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


1

Axisymmetric equilibrium models for magnetized neutron stars in General Relativity under the Conformally Flat Condition  

E-Print Network [OSTI]

Extremely magnetized neutron stars with magnetic fields as strong as $\\sim 10^{15-16}$ G, or magnetars, have received considerable attention in the last decade due to their identification as a plausible source for Soft Gamma Repeaters and Anomalous X-ray Pulsars. Moreover, this class of compact objects has been proposed as a possible engine capable of powering both Long and Short Gamma-Ray Bursts, if the rotation period in their formation stage is short enough (~1 ms). Such strong fields are expected to induce substantial deformations of the star and thus to produce the emission of gravitational waves. Here we investigate, by means of numerical modeling, axisymmetric static equilibria of polytropic and strongly magnetized stars in full general relativity, within the ideal magneto-hydrodynamic regime. The eXtended Conformally Flat Condition (XCFC) for the metric is assumed, allowing us to employ the techniques introduced for the X-ECHO code [Bucciantini & Del Zanna, 2011, Astron. Astrophys. 528, A101], pro...

Pili, A G; Del Zanna, L

2014-01-01T23:59:59.000Z

2

Flat | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 NoPublicIDAPowerPlantSitingConstruction.pdfNotify98.pdf Jump to:Siting.pdfFiskdale,Five StarFlash Steam512357°,Flat

3

Flattening Scientific CCD Imaging Data with a Dome Flat Field System  

E-Print Network [OSTI]

We describe the flattening of scientific CCD imaging data using a dome flat field system. The system uses light emitting diodes (LEDs) to illuminate a carefully constructed dome flat field screen. LEDs have several advantages over more traditional illumination sources: they are available in a wide range of output wavelengths, are inexpensive, have a very long source lifetime, and are straightforward to control digitally. The circular dome screen is made of a material with Lambertian scattering properties that efficiently reflects light of a wide range of wavelengths and incident angles. We compare flat fields obtained using this new system with two types of traditionally-constructed flat fields: twilight sky flats and nighttime sky flats. Using photometric standard stars as illumination sources, we test the quality of each flat field by applying it to a set of standard star observations. We find that the dome flat field system produces flat fields that are superior to twilight or nighttime sky flats, particularly for photometric calibration. We note that a ratio of the twilight sky flat to the nighttime sky flat is flat to within the expected uncertainty; but since both of these flat fields are inferior to the dome flat, this common test is not an appropriate metric for testing a flat field. Rather, the only feasible and correct method for determining the appropriateness of a flat field is to use standard stars to measure the reproducibility of known magnitudes across the detector.

J. L. Marshall; D. L. DePoy

2005-10-07T23:59:59.000Z

4

Five points on columns  

E-Print Network [OSTI]

Column,” like “gene,” has both conceptual and linguistic shortcomings. The simple question “what is a column” is not easy to answer and the word itself is not easy to replace. In the present article, I have selected five ...

Rockland, Kathleen

5

Chameleon stars  

SciTech Connect (OSTI)

We consider a gravitating spherically symmetric configuration consisting of a scalar field nonminimally coupled to ordinary matter in the form of a perfect fluid. For this system we find static, regular, asymptotically flat solutions for both relativistic and nonrelativistic cases. It is shown that the presence of the nonminimal interaction leads to substantial changes both in the radial matter distribution of the star and in the star's total mass. A simple stability test indicates that, for the choice of parameters used in the paper, the solutions are unstable.

Dzhunushaliev, Vladimir [Institute for Basic Research, Eurasian National University, Astana, 010008 (Kazakhstan); Institute of Physicotechnical Problems and Material Science of the NAS of the Kyrgyz Republic, 265 a, Chui Street, Bishkek, 720071 (Kyrgyzstan); Folomeev, Vladimir [Institute of Physicotechnical Problems and Material Science of the NAS of the Kyrgyz Republic, 265 a, Chui Street, Bishkek, 720071 (Kyrgyzstan); Singleton, Douglas [Institute for Basic Research, Eurasian National University, Astana, 010008 (Kazakhstan); Physics Department, CSU Fresno, Fresno, California 93740-8031 (United States)

2011-10-15T23:59:59.000Z

6

Glass-silicon column  

DOE Patents [OSTI]

A glass-silicon column that can operate in temperature variations between room temperature and about 450.degree. C. The glass-silicon column includes large area glass, such as a thin Corning 7740 boron-silicate glass bonded to a silicon wafer, with an electrode embedded in or mounted on glass of the column, and with a self alignment silicon post/glass hole structure. The glass/silicon components are bonded, for example be anodic bonding. In one embodiment, the column includes two outer layers of silicon each bonded to an inner layer of glass, with an electrode imbedded between the layers of glass, and with at least one self alignment hole and post arrangement. The electrode functions as a column heater, and one glass/silicon component is provided with a number of flow channels adjacent the bonded surfaces.

Yu, Conrad M.

2003-12-30T23:59:59.000Z

7

Nuclear reactor control column  

DOE Patents [OSTI]

The nuclear reactor control column comprises a column disposed within the nuclear reactor core having a variable cross-section hollow channel and containing balls whose vertical location is determined by the flow of the reactor coolant through the column. The control column is divided into three basic sections wherein each of the sections has a different cross-sectional area. The uppermost section of the control column has the greatest cross-sectional area, the intermediate section of the control column has the smallest cross-sectional area, and the lowermost section of the control column has the intermediate cross-sectional area. In this manner, the area of the uppermost section can be established such that when the reactor coolant is flowing under normal conditions therethrough, the absorber balls will be lifted and suspended in a fluidized bed manner in the upper section. However, when the reactor coolant flow falls below a predetermined value, the absorber balls will fall through the intermediate section and into the lowermost section, thereby reducing the reactivity of the reactor core and shutting down the reactor.

Bachovchin, Dennis M. (Plum Borough, PA)

1982-01-01T23:59:59.000Z

8

Nuclear reactor control column  

SciTech Connect (OSTI)

The nuclear reactor control column comprises a column disposed within the nuclear reactor core having a variable cross-section hollow channel and containing balls whose vertical location is determined by the flow of the reactor coolant through the column. The control column is divided into three basic sections wherein each of the sections has a different cross-sectional area. The uppermost section of the control column has the greatest crosssectional area, the intermediate section of the control column has the smallest cross-sectional area, and the lowermost section of the control column has the intermediate cross-sectional area. In this manner, the area of the uppermost section can be established such that when the reactor coolant is flowing under normal conditions therethrough, the absorber balls will be lifted and suspended in a fluidized bed manner in the upper section. However, when the reactor coolant flow falls below a predetermined value, the absorber balls will fall through the intermediate section and into the lowermost section, thereby reducing the reactivity of the reactor core and shutting down the reactor.

Bachovchin, D.M.

1982-08-10T23:59:59.000Z

9

Ghost condensate model of flat rotation curves  

E-Print Network [OSTI]

An effective action of ghost condensate with higher derivatives creates a source of gravity and mimics a dark matter in spiral galaxies. We present a spherically symmetric static solution of Einstein--Hilbert equations with the ghost condensate at large distances, where flat rotation curves are reproduced in leading order over small ratio of two energy scales characterizing constant temporal and spatial derivatives of ghost field: $\\mu_*^2$ and $\\mu_\\star^2$, respectively, with a hierarchy $\\mu_\\star\\ll \\mu_*$. We assume that a mechanism of hierarchy is provided by a global monopole in the center of galaxy. An estimate based on the solution and observed velocities of rotations in the asymptotic region of flatness, gives $\\mu_*\\sim 10^{19}$ GeV and the monopole scale in a GUT range $\\mu_\\star\\sim 10^{16}$ GeV, while a velocity of rotation $v_0$ is determined by the ratio: $ \\sqrt{2} v_0^2= \\mu_\\star^2/\\mu_*^2$. A critical acceleration is introduced and naturally evaluated of the order of Hubble rate, that represents the Milgrom's acceleration.

V. V. Kiselev

2005-07-29T23:59:59.000Z

10

Is flat fair?  

SciTech Connect (OSTI)

Dynamic pricing holds out the promise of shifting peak demand as well as reducing overall demand. But it also raises thorny issues of fairness. All practical pricing systems involve tradeoffs between equity and efficiency. I examine the circumstances under which equity ought to be allowed to trump efficiency and whether or not this constitutes a defense of flat pricing. (author)

Bunzl, Martin

2010-07-15T23:59:59.000Z

11

The Theoryof Maximally Flat  

E-Print Network [OSTI]

TRANSACTIONSON AUDIO AND ELECTROACOUSTICS, VOL. AU-20, NO. 3, AUGUST 1972 dynamic drag of the voice coil be made as flat as thedesigner'sconstraints permit. II. Theory Let the dc resistance of the voice coil, rl the mechanical re- sistance of the cone suspension, and SIthe suspension stiff- ness or spring

California at Berkeley, University of

12

Eruption column physics  

SciTech Connect (OSTI)

In this paper the author focuses on the fluid dynamics of large-scale eruption columns. The dynamics of these columns are rooted in multiphase flow phenomena, so a major part of the paper sets up a foundation on that topic that allows one to quickly assess the inherent assumptions made in various theoretical and experimental approaches. The first part is centered on a set of complex differential equations that describe eruption columns, but the focus is on a general understanding of important physical processes rather than on the mathematics. The author discusses briefly the relative merits and weaknesses of different approaches, emphasizing that the largest advances in understanding are made by combining them. He then focuses on dynamics of steady eruption columns and then on transient phenomena. Finally he briefly reviews the effects of varying behavior of the ambient medium through which an eruption column moves. These final sections will emphasize concepts and a qualitative understanding of eruption dynamics. This paper relies on principles of continuum mechanics and transport processes but does not go into detail on the development of those principles. 36 refs., 36 figs., 3 tabs.

Valentine, G.A.

1997-03-01T23:59:59.000Z

13

Kentish Flats Offshore Wind Farm  

E-Print Network [OSTI]

Kentish Flats Offshore Wind Farm #12;By August 2005 the offshore wind farm at Kentish Flats plateau just outside the main Thames shipping lanes. The Kentish Flats wind farm will comprise 30 of the wind farm could be up to 90 MW. For the benefit of the environment The British Government has set

Firestone, Jeremy

14

Absolute calibration of optical flats  

DOE Patents [OSTI]

The invention uses the phase shifting diffraction interferometer (PSDI) to provide a true point-by-point measurement of absolute flatness over the surface of optical flats. Beams exiting the fiber optics in a PSDI have perfect spherical wavefronts. The measurement beam is reflected from the optical flat and passed through an auxiliary optic to then be combined with the reference beam on a CCD. The combined beams include phase errors due to both the optic under test and the auxiliary optic. Standard phase extraction algorithms are used to calculate this combined phase error. The optical flat is then removed from the system and the measurement fiber is moved to recombine the two beams. The newly combined beams include only the phase errors due to the auxiliary optic. When the second phase measurement is subtracted from the first phase measurement, the absolute phase error of the optical flat is obtained.

Sommargren, Gary E.

2005-04-05T23:59:59.000Z

15

Selected Topics in Column Generation  

E-Print Network [OSTI]

Dec 2, 2002 ... Page 1. Selected Topics in Column Generation. Marco E. Lübbecke ... is an ever recurring concept in our “selected topics.” OR/MS Subject ...

2002-12-02T23:59:59.000Z

16

Half-flat Quantum Hair  

E-Print Network [OSTI]

By wrapping D3-branes over 3-cycles on a half-flat manifold we construct an effective supersymmetric black hole in the N=2 low-energy theory in four-dimensions. Specifically we find that the torsion cycles present in a half-flat compactification, corresponding to the mirror symmetric image of electric NS flux on a Calabi-Yau manifold, manifest in the half-flat black hole as quantum hair. We compute the electric and magnetic charges related to the quantum hair, and also the mass contribution to the effective black hole. We find that by wrapping a number of D3-branes equal to the order of the discrete group associated to the torsional part of the half-flat homology, the effective charge and mass terms vanishes. We compute the variation of entropy and the corresponding temperature associated with the lost of quantum hair. We also comment on the equivalence between canceling Freed-Witten anomaly and the assumption of self-duality for the 5-form field strength. Finally from a K-theoretical perspective, we compute the presence of discrete RR charge of D-branes wrapping torsional cycles in a half-flat manifold.

Hugo Garcia-Compean; Oscar Loaiza-Brito; Aldo Martinez-Merino; Roberto Santos-Silva

2013-10-27T23:59:59.000Z

17

Self-regenerating column chromatography  

DOE Patents [OSTI]

The present invention provides a process for treating both cations and anions by using a self-regenerating, multi-ionic exchange resin column system which requires no separate regeneration steps. The process involves alternating ion-exchange chromatography for cations and anions in a multi-ionic exchange column packed with a mixture of cation and anion exchange resins. The multi-ionic mixed-charge resin column works as a multi-function column, capable of independently processing either cationic or anionic exchange, or simultaneously processing both cationic and anionic exchanges. The major advantage offered by the alternating multi-function ion exchange process is the self-regeneration of the resins.

Park, W.K.

1995-05-30T23:59:59.000Z

18

Thermal Analysis for Ion-Exchange Column System  

SciTech Connect (OSTI)

Models have been developed to simulate the thermal characteristics of crystalline silicotitanate ion exchange media fully loaded with radioactive cesium either in a column configuration or distributed within a waste storage tank. This work was conducted to support the design and operation of a waste treatment process focused on treating dissolved, high-sodium salt waste solutions for the removal of specific radionuclides. The ion exchange column will be installed inside a high level waste storage tank at the Savannah River Site. After cesium loading, the ion exchange media may be transferred to the waste tank floor for interim storage. Models were used to predict temperature profiles in these areas of the system where the cesium-loaded media is expected to lead to localized regions of elevated temperature due to radiolytic decay. Normal operating conditions and accident scenarios (including loss of solution flow, inadvertent drainage, and loss of active cooling) were evaluated for the ion exchange column using bounding conditions to establish the design safety basis. The modeling results demonstrate that the baseline design using one central and four outer cooling tubes provides a highly efficient cooling mechanism for reducing the maximum column temperature. In-tank modeling results revealed that an idealized hemispherical mound shape leads to the highest tank floor temperatures. In contrast, even large volumes of CST distributed in a flat layer with a cylindrical shape do not result in significant floor heating.

Lee, Si Y.; King, William D.

2012-12-20T23:59:59.000Z

19

Graphene folding on flat substrates  

SciTech Connect (OSTI)

We present a combined experimental-theoretical study of graphene folding on flat substrates. The structure and deformation of the folded graphene sheet are experimentally characterized by atomic force microscopy. The local graphene folding behaviors are interpreted based on nonlinear continuum mechanics modeling and molecular dynamics simulations. Our study on self-folding of a trilayer graphene sheet reports a bending stiffness of about 6.57?eV, which is about four times the reported values for monolayer graphene. Our results reveal that an intriguing free sliding phenomenon occurs at the interlayer van der Waals interfaces during the graphene folding process. This work demonstrates that it is a plausible venue to quantify the bending stiffness of graphene based on its self-folding conformation on flat substrates. The findings reported in this work are useful to a better understanding of the mechanical properties of graphene and in the pursuit of its applications.

Chen, Xiaoming; Zhao, Yadong; Ke, Changhong, E-mail: cke@binghamton.edu [Department of Mechanical Engineering, State University of New York at Binghamton, Binghamton, New York 13902 (United States); Zhang, Liuyang; Wang, Xianqiao [College of Engineering, University of Georgia, Athens, Georgia 30602 (United States)

2014-10-28T23:59:59.000Z

20

All conformally flat pure radiation metrics  

E-Print Network [OSTI]

The complete class of conformally flat, pure radiation metrics is given, generalising the metric recently given by Wils.

S. Brian Edgar; Garry Ludwig

1996-12-20T23:59:59.000Z

Note: This page contains sample records for the topic "flat column stars" 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

WASTEWATER TREATMENT OVER SAND COLUMNS  

E-Print Network [OSTI]

93/0096 WASTEWATER TREATMENT OVER SAND COLUMNS TREATMENT YIELDS, LOCALISATION OF THE BIOMASS Domestic wastewater treatment by infiltration-percolation is a process that becomming common in France, a greater depth for desinfection purposes. KEYWORDS Wastewater treatment, Infiltration-percolation. Sand

Paris-Sud XI, Université de

22

The Nature of Flat-Spectrum Nuclear Radio Emission in Seyfert Galaxies  

E-Print Network [OSTI]

Parsec-scale VLBA imaging of five Seyfert galaxies with flat-spectrum radio nuclei was conducted to determine whether the flat spectrum represents thermal emission from the accretion disk/obscuring torus or nonthermal, synchrotron self-absorbed emission. Four of the five show emission consistent with synchrotron self-absorption, with intrinsic sizes ~0.05-0.2 pc (or 10^4 gravitational radii for a 10^8 Msun black hole for the smallest). In contrast, NGC 4388, which was detected with MERLIN but not the VLBA, shows thermal emission with similar properties to that detected in NGC 1068. It is notable that the two Seyfert galaxies with detected thermal nuclear radio emission both have large X-ray absorbing columns, suggesting that columns in excess of \\~10^{24} cm^{-2} are needed for such disks to be detectable.

C. G. Mundell; A. S. Wilson; J. S. Ulvestad; A. L. Roy

2000-12-11T23:59:59.000Z

23

Windy Flats | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 NoPublic Utilities Address: 160 East 300 South Place:ReferenceEdit JumpWill County,Windspire EnergyFlats Jump to:

24

Natural star-products on symplectic manifolds and related quantum mechanical operators  

SciTech Connect (OSTI)

In this paper is considered a problem of defining natural star-products on symplectic manifolds, admissible for quantization of classical Hamiltonian systems. First, a construction of a star-product on a cotangent bundle to an Euclidean configuration space is given with the use of a sequence of pair-wise commuting vector fields. The connection with a covariant representation of such a star-product is also presented. Then, an extension of the construction to symplectic manifolds over flat and non-flat pseudo-Riemannian configuration spaces is discussed. Finally, a coordinate free construction of related quantum mechanical operators from Hilbert space over respective configuration space is presented. -- Highlights: •Invariant representations of natural star-products on symplectic manifolds are considered. •Star-products induced by flat and non-flat connections are investigated. •Operator representations in Hilbert space of considered star-algebras are constructed.

B?aszak, Maciej, E-mail: blaszakm@amu.edu.pl; Doma?ski, Ziemowit, E-mail: ziemowit@amu.edu.pl

2014-05-15T23:59:59.000Z

25

Independent Oversight Review, Rocky Flats Environmental Technology...  

Energy Savers [EERE]

- March 2000 March 2000 Review of the Rocky Flats Environmental Technology Site Transportation Emergency Management Program This report provides the results of an independent...

26

Flat-Plate Photovoltaic Module Basics  

Broader source: Energy.gov [DOE]

Flat-plate photovoltaic (PV) modules are made of several components, including the front surface materials, encapsulant, rear surface, and frame.

27

Two-Column Aerosol Project  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear SecurityTensile Strain Switched Ferromagnetism in Layeredof Energy Two CompaniesTwo Studies RevealTwoColumn

28

THERMAL MODELING ANALYSIS OF CST MEDIA IN THE SMALL COLUMN ION EXCHANGE PROJECT  

SciTech Connect (OSTI)

Models have been developed to simulate the thermal characteristics of Crystalline Silicotitanate (CST) ion exchange media fully loaded with radioactive cesium in a column configuration and distributed within a waste storage tank. This work was conducted to support the Small Column Ion Exchange (SCIX) program which is focused on processing dissolved, high-sodium salt waste for the removal of specific radionuclides (including Cs-137, Sr-90, and actinides) within a High Level Waste (HLW) storage tank at the Savannah River Site. The SCIX design includes CST columns inserted and supported in the tank top risers for cesium removal. Temperature distributions and maximum temperatures across the column were calculated with a focus on process upset conditions. A two-dimensional computational modeling approach for the in-column ion-exchange domain was taken to include conservative, bounding estimates for key parameters such that the results would provide the maximum centerline temperatures achievable under the design configurations using a feed composition known to promote high cesium loading on CST. One salt processing scenario includes the transport of the loaded (and possibly ground) CST media to the treatment tank floor. Therefore, additional thermal modeling calculations were conducted using a three-dimensional approach to evaluate temperature distributions for the entire in-tank domain including distribution of the spent CST media either as a mound or a flat layer on the tank floor. These calculations included mixtures of CST with HLW sludge or loaded Monosodium Titanate (MST) media used for strontium/actinide sorption. The current full-scale design for the CST column includes one central cooling pipe and four outer cooling tubes. Most calculations assumed that the fluid within the column was stagnant (i.e. no buoyancy-induced flow) for a conservative estimate. A primary objective of these calculations was to estimate temperature distributions across packed CST beds immersed in waste supernate or filled with dry air under various accident scenarios. Accident scenarios evaluated included loss of salt solution flow through the bed (a primary heat transfer mechanism), inadvertent column drainage, and loss of active cooling in the column. The calculation results showed that for a wet CST column with active cooling through one central and four outer tubes and 35 C ambient external air, the peak temperature for the fully-loaded column is about 63 C under the loss of fluid flow accident, which is well below the supernate boiling point. The peak temperature for the naturally-cooled (no active, engineered cooling) wet column is 156 C under fully-loaded conditions, exceeding the 130 C boiling point. Under these conditions, supernate boiling would maintain the column temperature near 130 C until all supernate was vaporized. Without active engineered cooling and assuming a dry column suspended in unventilated air at 35 C, the fully-loaded column is expected to rise to a maximum of about 258 C due to the combined loss-of coolant and column drainage accidents. The modeling results demonstrate that the baseline design using one central and four outer cooling tubes provides a highly efficient cooling mechanism for reducing the maximum column temperature. Results for the in-tank modeling calculations clearly indicate that when realistic heat transfer boundary conditions are imposed on the bottom surface of the tank wall, as much as 450 gallons of ground CST (a volume equivalent to two ion exchange processing cycles) in an ideal hemispherical shape (the most conservative geometry) can be placed in the tank without exceeding the 100 C wall temperature limit. Furthermore, in the case of an evenly-distributed flat layer, the tank wall reaches the temperature limit after the ground CST material reaches a height of approximately 8 inches.

Lee, S.

2010-11-01T23:59:59.000Z

29

Turkey Flat Site Effects Test Area The Turkey-Flat strong motion "blind"  

E-Print Network [OSTI]

Turkey Flat Site Effects Test Area B B' A A' C C' The Turkey-Flat strong motion "blind" prediction experiment "Blind" Test Approach · Conduct high quality field and laboratory tests to characterize Geological Survey Turkey Flat, USA Site Effects Test Area: "Blind" Test of Predicted Ground Response

Oprsal, Ivo

30

Flat Directions and Baryogenesis in Supersymmetric Theories  

E-Print Network [OSTI]

Flat directions are a generic feature of supersymmetric theories. They are of cosmological interest because they can lead to coherent production of scalars. In the early universe such flat directions could be dangerous due to the potentially large energy density and the late decay of the associated scalars when they have only $1/M_p$ couplings (Polonyi problem). On the other hand, flat directions among the standard model fields can carry baryon number and lead to a possible mechanism for baryogenesis (Affleck Dine baryogenesis). When considering the cosmological consequences of the flat directions, it is important to take into account the soft potential with curvature of order the Hubble constant due to supersymmetry breaking in the early universe. In this talk, we discuss flat directions, their potential cosmological implications focusing on Affleck-Dine baryogenesis, and how the standard picture of their evolution must be modified in the presence of the large supersymmetry breaking in the early universe.

Lisa Randall

1995-07-08T23:59:59.000Z

31

Flat panel ferroelectric electron emission display system  

DOE Patents [OSTI]

A device which can produce a bright, raster scanned or non-raster scanned image from a flat panel. Unlike many flat panel technologies, this device does not require ambient light or auxiliary illumination for viewing the image. Rather, this device relies on electrons emitted from a ferroelectric emitter impinging on a phosphor. This device takes advantage of a new electron emitter technology which emits electrons with significant kinetic energy and beam current density.

Sampayan, Stephen E. (Manteca, CA); Orvis, William J. (Livermore, CA); Caporaso, George J. (Livermore, CA); Wieskamp, Ted F. (Livermore, CA)

1996-01-01T23:59:59.000Z

32

Rocky Flats Environmental Technology Site Archived Soil & Groundwater...  

Office of Environmental Management (EM)

Rocky Flats Environmental Technology Site Archived Soil & Groundwater Master Reports Rocky Flats Environmental Technology Site Archived Soil & Groundwater Master Reports Rocky...

33

LM Records Handling System (LMRHS01) - Rocky Flats Environmental...  

Office of Environmental Management (EM)

LM Records Handling System (LMRHS01) - Rocky Flats Environmental Records Database, Office of Legacy Management LM Records Handling System (LMRHS01) - Rocky Flats Environmental...

34

How to Calculate Molecular Column Density  

E-Print Network [OSTI]

The calculation of the molecular column density from molecular spectral (rotational or ro-vibrational) transition measurements is one of the most basic quantities derived from molecular spectroscopy. Starting from first principles where we describe the basic physics behind the radiative and collisional excitation of molecules and the radiative transfer of their emission, we derive a general expression for the molecular column density. As the calculation of the molecular column density involves a knowledge of the molecular energy level degeneracies, rotational partition functions, dipole moment matrix elements, and line strengths, we include generalized derivations of these molecule-specific quantities. Given that approximations to the column density equation are often useful, we explore the optically thin, optically thick, and low-frequency limits to our derived general molecular column density relation. We also evaluate the limitations of the common assumption that the molecular excitation temperature is con...

Mangum, Jeffrey G

2015-01-01T23:59:59.000Z

35

Divided Wall Column Without the Wall  

E-Print Network [OSTI]

popularity in North America due to capital cost benefits and increasing energy conservation awareness. DWC is literally a column with a longitudinal partition inside, separating the pre-frac and the main-frac. The fixed internals, obviously, leave...

Tung, P.

2004-01-01T23:59:59.000Z

36

Analytical Modeling of a Bubble Column Dehumidifier  

E-Print Network [OSTI]

Bubble column dehumidifiers are a compact, inexpensive alternative to conventional fin-tube dehumidifiers for humidification-dehumidification (HDH) desalination, a technology that has promising applications in small-scale ...

Tow, Emily W.

37

Flat Spacetime Vacuum in Loop Quantum Gravity  

E-Print Network [OSTI]

We construct a state in the loop quantum gravity theory with zero cosmological constant, which should correspond to the flat spacetime vacuum solution. This is done by defining the loop transform coefficients of a flat connection wavefunction in the holomorphic representation which satisfies all the constraints of quantum General Relativity and it is peaked around the flat space triads. The loop transform coefficients are defined as spin foam state sum invariants of the spin networks embedded in the spatial manifold for the SU(2) quantum group. We also obtain an expression for the vacuum wavefunction in the triad represntation, by defining the corresponding spin networks functional integrals as SU(2) quantum group state sums.

A. Mikovic

2004-04-06T23:59:59.000Z

38

Performance of Reinforced Concrete Column Lap Splices  

E-Print Network [OSTI]

PERFORMANCE OF REINFORCED CONCRETE COLUMN LAP SPLICES A Thesis by RYAN ALBERSON Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER... OF SCIENCE August 2009 Major Subject: Civil Engineering PERFORMANCE OF REINFORCED CONCRETE COLUMN LAP SPLICES A Thesis by RYAN ALBERSON Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment...

Alberson, Ryan M.

2010-01-14T23:59:59.000Z

39

Chemical tracking at the Rocky Flats Plant  

SciTech Connect (OSTI)

EG&G Rocky Flats, Inc., has developed a chemical tracking system to support compliance with the Emergency Planning and community Right-to-Know Act (EPCRA) at the Rocky Flats Plant. This system, referred to as the EPCRA Chemical Control system (ECCS), uses bar code technology to uniquely identify and track the receipt, distribution, and use of chemicals. Chemical inventories are conducted using hand-held electronic scanners to update a site wide chemical database on a VAX 6000 computer. Information from the ECCS supports preparation of the EPCRA Tier II and Form R reports on chemical storage and use.

Costain, D.B.

1994-04-01T23:59:59.000Z

40

Integrated Thermal and Hydraulic Analysis of Distillation Columns  

E-Print Network [OSTI]

significant additional insights to help screen the options for distillation column revamps. Column Targeting Aspen Plus Column Targeting tool offers capabilities for thermal and hydraulic analysis of distillation columns. During design or retrofit analysis...). Aspen Plus Column Targeting Tool generates the CGCCs based on the Practical Near-Minimum Thermodynamic Condition (PNMTC) approximation (Dhole and Linnhoff). The enthalpies used in plotting the CGCCs are calculated at a given stage of the column...

Samant, K.; Sinclair, I.; Keady, G.

Note: This page contains sample records for the topic "flat column stars" 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

affinity column mediated: Topics by E-print Network  

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

a Kaibel distillation column with model predictive control (MPC). A Kaibel distillation column has several advantages compared Skogestad, Sigurd 323 Active constraint...

42

antigen-specific immunoadsorption columns: Topics by E-print...  

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

a Kaibel distillation column with model predictive control (MPC). A Kaibel distillation column has several advantages compared Skogestad, Sigurd 78 Active constraint...

43

Neal Lane: Science in a Flat World  

SciTech Connect (OSTI)

Lane discusses the changes that have taken place in the world since World War II that have made it "flatter," referring to Thomas L. Friedman's book, The World is Flat. Friedman's main premise is that inexpensive telecommunications is bringing about unhampered international competition, the demise of economic stability, and a trend toward outsourcing services, such as computer programming, engineering and science research.

Neal Lane

2006-09-12T23:59:59.000Z

44

Actin Polymerization: Forcing Flat Faces Forward  

E-Print Network [OSTI]

Actin Polymerization: Forcing Flat Faces Forward Arpita Upadhyaya1 and Alexander van Oudenaarden2 Actin polymerization has been shown to be sufficient to propel curved objects, for example beads polymerization forms the basis of numerous forms of cell motility. Actin is thought to polymerize at the leading

van Oudenaarden, Alexander

45

Neal Lane: Science in a Flat World  

ScienceCinema (OSTI)

Lane discusses the changes that have taken place in the world since World War II that have made it "flatter," referring to Thomas L. Friedman's book, The World is Flat. Friedman's main premise is that inexpensive telecommunications is bringing about unhampered international competition, the demise of economic stability, and a trend toward outsourcing services, such as computer programming, engineering and science research.

Neal Lane

2010-09-01T23:59:59.000Z

46

Flat Space Limit of (Higher-Spin) Cardy Formula  

E-Print Network [OSTI]

In this note I derive the flat space limit of the modified Cardy formula associated with inner horizons and show that it reproduces the correct Galilean conformal field theory counting of flat space cosmology microstates. l also determine the entropy of flat space cosmologies in flat space chiral gravity in this way. In addition, I derive a Cardy-like expression for flat space cosmologies with spin-3 charges and thus give a prediction for the corresponding Galilean conformal field theory counting of flat space cosmology microstates with spin-3 charges.

Max Riegler

2014-11-14T23:59:59.000Z

47

PCB fluxes from the sediment to the water column following resuspension A column experiment  

E-Print Network [OSTI]

PCB fluxes from the sediment to the water column following resuspension ­ A column experiment confirmed that many French rivers and lakes sediments are contaminated by PCBi at levels ranging from 50 of cubic meters of contaminated sediments and to improve the understanding of the behavior of PCB

Paris-Sud XI, Université de

48

The first stars: Where did they form?  

E-Print Network [OSTI]

Several emerging links between high-redshift observational cosmology and the Galactic fossil evidence found in the kinematics, metallicities and ages of Milky Way stars are discussed. In a flat Cold Dark Matter model with $\\Omega\\simeq 0.3$ that agrees with present large-scale structure observations, the oldest stars in the Milky Way should have formed in the first halos where gas was able to cool, at $z\\simeq 20$. These earliest, weakly bound dwarf galaxies probably turned only a small fraction of their gas to stars, which should be metal-poor. However, the merging rate in the early universe was much faster than the present one, so massive halos with more efficient star formation and metallicities up to the highest values present today in the bulge could have formed less than $10^9$ years after the oldest stars. The mean metallicity produced in the universe by a given redshift is related to the mean surface brightness of star-forming galaxies above this redshift, and also to the reionization epoch if galaxies were the dominant sources of ionizing radiation. The biased distribution of the early dwarf galaxies where the first stars formed should result in an age gradient with radius of the low-metallicity stars in the Milky Way, with the oldest ones concentrated in the bulge and the youngest in the outer halo.

Jordi Miralda-Escude

1999-12-15T23:59:59.000Z

49

Non-planar microfabricated gas chromatography column  

DOE Patents [OSTI]

A non-planar microfabricated gas chromatography column comprises a planar substrate having a plurality of through holes, a top lid and a bottom lid bonded to opposite surfaces of the planar substrate, and inlet and outlet ports for injection of a sample gas and elution of separated analytes. A plurality of such planar substrates can be aligned and stacked to provide a longer column length having a small footprint. Furthermore, two or more separate channels can enable multi-channel or multi-dimensional gas chromatography. The through holes preferably have a circular cross section and can be coated with a stationary phase material or packed with a porous packing material. Importantly, uniform stationary phase coatings can be obtained and band broadening can be minimized with the circular channels. A heating or cooling element can be disposed on at least one of the lids to enable temperature programming of the column.

Lewis, Patrick R. (Albuquerque, NM); Wheeler, David R. (Albuquerque, NM)

2007-09-25T23:59:59.000Z

50

Model Predictive Control of a Kaibel Distillation Column  

E-Print Network [OSTI]

column with model predictive control (MPC). A Kaibel distillation column has several advantages comparedModel Predictive Control of a Kaibel Distillation Column Martin Kvernland Ivar Halvorsen Sigurd only a single column shell. The distillation process is a multivariable process which leads

Skogestad, Sigurd

51

Mass transfer in a wetted wall column  

E-Print Network [OSTI]

and downstream calming sections. (Figure 3 ). After the liquid has transversed the length oi' the column it is disengaged from contact with the gas stream by means of a flared nossle and a collection chamber. Provision is made to measure the temperatures... internal diameter were employed. The equipment was operated so that an annular film of liquid flowed dove the column countercurrent to a stream of gas, The amount of liquid that evaporated into the gas was reassured and then used to calculate a mass...

Platt, Allison M

1950-01-01T23:59:59.000Z

52

Radiation content of Conformally flat initial data  

E-Print Network [OSTI]

We study the radiation of energy and linear momentum emitted to infinity by the headon collision of binary black holes, starting from rest at a finite initial separation, in the extreme mass ratio limit. For these configurations we identify the radiation produced by the initially conformally flat choice of the three geometry. This identification suggests that the radiated energy and momentum of headon collisions will not be dominated by the details of the initial data for evolution of holes from initial proper separations $L_0\\geq7M$. For non-headon orbits, where the amount of radiation is orders of magnitude larger, the conformally flat initial data may provide a relative even better approximation.

C. O. Lousto; R. H. Price

2004-01-11T23:59:59.000Z

53

Basic TRUEX process for Rocky Flats Plant  

SciTech Connect (OSTI)

The Generic TRUEX Model was used to develop a TRUEX process flowsheet for recovering the transuranics (Pu, Am) from a nitrate waste stream at Rocky Flats Plant. The process was designed so that it is relatively insensitive to changes in process feed concentrations and flow rates. Related issues are considered, including solvent losses, feed analysis requirements, safety, and interaction with an evaporator system for nitric acid recycle.

Leonard, R.A.; Chamberlain, D.B.; Dow, J.A.; Farley, S.E.; Nunez, L.; Regalbuto, M.C.; Vandegrift, G.F.

1994-08-01T23:59:59.000Z

54

Whiskey Flats Geothermal Area | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Office of InspectorConcentrating SolarElectric Coop,SaveWhiskey Flats Geothermal Area Jump to: navigation, search

55

Remote geologic structural analysis of Yucca Flat  

SciTech Connect (OSTI)

The Remote Geologic Analysis (RGA) system was developed by Pacific Northwest Laboratory (PNL) to identify crustal structures that may affect seismic wave propagation from nuclear tests. Using automated methods, the RGA system identifies all valleys in a digital elevation model (DEM), fits three-dimensional vectors to valley bottoms, and catalogs all potential fracture or fault planes defined by coplanar pairs of valley vectors. The system generates a cluster hierarchy of planar features having greater-than-random density that may represent areas of anomalous topography manifesting structural control of erosional drainage development. Because RGA uses computer methods to identify zones of hypothesized control of topography, ground truth using a well-characterized test site was critical in our evaluation of RGA's characterization of inaccessible test sites for seismic verification studies. Therefore, we applied RGA to a study area centered on Yucca Flat at the Nevada Test Site (NTS) and compared our results with both mapped geology and geologic structures and with seismic yield-magnitude models. This is the final report of PNL's RGA development project for peer review within the US Department of Energy Office of Arms Control (OAC) seismic-verification community. In this report, we discuss the Yucca Flat study area, the analytical basis of the RGA system and its application to Yucca Flat, the results of the analysis, and the relation of the analytical results to known topography, geology, and geologic structures. 41 refs., 39 figs., 2 tabs.

Foley, M.G.; Heasler, P.G.; Hoover, K.A. (Pacific Northwest Lab., Richland, WA (United States)); Rynes, N.J. (Northern Illinois Univ., De Kalb, IL (United States)); Thiessen, R.L.; Alfaro, J.L. (Washington State Univ., Pullman, WA (United States))

1991-12-01T23:59:59.000Z

56

Remote geologic structural analysis of Yucca Flat  

SciTech Connect (OSTI)

The Remote Geologic Analysis (RGA) system was developed by Pacific Northwest Laboratory (PNL) to identify crustal structures that may affect seismic wave propagation from nuclear tests. Using automated methods, the RGA system identifies all valleys in a digital elevation model (DEM), fits three-dimensional vectors to valley bottoms, and catalogs all potential fracture or fault planes defined by coplanar pairs of valley vectors. The system generates a cluster hierarchy of planar features having greater-than-random density that may represent areas of anomalous topography manifesting structural control of erosional drainage development. Because RGA uses computer methods to identify zones of hypothesized control of topography, ground truth using a well-characterized test site was critical in our evaluation of RGA`s characterization of inaccessible test sites for seismic verification studies. Therefore, we applied RGA to a study area centered on Yucca Flat at the Nevada Test Site (NTS) and compared our results with both mapped geology and geologic structures and with seismic yield-magnitude models. This is the final report of PNL`s RGA development project for peer review within the US Department of Energy Office of Arms Control (OAC) seismic-verification community. In this report, we discuss the Yucca Flat study area, the analytical basis of the RGA system and its application to Yucca Flat, the results of the analysis, and the relation of the analytical results to known topography, geology, and geologic structures. 41 refs., 39 figs., 2 tabs.

Foley, M.G.; Heasler, P.G.; Hoover, K.A. [Pacific Northwest Lab., Richland, WA (United States); Rynes, N.J. [Northern Illinois Univ., De Kalb, IL (United States); Thiessen, R.L.; Alfaro, J.L. [Washington State Univ., Pullman, WA (United States)

1991-12-01T23:59:59.000Z

57

Geothermal: Sponsored by OSTI -- Telephone Flat Geothermal Development...  

Office of Scientific and Technical Information (OSTI)

Telephone Flat Geothermal Development Project Environmental Impact Statement Environmental Impact Report. Final: Comments and Responses to Comments Geothermal Technologies Legacy...

58

Thermal Analysis of LANL Ion Exchange Column  

SciTech Connect (OSTI)

This document reports results from an ion exchange column heat transfer analysis requested by Los Alamos National Laboratory (LANL). The object of the analysis is to demonstrate that the decay heat from the Pu-238 will not cause resin bed temperatures to increase to a level where the resin significantly degrades.

Laurinat, J.E.

1999-06-16T23:59:59.000Z

59

Converting Nested Algebra Expressions into Flat Algebra Expressions  

E-Print Network [OSTI]

Converting Nested Algebra Expressions into Flat Algebra Expressions JAN PAREDAENS University of Antwerp and DIRK VAN GUCHT Indiana University Nested relations generalize ordinary flat relations by allowing tuple values to be either atomic or set valued. The nested algebra is a generalization of the flat

Van Gucht, Dirk

60

The Behaviour of STeel ColumnS in fire Material -Cross-seCtional CapaCity -ColuMn BuCkling  

E-Print Network [OSTI]

The Behaviour of STeel ColumnS in fire Material - Cross-seCtional CapaCity - ColuMn BuIch december 2012 #12;#12;Structural stability and the general behaviour of steel structures can be described during a fire influence the behaviour of steel structures markedly. Significant advances have been made

Giger, Christine

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


61

Introduction Flattening the Earth Continuation procedure Flat Earth Numerical simulations Continuation from a flat to a round Earth model  

E-Print Network [OSTI]

Introduction Flattening the Earth Continuation procedure Flat Earth Numerical simulations Continuation from a flat to a round Earth model in the coplanar orbit transfer problem M. Cerf1, T. Haberkorn, SADCO 2011, March 2nd M. Cerf, T. Haberkorn, E. Tr´elat Continuation from a flat to a round Earth model

Boyer, Edmond

62

Flat space (higher spin) gravity with chemical potentials  

E-Print Network [OSTI]

We introduce flat space spin-3 gravity in the presence of chemical potentials and discuss some applications to flat space cosmology solutions, their entropy, free energy and flat space orbifold singularity resolution. Our results include flat space Einstein gravity with chemical potentials as special case. We discover novel types of phase transitions between flat space cosmologies with spin-3 hair and show that the branch that continuously connects to spin-2 gravity becomes thermodynamically unstable for sufficiently large temperature or spin-3 chemical potential.

Michael Gary; Daniel Grumiller; Max Riegler; Jan Rosseel

2014-11-24T23:59:59.000Z

63

Energy Conservation in Flat FRW Cosmology  

E-Print Network [OSTI]

The consequence of energy conservation in the flat Friedmannn-Robertson-Walker (FRW) cosmology is a strictly positive accelerating expansion. A mechanism is proposed for this expansion due to the effect of the attractive (negative) gravitational potential of matter as it is being included within the expanding horizon, and the offsetting work of metric expansion, which takes place at sub-luminal speed. In our semi-classical treatment, we deal with a quintic as the equation for the scale parameter. Implications for modeling the earliest parts of the primordial expansion are discussed.

Steven Maxson

2009-01-07T23:59:59.000Z

64

Geometrical Wake of a Smooth Flat Collimator  

SciTech Connect (OSTI)

A transverse geometrical wake generated by a beam passing through a smooth flat collimator with a gradually varying gap between the upper and lower walls is considered. Based on generalization of the approach recently developed for a smooth circular taper we reduce the electromagnetic problem of the impedance calculation to the solution of two much simpler static problems - a magnetostatic and an electrostatic ones. The solution shows that in the limit of not very large frequencies, the impedance increases with the ratio h/d where h is the width and d is the distance between the collimating jaws. Numerical results are presented for the NLC Post Linac collimator.

Stupakov, G.V.; /SLAC

2011-09-09T23:59:59.000Z

65

Caithness Shepherds Flat | Department of Energy  

Office of Environmental Management (EM)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "of Energy Power Systems EngineeringDepartment of4 Federal6CleanCaithness Shepherds Flat Caithness Shepherds

66

Flat Ridge 2 | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 No revision has beenFfe2fb55-352f-473b-a2dd-50ae8b27f0a6Theoretical vs Actual DataNext 25 YearsFlat Ridge 2 Facility

67

Flat Ridge Wind Farm | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 No revision has beenFfe2fb55-352f-473b-a2dd-50ae8b27f0a6Theoretical vs Actual DataNext 25 YearsFlat Ridge 2

68

Flat Water Wind Farm | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 No revision has beenFfe2fb55-352f-473b-a2dd-50ae8b27f0a6Theoretical vs Actual DataNext 25 YearsFlat Ridge 2Wind Farm

69

Star Cluster Ecology: VII The evolution of young dense star clusters containing primordial binaries  

E-Print Network [OSTI]

We study the first 100Myr of the evolution of isolated star clusters initially containing 144179 stars, including 13107 (10%) primordial hard binaries. Our calculations include the effects of both stellar and binary evolution. Gravitational interactions among the stars are computed by direct N-body integration using high precision GRAPE-6 hardware. The evolution of the core radii and central concentrations of our simulated clusters are compared with the observed sample of young (about 100Myr) star clusters in the large Magellanic cloud. Even though our simulations start with a rich population of primordial binaries, core collapse during the early phase of the cluster evolution is not prevented. Throughout the simulations, the fraction of binaries remains roughly constant (about 10%). Due to the effects of mass segregation the mass function of intermediate-mass main-sequence stars becomes as flat as $\\alpha=-1.8$ in the central part of the cluster (where the initial Salpeter mass function had $\\alpha=-2.35$). About 6--12% of the neutron stars were retained in our simulations; the fraction of retained black holes is 40--70%. In each simulation about three neutron stars become members of close binaries with a main-sequence companion. Such a binary will eventually become an x-ray binary, when the main-sequence star starts to fill its Roche lobe. Black holes are found more frequently in binaries; in each simulated cluster we find about 11 potential x-ray binaries containing a black hole. Abstract abbreviated....

Simon Portegies Zwart; Steve McMillan; Jun Makino

2006-09-27T23:59:59.000Z

70

Star Power  

SciTech Connect (OSTI)

The U.S. Department of Energy's Princeton Plasma Physics Laboratory has released ''Star Power,'' a new informational video that uses dramatic and beautiful images and thought-provoking interviews to highlight the importance of the Laboratory's research into magnetic fusion.

None

2014-10-17T23:59:59.000Z

71

Star Power  

ScienceCinema (OSTI)

The U.S. Department of Energy's Princeton Plasma Physics Laboratory has released ''Star Power,'' a new informational video that uses dramatic and beautiful images and thought-provoking interviews to highlight the importance of the Laboratory's research into magnetic fusion.

None

2014-11-18T23:59:59.000Z

72

Risk, media, and stigma at Rocky Flats  

SciTech Connect (OSTI)

Public responses to nuclear technologies are often strongly negative. Events, such as accidents or evidence of unsafe conditions at nuclear facilities, receive extensive and dramatic coverage by the news media. These news stories affect public perceptions of nuclear risks and the geographic areas near nuclear facilities. One result of these perceptions, avoidance behavior, is a form of technological stigma that leads to losses in property values near nuclear facilities. The social amplification of risk is a conceptual framework that attempts to explain how stigma is created through media transmission of information about hazardous places and public perceptions and decisions. This paper examines stigma associated with the US Department of energy`s Rocky Flats facility, a major production plant in the nation`s nuclear weapons complex, located near Denver, Colorado. This study, based upon newspaper analyses and a survey of Denver area residents, finds that the social amplification theory provides a reasonable framework for understanding the events and public responses that took place in regard to Rocky Flats during a 6-year period, beginning with an FBI raid of the facility in 1989.

Flynn, J.; Peters, E.; Mertz, C.K.; Slovic, P. [Decision Research, Eugene, OR (United States)] [Decision Research, Eugene, OR (United States)

1998-12-01T23:59:59.000Z

73

Query execution in column-oriented database systems  

E-Print Network [OSTI]

There are two obvious ways to map a two-dimension relational database table onto a one-dimensional storage interface: store the table row-by-row, or store the table column-by-column. Historically, database system implementations ...

Abadi, Daniel J

2008-01-01T23:59:59.000Z

74

Materialization Strategies in a Column-Oriented DBMS  

E-Print Network [OSTI]

There has been renewed interest in column-oriented database architectures in recent years. For read-mostly query workloads such as those found in data warehouse and decision support applications, ``column-stores'' have ...

Abadi, Daniel J.

2006-11-27T23:59:59.000Z

75

Cross flow cyclonic flotation column for coal and minerals beneficiation  

DOE Patents [OSTI]

An apparatus and process for the separation of coal from pyritic impurities using a modified froth flotation system. The froth flotation column incorporates a helical track about the inner wall of the column in a region intermediate between the top and base of the column. A standard impeller located about the central axis of the column is used to generate a centrifugal force thereby increasing the separation efficiency of coal from the pyritic particles and hydrophillic tailings.

Lai, Ralph W. (Upper St. Clair, PA); Patton, Robert A. (Pittsburgh, PA)

2000-01-01T23:59:59.000Z

76

Quantitative analysis of SCIAMACHY carbon monoxide total column measurements  

E-Print Network [OSTI]

, SCIAMACHY CO total column retrievals are of sufficient quality to provide useful new information]. Ground-based FTIR measurements provide high quality total column measurements but have very limitedQuantitative analysis of SCIAMACHY carbon monoxide total column measurements A. T. J. de Laat,1,2 A

Laat, Jos de

77

DYNAMICS AND CONTROL OF DISTILLATION COLUMNS -A CRITICAL SURVEY  

E-Print Network [OSTI]

: 47-7-594080 Figure 1: Typical simple distillation column. zF, yD and xB are mole fractions. tureDYNAMICS AND CONTROL OF DISTILLATION COLUMNS - A CRITICAL SURVEY Sigurd Skogestad Chemical cation and Control, 18, 177-217, 1997. Abstract Distillation column dynamics and control has been viewed

Skogestad, Sigurd

78

DYNAMICS AND CONTROL OF DISTILLATION COLUMNS A CRITICAL SURVEY  

E-Print Network [OSTI]

distillation column. z F , yD and xB are mole fractions. ture review, but a few new ideas are also presentedDYNAMICS AND CONTROL OF DISTILLATION COLUMNS ­ A CRITICAL SURVEY Sigurd Skogestad \\Lambda Chemical, Identification and Control, 18, 177­217, 1997. Abstract Distillation column dynamics and control has been viewed

Skogestad, Sigurd

79

Adsorption of branched and dendritic polymers onto flat surfaces: A Monte Carlo study  

SciTech Connect (OSTI)

Using Monte Carlo simulations based on the bond fluctuation model we study the adsorption of starburst dendrimers with flexible spacers onto a flat surface. The calculations are performed for various generation number G and spacer length S in a wide range of the reduced temperature ? as the measure of the interaction strength between the monomers and the surface. Our simulations indicate a two-step adsorption scenario. Below the critical point of adsorption, ?{sub c}, a weakly adsorbed state of the dendrimer is found. Here, the dendrimer retains its shape but sticks to the surface by adsorbed spacers. By lowering the temperature below a spacer-length dependent value, ?*(S) < ?{sub c}, a step-like transition into a strongly adsorbed state takes place. In the flatly adsorbed state the shape of the dendrimer is well described by a mean field model of a dendrimer in two dimensions. We also performed simulations of star-polymers which display a simple crossover-behavior in full analogy to linear chains. By analyzing the order parameter of the adsorption transition, we determine the critical point of adsorption of the dendrimers which is located close to the critical point of adsorption for star-polymers. While the order parameter for the adsorbed spacers displays a critical crossover scaling, the overall order parameter, which combines both critical and discontinuous transition effects, does not display simple scaling. The step-like transition from the weak into the strong adsorbed regime is confirmed by analyzing the shape-anisotropy of the dendrimers. We present a mean-field model based on the concept of spacer adsorption which predicts a discontinuous transition of dendrimers due to an excluded volume barrier. The latter results from an increased density of the dendrimer in the flatly adsorbed state which has to be overcome before this state is thermodynamically stable.

Sommer, J.-U. [Leibniz Institute of Polymer Research Dresden e. V., 01069 Dresden (Germany) [Leibniz Institute of Polymer Research Dresden e. V., 01069 Dresden (Germany); Institute for Theoretical Physics, Technische Universität Dresden, 01069 Dresden (Germany); K?os, J. S. [Leibniz Institute of Polymer Research Dresden e. V., 01069 Dresden (Germany) [Leibniz Institute of Polymer Research Dresden e. V., 01069 Dresden (Germany); Faculty of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Pozna? (Poland); Mironova, O. N. [Leibniz Institute of Polymer Research Dresden e. V., 01069 Dresden (Germany)] [Leibniz Institute of Polymer Research Dresden e. V., 01069 Dresden (Germany)

2013-12-28T23:59:59.000Z

80

Energy Star  

E-Print Network [OSTI]

is a joint program of: ? U.S. Environmental Protection Agency (EPA) ? U.S. Department of Energy (DOE) ? Mission: ? ?Help us all save money and protect the environment through energy efficient products and practices.? ? History: ? 1992 ? Energy... Star Label introduced for energy-efficient products ? Expanded to include technical information & tools ? Website: www.energystar.gov ESL-KT-12-10-08 CATEE 2012: Clean Air Through Energy Efficiency Conference, Galveston, TX, October 9-11, 2012...

Reihl, K.; Tullos, A.

2012-01-01T23:59:59.000Z

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


81

Testing and analysis of structural steel columns subjected to blast loads  

E-Print Network [OSTI]

Blast Simulator Testing of Steel Columns and Components. ”Testing of Structural Steel Columns. ” 8 th Internationaland Analysis of Structural Steel Columns Subjected to Blast

Stewart, Lauren K.

2010-01-01T23:59:59.000Z

82

ARM - Field Campaign - Single Column Model IOP  

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

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

83

Sandia National Laboratories: Floating Oscillating Water Column  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 -theErik Spoerke SSLS Exhibit at Explora MuseumFloating Oscillating Water Column

84

EIS-0276: Rocky Flats Plutonium Storage, Golden, Colorado  

Broader source: Energy.gov [DOE]

This EIS analyzes DOE's proposed action to provide safe interim storage of approximately 10 metric tons of plutonium at the Rocky Flats Environmental Technology Site (RFETS).

85

2006 Annual Ecology Report for the Rocky Flats Site  

Office of Legacy Management (LM)

Ecology Report for the Rocky Flats Site Click on the links below to access different portions of the electronic annual report. 2006 Annual Report Sections Diffuse Knapweed...

86

Preliminary Notice of Violation , Rocky Flats Environmental Technology...  

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

deficiencies associated two events in March and April 1996 that resulted in the spread of contamination and personnel uptakes of radioactive material at the Rocky Flats...

87

Synthesis of focusing-and-deflection columns  

SciTech Connect (OSTI)

Szilagyi and Szep have demonstrated that focusing lenses of high performances can be constructed from a column of circular plate electrodes. Later, Szilagyi modified that system to include dipole, quadrupole, and octupole components by partitioning each plate into eight equal sectors. It has already been shown that the additional quadrupole components can indeed bring about substantial improvements in the focusing of charged particle beams. In this article, that design procedure is expanded to construct columns capable of both focusing and deflecting particle beams by just introducing additional dipole components. In this new design, the geometry of the system remains unchanged. The only extra complication is the demand for more individual controls of the sector voltages. Two sample designs, one for negative ions and one for electrons, are presented showing that in both cases a {plus_minus}2.3 mrad diverging beam can be focused down to a spot of less than 50 nm in radius over a scanning circular area of radius 0.25 mm. The details of the two systems are given in Sec. IV along with the source conditions. The performance of the negative ion system is found to be comparable to the published data. For the relativistic electron system, the interaction of individual components to reduce various aberrations is investigated. {copyright} {ital 1995} {ital American} {ital Vacuum} {ital Society}

Szilagyi, M.; Mui, P.H. [Department of Electrical and Computer Engineering, University of Arizona, Tucson, Arizona 85721 (United States)] [Department of Electrical and Computer Engineering, University of Arizona, Tucson, Arizona 85721 (United States)

1995-03-01T23:59:59.000Z

88

Improved focusing-and-deflection columns  

SciTech Connect (OSTI)

Our earlier design procedures for constructing quadrupole columns are further expanded to include octupole corrector units and ``octupole`` deflectors with no third-order harmonics. The additional complications are finer partitioning of the plates and increased number of voltage controllers. Two sample designs, one having only the additional octupole deflectors and one having both the deflectors and the correctors, are presented and compared to our previous quadrupole system. The additional octupole components are shown to be capable of increasing the current density from 30% to more than 300% for a four-plate system, designed to focus and scan the electron beam over a circular area of 0.25 mm radius. The electron beam is assumed to have an initial divergence of {plus_minus}2.3 mrad, an initial energy of 6 kV, a total energy spread of 1 eV, and a final acceleration of 30 keV. These systems are then slightly reoptimized for a superficial comparison with the commercially available column by Micrion Corporation. The numerical results indicate a potential for substantial improvements, demonstrating the power of this design procedure. Finally, a discussion is presented on how the individual components can interact with each other to reduce the various aberrations. {copyright} {ital 1995} {ital American} {ital Vacuum} {ital Society}

Mui, P.H.; Szilagyi, M. [Department of Electrical and Computer Engineering, University of Arizona, Tucson, Arizona 85721 (United States)] [Department of Electrical and Computer Engineering, University of Arizona, Tucson, Arizona 85721 (United States)

1995-07-01T23:59:59.000Z

89

Comparison between a spray column and a sieve tray column operating as liquid-liquid heat exchangers  

SciTech Connect (OSTI)

The performance of a spray column and a sieve tray column was compared as a liquid-liquid heat exchanger. In carrying out these studies a 15.2 cm (6.0 in.) diameter column, 183 cm (6.0 ft) tall was utilized. The performance of the spray column as a heat exchanger was shown to correlate with the model of Letan-Kehat which has as a basis that the heat transfer is dominated by the wakeshedding characteristics of the drops over much of the column length. This model defines several hydrodynamic zones along the column of which the wake formation zone at the bottom appears to have the most efficient heat transfer. The column was also operated with four perforated plates spaced two column diameters apart in order to take advantage of the wake formation zone heat transfer. The plates induce coalescence of the dispersed phase and reformation of the drops, and thus cause a repetition of the wake formation zone. It is shown that the overall volumetric heat transfer coefficient in a perforated plate column is increased by a minimum of eleven percent over that in a spray column. A hydrodynamic model that predicts the performance of a perforated plate column is suggested.

Keller, A.; Jacobs, H.R.; Boehm, R.F.

1980-12-01T23:59:59.000Z

90

INVENTORY FOR ELGAR COURT FLAT NO. BLOCK NO. ROOM NO.  

E-Print Network [OSTI]

INVENTORY FOR ELGAR COURT FLAT NO. BLOCK NO. ROOM NO. Staff on the Vale Village try to ensure and cleaned to a high standard. Please make sure that you complete this inventory and note down anything which seat x 1 Toilet roll holder x 1 INVENTORY FOR SHACKLETON FLAT NO: BLOCK NO: ROOM NO: NAME: TELEPHONE

Birmingham, University of

91

INVENTORY FOR ELGAR COURT FLAT NO. BLOCK NO. ROOM NO.  

E-Print Network [OSTI]

INVENTORY FOR ELGAR COURT FLAT NO. BLOCK NO. ROOM NO. Staff on the Vale Village try to ensure and cleaned to a high standard. Please make sure that you complete this inventory and note down anything which Toilet seat x 1 Toilet roll holder x 1 INVENTORY FOR MASON FLAT NO: BLOCK NO: ROOM NO: NAME: TELEPHONE

Birmingham, University of

92

INVENTORY FOR ELGAR COURT FLAT NO. BLOCK NO. ROOM NO.  

E-Print Network [OSTI]

INVENTORY FOR ELGAR COURT FLAT NO. BLOCK NO. ROOM NO. Staff on the Vale Village try to ensure and cleaned to a high standard. Please make sure that you complete this inventory and note down anything which holder x 1 INVENTORY FOR TENNIS COURT BLOCK NO: FLAT NO: ROOM NO: NAME: TELEPHONE EXT. NO: #12;How

Birmingham, University of

93

INVENTORY FOR ELGAR COURT FLAT NO. BLOCK NO. ROOM NO.  

E-Print Network [OSTI]

INVENTORY FOR ELGAR COURT FLAT NO. BLOCK NO. ROOM NO. Staff on the Vale Village try to ensure and cleaned to a high standard. Please make sure that you complete this inventory and note down anything which Toilet seat x 1 Toilet roll holder x 1 INVENTORY FOR ELGAR COURT FLAT NO: BLOCK NO: ROOM NO: NAME

Birmingham, University of

94

INVENTORY FOR ELGAR COURT FLAT NO. BLOCK NO. ROOM NO.  

E-Print Network [OSTI]

INVENTORY FOR ELGAR COURT FLAT NO. BLOCK NO. ROOM NO. Staff on the Vale Village try to ensure and cleaned to a high standard. Please make sure that you complete this inventory and note down anything which rail x 1 INVENTORY FOR MAPLE BANK FLAT NO: BLOCK NO: ROOM NO: NAME: TELEPHONE EXT. NO: #12;How

Birmingham, University of

95

Commercial Decommissioning at DOE's Rocky Flats  

SciTech Connect (OSTI)

Due in large part to the number of nuclear facilities that make up the DOE complex, DOE-EM work has historically been paperwork intensive and driven by extensive regulations. Requirements for non-nuclear facilities are often grouped with those of nuclear facilities, driving up costs. Kaiser-Hill was interested in applying a commercial model to demolition of these facilities and wanted to apply necessary and sufficient standards to the work activities, but avoid applying unnecessary requirements. Faced with demolishing hundreds of uncontaminated or non-radiologically contaminated facilities, Kaiser-Hill has developed a subcontracting strategy to drastically reduce the cost of demolishing these facilities at Rocky Flats. Aiming to tailor the demolition approach of such facilities to more closely follow commercial practices, Kaiser-Hill recently released a Request for Proposals (RFP) for the demolition of the site's former central administration facility. The RFP significantly reduced requirements for compliance with specific DOE directives. Instead, the RFP required subcontractors to comply with health and safety requirements commonly found in the demolition of similar facilities in a commercial setting. This resulted in a number of bids from companies who have normally not bid on DOE work previously and at a reduced cost over previous approaches. This paper will discuss the details of this subcontracting strategy.

Freiboth, C.; Sandlin, N.; Schubert, A.; Hansen, S.

2002-02-25T23:59:59.000Z

96

The Critical Mass Laboratory at Rocky Flats  

SciTech Connect (OSTI)

The Critical Mass Laboratory (CML) at Rocky Flats northwest of Denver, Colorado, was built in 1964 and commissioned to conduct nuclear experiments on January 28, 1965. It was built to attain more accurate and precise experimental data to ensure nuclear criticality safety at the plant than were previously possible. Prior to its construction, safety data were obtained from long extrapolations of subcritical data (called in situ experiments), calculated parameters from reactor engineering 'models', and a few other imprecise methods. About 1700 critical and critical-approach experiments involving several chemical forms of enriched uranium and plutonium were performed between then and 1988. These experiments included single units and arrays of fissile materials, reflected and 'bare' systems, and configurations with various degrees of moderation, as well as some containing strong neutron absorbers. In 1989, a raid by the Federal Bureau of Investigation (FBI) caused the plant as a whole to focus on 'resumption' instead of further criticality safety experiments. Though either not recognized or not admitted for a few years, that FBI raid did sound the death knell for the CML. The plant's optimistic goal of resumption evolved to one of deactivation, decommissioning, and plantwide demolition during the 1990s. The once-proud CML facility was finally demolished in April of 2002.

Rothe, Robert E

2003-10-15T23:59:59.000Z

97

Spectral Modeling Hot Star Winds  

E-Print Network [OSTI]

supernovaeProduce supernovae (neutron stars, black holes)(neutron stars, black holes) ·· Found near birth

Cohen, David

98

IMPROVED PRUNING IN COLUMN GENERATION OF A VEHICLE ROUTING PROBLEM  

E-Print Network [OSTI]

column generation, shadow price model 1. Introduction The German automobile club ADAC (Allgemeiner Deutscher Automobil- Club) maintains a heterogeneous fleet of service vehicles in order to assist people

Krumke, Sven O.

99

Improved Column Generation for Highly Degenerate Master Problems  

E-Print Network [OSTI]

Dec 1, 2011 ... Abstract: Column generation for solving linear programs with a huge number of variables alternates between solving a master problem and a ...

Jacques Desrosiers

2011-12-01T23:59:59.000Z

100

New developments in the primal-dual column generation technique  

E-Print Network [OSTI]

Jan 25, 2011 ... Abstract: The classical column generation is based on optimal solutions of the restricted master problems. This strategy frequently results in an ...

Jacek Gondzio

2011-01-25T23:59:59.000Z

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


101

accretion column structure: Topics by E-print Network  

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

of Alternative Control Structures for an Ideal Two-Product Reactive Distillation Column Engineering Websites Summary: Comparison of Alternative Control Structures for an...

102

Design of Earthquake Resistant Bridges Using Rocking Columns  

E-Print Network [OSTI]

Self-Compacting Concrete being2.2.2 Self-Compacting Concrete . . . . . 2.3 Bridge ColumnsBRIDGE CONSTRUCTION Self-Compacting Concrete The mechanical

Barthes, Clement Benjamin

2012-01-01T23:59:59.000Z

103

A quantum kinematics for asymptotically flat spacetimes  

E-Print Network [OSTI]

We construct a quantum kinematics for asymptotically flat spacetimes based on the Koslowski-Sahlmann (KS) representation. The KS representation is a generalization of the representation underlying Loop Quantum Gravity (LQG) which supports, in addition to the usual LQG operators, the action of `background exponential operators' which are connection dependent operators labelled by `background' $su(2)$ electric fields. KS states have, in addition to the LQG state label corresponding to 1 dimensional excitations of the triad, a label corresponding to a `background' electric field which describes 3 dimensional excitations of the triad. Asymptotic behaviour in quantum theory is controlled through asymptotic conditions on the background electric fields which label the {\\em states} and the background electric fields which label the {\\em operators}. Asymptotic conditions on the triad are imposed as conditions on the background electric field state label while confining the LQG spin net graph labels to compact sets. We show that KS states can be realised as wave functions on a quantum configuration space of generalized connections and that the asymptotic behaviour of each such generalized connection is determined by that of the background electric fields which label the background exponential operators. Similar to the spatially compact case, the Gauss Law and diffeomorphism constraints are then imposed through Group Averaging techniques to obtain a large sector of gauge invariant states. It is shown that this sector supports a unitary action of the group of asymptotic rotations and translations and that, as anticipated by Friedman and Sorkin, for appropriate spatial topology, this sector contains states which display fermionic behaviour under $2\\pi$ rotations.

Miguel Campiglia; Madhavan Varadarajan

2014-12-17T23:59:59.000Z

104

AN INFRARED CENSUS OF STAR FORMATION IN THE HORSEHEAD NEBULA  

SciTech Connect (OSTI)

At {approx} 400 pc, the Horsehead Nebula (B33) is the closest radiatively sculpted pillar to the Sun, but the state and extent of star formation in this structure is not well understood. We present deep near-infrared (IRSF/SIRIUS JHK {sub S}) and mid-infrared (Spitzer/IRAC) observations of the Horsehead Nebula to characterize the star-forming properties of this region and to assess the likelihood of triggered star formation. Infrared color-color and color-magnitude diagrams are used to identify young stars based on infrared excess emission and positions to the right of the zero-age main sequence, respectively. Of the 45 sources detected at both near- and mid-infrared wavelengths, three bona fide and five candidate young stars are identified in this 7' x 7' region. Two bona fide young stars have flat infrared spectral energy distributions and are located at the western irradiated tip of the pillar. The spatial coincidence of the protostars at the leading edge of this elephant trunk is consistent with the radiation-driven implosion model of triggered star formation. There is no evidence, however, for sequential star formation within the immediate {approx} 1.'5 (0.17 pc) region from the cloud/H II region interface.

Bowler, Brendan P. [Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822 (United States); Waller, William H. [Department of Physics and Astronomy, Tufts University, Medford, MA 02155 (United States); Megeath, S. Thomas [Department of Physics and Astronomy, University of Toledo, Toledo, OH 43606 (United States); Patten, Brian M. [National Science Foundation, 4201 Wilson Blvd. Arlington, VA 22230 (United States); Tamura, Motohide [National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo 181-8588 (Japan)], E-mail: bpbowler@ifa.hawaii.edu, E-mail: william.waller@tufts.edu, E-mail: megeath@physics.utoledo.edu, E-mail: bpatten@nsf.gov, E-mail: motohide.tamura@nao.ac.jp

2009-03-15T23:59:59.000Z

105

Left invertibility, flatness and identifiability of switched linear dynamical systems: a framework  

E-Print Network [OSTI]

Left invertibility, flatness and identifiability of switched linear dynamical systems: a framework invertibility and flatness, dynamical systems are structurally equivalent to some specific cryptographic invertibility, flatness and identifiability of discrete- time switched linear systems are investigated

Paris-Sud XI, Université de

106

2005 ASHRAE. 109 Groundwater heat pump systems using standing column  

E-Print Network [OSTI]

©2005 ASHRAE. 109 ABSTRACT Groundwater heat pump systems using standing column wells as their ground heat exchanger can be used as a highly efficient source of heating and cooling in residential the well through the heat pump in an open-loop pipe circuit. Standing column wells have been in use

107

atomically flat gold: Topics by E-print Network  

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

Flat(Tire1) Intact(Tire1) StartFinish Inflate(Tire1 Starner, Thad E. 147 Local and global instabilities in nanosize rectangular prismatic gold specimens R.C. Batra *, A.A....

108

Seismic rehabilitation of a reinforced concrete flat-slab structure  

E-Print Network [OSTI]

The effectiveness of seismic rehabilitation techniques used to eliminate punching shear failures was assessed for flat-slab structural systems. This type of retrofit was evaluated for a four-story reinforced concrete (RC) frame office building...

Jimenez, Laila Margarita

1999-01-01T23:59:59.000Z

109

Modified Ricci flow and asymptotically non-flat spaces  

E-Print Network [OSTI]

The present work extends the application of a modified Ricci flow equation to an asymptotically non flat space, namely Marder's cylindrially symmetric space. It is found that the flow equation has a solution at least in a particular case.

Shubhayu Chatterjee; Narayan Banerjee

2013-04-08T23:59:59.000Z

110

Interacting holographic dark energy model in non-flat universe  

E-Print Network [OSTI]

We employ the holographic model of interacting dark energy to obtain the equation of state for the holographic energy density in non-flat (closed) universe enclosed by the event horizon measured from the sphere of horizon named $L$.

M R Setare

2006-10-14T23:59:59.000Z

111

DOE's Former Rocky Flats Weapons Production Site to Become National...  

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

Flats nuclear weapons production site to the Department of the Interior's (DOI) U.S. Fish and Wildlife Service (FWS) for use as a National Wildlife Refuge. After more than a...

112

The Redshift Distribution of Flat-Spectrum Radio Sources  

E-Print Network [OSTI]

The redshift distribution of flat-spectrum radio sources with 5 GHz flux densities S>5 mJy is a key component in using current radio lens surveys to probe the cosmological model. We have constructed the first flat-spectrum radio sample in the flux density range 3-20 mJy. Our new sample has 33 sources; we have determined the redshifts of 14 of these (42% complete). The low mean redshift, ~0.75, of our faintest sample needs to be confirmed by further observations to improve the sample completeness. We also increased the redshift completeness of several surveys of brighter flat-spectrum sources. While the mean redshift, ~1.1 of flat-spectrum samples fainter than 1 Jy is nearly constant, the fraction of the sources identifiable as quasars steadily drops from ~80% to ~10% as the flux density of the sources decreases.

J. A. Munoz; E. E. Falco; C. S. Kochanek; J. Lehar; E. Mediavilla

2003-05-20T23:59:59.000Z

113

THERMAL MODELING OF ION EXCHANGE COLUMNS WITH SPHERICAL RF RESIN  

SciTech Connect (OSTI)

Models have been developed to simulate the thermal performance of RF columns fully loaded with radioactive cesium. Temperature distributions and maximum temperatures across the column were calculated during Small Column Ion Exchange (SCIX) process upset conditions with a focus on implementation at Hanford. A two-dimensional computational modeling approach was taken to include conservative, bounding estimates for key parameters such that the results will provide the maximum centerline temperatures achievable under the design configurations using a feed composition known to promote high cesium loading on RF. The current full-scale design for the SCIX system includes a central cooling tube, and one objective of these calculations was to examine its elimination to simplify the design. Results confirmed that a column design without a central cooling tube is feasible for RF, allowing for the possibility of significant design simplifications if it can be assumed that the columns are always filled with liquid. With active cooling through the four outer tubes, the maximum column diameter expected to maintain the temperature below the assumed media and safety limits is 26 inches, which is comparable to the current design diameter. Additional analysis was conducted to predict the maximum column temperatures for the previously unevaluated accident scenario involving inadvertent drainage of liquid from a cesium-saturated column, with retention of the ion exchange media and cesium in the column. As expected, much higher maximum temperatures are observed in this case due to the poor heat transfer properties of air versus liquid. For this hypothetical accident scenario involving inadvertent and complete drainage of liquid from a cesium-saturated column, the modeling results indicate that the maximum temperature within a 28 inch diameter RF column with external cooling is expected to exceed 250 C within 2 days, while the maximum temperature of a 12 inch column is maintained below 100 C. In addition, the calculation results demonstrate that the cooling tube system external to an air-filled column is not highly effective at reducing the maximum temperature, but the baseline design using a central cooling tube inside the column provides sufficient cooling to maintain the maximum temperature near the assumed safety limit.

Lee, S.; King, W.

2009-12-30T23:59:59.000Z

114

HEAT TRANSFER ANALYSIS FOR ION-EXCHANGE COLUMN SYSTEM  

SciTech Connect (OSTI)

Models have been developed to simulate the thermal characteristics of Crystalline Silicotitanate (CST) ion exchange media fully loaded with radioactive cesium in a column configuration and distributed within a waste storage tank. This work was conducted to support the Small Column Ion Exchange (SCIX) program which is focused on processing dissolved, high-sodium salt waste for the removal of specific radionuclides (including Cs-137, Sr-90, and actinides) within a High Level Waste (HLW) storage tank at the Savannah River Site. The SCIX design includes CST columns inserted and supported in the tank top risers for cesium removal. Temperature distributions and maximum temperatures across the column were calculated with a focus on process upset conditions. A two-dimensional computational modeling approach for the in-column ion-exchange domain was taken to include conservative, bounding estimates for key parameters such that the results would provide the maximum centerline temperatures achievable under the design configurations using a feed composition known to promote high cesium loading on CST. The current full-scale design for the CST column includes one central cooling pipe and four outer cooling tubes. Most calculations assumed that the fluid within the column was stagnant (i.e. no buoyancy-induced flow) for a conservative estimate. A primary objective of these calculations was to estimate temperature distributions across packed CST beds immersed in waste supernate or filled with dry air under various accident scenarios. Accident scenarios evaluated included loss of salt solution flow through the bed, inadvertent column drainage, and loss of active cooling in the column. The modeling results demonstrate that the baseline design using one central and four outer cooling tubes provides a highly efficient cooling mechanism for reducing the maximum column temperature.

Lee, S.; King, W.

2011-05-23T23:59:59.000Z

115

A two component jet model for the X-ray afterglow flat segment in short GRB 051221A  

E-Print Network [OSTI]

In the double neutron star merger or neutron star-black hole merger model for short GRBs, the outflow launched might be mildly magnetized and neutron rich. The magnetized neutron-rich outflow will be accelerated by the magnetic and thermal pressure and may form a two component jet finally, as suggested by Vlahakis, Peng & K\\"{o}nigl (2003). We show in this work that such a two component jet model could well reproduce the multi-wavelength afterglow lightcurves, in particular the X-ray flat segment, of short GRB 051221A. In this model, the central engine need not to be active much longer than the prompt $\\gamma-$ray emission.

Zhi-Ping Jin; Ting Yan; Yi-Zhong Fan; Da-Ming Wei

2007-01-20T23:59:59.000Z

116

Calculation of CO2 column heights in depleted gas fields from known pre-production gas column heights  

E-Print Network [OSTI]

Calculation of CO2 column heights in depleted gas fields from known pre-production gas column that the CO2 is in a dense phase (either liquid or supercritical). Accurate assessment of the storage capacity also requires an estimation of the amount of CO2 that can be safely stored beneath the reservoir seal

117

Column-by-column compositional mapping by Z-contrast imaging  

SciTech Connect (OSTI)

A phenomenological method is developed to determine the composition of materials, with atomic column resolution, by analysis of integrated intensities of aberration-corrected Z-contrast scanning transmission electron microscopy images. The method is exemplified for InAsxP1-x alloys using epitaxial thin films with calibrated compositions as standards. Using this approach we have determined the composition of the two-dimensional wetting layer formed between self-assembled InAs quantum wires on InP (001) substrates. The method utilizes a series of B coefficients that models the background signal in Z-contrast images, which is unaccounted for by image simulations.

Molina Rubio, Sergio I [ORNL; Varela del Arco, Maria [ORNL; Sales Lerida, David [ORNL; Galindo, Pedro [Universidad de Cadiz, Spain; Fuster, David [Instituto de Microelectronica de Madrid (CNM, CSIC); Gonzalez, Yolanda [Instituto de Microelectronica de Madrid (CNM, CSIC); Alen, B. [Instituto de Microelectronica de Madrid (CNM, CSIC); Gonzalez, Luisa [Instituto de Microelectronica de Madrid (CNM, CSIC); Pennycook, Stephen J [ORNL

2009-01-01T23:59:59.000Z

118

Active vapor split control for dividing-wall columns Journal: Industrial & Engineering Chemistry Research  

E-Print Network [OSTI]

@ntnu.no Abstract Dividing-wall distillation columns offer large potential energy savings over conventional column column Introduction Dividing-wall distillation columns such as Petlyuk arrangements and the Kaibel column vapor fraction Purities (mol %): 97.6 % (D), 97.3 % (S); 99.6 % (B) Stages: 40 in prefractionator and 80

Skogestad, Sigurd

119

MODELING AND SIMULATION OF SOLID FLUIDIZATION IN A RESIN COLUMN  

SciTech Connect (OSTI)

The objective of the present work is to model the resin particles within the column during fluidization and sedimentation processes using computation fluid dynamics (CFD) approach. The calculated results will help interpret experimental results, and they will assist in providing guidance on specific details of testing design and establishing a basic understanding of particle’s hydraulic characteristics within the column. The model is benchmarked against the literature data and the test data (2003) conducted at Savannah River Site (SRS). The paper presents the benchmarking results and the modeling predictions of the SRS resin column using the improved literature correlations applicable for liquid-solid granular flow.

Lee, S.

2014-06-24T23:59:59.000Z

120

SENSITIVITY ANALYSIS FOR SALTSTONE DISPOSAL UNIT COLUMN DEGRADATION ANALYSES  

SciTech Connect (OSTI)

PORFLOW related analyses supporting a Sensitivity Analysis for Saltstone Disposal Unit (SDU) column degradation were performed. Previous analyses, Flach and Taylor 2014, used a model in which the SDU columns degraded in a piecewise manner from the top and bottom simultaneously. The current analyses employs a model in which all pieces of the column degrade at the same time. Information was extracted from the analyses which may be useful in determining the distribution of Tc-99 in the various SDUs throughout time and in determining flow balances for the SDUs.

Flach, G.

2014-10-28T23:59:59.000Z

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


121

From Neutron Stars to Strange Stars  

E-Print Network [OSTI]

This paper discusses several most intruigung astrophysical implications connected with the possible absolute stability of strange quark matter.This is followed by a discussion of two astrophysical signals that may point at the existence of quark matter in both isolated neutron stars as well as in neutron stars in low-mass x-ray binaries (LMXBs).

Fridolin Weber

2001-12-04T23:59:59.000Z

122

New developments in the primal-dual column generation technique  

E-Print Network [OSTI]

Jan 24, 2011 ... problem (CSP), the vehicle routing problem with time windows (VRPTW), and the .... Actually, any column with a negative reduced cost can be added to the RMP. ...... OBOE: the Oracle Based Optimization Engine, 2010.

2011-01-24T23:59:59.000Z

123

ENGINEERING DEVELOPMENT OF SLURRY BUBBLE COLUMN REACTOR (SBCR) TECHNOLOGY  

SciTech Connect (OSTI)

The major technical objectives of this program are threefold: (1) to develop the design tools and a fundamental understanding of the fluid dynamics of a slurry bubble column reactor to maximize reactor productivity, (2) to develop the mathematical reactor design models and gain an understanding of the hydrodynamic fundamentals under industrially relevant process conditions, and (3) to develop an understanding of the hydrodynamics and their interaction with the chemistries occurring in the bubble column reactor. Successful completion of these objectives will permit more efficient usage of the reactor column and tighter design criteria, increase overall reactor efficiency, and ensure a design that leads to stable reactor behavior when scaling up to large diameter reactors. The past three months of research have been focused on two major areas of bubble column hydrodynamics: (1) pressure and temperature effects on gas holdup and (2) region transition using a sparger as a gas distributor.

Bernard A. Toseland, Ph.D.

1999-03-01T23:59:59.000Z

124

Practical Application of Distillation Column Energy Control Systems  

E-Print Network [OSTI]

Closed loop computer control of an ethylene column has been shown to save $350/day in improved ethylene recovery and $150/day in reduced energy consumption. These savings are achieved through material balance optimization and energy balance...

Matthews, S. A.

1980-01-01T23:59:59.000Z

125

High speed electrical power takeoff for oscillating water columns   

E-Print Network [OSTI]

This thesis describes research into electrical power takeoff mechanisms for Oscillating Water Column (OWC) wave energy devices. The OWC application is studied and possible alternatives to the existing Induction Generator ...

Hodgins, Neil

2010-01-01T23:59:59.000Z

126

Transformations of mercury in the marine water column  

E-Print Network [OSTI]

Methylation of mercury (Hg) in the marine water column has been hypothesized to serve as the primary source of the bioaccumulating chemical species monomethylmercury (MMHg) to marine food webs. Despite decades of research ...

Munson, Kathleen M. (Kathleen May)

2014-01-01T23:59:59.000Z

127

Optimization Online - Simultaneous Column-and-Row Generation ...  

E-Print Network [OSTI]

Nov 14, 2010 ... Abstract: In this paper, we develop a simultaneous column-and-row generation algorithm that could be applied to a general class of large-scale ...

Ibrahim Muter

2010-11-14T23:59:59.000Z

128

Relativistic electromagnetic flat top solitons and their stability  

SciTech Connect (OSTI)

The inclusion of ion response in the study of relativistically intense electromagnetic laser pulse propagation in plasma yields certain distinct varieties of single peak solitonic structures. A flat top slow moving structure (for which the various fields have a flat profile over a wide spatial range) is one such solution. A detailed characterization of these solutions along with the eigen spectrum of their formation in the parameter space has been presented. The evolution of this particular solution is studied in detail with the help of a coupled fluid Maxwell set of equations. The study shows that the flat top solution is unstable. The instability is characterized as the backward Brillouin instability for which the electron quiver velocity plays the role of the effective temperature.

Sundar, Sita; Das, Amita; Saxena, Vikrant; Kaw, Predhiman; Sen, Abhijit [Institute for Plasma Research, Bhat, Gandhinagar-382428 (India)

2011-11-15T23:59:59.000Z

129

Revised Thermal Analysis of LANL Ion Exchange Column  

SciTech Connect (OSTI)

This document updates a previous calculation of the temperature distributions in a Los Alamos National Laboratory (LANL) ion exchange column.1 LANL operates two laboratory-scale anion exchange columns, in series, to extract Pu-238 from nitric acid solutions. The Defense Nuclear Facilities Safety Board has requested an updated analysis to calculate maximum temperatures for higher resin loading capacities obtained with a new formulation of the Reillex HPQ anion exchange resin. The increased resin loading capacity will not exceed 118 g plutonium per L of resin bed. Calculations were requested for normal operation of the resin bed at the minimum allowable solution feed rate of 30 mL/min and after an interruption of flow at the end of the feed stage, when one of the columns is fully loaded. The object of the analysis is to demonstrate that the decay heat from the Pu-238 will not cause resin bed temperatures to increase to a level where the resin significantly degrades. At low temperatures, resin bed temperatures increase primarily due to decay heat. At {approx}70 C a Low Temperature Exotherm (LTE) resulting from the reaction between 8-12 M HNO{sub 3} and the resin has been observed. The LTE has been attributed to an irreversible oxidation of pendant ethyl benzene groups at the termini of the resin polymer chains by nitric acid. The ethyl benzene groups are converted to benzoic acid moities. The resin can be treated to permanently remove the LTE by heating a resin suspension in 8M HNO{sub 3} for 30-45 minutes. No degradation of the resin performance is observed after the LTE removal treatment. In fact, heating the resin in boiling ({approx}115-120 C) 12 M HNO{sub 3} for 3 hr displays thermal stability analogous to resin that has been treated to remove the LTE. The analysis is based on a previous study of the SRS Frames Waste Recovery (FWR) column, performed in support of the Pu-238 production campaign for NASA's Cassini mission. In that study, temperature transients following an interruption of flow to the column were calculated. The transient calculations were terminated after the maximum resin bed temperature reached the Technical Standard of 60 C, which was set to prevent significant resin degradation. The LANL column differs from the FWR column in that it has a significantly smaller radius, 3.73 cm nominal versus approximately 28 cm. It follows that natural convection removes heat much more effectively from the LANL column, so that the column may reach thermal equilibrium. Consequently, the calculations for a flow interruption were extended until an approach to thermal equilibrium was observed. The LANL ion exchange process also uses a different resin than was used in the FWR column. The LANL column uses Reillex HPQ{trademark} resin, which is more resistant to attack by nitric acid than the Ionac 641{trademark} resin used in the FWR column. Heat generation from the resin oxidation reaction with nitric acid is neglected in this analysis since LANL will be treating the resin to remove the LTE prior to loading the resin in the columns. Calculations were performed using a finite difference computer code, which incorporates models for absorption and elution of plutonium and for forced and natural convection within the resin bed. Calculations for normal column operation during loading were performed using an initial temperature and a feed temperature equal to the ambient air temperature. The model for the normal flow calculations did not include natural convection within the resin bed. The no flow calculations were started with the temperature and concentration profiles at the end of the loading stage, when there would be a maximum amount of plutonium either adsorbed on the resin or in the feed solution in the column.

Laurinat, J

2006-04-11T23:59:59.000Z

130

Wave interaction with a fixed vertical flat plate  

E-Print Network [OSTI]

. Hydrofoil definition sketch. The sharp-edged gust problem and the problem of a step-wise cnange in the velocity perpendicular to the foil offers insight into the response of a foil subject to an oscillating fluid. A sharp-edged gust with an initial... forces on a thin flat plate with a standard hydrofoil thickness was determined experimentally in a two-dimensional wave tank. Non-dimensional parameters were plotted and used to evaluate the data. It was shown that lift can be generated on a flat...

Glover, Lanny Bruce

1985-01-01T23:59:59.000Z

131

Superintegrability in a non-conformally-flat space  

E-Print Network [OSTI]

Superintegrable systems in two- and three-dimensional spaces of constant curvature have been extensively studied. From these, superintegrable systems in conformally flat spaces can be constructed by Staeckel transform. In this paper a method developed to establish the superintegrability of the Tremblay-Turbiner-Winternitz system in two dimensions is extended to higher dimensions and a superintegrable system on a non-conformally-flat four-dimensional space is found. In doing so, curvature corrections to the corresponding classical potential are found to be necessary. It is found that some subalgebras of the symmetry algebra close polynomially.

E. G. Kalnins; J. M. Kress; W. Miller Jr

2012-11-07T23:59:59.000Z

132

Interacting agegraphic dark energy models in non-flat universe  

E-Print Network [OSTI]

A so-called "agegraphic dark energy" was recently proposed to explain the dark energy-dominated universe. In this Letter, we generalize the agegraphic dark energy models to the universe with spatial curvature in the presence of interaction between dark matter and dark energy. We show that these models can accommodate $w_D = -1 $ crossing for the equation of state of dark energy. In the limiting case of a flat universe, i.e. $k = 0$, all previous results of agegraphic dark energy in flat universe are restored.

Ahmad Sheykhi

2009-09-12T23:59:59.000Z

133

Insitu expanding foam based carbon/epoxy sandwich jackets for column retrofit  

E-Print Network [OSTI]

the construction and testing of 6 concrete columns and aUp Creating Gap with Concrete Base Column testing continuedagainst the concrete base was witnessed during testing and

Danyeur, Alicia

2008-01-01T23:59:59.000Z

134

Film cooling on a flat plate: investigating density  

E-Print Network [OSTI]

This study is an investigation of two specific effects on turbine blade film cooling. The effect of coolant to mainstream density ratio and upstream steps was studied. The studies were conducted on two flat plates with 4mm cylindrical film cooling...

Grizzle, Joshua Peter Fletcher

2009-05-15T23:59:59.000Z

135

Rocky Flats Cleanup Agreement implementation successes and challenges  

SciTech Connect (OSTI)

On July 19, 1996 the US Department of Energy (DOE), State of Colorado (CDPHE), and US Environmental Protection Agency (EPA) entered into an agreement called the Rocky Flats Cleanup Agreement (RFCA) for the cleanup and closure of the Rocky Flats Environmental Technology Site (RFETS or Rocky Flats). Major elements of the agreement include: an Integrated Site-Wide Baseline; up to twelve significant enforceable milestones per year; agreed upon soil and water action levels and standards for cleanup; open space as the likely foreseeable land use; the plutonium and TRU waste removed by 2015; streamlined regulatory process; agreement with the Defense Nuclear Facilities Safety Board (DNFSB) to coordinate activities; and a risk reduction focus. Successful implementation of RFCA requires a substantial effort by the parties to change their way of thinking about RFETS and meet the deliverables and commitments. Substantial progress toward Site closure through the implementation of RFCA has been accomplished in the short time since the signing, yet much remains to be done. Much can be learned from the Rocky Flats experience by other facilities in similar situations.

Shelton, D.C.

1997-02-01T23:59:59.000Z

136

Avoidance of a Landau pole by flat contributions in QED  

SciTech Connect (OSTI)

We consider massless Quantum Electrodynamics in the momentum scheme and carry forward an approach based on Dyson–Schwinger equations to approximate both the ?-function and the renormalized photon self-energy (Yeats, 2011). Starting from the Callan–Symanzik equation, we derive a renormalization group (RG) recursion identity which implies a non-linear ODE for the anomalous dimension and extract a sufficient but not necessary criterion for the existence of a Landau pole. This criterion implies a necessary condition for QED to have no such pole. Solving the differential equation exactly for a toy model case, we integrate the corresponding RG equation for the running coupling and find that even though the ?-function entails a Landau pole it exhibits a flat contribution capable of decreasing its growth, in other cases possibly to the extent that such a pole is avoided altogether. Finally, by applying the recursion identity, we compute the photon propagator and investigate the effect of flat contributions on both spacelike and timelike photons. -- Highlights: •We present an approach to approximate both the ?-function and the photon self-energy. •We find a sufficient criterion for the self-energy to entail the existence of a Landau pole. •We study non-perturbative ‘flat’ contributions that emerge within the context of our approach. •We discuss a toy model and how it is affected by flat contributions.

Klaczynski, Lutz, E-mail: lutz.klaczynski@gmx.de [Department of Physics, Humboldt University Berlin, 12489 Berlin (Germany); Kreimer, Dirk, E-mail: kreimer@mathematik.hu-berlin.de [Alexander von Humboldt Chair in Mathematical Physics, Humboldt University, Berlin 12489 (Germany)

2014-05-15T23:59:59.000Z

137

Flatness of heavy chain systems Nicolas Petit 1  

E-Print Network [OSTI]

.e. trolleys carrying a fixed length heavy chain that may carry a load, is addressed in the partial derivatives the homogeneous chain carrying a load, see equation (13). In [11] the flatness [3, 4] of heavy chain systems, i dimensional case. Under small angle approximations, these heavy chain systems are described by a 1D partial

138

NATURAL HERITAGE RESOURCES OF THE ROCKY FLATS ENVIRONMENTAL TECHNOLOGY SITE  

E-Print Network [OSTI]

NATURAL HERITAGE RESOURCES OF THE ROCKY FLATS ENVIRONMENTAL TECHNOLOGY SITE AND THEIR CONSERVATION. Dr. Fred Harrington, Dr. Mark Bakeman, and Alison Deans of the Pawnee Natural History Society Environmental Technology Site (RFETS). The exclusion of the general public over the last 20 to 40 years has

139

Control of an industrial polymerization reactor using flatness *, P. Rouchona  

E-Print Network [OSTI]

Control of an industrial polymerization reactor using flatness N. Petita, *, P. Rouchona , J the system under consideration is the lar- gest propylene polymerization plant in the world [15]. Originally and with precision to optimize profit. This critical issue arises in different polymerization processes, see

140

No Open or Flat Bouncing Cosmologies in Einstein Gravity  

E-Print Network [OSTI]

We show that bouncing open or flat Friedmann-Robertson-Walker cosmologies are inconsistent with worldsheet string theory to first approximation. Specifically, the Virasoro constraint translates to the null energy condition in spacetime at leading order in the alpha-prime expansion. Thus one must go beyond minimally-coupled Einstein gravity in order to find bounce solutions.

Parikh, Maulik K

2015-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "flat column stars" 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

Interacting generalized Chaplygin gas model in non-flat universe  

E-Print Network [OSTI]

We employ the generalized Chaplygin gas of interacting dark energy to obtain the equation of state for the generalized Chaplygin gas energy density in non-flat universe. By choosing a negative value for $B$ we see that $w_{\\rm \\Lambda}^{eff}< -1$, that corresponds to a universe dominated by phantom dark energy.

M R Setare

2007-11-04T23:59:59.000Z

142

Differentially Flat Trajectory Generation for a Dynamically Stable Mobile Robot  

E-Print Network [OSTI]

for the ballbot, a dynamically stable mobile robot which balances on a single spherical wheel. To this end, assumptions are made to form the system as differentially flat, and a method of deriving feasible trajectories, dynamically stable mobile robot. It is a human-sized robot that balances on a single spherical wheel

143

Mini-Course ECC'97, Brussels 8 FLAT SYSTEMS  

E-Print Network [OSTI]

Mini-Course ECC'97, Brussels 8 FLAT SYSTEMS Ph. Martin R.M. Murray P. Rouchon Centre Automatique et Syst`emes, ´Ecole des Mines de Paris, 35 rue Saint-Honor´e, 77305 Fontainebleau, FRANCE. [martin. murray@indra.caltech.edu. Introduction Control systems are ubiquitous in modern technology. The use

Paris-Sud XI, Université de

144

Spectral Formation in X-Ray Pulsar Accretion Columns  

E-Print Network [OSTI]

We present the first self-consistent model for the dynamics and the radiative transfer occurring in bright X-ray pulsar accretion columns, with a special focus on the role of the shock in energizing the emerging X-rays. The pressure inside the accretion column of a luminous X-ray pulsar is dominated by the photons, and consequently the equations describing the coupled radiative-dynamical structure must be solved simultaneously. Spectral formation in these sources is therefore a complex, nonlinear phenomenon. We obtain the analytical solution for the Green's function describing the upscattering of monochromatic radiation injected into the column from the thermal mound located near the base of the flow. The Green's function is convolved with a Planck distribution to model the X-ray spectrum resulting from the reprocessing of blackbody photons produced in the thermal mound. These photons diffuse through the infalling gas and eventually escape out the walls of the column, forming the observed X-ray spectrum. We show that the resulting column-integrated, phase-averaged spectrum has a power-law shape at high energies and a blackbody shape at low energies, in agreement with the observational data for many X-ray pulsars.

Peter A. Becker; Michael T. Wolff

2005-03-03T23:59:59.000Z

145

Extraplanar Dust and Star Formation in Nearby Edge-On Galaxies  

E-Print Network [OSTI]

We present high-resolution ( 0.5 - 2.0. If Milky Way gas-to-dust relationships are appropriate, then these structures have gaseous column densities N_H > 10(21) cm(-2), with very large masses (>10(5) - 10(6) solar masses) and gravitational potential energies (> 10(51) - 10(52) ergs relative to z=0). The estimated column densities suggest molecular gas may be present, and with the estimated masses allows for the possibility of star formation in these dusty clouds. Recent star formation is the likely cause of the discrete H II regions, in some cases associated with relatively blue continuum sources, observed at heights 0.6 < |z| < 0.8 kpc above the disks of these galaxies. The presence of early-type stars at high-z in these galaxies may be related to the extraplanar dust structures seen in our images.

J. Christopher Howk; Blair D. Savage

1998-10-27T23:59:59.000Z

146

Engineering Development of Slurry Bubble Column Reactor (SBCR) Technology  

SciTech Connect (OSTI)

The major technical objectives of this program are threefold: (1) to develop the design tools and a fundamental understanding of the fluid dynamics of a slurry bubble column reactor to maximize reactor productivity, (2) to develop the mathematical reactor design models and gain an understanding of the hydrodynamic fundamentals under industrially relevant process conditions, and (3) to develop an understanding of the hydrodynamics and their interaction with the chemistries occurring in the bubble column reactor. Successful completion of these objectives will permit more efficient usage of the reactor column and tighter design criteria, increase overall reactor efficiency, and ensure a design that leads to stable reactor behavior when scaling up to large diameter reactors.

Toseland, B.A.

1998-10-29T23:59:59.000Z

147

ENGINEERING DEVELOPMENT OF SLURRY BUBBLE COLUMN REACTOR (SBCR) TECHNOLOGY  

SciTech Connect (OSTI)

The major technical objectives of this program are threefold: (1) to develop the design tools and a fundamental understanding of the fluid dynamics of a slurry bubble column rector to maximize reactor productivity, (2) to develop the mathematical reactor design models and gain an understanding of the hydrodynamic fundamentals under industrially relevant process conditions, and (3) to develop an understanding of the hydrodynamics and their interaction with the chemistries occurring in the bubble column reactor. Successful completion of these objectives will permit more efficient usage of the reactor column and tighter design criteria, increase overall reactor efficiency, and ensure a design that leads to stable reactor behavior when scaling up to large diameter reactors.

Bernard A. Toseland

1998-06-30T23:59:59.000Z

148

A new model for solvent extraction in columns  

SciTech Connect (OSTI)

A new model was developed for analyzing solvent extraction processes carried out in columns. Each column is treated as a series of well-defined equilibrium stages where the backmixing (other-phase carryover) between stages can be large. By including all mass transfer effects in the backmixing value, the same number of stages can be used for all extracted components no matter what their distribution coefficients. This greatly simplifies the calculations required when modeling multicomponent solvent extraction processes. Initial testing shows the new model to be better than either the Height of an Equivalent Theoretical Plate (HETP) or the Height of a Transfer Unit (HTU) method.

Leonard, R.A.; Regalbuto, M.C.; Chamberlain, D.B.; Vandegrift, G.F.

1989-12-08T23:59:59.000Z

149

Star-ND (Multi-Dimensional Star-Identification)  

E-Print Network [OSTI]

In order to perform star-identification with lower processing requirements, multi-dimensional techniques are implemented in this research as a database search as well as to create star pattern parameters. New star pattern parameters are presented...

Spratling, Benjamin

2012-07-16T23:59:59.000Z

150

Facility overview for commercial application of selected Rocky Flats facilities  

SciTech Connect (OSTI)

The purpose of this Facility Overview is to support the Rocky Flats Local Impacts Initiative`s Request for Interest, to solicit interest from commercial corporations for utilizing buildings 865 and 883, and the equipment contained within each building, for a commercial venture. In the following sections, this document describes the Rocky Flats Site, the buildings available for lease, the equipment within these buildings, the site services available to a tenant, the human resources available to support operations in buildings 865 and 883, and the environmental condition of the buildings and property. In addition, a brief description is provided of the work performed to date to explore the potential products that might be manufactured in Buildings 865 and 883, and the markets for these products.

NONE

1996-11-01T23:59:59.000Z

151

Plane-parallel waves as duals of the flat background  

E-Print Network [OSTI]

We give a classification of non-Abelian T-duals of the flat metric in D=4 dimensions with respect to the four-dimensional continuous subgroups of the Poincare group. After dualizing the flat background, we identify majority of dual models as conformal sigma models in plane-parallel wave backgrounds, most of them having torsion. We give their form in Brinkmann coordinates. We find, besides the plane-parallel waves, several diagonalizable curved metrics with nontrivial scalar curvature and torsion. Using the non-Abelian T-duality, we find general solution of the classical field equations for all the sigma models in terms of d'Alembert solutions of the wave equation.

Ladislav Hlavaty; Ivo Petr

2014-12-03T23:59:59.000Z

152

Polymer solidification of mixed wastes at the Rocky Flats Plant  

SciTech Connect (OSTI)

The Rocky Flats Plant is pursuing polymer solidification as a viable treatment option for several mixed waste streams that are subject to land disposal restrictions within the Resource Conservation and Recovery Act provisions. Tests completed to date using both surrogate and actual wastes indicate that polyethylene microencapsulation is a viable treatment option for several mixed wastes at the Rocky Flats Plant, including nitrate salts, sludges, and secondary wastes such as ash. Treatability studies conducted on actual salt waste demonstrated that the process is capable of producing waste forms that comply with all applicable regulatory criteria, including the Toxicity Characteristic Leaching Procedure. Tests have also been conducted to evaluate the feasibility of macroencapsulating certain debris wastes in polymers. Several methods and plastics have been tested for macroencapsulation, including post-consumer recycle and regrind polyethylene.

Faucette, A.M.; Logsdon, B.W.; Lucerna, J.J.; Yudnich, R.J.

1994-02-01T23:59:59.000Z

153

Evaluation of tracking flat plate and concentrator PV systems  

SciTech Connect (OSTI)

Arizona Public Service Company has conducted side-by-side field tests of most of the leading tracking flat plate and concentrating PV technologies. The results verify the added value due to tracking, but show that additional reliability improvements are needed in most cases. Concentrator PV systems can be high performers in sunny regions. In addition, a novel inverter system design by Raytheon has demonstrated excellent performance and promises to be more reliable and have lower cost than competing technologies.

Lepley, T. [Phasor Energy Co., Phoenix, AZ (United States); Hammond, B.; Harris, A. [Arizona State Univ., Tempe, AZ (United States)

1997-12-31T23:59:59.000Z

154

DECOMMISSIONING CHALLENGES AT THE ROCKY FLATS ENVIRONMENTAL TECHNOLOGY SITE  

SciTech Connect (OSTI)

This paper presents a discussion of the demolition of the Building 788 cluster at the Rocky Flats Environmental Technology Site (RFETS) in Golden, Colorado. The Building 788 Cluster was a Resource Conservation and Recovery Act (RCRA) permitted storage facilities and ancillary structures. Topics covered include the methods employed for Project Planning, Regulatory Compliance, Waste Management, Hazard Identification, Radiological Controls, Risk Management, Field Implementation, and Cost Schedule control, and Lessons Learned and Project Closeout.

Dorr, K. A.; Hoover, J.

2002-02-25T23:59:59.000Z

155

Distributed Roughness Receptivity in a Flat Plate Boundary Layer  

E-Print Network [OSTI]

- Distributed Receptivity . . . . . 6 2. FACILITY DESCRIPTION - THE KLEBANOFF–SARIC WIND TUNNEL 11 2.1 Test Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.2 Fan and Motor... of this dissertation describes the Klebanoff–Saric Wind Tunnel facility, which was used for this experiment. Section 3 describes the experimental setup (roughness design and the flat plate model) and defines the metrics by which the flow field is decomposed...

Kuester, Matthew Scott

2014-04-18T23:59:59.000Z

156

Rocky Flats Plant Site Environmental Report: 1993 Highlights  

SciTech Connect (OSTI)

The Rocky Flats Plant Site Environmental Report provides summary information on the plant`s environmental monitoring programs and the results recorded during 1993. The report contains a compliance summary, results of environmental monitoring and other related programs, a review of environmental remediation activities, information on external gamma radiation dose monitoring, and radiation dose estimates for the surrounding population. This section provides an overview of these topics and summarizes more comprehensive discussions found in the main text of this annual report.

Not Available

1993-12-31T23:59:59.000Z

157

MEASURING THE JET POWER OF FLAT-SPECTRUM RADIO QUASARS  

SciTech Connect (OSTI)

We use frequency-dependent position shifts of flat-spectrum radio cores to estimate the kinetic power of active galactic nucleus (AGN) jets. We find a correlation between the derived jet powers and AGN narrow-line luminosity, consistent with the well-known relation for radio galaxies and steep spectrum quasars. This technique can be applied to intrinsically weak jets even at high redshift.

Shabala, S. S.; Santoso, J. S. [School of Mathematics and Physics, University of Tasmania, Private Bag 37, Hobart, TAS 7001 (Australia); Godfrey, L. E. H. [International Centre for Radio Astronomy Research, Curtin University, GPO Box U1987, Perth, Western Australia 6845 (Australia)

2012-09-10T23:59:59.000Z

158

Sex, dispersion and aggression in Western Sandpipers on the Bolivar Flats, Texas  

E-Print Network [OSTI]

Flats, located on the Bolivar Peninsula, 4. 8 km northeast of Galveston, Texas. The wintering range of Western Sandpipers extends from California and North Carolina in the north, south to Peru and Surinam (AOU 1983). The Bolivar Flats, located...

Gordon, Lynn Marie

2012-06-07T23:59:59.000Z

159

Asymptotically flat radiating solutions in third order Lovelock gravity  

SciTech Connect (OSTI)

In this paper, we present an exact spherically symmetric solution of third order Lovelock gravity in n dimensions which describes the gravitational collapse of a null dust fluid. This solution is asymptotically (anti-)de Sitter or flat depending on the choice of the cosmological constant. Using the asymptotically flat solution for n{>=}7 with a power-law form of the mass as a function of the null coordinate, we present a model for a gravitational collapse in which a null dust fluid radially injects into an initially flat and empty region. It is found that a naked singularity is inevitably formed whose strength is different for the n=7 and n{>=}8 cases. In the n=7 case, the limiting focusing condition for the strength of curvature singularity is satisfied. But for n{>=}8, the strength of curvature singularity depends on the rate of increase of mass of the spacetime. These considerations show that the third order Lovelock term weakens the strength of the curvature singularity.

Dehghani, M. H. [Physics Department and Biruni Observatory, College of Sciences, Shiraz University, Shiraz 71454 (Iran, Islamic Republic of); Research Institute for Astrophysics and Astronomy of Maragha (RIAAM), Maragha (Iran, Islamic Republic of); Farhangkhah, N. [Physics Department and Biruni Observatory, College of Sciences, Shiraz University, Shiraz 71454 (Iran, Islamic Republic of)

2008-09-15T23:59:59.000Z

160

Map of mixed prairie grassland vegetation, Rocky Flats, Colorado  

SciTech Connect (OSTI)

A color vegetation map at the scale of 1:12,000 of the area surrounding the Rocky Flats, Rockwell International Plant near Boulder, Colorado, provides a permanent record of baseline data which can be used to monitor changes in both vegetation and environment and thus to contribute to future land management and land-use policies. Sixteen mapping units based on species composition were identified, and characterized by two 10-m/sup 2/ vegetation stands each. These were grouped into prairie, pasture, and valley side on the basis of their species composition. Both the mapping units and these major groups were later confirmed by agglomerative clustering analysis of the 32 vegetation stands on the basis of species composition. A modified Bray and Curtis ordination was used to determine the environmental factor complexes controlling the distribution of vegetation at Rocky flats. Recommendations are made for future policies of environmental management and predictions of the response to environmental change of the present vegetation at the Rocky Flats site.

Clark, S J.V.; Webber, P J; Komarkova, V; Weber, W A

1980-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "flat column stars" 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

Plastic Hinging Behavior of Reinforced Concrete Bridge Columns  

E-Print Network [OSTI]

of the seismic performance of four-span large-scale bridge systems at the University of Nevada Reno that details deformations in column hinging regions during response to strong shaking events. In order to evaluate the plastic hinging regions, a photogrammetric...

Firat Alemdar, Zeynep

2010-04-27T23:59:59.000Z

162

Water column characterization of anchialine caves in Quintana Roo, Mexico  

E-Print Network [OSTI]

on temperature, salinity, dissolved oxygen, and pH of the caves. Water columns were divided into three zones, brackish, transition, and saline, and a new method was employed to define these boundaries by using "best it" calculations and subsequent regression...

Dodson, Brett Wayne

2000-01-01T23:59:59.000Z

163

COMPRESSION OF A PLASMA COLUMN OF INFINITE ELECTROCONDUCTIVITY SITUATED  

E-Print Network [OSTI]

45 COMPRESSION OF A PLASMA COLUMN OF INFINITE ELECTROCONDUCTIVITY SITUATED IN AN EXTERNAL AXIAL velocity, ion temperature, electron temperature and plasma density is analysed. The experimental results [1. Amongst the dissipative processes we are primarily concerned here with the electron heat conductivity

Boyer, Edmond

164

Modeling of Immobilized Cell Columns for Bioconversion and Wastewater Treatment  

E-Print Network [OSTI]

Modeling of Immobilized Cell Columns for Bioconversion and Wastewater Treatment Tingyue Gu* and Mei used in bioconversions to produce biological products as well as in wastewater treatment such as solvent removal from wastewater streams. In this work, a rate model is proposed to simulate this kind

Gu, Tingyue

165

Behavior of the Mass Transfer Zone in a Biosorption Column  

E-Print Network [OSTI]

that Sargassum seaweed has a high efficiency for biosorption removal of toxic heavy metals (11). The biomass in a flow-through fixed-bed column. Copper has been chosen as a typical toxic heavy metal with simple is a process whereby certain types of inactive, dead biomass may bind and concentrate heavy metals from aqueous

Volesky, Bohumil

166

Crazy heart: kinematics of the "star pile" in Abell 545  

E-Print Network [OSTI]

We study the structure and internal kinematics of the "star pile" in Abell 545 - a low surface brightness structure lying in the center of the cluster.We have obtained deep long-slit spectroscopy of the star pile using VLT/FORS2 and Gemini/GMOS, which is analyzed in conjunction with deep multiband CFHT/MEGACAM imaging. As presented in a previous study the star pile has a flat luminosity profile and its color is consistent with the outer parts of elliptical galaxies. Its velocity map is irregular, with parts being seemingly associated with an embedded nucleus, and others which have significant velocity offsets to the cluster systemic velocity with no clear kinematical connection to any of the surrounding galaxies. This would make the star pile a dynamically defined stellar intra-cluster component. The complicated pattern in velocity and velocity dispersions casts doubts on the adequacy of using the whole star pile as a dynamical test for the innermost dark matter profile of the cluster. This status is fulfille...

Salinas, Ricardo; West, Michael J; Romanowsky, Aaron J; Lloyd-Davies, Ed; Schuberth, Ylva

2011-01-01T23:59:59.000Z

167

ENGINEERING DEVELOPMENT OF SLURRY BUBBLE COLUMN REACTOR (SBCR) TECHNOLOGY  

SciTech Connect (OSTI)

The major technical objectives of this program are threefold: (1) to develop the design tools and a fundamental understanding of the fluid dynamics of a slurry bubble column reactor to maximize reactor productivity, (2) to develop the mathematical reactor design models and gain an understanding of the hydrodynamic fundamentals under industrially relevant process conditions, and (3) to develop an understanding of the hydrodynamics and their interaction with the chemistries occurring in the bubble column reactor. Successful completion of these objectives will permit more efficient usage of the reactor column and tighter design criteria, increase overall reactor efficiency, and ensure a design that leads to stable reactor behavior when scaling up to large-diameter reactors. Washington University's work during the reporting period involved the implementation of the automated calibration device, which will provide an advanced method of determining liquid and slurry velocities at high pressures. This new calibration device is intended to replace the original calibration setup, which depended on fishing lines and hooks to position the radioactive particle. The report submitted by Washington University contains a complete description of the new calibration device and its operation. Improvements to the calibration program are also discussed. Iowa State University utilized air-water bubble column simulations in an effort to determine the domain size needed to represent all of the flow scales in a gas-liquid column at a high superficial velocity. Ohio State's report summarizes conclusions drawn from the completion of gas injection phenomena studies, specifically with respect to the characteristics of bubbling-jetting at submerged single orifices in liquid-solid suspensions.

Bernard A. Toseland

2000-12-31T23:59:59.000Z

168

Thermal response of a flat heat pipe sandwich structure to a localized heat flux  

E-Print Network [OSTI]

Thermal response of a flat heat pipe sandwich structure to a localized heat flux G. Carbajal a , C The temperature distribution across a flat heat pipe sandwich structure, subjected to an intense localized thermal to the evaporator side of the flat heat pipe, while the condenser side was cooled via natural convective

Wadley, Haydn

169

Neutron Stars and Fractal Dimensionality  

E-Print Network [OSTI]

We argue that the material inside Neutron stars behaves anomalously with fractal statistics and that in principle, we could induce mini Neutron stars, with the release of energy.

Burra G. Sidharth

2008-05-06T23:59:59.000Z

170

THE PROGRESSION OF STAR FORMATION IN THE ROSETTE MOLECULAR CLOUD  

SciTech Connect (OSTI)

Using Spitzer Space Telescope and Chandra X-Ray Observatory data, we identify young stellar objects (YSOs) in the Rosette Molecular Cloud (RMC). By being able to select cluster members and classify them into YSO types, we are able to track the progression of star formation locally within the cluster environments and globally within the cloud. We employ the nearest neighbor method analysis to explore the density structure of the clusters and YSO ratio mapping to study age progressions in the cloud. We find a relationship between the YSO ratios and extinction that suggests star formation occurs preferentially in the densest parts of the cloud and that the column density of gas rapidly decreases as the region evolves. This suggests rapid removal of gas may account for the low star formation efficiencies observed in molecular clouds. We find that the overall age spread across the RMC is small. Our analysis suggests that star formation started throughout the complex around the same time. Age gradients in the cloud appear to be localized and any effect the H II region has on the star formation history is secondary to that of the primordial collapse of the cloud.

Ybarra, Jason E.; Lada, Elizabeth A. [Department of Astronomy, University of Florida, Gainesville, FL 32605 (United States); Roman-Zuniga, Carlos G. [Instituto de Astronomia, Universidad Nacional Autonoma de Mexico, Unidad Academica de Ensenada, Apdo. Postal 22860, Ensenada, B. C. (Mexico); Balog, Zoltan [Max-Planck-Institut fuer Astronomie, Heidelberg (Germany); Wang Junfeng [Department of Physics and Astronomy and Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA), Northwestern University, 2131 Tech Dr, Evanston, IL 60208 (United States); Feigelson, Eric D., E-mail: jybarra@astro.ufl.edu [Pennsylvania State University, University Park, PA 16802 (United States)

2013-06-01T23:59:59.000Z

171

Dark Stars: A Review  

E-Print Network [OSTI]

Dark Stars (DS) are stellar objects made (almost entirely) of ordinary atomic material but powered by the heat from Dark Matter (DM) annihilation (rather than by fusion). Weakly Interacting Massive Particles (WIMPs), among the best candidates for DM, can be their own antimatter and can accumulate inside the star, with their annihilation products thermalizing with and heating the DS. The resulting DSs are in hydrostatic and thermal equilibrium. The first phase of stellar evolution in the history of the Universe may have been dark stars. Though DM constituted only $power the star for millions to billions of years. Depending on their DM environment, early DSs can become very massive ($>10^6 M_\\odot$), very bright ($>10^9 L_\\odot$), and potentially detectable with the James Webb Space Telescope (JWST). Once the DM runs out and the dark star dies, it may collapse to a black hole; thus DSs can provide seeds for the supermassive black holes observed throughout the Universe and at early times. Other sites for dark star formation exist in the Universe today in regions of high dark matter density such as the centers of galaxies. The current review briefly discusses DSs existing today but focuses on the early generation of dark stars.

Katherine Freese; Tanja Rindler-Daller; Douglas Spolyar; Monica Valluri

2015-01-10T23:59:59.000Z

172

Planets of young stars  

E-Print Network [OSTI]

Since the first massive planet in a short period orbit was discovered, the question arised how such an object could have formed. There are basically two formation scenarios: migration due to planet-disk or planet-planet interaction. Which of the two scenarios is more realistic can be found out by observing short-period planets of stars with an age between 10E7 and 10E8 yrs. The second aim of the survey is to find out how many planets originally formed, and how many of these are destroyed in the first Gyrs: Do most young, close-in planets evaporate, or spiral into the host stars? In here we report on the first results of a radial-velocity search program for planets of young stars which we began in 2004. Using HARPS, we currently monitor 85 stars with ages between 10E7 and 10E8 yrs. We show that the detection of planets of young stars is possible. Up to now, we have identified 3 planet-candidates. Taking this result together with the results of other surveys, we conclude that the frequency of massive-short period planets of young stars is not dramatically higher than that of old stars.

E. W. Guenther; E. Esposito

2007-01-10T23:59:59.000Z

173

Hyperons in neutron stars  

E-Print Network [OSTI]

Using the Dirac-Brueckner-Hartree-Fock approach, the properties of neutron-star matter including hyperons are investigated. In the calculation, we consider both time and space components of the vector self-energies of baryons as well as the scalar ones. Furthermore, the effect of negative-energy states of baryons is partly taken into account. We obtain the maximum neutron-star mass of $2.08\\,M_{\\odot}$, which is consistent with the recently observed, massive neutron stars. We discuss a universal, repulsive three-body force for hyperons in matter.

Katayama, Tetsuya

2015-01-01T23:59:59.000Z

174

Rocky Flats Neutron Detector Testing at Valduc, France  

SciTech Connect (OSTI)

Recent program requirements of the US Department of Energy/NNSA have led to a need for a criticality accident alarm system to be installed at a newly activated facility. The Criticality Safety Group of the Lawrence Livermore National Laboratory (LLNL) was able to recover and store for possible future use approximately 200 neutron criticality detectors and 20 master alarm panels from the former Rocky Flats Plant in Golden, Colorado when the plant was closed. The Criticality Safety Group participated in a facility analysis and evaluation, the engineering design and review process, as well as the refurbishment, testing, and recalibration of the Rocky Flats criticality alarm system equipment to be used in the new facility. In order to demonstrate the functionality and survivability of the neutron detectors to the effects of an actual criticality accident, neutron detector testing was performed at the French CEA Valduc SILENE reactor from October 7 to October 19, 2010. The neutron detectors were exposed to three criticality events or pulses generated by the SILENE reactor. The first excursion was performed with a bare or unshielded reactor, and the second excursion was made with a lead shielded/reflected reactor, and the third excursion with a polyethylene reflected core. These tests of the Rocky Flats neutron detectors were performed as a part of the 2010 Criticality Accident Alarm System Benchmark Measurements at the SILENE Reactor. The principal investigators for this series of experiments were Thomas M. Miller and John C. Wagner of the Oak Ridge National Laboratory, with Nicolas Authier and Nathalie Baclet of CEA Valduc. Several other organizations were also represented, including the Y-12 National Security Complex, Lawrence Livermore National Laboratory, Los Alamos National Laboratory, CEA Saclay, and Babcock International Group.

Kim, S S; Dulik, G M

2011-01-03T23:59:59.000Z

175

Entanglement entropy in Galilean conformal field theories and flat holography  

E-Print Network [OSTI]

We present the analytical calculation of entanglement entropy for a class of two dimensional field theories governed by the symmetries of the Galilean conformal algebra, thus providing a rare example of such an exact computation. These field theories are the putative holographic duals to theories of gravity in three-dimensional asymptotically flat spacetimes. We provide a check of our field theory answers by an analysis of geodesics. We also exploit the Chern-Simons formulation of three-dimensional gravity and adapt recent proposals of calculating entanglement entropy by Wilson lines in this context to find an independent confirmation of our results from holography.

Arjun Bagchi; Rudranil Basu; Daniel Grumiller; Max Riegler

2014-10-15T23:59:59.000Z

176

East Flat Rock, North Carolina: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 NoPublic Utilities Address:011-DNA Jump37. It is classified asThis article is aAg Products JumpFarmingdale, NewFlat

177

ROCKY FLATS CLOSURE PROJECT EM, AUG 2006 | Department of Energy  

Office of Environmental Management (EM)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "of Energy Power Systems Engineering Research and DevelopmentDepartmentinBattery TechnologyJanuaryROCKY FLATS

178

Deep Resistivity Structure of Yucca Flat, Nevada Test Site, Nevada.  

SciTech Connect (OSTI)

The Department of Energy (DOE) and the National Nuclear Security Administration (NNSA) at their Nevada Site Office are addressing groundwater contamination resulting from historical underground nuclear testing through the Environmental Management program and, in particular, the Underground Test Area project. One issue of concern is the nature of the somewhat poorly constrained pre Tertiary geology and its effects on ground-water flow in the area adjacent to a nuclear test. Ground water modelers would like to know more about the hydrostratigraphy and geologic structure to support a hydrostratigraphic framework model that is under development for the Yucca Flat Corrective Action Unit (CAU). During 2003, the U.S. Geological Survey, supported by the DOE and NNSA-NSO, collected and processed data from 51 magnetotelluric (MT) and audio-magnetotelluric (AMT) stations at the Nevada Test Site in and near Yucca Flat to assist in characterizing the pre-Tertiary geology in that area. The primary purpose was to refine the character, thickness, and lateral extent of pre Tertiary confining units. In particular, a major goal has been to define the upper clastic confining unit (late Devonian – Mississippian-age siliciclastic rocks assigned to the Eleana Formation and Chainman Shale) in the Yucca Flat area. The MT and AMT data have been released in separate USGS Open File Reports. The Nevada Test Site magnetotelluric data interpretation presented in this report includes the results of detailed two-dimensional (2 D) resistivity modeling for each profile (including alternative interpretations) and gross inferences on the three dimensional (3 D) character of the geology beneath each station. The character, thickness, and lateral extent of the Chainman Shale and Eleana Formation that comprise the Upper Clastic Confining Unit are generally well determined in the upper 5 km. Inferences can be made regarding the presence of the Lower Clastic Confining Unit at depths below 5 km. Large fault structures such as the CP Thrust fault, the Carpetbag fault, and the Yucca fault that cross Yucca Flat are also discernable as are other smaller faults. The subsurface electrical resistivity distribution and inferred geologic structures determined by this investigation should help constrain the hydrostratigraphic framework model that is under development.

Theodore H. Asch, Brian D. Rodriguez; Jay A. Sampson; Erin L. Wallin; and Jackie M. Williams.

2006-09-18T23:59:59.000Z

179

Big Flats, Wisconsin: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 NoPublic Utilities Address: 160Benin: Energy ResourcesJersey: EnergyBerthoud,Biodiesel Place:Forge07.Daddy sFlats,

180

Windy Flats(3Q09 portion) | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 NoPublic Utilities Address: 160 East 300 South Place:ReferenceEdit JumpWill County,Windspire EnergyFlats Jump

Note: This page contains sample records for the topic "flat column stars" 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

DOE - Office of Legacy Management -- Rocky Flats SOG  

Office of Legacy Management (LM)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "ofEarlyEnergyDepartment ofDepartment ofof EnergyYou$0.C. 20545*. . : '* FEB 1972.SOG Rocky Flats Site,

182

Determination of plate efficiencies for conventional distillation columns  

E-Print Network [OSTI]

DETERMINATION OF PLATE EFFICIENCIES FOR CONVENTIONAL DISTILLATION COIUMNS A Thesis By Thomas Raymond Harris Submitted to the Graduate School of the Agricultural and Mechanical College of Texas in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE May 1962 Ma)or Sub)ect t Chemical Engineering DETERMINATION OF PLATE EFFICIENCIES FOR CONVENTIONAL DISTILLATION COLUMNS A Thesis Thomas Raymond Harris Approred as to style and content bye Chairman of ommittee Head...

Harris, Thomas Raymond

2012-06-07T23:59:59.000Z

183

Engineered Barrier Systems Thermal-Hydraulic-Chemical Column Test Report  

SciTech Connect (OSTI)

The Engineered Barrier System (EBS) Thermal-Hydraulic-Chemical (THC) Column Tests provide data needed for model validation. The EBS Degradation, Flow, and Transport Process Modeling Report (PMR) will be based on supporting models for in-drift THC coupled processes, and the in-drift physical and chemical environment. These models describe the complex chemical interaction of EBS materials, including granular materials, with the thermal and hydrologic conditions that will be present in the repository emplacement drifts. Of particular interest are the coupled processes that result in mineral and salt dissolution/precipitation in the EBS environment. Test data are needed for thermal, hydrologic, and geochemical model validation and to support selection of introduced materials (CRWMS M&O 1999c). These column tests evaluated granular crushed tuff as potential invert ballast or backfill material, under accelerated thermal and hydrologic environments. The objectives of the THC column testing are to: (1) Characterize THC coupled processes that could affect performance of EBS components, particularly the magnitude of permeability reduction (increases or decreases), the nature of minerals produced, and chemical fractionation (i.e., concentrative separation of salts and minerals due to boiling-point elevation). (2) Generate data for validating THC predictive models that will support the EBS Degradation, Flow, and Transport PMR, Rev. 01.

W.E. Lowry

2001-12-13T23:59:59.000Z

184

Masers and star formation  

E-Print Network [OSTI]

Recent observational and theoretical advances concerning astronomical masers in star forming regions are reviewed. Major masing species are considered individually and in combination. Key results are summarized with emphasis on present science and future prospects.

Vincent L. Fish

2007-04-02T23:59:59.000Z

185

Strangeness in Neutron Stars  

E-Print Network [OSTI]

It is generally agreed on that the tremendous densities reached in the centers of neutron stars provide a high-pressure environment in which several intriguing particles processes may compete with each other. These range from the generation of hyperons to quark deconfinement to the formation of kaon condensates and H-matter. There are theoretical suggestions of even more exotic processes inside neutron stars, such as the formation of absolutely stable strange quark matter. In the latter event, neutron stars would be largely composed of strange quark matter possibly enveloped in a thin nuclear crust. This paper gives a brief overview of these striking physical possibilities with an emphasis on the role played by strangeness in neutron star matter, which constitutes compressed baryonic matter at ultra-high baryon number density but low temperature which is no accessible to relativistic heavy ion collision experiments.

Fridolin Weber; Alexander Ho; Rodrigo P. Negreiros; Philip Rosenfield

2006-04-20T23:59:59.000Z

186

Holographic Neutron Stars  

E-Print Network [OSTI]

We construct in the context of the AdS/CFT correspondence degenerate composite operators in the conformal field theory that are holographically dual to degenerate stars in anti de Sitter space. We calculate the effect of the gravitational back-reaction using the Tolman-Oppenheimer-Volkoff equations, and determine the "Chandrasekhar limit" beyond which the star undergoes gravitational collapse towards a black hole.

Jan de Boer; Kyriakos Papadodimas; Erik Verlinde

2009-07-16T23:59:59.000Z

187

Chloride and Lithium Transport in Large Arrays of Undisturbed Silt Loam and Sandy Loam Soil Columns  

E-Print Network [OSTI]

Chloride and Lithium Transport in Large Arrays of Undisturbed Silt Loam and Sandy Loam Soil Columns al., 1998); and (iii) sloping lay- were extremely variable among columns. Lithium adsorption

Walter, M.Todd

188

Experimental and Analytical Studies on Old Reinforced Concrete Buildings with Seismically Vulnerable Beam-Column Joints  

E-Print Network [OSTI]

column axial load was controlled to follow the pre-definedThe column axial loads were controlled to follow Equation (The lateral load pattern is selected as follows, F i = ? i W

PARK, SANGJOON

2010-01-01T23:59:59.000Z

189

Experimental and Analytical Studies on Old Reinforced Concrete Buildings with Seismically Vulnerable Beam-Column Joints  

E-Print Network [OSTI]

compression block in the beam section at the column jointcompression block in the column section at the beam jointblock Figure IV.17 Instrumentation for rotation at the beam-joint

PARK, SANGJOON

2010-01-01T23:59:59.000Z

190

Automated metal-free multiple-column nanoLC for improved phosphopeptid...  

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

metal-free multiple-column nanoLC for improved phosphopeptide analysis sensitivity and throughput. Automated metal-free multiple-column nanoLC for improved phosphopeptide analysis...

191

Application of a Plantwide Control Design Procedure to a Distillation Column with Heat Pump  

E-Print Network [OSTI]

(Larsson & Skogestad 2001) to a distillation column heat-integrated by using a heatpump. Top-down analysis) and apply it to a distillation column with heatpump. Plantwide control design should start by formulating

Skogestad, Sigurd

192

Geologic and geotechnical assessment RFETS Building 371, Rocky Flats, Colorado  

SciTech Connect (OSTI)

This report describes the review and evaluation of the geological, geotechnical and geophysical data supporting the design basis analysis for the Rocky Flats Environmental Test Site (RFETS) Building 371. The primary purpose of the geologic and geotechnical reviews and assessments described herein are to assess the adequacy of the crustal and near surface rock and soil model used in the seismic analysis of Building 371. This review was requested by the RFETS Seismic Evaluation Program. The purpose was to determine the adequacy of data to support the design basis for Building 371, with respect to seismic loading. The objectives required to meet this goal were to: (1) review techniques used to gather data (2) review analysis and interpretations of the data; and (3) make recommendations to gather additional data if required. Where there were questions or inadequacies in data or interpretation, recommendations were made for new data that will support the design basis analysis and operation of Building 371. In addition, recommendations are provided for a geologic and geophysical assessment for a new facility at the Rocky Flats Site.

Maryak, M.E.; Wyatt, D.E.; Bartlett, S.F.; Lewis, M.R.; Lee, R.C.

1995-12-13T23:59:59.000Z

193

Using Surface Impedance for Calculating Wakefields in Flat Geometry  

DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

Beginning with Maxwell's equations and assuming only that the wall interaction can be approximated by a surface impedance, we derive formulas for the generalized longitudinal and transverse impedance in flat geometry, from which the wakefields can also be obtained. From the generalized impedances, by taking the proper limits, we obtain the normal longitudinal, dipole, and quad impedances in flat geometry. These equations can be applied to any surface impedance, such as the known dc, ac, and anomalous skin models of wall resistance, a model of wall roughness, or one for a pipe with small, periodic corrugations. We show that, for the particular case of dc wall resistance, the longitudinal impedance obtained here agrees with a known result in the literature, a result that was derived from a very general formula by Henke and Napoly. As concrete example, we apply our results to representative beam and machine parameters in the undulator region of LCLS-II and estimate the impact of the transverse wakes on the machine performance.

Bane, Karl; Stupakov, Gennady

2015-03-01T23:59:59.000Z

194

Complete pattern of ocular dominance columns in human primary visual cortex.  

E-Print Network [OSTI]

exhibit greater heterogeneity. dle of the cortex devoid oflarger V1 correlates with a dle of ocular dominance columns.

Adams, Daniel L; Sincich, Lawrence C; Horton, Jonathan C

2007-01-01T23:59:59.000Z

195

A new warmstarting strategy for the primal-dual column generation ...  

E-Print Network [OSTI]

Jun 22, 2012 ... Keywords: interior point methods, warmstarting, column generation, linear ... generation, cutting plane methods or branching techniques are ...

2012-06-22T23:59:59.000Z

196

Charge Collection Measurements in single-type column 3D Sensors  

E-Print Network [OSTI]

Charge Collection Measurements in single-type column 3D Sensors M. Scaringella*, A. Polyakov, and H sensors. In particular, 3D detectors with columns of both n-and p-doping are considered to be especially-substrate [5]. The principle of the single-type column 3D sensors is shown in Fig. 1. Their advantages over

California at Santa Cruz, University of

197

Optimal operation of a Petlyuk Distillation Column: Energy Savings by Over-fractionation  

E-Print Network [OSTI]

Optimal operation of a Petlyuk Distillation Column: Energy Savings by Over-fractionation · The Petlyuk distillation column, see Figure 1(a), with a pre-fractionator (C1) and a main column (C21 and C22) N-7465 Trondheim, Norway Abstract This work shows the unexpected result that over-fractionating one

Skogestad, Sigurd

198

Optimal Operation of a Petlyuk Distillation Column: Energy Savings by Over-fractionating  

E-Print Network [OSTI]

Optimal Operation of a Petlyuk Distillation Column: Energy Savings by Over-fractionating Vidar the unexpected result that over-fractionating one of the product streams in a Petlyuk distillation column may is optimal in some cases. 1. Introduction The Petlyuk distillation column, see Figure 1(a), with a pre-fractionator

Skogestad, Sigurd

199

EARLY-STAGE MASSIVE STAR FORMATION NEAR THE GALACTIC CENTER: Sgr C  

SciTech Connect (OSTI)

We present near-infrared spectroscopy and 1 mm line and continuum observations of a recently identified site of high mass star formation likely to be located in the Central Molecular Zone (CMZ) near Sgr C. Located on the outskirts of the massive evolved H II region associated with Sgr C, the area is characterized by an Extended Green Object (EGO) measuring ?10'' in size (0.4 pc), whose observational characteristics suggest the presence of an embedded massive protostar driving an outflow. Our data confirm that early-stage star formation is taking place on the periphery of the Sgr C H II region, with detections of two protostellar cores and several knots of H{sub 2} and Brackett ? emission alongside a previously detected compact radio source. We calculate the cores' joint mass to be ?10{sup 3} M {sub ?}, with column densities of 1-2 × 10{sup 24} cm{sup –2}. We show the host molecular cloud to hold ?10{sup 5} M {sub ?} of gas and dust with temperatures and column densities favorable for massive star formation to occur, however, there is no evidence of star formation outside of the EGO, indicating that the cloud is predominantly quiescent. Given its mass, density, and temperature, the cloud is comparable to other remarkable non-star-forming clouds such as G0.253 in the eastern CMZ.

Kendrew, S.; Johnston, K.; Beuther, H. [Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg (Germany)] [Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg (Germany); Ginsburg, A.; Bally, J.; Battersby, C. [CASA, University of Colorado at Boulder, UCB 389, Boulder, CO 80309 (United States)] [CASA, University of Colorado at Boulder, UCB 389, Boulder, CO 80309 (United States); Cyganowski, C. J., E-mail: kendrew@mpia.de [Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 (United States)

2013-10-01T23:59:59.000Z

200

Spatial distribution of isoprene emissions from North America derived from formaldehyde column measurements by the OMI satellite sensor  

E-Print Network [OSTI]

Spatial distribution of isoprene emissions from North America derived from formaldehyde column isoprene emission from North America. OMI HCHO columns for June-August 2006 are consistent distribution of OMI HCHO columns follows that of isoprene emission; anthropogenic hydrocarbon emissions

Chance, Kelly

Note: This page contains sample records for the topic "flat column stars" 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

Probing thermonuclear burning on accreting neutron stars.  

E-Print Network [OSTI]

??Neutron stars are the most compact stars that can be directly observed, which makes them ideal laboratories to study physics at extreme densities. Neutron stars… (more)

Keek, L.

2008-01-01T23:59:59.000Z

202

Coal desulfurization by bacterial treatment and column flotation. Final report  

SciTech Connect (OSTI)

A review of the literature showed that bacterial leaching, using the microorganism Thiobacillus ferrooxidans, was a very effective technique for removing pyrite from coal, as it could dissolve even the finest pyrite particles without the need for expensive reagents or extreme processing conditions. Unfortunately, bacterial leaching is also rather slow, and so the initial goal of this research was to decrease the leaching time as much as possible. However, this still left the bacteria needing approximately a week to remove half of the pyritic sulfur, and so a faster technique was sought. Since it had been reported in the literature that T. ferrooxidans could be used to depress the flotation of pyrite during froth flotation of coal, this was investigated further. By studying the recovery mechanisms of coal-pyrite in froth flotation, it was found that pyrite was being recovered by entrainment and by locking to coal particles, not by true flotation of hydrophobic pyrite. Therefore, no pyrite depressant could be of any significant benefit for keeping pyrite out of the coal froth product, and it was much more important to prevent entrainment from occurring. Countercurrent flotation columns were invented to essentially eliminate entrainment effects, by washing the froth and reducing mixing of the froth and tailings products. Existing flotation columns tend to be quite simple, and in order to give reasonable product quality they must be very tall (typically 30--45 feet). As a result, they have difficulty in handling the high froth volumes which occur in coal flotation, and are awkward to install in existing plants. The bulk of this project therefore concentrated on developing an improved coal flotation column, and testing it under actual plant conditions.

Kawatra, S.K. [Michigan Technological Univ., Houghton, MI (United States)

1994-06-01T23:59:59.000Z

203

Fundamental chromatographic equations designed for columns packed with very fine particles and operated at very high pressures applications to the prediction of elution times and the column efficiencies  

SciTech Connect (OSTI)

The wall temperatures of three Acquity-BEH-C{sub 18}columns (2.1 mm x 50, 100, and 150 mm) and the temperature of the incoming eluent were maintained constant at 289 K, using a circulating water heat exchanger. The retention times and the band broadening of naphtho[2,3-a]pyrene were measured for each column as a function of the flow rate applied. Pure acetonitrile was used as the eluent. The flow rate dependence of neither elution volumes nor bandwidths can be accounted for by classical models of retention and HETP, respectively, since these models assume columns to be isothermal. Because the heat generated by friction of the eluent against the column bed increases with increasing flow rate, the column bed cannot remain isothermal at high flow rates. This heat is evacuated radially and/or longitudinally by convection, conduction, and radiation. Radial and axial temperature gradients are formed, which are maximum and minimum, respectively, when the temperature of the column wall is kept uniform and constant. The retention times that we measured match well with the values predicted based on the temperature distribution along and across the column, which we calculated and on the temperature dependence of the retention for the same column operated isothermally (i.e., at very low flow rate). The rate of band spreading varies along non-isothermal columns, so the HETP can only be defined locally. It is a function of the axial coordinate. A new contribution is needed to account for the radial thermal heterogeneity of the column, hence the radial distribution of the flow velocities, which warps the elution band. A new model, based on the general dispersion theory of Aris, allows a successful prediction of the unusually large bandwidths observed with columns packed with fine particles, operated at high flow rates, hence high inlet pressures.

Gritti, Fabrice [University of Tennessee, Knoxville (UTK); Guiochon, Georges A [ORNL

2008-01-01T23:59:59.000Z

204

Dark Stars: A Review  

E-Print Network [OSTI]

Dark Stars (DS) are stellar objects made (almost entirely) of ordinary atomic material but powered by the heat from Dark Matter (DM) annihilation (rather than by fusion). Weakly Interacting Massive Particles (WIMPs), among the best candidates for DM, can be their own antimatter and can accumulate inside the star, with their annihilation products thermalizing with and heating the DS. The resulting DSs are in hydrostatic and thermal equilibrium. The first phase of stellar evolution in the history of the Universe may have been dark stars. Though DM constituted only $10^6 M_\\odot$), very bright ($>10^9 L_\\odot$), and potentially detectable with the James Webb Space Telescope (JWST). Once the DM runs out and the dark star dies, it may collapse to a black hole; thus DSs can provide seeds for the supermassive black holes observed throughout the Universe and at early times. Other sites for dark star formation exist in the Universe today in regions of high dark matter density such as the centers of galaxies. The curre...

Freese, Katherine; Spolyar, Douglas; Valluri, Monica

2015-01-01T23:59:59.000Z

205

Strangeness in Neutron Stars  

E-Print Network [OSTI]

It is generally agreed on that the tremendous densities reached in the centers of neutron stars provide a high-pressure environment in which numerous novel particles processes are likely to compete with each other. These processes range from the generation of hyperons to quark deconfinement to the formation of kaon condensates and H-matter. There are theoretical suggestions of even more exotic processes inside neutron stars, such as the formation of absolutely stable strange quark matter, a configuration of matter even more stable than the most stable atomic nucleus, iron. In the latter event, neutron stars would be largely composed of pure quark matter, eventually enveloped in a thin nuclear crust. No matter which physical processes are actually realized inside neutron stars, each one leads to fingerprints, some more pronounced than others though, in the observable stellar quantities. This feature combined with the unprecedented progress in observational astronomy, which allows us to see vistas with remarkable clarity that previously were only imagined, renders neutron stars to nearly ideal probes for a wide range of physical studies, including the role of strangeness in dense matter.

Fridolin Weber

2000-08-23T23:59:59.000Z

206

ARM - Field Campaign - Spring 1994 Single Column Model IOP  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth (AOD) by Microtops Atmospheric Optical DepthgovCampaignsSpring 1994 Single Column Model IOP ARM Data

207

ARM - Field Campaign - Spring 1995 Single Column Model IOP  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth (AOD) by Microtops Atmospheric Optical DepthgovCampaignsSpring 1994 Single Column Model IOP

208

ARM - Field Campaign - Two-Column Aerosol Project (TCAP)  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth (AOD) by Microtops Atmospheric Optical DepthgovCampaignsSpring(PROBE)govCampaignsTwo-Column Aerosol

209

System Advisor Model: Flat Plate Photovoltaic Performance Modeling Validation Report  

SciTech Connect (OSTI)

The System Advisor Model (SAM) is a free software tool that performs detailed analysis of both system performance and system financing for a variety of renewable energy technologies. This report provides detailed validation of the SAM flat plate photovoltaic performance model by comparing SAM-modeled PV system generation data to actual measured production data for nine PV systems ranging from 75 kW to greater than 25 MW in size. The results show strong agreement between SAM predictions and field data, with annualized prediction error below 3% for all fixed tilt cases and below 8% for all one axis tracked cases. The analysis concludes that snow cover and system outages are the primary sources of disagreement, and other deviations resulting from seasonal biases in the irradiation models and one axis tracking issues are discussed in detail.

Freeman, J.; Whitmore, J.; Kaffine, L.; Blair, N.; Dobos, A. P.

2013-12-01T23:59:59.000Z

210

Majorana Flat Bands in s-Wave Gapless Topological Superconductors  

E-Print Network [OSTI]

We demonstrate how the non-trivial interplay between spin-orbit coupling and nodeless $s$-wave superconductivity can drive a fully gapped two-band topological insulator into a time-reversal invariant gapless topological superconductor supporting symmetry-protected Majorana flat bands. We characterize topological phase diagrams by a ${\\mathbb Z}_2 \\times{\\mathbb Z}_2$ partial Berry-phase invariant, and show that, despite the trivial crystal geometry, no unique bulk-boundary correspondence exists. We trace this behavior to the anisotropic quasiparticle bulk gap closing, linear vs. quadratic, and argue that this provides a unifying principle for gapless topological superconductivity. Experimental implications for tunneling conductance measurements are addressed, relevant for lead chalcogenide materials.

Shusa Deng; Gerardo Ortiz; Amrit Poudel; Lorenza Viola

2014-04-28T23:59:59.000Z

211

Improving the diversity of manufacturing electroluminescent flat panel displays  

SciTech Connect (OSTI)

Crystalline calcium thiogallate with a cerium dopant has been deposited by metal-organic chemical vapor deposition (MOCVD) at temperatures below 600{degrees}C on a low cost glass substrate. An EL luminance of 1.05 fL was observed 40 volts above threshold at 60 Hz. This is more than an order of magnitude improvement over earlier crystalline-as-deposited thiogallate materials. These results pave the way for the use of MOCVD as a potential method for processing full color thin-film electroluminescent (TFEL) flat panel displays. The formation of the CaGa{sub 2}S{sub 4}:Ce phosphor requires precise control over a number of deposition parameters including flow rates, substrate temperature, and reactor pressure. The influence of these parameters will be discussed in terms of structure, uniformity, and TFEL device performance.

Moss, T.S.; Samuels, J.A.; Smith, D.C. [and others

1995-09-01T23:59:59.000Z

212

Epidemiologic surveillance. Annual report for EG&G Rocky Flats  

SciTech Connect (OSTI)

Epidemiologic surveillance at U.S. Department of Energy (DOE) facilities consists of regular and systematic collection, analysis, and interpretation of data on absences resulting from illness and injury in the work force. Its purpose is to provide an early warning system for health problems occurring among employees at participating sites. Data are collected by coordinators at each site and submitted to the Epidemiologic Surveillance Data Center, located at the Oak Ridge Institute for Science and Education, where quality control procedures and analyses are carried out. Rates of absences and rates of diagnoses associated with absences are analyzed by occupation and other relevant variables. They may be compared with the disease experience of different groups within the DOE work force and with populations that do not work for DOE to identify disease patterns or clusters that may be associated with work activities. This report presents the 1994 morbidity data for the Rocky Flats plant.

NONE

1994-12-31T23:59:59.000Z

213

Diffractive optics for compact flat panel displays. Final report  

SciTech Connect (OSTI)

Three years ago LLNL developed a practical method to dramatically reduce the chromatic aberration in single element diffractive imaging lenses. High efficiency, achromatic imaging lenses have been fabricated for human vision correction. This LDRD supported research in applying our new methods to develop a unique, diffraction-based optical interface with solid state, microelectronic imaging devices. Advances in microelectronics have led to smaller, more efficient components for optical systems. There have, however, been no equivalent advances in the imaging optics associated with these devices. The goal of this project was to replace the bulky, refractive optics in typical head-mounted displays with micro-thin diffractive optics to directly image flat-panel displays into the eye. To visualize the system think of the lenses of someone`s eyeglasses becoming flat-panel displays. To realize this embodiment, we needed to solve the problems of large chromatic aberrations and low efficiency that are associated with diffraction. We have developed a graceful tradeoff between chromatic aberrations and the diffractive optic thickness. It turns out that by doubling the thickness of a micro-thin diffractive lens we obtain nearly a two-times improvement in chromatic performance. Since the human eye will tolerate one diopter of chromatic aberration, we are able to achieve an achromatic image with a diffractive lens that is only 20 microns thick, versus 3 mm thickness for the comparable refractive lens. Molds for the diffractive lenses are diamond turned with sub-micron accuracy; the final lenses are cast from these molds using various polymers. We thus retain both the micro- thin nature of the diffractive optics and the achromatic image quality of refractive optics. During the first year of funding we successfully extended our earlier technology from 1 cm diameter optics required for vision applications up to the 5 cm diameter optics required for this application. 3 refs., 6 figs.

Sweeney, D.; DeLong, K.

1997-04-29T23:59:59.000Z

214

Analytical and Experimental Assessment of Seismic Vulnerability of Beam-Column Joints without Transverse Reinforcement in Concrete Buildings  

E-Print Network [OSTI]

Deformations in Reinforced Concrete Beam–Column Joints?,P. , ?Update to ASCE/SEI 41 Concrete Provisions?, EarthquakeEffective Stiffness of Reinforced Concrete Columns?, Pacific

Hassan, Wael M.

2011-01-01T23:59:59.000Z

215

E-Print Network 3.0 - amorphous selenium flat-panel Sample Search...  

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

22 Licensable Technologies Summary: 12;Licensable Technologies Applications: n Solar Cells n Sensors n Flat Panels n IC Circuits... and low-performance, low-cost...

216

amorphous silicon flat-panel: Topics by E-print Network  

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

5 Asymmetric Electrical Properties of Half Corbino Hydrogenated Amorphous Silicon Thin-Film Transistor and Its Applications to Flat Panel Displays Materials Science...

217

Flat space cosmologies in two dimensions - Phase transitions and asymptotic mass-domination  

E-Print Network [OSTI]

We study flat space cosmologies in two dimensions by taking the flat space limit of the Achucarro-Ortiz model. We unravel a phase transition between hot flat space and flat space cosmologies, and derive a new dilaton-dependent counterterm required for the consistency of the Euclidean partition function. Our results generalize to asymptotically mass-dominated 2-dimensional dilaton gravity models, whose thermodynamical properties we discuss. The novel case of asymptotic mass-domination is neither covered by the comprehensive discussion of hep-th/0703230 nor by the more recent generalization to dilaton gravity with confining U(1) charges in 1406.7007.

Arjun Bagchi; Daniel Grumiller; Jakob Salzer; Sourav Sarkar; Friedrich Schöller

2014-08-22T23:59:59.000Z

218

Spectropolarimetry of cool stars  

E-Print Network [OSTI]

In recent years, the development of spectropolarimetric techniques deeply modified our knowledge of stellar magnetism. In the case of solar-type stars, the challenge is to measure a geometrically complex field and determine its evolution over very different time frames. In this article, I summarize some important observational results obtained in this field over the last two decades and detail what they tell us about the dynamo processes that orchestrate the activity of cool stars. I also discuss what we learn from such observations about the ability of magnetic fields to affect the formation and evolution of Sun-like stars. Finally, I evoke promising directions to be explored in the coming years, thanks to the advent of a new generation of instruments specifically designed to progress in this domain.

P. Petit

2007-03-27T23:59:59.000Z

219

The Two-Column Aerosol Project (TCAP) Science Plan  

SciTech Connect (OSTI)

The Two-Column Aerosol Project (TCAP) field campaign will provide a detailed set of observations with which to (1) perform radiative and cloud condensation nuclei (CCN) closure studies, (2) evaluate a new retrieval algorithm for aerosol optical depth (AOD) in the presence of clouds using passive remote sensing, (3) extend a previously developed technique to investigate aerosol indirect effects, and (4) evaluate the performance of a detailed regional-scale model and a more parameterized global-scale model in simulating particle activation and AOD associated with the aging of anthropogenic aerosols. To meet these science objectives, the Atmospheric Radiation Measurement (ARM) Climate Research Facility will deploy the ARM Mobile Facility (AMF) and the Mobile Aerosol Observing System (MAOS) on Cape Cod, Massachusetts, for a 12-month period starting in the summer of 2012 in order to quantify aerosol properties, radiation, and cloud characteristics at a location subject to both clear and cloudy conditions, and clean and polluted conditions. These observations will be supplemented by two aircraft intensive observation periods (IOPs), one in the summer and a second in the winter. Each IOP will deploy one, and possibly two, aircraft depending on available resources. The first aircraft will be equipped with a suite of in situ instrumentation to provide measurements of aerosol optical properties, particle composition and direct-beam irradiance. The second aircraft will fly directly over the first and use a multi-wavelength high spectral resolution lidar (HSRL) and scanning polarimeter to provide continuous optical and cloud properties in the column below.

Berkowitz, CM; Berg, LK; Cziczo, DJ; Flynn, CJ; Kassianov, EI; Fast, JD; Rasch, PJ; Shilling, JE; Zaveri, RA; Zelenyuk, A; Ferrare, RA; Hostetler, CA; Cairns, B; Russell, PB; Ervens, B

2011-07-27T23:59:59.000Z

220

On the efficiency of field star capture by star clusters  

E-Print Network [OSTI]

An exciting recent finding regarding scaling relations among globular clusters is the so-called 'blue tilt': clusters of the blue sub-population follow a trend of redder colour with increasing luminosity. In this paper we evaluate to which extent field star capture over a Hubble time may explain the 'blue tilt'. We perform collisional N-body simulations to quantify the amount of field star capture occuring over a Hubble time to star clusters with 10^3 to 10^6 stars. In the simulations we follow the orbits of field stars passing through a star cluster and calculate the energy change that the field stars experience due to gravitational interaction with cluster stars during one passage through the cluster. The capture condition is that their total energy after the passage is smaller than the gravitational potential at the cluster's tidal radius. By folding this with the fly-by rates of field stars with an assumed space density as in the solar neighbourhood and a range of velocity dispersions, we derive estimates on the mass fraction of captured field stars as a function of environment. We find that integrated over a Hubble time, the ratio between captured field stars and total number of clusters stars is very low (capture is not a probable mechanism for creating the colour-magnitude trend of metal-poor globular clusters.

Steffen Mieske; Holger Baumgardt

2007-09-10T23:59:59.000Z

Note: This page contains sample records for the topic "flat column stars" 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

A Star on Earth  

ScienceCinema (OSTI)

At the Energy Department's Princeton Plasma Physics Lab, scientists are trying to accomplish what was once considered the realm of science fiction: create a star on Earth. The National Spherical Torus Experiment (NSTX) is a magnetic fusion device that is used to study the physics principles of spherically shaped plasmas -- hot ionized gases in which, under the right conditions, nuclear fusion will occur. Fusion is the energy source of the sun and all of the stars. Not just limited to theoretical work, the NSTX is enabling cutting-edge research to develop fusion as a future energy source.

Prager, Stewart; Zwicker, Andrew; Hammet, Greg; Tresemer, Kelsey; Diallo, Ahmed

2014-06-06T23:59:59.000Z

222

Isolating Triggered Star Formation  

SciTech Connect (OSTI)

Galaxy pairs provide a potentially powerful means of studying triggered star formation from galaxy interactions. We use a large cosmological N-body simulation coupled with a well-tested semi-analytic substructure model to demonstrate that the majority of galaxies in close pairs reside within cluster or group-size halos and therefore represent a biased population, poorly suited for direct comparison to 'field' galaxies. Thus, the frequent observation that some types of galaxies in pairs have redder colors than 'field' galaxies is primarily a selection effect. We use our simulations to devise a means to select galaxy pairs that are isolated in their dark matter halos with respect to other massive subhalos (N= 2 halos) and to select a control sample of isolated galaxies (N= 1 halos) for comparison. We then apply these selection criteria to a volume-limited subset of the 2dF Galaxy Redshift Survey with M{sub B,j} {le} -19 and obtain the first clean measure of the typical fraction of galaxies affected by triggered star formation and the average elevation in the star formation rate. We find that 24% (30.5 %) of these L* and sub-L* galaxies in isolated 50 (30) h{sup -1} kpc pairs exhibit star formation that is boosted by a factor of {approx}> 5 above their average past value, while only 10% of isolated galaxies in the control sample show this level of enhancement. Thus, 14% (20 %) of the galaxies in these close pairs show clear triggered star formation. Our orbit models suggest that 12% (16%) of 50 (30) h{sup -1} kpc close pairs that are isolated according to our definition have had a close ({le} 30 h{sup -1} kpc) pass within the last Gyr. Thus, the data are broadly consistent with a scenario in which most or all close passes of isolated pairs result in triggered star formation. The isolation criteria we develop provide a means to constrain star formation and feedback prescriptions in hydrodynamic simulations and a very general method of understanding the importance of triggered star formation in a cosmological context.

Barton, Elizabeth J.; Arnold, Jacob A.; /UC, Irvine; Zentner, Andrew R.; /KICP, Chicago /Chicago U., EFI; Bullock, James S.; /UC, Irvine; Wechsler, Risa H.; /KIPAC, Menlo

2007-09-12T23:59:59.000Z

223

Synthetic guide star generation  

DOE Patents [OSTI]

A system for assisting in observing a celestial object and providing synthetic guide star generation. A lasing system provides radiation at a frequency at or near 938 nm and radiation at a frequency at or near 1583 nm. The lasing system includes a fiber laser operating between 880 nm and 960 nm and a fiber laser operating between 1524 nm and 1650 nm. A frequency-conversion system mixes the radiation and generates light at a frequency at or near 589 nm. A system directs the light at a frequency at or near 589 nm toward the celestial object and provides synthetic guide star generation.

Payne, Stephen A. (Castro Valley, CA) [Castro Valley, CA; Page, Ralph H. (Castro Valley, CA) [Castro Valley, CA; Ebbers, Christopher A. (Livermore, CA) [Livermore, CA; Beach, Raymond J. (Livermore, CA) [Livermore, CA

2008-06-10T23:59:59.000Z

224

A Star on Earth  

SciTech Connect (OSTI)

At the Energy Department's Princeton Plasma Physics Lab, scientists are trying to accomplish what was once considered the realm of science fiction: create a star on Earth. The National Spherical Torus Experiment (NSTX) is a magnetic fusion device that is used to study the physics principles of spherically shaped plasmas -- hot ionized gases in which, under the right conditions, nuclear fusion will occur. Fusion is the energy source of the sun and all of the stars. Not just limited to theoretical work, the NSTX is enabling cutting-edge research to develop fusion as a future energy source.

Prager, Stewart; Zwicker, Andrew; Hammet, Greg; Tresemer, Kelsey; Diallo, Ahmed

2014-03-05T23:59:59.000Z

225

The Austin Energy Star Program  

E-Print Network [OSTI]

The Austin Energy Star Program is an Austin-specific energy rating system implemented in July, 1985. Since the first builders joined the program, Energy Star has gone through significant improvements vithout changing the fundamental marketing theme...

Seiter, D. L.

1988-01-01T23:59:59.000Z

226

Flat Rock, Michigan: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 NoPublicIDAPowerPlantSitingConstruction.pdfNotify98.pdf Jump to:Siting.pdfFiskdale,Five StarFlash Steam

227

Flat Rock, North Carolina: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 NoPublicIDAPowerPlantSitingConstruction.pdfNotify98.pdf Jump to:Siting.pdfFiskdale,Five StarFlash Steam512357°,

228

High-gravity central stars  

E-Print Network [OSTI]

NLTE spectral analyses of high-gravity central stars by means of state-of-the-art model atmosphere techniques provide information about the precursor AGB stars. The hydrogen-deficient post-AGB stars allow investigations on the intershell matter which is apparently exhibited at the stellar surface. We summarize recent results from imaging, spectroscopy, and spectropolarimetry.

Thomas Rauch

2006-07-11T23:59:59.000Z

229

Energy generation in stars  

E-Print Network [OSTI]

It is a current opinion that thermonuclear fusion is the main source of the star activity. It is shown below that this source is not unique. There is another electrostatic mechanism of the energy generation which accompanies thermonuclear fusion. Probably, this approach can solve the solar neutrino problem.

B. V. Vasiliev

2001-10-29T23:59:59.000Z

230

Small Column Ion Exchange Design and Safety Strategy  

SciTech Connect (OSTI)

Small Column Ion Exchange (SCIX) is a transformational technology originally developed by the Department of Energy (DOE) Environmental Management (EM-30) office and is now being deployed at the Savannah River Site (SRS) to significantly increase overall salt processing capacity and accelerate the Liquid Waste System life-cycle. The process combines strontium and actinide removal using Monosodium Titanate (MST), Rotary Microfiltration, and cesium removal using Crystalline Silicotitanate (CST, specifically UOP IONSIV{reg_sign}IE-911 ion exchanger) to create a low level waste stream to be disposed in grout and a high level waste stream to be vitrified. The process also includes preparation of the streams for disposal, e.g., grinding of the loaded CST material. These waste processing components are technically mature and flowsheet integration studies are being performed including glass formulations studies, application specific thermal modeling, and mixing studies. The deployment program includes design and fabrication of the Rotary Microfilter (RMF) assembly, ion-exchange columns (IXCs), and grinder module, utilizing an integrated system safety design approach. The design concept is to install the process inside an existing waste tank, Tank 41H. The process consists of a feed pump with a set of four RMFs, two IXCs, a media grinder, three Submersible Mixer Pumps (SMPs), and all supporting infrastructure including media receipt and preparation facilities. The design addresses MST mixing to achieve the required strontium and actinide removal and to prevent future retrieval problems. CST achieves very high cesium loadings (up to 1,100 curies per gallon (Ci/gal) bed volume). The design addresses the hazards associated with this material including heat management (in column and in-tank), as detailed in the thermal modeling. The CST must be size reduced for compatibility with downstream processes. The design addresses material transport into and out of the grinder and includes provisions for equipment maintenance including remote handling. The design includes a robust set of nuclear safety controls compliant with DOE Standard (STD)-1189, Integration of Safety into the Design Process. The controls cover explosions, spills, boiling, aerosolization, and criticality. Natural Phenomena Hazards (NPH) including seismic event, tornado/high wind, and wildland fire are considered. In addition, the SCIX process equipment was evaluated for impact to existing facility safety equipment including the waste tank itself. SCIX is an innovative program which leverages DOE's technology development capabilities to provide a basis for a successful field deployment.

Huff, T.; Rios-Armstrong, M.; Edwards, R.; Herman, D.

2011-02-07T23:59:59.000Z

231

Late Quaternary geomorphology and soils in Crater Flat, Yucca Mountain area, southern Nevada  

E-Print Network [OSTI]

Late Quaternary geomorphology and soils in Crater Flat, Yucca Mountain area, southern Nevada for a Crater Flat cation-leaching curve. This curve differs somewhat from a previous Yucca Mountain curve­10 from a previous ``surficial deposits'' stratigraphy used in the Yucca Mountain area. Although

Dorn, Ron

232

FLAT PLATE HEAT PIPES: FROM OBSERVATIONS TO THE MODELING OF THE CAPILLARY STUCTURE  

E-Print Network [OSTI]

1 FLAT PLATE HEAT PIPES: FROM OBSERVATIONS TO THE MODELING OF THE CAPILLARY STUCTURE Frédéric ABSTRACT This paper presents a synthesis of observations made inside six different flat plate heat pipes to estimate the performance of the heat pipe in a real application with several electronic components

Paris-Sud XI, Université de

233

FOREST-AIR FLUXES OF CARBON, WATER AND ENERGY OVER NON-FLAT TERRAIN  

E-Print Network [OSTI]

FOREST-AIR FLUXES OF CARBON, WATER AND ENERGY OVER NON-FLAT TERRAIN XUHUI LEE and XINZHANG HU-air exchange of carbon, water, and energy was conducted at a mid-latitude, mixed forest on non-flat terrain to address this question, we conducted a field experiment on energy and carbon exchanges in a mixed forest

Lee, Xuhui

234

Holographic Dark Energy with Time Varying n^2 Parameter in Non-Flat Universe  

E-Print Network [OSTI]

We consider a holographic dark energy model, with a varying parameter, n, which evolves slowly with time. We obtain the differential equation describing evolution of the dark energy density parameter, $\\Omega_d$, for the flat and non-flat FRW universes. The equation of state parameter in this generalized version of holographic dark energy depends on n.

Bushra Majeed; Mubasher Jamil; Azad A. Siddiqui

2014-11-01T23:59:59.000Z

235

Self-Assembly of Flat Micro Components by Capillary Forces and Shape Recognition  

E-Print Network [OSTI]

Self-Assembly of Flat Micro Components by Capillary Forces and Shape Recognition J. Fang, S. Liang, K. Wang, X. Xiong, K. F. Böhringer* This paper summarizes our recent reports on self-assembly of flat micro components based on two major mechanisms: capillary-driven self-assembly and feature

236

Neutron stars and quark stars: Two coexisting families of compact stars?  

E-Print Network [OSTI]

The mass-radius relation of compact stars is discussed with relation to the presence of quark matter in the core. The existence of a new family of compact stars with quark matter besides white dwarfs and ordinary neutron stars is outlined.

J. Schaffner-Bielich

2006-12-29T23:59:59.000Z

237

Evaluation of fluoride-induced metal mobilization in soil columns  

SciTech Connect (OSTI)

Fluoride in soil solution may cause substantially increased leaching of dissolved organic carbon (DOC), Al, and heavy metals from soils. The authors objective was to examine whether increased metal solubility is attributable to formation of fluoro- or organo-complexes. The A horizon of a Slovak soil contaminated with heavy metals and F by Al smelter emissions was used to conduct two column experiments under saturated and steady-state water flow conditions. The columns were leached with 5 mM Na{sub 2}SO{sub 4}, 1 mM NaCl, and 9 mM NaF solutions at pH 5.5 and an electrical conductivity of 1,000 {micro}S cm{sup {minus}1}. Samples were collected in 70-min intervals for approximately 7 d. Two experiments were performed. In the first experiment (single F pulse), a fluoride (F) pulse was applied for 36 pore volumes (PVs), while in the second experiment (dual F pulse), two consecutive F pulses (each for 2.8 PVs) were applied. For both experiments, Cl breakthrough curves (BTCs) revealed a convection-dominated transport regime. The breakthrough of Cd, Cr, Fe, Ni, and Pb paralleled DOC breakthrough in both experiments indicating metal leaching as organocomplex. In the dual F pulse experiment, peak separation of the DOC and the complexed F (F{sub bound}) breakthrough was achieved. The highest F{sub bound} concentration occurred 3.8 PVs later than that of DOC. The AlBTC paralleled that of F{sub bound} but showed tailing with a turning point simultaneous to the highest DOC concentration. Thus, the increase in Al solubility was mainly caused by fluoro-complexation and only to a lesser extent by organo-complexation.

Totsche, K.U.; Wilcke, W.; Koerber, M.; Kobza, J.; Zech, W.

2000-04-01T23:59:59.000Z

238

Seismic equipment qualification at Rocky Flats Plant: Lessons learned  

SciTech Connect (OSTI)

Seismic equipment qualification is being evaluated as a part of the Systematic Evaluation Program (SEP) at Rocky Flats Plant (RFP). Initially it was believed that the experience database developed by the Seismic Qualification Utility Group (SQUG) for commercial nuclear power plants, as outlined in their Generic Implementation Procedure (GIP), would provide a substantial benefit for the seismic adequacy verification of equipment at RFP. However, further review of the simplified guidelines contained in the GIP with respect to the specific RFP structures and components revealed substantial differences from the GIP criteria. Therefore, the number of ``outliers`` from the experience database defined in the GIP is greater than was initially anticipated. This paper presents details of the differences found between the RFP structures and components and those represented in the GIP, and the challenges presented for their evaluation at RFP. Approaches necessary to develop seismic verification data are also discussed. The discussions focus on experience with one of the nuclear facilities at RFP, Building 707. However, the conclusions are generally applicable to other similar facilities that typically comprise the RFP nuclear facilities.

Peregoy, W.; Herring, K.

1993-08-01T23:59:59.000Z

239

Universe Evolution in a 5D Ricci-flat Cosmology  

E-Print Network [OSTI]

We use Wetterich's parameterization equation of state (EOS) of dark energy to a $5D$ Ricci-flat cosmological solution and we suppose the universe contains three major components: matter, radiation and dark energy. By using the relation between the scale factor and the redshift $z$, we show that the two arbitrary functions contained in the $5D$ solution could be solved out analytically in terms of the variable $z$. Thus the whole $5D$ solution could be constructed uniquely if the current values of the three density parameters $\\Omega_{m0}$, ${\\Omega_{r0}}$, $\\Omega_{x0}$, the EOS $w_{0}$%, and the bending parameter $b$ contained in the EOS are all known. Furthermore, we find that all the evolutions of the mass density $\\Omega_{m} $, the radiation density ${\\Omega_{r}}$, the dark energy density $\\Omega_{x}$, and the deceleration parameter $q$ depend on the bending parameter $b$ sensitively. Therefore it is deserved to study observational constraints on the bending parameter $b$.

Chengwu Zhang; Hongya Liu; Lixin Xu; P. S. Wesson

2006-03-02T23:59:59.000Z

240

Environmental Survey preliminary report, Rocky Flats Plant, Golden, Colorado  

SciTech Connect (OSTI)

This report presents the preliminary findings of the Environmental Survey of the United States Department of Energy (DOE), Rocky Flats Plant (RFP), conducted August 11 through 22, 1986. The Survey is being conducted by an multidisciplinary team of environmental specialists, led and managed by the Office of Environment, Safety and Health's Office of Environmental Audit. Individual team members are outside experts supplied by a private contractor. The objective of the Survey is to identify environmental problems and areas of environmental risk associated with the RFP. The Survey covers all environmental media and all areas of environmental regulations. It is being performed in accordance with the DOE Environmental Survey Manual. The on-site phase of the Survey involves the review of existing site environmental data observations of the operations carried on at RFP, and interviews with site personnel. The Survey team developed a Sampling and Analysis Plan to assist in further assessing certain environmental problems identified during its on-site activates. The Sampling and Analysis Plan is being executed by DOE's Oak Ridge National Laboratory. When completed, the results will be incorporated into the RFP Environmental Survey Interim Report. The Interim Report will reflect the final determinations of the RFP Survey. 75 refs., 24 figs., 33 tabs.

Not Available

1987-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "flat column stars" 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

Technical Safety Appraisal of the Rocky Flats Plant  

SciTech Connect (OSTI)

This report provides the results of a Technical Safety Appraisal (TSA) of the Rocky Flats Plant (RFP) conducted November 14 to 18 and November 28 to December 9, 1988. This appraisal covered the effectiveness and improvements in the RFP safety program across the site, evaluating progress to date against standards of accepted practice. The appraisal included coverage of the timeliness and effectiveness of actions taken in response to the recommendations/concerns in three previous Technical Safety Appraisals (TSAs) of RFP Bldg. 707 conducted in July 1986, Bldgs. 771/774 conducted in October/November 1986, and Bldgs. 776/777 conducted in January/February 1988. Results of this appraisal are given in Section IV for each of 14 technical safety areas at RFP. These results include a discussion, conclusions and any new safety concerns for each technical safety area. Appendix A contains a description of the system for categorizing concerns, and the concerns are tabulated in Appendix B. Appendix C reports on the evaluation of the contractor's actions and the current status of each of the 230 recommendations and concerns contained in the three previous TSA reports.

Brown, Blake P.

1989-01-01T23:59:59.000Z

242

DISPOSITION PATHS FOR ROCKY FLATS GLOVEBOXES: EVALUATING OPTIONS  

SciTech Connect (OSTI)

The Kaiser-Hill Company, LLC has the responsibility for closure activities at the Rocky Flats Environmental Technology Site (RFETS). One of the challenges faced for closure is the disposition of radiologically contaminated gloveboxes. Evaluation of the disposition options for gloveboxes included a detailed analysis of available treatment capabilities, disposal facilities, and lifecycle costs. The Kaiser-Hill Company, LLC followed several processes in determining how the gloveboxes would be managed for disposition. Currently, multiple disposition paths have been chosen to accommodate the needs of the varying styles and conditions of the gloveboxes, meet the needs of the decommissioning team, and to best manage lifecycle costs. Several challenges associated with developing a disposition path that addresses both the radiological and RCRA concerns as well as offering the most cost-effective solution were encountered. These challenges included meeting the radiological waste acceptance criteria of available disposal facilities, making a RCRA determination, evaluating treatment options and costs, addressing void requirements associated with disposal, and identifying packaging and transportation options. The varying disposal facility requirements affected disposition choices. Facility conditions that impacted decisions included radiological and chemical waste acceptance criteria, physical requirements, and measurement for payment options. The facility requirements also impacted onsite activities including management strategies, decontamination activities, and life-cycle cost.

Lobdell, D.; Geimer, R.; Larsen, P.; Loveland, K.

2003-02-27T23:59:59.000Z

243

Control structure selection of a deethanizer column with partial condenser Proceedings of European Congress of Chemical Engineering (ECCE-6)  

E-Print Network [OSTI]

Control structure selection of a deethanizer column with partial condenser Proceedings of European of a deethanizer column with partial condenser A. Eduardo Shigueo Hori, B. Sigurd Skogestad Department of Chemical, it is studied the control structure selection of a deethanizer column with partial condenser. The column

Skogestad, Sigurd

244

Conceptual design for the STAR barrel electromagnetic calorimeter support rings  

SciTech Connect (OSTI)

The STAR electromagnetic calorimeter (EMC) will be used to measure the energy of photons and electrons from collisions of beams of particles in the RHIC accelerator under construction at Brookhaven National Laboratory. The present design is documented in the EMC Conceptual Design Report, and consists of a cylindrical barrel and two flat endcap calorimeter sections. The barrel EMC will consist of 120 modules, each subtending 6{degrees} in azimuthal angle about the beam ({phi}), and half the barrel length. Each module will be subdivided into ``towers`` of alternating scintillator and lead, which project to the nominal interaction point. There is a strong coupling between the designs for the EMC and for the conventional solenoidal magnet, which will be located immediately outside the barrel EMC. For example, the inner radius of the magnet must be minimized to lower costs and to reduce the STAR detector`s outer diameter to fit within constraints of the existing detector building. This condition requires the calorimeter modules to be just thick enough to accomplish physics goals and to support their weight with small deflections. This note describes progress in the design of the EMC support rings. Several ring designs and methods of construction have been considered. In addition, installation and alignment problems for both the rings and the rails have been considered in more depth. Finally, revised stress calculations for the recommended ring designs have been performed. Most of this work has been done in close collaboration with the STAR magnet subgroup.

Bielick, E.; Fornek, T.; Spinka, H.; Underwood, D.

1994-02-15T23:59:59.000Z

245

Influence of viscous friction heating on the efficiency of columns operated under very high pressures  

SciTech Connect (OSTI)

When columns packed with very fine particles are operated at high mobile phase velocities, the friction of the mobile phase percolating through the column bed generates heat. This heat dissipates along and across the column and axial and radial temperature gradients appear. The wall region of the column tends to be cooler than its center, and due to the influence of temperature on the mobile phase viscosity and on the equilibrium constant of analytes, the band velocity is not constant across the column. This radial heterogeneity of the temperature distribution across the column contributes to band broadening. This phenomenon was investigated assuming a cylindrically symmetrical column and using the general dispersion theory of Aris, which relates the height equivalent to the theoretical plate (HETP) contribution due to a radial heterogeneity of the column to the radial distribution of the linear velocities of a compound peak and to the radial distribution of its apparent dispersion coefficients in the column bed. The former is known from the temperature gradient across the column, the temperature dependencies of the mobile phase viscosity, and the retention factor of the compound. The latter is derived from the known expression of the transverse reduced HETP equation for the column. The values of the HETP calculated with the Aris model and a classical HETP equation were compared to those measured on a 2.1 x 50 mm Acquity BEH-C{sub 18} column, run at flow rates of 0.6, 0.95, 1.30, and 1.65 mL/min, with pure acetonitrile as the mobile phase and naphtho[2,3-a]pyrene as the retained compound. These two sets of data are in generally good agreement, although the experimental values of the HETP tend to increase faster with increasing mobile phase velocity than the calculated values.

Gritti, Fabrice [University of Tennessee, Knoxville (UTK); Guiochon, Georges A [ORNL

2009-01-01T23:59:59.000Z

246

Integrated Silica-Bead Separation Column for On-Chip LC-ESI  

E-Print Network [OSTI]

area as a 58µm ID capillary. ESI nozzle freestandingESI voltage is on, Cross Section Dimension Equivalent Column ID

He, Qing; Xie, Jun; Tai, Yu-Chong; Miao, Yunan; Lee, Terry D

2004-01-01T23:59:59.000Z

247

E-Print Network 3.0 - activated charcoal column Sample Search...  

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

for: activated charcoal column Page: << < 1 2 3 4 5 > >> 1 Renewable and Appropriate Energy Laboratory Report Review of Technologies for the Production and Use of Charcoal...

248

E-Print Network 3.0 - absorbing column densities Sample Search...  

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

John - National Radio Astronomy Observatory Collection: Physics 3 Characteristics and energy balance of a plasma column sustained by a surface wave Summary: density distribution...

249

E-Print Network 3.0 - affinity chromatography columns Sample...  

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

5 6 7 8 FEED RAFFINATE EXTRACT DESORBENT Single Column Chromatography Semba Octave... piston pumps, flow rates 0.05-10 mlmin Chromatography Module: includes valve block ......

250

Improved Design Tools for Surface Water and Standing Column Well Heat Pump Systems  

Broader source: Energy.gov [DOE]

This project will improve the capability of engineers to design heat pump systems that utilize surface water or standing column wells (SCW) as their heat sources and sinks.

251

E-Print Network 3.0 - anaerobic aquifer column Sample Search...  

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

Explorit Topic List Advanced Search Sample search results for: anaerobic aquifer column Page: << < 1 2 3 4 5 > >> 1 Biodegradation 11: 107116, 2000. 2001 Kluwer Academic...

252

A new warmstarting strategy for the primal-dual column generation ...  

E-Print Network [OSTI]

Jun 24, 2012 ... Abstract: This paper presents a new warmstarting technique in the context of a primal-dual column generation method applied to solve a ...

Jacek Gondzio

2012-06-24T23:59:59.000Z

253

Development of a Fuzzy Logic Controller for a Distillation Column using Rockwell Software .  

E-Print Network [OSTI]

??In this thesis, an alternative control method based on Fuzzy Inference System (FIS) is proposed to keep the product composition of a distillation column constant.… (more)

Nizami, Muhammad

2011-01-01T23:59:59.000Z

254

Simultaneous Column-and-Row Generation for Large-Scale Linear ...  

E-Print Network [OSTI]

Abstract: In this paper, we develop a simultaneous column-and-row generation algorithm ..... The last assumption does also hold because the linking constraint.

Birbil

2012-04-23T23:59:59.000Z

255

Testing and analysis of structural steel columns subjected to blast loads  

E-Print Network [OSTI]

to simulate a testing series on concrete masonry walls suchand testing for steel columns with a simplified boundary design of a concrete

Stewart, Lauren K.

2010-01-01T23:59:59.000Z

256

E-Print Network 3.0 - airlift bubble column Sample Search Results  

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

volumes of air bubbles into the water column, enhancing wave energy dissipation... The air entrainment coefficient cb determines how many ... Source: Kirby, James T. -...

257

Cosmic constraint on unified model of dark sectors in flat and non-flat varying gravitational constant theory  

E-Print Network [OSTI]

Observations indicate that most universal matter are invisible and gravitational constant $G(t)$ maybe depends on the time. The theory of variation of $G$ (VG) is explored in this paper, with naturally resulting to the invisible components in universe. We utilize the observational data: lookback time data, model-independent gamma ray bursts data, growth function of matter linear perturbations, type Ia supernovae data with systematic errors, cosmic microwave background, and baryon acoustic oscillation data from the radial scale measurement and the peak-positions measurement, to restrict the unified model (UM) of dark components in VG theory. Using the best-fit values of parameters with the covariance matrix, constraints on the variation of $G$ are $(\\frac{G}{G_{0}})_{z=3.5}\\simeq 1.0003^{+0.0014}_{-0.0016}$ and $(\\frac{\\dot{G}}{G})_{today}\\simeq 0.7977^{+2.3566}_{-2.3566}\\times 10^{-13} yr^{-1}$ in a flat geometry, the small uncertainties around constants. Limit on equation of state of dark matter is $w_{0dm}=...

Lu, Jianbo; Wu, Yabo; Xu, Lixin

2015-01-01T23:59:59.000Z

258

Technical safety appraisal: Buildings 776/777 Rocky Flats Plant  

SciTech Connect (OSTI)

Buildings 776/777 at the Rocky Flats Plant are major components of the production complex at the plant site. They have been in operation since 1957. The operations taking place in the buildings are nuclear weapons production support, processing of weapons assemblies returned from Pantex, waste processing, research and development in support of production, special projects, and those generated by support groups, such as maintenance. The appraisal team identified nine deficiencies that it believed required prompt attention. DOE management for EH, the program office (Defense Programs), and the field office analyzed the information provided by the appraisal team and instituted compensatory measures for closer monitoring of contractor activities by knowledgeable DOE staff and staff from other sites. Concurrently, the contractor was requested to address both short-term and long-term remedial measures to correct the identified issues as well as the underlying problems. The contractor has provided his action plan, which is included. This plan was under evaluation by EH and the DOE program office at the time this report was prepared. In addressing the major areas of concern identified above, a well as the specific deficiencies identified by the appraisal team, the contractor and the field office are cautioned to search for the root causes for the problems and to direct corrective actions to those root causes rather than solely to the symptoms to assure the sustainability of the improvements being made. The results of prior TSAs led DOE to conclude that previous corrective actions were not sufficient in that a large number of the individual findings are recurrent. Pending completion of remedial actions over the next few months, enhanced DOE oversight of the contractor is warranted.

Field, H C

1988-03-01T23:59:59.000Z

259

Star-planet magnetic interaction and evaporation of planetary atmospheres  

E-Print Network [OSTI]

Stars interact with their close-in planets through radiation, gravitation, and magnetic fields. We investigate the energy input to a planetary atmosphere by reconnection between stellar and planetary magnetic fields and compare it to the energy input of the extreme ultraviolet (EUV) radiation field of the star. We quantify the power released by magnetic reconnection at the boundary of the planetary magnetosphere that is conveyed to the atmosphere by accelerated electrons. We introduce simple models to evaluate the energy spectrum of the accelerated electrons and the energy dissipated in the atmospheric layers in the polar regions of the planet upon which they impinge. A simple transonic isothermal wind flow along field lines is considered to estimate the increase in mass loss rate in comparison with a planet irradiated only by the EUV flux of its host star. We find that energetic electrons can reach levels down to column densities of 10^{23}-10^{25} m^{-2}, comparable with or deeper than EUV photons, and incr...

Lanza, A F

2013-01-01T23:59:59.000Z

260

Formation of compressed flat electron beams with high transverse-emittance ratios  

SciTech Connect (OSTI)

Flat beams—beams with asymmetric transverse emittances—have important applications in novel light-source concepts and advanced-acceleration schemes and could possibly alleviate the need for damping rings in lepton colliders. Over the last decade, a flat beam generation technique based on the conversion of an angular-momentum-dominated beam was proposed and experimentally tested. In this paper we explore the production of compressed flat beams. We especially investigate and optimize the flat beam transformation for beams with substantial fractional energy spread. We use as a simulation example the photoinjector of Fermilab’s Advanced Superconducting Test Accelerator. The optimizations of the flat beam generation and compression at Advanced Superconducting Test Accelerator were done via start-to-end numerical simulations for bunch charges of 3.2 nC, 1.0 nC, and 20 pC at ?37??MeV. The optimized emittances of flat beams with different bunch charges were found to be 0.25???m (emittance ratio is ?400), 0.13????m, 15 nm before compression, and 0.41???m, 0.20???m, 16 nm after full compression, respectively, with peak currents as high as 5.5 kA for a 3.2?nC flat beam. These parameters are consistent with requirements needed to excite wakefields in asymmetric dielectric-lined waveguides or produce significant photon flux using small-gap micro-undulators.

Zhu, J. [Fermilab; Institute of Fluid Physics, CAEP, China; Piot, P. [Northern Illinois University; Fermilab; Mihalcea, D. [Northern Illinois University; Prokop, C. R. [Northern Illinois University

2014-08-01T23:59:59.000Z

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


261

DUST EXTINCTION BIAS IN THE COLUMN DENSITY DISTRIBUTION OF GAMMA-RAY BURSTS: HIGH COLUMN DENSITY, LOW-REDSHIFT GRBs ARE MORE HEAVILY OBSCURED  

SciTech Connect (OSTI)

The afterglows of gamma-ray bursts (GRBs) have more soft-X-ray absorption than expected from the foreground gas column in the Galaxy. While the redshift of the absorption can in general not be constrained from current X-ray observations, it has been assumed that the absorption is due to metals in the host galaxy of the GRB. The large sample of X-ray afterglows and redshifts now available allows the construction of statistically meaningful distributions of the metal column densities. We construct such a sample and show, as found in previous studies, that the typical absorbing column density (N{sub H{sub X}}) increases substantially with redshift, with few high column density objects found at low-to-moderate redshifts. We show, however, that when highly extinguished bursts are included in the sample, using redshifts from their host galaxies, high column density sources are also found at low-to-moderate redshift. We infer from individual objects in the sample and from observations of blazars that the increase in column density with redshift is unlikely to be related to metals in the intergalactic medium or intervening absorbers. Instead we show that the origin of the apparent increase with redshift is primarily due to dust extinction bias: GRBs with high X-ray absorption column densities found at z {approx}< 4 typically have very high dust extinction column densities, while those found at the highest redshifts do not. It is unclear how such a strongly evolving N{sub H{sub X}}/A{sub V} ratio would arise, and based on current data, remains a puzzle.

Watson, Darach [Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen O (Denmark); Jakobsson, Pall, E-mail: darach@dark-cosmology.dk, E-mail: pja@raunvis.hi.is [Centre for Astrophysics and Cosmology, Science Institute, University of Iceland, Dunhaga 5, IS-107 Reykjavik (Iceland)

2012-08-01T23:59:59.000Z

262

COMPUTATIONAL AND EXPERIMENTAL MODELING OF SLURRY BUBBLE COLUMN REACTORS  

SciTech Connect (OSTI)

This project is a collaborative effort between the University of Akron, Illinois Institute of Technology and two industries: UOP and Energy International. The tasks involve the development of transient two and three dimensional computer codes for slurry bubble column reactors, optimization, comparison to data, and measurement of input parameters, such as the viscosity and restitution coefficients. To understand turbulence, measurements were done in the riser with 530 micron glass beads using a PIV technique. This report summarizes the measurements and simulations completed as described in details in the attached paper, ''Computational and Experimental Modeling of Three-Phase Slurry-Bubble Column Reactor.'' The Particle Image Velocimetry method described elsewhere (Gidaspow and Huilin, 1996) was used to measure the axial and tangential velocities of the particles. This method was modified with the use of a rotating colored transparent disk. The velocity distributions obtained with this method shows that the distribution is close to Maxwellian. From the velocity measurements the normal and the shear stresses were computed. Also with the use of the CCD camera a technique was developed to measure the solids volume fraction. The granular temperature profile follows the solids volume fraction profile. As predicted by theory, the granular temperature is highest at the center of the tube. The normal stress in the direction of the flow is approximately 10 times larger than that in the tangential direction. The <{nu}{prime}{sub z}{nu}{prime}{sub z}> is lower at the center where the <{nu}{prime}{sub {theta}}{nu}{prime}{sub {theta}}> is higher at that point. The Reynolds shear stress was small, producing a restitution coefficient near unity. The normal Reynolds stress in the direction of flow is large due to the fact that it is produced by the large gradient of velocity in the direction of flow compared to the small gradient in the {theta} and r directions. The kinetic theory gives values of viscosity that agree with our previous measurements (Gidaspow, Wu and Mostofi, 1999). The values of viscosity obtained from pressure drop minus weight of bed measurements agree at the center of the tube.

Paul Lam; Dimitri Gidaspow

2001-08-01T23:59:59.000Z

263

ENERGY STAR Webinar: Financing Energy Efficient Upgrades with...  

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

ENERGY STAR Webinar: Financing Energy Efficient Upgrades with ENERGY STAR ENERGY STAR Webinar: Financing Energy Efficient Upgrades with ENERGY STAR October 21, 2014 2:00PM to...

264

ENERGY STAR Webinar: Financing Energy Efficient Upgrades with ENERGY STAR  

Broader source: Energy.gov [DOE]

Hosted by ENERGY STAR, this webinar will show how public sector organizations are improving energy efficiency with innovative solutions to financial barriers.

265

An experimental investigation of certain flat plates loaded in torsion with end restraint  

E-Print Network [OSTI]

and deflections of flat plates loaded in torsion are oonsidered. Plates of width-Chiohess ratios of 8, 10, 12 and 14 and length- width ratios of 1, 2 ~ 4 and 6 are used Theoretical and expsrinental stress and defleotion ourves are plottedi Sartloular... require high struotural solidities. Ls a result a flat plate nay be used to sienlate wing struotural problens ~ 1 Theoretioal solutions ~ ~ for the stresses and defleotions of flat plates with torsional loads ellninate the effeots of end restraint by as...

Hamner, Bennett Barron

1953-01-01T23:59:59.000Z

266

Radio Sources in Low-Luminosity Active Galactic Nuclei. I. VLA Detections of Compact, Flat-Spectrum Cores  

E-Print Network [OSTI]

We report a 0.2" resolution, 15 GHz survey of a sample of 48 low-luminosity active galactic nuclei with the Very Large Array. Compact radio emission has been detected in 57% (17 of 30) of LINERs and low-luminosity Seyferts, at least 15 of which have a flat to inverted radio spectrum (alpha > -0.3). The compact radio cores are found in both type 1 (i.e. with broad Halpha) and type 2 (without broad Halpha) nuclei. The 2 cm radio power is significantly correlated with the emission-line ([OI] lambda6300) luminosity. While the present observations are consistent with the radio emission originating in star-forming regions, higher resolution radio observations of 10 of the detected sources, reported in a companion paper (Falcke et al. 2000), show that the cores are very compact (= 10^8K) and probably synchrotron self-absorbed, ruling out a starburst origin. Thus, our results suggest that at least 50% of low-luminosity Seyferts and LINERs in the sample are accretion powered, with the radio emission presumably coming from jets or advection-dominated accretion flows. We have detected only 1 of 18 `transition' (i.e. LINER + HII) nuclei observed, indicating their radio cores are significantly weaker than those of `pure' LINERs.

Neil M. Nagar; Heino Falcke; Andrew S. Wilson; Luis C. Ho

2000-05-18T23:59:59.000Z

267

New Abundansec From Very Old Stars  

E-Print Network [OSTI]

Metal-poor stars hold the fossil record of the Galactic chemical evolution and nucleosynthesis processes that took place at the earliest times in the history of our Galaxy. From detailed abundance studies of low mass, extremely metal-poor stars ([Fe/H] capture. The sample includes some of the most metal-poor stars ([Fe/H] capture elements, and also a number of stars enhanced in carbon. The so called CEMP (carbon enhanced metal-poor) stars, these stars make up ~20% of the stars with [Fe/H] < -3, and 80% of the stars with [Fe/H] < -4.5. The progenitors of CEMP stars is still ...

Hansen, T; Christlieb, N; Yong, D; Beers, T C; Andersen, J

2015-01-01T23:59:59.000Z

268

Validation of Ozone Monitoring Instrument nitrogen dioxide columns E. A. Celarier,1  

E-Print Network [OSTI]

Validation of Ozone Monitoring Instrument nitrogen dioxide columns E. A. Celarier,1 E. J. Brinksma the standard nitrogen dioxide (NO2) data product (Version 1.0.), which is based on measurements made), Validation of Ozone Monitoring Instrument nitrogen dioxide columns, J. Geophys. Res., 113, D15S15, doi:10

269

Minimum Energy Consumption in Multicomponent Distillation. 1. Vmin Diagram for a Two-Product Column  

E-Print Network [OSTI]

Minimum Energy Consumption in Multicomponent Distillation. 1. Vmin Diagram for a Two-Product Column how the minimum energy consumption is related to the feed-component distribution for all possible operating points in a two-product distillation column with a multicomponent feed. The classical Underwood

Skogestad, Sigurd

270

Chromate transport through columns packed with surfactant-modified zeolite/zero valent iron pellets  

E-Print Network [OSTI]

Chromate transport through columns packed with surfactant-modified zeolite/zero valent iron pellets Chromate transport through columns packed with zeolite/zero valent iron (Z/ZVI) pellets, either untreated originated from chromate sorption onto the HDTMA modified Z/ZVI pellets. Due to dual porosity, the presence

Li, Zhaohui

271

JOURNAL OF STRUCTURAL ENGINEERING / OCTOBER 2000 / 1113 SEISMIC RESPONSE OF EXTERIOR RC COLUMN-TO-STEEL  

E-Print Network [OSTI]

JOURNAL OF STRUCTURAL ENGINEERING / OCTOBER 2000 / 1113 SEISMIC RESPONSE OF EXTERIOR RC COLUMN-TO-STEEL: The inelastic cyclic response of hybrid connections consisting of RC columns and steel beams (RCS) is studied of the steel beams, steel band plates or cover plates surrounding the joint region, steel fiber concrete

Parra-Montesinos, Gustavo J.

272

Simultaneous retrievals of column ozone and aerosol optical properties from direct and diffuse solar irradiance measurements  

E-Print Network [OSTI]

of column ozone and aerosol optical properties from direct and diffuse solar irradiance measurements, JSimultaneous retrievals of column ozone and aerosol optical properties from direct and diffuse solar irradiance measurements Christian D. Goering,1 Tristan S. L'Ecuyer,1 Graeme L. Stephens,1 James R

Stephens, Graeme L.

273

Weak-Axis Behavior of Wide Flange Columns Subjected to Blast  

E-Print Network [OSTI]

the effect of blast loading on wide flange columns loaded perpendicular to the weak axis of bending field detonations. Furthermore, past studies investigating the effect of blast load- ing on wide flangeWeak-Axis Behavior of Wide Flange Columns Subjected to Blast Nagarjun Krishnappa1 ; Michel Bruneau

Bruneau, Michel

274

Cyclotron waves in a non-neutral plasma column Daniel H. E. Dubin  

E-Print Network [OSTI]

plasma column with near-Maxwellian velocity distributions. We focus on the z-independent componentCyclotron waves in a non-neutral plasma column Daniel H. E. Dubin Citation: Phys. Plasmas 20. Additional information on Phys. Plasmas Journal Homepage: http://pop.aip.org/ Journal Information: http

California at San Diego, University of

275

Cyclotron Waves in a Nonneutral Plasma Column Daniel H.E. Dubin  

E-Print Network [OSTI]

plasma column with near-Maxwellian velocity distributions. We focus on the z-independent componentCyclotron Waves in a Nonneutral Plasma Column Daniel H.E. Dubin Department of Physics, University of California at San Diego, La Jolla, California 92093 (Dated: February 22, 2013 [submitted to Phys. Plasmas

California at San Diego, University of

276

Cyclotron waves in a non-neutral plasma column Daniel H. E. Dubin  

E-Print Network [OSTI]

plasma column with near-Maxwellian velocity distributions. We focus on the z-independent component#12;Cyclotron waves in a non-neutral plasma column Daniel H. E. Dubin Department of Physics April 2013; published online 25 April 2013) A kinetic theory of linear electrostatic plasma waves

California at San Diego, University of

277

Active Vapor Split Control for Dividing-Wall Columns Deeptanshu Dwivedi,  

E-Print Network [OSTI]

, Norway ABSTRACT: Dividing-wall distillation columns offer large potential energy savings over the energy requirements. INTRODUCTION Dividing-wall distillation columns such as Petlyuk arrangements, where the vapor fraction or degree of subcooling in the feed is varied to achieve optimum operation.13

Skogestad, Sigurd

278

PRIMARY RESEARCH PAPER Water column oxygen demand and sediment oxygen flux  

E-Print Network [OSTI]

PRIMARY RESEARCH PAPER Water column oxygen demand and sediment oxygen flux: patterns of oxygen dissolved oxygen (DO) levels often occur during summer in tidal creeks along the southeastern coast of the USA. We analyzed rates of oxygen loss as water-column biochemical oxygen demand (BOD5) and sediment

Mallin, Michael

279

E-Print Network 3.0 - argon plasma column Sample Search Results  

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

surface wave produced plasma column obtained at 40 mtorr of argon in a 25 mm i.d. pyrex tube... shows the plasma column obtained at 40 mtorr of argon in a 25 mm i.d. tube with 80 W...

280

Model predictive control of a pilot-scale distillation column using a programmable automation controller  

E-Print Network [OSTI]

Model predictive control of a pilot-scale distillation column using a programmable automation). The controller is tested on a pilot-scale binary distillation column to track reference temperatures. A majorRIO) to control a pilot-scale binary distillation col- umn. Both the PI-controllers and the supervising online MPC

Note: This page contains sample records for the topic "flat column stars" 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 POWER SUPPLY SYSTEM FOR THE ACCELERATING COLUMN OF THE 2 MEV ELECTRON COOLER FOR COSY  

E-Print Network [OSTI]

a high-energy electron beam. The power supply for the accelerating column of the electron cooling systemTHE POWER SUPPLY SYSTEM FOR THE ACCELERATING COLUMN OF THE 2 MEV ELECTRON COOLER FOR COSY D controlled voltage source for 60 kV, 1mA and an additional supply for the solenoids of the magnetic system

Kozak, Victor R.

282

Using observations of deep convective systems to constrain atmospheric column absorption of solar radiation in the  

E-Print Network [OSTI]

column absorption of solar radiation (Acol) is a fundamental part of the Earth's energy cycle.e., the Acol values at both regions converge to the same value ($0.27 of the total incoming solar radiation to constrain atmospheric column absorption of solar radiation in the optically thick limit, J. Geophys. Res

Dong, Xiquan

283

Light-scattering properties of plate and column ice crystals generated in a laboratory cold chamber  

E-Print Network [OSTI]

with a diode laser beam. This cloud chamber produces distinct plate and hollow column ice crystal types. The cloud chamber developed at the Desert Re- search Institute has been used to produce ice clouds composedLight-scattering properties of plate and column ice crystals generated in a laboratory cold chamber

Liou, K. N.

284

A dusty plasma device for producing extended, steady state, magnetized, dusty plasma columns  

E-Print Network [OSTI]

A dusty plasma device for producing extended, steady state, magnetized, dusty plasma columns Wenjun with an existing Q machine, to produce extended, steady state, magnetized plasma columns. The dusty plasma device (DPD) is to be used for the investigation of waves in dusty plasmas and of other plasma/dust aspects

Merlino, Robert L.

285

Griffith 4/2004 Small Scale His Tag Enzyme Purification with TALON Affinity Column Resin  

E-Print Network [OSTI]

Griffith 4/2004 Small Scale His Tag Enzyme Purification with TALON Affinity Column Resin Overview: This is a small scale method for purifying a His-tagged protein using commercial affinity resin. Materials: TALON rotor, at 18 K rpm) at 4 °C. 7. Save supernatant fraction for column purification. Supernatant can

Doering, Tamara

286

Evaluation of Vitrification Processing Step for Rocky Flats Incinerator Ash  

SciTech Connect (OSTI)

In 1997, Pacific Northwest National Laboratory (PNNL) staff developed a processing option for incinerator ash at the Rocky Flats Environmental Technology Sites (RFETS). This work was performed with support from Los Alamos National Laboratory (LANL) and Safe Sites of Colorado (SSOC). A description of the remediation needs for the RFETS incinerator ash is provided in a report summarizing the recommended processing option for treatment of the ash (Lucy et al. 1998). The recommended process flowsheet involves a calcination pretreatment step to remove carbonaceous material followed by a vitrification processing step for a mixture of glass tit and calcined incinerator ash. Using the calcination pretreatment step to remove carbonaceous material reduced process upsets for the vitrification step, allowed for increased waste loading in the final product, and improved the quality of the final product. Figure 1.1 illustrates the flow sheet for the recommended processing option for treatment of RFETS incinerator ash. In 1998, work at PNNL further developed the recommended flow sheet through a series of studies to better define the vitrification operating parameters and to address secondary processing issues (such as characterizing the offgas species from the calcination process). Because a prototypical rotary calciner was not available for use, studies to evaluate the offgas from the calcination process were performed using a benchtop rotary calciner and laboratory-scale equipment (Lucy et al. 1998). This report focuses on the vitrification process step after ash has been calcined. Testing with full-scale containers was performed using ash surrogates and a muffle furnace similar to that planned for use at RFETS. Small-scale testing was performed using plutonium-bearing incinerator ash to verify performance of the waste form. Ash was not obtained from RFETS because of transportation requirements to calcine the incinerator ash prior to shipment of the material. Because part of PNNL's work was to characterize the ash prior to calcination and to investigate the effect of calcination on product quality, representative material was obtained from LANL. Ash obtained from LANL was selected based on its similarity to that currently stored at RFETS. The plutonium-bearing ashes obtained from LANL are likely from a RFETS incinerator, but the exact origin was not identified.

Wigent, W.L.; Luey, J.K.; Scheele, R.D.; Li, H.

1999-04-08T23:59:59.000Z

287

Streamlining ENERGY STAR Appliance Testing  

Broader source: Energy.gov [DOE]

To save taxpayer dollars and help lower the costs of innovative energy-efficient technologies, the Energy Department is streamlining ENERGY STAR testing for appliances.

288

Home Performance with Energy Star  

Broader source: Energy.gov [DOE]

Through the Home Performance with Energy Star program, Focus on Energy offers instant rewards for installing select recommended efficiency measures following a home energy audit. Energy consultants...

289

Excavation of the first stars  

E-Print Network [OSTI]

The external pollution of the first stars in the Galaxy is investigated. The first stars were born in clouds composed of the pristine gas without heavy elements. These stars accreted gas polluted with heavy elements while they still remained in the cloud. As a result, it is found that they exhibit a distribution with respect to the surface metallicity. We have derived the actual form of this distribution function. This metallicity distribution function strongly suggests that the recently discovered most metal-deficient star HE0107-5240 with [Fe/H]=-5.3 was born as a metal-free star and accreted gas polluted with heavy elements. Thus the heavy elements such as Fe in HE0107-5240 must have been supplied from supernovae of later generations exploding inside the cloud in which the star had been formed. The elemental abundance pattern on the surface of stars suffering from such an external pollution should not be diverse but exhibit the average pattern of numerous supernovae. Future observations for a number of metal-deficient stars with [Fe/H]<-5 will be able to prove or disprove this external pollution scenario. Other possibilities to produce a star with this metallicity are also discussed.

Toshikazu Shigeyama; Takuji Tsujimoto; Yuzuru Yoshii

2003-02-17T23:59:59.000Z

290

Creating a Star on Earth  

Broader source: Energy.gov [DOE]

At the Energy Department's Princeton Plasma Physics Lab, scientists are trying to accomplish what was once considered the realm of science fiction: creating a star on Earth.

291

Star Formation Activity in the Long, Filamentary Infrared Dark Cloud G53.2  

E-Print Network [OSTI]

We present star formation activity in the infrared dark cloud (IRDC) G53.2, a remarkable IRDC located at Galactic coordinates $(l,b)\\sim(53^{\\circ}.2,\\,0^{\\circ}.0)$ based on the census of young stellar object (YSO) candidates. IRDC G53.2 was previously identified as several IRDCs in mid-IR images, but it is in fact a long ($\\gtrsim$45 pc) cloud, well consistent with a CO cloud at $v\\sim23$ \\kms\\ (or at $d\\sim$1.7 kpc). We present a point-source catalog of IRDC G53.2 that contains $\\sim$370 sources from our photometry of the {\\it Spitzer} MIPS 24 \\um\\ data and Galactic Legacy Infrared Mid-Plane Survey Extraordinaire Catalog. The classification of the identified sources based on their spectral index and control field analysis to remove field star contamination reveals that IRDC G53.2 is an active star-forming region with $\\sim$300 YSO candidates. We compare the YSO classification based on spectral index, mid-IR colors, and the wavelength range used, which results in consistent classification, except for flat-s...

Kim, Hyun-Jeong; Davis, Christopher J

2015-01-01T23:59:59.000Z

292

Experimental Investigations of Vortex Induced Vibration of A Flat Plate in Pitch Oscillation  

E-Print Network [OSTI]

A bluff structure placed in a flowing fluid, may be subjected to vortex-induced vibrations (VIV). For a flat plate with only rotational degree of freedom, the VIV is rotational oscillation. Based on the experimental investigation, vortex...

Yang, Yi

2012-02-14T23:59:59.000Z

293

Conformally flat Einstein-Yang-Mills-Higgs solutions with spherical symmetry  

SciTech Connect (OSTI)

We solve the Einstein-Yang-Mills-Higgs equations in a conformally flat metric with spherical symmetry. Two solutions are obtained corresponding to magnetic monopoles in the Higgs vacuum and outside of it.

Mondaini, R.P.; Santos, N.O.

1983-10-15T23:59:59.000Z

294

Flat Quartz-Crystal X-ray Spectrometer for Nuclear Forensics Applications  

E-Print Network [OSTI]

structure. The higher energy background radiation was blocked from reaching the detector using a customized collimator and shielding system. A flat quartz-crystal x-ray spectrometer system was designed specifically to fit the constraints and requirements...

Goodsell, Alison

2012-10-19T23:59:59.000Z

295

Comparison and evaluation of turbulence estimation schemes at Rocky Flats Plant  

SciTech Connect (OSTI)

The Rocky Flats Plant (RFP) routinely measures meteorological data to support Air Quality and Emergency Response activities. These data help to characterize the transport and dispersion of actual or potential airborne releases of radionuclides or other hazardous materials.

Bowen, B.M.; Pamp, S.E.

1993-10-01T23:59:59.000Z

296

VWZ-0008- In the Matter of EG&G Rocky Flats, Inc.  

Broader source: Energy.gov [DOE]

This decision will consider a Motion for Partial Dismissal and Limitation on Scope of Complainant's Claims filed by EG&G Rocky Flats, Inc. (EG&G) on June 13, 1997. In its motion, EG&G...

297

EA-1146: Radioactive Waste Storage at Rocky Flats Environmental Technology Site, Golden, Colorado  

Broader source: Energy.gov [DOE]

This EA evaluates the environmental impacts of the proposal to convert buildings at the U.S. Department of Energy Rocky Flats Environmental Technology Site from their former uses to interim waste...

298

Methods of improving the surface flatness of thin glass sheets and silicon wafers  

E-Print Network [OSTI]

The manufacturing of high quality sheet glass has allowed for many technologies to advance to astonishing frontiers. With dimensions reaching ~ 3 x 3 m˛, sheet glass is pushing the envelope for producing massive size flat ...

Akilian, Mireille

2008-01-01T23:59:59.000Z

299

Seismic fragility and retrofitting for a reinforced concrete flat-slab structure  

E-Print Network [OSTI]

The effectiveness of seismic retrofitting applied to enhance seismic performance was assessed for a five-story reinforced concrete (RC) flat-slab building structure in the central United States. In addition to this, an assessment of seismic...

Bai, Jong-Wha

2004-09-30T23:59:59.000Z

300

DOE's Rocky Flats Cleanup Site Named 2006 Project of the Year...  

Office of Environmental Management (EM)

U.S. Department of Energy (DOE) today announced that the Project Management Institute (PMI) has awarded its 2006 Project of the Year to DOE's Rocky Flats Environmental Technology...

Note: This page contains sample records for the topic "flat column stars" 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

Design of Flat-Plate Dehumidifiers for Humidification–Dehumidification Desalination Systems  

E-Print Network [OSTI]

Flat-plate heat exchangers are examined for use as dehumidifiers in humidification–dehumidification (HDH) desalination systems. The temperature and humidity ratio differences that drive mass transfer are considerably higher ...

Sievers, Martin

302

RHIC | STAR Detector  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLas ConchasPassive Solar HomePromising Science for1 20115, 2001 MediaBrookhavenBlackAThe STAR

303

Star Canticle Issue 2  

E-Print Network [OSTI]

StA ft CANtJClt 2 * 1 1 STAR CANTICLE 2 DOTTY BARRY PRICE: P.O. BOX 921 $5.50 1st class CLAREMONT, CA 91711 4.50 book rate CON TEN TS 2 Prelude 3 Poetry ?Untitled Dotty Barry k Fiction ?"Scotty? s Decision" Joy Mancinelli 6.... .Poetry..." Rayelle Roe m Poetry ?"Shouldn't You Ask Me First?" .Susan Meek k>2 Poetry ?"Storm Haven" Ellen Kobrin ^3 Poetry ?"Fire and Ice" ? ? .Gerry Downes kk Fiction ?"Viewpoint" Kay McElvain ty Poetry ?"Threads" Susan Burr 48 Poetry ?"The Starless Sky" Liz...

Multiple Contributors

1979-01-01T23:59:59.000Z

304

A Corona Australis cloud filament seen in NIR scattered light I. Comparison with extinction of background stars  

E-Print Network [OSTI]

With current near-infrared (NIR) instruments the near-infrared light scattered from interstellar clouds can be mapped over large areas. The surface brightness carries information on the line-of-sight dust column density. Therefore, scattered light could provide an important tool to study mass distribution in quiescent interstellar clouds at a high, even sub-arcsecond resolution. We wish to confirm the assumption that light scattering dominates the surface brightness in all NIR bands. Furthermore, we want to show that scattered light can be used for an accurate estimation of dust column densities in clouds with Av in the range 1-15mag. We have obtained NIR images of a quiescent filament in the Corona Australis molecular cloud. The observations provide maps of diffuse surface brightness in J, H, and Ks bands. Using the assumption that signal is caused by scattered light we convert surface brightness data into a map of dust column density. The same observations provide colour excesses for a large number of background stars. These data are used to derive an extinction map of the cloud. The two, largely independent tracers of the cloud structure are compared. Results. In regions below Av=15m both diffuse surface brightness and background stars lead to similar column density estimates. The existing differences can be explained as a result of normal observational errors and bias in the sampling of extinctions provided by the background stars. There is no indication that thermal dust emission would have a significant contribution even in the Ks band. The results show that, below Av=15mag, scattered light does provide a reliable way to map cloud structure. Compared with the use of background stars it can also in practice provide a significantly higher spatial resolution.

M. Juvela; V. -M. Pelkonen; P. Padoan; K. Mattila

2008-01-09T23:59:59.000Z

305

Cavitation from bulk viscosity in neutron stars and quark stars  

E-Print Network [OSTI]

The bulk viscosity in quark matter is sufficiently high to reduce the effective pressure below the corresponding vapor pressure during density perturbations in neutron stars and strange stars. This leads to mechanical instability where the quark matter breaks apart into fragments comparable to cavitation scenarios discussed for ultra-relativistic heavy-ion collisions. Similar phenomena may take place in kaon-condensed stellar cores. Possible applications to compact star phenomenology include a new mechanism for damping oscillations and instabilities, triggering of phase transitions, changes in gravitational wave signatures of binary star inspiral, and astrophysical formation of strangelets. At a more fundamental level it points to the possible inadequacy of a hydrodynamical treatment of these processes in compact stars.

Jes Madsen

2009-09-30T23:59:59.000Z

306

Idaho National Engineering Laboratory code assessment of the Rocky Flats transuranic waste  

SciTech Connect (OSTI)

This report is an assessment of the content codes associated with transuranic waste shipped from the Rocky Flats Plant in Golden, Colorado, to INEL. The primary objective of this document is to characterize and describe the transuranic wastes shipped to INEL from Rocky Flats by item description code (IDC). This information will aid INEL in determining if the waste meets the waste acceptance criteria (WAC) of the Waste Isolation Pilot Plant (WIPP). The waste covered by this content code assessment was shipped from Rocky Flats between 1985 and 1989. These years coincide with the dates for information available in the Rocky Flats Solid Waste Information Management System (SWIMS). The majority of waste shipped during this time was certified to the existing WIPP WAC. This waste is referred to as precertified waste. Reassessment of these precertified waste containers is necessary because of changes in the WIPP WAC. To accomplish this assessment, the analytical and process knowledge available on the various IDCs used at Rocky Flats were evaluated. Rocky Flats sources for this information include employee interviews, SWIMS, Transuranic Waste Certification Program, Transuranic Waste Inspection Procedure, Backlog Waste Baseline Books, WIPP Experimental Waste Characterization Program (headspace analysis), and other related documents, procedures, and programs. Summaries are provided of: (a) certification information, (b) waste description, (c) generation source, (d) recovery method, (e) waste packaging and handling information, (f) container preparation information, (g) assay information, (h) inspection information, (i) analytical data, and (j) RCRA characterization.

NONE

1995-07-01T23:59:59.000Z

307

The Inverted Block Rate:The Inverted Block Rate: An Alternative to Flat Rate BillingAn Alternative to Flat Rate Billing  

E-Print Network [OSTI]

The Inverted Block Rate:The Inverted Block Rate: An Alternative to Flat Rate BillingAn Alternative;Inverted Block RateInverted Block Rate 22 IntroductionIntroduction ·· Modern societies rely on electrical collectionMetering and Rate Models facilitate collection #12;Inverted Block RateInverted Block Rate 33 Rate

Hughes, Larry

308

Heat Transfer -2 A heat generating ( ) flat plate fuel element of thickness 2L is covered with flat plate steel cladding of  

E-Print Network [OSTI]

with flat plate steel cladding of thickness b. The heat generated is removed by a fluid at T, which adjoins on both sides On the sketch show regions where dT/dx is zero, constant and increasing. T , h x LL bb SteelSteel

Virginia Tech

309

Physics of Neutron Star Crusts  

E-Print Network [OSTI]

The physics of neutron star crusts is vast, involving many different research fields, from nuclear and condensed matter physics to general relativity. This review summarizes the progress, which has been achieved over the last few years, in modeling neutron star crusts, both at the microscopic and macroscopic levels. The confrontation of these theoretical models with observations is also briefly discussed.

N. Chamel; P. Haensel

2008-12-20T23:59:59.000Z

310

On the origin of ionising photons emitted by T Tauri stars  

E-Print Network [OSTI]

We address the issue of the production of Lyman continuum photons by T Tauri stars, in an attempt to provide constraints on theoretical models of disc photoionisation. By treating the accretion shock as a hotspot on the stellar surface we show that Lyman continuum photons are produced at a rate approximately three orders of magnitude lower than that produced by a corresponding black body, and that a strong Lyman continuum is only emitted for high mass accretion rates. When our models are extended to include a column of material accreting on to the hotspot we find that the accretion column is extremely optically thick to Lyman continuum photons. Further, we find that radiative recombination of hydrogen atoms within the column is not an efficient means of producing photons with energies greater than 13.6eV, and find that an accretion column of any conceivable height suppresses the emission of Lyman continuum photons to a level below or comparable to that expected from the stellar photosphere. The photospheric Lyman continuum is itself much too weak to affect disc evolution significantly, and we find that the Lyman continuum emitted by an accretion shock is similarly unable to influence disc evolution significantly. This result has important consequences for models which use photoionisation as a mechanism to drive the dispersal of circumstellar discs, essentially proving that an additional source of Lyman continuum photons must exist if disc photoionisation is to be significant.

R. D. Alexander; C. J. Clarke; J. E. Pringle

2003-11-12T23:59:59.000Z

311

Verifying the ENERGY STAR® Certification Application  

Broader source: Energy.gov [DOE]

Do you verify commercial building applications for ENERGY STAR certification? This webinar, based on the ENERGY STAR Guide for Licensed Professionals, covers the role of the licensed professional,...

312

EVIDENCE OF CONTRIBUTION OF INTERVENING CLOUDS TO GAMMA-RAY BURST'S X-RAY COLUMN DENSITY  

SciTech Connect (OSTI)

The origin of excess of X-ray column density with respect to optical extinction in gamma-ray bursts (GRBs) is still a puzzle. A proposed explanation of the excess is the photoelectric absorption due to the intervening clouds along a GRB's line of sight. Here, we test this scenario by using the intervening Mg II absorption as a tracer of the neutral hydrogen column density of the intervening clouds. We identify a connection between the large X-ray column density (and large column density ratio of log (N{sub H,X}/N{sub H{sub I}})?0.5) and large neutral hydrogen column density probed by the Mg II doublet ratio (DR). In addition, GRBs with large X-ray column density (and large ratio of log (N{sub H,X}/N{sub H{sub I}})>0) tend to have multiple saturated intervening absorbers with DR < 1.2. These results therefore indicate an additional contribution from the intervening system to the observed X-ray column density in some GRBs, although the contribution from the host galaxy alone cannot be excluded based on this study.

Wang, J., E-mail: wj@bao.ac.cn [National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China)

2013-10-20T23:59:59.000Z

313

Efficiencies of Low-Mass Star and Star Cluster Formation  

E-Print Network [OSTI]

Using a quantitative model for bipolar outflows driven by hydromagnetic protostellar winds, we calculate the efficiency of star formation assuming that available gas is either converted into stars or ejected in outflows. We estimate the efficiency of a single star formation event in a protostellar core, finding 25%-70% for cores with various possible degrees of flattening. The core mass function and the stellar initial mass function have similar slopes, because the efficiency is not sensitive to its parameters. We then consider the disruption of gas from a dense molecular clump in which a cluster of young stars is being born. In both cases, we present analytical formulae for the efficiencies that compare favorably against observations and, for clusters, against numerical simulations. We predict efficiencies in the range 30%-50% for the regions that form clusters of low-mass stars. In our model, star formation and gas dispersal happen concurrently. We neglect the destructive effects of massive stars: our results are therefore upper limits to the efficiency in regions more massive than about 3000 Msun.

Christopher D. Matzner; Christopher F. McKee

2000-07-25T23:59:59.000Z

314

Analytical and Experimental Assessment of Seismic Vulnerability of Beam-Column Joints without Transverse Reinforcement in Concrete Buildings  

E-Print Network [OSTI]

of the upper block of the beam-column joint subassemblybeam-column joints. The third block of this research is theand corner joints. The second building block in the current

Hassan, Wael M.

2011-01-01T23:59:59.000Z

315

Dynamic behavior of chemical exchange column in a water detritiation system for a fusion reactor  

SciTech Connect (OSTI)

The dynamic behavior of a CECE column used for a demonstration reactor (DEMO) plant has been studied. In the case where the column was filled with natural water, the time required to achieve steady state was almost the same as that for the column operated under the total reflux mode. The manipulated variables were flow rate of the bottom stream for the control of the bottom tritium concentration, and flow rate of the hydrogen stream for the control of the top tritium concentration. For both the variables, the response curve was expressed by the first-order lag system, and a PID controller could be applied. (authors)

Yamanishi, T.; Iwai, Y. [Tritium Engineering Group, JAEA, Tokai, Ibaraki, 319-1195 (Japan)

2008-07-15T23:59:59.000Z

316

An investigation of the buckling criteria of columns that have large angles of initial twist  

E-Print Network [OSTI]

of the requirements for the degree of MASTER OP SCIENCE August, 1962 Major Subject: Aeronautical Engineering AN INVESTIGATION OF THE BUCKLING CRITERIA. OF COLUMNS THAT HAVE LARGE ANGLES OF INITIAL TWIST A Thesis BASIL MAGEE JORDAN, JR. Approved ss to style... for the stepped columns were 2120 and 1750 pounds. The longer stepped oolumn buckled at 1750 pounds whereas the shorter column buckled at 2120 pounds. The theoretical buckling loads were calculated from mEI2 cr 2 L where m is a function of the length...

Jordan, Basil Magee, Jr

1962-01-01T23:59:59.000Z

317

A Study of Multistage/Multifunction Column for Fine Particle Separation.  

SciTech Connect (OSTI)

A non-agitated multi-stage column was constructed and applied to wastewater treatment. Preliminary oil/water separation tests were performed. Excellent separation results verifies the multi-function feature of the multi-stage column. Hydrodynamic behavior is considered as the underlying cause for the separation performance. Therefore, a series of experiments were carried out to investigate the hydrodynamic parameters, including gas holdups and liquid circulating velocities. The experimental data will be used to create a mathematical model to simulate the multi-stage column process. The model will further shed light on the future scale-up of the MSTLFLO process.

Chiang, S.

1997-09-15T23:59:59.000Z

318

A STUDY OF MULTISTAGE/MULTIFUNCTION COLUMN FOR FINE PARTICLE SEPARATION  

SciTech Connect (OSTI)

A non-agitated multi-stage column was constructed and applied to wastewater treatment. Preliminary oil/water separation tests were performed. Excellent separation results verifies the multi-function feature of the multi-stage column. Hydrodynamic behavior is considered as the underlying cause for the separation performance. Therefore, a series of experiments were carried out to investigate the hydrodynamic parameters, including gas holdups and liquid circulating velocities. The experimental data will be used to create a mathematical model to simulate the multi-stage column process. The model will further shed light on the future scale-up of the MSTLFLO process.

Dr. Shiao-Hung Chiang

1999-10-01T23:59:59.000Z

319

DUST EMISSION AND STAR FORMATION IN STEPHAN'S QUINTET  

SciTech Connect (OSTI)

We analyze a comprehensive set of MIR/FIR observations of Stephan's Quintet (SQ), taken with the Spitzer Space Telescope. Our study reveals the presence of a luminous (L{sub IR} {approx} 4.6 x 10{sup 43} erg s{sup -1}) and extended component of infrared dust emission, not connected with the main bodies of the galaxies, but roughly coincident with the X-ray halo of the group. We fitted the inferred dust emission spectral energy distribution of this extended source and the other main infrared emission components of SQ, including the intergalactic shock, to elucidate the mechanisms powering the dust and polycyclic aromatic hydrocarbon emission, taking into account collisional heating by the plasma and heating through UV and optical photons. Combining the inferred direct and dust-processed UV emission to estimate the star formation rate (SFR) for each source we obtain a total SFR for SQ of 7.5 M{sub sun} yr{sup -1}, similar to that expected for non-interacting galaxies with stellar mass comparable to the SQ galaxies. Although star formation in SQ is mainly occurring at, or external to the periphery of the galaxies, the relation of SFR per unit physical area to gas column density for the brightest sources is similar to that seen for star formation regions in galactic disks. We also show that available sources of dust in the group halo can provide enough dust to produce up to L{sub IR} {approx} 10{sup 42} erg s{sup -1} powered by collisional heating. Though a minority of the total infrared emission (which we infer to trace distributed star-formation), this is several times higher than the X-ray luminosity of the halo, so could indicate an important cooling mechanism for the hot intergalactic medium (IGM) and account for the overall correspondence between FIR and X-ray emission. We investigate two potential modes of star formation in SQ consistent with the data, fueled either by gas from a virialized hot IGM continuously accreting onto the group, whose cooling is enhanced by grains injected from an in situ population of intermediate mass stars, or by interstellar gas stripped from the galaxies. The former mode offers a natural explanation for the observed baryon deficiency in the IGM of SQ as well as for the steep L{sub X}-T{sub X} relation of groups such as SQ with lower velocity dispersions.

Natale, G.; Tuffs, R. J. [Max Planck Institute fuer Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg (Germany); Xu, C. K.; Lu, N. [Infrared Processing and Analysis Center, California Institute of Technology 100-22, Pasadena, CA 91125 (United States); Popescu, C. C. [University of Central Lancashire, Preston, PR1 2HE (United Kingdom); Fischera, J. [Canadian Institute for Theoretical Astrophysics, University of Toronto, 60 Saint George Street, Toronto, ON, M5S 3H8 (Canada); Lisenfeld, U. [Department de Fisica Teorica y del Cosmos, Universidad de Granada, Granada (Spain); Appleton, P. [NASA Herschel Science Center, IPAC, California Institute of Technology, Pasadena, CA 91125 (United States); Dopita, M. [Research School of Astronomy and Astrophysics, The Australian National University, Cotter Road, Weston Creek, ACT 2611 (Australia); Duc, P.-A. [Laboratoire AIM, CEA/DSM-CNRS-Universite Paris Diderot, Dapnia/Service d'Astrophysique, CEA-Saclay, 91191 Gif-sur-Yvette Cedex (France); Gao, Y. [Purple Mountain Observatory, Chinese Academy of Sciences, 2 West Beijing Road, Nanjing 210008 (China); Reach, W. [Spitzer Science Center, IPAC, California Institute of Technology, Pasadena, CA 91125 (United States); Sulentic, J. [Instituto de Astrofisica de AndalucIa, CSIC, Apdo. 3004, 18080, Granada (Spain); Yun, M., E-mail: giovanni.natale@mpi-hd.mpg.d, E-mail: richard.buffs@mpi-hd.mpg.d [Department of Astronomy, University of Massachusetts, Amherst, MA 01003 (United States)

2010-12-10T23:59:59.000Z

320

The evolution of star clusters: The resolved-star approach  

E-Print Network [OSTI]

We present the first results of a new technique to detect, locate, and characterize young dissolving star clusters. Using HST/ACS archival images of the nearby galaxy IC2574, we performed stellar PSF photometry and selected the most massive stars as our first test sample. We used a group-finding algorithm on the selected massive stars to find cluster candidates. We then plot the color-magnitude diagrams for each group, and use stellar evolutionary models to estimate their age. So far, we found 79 groups with ages of up to about 100 Myr, displaying various sizes and densities.

Anne Pellerin; Martin J. Meyer; Jason Harris; Daniela Calzetti

2008-02-29T23:59:59.000Z

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


321

Ion exchange columns for selective removal of cesium from aqueous radioactive waste using hydrous crystalline silico-titanates  

E-Print Network [OSTI]

conscious society. In Hanford, WA, hundreds of underground storage tanks hold tens of millions of gallons of aqueous radioactive waste. This liquid waste, which has a very high sodium content, contains trace amounts of radioactive cesium 137. Since... the material for batch ion exchange of the nuclear waste solution. More research was needed to investigate the material's effectiveness in a column operation. An ion exchange column system was developed to study column performance. The column design...

Ricci, David Michael

1995-01-01T23:59:59.000Z

322

Can the Operating Leaves of a Distillation Column Really Be Tshepo S. Modise, Michaela Tapp, Diane Hildebrandt,* and David Glasser  

E-Print Network [OSTI]

to infinity. All column profiles shown in this paper have been generated using the NRTL model at a system

Skogestad, Sigurd

323

AN EXPLANATION FOR THE DIFFERENT X-RAY TO OPTICAL COLUMN DENSITIES IN THE ENVIRONMENTS OF GAMMA RAY BURSTS: A PROGENITOR EMBEDDED IN A DENSE MEDIUM  

SciTech Connect (OSTI)

We study the {approx}> 10 ratios in the X-ray to optical column densities inferred from afterglow spectra of gamma ray bursts (GRBs) due to gas surrounding their progenitors. We present time-evolving photoionization calculations for these afterglows and explore different conditions of their environment. We find that homogenous models of the environment (constant density) predict X-ray columns similar to those found in the optical spectra, with the bulk of the opacity being produced by neutral material at large distances from the burst. This result is independent of gas density or metallicity. Only models assuming a progenitor immersed in a dense ({approx}10{sup 2-4} cm{sup -3}) cloud of gas (with radius {approx}10 pc), with a strong, declining gradient of density for the surrounding interstellar medium (ISM) are able to account for the large X-ray to optical column density ratios. However, to avoid an unphysical correlation between the size of this cloud and the size of the ionization front produced by the GRB, the models also require that the circumburst medium is already ionized prior to the burst. The inferred cloud masses are {approx}< 10{sup 6} M{sub Sun }, even if low metallicities in the medium are assumed (Z {approx} 0.1 Z{sub Sun }). These cloud properties are consistent with those found in giant molecular clouds and our results support a scenario in which the progenitors reside within intense star formation regions of galaxies. Finally, we show that modeling over large samples of GRB afterglows may offer strong constraints on the range of properties in these clouds, and the host galaxy ISM.

Krongold, Yair [Instituto de Astronomia, Universidad Nacional Autonoma de Mexico, Apartado Postal 70-264, 04510 Mexico DF (Mexico); Prochaska, J. Xavier, E-mail: xavier@ucolick.org [Department of Astronomy and Astrophysics, UCO/Lick Observatory, University of California, 1156 High Street, Santa Cruz, CA 95064 (United States)

2013-09-10T23:59:59.000Z

324

EPA ENERGY STAR Webinar: ENERGY STAR Portfolio Manager 201  

Broader source: Energy.gov [DOE]

Continue to learn about EPA’s ENERGY STAR Portfolio Manager tool, with a deeper dive into more advanced functionalities such as: managing and tracking changes to your property uses over time; using...

325

EPA ENERGY STAR Webcast: Value of ENERGY STAR Certification  

Broader source: Energy.gov [DOE]

For thousands of organizations, ENERGY STAR is the simple choice for saving money and demonstrating environmental leadership to the public. Lower energy costs aren't the only financial benefit of...

326

ENERGY STAR Webinar: Financing Energy Efficient Upgrades with ENERGY STAR  

Broader source: Energy.gov [DOE]

ENERGY STAR is hosting a webinar on how public sector organizations are improving energy efficiency with innovative solutions to financial barriers on Oct. 21, 2014, from 2:00 p.m. - 3:15 p.m.

327

EPA ENERGY STAR: Tackling Growth in Home Electronics and Small Appliances  

E-Print Network [OSTI]

behavior: the case of ENERGY STAR computers Unlike ENERGY STAR ME, participation in ENERGY STAR home

Sanchez, Marla Christine

2008-01-01T23:59:59.000Z

328

Wave Energy Extraction from an Oscillating Water Column in a Truncated Circular Cylinder  

E-Print Network [OSTI]

Oscillating Water Column (OWC) device is a relatively practical and convenient way that converts wave energy to a utilizable form, which is usually electricity. The OWC is kept inside a fixed truncated vertical cylinder, which is a hollow structure...

Wang, Hao

2013-07-19T23:59:59.000Z

329

Gamma-Ray Transmission Scans of Naphtha Splitter Column: A Case Study  

SciTech Connect (OSTI)

The gamma-ray transmission technique is well known and widely used to on-line examine inner details of industrial process column. For that purpose, a particular case study was conducted to diagnose the performance of a Naphtha Splitter Column in real time at one petrochemical plant in Malaysia. The technique employed Co-60 as a radioisotope sealed source to emit gamma radiation and a NaI(TI) scintillation as detector. This technique provides a visible representation of the true nature of the naphtha splitter column wherein the process and mechanical problems inside the column can be identified while it is in operation. This paper demonstrates details of the technique used and shows the result obtained.

Zain, Rasif Mohd; Rahman, Mohd Fitri Abd; Hasan, Nor Pa'iza Mohamad; Abdullah, Jaafar [Malaysian Nuclear Agency (Nuklear Malaysia), Bangi, 43000 Kajang, Selangor (Malaysia)

2008-05-20T23:59:59.000Z

330

DEVELOPMENT AND DESIGN OF A MULTI-COLUMN EXPERIMENTAL SETUP FOR KR/XE SEPARATION  

SciTech Connect (OSTI)

As a precursor to FY-15 Kr/Xe separation testing, design modifications to an existing experimental setup are warranted. The modifications would allow for multi-column testing to facilitate a Xe separation followed by a Kr separation using engineered form sorbents prepared using an INL patented process. A new cooling apparatus capable of achieving test temperatures to -40° C and able to house a newly designed Xe column was acquired. Modifications to the existing setup are being installed to allow for multi-column testing and gas constituent analyses using evacuated sample bombs. The new modifications will allow for independent temperature control for each column enabling a plethora of test conditions to be implemented. Sample analyses will be used to evaluate the Xe/Kr selectivity of the AgZ-PAN sorbent and determine the Kr purity of the effluent stream following Kr capture using the HZ-PAN sorbent.

Troy G. Garn; Mitchell Greenhalgh; Tony Watson

2014-12-01T23:59:59.000Z

331

Heat and mass transfer in bubble column dehumidifiers for HDH desalination  

E-Print Network [OSTI]

Heat and mass transfer processes governing the performance of bubble dehumidifier trays are studied in order to develop a predictive model and design rules for efficient and economical design of bubble column dehumidifiers ...

Tow, Emily W

2014-01-01T23:59:59.000Z

332

Seismic Assessment and Retrofit of Existing Multi-Column Bent Bridges  

E-Print Network [OSTI]

Seismic Assessment and Retrofit of Existing Multi-Column Bent Bridges By Cole C. Mc ................................................................................................................................... 6 Seismic Activity in Western Washington State Approach ­ Bridge Modeling .............................................11 Seismic Excitations

333

Modeling of FRP-jacketed RC columns subject to combined axial and lateral loads  

E-Print Network [OSTI]

LOCATIONS #6 u-bars @ 4" 3" PVC for axial load and verticalsteel Steel jacket encasing load stub 2" PVC for clevisattatch 3" PVC for axial load A B Vertical tiedown Column

Lee, Chung-Sheng

2006-01-01T23:59:59.000Z

334

Strategic Planning -College -Agricultural Sciences & Natural Resources Unit Assessment Report -Four Column  

E-Print Network [OSTI]

Strategic Planning - College - Agricultural Sciences & Natural Resources Unit Assessment Report - Four Column Texas Tech University Priorities Means of Assessment & Criteria / Tasks Results Action & Natural Resources - 2013 Priority 1_Increase Enrollment and Promote Student Success (CASNR - Outcome 1

Zhang, Yuanlin

335

Simulation of microbial transport and carbon tetrachloride biodegradation in intermittently-fed aquifer columns  

E-Print Network [OSTI]

Simulation of microbial transport and carbon tetrachloride biodegradation in intermittently associated with carbon tetrachloride (CT) biodegradation in laboratory aquifer columns operated with a pulsed Hydrology: Groundwater transport; KEYWORDS: biodegradation, carbon tetrachloride, microbial transport

336

Lateral behavior of reinforced concrete columns supported on Type II shafts  

E-Print Network [OSTI]

concrete strength reached the desired strength on the day of testingconcrete and reinforcing steel during the construction period and on the day of column-shaft assembly testing.during testing. However, the cracking of the concrete at the

Liu, Yujia

2012-01-01T23:59:59.000Z

337

Stringy Stability of Charged Dilaton Black Holes with Flat Event Horizon  

E-Print Network [OSTI]

Electrically charged black holes with flat event horizon in anti-de Sitter space have received much attention due to various applications in Anti-de Sitter/Conformal Field Theory (AdS/CFT) correspondence, from modeling the behavior of quark-gluon plasma to superconductor. Crucial to the physics on the dual field theory is the fact that when embedded in string theory, black holes in the bulk may become vulnerable to instability caused by brane pair-production. Since dilaton arises naturally in the context of string theory, we study the effect of coupling dilaton to Maxwell field on the stability of flat charged AdS black holes. In particular, we study the stability of Gao-Zhang black holes, which are locally asymptotically anti-de Sitter. We find that for dilaton coupling parameter $\\alpha$ > 1, flat black holes are stable against brane pair production, however for 0 electrical charges is increased. Such instability however, behaves somewhat differently from that of flat Reissner-Nordstr\\"om black holes. In addition, we prove that the Seiberg-Witten action of charged dilaton AdS black hole of Gao-Zhang type with flat event horizon (at least in 5-dimension) is always logarithmically divergent at infinity for finite values of $\\alpha$, and is finite and positive in the case $\\alpha$ tends to infinity . We also comment on the robustness of our result for other charged dilaton black holes that are not of Gao-Zhang type.

Yen Chin Ong; Pisin Chen

2014-12-29T23:59:59.000Z

338

Hanford/Rocky Flats collaboration on development of supercritical carbon dioxide extraction to treat mixed waste  

SciTech Connect (OSTI)

Proposals for demonstration work under the Department of Energy`s Mixed Waste Focus Area, during the 1996 through 1997 fiscal years included two applications of supercritical carbon dioxide to mixed waste pretreatment. These proposals included task RF15MW58 of Rocky Flats and task RL46MW59 of Hanford. Analysis of compatibilities in wastes and work scopes yielded an expectation of substantial collaboration between sites whereby Hanford waste streams may undergo demonstration testing at Rocky Flats, thereby eliminating the need for test facilities at Hanford. This form of collaboration is premised the continued deployment at Rocky Flats and the capability for Hanford samples to be treated at Rocky Flats. The recent creation of a thermal treatment contract for a facility near Hanford may alleviate the need to conduct organic extraction upon Rocky Flats wastes by providing a cost effective thermal treatment alternative, however, some waste streams at Hanford will continue to require organic extraction. Final site waste stream treatment locations are not within the scope of this document.

Hendrickson, D.W.; Biyani, R.K. [Westinghouse Hanford Co., Richland, WA (United States); Brown, C.M.; Teter, W.L. [Kaiser-Hill Co., Golden, CO (United States)

1995-11-01T23:59:59.000Z

339

Spherical Solutions in Einstein-Aether Theory: Static Aether and Stars  

E-Print Network [OSTI]

The time independent spherically symmetric solutions of General Relativity (GR) coupled to a dynamical unit timelike vector are studied. We find there is a three-parameter family of solutions with this symmetry. Imposing asymptotic flatness restricts to two parameters, and requiring that the aether be aligned with the timelike Killing field further restricts to one parameter, the total mass. These "static aether" solutions are given analytically up to solution of a transcendental equation. The positive mass solutions have spatial geometry with a minimal area 2-sphere, inside of which the area diverges at a curvature singularity occurring at an extremal Killing horizon that lies at a finite affine parameter along a radial null geodesic. Regular perfect fluid star solutions are shown to exist with static aether exteriors, and the range of stability for constant density stars is identified.

Christopher Eling; Ted Jacobson

2009-12-06T23:59:59.000Z

340

Ultra high pressure liquid chromatography column permeability and changes of the eluent properties  

SciTech Connect (OSTI)

The behavior of four similar liquid chromatography columns (2.1 mm i.d. x30, 50, 100, and 150 mm, all packed with fine particles, average d{sub p} {approx} 1.7 {micro}m, of bridged ethylsiloxane/silica hybrid-C{sub 18}, named BEH-C{sub 18}) was studied in wide ranges of temperature and pressure. The pressure and the temperature dependencies of the viscosity and the density of the eluent (pure acetonitrile) along the columns were also derived, using the column permeabilities and applying the Kozeny-Carman and the heat balance equations. The heat lost through the external surface area of the chromatographic column was directly derived from the wall temperature of the stainless steel tube measured with a precision of C in still air and C in the oven compartment. The variations of the density and viscosity of pure acetonitrile as a function of the temperature and pressure was derived from empirical correlations based on precise experimental data acquired between 298 and 373 K and at pressures up to 1.5 kbar. The measurements were made with the Acquity UPLC chromatograph that can deliver a maximum flow rate of 2 mL/min and apply a maximum column inlet pressure of 1038 bar. The average Kozeny-Carman permeability constant of the columns was 144 {+-} 3.5%. The temperature hence the viscosity and the density profiles of the eluent along the column deviate significantly from linear behavior under high-pressure gradients. For a 1000 bar pressure drop, we measured {Delta}T = 25-30 K, ({Delta}{eta}/{eta}) {approx_equal} 100%, and ({Delta}{rho}/{rho}) {approx_equal} 10%. These results show that the radial temperature profiles are never fully developed within 1% for any of the columns, even under still-air conditions. This represents a practical advantage regarding the apparent column efficiency at high flow rates, since the impact of the differential analyte velocity between the column center and the column wall is not maximum. The interpretation of the peak profiles recorded in UPLC is discussed.

Gritti, Fabrice [University of Tennessee, Knoxville (UTK); Guiochon, Georges A [ORNL

2008-01-01T23:59:59.000Z

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


341

A column based variance analysis approach to static reservoir model upgridding  

E-Print Network [OSTI]

A COLUMN BASED VARIANCE ANALYSIS APPROACH TO STATIC RESERVOIR MODEL UPGRIDDING A Thesis by MATTHEW BRANDON TALBERT Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE August 2008 Major Subject: Petroleum Engineering A COLUMN BASED VARIANCE ANALYSIS APPROACH TO STATIC RESERVOIR MODEL UPGRIDDING A Thesis by MATTHEW BRANDON TALBERT Submitted to the Office...

Talbert, Matthew Brandon

2008-10-10T23:59:59.000Z

342

A Heavy Flavor Tracker for STAR  

SciTech Connect (OSTI)

We propose to construct a Heavy Flavor Tracker (HFT) for the STAR experiment at RHIC. The HFT will bring new physics capabilities to STAR and it will significantly enhance the physics capabilities of the STAR detector at central rapidities. The HFT will ensure that STAR will be able to take heavy flavor data at all luminosities attainable throughout the proposed RHIC II era.

Xu, Z.; Chen, Y.; Kleinfelder, S.; Koohi, A.; Li, S.; Huang, H.; Tai, A.; Kushpil, V.; Sumbera, M.; Colledani, C.; Dulinski, W.; Himmi,A.; Hu, C.; Shabetai, A.; Szelezniak, M.; Valin, I.; Winter, M.; Surrow,B.; Van Nieuwenhuizen, G.; Bieser, F.; Gareus, R.; Greiner, L.; Lesser,F.; Matis, H.S.; Oldenburg, M.; Ritter, H.G.; Pierpoint, L.; Retiere, F.; Rose, A.; Schweda, K.; Sichtermann, E.; Thomas, J.H.; Wieman, H.; Yamamoto, E.; Kotov, I.

2005-03-14T23:59:59.000Z

343

X-ray Emission from Massive Stars  

E-Print Network [OSTI]

X-ray Emission from Massive Stars David Cohen Department of Physics and Astronomy Swarthmore be related to the production of X-rays on massive stars. If so, massive stars' X-rays are much different than those found our own Sun and other cooler stars like the Sun that produce X-rays via magnetic activity

Cohen, David

344

Roles of cavitation/column separation due to earthquake-induced hydraulic transients  

SciTech Connect (OSTI)

The roles of cavitation/column separation due to earthquake-induced hydraulic transients in pipe flow were investigated experimentally and theoretically. It is known that when the system pressure during a hydraulic transient reaches the saturation pressure of the liquid, cavitation/column separation occurs. When the cavities collapse or when the separated liquid columns rejoin, very high pressures are produced. The experiment employed a pipe mounted between a constant-pressure tank and a piston-type excitation device. The resulting pressure variation at the piston was recorded continually. Comparison of pressure response for various test runs indicated that the peak pressures at/near resonance frequency were not affected significantly by the excitation velocity amplitude in cases of cavitation/column separation. These results were confirmed by comparison with theoretical analysis. A numerical method to simulate column separation/cavitation was developed. In order to eliminate numerical oscillation, the flux-correction method was introduced. Results obtained suggest that the cavitation/column separation due to earthquake-induced hydraulic transients is an important damage mechanism.

Hwang, Y.D.

1986-01-01T23:59:59.000Z

345

Complete temperature profiles in ultra-high pressure liquid chromatography columns  

SciTech Connect (OSTI)

The temperature profiles were calculated along and across seven packed columns (lengths 30, 50, 100, and 150 mm, i.d., 1 and 2.1 mm, all packed with Acquity UPLC, BEH-C{sub 18} particles, average d{sub p} {approx} 1.7 {micro}m) and their stainless steel tubes (o.d. 4.53 and 6.35 mm). These columns were kept horizontal and sheltered from forced air convection (i.e., under still air conditions), at room temperature. They were all percolated with pure acetonitrile, either under the maximum pressure drop (1034 bar) or at the maximum flow rate (2 mL/min) permitted by the chromatograph. The heat balance equation of chromatographic columns was discretized and solved numerically with minimum approximation. Both the compressibility and the thermal expansion of the eluent were taken into account. The boundary conditions were determined from the experimental measurements of the column inlet pressure and of the temperature profile along the column wall, which were made with a precision better than {+-}0.1 K. These calculation results provide the 3-D temperature profiles along and across the columns. The axial and radial temperature gradients are discussed in relationship with the experimental conditions used. The temperature map obtained permits a prediction of the chromatographic data obtained under a very high pressure gradient.

Gritti, Fabrice [University of Tennessee, Knoxville (UTK); Guiochon, Georges A [ORNL

2008-01-01T23:59:59.000Z

346

Relativistic outflow from two thermonuclear shell flashes on neutron stars  

E-Print Network [OSTI]

We study the exceptionally short (32-41 ms) precursors of two intermediate-duration thermonuclear X-ray bursts observed with RXTE from the neutron stars in 4U 0614+09 and 2S 0918-549. They exhibit photon fluxes that surpass those at the Eddington limit later in the burst by factors of 2.6 to 3.1. We are able to explain both the short duration and the super-Eddington flux by mildly relativistic outflow velocities of 0.1$c$ to 0.3$c$ subsequent to the thermonuclear shell flashes on the neutron stars. These are the highest velocities ever measured from any thermonuclear flash. The precursor rise times are also exceptionally short: about 1 ms. This is inconsistent with predictions for nuclear flames spreading laterally as deflagrations and suggests detonations instead. This is the first time that a detonation is suggested for such a shallow ignition column depth ($y_{\\rm ign}$ = 10$^{10}$ g cm$^{-2}$). The detonation would possibly require a faster nuclear reaction chain, such as bypassing the alpha-capture on $^...

Zand, Jean in 't; Cavecchi, Yuri

2014-01-01T23:59:59.000Z

347

The STAR Vertex Position Detector  

E-Print Network [OSTI]

The 2x3 channel pseudo Vertex Position Detector (pVPD) in the STAR experiment at RHIC has been upgraded to a 2x19 channel detector in the same acceptance, called the Vertex Position Detector (VPD). This detector is fully integrated into the STAR trigger system and provides the primary input to the minimum-bias trigger in Au+Au collisions. The information from the detector is used both in the STAR Level-0 trigger and offline to measure the location of the primary collision vertex along the beam pipe and the event "start time" needed by other fast-timing detectors in STAR. The offline timing resolution of single detector channels in full-energy Au+Au collisions is ~100 ps, resulting in a start time resolution of a few tens of picoseconds and a resolution on the primary vertex location of ~1 cm.

W. J. Llope; J. Zhou; T. Nussbaum; G. W. Hoffmann; K. Asselta; J. D. Brandenburg; J. Butterworth; T. Camarda; W. Christie; H. J. Crawford; X. Dong; J. Engelage; G. Eppley; F. Geurts; J. Hammond; E. Judd; D. L. McDonald; C. Perkins; L. Ruan; J. Scheblein; J. J. Schambach; R. Soja; K. Xin; C. Yang

2014-03-26T23:59:59.000Z

348

ENERGY STAR Portfolio Manager 101  

Office of Energy Efficiency and Renewable Energy (EERE)

Join us as we introduce and demonstrate the core functionality of EPA’s ENERGY STAR Portfolio Manager tool. Attendees will learn how to: navigate Portfolio Manager; add a property and enter details...

349

ENERGY STAR Portfolio Manager 201  

Office of Energy Efficiency and Renewable Energy (EERE)

Continue to learn about EPA’s new ENERGY STAR Portfolio Manager tool, with a deeper dive into more advanced functionalities such as: managing and tracking changes to your property uses over time;...

350

Star Lakes and Rivers (Minnesota)  

Broader source: Energy.gov [DOE]

An association organized for the purpose of addressing issues on a specific lake or river, a lake improvement district, or a lake conservation district may apply to the Star Lake Board for...

351

Gravitational Waves from Relativistic Stars  

E-Print Network [OSTI]

Stellar pulsations in rotating relativistic stars are reviewed. Slow rotation approximation is applied to solving the Einstein equations. The rotational effects on the non-axisymmetric oscillations are explicitly shown in the polar and axial modes.

Yasufumi Kojima

2000-02-23T23:59:59.000Z

352

NYSERDA- Energy Star Home Builders  

Broader source: Energy.gov [DOE]

NYSERDA offers a program to encourage more industry involvement in the building of Energy Star rated Homes. Incentives are available for newly constructed residential dwellings of 3 stories or less...

353

Inversion of the star transform  

E-Print Network [OSTI]

We define the star transform as a generalization of the broken ray transform introduced by us in previous work. The advantages of using the star transform include the possibility to reconstruct the absorption and the scattering coefficients of the medium separately and simultaneously (from the same data) and the possibility to utilize scattered radiation which, in the case of the conventional X-ray tomography, is discarded. In this paper, we derive the star transform from physical principles, discuss its mathematical properties and analyze numerical stability of inversion. In particular, it is shown that stable inversion of the star transform can be obtained only for configurations involving odd number of rays. Several computationally-efficient inversion algorithms are derived and tested numerically.

Fan Zhao; John C. Schotland; Vadim A. Markel

2014-05-06T23:59:59.000Z

354

GRBs from the First Stars  

SciTech Connect (OSTI)

We present an estimate of the Gamma Ray Bursts which should be expected from metal-free, elusive first generation of stars known as PopulationIII (PopIII). We derive the GRB rate from these stars from the Stellar Formation Rate obtained in several Reionization scenarios available in the literature. In all of the analyzed models we find that GRBs from PopIII are subdominant with respect to the ''standard'' (PopII) ones up to z {approx} 10.

Iocco, Fabio; /Naples U. /KIPAC, Menlo Park

2007-04-16T23:59:59.000Z

355

STAR Vertex Detector Upgrade Development  

SciTech Connect (OSTI)

We report on the development and prototyping efforts undertaken with the goal of producing a micro-vertex detector for the STAR experiment at the RHIC accelerator at BNL. We present the basic detector requirements and show a sensor development path, conceptual mechanical design candidates and readout architecture. Prototyping and beam test results with current generation MimoSTAR-2 sensors and a readout system featuring FPGA based on-the-fly hit finding and data sparsification are also presented.

Greiner, Leo C.; Matis, Howard S.; Stezelberger, Thorsten; Vu,Chinh Q.; Wieman, Howard; Szelezniak, Michal; Sun, Xiangming

2008-01-28T23:59:59.000Z

356

Magnesium Isotopes in Halo Stars  

E-Print Network [OSTI]

We have determined Mg isotope ratios in halo field dwarfs and giants in the globular cluster M71 based on high S/N high spectral resolution (R = 10$^5$) Keck HIRES spectra. Unlike previous claims of an important contribution from intermediate-mass AGB stars to the Galactic halo, we find that our $^{26}$Mg/$^{24}$Mg ratios can be explained by massive stars.

Jorge Melendez; Judith G. Cohen

2007-08-29T23:59:59.000Z

357

Helium in Chemically Peculiar Stars  

E-Print Network [OSTI]

For the purpose of deriving the helium abundances in chemically peculiar stars, the importance of assuming a correct helium abundance has been investigated for determining the effective temperature and gravity of main sequence B-type stars, making full use of the present capability of reproducing their helium lines. Even if the flux distribution of main sequence B-type stars appears to depend only on the effective temperature for any helium abundance, the effective temperature, gravity and helium abundance have to be determined simultaneously by matching the Balmer line profiles. New MULTI NLTE calculations, performed adopting ATLAS9 model atmospheres and updated helium atomic parameters, reproduce most of the observed equivalent widths of neutral helium lines for main sequence B-type stars and they make us confident of the possibility to correctly derive the helium abundance in chemically peculiar stars. An application of previous methods to the helium rich star HD 37017 shows that helium could be stratified in the magnetic pole regions, as expected in the framework of the diffusion theory in the presence of mass loss.

F. Leone

1998-05-05T23:59:59.000Z

358

Upsilon Productions at STAR  

E-Print Network [OSTI]

The $\\Upsilon(1S+2S+3S)\\to e^{+}e^{-}$ cross section is measured at mid-rapidity ($y$) in $p+p$ collisions and in d$+Au$ collisions at center-of-mass energy $\\sqrt{s}$ = 200 GeV with the STAR detector at RHIC. In $p+p$, the measured cross section is found to be consistent with the world data trend as a function of $\\sqrt{s}$, in agreement with the Color Evaportaion Model (CEM), and underestimated by the Color Singlet Model (CSM) up to the Next-to-Leading-Order Quantum Chromodynamics (NLO QCD) calculations. In d+$Au$, the measured cross section is in agreement with the CEM prediction with anti-shadowing effects, and the nuclear modification factor indicates that $\\Upsilon(1S+2S+3S)$ production follows binary scaling within the current uncertainties. These measurements provide a benchmark for the future measurements of $\\Upsilon$ production in $Au+Au$ collisions.

A. M. Hamed

2010-05-22T23:59:59.000Z

359

Friction factor data for flat plate tests of smooth and honeycomb surfaces  

E-Print Network [OSTI]

are needed. The purpose of this report is to present the air flow friction factor data for honeycomb surfaces (i.e., 1.57 mm, 0.79 mm and 0.51 mm in cell width, 3.81 mm and 2.29 mm in cell depth) with a flat plate tester. The flat plate tester is designed....2bar, and 17.9bar, respectively and 3 clearances between honeycombs which are 0.25mm, 0.38mm and 0.51mm. These clearance values are representative of actual seals used in the turbomachinary. The following questions wil l be answered: 1) Does...

Ha, Tae Woong

1989-01-01T23:59:59.000Z

360

THz-radiation production using dispersively-selected flat electron bunches  

E-Print Network [OSTI]

We propose an alternative scheme for a tunable THz radiation source generated by relativistic electron bunches. This technique relies on the combination of dispersive selection and flat electron bunch. The dispersive selection uses a slit mask inside a bunch compressor to transform the energy-chirped electron beam into a bunch train. The flat beam transformation boosts the frequency range of the THz source by reducing the beam emittance in one plane. This technique generates narrow-band THz radiation with a tuning range between 0.2 - 4 THz. Single frequency THz spectrum can also be generated by properly choosing the slit spacing, slit width, and the energy chirp.

Thangaraj, Jayakar

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "flat column stars" 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

Property:OpenEI/UtilityRate/FlatDemandMonth8 | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia: Energy ResourcesLoadingPenobscotInformation Max Jump to:FlatDemandMonth3 Jump to:FlatDemandMonth8 Jump to:

362

Property:OpenEI/UtilityRate/FlatDemandMonth9 | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia: Energy ResourcesLoadingPenobscotInformation Max Jump to:FlatDemandMonth3 Jump to:FlatDemandMonth8 Jump

363

Induced matter: Curved N-manifolds encapsulated in Riemann-flat N+1 dimensional space  

E-Print Network [OSTI]

Liko and Wesson have recently introduced a new 5-dimensional induced matter solution of the Einstein equations, a negative curvature Robertson-Walker space embedded in a Riemann flat 5-dimensional manifold. We show that this solution is a special case of a more general theorem prescribing the structure of certain N+1-dimensional Riemann flat spaces which are all solutions of the Einstein equations. These solutions encapsulate N-dimensional curved manifolds. Such spaces are said to "induce matter" in the sub-manifolds by virtue of their geometric structure alone. We prove that the N-manifold can be any maximally symmetric space.

Harry I. Ringermacher; Lawrence R. Mead

2005-11-02T23:59:59.000Z

364

Dynamic pressure response of water flow between closely spaced roughened flat plates  

E-Print Network [OSTI]

of MASTER OF SCIENCE May 1993 Major Subject: Mechanical Engineering DYNAMIC PRESSURE RESPONSE OF WATER FLOW BETWEEN CLOSELY SPACED ROUGHENED FLAT PLATES A Thesis by JOHN CHARLES HESS Approved as to style and content by: Robert E. DeOtte, Jr. (Co.... S. , Texas A&M University Co-Chairs of Advisory Committee: Dr. R. E. DeOtte, Jr, Dr. G, L, Morrison A flat plate tester was designed and built to determine friction factors and dynamic pressures for water flow over smooth, knurl, and cavity...

Hess, John Charles

2012-06-07T23:59:59.000Z

365

THE CIRCUMNUCLEAR STAR FORMATION ENVIRONMENT OF NGC 6946: Br ? AND H{sub 2} RESULTS FROM KECK INTEGRAL FIELD SPECTROSCOPY  

SciTech Connect (OSTI)

We present a three-dimensional data cube of the K-band continuum and the Br ?, H{sub 2} S(0), and S(1) lines within the central 18.''5 × 13.''8 (520 pc × 390 pc) region of NGC 6946. Data were obtained using OSIRIS, a near-infrared Integral Field Spectrograph at Keck Observatory, with Laser Guide Star Adaptive Optics. The 0.''3 resolution allows us to investigate the stellar bulge and the forming star clusters in the nuclear region on 10 pc scales. We detect giant H II regions associated with massive young star clusters in the nuclear spiral/ring (R ? 30 pc) and in the principal shocks along the nuclear bar. Comparisons of the Br ? fluxes with Pa ? line emission and radio continuum indicate A{sub K} ? 3, A{sub V} ? 25 for the nuclear star-forming regions. The most luminous H II regions are restricted to within 70 pc of the center, despite the presence of high gas columns at larger radii (R ? 200 pc). H{sub 2} emission is restricted to clouds within R ? 60 pc of the center, resembling the distribution of HCN line emission. We propose that gas-assisted migration of the young star clusters is contributing to the buildup of the nuclear bar and nuclear star cluster (R < 30 pc) in this galaxy.

Tsai, Chao-Wei [Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125 (United States); Turner, Jean L. [Department of Physics and Astronomy, UCLA, Los Angeles, CA 90095-1547 (United States); Beck, Sara C. [Department of Physics and Astronomy, Tel Aviv University, Ramat Aviv (Israel); Meier, David S. [Department of Physics, New Mexico Institute of Mining and Technology, Socorro, NM 87801 (United States); Wright, Shelley A., E-mail: Chao-Wei.Tsai@jpl.nasa.gov [Dunlap Institute for Astronomy and Astrophysics, University of Toronto, Toronto, Ontario (Canada)

2013-10-20T23:59:59.000Z

366

Undergraduate Honors Research Projects Assessing Flat Field Quality at the University of Maryland Observatory, David Blankenship,  

E-Print Network [OSTI]

, Brett M. Morris, (Derek Richardson) 2012. Neutron Star Radii: Theoretical Tests of Frequency Scattering using HNBody, James Keane, (Douglas P. Hamilton) 2011 Measurements of the Mass and Radius of the Neutron Star 4U 1636-53 Using Millisecond Brightness Oscillations during Thermonuclear X-ray Bursts, Ryan

Gruner, Daniel S.

367

Feedback from Protostellar Outflows in Star and Star Cluster Formation  

E-Print Network [OSTI]

Magnetic stresses collimate protostellar winds into a common distribution of force with angle. Sweeping into the ambient medium, such winds drive bipolar molecular outflows whose properties are insensitive to the distribution of ambient gas and to the details of how the wind is launched, and how its intensity varies over time. Moreover, these properties are in accord with the commonly observed features of outflows. This model is simple enough to permit a quantitative study of the feedback effects from low-mass star formation. It predicts the rate at which star-forming gas is ejected by winds, and hence the efficiency with which stars form. Applied to individual star formation, it relates the stellar initial mass function to the distribution of pre-stellar cores. Applied to cluster formation, it indicates whether the resulting stellar system will remain gravitationally bound. Using the energy injection and mass ejection implied by this model, we investigate the dynamical evolution of a molecular clump as a stellar cluster forms within it. This depends critically on the rate at which turbulence decays: it may involve equilibrium star formation (slow decay), overstable oscillations, or collapse (fast decay).

Christopher D. Matzner

2000-07-13T23:59:59.000Z

368

ENERGY STAR Test Procedures and Verification | Department of...  

Energy Savers [EERE]

ENERGY STAR ENERGY STAR Test Procedures and Verification ENERGY STAR Test Procedures and Verification The Department of Energy (DOE) is the lead agency in the development and...

369

Tools for Closure Project and Contract Management: Development of the Rocky Flats Integrated Closure Project Baseline  

SciTech Connect (OSTI)

This paper details the development of the Rocky Flats Integrated Closure Project Baseline - an innovative project management effort undertaken to ensure proactive management of the Rocky Flats Closure Contract in support of the Department's goal for achieving the safe closure of the Rocky Flats Environmental Technology Site (RFETS) in December 2006. The accelerated closure of RFETS is one of the most prominent projects within the Department of Energy (DOE) Environmental Management program. As the first major former weapons plant to be remediated and closed, it is a first-of-kind effort requiring the resolution of multiple complex technical and institutional challenges. Most significantly, the closure of RFETS is dependent upon the shipment of all special nuclear material and wastes to other DOE sites. The Department is actively working to strengthen project management across programs, and there is increasing external interest in this progress. The development of the Rocky Flats Integrated Closure Project Baseline represents a groundbreaking and cooperative effort to formalize the management of such a complex project across multiple sites and organizations. It is original in both scope and process, however it provides a useful precedent for the other ongoing project management efforts within the Environmental Management program.

Gelles, C. M.; Sheppard, F. R.

2002-02-26T23:59:59.000Z

370

A SOLAR STILL AUGMENTED WITH A FLAT-PLATE COLLECTOR AND A REFLECTOR  

E-Print Network [OSTI]

A SOLAR STILL AUGMENTED WITH A FLAT-PLATE COLLECTOR AND A REFLECTOR A. Saleh A. Badran Mechanical ­ Jordan Amman ­ Jordan e-mail: asaleh@philadelphia.edu.jo e-mail: badran@ju.edu.jo ABSTRACT A solar distillation system was built and tested to study the effect of increasing the solar radiation incident

371

Analysis of Fracture in Cores from the Tuff Confining Unit beneath Yucca Flat, Nevada Test Site  

SciTech Connect (OSTI)

The role fractures play in the movement of groundwater through zeolitic tuffs that form the tuff confining unit (TCU) beneath Yucca Flat, Nevada Test Site, is poorly known. This is an important uncertainty, because beneath most of Yucca Flat the TCU lies between the sources of radionuclide contaminants produced by historic underground nuclear testing and the regional carbonate aquifer. To gain a better understanding of the role fractures play in the movement of groundwater and radionuclides through the TCU beneath Yucca Flat, a fracture analysis focusing on hydraulic properties was performed on conventional cores from four vertical exploratory holes in Area 7 of Yucca Flat that fully penetrate the TCU. The results of this study indicate that the TCU is poorly fractured. Fracture density for all fractures is 0.27 fractures per vertical meter of core. For open fractures, or those observed to have some aperture, the density is only 0.06 fractures per vertical meter of core. Open fractures are characterized by apertures ranging from 0.1 to 10 millimeter, and averaging 1.1 millimeter. Aperture typically occurs as small isolated openings along the fracture, accounting for only 10 percent of the fracture volume, the rest being completely healed by secondary minerals. Zeolite is the most common secondary mineral occurring in 48 percent of the fractures observed.

Lance Prothro

2008-03-01T23:59:59.000Z

372

Recovering Shape Characteristics on Near-flat Specular Surfaces Yuanyuan Ding and Jingyi Yu  

E-Print Network [OSTI]

surfaces have also been directly integrated into Figure 1. Distortions observed on near-flat window surfaces. animations and film footage to reproduce realistic phenom- ena [4]. In this paper, we focus example is the image observed on a window as shown in Figure 1. Although the surface is highly planar

Taufer, Michela

373

Geometric Control and Differential Flatness of a Quadrotor UAV with a Cable-Suspended Load  

E-Print Network [OSTI]

is established to be a differentially-flat hybrid system with the load position and the quadrotor yaw serving on the configuration space SE(3)Ă?S2 , is obtained by taking variations on manifolds. The quadrotor-load system, see [9]. However, carrying an external load through a gripper increases the inertia of the system

Sreenath, Koushil

374

An evaluation of the thermal characteristics of a flat plate heat pipe spreader  

E-Print Network [OSTI]

loss could bc determined. Duc to the axisymmetric nature of the i. echnique, it was necessary to define the effective radial heat pipe dimensions. ln the case of a disk shaped flat heat pipe, the effective radius is equal to the radius of the disk...

Chesser, Jason Blake

2000-01-01T23:59:59.000Z

375

A lowstand epikarstic intertidal flat from the middle Silurian of Gotland, Sweden  

E-Print Network [OSTI]

A lowstand epikarstic intertidal flat from the middle Silurian of Gotland, Sweden Mikael Calner, Sweden Received 17 August 2000; accepted 29 June 2001 Abstract This paper describes the sedimentology the Klintehamn area on western Gotland (Sweden). The epikarst represents the most distal portion

Calner, Mikael

376

KINEMATIC CONTROL OF A NONHOLONOMIC WHEELED MOBILE MANIPULATOR A DIFFERENTIAL FLATNESS APPROACH  

E-Print Network [OSTI]

the terminal conditions in the flat output space while control design reduces to a pole-placement problem) electro-mechanical testing. NOMENCLATURE WMR Wheeled Mobile Robot WMM Wheeled Mobile Manipulator ( ),x y Cartesian coordinates of the center of the wheel axle of the WMR Orientation of the WMR with respect

Krovi, Venkat

377

Supercontinuum-based 10-GHz flat-topped optical frequency comb generation  

E-Print Network [OSTI]

and Nanoscience Department, Chalmers University of Technology, SE-41296 Göteborg, Sweden * rwu@purdue.edu Abstract-topped optical frequency comb (> 3.64-THz or 28 nm bandwidth with ~365 spectral lines within 3.5-dB power device allows the pulses to enter into the optical wave-breaking regime, thus achieving a smooth flat

Purdue University

378

Mineralogic Zonation Within the Tuff Confining Unit, Yucca Flat, Nevada Test Site  

SciTech Connect (OSTI)

Recently acquired mineralogic data from drill hole samples in Yucca Flat show that the tuff confining unit (TCU) can be subdivided into three mineralogic zones based on the relative abundances of primary and secondary mineral assemblages. These zones are (1) an upper zone characterized by the abundance of the zeolite mineral clinoptilolite with lesser amounts of felsic and clay minerals; (2) a middle zone with felsic minerals dominant over clinoptilolite and clay minerals; and (3) a basal argillic zone where clay minerals are dominant over felsic minerals and clinoptilolite. Interpretation of the mineralogic data, along with lithologic, stratigraphic, and geophysical data from approximately 500 drill holes, reveals a three-layer mineralogic model for the TCU that shows all three zones are extensive beneath Yucca Flat. The mineralogic model will be used to subdivide the TCU in the Yucca Flat hydrostratigraphic framework model, resulting in a more accurate and versatile framework model. In addition, the identification of the type, quantity, and distribution of minerals within each TCU layer will permit modelers to better predict the spatial distribution and extent of contaminant transport from underground tests in Yucca Flat, at both the level of the hydrologic source term and the corrective action unit.

Lance Prothro

2005-09-01T23:59:59.000Z

379

Supervised Learning via Discriminative k q-Flats Arthur Szlam and Guillermo Sapiro  

E-Print Network [OSTI]

modify this energy so that it penalizes classification errors. In this note we consider the following-q-flats algorithm for pattern classification is introduced in this work. The ba- sic idea is to replace the original, showing that the method is computa- tionally very efficient and gives excellent results on standard

Soatto, Stefano

380

Interacting polytropic gas model of phantom dark energy in non-flat universe  

E-Print Network [OSTI]

By introducing the polytropic gas model of interacting dark energy, we obtain the equation of state for the polytropic gas energy density in a non-flat universe. We show that for even polytropic index by choosing $K>Ba^{\\frac{3}{n}}$, one can obtain $\\omega^{\\rm eff}_{\\Lambda}<-1$, which corresponds to a universe dominated by phantom dark energy.

K. Karami; S. Ghaffari; J. Fehri

2009-11-25T23:59:59.000Z

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


381

A Soft Wearable Robotic Device for Active Knee Motions using Flat Pneumatic Artificial Muscles  

E-Print Network [OSTI]

elastomer muscles were employed for assisted knee extension and flexion. The robotic device was testedA Soft Wearable Robotic Device for Active Knee Motions using Flat Pneumatic Artificial Muscles Yong present the design of a soft wearable robotic device composed of elastomeric artificial muscle actuators

Park, Yong-Lae

382

RIGID FLAT WEBS ON THE PROJECTIVE PLANE DAVID MARIN AND JORGE VITORIO PEREIRA  

E-Print Network [OSTI]

RIGID FLAT WEBS ON THE PROJECTIVE PLANE DAVID MAR´IN AND JORGE VIT´ORIO PEREIRA Abstract the invitation of CRM at Bellaterra in July 2010. 1 #12;2 DAVID MAR´IN AND JORGE VIT ´ORIO PEREIRA for a generic

Pereira, Jorge VitĂłrio

383

Mercury Contamination from Hydraulic Placer-Gold Mining in the Dutch Flat Mining  

E-Print Network [OSTI]

179 Mercury Contamination from Hydraulic Placer-Gold Mining in the Dutch Flat Mining District, California By Michael P. Hunerlach, James J. Rytuba, and Charles N. Alpers ABSTRACT Mercury contamination mercury (quicksilver) was used extensively for the recovery of gold at both placer and hardrock mines

384

EIS-0064: Rocky Flats Plant Site, Jefferson County, Golden, Colorado (see also ERDA-1545-D)  

Broader source: Energy.gov [DOE]

The U.S. Department of Energy developed this statement to evaluate the site specific environmental impacts of continuing to conduct nuclear weapons production activities at the Rocky Flats Plant; alternatives for the conduct of such activities; and environmental impacts of the U.S. policy to produce nuclear weapons.

385

New Method for Evaluating Irreversible Adsorption and Stationary Phase Bleed in Gas Chromatographic Capillary Columns  

SciTech Connect (OSTI)

A novel method for the evaluation of gas chromatographic (GC) column inertness has been developed using a tandem GC approach. Typically column inertness is measured by analyte peak shape evaluation. In general, silica, glass, and metal surfaces are chemically reactive and can cause analyte adsorption, which typically is observed as chromatographic peak tailing. Adsorption processes produce broad, short chromatographic peaks that confound peak area determinations because a significant portion can reside in the noise. In addition, chromatographic surfaces and stationary phases can irreversibly adsorb certain analytes without obvious degradation of peak shape. The inertness measurements described in this work specifically determine the degree of irreversible adsorption behavior of specific target compounds at levels ranging from approximately 50 picograms to 1 nanogram on selected gas chromatographic columns. Chromatographic columns with 5% phenylmethylsiloxane, polyethylene glycol (wax), trifluoropropylsiloxane, and 78% cyanopropylsiloxane stationary phases were evaluated with a variety of phosphorus- and sulfur- containing compounds selected as test compounds due to their ease of adsorption and importance in trace analytical detection. In addition, the method was shown effective for characterizing column bleed.

Wright, Bob W.; Wright, Cherylyn W.

2012-10-26T23:59:59.000Z

386

Comparison of flat cleaved and cylindrical diffusing fibers as treatment sources for interstitial photodynamic therapy  

SciTech Connect (OSTI)

Purpose: For interstitial photodynamic therapy (iPDT) of bulky tumors, careful treatment planning is required in order to ensure that a therapeutic dose is delivered to the tumor, while minimizing damage to surrounding normal tissue. In clinical contexts, iPDT has typically been performed with either flat cleaved or cylindrical diffusing optical fibers as light sources. Here, the authors directly compare these two source geometries in terms of the number of fibers and duration of treatment required to deliver a prescribed light dose to a tumor volume. Methods: Treatment planning software for iPDT was developed based on graphics processing unit enhanced Monte Carlo simulations. This software was used to optimize the number of fibers, total energy delivered by each fiber, and the position of individual fibers in order to deliver a target light dose (D{sub 90}) to 90% of the tumor volume. Treatment plans were developed using both flat cleaved and cylindrical diffusing fibers, based on tissue volumes derived from CT data from a head and neck cancer patient. Plans were created for four cases: fixed energy per fiber, fixed number of fibers, and in cases where both or neither of these factors were fixed. Results: When the number of source fibers was fixed at eight, treatment plans based on flat cleaved fibers required each to deliver 7180–8080 J in order to deposit 90 J/cm{sup 2} in 90% of the tumor volume. For diffusers, each fiber was required to deliver 2270–2350 J (333–1178 J/cm) in order to achieve this same result. For the case of fibers delivering a fixed 900 J, 13 diffusers or 19 flat cleaved fibers at a spacing of 1 cm were required to deliver the desired dose. With energy per fiber fixed at 2400 J and the number of fibers fixed at eight, diffuser fibers delivered the desired dose to 93% of the tumor volume, while flat cleaved fibers delivered this dose to 79%. With both energy and number of fibers allowed to vary, six diffusers delivering 3485–3600 J were required, compared to ten flat cleaved fibers delivering 2780–3600 J. Conclusions: For the same number of fibers, cylindrical diffusers allow for a shorter treatment duration compared to flat cleaved fibers. For the same energy delivered per fiber, diffusers allow for the insertion of fewer fibers in order to deliver the same light dose to a target volume.

Baran, Timothy M., E-mail: timothy.baran@rochester.edu; Foster, Thomas H. [Department of Imaging Sciences, University of Rochester, Rochester, New York 14642 (United States)] [Department of Imaging Sciences, University of Rochester, Rochester, New York 14642 (United States)

2014-02-15T23:59:59.000Z

387

878 JOURNAL OF MICROELECTROMECHANICAL SYSTEMS, VOL. 19, NO. 4, AUGUST 2010 A Flat Heat Pipe Architecture Based on  

E-Print Network [OSTI]

878 JOURNAL OF MICROELECTROMECHANICAL SYSTEMS, VOL. 19, NO. 4, AUGUST 2010 A Flat Heat Pipe pipe is developed for Thermal Ground Plane (TGP) appli- cations. The Ti-based heat pipe architecture chamber. The scalable heat pipes' flat geometry facilitates contact with planar heat sources

MacDonald, Noel C.

388

Heat Transfer -1 A satellite in space orbits the sun. The satellite can be approximated as a flat plate with  

E-Print Network [OSTI]

Heat Transfer - 1 A satellite in space orbits the sun. The satellite can be approximated as a flat plate with dimensions and properties given below. (a) Calculate the solar heat flux (W/m2 is at a distance where the solar heat flux (as defined above) is 500 W/m2 , and the flat plate is oriented

Virginia Tech

389

Toy Stars in two dimensions  

E-Print Network [OSTI]

Toy Stars are gas masses where the compressibility is treated without approximations but gravity is replaced by a force which, for any pair of masses, is along their line of centres and proportional to their separation. They provide an invaluable resource for testing the suitability of numerical codes for astrophysical gas dynamics. In this paper we derive the equations for both small amplitude oscillations and non linear solutions for rotating and pulsating Toy Stars in two dimensions, and show that the solutions can be reduced to a small number of ordinary differential equations. We compare the accurate solutions of these equations with Smoothed Particle Hydrodynamics (SPH) simulations. The two dimensional Toy Star solutions are found to provide an excellent benchmark for SPH algorithms, highlighting many of the strengths and also some weaknesses of the method.

J. J. Monaghan; D. J. Price

2005-10-25T23:59:59.000Z

390

The Star Formation History of NGC 6822  

E-Print Network [OSTI]

Images of five fields in the Local Group dwarf irregular galaxy NGC 6822 obtained with the {\\it Hubble Space Telescope} in the F555W and F814W filters are presented. Photometry for the stars in these images was extracted using the Point-Spread-Function fitting program HSTPHOT/MULTIPHOT. The resulting color-magnitude diagrams reach down to $V\\approx26$, a level well below the red clump, and were used to solve quantitatively for the star formation history of NGC 6822. Assuming that stars began forming in this galaxy from low-metallicity gas and that there is little variation in the metallicity at each age, the distribution of stars along the red giant branch is best fit with star formation beginning in NGC 6822 12-15 Gyr ago. The best-fitting star formation histories for the old and intermediate age stars are similar among the five fields and show a constant or somewhat increasing star formation rate from 15 Gyr ago to the present except for a possible dip in the star formation rate from 3 to 5 Gyr ago. The main differences among the five fields are in the higher overall star formation rate per area in the bar fields as well as in the ratio of the recent star formation rate to the average past rate. These variations in the recent star formation rate imply that stars formed within the past 0.6 Gyr are not spatially very well mixed throughout the galaxy.

Ted K. Wyder

2001-07-31T23:59:59.000Z

391

Dynamics and control of a heterogeneous azeotropic distillation column: Conventional control approach  

SciTech Connect (OSTI)

In this work, bifurcation analysis and dynamic simulation were used to investigate the optimum conventional control strategy of an isopropyl alcohol (IPA), cyclohexane (CyH), and water (H{sub 2}O) heterogeneous azeotropic column. Steady-state process analysis shows that the optimal operation point should be located at a critical reflux, a transition point at which the distillation path switches from a route that passes through the IPA + H{sub 2}O azeotrope to one that passes through the IPA + CyH azeotrope. A good control strategy must be able to maintain a steady column temperature profile that shows a plateau near 70 C to ensure passage around the IPA + CyH azeotrope. An inverse double-loop control strategy is proposed based on principal component analysis. This scheme is capable of maintaining the desired column temperature profile given all kinds of feed disturbances, thus keeping the product IPA purity at the desired level.

Chien, I.L. [National Taiwan Univ. of Science and Technology, Taipei (Taiwan, Province of China). Dept. of Chemical Engineering; Wang, C.J.; Wong, D.S.H. [National Tsing Hua Univ., Hsinchu (Taiwan, Province of China). Dept. of Chemical Engineering

1999-02-01T23:59:59.000Z

392

Warm H2O and OH in the disk around the Herbig star HD 163296  

E-Print Network [OSTI]

We present observations of far-infrared (50-200 micron) OH and H2O emission of the disk around the Herbig Ae star HD 163296 obtained with Herschel/PACS in the context of the DIGIT key program. In addition to strong [OI] emission, a number of OH doublets and a few weak highly excited lines of H2O are detected. The presence of warm H2O in this Herbig disk is confirmed by a line stacking analysis, enabled by the full PACS spectral scan, and by lines seen in Spitzer data. The line fluxes are analyzed using an LTE slab model including line opacity. The water column density is 10^14 - 10^15 cm^-2, and the excitation temperature is 200-300 K implying warm gas with a density n > 10^5 cm^-3. For OH we find a column density of 10^14 - 2x10^15 cm^-2 and T_ex ~ 300-500 K. For both species we find an emitting region of r ~ 15-20 AU from the star. We argue that the molecular emission arises from the protoplanetary disk rather than from an outflow. This far-infrared detection of both H2O and OH contrasts with near- and mid-...

Fedele, D; van Dishoeck, E F; Herczeg, G J; Evans, N J; Bouwman, J; Henning, Th; Green, J

2012-01-01T23:59:59.000Z

393

Heavily Obscured AGN in Star-Forming Galaxies at z~2  

E-Print Network [OSTI]

We study the properties of a sample of 211 heavily-obscured Active Galactic Nucleus (AGN) candidates in the Extended Chandra Deep Field-South selecting objects with f_24/f_R>1000 and R-K>4.5. Of these, 18 were detected in X-rays and found to be obscured AGN with neutral hydrogen column densities of ~10^23 cm^-2. In the X-ray undetected sample, the following evidence suggests a large fraction of heavily-obscured (Compton Thick) AGN: (i) The stacked X-ray signal of the sample is strong, with an observed ratio of soft to hard X-ray counts consistent with a population of ~90% heavily obscured AGN combined with 10% star-forming galaxies. (ii) The X-ray to mid-IR ratios for these sources are significantly larger than that of star-forming galaxies and ~2 orders of magnitude smaller than for the general AGN population, suggesting column densities of N_H>5x10^24 cm^-2. (iii) The Spitzer near- and mid-IR colors of these sources are consistent with those of the X-ray-detected sample if the effects of dust self-absorptio...

Treister, E; Schawinski, K; Urry, C M; Gawiser, E; Virani, S; Lira, P; Kartaltepe, J; Damen, M; Taylor, E N; Le Floc'h, E; Justham, Stephen; Koekemoer, A

2009-01-01T23:59:59.000Z

394

Nuclear Physics of Neutron Stars  

E-Print Network [OSTI]

Understanding the equation of state (EOS) of cold nuclear matter, namely, the relation between the pressure and energy density, is a central goal of nuclear physics that cuts across a variety of disciplines. Indeed, the limits of nuclear existence, the collision of heavy ions, the structure of neutron stars, and the dynamics of core-collapse supernova, all depend critically on the equation of state of hadronic matter. In this contribution I will concentrate on the special role that nuclear physics plays in constraining the EOS of cold baryonic matter and its impact on the properties of neutron stars.

J. Piekarewicz

2009-01-28T23:59:59.000Z

395

The Cooling of Compact Stars  

E-Print Network [OSTI]

The cooling of a compact star depends very sensitively on the state of dense matter at supranuclear densities, which essentially controls the neutrino emission, as well as on the structure of the stellar outer layers which control the photon emission. Open issues concern the hyperon population, the presence of meson condensates, superfluidity and superconductivity, and the transition of confined hadronic matter to quark matter. This paper describes these issues and presents cooling calculations based on a broad collection of equations of state for neutron star matter and strange matter. These results are tested against the body of observed cooling data.

Dany Page; Ulrich Geppert; Fridolin Weber

2005-08-01T23:59:59.000Z

396

Neutron skins and neutron stars  

SciTech Connect (OSTI)

The neutron-skin thickness of heavy nuclei provides a fundamental link to the equation of state of neutron-rich matter, and hence to the properties of neutron stars. The Lead Radius Experiment ('PREX') at Jefferson Laboratory has recently provided the first model-independence evidence on the existence of a neutron-rich skin in {sup 208}Pb. In this contribution we examine how the increased accuracy in the determination of neutron skins expected from the commissioning of intense polarized electron beams may impact the physics of neutron stars.

Piekarewicz, J. [Department of Physics, Florida State University, Tallahassee, FL 32306-4350 (United States)

2013-11-07T23:59:59.000Z

397

Oil production from thin oil columns subject to water and gas coning  

E-Print Network [OSTI]

OIL PRODUCTION FROM THIN OIL COLUMNS SUBJECT TO MATER AND GAS CONING A Thesis by KMOK KIT CHAI Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE May 1981... Major Subject: Petroleum Engineering OIL PRODUCTION FROM THIN OIL COLUMNS SUBJECT TO WATER AND GAS CONING A Thesis by KWOK KIT CHAI Approved as to style and content by airman of o t ee Member Member Head o Department May 1981 ABSTRACT Oil...

Chai, Kwok Kit

1981-01-01T23:59:59.000Z

398

THERMAL ANALYSIS FOR IN-TANK ION-EXCHANGE COLUMN PROCESS  

SciTech Connect (OSTI)

High Level Waste (HLW) at the Savannah River Site (SRS) is stored in three forms: sludge, saltcake, and supernate. A small column ion-exchange (SCIX) process is being designed to treat dissolved saltcake waste before feeding it to the saltstone facility to be made into grout. The waste is caustic with high concentrations of various sodium salts and lower concentrations of radionuclides. Two cation exchange media being considered are a granular form of crystalline silicotitanate (CST) and a spherical form of resorcinol-formaldehyde (RF) resin. CST is an inorganic material highly selective for cesium that is not elutable. Through this process, radioactive cesium from the salt solution is absorbed into ion exchange media (either CST or RF) which is packed within a flow-through column. A packed column loaded with radioactive cesium generates significant heat from radiolytic decay. If engineering designs cannot handle this thermal load, hot spots may develop locally which could degrade the performance of the ion-exchange media. Performance degradation with regard to cesium removal has been observed between 50 and 80 C for CST [1] and at 65 C for RF resin [2]. In addition, the waste supernate solution will boil around 130 C. If the columns boiled dry, the sorbent material could plug the column and lead to replacement of the entire column module. Alternatively, for organic resins such as RF there is risk of fire at elevated temperatures. The objective of the work is to compute temperature distributions across CST- and RF-packed columns immersed in waste supernate under accident scenarios involving loss of salt solution flow through the beds and, in some cases, loss of coolant system flow. For some cases, temperature distributions are determined as a function of time after the initiation of a given accident scenario and in other cases only the final steady-state temperature distributions are calculated. In general, calculations are conducted to ensure conservative and bounding results for the maximum temperatures achievable using the current baseline column design. This information will assist in SCIX design and facility maintenance.

Lee, S; Frank02 Smith, F

2009-01-05T23:59:59.000Z

399

Equator Appliance: ENERGY STAR Referral (EZ 3720)  

Broader source: Energy.gov [DOE]

DOE referred Equator Appliance clothes washer EZ 3720 to EPA, brand manager of the ENERGY STAR program, for appropriate action after DOE testing revealed that the model does not meet ENERGY STAR requirements.

400

Haier: ENERGY STAR Referral (ESA3087)  

Broader source: Energy.gov [DOE]

DOE referred Haier room air conditioner model ESA3087 to EPA, brand manager of the ENERGY STAR program, for appropriate action after DOE testing revealed that the model does not meet ENERGY STAR requirements.

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


401

Hubble Sees a Neutron Star Alone in Space Nearest Known Neutron Star  

E-Print Network [OSTI]

Hubble Sees a Neutron Star Alone in Space Nearest Known Neutron Star #12;Birth of a Neutron Star In the core, nuclei are smashed into protons & neutrons; the protons combine with electrons to make neutrons & neutrinos. The birth temperature of a neutron star is ~5Ă?1011 K, but neutrino emission cools it to `only

Barnes, Joshua Edward

402

Gas & Stars Aging low-mass stars eject their outer layers.  

E-Print Network [OSTI]

Recycling Gas & Stars #12;Aging low-mass stars eject their outer layers. M57:The Ring Nebula #12;Thor's Emerald Helmet Winds from high-mass stars blow bubbles of hot gas. #12;Supernova blast waves in stars are mixed back into the gas. NGC 6992: Filaments of theVeil Nebula #12;Bubbles blown by high

Barnes, Joshua Edward

403

ENERGY STAR Guide to Retro-Commissioning  

Broader source: Energy.gov [DOE]

ENERGY STAR Guide to Retro-Commissioning gives an overview of RCx and provides detailed project guidance.

404

NuSTAR: Nuclear Spectroscopic Telescope Array  

SciTech Connect (OSTI)

Bill Craig, an astrophysicist at Lawrence Livermore National Laboratory, describes the NASA NuSTAR mission, launched June 13, 2012.

Craig, Bill

2012-06-13T23:59:59.000Z

405

NuSTAR: Nuclear Spectroscopic Telescope Array  

ScienceCinema (OSTI)

Bill Craig, an astrophysicist at Lawrence Livermore National Laboratory, describes the NASA NuSTAR mission, launched June 13, 2012.

Craig, Bill

2014-06-24T23:59:59.000Z

406

The nuclear physics of neutron stars  

SciTech Connect (OSTI)

We explore the unique and fascinating structure of neutron stars. Although neutron stars are of interest in many areas of Physics, our aim is to provide an intellectual bridge between Nuclear Physics and Astrophysics. We argue against the naive perception of a neutron star as a uniform assembly of neutrons packed to enormous densities. Rather, by focusing on the many exotic phases that are speculated to exist in a neutron star, we show how the reality is different and far more interesting.

Piekarewicz, J. [Department of Physics, Florida State University, Tallahassee, FL 32306-4350 (United States)

2014-05-09T23:59:59.000Z

407

Black Stars and Gamma Ray Bursts  

E-Print Network [OSTI]

Stars that are collapsing toward forming a black hole but are frozen near the Schwarzschild horizon are termed ``black stars''. Collisions of black stars, in contrast to black hole collisions, may be sources of gamma ray bursts, whose basic parameters are estimated quite simply and are found to be consistent with observed gamma ray bursts. Black star gamma ray bursts should be preceded by gravitational wave emission similar to that from the coalescence of black holes.

Tanmay Vachaspati

2007-06-08T23:59:59.000Z

408

Is Her X-1 a strange star?  

E-Print Network [OSTI]

The possible identification of Her X-1 with a strange star (Li et al. 1995) is shown to be incorrect.

Jes Madsen

1996-01-23T23:59:59.000Z

409

Kevin E. Trenberth John Fasullo Lesley Smith Trends and variability in column-integrated atmospheric water vapor  

E-Print Network [OSTI]

Kevin E. Trenberth Ă? John Fasullo Ă? Lesley Smith Trends and variability in column. E. Trenberth (&) Ă? J. Fasullo Ă? L. Smith National C

Fasullo, John

410

The Chandrasekhar limit for quark stars  

E-Print Network [OSTI]

The Chandrasekhar limit for quark stars is evaluated from simple energy balance relations, as proposed by Landau for white dwarfs or neutron stars. It has been found that the limit for quark stars depends on, in addition to the fundamental constants, the Bag constant.

Shibaji Banerjee; Sanjay K. Ghosh; Sibaji Raha

2000-01-14T23:59:59.000Z

411

STAR Highlights on Heavy Ion Physics  

E-Print Network [OSTI]

RHIC-STAR is a mid-rapidity collider experiment for studying high energy nuclear collisions. The main physics goals of STAR experiment are 1) studying the properties of the strongly coupled Quark Gluon Plasma, 2) explore the QCD phase diagram structure. In these proceedings, we will review the recent results of heavy ion physics at STAR.

Shusu Shi

2014-09-30T23:59:59.000Z

412

The apsidal motion in close binary stars  

E-Print Network [OSTI]

It is usually accepted to consider an apsidal motion in binary stars as a direct confirmation that a substance inside stars is not uniformly distributed. It is shown in this paper that the apsidal motion in binary systems observation data is in a good agreement with an existence of uniform plasma cores inside stars if they consist of hydrogen-deuterium-helium mixture.

B. V. Vasiliev

2001-10-10T23:59:59.000Z

413

Boson Stars with Nontrivial Topology  

E-Print Network [OSTI]

We construct boson star solutions in the presence of a phantom field, allowing for a nontrivial topology of the solutions. The wormholes residing at the core of the configurations lead to a number of qualitative changes of the boson star solutions. In particular, the typical spiraling dependence of the mass and the particle number on the frequency of the boson stars is lost. Instead, the boson stars with nontrivial topology approach a singular configuration in the limit of vanishing frequency. Depending on the value of the coupling constant, the wormhole geometry changes from a single throat configuration to a double throat configuration, featuring a belly inbetween the two throats. Depending on the mass of the boson field and its self-interaction, the mass and the size of these objects cover many orders of magnitude, making them amenable to various astrophysical observations. A stability analysis reveals, that the unstable mode of the Ellis wormhole is retained in the presence of the bosonic matter. However, the negative eigenvalue can get very close to zero, by tuning the parameters of the self-interaction potential appropriately.

Vladimir Dzhunushaliev; Vladimir Folomeev; Christian Hoffmann; Burkhard Kleihaus; Jutta Kunz

2014-09-24T23:59:59.000Z

414

Star Formation and Galaxy Environment  

E-Print Network [OSTI]

The dependence of star formation rate on galaxian environment is a key issue in the understanding of galaxy formation and evolution. However, the study of this subject is complex and observationally challenging. This paper reviews some of the current results, drawing mostly from recent large redshift surveys such the LCRS, the MORPH collaboration, and the CNOC1 and CNOC2 redshift surveys.

H. K. C. Yee

2000-04-05T23:59:59.000Z

415

Torsional oscillations of strange stars  

E-Print Network [OSTI]

Strange stars are one of the hypothetical compact stellar objects that can be formed after a supernova explosion. The existence of these objects relies on the absolute stability of strange {\\it collapsed} quark matter with respect to standard nuclear matter. We discuss simple models of strange stars with a bare quark matter surface, thus standard nuclear matter is completely absent. In these models an electric dipole layer a few hundreds Fermi thick should exist close to the star surface. Studying the torsional oscillations of the electrically charged layer we estimate the emitted power, finding that it is of the order of $10^{45}$ erg/s, meaning that these objects would be among the brightest compact sources in the heavens. The associated relaxation times are very uncertain, with values ranging between microseconds and minutes, depending on the crust thickness. Although part of the radiated power should be absorbed by the electrosphere surrounding the strange star, a sizable fraction of photons should escape and be detectable.

Massimo Mannarelli

2014-09-12T23:59:59.000Z

416

BPS Skyrmions as neutron stars  

E-Print Network [OSTI]

The BPS Skyrme model has been demonstrated already to provide a physically intriguing and quantitatively reliable description of nuclear matter. Indeed, the model has both the symmetries and the energy-momentum tensor of a perfect fluid, and thus represents a field theoretic realization of the "liquid droplet" model of nuclear matter. In addition, the classical soliton solutions together with some obvious corrections (spin-isospin quantization, Coulomb energy, proton-neutron mass difference) provide an accurate modeling of nuclear binding energies for heavier nuclei. These results lead to the rather natural proposal to try to describe also neutron stars by the BPS Skyrme model coupled to gravity. We find that the resulting self-gravitating BPS Skyrmions provide excellent results as well as some new perspectives for the description of bulk properties of neutron stars when the parameter values of the model are extracted from nuclear physics. Specifically, the maximum possible mass of a neutron star before black-hole formation sets in is a few solar masses, the precise value depending on the precise values of the model parameters, and the resulting neutron star radius is of the order of 10 km.

C. Adam; C. Naya; J. Sanchez-Guillen; R. Vazquez; A. Wereszczynski

2014-07-14T23:59:59.000Z

417

Dark Stars: the First Stars in the Universe may be powered by Dark Matter Heating  

E-Print Network [OSTI]

A new line of research on Dark Stars is reviewed, which suggests that the first stars to exist in the universe were powered by dark matter heating rather than by fusion. Weakly Interacting Massive Particles, which may be there own antipartmers, collect inside the first stars and annihilate to produce a heat source that can power the stars. A new stellar phase results, a Dark Star, powered by dark matter annihilation as long as there is dark matter fuel.

Katherine Freese; Peter Bodenheimer; Paolo Gondolo; Douglas Spolyar

2008-12-28T23:59:59.000Z

418

Air Quality Scoping Study for Sarcobatus Flat, Nevada (EMSI April 2007)  

SciTech Connect (OSTI)

The Desert Research Institute (DRI) is performing a scoping study as part of the U.S. Department of Energy’s Yucca Mountain Environmental Monitoring Systems Initiative (EMSI). The main objective is to obtain baseline air quality information for Yucca Mountain and an area surrounding the Nevada Test Site (NTS). Air quality and meteorological monitoring and sampling equipment housed in a mobile trailer (shelter) is collecting data at seven sites outside the NTS, including Ash Meadows National Wildlife Refuge, Sarcobatus Flat, Beatty, Rachel, Caliente, Pahranagat National Wildlife Refuge, and Crater Flat, and at four sites on the NTS. The trailer is stationed at any one site for approximately eight weeks at a time. Letter reports provide summaries of air quality and meteorological data, on completion of each site’s sampling program.

Johann Engelbrecht, Ilias Kavouras, Dave Campbell, Scott Campbell, Steven Kohl and David Shafer

2007-04-01T23:59:59.000Z

419

The marriage of RCRA and CERCLA at the Rocky Flats Environmental Technology Site  

SciTech Connect (OSTI)

A key goal of the Rocky Flats Cleanup Agreement (RFCA) signed in July of 1996 was to provide a seamless marriage of the Resource Conservation and Recovery Act (RCRA) (and other media specific programs) and the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA) and the implementing agencies of each. This paper examines the two years since the signing of RFCA and identifies the successes, failures, and stresses of the marriage. RFCA has provided an excellent vehicle for regulatory and substantive progress at the Department of Energy`s Rocky Flats facility. The key for a fully successful marriage is to build on the accomplishments to date and to continually improve the internal and external systems and relationships. To date, the parties can be proud of both the substantial accomplishment of substantive environmental work and the regulatory systems that have enabled the work.

Shelton, D.C.; Brooks, L.M.

1998-11-01T23:59:59.000Z

420

Rocky Flats Environmental Technology Site Ecological Monitoring Program 1995 annual report  

SciTech Connect (OSTI)

The Ecological Monitoring Program (ECMP) was established at the Rocky Flats Environmental Technology Site (Site) in September 1992. At that time, EcMP staff developed a Program Plan that was peer-reviewed by scientists from western universities before submittal to DOE RFFO in January 1993. The intent of the program is to measure several quantitative variables at different ecological scales in order to characterize the Rocky Flats ecosystem. This information is necessary to document ecological conditions at the Site in impacted and nonimpacted areas to determine if Site practices have had ecological impacts, either positive or negative. This information can be used by managers interested in future use scenarios and CERCLA activities. Others interested in impact analysis may also find the information useful. In addition, these measurements are entered into a database which will serve as a long-term information repository that will document long-term trends and potential future changes to the Site, both natural and anthropogenic.

NONE

1995-05-31T23:59:59.000Z

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


421

Project plan: Procedure system design for the Rocky Flats Plant Emergency Preparedness Program  

SciTech Connect (OSTI)

This procedure system is being designed for the Rocky Flats Plant Emergency Preparedness Program (EPP) to: assess the procedural needs of the Emergency Preparedness Program in light of the existing Rocky Flats Plant policies, plans, procedures, and applicable DOE orders; design the structure of the Emergency Preparedness Program procedural system based on the classes of procedures needed, the types of procedures (procedures vs job outline), the sections of procedures required, and the timetable for procedure maintenance; develop boiler plate formats for the various authors in writing the necessary standardized procedures; develop a list of all the necessary procedures that must be produced for Emergency Preparedness Program; and provide consistency for department-wide activities relating to the quality control in writing, distribution, and revising procedures for Emergency Preparedness Program. 23 refs., 18 figs.

Hodgin, C.R.; Brown-Strattan, M.

1989-10-01T23:59:59.000Z

422

Flat panel display using Ti-Cr-Al-O thin film  

DOE Patents [OSTI]

Thin films of Ti--Cr--Al--O are used as a resistor material. The films are rf sputter deposited from ceramic targets using a reactive working gas mixture of Ar and O.sub.2. Resistivity values from 10.sup.4 to 10.sup.10 Ohm-cm have been measured for Ti--Cr--Al--O film <1 .mu.m thick. The film resistivity can be discretely selected through control of the target composition and the deposition parameters. The application of Ti--Cr--Al--O as a thin film resistor has been found to be thermodynamically stable, unlike other metal-oxide films. The Ti--Cr--Al--O film can be used as a vertical or lateral resistor, for example, as a layer beneath a field emission cathode in a flat panel display; or used to control surface emissivity, for example, as a coating on an insulating material such as vertical wall supports in flat panel displays.

Jankowski, Alan F. (Livermore, CA); Schmid, Anthony P. (Solan Beach, CA)

2002-01-01T23:59:59.000Z

423

Fatigue damage accumulation and property degradation in flat versus cylindrical specimens  

E-Print Network [OSTI]

Material E? MPa l. 39E5 (20. 2 msi) 7. 24E3 (1. 05 msi) 6. 89E-11 (1. 0E-8 psi) Ezz MPa 9. 17E3 (1. 33 msi) 7. 24E3 (1. 05 msi) 6. 89E-11 (1. 0E-8 psi) &? 0. 3 0. 2 0. 5 MPB 7. 10E3 (1. 03 msi) 7. 10E3 (1. 03 msi) 6. 89E-11 (1.... OE-8 psi) MPa 7. 10E3 (1. 03 msi) 7. 10E3 (1. 03 msi) 6. 89E-11 (1. OE-8 psi) Grs MPa 7. 10E3 (1. 03 msi) 7. 10E3 (1. 03 msi) 6. 89E-11 (1. 0E-8 psi) 3. 2 Flat Coupons Two analyses were performed on flat coupons using CLASS...

Andrews, Kristine Bachtel

1992-01-01T23:59:59.000Z

424

Rocky Flats Plant fluidized-bed incinerator. Engineering design and reference manual  

SciTech Connect (OSTI)

The information in this manual is being presented to complete the documentation of the fluidized-bed incineration (FBI) process development at the Rocky Flats Plant. The information pertains to the 82-kg/hour demonstration unit at the Rocky Flats Plant. This document continues the presentation of design reference material in the aeas of equipment drawings, space requirements, and unit costs. In addition, appendices contain an operating procedure and an operational safety analysis of the process. The cost figures presented are based on 1978 dollars and have not been converted to a current dollar value. Also, the cost of modifications are not included, since they would be insignificant if they were incorporated into a new installation.

Meile, L.J.

1982-11-05T23:59:59.000Z

425

Effects of self-assembled monolayer and PFPE lubricant on wear characteristics of flat silicon tips.  

SciTech Connect (OSTI)

The effects of self-assembled monolayer (SAM) and perfluoropolyether (PFPE) lubricant on the wear characteristics of flat silicon tips were investigated. The wear test consisted of sliding the silicon tips fabricated on a flat silicon specimen against SAM and PFPE (Z-tetraol) coated silicon (100) wafer. The tips were slid at a low speed for about 15 km under an applied load of 39.2 {micro}N. The wear volume of the tip was obtained by measuring the tip profile using an Atomic Force Microscope (AFM). It was found that the coatings were effective in reducing the wear of the tips by an order of magnitude from 10{sup -6} to 10{sup -7}.

Kim, H. J.; Jang, C. E.; Kim, D. E.; Kim, Y. K.; Choa, S. H.; Hong, S.; Materials Science Division; Yonsei Univ.; Samsung Adv. Inst. Science and Technology; Seoul National Univ. of Technology

2009-01-01T23:59:59.000Z

426

Constraining global isoprene emissions with Global Ozone Monitoring Experiment (GOME) formaldehyde column measurements  

E-Print Network [OSTI]

Constraining global isoprene emissions with Global Ozone Monitoring Experiment (GOME) formaldehyde emission estimates are highly uncertain because of a lack of direct observations. Formaldehyde (HCHO the observation of this trace gas to help constrain isoprene emissions. We use HCHO column observations from

Chance, Kelly

427

Mapping isoprene emissions over North America using formaldehyde column observations from space  

E-Print Network [OSTI]

Mapping isoprene emissions over North America using formaldehyde column observations from space. [1] We present a methodology for deriving emissions of volatile organic compounds (VOC) using space to local VOC emissions, with a spatial smearing that increases with the VOC lifetime. Isoprene

Chance, Kelly

428

Department of Mechanical Engineering Spring 2011 Liquid Nitrogen Packed Column Distributor Design  

E-Print Network [OSTI]

Distributor Design Overview Air Products and Chemicals Inc. tasked the design team to come up with new with Air Products and SJTU, the team developed a final concept and then modeled the distributor design distillation column design. Approach The design team first gathered customer specifications from Air Products

Demirel, Melik C.

429

Biodegradation of jet fuel in vented columns of water-unsaturated sandy soil. Master's thesis  

SciTech Connect (OSTI)

The effect of soil water content on the rate of jet fuel (JP-4) biodegradation in air-vented, water-unsaturated columns of sandy soil was investigated. The contaminated soil was obtained from a spill site located on Tyndall AFB, Fla. The initial soil loading was 4590 mg of JP-4/kg of dry soil. Three laboratory columns were packed with the contaminated soil, saturated and drained for periods of 81-89 days. Two columns were continuously vented with air, and the third, intended to provide an anaerobic control, was vented with nitrogen. The venting gas flows were maintained between 1 and 2.5 soil pore volume changeouts per day. The total JP-4 removal in the air-vented columns averaged 44% of the mass originally present. Biodegradation and volatilization accounted for 93% and 7% of the total removal, respectively. A maximum biodegradation rate of 14.3 mg of JP-4/kg of moist soil per day was observed at a soil water content of approximately 72% saturation. Soil drainage characteristics indicated that this water content may have corresponded to 100% of the in situ field capacity water content. Theses.

Coho, J.W.

1990-01-01T23:59:59.000Z

430

Chemical Reduction of PCE by Zero Valent Iron Colloids Batch and Column Experiments  

E-Print Network [OSTI]

Chemical Reduction of PCE by Zero Valent Iron Colloids ­ Batch and Column Experiments Motivation nm NAPASAN Particle - nZVI / PCE-Solution 0 20 40 60 80 100 120 140 0 2 4 6 8 10 12 14 16 18 20 22 24H[-] PCE - Inflow PCE - Outflow TCE - Inflow TCE - Outflow Chloride - Outflow Blank Value Chloride pH Value

Cirpka, Olaf Arie

431

Protocol for GL spin columns p10, 200ug capacity. p200, 600ug capacity.  

E-Print Network [OSTI]

Protocol for GL spin columns p10, 200ug capacity. p200, 600ug capacity. Glscienceinc.com product tips (exact protocol from GL Sciences): 1. Bring samples up in 65 uL of Buffer A. 2. Condition a. Add

Richardson, David

432

VOC recovery using microwave regeneration of adsorbents: Pilot-column studies  

SciTech Connect (OSTI)

A pilot-scale column was constructed to evaluate the technical feasibility of microwave (MW) heating as a means of regenerating adsorbents for recovery of volatile organic compounds (VOCs). The 6 inch diameter moving-bed column, which has a throughput capacity of 200 lb/hr of adsorbent, is representative of a full-scale component of a small-capacity recovery system or a single element of a large-capacity system. Regeneration experiments were conducted to study the effects of key process variables, including adsorbent and stripping gas feed rates, initial adsorbent coverage and microwave power input, on column performance. Two adsorbents with contrasting dielectric loss characteristics were studied, Dowex Optipore L502 (low dielectric loss styrene-based) and Rohm and Haas Ambersorb 600 (moderate dielectric loss carbonaceous). Adsorbates included polar and nonpolar compounds: isopropyl alcohol (iPA), methyl ethyl ketone (MEK) and toluene. Solvent recovery rates of 20--30 lbs/hr were achieved. The results of the pilot-column experiments demonstrate that axial temperature and desorption profiles are dependent on the dielectric characteristics of the adsorbent/sorbate pair, and that final regeneration coverage can be correlated with a dimensionless stripping gas ratio and final adsorbent temperature. Implications for design of microwave-regenerated VOC recovery systems are discussed.

Salinas, M.J.; Price, D.W.; Schmidt, P.S.

1999-07-01T23:59:59.000Z

433

A simple column model to explore anticipated problems in variational assimilation of satellite observations  

E-Print Network [OSTI]

A simple column model to explore anticipated problems in variational assimilation of satellite Office, Exeter, UK Abstract We investigate a simplified form of variational data assimilation in a fully of nonlinearity become non-negligible in the variational data assimilation algorithm. A careful analysis

Roulstone, Ian

434

Local instability of certain 18-8 stainless steel thin sheet metal columns  

E-Print Network [OSTI]

o ". &e cross~ac', ?ion in its oi&n pl in& ~ Ms i. , u &nally faced in short columns, 1&is invo ti, "ion ia conco&siod onl~. , &?LGh accoi&dcr~. Z&ilurc, o. ii, is aonetiaea c. . le&. . '. , loc;!1 b. ?n&linI;, 'he object o ' t&. ia i!!v;. i...

McClendon, E. W

2012-06-07T23:59:59.000Z

435

Integrated Column Designs for Minimum Energy and Entropy Requirements in Multicomponent Distillation  

E-Print Network [OSTI]

prefer a process where the energy may be supplied at a low temperature and cooling may be supplied law). This leads us to the reversible Petlyuk arrangement. However the total required heat supply). A characteristic of the reversible distillation column is that some of the heat is supplied continuously along

Skogestad, Sigurd

436

Dynamic RadiativeConvective Equilibria Using GCM Column Physics ISAAC M. HELD  

E-Print Network [OSTI]

Dynamic Radiative­Convective Equilibria Using GCM Column Physics ISAAC M. HELD NOAA and Oceanic Sciences, Department of Geosciences, Princeton University, Princeton, New Jersey BRUCE WYMAN NOAA author address: Dr. Isaac M. Held, NOAA/Geo- physical Fluid Dynamics Laboratory, Princeton University

437

Lyman $?$ Absorption as a Sensitive Probe of the H I Column in Cooling Flows  

E-Print Network [OSTI]

X-ray spectra of a significant fraction of cooling flow (CF) clusters of galaxies indicate the presence of a large column of ``cold'' absorbing gas. The physical nature of the absorbing medium remains a mystery. Searches for H I absorption using the 21 cm hyperfine structure line yielded null results in most cases. The purpose of this contribution is to point out that the Lyman $\\alpha$ absorption cross section is ~10^7 times larger than for the 21 cm line, it can therefore be used as a very sensitive probe of the H I column in clusters, and can thus place stringent constraints on the nature of the X-ray absorber. This method is applied to the Perseus CF cluster where a medium resolution (~250 km/s) UV spectrum is available. The upper limit on the H I column obtained using Lyman $\\alpha$ is at least ~50 times smaller than the 21 cm detection, and ~5,000 smaller than implied by X-ray spectra, indicating that the X-ray absorber is exceedingly devoid of H I. Higher resolution UV spectra with HST may improve the H I column limits by an additional factor of ~4,000. This method can be applied to strongly constrain the nature of the X-ray absorbing medium in a significant fraction of CF clusters .

Ari Laor

1996-09-24T23:59:59.000Z

438

HiTrap Affinity columns HiTrap Wheat Germ Lectin, 1 ml INSTRUCTIONS  

E-Print Network [OSTI]

be operated with a syringe, peristaltic pump or a chromatography system. Buffer preparation Water. The column can be operated with a syringe, peristaltic pump or liquid chromatography system such as Ă?KTATM for HiTrap Wheat Germ Lectin include separation and purification of glycoproteins and polysaccharides

Lebendiker, Mario

439

A Study on Transverse Vibrations in a Column and an Overview of Structural Control  

E-Print Network [OSTI]

of the structure or of specific members to reduce the vibratory responses. It is vital to understand the behavior of the structural members experiencing the vibrations before being able to monitor and control them. Mode shapes show the different movement of columns...

Roldan Arcos, Alejandra 1990-

2011-07-19T23:59:59.000Z

440

Design of Extraction Column Methanol Recovery System for the TAME Reactive Distillation Process  

E-Print Network [OSTI]

, methanol recovery 1. Introduction A process of producing TAME via reactive distillation has been presented the bulk of the reaction between C5 and methanol to produce TAME and a reactive distillation. MethanolDesign of Extraction Column Methanol Recovery System for the TAME Reactive Distillation Process

Al-Arfaj, Muhammad A.

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


441

Control structure selection for the deethanizer column from Mongstad/Statoil  

E-Print Network [OSTI]

the maxi- mum allowed concentrations of C3 in the distillate is 10% (mol fraction) and the maximum concen, Sigurd Skogestad April 27, 2007 Abstract The selection of a good control structure for a distillation, it is studied the control structure selection of a deethanizer distillation column from Mongstad

Skogestad, Sigurd

442

CHEMICAL ENGINEERING Page 1 of 10 PRE-REQUISITES are listed in this column.  

E-Print Network [OSTI]

be substituted with approval of the Chemical and Petroleum Engineering department and the relevant departmentCHEMICAL ENGINEERING Page 1 of 10 1st YEAR PRE-REQUISITES are listed in this column. CO. All complementary studies courses must be taken prior to graduation. Chemical Engineering: Regular

Calgary, University of

443

Column Studies of Anaerobic Carbon Tetrachloride Biotransformation with Hanford Aquifer Material  

E-Print Network [OSTI]

Column Studies of Anaerobic Carbon Tetrachloride Biotransformation with Hanford Aquifer Material bioremediation of carbon tetrachloride (CT) at the Hanford site in south- central Washington state. Benzoate in south- central Washington state has been a defense materials pro- duction complex since 1943. Carbon

Semprini, Lewis

444

Global inventory of nitrogen oxide emissions constrained by space-based observations of NO2 columns  

E-Print Network [OSTI]

Global inventory of nitrogen oxide emissions constrained by space-based observations of NO2 columns NO + NO2), and combine these with a priori information from a bottom- up emission inventory (with error and a factor of 2 over remote regions. We derive a top-down NOx emission inventory from the GOME data by using

Chance, Kelly

445

Lignin biomarkers as tracers of mercury sources in lakes water column  

E-Print Network [OSTI]

Lignin biomarkers as tracers of mercury sources in lakes water column Jean-Franc¸ois Ouellet � Marc the autochthonous from the allochthonous organic matter (OM), lignin derived biomarker signa- tures [Lambda, S/V, C/V, P/(V ? S), 3,5-Bd/V and (Ad/Al)v] were used. Since lignin is exclusively produced by terrigenous

Long, Bernard

446

Circular and Square Concrete Columns Externally Confined by CFRP Composite: Experimental  

E-Print Network [OSTI]

testing of the FRP composite. In existing models for FRP-confined concrete, it is commonly assumedChapter 6 Circular and Square Concrete Columns Externally Confined by CFRP Composite: Experimental limited. This field remains in its developmental stages and more testing and analysis are needed

Boyer, Edmond

447

Black-Box Identification for PLC based MPC of a Binary Distillation Column  

E-Print Network [OSTI]

Black-Box Identification for PLC based MPC of a Binary Distillation Column B. Huyck ,, F. Logist J is to upgrade the control system with a linear MPC running on a PLC. However, before a model based controller can be used on a PLC, an accurate (but simple) process model has to be constructed. Hence, the aim

448

388 Biomedical Instrumentation & Technology September/October 2011 Columns and Departments  

E-Print Network [OSTI]

388 Biomedical Instrumentation & Technology September/October 2011 Columns and Departments When) as a biomedical equipment technician in 1999, he remembers being presented with the organization's strategic plan written permission from AAMI. #12;389Biomedical Instrumentation & Technology September/October 2011

Hayden, Nancy J.

449

ADVANCED DIAGNOSTIC TECHNIQUES FOR THREE-PHASE SLURRY BUBBLE COLUMN REACTORS(SBCR)  

SciTech Connect (OSTI)

This report summarizes the accomplishment made during the third year of this cooperative research effort between Washington University, Ohio State University and Air Products and Chemicals. Data processing of the performed Computer Automated Radioactive Particle Tracking (CARPT) experiments in 6 inch column using air-water-glass beads (150 {micro}m) system has been completed. Experimental investigation of time averaged three phases distribution in air-Therminol LT-glass beads (150 {micro}m) system in 6 inch column has been executed. Data processing and analysis of all the performed Computed Tomography (CT) experiments have been completed, using the newly proposed CT/Overall gas holdup methodology. The hydrodynamics of air-Norpar 15-glass beads (150 {micro}m) have been investigated in 2 inch slurry bubble column using Dynamic Gas Disengagement (DGD), Pressure Drop fluctuations, and Fiber Optic Probe. To improve the design and scale-up of bubble column reactors, a correlation for overall gas holdup has been proposed based on Artificial Neural Network and Dimensional Analysis.

M.H. Al-Dahhan; L.S. Fan; M.P. Dudukovic

2002-07-25T23:59:59.000Z

450

ON THE INITIAL MASS FUNCTION OF LOW-METALLICITY STARS: THE IMPORTANCE OF DUST COOLING  

SciTech Connect (OSTI)

The first stars to form in the universe are believed to have distribution of masses biased toward massive stars. This contrasts with the present-day initial mass function, which has a predominance of stars with masses lower than 1 M{sub Sun }. Therefore, the mode of star formation must have changed as the universe evolved. Such a transition is attributed to a more efficient cooling provided by increasing metallicity. Especially dust cooling can overcome the compressional heating, which lowers the gas temperature thus increasing its instability to fragmentation. The purpose of this paper is to verify if dust cooling can efficiently cool the gas, and enhance the fragmentation of gas clouds at the early stages of the universe. To confirm that, we calculate a set of hydrodynamic simulations that include sink particles, which represent contracting protostars. The thermal evolution of the gas during the collapse is followed by making use of a primordial chemical network and also a recipe for dust cooling. We model four clouds with different amounts of metals (10{sup -4}, 10{sup -5}, 10-6 Z{sub Sun }, and 0), and analyze how this property affect the fragmentation of star-forming clouds. We find evidence for fragmentation in all four cases, and hence conclude that there is no critical metallicity below which fragmentation is impossible. Nevertheless, there is a clear change in the behavior of the clouds at Z {approx}< 10{sup -5} Z{sub Sun }, caused by the fact that at this metallicity, fragmentation takes longer to occur than accretion, leading to a flat mass function at lower metallicities.

Dopcke, Gustavo [Member of the International Max Planck Research School for Astronomy and Cosmic Physics at the University of Heidelberg, IMPRS-HD, Germany. (Germany)] [Member of the International Max Planck Research School for Astronomy and Cosmic Physics at the University of Heidelberg, IMPRS-HD, Germany. (Germany); Glover, Simon C. O.; Clark, Paul C.; Klessen, Ralf S., E-mail: gustavo@uni-hd.de [Zentrum fuer Astronomie, Institut fuer Theoretische Astrophysik, Universitaet Heidelberg, Albert-Ueberle-Str. 2, D-69120 Heidelberg (Germany)

2013-04-01T23:59:59.000Z

451

C2D Spitzer-IRS spectra of disks around T Tauri stars: I. Silicate emission and grain growth  

E-Print Network [OSTI]

Infrared ~5--35 um spectra for 40 solar-mass T Tauri stars and 7 intermediate-mass Herbig Ae stars with circumstellar disks were obtained using the Spitzer Space Telescope as part of the c2d IRS survey. This work complements prior spectroscopic studies of silicate infrared emission from disks, which were focused on intermediate-mass stars, with observations of solar-mass stars limited primarily to the 10 um region. The observed 10 and 20 um silicate feature strengths/shapes are consistent with source-to-source variations in grain size. A large fraction of the features are weak and flat, consistent with um-sized grains indicating fast grain growth (from 0.1--1.0 um in radius). In addition, approximately half of the T Tauri star spectra show crystalline silicate features near 28 and 33 um indicating significant processing when compared to interstellar grains. A few sources show large 10-to-20 um ratios and require even larger grains emitting at 20 um than at 10 um. This size difference may arise from the difference in the depth into the disk probed by the two silicate emission bands in disks where dust settling has occurred. The 10 um feature strength vs. shape trend is not correlated with age or Halpha equivalent width, suggesting that some amount of turbulent mixing and regeneration of small grains is occurring. The strength vs. shape trend is related to spectral type, however, with M stars showing significantly flatter 10 um features (larger grain sizes) than A/B stars. The connection between spectral type and grain size is interpreted in terms of the variation in the silicate emission radius as a function of stellar luminosity, but could also be indicative of other spectral-type dependent factors (e.g, X-rays, UV radiation, stellar/disk winds, etc.).

J. E. Kessler-Silacci; J. -C. Augereau; C. P. Dullemond; V. Geers; F. Lahuis; N. J. Evans II; E. F. van Dishoeck; G. A. Blake; A. C. A. Boogert; J. Brown; J. K. Jorgensen; C. Knez; K. M. Pontoppidan

2005-11-02T23:59:59.000Z

452

Proceedings of the flat-plate solar array project research forum on photovoltaic metallization systems  

SciTech Connect (OSTI)

A Photovoltaic Metallization Research Forum, under the sponsorship of the Jet Propulsion Laboratory's Flat-Plate Solar Array Project and the US Department of Energy, was held March 16-18, 1983 at Pine Mountain, Georgia. The Forum consisted of five sessions, covering (1) the current status of metallization systems, (2) system design, (3) thick-film metallization, (4) advanced techniques and (5) future metallization challenges. Twenty-three papers were presented.

None

1983-11-15T23:59:59.000Z

453

The distortion of a uniform flow field due to a finite flat plate  

E-Print Network [OSTI]

Advantages of the Application of the Complete Navier-Stokes Equations Synopsis II ANALYSIS The Physical Model The Mathematical Model Governing Differential Fquations Initial and Boundary Conditions 10 III METHOD OF SOLUTION 19 General Method... INTRODUCTION Pur ose and Sco e The purpose of this study is to apply numerical methods to solve the exact partial differential equations governing viscous fluid flow past a finite flat plate. The flow condition studied is that of time-dependent, two...

Zull, Lawrence Michael

1970-01-01T23:59:59.000Z

454

Oil springs and flat top anticlines, Carbon County Wyoming: An unusual fold pair  

SciTech Connect (OSTI)

Oil Springs Anticline, northwest of Medicine Bow, Wyoming, and located at the northeast corner of the Hanna Basin, lies near the junction of the Freezeout Hills Anticline, the Shirley thrust fault and the Flat Top Anticline. The surface fold as defined by the outcrop of the Wall Creek Sandstone Member of the Frontier Formation is disharmonic to deeper structure at the level of the Jurassic Sundance Formation. The fold is wedged between two major folds and is the result of a space problem between larger structural elements. The controlling Flat Top Anticline is an excellent example of a fold controlled by a well constrained fault in the Precambrian crystalline basement. The basement is bowed upward and outward to the northwest in the hanging wall of the Flat Top Anticline. The purpose of this paper is to describe the geologic structure of the Oil Springs and Flat Top anticlines and their relationship to the Freezeout Hills and the Hanna Basin. Commercial production of petroleum and natural gas occurs on the west flank of the Laramie-Cooper Lake Basin as far north as the northeast corner of the Hanna Basin. Stone reviewed the producing formations in the Laramie and eastern Hanna basins and noted that 11 commercial accumulations of petroleum and natural gas are directly related to anticlinal structures. Production derived from the Permian-Pennsylvanian Tensleep Sandstone in this region has a special geologic framework. Fields that produce from the Tensleep Sandstone are well defined anticlines bounded by faults or fault systems, a situation also reported by Biggs and Espach, Blackstone and in the Wyoming Geological Association Symposium. The Tensleep Sandstone reservoirs in these faulted anticlines are in juxtaposition to potential source rocks of either Jurassic or Cretaceous age in the footwalls of the faults. 17 refs., 9 figs., 1 tab.

Blackstone, D.L. Jr. (Univ. of Wyoming, Laramie, WY (United States))

1994-04-01T23:59:59.000Z

455

Historical Exposures to Chemicals at the Rocky Flats Nuclear Weapons Plant: A Pilot Retrospective Exposure Assessment  

SciTech Connect (OSTI)

In a mortality study of white males who had worked at the Rocky Flats Nuclear Weapons Plant between 1952 and 1979, an increased number of deaths from benign and unspecified intracranial neoplasms was found. A case-control study nested within this cohort investigated the hypothesis that an association existed between brain tumor death and exposure to either internally deposited plutonium or external ionizing radiation. There was no statistically significant association found between estimated radiation exposure from internally deposited plutonium and the development of brain tumors. Exposure by job or work area showed no significant difference between the cohort and the control groups. An update of the study found elevated risk estimates for (1) all lymphopoietic neoplasms, and (2) all causes of death in employees with body burdens greater than or equal to two nanocuries of plutonium. There was an excess of brain tumors for the entire cohort. Similar cohort studies conducted on worker populations from other plutonium handling facilities have not yet shown any elevated risks for brain tumors. Historically, the Rocky Flats Nuclear Weapons Plant used large quantities of chemicals in their production operations. The use of solvents, particularly carbon tetrachloride, was unique to Rocky Flats. No investigation of the possible confounding effects of chemical exposures was done in the initial studies. The objectives of the present study are to (1) investigate the history of chemical use at the Rocky Flats facility; (2) locate and analyze chemical monitoring information in order to assess employee exposure to the chemicals that were used in the highest volume; and (3) determine the feasibility of establishing a chemical exposure assessment model that could be used in future epidemiology studies.

Janeen Denise Robertson

1999-02-01T23:59:59.000Z

456

A determination of the power absorbed by flat disks rotating in a liquid  

E-Print Network [OSTI]

A DETERMINATION OF THE POWER ABSORBED BY FLAT DISKS ROTATING IN A LIQUID A Thesis JOHN ROBERT NASSEY Approved as to style and content by Chairman of Committee ~c, Pr. ~ ~a ~- Head of De@'artment of Mechanical Engineering A DETERMINATION... August l952 Ma)or Sub]ectt Mechanical Engineering AC KIOWLEDOWEKT The writer wishes to express appreciation for advice and enoouragement reoeived during the preparation of this thesis from Professors E, S. Holdredge and R. M. Wlngren, TABLF. OF CO...

Massey, John Robert

1952-01-01T23:59:59.000Z

457

Exact solutions to Elko spinors in spatially flat Friedmann-Robertson-Walker spacetimes  

E-Print Network [OSTI]

In this paper we present exact solutions to the so-called Elko spinors for three models of expanding universe, namely the de Sitter, linear and the radiation type evolution. The study was restrict to flat, homogeneous and isotropic Friedmann-Robertson-Walker backgrounds. Starting with an Elko spinor we present the solutions for these cases and compared to the case of Dirac spinors. Besides, an attempt to use Elko spinors as a dark energy candidate in the cosmological context is investigated.

J. M. Hoff da Silva; S. H. Pereira

2014-03-06T23:59:59.000Z

458

Property:OpenEI/UtilityRate/FlatDemandMonth4 | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia: Energy ResourcesLoadingPenobscotInformation Max Jump to:FlatDemandMonth3 Jump to: navigation, search This

459

Property:OpenEI/UtilityRate/FlatDemandMonth5 | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia: Energy ResourcesLoadingPenobscotInformation Max Jump to:FlatDemandMonth3 Jump to: navigation, search

460

Property:OpenEI/UtilityRate/FlatDemandMonth6 | Open Energy Information  

Open Energy Info (EERE)

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461

Property:OpenEI/UtilityRate/FlatDemandMonth7 | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia: Energy ResourcesLoadingPenobscotInformation Max Jump to:FlatDemandMonth3 Jump to:

462

The variability properties of X-ray steep and X-ray flat quasars  

E-Print Network [OSTI]

We have studied the variability of 6 low redshift, radio quiet `PG' quasars on three timescales (days, weeks, and months) using the ROSAT HRI. The quasars were chosen to lie at the two extreme ends of the ROSAT PSPC spectral index distribution and hence of the H$\\beta$ FWHM distribution. The observation strategy has been carefully designed to provide even sampling on these three basic timescales and to provide a uniform sampling among the quasars We have found clear evidence that the X-ray steep, narrow H_beta, quasars systematically show larger amplitude variations than the X-ray flat broad H_beta quasars on timescales from 2 days to 20 days. On longer timescales we do not find significant differences between steep and flat quasars, although the statistics are poorer. We suggest that the above correlation between variability properties and spectral steepness can be explained in a scenario in which the X-ray steep, narrow line objects are in a higher L/L_Edd state with respect to the X-ray flat, broad line objects. We evaluated the power spectrum of PG1440+356 (the brigthest quasar in our sample) between 2E-7 and 1E-3 Hz, where it goes into the noise. The power spectrum is roughly consistent with a 1/f law between 1E-3 and 2E-6 Hz. Below this frequency it flattens significantly.

Fabrizio Fiore; Ari Laor; Martin Elvis; Fabrizio Nicastro; Emanuele Giallongo

1998-03-20T23:59:59.000Z

463

Small-Column Cesium Ion Exchange Elution Testing of Spherical Resorcinol-Formaldehyde  

SciTech Connect (OSTI)

This report summarizes the work performed to evaluate multiple, cesium loading, and elution cycles for small columns containing SRF resin using a simple, high-level waste (HLW) simulant. Cesium ion exchange loading and elution curves were generated for a nominal 5 M Na, 2.4E-05 M Cs, 0.115 M Al loading solution traced with 134Cs followed by elution with variable HNO3 (0.02, 0.07, 0.15, 0.23, and 0.28 M) containing variable CsNO3 (5.0E-09, 5.0E-08, and 5.0E-07 M) and traced with 137Cs. The ion exchange system consisted of a pump, tubing, process solutions, and a single, small ({approx}15.7 mL) bed of SRF resin with a water-jacketed column for temperature-control. The columns were loaded with approximately 250 bed volumes (BVs) of feed solution at 45 C and at 1.5 to 12 BV per hour (0.15 to 1.2 cm/min). The columns were then eluted with 29+ BVs of HNO3 processed at 25 C and at 1.4 BV/h. The two independent tracers allowed analysis of the on-column cesium interaction between the loading and elution solutions. The objective of these tests was to improve the correlation between the spent resin cesium content and cesium leached out of the resin in subsequent loading cycles (cesium leakage) to help establish acid strength and purity requirements.

Brown, Garrett N.; Russell, Renee L.; Peterson, Reid A.

2011-10-21T23:59:59.000Z

464

CHEMICAL EVOLUTION IN HIGH-MASS STAR-FORMING REGIONS: RESULTS FROM THE MALT90 SURVEY  

SciTech Connect (OSTI)

The chemical changes of high-mass star-forming regions provide a potential method for classifying their evolutionary stages and, ultimately, ages. In this study, we search for correlations between molecular abundances and the evolutionary stages of dense molecular clumps associated with high-mass star formation. We use the molecular line maps from Year 1 of the Millimetre Astronomy Legacy Team 90 GHz (MALT90) Survey. The survey mapped several hundred individual star-forming clumps chosen from the ATLASGAL survey to span the complete range of evolution, from prestellar to protostellar to H II regions. The evolutionary stage of each clump is classified using the Spitzer GLIMPSE/MIPSGAL mid-IR surveys. Where possible, we determine the dust temperatures and H{sub 2} column densities for each clump from Herschel/Hi-GAL continuum data. From MALT90 data, we measure the integrated intensities of the N{sub 2}H{sup +}, HCO{sup +}, HCN and HNC (1-0) lines, and derive the column densities and abundances of N{sub 2}H{sup +} and HCO{sup +}. The Herschel dust temperatures increase as a function of the IR-based Spitzer evolutionary classification scheme, with the youngest clumps being the coldest, which gives confidence that this classification method provides a reliable way to assign evolutionary stages to clumps. Both N{sub 2}H{sup +} and HCO{sup +} abundances increase as a function of evolutionary stage, whereas the N{sub 2}H{sup +} (1-0) to HCO{sup +} (1-0) integrated intensity ratios show no discernable trend. The HCN (1-0) to HNC(1-0) integrated intensity ratios show marginal evidence of an increase as the clumps evolve.

Hoq, Sadia; Jackson, James M.; Foster, Jonathan B.; Sanhueza, Patricio; Claysmith, Christopher [Institute for Astrophysical Research, Boston University, Boston, MA 02215 (United States); Guzmán, Andrés [Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 (United States); Whitaker, J. Scott [Physics Department, Boston University, Boston, MA 02215 (United States); Rathborne, Jill M. [Australia Telescope National Facility, CSIRO Astronomy and Space Science, Epping, NSW (Australia); Vasyunina, Tatiana; Vasyunin, Anton, E-mail: shoq@bu.edu, E-mail: jackson@bu.edu, E-mail: patricio@bu.edu, E-mail: claysmit@bu.edu, E-mail: jonathan.b.foster@yale.edu, E-mail: aguzmanf@cfa.harvard.edu, E-mail: scott@bu.edu, E-mail: rathborne@csiro.au, E-mail: tv3h@virginia.edu, E-mail: aiv3f@virginia.edu [Department of Chemistry, University of Virginia, Charlottesville, VA 22904 (United States)

2013-11-10T23:59:59.000Z

465

Finding of no significant impact. Consolidation and interim storage of special nuclear material at Rocky Flats Environmental Technology Site  

SciTech Connect (OSTI)

The Department of Energy (DOE) has prepared an environmental assessment (EA), DOE/EA -- 1060, for the consolidation, processing, and interim storage of Category I and II special nuclear material (SNM) in Building 371 at the Rocky Flats Environmental Technology Site (hereinafter referred to as Rocky Flats or Site), Golden, Colorado. The scope of the EA included alternatives for interim storage including the no action alternative, the construction of a new facility for interim storage at Rocky Flats, and shipment to other DOE facilities for interim storage.

NONE

1995-06-01T23:59:59.000Z

466

Nuclear and gravitational energies in stars  

E-Print Network [OSTI]

The force that governs the evolution of stars is gravity. Indeed this force drives star formation, imposes thermal and density gradients into stars at hydrostatic equilibrium and finally plays the key role in the last phases of their evolution. Nuclear power in stars governs their lifetimes and of course the stellar nucleosynthesis. The nuclear reactions are at the heart of the changes of composition of the baryonic matter in the Universe. This change of composition, in its turn, has profound consequences on the evolution of stars and galaxies. The energy extracted from the gravitational, respectively nuclear reservoirs during the lifetimes of stars of different masses are estimated. It is shown that low and intermediate mass stars (M 8 Msol), which explode in a supernova explosion, extract more than 5 times more energy from the gravitational reservoir than from the nuclear one. We conclude by discussing a few important nuclear reactions and their link to topical astrophysical questions.

Meynet, Georges; Ekström, Sylvia

2013-01-01T23:59:59.000Z

467

A SURVEY OF H{sub 2}O, CO{sub 2}, AND CO ICE FEATURES TOWARD BACKGROUND STARS AND LOW-MASS YOUNG STELLAR OBJECTS USING AKARI  

SciTech Connect (OSTI)

We present near-infrared spectroscopic observations of 19 molecular clouds made using the AKARI satellite, and the data reduction pipeline written to analyze those observations. The 2.5-5 ?m spectra of 30 objects—22 field stars behind quiescent molecular clouds and 8 low-mass young stellar objects in cores—were successfully extracted using the pipeline. Those spectra are further analyzed to calculate the column densities of key solid phase molecular species, including H{sub 2}O, CO{sub 2}, CO, and OCN{sup –}. The profile of the H{sub 2}O ice band is seen to vary across the objects observed and we suggest that the extended red wing may be an evolutionary indicator of both dust and ice mantle properties. The observation of 22 spectra with fluxes as low as < 5 mJy toward background stars, including 15 where the column densities of H{sub 2}O, CO, and CO{sub 2} were calculated, provides valuable data that could help to benchmark the initial conditions in star-forming regions prior to the onset of star formation.

Noble, J. A. [Aix-Marseille Université, PIIM UMR 7345, F-13397 Marseille (France); Fraser, H. J. [Department of Physical Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA (United Kingdom); Aikawa, Y. [Department of Earth and Planetary Sciences, Kobe University, Kobe 657-8501 (Japan); Pontoppidan, K. M. [Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States); Sakon, I., E-mail: helen.fraser@open.ac.uk [Department of Astronomy, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0003 (Japan)

2013-10-01T23:59:59.000Z

468

Detailed Geophysical Fault Characterization in Yucca Flat, Nevada Test Site, Nevada  

SciTech Connect (OSTI)

Yucca Flat is a topographic and structural basin in the northeastern part of the Nevada Test Site (NTS) in Nye County, Nevada. Between the years 1951 and 1992, 659 underground nuclear tests took place in Yucca Flat; most were conducted in large, vertical excavations that penetrated alluvium and the underlying Cenozoic volcanic rocks. Radioactive and other potential chemical contaminants at the NTS are the subject of a long-term program of investigation and remediation by the U.S. Department of Energy (DOE), National Nuclear Security Administration, Nevada Site Office, under its Environmental Restoration Program. As part of the program, the DOE seeks to assess the extent of contamination and to evaluate the potential risks to humans and the environment from byproducts of weapons testing. To accomplish this objective, the DOE Environmental Restoration Program is constructing and calibrating a ground-water flow model to predict hydrologic flow in Yucca Flat as part of an effort to quantify the subsurface hydrology of the Nevada Test Site. A necessary part of calibrating and evaluating a model of the flow system is an understanding of the location and characteristics of faults that may influence ground-water flow. In addition, knowledge of fault-zone architecture and physical properties is a fundamental component of the containment of the contamination from underground nuclear tests, should such testing ever resume at the Nevada Test Site. The goal of the present investigation is to develop a detailed understanding of the geometry and physical properties of fault zones in Yucca Flat. This study was designed to investigate faults in greater detail and to characterize fault geometry, the presence of fault splays, and the fault-zone width. Integrated geological and geophysical studies have been designed and implemented to work toward this goal. This report describes the geophysical surveys conducted near two drill holes in Yucca Flat, the data analyses performed, and the integrated interpretations developed from the suite of geophysical methodologies utilized in this investigation. Data collection for this activity started in the spring of 2005 and continued into 2006. A suite of electrical geophysical surveys were run in combination with ground magnetic surveys; these surveys resulted in high-resolution subsurface data that portray subsurface fault geometry at the two sites and have identified structures not readily apparent from surface geologic mapping, potential field geophysical data, or surface effects fracture maps.

Theodore H. Asch; Donald Sweetkind; Bethany L. Burton; Erin L. Wallin

2009-02-10T23:59:59.000Z

469

A quasi-3D analysis of the thermal performance of a flat heat pipe G. Carbajal a,*, C.B. Sobhan b  

E-Print Network [OSTI]

A quasi-3D analysis of the thermal performance of a flat heat pipe G. Carbajal a,*, C.B. Sobhan b form 29 January 2007 Available online 8 May 2007 Abstract The thermal performance of a flat heat pipe. The transient temperature distribution on a solid aluminum plate was compared with the flat heat pipe results

Wadley, Haydn

470

On tidal capture of primordial black holes by neutron stars  

E-Print Network [OSTI]

The fraction of primordial black holes (PBHs) of masses $10^{17} - 10^{26}$ g in the total amount of dark matter may be constrained by considering their capture by neutron stars (NSs), which leads to the rapid destruction of the latter. The constraints depend crucially on the capture rate which, in turn, is determined by the energy loss by a PBH passing through a NS. Two alternative approaches to estimate the energy loss have been used in the literature: the one based on the dynamical friction mechanism, and another on tidal deformations of the NS by the PBH. The second mechanism was claimed to be more efficient by several orders of magnitude due to the excitation of particular oscillation modes reminiscent of the surface waves. We address this disagreement by considering a simple analytically solvable model that consists of a flat incompressible fluid in an external gravitational field. In this model, we calculate the energy loss by a PBH traversing the fluid surface. We find that the excitation of modes with the propagation velocity smaller than that of PBH is suppressed, which implies that in a realistic situation of a supersonic PBH the large contributions from the surface waves are absent and the above two approaches lead to consistent expressions for the energy loss.

Guillaume Defillon; Etienne Granet; Petr Tinyakov; Michel H. G. Tytgat

2014-09-01T23:59:59.000Z

471

External Peer Review Team Report Underground Testing Area Subproject for Frenchman Flat, Revision 1  

SciTech Connect (OSTI)

An external peer review was conducted to review the groundwater models used in the corrective action investigation stage of the Underground Test Area (UGTA) subproject to forecast zones of potential contamination in 1,000 years for the Frenchman Flat area. The goal of the external peer review was to provide technical evaluation of the studies and to assist in assessing the readiness of the UGTA subproject to progress to monitoring activities for further model evaluation. The external peer review team consisted of six independent technical experts with expertise in geology, hydrogeology,'''groundwater modeling, and radiochemistry. The peer review team was tasked with addressing the following questions: 1. Are the modeling approaches, assumptions, and model results for Frenchman Flat consistent with the use of modeling studies as a decision tool for resolution of environmental and regulatory requirements? 2. Do the modeling results adequately account for uncertainty in models of flow and transport in the Frenchman Flat hydrological setting? a. Are the models of sufficient scale/resolution to adequately predict contaminant transport in the Frenchman Flat setting? b. Have all key processes been included in the model? c. Are the methods used to forecast contaminant boundaries from the transport modeling studies reasonable and appropriate? d. Are the assessments of uncertainty technically sound and consistent with state-of-the-art approaches currently used in the hydrological sciences? 3. Are the datasets and modeling results adequate for a transition to Corrective Action Unit monitoring studies—the next stage in the UGTA strategy for Frenchman Flat? The peer review team is of the opinion that, with some limitations, the modeling approaches, assumptions, and model results are consistent with the use of modeling studies for resolution of environmental and regulatory requirements. The peer review team further finds that the modeling studies have accounted for uncertainty in models of flow and transport in the Frenchman Flat except for a few deficiencies described in the report. Finally, the peer review team concludes that the UGTA subproject has explored a wide range of variations in assumptions, methods, and data, and should proceed to the next stage with an emphasis on monitoring studies. The corrective action strategy, as described in the Federal Facility Agreement and Consent Order, states that the groundwater flow and transport models for each corrective action unit will consider, at a minimum, the following: • Alternative hydrostratigraphic framework models of the modeling domain. • Uncertainty in the radiological and hydrological source terms. • Alternative models of recharge. • Alternative boundary conditions and groundwater flows. • Multiple permissive sets of calibrated flow models. • Probabilistic simulations of transport using plausible sets of alternative framework and recharge models, and boundary and groundwater flows from calibrated flow models. • Ensembles of forecasts of contaminant boundaries. • Sensitivity and uncertainty analyses of model outputs. The peer review team finds that these minimum requirements have been met. While the groundwater modeling and uncertainty analyses have been quite detailed, the peer review team has identified several modeling-related issues that should be addressed in the next phase of the corrective action activities: • Evaluating and using water-level gradients from the pilot wells at the Area 5 Radioactive Waste Management Site in model calibration. • Re-evaluating the use of geochemical age-dating data to constrain model calibrations. • Developing water budgets for the alluvial and upper volcanic aquifer systems in Frenchman Flat. • Considering modeling approaches in which calculated groundwater flow directions near the water table are not predetermined by model boundary conditions and areas of recharge, all of which are very uncertain. • Evaluating local-scale variations in hydraulic conductivity on the calculated contaminant boundaries. • Evaluat

Sam Marutzky

2010-09-01T23:59:59.000Z

472

Massive Stars and their Supernovae  

E-Print Network [OSTI]

Massive stars and their supernovae are prominent sources of radioactive isotopes, the observations of which thus can help to improve our astrophysical models of those. Our understanding of stellar evolution and the final explosive endpoints such as supernovae or hypernovae or gamma-ray bursts relies on the combination of magneto-hydrodynamics, energy generation due to nuclear reactions accompanying composition changes, radiation transport, and thermodynamic properties (such as the equation of state of stellar matter). Nuclear energy production includes all nuclear reactions triggered during stellar evolution and explosive end stages, also among unstable isotopes produced on the way. Radiation transport covers atomic physics (e.g. opacities) for photon transport, but also nuclear physics and neutrino nucleon/nucleus interactions in late phases and core collapse. Here we want to focus on the astrophysical aspects, i.e. a description of the evolution of massive stars and their endpoints, with a special emphasis ...

Thielemann, Friedrich-Karl; Liebendörfer, Matthias; Diehl, Roland; 10.1007/978-3-642-12698-7_4

2010-01-01T23:59:59.000Z

473

Roche tomography of cataclysmic variables -- II. Images of the secondary stars in AM Her, QQ Vul, IP Peg and HU Aqr  

E-Print Network [OSTI]

We present a set of Roche tomography reconstructions of the secondary stars in the cataclysmic variables AM Her, QQ Vul, IP Peg and HU Aqr. The image reconstructions show distinct asymmetries in the irradiation pattern for all four systems which can be attributed to shielding of the secondary star by the accretion stream/column in AM Her, QQ Vul and HU Aqr, and increased irradiation by the bright spot in IP Peg. We use the entropy landscape technique to derive accurate system parameters (M1, M2, i and gamma) for the four binaries. In principle, this technique should provide the most reliable mass determinations available, since the intensity distribution across the secondary star is known. We also find that the intensity distribution can systematically affect the value of gamma derived from circular orbit fits to radial velocity variations.

C. A. Watson; V. S. Dhillon; R. G. M. Rutten; A. D. Schwope

2003-02-06T23:59:59.000Z

474

BLAST Autonomous Daytime Star Cameras  

E-Print Network [OSTI]

We have developed two redundant daytime star cameras to provide the fine pointing solution for the balloon-borne submillimeter telescope, BLAST. The cameras are capable of providing a reconstructed pointing solution with an absolute accuracy autonomous. An internal computer controls the temperature, adjusts the focus, and determines a real-time pointing solution at 1 Hz. The mechanical details and flight performance of these instruments are presented.

Marie Rex; Edward Chapin; Mark J. Devlin; Joshua Gundersen; Jeff Klein; Enzo Pascale; Donald Wiebe

2006-05-01T23:59:59.000Z

475

ENERGY STAR | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Office of InspectorConcentrating Solar Power Basics (The followingDirectLow Carbon TransitionENERGY STAR Jump to:

476

Numerical Study of Convective Heat Transfer in Flat Tube Heat Exchangers Operating in Self-Sustained Oscillatory Flow Regimes  

E-Print Network [OSTI]

Laminar, two-dimensional, constant-property numerical simulations of flat tube heat exchanger devices operating in flow regimes in which self-sustained oscillations occur were performed. The unsteady flow regimes were transition flow regimes...

Fullerton, Tracy

2012-02-14T23:59:59.000Z

477

A comparison of workstation dimensions and body postures between 17" CRT, 21" CRT, and 19" flat panel monitors  

E-Print Network [OSTI]

Use of visual display terminals has been implicated as a risk factor in visual discomfort. With the progression of new technology, larger CRT monitors and alternate display technologies, such as flat panels, are entering the office environment. Few...

Walline, Erin Kurusz

2012-06-07T23:59:59.000Z

478

A Flat Histogram Method for Computing the Density of States of Combinatorial Stefano Ermon, Carla Gomes, Bart Selman  

E-Print Network [OSTI]

A Flat Histogram Method for Computing the Density of States of Combinatorial Problems Stefano Ermon of both SAT, MAX- SAT and model counting. We propose a novel Markov Chain Monte Carlo al- gorithm

Keinan, Alon

479

EIS-0277: Management of Certain Plutonium Residues and Scrub Alloy Stored at the Rocky Flats Environmental Technology Site  

Broader source: Energy.gov [DOE]

This EIS evaluates the potential alternatives and impacts associated with a proposal to process certain plutonium residues and all of the scrub alloy currently stored at Rocky Flats. While ongoing...

480

Review of solar thermoelectric energy conversion and analysis of a two cover flat-plate solar collector  

E-Print Network [OSTI]

The process of solar thermoelectric energy conversion was explored through a review of thermoelectric energy generation and solar collectors. Existing forms of flat plate collectors and solar concentrators were surveyed. ...

Hasan, Atiya

2007-01-01T23:59:59.000Z

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481

Neutron stars and strange stars in the chiral SU(3) quark mean field model  

E-Print Network [OSTI]

We investigate the equations of state for pure neutron matter and strange hadronic matter in $\\beta$-equilibrium, including $\\Lambda$, $\\Sigma$ and $\\Xi$ hyperons. The masses and radii of pure neutron stars and strange hadronic stars are obtained. For a pure neutron star, the maximum mass is about $1.8 M_{\\mathrm{sun}}$, while for a strange hadronic star, the maximum mass is around $1.45 M_{\\mathrm{sun}}$. The typical radii of pure neutron stars and strange hadronic stars are about 11.0-12.3 km and 10.7-11.7 km, respectively.

P. Wang; S. Lawley; D. B. Leinweber; A. W. Thomas; A. G. Williams

2005-06-06T23:59:59.000Z

482

Winds of Planet Hosting Stars  

E-Print Network [OSTI]

The field of exoplanetary science is one of the most rapidly growing areas of astrophysical research. As more planets are discovered around other stars, new techniques have been developed that have allowed astronomers to begin to characterise them. Two of the most important factors in understanding the evolution of these planets, and potentially determining whether they are habitable, are the behaviour of the winds of the host star and the way in which they interact with the planet. The purpose of this project is to reconstruct the magnetic fields of planet hosting stars from spectropolarimetric observations, and to use these magnetic field maps to inform simulations of the stellar winds in those systems using the Block Adaptive Tree Solar-wind Roe Upwind Scheme (BATS-R-US) code. The BATS-R-US code was originally written to investigate the behaviour of the Solar wind, and so has been altered to be used in the context of other stellar systems. These simulations will give information about the velocity, pressur...

Nicholson, B A; Brookshaw, L; Vidotto, A A; Carter, B D; Marsden, S C; Soutter, J; Waite, I A; Horner, J

2015-01-01T23:59:59.000Z

483

Magnetic fields in Neutron Stars  

E-Print Network [OSTI]

Isolated neutron stars show a diversity in timing and spectral properties, which has historically led to a classification in different sub-classes. The magnetic field plays a key role in many aspects of the neutron star phenomenology: it regulates the braking torque responsible for their timing properties and, for magnetars, it provides the energy budget for the outburst activity and high quiescent luminosities (usually well above the rotational energy budget). We aim at unifying this observational variety by linking the results of the state-of-the-art 2D magneto-thermal simulations with observational data. The comparison between theory and observations allows to place two strong constraints on the physical properties of the inner crust. First, strong electrical currents must circulate in the crust, rather than in the star core. Second, the innermost part of the crust must be highly resistive, which is in principle in agreement with the presence of a novel phase of matter so-called nuclear pasta phase.

Viganň, Daniele; Miralles, Juan A; Rea, Nanda

2015-01-01T23:59:59.000Z

484

Search for bright stars with infrared excess  

SciTech Connect (OSTI)

Bright stars, stars with visual magnitude smaller than 6.5, can be studied using small telescope. In general, if stars are assumed as black body radiator, then the color in infrared (IR) region is usually equal to zero. Infrared data from IRAS observations at 12 and 25?m (micron) with good flux quality are used to search for bright stars (from Bright Stars Catalogues) with infrared excess. In magnitude scale, stars with IR excess is defined as stars with IR color m{sub 12}?m{sub 25}>0; where m{sub 12}?m{sub 25}?=??2.5log(F{sub 12}/F{sub 25})+1.56, where F{sub 12} and F{sub 25} are flux density in Jansky at 12 and 25?m, respectively. Stars with similar spectral type are expected to have similar color. The existence of infrared excess in the same spectral type indicates the existence of circum-stellar dust, the origin of which is probably due to the remnant of pre main-sequence evolution during star formation or post AGB evolution or due to physical process such as the rotation of those stars.

Raharto, Moedji, E-mail: moedji@as.itb.ac.id [Astronomy Research Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung 40132 (Indonesia)

2014-03-24T23:59:59.000Z

485

The role of low-mass star clusters in massive star formation in Orion  

E-Print Network [OSTI]

To distinguish between the different theories proposed to explain massive star formation, it is crucial to establish the distribution, the extinction, and the density of low-mass stars in massive star-forming regions. We analyzed deep X-ray observations of the Orion massive star-forming region using the Chandra Orion Ultradeep Project (COUP) catalog. We found that pre-main sequence (PMS) low-mass stars cluster toward the three massive star-forming regions: the Trapezium Cluster (TC), the Orion Hot Core (OHC), and OMC1-S. We derived low-mass stellar densities of 10^{5} stars pc^{-3} in the TC and OMC1-S, and of 10^{6} stars pc^{-3} in the OHC. The close association between the low-mass star clusters with massive star cradles supports the role of these clusters in the formation of massive stars. The X-ray observations show for the first time in the TC that low-mass stars with intermediate extinction are clustered toward the position of the most massive star, which is surrounded by a ring of non-extincted low-ma...

Rivilla, V M; Jimenez-Serra, I; Rodriguez-Franco, A

2013-01-01T23:59:59.000Z

486

Design criteria for multi-layered scintillating fibre arrays with inclined columns  

E-Print Network [OSTI]

Multi-layered scintillating fibre arrays read-out are commonly used as high resolution charged particle hodoscopes. Fibres of a column along the geometrical trajectory of incident particles are typically grouped to one pixel of a multi-channel read-out device. In some applications the incident particles will cross the detection plane with large angles w.r.t. the normal to the layers. Then, the packing of the fibres needs to be adapted to the incident particles and the columns need to be inclined. In this paper possible fibre array geometries are shown, relevant design criteria for detectors are discussed, and the effect of diverging particles incident on fibre arrays was studied using a Monte Carlo simulation.

P. Achenbach; L. Nungesser; J. Pochodzalla

2008-02-29T23:59:59.000Z

487

Optics elements for modeling electrostatic lenses and accelerator components II. Acceleration columns  

SciTech Connect (OSTI)

A set of optical models for a variety of electrostatic lenses and accelerator columns has been developed for the computer code TRACE 3-D. TRACE 3-D is an envelope (matrix) code including space charge that is often used to model bunched beams in magnetic transport systems and radiofrequency (RF) accelerators when the effects of beam current may be important. Several new matrix models have been developed that allow the code to be used for modeling beam lines and accelerators with electrostatic components. The new models include a number of options for: (1) einzel lenses, (2) accelerator columns, (3) electrostatic deflectors (prisms), and (4) an electrostatic quadrupole. A prescription for setting up the initial beam appropriate to modeling 2-D (continuous) beams has also been developed. The new models for (2) are described in this paper, selected comparisons with other calculations are presented, and a beamline application is summarized.

Gillespie, G.H., Brown, T.A.

1998-05-01T23:59:59.000Z

488

Trapping of electrons in troughs of self generated electromagnetic standing waves in a bounded plasma column  

SciTech Connect (OSTI)

Observations and measurements are reported on electron trapping in troughs of self-generated electromagnetic standing waves in a bounded plasma column confined in a minimum-B field. The boundaries are smaller than the free space wavelength of the waves. Earlier work of researchers primarily focused upon electron localization effects induced by purely electrostatic perturbation. We demonstrate the possibility in the presence of electromagnetic standing waves generated in the bounded plasma column. The electron trapping is verified with electrostatic measurements of the plasma floating potential, electromagnetic measurements of the wave field profile, and optical intensity measurements of Argon ionic line at 488?nm. The experimental results show a reasonably good agreement with predictions of a Monte Carlo simulation code that takes into account all kinematical and dynamical effects in the plasma in the presence of bounded waves and external fields.

Bhattacharjee, Sudeep; Sahu, Debaprasad; Pandey, Shail; Chatterjee, Sanghomitro [Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208016 (India)] [Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208016 (India); Dey, Indranuj [Department of Advanced Energy Engineering Science, Kyushu University, Kasuga Kouen 6-1, Kasuga City 816-8580 (Japan)] [Department of Advanced Energy Engineering Science, Kyushu University, Kasuga Kouen 6-1, Kasuga City 816-8580 (Japan); Roy Chowdhury, Krishanu [Max Planck Institute for the Physics of Complex System, Dresden 01187 (Germany)] [Max Planck Institute for the Physics of Complex System, Dresden 01187 (Germany)

2014-01-15T23:59:59.000Z

489

Heat transfer in the plate heat exchanger of an ammonia-synthesis column  

SciTech Connect (OSTI)

The planning and construction of high-capacity synthetic ammonia plants requires the development and fabrication of unique, high unit-power equipment with high technical and economic characteristics. In foreign and domestic practice, tubular heat exchangers with relatively low heat-transfer coefficients are used. Plate heat exchangers are a promising alternative. They are compact and have a high heat energy efficiency and a relatively small metal content. To make an experimental check of the operating capability of a plate heat exchanger under ammonia production conditions, a welded plate heat exchanger was designed for an ammonia synthesis column 800mm in diameter. On prolonged testing (four years), the device provided an autothermal operating mode in the column and the heat transfer coefficient was practically constant for fixed space velocities. Consequently, the heat exchange surface was not contaminated significantly with catalyst dust, confirmed by visual observation of the heat exchanger after disassembly.

Obolentsev, Y.G.; Chus', M.S.; Norobchanskii, O.A.; Teplitshi, Y.S.; Tovazhnyanskii, L.L.

1983-01-01T23:59:59.000Z

490

Improving the Performance of a Two-Shell Column with Advanced Control  

E-Print Network [OSTI]

acetylene content as well as total C]'s. A deadtime compensated PID algorithm sets the target for the reboiler steam flow controller to maintain the target concentration. The steam flow is also adjusted by moves from a feedforward controller... content increased. This also allows the rectifier to run cooler. RESULTS The advanced computer control strategies have improved product quality, increased column capacity and improved energy efficiency. The composition controls maintain operations...

Morrison, T. A.; Laflamme, D.

491

Experimental Ion Exchange Column With SuperLig 639 And Simulant Formulation  

SciTech Connect (OSTI)

SuperLig®639 ion exchange resin was tested as a retrieval mechanism for pertechnetate, through decontamination of a perrhenate spiked 5M Simple Average Na{sup +} Mass Based Simulant. Testing included batch contacts and a three-column ion exchange campaign. A decontamination of perrhenate exceeding 99% from the liquid feed was demonstrated. Analysis of the first formulation of a SBS/WESP simulant found unexpectedly low concentrations of soluble aluminum. Follow-on work will complete the formulation.

Morse, Megan; Nash, C.

2013-08-26T23:59:59.000Z

492

Design and validation of a settling column for particle transport studies  

E-Print Network [OSTI]

the column and the advective- dispersive model. Average settling velocities predicted for the sewage sludge were estimated to be 2x10-s cm/sec in freshwater and 7x10-s cm/sec in saltwater. The sediments settled at 1x10-z cm/sec in freshwater and 3x10-z cm.... Objectives. I V V V I V I I I I X 1 2 LITERATURE REVIEW Particle Transport. Particle Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Measurement of Transport Characteristics. . . . . Sample Background...

Ducharme, Sharon Lynn

2012-06-07T23:59:59.000Z

493

Effects from Alkali-Silica Reacton and Delayed Ettringite Formation on Reinforced Concrete Column Lap Splices  

E-Print Network [OSTI]

EFFECTS FROM ALKALI-SILICA REACTION AND DELAYED ETTRINGITE FORMATION ON REINFORCED CONCRETE COLUMN LAP SPLICES A Thesis by MARY KATHLEEN ECK Submitted to the Office of Graduate Studies of Texas A&M University in partial... by MARY KATHLEEN ECK Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE Approved by: Chair of Committee, Joseph M. Bracci Committee Members...

Eck, Mary

2012-07-16T23:59:59.000Z

494

Processes and catalysts for conducting fischer-tropsch synthesis in a slurry bubble column reactor  

DOE Patents [OSTI]

Processes and catalysts for conducting Fischer-Tropsch synthesis in a slurry bubble column reactor (SBCR). One aspect of the invention involves the use of cobalt catalysts without noble metal promotion in an SBCR. Another aspect involves using palladium promoted cobalt catalysts in an SBCR. Methods for preparing noble metal promoted catalysts via totally aqueous impregnation and procedures for producing attrition resistant catalysts are also provided.

Singleton, Alan H. (Marshall Township, Allegheny County, PA); Oukaci, Rachid (Allison Park, PA); Goodwin, James G. (Cranberry Township, PA)

1999-01-01T23:59:59.000Z

495

Application of the theta method to distillation columns where one or more reactions occur per stage  

E-Print Network [OSTI]

per Stage Theta Method of Convergence K Method Calculation of Enthalpies of Mixtures Enthalpy Balances. Calculational Procedure 14 16 I7 20 25 28 38 44 Numerical Examples Example 1 Example 2 COLUMNS AT TOTAL REFLUX 44 45 51 64... OF TABLES TABLE Page Expressions for the Reaction Function R for Various Types of Reactions 29 Calculation of the Partial Derivatives 32 Statement of Example l. Solution of Example 1 Statement of Example 2. Solution of Example 2 46 53 59...

Izarraraz, Alicia

2012-06-07T23:59:59.000Z

496

Processes and catalysts for conducting Fischer-Tropsch synthesis in a slurry bubble column reactor  

DOE Patents [OSTI]

Processes and catalysts are disclosed for conducting Fischer-Tropsch synthesis in a slurry bubble column reactor (SBCR). One aspect of the invention involves the use of cobalt catalysts without noble metal promotion in an SBCR. Another aspect involves using palladium promoted cobalt catalysts in an SBCR. Methods for preparing noble metal promoted catalysts via totally aqueous impregnation and procedures for producing attrition resistant catalysts are also provided. 1 fig.

Singleton, A.H.; Oukaci, R.; Goodwin, J.G.

1999-08-17T23:59:59.000Z

497

THE COLUMN DENSITY DISTRIBUTION AND CONTINUUM OPACITY OF THE INTERGALACTIC AND CIRCUMGALACTIC MEDIUM AT REDSHIFT (z) = 2.4  

SciTech Connect (OSTI)

We present new high-precision measurements of the opacity of the intergalactic and circumgalactic medium (IGM; CGM) at (z) = 2.4. Using Voigt profile fits to the full Ly{alpha} and Ly{beta} forests in 15 high-resolution high-S/N spectra of hyperluminous QSOs, we make the first statistically robust measurement of the frequency of absorbers with H I column densities 14{approx}< log (N{sub H{sub I}}/cm{sup -2}){approx}<17.2. We also present the first measurements of the frequency distribution of H I absorbers in the volume surrounding high-z galaxies (the CGM, 300 pkpc), finding that the incidence of absorbers in the CGM is much higher than in the IGM. In agreement with Rudie et al., we find that there are fractionally more high-N{sub H{sub I}} absorbers than low-N{sub H{sub I}} absorbers in the CGM compared to the IGM, leading to a shallower power law fit to the CGM frequency distribution. We use these new measurements to calculate the total opacity of the IGM and CGM to hydrogen-ionizing photons, finding significantly higher opacity than most previous studies, especially from absorbers with log (N{sub H{sub I}}/cm{sup -2}) < 17.2. Reproducing the opacity measured in our data as well as the incidence of absorbers with log (N{sub H{sub I}}/cm{sup -2})>17.2 requires a broken power law parameterization of the frequency distribution with a break near N{sub H{sub I}} Almost-Equal-To 10{sup 15} cm{sup -2}. We compute new estimates of the mean free path ({lambda}{sub mfp}) to hydrogen-ionizing photons at z{sub em} = 2.4, finding {lambda}{sub mfp} = 147 {+-} 15 Mpc when considering only IGM opacity. If instead, we consider photons emanating from a high-z star-forming galaxy and account for the local excess opacity due to the surrounding CGM of the galaxy itself, the mean free path is reduced to {lambda}{sub mfp} = 121 {+-} 15 Mpc. These {lambda}{sub mfp} measurements are smaller than recent estimates and should inform future studies of the metagalactic UV background and of ionizing sources at z Almost-Equal-To 2-3.

Rudie, Gwen C.; Steidel, Charles C. [Cahill Center for Astronomy and Astrophysics, California Institute of Technology, MS 249-17, Pasadena, CA 91125 (United States); Shapley, Alice E. [Department of Astronomy, University of California, Los Angeles, 430 Portola Plaza, Los Angeles, CA 90024 (United States); Pettini, Max, E-mail: gwen@astro.caltech.edu [Institute of Astronomy, Madingley Road, Cambridge CB3 0HA (United Kingdom)

2013-06-01T23:59:59.000Z

498

Radio Triggered Star Formation in Cooling Flows  

E-Print Network [OSTI]

The giant galaxies located at the centers of cluster cooling flows are frequently sites of vigorous star formation. In some instances, star formation appears to have been triggered by the galaxy's radio source. The colors and spectral indices of the young populations are generally consistent with short duration bursts or continuous star formation for durations much less than 1 Gyr, which is less than the presumed ages of cooling flows. The star formation properties are inconsistent with fueling by a continuously accreting cooling flow, although the prevalence of star formation is consistent with repeated bursts and periodic refueling. Star formation may be fueled, in some cases, by cold material stripped from neighboring cluster galaxies.

B. R. McNamara

1999-11-08T23:59:59.000Z

499

Sequentially Triggered Star Formation in OB Associations  

E-Print Network [OSTI]

We discuss observational evidence for sequential and triggered star formation in OB associations. We first review the star formation process in the Scorpius-Centaurus OB association, the nearest OB association to the Sun, where several recent extensive studies have allowed us to reconstruct the star formation history in a rather detailed way. We then compare the observational results with those obtained for other OB associations and with recent models of rapid cloud and star formation in the turbulent interstellar medium. We conclude that the formation of whole OB subgroups (each consisting of several thousand stars) requires large-scale triggering mechanisms such as shocks from expanding wind and supernova driven superbubbles surrounding older subgroups. Other triggering mechanisms, like radiatively driven implosion of globules, also operate, but seem to be secondary processes, forming only small stellar groups rather than whole OB subgroups with thousands of stars.

Thomas Preibisch; Hans Zinnecker

2006-10-27T23:59:59.000Z

500

Boson stars: Chemical potential and quark condensates  

E-Print Network [OSTI]

We study the properties of a star made of self-gravitating bosons gas in a mean-field approximation. A generalized set of Tolman-Oppenheimer-Volkov(TOV) equations is derived to incorporate the effect of chemical-potential in the general relativistic frame work. The metric-dependence of the chemical-potential gives a new class of solutions for the boson stars. It is demonstrated that the maximum mass and radius of the star change in a significant way when the effect of finite chemical-potential is considered. We also discuss the case of a boson star made of quark-condensates. It is found that when the self-interaction between the condensates is small as compared to their mass, the typical density is too high to form a diquark-boson star. Our results indicate that the star of quark-condensate may be formed in a low-density and high-pressure regime.

Jitesh R. Bhatt; V. Sreekanth

2010-05-06T23:59:59.000Z