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1

Carol Hawk  

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

Carol Hawk is the Program Manager for Cyber Security for Energy Delivery Systems in the Office of Electricity Delivery and Energy Reliability.

2

Stephen Hawking Quantum Gravity  

E-Print Network (OSTI)

Stephen Hawking and Quantum Gravity Matt Visser Physics Department Washington University Saint Louis USA Science Saturdays 4 Nov 2000 #12; Stephen Hawking and Quantum Gravity Abstract: Through research, Stephen Hawking has captured a place in the popular imagina- tion. Quantum gravity in its various

Visser, Matt

3

Broad-Winged hawks  

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

rabbits, snakes and large insects such as grasshoppers, crickets and beetles. The Red-shouldered Hawk has similar habits of soaring, mating and nesting. They differ...

4

The Marsh Hawk  

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

back and forth like a well-trained bird dog. Now and then it makes a few deliberate wing strokes but when it spies a moving prey the hawk halts -- may even do a back...

5

hawk.html  

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

as you walk or drive through Fermilab and you may see a Red-tailed hawk perched on a street light, road sign, or tree branch, or soaring gracefully through the air. Sources...

6

Black Hawk Lake Fresno River  

E-Print Network (OSTI)

Black Hawk Lake Fresno River R D 4 0 0 RD 415 HWY41 RD 207 REVISRD YO SEM ITE SP RINGS P KY LILLEY County Rosedale Ranch Revis Mountain Daulton Spring Red Top Lookout Buford Mountain Black Hawk Lake

Wang, Zhi

7

BLACK THUNDER COAL MINE AND LOS ALAMOS NATIONAL LABORATORY EXPERIMENTAL STUDY  

E-Print Network (OSTI)

BLACK THUNDER COAL MINE AND LOS ALAMOS NATIONAL LABORATORY EXPERIMENTAL STUDY OF SEISMIC ENERGY of Explosive Engineers, 2-5 Feb 97, Las Vegas, NV #12;BLACK THUNDER COAL MINE AND LOS ALAMOS NATIONAL and David Gross Thunder Basin Coal Company Post Office Box 406 Wright, Wyoming 82732 D. Craig Pearson

8

Climatography of Thunder Events in the Conterminous United States. Part I: Temporal Aspects  

Science Conference Proceedings (OSTI)

Average durations of thunder events are greatest (>120 min) in the OklahomaKansas area and least (<60 min) along the west coast and northeast. The average point duration of thunder activity ranges from 10 000 to 12 000 min along the Gulf Coast, ...

Stanley A. Changnon Jr.

1988-04-01T23:59:59.000Z

9

Hawking Emission and Black Hole Thermodynamics  

E-Print Network (OSTI)

A brief review of Hawking radiation and black hole thermodynamics is given, based largely upon hep-th/0409024.

Don N. Page

2006-12-18T23:59:59.000Z

10

Women @ Energy: Carol Hawk | Department of Energy  

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

Carol Hawk Carol Hawk Women @ Energy: Carol Hawk March 13, 2013 - 5:05pm Addthis Dr. Carol Hawk is the Manager of the Cybersecurity for Energy Delivery Systems (CEDS) Program for the office of Electricity Delivery and Energy Reliability in the Department of Energy (DOE) Dr. Carol Hawk is the Manager of the Cybersecurity for Energy Delivery Systems (CEDS) Program for the office of Electricity Delivery and Energy Reliability in the Department of Energy (DOE) Dr. Carol Hawk is the Manager of the Cybersecurity for Energy Delivery Systems (CEDS) Program for the office of Electricity Delivery and Energy Reliability in the Department of Energy (DOE). Her current duties include coordinating the CEDS program, which includes an industry-directed program, a research-directed program, the National SCADA test bed program, and an

11

Women @ Energy: Carol Hawk | Department of Energy  

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

Carol Hawk Carol Hawk Women @ Energy: Carol Hawk March 13, 2013 - 5:05pm Addthis Dr. Carol Hawk is the Manager of the Cybersecurity for Energy Delivery Systems (CEDS) Program for the office of Electricity Delivery and Energy Reliability in the Department of Energy (DOE) Dr. Carol Hawk is the Manager of the Cybersecurity for Energy Delivery Systems (CEDS) Program for the office of Electricity Delivery and Energy Reliability in the Department of Energy (DOE) Dr. Carol Hawk is the Manager of the Cybersecurity for Energy Delivery Systems (CEDS) Program for the office of Electricity Delivery and Energy Reliability in the Department of Energy (DOE). Her current duties include coordinating the CEDS program, which includes an industry-directed program, a research-directed program, the National SCADA test bed program, and an

12

Summer Cumulus Cloud Seeding Experiments near Yellowknife and Thunder Bay, Canada  

Science Conference Proceedings (OSTI)

A summer (June and July) cumulus cloud seeding experiment was conducted in Canada near Yellowknife in 1975 and 1976, and Thunder Bay in 1977 and 1978. Microphysical and dynamical measurements were made with three instrumented aircraft, flying in ...

G. A. Isaac; J. W. Strapp; R. S. Schemenauer; J. I. Macpherson

1982-09-01T23:59:59.000Z

13

Smart Grid Security Educational Training with ThunderCloud: A Virtual Security Test Bed  

Science Conference Proceedings (OSTI)

In this paper, we describe a cloud based virtual smart grid test bed: ThunderCloud, which can be used for domain-specific security educational training applicable to the smart grid environment. The test bed consists of virtual machines connected using ... Keywords: Domain-Specific Security Training, Smart Grid, Virtual Test Bed

Joseph Stites, Ambareen Siraj, Eric L. Brown

2013-10-01T23:59:59.000Z

14

On Hawking radiation of 2d Liouville black hole  

E-Print Network (OSTI)

We adapt the method of complex paths to the study of the radiation of Hawking of Liouville black holes.

Chabab, M; Sedra, M B

2011-01-01T23:59:59.000Z

15

On the Mutual Information in Hawking Radiation  

E-Print Network (OSTI)

We compute the mutual information of two Hawking particles emitted consecutively by an evaporating black hole. Following Page, we find that the mutual information is of order exp(-S) where S is the entropy of the black hole. We speculate on implications for black hole unitarity, in particular on a possible failure of locality at large distances.

Iizuka, Norihiro

2013-01-01T23:59:59.000Z

16

The Hawking-Unruh phenomenon on graphene  

E-Print Network (OSTI)

We find that, for a very specific shape of a monolayer graphene sample, a general relativistic-like description of a back-ground spacetime for graphene's conductivity electrons is very natural. The corresponding electronic local density of states is of finite temperature. This is a Hawking-Unruh effect that we propose to detect through an experiment with a Scanning Tunneling Microscope.

Alfredo Iorio; Gaetano Lambiase

2011-08-11T23:59:59.000Z

17

The LANL/LLNL/AFTAC Black Thunder Coal Mine regional mine monitoring experiment  

SciTech Connect

Cast blasting operations associated with near surface coal recovery provide relatively large explosive sources that generate regional seismograms of interest in monitoring a Comprehensive Test Ban Treaty (CTBT). This paper describes preliminary results of a series of experiments currently being conducted at the Black Thunder Coal Mine in northeast Wyoming as part of the DOE CTBT Research and Development Program. These experiments are intended to provide an integrated set of near-source and regional seismic data for the purposes of quantifying the coupling and source characterization of the explosions. The focus of this paper is on the types of data being recovered with some preliminary implications. The Black Thunder experiments are designed to assess three major questions: (1) how many mining explosions produce seismograms at regional distances that will have to be detected, located and ultimately identified by the National Data Center and what are the waveform characteristics of these particular mining explosions; (2) can discrimination techniques based on empirical studies be placed on a firm physical basis so that they can be applied to other regions where there is little monitoring experience; (3) can large scale chemical explosions (possibly mining explosions) be used to calibrate source and propagation path effects to regional stations, can source depth of burial and decoupling effects be studied in such a controlled environment? With these key questions in mind and given the cooperation of the Black Thunder Mine, a suite of experiments have been and are currently being conducted. This paper will describe the experiments and their relevance to CTBT issues.

Pearson, D.C.; Stump, B.W.; Baker, D.F.; Edwards, C.L.

1995-09-01T23:59:59.000Z

18

Hawking radiation via Landauer transport model  

E-Print Network (OSTI)

Recently, Nation et al confirmed that fluxes of Hawking radiation energy and entropy from a black hole can be regarded as a one-dimensional (1D) Landauer transport process. Their work can be extended to background spacetimes with gauge potential. The result shows that the energy flux, which is indicated to be equal to the energy-momentum tensor flux, contains not only the contribution of thermal flux but also that of particle flux. We find that the charge can also be regarded as transporting via a 1D quantum channel and the charge flux is equal to the gauge flux.

Xiao-Xiong Zeng; Wen-Biao Liu

2011-06-03T23:59:59.000Z

19

Rolling Thunder -- Integration of the Solo 161 Stirling engine with the CPG-460 solar concentrator at Ft. Huachuca  

DOE Green Energy (OSTI)

Project Rolling Thunder is a dish/Stirling demonstration project at Ft. Huachuca, a US Army fort in southeastern Arizona (Huachuca means rolling thunder in Apache). It has been supported by the Strategic Environmental Research and Development Program (SERDP), a cooperative program between the Department of Defense (DoD) and the Department of Energy (DOE). As part of a 1992 SERDP project, Cummins Power Generation, Inc. (CPG) installed a CPG 7 kW(c) dish/Stirling system at the Joint Interoperability Test Command (JITC) in Ft. Huachuca, Arizona. The primary objective of the SERDP Dish/Stirling for DoD Applications project was to demonstrate a CPG 7-kW(c) dish/Stirling system at a military facility. Unfortunately, Cummins Engine Company decided to divest its solar operations. As a direct result of Ft. Huachuca`s interest in the Cummins dish/Stirling technology, Sandia explored the possibility of installing a SOLO 161 Stirling power conversion unit (PCU) on the Ft. Huachuca CPG-460. In January 1997, a decision was made to retrofit a SOLO 161 Stirling engine on the CPG-460 at Ft. Huachuca. Project Rolling Thunder. The SOLO 161 Demonstration at Ft. Huachuca has been a challenge. Although, the SOLO 161 PCU has operated nearly flawlessly and the CPG-460 has been, for the most part, a solid and reliable component, integration of the SOLO PCU with the CPG-460 has required significant attention. In this paper, the integration issues and technical approaches of project Rolling Thunder are presented. Lessons of the project are also discussed.

Diver, R.B.; Moss, T.A.; Goldberg, V.; Thomas, G.; Beaudet, A.

1998-09-01T23:59:59.000Z

20

Roar of the Thunder Dragon: the Bhutanese Audio-visual Industry and the Shaping and Representation of Contemporary Culture  

E-Print Network (OSTI)

Roar of the Thunder Dragon: The Bhutanese Audio-visual Industry and the Shaping and Representation of Contemporary Culture Tshewang Dendup? A Bhutanese journalist recently remarked that these days, the phones dont ring, they sing. And when... , through the support of the BCCI has approached the Ministry of Works and Human Settlement for the allocation of theater space in the urban areas. The MPAB has already received applications from Bumthang and Chukha. Piracy Tobgye of Mila Communications...

Dendup, Tshewang

2006-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "thunder hawk mc734" 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

Hawking radiation via anomaly cancellation for the black holes of five-dimensional minimal gauged supergravity  

E-Print Network (OSTI)

The anomaly cancellation method proposed by Wilczek et al. is applied to the general charged rotating black holes in five-dimensional minimal gauged supergravity. Thus Hawking temperature and fluxes are found. The Hawking ...

Porfyriadis, Achilleas P.

22

The Atlantic Richfield Company Black Thunder mine haul road dust study. [Wyoming  

Science Conference Proceedings (OSTI)

An examination of the effectiveness of various haul road dust control measures was performed at ARCO's Black Thunder Mine near Wright, Wyoming by evaluating both visible observations and quantitative measurements of particle concentrations. In order to evaluate dust control effectiveness both a 300 foot (91.5 meter) and 175 foot (53.4 meter) section of the main coal haul road was selected for testing. The test sections were separated by a 200 foot (61 meter) buffer zone. Each test section was relatively straight and away from interferences from other mine sources. The five haul road treatment test sequences evaluated for control measure effectiveness were: an untreated road segment; water treatment two times per hour; water treatment four times per hour; previously chemically treated segment of haul road (ARCO 2400 dust suppressant); and testing after application of Coherex (10% dilution). By comparing uncontrolled situations with various controlled situations, an estimate of the control efficiency of the dust control measures was determined. Based upon the results of the study a fugitive dust control scheme was selected considering control effectiveness, economics and operational efficiency.

Maxwell, D.R.; Hormel, T.R.; Ives, J.A.

1982-06-01T23:59:59.000Z

23

MHK Technologies/RED HAWK | Open Energy Information  

Open Energy Info (EERE)

RED HAWK RED HAWK < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage RED HAWK.jpg Technology Profile Primary Organization Natural Currents Energy Services Project(s) where this technology is utilized *MHK Projects/Avalon Tidal *MHK Projects/BW2 Tidal *MHK Projects/Cape Cod Tidal Energy Project *MHK Projects/Cape May Tidal Energy *MHK Projects/Cohansey River Tidal Energy *MHK Projects/Dorchester Maurice Tidal *MHK Projects/Fishers Island Tidal Energy Project *MHK Projects/Gastineau Channel Tidal *MHK Projects/Highlands Tidal Energy Project *MHK Projects/Killisnoo Tidal Energy *MHK Projects/Margate Tidal *MHK Projects/Maurice River Tidal *MHK Projects/Mohawk MHK Project *MHK Projects/Orient Point Tidal *MHK Projects/Rockaway Tidal Energy Plant

24

Short-distance contribution to the spectrum of Hawking radiation  

E-Print Network (OSTI)

The Hawking effect can be rederived in terms of two-point functions and in such a way that it makes it possible to estimate, within the conventional semiclassical theory, the contribution of ultrashort distances to the Planckian spectrum. For Schwarzschild black holes of three solar masses the analysis shows that Hawking radiation is very robust up to frequencies of 96 T_H or 270 T_H for bosons and fermions, respectively. For primordial black holes (with masses around 10^{15} g) these frequencies turn out to be of order 52T_H and 142 T_H. Only at these frequencies and above do we find that the contribution of Planck distances is of order of the total spectrum itself. Below this scale, the contribution of ultrashort distances to the spectrum is negligible. This suggests that only above these frequencies could an underlying quantum theory of gravity potentially predict significant deviations from Hawking's semiclassical result.

I. Agullo; J. Navarro-Salas; Gonzalo J. Olmo; Leonard Parker

2006-11-30T23:59:59.000Z

25

Preliminary report on the Black Thunder, Wyoming CTBT R and D experiment quicklook report: LLNL input from regional stations  

SciTech Connect

This report presents a preliminary summary of the data recorded at three regional seismic stations from surface blasting at the Black Thunder Coal Mine in northeast Wyoming. The regional stations are part of a larger effort that includes many more seismic stations in the immediate vicinity of the mine. The overall purpose of this effort is to characterize the source function and propagation characteristics of large typical surface mine blasts. A detailed study of source and propagation features of conventional surface blasts is a prerequisite to attempts at discriminating this type of blasting activity from other sources of seismic events. The Black Thunder Seismic experiment is a joint verification effort to determine seismic source and path effects that result from very large, but routine ripple-fired surface mining blasts. Studies of the data collected will be for the purpose of understanding how the near-field and regional seismic waveforms from these surface mining blasts are similar to, and different from, point shot explosions and explosions at greater depth. The Black Hills Station is a Designated Seismic Station that was constructed for temporary occupancy by the Former Soviet Union seismic verification scientists in accordance with the Threshold Test Ban Treaty protocol.

Harben, P.E.; Glenn, L.A.

1995-10-01T23:59:59.000Z

26

Fish Hawk, Florida: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Hawk, Florida: Energy Resources Hawk, Florida: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 27.850582°, -82.2109229° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":27.850582,"lon":-82.2109229,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

27

Black Hawk County, Iowa: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Hawk County, Iowa: Energy Resources Hawk County, Iowa: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 42.447804°, -92.3813621° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":42.447804,"lon":-92.3813621,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

28

Knight Hawk adapts highwall mining for Southern Illinois  

SciTech Connect

A few years ago while planning their first underground operation and trying to decide how to mine shallow seams, Knight Hawk purchased a 'Superior Highwall Miner' (SHM). Since then this small innovative company has been pioneering the use of highwall mining in a trenching application in for example the Illinois Basin. Highwall mining is very suitable for contour mining in Appalachia. The article discusses the recent improvements and the advantages of SHM mining systems. 3 photos.

Buchsbaum, L.

2007-10-15T23:59:59.000Z

29

Evluation of an instrumented egg for monitoring heart rate of incubating hawks  

DOE Green Energy (OSTI)

An account is given of attempts to monitor hawks using an instrumented egg in the nest. Equipment problems, nest abandonments, and difficulties with extraneous noise are detailed. (MHR)

Gessaman, J.A.

1980-01-01T23:59:59.000Z

30

Trace anomaly and Hawking effect in 2D dilaton gravity theories  

E-Print Network (OSTI)

We investigate the classical and semiclassical features of generic 2D, matter-coupled, dilaton gravity theories. In particular, we show that the mass, the temperature and the flux of Hawking radiation associated with 2D black holes are invariant under dilaton-dependent Weyl rescalings of the metric. The relationship between quantum anomalies and Hawking radiation is discussed.

Mariano Cadoni

1996-12-16T23:59:59.000Z

31

Hawking-like radiation does not require a trapped region  

E-Print Network (OSTI)

We discuss the issue of quasi-particle production by ``analogue black holes'' with particular attention to the possibility of reproducing Hawking radiation in a laboratory. By constructing simple geometric acoustic models, we obtain a somewhat unexpected result: We show that in order to obtain a stationary and Planckian emission of quasi-particles, it is not necessary to create a trapped region in the acoustic spacetime (corresponding to a supersonic regime in the fluid flow). It is sufficient to set up a dynamically changing flow asymptotically approaching a sonic regime with sufficient rapidity in laboratory time.

Carlos Barcelo; Stefano Liberati; Sebastiano Sonego; Matt Visser

2006-07-03T23:59:59.000Z

32

Information loss and entropy conservation in quantum corrected Hawking radiation  

E-Print Network (OSTI)

It was found in [Phys.Lett.B 675 (2009) 98] that information is conserved in the process of black hole evaporation, by using the tunneling formulism and considering the correlations between emitted particles. In this Letter, we shall include quantum gravity effects, by taking into account of the log-area correction to Bekenstein-Hawking entropy. The correlation between successively emitted particles is calculated, with Planck-scale corrections. By considering the black hole evaporation process, entropy conservation is checked, and the existence of black hole remnant is emphasized. We conclue in this case information can leak out through the radiation and black hole evaporation is still a unitary process.

Yi-Xin Chen; Kai-Nan Shao

2009-05-07T23:59:59.000Z

33

Thermal Hawking Broadening and Statistical Entropy of Black Hole Wave Packet  

E-Print Network (OSTI)

The quantum mechanical structure of Schwarzschild black hole is probed, in the mini super spacetime, by means of a non-singular minimal uncertainty Hartle-Hawking wave packet. The Compton width of the microstate probability distribution is translated into a thermal Hawking broadening of the mass spectrum. The statistical entropy is analytically calculated using the Fowler prescription. While the exact Bekenstein-Hawking entropy is recovered at the semi classical limit, the accompanying logarithmic tail gives rise to a Planck size minimal entropy black wave packet.

Aharon Davidson; Ben Yellin

2013-06-27T23:59:59.000Z

34

Hawking Radiation from Squashed Kaluza-Klein Black Holes -- A Window to Extra Dimensions --  

E-Print Network (OSTI)

We explore the obsevability of extra dimensions through 5-dimensional squashed Kaluza-Klein black holes residing in the Kaluza-Klein spacetime. With the expectation that the Hawking radiation reflects the 5-dimensional nature of the squashed horizon, we study the Hawking radiation of a scalar field in the squashed black hole background. As a result, we show that the luminosity of Hawking radiation tells us the size of the extra dimension, namely, the squashed Kaluza-Klein black holes open a window to extra dimensions.

Hideki Ishihara; Jiro Soda

2007-02-22T23:59:59.000Z

35

Black Thunder Coal Mine and Los Alamos National Laboratory experimental study of seismic energy generated by large scale mine blasting  

SciTech Connect

In an attempt to better understand the impact that large mining shots will have on verifying compliance with the international, worldwide, Comprehensive Test Ban Treaty (CTBT, no nuclear explosion tests), a series of seismic and videographic experiments has been conducted during the past two years at the Black Thunder Coal Mine. Personnel from the mine and Los Alamos National Laboratory have cooperated closely to design and perform experiments to produce results with mutual benefit to both organizations. This paper summarizes the activities, highlighting the unique results of each. Topics which were covered in these experiments include: (1) synthesis of seismic, videographic, acoustic, and computer modeling data to improve understanding of shot performance and phenomenology; (2) development of computer generated visualizations of observed blasting techniques; (3) documentation of azimuthal variations in radiation of seismic energy from overburden casting shots; (4) identification of, as yet unexplained, out of sequence, simultaneous detonation in some shots using seismic and videographic techniques; (5) comparison of local (0.1 to 15 kilometer range) and regional (100 to 2,000 kilometer range) seismic measurements leading to determine of the relationship between local and regional seismic amplitude to explosive yield for overburden cast, coal bulking and single fired explosions; and (6) determination of the types of mining shots triggering the prototype International Monitoring System for the CTBT.

Martin, R.L.; Gross, D. [Thunder Basin Coal Co., Wright, WY (United States); Pearson, D.C.; Stump, B.W. [Los Alamos National Lab., NM (United States); Anderson, D.P. [Southern Methodist Univ., Dallas, TX (United States). Dept. of Geological Sciences

1996-12-31T23:59:59.000Z

36

Safety analysis of TCAS on Global Hawk using airspace encounter models  

E-Print Network (OSTI)

The U.S. Air Force's RQ-4 Global Hawk unmanned aerial vehicle (UAV) is a high altitude, long endurance aircraft used for surveillance and reconnaissance. Because of the potential for close proximity to manned aircraft in ...

Billingsley, Thomas B. (Thomas Boyd)

2006-01-01T23:59:59.000Z

37

Analogue Hawking Radiation in a dc-SQUID Array Transmission Line  

E-Print Network (OSTI)

We propose the use of a superconducting waveguide formed from an array of dc-SQUID's for investigating analogue Hawking radiation. Biasing the array with a space-time varying flux modifies the propagation velocity of the waveguide, leading to an effective metric with an horizon. Being a fundamentally quantum mechanical device, this setup allows for investigations of quantum effects such as back-reaction and analogue space-time fluctuations on the Hawking process.

P. D. Nation; M. P. Blencowe; A. J. Rimberg; E. Buks

2009-04-16T23:59:59.000Z

38

Red-tailed Hawk home range, habitat use, and activity patterns in north-central Puerto Rico.  

E-Print Network (OSTI)

??I determined abundance, movement and activity patterns of the Red-tailed Hawk (Buteo jamaicensis jamaicensis, RTHA) in Ro Abajo Forest, Puerto Rico and surrounding lands during (more)

Llerandi-Romn, Ivn C.

2006-01-01T23:59:59.000Z

39

Correlations in Hawking radiation and the infall problem  

E-Print Network (OSTI)

It is sometimes believed that small quantum gravity effects can encode information as `delicate correlations' in Hawking radiation, thus saving unitarity while maintaining a semiclassical horizon. A recently derived inequality showed that this belief is incorrect: one must have order unity corrections to low energy evolution at the horizon (i.e. fuzzballs) to remove entanglement between radiation and the hole. In this paper we take several models of `small corrections' and compute the entanglement entropy numerically; in each case this entanglement is seen to monotonically grow, in agreement with the general inequality. We also construct a model of `burning paper', where the entanglement is found to rise and then return to zero, in agreement with the general arguments of Page. We then note that the fuzzball structure of string microstates offers a version of `complementarity'. Low energy evolution is modified by order unity, resolving the information problem, while for high energy infalling modes ($E>> kT$) we may be able to replace correlators by their ensemble averaged values. Israel (and others) have suggested that this ensemble sum can be represented in the thermo-field-dynamics language as an entangled sum over two copies of the system, giving the two sides of the extended black hole diagram. Thus high energy correlators in a microstate may be approximated by correlators in a spacetime with horizons, with the ensemble sum over microstates acting like the `sewing' prescription of conformal field theory.

Samir D. Mathur; Christopher J. Plumberg

2011-01-25T23:59:59.000Z

40

Thermodynamics and Hawking radiation of five-dimensional rotating charged Goedel black holes  

SciTech Connect

We study the thermodynamics of Goedel-type rotating charged black holes in five-dimensional minimal supergravity. These black holes exhibit some peculiar features such as the presence of closed timelike curves and the absence of a globally spatial-like Cauchy surface. We explicitly compute their energies, angular momenta, and electric charges that are consistent with the first law of thermodynamics. Besides, we extend the covariant anomaly cancellation method, as well as the approach of the effective action, to derive their Hawking fluxes. Both the methods of the anomaly cancellation and the effective action give the same Hawking fluxes as those from the Planck distribution for blackbody radiation in the background of the charged rotating Goedel black holes. Our results further support that Hawking radiation is a quantum phenomenon arising at the event horizon.

Wu Shuangqing [College of Physical Science and Technology, HuaZhong Normal University, Wuhan, Hubei 430079 (China); Peng Junjin [College of Physical Science and Technology, HuaZhong Normal University, Wuhan, Hubei 430079 (China); College of Science, Wuhan Textile University, Wuhan, Hubei 430074 (China)

2011-02-15T23:59:59.000Z

Note: This page contains sample records for the topic "thunder hawk mc734" 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

Information conservation is fundamental: recovering the lost information in Hawking radiation  

E-Print Network (OSTI)

In both classical and quantum world, information cannot appear or disappear. This fundamental principle, however, is questioned for a black hole, by the acclaimed "information loss paradox". Based on the conservation laws of energy, charge, and angular momentum, we recently show the total information encoded in the correlations among Hawking radiations equals exactly to the same amount previously considered lost, assuming the non-thermal spectrum of Parikh and Wilczek. Thus the information loss paradox can be falsified through experiments by detecting correlations, for instance, through measuring the covariances of Hawking radiations from black holes, such as the manmade ones speculated to appear in LHC experiments. The affirmation of information conservation in Hawking radiation will shine new light on the unification of gravity with quantum mechanics.

Zhang, Baocheng; Zhan, Ming-sheng; You, Li

2013-01-01T23:59:59.000Z

42

A Status Report of Hawaiian Hawk Nesting Activities at the Proposed Well Site No. 2  

DOE Green Energy (OSTI)

On August 11, 1990 during an ornithological survey at the True/Mid Pacific Geothermal Venture proposed well site No.2, a Hawaiian hawk (Buteo solitarius) nest with a nestling was found approximately 430 feet from the proposed well pad clearing. The U.S. Fish and Wildlife Service and the State of Hawaii have listed the Hawaiian hawk as an endangered species. Future development in this area could be impacted by the presence of this endangered avian species and its nest in such close proximity to the proposed well site. This report summarizes the results of observations at the nest on August 12, 19 and 25 and September 2, 1990.

Jeffrey, Jack

1990-09-08T23:59:59.000Z

43

Trace anomaly and Hawking effect in generic 2D dilaton gravity theories  

E-Print Network (OSTI)

Black hole solutions in the context of a generic matter-coupled two-dimensional dilaton gravity theory are discussed both at the classical and semiclassical level. Starting from general assumptions, a criterion for the existence of black holes is given. The relationship between conformal anomaly and Hawking radiation is extended to a broad class of two-dimensional dilaton gravity models. A general and simple formula relating the magnitude of the Hawking effect to the dilaton potential evaluated on the horizon is derived.

Mariano Cadoni

1995-10-09T23:59:59.000Z

44

Landauer transport model for Hawking radiation from a Reissner-Nordstrom black hole  

E-Print Network (OSTI)

The recent work of Nation et al in which Hawking radiation energy and entropy flow from a black hole can be regarded as a one-dimensional (1D) Landauer transport process is extended to the case of a Reissner-Nordstrom (RN) black hole. It is found that the flow of charge current can also be transported via a 1D quantum channel except the current of Hawking radiation. The maximum entropy current, which is shown to be particle statistics independence, is also obtained.

Xiao-Xiong Zeng; Shi-Wei Zhou; Wen-Biao Liu

2011-06-03T23:59:59.000Z

45

Hawking radiation from a (4+n)-dimensional black hole: Exact results for the Schwarzschild phase.  

E-Print Network (OSTI)

ar X iv :h ep -p h/ 03 09 05 4v 2 5 N ov 2 00 3 Preprint typeset in JHEP style. - HYPER VERSION Cavendish-HEP-03/17 CERN-TH/2003-205 Hawking Radiation from a (4+n)-dimensional Black Hole: Exact Results for the Schwarzschild Phase C.M. Harrisa... conclude that both the amount and the type of radiation emitted can be used for the determination of n if the Hawking radiation from these black holes is observed. The emission of scalar modes in the bulk from the same black holes is also studied...

Harris, Chris M; Kanti, Panagiota

46

Quantum field theory in curved graphene spacetimes, Lobachevsky geometry, Weyl symmetry, Hawking effect, and all that  

E-Print Network (OSTI)

We extensively discuss the theoretical framework to make curved monolayer graphene a realization of quantum field theory in curved spacetime. We rely upon a model of the electron-phonon interaction that reproduces the standard semiclassical Dirac quantum field in a curved spacetime. This model holds for very long wavelengths of the graphene conductivity electrons involved. Provided the full description of the phonon-electron interaction is of a modified gravity-type, the core of the results presented here apply, with due changes, to that case too. Using local Weyl symmetry, we probe into the possibility to reproduce a Hawking effect. For the sake of making the test easier in a laboratory, the whole study is carried out for the case of purely spatial curvatures, and for conformally flat spacetimes. Since we show that for the sphere there is no intrinsic horizon, the focus is on the infinite different surfaces of constant negative Gaussian curvature. Even though, in those cases, deep reasons of Lobachevsky geometry seem to lead to unreachable event horizons, we show under which conditions the horizon is within reach. The Hawking effect, then, takes place on the Beltrami surface. We also explicitly study the spacetimes of the other two pseudospheres, and show their relation to de Sitter, and BTZ black-hole spacetimes. In the same limit that gives a reachable event horizon, these two cases, essentially, reduce to Beltrami. This, together with the fact that all the infinite surfaces in point are applicable to either one of the three pseudospheres, make us conjecture about the possibility for a Hawking effect for a generic surface of the family. The Hawking effect here manifests itself through a finite (Hawking) temperature electronic local density of states, that we exhibit.

Alfredo Iorio; Gaetano Lambiase

2013-08-01T23:59:59.000Z

47

High-Resolution Atmospheric Sensing of Multiple Atmospheric Variables Using the DataHawk Small Airborne Measurement System  

Science Conference Proceedings (OSTI)

The DataHawk small airborne measurement system provides in situ atmospheric measurement capabilities for documenting scales as small as 1 m and can access reasonably large volumes in and above the atmospheric boundary layer at low cost. The design ...

Dale A. Lawrence; Ben B. Balsley

2013-10-01T23:59:59.000Z

48

Hawking Non-thermal and Thermal Radiations of Schwarzschild Anti-de Sitter Black Hole by Hamilton-Jacobi method  

E-Print Network (OSTI)

The massive particles tunneling method has been used to investigate the Hawking non-thermal and purely thermal radiations of Schwarzschild Anti-de Sitter (SAdS) black hole. Considering the spacetime background to be dynamical, incorporate the self-gravitation effect of the emitted particles the imaginary part of the action has been derived from Hamilton-Jacobi equation. Using the conservation laws of energy and angular momentum we have showed that the non-thermal and purely thermal tunneling rates are related to the change of Bekenstein-Hawking entropy and the derived emission spectrum deviates from the pure thermal spectrum. The result obtained for SAdS black hole is also in accordance with Parikh and Wilczek\\rq s opinion and gives a correction to the Hawking radiation of SAdS black hole.

Rahman, M Atiqur

2013-01-01T23:59:59.000Z

49

Why does the Unruh effect rely on Lorentz invariance, while Hawking radiation does not ?  

E-Print Network (OSTI)

We show that without Lorentz invariance, the Unruh effect does not exist. We use modified dispersion relations and describe in turn: the non-thermal nature of the vacuum (defined in the preferred frame) restricted to the Rindler wedge, the loss of the KMS property of the Wigthman function, the transition amplitudes and transition rates of a uniformaly accelerated detector. This situation seems to contrast with the Hawking radiation of acoustic black holes, which under certain assumptions has been shown to be robust to a breaking of Lorentz symmetry. We explain this discrepancy.

Campo, David

2010-01-01T23:59:59.000Z

50

The Hawking Temperature in the context of Dark Energy for Reissner-Nordstrom background  

E-Print Network (OSTI)

Recently, it has been shown that the Hawking temperature is modified in the presence of dark energy \\cite{dg}. This was shown for an emergent gravity metric having $k-$essence scalar fields $\\phi$ with a Born-Infeld type lagrangian and with the gravitational metric as Schwarzschild. Here the gravitational metric is taken to be Reissner-Nordstrom (R-N) and the we consider the axisymmetric case $\\theta=0$. The corresponding Hawking temperatures of the two horizons are found to be T_+ = {\\hbar c^3 (1-\\dot\\phi_2^2)^2 \\over {2\\pi k_B}} {\\sqrt{G^2 M^2 - Q^2 (1-\\dot\\phi_2^2)} \\over {(GM + \\sqrt{G^2 M^2 - Q^2 (1-\\dot\\phi_2^2)})^2}}$ and $T_- = -{\\hbar c^3 (1-\\dot\\phi_2^2)^2 \\over {2\\pi k_B}} {\\sqrt{G^2 M^2 - Q^2 (1-\\dot\\phi_2^2)} \\over {(GM - \\sqrt{G^2 M^2-Q^2 (1-\\dot\\phi_2^2)})^2}}$ Here $\\dot\\phi_2^2$ is the kinetic energy of the $k-$essence field $\\phi$ and $k_{\\mathrm B}$ is the Boltzmann constant. In the axisymmetric scenario, the scalar field $\\phi(r,t)=\\phi_{1}(r)+\\phi_{2}(t)$ also satisfies the emergent gravity equations of motion.

Debashis Gangopadhyay; Goutam Manna

2013-03-12T23:59:59.000Z

51

High-Resolution Atmospheric Sensing of Multiple Atmospheric Variables Using the DataHawk Small Airborne Measurement System  

Science Conference Proceedings (OSTI)

The DataHawk small airborne measurement system provides in-situ atmospheric measurement capabilities for documenting scales as small as 1 m and can access reasonably large volumes in and above the atmospheric boundary layer at low cost. The design ...

Dale A. Lawrence; Ben B. Balsley

52

From Newton to Hawking and beyond: Why disability equality is relevant to the world of particle physics - by Dr T. Shakespeare  

E-Print Network (OSTI)

According to the recent World report on disability, 15% of the worlds population is disabled. Among that group could be numbered famous physicists such as Isaac Newton, Paul Dirac & Stephen Hawking. This presentation will provide some basic data about global disability, and the socially-imposed barriers which disabled people face.It will also offer some practical suggestions on how to respect and include people with disabilities in the workplace. Tom Shakespeare is a social scientist and ethicist with 25 years experience with the disability movement. Between 2008-2013, Tom worked in the Disability and Rehabilitation team at the World Health Organization, Geneva. He currently teaches medical sociology at the University of East Anglia Medical School, in Norwich, UK.

CERN. Geneva

2013-01-01T23:59:59.000Z

53

Surveys of distribution and abundance of the Hawaiian hawk within the vicinity of proposed geothermal project subzones in the District of Puna, Hawaii. Final report  

DOE Green Energy (OSTI)

In 1993, the US Fish and Wildlife Service (USFWS) entered an interagency agreement with the Department of Energy (DOE) to conduct specific biological surveys to identify potential impacts of proposed geothermal development on the biota of the east rift zone of Kilauea volcano in the Puna district on the island of Hawaii. This report presents data on the distribution, habitat use, and density of the Hawaiian hawk or `Io (Buteo solitarius). Data were collected by the USFWS to assess the potential impacts of geothermal development on `Io populations on the island of Hawaii. These impacts include degradation of potential nesting habitat and increased disturbance due to construction and operation activities. Data from these surveys were analyzed as part of an island wide population assessment conducted by the Western Foundation of Vertebrate Zoology at the request of the USFWS.

Reynolds, M.; Ritchotte, G.; Viggiano, A.; Dwyer, J.; Nielsen, B.; Jacobi, J.D. [Fish and Wildlife Service, Hawaii National Park, HI (United States). Hawaii Research Station

1994-08-01T23:59:59.000Z

54

Response of Red-Tailed Hawks and Golden Eagles to Topographical Features, Weather, and Abundance of a Dominant Prey Species at the Altamont Pass Wind Resource Area, California: April 1999-December 2000  

SciTech Connect

Studies have shown that raptors flying within the Altamont Pass WRA are vulnerable to fatal turbine collisions, possibly because of their specific foraging and flight behavior. Between June 1999 and June 2000, I conducted 346.5 hours of raptor observations within the Atlamont Pass WRA. Behavior was recorded in relation to characteristics of the topography (slope aspect, elevation, and inclination), the weather, and ground squirrel abundance, as determined by active burrow entrances. The most significant finding of this study revealed that red-tailed hawks and golden eagles flew more in strong winds than in weak winds, particularly along hillsides facing into prevailing winds (as opposed to hillsides shielded from the wind). This is likely a result of the birds' use of declivity currents for lift during flights. These results suggest that certain combinations of topography and weather produce wind currents that are sought out by foraging red-tailed hawks and golden eagles within the Altamont Pass WRA. To decrease raptor mortality, mitigation measures can be targeted to specific areas likely to attract foraging raptors because of their capacity to create particularly favorable wind currents.

Hoover, S.

2002-06-01T23:59:59.000Z

55

ThunderPower Bus Evaluation at SunLine Transit Agency  

E-Print Network (OSTI)

Source ............................. 30 Figure 2: Gasoline and CNG Prices by Gasoline Gallon Equivalent ................................................ 64 Figure 3: Diesel and CNG Prices by Diesel Gallon Equivalent ..................................................................... 102 Figure 5: Historical E85 Stations and E85 Sales Volume

56

Document Retrieval In OCR-Scanned Text David Hawking  

E-Print Network (OSTI)

names, foreign language words, esoteric technical terms and ar- chaic locutions. It has been observed [1

Hawking, David

57

Hawking radiation and total entropy change as tunneling  

E-Print Network (OSTI)

In the frame of Hamilton-Jacobi method, the back-reactions of the radiating particles together with the total entropy change of the whole system are investigated. The emission probability from this processing is found to be equivalent to the null geodesic method. However the total entropy of the system, particles and black hole, is increased yet very little, which is a little different. This method can be applied to any sort of horizons and particles without a specific choice of (regular-across-the-horizon) coordinates. Its physical meaning is more obvious: the negative energy one of a virtual particle pair is absorbed by the black hole, resulting in the temperature, electric potential and angular velocity increase; then the black hole amount of heat, electric charge and angular momentum can spontaneously transfer to the positive energy particle; when obtaining enough energy, it can escape away to infinity, visible to distant observers.

Ding, Chikun

2013-01-01T23:59:59.000Z

58

Hawking radiation and total entropy change as tunneling  

E-Print Network (OSTI)

In the frame of Hamilton-Jacobi method, the back-reactions of the radiating particles together with the total entropy change of the whole system are investigated. The emission probability from this process is found to be equivalent to the null geodesic method. However its physical picture is more clear: the negative energy one of a virtual particle pair is absorbed by the black hole, resulting in the temperature, electric potential and angular velocity increase; then the black hole amount of heat, electric charge and angular momentum can spontaneously transfer to the positive energy particle; when obtaining enough energy, it can escape away to infinity, visible to distant observers. And this method can be applied to any sort of horizons and particles without a specific choice of (regular-across-the-horizon) coordinates.

Chikun Ding

2013-02-02T23:59:59.000Z

59

Integrated Ferroelectrics, 71: 221232, 2005 Copyright Taylor & Francis Inc.  

E-Print Network (OSTI)

is higher than for the Thunder pieces, rendering the samples prone to depoling. The displacement loop

Mossi, Karla

60

Pure States, Mixed States and Hawking Problem in Generalized Quantum Mechanics  

E-Print Network (OSTI)

This paper is the continuation of a study into the information paradox problem started by the author in his earlier works. As previously, the key instrument is a deformed density matrix in quantum mechanics of the early universe. It is assumed that the latter represents quantum mechanics with fundamental length. It is demonstrated that the obtained results agree well with the canonical viewpoint that in the processes involving black holes pure states go to the mixed ones in the assumption that all measurements are performed by the observer in a well-known quantum mechanics. Also it is shown that high entropy for Planck remnants of black holes appearing in the assumption of the Generalized Uncertainty Relations may be explained within the scope of the density matrix entropy introduced by the author previously. It is noted that the suggested paradigm is consistent with the Holographic Principle. Because of this, a conjecture is made about the possibility for obtaining the Generalized Uncertainty Relations from the covariant entropy bound at high energies in the same way as R. Bousso has derived Heisenberg uncertainty principle for the flat space.

A. E. Shalyt-Margolin

2004-05-13T23:59:59.000Z

Note: This page contains sample records for the topic "thunder hawk mc734" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
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61

CHI-SQUARE TEST STATISTICS AND DERIVED MEASURES OF EFFECT FOR HAWKS, RAPTORS, AND ALL BIRDS  

E-Print Network (OSTI)

.31 1.22 6 Danwin 1 1.25 0.80 0 Flowind 4 9.96 0.40 -2 Windmatic 2 2.79 0.72 0 Enertech 4 12.66 0.32 -4 1.10 2.73 1 41.2 3 2.54 1.18 0 44.9 0 0.04 0 0 48.6 0 0.15 0 0 52.0 4 6.00 0.67 -1 Height (m ÷ Exp Accountable percent Turbine congestion (no. in 300 m) ** 0 - ­12 44 27.87 1.58 7 13 - ­24 102 109

62

Biology Index Page DSC Home Page DESERT STUDIES CENTER  

E-Print Network (OSTI)

Gadwall MW Green-winged Teal MW American Wigeon MW Northern Pintail MW Northern Shoveler MW Blue-winged* Bufflehead MW Red-breasted Merganser M* Hooded Merganser M* Ruddy Duck MW Partridges & Old World Quail's Hawk MW Red-shouldered Hawk M Red-tailed Hawk Y Swainson's Hawk M Rough-legged Hawk M Ferruginous Hawk

de Lijser, Peter

63

Research Highlight  

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

First Comes the Thunder: Precursors to Local Rainfall in the West African Monsoon Download a printable PDF Submitter: Roeder, L. R., Pacific Northwest National Laboratory Area of...

64

Automated extraction and classification of thunderstorm and ...  

Science Conference Proceedings (OSTI)

... found that thunder- storms dominated the wind climate in West Texas. ... may be unrealistically long, suggest- ing that intermediate beginning and ...

2013-01-17T23:59:59.000Z

65

www.victoria.ac.nz/atp/ After Post-Socialism: Social Theory, Utopia, and the Work  

E-Print Network (OSTI)

, 2004), pp. 23-47. Hawke, Gary, `New Zealand: Developing and Sustaining Economic Liberalisation', in Jim

Frean, Marcus

66

NATIONAL WEATHER SERVICE - Lightning Safety  

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

WEATHER SERVICE - Lightning Safety Lightning: What You Need to Know * NO PLACE outside is safe when thunderstorms are in the area * If you hear thunder, lightning is close enough...

67

Ruffed Grouse  

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

like distant thunder, and ends as a rapid whir. Every few minutes, for hours at a time, a cock performs day after day, and often spring after spring, on his favorite drumming spot...

68

Lake-Effect Snowstorms in Northern Utah and Western New York with and without Lightning  

Science Conference Proceedings (OSTI)

Lake-effect snowstorms in northern Utah and western New York with and without lightning/thunder are examined. Lake-effect snowstorms with lightning have significantly higher temperatures and dewpoints in the lower troposphere and significantly ...

David M. Schultz

1999-12-01T23:59:59.000Z

69

A Study of Tornadic Thunderstorm Interactions with Thermal Boundaries  

Science Conference Proceedings (OSTI)

It has been frequently observed that thunderstorms which interact with a warm front, or an old thunder-storm outflow boundary, are likely to increase in severity and become tornadic. The physical mechanisms responsible for this observed ...

Robert A. Maddox; L. Ray Hoxit; Charles F. Chappell

1980-03-01T23:59:59.000Z

70

Glossary Term - Thor  

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

Tantalus Previous Term (Tantalus) Glossary Main Index Next Term (Titans) Titans Thor In Norse mythology, Thor is the god of thunder and the son of Odin and Earth. Thor possesses a...

71

People's Physics Book Ch 11-1 The Big Idea  

E-Print Network (OSTI)

that the towers are equally spaced, and that the central support is equidistant from both middle towers. The best's say on a cool night (air temperature 10° Celsius) you see lightning flash and then hear the thunder

California at Santa Cruz, University of

72

NextPrevious | Home Logon Register Forums IT Talk Shop Chat Blogs Vendors Jobs  

E-Print Network (OSTI)

a very Future space robots may think for themselves amitsayal -7/7/2008 Add Comment Future space robots may think for themselves A spaceship descends with a thunderous roar and deposits a futuristic probe

Arizona, University of

73

Wyoming produces almost as much coal as the next seven states ...  

U.S. Energy Information Administration (EIA)

Black Thunder Mine led production with a total of 116.2 million short tons, followed by the North Antelope Rochelle Mine, with production of 105.8 million short tons.

74

Relations of Thunderstorms and Cloud-to-Ground Lightning Frequencies  

Science Conference Proceedings (OSTI)

Temporal and spatial relationships between thunderstorms (events) and flashes were investigated using data for 198385 for 25 first-order stations (10 in the West and 15 along the East Coast). Thunder events were compared with flashes within ...

Stanley A. Changnon Jr.

1989-08-01T23:59:59.000Z

75

Undulator-Based Laser Wakefield Accelerator Electron Beam Energy Spread and Emittance Diagnostic  

Science Conference Proceedings (OSTI)

The design and current status of experiments to couple the Tapered Hybrid Undulator (THUNDER) to the Lawrence Berkeley National Laboratory (LBNL) laser plasma accelerator (LPA) to measure electron beam energy spread and emittance are presented.

Bakeman, M.S.; Van Tilborg, J.; Nakamura, K.; Gonsalves, A.; Osterhoff, J.; Sokollik, T.; Lin, C.; Robinson, K.E.; Schroeder, C.B.; Toth, Cs.; Weingartner, R.; Gruner, F.; Esarey, E.; Leemans, W.P.

2010-06-01T23:59:59.000Z

76

The Thunderstorm Interactive Forecast System: Turning Automated Thunderstorm Tracks into Severe Weather Warnings  

Science Conference Proceedings (OSTI)

The Australian Bureau of Meteorology has developed a new tool called the Thunderstorm Interactive Forecast System (TIFS; formerly known as ThunderBox) for interactively producing finished severe weather warnings and other forecasts from ...

John Bally

2004-02-01T23:59:59.000Z

77

The Importance of Cloud Top Lifetime in the Description of Natural Cloud Characteristics  

Science Conference Proceedings (OSTI)

The microphysical and dynamical characteristics of 156 natural summer cumulus clouds have been documented for three locations in North America: Yellowknife, Northwest Territories; Thunder Bay, Ontario; and Miles City, Montana. The measurements (...

Robert S. Schemenauer; G. A. Isaac

1984-02-01T23:59:59.000Z

78

Bankruptcy Treatment of Intellectual Property Assets: An Economic Analysis  

E-Print Network (OSTI)

See Wing v. Comm'r of Internal Revenue, 278 F.2d 656, 661 (Fawick v. Comm'r of Internal Revenue, 436 F.2d 655, 662 (6thunder Article 9. The Internal Revenue Service later executed

Menell, Peter S.

2007-01-01T23:59:59.000Z

79

Common Name Scientific Name Double-crested Cormorant Phalacrocorax auritus  

E-Print Network (OSTI)

Green-winged Teal Anas crecca Hooded Merganser Lophodytes cucullatus Common Merganser Mergus merganser Accipter striatus Cooper's Hawk Accipiter cooperii Northern Harrier Circus cyaneus Broad-winged Hawk Buteo platypterus Red-tailed Hawk Buteo jamaicensis Bald Eagle Haliaeetus leucocephalus American Kestrel Falco

Sharp, Kim

80

EA-1603: Finding of No Significant Impact | Department of Energy  

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

Finding of No Significant Impact Finding of No Significant Impact EA-1603: Finding of No Significant Impact Expansion of Permitted Land and Operations at the 9940 Complex and Thunder Range at Sandia National Laboratories, Albuquerque, New Mexico The EA analyzes the potential effects of a proposal to increase testing and training activities and expansion of operations at the 9940 Complex and Thunder Range at Sandia National Laboratories, New Mexico. Expansion of Permitted Land and Operations at the 9940 Complex and Thunder Range at Sandia National Laboratories, New Mexico More Documents & Publications EA-1603: Final Environmental Assessment Federal Register Notice: National Nuclear Security Administration Site-Wide Environmental Impact Statement for Sandia National Laboratories, New Mexico

Note: This page contains sample records for the topic "thunder hawk mc734" from the National Library of EnergyBeta (NLEBeta).
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81

EA-1603: Final Environmental Assessment | Department of Energy  

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

Final Environmental Assessment Final Environmental Assessment EA-1603: Final Environmental Assessment Expansion of Permitted Land and Operations at the 9940 Complex and Thunder Range at Sandia National Laboratories, New Mexico Under the Proposed Action, the 9940 Complex and Thunder Range expansion would include approximately 1,680 acres of US Air Force-owned land located in the southwest corner of the Coyote Test Field, adjacent to TA-III. DOE/EA-1603: Final Environmental Assessment for the Expansion of Permitted Land and Operations at the 9940 Complex and Thunder Range at Sandia National Laboratories, New Mexico (April 2008) More Documents & Publications EIS-0281: Draft Environmental Impact Statement EIS-0281: Final Site-Wide Environmental Impact Statement EA-1603: Finding of No Significant Impact

82

NATIONAL WEATHER SERVICE - Lightning Safety  

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

NATIONAL WEATHER SERVICE - Lightning Safety Lightning: What You Need to Know * NO PLACE outside is safe when thunderstorms are in the area!! * If you hear thunder, lightning is close enough to strike you. * When you hear thunder, immediately move to safe shelter: a substantial building with electricity or plumbing or an enclosed, metal-topped vehicle with windows up. * Stay in safe shelter at least 30 minutes after you hear the last sound of thunder. Indoor Lightning Safety * Stay off corded phones, computers and other electrical equipment that put you in direct contact with electricity. * Avoid plumbing, including sinks, baths and faucets. * Stay away from windows and doors, and stay off porches. * Do not lie on concrete floors, and do not lean against concrete walls.

83

SAS Output  

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

Major U.S. Coal Mines, 2012" Major U.S. Coal Mines, 2012" "Rank","Mine Name / Company","Mine Type","State","Production (short tons)" 1,"North Antelope Rochelle Mine / Peabody Powder River Mining Ll","Surface","Wyoming",107639188 2,"Black Thunder / Thunder Basin Coal Company Llc","Surface","Wyoming",93082919 3,"Cordero Mine / Cordero Mining Llc","Surface","Wyoming",39204736 4,"Antelope Coal Mine / Antelope Coal Llc","Surface","Wyoming",34316314 5,"Belle Ayr Mine / Alpha Coal West, Inc.","Surface","Wyoming",24227846 6,"Eagle Butte Mine / Alpha Coal West, Inc.","Surface","Wyoming",22466733

84

Slide 1  

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

Detroit Edison's Advanced Implementation of A123's Community Energy Storage Systems for Grid Support (DE-OE0000229) Hawk Asgeirsson Principal Investigator November 3, 2010 Funded...

85

7 Technical Appendices Appendix A: Wildlife Species and Associated Habitat types in the Methow subbasin  

E-Print Network (OSTI)

Dipper Blue-winged Teal American Kestrel American Kestrel American Goldfinch Cinnamon Teal American Marten American Robin American Kestrel Swainson's Hawk American Robin Bank Swallow American Marten Red

86

Oxidation Modeling, Synthesis and Performance of Alumina ...  

Science Conference Proceedings (OSTI)

Oct 18, 2011... Duin2; Michael Gao1; Jeffrey Hawk3; 1National Energy Technology Lab - URS ; 2Penn State University; 3National Energy Technology Lab

87

Alloy Design and Phase Stability Modeling  

Science Conference Proceedings (OSTI)

Oct 19, 2011... De Nyago Tafen1; Michael Gao1; Jeffery Hawk2; 1National Energy Technology Lab; URS Coporation; 2National Energy Technology Lab

88

View  

E-Print Network (OSTI)

M? denotes the solar mass. which mimic the corresponding natural processes, ..... Gravitational radiation. In S. W. Hawking and W. Israel, editors,. 300 Years of...

89

Organic thin film prehistory: looking towards solution phase...  

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

Hawk Conference Room 108A Christopher Tassone, SSRL Polymer bulk heterojunction (BHJ) solar cells have attracted significant attention in industry and academia because of their...

90

Thunderstorms  

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

roofs, bare hillsides and cultivated fields on sunny days. It is these columns which eagles, hawks, and buzzards utilize to soar effortlessly. Glider pilots also use them and...

91

Animal species of concern reported from the Oak Ridge Reservation...  

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

heron NM Egretta thula snowy egret NM Ixobrychus exilis least bittern NM KITES, HAWKS, EAGLES, & allies Haliaeetus leucocephalus bald eagle d NM Circus cyaneus northern harrier NM...

92

Animal species of special concern reported from the Oak Ridge...  

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

NM Egretta caerulea little blue heron NM Egretta thula snowy egret NM KITES, HAWKS, EAGLES, & allies Haliaeetus leucocephalus bald eagle d NM Circus cyaneus northern harrier NM...

93

Table of Contents  

Science Conference Proceedings (OSTI)

Alternative to Sequestration.............................................................15. J. Hartvigsen, S . Elangovan, L. Frost, C. Stoots, J. O'Brien,. J. Herring, M. Sohal, and G. Hawkes.

94

Online Particle Physics Information - Specialized Subject Pages  

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

of relativity such as: cosmology, black holes, cosmic strings, inflation, and quantum gravity. Provides links to movies, research-level home pages and to Stephen Hawking's Web...

95

Probing surface chemistry using 'Operando' and 'Ultrafast' soft...  

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

Probing surface chemistry using 'Operando' and 'Ultrafast' soft x-ray spectroscopies Wednesday, December 18, 2013 - 3:00pm SLAC, Redtail Hawk Conference Room 108A Hirohito...

96

Organization Update Assistant Manager for Environmental Management  

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

EM-90 Office of the Manager Mark Whitney, Manager Sue Cange, Deputy Manager Brenda Hawks, Senior Technical Advisor Karen Ott, Chief of Staff Karen Forester, Administrative...

97

Electron acceleration & laser pulse compression using a laser...  

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

acceleration & laser pulse compression using a laser-plasma accelerator Wednesday, August 14, 2013 - 3:00pm SLAC, Redtail Hawk Conference Room 108A Andreas Walker, Oxford...

98

Mechanical Behavior of Tempered Martensitic Steels for ...  

Science Conference Proceedings (OSTI)

Presentation Title, Mechanical Behavior of Tempered Martensitic Steels for Ultrasupercritical Steam Applications. Author(s), Jeffrey A. Hawk, Paul D. Jablonski,...

99

NETL F 451.1-1/1 Categorical Exclusion (CX) Designation Form  

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

A. Hawk Aug. 2011 - Aug. 2014 NETL: Albany, OR Analytical Physics - Transmission Electron Microscopy (TEM) To characterize the microstructure and microchemistry of various...

100

LANL Institutes - Institute of Geophysics and Planetary Physics  

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

IGPPSLDRD Currently Funded Projects ASTRO First Science with the HAWK Gamma Ray Experiment Dark Matter Astrophysics New Neutrino Radiation Transport Methods for 3D Breakthrough...

Note: This page contains sample records for the topic "thunder hawk mc734" 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.
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101

SRNL - News Room  

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

cooperation, joint operations, unity of command, and the sharing of information and intelligence," Pendergist says. "SRNL already has a strong relationship with SeaHawk. The...

102

Fermilab Today | IIT University Profile  

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

Illinois Institute of Technology July 23, 2009 NAME: Illinois Institute of Technology HOME TOWN: Chicago MASCOT: Scarlet hawk SCHOOL COLORS: Scarlet and gray PARTICLE PHYSICS...

103

Advanced liquefaction using coal swelling and catalyst dispersion techniques. Volume 2, appendices. Final technical report, October 1, 1991--September 30, 1994  

Science Conference Proceedings (OSTI)

Liquefaction experiments were undertaken using subbituminous Black Thunder mine coal to observe the effects of aqueous SO{sub 2} coal beneficiation and the introduction of various coal swelling solvents and catalyst precursors. Aqueous SO{sub 2} beneficiation of Black Thunder coal removed alkali metals and alkaline earth metals, increased the sulfur content and increased the catalytic liquefaction conversion to THF solubles compared to untreated Black Thunder coal. The liquefaction solvent had varying effects on coal conversion, depending upon the type of solvent added. The hydrogen donor solvent, dihydroanthracene, was most effective, while a coal-derived Wilsonville solvent promoted more coal conversion than did relatively inert 1-methylnaphthalene. Swelling of coal with hydrogen bonding solvents tetrahydrofuran (THF), isopropanol, and methanol, prior to reaction resulted in increased noncatalytic conversion of both untreated and SO{sub 2} treated Black Thunder coals, while dimethylsulfoxide (DMSO), which was absorbed more into the coal than any other swelling solvent, was detrimental to coal conversion. Swelling of SO{sub 2} treated coal before liquefaction resulted in the highest coal conversions; however, the untreated coal showed the most improvements in catalytic reactions when swelled in either THF, isopropanol, or methanol prior to liquefaction. The aprotic solvent DMSO was detrimental to coal conversion.

Curtis, C.W. [Auburn Univ., AL (United States); Chander, S. [Pennsylvania State Univ., College Park, PA (United States); Gutterman, C.

1995-04-01T23:59:59.000Z

104

PRB rail loadings shatter record  

Science Conference Proceedings (OSTI)

Rail transport of coal in the Powder River Basin has expanded, with a record 2,197 trains loaded in a month. Arch Coal's Thunder basin mining complex has expanded by literally bridging the joint line railway. The dry fork mine has also celebrated its safety achievements. 4 photos.

Buchsbaum, L.

2008-09-15T23:59:59.000Z

105

Assessment of the Quality of Thunderstorm Data at First-Order Stations  

Science Conference Proceedings (OSTI)

Climatological assessments of past fluctuations in thunderstorms and other weather extremes require high-quality records. Data on thunder-day occurrences exist at U.S. first-order stations (FOS) since 1894 and represent the only long-term data ...

Stanley A. Changnon

2001-04-01T23:59:59.000Z

106

Pingin' in the rain  

Science Conference Proceedings (OSTI)

Residential Internet connections are susceptible to weather-caused outages: Lightning and wind cause local power failures, direct lightning strikes destroy equipment, and water in the atmosphere degrades satellite links. Outages caused by severe events ... Keywords: ThunderPing, outage, ping, weather

Aaron Schulman; Neil Spring

2011-11-01T23:59:59.000Z

107

Revised 12/2012 JULIA M. WONDOLLECK  

E-Print Network (OSTI)

, 1987; updated 2002 and 2012. "Designing a Collaborative Process: The Proposed Thunder Bay National. Contributor, NEPA Pilot Projects Initiative, US Institute for Environmental Conflict Resolution and the Udall Assessment Group: A Case Study of a Large-Scale Data Negotiation." 2000. Sumrall, Kristin. "Confronting

Edwards, Paul N.

108

Entertainment Tech & science  

E-Print Network (OSTI)

Science Space Gadgets Internet Wireless Security Games Innovation Travel Weather Local news Browse Video Meet the Press MSNBC TV NBC Sports search site web Future space robots may think for themselves:13 a.m. PT, Sat., July. 5, 2008 A spaceship descends with a thunderous roar and deposits a futuristic

Arizona, University of

109

FOCUSFOCUSCollege of Engineering and Physical Sciences February 2004, VOL. 24, NO. 2 SUPPORT THE KINGSBURY RENOVATION PROJECT  

E-Print Network (OSTI)

of modern, usable space. The state legislature provided $44.6 million for the project two years ago and UNH in nearby Parsons, and Dean Arthur Greenberg jokingly likened the thunderous roar to the opening salvos and the library storage space on Leavitt Lane, but everything that was available before the move is still

Pohl, Karsten

110

Remember Me No account?  

E-Print Network (OSTI)

A spaceship descends with a thunderous roar and deposits a futuristic probe before taking off again, ... Pasadena (California, United States) Artificial Intelligence & Robotics, Astronomy & Space Science, Physics hours ago - AeroMorning] Entities: Payload, The Boeing Company, Means of Transport, Space Tourism First

Arizona, University of

111

Relationships between Thunderstorms and Cloud-to-Ground Lightning in the United States  

Science Conference Proceedings (OSTI)

Data from networks of lightning sensors operated during 1986?89 were employed to perform climatic assessments of cloud-to-ground (CG) flashes, and of the relationship between CG flashes and thunder events, as reported at 62 first-order stations. ...

Stanley A. Changnon

1993-01-01T23:59:59.000Z

112

RESERVOIR INFLOW FORECASTING USING NEURAL NETWORKS CHANDRASHEKAR SUBRAMANIAN  

E-Print Network (OSTI)

or over predicting electricity demand due to poor weather forecasts is several hundred million dollars outages that many in the area experienced. Deep Thunder can also improve generation-side load forecasting by providing high-resolution weather forecast data for use in electricity demand forecast models. Integrating

Manry, Michael

113

Design and development of an automated acoustic based jet engine performance evaluator  

Science Conference Proceedings (OSTI)

Aircraft jet engines produce loud thundering sound that is caused due to high rate of fuel-air combustion. However due to improper combustion caused by non proportional air-fuel ratios, malfunction of fuel feed or any other loose gauging, certain abnormal ...

Atif Bin Mansoor; Hammad Ahmed; Z. Mahmood

2009-02-01T23:59:59.000Z

114

A Winter Mesocyclone over the Midwestern United States  

Science Conference Proceedings (OSTI)

A diagonostic analysis is made of a midwinter mesoscale vortex that developed over the Mississippi Valley and produced moderate to heavy snow with gale force winds (>18 m s?1), lightning, and thunder along a narrow track approximately 1500 km in ...

Boniface J. Mils; John E. Walsh

1988-09-01T23:59:59.000Z

115

Quantum corrections for a black hole in an asymptotically safe gravity with higher derivatives  

E-Print Network (OSTI)

By using the quantum tunneling approach over semiclassical approximations, we study the quantum corrections to the Hawking temperature, entropy and Bekenstein-Hawking entropy-area relation for a black hole in an asymptotically safe gravity with higher derivatives. The leading and non leading corrections to the area law are obtained.

Mubasher Jamil; Farhad Darabi

2011-10-29T23:59:59.000Z

116

5/18/2012 Rare Vertebrates of Kansas Kansas Natural Heritage Inventory  

E-Print Network (OSTI)

Eastern Newt Threatened G5 S2 Anaxyrus debilis Green Toad Threatened G5 S2 Anaxyrus punctatus Red1B,S4N Buteo platypterus Broad-winged Hawk G5 S1B Buteo regalis Ferruginous Hawk SINC G4 S2B,S4N

Peterson, Blake R.

117

Bird Checklist for the East Coast Seen Common Name Latin Name Seen Common Name Latin Name  

E-Print Network (OSTI)

herodias Red-shouldered Hawk Buteo lineatus Great Egret Casmerodius albus Broad-winged Hawk ButeoBird Checklist for the East Coast 1 Seen Common Name Latin Name Seen Common Name Latin Name Red-throated Loon Gavia stellata Common Scoter Melanitta nigra Pacific Loon Gavia pacifica White-winged Scoter

Sharp, Kim

118

7/19/2012 Rare Vertebrates of Kansas Kansas Natural Heritage Inventory  

E-Print Network (OSTI)

Eastern Newt Threatened G5 S2 Anaxyrus debilis Green Toad Threatened G5 S2 Anaxyrus punctatus Red1B,S4N Buteo platypterus Broad-winged Hawk G5 S1B Buteo regalis Ferruginous Hawk SINC G4 S2B,S4N

Peterson, Blake R.

119

Publications: Refereed Journal Publications  

E-Print Network (OSTI)

, John T. Morrison, Vladimir M. Ovchinnikov, Dustin Offermann, Linn Van Woerkom and Richard Freeman, John. Hawkes, C. Hernandez-Gomez, H. Habara, R. Heathcote, D.S. Hey, K. Highbarger, M.H. Key, R. Kodama, K. Clark, R.R. Freeman, S.Hawkes, C. Hernandez-Gomez, H. Habara, R. Heathcote, D.S. Hey, K. Highbarger, M

Krstic, Miroslav

120

SEAS Common Reading Experience Monday, August 22, 2011 11:00 p.m -12:30 pm  

E-Print Network (OSTI)

, John T. Morrison, Vladimir M. Ovchinnikov, Dustin Offermann, Linn Van Woerkom and Richard Freeman, John. Hawkes, C. Hernandez-Gomez, H. Habara, R. Heathcote, D.S. Hey, K. Highbarger, M.H. Key, R. Kodama, K. Clark, R.R. Freeman, S.Hawkes, C. Hernandez-Gomez, H. Habara, R. Heathcote, D.S. Hey, K. Highbarger, M

Acton, Scott

Note: This page contains sample records for the topic "thunder hawk mc734" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
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121

Correlation loss and multipartite entanglement across a black hole horizon  

Science Conference Proceedings (OSTI)

We investigate the Hawking effect on entangled fields. By considering a scalar field which is in a two-mode squeezed state from the point of view of freely falling (Kruskal) observers crossing the horizon of a Schwarzschild black hole, we study the degradation ... Keywords: Hawking-Unruh effect, Schwarzschild black holes, continuous variable correlations, multipartite entanglement

Gerardo Adesso; Ivette Fuentes-Schuller

2009-07-01T23:59:59.000Z

122

Frostbite Theater - Static Electricity Experiments - Opposites Attract and  

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

Behind the Scenes Behind the Scenes Previous Video (Behind the Scenes) Frostbite Theater Main Index Next Video (Thunder and Lightning) Thunder and Lightning Opposites Attract and Likes Repel An electroscope can be used to show that opposite electric charges attract and like electric charges repel. [ Show Transcript ] Announcer: Frostbite Theater presents... Cold Cuts! No baloney! Joanna and Steve: Just science! Joanna: Hi! I'm Joanna! Steve: And I'm Steve! Joanna: I'm sure you all know that opposite charges attract and like charges repel, but have you ever seen it? If not, we can show you with these things! Steve: These devices are called electroscopes. They're made from a little clippy thing and two pieces of plastic. If Joanna and I take our fingers and scrape them against the plastic

123

Wildlife-Salmonid Relationships Table F1. Wildlife species in the Yakima subbasin, Washington that eat  

E-Print Network (OSTI)

Rare Incubation - eggs and alevin Rare Carcasses Green-winged Teal Anas crecca Rare Incubation - eggs Indirect Incubation - eggs and alevin Red-tailed Hawk Buteo jamaicensis Rare Carcasses Golden Eagle Aquila

124

Understanding the Relationships between Lightning, Cloud Microphysics, and Airborne Radar-Derived Storm Structure during Hurricane Karl (2010)  

Science Conference Proceedings (OSTI)

This study explores relationships between lightning, cloud microphysics, and tropical cyclone (TC) storm structure in Hurricane Karl (16 September 2010) using data collected by the NASA DC-8 and Global Hawk (GH) aircraft during NASAs Genesis and ...

Brad Reinhart; Henry Fuelberg; Richard Blakeslee; Douglas Mach; Andrew Heymsfield; Aaron Bansemer; Stephen L. Durden; Simone Tanelli; Gerald Heymsfield; Bjorn Lambrigtsen

125

Birds' Nests  

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

are pressed into place and reinforced with blades of dead grass. With the exception of eagles and certain hawks it is one of the few birds that uses the same nest more than one...

126

Bird Beaks and Feet  

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

a bird gives a good clue to its feeding habits. Carnivorous birds like hawks, owls and eagles have strong hooked beaks for tearing flesh. Herons, egrets and kingfishers, with their...

127

Eyes of Animals  

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

"simple" eyes for close vision. Birds have the keenest eyes and those of the hawks, eagles and vultures can see small objects at incredible distances. By their eyes ye shall...

128

Fermilab Today  

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

is not doom and gloom, though. Several predatory birds, such as Cooper's hawks, bald eagles, peregrine falcons and ospreys, seem to be making a comeback at Fermilab. This is...

129

Large Owls  

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

"ear" tufts. The nest is usually a remodeled hawk or owl's nest, but they even drive eagles from their eyries and take over. The food is extremely varied; mostly mice, rabbits...

130

Microsoft Word - nrel_ea_master_5_21_07.doc  

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

Swainson's hawk migrate thousands of miles each year, 25 wintering as far south as Argentina and returning to the western United States and Canada to breed. Areas 26 such as the...

131

Commissioning the New LCLS X-Band Transverse Deflecting Cavity...  

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

Commissioning the New LCLS X-Band Transverse Deflecting Cavity with Femtosecond Resolution Wednesday, July 31, 2013 - 3:00pm SLAC, Redtail Hawk Conference Room 108A Yuantao Ding...

132

Quantum gravity on the lattice  

E-Print Network (OSTI)

the Conference Quantum Gravity: Challenges and Perspectives.divergences in quantum gravity. In: Hawking, S.W. , Israel,f ) V n?1 ( f ) = Quantum gravity on the lattice Similarly,

Hamber, Herbert W.

2009-01-01T23:59:59.000Z

133

Towards experimentally testing the paradox of black hole information loss  

E-Print Network (OSTI)

Information about the collapsed matter in a black hole will be lost if Hawking radiations are truly thermal. Recent studies discover that information can be transmitted from a black hole by Hawking radiations, due to their spectrum deviating from exact thermality when back reaction is considered. In this paper, we focus on the spectroscopic features of Hawking radiation from a Schwarzschild black hole, contrasting the differences between the nonthermal and thermal spectra. Of great interest, we find that the energy covariances of Hawking radiations for the thermal spectrum are exactly zero, while the energy covariances are non-trivial for the nonthermal spectrum. Consequently, the nonthermal spectrum can be distinguished from the thermal one by counting the energy covariances of successive emissions, which provides an avenue towards experimentally testing the long-standing "information loss paradox".

Zhang, Baocheng; Zhan, Ming-sheng; You, Li; 10.1103/PhysRevD.87.044006

2013-01-01T23:59:59.000Z

134

Observation of Dynamic Phenomena of Laser Peening with XFEL at...  

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

Dynamic Phenomena of Laser Peening with XFEL at SACLA Wednesday, July 17, 2013 - 3:00pm SLAC, Redtail Hawk Conference Room 108A Speaker: Yuji Sano, Toshiba Program Description...

135

A 1-mW vibration energy harvesting system for moth flight-control applications  

E-Print Network (OSTI)

This thesis focuses on the approach and methodologies required to build a 1-mW energy-harvesting system for moth flight control applications. The crepuscular hawk moth Manduca sexta is the chosen test subject. This project ...

Chang, Samuel C

2010-01-01T23:59:59.000Z

136

Slide 1  

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

Carol Hawk Program Manager U.S. Department of Energy Cybersecurity for Energy Delivery Systems July 20, 2010 2 Roadmap Vision In 10 years, control systems for critical applications...

137

Wilson BIlII 94(1). 1982. pp. 46-54 BREEDING BIOLOGY AND DIET OF THE FERRUGINOUS  

E-Print Network (OSTI)

began the day the first hawk was sighted. Active nests were located either during aerial surveys (1973) in Colorado, Howard (1975) in Utah and Idaho, and Lokemoen and Duebbert (1976) in north

138

Los Alamos National Laboratory  

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

Space Science Hawk Jodie Assessing the Validity of Magnetic Field Model TS05 with Geomagnetic Storm Data Earth and Space Science Hudak Michael X-Ray Reflectivity and Diffraction...

139

Individual differences and system development  

Science Conference Proceedings (OSTI)

Using an order of magnitude more subjects, this replication of a study by Dos Santos and Hawk confirms its finding that system development professionals' attitudes can be classified as user-oriented, technically-oriented, or socio-politically-oriented. ...

James J. Jiang; Gary Stephen Klein; Roger Alan Pick

1996-07-01T23:59:59.000Z

140

Micromechanical actuators for insect flight mechanics  

E-Print Network (OSTI)

This project aims to develop MEMS actuators to aid in the study of insect flight mechanics. Specifically, we are developing actuators that can stimulate the antennae of the crepuscular hawk moth Manduca Sexta. The possible ...

Zhou, Hui, M.S. Massachusetts Institute of Technology

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "thunder hawk mc734" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

4D-HD for high energy density plasmas: shedding light into rapidly...  

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

D-HD for high energy density plasmas: shedding light into rapidly changing, opaque plasmas Wednesday, July 24, 2013 - 3:00pm SLAC, Redtail Hawk Conference Room 108A Marta Fajardo,...

142

Two-Color Self-Seeding at LCLS | Stanford Synchrotron Radiation...  

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

Two-Color Self-Seeding at LCLS Wednesday, September 18, 2013 - 3:00pm SLAC, Redtail Hawk Conference Room 108A Franz-Josef Decker, Accelerator Directorate The Linac Coherent Light...

143

Flycatchers  

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

a crow, a hawk, or even an eagle. We saw one, with its nest in an apple tree, attack a dog and, another time, the hat of a man passing underneath. The Eastern Phoebe has almost...

144

What the latest discoveries tell us about the Big Bang, dark matter and multiple universes  

E-Print Network (OSTI)

The intriguing science behind moral judgements WHAT MAKES US DISGUSTED? Stephen Hawking New film: the verdict) of your bowl movements, is stuck with the Bluetooth pin 0000, making it an easy target. BLUETOOTH TOILETS

Bechtel, William

145

3D/4D/5D visualization of material at nano-scale using Transmission...  

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

3D4D5D visualization of material at nano-scale using Transmission X-ray Microscopy Wednesday, May 22, 2013 - 3:00pm SLAC, Redtail Hawk Conference Room 108A Yijin Liu, SSRL The...

146

Sustainable Energy Materials Research at SSRL | Stanford Synchrotron...  

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

Redtail Hawk Conference Room 108A Speaker: Mike Toney, SSRL The development of a carbon free economy Is probably the greatest challenge facing humanity in the coming decades. This...

147

Alloy Design and Phase Stability Modeling  

Science Conference Proceedings (OSTI)

Oct 20, 2010... in MX Carbide/Nitride and the Z-Phase: A First Principles Approach: Michael Gao1; Chris Cowen1; Paul Jablonski1; Jeff Hawk1; 1NETL

148

main_title.html  

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

Bird Nests Buffalo Canada Geese Deer Fungi Grass Insects Lichens Math Patterns in Nature Poison Ivy Prairie Insects in Winter Red-tailed Hawk West Nile Virus Woodchuck Prairie...

149

Advanced direct liquefaction concepts for PETC generic units. Quarterly technical progress report, October 1992--December 1992  

DOE Green Energy (OSTI)

The reactivity of the THF insoluble fraction of the ashy resid component of Wilsonville recycle oil (WRO) during liquefaction of Black Thunder coal in tetralin was determined at 415{degrees}C and 60 minutes. The liquefaction runs were made by combining this material with Black Thunder coal at the same ratio used in the WRO coal runs. THF conversion and product distribution from liquefaction in tetralin in the presence of the THF insoluble fraction of the ashy resid were similar to results from liquefaction in WRO. THF conversion was greater than loot with an oil yield that was somewhat higher than in WRO. Differences in HC gas yield and H{sub 2} consumption were slight, while conversion and product distribution from liquefaction of Black Thunder coal in tetralin or in the WRO distillate were quite different. In both these solvents the 85--86% THF conversions were less than for runs in which the THF insoluble fraction of the ashy resid was present. This establishes that the THF insoluble fraction of the ashy resid is the reactive fraction of the WRO.

Not Available

1993-02-01T23:59:59.000Z

150

Thermodynamics of Schwarzschild-de Sitter black hole: thermal stability of Nariai black hole  

E-Print Network (OSTI)

We study thermodynamics of the Schwarzschild-de Sitter black hole in five dimensions by introducing two temperatures based on the standard and Bousso-Hawking normalizations. We use the first-law of thermodynamics to derive thermodynamic quantities. The two temperatures indicate that the Nariai black hole is thermodynamically unstable. However, it seems that black hole thermodynamics favors the standard normalization, and does not favor the Bousso-Hawking normalization.

Yun Soo Myung

2007-12-20T23:59:59.000Z

151

Thermodynamics of Schwarzschild-de Sitter black hole: thermal stability of Nariai black hole  

E-Print Network (OSTI)

We study thermodynamics of the Schwarzschild-de Sitter black hole in five dimensions by introducing two temperatures based on the standard and Bousso-Hawking normalization. We use the first-law of thermodynamics to derive thermodynamic quantities. The two temperatures indicate that the Nariai black hole is thermodynamically unstable. However, it seems that black hole thermodynamics favors the standard normalization and disfavors the Bousso-Hawking normalization.

Myung, Yun Soo

2007-01-01T23:59:59.000Z

152

Black Funnels  

E-Print Network (OSTI)

The Hartle-Hawking state of $\\mathcal{N}=4$ SYM at strong coupling and large $N$ on a fixed black hole background has two proposed gravitational duals: a black funnel or a black droplet. We construct the black funnel solutions that are dual to the Hartle-Hawking state on a Schwarzschild black hole and on a class of three-dimensional asymptotically flat black hole backgrounds. We compute their holographic stress tensor and argue for the stability of these solutions.

Santos, Jorge E

2012-01-01T23:59:59.000Z

153

Black Funnels  

E-Print Network (OSTI)

The Hartle-Hawking state of $\\mathcal{N}=4$ SYM at strong coupling and large $N$ on a fixed black hole background has two proposed gravitational duals: a black funnel or a black droplet. We construct the black funnel solutions that are dual to the Hartle-Hawking state on a Schwarzschild black hole and on a class of three-dimensional asymptotically flat black hole backgrounds. We compute their holographic stress tensor and argue for the stability of these solutions.

Jorge E. Santos; Benson Way

2012-08-30T23:59:59.000Z

154

Bounding the Greybody Factors for Non-rotating Black Holes  

E-Print Network (OSTI)

Semiclassical black holes emit radiation called Hawking radiation. Such radiation, as seen by an asymptotic observer far outside the black hole, differs from original radiation near the horizon of the black hole by a redshift factor and the so-called "greybody factor". In this paper, we concentrate on the greybody factor-various bounds for the greybody factors of non-rotating black holes are obtained, concentrating on charged Reissner-Nordstrom and Reissner-Nordstrom-de Sitter black holes. These bounds can be derived by using a 2x2 transfer matrix formalism. It is found that the charges of black holes act as efficient barriers. Furthermore, adding extra dimensions to spacetime can shield Hawking radiation. Finally, the cosmological constant can increase the emission rate of Hawking radiation.

Tritos Ngampitipan; Petarpa Boonserm

2012-11-17T23:59:59.000Z

155

Quantum information cannot be completely hidden in correlations: implications for the black-hole information paradox  

E-Print Network (OSTI)

The black-hole information paradox has fueled a fascinating effort to reconcile the predictions of general relativity and those of quantum mechanics. Gravitational considerations teach us that black holes must trap everything that falls into them. Quantum mechanically the mass of a black hole leaks away as featureless (Hawking) radiation, but if the black hole vanishes, where is the information about the matter that made it? We treat the states of the in-fallen matter quantum mechanically and show that the black-hole information paradox becomes more severe. Our formulation of the paradox rules out one of the most conservative resolutions: that the state of the in-falling matter might be hidden in correlations between semi-classical Hawking radiation and the internal states of the black hole. As a consequence, either unitarity or Hawking's semi-classical predictions must break down. Any resolution of the black-hole information crisis must elucidate one of these possibilities.

Samuel L. Braunstein; Arun K. Pati

2006-03-13T23:59:59.000Z

156

USDOE/EPRI BIOMASS COFIRING COOPERATIVE AGREEMENT  

DOE Green Energy (OSTI)

During the period of April 1, 2000 through June 30, 2000, alternatives for relocating the Seward Generating Station cofiring project were investigated. A test was conducted at Bailly Generating Station of Northern Indiana Public Service Co., firing a blend of Black Thunder (Powder River Basin) coal and Illinois basin coal, in cyclone boiler designed for Illinois basin coal. This test at Bailly was designed to determine the technical feasibility of cofiring at that station using PRB coals. This report summarizes the activities during the second calendar quarter in 2000 of the USDOE/EPRI Biomass Cofiring Cooperative Agreement. It focuses upon reporting the results of construction and testing activities at these generating stations.

E. Hughes; D. Tillman

2000-07-01T23:59:59.000Z

157

Slide 1  

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

Carol Hawk Carol Hawk Program Manager U.S. Department of Energy Cybersecurity for Energy Delivery Systems July 20, 2010 2 Roadmap Vision In 10 years, control systems for critical applications will be designed, installed, operated, and maintained to survive an intentional cyber assault with no loss of critical function. * Published in January 2006 * Energy Sector's synthesis of critical control system security challenges, R&D needs, and implementation milestones * Provides strategic framework to - align activities to sector needs - coordinate public and private programs - stimulate investments in control systems security Roadmap - Framework for Public-Private Collaboration Roadmap Strategies Develop and Integrate Protective Measures

158

NETL-RUA  

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

65 65 Annual Review FY2012 Name Affiliation Title Gemmen, Randall NETL Division Director (DD) Hawk, Jeffrey NETL Materials Research Engineer Holcomb, Gordon NETL Materials Research Engineer Jablonski, Paul NETL Metallurgist Robey, Edward URS Contractor Project Lead Argetsinger, Edward URS Engineering Technician Burkey, Edward URS Engineering Technician Name Affiliation Role University Project Title Seetharaman, Sridhar Zhu, Jingxi CMU PI Grad Student Fundamental Examination of Deposit Compositions Associated with Fireside Corrosion Meier, Gerald Yanar, Nazik Lutz, Michael Pitt PI Co-PI Grad Student Fundamental Examination of Deposit Compositions Associated with Fireside Corrosion ADVANCED COMBUSTION NETL Federal Project Manager: Randy Gemmen NETL Team Technical Coordinator: Jeff Hawk Appendix A:

159

Enhanced Black Hole Horizon Fluctuations  

E-Print Network (OSTI)

We discuss the possible role of quantum horizon fluctuations on black hole radiance, especially whether they can invalidate Hawking's analysis based upon transplanckian modes. We are particularly concerned with ``enhanced'' fluctuations produced by gravitons or matter fields in squeezed vacuum states sent into the black hole after the collapse process. This allows for the possibility of increasing the fluctuations well above the vacuum level. We find that these enhanced fluctuations could significantly alter stimulated emission but have little effect upon the spontaneous emission. Thus the thermal character of the Hawking radiation is remarkably robust.

R. T. Thompson; L. H. Ford

2008-03-13T23:59:59.000Z

160

Schwarzschild-de Sitter black hole from entropic viewpoint  

E-Print Network (OSTI)

In a Schwarzschild-de Sitter space, we consider an equipotential surface which consists of two holographic screens. Adapting the Bousso-Hawking's reference point of vanishing force, we divide the space into two regions, which are from the reference point to each holographic screen. These two regions can be treated as independent thermodynamical systems, because the Bousso-Hawking reference point with zero temperature behaves like a thermally insulating wall. The entropy obtained in this way agrees with the conventional results; i) when the holographic screens lie at the black hole and cosmological horizons, ii) in the Nariai limit.

Ee Chang-Young; Myungseok Eune; Kyoungtae Kimm; Daeho Lee

2010-11-17T23:59:59.000Z

Note: This page contains sample records for the topic "thunder hawk mc734" 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

Chemistry of Chern-Simons Supergravity: reduction to a BPS kink, oxidation to M-theory and thermodynamical aspects  

E-Print Network (OSTI)

We construct a supersymmetric extension of the two dimensional Kaluza-Klein-reduced gravitational Chern-Simons term, and globally study its solutions, labelled by mass and U(1) charge c. The kink solution is BPS, and in an appropriate conformal frame all solutions asymptotically approach AdS. The thermodynamics of the Hawking effect yields interesting behavior for the specific heat and hints at a Hawking-Page-like transition at T_{critical} \\sim c^{3/2}. We address implications for higher dimensions ("oxidation"), in particular D=3,4 and 11, and comment briefly on AdS/CFT aspects of the kink.

L. Bergamin; D. Grumiller; A. Iorio; C. Nunez

2004-09-27T23:59:59.000Z

162

Thermodynamics of 5D dilaton-gravity  

Science Conference Proceedings (OSTI)

We calculate the free energy, spatial string tension and Polyakov loop of the gluon plasma using the dilaton potential of Ref. [1] in the dilaton-gravity theory of AdS/QCD. The free energy is computed from the Black Hole solutions of the Einstein equations in two ways: first, from the Bekenstein-Hawking proportionality of the entropy with the area of the horizon, and secondly from the Page-Hawking computation of the free energy. The finite temperature behaviour of the spatial string tension and Polyakov loop follow from the corresponding string theory in AdS{sub 5}. Comparison with lattice data is made.

Megias, E. [Institute for Theoretical Physics, University of Heidelberg (Germany); Instituto de Fisica Teorica CSIC-UAM, Universidad Autonoma de Madrid (Spain)

2011-05-23T23:59:59.000Z

163

Some remarks on black hole thermodynamics  

E-Print Network (OSTI)

Two thermodynamic "paradoxes" of black hole physics are re-examined. The first is that there is a thermal instability involving two coupled blackbody cavities containing two black holes, and second is that a classical black hole can swallow up entropy in the form of ambient blackbody photons without increasing its mass. The resolution of the second paradox by Bekenstein and by Hawking is re-visited. The link between Hawking radiation and Wigner's superluminal tunneling time is discussed using two equivalent Feynman diagrams, and Feynman's re-interpretation principle.

R. Y. Chiao

2010-12-27T23:59:59.000Z

164

Partition Function of the Reissner-Nordstrm Black Hole  

E-Print Network (OSTI)

We consider a microscopic model of a stretched horizon of the Reissner-Nordstr\\"om black hole. In our model the stretched horizon consists of discrete constituents. Using our model we obtain an explicit, analytic expression for the partition function of the hole. Our partition function implies, among other things, the Hawking effect, and provides it with a microscopic explanation as a phase transition taking place at the stretched horizon. The partition function also implies the Bekenstein-Hawking entropy law. The model and its consequences are similar to those obtained previously for the Schwarzschild black hole.

Jarmo Makela

2012-12-05T23:59:59.000Z

165

Partition Function of the Reissner-Nordstr\\"om Black Hole  

E-Print Network (OSTI)

We consider a microscopic model of a stretched horizon of the Reissner-Nordstr\\"om black hole. In our model the stretched horizon consists of discrete constituents. Using our model we obtain an explicit, analytic expression for the partition function of the hole. Our partition function implies, among other things, the Hawking effect, and provides it with a microscopic explanation as a phase transition taking place at the stretched horizon. The partition function also implies the Bekenstein-Hawking entropy law. The model and its consequences are similar to those obtained previously for the Schwarzschild black hole.

Makela, Jarmo

2012-01-01T23:59:59.000Z

166

A CHARACTERIZATION AND EVALUATION OF COAL LIQUEFACTION PROCESS STREAMS  

SciTech Connect

This is the first Annual Technical Report of activities under DOE Contract No. DE-AC22-94PC93054. Activities from the first three quarters of the fiscal 1998 year were reported previously as Quarterly Technical Progress Reports (DOE/PC93054-57, DOE/PC93054-61, and DOE/PC93054-66). Activities for the period July 1 through September 30, 1998, are reported here. This report describes CONSOL's characterization of process-derived samples obtained from HTI Run PB-08. These samples were derived from operations with Black Thunder Mine Wyoming subbituminous coal, simulated mixed waste plastics, and pyrolysis oils derived from waste plastics and waste tires. Comparison of characteristics among the PB-08 samples was made to ascertain the effects of feed composition changes. A comparison also was made to samples from a previous test (Run PB-06) made in the same processing unit, with Black Thunder Mine coal, and in one run condition with co-fed mixed plastics.

G.A. Robbins; R.A. Winschel; S.D. Brandes

1999-05-01T23:59:59.000Z

167

I. Review of the information problem and black hole complementarity  

E-Print Network (OSTI)

#12;I. Review of the information problem and black hole complementarity II. The firewall argument-th/9306083): Red: Scoarse (= SBekenstein-Hawking) of evaporating black hole. Blue: (SvN of radiation the black hole is still large (green). Asides: RS = M in Planck units, remnants, A vs. A3/4 S O(RS 3

168

A Note on Real Tunneling Geometries  

E-Print Network (OSTI)

In the Hartle-Hawking ``no boundary'' approach to quantum cosmology, a real tunneling geometry is a configuration that represents a transition from a compact Riemannian spacetime to a Lorentzian universe. I complete an earlier proof that in three spacetime dimensions, such a transition is ``probable,'' in the sense that the required Riemannian geometry yields a genuine maximum of the semiclassical wave function.

S. Carlip

2005-08-17T23:59:59.000Z

169

Black Hole's Life at colliders  

E-Print Network (OSTI)

In the series of papers by Ida, Oda and Park, the complete description of Hawking radiation to the brane localized Standard Model fields from mini black holes in the low energy gravity scenarios are obtained. Here we briefly review what we have learned in those papers.

Seong Chan Park

2007-04-09T23:59:59.000Z

170

es of special conc e special concern (GSC), protected (P), or gered (E) in Idaho; species con ed (E), threatened (T), or protected (P) by  

E-Print Network (OSTI)

T3 Purple martin PProgne subis Red-naped sapsucker alis P T5Sphyrapicus nuch Red-necked grebe PPodiceps grisegena Red-tailed hawk Buteo jamaicensis P P Ring-billed gull Larus delawarensis P Rough-faced ibis Plegadis chihi P P T4 White-headed woodpecker atus SC/P P T4 SPicoides albolarv White-winged

171

Appendix 16 Listed Species and Species of Concern by Agency for the  

E-Print Network (OSTI)

. CommonName Blue Red Threatened Endangered Speciesof Concern Speciesof Concern-Rare Threatened Endangered-tailed Hummingbird 1 1 Broad-winged Hawk 1 1 California Gull 1 1 Canyon Wren 1 1 Cascade Golden-mantled Ground Double-crested Cormorant 1 1 #12;CommonName Blue Red Threatened Endangered Speciesof Concern Speciesof

172

BULLETIN ,OF THE UNITED STATES FISH COXMISSION. 385 Voll. VI, No. 28. Washilagtom, D.C. Dec. 31, 1886.  

E-Print Network (OSTI)

,578 Lake trout.............. I, oai, 000 16,500 .......... .....................240,000 Steam& Fish HawkDONALD. The distribution of youug carp, whitefish, shad, and various species of Snlntonidce is made chiefly by car. The distribution of eggs and of carp and trout to applicants not located sufficientlynear to the centers

173

Journal of the Franklin Institute 347 (2010) 662663 The 2006 Bower Award for business leadership  

E-Print Network (OSTI)

Association's Atlanta Hawks and in 1980 Turner launched CNN, the world's first live, 24-h global news network and Turner Classic Movies. In the mid-1990's, Castle Rock Entertainment and New Line Cinema became Turner Foundation, which works to conserve biodiversity by emphasizing restoration efforts of endangered

Collings, Peter

174

1191001.3 1 BEFORE THE ENERGY RESOURCES CONSERVATION AND DEVELOPMENT COMMISSION  

E-Print Network (OSTI)

AGAINST DYOCORE, INC. BROUGHT BY ENERGY COMMISSION STAFF DOCKET NO. 11-CAI-03 SOLAR POINT RESOURCES, INC 300. Testimony of Solar Point a. Chris Hawke b. Robert Tablak 301. March 4, 2011 Energy Commission. 311. Solar Point Logs of Telephone Conversations 312. Energy Commission Form CEC-1038 R1 313. Energy

175

Liouville gravity from Einstein gravity  

E-Print Network (OSTI)

We show that Liouville gravity arises as the limit of pure Einstein gravity in 2+epsilon dimensions as epsilon goes to zero, provided Newton's constant scales with epsilon. Our procedure - spherical reduction, dualization, limit, dualizing back - passes several consistency tests: geometric properties, interactions with matter and the Bekenstein-Hawking entropy are as expected from Einstein gravity.

D. Grumiller; R. Jackiw

2007-12-21T23:59:59.000Z

176

Ogmios 35  

E-Print Network (OSTI)

showed the white man that." Oscar and her linguist colleague Patsy Bedford are sitting in a Perth restaurant near where Jandamarra is being rehearsed. With them is Steve Hawke, the writer who shaped their community's oral history into a dramatised account...

Ostler, Nicholas D M

2008-01-01T23:59:59.000Z

177

CHARYBDIS: A Black hole event generator.  

E-Print Network (OSTI)

]. [15] D. M. Eardley and S. B. Giddings, Classical Black Hole Production in High-Energy Collisions, [gr-qc/0201034]. [16] S. W. Hawking, Particle Creation by Black Holes, Comm. Math. Phys. 43 (1975) 199. [17] R. Emperan, G. T. Horowitz and R. C. Myers...

Harris, Chris M; Richardson, P; Webber, Bryan R

178

Single mimivirus particles intercepted and imaged with an X-ray laser  

DOE Data Explorer (OSTI)

These are the files used to reconstruct the images in the paper "Single Mimivirus particles intercepted and imaged with an X-ray laser". Besides the diffracted intensities, the Hawk configuration files used for the reconstructions are also provided. The files from CXIDB ID 1 are the pattern and configuration files for the pattern showed in Figure 2a in the paper.

Seibert, M. Marvin; Ekeberg, Tomas; Maia, Filipe R.N.C.

179

Single mimivirus particles intercepted and imaged with an X-ray laser  

DOE Data Explorer (OSTI)

These are the files used to reconstruct the images in the paper "Single Mimivirus particles intercepted and imaged with an X-ray laser". Besides the diffracted intensities, the Hawk configuration files used for the reconstructions are also provided. The files from CXIDB ID 2 are the pattern and configuration files for the pattern showed in Figure 2b in the paper.

Seibert, M. Marvin; Ekeberg, Tomas

180

Fundamental Quantum Effects from a Quantum-Optics Perspective  

E-Print Network (OSTI)

This article provides a brief overview of some fundamental effects of quantum fields under extreme conditions. For the Schwinger mechanism, Hawking radiation, and the Unruh effect, analogies to quantum optics are discussed, which might help to approach to these phenomena from an experimental point of view.

Ralf Schtzhold

2010-04-14T23:59:59.000Z

Note: This page contains sample records for the topic "thunder hawk mc734" 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

Charged fermion tunnelling from electrically and magnetically charged rotating black hole in de Sitter space  

E-Print Network (OSTI)

Thermal radiation of electrically charged fermions from rotating black hole with electric and magnetic charges in de Sitter space is considered. The tunnelling probabilities for outgoing and incoming particles are obtained and the Hawking temperature is calculated. The relation for the classical action for the particles in the black hole's background is also found.

M. M. Stetsko

2013-06-10T23:59:59.000Z

182

Black Hole Spectrum: Continuous or Discrete?  

E-Print Network (OSTI)

We formulate a qualitative argument, based on Heisenberg's uncertainty principle, to support the claim that when the effects of matter fields are assumed to overshadow the effects of quantum mechanics of spacetime, the discrete spectrum of black hole radiation, as such as predicted by Bekenstein's proposal for a discrete black hole area spectrum, reduces to Hawking's black-body spectrum.

Jarmo Makela

1996-08-30T23:59:59.000Z

183

LifeWings Attendees Last First Status Department Date  

E-Print Network (OSTI)

, Ariel Samuel Hawks, Dustin M. Hayes, Anna K. Hayes, Rory Jude He, Harvey Hechler, Samantha Paige Kimani Herberger, Samantha Rae Herman, Stephen Edward Hermanovitch, Emily Noel Hernandez, Christine Marie Hernandez, Gilbert Joseph Hertica, Charles P. Hetherington, Stephanie E. Heuberger, Kristen Marie Hewit

Wood, James B.

184

2008-2009 Annual Report Department of Kinesiology and  

E-Print Network (OSTI)

, Ariel Samuel Hawks, Dustin M. Hayes, Anna K. Hayes, Rory Jude He, Harvey Hechler, Samantha Paige Kimani Herberger, Samantha Rae Herman, Stephen Edward Hermanovitch, Emily Noel Hernandez, Christine Marie Hernandez, Gilbert Joseph Hertica, Charles P. Hetherington, Stephanie E. Heuberger, Kristen Marie Hewit

185

Earth Science Division Overview Unidata Policy Committee  

E-Print Network (OSTI)

_Architecture_Final.pdf 2007 Decadal Survey Administration priorities and constraints Decadal survey, OCO-2, climate continuity Research Balloons Ground Stations Space-based: Sensors & Data Relay Ground Networks Uninhabited Aerial will launch four airborne campaigns with NASA's Global Hawk remotely piloted aerial systems. The flights

186

Television and the Child in Nepal: An Assessment of Viewing Patterns  

E-Print Network (OSTI)

Team8 and *1 Spy: Furthermore, other Engllsh serials (which used to be shown prior to the two above) like -Street Hawk, ~Ight RJder: and "MI-S" were also found to have been extTeme:ly well-liked by the children. In comparing -nIe A-Team" and "I Spy...

Baral, Dyutt

1990-01-01T23:59:59.000Z

187

Dinosaur behavior  

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

Dinosaur behavior Dinosaur behavior Name: kevv Status: N/A Age: N/A Location: N/A Country: N/A Date: Around 1993 Question: Did the movie Jurassic Park accurately reflect the known behavior of dinosaurs? Replies: Well, since we do not have an accurate record of that time period (Man showed up about ten million years after T-rex thundered across the plains of Antarctica *grin*) so we cannot say for certain WHAT the dinosaurs did. However, since they were wild animals, we can extrapolate from their modern contemporaries and from our knowledge of their individual anatomies what kind of behaviors they exhibited. A predator with large claws probably hunts by slashing and by piercing and holding on to prey. An herbivore with large spikes growing on its tail probably used them to fend off attackers like a spiked club -- I do not think it was much of a fashion statement

188

Patterson: Noncompliance Determination (2011-SW-2911) | Department of  

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

Patterson: Noncompliance Determination (2011-SW-2911) Patterson: Noncompliance Determination (2011-SW-2911) Patterson: Noncompliance Determination (2011-SW-2911) July 12, 2013 DOE issued a Notice of Noncompliance Determination to Dan Patterson finding that the "ThunderHead" showerhead basic model manufactured by ET Industries, Inc. and imported by Dan Patterson does not comport with the water conservation standards. DOE determined the product was noncompliant based on DOE testing. Patterson must immediately notify each person (or company) to whom Patterson distributed the noncompliant products that the product does not meet Federal standards. In addition, Patterson must provide to DOE documents and records showing the number of units Patterson distributed and to whom. The manufacturer and/or private labeler of the

189

BEFORE THE U.S. DEPARTMENT OF ENERGY  

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

ET Industries, Inc. ET Industries, Inc. ( showerheads) ) ) ) ) ) Case Number: 2012-SE-2902 NOTICE OF PROPOSED CIVIL PENAL TY Date issued: May 24, 2013 Number of alleged violations: 974 Maximum possible assessment: $194,800 Proposed civil penalty: $194,800 The U.S. Department of Energy ("DOE") Office of the General Counsel, Office of Enforcement, alleges that ET Industries Inc. ("ET") has violated cettain provisions of the Energy Policy and Conservation Act, 42 U.S.C. § 6291 et seq. ("the Act"), and 10 C.F.R. Patts 429 and 430. Specifically, DOE alleges: 1. Since March 1, 2010, ET has distributed in commerce in the United States 97 4 units of the "ThunderHead" showerhead ("basic model TH-1 " 1 ). 2. Basic model TH-1 is a "covered product" as defined in 42 U.S.C. § 6292(a)(l5) and

190

Microsoft Word - TEC - STG Minutes - 9-14-06.doc  

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

TRANSPORTATION EXTERNAL COORDINATION (TEC) WORKING GROUP TRANSPORTATION EXTERNAL COORDINATION (TEC) WORKING GROUP SECURITY TOPIC GROUP MEETING MINUTES SEPTEMBER 14, 2006 INTRODUCTION The Security Topic Group (STG) of the Transportation External Coordination (TEC) Working Group met in the afternoon of September 14, 2006 in Thunder Bay, Wisconsin. On behalf of the Department of Energy (DOE) Office of Civilian Radioactive Waste Management (OCRWM), the Chairman of the STG, Mr. Alexander Thrower of the Office of Logistics Management (RW-10), presided over the meeting. At the outset, Mr. Thrower introduced himself and the STG members participating. The STG agreed that the meeting agenda would include confirmation of conference notes from August 17, 2006 and discussion of the STG Work Plan. AUGUST 17, 2006 CONFERENCE CALL

191

Laboratory Directed Research & Development (LDRD) Day  

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

Programs » Programs » Laboratory Directed Research & Development » Laboratory Directed R&D Day Laboratory Directed Research and Development Day National security depends on science and technology. The United States relies on Los Alamos National Laboratory for the best of both. No place on Earth pursues a broader array of world-class scientific endeavors. Contact Andrea Maestas LDRD Program (505) 667-1230 Email LDRD Day 2012 Learn how LDRD innovations benefit our nation Los Alamos National Laboratory hosted its fourth annual Laboratory Directed Research and Development (LDRD) Day on October 23, 2012, at Buffalo Thunder in Pojoaque, New Mexico. More than 30 scientists and engineers from the Lab presented posters about their LDRD projects, answering questions and

192

ET Industries, Inc.  

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

ET Industries, Inc. ET Industries, Inc. (showerheads) Issued: May 24, 2013 BEFORE THE U.S. DEPARTMENT OF ENERGY Washington, D.C. 20585 ) ) ) ) ) Case Number: 2012-SE-2902 AMENDED NOTICE OF NONCOMPLIANCE DETERMINATION 1 Manufacturers (including importers) are prohibited from distributing covered products in the United States that do not comply with applicable federal water conservation standards. See 10 C.F.R. §§ 429.5, 429.102; 42 U.S.C. §§ 6291(10), 6302. On April 3, 2012, DOE tested one unit of the "ThunderHead" showerhead basic model ("basic model TH-1 " 2 ), which ET Industries, Inc. ("ET") imported into the United States. On April 24, 2012, DOE completed testing of three additional units of basic model TH-1, also imported into

193

Beam transport and monitoring for laser plasma accelerators  

SciTech Connect

The controlled transport and imaging of relativistic electron beams from laser plasma accelerators (LPAs) are critical for their diagnostics and applications. Here we present the design and progress in the implementation of the transport and monitoring system for an undulator based electron beam diagnostic. Miniature permanent-magnet quadrupoles (PMQs) are employed to realize controlled transport of the LPA electron beams, and cavity based electron beam position monitors for non-invasive beam position detection. Also presented is PMQ calibration by using LPA electron beams with broadband energy spectrum. The results show promising performance for both transporting and monitoring. With the proper transport system, XUV-photon spectra from THUNDER will provide the momentum distribution of the electron beam with the resolution above what can be achieved by the magnetic spectrometer currently used in the LOASIS facility.

Nakamura, K.; Sokollik, T.; Tilborg, J. van; Gonsalves, A. J.; Shaw, B.; Shiraishi, S.; Mittal, R.; De Santis, S.; Byrd, J. M.; Leemans, W. [Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States) and University of California, Berkeley, CA 94720 (United States)

2012-12-21T23:59:59.000Z

194

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

SciTech Connect

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

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

2010-10-15T23:59:59.000Z

195

Direct liquefaction proof-of-concept program. Topical report  

DOE Green Energy (OSTI)

This report presents the results of work conducted under the DOE Proof-of-Concept Program in direct coal liquefaction at Hydrocarbon Technologies, Inc. in Lawrenceville, New Jersey, from February 1994 through April 1995. The work includes modifications to HRI`s existing 3 ton per day Process Development Unit (PDU) and completion of the second PDU run (POC Run 2) under the Program. The 45-day POC Run 2 demonstrated scale up of the Catalytic Two-Stage Liquefaction (CTSL Process) for a subbituminous Wyoming Black Thunder Mine coal to produce distillate liquid products at a rate of up to 4 barrels per ton of moisture-ash-free coal. The combined processing of organic hydrocarbon wastes, such as waste plastics and used tire rubber, with coal was also successfully demonstrated during the last nine days of operations of Run POC-02. Prior to the first PDU run (POC-01) in this program, a major effort was made to modify the PDU to improve reliability and to provide the flexibility to operate in several alternative modes. The Kerr McGee Rose-SR{sup SM} unit from Wilsonville, Alabama, was redesigned and installed next to the U.S. Filter installation to allow a comparison of the two solids removal systems. The 45-day CTSL Wyoming Black Thunder Mine coal demonstration run achieved several milestones in the effort to further reduce the cost of liquid fuels from coal. The primary objective of PDU Run POC-02 was to scale-up the CTSL extinction recycle process for subbituminous coal to produce a total distillate product using an in-line fixed-bed hydrotreater. Of major concern was whether calcium-carbon deposits would occur in the system as has happened in other low rank coal conversion processes. An additional objective of major importance was to study the co-liquefaction of plastics with coal and waste tire rubber with coal.

Comolli, A.G.; Lee, L.K.; Pradhan, V.R. [and others

1996-12-01T23:59:59.000Z

196

Direct liquefaction proof-of-concept program. Finaltopical report, Bench Run 4 (227-95)  

SciTech Connect

This report presents the results of bench-scale work, Bench Run PB-04, conducted under the DOE Proof of Concept-Bench Option Program in direct coal liquefaction at Hydrocarbon Technologies, Inc. in Lawrenceville, New Jersey. The Bench Run PB-04 was the fifth of the nine runs planned in the POC Bench Option Contract between the U.S. DOE and Hydrocarbon Technologies, Inc. Bench Run PB-04 had multiple goals. These included the evaluation of the effects of dispersed slurry catalyst system on the performance of direct liquefaction of a subbituminous Wyoming Black Thunder mine coal under extinction recycle (454{degrees}C+ recycle) condition; another goal was to investigate the effects of the combined processing of automobile shredder residue (auto-fluff) with coal and other organic waste materials. PB-04 employed a two-stage, back-mixed, slurry reactor system with an interstage V/L separator and an in-line fixed-bed hydrotreater. The HTI`s newly modified P/Fe catalyst was very effective for direct liquefaction and coprocessing of Black Thunder mine subbituminous coal with Hondo resid and auto-fluff; during `coal-only` liquefaction mode, over 93% maf coal conversion was obtained with about 90% residuum conversion and as high as 67% light distillate (C{sub 4}-975 F) yield, while during `coprocessing` mode of operation, distillate yields varied between 58 and 69%; the residuum conversions varied between 74 and 89% maf. Overall, it is concluded, based upon the yield data available from PB-04, that auto-effective as MSW plastics in improving coal hydroconversion process performance. Auto-fluff did not increase light distillate yields nor decrease light gas make and chemical hydrogen consumption in coal liquefaction, as was observed to occur with MSW plastics.

Comolli, A.G.; Pradhan, V.R.; Lee, T.L.K. [and others

1997-03-01T23:59:59.000Z

197

11Fermi 2/19/99  

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

Hawking Ponders Infinity Hawking Ponders Infinity ÒCAN YOU HEAR ME?Ó A substantial baritone, round and full; the accent borderline Scottish or Welsh, but schooled well short of a full brogue. A hint of wry in the tone, promising a barb or two before the nightÕs work was done. The voice immediately owned every expanse of the Arie Crown Theater at McCormick Place, ChicagoÕs gargantuan convention center by the lake. But who owned the voice? A motorized wheelchair rested at center stage, life support apparatus stacked behind the wheels, its inhabitant almost too still for reality. His head leaned unmoving against his right shoulder, his skeletal body angled in the chair like an oddly-bent wire coathanger. In front of him was a small custom computer console, where a minute twitch of his finger

198

Evolution of Primordial Black Holes in a radiation and phantom energy environment  

E-Print Network (OSTI)

In this work we extend previous work on the evolution of a Primordial Black Hole (PBH) to address the presence of a dark energy component with a super-negative equation of state as a background, investigating the competition between the radiation accretion, the Hawking evaporation and the phantom accretion, the latter two causing a decrease on black hole mass. It is found that there is an instant during the matter-dominated era after which the radiation accretion becomes negligible compared to the phantom accretion. The Hawking evaporation may become important again depending on a mass threshold. The evaporation of PBHs is quite modified at late times by these effects, but only if the Generalized Second Law of thermodynamics is violated.

Daniel C. Guariento; J. E. Horvath; P. S. Custdio; J. A. de Freitas Pacheco

2007-11-22T23:59:59.000Z

199

NEWTON, Ask a Scientist at Argonne National Labs  

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

Owl Predators Owl Predators Name: Mia Status: student Grade: K-3 Location: MN Country: USA Date: Winter 2011-2012 Question: What are the predators of a owl? Replies: Mia: Our largest adult owls have few predators. Smaller owls may be prey of other owls, long-eared owls are sometimes eaten by great horned owls, for example. Ground nesting owls, like short-eared owls, and especially nestlings, may be hunted by many predators, coyotes and other hawks and owls most likely. Nestlings of all birds, including owls may be hunted by other birds, raccoons, snakes and other animals that can climb trees. J. Elliott Hi Mia Predators of owls include: Opossums Racoons Hawks, Eagles and other raptors Other owls House cats Snakes that raid nests Accidents such as falling out of a nest, colliding with a tree, and electric power lines also contribute to owl mortality.

200

Supersymmetric Yang Mills Fields and Black Holes ; In Ten Dimensional Unified Field Theory  

E-Print Network (OSTI)

The Ten dimensional Unified field theory has a 4 dimensional Riemannian spacetime and six dimensional Calabi Yau space structure. The supersymmetric Yang Mills fields and black holes are solutions in these theories. The formation of primordial black holes in early universe, the collapse to singularity of stellar black holes, the Hawking evaporation of microscopic black holes in LHC are topics of observational and theoretical interest. The observation of gamma ray bursts and creation of spectrum of particles and radiation of dark and normal matter occur due to primordial and microscopic black holes. The approach to singularity in black hole interior solutions, require the Bogoliubov transforms of SUSY YM fields in black hole geometries; both during formation and in evaporation. The Hawking effect of radiating black holes is applicable for all the fields. Invariants can be defined to give the conditions for these processes.

Ajay Patwardhan

2007-05-17T23:59:59.000Z

Note: This page contains sample records for the topic "thunder hawk mc734" 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

Charged fermions tunneling from regular black holes  

SciTech Connect

We study Hawking radiation of charged fermions as a tunneling process from charged regular black holes, i.e., the Bardeen and ABGB black holes. For this purpose, we apply the semiclassical WKB approximation to the general covariant Dirac equation for charged particles and evaluate the tunneling probabilities. We recover the Hawking temperature corresponding to these charged regular black holes. Further, we consider the back-reaction effects of the emitted spin particles from black holes and calculate their corresponding quantum corrections to the radiation spectrum. We find that this radiation spectrum is not purely thermal due to the energy and charge conservation but has some corrections. In the absence of charge, e = 0, our results are consistent with those already present in the literature.

Sharif, M., E-mail: msharif.math@pu.edu.pk; Javed, W., E-mail: wajihajaved84@yahoo.com [University of the Punjab, Department of Mathematics (Pakistan)

2012-11-15T23:59:59.000Z

202

Partition Function of Spacetime  

E-Print Network (OSTI)

We consider a microscopic model of spacetime, where spacetime is assumed to be a specific graph with Planck size quantum black holes on its vertices. As a thermodynamical system under consideration we take a certain uniformly accelerating, spacelike two-surface of spacetime which we call, for the sake of brevity and simplicity, as {\\it acceleration surface}. Using our model we manage to obtain an explicit and surprisingly simple expression for the partition function of an acceleration surface. Our partition function implies, among other things, the Unruh and the Hawking effects. It turns out that the Unruh and the Hawking effects are consequences of a specific phase transition, which takes place in spacetime, when the temperature of spacetime equals, from the point of view of an observer at rest with respect to an acceleration surface, to the Unruh temperature measured by that observer. When constructing the partition function of an acceleration surface we are forced to introduce a quantity which plays the ro...

Makela, Jarmo

2008-01-01T23:59:59.000Z

203

Black Holes at Future Colliders and Beyond: a Topical Review  

E-Print Network (OSTI)

One of the most dramatic consequences of low-scale (~1 TeV) quantum gravity in models with large or warped extra dimension(s) is copious production of mini black holes at future colliders and in ultra-high-energy cosmic ray collisions. Hawking radiation of these black holes is expected to be constrained mainly to our three-dimensional world and results in rich phenomenology. In this topical review we discuss the current status of astrophysical observations of black holes and selected aspects of mini black hole phenomenology, such as production at colliders and in cosmic rays, black hole decay properties, Hawking radiation as a sensitive probe of the dimensionality of extra space, as well as an exciting possibility of finding new physics in the decays of black holes.

Greg Landsberg

2006-07-26T23:59:59.000Z

204

A Quantum Bousso Bound  

E-Print Network (OSTI)

The Bousso bound requires that one quarter the area of a closed codimension two spacelike surface exceeds the entropy flux across a certain lightsheet terminating on the surface. The bound can be violated by quantum effects such as Hawking radiation. It is proposed that at the quantum level the bound be modified by adding to the area the quantum entanglement entropy across the surface. The validity of this quantum Bousso bound is proven in a two-dimensional large N dilaton gravity theory.

Andrew Strominger; David Thompson

2003-03-10T23:59:59.000Z

205

Conformal equivalence of 2D dilaton gravity models  

E-Print Network (OSTI)

We investigate the behavior of generic, matter-coupled, 2D dilaton gravity theories under dilaton-dependent Weyl rescalings of the metric. We show that physical observables associated with 2D black holes, such as the mass, the temperature and the flux of Hawking radiation are invariant under the action of both Weyl transformations and dilaton reparametrizations. The field theoretical and geometrical meaning of these invariances is discussed.

Mariano Cadoni

1996-10-25T23:59:59.000Z

206

First law of thermodynamics in IR modified Horava-Lifshitz gravity  

Science Conference Proceedings (OSTI)

We study the first law of thermodynamics in IR modified Horava-Lifshitz spacetime. Based on the Bekenstein-Hawking entropy, we obtain the integral formula and the differential formula of the first law of thermodynamics for the Kehagias-Sfetsos black hole by treating {omega} as a new state parameter and redefining a mass that is just equal to M{sub ADM} obtained by Myung [32] if we take {alpha}=3{pi}/8.

Wang Mengjie; Jing Jiliang; Ding Chikun; Chen Songbai [Institute of Physics and Department of Physics, Hunan Normal University, Changsha, Hunan 410081 (China) and Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of Education, Hunan Normal University, Changsha, Hunan 410081 (China)

2010-04-15T23:59:59.000Z

207

On the pattern of black hole information release  

E-Print Network (OSTI)

We propose a resolution to black hole information paradox by analyzing scattering amplitudes of a complex scalar field around a Schwarzschild black hole. The scattering cross section reveals much information on the incoming state but exhibits flux loss at the same time. The flux loss should be temporary, and indicate mass growth of the black hole. The black hole should Hawking-radiate subsequently, thereby, compensating for the flux loss.

Park, I Y

2013-01-01T23:59:59.000Z

208

Missing energy in black hole production and decay at the Large Hadron Collider  

E-Print Network (OSTI)

Black holes could be produced at the Large Hadron Collider in TeV-scale gravity scenarios. We discuss missing energy mechanisms in black hole production and decay in large extra-dimensional models. In particular, we examine how graviton emission into the bulk could give the black hole enough recoil to leave the brane. Such a perturbation would cause an abrupt termination in Hawking emission and result in large missing-energy signatures.

Douglas M. Gingrich

2007-06-05T23:59:59.000Z

209

Spacetime Structure of an Evaporating Black Hole in Quantum Gravity  

E-Print Network (OSTI)

The impact of the leading quantum gravity effects on the dynamics of the Hawking evaporation process of a black hole is investigated. Its spacetime structure is described by a renormalization group improved Vaidya metric. Its event horizon, apparent horizon, and timelike limit surface are obtained taking the scale dependence of Newton's constant into account. The emergence of a quantum ergosphere is discussed. The final state of the evaporation process is a cold, Planck size remnant.

Bonanno, A

2006-01-01T23:59:59.000Z

210

Black Hole Thermodynamics and Electromagnetism  

E-Print Network (OSTI)

We show a strong parallel between the Hawking, Beckenstein black hole Thermodynamics and electromagnetism: When the gravitational coupling constant transform into the electromagnetic coupling constant, the Schwarzchild radius, the Beckenstein temperature, the Beckenstein decay time and the Planck mass transform to respectively the Compton wavelength, the Hagedorn temperature, the Compton time and a typical elementary particle mass. The reasons underlying this parallalism are then discussed in detail.

Burra G. Sidharth

2005-07-15T23:59:59.000Z

211

Of the Black Hole Thermodynamics  

E-Print Network (OSTI)

About thirty years ago, Bekenstein and Hawking introduced three basic concepts relating to black hole, namely, the "area entropy", "gravitation temperature" and "thermal radiation". The author analyzes these concepts systematically and concludes that they are mostly inadequate or wrong. He points out that a black hole's taking in thermal radiation from the space is an energy-gathering process. It is special, even extraordinary. It reduces entropy, violating Clausius' second law.

Xinyong Fu

2005-01-11T23:59:59.000Z

212

Thermodynamical Properties of Horizons  

E-Print Network (OSTI)

We show, by using Regge calculus, that the entropy of any finite part of a Rindler horizon is, in the semi-classical limit, one quarter of the area of that part. We argue that this result implies that the entropy associated with any horizon of spacetime is, in semi-classical limit, one quarter of its area. As an example, we derive the Bekenstein-Hawking entropy law for the Schwarzschild black hole.

J. Makela; A. Peltola

2002-05-30T23:59:59.000Z

213

Regular black hole in three dimensions  

E-Print Network (OSTI)

We find a new black hole in three dimensional anti-de Sitter space by introducing an anisotropic perfect fluid inspired by the noncommutative black hole. This is a regular black hole with two horizons. We compare thermodynamics of this black hole with that of non-rotating BTZ black hole. The first-law of thermodynamics is not compatible with the Bekenstein-Hawking entropy.

Yun Soo Myung; Myungseok Yoon

2008-10-01T23:59:59.000Z

214

SRNL - News Room  

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

9 Archives 9 Archives Archives: Pre-2006 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 Mo-Sci Corporation to Manufacture, Market SRNL's Unique Glass Microspheres AIKEN, S.C. (December 17, 2009) - A licensing agreement between the U.S. Department of Energy's Savannah River National Laboratory (SRNL) and specialty glass provider Mo-Sci Corporation will make SRNL's unique Porous Walled Hollow Glass Microspheres available for use in targeted drug delivery, hydrogen storage and other uses, including applications still being developed. MORE » SRNL Establishes Presence at Charleston's SeaHawk AIKEN, S.C. (Nov. 17, 2009) - To support homeland security initiatives, the U.S. Department of Energy's Savannah River National Laboratory has established a permanent presence at the SeaHawk interagency operations center (IOC). SeaHawk was established by Congress in 2003 and located at the Port of Charleston (S.C.) as a collaborative initiative designed to bring multiple agencies together to enhance port security operations and coordination among federal, state and local agencies. MORE »

215

Phases of information release during black hole evaporation  

E-Print Network (OSTI)

In a recent article, we have shown how quantum fluctuations of the background geometry modify Hawking's density matrix for black hole (BH) radiation. Hawking's diagonal matrix picks up small off-diagonal elements whose influence becomes larger with the number of emitted particles. We have calculated the "time-of-first-bit", when the first bit of information comes out of the BH, and the "transparency time", when the rate of information release becomes order unity. We have found that the transparency time is equal to the "Page time", when the BH has lost half of its initial entropy to the radiation, in agreement with Page's results. Here, we improve our previous calculation by keeping track of the time of emission of the Hawking particles and their back-reaction on the BH. Our analysis reveals a new time scale, the radiation "coherence time", which is equal to the geometric mean of the evaporation time and the light crossing time. We find, as for our previous treatment, that the time-of-first-bit is equal to the coherence time, which is much shorter than the Page time. But the transparency time is now much later than the Page time, just one coherence time before the end of evaporation. Close to the end, when the BH is parametrically of Planckian dimensions but still large, the coherence time becomes parametrically equal to the evaporation time, thus allowing the radiation to purify. We also determine the time dependence of the entanglement entropy of the early and late-emitted radiation. This entropy is small during most of the lifetime of the BH, but our qualitative analysis suggests that it becomes parametrically maximal near the end of evaporation.

Ram Brustein; A. J. M. Medved

2013-10-22T23:59:59.000Z

216

Slide 1  

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

Uranium Processing Facility Uranium Processing Facility Harry E. Peters Y-12 Site Office Federal Project Director Uranium Processing Facility Project February 8, 2012 APPROVED FOR PUBLIC RELEASE This document has been approved for release to the public by: /s/ Scott A. Hawks 2/9/12 YSO Classification Officer Date The Nation's EU Processing Facility Mission: Ensuring the Nation's enriched uranium processing is secure, safe, and efficient. UPF-Key to Y-12 Transformation Today Future * 9212 is past end-of-life * Existing EU facilities don't meet modern nuclear safety or security standards

217

A Self-consistent Model of the Black Hole Evaporation  

E-Print Network (OSTI)

We construct a self-consistent model which describes a black hole from formation to evaporation including the back reaction from the Hawking radiation. In the case where a null shell collapses, at the beginning the evaporation occurs, but it stops eventually, and a horizon and singularity appear. On the other hand, in the generic collapse process of a continuously distributed null matter, the black hole evaporates completely without forming a macroscopically large horizon nor singularity. We also find a stationary solution in the heat bath, which can be regarded as a normal thermodynamic object.

Hikaru Kawai; Yoshinori Matsuo; Yuki Yokokura

2013-02-19T23:59:59.000Z

218

Ornithological Survey of the Proposed Geothermal Well Site No. 2  

DOE Green Energy (OSTI)

The U.S. Fish and Wildlife Service (USFWS 1983) and the State of Hawaii (DLNR 1986) have listed as endangered six forest bird species for the Island of Hawaii. Two of these birds, the O'u (Psittirostra psittacea) and the Hawaiian hawk (Buteo solitarius) may be present within the Geothermal resource sub-zone (Scott et al. 1986). Thus, their presence could impact future development within the resource area. This report presents the results of a bird survey conducted August 11 and 12, 1990 in the sub-zone in and around the proposed well site and pad for True/Mid Pacific Geothermal Well No.2.

Jeffrey, Jack

1990-08-16T23:59:59.000Z

219

Slide 1  

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

Legal Lessons You Need To Learn Legal Lessons You Need To Learn 1 1 "Legal Landmines for Small Contractors" United States Department of Energy 12th Annual Small Business Conference & Expo 11 May 2011 Kansas City, Missouri Mark R. "Hawk" Thomas, Esq. Reid Law PC Legal Lessons You Need To Learn 2 2 Federal Contracts - IP - Business Ventures ____________________________________________ SBA Certifications Teaming & Joint Ventures Subcontracts & Suppliers Solicitations & Bids Cost & Labor Standards Contract Negotiation ITAR & Export Control Inventions & Data Rights Inspection & Warranty Size Determinations Protests & Appeals Contract Termination Dispute Resolution False Claims & Fraud Suspension & Debarment ______________________________________________

220

Two Line Subject Title One Line Title  

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

& Development & Development Advanced Alloy Fabrication Jeffrey A. Hawk & Paul D. Jablonski Materials Research Engineer & Metallurgist, NETL Wednesday, November 25, 2012 ‹#› Technology or Capability Overview * Computer Modeling for Alloy Design & Life Prediction * Melting, Casting, Fabrication & Heat Treatment * Environmental Characterization * Mechanical Testing & Evaluation * Microstructure Characterization & Analysis ‹#› Technology or Capability Overview * Computer Modeling for Alloy Design & Life Prediction * Melting, Casting, Fabrication & Heat Treatment * Environmental Characterization * Mechanical Testing & Evaluation * Microstructure Characterization & Analysis ‹#› Melting and Fabrication Facilities

Note: This page contains sample records for the topic "thunder hawk mc734" 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

Cold Black Holes in the Einstein-Scalar Field System  

E-Print Network (OSTI)

We study Einstein gravity coupled to a massless scalar field in a static spherically symmetric space-time in four dimensions. Black hole solutions exist when the kinetic energy of the scalar field is negative, that is, for a phantom field. These scalar black holes have an infinite horizon area and zero temperature. They are related through a conformal transformation with similar objects in the Jordan frames of scalar-tensor theories of gravity. The thermodynamical properties of these solutions are discussed. It is proved that any static, spherically symmetric black holes with an infinite horizon area have zero Hawking temperature.

K. A. Bronnikov; J. C. Fabris; N. Pinto-neto; M. E. Rodrigues; Icra-cbpf Rua Xavier Sigaud

2008-01-01T23:59:59.000Z

222

Cold black holes and conformal continuations  

E-Print Network (OSTI)

We study Einstein gravity minimally coupled to a scalar field in a static, spherically symmetric space-time in four dimensions. Black hole solutions are shown to exist for a phantom scalar field whose kinetic energy is negative. These ``scalar black holes'' have an infinite horizon area and zero Hawking temperature and are termed ``cold black holes'' (CBHs). The relevant explicit solutions are well-known in the massless case (the so-called anti-Fisher solution), and we have found a particular example of a CBH with a nonzero potential $V(\\phi)$. All CBHs with $V(\\phi) \

K. A. Bronnikov; M. S. Chernakova; J. C. Fabris; N. Pinto-Neto; M. E. Rodrigues

2006-09-20T23:59:59.000Z

223

Cold Black Holes in the Einstein-Scalar Field System  

E-Print Network (OSTI)

We study Einstein gravity coupled to a massless scalar field in a static spherically symmetric space-time in four dimensions. Black hole solutions exist when the kinetic energy of the scalar field is negative, that is, for a phantom field. These ``scalar black holes'' have an infinite horizon area and zero temperature. They are related through a conformal transformation with similar objects in the Jordan frames of scalar-tensor theories of gravity. The thermodynamical properties of these solutions are discussed. It is proved that any \\ssph \\bhs with an infinite horizon area have zero Hawking temperature.

K. A. Bronnikov; J. C. Fabris; N. Pinto-Neto; M. E. Rodrigues

2006-04-11T23:59:59.000Z

224

Classical black hole evaporation in Randall-Sundrum infinite braneworld  

E-Print Network (OSTI)

After the gravity induced on the brane in the Randall-Sundrum (RS) infinite braneworld is briefly reviewed, we discuss the possibility that black holes evaporate as a result of classical evolution in this model based on the AdS/CFT correspondence. If this possibility is really the case, the existence of long-lived solar mass black holes will give the strongest constraint on the bulk curvature radius. At the same time, we can propose a new method to simulate the evaporation of a 4D black hole due to the Hawking radiation as a 5D process.

Takahiro Tanaka

2002-03-24T23:59:59.000Z

225

Induced gravity and entanglement entropy of 2D black holes  

E-Print Network (OSTI)

Using the fact that 2D Newton constant is wholly induced by a conformal field theory, we derive a formula for the entanglement entropy of the anti-de Sitter black hole in two spacetime dimensions. The leading term in the large black hole mass expansion of our formula reproduces exactly the Bekenstein-Hawking entropy S_{BH}, whereas the subleading term behaves as ln S_{BH}. This subleading term has the universal form typical for the entanglement entropy of physical systems described by effective conformal fields theories (e.g. one-dimensional statistical models at the critical point).

Mariano Cadoni

2007-09-03T23:59:59.000Z

226

Black Hole Remnants and Dark Matter  

DOE Green Energy (OSTI)

We argue that, when the gravity effect is included, the generalized uncertainty principle (GUP) may prevent black holes from total evaporation in a similar way that the standard uncertainty principle prevents the hydrogen atom from total collapse. Specifically we invoke the GUP to obtain a modified Hawking temperature, which indicates that there should exist non-radiating remnants (BHR) of about Planck mass. BHRs are an attractive candidate for cold dark matter. We investigate an alternative cosmology in which primordial BHRs are the primary source of dark matter.

Chen, Pisin

2002-07-31T23:59:59.000Z

227

Some aspects of virtual black holes  

SciTech Connect

We first consider consistently third-quantize modified gravity. We then analyze certain aspects of virtual black holes in this third-quantized modified gravity. We see how a statistical mechanical origin for the Bekenstein-Hawking entropy naturally arises in this model. Furthermore, the area and hence the entropy of a real macroscopic black hole is quantized in this model. Virtual black holes cause a loss of quantum coherence, which gives an intrinsic entropy to all physical systems that can be used to define a direction of time and hence provide a solution to the problem of time.

Faizal, M., E-mail: faizal.mir@durham.ac.uk [University of Durham, Department of Mathematics (United Kingdom)

2012-03-15T23:59:59.000Z

228

Extended Green-Liouville asymptotics and vacuum polarization for lukewarm black holes  

E-Print Network (OSTI)

We consider a quantum field on a lukewarm black hole spacetime. We introduce a new uniform approximation to the radial equation, constructed using an extension of Green-Liouville asymptotics. We then use this new approximation to construct the renormalized vacuum polarization in the Hartle-Hawking vacuum. Previous calculations of the vacuum polarization rely on the WKB approximation to the solutions of the radial equation, however the nonuniformity of the WKB approximations obscures the results of these calculations near both horizons. The use of our new approximation eliminates these obscurities, enabling us to obtain explicitly finite and easily calculable values of the vacuum polarization on the two horizons.

Cormac Breen; Adrian C. Ottewill

2010-06-25T23:59:59.000Z

229

On the pattern of black hole information release  

E-Print Network (OSTI)

We propose a step towards a resolution to black hole information paradox by analyzing scattering amplitudes of a complex scalar field around a Schwarzschild black hole. The scattering cross section reveals much information on the incoming state but exhibits flux loss at the same time. The flux loss should be temporary, and indicate mass growth of the black hole. The black hole should Hawking-radiate subsequently, thereby, compensating for the flux loss. We comment on the possibility that information bleaching may be the key to the paradox.

I. Y. Park

2013-01-27T23:59:59.000Z

230

Energy of gravitational radiation in plane-symmetric space-times  

E-Print Network (OSTI)

Gravitational radiation in plane-symmetric space-times can be encoded in a complex potential, satisfying a non-linear wave equation. An effective energy tensor for the radiation is given, taking a scalar-field form in terms of the potential, entering the field equations in the same way as the matter energy tensor. It reduces to the Isaacson energy tensor in the linearized, high-frequency approximation. An energy conservation equation is derived for a quasi-local energy, essentially the Hawking energy. A transverse pressure exerted by interacting low-frequency gravitational radiation is predicted.

Sean A. Hayward

2008-05-19T23:59:59.000Z

231

Particle creation in (2+1) circular dust collapse  

E-Print Network (OSTI)

We investigate the quantum particle creation during the circularly symmetric collapse of a 2+1 dust cloud, for the cases when the cosmological constant is either zero or negative. We derive the Ford-Parker formula for the 2+1 case, which can be used to compute the radiated quantum flux in the geometric optics approximation. It is shown that no particles are created when the collapse ends in a naked singularity, unlike in the 3+1 case. When the collapse ends in a BTZ black hole, we recover the expected Hawking radiation. 1

Sashideep Gutti; T. P. Singh

2007-01-01T23:59:59.000Z

232

Fiber-optical analogue of the event horizon  

E-Print Network (OSTI)

The physics at the event horizon resembles the behavior of waves in moving media. Horizons are formed where the local speed of the medium exceeds the wave velocity. We use ultrashort pulses in microstructured optical fibers to demonstrate the formation of an artificial event horizon in optics. We observed a classical optical effect, the blue-shifting of light at a white-hole horizon. We also show by theoretical calculations that such a system is capable of probing the quantum effects of horizons, in particular Hawking radiation.

Thomas G. Philbin; Chris Kuklewicz; Scott Robertson; Stephen Hill; Friedrich Konig; Ulf Leonhardt

2007-11-29T23:59:59.000Z

233

Radion clouds around evaporating black holes  

E-Print Network (OSTI)

A Kaluza-Klein model, with a matter source associated with Hawking radiation from an evaporating black hole, is used to obtain a simple form for the radion effective potential. The environmental effect generally causes a matter-induced shift of the radion vacuum, resulting in the formation of a radion cloud around the hole. There is an albedo due to the radion cloud, with an energy dependent reflection coefficient that depends upon the size of the extra dimensions and the temperature of the hole.

J. R. Morris

2009-09-03T23:59:59.000Z

234

Black hole masking and black hole thermodynamics  

E-Print Network (OSTI)

Masking of black holes means that, for given total mass and Hawking temperatures, these data may correspond to either "pure" black hole or a black hole of a lesser mass surrounded by a massive shell. It is shown that there is one-to one correspondence between this phenomenon and thermodynamics of a black hole in a finite size cavity: masking of black holes is possible if and only if there exists at least one locally unstable black hole solution in the corresponding canonical ensemble.

Zaslavskii, Oleg B

2011-01-01T23:59:59.000Z

235

Black Hole Radiation and Volume Statistical Entropy  

E-Print Network (OSTI)

The simplest possible equation for Hawking radiation, and other black hole radiated power is derived in terms of black hole density. Black hole density also leads to the simplest possible model of a gas of elementary constituents confined inside a gravitational bottle of Schwarzchild radius at tremendous pressure, which yields identically the same functional dependence as the traditional black hole entropy. Variations of Sbh can be obtained which depend on the occupancy of phase space cells. A relation is derived between the constituent momenta and the black hole radius which is similar to the Compton wavelength relation.

Mario Rabinowitz

2005-06-03T23:59:59.000Z

236

Black Hole evaporation in semi-classical approach  

E-Print Network (OSTI)

As well as known, the black hole evaporation problem is famous problem. Because the S.W.Hawking found the black holes emit light at the future null infinity as a thermal radiation \\cite{H}, we think that the black holes may be vanish. However, to prove this problem, we should solve field equation, i.e. forth order partial differential equations \\cite{Ford}\\cite{BD}. However, we can find a method to solve this equation, and we could prove that the black holes finally vanish. To solve this problem we use dynamical horizons equation in the Vaidya spacetime.

Shintaro Sawayama

2011-02-15T23:59:59.000Z

237

Bounding the greybody factors for the Reissner-Nordstrm black holes  

E-Print Network (OSTI)

A black hole can emit radiation called Hawking radiation. Such radiation seen by an observer outside the black hole differs from the original radiation near the horizon of the black hole by the so-called "greybody factor". In this paper, the bounds of the greybody factors for the Reissner-Nordstr\\"{o}m black holes are obtained. These bounds can be derived by using the 2 x 2 transfer matrices. It is found that the charges of black holes act as good barriers.

Tritos Ngampitipan; Petarpa Boonserm

2013-01-31T23:59:59.000Z

238

Sensitivity of the FERMI Detectors to Gamma-Ray Bursts from Evaporating Primordial Black Holes (PBHs)  

E-Print Network (OSTI)

Primordial Black Holes (PBHs), which may have been created in the early Universe, are predicted to be detectable by their Hawking radiation. The Fermi Gamma-ray Space Telescope observatory offers increased sensitivity to the gamma-ray bursts produced by PBHs with an initial mass of $\\sim 5\\times 10^{14}$ g expiring today. PBHs are candidate progenitors of unidentified Gamma-Ray Bursts (GRBs) that lack X-ray afterglow. We propose spectral lag, which is the temporal delay between the high and low energy pulses, as an efficient method to identify PBH evaporation events with the Fermi Large Area Telescope (LAT).

T. N. Ukwatta; Jane H. MacGibbon; W. C. Parke; K. S. Dhuga; S. Rhodes; A. Eskandarian; N. Gehrels; L. Maximon; D. C. Morris

2010-03-23T23:59:59.000Z

239

Spectral Lags of Gamma-Ray Bursts from Primordial Black Hole (PBH) Evaporations  

E-Print Network (OSTI)

Primordial Black Holes (PBHs), which may have been created in the early Universe, are predicted to be detectable by their Hawking radiation. PBHs with an initial mass of 5.0 * 10^14 g should be expiring today with a burst of high energy particles. Evaporating PBHs in the solar neighborhood are candidate Gamma-Ray Bursts (GRBs) progenitors. We propose spectral lag, which is the temporal delay between the high energy photon pulse and the low energy photon pulse, as a possible method to detect PBH evaporation events with the Fermi Gamma-ray Space Telescope Observatory.

T. N. Ukwatta; J. H. MacGibbon; W. C. Parke; K. S. Dhuga; A. Eskandarian; N. Gehrels; L. Maximon; D. C. Morris

2009-01-05T23:59:59.000Z

240

Assessment of the Impacts of Green Mountain Power Corporation's Wind Power Facility on Breeding and Migrating Birds in Searsburg, Vermont: July 1996--July 1998  

DOE Green Energy (OSTI)

A 6-megawatt, 11 turbine wind power development was constructed by Green Mountain Power Corporation in Searsburg, southern Vermont, in 1996. To determine whether birds were impacted, a series of modified BA (Before, After) studies was conducted before construction (1993-1996), during (1996), and after (1997) construction on the project site. The studies were designed to monitor changes in breeding bird community (species composition and abundance) on the site, examine the behavior and numbers of songbirds migrating at night over the site and hawks migrating over the site in daylight, and search for carcasses of birds that might have collided with the turbines.

Kerlinger, P.

2002-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "thunder hawk mc734" 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

Quantization of the black hole area as quantization of the angular momentum component  

E-Print Network (OSTI)

In transforming from Schwarzschild to Euclidean Rindler coordinates the Schwarzschild time transforms to a periodic angle. As is well-known, this allows one to introduce the Hawking temperature and is an origin of black hole thermodynamics. On the other hand, according to quantum mechanics this angle is conjugate to the $z$ component of the angular momentum. From the commutation relation and quantization condition for the angular momentum component it is found that the area of the horizon of a Schwarzschild black hole is quantized with the quantum $\\Delta A = 8\\pi l_P^{2}$. It is shown that this conclusion is also valid for a generic Kerr-Newman black hole.

Kostyantyn Ropotenko

2009-06-10T23:59:59.000Z

242

ARM - Facility News Article  

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

ARM Facility Captures Rare Tornado Data ARM Facility Captures Rare Tornado Data Bookmark and Share Every spring, tornadoes thunder across five states, from Kansas to Texas, and alerts are common. However, by Monday, May 20, it was clear that this time the alert had a different urgency to it. The turn of events leading up to the EF-5 tornado that wreaked havoc in Moore, Oklahoma, provided a unique opportunity for scientists to sample the environment preceding a severe weather event. Raw data from the additional radiosonde launches preceding the severe weather events of May 20 in Oklahoma. The blue line identifies the temperature, which decreases with increasing altitude (decreasing pressure). The red line is the dew point; dew point-also expressed as a temperature-is the temperature at which the air is 100% saturated with its water vapor content (low values of the dew point represent low relative humidity). Where the dew point approaches the actual temperature, the air is nearing 100% relative humidity, or saturation, near the ground-ideal conditions for tornado events.

243

A characterization and evaluation of coal liquefaction process streams. Quarterly technical progress report, October 1--December 31, 1995  

DOE Green Energy (OSTI)

The objectives of this project are to support the DOE direct coal liquefaction process development program and to improve the useful application of analytical chemistry to direct coal liquefaction process development. Independent analyses by well-established methods will be obtained of samples produced in direct coal liquefaction processes under evaluation by DOE. Additionally, analytical instruments and techniques which are currently underutilized for the purpose of examining coal-derived samples will be evaluated. The data obtained from this study will be used to help guide current process development and to develop an improved data base on coal and coal liquids properties. During this reporting period, CONSOL completed analyses of 81 feed and process stream samples from HTI bench Run CMSL-9. HTI liquefaction bench unit Run CMSL-9 (227-87) was operated with all-dispersed catalyst and Black Thunder Mine (Wyodak and Anderson seam) coal, with and without mixed plastics or high density polyethylene (HDPE) as coprocessing feedstocks. The dispersed catalysts used were Molyvan A and HTI`s iron catalyst, a sulfated iron hydroxide. Results are discussed in this report.

Robbins, G.A.; Brandes, S.D.; Winschel, R.A.; Burke, F.P.

1996-05-01T23:59:59.000Z

244

Advanced direct coal liquefaction concepts. Quarterly report, October 1, 1993--December 31, 1993  

DOE Green Energy (OSTI)

Six runs on the bench unit were successfully completed this quarter. The runs covered twenty five different operating conditions and yield periods, and involved 336 hours of operation. In the bench unit, increased temperature of first stage operation (410{degree}C) and direct addition of the powdered solid sodium aluminate to the feed as first stage catalyst improved both coal and carbon monoxide conversion. To achieve 90%+ overall coal conversion, temperatures of 430{degree}C+ were required in the second stage. Oil yields (pentane soluble liquid product) in excess of 65 wt % based on MAF Black Thunder coal, were achieved both with iron oxide/dimethyl disulfide and ammonium molybdate/carbon disulfide second stage catalysts. C{sub l}-C{sub 3} hydrogen gas yields were modest, generally 7-8 wt % on MAF coal, and overall hydrogen consumption (including first stage shift hydrogen) was in the order of 7-8 wt % on MAF coal. The ammonium molybdate catalyst system appeared to give slightly higher oil yields and hydrogen consumption, as was expected, but the differences may not be significant.

Berger, D.J.; Parker, R.J.; Simpson, P.L. [Canadian Energy Development, Inc., Edmonton, AB (Canada)

1993-12-31T23:59:59.000Z

245

Energy Blog | Department of Energy  

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

July 24, 2013 July 24, 2013 By applying pressure to the generator, one is able to generate about six nanoamperes of current and 400 millivolts of potential -- roughly a quarter of the voltage of a AAA battery and enough to flash a number on the small LCD screen. | Photo courtesy of Seung-Wuk Lee's lab at Lawrence Berkeley National Laboratory. R&D 100: Battery Technology Goes Viral Learn how Energy Department researchers are harnessing power from an unlikely source -- viruses. July 24, 2013 If you've ever heard the thunderous sound of a sonic boom, you've experienced the shock waves in the air created by an object traveling faster than the speed of sound. But what happens when an object travels faster than the speed of light? At Jefferson Laboratory, construction is underway to upgrade the Continuous Electron Beam Accelerator Facility (CEBAF) and the CEABF Large Acceptance Spectrometer (CLAS12) at Hall B. During the experiments, the accelerator will shoot electrons at speeds faster than the speed at which light travels in the same medium, creating shock waves that emit a blue light, known as Cherenkov light -- this light is equivalent to the sonic boom. By recording data from Cherenkov light, scientists will be able to map a nucleon's three-dimensional spin.

246

ARM facility captures rare tornado data [EVS News]  

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

ARM facility captures rare tornado data ARM facility captures rare tornado data June 13, 2013 Every spring, tornadoes thunder across five states, from Kansas to Texas, and alerts are common. However, by Monday, May 20, it was clear that this time the alert had a different urgency to it. The turn of events leading up to the EF-5 tornado that wreaked havoc in Moore, Oklahoma, provided a unique opportunity for scientists to sample the environment preceding a severe weather event. Read more about how EVS scientist, Donna Holdridge, supported the ARM program in the full article. Raw data from the additional radiosonde launches preceding the severe weather events of May 20 in Oklahoma. The blue line identifies the temperature, which decreases with increasing altitude. The red line is the dew point, the temperature at which the air is 100% saturated with its water vapor content. Where the dew point approaches the actual temperature, the air is nearing 100% relative humidity near the ground-ideal conditions for tornado events.

247

Photo of the Week: Faster than the Speed of Light | Department of Energy  

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

Photo of the Week: Faster than the Speed of Light Photo of the Week: Faster than the Speed of Light Photo of the Week: Faster than the Speed of Light July 24, 2013 - 2:00pm Addthis If you've ever heard the thunderous sound of a sonic boom, you've experienced the shock waves in the air created by an object traveling faster than the speed of sound. But what happens when an object travels faster than the speed of light? At Jefferson Laboratory, construction is underway to upgrade the Continuous Electron Beam Accelerator Facility (CEBAF) and the CEABF Large Acceptance Spectrometer (CLAS12) at Hall B. During the experiments, the accelerator will shoot electrons at speeds faster than the speed at which light travels in the same medium, creating shock waves that emit a blue light, known as Cherenkov light -- this light is equivalent to the sonic boom. By recording data from Cherenkov light, scientists will be able to map a nucleon's three-dimensional spin.

248

NEWTON, Ask a Scientist at Argonne National Labs  

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

Sound Pitch and Distance Travelled Sound Pitch and Distance Travelled Name: Chris Status: educator Grade: 4-5 Location: MI Country: USA Date: Winter 2011-2012 Question: Do high pitched sounds travel farther than low pitched sounds? Replies: Sorry Chris, it is the other way around. If you are near lightening you hear a crack or bang which is a high frequency sound. But far away from the lightening you hear thunder as a low pitch, rolling, boom. The high frequency sound from the crack you hear close up does not made it very far from the lightening (which is the cause of the noise). Hope this helps. R. W. "Mr. A." Avakian Quite the opposite. Low pitched sounds attenuate more slowly with distance. Fog-horns are an evolutionary example of the point. Of course, they are meant to operate in elevated humidity, which adds another loss factor. I will try to tell you more later. On the other hand, it is quite possible for high-pitched sounds to be _more_noticeable_ to a given being in a given noise background.

249

Recent News from the National Labs | Department of Energy  

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

24, 2013 24, 2013 By applying pressure to the generator, one is able to generate about six nanoamperes of current and 400 millivolts of potential -- roughly a quarter of the voltage of a AAA battery and enough to flash a number on the small LCD screen. | Photo courtesy of Seung-Wuk Lee's lab at Lawrence Berkeley National Laboratory. R&D 100: Battery Technology Goes Viral Learn how Energy Department researchers are harnessing power from an unlikely source -- viruses. July 24, 2013 If you've ever heard the thunderous sound of a sonic boom, you've experienced the shock waves in the air created by an object traveling faster than the speed of sound. But what happens when an object travels faster than the speed of light? At Jefferson Laboratory, construction is underway to upgrade the Continuous Electron Beam Accelerator Facility (CEBAF) and the CEABF Large Acceptance Spectrometer (CLAS12) at Hall B. During the experiments, the accelerator will shoot electrons at speeds faster than the speed at which light travels in the same medium, creating shock waves that emit a blue light, known as Cherenkov light -- this light is equivalent to the sonic boom. By recording data from Cherenkov light, scientists will be able to map a nucleon's three-dimensional spin.

250

Coal liquefaction process streams characterization and evaluation: The preliminary evaluation of the kinetics of coal liquefaction distillation resid conversion  

SciTech Connect

This study evaluated the use of a novel laboratory-scale batch reactor, designed by the University of Delaware, to study the kinetics of coal liquefaction resid reactivity. The short time batch reactor (STBR) is capable of conducting reactions at temperatures up to 450{degrees}C and pressures up to 2500 psi at well-defined reaction times from a few seconds to 30 min or longer. Sixty experiments were conducted with the STBR in this project. The products of the resid/tetralin/hydrogen reaction were separated by solubility, and several analytical procedures were used to evaluate the reaction products, including thermogravimetric analysis (TGA), gas chromatography (GC) and gas chromatography/mass spectrometry (GC/MS). Changes were monitored in the boiling ranges of the products, as a function of process conditions (time, temperature, and tetralin donor solvent-to-resid ratio), with and without catalysts. Two distillation resid samples were studied; Sample 1 is the resid of the second stage product stream from Wilsonville Run 259 which used Pittsburgh seam coal (Ireland mine) bituminous coal, and Sample 2 is the resid of the same streak from Wilsonville Run 260 which used Wyodak and Anderson (Black Thunder Mine) subbituminous coal. It was determined that the resid reactivity was different for the two samples studied. The results demonstrate that further development of this experimental method is warranted to empirically assess resid reactivity and to provide data for use in the construction of an empirical model of coal conversion in the direct liquefaction process.

Klein, M.T.; Calkins, W.H.; Huang, He [Delaware Univ., Newark, DE (United States). Center for Catalytic Science and Technology

1994-02-01T23:59:59.000Z

251

Advanced liquefaction using coal swelling and catalyst dispersion techniques. Quarterly technical progress report No. 7, April 1993--June 1993  

Science Conference Proceedings (OSTI)

The overall objective of this project is to develop a new approach for the direct liquefaction of coal to produce an all-distillate product slate at a sizable cost reduction over current technology. The approach integrates coal selection, pretreatment, coal swelling with catalyst impregnation, liquefaction, product recovery with characterization, alternate bottoms processing, and carrying out a technical assessment including an economic evaluation. The project is being carried out under contract to the United States Department of Energy. All three coals used in this study (Black Thunder, Burning Star bituminous, and Martin Lake lignite) are effectively swelled by a number of solvents. The most effective solvents are those having hetero-functionality. In addition, a synergistic effect has been demonstrated, in which solvent blends are more effective for coal swelling than the pure solvents alone. Therefore, it will be necessary to use only low levels of swelling agents and yet promote the impregnation of catalyst precursors. The rate of the impregnation of catalyst precursors into swollen coal increases greatly as the effectiveness of the solvent to swell the coal increases. This effect is also demonstrated by improved catalyst precursor impregnation with increased contact temperature. Laboratory- and bench-scale liquefaction experimentation is underway using swelled and catalyst impregnated coal samples. Higher coal conversions were observed for the SO{sub 2}-treated coal than the raw coal, regardless of catalyst type. Conversions of swelled coal were highest when Molyvan-L, molybdenum naphthenate, and nickel octoate, respectively, were added to the liquefaction solvent.

Curtis, C.W. [Auburn Univ., AL (United States); Chander, S. [Pennsylvania State Univ., University Park, PA (United States); Gutterman, C.

1994-09-01T23:59:59.000Z

252

Production of low-cost hydrogen  

DOE Green Energy (OSTI)

The overall objective of the proposed effort is to verify at the laboratory scale, the ability of the MTCI indirectly heated fluid-bed gasifier to economically produce a hydrogen-rich product gas from liquefaction by-product streams and from char produced in mild gasification processes. Specifically, the proposed effort is aimed at developing an experimental technology data base by defining the process characteristics that would be required for process integration into an overall liquefaction system. This would result in substantial decreases in the cost of hydrogen for the production of competitively priced coal-derived liquid fuels. During this quarter, shakedown tests of the reactor were completed. Subbituminous coals from Black Thunder mine and Eagle Butte mine were obtained for use in mild gasification to produce char. During the initial shakedown tests, it was determined that a new pulse combustor was needed. A pulse combustor with a large aerovalve was fabricated and tested. Three shakedown tests with limestone as the fluid-bed medium were carried out at temperature from 1450{degree}F to 1550{degree}F.

Not Available

1990-01-01T23:59:59.000Z

253

A CHARACTERIZATION AND EVALUATION OF COAL LIQUEFACTION PROCESS STREAMS  

DOE Green Energy (OSTI)

This is the Technical Progress Report for the fifteenth quarter of activities under DOE Contract No. DE-AC22-94PC93054. It covers the period January 1 through March 31, 1998. Described in this report are the following activities: (1) CONSOL characterized 41 process stream samples obtained from HTI Run PB-01 (227-90), in which Black Thunder Mine coal, Hondo VTB resid, municipal solid waste (MSW) plastics, and virgin plastics were co-liquefaction feedstocks with all-dispersed Fe and Mo catalysts. (2) A request was made for samples from the Nippon Coal Oil NEDOL pilot plant in Kashima, Japan. (3) Phenols were extracted from two samples of separator overhead oil from HTI Run PB-03 Periods 10A and 10B. The phenols were converted to ethylphenyl ethers, and the ethers were distilled to produce a sample within the diesel fuel boiling range. The ethers were mixed with diesel fuel to make 1%, 5%, 10%, and 20% solutions. The four mixtures and a control sample (0% ether) were tested for diesel fuel properties by Intertek Testing Services, Caleb Brett. (4) Computational studies related to the University of Delaware's resid conversion model were continued on the Hewlett Packard Apollo HP-735 RISC workstation at CONSOL R and D. The Structure Optimization Program and the Structure Once-Through Program were used to generate physicochemical properties and structure models for the 15 coal resid samples which have been under study.

G.A. Robbins; S.D. Brandes; D.J. Pazuchanics; D.G. Nichols; R.A. Winschel

1998-12-01T23:59:59.000Z

254

Partition Function of Spacetime  

E-Print Network (OSTI)

We consider a microscopic model of spacetime, where spacetime is assumed to be a specific graph with Planck size quantum black holes on its vertices. As a thermodynamical system under consideration we take a certain uniformly accelerating, spacelike two-surface of spacetime which we call, for the sake of brevity and simplicity, as {\\it acceleration surface}. Using our model we manage to obtain an explicit and surprisingly simple expression for the partition function of an acceleration surface. Our partition function implies, among other things, the Unruh and the Hawking effects. It turns out that the Unruh and the Hawking effects are consequences of a specific phase transition, which takes place in spacetime, when the temperature of spacetime equals, from the point of view of an observer at rest with respect to an acceleration surface, to the Unruh temperature measured by that observer. When constructing the partition function of an acceleration surface we are forced to introduce a quantity which plays the role of thermal energy of the surface. An interpretation of that quantity as energy in a normal manner yields Einstein's field equation with a vanishing cosmological constant for general matter fields.

Jarmo Makela

2008-10-27T23:59:59.000Z

255

Reflection and Transmission at the Apparent Horizon during Gravitational Collapse  

E-Print Network (OSTI)

We examine the wave-functionals describing the collapse of a self-gravitating dust ball in an exact quantization of the gravity-dust system. We show that ingoing (collapsing) dust shell modes outside the apparent horizon must necessarily be accompanied by outgoing modes inside the apparent horizon, whose amplitude is suppressed by the square root of the Boltzmann factor at the Hawking temperature. Likewise, ingoing modes in the interior must be accompanied by outgoing modes in the exterior, again with an amplitude suppressed by the same factor. A suitable superposition of the two solutions is necessary to conserve the dust probability flux across the apparent horizon, thus each region contains both ingoing and outgoing dust modes. If one restricts oneself to considering only the modes outside the apparent horizon then one should think of the apparent horizon as a partial reflector, the probability for a shell to reflect being given by the Boltzmann factor at the Hawking temperature determined by the mass contained within it. However, if one considers the entire wave function, the outgoing wave in the exterior is seen to be the transmission through the horizon of the interior outgoing wave that accompanies the collapsing shells. This transmission could allow information from the interior to be transferred to the exterior.

Cenalo Vaz; L. C. R. Wijewardhana

2010-07-22T23:59:59.000Z

256

Catalytic Two-Stage Liquefaction (CTSL{trademark}) process bench studies and PDU scale-up with sub-bituminous coal. Final report  

Science Conference Proceedings (OSTI)

Reported are the details and results of Laboratory and Bench-Scale experiments using sub-bituminous coal conducted at Hydrocarbon Research, Inc., under DOE Contract No. DE-AC22-88PC88818 during the period October 1, 1988 to December 31, 1992. The work described is primarily concerned with testing of the baseline Catalytic Two-Stage Liquefaction (CTSL{trademark}) process with comparisons with other two stage process configurations, catalyst evaluations and unit operations such as solid separation, pretreatments, on-line hydrotreating, and an examination of new concepts. In the overall program, three coals were evaluated, bituminous Illinois No. 6, Burning Star and sub-bituminous Wyoming Black Thunder and New Mexico McKinley Mine seams. The results from a total of 16 bench-scale runs are reported and analyzed in detail. The runs (experiments) concern process variables, variable reactor volumes, catalysts (both supported, dispersed and rejuvenated), coal cleaned by agglomeration, hot slurry treatments, reactor sequence, on-line hydrotreating, dispersed catalyst with pretreatment reactors and CO{sub 2}/coal effects. The tests involving the Wyoming and New Mexico Coals are reported herein, and the tests involving the Illinois coal are described in Topical Report No. 2. On a laboratory scale, microautoclave tests evaluating coal, start-up oils, catalysts, thermal treatment, CO{sub 2} addition and sulfur compound effects were conducted and reported in Topical Report No. 3. Other microautoclave tests are described in the Bench Run sections to which they refer such as: rejuvenated catalyst, coker liquids and cleaned coals. The microautoclave tests conducted for modelling the CTSL{trademark} process are described in the CTSL{trademark} Modelling section of Topical Report No. 3 under this contract.

Comolli, A.G.; Johanson, E.S.; Karolkiewicz, W.F.; Lee, L.K.T.; Stalzer, R.H.; Smith, T.O.

1993-03-01T23:59:59.000Z

257

Azimuthal variation of radiation of seismic energy from cast blasts  

SciTech Connect

As part of a series of seismic experiments designed to improve the understanding of the impact of mining blasts on verifying a Comprehensive Test Ban Treaty, a sixteen station network of three-component seismic sensors were deployed around a large cast shot in the Black Thunder Mine. The seismic stations were placed, where possible, at a range of 2.5 kilometers with a constant inter-station spacing of 22.5 degrees. All of the data were recorded with the seismometers oriented such that the radial component pointed to the middle point of the approximately 2 kilometer long shot. High quality data were recorded at each station. Data were scaled to a range of 2.5 kilometers and the sum of the absolute value of the vertical, radial, and transverse channels computed. These observations were used to construct radiation patterns of the seismic energy propagating from the cast shot. It is obvious that cast shots do not radiate seismic energy isotropically. Most of the vertical motion occurs behind the highwall while radial and transverse components of motion are enhanced in directions parallel to the highwall. These findings have implications for local (0.1 to 15 kilometer range) and possibly for regional (100 to 2,000 kilometer range) seismic observations of cast blasting. Locally, it could be argued that peak particle velocities could be scaled not only by range but also by azimuthal direction from the shot. This result implies that long term planning of pit orientation relative to sensitive structures could mitigate problems with vibration levels from future blasting operations. Regionally, the local radiation pattern may be important in determining the magnitude of large scale cast blasts. Improving the transparency of mining operations to international seismic monitoring systems may be possible with similar considerations.

Pearson, D.C.; Stump, B.W. [Los Alamos National Lab., NM (United States); Martin, R.L. [Thunder Basin Coal Co., Wright, WY (United States)

1996-12-31T23:59:59.000Z

258

An investigation of the role of water on retrograde/condensation reactions and enhanced liquefaction yields  

SciTech Connect

Changes in coal structure that may occur during coal drying will be measured in order to determine the effects of coal drying on its reactivity toward liquefaction. Different methods for coal drying will be investigated to determine if drying can be accomplished without destroying coal reactivity toward liquefaction, thereby making coal drying a relatively economical and efficient method for coal pretreatment. Coal drying methods will include conventional thermal drying, microwave drying and chemical drying at low temperature. State-of-the-art solid-state nuclear magnetic resonance (NMR) techniques using combined rotation and multiple pulse spectroscopy (CRAMPS) and cross polarization with magic-angle spinning (CP/MAS) will be employed: (1) to measures changes in coal structure brought about by the different methods of drying and by low temperature oxidation, and (2) to obtain direct measurements of changes in the aromatic hydrogen-to-carbon ratio of the solid/semisolid material formed or remaining during pretreatment and the initial stages of liquefaction. The objectives for this quarter were to begin coal drying experiments using thermal, microwave, and chemical methods, and to begin coal liquefaction experiments on the dried coals. Three additional coal samples have been acquired. These are a Black Thunder Mine coal acquired from Arco Coal Co, and a Texas subC and Illinois No. 6 hvC acquired from the DOE coal sample bank at Penn State. The samples are listed as DECS-1 and DECS-2, respectively in the PSU sample bank. The ultimate and proximate analyses for all the samples are given in Table 1. Work on each of the subtasks is described in separate paragraphs.

Miknis, F.P.

1993-04-01T23:59:59.000Z

259

Direct liquefaction proof-of-concept program: Bench Run 05 (227-97). Final report  

DOE Green Energy (OSTI)

This report presents the results Bench Run PB-05, conducted under the DOE Proof of Concept - Bench Option Program in direct coal liquefaction at Hydrocarbon Technologies, Inc. in Lawrenceville, New Jersey. Bench Run PB-05 was the fifth of the nine runs planned in the POC Bench Option Contract between the U.S. DOE and included the evaluation of the effect of using dispersed slurry catalyst in direct liquefaction of a high volatile bituminous Illinois No. 6 coal and in combined coprocessing of coal with organic wastes, such as heavy petroleum resid, MSW plastics, and auto-shredder residue. PB-05 employed a two-stage, back-mixed, slurry reactor system with an interstage V/L separator and an in-line fixed-bed hydrotreater. Coprocessing of waste plastics with Illinois No. 6 coal did not result in the improvement observed earlier with a subbituminous coal. In particular, decreases in light gas yield and hydrogen consumption were not observed with Illinois No. 6 coal as they were with Black Thunder Mine coal. The higher thermal severity during PB-05 is a possible reason for this discrepancy, plastics being more sensitive to temperatures (cracking) than either coal or heavy resid. The ASR material was poorer than MSW plastics in terms of increasing conversions and yields. HTI`s new dispersed catalyst formulation, containing phosphorus-promoted iron gel, was highly effective for the direct liquefaction of Illinois No. 6 coal under the reaction conditions employed; over 95% coal conversion was obtained, along with over 85% residuum conversion and over 73% distillate yields.

Comolli, A.G.; Pradhan, V.R.; Lee, T.L.K.; Karolkiewicz, W.F.; Popper, G.

1997-04-01T23:59:59.000Z

260

Hometown News Releases  

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

Publications Hometown News Releases News Releases issued in: 2011, 2010, 2009, 2008 October 18, 2013 NETL Researcher Honored with 2013 Federal Laboratory Consortium Award Morgantown, W.Va. - Dr. Stephen E. Zitney of the National Energy Technology Laboratory (NETL) has been awarded a Mid-Atlantic region Federal Laboratory Consortium (FLC) award for Excellence in Technology Transfer for his work on the 3D Virtual Energy Plant Simulator and Immersive Training System. October 18, 2013 NETL Researcher Honored with 2013 Federal Laboratory Consortium Award Albany, Ore. - Jeffrey Hawk of the National Energy Technology Laboratory (NETL) has been awarded a Far West region Federal Laboratory Consortium (FLC) award for Outstanding Technology Development for his work on Superior Heat Resistant Alloys through Controlled Homogenization.

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261

RHIC | Black Holes?  

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

Black Holes at RHIC? Black Holes at RHIC? Further discussion by Physicist Dmitri Kharzeev on why RHIC cannot produce a real gravitational black hole Black holes are among the most mysterious objects in the universe. The gravitational field of a black hole is so strong that Einstein's general relativity tells us that nothing, not even light, can escape from the black hole's interior. However, in 1974 physicist Stephen Hawking demonstrated that black holes must emit radiation once the quantum effects are included. According to quantum mechanics, the physical vacuum is bubbling with short-lived virtual particle-antiparticle pairs. Creation of a particle-antiparticle pair from the vacuum conflicts with energy conservation, but energy need not be conserved at short times in quantum mechanics, according to Heisenberg's

262

Water an Unusual Liquid; LCLS Provides New Insights | Stanford Synchrotron  

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

Water an Unusual Liquid; LCLS Provides New Insights Water an Unusual Liquid; LCLS Provides New Insights Wednesday, November 13, 2013 - 3:00pm SLAC, Redtail Hawk Conference Room 108A Anders Nilsson, SUNCAT The anomalous physical properties of water are responsible for sustaining much of life on earth; for example, water displays a higher heat capacity than common liquids and expands upon freezing. Some of these anomalous physical properties become dramatically enhanced upon supercooling below the freezing point. In particular, extrapolations of the thermal expansion coefficient, isothermal compressibility, heat capacity and correlation length can all be fitted with a power law divergence with the same apparent singularity temperature of about 228 K. Experiments on pure bulk water below about ~240 K have so far been difficult: water crystallization occurs

263

Nevada's 2nd congressional district: Energy Resources | Open Energy  

Open Energy Info (EERE)

2nd congressional district: Energy Resources 2nd congressional district: Energy Resources Jump to: navigation, search Equivalent URI DBpedia This article is a stub. You can help OpenEI by expanding it. This page represents a congressional district in Nevada. Registered Energy Companies in Nevada's 2nd congressional district Arete Power Inc Biodiesel Solutions Inc BlackHawk Fund Brady Power Partners Chapeau Inc dba BluePoint Energy Inc China Recycling Energy Corp CREG Collier Technologies Inc Constellation Operating Services ElectraTherm Inc ElectraTherm, Inc. Empire Geothermal Power LLC Geothermal Development Associates Geothermal Technical Partners Gradient Resources Kodali Inc Lumenergi Magma Energy NV Energy Sierra Pacific Resources NV Energy formerly Sierra Pacific Power Newcore Energy Inc OHm Geothermal Ormat Funding Corp

264

Meeting Minutes  

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

th th Environmental Management Quality Assurance Corporate Board Meeting Minutes September 13, 2010 - Augusta, GA Page 1 of 13 Note: Revised by-laws for the EM QA Corporate Board were approved including the resolution of comments from the last meeting. The revised by-laws are posted at http://www.em.doe.gov/Pages/QACorporateBoard.aspx. Voting Board Members in Attendance (general attendance sheet for the meeting is attached): Brian Anderson - Idaho Brenda Hawks - Oak Ridge Ray Corey - Richland Jack Craig - Savannah River Bud Danielson -Chief of Nuclear Safety T.J. Jackson - EMCBC Steven Krahn (chair) - Headquarters EM-20 Jack Zimmerman - Portsmouth/Paducah Bob Murray (vice-chair) - Headquarters EM-23 No Voting Member Present - Carlsbad

265

Final_Tech_Session_Schedule_and_Location.xls  

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

Analysis of In-Situ Stress Regime in the Alberta Basin, Canada, for Performance Assessment of CO 2 Geological Sequestration Sites Christopher D. Hawkes, University of Saskatchewan, Stefan Bachu and Kristine Haug, Alberta Energy and Utilities Board, and Adam W. Thompson, University of Saskatchewan, Canada CONFERENCE PROCEEDINGS FOURTH ANNUAL CONFERENCE ON CARBON CAPTURE AND SEQUESTRATION DOE/NETL May 2-5, 2005 ABSTRACT Oil and gas reservoirs and deep saline aquifers are primary candidates for long-term geological sequestration of greenhouse and acid gases. Risk assessment for sequestration projects must include predictions of sequestration zone performance. These performance assessments will guide the selection of sequestration sites and/or operating parameters, such as injection pressure and rate, that mitigate

266

Tough Times for the Muskrats  

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

Tough Times for the Muskrats Tough Times for the Muskrats Nature Bulletin No. 3 February 24, 1945 Forest Preserve District of Cook County Clayton F Smith, President Roberts Mann, Superintendent of Conservation TOUGH TIMES FOR THE MUSKRATS This has been a sorry year for the muskrats. The long drought, last summer and fall, dried up many of the smaller marshes and ponds where they had been living and forced them to migrate overland to new homes. Many undoubtedly were killed while enroute by mink, hawks, or dogs. Even the larger marshes and ponds were made smaller and more shallow by the drought and now this severe winter, with its long, bitter cold, has caused many of them to freeze solid to the very bottom; thus sealing the muskrats up in their lodges and preventing them from swimming around under the ice to get food.

267

Slide 1  

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

Detroit Edison's Advanced Detroit Edison's Advanced Implementation of A123's Community Energy Storage Systems for Grid Support (DE-OE0000229) Hawk Asgeirsson Principal Investigator November 3, 2010 Funded in part by the Energy Storage Systems Program of the U.S. Department Of Energy through National Energy Technology Laboratory Community Energy Storage * The project is a proof of concept of an aggregated Community Energy Storage (CES) system in a utility territory; demonstrating the following capabilities: - Voltage/VAR Support - Integration renewable generation - Islanding during outages - Frequency Regulation * Demonstrate the application of secondary-use EV batteries as CES devices. Identifying alternative applications for EV type batteries may accelerate the reduction of cost for electric vehicle batteries.

268

Making STEM Personal | Department of Energy  

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

Making STEM Personal Making STEM Personal Making STEM Personal March 29, 2013 - 3:51pm Addthis Occupations in science, technology, engineering, and mathematics (STEM) are among the fastest growing fields, offering well-paying opportunities to better explore, understand, and improve the world. To celebrate Women's History Month, DOE recently introduced an online Women @ Energy series that profiles DOE women involved in STEM., Included in the Women @ Energy series are OE's Assistant Secretary Patricia Hoffman and Carol Hawk who manages the Cybersecurity for Energy Delivery Systems Program. In her profile, Pat Hoffman talks about being inspired by her aunt who worked in the scientific field, a woman who excited Pat's imagination: "She told me about all of the different materials that were going to be

269

Energy Secretary Chu Announces Montana Schools Win National Student  

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

Montana Schools Win National Student Montana Schools Win National Student Efficiency Competition Energy Secretary Chu Announces Montana Schools Win National Student Efficiency Competition May 2, 2012 - 3:05pm Addthis WASHINGTON, D.C. - Secretary of Energy Steven Chu today announced the winners of the America's Home Energy Education Challenge, a national student competition designed to encourage students and their families to take action to start saving money by saving energy. A team of students from five schools in rural Carter County, Montana - Alzeda Elementary School, Carter County High School, Ekalaka Elementary School (K-8th grade), Hammond School (K-8th grade) and Hawks Home School - was declared the national winner for successfully reducing their home energy use by 3.4 percent, working with local utility companies and the community,

270

The Entire Zoology Archive  

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

Zoology Archives Zoology Archives Zoology Archives, Since May 2000 Table of Contents: Bat Pets Insect Bites Earthworms and Soil Wren House Jumping Insects Killdeer Nesting Intolerance or Allergy to Milk Art and Mitosis Injured Animals Junebug Food Swans and Eggs Cat Eye Pupils Cob Web Origin Bee Sting Venom Appendix Function Stingrays Arm Pit Hair Function Deer Senses Tick Safety Palefaced Hornets and Risk Punnett Square Lettering Tick Types Hornet Behavior King Snakes Piercing Cartilidge American Kestrel Hawk Cottonmouths in Illinois Bees and flight Big Woodpeckers Crayfish Burrows June Bugs, Wasps and Hornets Waterdogs Moths and Metamorphosis Red Wasp Food Waterdogs Swan Eggs Dove Nesting Deer at Night Illinois Snakes Worm Teeth Housefly Napping Raising Ducks Scorpion Prevention Multiple Moths Young Birds

271

Microsoft Word - Agenda 071910.doc  

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

Cybersecurity for Energy Delivery Systems Cybersecurity for Energy Delivery Systems 2010 Peer Review July 20-22, 2010 Westin Alexandria ● Alexandria, VA Tuesday, July 20 - Day 1 Time Activity Host/Presenter 7:30 - 8:30 am Registration and Continental Breakfast 8:30 - 8:45 am Welcome from Program Manager Carol Hawk 8:45 - 9:00 am Introductions and Instructions Katie Jereza Best Practices/Standards Development 9:00 - 9:30 am Advanced Security Acceleration Project for the Smart Grid (ASAP-SG) Oak Ridge National Laboratory 9:30 - 10:00 am Lemnos Interoperable Security EnerNex Corporation 10:00 - 10:30 am Trustworthy Wireless for Critical Infrastructure Sites Oak Ridge National Laboratory 10:30 - 11:00 am BREAK Best Practice Design/Configuration

272

Minutes Ops mtg 080511  

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

August 5, 2011 August 5, 2011 10:30 - 11:30 AM Minutes Attendees: Tom McVeigh, Gregg Penn, Abdi Salehi, Pat Thomas, Herb Toor, Csaba Toth, Weyland Wong 1. ES&H News and Lessons Learned: * Accident Statistics - A review of LBNL accident statistics for June 2011 reveals several slip/trip/fall accidents, including: i. An administrator fell while walking across a parking lot, ii. A project manager tripped while walking up a wooden stairs, iii. A custodian sprained an ankle while stepping on the edge of a manhole cover, iv. A guest tripped over a fire hose that was stretched across a driveway. v. A research associate was startled by a hawk and fell off a sidewalk, vi. A writer/editor lost footing on a tapered curb near a bus stop, vii. A laborer lost footing on slippery concrete while cleaning a catch

273

Step-by-Step Instructions  

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

Iowa based Iowa based upon the simple prescriptive option of the 2012 IECC. It does not provide a guarantee for meeting the IECC. This guide is not designed to reflect the actual energy code, with amendments, if any, adopted in Iowa and does not, therefore, provide a guarantee for meeting the state energy code. For details on the energy code adopted by Iowa, including how it may differ from the IECC, please contact your local building code official. Additional copies of this guide are available on www.reca-codes.com. CLIMATE ZONE 6 Allamakee Clay Hancock Palo Alto Black Hawk Clayton Hardin Plymouth Bremer Delaware Howard Pocahontas Buchanan Dickinson Humboldt Sac Buena Vista Emmet Ida Sioux Butler Fayette Kossuth Webster Calhoun Floyd Lyon Winnebago Cerro Gordo Franklin

274

Organic thin film prehistory: looking towards solution phase aggregation |  

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

Organic thin film prehistory: looking towards solution phase aggregation Organic thin film prehistory: looking towards solution phase aggregation Wednesday, November 6, 2013 - 3:00pm SLAC, Redtail Hawk Conference Room 108A Christopher Tassone, SSRL Polymer bulk heterojunction (BHJ) solar cells have attracted significant attention in industry and academia because of their potential for achieving large-area, light-weight, and flexible photovoltaic devices through cost-effective solution deposition techniques. These devices consist of a blend of an absorbing polymer and an electron accepting fullerene, the molecular packing and phase segregation of which heavily influence power conversion efficiency by effecting important processes such as exciton splitting, charge transport, and recombination. Understanding and utilization of molecular interactions to predicatively control the

275

Secretary Chu Speaks at Washington Post Live | Department of Energy  

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

Chu Speaks at Washington Post Live Chu Speaks at Washington Post Live Secretary Chu Speaks at Washington Post Live November 3, 2011 - 9:12am Addthis Secretary Chu Secretary Chu Former Secretary of Energy Secretary Chu's remarks, as prepared for delivery, at the Washington Post Smart Energy Conference. Thank you, Mary [Jordan], for that kind introduction. While the focus of this conference is on the future of energy, I want to start with some lessons from America's past. On a windy day at Kitty Hawk on December 17, 1903, the Wright Brothers launched the world's first powered airplane to achieve human flight - and with it, a whole new industry. For the next several years, they led the world. What is less appreciated is that the United States lost the technology lead in airplanes by the beginning of World War I. Although the

276

Bees dying after a sting  

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

Bees dying after a sting Bees dying after a sting Name: Mrs. Collins' class! Status: N/A Age: N/A Location: N/A Country: N/A Date: N/A Question: My fourth grade class would like to know why do bees die after they sting someone? Does this happen to all types of bees? Replies: Tim, Bees, wasps, and ants all belong to the order _Hymenoptera_ and are the only insects with "stingers" which are really the ovipositors of adult females. Some species have stingers that are barbed and remain in the wound. I've heard that honey bees are the only ones that die after stinging you, but I could not confirm this in any reference. Jade Hawk Just to clarify a bit..... When the stinger or ovipositor is left, the insect has torn off a part of its abdomen and cannot survive the damage. Ric

277

Property:ProjectTechnology | Open Energy Information  

Open Energy Info (EERE)

ProjectTechnology ProjectTechnology Jump to: navigation, search Property Name ProjectTechnology Property Type Page Has Default form Marine and Hydrokinetic Technology Pages using the property "ProjectTechnology" Showing 25 pages using this property. (previous 25) (next 25) M MHK Projects/40MW Lewis project + MHK Technologies/Oyster + MHK Projects/ADM 3 + MHK Technologies/Wavebob + MHK Projects/ADM 4 + MHK Technologies/Wavebob + MHK Projects/AW Energy EMEC + MHK Technologies/Wave Roller + MHK Projects/Alaska 35 + MHK Technologies/Ocean +, MHK Technologies/Kensington + MHK Projects/BW2 Tidal + MHK Technologies/RED HAWK + MHK Projects/BioSTREAM Pilot Plant + MHK Technologies/bioSTREAM + MHK Projects/Bluemill Sound + MHK Technologies/Exim + MHK Projects/Bondurant Chute + MHK Technologies/SmarTurbine +

278

Step-by-Step Instructions  

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

Iowa. The requirements in the 2009 IECC Iowa. The requirements in the 2009 IECC are the same for windows used in new buildings, remodeling & additions to existing buildings, and as replacements of existing windows. Step-by-Step Instructions 1. Using the climate zone map or table, match the jurisdiction to the appropriate IECC climate zone. Use the "IECC Prescriptive Window Energy Efficiency Requirements" (on the back of this sheet) to determine the window performance requirements associated with the climate zone. 2. Construct the home with windows that have area weighted average U-factor and SHGC values less than or equal to the values for the climate zone and meet the code maximum air leakage requirements. IECC CLIMATE ZONE 6 Allamakee Clay Hancock Palo Alto Black Hawk Clayton Hardin Plymouth

279

Comparison of Three Ni-Hard I Alloys  

Office of Scientific and Technical Information (OSTI)

Comparison of Three Ni-Hard I Alloys Comparison of Three Ni-Hard I Alloys Ö. N. Do-an 1 , J.A. Hawk 1 , and J.Rice 2 1 U.S. Department of Energy, Albany Research Center, Albany, Oregon 2 Texaloy Foundry Co., Inc., Floresville, Texas Keywords: Ni-Hard white irons, Bainite, Martensite, Austenite, Abrasion resistant iron Abstract This report documents the results of an investigation which was undertaken to reveal the similarities and differences in the mechanical properties and microstructural characteristics of three Ni-Hard I alloys. One alloy (B1) is ASTM A532 class IA Ni-Hard containing 4.2 wt. pct. Ni. The second alloy (B2) is similar to B1 but higher in Cr, Si, and Mo. The third alloy (T1) also falls in the same ASTM specification, but it contains 3.3 wt. pct. Ni. The alloys were evaluated in both as-cast and

280

DOE Solar Decathlon: New Zealand: Victoria University of Wellington  

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

New Zealand: Victoria University of Wellington New Zealand: Victoria University of Wellington Even before it was reassembled at West Potomac Park in Washington, D.C., Victoria University of Wellington's entry in the U.S. Department of Solar Decathlon 2011, First Light, had been sold at auction. However, the buyer's plans changed, and the house was offered for sale again. Today, First Light is settled in a stunning location in the seaside village of Waimarama, Hawkes Bay, New Zealand, and is available for rent as short-stay holiday accommodations. First Light was inspired by the traditional New Zealand holiday home-the "Kiwi bach," and it won third place overall in Solar Decathlon 2011. It placed first in the Engineering Contest and second in the Architecture Contest. It was also featured in Air New Zealand's inflight magazine, Kia

Note: This page contains sample records for the topic "thunder hawk mc734" 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

The Next Challenge in X-Ray Science: Control of Resonant Electronic  

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

The Next Challenge in X-Ray Science: Control of Resonant Electronic The Next Challenge in X-Ray Science: Control of Resonant Electronic Processes Wednesday, September 11, 2013 - 3:00pm SLAC, Redtail Hawk Conference Room 108A Joachim Stöhr, LCLS My talk will give a historic perspective of the revolutionary science that was enabled by the advent of high power sources of coherent electromagnetic radiation and the implications for future scientific opportunities with x-ray free electron lasers (X-FELs). The historical journey starts with the development of radar microwave sources in the 1940s that fueled the development of nuclear magnetic resonance (NMR) techniques which by now have led to 6 Nobel Prizes. The theoretical description of NMR as coherent processes between nuclear states by Rabi and Bloch also provided the theoretical basis for the optical laser and its applications. Over the last

282

NREL: News Feature - Middle Schoolers Shine in Electric Car Races  

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

Middle Schoolers Shine in Electric Car Races Middle Schoolers Shine in Electric Car Races May 24, 2013 In this photo, a boy grins widely as he holds a yellow folder over his model solar car. In the background are several black neoprene tracks and other middle-school students awaiting the starting signal. An adult race judge holds her hand in the air, signaling that everything is ready for the start of the race. Enlarge image Xavier Urquijo from Summit Ridge Middle School in Littleton waits for the start signal to lift the folder covering the solar panel on his team's car, "Knight Hawk." His team was one of 97 from 28 Colorado middle schools racing solar and lithium-ion powered vehicles they designed and built themselves at NREL's 2013 Junior Solar Sprint and Lithium-Ion Battery car competitions on May 18.

283

Secretary Chu Speaks at Washington Post Live | Department of Energy  

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

Speaks at Washington Post Live Speaks at Washington Post Live Secretary Chu Speaks at Washington Post Live November 3, 2011 - 9:12am Addthis Secretary Chu Secretary Chu Former Secretary of Energy Secretary Chu's remarks, as prepared for delivery, at the Washington Post Smart Energy Conference. Thank you, Mary [Jordan], for that kind introduction. While the focus of this conference is on the future of energy, I want to start with some lessons from America's past. On a windy day at Kitty Hawk on December 17, 1903, the Wright Brothers launched the world's first powered airplane to achieve human flight - and with it, a whole new industry. For the next several years, they led the world. What is less appreciated is that the United States lost the technology lead in airplanes by the beginning of World War I. Although the

284

Energy Storage Systems 2010 Update Conference Presentations - Day 2,  

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

3 3 Energy Storage Systems 2010 Update Conference Presentations - Day 2, Session 3 The U.S. DOE Energy Storage Systems Program (ESS) conducted a record-breaking Update Conference at the Washington DC Marriott Hotel on Nov. 2 - 4, 2010, with more than 500 attendees. The 2010 agenda reflected increased national interest in energy storage issues. The 3-day conference included 11 sessions plus a poster session on the final day. Presentations from the third session of Day 2, chaired by NETL's Ron Staubly, are below. ESS 2010 Update Conference - Detroit Edison's Advanced Implementatin of A123's Community ESS for Grid Support - Hawk Asgeirsson, DTE.pdf ESS 2010 Update Conference - Compressed Air Energy Storage (CAES) - Hal LaFlash, PG&E.pdf ESS 2010 Update Conference - Isothermal Compressed Air Energy Storage - Dax

285

Cyber Security Summer School: Lessons for the Modern Grid | Department of  

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

Cyber Security Summer School: Lessons for the Modern Grid Cyber Security Summer School: Lessons for the Modern Grid Cyber Security Summer School: Lessons for the Modern Grid June 20, 2011 - 4:34pm Addthis Carol Hawk Program Manager, Cyber Security for Energy Delivery Systems What does this mean for me? Computer systems do more than store and share information. They help control our traffic lights, trains and specifically, our electric grid -- tasks for which continuous function is the primary concern. Protecting control systems on the grid from cyber attack requires a completely different approach to cyber security than information technology systems. The Cyber Summer School gave aspiring attendees a practical understanding of the connection between power systems and computer science required to secure a clean, reliable energy future.

286

Spencer Chetnical Ccmpny  

Office of Legacy Management (LM)

-146 -146 I . . :, ~70-340 : .;, _. Spencer Chetnical Ccmpny &Q&t Building .:. /.: : Xensas City, Hiosouri .,i Attention: &.N~,~-l~ ~.I_ .z ,%;,.::.r .~'..; ,,., ,. : 1~. wt1-*: :,..: .,..' ..,,/ : f ,.,,. :;Lil~~.+ A,;; ;.,,I ~'~&:,.,3~ :;~ .: Thts refers to thr'iampactieo ckoducted.~~May 2 - 5, 1961, of activitiias at your~hawk~orlc8, Pfttsburg,~a;ansas, lic8msed under Source HaSerial Lieeme.Ho.C-4352 and Special Nuclear Material LiCans8 x011. 5xX-154 and a-329. ;. ; ., .,., :_: ,.,, .: : : .,. It appaars that certain of your ac&tiea were nit condkted & fgll canplian~e with a conditiw of a licenaa and.the raquiremeota of the AX's "Standard8 for Protection Against Radiation." Part20, Tit18 10, .cOd8 Of Fedetal %S&ationS, in. that:

287

Energy Storage Systems 2010 Update Conference Presentations - Day 2,  

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

3 3 Energy Storage Systems 2010 Update Conference Presentations - Day 2, Session 3 The U.S. DOE Energy Storage Systems Program (ESS) conducted a record-breaking Update Conference at the Washington DC Marriott Hotel on Nov. 2 - 4, 2010, with more than 500 attendees. The 2010 agenda reflected increased national interest in energy storage issues. The 3-day conference included 11 sessions plus a poster session on the final day. Presentations from the third session of Day 2, chaired by NETL's Ron Staubly, are below. ESS 2010 Update Conference - Detroit Edison's Advanced Implementatin of A123's Community ESS for Grid Support - Hawk Asgeirsson, DTE.pdf ESS 2010 Update Conference - Compressed Air Energy Storage (CAES) - Hal LaFlash, PG&E.pdf ESS 2010 Update Conference - Isothermal Compressed Air Energy Storage - Dax

288

Scalar-tensor gravitation and the Bakry-Emery-Ricci tensor  

E-Print Network (OSTI)

The Bakry-Emery generalized Ricci tensor arises in scalar-tensor gravitation theories in the conformal gauge known as the Jordan frame. Recent results from the mathematics literature show that standard singularity and splitting theorems that hold when an energy condition is applied in general relativity also hold when that energy condition is applied to the Bakry-Emery tensor. We show here that a direct consequence is that the Hawking-Penrose singularity theorem and the timelike splitting theorem hold for scalar-tensor theory in the Jordan frame. As examples, we consider dilaton gravity (including totally anti-symmetric torsion) and the Brans-Dicke family of scalar-tensor theories. For Brans-Dicke theory the theorems do not extend to cover the entire space of values of the Brans-Dicke family parameter omega, and so may fail to hold for omegaJordan frame and do not split as a Riemannian product.

E Woolgar

2013-02-07T23:59:59.000Z

289

Enhanced Geometry Fluctuations in Minkowski and Black Hole Spacetimes  

E-Print Network (OSTI)

We will discuss selected physical effects of spacetime geometry fluctuations, especially the operational signatures of geometry fluctuations and their effects on black hole horizons. The operational signatures which we discuss involve the effects of the fluctuations on images, and include luminosity variations, spectral line broadening and angular blurring. Our main interest will be in black hole horizon fluctuations, especially horizon fluctuations which have been enhanced above the vacuum level by gravitons or matter in squeezed states. We investigate whether these fluctuations can alter the thermal character of a black hole. We find that this thermal character is remarkably robust, and that Hawking's original derivation using transplanckian modes does not seem to be sensitive even to enhanced horizon fluctuations.

R. T. Thompson; L. H. Ford

2008-02-12T23:59:59.000Z

290

Exact noise kernel for quantum fields in static de Sitter and conformally-flat spacetimes  

E-Print Network (OSTI)

We compute exact expressions of the noise kernel, defined as the expectation value of the symmetrized connected stress energy bitensor, for conformally-invariant scalar fields with respect to the conformal vacuum, valid for an arbitrary separation (timelike, spacelike and null) of points in a class of conformally-flat spacetimes. We derive explicit expressions for the noise kernel evaluated in the static de Sitter coordinates with respect to the Gibbons-Hawking vacuum and analyze the behavior of the noise kernel in the region near the cosmological horizon. We develop a quasi-local expansion near the cosmological horizon and compare it with the exact results. This gives insight into the likely range of validity of the quasi-local approximation expressions for the noise kernel for the conformally invariant scalar field in Schwarzschild spacetime which are given in PHYSICAL REVIEW D{\\bf 85}, 044037 (2012).

Jason D. Bates; Hing-Tong Cho; Paul R. Anderson; B. L. Hu

2013-01-11T23:59:59.000Z

291

Entropy of singularities in self-gravitating radiation  

E-Print Network (OSTI)

The Bekenstein-Hawking entropy suggests that thermodynamics is an intrinsic ingredient of gravity. Here, we explore the idea that requirements of thermodynamic consistency could determine the gravitational entropy in other set-ups. We implement this idea in a simple model: static, spherically symmetric solutions to Einstein's equations corresponding to self-gravitating radiation. We find that the principle of maximum entropy provides a consistent thermodynamic description of the system, only if the entropy includes a contribution from the spacetime singularities that appear in the solutions of Einstein's equations. The form of the singularity entropy is stringently constrained from consistency requirements, so that the existence of a simple expression satisfying these constraints is highly non-trivial, and suggests of a fundamental origin. We find that the system is characterized by three equilibrium phases, and we conduct a preliminary investigation of the associated phase transitions. These results demonstrate the point that gravitational entities other than horizons are endowed with thermodynamic properties.

Charis Anastopoulos; Ntina Savvidou

2011-03-20T23:59:59.000Z

292

Utilizing Standing Ultrasonic Waves to Harvest Microalgae from a Fluid Suspension  

E-Print Network (OSTI)

As a result of dwindling supplies of fossil fuels and increasing environmental concerns significant research is being conducted in the United States and throughout the world in search of a new, abundant source of transportation fuel. One such source is biodiesel derived from microalgae; however, separating microalgal particles from the fluid medium where they are cultivated on an economically feasible scale presents a substantial challenge. Methods like sedimentation and flocculation are highly timeconsuming, and centrifugation requires significant energy input and frequent repairs. Here, the ultrasonic cell separation techniques employed by Jeremy J. Hawkes and others are applied to the specific case of separating microalgae from a fluid medium. Further, the design and fabrication of a filtration apparatus using this technology is documented along with a recommended test procedure.

Loveless, Kolin, 1986-

2010-05-01T23:59:59.000Z

293

Electron-positron pairs production in a macroscopic charged core  

E-Print Network (OSTI)

Classical and semi-classical energy states of relativistic electrons bounded by a massive and charged core with the charge-mass-radio Q/M and macroscopic radius R_c are discussed. We show that the energies of semi-classical (bound) states can be much smaller than the negative electron mass-energy (-mc^2), and energy-level crossing to negative energy continuum occurs. Electron-positron pair production takes place by quantum tunneling, if these bound states are not occupied. Electrons fill into these bound states and positrons go to infinity. We explicitly calculate the rate of pair-production, and compare it with the rates of electron-positron production by the Sauter-Euler-Heisenberg-Schwinger in a constant electric field. In addition, the pair-production rate for the electro-gravitational balance ratio Q/M = 10^{-19} is much larger than the pair-production rate due to the Hawking processes.

Ruffini, Remo

2011-01-01T23:59:59.000Z

294

Electron-positron pairs production in a macroscopic charged core  

E-Print Network (OSTI)

Classical and semi-classical energy states of relativistic electrons bounded by a massive and charged core with the charge-mass-radio Q/M and macroscopic radius R_c are discussed. We show that the energies of semi-classical (bound) states can be much smaller than the negative electron mass-energy (-mc^2), and energy-level crossing to negative energy continuum occurs. Electron-positron pair production takes place by quantum tunneling, if these bound states are not occupied. Electrons fill into these bound states and positrons go to infinity. We explicitly calculate the rate of pair-production, and compare it with the rates of electron-positron production by the Sauter-Euler-Heisenberg-Schwinger in a constant electric field. In addition, the pair-production rate for the electro-gravitational balance ratio Q/M = 10^{-19} is much larger than the pair-production rate due to the Hawking processes.

Remo Ruffini; She-Sheng Xue

2011-06-24T23:59:59.000Z

295

Statistical entropy of the Schwarzschild black hole  

E-Print Network (OSTI)

We derive the statistical entropy of the Schwarzschild black hole by considering the asymptotic symmetry algebra near the $\\cal{I^{-}}$ boundary of the spacetime at past null infinity. Using a two-dimensional description and the Weyl invariance of black hole thermodynamics this symmetry algebra can be mapped into the Virasoro algebra generating asymptotic symmetries of anti-de Sitter spacetime. Using lagrangian methods we identify the stress-energy tensor of the boundary conformal field theory and we calculate the central charge of the Virasoro algebra. The Bekenstein-Hawking result for the black hole entropy is regained using Cardy's formula. Our result strongly supports a non-local realization of the holographic principle

Mariano Cadoni

2005-11-09T23:59:59.000Z

296

Microscopic entropy of nondilatonic branes: A 2D approach  

SciTech Connect

We investigate nondilatonic p-branes in the near-extremal, near-horizon regime. A two-dimensional gravity model, obtained from dimensional reduction, gives an effective description of the brane. We show that the AdS{sub p+2}/CFT{sub p+1} correspondence at finite temperature admits an effective description in terms of a AdS{sub 2}/CFT{sub 1} duality endowed with a scalar field, which breaks the conformal symmetry and generates a nonvanishing central charge. The entropy of the CFT{sub 1} is computed using Cardy formula. Fixing in a natural way a free, dimensionless, parameter introduced in the model by a renormalization procedure, we find exact agreement between the CFT{sub 1} entropy and the Bekenstein-Hawking entropy of the brane.

Cadoni, Mariano; Serra, Nicola [Dipartimento di Fisica, Universita di Cagliari, and INFN sezione di Cagliari, Cittadella Universitaria 09042 Monserrato (Italy)

2004-12-15T23:59:59.000Z

297

Entanglement entropy of two-dimensional Anti-de Sitter black holes  

E-Print Network (OSTI)

Using the AdS/CFT correspondence we derive a formula for the entanglement entropy of the anti-de Sitter black hole in two spacetime dimensions. The leading term in the large black hole mass expansion of our formula reproduces exactly the Bekenstein-Hawking entropy S_{BH}, whereas the subleading term behaves as ln S_{BH}. This subleading term has the universal form typical for the entanglement entropy of physical systems described by effective conformal fields theories (e.g. one-dimensional statistical models at the critical point). The well-known form of the entanglement entropy for a two-dimensional conformal field theory is obtained as analytic continuation of our result and is related with the entanglement entropy of a black hole with negative mass.

Mariano Cadoni

2007-04-02T23:59:59.000Z

298

Brane World States from a Generalized Chaplygin Gas  

SciTech Connect

We consider the hypothesis that the transition to an accelerated period in the current universe involves a quantum mechanical process. We identify a minisuperspace configuration with two Lorentzian sectors, separated by a classically forbidden region. The Hartle-Hawking and Vilenkin wave functions are computed, together with the transition amplitudes towards the accelerating epoch. Furthermore, it is found that for specific initial conditions, the parameters characterizing the generalized Chaplygin gas become related through an expression involving an integer n. We also introduce a phenomenological association between some brane world scenarios and a FRW minisuperspace cosmology with a generalized Chaplygin gas. Results suggest that the brane tension would become related to generalized Chaplygin gas parameters through another expression involving an integer.

Bouhmadi-Lopez, Mariam [ICG, University of Portsmouth, Mercantile House, Hampshire Terrace, Portsmouth PO1 2EG (United Kingdom); Vargas Moniz, Paulo [Phys. Dept., UBI, 6200 Covilha, (Portugal); CENTRA/IST. Lisbon (Portugal)

2004-11-17T23:59:59.000Z

299

Wildlife studies on the Hanford Site: 1993 Highlights report  

Science Conference Proceedings (OSTI)

The Pacific Northwest Laboratory (PNL) Wildlife Resources Monitoring Project was initiated by DOE to track the status of wildlife populations to determine whether Hanford operations affected them. The project continues to conduct a census of wildlife populations that are highly visible, economically or aesthetically important, and rare or otherwise considered sensitive. Examples of long-term data collected and maintained through the Wildlife Resources Monitoring Project include annual goose nesting surveys conducted on islands in the Hanford Reach, wintering bald eagle surveys, and fall Chinook salmon redd (nest) surveys. The report highlights activities related to salmon and mollusks on the Hanford Reach of the Columbia River; describes efforts to map vegetation on the Site and efforts to survey species of concern; provides descriptions of shrub-steppe bird surveys, including bald eagles, Canada geese, and hawks; outlines efforts to monitor mule deer and elk populations on the Site; and describes development of a biological database management system.

Cadwell, L.L. [ed.

1994-04-01T23:59:59.000Z

300

Quasi-Local Energy in Loop Quantum Gravity  

E-Print Network (OSTI)

Although there is no known meaningful notion of the energy density of the gravitational field in general relativity, a few notions of quasi-local energy of gravity associated to extended but finite domains have been proposed. In this paper, the notions of quasi-local energy are studied in the framework of loop quantum gravity, in order to see whether these notions can be carried out at quantum level. Two basic quasi-local geometric quantities are quantized, which lead to well-defined operators in the kinematical Hilbert space of loop quantum gravity. We then use them as basic building blocks to construct different versions of quasi-local energy operators. The operators corresponding to Brown-York energy, Liu-Yau energy, Hawking energy, and Geroch energy are obtained respectively. The virtue of the Geroch energy operator is beneficial for us to derive a rather general entropy-area relation and thus a holographic principle from loop quantum gravity.

Jinsong Yang; Yongge Ma

2008-12-18T23:59:59.000Z

Note: This page contains sample records for the topic "thunder hawk mc734" 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

Quasi-Local Energy in Loop Quantum Gravity  

E-Print Network (OSTI)

Although there is no known meaningful notion of the energy density of the gravitational field in general relativity, a few notions of quasi-local energy of gravity associated to extended but finite domains have been proposed. In this paper, the notions of quasi-local energy are studied in the framework of loop quantum gravity, in order to see whether these notions can be carried out at quantum level. Two basic quasi-local geometric quantities are quantized, which lead to well-defined operators in the kinematical Hilbert space of loop quantum gravity. We then use them as basic building blocks to construct different versions of quasi-local energy operators. The operators corresponding to Brown-York energy, Liu-Yau energy, Hawking energy, and Geroch energy are obtained respectively. The virtue of the Geroch energy operator is beneficial for us to derive a rather general entropy-area relation from loop quantum gravity.

Yang, Jinsong

2008-01-01T23:59:59.000Z

302

Quantum gravity effects in the Kerr spacetime  

Science Conference Proceedings (OSTI)

We analyze the impact of the leading quantum gravity effects on the properties of black holes with nonzero angular momentum by performing a suitable renormalization group improvement of the classical Kerr metric within quantum Einstein gravity. In particular, we explore the structure of the horizons, the ergosphere, and the static limit surfaces as well as the phase space available for the Penrose process. The positivity properties of the effective vacuum energy-momentum tensor are also discussed and the 'dressing' of the black hole's mass and angular momentum are investigated by computing the corresponding Komar integrals. The pertinent Smarr formula turns out to retain its classical form. As for their thermodynamical properties, a modified first law of black-hole thermodynamics is found to be satisfied by the improved black holes (to second order in the angular momentum); the corresponding Bekenstein-Hawking temperature is not proportional to the surface gravity.

Reuter, M. [Institute of Physics, University of Mainz, Staudingerweg 7, D-55099 Mainz (Germany); Tuiran, E. [Departamento de Fisica, Universidad del Norte, Km 5 via a Puerto Colombia, AA-1569 Barranquilla (Colombia)

2011-02-15T23:59:59.000Z

303

Statistical Physics of Dark and Normal Matter Distribution in Galaxy Formation : Dark Matter Lumps and Black Holes in Core and Halo of Galaxy  

E-Print Network (OSTI)

In unified field theory the cosmological model of the universe has supersymmetric fields. Supersymmetric particles as dark and normal matter in galaxy clusters have a phase separation. Dark matter in halos have a statistical physics equation of state. Neutralino particle gas with gravitation can have a collapse of dark matter lumps. A condensate phase due to boson creation by annhillation and exchange can occur at high densities. The collapse of the boson condensate, including neutralinos, into the Schwarzschild radius creates dark matter black holes. Microscopic dark matter black holes can evaporate with Hawking effect giving gamma ray bursts and create a spectrum of normal particles. The phase separation of normal and dark matter in galaxy clusters and inside galaxies is given by statistical physics.

Ajay Patwardhan

2008-05-15T23:59:59.000Z

304

Constructed wetlands for municipal solid waste landfill leachate treatment. Final report  

SciTech Connect

In 1989, the US Geological Survey and Cornell University, in cooperation with the New York State Energy Research and Development Authority and the Tompkins County Solid Waste Department, began a three-year study at a municipal solid-waste landfill near Ithaca, New York, to test the effectiveness of leachate treatment with constructed wetlands and to examine the associated treatment processes. Specific objectives of the study were to examine: treatment efficiency as function of substrate composition and grain size, degree of plant growth, and seasonal changes in evapotranspiration rates and microbial activity; effects of leachate and plant growth on the hydraulic characteristics of the substrate; and chemical, biological, and physical processes by which nutrients, metals, and organic compounds are removed from leachate as it flows through the substrate. A parallel study at a municipal solid-waste landfill near Fenton, New York was conducted by researchers at Cornell University, Ithaca College, and Hawk Engineering (Trautmann and others, 1989). Results are described.

Peverly, J.; Sanford, W.E.; Steenhuis, T.S. [Cornell Univ., Ithaca, NY (United States)

1993-11-01T23:59:59.000Z

305

Burlington Bottoms Wildlife Mitigation Project. Final Environmental Assessment/Management Plan and Finding of No Significant Impact.  

DOE Green Energy (OSTI)

Bonneville Power Administration (BPA) proposes to fund wildlife management and enhancement activities for the Burlington bottoms wetlands mitigation site. Acquired by BPA in 1991, wildlife habitat at Burlington bottoms would contribute toward the goal of mitigation for wildlife losses and inundation of wildlife habitat due to the construction of Federal dams in the lower Columbia and Willamette River Basins. Target wildlife species identified for mitigation purposes are yellow warbler, great blue heron, black-capped chickadee, red-tailed hawk, valley quail, spotted sandpiper, wood duck, and beaver. The Draft Management Plan/Environmental Assessment (EA) describes alternatives for managing the Burlington Bottoms area, and evaluates the potential environmental impacts of the alternatives. Included in the Draft Management Plan/EA is an implementation schedule, and a monitoring and evaluation program, both of which are subject to further review pending determination of final ownership of the Burlington Bottoms property.

Not Available

1994-12-01T23:59:59.000Z

306

Thermodynamic geometry of charged rotating BTZ black holes  

SciTech Connect

We study the thermodynamics and the thermodynamic geometries of charged rotating Banados-Teitelboim-Zanelli black holes in (2+1)-gravity. We investigate the thermodynamics of these systems within the context of the Weinhold and Ruppeiner thermodynamic geometries and the recently developed formalism of geometrothermodynamics. Considering the behavior of the heat capacity and the Hawking temperature, we show that Weinhold and Ruppeiner geometries cannot describe completely the thermodynamics of these black holes and of their limiting case of vanishing electric charge. In contrast, the Legendre invariance imposed on the metric in geometrothermodynamics allows one to describe the charged rotating Banados-Teitelboim-Zanelli black holes and their limiting cases in a consistent and invariant manner.

Akbar, M. [Center for Advanced Mathematics and Physics, National University of Sciences and Technology, H-12, Islamabad (Pakistan); Quevedo, H. [Instituto de Ciencias Nucleares, Universidad Nacional Autonoma de Mexico, AP 70543, Mexico, DF 04510 (Mexico); ICRANet, Dipartimento di Fisica, Universita di Roma La Sapienza, I-00185 Roma (Italy); Saifullah, K. [Department of Mathematics, Quaid-i-Azam University, Islamabad (Pakistan); Sanchez, A. [Departamento de Posgrado, CIIDET, AP 752, Queretaro, QRO 76000 (Mexico); Taj, S. [Center for Advanced Mathematics and Physics, National University of Sciences and Technology, H-12, Islamabad (Pakistan); ICRANet, Dipartimento di Fisica, Universita di Roma La Sapienza, I-00185 Roma (Italy)

2011-04-15T23:59:59.000Z

307

How fast can a black hole release its information?  

E-Print Network (OSTI)

When a shell collapses through its horizon, semiclassical physics suggests that information cannot escape from this horizon. One might hope that nonperturbative quantum gravity effects will change this situation and avoid the `information paradox'. We note that string theory has provided a set of states over which the wavefunction of the shell can spread, and that the number of these states is large enough that such a spreading would significantly modify the classically expected evolution. In this article we perform a simple estimate of the spreading time, showing that it is much shorter than the Hawking evaporation time for the hole. Thus information can emerge from the hole through the relaxation of the shell state into a linear combination of fuzzballs.

Samir D. Mathur

2009-05-27T23:59:59.000Z

308

Nonviolent information transfer from black holes: a field theory parameterization  

E-Print Network (OSTI)

A candidate parameterization is introduced, in an effective field theory framework, for the quantum information transfer from a black hole that is necessary to restore unitarity. This in particular allows description of the effects of such information transfer in the black hole atmosphere, for example seen by infalling observers. In the presence of such information transfer, it is shown that infalling observers need not experience untoward violence. Moreover, the presence of general moderate-frequency couplings to field modes with high angular momenta offers a mechanism to enhance information transfer rates, commensurate with the increased energy flux, when a string is introduced to "mine" a black hole. Generic such models for nonviolent information transfer predict extra energy flux from a black hole, beyond that of Hawking.

Giddings, Steven B

2013-01-01T23:59:59.000Z

309

The structure of cosmic time  

E-Print Network (OSTI)

Following the approach of Julien Lesgourgues [1], we analyze the mathematical structure of the time co-ordinate of present day cosmological models, where these models include a cosmological constant term to account for the observed acceleration of the universe [2], [3]: we find that in all cases, except for a set of measure zero in the parameter space, the time is given by an (abelian) integral on a torus; the imaginary period of this integral then gives a natural periodicity in imaginary time for the universe; following Stephen Hawking [4], [5], this periodicity may be interpreted either as giving a fundamental mass scale for the universe, or (using Plancks constant) a fundamental temperature, or both. The precise structure that emerges suggests that the structure of time can be regarded as an order parameter arising perhaps in a phase transition in the early universe; one might hope that this structure

George Sparling

2006-01-01T23:59:59.000Z

310

Numerical simulations of turbulent flow fields caused by spraying of water on large releases of hydrogen fluoride  

Science Conference Proceedings (OSTI)

The effectiveness of water sprays in absorbing HF releases was recently demonstrated in extended laboratory and field tests. In this paper, computer simulations are presented of the Hawk, Nevada Test Site, series of field tests. The model used, HFSPRAY, is a Eulerean/Lagrangian model which simulates the momentum, mass and energy interactions between a water spray and a turbulent plume of HF in air; the model can predict the flow velocities, temperature, water vapor, and HF concentration fields in two-dimensional large- geometries for spraying in any direction, (i.e., down-flow, inclined-down-flow, up-flow, and co-current horizontal flow). The model was validated against recent data on spraying of water on large releases of HF. 17 refs., 11 figs., 4 tabs.

Fthenakis, V.M. (Brookhaven National Lab., Upton, NY (United States)); Schatz, K.W. (Mobil Research and Development Corp., Princeton, NJ (United States))

1991-05-01T23:59:59.000Z

311

How to Determine the Probability of the Higgs Boson Detection  

E-Print Network (OSTI)

The Higgs boson is the most important, though yet undiscovered ingredient of the standard model of particle physics. Its detection is therefore one of the most important goals of high energy physics that can guide future research in theoretical physics. Enormous efforts have been undertaken to prove the existence of the Higgs boson, and the physics community is excitedly awaiting the restart of the Large Hadron Collider at CERN. But how sure can we be that the Higgs exits at all? The German philosopher Immanuel Kant recommended betting at such controversial questions, and Stephen Hawking announced a $100 bet against the Higgs. But seriously, online prediction markets, which are a generalized form of betting, do provide the best possible probability estimates for future events. It is proposed that the scientific community uses this platforms for evaluation. See also an online description www.Bet-On-The-Higgs.com.

Alexander Unzicker

2009-12-02T23:59:59.000Z

312

Electric Energy Conservation and Production project: (Volume 2)  

Science Conference Proceedings (OSTI)

A final report has been prepared under the Electric Energy Conservation and Production Project, conducted by the Blackfeet Indian Tribe and its consultants, Black Hawk Associates, Inc. The report addresses two major issues - the heavy reliance on electricity by residents of the Blackfeet Reservation, and the opportunities for electricity production from wind energy resources on the Reservation. The findings of this report help provide a basis for comprehensive energy management planning on the Reservation, analyze the potential for minimizing electricity demand and maximizing the efficiency of electrical end-uses through appropriate conservation measures, assess the potential of wind energy resources located on the Reservation, and identify and assess the technical, financial, legal, institutional, and regulatory issues involved in wind energy development within the Blackfeet Reservation.

Not Available

1984-02-01T23:59:59.000Z

313

Electric Energy Conservation and Production Project: Vpolume 3: Wind energy potential  

Science Conference Proceedings (OSTI)

A final report has been prepared under the Electric Energy Conservation and Production Project, conducted by the Blackfeet Indian Tribe and its consultants, Black Hawk Associates, Inc. The report addresses two major issues - the heavy reliance on electricity by residents of the Blackfeet Reservation, and the opportunities for electricity production from wind energy resources on the Reservation. The findings of this report (1) help provide a basis for comprehensive energy management planning on the Reservation, (2) analyze the potential for minimizing electricity demand and maximizing the efficiency of electrical end-uses through appropriate conservation measures, (3) assess the potential of wind energy resources located on the Reservation, and (4) identify and assess the technical, financial, legal, institutional, and regulatory issues involved in wind energy development within the Blackfeet Reservation.

Not Available

1984-02-01T23:59:59.000Z

314

Transient evolution of a photon gas in the nonlinear QED vacuum  

SciTech Connect

Thermally induced vacuum polarization stemming from QED radiative corrections to the electromagnetic field equations is studied. The physical behavior of thermal radiation, in the nonlinear QED vacuum first described by Heisenberg and Euler, is a problem of some theoretical importance in view of its relation to the cosmic microwave background (CMB), early universe evolution, and Hawking-Unruh radiation. The questions of evolution toward equilibrium, stability, and invariance of thermal radiation under such conditions are of great interest. Our analysis presents novel aspects associated with photon-photon scattering in a photon gas in the framework of quantum kinetic theory. Within the context of the Euler-Heisenberg theory, we show that a homogeneous, isotropic photon gas with arbitrary spectral distribution function evolves toward an equilibrium state with a Bose-Einstein distribution. The transient evolution toward equilibrium of a gas of photons undergoing photon-photon scattering is studied in detail via the Boltzmann transport equation.

Wu, S Q; Hartemann, F V

2011-10-04T23:59:59.000Z

315

Superconductivity, Superfluidity and Holography  

E-Print Network (OSTI)

This is a concise review of holographic superconductors and superfluids. We highlight some predictions of the holographic models and the emphasis is given to physical aspects rather than to the technical details, although some references to understand the latter are systematically provided. We include gapped systems in the discussion, motivated by the physics of high-temperature superconductivity. In order to do so we consider a compactified extra dimension (with radius R), or, alternatively, a dilatonic field. The first setup can also be used to model cylindrical superconductors; when these are probed by an axial magnetic field a universal property of holography emerges: while for large R (compared to the other scales in the problem) non-local operators are suppressed, leading to the so called Little-Parks periodicity, the opposite limit shows non-local effects, e.g. the uplifting of the Little-Parks periodicity. This difference corresponds in the gravity side to a Hawking-Page phase transition.

Alberto Salvio

2013-01-02T23:59:59.000Z

316

Semiannual progress report for the Idaho Geothermal Program, October 1, 1978-March 31, 1979  

DOE Green Energy (OSTI)

Well drilling at the Geothermal Site is discussed. Experiments of the direct use of geothermal waters are described. An account of the facility's first 5-megawatt power plant is presented. The second 5-megawatt pilot plant's use of direct-contact heat exchangers is examined. University of Utah work on direct-contact heat exchangers is also discussed. The environmental studies of injection tests, an aquatic characterization survey of the Raft River and the ferruginous hawk are summarized. The regional planning effort for accelerated commercialization is described. Demonstration projects in Oregon, Utah, and South Dakota are noted. A biblographic index lists each internal and external report the Idaho Geothermal Program has published this report period.

Burdge, L.F.; Schultz, R.J.; Stiger, R.R.

1979-10-01T23:59:59.000Z

317

Manual of BlackMax, a black-hole event generator with rotation, recoil, split branes, and brane tension  

E-Print Network (OSTI)

This is the users manual of the black-hole event generator BlackMax, which simulates the experimental signatures of microscopic and Planckian black-hole production and evolution at proton-proton, proton-antiproton and electron-positron colliders in the context of brane world models with low-scale quantum gravity. The generator is based on phenomenologically realistic models free of serious problems that plague low-scale gravity. It includes all of the black-hole gray-body factors known to date and incorporates the effects of black-hole rotation, splitting between the fermions, non-zero brane tension and black-hole recoil due to Hawking radiation (although not all simultaneously).

De-Chang Dai; Cigdem Issever; Eram Rizvi; Glenn Starkman; Dejan Stojkovic; Jeff Tseng

2009-02-20T23:59:59.000Z

318

Minisuperspace model of Machian Resolution of Problem of Time. I. Isotropic Case  

E-Print Network (OSTI)

A local resolution to the Problem of Time that is Machian and was previously demonstrated for various relational mechanics models is here shown to work for a more widely studied quantum cosmological model. Namely, closed isotropic minisuperspace GR with minimally-coupled scalar field matter. This uses work firstly along the lines of Barbour's at the classical level. Secondly, it uses a Machianized version of the Semiclassical Approach to Quantum Cosmology. Finally, it uses a combined Machianized version of a combined Semiclassical Histories Timeless Records scheme along the lines of Halliwell's work. This program's goal is the treatment of Halliwell--Hawking type inhomogeneous perturbations about the present paper's model, drawing also qualitatively from the relational mechanics examples since these have nontrivial notions of inhomogeneity/structure (clumping) as well as nontrivial linear constraints.

Edward Anderson

2013-07-07T23:59:59.000Z

319

Kinematic study of the effect of dispersion in quantum vacuum emission from strong laser pulses  

E-Print Network (OSTI)

A strong light pulse propagating in a nonlinear medium causes an effective change in the local refractive index. With a suitable tuning of the pulse velocity, the leading and trailing edge of the pulse were predicted to behave as analogue black and white horizons in the limit of a dispersionless medium. In this paper, we study a more realistic situation where the frequency dispersion of the medium is fully taken into account. As soon as positive frequency modes with negative norm are present in the comoving frame, spontaneous emission of quantum vacuum radiation is expected to arise independently of the presence of horizons. We finally investigate the kinematic constraints put on the emission and we show that the optimal directions to observe Hawking-like emission form a narrow angle with the direction of propagation of the pulse.

Stefano Finazzi; Iacopo Carusotto

2012-04-16T23:59:59.000Z

320

Qunatum-Mechanical Model of Spacetime II: Thermodynamics of Spacetime  

E-Print Network (OSTI)

In this second part of our series of two papers, where spacetime is modelled by a graph, where Planck size quantum black holes lie on the vertices, we consider the thermodynamics of spacetime. We formulate an equation which tells in which way an accelerating, spacelike two-surface of spacetime interacts with the thermal radiation flowing through that surface. In the low temperature limit, where most quantum black holes constituting spacetime are assumed to lie in the ground state, our equation implies, among other things, the Hawking and the Unruh effects, as well as Einstein's field equation with a vanishing cosmological constant for general matter fields. We also consider the high temperature limit, where the microscopic black holes are assumed to lie in highly excited states. In this limit our model implies, among other things, that black hole entropy depends logarithmically on its area, instead of being proportional to the area.

Makela, J

2008-01-01T23:59:59.000Z

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321

A Simple Quantum-Mechanical Model of Spacetime II: Thermodynamics of Spacetime  

E-Print Network (OSTI)

In this second part of our series of two papers, where spacetime is modelled by a graph, where Planck size quantum black holes lie on the vertices, we consider the thermodynamics of spacetime. We formulate an equation which tells in which way an accelerating, spacelike two-surface of spacetime interacts with the thermal radiation flowing through that surface. In the low temperature limit, where most quantum black holes constituting spacetime are assumed to lie in the ground state, our equation implies, among other things, the Hawking and the Unruh effects, as well as Einstein's field equation with a vanishing cosmological constant for general matter fields. We also consider the high temperature limit, where the microscopic black holes are assumed to lie in highly excited states. In this limit our model implies, among other things, that black hole entropy depends logarithmically on its area, instead of being proportional to the area.

J. Makela

2008-05-26T23:59:59.000Z

322

Quantum-Mechanical Model of Spacetime  

E-Print Network (OSTI)

We consider a possibility to construct a quantum-mechanical model of spacetime, where Planck size quantum black holes act as the fundamental constituents of space and time. Spacetime is assumed to be a graph, where black holes lie on the vertices. Our model implies that area has a discrete spectrum with equal spacing. At macroscopic length scales our model reproduces Einstein's field equation with a vanishing cosmological constant as a sort of thermodynamical equation of state of spacetime and matter fields. In the low temperature limit, where most black holes are assumed to be in the ground state, our model implies the Unruh and the Hawking effects, whereas in the high temperature limit we find, among other things, that black hole entropy depends logarithmically on the event horizon area, instead of being proportional to the area.

Makela, J

2007-01-01T23:59:59.000Z

323

How to interpret black hole entropy?  

E-Print Network (OSTI)

We consider a possibility that the entropy of a Schwarzschild black hole has two different interpretations: The black hole entropy can be understood either as an outcome of a huge degeneracy in the mass eigenstates of the hole, or as a consequence of the fact that the interior region of black hole spacetime is separated from the exterior region by a horizon. In the latter case, no degeneracy in the mass eigenstates needs to be assumed. Our investigation is based on calculations performed with Lorentzian partition functions obtained for a whole maximally extended Schwarzschild spacetime, and for its right-hand-side exterior region. To check the correctness of our analysis we reproduce, in the leading order approximation, the Bekenstein--Hawking entropy of the Schwarzschild black hole.

J. Makela; P. Repo

1998-12-21T23:59:59.000Z

324

Quantum-Mechanical Model of Spacetime  

E-Print Network (OSTI)

We consider a possibility to construct a quantum-mechanical model of spacetime, where Planck size quantum black holes act as the fundamental constituents of space and time. Spacetime is assumed to be a graph, where black holes lie on the vertices. Our model implies that area has a discrete spectrum with equal spacing. At macroscopic length scales our model reproduces Einstein's field equation with a vanishing cosmological constant as a sort of thermodynamical equation of state of spacetime and matter fields. In the low temperature limit, where most black holes are assumed to be in the ground state, our model implies the Unruh and the Hawking effects, whereas in the high temperature limit we find, among other things, that black hole entropy depends logarithmically on the event horizon area, instead of being proportional to the area.

Jarmo Makela

2007-01-24T23:59:59.000Z

325

The Generalized Uncertainty Principle and Black Hole Remnants  

DOE Green Energy (OSTI)

In the current standard viewpoint small black holes are believed to emit black body radiation at the Hawking temperature, at least until they approach Planck size, after which their fate is open to conjecture. A cogent argument against the existence of remnants is that, since no evident quantum number prevents it, black holes should radiate completely away to photons and other ordinary stable particles and vacuum, like any unstable quantum system. Here we argue the contrary, that the generalized uncertainty principle may prevent their total evaporation in exactly the same way that the uncertainty principle prevents the hydrogen atom from total collapse: the collapse is prevented, not by symmetry, but by dynamics, as a minimum size and mass are approached.

Chen, Pisin

2001-06-01T23:59:59.000Z

326

On The Capacity of Surfaces in Manifolds with Nonnegative Scalar Curvature  

E-Print Network (OSTI)

Given a surface in an asymptotically flat 3-manifold with nonnegative scalar curvature, we derive an upper bound for the capacity of the surface in terms of the area of the surface and the Willmore functional of the surface. The capacity of a surface is defined to be the energy of the harmonic function which equals 0 on the surface and goes to 1 at infinity. Even in the special case of Euclidean space, this is a new estimate. More generally, equality holds precisely for a spherically symmetric sphere in a spatial Schwarzschild 3-manifold. As applications, we obtain inequalities relating the capacity of the surface to the Hawking mass of the surface and the total mass of the asymptotically flat manifold.

Hubert Bray; Pengzi Miao

2007-07-23T23:59:59.000Z

327

Graphene: QFT in curved spacetimes close to experiments  

E-Print Network (OSTI)

A recently proposed step-by-step procedure, to merge the low-energy physics of the $\\pi$-bonds electrons of graphene, and quantum field theory on curved spacetimes, is recalled. The last step there is the proposal of an experiment to test a Hawking-Unruh effect, emerging from the model, that manifests itself as an exact (within the model) prediction for the electronic local density of states, in the ideal case of the graphene membrane shaped as a Beltrami pseudosphere. A discussion about one particular attempt to experimentally test the model on molecular graphene is presented, and it is taken as an excuse to solve some basic issues that will help future experiments. In particular, it is stated that the effect should be visible on generic surfaces of constant negative Gaussian curvature, that are infinite in number.

Alfredo Iorio

2013-04-09T23:59:59.000Z

328

Gauss-bonnet black holes and possibilities for their experimental search  

SciTech Connect

Corollaries of gravity models with second-order curvature corrections in the form of a Gauss-Bonnet term and possibilities (or impossibilities) for their experimental search or observations are discussed. The full version of the four-dimensional Schwarzschild-Gauss-Bonnet black hole solution and the constraint on the possible minimal black hole mass following from this model are considered. Using our solution as a model for the final stages of Hawking evaporation of black holes with a low initial mass (up to 10{sup 15} g) whose lifetime is comparable to that of our Universe, we have revealed differences in the patterns of evaporation: we have obtained high values of the emitted energy and showed the impossibility of an experimental search for primordial black holes by their evaporation products. Scenarios for the evaporation of Gauss-Bonnet black holes in multidimensional gravity models and possibilities for their experimental search are also discussed.

Alexeyev, S. O., E-mail: alexeyev@sai.msu.ru; Rannu, K. A., E-mail: rannu@xray.sai.msu.ru [Sternberg Astronomical Institute (Russian Federation)

2012-03-15T23:59:59.000Z

329

Semiannual progress report for the Idaho Geothermal Program, October 1, 1978-March 31, 1979  

SciTech Connect

Well drilling at the Geothermal Site is discussed. Experiments of the direct use of geothermal waters are described. An account of the facility's first 5-megawatt power plant is presented. The second 5-megawatt pilot plant's use of direct-contact heat exchangers is examined. University of Utah work on direct-contact heat exchangers is also discussed. The environmental studies of injection tests, an aquatic characterization survey of the Raft River and the ferruginous hawk are summarized. The regional planning effort for accelerated commercialization is described. Demonstration projects in Oregon, Utah, and South Dakota are noted. A biblographic index lists each internal and external report the Idaho Geothermal Program has published this report period.

Burdge, L.F.; Schultz, R.J.; Stiger, R.R.

1979-10-01T23:59:59.000Z

330

On the Density of PBH's in the Galactic Halo  

E-Print Network (OSTI)

Calculations of the rate of local Primordial Black Hole explosions often assume that the PBH's can be highly concentrated into galaxies, thereby weakening the Page-Hawking limit on the cosmological density of PBH's. But if the PBH's are concentrated by a factor exceeding $c/(H_\\circ R_\\circ) \\approx 4 \\times 10^5$, where $R_\\circ = 8.5$ kpc is the scale of the Milky Way, then the steady emission from the PBH's in the halo will produce an anisotropic high latitude diffuse gamma ray intensity larger than the observed anisotropy. This provides a limit on the rate-density of evaporating PBH's of $\\lesssim 0.4$~pc$^{-3}$yr$^{-1}$ which is more than 6 orders of magnitude lower than recent experimental limits. However, the weak observed anisotropic high latitude diffuse gamma ray intensity is consistent with the idea that the dark matter that closes the Universe is Planck mass remnants of evaporated black holes.

Edward L. Wright

1995-09-14T23:59:59.000Z

331

Bakry-mery black holes  

E-Print Network (OSTI)

Scalar-tensor gravitation theories, such as the Brans-Dicke family of theories, are commonly partly described by a modified Einstein equation in which the Ricci tensor is replaced by the Bakry-\\'Emery-Ricci tensor of a Lorentzian metric and scalar field. In physics this formulation is sometimes referred to as the "Jordan frame". Just as, in General Relativity, natural energy conditions on the stress-energy tensor become conditions on the Ricci tensor, in scalar-tensor theories expressed in the Jordan frame natural energy conditions become conditions on the Bakry-\\'Emery-Ricci tensor. We show that, if the Bakry-\\'Emery tensor obeys the null energy condition with an upper bound on the Bakry-\\'Emery scalar function, there is a modified notion of apparent horizon which obeys analogues of familiar theorems from General Relativity. The Bakry-\\'Emery modified apparent horizon always lies behind an event horizon and the event horizon obeys a modified area theorem. Under more restrictive conditions, the modified apparent horizon obeys an analogue of the Hawking topology theorem in 4 spacetime dimensions. Since topological censorship is known to yield a horizon topology theorem independent of the Hawking theorem, in an appendix we obtain a Bakry-\\'Emery version of the topological censorship theorem. We apply our results to the Brans-Dicke theory, and obtain an area theorem for horizons in that theory. Our theorems can be used to understand behaviour observed in numerical simulations by Scheel, Shapiro, and Teukolsky of dust collapse in Brans-Dicke theory.

M Rupert; E Woolgar

2013-10-15T23:59:59.000Z

332

Black Hole Evaporation as a Nonequilibrium Process  

E-Print Network (OSTI)

When a black hole evaporates, there arises a net energy flow from the black hole into its outside environment due to the Hawking radiation and the energy accretion onto black hole. Exactly speaking, due to the net energy flow, the black hole evaporation is a nonequilibrium process. To study details of evaporation process, nonequilibrium effects of the net energy flow should be taken into account. In this article we simplify the situation so that the Hawking radiation consists of non-self-interacting massless matter fields and also the energy accretion onto the black hole consists of the same fields. Then we find that the nonequilibrium nature of black hole evaporation is described by a nonequilibrium state of that field, and we formulate nonequilibrium thermodynamics of non-self-interacting massless fields. By applying it to black hole evaporation, followings are shown: (1) Nonequilibrium effects of the energy flow tends to accelerate the black hole evaporation, and, consequently, a specific nonequilibrium phenomenon of semi-classical black hole evaporation is suggested. Furthermore a suggestion about the end state of quantum size black hole evaporation is proposed in the context of information loss paradox. (2) Negative heat capacity of black hole is the physical essence of the generalized second law of black hole thermodynamics, and self-entropy production inside the matter around black hole is not necessary to ensure the generalized second law. Furthermore a lower bound for total entropy at the end of black hole evaporation is given. A relation of the lower bound with the so-called covariant entropy bound conjecture is interesting but left as an open issue.

Hiromi Saida

2008-11-11T23:59:59.000Z

333

Microscopic quantum structure of black hole and vacuum versus quantum statistical origin of gravity  

E-Print Network (OSTI)

The Planckon densely piled model of vacuum is proposed. Based on it, the microscopic quantum structure of Schwarzschild black hole and quantum statistical origin of its gravity are studied. It is shown that thermodynamic temperature equilibrium and mechanical acceleration balance make the space-time of the black hole horizon singular and Casimir effect works inside the horizon. This effect makes the inside vacuum have less zero fluctuation energy than the outside vacuum, and a temperature difference as well as gravity as thermal pressure are created. A dual relation between inside and outside regions of the black hole is found. By the dual relation, an attractor behaviour of the horizon surface is unveiled. Outside horizon, there exist thermodynamic non-equilibrium and mechanical non-balance which lead to outward centrifugal energy flow and inward gravitation energy flow, their compensation establishes local equilibrium. The lost vacuum energy in negative gravitation potential regions has been removed to the black hole surface to form a spherical Planckon shell with the thickness of Planckon diameter. All the particles absorbed by the black hole have fallen down to the horizon and converted into spin 1/2 radiation quanta made of standing waves on the horizon sphere with the mean energy related to Hawking-Unruh temperature, thermodynamic equilibrium and mechanical balance keep them stable and be tightly bound in the horizon. The gravitation mass 2M and physical mass $M$ of the black hole are calculated. The entropy of the black hole, calculated from the microscopic state number of the many-body system of radiation fermion quanta, is well consistent with Hawking. A radical modification of the temperature law of the black hole is made. The accelerating expansion of the universe yields the expansion cosmon and its energy density agrees with dark energy density.

Shun-Jin Wang

2012-12-24T23:59:59.000Z

334

Detection of explosive events by monitoring acoustically-induced geomagnetic perturbations  

Science Conference Proceedings (OSTI)

The Black Thunder Coal Mine (BTCM) near Gillette, Wyoming was used as a test bed to determine the feasibility of detecting explosion-induced geomagnetic disturbances with ground-based induction magnetometers. Two magnetic observatories were fielded at distances of 50 km and 64 km geomagnetically north from the northernmost edge of BTCM. Each observatory consisted of three separate but mutually orthogonal magnetometers, Global Positioning System (GPS) timing, battery and solar power, a data acquisition and storage system, and a three-axis seismometer. Explosions with yields of 1 to 3 kT of TNT equivalent occur approximately every three weeks at BTCM. We hypothesize that explosion-induced acoustic waves propagate upward and interact collisionally with the ionosphere to produce ionospheric electron density (and concomitant current density) perturbations which act as sources for geomagnetic disturbances. These disturbances propagate through an ionospheric Alfven waveguide that we postulate to be leaky (due to the imperfectly conducting lower ionospheric boundary). Consequently, wave energy may be observed on the ground. We observed transient pulses, known as Q-bursts, with pulse widths about 0.5 s and with spectral energy dominated by the Schumann resonances. These resonances appear to be excited in the earth-ionosphere cavity by Alfven solitons that may have been generated by the explosion-induced acoustic waves reaching the ionospheric E and F regions and that subsequently propagate down through the ionosphere to the atmosphere. In addition, we observe late time (> 800 s) ultra low frequency (ULF) geomagnetic perturbations that appear to originate in the upper F region ({approximately}300 km) and appear to be caused by the explosion-induced acoustic wave interacting with that part of the ionosphere. We suggest that explosion-induced Q-bursts may be discriminated from naturally occurring Q-bursts by association of the former with the late time explosion-induced ULF perturbations. We also present evidence for an acoustically-induced magnetic signal at both magnetic observatories, indicating that magnetometers act as highly sensitive detectors of acoustically-induced ground motion. Further experimental and theoretical work are required to improve confidence in these conclusions.

Lewis, J P; Rock, D R; Shaeffer, D L; Warshaw, S I

1999-10-07T23:59:59.000Z

335

Two-Color Self-Seeding at LCLS | Stanford Synchrotron Radiation Lightsource  

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

Two-Color Self-Seeding at LCLS Two-Color Self-Seeding at LCLS Wednesday, September 18, 2013 - 3:00pm SLAC, Redtail Hawk Conference Room 108A Franz-Josef Decker, Accelerator Directorate The Linac Coherent Light Source (LCLS) produces typically SASE FEL pulses with intensities of up to 5 mJ and at high photon energy an FEL bandwidth 0.2% (FWHM). Self-seeding with a diamond crystal reduces the bandwidth by a factor of 10 to 40. The range depends on which Bragg reflection is used, or the special setup of the electron beam like over-compression. The peak intensity level is lower by a factor of only five, giving the seeded beam an advantage of about 2.5 in average intensity over the use of a monochromator with SASE. At certain energies and crystal angles different Bragg lines cross which allows seeding at two or even three different colors inside the bandwidth

336

Owls  

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

Owls Owls Nature Bulletin No. 267-A April 29, 1967 Forest Preserve District of Cook County Richard B. Ogilvie, President Roland F. Eisenbeis, Supt. of Conservation OWLS The owls, of all our native birds, are least understood. Most kinds remain hidden, motionless and silent during the day and hunt only at night or in the dim twilight of morning and evening. Only a few, like our common Short-eared Owl and those big owls of the far north -- the Snowy Owl, the Great Gray Owl and the Hawk Owl -- habitually hunt in daytime. Because an owl' s feathers are peculiarly soft and fluffy, it flies as silently as a passing shadow, swoops upon its prey unheard, and its Indian name was "hush-wing". Since ancient times there have been many superstitions and legends about these birds. They have been regarded as the companions of sorcerers, witches, ghosts, hobgoblins and Satan himself. Their weird nocturnal hootings, gobblings and screams were and are believed to predict death, illness or disaster. Even today, in our southern states, the plaintive quavering cry of the Little Screech Owl -- which they call the "Shivering" Owl -- will cause some people to get out of bed and turn over their left shoe; others to throw a nail or other iron object into the fire. To the Greeks and Romans, the owl was a symbol of wisdom and was the companion of their goddess of wisdom.

337

Semiannual progress report for the Idaho Geothermal Program, April 1--September 30, 1978  

SciTech Connect

Research and development performed by the Idaho Geothermal Program between April 1 and September 30, 1978 are discussed. Well drilling and facility construction at the Raft River geothermal site are described. Efforts to understand the geothermal reservoir are explained, and attempts to predict the wells' potential are summarized. Investigations into the direct uses of geothermal water, such as for industrial drying, fish farming, and crop irrigation, are reported. The operation of the facility's first electrical generator is described. Construction of the first 5-megawatt power plant is recounted. The design effort for the second pilot power plant is also described. University of Utah work with direct-contact heat exchangers is outlined. Special environmental studies of injection tests, ferruginous hawks, and dental fluorisis are summarized. The regional planning effort for accelerated commercialization is described. Demonstration projects in Oregon, Utah, and South Dakota are noted. A bibliographical appendix lists each internal and external report the Idaho Geothermal Program has published since its beginning in 1973.

Blake, G.L. (ed.)

1978-11-01T23:59:59.000Z

338

The Toad  

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

Toad Toad Nature Bulletin No. 158 June 5, 1948 Forest Preserve District of Cook County William N. Erickson, President Roberts Mann, Supt. of Conservation THE TOAD The toad, distinguished by its wide heavy body, dry warty skin and a large kidney-shaped gland on each shoulder, is a most interesting and valuable animal. There are many superstitions about this gentle harmless amphibian so loathed by many people. It is not evil or venomous; it does not "rain down" from the sky; it cannot exist for centuries sealed in the heart of a tree or solid rock; it does not cause warts. From those two big glands and from the "warts", which are also glands, a toad can secrete a milky fluid which is harmless to man but which makes it distasteful to most animals. However, they are eaten by most large snakes and by many hawks, owls, herons and bitterns. Because its food is chiefly insects and their larvae, of which it consumes great quantities, the toad is a valuable friend to the farmer and gardener even though it also eats spiders and earthworms.

339

The Screech Owl  

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

Screech Owl Screech Owl Nature Bulletin No. 100 January 25, 1947 Forest Preserve District of Cook County William N. Erickson, President Roberts Mann, Superintendent of Conservation THE SCREECH OWL At the foot of a dead oak where we hoped to find some winter mushrooms beneath the grass and fallen leaves, we spied several pellets about the size and shape of the end of your thumb. They were clean and odorless, each containing the skull and bones of a mouse tightly wrapped in a layer of the animal's fur. Owls and hawks swallow their prey whole or in large pieces and later spit out the indigestible matter in the form of pellets. Up in this tree was a woodpecker hole from which the round unwinking yellow eyes of a screech owl glared at us. A screech owl, about the size of a robin but much chunkier, is our only small owl with ear tufts like "horns". They prey on mice, chipmunks and ground squirrels, fish, crayfish, amphibians, small snakes, angleworms, and large insects. When other food is scarce, and their fuzzy white young -- usually four in number -- require much food, they frequently kill birds but apparently not enough to seriously affect the bird population. No owl, of any species, should be killed.

340

Eyeball Growth  

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

Eyeball Growth Eyeball Growth Name: Jade Hawk Status: N/A Age: N/A Location: N/A Country: N/A Date: N/A Question: Okay, I know I'm supposed to be able to answer questions here, but a friend who teaches grades 7 & 8 general science wants to know if the human eyeball is fully grown at birth. I checked my references, which are rather limited when it comes to human physiology, and found nothing. Can anyone help? Replies: The eye will still develop in size, pigmentation, and neurologically but I don't have the details here at hand. A kitten is born with eyes even more immature than human babies. Besides having sealed eyes that take about a week to open, they have retinas that a avascularized and need to undergo neovascularization to properly nourish and oxygenate the tissue. We have used the kitten to study retinopathy of prematurity, a condition caused in part by increased inspired oxygen. The kitten is also used in the study of diabetic retinopathy which a I think is the leading cause of blindness in the US. Look up publications by Dale Phelps, MD.

Note: This page contains sample records for the topic "thunder hawk mc734" from the National Library of EnergyBeta (NLEBeta).
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We encourage you to perform a real-time search of NLEBeta
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341

Bulk emission by higher-dimensional black holes: almost perfect blackbody radiation  

E-Print Network (OSTI)

We study the Hawking radiation emitted into the bulk by $(D+1)$-dimensional Schwarzschild black holes. It is well-known that the black-hole spectrum departs from exact blackbody form due to the frequency dependence of the `greybody' factors. For intermediate values of $D$ ($3\\leq D\\lesssim10$), these frequency-dependent factors may significantly modify the spectrum of the emitted radiation. However, we point out that for $D\\gg1$, the typical wavelengths in the black-hole spectrum are much {\\it shorter} than the size of the black hole. In this regime, the greybody factors are well described by the geometric-optics approximation according to which they are almost frequency-independent. Following this observation, we argue that for higher-dimensional black holes with $D\\gg1$, the total power emitted into the bulk should be well approximated by the analytical formula for perfect blackbody radiation. We test the validity of this analytical prediction with numerical computations.

Shahar Hod

2011-07-05T23:59:59.000Z

342

Bulk emission by higher-dimensional black holes: almost perfect blackbody radiation  

E-Print Network (OSTI)

We study the Hawking radiation emitted into the bulk by $(D+1)$-dimensional Schwarzschild black holes. It is well-known that the black-hole spectrum departs from exact blackbody form due to the frequency dependence of the `greybody' factors. For intermediate values of $D$ ($3\\leq D\\lesssim10$), these frequency-dependent factors may significantly modify the spectrum of the emitted radiation. However, we point out that for $D\\gg1$, the typical wavelengths in the black-hole spectrum are much {\\it shorter} than the size of the black hole. In this regime, the greybody factors are well described by the geometric-optics approximation according to which they are almost frequency-independent. Following this observation, we argue that for higher-dimensional black holes with $D\\gg1$, the total power emitted into the bulk should be well approximated by the analytical formula for perfect blackbody radiation. We test the validity of this analytical prediction with numerical computations.

Hod, Shahar

2011-01-01T23:59:59.000Z

343

FRW Quantum Cosmology with a Generalized Chaplygin Gas  

E-Print Network (OSTI)

Cosmologies with a Chaplygin gas have recently been explored with the objective of explaining the transition from a dust dominated epoch towards an accelerating expansion stage. We consider the hypothesis that the transition to the accelerated period involves a quantum mechanical process. Three physically admissible cases are possible. In particular, we identify a minisuperspace configuration with two Lorentzian sectors, separated by a classically forbidden region. The Hartle-Hawking and Vilenkin wave functions are computed, together with the transition amplitudes towards the accelerating epoch. Furthermore, it is found that for specific initial conditions, the parameters characterizing the generalized Chaplygin gas become related through an expression involving an integer $n$. We also introduce a phenomenological association between some brane-world scenarios and a FRW minisuperspace cosmology with a generalized Chaplygin gas. The aim is to promote a discussion and subsequent research on the quantum creation of brane cosmologies from such a perspective. Results suggest that the brane tension would become related with generalized Chaplygin gas parameters through another expression involving an integer.

Mariam Bouhmadi-Lopez; Paulo Vargas Moniz

2004-04-27T23:59:59.000Z

344

Quantized Gravitational Radiation from Black Holes and other Macro Holeums in the Low Frequency Domain  

E-Print Network (OSTI)

A gravitational bound state, called a Macro Holeum, is created from a very large number of microscopic black holes of primordial or a non-primordial origin. All of them undergo orbital motion, under the action of gravity, around their common center of mass. Four classes of Macro Holeum emerge: H, BH, HH and LH. The latter is a massless bundle of gravitational energy moving at the speed of light. The others are Dark Matter objects. BH emits Hawking radiation but the others do not. The presently existing black holes are identified with BH. All, except LH, emit gravitational radiation due to internal quantum transitions. Simple analytic formulae are derived for the energy eigenvalues, mass, radius, density and the frequency of the gravitational radiation emitted by Macro Holeums in terms of just two parameters which can be determined from the gravitational spectra. We predict that black holes have internal structure and that they and other Macro Holeums, having masses in the range 57 solar masses to 870 solar masses, would emit hydrogen-like gravitational radiation in the LIGO frequency range in the form of band or line spectra with a considerable overlapping of the bands. This will be superposed on a uniform background radiation coming from Macro Holeums at large distances greater than 100 Mpc. 04.60.-m, 04.60.Bc, 04.30.-w, 04.30.Tv, 95.35.+d, 95.36.+x

A. L. Chavda; L. K. Chavda

2009-03-04T23:59:59.000Z

345

Report on the remedial investigation of Bear Creek Valley at the Oak Ridge Y-12 Plant, Oak Ridge, Tennessee. Volume 6: Appendix G -- Baseline ecological risk assessment report  

Science Conference Proceedings (OSTI)

This Remedial Investigation (RI) Report characterizes the nature and extent of contamination, evaluates the fate and transport of contaminants, and assesses risk to human health and the environment resulting from waste disposal and other US Department of Energy (DOE) operations in Bear Creek Valley (BCV). BCV, which is located within the DOE Oak Ridge Reservation (ORR) encompasses multiple waste units containing hazardous and radioactive wastes arising from operations at the adjacent Oak Ridge Y-12 Plant. The primary waste units discussed in this RI Report are the S-3 Site, Oil Landfarm (OLF), Boneyard/Burnyard (BYBY), Sanitary Landfill 1 (SL 1), and Bear Creek Burial Grounds (BCBG). These waste units, plus the contaminated media resulting from environmental transport of the wastes from these units, are the subject of this RI. This BCV RI Report represents the first major step in the decision-making process for the BCV watershed. The RI results, in concert with the follow-on FS will form the basis for the Proposed Plan and Record of Decision for all BCV sites. This comprehensive decision document process will meet the objectives of the watershed approach for BCV. Appendix G contains ecological risks for fish, benthic invertebrates, soil invertebrates, plants, small mammals, deer, and predator/scavengers (hawks and fox). This risk assessment identified significant ecological risks from chemicals in water, sediment, soil, and shallow ground water. Metals and PCBs are the primary contaminants of concern.

NONE

1996-09-01T23:59:59.000Z

346

Busan, Republic of Korea Yellowfin Tuna Fisheries in New Zealand and the Southwest Pacific Ocean  

E-Print Network (OSTI)

clubs and commercial fishers to describe trends in the availability and abundance of Yellowfin Tuna in New Zealand. 2. To look for catch trends in the rest of the Western Pacific that may be similar or different to those in New Zealand. 3. To summarise Western and Central Pacific Fisheries Commission views on the status of the Yellowfin stock and current management measures. 4. To discuss the trends observed and what management action may be required in the future. Description of the sport fishery Yellowfin tuna has been an important target and bycatch species for New Zealand recreational fishers for 30 years. It has been a major component of the sport fishery in East Northland, Bay of Plenty and occasionally as far south as Hawke Bay on the North Island east coast and Kawhia on the west coast. Except in the eastern Bay of Plenty, the predominant fishing method is trolled lures. However, when the tuna are plentiful they surround meatballs of anchovy, pilchard and

Holdsworth J; John Holdsworth; Overall Objective

2012-01-01T23:59:59.000Z

347

Vacuum Instability in Electric Fields via AdS/CFT: Euler-Heisenberg Lagrangian and Planckian Thermalization  

E-Print Network (OSTI)

We analyze vacuum instability of strongly coupled gauge theories in a constant electric field using AdS/CFT correspondence. The model is the N=2 1-flavor supersymmetric large N_c QCD in the strong 't Hooft coupling limit. We calculate the Euler-Heisenberg effective Lagrangian L(E), which encodes the nonlinear response and the quantum decay rate of the vacuum in a background electric field E, from the complex D-brane action in AdS/CFT. We find that the decay rate given by Im L(E) becomes nonzero above a critical electric field set by the confining force between quarks. A large-E expansion of Im L(E) is found to coincide with that of the Schwinger effects in QED, replacing its electron mass by the confining force. Then, the time-dependent response of the system in a strong electric field is solved non-perturbatively, and we observe a universal thermalization at a shortest timescale "Planckian thermalization time" t ~ 1/T ~ E^{-1/2}. Here, T is an effective temperature which quarks feel in the nonequilibrium state with nonzero electric current, calculated in AdS/CFT as a Hawking temperature. Stronger electric fields accelerate the thermalization, and for a realistic value of the electric field in RHIC experiment, we obtain t ~ 1 [fm/c], which is consistent with the believed value.

Koji Hashimoto; Takashi Oka

2013-07-28T23:59:59.000Z

348

Evolution of the Ly-alpha luminosity function from z = 6.5 to z = 7.7: evidence for the epoch of reionization ?  

E-Print Network (OSTI)

Aims. Ly-alpha emitters (LAEs) can be detected out to very high redshifts, during the epoch of reionization. The evolution of the LAE luminosity function with redshift is a direct probe of the Ly-alpha transmission of the intergalactic medium (IGM), and therefore of the IGM neutral-hydrogen fraction. Measuring the Ly-alpha luminosity function (LF) of Ly-alpha emitters at redshift z = 7.7 therefore allows us to constrain the ionizing state of the Universe at this redshift. Methods. We observe three 7.5'x7.5' fields with the HAWK-I instrument at the VLT with a narrowband filter centered at 1.06 $\\mu$m, targeting Ly-alpha emitters at redshift z ~ 7.7. The fields are chosen for the availability of multi-wavelength data. One field is a galaxy cluster, the Bullet Cluster, allowing us to use gravitational amplification to probe luminosities fainter than in the field. The two other fields are sub-areas of the GOODS Chandra Deep Field South and CFHTLS-D4 deep field. We select z = 7.7 LAE candidates from a variety of c...

Clment, B; Courbin, F; Fontana, A; Freudling, W; Fynbo, J; Gallego, J; Hibon, P; Kneib, J -P; Fvre, O Le; Lidman, C; McMahon, R; Milvang-Jensen, B; Moller, P; Moorwood, A; Nilsson, K K; Pentericci, L; Venemans, B; Villar, V; Willis, J

2011-01-01T23:59:59.000Z

349

FRW quantum cosmology with a generalized Chaplygin gas  

SciTech Connect

Cosmologies with a Chaplygin gas have recently been explored with the objective of explaining the transition from a dust dominated epoch towards an accelerating expansion stage. In this context, we consider the hypothesis that this transition involves a quantum mechanical process. Our analysis is entirely analytical, with the objective of finding explicit mathematical expressions for the different quantum mechanical states and their cosmological implications. We employ a Friedmann-Robertson-Walker (FRW) minisuperspace model, characterized by two Lorentzian sectors, separated by a classically forbidden region. This is the configuration associated with the evolution of a generalized Chaplygin gas in a FRW universe. The Hartle-Hawking and Vilenkin wave functions are then computed, together with the transition amplitudes towards the accelerating epoch. Furthermore, for specific initial conditions we found that the generalized Chaplygin gas parameters become related through an expression involving an integer n. We also introduce a phenomenological association between some brane-world scenarios and a FRW minisuperspace cosmology with a generalized Chaplygin gas. The aim is to promote a discussion and subsequent research on the quantum creation of brane cosmologies from such a perspective. Additional results in this paper suggest that the brane tension would become related with the generalized Chaplygin gas parameters through another expression involving an integer.

Bouhmadi-Lopez, Mariam; Moniz, Paulo Vargas [Institute of Cosmology and Gravitation, University of Portsmouth, Mercantile House, Hampshire Terrace, Portsmouth PO1 2EG (United Kingdom); Astronomy Unit, School of Mathematical Sciences, Queen Mary, University of London, Mile End Road, London E1 4NS (United Kingdom)

2005-03-15T23:59:59.000Z

350

Unruh Effect under Non-equilibrium conditions: Oscillatory motion of an Unruh-DeWitt detector  

E-Print Network (OSTI)

The Unruh effect refers to the thermal fluctuations a detector experiences while undergoing linear motion with uniform acceleration in a Minkowski vacuum. This thermality can be demonstrated by tracing the vacuum state of the field over the modes beyond the accelerated detector's event horizon. However, the event horizon is well-defined only if the detector moves with eternal uniform linear acceleration. This idealized condition cannot be fulfilled in realistic situations when the motion unavoidably involves periods of non-uniform acceleration. Many experimental proposals to test the Unruh effect are of this nature. Often circular or oscillatory motion, which lacks an obvious geometric description, is considered in such proposals. The proper perspective for theoretically going beyond, or experimentally testing, the Unruh-Hawking effect in these more general conditions has to be offered by concepts and techniques in non-equilibrium quantum field theory. In this paper we provide a detailed analysis of how an Unruh-DeWitt detector undergoing oscillatory motion responds to the fluctuations of a quantum field. Numerical results for the late-time temperatures of the oscillating detector are presented. We comment on the digressions of these results from what one would obtain from a naive application of Unruh's result.

Jason Doukas; Shih-Yuin Lin; B. L. Hu; Robert B. Mann

2013-07-16T23:59:59.000Z

351

Avian risk behavior and fatalities at the Altamont Wind Resource Area: March 1998 - February 1999  

DOE Green Energy (OSTI)

Since 1981, more than 7,000 wind turbines have been installed in the Altamont Wind Resource Area in north-central California. Currently, about 5,000 turbines are operating. Past research efforts demonstrated that wind turbines frequently kill birds, especially raptors. Little is known about the specific flight and perching behaviors by birds near wind turbines. A better understanding of these interactions may one day yield insights on how to minimize bird fatalities. This Phase 1 progress report summarizes research findings obtained at 20 study plots totaling 785 turbines of various configurations and conducted between March 1998 and February 1999. The authors examined bird use and behaviors and collected data on fatalities at the same turbines throughout the course of the surveys. They completed 745 30-minute point counts (1,702 bird observations) that quantified bird risk behaviors and bird use of the study plots. The four most frequently observed bird species were red-tailed hawks, common ravens, turkey vultures, and golden eagles. During the same period, the authors recorded 95 bird fatalities. Raptors represent 51% (n=49) of the kills found. The data indicate that the relative abundance of species observed does not predict the relative frequency of fatalities per species. Phase II of the research is underway.

Thelander, C.; Rugge, L.

2000-05-08T23:59:59.000Z

352

Baseline avian use and behavior at the CARES wind plant site, Klickitat County, Washington  

SciTech Connect

This report presents a literature review on avian-wind turbine interactions and the results of a one-year avian baseline study conducted in 1998 at the proposed Conservation and Renewable Energy System (CARES) wind development site in Klickitat County, Washington. Avian use of the site ranged from 1.11/survey in the winter to 5.69/survey in the spring. Average use by passerines in the study plots ranged from 1.15 minutes/survey in the winter to 40.98 minutes/survey in the spring. Raptors spent much less time within plots than other groups, ranging from 0.05 minutes/survey in the winter to 0.77 minutes/survey during the fall. Thirteen percent of all flying birds were within the rotor-swept height (25 to 75 m); 41.6% of all raptors were flying at this height. Raptors with the greatest potential turbine exposure are red-tailed hawks and golden eagles. Passerines with the highest turbine exposure are common ravens, American robins, and horned larks. Spatial use data for the site indicate that avian use tends to be concentrated near the rim, indicating that placing turbines away from the rim may reduce risk. Avian use data at the CARES site indicate that if a wind plant is constructed in the future, avian mortality would likely be relatively low.

Erickson, W.P.; Johnson, G.D.; Strickland, M.D.; Kronner, K.; Becker, P.S.; Orloff, S.

2000-01-03T23:59:59.000Z

353

The fuzzball proposal for black holes  

E-Print Network (OSTI)

The fuzzball proposal states that associated with a black hole of entropy S there are exp S horizon-free non-singular solutions that asymptotically look like the black hole but generically differ from the black hole up to the horizon scale. These solutions, the fuzzballs, are considered to be the black hole microstates while the original black hole represents the average description of the system. The purpose of this report is to review current evidence for the fuzzball proposal, emphasizing the use of AdS/CFT methods in developing and testing the proposal. In particular, we discuss the status of the proposal for 2 and 3 charge black holes in the D1-D5 system, presenting new derivations and streamlining the discussion of their properties. Results to date support the fuzzball proposal but further progress is likely to require going beyond the supergravity approximation and sharpening the definition of a "stringy fuzzball". We outline how the fuzzball proposal could resolve longstanding issues in black hole physics, such as Hawking radiation and information loss. Our emphasis throughout is on connecting different developments and identifying open problems and directions for future research.

Kostas Skenderis; Marika Taylor

2008-04-03T23:59:59.000Z

354

New quantum gravity effect, dark energy, accelerating universe, black hole and experimental scheme using superfluid Helium and atom interferometer  

E-Print Network (OSTI)

Considerable attention has been focused on Verlinde's recent work, claiming that Newton's gravity is not a fundamental force. In a recent work (arXiv:1012.5858), we give further the logic basis and basic clues to derive the Newton's gravity, inertia law and Einstein's weak equivalence principle. In this work, we show that if the gravity is not a fundamental force, in special case, it could be repulsive when quantum wavepacket effect is considered. This quantum gravity effect leads to several physical effects: (1) It is consistent with the universe with accelerating expansion, if the gravity and quantum effect of the fluctuating 'vacuum' (dark energy) is considered. The role of the cosmological constant is naturally interpreted when the gravity and quantum effect of the whole 'vacuum' background is considered. (2) It leads to new idea about black hole information paradox, no-hair theorem and Hawking radiation. (3) With a sphere full of superfluid Helium, we propose a feasible experimental scheme to test our idea with an atom interferometer placed in the sphere. Our calculations show that the accuracy Delta g/g below 10^(-8) could be used to test our idea, which satisfies the present experimental technique of atom interferometer.

Hongwei Xiong

2011-01-03T23:59:59.000Z

355

Large photon productions in a gravitational collapsing  

E-Print Network (OSTI)

We study a possible gravitational vacuum-effect, in which vacuum-energy variation is due to variation of gravitational field, vacuum state gains gravitational energy and releases it by spontaneous photon emissions. Based on the path-integral representation, we present a general formulation of vacuum transition matrix and energy-momentum tensor of a quantum scalar field theory in curved spacetime. Using analytical continuation of dimensionality of the phase space, we calculate the difference of vacuum-energy densities in the presence and absence of gravitational field. Using the dynamical equation of gravitational collapse, we compute the rate of vacuum state gaining gravitational energy. Computing the transition amplitude from initial vacuum state to final vacuum state in gravitational collapsing process, we show the rate and spectrum of spontaneous photon emissions for releasing gravitational energy. The possible connection of our study to the genuine origin of gamma ray bursts is discussed. We compare our idea with the Schwinger idea for Sonoluminiescence and contrast our scenario with the Hawking effect.

She-Sheng Xue

2002-05-09T23:59:59.000Z

356

Reversible and irreversible spacetime thermodynamics for general Brans-Dicke theories  

Science Conference Proceedings (OSTI)

We derive the equations of motion for Palatini F(R) gravity by applying an entropy balance law TdS={delta}Q+{delta}N to the local Rindler wedge that can be constructed at each point of spacetime. Unlike previous results for metric F(R), there is no bulk viscosity term in the irreversible flux {delta}N. Both theories are equivalent to particular cases of Brans-Dicke scalar-tensor gravity. We show that the thermodynamical approach can be used ab initio also for this class of gravitational theories and it is able to provide both the metric and scalar equations of motion. In this case, the presence of an additional scalar degree of freedom and the requirement for it to be dynamical naturally imply a separate contribution from the scalar field to the heat flux {delta}Q. Therefore, the gravitational flux previously associated to a bulk viscosity term in metric F(R) turns out to be actually part of the reversible thermodynamics. Hence we conjecture that only the shear viscosity associated with Hartle-Hawking dissipation should be associated with irreversible thermodynamics.

Chirco, Goffredo; Eling, Christopher; Liberati, Stefano [SISSA, Via Bonomea 265, 34136 Trieste (Italy); INFN Sezione di Trieste, Via Valerio 2, 34127 Trieste (Italy)

2011-01-15T23:59:59.000Z

357

The Kerr/CFT Correspondence  

E-Print Network (OSTI)

Quantum gravity in the region very near the horizon of an extreme Kerr black hole (whose angular momentum and mass are related by J=GM^2) is considered. It is shown that consistent boundary conditions exist, for which the asymptotic symmetry generators form one copy of the Virasoro algebra with central charge c_L=12J / \\hbar. This implies that the near-horizon quantum states can be identified with those of (a chiral half of) a two-dimensional conformal field theory (CFT). Moreover, in the extreme limit, the Frolov-Thorne vacuum state reduces to a thermal density matrix with dimensionless temperature T_L=1/2\\pi and conjugate energy given by the zero mode generator, L_0, of the Virasoro algebra. Assuming unitarity, the Cardy formula then gives a microscopic entropy S_{micro}=2\\pi J / \\hbar for the CFT, which reproduces the macroscopic Bekenstein-Hawking entropy S_{macro}=Area / 4\\hbar G. The results apply to any consistent unitary quantum theory of gravity with a Kerr solution. We accordingly conjecture that extreme Kerr black holes are holographically dual to a chiral two-dimensional conformal field theory with central charge c_L=12J / \\hbar, and in particular that the near-extreme black hole GRS 1915+105 is approximately dual to a CFT with c_L \\sim 2 \\times 10^{79}.

Monica Guica; Thomas Hartman; Wei Song; Andrew Strominger

2008-09-25T23:59:59.000Z

358

CFT Duals for Extreme Black Holes  

E-Print Network (OSTI)

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

Hartman, Thomas; Nishioka, Tatsuma; Strominger, Andrew

2009-01-01T23:59:59.000Z

359

CFT Duals for Extreme Black Holes  

E-Print Network (OSTI)

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

Thomas Hartman; Keiju Murata; Tatsuma Nishioka; Andrew Strominger

2008-11-26T23:59:59.000Z

360

Warped Conformal Field Theory  

E-Print Network (OSTI)

We study field theories in two spacetime dimensions invariant under a chiral scaling symmetry that acts only on right-movers. The local symmetries include one copy of the Virasoro algebra and a U(1) current algebra. This differs from the 2d conformal group, but in some respects is equally powerful in constraining the theory. In particular, the symmetries on a torus lead to modular covariance of the partition function, which is used to derive a universal formula for the asymptotic density of states. For an application we turn to the holographic description of black holes in quantum gravity, motivated by the fact that the symmetries in the near horizon geometry of any extremal black hole are identical to those of a 2d field theory with chiral scaling. We consider two examples: black holes in warped AdS_3 in topologically massive gravity, and in string theory. In both cases, the density of states in the 2d field theory reproduces the Bekenstein-Hawking entropy of black holes in the gravity theory.

Detournay, Stephane; Hofman, Diego M

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "thunder hawk mc734" 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

Warped Conformal Field Theory  

E-Print Network (OSTI)

We study field theories in two spacetime dimensions invariant under a chiral scaling symmetry that acts only on right-movers. The local symmetries include one copy of the Virasoro algebra and a U(1) current algebra. This differs from the 2d conformal group, but in some respects is equally powerful in constraining the theory. In particular, the symmetries on a torus lead to modular covariance of the partition function, which is used to derive a universal formula for the asymptotic density of states. For an application we turn to the holographic description of black holes in quantum gravity, motivated by the fact that the symmetries in the near horizon geometry of any extremal black hole are identical to those of a 2d field theory with chiral scaling. We consider two examples: black holes in warped AdS_3 in topologically massive gravity, and in string theory. In both cases, the density of states in the 2d field theory reproduces the Bekenstein-Hawking entropy of black holes in the gravity theory.

Stephane Detournay; Thomas Hartman; Diego M. Hofman

2012-10-01T23:59:59.000Z

362

The Kerr/CFT Correspondence  

E-Print Network (OSTI)

Quantum gravity in the region very near the horizon of an extreme Kerr black hole (whose angular momentum and mass are related by J=GM^2) is considered. It is shown that consistent boundary conditions exist, for which the asymptotic symmetry generators form one copy of the Virasoro algebra with central charge c_L=12J / \\hbar. This implies that the near-horizon quantum states can be identified with those of (a chiral half of) a two-dimensional conformal field theory (CFT). Moreover, in the extreme limit, the Frolov-Thorne vacuum state reduces to a thermal density matrix with dimensionless temperature T_L=1/2\\pi and conjugate energy given by the zero mode generator, L_0, of the Virasoro algebra. Assuming unitarity, the Cardy formula then gives a microscopic entropy S_{micro}=2\\pi J / \\hbar for the CFT, which reproduces the macroscopic Bekenstein-Hawking entropy S_{macro}=Area / 4\\hbar G. The results apply to any consistent unitary quantum theory of gravity with a Kerr solution. We accordingly conjecture that ex...

Guica, Monica; Song, Wei; Strominger, Andrew

2008-01-01T23:59:59.000Z

363

Emissions characteristics of Military Helicopter Engines Fueled with JP-8 and a Fischer-Tropsch Fuel  

SciTech Connect

The rapid growth in aviation activities and more stringent U.S. Environmental Protection Agency regulations have increased concerns regarding aircraft emissions, due to their harmful health and environmental impacts, especially in the vicinity of airports and military bases. In this study, the gaseous and particulate-matter emissions of two General Electric T701C engines and one T700 engine were evaluated. The T700 series engines power the U.S. Army's Black Hawk and Apache helicopters. The engines were fueled with standard military JP-8 fuel and were tested at three power settings. In addition, one of the T701C engines was operated on a natural-gas-derived Fischer-Tropsch synthetic paraffinic kerosene jet fuel. Test results show that the T701C engine emits significantly lower particulate-matter emissions than the T700 for all conditions tested. Particulate-matter mass emission indices ranged from 0.2-1.4 g/kg fuel for the T700 and 0.2-0.6 g/kg fuel for the T701C. Slightly higher NOx and lower CO emissions were observed for the T701C compared with the T700. Operation of the T701C with the Fischer-Tropsch fuel rendered dramatic reductions in soot emissions relative to operation on JP-8, due primarily to the lack of aromatic compounds in the alternative fuel. The Fischer-Tropsch fuel also produced smaller particles and slight reductions in CO emissions.

Corporan, E. [Air Force Research Laboratory, Wright-Patterson AFB, OH; DeWitt, M. [Air Force Research Laboratory, Wright-Patterson AFB, OH; Klingshirn, Christopher D [ORNL; Striebich, Richard [Air Force Research Laboratory, Wright-Patterson AFB, OH; Cheng, Mengdawn [ORNL

2010-01-01T23:59:59.000Z

364

Electromagnetic mass-models in general relativity reexamined  

E-Print Network (OSTI)

The problem of constructing a model of an extended charged particle within the context of general relativity has a long and distinguished history. The distinctive feature of these models is that, in some way or another, they require the presence of negative mass in order to maintain stability against Coulomb's repulsion. Typically, the particle contains a core of $negative$ mass surrounded by a positive-mass outer layer, which emerges from the Reissner-Nordstr\\"{o}m field. In this work we show how the Einstein-Maxwell field equations can be used to construct an extended model where the mass is positive everywhere. This requires the principal pressures to be unequal inside the particle. The model is obtained by setting the "effective" matter density, rather than the rest matter density, equal to zero. The Schwarzschild mass of the particle arises from the electrical and gravitational field (Weyl tensor) energy. The model satisfies the energy conditions of Hawking and Ellis. A particular solution that illustrates the results is presented.

J. Ponce de Leon

2003-10-28T23:59:59.000Z

365

Semiannual progress report for the Idaho Geothermal Program, April 1--September 30, 1978  

DOE Green Energy (OSTI)

Research and development performed by the Idaho Geothermal Program between April 1 and September 30, 1978 are discussed. Well drilling and facility construction at the Raft River geothermal site are described. Efforts to understand the geothermal reservoir are explained, and attempts to predict the wells' potential are summarized. Investigations into the direct uses of geothermal water, such as for industrial drying, fish farming, and crop irrigation, are reported. The operation of the facility's first electrical generator is described. Construction of the first 5-megawatt power plant is recounted. The design effort for the second pilot power plant is also described. University of Utah work with direct-contact heat exchangers is outlined. Special environmental studies of injection tests, ferruginous hawks, and dental fluorisis are summarized. The regional planning effort for accelerated commercialization is described. Demonstration projects in Oregon, Utah, and South Dakota are noted. A bibliographical appendix lists each internal and external report the Idaho Geothermal Program has published since its beginning in 1973.

Blake, G.L. (ed.)

1978-11-01T23:59:59.000Z

366

Horizon effects with surface waves on moving water  

E-Print Network (OSTI)

Surface waves on a stationary flow of water are considered, in a linear model that includes the surface tension of the fluid. The resulting gravity-capillary waves experience a rich array of horizon effects when propagating against the flow. In some cases three horizons (points where the group velocity of the wave reverses) exist for waves with a single laboratory frequency. Some of these effects are familiar in fluid mechanics under the name of wave blocking, but other aspects, in particular waves with negative co-moving frequency and the Hawking effect, were overlooked until surface waves were investigated as examples of analogue gravity [Sch\\"utzhold R and Unruh W G 2002 Phys. Rev. D 66 044019]. A comprehensive presentation of the various horizon effects for gravity-capillary waves is given, with emphasis on the deep water/short wavelength case kh>>1 where many analytical results can be derived. A similarity of the state space of the waves to that of a thermodynamic system is pointed out.

Germain Rousseaux; Philippe Maissa; Christian Mathis; Pierre Coullet; Thomas G. Philbin; Ulf Leonhardt

2010-04-30T23:59:59.000Z

367

Gas marketing: Does size equal survival?  

SciTech Connect

The thought is enough to make many homeowners cringe: competing natural gas marketers calling them at home in the evening, pushing their brands and services much like AT and T, MCI and Sprint hawk long-distance telephone service today. Another thought is enough to make many gas marketers cringe: a half-dozen or fewer giant mega-marketers selling virtually all the natural gas in the US, and they and their company are not among them. Yet both thoughts are likely to become realities, say many in the natural gas industry. If so, each would represent an intriguing turn of events for the newest segment of the industry, one that barely existed 10 or 15 years ago. The paper discusses the recent history of the gas marketing sector, the changes taking place in the industry, and the biggest problem--the lack of a uniform electronic standard or bulletin board system for dispatching, nominating, and monitoring gas purchase as they move across the country.

Katz, M.G.

1996-02-01T23:59:59.000Z

368

The Plasma Puddle as a Perturbative Black Hole  

E-Print Network (OSTI)

We argue that the weak coupling regime of a large N gauge theory in the Higgs phase contains black hole-like objects. These so-called ``plasma puddles'' are meta-stable lumps of hot plasma lying in locally un-Higgsed regions of space. They decay via O(1/N) thermal radiation and, perhaps surprisingly, absorb all incident matter. We show that an incident particle of energy E striking the plasma puddle will shower into an enormous number of decay products whose multiplicity grows linearly with E, and whose average energy is independent of E. Once these ultra-soft particles reach the interior they are thermalized by the plasma within, and so the object appears ``black.'' We determine some gross properties like the size and temperature of the the plasma puddle in terms of fundamental parameters in the gauge theory. Interestingly, demanding that the plasma puddle emit thermal Hawking radiation implies that the object is black (i.e. absorbs all incident particles), which implies classical stability, which implies satisfaction of the Bekenstein entropy bound. Because of the AdS/CFT duality and the many similarities between plasma puddles and black holes, we conjecture that black objects are a robust feature of quantum gravity.

Clifford Cheung; Jared Kaplan

2007-04-09T23:59:59.000Z

369

Higgs Boson Production from Black Holes at the LHC  

E-Print Network (OSTI)

If the fundamental Planck scale is near a TeV, then TeV scale black holes should be produced in proton-proton collisions at the LHC where \\sqrt{s} = 14 TeV. As the temperature of the black holes can be ~ 1 TeV we also expect production of Higgs bosons from them via Hawking radiation. This is a different production mode for the Higgs boson, which would normally be produced via direct pQCD parton fusion processes. In this paper we compare total cross sections and transverse momentum distributions d\\sigma/dp_T for Higgs production from black holes at the LHC with those from direct parton fusion processes at next-to-next-to-leading order and next-to-leading order respectively. We find that the Higgs production from black holes can be larger or smaller than the direct pQCD production depending upon the Planck mass and black hole mass. We also find that d\\sigma/dp_T of Higgs production from black holes increases as a function of p_T which is in sharp contrast with the pQCD predictions where d\\sigma/dp_T decreases so we suggest that the measurement of an increase in d\\sigma/dp_T as p_T increases for Higgs (or any other heavy particle) production can be a useful signature for black holes at the LHC.

Gouranga C. Nayak; J. Smith

2006-02-14T23:59:59.000Z

370

Black Holes and the Third Law of Thermodynamics  

E-Print Network (OSTI)

We discuss in the framework of black hole thermodynamics some aspects relative to the third law in the case of black holes of the Kerr-Newman family. In the light of the standard proof of the equivalence between the unattainability of the zero temperature and the entropic version of the third law it is remarked that the unattainability has a special character in black hole thermodynamics. Also the zero temperature limit which obtained in the case of very massive black holes is discussed and it is shown that a violation of the entropic version in the charged case occurs. The violation of the Bekenstein-Hawking law in favour of zero entropy SE = 0 in the case of extremal black holes is suggested as a natural solution for a possible violation of the second law of thermodynamics. Thermostatic arguments in support of the unattainability are explored, and SE = 0 for extremal black holes is shown to be again a viable solution. The third law of black hole dynamics by W.Israel is then interpreted as a further strong corroboration to the picture of a discontinuity between extremal states and non-extremal ones. PACS: 04.70.Dy, 05.70.-a 1.

F. Belgiorno; M. Martellini

2005-01-01T23:59:59.000Z

371

SITE ENVIRONMENTAL REPORT 2000 (SEPTEMBER 2001).  

Science Conference Proceedings (OSTI)

Brookhaven National Laboratory (BNL) strives for excellence in both its science research and its facility operations. BNL manages its world-class scientific research with particular sensitivity to environmental and community issues through its internationally recognized Environmental Management System (EMS) and award-winning community relations program. The Site Environmental Report 2000 (SER) summarizes the status of the Laboratory's environmental programs and performance, including the steady progress towards cleaning up the Laboratory site and fully integrating environmental stewardship into all facets of BNL's mission. BNL's motto, ''Exploring Earth's Mysteries... Protecting its Future,'' describes how the Laboratory approaches its work, with balance between science and the environment. One of the newest initiatives at the Laboratory, the Upton Ecological and Research Reserve, will permanently preserve 530 acres (212 hectares) of the Long Island Central Pine Barrens, a unique ecosystem of forests and wetlands. The Reserve sets aside 10% of BNL property for conservation and ecological research through a partnership between the U.S. Department of Energy (DOE) and the U.S. Fish and Wildlife Service. The Reserve provides habitat for approximately 27 endangered, threatened, or species of special concern, including the state-endangered eastern tiger salamander, state-threatened banded sunfish, and swamp darter, along with a number of other species found onsite, such as the wild turkey and red-tailed hawk.

BROOKHAVEN NATIONAL LABORTORY; PROJECT MANAGER BARBARA COX

2001-09-27T23:59:59.000Z

372

The world oil market and OPEC behavior: The leak-producer price leader model  

SciTech Connect

This is an economic study of the world's oil market in which OPEC plays the central role in determining the oil supply and price. Understanding OPEC's behavior is at the core of understanding the world's oil market. However, oil is a resource belonging to the family of natural resources known as exhaustible. We do not produce oil; we only extract and distribute a fixed amount of the resource over generations. Optimal extraction is a matter of concern to both suppliers and consumers. First, it is shown that using the traditional theory of producers behavior in the conventional commodity markets to explain extractors behavior in exhaustible resource markets is completely wrong. Second, current models of OPEC behavior are reviewed. Third, an alternative model is introduced. Previous authors have not directed their models to give explanations to the peculiar observations in oil market. This model divides the world's oil suppliers into: the free riders (non-OPEC oil producers), the OPEC hawks (a group within OPEC) and the leak-producer price leader (Saudi Arabia). Three factors, namely relatively big oil reserves, no other sources of income, and the avoidance of the so-called backstop technology make Saudi Arabia more interested in lower oil prices than are other oil extractors.

Aboalela, A.A.

1988-01-01T23:59:59.000Z

373

CANDELS Multiwavelength catalogs: Source Identification and Photometry in the CANDELS UKIDSS Ultra-Deep Survey Field  

E-Print Network (OSTI)

We present the multiwavelength - ultraviolet to mid-infrared - catalog of the UKIDSS Ultra-Deep Survey (UDS) field observed as part of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS). Based on publicly available data, the catalog includes: the CANDELS data from the Hubble Space Telescope (near-infrared WFC3 F125W and F160W data and visible ACS F606W and F814W data), u-band data from CFHT/Megacam, B, V, Rc, i' and z' band data from Subaru/Suprime-Cam, Y and Ks band data from VLT/HAWK-I, J, H and K bands data from UKIDSS (Data Release 8), and Spitzer/IRAC data (3.6, 4.5 from SEDS, 5.8 and 8.0um from SpUDS). The present catalog is F160W-selected and contains 35932 sources over an area of 201.7 square arcmin and includes radio and X-ray detected sources and spectroscopic redshifts available for 210 sources.

Galametz, Audrey; Fontana, Adriano; Ferguson, Henry C; Ashby, M L N; Barro, Guillermo; Castellano, Marco; Dahlen, Tomas; Donley, Jennifer L; Faber, Sandy M; Grogin, Norman; Guo, Yicheng; Huang, Kuang-Han; Kocevski, Dale D; Koekemoer, Anton M; Lee, Kyoung-Soo; McGrath, Elizabeth J; Peth, Michael; Willner, S P; Almaini, Omar; Cooper, Michael; Cooray, Asantha Roshan; Conselice, Christopher J; Dickinson, Mark; Dunlop, James S; Fazio, G G; Foucaud, Sebastien; Gardner, Jonathan P; Giavalisco, Mauro; Hathi, N P; Hartley, Will G; Koo, David C; Lai, Kamson; de Mello, Duilia F; McLure, Ross J; Lucas, Ray A; Paris, Diego; Pentericci, Laura; Santini, Paola; Simpson, Chris; Sommariva, Veronica; Targett, Thomas; Weiner, Benjamin J; Wuyts, Stijn

2013-01-01T23:59:59.000Z

374

2012 SARA Students Technical Report  

Science Conference Proceedings (OSTI)

The Service Academy Research Associates (SARA) program provides an opportunity for Midshipmen and Cadets from US Service Academies to participate in research at Los Alamos National Laboratory (LANL), Lawrence Livermore National Laboratory (LLNL), and Sandia National Laboratory for several weeks during the summer as part of their summer training assignments. During the summer of 2012, three Midshipmen were assigned to work with the XCP Division at LANL for approximately 5-6 weeks. As one of the nation's top national security science laboratories, LANL stretches across 36 square miles, has over 2,100 facilities, and employs over 9,000 individuals including a significant number of students and postdocs. LANL's mission is to 'apply science and technology to: ensure the safety, security, and reliability of the US nuclear deterrent, reduce global threats, and solve other emerging national security challenges.' While LANL officially operates under the US Department of Energy (DoE), fulfilling this mission requires mutual cooperation with the US Department of Defense (DoD) as well. LANL's high concentration of knowledge and experience provides interns a chance to perform research in many disciplines, and its connection with the DoD in both operation and personnel gives SARA students insight to career possibilities both during and after military service. SARA students have plenty of opportunity to enjoy hiking, camping, the Los Alamos YMCA, and many other outdoor activities in New Mexico while staying at the Buffalo Thunder Resort, located 20 miles east of the lab. XCP Division is the Computational Physics division of LANL's Weapons Department. Working with XCP Division requires individuals to be Q cleared by the DoE. This means it is significantly more convenient for SARA students to be assigned to XCP Division than their civilian counterparts as the DoD CNWDI clearance held by SARA students is easily transferred to the lab prior to the students arriving at the start of the summer. SARA students working with XCP Division were given a comprehensive introduction into nuclear engineering and physics, nuclear weapons, and radiation transport and detection via texts and lectures at various classification levels. Students also attended tours of several prominent facilities at LANL including TA-41 Ice House, TA-55 PF-4 plutonium facility, the Nicholas C. Metropolis Center for Modeling and Simulation, also known as the Secure Computing Center (SCC), and the Dual-Axis Radiological Hydro Test (DARHT) facility; in addition, SARA students accompanied by LANL staff traveled to Minot AFB in North Dakota for tours of the 5th Bomb Wing and 91st Missile Wing facilities. Students participated in a week long class on the Monte Carlo N Particle (MCNP) code to supplement their understanding of radiation transport simulations. SARA students were then tasked with using this knowledge to model radiation detectors and use MCNP to compare their models to experimental data and previously accepted models.

Briccetti, Angelo [Los Alamos National Laboratory; Lorei, Nathan [Los Alamos National Laboratory; Yonkings, David [Los Alamos National Laboratory; Lorio, David [Los Alamos National Laboratory; Goorley, John T. [Los Alamos National Laboratory; Sood, Avneet [Los Alamos National Laboratory

2012-07-30T23:59:59.000Z

375

Global lightning and severe storm monitoring from GPS orbit  

Science Conference Proceedings (OSTI)

Over the last few decades, there has been a growing interest to develop and deploy an automated and continuously operating satellite-based global lightning mapper [e.g. Christian et al., 1989; Weber et al., 1998; Suszcynsky et al., 2000]. Lightning is a direct consequence of the electrification and breakdown processes that take place during the convective stages of thunderstorm development. Satellite-based lightning mappers are designed to exploit this relationship by using lightning detection as a proxy for remotely identifying, locating and characterizing strong convective activity on a global basis. Global lightning and convection mapping promises to provide users with (1) an enhanced global severe weather monitoring and early warning capability [e.g. Weber et al., 1998] (2) improved ability to optimize aviation flight paths around convective cells, particularly over oceanic and remote regions that are not sufficiently serviced by existing weather radar [e.g. Weber et al., 1998], and (3) access to regional and global proxy data sets that can be used for scientific studies and as input into meteorological forecast and global climatology models. The physical foundation for satellite-based remote sensing of convection by way of lightning detection is provided by the basic interplay between the electrical and convective states of a thundercloud. It is widely believed that convection is a driving mechanism behind the hydrometeor charging and transport that produces charge separation and lightning discharges within thunderclouds [e.g. see chapter 3 in MacGorman and Rust, 1998]. Although cloud electrification and discharge processes are a complex function of the convective dynamics and microphysics of the cloud, the fundamental relationship between convection and electrification is easy to observe. For example, studies have shown that the strength of the convective process within a thundercell can be loosely parameterized (with large variance) by the intensity of the electrical activity within that cell as measured by the lightning flash rate. Williams [2001] has provided a review of experimental work that shows correlations between the total lightning flash rate and the fifth power of the radar cloud-top height (i.e. convective strength) of individual thunder cells. More recently, Ushio et al., [2001] used a large statistical sampling of optical data from the Lightning Imaging Sensor (LIS) in conjunction with data provided by the Precipitation Radar (PR) aboard the Tropical Rainfall Monitoring Mission (TRMM) satellite to conclude that the total lightning flash rate increases exponentially with storm height. Lightning activity levels have also been correlated to cloud ice content, a basic product of the convective process. For example, Blyth et al. [2001] used the Thermal Microwave Imager (TMI) aboard the TRMM satellite to observe a decrease in the 37 and 85 GHz brightness temperatures of upwelling terrestrial radiation during increased lightning activity. This reduction in brightness temperature is believed to be the result of increased ice scattering in the mixed phase region of the cloud. Toracinta and Zipser [2001] have found similar relationships using the Optical Transient Detector (OTD) satellite instrument and the Special Sensor Microwave Imager (SSM/I) aboard the DMSP satellites.

Suszcynsky, D. M. (David M.); Jacobson, A. R.; Linford, J (Justin); Pongratz, M. B. (Morris B.); Light, T. (Tracy E.); Shao, X. (Xuan-Min)

2004-01-01T23:59:59.000Z

376

Ecological Monitoring and Compliance Program Fiscal Year 2000 Report  

SciTech Connect

The Ecological Monitoring and Compliance program, funded through the U.S. Department of Energy, Nevada Operations Office, monitors the ecosystem of he Nevada Test Site (NTS) and ensures compliance with laws and regulations pertaining to NTS biota. This report summarizes the program's activities conducted by Bechtel Nevada during fiscal year 2000. Program activities included: (1) biological surveys at proposed construction sites, (2) desert tortoise compliance,(3) ecosystem mapping, (4) sensitive species and unique habitat monitoring, and (5) biological monitoring at the HAZMAT Spill Center. Biological surveys for the presence of sensitive species were conducted for 24 NTS projects. Seventeen sites were in desert tortoise habitat, and six acres of tortoise habitat were documented as being disturbed this year. No tortoises were found in or displaced from project areas, and no tortoises were accidentally injured or killed. A topical report describing the classification of habitat types o n the NTS was completed. The report is the culmination of three years of field vegetation mapping and the analysis of vegetation data from over 1,500 ecological landform units. A long-term monitoring plan for important plant species that occur on the NTS was completed. Sitewide inventories were conducted for the western burrowing owl, bat species of concern, wild horses, raptor nests, and mule deer. Fifty-nine of 69 known owl burrows were monitored. Forty-four of the known burrows are in disturbed habitat. As in previous years, some owls were present year round on the NTS. An overall decrease in active owl burrows was observed within all three ecoregions (Mojave Desert, Transition, Great Basin Desert) from October through January. An increase in active owl burrows was observed from mid-March to early April. A total of 45 juvenile owls was detected from eight breeding pairs. One nest burrow was detected in the Mojave Desert,one in the Great Basin Desert, and six in the Transition ecoregion. Seventy bats, representing four bat species of concern, were captured in mist-nets at water sources in the Great Basin Desert ecoregion. Bats were detected with the Anabat II call-recording system at selected tunnel and mine entrances verifying that some NTS mines and tunnels are used as bat roosts. Thirty-seven adult horses and 11 foals were counted this year. Four of the five foals observed last year have survived to yearlings. A monitoring plan for NTS horses was completed. Six active red-tailed hawk nests and 10 nestling red-tailed hawks were detected this year. Two spotlighting surveys for mule deer were conducted, each over three consecutive nights in October 1999 and August 2000. The mean sighting rate in October was 1.2 deer/10 kilometers (km) and 1.6 deer/10 km in August. Selected wetlands and man-made water sources were monitored for physical parameters and wildlife use. No dead animals were observed this year in any plastic-lined sump. Pahute Mesa Pond was confirmed to have vegetation,hydrology, and soil indicators that qualify the site as a jurisdictional wetland. The chemical spill test plan for one experiment at the HAZMAT Spill Center was reviewed for its potential to impact biota downwind of spills on Frenchman Lake playa.

Wills, C.A.

2000-12-01T23:59:59.000Z

377

9PFermi 9/3/99  

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

B B a c k t o t h e F u t u r e 6 S u m m e r i n C y b e r s p a c e 8 H o w T h e y S p e n t t h e S u m m e r o f Õ 9 9 1 0 E x p e r i m e n t e r s B e t O n N e w S o f t w a r e 1 3 Ta l k o f t h e L a b MiniBooNE 2 F E R M I L A B A U. S. D E P A R T M E N T O F E N E R G Y L A B O R A T O R Y F N E E R W M S I Volume 22 Friday, September 3, 1999 Number 17 f Photo by Reidar Hahn Since the last installment in our series on the fledgling MiniBooNE experiment, physicists have been busy hawking their research proposal to the Department of Energy and the National Science Foundation. Both agencies promptly committed funds, and one mysterious well-wisher in New York City even sent in a $40 check. With money nearly in hand, the MiniBooNE scientists and engineers set to work six months ago on the final design for their detector and began pulling together a bid package for its construction. Their goal was to have construction underway

378

Bird Nest Predation  

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

Bird Nest Predation Bird Nest Predation Name: Susan Location: N/A Country: N/A Date: N/A Question: On the 18th of April, a pair of Northern Cardinals selected a nest site near the top of a dense, 8 foot holly tree, a foundation planting that obscures about 1/4 of our open front porch. They located the nest under the overhang of the roof, facing our front door. By the 21st, a clutch of three eggs had been laid and Mrs. C began to sit on the nest. We succeeded at keeping a low profile, despite the near proximity to our main entrance. She was relaxed and seemingly unworried by our quiet comings and goings. Yesterday morning, all was well, but sometime around midday, after almost a week of incubation, all three eggs and, it appears, Mrs. C, vanished without a trace! There is no obvious disturbance or damage to the nest or the immediate area. The interior of the nest is pristine ~ no feathers, eggshell bits, membrane material. Cats are rarely a problem. In addition to the typical Blue Jays and Crows, we have a lot of squirrels, raccoons, opossums, skunks and even a pair of red-tail hawks on our wooded acre and the surrounds. Due to, I believe, some nearby housing construction, I have observed a opossum during the day several times this past week and have noticed a new arrival, a woodchuck. With temperatures in the 50's, I think it is too chilly for snakes to be active. What would be your best guess as to what happened? Any chance the pair will return to the same nest and try again?

379

Sources of cosmic microwave radiation and dark matter identified: millimeter black holes (m.b.h.)  

E-Print Network (OSTI)

The universe is filled with blackbody millimeter radiation (CMBR), temperature 2.7{\\deg} Kelvin[1]. Big-bang cosmology explains this by the initial thermalization of photons scattered by electrons[2]. This explanation requires ad hoc previous existence of photons and thermal electrons. On the other hand most of the mass of the universe is unknown dark matter3. It explains anomalous dynamical properties, like that of stars in galaxies[4,5,6] . Alternatively the anomalies have been explained by adjusting and modifying well known laws ("Modified Newtonian dynamics"[7]). Here we show that millimeter black holes (m.b.h.) explain both: the background radiation, by its partial "evaporation", and the dark matter. Black holes emit blackbody radiation (Hawking[8] evaporation), and this is what is observed in the CMBR. Millimeter size black holes emit blackbody radiation at a temperature of 2.7{\\deg} Kelvin, and this is the resulting CMBR . Partial evaporation of ~10^30 m.b.h. gives the observed background field of photons being emitted and absorbed at the same rate by the m.b.h. The number of photons is constant, as observed. Their temperature decreases with time because the mass of the m.b.h. (and therefore its size) increases with time (the mass-boom effect[9]). The total mass of the m.b.h. is the dark matter. Hence dark matter is not so "dark" after all. Two important cosmological items are here identified by only one source: millimeter black holes.

Antonio Alfonso-Faus; Marius Josep Fullana i Alfonso

2010-04-13T23:59:59.000Z

380

A pilot golden eagle population study in the Altamont Pass Wind Resource Area, California  

Science Conference Proceedings (OSTI)

Orloff and Flannery (1992) estimated that several hundred reports are annually killed by turbine collisions, wire strikes, and electrocutions at the Altamont Pass Wind Resource Area (WRA). The most common fatalities were those of red-tailed hawks (Buteo jamaicensis), American kestrels (Falco sparvatius), and golden eagles (Aquila chrysaetos), with lesser numbers of turkey vultures (Cathartes aura), common ravens (Corvus corax), bam owls (Tyto alba), and others. Among the species of raptors killed at Altamont Pass, the one whose local population is most likely to be impacted is the golden eagle. Besides its being less abundant than the others, the breeding and recruitment rates of golden eagles are naturally slow, increasing their susceptibility to decline as a result of mortality influences. The golden eagle is a species afforded special federal protection because of its inclusion within the Bald Eagle Protection Act as amended in 1963. There are no provisions within the Act which would allow the killing ``taking`` of golden eagles by WRA structures. This report details the results of field studies conducted during 19941. The primary purpose of the investigation is to lay the groundwork for determining whether or not turbine strikes and other hazards related to energy at Altamont Pass may be expected to affect golden eagles on a population basis. We also seek an understanding of the physical and biotic circumstances which attract golden eagles to the WRA within the context of the surrounding landscape and the conditions under which they are killed by wind turbines. Such knowledge may suggest turbine-related or habitat modifications that would result in a lower incidence of eagle mortality.

Hunt, G. [California Univ., Santa Cruz, CA (United States). Predatory Bird Research Group

1995-05-01T23:59:59.000Z

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381

Using a collision model to design safer wind turbine rotors for birds  

Science Conference Proceedings (OSTI)

A mathematical model for collisions between birds and propeller-type turbine rotors identifies the variables that can be manipulated to reduce the probability that birds will collide with the rotor. This study defines a safety index--the clearance power density--that allows rotors of different sizes and designs to be compared in terms of the amount of wind energy converted to electrical energy per bird collision. The collision model accounts for variations in wind speed during the year and shows that for model rotors with simple, one-dimensional blades, the safety index increases in proportion to rotor diameter, and variable speed rotors have higher safety indexes than constant speed rotors. The safety index can also be increased by enlarging the region near the center of the rotor hub where the blades move slowly enough for birds to avoid them. Painting the blades to make them more visible might have this effect. Model rotors with practical designs can have safety indexes an order of magnitude higher than those for model rotors typical of the constant speeds rotors in common use today. This finding suggests that redesigned rotors could have collision rates with birds perhaps an order of magnitude lower than today`s rotors, with no reduction in the production of wind power. The empirical data that exist for collisions between raptors, such as hawks and eagles, and rotors are consistent with the model: the numbers of raptor carcasses found beneath large variable speed rotors, relative to the numbers found under small constant speed rotors, are in the proportions predicted by the collision model rather than in proportion to the areas swept by the rotor blades. However, uncontrolled variables associated with these data prevent a stronger claim of support for the model.

Tucker, V.A. [Duke Univ., Durham, NC (United States). Dept. of Zoology

1996-11-01T23:59:59.000Z

382

The Kerr/CFT correspondence  

Science Conference Proceedings (OSTI)

Quantum gravity in the region very near the horizon of an extreme Kerr black hole (whose angular momentum and mass are related by J=GM{sup 2}) is considered. It is shown that consistent boundary conditions exist, for which the asymptotic symmetry generators form one copy of the Virasoro algebra with central charge c{sub L}=(12J/({Dirac_h}/2{pi})). This implies that the near-horizon quantum states can be identified with those of (a chiral half of) a two-dimensional conformal field theory (CFT). Moreover, in the extreme limit, the Frolov-Thorne vacuum state reduces to a thermal density matrix with dimensionless temperature T{sub L}=(1/2{pi}) and conjugate energy given by the zero mode generator, L{sub 0}, of the Virasoro algebra. Assuming unitarity, the Cardy formula then gives a microscopic entropy S{sub micro}=(2{pi}J/({Dirac_h}/2{pi})) for the CFT, which reproduces the macroscopic Bekenstein-Hawking entropy S{sub macro}=(Area/4({Dirac_h}/2{pi})G). The results apply to any consistent unitary quantum theory of gravity with a Kerr solution. We accordingly conjecture that extreme Kerr black holes are holographically dual to a chiral two-dimensional conformal field theory with central charge c{sub L}=(12J/({Dirac_h}/2{pi})), and, in particular, that the near-extreme black hole GRS 1915+105 is approximately dual to a CFT with c{sub L}{approx}2x10{sup 79}.

Guica, Monica [Laboratoire de Physique Theorique et Hautes Energies, Universite Pierre et Marie Curie-Paris 6, CNRS Boite 126, 4 Pl. Jussieu, 75252 Paris Cedex 05 (France); Hartman, Thomas; Song Wei; Strominger, Andrew [Center for the Fundamental Laws of Nature, Jefferson Physical Laboratory, Harvard University, Cambridge, Massachusetts 02138 (United States)

2009-12-15T23:59:59.000Z

383

Ecological survey for the siting of the Mixed and Low-Level Waste Treatment Facility and the Idaho Waste Processing Facility  

SciTech Connect

This report summarizes the results of field ecological surveys conducted by the Center for Integrated Environmental Technologies (CIET) on the Idaho National Engineering Laboratory (INEL) at four candidate locations for the siting of the Mixed and Low-Level Waste Treatment Facility (MLLWTF) and the Idaho Waste Processing Facility (IWPF). The purpose of these surveys was to comply with all Federal laws and Executive Orders to identify and evaluate any potential environmental impacts because of the project. The boundaries of the candidate location were marked with blaze-orange lath survey marker stakes by the project management. Global Positioning System (GPS) measurements of the marker stakes were made, and input to the Arc/Info{reg_sign} geographic information system (GIS). Field surveys were conducted to assess any potential impact to any important species, important habitats, and to any environmental study areas. The GIS location data was overlayed onto the INEL vegetation map and an analysis of vegetation classes on the locations was done. Results of the field surveys indicate use of Candidate Location {number_sign}1 by pygmy rabbits (Sylvilagus idahoensis) and expected use by them of Candidate Locations {number_sign}3 and {number_sign}9. Pygmy rabbits are categorized as a C2 species by the US Fish and Wildlife Service (USFWS). Two other C2 species, the ferruginous hawk (Buteo regalis) and the loggerhead shrike (Lanius ludovicianus) would also be expected to frequent the candidate locations. Candidate Location {number_sign}5 at the north end of the INEL is in the winter range of a large number of pronghorn antelope (Antilocapra americana).

Hoskinson, R.L.

1994-05-01T23:59:59.000Z

384

Ecological Monitoring and Compliance Program Fiscal Year 2002 Report (Part Two of Two)  

SciTech Connect

The Ecological Monitoring and Compliance program, funded through the U.S. Department of Energy, National Nuclear Security Administration Nevada Operations Office, monitors the ecosystem of the Nevada Test Site (NTS) and ensures compliance with laws and regulations pertaining to NTS biota. This report summarizes the program's activities conducted by Bechtel Nevada (BN) during fiscal year 2002. Program activities included: (1) biological surveys at proposed construction sites, (2) desert tortoise compliance, (3) ecosystem mapping and data management, (4) sensitive species and unique habitat monitoring, and (5) biological monitoring at the HAZMAT Spill Center. Biological surveys for the presence of sensitive species and important biological resources were conducted for 26 NTS projects. These projects have the potential to disturb a total of 374 acres. Thirteen of the projects were in desert tortoise habitat, and 13.38 acres of desert tortoise habitat were disturbed. No tortoises were found in or displaced from project areas, and no tortoises were accidentally injured or killed at project areas or along paved roads. Compilation of historical wildlife data continued this year in efforts to develop faunal distribution maps for the NTS. Photographs associated with the NTS ecological landform units sampled to create the NTS vegetation maps were cataloged for future retrieval and analysis. The list of sensitive plant species for which long-term population monitoring is scheduled was revised. Six vascular plants and five mosses were added to the list. Plant density estimates from ten populations of Astragalus beatleyae were collected, and eight known populations of Eriogonum concinnum were visited to assess plant and habitat status. Minimal field monitoring of western burrowing owl burrows occurred. A report relating to the ecology of the western burrowing owl on the Nevada Test Site was prepared which summarizes four years of data collected on this species' distribution, burrow use, reproduction, activity patterns, and food habits. Bat roost sites within seven buildings slated for demolition were identified, and a BN biologist was a contributing author of the Nevada Bat Conservation Plan published by the Nevada Bat Working Group. Thirty-three adult horses and five foals were counted this year. Six active raptor nests (two American kestrel, two Red-tailed hawk, and two Great-horned owl nests) were found and monitored this year. Selected wetlands and man-made water sources were monitored for physical parameters and wildlife use. No dead animals were observed this year in any plastic-lined sump. The chemical release test plan for one experiment at the HAZMAT Spill Center on Frenchman Lake playa was reviewed. Seasonal sampling of downwind and upwind transects near the spill center was conducted to document baseline conditions of biota.

C. A. Wills

2002-12-01T23:59:59.000Z

385

Ecological Monitoring and Compliance Program Fiscal Year 2001  

SciTech Connect

The Ecological Monitoring and Compliance program, funded through the U.S. Department of Energy, National Nuclear Security Administration Nevada Operations Office, monitors the ecosystem of the Nevada Test Site (NTS) and ensures compliance with laws and regulations pertaining to NTS biota. This report summarizes the program's activities conducted by Bechtel Nevada during fiscal year 2001. Program activities included: (1) biological surveys at proposed construction sites, (2) desert tortoise compliance, (3) ecosystem mapping and data management, (4) sensitive species and unique habitat monitoring, and (5) biological monitoring at the HAZMAT Spill Center. Biological surveys for the presence of sensitive species were conducted for 23 NTS projects. Eleven sites were in desert tortoise habitat. These projects have the potential to disturb a total of 588 acres, where 568 acres of disturbance would be off-road driving. No tortoises were found in or displaced from project areas, and no tortoise s were accidentally injured or killed at project areas. One tortoise was crushed by a vehicle on a paved road. A topical report describing the classification of habitat types on the NTS was completed and distributed. The report is the culmination of three years of field vegetation mapping and the analysis of vegetation data from over 1,500 ecological landform units. Compilation of historical wildlife data was initiated. A long-term monitoring plan for important plant species that occur on the NTS was completed. Site-wide monitoring was conducted for the western burrowing owl, bat species of concern, wild horses, and raptor nests. Sixty-nine of 77 known owl burrows were monitored. As in previous years, some owls were present year round on the NTS. An overall decrease in active owl burrows was observed within all three ecoregions (Mojave Desert, Transition, Great Basin Desert) from October through January. An increase in active owl burrows was observed from mid March to early April. A total of 55 juvenile owls was detected from 11 breeding pairs. Pellet analysis of burrowing owls was completed which identified key prey species. A total of 272 bats, representing 10 bat species were captured in mist-nets at water sources in the Great Basin Desert ecoregion. Bats were detected with the Anabat II call-recording system at water sources and selected tunnel and mine entrances. Thirty-seven adult horses and 11 foals were counted this year. Two of the eleven foals observed last year survived to yearlings. Seven active raptor nests were found and monitored this year. These included two Great-horned Owl nests, three Barn Owl nests, and two Red-tailed Hawk nests. Selected wetlands and man-made water sources were monitored for physical parameters and wildlife use. No dead animals were observed this year in any plastic-lined sump. The chemical spill test plans for four experiments at the HAZMAT Spill Center were reviewed for their potential to impact biota downwind of spills on Frenchman Lake playa.

C. A. Wills

2001-12-01T23:59:59.000Z