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


1

Classroom Observations of Instructional Practices and Technology Use by Elementary School Teachers and Students in an Ethnically-and Economically-Diverse School District  

E-Print Network (OSTI)

The purpose of this study was to observe pre-kindergarten through fifth-grade public school classrooms to examine differences among instructional practices and technology use by teachers, students and the overall classroom. The current study differed from and built upon previous classroom observational research in a number of major ways. First, the observational data examined both student and teacher technology use and the availability of technology in the classroom. Second, authentic classroom behaviors were examined in relation to technology use; specifically, behaviors related to the impact of technology use on student engagement as well as differences among technology use in classrooms and differences by student socio-economic status. Finally, unlike previous studies, this study focused specifically on pre-kindergarten through fifth-grade classrooms from the same large public school district that was diverse by both socio-economic status (SES) and by student ethnicity. Overall, the results of this study suggest that technology has not been adequately implemented into the observed classrooms. Technology was available but was not used to a great extent. When technology was implemented, teachers were primarily observed using it to present material and students were observed using it almost exclusively for basic skills activities. This low-level of technology integration occurred in elementary schools of a high performing school district which had a technology plan in place, a low student to computer ratio, and 100 percent of the classrooms had Internet access. Furthermore, only 15 percent of teachers were observed integrating technology to a great extent; however, students in these classrooms were observed on task significantly more frequently than students in classrooms where technology was observed less or not at all. On the other hand, students were observed off task significantly more in classrooms where either no technology integration was observed or where it was only observed a moderate amount. These findings support and build upon previous observational studies. There is still a need, however, for strong, empirical research to be conducted to further examine the use of technology in elementary classrooms.

Rollins, Kayla Braziel

2011-08-01T23:59:59.000Z

2

Make Observations  

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

and public perceptions and preferences, help improve our understanding of risk, vulnerability, resilience, and adaptive capacity. How does USGCRP make observations? USGCRP...

3

Observations - CECM  

E-Print Network (OSTI)

May 10, 1999 ... A broad range of observations were made, culled from the various sources mentioned. Those bearing directly on the participatory process are ...

4

Atomic Collapse Observed  

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

Collapse State Observed Aided by Simulations, Scientists Observe Atomic Collapse State Quantum Mechanics Prediction Confirmed in Graphene Using NERSC's Hopper April 26, 2013 |...

5

Protocols from perceptual observations  

Science Conference Proceedings (OSTI)

This paper presents a cognitive vision system capable of autonomously learning protocols from perceptual observations of dynamic scenes. The work is motivated by the aim of creating a synthetic agent that can observe a scene containing interactions between ... Keywords: Autonomous learning, Cognitive vision, Inductive logic programming, Spatio-temporal reasoning, Symbol grounding, Unsupervised clustering

Chris J. Needham; Paulo E. Santos; Derek R. Magee; Vincent Devin; David C. Hogg; Anthony G. Cohn

2005-09-01T23:59:59.000Z

6

Green Thunderstorms Observed  

Science Conference Proceedings (OSTI)

Green thunderstorms have been observed from time to time in association with deep convection or severe weather events. Often the green coloration has been attributed to hail or to reflections of light from green foliage on the ground. Some ...

Frank W. Gallagher III; William H. Beasley; Craig F. Bohren

1996-12-01T23:59:59.000Z

7

Tropical observability and predictability  

E-Print Network (OSTI)

Many studies have investigated tropical data assimilation in the context of global models or specifically for tropical cyclones, but relatively few have focused on the mesoscale predictability and observability of the ...

Whitcomb, Timothy Robert

2008-01-01T23:59:59.000Z

8

Multifunctional Mesoscale Observing Networks  

Science Conference Proceedings (OSTI)

More than 120 scientists, engineers, administrators, and users met on 8–10 December 2003 in a workshop format to discuss the needs for enhanced three-dimensional mesoscale observing networks. Improved networks are seen as being critical to ...

Walter F. Dabberdt; Thomas W. Schlatter; Frederick H. Carr; Elbert W. Joe Friday; David Jorgensen; Steven Koch; Maria Pirone; F. Martin Ralph; Juanzhen Sun; Patrick Welsh; James W. Wilson; Xiaolei Zou

2005-07-01T23:59:59.000Z

9

Quantum Mechanics Without Observers  

E-Print Network (OSTI)

The measurement problem and the role of observers have plagued quantum mechanics since its conception. Attempts to resolve these have introduced anthropomorphic or non-realist notions into physics. A shift of perspective based upon process theory and utilizing methods from combinatorial games, interpolation theory and complex systems theory results in a novel realist version of quantum mechanics incorporating quasi-local, nondeterministic hidden variables that are compatible with the no-hidden variable theorems and relativistic invariance, and reproduce the standard results of quantum mechanics to a high degree of accuracy without invoking observers.

W. H. Sulis

2013-02-18T23:59:59.000Z

10

Network Observability Transitions  

E-Print Network (OSTI)

In the modeling, monitoring, and control of complex networks, a fundamental problem concerns the comprehensive determination of the state of the system from limited measurements. Using power grids as example networks, we show that this problem leads to a new type of percolation transition, here termed a {\\it network observability transition}, which we solve analytically for the configuration model. We also demonstrate a dual role of the network's community structure, which both facilitates optimal measurement placement and renders the networks substantially more sensitive to `observability attacks'. Aside from their immediate implications for the development of smart grids, these results provide insights into decentralized biological, social, and technological networks.

Yang, Yang; Motter, Adilson E; 10.1103/PhysRevLett.109.258701

2013-01-01T23:59:59.000Z

11

Observations of Edge Turbulence  

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

Edge Turbulence Edge Turbulence near the X-point of Alcator C-Mod APS-2007 (1) J.L. Terry, S.J. Zweben*, B. LaBombard, I. Cziegler, O. Grulke + , D.P. Stotler* MIT - Plasma Science and Fusion Center *Princeton Plasma Physics Laboratory + MPI for Plasma Physics, EURATOM Assoc., Greifswald, Germany American Physical Society - Div. of Plasma Physics Orlando, FL Nov. 12 - Nov. 16, 2007 APS-2007 (2) Background and Motivation for "Xpt-region" View Strong edge turbulence has been observed in nearly all magnetic confinement devices. Desire predictive capability Most previous measurements made near outboard midplane where the turbulence has the following main features: - generation is ballooning-like (absent at inboard midplane, etc.) - filaments/blobs moves radially outward with some poloidal motion

12

Strong planning under partial observability  

Science Conference Proceedings (OSTI)

Rarely planning domains are fully observable. For this reason, the ability to deal with partial observability is one of the most important challenges in planning. In this paper, we tackle the problem of strong planning under partial observability in ... Keywords: Binary decision diagrams, Heuristic search in belief space, Planning in nondeterministic domains, Planning under partial observability, Symbolic model checking

Piergiorgio Bertoli; Alessandro Cimatti; Marco Roveri; Paolo Traverso

2006-04-01T23:59:59.000Z

13

Monthly Temperature Observations for Uganda  

Science Conference Proceedings (OSTI)

The International Surface Temperature Initiative is a worldwide effort to locate weather observations, digitize them for public access, and attach provenance to them. As part of that effort, this study sought documents of temperature observations ...

John R. Christy

2013-10-01T23:59:59.000Z

14

Marine Observations of Old Weather  

Science Conference Proceedings (OSTI)

Weather observations are vital for climate change monitoring and prediction. For the world's oceans, there are many meteorological and oceanographic observations available back to the mid-twentieth century, but coverage is limited in earlier ...

Philip Brohan; Rob Allan; J. Eric Freeman; Anne M. Waple; Dennis Wheeler; Clive Wilkinson; Scott Woodruff

2009-02-01T23:59:59.000Z

15

Ensemble Transformation and Adaptive Observations  

Science Conference Proceedings (OSTI)

Suppose that the geographical and temporal resolution of the observational network could be changed on a daily basis. Of all the possible deployments of observational resources, which particular deployment would minimize expected forecast error? ...

Craig H. Bishop; Zoltan Toth

1999-06-01T23:59:59.000Z

16

Stratospheric Satellites for Earth Observations  

Science Conference Proceedings (OSTI)

Advanced, robust, yet inexpensive observational platforms and networks of platforms will make revolutionary Earth science observations possible in the next 30 years. One new platform concept that is needed is a long-duration stratospheric balloon ...

Alexey Pankine; Kerry Nock; Zhanqing Li; David Parsons; Michael Purucker; Warren Wiscombe; Elliot Weinstock

2009-08-01T23:59:59.000Z

17

Field observations and lessons learned  

SciTech Connect

This presentation outlines observations and lessons learned from the Megaports program. It provides: (1) details of field and technical observations collected during LANL field activities at ports around the world and details of observations collected during radiation detections system testing at Los Alamos National Laboratory; (2) provides suggestions for improvement and efficiency; and (3) discusses possible program execution changes for more effective operations.

Nielsen, Joh B [Los Alamos National Laboratory

2010-01-01T23:59:59.000Z

18

Observation  

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

the large mass of the implies an affinity to Higgs bosons. Within the SM, the Higgs boson is related to the mechanism by which the quarks, leptons and force-carrying gauge...

19

Observation Wells | Open Energy Information  

Open Energy Info (EERE)

Observation Wells Observation Wells Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Observation Wells Details Activities (7) Areas (7) Regions (0) NEPA(15) Exploration Technique Information Exploration Group: Drilling Techniques Exploration Sub Group: Development Drilling Parent Exploration Technique: Development Drilling Information Provided by Technique Lithology: Stratigraphic/Structural: Hydrological: Total dissolved solids, fluid pressure, flow rates, and flow direction Thermal: Monitors temperature of circulating fluids Dictionary.png Observation Wells: An observation well is used to monitor important hydrologic parameters in a geothermal system that can indicate performance, longevity, and transient processes. Other definitions:Wikipedia Reegle

20

State observer for synchronous motors  

DOE Patents (OSTI)

A state observer driven by measurements of phase voltages and currents for estimating the angular orientation of a rotor of a synchronous motor such as a variable reluctance motor (VRM). Phase voltages and currents are detected and serve as inputs to a state observer. The state observer includes a mathematical model of the electromechanical operation of the synchronous motor. The characteristics of the state observer are selected so that the observer estimates converge to the actual rotor angular orientation and velocity, winding phase flux linkages or currents.

Lang, Jeffrey H. (Waltham, MA)

1994-03-22T23:59:59.000Z

Note: This page contains sample records for the topic "observations classroom observations" 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

ARM - Mobile Aerosol Observing System  

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

FacilitiesMobile Aerosol Observing System FacilitiesMobile Aerosol Observing System AMF Information Science Architecture Baseline Instruments AMF1 AMF2 AMF3 Data Operations AMF Fact Sheet Images Contacts AMF Deployments Hyytiälä, Finland, 2014 Manacapuru, Brazil, 2014 Oliktok Point, Alaska, 2013 Los Angeles, California, to Honolulu, Hawaii, 2012 Cape Cod, Massachusetts, 2012 Gan Island, Maldives, 2011 Ganges Valley, India, 2011 Steamboat Springs, Colorado, 2010 Graciosa Island, Azores, 2009-2010 Shouxian, China, 2008 Black Forest, Germany, 2007 Niamey, Niger, 2006 Point Reyes, California, 2005 Mobile Aerosol Observing System Intensive aerosol observations conducted on the campus of Brookhaven National Laboratory on Long Island, New York, using the ARM Mobile Aerosol Observing System. Intensive aerosol observations conducted on the campus of Brookhaven

22

Cornman's definition of observation terms  

Science Conference Proceedings (OSTI)

reconcile what is described in mentalistic terms with materialism. ... It is clearly important that the observation terms should not include terms which are ...

23

Moored Observations of Precipitation Temperature  

Science Conference Proceedings (OSTI)

Direct observations of precipitation temperature were made from a surface buoy deployed for four months in the western Pacific warm pool. The observed rain droplet temperatures are equal to the wet-bulb temperature to within the measured wet-bulb ...

Steven P. Anderson; Alan Hinton; Robert A. Weller

1998-08-01T23:59:59.000Z

24

Doppler Radar Observations of Mammatus  

Science Conference Proceedings (OSTI)

Observations of mammatus-like cloud features associated with a convective rain shower were obtained using a vertically pointing 8-mm-wavelength Doppler radar. The radar's excellent sensitivity and resolution allowed even very weak, finescale ...

Brooks E. Martner

1995-10-01T23:59:59.000Z

25

Observational Tests of Modified Gravity  

E-Print Network (OSTI)

Modified gravity theories have richer observational consequences for large-scale structure than conventional dark energy models, in that different observables are not described by a single growth factor even in the linear regime. We examine the relationships between perturbations in the metric potentials, density and velocity fields, and discuss strategies for measuring them using gravitational lensing, galaxy cluster abundances, galaxy clustering/dynamics and the ISW effect. We show how a broad class of gravity theories can be tested by combining these probes. A robust way to interpret observations is by constraining two key functions: the ratio of the two metric potentials, and the ratio of the Gravitational ``constant'' in the Poisson equation to Newton's constant. We also discuss quasilinear effects that carry signatures of gravity, such as through induced three-point correlations. Clustering of dark energy can mimic features of modified gravity theories and thus confuse the search for distinct signatures of such theories. It can produce pressure perturbations and anisotropic stresses, which breaks the equality between the two metric potentials even in general relativity. With these two extra degrees of freedom, can a clustered dark energy model mimic modified gravity models in all observational tests? We show with specific examples that observational constraints on both the metric potentials and density perturbations can in principle distinguish modifications of gravity from dark energy models. We compare our result with other recent studies that have slightly different assumptions (and apparently contradictory conclusions).

Bhuvnesh Jain; Pengjie Zhang

2007-09-17T23:59:59.000Z

26

ARM - Surface Aerosol Observing System  

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

FacilitiesSurface Aerosol Observing System FacilitiesSurface Aerosol Observing System AMF Information Science Architecture Baseline Instruments AMF1 AMF2 AMF3 Data Operations AMF Fact Sheet Images Contacts AMF Deployments Hyytiälä, Finland, 2014 Manacapuru, Brazil, 2014 Oliktok Point, Alaska, 2013 Los Angeles, California, to Honolulu, Hawaii, 2012 Cape Cod, Massachusetts, 2012 Gan Island, Maldives, 2011 Ganges Valley, India, 2011 Steamboat Springs, Colorado, 2010 Graciosa Island, Azores, 2009-2010 Shouxian, China, 2008 Black Forest, Germany, 2007 Niamey, Niger, 2006 Point Reyes, California, 2005 Surface Aerosol Observing System The ARM Mobile Facility (AMF) is equipped to quantify the interaction between clouds and aerosol particles. A counter-flow virtual impactor (CVI) is used to selectively sample cloud drops. The CVI takes advantage of the

27

Biomimetic Cloning of Quantum Observables  

E-Print Network (OSTI)

We propose a bio-inspired sequential quantum protocol for the cloning and preservation of the statistics associated to quantum observables of a given system. It combines the cloning of a set of commuting observables, permitted by the no-cloning and no-broadcasting theorems, with a controllable propagation of the initial state coherences to the subsequent generations. The protocol mimics the scenario in which an individual in an unknown quantum state copies and propagates its quantum information into an environment of blank qubits. Finally, we propose a realistic experimental implementation of this protocol in trapped ions.

U. Alvarez-Rodriguez; M. Sanz; L. Lamata; E. Solano

2013-12-12T23:59:59.000Z

28

Traffic observation and situation assessment  

Science Conference Proceedings (OSTI)

Utilization of camera systems for surveillance tasks (e. g. traffic monitoring) has become a standard procedure and has been in use for over 20 years. However, most of the cameras are operated locally and data analyzed manually. Locally means here a ... Keywords: cooperative distributed vision, multi-camera orientation, multi-camera system, multi-target tracking, situation, traffic observation

Ralf Reulke; Dominik Rueß; Kristian Manthey; Andreas Luber

2011-06-01T23:59:59.000Z

29

Observation of relativistic antihydrogen atoms  

DOE Green Energy (OSTI)

An observation of relativistic antihydrogen atoms is reported in this dissertation. Experiment 862 at Fermi National Accelerator Laboratory observed antihydrogen atoms produced by the interaction of a circulating beam of high momentum (3 < p < 9 GeV/c) antiprotons and a jet of molecular hydrogen gas. Since the neutral antihydrogen does not bend in the antiproton source magnets, the detectors could be located far from the interaction point on a beamline tangent to the storage ring. The detection of the antihydrogen is accomplished by ionizing the atoms far from the interaction point. The positron is deflected by a magnetic spectrometer and detected, as are the back to back photons resulting from its annihilation. The antiproton travels a distance long enough for its momentum and time of flight to be measured accurately. A statistically significant sample of 101 antihydrogen atoms has been observed. A measurement of the cross section for {bar H}{sup 0} production is outlined within. The cross section corresponds to the process where a high momentum antiproton causes e{sup +} e{sup -} pair creation near a nucleus with the e{sup +} being captured by the antiproton. Antihydrogen is the first atom made exclusively of antimatter to be detected. The observation experiment's results are the first step towards an antihydrogen spectroscopy experiment which would measure the n = 2 Lamb shift and fine structure.

Blanford, Glenn DelFosse

1998-01-01T23:59:59.000Z

30

HERSCHEL OBSERVATIONS OF INTERSTELLAR CHLORONIUM  

Science Conference Proceedings (OSTI)

Using the Herschel Space Observatory's Heterodyne Instrument for the Far-Infrared, we have observed para-chloronium (H{sub 2}Cl{sup +}) toward six sources in the Galaxy. We detected interstellar chloronium absorption in foreground molecular clouds along the sight lines to the bright submillimeter continuum sources Sgr A (+50 km s{sup -1} cloud) and W31C. Both the para-H{sup 35}{sub 2}Cl{sup +} and para-H{sup 37}{sub 2}Cl{sup +} isotopologues were detected, through observations of their 1{sub 11}-0{sub 00} transitions at rest frequencies of 485.42 and 484.23 GHz, respectively. For an assumed ortho-to-para ratio (OPR) of 3, the observed optical depths imply that chloronium accounts for {approx}4%-12% of chlorine nuclei in the gas phase. We detected interstellar chloronium emission from two sources in the Orion Molecular Cloud 1: the Orion Bar photodissociation region and the Orion South condensation. For an assumed OPR of 3 for chloronium, the observed emission line fluxes imply total beam-averaged column densities of {approx}2 Multiplication-Sign 10{sup 13} cm{sup -2} and {approx}1.2 Multiplication-Sign 10{sup 13} cm{sup -2}, respectively, for chloronium in these two sources. We obtained upper limits on the para-H{sup 35}{sub 2}Cl{sup +} line strengths toward H{sub 2} Peak 1 in the Orion Molecular cloud and toward the massive young star AFGL 2591. The chloronium abundances inferred in this study are typically at least a factor {approx}10 larger than the predictions of steady-state theoretical models for the chemistry of interstellar molecules containing chlorine. Several explanations for this discrepancy were investigated, but none has proven satisfactory, and thus the large observed abundances of chloronium remain puzzling.

Neufeld, David A.; Indriolo, Nick [Department of Physics and Astronomy, Johns Hopkins University, 3400 N. Charles St., Baltimore, MD 21218 (United States); Roueff, Evelyne; Le Bourlot, Jacques; Le Petit, Franck [Observatoire de Paris-Meudon, LUTH UMR 8102, 5 Pl. Jules Janssen, F-92195 Meudon Cedex (France); Snell, Ronald L. [Astronomy Department, University of Massachusetts at Amherst, Amherst, MA 01003 (United States); Lis, Dariusz; Monje, Raquel; Phillips, Thomas G. [Astronomy Department, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125 (United States); Benz, Arnold O. [Institute of Astronomy, ETH Zurich, 8092 Zurich (Switzerland); Bruderer, Simon [Max Planck Institut fuer Extraterrestrische Physik, Giessenbachstrasse 1, D-85748, Garching (Germany); Black, John H.; Larsson, Bengt [Department of Earth and Space Sciences, Chalmers University of Technology, Onsala (Sweden); De Luca, Massimo; Gerin, Maryvonne [LERMA, UMR 8112 du CNRS, Observatoire de Paris, Ecole Normale Superieure, UPMC and UCP (France); Goldsmith, Paul F.; Gupta, Harshal [JPL, California Institute of Technology, Pasadena, CA (United States); Melnick, Gary J. [Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138 (United States); Menten, Karl M. [Max-Planck-Institut fuer Radioastronomie, Auf dem Huegel 69, D-53121 Bonn (Germany); Nagy, Zsofia [Kapteyn Astronomical Institute University of Groningen, Groningen (Netherlands); and others

2012-03-20T23:59:59.000Z

31

Biomass Burning Observation Project Specifically,  

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

Burning Observation Project Burning Observation Project Specifically, the aircraft will obtain measurements of the microphysical, chemical, hygroscopic, and optical properties of aerosols. Data captured during BBOP will help scientists better understand how aerosols combine and change at a variety of distances and burn times. Locations Pasco, Washington. From July through September, the G-1 will be based out of its home base in Washington. From this location, it can intercept and measure smoke plumes from naturally occurring uncontrolled fires across Washington, Oregon, Idaho, Northern California, and Western Montana. Smoke plumes aged 0-5 hours are the primary targets for this phase of the campaign. Memphis, Tennessee. In October, the plane moves to Tennessee to sample prescribed

32

Spectra Observed Following Cargo Interrogation  

SciTech Connect

The authors present calculations of photon spectra observed following irradiation of bare HEU, HEU embedded in steel and wood cargos, and steel and wood alone. These spectra might be useful starting points for statistical detection efforts aimed at determining whether fissile material is present in a cargo. Detailed comparisons between calculations and experiments are presented and overall quite good (small {chi}{sup 2}) agreement is found. they do not present a complete solution to the problem of determining whether a given spectrum contains contributions from post-fission photons. However, it is shown that a brute-force fitting of observed spectra in terms of a few calculated ''basis'' spectra gives meaningful predictions about the presence of {sup 235}U in cargo. Though this may not be the most powerful method, it does give well defined confidence limits and seems to have strong predictive power.

Pruet, J; Prussin, S; Descalle, M; Hall, J

2005-11-15T23:59:59.000Z

33

Gamma Ray Pulsars: Multiwavelength Observations  

E-Print Network (OSTI)

High-energy gamma rays are a valuable tool for studying particle acceleration and radiation in the magnetospheres of energetic pulsars. The seven or more pulsars seen by instruments on the Compton Gamma Ray Observatory (CGRO) show that: the light curves usually have double-peak structures (suggesting a broad cone of emission); gamma rays are frequently the dominant component of the radiated power; and all the spectra show evidence of a high-energy turnover. For all the known gamma-ray pulsars, multiwavelength observations and theoretical models based on such observations offer the prospect of gaining a broad understanding of these rotating neutron stars. The Gamma-ray Large Area Space Telescope (GLAST), now in planning for a launch in 2007, will provide a major advance in sensitivity, energy range, and sky coverage.

David J. Thompson

2003-12-10T23:59:59.000Z

34

Spectra Observed Following Cargo Interrogation  

DOE Green Energy (OSTI)

The authors present calculations of photon spectra observed following irradiation of bare HEU, HEU embedded in steel and wood cargos, and steel and wood alone. These spectra might be useful starting points for statistical detection efforts aimed at determining whether fissile material is present in a cargo. Detailed comparisons between calculations and experiments are presented and overall quite good (small {chi}{sup 2}) agreement is found. they do not present a complete solution to the problem of determining whether a given spectrum contains contributions from post-fission photons. However, it is shown that a brute-force fitting of observed spectra in terms of a few calculated ''basis'' spectra gives meaningful predictions about the presence of {sup 235}U in cargo. Though this may not be the most powerful method, it does give well defined confidence limits and seems to have strong predictive power.

Pruet, J; Prussin, S; Descalle, M; Hall, J

2005-11-15T23:59:59.000Z

35

Definition: Observation Wells | Open Energy Information  

Open Energy Info (EERE)

Observation Wells Jump to: navigation, search Dictionary.png Observation Wells An observation well is used to monitor important hydrologic parameters in a geothermal system that...

36

Observation of the Top Quark  

E-Print Network (OSTI)

The D collaboration reports on a search for the Standard Model top quark in pp collisions at p s = 1:8 TeV at the Fermilab Tevatron, with an integrated luminosity of approximately 50 pb \\Gamma1 . We have searched for t t production in the dilepton and single-lepton decay channels, with and without tagging of b-quark jets. We observed 17 events with an expected background of 3:8 \\Sigma 0:6 events. The probability for an upward fluctuation of the background to produce the observed signal is 2 \\Theta 10 \\Gamma6 (equivalent to 4.6 standard deviations). The kinematic properties of the excess events are consistent with top quark decay. We conclude that we have observed the top quark and measure its mass to be 199 +19 \\Gamma21 (stat.) \\Sigma22 (syst.) GeV/c 2 and its production cross section to be 6:4 \\Sigma 2:2 pb. Typeset using REVT E X 3 In the Standard Model (SM), the top quark is the weak isospin partner of the b quark. The D collaboration published a lower limit on the mas...

Abachi Abbott Abolins

1995-01-01T23:59:59.000Z

37

Observation of the Top Quark  

E-Print Network (OSTI)

The DØ collaboration reports on a search for the Standard Model top quark in p¯p collisions at p s = 1:8 TeV at the Fermilab Tevatron, with an integrated luminosity of approximately 50 pb \\Gamma1 . We have searched for t ¯ t production in the dilepton and single-lepton decay channels, with and without tagging of b-quark jets. We observed 17 events with an expected background of 3:8 \\Sigma 0:6 events. The probability for an upward fluctuation of the background to produce the observed signal is 2 \\Theta 10 \\Gamma6 (equivalent to 4.6 standard deviations). The kinematic properties of the excess events are consistent with top quark decay. We conclude that we have observed the top quark and measure its mass to be 199 +19 \\Gamma21 (stat.) \\Sigma22 (syst.) GeV/c 2 and its production cross section to be 6:4 \\Sigma 2:2 pb. Typeset using REVT E X In the Standard Model (SM), the top quark is the weak isospin partner of the b quark. The DØ collaboration published a lower limit on the m...

Abachi Abbott

1995-01-01T23:59:59.000Z

38

Observation of Geo-Neutrinos  

E-Print Network (OSTI)

Geo-neutrinos, electron anti-neutrinos produced in beta decays of naturally occurring radioactive isotopes in the Earth, are a unique direct probe of our planet's interior. We report the first observation at more than 3$\\sigma$ C.L. of geo-neutrinos, performed with the Borexino detector at Laboratori Nazionali del Gran Sasso. Anti-neutrinos are detected through the neutron inverse beta decay reaction. With a 252.6 ton-yr fiducial exposure after all selection cuts, we detected 9.9^{+4.1}_{-3.4}(^{+14.6}_{-8.2}) geo-neutrino events, with errors corresponding to a 68.3%(99.73%) C.L. From the $\\ln{\\cal{L}}$ profile, the statistical significance of the Borexino geo-neutrino observation corresponds to a 99.997% C.L. Our measurement of the geo-neutrinos rate is 3.9^{+1.6}_{-1.3}(^{+5.8}_{-3.2}) events/(100ton-yr). This measurement rejects the hypothesis of an active geo-reactor in the Earth's core with a power above 3 TW at 95% C.L. The observed prompt positron spectrum above 2.6 MeV is compatible with that expected from european nuclear reactors (mean base line of approximately 1000 km). Our measurement of reactor anti-neutrinos excludes the non-oscillation hypothesis at 99.60% C.L.

Borexino Collaboration

2010-03-01T23:59:59.000Z

39

Jet Observables Without Jet Algorithms  

E-Print Network (OSTI)

We introduce a new class of event shapes to characterize the jet-like structure of an event. Like traditional event shapes, our observables are infrared/collinear safe and involve a sum over all hadrons in an event, but like a jet clustering algorithm, they incorporate a jet radius parameter and a transverse momentum cut. Three of the ubiquitous jet-based observables---jet multiplicity, summed scalar transverse momentum, and missing transverse momentum---have event shape counterparts that are closely correlated with their jet-based cousins. Due to their "local" computational structure, these jet-like event shapes could potentially be used for trigger-level event selection at the LHC. Intriguingly, the jet multiplicity event shape typically takes on non-integer values, highlighting the inherent ambiguity in defining jets. By inverting jet multiplicity, we show how to characterize the transverse momentum of the n-th hardest jet without actually finding the constituents of that jet. Since many physics applications do require knowledge about the jet constituents, we also build a hybrid event shape that incorporates (local) jet clustering information. As a straightforward application of our general technique, we derive an event-shape version of jet trimming, allowing event-wide jet grooming without explicit jet identification. Finally, we briefly mention possible applications of our method for jet substructure studies.

Daniele Bertolini; Tucker Chan; Jesse Thaler

2013-10-28T23:59:59.000Z

40

Observation of the Top Quark  

DOE R&D Accomplishments (OSTI)

Top quark production is observed in{bar p}p collisions at{radical}s= 1.8 TeV at the Fermilab Tevatron. The Collider Detector at Fermilab (CDF) and D{O} observe signals consistent with t{bar t} to WWb{bar b}, but inconsistent with the background prediction by 4.8{sigma} (CDF), 4.6a (D{O}). Additional evidence for the top quark Is provided by a peak in the reconstructed mass distribution. The kinematic properties of the excess events are consistent with the top quark decay. They measure the top quark mass to be 176{plus_minus}8(stat.){plus_minus}10(sys.) GeV/c{sup 2} (CDF), 199{sub -21}{sup+19}(stat.){plus_minus}22(sys.) GeV/c{sup 2} (D{O}), and the t{bar t} production cross section to be 6.8{sub -2.4}{sup+3.6}pb (CDF), 6.4{plus_minus}2.2 pb (D{O}).

Kim, S. B.

1995-08-00T23:59:59.000Z

Note: This page contains sample records for the topic "observations classroom observations" 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

Waves in the chromosphere: observations  

E-Print Network (OSTI)

I review the literature on observational aspects of waves in the solar chromosphere in the first part of this contribution. High-frequency waves are invoked to build elaborate cool-star chromosphere heating theories but have not been detected decisively so far, neither as magnetic modes in network elements nor as acoustic modes in below-the-canopy internetwork regions. Three-minute upward-propagating acoustic shocks are thoroughly established through numerical simulation as the cause of intermittent bright internetwork grains, but their pistoning and their role in the low-chromosphere energy budget remain in debate. Three-minute wave interaction with magnetic canopies is a newer interest, presently progressing through numerical simulation. Three-minute umbral flashes and running penumbral waves seem a similar acoustic-shock phenomenon awaiting numerical simulation. The low-frequency network Doppler modulation remains enigmatic. In the second part, I address low-frequency ultraviolet brightness variations of t...

Rutten, R J

2010-01-01T23:59:59.000Z

42

Aerosol Observing System (AOS) Handbook  

Science Conference Proceedings (OSTI)

The Aerosol Observing System (AOS) is a suite of in situ surface measurements of aerosol optical and cloud-forming properties. The instruments measure aerosol properties that influence the earth’s radiative balance. The primary optical measurements are those of the aerosol scattering and absorption coefficients as a function of particle size and radiation wavelength and cloud condensation nuclei (CCN) measurements as a function of percent supersaturation. Additional measurements include those of the particle number concentration and scattering hygroscopic growth. Aerosol optical measurements are useful for calculating parameters used in radiative forcing calculations such as the aerosol single-scattering albedo, asymmetry parameter, mass scattering efficiency, and hygroscopic growth. CCN measurements are important in cloud microphysical models to predict droplet formation.

Jefferson, A

2011-01-17T23:59:59.000Z

43

Observation of the sling effect  

E-Print Network (OSTI)

When cloud particles are small enough, they move with the turbulent air in the cloud. On the other hand, as particles become larger their inertia affects their motions, and they move differently than the air. These inertial dynamics impact cloud evolution and ultimately climate prediction, since clouds govern the earth's energy balances. Yet we lack a simple description of the dynamics. Falkovich et al. describes theoretically a new dynamical mechanism called the "sling effect" by which extreme events in the turbulent air cause idealized inertial cloud particles to break free from the airflow (Falkovich G, Fouxon A, Stepanov MG 2002 Nature 419, 151). The sling effect thereafter causes particle trajectories to cross each other within isolated pockets in the flow, which increases the chance of collisions that form larger particles. We combined experimental techniques that allow for precise control of a turbulent flow with three-dimensional tracking of multiple particles at unprecedented resolution. In this way, we could observe both the sling effect and crossing trajectories between real particles. We isolated the inertial sling dynamics from those caused by turbulent advection by conditionally averaging the data. We found the dynamics to be universal in terms of a local Stokes number that quantifies the local particle velocity gradients. We measured the probability density of this quantity, which shows that sharp gradients become more frequent as the global Stokes number increases. We observed that sharp compressive gradients in the airflow initiated the sling effect, and that thereafter gradients in the particle flow ran away and steepened in a way that produced singularities in the flow in finite time. During this process both the fluid motions and gravity became unimportant. The results underpin a framework for describing a crucial aspect of inertial particle dynamics.

Gregory P. Bewley; Ewe Wei Saw; Eberhard Bodenschatz

2013-12-10T23:59:59.000Z

44

Observation of GRBs with AGILE  

E-Print Network (OSTI)

Since its early phases of operation, the AGILE satellite is observing Gamma Ray Bursts (GRBs) over an energy range potentially spanning six orders of magnitude. In the hard X-ray band the SuperAGILE imager provides localization of about one GRB/month plus the detection of 1-2 GRBs per month out of its field of view. The Mini-Calorimeter detects about one GRB/week in the 350keV - 100MeV energy range, plus several other transients at very short time scales. In fact, the on-board MCAL trigger logic, implemented for the first time on time windows as short as 300 microseconds, is particularly suitable for very short bursts detection. The Gamma-Ray Imaging Detector (GRID), sensitive in the 30MeV - 30GeV range, firmly detected three GRBs (GRB080514B, GRB090401B and GRB090510) plus some other candidates at a lower significance level. Moreover, all GRBs localized by other spacecrafts inside the GRID field of view are currently searched for possible detection, and upper limits are provided. In this paper we review the ...

Marisaldi, M; Costa, E; Cutini, S; Del Monte, E; Donnarumma, I; Evangelista, Y; Feroci, M; Fuschino, F; Galli, M; Giuliani, A; Labanti, C; Lapshov, I; Lazzarotto, F; Lipari, P; Longo, F; Mereghetti, S; Moretti, E; Pacciani, L; Rapisarda, M; Soffitta, P; Tavani, M; Trifoglio, M; Vercellone, S

2009-01-01T23:59:59.000Z

45

Unsuspected Pulmonary Embolism in Observation Unit Patients  

E-Print Network (OSTI)

department observation unit. Emerg Med Clin North Am. 2001;ED) managed acute care unit on ED overcrowding and emergencyof a chest pain observation unit compared with routine care.

Limkakeng, Alexander T.; Glickman, Seth W; Cairns, Charles B; Chandra, Abhinav

2009-01-01T23:59:59.000Z

46

First Observation of Plasmarons in Graphene  

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

First Observation of Plasmarons in Graphene First Observation of Plasmarons in Graphene Print Wednesday, 30 June 2010 00:00 An international team of scientists performing...

47

Spin Observables in Kaon Electroproduction  

DOE Green Energy (OSTI)

The CEBAF accelerator at Jefferson Lab has proven to be a powerful tool for use in studying the electromagnetic production of hadronic systems containing a strange constituent quark. The electromagnetic probe only marginally disturbs the system being investigated, and is well understood. Its use as a means to probe the internal structure of hadronic systems has been well documented. Among the most studied of these hadronic systems, currently, is the nucleon. The unique opportunities afforded by the use of polarized, high-current, high-duty-factor electron beams provides an even more powerful probe of the electromagnetic structure of hadronic systems; the study of the spin dependence of the electromagnetic production and weak decay of the hyperon, specifically the {Lambda}-hyperon, becomes feasible. An experiment to study the electroproduction of the {Lambda} as a function of virtual photon momentum transfer, angle, and energy, using spin polarization observables in order to extract insights into its production and weak decay dynamics has already been approved at Jefferson Lab (E98-101; Spin Polarization in Kaon Electroproduction). The experiment aims to study the mechanism of polarization transfer in the reaction e + p {yields} e' + K + {Lambda}. The experiment requires only moderate momentum resolution and no specialized equipment other than that associated with the polarized beam. The data quality is expected to improve with higher electron beam energies, for higher Q{sup 2} measurements. Additionally, at higher energies the increased virtual photon flux allows the 4experiment to be run at lower currents (and therefore high beam polarization). A polarized electron beam and an unpolarized cryogenic hydrogen target are required. The study uses the electron arm spectrometer and the hadron arm spectrometer to detect the scattered electron and the electroproduced kaon before it decays in flight, respectively. Additionally, the hadron arm will be used to detect the proton from the hyperon decay. The hadron arm used as a hyperon tagger, in general terms, will detect the protons resulting from the weak decays of the hyperons in {Lambda} {yields} p + {pi}.

O.K. Baker

1998-06-01T23:59:59.000Z

48

The Observational?Inductive Framework for Science  

Science Conference Proceedings (OSTI)

A new observational?inductive framework for science is emerging due to recent developments in sensors

Timothy E. Eastman

2006-01-01T23:59:59.000Z

49

The Accuracy of Voluntary Observing Ships' Meteorological Observations-Results of the VSOP-NA  

Science Conference Proceedings (OSTI)

For the Voluntary Observing Ships Special Observing Project for the North Atlantic (VSOP-NA), the layout, meteorological instrumentation, and observing practices of 45 voluntary observing ships (VOS) operating in the North Atlantic were ...

Elizabeth C. Kent; Peter K. Taylor; Bruce S. Truscott; John S. Hopkins

1993-08-01T23:59:59.000Z

50

Special Emphasis Observances | Department of Energy  

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

Services » Diversity and Inclusion » Special Emphasis Observances Services » Diversity and Inclusion » Special Emphasis Observances Special Emphasis Observances The Energy Department celebrates special emphasis observances regularly, inviting guest speakers to highlight how the agency's mission benefits from diversity and inclusion. The Energy Department celebrates special emphasis observances regularly, inviting guest speakers to highlight how the agency's mission benefits from diversity and inclusion. The Department of Energy observes special days, weeks, and months as reflected in the below list of special program observances. Observances are held annually in compliance with Executive Order 11478, 29 CFR Part 1614.102(b)(4), joint Congressional Resolutions, Presidential Proclamations, and the Department's diversity and inclusion goals as

51

Near-Global Observations of Low Clouds  

Science Conference Proceedings (OSTI)

This paper analyzes several near-global datasets of low cloud cover, including the the International Satellite Cloud Climatology Project (ISCCP) satellite observations, C. J. Hahn et al. surface-derived observations, and the National Centers for ...

Bryan C. Weare

2000-04-01T23:59:59.000Z

52

Observations of a Mesoscale Ducted Gravity Wave  

Science Conference Proceedings (OSTI)

This paper reports coordinated observations of a mesoscale gravity wave made during the FRONTS 84 field experiment conducted in southwestern France in the summer of 1984. The observations were unique in the sense that all relevant wave ...

F. M. Ralph; V. Venkateswaran; M. Crochet

1993-10-01T23:59:59.000Z

53

GNSS radio occultation constellation observing system experiments  

Science Conference Proceedings (OSTI)

Observing system experiments within the operational ECMWF data assimilation framework have been performed for summer 2008 when the largest recorded number of GNSS radio occultation observations from both operational and experimental satellites ...

Peter Bauer; Gábor Radnóti; Sean Healy; Carla Cardinali

54

Observations of Irminger Sea Anticyclonic Eddies  

Science Conference Proceedings (OSTI)

Mesoscale anticyclonic eddies in the Irminger Sea are observed using a mooring and a glider. Between 2002 and 2009, the mooring observed 53 anticyclones. Using a kinematic model, objective estimates of eddy length scales and velocity structure are ...

Xue Fan; Uwe Send; Pierre Testor; Johannes Karstensen; Pascale Lherminier

2013-04-01T23:59:59.000Z

55

Statistical Design for Adaptive Weather Observations  

Science Conference Proceedings (OSTI)

Suppose that one has the freedom to adapt the observational network by choosing the times and locations of observations. Which choices would yield the best analysis of the atmospheric state or the best subsequent forecast? Here, this problem of “...

L. Mark Berliner; Zhan-Qian Lu; Chris Snyder

1999-08-01T23:59:59.000Z

56

An Ocean Observing System for Climate  

Science Conference Proceedings (OSTI)

Designs and implementation are proceeding for a Global Ocean Observing System (GOOS) and a Global Climate Observing System (GCOS). The initial design for the ocean component of the GCOS, which is also the climate module of the GOOS, was completed ...

Worth D. Nowlin Jr.; Neville Smith; George Needler; Peter K. Taylor; Robert Weller; Ray Schmitt; Liliane Merlivat; Alain Vézina; Arthur Alexiou; Michael McPhaden; Massaaki Wakatsuchi

1996-10-01T23:59:59.000Z

57

Observed Aerosol Radiative Forcings: Comparison for Natural...  

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

are from 1997, when the El Nio suppressed the rainfall in that region and biomass burning was widespread in the area. These observations are compared to those observed during...

58

The THORPEX Observation Impact Intercomparison Experiment  

Science Conference Proceedings (OSTI)

An experiment is being conducted to directly compare the impact of all assimilated observations on short-range forecast errors in different forecast systems using an adjoint-based technique. The technique allows detailed comparison of observation ...

Ronald Gelaro; Rolf H. Langland; Simon Pellerin; Ricardo Todling

2010-11-01T23:59:59.000Z

59

Observations and Modeling of Photovoltaic Responses in ...  

Science Conference Proceedings (OSTI)

About this Abstract. Meeting, Materials Science & Technology 2009. Symposium, Ferroelectrics and Multiferroics. Presentation Title, Observations and Modeling ...

60

Observation Wells (Ozkocak, 1985) | Open Energy Information  

Open Energy Info (EERE)

(Ozkocak, 1985) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Observation Wells (Ozkocak, 1985) Exploration Activity Details Location...

Note: This page contains sample records for the topic "observations classroom observations" 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

Automated Surface Observing System: Standby Power Options  

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

Automated Automated Surface Observing System Standby Options Power Automated Surface Observing System (ASOS) General System Description * Self contained group of sensors and data gathering equipment that produces an automated weather observation * Weather observations support aviation, climate data, non government weather operations, public consumption, etc. * Initial deployment began in 1991 and continued through 1997 * Located at 884 sites nationwide, normally at airports * System has two distinct subsystems: Field installed equipment (DCP & Sensor Group) and an indoor processor (ACU) with peripherals * Separate facility power for DCP & Sensors and ACU 1 * measure and collect data * Located on the airport * back up group for 10 minutes * Currently pl

62

Self-potential observations during hydraulic fracturing  

E-Print Network (OSTI)

potential measurements during hydraulic fracturing of BunterSP response during hydraulic fracturing. Citation: Moore, J.observations during hydraulic fracturing, J. Geophys. Res. ,

Moore, J R; Glaser, Steven D

2007-01-01T23:59:59.000Z

63

Aircraft S-HIS Observations during MPACE  

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

Aircraft S-HIS Observations during MPACE DeSlover, Daniel University of Wisconsin Holz, Robert University of Wisconsin, CIMMS Turner, David University of Wisconsin-Madison...

64

Observational Window Functions in Planet Transit Searches  

E-Print Network (OSTI)

Window functions describe, as a function of orbital period, the probability that an existing planetary transit is detectable in one's data for a given observing strategy. We show the dependence of this probability upon several strategy and astrophysical parameters, such as length of observing run, observing cadence, length of night, and transit duration. The ability to detect a transit is directly related to the intrinsic noise of the observations. In our simulations of the window function, we explicitly address non-correlated (gaussian or white) noise and correlated (red) noise and discuss how these two different noise components affect window functions in different manners.

Kaspar von Braun; David R. Ciardi

2007-11-27T23:59:59.000Z

65

First Observation of Plasmarons in Graphene  

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

First Observation of Plasmarons in Graphene Print An international team of scientists performing angle-resolved photoemission spectroscopy (ARPES) experiments at ALS Beamline 7.0.1...

66

Cooperative Weather Observations | Data.gov  

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

Cooperative Weather Observations Agriculture Community Menu DATA APPS EVENTS DEVELOPER STATISTICS COLLABORATE ABOUT Agriculture You are here Data.gov Communities Agriculture...

67

Observer and Particle Transformations and Newton's Laws  

E-Print Network (OSTI)

A frequently confused point in studies of symmetry violation is the distinction between observer and particle transformations. In this work, we consider a model in which a coefficient in the Standard-Model Extension leads to violations of rotation invariance in Newton's second law. The model highlights the distinction between observer and particle transformations.

T. H. Bertschinger; Natasha A. Flowers; Jay D. Tasson

2013-08-14T23:59:59.000Z

68

Towards New Platform Technology for Sustained Observations  

E-Print Network (OSTI)

of offshore oil and gas companies may make for a larger market and may help reduce costs. Docking systems such as drifting and profiling floats already complement research, survey and voluntary ships. Floats are but one. Introduction Ocean observations rely on platforms and sensors. Programs of sustained observations naturally

Griffiths, Gwyn

69

GEO Secretariat Global Earth Observing System of  

E-Print Network (OSTI)

Secretariat Vegetation greenness profiles North America Vegetation Annual Greenness Profiles 100 120 140 160;© GEO Secretariat GEO 2009-11 Work Plan ­ Related Task DA-09-05: Global Carbon Observation and Analysis System Implement a global carbon observation and analysis system addressing the three components

70

Arctic Lower Troposphere Observed Structure (ALTOS)  

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

Lower Troposphere Observed Structure (ALTOS) Lower Troposphere Observed Structure (ALTOS) will raise and lower a heavily instrumented tethered balloon system at regular intervals in the lower 2 kilometers of the atmosphere at Oliktok Point. Data obtained during the ALTOS campaign will provide a statistically significant set of observed in situ cloud properties for validating retrieval algorithms and help scientists reduce the uncertainty in the radiative forcing and heating rates on hourly time scales. The data will also help researchers gain a better understanding of the driving processes that control climate changes and determine the state of the Arctic climate system. Collaborators Science Team: The Pennsylvania State University, Stratton

71

First Direct Observation of Spinons and Holons  

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

First Direct Observation of Spinons and Holons Print First Direct Observation of Spinons and Holons Print Spin and charge are inseparable traits of an electron, but in one-dimensional solids, a 40-year-old theory predicts their separation into "collective" modes-as independent excitation quanta called spinons and holons. Angle-resolved photoemission spectroscopy (ARPES) should provide the most direct evidence of this spin-charge separation, as the single quasiparticle peak splits into a spinon-holon two-peak structure. However, despite extensive ARPES experiments, the unambiguous observation of the two-peak structure has remained elusive. Working at the ALS, a team of researchers from Korea, Japan, and the U.S. has now observed electron spin-charge separation in a one-dimensional solid. These results hold implications for future developments in several key areas of advanced technology, including high-temperature superconductors, nanowires, and spintronics.

72

First Observation of Plasmarons in Graphene  

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

First Observation of Plasmarons First Observation of Plasmarons in Graphene First Observation of Plasmarons in Graphene Print Wednesday, 30 June 2010 00:00 An international team of scientists performing angle-resolved photoemission spectroscopy (ARPES) experiments at ALS Beamline 7.0.1 have found that composite particles called plasmarons play a vital role in determining graphene's properties. A plasmaron consists of a charge carrier (electron or hole) coupled with a plasmon-an electron density wave. Although plasmarons were proposed theoretically in the late 1960s, and indirect evidence of them has been found, this work is the first observation of their distinct energy bands in graphene, or indeed in any material. The discovery may hasten the day when graphene can be used for "plasmonics" to build ultrafast computers-perhaps even room-temperature quantum computers-plus a wide range of other tools and applications.

73

First Direct Observation of Spinons and Holons  

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

First Direct Observation of Spinons and Holons Print First Direct Observation of Spinons and Holons Print Spin and charge are inseparable traits of an electron, but in one-dimensional solids, a 40-year-old theory predicts their separation into "collective" modes-as independent excitation quanta called spinons and holons. Angle-resolved photoemission spectroscopy (ARPES) should provide the most direct evidence of this spin-charge separation, as the single quasiparticle peak splits into a spinon-holon two-peak structure. However, despite extensive ARPES experiments, the unambiguous observation of the two-peak structure has remained elusive. Working at the ALS, a team of researchers from Korea, Japan, and the U.S. has now observed electron spin-charge separation in a one-dimensional solid. These results hold implications for future developments in several key areas of advanced technology, including high-temperature superconductors, nanowires, and spintronics.

74

Globally Gridded Satellite Observations for Climate Studies  

Science Conference Proceedings (OSTI)

Geostationary satellites have provided routine, high temporal resolution Earth observations since the 1970s. Despite the long period of record, use of these data in climate studies has been limited for numerous reasons, among them that no central archive ...

Kenneth R. Knapp; Steve Ansari; Caroline L. Bain; Mark A. Bourassa; Michael J. Dickinson; Chris Funk; Chip N. Helms; Christopher C. Hennon; Christopher D. Holmes; George J. Huffman; James P. Kossin; Hai-Tien Lee; Alexander Loew; Gudrun Magnusdottir

2011-07-01T23:59:59.000Z

75

Observing Surf-Zone Dispersion with Drifters  

Science Conference Proceedings (OSTI)

Surf-zone dispersion is studied using drifter observations collected within about 200 m of the shoreline (at depths of less than about 5 m) on a beach with approximately alongshore uniform bathymetry and waves. There were about 70 individual ...

Matthew Spydell; Falk Feddersen; R. T. Guza; W. E. Schmidt

2007-12-01T23:59:59.000Z

76

Surface Observations in the Hurricane Environment  

Science Conference Proceedings (OSTI)

Composite analyses of marine surface observations from 37 hurricanes between 1975 and 1998 show that the difference between the sea surface temperature and the surface air temperature significantly increases just outside the hurricane inner core. ...

Joseph J. Cione; Peter G. Black; Samuel H. Houston

2000-05-01T23:59:59.000Z

77

Observations and Mechanisms of GATE Waterspouts  

Science Conference Proceedings (OSTI)

The GATE data base for days 261 and 186 is used for a combined observational and numerical investigation of interacting cumulus processes that may be important in the generation of waterspouts. The results suggest that the existence of cumulus-...

Joanne Simpson; Bruce R. Morton; Michael C. McCumber; Richard S. Penc

1986-04-01T23:59:59.000Z

78

Observations of the Diurnal Tide from Space  

Science Conference Proceedings (OSTI)

This study presents a climatology of mesospheric and lower-thermospheric diurnal tidal winds obtained with the High Resolution Doppler Imager (HRDI) on the Upper Atmosphere Research Satellite (UARS). The observations reveal that although tidal ...

Paul B. Hays; D. L. Wu; The HRDI Science Team

1994-10-01T23:59:59.000Z

79

Coordinated Enhanced Observing Period (CEOP) International Workshop  

Science Conference Proceedings (OSTI)

The Coordinated Enhanced Observing Period (CEOP) International Workshop, sponsored by NOAA Office of Global Programs and NASA Land Surface Hydrology Program, was held on 27 February 1 March 2001 at NASA's Goddard Space Flight Center, Greenbelt, ...

Michael G. Bosilovich; Rick Lawford

2002-10-01T23:59:59.000Z

80

Observations of the Evolution of Orogenic Blocking  

Science Conference Proceedings (OSTI)

The evolution of low-level flow upstream of the Continental Divide (Rocky Mountains) and the Wasatch Range from being unable to surmount the mountain range, to becoming unblocked and blocked again is studied observationally. During two months in ...

Georg J. Mayr; Thomas B. McKee

1995-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "observations classroom observations" 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

Principal Component Analysis of Wind Profiler Observations  

Science Conference Proceedings (OSTI)

Principal component analysis (PCA) is applied to wind profiler observations to study the vertical profile of the wind field and its temporal evolution. The rationale for decomposing time–height wind profiler data using PCA is twofold. The ...

Christopher R. Williams

1997-06-01T23:59:59.000Z

82

A Mobile Mesonet for Finescale Meteorological Observations  

Science Conference Proceedings (OSTI)

A mobile weather observing system (mobile mesonet) was designed to augment existing meteorological networks in the study of severe local storms and other mesoscale weather phenomena in conjunction with the Verification of the Origins of Rotation ...

Jerry M. Straka; Erik N. Rasmussen; Sherman E. Fredrickson

1996-10-01T23:59:59.000Z

83

Surface Temperature Observations from AVHRR in FIFE  

Science Conference Proceedings (OSTI)

Observations of the surface radiometric temperature by the AVHRR sensor on board the NOAA-9 satellite during the First ISLSCP (International Satellite Land Surface Climatology Project) Field Experiment conducted in central Kansas during 1987 are ...

T. J. Schmugge; G. M. Schmidt

1998-04-01T23:59:59.000Z

84

Observations of Breaking Surface Wave Statistics  

Science Conference Proceedings (OSTI)

Breaking surface waves were observed during the Surface Wave Process Program with a novel acoustical instrument that makes use of underwater ambient sound to track individual breaking events. The spatial and temporal statistics of braking waves ...

Li Ding; David M. Farmer

1994-06-01T23:59:59.000Z

85

Estimation of Convective Rainfall from Lightning Observations  

Science Conference Proceedings (OSTI)

The objective of this study is to develop a technique to use lightning observations for estimating convective rainfall. A framework for rainfall estimation is developed in which key elements are 1) the rainfall–lightning ratio, that is, the ...

Alberto Tapia; James A. Smith; Michael Dixon

1998-11-01T23:59:59.000Z

86

Filtering Turbulent Sparsely Observed Geophysical Flows  

Science Conference Proceedings (OSTI)

Filtering sparsely turbulent signals from nature is a central problem of contemporary data assimilation. Here, sparsely observed turbulent signals from nature are generated by solutions of two-layer quasigeostrophic models with turbulent cascades ...

John Harlim; Andrew J. Majda

2010-04-01T23:59:59.000Z

87

SLAC National Accelerator Laboratory - CERN: Experiments Observe...  

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

CERN: Experiments Observe Particle Consistent with Long-sought Higgs Boson July 5, 2012 from CERN At a seminar held at CERN as a curtain raiser to the year's major particle physics...

88

Scatterometer Observations at High Wind Speeds  

Science Conference Proceedings (OSTI)

Satellite scatterometer winds are commonly validated by comparing them to buoy observations and/or numerical model surface wind analyses. However, the empirical scatterometer algorithm (geophysical model function) has been calibrated against a ...

Lixin Zeng; Robert A. Brown

1998-11-01T23:59:59.000Z

89

MODELING OBSERVATIONAL CONSTRAINTS FOR DARK MATTER HALOS  

SciTech Connect

Observations show that the underlying rotation curves at intermediate radii in spiral and low-surface-brightness galaxies are nearly universal. Further, in these same galaxies, the product of the central density and the core radius ({rho}{sub 0} r{sub 0}) is constant. An empirically motivated model for dark matter halos that incorporates these observational constraints is presented and shown to be in accord with the observations. A model fit to the observations of the galaxy cluster A611 shows that {rho}{sub 0} r{sub 0} for the dark matter halo in this more massive structure is larger by a factor of {approx}20 over that assumed for the galaxies. The model maintains the successful Navarro-Frenk-White form in the outer regions, although the well-defined differences in the inner regions suggest that modifications to the standard cold dark matter picture are required.

Hartwick, F. D. A. [Department of Physics and Astronomy, University of Victoria, Victoria, BC V8W 3P6 (Canada)

2012-12-01T23:59:59.000Z

90

The Duke University Helicopter Observation Platform  

Science Conference Proceedings (OSTI)

To establish a helicopter observation platform (HOP), Duke University has purchased a Bell 206 “Jet Ranger” helicopter, which has been equipped with a three-dimensional, high-frequency positioning and attitude-recording system, a data acquisition ...

Roni Avissar; Heidi E. Holder; Nathan Abehserra; M. Adam Bolch; Patrick Canning; Jose Magalhaes; Robert L. Walko; K. Novick; G. Katul; Katya Prince; Naoki Matayoshi; Kristina M. Johnson

2009-07-01T23:59:59.000Z

91

First Direct Observation of Spinons and Holons  

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

two-peak structure has remained elusive. Working at the ALS, a team of researchers from Korea, Japan, and the U.S. has now observed electron spin-charge separation in a...

92

Communications in the observation limited regime  

E-Print Network (OSTI)

We consider the design of communications systems when the principal cost is observing the channel, as opposed to transmit energy per bit or spectral efficiency. This is motivated by energy constrained communications devices ...

Bhardwaj, Manish, 1976-

2009-01-01T23:59:59.000Z

93

The Autocorrelation of Hourly Wind Speed Observations  

Science Conference Proceedings (OSTI)

The autocorrelation of hourly wind speed observations is estimated for seven stations on the west coast of Canada at selected lags ranging from one hour to two months. The estimated autocorrelation function is fitted by a model that includes a ...

Arthur C. Brett; Stanton E. Tuller

1991-06-01T23:59:59.000Z

94

Multisensor Observation of an Atmospheric Undular Bore  

Science Conference Proceedings (OSTI)

A detailed and unique multisensor observation of an undular bore is presented. The data include those from rawinsonde, satellite, two Doppler radars, and a tall instrumented tower. Noteworthy are Doppler radar images that resolve the wave's ...

Pravas R. Mahapatra; Richard J. Doviak; Dusan S. Zrni?

1991-10-01T23:59:59.000Z

95

Freezing Rain: An Observational and Theoretical Study  

Science Conference Proceedings (OSTI)

Data from a Doppler radar, an instrumented aircraft, and several rawinsonde observations during freezing rain and ice pellet events have been analyzed for this study. From these data, 34 soundings were obtained that characterized the vertical ...

Ryan J. Zerr

1997-12-01T23:59:59.000Z

96

First Direct Observation of Spinons and Holons  

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

First Direct Observation of Spinons and Holons Print First Direct Observation of Spinons and Holons Print Spin and charge are inseparable traits of an electron, but in one-dimensional solids, a 40-year-old theory predicts their separation into "collective" modes-as independent excitation quanta called spinons and holons. Angle-resolved photoemission spectroscopy (ARPES) should provide the most direct evidence of this spin-charge separation, as the single quasiparticle peak splits into a spinon-holon two-peak structure. However, despite extensive ARPES experiments, the unambiguous observation of the two-peak structure has remained elusive. Working at the ALS, a team of researchers from Korea, Japan, and the U.S. has now observed electron spin-charge separation in a one-dimensional solid. These results hold implications for future developments in several key areas of advanced technology, including high-temperature superconductors, nanowires, and spintronics.

97

Targeted Observations with an Airborne Wind Lidar  

Science Conference Proceedings (OSTI)

This study investigates the possibilities and limitations of airborne Doppler lidar for adaptive observations over the Atlantic Ocean. For the first time, a scanning 2-?m Doppler lidar was applied for targeted measurements during the Atlantic “...

M. Weissmann; R. Busen; A. Dörnbrack; S. Rahm; O. Reitebuch

2005-11-01T23:59:59.000Z

98

Experimental observation of a complex periodic window  

E-Print Network (OSTI)

The existence of a special periodic window in the two-dimensional parameter space of an experimental Chua's circuit is reported. One of the main reasons that makes such a window special is that the observation of one implies that other similar periodic windows must exist for other parameter values. However, such a window has never been experimentally observed, since its size in parameter space decreases exponentially with the period of the periodic attractor. This property imposes clear limitations for its experimental detection.

D. M. Maranhão; M. S. Baptista; J. C. Sartorelli; I. L. Caldas

2007-12-22T23:59:59.000Z

99

Have Atmospheric Cerenkov Telescopes Observed Dark Matter?  

E-Print Network (OSTI)

Two ground-based experiments have recently independently detected TeV $\\gamma$-rays from the direction of the Galactic center. The observations made by the VERITAS and CANGAROO collaborations are unexpected, although not impossible to interpret in terms of astrophysical sources. Here we examine in detail whether the observed $\\gamma$-rays may arise from the more exotic alternative of annihilations of dark matter particles clustered in the center of the Galaxy.

Dan Hooper; Ignacio de la Calle Perez; Joseph Silk; Francesc Ferrer; Subir Sarkar

2004-04-09T23:59:59.000Z

100

Assessment of the Impact of Observations on Analyses Derived from Observing System Experiments  

Science Conference Proceedings (OSTI)

Observing system experiments (OSEs) are commonly used to quantify the impact of different observation types on forecasts produced by a specific numerical weather prediction system. Recently, methods based on degree of freedom for signal (DFS) have ...

Cristina Lupu; Pierre Gauthier; Stéphane Laroche

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "observations classroom observations" 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

The web-PLOP observation prioritisation system  

E-Print Network (OSTI)

We present a description of the automated system used by RoboNet to prioritise follow up observations of microlensing events to search for planets. The system keeps an up-to-date record of all public data from OGLE and MOA together with any existing RoboNet data and produces new PSPL fits whenever new data arrives. It then uses these fits to predict the current or future magnitudes of events, and selects those to observe which will maximise the probability of detecting planets for a given telescope and observing time. The system drives the RoboNet telescopes automatically based on these priorities, but it is also designed to be used interactively by human observers. The prioritisation options, such as telescope/instrument parameters, observing conditions and available time can all be controlled via a web-form, and the output target list can also be customised and sorted to show the parameters that the user desires. The interactive interface is available at http://www.artemis-uk.org/web-PLOP/

Colin Snodgrass; Yiannis Tsapras; Rachel Street; Daniel Bramich; Keith Horne; Martin Dominik; Alasdair Allan

2008-05-14T23:59:59.000Z

102

OBSERVING CORONAL NANOFLARES IN ACTIVE REGION MOSS  

SciTech Connect

The High-resolution Coronal Imager (Hi-C) has provided Fe XII 193A images of the upper transition region moss at an unprecedented spatial ({approx}0.''3-0.''4) and temporal (5.5 s) resolution. The Hi-C observations show in some moss regions variability on timescales down to {approx}15 s, significantly shorter than the minute-scale variability typically found in previous observations of moss, therefore challenging the conclusion of moss being heated in a mostly steady manner. These rapid variability moss regions are located at the footpoints of bright hot coronal loops observed by the Solar Dynamics Observatory/Atmospheric Imaging Assembly in the 94 A channel, and by the Hinode/X-Ray Telescope. The configuration of these loops is highly dynamic, and suggestive of slipping reconnection. We interpret these events as signatures of heating events associated with reconnection occurring in the overlying hot coronal loops, i.e., coronal nanoflares. We estimate the order of magnitude of the energy in these events to be of at least a few 10{sup 23} erg, also supporting the nanoflare scenario. These Hi-C observations suggest that future observations at comparable high spatial and temporal resolution, with more extensive temperature coverage, are required to determine the exact characteristics of the heating mechanism(s).

Testa, Paola; DeLuca, Ed; Golub, Leon; Korreck, Kelly; Weber, Mark [Smithsonian Astrophysical Observatory, 60 Garden street, MS 58, Cambridge, MA 02138 (United States); De Pontieu, Bart; Martinez-Sykora, Juan; Title, Alan [Lockheed Martin Solar and Astrophysics Lab, Org. A021S, Bldg. 252, 3251 Hanover Street, Palo Alto, CA 94304 (United States); Hansteen, Viggo [Institute of Theoretical Astrophysics, University of Oslo, P.O. Box 1029 Blindern, N-0315 Oslo (Norway); Cirtain, Jonathan; Winebarger, Amy; Kobayashi, Ken [NASA Marshall Space Flight Center, ZP 13, Huntsville, AL 35812 (United States); Kuzin, Sergey [P. N. Lebedev Physical institute of the Russian Academy of Sciences, Leninskii prospekt, 53, 119991 Moscow (Russian Federation); Walsh, Robert [University of Central Lancashire, Lancashire, Preston PR1 2HE (United Kingdom); DeForest, Craig, E-mail: ptesta@cfa.harvard.edu [Southwest Research Institute, 1050 Walnut Street, Suite 300, Boulder, CO 80302 (United States)

2013-06-10T23:59:59.000Z

103

Anatahan, Northern Mariana Islands- Reconnaissance Geological Observations  

Open Energy Info (EERE)

Anatahan, Northern Mariana Islands- Reconnaissance Geological Observations Anatahan, Northern Mariana Islands- Reconnaissance Geological Observations During And After The Volcanic Crisis Of Spring 1990, And Monitoring Prior To The May 2003 Eruption Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Anatahan, Northern Mariana Islands- Reconnaissance Geological Observations During And After The Volcanic Crisis Of Spring 1990, And Monitoring Prior To The May 2003 Eruption Details Activities (0) Areas (0) Regions (0) Abstract: Anatahan island is 9.5 km east-west by 3.5 km north-south and truncated by an elongate caldera 5 km east-west by 2.5 km north-south. A steep-walled pit crater ~1 km across and ~200 m deep occupies the eastern part of the caldera. The island is the summit region of a mostly submarine stratovolcano. The oldest subaerial rocks (stage 1) are exposed low on the

104

Observing AAPI Heritage Month | Department of Energy  

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

Observing AAPI Heritage Month Observing AAPI Heritage Month Observing AAPI Heritage Month May 1, 2012 - 4:42pm Addthis Bill Valdez Bill Valdez Principal Deputy Director What are the key facts? President Obama has also appointed a historic number of highly qualified Asian Americans and Pacific Islanders to senior positions in his Administration Throughout May,the White House Initiative on Asian Americans and Pacific Islanders will be sharing the many ways in which the Obama Administration has helped the Asian American and Pacific Islander community. White House Initiative on Asian Americans and Pacific Islanders Editor's Note: This blog originally appeared on the White House Blog, and is authored by Chris Lu, Assistant to the President and Cabinet Secretary. He is also the Co-Chair of the White House Initiative on Asian

105

First Observation of Plasmarons in Graphene  

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

First Observation of Plasmarons in Graphene Print First Observation of Plasmarons in Graphene Print An international team of scientists performing angle-resolved photoemission spectroscopy (ARPES) experiments at ALS Beamline 7.0.1 have found that composite particles called plasmarons play a vital role in determining graphene's properties. A plasmaron consists of a charge carrier (electron or hole) coupled with a plasmon-an electron density wave. Although plasmarons were proposed theoretically in the late 1960s, and indirect evidence of them has been found, this work is the first observation of their distinct energy bands in graphene, or indeed in any material. The discovery may hasten the day when graphene can be used for "plasmonics" to build ultrafast computers-perhaps even room-temperature quantum computers-plus a wide range of other tools and applications.

106

First Observation of Plasmarons in Graphene  

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

First Observation of Plasmarons in Graphene Print First Observation of Plasmarons in Graphene Print An international team of scientists performing angle-resolved photoemission spectroscopy (ARPES) experiments at ALS Beamline 7.0.1 have found that composite particles called plasmarons play a vital role in determining graphene's properties. A plasmaron consists of a charge carrier (electron or hole) coupled with a plasmon-an electron density wave. Although plasmarons were proposed theoretically in the late 1960s, and indirect evidence of them has been found, this work is the first observation of their distinct energy bands in graphene, or indeed in any material. The discovery may hasten the day when graphene can be used for "plasmonics" to build ultrafast computers-perhaps even room-temperature quantum computers-plus a wide range of other tools and applications.

107

BNL | Mobile Aerosol Observing System (MAOS)  

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

Mobile Aerosol Observing System (MAOS) Mobile Aerosol Observing System (MAOS) The Mobile Aerosol Observing System (MAOS) is a platform and instrument suite for Intensive Operation Periods (IOPs) to conduct in situ measurements of aerosols and their precursors. MAOS is part of the ARM Climate Research Facility. Physically MAOS is contained in two 20' SeaTainers custom adapted to provide a sheltered laboratory environment for operators and instruments even under harsh conditions. The two structures are designated MAOS-A and MAOS-C for Aerosol and Chemistry respectively. Although independent, with separate data systems, inlets and power distribution, the two structures are normally a single operating unit. The two enclosures comprising MAOS are designed for rapid deployment. All components (except for the Radar Wind Profiler) are transported internally

108

First Observation of Plasmarons in Graphene  

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

First Observation of Plasmarons in Graphene Print First Observation of Plasmarons in Graphene Print An international team of scientists performing angle-resolved photoemission spectroscopy (ARPES) experiments at ALS Beamline 7.0.1 have found that composite particles called plasmarons play a vital role in determining graphene's properties. A plasmaron consists of a charge carrier (electron or hole) coupled with a plasmon-an electron density wave. Although plasmarons were proposed theoretically in the late 1960s, and indirect evidence of them has been found, this work is the first observation of their distinct energy bands in graphene, or indeed in any material. The discovery may hasten the day when graphene can be used for "plasmonics" to build ultrafast computers-perhaps even room-temperature quantum computers-plus a wide range of other tools and applications.

109

Observations of the Askaryan Effect in Ice  

E-Print Network (OSTI)

We report on the first observations of the Askaryan effect in ice: coherent impulsive radio Cherenkov radiation from the charge asymmetry in an electromagnetic (EM) shower. Such radiation has been observed in silica sand and rock salt, but this is the first direct observation from an EM shower in ice. These measurements are important since the majority of experiments to date that rely on the effect for ultra-high energy neutrino detection are being performed using ice as the target medium. As part of the complete validation process for the Antarctic Impulsive Transient Antenna (ANITA) experiment, we performed an experiment at the Stanford Linear Accelerator Center (SLAC) in June 2006 using a 7.5 metric ton ice target, yielding results fully consistent with theoretical expectations.

ANITA collaboration; P. W. Gorham; S. W. Barwick; J. J. Beatty; D. Z. Besson; W. R. Binns; C. Chen; P. Chen; J. M. Clem; A. Connolly; P. F. Dowkontt; M. A. DuVernois; R. C. Field; D. Goldstein; A. Goodhue; C. Hast; C. L. Hebert; S. Hoover; M. H. Israel; J. Kowalski; J. G. Learned; K. M. Liewer; J. T. Link; E. Lusczek; S. Matsuno; B. Mercurio; C. Miki; P. Miocinovic; J. Nam; C. J. Naudet; J. Ng; R. Nichol; K. Palladino; K. Reil; A. Romero-Wolf; M. Rosen; D. Saltzberg; D. Seckel; G. S. Varner; D. Walz; F. Wu

2006-11-03T23:59:59.000Z

110

Observations of the Askaryan Effect in Ice  

SciTech Connect

We report on the first observations of the Askaryan effect in ice: coherent impulsive radio Cherenkov radiation from the charge asymmetry in an electromagnetic (EM) shower. Such radiation has been observed in silica sand and rock salt, but this is the first direct observation from an EM shower in ice. These measurements are important since the majority of experiments to date that rely on the effect for ultra-high energy neutrino detection are being performed using ice as the target medium. As part of the complete validation process for the Antarctic Impulsive Transient Antenna (ANITA) experiment, we performed an experiment at the Stanford Linear Accelerator Center (SLAC) in June 2006 using a 7.5 metric ton ice target, yielding results fully consistent with theoretical expectations.

Gorham, P.W.

2007-01-16T23:59:59.000Z

111

Workshop on observations of recent comets (1990)  

Science Conference Proceedings (OSTI)

Potential interpretations are presented for observations of four comets: Brorsen-Metcalf (1989o), Okazaki-Levy-Rudenko (1989r), Aarseth-Brewington (1989a1), and Austin (1989o1). The relationship of minor species with each other and possible parents as well as with dust are being pursued in a number of investigations. Of particular interest are the abundance ratios of CH{sub 4} to CO and NH{sub 3} to N{sub 2}. The need for closer collaboration betwen observing teams and modelers is examined. The need for dust size distribution as a function of cometocentric distance to be analyzed in closer collaboration between observers and modelers is discussed.

Huebner, W.F.; Wehinger, P.A.; Rahe, J.; Konno, I.

1990-01-01T23:59:59.000Z

112

First Observation of Plasmarons in Graphene  

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

First Observation of Plasmarons in Graphene Print First Observation of Plasmarons in Graphene Print An international team of scientists performing angle-resolved photoemission spectroscopy (ARPES) experiments at ALS Beamline 7.0.1 have found that composite particles called plasmarons play a vital role in determining graphene's properties. A plasmaron consists of a charge carrier (electron or hole) coupled with a plasmon-an electron density wave. Although plasmarons were proposed theoretically in the late 1960s, and indirect evidence of them has been found, this work is the first observation of their distinct energy bands in graphene, or indeed in any material. The discovery may hasten the day when graphene can be used for "plasmonics" to build ultrafast computers-perhaps even room-temperature quantum computers-plus a wide range of other tools and applications.

113

PRECISION POINTING OF IBEX-Lo OBSERVATIONS  

SciTech Connect

Post-launch boresight of the IBEX-Lo instrument on board the Interstellar Boundary Explorer (IBEX) is determined based on IBEX-Lo Star Sensor observations. Accurate information on the boresight of the neutral gas camera is essential for precise determination of interstellar gas flow parameters. Utilizing spin-phase information from the spacecraft attitude control system (ACS), positions of stars observed by the Star Sensor during two years of IBEX measurements were analyzed and compared with positions obtained from a star catalog. No statistically significant differences were observed beyond those expected from the pre-launch uncertainty in the Star Sensor mounting. Based on the star observations and their positions in the spacecraft reference system, pointing of the IBEX satellite spin axis was determined and compared with the pointing obtained from the ACS. Again, no statistically significant deviations were observed. We conclude that no systematic correction for boresight geometry is needed in the analysis of IBEX-Lo observations to determine neutral interstellar gas flow properties. A stack-up of uncertainties in attitude knowledge shows that the instantaneous IBEX-Lo pointing is determined to within {approx}0.{sup 0}1 in both spin angle and elevation using either the Star Sensor or the ACS. Further, the Star Sensor can be used to independently determine the spacecraft spin axis. Thus, Star Sensor data can be used reliably to correct the spin phase when the Star Tracker (used by the ACS) is disabled by bright objects in its field of view. The Star Sensor can also determine the spin axis during most orbits and thus provides redundancy for the Star Tracker.

Hlond, M.; Bzowski, M. [Space Research Centre of the Polish Academy of Sciences, 18A Bartycka, 00-716 Warsaw (Poland); Moebius, E.; Kucharek, H.; Heirtzler, D.; Schwadron, N. A.; Neill, M. E. O'; Clark, G. [Space Science Center and Department of Physics, University of New Hampshire, Morse Hall, 8 College Road, Durham, NH 03824 (United States); Crew, G. B. [Haystack Observatory, Massachusetts Institute of Technology, Route 40, Westford, MA 01886 (United States); Fuselier, S. [Lockheed Martin, Space Physics Lab, 3251 Hanover Street, Palo Alto, CA 94304 (United States); McComas, D. J., E-mail: mhlond@cbk.waw.pl, E-mail: eberhard.moebius@unh.edu, E-mail: gbc@haystack.mit.edu, E-mail: stephen.a.fuselier@linco.com, E-mail: DMcComas@swri.edu, E-mail: DMcComas@swri.edu [Southwest Research Institute, P.O. Drawer 28510, San Antonio, TX 78228 (United States)

2012-02-01T23:59:59.000Z

114

Towards a dynamical theory of observation  

E-Print Network (OSTI)

We introduce a model of classical and quantum observation based on contextuality and dynamically evolving apparatus. Power sets of classical bits model the four classical states of elementary detectors, viz. the two normal yes/no signal states, the faulty or decommissioned state and the non-existence state. Operators over power set registers are used to describe various physical scenarios such as the construction and decommissioning of physical devices in otherwise empty laboratories, the dynamics of signal states over those detectors, the extraction of information from those states, and multiple observers. We apply our quantum formalism to the Elitzur-Vaidman bomb-tester experiment and the Hardy paradox experiment.

George Jaroszkiewicz

2008-12-16T23:59:59.000Z

115

Arithmetic, mutually unbiased bases and complementary observables  

Science Conference Proceedings (OSTI)

Complementary observables in quantum mechanics may be viewed as Frobenius structures in a dagger monoidal category, such as the category of finite dimensional Hilbert spaces over the complex numbers. On the other hand, their properties crucially depend on the discrete Fourier transform and its associated quantum torus, requiring only the finite fields that underlie mutually unbiased bases. In axiomatic topos theory, the complex numbers are difficult to describe and should not be invoked unnecessarily. This paper surveys some fundamentals of quantum arithmetic using finite field complementary observables, with a view considering more general axiom systems.

Sheppeard, M. D. [Oxford University Computing Laboratory, Wolfson Building, Parks Rd., Oxford OX1 3QD (United Kingdom)

2010-02-15T23:59:59.000Z

116

TABLE OF CONTENTS SECTION A: PREINTERVIEW OBSERVATION  

U.S. Energy Information Administration (EIA) Indexed Site

TABLE OF CONTENTS TABLE OF CONTENTS SECTION A: PREINTERVIEW OBSERVATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 SECTION B: HOUSING TYPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 SECTION C: HOME HEATING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 SECTION D: AIR CONDITIONING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 SECTION E: WATER HEATING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 SECTION F: LIGHTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 SECTION G: APPLIANCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Cooking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Refrigerators and Freezers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

117

Observing SQL queries in their natural habitat  

Science Conference Proceedings (OSTI)

We describe Habitat, a declarative observational debugger for SQL. Habitat facilitates true language-level (not: plan-level) debugging of, probably flawed, SQL queries that yield unexpected results. Users mark SQL subexpressions ... Keywords: Declarative debugging, SQL, query languages, relational databases

Torsten Grust; Jan Rittinger

2013-04-01T23:59:59.000Z

118

Fermi Observations of Gamma?ray Bursts  

Science Conference Proceedings (OSTI)

The gamma?ray emission mechanism of Gamma?ray bursts (GRBs) are still unknown. Fermi Gamma?ray Space Telescope successfully detected high?energy (> 100 MeV) emission from 17 GRBs since its launch. Fermi revealed the distinct temporal behaviors and extra spectral component from high?energy emission. These new observational results are driving many theoretical implications

Masanori Ohno; The Fermi?LAT collaborations; The GBM collaborations

2010-01-01T23:59:59.000Z

119

Bell-type inequalities for arbitrary observables  

E-Print Network (OSTI)

We derive a Bell-type inequality for observables with arbitrary spectra. For the case of continuous variable systems we propose a possible experimental violation of this inequality, by using squeezed light and homodyne detection together with methods of quantum-state reconstruction. It is shown that the violation is also possible for realistic detection efficiencies.

E. Shchukin W. Vogel

2009-02-23T23:59:59.000Z

120

A Typhoon Observed with the MU Radar  

Science Conference Proceedings (OSTI)

During the passage of Typhoon 8719 a 60-h continuous observation was made of the troposphere and the lower stratosphere with the MU (middle and upper atmosphere) radar. Height profiles of the wind velocity vector were measured every 2.5 min with ...

Toru Sato; Naoki Ao; Mamoru Yamamoto; Shoichiro Fukao; Toshitaka Tsuda; Susumu Kato

1991-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "observations classroom observations" 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

Hadley Cell Widening: Model Simulations versus Observations  

Science Conference Proceedings (OSTI)

Observations show that the Hadley cell has widened by about 2°–5° since 1979. This widening and the concomitant poleward displacement of the subtropical dry zones may be accompanied by large-scale drying near 30°N and 30°S. Such drying poses a ...

Celeste M. Johanson; Qiang Fu

2009-05-01T23:59:59.000Z

122

Negative Energy Seen By Accelerated Observers  

E-Print Network (OSTI)

The sampled negative energy density seen by inertial observers, in arbitrary quantum states is limited by quantum inequalities, which take the form of an inverse relation between the magnitude and duration of the negative energy. The quantum inequalities severely limit the utilization of negative energy to produce gross macroscopic effects, such as violations of the second law of thermodynamics. The restrictions on the sampled energy density along the worldlines of accelerated observers are much weaker than for inertial observers. Here we will illustrate this with several explicit examples. We consider the worldline of a particle undergoing sinusoidal motion in space in the presence of a single mode squeezed vacuum state of the electromagnetic field. We show that it is possible for the integrated energy density along such a worldline to become arbitrarily negative at a constant average rate. Thus the averaged weak energy condition is violated in these examples.This can be the case even when the particle moves at non-relativistic speeds. We use the Raychaudhuri equation to show that there can be net defocussing of a congruence of these accelerated worldlines. This defocussing is an operational signature of the negative integrated energy density. These results in no way invalidate nor undermine either the validity or utility of the quantum inequalities for inertial observers. In particular, they do not change previous constraints on the production of macroscopic effects with negative energy, e.g., the maintenance of traversable wormholes.

L. H. Ford; Thomas A. Roman

2013-02-12T23:59:59.000Z

123

Comparing Two Approaches for Assessing Observation Impact  

Science Conference Proceedings (OSTI)

Langland and Baker introduced an approach to assess the impact of observations on the forecasts. In that approach, a state-space aspect of the forecast is defined and a procedure is derived ultimately relating changes in the aspect with changes in ...

Ricardo Todling

2013-05-01T23:59:59.000Z

124

Observational Constraints on Open Inflation Models  

E-Print Network (OSTI)

We discuss observational constraints on models of open inflation. Current data from large-scale structure and the cosmic microwave background prefer models with blue spectra and/or Omega_0 >= 0.3--0.5. Models with minimal anisotropy at large angles are strongly preferred.

Martin White; Joe Silk

1996-08-27T23:59:59.000Z

125

Theory of cooling neutron stars versus observations  

E-Print Network (OSTI)

We review current state of neutron star cooling theory and discuss the prospects to constrain the equation of state, neutrino emission and superfluid properties of neutron star cores by comparing the cooling theory with observations of thermal radiation from isolated neutron stars.

Yakovlev, D G; Kaminker, A D; Potekhin, A Yu

2007-01-01T23:59:59.000Z

126

Lidar Observations of Ship Spray Plumes  

Science Conference Proceedings (OSTI)

As part of the Monterey Area Ship Track experiment, which was designed to study ship-generated cloud tracks, ship-based measurements were made by a gyroscopically stabilized scanning lidar system. This paper focuses on the spray plume observed by ...

William P. Hooper; Jeffrey E. James

2000-08-01T23:59:59.000Z

127

GOES Observation of a Rapidly Melting Snowband  

Science Conference Proceedings (OSTI)

GOES observation of rapid dissipation of a 5–10 cm (2–4 inches) depth snowband over the central and upper Mississippi River valley on 15 April 1980 is presented. Differences in the local weather between the stations with and without melting snow ...

Carlyle H. Wash; Delain A. Edman; John Zapotocny

1981-06-01T23:59:59.000Z

128

DOW Radar Observations of Wind Farms  

Science Conference Proceedings (OSTI)

The growth of the wind industry in recent years has motivated investigation into wind farm interference with the operation of the nationwide Weather Surveillance Radar-1988 Doppler (WSR-88D) network. Observations of a wind farm were taken with a Doppler ...

Mallie Toth; Erin Jones; Dustin Pittman; David Solomon

2011-08-01T23:59:59.000Z

129

An Observational Study of the Dryline  

Science Conference Proceedings (OSTI)

This study presents analyses of data collected in the vicinity of a cloud-free dryline that occurred in western Oklahoma on 24 May 1989. Observations reveal sharp contrasts across the quasi-stationary, north-south dryline during midafternoon. Of ...

Conrad L. Ziegler; Carl E. Hane

1993-04-01T23:59:59.000Z

130

Overtone Mobility Spectrometry: Part 1. Experimental Observations  

E-Print Network (OSTI)

introduce a new approach for isolating ions having specific mobilities (or collision cross sections). IonsARTICLES Overtone Mobility Spectrometry: Part 1. Experimental Observations Ruwan T. Kurulugama, Indiana University, Bloomington, Indiana, USA A new method that allows a linear drift tube to be operated

Clemmer, David E.

131

Observations of Ferroelastic Switching by Raman Spectroscopy  

E-Print Network (OSTI)

Thermal barrier coatings (TBCs) have become an important part of turbine technology by providing thermal protection to the underlying metallic components. These coatings are typically made from a zirconia-based ceramics which have a low thermal conductivity and thermal expansion coefficients similar to those of the superalloys. Early failure in these coatings is most often due to foreign object damage and erosion resulting in delamination and spallation. To protect against these types of failure, new materials with increased toughness are needed. There are two main toughening mechanisms in ceramics: transformation toughening, which is limited to low temperature applications and ferroelastic toughening which is accessible at all temperatures. Ferroelastic toughening occurs when the c-axis of the tetragonal grain undergoes reorientation under the application of an external stress. In this study, ferroelastic toughening is examined by Raman spectroscopy. It is shown that by using polarized confocal Raman spectroscopy one can not only observed the ferroelastic process, but also measure the parameters that control the increase in toughness observed. Ferroelastic toughening was observed in two ways in the 18mol% ceria stabilized zirconia (18CSZ) samples studied here. Samples were either exposed to indentation damage or uniaxial loading. In both of these cases maps of the ceramic surface were taken using Raman spectroscopy following loading and the relative intensities of the tetragonal peaks were analyzed. The resulting intensity profiles were used to monitor the reorientation of domains corresponding to ferroelastic toughening. Changes in domain orientation were observed that corresponded to the reorientation of domains along cracks as well as on a larger scale along those cracks. Domain reorientation was also observed under uniaxial loading and the stresses required for domain formation and movement were measured.

Bolon, Amy Marie

2011-12-01T23:59:59.000Z

132

Rapid Scan AERI Observations: Benefits and Analysis  

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

Rapid Scan AERI Observations: Benefits and Analysis Rapid Scan AERI Observations: Benefits and Analysis W. F. Feltz, D. D. Turner, R. O. Knuteson, and R. G. Dedecker Space Science and Engineering Center Cooperative Institute of Mesoscale Meteorological Studies University of Wisconsin-Madison Madison, Wisconsin D. D. Turner Pacific Northwest National Laboratory Richland, Washington Introduction The U.S. Department of Energy's (DOE's) Atmospheric Radiation Measurement (ARM) Program has funded the development of the atmospheric emitted radiance interferometer (AERI). This has led to a hardened, autonomous system that measures downwelling infrared (IR) radiance at high-spectral resolution. Seven AERI systems have been deployed around the world as part of the ARM Program. The initial goal of these instruments was to characterize the clear-sky IR emission from the atmosphere,

133

Observables in Strongly Coupled Anisotropic Theories  

E-Print Network (OSTI)

We review certain anisotropic gauge/gravity dualities, focusing more on a theory with space dependent axion term. Then we discuss and also present some new results for several observables: the static potential and force, the imaginary part of the static potential, the quark dipole in the plasma wind, the drag force and diffusion time, the jet quenching of heavy and light quarks, the energy loss of rotating quarks, the photon production and finally the violation of the holographic viscosity over entropy bound. The corresponding weakly coupled results are also discussed. Finally we investigate the bounds of the parameters of the current strongly coupled anisotropic theories attempting to match them with the observed quark-gluon plasma and report the problems appear.

Dimitrios Giataganas

2013-06-06T23:59:59.000Z

134

Fermi Observations of Gamma-ray Bursts  

SciTech Connect

The gamma-ray emission mechanism of Gamma-ray bursts (GRBs) are still unknown. Fermi Gamma-ray Space Telescope successfully detected high-energy (> 100 MeV) emission from 17 GRBs since its launch. Fermi revealed the distinct temporal behaviors and extra spectral component from high-energy emission. These new observational results are driving many theoretical implications, such as leptonic, hadronic and afterglow origin. The highest energy photon detected by Fermi gives a constraint on the bulk Lorentz factor of the ultra-relativistic jets of GRBs. The impact of the Fermi GRB observations extends not only to the GRB-related issues but also to the outside GRB physics, such as quantum gravity and model of the extra galactic background light.

Ohno, Masanori [Institute of Space and Astronautical Science, JAXA, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210 (Japan)

2010-10-15T23:59:59.000Z

135

Variations in task and the ideal observer  

Science Conference Proceedings (OSTI)

In most previous studies involving the ideal observer, the task considered has been that of simple detection where it is assumed that there is complete a priori knowledge of the background and of the possible object's shape, amplitude, and position. It is shown that redefining the detection task to include the possibility of an unknown, slowly varying background reduces the importance of the low-frequency components in the image for the ideal observer. More complicated tasks than object detection are also considered, such as determination of an object's position and width and the resolution of two objects. These higher-order tasks further enhance the importance of the high-frequency information content of the image.

Hanson, K.M.

1983-01-01T23:59:59.000Z

136

Direct Observation of Oxygen Superstructures in Manganites  

Science Conference Proceedings (OSTI)

We report the observation of superstructures associated with the oxygen 2p states in two prototypical manganites using x-ray diffraction at the oxygen K edge. In the stripe order system Bi{sub 0.31}Ca{sub 0.69}MnO{sub 3}, hole-doped O states are orbitally ordered, at the same propagation vector as the Mn orbital ordering, but no oxygen charge stripes are found at this periodicity. In La{sub 7/8}Sr{sub 1/8}MnO{sub 3}, we observe a 2p charge ordering described by alternating hole-poor and hole-rich MnO planes that is consistent with some of the recent predictions.

Grenier, S.; Tonnerre, J. M. [Institut Neel, CNRS and Universite Joseph Fourier, BP 166, F-38042 Grenoble Cedex 9 (France); Thomas, K. J.; Hill, J. P. [Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973 (United States); Staub, U.; Bodenthin, Y.; Garcia-Fernandez, M. [Swiss Light Source, Paul Sherrer Institut, 5232 Villigen (Switzerland); Scagnoli, V. [European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex 9 (France); Kiryukhin, V.; Cheong, S-W.; Kim, B. G. [Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854 (United States)

2007-11-16T23:59:59.000Z

137

Direct observation of time reversal violation  

SciTech Connect

A direct evidence for Time Reversal Violation (TRV) means an experiment that, considered by itself, clearly shows TRV independent of, and unconnected to, the results for CP Violation. No existing result before the recent BABAR experiment with entangled neutral B mesons had demonstrated TRV in this sense. There is a unique opportunity for a search of TRV with unstable particles thanks to the Einstein-Podolsky-Rosen (EPR) Entanglement between the two neutral mesons in B, and PHI, Factories. The two quantum effects of the first decay as a filtering measurement and the transfer of information to the still living partner allow performing a genuine TRV asymmetry with the exchange of 'in' and 'out' states. With four independent TRV asymmetries, BABAR observes a large deviation of T-invariance with a statistical significance of 14 standard deviations, far more than needed to declare the result as a discovery. This is the first direct observation of TRV in the time evolution of any system.

Bernabeu, J. [Department of Theoretical Physics, University of Valencia, and IFIC, Joint Centre Univ. Valencia-CSIC (Spain)

2013-06-12T23:59:59.000Z

138

Self-potential observations during hydraulic fracturing  

SciTech Connect

The self-potential (SP) response during hydraulic fracturing of intact Sierra granite was investigated in the laboratory. Excellent correlation of pressure drop and SP suggests that the SP response is created primarily by electrokinetic coupling. For low pressures, the variation of SP with pressure drop is linear, indicating a constant coupling coefficient (Cc) of -200 mV/MPa. However for pressure drops >2 MPa, the magnitude of the Cc increases by 80% in an exponential trend. This increasing Cc is related to increasing permeability at high pore pressures caused by dilatancy of micro-cracks, and is explained by a decrease in the hydraulic tortuosity. Resistivity measurements reveal a decrease of 2% prior to hydraulic fracturing and a decrease of {approx}35% after fracturing. An asymmetric spatial SP response created by injectate diffusion into dilatant zones is observed prior to hydraulic fracturing, and in most cases this SP variation revealed the impending crack geometry seconds before failure. At rupture, injectate rushes into the new fracture area where the zeta potential is different than in the rock porosity, and an anomalous SP spike is observed. After fracturing, the spatial SP distribution reveals the direction of fracture propagation. Finally, during tensile cracking in a point load device with no water flow, a SP spike is observed that is caused by contact electrification. However, the time constant of this event is much less than that for transients observed during hydraulic fracturing, suggesting that SP created solely from material fracture does not contribute to the SP response during hydraulic fracturing.

Moore, Jeffrey R.; Glaser, Steven D.

2007-09-13T23:59:59.000Z

139

LNG Observer: Second Qatargas train goes onstream  

Science Conference Proceedings (OSTI)

The January-February, 1997 issue of the LNG Observer is presented. The following topics are discussed: second Qatargas train goes onstream; financing for the eighth Indonesian liquefaction train; Koreans take stakes in Oman LNG; US imports and exports of LNG in 1996; A 60% increase in proved reserves on the North West Shelf; proposals for Indian LNG terminal CEDIGAZ forecasts world LNG trade by 2010; growth for North African gas production and exports; and new forecast sees strong growth for Asian gas.

NONE

1997-01-01T23:59:59.000Z

140

Quantum mechanics problems in observer's mathematics  

Science Conference Proceedings (OSTI)

This work considers the ontology, guiding equation, Schrodinger's equation, relation to the Born Rule, the conditional wave function of a subsystem in a setting of arithmetic, algebra and topology provided by Observer's Mathematics (see www.mathrelativity.com). Observer's Mathematics creates new arithmetic, algebra, geometry, topology, analysis and logic which do not contain the concept of continuum, but locally coincide with the standard fields. Certain results and communications pertaining to solutions of these problems are provided. In particular, we prove the following theorems: Theorem I (Two-slit interference). Let {Psi}{sub 1} be a wave from slit 1, {Psi}{sub 2} - from slit 2, and {Psi} = {Psi}{sub 1}+{Psi}{sub 2}. Then the probability of {Psi} being a wave equals to 0.5. Theorem II (k-bodies solution). For W{sub n} from m-observer point of view with m>log{sub 10}((2 Multiplication-Sign 10{sup 2n}-1){sup 2k}+1), the probability of standard expression of Hamiltonian variation is less than 1 and depends on n,m,k.

Khots, Boris; Khots, Dmitriy [Compressor Controls Corp, Des Moines, Iowa (United States); iMath Consulting LLC, Omaha, Nebraska (United States)

2012-11-06T23:59:59.000Z

Note: This page contains sample records for the topic "observations classroom observations" from the National Library of EnergyBeta (NLEBeta).
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141

Apparatus for observing a hostile environment  

DOE Patents (OSTI)

An apparatus is provided for observing a hostile environment, comprising a housing and a camera capable of insertion within the housing. The housing is a double wall assembly with an inner and outer wall with an hermetically sealed chamber therebetween. A housing for an optical system used to observe a hostile environment is provided, comprising a transparent, double wall assembly. The double wall assembly has an inner wall and an outer wall with an hermetically sealed chamber therebetween. The double wall assembly has an opening and a void area in communication with the opening. The void area of the housing is adapted to accommodate the optical system within said void area. An apparatus for protecting an optical system used to observe a hostile environment is provided comprising a housing; a tube positioned within the housing; and a base for supporting the housing and the tube. The housing comprises a double wall assembly having an inner wall and an outerwall with an hermetically sealed chamber therebetween. The tube is adapted to house the optical system therein.

Nance, Thomas A. (Aiken, SC); Boylston, Micah L. (Williston, SC); Robinson, Casandra W. (Trenton, SC); Sexton, William C. (Aiken, SC); Heckendorn, Frank M. (Aiken, SC)

2000-01-01T23:59:59.000Z

142

Observation-based test set generation  

E-Print Network (OSTI)

When circuits are manufactured, there are unavoidable defects that occur in a small but significant portion of the products. Input test patterns that can detect these defects are uniquely generated for each circuit in advance of their production. Current test set generation relies primarily on the "stuck-at" model, which both excites and observes every site of the circuit. However, a test set with good stuck-at fault coverage will not necessarily find all the defects in a circuit. Other models, such as bridging surrogates and transition surrogates, can also be considered when evaluating the quality of a test set. My research explores the role that observation alone plays in generating a set of valuable tests. I compare the performance of test patterns generated with traditional detection methods and ones made only considering the observation of each site. I also compare the lengths of each test set, with the goal of finding shorter and more effective tests that achieve an acceptable defective part level for a circuit.

Cobb, Jeffrey Lee

2004-01-01T23:59:59.000Z

143

Observation of the submillimeter cosmic background spectrum  

SciTech Connect

An experimental measurement of the spectrum of the submillimeter cosmic background radiation is described. The experiment consists of measuring the night sky emission at an altitude of 39 km, correcting for the atmospheric molecular line emission, and placing limits on the contamination from sources of continuum radiation such as the apparatus itself and the earth. The observations were made on 24 July 1974 using a fully calibrated liquid-helium-cooled balloon- borne spectrophotometer. Important features of the apparatus include a cooled antenna, a polarizing interferometer, and a germanium bolometric detector. The characterization of the spectrophotometer includes the large angle response and emission of the antenna. The calibration of the instrument and corrections to the observed sky spectrum are based on measurements made during the flight. A simple model of the molecular line emission is used to determine the atmospheric contribution. The resulting spectrum covers the frequency range from 4 to 17 cm$sup -1$ and establishes that the cosmic background radiation follows the high frequency quantum cutoff for a 3K blackbody. A blackbody temperature of 2.99/sub -.$sub 14$/$sup +$.$sup 07$/K is deduced from our data. The present status of the cosmic background observations, which span more than three decades in frequency, is analyzed and it is concluded that they are all consistent with a blackbody temperature of 2.90 +- .04K (+- 1 SIGMA). This firmly supports the Big Bang cosmological model of the universe. (auth)

Woody, D.P.

1975-11-13T23:59:59.000Z

144

Ultra High-Energy Cosmic Ray Observations  

E-Print Network (OSTI)

The year 2007 has furnished us with outstanding results about the origin of the most energetic cosmic rays: a flux suppression as expected from the GZK-effect has been observed in the data of the HiRes and Auger experiments and correlations between the positions of nearby AGN and the arrival directions of trans-GZK events have been observed by the Pierre Auger Observatory. The latter finding marks the beginning of ultra high-energy cosmic ray astronomy and is considered a major breakthrough starting to shed first light onto the sources of the most extreme particles in nature. This report summarizes those observations and includes other major advances of the field, mostly presented at the 30th International Cosmic Ray Conference held in Merida, Mexico, in July 2007. With increasing statistics becoming available from current and even terminated experiments, systematic differences amongst different experiments and techniques can be studied in detail which is hoped to improve our understanding of experimental tec...

Kampert, Karl-Heinz

2008-01-01T23:59:59.000Z

145

Observations and Simulations of Fibrils and Mottles  

E-Print Network (OSTI)

With the recent advent of the Swedish 1-m Solar Telescope (SST), advanced image processing techniques, as well as numerical simulations that provide a more realistic view of the chromosphere, a comprehensive understanding of chromospheric jets such as spicules, mottles and fibrils is now within reach. In this paper, we briefly summarize results from a recent analysis of dynamic fibrils, short-lived jet-like features that dominate the chromosphere (as imaged in H-alpha) above and about active region plage. Using extremely high-resolution observations obtained at the SST, and advanced numerical 2D radiative MHD simulations, we show that fibrils are most likely formed by chromospheric shock waves that occur when convective flows and global oscillations leak into the chromosphere along the field lines of magnetic flux concentrations. In addition, we present some preliminary observations of quiet Sun jets or mottles. We find that the mechanism that produces fibrils in active regions is most likely also at work in quiet Sun regions, although it is modified by the weaker magnetic field and the presence of more mixed-polarity. A comparison with numerical simulations suggests that the weaker magnetic field in quiet Sun allows for significantly stronger (than in active regions) transverse motions that are superposed on the field-aligned, shock-driven motions. This leads to a more dynamic, and much more complex environment than in active region plage. In addition, our observations of the mixed polarity environment in quiet Sun regions suggest that other mechanisms, such as reconnection, may well play a significant role in the formation of some quiet Sun jets.

Bart De Pontieu; Viggo H. Hansteen; Luc Rouppe van der Voort; Michiel van Noort; Mats Carlsson

2007-02-02T23:59:59.000Z

146

Posters Ground-Based Radiometric Observations  

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

7 7 Posters Ground-Based Radiometric Observations of Atmospheric Water for Climate Research J. B. Snider, D. A. Hazen, A. J. Francavilla, W. B. Madsen, and M. D. Jacobson National Oceanic and Atmospheric Administration Environmental Technology Laboratory Boulder, Colorado Introduction Surface-based microwave and infrared radiometers have been employed by the National Oceanic and Atmospheric Administration's Environmental Technology Laboratory (NOAA/ETL) in climate research since 1987. The ability of these systems to operate continuously and unattended for extended periods of time has provided significant new information on atmospheric water vapor and cloud liquid. These data are being employed to improve our understanding of cloud-radiation feedback mechanisms, an understanding

147

Flip-flop phenomenon: observations and theory  

E-Print Network (OSTI)

In many active stars the spots concentrate on two permanent active longitudes which are 180 degrees apart. In some of these stars the dominant part of the spot activity changes the longitude every few years. This so-called flip-flop phenomenon has up to now been reported in 11 stars, both single and binary alike, and including also the Sun. To explain this phenomenon, a non-axisymmetric dynamo mode, giving rise to two permanent active longitudes at opposite stellar hemispheres, is needed together with an oscillating axisymmetric magnetic field. Here we discuss the observed characteristics of the flip-flop phenomenon and present a dynamo solution to explain them.

D. Elstner; H. Korhonen

2005-01-17T23:59:59.000Z

148

AGN fueling the observational point of view  

E-Print Network (OSTI)

Observations at multiple wavelengths are reviewed to search for evidence for fueling mechanisms in galaxies, both for nuclear starbursts and AGN activity. Although it is undisputed that dynamical perturbations such as bars or tidal interactions accumulate gas in the central regions and sometimes trigger nuclear starbursts, the evidence remains scarce that these are necessary to fuel AGNs. Interpretations in terms of time-scales, feed-back, and black hole evolution are discussed. It is suggested that the AGN phase corresponds to the early-type phases of galaxies.

Combes, F

2002-01-01T23:59:59.000Z

149

Brief paper: Near optimal interval observers bundle for uncertain bioreactors  

Science Conference Proceedings (OSTI)

In this paper we design an interval observer for the estimation of unmeasured variables of uncertain bioreactors. The observer is based on a bounded error observer, as proposed in [Lemesle, V., & Gouze, J.-L. (2005). Hybrid bounded error observers for ... Keywords: Bounded error observers, Interval observers, Uncertain systems, Wastewater treatment

Marcelo Moisan; Olivier Bernard; Jean-Luc Gouzé

2009-01-01T23:59:59.000Z

150

Fermi LAT Observations of LS 5039  

SciTech Connect

The first results from observations of the high-mass X-ray binary LS 5039 using the Fermi Gamma-ray Space Telescope data between 2008 August and 2009 June are presented. Our results indicate variability that is consistent with the binary period, with the emission being modulated with a period of 3.903 {+-} 0.005 days; the first detection of this modulation at GeV energies. The light curve is characterized by a broad peak around superior conjunction in agreement with inverse Compton scattering models. The spectrum is represented by a power law with an exponential cutoff, yielding an overall flux (100 MeV-300 GeV) of 4.9 {+-} 0.5(stat) {+-} 1.8(syst) x 10{sup -7} photon cm{sup -2} s{sup -1}, with a cutoff at 2.1 {+-} 0.3(stat) {+-} 1.1(syst) GeV and photon index {Gamma} = 1.9 {+-} 0.1(stat) {+-} 0.3(syst). The spectrum is observed to vary with orbital phase, specifically between inferior and superior conjunction. We suggest that the presence of a cutoff in the spectrum may be indicative of magnetospheric emission similar to the emission seen in many pulsars by Fermi.

Abdo, A.A.; /Naval Research Lab, Wash., D.C. /Federal City Coll.; Ackermann, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Ajello, M.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Atwood, W.B.; /UC, Santa Cruz; Axelsson, M.; /Stockholm U. /Stockholm U., OKC; Baldini, L.; /INFN, Pisa; Ballet, J.; /DAPNIA, Saclay; Barbiellini, G.; /INFN, Trieste /Trieste U.; Bastieri, D.; /INFN, Padua /Padua U.; Baughman, B.M.; /Ohio State U.; Bechtol, K.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bellazzini, R.; /INFN, Pisa; Berenji, B.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Blandford, R.D.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bloom, E.D.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bonamente, E.; /INFN, Perugia /Perugia U.; Borgland, A.W.; /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept.; Bregeon, J.; /INFN, Pisa; Brez, A.; /INFN, Pisa; Brigida, M.; /Bari U. /INFN, Bari; Bruel, P.; /Ecole Polytechnique /Washington U., Seattle /Padua U. /Bari U. /INFN, Bari /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /IASF, Milan /Milan Polytechnic /DAPNIA, Saclay /ASDC, Frascati /INFN, Perugia /Perugia U. /NASA, Goddard /NASA, Goddard /CSST, Baltimore /DAPNIA, Saclay /Naval Research Lab, Wash., D.C. /George Mason U. /NASA, Goddard /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /INFN, Perugia /Perugia U. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Montpellier U. /Sonoma State U. /Stockholm U. /Stockholm U., OKC /DAPNIA, Saclay /NASA, Goddard /CSST, Baltimore /SLAC /ASDC, Frascati /Naval Research Lab, Wash., D.C. /INFN, Trieste /Bari U. /INFN, Bari /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., HEPL /KIPAC, Menlo Park /Stanford U., Phys. Dept. /SLAC /Grenoble Observ. /CENBG, Gradignan /CENBG, Gradignan /Montpellier U.; /more authors..

2012-03-29T23:59:59.000Z

151

Reported Significant Observation (RSO) studies. Revision 1  

SciTech Connect

The Reported Significant Observation (RSO) study used in the field of safety is an information-gathering technique where employee-participants describe situations they have personally witnessed involving good and bad practices and safe and unsafe conditions. This information is useful in the risk assessment process because it focuses on hazards and thereby facilitates their elimination. However, RSO cannot be the only component in a risk assessment program. Used by the Air Force in their aviation psychology program and further developed by John C. Flanagan, RSO is more commonly known as the ``Critical Incident Technique.`` However, the words ``Critical`` and ``Incident`` had other connotations in nuclear safety, prompting early users within the Aerojet Nuclear Company to coin the more fitting title of ``Reported Significant Observations.`` The technique spread slowly in the safety field primarily because the majority of users were researchers interested in after-the-fact data, with application to everyday problems and behavioral factors. RSO was formally recognized as a significant hazard reduction tool during the development of the Management Oversight and Risk Tree (MORT) program for the US Atomic Energy Commission. The Department of Energy (DOE) has, in turn, adopted MORT for its system safety program, and this has resulted in RSO being a modern and viable technique for DOE contractor safety programs.

Eicher, R.W.

1992-12-01T23:59:59.000Z

152

The Optical Properties of Equatorial Cirrus from Observations in the ARM Pilot Radiation Observation Experiment  

Science Conference Proceedings (OSTI)

The optical properties of equatorial cirrus were studied during a three-week period of the ARM Pilot Radiation and Observation Experiment at Kavieng, Papua New Guinea, in January and February 1993. The experiment consisted of vertical lidar (532 ...

C. M. R. Platt; S. A. Young; P. J. Manson; G. R. Patterson; S. C. Marsden; R. T. Austin; J. H. Churnside

1998-06-01T23:59:59.000Z

153

Enhancement of ARM Surface Meteorological Observations during the Fall 1996 Water Vapor Intensive Observation Period  

Science Conference Proceedings (OSTI)

This work describes in situ moisture sensor comparisons that were performed in conjunction with the first Water Vapor Intensive Observation Period (IOP) conducted at the Atmospheric Radiation Measurement (ARM) Program Southern Great Plains (SGP) ...

Scott J. Richardson; Michael E. Splitt; Barry M. Lesht

2000-03-01T23:59:59.000Z

154

COMPTEL Observations of Gamma-ray Bursts  

E-Print Network (OSTI)

INTRODUCTION The origin of cosmic g-ray bursts is as mysterious today as it was when they were discovered more than 25 years ago. Despite a wealth of new observational data obtained with the BATSE instrument on board the Compton Gamma Ray Observatory, many of the fundamental questions remain unanswered. For instance, although BATSE has provided a tremendous statistical advantage (allowing the most accurate measurement of the spatial isotropy and inhomogeneity of burst sources ), its limited angular resolution and spectral range have given us an incomplete picture of the small-scale angular source distribution and high energy emission properties. 2,3 Furthermore, the limited angular resolution has also made it difficult to search for burst counterparts at other wavelengths. The COMPTEL instrument on board Compton measures the locations and spectra (0.75-30 MeV) of several strong g-ray bursts per year which occur within the ~1 sr fieldof -view of the main ("telescope") instrument.

Kippen Ryan Connors; R. M. Kippen; B J. Ryan; B A. Connors; B M. Mcconnell; V. Schönfelder; C J. Greiner; C M. Varendorff; W. Collmar; C W. Hermsen; D L. Kuiper; D C. Winkler; L. O. Hanlon E; K. S. O’flaherty E

1995-01-01T23:59:59.000Z

155

Science Results Enabled by SDSS Astrometric Observations  

E-Print Network (OSTI)

We discuss several results made possible by accurate SDSS astrometric measurements in a large sky area, with emphasis on asteroids and stellar proper motions obtained by comparing POSS and SDSS. SDSS has observed over 200,000 moving objects in five photometric bands, corresponding to about two orders of magnitude increase over previous multi--color surveys. These data were used to extend the measurement of asteroid size distribution to a smaller size limit, to demonstrate that asteroid dynamical families, defined as clusters in orbital parameter space, also strongly segregate in color space, and to discover a correlation between asteroid age and colors. A preliminary analysis of SDSS-POSS proper motions for about 1 million M dwarf stars demonstrates that, in the 0.1-1 kpc distance range, the rotational velocity and its dispersion for disk stars increase with the distance from the Galactic plane.

Z. Ivezic; N. Bond; M. Juric; J. A. Munn; R. H. Lupton; J. R. Pier; G. S. Hennessy; G. R. Knapp; J. E. Gunn; C. M. Rockosi; T. Quinn

2007-01-17T23:59:59.000Z

156

Prospects for Observations of Microquasars with GLAST  

SciTech Connect

The Gamma-ray Large Area Space Telescope (GLAST) is a next generation high energy gamma-ray observatory due for launch in Fall 2007. The primary instrument is the Large Area Telescope (LAT), which will measure gamma-ray flux and spectra from 20 MeV to > 300 GeV and is a successor to the highly successful EGRET experiment on CGRO. The LAT will have better angular resolution, greater effective area, wider field of view and broader energy coverage than any previous experiment in this energy range. This poster will present performance estimates with particular emphasis on how these apply to studies of microquasars. The LAT's scanning mode will provide unprecedented uniformity of sky coverage and permit measurements of light curves for any source. We will show results from recent detailed simulations that illustrate the potential of the LAT to observe microquasar variability and spectra, including source sensitivity and ability to detect orbital modulation.

Dubois, Richard; /SLAC

2007-10-09T23:59:59.000Z

157

Chandra Observations of WZ Sge in Superoutburst  

E-Print Network (OSTI)

We present seven separate Chandra observations of the 2001 superoutburst of WZ Sge. The high-energy outburst was dominated by intense EUV emission lines, which we interpret as boundary layer emission scattered into our line of sight in an accretion disc wind. The direct boundary layer emission was hidden from view, presumably by the accretion disc. The outburst orbital hump (OOH) was detected in the EUV, but the common superhump was not, indicating a geometric mechanism in the former and a dissipative mechanism in the latter. X-rays detected during outburst were not consistent with boundary layer emission and we argue that there must be a second source of X-rays in dwarf novae in outburst.

Peter J. Wheatley; Christopher W. Mauche

2004-12-07T23:59:59.000Z

158

Global Volunteer Observing Ship (VOS) Program Data  

DOE Data Explorer (OSTI)

CDIAC provides data management support for the Global Volunteer Observing Ship (VOS) Program. The VOS project is coordinated by the UNESCO International Ocean Carbon Coordination Project (IOCCP). The international groups from 14 countries have been outfitting research ships and commercial vessels with automated CO2 sampling equipment to analyze the carbon exchange between the ocean and atmosphere. [copied from http://cdiac.ornl.gov/oceans/genInfo.html] CDIAC provides a map interface with the shipping routes of the 14 countries involved marked in different colors. Clicking on the ship's name on that route brings up information about the vessel, the kinds of measurements collected and the timeframe, links to project pages, and, most important, the links to the data files themselves. The 14 countries are: United States, United Kingdom, Japan, France, Germany, Australia, Canada, Spain, Norway, New Zealand, China (including Taiwan), Iceland, and the Netherlands. Both archived and current, underway data can be accessed from the CDIAC VOS page.

159

Observations of Gamma Ray Bursts with AGILE  

E-Print Network (OSTI)

The AGILE satellite, in orbit since 2007, localized up to October 2009 about 1 Gamma Ray Burst (GRB) per month with the hard X-ray imager SuperAGILE (18 - 60 keV) (with a rate reduced by a factor 2-3 in spinning mode) and is detecting around 1 GRB per week with the non-imaging Mini-Calorimeter (MCAL, 0.35 - 100 MeV). Up to October 2011 the AGILE Gamma Ray Imaging Detector firmly detected four GRBs in the energy band between 20 MeV and few GeV. In this paper we review the status of the GRBs observation with AGILE and discuss the upper limits in the gamma-ray band of the non-detected events.

Longo, F; Del Monte, E; Marisaldi, M; Fuschino, F; Giuliani, A

2011-01-01T23:59:59.000Z

160

Laser frequency combs for astronomical observations  

E-Print Network (OSTI)

A direct measurement of the universe's expansion history could be made by observing in real time the evolution of the cosmological redshift of distant objects. However, this would require measurements of Doppler velocity drifts of about 1 centimeter per second per year, and astronomical spectrographs have not yet been calibrated to this tolerance. We demonstrate the first use of a laser frequency comb for wavelength calibration of an astronomical telescope. Even with a simple analysis, absolute calibration is achieved with an equivalent Doppler precision of approximately 9 meters per second at about 1.5 micrometers - beyond state-of-the-art accuracy. We show that tracking complex, time-varying systematic effects in the spectrograph and detector system is a particular advantage of laser frequency comb calibration. This technique promises an effective means for modeling and removal of such systematic effects to the accuracy required by future experiments to see direct evidence of the universe's putative acceleration.

Tilo Steinmetz; Tobias Wilken; Constanza Araujo-Hauck; Ronald Holzwarth; Theodor W. Hänsch; Luca Pasquini; Antonio Manescau; Sandro D'Odorico; Michael T. Murphy; Thomas Kentischer; Wolfgang Schmidt; Thomas Udem

2008-09-09T23:59:59.000Z

Note: This page contains sample records for the topic "observations classroom observations" 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

Report: Human Capital Discussion and Observations  

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

Human Capital Discussion, Human Capital Discussion, Observations, and Recommendations August 24, 2006 Submitted by: Mr. A. James Barnes and Mr. Dennis Ferrigno Background: During the March 23-24, 2006 EMAB Public Meeting, Assistant Secretary for Environmental Management (EM-1), James Rispoli, asked the EMAB members to pursue a review of EM Human Capital issues. Although the National Academy of Public Administration (NAPA) is also conducting a review of this topic - the results of which will be available in October 2007 - Mr. Rispoli instructed EMAB to identify areas that need improvement and make recommendations to begin bettering the program now. EMAB focused specifically on the areas of: Morale/Workplace Census Planning/Accountability Training/Certification

162

Uniformly accelerated observer in a thermal bath  

E-Print Network (OSTI)

We investigate the quantum field aspects in flat spacetime for an uniformly accelerated observer moving in a thermal bath. In particular, we obtain an exact closed expression of the reduced density matrix for an uniformly accelerated observer with acceleration $a = 2\\pi T$ when the state of the quantum field is a thermal bath at temperature $T^\\prime$. We find that the density matrix has a simple form with an effective partition function $Z$ being a product, $Z = Z_T Z_{T^\\prime}$, of two thermal partition functions corresponding to temperatures $T$ and $T^\\prime$ and hence is not thermal, even when $T = T^\\prime$. We show that, even though the partition function has a product structure, the two thermal baths are, in fact, interacting systems; although in the high frequency limit $\\omega_k \\gg T$ and $\\omega_k \\gg T^\\prime$, the interactions are found to become sub-dominant. We further demonstrate that the resulting spectrum of the Rindler particles can be interpreted in terms of spontaneous and stimulated emission due to the background thermal bath. The density matrix is also found to be symmetric in the acceleration temperature $T$ and the thermal bath temperature $T^\\prime$ indicating that thermodynamic experiments alone cannot distinguish between the thermal effects due to $T$ and those due to $T^\\prime$. The entanglement entropy associated with the reduced density matrix (with the background contribution of the Davies-Unruh bath removed) is shown to satisfy, in the $\\omega_k \\gg T^\\prime$ limit, a first law of thermodynamics relation of the form $T \\delta S = \\delta E$ where $\\delta E$ is the difference in the energies corresponding to the reduced density matrix and the background Davies-Unruh bath. The implications are discussed.

Sanved Kolekar

2013-09-12T23:59:59.000Z

163

OBSERVATION OF DIPOLAR FERROMAGNETISM BY TEM TECHNIQUES.  

Science Conference Proceedings (OSTI)

Magnetostatic interactions play a central role in determining the magnetic response of an array of patterned magnetic elements or magnetized nanoparticles of given shape. The Fourier space approach recently introduced for the analytical computation of the demagnetizing tensor, field and energy for particles of arbitrary shape [1], has been recently extended to cover interactions between elements [2]. The main achievement has been the definition of a generalized dipole-dipole interaction for cylindrical objects, which takes into account the influence of shape anisotropy without resorting to,any kind of approximations [3]. Once the interaction energy is available, it becomes possible to evaluate the minimum energy state of the system for a given set of external parameters (such as applied field, aspect ratio, distance between elements). It turns out that, below a critical combination of aspect ratios and distances, the system undergoes a phase transition, changing abruptly from a closure domain state, with zero net magnetization, to a dipolar ferromagnetic state with a net magnetization which depends on the interaction strength between the elements. In order to observe this phenomenon by TEM, it is necessary to estimate the feasibility of the experiment by a series of simulations. Figure 1 shows the electron optical phase shifts for the system of three weakly (a-c) and strongly (d) interacting disks. The elements have a radius of 50 nm, a thickness of 5 nm (aspect ratio 1/20), and are uniformly magnetized at 2 T. By comparing Fig.1 (c) and (d), it can be seen that the fingerprint of the transition is the presence of fringing fields around the elements, revealed by the cosine fringes which resemble a dipole-like field in (d). When the system is in the closure-domain state, as in (a-c), no fringing field can be observed on a large scale. Figure 2 shows a set of Fresnel images, calculated for the same configurations as in Fig.1. As the Fresnel technique is scarcely sensitive to fringing fields, their effect is not evident in the images. However, by following the bright and dark contrast features in each image, a change in magnetization can be deduced, also when the electrostatic phase shift proportional to the thickness is taken into account. An alternative, more indirect, opportunity to observe the transition is granted by hysteresis loops. Figure 3 shows calculated hysteresis curves for non-interacting (a), weakly interacting (b) and strongly interacting (c) disks. The applied field is in-plane, along one of the triangular symmetry axis (0{sup o}, 60{sup o} or 120{sup o}). The transition is revealed by a remnant magnetization in zero field (c), contrary to the behavior of the weak interaction (b). Dipolar ferromagnetism can, therefore, be successfully investigated by TEM, where at least three different techniques, phase retrieval, phase contrast, and in-situ hysteresis experiments, are available for detecting the phase transition [4].

BELEGGIA, M.ZHU,Y.TANDON,S.ET AL.

2004-08-01T23:59:59.000Z

164

Direct observation of a magnetic Bose glass  

Science Conference Proceedings (OSTI)

A Bose glass is a novel state of matter that emerges in systems of interacting bosons in the presence of quenched disorder. At sufficiently low temperatures, disorder-free bosons are subject to so-called Bose-Einstein condensation (BEC). BEC can involve atoms in liquid 4He, laser-cooled ions in magnetic traps,2 Cooper pairs in superconductors, or magnons in magnetic systems. Due to peculiarities of Bose statistics, particles lose their individuality and occupy a unique quantum-mechanical state. The wave function of this condensate establishes long-range quantum phase coherence across a macroscopic sample. This, in turn, spawns unique quantum phenomena such as superfluity,5 Josephson effect6 and vortex matter. For repulsive bosons, quenched disorder disrupts the condensate and interferes with phase coherence. The result is a peculiar glassy state with only short-range phase correlations. While some experimental evidence of this was found in ultracold atoms,9 novel high-temperature superconductors,10 and quantum magnets,11, 12 none of the studies were direct. The key characteristic, namely the wave function of the condensate disrupted by disorder on the microscopic scale, remained inaccessible. Hereby we report a direct neutron diffraction observation of short range correlations of the BEC order parameter in a magnetic Bose glass. This phase is realized in the quantum spin ladder compound IPA-Cu(Cl0.96Br0.04)3, where disorder is induced by random chemical substitution.

Hong, Tao [ORNL; Zheludev, Andrey I [ORNL; Manaka, H. [Kagoshima University, Kagoshima JAPAN; Regnault, L.-P. [CEA, Grenoble, France

2010-01-01T23:59:59.000Z

165

Observation of Single Top Quark Production  

SciTech Connect

The author reports on the observation of electroweak production of single top quarks in p{bar p} collisions at {radical}s = 1.96 Tev using 2.3 fb{sup -1} of data collected with the D0 detector at the fermilab Tevatron Collider. Using events containing an isolated electron or muon, missing transverse energy, two, three or four jets, with one or two of them identified as originating from the fragmentation of a b quark, the measured cross section for the process p{bar p} {yields} tb + X, tqb + X is 3.94 {+-} 0.88 pb (for a top quark mass of 170 GeV). the probability to measure a cross section at this value or higher in the absence of signal is 2.5 x 10{sup -7}, corresponding to a 5.0 standard deviation significance. Using the same dataset, the measured cross sections for the t- and the s-channel processes when determined simultaneously with no assumption on their relative production rate are 3.14{sub -0.80}{sup +0.94} pb and 1.05 {+-} 0.81 pb respectively, consistent with standard model expectations. The measured t-channel cross section has a significance of 4.8 standard deviations, representing the first evidence for the production of an individual single top process to be detected.

Gerber, Cecilia E.; /Illinois U., Chicago

2009-09-01T23:59:59.000Z

166

Preliminary Studies on the Variational Assimilation of Cloud-Radiation Observations Using ARM Observations  

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

Studies on the Variational Assimilation Studies on the Variational Assimilation of Cloud-Radiation Observations Using ARM Observations M. Janisková, J.-F. Mahfouf, and J.-J. Morcrette European Centre for Medium-Range Weather Forecasts Shinfield Park, Reading Berskshire, United Kingdom Abstract A linearized cloud scheme and a radiation scheme including cloud effects have been developed at European Centre for Medium-Range Weather Forecasts (ECMWF) to assimilate cloud properties in the framework of the four-dimensional variational (4D-Var) assimilation system. To investigate the potential of those schemes to modify the model temperature, humidity and cloud profiles and produce a better match to the observed radiation fluxes, one-dimensional variational (1D-Var) assimilation experiments have been carried out using data from the Atmospheric Radiation Measurement (ARM)

167

X-ray Observations of Galaxies: The Importance of Deep High-Resolution Observations  

E-Print Network (OSTI)

X-ray observations of galaxies have grown from a curiosity into a full-fledged field of astronomy. These observations provide unique information on black holes, binary stars, and the hot phase of the ISM, which can be used to constrain the chemical evolution of the Universe, and the joint evolution of galaxies and massive black holes. These exciting results are due in large part to the high-resolution capability of {\\it Chandra}. To follow on {\\it Chandra} and push forward this science past the present capabilities, our community must build a high-resolution (sub-arcsecond) large-area (several square meters) X-ray telescope.

G. Fabbiano

2007-11-05T23:59:59.000Z

168

Correction of Marine Air Temperature Observations for Solar Radiation Effects  

Science Conference Proceedings (OSTI)

The effect of incoming solar radiation on merchant ships' observations of air temperature was assessed as part of the Voluntary Observing Ships' Special Observing Project for the North Atlantic (VSOP-NA), The ships' reports were compared with ...

Elizabeth C. Kent; Raoul J. Tiddy; Peter K. Taylor

1993-12-01T23:59:59.000Z

169

Optimum Sampling Designs for a Glider–Mooring Observing Network  

Science Conference Proceedings (OSTI)

Ocean observing systems (OOSs) constituted by moorings and gliders are becoming relevant in oceanographic and climate studies. In these observing networks, the temporal variability is captured by mooring observations, while the spatial variability ...

A. Alvarez; B. Mourre

2012-04-01T23:59:59.000Z

170

Simulated and Observed Preindustrial to Modern Vegetation and Climate Changes  

Science Conference Proceedings (OSTI)

Rising levels of carbon dioxide since the preindustrial era have likely contributed to an observed warming of the global surface, and observations show global greening and an expansion of boreal forests. This study reproduces observed climate and ...

Michael Notaro; Zhengyu Liu; Robert Gallimore; Stephen J. Vavrus; John E. Kutzbach; I. Colin Prentice; Robert L. Jacob

2005-09-01T23:59:59.000Z

171

CMB Observational Techniques and Recent Results  

E-Print Network (OSTI)

The Cosmic Microwave Background (CMB) consists of photons that were last created about 2 months after the Big Bang, and last scattered about 380,000 years after the Big Bang. The spectrum of the CMB is very close to a blackbody at 2.725 K and upper limits on any deviations of the CMB from a blackbody place strong constraints on energy transfer between the CMB and matter at all redshifts less than 2,000,000. The CMB is very nearly isotropic, but a dipole anisotropy of +/-3.346(17) mK shows that the Solar System barycenter is moving at 368+/-2 km/sec relative to the observable Universe. The dipole corresponds to a spherical harmonic index l=1. The higher indices l geq 2 indicate intrinsic inhomogeneities in the Universe that existed at the time of last scattering. While the photons have traveled freely only since the time of last scattering, the inhomogeneities traced by the CMB photons have been in place since the inflationary epoch only 10^{-35} sec after the Big Bang. These intrinsic anisotropies are much smaller in amplitude than the dipole anisotropy, with Delta T leq 100 microK. Electron scattering of the anisotropic radiation field produces an anisotropic linear polarization in the CMB with amplitudes less than 5 microK. Detailed studies of the angular power spectrum of the temperature and linear polarization anisotropies have yielded precise values for many cosmological parameters. This paper will discuss the techniques necessary to measure signals that are 100 million times smaller than the emission from the instrument and briefly describe results from experiments up to WMAP.

E. L. Wright

2003-12-31T23:59:59.000Z

172

Airborne observations of methane emissions from rice cultivation...  

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

Airborne observations of methane emissions from rice cultivation in the Sacramento Valley of California Title Airborne observations of methane emissions from rice cultivation in...

173

Magnetism and superconductivity observed to exist in harmony  

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

Magnetism and superconductivity exist in harmony Magnetism and superconductivity observed to exist in harmony Physicists have observed, for the first time in a single exotic phase,...

174

Common Cyber Security Vulnerabilities Observed in Control System...  

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

Common Cyber Security Vulnerabilities Observed in Control System Assessments by the INL NSTB Program Common Cyber Security Vulnerabilities Observed in Control System Assessments by...

175

Observation Wells At The Needles Area (DOE GTP) | Open Energy...  

Open Energy Info (EERE)

Observation Wells At The Needles Area (DOE GTP) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Observation Wells At The Needles Area (DOE GTP)...

176

Position and momentum observables on R and on R^3  

E-Print Network (OSTI)

We characterize all position and momentum observables on R and on R^3. We study some of their operational properties and discuss their covariant joint observables.

C. Carmeli; T. Heinonen; A. Toigo

2004-03-15T23:59:59.000Z

177

Observing and modeling Earths energy flows  

SciTech Connect

This article reviews, from the authors perspective, progress in observing and modeling energy flows in Earth's climate system. Emphasis is placed on the state of understanding of Earth's energy flows and their susceptibility to perturbations, with particular emphasis on the roles of clouds and aerosols. More accurate measurements of the total solar irradiance and the rate of change of ocean enthalpy help constrain individual components of the energy budget at the top of the atmosphere to within {+-}2 W m{sup -2}. The measurements demonstrate that Earth reflects substantially less solar radiation and emits more terrestrial radiation than was believed even a decade ago. Active remote sensing is helping to constrain the surface energy budget, but new estimates of downwelling surface irradiance that benefit from such methods are proving difficult to reconcile with existing precipitation climatologies. Overall, the energy budget at the surface is much more uncertain than at the top of the atmosphere. A decade of high-precision measurements of the energy budget at the top of the atmosphere is providing new opportunities to track Earth's energy flows on timescales ranging from days to years, and at very high spatial resolution. The measurements show that the principal limitation in the estimate of secular trends now lies in the natural variability of the Earth system itself. The forcing-feedback-response framework, which has developed to understand how changes in Earth's energy flows affect surface temperature, is reviewed in light of recent work that shows fast responses (adjustments) of the system are central to the definition of the effective forcing that results from a change in atmospheric composition. In many cases, the adjustment, rather than the characterization of the compositional perturbation (associated, for instance, with changing greenhouse gas concentrations, or aerosol burdens), limits accurate determination of the radiative forcing. Changes in clouds contribute importantly to this adjustment and thus contribute both to uncertainty in estimates of radiative forcing and to uncertainty in the response. Models are indispensable to calculation of the adjustment of the system to a compositional change but are known to be flawed in their representation of clouds. Advances in tracking Earth's energy flows and compositional changes on daily through decadal timescales are shown to provide both a critical and constructive framework for advancing model development and evaluation.

Stevens B.; Schwartz S.

2012-05-11T23:59:59.000Z

178

Optimization of the transmission of observable expectation values and observable statistics in continuous-variable teleportation  

Science Conference Proceedings (OSTI)

We analyze the statistics of observables in continuous-variable (CV) quantum teleportation in the formalism of the characteristic function. We derive expressions for average values of output-state observables, in particular, cumulants which are additive in terms of the input state and the resource of teleportation. Working with a general class of teleportation resources, the squeezed-bell-like states, which may be optimized in a free parameter for better teleportation performance, we discuss the relation between resources optimal for fidelity and those optimal for different observable averages. We obtain the values of the free parameter of the squeezed-bell-like states which optimize the central momenta and cumulants up to fourth order. For the cumulants the distortion between in and out states due to teleportation depends only on the resource. We obtain optimal parameters {Delta}{sub (2)}{sup opt} and {Delta}{sub (4)}{sup opt} for the second- and fourth-order cumulants, which do not depend on the squeezing of the resource. The second-order central momenta, which are equal to the second-order cumulants, and the photon number average are also optimized by the resource with {Delta}{sub (2)}{sup opt}. We show that the optimal fidelity resource, which has been found previously to depend on the characteristics of input, approaches for high squeezing to the resource that optimizes the second-order momenta. A similar behavior is obtained for the resource that optimizes the photon statistics, which is treated here using the sum of the squared differences in photon probabilities of input versus output states as the distortion measure. This is interpreted naturally to mean that the distortions associated with second-order momenta dominate the behavior of the output state for large squeezing of the resource. Optimal fidelity resources and optimal photon statistics resources are compared, and it is shown that for mixtures of Fock states both resources are equivalent.

Albano Farias, L.; Stephany, J. [Departamento de Fisica, Seccion de Fenomenos Opticos, Universidad Simon Bolivar, Apartado Postal 89000, Caracas 1080A (Venezuela, Bolivarian Republic of)

2010-12-15T23:59:59.000Z

179

Molecular quantum mechanical observers, symmetry, and string theory  

E-Print Network (OSTI)

The paper \\cite{Dance0601} tentatively suggested a physical picture that might underlie string theories. The string parameters $\\tau $ and $\\sigma_i $ were interpreted as spacetime dimensions which a simple quantum mechanical observer can observe, while symmetries of the relevant observer states could limit the observability of other dimensions. An atomic observer was the focus of the discussion. The present paper extends the discussion of\\cite{Dance0601} to molecular observers, including the nature of some common molecular bonds and their symmetries.

M. Dance

2010-11-29T23:59:59.000Z

180

classroom_obs.rtf  

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

Observation Protocol Observation Protocol PRE OBSERVATION DATA Teacher ___________________ Date __________________ School ___________________ Grade/Level _____________ Observer __________________ Program ______________ (Fill this out prior to observing classes.) Class period or time of class: Topic or topics: Placement of class or lesson within the unit of study: Placement of class or lesson within the NCISE teaching model (1-Invite; 2-Explore, Discover, Create; 3-Explanations and Solutions; 4-Take Action): Purpose (objectives): Intended outcomes: Materials Used (teacher-made, manufactured, district or department-developed; characterization of materials): How students will be assessed (for this lesson): CLASSROOM ACTIVITIES Teacher: Date: (Fill this out as you are observing classes.)

Note: This page contains sample records for the topic "observations classroom observations" 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

Toward Objective, Standardized Intensity Estimates from Surface Wind Speed Observations  

Science Conference Proceedings (OSTI)

Extreme wind climatology and event-specific intensity assessments rely heavily on surface wind field observations. The most widely used platforms sited at airports are the Automated Surface Observing System (ASOS) and its predecessor, the ...

Forrest J. Masters; Peter J. Vickery; Phuong Bacon; Edward N. Rappaport

2010-12-01T23:59:59.000Z

182

Idealized Adaptive Observation Strategies for Improving Numerical Weather Prediction  

Science Conference Proceedings (OSTI)

Adaptive sampling uses information about individual atmospheric situations to identify regions where additional observations are likely to improve weather forecasts of interest. The observation network could be adapted for a wide range of ...

Rebecca E. Morss; Kerry A. Emanuel; Chris Snyder

2001-01-01T23:59:59.000Z

183

Causal Bounds and Observable Constraints for Non-deterministic Models  

Science Conference Proceedings (OSTI)

Conditional independence relations involving latent variables do not necessarily imply observable independences. They may imply inequality constraints on observable parameters and causal bounds, which can be used for falsification and identification. ...

Roland R. Ramsahai

2012-03-01T23:59:59.000Z

184

Springtime Photochemical Air Pollution in Osaka: Field Observation  

Science Conference Proceedings (OSTI)

High concentrations of nitrogen dioxide are frequently observed in the Osaka area in the spring. To clarify the mechanism of springtime air pollution formation, a series of three-dimensional field observations was conducted in April 1993 covering ...

Shinji Wakamatsu; Itsushi Uno; Toshimasa Ohara

1998-10-01T23:59:59.000Z

185

Observations of the Distribution of Ice in Hurricanes  

Science Conference Proceedings (OSTI)

Observations of the type and distribution 0°C isotherm in three Atlantic hurricanes are presented. Supercooled drops, graupel, columns and aggregated snowflakes were observed. The supercooled drops were found only in convective updrafts stronger ...

R. A. Black; J. Hallett

1986-04-01T23:59:59.000Z

186

Observing the Galápagos–EUC Interaction: Insights and Challenges  

Science Conference Proceedings (OSTI)

Although sustained observations yield a description of the mean equatorial current system from the western Pacific to the eastern terminus of the Tropical Atmosphere Ocean (TAO) array, a comprehensive observational dataset suitable for describing ...

Kristopher B. Karnauskas; Raghu Murtugudde; Antonio J. Busalacchi

2010-12-01T23:59:59.000Z

187

Dispersion relation of electromagnetic ion cyclotron waves using Cluster observations  

E-Print Network (OSTI)

Multi-point wave observations on Cluster spacecraft are used to infer the dispersion relation of electromagnetic ion cyclotron (EMIC) waves. In this study we use a phase differencing method and observations from STAFF and ...

Pakhotin, I. P.

188

Observed and Simulated Energy Cycles in the Frequency Domain  

Science Conference Proceedings (OSTI)

The analysis of spectral energetics in the frequency domain has been applied to several observed datasets and those simulated by a GFDL general circulation model. There exists good agreement on the directions of energy flows between the observed ...

Jian Sheng; Yoshikazu Hayashi

1990-05-01T23:59:59.000Z

189

Toward a Mesoscale Observation Network in Southeast Asia  

Science Conference Proceedings (OSTI)

The current weather observation network in Southeast Asia is unable to support the accurate monitoring and prediction of the region's predominantly convective weather. Establishing a multisensor mesoscale observation network comprising automated ...

Tieh-Yong Koh; Chee-Kiat Teo

2009-04-01T23:59:59.000Z

190

Evaluating NCEP Eta Model–Derived Data against Observations  

Science Conference Proceedings (OSTI)

Data derived at the National Centers for Environmental Prediction via four-dimensional data assimilation using the Eta Model were evaluated against surface observations from two observational arrays, one located in the semihumid, continental ...

Ismail Yucel; W. James Shuttleworth; James Washburne; Fei Chen

1998-07-01T23:59:59.000Z

191

On the Computation of Gradients from Observations over Complex Terrain  

Science Conference Proceedings (OSTI)

A mathematical scheme is developed to compute the gradients of observations taken over complex terrain. The method is applied to an artificial example to demonstrate the scheme. An application is made to surface pressure observations between ...

Fred J. Kopp; Paul L. Smith; Harold D. Orville

2001-10-01T23:59:59.000Z

192

Observation Quality Control with a Robust Ensemble Kalman Filter  

Science Conference Proceedings (OSTI)

Current ensemble-based Kalman filter (EnKF) algorithms are not robust to gross observation errors caused by technical or human errors during the data collection process. In this paper, the authors consider two types of gross observational errors, ...

Soojin Roh; Marc G. Genton; Mikyoung Jun; Istvan Szunyogh; Ibrahim Hoteit

2013-12-01T23:59:59.000Z

193

Anthropogenic Warming of the Oceans: Observations and Model Results  

Science Conference Proceedings (OSTI)

Observations show the oceans have warmed over the past 40 yr, with appreciable regional variation and more warming at the surface than at depth. Comparing the observations with results from two coupled ocean–atmosphere climate models [the ...

David W. Pierce; Tim P. Barnett; Krishna M. AchutaRao; Peter J. Gleckler; Jonathan M. Gregory; Warren M. Washington

2006-05-01T23:59:59.000Z

194

Impacts of Mesonet Observations on Meteorological Surface Analyses  

Science Conference Proceedings (OSTI)

Given the heterogeneous equipment, maintenance and reporting practices, and siting of surface observing stations, subjective decisions that depend on the application tend to be made to use some observations and to avoid others. This research ...

Daniel P. Tyndall; John D. Horel

2013-02-01T23:59:59.000Z

195

Stepwise Onset of Monsoon Weather Observed in the Nepal Himalaya  

Science Conference Proceedings (OSTI)

Mountain weather changes in the Nepal Himalaya were intensively examined during the 2003 monsoon onset using in situ datasets, observed by multiple automatic weather stations (AWS) distributed across the Coordinated Enhanced Observing Period (...

K. Ueno; K. Toyotsu; L. Bertolani; G. Tartari

2008-07-01T23:59:59.000Z

196

AMBROSia: An Autonomous Model-Based Reactive Observing System  

Science Conference Proceedings (OSTI)

Observing systems facilitate scientific studies by instrumenting the real world and collecting corresponding measurements, with the aim of detecting and tracking phenomena of interest. Our AMBROSia project focuses on a class of observing systems which ...

David Caron; Abhimanyu Das; Amit Dhariwal; Leana Golubchik; Ramesh Govindan; David Kempe; Carl Oberg; Abhishek Sharma; Beth Stauffer; Gaurav Sukhatme; Bin Zhang

2007-05-01T23:59:59.000Z

197

Measurement Methods Affect the Observed Global Dimming and Brightening  

Science Conference Proceedings (OSTI)

Surface incident solar radiation G determines our climate and environment, and has been widely observed with a single pyranometer since the late 1950s. Such observations have suggested a widespread decrease between the 1950s and 1980s (global ...

Kaicun Wang; Robert E. Dickinson; Qian Ma; John A. Augustine; Martin Wild

2013-06-01T23:59:59.000Z

198

Observation Quality Control with a Robust Ensemble Kalman Filter  

Science Conference Proceedings (OSTI)

Current ensemble-based Kalman filter (EnKF) algorithms are not robust to gross observation errors caused by technical or human errors during the data collection process. In this paper, we consider two types of gross observational errors, additive ...

Soojin Roh; Marc G. Genton; Mikyoung Jun; Istvan Szunyogh; Ibrahim Hoteit

199

Observations of Quasi-Two-Dimensional Turbulence in Tidal Currents  

Science Conference Proceedings (OSTI)

Observational evidence for the existence of quasi-two-dimensional turbulence in tidal currents is derived from the auto- and cross-correlation spectra of vertically separated current meters. The observed quasi- two-dimensional turbulence seems to ...

C. Veth; J. T. F. Zimmerman

1981-10-01T23:59:59.000Z

200

Explicitly Accounting for Observation Error in Categorical Verification of Forecasts  

Science Conference Proceedings (OSTI)

Given an accurate representation of errors in observations it is possible to remove the effect of those errors from categorical verification scores. The errors in the observations are treated as additive white noise that is statistically ...

Neill E. Bowler

2006-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "observations classroom observations" 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

An Observing System Simulation Experiment for the Indian Ocean  

Science Conference Proceedings (OSTI)

An integrated in situ Indian Ocean observing system (IndOOS) is simulated using a high-resolution ocean general circulation model (OGCM) with daily mean forcing, including an estimate of subdaily oceanic variability derived from observations. The ...

Gabriel A. Vecchi; Matthew J. Harrison

2007-07-01T23:59:59.000Z

202

The Role of Operational Constraints in Selecting Supplementary Observations  

Science Conference Proceedings (OSTI)

Adaptive observation strategies in numerical weather prediction aim to improve forecasts by exploiting additional observations at locations that are themselves optimized with respect to the current state of the atmosphere. The role played by an ...

James A. Hansen; Leonard A. Smith

2000-09-01T23:59:59.000Z

203

Quality Control of Pre-1948 Cooperative Observer Network Data  

Science Conference Proceedings (OSTI)

A recent comprehensive effort to digitize U.S. daily temperature and precipitation data observed prior to 1948 has resulted in a major enhancement in the computer database of the records of the National Weather Service’s cooperative observer ...

Kenneth E. Kunkel; David R. Easterling; Kenneth Hubbard; Kelly Redmond; Karen Andsager; Michael C. Kruk; Michael L. Spinar

2005-11-01T23:59:59.000Z

204

Discontinuities due to Joining Precipitation Station Observations in Canada  

Science Conference Proceedings (OSTI)

When a climatological station is relocated or is closing, it is often possible to join the climate observations of a nearby site to create a longer time series. However, joining climate observations can sometimes introduce artificial ...

Lucie A. Vincent; Eva Mekis

2009-01-01T23:59:59.000Z

205

A simple methodology for observing fracture process of nano ...  

Science Conference Proceedings (OSTI)

A simple methodology for observing mechanical properties of nanocomposite Part 1: interfacial properties in an Epoxy Clay Nanocomposites. ...

206

Coastal Underwater Field Observer with Remote IP Access  

E-Print Network (OSTI)

Coastal Underwater Field Observer with Remote IP Access Joe Wilinski, Aaron Ganick, Alexander with continuous use of batteries. Costal Underwater Field Observer 9/16/09 #12;Boston University Slideshow Title? Wide angle Zoom Costal Underwater Field Observer #12;Boston University Slideshow Title Goes Here

Goldberg, Bennett

207

Effects of Secular Changes in Frequency of Observations and Observational Errors on Monthly Mean MSLP Summary Statistics Derived from ICOADS  

Science Conference Proceedings (OSTI)

A Monte Carlo technique has been employed to assess how sextile mean sea level pressure (MSLP) statistics derived from ship observations can be affected by changes in the frequency of observations. The results show that when the number of ...

Edmund K. M. Chang

2005-09-01T23:59:59.000Z

208

Observing Strategy and Observation Targeting for Tropical Cyclones Using Ensemble-Based Sensitivity Analysis and Data Assimilation  

Science Conference Proceedings (OSTI)

An ensemble Kalman filter data assimilation system for the Weather Research and Forecasting Model is used with ensemble-based sensitivity analysis to explore observing strategies and observation targeting for tropical cyclones. The case selected ...

Baoguo Xie; Fuqing Zhang; Qinghong Zhang; Jonathan Poterjoy; Yonghui Weng

2013-05-01T23:59:59.000Z

209

Assimilation of Satellite Infrared Radiances and Doppler Radar Observations during a Cool Season Observing System Simulation Experiment  

Science Conference Proceedings (OSTI)

An observing system simulation experiment is used to examine the impact of assimilating water vapor–sensitive satellite infrared brightness temperatures and Doppler radar reflectivity and radial velocity observations on the analysis accuracy of a ...

Thomas A. Jones; Jason A. Otkin; David J. Stensrud; Kent Knopfmeier

2013-10-01T23:59:59.000Z

210

EA-1964: National Ecological Observation Network (NEON) | Department of  

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

EA-1964: National Ecological Observation Network (NEON) EA-1964: National Ecological Observation Network (NEON) EA-1964: National Ecological Observation Network (NEON) SUMMARY The National Science Foundation (NSF) prepared an EA that evaluated potential environmental impacts of the proposed National Ecological Observation Network (NEON), a continental-scale network of long-term ecological infrastructure. DOE has evaluated and adopted the NSF EA to cover the NEON Project research activities on the Oak Ridge Reservation, and has issued a finding of no significant impact. PUBLIC COMMENT OPPORTUNITIES None available at this time. DOCUMENTS AVAILABLE FOR DOWNLOAD May 29, 2013 EA-1964: FInding of No Significant Impact National Ecological Observation Network May 29, 2013 EA-1964: Final Environmental Assessment National Ecological Observation Network

211

EA-1964: National Ecological Observation Network (NEON) | Department of  

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

964: National Ecological Observation Network (NEON) 964: National Ecological Observation Network (NEON) EA-1964: National Ecological Observation Network (NEON) SUMMARY The National Science Foundation (NSF) prepared an EA that evaluated potential environmental impacts of the proposed National Ecological Observation Network (NEON), a continental-scale network of long-term ecological infrastructure. DOE has evaluated and adopted the NSF EA to cover the NEON Project research activities on the Oak Ridge Reservation, and has issued a finding of no significant impact. PUBLIC COMMENT OPPORTUNITIES None available at this time. DOCUMENTS AVAILABLE FOR DOWNLOAD May 29, 2013 EA-1964: FInding of No Significant Impact National Ecological Observation Network May 29, 2013 EA-1964: Final Environmental Assessment National Ecological Observation Network

212

Observations of ubiquitous compressive waves in the Sun's chromosphere  

E-Print Network (OSTI)

The details of the mechanism(s) responsible for the observed heating and dynamics of the solar atmosphere still remain a mystery. Magnetohydrodynamic (MHD) waves are thought to play a vital role in this process. Although it has been shown that incompressible waves are ubiquitous in off-limb solar atmospheric observations their energy cannot be readily dissipated. We provide here, for the first time, on-disk observation and identification of concurrent MHD wave modes, both compressible and incompressible, in the solar chromosphere. The observed ubiquity and estimated energy flux associated with the detected MHD waves suggest the chromosphere is a vast reservoir of wave energy with the potential to meet chromospheric and coronal heating requirements. We are also able to propose an upper bound on the flux of the observed wave energy that is able to reach the corona based on observational constraints, which has important implications for the suggested mechanism(s) for quiescent coronal heating.

Morton, R J; Jess, D B; Kuridze, D; Ruderman, M S; Mathioudakis, M; Erdelyi, R

2013-01-01T23:59:59.000Z

213

Observation of GRBs by the MAGIC Telescope, Status and Outlook  

E-Print Network (OSTI)

Observation of Gamma Ray Bursts (GRBs) in the Very High Energy (VHE) domain will provide important information on the physical conditions in GRB outflows. The MAGIC telescope is the best suited Imaging Atmospheric Cherenkov Telescope (IACT) for these observations. Thanks to its fast repositioning time and low energy threshold, MAGIC is able to start quickly the follow-up observation, triggered by an alert from the GRB Coordinates Network (GCN), and observe the prompt emission and early afterglow phase from GRBs. In the last two years of operation several GRB follow-up observations were performed by MAGIC, however, until now without successful detection of VHE gamma rays above threshold energies >100 GeV. In this paper we revise the expectations for the GRB observations with MAGIC, based on the experience from the last years of operation.

D. Bastieri; N. Galante; M. Garczarczyk; M. Gaug; F. Longo; S. Mizobuchi; V. Scapin

2007-09-10T23:59:59.000Z

214

How Are You Observing Energy Awareness Month? | Department of Energy  

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

Are You Observing Energy Awareness Month? Are You Observing Energy Awareness Month? How Are You Observing Energy Awareness Month? October 7, 2010 - 7:30am Addthis October is Energy Awareness Month, and we think a great way to celebrate would be to make an improvement that gets you a tax credit. But there are plenty of other ways you could observe Energy Awareness Month help spread the word about saving energy. So tell us: How are you observing Energy Awareness Month? Each Thursday, you have the chance to share your thoughts on a question about energy efficiency or renewable energy for consumers. Please comment with your answers, and also feel free to respond to other comments. Addthis Related Articles How Will You Observe Energy Awareness Month? What Are You Doing to Fight Climate Change? How Do You Stay Cool and Comfortable in Hot Weather?

215

Correlations of experimental isotope shifts with spectroscopic and mass observables  

Science Conference Proceedings (OSTI)

Experimental differential observables relating to mean square charge radii, spectroscopic, and mass observables of even-even nuclei are presented for different regions in the nuclear chart. They exhibit remarkable correlations, not heretofore recognized, that provide a new perspective on structural evolution, especially in exotic nuclei. This can also be a guide for future measurements of charge radii, spectroscopic observables, and masses, as well as for future theoretical approaches.

Cakirli, R. B. [Max-Planck-Institut fuer Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg (Germany); Department of Physics, University of Istanbul, Istanbul (Turkey); Casten, R. F. [Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520 (United States); Blaum, K. [Max-Planck-Institut fuer Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg (Germany); Physikalisches Institut, Ruprecht-Karls-Universitaet Heidelberg, Philosophenweg 12, D-69120 Heidelberg (Germany)

2010-12-15T23:59:59.000Z

216

Calculation of fission observables through event-by-event simulation  

E-Print Network (OSTI)

The increased interest in more exclusive fission observables has demanded more detailed models. We present here a new computational model, FREYA, that aims to meet this need by producing large samples of complete fission events from which any observable of interest can then be extracted consistently, including arbitrary correlations. The various model assumptions are described and the potential utility of the model is illustrated by means of several novel correlation observables.

J. Randrup; R. Vogt

2009-06-06T23:59:59.000Z

217

Tropical anvil cirrus evolution from observations and numerical...  

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

cirrus evolution from observations and numerical simulations Deng, Min University of Utah Mace, Gerald University of Utah Category: Modeling The tropical anvil cirrus formation...

218

Observation Wells At Blue Mountain Area (Warpinski, Et Al., 2004...  

Open Energy Info (EERE)

navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Observation Wells At Blue Mountain Area (Warpinski, Et Al., 2004) Exploration Activity Details Location...

219

Observation Wells At East Brawley Area (Matlick & Jayne, 2008...  

Open Energy Info (EERE)

Login | Sign Up Search Page Edit History Facebook icon Twitter icon Observation Wells At East Brawley Area (Matlick & Jayne, 2008) Jump to: navigation, search GEOTHERMAL...

220

SUMMARY OF BEAM BEAM OBSERVATIONS DURING STORES IN RHIC.  

Science Conference Proceedings (OSTI)

During stores, the beam-beam interaction has a significant impact on the beam and luminosity lifetimes in RHIC. This was observed in heavy ion, and even more pronounced in proton collisions. Observations include measurements of beam-beam induced tune shifts, lifetime and emittance growth measurements with and without beam-beam interaction, and background rates as a function of tunes. In addition, RHIC is currently the only hadron collider in which strong-strong beam-beam effects can be seen. Coherent beam-beam modes were observed, and suppressed by tune changes. In this article we summarize the most important beam-beam observations made during stores so far.

FISCHER,W.

2003-05-19T23:59:59.000Z

Note: This page contains sample records for the topic "observations classroom observations" 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

The Manhattan Project: A 70th Anniversary Observance | OSTI,...  

Office of Scientific and Technical Information (OSTI)

OSTI has been making government R&D results open and transparent since 1947 The Manhattan Project: A 70th Anniversary Observance atomic energy molecule showing a nucleus...

222

An Observable Silene/Silylene Rearrangement in a Cationic Iridium ...  

An Observable Silene/Silylene Rearrangement in a Cationic Iridium Complex Steven R. Klei, T. Don Tilley,* and Robert G. Bergman* Department of Chemistry and Center ...

223

Experimental Observation of Energy Modulation in Electron Beams...  

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

OBSERVATION OF ENERGY MODULATION IN ELECTRON BEAMS PASSING THROUGH TERAHERTZ DIELECTRIC WAKEFIELD STRUCTURES* S. Antipov , C. Jing, P. Schoessow, and A. Kanareykin, Euclid...

224

Observing Climate with Satellites Are We on Thin Ice?  

Science Conference Proceedings (OSTI)

Observing Climate with Satellites Are We on Thin Ice? A glacial-melt stream on the top of the Greenland ice sheet in late summer. ...

2010-10-05T23:59:59.000Z

225

AAO support observations for the Hubble Deep Field Sout  

E-Print Network (OSTI)

We present proposed ground-based support observations at the AAO for the forthcoming Hubble Deep Field South (HDF-S) campaign.

B. J. Boyle

1998-04-09T23:59:59.000Z

226

Battery Electric Vehicle Driving and Charging Behavior Observed...  

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

Battery Electric Vehicle Driving and Charging Behavior Observed Early in The EV Project The EV Project John Smart, Idaho National Laboratory Stephen Schey, ECOtality North America...

227

Observation of Lithium Ions at Atomic Resolution Using an ...  

Science Conference Proceedings (OSTI)

Presentation Title, Observation of Lithium Ions at Atomic Resolution Using an ... at atomic resolution in several important electrode materials for Li-ion batteries.

228

Untrained Forward Observer (UFO) translator for call for fire .  

E-Print Network (OSTI)

??Many observers need indirect fire but are not proficient in Call for Fire, the procedure used to request indirect fire. To alleviate this, we propose… (more)

King, Regan R.

2013-01-01T23:59:59.000Z

229

An Observation System Using Both Optical Stitching and Video Geo ...  

home \\ technologies \\ optical stitching and video geo registration. Technologies: Ready-to-Sign Licenses: Software: Patents: An Observation System Using Both Optical ...

230

OCEANOGRAPHIC OBSERVATIONS IN BRISTOL BAY AND THE BERING SEA  

E-Print Network (OSTI)

381 OCEANOGRAPHIC OBSERVATIONS IN BRISTOL BAY AND THE BERING SEA 1939-41, USCGT Redwing L. o OCEANOGRAPHIC OBSERVATSONS IN BRBSTOL BAY AND THE BERING SEA 1939-41 (USCGT Redwing) by Felix Favorite, John W OBSERVATIONS IN BRISTOL BAY AND THE BERING SEA 1939-41 (USCGT Redwing) by Felix Favorite, John W. Schantz

231

Radiation Fog: A Comparison of Model Simulation with Detailed Observations  

Science Conference Proceedings (OSTI)

A one-dimensional model designed to study the formation, growth, and dissipation of radiation fog is described. The model is compared with detailed observations made at the 200-m tower at Cabauw in the Netherlands. This study we use observations ...

Peter G. Duynkerke

1991-02-01T23:59:59.000Z

232

Observed and CAM3 GCM Sea Surface Wind  

E-Print Network (OSTI)

Observed and CAM3 GCM Sea Surface Wind Speed Distributions: Characterization, Comparison, and Bias climatological surface wind speed probability density functions (PDFs) estimated from observations and use them to evaluate, for the first time, contemporaneous wind PDFs predicted by a GCM. The ob- servations include NASA

Zender, Charles

233

Cirriform Rotor Cloud Observed on a Canadian Arctic Ice Cap  

Science Conference Proceedings (OSTI)

A thin rotor cloud was observed on the lee side of Penny Ice Cap in the Canadian Arctic on 21 April 1996. The cloud consisted of thin cirriform layers, so that its motion was clearly observed. By means of time-lapse camera photography, the ...

Hisashi Ozawa; Kumiko Goto-Azuma; Koyuru Iwanami; Roy M. Koerner

1998-06-01T23:59:59.000Z

234

Recursive controllability and observability tests for large dynamic systems  

Science Conference Proceedings (OSTI)

Controllability and observability criteria for a linear stationary system are used to design recursive tests for slackening the computing system requirements for verification of the controllability and observability of large systems. Practical examples ... Keywords: 02.30.Yy+64.70.+p

E. Yu. Zybin; M. Sh. Misrikhanov; V. N. Ryabchenko

2006-05-01T23:59:59.000Z

235

Asymptotically efficient parameter estimation using quantized output observations  

Science Conference Proceedings (OSTI)

This paper studies identification of systems in which only quantized output observations are available. An identification algorithm for system gains is introduced that employs empirical measures from multiple sensor thresholds and optimizes their convex ... Keywords: Cramér-Rao bound, Efficient estimator, Quantized observation, System identification

Le Yi Wang; G. George Yin

2007-07-01T23:59:59.000Z

236

A Quality-Control Routine for Hourly Wind Observations  

Science Conference Proceedings (OSTI)

The quality of hourly wind speed and direction observations from 41 northeastern U.S. first-order weather stations is evaluated with regard to the recognition of individual observations that are either obviously in error or of suspect quality. An ...

Arthur T. DeGaetano

1997-04-01T23:59:59.000Z

237

ARM - Field Campaign - Water Cycle Pilot Study Intensive Observations  

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

govCampaignsWater Cycle Pilot Study Intensive Observations govCampaignsWater Cycle Pilot Study Intensive Observations Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Campaign : Water Cycle Pilot Study Intensive Observations 2002.04.01 - 2002.06.30 Lead Scientist : Marvin Wesely For data sets, see below. Description The U.S. DOE Water Cycle Pilot Study (WCPS) is a 3-year feasibility investigation focused on accurately evaluating the water cycle components and using stable isotopes as an effective tool in doing so. The study area is primarily the Whitewater subbasin in the Walnut River Watershed in southeastern Kansas. Two intensive observations periods are planned, this first one in April to June 2002 and a second currently scheduled for December 2002 to February 2003. Observations will be made of precipitation

238

Properties of tropical convection observed by ARM millimeter-radars  

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

Properties of tropical convection observed by ARM millimeter-radars Properties of tropical convection observed by ARM millimeter-radars Haynes, John Colorado State University Stephens, Graeme Colorado State University Category: Cloud Properties The results of an analysis of tropical cloud systems observed from a variety of vertically pointing radar systems are described. In particular, observations taken during five years of operation of the ARM millimeter wavelength radar system (MMCR) at Manus Island in the Tropical West Pacific region are characterized into cloud classes according to the radar reflectivity structures of these cloud systems, associated rainfall, and surface radiative properties. These observations of cloud properties are composited with respect to various phases of the Madden Julian Oscillation, which is a dominant mode of variability at Manus Island. A method of better

239

Radiosonde observations at Pt. Reyes and cloud properties retrieved from  

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

Radiosonde observations at Pt. Reyes and cloud properties retrieved from Radiosonde observations at Pt. Reyes and cloud properties retrieved from GOES-WEST Inoue, Toshiro MRI/JMA Category: Field Campaigns Low-level cloud formed off the west coast of continents plays an important role in general circulation and climate. Marine Stratus Radiation Aerosol and Drizzle (MASRAD) was conducted at the ARM mobile site deployed at Pt Reyes, California during April to September. Here, we studied the relationship between meteorological parameters observed by GPS sonde and cloud properties observed from GOES-WEST during the MASRAD intensive operational period. Cloud properties are retrieved from VISST (Visible Infrared Solar-infrared Split window Technique). The vertical profile of stability, relative humidity (RH) and wind speed observed by GPS sonde are

240

Observation Wells At Mccoy Geothermal Area (DOE GTP) | Open Energy  

Open Energy Info (EERE)

Observation Wells At Mccoy Geothermal Area (DOE GTP) Observation Wells At Mccoy Geothermal Area (DOE GTP) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Observation Wells At Mccoy Geothermal Area (DOE GTP) Exploration Activity Details Location Mccoy Geothermal Area Exploration Technique Observation Wells Activity Date Usefulness not indicated DOE-funding Unknown Notes 4 wells References (1 January 2011) GTP ARRA Spreadsheet Retrieved from "http://en.openei.org/w/index.php?title=Observation_Wells_At_Mccoy_Geothermal_Area_(DOE_GTP)&oldid=402599" Categories: Exploration Activities DOE Funded Activities ARRA Funded Activities What links here Related changes Special pages Printable version Permanent link Browse properties About us Disclaimers Energy blogs Linked Data Developer services

Note: This page contains sample records for the topic "observations classroom observations" 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

Assimilation of Standard and Targeted Observations within the Unstable Subspace of the Observation–Analysis–Forecast Cycle System  

Science Conference Proceedings (OSTI)

In this paper it is shown that the flow-dependent instabilities that develop within an observation–analysis–forecast (OAF) cycle and that are responsible for the background error can be exploited in a very simple way to assimilate observations. ...

Anna Trevisan; Francesco Uboldi

2004-01-01T23:59:59.000Z

242

Photometric observations from theoretical flip-flop models  

E-Print Network (OSTI)

Some active stars show a so-called flip-flop phenomenon in which the main spot activity periodically switches between two active longitudes that are 180 degrees apart. In this paper we study the flip-flop phenomenon by converting results from dynamo calculations into long-term synthetic photometric observations, which are then compared to the real stellar observations. We show that similar activity patterns as obtained from flip-flop dynamo calculations, can also be seen in the observations. The long-term light-curve behaviour seen in the synthesised data can be used for finding new stars exhibiting the flip-flop phenomenon.

H. Korhonen; D. Elstner

2005-06-13T23:59:59.000Z

243

OBSERVATIONAL EVIDENCE FOR DARK MATTER INTERACTING THROUGH A YUKAWA POTENTIAL  

SciTech Connect

Recent observations in galaxies and clusters indicate that dark matter density profiles exhibit core-like structures which contradict the numerical simulation results of collisionless cold dark matter (CDM). On the other hand, it has been shown that CDM particles interacting through a Yukawa potential could naturally explain the cores in dwarf galaxies. In this Letter, I use the Yukawa potential interacting dark matter model to derive two simple scaling relations on the galactic and cluster scales, respectively, which give excellent agreements with observations. Also, in our model, the masses of the force carrier and dark matter particle can be constrained by the observational data.

Chan, M. H., E-mail: mhchan@phy.cuhk.edu.hk [Department of Physics and Institute of Theoretical Physics, Chinese University of Hong Kong, Shatin, New Territories, Hong Kong (Hong Kong)

2013-05-20T23:59:59.000Z

244

KINEMATIC ORIGIN OF CORRELATIONS BETWEEN GAMMA-RAY BURST OBSERVABLES  

Science Conference Proceedings (OSTI)

Recently, several new correlations between gamma-ray burst (GRB) observables have been discovered. Like previously well-established correlations, they challenge GRB models. Here, we show that in the cannonball (CB) model of GRBs, the newly discovered correlations have the same simple kinematic origin as those discovered earlier. They all result from the strong dependence of the observed radiations on the Lorentz and Doppler factors of the jet of highly relativistic plasmoids (CBs) that produces the observed radiations by interaction with the medium through which it propagates.

Dado, Shlomo; Dar, Arnon, E-mail: dado@phep3.technion.ac.il, E-mail: arnon@physics.technion.ac.il [Physics Department, Technion, Haifa 32000 (Israel)

2012-04-20T23:59:59.000Z

245

How Will You Observe Energy Awareness Month? | Department of Energy  

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

Observe Energy Awareness Month? Observe Energy Awareness Month? How Will You Observe Energy Awareness Month? October 1, 2009 - 7:00am Addthis October is Energy Awareness Month! This year's theme, "A Sustainable Energy Future; Putting All the Pieces Together," encourages you to see yourself as a piece of a larger puzzle-fitting into the big picture, shaping our energy future, and moving our nation toward energy independence. Learn more about Energy Awareness Month and how you can download or order materials to help spread the word. How will you observe Energy Awareness Month? Each Thursday, you have the chance to share your thoughts on a question about energy efficiency or renewable energy for consumers. Please comment with your answers, and also feel free to respond to other comments.

246

Representation Error of Oceanic Observations for Data Assimilation  

Science Conference Proceedings (OSTI)

A simple approach to the estimation of representation error (RE) of sea level (?), temperature (T), and salinity (S) observations for ocean data assimilation is described. It is assumed that the main source of RE is due to unresolved processes ...

Peter R. Oke; Pavel Sakov

2008-06-01T23:59:59.000Z

247

The 1 August 1981 MOPE Storm: Observations and Modeling Results  

Science Conference Proceedings (OSTI)

Observations made by the T-28 armored research aircraft, radar, and other data sources were used to study an eastern Moutana hailstorm that developed on 1 August 1981 during the Cooperative Convective Precipitation Experiment season. The storm ...

Rooney S. Kubesh; Dennis J. Musil; Richard D. Farley; Harold D. Orville

1988-03-01T23:59:59.000Z

248

Relating Cirrus Cloud Properties to Observed Fluxes: A Critical Assessment  

Science Conference Proceedings (OSTI)

The accuracy needed in cirrus cloud scattering and microphysical properties is quantified such that the radiative effect on climate can he determined. Our ability to compute and observe these properties to within needed accuracies is assessed, ...

A. M. Vogelmann; T. P. Ackerman

1995-12-01T23:59:59.000Z

249

Automatic Cloud Tracking Applied to GOES and METEOSAT Observations  

Science Conference Proceedings (OSTI)

Improvements to the SRI automatic cloud-tracking system are described that enable it to operate on multilayer clouds associated with severe storms. The improved method has been tested using rapid-scan observations of Hurricane Eloise obtained by ...

Roy M. Endlich; Daniel E. Wolf

1981-03-01T23:59:59.000Z

250

A 94-GHz Doppler Radar for Cloud Observations  

Science Conference Proceedings (OSTI)

A Doppler radar operating at 3.2 mm wavelength was designed and assembled primarily for observation of clouds and precipitation. Phase detection of the radar signals which is required for Doppler operation is implemented through the use of a ...

Roger Lhermitte

1987-03-01T23:59:59.000Z

251

Observed Vegetation–Climate Feedbacks in the United States  

Science Conference Proceedings (OSTI)

Observed vegetation feedbacks on temperature and precipitation are assessed across the United States using satellite-based fraction of photosynthetically active radiation (FPAR) and monthly climate data for the period of 1982–2000. This study ...

M. Notaro; Z. Liu; J. W. Williams

2006-03-01T23:59:59.000Z

252

Combined Satellite- and Surface-Based Observations of Clouds  

Science Conference Proceedings (OSTI)

A new method for combining satellite and surface-based cloud observations into a self-consistent three-dimensional field is presented. This method derives the probabilities of the cloud states, which are most consistent with all of the ...

Bryan C. Weare

1999-03-01T23:59:59.000Z

253

ARM - Field Campaign - Observations and Modeling of the Green...  

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

of the Green Ocean Amazon: Year-to-Year Differences (GOAMAZON 2015) 2015.01.01, Martin, AMF Observations and Modeling of the Green Ocean Amazon Aerial Campaign 2014.02.15,...

254

Early Canadian Weather Observers and the “Year Without a Summer”  

Science Conference Proceedings (OSTI)

The unusual spring and summer weather of the year 1816 in central Canada is discussed using Canadian newspaper accounts together with manuscript records from early amateur weather observers. Many of the spectacular meteorological events of this ...

Kevin Hamilton

1986-05-01T23:59:59.000Z

255

Lidar Observation of Elevated Pollution Layers over Los Angeles  

Science Conference Proceedings (OSTI)

Elevated pollution layers are observed over Los Angeles with an aircraft equipped with a downward-looking lidar. For the first time, detailed ancillary upper-air kinematic and thermodynamic data were collected simultaneously to aid in the ...

Roger M. Wakimoto; James L. McElroy

1986-11-01T23:59:59.000Z

256

Simulating the Delaware Bay Buoyant Outflow: Comparison with Observations  

Science Conference Proceedings (OSTI)

Coastal buoyant outflows from rivers and estuaries previously have been studied with field research, laboratory experiments, and numerical models. There is a dire need to evaluate model performance in light of coastal current observations. This ...

Michael M. Whitney; Richard W. Garvine

2006-01-01T23:59:59.000Z

257

Theory and Observations of Controls on Lightning Flash Size Spectra  

Science Conference Proceedings (OSTI)

Previous analyses of very high frequency (VHF) Lightning Mapping Array (LMA) observations relative to the location of deep convective updrafts have noted a systematic pattern in flash characteristics. In and near strong updrafts, flashes tend to ...

Eric C. Bruning; Donald R. MacGorman

2013-12-01T23:59:59.000Z

258

Continuous-Time Distributed Observers with Discrete Communication  

E-Print Network (OSTI)

computation. Distributed estimation problems arise, for instance, in sensor networks, electric power grids data, and rely upon distributed mechanisms to merge local computations, such as intermediate dataContinuous-Time Distributed Observers with Discrete Communication Florian D¨orfler, Fabio

Bullo, Francesco

259

Elevation-Dependent Trends in Precipitation Observed during NAME  

Science Conference Proceedings (OSTI)

Radar data from the 2004 North American Monsoon Experiment (NAME) enhanced observing period were used to investigate diurnal trends and vertical structure of precipitating features relative to local terrain. Two-dimensional composites of ...

Angela K. Rowe; Steven A. Rutledge; Timothy J. Lang; Paul E. Ciesielski; Stephen M. Saleeby

2008-12-01T23:59:59.000Z

260

Observed Diurnal Cycle Climatology of Planetary Boundary Layer Height  

Science Conference Proceedings (OSTI)

An observational climatology of the planetary boundary layer height (PBLH) diurnal cycle, specific to surface characteristics, is derived from 58 286 fine-resolution soundings collected in 14 major field campaigns around the world. An objective ...

Shuyan Liu; Xin-Zhong Liang

2010-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "observations classroom observations" 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

Cirrus Infrared Parameters and Shortwave Reflectance Relations from Observations  

Science Conference Proceedings (OSTI)

A summary of experimental observations and analysis of cirrus from high-altitude aircraft remote sensing is presented. The vertical distribution of cirrus optical and infrared cross-section parameters and the relative effective emittance and ...

James D. Spinhirne; William D. Hart; Dennis L. Hlavka

1996-05-01T23:59:59.000Z

262

Observations from Space and Thermal Convection: A Historical Perspective  

Science Conference Proceedings (OSTI)

An abbreviated historical account of the evolution of the satellite meteorology program is presented. Emphasis is placed on the importance of the satellite and its space platform for observing and studying atmospheric convection. Particular ...

Ernest M. Agee

1984-09-01T23:59:59.000Z

263

On Determinations of Maximum Hailstone Sizes from Hallpad Observations  

Science Conference Proceedings (OSTI)

Reports of hailstones larger than those indicated by hailpad observations being found on the ground around the hailpad sites raise questions about the validity of maximum-size determinations. Data from the Grossversuch IV hailpad network ...

Paul L. Smith; Albert Waldvogel

1989-01-01T23:59:59.000Z

264

Radiation Energy Budget Studies Using Collocated AVHRR and ERBE Observations  

Science Conference Proceedings (OSTI)

Changes in the energy balance at the top of the atmosphere are specified as a function of atmospheric and surface properties using observations from the Advanced Very High Resolution Radiometer (AVURR) and the Earth Radiation budget Experiment (...

Steven A. Ackerman; Toshiro Inoue

1994-03-01T23:59:59.000Z

265

Experimental Observations of Internal Vortex Structures in Steady Baroclinic Waves  

Science Conference Proceedings (OSTI)

The basic structures of steady baroclinic waves observed in a differentially heated rotating-fluid annulus are well known to be composed of high and low pressure vortices, upper (eastward) and lower (westward) jet streams meandering through the ...

T. Tajima; T. Nakamura; T. Sakata

1997-06-01T23:59:59.000Z

266

Observations of Near-Inertial Waves in a Front  

Science Conference Proceedings (OSTI)

Near-inertial with horizontal scales O(10 km) dominate profiles of velocity finestructure collected in the North Pacific Subtropical Front during January 1980. Considerable spatial variability is observed. Two features in particular contain most ...

Eric Kunze; Thomas B. Sanford

1984-03-01T23:59:59.000Z

267

An Observational Study of Stratocumulus Entrainment and Thermodynamics  

Science Conference Proceedings (OSTI)

The marine stratocumulus regime is studied using observational data from the Dynamics and Chemistry of Marine Stratocumulus (DYCOMS) experiment. Such regions are climatically important because of their influence on the earth–atmosphere energy ...

S. R. Kawa; R. Pearson Jr.

1989-09-01T23:59:59.000Z

268

Multi-Spacecraft Observations: Stream Interactions and Associated Structures  

E-Print Network (OSTI)

the longitude, ? Sun the solar rotation angular speed, r thewithin one solar rotation when the Sun is very active, thefrom the Solar Wind Observations Over the Poles of the Sun (

Jian, L. K.; Russell, C. T.; Luhmann, J. G.; Galvin, A. B.; MacNeice, P. J.

2009-01-01T23:59:59.000Z

269

Tropical Cyclone Motion. A Comparison of Theory and Observation  

Science Conference Proceedings (OSTI)

The analytic predictions of tropical cyclone motion by Holland are shown to be in very good agreement with observations in the Australian southwest Pacific region. These results indicate that a combined linear asymmetric advection and divergence ...

Greg J. Holland

1984-01-01T23:59:59.000Z

270

An Assessment of Wave Observations from Ships in Southern Oceans  

Science Conference Proceedings (OSTI)

Observations of wind waves and swell from ship reports are investigated. Comparisons are made between estimates of wave parameters made from ships in southern oceans by calculating correlations as a function of ship separation, and analyzing the ...

A. K. Laing

1985-05-01T23:59:59.000Z

271

TRMM Radar Observations of Shallow Precipitation over the Tropical Oceans  

Science Conference Proceedings (OSTI)

Observations from the precipitation radar aboard the Tropical Rainfall Measuring Mission satellite provide the first opportunity to map vertical structure properties of rain over the entire Tropics and subtropics. Storm height histograms reveal a ...

David A. Short; Kenji Nakamura

2000-12-01T23:59:59.000Z

272

Estimation of TAMDAR Observational Error and Assimilation Experiments  

Science Conference Proceedings (OSTI)

Tropospheric Airborne Meteorological Data Reporting (TAMDAR) observations are becoming a major data source for numerical weather prediction (NWP) because of the advantages of their high spatiotemporal resolution and humidity measurements. In this ...

Feng Gao; Xiaoyan Zhang; Neil A. Jacobs; Xiang-Yu Huang; Xin Zhang; Peter P. Childs

2012-08-01T23:59:59.000Z

273

Hydraulic Physical Modeling and Observations of a Severe Gap Wind  

Science Conference Proceedings (OSTI)

Strong gap winds in Howe Sound, British Columbia, are simulated using a small-scale physical model. Model results are presented and compared with observations recorded in Howe Sound during a severe gap wind event in December 1992. Hydraulic ...

Timothy D. Finnigan; Jason A. Vine; Peter L. Jackson; Susan E. Allen; Gregory A. Lawrence; Douw G. Steyn

1994-12-01T23:59:59.000Z

274

Longwave Cloud Radiative Forcing as Determined from Nimbus-7 Observations  

Science Conference Proceedings (OSTI)

Collocated and coincident cloud and outgoing longwave radiation observations taken by experiments on board the Nimbus-7 satellite have been used to infer the daytime longwave cloud-radiative forcing. Through the specification of a time-series of ...

Philip E. Ardanuy; Larry L. Stowe; Arnold Gruber; Mitchell Weiss; Craig S. Long

1989-08-01T23:59:59.000Z

275

Antarctic Meteorological Observations on the GTS during the FROST Project  

Science Conference Proceedings (OSTI)

An assessment is made of the availability of Antarctic synoptic observations on the World Meteorological Organization (WMO) Global Telecommunication System (GTS) during the trial periods (5–9 July 1993 and 1–15 February 1994) and winter and ...

Steven Colwell; John Turner

1999-12-01T23:59:59.000Z

276

Observing-Systems Simulation Experiments: Past, Present, and Future  

Science Conference Proceedings (OSTI)

A summary of the history of observing-systems simulation experiments (OSSEs) is presented together with a description of current methodology, its capabilities and limitations, and considerations for the design of future experiments. These ...

Charles P. Arnold Jr.; Clifford H. Dey

1986-06-01T23:59:59.000Z

277

Cloud Model-Based Simulation of Spaceborne Radar Observations  

Science Conference Proceedings (OSTI)

Simulations of observations from potential spaceborne radars are made based on storm structure generated from the three-dimensional (3D) Goddard cumulus ensemble model simulation of an intense overland convective system. Five frequencies of 3, 10,...

H-Y. M. Yeh; N. Prasad; R. Meneghini; W-K. Tao; J. A. Jones; R. F. Adler

1995-01-01T23:59:59.000Z

278

Analysis of Land Skin Temperature Using AVHRR Observations  

Science Conference Proceedings (OSTI)

Using satellite remote sensing techniques to take quantitative observations of the climate system will advance our knowledge and ability to model the climate system and its changes. Polar-orbiting satellite records of global land surface skin ...

Menglin Jin

2004-04-01T23:59:59.000Z

279

First Observations of Microbaroms with Single Absolute Barometers  

Science Conference Proceedings (OSTI)

The first observations of microbaroms with single absolute barometers are presented and discussed. Microbaroms are pulses of atmospheric infrasound emitted by ocean surface waves. They can propagate over thousands of kilometers through the ...

Ganesh K. Subramanian; Andreas Muschinski

2011-07-01T23:59:59.000Z

280

Overland Precipitation Estimation from TRMM Passive Microwave Observations  

Science Conference Proceedings (OSTI)

Procedures for passive microwave precipitation estimation over land are investigated based on a large database of Tropical Rainfall Measuring Mission (TRMM) observations. The procedures include components for rain area delineation, convective/...

Mircea Grecu; Emmanouil N. Anagnostou

2001-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "observations classroom observations" 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

Structure and Life Cycle of Microburst Outflows Observed in Colorado  

Science Conference Proceedings (OSTI)

Intense, small-scale divergent outflows known as microbursts are held responsible for a number of aircraft accidents. This paper describes the morphology of microburst outflows observed in Colorado. Outflows are categorized into morphological ...

Mark R. Hjelmfelt

1988-08-01T23:59:59.000Z

282

Thermodynamic Properties of Mesoscale Convective Systems Observed during BAMEX  

Science Conference Proceedings (OSTI)

Dropsonde observations from the Bow Echo and Mesoscale Convective Vortex Experiment (BAMEX) are used to document the spatiotemporal variability of temperature, moisture, and wind within mesoscale convective systems (MCSs). Onion-type sounding ...

James Correia Jr.; Raymond W. Arritt

2008-11-01T23:59:59.000Z

283

ARM - Field Campaign - The ARM Pilot Radiation Observation Experiment...  

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

govCampaignsThe ARM Pilot Radiation Observation Experiment (PROBE) Comments? We would love to hear from you Send us a note below or call us at 1-888-ARM-DATA. Send Campaign : The...

284

Integrating spacecraft and aircraft in Earth Observation System architectures  

E-Print Network (OSTI)

The Global Earth Observation System (GEOS) is the essential data gathering network that enables the advancement of Earth science. In recent years, efforts have been made to understand the major GEOS architectural tradeoffs. ...

Suarez, Brandon H

2011-01-01T23:59:59.000Z

285

Empirical Localization of Observation Impact in Ensemble Kalman Filters  

Science Conference Proceedings (OSTI)

Localization is a method for reducing the impact of sampling errors in ensemble Kalman filters. Here, the regression coefficient, or gain, relating ensemble increments for observed quantity y to increments for state variable x is multiplied by a ...

Jeffrey Anderson; Lili Lei

286

Current Icing Potential: Algorithm Description and Comparison with Aircraft Observations  

Science Conference Proceedings (OSTI)

The “current icing potential” (CIP) algorithm combines satellite, radar, surface, lightning, and pilot-report observations with model output to create a detailed three-dimensional hourly diagnosis of the potential for the existence of icing and ...

Ben C. Bernstein; Frank McDonough; Marcia K. Politovich; Barbara G. Brown; Thomas P. Ratvasky; Dean R. Miller; Cory A. Wolff; Gary Cunning

2005-07-01T23:59:59.000Z

287

Mantle Echoes Associated with Deep Convection: Observations and Numerical Simulations  

Science Conference Proceedings (OSTI)

Finescale radar observations of intense thermals/starting plumes, during the early stages of precipitation formation, were collected by an airborne Doppler radar on two separate days. The radar data were recorded as the aircraft flew underneath ...

Roger M. Wakimoto; Hanne V. Murphey; Robert G. Fovell; Wen-Chau Lee

2004-07-01T23:59:59.000Z

288

Observations of Vertical Wind Shear Heterogeneity in Convective Boundary Layers  

Science Conference Proceedings (OSTI)

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

Paul Markowski; Yvette Richardson

2007-03-01T23:59:59.000Z

289

Press Pass - Press Release - DZero ZZ diboson observation  

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

the ZZ diboson make its discovery an essential prelude to finding or excluding the Higgs boson at the Tevatron. The observation of the ZZ, announced at a Fermilab seminar on July...

290

The Effect of Clouds on Air Showers Observation from Space  

E-Print Network (OSTI)

Issues relating to extensive air showers observation by a space-borne fluorescence detector and the effects of clouds on the observations are investigated using Monte Carlo simulation. The simulations assume the presence of clouds with varying altitudes and optical depths. Simulated events are reconstructed assuming a cloud-free atmosphere. While it is anticipated that auxiliary instruments, such as LIDAR (LIght Detection And Ranging), will be employed to measure the atmospheric conditions during actual observation, it is still possible that these instruments may fail to recognize the presence of a cloud in a particular shower observation. The purpose of this study is to investigate the effects on the reconstructed shower parameters in such cases. Reconstruction results are shown for both monocular and stereo detectors and for the two limiting cases of optically thin, and optically thick clouds.

T. Abu-Zayyad; C. C. H. Jui; E. C. Loh

2003-10-28T23:59:59.000Z

291

Soil Moisture Modeling Based on Multiyear Observations in the Sahel  

Science Conference Proceedings (OSTI)

Two simple soil moisture models useful for drought monitoring and climate change studies were proposed, based on 4-yr ground observations of root-zone soil moisture in Sahelian Niger. One is a water balance model that calculates soil moisture ...

Y. Yamaguchi; M. Shinoda

2002-11-01T23:59:59.000Z

292

An Observational and Prognostic Numerical Investigation of Complex Terrain Dispersion  

Science Conference Proceedings (OSTI)

The Atmospheric Studies in Complex Terrain Program conducted a field experiment at the interface of the Rocky Mountains and the Great Plains in the winter of 1991. Extensive meteorological observations were taken in northeastern Colorado near ...

Gregory S. Poulos; James E. Bossert

1995-03-01T23:59:59.000Z

293

Dendritic Patterns in Tropical Cumulus: An Observational Analysis  

Science Conference Proceedings (OSTI)

An observational analysis of the structure and synoptic setting of tropical dendritic cumulus formations was undertaken using 30 months of global data from the Moderate Resolution Imaging Spectroradiometer aboard the National Aeronautics and ...

Stephen D. Nicholls; George S. Young

2007-05-01T23:59:59.000Z

294

Convective Impact on Temperatures Observed near the Tropical Tropopause  

Science Conference Proceedings (OSTI)

Observed temperature trends and interannual variations near the tropical tropopause suggest that temperatures up to the cold point are controlled by the troposphere, but some models indicate otherwise. Here, previous investigations of thermal ...

Steven C. Sherwood; Takeshi Horinouchi; Heidi A. Zeleznik

2003-08-01T23:59:59.000Z

295

Observations of Liquid Water in Orographic Clouds over Elk Mountain  

Science Conference Proceedings (OSTI)

The relatively simple orographic clouds forming in winter over Elk Mountain, Wyoming provided useful opportunities for field studies of cloud formation and of ice crystal development. In this paper, the observations of cloud droplet populations ...

Marcia K. Politovich; Gabor Vali

1983-05-01T23:59:59.000Z

296

Arctic Precipitation and Evaporation: Model Results and Observational Estimates  

Science Conference Proceedings (OSTI)

Observational estimates of precipitation and evaporation over the Arctic Ocean and its terrestrial watersheds are compared with corresponding values from the climate model simulations of the Atmospheric Model Intercomparison Project (AMIP). ...

John E. Walsh; Vladimir Kattsov; Diane Portis; Valentin Meleshko

1998-01-01T23:59:59.000Z

297

Theory and observations of controls on lightning flash size spectra  

Science Conference Proceedings (OSTI)

Previous analyses of VHF Lightning Mapping Array (LMA) observations relative to the location of deep convective updrafts have noted a systematic pattern in flash characteristics. In and near strong updrafts, flashes tend to be smaller and more ...

Eric C. Bruning; Donald R. MacGorman

298

Local Air–Sea Relationship in Observations and Model Simulations  

Science Conference Proceedings (OSTI)

The present study compares the local simultaneous correlation between rainfall–evaporation and sea surface temperature (SST)–SST tendency among observations, coupled general circulation model (CGCM) simulations, and stand-alone atmospheric ...

Renguang Wu; Ben P. Kirtman; Kathy Pegion

2006-10-01T23:59:59.000Z

299

Comprehensive Automated Quality Assurance of Daily Surface Observations  

Science Conference Proceedings (OSTI)

This paper describes a comprehensive set of fully automated quality assurance (QA) procedures for observations of daily surface temperature, precipitation, snowfall, and snow depth. The QA procedures are being applied operationally to the Global ...

Imke Durre; Matthew J. Menne; Byron E. Gleason; Tamara G. Houston; Russell S. Vose

2010-08-01T23:59:59.000Z

300

Thermohaline Stratification of the Indonesian Seas: Model and Observations  

Science Conference Proceedings (OSTI)

The Indonesian Throughflow, weaving through complex topography, drawing water from near the division of the North Pacific and South Pacific water mass fields, represents a severe challenge to modeling efforts. Thermohaline observations within the ...

Arnold L. Gordon; Julie L. McClean

1999-02-01T23:59:59.000Z

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


301

Helicopter Observations of the Sea Breeze over a Coastal Area  

Science Conference Proceedings (OSTI)

Thermodynamical observations by a helicopter have been conducted to study the internal structure of the sea breeze blowing inland from Tosa Bay during three periods (September 1993, November 1994 and 1995). Inland-intrusion distances of the ...

Osamu Chiba; Fumiaki Kobayashi; Gen’ichi Naito; Koji Sassa

1999-04-01T23:59:59.000Z

302

Secondary Cyclogenesis—Comparison of Observations and Theory  

Science Conference Proceedings (OSTI)

A case study of a small-scale polar front cyclone observed during the Canadian Atlantic Storms Program (CASP) is presented. The cyclone forms along an essentially two-dimensional front, which is in approximate thermal wind balance. This ...

R. Paul Ford; G. W. Kent Moore

1990-02-01T23:59:59.000Z

303

Ooishi's Observation: Viewed in the Context of Jet Stream Discovery  

Science Conference Proceedings (OSTI)

Although aircraft encounters with strong westerly winds during World War II provided the stimulus for postwar research on the jet stream, Wasaburo Ooishi observed these winds in the 1920s. Ooishi's work is reviewed in the context of earlier work ...

John M. Lewis

2003-03-01T23:59:59.000Z

304

Microsoft PowerPoint - GNEP PARTNERS CANDIDATE PARTNERS AND OBSERVERS...  

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

Euratom Attending Candidate Partner and Observer Countries 1. Argentina 2. Belgium 3. Brazil 4. Canada 5. Czech 6. Egypt 7. Finland 8. Germany 9. Italy 10. Mexico 11. Morocco 12....

305

Regional Variability in Tropical Convection: Observations from TRMM  

Science Conference Proceedings (OSTI)

Observation of the vertical profile of precipitation over the global Tropics is a key objective of the Tropical Rainfall Measuring Mission (TRMM) because this information is central to obtaining vertical profiles of latent heating. This study ...

Walter A. Petersen; Steven A. Rutledge

2001-09-01T23:59:59.000Z

306

Finescale Radar Observations of Tornado and Mesocyclone Structures  

Science Conference Proceedings (OSTI)

A variety of vortex configurations observed at finescale with Doppler On Wheels (DOW) radars in and near the hook echoes of supercell thunderstorms are described. These include marginal/weak tornadoes, often with no documented condensation funnels,...

Joshua Wurman; Karen Kosiba

2013-10-01T23:59:59.000Z

307

Observations of a Cloud Are Triggered by Thunderstorm Outflow  

Science Conference Proceedings (OSTI)

This paper presents aircraft, radar, satellite and rawinsonde observations which describe a cloud am formed by moist downdraft outflow from a cumulonimbus cluster in northwest Kansas. Aircraft cross sections are presented of four variables at 160 ...

David A. Matthews

1981-10-01T23:59:59.000Z

308

Monthly Evapotranspiration from Satellite and Conventional Meteorological Observations  

Science Conference Proceedings (OSTI)

Monthly mean satellite measurements of surface heating rate, surface temperature, and normalized difference vegetation index were collected for seven locations in Kansas. These were combined with monthly average surface observations and used in a ...

J. D. Tarpley

1994-05-01T23:59:59.000Z

309

The Arm Program's Water Vapor Intensive Observation Periods  

Science Conference Proceedings (OSTI)

A series of water vapor intensive observation periods (WVIOPs) were conducted at the Atmospheric Radiation Measurement (ARM) site in Oklahoma between 1996 and 2000. The goals of these WVIOPs are to characterize the accuracy of the operational ...

H. E. Revercomb; D. D. Turner; D. C. Tobin; R. O. Knuteson; W. F. Feltz; J. Barnard; J. Bösenberg; S. Clough; D. Cook; R. Ferrare; J. Goldsmith; S. Gutman; R. Halthore; B. Lesht; J. Liljegren; H. Linné; J. Michalsky; V. Morris; W. Porch; S. Richardson; B. Schmid; M. Splitt; T. Van Hove; E. Westwater; D. Whiteman

2003-02-01T23:59:59.000Z

310

The Mysteries of Mammatus Clouds: Observations and Formation Mechanisms  

Science Conference Proceedings (OSTI)

Mammatus clouds are an intriguing enigma of atmospheric fluid dynamics and cloud physics. Most commonly observed on the underside of cumulonimbus anvils, mammatus also occur on the underside of cirrus, cirrocumulus, altocumulus, altostratus, and ...

David M. Schultz; Katharine M. Kanak; Jerry M. Straka; Robert J. Trapp; Brent A. Gordon; Dusan S. Zrni?; George H. Bryan; Adam J. Durant; Timothy J. Garrett; Petra M. Klein; Douglas K. Lilly

2006-10-01T23:59:59.000Z

311

Personal Computers, Weather Observations, and the National Climatic Data Center  

Science Conference Proceedings (OSTI)

The personal computer (PC) has become an important part of meteorological observing, telecommunications, forecasting, research, and data-management systems. The National Climatic Data Center (NCDC) is the nation's quality-control and archival ...

Richard Heim Jr.

1988-05-01T23:59:59.000Z

312

Observations of Ship Tracks from Ship-Based Platforms  

Science Conference Proceedings (OSTI)

Ship-based measurements in June 1994 provided information about ship-track clouds and associated atmospheric environment observed from below cloud levels that provide a perspective different from satellite and aircraft measurements. Surface ...

W. Porch; R. Borys; P. Durkee; R. Gasparovic; W. Hooper; E. Hindman; K. Nielsen

1999-01-01T23:59:59.000Z

313

Global Annual Temperature Anomalies from Land and Ocean Observations...  

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

Temperature Anomalies from Land and Ocean Observations, 1880-2012 image data Data Graphics Graphics Reference Hansen, J.E., R. Ruedy, M. Sato, and K. Lo. 2013. NASA GISS...

314

Observations of Gamma-Ray Bursts at Extreme Energies.  

E-Print Network (OSTI)

??Gamma-ray bursts (GRBs), thought to be produced by the core-collapse of massive stars or merging compact objects, are the most luminous events observed since the… (more)

Aune, Taylor

2012-01-01T23:59:59.000Z

315

A Comparison of Adaptive Observing Guidance for Atlantic Tropical Cyclones  

Science Conference Proceedings (OSTI)

Airborne adaptive observations have been collected for more than two decades in the neighborhood of tropical cyclones, to attempt to improve short-range forecasts of cyclone track. However, only simple subjective strategies for adaptive ...

S. J. Majumdar; S. D. Aberson; C. H. Bishop; R. Buizza; M. S. Peng; C. A. Reynolds

2006-09-01T23:59:59.000Z

316

Interpretation of Adaptive Observing Guidance for Atlantic Tropical Cyclones  

Science Conference Proceedings (OSTI)

Adaptive observing guidance products for Atlantic tropical cyclones are compared using composite techniques that allow one to quantitatively examine differences in the spatial structures of the guidance maps and relate these differences to the ...

C. A. Reynolds; M. S. Peng; S. J. Majumdar; S. D. Aberson; C. H. Bishop; R. Buizza

2007-12-01T23:59:59.000Z

317

On the Deterministic Observation Impact Guidance: A Geometrical Perspective  

Science Conference Proceedings (OSTI)

An optimal use of the atmospheric data in numerical weather prediction requires an objective assessment of the value added by observations to improve the analyses and forecasts of a specific data assimilation system (DAS). This research brings ...

Dacian N. Daescu

2009-10-01T23:59:59.000Z

318

Droplet activation properties of organic aerosols observed at...  

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

activation properties of organic aerosols observed at an urban site during CalNex-LA Fan Mei, 1,7 Patrick L. Hayes, 2,3 Amber Ortega, 2,3 Jonathan W. Taylor, 4 James D. Allan,...

319

Microsoft PowerPoint - GNEP PARTNERS CANDIDATE PARTNERS AND OBSERVERS...  

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

Publications GNEP Partners and Observers Microsoft PowerPoint - 5.3 Item 01 Top Kill Operation Status 09 June 1400.pptx Microsoft PowerPoint - Book and Journal Formsv2wButton.ppt...

320

A New Frontal Instability: Theory and ERICA Observations  

Science Conference Proceedings (OSTI)

A short-wave instability theory is applied to secondary waves on a narrow cold-front rainband observed during the Experiment on Rapidly Intensifying Cyclones over the Atlantic (ERICA). The basic mean state is approximated by the parabolic, ...

Nathan Paldor; Ching-Hwang Liu; Michael Ghil; Roger M. Wakimoto

1994-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "observations classroom observations" 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

Lidar Observations of Banded Convection during BLX83  

Science Conference Proceedings (OSTI)

Lidar observations of clear-air convection during the 1983 Boundary Layer Experiment (BLX83) reveal the presence of elongated, parallel regions of updrafts marked by enhanced aerosol backscattering. These linear (banded) aerosol structures were ...

R. A. Ferrare; J. L. Schols; E. W. Eloranta; R. Coulter

1991-03-01T23:59:59.000Z

322

Tracer Transport by the Diabatic Circulation Deduced from Satellite Observations  

Science Conference Proceedings (OSTI)

Mean meridional circulations for the months of November through May 1979 are deduced from the net radiative heating rates obtained from detailed calculations based on satellite observations of temperature and radiatively important trace species. ...

S. Solomon; J. T. Kiehl; R. R. Garcia; W. Grose

1986-08-01T23:59:59.000Z

323

Capturing the content of physics: systems, observables, and experiments  

Science Conference Proceedings (OSTI)

We present a content markup language for physics realized by extending the OMDoc format by an infrastructure for the principal concepts of physics: observables, physical systems, and experiments. The formalization of the description ...

Eberhard R. Hilf; Michael Kohlhase; Heinrich Stamerjohanns

2006-08-01T23:59:59.000Z

324

A Study of Hail Growth Utilizing Observed Storm Conditions  

Science Conference Proceedings (OSTI)

Hail growth is studied in the Westplains, Colorado, storm for which a variety of observations were collected. Measurements from a triple-Doppler radar network and a penetrating aircraft are used to synthesize fields of liquid water content and ...

G. Brant Foote

1984-01-01T23:59:59.000Z

325

Optical Observations of Lightning from a High-Altitude Airplane  

Science Conference Proceedings (OSTI)

Lightning has been observed from above cloud top by using satellites, balloons, rockets, and high-altitude airplanes, each of which provides a unique perspective and holds the potential for gaining new understanding of lightning phenomena. During ...

H. J. Christian; S. J. Goodman

1987-12-01T23:59:59.000Z

326

Crisis in Cosmology : Observational Constraints on Omega and H_0  

E-Print Network (OSTI)

Thanks to new technology of observations and fresh inputs from particle physics, cosmology has advanced on both observational and theoretical fronts. It is therefore opportune that we take stock of the cosmological situation today and examine the observational and theoretical constraints as they are now. The bottom line in this review is that despite the availability of the cosmological constant as an extra parameter for flat Friedmann models, the allowed parameter space for such models is very small. The observations that we consider here include the ages of globular clusters, measurement of Hubble's constant, abundance of rich clusters of galaxies, fraction of mass contributed by baryons in rich clusters and abundance of high redshift objects.

J. S. Bagla; T. Padmanabhan; J. V. Narlikar

1995-11-22T23:59:59.000Z

327

Observation of a Macroscopically Quantum-Entangled Insulator  

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

Observation of a Macroscopically Quantum-Entangled Insulator Print It has recently been proposed that insulators with large band gaps and strong spin-orbit coupling can host a new...

328

Hydrometeor Retrieval Accuracy Using Microwave Window and Sounding Channel Observations  

Science Conference Proceedings (OSTI)

The retrieval errors of cloud and precipitation hydrometeor contents from spaceborne observations are estimated at microwave frequencies in atmospheric windows between 18 and 150 GHz and in oxygen absorption complexes near 50–60 and 118 GHz. The ...

Peter Bauer; Emmanuel Moreau; Sabatino Di Michele

2005-07-01T23:59:59.000Z

329

Observing geomagnetic induction in magnetic satellite measurements and associated  

E-Print Network (OSTI)

Observing geomagnetic induction in magnetic satellite measurements and associated implications in the midlatitude satellite passes lower than 50 degrees geomagnetic latitude. At higher latitudes, auroral: Satellite induction. Index Terms: 1515 Geomagnetism and Paleomagnetism: Geomagnetic induction; 3914 Mineral

Constable, Steve

330

Realizing the Potential of Vehicle-Based Observations  

Science Conference Proceedings (OSTI)

The potential availability of millions of surface observations from passenger vehicles and fleets represents a potentially significant opportunity for the weather community. The success of this opportunity rests with the weather community's technical ...

William P. Mahoney III; James M. O'Sullivan

2013-07-01T23:59:59.000Z

331

Observable signatures of general relativistic dynamics in compact binaries  

E-Print Network (OSTI)

The effects of general relativity (GR) in astrophysical systems are often difficult to calculate, but they can have important consequences for observables. This thesis considers the impact of previously-ignored GR effects ...

Lang, Ryan N. (Ryan Nathan)

2009-01-01T23:59:59.000Z

332

Constraining Microwave Brightness Temperatures by Radar Brightband Observations  

Science Conference Proceedings (OSTI)

Multichannel microwave sensors make it possible to construct physically based rainfall retrieval algorithms. In these schemes, errors arising from the inaccuracy of the physical modeling of the cloud system under observation have to be accounted ...

A. Battaglia; C. Kummerow; Dong-Bin Shin; C. Williams

2003-06-01T23:59:59.000Z

333

Observations of the Internal Tide in Monterey Canyon  

Science Conference Proceedings (OSTI)

Data from two shipboard experiments in 1994, designed to observe the semidiurnal internal tide in Monterey Canyon, reveal semidiurnal currents of about 20 cm s?1, which is an order of magnitude larger than the estimated barotropic tidal currents. ...

Emil T. Petruncio; Leslie K. Rosenfeld; Jeffrey D. Paduan

1998-10-01T23:59:59.000Z

334

Kinematics of the Secondary Eyewall Observed in Hurricane Rita (2005)  

Science Conference Proceedings (OSTI)

Airborne Doppler radar data collected from the concentric eyewalls of Hurricane Rita (2005) provide detailed three-dimensional kinematic observations of the secondary eyewall feature. The secondary eyewall radar echo shows a ring of heavy ...

Anthony C. Didlake Jr.; Robert A. Houze Jr.

2011-08-01T23:59:59.000Z

335

Observation and Measurement of Solidification Phenomena at High ...  

Science Conference Proceedings (OSTI)

The double hot thermocouple technique (DHTT) that can be used to study .... and the cell-tip stability observed in Fe-83C was in good agreement with the theory ...

336

A Method for Combining Passive Microwave and Infrared Rainfall Observations  

Science Conference Proceedings (OSTI)

Passive microwave observations of rainfall offer the ability to obtain very accurate instantaneous estimates of rainfall. Because passive microwave instruments are confined to polar-orbiting satellites, however, such estimates must interpolate ...

Christian Kummerow; Louis Giglio

1995-02-01T23:59:59.000Z

337

Observations of Gamma-Ray Bursts at Extreme Energies  

E-Print Network (OSTI)

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

Aune, Taylor

2012-01-01T23:59:59.000Z

338

Ocean Response to a Hurricane. Part I: Observations  

Science Conference Proceedings (OSTI)

The response of the ocean to hurricanes was investigated using aircraft-deployable expendable current profilers (AXCP). The goals were to observe and separate the surface wave and surface mixed layer (SML) velocities under the storms and to map ...

Thomas B. Sanford; Peter G. Black; James R. Haustein; James W. Feeney; George Z. Forristall; James F. Price

1987-11-01T23:59:59.000Z

339

An Observationally Generated A Priori Database for Microwave Rainfall Retrievals  

Science Conference Proceedings (OSTI)

The combination of active and passive microwave sensors on board the Tropical Rainfall Measuring Mission (TRMM) satellite have been used to construct observationally constrained databases of precipitation profiles for use in passive microwave ...

Christian D. Kummerow; Sarah Ringerud; Jody Crook; David Randel; Wesley Berg

2011-02-01T23:59:59.000Z

340

Observations of Thermohaline Convection adjacent to Brunt Ice Shelf  

Science Conference Proceedings (OSTI)

Observations were made of ocean microstructure and horizontal currents adjacent to Brunt Ice Shelf in the southeastern Weddell Sea. Periods of in situ supercooled water extending as deep as 65 m were associated with ice nucleation and frazil ...

Ilker Fer; Keith Makinson; Keith W. Nicholls

2012-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "observations classroom observations" 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

Extracting the Dominant SST Modes Impacting North America's Observed Climate  

Science Conference Proceedings (OSTI)

The seasonal impacts of the dominant sea surface temperature (SST) modes to North American climate are assessed comprehensively in observations using the multivariate generalized equilibrium feedback assessment (GEFA) method. The GEFA method is ...

Fuyao Wang; Zhengyu Liu; Michael Notaro

2013-08-01T23:59:59.000Z

342

Aircraft Observations of Ice Crystal Evolution in an Altostratus Cloud  

Science Conference Proceedings (OSTI)

Observations from a Lagrangian spiral descent within altostratus cloud associated with a cold front were used to study the evolution of ice particle spectra by following populations of ice crystals as they fell through the cloud. The flight track ...

Paul R. Field

1999-06-01T23:59:59.000Z

343

Late Pleistocene Ice Age Scenarios Based on Observational Evidence  

Science Conference Proceedings (OSTI)

Ice age scenarios for the last glacial-interglacial cycle, based on observations of Boyle and Keigwin concerning the North Atlantic thermohaline circulation and of Barnola et al. concerning atmospheric C02 variations derived from the Vostok ice ...

G. DeBlonde; W. R. Peltier

1993-04-01T23:59:59.000Z

344

Observations of Polarity Reversal in Shoaling Nonlinear Internal Waves  

Science Conference Proceedings (OSTI)

Observations off the New Jersey coast document the shoaling of three groups of nonlinear internal waves of depression over 35 km across the shelf. Each wave group experienced changing background conditions along its shoreward transit. Despite ...

E. L. Shroyer; J. N. Moum; J. D. Nash

2009-03-01T23:59:59.000Z

345

Property:GBIG/ObservationEndDate | Open Energy Information  

Open Energy Info (EERE)

ObservationEndDate Jump to: navigation, search This is a property of type String. Retrieved from "http:en.openei.orgwindex.php?titleProperty:GBIGObservationEndDate&oldid5093...

346

Information-Disturbance Theorem for Mutually Unbiased Observables  

E-Print Network (OSTI)

We derive a novel version of information-disturbance theorems for mutually unbiased observables. We show that the information gain by Eve inevitably makes the outcomes by Bob in the conjugate basis not only erroneous but random.

Takayuki Miyadera; Hideki Imai

2006-02-05T23:59:59.000Z

347

Combined System for Observations of Tropospheric and Stratospheric Thin Clouds  

Science Conference Proceedings (OSTI)

A balloonborne sonde and a polarization lidar have been developed to make combined observations of thin tropospheric and stratospheric clouds. In their first application these instruments have been used in a campaign organized to study Antarctic ...

A. Adriani; G. P. Gobbi; M. Viterbini; S. Ugazio

1993-02-01T23:59:59.000Z

348

Observations of Boundary Mixing over the Continental Slope  

Science Conference Proceedings (OSTI)

Observations of mixing over the continental slope using a towed body reveal a great lateral extent (several kilometers) of continuously turbulent fluid within a few hundred meters of the boundary at depth 1600 m. The largest turbulent dissipation ...

J. N. Moum; D. R. Caldwell; J. D. Nash; G. D. Gunderson

2002-07-01T23:59:59.000Z

349

Climatological Observations and Predicted Sublimation Rates at Lake Hoare, Antarctica  

Science Conference Proceedings (OSTI)

In December 1985, an automated meteorological station was established at Lake Hoare in the dry valley region of Antarctica. Here, we report on the first year-round observations available for any site in Taylor Valley. This dataset augments the ...

Gary D. Clow; Christopher P. McKay; George M. Simmons Jr.; Robert A. Wharton Jr.

1988-07-01T23:59:59.000Z

350

Equatorial Atlantic Velocity and Temperature Observations: February–November 1981  

Science Conference Proceedings (OSTI)

Upper ocean velocity and temperature measurements were obtained in the central equatorial Atlantic using surface moored current meters from February to November 1981. Distinct seasonal variations were observed in the zonal momentum and ...

R. H. Weisberg

1985-05-01T23:59:59.000Z

351

ARM - Field Campaign - Routine AAF CLOWD Optical Radiative Observations  

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

govCampaignsRoutine AAF CLOWD Optical Radiative Observations (RACORO) govCampaignsRoutine AAF CLOWD Optical Radiative Observations (RACORO) Campaign Links RACORO Website Related Campaigns Surface Radiation Comparison Transfer Measurements for RACORO 2009.01.20, Long, SGP Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Campaign : Routine AAF CLOWD Optical Radiative Observations (RACORO) 2009.01.22 - 2009.06.30 Website : http://acrf-campaign.arm.gov/racoro/ Lead Scientist : Andrew Vogelmann For data sets, see below. Description The ARM Aerial Facility (AAF) supported the Routine AAF Clouds with Low Optical Water Depths (CLOWD) Optical Radiative Observations (RACORO) field campaign, led by principal investigator Andrew Vogelmann. During this long-term campaign, the AAF conducted routine flights at the ACRF Southern

352

Some Observations of Snowfall and Meteorological Conditions in Arctic Canada  

Science Conference Proceedings (OSTI)

Observations of snow crystals were made in mid-winter at Inuvik, N.W.T., Canada, in order to study the snow crystal of cold temperature type. The following results were obtained:

Choji Magono; Katsuhiro Kikuchi

1980-10-01T23:59:59.000Z

353

Observations of Supercooled Raindrops in New Mexico Summertime Cumuli  

Science Conference Proceedings (OSTI)

Observations made in 1987 with the NCAR King Air aircraft and in 1993 with the New Mexico Institute of Mining and Technology dual-polarization radar have revealed the presence of supercooled raindrops in some New Mexico summertime cumulus clouds. ...

Alan M. Blyth; Rasmus E. Benestad; Paul R. Krehbiel; John Latham

1997-02-01T23:59:59.000Z

354

Observer-based fault detection for nuclear reactors  

E-Print Network (OSTI)

This is a study of fault detection for nuclear reactor systems. Basic concepts are derived from fundamental theories on system observers. Different types of fault- actuator fault, sensor fault, and system dynamics fault ...

Li, Qing, 1972-

2001-01-01T23:59:59.000Z

355

Airborne Doppler Lidar Observations of Convective Phenomena in Oklahoma  

Science Conference Proceedings (OSTI)

On 30 June 1981, the wind fields around a variety of convective clouds, ranging from large thunderstorm complexes to isolated cumulus congestus, were observed in Oklahoma using an airborne Doppler lidar operated by the National Aeronautics and ...

Eugene W. McCaul Jr.; Howard B. Bluestein; Richard J. Doviak

1987-09-01T23:59:59.000Z

356

Comparing Model-produced Convective Cloudiness with Observations  

Science Conference Proceedings (OSTI)

Convective cloudiness generated by a cumulus parameterization scheme of a large-scale numerical weather prediction model was compared with analyses of clouds observed by geosynchronous satellites. The comparisons were performed over an equatorial ...

D. C. Norquist; C. Yang

1992-05-01T23:59:59.000Z

357

Observations of the Leeuwin Current off Western Australia  

Science Conference Proceedings (OSTI)

Shipboard observations made in May 1982 showed a definite poleward surface flow (the Leeuwin Current) over the West Australian shelf from 22°S to 28°S. The surface current was relatively fresh, warm, low in dissolved oxygen concentration, and ...

Rory O. R. Y. Thompson

1984-03-01T23:59:59.000Z

358

GPS–Cellular Drifter Technology for Coastal Ocean Observing Systems  

Science Conference Proceedings (OSTI)

A drifter for observing small spatial and temporal scales of motion in the coastal zone is presented. The drifter uses GPS to determine its position, and the Mobitex terrestrial cellular communications system to transmit the position data in near–...

J. Carter Ohlmann; Peter F. White; Andrew L. Sybrandy; P. Peter Niiler

2005-09-01T23:59:59.000Z

359

Cloud Top Liquid Water from Lidar Observations of Marine Stratocumulus  

Science Conference Proceedings (OSTI)

Maine stratus clouds were simultaneously observed by nadir Nd:YAG lidar measurements and in situ cloud physics measurements. A procedure was applied to derive the two-dimensional vertical cross section of the liquid water from within the cloud ...

J. D. Spinhirne; R. Boers; W. D. Hart

1989-02-01T23:59:59.000Z

360

Earth Observation Business Network (EOBN), Vancouver, Canada, May 2002.  

E-Print Network (OSTI)

This paper examines some of the reasons that have contributed to this situation, and explores ways in which international co-operation in space observation can be improved, proposing both a short and a medium term agenda for collaboration. Our analysis is based on a framework that enables an assessment of international collaborative programs in earth observation, by considering the relative importance of the factors affecting a country's decision to engage in a co-operative program

Making International Collaboration; Gilberto Câmara; Director For Earth Observation

2002-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "observations classroom observations" 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

Events and observables in generally invariant spacetime theories  

E-Print Network (OSTI)

We address the problem of observables in generally invariant spacetime theories such as Einstein's general relativity. Using the refined notion of an event as a ``point-coincidence'' between scalar fields that completely characterise a spacetime model, we propose a generalisation of the relational local observables that does not require the existence of four everywhere invertible scalar fields. The collection of all point-coincidences forms in generic situations a four-dimensional manifold, that is naturally identified with the physical spacetime.

Hans Westman; Sebastiano Sonego

2007-08-14T23:59:59.000Z

362

Initial Observations of Sunspot Oscillations Excited by Solar Flare  

E-Print Network (OSTI)

Observations of a large solar flare of December 13, 2006, using Solar Optical Telescope (SOT) on Hinode spacecraft revealed high-frequency oscillations excited by the flare in the sunspot chromosphere. These oscillations are observed in the region of strong magnetic field of the sunspot umbra, and may provide a new diagnostic tool for probing the structure of sunspots and understanding physical processes in solar flares.

Kosovichev, A G

2007-01-01T23:59:59.000Z

363

Extremely long hard bursts observed by Konus-Wind  

SciTech Connect

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

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

2008-05-22T23:59:59.000Z

364

Optimal observation time window for forecasting the next earthquake  

Science Conference Proceedings (OSTI)

We report that the accuracy of predicting the occurrence time of the next earthquake is significantly enhanced by observing the latest rate of earthquake occurrences. The observation period that minimizes the temporal uncertainty of the next occurrence is on the order of 10 hours. This result is independent of the threshold magnitude and is consistent across different geographic areas. This time scale is much shorter than the months or years that have previously been considered characteristic of seismic activities.

Omi, Takahiro; Shinomoto, Shigeru [Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502 (Japan); Kanter, Ido [Minerva Center and Department of Physics, Bar-Ilan University, Ramat-Gan, 52900 (Israel)

2011-02-15T23:59:59.000Z

365

DK And: Reclassification as EW Binary from CCD Observations  

E-Print Network (OSTI)

This paper describes the reclassification of DK And, formerly classified as a RRc type star, as EW binary. 1599 CCD unfiltered and filtered (V and R band) observations between 1999 and 2005 show, that the star is actually an eclipsing binary star with a period of P = 0.4892224 +/- 0.0000002 [d] with epoch E0 = 2451435.4353 +/- 0.0010 (if all historic data were taken into account). From our new observations 12 timings of minimum light are given.

F. -J. Hambsch; D. Husar

2006-07-26T23:59:59.000Z

366

Recommended observational skills training for IAEA safeguards inspections. Final report: Recommended observational skills training for IAEA safeguards inspections  

SciTech Connect

This is the second of two reports prepared to assist the International Atomic Energy Agency (IAEA or Agency) in enhancing the effectiveness of its international safeguards inspections through inspector training in {open_quotes}Observational Skills{close_quotes}. The first (Phase 1) report was essentially exploratory. It defined Observational Skills broadly to include all appropriate cognitive, communications, and interpersonal techniques that have the potential to help IAEA safeguards inspectors function more effectively. It identified 10 specific Observational Skills components, analyzed their relevance to IAEA safeguards inspections, and reviewed a variety of inspection programs in the public and private sectors that provide training in one or more of these components. The report concluded that while it should be possible to draw upon these other programs in developing Observational Skills training for IAEA inspectors, the approaches utilized in these programs will likely require significant adaption to support the specific job requirements, policies, and practices that define the IAEA inspector`s job. The overall objective of this second (Phase 2) report is to provide a basis for the actual design and delivery of Observational Skills training to IAEA inspectors. The more specific purposes of this report are to convey a fuller understanding of the potential application of Observational Skills to the inspector`s job, describe inspector perspectives on the relevance and importance of particular Observational Skills, identify the specific Observational Skill components that are most important and relevant to enhancing safeguards inspections, and make recommendations as to Observational Skills training for the IAEA`s consideration in further developing its Safeguards training program.

Toquam, J.L.; Morris, F.A.

1994-09-01T23:59:59.000Z

367

A cooperative control algorithm for camera based observational systems.  

SciTech Connect

Over the last several years, there has been considerable growth in camera based observation systems for a variety of safety, scientific, and recreational applications. In order to improve the effectiveness of these systems, we frequently desire the ability to increase the number of observed objects, but solving this problem is not as simple as adding more cameras. Quite often, there are economic or physical restrictions that prevent us from adding additional cameras to the system. As a result, we require methods that coordinate the tracking of objects between multiple cameras in an optimal way. In order to accomplish this goal, we present a new cooperative control algorithm for a camera based observational system. Specifically, we present a receding horizon control where we model the underlying optimal control problem as a mixed integer linear program. The benefit of this design is that we can coordinate the actions between each camera while simultaneously respecting its kinematics. In addition, we further improve the quality of our solution by coupling our algorithm with a Kalman filter. Through this integration, we not only add a predictive component to our control, but we use the uncertainty estimates provided by the filter to encourage the system to periodically observe any outliers in the observed area. This combined approach allows us to intelligently observe the entire region of interest in an effective and thorough manner.

Young, Joseph G.

2012-01-01T23:59:59.000Z

368

First e-VLBI observations of GRS 1915+105  

E-Print Network (OSTI)

We present results from the first successful open call e-VLBI science run, observing the X-ray binary GRS 1915+105. e-VLBI science allows the rapid production of VLBI radio maps, within hours of an observation rather than weeks, facilitating a decision for follow-up observations. A total of 6 telescopes observing at 5 GHz across the European VLBI Network (EVN) were correlated in real time at the Joint Institute for VLBI in Europe (JIVE). Constant data rates of 128 Mbps were transferred from each telescope, giving 4 TB of raw sampled data over the 12 hours of the whole experiment. Throughout this, GRS 1915+105 was observed for a total of 5.5 hours, producing 2.8 GB of visibilities of correlated data. A weak flare occurred during our observations, and we detected a slightly resolved component of 2.7 x 1.2 milliarcsecond with a position angle of 140 (+/-2) degrees. The peak brightness was 10.2 mJy per beam, with a total integrated radio flux of 11.1 mJy.

A. Rushton; R. E. Spencer; M. Strong; R. M. Campbell; S. Casey; R. P. Fender; M. A. Garrett; J. C. A. Miller-Jones; G. G. Pooley; C. Reynolds; A. Szomoru; V. Tudose; Z. Paragi

2006-11-02T23:59:59.000Z

369

OBSERVATIONS OF RECONNECTING FLARE LOOPS WITH THE ATMOSPHERIC IMAGING ASSEMBLY  

SciTech Connect

Perhaps the most compelling evidence for the role of magnetic reconnection in solar flares comes from the supra-arcade downflows that have been observed above many post-flare loop arcades. These downflows are thought to be related to highly non-potential field lines that have reconnected and are propagating away from the current sheet. We present new observations of supra-arcade downflows taken with the Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory (SDO). The morphology and dynamics of the downflows observed with AIA provide new evidence for the role of magnetic reconnection in solar flares. With these new observations we are able to measure downflows originating at larger heights than in previous studies. We find, however, that the initial velocities measured here ({approx}144 km s{sup -1}) are well below the Alfven speed expected in the lower corona, and consistent with previous results. We also find no evidence that the downflows brighten with time, as would be expected from chromospheric evaporation. These observations suggest that simple two-dimensional models cannot explain the detailed observations of solar flares.

Warren, Harry P.; Sheeley, Neil R. Jr. [Space Science Division, Naval Research Laboratory, Washington, DC 20375 (United States); O'Brien, Casey M. [Also at Massachusetts Institute of Technology, Cambridge, MA 02139, USA. (United States)

2011-12-01T23:59:59.000Z

370

Numerical Study of an Observed Orogenic Mesoscale Convective System. Part 1: Simulated Genesis and Comparison with Observations  

Science Conference Proceedings (OSTI)

The interaction of topographically induced thermally and mechanically driven diurnal flow regimes in the lee of the Rockies is shown to lead to the growth of a mesoscale convective system (MCS). An organic MCS observed during the 1977 combined ...

Gregory J. Tripoli; William R. Cotton

1989-02-01T23:59:59.000Z

371

An Observational and Numerical Study of a Sheared, Convective Boundary Layer. Part I: Phoenix II Observations, Statistical Description, and Visualization  

Science Conference Proceedings (OSTI)

Four-dimensional velocity fields derived from dual Doppler radar observations are the basis of a description and statistical analysis of a convective, sheared planetary boundary layer during an afternoon over the High Plains of eastern Colorado. ...

Jeanne M. Schneider; Douglas K. Lilly

1999-09-01T23:59:59.000Z

372

Accounting for Observational Uncertainty in Forecast Verification: An Information-Theoretical View on Forecasts, Observations, and Truth  

Science Conference Proceedings (OSTI)

Recently, an information-theoretical decomposition of Kullback–Leibler divergence into uncertainty, reliability, and resolution was introduced. In this article, this decomposition is generalized to the case where the observation is uncertain. ...

Steven V. Weijs; Nick van de Giesen

2011-07-01T23:59:59.000Z

373

Observation of low magnetic field density peaks in helicon plasma  

SciTech Connect

Single density peak has been commonly observed in low magnetic field (<100 G) helicon discharges. In this paper, we report the observations of multiple density peaks in low magnetic field (<100 G) helicon discharges produced in the linear helicon plasma device [Barada et al., Rev. Sci. Instrum. 83, 063501 (2012)]. Experiments are carried out using argon gas with m = +1 right helical antenna operating at 13.56 MHz by varying the magnetic field from 0 G to 100 G. The plasma density varies with varying the magnetic field at constant input power and gas pressure and reaches to its peak value at a magnetic field value of {approx}25 G. Another peak of smaller magnitude in density has been observed near 50 G. Measurement of amplitude and phase of the axial component of the wave using magnetic probes for two magnetic field values corresponding to the observed density peaks indicated the existence of radial modes. Measured parallel wave number together with the estimated perpendicular wave number suggests oblique mode propagation of helicon waves along the resonance cone boundary for these magnetic field values. Further, the observations of larger floating potential fluctuations measured with Langmuir probes at those magnetic field values indicate that near resonance cone boundary; these electrostatic fluctuations take energy from helicon wave and dump power to the plasma causing density peaks.

Barada, Kshitish K.; Chattopadhyay, P. K.; Ghosh, J.; Kumar, Sunil; Saxena, Y. C. [Institute for Plasma Research, Bhat, Gandhinagar 382428 (India)

2013-04-15T23:59:59.000Z

374

Control Landscapes for Observable Preparation with Open Quantum Systems  

E-Print Network (OSTI)

A quantum control landscape is defined as the observable as a function(al) of the system control variables. Such landscapes were introduced to provide a basis to understand the increasing number of successful experiments controlling quantum dynamics phenomena. This paper extends the concept to encompass the broader context of the environment having an influence. For the case that the open system dynamics are fully controllable, it is shown that the control landscape for open systems can be lifted to the analysis of an equivalent auxiliary landscape of a closed composite system that contains the environmental interactions. This inherent connection can be analyzed to provide relevant information about the topology of the original open system landscape. Application to the optimization of an observable expectation value reveals the same landscape simplicity observed in former studies on closed systems. In particular, no false sub-optimal traps exist in the system control landscape when seeking to optimize an observable, even in the presence of complex environments. Moreover, a quantitative study of the control landscape of a system interacting with a thermal environment shows that the enhanced controllability attainable with open dynamics significantly broadens the range of the achievable observable values over the control landscape.

Rebing Wu; Alexander Pechen; Herschel Rabitz; Michael Hsieh; Benjamin Tsou

2007-08-16T23:59:59.000Z

375

Refractive aiming corrections for satellite observation of stars  

SciTech Connect

Standard references describe how apparent zenith angles differ from true zenith angles for observers on the Earth. In fact, correction formulae are available for aiming Earth-based sensors at stars; some corrections give variations as a function of observer altitude. Such corrections have not been available for observers in space. This report develops formulae appropriate for proper aiming from space-based sensors toward the relatively few stars that are near the Earth`s limb at any given time. These formulae correct for refractive effects and may be critical for steerable space-borne sensors with fields of view less than one degree, tasked to observe starlight passing near the Earth`s surface. Ray tracing in the U.S. Standard Atmosphere, 1976 including H{sub 2}O effects, is used to determine relations between the refracted tangent height, the apparent tangent height resulting from observation at the sensor, and the angle through which the detected rays have deviated. Analytic fits of the ray deviation as a function of apparent tangent height allows quick determination of corrections needed for a space-borne sensor. Using those results that apply in the plane of incidence and using the necessary coordinate rotations, alterations in the star`s apparent right ascension and declination are evaluated to improve the aim. Examples illustrate that alterations can be larger than one degree, with effects lasting up to a few minutes.

Vittitoe, C.N.; Schmidt, R.L.

1997-03-01T23:59:59.000Z

376

Observational signatures of Jordan-Brans-Dicke theories of gravity  

E-Print Network (OSTI)

We analyze the Jordan-Brans-Dicke model (JBD) of gravity, where deviations from General Relativity (GR) are described by a scalar field non-minimally coupled to gravity. The theory is characterized by a constant coupling parameter, $\\omega_{\\rm JBD}$; GR is recovered in the limit $\\omega_{\\rm JBD} \\to \\infty$. In such theories, gravity modifications manifest at early times, so that one cannot rely on the usual approach of looking for inconsistencies in the expansion history and perturbations growth in order to discriminate between JBD and GR. However, we show that a similar technique can be successfully applied to early and late times observables instead. Cosmological parameters inferred extrapolating early-time observations to the present will match those recovered from direct late-time observations only if the correct gravity theory is used. We use the primary CMB, as will be seen by the Planck satellite, as the early-time observable; and forthcoming and planned Supernov{\\ae}, Baryonic Acoustic Oscillations and Weak Lensing experiments as late-time observables. We find that detection of values of $\\omega_{\\rm JBD}$ as large as 500 and 1000 is within reach of the upcoming (2010) and next-generation (2020) experiments, respectively.

Viviana Acquaviva; Licia Verde

2007-09-01T23:59:59.000Z

377

Collaboration yields 'The Right Glasses' for observing mystery behavior  

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

Observing mystery behavior In electrons Observing mystery behavior In electrons Collaboration yields 'The Right Glasses' for observing mystery behavior in electrons The research may lead to a better understanding of superconductors or development of better materials for powering high-speed electronics. December 13, 2007 Los Alamos National Laboratory sits on top of a once-remote mesa in northern New Mexico with the Jemez mountains as a backdrop to research and innovation covering multi-disciplines from bioscience, sustainable energy sources, to plasma physics and new materials. Los Alamos National Laboratory sits on top of a once-remote mesa in northern New Mexico with the Jemez mountains as a backdrop to research and innovation covering multi-disciplines from bioscience, sustainable energy

378

Observations on A Technology Roadmap for Generation IV Nuclear Energy  

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

Observations on A Technology Roadmap for Generation IV Nuclear Observations on A Technology Roadmap for Generation IV Nuclear Energy Systems: Technical Roadmap Report Observations on A Technology Roadmap for Generation IV Nuclear Energy Systems: Technical Roadmap Report The development of advanced nuclear energy systems in the U.S. will depend greatly on the continued success of currently operating light water nuclear power plants and the ordering of new installations in the short term. DOE needs to give those immediate objectives the highest priority and any additional support they require to assure their success. DOE is pursuing two initiatives to encourage a greater use of nuclear energy systems. The initiatives have been reviewed by NERAC Subcommittee on Generation IV Technology Planning (GRNS) and they are: * A Near Term Development (NTD) Roadmap which is in the process of being

379

ARM - Field Campaign - Biomass Burning Observation Project - BBOP  

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

govCampaignsBiomass Burning Observation Project - BBOP govCampaignsBiomass Burning Observation Project - BBOP Campaign Links BNL BBOP Website ARM Aerial Facility Payload Science Plan Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Campaign : Biomass Burning Observation Project - BBOP 2013.07.01 - 2013.10.24 Website : http://campaign.arm.gov/bbop/ Lead Scientist : Larry Kleinman For data sets, see below. Description This field campaign will address multiple uncertainties in aerosol intensive properties, which are poorly represented in climate models, by means of aircraft measurements in biomass burning plumes. Key topics to be investigated are: Aerosol mixing state and morphology Mass absorption coefficients (MACs) Chemical composition of non-refractory material associated with

380

Title: Radar-observed convective characteristics during TWP-ICE  

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

Title: Radar-observed convective characteristics during TWP-ICE Title: Radar-observed convective characteristics during TWP-ICE Schumacher, Courtney Texas A&M University Houze, Robert University of Washington May, Peter Bureau or Meteorology Research Centre Frederick, Kaycee Cetrone, Jasmine Vallgren, Andreas Category: Field Campaigns This poster will describe the radar dataset obtained in the Tropical Warm Pool International Cloud Experiment (TWP-ICE), which is to take place 20 January - 14 February 2006 in the vicinity of Darwin, Australia. We will describe the convective systems observed during the project by two scanning C-band Doppler radars, one of which will provide dual-polarization measurements, and ARM's vertically pointing cloud radar and lidar installations. In addition, we will discuss the potential for combining

Note: This page contains sample records for the topic "observations classroom observations" 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

Temporal Velocity Variations beneath the Coso Geothermal Field Observed  

Open Energy Info (EERE)

Velocity Variations beneath the Coso Geothermal Field Observed Velocity Variations beneath the Coso Geothermal Field Observed using Seismic Double Difference Tomography of Compressional and Shear Wave Arrival Times Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: Temporal Velocity Variations beneath the Coso Geothermal Field Observed using Seismic Double Difference Tomography of Compressional and Shear Wave Arrival Times Details Activities (1) Areas (1) Regions (0) Abstract: Microseismic imaging can be an important tool for characterizing geothermal reservoirs. Since microseismic sources occur more or less continuously both due to the operations of a geothermal field and the naturally occurring background seismicity, passive seismic monitoring is well suited to quantify the temporal variations in the vicinity of a

382

Observation of a Macroscopically Quantum-Entangled Insulator  

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

Observation of a Macroscopically Observation of a Macroscopically Quantum-Entangled Insulator Observation of a Macroscopically Quantum-Entangled Insulator Print Wednesday, 27 May 2009 00:00 It has recently been proposed that insulators with large band gaps and strong spin-orbit coupling can host a new phase of quantum matter called a topological insulator that is characterized by entangled wavefunctions. The proposal has now been realized by an international collaboration led by researchers from Princeton University who studied the electronic structure of insulating alloys of bismuth and antimony by means of angle-resolved photoemission spectroscopy (ARPES) and spin-resolved ARPES. Their results constitute the first direct experimental evidence of a topological insulator in nature that is fully quantum entangled. In the future, a detailed study of topological order and quantum entanglement using their method can potentially pave the way for fault-tolerant (topological) quantum computing.

383

ARM - Publications: Science Team Meeting Documents: Observations of Natural  

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

Observations of Natural Variability in Marine Stratocumulus Clouds Observations of Natural Variability in Marine Stratocumulus Clouds Albrecht, Bruce University of Miami Kollias, Pavlos RSMAS/University of Miami Jo, Ieng Rosentiel School of Marine & Atmospheric Science Ghate, Virendra RSMAS/Univ. Miami Serpetzoglou, Efthymious Minnis, Patrick NASA Langley Research Center Sun-Mack, Szedung SAIC Large to mesoscale features affecting the albedo of marine stratocumulus clouds are observed frequently and can have a substantial impact on the overall albedo of the subtropical cloud decks. One such naturally occurring feature-defined as a cloud rift-is characterized as a large-scale, persistent area of broken, low reflectivity stratocumulus clouds usually surrounded by a solid deck of stratocumulus. We review results from a

384

Sample Observations from the 2001.Multi-Frequency Radar IOP  

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

Sample Observations from the 2001 Sample Observations from the 2001 Multi-Frequency Radar IOP C. R. Williams Cooperative Institute for Research in Environmental Sciences University of Colorado Boulder, Colorado C. R. Williams and K. S. Gage National Oceanic and Atmospheric Administration Aeronomy Laboratory Boulder, Colorado L. Leon and S. Cruz-Pol University of Puerto Rico Mayaguez Campus S. M. Sekelsky Microwave Remote Sensing Laboratory University of Massachusetts Amherst, Massachusetts Introduction The 2001 Multi-Frequency Radar Intensive Operational Period (IOP) was designed to collect a long dataset of W-band (95 GHz), Ka-band (35 GHz), and S-band (2.8 GHz) vertical profiling observations to investigate insect scattering and precipitating particle scattering above the Southern Great Plains

385

Observation of the First Excited State in 23O  

E-Print Network (OSTI)

The first excited state in neutron-rich 23O was observed in a (2p1n) knock-out reaction from 26Ne on a beryllium target at a beam energy of 86 MeV/A. The state is unbound with respect to neutron emission and was reconstructed from the invariant mass from the 22O fragment and the neutron. It is unbound by 45(2) keV corresponding to an excitation energy of 2.8(1) MeV. The non-observation of further resonances implies a predominantly direct reaction mechanism of the employed three-nucleon-removal reaction which suggests the assignment of the observed resonance to be the 5/2+ hole state.

N. Frank; A. Schiller; T. Baumann; D. Bazin; J. Brown; P. A. DeYoung; J. E. Finck; A. Gade; J. Hinnefeld; R. Howes; J. -L. Lecouey; B. Luther; W. A. Peters; H. Scheit; M. Thoennessen

2007-08-20T23:59:59.000Z

386

Plasma Heating Suring a Coronal Mass Ejection Observed by SOHO  

E-Print Network (OSTI)

We perform a time-dependent ionization analysis to constrain plasma heating requirements during a fast partial halo coronal mass ejection (CME) observed on 2000 June 28 by the Ultraviolet Coronagraph Spectrometer (UVCS) aboard the Solar and Heliospheric Observatory (SOHO). We use two methods to derive densities from the UVCS measurements, including a density sensitive O V line ratio at 1213.85 and 1218.35 Angstroms, and radiative pumping of the O VI 1032,1038 doublet by chromospheric emission lines. The most strongly constrained feature shows cumulative plasma heating comparable to or greater than the kinetic energy, while features observed earlier during the event show cumulative plasma heating comparable to or less than the kinetic energy. SOHO Michelson Doppler Imager (MDI) observations are used to estimate the active region magnetic energy. We consider candidate plasma heating mechanisms and provide constraints when possible. Because this CME was associated with a relatively weak flare, the contribution b...

Murphy, N A; Korreck, K E

2011-01-01T23:59:59.000Z

387

Maximal Beable Subalgebras of Quantum-Mechanical Observables  

E-Print Network (OSTI)

Given a state on an algebra of bounded quantum-mechanical observables (the self-adjoint part of a C*-algebra), we investigate those subalgebras that are maximal with respect to the property that the given state's restriction to the subalgebra is a mixture of dispersion-free states---what we call maximal "beable" subalgebras (borrowing a terminology due to J. S. Bell). We also extend our investigation to the theory of algebras of unbounded observables (as developed by R. Kadison), and show how our results articulate a solid mathematical foundation for central tenets of the orthodox Copenhagen interpretation of quantum theory (such as the joint indeterminacy of canonically conjugate observables, and Bohr's defense of the completeness of quantum theory against the argument of Einstein, Podolsky, and Rosen).

Hans Halvorson; Rob Clifton

1999-05-13T23:59:59.000Z

388

Observations of chemical differentiation in clumpy molecular clouds  

E-Print Network (OSTI)

We have extensively mapped a sample of dense molecular clouds (L1512, TMC-1C, L1262, Per 7, L1389, L1251E) in lines of HC3N, CH3OH, SO and C^{18}O. We demonstrate that a high degree of chemical differentiation is present in all of the observed clouds. We analyse the molecular maps for each cloud, demonstrating a systematic chemical differentiation across the sample, which we relate to the evolutionary state of the cloud. We relate our observations to the cloud physical, kinematical and evolutionary properties, and also compare them to the predictions of simple chemical models. The implications of this work for understanding the origin of the clumpy structures and chemical differentiation observed in dense clouds are discussed.

J. V. Buckle; S. D. Rodgers; E. S. Wirström; S. B. Charnley; A. J. Markwick-Kemper; H. M. Butner; S. Takakuwa

2007-04-09T23:59:59.000Z

389

Observation of Coherence in the Photosystem II Reaction Center  

E-Print Network (OSTI)

Photosynthesis powers life on our planet. The basic photosynthetic architecture comprises antenna complexes to harvest solar energy and reaction centers to convert the energy into a stable charge separated state. In oxygenic photosynthesis, the initial charge separation event occurs in the photosystem II reaction center; the only known natural enzyme that uses solar energy to split water. Energy transfer and charge separation in photosynthesis are rapid and have high quantum efficiencies. Recently, nonlinear spectroscopic experiments have suggested that electronic coherence may play a role in energy transfer efficiency in antenna complexes. Here we report the observation of coherence in the photosystem II reaction center by two dimensional electronic spectroscopy. The frequencies of the observed coherences match exciton difference frequencies and/or known vibrational modes of the photosystem II reaction center. These observations raise questions about the possible role of electronic and/or vibrational coherence in the fundamental charge separation process in oxygenic photosynthesis.

Franklin D. Fuller; Jie Pan; S. Seckin Senlik; Daniel E. Wilcox; Jennifer P. Ogilvie

2013-10-03T23:59:59.000Z

390

Observational Constraints of New Variable Modified Chaplygin Gas Model  

E-Print Network (OSTI)

Assuming the flat FRW universe in Einstein's gravity filled with New Variable Modified Chaplygin gas (NVMCG) dark energy and dark matter having negligible pressure. In this research work we analyze the viability on the basis of recent observation. Hubble parameter $H$ is expressed in terms of the observable parameters $H_0$, $\\Omega_m^0$ and the model parameters $A_0$, $B_0$, $C_0$, $m$, $n$, $\\alpha$ and the red shift parameter $z$. Here we find a best fitted parameter range of $A_0$, $B_0$ keeping $0\\leq \\alpha \\leq 1$ and using Stern data set (12 points) by minimizing the $\\chi^2$ test at 66%, 90% and 99% confidence levels. Next we do the joint analysis with BAO and CMB observations. Again evaluating the distance modulus $\\mu(z)$ vs redshift ($z$) curve obtained in the model NVMCG with dark matter with the best fitted value of the parameters and comparing with that derived from the union2 compilation data.

Jhumpa Bhadra; Ujjal Debnath

2012-11-09T23:59:59.000Z

391

Near-Optimal Bayesian Active Learning with Noisy Observations  

E-Print Network (OSTI)

We tackle the fundamental problem of Bayesian active learning with noise, where we need to adaptively select from a number of expensive tests in order to identify an unknown hypothesis sampled from a known prior distribution. In the case of noise-free observations, a greedy algorithm called generalized binary search (GBS) is known to perform near-optimally. We show that if the observations are noisy, perhaps surprisingly, GBS can perform very poorly. We develop EC2, a novel, greedy active learning algorithm and prove that it is competitive with the optimal policy, thus obtaining the first competitiveness guarantees for Bayesian active learning with noisy observations. Our bounds rely on a recently discovered diminishing returns property called adaptive submodularity, generalizing the classical notion of submodular set functions to adaptive policies. Our results hold even if the tests have non-uniform cost and their noise is correlated. We also propose EffECXtive, a particularly fast approximation of EC2, and ...

Golovin, Daniel; Ray, Debajyoti

2010-01-01T23:59:59.000Z

392

Observation of Coherence in the Photosystem II Reaction Center  

E-Print Network (OSTI)

Photosynthesis powers life on our planet. The basic photosynthetic architecture comprises antenna complexes to harvest solar energy and reaction centers to convert the energy into a stable charge separated state. In oxygenic photosynthesis, the initial charge separation event occurs in the photosystem II reaction center; the only known natural enzyme that uses solar energy to split water. Energy transfer and charge separation in photosynthesis are rapid and have high quantum efficiencies. Recently, nonlinear spectroscopic experiments have suggested that electronic coherence may play a role in energy transfer efficiency in antenna complexes. Here we report the observation of coherence in the photosystem II reaction center by two dimensional electronic spectroscopy. The frequencies of the observed coherences match exciton difference frequencies and/or known vibrational modes of the photosystem II reaction center. These observations raise questions about the possible role of electronic and/or vibrational coheren...

Fuller, Franklin D; Senlik, S Seckin; Wilcox, Daniel E; Ogilvie, Jennifer P

2013-01-01T23:59:59.000Z

393

Observational Constraints on Microwave Anisotropy from Point Sources  

E-Print Network (OSTI)

Applying basic physical principles to recent observational results, we derive upper and lower limits on microwave anisotropy from point sources over the range of frequencies 10-1000 GHz. We examine the level of noise in the observations as a possible indication of source confusion at subarcminute scales. We also derive an upper limit on microwave anisotropy caused by the sources responsible for the Far-Infrared Background radiation detected in FIRAS data. Our upper limit on point source confusion of DeltaT/T=10^{-5} for a 10' beam at 100 GHz would cause severe foreground contamination for CMB anisotropy observations, although the actual contamination level is probably much lower. This upper limit constrains the long-feared possibility of an undetected population of sources with emission peaking near 100 GHz. Source detections closer to 100 GHz are needed to improve our knowledge of galaxy evolution at high redshift and to predict the level of point source confusion.

Eric Gawiser; Andrew Jaffe; Joseph Silk

1998-11-10T23:59:59.000Z

394

FERMI LARGE AREA TELESCOPE OBSERVATIONS OF GRB 110625A  

SciTech Connect

Gamma-ray bursts (GRBs) that emit photons at GeV energies form a small but significant population of GRBs. However, the number of GRBs whose GeV-emitting period is simultaneously observed in X-rays remains small. We report {gamma}-ray observations of GRB 110625A using Fermi's Large Area Telescope in the energy range 100 MeV-20 GeV. Gamma-ray emission at these energies was clearly detected using data taken between 180 s and 580 s after the burst, an epoch after the prompt emission phase. The GeV light curve differs from a simple power-law decay, and probably consists of two emission periods. Simultaneous Swift X-Ray Telescope observations did not show flaring behaviors as in the case of GRB 100728A. We discuss the possibility that the GeV emission is the synchrotron self-Compton radiation of underlying ultraviolet flares.

Tam, P. H. T.; Kong, A. K. H. [Institute of Astronomy and Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan (China); Fan Yizhong, E-mail: phtam@phys.nthu.edu.tw [Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008 (China)

2012-08-01T23:59:59.000Z

395

Fermi GBM Observations of Terrestrial Gamma-ray Flashes  

Science Conference Proceedings (OSTI)

Terrestrial Gamma-ray Flashes are short pulses of energetic radiation associated with thunderstorms and lightning. While the Gamma-ray Burst Monitor (GBM) on Fermi was designed to observe gamma-ray bursts, its large BGO detectors are excellent for observing TGFs. Using GBM, TGF pulses are seen to either be symmetrical or have faster rise time than fall times. Some TGFs are resolved into double, partially overlapping pulses. Using ground-based radio observations of lightning from the World Wide Lightning Location Network (WWLLN), TGFs and their associated lightning are found to be simultaneous to {approx_equal}40 {mu} s. The lightning locations are typically within 300 km of the sub-spacecraft point.

Briggs, Michael S. [CSPAR, NSSTC, 320 Sparkman Drive, Huntsville, AL 35805 (United States)

2011-09-21T23:59:59.000Z

396

Filtering with Marked Point Process Observations via Poisson Chaos Expansion  

SciTech Connect

We study a general filtering problem with marked point process observations. The motivation comes from modeling financial ultra-high frequency data. First, we rigorously derive the unnormalized filtering equation with marked point process observations under mild assumptions, especially relaxing the bounded condition of stochastic intensity. Then, we derive the Poisson chaos expansion for the unnormalized filter. Based on the chaos expansion, we establish the uniqueness of solutions of the unnormalized filtering equation. Moreover, we derive the Poisson chaos expansion for the unnormalized filter density under additional conditions. To explore the computational advantage, we further construct a new consistent recursive numerical scheme based on the truncation of the chaos density expansion for a simple case. The new algorithm divides the computations into those containing solely system coefficients and those including the observations, and assign the former off-line.

Sun Wei, E-mail: wsun@mathstat.concordia.ca [Concordia University, Department of Mathematics and Statistics (Canada); Zeng Yong, E-mail: zengy@umkc.edu [University of Missouri at Kansas City, Department of Mathematics and Statistics (United States); Zhang Shu, E-mail: zhangshuisme@hotmail.com [Concordia University, Department of Mathematics and Statistics (Canada)

2013-06-15T23:59:59.000Z

397

Bounding the mass of the graviton using binary pulsar observations  

E-Print Network (OSTI)

The close agreement between the predictions of dynamical general relativity for the radiated power of a compact binary system and the observed orbital decay of the binary pulsars PSR B1913+16 and PSR B1534+12 allows us to bound the graviton mass to be less than 7.6 x 10^{-20} eV with 90% confidence. This bound is the first to be obtained from dynamic, as opposed to static-field, relativity. The resulting limit on the graviton mass is within two orders of magnitude of that from solar system measurements, and can be expected to improve with further observations.

Lee Samuel Finn; Patrick J. Sutton

2001-09-13T23:59:59.000Z

398

Observational Tests Of Intermediate Mass Star Yields Using Planetary Nebulae  

E-Print Network (OSTI)

This paper summarizes a project designed to study abundances in a sample of planetary nebulae representing a broad range in progenitor mass and metallicity. We collect abundances of C, N, and O determined for the entire sample and compare them with theoretical predictions of planetary nebula abundances from a grid of intermediate-mass star models. We find very good agreement between observations and theory, lending strong support to our current understanding of nucleosynthesis in stars with progenitor masses below 8 solar masses. This agreement between observation and theory also supports the validity of published stellar yields of C and N in the study of the abundance evolution of these two elements.

K. B. Kwitter; R. B. C. Henry

2001-01-04T23:59:59.000Z

399

Observational Tests Of Intermediate Mass Star Yields Using Planetary Nebulae  

E-Print Network (OSTI)

This paper summarizes a project designed to study abundances in a sample of planetary nebulae representing a broad range in progenitor mass and metallicity. We collect abundances of C, N, and O determined for the entire sample and compare them with theoretical predictions of planetary nebula abundances from a grid of intermediate-mass star models. We find very good agreement between observations and theory, lending strong support to our current understanding of nucleosynthesis in stars with progenitor masses below 8 solar masses. This agreement between observation and theory also supports the validity of published stellar yields of C and N in the study of the abundance evolution of these two elements.

Kwitter, K B

2001-01-01T23:59:59.000Z

400

Observation of inertial energy cascade in interplanetary space plasma  

E-Print Network (OSTI)

We show in this article direct evidence for the presence of an inertial energy cascade, the most characteristic signature of hydromagnetic turbulence (MHD), in the solar wind as observed by the Ulysses spacecraft. After a brief rederivation of the equivalent of Yaglom's law for MHD turbulence, we show that a linear relation is indeed observed for the scaling of mixed third order structure functions involving Els\\"asser variables. This experimental result, confirming the prescription stemming from a theorem for MHD turbulence, firmly establishes the turbulent character of low-frequency velocity and magnetic field fluctuations in the solar wind plasma.

Luca Sorriso-Valvo; Raffaele Marino; Vincenzo Carbone; Fabio Lepreti; Pierluigi Veltri; Alain Noullez; Roberto Bruno; Bruno Bavassano; Ermanno Pietropaolo

2007-02-09T23:59:59.000Z

Note: This page contains sample records for the topic "observations classroom observations" 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

Doppler lidar observations of Russian forest fire plumes over Helsinki  

E-Print Network (OSTI)

Russia led to elevated concentrations of fine particles reducing air quality in southern Finland over a number of weeks. Predominately easterly and south-easterly winds resulted in smoke plumes extending over the Gulf of Finland and affecting eastern and southern Finland during 7–14 August 2006 and 21–23 August 2006. This article describes observations using Doppler lidar of two episodes where smoke plumes from the Russian forest fires were evident over the Helsinki area on 7 and 9 August 2006. The observations were made during a convective field campaign, part of the Helsinki Testbed, an international mesoscale meteorology research project running from

K E Bozier; G N Pearson; C G Collier; Halo Photonics

2005-01-01T23:59:59.000Z

402

Summer Polar Chemistry Observations in the Stratosphere Made by HALOE  

Science Conference Proceedings (OSTI)

Regions of low stratospheric ozone that are anticorrelated with HCl, NO, and NO2 levels have been observed in the Arctic and Antarctic summers of 1992 and 1993 by the Halogen Occultation Experiment on the UARS platform. The low ozone areas are ...

Jae H. Park; James M. Russell III

1994-10-01T23:59:59.000Z

403

Observation and Theory of the Diurnal Continental Thermal Tide  

Science Conference Proceedings (OSTI)

Harmonic analysis of summer Automated Surface Observing System (ASOS) data over North America shows sun-following diurnal temperature and pressure oscillations with amplitudes increasing in the western United States (i.e., 5–8 K and 60–120 hPa, ...

Yanping Li; Ronald B. Smith

2010-09-01T23:59:59.000Z

404

Observations of gas flows inside a protoplanetary gap  

E-Print Network (OSTI)

Gaseous giant planet formation is thought to occur in the first few million years following stellar birth. Models predict that giant planet formation carves a deep gap in the dust component (shallower in the gas). Infrared observations of the disk around the young star HD142527, at ~140pc, found an inner disk ~10AU in radius, surrounded by a particularly large gap, with a disrupted outer disk beyond 140AU, indicative of a perturbing planetary-mass body at ~90 AU. From radio observations, the bulk mass is molecular and lies in the outer disk, whose continuum emission has a horseshoe morphology. The vigorous stellar accretion rate would deplete the inner disk in less than a year, so in order to sustain the observed accretion, matter must flow from the outer-disk into the cavity and cross the gap. In dynamical models, the putative protoplanets channel outer-disk material into gap-crossing bridges that feed stellar accretion through the inner disk. Here we report observations with the Atacama Large Millimetre Arr...

Casassus, Simon; M., Sebastian Perez; Dent, William R F; Fomalont, Ed; Hagelberg, Janis; Hales, Antonio; Jordán, Andrés; Mawet, Dimitri; Ménard, Francois; Wootten, Al; Wilner, David; Hughes, A Meredith; Schreiber, Matthias R; Girard, Julien H; Ercolano, Barbara; Canovas, Hector; Román, Pablo E; Salinas, Vachail

2013-01-01T23:59:59.000Z

405

OBSERVING GRAVITATIONAL LENSING EFFECTS BY Sgr A* WITH GRAVITY  

SciTech Connect

The massive black hole Sgr A* at the Galactic center is surrounded by a cluster of stars orbiting around it. Light from these stars is bent by the gravitational field of the black hole, giving rise to several phenomena: astrometric displacement of the primary image, the creation of a secondary image that may shift the centroid of Sgr A*, and magnification effects on both images. The soon-to-be second-generation Very Large Telescope Interferometer instrument GRAVITY will perform observations in the near-infrared of the Galactic center at unprecedented resolution, opening the possibility of observing such effects. Here we investigate the observability limits for GRAVITY of gravitational lensing effects on the S-stars in the parameter space 1[D{sub LS}, {gamma}, K], where D{sub LS} is the distance between the lens and the source, {gamma} is the alignment angle of the source, and K is the source's apparent magnitude in the K band. The easiest effect to observe in future years is the astrometric displacement of primary images. In particular, the shift of the star S17 from its Keplerian orbit will be detected as soon as GRAVITY becomes operative. For exceptional configurations, it will be possible to detect effects related to the spin of the black hole or post-Newtonian orders in the deflection.

Bozza, V. [Department of Physics 'E.R. Caianiello', University of Salerno, Via Ponte Don Melillo, Fisciano I-84084 (Italy); Mancini, L., E-mail: valboz@physics.unisa.it, E-mail: mancini@mpia-hd.mpg.de [Max Planck Institute for Astronomy, Koenigstuhl 17, D-69117 Heidelberg (Germany)

2012-07-01T23:59:59.000Z

406

A 35-GHz Scanning Doppler Radar for Fog Observations  

Science Conference Proceedings (OSTI)

To observe fog, a 35-GHz scanning Doppler radar was designed, assembled, and tested. The radar, mounted on a flatbed vehicle for portability, transmits peak powers of 100 kW in a pulse of 0.5-µs width and a beamwidth of 0.3°. Thus, a reflectivity ...

Kyosuke Hamazu; Hiroyuki Hashiguchi; Toshio Wakayama; Tomoya Matsuda; Richard J. Doviak; Shoichiro Fukao

2003-07-01T23:59:59.000Z

407

Observations of Tidal Internal Wave Beams at Kauai Channel, Hawaii  

Science Conference Proceedings (OSTI)

To observe the across-ridge structure of internal tides, density and velocity were measured using SeaSoar and a Doppler sonar over the upper 400–600 m of the ocean extending 152 km on each side of the Hawaiian Ridge at Kauai Channel. Eighteen ...

S. T. Cole; D. L. Rudnick; B. A. Hodges; J. P. Martin

2009-02-01T23:59:59.000Z

408

Identification of Wiener systems with binary-valued output observations  

Science Conference Proceedings (OSTI)

This work is concerned with identification of Wiener systems whose outputs are measured by binary-valued sensors. The system consists of a linear FIR (finite impulse response) subsystem of known order, followed by a nonlinear function with a known parametrization ... Keywords: Binary-valued observations, Identification, Joint identifiability, Parameter estimation, Periodic inputs, Sensor thresholds, Wiener systems

Yanlong Zhao; Le Yi Wang; G. George Yin; Ji-Feng Zhang

2007-10-01T23:59:59.000Z

409

Sivers and Boer-Mulders observables from lattice QCD.  

SciTech Connect

We present a first calculation of transverse momentum dependent nucleon observables in dynamical lattice QCD employing non-local operators with staple-shaped, 'process-dependent' Wilson lines. The use of staple-shaped Wilson lines allows us to link lattice simulations to TMD effects determined from experiment, and in particular to access non-universal, naively time-reversal odd TMD observables. We present and discuss results for the generalized Sivers and Boer-Mulders transverse momentum shifts for the SIDIS and DY cases. The effect of staple-shaped Wilson lines on T-even observables is studied for the generalized tensor charge and a generalized transverse shift related to the worm gear function g{sub 1}T. We emphasize the dependence of these observables on the staple extent and the Collins-Soper evolution parameter. Our numerical calculations use an n{sub f} = 2+1 mixed action scheme with domain wall valence fermions on an Asqtad sea and pion masses 369 MeV as well as 518 MeV.

B.U. Musch, Ph. Hagler, M. Engelhardt, J.W. Negele, A. Schafer

2012-05-01T23:59:59.000Z

410

Experimental observables on nuclear liquid gas phase transition  

E-Print Network (OSTI)

Progress on nuclear liquid gas phase transition (LGPT) or critical behavior has been simply reviewed and some signals of LGPT in heavy ion collisions, especially in NIMROD data, are focused. These signals include the power-law charge distribution, the largest fluctuation of the fragment observables, the nuclear Zipf law, caloric curve and critical exponent analysis etc.

Y. G. Ma

2006-10-07T23:59:59.000Z

411

Further Studies of a Lake Breeze Part I: Observational Study  

Science Conference Proceedings (OSTI)

The three-dimensional structure and behavior of a lake-land breeze circulation system induced by Lake Ontario for a selected 24 h period is presented. The structure is determined from observations made during the International Field Year of the ...

Mariano A. Estoque

1981-03-01T23:59:59.000Z

412

$?$ meson exchange effect on nonmesonic hypernuclear weak decay observables  

E-Print Network (OSTI)

We analyze the influence of $\\sigma$ meson exchange on the main nonmesonic hypernuclear weak decay observables: the total rate, $\\Gamma_{NM}$, the neutron-to-proton branching ratio, $\\Gamma_{n/p}$, and the proton asymmetry parameter, $a_\\Lambda$. The $\\sigma$ meson exchange is added to the standard strangeness-changing weak $\\Lambda N\\to NN$ transition potential, which includes the exchange of the complete pseudoscalar and vector mesons octet ($\\pi$, $\\eta$, $K$, $\\rho$, $\\omega$, $K^*$). Using a shell model formalism, the $\\sigma$ meson weak coupling constants are adjusted to reproduce the recent $\\Gamma_{NM}$ and $\\Gamma_{n/p}$ experimental data for $^5_{\\Lambda}He$. Numerical results for the remaining observables of $^5_{\\Lambda}He$ and all the observables of $^{12}_{\\Lambda}C$ decays are presented. They clearly show that the addition of the $\\sigma$ meson, in spite of improving some observables values, is not enough to reproduce simultaneously all the measurements, and the puzzle posed by the experimental data remains unexplained.

C. Barbero; A. Mariano

2005-09-15T23:59:59.000Z

413

Bringing Climate Models into Agreement with Observations of Atmospheric Absorption  

Science Conference Proceedings (OSTI)

A comparison of the output of two data assimilation models with a quasi-global, multiyear set of monthly mean observations shows that the models underestimate the amount of solar energy absorbed in the atmosphere by 15–30 W m?2, out of a total of ...

Albert Arking

1999-06-01T23:59:59.000Z

414

Observation of Atmospheric Fronts Using Raman Lidar Moisture Measurements  

Science Conference Proceedings (OSTI)

This paper presents the results of a field program using a ground-based Raman lidar system to observe changes in moisture profiles as a cold and a warm front passed over the NASA/Goddard Space Flight Center in Greenbelt, Maryland. The lidar ...

S. H. Melfi; D. Whiteman; R. Ferrare

1989-09-01T23:59:59.000Z

415

COMPTEL Observation of the Flaring Quasar PKS0528+134  

E-Print Network (OSTI)

With a direct demodulation method, we have reanalyzed the data from COMPTEL/CGRO observation of PKS0528+134 during the 1993 March flare in gamma-rays. Our results show that during the flare gamma-rays were detected at a level approximately 2.4-3.8 times greater than the observed intensity in two earlier COMPTEL observations VP 0 and VP 1 in the energy range 3 MeV to 30 MeV. The 3-30 MeV time variability of the flux follows well the trend as observed by EGRET/CGRO at higher energies. No convincing excess can be found around the position of PKS0528+134 in the energy range 0.75 MeV to 3 MeV, which indicates a spectral break around 3 MeV. The detections and non-detections in the four standard COMPTEL energy bands are consistent with the earlier reports given by Collmar et al., while the feature that gamma-rays of the quasar still kept on flaring at energies down to 3 MeV is clearly found.

S. Zhang; T. P. Li; M. Wu

1998-10-08T23:59:59.000Z

416

Observation of Ice Crystal Formation in Lower Arctic Atmosphere  

Science Conference Proceedings (OSTI)

Clear sky ice crystals or diamond dust displays are observed in polar regions, both remote and populated; when the temperature falls to ?20°C and where abundant sources of water vapor are present. In remote areas of the Arctic, these ice crystals ...

Takeshi Ohtake; Kolf Jayaweera; Ken-Ichi Sakurai

1982-12-01T23:59:59.000Z

417

Air–Water Momentum Flux Observations over Shoaling waves  

Science Conference Proceedings (OSTI)

This paper drab, with simultaneous momentum flux observations from four towers placed at different depths along a shore-normal line at the west end of Lake Ontario, Canada. The towers were at nominal depths of 12, 8, 4, and 2 m, in order to study ...

F. Anctil; M. A. Donelan

1996-07-01T23:59:59.000Z

418

Observed Microphysical Structure of Midlevel, Mixed-Phase Clouds  

Science Conference Proceedings (OSTI)

This paper analyzes airborne measurements of six midlevel clouds observed over the Great Plains of the United States in late 1999 and early 2000 during the fifth of the Complex Layered-Cloud Experiments (CLEX-5). Data show that these innocuous-...

Robert P. Fleishauer; Vincent E. Larson; Thomas H. Vonder Haar

2002-06-01T23:59:59.000Z

419

Geomagnetic Disturbance (GMD) News and Observer: Issue 4  

Science Conference Proceedings (OSTI)

This is the fourth issue of GMD News and Observer. This newsletter provides progress reports and insights for the industry on the geomagnetic disturbance (GMD) area. This issue covers efforts accomplished in 2012 and summarizes plans for 2013. Previous issues can be downloaded from epri.com (1025857, 1025858, and 1025859).

2013-04-17T23:59:59.000Z

420

Short-period global atmospheric waves revealed by nightglow observations  

Science Conference Proceedings (OSTI)

The night-time emissions of OH (6-2) and the O2 Atmospheric System (0-1) have been observed at Maimaga (63.1° N, 129.6° E) during the winters of 2007-2008 and 2008-2009 and revealed steady-frequency atmospheric oscillations near the mesopause ...

Natalia Karpova; Gustav Shved; Svetlana Ermolenko; Petr Ammosov; Galina Gavrilyeva; Elena Savenkova

2011-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "observations classroom observations" 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

Ice Cube Observed PeV Neutrinos from AGN Cores  

E-Print Network (OSTI)

I show that the high energy neutrino flux predicted to arise from AGN cores can explain the PeV neutrinos detected by Ice Cube without conflicting with the constraints from the observed extragalactic cosmic ray and gamma-ray backgrounds.

Floyd W. Stecker

2013-05-31T23:59:59.000Z

422

Arctic Sea Ice Decline: Observations, Projections, Mechanisms, and Implications  

E-Print Network (OSTI)

or phase space. In this work we con- sider the trajectory of sea ice in the ice thickness phase space. We175 Arctic Sea Ice Decline: Observations, Projections, Mechanisms, and Implications Geophysical Is the Trajectory of Arctic Sea Ice? Harry L. Stern and Ronald W. Lindsay Polar Science Center, Applied Physics

Lindsay, Ron

423

Observational Evidence from Supernovae for a Contracting Universe  

E-Print Network (OSTI)

New precision in measuring extragalactic distances using supernovae has confirmed with high probability an accelerating increase in redshift with distance. This has been interpreted as implying the existence of dark energy in an expanding and accelerating, flat universe. A more logical explanation of these observations follows directly from an observation made by Erwin Schrodinger in 1939 that in a closed Friedmann universe every quantum wave function changes with spacetime geometry. Double the size of the universe and both the wavelengths of photons and the sizes of atoms double. When the evolution of atoms and photons are combined, the meaning of Hubble redshift is reversed. Redshift is characteristic of contracting universes. The magnitude-redshift curve for a contracting universe has exactly the accelerating form recently observed and is in excellent quantitative agreement with the data of Riess et al. 1998, Knop et al. 2003, and others. An observed maximum redshift of 1.3 gives a minimum age estimate for the universe of 114 billion years. The time until collapse is estimated to be 15 billion years or less.

William Q. Sumner

2004-02-28T23:59:59.000Z

424

Observations and Scale Analysis of Coastal Wind Jets  

Science Conference Proceedings (OSTI)

Blocking of onshore flow by coastal mountains was observed south of Vancouver Island, British Columbia, by the NOAA P-3 aircraft on 1 December 1993. Winds increased from 10 m s?1 offshore to 15 m s?1 nearshore and became more parallel to shore in ...

James E. Overland; Nicholas A. Bond

1995-10-01T23:59:59.000Z

425

OAC report September 2011 1 Observer Advisory Committee Meeting Report  

E-Print Network (OSTI)

(NMFS AKR), Brandee Gerke (NMFS AKR), Tom Meyer (NOAA GC), Heather Weikart (NMFS AKR), Nathan Lagerwey, Inc.), Yakov Reutov (GOA hook- and-line fisherman), Lori Swanson (BSAI Am. 80 sector), Elizabeth be paid for those days in port; however, other larger communities (e.g., Kodiak) have 17 or 18 observers

426

Validation of General Circulation Model Radiative Fluxes Using Surface Observations  

Science Conference Proceedings (OSTI)

The surface radiative fluxes of the ECHAM3 General Circulation Model (GCM) with T2 1, T42, and T 106 resolutions have been validated using observations from the Global Energy Balance Archive (GEBA, World Climate Program-Water Project A7). GEBA ...

Martin Wild; Atsumu Ohmura; Hans Gilgen; Erich Roeckner

1995-05-01T23:59:59.000Z

427

General Characteristics of Squall Lines Observed in TAMEX  

Science Conference Proceedings (OSTI)

Six cases of prefrontal squall lines were observed over the Taiwan Strait and western Taiwan during the 1987 Taiwan Area Mesoscale Experiment (TAMEX). The mean propagation speed was 10 m s?1, and the mean life span was 11.4 h for the six squall ...

George T. J. Chen; H. C. Chou

1993-03-01T23:59:59.000Z

428

OBSERVATIONAL SCAN-INDUCED ARTIFICIAL COSMIC MICROWAVE BACKGROUND ANISOTROPY  

SciTech Connect

Reliably detecting the cosmic microwave background (CMB) anisotropy is of great importance in understanding the birth and evolution of the universe. One of the difficulties in CMB experiments is the domination of measured CMB anisotropy maps by the Doppler dipole moment from the motion of the antenna relative to the CMB. For each measured temperature, the expected dipole component has to be calculated separately and then subtracted from the data. A small error in dipole direction, antenna pointing direction, sidelobe pickup contamination, and/or timing synchronism can introduce a significant deviation in the dipole-cleaned CMB temperature. After a full-sky observational scan, the accumulated deviations will be structured with a pattern closely correlated with the observation pattern with artificial anisotropies, including artificial quadrupole, octupole, etc., on large scales in the final CMB map. Such scan-induced anisotropies on large scales can be predicted by the true dipole moment and observational scan scheme. Indeed, the expected scan-induced quadrupole pattern of the Wilkinson Microwave Anisotropy Probe (WMAP) mission is perfectly in agreement with the published WMAP quadrupole. With the scan strategy of the Planck mission, we predict that scan-induced anisotropies will also produce an artificially aligned quadrupole. The scan-induced anisotropy is a common problem for all sweep missions and, like the foreground emissions, has to be removed from observed maps. Without doing so, CMB maps from COBE, WMAP, and Planck are not reliable for studying the CMB anisotropy.

Liu Hao; Li Tipei, E-mail: liuhao@ihep.ac.cn, E-mail: litp@tsinghua.edu.cn [Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing (China)

2011-05-10T23:59:59.000Z

429

An Observationally Based Estimate of the Climate Sensitivity  

Science Conference Proceedings (OSTI)

A probability distribution for values of the effective climate sensitivity, with a lower bound of 1.6 K (5th percentile), is obtained on the basis of the increase in ocean heat content in recent decades from analyses of observed interior-ocean ...

J. M. Gregory; R. J. Stouffer; S. C. B. Raper; P. A. Stott; N. A. Rayner

2002-11-01T23:59:59.000Z

430

FIELD OBSERVATIONS OF GAS-CONDENSATE WELL TESTING  

E-Print Network (OSTI)

, a commercial simulator was used to perform phase- equilibrium and property calculations based on the PengFIELD OBSERVATIONS OF GAS- CONDENSATE WELL TESTING A REPORT SUBMITTED TO THE DEPARTMENT OF ENERGY-point pressure is impacted severely due to condensate banking around the wellbore. Condensate banking also

431

Solar Wind Forecast by Using Interplanetary Scintillation Observations  

Science Conference Proceedings (OSTI)

Interplanetary scintillation (IPS) allows us to determine solar wind velocity and density structures over a relatively short time by employing computer assisted tomography. This method can be applied to forecast solar wind changes for a few days prior to its reaching Earth. We have been attempting solar wind forecasting by using IPS data observed at Solar?Terrestrial Environment Laboratory (STELab)

Ken’ichi Fujiki; Hiroaki Ito; Munetoshi Tokumaru

2010-01-01T23:59:59.000Z

432

Observations of Wind-Generated Waves in Antarctic Fast Ice  

Science Conference Proceedings (OSTI)

Observations of naturally induced propagating waves in the fast ice cover of McMurdo Sound, Antarctica, were made during the austral winter of 1986 with a rosette of three wire strainmeters. The data, collected over a seven-month period and ...

G. B. Crocker; P. Wadhams

1988-09-01T23:59:59.000Z

433

Global observations of desert dust and biomass burning aerosols  

E-Print Network (OSTI)

Global observations of desert dust and biomass burning aerosols Martin de Graaf KNMI #12; Outline · Absorbing Aerosol Index - Theory · Absorbing Aerosol Index - Reality · Biomass burning.6 Biomass burning over Angola, 09 Sep. 2004 Absorbing Aerosol Index PMD image #12;biomass burning ocean

Graaf, Martin de

434

Probing black holes at low redshift using LISA EMRI observations  

E-Print Network (OSTI)

One of the most exciting potential sources of gravitational waves for the Laser Interferometer Space Antenna (LISA) are the inspirals of approximately solar mass compact objects into massive black holes in the centres of galaxies - extreme mass ratio inspirals (EMRIs). LISA should observe between a few tens and a few hundred EMRIs over the mission lifetime, mostly at low redshifts (z measurement of the parameters of the host system to unprecendented precision. LISA EMRI observations will thus offer a new and unique way to probe black holes at low redshift. In this article we provide a description of the population of EMRI events that LISA is likely to observe, and describe how the numbers of events vary with changes in the underlying assumptions about the black hole population. We also provide fitting functions that characterise LISA's ability to detect EMRIs and which will allow LISA event rates to be computed for arbitrary population models. We finish with a discussion of an ongoing programme that will use these results to assess what constraints LISA observations could place on galaxy evolution models.

Jonathan R Gair

2008-11-02T23:59:59.000Z

435

The geomagnetic secularvariation timescale in observations and numerical dynamo models  

E-Print Network (OSTI)

The geomagnetic secularvariation timescale in observations and numerical dynamo models Florian March 2011; published 5 May 2011. [1] The knowledge of the spatial power spectra of the main geomagnetic for recent satellite field models. In the broader context of geomagnetic data assimilation, tSV could provide

Aubert, Julien

436

X-Band Polarimetric Weather Radar Observations of a Hailstorm  

Science Conference Proceedings (OSTI)

This paper presents an analysis of a hail event that occurred 27 May 2012 over Brignoles, located in southeastern France. The event was observed by an X-band polarimetric radar located in Mont Maurel, 75 km northeast of the hailstorm. Lightning ...

Jordi Figueras i Ventura; Françoise Honoré; Pierre Tabary

2013-09-01T23:59:59.000Z

437

Are we observing Lorentz violation in gamma ray bursts?  

E-Print Network (OSTI)

From recent observations of gamma-ray bursts (GRBs), it appears that spectral time lags between higher-energy gamma rays photons and lower-energy photons vary with energy difference and time (distance) traveled. These lags appear to be smaller for the most luminous (close) bursts but larger for the fainter (farther away) bursts. From this observation, it has been suggested that it might be possible to determine the distance (L) these bursts have traveled from these time lags alone, without performing any red-shift measurements. These observed spreads (dispersion) of high-energy electromagnetic pulses of different energies with time contradict the special theory of relativity (STR). However, extended theories (ET) of the STR have been developed that contain a dispersive term, predicting the above observations. An example of such an ET is presented, allowing us to derive a relationship between time lags of gamma rays of different energies and distance L traveled from their origin. In addition, this theory predicts the origin of X-ray flashes.

Theodore G. Pavlopoulos

2005-08-12T23:59:59.000Z

438

Autonomous observations of the ocean biological carbon pump  

Science Conference Proceedings (OSTI)

Prediction of the substantial biologically mediated carbon flows in a rapidly changing and acidifying ocean requires model simulations informed by observations of key carbon cycle processes on the appropriate space and time scales. From 2000 to 2004, the National Oceanographic Partnership Program (NOPP) supported the development of the first low-cost fully-autonomous ocean profiling Carbon Explorers that demonstrated that year-round real-time observations of particulate organic carbon (POC) concentration and sedimentation could be achieved in the world's ocean. NOPP also initiated the development of a sensor for particulate inorganic carbon (PIC) suitable for operational deployment across all oceanographic platforms. As a result, PIC profile characterization that once required shipboard sample collection and shipboard or shore based laboratory analysis, is now possible to full ocean depth in real time using a 0.2W sensor operating at 24 Hz. NOPP developments further spawned US DOE support to develop the Carbon Flux Explorer, a free-vehicle capable of following hourly variations of particulate inorganic and organic carbon sedimentation from near surface to kilometer depths for seasons to years and capable of relaying contemporaneous observations via satellite. We have demonstrated the feasibility of real time - low cost carbon observations which are of fundamental value to carbon prediction and when further developed, will lead to a fully enhanced global carbon observatory capable of real time assessment of the ocean carbon sink, a needed constraint for assessment of carbon management policies on a global scale.

Bishop, James K.B.

2009-03-01T23:59:59.000Z

439

Observations of Vortex Rossby Waves Associated with a Mesoscale Cyclone  

Science Conference Proceedings (OSTI)

Short-wavelength (L 100 km) Rossby waves with an eastward zonal phase velocity were observed by high-frequency radio Doppler current meters and moored ADCPs west of Oahu, Hawaii, during spring 2003. They had Rossby numbers Ro = |?/f| = O(1), ...

Cédric P. Chavanne; Pierre Flament; Douglas S. Luther; Klaus-Werner Gurgel

2010-10-01T23:59:59.000Z

440

Current and Density Observations across the Wake of Hurricane Gay  

Science Conference Proceedings (OSTI)

CTD and acoustic Doppler current profiler data are analyzed for the response of the upper ocean to rapidly moving Hurricane Gay. Currents were observed within about two days of the hurricane passage and were dominated by a blue-shifted inertial ...

John A. Church; T. M. Joyce; James F. Price

1989-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "observations classroom observations" 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

Observations of Seasonal Variation in the Ekman Layer  

Science Conference Proceedings (OSTI)

The seasonal variation in the Ekman layer is examined using observations from the Long-Term Upper Ocean Study (LOTUS), including surface meteorology, current, and temperature. The near-surface current is found to be coherent with the wind at low ...

Rebecca R. Schudlich; James F. Price

1998-06-01T23:59:59.000Z

442

Direct observation of oxygen superstructures in manganites S. Grenier,1  

E-Print Network (OSTI)

Direct observation of oxygen superstructures in manganites S. Grenier,1 K. J. Thomas,2 J. P. Hill,2). [9] D. Volja, et al., cond-mat:0704.1834v1 (2007). [10] S. Grenier, et al., Phys. Rev. B 75, 085101 (Materlik, Sparks and Fisher, 1994). [14] H. L. Ju, et al., Phys. Rev. Lett. 79, 3230 (1997). [15] J. Garc

Paris-Sud XI, Université de

443

Observation of Beam ION Instability in Spear3  

SciTech Connect

Weak vertical coupled bunch instability with oscillation amplitude at {mu}m level has been observed in SPEAR3. The instability becomes stronger when there is a vacuum pressure rise by partially turning off vacuum pumps and it becomes weaker when the vertical beam emittance is increased by turning off the skew quadrupole magnets. These confirmed that the instability was driven by ions in the vacuum. The threshold of the beam ion instability when running with a single bunch train is just under 200 mA. This paper presents the comprehensive observations of the beam ion instability in SPEAR3. The effects of vacuum pressure, beam current, beam filling pattern, chromaticity, beam emittance and bunch-by-bunch feedback are investigated in great detail. In an electron accelerator, ions generated from the residual gas molecules can be trapped by the beam. Then these trapped ions interact resonantly with the beam and cause beam instability and emittance blow-up. Most existing light sources use a long single bunch train filling pattern, followed by a long gap to avoid multi-turn ion trapping. However, such a gap does not preclude ions from accumulating during one passage of the single bunch train beam, and those ions can still cause a Fast Ion Instability (FII) as predicted by Raubenheimer and Zimmermann. FII has been observed in ALS, and PLS by artificially increasing the vacuum pressure by injecting helium gas into the vacuum chamber or by turning off the ion pumps in order to observe the beam ion instability. In some existing rings, for instance B factory, the beam ion instability was observed at the beginning of the machine operation after a long period of shutdown and then it automatically disappeared when the vacuum was better. However, when the beam emittance becomes smaller, the FII can occur at nominal conditions as observed in PLS, SOLEIL and SSRF. This paper reports the observations of beam ion instabilities in SPEAR3 under different condition during a period of one year, which includes single bunch train instability (FII) and multi-bunch train instability. Note that the instability may be not the same even with the same beam due to the change of the vacuum with time. SPEAR3 has a circumference of 234 m with a harmonic number of 372. SPEAR3 runs with six bunch train filling pattern in order to suppress the possible beam ion instability. Table 1 lists the main parameters of SPEAR3. The vacuum of SPEAR3 ranges from 0.1 to 0.5 nTorr, which varies from section to section.

Teytelman, D.; /Dimtel, Redwood City; Cai, Y.; Corbett, W.J.; Raubenheimer, T.O.; Safranek, J.A.; Schmerge, J.F.; Sebek, J.J.; Wang, L.; /SLAC

2011-12-14T23:59:59.000Z

444

OBSERVATION OF ULTRAFINE CHANNELS OF SOLAR CORONA HEATING  

SciTech Connect

We report the first direct observations of dynamical events originating in the Sun's photosphere and subsequently lighting up the corona. Continuous small-scale, impulsive events have been tracked from their origin in the photosphere on through to their brightening of the local corona. We achieve this by combining high-resolution ground-based data from the 1.6 m aperture New Solar Telescope (NST) at Big Bear Solar Observatory (BBSO), and satellite data from the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory (SDO). The NST imaging observations in helium I 10830 A reveal unexpected complexes of ultrafine, hot magnetic loops seen to be reaching from the photosphere to the base of the corona. Most of these ultrafine loops are characterized by an apparently constant, but surprisingly narrow diameter of about 100 km all along each loop, and the loops originate on the solar surface from intense, compact magnetic field elements. The NST observations detect the signature of upward injections of hot plasma that excite the ultrafine loops from the photosphere to the base of the corona. The ejecta have their individual footpoints in the intergranular lanes between the Sun's ubiquitous, convectively driven granules. In many cases, AIA/SDO detects cospatial and cotemporal brightenings in the overlying, million degree coronal loops in conjunction with the upward injections along the ultrafine loops. Segments of some of the more intense upward injections are seen as rapid blueshifted events in simultaneous H{alpha} blue wing images observed at BBSO. In sum, the observations unambiguously show impulsive coronal heating events from upward energy flows originating from intergranular lanes on the solar surface accompanied by cospatial mass flows.

Ji, Haisheng [Key Laboratory for Dark Matter and Space Science, Purple Mountain Observatory, CAS, Nanjing 210008 (China); Cao, Wenda; Goode, Philip R. [Big Bear Solar Observatory, 40386 North Shore Lane, Big Bear City, CA 92314 (United States)

2012-05-01T23:59:59.000Z

445

Characteristics of fine particle growth events observed above a forested  

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

Characteristics of fine particle growth events observed above a forested Characteristics of fine particle growth events observed above a forested ecosystem in the Sierra Nevada Mountains of California Title Characteristics of fine particle growth events observed above a forested ecosystem in the Sierra Nevada Mountains of California Publication Type Journal Article Year of Publication 2006 Authors Lunden, Melissa M., Douglas R. Black, Megan McKay, Kenneth L. Revzan, Allen H. Goldstein, and Nancy J. Brown Journal Aerosol Science and Technology Volume 40 Start Page 373 Issue 5 Pagination 373-388 Date Published 02/2006 ISSN 0278-6826 (Print), 1521-7388 (Online) Abstract Atmospheric aerosols from natural and anthropogenic processes have both primary and secondary origins, and can influence human health, visibility, and climate. One key process affecting atmospheric concentrations of aerosols is the formation of new particles and their subsequent growth to larger particle sizes. A field study was conducted at the Blodgett Forest Research Station in the Sierra Nevada Mountains of California from May through September of 2002 to examine the effect of biogenic volatile organic compounds on aerosol formation and processing. The study included in-situ measurements of concentration and biosphere-atmosphere flux of VOCs, ozone, aerosol size distribution, aerosol physical and optical properties, and meteorological variables. Fine particle growth events were observed on approximately 30 percent of the 107 days with complete size distribution data. Average particle growth rates measured during these events were 3.8 ± 1.9 nm hr-1. Correlations between aerosol properties, trace gas concentrations, and meteorological measurements were analyzed to determine conditions conducive to fine particle growth events. Growth events were typically observed on days with a lesser degree of anthropogenic influence, as indicated by lower concentrations of black carbon, carbon monoxide, and total aerosol volume. Days with growth events also had lower temperatures, increased wind speeds, and larger momentum flux. Measurements of ozone concentrations and ozone flux indicate that gas phase oxidation of biogenic volatile organic compounds occur in the canopy, strongly suggesting that a significant portion of the material responsible for the observed particle growth are oxidation products of naturally emitted very reactive organic compounds.

446

Climatological Data for Clouds Over the Globe from Surface Observations  

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

for Clouds Over the Globe from Surface Observations for Clouds Over the Globe from Surface Observations (1988) (NDP-026) DOI: 10.3334/CDIAC/cli.ndp026 data Data Investigators C. J. Hahn, S. G. Warren, J. London, R. L. Jenne, and R. M. Chervin With some data from as early as 1930, global long-term monthly and/or seasonal total cloud cover, cloud type amounts and frequencies of occurrence, low cloud base heights, harmonic analyses of annual and diurnal cycles, interannual variations and trends, and cloud type co-occurrences have been compiled and presented in two atlases (Warren et al. 1988, 1990). These data were derived from land and ship synoptic weather reports from the "SPOT" archive of the Fleet Numerical Oceanography Center (FNOC) and from Release 1 of the Comprehensive Ocean-Atmosphere Data Set (COADS) for

447

Observing Newtrinos: 1663 Science and Technology Magazine | Los National  

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

Observing Newtrinos Observing Newtrinos RECENT NEUTRINO EXPERIMENTS PROVIDE A RARE OPPORTUNITY TO GLIMPSE NEW PARTICLE PHYSICS The field of particle physics spent much of the last century converging on the "standard model" that describes subatomic particles and the forces by which they interact. Ambitious research that began in the early 1900s with hot-air balloon experiments aimed at catching cosmic rays, and followed later in the century with accelerator-based experiments, led to the extraordinary success of the standard model. Nonetheless, the excitement in particle physics often lies not with the vast body of solidly established textbook knowledge, but rather on the fringe, where researchers seek to identify new physics beyond the standard model. Some even hope to find a

448

Computer-Related Ergonomic Safety Talking Points and Observation  

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

Related Ergonomic Safety Related Ergonomic Safety Talking Points and Observation Criteria Supporting Managers and Supervisors in Meetings with Employees March 14, 2007 Background to Discussions * Scope of the Problem: - ~70% of recordable injuries this FY are from ergonomic causes - ~70% of ergonomic injuries involve computer work (remainder mainly involve laboratory and shop work) - Most significant cause of computer related ergo injuries is workload hazard control (help = work with manager) - Single most significant contributing factor is not requesting help when ergonomic issues surface (help = request ergonomic evaluation) Suggested Employee Discussion Topics - Computer Ergo (p1) * Meet with employees in their workspace so you can observe the ergonomic issues in their work. * Begin by telling the employee you are there to see

449

Observation of a Macroscopically Quantum-Entangled Insulator  

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

Observation of a Macroscopically Quantum-Entangled Insulator Print Observation of a Macroscopically Quantum-Entangled Insulator Print It has recently been proposed that insulators with large band gaps and strong spin-orbit coupling can host a new phase of quantum matter called a topological insulator that is characterized by entangled wavefunctions. The proposal has now been realized by an international collaboration led by researchers from Princeton University who studied the electronic structure of insulating alloys of bismuth and antimony by means of angle-resolved photoemission spectroscopy (ARPES) and spin-resolved ARPES. Their results constitute the first direct experimental evidence of a topological insulator in nature that is fully quantum entangled. In the future, a detailed study of topological order and quantum entanglement using their method can potentially pave the way for fault-tolerant (topological) quantum computing.

450

Observation of a Macroscopically Quantum-Entangled Insulator  

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

Observation of a Macroscopically Quantum-Entangled Insulator Print Observation of a Macroscopically Quantum-Entangled Insulator Print It has recently been proposed that insulators with large band gaps and strong spin-orbit coupling can host a new phase of quantum matter called a topological insulator that is characterized by entangled wavefunctions. The proposal has now been realized by an international collaboration led by researchers from Princeton University who studied the electronic structure of insulating alloys of bismuth and antimony by means of angle-resolved photoemission spectroscopy (ARPES) and spin-resolved ARPES. Their results constitute the first direct experimental evidence of a topological insulator in nature that is fully quantum entangled. In the future, a detailed study of topological order and quantum entanglement using their method can potentially pave the way for fault-tolerant (topological) quantum computing.

451

Observations of M87 and Hydra A at 90 GHz  

E-Print Network (OSTI)

This paper presents new observations of the AGNs M87 and Hydra A at 90 GHz made with the MUSTANG bolometer array on the Green Bank Telescope at 8.5" resolution. A spectral analysis is performed combining this new data and archival VLA data on these objects at longer wavelengths. This analysis can detect variations in spectral index and curvature expected from energy losses in the radiating particles. M87 shows only weak evidence for steepening of the spectrum along the jet suggesting either re-acceleration of the relativistic particles in the jet or insufficient losses to affect the spectrum at 90 GHz. The jets in Hydra A show strong steepening as they move from the nucleus suggesting unbalanced losses of the higher energy relativistic particles. The difference between these two sources may be accounted for by the different lengths over which the jets are observable, 2 kpc for M87 and 45 kpc for Hydra A.

Cotton, W D; Dicker, S; Korngut, P; Devlin, M J; Aguirre, J; Benford, D; Moseley, H; Staguhn, J; Irwin, K; Ade, P

2009-01-01T23:59:59.000Z

452

High Spatial Resolution Observations of Loops in the Solar Corona  

E-Print Network (OSTI)

Understanding how the solar corona is structured is of fundamental importance to determining how the Sun's upper atmosphere is heated to high temperatures. Recent spectroscopic studies have suggested that an instrument with a spatial resolution of 200km or better is necessary to resolve coronal loops. The High Resolution Coronal Imager (Hi-C) achieved this performance on a rocket flight in July 2012. We use Hi-C data to measure the Gaussian widths of 91 loops observed in the solar corona and find a distribution that peaks at about 270km. We also use Atmospheric Imaging Assembly (AIA) data for a subset of 79 of these loops and find that their temperature distributions are narrow. These observations provide further evidence that loops in the solar corona are structured at a scale of several hundred kilometers, well above the spatial scale of proposed physical mechanisms.

Brooks, David H; Ugarte-Urra, Ignacio; Winebarger, Amy R

2013-01-01T23:59:59.000Z

453

Moon and Sun Shadowing Observed by the MACRO Detector  

E-Print Network (OSTI)

Using over 40 million muons collected since 1989 by the MACRO detector we have searched for a depletion of muons coming from the direction of the Moon due to primary cosmic rays striking the Moon. We observe this Moon shadow in the expected position with a statistical significance of more than 5 standard deviations. We have analyzed the same data for an analogous Sun shadow, and have found a signal with a significance of about 4 standard deviations. The Sun shadow is displaced from the Sun's position by about 0.6 degrees North in ecliptic coordinates. This displacement is compatible with a deflection of primary cosmic rays due to the Interplanetary Magnetic Field in the 10-20 TeV primary energy range which is relevant to the underground muons observed by MACRO.

N. Giglietto; for the MACRO collaboration

1999-05-17T23:59:59.000Z

454

Fermi-LAT Observation of Quiet Solar Emission  

E-Print Network (OSTI)

The Large Area Telescope (LAT) on board Fermi has detected high-energy gamma rays from the quiet Sun produced by interactions of cosmic-ray nucleons with the solar surface and cosmic-ray electrons with solar photons in the heliosphere. Such observations provide a probe of the extreme conditions near the solar atmosphere and photosphere and permit the study of the modulation of cosmic rays over the inner heliosphere. For the first year of Fermi observations the solar modulation was at its minimum corresponding to a maximum cosmic-ray flux and, hence, maximum gamma-ray emission from the Sun. We discuss the study of the quiescent solar emission, including spectral analysis of its two components, disk and inverse Compton, using the first-year data of the mission and models using the electron spectrum measured by Fermi.

Orlando, Elena

2009-01-01T23:59:59.000Z

455

Polarization observables in pion photoproduction on light nuclei  

SciTech Connect

Single polarization observables {Sigma}, P, and T are investigated for the nucleon (p, n) and the trinucleon ({sup 3}He, {sup 3}H). The threshold E{sub 0+} and the resonance M{sub 1+} and E{sub 1+} multipoles are particularly studied. For the reaction {sup 3}He({gamma}, {pi}{sup +}){sup 3}H a recently developed nonlocal coupled-channel approach is presented that employs three-body Faddeev amplitudes and incorporates two-step processes such as {sup 3}He({gamma}, {pi}{sup o}){sup 3}He({pi}{sup o}, {pi}{sup +}){sup 3}H. Enhancement effects of the contributions from small components of the {sup 3}He wave function as well as from the {Delta} resonance E2 transition to the polarization observables have been found.

Tiator, L. [Universitaet Mainz (Germany). Institut fuer Kernphysik; Kamalov, S.S. [Laboratory of Theoretical Physics, Dubna (Russian Federation); Bennhold, C. [George Washington Univ., Washington, DC (United States)

1994-07-01T23:59:59.000Z

456

X-Ray Observations of Gamma-Ray Burst Afterglows  

E-Print Network (OSTI)

The discovery by the BeppoSAX satellite of X-ray afterglow emission from the gamma-ray burst which occurred on 28 February 1997 produced a revolution in our knowledge of the gamma-ray burst phenomenon. Along with the discovery of X-ray afterglows, the optical afterglows of gamma-ray bursts were discovered and the distance issue was settled, at least for long $\\gamma$-ray bursts. The 30 year mystery of the gamma-ray burst phenomenon is now on the way to solution. Here I rewiew the observational status of the X-ray afterglow emission, its mean properties (detection rate, continuum spectra, line features, and light curves), and the X-ray constraints on theoretical models of gamma-ray bursters and their progenitors. I also discuss the early onset afterglow emission, the remaining questions, and the role of future X-ray afterglow observations.

Filippo Frontera

2004-06-25T23:59:59.000Z

457

EVN observations of the lens system B0128+437  

E-Print Network (OSTI)

Previous VLBI observations of the lens system CLASS B0128+437 showed that the lensed source had a triple sub-component structure. However, one of the images looked very different to the others and it has been suggested that this is due to scatter-broadening in the ISM of the lensing galaxy. We present a new 21-cm EVN map of this system, the low frequency compared to previous epochs chosen as the scattering should be more pronounced at this frequency. Analysis of the new map is at an early stage, but the area of scattering in the affected image is extremely obvious. Other points of interest that we seek to explain are the very large sizes of the images (in conflict with the observed spectral turnover at about 1 GHz) and the different position angle of one of the images at different frequencies.

A. D. Biggs

2004-12-30T23:59:59.000Z

458

Why Do the Quantum Observables Form a Jordan Operator Algebra?  

E-Print Network (OSTI)

The Jordan algebra structure of the bounded real quantum observables was recognized already in the early days of quantum mechanics. While there are plausible reasons for most parts of this structure, the existence of the distributive nonassociative multiplication operation is hard to justify from a physical or statistical point of view. Considering the non-Boolean extension of classical probabilities, presented in a recent paper, it is shown in this paper that such a multiplication operation can be derived from certain properties of the conditional probabilities and the observables, i.e., from postulates with a clear statistical interpretation. The well-known close relation between Jordan operator algebras and C*-algebras then provides the connection to the quantum-mechanical Hilbert space formalism, thus resulting in a novel axiomatic approach to general quantum mechanics that includes the types II and III von Neumann algebras.

Gerd Niestegge

2010-01-21T23:59:59.000Z

459

Climatological Data For Clouds Over the Globe From Surface Observations,  

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

For Clouds Over the Globe From Surface Observations, For Clouds Over the Globe From Surface Observations, 1982-1991: The Total Cloud Edition (1994) (NDP-026a) data Data Investigators C. J. Hahn, S. G. Warren, and J. London Routine, synoptic surface weather reports from ships and land stations over the entire globe, for the10-year period December 1981 through November 1991, were processed for total cloud cover and the frequencies of occurrence of clear sky, sky-obscured due to precipitation, and sky-obscured due to fog. Archived data, consisting of various annual, seasonal and monthly averages, are provided in grid boxes that are typically 2.5° × 2.5° for land and 5° × 5° for ocean. Day and nighttime averages are also given separately for each season. Several derived quantities, such as interannual variations and annual and diurnal

460

X-RAY OBSERVATIONS OF HIGH-B RADIO PULSARS  

SciTech Connect

The study of high-magnetic-field pulsars is important for examining the relationships between radio pulsars, magnetars, and X-ray-isolated neutron stars (XINSs). Here, we report on X-ray observations of three such high-magnetic-field radio pulsars. We first present the results of a deep XMM-Newton observation of PSR J1734-3333, taken to follow up on its initial detection in 2009. The pulsar's spectrum is well fit by a blackbody with a temperature of 300 {+-} 60 eV, with bolometric luminosity L{sub bb}=2.0{sub -0.7}{sup +2.2} Multiplication-Sign 10{sup 32} erg s{sup -1}{approx}0.0036 E-dot for a distance of 6.1 kpc. We detect no X-ray pulsations from the source, setting a 1{sigma} upper limit on the pulsed fraction of 60% in the 0.5-3 keV band. We compare PSR J1734-3333 to other rotation-powered pulsars of similar age and find that it is significantly hotter, supporting the hypothesis that the magnetic field affects the observed thermal properties of pulsars. We also report on XMM-Newton and Chandra observations of PSRs B1845-19 and J1001-5939. We do not detect either pulsar, setting 3{sigma} upper limits on their blackbody temperatures of 48 and 56 eV, respectively. Despite the similarities in rotational properties, these sources are significantly cooler than all but one of the XINSs, which we attribute to the two groups having been born with different magnetic fields and hence evolving differently.

Olausen, S. A.; Kaspi, V. M. [Department of Physics, Rutherford Physics Building, McGill University, 3600 University Street, Montreal, Quebec, H3A 2T8 (Canada)] [Department of Physics, Rutherford Physics Building, McGill University, 3600 University Street, Montreal, Quebec, H3A 2T8 (Canada); Zhu, W. W. [Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC, V6T 1Z1 (Canada)] [Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC, V6T 1Z1 (Canada); Vogel, J. K. [Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA 94550 (United States)] [Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA 94550 (United States); Lyne, A. G.; Espinoza, C. M.; Stappers, B. W. [Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Manchester M13 9PL (United Kingdom)] [Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Manchester M13 9PL (United Kingdom); Manchester, R. N. [Australia Telescope National Facility, CSIRO Astronomy and Space Science, Epping, NSW 1710 (Australia)] [Australia Telescope National Facility, CSIRO Astronomy and Space Science, Epping, NSW 1710 (Australia); McLaughlin, M. A. [Department of Physics, West Virginia University, White Hall, Morgantown, WV 26506 (United States)] [Department of Physics, West Virginia University, White Hall, Morgantown, WV 26506 (United States)

2013-02-10T23:59:59.000Z

Note: This page contains sample records for the topic "observations classroom observations" 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

Topological Summation of Observables Measured with Dynamical Overlap Fermions  

E-Print Network (OSTI)

HMC histories for light dynamical overlap fermions tend to stay in a fixed topological sector for many trajectories, so that the different sectors are not sampled properly. Therefore the suitable summation of observables, which have been measured in separate sectors, is a major challenge. We explore several techniques for this issue, based on data for the chiral condensate and the (analogue of the) pion mass in the 2-flavour Schwinger model with dynamical overlap-hypercube fermions.

Wolfgang Bietenholz; Ivan Hip

2008-08-22T23:59:59.000Z

462

Evaluating climate models: Should we use weather or climate observations?  

Science Conference Proceedings (OSTI)

Calling the numerical models that we use for simulations of climate change 'climate models' is a bit of a misnomer. These 'general circulation models' (GCMs, AKA global climate models) and their cousins the 'regional climate models' (RCMs) are actually physically-based weather simulators. That is, these models simulate, either globally or locally, daily weather patterns in response to some change in forcing or boundary condition. These simulated weather patterns are then aggregated into climate statistics, very much as we aggregate observations into 'real climate statistics'. Traditionally, the output of GCMs has been evaluated using climate statistics, as opposed to their ability to simulate realistic daily weather observations. At the coarse global scale this may be a reasonable approach, however, as RCM's downscale to increasingly higher resolutions, the conjunction between weather and climate becomes more problematic. We present results from a series of present-day climate simulations using the WRF ARW for domains that cover North America, much of Latin America, and South Asia. The basic domains are at a 12 km resolution, but several inner domains at 4 km have also been simulated. These include regions of complex topography in Mexico, Colombia, Peru, and Sri Lanka, as well as a region of low topography and fairly homogeneous land surface type (the U.S. Great Plains). Model evaluations are performed using standard climate analyses (e.g., reanalyses; NCDC data) but also using time series of daily station observations. Preliminary results suggest little difference in the assessment of long-term mean quantities, but the variability on seasonal and interannual timescales is better described. Furthermore, the value-added by using daily weather observations as an evaluation tool increases with the model resolution.

Oglesby, Robert J [ORNL; Erickson III, David J [ORNL

2009-12-01T23:59:59.000Z

463

Spatial distribution of the interplanetary dust deduced by infrared observations  

Science Conference Proceedings (OSTI)

IR observations of the interplanetary dust performed by the ZIP rocket experiment are analyzed, focusing on the effect of experimental errors on the inversion procedure previously used to obtain the spatial distribution of the dust. Numerical simulation shows that the experimental errors are too large to reveal deviations of the dust density from a simple power-law radial distribution. The accuracy which would be required in future experiments is estimated. 9 refs.

De Bernardis, P.; Feminella, F.; Moreno, G. (Roma I Universita, Rome (Italy))

1991-03-01T23:59:59.000Z

464

Geomagnetic Disturbance (GMD) News and Observer, Edition 3  

Science Conference Proceedings (OSTI)

The Geomagnetic Disturbance (GMD) News and Observer is a new Electric Power Research Institute (EPRI) newsletter that provides information on geomagnetic disturbance projects in development, as well as a summary of new technology developments. This is the third issue of our newsletter, which will be published approximately quarterly, and provides progress reports and insights for the industry on this important topic.EPRI is working with the industry to assess system vulnerability and ...

2012-09-27T23:59:59.000Z

465

Geomagnetic Disturbance (GMD) News and Observer, Issue 5  

Science Conference Proceedings (OSTI)

Welcome to the fifth issue of our newsletter, GMD News and Observer. Published approximately quarterly, this newsletter provides progress reports and insights for the industry on the geomagnetic disturbance (GMD) area. This issue includes an update from NERC on its GMD Task Force work, a summary of a soon-to-be-published EPRI report on the impact of GICs on the North American Eastern and Western Interconnects, and noteworthy news, including the recent FERC final rulemaking on ...

2013-08-19T23:59:59.000Z

466

Geomagnetic Disturbance (GMD) News and Observer, Issue 2  

Science Conference Proceedings (OSTI)

The Geomagnetic Disturbance (GMD) News and Observer is a new Electric Power Research Institute (EPRI) newsletter that provides information on geomagnetic disturbance projects in development, as well as a summary of new technology developments. This is the second issue of our newsletter, which will be published approximately quarterly, and provides progress reports and insights for the industry on this important topic.EPRI is working with the industry to assess system vulnerability and ...

2012-09-12T23:59:59.000Z

467

Geomagnetic Disturbance (GMD) News and Observer, First Edition  

Science Conference Proceedings (OSTI)

The Geomagnetic Disturbance (GMD) News and Observer is a new Electric Power Research Institute (EPRI) newsletter that will be published quarterly and will provide information on geomagnetic disturbance projects in development, as well as a summary of new technology developments. This premier issue summarizes the current knowledge about GMDs and how transformers and the power system as a whole can be affected by GMDs. The following articles are featured in this issue: EPRI Executive Update, GMD Primer: Ho...

2012-08-10T23:59:59.000Z

468

Observation of inverted population levels in the FM-1 Spherator  

DOE Green Energy (OSTI)

Inversions in the populations of excited levels in hydrogen and HeII were observed in the FM-1 Spherator. The inversion increases strongly as the ratio of the decay time of the electron temperature to the decay time of the electron density was decreased. Time dependent numerical calculations of the populations were in good agreement with the experimental measurements. More general calculations for high Z hydrogen-like ions are discussed.

Suckewer, S.; Hawryluk, R. J.; Okabayashi, M.; Schmidt, J. A.

1976-04-01T23:59:59.000Z

469

Observation of Spin Flips with a Single Trapped Proton  

Science Conference Proceedings (OSTI)

Radio-frequency induced spin transitions of one individual proton are observed. The spin quantum jumps are detected via the continuous Stern-Gerlach effect, which is used in an experiment with a single proton stored in a cryogenic Penning trap. This is an important milestone towards a direct high-precision measurement of the magnetic moment of the proton and a new test of the matter-antimatter symmetry in the baryon sector.

Ulmer, S. [Max-Planck-Institut fuer Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg (Germany); Institut fuer Physik, Johannes Gutenberg-Universitaet Mainz, D-55099 Mainz (Germany); Ruprecht Karls-Universitaet Heidelberg, D-69047 Heidelberg (Germany); Rodegheri, C. C. [Max-Planck-Institut fuer Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg (Germany); Institut fuer Physik, Johannes Gutenberg-Universitaet Mainz, D-55099 Mainz (Germany); Blaum, K. [Max-Planck-Institut fuer Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg (Germany); Ruprecht Karls-Universitaet Heidelberg, D-69047 Heidelberg (Germany); Kracke, H.; Mooser, A.; Walz, J. [Institut fuer Physik, Johannes Gutenberg-Universitaet Mainz, D-55099 Mainz (Germany); Helmholtz Institut Mainz, D-55099 Mainz (Germany); Quint, W. [Ruprecht Karls-Universitaet Heidelberg, D-69047 Heidelberg (Germany); GSI--Helmholtzzentrum fuer Schwerionenforschung, D-64291 Darmstadt (Germany)

2011-06-24T23:59:59.000Z

470

Observation of the uranium 235 nuclear magnetic resonance signal (*)  

E-Print Network (OSTI)

L-1017 Observation of the uranium 235 nuclear magnetic resonance signal (*) H. Le Bail, C. Chachaty signal de résonance magnétique nucléaire de l'isotope 235 de l'uranium est présentée. Elle a été effectuée sur l'hexafluorure d'uranium pur, à l'état liquide à 380 K. Le rapport gyromagnétique mesuré est

Paris-Sud XI, Université de

471

Observational studies of stellar black hole binaries and ULXs  

E-Print Network (OSTI)

We outline a framework for understanding the X-ray spectra of high mass accretion rate stellar black holes based on X-ray data from RXTE and ASCA. Three spectral regimes can be separated out by the behaviour of the observed disk luminosity and temperature. The well established "standard regime" is seen when the disk dominates the spectrum, where only a small fraction of the luminosity is emitted in the power law tail. These spectra generally satisfy the standard relation expected for thermal emission from a constant area, namely that the disk bolometric luminosity, Ldisk, is proportional to its maximum temperature, Tin^4. However, at higher luminosities this starts to change to Tin^2. This "apparently standard regime" is still dominated by the disk emission, but this difference luminosity-temperature relation and subtle changes in spectral shape may show that another cooling process is required in addition to radiative cooling. At intermediate luminosities there is an anomalous regime (or weak very high state) where the disk temperature and luminosity are less clearly related. These spectra are characterized by the presence of a much stronger comptonized tail indicating high energy electrons. When observed disk emission is corrected for the the effects of comptonisation then these points lie back on the standard relation. The growth of this comptonising corona is also clearly linked to the quasi-periodic oscillations, as these are observed preferentially in the anomalous regime. This presented picture was found to explain the spectral behavior of both black hole binaries in our Galaxy and LMC. Spectral evolution of several bright ULXs observed with ASCA were also successfully explained in the same picture.

Aya Kubota; Kazuo Makishima

2005-07-12T23:59:59.000Z

472

Observational Constraints of Modified Chaplygin Gas in RS II Brane  

E-Print Network (OSTI)

FRW universe in RS II braneworld model filled with a combination of dark matter and dark energy in the form of modified Chaplygin gas (MCG) is considered. It is known that the equation of state (EoS) for MCG is a three-variable equation determined by $A$, $\\alpha$ and $B$. The permitted values of these parameters are determined by the recent astrophysical and cosmological observational data. Here we present the Hubble parameter in terms of the observable parameters $\\Omega_{m0}$, $\\Omega_{x0}$, $H_{0}$, redshift $z$ and other parameters like $A$, $B$, $C$ and $\\alpha$. From Stern data set (12 points), we have obtained the bounds of the arbitrary parameters by minimizing the $\\chi^{2}$ test. The best-fit values of the parameters are obtained by 66%, 90% and 99% confidence levels. Next due to joint analysis with BAO and CMB observations, we have also obtained the bounds of the parameters ($B,C$) by fixing some other parameters $\\alpha$ and $A$. The best fit value of distance modulus $\\mu(z)$ is obtained for the MCG model in RS II brane, and it is concluded that our model is perfectly consistent with the union2 sample data.

Chayan Ranjit; Prabir Rudra; Sujata Kundu

2013-04-24T23:59:59.000Z

473

HEATING OF FLARE LOOPS WITH OBSERVATIONALLY CONSTRAINED HEATING FUNCTIONS  

SciTech Connect

We analyze high-cadence high-resolution observations of a C3.2 flare obtained by AIA/SDO on 2010 August 1. The flare is a long-duration event with soft X-ray and EUV radiation lasting for over 4 hr. Analysis suggests that magnetic reconnection and formation of new loops continue for more than 2 hr. Furthermore, the UV 1600 Angstrom-Sign observations show that each of the individual pixels at the feet of flare loops is brightened instantaneously with a timescale of a few minutes, and decays over a much longer timescale of more than 30 minutes. We use these spatially resolved UV light curves during the rise phase to construct empirical heating functions for individual flare loops, and model heating of coronal plasmas in these loops. The total coronal radiation of these flare loops are compared with soft X-ray and EUV radiation fluxes measured by GOES and AIA. This study presents a method to observationally infer heating functions in numerous flare loops that are formed and heated sequentially by reconnection throughout the flare, and provides a very useful constraint to coronal heating models.

Qiu Jiong; Liu Wenjuan; Longcope, Dana W. [Department of Physics, Montana State University, Bozeman, MT 59717-3840 (United States)

2012-06-20T23:59:59.000Z

474

Constraining Galileon gravity from observational data with growth rate  

E-Print Network (OSTI)

We studied the cosmological constraints on the Galileon gravity obtained from observational data of the growth rate of matter density perturbations, the supernovae Ia (SN Ia), the cosmic microwave background (CMB), and baryon acoustic oscillations (BAO). For the same value of the energy density parameter of matter $\\Omega_{m,0}$, the growth rate $f$ in Galileon models is enhanced, relative to the $\\Lambda$CDM case, because of an increase in Newton's constant. The smaller $\\Omega_{m,0}$ is, the more growth rate is suppressed. Therefore, the best fit value of $\\Omega_{m,0}$ in the Galileon model, based only the growth rate data, is quite small. This is incompatible with the value of $\\Omega_{m,0}$ obtained from the combination of SN Ia, CMB, and BAO data. On the other hand, in the $\\Lambda$CDM model, the values of $\\Omega_{m,0}$ obtained from different observational data sets are consistent. In the analysis of this paper, we found that the Galileon model is less compatible with observations than the $\\Lambda$CDM model. This result seems to be qualitatively the same in most of the generalized Galileon models in which Newton's constant is enhanced.

Koichi Hirano; Zen Komiya; Hisato Shirai

2011-03-31T23:59:59.000Z

475

H.E.S.S. Observations of LS 5039  

E-Print Network (OSTI)

Recent observations of the binary system LS5039 with the High Energy Stereoscopic System (H.E.S.S.) revealed that its Very High Energy (VHE) gamma-ray emission is modulated at the 3.9 days orbital period of the system. The bulk of the emission is largely confined to half of the orbit, peaking around the inferior conjunction epoch of the compact object. The flux modulation provides the first indication of gamma-ray absorption by pair production on the intense stellar photon field. This implies that the production region size must be not significantly greater than the gamma-gamma photosphere size (~1 AU), thus excluding the large scale collimated outflows or jets (extending out to ~1000 AU). A hardening of the spectrum is also observed at the same epoch between 0.2 and a few TeV which is unexpected under a pure absorption scenario and could rather arise from variation with phase in the maximum electron energy and/or the dominant VHE gamma-ray production mechanism. This first-time observation of modulated gamma-ray emission allows precise tests of the acceleration and emission models in binary systems.

Mathieu De Naurois; the H. E. S. S. Collaboration Collaboration

2006-09-02T23:59:59.000Z

476

The empirical Earth rotation model from VLBI observations  

E-Print Network (OSTI)

AIMS: An alternative to the traditional method for modeling kinematics of the Earth's rotation is proposed. The purpose of developing the new approach is to provide a self-consistent and simple description of the Earth's rotation in a way that can be estimated directly from observations without using intermediate quantities. METHODS: Instead of estimating the time series of pole coordinates, the UT1--TAI angles, their rates, and the daily offsets of nutation, it is proposed to estimate coefficients of the expansion of a small perturbational rotation vector into basis functions. The resulting transformation from the terrestrial coordinate system to the celestial coordinate system is formulated as a product of an a priori matrix of a finite rotation and an empirical vector of a residual perturbational rotation. In the framework of this approach, the specific choice of the a priori matrix is irrelevant, provided the angles of the residual rotation are small enough to neglect their squares. The coefficients of the expansion into the B-spline and Fourier bases, together with estimates of other nuisance parameters, are evaluated directly from observations of time delay or time range in a single least square solution. RESULTS: This approach was successfully implemented in a computer program for processing VLBI observations. The dataset from 1984 through 2006 was analyzed. The new procedure adequately represents the Earth's rotation, including slowly varying changes in UT1--TAI and polar motion, the forced nutations, the free core nutation, and the high frequency variations of polar motion and UT1.

L. Petrov

2006-11-26T23:59:59.000Z

477

Observations of the atmospheric sulfur cycle on SAGA 3  

SciTech Connect

During the Soviet/American Gases and Aerosols (SAGA) 3 program in February and March 1991 the authors measured a wide variety of sulfur compounds simultaneously in the equatorial Pacific marine boundary layer. They made measurements of atmospheric dimethyl sulfide (DMS), sulfur dioxide (SO{sub 2}), and size-resolved aerosol non-sea-salt sulfate (NSS), and methane sulfonate (MSA). Some of the observed ratios contradict commonly held views of the marine sulfur cycle: the large DMS/NSS ratio implies that NSS may not be the primary product of DMS oxidation under some conditions. The authors also found much more DMS than SO{sub 2}, which may suggest that SO{sub 2} is not always an intermediate in DMS oxidation. The small SO{sub 2}/NSS ratio also supports the idea that most NSS was not formed from SO{sub 2}. Although the measured ratios of MSA/NSS were similar to previous observations in this region, much of the MSA was contained on supermicron particles, in contrast to both the NSS and the earlier MSA observations at higher latitudes. This implies that MSA/NSS ratios in ice cores may not accurately reflect the MSA/NSS ratios in their source areas. 51 refs., 4 figs., 3 tabs.

Huebert, B.J.; Howell, S.; Laj, P. [Univ. of Rhode Island, Narragansett, RI (United States); Johnson, J.E.; Bates, T.S.; Quinn, P.K. [NOAA/Pacific Marine Environmental Lab., Seattle, WA (United States); Yegorov, V. [State Committee for Hydrometeorology, Moscow (Russian Federation); Clarke, A.D.; Porter, J.N. [Univ. of Hawaii, Honolulu, HI (United States)

1993-09-20T23:59:59.000Z

478

Conjugate observations of Saturn's northern and southern H3+ aurorae  

E-Print Network (OSTI)

We present an analysis of recent high spatial and spectral resolution ground-based infrared observations of H3+ spectra obtained with the 10-metre Keck II telescope in April 2011. We observed H3+ emission from Saturn's northern and southern auroral regions, simultaneously, over the course of more than two hours, obtaining spectral images along the central meridian as Saturn rotates. Previous ground-based work has derived only an average temperature of an individual polar region, summing an entire night of observations. Here we analyse 20 H3+ spectra, 10 for each hemisphere, providing H3+ temperature, column density and total emission in both the northern and southern polar regions simultaneously, improving on past results in temporal cadence and simultaneity. We find that: 1) the average thermospheric temperatures are 527+/-18 K in northern Spring and 583+/-13 K in southern Autumn, respectively; 2) this asymmetry in temperature is likely to be the result of an inversely proportional relationship between the t...

O'Donoghue, James; Melin, Henrik; Cowley, Stan W H; Badman, Sarah V; Moore, Luke; Miller, Steve; Tao, Chihiro; Baines, Kevin H; Blake, James S D

2013-01-01T23:59:59.000Z

479

Chemical telemetry of OH observed to measure interstellar magnetic fields  

E-Print Network (OSTI)

We present models for the chemistry in gas moving towards the ionization front of an HII region. When it is far from the ionization front, the gas is highly depleted of elements more massive than helium. However, as it approaches the ionization front, ices are destroyed and species formed on the grain surfaces are injected into the gas phase. Photodissociation removes gas phase molecular species as the gas flows towards the ionization front. We identify models for which the OH column densities are comparable to those measured in observations undertaken to study the magnetic fields in star forming regions and give results for the column densities of other species that should be abundant if the observed OH arises through a combination of the liberation of H2O from surfaces and photodissociation. They include CH3OH, H2CO, and H2S. Observations of these other species may help establish the nature of the OH spatial distribution in the clouds, which is important for the interpretation of the magnetic field results.

S. Viti; T. W. Hartquist; P. C. Myers

2005-10-04T23:59:59.000Z

480

Carnegie Supernova Project: Observations of Type IIn Supernovae  

E-Print Network (OSTI)

The observational diversity displayed by various Type IIn supernovae (SNe IIn) is explored and quantified. In doing so a more coherent picture ascribing the variety of observed SNe IIn types to particular progenitor scenarios is sought. Carnegie Supernova Project (CSP) optical and near-infrared light curves and visual-wavelength spectroscopy of the Type IIn SNe 2005kj, 2006aa, 2006bo, 2006qq and 2008fq are presented. Combined with previously published observations of the Type IIn SNe 2005ip and 2006jd (Stritzinger et al. 2012), the full CSP sample is used to derive physical parameters which describe the nature of the interaction between the expanding SN ejecta and the circum-stellar material (CSM). For each SN of our sample we find counterparts, identifying objects similar to SNe 1994W (SN 2006bo), 1998S (SN 2008fq) and 1988Z (SN 2006qq). We present the unprecedented initial u-band plateau of SN 2006aa, and its peculiar late-time luminosity and temperature evolution. For each SN, assuming the CSM was formed b...

Taddia, F; Sollerman, J; Phillips, M M; Anderson, J P; Boldt, L; Campillay, A; Castellón, S; Contreras, C; Folatelli, G; Hamuy, M; Heinrich-Josties, E; Krzeminski, W; Morrell, N; Burns, C R; Freedman, W L; Madore, B F; Persson, S E; Suntzeff, N B

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "observations classroom observations" 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

Review of Multi-messenger observations of neutron rich matter  

E-Print Network (OSTI)

At very high densities, electrons react with protons to form neutron rich matter. This material is central to many fundamental questions in nuclear physics and astrophysics. Moreover, neutron rich matter is being studied with an extraordinary variety of new tools such as the Facility for Rare Isotope Beams (FRIB) and the Laser Interferometer Gravitational Wave Observatory (LIGO). We describe the Lead Radius Experiment (PREX) that uses parity violating electron scattering to measure the neutron radius of 208Pb. This has important implications for neutron stars and their crusts. We discuss X-ray observations of neutron star radii. These also have important implications for neutron rich matter. Gravitational waves (GW) open a new window on neutron rich matter. They come from sources such as neutron star mergers, rotating neutron star mountains, and collective r-mode oscillations. Using large scale molecular dynamics simulations, we find neutron star crust to be very strong. It can support mountains on rotating neutron stars large enough to generate detectable gravitational waves. Finally, neutrinos from core collapse supernovae (SN) provide another, qualitatively different probe of neutron rich matter. Neutrinos escape from the surface of last scattering known as the neutrino-sphere. This is a low density warm gas of neutron rich matter. Neutrino-sphere conditions can be simulated in the laboratory with heavy ion collisions. Observations of neutrinos can probe nucleosyntheses in SN. We believe that combing astronomical observations using photons, GW, and neutrinos, with laboratory experiments on nuclei, heavy ion collisions, and radioactive beams will fundamentally advance our knowledge of compact objects in the heavens, the dense phases of QCD, the origin of the elements, and of neutron rich matter.

C. J. Horowitz

2012-12-27T23:59:59.000Z

482

On active region loops: Hinode/EIS observations  

E-Print Network (OSTI)

Coronal loops are fundamental building blocks of the solar active regions and the corona. Therefore, a clear understanding of the physics of coronal loops will help us understand the physics of active region heating in particular and coronal heating in general. This requires a precise measurement of physical quantities such as electron densities and filling factors, temperatures, and flows in coronal loops. In this paper we have carried out an investigation of a spatially well resolved coronal loop using the EIS onboard Hinode to measure the above mentioned physical quantities. Based on this study we find that a nano-flare model could explain most of the observed characteristics of this loop.

Tripathi, D; Dwivedi, B N; Del Zanna, G; Young, P R

2009-01-01T23:59:59.000Z

483

Discrete Quantum Spectrum of Observable Correlations from Inflation  

E-Print Network (OSTI)

The decoherence of quantum fluctuations into classical perturbations during inflation is discussed. A simple quantum mechanical argument, using a spatial particle wavefunction rather than a field description, shows that observable correlations from inflation must have a discrete spectrum, since they originate and freeze into the metric within a compact region. The number of discrete modes is estimated using a holographic bound on the number of degrees of freedom. The discreteness may be detectable in some models; for example, if there is a fundamental universal frequency spectrum, the inflationary gravitational wave background may be resolvable into discrete emission lines.

Craig J. Hogan

2005-04-16T23:59:59.000Z

484

The Arctic Lower Troposphere Observed Structure (ALTOS) Campaign  

SciTech Connect

The ALTOS campaign focuses on operating a tethered observing system for routine in situ sampling of low-level (< 2 km) Arctic clouds. It has been a long-term hope to fly tethered systems at Barrow, Alaska, but it is clear that the Federal Aviation Administration (FAA) will not permit in-cloud tether systems at Barrow, even if unmanned aerial vehicle (UAV) operations are allowed in the future. We have provided the scientific rationale for long-term, routine in situ measurements of cloud and aerosol properties in the Arctic. The existing restricted air space at Oliktok offers an opportunity to do so.

Verlinde, J

2010-10-18T23:59:59.000Z

485

ILLUMINATING THE DARKEST GAMMA-RAY BURSTS WITH RADIO OBSERVATIONS  

Science Conference Proceedings (OSTI)

We present X-ray, optical, near-infrared (IR), and radio observations of gamma-ray bursts (GRBs) 110709B and 111215A, as well as optical and near-IR observations of their host galaxies. The combination of X-ray detections and deep optical/near-IR limits establish both bursts as ''dark''. Sub-arcsecond positions enabled by radio detections lead to robust host galaxy associations, with optical detections that indicate z {approx}bursts are dark due to substantial rest-frame extinction. Using the radio and X-ray data for each burst we find that GRB 110709B requires A{sub V}{sup host}{approx}>5.3 mag and GRB 111215A requires A{sub V}{sup host}{approx}>8.5 mag (assuming z = 2). These are among the largest extinction values inferred for dark bursts to date. The two bursts also exhibit large neutral hydrogen column densities of N{sub H,{sub int}} {approx}> 10{sup 22} cm{sup -2} (z = 2) as inferred from their X-ray spectra, in agreement with the trend for dark GRBs. Moreover, the inferred values are in agreement with the Galactic A{sub V} -N{sub H} relation, unlike the bulk of the GRB population. Finally, we find that for both bursts the afterglow emission is best explained by a collimated outflow with a total beaming-corrected energy of E{sub {gamma}} + E{sub K} Almost-Equal-To (7-9) Multiplication-Sign 10{sup 51} erg (z = 2) expanding into a wind medium with a high density, M Almost-Equal-To (6-20) Multiplication-Sign 10{sup -5} M{sub Sun} yr{sup -1} (n Almost-Equal-To 100-350 cm{sup -3} at Almost-Equal-To 10{sup 17} cm). While the energy release is typical of long GRBs, the inferred density may be indicative of larger mass-loss rates for GRB progenitors in dusty (and hence metal rich) environments. This study establishes the critical role of radio observations in demonstrating the origin and properties of dark GRBs. Observations with the JVLA and ALMA will provide a sample with sub-arcsecond positions and robust host associations that will help to shed light on obscured star formation and the role of metallicity in GRB progenitors.

Zauderer, B. A.; Berger, E.; Margutti, R.; Fong, W.; Laskar, T.; Chornock, R.; Soderberg, A. M. [Department of Astronomy, Harvard University, Cambridge, MA 02138 (United States); Levan, A. J. [Department of Physics, University of Warwick, Coventry CV4 7AL (United Kingdom); Olivares E, F.; Greiner, J. [Max-Planck-Institut fuer extraterrestrische Physik, Giessenbachstrasse, D-85748 Garching (Germany); Perley, D. A.; Horesh, A.; Carpenter, J. [Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, CA 91225 (United States); Updike, A. C. [Department of Chemistry and Physics, Roger Williams University, Bristol, RI 02809 (United States); Tanvir, N. R. [Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH (United Kingdom); Menten, K. M. [Max-Planck-Institut fuer Radioastronomie, D-53121 Bonn (Germany); Nakar, E. [Department of Astrophysics, Sackler School of Physics and Astronomy, Tel Aviv University, 69978 Tel Aviv (Israel); Chandra, P. [National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Pune University Campus, Ganeshkhind, Pune 411007 (India); Castro-Tirado, A. J. [Instituto de Astrofisica de Andalucia (IAA-CSIC), P.O. Box 03004, E-18080 Granada (Spain); Bremer, M. [Institut de Radioastronomie Millimetrique, 300 rue de la Piscine, F-38406 Saint Martin d'Heres (France); and others

2013-04-20T23:59:59.000Z

486

Observations of internal relaxation oscillations in the adiabatic toroidal compressor  

SciTech Connect

The soft x ray signal from the Adiabatic Toroidal compressor (ATC) sometimes exhibits a 10 percent modulation with a frequency between 1 and 2 Kilohertz. The radial profile of the soft x ray signal and the electron temperature determined by laser scattering indicate that these fluctuations are associated with a limitation of the central electron temperature and a broadening of the temperature profile. By observing changes in the radial dependence of the relaxation oscillation during neutral injection, an increase of thirty to fifty percent in the radius where q = 1 was measured. (auth)

Smith, R.R.

1975-10-01T23:59:59.000Z

487

Einstein x-ray observations of cataclysmic variables  

SciTech Connect

Observations with the imaging x-ray detectors on the Einstein Observatory have led to a large increase in the number of low luminosity x-ray sources known to be associated with cataclysmic variable stars (CVs). The high sensitivity of the Einstein instrumentation has permitted study of their short timescale variability and spectra. The data are adding significantly to our knowledge of the accretion process in cataclysmic variables and forcing some revision in our ideas concerning the origin of the optical variability in these stars.

Mason, K.O.; Cordova, F.A.

1982-01-01T23:59:59.000Z

488

Research Program towards Observation of Neutrino-Nucleus Coherent Scattering  

E-Print Network (OSTI)

The article describes the research program pursued by the TEXONO Collaboration towards an experiment to observe coherent scattering between neutrinos and the nucleus at the power reactor. The motivations of studying this process are surveyed. In particular, a threshold of 100-200 eV has been achieved with an ultra-low-energy germanium detector prototype. This detection capability at low energy can also be adapted to conduct searches of Cold Dark Matter in the low-mass region as well as to enhance the sensitivities in the study of neutrino magnetic moments.

Henry T. Wong

2005-11-01T23:59:59.000Z

489

Researchers Directly Observe Oxygen Signature in the Oxygen-evolving  

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

Researchers Directly Observe Oxygen Signature in the Researchers Directly Observe Oxygen Signature in the Oxygen-evolving Complex of Photosynthesis Arguably the most important chemical reaction on earth is the photosynthetic splitting of water to molecular oxygen by the Mn-containing oxygen-evolving complex (Mn-OEC) in the protein known as photosystem II (PSII). It is this reaction which has, over the course of some 3.8 billion years, gradually filled our atmosphere with O2 and consequently enabled and sustained the evolution of complex aerobic life. Coupled to the reduction of carbon dioxide, biological photosynthesis contributes foodstuffs for nutrition while recycling CO2 from the atmosphere and replacing it with O2. By utilizing sunlight to power these energy-requiring reactions, photosynthesis also serves as a model for addressing societal energy needs as we enter an era of diminishing fossil fuel resources and climate change. Understanding, at the molecular level, the dynamics and mechanisms behind photosynthesis is of fundamental importance and will prove critical to the future design of devices aimed at converting sunlight into electrochemical energy and transportable fuel.

490

Observation of Tau Decays with Two Neutral Kaons  

E-Print Network (OSTI)

We report on the observation of the decay \\Gamma ! K 0 K 0 \\Gamma in 3.11 fb \\Gamma1 of data taken with the CLEO II detector at the Cornell Electron Storage Ring. Both K 0 mesons are detected through their decays via K S ! + \\Gamma . Preliminary results on the branching fraction and on the resonant substructure are presented. In particular, we find B( \\Gamma ! K 0 K 0 \\Gamma ) = 0:083 \\Sigma 0:017 \\Sigma 0:017 %. We also comment on the sensitivity of the KK invariant mass spectrum to a non-zero tau-neutrino mass. Permanent address: University of Hawaii at Manoa y Permanent address: INP, Novosibirsk, Russia 2 I. INTRODUCTION Tau lepton decays of the type \\Gamma ! [KK] \\Gamma have been known to exist [1] for nearly a decade. However, due to the small decay width and difficulties associated with identifying kaons, little information is presently available for these decays. In this paper, we report on the observation of KK decays where both...

Balest Cho Ford; Ichep Ref; Gsl Cleo Conf; K. Cho; K. Lingel; M. Lohner; P. Rankin

1994-01-01T23:59:59.000Z

491

A tropical « NAT-like » belt observed from space  

E-Print Network (OSTI)

The optical properties of cold tropical tropopause clouds are examined on a global scale, using two years of space-borne lidar observations from CALIPSO (June 2006- May 2008). The linear depolarization ratio, color ratio and backscatter signal are analyzed in tropical clouds colder than 200 K in a way similar to recent studies of Polar Stratospheric Clouds (PSCs). It is found that the three categories of particles encountered in PSC (Ice, Sulfate Ternary Solutions or STS, and Nitric Acid Trihydrate or NAT) do also occur in tropical cold cloud layers. Particles with optical properties similar to NAT are few, but they cover the hal-00439695, version 1- 8 Dec 2009 tropical belt and represent about 20 % of cold cloud tropical particles all year long. The optical behavior of these particles requires them to be very small, non-spherical, optically thin, and persistent in the TTL at temperatures colder than 200 K; NAT particles and very small ice crystals meet these criteria and are right now the best candidates to explain the presented observations. 2

unknown authors

2009-01-01T23:59:59.000Z

492

XMM-Newton timing mode observations of Mrk 421  

E-Print Network (OSTI)

We present the results of a detailed temporal analysis of the bright BL Lac object Mrk 421 using the three available long timing mode observations by the EPIC PN camera. This detector mode is characterized by its long life time and is largely free of photon pile-up problems. The source was found in different intensity and variability states differing by up to more than a factor of three in count rate. A time resolved cross correlation analysis between the soft and hard energy bands revealed that the characteristics of the correlated emission, with lags of both signs, change on time scales of a few thousand seconds. Individual spectra, resolved on time scales of a few hundread seconds, can be quite well fitted by a broken power law. We find significant spectral variations on time scales as short as 500-1000 sec. Both the hard and the soft band spectral indices show a non-linear correlation with the source flux. A comparison of the observed light curves with numerical results from relativistic hydrodynamic computer simulations of the currently favored shock-in-jet models indicates that any determination of the jet's physical parameters from `simple' emission models must be regarded with caution: at any time we are seeing the emission from several emission regions distinct in space and time, which are connected by the complex hydrodynamic evolution of the non-uniform jet.

W. Brinkmann; I. E. Papadakis; C. Raeth; P. Mimica; F. Haberl

2005-08-20T23:59:59.000Z

493

POST-CORONAL MASS EJECTION PLASMA OBSERVED BY HINODE  

Science Conference Proceedings (OSTI)

In the present work we study the evolution of an active region after the eruption of a coronal mass ejection (CME) using observations from the EIS and XRT instruments on board Hinode. The field of view includes a post-eruption arcade, a current sheet, and a coronal dimming. The goal of this paper is to provide a comprehensive set of measurements for all these aspects of the CME phenomenon made on the same CME event. The main physical properties of the plasma along the line of sight-electron density, thermal structure, plasma composition, size, and, when possible, mass-are measured and monitored with time for the first three hours following the CME event of 2008 April 9. We find that the loop arcade observed by EIS and XRT may not be related to the post-eruption arcade. Post-CME plasma is hotter than the surrounding corona, but its temperature never exceeds 3 MK. Both the electron density and thermal structure do not show significant evolution with time, while we found that the size of the loop arcade in the Hinode plane of the sky decreased with time. The plasma composition is the same in the current sheet, in the loop arcade, and in the ambient plasma, so all these plasmas are likely of coronal origin. No significant plasma flows were detected.

Landi, E. [Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor, MI 48109 (United States); Raymond, J. C.; Miralles, M. P. [Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138 (United States); Hara, H. [National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo 181-8588 (Japan)

2012-05-20T23:59:59.000Z

494

Ground-state OH observations towards NGC 6334  

E-Print Network (OSTI)

We have made observations of the four hyperfine transitions of the 2Pi(3/2), J=3/2 ground state of OH at 1612, 1665, 1667 and 1720 MHz and the related 1.6-GHz continuum emission, towards NGC 6334 using the Australia Telescope Compact Array. The observations covered all the major radio continuum concentrations aligned along the axis of NGC 6334 (V, A to F). We have detected seven OH masers plus a possible faint eighth maser; two of these masers are located towards NGC 6334-A. Absorption at 1665 and 1667 MHz was detected towards almost all the continuum distribution. All transitions showed non-LTE behaviour. The 1667-/1665-MHz intensity ratios ranged from 1.0 to 1.2, significantly less than their LTE value of 1.8. The results of the OH `Sum Rule' suggest that this discrepancy cannot be explained solely by high optical depths. The 1612- and 1720-MHz line-profiles showed conjugate behaviour whereby one line was in absorption and the other in emission. In addition, the profiles commonly showed a flip from absorption to emission and vice versa, which has been interpreted as a density gradient. The OH line-to-continuum distribution, optical depth and velocity trends are consistent with a bar-like shape for the molecular gas which wraps around the continuum emission.

K. J. Brooks; J. B. Whiteoak

2000-10-19T23:59:59.000Z

495

Quantitative Measurements of CME-driven Shocks from LASCO Observations  

E-Print Network (OSTI)

In this paper, we demonstrate that CME-driven shocks can be detected in white light coronagraph images and in which properties such as the density compression ratio and shock direction can be measured. Also, their propagation direction can be deduced via simple modeling. We focused on CMEs during the ascending phase of solar cycle 23 when the large-scale morphology of the corona was simple. We selected events which were good candidates to drive a shock due to their high speeds (V>1500 km/s). The final list includes 15 CMEs. For each event, we calibrated the LASCO data, constructed excess mass images and searched for indications of faint and relatively sharp fronts ahead of the bright CME front. We found such signatures in 86% (13/15) of the events and measured the upstream/downstream densities to estimate the shock strength. Our values are in agreement with theoretical expectations and show good correlations with the CME kinetic energy and momentum. Finally, we used a simple forward modeling technique to estimate the 3D shape and orientation of the white light shock features. We found excellent agreement with the observed density profiles and the locations of the CME source regions. Our results strongly suggest that the observed brightness enhancements result from density enhancements due to a bow-shock structure driven by the CME.

Veronica Ontiveros; Angelos Vourlidas

2008-11-24T23:59:59.000Z

496

Observation of multiple sausage oscillations in cool postflare loop  

E-Print Network (OSTI)

Using simultaneous high spatial (1.3 arc sec) and temporal (5 and 10 s) resolution H-alpha observations from the 15 cm Solar Tower Telescope at ARIES, we study the oscillations in the relative intensity to explore the possibility of sausage oscillations in the chromospheric cool postflare loop. We use standard wavelet tool, and find the oscillation period of ~ 587 s near the loop apex, and ~ 349 s near the footpoint. We suggest that the oscillations represent the fundamental and the first harmonics of fast sausage waves in the cool postflare loop. Based on the period ratio P1/P2 ~ 1.68, we estimate the density scale height in the loop as ~ 17 Mm. This value is much higher than the equilibrium scale height corresponding to H-alpha temperature, which probably indicates that the cool postflare loop is not in hydrostatic equilibrium. Seismologically estimated Alfv\\'en speed outside the loop is ~ 300-330 km/s. The observation of multiple oscillations may play a crucial role in understanding the dynamics of lower solar atmosphere, complementing such oscillations already reported in the upper solar atmosphere (e.g., hot flaring loops).

A. K. Srivastava; T. V. Zaqarashvili; W. Uddin; B. N. Dwivedi; Pankaj Kumar

2008-06-05T23:59:59.000Z

497

New Cosmological Model and Its Implications on Observational Data Interpretation  

E-Print Network (OSTI)

The paradigm of \\Lambda CDM cosmology works impressively well and with the concept of inflation it explains the universe after the time of decoupling. However there are still a few concerns; after much effort there is no detection of dark matter and there are significant problems in the theoretical description of dark energy. We will consider a variant of the cosmological spherical shell model, within FRW formalism and will compare it with the standard \\Lambda CDM model. We will show that our new topological model satisfies cosmological principles and is consistent with all observable data, but that it may require new interpretation for some data. Considered will be constraints imposed on the model, as for instance the range for the size and allowed thickness of the shell, by the supernovae luminosity distance and CMB data. In this model propagation of the light is confined along the shell, which has as a consequence that observed CMB originated from one point or a limited space region. It allows to interpret the uniformity of the CMB without inflation scenario. In addition this removes any constraints on the uniformity of the universe at the early stage and opens a possibility that the universe was not uniform and that creation of galaxies and large structures is due to the inhomogeneities that originated in the Big Bang.

B. Vlahovic

2013-03-03T23:59:59.000Z

498

Total lightning observations of severe convection over North Texas  

E-Print Network (OSTI)

Five severe convective cells over North Texas from three separate dates were examined to determine what three dimensional, or “total” lightning data can add to the understanding of a convective cell’s intensity, propagation, and severe weather potential. Total lightning data were obtained from Vaisala Inc.’s Dallas/Fort Worth (D/FW) Lightning Detection and Ranging (LDAR) network. Radar data from two Weather Surveillance Radar – 1988 Doppler (WSR-88D) sites were used for position data and information regarding the intensity and kinematic properties of each cell. Total lightning products used by the National Weather Service Forecast Office in Fort Worth, Texas were compared to total lightning flash rate; a quantity that has been shown to be correlated to changes in cell intensity inferred from other sources, such as radar and satellite data. These products, specifically flash extent density (FED) were also compared to CG flash rate and radar derived measures from the WSR-88D sites. The results of this work show that FED and total flash rate are well correlated, with an average Pearson correlation value of 0.73, indicating that previous total flash rate results may also apply to FED. Lightning hooks, holes, and notches in FED displays indicated likely updraft regions, while appendages were observed to develop prior to deviant motion with two supercells. These results, combined with a greater update frequency provided a useful complement to radar data in the warning decision process. FED jumps were observed prior to several severe weather reports, indicating that total lightning activity may be related to updraft strength as found in past studies. However, FED jumps were sometimes observed without any associated severe event. More work is clearly needed to define what FED changes are of most importance in the short-term prediction of storm severity. The usefulness of the total lightning data on these dates was dependant upon LDAR network status and distance of the cell from the network center. The results of this study suggest that combining total flash rate trends with visual displays of FED provides the greatest added benefit to forecasters in maintaining situational awareness during warning operations.

McKinney, Christopher Michael

2008-08-01T23:59:59.000Z

499

Aerosol observing system platform integration and AAF instrumentation  

SciTech Connect

As part of the federal government’s 2009 American Recovery and Reinvestment Act (ARRA), the U.S. DOE Office of Science allocated funds for the capital upgrade of the Atmospheric Radiation Measurement (ARM) Climate Research Facility to improve and expand observational capabilities related to cloud and aerosol properties. The ARM Facility was established as a national user facility for the global scientific community to conduct a wide range of interdisciplinary science. Part of the ARRA-funded expansion of the ARM Facility includes four new Aerosol Observing Systems (AOS) to be designed, instrumented, and mentored by BNL. The enclosures will be customized SeaTainers. These new platforms ([AMF2]: ARM Mobile Facility-2; [TWP-D]: Tropical Western Pacific at Darwin; and [MAOS-A]/[MAOS-C]: Mobile Aerosol Observing System-Aerosol/-Chemistry) will provide a laboratory environment for fielding instruments to collect data on aerosol life cycle, microphysics, and optical/physical properties. The extensive instrument suite includes both established methods and initial deployments of new techniques to add breadth and depth to the AOS data sets. The platforms are designed: (1) to have all instruments pre-installed before deployment, allowing a higher measurement duty cycle; (2) with a standardized configuration improving the robustness of data inter-comparability; (3) to provide remote access capability for instrument mentors; and (4) to readily accommodate guest instrumentation. The first deployment of the AMF2 platform will be at the upcoming StormVEx campaign held at Steamboat Springs, Colorado, October 15, 2010–March 31, 2011 while the TWP-D AOS will be stationed at the ARM Darwin site. The maiden deployments of the MAOS-A and MAOS-C platforms will be during the Ganges Valley Experiment (GVAX) scheduled for April 2011–April 2012. In addition to the ground-based AOS platforms, thee major instrument builds for the AAF are also being undertaken (new trace gas package [NO, NOx, NOy, CO, O3, and SO2]; Scanning Mobility Particle Sampler [SMPS]; and Particle into Liquid Sampler [PILS]). The current status of the AOS platforms, instrument suites, instituted QA/QC activities, projected AOS VAPs, and inlet design, as well as still-unresolved issues, will be presented.

Springston, S.; Sedlacek, A.

2010-03-15T23:59:59.000Z

500

OBSERVATION REPORT BendKing Pipe Bending Machine.doc  

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

BENDKING PIPE BENDING MACHI\NE BENDKING PIPE BENDING MACHI\NE DEMONSTRATION Field Observation Report for December 3 - 4, 2001 Date Published: March 2002 Brian Meindinger, RMOTC PREPARED FOR THE U.S. DEPARTMENT OF ENERGY ROCKY MOUNTAIN OILFIELD TESTING CENTER 907 N. POPLAR, SUITE 150 CASPER, WY 82601 1-888-599-2200 Approval: RMOTC Manager_____________________________ Date:______________ Disclaimer This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, nor any of their contractors, subcontractors, or their employees makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or any third party's use or the results of such use of any