and a vibration isolator mounting for the substrate, with the main or projection chamber being mounted on a support structure and being isolated.

Tichenor, Daniel A. (Castro Valley, CA); Kubiak, Glenn D. (Livermore, CA); Haney, Steven J. (Tracy, CA); Sweeney, Donald W. (San Ramon, CA)

2000-01-01T23:59:59.000Z

9

Systematic investigation of self-absorption and conversion efficiency of 6.7 nm extreme ultraviolet sources  

SciTech Connect (OSTI)

We have investigated the dependence of the spectral behavior and conversion efficiencies of rare-earth plasma extreme ultraviolet sources with peak emission at 6.7 nm on laser wavelength and the initial target density. The maximum conversion efficiency was 1.3% at a laser intensity of 1.6x10{sup 12} W/cm{sup 2} at an operating wavelength of 1064 nm, when self-absorption was reduced by use of a low initial density target. Moreover, the lower-density results in a narrower spectrum and therefore improved spectral purity. It is shown to be important to use a low initial density target and/or to produce low electron density plasmas for efficient extreme ultraviolet sources when using high-Z targets.

Otsuka, Takamitsu; Higashiguchi, Takeshi; Yugami, Noboru; Yatagai, Toyohiko [Department of Advanced Interdisciplinary Sciences and Center for Optical Research and Education (CORE), Utsunomiya University, Yoto 7-1-2, Utsunomiya, Tochigi 321-8585 (Japan); Kilbane, Deirdre; Dunne, Padraig; O'Sullivan, Gerry [School of Physics, University College Dublin, Belfield, Dublin 4 (Ireland); Jiang, Weihua [Department of Electrical Engineering, Nagaoka University of Technology, Kami-tomiokamachi 1603-1, Nagaoka, Niigata 940-2188 Japan (Japan); Endo, Akira [Forschungszentrum Dresden, Bautzner Landstrs. 400, Dresden D-01328 (Germany)

2010-12-06T23:59:59.000Z

10

Extreme ultraviolet lithography: A few more pieces of the puzzle  

E-Print Network [OSTI]

to the performance of extreme ultraviolet micro?eld expo-calibration of extreme ultraviolet photoresists,” Opticsthree essential components of extreme ultraviolet (EUV)

Anderson, Christopher N.

2009-01-01T23:59:59.000Z

11

Method for extreme ultraviolet lithography  

DOE Patents [OSTI]

A method of producing a patterned array of features, in particular, gate apertures, in the size range 0.4-0.05 .mu.m using projection lithography and extreme ultraviolet (EUV) radiation. A high energy laser beam is used to vaporize a target material in order to produce a plasma which in turn, produces extreme ultraviolet radiation of a characteristic wavelength of about 13 nm for lithographic applications. The radiation is transmitted by a series of reflective mirrors to a mask which bears the pattern to be printed. The demagnified focused mask pattern is, in turn, transmitted by means of appropriate optics and in a single exposure, to a substrate coated with photoresists designed to be transparent to EUV radiation and also satisfy conventional processing methods.

Felter, T. E. (Livermore, CA); Kubiak, Glenn D. (Livermore, CA)

1999-01-01T23:59:59.000Z

12

Method for extreme ultraviolet lithography  

DOE Patents [OSTI]

A method of producing a patterned array of features, in particular, gate apertures, in the size range 0.4-0.05 .mu.m using projection lithography and extreme ultraviolet (EUV) radiation. A high energy laser beam is used to vaporize a target material in order to produce a plasma which in turn, produces extreme ultraviolet radiation of a characteristic wavelength of about 13 nm for lithographic applications. The radiation is transmitted by a series of reflective mirrors to a mask which bears the pattern to be printed. The demagnified focused mask pattern is, in turn, transmitted by means of appropriate optics and in a single exposure, to a substrate coated with photoresists designed to be transparent to EUV radiation and also satisfy conventional processing methods.

Felter, T. E. (727 Clara St., Livermore, Alameda County, CA 94550); Kubiak, G. D. (475 Maple St., Livermore, Alameda County, CA 94550)

2000-01-01T23:59:59.000Z

13

Extreme ultraviolet interferometry  

SciTech Connect (OSTI)

EUV lithography is a promising and viable candidate for circuit fabrication with 0.1-micron critical dimension and smaller. In order to achieve diffraction-limited performance, all-reflective multilayer-coated lithographic imaging systems operating near 13-nm wavelength and 0.1 NA have system wavefront tolerances of 0.27 nm, or 0.02 waves RMS. Owing to the highly-sensitive resonant reflective properties of multilayer mirrors and extraordinarily tight tolerances set forth for their fabrication, EUV optical systems require at-wavelength EUV interferometry for final alignment and qualification. This dissertation discusses the development and successful implementation of high-accuracy EUV interferometric techniques. Proof-of-principle experiments with a prototype EUV point-diffraction interferometer for the measurement of Fresnel zoneplate lenses first demonstrated sub-wavelength EUV interferometric capability. These experiments spurred the development of the superior phase-shifting point-diffraction interferometer (PS/PDI), which has been implemented for the testing of an all-reflective lithographic-quality EUV optical system. Both systems rely on pinhole diffraction to produce spherical reference wavefronts in a common-path geometry. Extensive experiments demonstrate EUV wavefront-measuring precision beyond 0.02 waves RMS. EUV imaging experiments provide verification of the high-accuracy of the point-diffraction principle, and demonstrate the utility of the measurements in successfully predicting imaging performance. Complementary to the experimental research, several areas of theoretical investigation related to the novel PS/PDI system are presented. First-principles electromagnetic field simulations of pinhole diffraction are conducted to ascertain the upper limits of measurement accuracy and to guide selection of the pinhole diameter. Investigations of the relative merits of different PS/PDI configurations accompany a general study of the most significant sources of systematic measurement errors. To overcome a variety of experimental difficulties, several new methods in interferogram analysis and phase-retrieval were developed: the Fourier-Transform Method of Phase-Shift Determination, which uses Fourier-domain analysis to improve the accuracy of phase-shifting interferometry; the Fourier-Transform Guided Unwrap Method, which was developed to overcome difficulties associated with a high density of mid-spatial-frequency blemishes and which uses a low-spatial-frequency approximation to the measured wavefront to guide the phase unwrapping in the presence of noise; and, finally, an expedient method of Gram-Schmidt orthogonalization which facilitates polynomial basis transformations in wave-front surface fitting procedures.

Goldberg, K.A. [Univ. of California, Berkeley, CA (United States). Dept. of Physics; [Lawrence Berkeley National Lab., CA (United States). Materials Sciences Div.

1997-12-01T23:59:59.000Z

14

Solar Dynamics Observatory/ Extreme Ultraviolet Variability Experiment  

E-Print Network [OSTI]

Solar Dynamics Observatory/ EVE Extreme Ultraviolet Variability Experiment Frequently Asked and model solar extreme ultraviolet irradiance variations due to solar flares, solar rotation, and solar and structure of the Sun. What is solar variability? Solar radiation varies on all time scales ranging from

Mojzsis, Stephen J.

15

Photoresist composition for extreme ultraviolet lithography  

DOE Patents [OSTI]

A method of producing a patterned array of features, in particular, gate apertures, in the size range 0.4-0.05 .mu.m using projection lithography and extreme ultraviolet (EUV) radiation. A high energy laser beam is used to vaporize a target material in order to produce a plasma which in turn, produces extreme ultraviolet radiation of a characteristic wavelength of about 13 nm for lithographic applications. The radiation is transmitted by a series of reflective mirrors to a mask which bears the pattern to be printed. The demagnified focused mask pattern is, in turn, transmitted by means of appropriate optics and in a single exposure, to a substrate coated with photoresists designed to be transparent to EUV radiation and also satisfy conventional processing methods. A photoresist composition for extreme ultraviolet radiation of boron carbide polymers, hydrochlorocarbons and mixtures thereof.

Felter, T. E. (Alameda County, CA); Kubiak, G. D. (Alameda County, CA)

1999-01-01T23:59:59.000Z

16

THORIUM-BASED MIRRORS IN THE EXTREME ULTRAVIOLET Nicole Farnsworth  

E-Print Network [OSTI]

THORIUM-BASED MIRRORS IN THE EXTREME ULTRAVIOLET by Nicole Farnsworth Submitted to Brigham Young Ultraviolet and Thorium-based Mirrors . . . 1 1.2 Project Background the Optical Constants of Thorium Oxide 34 3.1 Reflectance and Transmittance Measurements

Hart, Gus

17

620 OPTICS LETTERS / Vol. 29, No. 6 / March 15, 2004 Damage to extreme-ultraviolet Sc Si multilayer mirrors  

E-Print Network [OSTI]

620 OPTICS LETTERS / Vol. 29, No. 6 / March 15, 2004 Damage to extreme-ultraviolet Sc Si multilayer, Russia Received August 21, 2003 The damage threshold and damage mechanism of extreme-ultraviolet Sc Si multilayer mirror coatings are investigated with focused nanosecond pulses at 46.9-nm radiation from

Rocca, Jorge J.

18

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

19

Efficient 13.5 nm extreme ultraviolet emission from Sn plasma irradiated by a long CO2 laser pulse  

E-Print Network [OSTI]

Efficient 13.5 nm extreme ultraviolet emission from Sn plasma irradiated by a long CO2 laser pulse-band 2% bandwidth conversion efficiency CE from a CO2 laser to 13.5 nm extreme ultraviolet EUV light was investigated for Sn plasma. It was found that high in-band CE, 2.6%, is consistently obtained using a CO2 laser

Najmabadi, Farrokh

20

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

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

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

22

Extreme Ultra-Violet Spectroscopy of the Flaring Solar Chromosphere  

E-Print Network [OSTI]

The extreme ultraviolet portion of the solar spectrum contains a wealth of diagnostic tools for probing the lower solar atmosphere in response to an injection of energy, particularly during the impulsive phase of solar flares. These include temperature and density sensitive line ratios, Doppler shifted emission lines and nonthermal broadening, abundance measurements, differential emission measure profiles, and continuum temperatures and energetics, among others. In this paper I shall review some of the advances made in recent years using these techniques, focusing primarily on studies that have utilized data from Hinode/EIS and SDO/EVE, while also providing some historical background and a summary of future spectroscopic instrumentation.

Milligan, Ryan O

2015-01-01T23:59:59.000Z

23

Self-cleaning optic for extreme ultraviolet lithography  

DOE Patents [OSTI]

A multilayer reflective optic or mirror for lithographic applications, and particularly extreme ultraviolet (EUV) lithography, having a surface or "capping" layer which in combination with incident radiation and gaseous molecular species such as O.sub.2, H.sub.2, H.sub.2 O provides for continuous cleaning of carbon deposits from the optic surface. The metal capping layer is required to be oxidation resistant and capable of transmitting at least 90% of incident EUV radiation. Materials for the capping layer include Ru, Rh, Pd, Ir, Pt and Au and combinations thereof.

Klebanoff, Leonard E.; Stulen, Richard H.

2003-12-16T23:59:59.000Z

24

MoRu/Be multilayers for extreme ultraviolet applications  

DOE Patents [OSTI]

High reflectance, low intrinsic roughness and low stress multilayer systems for extreme ultraviolet (EUV) lithography comprise amorphous layers MoRu and crystalline Be layers. Reflectance greater than 70% has been demonstrated for MoRu/Be multilayers with 50 bilayer pairs. Optical throughput of MoRu/Be multilayers can be 30-40% higher than that of Mo/Be multilayer coatings. The throughput can be improved using a diffusion barrier to make sharper interfaces. A capping layer on the top surface of the multilayer improves the long-term reflectance and EUV radiation stability of the multilayer by forming a very thin native oxide that is water resistant.

Bajt, Sasa C. (Livermore, CA); Wall, Mark A. (Stockton, CA)

2001-01-01T23:59:59.000Z

25

Spectral Control of Emission from Tin Doped Targets for Extreme Ultraviolet Lithography  

E-Print Network [OSTI]

control of emissions from tin doped targets for extremearray (UTA) emission around 13.5 nm from solid density tinand tin doped foam targets. Extreme ultraviolet (EUV)

2006-01-01T23:59:59.000Z

26

alpha-class extreme ultraviolet: Topics by E-print Network  

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

Vacuum Society. S0734-211X 00 02506-3 I. INTRODUCTION EUV lithography optics require 5 Solar Dynamics Observatory Extreme Ultraviolet Variability Experiment Geosciences Websites...

27

Investigating Extreme Ultraviolet Lithography Mask Defects  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: Vegetation ProposedUsingFunInfrared LandResponses to

28

Ultrafast Extreme Ultraviolet Induced Isomerization of Acetylene Cations  

SciTech Connect (OSTI)

Ultrafast isomerization of acetylene cations ([HC = CH]{sup +}) in the low-lying excited A{sup 2}{Sigma}{sub g}{sup +} state, populated by the absorption of extreme ultraviolet (XUV) photons (38 eV), has been observed at the Free Electron Laser in Hamburg, (FLASH). Recording coincident fragments C{sup +} + CH{sub 2}{sup +} as a function of time between XUV-pump and -probe pulses, generated by a split-mirror device, we find an isomerization time of 52 {+-} 15 fs in a kinetic energy release (KER) window of 5.8 < KER < 8 eV, providing clear evidence for the existence of a fast, nonradiative decay channel.

Jiang, Y.; Rudenko, Artem; Herrwerth, O.; Foucar, L.; Kurka, M.; Kuhnel, K.; Lezius, M.; Kling, Matthias; van Tilborg, Jeroen; Belkacem, Ali; Ueda, K.; Dusterer, S.; Treusch, R.; Schroter, Claus-Dieter; Moshammer, Robbert; Ullrich, Joachim

2011-06-17T23:59:59.000Z

29

Method for the protection of extreme ultraviolet lithography optics  

DOE Patents [OSTI]

A coating for the protection of optical surfaces exposed to a high energy erosive plasma. A gas that can be decomposed by the high energy plasma, such as the xenon plasma used for extreme ultraviolet lithography (EUVL), is injected into the EUVL machine. The decomposition products coat the optical surfaces with a protective coating maintained at less than about 100 .ANG. thick by periodic injections of the gas. Gases that can be used include hydrocarbon gases, particularly methane, PH3 and H2S. The use of PH3 and H2S is particularly advantageous since films of the plasma-induced decomposition products S and P cannot grow to greater than 10 .ANG. thick in a vacuum atmosphere such as found in an EUVL machine.

Grunow, Philip A.; Clift, Wayne M.; Klebanoff, Leonard E.

2010-06-22T23:59:59.000Z

30

Sensitivity calibration of an imaging extreme ultraviolet spectrometer-detector system for determining the efficiency of broadband extreme ultraviolet sources  

SciTech Connect (OSTI)

We report on the absolute sensitivity calibration of an extreme ultraviolet (XUV) spectrometer system that is frequently employed to study emission from short-pulse laser experiments. The XUV spectrometer, consisting of a toroidal mirror and a transmission grating, was characterized at a synchrotron source in respect of the ratio of the detected to the incident photon flux at photon energies ranging from 15.5 eV to 99 eV. The absolute calibration allows the determination of the XUV photon number emitted by laser-based XUV sources, e.g., high-harmonic generation from plasma surfaces or in gaseous media. We have demonstrated high-harmonic generation in gases and plasma surfaces providing 2.3 {mu}W and {mu}J per harmonic using the respective generation mechanisms.

Fuchs, S.; Roedel, C.; Bierbach, J.; Paz, A. E.; Foerster, E.; Paulus, G. G. [Institute of Optics und Quantum Electronics, Friedrich-Schiller-University Jena (Germany); Helmholtz-Institute Jena (Germany); Krebs, M. [Institute of Applied Physics, Friedrich-Schiller-University Jena (Germany); Haedrich, S.; Limpert, J. [Helmholtz-Institute Jena (Germany); Institute of Applied Physics, Friedrich-Schiller-University Jena (Germany); Kuschel, S.; Wuensche, M.; Hilbert, V.; Zastrau, U. [Institute of Optics und Quantum Electronics, Friedrich-Schiller-University Jena (Germany)

2013-02-15T23:59:59.000Z

31

Graphene defect formation by extreme ultraviolet generated photoelectrons  

SciTech Connect (OSTI)

We have studied the effect of photoelectrons on defect formation in graphene during extreme ultraviolet (EUV) irradiation. Assuming the major role of these low energy electrons, we have mimicked the process by using low energy primary electrons. Graphene is irradiated by an electron beam with energy lower than 80?eV. After e-beam irradiation, it is found that the D peak, I(D), appears in the Raman spectrum, indicating defect formation in graphene. The evolution of I(D)/I(G) follows the amorphization trajectory with increasing irradiation dose, indicating that graphene goes through a transformation from microcrystalline to nanocrystalline and then further to amorphous carbon. Further, irradiation of graphene with increased water partial pressure does not significantly change the Raman spectra, which suggests that, in the extremely low energy range, e-beam induced chemical reactions between residual water and graphene are not the dominant mechanism driving defect formation in graphene. Single layer graphene, partially suspended over holes was irradiated with EUV radiation. By comparing with the Raman results from e-beam irradiation, it is concluded that the photoelectrons, especially those from the valence band, contribute to defect formation in graphene during irradiation.

Gao, A., E-mail: a.gao@utwente.nl; Lee, C. J.; Bijkerk, F. [FOM-Dutch Institute for Fundamental Energy Research, Edisonbaan 14, 3439 MN Nieuwegein, The Netherlands and XUV Optics Group, MESA Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE, Enschede (Netherlands)

2014-08-07T23:59:59.000Z

32

AN EXTREME-ULTRAVIOLET WAVE ASSOCIATED WITH A SURGE  

SciTech Connect (OSTI)

Taking advantage of the high temporal and spatial resolution observations from the Solar Dynamics Observatory, we present an extreme-ultraviolet (EUV) wave associated with a surge on 2010 November 13. Due to the magnetic flux cancelation, some surges formed in the source active region (AR). The strongest surge produced our studied event. The surge was deflected by the nearby loops that connected to another AR, and disrupted the overlying loops that slowly expanded and eventually evolved into a weak coronal mass ejection (CME). The surge was likely associated with the core of the CME. The EUV wave happened after the surge deflected. The wave departed far from the flare center and showed a close location relative to the deflected surge. The wave propagated in a narrow angular extent, mainly in the ejection direction of the surge. The close timing and location relations between the EUV wave and the surge indicate that the wave was closely associated with the CME. The wave had a velocity of 310-350 km s{sup -1}, while the speeds of the surge and the expanding loops were about 130 and 150 km s{sup -1}, respectively. All of the results suggest that the EUV wave was a fast-mode wave and was most likely triggered by the weak CME.

Zheng, Ruisheng; Jiang, Yunchun; Yang, Jiayan; Bi, Yi; Hong, Junchao; Yang, Bo; Yang, Dan, E-mail: zhrsh@ynao.ac.cn [National Astronomical Observatories/Yunnan Astronomical Observatory, Chinese Academy of Sciences, Kunming 650011 (China)] [National Astronomical Observatories/Yunnan Astronomical Observatory, Chinese Academy of Sciences, Kunming 650011 (China)

2013-02-10T23:59:59.000Z

33

Dynamics of laser-produced Sn-based plasmas for a monochromatic 13.5 nm extreme ultraviolet source  

E-Print Network [OSTI]

the critical density, a narrower EUV x-ray spectrum and a higher conversion efficiency from laserDynamics of laser-produced Sn-based plasmas for a monochromatic 13.5 nm extreme ultraviolet source-0417 ABSTRACT Dynamics of laser-produced Sn-based plasmas were investigated for a monochromatic EUV lithography

Najmabadi, Farrokh

34

Silicon photodiode with selective Zr/Si coating for extreme ultraviolet spectral range  

SciTech Connect (OSTI)

The procedure of manufacturing silicon photodiodes with an integrated Zr/Si filter for extreme ultraviolet (EUV) spectral range is developed. A setup for measuring the sensitivity profile of detectors with spatial resolution better than 100 {mu}m is fabricated. The optical properties of silicon photodiodes in the EUV and visible spectral ranges are investigated. Some characteristics of SPD-100UV diodes with Zr/Si coating and without it, as well as of AXUV-100 diodes, are compared. In all types of detectors a narrow region beyond the operating aperture is found to be sensitive to the visible light. (photodetectors)

Aruev, P N; Barysheva, Mariya M; Ber, B Ya; Zabrodskaya, N V; Zabrodskii, V V; Lopatin, A Ya; Pestov, Alexey E; Petrenko, M V; Polkovnikov, V N; Salashchenko, Nikolai N; Sukhanov, V L; Chkhalo, Nikolai I

2012-10-31T23:59:59.000Z

35

Time exposure performance of Mo-Au Gibbsian segregating alloys for extreme ultraviolet collector optics  

SciTech Connect (OSTI)

Successful implementation of extreme ultraviolet (EUV) lithography depends on research and progress toward minimizing collector optics degradation from intense plasma erosion and debris deposition. Thus studying the surface degradation process and implementing innovative methods, which could enhance the surface chemistry causing the mirrors to suffer less damage, is crucial for this technology development. A Mo-Au Gibbsian segregation (GS) alloy is deposited on Si using a dc dual-magnetron cosputtering system and the damage is investigated as a result of time dependent exposure in an EUV source. A thin Au segregating layer is maintained through segregation during exposure, even though overall erosion in the Mo-Au sample is taking place in the bulk. The reflective material, Mo, underneath the segregating layer is protected by this sacrificial layer, which is lost due to preferential sputtering. In addition to theoretical work, experimental results are presented on the effectiveness of the GS alloys to be used as potential EUV collector optics material.

Qiu Huatan; Srivastava, Shailendra N.; Thompson, Keith C.; Neumann, Martin J.; Ruzic, David N

2008-05-01T23:59:59.000Z

36

A simple transfer-optics system for an extreme-ultraviolet synchrotron beamline  

SciTech Connect (OSTI)

Radiometric experiments often require comparatively high intensities in the extreme ultraviolet, in the microwatt range. The monochromators that provide the high throughput needed for these experiments, though, do not always allow for end stations to be switched out easily. At the National Institute of Standards and Technology Synchrotron Ultraviolet Radiation Facility, the only beamline with sufficient extreme-ultraviolet power has a multi-ton endstation, which cannot be moved. We will describe a set of transfer optics that allow the photon beam to be collimated and deflected through a port on the downstream end of the large chamber. This allowed an absolute cryogenic radiometer to be attached, with the entrance cavity underfilled. We will describe ray-tracing results and offer preliminary results of the radiometer-based throughput of the system.

Tarrio, C.; Grantham, S.; Vest, R.E.; Liu, K. [Electron and Optical Physics Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8410 (United States)

2005-04-01T23:59:59.000Z

37

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.

38

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

E-Print Network [OSTI]

Liquid-tin-jet laser-plasma extreme ultraviolet generation P. A. C. Jansson,a) B. A. M. Hansson, O spectral signatures. The system is demonstrated using tin Sn as the target due to its strong emission materials with new spectral signatures. As an example we use tin, motivated by its current interest for EUV

39

THE PREFLIGHT PHOTOMETRIC CALIBRATION OF THE EXTREME-ULTRAVIOLET IMAGING TELESCOPE EIT  

E-Print Network [OSTI]

Abstract. This paper presents the preflight photometric calibration of the Extreme-ultraviolet Imaging Telescope (EIT) aboard the Solar and Heliospheric Observatory (SOHO). The EIT consists of a Ritchey–Chrétien telescope with multilayer coatings applied to four quadrants of the primary and secondary mirrors, several filters and a backside-thinned CCD detector. The quadrants of the EIT

K. P. Dere; J. D. Moses; J. -p. Delaboudinière; J. Brunaud; C. Carabetian; J. -f. Hochedez; X. Y. Song; R. C. Catura; F. Clette

1999-01-01T23:59:59.000Z

40

Flexible CO2 laser system for fundamental research related to an extreme ultraviolet lithography source  

E-Print Network [OSTI]

Flexible CO2 laser system for fundamental research related to an extreme ultraviolet lithography 2009; published online 10 December 2009 A CO2 laser system with flexible parameters was developed 1010 W/cm2 . Utilizing this CO2 MOPA laser system, high conversion efficiency from laser to in-band 2

Najmabadi, Farrokh

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

Influence of laser pulse duration on extreme ultraviolet and ion emission features from tin plasmas  

E-Print Network [OSTI]

studies showed that the EUV/x-ray emission from laser-heated clusters are strong function of laser pulseInfluence of laser pulse duration on extreme ultraviolet and ion emission features from tin plasmasLASE Project, Department of Diode-Pumped Lasers, Institute of Physics of the ASCR, Na Slovance 2, 18221 Prague

Harilal, S. S.

42

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

43

Spectral-phase interferometry for direct electric-field reconstruction applied to seeded extreme-ultraviolet free-electron lasers  

E-Print Network [OSTI]

We present a setup for complete characterization of femtosecond pulses generated by seeded free-electron lasers (FEL's) in the extreme-ultraviolet spectral region. Two delayed and spectrally shifted replicas are produced and used for spectral phase interferometry for direct electric field reconstruction (SPIDER). We show that it can be achieved by a simple arrangement of the seed laser. Temporal shape and phase obtained in FEL simulations are well retrieved by the SPIDER reconstruction, allowing to foresee the implementation of this diagnostic on existing and future sources. This will be a significant step towards an experimental investigation and control of FEL spectral phase.

Mahieu, Benoît; De Ninno, Giovanni; Dacasa, Hugo; Lozano, Magali; Rousseau, Jean-Philippe; Zeitoun, Philippe; Garzella, David; Merdji, Hamed

2015-01-01T23:59:59.000Z

44

Method for plasma formation for extreme ultraviolet lithography-theta pinch  

DOE Patents [OSTI]

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

45

Miniature hybrid plasma focus extreme ultraviolet source driven by 10 kA fast current pulse  

SciTech Connect (OSTI)

A miniature hybrid plasma focus device, operated in xenon gas medium and driven by a 10 kA fast current pulse, has been used to generate extreme ultraviolet radiation in the range of 6-15 nm. At present the radiation characteristics from xenon plasma were mainly assessed qualitatively using standard tools such as visible light framing camera, extreme ultraviolet (EUV) pinhole camera, and EUV photodiode. Strong pinching of xenon plasma is indicative from both visible and EUV imagings. The maximum size of the EUV emitting zone is estimated to be of the order of 0.21x1.55 mm and the estimated value is within the accepted value as benchmarked by industries. The EUV intensity measurement by photodiode showed fairly isotropic radiation at least in a half solid angle. This device can be developed further as a competent source for EUV metrology or lithography applications.

Mohanty, S.R.; Sakamoto, T.; Kobayashi, Y.; Song, I.; Watanabe, M.; Kawamura, T.; Okino, A.; Horioka, K.; Hotta, E. [Department of Energy Sciences, Tokyo Institute of Technology, Nagatsuta, Yokohama 226-8502 (Japan)

2006-04-15T23:59:59.000Z

46

Damage of multilayer optics with varying capping layers induced by focused extreme ultraviolet beam  

SciTech Connect (OSTI)

Extreme ultraviolet Mo/Si multilayers protected by capping layers of different materials were exposed to 13.5 nm plasma source radiation generated with a table-top laser to study the irradiation damage mechanism. Morphology of single-shot damaged areas has been analyzed by means of atomic force microscopy. Threshold fluences were evaluated for each type of sample in order to determine the capability of the capping layer to protect the structure underneath.

Jody Corso, Alain; Nicolosi, Piergiorgio; Nardello, Marco; Guglielmina Pelizzo, Maria [National Research Council of Italy, Institute for Photonics and Nanotechnology, via Trasea 7, 35131 Padova (Italy) [National Research Council of Italy, Institute for Photonics and Nanotechnology, via Trasea 7, 35131 Padova (Italy); Department of Information Engineering, University of Padova, via Gradenigo 6/B, 35131 Padova (Italy); Zuppella, Paola [National Research Council of Italy, Institute for Photonics and Nanotechnology, via Trasea 7, 35131 Padova (Italy)] [National Research Council of Italy, Institute for Photonics and Nanotechnology, via Trasea 7, 35131 Padova (Italy); Barkusky, Frank [Laser-Laboratorium Goettingen e.V, Goettingen (Germany) [Laser-Laboratorium Goettingen e.V, Goettingen (Germany); KLA-Tencor, 5 Technology Dr., Milpitas, California 95035 (United States); Mann, Klaus; Mueller, Matthias [Laser-Laboratorium Goettingen e.V, Goettingen (Germany)] [Laser-Laboratorium Goettingen e.V, Goettingen (Germany)

2013-05-28T23:59:59.000Z

47

CITIUS: An infrared-extreme ultraviolet light source for fundamental and applied ultrafast science  

SciTech Connect (OSTI)

We present the main features of CITIUS, a new light source for ultrafast science, generating tunable, intense, femtosecond pulses in the spectral range from infrared to extreme ultraviolet (XUV). The XUV pulses (about 10{sup 5}-10{sup 8} photons/pulse in the range 14-80 eV) are produced by laser-induced high-order harmonic generation in gas. This radiation is monochromatized by a time-preserving monochromator, also allowing one to work with high-resolution bandwidth selection. The tunable IR-UV pulses (10{sup 12}-10{sup 15} photons/pulse in the range 0.4-5.6 eV) are generated by an optical parametric amplifier, which is driven by a fraction of the same laser pulse that generates high order harmonics. The IR-UV and XUV pulses follow different optical paths and are eventually recombined on the sample for pump-probe experiments. We also present the results of two pump-probe experiments: with the first one, we fully characterized the temporal duration of harmonic pulses in the time-preserving configuration; with the second one, we demonstrated the possibility of using CITIUS for selective investigation of the ultra-fast dynamics of different elements in a magnetic compound.

Grazioli, C.; Gauthier, D.; Ivanov, R.; De Ninno, G. [Laboratory of Quantum Optics, University of Nova Gorica, Nova Gorica (Slovenia) [Laboratory of Quantum Optics, University of Nova Gorica, Nova Gorica (Slovenia); Elettra Sincrotrone Trieste, Trieste (Italy)] [Italy; Callegari, C.; Spezzani, C. [Elettra Sincrotrone Trieste, Trieste (Italy)] [Elettra Sincrotrone Trieste, Trieste (Italy); Ciavardini, A. [Sapienza University, Rome (Italy)] [Sapienza University, Rome (Italy); Coreno, M. [Elettra Sincrotrone Trieste, Trieste (Italy) [Elettra Sincrotrone Trieste, Trieste (Italy); Institute of Inorganic Methodologies and Plasmas (CNR-IMIP), Montelibretti, Roma (Italy); Frassetto, F.; Miotti, P.; Poletto, L. [Institute of Photonics and Nanotechnologies (CNR-IFN), Padova (Italy)] [Institute of Photonics and Nanotechnologies (CNR-IFN), Padova (Italy); Golob, D. [Kontrolni Sistemi d.o.o., Sežana (Slovenia)] [Kontrolni Sistemi d.o.o., Sežana (Slovenia); Kivimäki, A. [Institute of Materials Manufacturing (CNR-IOM), TASC Laboratory, Trieste (Italy)] [Institute of Materials Manufacturing (CNR-IOM), TASC Laboratory, Trieste (Italy); Mahieu, B. [Elettra Sincrotrone Trieste, Trieste (Italy) [Elettra Sincrotrone Trieste, Trieste (Italy); Service des Photons Atomes et Molécules, Commissariat à l'Energie Atomique, Centre d'Etudes de Saclay, Bâtiment 522, 91191 Gif-sur-Yvette (France); Bu?ar, B.; Merhar, M. [Laboratory of Mechanical Processing Technologies, University of Ljubljana, Ljubljana (Slovenia)] [Laboratory of Mechanical Processing Technologies, University of Ljubljana, Ljubljana (Slovenia); Polo, E. [Institute of Organic Synthesis and Photoreactivity (CNR-ISOF), Ferrara (Italy)] [Institute of Organic Synthesis and Photoreactivity (CNR-ISOF), Ferrara (Italy); Ressel, B. [Laboratory of Quantum Optics, University of Nova Gorica, Nova Gorica (Slovenia)] [Laboratory of Quantum Optics, University of Nova Gorica, Nova Gorica (Slovenia)

2014-02-15T23:59:59.000Z

48

Quasi-Coherent Oscillations in the Extreme Ultraviolet Flux of the Dwarf Nova SS Cygni  

E-Print Network [OSTI]

Quasi-coherent oscillations have been detected in the extreme ultraviolet flux of the dwarf nova SS Cygni during observations with the Extreme Ultraviolet Explorer satellite of the rise and plateau phases of an anomalous outburst in 1993 August and a normal outburst in 1994 June/July. On both occasions, the oscillation turned on during the rise to outburst and persisted throughout the observation. During the 1993 outburst, the period of the oscillation fell from 9.3 s to 7.5 s over an interval of 4.4 days; during the 1994 outburst, the period fell from 8.9 s to 7.19 s (the shortest period ever observed in SS Cyg, or any other dwarf nova) within less than a day, and then rose to 8.0 s over an interval of 8.0 days. For both outbursts, the period $P$ of the oscillation was observed to correlate with the 75--120 \\AA \\ count rate $I_{\\rm EUV}$ according to $P\\propto I_{\\rm EUV}^{-0.094}$. A magnetospheric model is considered to reproduce this variation. It is found that an effective high-order multipole field is required, and that the field strength at the surface of the white dwarf is 0.1--1 MG. Such a field strength is at the lower extreme of those measured or inferred for bona fide magnetic cataclysmic variables.

Christopher W. Mauche

1996-03-18T23:59:59.000Z

49

Passivating overcoat bilayer for multilayer reflective coatings for extreme ultraviolet lithography  

DOE Patents [OSTI]

A passivating overcoat bilayer is used for multilayer reflective coatings for extreme ultraviolet (EUV) or soft x-ray applications to prevent oxidation and corrosion of the multilayer coating, thereby improving the EUV optical performance. The overcoat bilayer comprises a layer of silicon or beryllium underneath at least one top layer of an elemental or a compound material that resists oxidation and corrosion. Materials for the top layer include carbon, palladium, carbides, borides, nitrides, and oxides. The thicknesses of the two layers that make up the overcoat bilayer are optimized to produce the highest reflectance at the wavelength range of operation. Protective overcoat systems comprising three or more layers are also possible.

Montcalm, Claude (Livermore, CA); Stearns, Daniel G. (Los Altos, CA); Vernon, Stephen P. (Pleasanton, CA)

1999-01-01T23:59:59.000Z

50

Rare-earth plasma extreme ultraviolet sources at 6.5-6.7 nm  

SciTech Connect (OSTI)

We have demonstrated a laser-produced plasma extreme ultraviolet source operating in the 6.5-6.7 nm region based on rare-earth targets of Gd and Tb coupled with a Mo/B{sub 4}C multilayer mirror. Multiply charged ions produce strong resonance emission lines, which combine to yield an intense unresolved transition array. The spectra of these resonant lines around 6.7 nm (in-band: 6.7 nm {+-}1%) suggest that the in-band emission increases with increased plasma volume by suppressing the plasma hydrodynamic expansion loss at an electron temperature of about 50 eV, resulting in maximized emission.

Otsuka, Takamitsu; Higashiguchi, Takeshi; Yugami, Noboru; Yatagai, Toyohiko [Department of Advanced Interdisciplinary Sciences, Center for Optical Research and Education (CORE), Utsunomiya University, Yoto 7-1-2, Utsunomiya, Tochigi 321-8585 (Japan); Kilbane, Deirdre; White, John; Dunne, Padraig; O'Sullivan, Gerry [School of Physics, University College Dublin, Belfield, Dublin 4 (Ireland); Jiang, Weihua [Department of Electrical Engineering, Nagaoka University of Technology, Kami-tomiokamachi 1603-1, Nagaoka, Niigata 940-2188 (Japan); Endo, Akira [Forschungszentrum Dresden, Bautzner Landstrs. 400, D-01328 Dresden (Germany)

2010-09-13T23:59:59.000Z

51

Extreme ultraviolet source at 6.7 nm based on a low-density plasma  

SciTech Connect (OSTI)

We demonstrate an efficient extreme ultraviolet (EUV) source for operation at {lambda} = 6.7 nm by optimizing the optical thickness of gadolinium (Gd) plasmas. Using low initial density Gd targets and dual laser pulse irradiation, we observed a maximum EUV conversion efficiency (CE) of 0.54% for 0.6% bandwidth (BW) (1.8% for 2% BW), which is 1.6 times larger than the 0.33% (0.6% BW) CE produced from a solid density target. Enhancement of the EUV CE by use of a low-density plasma is attributed to the reduction of self-absorption effects.

Higashiguchi, Takeshi; Yugami, Noboru [Department of Advanced Interdisciplinary Sciences, Center for Optical Research and Education (CORE), and Optical Technology Innovation Center (OpTIC), Utsunomiya University, Yoto 7-1-2, Utsunomiya, Tochigi 321-8585 (Japan); Japan Science and Technology Agency, CREST, 4-1-8 Honcho, Kanagawa, Saitama 332-0012 (Japan); Otsuka, Takamitsu [Department of Advanced Interdisciplinary Sciences, Center for Optical Research and Education (CORE), and Optical Technology Innovation Center (OpTIC), Utsunomiya University, Yoto 7-1-2, Utsunomiya, Tochigi 321-8585 (Japan); Jiang, Weihua [Department of Electrical Engineering, Nagaoka University of Technology, Kami-tomiokamachi 1603-1, Nagaoka, Niigata 940-2188 (Japan); Endo, Akira [Research Institute for Science and Engineering, Waseda University, Okubo 3-4-1, Shinjuku, Tokyo 169-8555 (Japan); Li Bowen; Kilbane, Deirdre; Dunne, Padraig; O'Sullivan, Gerry [School of Physics, University College Dublin, Belfield, Dublin 4 (Ireland)

2011-11-07T23:59:59.000Z

52

Note: Enhancement of the extreme ultraviolet emission from a potassium plasma by dual laser irradiation  

SciTech Connect (OSTI)

Emission spectra from multiply charged potassium ions ranging from K{sup 3+} to K{sup 5+} have been obtained in the extreme ultraviolet (EUV) spectral region. A strong emission feature peaking around 38?nm, corresponding to a photon energy of 32.6 eV, is the dominant spectral feature at time-averaged electron temperatures in the range of 8?12 eV. The variation of this emission with laser intensity and the effects of pre-pulses on the relative conversion efficiency (CE) have been explored experimentally and indicate that an enhancement of about 30% in EUV CE is readily attainable.

Higashiguchi, Takeshi, E-mail: higashi@cc.utsunomiya-u.ac.jp; Yamaguchi, Mami; Otsuka, Takamitsu; Nagata, Takeshi [Department of Advanced Interdisciplinary Sciences and Center for Optical Research (CORE), Utsunomiya University, Yoto 7-1-2, Utsunomiya, Tochigi 321-8585 Japan (Japan); Ohashi, Hayato [Graduate School of Science and Engineering for Research, University of Toyama, Toyama, Toyama 930-8555 (Japan); Li, Bowen [School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000 (China); School of Physics, University College Dublin, Belfield, Dublin 4 (Ireland); D’Arcy, Rebekah; Dunne, Padraig; O’Sullivan, Gerry [School of Physics, University College Dublin, Belfield, Dublin 4 (Ireland)

2014-09-15T23:59:59.000Z

53

Validity of the thin mask approximation in extreme ultraviolet mask roughness simulations  

SciTech Connect (OSTI)

In the case of extreme ultraviolet (EUV) lithography, modeling has shown that reflector phase roughness on the lithographic mask is a significant concern due to the image plan speckle it causes and the resulting line-edge roughness on imaged features. Modeling results have recently been used to determine the requirements for future production worthy masks yielding the extremely stringent specification of 50 pm rms roughness. Owing to the scale of the problem in terms of memory requirements, past modeling results have all been based on the thin mask approximation. EUV masks, however, are inherently three dimensional in nature and thus the question arises as to the validity of the thin mask approximation. Here we directly compare image plane speckle calculation results using the fast two dimensional thin mask model to rigorous finite-difference time-domain results and find the two methods to be comparable.

Naulleau, Patrick; George, Simi

2011-01-26T23:59:59.000Z

54

Plasma radiation dynamics with the upgraded Absolute Extreme Ultraviolet tomographical system in the Tokamak à Configuration Variable  

SciTech Connect (OSTI)

We introduce an upgraded version of a tomographical system which is built up from Absolute Extreme Ultraviolet-type (AXUV) detectors and has been installed on the Tokamak à Configuration Variable (TCV). The system is suitable for the investigation of fast radiative processes usually observed in magnetically confined high-temperature plasmas. The upgrade consists in the detector protection by movable shutters, some modifications to correct original design errors and the improvement in the data evaluation techniques. The short-term sensitivity degradation of the detectors, which is caused by the plasma radiation itself, has been monitored and found to be severe. The results provided by the system are consistent with the measurements obtained with the usual plasma radiation diagnostics installed on TCV. Additionally, the coupling between core plasma radiation and plasma-wall interaction is revealed. This was impossible with other available diagnostics on TCV.

Tal, B.; Nagy, D.; Veres, G. [Institute for Particle and Nuclear Physics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, Association EURATOM, P. O. Box 49, H-1525 Budapest (Hungary)] [Institute for Particle and Nuclear Physics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, Association EURATOM, P. O. Box 49, H-1525 Budapest (Hungary); Labit, B.; Chavan, R.; Duval, B. [Ecole Polytechnique Fédérale de Lausanne (EPFL), Centre de Recherches en Physique des Plasmas, Association EURATOM-Confédération Suisse, EPFL SB CRPP, Station 13, CH-1015 Lausanne (Switzerland)] [Ecole Polytechnique Fédérale de Lausanne (EPFL), Centre de Recherches en Physique des Plasmas, Association EURATOM-Confédération Suisse, EPFL SB CRPP, Station 13, CH-1015 Lausanne (Switzerland)

2013-12-15T23:59:59.000Z

55

Dissociative multiple ionization of diatomic molecules by extreme-ultraviolet free-electron-laser pulses  

SciTech Connect (OSTI)

Nuclear dynamics in dissociative multiple ionization processes of diatomic molecules exposed to extreme-ultraviolet free-electron-laser pulses is studied theoretically using the Monte Carlo wave packet approach. By simulated detection of the emitted electrons, the model reduces a full propagation of the system to propagations of the nuclear wave packet in one specific electronic charge state at a time. Suggested ionization channels can be examined, and kinetic energy release spectra for the nuclei can be calculated and compared with experiments. Double ionization of O{sub 2} is studied as an example, and good agreement with published experimental data is obtained by simulating the dynamics on ten different electronic Born-Oppenheimer curves.

Leth, Henriette Astrup; Madsen, Lars Bojer [Lundbeck Foundation Theoretical Center for Quantum System Research, Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C (Denmark)

2011-06-15T23:59:59.000Z

56

Response of a SiC Photodiode to Extreme Ultraviolet through Visible Radiation  

SciTech Connect (OSTI)

The responsivity of a type 6H-SiC photodiode in the 1.5-400 nm wavelength range was measured using synchrotron radiation. The responsivity was 0.20 A/W at 270 nm and was less than 0.10 A/W in the extreme ultraviolet (EUV) region. The responsivity was calculated using a proven optical model that accounted for the reflection and absorption of the incident radiation and the variation of the charge collection efficiency (CCE) with depth into the device. The CCE was determined from the responsivity measured in the 200-400 nm wavelength range. By use of this CCE and the effective pair creation energy (7.2 eV) determined from x-ray absorption measurements, the EUV responsivity was accurately modeled with no free parameters. The measured visible-light sensitivity, although low compared with that of a silicon photodiode, was surprisingly high for this wide bandgap semiconductor.

Seely,J.; Kjornrattanawanich, B.; Holland, G.; Korde, R.

2005-01-01T23:59:59.000Z

57

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

58

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

E-Print Network [OSTI]

Optimization of extreme ultraviolet photons emission and collection in mass-limited laser produced in DPP or with pre-pulsing in LPP provide wide area for optimization in regards to conversion efficiency and collection as well as calculating photons source location and size. We optimized several parameters of dual

Harilal, S. S.

59

HOMOLOGOUS EXTREME ULTRAVIOLET WAVES IN THE EMERGING FLUX REGION OBSERVED BY THE SOLAR DYNAMICS OBSERVATORY  

SciTech Connect (OSTI)

Taking advantage of the high temporal and spatial resolution of the Solar Dynamics Observatory (SDO) observations, we present four homologous extreme ultraviolet (EUV) waves within 3 hr on 2010 November 11. All EUV waves emanated from the same emerging flux region (EFR), propagated in the same direction, and were accompanied by surges, weak flares, and faint coronal mass ejections (CMEs). The waves had the basically same appearance in all EUV wavebands of the Atmospheric Imaging Assembly on SDO. The waves propagated at constant velocities in the range of 280-500 km s{sup -1}, with little angular dependence, which indicated that the homologous waves could be likely interpreted as fast-mode waves. The waves are supposed to likely involve more than one driving mechanism, and it was most probable that the waves were driven by the surges, due to their close timing and location relations. We also propose that the homologous waves were intimately associated with the continuous emergence and cancellation of magnetic flux in the EFR, which could supply sufficient energy and trigger the onsets of the waves.

Zheng Ruisheng; Jiang Yunchun; Yang Jiayan; Bi Yi; Hong Junchao; Yang, B.; Yang Dan, E-mail: zhrsh@ynao.ac.cn [National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011 (China)

2012-03-01T23:59:59.000Z

60

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

SciTech Connect (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

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

Hot-electron-driven charge transfer processes on O2 Pt,,111... surface probed by ultrafast extreme-ultraviolet pulses  

E-Print Network [OSTI]

it with an ultrafast laser pulse, charge transfer induced changes in the platinum-oxygen bond were observedHot-electron-driven charge transfer processes on O2 Ã?Pt,,111... surface probed by ultrafast extreme-ultraviolet pulses C. Lei,1, * M. Bauer,2 K. Read,1 R. Tobey,1 Y. Liu,3 T. Popmintchev,1 M. M. Murnane,1 and H. C

Bauer, Michael

62

High-peak-power surface high-harmonic generation at extreme ultra-violet wavelengths from a tape  

SciTech Connect (OSTI)

Solid-based surface high-harmonic generation from a tape is experimentally studied. By operating at mildly relativistic normalized laser strengths a{sub 0}?0.2, harmonics up to the 17th order are efficiently produced in the coherent wake emission (CWE) regime. CWE pulse properties, such as divergence, energy, conversion efficiency, and spectrum, are investigated for various tape materials and drive laser conditions. A clear correlation between surface roughness and harmonic beam divergence is found. At the measured pulse properties for the 15th harmonic (conversion efficiency ?6.5×10{sup ?7}, divergence ?7?15 mrad), the 100-mJ-level drive laser produces several MWs of extreme ultra-violet pulses. The spooling tape configuration enables multi-Hz operation over thousands of shots, making this source attractive as a seed to the few-Hz laser-plasma-accelerator-driven free-electron laser (FEL). Models indicate that these CWE pulses with MW level powers are sufficient for seed-induced bunching and FEL gain.

Shaw, B. H. [Lawrence Berkeley National Lab, Berkeley, California 94720 (United States) [Lawrence Berkeley National Lab, Berkeley, California 94720 (United States); Applied Science and Technology, University of California, Berkeley, California 94720 (United States); Tilborg, J. van; Sokollik, T.; Schroeder, C. B.; McKinney, W. R.; Artemiev, N. A.; Yashchuk, V. V.; Gullikson, E. M. [Lawrence Berkeley National Lab, Berkeley, California 94720 (United States)] [Lawrence Berkeley National Lab, Berkeley, California 94720 (United States); Leemans, W. P. [Lawrence Berkeley National Lab, Berkeley, California 94720 (United States) [Lawrence Berkeley National Lab, Berkeley, California 94720 (United States); Physics Department, University of California, Berkeley, California 94720 (United States)

2013-07-28T23:59:59.000Z

63

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

SciTech Connect (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

64

THE FIRST STRAY LIGHT CORRECTED EXTREME-ULTRAVIOLET IMAGES OF SOLAR CORONAL HOLES  

SciTech Connect (OSTI)

Coronal holes are the source regions of the fast solar wind, which fills most of the solar system volume near the cycle minimum. Removing stray light from extreme-ultraviolet (EUV) images of the Sun's corona is of high astrophysical importance, as it is required to make meaningful determinations of temperatures and densities of coronal holes. EUV images tend to be dominated by the component of the stray light due to the long-range scatter caused by the microroughness of telescope mirror surfaces, and this component has proven very difficult to measure in pre-flight characterization. In-flight characterization heretofore has proven elusive due to the fact that the detected image is simultaneously nonlinear in two unknown functions: the stray light pattern and the true image that would be seen by an ideal telescope. Using a constrained blind deconvolution technique that takes advantage of known zeros in the true image provided by a fortuitous lunar transit, we have removed the stray light from solar images seen by the EUVI instrument on STEREO-B in all four filter bands (171, 195, 284, and 304 A). Uncertainty measures of the stray light corrected images, which include the systematic error due to misestimation of the scatter, are provided. It is shown that in EUVI, stray light contributes up to 70% of the emission in coronal holes seen on the solar disk, which has dramatic consequences for diagnostics of temperature and density and therefore estimates of key plasma parameters such as the plasma {beta} and ion-electron collision rates.

Shearer, Paul; Gilbert, Anna C. [Department of Mathematics, 2074 East Hall, University of Michigan, 530 Church St., Ann Arbor, MI 48109-1043 (United States); Frazin, Richard A. [Department of Atmospheric, Oceanic and Space Science, Space Research Building, University of Michigan, 2455 Hayward St., Ann Arbor, MI 48109-2143 (United States); Hero III, Alfred O., E-mail: shearerp@umich.edu, E-mail: annacg@umich.edu, E-mail: rfrazin@umich.edu, E-mail: hero@umich.edu [Department of Electrical Engineering and Computer Science, The College of Engineering, University of Michigan, 1301 Beal Avenue, Ann Arbor, MI 48109-2122 (United States)

2012-04-10T23:59:59.000Z

65

An extreme ultraviolet Michelson interferometer for experiments at free-electron lasers  

SciTech Connect (OSTI)

We present a Michelson interferometer for 13.5 nm soft x-ray radiation. It is characterized in a proof-of-principle experiment using synchrotron radiation, where the temporal coherence is measured to be 13 fs. The curvature of the thin-film beam splitter membrane is derived from the observed fringe pattern. The applicability of this Michelson interferometer at intense free-electron lasers is investigated, particularly with respect to radiation damage. This study highlights the potential role of such Michelson interferometers in solid density plasma investigations using, for instance, extreme soft x-ray free-electron lasers. A setup using the Michelson interferometer for pseudo-Nomarski-interferometry is proposed.

Hilbert, Vinzenz; Fuchs, Silvio; Paulus, Gerhard G.; Zastrau, Ulf [Institute of Optics and Quantum Electronics, Friedrich-Schiller University Jena, Max-Wien-Platz 1, 07743 Jena (Germany)] [Institute of Optics and Quantum Electronics, Friedrich-Schiller University Jena, Max-Wien-Platz 1, 07743 Jena (Germany); Blinne, Alexander [Institute for Theoretical Physics, Friedrich-Schiller University Jena, Max-Wien-Platz 1, 07743 Jena (Germany)] [Institute for Theoretical Physics, Friedrich-Schiller University Jena, Max-Wien-Platz 1, 07743 Jena (Germany); Feigl, Torsten [Fraunhofer Institute for Applied Optics and Precision Engineering, Albert-Einstein-Straße 7, 07745 Jena (Germany)] [Fraunhofer Institute for Applied Optics and Precision Engineering, Albert-Einstein-Straße 7, 07745 Jena (Germany); Kämpfer, Tino; Rödel, Christian; Uschmann, Ingo; Wünsche, Martin; Förster, Eckhart [Institute of Optics and Quantum Electronics, Friedrich-Schiller University Jena, Max-Wien-Platz 1, 07743 Jena (Germany) [Institute of Optics and Quantum Electronics, Friedrich-Schiller University Jena, Max-Wien-Platz 1, 07743 Jena (Germany); Helmholtz Institute, Fröbelstieg 3, 07743 Jena (Germany)

2013-09-15T23:59:59.000Z

66

Ionization and dissociation dynamics of vinyl bromide probed by femtosecond extreme ultraviolet transient absorption spectroscopy  

SciTech Connect (OSTI)

Strong-field induced ionization and dissociation dynamics of vinyl bromide, CH{sub 2}=CHBr, are probed using femtosecond extreme ultraviolet (XUV) transient absorption spectroscopy. Strong-field ionization is initiated with an intense femtosecond, near infrared (NIR, 775 nm) laser field. Femtosecond XUV pulses covering the photon energy range of 50-72 eV probe the subsequent dynamics by measuring the time-dependent spectroscopic features associated with transitions of the Br (3d) inner-shell electrons to vacancies in molecular and atomic valence orbitals. Spectral signatures are observed for the depletion of neutral C{sub 2}H{sub 3}Br, the formation of C{sub 2}H{sub 3}Br{sup +} ions in their ground (X{sup ~}) and first excited (A{sup ~}) states, the production of C{sub 2}H{sub 3}Br{sup ++} ions, and the appearance of neutral Br ({sup 2}P{sub 3/2}) atoms by dissociative ionization. The formation of free Br ({sup 2}P{sub 3/2}) atoms occurs on a timescale of 330 ± 150 fs. The ionic A{sup ~} state exhibits a time-dependent XUV absorption energy shift of ?0.4 eV within the time window of the atomic Br formation. The yield of Br atoms correlates with the yield of parent ions in the A{sup ~} state as a function of NIR peak intensity. The observations suggest that a fraction of vibrationally excited C{sub 2}H{sub 3}Br{sup +} (A{sup ~}) ions undergoes intramolecular vibrational energy redistribution followed by the C–Br bond dissociation. The C{sub 2}H{sub 3}Br{sup +} (X{sup ~}) products and the majority of the C{sub 2}H{sub 3}Br{sup ++} ions are relatively stable due to a deeper potential well and a high dissociation barrier, respectively. The results offer powerful new insights about orbital-specific electronic processes in high field ionization, coupled vibrational relaxation and dissociation dynamics, and the correlation of valence hole-state location and dissociation in polyatomic molecules, all probed simultaneously by ultrafast table-top XUV spectroscopy.

Lin, Ming-Fu; Neumark, Daniel M. [Ultrafast X-ray Science Laboratory, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States) [Ultrafast X-ray Science Laboratory, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Department of Chemistry, University of California, Berkeley, California 94720 (United States); Gessner, Oliver [Ultrafast X-ray Science Laboratory, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)] [Ultrafast X-ray Science Laboratory, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Leone, Stephen R. [Ultrafast X-ray Science Laboratory, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States) [Ultrafast X-ray Science Laboratory, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Department of Chemistry, University of California, Berkeley, California 94720 (United States); Department of Physics, University of California, Berkeley, California 94720 (United States)

2014-02-14T23:59:59.000Z

67

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

SciTech Connect (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

68

Spatio-temporal coherence of free-electron laser radiation in the extreme ultraviolet determined by a Michelson interferometer  

SciTech Connect (OSTI)

A key feature of extreme ultraviolet (XUV) radiation from free-electron lasers (FELs) is its spatial and temporal coherence. We measured the spatio-temporal coherence properties of monochromatized FEL pulses at 13.5?nm using a Michelson interferometer. A temporal coherence time of (59±8) fs has been determined, which is in good agreement with the spectral bandwidth given by the monochromator. Moreover, the spatial coherence in vertical direction amounts to about 15% of the beam diameter and about 12% in horizontal direction. The feasibility of measuring spatio-temporal coherence properties of XUV FEL radiation using interferometric techniques advances machine operation and experimental studies significantly.

Hilbert, V.; Rödel, C.; Zastrau, U., E-mail: ulf.zastrau@uni-jena.de [Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, Max-Wien-Platz 1, 07743 Jena (Germany); Brenner, G.; Düsterer, S.; Dziarzhytski, S.; Harmand, M.; Przystawik, A.; Redlin, H.; Toleikis, S. [Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg (Germany); Döppner, T.; Ma, T. [Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550 (United States); Fletcher, L. [Department of Physics, University of California, Berkeley, California 94720 (United States); Förster, E. [Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, Max-Wien-Platz 1, 07743 Jena (Germany); Helmholtz-Institut Jena, Fröbelstieg 3, 07743 Jena (Germany); Glenzer, S. H.; Lee, H. J. [SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025 (United States); Hartley, N. J. [Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU (United Kingdom); Kazak, L.; Komar, D.; Skruszewicz, S. [Institut für Physik, Universität Rostock, 18051 Rostock (Germany); and others

2014-09-08T23:59:59.000Z

69

Time dependent changes in extreme ultraviolet reflectivity of Ru mirrors from electron-induced surface chemistry  

E-Print Network [OSTI]

for Materials Under Extreme Environment, School of Nuclear Engineering Purdue University, West Lafayette verified by Auger electron spectroscopy (AES). Moreover, the impact on EUV reflectivity (EUVR) with time

Harilal, S. S.

70

Method for high-precision multi-layered thin film deposition for deep and extreme ultraviolet mirrors  

DOE Patents [OSTI]

A method for coating (flat or non-flat) optical substrates with high-reflectivity multi-layer coatings for use at Deep Ultra-Violet (DUV) and Extreme Ultra-Violet (EUV) wavelengths. The method results in a product with minimum feature sizes of less than 0.10 [micro]m for the shortest wavelength (13.4 nm). The present invention employs a computer-based modeling and deposition method to enable lateral and vertical thickness control by scanning the position of the substrate with respect to the sputter target during deposition. The thickness profile of the sputter targets is modeled before deposition and then an appropriate scanning algorithm is implemented to produce any desired, radially-symmetric thickness profile. The present invention offers the ability to predict and achieve a wide range of thickness profiles on flat or figured substrates, i.e., account for 1/R[sup 2] factor in a model, and the ability to predict and accommodate changes in deposition rate as a result of plasma geometry, i.e., over figured substrates. 15 figs.

Ruffner, J.A.

1999-06-15T23:59:59.000Z

71

Extended-range grazing-incidence spectrometer for high-resolution extreme ultraviolet measurements on an electron beam ion trap  

SciTech Connect (OSTI)

A high-resolution grazing-incidence grating spectrometer has been implemented on the Livermore electron beam ion traps for performing very high-resolution measurements in the soft x-ray and extreme ultraviolet region spanning from below 10 Å to above 300 Å. The instrument operates without an entrance slit and focuses the light emitted by highly charged ions located in the roughly 50 ?m wide electron beam onto a cryogenically cooled back-illuminated charge-coupled device detector. The measured line widths are below 0.025 Å above 100 Å, and the resolving power appears to be limited by the source size and Doppler broadening of the trapped ions. Comparisons with spectra obtained with existing grating spectrometers show an order of magnitude improvement in spectral resolution.

Beiersdorfer, P.; Magee, E. W.; Brown, G. V.; Träbert, E.; Widmann, K. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Hell, N. [Lawrence Livermore National Laboratory, Livermore, California 94550 (United States); Dr. Remeis-Sternwarte and ECAP, Universität Erlangen-Nürnberg, 96049 Bamberg (Germany)

2014-11-15T23:59:59.000Z

72

Investigations into ultraviolet matrix-assisted laser desorption  

SciTech Connect (OSTI)

Matrix-assisted laser desorption (MALD) is a technique for converting large biomolecules into gas phase ions. Some characteristics of the commonly used uv matrices are determined. Solubilities in methanol range from 0.1 to 0.5 M. Solid phase absorption spectra are found to be similar to solution, but slightly red-shifted. Acoustic and quartz crystal microbalance signals are investigated as possible means of uv-MALD quantitation. Evidence for the existence of desorption thresholds is presented. Threshold values are determined to be in the range of 2 to 3 MW/cm{sup 2}. A transient imaging technique based on laser-excited fluorescence for monitoring MALD plumes is described. Sensitivity is well within the levels required for studying matrix-assisted laser desorption, where analyte concentrations are significantly lower than those in conventional laser desorption. Results showing the effect of film morphology, particularly film thickness, on plume dynamics are presented. In particular, MALD plumes from thicker films tend to exhibit higher axial velocities. Fluorescent labeling of protein and of DNA is used to allow imaging of their uv-MALD generated plumes. Integrated concentrations are available with respect to time, making it possible to assess the rate of fragmentation. The spatial and temporal distributions are important for the design of secondary ionization schemes to enhance ion yields and for the optimization of ion collection in time-of-flight MS instruments to maximize resolution. Such information could also provide insight into whether ionization is closely associated with the desorption step or whether it is a result of subsequent collisions with the matrix gas (e.g., proton transfer). Although the present study involves plumes in a normal atmosphere, adaptation to measurements in vacuum (e.g., inside a mass spectrometer) should be straightforward.

Heise, T.W.

1993-07-01T23:59:59.000Z

73

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

74

DIFFRACTION, REFRACTION, AND REFLECTION OF AN EXTREME-ULTRAVIOLET WAVE OBSERVED DURING ITS INTERACTIONS WITH REMOTE ACTIVE REGIONS  

SciTech Connect (OSTI)

We present observations of the diffraction, refraction, and reflection of a global extreme-ultraviolet (EUV) wave propagating in the solar corona. These intriguing phenomena are observed when the wave interacts with two remote active regions, and together they exhibit properties of an EUV wave. When the wave approached AR11465, it became weaker and finally disappeared in the active region, but a few minutes later a new wavefront appeared behind the active region, and it was not concentric with the incoming wave. In addition, a reflected wave was also simultaneously observed on the wave incoming side. When the wave approached AR11459, it transmitted through the active region directly and without reflection. The formation of the new wavefront and the transmission could be explained with diffraction and refraction effects, respectively. We propose that the different behaviors observed during the interactions may be caused by different speed gradients at the boundaries of the two active regions. We find that the EUV wave formed ahead of a group of expanding loops a few minutes after the start of the loops' expansion, which represents the initiation of the associated coronal mass ejection (CME). Based on these results, we conclude that the EUV wave should be a nonlinear magnetosonic wave or shock driven by the associated CME, which propagated faster than the ambient fast mode speed and gradually slowed down to an ordinary linear wave. Our observations support the hybrid model that includes both fast wave and slow non-wave components.

Shen Yuandeng; Liu Yu; Zhao Ruijuan; Tian Zhanjun [Yunnan Astronomical Observatory, Chinese Academy of Sciences, Kunming 650011 (China); Su Jiangtao [Key Laboratory of Solar Activity, Chinese Academy of Sciences, Beijing 100012 (China); Li Hui [Key Laboratory of Dark Matter and Space Astronomy, Chinese Academy of Sciences, Nanjing 210008 (China); Ichimoto, Kiyoshi; Shibata, Kazunari, E-mail: ydshen@ynao.ac.cn [Kwasan and Hida Observatories, Kyoto University, Kyoto 6078471 (Japan)

2013-08-20T23:59:59.000Z

75

Tuning extreme ultraviolet emission for optimum coupling with multilayer mirrors for future lithography through control of ionic charge states  

SciTech Connect (OSTI)

We report on the identification of the optimum plasma conditions for a laser-produced plasma source for efficient coupling with multilayer mirrors at 6.x nm for beyond extreme ultraviolet lithography. A small shift to lower energies of the peak emission for Nd:YAG laser-produced gadolinium plasmas was observed with increasing laser power density. Charge-defined emission spectra were observed in electron beam ion trap (EBIT) studies and the charge states responsible identified by use of the flexible atomic code (FAC). The EBIT spectra displayed a larger systematic shift of the peak wavelength of intense emission at 6.x nm to longer wavelengths with increasing ionic charge. This combination of spectra enabled the key ion stage to be confirmed as Gd{sup 18+}, over a range of laser power densities, with contributions from Gd{sup 17+} and Gd{sup 19+} responsible for the slight shift to longer wavelengths in the laser-plasma spectra. The FAC calculation also identified the origin of observed out-of-band emission and the charge states responsible.

Ohashi, Hayato, E-mail: ohashi@cc.utsunomiya-u.ac.jp; Higashiguchi, Takeshi, E-mail: higashi@cc.utsunomiya-u.ac.jp; Suzuki, Yuhei; Kawasaki, Masato [Department of Advanced Interdisciplinary Sciences, Center for Optical Research and Education (CORE), Utsunomiya University, Yoto 7-1-2, Utsunomiya, Tochigi 321-8585 (Japan); Li, Bowen; Dunne, Padraig; O'Sullivan, Gerry [School of Physics, University College Dublin, Belfield, Dublin 4 (Ireland); Kanehara, Tatsuhiko; Aida, Yuya; Nakamura, Nobuyuki [Institute for Laser Science, The University of Electro-Communications, Chofu, Tokyo 182-8585 (Japan); Torii, Shuichi; Makimura, Tetsuya [Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8573 (Japan); Jiang, Weihua [Department of Electrical Engineering, Nagaoka University of Technology, Kami-tomiokamachi 1603-1, Nagaoka, Niigata 940-2188 (Japan)

2014-01-21T23:59:59.000Z

76

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

SciTech Connect (OSTI)

The authors report the chemical influence of cleaning of the Ru capping layer on the extreme ultraviolet (EUV) reflector surface. The cleaning of EUV reflector to remove the contamination particles has two requirements: to prevent corrosion and etching of the reflector surface and to maintain the reflectivity functionality of the reflector after the corrosive cleaning processes. Two main approaches for EUV reflector cleaning, wet chemical treatments [sulfuric acid and hydrogen peroxide mixture (SPM), ozonated water, and ozonated hydrogen peroxide] and dry cleaning (oxygen plasma and UV/ozone treatment), were tested. The changes in surface morphology and roughness were characterized using scanning electron microscopy and atomic force microscopy, while the surface etching and change of oxidation states were probed with x-ray photoelectron spectroscopy. Significant surface oxidation of the Ru capping layer was observed after oxygen plasma and UV/ozone treatment, while the oxidation is unnoticeable after SPM treatment. Based on these surface studies, the authors found that SPM treatment exhibits the minimal corrosive interactions with Ru capping layer. They address the molecular mechanism of corrosive gas and liquid-phase chemical interaction with the surface of Ru capping layer on the EUV reflector.

Belau, Leonid; Park, Jeong Y.; Liang, Ted; Seo, Hyungtak; Somorjai, Gabor A.

2009-04-10T23:59:59.000Z

77

An upper limit on the ratio between the Extreme Ultraviolet and the bolometric luminosities of stars hosting habitable planets  

E-Print Network [OSTI]

A large number of terrestrial planets in the classical habitable zone of stars of different spectral types has already been discovered and many are expected to be discovered in near future. However, owing to the lack of knowledge on the atmospheric properties, the ambient environment of such planets are unknown. It is known that sufficient amount of Extreme Ultraviolet (EUV) radiation from the star can drive hydrodynamic outflow of hydrogen that may drag heavier species from the atmosphere of the planet. If the rate of mass loss is sufficiently high then substantial amount of volatiles would escape causing the planet to become uninhabitable. Considering energy-limited hydrodynamical mass loss with an escape rate that causes oxygen to escape along with hydrogen, I present an upper limit for the ratio between the EUV and the bolometric luminosities of stars which constrains the habitability of planets around them. Application of the limit to planet-hosting stars with known EUV luminosities implies that many M-t...

Sengupta, Sujan

2015-01-01T23:59:59.000Z

78

BRIGHT POINTS AND JETS IN POLAR CORONAL HOLES OBSERVED BY THE EXTREME-ULTRAVIOLET IMAGING SPECTROMETER ON HINODE  

SciTech Connect (OSTI)

We present observations of polar coronal hole bright points (BPs) made with the Extreme-ultraviolet Imaging Spectrometer (EIS) on the Hinode spacecraft. The data consist of raster images of BPs in multiple spectral lines from mostly coronal ions, e.g., Fe X-Fe XV. The BPs are observed for short intervals and thus the data are snapshots of the BPs obtained during their evolution. The images reveal a complex unresolved temperature structure (EIS resolution is about 2''), with the highest temperature being about 2 x 10{sup 6} K. Some BPs appear as small loops with temperatures that are highest near the top. But others are more point-like with surrounding structures. However, the thermal time evolution of the BPs is an important factor in their appearance. A BP may appear quite different at different times. We discuss one BP with an associated jet that is bright enough to allow statistically meaningful measurements. The jet Doppler speed along the line of sight is about 15-20 km s{sup -1}. Electron densities of the BPs and the jet are typically near 10{sup 9} cm{sup -3}, which implies path lengths along the line of sight on the order of a few arcsec. We also construct differential emission measure curves for two of the best observed BPs. High spatial resolution (significantly better than 1'') is required to fully resolve the BP structures.

Doschek, G. A.; Landi, E.; Warren, H. P. [Space Science Division, Naval Research Laboratory, Washington, DC 20375 (United States); Harra, L. K., E-mail: george.doschek@nrl.navy.mi [Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT (United Kingdom)

2010-02-20T23:59:59.000Z

79

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

SciTech Connect (OSTI)

The development of multilayer optics for extreme ultraviolet (EUV) radiation has led to advancements in many areas of science and technology, including materials studies, EUV lithography, water window microscopy, plasma imaging, and orbiting solar physics imaging. Recent developments in femtosecond and attosecond EUV pulse generation from sources such as high harmonic generation lasers, combined with the elemental and chemical specificity provided by EUV radiation, are opening new opportunities to study fundamental dynamic processes in materials. Critical to these efforts is the design and fabrication of multilayer optics to transport, focus, shape and image these ultra-fast pulses This thesis describes the design, fabrication, characterization, and application of multilayer optics for EUV femtosecond and attosecond scientific studies. Multilayer mirrors for bandwidth control, pulse shaping and compression, tri-material multilayers, and multilayers for polarization control are described. Characterization of multilayer optics, including measurement of material optical constants, reflectivity of multilayer mirrors, and metrology of reflected phases of the multilayer, which is critical to maintaining pulse size and shape, were performed. Two applications of these multilayer mirrors are detailed in the thesis. In the first application, broad bandwidth multilayers were used to characterize and measure sub-100 attosecond pulses from a high harmonic generation source and was performed in collaboration with the Max-Planck institute for Quantum Optics and Ludwig- Maximilians University in Garching, Germany, with Professors Krausz and Kleineberg. In the second application, multilayer mirrors with polarization control are useful to study femtosecond spin dynamics in an ongoing collaboration with the T-REX group of Professor Parmigiani at Elettra in Trieste, Italy. As new ultrafast x-ray sources become available, for example free electron lasers, the multilayer designs described in this thesis can be extended to higher photon energies, and such designs can be used with those sources to enable new scientific studies, such as molecular bonding, phonon, and spin dynamics.

Aquila, Andrew Lee

2009-05-21T23:59:59.000Z

80

CHROMOSPHERIC EVAPORATION IN AN M1.8 FLARE OBSERVED BY THE EXTREME-ULTRAVIOLET IMAGING SPECTROMETER ON HINODE  

SciTech Connect (OSTI)

We discuss observations of chromospheric evaporation for a complex flare that occurred on 2012 March 9 near 03:30 UT obtained from the Extreme-ultraviolet Imaging Spectrometer (EIS) on board the Hinode spacecraft. This was a multiple event with a strong energy input that reached the M1.8 class when observed by EIS. EIS was in raster mode and fortunately the slit was almost at the exact location of a significant energy input. Also, EIS obtained a full-CCD spectrum of the flare, i.e., the entire CCD was readout so that data were obtained for about the 500 lines identified in the EIS wavelength ranges. Chromospheric evaporation characterized by 150-200 km s{sup -1} upflows was observed in multiple locations in multi-million degree spectral lines of flare ions such as Fe XXII, Fe XXIII, and Fe XXIV, with simultaneous 20-60 km s{sup -1} upflows in million degree coronal lines from ions such as Fe XII-Fe XVI. The behavior of cooler, transition region ions such as O VI, Fe VIII, He II, and Fe X is more complex, but upflows were also observed in Fe VIII and Fe X lines. At a point close to strong energy input in space and time, the flare ions Fe XXII, Fe XXIII, and Fe XXIV reveal an isothermal source with a temperature close to 14 MK and no strong blueshifted components. At this location there is a strong downflow in cooler active region lines from ions such as Fe XIII and Fe XIV, on the order of 200 km s{sup -1}. We speculate that this downflow may be evidence of the downward shock produced by reconnection in the current sheet seen in MHD simulations. A sunquake also occurred near this location. Electron densities were obtained from density sensitive lines ratios from Fe XIII and Fe XIV. Atmospheric Imaging Assembly (AIA) observations from the Solar Dynamics Observatory are used with JHelioviewer to obtain a qualitative overview of the flare. However, AIA data are not presented in this paper. In summary, spectroscopic data from EIS are presented that can be used for predictive tests of models of chromospheric evaporation as envisaged in the Standard Flare Model.

Doschek, G. A.; Warren, H. P. [Space Science Division, Naval Research Laboratory, Washington, DC 20375 (United States)] [Space Science Division, Naval Research Laboratory, Washington, DC 20375 (United States); Young, P. R. [College of Science, George Mason University, 4400 University Drive, Fairfax, VA 22030 (United States)] [College of Science, George Mason University, 4400 University Drive, Fairfax, VA 22030 (United States)

2013-04-10T23:59:59.000Z

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

EVIDENCE FOR THE WAVE NATURE OF AN EXTREME ULTRAVIOLET WAVE OBSERVED BY THE ATMOSPHERIC IMAGING ASSEMBLY ON BOARD THE SOLAR DYNAMICS OBSERVATORY  

SciTech Connect (OSTI)

Extreme-ultraviolet (EUV) waves have been found for about 15 years. However, significant controversy remains over their physical natures and origins. In this paper, we report an EUV wave that was accompanied by an X1.9 flare and a partial halo coronal mass ejection (CME). Using high temporal and spatial resolution observations taken by the Solar Dynamics Observatory and the Solar-TErrestrial RElations Observatory, we are able to investigate the detailed kinematics of the EUV wave. We find several arguments that support the fast-mode wave scenario. (1) The speed of the EUV wave (570 km s{sup -1}) is higher than the sound speed of the quiet-Sun corona. (2) Significant deceleration of the EUV wave (-130 m s{sup -2}) is found during its propagation. (3) The EUV wave resulted in the oscillations of a loop and a filament along its propagation path, and a reflected wave from the polar coronal hole is also detected. (4) Refraction or reflection effect is observed when the EUV wave was passing through two coronal bright points. (5) The dimming region behind the wavefront stopped to expand when the wavefront started to become diffuse. (6) The profiles of the wavefront exhibited a dispersive nature, and the magnetosonic Mach number of the EUV wave derived from the highest intensity jump is about 1.4. In addition, triangulation indicates that the EUV wave propagated within a height range of about 60-100 Mm above the photosphere. We propose that the EUV wave observed should be a nonlinear fast-mode magnetosonic wave that propagated freely in the corona after it was driven by the CME expanding flanks during the initial period.

Shen Yuandeng; Liu Yu, E-mail: ydshen@ynao.ac.cn [Yunnan Astronomical Observatory, Chinese Academy of Sciences, Kunming 650011 (China)

2012-07-20T23:59:59.000Z

82

The Effects of Oxygen Plasma on the Chemical Composition and Morphology of the Ru Capping Layer of the Extreme Ultraviolet (EUV) Mask Blanks  

SciTech Connect (OSTI)

Contamination removal from extreme ultraviolet (EUV) mask surfaces is one of the most important aspects to improve reliability for the next generation of EUV lithography. We report chemical and morphological changes of the ruthenium (Ru) mask surface after oxygen plasma treatment using surface sensitive analytical methods: X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and transmission electron microscopy (TEM). Chemical analysis of the EUV masks shows an increase in the subsurface oxygen concentration, Ru oxidation and surface roughness. XPS spectra at various photoelectron takeoff angles suggest that the EUV mask surface was covered with chemisorbed oxygen after oxygen plasma treatment. It is proposed that the Kirkendall effect is the most plausible mechanism that explains the Ru surface oxidation. The etching rate of the Ru capping layer by oxygen plasma was estimated to be 1.5 {+-} 0.2 {angstrom}/min, based on TEM cross sectional analysis.

Belau, Leonid; Park, Jeong Y.; Liang, Ted; Somorjai, Gabor A.

2008-06-07T23:59:59.000Z

83

Generation of circularly polarized radiation from a compact plasma-based extreme ultraviolet light source for tabletop X-ray magnetic circular dichroism studies  

SciTech Connect (OSTI)

Generation of circularly polarized light in the extreme ultraviolet (EUV) spectral region (about 25 eV–250 eV) is highly desirable for applications in spectroscopy and microscopy but very challenging to achieve in a small-scale laboratory. We present a compact apparatus for generation of linearly and circularly polarized EUV radiation from a gas-discharge plasma light source between 50 eV and 70 eV photon energy. In this spectral range, the 3p absorption edges of Fe (54 eV), Co (60 eV), and Ni (67 eV) offer a high magnetic contrast often employed for magneto-optical and electron spectroscopy as well as for magnetic imaging. We simulated and designed an instrument for generation of linearly and circularly polarized EUV radiation and performed polarimetric measurements of the degree of linear and circular polarization. Furthermore, we demonstrate first measurements of the X-ray magnetic circular dichroism at the Co 3p absorption edge with a plasma-based EUV light source. Our approach opens the door for laboratory-based, element-selective spectroscopy of magnetic materials and spectro-microscopy of ferromagnetic domains.

Wilson, Daniel; Rudolf, Denis, E-mail: d.rudolf@fz-juelich.de; Juschkin, Larissa [RWTH Aachen University, Experimental Physics of EUV, Steinbachstraße 15, 52074 Aachen (Germany); Forschungszentrum Jülich GmbH, Peter Grünberg Institut (PGI-9), JARA-FIT, 52425 Jülich (Germany); Weier, Christian; Adam, Roman; Schneider, Claus M. [Forschungszentrum Jülich GmbH, Peter Grünberg Institut (PGI-6), JARA-FIT, 52425 Jülich (Germany); Winkler, Gerrit; Frömter, Robert [Institut für Angewandte Physik, Universität Hamburg, Jungiusstraße 11, 20355 Hamburg (Germany); Danylyuk, Serhiy [RWTH Aachen University, Chair for Technology of Optical Systems, JARA-FIT, Steinbachstraße 15, 52074 Aachen (Germany); Bergmann, Klaus [Fraunhofer Institute for Laser Technology, Steinbachstrasse 15, 52074 Aachen (Germany); Grützmacher, Detlev [Forschungszentrum Jülich GmbH, Peter Grünberg Institut (PGI-9), JARA-FIT, 52425 Jülich (Germany)

2014-10-15T23:59:59.000Z

84

FAST EXTREME-ULTRAVIOLET DIMMING ASSOCIATED WITH A CORONAL JET SEEN IN MULTI-WAVELENGTH AND STEREOSCOPIC OBSERVATIONS  

SciTech Connect (OSTI)

We have investigated a coronal jet observed near the limb on 2010 June 27 by the Hinode/X-Ray Telescope (XRT), EUV Imaging Spectrograph (EIS), and Solar Optical Telescope (SOT), and by the Solar Dynamics Observatory (SDO)/Atmospheric Imaging Assembly (AIA), and on the disk by STEREO-A/EUVI. From EUV (AIA and EIS) and soft X-ray (XRT) images we have identified both cool and hot jets. There was a small loop eruption seen in Ca II images of the SOT before the jet eruption. We found that the hot jet preceded its associated cool jet by about 2 minutes. The cool jet showed helical-like structures during the rising period which was supported by the spectroscopic analysis of the jet's emission. The STEREO observation, which enabled us to observe the jet projected against the disk, showed dimming at 195 A along a large loop connected to the jet. We measured a propagation speed of {approx}800 km s{sup -1} for the dimming front. This is comparable to the Alfven speed in the loop computed from a magnetic field extrapolation of the photospheric field measured five days earlier by the SDO/Helioseismic and Magnetic Imager, and the loop densities obtained from EIS Fe XIV {lambda}264.79/274.20 line ratios. We interpret the dimming as indicating the presence of Alfvenic waves initiated by reconnection in the upper chromosphere.

Lee, K.-S.; Moon, Y.-J.; Lee, Jin-Yi [Department of Astronomy and Space Science, Kyung Hee University, Yongin 446-701 (Korea, Republic of)] [Department of Astronomy and Space Science, Kyung Hee University, Yongin 446-701 (Korea, Republic of); Innes, D. E. [Max Plank Institute for Solar System Research, D-37191 Katlenburg-Lindau (Germany)] [Max Plank Institute for Solar System Research, D-37191 Katlenburg-Lindau (Germany); Shibata, K. [Kwasan and Hida Observatories, Kyoto University, Yamashina, Kyoto 607-8471 (Japan)] [Kwasan and Hida Observatories, Kyoto University, Yamashina, Kyoto 607-8471 (Japan); Park, Y.-D., E-mail: lksun@khu.ac.kr [Solar and Space Weather Research Group, Korea Astronomy and Space Science Institute, Daejeon 305-348 (Korea, Republic of)

2013-03-20T23:59:59.000Z

85

Investigating the effective range of vacuum ultraviolet-mediated breakdown in high-power microwave metamaterials  

SciTech Connect (OSTI)

Metamaterials and periodic structures operating under high-power excitations are susceptible to breakdown. It was recently demonstrated that a localized breakdown created in a given region of a periodic structure can facilitate breakdown in other regions of the structure where the intensity of the incident electromagnetic fields may not be high enough to cause breakdown under normal circumstances. It was also demonstrated that this phenomenon is due to the generation of vacuum ultraviolet radiation at the location of the initial discharge, which propagates to the neighboring regions (e.g., other unit cells in a periodic structure) and facilitates the generation of a discharge at a lower incident power level. In this paper, we present the results of an experimental study conducted to determine the effective range of this physical phenomenon for periodic structures that operate in air and in pure nitrogen gas at atmospheric pressure levels. It is demonstrated that when breakdown is induced in a periodic structure using a high-power pulse with a frequency of 9.382 GHz, duration of 0.8??s, and peak power level of 25?kW, this phenomenon is highly likely to happen in radii of approximately 16–17?mm from the location of the initial discharge under these test conditions. The results of this study are significant in designing metamaterials and periodic structures for high-power microwave applications as they suggest that a localized discharge created in such a periodic structure with a periodicity less than 16–17?mm can spread over a large surface and result in a distributed discharge.

Liu, Chien-Hao, E-mail: cliu82@wisc.edu; Neher, Joel D., E-mail: jdneher@wisc.edu; Booske, John H., E-mail: booske@engr.wisc.edu; Behdad, Nader, E-mail: behdad@wisc.edu [Department of Electrical and Computer Engineering, University of Wisconsin-Madison, 1415 Engineering Drive, Madison, Wisconsin 53706 (United States)

2014-10-14T23:59:59.000Z

86

SECONDARY WAVES AND/OR THE 'REFLECTION' FROM AND 'TRANSMISSION' THROUGH A CORONAL HOLE OF AN EXTREME ULTRAVIOLET WAVE ASSOCIATED WITH THE 2011 FEBRUARY 15 X2.2 FLARE OBSERVED WITH SDO/AIA AND STEREO/EUVI  

SciTech Connect (OSTI)

For the first time, the kinematic evolution of a coronal wave over the entire solar surface is studied. Full Sun maps can be made by combining images from the Solar Terrestrial Relations Observatory satellites, Ahead and Behind, and the Solar Dynamics Observatory, thanks to the wide angular separation between them. We study the propagation of a coronal wave, also known as the 'Extreme Ultraviolet Imaging Telescope' wave, and its interaction with a coronal hole (CH) resulting in secondary waves and/or reflection and transmission. We explore the possibility of the wave obeying the law of reflection. In a detailed example, we find that a loop arcade at the CH boundary cascades and oscillates as a result of the extreme ultraviolet (EUV) wave passage and triggers a wave directed eastward that appears to have reflected. We find that the speed of this wave decelerates to an asymptotic value, which is less than half of the primary EUV wave speed. Thanks to the full Sun coverage we are able to determine that part of the primary wave is transmitted through the CH. This is the first observation of its kind. The kinematic measurements of the reflected and transmitted wave tracks are consistent with a fast-mode magnetohydrodynamic wave interpretation. Eventually, all wave tracks decelerate and disappear at a distance. A possible scenario of the whole process is that the wave is initially driven by the expanding coronal mass ejection and subsequently decouples from the driver and then propagates at the local fast-mode speed.

Olmedo, Oscar; Vourlidas, Angelos [Space Science Division, U.S. Naval Research Laboratory, Washington, DC 20375 (United States); Zhang Jie [School of Physics, Astronomy and Computational Sciences, George Mason University, 4400 University Drive, Fairfax, VA 22030 (United States); Cheng Xin, E-mail: oscar.olmedo.ctr@nrl.navy.mil [School of Astronomy and Space Science, Nanjing University, Nanjing 210093 (China)

2012-09-10T23:59:59.000Z

87

Multiple pulse thermal damage thresholds of materials for x-ray free electron laser optics investigated with an ultraviolet laser  

SciTech Connect (OSTI)

Optical elements to be used for x-ray free electron lasers (XFELs) must withstand multiple high-fluence pulses. We have used an ultraviolet laser to study the damage of two candidate materials, crystalline Si and B{sub 4}C-coated Si, emulating the temperature profile expected to occur in optics exposed to XFEL pulses. We found that the damage threshold for 10{sup 5} pulses is {approx}20% to 70% lower than the melting threshold.

Hau-Riege, Stefan P.; London, Richard A.; Bionta, Richard M.; Soufli, Regina; Ryutov, Dmitri; Shirk, Michael; Baker, Sherry L. [Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94539 (United States); Smith, Patrick M.; Nataraj, Pradeep [Kovio, Inc., 1145 Sonora Court, Sunnyvale, California 94086 (United States)

2008-11-17T23:59:59.000Z

88

Investigation of carbon dioxide phase shift possibility under extreme Antarctic winter conditions  

E-Print Network [OSTI]

The Antarctic winter atmosphere minimal temperature and pressure series reveal that $CO_2$ phase shift (deposition) is possible in some extreme cases, even leading to possible $CO_2$ snow phenomenon at Vostok Antarctic station and in other near South Pole regions. A hypothesis has been formulated that stable $CO_2$ snow cover might have formed in Earth past which may influence interpretation of glacial chronology records. This effect may also manifest in other minor gases. Its global climate role is discussed.

Vashchenko, V M

2014-01-01T23:59:59.000Z

89

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

SciTech Connect (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 <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

90

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

SciTech Connect (OSTI)

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

91

Extreme Ultraviolet Spectroscopy of the Solar Corona  

E-Print Network [OSTI]

range of spectroscopic diagnostic tech- niques to determine the temperature distribution, densities a factor of 2 lower than in the quiet sun, with much lower emission measures at temperatures above 106 K been used to infer the temperature structure and the element abundances. The importance of including

Del Zanna, Giulio

92

Extreme Tourism  

E-Print Network [OSTI]

Broadcast Transcript: The stereotype of the Japanese tourist with his camera has been taken to an extreme by one Toshifumi Fujimoto. Mr. Fujimoto likes to don camo clothing and sneak up to the front lines of international ...

Hacker, Randi

2013-03-13T23:59:59.000Z

93

Extremal quantum protocols  

E-Print Network [OSTI]

Generalized quantum instruments correspond to measurements where the input and output are either states or more generally quantum circuits. These measurements describe any quantum protocol including games, communications, and algorithms. The set of generalized quantum instruments with a given input and output structure is a convex set. Here we investigate the extremal points of this set for the case of finite dimensional quantum systems and generalized instruments with finitely many outcomes. We derive algebraic necessary and sufficient conditions for extremality.

Giacomo Mauro D'Ariano; Paolo Perinotti; Michal Sedlak

2011-01-25T23:59:59.000Z

94

Extreme superstarclusters  

E-Print Network [OSTI]

The presence of superstarclusters is a characteristic feature of starburst galaxies. We examine the properties of star forming regions and young star clusters in various environments, ranging from common to extreme. We then discuss new high spatial resolution mid-infrared imaging and spectroscopy of extreme superstarclusters in the obscured region of the Antennae (NGC4038-4039). We find that the PAH emission in this region is not dominated by the superstarclusters but is mostly diffuse. Emission line ratios found in our high spatial resolution data differ significantly from those in larger apertures, strongly affecting the derived results.

Paul P. van der Werf; Leonie Snijders

2006-01-19T23:59:59.000Z

95

Extreme Users WHY engage with extreme users  

E-Print Network [OSTI]

Extreme Users METHOD WHY engage with extreme users HOW to engage extreme users Designers engage inspiration from their work-arounds and frameworks. When you speak with and observe extreme users, their needs extreme users are often also needs of a wider population. Determine who's extreme Determining who

Prinz, Friedrich B.

96

Psoriasis and ultraviolet radiation  

SciTech Connect (OSTI)

Prevention and detection screening programs as a public health service in curtailing the ever-increasing incidence of all forms of skin cancer are reviewed. The effect of solar and artificial ultraviolet radiation on the general population and persons with psoriasis is examined. 54 refs.

Farber, E.M.; Nall, L. (Psoriasis Research Institute, Palo Alto, CA (United States))

1993-09-01T23:59:59.000Z

97

Ultrafast Extreme Ultraviolet Induced Isomerization of Acetylene Cations  

E-Print Network [OSTI]

PHYSICAL REVIEW LETTERS PRL 105, 263002 (2010) week endingAmerican Physical Society PRL 105, 263002 (2010) PHYSICALcould not be distinguished. PRL 105, 263002 (2010) PHYSICAL

Jiang, Y.

2012-01-01T23:59:59.000Z

98

Corner Rounding in Photoresists for Extreme Ultraviolet Lithography  

SciTech Connect (OSTI)

Deprotection blur in EUV resists fundamentally limits the smallest sized dense features that can be patterned in a single exposure and development step. Several metrics have recently been developed to explore the ways that different resist and process parameters affect the deprotection blur in EUV resists. One of these metrics is based on the imaging fidelity of a sharp corner on a large feature. As this metric has involved the close inspection of printing fidelity of corner features, it has brought attention to an interesting phenomena: corners print differently whether or not the remaining resist edge contains 270 degrees of resist or 90 degrees of resist. Here we present experimental data across a wide sampling of leading resists to show this effect is real and reproducible. They provide aerial image modeling results assuming thin and realistic mask models that show no corner bias between the aerial images in the 90-degree and 270-degree configurations. They also compare modeled patterning results assuming several resist models including the single blur, dual blur, and Prolith models, none of which reproduce the corner biasing that is observed experimentally.

Anderson, Christopher N.; Naulleau, Patrick; Deng, Yunfei; Wallow, Thomas

2008-06-01T23:59:59.000Z

99

PROMINENCE PLASMA DIAGNOSTICS THROUGH EXTREME-ULTRAVIOLET ABSORPTION  

SciTech Connect (OSTI)

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

100

Volume extreme ultraviolet holographic imaging with numerical optical sectioning  

E-Print Network [OSTI]

.2960) Image analysis References and Links 1. J. E. Trebes, S. B. Brown, E. M. Campbell, D. L. Matthews, D. G. Nilson, G. F. Stone, and D. A. Whelan, "Demonstration of X-Ray holography with an X-Ray laser," Science, 1788-1800 (1996). 3. I. McNulty, J. Kirz, C. Jacobsen, E. Anderson, M. R. Howells, and D. P. Kern

Rocca, Jorge J.

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

Erosion resistant nozzles for laser plasma extreme ultraviolet (EUV) sources  

DOE Patents [OSTI]

A gas nozzle having an increased resistance to erosion from energetic plasma particles generated by laser plasma sources. By reducing the area of the plasma-facing portion of the nozzle below a critical dimension and fabricating the nozzle from a material that has a high EUV transmission as well as a low sputtering coefficient such as Be, C, or Si, it has been shown that a significant reduction in reflectance loss of nearby optical components can be achieved even after exposing the nozzle to at least 10.sup.7 Xe plasma pulses.

Kubiak, Glenn D. (Livermore, CA); Bernardez, II, Luis J. (Tracy, CA)

2000-01-04T23:59:59.000Z

102

THE EXTREME HOSTS OF EXTREME SUPERNOVAE  

SciTech Connect (OSTI)

We use GALEX ultraviolet (UV) and optical integrated photometry of the hosts of 17 luminous supernovae (LSNe, having peak M{sub V} < -21) and compare them to a sample of 26, 000 galaxies from a cross-match between the SDSS DR4 spectral catalog and GALEX interim release 1.1. We place the LSN hosts on the galaxy NUV - r versus M{sub r} color-magnitude diagram (CMD) with the larger sample to illustrate how extreme they are. The LSN hosts appear to favor low-density regions of the galaxy CMD falling on the blue edge of the blue cloud toward the low-luminosity end. From the UV-optical photometry, we estimate the star formation history of the LSN hosts. The hosts have moderately low star formation rates (SFRs) and low stellar masses (M{sub *}) resulting in high specific star formation rates (sSFR). Compared with the larger sample, the LSN hosts occupy low-density regions of a diagram plotting sSFR versus M{sub *} in the area having higher sSFR and lower M{sub *}. This preference for low M{sub *}, high sSFR hosts implies that the LSNe are produced by an effect having to do with their local environment. The correlation of mass with metallicity suggests that perhaps wind-driven mass loss is the factor that prevents LSNe from arising in higher-mass, higher-metallicity hosts. The massive progenitors of the LSNe (>100 M{sub sun}), by appearing in low-SFR hosts, are potential tests for theories of the initial mass function that limit the maximum mass of a star based on the SFR.

Neill, James D.; Quimby, Robert; Ofek, Eran; Wyder, Ted K.; Martin, D. Christopher; Barlow, Tom A.; Foster, Karl; Friedman, Peter G.; Morrissey, Patrick [California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125 (United States); Sullivan, Mark [University of Oxford, Denys Wilkinson Building, Keble Road, Oxford, OX1 3RH (United Kingdom); Gal-Yam, Avishay [Department of Particle Physics and Astrophysics, Faculty of Physics, Weizmann Institute of Science, 76100 Rehovot (Israel); Howell, D. Andrew [Las Cumbres Observatory Global Telescope Network, 6740 Cortona Dr., Suite 102, Goleta, CA 93117 (United States); Nugent, Peter [Lawrence Berkeley National Laboratory, MS 50F-1650, 1 Cyclotron Road, Berkeley, CA 94720-8139 (United States); Seibert, Mark [The Observatories of the Carnegie Institute of Washington, 813 Santa Barbara Street, Pasadena, CA 91101 (United States); Overzier, Roderik [Max-Planck-Institut fuer Astrophysik, Karl-Schwarzschild-Str. 1, D-85748 Garching (Germany); Neff, Susan G. [Laboratory for Astronomy and Solar Physics, NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States); Schiminovich, David [Department of Astronomy, Columbia University, New York, NY 10027 (United States); Bianchi, Luciana [Center for Astrophysical Sciences, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218 (United States); Donas, Jose [Laboratoire d'Astrophysique de Marseille, BP 8, Traverse du Siphon, 13376 Marseille Cedex 12 (France); Heckman, Timothy M. [Department of Physics and Astronomy, The Johns Hopkins University, Homewood Campus, Baltimore, MD 21218 (United States)

2011-01-20T23:59:59.000Z

103

Extremal Graph Problems, Degenerate Extremal Problems,  

E-Print Network [OSTI]

Extremal Graph Problems, Degenerate Extremal Problems, and Supersaturated Graphs Mikl´os Simonovits´an-type extremal problem. The graphs attaining the maximum will be called extremal and their family will be denoted and multi- ple edges. In 1940, P. Tur´an posed and solved the extremal problem of Kp+1, the complete graph

Simonovits, Miklós

104

The dangers of extremes  

E-Print Network [OSTI]

of quantum corrections to extreme black holes indicate noeffects [10]. The dangers of extremes 8. Ori, A. : StructureFOUNDATION The dangers of extremes Donald Marolf Published

Marolf, Donald

2010-01-01T23:59:59.000Z

105

Mineralogy under extreme conditions  

SciTech Connect (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

106

Type B Accident Investigation Board Report on the June 2002 High Radiation Dose to Extremities in Building 151, Lawrence Livermore National Laboratory  

Broader source: Energy.gov [DOE]

This report is an independent product of the Type B Accident Investigation Board appointed by Camille Yuan-Soo Hoo, Manager of the U.S. Department of Energy, Oakland Operations Office.

107

Extremal quantum cloning machines  

E-Print Network [OSTI]

We investigate the problem of cloning a set of states that is invariant under the action of an irreducible group representation. We then characterize the cloners that are "extremal" in the convex set of group covariant cloning machines, among which one can restrict the search for optimal cloners. For a set of states that is invariant under the discrete Weyl-Heisenberg group, we show that all extremal cloners can be unitarily realized using the so-called "double-Bell states", whence providing a general proof of the popular ansatz used in the literature for finding optimal cloners in a variety of settings. Our result can also be generalized to continuous-variable optimal cloning in infinite dimensions, where the covariance group is the customary Weyl-Heisenberg group of displacements.

G. Chiribella; G. M. D'Ariano; P. Perinotti; N. J. Cerf

2005-07-14T23:59:59.000Z

108

Extreme Optimization Announcements  

E-Print Network [OSTI]

Extreme Optimization Announcements Assignment 3 due tomorrow @ 5pm. No late days on Extreme, we will hold extra office hours during regular section times. #12;Extreme Optimization Extreme University Fall 2014 #12;Extreme Optimization The radiotherapy problem Saving Lives: Radiotherapy Radiation

Chen, Yiling

109

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

110

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

111

The irradiation hardness of CdTe solar cells was inves-tigated for extremely high fluence of protons (up to  

E-Print Network [OSTI]

by introduction of defects. Investigations of polycrystalline thin film cells like CuInSe2 (CIS), Cu(In,Ga)Se2 radiation stability, superior to monocrys- talline cells and also slightly superior to other thin film cells of high effi- ciency monocrystalline Si and III-V cells. The stability against particle irradiation

Romeo, Alessandro

112

The effects of cerium doping on the size, morphology, and optical properties of ?-hematite nanoparticles for ultraviolet filtration  

SciTech Connect (OSTI)

Highlights: • Possible application of cerium-doped ?-hematite as ultraviolet filter. • Nanoparticles obtained through co-precipitation technique using various cerium doping levels followed by annealing. • Comprehensive materials characterisation utilizing XRD, DSC/TGA, STEM, UV–vis spectroscopy. • Increasing cerium content reduces particle sizing and alters morphology. • Solubility of cerium in hematite seen between 5 and 10% doping, 10% cerium doping greatly enhances attenuation in ultraviolet region and increases optical bandgap. - Abstract: Metal oxide nanoparticles have potential use in energy storage, electrode materials, as catalysts and in the emerging field of nanomedicine. Being able to accurately tailor the desirable properties of these nanoceramic materials, such as particle size, morphology and optical bandgap (E{sub g}) is integral in the feasibility of their use. In this study we investigate the altering of both the structure and physical properties through the doping of hematite (?-Fe{sub 2}O{sub 3}) nanocrystals with cerium at a range of concentrations, synthesised using a one-pot co-precipitation method. This extremely simple synthesis followed by thermal treatment results in stable Fe{sub 2?x}Ce{sub x}O{sub y} nanoceramics resulting from the burning of any unreacted precursors and transformation of goethite-cerium doped nanoparticle intermediate. The inclusion of Ce into the crystal lattice of these ?-Fe{sub 2}O{sub 3} nanoparticles causes a significantly large reduction in mean crystalline size and alteration in particle morphology with increasing cerium content. Finally we report an increase optical semiconductor bandgap, along with a substantial increase in the ultraviolet attenuation found for a 10% Ce-doping concentration which shows the potential application of cerium-doped hematite nanocrystals to be used as a pigmented ultraviolet filter for cosmetic products.

Cardillo, Dean [Institute for Superconducting and Electronic Materials, AIIM Facility, University of Wollongong Innovation Campus, Squires Way, North Wollongong, NSW 2500 (Australia); Konstantinov, Konstantin, E-mail: konstan@uow.edu.au [Institute for Superconducting and Electronic Materials, AIIM Facility, University of Wollongong Innovation Campus, Squires Way, North Wollongong, NSW 2500 (Australia); Devers, Thierry [Centre de Recherche sur la Matière Divisée, Institut de Physique, site de Chartres, Université d’Orléans (France)

2013-11-15T23:59:59.000Z

113

Ultraviolet-radiation-curable paints  

SciTech Connect (OSTI)

In product finishing lines, ultraviolet radiation curing of paints on prefabricated structures could be more energy efficient than curing by natural gas fired ovens, and could eliminate solvent emission. Diffuse ultraviolet light can cure paints on three dimensional metal parts. In the uv curing process, the spectral output of radiation sources must complement the absorption spectra of pigments and photoactive agents. Photosensitive compounds, such as thioxanthones, can photoinitiate unsaturated resins, such as acrylated polyurethanes, by a free radical mechanism. Newly developed cationic photoinitiators, such as sulfonium or iodonium salts (the so-called onium salts) of complex metal halide anions, can be used in polymerization of epoxy paints by ultraviolet light radiation. One-coat enamels, topcoats, and primers have been developed which can be photoinitiated to produce hard, adherent films. This process has been tested in a laboratory scale unit by spray coating these materials on three-dimensional objects and passing them through a tunnel containing uv lamps.

Grosset, A M; Su, W F.A.; Vanderglas, E

1981-09-30T23:59:59.000Z

114

Measurement and analysis of near ultraviolet solar radiation  

SciTech Connect (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

115

Investigating the Synthesis of Ligated Metal Clusters in Solution Using a  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: Vegetation ProposedUsingFunInfrared LandResponses toInvestigating Extreme UltravioletInvestigatingFlow

116

Extreme Value Theory, Extreme Temperatures, and demonstration of extRemes  

E-Print Network [OSTI]

Extreme Value Theory, Extreme Temperatures, and demonstration of extRemes Eric Gilleland, National;Extremes Toolkit (extRemes) Web Page http://www.isse.ucar.edu/extremevalues/evtk.html #12;Background on Extreme Value Analysis (EVA) Motivation Central Limit Theorem Extremal Types Theorem Normal (light tail

Gilleland, Eric

117

Wafer chamber having a gas curtain for extreme-UV lithography  

DOE Patents [OSTI]

An EUVL device includes a wafer chamber that is separated from the upstream optics by a barrier having an aperture that is permeable to the inert gas. Maintaining an inert gas curtain in the proximity of a wafer positioned in a chamber of an extreme ultraviolet lithography device can effectively prevent contaminants from reaching the optics in an extreme ultraviolet photolithography device even though solid window filters are not employed between the source of reflected radiation, e.g., the camera, and the wafer. The inert gas removes the contaminants by entrainment.

Kanouff, Michael P. (Livermore, CA); Ray-Chaudhuri, Avijit K. (Livermore, CA)

2001-01-01T23:59:59.000Z

118

The Extremes Toolkit (extRemes) Weather and Climate Applications  

E-Print Network [OSTI]

The Extremes Toolkit (extRemes) Weather and Climate Applications of Extreme Value Statistics Eric;The Extremes Toolkit (extRemes) Web Page http://www.assessment.ucar.edu/toolkit Acknowledgements 1. The Extremes Toolkit is funded by the National Science Foundation (NSF) through the NCAR Weather and Cli- mate

Gilleland, Eric

119

Maximal rank of extremal marginal tracial states  

E-Print Network [OSTI]

States on coupled quantum system whose restrictions to each subsystems are normalized traces are called marginal tracial states. We investigate extremal marginal tracial states and maximal rank of such states. Diagonal marginal tracial states are also considered.

Hiromichi Ohno

2009-11-18T23:59:59.000Z

120

Climate Extremes in the Southeast United States: Observed Variability, Spatial Classification, and Related Planning.  

E-Print Network [OSTI]

??Spatial and temporal trends in temperature and precipitation extremes were investigated for the Southeast United States for the period 1948 to 2012 using 27 extreme… (more)

Powell, Emily J.

2014-01-01T23:59:59.000Z

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.


121

Extremal generalized quantum measurements  

E-Print Network [OSTI]

A measurement on a section K of the set of states of a finite dimensional C*-algebra is defined as an affine map from K to a probability simplex. Special cases of such sections are used in description of quantum networks, in particular quantum channels. Measurements on a section correspond to equivalence classes of so-called generalized POVMs, which are called quantum testers in the case of networks. We find extremality conditions for measurements on K and characterize generalized POVMs such that the corresponding measurement is extremal. These results are applied to the set of channels. We find explicit extremality conditions for two outcome measurements on qubit channels and give an example of an extremal qubit 1-tester such that the corresponding measurement is not extremal.

Anna Jencova

2012-07-23T23:59:59.000Z

122

FORECAST VERIFICATION OF EXTREMES: USE OF EXTREME VALUE THEORY  

E-Print Network [OSTI]

1 FORECAST VERIFICATION OF EXTREMES: USE OF EXTREME VALUE THEORY Rick Katz Institute for Study ON EXTREMES · Emil Gumbel (1891 ­ 1966) -- Pioneer in application of statistics of extremes (Germany, France) Conventional Methods (3) Extreme Value Theory (EVT) (4) Application of EVT to Verification (5) Frost

Katz, Richard

123

FORECAST VERIFICATION OF EXTREMES: USE OF EXTREME VALUE THEORY  

E-Print Network [OSTI]

1 FORECAST VERIFICATION OF EXTREMES: USE OF EXTREME VALUE THEORY Rick Katz Institute for Study on Extremes · Emil Gumbel (1891 ­ 1966) -- Pioneer in application of statistics of extremes "Il est impossible que l'improbable n'arrive jamais." #12;3 OUTLINE (1) Motivation (2) Conventional Methods (3) Extreme

Katz, Richard

124

FORECAST VERIFICATION OF EXTREMES: USE OF EXTREME VALUE THEORY  

E-Print Network [OSTI]

1 FORECAST VERIFICATION OF EXTREMES: USE OF EXTREME VALUE THEORY Rick Katz Institute for Study ON EXTREMES · Emil Gumbel (1891 ­ 1966) -- Pioneer in application of statistics of extremes "Il est impossible que l'improbable n'arrive jamais." #12;3 OUTLINE (1) Motivation (2) Conventional Methods (3) Extreme

Katz, Richard

125

Microgap ultra-violet detector  

DOE Patents [OSTI]

A microgap ultra-violet detector of photons with wavelengths less than 400 run (4,000 Angstroms) which comprises an anode and a cathode separated by a gas-filled gap and having an electric field placed across the gap is disclosed. 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. 2 figs.

Wuest, C.R.; Bionta, R.M.

1994-09-20T23:59:59.000Z

126

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

127

Extremal asymmetric universal cloning machines  

E-Print Network [OSTI]

The trade-offs among various output fidelities of asymmetric universal cloning machines are investigated. First we find out all the attainable optimal output fidelities for the 1 to 3 asymmetric universal cloning machine and it turns out that there are two kinds of extremal asymmetric cloning machines which have to cooperate in order to achieve some of the optimal output fidelities. Second we construct a family of extremal cloning machines that includes the universal symmetric cloning machine as well as an asymmetric 1 to $1+N$ cloning machine for qudits with two different output fidelities such that the optimal trade-off between the measurement disturbance and state estimation is attained in the limit of infinite $N$.

Mingming Jiang; Sixia Yu

2012-02-08T23:59:59.000Z

128

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

129

Impact of externally forced changes on temperature extremes.  

E-Print Network [OSTI]

??This thesis investigates changes in temperature extremes between 1950-2005, analysing gridded data sets of observations and climate model simulations. It focuses on changes in the… (more)

Morak, Simone

2013-01-01T23:59:59.000Z

130

A combined climate extremes index for the Australian Region .  

E-Print Network [OSTI]

??Changes in the area of Australia experiencing concurrent temperature and rainfall extremes are investigated through the use of two combined indices. The indices describe variations… (more)

Gallant, Ailie J. E.

2010-01-01T23:59:59.000Z

131

DETERMINING OPTICAL CONSTANTS OF URANIUM NITRIDE THIN FILMS IN THE EXTREME  

E-Print Network [OSTI]

DETERMINING OPTICAL CONSTANTS OF URANIUM NITRIDE THIN FILMS IN THE EXTREME ULTRAVIOLET (1.6-35 NM deposition and characterization of reactively-sputtered uranium nitride thin films. I also report optical.1 Application 1 1.2 Optical Constants 2 1.3 Project Focus 7 2 Uranium Nitride Thin Films 8 2.1 Sputtering 8 2

Hart, Gus

132

Extremality of Gaussian quantum states  

E-Print Network [OSTI]

We investigate Gaussian quantum states in view of their exceptional role within the space of all continuous variables states. A general method for deriving extremality results is provided and applied to entanglement measures, secret key distillation and the classical capacity of Bosonic quantum channels. We prove that for every given covariance matrix the distillable secret key rate and the entanglement, if measured appropriately, are minimized by Gaussian states. This result leads to a clearer picture of the validity of frequently made Gaussian approximations. Moreover, it implies that Gaussian encodings are optimal for the transmission of classical information through Bosonic channels, if the capacity is additive.

Michael M. Wolf; Geza Giedke; J. Ignacio Cirac

2005-09-21T23:59:59.000Z

133

Nonparametric Spatial Models for Extremes: Application to Extreme Temperature Data.  

E-Print Network [OSTI]

Nonparametric Spatial Models for Extremes: Application to Extreme Temperature Data. Montserrat-developed, extending these tools to model spatial extreme data is an active area of research. In this paper, in order-developed. However, extending these tools to model spatial extreme data is an active area of research. One

Reich, Brian J.

134

Holographic screens in ultraviolet self-complete quantum gravity  

E-Print Network [OSTI]

In this paper we study the geometry and the thermodynamics of a holographic screen in the framework of the ultraviolet self-complete quantum gravity. To achieve this goal we construct a new static, neutral, non-rotating black hole metric, whose outer (event) horizon coincides with the surface of the screen. The space-time admits an extremal configuration corresponding to the minimal holographic screen and having both mass and radius equalling the Planck units. We identify this object as the space-time fundamental building block, whose interior is physically unaccessible and cannot be probed even during the Hawking evaporation terminal phase. In agreement with the holographic principle, relevant processes take place on the screen surface. The area quantization leads to a discrete mass spectrum. An analysis of the entropy shows that the minimal holographic screen can store only one byte of information while in the thermodynamic limit the area law is corrected by a logarithmic term.

Piero Nicolini; Euro Spallucci

2014-03-04T23:59:59.000Z

135

Extremal covariant measurements  

E-Print Network [OSTI]

We characterize the extremal points of the convex set of quantum measurements that are covariant under a finite-dimensional projective representation of a compact group, with action of the group on the measurement probability space which is generally non-transitive. In this case the POVM density is made of multiple orbits of positive operators, and, in the case of extremal measurements, we provide a bound for the number of orbits and for the rank of POVM elements. Two relevant applications are considered, concerning state discrimination with mutually unbiased bases and the maximization of the mutual information.

G. Chiribella; G. M. D'Ariano

2006-03-20T23:59:59.000Z

136

Extreme Financial cycles$ B. Candelonb,  

E-Print Network [OSTI]

Extreme Financial cycles$ B. Candelonb, , G. Gauliera , C. Hurlinb aUniversity Maastricht proposes a new approach to date extreme financial cycles. Elabo- rating on recent methods in extreme value theory, it elaborates an extension of the famous calculus rule to detect extreme peaks and troughs

Paris-Sud XI, Université de

137

Extremes in Chaotic Dynamical Systems  

E-Print Network [OSTI]

Extremes in Chaotic Dynamical Systems Valerio Lucarini valerio.lucarini@uni-hamburg.de D. Faranda Vortragsthema Datum #12;1. Introduction 2. Classical Theory: Extreme Values for i.i.d. Variables 3. Extreme Values in Dynamical Systems: Theoretical Background 4. Numerical Algorithms for studying Extremes 5

138

de Sitter Extremal Surfaces  

E-Print Network [OSTI]

We study extremal surfaces in de Sitter space in the Poincare slicing in the upper patch, anchored on spatial subregions at the future boundary ${\\cal I}^+$, restricted to constant boundary Euclidean time slices (focussing on strip subregions). We find real extremal surfaces of minimal area as the boundaries of past lightcone wedges of the subregions in question: these are null surfaces with vanishing area. We find also complex extremal surfaces as complex extrema of the area functional, and the area is not always real-valued. In $dS_4$ the area is real and has some structural resemblance with entanglement entropy in a dual $CFT_3$. There are parallels with analytic continuation from the Ryu-Takayanagi expressions for holographic entanglement entropy in $AdS$. We also discuss extremal surfaces in the $dS$ black brane and the de Sitter "bluewall" studied previously. The $dS_4$ black brane complex surfaces exhibit a real finite cutoff-independent extensive piece. In the bluewall geometry, there are real surface...

Narayan, K

2015-01-01T23:59:59.000Z

139

Tetrachloroethylene Degradation by Dithionite with Ultraviolet Activation  

E-Print Network [OSTI]

. This project has conducted research on degrading PCE with an ARP that combines dithionite and ultraviolet activation. The purpose of the project is to provide knowledge for the development of potential wastewater treatment technologies. Several control...

Zhang, Jingyuan

2013-07-30T23:59:59.000Z

140

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...

Lesikar, Bruce J.

2008-10-02T23:59:59.000Z

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

Extreme Cosmic String  

E-Print Network [OSTI]

This paper deals with the geometry of supermassive cosmic strings. We have used an approach that enforces the spacetime of cosmic strings to also satisfy the conservation laws of a cylindric gravitational topological defect, that is a spacetime kink. In the simplest case of kink number unity, the entire energy range of supermassive strings becomes then quantized so that only cylindrical defects with linear energy density $G\\mu=1/4$ (critical string) and $G\\mu=1/2$ (extreme string) are allowed to occur in this range. It has been seen that the internal spherical coordinate $\\theta$ of the string metric embedded in an Euclidean three-space also evolves on imaginary values, leading to the creation of a covering shell of broken phase that protects the core with trapped energy, even for $G\\mu=1/2$. Then the conical singularity becomes a removable horizaon singularity. We re-express the extreme string metric in the Finkelstein- McCollum standard form and remove the geodesic incompleteness by using the Kruskal technique. The z=const. sections of the resulting metric are the same as the hemispherical section of the metric of a De Sitter kink. Some physical consequences from these results, including the possibility that the extreme string drives inflation and thermal effects in its core, are also discussed.

P. F. Gonzalez-Diaz

1995-08-28T23:59:59.000Z

142

Gate-controlled ultraviolet photo-etching of graphene edges  

SciTech Connect (OSTI)

The chemical reactivity of graphene under ultraviolet (UV) light irradiation is investigated under positive and negative gate electric fields. Graphene edges are selectively etched when negative gate voltages are applied while the reactivity is significantly suppressed for positive gate voltages. Oxygen adsorption onto graphene is significantly affected by the Fermi level of the final state achieved during previous electrical measurements. UV irradiation after negative-to-positive gate sweeps causes predominant oxygen desorption while UV irradiation after gate sweeps in the opposite direction causes etching of graphene edges.

Mitoma, Nobuhiko; Nouchi, Ryo [Nanoscience and Nanotechnology Research Center, Osaka Prefecture University, Sakai, Osaka 599-8570 (Japan)] [Nanoscience and Nanotechnology Research Center, Osaka Prefecture University, Sakai, Osaka 599-8570 (Japan)

2013-11-11T23:59:59.000Z

143

Extremal Limits and Kerr Spacetime  

E-Print Network [OSTI]

The fact that one must evaluate the near-extremal and near-horizon limits of Kerr space-time in a specific order, is shown to a lead to discontinuity in the extremal limit, such that this limiting space-time differs nontrivially from the precisely extremal space-time. This is established by first showing a discontinuity in the extremal limit of the maximal analytic extension of the Kerr geometry, given by Carter. Next, we examine the ISCO of the exactly extremal Kerr geometry and show that on the event horizon of the extremal Kerr black hole, it coincides with the principal null geodesic generator of the horizon, having vanishing energy and angular momentum. We find that there is no such ISCO in the near-extremal geometry, thus garnering additional support for our primary contention. We relate this disparity between the two geometries to the lack of a trapping horizon in the extremal situation.

Parthapratim Pradhan; Parthasarathi Majumdar

2011-08-11T23:59:59.000Z

144

Extremal covariant measurements Giulio Chiribellaa  

E-Print Network [OSTI]

Extremal covariant measurements Giulio Chiribellaa and Giacomo Mauro D'Arianob Istituto Nazionale characterize the extremal points of the convex set of quantum measurements that are covariant under a finite operators, and, in the case of extremal measurements, we provide a bound for the number of orbits

D'Ariano, Giacomo Mauro

145

Precipitation extremes under climate change  

E-Print Network [OSTI]

The response of precipitation extremes to climate change is considered using results from theory, modeling, and observations, with a focus on the physical factors that control the response. Observations and simulations with climate models show that precipitation extremes intensify in response to a warming climate. However, the sensitivity of precipitation extremes to warming remains uncertain when convection is important, and it may be higher in the tropics than the extratropics. Several physical contributions govern the response of precipitation extremes. The thermodynamic contribution is robust and well understood, but theoretical understanding of the microphysical and dynamical contributions is still being developed. Orographic precipitation extremes and snowfall extremes respond differently from other precipitation extremes and require particular attention. Outstanding research challenges include the influence of mesoscale convective organization, the dependence on the duration considered, and the need to...

O'Gorman, Paul A

2015-01-01T23:59:59.000Z

146

Ultraviolet Limit of Open String Theory  

E-Print Network [OSTI]

We confirm the intuition that a string theory which is perturbatively infrared finite is automatically perturbatively ultraviolet finite. Our derivation based on the asymptotics of the Selberg trace formula for the Greens function on a Riemann surface holds for both open and closed string amplitudes and is independent of modular invariance and supersymmetry. The mass scale for the open strings stretched between Dbranes suggests a natural world-sheet ultraviolet regulator in the string path integral, preserving both T-duality and open-closed string world-sheet duality. Note added (Jan 2005): Comments and related references added.

Shyamoli Chaudhuri

2005-01-21T23:59:59.000Z

147

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

E-Print Network [OSTI]

Characterization of laser-produced tin plasma. Part I: XUVof laser-produced tin plasma. Part II: Radiation-expanding laser-produced tin plasma,” Eighth International

O'Shay, Joseph Fred

2007-01-01T23:59:59.000Z

148

Extreme-ultraviolet radiation transport in small scale length laser-produced tin plasmas  

E-Print Network [OSTI]

emissions from laser-produced tin plasmas. Proceedings ofRadiation from Laser- Produced Tin Plasmas. Physical Reviewspectra of xenon and tin discharges. Physical Review E,

Sequoia, Kevin Lamar Williams

2009-01-01T23:59:59.000Z

149

CLOSE ASSOCIATION OF AN EXTREME-ULTRAVIOLET SUNSPOT PLUME WITH DEPRESSIONS IN THE SUNSPOT RADIO EMISSION  

E-Print Network [OSTI]

a plume in the sunspot umbra on both observing dates. The plume appears brightest in emission lines formed at temperatures between 1:6 Ã? 105 and 5:0 Ã? 105 K. Radio emission from the sunspot umbra is dominated by thermal gyroemission from the plume, which accounts for radio brightness temperatures umbra on both

White, Stephen

150

Extreme-ultraviolet radiation transport in small scale length laser-produced tin plasmas  

E-Print Network [OSTI]

Plasma diagnostics .spatial profile of the SL355 2.3. Plasma diagnostics In thissection the plasma diagnostics will be explained in detail.

Sequoia, Kevin Lamar Williams

2009-01-01T23:59:59.000Z

151

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

E-Print Network [OSTI]

R. H. Huddlestone, Plasma Diagnostic Techniques (AcademicPlasma Diagnostics beam path and key plasma diagnostics is shown schematically

O'Shay, Joseph Fred

2007-01-01T23:59:59.000Z

152

Extreme ultra-violet emission from coronal loop structures. Technical report  

SciTech Connect (OSTI)

We calculate the XUV line and broad-band emission from a model active-region loop. The spectrum is found to be sensitive to both the coronal heating rate and to the loop geometry.

Tucker, W.H.

1980-07-01T23:59:59.000Z

153

High-Order Harmonic Generation Yielding Tunable Extreme-Ultraviolet Radiation of High Spectral Purity  

E-Print Network [OSTI]

harmonic photon. The universal cutoff in high-order har- monic generation (HHG) processes exists at Ip 3 (ponderomotive) energy of a quasifree electron quivering in the laser field in the neighborhood of the ionic core [9] and for resonance-enhanced wave mixing [10]. In contrast to these studies, in the nonperturbative

154

High-frequency surface acoustic wave propagation in nanaostructures characterized by coherent extreme ultraviolet beams  

E-Print Network [OSTI]

8] R. I. Tobey, M. E. Siemens, O. Cohen, M. M. Murnane, H.32(3):286–288, 2007. [9] M. Siemens, Q. Li, M. Murnane, H.2] R. I. Tobey, M. E. Siemens, M. M. Murnane, H. C. Kapteyn,

Siemens, M.

2009-01-01T23:59:59.000Z

155

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

156

High resolution coherent diffractive imaging with a table-top extreme ultraviolet source  

SciTech Connect (OSTI)

We demonstrate a resolution of 45?nm with a sample size down to 3??m × 3??m is achieved in a short exposure time of 2?s, from the diffraction pattern generated by a table-top high harmonic source at around 30?nm. By using a narrow-bandwidth focusing mirror, the diffraction pattern's quality is improved and the required exposure time is significantly reduced. In order to obtain a high quality of the reconstructed image, the ratio of the beam size to the sample size and the curvature of the focused beam need to be considered in the reconstruction process. This new experimental scheme is very promising for imaging sub-10?nm scale objects with a table-top source based on a small inexpensive femtosecond laser system.

Vu Le, Hoang, E-mail: vuhoangle@swin.edu.au; Ba Dinh, Khuong; Hannaford, Peter; Van Dao, Lap [Centre for Quantum and Optical Science, Swinburne University of Technology, Melbourne 3122 (Australia)

2014-11-07T23:59:59.000Z

157

Sub 400 nm spatial resolution extreme ultraviolet holography with a table top laser  

E-Print Network [OSTI]

. J. E. Trebes, S. B. Brown, E. M. Campbell, D. L. Matthews, D. G. Nilson, G. F. Stone, and D. A Society of America OCIS codes: (090.0090) Holography; (100.2960) Image analysis References and Links 1. D, C. Jacobsen, E. Anderson, M. R. Howells, and D. P. Kern, "High resolution imaging by Fourier

Rocca, Jorge J.

158

Extreme-ultraviolet radiation transport in small scale length laser-produced tin plasmas  

E-Print Network [OSTI]

Physics) by Kevin Lamar Williams Sequoia Committee inR. Tynan Copyright Kevin Lamar Williams Sequoia, 2009 AllDissertation of Kevin Lamar Williams Sequoia is approved,

Sequoia, Kevin Lamar Williams

2009-01-01T23:59:59.000Z

159

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

E-Print Network [OSTI]

to yield a compressed, ultrafast pulse close to the originalspectral width of the ultrafast optical pulses, delivering

Hosler, Erik Robert

2013-01-01T23:59:59.000Z

160

Tabletop coherent diffractive microscopy with extreme ultraviolet light from high harmonic generation  

E-Print Network [OSTI]

magnetic and electric properties of variable sized magnetite nano-hollow spheres J. Appl. Phys. 112, 064318

Miao, Jianwei "John"

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

Combined effects of prepulsing and target geometry on efficient extreme ultraviolet  

E-Print Network [OSTI]

and the deposition of EUV and out of band radiation can fur- ther cause surface erosion and damage at the required targets geometries with special grooves as developed previously by the authors. C 2011 Society of Photo-Optical. Damage of multilayer Mo/Si mirrors by the de- bris products of laser beam interaction with target

Harilal, S. S.

162

Climate Policy: Science, Economics, and Extremes  

E-Print Network [OSTI]

C. Herring, 2013. Explaining extreme events of 2012 from a2010. Fat tails, exponents, extreme uncertainty: SimulatingScience, Economics, and Extremes Anthony C. Fisher and Phu

Fisher, A. C; Le, P. V

2014-01-01T23:59:59.000Z

163

The Extreme Physics Explorer  

E-Print Network [OSTI]

Some tests of fundamental physics - the equation of state at supra-nuclear densities, the metric in strong gravity, the effect of magnetic fields above the quantum critical value - can only be measured using compact astrophysical objects: neutron stars and black holes. The Extreme Physics Explorer is a modest sized (~500 kg) mission that would carry a high resolution (R ~300) X-ray spectrometer and a sensitive X-ray polarimeter, both with high time resolution (~5 ?s) capability, at the focus of a large area (~5 sq.m), low resolution (HPD~1 arcmin) X-ray mirror. This instrumentation would enable new classes of tests of fundamental physics using neutron stars and black holes as cosmic laboratories.

Martin Elvis

2006-08-25T23:59:59.000Z

164

Finding Extreme Subdwarfs  

E-Print Network [OSTI]

I develop a new technique to identify M-type extreme subdwarfs (esdMs) and demonstrate that it is substantially more efficient than previous methods. I begin by obtaining spectroscopy and improved photometry of a sample of 54 late-type halo candidates using the rNLTT reduced proper motion (RPM) diagram. From spectroscopy, I find that four of these are esdMs, three of which were previously unknown. From the improved photometry, I show that all four lie in a narrow RPM corridor that contains only 4 non-esdMs. Hence, with good photometry (i.e., without spectroscopy), it appears possible to select esdM candidates with a 50% esdM yield. This is more than an order of magnitude more efficient than previous methods.

J. L. Marshall

2007-12-06T23:59:59.000Z

165

Extremal vs. Non-Extremal Correlators with Giant Gravitons  

E-Print Network [OSTI]

We consider extremal and non-extremal three-point functions of two giant gravitons and one point-like graviton using Schur polynomials in N=4 super Yang-Mills theory and holographically, using a semiclassical Born-Infeld analysis as well as bubbling geometries. For non-extremal three-point functions our computations using all three approaches are in perfect agreement. For extremal correlators we find that our results from the bubbling geometry analysis agree with existing results from the gauge theory. The semiclassical Born-Infeld computation for the extremal case is known to give a different answer, which we interpret as a manifestation of the known subtlety of holography for extremal correlators.

Pawel Caputa; Robert de Mello Koch; Konstantinos Zoubos

2012-04-18T23:59:59.000Z

166

Detection of magnetic dipole lines of Fe XII in the ultraviolet spectrum of the dwarf star Epsilon Eri  

E-Print Network [OSTI]

We report observations of the dwarf star Epsilon Eri (K2 V) made with the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope (HST). The high sensitivity of the STIS instrument has allowed us to detect the magnetic dipole transitions of Fe XII at 1242.00A and 1349.38A for the first time in a star other than the Sun. The width of the stronger line at 1242.00A has also been measured; such measurements are not possible for the permitted lines of Fe XII in the extreme ultraviolet. To within the accurcy of the measurements, the N V and the Fe XII lines occur at their rest wavelengths. Electron densities and line widths have been measured from other transition region lines. Together, these can be used to investigate the non-thermal energy flux in the lower and upper transition region, which is useful in constraining possible heating processes. The Fe XII lines are also present in archival STIS spectra of other G/K-type dwarfs.

C. Jordan; A. D. McMurry; S. A. Sim; M. Arulvel

2001-01-17T23:59:59.000Z

167

Extreme measures : mechanisms driving changes in climate extremes in Australia.  

E-Print Network [OSTI]

??Changes in the frequency and/or severity of extreme climate events have the potential to have profound societal and ecological impacts and observations suggest that in… (more)

Alexander, Lisa Victoria

2009-01-01T23:59:59.000Z

168

Ultraviolet emissions from Gd3 + ions excited by energy transfer  

E-Print Network [OSTI]

Ultraviolet emissions from Gd3 + ions excited by energy transfer from Ho3 + ions Ying Yu October 2010 Accepted 28 October 2010 Available online 4 November 2010 Keywords: Ultraviolet emission Upconversion Energy transfer a b s t r a c t Ultraviolet (UV) upconversion (UC) emissions of Gd3+ ion were

Cao, Wenwu

169

The Galex Ultraviolet Variability (GUVV) Catalog  

E-Print Network [OSTI]

We present Version 1.0 of the NASA Galaxy Evolution Explorer (GALEX) ultraviolet variability catalog (GUVV) that contains information on 84 time-variable and transient sources gained with simultaneous near and far ultraviolet photometric observations. These time-variable sources were serendipitously revealed in the various 1.2 degree star fields currently being surveyed by the GALEX satellite in two ultraviolet bands (NUV 1750-2750A, FUV 1350-1750A) with limiting AB magnitudes of 23-25. The largest-amplitude variable objects presently detected by GALEX are M-dwarf flare stars, which can brighten by 5-10 mag in both the NUV and FUV bands during short duration (< 500s) outbursts. Other types of large-amplitude ultraviolet variable objects include ab-type RR Lyrae stars, which can vary periodically by 2-5mag in the GALEX FUV band. This first GUVV catalog lists galactic positions and possible source identifications in order to provide the astronomical community with a list of time-variable objects that can now be repeatedly observed at other wavelengths. We expect the total number of time-variable source detections to increase as the GALEX mission progresses, such that later version numbers of the GUVV catalog will contain substantially more variable sources.

Barry Y. Welsh; Jonathan M. Wheatley; Kenneth Heafield; Mark Seibert; Stanley E. Browne; Samir Salim; R. Michael Rich; Tom A. Barlow; Luciana Bianchi; Yong-Ik Byun; Jose Donas; Karl Forster; Peter G. Friedman; Timothy M. Heckman; Patrick N. Jelinsky; Young-Wook Lee; Barry F. Madore; Roger F. Malina; D. Christopher Martin; Bruno Milliard; Patrick Morrissey; Susan G. Neff; David Schiminovich; Oswald H. W. Siegmund; Todd Small; Alex S. Szalay; Ted K. Wyder

2005-04-21T23:59:59.000Z

170

Biomedical devices from ultraviolet February 24, 2012  

E-Print Network [OSTI]

- 1 - Biomedical devices from ultraviolet LEDs February 24, 2012 LEDs produce light, reported in the online Nature Communications, is a step toward biomedical devices with active components on solution-processed inorganic nanocrystals have promise for use in environmental and biomedical diagnostics

171

Extremality conditions for generalized channels  

E-Print Network [OSTI]

A generalized channel is a completely positive map that preserves trace on a given subspace. We find conditions under which a generalized channel with respect to a positively generated subspace J is an extreme point in the set of all such generalized channels. As a special case, this yields extremality conditions for quantum protocols. In particular, we obtain new extremality conditions for quantum 1-testers with 2 outcomes, which correspond to yes/no measurements on the set of quantum channels.

Anna Jencova

2012-04-12T23:59:59.000Z

172

Ultraviolet radiation in the southern seas in early spring 1993  

SciTech Connect (OSTI)

The National Science Foundation research vessel Nathaniel B. Palmer carried out a cruise to Antarctica in early spring of 1993. It left Punta Arenas, Chile, close to the tip of South America on 11 August 1993. sailed south for 3 days to the tip of The Antarctic Peninsula, stopping at O`Higgens and Palmer Stations, and from there went southwest and into the Bellingshausen sea. On 10 September, it reached the most southerly position, 71{degrees}S, some distance north of the Thurston Island. From there, it went as far as 110{degrees}W before returning to Punta Arenas. The main purpose of the cruise was to investigate the snow- and sea-ice thickness, properties, and structures in this part of the southern oceans. It also allowed us to carry out continuous radiation measurements. We measured the following fluxes: global radiation (Eppley PSP), infrared incoming radiation (Eppley Pyrgeometer PIR), ultraviolet-A radiation (Eppley UV meter), ultraviolet-B radiation (Yankee Environmental Systems), and pitch and roll of the ship (Lucas Sensing Systems, Inc.). All instruments were sampled twice per second (Campbell Scientific, Model 21 X), and a notebook computer (ASI Patriot) stored 1-minute averages of the radiation data and 1-minute standard deviation of the ship`s pitch and roll. Visual observations of cloud cover were also recorded. 2 refs., 3 figs.

Wendler, G.; Quakenbush, T. [Univ. of Alaska, Fairbanks, AK (United States)

1994-12-31T23:59:59.000Z

173

Extreme Value Theory and the Solar Cycle  

E-Print Network [OSTI]

We investigate the statistical properties of the extreme events of the solar cycle as measured by the sunspot number. The recent advances in the methodology of the theory of extreme values is applied to the maximal extremes of the time series of sunspots. We focus on the extreme events that exceed a carefully chosen threshold and a generalized Pareto distribution is fitted to the tail of the empirical cumulative distribution. A maximum likelihood method is used to estimate the parameters of the generalized Pareto distribution and confidence levels are also given to the parameters. Due to the lack of an automatic procedure for selecting the threshold, we analyze the sensitivity of the fitted generalized Pareto distribution to the exact value of the threshold. According to the available data, that only spans the previous ~250 years, the cumulative distribution of the time series is bounded, yielding an upper limit of 324 for the sunspot number. We also estimate that the return value for each solar cycle is ~188, while the return value for a century increases to ~228. Finally, the results also indicate that the most probable return time for a large event like the maximum at solar cycle 19 happens once every ~700 years and that the probability of finding such a large event with a frequency smaller than ~50 years is very small. In spite of the essentially extrapolative character of these results, their statistical significance is very large.

A. Asensio Ramos

2007-06-18T23:59:59.000Z

174

On extreme Bosonic linear channels  

E-Print Network [OSTI]

The set of all channels with fixed input and output is convex. We first give a convenient formulation of necessary and sufficient condition for a channel to be extreme point of this set in terms of complementary channel, a notion of big importance in quantum information theory. This formulation is based on the general approach to extremality of completely positive maps in an operator algebra due to Arveson. We then apply this formulation to prove the main result of this note: under certain nondegeneracy conditions, purity of the environment is necessary and sufficient for extremality of Bosonic linear (quasi-free) channel. It follows that Gaussian channel between finite-mode Bosonic systems is extreme if and only if it has minimal noise.

A. S. Holevo

2011-11-15T23:59:59.000Z

175

Extreme field physics and QED  

E-Print Network [OSTI]

We give a brief overview of the most important QED effects that can be studied in the presence of extreme fields such as those expected at the Vulcan laser upgraded to a power of 10 Petawatts.

Thomas Heinzl; Anton Ilderton

2008-09-19T23:59:59.000Z

176

Extreme events in excitable systems and mechanisms of their generation  

E-Print Network [OSTI]

We study deterministic systems, composed of excitable units of FitzHugh-Nagumo type, that are capable of self-generating and self-terminating strong deviations from their regular dynamics without the influence of noise or parameter change. These deviations are rare, short-lasting, and recurrent and can therefore be regarded as extreme events. Employing a range of methods we analyze dynamical properties of the systems, identifying features in the systems' dynamics that may qualify as precursors to extreme events. We investigate these features and elucidate mechanisms that may be responsible for the generation of the extreme events.

Gerrit Ansmann; Rajat Karnatak; Klaus Lehnertz; Ulrike Feudel

2014-08-27T23:59:59.000Z

177

Multivariate Extremes Dependence Comparison Stochastic Tail Order Back to Multivariate Extremes Dependence Comparison of Multivariate  

E-Print Network [OSTI]

Multivariate Extremes Dependence Comparison Stochastic Tail Order Back to Multivariate Extremes Dependence Comparison of Multivariate Extremes Haijun Li Department of Mathematics Washington State University IWAP12, Jerusalem Haijun Li Dependence Comparison of Multivariate Extremes IWAP12, Jerusalem 1

Li, Haijun

178

Extremes are better: investigating mental map preservation in dynamic graphs  

E-Print Network [OSTI]

Purchase,H.C. Samra,A. Proceedings of the 5th International Conference on Diagrammatic Representation and Inference pp 60-73

Purchase, H.C.

179

Northeast Climate Science Center: Transposing Extreme Rainfall...  

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

Center: Transposing Extreme Rainfall to Assess Climate Vulnerability Northeast Climate Science Center: Transposing Extreme Rainfall to Assess Climate Vulnerability November 12,...

180

Ultraviolet Resonant Raman Enhancements in the Detection of Explosives  

SciTech Connect (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

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

Study of extreme nuclear shapes in extreme conditions  

SciTech Connect (OSTI)

Studies of extreme nuclear shapes have always fascinated scientists and are being pursued quite strongly over the years. Nuclei present themselves with interesting shapes and structures at different conditions of spin, excitation and also with the number of neutrons and/or protons in them. Gamma decays from the Giant dipole Resonances in nuclei can probe directly their shapes at different extreme conditions by looking at their resonant line-shapes, e.g., Jacobi shapes and shape-transitions, super/hyper-deformation etc. Similar such studies, done for the first time, using the LAMBDA high energy gamma spectrometer developed at VECC, is discussed here.

Banerjee, Sudhee Ranjan, E-mail: srb@vecc.gov.in [Variable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, Kolkata 700 064 (India)

2014-08-14T23:59:59.000Z

182

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

183

ULTRAVIOLET EXTINCTION AT HIGH GALACTIC LATITUDES  

SciTech Connect (OSTI)

In order to study the properties and effects of high Galactic latitude dust, we present an analysis of 373,303 galaxies selected from the Galaxy Evolution Explorer All-Sky Survey and Wide-field Infrared Explorer All-Sky Data Release. By examining the variation in aggregate ultraviolet colors and number density of these galaxies, we measure the extinction curve at high latitude. We additionally consider a population of spectroscopically selected galaxies from the Sloan Digital Sky Survey to measure extinction in the optical. We find that dust at high latitude is neither quantitatively nor qualitatively consistent with standard reddening laws. Extinction in the FUV and NUV is {approx}10% and {approx}35% higher than expected, with significant variation across the sky. We find that no single R{sub V} parameter fits both the optical and ultraviolet extinction at high latitude, and that while both show detectable variation across the sky, these variations are not related. We propose that the overall trends we detect likely stem from an increase in very small silicate grains in the interstellar medium.

Peek, J. E. G.; Schiminovich, David, E-mail: jegpeek@gmail.com [Department of Astronomy, Columbia University, New York, NY (United States)

2013-07-01T23:59:59.000Z

184

Degradation of Carbon Fiber-reinforced Epoxy Composites by Ultraviolet  

E-Print Network [OSTI]

, combined exposure to UV radiation and water vapor, which are predominantly responsible for degradationDegradation of Carbon Fiber-reinforced Epoxy Composites by Ultraviolet Radiation and Condensation) ABSTRACT: The degradation of an IM7/997 carbon fiber-reinforced epoxy exposed to ultraviolet radiation and

Nakamura, Toshio

185

Femtosecond laser nanomachining initiated by ultraviolet multiphoton ionization  

E-Print Network [OSTI]

Femtosecond laser nanomachining initiated by ultraviolet multiphoton ionization Xiaoming Yu,1) femtosecond laser pulse initiated by an ultraviolet (UV) pulse. With both pulses at a short (~60 fs) delay.g. XUV and X-ray, with the required fluence below their normal threshold. ©2013 Optical Society

Van Stryland, Eric

186

Extreme Conditions Modeling Workshop Report  

SciTech Connect (OSTI)

Sandia National Laboratories (SNL) and the National Renewable Energy Laboratory (NREL) hosted the Wave Energy Converter (WEC) Extreme Conditions Modeling (ECM) Workshop in Albuquerque, NM on May 13th-14th, 2014. The objective of the workshop was to review the current state of knowledge on how to model WECs in extreme conditions (e.g. hurricanes and other large storms) and to suggest how U.S. Department of Energy (DOE) and national laboratory resources could be used to improve ECM methods for the benefit of the wave energy industry.

Coe, R. G.; Neary, V. S.; Lawson, M. J.; Yu, Y.; Weber, J.

2014-07-01T23:59:59.000Z

187

Ultraviolet laser beam monitor using radiation responsive crystals  

DOE Patents [OSTI]

An apparatus and method for monitoring an ultraviolet laser beam includes disposing in the path of an ultraviolet laser beam a substantially transparent crystal that will produce a color pattern in response to ultraviolet radiation. The crystal is exposed to the ultraviolet laser beam and a color pattern is produced within the crystal corresponding to the laser beam intensity distribution therein. The crystal is then exposed to visible light, and the color pattern is observed by means of the visible light to determine the characteristics of the laser beam that passed through crystal. In this manner, a perpendicular cross sectional intensity profile and a longitudinal intensity profile of the ultraviolet laser beam may be determined. The observation of the color pattern may be made with forward or back scattered light and may be made with the naked eye or with optical systems such as microscopes and television cameras.

McCann, Michael P. (Oliver Springs, TN); Chen, Chung H. (Knoxville, TN)

1988-01-01T23:59:59.000Z

188

E-Print Network 3.0 - ambient ultraviolet radiation Sample Search...  

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

radiation. In particular, several members of class amphibia are negatively... affected by exposure to ultraviolet-B radiation. Exposure to ultraviolet-B radiation can cause...

189

E-Print Network 3.0 - artificial ultraviolet radiation Sample...  

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

exposure to ultraviolet radiation, came under suspicion almost as soon... limbs, whereas tad- poles exposed to full doses of natural lev- els of ultraviolet radiation developed......

190

Extremely correlated quantum liquids B. Sriram Shastry  

E-Print Network [OSTI]

Extremely correlated quantum liquids B. Sriram Shastry Physics Department, University of California; published 20 January 2010 Extreme correlations arise as the limit of strong correlations, when the local-J model, embodying such extreme correlations. We formulate the picture of an extremely correlated electron

California at Santa Cruz, University of

191

Statistical Analysis of EXTREMES in GEOPHYSICS  

E-Print Network [OSTI]

Statistical Analysis of EXTREMES in GEOPHYSICS Zwiers FW and Kharin VV. 1998. Changes in the extremes of the climate simulated by CCC GCM2 under CO2 dou- bling. J. Climate 11:2200­2222. http://www.ral.ucar.edu/staff/ericg/readinggroup.html #12;Outline · Some background on Extreme Value Statistics ­ Extremal Types Theorem ­ Max

Gilleland, Eric

192

Extremes and Atmospheric Data Eric Gilleland  

E-Print Network [OSTI]

Extremes and Atmospheric Data Eric Gilleland Research Applications Laboratory National Center for Atmospheric Research 2007-08 Program on Risk Analysis, Extreme Events and Decision Theory, opening workshop 16-19 September, North Carolina #12;Extremes · Interest in making inferences about large, rare, extreme phenomena

Gilleland, Eric

193

KNMI publicatie 221 Extreme klimaatverandering en  

E-Print Network [OSTI]

. Superstormen 16 5.1 Introductie: extreme wind en kustverdediging 16 5.2 Extreme wind en wateropzet in het verleden 17 5.3 Detectie van superstormen 18 5.4 Extreme wind en wateropzet in de toekomst 20 5.5 DiscussieKNMI publicatie 221 · · · · · · · · april 2008 Extreme klimaatverandering en waterveiligheid

Stoffelen, Ad

194

4, 23232360, 2007 Extreme precipitation  

E-Print Network [OSTI]

Close Full Screen / Esc Printer-friendly Version Interactive Discussion EGU Abstract Extreme hydro that are not-commonly used by hydro-meteorology community, i.e., Kolmogorov­Smirnov test, Levene's test for small data sets (e.g., less than 100 points) and small distribution parameter difference (e.g., 50

Boyer, Edmond

195

Extremely high frequency RF effects on electronics.  

SciTech Connect (OSTI)

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

196

The Properties of Ultraviolet-Luminous Galaxies at the Current Epoch  

E-Print Network [OSTI]

We have used the first matched set of GALEX and SDSS data to investigate the properties of a sample of 74 nearby galaxies with far-ultraviolet luminosities chosen to overlap the luminosity range of typical high-z Lyman Break Galaxies (LBGs). GALEX deep surveys have shown that ultraviolet-luminous galaxies (UVLGs) similar to these are the fastest evolving component of the UV galaxy population. Model fits to the combined GALEX and SDSS photometry yield typical FUV extinctions similar to LBGs. The implied star formation rates are SFR ~ 3 to 30 solar mass per year. This overlaps the range of SFRs for LBGs. We find a strong inverse correlation between galaxy mass and far-ultraviolet surface brightness, and on this basis divide the sample into ``large'' and ``compact'' UVLGs. The compact UVLGs have half-light radii of a few kpc or less (similar to LBGs). They are relatively low mass galaxies (~10 billion solar masses) with typical velocity dispersions of 60 to 150 km/s. They span a range in metallicity from 0.3 to 1 times solar, have blue optical-UV colors, and are forming stars at a rate sufficient to build the present galaxy in ~a Gigayear. In all these respects they appear similar to the LBG population. These ``living fossils'' may therefore provide an opportunity for detailed investigation of the physical processes occurring in typical star forming galaxies in the early universe.

Timothy M. Heckman; Charles G. Hoopes; Mark Seibert; Christopher Martin; Samir Salim; R. Michael Rich; Guinevere Kauffmann; Stephane Charlot; Tom A. Barlow; Luciana Bianchi; Yong-Ik Byun; Jose Donas; Karl Forster; Patrick N. Jelinsky; Young-Wook Lee; Barry F. Madore; Roger F. Malina; Bruno Milliard; Patrick F. Morrissey; Susan G. Neff; David Schiminovich; Oswald H. W. Siegmund; Todd Small; Alex S. Szalay; Barry Y. Welsh; Ted K. Wyder

2004-12-21T23:59:59.000Z

197

Extremism  

Office of Scientific and Technical Information (OSTI)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary)morphinan antagonist Journal Article: Crystal structureComposite--FOR IMMEDIATE RELEASEEmissionsi LEFT-WING

198

Extreme Co-movements and Extreme Impacts in High Frequency Data in Finance  

E-Print Network [OSTI]

Extreme Co-movements and Extreme Impacts in High Frequency Data in Finance Zhengjun Zhang, 2006 Abstract Extreme co-movement and extreme impact problems are inherently stochastic control in the future. Extreme co-movements among financial assets have been reported in the literature. However

Zhang, Zhengjun

199

Extremal limits and black hole entropy  

E-Print Network [OSTI]

Taking the extremal limit of a non-extremal Reissner-Nordstr\\"om black hole (by externally varying the mass or charge), the region between the inner and outer event horizons experiences an interesting fate -- while this region is absent in the extremal case, it does not disappear in the extremal limit but rather approaches a patch of $AdS_2\\times S^2$. In other words, the approach to extremality is not continuous, as the non-extremal Reissner-Nordstr\\"om solution splits into two spacetimes at extremality: an extremal black hole and a disconnected $AdS$ space. We suggest that the unusual nature of this limit may help in understanding the entropy of extremal black holes.

Sean M. Carroll; Matthew C. Johnson; Lisa Randall

2009-01-08T23:59:59.000Z

200

ARM - Measurement - Extreme event time  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsruc Documentation RUC : XDCResearch Related InformationAciddroplet size ARMgovMeasurementsExtreme

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

ATMOSPHERIC AND OCEANIC SCIENCE LETTERS, 2013, VOL. 6, NO. 5, 312319 Changes in Daily Climate Extremes of Observed Temperature and  

E-Print Network [OSTI]

Extremes of Observed Temperature and Precipitation in China WANG Ai-Hui and FU Jian-Jian Nansen precipitation for 1960­2011 and maxi- mum/minimum temperature extremes for 1960­2008 re- corded at 549 stations in China are utilized to investigate climate extreme variations. A set of indices is derived and analyzed

202

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

203

Subcutaneous and cutaneous melanins in Rhabdomys: complementary ultraviolet radiation shields  

E-Print Network [OSTI]

We describe the pigmented tissue layer covering the skull of Rhabdomys pumilio and test the hypotheses that it is melanin and that it functions in absorption of ultraviolet solar radiation. The parietals were covered by a dark tissue layer...

Timm, Robert M.; Kermott, L. Henry

1982-02-01T23:59:59.000Z

204

Extreme inequalities for infinite group problems  

E-Print Network [OSTI]

Apr 3, 2006 ... In this paper we derive new properties of extreme inequalities for infinite group ... (f,f(r)) is called extreme if it cannot be written as a convex ...

2006-04-03T23:59:59.000Z

205

Ultraviolet extrapolations in finite oscillator bases  

E-Print Network [OSTI]

The use of finite harmonic oscillator spaces in many-body calculations introduces both infrared (IR) and ultraviolet (UV) errors. The IR effects are well approximated by imposing a hard-wall boundary condition at a properly identified radius L_eff. We show that duality of the oscillator implies that the UV effects are equally well described by imposing a sharp momentum cutoff at a momentum Lambda_eff complementary to L_eff. By considering two-body systems with separable potentials, we show that the UV energy corrections depend on details of the potential, in contrast to the IR energy corrections, which depend only on the S-matrix. An adaptation of the separable treatment to more general interactions is developed and applied to model potentials as well as to the deuteron with realistic potentials. The previous success with a simple phenomenological form for the UV error is also explained. Possibilities for controlled extrapolations for A > 2 based on scaling arguments are discussed.

S. König; S. K. Bogner; R. J. Furnstahl; S. N. More; T. Papenbrock

2014-12-29T23:59:59.000Z

206

Vacuum ultraviolet photoionization of carbohydrates and nucleotides  

SciTech Connect (OSTI)

Carbohydrates (2-deoxyribose, ribose, and xylose) and nucleotides (adenosine-, cytidine-, guanosine-, and uridine-5{sup ?}-monophosphate) are generated in the gas phase, and ionized with vacuum ultraviolet photons (VUV, 118.2 nm). The observed time of flight mass spectra of the carbohydrate fragmentation are similar to those observed [J.-W. Shin, F. Dong, M. Grisham, J. J. Rocca, and E. R. Bernstein, Chem. Phys. Lett. 506, 161 (2011)] for 46.9 nm photon ionization, but with more intensity in higher mass fragment ions. The tendency of carbohydrate ions to fragment extensively following ionization seemingly suggests that nucleic acids might undergo radiation damage as a result of carbohydrate, rather than nucleobase fragmentation. VUV photoionization of nucleotides (monophosphate-carbohydrate-nucleobase), however, shows that the carbohydrate-nucleobase bond is the primary fragmentation site for these species. Density functional theory (DFT) calculations indicate that the removed carbohydrate electrons by the 118.2 nm photons are associated with endocyclic C–C and C–O ring centered orbitals: loss of electron density in the ring bonds of the nascent ion can thus account for the observed fragmentation patterns following carbohydrate ionization. DFT calculations also indicate that electrons removed from nucleotides under these same conditions are associated with orbitals involved with the nucleobase-saccharide linkage electron density. The calculations give a general mechanism and explanation of the experimental results.

Shin, Joong-Won, E-mail: jshin@govst.edu [Division of Science, Governors State University, University Park, Illinois 60484-0975 (United States) [Division of Science, Governors State University, University Park, Illinois 60484-0975 (United States); Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872 (United States); Bernstein, Elliot R., E-mail: erb@lamar.colostate.edu [Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872 (United States)

2014-01-28T23:59:59.000Z

207

Lamp for generating high power ultraviolet radiation  

DOE Patents [OSTI]

The apparatus is a gas filled ultraviolet generating lamp for use as a liquid purifier. The lamp is powred by high voltage AC, but has no metallic electrodes within or in contact with the gas enclosure which is constructed as two concentric quartz cylinders sealed together at their ends with the gas fill between the cylinders. Cooling liquid is pumped through the volume inside the inner quartz cylinder where an electrically conductive pipe spaced from the inner cylinder is used to supply the cooling liquid and act as the high voltage electrode. The gas enclosure is enclosed within but spaced from a metal housing which is connected to operate as the ground electrode of the circuit and through which the treated fluid flows. Thus, the electrical circuit is from the central pipe, and through the cooling liquid, the gas enclosure, the treated liquid on the outside of the outer quartz cylinder, and to the housing. The high voltage electrode is electrically isolated from the source of cooling liquid by a length of insulated hose which also supplies the cooling liquid.

Morgan, Gary L. (Elkridge, MD); Potter, James M. (Los Alamos, NM)

2001-01-01T23:59:59.000Z

208

Extreme phase and rotated quadrature measurements  

E-Print Network [OSTI]

We determine the extreme points of the convex set of covariant phase observables. Such extremals describe the best phase parameter measurements of laser light - the best in the sense that they are free from classical randomness due to fluctuations in the measuring procedure. We also characterize extreme fuzzy rotated quadratures.

Juha-Pekka Pellonpää

2009-11-03T23:59:59.000Z

209

Extreme Events Met Data and Modeling  

E-Print Network [OSTI]

Extreme Events Met Data and Modeling: Needs and Challenges Data Collection and Analysis Modeling and Calibration Design, Construction, O&M Bruce Williams, University of Delaware Tuesday, July 2, 2013 #12;Extreme and marine operations ­ Fatigue and increased maintenance Tuesday, July 2, 2013 #12;What Defines "Extreme

Firestone, Jeremy

210

Extremal Problems on Posets and Hypergraphs  

E-Print Network [OSTI]

Extremal Problems on Posets and Hypergraphs Linyuan Lu University of South Carolina Collaborators, June 16-19, 2014 #12;Overview Extremal problems on posets and hypergraphs Linyuan Lu, University of South Carolina ­ 2 / 32 Extremal problems on subsets (posets) Tur´an problems on (non

Griggs, Jerrold R.

211

Extremely Correlated Fermi Liquids B. Sriram Shastry  

E-Print Network [OSTI]

Extremely Correlated Fermi Liquids B. Sriram Shastry Physics Department, University of California the theory of an extremely correlated Fermi liquid with U ! 1. This liquid has an underlying auxiliary Fermi liquid Green's function that is further caparisoned by extreme correlations. The theory leads to two

California at Santa Cruz, University of

212

Extreme Web Data Integration August 14, 2010  

E-Print Network [OSTI]

Extreme Web Data Integration August 14, 2010 Felix Naumann #12;Acknowledgements @IBM Almaden) Open Data community Felix Naumann | Extreme Web Data Integration | NFIC 2010 2 #12;Overview Felix Naumann | Extreme Web Data Integration | NFIC 2010 3 Web Data abounds ­ linked, open, and otherwise Web

Weske, Mathias

213

Presented by Climate Extremes: The Science,  

E-Print Network [OSTI]

Presented by Climate Extremes: The Science, Impacts, and Policy Relevance Auroop R. Ganguly-Battelle for the U.S. Department of Energy Ganguly_ClimateExtremes_SC10 Global warming is credible: Without-Battelle for the U.S. Department of Energy Ganguly_ClimateExtremes_SC10 Knowledge gaps exist in the science

214

Alice: The Rosetta Ultraviolet Imaging Spectrograph  

E-Print Network [OSTI]

We describe the design, performance and scientific objectives of the NASA-funded ALICE instrument aboard the ESA Rosetta asteroid flyby/comet rendezvous mission. ALICE is a lightweight, low-power, and low-cost imaging spectrograph optimized for cometary far-ultraviolet (FUV) spectroscopy. It will be the first UV spectrograph to study a comet at close range. It is designed to obtain spatially-resolved spectra of Rosetta mission targets in the 700-2050 A spectral band with a spectral resolution between 8 A and 12 A for extended sources that fill its ~0.05 deg x 6.0 deg field-of-view. ALICE employs an off-axis telescope feeding a 0.15-m normal incidence Rowland circle spectrograph with a concave holographic reflection grating. The imaging microchannel plate detector utilizes dual solar-blind opaque photocathodes (KBr and CsI) and employs a 2 D delay-line readout array. The instrument is controlled by an internal microprocessor. During the prime Rosetta mission, ALICE will characterize comet 67P/Churyumov-Gerasimenko's coma, its nucleus, and the nucleus/coma coupling; during cruise to the comet, ALICE will make observations of the mission's two asteroid flyby targets and of Mars, its moons, and of Earth's moon. ALICE has already successfully completed the in-flight commissioning phase and is operating normally in flight. It has been characterized in flight with stellar flux calibrations, observations of the Moon during the first Earth fly-by, and observations of comet Linear T7 in 2004 and comet 9P/Tempel 1 during the 2005 Deep Impact comet-collision observing campaign

S. A. Stern; D. C. Slater; J. Scherrer; J. Stone; M. Versteeg; M. F. A'Hearn; J. L. Bertaux; P. D. Feldman; M. C. Festou; J. Wm. Parker; O. H. W. Siegmund

2006-03-21T23:59:59.000Z

215

Direct writing of ferroelectric domains on strontium barium niobate crystals using focused ultraviolet laser light  

SciTech Connect (OSTI)

We report ferroelectric domain inversion in strontium barium niobate (SBN) single crystals by irradiating the surface locally with a strongly focused ultraviolet (UV) laser beam. The generated domains are investigated using piezoresponse force microscopy. We propose a simple model that allows predicting the domain width as a function of the irradiation intensity, which indeed applies for both SBN and LiNbO{sub 3}. Evidently, though fundamentally different, the domain structure of both SBN and LiNbO{sub 3} can be engineered through similar UV irradiation.

Boes, Andreas; Crasto, Tristan; Steigerwald, Hendrik; Mitchell, Arnan [School of Electrical and Computer Engineering and ARC Center for Ultra-High Bandwidth Devices for Optical Systems (CUDOS), RMIT University, Melbourne, Victoria 3001 (Australia)] [School of Electrical and Computer Engineering and ARC Center for Ultra-High Bandwidth Devices for Optical Systems (CUDOS), RMIT University, Melbourne, Victoria 3001 (Australia); Wade, Scott [Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, Hawthorn, Victoria 3122 (Australia)] [Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, Hawthorn, Victoria 3122 (Australia); Frohnhaus, Jakob; Soergel, Elisabeth [Institute of Physics, University of Bonn, Wegelerstr. 8, 53115 Bonn (Germany)] [Institute of Physics, University of Bonn, Wegelerstr. 8, 53115 Bonn (Germany)

2013-09-30T23:59:59.000Z

216

Extreme hydro-meteorological events and their probabilities  

E-Print Network [OSTI]

Extreme hydro-meteorological events and their probabilities Jules Beersma #12;Promotor: Prof. dr. A Onderzoekschool (BBOS) #12;Extreme hydro-meteorological events and their probabilities Extreme hydro

Beersma, Jules

217

Medical Sequencing at the extremes of Human Body Mass  

E-Print Network [OSTI]

Medical Sequencing at the Extremes of Human Body Mass Nadavcandidate genes and the extremes of human body mass.especially in the population extremes of a given phenotype

2006-01-01T23:59:59.000Z

218

Changes in concurrent monthly precipitation and temperature extremes  

E-Print Network [OSTI]

changes in daily climate extremes of temperature J. Geophys.Bayesian spatial modeling of extreme precipitation returnand Mearns L 2000 Climate extremes: observations, modeling,

Hao, Zengchao; AghaKouchak, Amir; Phillips, Thomas J

2013-01-01T23:59:59.000Z

219

Effects of Seasonality on the Estimation of Environmental Extremes: A Study of Non-Homogeneous Methods for Estimating Environmental Extremes:.  

E-Print Network [OSTI]

??Extreme value theory is commonly applied in ocean engineering to estimate extreme environmental conditions (e.g. wave height and wind speed). Extreme value models generally assume… (more)

Trahan, A.C.

2013-01-01T23:59:59.000Z

220

ARE CORONAE OF MAGNETICALLY ACTIVE STARS HEATED BY FLARES? II. EXTREME ULTRAVIOLET AND X-RAY FLARE STATISTICS AND THE  

E-Print Network [OSTI]

@astro.columbia.edu Vinay L. Kashyap and Jeremy J. Drake Harvard-Smithsonian Center for Astrophysics, 60 Garden Street distribution in radiated energy of the late-type active star AD Leo. Occurrence rates of solar flares have almost 2 orders of magnitude in their radiated energy. We compare the observed light curves with light

Audard, Marc

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

Lasing of extreme ultraviolet light with nitrogen plasma in a recombining phase-Roles of doubly excited states  

SciTech Connect (OSTI)

Focused are the properties of population inversion with nitrogen plasma between n = 3 and 2 of a hydrogen-like state in a recombining phase. The population inversion is calculated in the framework of population kinetics, and the gain coefficient G is estimated. The maximum plasma length L is approximated by a product of the duration of population inversion {tau}{sub e} and the speed of light c. In the calculation, dielectronic-capture ladderlike (DL) processes are considered. At the plasma ion densities of 10{sup 17-18} cm{sup -3} with a rapid cooling, the DL deexcitations make a large contribution to the population inversion, resulting in GL=5-10, and the prescription of plasma cooling is found to be definitely critical.

Ozawa, Takuya; Yamamura, Shuhei; Tatsumura, Nao; Horioka, Kazuhiko; Kawamura, Tohru [Department of Energy Sciences, Tokyo Institute of Technology, Nagatsuta 4259, Midori, Yokohama, Kanagawa (Japan)

2012-06-15T23:59:59.000Z

222

Extreme-ultraviolet spectral purity and magnetic ion debris mitigation by use of low-density tin targets  

E-Print Network [OSTI]

The UTA obtained from full density tin and 0.5% Sn density.The UTA spectrum from tin doped foam targets showed distincta) and 0.5 % density (b) tin in the presence and absence of

Harilal, S S; Tillack, Mark S; O'Shay, Beau; Tao, Y; Paguio, R; Nikroo, A

2006-01-01T23:59:59.000Z

223

Atmosphere of a sunspot based on observations in the x-ray, extreme ultraviolet, optical, and radio ranges  

SciTech Connect (OSTI)

It is shown that the lower chromosphere of an umbra is best described within the framework of a model close to that of Teplitskaya et al. This model can be extended to higher levels using a large temperature gradient, so that Troughly-equal40 000 K and an electron density n/sub e/roughly-equal4x10/sup 10/ cm/sup -3/ are reached at a height zroughly-equal2000 km above the umbral photosphere. These values are defined by the EUV data of the HRTS instrument. At higher levels one must presume the existence of at least two components: The hot component, which occupies ..cap alpha..roughly-equal0.8--0.9 of the total volume, has a narrow transition layer, and the coronal values of Troughly-equal1.8x10/sup 6/ K and n/sub e/roughly-equal5x10/sup 8/ even at a height z = 3000--5000 km. These values are consistent both with the absence of an x-ray emission flux above large sunspots and with the high brightness temperature T/sub b/ = 1.8x10/sup 6/ K of emission in the centimeter range from the same region. This hot coronal matter surrounds the bases of cool loops emerging from the umbra in the form of bundles, and they emit the EUV lines observed at 10/sup 4/< or =T< or =10/sup 6/ K. In the corona the z dependence of all the physical quantities, including ..cap alpha.., over a distance of several thousand kilometers can be taken as weak. Along the axis of a loop T grows slowly, the loops become more horizontal, and at distances and heights of several tens of thousands of kilometers above a flocculus they appear as hot x-ray loops.

Staude, J.; Fuerstenberg, F.; Hildebrandt, J.; Krueger, A.; Jakimiec, J.; Obridko, V.N.; Siarkowski, M.; Sylwester, B.; Sylwester, J.

1984-09-01T23:59:59.000Z

224

January 1983 / Vol. 8, No. 1 / OPTICS LETTERS 21 Dichroic beam splitter for extreme-ultraviolet and visible  

E-Print Network [OSTI]

and UV laser beamsis demonstrated. The devicehas high XUV reflection efficiency(R - 44%)and highdam- age the generatedharmonic inthe XUV. This intense fundamental beam can destroy a sample or saturate detectors of absorbing largeenergy fluxes from pulsed lasers used to generate the XLUV radiation. A typical damage limit

Bokor, Jeffrey

225

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

SciTech Connect (OSTI)

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

226

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

E-Print Network [OSTI]

Dispersion . . . . . . . . . . . . . 2.2.3 Optics for Pulse4.3.2 Optic Development . . . . . . . . .of EUV Multilayer Optics . . . . . 3.1.1 The Necessity of

Aquila, Andrew Lee

2009-01-01T23:59:59.000Z

227

High-resolution tangential absolute extreme ultraviolet arrays for radiated power density measurements on NSTX-U  

SciTech Connect (OSTI)

The radiated-power-density diagnostic on the equatorial midplane for the NSTX-U tokamak will be upgraded to measure the radial structure of the photon emissivity profile with an improved radial resolution. This diagnostic will enhance the characterization and studies of power balance, impurity transport, and MHD. The layout and response expected of the new system is shown for different plasma conditions and impurity concentrations. The effect of toroidal rotation driving poloidal asymmetries in the core radiation from high-Z impurities is also addressed.

Delgado-Aparicio, L.; Bell, R. E.; Diallo, A.; Gerhardt, S. P.; Kozub, T. A.; LeBlanc, B. P.; Stratton, B. C. [Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540 (United States); Faust, I. [MIT Plasma Science and Fusion Center, Cambridge, Massachusetts 02139 (United States); Tritz, K. [The Johns Hopkins University, Baltimore, Maryland 21209 (United States)

2014-11-15T23:59:59.000Z

228

Spectroscopic investigations of the vibrational potential energy surfaces in electronic ground and excited states  

E-Print Network [OSTI]

The vibrational potential energy surfaces in electronic ground and excited states of several ring molecules were investigated using several different spectroscopic methods, including far-infrared (IR), Raman, ultraviolet (UV) absorption...

Yang, Juan

2007-09-17T23:59:59.000Z

229

Intensification of precipitation extremes with warming in a cloud resolving model  

E-Print Network [OSTI]

A cloud-resolving model is used to investigate the effect of warming on high percentiles of precipitation (precipitation extremes) in the idealized setting of radiative-convective equilibrium. While this idealized setting ...

Muller, Caroline

230

Southern hemisphere regional precipitation and climate variability : extremes trends and predictability.  

E-Print Network [OSTI]

??This PhD thesis investigates the relative importance of oceanic and atmospheric influences on extremes, long-term trends, and seasonal to interannual variability of precipitation for different… (more)

Ummenhofer, Caroline C

2008-01-01T23:59:59.000Z

231

STUDYING LARGE- AND SMALL-SCALE ENVIRONMENTS OF ULTRAVIOLET LUMINOUS GALAXIES  

SciTech Connect (OSTI)

Studying the environments of 0.4 < z < 1.2 ultraviolet (UV)-selected galaxies, as examples of extreme star-forming galaxies (with star formation rates (SFRs) in the range of 3-30 M{sub sun} yr{sup -1}), we explore the relationship between high rates of star formation, host halo mass, and pair fractions. We study the large- and small-scale environments of local ultraviolet luminous galaxies (UVLGs) by measuring angular correlation functions. We cross-correlate these systems with other galaxy samples: a volume-limited sample (ALL), a blue luminous galaxy sample, and a luminous red galaxy (LRG) sample. We determine the UVLG comoving correlation length to be r{sub 0} = 4.8{sup +11.6}{sub -2.4} h {sup -1} Mpc at (z) = 1.0, which is unable to constrain the halo mass for this sample. However, we find that UVLGs form close (separation <30 kpc) pairs with the ALL sample, but do not frequently form pairs with LRGs. A rare subset of UVLGs, those with the highest FUV surface brightnesses, are believed to be local analogs of high-redshift Lyman break galaxies (LBGs) and are called Lyman break analogs (LBAs). LBGs and LBAs share similar characteristics (i.e., color, size, surface brightness, specific SFRs, metallicities, and dust content). Recent Hubble Space Telescope images of z {approx} 0.2 LBAs show disturbed morphologies, signs of mergers and interactions. UVLGs may be influenced by interactions with other galaxies and we discuss this result in terms of other high star-forming, merging systems.

Basu-Zych, Antara R.; Schiminovich, David [Department of Astronomy, Columbia University, 550 West 120th Street, New York, NY 10027 (United States); Heinis, Sebastien; Heckman, Tim; Bianchi, Luciana [Center for Astrophysical Sciences, The Johns Hopkins' University, 3400 N. Charles St., Baltimore, MD 21218 (United States); Overzier, Roderik [Max-Planck-Institut fuer Astrophysik, D-85748 Garching (Germany); Zamojski, Michel; Barlow, Tom A.; Conrow, Tim; Forster, Karl G.; Friedman, Peter G.; Martin, D. Christopher; Morrissey, Patrick [California Institute of Technology, MC 405-47, 1200 East California Boulevard, Pasadena, CA 91125 (United States); Ilbert, Olivier [Institute for Astronomy, 2680 Woodlawn Dr., University of Hawaii, Honolulu, HI 96822 (United States); Koekemoer, Anton M. [Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States); Donas, Jose; Milliard, Bruno [Laboratoire d'Astrophysique de Marseille, BP8, Traverse du Siphon, F-13376 Marseille (France); Lee, Young-Wook [Center for Space Astrophysics, Yonsei University, Seoul 120-749 (Korea, Republic of); Madore, Barry F. [Observatories of the Carnegie Institution of Washington, 813 Santa Barbara St., Pasadena, CA 91101 (United States); Neff, Susan G. [Laboratory for Astronomy and Solar Physics, NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)], E-mail: antara@astro.columbia.edu (and others)

2009-07-10T23:59:59.000Z

232

Extreme Scale Computing, Co-design  

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

the Exascale Co-design Center for Materials in Extreme Conditions. * Collaborating with EMC Corporation to support the Department of Energy's Exascale Initiative, which is aimed...

233

Extreme Scale Computing, Co-design  

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

the Exascale Co-design Center for Materials in Extreme Conditions. Collaborating with EMC Corporation to support the Department of Energy's Exascale Initiative, which is aimed...

234

Extremely Hazardous Substances Risk Management Act (Delaware)  

Broader source: Energy.gov [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:

235

E-Print Network 3.0 - accurate laboratory ultraviolet Sample...  

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

are recorded in the visible and near ultra-violet spectral regions so... the ultra-violet radiation balance. The work reportedhere was designed to measure the cross... performed...

236

E-Print Network 3.0 - all-solid-state ultraviolet laser Sample...  

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

ultraviolet laser Search Powered by Explorit Topic List Advanced Search Sample search results for: all-solid-state ultraviolet laser Page: << < 1 2 3 4 5 > >> 1 All-solid-state...

237

Inhibition of Photosynthesis in Some Algae by Extreme-Red Light Author(s): Eugene Rabinowitch, Govindjee, Jan B. Thomas  

E-Print Network [OSTI]

Inhibition of Photosynthesis in Some Algae by Extreme-Red Light Author(s): Eugene Rabinowitch://www.jstor.org #12;Inhibition of Photosynthesis in Some Algae by Extreme"Red Light Abstract. Photosynthesis produced by far-red light (about 700 m,b) is reversibly inhibited in some algae by extreme-red light ( 750 m

Govindjee

238

Complex Plasma Research Under Extreme Conditions  

SciTech Connect (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

239

Ris R 1068EN Extreme Winds  

E-Print Network [OSTI]

Ris R 1068EN Extreme Winds in Denmark Leif Kristensen and Ole Rathmann Ris National Laboratory of this investigationis to study, on basis of climatologicalrecords, how large extreme wind speeds are in various parts;Abstract Wind-speed data from four sites in Denmark have been analyzed in order to obtain estimates

240

APPROXIMATE PERFORMANCE ANALYSIS OF WIRELESS ULTRAVIOLET LINKS Zhengyuan Xu  

E-Print Network [OSTI]

, the solar radiation observed outside the atmosphere shows a wavelength- dependent energy distribution due. INDEX TERMS Ultraviolet, line of sight, non-line of sight, link budget, solar blind. 1. INTRODUCTION advantages [8], such as huge unli- censed bandwidth, low-power and miniaturized transceiver, higher power

Xu, Zhengyuan "Daniel"

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

Electron and proton aurora observed spectroscopically in the far ultraviolet  

E-Print Network [OSTI]

Electron and proton aurora observed spectroscopically in the far ultraviolet M. Galand,1 D the location of the electron and proton aurorae is discussed. The estimation of the particle characteristics aurora. Because protons and electrons do not interact in the same way with the atmosphere, our study

Lummerzheim, Dirk

242

Time resolved ultraviolet absorption spectroscopy of pulsed fluorocarbon plasmas  

E-Print Network [OSTI]

Time resolved ultraviolet absorption spectroscopy of pulsed fluorocarbon plasmas Brett A. Cruden.1063/1.1334936 I. INTRODUCTION The study of fluorocarbon plasmas is of great interest for their applications in silicon dioxide etching.1,2 Recently, at- tention has been paid to using fluorocarbon plasmas to pro- duce

Gleason, Karen K.

243

Achieving Extreme Efficiency: How to get the job done when energy is extremely  

E-Print Network [OSTI]

LBNL-5601E Achieving Extreme Efficiency: How to get the job done when energy is extremely expensive the job done when energy is extremely expensive and scarce Rich Brown, Louis-Benoit Desroches, Karina and scarce Rich Brown, Louis-Benoit Desroches, Karina Garbesi and Alan Meier Environmental Energy

244

Spatially Penalized Regression for Extremes Dependence Analysis and Prediction: Case of Precipitation Extremes  

E-Print Network [OSTI]

Spatially Penalized Regression for Extremes Dependence Analysis and Prediction: Case of Precipitation Extremes Debasish Das1,2 , Auroop R. Ganguly1 , Snigdhansu Chatterjee3 , Vipin Kumar4 , Zoran@cs.umn.edu, zoran.obradovic@temple.edu. ABSTRACT The inability to predict precipitation extremes under non

Obradovic, Zoran

245

Could the Earth's surface Ultraviolet irradiance be blamed for the global warming? A new effect may exist  

E-Print Network [OSTI]

Whether natural factors could interpret the rise of the Earth's surface temperature is still controversial. Though numerous recent researches have reported apparent correlations between solar activity and the Earth's climate, solar activity has encountered a big problem when describing the rapid global warming after 1970s. Our investigation shows the good positive correlations between the Earth's surface Ultraviolet irradiance (280-400 nm) and the Earth's surface temperature both in temporal and spatial variations by analyzing the global surface Ultraviolet irradiance (280-400 nm) and global surface temperature data from 1980-1999. The rise of CO$_2$ cannot interpret the good positive correlations, and we could even get an opposite result to the good correlations when employing the rise of CO$_2$ to describe the relation between them. Based on the good positive correlations, we suggest a new effect, named "Highly Excited Water Vapor" (HEWV) effect, which can interpret how the Sun influences the Earth's surfac...

Chen, Jilong; Zhao, Juan; Zheng, Yujun

2014-01-01T23:59:59.000Z

246

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...

Ryu, Yong Uk

2009-06-02T23:59:59.000Z

247

Remote measurement of sulfur dioxide emissions using an ultraviolet light sensitive video system  

SciTech Connect (OSTI)

Remote measurements of SO/sub 2/ emissions and plume velocities were made with a portable ultraviolet light-sensitive video system and compared with EPA in-stack compliance measurement methods. The instrument system measures the ultraviolet light absorption of SO/sub 2/ and movement of SO/sub 2/ fluctuations in the effluent plume and relates these measurements to the SO/sub 2/ concentration and velocity of the plume. Laboratory and field tests were conducted to establish the potential for using this technique for rapid surveillance of SO/sub 2/ emissions. The effects caused by submicron aerosols also were investigated. The field tests were performed on two occasions. On the first occasion, SO/sub 2/ and plume velocity measurements were made at a typical coal-fired power plant with flue gas desulfurization (FGD) controls (concentrations ranged from 80 to 365 ppm). The second occasion involved participation in an urban particulate modeling study, which resulted in routine SO/sub 2/ emission measurements performed at 12 industrial sites. The results of smoke generator and field tests indicate that the sulfur dioxide concentration of smoke stack emissions can be made with an accuracy less than +/-120 ppm (relative to the EPA stack test compliance method), provided the particulate opacity of the emissions is less than 22 percent. The velocity measurement feature of the instrument correlated poorly with the EPA compliance method for stack gas velocity.

McElhoe, H.B.; Conner, W.D.

1986-01-01T23:59:59.000Z

248

Vacuum-Ultraviolet (VUV) Photoionization of Small Methanol and Methanol-Water Clusters  

SciTech Connect (OSTI)

In this work, we report on the vacuum-ultraviolet (VUV) photoionization of small methanol and methanol-water clusters. Clusters of methanol with water are generated via co-expansion of the gas phase constituents in a continuous supersonic jet expansion of methanol and water seeded in Ar. The resulting clusters are investigated by single photon ionization with tunable vacuum-ultraviolet synchrotron radiation and mass analyzed using reflectron mass spectrometry. Protonated methanol clusters of the form (CH3OH)nH+(n = 1-12) dominate the mass spectrum below the ionization energy of the methanol monomer. With an increase in water concentration, small amounts of mixed clusters of the form (CH3OH n(H2O)H+ (n = 2-11) are detected. The only unprotonated species observed in this work are the methanol monomer and dimer. Appearance energies are obtained from the photoionization efficiency (PIE) curves for CH3OH+, (CH3OH)2+, (CH3OH)nH+ (n = 1-9), and (CH3OH)n(H2O)H+ (n = 2-9) as a function of photon energy. With an increasein the water content in the molecular beam, there is an enhancement of photoionization intensity for the methanol dimer and protonated methanol monomer at threshold. These results are compared and contrasted to previous experimental observations.

Kostko, Oleg; Belau, Leonid; Wilson, Kevin R.; Ahmed, Musahid

2008-04-24T23:59:59.000Z

249

Transiting the Sun: The impact of stellar activity on X-ray and ultraviolet transits  

E-Print Network [OSTI]

Transits of hot Jupiters in X-rays and the ultraviolet have been shown to be both deeper and more variable than the corresponding optical transits. This variability has been attributed to hot Jupiters having extended atmospheres at these wavelengths. Using resolved images of the Sun from NASA's Solar Dynamics Observatory spanning 3.5 years of Solar Cycle 24 we simulate transit light curves of a hot Jupiter to investigate the impact of Solar like activity on our ability to reliably recover properties of the planet's atmosphere in soft X-rays (94 {\\AA}), the UV (131-1700 {\\AA}), and the optical (4500 {\\AA}). We find that for stars with similar activity levels to the Sun, the impact of stellar activity results in the derived radius of the planet in soft X-ray/EUV to be underestimated by up-to 25% or overestimated by up-to 50% depending on whether the planet occults active regions. We also find that in up-to 70% of the X-ray light curves the planet transits over bright star spots. In the far ultraviolet (1600 &am...

Llama, J

2015-01-01T23:59:59.000Z

250

Extreme Bowen-York initial data  

E-Print Network [OSTI]

The Bowen-York family of spinning black hole initial data depends essentially on one, positive, free parameter. The extreme limit corresponds to making this parameter equal to zero. This choice represents a singular limit for the constraint equations. We prove that in this limit a new solution of the constraint equations is obtained. These initial data have similar properties to the extreme Kerr and Reissner-Nordstrom black hole initial data. In particular, in this limit one of the asymptotic ends changes from asymptotically flat to cylindrical. The existence proof is constructive, we actually show that a sequence of Bowen-York data converges to the extreme solution.

Sergio Dain; María E. Gabach Clément

2008-06-13T23:59:59.000Z

251

Route to extreme events in excitable systems  

E-Print Network [OSTI]

Systems of FitzHugh-Nagumo units with different coupling topologies are capable of self-generating and -terminating strong deviations from their regular dynamics that can be regarded as extreme events due to their rareness and recurrent occurrence. Here we demonstrate the crucial role of an interior crisis in the emergence of extreme events. In parameter space we identify this interior crisis as the organizing center of the dynamics by employing concepts of mixed-mode oscillations and of leaking chaotic systems. We find that extreme events occur in certain regions in parameter space, and we show the robustness of this phenomenon with respect to the system size.

Rajat Karnatak; Gerrit Ansmann; Ulrike Feudel; Klaus Lehnertz

2014-08-27T23:59:59.000Z

252

METALLICITY DIFFERENCES IN TYPE Ia SUPERNOVA PROGENITORS INFERRED FROM ULTRAVIOLET SPECTRA  

SciTech Connect (OSTI)

Two ''twin'' Type Ia supernovae (SNe Ia), SNe 2011by and 2011fe, have extremely similar optical light-curve shapes, colors, and spectra, yet have different ultraviolet (UV) continua as measured in Hubble Space Telescope spectra and measurably different peak luminosities. We attribute the difference in the UV continua to significantly different progenitor metallicities. This is the first robust detection of different metallicities for SN Ia progenitors. Theoretical reasoning suggests that differences in metallicity also lead to differences in luminosity. SNe Ia with higher progenitor metallicities have lower {sup 56}Ni yields and lower luminosities for the same light-curve shape. SNe 2011by and 2011fe have different peak luminosities ({Delta}M{sub V} Almost-Equal-To 0.6 mag), which correspond to different {sup 56}Ni yields: M{sub 11fe}({sup 56}Ni) / M{sub 11by}({sup 56}Ni) = 1.7{sup +0.7}{sub -0.5}. From theoretical models that account for different neutron-to-proton ratios in progenitors, the differences in {sup 56}Ni yields for SNe 2011by and 2011fe imply that their progenitor stars were above and below solar metallicity, respectively. Although we can distinguish progenitor metallicities in a qualitative way from UV data, the quantitative interpretation in terms of abundances is limited by the present state of theoretical models.

Foley, Ryan J.; Kirshner, Robert P. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)

2013-05-20T23:59:59.000Z

253

Extreme ProgrammingCS4150-15 administrivia  

E-Print Network [OSTI]

Extreme ProgrammingCS4150-15 administrivia today assignment 3 due (last assignment!) extreme from original) project designs due 1 Tuesday, October 19, 2010 #12;Extreme ProgrammingCS4150-15 extreme programming extreme programming (XP) is a recent shift about the last decade plus part of agile development

Damon, Craig A.

254

CONDITIONAL EXTREMES AND NEAREXTREMES: CONCEPTS, ASYMPTOTIC THEORY, AND ECONOMIC  

E-Print Network [OSTI]

CONDITIONAL EXTREMES AND NEAR­EXTREMES: CONCEPTS, ASYMPTOTIC THEORY, AND ECONOMIC APPLICATIONS on Graduate Studies: iii #12; Abstract This dissertation develops the theory of extremal (near­extreme and extreme) quantile re­ gression: estimation, inference, and applications in economics. In particular

Gabrieli, John

255

Extremal shot noises, heavy tails and maxstable random fields.  

E-Print Network [OSTI]

Extremal shot noises, heavy tails and max­stable random fields. Clément Dombry # May 31, 2010 Abstract We consider the extremal shot noise defined by M(y) = sup{mh(y - x); (x, m) # #}, where function. Extremal shot noises naturally appear in extreme value theory as a model for spatial extremes

Recanati, Catherine

256

Extreme Web Data Integration Keynote @ ICWE 2012  

E-Print Network [OSTI]

WILD experience #12;A brief history of data Felix Naumann | Extreme Web Data Integration | ICWE 2012 3 DBMS DBMS DBMS DBMS DBMS DBMS DBMS DBMS DBMS DBMS DBMS DBMS #12;Linked Data & Data Spaces: A database guy`s point

Weske, Mathias

257

Extreme events due to localisation of energy  

E-Print Network [OSTI]

We study a one-dimensional chain of harmonically coupled units in an asymmetric anharmonic soft potential. Due to nonlinear localisation of energy, this system exhibits extreme events in the sense that individual elements of the chain show very large excitations. A detailed statistical analysis of extremes in this system reveals some unexpected properties, e.g., a pronounced pattern in the inter event interval statistics. We relate these statistical properties to underlying system dynamics, and notice that often when extreme events occur the system dynamics adopts (at least locally) an oscillatory behaviour, resulting in, for example, a quick succession of such events. The model therefore might serve as a paradigmatic model for the study of the interplay of nonlinearity, energy transport, and extreme events.

Colm Mulhern; Stephan Bialonski; Holger Kantz

2015-01-09T23:59:59.000Z

258

Changes in precipitation characteristics and extremes  

E-Print Network [OSTI]

changes in two different climate scenarios. In the Mediterranean region, precipitation amount, frequencyChanges in precipitation characteristics and extremes Comparing Mediterranean to change Swiss with climate change, with potentially severe impacts on human society and ecosystems. This study analyses

Allan, Richard P.

259

Extremal Channels for a genaral Quantum system  

E-Print Network [OSTI]

Quantum channels can be mathematically represented as completely positive trace-preserving maps that act on a density matrix. A general quantum channel can be written as a convex sum of `extremal' channels. We show that for an $N$-level system, the extremal channel can be characterized in terms of $N^2$-$N$ real parameters coupled with rotations. We give a representation for $N$= 2, 3, 4.

Kuldeep Dixit; E. C. G. Sudarshan

2009-09-21T23:59:59.000Z

260

Geophysical investigations of certain Montana geothermal areas  

SciTech Connect (OSTI)

Selected hot springs areas of Montana have been investigated by a variety of geophysical techniques. Resistivity, gravity, seismic, and magnetic methods have been applied during investigations near the hot springs. Because the geology is extremely varied at the locations of the investigations, several geophysical techniques have usually been applied at each site.

Wideman, C.J. (Montana Bureau of Mines and Geology, Butte); Dye, L.; Halvorson, J.; McRae, M.; Ruscetta, C.A.; Foley, D. (eds.)

1981-05-01T23:59:59.000Z

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

On neutral scalar radiation by a massive orbiting star in extremal Kerr-Newman black hole  

E-Print Network [OSTI]

In this short note we extend the work of 1401.3746 about gravity waves by a massive orbiting star in an extremal Kerr black hole to an extremal Kerr- Newman black hole for scalar radiation, and still find that it has a CFT interpretation from Kerr-Newman/CFT. In addition, we investigate on electromagnetic radiation with Kerr/CFT, which a detailed analysis isn't given by 1401.3746.

Nan Bai; Yi-Hong Gao; Xiao-bao Xu

2014-07-15T23:59:59.000Z

262

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

263

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

264

On the ultraviolet behaviour of quantum fields over noncommutative manifolds  

E-Print Network [OSTI]

By exploiting the relation between Fredholm modules and the Segal-Shale-Stinespring version of canonical quantization, and taking as starting point the first-quantized fields described by Connes' axioms for noncommutative spin geometries, a Hamiltonian framework for fermion quantum fields over noncommutative manifolds is introduced. We analyze the ultraviolet behaviour of second-quantized fields over noncommutative 3-tori, and discuss what behaviour should be expected on other noncommutative spin manifolds.

Varilly, J C; Varilly, Joseph C.; Gracia-Bondia, Jose M.

1999-01-01T23:59:59.000Z

265

Magnetic fluorescent lamp having reduced ultraviolet self-absorption  

DOE Patents [OSTI]

The radiant emission of a mercury-argon discharge in a fluorescent lamp assembly (10) is enhanced by providing means (30) for establishing a magnetic field with lines of force along the path of electron flow through the bulb (12) of the lamp assembly, to provide Zeeman splitting of the ultraviolet spectral line. Optimum results are obtained when the magnetic field strength causes a Zeeman splitting of approximately 1.7 times the thermal line width.

Berman, Samuel M. (San Francisco, CA); Richardson, Robert W. (Pelham, NY)

1985-01-01T23:59:59.000Z

266

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

267

Drought and the California Delta—A Matter of Extremes  

E-Print Network [OSTI]

California Delta—A Matter of Extremes Michael Dettinger 1, *1962 California is in an extreme drought as a result of lowIn large part, this extreme variability arises from the

Dettinger, Michael; Cayan, Daniel R.

2014-01-01T23:59:59.000Z

268

Extreme Value Analysis and Ventures into Space and Time  

E-Print Network [OSTI]

Extreme Value Analysis and Ventures into Space and Time 15 Center for Atmospheric Research Copyright NCAR 2013 #12;Extreme Value Analysis'arrive jamais" --Emil Gumbel Copyright NCAR 2013 Extreme Value Analysis #12;Copyright

Gilleland, Eric

269

Nanoscale Phase Transitions under Extreme Conditions within an...  

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

under extreme conditions. Citation: Zhang J, M Lang, RC Ewing, R Devanathan, WJ Weber, and M Toulemonde.2010."Nanoscale Phase Transitions under Extreme Conditions within an...

270

Extreme Temperature Energy Storage and Generation, for Cost and...  

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

Extreme Temperature Energy Storage and Generation, for Cost and Risk Reduction in Geothermal Exploration Extreme Temperature Energy Storage and Generation, for Cost and Risk...

271

Extreme Science (LBNL Science at the Theater)  

SciTech Connect (OSTI)

On Feb. 27, 2012 at the Berkeley Repertory Theatre, four Berkeley Lab scientists presented talks related to extreme science - and what it means to you. Topics include: Neutrino hunting in Antarctica. Learn why Spencer Klein goes to the ends of the Earth to search for these ghostly particles. From Chernobyl to Central Asia, Tamas Torok travels the globe to study microbial diversity in extreme environments. Andrew Minor uses the world's most advanced electron microscopes to explore materials at ultrahigh stresses and in harsh environments. And microbes that talk to computers? Caroline Ajo-Franklin is pioneering cellular-electrical connections that could help transform sunlight into fuel.

Ajo-Franklin, Caroline; Klein, Spencer; Minor, Andrew; Torok, Tamas

2012-02-27T23:59:59.000Z

272

EXTREMAL METRIC FOR THE FIRST EIGENVALUE ON A KLEIN BOTTLE  

E-Print Network [OSTI]

EXTREMAL METRIC FOR THE FIRST EIGENVALUE ON A KLEIN BOTTLE DMITRY JAKOBSON, NIKOLAI NADIRASHVILI extremal metrics. The only known extremal metrics are a round sphere, a standard projective plane, a Clifford torus and an equilateral torus. We construct an extremal metric on a Klein bottle. It is a metric

Leclercq, Remi

273

STATISTICS OF PRECIPITATION EXTREMES: QUANTIFYING CONFIDENCE IN TRENDS  

E-Print Network [OSTI]

1 STATISTICS OF PRECIPITATION EXTREMES: QUANTIFYING CONFIDENCE IN TRENDS Rick Katz Institute of the validity of this analysis." -- Emil Gumbel #12;3 Outline (1) Introduction (2) Extreme Value Analysis under Stationarity: Classical Approach (3) Extreme Value Analysis under Stationarity: Modern Approach (4) Extreme

Katz, Richard

274

STATISTICS OF EXTREMES IN CLIMATE CHANGE Richard W. Katz  

E-Print Network [OSTI]

STATISTICS OF EXTREMES IN CLIMATE CHANGE Richard W. Katz Institute for Study of Society the application of the statistical theory of extreme values to climate, in general, and to climate change, in particular. The statistical theory of extreme values is briefly reviewed, both the extremal types theorem

Katz, Richard

275

STATISTICS OF EXTREMES IN CLIMATE: RECONCILING THEORY WITH OBSERVATIONS  

E-Print Network [OSTI]

1 STATISTICS OF EXTREMES IN CLIMATE: RECONCILING THEORY WITH OBSERVATIONS Rick Katz Institute) Unified Modeling of Distributions (6) Resources #12;4 #12;5 (1) Background · Use of Extremal Models -- Stochastic weather generators Improved treatment of extremes #12;6 (2) Observed Tail Behavior · Extreme Value

Katz, Richard

276

EXTREMAL METRIC FOR THE FIRST EIGENVALUE ON A KLEIN BOTTLE  

E-Print Network [OSTI]

EXTREMAL METRIC FOR THE FIRST EIGENVALUE ON A KLEIN BOTTLE DMITRY JAKOBSON, NIKOLAI NADIRASHVILI extremal metrics. The only known extremal metrics are a round sphere, a standard projective plane, a Cli#11;ord torus and an equilateral torus. We construct an extremal metric on a Klein bottle. It is a metric

Jakobson, Dmitry

277

European Temperature Extremes: Mechanisms and Responses to Climate Change  

E-Print Network [OSTI]

European Temperature Extremes: Mechanisms and Responses to Climate Change PhD Thesis Julien temperature extremes under CC December 22, 2010 1 / 41 #12;Extremes? Why? Summer 2003: public & scientific of summer heat-waves (e.g., Fischer and Schär, 2009). Years ISI Publi's topic: 'Temperature extreme' 1985

Ribes, Aurélien

278

On Extremes and Crashes Alexander J. McNeil  

E-Print Network [OSTI]

to withstand extreme winds or extreme water levels. The 50­year return level is a level which, on averageOn Extremes and Crashes Alexander J. McNeil Departement Mathematik ETH Zentrum CH­8092 Z¨urich Tel in extreme value theory as part of his mathematics degree. He therefore decides to undertake an analysis

McNeil, Alexander J.

279

On Extremes and Crashes Alexander J. McNeil  

E-Print Network [OSTI]

extreme winds or extreme water levels. The 50-year return level is a level which, on average, should onlyOn Extremes and Crashes Alexander J. McNeil Departement Mathematik ETH Zentrum CH-8092 Zurich Tel in extreme value theory as part of his mathematics degree. He therefore decides to undertake an analysis

McNeil, Alexander J.

280

Large area, surface discharge pumped, vacuum ultraviolet light source  

DOE Patents [OSTI]

Large area, surface discharge pumped, vacuum ultraviolet (VUV) light source is disclosed. A contamination-free VUV light source having a 225 cm{sup 2} emission area in the 240-340 nm region of the electromagnetic spectrum with an average output power in this band of about 2 J/cm{sup 2} at a wall-plug efficiency of approximately 5% is described. Only ceramics and metal parts are employed in this surface discharge source. Because of the contamination-free, high photon energy and flux, and short pulse characteristics of the source, it is suitable for semiconductor and flat panel display material processing. 3 figs.

Sze, R.C.; Quigley, G.P.

1996-12-17T23:59:59.000Z

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

Aluminum nitride nanophotonic circuits operating at ultraviolet wavelengths  

SciTech Connect (OSTI)

Aluminum nitride (AlN) has recently emerged as a promising material for integrated photonics due to a large bandgap and attractive optical properties. Exploiting the wideband transparency, we demonstrate waveguiding in AlN-on-Insulator circuits from near-infrared to ultraviolet wavelengths using nanophotonic components with dimensions down to 40?nm. By measuring the propagation loss over a wide spectral range, we conclude that both scattering and absorption of AlN-intrinsic defects contribute to strong attenuation at short wavelengths, thus providing guidelines for future improvements in thin-film deposition and circuit fabrication.

Stegmaier, M.; Ebert, J.; Pernice, W. H. P., E-mail: wolfram.pernice@kit.edu [Institute of Nanotechnology, Karlsruhe Institute of Technology, 76133 Karlsruhe (Germany); Meckbach, J. M.; Ilin, K.; Siegel, M. [Institute of Micro- und Nanoelectronic Systems, Karlsruhe Institute of Technology, 76187 Karlsruhe (Germany)

2014-03-03T23:59:59.000Z

282

Graphene/GaN diodes for ultraviolet and visible photodetectors  

SciTech Connect (OSTI)

The Schottky diodes based on graphene/GaN interface are fabricated and demonstrated for the dual-wavelength photodetection of ultraviolet (UV) and green lights. The physical mechanisms of the photoelectric response of the diodes with different light wavelengths are different. For UV illumination, the photo-generated carriers lower the Schottky barrier and increase the photocurrent. For green light illumination, as the photon energy is smaller than the bandgap of GaN, the hot electrons excited in graphene via internal photoemission are responsible for the photoelectric response. Using graphene as a transparent electrode, the diodes show a ?mS photoresponse, providing an alternative route toward multi-wavelength photodetectors.

Lin, Fang; Chen, Shao-Wen; Meng, Jie; Tse, Geoffrey; Fu, Xue-Wen; Xu, Fu-Jun [State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871 (China); Shen, Bo; Liao, Zhi-Min, E-mail: liaozm@pku.edu.cn, E-mail: yudp@pku.edu.cn; Yu, Da-Peng, E-mail: liaozm@pku.edu.cn, E-mail: yudp@pku.edu.cn [State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871 (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)

2014-08-18T23:59:59.000Z

283

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

2006-10-20T23:59:59.000Z

284

Large area, surface discharge pumped, vacuum ultraviolet light source  

DOE Patents [OSTI]

Large area, surface discharge pumped, vacuum ultraviolet (VUV) light source. A contamination-free VUV light source having a 225 cm.sup.2 emission area in the 240-340 nm region of the electromagnetic spectrum with an average output power in this band of about 2 J/cm.sup.2 at a wall-plug efficiency of approximately 5% is described. Only ceramics and metal parts are employed in this surface discharge source. Because of the contamination-free, high photon energy and flux, and short pulse characteristics of the source, it is suitable for semiconductor and flat panel display material processing.

Sze, Robert C. (Santa Fe, NM); Quigley, Gerard P. (Los Alamos, NM)

1996-01-01T23:59:59.000Z

285

AIR CONDITIONER REQUEST EXTREME MEDICAL CIRCUMSTANCES  

E-Print Network [OSTI]

AIR CONDITIONER REQUEST DUE TO EXTREME MEDICAL CIRCUMSTANCES TO BE COMPLETED BY ATTENDING Moderate Significant Is the use of an air conditioner desirable Yes No OR essential Yes No to the management of allergy? Is the use of an air conditioner

286

Where is the extremal Kerr ISCO?  

E-Print Network [OSTI]

Although the circular photon orbit and ISCO for the Kerr black hole remain distinct from each other and from the horizon in the extremal spin limit on a constant Boyer-Lindquist time slice, on a horizon-crossing slice they both coincide with the null generators of the horizon.

Ted Jacobson

2012-01-10T23:59:59.000Z

287

LIFE ON EARTH: EXTREMES AND ASTROBIO IMPLICATIONS...  

E-Print Network [OSTI]

deep on the ocean floor (no oxygen). #12;#12;·Microorganisms that grow in extremely dry environments withstand 1000 times the radiation dose that would kill a human in minutes. It keeps 5 stacked copies of its thing in the solar system to another water world. An icy crust covers an ocean. #12;Europa #12

Shirley, Yancy

288

Extremes in climate science Andreas Sterl (KNMI)  

E-Print Network [OSTI]

(non-deterministic) influences: sun, volcanoes, anthropogenic effects (GHG emissions) => deterministic Sterl, PhysMathClim Climate change GHG concentrations increase => Temperature increases => other weather;31.01.2012, Utrecht Andreas Sterl, PhysMathClim EVT - 1 Extremes: tail of a distribution => few observations => tail

Stoffelen, Ad

289

Extremal structures of multiphase heat conducting composites  

E-Print Network [OSTI]

Extremal structures of multiphase heat conducting composites A.V. Cherkaev \\Lambda L.V. Gibiansky y April 19, 1995 Abstract In this paper we construct microstructures of multiphase composites with un be easily gen­ eralized for the three­dimensional composites with arbitrary number of phases. 1 Introduction

Cherkaev, Andrej

290

ECSS in the eXtreme  

E-Print Network [OSTI]

The ESAC Gaia team engages in a form of eXtreme programming while the DPAC will follow a series of six month development cycles modeled on this approach. As a project within the European Space Agency the European Committee for Space Standardization (ECSS) standards are required. We present the bringing together of these realms.

William O'Mullane; John Hoar; Uwe Lammers

2007-12-03T23:59:59.000Z

291

Extremal unital completely positive normal maps  

E-Print Network [OSTI]

We study the convex set of unital completely positive normal map on a von-Neumann algebra and find a necessary and sufficient condition for an element in the convex set to be extremal. We also deal with the same problem for the convex subset which admits a faithful normal state.

Anilesh Mohari

2013-01-11T23:59:59.000Z

292

Ultraviolet Free Electron Laser Facility preliminary design report  

SciTech Connect (OSTI)

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

293

Accident Investigations  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

This Order prescribes organizational responsibilities, authorities, and requirements for conducting investigations of certain accidents occurring at DOE sites, facilities, areas, operations, and activities.

2011-03-04T23:59:59.000Z

294

Hubble Space Telescope FOS Optical and Ultraviolet Spectroscopy of the Bow Shock HH 47A 1  

E-Print Network [OSTI]

Hubble Space Telescope FOS Optical and Ultraviolet Spectroscopy of the Bow Shock HH 47A 1 Patrick Telescope of the HH 47A bow shock and Mach disk that cover the entire spectral range between 2220 Å¡ that the Fe II line broadening must exceed that expected from thermal motions. Excitation of ultraviolet Fe II

Hartigan, Patrick

295

Extremely Metal-Poor Galaxies: The Environment  

E-Print Network [OSTI]

We have analyzed bibliographical observational data and theoretical predictions, in order to probe the environment in which extremely metal-poor dwarf galaxies (XMPs) reside. We have assessed the HI component and its relation to the optical galaxy, the cosmic web type (voids, sheets, filaments and knots), the overdensity parameter and analyzed the nearest galaxy neighbours. The aim is to understand the role of interactions and cosmological accretion flows in the XMP observational properties, particularly the triggering and feeding of the star formation. We find that XMPs behave similarly to Blue Compact Dwarfs; they preferably populate low-density environments in the local Universe: ~60% occupy underdense regions, and ~75% reside in voids and sheets. This is more extreme than the distribution of irregular galaxies, and in contrast to those regions preferred by elliptical galaxies (knots and filaments). We further find results consistent with previous observations; while the environment does determine the frac...

Filho, M E; Muñoz-Tuñón, C; Nuza, S E; Kitaura, F; Heß, S

2015-01-01T23:59:59.000Z

296

Extreme events in discrete nonlinear lattices  

E-Print Network [OSTI]

We perform statistical analysis on discrete nonlinear waves generated though modulational instability in the context of the Salerno model that interpolates between the intergable Ablowitz-Ladik (AL) equation and the nonintegrable discrete nonlinear Schrodinger (DNLS) equation. We focus on extreme events in the form of discrete rogue or freak waves that may arise as a result of rapid coalescence of discrete breathers or other nonlinear interaction processes. We find power law dependence in the wave amplitude distribution accompanied by an enhanced probability for freak events close to the integrable limit of the equation. A characteristic peak in the extreme event probability appears that is attributed to the onset of interaction of the discrete solitons of the AL equation and the accompanied transition from the local to the global stochasticity monitored through the positive Lyapunov exponent of a nonlinear map.

A. Maluckov; Lj. Hadzievski; N. Lazarides; G. P. Tsironis

2009-01-22T23:59:59.000Z

297

Ultraviolet-B Radiation Harms Aquatic Life -Current Results http://www.currentresults.com/Water/Water-Pollution/ultraviolet.php 1 of 2 8/7/2007 1:45 PM  

E-Print Network [OSTI]

Ultraviolet-B Radiation Harms Aquatic Life - Current Results http://www.currentresults.com/Water/Water-Pollution Water E Coli UVB Sunscreen #12;Ultraviolet-B Radiation Harms Aquatic Life - Current Results http://www.currentresults.com/Water/Water-Pollution/ultraviolet.php 2 of 2 8/7/2007 1:45 PM Home | About | Privacy Policy | Terms of Use | Advertise on This Site

Blaustein, Andrew R.

298

Sandia National Laboratories: resilient to extreme events  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1developmentturbineredox-active perovskiteremoving the highlypowerresilient to extreme

299

Extreme commutative quantum observables are sharp  

E-Print Network [OSTI]

It is well known that, in the description of quantum observables, positive operator valued measures (POVMs) generalize projection valued measures (PVMs) and they also turn out be more optimal in many tasks. We show that a commutative POVM is an extreme point in the convex set of all POVMs if and only if it is a PVM. This results implies that non-commutativity is a necessary ingredient to overcome the limitations of PVMs.

Teiko Heinosaari; Juha-Pekka Pellonpää

2011-06-21T23:59:59.000Z

300

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

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
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301

Chiral gravity, log gravity, and extremal CFT  

SciTech Connect (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

302

PITTING CORROSION ON MAGNESIUM ALLOYS : A COMPARATIVE STUDY OF FIELD DATA USING EXTREME VALUE  

E-Print Network [OSTI]

PITTING CORROSION ON MAGNESIUM ALLOYS : A COMPARATIVE STUDY OF FIELD DATA USING EXTREME VALUE corrosion of the magnesium alloys AZ91D and AM60B combined with different coatings on steel bolts was investigated in field corrosion tests carried out by Volvo Car Corporation. Light metals like magnesium

Maume-Deschamps, Véronique

303

Staying Green at the Extreme : Exploring Energy Challenges and Tradeoffs for  

E-Print Network [OSTI]

hierarchies) and applications (e.g., coupled simulation workflows) from an energy perspective and investigate5/13/13 1 Staying Green at the Extreme : Exploring Energy Challenges and Tradeoffs for Science Informatics Institute (RDI2) Professor, Department of Electrical & Computer Engineering Rutgers Discovery

Parashar, Manish

304

Study of Kinematics of Extreme Waves Impacting Offshore and Coastal Structures by Non Intrusive Measurement Techniques  

E-Print Network [OSTI]

from G3 appears to induce a large inundation depth in the flow along the opening. Next, green water velocities and dynamic impacts of the extreme ocean waves on a fixed offshore deck structure are investigated. The experiments focused on the impacting...

Song, Youn Kyung

2013-11-07T23:59:59.000Z

305

Development of an Extreme Environment Materials Research Facility at Princeton  

SciTech Connect (OSTI)

The need for a fundamental understanding of material response to a neutron and/or high heat flux environment can yield development of improved materials and operations with existing materials. Such understanding has numerous applications in fields such as nuclear power (for the current fleet and future fission and fusion reactors), aerospace, and other research fields (e.g., high-intensity proton accelerator facilities for high energy physics research). A proposal has been advanced to develop a facility for testing various materials under extreme heat and neutron exposure conditions at Princeton. The Extreme Environment Materials Research Facility comprises an environmentally controlled chamber (48 m^3) capable of high vacuum conditions, with extreme flux beams and probe beams accessing a central, large volume target. The facility will have the capability to expose large surface areas (1 m^2) to 14 MeV neutrons at a fluence in excess of 10^13 n/s. Depending on the operating mode. Additionally beam line power on the order of 15-75 MW/m2 for durations of 1-15 seconds are planned... The multi-second duration of exposure can be repeated every 2-10 minutes for periods of 10-12 hours. The facility will be housed in the test cell that held the Tokamak Fusion Test Reactor (TFTR), which has the desired radiation and safety controls as well as the necessary loading and assembly infrastructure. The facility will allow testing of various materials to their physical limit of thermal endurance and allow for exploring the interplay between radiation-induced embrittlement, swelling and deformation of materials, and the fatigue and fracturing that occur in response to thermal shocks. The combination of high neutron energies and intense fluences will enable accelerated time scale studies. The results will make contributions for refining predictive failure modes (modeling) in extreme environments, as well as providing a technical platform for the development of new alloys, new materials, and the investigation of repair mechanisms. Effects on materials will be analyzed with in situ beam probes and instrumentation as the target is exposed to radiation, thermal fluxes and other stresses. Photon and monochromatic neutron fluxes, produced using a variable-energy (4-45 MeV) electron linac and the highly asymmetric electron-positron collisions technique used in high-energy physics research, can provide non-destructive, deep-penetrating structural analysis of materials while they are undergoing testing. The same beam lines will also be able to generate neutrons from photonuclear interactions using existing Bremsstrahlung and positrons on target quasi-monochromatic gamma rays. Other diagnostics will include infrared cameras, residual gas analyzer (RGA), and thermocouples; additional diagnostic capability will be added.

Cohen, A B; Tully, C G; Austin, R; Calaprice, F; McDonald, K; Ascione, G; Baker, G; Davidson, R; Dudek, L; Grisham, L; Kugel, H; Pagdon, K; Stevenson, T; Woolley, R

2010-11-17T23:59:59.000Z

306

Standoff ultraviolet raman scattering detection of trace levels of explosives.  

SciTech Connect (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

307

Laser plasma formation assisted by ultraviolet pre-ionization  

SciTech Connect (OSTI)

We present experimental and modeling studies of air pre-ionization using ultraviolet (UV) laser pulses and its effect on laser breakdown of an overlapped near-infrared (NIR) pulse. Experimental studies are conducted with a 266?nm beam (fourth harmonic of Nd:YAG) for UV pre-ionization and an overlapped 1064?nm NIR beam (fundamental of Nd:YAG), both having pulse duration of ?10?ns. Results show that the UV beam produces a pre-ionized volume which assists in breakdown of the NIR beam, leading to reduction in NIR breakdown threshold by factor of >2. Numerical modeling is performed to examine the ionization and breakdown of both beams. The modeled breakdown threshold of the NIR, including assist by pre-ionization, is in reasonable agreement with the experimental results.

Yalin, Azer P., E-mail: ayalin@engr.colostate.edu; Dumitrache, Ciprian [Department of Mechanical Engineering, Colorado State University, Fort Collins, Colorado 80523 (United States); Wilvert, Nick [Sandia Laboratory, Albuquerque, New Mexico 87123 (United States); Joshi, Sachin [Cummins Inc., Columbus, Indiana 47201 (United States); Shneider, Mikhail N. [Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544 (United States)

2014-10-15T23:59:59.000Z

308

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

309

Sensitivity of tropical precipitation extremes to climate change  

E-Print Network [OSTI]

Precipitation extremes increase in intensity over many regions of the globe in simulations of a warming climate1, 2, 3. The rate of increase of precipitation extremes in the extratropics is consistent across global climate ...

O'Gorman, Paul Ambrose

310

DOE Zero Energy Ready Home Case Study: Green Extreme Homes &...  

Energy Savers [EERE]

Green Extreme Homes & Carl Franklin Homes, Garland, TX DOE Zero Energy Ready Home Case Study: Green Extreme Homes & Carl Franklin Homes, Garland, TX Case study of a DOE Zero Energy...

311

Tunnel-injection quantum dot deep-ultraviolet light-emitting diodes with polarization-induced doping in III-nitride heterostructures  

SciTech Connect (OSTI)

Efficient semiconductor optical emitters in the deep-ultraviolet spectral window are encountering some of the most deep rooted problems of semiconductor physics. In III-Nitride heterostructures, obtaining short-wavelength photon emission requires the use of wide bandgap high Al composition AlGaN active regions. High conductivity electron (n-) and hole (p-) injection layers of even higher bandgaps are necessary for electrical carrier injection. This approach requires the activation of very deep dopants in very wide bandgap semiconductors, which is a difficult task. In this work, an approach is proposed and experimentally demonstrated to counter the challenges. The active region of the heterostructure light emitting diode uses ultrasmall epitaxially grown GaN quantum dots. Remarkably, the optical emission energy from GaN is pushed from 365?nm (3.4?eV, the bulk bandgap) to below 240?nm (>5.2?eV) because of extreme quantum confinement in the dots. This is possible because of the peculiar bandstructure and band alignments in the GaN/AlN system. This active region design crucially enables two further innovations for efficient carrier injection: Tunnel injection of carriers and polarization-induced p-type doping. The combination of these three advances results in major boosts in electroluminescence in deep-ultraviolet light emitting diodes and lays the groundwork for electrically pumped short-wavelength lasers.

Verma, Jai, E-mail: jverma@nd.edu; Islam, S. M.; Protasenko, Vladimir; Kumar Kandaswamy, Prem; Xing, Huili; Jena, Debdeep [Department of Electrical Engineering, University of Notre Dame, Notre Dame, Indiana 46556 (United States)

2014-01-13T23:59:59.000Z

312

Scaling Extreme Astrophysical Phenomena to the Laboratory  

SciTech Connect (OSTI)

High-energy-density (HED) physics refers broadly to the study of macroscopic collections of matter under extreme conditions of temperature and density. The experimental facilities most widely used for these studies are high-power lasers and magnetic-pinch generators. The HED physics pursued on these facilities is still in its infancy, yet new regimes of experimental science are emerging. Examples from astrophysics include work relevant to planetary interiors, supernovae, astrophysical jets, and accreting compact objects (such as neutron stars and black holes). In this paper, we review a selection of recent results in this new field of HED laboratory astrophysics and provide a brief look ahead to the coming decade.

Remington, B A

2007-11-01T23:59:59.000Z

313

Chaotic Information Processing by Extremal Black Holes  

E-Print Network [OSTI]

We review an explicit regularization of the AdS$_2$/CFT$_1$ correspondence, that preserves all isometries of bulk and boundary degrees of freedom. This scheme is useful to characterize the space of the unitary evolution operators that describe the dynamics of the microstates of extremal black holes in four spacetime dimensions. Using techniques from algebraic number theory to evaluate the transition amplitudes, we remark that the regularization scheme expresses the fast quantum computation capability of black holes as well as its chaotic nature.

Axenides, Minos; Nicolis, Stam

2015-01-01T23:59:59.000Z

314

Extremely compliant and highly stretchable patterned graphene  

SciTech Connect (OSTI)

Graphene is intrinsically ultra-stiff in its plane. Its huge mechanical mismatch when interfacing with ultra-compliant biological tissues and elastomers (7–9 orders of magnitude difference in stiffness) poses significant challenge in its application to functional devices such as epidermal electronics and sensing prosthesis. We offer a feasible and promising solution to this significant challenge by suitably patterning graphene into a nanomesh. Through systematic coarse-grained simulations, we show that graphene nanomesh can be made extremely compliant with nearly zero stiffness up to about 20% elongation and then remain highly compliant up to about 50% elongation.

Zhu, Shuze; Huang, Yinjun; Li, Teng, E-mail: LiT@umd.edu [Department of Mechanical Engineering and Maryland NanoCenter, University of Maryland, College Park, Maryland 20742 (United States)

2014-04-28T23:59:59.000Z

315

Extreme Scale Computing, Co-design  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: Vegetation ProposedUsing ZirconiaPolicy andExsolution Enhanced OilExtracting theExtreme Scale Computing,

316

Managing Upper extremity Fx's Sweden 10-Managing Pediatric  

E-Print Network [OSTI]

Managing Upper extremity Fx's Sweden 10- 05 1 Managing Pediatric Fractures Andrew Pennock, M extremity Fx's Sweden 10- 05 2 Children Are Not Miniature Adults! · Open Growth Plates · Remodeling is Changing "Citius, Altius, Fortius" - Faster, Higher, Stronger #12;Managing Upper extremity Fx's Sweden 10

Squire, Larry R.

317

PROBLEM APPLICATIONS: EXERCISE SESSION ON ANALYSES OF EXTREMES  

E-Print Network [OSTI]

PROBLEM APPLICATIONS: EXERCISE SESSION ON ANALYSES OF EXTREMES Rick Katz Institute for Study exercises) serves as a companion to the lecture by Richard Smith on Extreme Value Theory. It consists of two parts, the first focuses on climate applications of extreme value theory under stationarity, the second

Katz, Richard

318

Extreme Response Analysis A. Naess1,2)  

E-Print Network [OSTI]

NTNU Extreme Response Analysis A. Naess1,2) 1) Centre for Ships and Ocean Structures (CeSOS) 2) Department of Mathematical Sciences Norwegian University of Science and Technology Trondheim, Norway Extreme Response Analysis ­ p. 1/33 #12;NTNU Introduction The approach to extreme value statistics generally

Nørvåg, Kjetil

319

Climatic extremes improve predictions of spatial patterns of tree species  

E-Print Network [OSTI]

Climatic extremes improve predictions of spatial patterns of tree species Niklaus E. Zimmermanna,1 of climate extremes suggests the importance of understanding their additional influence on range limits. Here, we assess how measures representing climate extremes (i.e., interannual variability in climate

Zimmermann, Niklaus E.

320

SEASONAL CLIMATE EXTREMES: MECHANISMS, PREDICTABILITY AND RESPONSES TO GLOBAL  

E-Print Network [OSTI]

SEASONAL CLIMATE EXTREMES: MECHANISMS, PREDICTABILITY AND RESPONSES TO GLOBAL WARMING Mxolisi Excellent Shongwe #12;ISBN : 978-90-902-5046-5 #12;SEASONAL CLIMATE EXTREMES: MECHANISMS, PREDICTABILITY;. . . Dedicated to my late father John Mabhensa Shongwe #12;ABSTRACT Climate extremes are rarely occurring natural

Haak, Hein

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

Robust Extremes in Chaotic Deterministic Systems Renato Vitolo,  

E-Print Network [OSTI]

Robust Extremes in Chaotic Deterministic Systems Renato Vitolo, Mark P. Holland, and Christopher A: December 11, 2008) Abstract A chaotic deterministic system exhibits robust extremes when the statistics of its extreme values depend smoothly on the system's control parameters. Such robustness can

322

Ecosystem recovery after climatic extremes enhanced by genotypic diversity  

E-Print Network [OSTI]

Ecosystem recovery after climatic extremes enhanced by genotypic diversity Thorsten B. H. Reusch with such climatic extremes is a question central to contem- porary ecology and biodiversity conservation. Previous, and it may buffer against extreme climatic events. In a manipulative field experiment, increasing

Myers, Ransom A.

323

Extremal Properties of Random Structures E. Ben-Naim1  

E-Print Network [OSTI]

Extremal Properties of Random Structures E. Ben-Naim1 , P. L. Krapivsky2 , and S. Redner2 1. The extremal characteristics of random structures, including trees, graphs, and networks, are discussed. A statistical physics approach is employed in which extremal properties are obtained through suitably defined

Redner, Sidney

324

Extreme English Origins of English and its Sibling, Frisian  

E-Print Network [OSTI]

Extreme English Origins of English and its Sibling, Frisian Eric Gilleland National Center always has been." Chicago Tribune, May 17, 2005 By Nathan Bierma #12;Extreme English -- 23 April 2009 similar to English? #12;Extreme English -- 23 April 2009 Earliest Record of English "This she

Gilleland, Eric

325

Extreme-Point Stability Tests for Discrete-Time Polynomials  

E-Print Network [OSTI]

TA9 -10:40 Extreme-Point Stability Tests for Discrete-Time Polynomials F. PCrez *, C been an increasinginterest in finding extreme- point results for the study of stability of uncertain in the coefficients space where Schur stability of the extremes im- plies the stability of the entire family 12). Our

326

Issue: April 2013 Algae Go to Extremes with "Borrowed" Genes  

E-Print Network [OSTI]

Issue: April 2013 Algae Go to Extremes with "Borrowed" Genes by Patricia Waldron Brand-New Genes their extreme environment. For example, some bacteria that live at high temperatures have special molecules that are highly acidic, or full of toxic metals. While most microbes that live in extreme environments

Schönknecht, Gerald

327

Science moves forward, at least in part, by pursuing extremes  

E-Print Network [OSTI]

Science moves forward, at least in part, by pursuing extremes -- seeking what's faster, hotter into space. In chasing such extremes, we often pass milestones, sometimes almost without noticing. Seventy inability to produce the extreme conditions required to see them. But with the rapid and continuing

Loss, Daniel

328

RisR1238(EN) Extreme Winds over Denmark  

E-Print Network [OSTI]

Risø­R­1238(EN) Extreme Winds over Denmark from the NCEP/NCAR Reanalysis Helmut P. Frank Wind Laboratory, Roskilde, Denmark May 2001 #12;Abstract An extreme wind analysis of wind speed calculatedPa, and geostrophic winds at 850 hPa, 1000 hPa, and at the sea level are analyzed. At 10 m height the expected extreme

329

Seasonal Forecasting of Extreme Wind and Precipitation Frequencies in Europe  

E-Print Network [OSTI]

Seasonal Forecasting of Extreme Wind and Precipitation Frequencies in Europe Matthew J. Swann;Abstract Flood and wind damage to property and livelihoods resulting from extreme precipitation events variability of these extreme events can be closely related to the large-scale atmospheric circulation

Feigon, Brooke

330

Performance of building cladding in urban environments under extreme winds  

E-Print Network [OSTI]

Performance of building cladding in urban environments under extreme winds By Tiphaine Williamsa ABSTRACT: When tropical storms, hurricanes, typhoons and other extreme wind events make landfall-rise construction in these regions, as well as other areas impacted by extreme wind events, generally reveal

Kareem, Ahsan

331

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. An ultraviolet or x-ray laser pulse of long duration is progressively refracted, across the surface of an opaque barrier, by a streaming plasma that is produced by illuminating a solid target with a pulse of conventional line focused high power laser radiation. The short pulse of ultraviolet or x-ray laser radiation, which may be amplified to high power, is separated out by passage through a slit aperture in the opaque barrier.

MacGowan, B.J.; Matthews, D.L.; Trebes, J.E.

1987-05-05T23:59:59.000Z

332

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

333

Accident Investigations  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

To prescribe requirements for conducting investigations of certain accidents occurring at Department of Energy (DOE) operations and sites; to improve the environment, safety and health for DOE, contractors, and the public; and to prevent the recurrence of such accidents. Chg 2, 4-26-96

1996-04-26T23:59:59.000Z

334

Accident Investigations  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

To prescribe requirements for conducting investigations of certain accidents occurring at Department of Energy (DOE) operations and sites; to improve the environment , safety and health for DOE, contractors, and the public; and to prevent the recurrence of such accidents. Chg 1, 10-26-95. Cancels parts of DOE 5484.1

1995-10-26T23:59:59.000Z

335

Modeling hydrologic and water quality extremes in a changing climate: A statistical approach based on extreme value theory  

E-Print Network [OSTI]

Modeling hydrologic and water quality extremes in a changing climate: A statistical approach based on extreme value theory Erin Towler,1,2 Balaji Rajagopalan,1,3 Eric Gilleland,2 R. Scott Summers,1 David makes quantifying changes to hydrologic extremes, as well as associated water quality effects

Katz, Richard

336

Facilitating Co-Design for Extreme-Scale Systems Through Lightweight Simulation  

SciTech Connect (OSTI)

This work focuses on tools for investigating algorithm performance at extreme scale with millions of concurrent threads and for evaluating the impact of future architecture choices to facilitate the co-design of high-performance computing (HPC) architectures and applications. The approach focuses on lightweight simulation of extreme-scale HPC systems with the needed amount of accuracy. The prototype presented in this paper is able to provide this capability using a parallel discrete event simulation (PDES), such that a Message Passing Interface (MPI) application can be executed at extreme scale, and its performance properties can be evaluated. The results of an initial prototype are encouraging as a simple 'hello world' MPI program could be scaled up to 1,048,576 virtual MPI processes on a four-node cluster, and the performance properties of two MPI programs could be evaluated at up to 16,384 virtual MPI processes on the same system.

Engelmann, Christian [ORNL; Lauer, Frank [ORNL

2010-01-01T23:59:59.000Z

337

STATISTICS OF EXTREMES IN CLIMATOLOGY AND HYDROLOGY PART II: RECONCILING THEORY WITH OBSERVATIONS  

E-Print Network [OSTI]

1 STATISTICS OF EXTREMES IN CLIMATOLOGY AND HYDROLOGY PART II: RECONCILING THEORY WITH OBSERVATIONS of Climate/Hydrologic Extremes (3) Unified Approach (Extremes/Non-Extremes) (4) Complex Extreme Climate Design -- No longer only need for extreme value theory · Complex Extreme Events -- e. g., heat waves

Katz, Richard

338

Towards Extreme(ly) Usable Software: Exploring Tensions Between Usability and Agile Software Development  

E-Print Network [OSTI]

that draws from extreme programming (XP), a widely practiced agile software development process, and scenario that need to be addressed for agile software development methods and usability engineering practices to work with multidisciplinary system design--focusing specifically on agile software development and usability----by developing

McCrickard, Scott

339

Vacuum-ultraviolet (VUV) photoionization of small methanol and methanol-water clusters  

SciTech Connect (OSTI)

In this work we report on thevacuum-ultraviolet (VUV) photoionization of small methanol and methanol-water clusters. Clusters of methanol with water are generated via co-expansion of the gas phase constituents in a continuous supersonic jet expansion of methanol and water seeded in Ar. The resulting clusters are investigated by single photon ionization with tunable vacuumultraviolet synchrotron radiation and mass analyzed using reflectron mass spectrometry. Protonated methanol clusters of the form (CH3OH)nH + (n=1-12) dominate the mass spectrum below the ionization energy of the methanol monomer. With an increase in water concentration, small amounts of mixed clusters of the form (CH3OH)n(H2O)H + (n=2-11) are detected. The only unprotonated species observed in this work are the methanol monomer and dimer. Appearance energies are obtained from the photoionization efficiency (PIE) curves for CH3OH +, (CH 3OH)2 +, (CH3OH)nH + (n=1-9), and (CH 3OH)n(H2O)H + (n=2-9 ) as a function of photon energy. With an increase in the water content in the molecular beam, there is an enhancement of photoionization intensity for methanol dimer and protonated methanol monomer at threshold. These results are compared and contrasted to previous experimental observations.

Ahmed, Musahid; Ahmed, Musahid; Wilson, Kevin R.; Belau, Leonid; Kostko, Oleg

2008-05-12T23:59:59.000Z

340

1 MODELING THE PERFORMANCE OF ULTRAVIOLET REACTOR IN EULERIAN AND LAGRANGIAN FRAMEWORKS  

E-Print Network [OSTI]

CFD models for simulating the performance of ultraviolet (UV) reactors for micro-organism inactivation were developed in Eulerian and Lagrangian frameworks, taking into account hydrodynamics, kinetics, and radiation field within UV reactor. In the Lagrangian framework, micro-organisms were treated as discrete particles where the trajectory was predicted by integrating the force balance on the particle. In the Eulerian framework, the conservation equation of species (microorganisms) was solved along with the transport equations. The fluid flow was characterized experimentally using particle image velocimetry (PIV) flow visualization techniques and modeled using CFD for a UV reactor prototype model. The performance of annular UV reactors with an inlet parallel and perpendicular to the reactor axis were investigated. The results indicated that the fluid flow distribution within the reactor volume can significantly affect the reactor performance. Both the Eulerian and Lagrangian models were used to obtain complimentary information on the reactors; while the Lagrangian method provided an estimation of the UV-fluence distribution and the trajectory of species, the Eulerian approach showed the concentration distribution and local photo-reaction rates. The combined information can be used to predict and monitor reactor performance and to improve the reactor design.

Angelo Sozzi; Fariborz Taghipour

2006-01-01T23:59:59.000Z

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.


341

EVIDENCE FOR TYPE Ia SUPERNOVA DIVERSITY FROM ULTRAVIOLET OBSERVATIONS WITH THE HUBBLE SPACE TELESCOPE  

E-Print Network [OSTI]

We present ultraviolet (UV) spectroscopy and photometry of four Type Ia supernovae (SNe 2004dt, 2004ef, 2005M, and 2005cf) obtained with the UV prism of the Advanced Camera for Surveys on the Hubble Space Telescope. This ...

Lewin, Walter H. G.

342

E-Print Network 3.0 - algan-based deep ultraviolet Sample Search...  

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

GanAlgan- Based Laser Diodes with Modulation-Doped Strained... in ultraviolet optoelectronics2-4 , room temperature lasing5-8 , and solar cells applications9... -LEDs and...

343

High-Intensity Coherent Vacuum Ultraviolet Source Using Unfocussed Commercial Dye Lasers  

E-Print Network [OSTI]

1 High-Intensity Coherent Vacuum Ultraviolet Source Using Unfocussed Commercial Dye Lasers Daniel R Intruments Using two or three commercial pulsed nanosecond dye lasers pumped by a single 30 Hz Nd:YAG laser

Davis, H. Floyd

344

Microbial Reduction on Eggshell Surfaces by the use of Hydrogen Peroxide and Ultraviolet Light  

E-Print Network [OSTI]

) in combination with ultraviolet light (UV) as an egg sanitization process on eggshell surfaces was studied. Preliminary experiments were conducted to develop an optimized methodology for eggshell disinfection that will be an effective and efficient way to reduce...

Gottselig, Steven Michael

2011-10-21T23:59:59.000Z

345

The O iv and S iv intercombination lines in the ultraviolet spectra of astrophysical sources  

E-Print Network [OSTI]

, obtained with the Solar Ultraviolet Measurements of the Emitted Radiation (sumer) instrument on the Solar/09/2002; 9:46; p.1 #12; 2 Keenan et al. line ratios and observational data. For example, Cook et al. (1995

346

Tryptophan Cluster Protects Human ?D-Crystallin from Ultraviolet Radiation-Induced Photoaggregation  

E-Print Network [OSTI]

Exposure to ultraviolet radiation (UVR) is a significant risk factor for age-related cataract, a disease of the human lens and the most prevalent cause of blindness in the world. Cataract pathology involves protein misfolding ...

Schafheimer, Steven Nathaniel

347

Three Essays on the Impact of Climate Change and Weather Extremes on the United States' Agriculture  

E-Print Network [OSTI]

ii Contents Essay 3 Impact of Extreme Heating Condition on2 Modeling the Impact of Extreme Heating on FarmlandSuggests that Recent Extreme Droughts Contributed to

Le, Phu Viet

2013-01-01T23:59:59.000Z

348

Oxygen Loss from Venus and the Influence of Extreme Solar Wind Conditions  

E-Print Network [OSTI]

the influence of extreme solar wind conditions on O + escapeand the Influence of Extreme Solar Wind Conditions by Tessand the Influence of Extreme Solar Wind Conditions Copyright

McEnulty, Tess

2012-01-01T23:59:59.000Z

349

Non-extremal fuzzballs and ergoregion emission  

E-Print Network [OSTI]

In the traditional picture of black holes Hawking radiation is created by pair creation from the vacuum at the horizon. In the fuzzball proposal, individual microstates do not have a horizon with the `vacuum' state in its vicinity. For a special family of non-extremal microstates it was recently found that emission occurs due to pair creation in an ergoregion, rather than at a horizon. In this paper we extend this result to a slightly larger class of microstates, again finding exact agreement between the emission in the gravity picture and the CFT dual. We write down an expression for emission from geometries with ergoregions, in terms of the leading falloff behavior of the wavefunctions in the fuzzball region. Finally, we describe another family of nonextremal microstates and find their ergoregion.

Borun D. Chowdhury; Samir D. Mathur

2008-10-23T23:59:59.000Z

350

Left-Wing Extremism: The Current Threat  

SciTech Connect (OSTI)

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

351

A Road Map to Extreme High Vacuum  

SciTech Connect (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

352

The Far-Ultraviolet Ups and Downs of Alpha Centauri  

E-Print Network [OSTI]

Four years (2010-2014) of semiannual pointings by Hubble Space Telescope Imaging Spectrograph (STIS) on nearby Alpha Centauri have yielded a detailed time history of far-ultraviolet emissions of the solar-like primary (A: G2V) and the cooler, but more active, secondary (B: K1V). This period saw A climbing out of a prolonged coronal X-ray minimum, as documented by Chandra, while B was rising to, then falling from, a peak of its long-term (8 yr) starspot cycle. The FUV fluxes of the primary were steady over most of the STIS period, although the [Fe XII] 124 nm coronal forbidden line (T= 1.5 MK) partly mirrored the slowly rising X-ray fluxes. The FUV emissions of the secondary more closely tracked the rise and fall of its coronal luminosities, especially the "hot lines" like Si IV, C IV, and N V (T= 80,000-200,000 K), and coronal [Fe XII] itself. The hot lines of both stars were systematically redshifted, relative to narrow chromospheric emissions, by several km/s, showing little change in amplitude over the 4-y...

Ayres, Thomas R

2014-01-01T23:59:59.000Z

353

The Swift-UVOT ultraviolet and visible grism calibration  

E-Print Network [OSTI]

We present the calibration of the Swift UVOT grisms, of which there are two, providing low-resolution field spectroscopy in the ultraviolet and optical bands respectively. The UV grism covers the range 1700-5000 Angstrom with a spectral resolution of 75 at 2600 Angstrom for source magnitudes of u=10-16 mag, while the visible grism covers the range 2850-6600 Angstrom with a spectral resolution of 100 at 4000 Angstrom for source magnitudes of b=12-17 mag. This calibration extends over all detector positions, for all modes used during operations. The wavelength accuracy (1-sigma) is 9 Angstrom in the UV grism clocked mode, 17 Angstrom in the UV grism nominal mode and 22 Angstrom in the visible grism. The range below 2740 Angstrom in the UV grism and 5200 Angstrom in the visible grism never suffers from overlapping by higher spectral orders. The flux calibration of the grisms includes a correction we developed for coincidence loss in the detector. The error in the coincidence loss correction is less than 20%. The...

Kuin, N P M; Breeveld, A A; Page, M J; James, C; Lamoureux, H; Mehdipour, M; Still, M; Yershov, V; Brown, P J; Carter, M; Mason, K O; Kennedy, T; Marshall, F; Roming, P W A; Siegel, M; Oates, S; Smith, P J; De Pasquale, M

2015-01-01T23:59:59.000Z

354

Extreme Environment Silicon Carbide Hybrid Temperature & Pressure Optical Sensors  

SciTech Connect (OSTI)

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

355

Extremal correlations of the tripartite no-signaling polytope  

E-Print Network [OSTI]

The no-signaling polytope associated to a Bell scenario with three parties, two inputs, and two outputs is found to have 53856 extremal points, belonging to 46 inequivalent classes. We provide a classification of these points according to various definitions of multipartite non-locality and briefly discuss other issues like the interconversion between extremal points seen as a resource and the relation of the extremal points to Bell-type inequalities.

Stefano Pironio; Jean-Daniel Bancal; Valerio Scarani

2011-01-13T23:59:59.000Z

356

Extremal Graph Numbers of Graphs on Few May 4, 2012  

E-Print Network [OSTI]

Extremal Graph Numbers of Graphs on Few Vertices John Kim May 4, 2012 1 Introduction Let H this number to be the extremal graph number of H on n vertices, and we denote it by ex(n, H). When H(n, K3) n 2 2 . A precise formula for ex(n, K3) is given by: ex(n, K3) = n 2 n + 1 2 . The extremal

Zeilberger, Doron

357

An investigation of symmetry in upper extremity strength during sagittal plane lifting tasks  

E-Print Network [OSTI]

438. 76 461. 61 S. D. 26. 73 29. 60 18. 40 25. 03 103. 42 86. 07 Note: Data collected at a rate of 50 Hz. 52 APPENDIX I LIFTING TESTS DATA 53 LIFTING TESTS DATA (N) STOOP LIFT Left Ri ht SQUAT LIFT Left Ri ht Sub'ect Trial Av . S. D. Av . S.... D. Av . S. D. Av . S. D 2 137. 89 1. 97 118. 05 5. 30 162. 09 7. 77 148. 83 10. 75 3 113. 11 5. 56 97. 01 5. 14 120. 05 3. 83 130. 33 3. 72 4 143. 98 11. 16 134. 55 5. 78 119. 56 5. 77 129. 57 4. 50 2 134. 06 13. 08 88. 69 10. 18 135. 31 9. 04...

Key, Wendy Ross

1994-01-01T23:59:59.000Z

358

Predictability of extreme events in a branching diffusion model Abstract  

E-Print Network [OSTI]

... electric power blackouts, economic recessions, stock-market crashes, .... the extreme ones, a cascade process responsible for redistribution of energy (or.

2010-01-15T23:59:59.000Z

359

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 Facebook Twitter Youtube Flickr RSS People Mission Managing...

360

An electronic compendium of extreme functions for the Gomory  

E-Print Network [OSTI]

Nov 18, 2014 ... Abstract: In this note we announce the availability of an electronic compendium of extreme functions for Gomory--Johnson's infinite group ...

Matthias Köppe

2014-11-18T23:59:59.000Z

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.


361

Extreme point inequalities and geometry of the rank sparsity ball  

E-Print Network [OSTI]

ities balancing the various features of the optimization problem at hand, at the extreme points of the solution set. Keywords Nuclear norm · compressed sensing

2014-01-19T23:59:59.000Z

362

Joint probability analysis of precipitation and streamflow extremes.  

E-Print Network [OSTI]

??This thesis focuses on evaluation of joint occurrence of extreme precipitation and streamflow events at several hydrologic structures in South Florida. An analysis of twelve… (more)

Lin, Chia-hung.

2013-01-01T23:59:59.000Z

363

Seasonal Climate Extremes : Mechanism, Predictability and Responses to Global Warming.  

E-Print Network [OSTI]

??Climate extremes are rarely occurring natural phenomena in the climate system. They often pose one of the greatest environmental threats to human and natural systems.… (more)

Shongwe, M.E.

2010-01-01T23:59:59.000Z

364

Radiation from the non-extremal fuzzball  

E-Print Network [OSTI]

The fuzzball proposal says that the information of the black hole state is distributed throughout the interior of the horizon in a `quantum fuzz'. There are special microstates where in the dual CFT we have `many excitations in the same state'; these are described by regular classical geometries without horizons. Jejjala et.al constructed non-extremal regular geometries of this type. Cardoso et. al then found that these geometries had a classical instability. In this paper we show that the energy radiated through the unstable modes is exactly the Hawking radiation for these microstates. We do this by (i) starting with the semiclassical Hawking radiation rate (ii) using it to find the emission vertex in the CFT (iii) replacing the Boltzman distributions of the generic CFT state with the ones describing the microstate of interest (iv) observing that the emission now reproduces the classical instability. Because the CFT has `many excitations in the same state' we get the physics of a Bose-Einstein condensate rather than a thermal gas, and the usually slow Hawking emission increases, by Bose enhancement, to a classically radiated field. This system therefore provides a complete gravity description of information-carrying radiation from a special microstate of the nonextremal hole.

Borun D. Chowdhury; Samir D. Mathur

2008-06-27T23:59:59.000Z

365

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

SciTech Connect (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

366

Excitation of helium Rydberg states and doubly excited resonances in strong extreme ultraviolet fields: Full-dimensional quantum dynamics using exponentially tempered Gaussian basis sets  

SciTech Connect (OSTI)

Recently optimized exponentially tempered Gaussian basis sets [P. R. Kapralova-Zdanska and J. Smydke, J. Chem. Phys. 138, 024105 (2013)] are employed in quantitative simulations of helium absorption cross-sections and two-photon excitation yields of doubly excited resonances. Linearly polarized half-infinite and Gaussian laser pulses at wavelengths 38–58 nm and large intensities up to 100 TW/cm{sup 2} are considered. The emphasis is laid on convergence of the results with respect to the quality of the Gaussian basis sets (typically limited by a number of partial waves, density, and spatial extent of the basis functions) as well as to the quality of the basis set of field-free states (typically limited by the maximum rotational quantum number and maximum excitation of the lower electron). Particular attention is paid to stability of the results with respect to varying complex scaling parameter. Moreover, the study of the dynamics is preceded by a thorough check of helium energies and oscillator strengths as they are obtained with the exponentially tempered Gaussian basis sets, being also compared with yet unpublished emission wavelengths measured in electric discharge experiments.

Kaprálová-Ž?ánská, Petra Ruth; Šmydke, Jan [J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, 182 23 Prague 8 (Czech Republic) [J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, 182 23 Prague 8 (Czech Republic); Department of Radiation and Chemical Physics, Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague 8 (Czech Republic); Civiš, Svatopluk [J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, 182 23 Prague 8 (Czech Republic)] [J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, 182 23 Prague 8 (Czech Republic)

2013-09-14T23:59:59.000Z

367

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

E-Print Network [OSTI]

Plasma Diagnostics ..Principles of plasma diagnostics Cambridge University Press,the laser pulse. Plasma Diagnostics 2.6.1. Electron Density

Yuspeh, Samuel Edward

2011-01-01T23:59:59.000Z

368

Extreme-ultraviolet polarimeter utilizing laser-generated high-order Nicole Brimhall, Matthew Turner, Nicholas Herrick, David D. Allred, R. Steven Turley,  

E-Print Network [OSTI]

with a repetition rate of 10 Hz. Per-shot energy monitoring of the laser discriminates against fluctuations, the instrument could conceivably operate through other ranges of harmonic wavelengths. An advantage of high har of high harmonic EUV light to be easily rotated using a half-wave plate in the generating laser beam

Hart, Gus

369

The Effects of Oxygen Plasma on the Chemical Composition and Morphology of the Ru Capping Layer of the Extreme Ultraviolet (EUV) Mask Blanks  

E-Print Network [OSTI]

P-5B-03 The effects of oxygen plasma on the chemicalRu) mask surface after oxygen plasma treatment using surfacein the subsurface oxygen concentration, Ru oxidation and

Belau, Leonid

2009-01-01T23:59:59.000Z

370

OBSERVATIONS AND MODELING OF THE EMERGING EXTREME-ULTRAVIOLET LOOPS IN THE QUIET SUN AS SEEN WITH THE SOLAR DYNAMICS OBSERVATORY  

SciTech Connect (OSTI)

We used data from the Helioseismic and Magnetic Imager (HMI) and the Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory (SDO) to study coronal loops at small scales, emerging in the quiet Sun. With HMI line-of-sight magnetograms, we derive the integrated and unsigned photospheric magnetic flux at the loop footpoints in the photosphere. These loops are bright in the EUV channels of AIA. Using the six AIA EUV filters, we construct the differential emission measure (DEM) in the temperature range 5.7-6.5 in log T (K) for several hours of observations. The observed DEMs have a peak distribution around log T Almost-Equal-To 6.3, falling rapidly at higher temperatures. For log T < 6.3, DEMs are comparable to their peak values within an order of magnitude. The emission-weighted temperature is calculated, and its time variations are compared with those of magnetic flux. We present two possibilities for explaining the observed DEMs and temperatures variations. (1) Assuming that the observed loops are composed of a hundred thin strands with certain radius and length, we tested three time-dependent heating models and compared the resulting DEMs and temperatures with the observed quantities. This modeling used enthalpy-based thermal evolution of loops (EBTEL), a zero-dimensional (0D) hydrodynamic code. The comparisons suggest that a medium-frequency heating model with a population of different heating amplitudes can roughly reproduce the observations. (2) We also consider a loop model with steady heating and non-uniform cross-section of the loop along its length, and find that this model can also reproduce the observed DEMs, provided the loop expansion factor {gamma} {approx} 5-10. More observational constraints are required to better understand the nature of coronal heating in the short emerging loops on the quiet Sun.

Chitta, L. P.; Van Ballegooijen, A. A.; DeLuca, E. E. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, MS-15, Cambridge, MA 02138 (United States); Kariyappa, R.; Hasan, S. S. [Indian Institute of Astrophysics, Bangalore 560 034 (India); Hanslmeier, A. [Institut fuer Physik, IGAM, Universitaet Graz, Universitaetsplatz 5, A-8010 Graz (Austria)

2013-05-01T23:59:59.000Z

371

Atmospheric Moisture Budget and Spatial Resolution Dependence of Precipitation Extremes in Aquaplanet Simulations  

SciTech Connect (OSTI)

This study investigates the resolution dependency of precipitation extremes in an aqua-planet framework. Strong resolution dependency of precipitation extremes is seen over both tropics and extra-tropics, and the magnitude of this dependency also varies with dynamical cores. Moisture budget analyses based on aqua-planet simulations with the Community Atmosphere Model (CAM) using the Model for Prediction Across Scales (MPAS) and High Order Method Modeling Environment (HOMME) dynamical cores but the same physics parameterizations suggest that during precipitation extremes moisture supply for surface precipitation is mainly derived from advective moisture convergence. The resolution dependency of precipitation extremes mainly originates from advective moisture transport in the vertical direction. At most vertical levels over the tropics and in the lower atmosphere over the subtropics, the vertical eddy transport of mean moisture field dominates the contribution to precipitation extremes and its resolution dependency. Over the subtropics, the source of moisture, its associated energy, and the resolution dependency during extremes are dominated by eddy transport of eddies moisture at the mid- and upper-troposphere. With both MPAS and HOMME dynamical cores, the resolution dependency of the vertical advective moisture convergence is mainly explained by dynamical changes (related to vertical velocity or omega), although the vertical gradients of moisture act like averaging kernels to determine the sensitivity of the overall resolution dependency to the changes in omega at different vertical levels. The natural reduction of variability with coarser resolution, represented by areal data averaging (aggregation) effect, largely explains the resolution dependency in omega. The thermodynamic changes, which likely result from non-linear feedback in response to the large dynamical changes, are small compared to the overall changes in dynamics (omega). However, after excluding the data aggregation effect in omega, thermodynamic changes become relatively significant in offsetting the effect of dynamics leading to reduce differences between the simulated and aggregated results. Compared to MPAS, the simulated stronger vertical motion with HOMME also results in larger resolution dependency. Compared to the simulation at fine resolution, the vertical motion during extremes is insufficiently resolved/parameterized at the coarser resolution even after accounting for the natural reduction in variability with coarser resolution, and this is more distinct in the simulation with HOMME. To reduce uncertainties in simulated precipitation extremes, future development in cloud parameterizations must address their sensitivity to spatial resolution as well as dynamical cores.

Yang, Qing; Leung, Lai-Yung R.; Rauscher, Sara; Ringler, Todd; Taylor, Mark

2014-05-01T23:59:59.000Z

372

Impact of horizontal resolution on simulation of precipitation extremes in an aqua-planet version of the Community Atmosphere Model (CAM)  

SciTech Connect (OSTI)

One key question regarding current climate models is whether the projection of climate extremes converges to a realistic representation as the spatial and temporal resolutions of the model are increased. Ideally the model extreme statistics should approach a fixed distribution once the resolutions are commensurate with the characteristic length and time scales of the processes governing the formation of the extreme phenomena of interest. In this study, a series of AGCM runs with idealized 'aquaplanet-steady-state' boundary conditions have been performed with the Community Atmosphere Model CAM3 to investigate the effect of horizontal resolution on climate extreme simulations. The use of the aquaplanet framework highlights the roles of model physics and dynamics and removes any apparent convergence in extreme statistics due to better resolution of surface boundary conditions and other external inputs. Assessed at a same large spatial scale, the results show that the horizontal resolution and time step have strong effects on the simulations of precipitation extremes. The horizontal resolution has a much stronger impact on precipitation extremes than on mean precipitation. Updrafts are strongly correlated with extreme precipitation at tropics at all the resolutions, while positive low-tropospheric temperature anomalies are associated with extreme precipitation at mid-latitudes.

Li, F.; Collins, W.D.; Wehner, M.F.; Williamson, D.L.; Olson, J.G.; Algieri, C.

2011-03-01T23:59:59.000Z

373

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

374

Construction of new extremal unimodular lattices Philippe Gaborit \\Lambda  

E-Print Network [OSTI]

Construction of new extremal unimodular lattices Philippe Gaborit \\Lambda July 22, 2003 Abstract In this paper we construct new extremal and optimal unimodular lattices in di­ mensions 36; 38; 42; 45; 52; 54; 60 and 68. We construct them in two ways: first in the case of dimensions congruent to 4 modulo 8

Gaborit, Philippe

375

Extremely local MR representations: Youngmi Hur1 & Amos Ron2  

E-Print Network [OSTI]

Extremely local MR representations: L-CAMP Youngmi Hur1 & Amos Ron2 Workshop on sparse representations: UMD, May 2005 1 Math, UW-Madison 2 CS, UW-Madison #12;Wavelet and framelet constructions History of all local MR representations #12;L-CAMP: Extremely local MR constructions Bird's view of the CAP

Maryland at College Park, University of

376

Extreme Loads for an Offshore Wind Turbine using Statistical  

E-Print Network [OSTI]

Extreme Loads for an Offshore Wind Turbine using Statistical Extrapolation from Limited Field Data,itiscommontoeithercarry out extensive simulation studies or undertake a field measurement campaign. At the Blyth offshore wind here is to estimate extreme loads for an offshore wind turbine for which the environmental and load

Manuel, Lance

377

Origins of the extremely warm European fall of 2006  

E-Print Network [OSTI]

Origins of the extremely warm European fall of 2006 Julien Cattiaux R. Vautard, P. Yiou LSCE ­ IPSL France European Geosciences Union General Assembly 2009 CL1 Session: Climate Extremes and Impacts. #12.Cattiauxetal.,OriginsoftheextremelywarmEuropeanfallof2006 European temperatures and atmospheric circulation #12;The best correlation is found for the V-Wind

Ribes, Aurélien

378

RisR1437(EN) Wind Simulation for Extreme  

E-Print Network [OSTI]

Risø­R­1437(EN) Wind Simulation for Extreme and Fatigue Loads M. Nielsen, G. C. Larsen, J. Mann, S integrity of a wind turbine structure involves analyses of fatigue loading as well as extreme loading University of Denmark, and NEG-Micon A/S, as part of the EFP-2001(Wind) programme sponsored by the Danish

379

Ultraviolet radiation as disinfection for fish surgical tools  

SciTech Connect (OSTI)

Telemetry is frequently used to examine the behavior of fish, and the transmitters used are normally surgically implanted into the coelomic cavity of fish. Implantation requires the use of surgical tools such as scalpels, forceps, needle holders, and sutures. When fish are implanted consecutively, as in 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. To determine the efficacy for this application, ultraviolet (UV) radiation was used to disinfect surgical tools 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, causative agents of furunculosis, coldwater disease, bacterial kidney disease, and saprolegniasis (water mold), respectively. Four experiments were conducted to address the question of UV efficacy. In the first experiment, forceps were exposed to the three bacteria at three varying concentrations. 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. UV radiation exposures at all durations were effective at killing all three bacteria on forceps at the highest bacteria concentrations. In the second experiment, stab scalpels, sutures, and needle holders were exposed to A. salmonicida using the same methodology as used in Experiment 1. UV radiation exposure at 5 and 15 min was effective at killing A. salmonicida on stab scalpels and sutures but not needle holders. In the third experiment, S. parasitica, a water mold, was tested using an agar plate method and forceps-pinch method. UV radiation was effective at killing the water mold at all three exposure durations. Collectively, this study shows that UV radiation appears to provide a quick alternative disinfection technique to chemical disinfectants (e.g., ethanol) for some surgical tools. However, we do not recommend using this method for tools such as needle holders having overlapping parts or other structures that cannot be exposed directly to UV radiation

Walker, Ricardo W.; Markillie, Lye Meng; Colotelo, Alison HA; Geist, David R.; Gay, Marybeth E.; Woodley, Christa M.; Eppard, M. B.; Brown, Richard S.

2013-04-04T23:59:59.000Z

380

Inferring ultraviolet anatomical exposure patterns while distinguishing the relative contribution of radiation components  

SciTech Connect (OSTI)

Exposure to solar ultraviolet (UV) radiation is the main causative factor for skin cancer. UV exposure depends on environmental and individual factors, but individual exposure data remain scarce. While ground UV irradiance is monitored via different techniques, it is difficult to translate such observations into human UV exposure or dose because of confounding factors. A multi-disciplinary collaboration developed a model predicting the dose and distribution of UV exposure on the basis of ground irradiation and morphological data. Standard 3D computer graphics techniques were adapted to develop a simulation tool that estimates solar exposure of a virtual manikin depicted as a triangle mesh surface. The amount of solar energy received by various body locations is computed for direct, diffuse and reflected radiation separately. Dosimetric measurements obtained in field conditions were used to assess the model performance. The model predicted exposure to solar UV adequately with a symmetric mean absolute percentage error of 13% and half of the predictions within 17% range of the measurements. Using this tool, solar UV exposure patterns were investigated with respect to the relative contribution of the direct, diffuse and reflected radiation. Exposure doses for various body parts and exposure scenarios of a standing individual were assessed using erythemally-weighted UV ground irradiance data measured in 2009 at Payerne, Switzerland as input. For most anatomical sites, mean daily doses were high (typically 6.2-14.6 Standard Erythemal Dose, SED) and exceeded recommended exposure values. Direct exposure was important during specific periods (e.g. midday during summer), but contributed moderately to the annual dose, ranging from 15 to 24% for vertical and horizontal body parts, respectively. Diffuse irradiation explained about 80% of the cumulative annual exposure dose.

Vuilleumier, Laurent [Federal Office of Meteorology and Climatology, MeteoSwiss, Payerne (Switzerland); Milon, Antoine; Vernez, David [Institute of Work and Health, University of Lausanne and Geneva, Lausanne (Switzerland); Bulliard, Jean-Luc [Cancer Epidemiology Unit, Centre Hospitalier Universitaire Vaudois and University of Lausanne, Lausanne (Switzerland); Moccozet, Laurent [Institute of Services Science, University of Geneva (Switzerland)

2013-05-10T23:59:59.000Z

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

Extremality of translation-invariant phases for a finite-state SOS-model on the binary tree  

E-Print Network [OSTI]

We consider the SOS (solid-on-solid) model, with spin values $0,1,2$, on the Cayley tree of order two (binary tree). We treat both ferromagnetic and antiferromagnetic coupling, with interactions which are proportional to the absolute value of the spin differences. We present a classification of all translation-invariant phases (splitting Gibbs measures) of the model: We show uniqueness in the case of antiferromagnetic interactions, and existence of up to seven phases in the case of ferromagnetic interactions, where the number of phases depends on the interaction strength. Next we investigate whether these states are extremal or non-extremal in the set of all Gibbs measures, when the coupling strength is varied, whenever they exist. We show that two states are always extremal, two states are always non-extremal, while three of the seven states make transitions between extremality and non-extremality. We provide explicit bounds on those transition values, making use of algebraic properties of the models, and an adaptation of the method of Martinelli, Sinclair, Weitz.

C. Kuelske; U. A. Rozikov

2014-11-21T23:59:59.000Z

382

Nonadiabatic calculations of ultraviolet absorption cross section of sulfur monoxide: Isotopic effects on the photodissociation reaction  

SciTech Connect (OSTI)

Ultraviolet absorption cross sections of the main and substituted sulfur monoxide (SO) isotopologues were calculated using R-Matrix expansion technique. Energies, transition dipole moments, and nonadiabatic coupling matrix elements were calculated at MRCI/AV6Z level. The calculated absorption cross section of {sup 32}S{sup 16}O was compared with experimental spectrum; the spectral feature and the absolute value of photoabsorption cross sections are in good agreement. Our calculation predicts a long lived photoexcited SO* species which causes large non-mass dependent isotopic effects depending on the excitation energy in the ultraviolet region.

Danielache, Sebastian O.; Tomoya, Suzuki; Nanbu, Shinkoh [Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University, Chiyoda Ku, Tokyo 102-8554 (Japan)] [Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University, Chiyoda Ku, Tokyo 102-8554 (Japan); Kondorsky, Alexey [P. N. Lebedev Physical Institute of Russian Academy of Science, Leninsky pr., 53, Moscow, 119991 (Russian Federation) [P. N. Lebedev Physical Institute of Russian Academy of Science, Leninsky pr., 53, Moscow, 119991 (Russian Federation); Moscow Institute of Physics and Technology (State University), Institutsky per., 9, Dolgoprudny Moscow region, 141700 (Russian Federation); Tokue, Ikuo [Department of Chemistry, Faculty of Science, Niigata University, Ikarashi, Niigata 950-2181 (Japan)] [Department of Chemistry, Faculty of Science, Niigata University, Ikarashi, Niigata 950-2181 (Japan)

2014-01-28T23:59:59.000Z

383

Note: Hollow cathode lamp with integral, high optical efficiency isolation valve: A modular vacuum ultraviolet source  

SciTech Connect (OSTI)

The design and operating conditions of a hollow cathode discharge lamp for the generation of vacuum ultraviolet radiation, suitable for ultrahigh vacuum (UHV) application, are described in detail. The design is easily constructed, and modular, allowing it to be adapted to different experimental requirements. A thin isolation valve is built into one of the differential pumping stages, isolating the discharge section from the UHV section, both for vacuum safety and to allow lamp maintenance without venting the UHV chamber. The lamp has been used both for ultraviolet photoelectron spectroscopy of surfaces and as a “soft” photoionization source for gas-phase mass spectrometry.

Sloan Roberts, F.; Anderson, Scott L. [Department of Chemistry, University of Utah, 315 S. 1400 E., Salt Lake City, Utah 84112 (United States)] [Department of Chemistry, University of Utah, 315 S. 1400 E., Salt Lake City, Utah 84112 (United States)

2013-12-15T23:59:59.000Z

384

PART 1 OF TUTORIAL ON EXTREMES TOOLKIT (1) Installation of R software  

E-Print Network [OSTI]

PART 1 OF TUTORIAL ON EXTREMES TOOLKIT (1) Installation of R software R-2.9.2-win32.exe Use default options (2) Installation of Extremes Toolkit extRemes (R package for extreme value analysis): extRemes_1.60.zip ismev (R package used by extRemes): ismev_1.34.zip Lmoments (R package used by extRemes): Lmoments

Katz, Richard

385

Thermodynamics of the Near-Extremal NS5-brane  

E-Print Network [OSTI]

We consider the thermodynamics of the near-extremal NS5-brane in type IIA string theory. The central tool we use is to map phases of six-dimensional Kaluza-Klein black holes to phases of near-extremal M5-branes with a transverse circle in eleven-dimensional supergravity. By S-duality these phases correspond to phases of the near-extremal type IIA NS5-brane. One of our main results is that in the canonical ensemble the usual near-extremal NS5-brane background, dual to a uniformly smeared near-extremal M5-brane, is subdominant to a new background of near-extremal M5-branes localized on the transverse circle. This new stable phase has a limiting temperature, which lies above the Hagedorn temperature of the usual NS5-brane phase. We discuss the limiting temperature and compare the different behavior of the NS5-brane in the canonical and microcanonical ensembles. We also briefly comment on the thermodynamics of near-extremal Dp-branes on a transverse circle.

T. Harmark; N. A. Obers

2005-10-25T23:59:59.000Z

386

Nearly extremal apparent horizons in simulations of merging black holes  

E-Print Network [OSTI]

The spin angular momentum $S$ of an isolated Kerr black hole is bounded by the surface area $A$ of its apparent horizon: $8\\pi S \\le A$, with equality for extremal black holes. In this paper, we explore the extremality of individual and common apparent horizons for merging, rapidly spinning binary black holes. We consider simulations of merging black holes with equal masses $M$ and initial spin angular momenta aligned with the orbital angular momentum, including new simulations with spin magnitudes up to $S/M^2 = 0.994$. We measure the area and (using approximate Killing vectors) the spin on the individual and common apparent horizons, finding that the inequality $8\\pi S extremality by computing the smallest value that Booth and Fairhurst's extremality parameter can take for any scaling. Using this lower bound, we conclude that the common horizons are at least moderately close to extremal just after they appear. Finally, following Lovelace et al. (2008), we construct quasiequilibrium binary-black-hole initial data with "overspun" marginally trapped surfaces with $8\\pi S > A$ and for which our lower bound on their Booth-Fairhurst extremality exceeds unity. These superextremal surfaces are always surrounded by marginally outer trapped surfaces (i.e., by apparent horizons) with $8\\pi Sextremality lower bound on the enclosing apparent horizon is always less than unity but can exceed the value for an extremal Kerr black hole. (Abstract abbreviated.)

Geoffrey Lovelace; Mark A. Scheel; Robert Owen; Matthew Giesler; Reza Katebi; Bela Szilagyi; Tony Chu; Nicholas Demos; Daniel A. Hemberger; Lawrence E. Kidder; Harald P. Pfeiffer; Nousha Afshari

2014-11-26T23:59:59.000Z

387

Studying the Mechanisms of Titanium Dioxide as Ultraviolet-Blocking Additive for Films and Fabrics by an  

E-Print Network [OSTI]

Studying the Mechanisms of Titanium Dioxide as Ultraviolet-Blocking Additive for Films and Fabrics November 2003 ABSTRACT: Titanium dioxide (TiO2) has good ultraviolet (UV)-blocking power and is very: inorganic UV-blocking agents; additives; films; adsorption; light scattering INTRODUCTION More frequent

Pan, Ning

388

Extremal shot noises, heavy tails and max-stable random fields.  

E-Print Network [OSTI]

Extremal shot noises, heavy tails and max-stable random fields. Cl´ement Dombry May 31, 2010 Abstract We consider the extremal shot noise defined by M(y) = sup{mh(y - x); (x, m) }, where. Extremal shot noises naturally appear in extreme value theory as a model for spatial extremes and serve

Paris-Sud XI, Université de

389

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

390

The Argument of an Extremal Dilatation Marvin Ortel; Wayne Smith  

E-Print Network [OSTI]

The Argument of an Extremal Dilatation Marvin Ortel; Wayne Smith Proceedings of the American DILATATION MARVIN ORTEL -4ND WAYNE SMITH (Communicated by Irwin Kra) ABSTRACT.Suppose n is the complex

Smith, Wayne

391

Fitting In: Extreme Corporate Wellness and Organizational Communication  

E-Print Network [OSTI]

, and (3) corporeal ethics. First, organizational culture, including espoused values and shared levels of assumptions, took on certain changes because of an emphasis on extreme fitness. Employee participation in CrossFit led to strict notions of strength...

James, Eric Preston

2014-07-31T23:59:59.000Z

392

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 AAncient Unvierse with Gamma-Ray Bursts, pages 330–333. AIP,

Aune, Taylor

2012-01-01T23:59:59.000Z

393

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...

Odins, Andrew Michael

2005-02-17T23:59:59.000Z

394

Simulation of Two-Dimensional Ultraviolet Spectroscopy of Amyloid Fibrils Darius Abramavicius,  

E-Print Network [OSTI]

diseases. Amyloid fibrils are formed by a wide variety of peptides and proteins and can be distinguishedSimulation of Two-Dimensional Ultraviolet Spectroscopy of Amyloid Fibrils Jun Jiang, Darius, 2010 Revealing the structure and aggregation mechanism of amyloid fibrils is essential

Mukamel, Shaul

395

AMLR program: Ultraviolet and visible solar irradiance around Elephant Island, Antarctica, January to March 1993  

SciTech Connect (OSTI)

Since the discovery of the seasonal ozone hole over Antarctica, great efforts have been made in measuring incident ultraviolet radiation at high latitudes in the Southern Hemisphere, as well as the impact that enhanced UV-B radiation could have on terrestrial and aquatic environments. The measurements described in this article were conducted on board the NOAA ship Surveyor. 3 refs., 3 figs.

Helbling, E.W.; Holm-Hansen, O. (Univ. of California, San Diego, La Jolla, CA (United States)); Moran, P. (Universidad Nacional del Sur, Bahia Blanca (Argentina))

1993-01-01T23:59:59.000Z

396

Characterization and correction of Global Ozone Monitoring Experiment 2 ultraviolet measurements and application  

E-Print Network [OSTI]

analysis indicates that reflectance degradation began at the beginning of the mission; the reflectance degrades by 15% around 290 nm and by 2.2% around 325 nm from 2007 through 2009. Degradation shows of radiance in the ultraviolet (UV) region is essential for retrievals of ozone profiles especially

Chance, Kelly

397

SIDE GROUP ADDITION TO THE POLYCYCLIC AROMATIC HYDROCARBON CORONENE BY ULTRAVIOLET PHOTOLYSIS IN COSMIC ICE ANALOGS  

E-Print Network [OSTI]

- ated aromatics can be produced in D2O ice photolysis experiments under interstellar conditions IN COSMIC ICE ANALOGS Max P. Bernstein,1,2 Jamie E. Elsila,3 Jason P. Dworkin,1,2 Scott A. Sandford,1 Louis Ultraviolet photolysis of various coronene-ice mixtures at low temperature and pressure caused the addi- tion

Zare, Richard N.

398

Signatures of the Protein Folding Pathway in Two-Dimensional Ultraviolet Spectroscopy  

E-Print Network [OSTI]

Signatures of the Protein Folding Pathway in Two-Dimensional Ultraviolet Spectroscopy Jun Jiang of the signals provides a quantitative marker of protein folding status, accessible by both theoretical calculations and experiments. SECTION: Biophysical Chemistry and Biomolecules Protein folding is an important

Mukamel, Shaul

399

Infrared and ultraviolet problem for the Nelson model with variable coefficients  

E-Print Network [OSTI]

Infrared and ultraviolet problem for the Nelson model with variable coefficients C. G´erard,1 , F of the Hamiltonian in the presence of the infrared problem, i.e. assuming that the boson mass tends to 0 at infinity state one usually speaks of the infrared problem or infrared divergence. The infrared problem arises

400

Near-infrared femtosecond laser machining initiated by ultraviolet multiphoton ionization  

E-Print Network [OSTI]

Near-infrared femtosecond laser machining initiated by ultraviolet multiphoton ionization X. Yu, Q://apl.aip.org/features/most_downloaded Information for Authors: http://apl.aip.org/authors #12;Near-infrared femtosecond laser machining initiated, and the near-infrared pulse utilizes these electrons to cause damage by avalanche ionization. VC 2013 American

Van Stryland, Eric

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

Persisting cold extremes under 21st-century warming scenarios  

SciTech Connect (OSTI)

Analyses of climate model simulations and observations reveal that extreme cold events are likely to persist across each land-continent even under 21st-century warming scenarios. The grid-based intensity, duration and frequency of cold extreme events are calculated annually through three indices: the coldest annual consecutive three-day average of daily maximum temperature, the annual maximum of consecutive frost days, and the total number of frost days. Nine global climate models forced with a moderate greenhouse-gas emissions scenario compares the indices over 2091 2100 versus 1991 2000. The credibility of model-simulated cold extremes is evaluated through both bias scores relative to reanalysis data in the past and multi-model agreement in the future. The number of times the value of each annual index in 2091 2100 exceeds the decadal average of the corresponding index in 1991 2000 is counted. The results indicate that intensity and duration of grid-based cold extremes, when viewed as a global total, will often be as severe as current typical conditions in many regions, but the corresponding frequency does not show this persistence. While the models agree on the projected persistence of cold extremes in terms of global counts, regionally, inter-model variability and disparity in model performance tends to dominate. Our findings suggest that, despite a general warming trend, regional preparedness for extreme cold events cannot be compromised even towards the end of the century.

Kodra, Evan A [ORNL; Steinhaeuser, Karsten J K [ORNL; Ganguly, Auroop R [ORNL

2011-01-01T23:59:59.000Z

402

Extremal Three-point Correlators in Kerr/CFT  

E-Print Network [OSTI]

We compute three-point correlation functions in the near-extremal, near-horizon region of a Kerr black hole, and compare to the corresponding finite-temperature conformal field theory correlators. For simplicity, we focus on scalar fields dual to operators ${\\cal O}_h$ whose conformal dimensions obey $h_3=h_1+h_2$, which we name \\emph{extremal} in analogy with the classic $AdS_5 \\times S^5$ three-point function in the literature. For such extremal correlators we find perfect agreement with the conformal field theory side, provided that the coupling of the cubic interaction contains a vanishing prefactor $\\propto h_3-h_1-h_2$. In fact, the bulk three-point function integral for such extremal correlators diverges as $1/(h_3-h_1-h_2)$. This behavior is analogous to what was found in the context of extremal AdS/CFT three-point correlators. As in AdS/CFT our correlation function can nevertheless be computed via analytic continuation from the non-extremal case.

Melanie Becker; Sera Cremonini; Waldemar Schulgin

2010-04-07T23:59:59.000Z

403

Could the Earth's surface Ultraviolet irradiance be blamed for the global warming? (II) ----Ozone layer depth reconstruction via HEWV effect  

E-Print Network [OSTI]

It is suggested by Chen {\\it et al.} that the Earth's surface Ultraviolet irradiance ($280-400$ nm) could influence the Earth's surface temperature variation by "Highly Excited Water Vapor" (HEWV) effect. In this manuscript, we reconstruct the developing history of the ozone layer depth variation from 1860 to 2011 based on the HEWV effect. It is shown that the reconstructed ozone layer depth variation correlates with the observational variation from 1958 to 2005 very well ($R=0.8422$, $P>99.9\\%$). From this reconstruction, we may limit the spectra band of the surface Ultraviolet irradiance referred in HEWV effect to Ultraviolet B ($280-320$ nm).

Chen, Jilong; Zheng, Yujun

2014-01-01T23:59:59.000Z

404

Nearly extremal apparent horizons in simulations of merging black holes  

E-Print Network [OSTI]

The spin angular momentum $S$ of an isolated Kerr black hole is bounded by the surface area $A$ of its apparent horizon: $8\\pi S \\le A$, with equality for extremal black holes. In this paper, we explore the extremality of individual and common apparent horizons for merging, rapidly spinning binary black holes. We consider simulations of merging black holes with equal masses $M$ and initial spin angular momenta aligned with the orbital angular momentum, including new simulations with spin magnitudes up to $S/M^2 = 0.994$. We measure the area and (using approximate Killing vectors) the spin on the individual and common apparent horizons, finding that the inequality $8\\pi S A$ and for which our lower bound on their Booth-Fairhurst extremality exceeds unity. These superextremal surfaces are always surrounded by marginally outer trapped surfaces (i.e., by apparent horizons) with $8\\pi Sextremality lower bound on the enclosing apparent horizon is always less than unity but can exceed the value for an extremal Kerr black hole. (Abstract abbreviated.)

Geoffrey Lovelace; Mark A. Scheel; Robert Owen; Matthew Giesler; Reza Katebi; Bela Szilagyi; Tony Chu; Nicholas Demos; Daniel A. Hemberger; Lawrence E. Kidder; Harald P. Pfeiffer; Nousha Afshari

2015-02-27T23:59:59.000Z

405

Repair of 254 nm ultraviolet-induced (6-4) photoproducts: monoclonal antibody recognition and differential defects in xeroderma pigmentosum complementation groups A, D, and variant  

SciTech Connect (OSTI)

Repair kinetics of ultraviolet (UV) light-induced (6-4) photoproducts in xeroderma pigmentosum complementation group A, D, and variant cells were studied by the enzyme-linked immunosorbent assay (ELISA) using a specific monoclonal antibody raised against (6-4) photoproducts, together with unscheduled DNA synthesis (UDS) and loss of T4 endonuclease V-susceptible sites (ESS). Group AXP35KO cells completely failed to repair both ESS (cyclobutane pyrimidine dimers) and antibody-recognizing (6-4) photoproducts until tested 24 h after irradiation, and had 2% early-time UDS. Group DXP43KO cells showed about 10% removal of both (6-4) photoproducts and ESS in 24 h, despite showing a residually higher level of 40% early-time and cumulative UDS. Thus, the results substantiated the extreme UV hypersensitivity of XP group A and D cells. However, XP52KO variant cells exhibited the normal level of UDS and ESS loss, but a slightly reduced repair of antibody-recognizing (6-4) photoproducts at 6 and 12 h after irradiation, which may account for a small UV hypersensitivity of the XP variant cells.

Hiramoto, T.; Matsunaga, T.; Ichihashi, M.; Nikaido, O.; Fujiwara, Y.; Mishima, Y. (Kobe Univ. (Japan))

1989-11-01T23:59:59.000Z

406

Intensification of hot extremes in the United States  

SciTech Connect (OSTI)

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

407

From Extreme Values of I.I.D. Random Fields to Extreme Eigenvalues of Finite-volume Anderson Hamiltonian  

E-Print Network [OSTI]

The aim of this paper is to study asymptotic geometric properties almost surely or/and in probability of extreme order statistics of an i.i.d. random field (potential) indexed by sites of multidimensional lattice cube, the volume of which unboundedly increases. We discuss the following topics: (I) high level exceedances, in particular, clustering of exceedances; (II) decay rate of spacings in comparison with increasing rate of extreme order statistics; (III) minimum of spacings of successive order statistics; (IV) asymptotic behavior of values neighboring to extremes and so on. The conditions of the results are formulated in terms of regular variation (RV) of the cumulative hazard function and its inverse. A relationship between RV classes of the present paper as well as their links to the well-known RV classes (including domains of attraction of max-stable distributions) are discussed. The asymptotic behavior of functionals (I)--(IV) determines the asymptotic structure of the top eigenvalues and the corresponding eigenfunctions of the large-volume discrete Schr\\" odinger operators with an i.i.d. potential (Anderson Hamiltonian). Thus, another aim of the present paper is to review and comment a recent progress on extreme value theory for eigenvalues of random Schr\\"odinger operators as well as to provide a clear and rigorous understanding of the relationship between the top eigenvalues and extreme values of i.i.d. potentials.

Arvydas Astrauskas

2015-01-05T23:59:59.000Z

408

Climate, extreme heat, and electricity demand in California  

SciTech Connect (OSTI)

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

409

Semiclassical Decay of Near-Extremal Black Holes  

E-Print Network [OSTI]

Decay of a near-extremal black hole down to the extremal state is studied in the background field approximation to determine the fate of injected matter and Hawking pairs. By examining the behavior of light rays and solutions to the wave equation it is concluded that the singularity at the origin is irrelevant. Furthermore, there is most likely an instability of the event horizon arising from the accumulation of injected matter and Hawking partners there. The possible role of this instability in reconciling the D-brane and black hole pictures of the decay process is discussed.

Ted Jacobson

1998-03-26T23:59:59.000Z

410

Extreme high-head portables provide more pumping options  

SciTech Connect (OSTI)

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

411

Absorption of scalars by extremal black holes in string theory  

E-Print Network [OSTI]

We show that the low frequency absorption cross section of minimally coupled massless scalar fields by extremal spherically symmetric black holes in d dimensions in the presence of string-theoretical alpha' corrections is equal to the horizon area. Classically one has the relation sigma=4GS between the absorption cross section and the black hole entropy. We discuss the validity of such relation in the presence of alpha' corrections for extremal black holes, both nonsupersymmetric and supersymmetric. The examples we consider seem to indicate that this relation is verified in the presence of alpha' corrections for supersymmetric black holes, but not for nonsupersymmetric ones.

Filipe Moura

2014-06-13T23:59:59.000Z

412

TECA: A Parallel Toolkit for Extreme Climate Analysis  

SciTech Connect (OSTI)

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

413

Quality and Sensory Attributes of Shell Eggs Sanitized with a Combination of Hydrogen Peroxide and Ultraviolet Light  

E-Print Network [OSTI]

Two experiments were conducted to evaluate the combination of hydrogen peroxide (H2O2) and ultraviolet light (UV) as an alternative eggshell sanitization procedure for shell egg processing. In each experiment, two cases of eggs (720 total) were...

Woodring, Kristy Senise

2011-10-21T23:59:59.000Z

414

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

SciTech Connect (OSTI)

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

415

The ultraviolet spectra of SO?¹? and SO?¹? near 2300 A  

E-Print Network [OSTI]

Vibrational Notation So So Shift Assignment Rigg's Kim's (cm ) (cm ) T2 43512. 8 Tl Y4 43539. 2 43528. 5 S1. 3 43703. 9 T4 H3 43398. 2 43396. 2 (AG cm ) + 2. 0 +10. 7 I ( UI 'c2 D3 ) (110 ) (011 ) (100 ) (030 ) e (l&1u2 n3 ) (010) (ooo) (ooo.... 2 46707. 1 46800 46818. 3 Jl N3 46867. 3 46720. 7 146. 6 I3 I2 H3 H2 IIY2 47055 47197. 3 47224. 5 47073. 6 150. 9 47247. 5 47547. 6 47575 3 Hl IYI 47622. 5 47448. 7 20 Edlen (10) ~ The bands measured in this investigation are all...

Kim, Sang Uk

1966-01-01T23:59:59.000Z

416

The effects of selected wavelengths and energy levels of ultraviolet irradiation on the endopeptidase and hemolytic activity of Aeromonas proteolytica  

E-Print Network [OSTI]

irradiation of the radiosensitive B strain of Escherichia cali induced, at a high frequency, a radiation resistance strain, which she designated as B/r. Six years later Clark (2) found that this B/r strain was not only more resistant to ultraviolet...THE EFFECTS OF SELECTED WAVELENGTHS AND ENERGY LEVELS OF ULTRAVIOLET IRRADIATION ON THE ENDOPEPTIDASE AND HEMOLYTIC ACTIVITY OF AEROMONAS PROTEOLYTICA A Thesis by DAVID FRANKLIN LOVETT Submitted to the Graduate College of Texas ASM...

Lovett, David Franklin

1972-01-01T23:59:59.000Z

417

Ultraviolet spectrophotometry of close binary systems: CV Velorum, RS Vulpeculae and DH Cephei  

SciTech Connect (OSTI)

The ultraviolet magnitudes of CV Velorum, RS Vulpeculae and DH Cephei are reported. Aside from twenty observations of CV Velorum which fell inside the primary eclipse, all data were obtained for phases outside eclipse. Observations were made with the University of Greningen experiment on board the Astronomical Netherlands Satellite. The instrument consists of a 22 cm aperture Cassegrain telescope followed by a five channel grating spectrophotometer. Instrument operation modes and data correction procedures are briefly described.

Wu, C.C.; Eaton, J.A.

1981-01-01T23:59:59.000Z

418

Proliferative and toxic effects of ultraviolet light and inflammation on epidermal pigment cells  

SciTech Connect (OSTI)

The ear of the mouse is useful for studying the effects of ultraviolet light on epidermal pigment cells. The quantity of light penetrating into the skin causing an inflammatory response can be assessed easily by measuring with an engineering calipers the swelling of the ear. The inflammatory response of the ear exhibits a linear relationship to the dose of light delivered. We observed that doses of shortwave ultraviolet light which are noninflammatory when repeated at daily intervals induce moderate to severe inflammation. Small doses of psoralen and prolonged exposure to UVA (PUVA) were more inflammatory than larger amounts of psoralen and short exposure to light. Doses of shortwave ultraviolet light and PUVA which produce only a minimal inflammation of the skin stimulate the proliferation of epidermal melanocytes. In contrast, PUVA in doses sufficiently large to cause a marked inflammatory reaction in the skin seems injurious to pigment cells and kills them or causes only a minimal proliferative response. The inflammatory reaction itself does not seem to stimulate or inhibit the proliferation of melanocytes. Prostaglandins A, E, and F2 alpha have no effect on the proliferation of epidermal pigment cells. In contrast, dimethyl sulfoxide (DMSO) and allergic contact dermatitis increase the numerical density of pigment cells. Steroids may block the function of the enzyme tyrosinase. Our experiments indicate that pigment cells, like many other varieties of cells, are susceptible to injury and can be killed at least by large doses of PUVA.

Nordlund, J.J.; Ackles, A.E.; Traynor, F.F.

1981-10-01T23:59:59.000Z

419

The Diverse Properties of the Most Ultraviolet Luminous Galaxies Discovered by the Galaxy Evolution Explorer  

E-Print Network [OSTI]

We report on the properties of a sample of ultraviolet luminous galaxies (UVLGs) selected by matching the Galaxy Evolution Explorer (GALEX) Surveys with the Sloan Digital Sky Survey Third Data Release. Out of 25362 galaxies between 0.02x10^10 L_solar at 1530 Angstroms (observed wavelength). The properties of this population are well correlated with ultraviolet surface brightness. We find that the galaxies with low UV surface brightness are primarily large spiral systems with a mixture of old and young stellar populations, while the high surface brightness galaxies consist primarily of compact starburst systems. In terms of the behavior of surface brightness with luminosity, size with luminosity, the mass-metallicity relation, and other parameters, the compact UVLGs clearly depart from the trends established by the full sample of galaxies. The subset of compact UVLGs with the highest surface brightness (``supercompact UVLGs'') have characteristics that are remarkably similar to Lyman Break Galaxies at higher redshift. They are much more luminous than typical local ultraviolet-bright starburst galaxies and blue compact dwarf galaxies. They have metallicities that are systematically lower than normal galaxies of the same stellar mass, indicating that they are less chemically evolved. In all these respects, they are the best local analogs for Lyman Break Galaxies.

Charles G. Hoopes; Timothy M. Heckman; Samir Salim; Mark Seibert; Christy A. Tremonti; David Schiminovich; R. Michael Rich; D. Christopher Martin; Stephane Charlot; Guinevere Kauffmann; Karl Forster; Peter G. Friedman; Patrick Morrissey; Susan G. Neff; Todd Small; Ted K. Wyder; Luciana Bianchi; Jose Donas; Young-Wook Lee; Barry F. Madore; Bruno Milliard; Alex S. Szalay; Barry Y. Welsh; Sukyoung K. Yi

2007-10-23T23:59:59.000Z

420

Influence of Modes of Climate Variability on Global Temperature Extremes JESSE KENYON  

E-Print Network [OSTI]

Influence of Modes of Climate Variability on Global Temperature Extremes JESSE KENYON Nicholas variability on worldwide summer and winter temperature extremes has been analyzed, namely, that of the El Niño for temperature extremes from world- wide land areas are used describe moderate extremes, such as the number

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

Extremes (2010) 13:205217 DOI 10.1007/s10687-010-0105-7  

E-Print Network [OSTI]

Extremes (2010) 13:205­217 DOI 10.1007/s10687-010-0105-7 Sources of uncertainty in the extreme in the calculation of extreme value statistics for observed and modeled climate data. Inter-model differences in the CMIP3 dataset. Keywords Extreme temperature · Return value · Uncertainty · Climate models AMS 2000

422

STATISTICAL METHODS FOR RELATING TEMPERATURE EXTREMES TO LARGE-SCALE METEOROLOGICAL PATTERNS  

E-Print Network [OSTI]

1 STATISTICAL METHODS FOR RELATING TEMPERATURE EXTREMES TO LARGE-SCALE METEOROLOGICAL PATTERNS Rick Extreme Value Analysis: Block Maxima (3) Conditional Extreme Value Analysis: Peaks over Threshold (4) Application to California Temperature Extremes (5) Remaining Work #12;3 #12;4 #12;5 (1) Introduction

Katz, Richard

423

Detection of changes in temperature extremes during the second half of the 20th century  

E-Print Network [OSTI]

Detection of changes in temperature extremes during the second half of the 20th century Nikolaos in extremely warm nights. Human influence on cold nights and days is also detected, although less robustly, but there is no detection of a significant human influence on extremely warm days. In the future, extreme temperatures

424

CONDITIONAL EXTREMES FROM HEAVY-TAILED DISTRIBUTIONS: AN APPLICATION TO THE ESTIMATION  

E-Print Network [OSTI]

CONDITIONAL EXTREMES FROM HEAVY-TAILED DISTRIBUTIONS: AN APPLICATION TO THE ESTIMATION OF EXTREME author, Stephane.Girard@inrialpes.fr Abstract - This paper is dedicated to the estimation of extreme on a simulation study. An application to the estimation of pointwise return levels of extreme rainfalls in the C

Paris-Sud XI, Université de

425

The effect of climate change on extreme waves in the North Sea  

E-Print Network [OSTI]

#12;Results Extreme wind climate NCK days 18 March 2011 Renske de Winter Difference in wind speeds Sea #12;Results Extreme wind climate Winds exceeding 8 Bf (17 m/s) Means over all ESSENCE members of climate change. The are minor changes in the extreme wind climate Extreme wave heights probably do

Vries, Hans de

426

Report on the `Aha Huliko'a workshop on extreme events  

E-Print Network [OSTI]

talked about my work on extreme wind events in GCMs ­ My main contributions: · Asking when GCMs: Extreme wind events · Extreme windstorm Kyrill (18-19 January 2007) ­ Wind gusts up to 134 mph (216 kphReport on the `Aha Huliko'a workshop on extreme events Held 23-26 January 2007, Honolulu, HI Jeff

Gilleland, Eric

427

Causal Analysis of the Unanticipated Extremity Exposure at HFEF  

SciTech Connect (OSTI)

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

428

EXTREMAL CONFIGURATIONS OF ROBOT ARMS IN THREE DIMENSIONS  

E-Print Network [OSTI]

EXTREMAL CONFIGURATIONS OF ROBOT ARMS IN THREE DIMENSIONS DIRK SIERSMA Abstract. We define a volume function for a robot arm in R3 and give geometric conditions for its critical points. 1. Introduction configurations of planar polygonal linkages and open robot arms considered as the critical points of the oriented

Siersma, Dirk

429

INHIBITION OF PHOTOSYNTHESIS IN CERTAIN ALGAE BY EXTREME RED LIGHT  

E-Print Network [OSTI]

INHIBITION OF PHOTOSYNTHESIS IN CERTAIN ALGAE BY EXTREME RED LIGHT GOVINDJEE, EUGENE RABINOWITCH. INTRODUCTION It was shown in preceding papers (9, 10) that when the unicellular red alga Por- phyridium), these algae, when exposed to monochromatic light (bands isolated by a grating monochromator, band half

Govindjee

430

How Climate Change is Playing Out in Minnesota: Extreme Weather  

E-Print Network [OSTI]

How Climate Change is Playing Out in Minnesota: Extreme Weather Dr. Mark Seeley Dept of Soil, Water Climate Headlines Data Sources Changing Minnesota Climate Features Climate Consequences Implications for Severe Weather #12;Three Reasons to Accept That Climate Change is Real #12;#12;Stationary (1) Cyclical (2

Minnesota, University of

431

Measuring Thermal Transport in Extreme Environments: Thermal Conductivity  

E-Print Network [OSTI]

Chen California Institute of Technology Jackie Li University of Michigan supported by CarnegieMeasuring Thermal Transport in Extreme Environments: Thermal Conductivity of Water Ice VII to 20 GPa David G. Cahill, Wen-Pin Hsieh, Dallas Trinkle, University of Illinois at Urbana-Champaign Bin

Braun, Paul

432

Hamilton cycles in graphs and hypergraphs: an extremal perspective  

E-Print Network [OSTI]

Hamilton cycles in graphs and hypergraphs: an extremal perspective Abstract. As one of the most fundamental and well-known NP-complete problems, the Hamilton cycle problem has been the subject of intensive and the study of Hamilton cycles in hypergraphs. We survey these developments and highlight open problems

Osthus, Deryk

433

HAMILTON CYCLES IN GRAPHS AND HYPERGRAPHS: AN EXTREMAL PERSPECTIVE  

E-Print Network [OSTI]

HAMILTON CYCLES IN GRAPHS AND HYPERGRAPHS: AN EXTREMAL PERSPECTIVE DANIELA K¨UHN AND DERYK OSTHUS Abstract. As one of the most fundamental and well-known NP-complete problems, the Hamilton cycle problem emerged, such as resilience, robustness and the study of Hamilton cycles in hypergraphs. We survey

Osthus, Deryk

434

HAMILTON CYCLES IN GRAPHS AND HYPERGRAPHS: AN EXTREMAL PERSPECTIVE  

E-Print Network [OSTI]

HAMILTON CYCLES IN GRAPHS AND HYPERGRAPHS: AN EXTREMAL PERSPECTIVE DANIELA K¨UHN AND DERYK OSTHUS Abstract. As one of the most fundamental and well-known NP-complete prob- lems, the Hamilton cycle problem emerged, such as resilience, robustness and the study of Hamilton cycles in hypergraphs. We survey

Osthus, Deryk

435

An extreme cytoplasmic bottleneck in the modern European cultivated potato  

E-Print Network [OSTI]

An extreme cytoplasmic bottleneck in the modern European cultivated potato (Solanum tuberosum and nuclear diversity in the gene pool of the European cultivated potato (Solanum tuberosum ssp. tuberosum to amplify polymorphic products in a range of potato cultivars. Combining the data from seven polymorphic cp

Provan, Jim

436

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

437

FRONTIER SYNCHROTRON INFRARED SPECTROSCOPY BEAMLINE UNDER EXTREME CONDITIONS (FIS)  

E-Print Network [OSTI]

FRONTIER SYNCHROTRON INFRARED SPECTROSCOPY BEAMLINE UNDER EXTREME CONDITIONS (FIS) Proposal Team: L INFORMATION · TECHNIQUE(S): Fourier transform infrared spectroscopy; Raman and visible spectroscopy; Diamond techniques combined with DACs; Laser heating techniques combined with DACs. · SOURCE: Large-gap (90 mm

Ohta, Shigemi

438

Quantum Chromodynamics and Nuclear Physics at Extreme Energy Density  

SciTech Connect (OSTI)

The report describes research in theoretical quantum chromodynamics, including effective field theories of hadronic interactions, properties of strongly interacting matter at extreme energy density, phenomenology of relativistic heavy ion collisions, and algorithms and numerical simulations of lattice gauge theory and other many-body systems.

Mueller, B.; Bass, S.A.; Chandrasekharan, S.; Mehen, T.; Springer, R.P.

2005-11-07T23:59:59.000Z

439

REVIEW Open Access Climate change, air pollution and extreme events  

E-Print Network [OSTI]

REVIEW Open Access Climate change, air pollution and extreme events leading to increasing dramatically during the past few decades not only in industrialized countries. Urban air pollution from motor be explained only in changes occurred in the environment. Despite some differences in the air pollution profile

440

Extreme conditions during multibubble cavitation: Sonoluminescence as a spectroscopic probe  

E-Print Network [OSTI]

Extreme conditions during multibubble cavitation: Sonoluminescence as a spectroscopic probe Kenneth Cavitation MBSL Plasma a b s t r a c t We review recent work on the use of sonoluminescence (SL) to probe spectroscopically the conditions created during cavitation, both in clouds of collapsing bubbles (multibubble

Suslick, Kenneth S.

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

Extreme Methane Emissions from a Swiss Hydropower Reservoir  

E-Print Network [OSTI]

Extreme Methane Emissions from a Swiss Hydropower Reservoir: Contribution from Bubbling Sediments manuscript received February 3, 2010. Accepted February 15, 2010. Methane emission pathways.Methanediffusionfromthesediment was generally low and seasonally stable and did not account for the high concentration of dissolved methane

Wehrli, Bernhard

442

Improving Societal Outcomes of Extreme Weather in a  

E-Print Network [OSTI]

of carbon dioxide and other greenhouse gases Adaptation: long-term or fundamental changes people make Despite hazard mitigation efforts and scientific and technological ad- vances, extreme weather events and ad- dressing local causes of harm through participatory, community-based efforts formulated within

Neff, Jason

443

Instabilities of (near) extremal rotating black holes in higher dimensions  

E-Print Network [OSTI]

Recently, Durkee and Reall have conjectured a criterion for linear instability of rotating, extremal, asymptotically Minkowskian black holes in $d\\ge 4$ dimensions, such as the Myers-Perry black holes. They considered a certain elliptic operator, $\\cal A$, acting on symmetric traceless tensors intrinsic to the horizon. Based in part on numerical evidence, they suggested that if the lowest eigenvalue, $\\lambda$, of this operator is less than the critical value $-1/4$ ( called "effective BF-bound"), then the black hole is linearly unstable. In this paper, we prove their conjecture. Our proof uses a combination of methods such as (i) the "canonical energy method" of Hollands-Wald, (ii) algebraically special properties of the near horizon geometries associated with the black hole, and (iii) the structure of the (linearized) constraint equations. Our method of proof is also applicable to rotating, extremal asymptotically Anti-deSitter black holes. In that case, our methods show that "all" such black holes are unstable. Although we explicitly discuss in this paper only extremal black holes, we argue that our methods can be generalized straightforwardly to obtain the same results for "near" extremal black holes.

Stefan Hollands; Akihiro Ishibashi

2014-08-04T23:59:59.000Z

444

The Galaxy Evolution Explorer: A Space Ultraviolet Survey Mission  

E-Print Network [OSTI]

We give an overview of the Galaxy Evolution Explorer (GALEX), a NASA Explorer Mission launched on April 28, 2003. GALEX is performing the first space UV sky-survey, including imaging and grism surveys in two bands (1350-1750 Angstroms and 1750-2750 Angstroms). The surveys include an all-sky imaging survey (m[AB] ~ 20.5), a medium imaging survey of 1000 square degrees (m[AB] ~ 23), a deep imaging survey of 100 square degrees (m[AB] ~ 25), and a nearby galaxy survey. Spectroscopic grism surveys (R=100-200) are underway with various depths and sky coverage. Many targets overlap existing or planned surveys. We will use the measured UV properties of local galaxies, along with corollary observations, to calibrate the UV-global star formation rate relationship in local galaxies. We will apply this calibration to distant galaxies discovered in the deep imaging and spectroscopic surveys to map the history of star formation in the universe over the redshift range 0 < z < 1.5, and probe the physical drivers of star formation in galaxies. The GALEX mission includes a Guest Investigator program supporting the wide variety of programs made possible by the first UV sky survey.

D. Christopher Martin; James Fanson; David Schiminovich; Patrick Morrissey; Peter G. Friedman; Tom A. Barlow; Tim Conrow; Robert Grange; Patrick N. Jelinsky; Bruno Milliard; Oswald H. W. Siegmund; Luciana Bianchi; Yong-Ik Byun; Jose Donas; Karl Forster; Timothy M. Heckman; Young-Wook Lee; Barry F. Madore; Roger F. Malina; Susan G. Neff; R. Michael Rich; Todd Small; Alex S. Szalay; Ted K. Wyder

2004-11-11T23:59:59.000Z

445

Recent years have witnessed a vigorous growth in the use of Extreme Value Theory and Statistics of Extremes, with relevance to applications in a broad  

E-Print Network [OSTI]

FOREWORD Recent years have witnessed a vigorous growth in the use of Extreme Value Theory and Statistics of Extremes, with relevance to applications in a broad spectrum of areas, ranging for example from, through recent advances in the field. Statistics of Extremes and Related Fields consists of six articles

Alves, Maria Isabel Fraga

446

Published in Proceedings of the XL2003 (Response of Structures to Extreme Loading) Conference, Toronto, August 2003. EFFICIENT MODELS FOR WIND TURBINE EXTREME LOADS  

E-Print Network [OSTI]

, Toronto, August 2003. EFFICIENT MODELS FOR WIND TURBINE EXTREME LOADS USING INVERSE RELIABILITY K, USA ABSTRACT The reliability of wind turbines against extreme loads is the focus of this study of randomness in the gross wind environment as well as in the extreme response given wind conditions. A detailed

Manuel, Lance

447

Project title: Principal Investigator(s)  

E-Print Network [OSTI]

No. 0123 Project title: Principal Investigator(s): Funding Agency: Submission deadline: Instruments, redeployment costs) OBS engineering and technical support cost: (on shore and at sea) Shipping: Travel and technical support for OBS operations at sea. The cost of providing this support (e.g., instrument charges

Menke, William

448

Investigating Iron Ions | EMSL  

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

Investigating Iron Ions Investigating Iron Ions Computer code provides detailed predictions of highly charged ions in water Using resources at EMSL, scientists obtained...

449

Science at the Theatre - Extreme Science - Promo Video  

ScienceCinema (OSTI)

On Feb. 27 at 7 pm at the Berkeley Repertory Theatre, join four Berkeley Lab scientists as they discuss extreme science -- and what it means to you. Topics include: Neutrino hunting in Antarctica. Learn why Spencer Klein goes to the ends of the Earth to search for these ghostly particles. From Chernobyl to Central Asia, Tamas Torok travels the globe to study microbial diversity in extreme environments. Andrew Minor uses the world's most advanced electron microscopes to explore materials at ultrahigh stresses and in harsh environments. And microbes that talk to computers? Caroline Ajo-Franklin is pioneering cellular-electrical connections that could help transform sunlight into fuel. Go here for more information and to view videos of previous Science at the Theater events: http://www.lbl.gov/LBL-PID/fobl/

Klein, Spencer

2013-05-29T23:59:59.000Z

450

Structure of nuclei at extreme values of the isospin  

E-Print Network [OSTI]

Physics of nuclei at extreme values of the isospin is at the focus of present-day nuclear science. Experimentally, thanks to existing and emerging radioactive-ion-beam facilities, we are on the verge of invading the territory of extreme N/Z ratios in an unprecedented way. Theoretically, nuclear exotica represent a formidable challenge for the nuclear many-body theories and their power to predict nuclear properties far from stability. Going to the limits of the nuclear binding is also important for an improvement of our description of normal nuclei from the neighborhood of the beta stability valley. In the present talk, we review several aspects of the present-day mean-field theoretical studies of weakly bound nuclei.

J. Dobaczewski

1999-01-14T23:59:59.000Z

451

Science at the Theatre - Extreme Science - Promo Video  

SciTech Connect (OSTI)

On Feb. 27 at 7 pm at the Berkeley Repertory Theatre, join four Berkeley Lab scientists as they discuss extreme science -- and what it means to you. Topics include: Neutrino hunting in Antarctica. Learn why Spencer Klein goes to the ends of the Earth to search for these ghostly particles. From Chernobyl to Central Asia, Tamas Torok travels the globe to study microbial diversity in extreme environments. Andrew Minor uses the world's most advanced electron microscopes to explore materials at ultrahigh stresses and in harsh environments. And microbes that talk to computers? Caroline Ajo-Franklin is pioneering cellular-electrical connections that could help transform sunlight into fuel. Go here for more information and to view videos of previous Science at the Theater events: http://www.lbl.gov/LBL-PID/fobl/

Klein, Spencer

2012-01-01T23:59:59.000Z

452

Improved methods for simulating nearly extremal binary black holes  

E-Print Network [OSTI]

Astrophysical black holes could be nearly extremal (that is, rotating nearly as fast as possible); therefore, nearly extremal black holes could be among the binaries that current and future gravitational-wave observatories will detect. Predicting the gravitational waves emitted by merging black holes requires numerical-relativity simulations, but these simulations are especially challenging when one or both holes have mass $m$ and spin $S$ exceeding the Bowen-York limit of $S/m^2=0.93$. We present improved methods that enable us to simulate merging, nearly extremal black holes more robustly and more efficiently. We use these methods to simulate an unequal-mass, precessing binary black hole coalescence, where the larger black hole has $S/m^2=0.99$. We also use these methods to simulate a non-precessing binary black hole coalescence, where both black holes have $S/m^2=0.994$, nearly reaching the Novikov-Thorne upper bound for holes spun up by thin accretion disks. We demonstrate numerical convergence and estimate the numerical errors of the waveforms; we compare numerical waveforms from our simulations with post-Newtonian and effective-one-body waveforms; we compare the evolution of the black-hole masses and spins with analytic predictions; and we explore the effect of increasing spin magnitude on the orbital dynamics (the so-called "orbital hangup" effect).

Mark A. Scheel; Matthew Giesler; Daniel A. Hemberger; Geoffrey Lovelace; Kevin Kuper; Michael Boyle; Bela Szilagyi; Lawrence E. Kidder

2014-12-04T23:59:59.000Z

453

Simulating merging binary black holes with nearly extremal spins  

SciTech Connect (OSTI)

Astrophysically realistic black holes may have spins that are nearly extremal (i.e., close to 1 in dimensionless units). Numerical simulations of binary black holes are important tools both for calibrating analytical templates for gravitational-wave detection and for exploring the nonlinear dynamics of curved spacetime. However, all previous simulations of binary-black-hole inspiral, merger, and ringdown have been limited by an apparently insurmountable barrier: the merging holes' spins could not exceed 0.93, which is still a long way from the maximum possible value in terms of the physical effects of the spin. In this paper, we surpass this limit for the first time, opening the way to explore numerically the behavior of merging, nearly extremal black holes. Specifically, using an improved initial-data method suitable for binary black holes with nearly extremal spins, we simulate the inspiral (through 12.5 orbits), merger and ringdown of two equal-mass black holes with equal spins of magnitude 0.95 antialigned with the orbital angular momentum.

Lovelace, Geoffrey [Center for Radiophysics and Space Research, Cornell University, Ithaca, New York, 14853 (United States); Scheel, Mark A.; Szilagyi, Bela [Theoretical Astrophysics 350-17, California Institute of Technology, Pasadena, California 91125 (United States)

2011-01-15T23:59:59.000Z

454

GALEX Ultraviolet Photometry of Globular Clusters in M31: Three Year Results and a Catalog  

E-Print Network [OSTI]

We present ultraviolet (UV) photometry of M31 globular clusters (GCs) found in 23 Galaxy Evolution Explorer (GALEX) images covering the entirety of M31. We detect 485 and 273 GCs (and GC candidates) in the near-ultraviolet (NUV; 2267 A) and far-ultraviolet (FUV; 1516 A), respectively. Comparing M31 data with those of Galactic GCs in the UV with the aid of population models, we find that the age ranges of old GCs in M31 and the Galactic halo are similar. Three metal-rich ([Fe/H]>-1) GCs in M31 produce significant FUV flux making their FUV-V colors unusually blue for their metallicities. These are thought to be analogs of the two peculiar Galactic GCs NGC 6388 and NGC 6441 with extended blue HB stars. Based on the models incorporating helium enriched subpopulations in addition to the majority of the population that have a normal helium abundance, we suggest that even small fraction of super-helium-rich subpopulations in GCs can reproduce the observed UV bright metal-rich GCs. Young clusters in M31 show distinct UV and optical properties from GCs in Milky Way. Population models indicate that their typical age is less than ~ 2 Gyrs. A large fraction of young GCs have the kinematics of the thin, rapidly rotating disk component. However, a subset of the old GCs also shares the thin-disk kinematics of the younger clusters. The existence of young GCs on the outskirts of M31 disk suggests the occurrence of a significant recent star formation in the thin-disk of M31. Old thin-disk GCs may set constraints on the epoch of early formation of the M31 thin-disk. We detect 12 (10) intermediate-age GC candidates in NUV (FUV). We suggest that some of spectroscopically identified intermediate-age GCs may not be truly intermediate in age, but rather older GCs that possess developed HB.

Soo-Chang Rey; R. Michael Rich; Sangmo T. Sohn; Suk-Jin Yoon; Chul Chung; Sukyoung K. Yi; Young-Wook Lee; Jaehyon Rhee; Luciana Bianchi; Barry F. Madore; Kyungsook Lee; Tom A. Barlow; Karl Forster; Peter G. Friedman; D. Christopher Martin; Patrick Morrissey; Susan G. Neff; David Schiminovich; Mark Seibert; Todd Small; Ted K. Wyder; Jose Donas; Timothy M. Heckman; Bruno Milliard; Alex S. Szalay; Barry Y. Welsh

2006-12-08T23:59:59.000Z

455

Random quasi-phase-matched nonlinear optical conversion of supercontinuum to the ultraviolet  

SciTech Connect (OSTI)

Conversion of fs supercontinuum to the ultraviolet (UV) range from 260 to 305?nm in nonlinear photonic crystal of strontium tetraborate is obtained. Spectral shape of generated UV radiation is governed by the shape of supercontinuum spectrum, focusing conditions and phase mismatch in the material of nonlinear photonic crystal. Maximum integral UV power of 2.6??W was obtained in the case of weaker focusing, and peaks with the spectral width 1–3?nm dominate in the spectrum. Using tight focusing, broadband radiation in the range 265–300?nm was obtained.

Aleksandrovsky, A. S., E-mail: aleksandrovsky@kirensky.ru; Vyunishev, A. M.; Zaitsev, A. I. [L.V.Kirensky Institute of Physics, 660036 Krasnoyarsk (Russian Federation) [L.V.Kirensky Institute of Physics, 660036 Krasnoyarsk (Russian Federation); Siberian Federal University, 660079 Krasnoyarsk (Russian Federation); Slabko, V. V. [Siberian Federal University, 660079 Krasnoyarsk (Russian Federation)] [Siberian Federal University, 660079 Krasnoyarsk (Russian Federation)

2013-12-16T23:59:59.000Z

456

Construction and characterization of ultraviolet acousto-optic based femtosecond pulse shapers  

SciTech Connect (OSTI)

We present all the information necessary for construction and characterization of acousto optic pulse shapers, with a focus on ultraviolet wavelengths, Various radio-frequency drive configurations are presented to allow optimization via knowledgeable trade-off of design features. Detailed performance characteristics of a 267 nm acousto-optic modulator (AOM) based pulse shaper are presented, Practical considerations for AOM based pulse shaping of ultra-broad bandwidth (sub-10 fs) amplified femtosecond pulse shaping are described, with particular attention paid to the effects of the RF frequency bandwidth and optical frequency bandwidth on the spatial dispersion of the output laser pulses.

Mcgrane, Shawn D [Los Alamos National Laboratory; Moore, David S [Los Alamos National Laboratory; Greenfield, Margo T [Los Alamos National Laboratory

2008-01-01T23:59:59.000Z

457

Infrared and Ultraviolet QCD dynamics with quark mass for J=0,1 mesons  

E-Print Network [OSTI]

By using a previously developed phenomenological kernel for the study of the light quark QCD sector and dynamical chiral symmetry breaking effects we will examine the relative infrared and ultraviolet QCD dynamics for J=0,1 meson properties. For the same reasons we extend and explore a quark mass depended generalization of the kernel in the heavy quark region and we also compare with the original model. The relation between the dynamics of the quark propagator and the effective kernel with the J=0,1 QQ and qQ mesons and quarks Compton size is also discussed.

Nicholas Souchlas

2010-06-04T23:59:59.000Z

458

Cooperative effect of ultraviolet and near-infrared beams in laser-induced condensation  

SciTech Connect (OSTI)

We demonstrate the cooperative effect of near infrared (NIR) and ultraviolet (UV) beams on laser-induced condensation. Launching a UV laser after a NIR pulse yields up to a 5-fold increase in the production of nanoparticles (25–300 nm) as compared to a single NIR beam. This cooperative effect exceeds the sum of those from the individual beams and occurs for delays up to 1 ?s. We attribute it to the UV photolysis of ozone created by the NIR pulses. The resulting OH radicals oxidize NO{sub 2} and volatile organic compounds, producing condensable species.

Matthews, M.; Henin, S.; Pomel, F.; Kasparian, J.; Wolf, J.-P. [Université de Genève, GAP-Biophotonics, Chemin de Pinchat 22, 1211 Geneva 4 (Switzerland)] [Université de Genève, GAP-Biophotonics, Chemin de Pinchat 22, 1211 Geneva 4 (Switzerland); Théberge, F.; Daigle, J.-F. [Defence R and D Canada Valcartier, 2459 de la Bravoure Blvd., Quebec (Qc) G3J 1X5 (Canada)] [Defence R and D Canada Valcartier, 2459 de la Bravoure Blvd., Quebec (Qc) G3J 1X5 (Canada); Lassonde, P.; Kieffer, J.-C. [INRS-EMT, 1650 Lionel Boulet Blvd., Varennes, Quebec (Qc) J3X1S2 (Canada)] [INRS-EMT, 1650 Lionel Boulet Blvd., Varennes, Quebec (Qc) J3X1S2 (Canada)

2013-12-23T23:59:59.000Z

459

Total to Selective Extinction Ratios and Visual Extinctions from Ultraviolet Data  

E-Print Network [OSTI]

We present determinations of the total to selective extinction ratio R_V and visual extinction A_V values for Milky Way stars using ultraviolet color excesses. We extend the analysis of Gnacinski and Sikorski (1999) by using non-equal weights derived from observational errors. We present a detailed discussion of various statistical errors. In addition, we estimate the level of systematic errors by considering different normalization of the extinction curve adopted by Wegner (2002). Our catalog of 782 R_V and A_V values and their errors is available in the electronic form on the World Wide Web.

Anna Geminale; Piotr Popowski

2004-09-21T23:59:59.000Z

460

Highly reproducible and reliable metal/graphene contact by ultraviolet-ozone treatment  

SciTech Connect (OSTI)

Resist residue from the device fabrication process is a significant source of contamination at the metal/graphene contact interface. Ultraviolet Ozone (UVO) treatment is proven here, by X-ray photoelectron spectroscopy and Raman measurement, to be an effective way of cleaning the metal/graphene interface. Electrical measurements of devices that were fabricated by using UVO treatment of the metal/graphene contact region show that stable and reproducible low resistance metal/graphene contacts are obtained and the electrical properties of the graphene channel remain unaffected.

Li, Wei [Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing 100871 (China); Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899 (United States); Hacker, Christina A.; Cheng, Guangjun; Hight Walker, A. R.; Richter, Curt A.; Gundlach, David J., E-mail: david.gundlach@nist.gov, E-mail: liangxl@pku.edu.cn [Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899 (United States); Liang, Yiran; Tian, Boyuan; Liang, Xuelei, E-mail: david.gundlach@nist.gov, E-mail: liangxl@pku.edu.cn; Peng, Lianmao [Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing 100871 (China)

2014-03-21T23:59:59.000Z

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.


461

ultraviolet | EMSL  

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

and early disease diagnostic applications. Citation: Lee AC, D Du, B Chen, CK Heng, TM Lim, and Y Lin.2014."Electrochemical detection of leukemia oncogenes using...

462

EMSL - ultraviolet  

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

class"field-item even" property"schema:citation">Lee AC, D Du, B Chen, CK Heng, TM Lim, and Y Lin.2014."Electrochemical detection of leukemia oncogenes using...

463

Use of the extreme groups approach: A critical reexamination and new recommendations  

E-Print Network [OSTI]

Analysis of continuous variables sometimes proceeds by selecting individuals on the basis of extreme scores of a sample distribution and submitting only those extreme scores to further analysis. This sampling method is ...

Preacher, K. J.; Rucker, D. D.; MacCallum, R. C.; Nicewander, W. A.

2005-01-01T23:59:59.000Z

464

An extremely radioresistant green eukaryote for radionuclide bio-decontamination in the nuclear  

E-Print Network [OSTI]

of adaptation to extreme environments. Introduction Nuclear energy technologies generate radioactiveAn extremely radioresistant green eukaryote for radionuclide bio-decontamination in the nuclear Blignyabcd Nuclear activities generate radioactive elements which require processes for their decontamination

Boyer, Edmond

465

Laser Desorption Postionization Mass Spectrometry of Antibiotic-Treated Bacterial Biofilms using Tunable Vacuum Ultraviolet Radiation  

SciTech Connect (OSTI)

Laser desorption postionization mass spectrometry (LDPI-MS) with 8.0 ? 12.5 eV vacuum ultraviolet synchrotron radiation is used to single photon ionize antibiotics andextracellular neutrals that are laser desorbed both neat and from intact bacterial biofilms. Neat antibiotics are optimally detected using 10.5 eV LDPI-MS, but can be ionized using 8.0 eV radiation, in agreement with prior work using 7.87 eV LDPI-MS. Tunable vacuum ultraviolet radiation also postionizes laser desorbed neutrals of antibiotics and extracellular material from within intact bacterial biofilms. Different extracellular material is observed by LDPI-MS in response to rifampicin or trimethoprim antibiotic treatment. Once again, 10.5 eV LDPI-MS displays the optimum trade-off between improved sensitivity and minimum fragmentation. Higher energy photons at 12.5 eV produce significant parent ion signal, but fragment intensity and other low mass ions are also enhanced. No matrix is added to enhance desorption, which is performed at peak power densities insufficient to directly produce ions, thus allowing observation of true VUV postionization mass spectra of antibiotic treated biofilms.

Gasper, Gerald L.; Takahashi, Lynelle K.; Zhou, Jia; Ahmed, Musahid; Moore, Jerry F.; Hanley, Luke

2010-08-04T23:59:59.000Z

466

Absorption cross section of RN and SdS extremal black hole  

E-Print Network [OSTI]

The nature of scalar wave functions near the horizon of Reissner Nordstrom (RN) extremal and Schwarzschild-de Sitter (SdS) extremal black holes are found using WKB approximation and the effect of reflection of waves from the horizon. The absorption cross section $\\sigma_{abs}$ when RN extremal and SdS extremal black holes placed in a Klein-Gordon field is calculated.

Sini R; Nijo Varghese; V C Kuriakose

2008-02-29T23:59:59.000Z

467

Ternary particles with extreme N/Z ratios from neutron-induced fission  

SciTech Connect (OSTI)

The existing ternary fission models can well reproduce the yields of the most abundant light charged particles. However, these models tend to significantly overestimate the yields of ternary particles with an extreme N/Z ratio: {sup 3}He, {sup 11}Li, {sup 14}Be, etc. The experimental yields of these isotopes were investigated with the recoil separator LOHENGRIN down to a level of 10{sup {minus}10} per fission. Results from the fissioning systems {sup 233}U (n{sub th}, f), {sup 235}U(n{sub th},f), {sup 239}Pu(n{sub th},f) {sup 241}Pu(n{sub th},f) and {sup 245}Cm(n{sub th},f) are presented and the implications for the ternary fission models are discussed.

Koster, U.; Faust, H.; Friedrichs, T.; Oberstedt, S.; Fioni, G.; Grob, M.; Ahmad, I. J.; Devlin, M.; Heinz, A.; Kondev, F. G.; Lauritsen, T.; Sarantites, D. G.; Siem, S.; Sobotka, L. G.; Sonzogni, A.

2000-05-16T23:59:59.000Z

468

Towards a better understanding of the structure of nano-minerals at ambient and extreme conditions  

SciTech Connect (OSTI)

The high-pressure (HP) behavior of nano-crystalline mackinawite (n-FeS) with particle sizes of 6, 7, and 8 nm has been investigated by high-energy X-ray total scattering and pair distribution function analysis. An irreversible first-order structural phase transition from tetragonal mackinawite to orthorhombic FeS-II was observed at about 3 GPa. The transition is induced by the closure of the van-der-Waals gap in the layered mackinawite structure. A grain size effect on the transition pressure and the compressibility was observed. The n-FcS study is an example of a broad class of nano-crystalline minerals where the total scattering (TS) approach provides significant new information on local-, intermediate- and long-range structure. Under extreme conditions, of pressure in this case, straightforward modifications allow quantitative descriptions of the transformations mechanisms.

Parise, John B.; Ehm, Lars; Michel, F. Marc [Stony Brook University, Department of Geosciences and Mineral Physics Institute (United States); Antao, Sytle; Chupas, Peter J.; Lee, Peter L.; Martin, C. David; Shastri, Sarvjit [X-ray Science Division, Argonne National Laboratory, Argonne IL 60439 (United States)

2009-01-29T23:59:59.000Z

469

The structure of the extreme Schwarzschild-de Sitter space-time  

E-Print Network [OSTI]

The extreme Schwarzschild-de Sitter space-time is a spherically symmetric solution of Einstein's equations with a cosmological constant Lambda and mass parameter m>0 which is characterized by the condition that 9 Lambda m^2=1. The global structure of this space-time is here analyzed in detail. Conformal and embedding diagrams are constructed, and synchronous coordinates which are suitable for a discussion of the cosmic no-hair conjecture are presented. The permitted geodesic motions are also analyzed. By a careful investigation of the geodesics and the equations of geodesic deviation, it is shown that specific families of observers escape from falling into the singularity and approach nonsingular asymptotic regions which are represented by special "points" in the complete conformal diagram. The redshift of signals emitted by particles which fall into the singularity, as detected by those observers which escape, is also calculated.

J. Podolsky

1999-10-08T23:59:59.000Z

470

Towards more realistic extreme load predictions J. Mann, G.C. Larsen and T.J. Larsen  

E-Print Network [OSTI]

generator is demonstrated by emulating a measured extreme negative wind shear event. The aeroelastic response of a wind turbine, exposed to the generated extreme wind field, is assessed, and in addition are extreme (short term) wind shear, extreme wind speed gusts and extreme wind direction gusts. It is common

471

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 (OSTI)

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

472

Solidification at the High and Low Rate Extreme  

SciTech Connect (OSTI)

The microstructures formed upon solidification are strongly influenced by the imposed growth rates on an alloy system. Depending on the characteristics of the solidification process, a wide range of growth rates is accessible. The prevailing solidification mechanisms, and thus the final microstructure of the alloy, are governed by these imposed growth rates. At the high rate extreme, for instance, one can have access to novel microstructures that are unattainable at low growth rates. While the low growth rates can be utilized for the study of the intrinsic growth behavior of a certain phase growing from the melt. Although the length scales associated with certain processes, such as capillarity, and the diffusion of heat and solute, are different at low and high rate extremes, the phenomena that govern the selection of a certain microstructural length scale or a growth mode are the same. Consequently, one can analyze the solidification phenomena at both high and low rates by using the same governing principles. In this study, we examined the microstructural control at both low and high extremes. For the high rate extreme, the formation of crystalline products and factors that control the microstructure during rapid solidification by free-jet melt spinning are examined in Fe-Si-B system. Particular attention was given to the behavior of the melt pool at different quench-wheel speeds. Since the solidification process takes place within the melt-pool that forms on the rotating quench-wheel, we examined the influence of melt-pool dynamics on nucleation and growth of crystalline solidification products and glass formation. High-speed imaging of the melt-pool, analysis of ribbon microstructure, and measurement of ribbon geometry and surface character all indicate upper and lower limits for melt-spinning rates for which nucleation can be avoided, and fully amorphous ribbons can be achieved. Comparison of the relevant time scales reveals that surface-controlled melt-pool oscillation may be the dominant factor governing the onset of unsteady thermal conditions accompanied by varying amounts of crystalline nucleation observed near the lower limit. At high quench-wheel velocities, the influence of these oscillations is minimal due to very short melt-pool residence times. However, microstructural evidence suggests that the entrapment of gas pockets at the wheel-metal interface plays a critical role in establishing the upper rate limit. An observed transition in wheel-side surface character with increasing melt-spinning rate supports this conclusion.

Halim Meco

2004-12-19T23:59:59.000Z

473

Method For Synthesizing Extremely High-Temperature Melting Materials  

DOE Patents [OSTI]

The invention relates to a method of synthesizing high-temperature melting materials. More specifically the invention relates to a containerless method of synthesizing very high temperature melting materials such as borides, carbides and transition-metal, lanthanide and actinide oxides, using an Aerodynamic Levitator and a laser. The object of the invention is to provide a method for synthesizing extremely high-temperature melting materials that are otherwise difficult to produce, without the use of containers, allowing the manipulation of the phase (amorphous/crystalline/metastable) and permitting changes of the environment such as different gaseous compositions.

Saboungi, Marie-Louise (Chicago, IL); Glorieux, Benoit (Perpignan, FR)

2005-11-22T23:59:59.000Z

474

Method for synthesizing extremely high-temperature melting materials  

SciTech Connect (OSTI)

The invention relates to a method of synthesizing high-temperature melting materials. More specifically the invention relates to a containerless method of synthesizing very high temperature melting materials such as carbides and transition-metal, lanthanide and actinide oxides, using an aerodynamic levitator and a laser. The object of the invention is to provide a method for synthesizing extremely high-temperature melting materials that are otherwise difficult to produce, without the use of containers, allowing the manipulation of the phase (amorphous/crystalline/metastable) and permitting changes of the environment such as different gaseous compositions.

Saboungi, Marie-Louise (Chicago, IL); Glorieux, Benoit (Perpignan, FR)

2007-11-06T23:59:59.000Z

475

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

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-Up from theDepartment ofEnergy.pdfApplications:AdjustmentDepartment'Extreme Makeover:

476

Extremal charged rotating dilaton black holes in odd dimensions  

SciTech Connect (OSTI)

Employing higher-order perturbation theory, we find a new class of charged rotating black hole solutions of Einstein-Maxwell-dilaton theory with general dilaton coupling constant. Starting from the Myers-Perry solutions, we use the electric charge as the perturbative parameter, and focus on extremal black holes with equal-magnitude angular momenta in odd dimensions. We perform the perturbations up to 4th order for black holes in 5 dimensions and up to 3rd order in higher odd dimensions. We calculate the physical properties of these black holes and study their dependence on the charge and the dilaton coupling constant.

Allahverdizadeh, Masoud; Kunz, Jutta; Navarro-Lerida, Francisco [Institut fuer Physik, Universitaet Oldenburg, Postfach 2503 D-26111 Oldenburg (Germany); Departamento de Fisica Atomica, Molecular y Nuclear, Ciencias Fisicas Universidad Complutense de Madrid, E-28040 Madrid (Spain)

2010-09-15T23:59:59.000Z

477

Extremal Charged Rotating Dilaton Black Holes in Odd Dimensions  

E-Print Network [OSTI]

Employing higher order perturbation theory, we find a new class of charged rotating black hole solutions of Einstein-Maxwell-dilaton theory with general dilaton coupling constant. Starting from the Myers-Perry solutions, we use the electric charge as the perturbative parameter, and focus on extremal black holes with equal-magnitude angular momenta in odd dimensions. We perform the perturbations up to 4th order for black holes in 5 dimensions and up to 3rd order in higher odd dimensions. We calculate the physical properties of these black holes and study their dependence on the charge and the dilaton coupling constant.

Masoud Allahverdizadeh; Jutta Kunz; Francisco Navarro-Lerida

2010-07-24T23:59:59.000Z

478

Leptonic CP violation: zero, maximal or between the two extremes  

E-Print Network [OSTI]

Discovery of the CP-violation in the lepton sector is one of the challenges of the particle physics. We search for possible principles, symmetries and phenomenological relations that can lead to particular values of the CP-violating Dirac phase, $\\delta$. In this connection we discuss two extreme cases: the zero phase, $\\delta = 0$, and the maximal CP-violation, $\\delta = \\pm \\pi/2$, and relate them to the peculiar pattern of the neutrino mixing. The maximal CP-violation can be related to the $\

Y. Farzan; A. Yu. Smirnov

2006-10-25T23:59:59.000Z

479

Extreme Value GARCH modelling with Bayesian Xin Zhao, Les Oxley, Carl Scarrott and Marco Reale  

E-Print Network [OSTI]

Extreme Value GARCH modelling with Bayesian Inference Xin Zhao, Les Oxley, Carl Scarrott and Marco Reale No: 05/2009 #12;2 WORKING PAPER No: 05/2009 Extreme Value GARCH modelling with Bayesian inference, GEV-GARCH, is developed by implementing the GARCH volatility mechanism in these extreme value model

Hickman, Mark

480

Irrigation cooling effect on temperature and heat index extremes David B. Lobell,1  

E-Print Network [OSTI]

Irrigation cooling effect on temperature and heat index extremes David B. Lobell,1 Celine J on average monthly temperatures. Given the importance of temperature (T) extremes to agriculture and human health, we evaluated irrigation induced changes in various metrics of T extremes using daily observations

Kueppers, Lara M.

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

The robust dynamical contribution to precipitation extremes in idealized warming simulations  

E-Print Network [OSTI]

The robust dynamical contribution to precipitation extremes in idealized warming simulations across shift under climate warming on the distribution of precipitation extremes and the associated sensitivity in the frequency of the most extreme categories of the precipitation events at the poleward side of the midlatitude

Chen, Gang

482

Detectable Changes in the Frequency of Temperature Extremes SIMONE MORAK AND GABRIELE C. HEGERL  

E-Print Network [OSTI]

Detectable Changes in the Frequency of Temperature Extremes SIMONE MORAK AND GABRIELE C. HEGERL of hot and cold extremes over land can be explained by climate variability or whether they show a detectable response to external influences. The authors analyze changes in the frequency of moderate-to-extreme

Hegerl, Gabriele Clarissa "Gabi"

483

SPATIALLY PENALIZED REGRESSION FOR DEPENDENCE ANALYSIS OF RARE EVENTS: A STUDY IN PRECIPITATION EXTREMES  

E-Print Network [OSTI]

EXTREMES Debasish Das1 , Auroop Ganguly2 , Snigdhansu Chatterjee3 , Vipin Kumar4 and Zoran Obradovic1 1, USA ABSTRACT Discovery of dependence structure between precipitation extremes and other climate understanding the drivers of this complex phenomenon as well as short-term prediction of extremes occurrence

Obradovic, Zoran

484

Mining Extremes: Severe Rainfall and Climate Change Debasish Das1,2,*  

E-Print Network [OSTI]

Mining Extremes: Severe Rainfall and Climate Change Debasish Das1,2,* and Evan Kodra2 and Zoran of extreme value data have tended to focus on limiting cases and assumptions of independence. However and finite data that follow complex processes. The importance of extremes has been rapidly growing in areas

Obradovic, Zoran

485

Introduction Large-scale circulation Clouds Conclusions European temperature extremes in CMIP5  

E-Print Network [OSTI]

Introduction Large-scale circulation Clouds Conclusions European temperature extremes in CMIP5 extremes in CMIP5 EUCLIPSE ­ May 2012 ­ Paris #12;Introduction Large-scale circulation Clouds Conclusions Introduction Objectives European temperature extremes: understand model biases & uncertainties under future

Ribes, Aurélien

486

Changes in winter precipitation extremes for the western United States under a warmer climate as simulated  

E-Print Network [OSTI]

Changes in winter precipitation extremes for the western United States under a warmer climate find a consistent and statistically significant increase in the intensity of future extreme winter consistently show an increase in the intensity of extreme winter precipitation with the multi-model mean

Castro, Christopher L.

487

Increasing Climate Extremes and the New Climate Dice 10 August 2012  

E-Print Network [OSTI]

1 Increasing Climate Extremes and the New Climate Dice 10 August 2012 James Hansen, Makiko Sato-July data) exceeds any that occurred in the 1930s. We reconfirm our conclusion that the increasing extremity of heat waves and the area covered by extreme events is caused by global warming. The location and timing

Hansen, James E.

488

hal-00187600,version1-14Nov2007 Models for dependent extremes using stable mixtures  

E-Print Network [OSTI]

hal-00187600,version1-14Nov2007 Models for dependent extremes using stable mixtures Running/short title: Models for dependent extremes Anne-Laure Foug`eres ´Equipe Modal'X, Universit´e Paris X-stable, multivariate extreme value distribu- tion, pitting corrosion, random effect, positive stable variables

Paris-Sud XI, Université de

489

Notes and Discussion Vole Population Dynamics: Influence of Weather Extremes on Stoppage of  

E-Print Network [OSTI]

Notes and Discussion Vole Population Dynamics: Influence of Weather Extremes on Stoppage of Population Growth ABSTRACT.--Effects of 74 episodes of extreme weather on stoppage of population growth of extreme weather may have stopped population growth of only six M. ochrogaster fluctuations and of two M

Oli, Madan K.

490

Bayesian Models for Spatial Extremes Application to inferring high values of  

E-Print Network [OSTI]

Bayesian Models for Spatial Extremes Application to inferring high values of ground-level ozone by the National Science Foundation (NSF) #12;Outline · Background to Ozone Application · Background to Extreme Value Analysis ­ Two approaches: 1. Model all of the data, and look at extremes. 2. Only model

Gilleland, Eric

491

Climate Extremes Promote Fatal Co-Infections during Canine Distemper Epidemics in African Lions  

E-Print Network [OSTI]

Climate Extremes Promote Fatal Co-Infections during Canine Distemper Epidemics in African Lions. Paul, Minnesota, United States of America Abstract Extreme climatic conditions may alter historic host to clearly illustrate how climate extremes can promote a complex interplay between epidemic and endemic

Weiblen, George D

492

Statistical Modelling of Spatial Extremes A. C. Davison, S. A. Padoan and M. Ribatet  

E-Print Network [OSTI]

Statistical Modelling of Spatial Extremes A. C. Davison, S. A. Padoan and M. Ribatet September 5, 2011 Summary The areal modelling of the extremes of a natural process such as rainfall or tempera- ture is important in environmental statistics; for example, understanding extreme areal rainfall is crucial in flood

Ribatet, Mathieu

493

Modelling spatially-dependent non-stationary extremes with application to hurricane-induced wave heights  

E-Print Network [OSTI]

Modelling spatially-dependent non-stationary extremes with application to hurricane-induced wave frequently that the extremes of a variable of interest are non-stationary, varying systematically in space are used to infer the marginal behaviour of the extremes at individual sites, while making proper

Guillas, Serge

494

Changes in daily temperature and precipitation extremes in central and south Asia  

E-Print Network [OSTI]

Changes in daily temperature and precipitation extremes in central and south Asia A. M. G. Klein in indices of climate extremes are studied on the basis of daily series of temperature and precipitation, the indices of temperature extremes indicate warming of both the cold tail and the warm tail

Klein Tank, Albert

495

A Sparse Bayesian Model for Dependence Analysis of Extremes: Climate Applications  

E-Print Network [OSTI]

A Sparse Bayesian Model for Dependence Analysis of Extremes: Climate Applications Debasish Das applications, such as climate, finance and social media among others, we are often interested in extreme events. An important part of modeling extremes is dis- covery of covariates on which the quantities related

Obradovic, Zoran

496

Motivation Measurements EVA Results Issues/Future Work Weather and Climate Extremes: cape times shear  

E-Print Network [OSTI]

Motivation Measurements EVA Results Issues/Future Work Weather and Climate Extremes: cape times Weather/Climate Extremes 1 / 19 c University Corporation for Atmospheric Research. All rights reserved scales. E Gilleland Weather/Climate Extremes 2 / 19 c University Corporation for Atmospheric Research

Gilleland, Eric

497

STATISTICS OF EXTREMES IN CLIMATOLOGY AND HYDROLOGY PART I: BACKGROUND AND TRADITIONAL APPROACHES  

E-Print Network [OSTI]

1 STATISTICS OF EXTREMES IN CLIMATOLOGY AND HYDROLOGY PART I: BACKGROUND AND TRADITIONAL APPROACHES;3 Outline (1) Historical Perspective (2) Basic Characteristics of Climate/Hydrologic Extremes (3) Traditional Statistical Analysis of Climate/Hydrologic Extremes (4) Spatial/Temporal Dependence of Climate

Katz, Richard

498

Extreme Day Returns on Stocks: Evidence from Sweden* Adri De Ridder  

E-Print Network [OSTI]

Extreme Day Returns on Stocks: Evidence from Sweden* Adri De Ridder Gotland University Visby and Amalia Wallenberg foundation is gratefully acknowledged. #12;Extreme Day Returns on Stocks: Evidence from Sweden Abstract In this study we document that the frequency of extreme trading days, defined

Djehiche, Boualem

499

Policy Name: Closing due to Indoor Temperature Extremes Originating/Responsible Department: Facilities Management and Planning  

E-Print Network [OSTI]

Policy Name: Closing due to Indoor Temperature Extremes Originating/Responsible Department to be followed in the event that indoor temperature extremes prompt the closing of any building or work area. The closing of any building or work area due to indoor temperatures extremes shall be subject to operational

Dawson, Jeff W.

500

Changes in Temperature and Precipitation Extremes in the IPCC Ensemble of Global Coupled Model Simulations  

E-Print Network [OSTI]

Changes in Temperature and Precipitation Extremes in the IPCC Ensemble of Global Coupled Model September 2006) ABSTRACT Temperature and precipitation extremes and their potential future changes on Climate Change (IPCC) diagnostic exercise for the Fourth Assessment Report (AR4). Climate extremes