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Note: This page contains sample records for the topic "fugitive dust emissions" from the National Library of EnergyBeta (NLEBeta).
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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

Engineering analysis of fugitive particulate matter emissions from cattle feedyards  

E-Print Network [OSTI]

An engineering analysis of the fugitive particulate matter emissions from a feedyard is not simple. The presence of an evening dust peak in concentration measurements downwind of a feedyard complicates the calculation of an average 24-h emission...

Hamm, Lee Bradford

2006-04-12T23:59:59.000Z

2

NETL: Fugitive Gas Emissions Detection Facilities  

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

Fugitive Gas Emissions Detection Facilities Fugitive Gas Emissions Detection Facilities NETL uses an array of innovative laboratory techniques and field methods to detect and monitor fugitive emissions of CO2 stored in geologic formations. By providing an accurate accounting of stored CO2 and a high level of confidence that the CO2 will permanently remain in storage, these efforts can help ensure the technical soundness and economic viability of carbon sequestration, a technology that is critical to meeting the national goal of reduced greenhouse gas emissions. Successful research to establish the stability and integrity of host formations will help developers of sequestration projects secure permits and emissions reduction credits, while preventing damage to ecosystems and ensuring public health and safety.

3

Air Pollution Control Regulations: No. 5 - Fugitive Dust (Rhode Island) |  

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

5 - Fugitive Dust (Rhode 5 - Fugitive Dust (Rhode Island) Air Pollution Control Regulations: No. 5 - Fugitive Dust (Rhode Island) < Back Eligibility Agricultural Commercial Construction Fed. Government Fuel Distributor General Public/Consumer Industrial Installer/Contractor Institutional Investor-Owned Utility Local Government Low-Income Residential Multi-Family Residential Municipal/Public Utility Nonprofit Residential Retail Supplier Rural Electric Cooperative Schools State/Provincial Govt Systems Integrator Transportation Tribal Government Utility Savings Category Alternative Fuel Vehicles Hydrogen & Fuel Cells Buying & Making Electricity Water Home Weatherization Wind Program Info State Rhode Island Program Type Environmental Regulations Provider Department of Environmental Management These regulations aim to prevent the release of fugitive dust by forbidding

4

Estimation and Reduction Methodologies for Fugitive Emissions from Equipment  

E-Print Network [OSTI]

, as well as strategies to reduce fugitive emissions through leak detection and repair (LDAR) programs. Case studies are presented to illustrate the difference in computed emissions resulting from the different emission estimation methods..., and to illustrate the effects of a LDAR program implemented to reduce emissions from equipment leaks. The fugitive emissions reduction benefits of implementing an ongoing LDAR program, and the expected reductions from using more rigorous field testing...

Scataglia, A.

5

Capturing Fugitives to Reduce DOE's GHG Emissions | Department of Energy  

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

Capturing Fugitives to Reduce DOE's GHG Emissions Capturing Fugitives to Reduce DOE's GHG Emissions Capturing Fugitives to Reduce DOE's GHG Emissions November 15, 2011 - 2:04pm Addthis An electrician foreman for the Western Area Power Administration checks a circuit breaker at the Ault Substation in eastern Colorado. The circuit breaker, containing 85 lbs of SF6, protects equipment in the substation against damage from excessive electrical currents | Courtesy of Western Area Power Administration. An electrician foreman for the Western Area Power Administration checks a circuit breaker at the Ault Substation in eastern Colorado. The circuit breaker, containing 85 lbs of SF6, protects equipment in the substation against damage from excessive electrical currents | Courtesy of Western Area Power Administration.

6

The selection and maintenance of valves for the control of fugitive emissions  

SciTech Connect (OSTI)

The pulp and paper industry has long needed valves that (a) have extremely low stem leakage when they are new and (b) need little or no maintenance to retain that low leakage over their service life. The EPA fugitive emission regulations provide additional impetus for the pulp and paper industry to buy such valves and for the valve and packing industry to produce such valves. Even if particular operations are not covered by the fugitive emissions regulations, it is--and always has been--in a mill's best interest to have valves whose stems don't leak and need little or no maintenance to prevent that leakage. The paper gives some recommendations on how to meet that objective: selection the right packing materials; apply the right amount of stress to the packing; install the packing correctly; and use rotary valves where practical.

Dresch, C. (NIBCO Inc., Elkhart, IN (United States))

1994-08-01T23:59:59.000Z

7

Variability of Natural Dust Erosion from a Coal Pile  

Science Journals Connector (OSTI)

A study of fugitive dust emissions from a pile of crushed coal revealed that, in addition to emitting dust to the atmosphere during periods of pile management (human) activity, dust is also emitted during periods without human activity. This “...

Stephen F. Mueller; Jonathan W. Mallard; Qi Mao; Stephanie L. Shaw

8

Department of Earth Sciences www.rhul.ac.uk/earthsciences Page 1 of 2 Fugitive Methane Emissions in the UK and their Impacts on the Urban  

E-Print Network [OSTI]

Department of Earth Sciences www.rhul.ac.uk/earthsciences Page 1 of 2 Fugitive Methane Emissions James France, Prof Euan Nisbet Project Description: Methane is the second most important greenhouse gas amounts from vehicles, with emissions from landfills, ruminants and in some areas, coal mines

Sheldon, Nathan D.

9

Dust Emission from the Perseus Molecular Cloud  

E-Print Network [OSTI]

Using far-infrared emission maps taken by IRAS and Spitzer and a near-infrared extinction map derived from 2MASS data, we have made dust temperature and column density maps of the Perseus molecular cloud. We show that the emission from transiently heated very small grains and the big grain dust emissivity vary as a function of extinction and dust temperature, with higher dust emissivities for colder grains. This variable emissivity can not be explained by temperature gradients along the line of sight or by noise in the emission maps, but is consistent with grain growth in the higher density and lower temperature regions. By accounting for the variations in the dust emissivity and VSG emission, we are able to map the temperature and column density of a nearby molecular cloud with better accuracy than has previously been possible.

S. Schnee; J. Li; A. A. Goodman; A. I. Sargent

2008-05-27T23:59:59.000Z

10

Natural Gas Fugitive Emissions Rates Constrained by Global Atmospheric Methane and Ethane  

Science Journals Connector (OSTI)

Literature review of simulated non-FF emissions, observational data description, additional box-model and 3D-model results, and comparison of GHG emissions impacts from NG and coal power generation using global warming potentials. ... matter and coals is not yet clear from public data. ...

Stefan Schwietzke; W. Michael Griffin; H. Scott Matthews; Lori M. P. Bruhwiler

2014-06-19T23:59:59.000Z

11

Earth'sFuture Remote sensing of fugitive methane emissions from oil and  

E-Print Network [OSTI]

and tight oil reservoirs to exploit formerly inaccessible or unprofitable energy resources in rock are drilled out. In the production process of tight oil, co-occurring natural gas is typically used to drive. Therefore, methane emissions from field production of oil and gas from tight reservoirs have the potential

Dickerson, Russell R.

12

Evaluating point and process fugitive emission sources of particulate matter from feed mills associated with cattle feed yards  

E-Print Network [OSTI]

.e. by emitting more than 90.7 tonnes (100 tons) of a regulated pollutant annually) to obtain from its state air pollution regulatory agency (SAPRA) a federal operating permit (FOP). The results from this study will be used to develop scientifically based emission...

Demny, Michael Alan

2012-06-07T23:59:59.000Z

13

1995 Study and evaluation of fugitive and diffuse emissions from the 200 East Area at the Hanford Site  

SciTech Connect (OSTI)

The objective of this study is to evaluate Hanford`s major diffuse emission sources in the 200 East Area and evaluate the effectiveness of monitoring these sources collectively. The results from this evaluation may also be utilized to demonstrate Westinghouse`s compliance status with the applicable air emissions regulations and determine if additional studies and/or evaluations are necessary. Air sampling will be conducted downwind of the 200 East Area. This site has been chosen as being representative of most large diffuse sources located on the Hanford waste sites. A review of the 1993 ambient air data indicated that {sup 137}C was detectable in this area. This study will take place during February to August of 1995. This time period will enable the collection of sufficient data to assess diffuse radionuclide emissions from the 200 East Area waste sites. This study will use existing ambient air monitoring stations supplemented with temporary air monitoring stations. Plots of the 1993 average concentrations of {sup 137}Cs and {sup 90}Sr collected from the existing stations may be found in Appendix A. Upon completion of this evaluation a recommendation will be made to perform additional sampling studies, or to discontinue further data gathering based on the evaluation`s results.

Schmidt, J.W.; Gleckler, B.P.

1995-01-03T23:59:59.000Z

14

Reducing dust emissions at OAO Alchevskkoks coke battery 10A  

SciTech Connect (OSTI)

Coke battery 10A with rammed batch is under construction at OAO Alchevskkoks. The design documentation developed by Giprokoks includes measures for reducing dust emissions to the atmosphere. Aspiration systems with dry dust trapping are employed in the new components of coke battery 10A and in the existing coke-sorting equipment. Two-stage purification of dusty air in cyclones and bag filters is employed for the coke-sorting equipment. This system considerably reduces coke-dust emissions to the atmosphere.

T.F. Trembach; E.N. Lanina [Giprokoks, the State Institute for the Design of Coke-Industry Enterprises, Kharkov (Ukraine)

2009-07-15T23:59:59.000Z

15

Anomalous radio emission from dust in the Helix  

E-Print Network [OSTI]

A byproduct of experiments designed to map the CMB is the recent detection of a new component of foreground Galactic emission. The anomalous foreground at ~ 10--30 GHz, unexplained by traditional emission mechanisms, correlates with 100um dust emission. We report that in the Helix the emission at 31 GHz and 100um are well correlated, and exhibit similar features on sky images, which are absent in H\\beta. Upper limits on the 250 GHz continuum emission in the Helix rule out cold grains as candidates for the 31 GHz emission, and provide spectroscopic evidence for an excess at 31 GHz over bremsstrahlung. We estimate that the 100um-correlated radio emission, presumably due to dust, accounts for at least 20% of the 31 GHz emission in the Helix. This result strengthens previous tentative interpretations of diffuse ISM spectra involving a new dust emission mechanism at radio frequencies. Very small grains have not been detected in the Helix, which hampers interpreting the new component in terms of spinning dust. The observed iron depletion in the Helix favors considering the identity of this new component to be magnetic dipole emission from hot ferromagnetic grains. The reduced level of free-free continuum we report also implies an electronic temperature of Te=4600\\pm1200K for the free-free emitting material, which is significantly lower than the temperature of 9500\\pm500K inferred from collisionally-excited lines (abridged).

S. Casassus; A. C. S. Readhead; T. J. Pearson; L. -A. Nyman; M. C. Shepherd; L. Bronfman

2003-12-01T23:59:59.000Z

16

Fugitive Emissions | Department of Energy  

Office of Environmental Management (EM)

GHGs such as sulfur hexafluoride (SF6) from DOE operations. SF6 is the most potent GHG, with a global warming potential nearly 24,000 times greater than carbon dioxide (CO2)....

17

Evaluation of fly ash-surfaced pens as a control for fugitive dust emissions from beef cattle feedyards  

E-Print Network [OSTI]

of pens was surfaced with fly ash from a coal-fired power plant, while the other set, surfaced with caliche, served as a control. Five sampling trips were completed for a total of 492 TSP samples and 288 PM10 samples. Results indicate that statistically...

Kantor, Theodore Lee

1995-01-01T23:59:59.000Z

18

Soil organic carbon enrichment of dust emissions: magnitude, mechanisms and its implications for  

E-Print Network [OSTI]

Soil organic carbon enrichment of dust emissions: magnitude, mechanisms and its implications of SOC enrichment in dust emissions is necessary to evaluate the impact of wind erosion on the carbon) across landscapes and soil carbon emissions (van Oost et al., 2007). The dust cycle rep- resents

19

Toward resolution-independent dust emissions in global models: Impacts on the seasonal and spatial distribution of dust  

E-Print Network [OSTI]

Simulating the emission of mineral dust and sea-salt aerosol is nonlinear with surface winds and therefore requires accurate representation of surface winds. Consequently, the resolution of a simulation affects emission ...

Pierce, J. R.

20

Risk assessment for the Waste Technologies Industries (WTI) Hazardous Waste Incineration Facility (East Liverpool, Ohio). Volume 3. Characterization of the nature and magnitude of emissions  

SciTech Connect (OSTI)

Contents: Introduction; Data Used in Characterizing Emissions; Incinerator Stack Emissions; Fugitive Emissions; Uncertainty in Emissions Characterization; and References.

NONE

1997-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "fugitive dust emissions" 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

E-Print Network 3.0 - astrophysical dust emission Sample Search...  

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

EMISSION AROUND IRC 10216 AND VY CANIS MAJORIS J. D. MONNIER,1 W. C. DANCHI,2 D. S. HALE, E. A... recent VY CMa data, implying that emission from the inner dust shell is...

22

Influence of dust on the emissivity of radiant barriers  

E-Print Network [OSTI]

(Figure 5. 2. ) as F Fr-a r-r (22) where N is the number of dust particles considered in the problem and d is the total dust coverage of the barrier. This is valid when a large dust accumulation exists, and the statistical equivalent diameter... is the mean diameter. 31 Surface (Roof) Fr Fr ? i Dust Particles Fr d is calculated to all the dust particles Figure 5. 2. Shape factor from any surface to the dust particles. The shape factors from the surrounding planes (roof deck and gables...

Noboa, Homero Luis

2012-06-07T23:59:59.000Z

23

Modeling dust emissions and transport within Europe: The Ukraine March 2007 event  

E-Print Network [OSTI]

Modeling dust emissions and transport within Europe: The Ukraine March 2007 event Bertrand originating from Ukraine related to chernozemic-erodible lands. Using surface and satellite measurements in the Netherlands, Belgium, and the north of France were mostly due to the extremely rare Ukraine dust event

Menut, Laurent

24

E-Print Network 3.0 - anomalous dust emission Sample Search Results  

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

vs Infall? EAS Publications Series, Vol. ?, 2009 Summary: disks of galaxies: using the gas-to-dust ratio traced by the ratio of infrared emission to H I 21-cm... some time (Koo...

25

Template fitting of WMAP 7-year data: anomalous dust or flattening synchrotron emission?  

E-Print Network [OSTI]

Anomalous microwave emission at 20-40GHz has been detected across our Galactic sky. It is highly correlated with thermal dust emission and hence it is thought to be due to spinning dust grains. Alternatively, this emission could be due to synchrotron radiation with a flattening (hard) spectral index. We cross-correlate synchrotron, free- free and thermal dust templates with the WMAP 7-year maps using synchrotron templates at both 408MHz and 2.3GHz to assess the amount of flat synchrotron emission that is present, and the impact that this has on the correlations with the other components. We find that there is only a small amount of flattening visible in the synchrotron spectral indices by 2.3GHz, of around \\Delta{\\beta} \\approx 0.05, and that the significant level of dust-correlated emission in the lowest WMAP bands is largely unaffected by the choice of synchrotron template, particularly at high latitudes (it decreases by only ~7 per cent when using 2.3 GHz rather than 408 MHz). This agrees with expectation ...

Peel, M W; Davies, R D; Banday, A J; Jaffe, T R; Jonas, J L

2011-01-01T23:59:59.000Z

26

De-dusting Filter Bags Reduce Indian Petcoke Mill Emissions  

Science Journals Connector (OSTI)

BWF Envirotec has installed more than 400 filter bags in a pulse jet clean filter system at an Indian industrial mill producing petroleum coke, a fuel commonly used in rotary kilns for cement production. The pulse jet filter separates the fine grain ‘petcoke’ product from the exhaust gases escaping out of the mill. The installation by the German-based company has reduced the mill’s measured emissions over the last nine months to under 10 mg/Nm3.

2003-01-01T23:59:59.000Z

27

Probing the mass loss history of carbon stars using CO line and dust continuum emission  

E-Print Network [OSTI]

An extensive modelling of CO line emission from the circumstellar envelopes around a number of carbon stars is performed. By combining radio observations and infrared observations obtained by ISO the circumstellar envelope characteristics are probed over a large radial range. In the radiative transfer analysis the observational data are consistently reproduced assuming a spherically symmetric and smooth wind expanding at a constant velocity. The combined data set gives better determined envelope parameters, and puts constraints on the mass loss history of these carbon stars. The importance of dust in the excitation of CO is addressed using a radiative transfer analysis of the observed continuum emission, and it is found to have only minor effects on the derived line intensities. The analysis of the dust emission also puts further constraints on the mass loss rate history. The stars presented here are not likely to have experienced any drastic long-term mass loss rate modulations, at least less than a factor of about 5, over the past thousands of years. Only three, out of nine, carbon stars were observed long enough by ISO to allow a detection of CO far-infrared rotational lines.

F. L. Schoeier; N. Ryde; H. Olofsson

2002-06-05T23:59:59.000Z

28

Dust continuum emission as a tracer of gas mass in galaxies  

E-Print Network [OSTI]

We use a sample of 36 galaxies from the KINGFISH (Herschel IR), HERACLES (IRAM CO), and THINGS (VLA HI) surveys to study empirical relations between Herschel infrared (IR) luminosities and the total mass of the interstellar gas (H2+HI). Such a comparison provides a simple empirical relationship without introducing the uncertainty of dust model fitting. We find tight correlations, and provide fits to these relations, between Herschel luminosities and the total gas mass integrated over entire galaxies, with the tightest, almost linear, correlation found for the longest wavelength data (SPIRE500). However, we find that accounting for the gas-phase metallicity (affecting the dust-to-gas ratio) is crucial when applying these relations to low-mass, and presumably high-redshift, galaxies. The molecular (H2) gas mass is found to be better correlated with the peak of the IR emission (e.g. PACS160), driven mostly by the correlation of stellar mass and mean dust temperature. When examining these relations as a function ...

Groves, Brent A; Leroy, Adam; Galametz, Maud; Walter, Fabian; Bolatto, Alberto; Hunt, Leslie; Dale, Daniel; Calzetti, Daniela; Croxall, Kevin; Kennicutt, Robert

2014-01-01T23:59:59.000Z

29

Leak Detection/Fugitive Emissions Monitoring and Advanced Sensors...  

Energy Savers [EERE]

Models and Platforms Panel November 12, 2014 POUND FOR POUND METHANE TRAPS 84X MORE HEAT OVER 20 YEARS CO2 CH4 Methane is Money 1,800,000,000 Current technologies - economic...

30

EXPLORING MAGNETIC FIELD STRUCTURE IN STAR-FORMING CORES WITH POLARIZATION OF THERMAL DUST EMISSION  

SciTech Connect (OSTI)

The configuration and evolution of the magnetic field in star-forming cores are investigated in order to directly compare simulations and observations. We prepare four different initial clouds having different magnetic field strengths and rotation rates, in which magnetic field lines are aligned/misaligned with the rotation axis. First, we calculate the evolution of such clouds from the prestellar stage until long after protostar formation. Then, we calculate the polarization of thermal dust emission expected from the simulation data. We create polarization maps with arbitrary viewing angles and compare them with observations. Using this procedure, we confirmed that the polarization distribution projected on the celestial plane strongly depends on the viewing angle of the cloud. Thus, by comparing the observations with the polarization map predicted by the simulations, we can roughly determine the angle between the direction of the global magnetic field and the line of sight. The configuration of the polarization vectors also depends on the viewing angle. We find that an hourglass configuration of magnetic field lines is not always realized in a collapsing cloud when the global magnetic field is misaligned with the cloud rotation axis. Depending on the viewing angle, an S-shaped configuration of the magnetic field (or the polarization vectors) appears early in the protostellar accretion phase. This indicates that not only the magnetic field but also the cloud rotation affects the dynamical evolution of such a cloud. In addition, by comparing the simulated polarization with actual observations, we can estimate properties of the host cloud such as the evolutionary stage, magnetic field strength, and rotation rate.

Kataoka, Akimasa [Department of Astronomy, Kyoto University, Sakyo-ku, Kyoto 606-8502 (Japan); Machida, Masahiro N. [Department of Earth and Planetary Science, Kyushu University, Higashi-ku, Fukuoka 812-8581 (Japan); Tomisaka, Kohji [Department of Astronomical Science, School of Physical Sciences, Graduate University for Advanced Studies (SOKENDAI), Osawa 2-21-1, Mitaka, Tokyo 181-8588 (Japan)

2012-12-10T23:59:59.000Z

31

T E C H N I C A L A D V A N C E Soil organic carbon dust emission: an omitted global  

E-Print Network [OSTI]

T E C H N I C A L A D V A N C E Soil organic carbon dust emission: an omitted global source emission, soil organic carbon Received 16 April 2013 and accepted 21 May 2013 Introduction Uncertainty, Gunnedah, NSW 2380, Australia Abstract Soil erosion redistributes soil organic carbon (SOC) within

32

First Detection of UV emission from a Detached Dust Shell: GALEX Observations of the Carbon AGB Star U Hya  

E-Print Network [OSTI]

We present the discovery of an extended ring of ultraviolet emission surrounding the AGB star U Hya in archival observations performed by the Galaxy Evolution Explorer (GALEX). This is the third discovery of extended UV emission from a carbon AGB star and the first from an AGB star with a detached shell. From imaging and photometric analysis of the FUV and NUV images, we determined that the ultraviolet ring has a radius of $\\sim 110^{\\prime\\prime}$, thus indicating that the emitting material is likely associated with the detached shell seen in the infrared. We find that scattering of the central point source of NUV and FUV emission by the dust shell is negligible. Moreover, we find that scattering of the interstellar radiation field by the dust shell can contribute at most $\\sim10%$ of the FUV flux. Morphological and photometric evidence suggests that shocks caused by the star's motion through space and, possibly, shock-excited H$_2$ molecules are the most likely origins of the UV flux. In contrast to previou...

Sanchez, E; Ramstedt, S; Stassun, K G

2014-01-01T23:59:59.000Z

33

Near-IR dust and line emission from the central region of Mrk1066: Constraints from Gemini NIFS  

E-Print Network [OSTI]

We present integral field spectroscopy of the inner 350 pc of the Mrk1066 obtained with Gemini NIFS at a spatial resolution of 35 pc. This high spatial resolution allowed us to observe, for the first time in this galaxy, an unresolved dust concentration with mass 0.014 M_Sun, which may be part of the dusty torus. The emission-line fluxes are elongated in PA=135/315deg in agreement with the [OIII] and radio images and, except for the H lines, are brighter to the north-west than to the south-east. The H emission is stronger to the south-east, where we find a large region of star-formation. The strong correlation between the radio emission and the highest emission-line fluxes indicates that the radio jet plays a fundamental role at these intensity levels. The H2 flux is more uniformly distributed and has an excitation temperature of 2100 K. Its origin appears to be circumnuclear gas heated by X-rays from the AGN. The [FeII] emission also is consistent with X-ray heating, but with additional emission due to excit...

Riffel, Rogemar A; Nagar, Neil M

2010-01-01T23:59:59.000Z

34

CAN DUST EMISSION BE USED TO ESTIMATE THE MASS OF THE INTERSTELLAR MEDIUM IN GALAXIES-A PILOT PROJECT WITH THE HERSCHEL REFERENCE SURVEY  

SciTech Connect (OSTI)

The standard method for estimating the mass of the interstellar medium (ISM) in a galaxy is to use the 21 cm line to trace the atomic gas and the CO 1-0 line to trace the molecular gas. In this paper, we investigate the alternative technique of using the continuum dust emission to estimate the mass of gas in all phases of the ISM. Using Herschel observations of 10 galaxies from the Herschel Reference Survey and the Herschel Virgo Cluster Survey, we show that the emission detected by Herschel is mostly from dust that has a temperature and emissivity index similar to that of dust in the local ISM in our galaxy, with the temperature generally increasing toward the center of each galaxy. We calibrate the dust method using the CO and 21 cm observations to provide an independent estimate of the mass of hydrogen in each galaxy, solving the problem of the uncertain ''X-factor'' for the CO observations by minimizing the dispersion in the ratio of the masses estimated using the two methods. With the calibration for the dust method and the estimate of the X-factor produced in this way, the dispersion in the ratio of the two gas masses is 25%. The calibration we obtain for the dust method is similar to those obtained from Herschel observations of M31 and from Planck observations of the Milky Way. We discuss the practical problems in using this method.

Eales, Stephen; Smith, Matthew W. L.; Auld, Robbie; Davies, Jon; Gear, Walter; Gomez, Haley [School of Physics and Astronomy, Cardiff University, Queens Buildings, The Parade, Cardiff CF24 3AA (United Kingdom); Baes, Maarten; De Looze, Ilse; Gentile, Gianfranco; Fritz, Jacopo [Sterrenkundig Observatorium, Universiteit Gent, Krijgslaan 281 S9, B-9000 Gent (Belgium); Bendo, George J. [UK ALMA Regional Centre Node, Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL (United Kingdom); Bianchi, Simone [INAF-Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze (Italy); Boselli, Alessandro; Ciesla, Laure [Laboratoire d'Astrophysique de Marseilles, UMR6110 CNRS, 38 rue F. Joliot-Curie, F-1338 Marseilles (France); Clements, David [Astrophysics Group, Imperial College, Blackett Lab, Prince Consort Road, London SW7 2AZ (United Kingdom); Cooray, Asantha [Department of Physics and Astronomy, University of California, Irvine, CA 92697 (United States); Cortese, Luca [European Southern Observatory, Karl-Schwarzschild-Strasse 2 D-85748, Garching bei Munchen (Germany); Galametz, Maud [Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA (United Kingdom); Hughes, Tom [Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871 (China); Madden, Suzanne [Laboratoire AIM, CEA/DSM-CNRS-Universite Paris Diderot, Irfu/Service d'Astrophysique, F-91191 Gif sur Yvette (France); and others

2012-12-20T23:59:59.000Z

35

A science based emission factor for particulate matter emitted from cotton harvesting  

E-Print Network [OSTI]

practice plans detailing the actions taken by the producer to reduce fugitive PM emissions from field operations. The objective of this work was to develop accurate PM emission factors for cotton harvesting in terms of total suspended particulate (TSP), PM...

Wanjura, John David

2009-05-15T23:59:59.000Z

36

The dust sublimation radius as an outer envelope to the bulk of the narrow Fe Kalpha line emission in Type 1 AGN  

E-Print Network [OSTI]

The Fe Kalpha emission line is the most ubiquitous feature in the X-ray spectra of active galactic nuclei (AGN), but the origin of its narrow core remains uncertain. Here, we investigate the connection between the sizes of the Fe Kalpha core emission regions and the measured sizes of the dusty tori in 13 local Type 1 AGN. The observed Fe Kalpha emission radii (R_fe) are determined from spectrally resolved line widths in X-ray grating spectra, and the dust sublimation radii (R_dust) are measured either from optical/near-infrared reverberation time lags or from resolved near-infrared interferometric data. This direct comparison shows that the dust sublimation radius forms an outer envelope to the bulk of the Fe Kalpha emission. R_fe matches R_dust well in the AGN with the best constrained line widths currently. In a significant fraction of objects without a clear narrow line core, R_fe is similar to, or smaller than the radius of the optical broad line region. These facts place important constraints on the toru...

Gandhi, Poshak; Kishimoto, Makoto

2015-01-01T23:59:59.000Z

37

HerMES: THE FAR-INFRARED EMISSION FROM DUST-OBSCURED GALAXIES  

SciTech Connect (OSTI)

Dust-obscured galaxies (DOGs) are an ultraviolet-faint, infrared-bright galaxy population that reside at z ? 2 and are believed to be in a phase of dusty star-forming and active galactic nucleus (AGN) activity. We present far-infrared (far-IR) observations of a complete sample of DOGs in the 2 deg{sup 2} of the Cosmic Evolution Survey. The 3077 DOGs have (z) = 1.9 ± 0.3 and are selected from 24 ?m and r {sup +} observations using a color cut of r {sup +} – [24] ? 7.5 (AB mag) and S{sub 24} ? 100 ?Jy. Based on the near-IR spectral energy distributions, 47% are bump DOGs (star formation dominated) and 10% are power-law DOGs (AGN-dominated). We use SPIRE far-IR photometry from the Herschel Multi-tiered Extragalactic Survey to calculate the IR luminosity and characteristic dust temperature for the 1572 (51%) DOGs that are detected at 250 ?m (?3?). For the remaining 1505 (49%) that are undetected, we perform a median stacking analysis to probe fainter luminosities. Herschel-detected and undetected DOGs have average luminosities of (2.8 ± 0.4) × 10{sup 12} L{sub ?} and (0.77 ± 0.08) × 10{sup 12} L{sub ?}, and dust temperatures of (33 ± 7) K and (37 ± 5) K, respectively. The IR luminosity function for DOGs with S{sub 24} ? 100 ?Jy is calculated, using far-IR observations and stacking. DOGs contribute 10%-30% to the total star formation rate (SFR) density of the universe at z = 1.5-2.5, dominated by 250 ?m detected and bump DOGs. For comparison, DOGs contribute 30% to the SFR density for all z = 1.5-2.5 galaxies with S{sub 24} ? 100 ?Jy. DOGs have a large scatter about the star formation main sequence and their specific SFRs show that the observed phase of star formation could be responsible for their total observed stellar mass at z ? 2.

Calanog, J. A.; Wardlow, J.; Fu, Hai; Cooray, A. [Department of Physics and Astronomy, University of California, Irvine, CA 92697 (United States); Assef, R. J. [Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109 (United States); Bock, J.; Riechers, D.; Schulz, B. [California Institute of Technology, 1200 E. California Boulevard, Pasadena, CA 91125 (United States); Casey, C. M. [Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822 (United States); Conley, A. [Center for Astrophysics and Space Astronomy 389-UCB, University of Colorado, Boulder, CO 80309 (United States); Farrah, D.; Oliver, S. J.; Roseboom, I. G. [Astronomy Centre, Department of Physics and Astronomy, University of Sussex, Brighton BN1 9QH (United Kingdom); Ibar, E. [Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22 (Chile); Kartaltepe, J. [National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719 (United States); Magdis, G.; Rigopoulou, D. [Department of Astrophysics, Denys Wilkinson Building, University of Oxford, Keble Road, Oxford OX1 3RH (United Kingdom); Marchetti, L. [Department of Physical Sciences, The Open University, Milton Keynes MK7 6AA (United Kingdom); Pérez-Fournon, I. [Instituto de Astrofísica de Canarias (IAC), E-38200 La Laguna, Tenerife (Spain); Scott, Douglas [Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1 (Canada); and others

2013-09-20T23:59:59.000Z

38

Characterization of diffuse emissions from the Clinton P. Anderson Meson Physics Facility (LAMPF), Los Alamos National Laboratory, New Mexico  

E-Print Network [OSTI]

of air that are discharged up a stack that is monitored to determine total activity released. Recently, EPA regulators expressed concern over diffuse emissions (often called fugitive emissions) escaping from the facility by pathways other than the stack...

Montgomery, Noel Davis

2012-06-07T23:59:59.000Z

39

Characterisation for some emission sources in CMB calculation for Mae Moh area, Thailand  

Science Journals Connector (OSTI)

Particulate samples of agricultural waste burning, straw burning, forest leaf burning, heavy duty truck emission, paved road dust, soil, agricultural soil, coal, electrostatic precipitator ash, and emission from stack power plant were collected from the Mae Moh area. Chemical compositions of sampling filters were analysed to determine the particulate matter source profiles. The analysis included ICP-MS for elemental compositions, ion chromatography for water soluble ions and CHNS/O for carbon species. In all biomass burning profiles organic carbon (OC) was higher during smouldering phase, while elemental carbon (EC) was higher during flaming phase. Results relating to biomass emission during flaming stage showed increase in K+. Organic and elemental carbons were the most abundant in biomass burning and truck exhaust. The abundance of EC was much lower, and the abundance of OC was much higher in biomass burning relative to truck exhaust emission. Al, K, Mg, Ca, and Fe were presented with high abundance in road dust, soil, coal, fly ash and stack samples. The differences in chemical compositions were not sufficient to distinguish geological material and fugitive dust sources. Fly ash profile differed from the others since OC and EC were not detected. Na and Zn were most abundant in stack samples. These findings served as a starting point for source contribution study. For future application of source apportionment using the CMB modelling technique, these source profiles should be appropriately grouped and selected to generate reliable outcomes.

A. Wangkiat; N.W. Harvey; S. Okamoto; S. Wangwongwatana; P. Rachdawong

2004-01-01T23:59:59.000Z

40

Dust Plume Modeling at Fort Bliss: Full Training Scenario  

SciTech Connect (OSTI)

The potential for air quality impacts from heavy mechanized vehicles operating in the training ranges and on the unpaved main supply routes at Fort Bliss is being investigated. The investigation uses the atmospheric modeling system DUSTRAN to simulate fugitive dust emission and dispersion from typical activities occurring on the installation. This report conveys the results of DUSTRAN simulations conducted using a “Full Training” scenario developed by Fort Bliss personnel. he Full Training scenario includes simultaneous off-road activities of two full Heavy Brigade Combat Teams (HCBTs) and one HCBT battalion on three training ranges. Simulations were conducted for the six-day period, April 25-30, 2005, using previously archived meteorological records. Simulation results are presented in the form of 24-hour average PM10 plots and peak 1-hour PM10 concentration plots, where the concentrations represent contributions resulting from the specified military vehicular activities, not total ambient PM10 concentrations. Results indicate that the highest PM10 contribution concentrations occurred on April 30 when winds were light and variable. Under such conditions, lofted particulates generated by vehicular movement stay in the area of generation and are not readily dispersed. The effect of training duration was investigated by comparing simulations with vehicular activity extending over a ten hour period (0700 to 1700 MST) with simulations where vehicular activity was compressed into a one hour period (0700 to 0800 MST). Compressing all vehicular activity into one hour led to higher peak one-hour and 24-hour average concentration contributions, often substantially higher.

Chapman, Elaine G.; Rishel, Jeremy P.; Rutz, Frederick C.; Seiple, Timothy E.; Newsom, Rob K.; Allwine, K Jerry

2006-09-26T23:59:59.000Z

Note: This page contains sample records for the topic "fugitive dust emissions" 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

E-Print Network 3.0 - asymmetric dust shell Sample Search Results  

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

blue-shifted emission lines, because the dust obscures more emission from receding gas; and (iii... is much faster than that expected for a typical circumstellar dust shell...

42

Risk assessment for the Waste Technologies Industries (WTI) hazardous waste incinerator facility (east Liverpool, Ohio). Volume 3. Characterization of the nature and magnitude of emissions. Draft report  

SciTech Connect (OSTI)

This report constitutes a comprehensive site-specific risk assessment for the WTI incineration facility located in East Liverpool, OH. Volume III of the report describes the methods used to estimate both stack and fugitive emission rates from the facility.

NONE

1995-11-01T23:59:59.000Z

43

Nondetection of impulsive radio signals from lightning in Martian dust storms using the radar receiver on  

E-Print Network [OSTI]

emission from a Martian dust storm that they attribute to the excitation of Schumann [1952] resonances

Gurnett, Donald A.

44

Utilization of Lignite Reserves and Simultaneous Improvement of Dust Emissions and Operation Efficiency of a Power Plant by Controlling the Calcium (Total and Free) Content of the Fed Lignite. Application on the Agios Dimitrios Power Plant, Ptolemais, Greece  

Science Journals Connector (OSTI)

Utilization of Lignite Reserves and Simultaneous Improvement of Dust Emissions and Operation Efficiency of a Power Plant by Controlling the Calcium (Total and Free) Content of the Fed Lignite. ... Using the technique mentioned above, by determining the lignite recoverable blocks and progressively improving the mixing of the lignites with different qualities, the solid particle emissions were generally stabilized and reduced (lower than 150 mg m-3), with the best improvement observed around April 1999 and afterward (Figures 2?5). ...

Nestoras Kolovos; Andreas Georgakopoulos; Anestis Filippidis; Constantinos Kavouridis

2002-09-11T23:59:59.000Z

45

E-Print Network 3.0 - african dust measured Sample Search Results  

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

Sciences and Ecology ; Geosciences 3 Sensitivity of regional dust modelling to the wind speed and the emissions schemes: Impact on the hourly dust previsibility Summary: with...

46

E-Print Network 3.0 - airborne house dust Sample Search Results  

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

of regional dust modelling to the wind speed and the emissions schemes: Impact... on the hourly dust previsibility Laurent MENUT (1), Cyril MOULIN (2), Isabelle CHIAPELLO (3)...

47

Assessing the effect of stocking density on fugitive PM10 emissions from cattle feedyards  

E-Print Network [OSTI]

feedyards. Ambient sampling was conducted over a one-year period, using Federal Reference Methods to measure particulate matter concentrations from two treatments. Five sampling trips produced 30 sampling data sets comparing 13.9 and 7.0 m²/hd (150 and 75...

Romanillos, Arturo

2000-01-01T23:59:59.000Z

48

Flying dust  

Science Journals Connector (OSTI)

... So, says Daedalus, a fluidized mass of hot dust is a sort of mobile Stirling engine, driven along by its own heat. This bold

David Jones

1992-05-14T23:59:59.000Z

49

E-Print Network 3.0 - african mineral dust Sample Search Results  

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

mineral dust Page: << < 1 2 3 4 5 > >> 1 Sensitivity of regional dust modelling to the wind speed and the emissions schemes: Impact on the hourly dust previsibility Summary:...

50

Improve emissions monitoring  

SciTech Connect (OSTI)

Marathon`s Texas City refinery was subject to five separate EPA regulations in addition to a state program for monitoring and repairing fugitive leaks. In this case history, the refinery sought an organizational solution that reduced monitoring costs and kept the facility fully compliant with current state and federal regulations. Equally important, the new monitoring program incorporated flexibility for future emission-reduction requirements. The paper describes the solution, regulatory background, the previous system, leak-threshold consolidation, operator ownership, and projects benefits.

Vining, S.K. [Marathon Oil Co., Texas City, TX (United States)

1998-01-01T23:59:59.000Z

51

Emissions  

Office of Scientific and Technical Information (OSTI)

the extra emissions that are generated from manufacturing the material used to make CNG tanks); they can amount tc more than 2% of the emissions from 32 the fuel production and...

52

Molten Metal Treatment by Salt Fluxing with Low Environmental Emissions  

SciTech Connect (OSTI)

Abstract: Chlorine gas is traditionally used for fluxing of aluminum melt for removal of alkali and alkaline earth elements. However this results in undesirable emissions of particulate matter and gases such as HCl and chlorine, which are often at unacceptable levels. Additionally, chlorine gas is highly toxic and its handling, storage, and use pose risks to employees and the local community. Holding of even minimal amounts of chlorine necessitates extensive training for all plant employees. Fugitive emissions from chlorine usage within the plant cause accelerated corrosion of plant equipment. The Secondary Aluminum Maximum Achievable Control Technology (MACT) under the Clean Air Act, finalized in March 2000 has set very tough new limits on particulate matter (PM) and total hydrogen chloride emissions from aluminum melting and holding furnaces. These limits are 0.4 and 0.1 lbs per ton of aluminum for hydrogen chloride and particulate emissions, respectively. Assuming new technologies for meeting these limits can be found, additional requirements under the Clean Air Act (Prevention of Significant Deterioration and New Source Review) trigger Best Available Control Technology (BACT) for new sources with annual emissions (net emissions not expressed per ton of production) over specified amounts. BACT currently is lime coated bag-houses for control of particulate and HCl emissions. These controls are expensive, difficult to operate and maintain, and result in reduced American competitiveness in the global economy. Solid salt fluxing is emerging as a viable option for the replacement of chlorine gas fluxing, provided emissions can be consistently maintained below the required levels. This project was a cooperative effort between the Ohio State University and Alcoa to investigate and optimize the effects of solid chloride flux addition in molten metal for alkali impurity and non-metallic inclusion removal minimizing dust and toxic emissions and maximizing energy conservation. In this program, the salt metal interactions were studies and the emissions at laboratory scale at OSU were monitored. The goal of the project was to obtain a fundamental understanding, based on first principles, of the pollutant formation that occurs when the salts are used in furnaces. This information will be used to control process parameters so that emissions are consistently below the required levels. The information obtained in these experiments will be used in industrial furnaces at aluminum plants and which will help in optimizing the process.

Yogeshwar Sahai

2007-07-31T23:59:59.000Z

53

Wood Dusts  

Science Journals Connector (OSTI)

Abstract The processing of wood is common in many types of work, and generates wood dust that has been associated with acute and chronic health effects. Workers exposed to wood dust may have adverse health effects such as upper and lower respiratory symptoms, decreased lung function, asthma, contact and allergic dermatitis, idiopathic pulmonary fibrosis, and sinonasal and nasopharyngeal cancer. This article is a revision of the previous edition article by Alan J. Weinrich and Paul Demers, volume 4, pp 464–467, © 2005, Elsevier Inc.

P.A. Demers; A.J. Weinrich

2014-01-01T23:59:59.000Z

54

Inter-comparison between HERMESv2.0 and TNO-MACC-II emission data using the CALIOPE air quality system (Spain)  

Science Journals Connector (OSTI)

Abstract This work examines and compares the performance of two emission datasets on modelling air quality concentrations for Spain: (i) the High-Elective Resolution Modelling Emissions System (HERMESv2.0) and (ii) the TNO-MACC-II emission inventory. For this purpose, the air quality system CALIOPE-AQFS (WRF-ARW/CMAQ/BSC-DREAM8b) was run over Spain for February and June 2009 using the two emission datasets (4 km × 4 km and 1 h). Nitrogen dioxide (NO2), sulphur dioxide (SO2), Ozone (O3) and particular matter (PM10) modelled concentrations were compared with measurements at different type of air quality stations (i.e. rural background, urban, suburban industrial). A preliminary emission comparison showed significant discrepancies between the two datasets, highlighting an overestimation of industrial emissions in urban areas when using TNO-MACC-II. However, simulations showed similar performances of both emission datasets in terms of air quality. Modelled NO2 concentrations were similar between both datasets at the background stations, although TNO-MACC-II presented lower underestimations due to differences in industrial, other mobile sources and residential emissions. At Madrid urban stations NO2 was significantly underestimated in both cases despite the fact that HERMESv2.0 estimates traffic emissions using a more local information and detailed methodology. This NO2 underestimation problem was not found in Barcelona due to the influence of international shipping emissions located in the coastline. An inadequate characterization of some TNO-MACC-II's point sources led to high SO2 biases at industrial stations, especially in northwest Spain where large facilities are grouped. In general, surface O3 was overestimated regardless of the emission dataset used, depicting the problematic of CMAQ on overestimating low ozone at night. On the other hand, modelled PM10 concentrations were less underestimated in urban areas when applying HERMESv2.0 due to the inclusion of road dust resuspension, whereas the underestimation at suburban industrial stations indicated deficiencies in fugitive emission sources characterization (agricultural operations, windblown dust emissions).

Marc Guevara; María Teresa Pay; Francesc Martínez; Albert Soret; Hugo Denier van der Gon; José M. Baldasano

2014-01-01T23:59:59.000Z

55

Emissions inventories for MSW landfills under Title V  

SciTech Connect (OSTI)

In the past, many states were either not concerned with, or unaware that, municipal solid waste landfills (MSWLFs) were potential sources of regulated air pollutants. This philosophy is rapidly changing, in part due to US EPA policy documents concerning (and defining) fugitive and non-fugitive emissions from MSWLFs, the attention given to the newly released New Source Performance Standards and a recent lawsuit that gained national notoriety involving landfill air emissions and air permitting applicability issues. Most states now recognize that MSWLFs are sources of regulated air pollutants and are subject to permitting requirements (and pollutant emission fees) as other industries; i.e., state-level minor- and major-source operating permit programs, and the 1990 Clean Air Act Amendments Title V Operating Permits Program (Title V).

Vogt, W.G. [SCS Engineers, Reston, VA (United States); Peyser, T.R. [SCS Engineers, Birmingham, AL (United States); Hamilton, S.M. [SCS Engineers, Tampa, FL (United States)

1996-05-01T23:59:59.000Z

56

Session EP23A. Aeolian Processes and Desert Landscape Development Impact of surface roughness and soil texture on mineral dust emission fluxes modeling  

E-Print Network [OSTI]

) · Meteorology using WRF and use of a Weibull wind speed distribution · Transport using CHIMERE The main sources models. Modeling of the period of March to July of 2011 with WRF and CHIMERE : · Models : WRF as a function of its use in local to global meteorological and dust transport models Comparison

Menut, Laurent

57

Evolution of the dust emission of massive galaxies up to z=4 and constraints on their dominant mode of star formation  

E-Print Network [OSTI]

We aim to measure the average dust and molecular gas content of massive star-forming galaxies ($\\rm > 3 \\times 10^{10}\\,M_\\odot$) up to z=4 in the COSMOS field to determine if the intense star formation observed at high redshift is induced by major mergers or caused by large gas reservoirs. Firstly, we measured the evolution of the average spectral energy distributions as a function of redshift using a stacking analysis of Spitzer, Herschel, LABOCA, and AzTEC data for two samples of galaxies: normal star-forming objects and strong starbursts, as defined by their distance to the main sequence. We found that the mean intensity of the radiation field $\\langle U \\rangle$ heating the dust (strongly correlated with dust temperature) increases with increasing redshift up to z$\\sim$4 in main-sequence galaxies. We can reproduce this evolution with simple models that account for the decrease of the gas metallicity with redshift. No evolution of $\\langle U \\rangle$ with redshift is found in strong starbursts. We then de...

Béthermin, Matthieu; Magdis, Georgios; Lagos, Claudia; Sargent, Mark; Albrecht, Marcus; Aussel, Hervé; Bertoldi, Frank; Buat, Véronique; Galametz, Maud; Heinis, Sébastien; Karim, Alexander; Koekemoer, Anton; Lacey, Cedric; Floc'h, Emeric Le; Navarrete, Felipe; Pannella, Maurilio; Schreiber, Corentin; Symeonidis, Myrto; Viero, Marco

2014-01-01T23:59:59.000Z

58

Multiwavelength Thermal Emission  

E-Print Network [OSTI]

Multiwavelength Astronomy NASA #12;Thermal Emission #12;Thermal Emission Non-thermal p-p collisions Optical IR Radio/ Microwave sources of emission massive stars, WHIM, Ly many dust, cool objects-ray ~GeV Gamma-ray ~TeV sources of emission AGN, clusters, SNR, binaries, stars AGN (obscured), shocks

California at Santa Cruz, University of

59

Control technology of vinyl chloride in EDC-VCM and PVC plants at main source points and fugitive emissions  

E-Print Network [OSTI]

for the adsorption step and vacuum and indirect steam heating for the regeneration step (see Figure 3). There are two possible mechanisms for thermal cycles; indirect heating by jacket or steam coils, and direct heating with a hot purge gas, which most often... of rupture discs upstream of relief valves, double seals in compressors and pumps, and the establishment of an effective procedure of monitoring to identify leaks, development of an adequate maintenance program, installation of a fixed point monitor...

Parra, Dario Antonio

1983-01-01T23:59:59.000Z

60

Niamey Dust Observations  

DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

Niamey aerosol are composed of two main components: dust due to the proximity of the Sahara Desert, and soot from local and regional biomass burning. The purpose of this data product is to identify when the local conditions are dominated by the dust component so that the properties of the dust events can be further studied.

Flynn, Connor

Note: This page contains sample records for the topic "fugitive dust emissions" 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

Radioactivity of Dust  

Science Journals Connector (OSTI)

... it would be interesting to investigate in the same way the behaviour of atoms of radon and its disintegration products contained in air. The dust from air containing 1-5 ... . The dust from air containing 1-5 X 10 u curie/c.c. of radon was deposited in the form of a dust spot (Fig. 1) on a ...

Č. JECH

1949-04-09T23:59:59.000Z

62

Pacific Northwest National Laboratory Campus Radionuclide Air Emissions Report for Calendar Year 2013  

SciTech Connect (OSTI)

This report documents radionuclide air emissions that result in the highest effective dose equivalent (EDE) to a member of the public, referred to as the maximally exposed individual (MEI). The report has been prepared in compliance with the Code of Federal Regulations (CFR), Title 40, Protection of the Environment, Part 61, National Emission Standards for Hazardous Air Pollutants (NESHAP), Subpart H, National Emission Standards for Emissions of Radionuclides Other than Radon from Department of Energy Facilities and Washington Administrative Code (WAC) Chapter 246-247, Radiation Protection Air Emissions. The dose to the PNNL Site MEI due to routine major and minor point source emissions in 2013 from PNNL Site sources is 2E-05 mrem (2E-07 mSv) EDE. The dose from fugitive emissions (i.e., unmonitored sources) is 2E-6 mrem (2E-8 mSv) EDE. The dose from radon emissions is 1E-11 mrem (1E-13 mSv) EDE. No nonroutine emissions occurred in 2013. The total radiological dose for 2013 to the MEI from all PNNL Site radionuclide emissions, including fugitive emissions and radon, is 2E-5 mrem (2E-7 mSv) EDE, or 100,000 times smaller than the federal and state standard of 10 mrem/yr, to which the PNNL Site is in compliance

Snyder, Sandra F.; Barnett, J. M.; Bisping, Lynn E.

2014-06-01T23:59:59.000Z

63

COLD DUST BUT WARM GAS IN THE UNUSUAL ELLIPTICAL GALAXY NGC 4125  

SciTech Connect (OSTI)

Data from the Herschel Space Observatory have revealed an unusual elliptical galaxy, NGC 4125, which has strong and extended submillimeter emission from cold dust but only very strict upper limits to its CO and H I emission. Depending on the dust emissivity, the total dust mass is 2-5 × 10{sup 6} M {sub ?}. While the neutral gas-to-dust mass ratio is extremely low (<12-30), including the ionized gas traced by [C II] emission raises this limit to <39-100. The dust emission follows a similar r {sup 1/4} profile to the stellar light and the dust to stellar mass ratio is toward the high end of what is found in nearby elliptical galaxies. We suggest that NGC 4125 is currently in an unusual phase where evolved stars produced in a merger-triggered burst of star formation are pumping large amounts of gas and dust into the interstellar medium. In this scenario, the low neutral gas-to-dust mass ratio is explained by the gas being heated to temperatures ?10{sup 4} K faster than the dust is evaporated. If galaxies like NGC 4125, where the far-infrared emission does not trace neutral gas in the usual manner, are common at higher redshift, this could have significant implications for our understanding of high redshift galaxies and galaxy evolution.

Wilson, C. D.; Cridland, A.; Foyle, K.; Parkin, T. J.; Cooper, E. Mentuch [Department of Physics and Astronomy, McMaster University, Hamilton, ON L8S 4M1 (Canada)] [Department of Physics and Astronomy, McMaster University, Hamilton, ON L8S 4M1 (Canada); Roussel, H. [Institut d'Astrophysique de Paris, Université Pierre et Marie Curie, CNRS UMR 7095, F-75014 Paris (France)] [Institut d'Astrophysique de Paris, Université Pierre et Marie Curie, CNRS UMR 7095, F-75014 Paris (France); Sauvage, M.; Lebouteiller, V.; Madden, S. [Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot DAPNIA/Service d'Astrophysique, Bât. 709, CEA-Saclay, F-91191 Gif-sur-Yvette Cedex (France)] [Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot DAPNIA/Service d'Astrophysique, Bât. 709, CEA-Saclay, F-91191 Gif-sur-Yvette Cedex (France); Smith, M. W. L.; Gear, W. [School of Physics and Astronomy, Cardiff University, The Parade, Cardiff CF24 3AA (United Kingdom)] [School of Physics and Astronomy, Cardiff University, The Parade, Cardiff CF24 3AA (United Kingdom); Baes, M.; De Looze, I. [Sterrenkundig Observatorium, Universiteit Gent, Krijgslaan 281 S9, B-9000 Gent (Belgium)] [Sterrenkundig Observatorium, Universiteit Gent, Krijgslaan 281 S9, B-9000 Gent (Belgium); Bendo, G. [UK ALMA Regional Centre Node, Jodrell Bank Center for Astrophysics, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL (United Kingdom)] [UK ALMA Regional Centre Node, Jodrell Bank Center for Astrophysics, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL (United Kingdom); Boquien, M.; Boselli, A.; Ciesla, L. [Aix-Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, F-13388 Marseille (France)] [Aix-Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, F-13388 Marseille (France); Clements, D. L. [Astrophysics Group, Imperial College London, Blackett Laboratory, Prince Consort Road, London SW7 2AZ (United Kingdom)] [Astrophysics Group, Imperial College London, Blackett Laboratory, Prince Consort Road, London SW7 2AZ (United Kingdom); Cooray, A. [Department of Physics and Astronomy, University of California, Irvine, CA 92697 (United States)] [Department of Physics and Astronomy, University of California, Irvine, CA 92697 (United States); Galametz, M. [Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA (United Kingdom)] [Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA (United Kingdom); and others

2013-10-20T23:59:59.000Z

64

Comparison of Life Cycle Carbon Dioxide Emissions and Embodied Energy in Four Renewable Electricity Generation Technologies in New Zealand  

Science Journals Connector (OSTI)

Comparison of Life Cycle Carbon Dioxide Emissions and Embodied Energy in Four Renewable Electricity Generation Technologies in New Zealand ... Fugitive emissions from geothermal fields were noted, though not added to the result for geothermal power generation, but all other “CO2 emissions” pertaining to this study arose from construction, maintenance, and decommissioning of power stations, since renewable technologies (apart from geothermal) do not emit CO2 during normal operation. ... Hondo, H. Life cycle GHG emission analysis of power generation systems: Japanese case Energy 2005, 30 ( 11?12 SPEC. ...

Bridget M. Rule; Zeb J. Worth; Carol A. Boyle

2009-07-16T23:59:59.000Z

65

Anomalous Emission from HII regions  

E-Print Network [OSTI]

Spinning dust appears to be the best explanation for the anomalous emission that has been observed at $\\sim 10-60$ GHz. One of the best examples of spinning dust comes from a HII region in the Perseus molecular cloud. Observations of other HII regions also show tentative evidence for excess emission at frequencies $\\sim 30$ GHz, although at lower emissivity levels. A new detection of excess emission at 31 GHz in the HII region RCW175 has been made. The most plausible explanation again comes from spinning dust. HII regions are a good place to look for spinning dust as long as accurate radio data spanning the $\\sim 5-100$ GHz range is available.

C. Dickinson

2008-08-04T23:59:59.000Z

66

Cool dust heating and temperature mixing in nearby star-forming galaxies  

E-Print Network [OSTI]

Physical conditions of the interstellar medium in galaxies are closely linked to the ambient radiation field and the heating of dust grains. In order to characterize dust properties in galaxies over a wide range of physical conditions, we present here the radial surface brightness profiles of the entire sample of 61 galaxies from Key Insights into Nearby Galaxies: Far-Infrared Survey with Herschel (KINGFISH). The main goal of our work is the characterization of the grain emissivities, dust temperatures, and interstellar radiation fields responsible for heating the dust. After fitting the dust and stellar radial profiles with exponential functions, we fit the far-infrared spectral energy distribution (SED) in each annular region with single-temperature modified black bodies using both variable (MBBV) and fixed (MBBF) emissivity indices beta, as well as with physically motivated dust models. Results show that while most SED parameters decrease with radius, the emissivity index beta also decreases with radius in...

Hunt, L K; Bianchi, S; Gordon, K D; Aniano, G; Calzetti, D; Dale, D A; Helou, G; Hinz, J L; Kennicutt, R C; Roussel, H; Wilson, C D; Bolatto, A; Boquien, M; Croxall, K V; Galametz, M; de Paz, A Gil; Koda, J; Munoz-Mateos, J C; Sandstrom, K M; Sauvage, M; Vigroux, L; Zibetti, S

2014-01-01T23:59:59.000Z

67

The ecology of dust: local- to global-scale perspectives  

SciTech Connect (OSTI)

Emission and redistribution of dust due to wind erosion in drylands drives major biogeochemical dynamics and provides important aeolian environmental connectivity at scales from individual plants up to the global scale. Yet, perhaps because most relevant research on aeolian processes has been presented in a geosciences rather than ecological context, most ecological studies do not explicitly consider dust-driven processes. To bridge this disciplinary gap, we provide a general overview of the ecological importance of dust, examine complex interactions between wind erosion and ecosystem dynamics from the plant-interspace scale to regional and global scales, and highlight specific examples of how disturbance affects these interactions and their consequences. Changes in climate and intensification of land use will both likely lead to increased dust production. To address these challenges, environmental scientists, land managers and policy makers need to more explicitly consider dust in resource management decisions.

Whicker, Jeffrey J [Los Alamos National Laboratory; Field, Jason P [UA; Belnap, Jayne [NON LANL; Breshears, David D [UA; Neff, Jason [CU; Okin, Gregory S [UCLA; Painter, Thomas H [UNIV OF ARIZONA; Ravi, Sujith [UNIV OF ARIZONA; Reheis, Marith C [UCLA; Reynolds, Richard L [NON LANL

2009-01-01T23:59:59.000Z

68

Cotton Gin Dust Explosibility Determinations  

E-Print Network [OSTI]

personnel listed dust found in cotton gins, or gin dust, fueled two explosions in the past. OSHA is required by law to regulate facilities handling explosible dusts to provide a safe working environment for employees. The dust handling facilities must test...

Vanderlick, Francis Jerome

2014-01-06T23:59:59.000Z

69

Coal dust explosibility  

Science Journals Connector (OSTI)

This paper reports US Bureau of Mines (USBM) research on the explosibility of coal dusts. The purpose of this work is to improve safety in mining and other industries that process or use coal. Most of the tests were conducted in the USBM 20 litre laboratory explosibility chamber. The laboratory data show relatively good agreement with those from full-scale experimental mine tests. The parameters measured included minimum explosible concentrations, maximum explosion pressures, maximum rates of pressure rise, minimum oxygen concentrations, and amounts of limestone rock dust required to inert the coals. The effects of coal volatility and particle size were evaluated, and particle size was determined to be at least as important as volatility in determining the explosion hazard. For all coals tested, the finest sizes were the most hazardous. The coal dust explosibility data are compared to those of other hydrocarbons, such as polyethylene dust and methane gas, in an attempt to understand better the basics of coal combustion.

Kenneth L. Cashdollar

1996-01-01T23:59:59.000Z

70

Practical guide: Tools and methodologies for an oil and gas industry emission inventory  

SciTech Connect (OSTI)

During the preparation of Title V Permit applications, the quantification and speciation of emission sources from oil and gas facilities were reevaluated to determine the {open_quotes}potential-to-emit.{close_quotes} The existing emissions were primarily based on EPA emission factors such as AP-42, for tanks, combustion sources, and fugitive emissions from component leaks. Emissions from insignificant activities and routine operations that are associated with maintenance, startups and shutdowns, and releases to control devices also required quantification. To reconcile EPA emission factors with test data, process knowledge, and manufacturer`s data, a careful review of other estimation options was performed. This paper represents the results of this analysis of emission sources at oil and gas facilities, including exploration and production, compressor stations and gas plants.

Thompson, C.C. [C-K Associates, Inc., Baton Rouge, LA (United States); Killian, T.L. [Conoco, Inc., Houston, TX (United States)

1996-12-31T23:59:59.000Z

71

Determining inert content in coal dust/rock dust mixture  

DOE Patents [OSTI]

A method and apparatus for determining the inert content of a coal dust and rock dust mixture uses a transparent window pressed against the mixture. An infrared light beam is directed through the window such that a portion of the infrared light beam is reflected from the mixture. The concentration of the reflected light is detected and a signal indicative of the reflected light is generated. A normalized value for the generated signal is determined according to the relationship .phi.=(log i.sub.c `log i.sub.co) / (log i.sub.c100 -log i.sub.co) where i.sub.co =measured signal at 0% rock dust i.sub.c100 =measured signal at 100% rock dust i.sub.c =measured signal of the mixture. This normalized value is then correlated to a predetermined relationship of .phi. to rock dust percentage to determine the rock dust content of the mixture. The rock dust content is displayed where the percentage is between 30 and 100%, and an indication of out-of-range is displayed where the rock dust percent is less than 30%. Preferably, the rock dust percentage (RD%) is calculated from the predetermined relationship RD%=100+30 log .phi.. where the dust mixture initially includes moisture, the dust mixture is dried before measuring by use of 8 to 12 mesh molecular-sieves which are shaken with the dust mixture and subsequently screened from the dust mixture.

Sapko, Michael J. (Finleyville, PA); Ward, Jr., Jack A. (Oakmont, PA)

1989-01-01T23:59:59.000Z

72

Hunting a climate fugitive  

Science Journals Connector (OSTI)

...And as hydraulic fracturing (fracking) methods have helped flood energy markets with relatively cheap natural gas, it has begun...kilometers of pipe. To confirm that suspicion, researchers at Colorado State University are now working with seven gas firms to use...

Eli Kintisch

2014-06-27T23:59:59.000Z

73

LOOKING THROUGH THE HIPPO: NUCLEUS AND DUST IN COMET 2P/ENCKE David Jewitt  

E-Print Network [OSTI]

´ndez et al. 2000). Compared with recent, bright long-period com- ets such as C/Hale-Bopp and C (see also Gehrz & Ney 1992), meaning that the comet is gas-rich and dust-poor. The latter conclusion cannot liter- ally be true, however, since strong, long-wavelength thermal emission indicates a dust/gas

Jewitt, David C.

74

DUST-PLASMA INTERACTIONS  

SciTech Connect (OSTI)

The objective of our theoretical research under this grant over the past 3 years was to develop new understanding in a range of topics in the physics of dust-plasma interactions, with application to space and the laboratory. We conducted studies related to the physical properties of dust, waves and instabilities in both weakly coupled and strongly coupled dusty plasmas, and innovative possible applications. A major consideration in our choice of topics was to compare theory with experiments or observations, and to motivate new experiments, which we believe is important for developing this relatively new field. Our research is summarized, with reference to our list of journal publications.

Dr. M. Rosenberg

2010-01-05T23:59:59.000Z

75

Moon Dust and Coal Ash  

Science Journals Connector (OSTI)

... SIR,-The similarity of the description of moon dust particles and that of pulverized coal ...coalash ...

D. J. THORNE; J. D. WATT

1969-09-27T23:59:59.000Z

76

Viable Algae in House Dust  

Science Journals Connector (OSTI)

... two culture media: Bristol8 and modified Chu No. 10 (ref. 9). Viable algae were cultured from all the dust samples taken from forty -one homes. In these ... 1). Samples from three commercial producers of house dust allergenic extract also revealed viable algae (Table 2). In general, the algal organisms found in house dust used in ...

I. LEONARD BERNSTEIN; ROBERT S. SAFFERMAN

1970-08-22T23:59:59.000Z

77

E-Print Network 3.0 - anomalous silicate dust Sample Search Results  

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

391, L49L53 (2008) doi:10.1111j.1745-3933.2008.00553.x On the anomalous silicate emission features of active galactic nuclei Summary: the porous dust model with the...

78

Rapid formation of large dust grains in the luminous supernova SN 2010jl  

E-Print Network [OSTI]

The origin of dust in galaxies is still a mystery. The majority of the refractory elements are produced in supernova explosions but it is unclear how and where dust grains condense and grow, and how they avoid destruction in the harsh environments of star-forming galaxies. The recent detection of 0.1-0.5 solar masses of dust in nearby supernova remnants suggests in situ dust formation, while other observations reveal very little dust in supernovae the first few years after explosion. Observations of the bright SN 2010jl have been interpreted as pre-existing dust, dust formation or no dust at all. Here we report the rapid (40-240 days) formation of dust in its dense circumstellar medium. The wavelength dependent extinction of this dust reveals the presence of very large (> 1 micron) grains, which are resistant to destructive processes. At later times (500-900 days), the near-IR thermal emission shows an accelerated growth in dust mass, marking the transition of the supernova from a circumstellar- to an ejecta-...

Gall, Christa; Watson, Darach; Dwek, Eli; Maund, Justyn R; Fox, Ori; Leloudas, Giorgos; Malesani, Daniele; Day-Jones, Avril C

2014-01-01T23:59:59.000Z

79

Inside dust devils  

Science Journals Connector (OSTI)

......is added by random atmospheric surface eddies in the...surface. Wind speed Atmospheric vortices such as tornadoes, dust devils and water spouts are often recognized...internal wind speeds of atmospheric vortices and this is...test using a vortex generator Lunar and Planetary......

T J Ringrose

2005-10-01T23:59:59.000Z

80

Large Aperture Electrostatic Dust Detector  

SciTech Connect (OSTI)

Diagnosis and management of dust inventories generated in next-step magnetic fusion devices is necessary for their safe operation. A novel electrostatic dust detector, based on a fine grid of interlocking circuit traces biased to 30 or 50 ? has been developed for the detection of dust particles on remote surfaces in air and vacuum environments. Impinging dust particles create a temporary short circuit and the resulting current pulse is recorded by counting electronics. Up to 90% of the particles are ejected from the grid or vaporized suggesting the device may be useful for controlling dust inventories. We report measurements of the sensitivity of a large area (5x5 cm) detector to microgram quantities of dust particles and review its applications to contemporary tokamaks and ITER.

C.H. Skinner, R. Hensley, and A.L Roquemore

2007-10-09T23:59:59.000Z

Note: This page contains sample records for the topic "fugitive dust emissions" 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

Uncertainty in Modeling Dust Mass Balance and Radiative Forcing from Size Parameterization  

SciTech Connect (OSTI)

This study examines the uncertainties in simulating mass balance and radiative forcing of mineral dust due to biases in the aerosol size parameterization. Simulations are conducted quasi-globally (180oW-180oE and 60oS-70oN) using the WRF24 Chem model with three different approaches to represent aerosol size distribution (8-bin, 4-bin, and 3-mode). The biases in the 3-mode or 4-bin approaches against a relatively more accurate 8-bin approach in simulating dust mass balance and radiative forcing are identified. Compared to the 8-bin approach, the 4-bin approach simulates similar but coarser size distributions of dust particles in the atmosphere, while the 3-mode pproach retains more fine dust particles but fewer coarse dust particles due to its prescribed og of each mode. Although the 3-mode approach yields up to 10 days longer dust mass lifetime over the remote oceanic regions than the 8-bin approach, the three size approaches produce similar dust mass lifetime (3.2 days to 3.5 days) on quasi-global average, reflecting that the global dust mass lifetime is mainly determined by the dust mass lifetime near the dust source regions. With the same global dust emission (~6000 Tg yr-1), the 8-bin approach produces a dust mass loading of 39 Tg, while the 4-bin and 3-mode approaches produce 3% (40.2 Tg) and 25% (49.1 Tg) higher dust mass loading, respectively. The difference in dust mass loading between the 8-bin approach and the 4-bin or 3-mode approaches has large spatial variations, with generally smaller relative difference (<10%) near the surface over the dust source regions. The three size approaches also result in significantly different dry and wet deposition fluxes and number concentrations of dust. The difference in dust aerosol optical depth (AOD) (a factor of 3) among the three size approaches is much larger than their difference (25%) in dust mass loading. Compared to the 8-bin approach, the 4-bin approach yields stronger dust absorptivity, while the 3-mode approach yields weaker dust absorptivity. Overall, on quasi-global average, the three size parameterizations result in a significant difference of a factor of 2~3 in dust surface cooling (-1.02~-2.87 W m-2) and atmospheric warming (0.39~0.96 W m-2) and in a tremendous difference of a factor of ~10 in dust TOA cooling (-0.24~-2.20 W m-2). An uncertainty of a factor of 2 is quantified in dust emission estimation due to the different size parameterizations. This study also highlights the uncertainties in modeling dust mass and number loading, deposition fluxes, and radiative forcing resulting from different size parameterizations, and motivates further investigation of the impact of size parameterizations on modeling dust impacts on air quality, climate, and ecosystem.

Zhao, Chun; Chen, Siyu; Leung, Lai-Yung R.; Qian, Yun; Kok, Jasper; Zaveri, Rahul A.; Huang, J.

2013-11-05T23:59:59.000Z

82

Characterization of secondary grain dust explosions  

E-Print Network [OSTI]

dust less than 106 um . . . ~ . . ~ ~ ~ ~ 27 4 Coulter Counter particle size distribution for wheat dust less than 106 um . 28 5 Coulter Counter particle size distribution for rice dust less than 106 um ~ 29 6 Coulter Counter particle size... distribution f' or wheat/sorghum dust, less than 106 um . 7 Coulter Counter particle size distribution for soybean dust less than 106 um 31 8 Coulter Counter particle size distribution for corn dust between 106 and. 250 um 9 Coulter Counter particle size...

Schulman, Cheryl Wendler

2012-06-07T23:59:59.000Z

83

Dust time in quantum cosmology  

E-Print Network [OSTI]

We give a formulation of quantum cosmology with a pressureless dust and arbitrary additional matter fields. The dust provides a natural time gauge corresponding to a cosmic time, yielding a physical time independent Hamiltonian. The approach simplifies the analysis of both Wheeler-deWitt and loop quantum cosmology models, broadening the applicability of the latter.

Husain, Viqar

2013-01-01T23:59:59.000Z

84

Dust and Gas Debris Around Main Sequence Stars  

E-Print Network [OSTI]

Debris disks are dusty, gas-poor disks around main sequence stars (Backman & Paresce 1993; Lagrange, Backman & Artymowicz 2000; Zuckerman 2001). Micron-sized dust grains are inferred to exist in these systems from measurements of their thermal emission at infrared through millimeter wavelengths. The estimated lifetimes for circumstellar dust grains due to sublimation, radiation and corpuscular stellar wind effects are typically significantly smaller than the estimated ages for the stellar systems, suggesting that the grains are replenished from a reservoir, such as sublimation of comets or collisions between parent bodies. Since the color temperature for the excess emission is typically Tgr ~ 110 - 120 K, similar to that expected for small grains in the Kuiper Belt, these objects are believe to be generated by collisions between parent bodies analogous to Kuiper Belt objects in our solar system; however, a handful of systems possess warm dust, with Tgr > 300 K, at temperatures similar to the terrestrial planets. We describe the physical characteristics of debris disks, the processes that remove dust from disks, and the evidence for the presence of planets in debris disks. We also summarize observations of infalling comets toward beta Pictoris and measurements of bulk gas in debris disks.

Christine H. Chen

2005-11-22T23:59:59.000Z

85

On vapor shielding of dust grains of iron, molybdenum, and tungsten in fusion plasmas  

SciTech Connect (OSTI)

The shielding effects of ablation cloud around a small dust grain composed of iron, molybdenum, or tungsten in fusion plasmas are considered. These include collisional dissipation of momentum flux of impinging plasma ions, heat transfer by secondary plasma created due to electron impact ionization of the ablated atoms, and radiative plasma power losses in the ablation cloud. The maximum radius, which limits applicability of existing dust-plasma interaction models neglecting the cloud shielding effects, for dust grains of the considered high-Z metals is calculated as function of plasma parameters. The thermal bifurcation triggered by thermionic electron emission from dust grains, observed for some of the considered materials, is analyzed. The results are compared with previous calculations for dust composed of low-Z fusion related materials, i.e., lithium, beryllium, and carbon.

Brown, B. T.; Smirnov, R. D., E-mail: rsmirnov@ucsd.edu; Krasheninnikov, S. I. [Department of Mechanical and Aerospace Engineering, University of California, San Diego, 9500 Gilman Dr., La Jolla, California 92093-0411 (United States)] [Department of Mechanical and Aerospace Engineering, University of California, San Diego, 9500 Gilman Dr., La Jolla, California 92093-0411 (United States)

2014-02-15T23:59:59.000Z

86

Eight-year Climatology of Dust Optical Depth on Mars  

E-Print Network [OSTI]

We have produced a multiannual climatology of airborne dust from Martian year 24 to 31 using multiple datasets of retrieved or estimated column optical depths. The datasets are based on observations of the Martian atmosphere from April 1999 to July 2013 made by different orbiting instruments: the Thermal Emission Spectrometer (TES) aboard Mars Global Surveyor, the Thermal Emission Imaging System (THEMIS) aboard Mars Odyssey, and the Mars Climate Sounder (MCS) aboard Mars Reconnaissance Orbiter (MRO). The procedure we have adopted consists of gridding the available retrievals of column dust optical depth (CDOD) from TES and THEMIS nadir observations, as well as the estimates of this quantity from MCS limb observations. Our gridding method calculates averages and uncertainties on a regularly spaced, but possibly incomplete, spatio-temporal grid, using an iterative procedure weighted in space, time, and retrieval uncertainty. In order to evaluate strengths and weaknesses of the resulting gridded maps, we validat...

Montabone, L; Millour, E; Wilson, R J; Lewis, S R; Cantor, B A; Kass, D; Kleinboehl, A; Lemmon, M; Smith, M D; Wolff, M J

2014-01-01T23:59:59.000Z

87

PROPERTIES OF NEWLY FORMED DUST GRAINS IN THE LUMINOUS TYPE IIn SUPERNOVA 2010jl  

SciTech Connect (OSTI)

Supernovae (SNe) have been proposed to be the main production sites of dust grains in the universe. However, our knowledge of their importance to dust production is limited by observationally poor constraints on the nature and amount of dust particles produced by individual SNe. In this paper, we present a spectrum covering optical through near-Infrared (NIR) light of the luminous Type IIn supernova 2010jl around one and a half years after the explosion. This unique data set reveals multiple signatures of newly formed dust particles. The NIR portion of the spectrum provides a rare example where thermal emission from newly formed hot dust grains is clearly detected. We determine the main population of the dust species to be carbon grains at a temperature of ?1350-1450 K at this epoch. The mass of the dust grains is derived to be ?(7.5-8.5) × 10{sup –4} M{sub ?}. Hydrogen emission lines show wavelength-dependent absorption, which provides a good estimate of the typical size of the newly formed dust grains (?< 0.1 ?m, and most likely ?< 0.01 ?m). We believe the dust grains were formed in a dense cooling shell as a result of a strong SN-circumstellar media (CSM) interaction. The dust grains occupy ?10% of the emitting volume, suggesting an inhomogeneous, clumpy structure. The average CSM density must be ?> 3 × 10{sup 7} cm{sup –3}, corresponding to a mass loss rate of ?> 0.02 M{sub ?} yr{sup –1} (for a mass loss wind velocity of ?100 km s{sup –1}). This strongly supports a scenario in which SN 2010jl and probably other luminous SNe IIn are powered by strong interactions within very dense CSM, perhaps created by Luminous-Blue-Variable-like eruptions within the last century before the explosion.

Maeda, K.; Nozawa, T.; Folatelli, G.; Moriya, T. J.; Nomoto, K.; Bersten, M.; Quimby, R. [Kavli Institute for the Physics and Mathematics of the Universe (WPI), Todai Institutes for Advanced Study, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583 (Japan); Sahu, D. K.; Anupama, G. C. [Indian Institute of Astrophysics, Koramangala, Bangalore 560 034 (India); Minowa, Y.; Pyo, T.-S. [Subaru Telescope, National Astronomical Observatory of Japan, 650 North A'ohoku Place, Hilo, HI 96720 (United States); Motohara, K.; Kitagawa, Y. [Institute of Astronomy, University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015 (Japan); Ueno, I.; Kawabata, K. S.; Yamanaka, M. [Hiroshima Astrophysical Science Center, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526 (Japan); Kozasa, T. [Department of Cosmosciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810 (Japan); Iye, M., E-mail: keiichi.maeda@ipmu.jp [National Astronomical Observatory, Mitaka, Tokyo (Japan)

2013-10-10T23:59:59.000Z

88

Technology Reinvestment Program/Advanced ``Zero Emission'' Control Valve (Phase II)  

SciTech Connect (OSTI)

The objectives of this effort are to determine, develop and demonstrate the feasibility of significantly reducing the cost and expanding the applications for a family of Advanced Zero Emissions Control Valves that meets the fugitive emissions requirements of the 1990 Amendments to the Clean Air Act. This program is a direct technology spin-off from the valve technology that is critical to the US Navy's Nuclear Powered Fleet. These zero emissions valves will allow the Hydrocarbon and Chemical Processing Industries, etc., to maintain their competitiveness and still meet environmental and safety requirements. Phase 2 is directed at refining the basic technologies developed during Phase 1 so that they can be more readily selected and utilized by the target market. In addition to various necessary certifications, the project will develop a full featured digital controller with ``smart valve'' growth capability, expanding valve sizes/applications and identifying valve materials to permit applications in severe operational environments.

J. Napoleon

1998-12-01T23:59:59.000Z

89

Moon Dust and Coal Ash  

Science Journals Connector (OSTI)

... struck by the similarity between the preliminary descriptions of moon dust and that of the ash residue collected from pulverized ... residue collected from pulverized coal-fired boilers (that is, pulverized fuel ...

A. B. HART; E. RAASK

1969-08-16T23:59:59.000Z

90

On the Absorption and Emission Properties of Interstellar Grains  

E-Print Network [OSTI]

Our current understanding of the absorption and emission properties of interstellar grains are reviewed. The constraints placed by the Kramers-Kronig relation on the wavelength-dependence and the maximum allowable quantity of the dust absorption are discussed. Comparisons of the opacities (mass absorption coefficients) derived from interstellar dust models with those directly estimated from observations are presented.

Aigen Li

2005-03-25T23:59:59.000Z

91

Mineral Dust Entrainment and Deposition (DEAD) model: Description and 1990s dust climatology  

E-Print Network [OSTI]

DUST MODEL AND 1990S CLIMATOLOGY Table 5. Trace MetalDUST MODEL AND 1990S CLIMATOLOGY Figure 7. Predicted andDUST MODEL AND 1990S CLIMATOLOGY Mahowald, N. , K. Kohfeld,

Zender, Charles S; Bian, H.; Newman, D.

2003-01-01T23:59:59.000Z

92

A search for evolved dust in Herbig Ae stars  

E-Print Network [OSTI]

We present observations of six isolated, pre-main-sequence, intermediate mass stars selected for shallow spectra at submillimeter wavelengths at 1.3, 2.6, 7.0, and 36 millimeters from the IRAM PdBI and the VLA. We analyze the new observations of these stars (HD34282, HD35187, HD142666, HD143006, HD150193, HD163296) together with similar observations of three additional stars from the literature (CQ Tau, UX Ori, TW Hya), in the context of self-consistent irradiated disk models. Our aim is to constrain the wavelength dependence of the dust opacity and the total dust mass in the disks. The shallow wavelength dependence of the opacity is confirmed and for a few stars extended to significantly longer wavelengths. For any plausible dust properties, this requires grain growth from interstellar sizes to maximum sizes of at least a few millimeters, and very likely to several centimeters or more. For four of the stars (HD34282, HD163296, CQ Tau, TW Hya), the millimeter emission has been spatially resolved, and the large disk radii ($>100$ AU) rule out that high optical depths play a role. The mass of dust that has been processed into large grains is substantial, and in some cases implies a disk mass comparable to the mass of the central star.

A. Natta; L. Testi; R. Neri; D. S. Shepherd; D. J. Wilner

2003-11-28T23:59:59.000Z

93

Glass Frit Clumping And Dusting  

SciTech Connect (OSTI)

DWPF mixes a slurry of glass frit (Frit 418) and dilute (1.5 wt%) formic acid solution with high level waste in the Slurry Mix Evaporator (SME). There would be advantages to introducing the frit in a non-slurry form to minimize water addition to the SME, however, adding completely dry frit has the potential to generate dust which could clog filters or condensers. Prior testing with another type of frit, Frit 320, and using a minimal amount of water reduced dust generation, however, the formation of hard clumps was observed. To examine options and behavior, a TTQAP [McCabe and Stone, 2013] was written to initiate tests that would address these concerns. Tests were conducted with four types of glass frit; Frit 320, DWPF Frit 418, Bekeson Frit 418 and Multi-Aspirator Frit 418. The last two frits are chemically identical to DWPF Frit 418 but smaller particles were removed by the respective vendors. Test results on Frit Clumping and Dusting are provided in this report. This report addresses the following seven questions. Short answers are provided below with more detailed answers to follow. 1. Will the addition of a small amount of water, 1.5 wt%, to dry DWPF Frit 418 greatly reduce the dust generation during handling at DWPF? a. Yes, a small scale test showed that adding a little water to the frit greatly reduced dust generation during handling. 2. Will the addition of small amounts of water to the frit cause clumping that will impair frit handling at DWPF? a. No, not with Frit 418. Although clumps were observed to form when 1.5 wt% water was mixed with DWPF Frit 418, then compressed and air-dried overnight, the clumps were easily crushed and did not form the hardened material noted when Frit 320 was tested. 3. What is the measured size distribution of dust generated when dry frit is handled? (This affects the feasibility and choice of processing equipment for removing the dust generating fraction of the frit before it is added to the SME.) a. The size distribution for the dust removed from fresh DWPF Frit 418 while it was being shaken in a small scale LabRAM test was measured. The median size on a volume basis was 7.6 ?m and 90% of the frit particles were between 1.6 and 28 ?m. The mass of dust collected using this test protocol was much less than 1% of the original frit. 4. Can the dust be removed in a small number of processing steps and without the larger frit particles continuing to spall additional dust sized particles? a. Test results using a LabRAM were inconclusive. The LaRAM performs less efficient particle size separation than the equipment used by Bekeson and Multi-Aspirator. 5. What particle size of frit is expected to create a dust problem? a. The original criterion for creating a dusting problem was those particle sizes that were readily suspended when being shaken. For that criterion calculations and Microtrac size analyses indicated that particles smaller than 37 ?m are likely dust generators. Subsequently a more sophisticated criterion for dust problem was considered, particle sizes that would become suspended in the air flow patterns inside the SME and possibly plug the condenser. That size may be larger than 37 ?m but has not yet been determined. 6. If particles smaller than 37 ?m are removed will bulk dust generation be eliminated? a. Video-taped tests were performed using three gallons each of three types of frit 418, DWPF frit, Bekeson frit and Multi-Aspirator frit. Frit was poured through air from a height of approximately eight feet into a container half filled with water. Pouring Bekeson frit or Multi-Aspirator frit generated markedly less visible dust, but there was still a significant amount, which still has the potential of causing a dust problem. 7. Can completely dry frit be poured into the SME without having dust plug the condenser at the top of the vessel? a. Because of the complexity of air currents inside the SME and the difficulty of defensible size scaling a more prototypical test will be required to answer this question. We recommend construction of a full scale

Steimke, J. L.

2013-09-26T23:59:59.000Z

94

Coal cutting research slashes dust  

SciTech Connect (OSTI)

US Bureau of Mines' research projects aimed at the reduction of coal dust during coal cutting operations are described. These include an investigation of the effects of conical bit wear on respirable dust generation, energy and cutting forces; the determination of the best conical bit mount condition to increase life by enhancing bit rotation; a comparison between chisel- and conical-type cutters. In order to establish a suitable homogeneous reference material for cutting experiments, a synthetic coal with a plaster base is being developed.

Roepke, W.W.

1983-10-01T23:59:59.000Z

95

Electrostatic Dust Detector with Improved Sensitivity  

SciTech Connect (OSTI)

Methods to measure the inventory of dust particles and to remove dust if it approaches safety limits will be required in next-step tokamaks such as ITER. An electrostatic dust detector, based on a fine grid of interlocking circuit traces, biased to 30 or 50 V, has been developed for the detection of dust on remote surfaces in air and vacuum environments. Gaining operational experience of dust detection on surfaces in tokamaks is important, however the level of dust generated in contemporary short-pulse tokamaks is comparatively low and high sensitivity is necessary to measure dust on a shot-by-shot basis. We report on modifications in the detection electronics that have increased the sensitivity of the electrostatic dust detector by a factor of up to 120, - a level suitable for measurements on contemporary tokamaks.

D.P. Boyle, C.H. Skinner, and A. L. Roquemore

2008-06-09T23:59:59.000Z

96

Using Reconstructed Dust Climatology to Study the Impacts of Martian Dust Storms on Dynamics  

E-Print Network [OSTI]

Using Reconstructed Dust Climatology to Study the Impacts of Martian Dust Storms on Dynamics L@atm.ox.ac.uk) Abstract We have reconstructed the climatology of the dust on Mars using available retrievals and estimates) a reconstruction of the dust optical depth climatology based on weighted gridding for Martian years 24

Cambridge, University of

97

EFFECT OF COAL DUST ONEFFECT OF COAL DUST ON RAILROAD BALLAST STRENGTHRAILROAD BALLAST STRENGTH  

E-Print Network [OSTI]

1 EFFECT OF COAL DUST ONEFFECT OF COAL DUST ON RAILROAD BALLAST STRENGTHRAILROAD BALLAST STRENGTH for Laboratory StudyFouling Mechanism / Need for Laboratory Study Mechanical Properties of Coal DustMechanical Properties of Coal Dust Grain Size AnalysisGrain Size Analysis AtterbergAtterberg LimitsLimits Specific

Barkan, Christopher P.L.

98

Adding coal dust to coal batch  

SciTech Connect (OSTI)

The granulometric composition of coke dust from the dry-slaking machine is determined. The influence of additions of 3-7% coke dust on the quality of industrial coking batch and the coke obtained by box coking is estimated. Adding 1% coke dust to coking batch does not markedly change the coke quality. Industrial equipment for the supply of dry-slaking dust to the batch is described.

V.S. Shved; A.V.Berezin [OAO Koks, Kemerovo (Russian Federation)

2009-05-15T23:59:59.000Z

99

Dust Studies in DIII-D Tokamak  

SciTech Connect (OSTI)

Studies of submicron dust using Mie scattering from Nd:YAG lasers and video data of micron to sub-millimeter sized dust on DIII-D tokamak have provided the first data of dust sources and transport during tokamak discharges. During normal operation on DIII-D dust observation rates are low, a few events per discharge or less. The net carbon content of the dust corresponds to a carbon atom density a few orders of magnitude below the core impurity density. Statistical analysis of Mie data collected over months of operation reveal correlation of increased dust rate with increased heating power and impulsive wall loading due to edge localized modes (ELMs) and disruptions. Generation of significant amounts of dust by disruptions is confirmed by the camera data. However, dust production by disruptions alone is insufficient to account for estimated in-vessel dust inventory in DIII-D. After an extended entry vent, thousands of dust particles are observed by cameras in the first 2-3 plasma discharges. Individual particles moving at velocities up to {approx}300 m/s, breakup of larger particles into pieces, and collisions of particles with walls are observed. After {approx}70 discharges, dust levels are reduced to a few events per discharge. In order to calibrate diagnostics and benchmark modeling, milligram amounts of micron-sized carbon dust have been injected into DIII-D discharges, leading to the core carbon density increase by a factor of 2-3. Following injection, dust trajectories in the divertor are mostly in the toroidal direction, consistent with the ion drag force. Dust from the injection is observed in the outboard midplane by a fast framing camera. The observed trajectories and velocities of the dust particles are in qualitative agreement with modeling by the 3D DustT code.

Rudakov, D L; West, W P; Groth, M; Yu, J H; Boedo, J A; Bray, B D; Brooks, N H; Fenstermacher, M E; Hollmann, E M; Hyatt, A W; Krasheninnikov, S I; Lasnier, C J; Moyer, R A; Pigarov, A Y; Smirnov, R; Solomon, W M; Wong, C C

2008-04-15T23:59:59.000Z

100

Characterization of jovian plasma embedded dust particles  

E-Print Network [OSTI]

As the data from space missions and laboratories improve, a research domain combining plasmas and charged dust is gaining in prominence. Our solar system provides many natural laboratories such as planetary rings, comet comae and tails, ejecta clouds around moons and asteroids, and Earth's noctilucent clouds for which to closely study plasma-embedded cosmic dust. One natural laboratory to study electromagnetically-controlled cosmic dust has been provided by the Jovian dust streams and the data from the instruments which were on board the Galileo spacecraft. Given the prodigious quantity of dust poured into the Jovian magnetosphere by Io and its volcanoes resulting in the dust streams, the possibility of dusty plasma conditions exist. This paper characterizes the main parameters for those interested in studying dust embedded in a plasma with a focus on the Jupiter environment. I show how to distinguish between dust-in-plasma and dusty-plasma and how the Havnes parameter P can be used to support or negate the possibility of collective behavior of the dusty plasma. The result of applying these tools to the Jovian dust streams reveals mostly dust-in-plasma behavior. In the orbits displaying the highest dust stream fluxes, portions of orbits E4, G7, G8, C21 satisfy the minimum requirements for a dusty plasma. However, the P parameter demonstrates that these mild dusty plasma conditions do not lead to collective behavior of the dust stream particles.

Amara L. Graps

2006-05-21T23:59:59.000Z

Note: This page contains sample records for the topic "fugitive dust emissions" 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

Assessing sources of airborne mineral dust and other aerosols, in Iraq  

Science Journals Connector (OSTI)

Most airborne particulate matter in Iraq comes from mineral dust sources. This paper describes the statistics and modeling of chemical results, specifically those from Teflon® filter samples collected at Tikrit, Balad, Taji, Baghdad, Tallil and Al Asad, in Iraq, in 2006/2007. Methodologies applied to the analytical results include calculation of correlation coefficients, Principal Components Analysis (PCA), and Positive Matrix Factorization (PMF) modeling. PCA provided a measure of the covariance within the data set, thereby identifying likely point sources and events. These include airborne mineral dusts of silicate and carbonate minerals, gypsum and salts, as well as anthropogenic sources of metallic fumes, possibly from battery smelting operations, and emissions of leaded gasoline vehicles. Five individual PMF factors (source categories) were modeled, four of which being assigned to components of geological dust, and the fifth to gasoline vehicle emissions together with battery smelting operations. The four modeled geological components, dust-siliceous, dust-calcic, dust-gypsum, and evaporate occur in variable ratios for each site and size fraction (TSP, PM10, and PM2.5), and also vary by season. In general, Tikrit and Taji have the largest and Al Asad the smallest percentages of siliceous dust. In contrast, Al Asad has the largest proportion of gypsum, in part representing the gypsiferous soils in that region. Baghdad has the highest proportions of evaporite in both size fractions, ascribed to the highly salinized agricultural soils, following millennia of irrigation along the Tigris River valley. Although dust storms along the Tigris and Euphrates River valleys originate from distal sources, the mineralogy bears signatures of local soils and air pollutants.

Johann P. Engelbrecht; R.K.M. Jayanty

2013-01-01T23:59:59.000Z

102

Atmospheric controls on the annual cycle of North African dust Sebastian Engelstaedter1  

E-Print Network [OSTI]

and central Chad. Dust emissions from these sources follow a distinct seasonal cycle. Whereas our., 2000; Andreae et al., 2005; Kaufman et al., 2002] by scattering and absorbing incoming solar radiation the American coast [Shinn et al., 2000; Walsh and Steidinger, 2001] and in Puerto Rico [Stallard, 2001], may

Washington, Richard

103

THE SCATTERED X-RAY HALO AROUND NOVA CYGNI 1992: TESTING A MODEL FOR INTERSTELLAR DUST  

E-Print Network [OSTI]

and Jonathan C. Tan Princeton University Observatory, Peyton Hall, Princeton, NJ 08544; draine@astro.princeton.edu, jt@astro.princeton.edu Received 2002 August 15; accepted 2003 May 13 ABSTRACT We use published ROSAT of emission from an O-Ne white dwarf plus a thermal plasma, and X-ray scattering is calculated for a dust

Draine, Bruce T.

104

A novel aspect of dust in plasma  

SciTech Connect (OSTI)

Nonlinear screening of the dust grains immersed in a homogenous fully ionized electron-ion plasma is investigated. Assuming conservation of entropy, an important relation is obtained between the maximum potential (and therefore the charge) of the dust grain and the temperature of the electrons. The Thomas-Fermi equation is derived for the potential of a dust grain in a nondegenerate plasma suggesting the existence of dust atom with a well defined atomic radius. Furthermore, based on the Born-Oppenheimer approximation, the notion of a dust-grain molecule is introduced in which the protons act like a kind of 'glue' which binds two negatively charged dust grains together, and the motion of the grains have little influence on that binding force. Finally, considering the weak interaction between the proton clouds of two dust grains, an expression of exchange energy is obtained.

Tsintsadze, N.L.; Murtaza, G.; Ehsan, Z. [Department of Plasma Physics, Tbilisi State University (Georgia); National Centre for Mathematics and Salam Chair in Physics, G.C. University Lahore, 54000 (Pakistan); National Centre for Mathematics and Salam Chair in Physics, G.C. University Lahore, 54000 (Pakistan)

2006-02-15T23:59:59.000Z

105

Coal cutting research slashes dust  

SciTech Connect (OSTI)

The Coal-Cutting Technology Group at the Bureau of Mine's Twin Cities Research Center is investigating ways to reduce primary dust generated by coal cutting. The progression of research within the program is from fundamental laboratory research, to fundamental field research, to field concept verification. Then the Bureau recommends warranted changes and/or prototype development to industry. Currently the Cutting Technology Group has several projects in each phase of research. The Bureau's current fundamental studies of bit characteristics are directed to determining the effects of conical bit wear on primary respirable dust generation, energy, and cutting forces; establishing best conical bit mount condition to increase life by enhancing bit rotation; and comparing chisel-type cutters to conical-type cutters. Additionally, to establish a suitable homogeneous reference material for cutting experiments, a synthetic coal with a plaster base is being developed.

Roepke, W.W.

1983-10-01T23:59:59.000Z

106

Coal cutting research slashes dust  

SciTech Connect (OSTI)

The Coal-Cutting Technology Group at the Bureau of Mines Twin Cities (MN) Research Center is investigating ways to reduce primary dust generated by coal cutting. The progression of research within the program is from fundamental laboratory research, to fundamental field research, to field concept verification. Then the Bureau recommends warranted changes and/or prototype development to industry. Currently the group has several projects in each phase of research. The Bureau's current fundamental studies of bit characteristics are directed toward determining the effects of conical bit wear on primary respirable dust generation, energy, and cutting forces; establishing best conical bit mount condition to increase life by enhancing bit rotation; and comparing chisel-type cutters to conical-type cutters. Additionally, to establish a suitable homogeneous reference material for cutting experiments, a synthetic coal with a plaster base is being developed.

Roepke, W.W.

1983-10-01T23:59:59.000Z

107

Collisionless damping of nonlinear dust ion acoustic wave due to dust charge fluctuation  

Science Journals Connector (OSTI)

A dissipation mechanism for the damping of the nonlinear dust ion acoustic wave in a collisionless dusty plasma consisting of nonthermal electrons, ions, and variable charge dust grains has been investigated. It is shown that the collisionless damping due to dust charge fluctuation causes the nonlinear dust ion acoustic wave propagation to be described by the damped Korteweg-de Vries equation. Due to the presence of nonthermal electrons, the dust ion acoustic wave admits both positive and negative potential and it suffers less damping than the dust acoustic wave, which admits only negative potential.

Samiran Ghosh; Tushar K. Chaudhuri; Susmita Sarkar; Manoranjan Khan; M. R. Gupta

2002-03-21T23:59:59.000Z

108

THE ABSENCE OF COLD DUST AROUND WARM DEBRIS DISK STAR HD 15407A  

SciTech Connect (OSTI)

We report Herschel and AKARI photometric observations at far-infrared (FIR) wavelengths of the debris disk around the F3V star HD 15407A, in which the presence of an extremely large amount of warm dust ({approx}500-600 K) has been suggested by mid-infrared (MIR) photometry and spectroscopy. The observed flux densities of the debris disk at 60-160 {mu}m are clearly above the photospheric level of the star, suggesting excess emission at FIR as well as at MIR wavelengths previously reported. The observed FIR excess emission is consistent with the continuum level extrapolated from the MIR excess, suggesting that it originates in the inner warm debris dust and cold dust ({approx}50-130 K) is absent in the outer region of the disk. The absence of cold dust does not support a late-heavy-bombardment-like event as the origin of the large amount of warm debris dust around HD 15047A.

Fujiwara, Hideaki [Subaru Telescope, National Astronomical Observatory of Japan, 650 North A'ohoku Pl., Hilo, HI 96720 (United States); Onaka, Takashi [Department of Astronomy, School of Science, University of Tokyo, Bunkyo-ku, Tokyo 113-0033 (Japan); Takita, Satoshi; Kataza, Hirokazu; Murakami, Hiroshi [Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210 (Japan); Yamashita, Takuya [National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-0015 (Japan); Fukagawa, Misato [Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043 (Japan); Ishihara, Daisuke, E-mail: hideaki@naoj.org [Department of Physics, School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602 (Japan)

2012-11-01T23:59:59.000Z

109

Polyfluoroalkyl chemicals in house dust  

SciTech Connect (OSTI)

We developed a high throughput analytical method using on-line solid phase extraction coupled with isotope dilution high-performance liquid chromatography-tandem mass spectrometry (on-line SPE-HPLC-MS/MS) to simultaneously determine the concentrations of 17 polyfluoroalkyl chemicals (PFCs) in house dust. The sample preparation includes dispersion of the dust samples in 0.1 M formic acid:MeOH (1:1), followed by agitation and filtration, addition of the isotope-labeled internal standard solution to the filtrate, and analysis by on-line SPE-HPLC-MS/MS. The limits of quantitation were <4.0 ng/g. The method accuracies ranged between 73.2% and 100.2% for the different analytes at two spike levels. We confirmed the validity of the method by analyzing 39 household dust samples collected in 2004. Of the 17 PFCs measured, 6 of them-perfluorobutane sulfonate (PFBuS), N-ethyl-perfluorooctane sulfonamide, 2-(N-ethyl-perfluorooctane sulfonamido) acetic acid (Et-PFOSA-AcOH), 2-(N-methyl-perfluorooctane sulfonamido) ethanol (Me-PFOSA-EtOH), perfluorohexane sulfonate (PFHxS), and perfluorooctane sulfonate (PFOS)-had detection frequencies >70%. We detected PFOS, PFBuS, and PFHxS at the highest median concentration, followed by Et-PFOSA-AcOH and Me-PFOSA-EtOH.

Kato, Kayoko [Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, 4770 Buford Hwy., Mailstop F53, Atlanta, GA 30341 (United States)] [Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, 4770 Buford Hwy., Mailstop F53, Atlanta, GA 30341 (United States); Calafat, Antonia M., E-mail: acalafat@cdc.gov [Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, 4770 Buford Hwy., Mailstop F53, Atlanta, GA 30341 (United States); Needham, Larry L. [Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, 4770 Buford Hwy., Mailstop F53, Atlanta, GA 30341 (United States)] [Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, 4770 Buford Hwy., Mailstop F53, Atlanta, GA 30341 (United States)

2009-07-15T23:59:59.000Z

110

DUST-TO-GAS RATIO IN THE EXTREMELY METAL-POOR GALAXY I Zw 18  

SciTech Connect (OSTI)

The blue compact dwarf galaxy I Zw 18 is one of the most metal-poor systems known in the local universe (12+log(O/H) = 7.17). In this work we study I Zw 18 using data from Spitzer, Herschel Space Telescope, and IRAM Plateau de Bure Interferometer. Our data set includes the most sensitive maps of I Zw 18, to date, in both the far-infrared and the CO J = 1 {yields} 0 transition. We use dust emission models to derive a dust mass upper limit of only M{sub dust} {<=} 1.1 Multiplication-Sign 10{sup 4} M{sub Sun} (3{sigma} limit). This upper limit is driven by the non-detection at 160 {mu}m, and it is a factor of 4-10 times smaller than previous estimates (depending on the model used). We also estimate an upper limit to the total dust-to-gas mass ratio of M{sub Dust}/M{sub gas} {<=} 5.0 Multiplication-Sign 10{sup -5}. If a linear correlation between the dust-to-gas mass ratio and metallicity (measured as O/H) were to hold, we would expect a ratio of 3.9 Multiplication-Sign 10{sup -4}. We also show that the infrared spectral energy distribution is similar to that of starbursting systems.

Herrera-Camus, Rodrigo; Fisher, David B.; Bolatto, Alberto D. [Department of Astronomy and Laboratory of Millimeter Astronomy, University of Maryland, College Park, MD 20742 (United States); Leroy, Adam K. [National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903-2475 (United States); Walter, Fabian [Max-Planck-Institut fuer Astronomie, Konigstuehl 17, D-69117 Heidelberg (Germany); Gordon, Karl D.; Roman-Duval, Julia [Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States); Donaldson, Jessica; Melendez, Marcio [Department of Astronomy, University of Maryland, College Park, MD 20742 (United States); Cannon, John M. [Department of Physics and Astronomy, Macalester College, 1600 Grand Avenue, Saint Paul, MN 55105 (United States)

2012-06-20T23:59:59.000Z

111

A COOL DUST FACTORY IN THE CRAB NEBULA: A HERSCHEL STUDY OF THE FILAMENTS  

SciTech Connect (OSTI)

Whether supernovae are major sources of dust in galaxies is a long-standing debate. We present infrared and submillimeter photometry and spectroscopy from the Herschel Space Observatory of the Crab Nebula between 51 and 670 {mu}m as part of the Mass Loss from Evolved StarS program. We compare the emission detected with Herschel with multiwavelength data including millimeter, radio, mid-infrared, and archive optical images. We carefully remove the synchrotron component using the Herschel and Planck fluxes measured in the same epoch. The contribution from line emission is removed using Herschel spectroscopy combined with Infrared Space Observatory archive data. Several forbidden lines of carbon, oxygen, and nitrogen are detected where multiple velocity components are resolved, deduced to be from the nitrogen-depleted, carbon-rich ejecta. No spectral lines are detected in the SPIRE wavebands; in the PACS bands, the line contribution is 5% and 10% at 70 and 100 {mu}m and negligible at 160 {mu}m. After subtracting the synchrotron and line emission, the remaining far-infrared continuum can be fit with two dust components. Assuming standard interstellar silicates, the mass of the cooler component is 0.24{sup +0.32} {sub -0.08} M {sub Sun} for T = 28.1{sup +5.5} {sub -3.2} K. Amorphous carbon grains require 0.11 {+-} 0.01 M {sub Sun} of dust with T = 33.8{sup +2.3} {sub -1.8} K. A single temperature modified blackbody with 0.14 M {sub Sun} and 0.08 M {sub Sun} for silicate and carbon dust, respectively, provides an adequate fit to the far-infrared region of the spectral energy distribution but is a poor fit at 24-500 {mu}m. The Crab Nebula has condensed most of the relevant refractory elements into dust, suggesting the formation of dust in core-collapse supernova ejecta is efficient.

Gomez, H. L.; Clark, C. J. R.; Gomez, E. L.; Gear, W. K. [School of Physics and Astronomy, Cardiff University, The Parade, Cardiff CF24 3AA (United Kingdom); Krause, O.; Besel, M.-A.; Bouwman, J.; Henning, Th. [Max-Planck-Institut fuer Astronomie, Koenigstuhl 17, D-69117 Heidelberg (Germany); Barlow, M. J.; Swinyard, B. M.; Owen, P. J.; Matsuura, M. [Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT (United Kingdom); Rho, J. [SOFIA Science Center, Universities Space Research Association, NASA Ames Research Center, MS 232, Moffett Field, CA 94035 (United States); Ivison, R. J.; Sibthorpe, B. [UK Astronomy Technology Centre, Royal Observatory Edinburgh, Blackford Hill, Edinburgh EH9 3HJ (United Kingdom); Polehampton, E. T. [Space Science and Technology Department, Rutherford Appleton Laboratory, Oxfordshire, OX11 0QX (United Kingdom)

2012-11-20T23:59:59.000Z

112

Dust Charging and Transport on Surfaces  

SciTech Connect (OSTI)

In this paper, we review laboratory studies of dust transport on surfaces in plasmas, performed for a number of different mechanisms: 1) Dust particles were levitated in plasma sheaths by electrostatic forces balancing the gravitational force. 2) Dust was observed to spread over and lift off a surface that repels electrons in a plasma. 3) Dust was transported on surfaces having different secondary electron yields in plasma with an electron beam as a consequence of differential charging. 4) We also report a mechanism of dust transport by electric fields occurring at electron beam impact/shadow boundaries. These processes are candidates to explain the formation of dust ponds that were recently observed in craters on the asteroid Eros by the NEAR Shoemaker spacecraft.

Wang, X. [Colorado Center for Lunar Dust And Atmospheric Studies, University of Colorado, Boulder, CO 80309 (United States); Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80309 (United States); Robertson, S. [Colorado Center for Lunar Dust And Atmospheric Studies, University of Colorado, Boulder, CO 80309 (United States); Department of Physics, University of Colorado, Boulder, CO 80309 (United States); Horanyi, M. [Colorado Center for Lunar Dust And Atmospheric Studies, University of Colorado, Boulder, CO 80309 (United States); Department of Physics, University of Colorado, Boulder, CO 80309 (United States); Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO 80309 (United States)

2011-11-29T23:59:59.000Z

113

Emissions Trading  

Science Journals Connector (OSTI)

Emissions trading is a comparatively new policy instrument which ... electricity systems in Europe. The development of emissions trading thus represents an innovation in its own...

2009-01-01T23:59:59.000Z

114

Optical Properties of Saharan Dust and Asian Dust: Application to Radiative Transfer Simulations  

E-Print Network [OSTI]

Because the bulk optical properties of dust are largely dependent on their chemical composition, published reports from numerous dust field studies enabled us to compile observation data sets to derive the effective complex refractive indices...

Fang, Guangyang

2012-07-16T23:59:59.000Z

115

Dust negative ion acoustic shock waves considering dust size distribution effect  

SciTech Connect (OSTI)

A multi-ion dusty plasma containing hot isothermal electrons, ions (light positive ions and heavy negative ions), and extremely and negatively charged dust grains is studied in the present paper. The dust negative ion acoustic shock waves have been investigated by employing the reductive perturbation method. How the dust size distribution affects the height and the thickness of the nonlinear shock wave is studied. It is noted that the different dust size distribution has different shock wave form and different moving speed.

Ma Yirong; Wang Canglong; Zhang Jianrong; Sun Jianan; Duan Wenshan [College of Physics and Electronic Engineering and Joint Laboratory of Atomic and Molecular Physics of NWNU and IMP CAS, Northwest Normal University, Lanzhou 730070, China and Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China); Yang Lei [College of Physics and Electronic Engineering and Joint Laboratory of Atomic and Molecular Physics of NWNU and IMP CAS, Northwest Normal University, Lanzhou 730070 (China) and Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 (China); Department of Physics, Lanzhou University, Lanzhou 730000 (China)

2012-11-15T23:59:59.000Z

116

Preconcentration of Heavy Metals in Urine and Quantification by Inductively Coupled Plasma Atomic Emission Spectrometry  

Science Journals Connector (OSTI)

......inductively coupled plasma atomic emission spectrometry...inductively coupled plasma spectrometer (se- quential plasma Model 40, Perkin Elmer...employed a 40.78 MHz radiofrequency source...dried in a dust-free atmosphere. Methods was no interference......

M. López-Artíguez; A. Cameán; M. Repetto

1993-01-01T23:59:59.000Z

117

Hot Coal for Christmas: Dust Formation in the Swept-Up Shell Around The Peculiar Type Ib Supernova 2006jc  

E-Print Network [OSTI]

We present evidence for the formation of dust grains in an unusual Type Ib SN based on late-time spectra of SN 2006jc. The progenitor suffered a giant outburst qualitatively similar to those seen in LBVs just 2 years prior to the SN, and we speculate that the dust formation we observe is an indirect consequence of that event. The key evidence for dust formation seen in our optical spectra is (1) the appearance of a strong continuum emission source at red wavelengths, and (2) fading of the redshifted sides of narrow HeI emission lines. These two observed characteristics provide the strongest case yet for dust formation in any Type Ib/c SN. Both developments occurred simultaneously between 51 and 75 days after peak brightness, which is quick compared to other dusty SNe. The high temperature of the dust implies carbon and not silicates, and we describe how infrared photometry may test this conjecture. Geometric considerations indicate dust formation occurring in the dense gas swept-up by the forward shock, and n...

Smith, Nathan; Filippenko, Alexei V

2007-01-01T23:59:59.000Z

118

Circumstellar Dust Shells Detlef Schonberner, Matthias Steffen  

E-Print Network [OSTI]

Circumstellar Dust Shells Detlef Sch¨onberner, Matthias Steffen This research project is concerned spectra and intensity maps computed from the resulting time­dependent wind models can be compared directly as spherical grains of amor­ phous carbon with a radius of 0.05 ¯m, the adopted dust­ to­gas ratio being 1

119

Metal Dusting of Heat-Resistant Alloys  

E-Print Network [OSTI]

Metal dusting leads to disintegration of such alloys as iron and nickel-based into a “dust” of particulate metal, metal carbide, carbon, and/or oxide. It occurs in strongly carburising environments at 400-900°C. Literature survey has shown...

Al-Meshari, Abdulaziz I

120

Global dust model intercomparison in AeroCom phase I  

E-Print Network [OSTI]

Miami (19) cap- ture the transatlantic transport of Saharanside the period of maximum transatlantic Saharan dust trans-stations affected by transatlantic dust transport (stations

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "fugitive dust emissions" 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

Characterisation of Dust Particles Trapped in Silica Aerogels.  

E-Print Network [OSTI]

?? This thesis involves the study of dust particles trapped in silica aerogel for fusion dust diagnostics purpose. The low velocity impact experiments are done… (more)

Liu, Bing

2011-01-01T23:59:59.000Z

122

COMET 22P/KOPFF: DUST ENVIRONMENT AND GRAIN EJECTION ANISOTROPY FROM VISIBLE AND INFRARED OBSERVATIONS  

SciTech Connect (OSTI)

We present optical observations and Monte Carlo models of the dust coma, tail, and trail structures of the comet 22P/Kopff during the 2002 and 2009 apparitions. Dust loss rates, ejection velocities, and power-law size distribution functions are derived as functions of the heliocentric distance using pre- and post-perihelion imaging observations during both apparitions. The 2009 post-perihelion images can be accurately fitted by an isotropic ejection model. On the other hand, strong dust ejection anisotropies are required to fit the near-coma regions at large heliocentric distances (both inbound at r{sub h} = 2.5 AU and outbound at r{sub h} = 2.6 AU) for the 2002 apparition. These asymmetries are compatible with a scenario where dust ejection is mostly seasonally driven, coming mainly from regions near subsolar latitudes at far heliocentric distances inbound and outbound. At intermediate to near-perihelion heliocentric distances, the outgassing would affect much more extended latitude regions, the emission becoming almost isotropic near perihelion. We derived a maximum dust production rate of 260 kg s{sup -1} at perihelion, and an averaged production rate over one orbit of 40 kg s{sup -1}. An enhanced emission rate, also accompanied by a large ejection velocity, is predicted at r{sub h} > 2.5 pre-perihelion. The model has also been extended to the thermal infrared in order to be applied to available trail observations of this comet taken with IRAS and Infrared Space Observatory spacecrafts. The modeled trail intensities are in good agreement with those observations, which is remarkable taking into account that those data are sensitive to dust ejection patterns corresponding to several orbits before the 2002 and 2009 apparitions.

Moreno, Fernando; Pozuelos, Francisco; Aceituno, Francisco; Casanova, Victor; Sota, Alfredo [Instituto de Astrofisica de Andalucia, CSIC, Glorieta de la Astronomia s/n, 18008 Granada (Spain); Castellano, Julio; Reina, Esteban, E-mail: fernando@iaa.es [Amateur Association Cometas-Obs (Spain)

2012-06-20T23:59:59.000Z

123

Large and small-scale structures and the dust energy balance problem in spiral galaxies  

E-Print Network [OSTI]

The interstellar dust content in galaxies can be traced in extinction at optical wavelengths, or in emission in the far-infrared. Several studies have found that radiative transfer models that successfully explain the optical extinction in edge-on spiral galaxies generally underestimate the observed FIR/submm fluxes by a factor of about three. In order to investigate this so-called dust energy balance problem, we use two Milky Way-like galaxies produced by high-resolution hydrodynamical simulations. We create mock optical edge-on views of these simulated galaxies (using the radiative transfer code SKIRT), and we then fit the parameters of a basic spiral galaxy model to these images (using the fitting code FitSKIRT). The basic model includes smooth axisymmetric distributions along a S\\'ersic bulge and exponential disc for the stars, and a second exponential disc for the dust. We find that the dust mass recovered by the fitted models is about three times smaller than the known dust mass of the hydrodynamical in...

Saftly, W; De Geyter, G; Camps, P; Renaud, F; Guedes, J; De Looze, I

2015-01-01T23:59:59.000Z

124

Emissions Trading  

Science Journals Connector (OSTI)

Emissions trading is a market-based instrument to achieve ... The current international dissemination and intended linking of emissions trading schemes underlines the growing relevance of this ... . There are thr...

Edwin Woerdman

2014-06-01T23:59:59.000Z

125

Emissions Trading  

Science Journals Connector (OSTI)

This chapter covers a series of operations which are essential for the implementation of an efficient emissions trading market on the domestic and international level. An introduction to how a national emissions trading

Dr. Michael See

2001-01-01T23:59:59.000Z

126

Charging of Dust Grains in a Plasma  

Science Journals Connector (OSTI)

Charging of micron-sized dust grains in a plasma has been investigated experimentally. Dust grains were dispersed into a fully ionized, steady-state, magnetized plasma column consisting of electrons and K+ ions, both at a temperature of ?0.2 eV. Langmuir probe measurements were used to determine how the negative charge in the plasma is divided between free electrons and dust grains. By varying the ratio d?D between the intergrain spacing and the plasma Debye length, the predicted reduction in the grain charge for the case of "closely packed" grains d?D<1 has been demonstrated experimentally.

A. Barkan; N. D'Angelo; R. L. Merlino

1994-12-05T23:59:59.000Z

127

Morphological Investigations of Fibrogenic Action of Estonian Oil Shale Dust  

E-Print Network [OSTI]

dust produced in the mining and processing of Estonian oil shale is given. Histological examination of

V. A. Kung

128

The gas temperature in circumstellar disks: effects of dust settling  

E-Print Network [OSTI]

The gas temperature in circumstellar disks: effects of dust settling F. Faas, G.J. van Zadelhoff, E distributions. The disk gas-temperature (T ¢¡¢£ ) is in general assumed to be equal to the dust-temperature (T¤¦¥ £ § ), due to collisions. Dust settling depends on both the gas and dust temperature. T

Zadelhoff, Gerd-Jan van

129

Dust-regulated galaxy formation and evolution:A new chemodynamical model with live dust particles  

E-Print Network [OSTI]

Interstellar dust plays decisive roles in the conversion of neutral to molecular hydrogen (H_2), the thermodynamical evolution of interstellar medium (ISM), and the modification of spectral energy distributions (SEDs) of galaxies. These important roles of dust have not been self-consistently included in previous numerical simulations of galaxy formation and evolution. We have therefore developed a new model by which one can investigate whether and how galaxy formation and evolution can be influenced by dust-related physical processes such as photo-electric heating, H_2 formation on dust, and stellar radiation pressure on dust in detail. A novel point of the model is that different dust species in a galaxy are represented by `live dust' particles (i.e., not test particles). Therefore, dust particles in a galaxy not only interact gravitationally with all four components of the galaxy (i.e., dark matter, stars, gas, and dust) but also are grown and destroyed through physical processes of ISM. First we describe a...

Bekki, Kenji

2015-01-01T23:59:59.000Z

130

A stubbornly large mass of cold dust in the ejecta of Supernova 1987A  

E-Print Network [OSTI]

We present new Herschel photometric and spectroscopic observations of Supernova 1987A, carried out in 2012. Our dedicated photometric measurements provide new 70 micron data and improved imaging quality at 100 and 160 micron compared to previous observations in 2010. Our Herschel spectra show only weak CO line emission, and provide an upper limit for the 63 micron [O I] line flux, eliminating the possibility that line contaminations distort the previously estimated dust mass. The far-infrared spectral energy distribution (SED) is well fitted by thermal emission from cold dust. The newly measured 70 micron flux constrains the dust temperature, limiting it to nearly a single temperature. The far-infrared emission can be fitted by 0.5+-0.1 Msun of amorphous carbon, about a factor of two larger than the current nucleosynthetic mass prediction for carbon. The observation of SiO molecules at early and late phases suggests that silicates may also have formed and we could fit the SED with a combination of 0.3 Msun of...

Matsuura, M; Barlow, M J; Babler, B; Baes, M; Meixner, M; Cernicharo, Jose; Clayton, Geoff C; Dunne, L; Fransson, C; Fritz, Jacopo; Gear, Walter; Gomez, H L; Groenewegen, M A T; Indebetouw, R; Ivison, R J; Jerkstrand, A; Lebouteiller, V; Lim, T L; Lundqvist, P; Pearson, C P; Roman-Duval, J; Royer, P; Staveley-Smith, Lister; Swinyard, B M; van Hoof, P A M; van Loon, J Th; Verstappen, Joris; Wesson, Roger; Zanardo, Giovanna; Blommaert, Joris A D L; Decin, Leen; Reach, W T; Sonneborn, George; Van de Steene, Griet C; Yates, Jeremy A

2014-01-01T23:59:59.000Z

131

Airborne Particles in Outdoor Air: Atmospheric Dust  

Science Journals Connector (OSTI)

For industrial products, in addition to the harmful effect like usual particles, the particular harmful effect of atmospheric dust especially metal particles is very large. For example, the light metal element...

Zhonglin Xu

2014-01-01T23:59:59.000Z

132

Surface acoustic wave dust deposition monitor  

DOE Patents [OSTI]

A system is disclosed for using the attenuation of surface acoustic waves to monitor real time dust deposition rates on surfaces. The system includes a signal generator, a tone-burst generator/amplifier connected to a transmitting transducer for converting electrical signals into acoustic waves. These waves are transmitted through a path defining means adjacent to a layer of dust and then, in turn, transmitted to a receiving transducer for changing the attenuated acoustic wave to electrical signals. The signals representing the attenuated acoustic waves may be amplified and used in a means for analyzing the output signals to produce an output indicative of the dust deposition rates and/or values of dust in the layer. 8 figs.

Fasching, G.E.; Smith, N.S. Jr.

1988-02-12T23:59:59.000Z

133

Dust Activity in Comet Hale-Bopp  

Science Journals Connector (OSTI)

Comet Hale-Bopp has shown an extremely elevated level ... large heliocentric distance and that the dust to gas ratio was particularly large. This final factor ... which must be addressed is how typical comet Hale

M. R. Kidger

134

Global coherence of dust density waves  

SciTech Connect (OSTI)

The coherence of self-excited three-dimensional dust density waves has been experimentally investigated by comparing global and local wave properties. For that purpose, three-dimensional dust clouds have been confined in a radio frequency plasma with thermophoretic levitation. Global wave properties have been measured from the line-of-sight integrated dust density obtained from homogenous light extinction measurements. Local wave properties have been obtained from thin, two-dimensional illuminated laser slices of the cloud. By correlating the simultaneous global and local wave properties, the spatial coherence of the waves has been determined. We find that linear waves with small amplitudes tend to be fragmented, featuring an incoherent wave field. Strongly non-linear waves with large amplitudes, however, feature a strong spatial coherence throughout the dust cloud, indicating a high level of synchronization.

Killer, Carsten; Melzer, André [Institut für Physik, Ernst-Moritz-Arndt-Universität Greifswald, 17489 Greifswald (Germany)

2014-06-15T23:59:59.000Z

135

He Puff System For Dust Detector Upgrade  

SciTech Connect (OSTI)

Local detection of surface dust is needed for the safe operation of next-step magnetic fusion devices such as ITER. An electrostatic dust detector, based on a 5 cm x 5 cm grid of interlocking circuit traces biased to 50 V, has been developed to detect dust on remote surfaces and was successfully tested for the first time on the National Spherical Torus Experiment (NSTX). We report on a helium puff system that clears residual dust from this detector and any incident debris or fibers that might cause a permanent short circuit. The entire surface of the detector was cleared of carbon particles by two consecutive helium puffs delivered by three nozzles of 0.45 mm inside diameter. The optimal configuration was found to be with the nozzles at an angle of 30o with respect to the surface of the detector and a helium backing pressure of 6 bar. __________________________________________________

B. Rais, C.H. Skinner A.L. Roquemore

2010-10-01T23:59:59.000Z

136

Ice Nuclei in Marine Air: Biogenic Particles or Dust?  

SciTech Connect (OSTI)

Ice nuclei impact clouds, but their sources and distribution in the atmosphere are still not well known. Particularly little attention has been paid to IN sources in marine environments, although evidence from field studies suggests that IN populations in remote marine regions may be dominated by primary biogenic particles associated with sea spray. In this exploratory model study, we aim to bring attention to this long-neglected topic and identify promising target regions for future field campaigns. We assess the likely global distribution of marine biogenic ice nuclei using a combination of historical observations, satellite data and model output. By comparing simulated marine biogenic immersion IN distributions and dust immersion IN distributions, we predict strong regional differences in the importance of marine biogenic IN relative to dust IN. Our analysis suggests that marine biogenic IN are most likely to play a dominant role in determining IN concentrations in near-surface-air over the Southern Ocean, so future field campaigns aimed at investigating marine biogenic IN should target that region. Climate related changes in the abundance and emission of biogenic marine IN could affect marine cloud properties, thereby introducing previously unconsidered feedbacks that influence the hydrological cycle and the Earth’s energy balance. Furthermore, marine biogenic IN may be an important aspect to consider in proposals for marine cloud brightening by artificial sea spray production.

Burrows, Susannah M.; Hoose, C.; Poschl, U.; Lawrence, M.

2013-01-11T23:59:59.000Z

137

Thermo-Oxidation of Tokamak Carbon Dust  

SciTech Connect (OSTI)

The oxidation of dust and flakes collected from the DIII-D tokamak, and various commercial dust specimens, has been measured at 350 ºC and 2.0 kPa O2 pressure. Following an initial small mass loss, most of the commercial dust specimens showed very little effect due to O2 exposure. Similarly, dust collected from underneath DIII-D tiles, which is thought to comprise largely Grafoil™ particulates, also showed little susceptibility to oxidation at this temperature. However, oxidation of the dust collected from tile surfaces has led to ~ 18% mass loss after 8 hours; thereafter, little change in mass was observed. This suggests that the surface dust includes some components of different composition and/or structure – possibly fragments of codeposited layers. The oxidation of codeposit flakes scraped form DIII-D upper divertor tiles showed an initial 25% loss in mass due to heating in vacuum, and the gradual loss of 30-38% mass during the subsequent 24 hours exposure to O2. This behavior is significantly different from that observed for the oxidation of thinner DIII-D codeposit specimens which were still adhered to tile surfaces, and this is thought to be related to the low deuterium content (D/C ~ 0.03 – 0.04) of the flakes.

J.W. Davis; B.W.N. Fitzpatrick; J.P. Sharpe; A.A. Haasz

2008-04-01T23:59:59.000Z

138

Shut Down Fans, Save $1/4 Million/Yr and Increase Airflow?  

E-Print Network [OSTI]

slightly. This eliminated a small fugitive emission problem that had existed on the hoods of the scrubber system....

Martin, V.; Ohrt, H.

139

E-Print Network 3.0 - atmospheric dust dispersion Sample Search...  

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

residence time of the dust in the atmosphere... - tribution of dust transport and resuspension to particulate matter levels in the Mediterranean atmosphere... ), Saharan dust in...

140

E-Print Network 3.0 - age-dependent dust heating Sample Search...  

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

12;Dust-induced increase... of dust-induced heating was balanced by surface turbulent heat loss, vertical mixing, horizontal transport... model, the dust-induced increase in...

Note: This page contains sample records for the topic "fugitive dust emissions" 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

The flow of interstellar dust through the solar system: the role of dust charging  

SciTech Connect (OSTI)

Interstellar dust can enter the solar system through the relative motion of the Sun with respect to the Local Interstellar Cloud. The trajectories of the dust through the solar system are not only influenced by gravitation and solar radiation pressure forces, but also by the Lorentz forces due to the interaction of the interplanetary magnetic field with the charged dust particles. The interplanetary magnetic field changes on two major time scales: 25 days (solar rotation frequency) and 22 years (solar cycle). The short-term variability averages out for regions that are not too close (>{approx}2 AU) to the Sun. This interplanetary magnetic field variability causes a time-variability in the interstellar dust densities, that is correlated to the solar cycle.In this work we characterize the flow of interstellar dust through the solar system using simulations of the dust trajectories. We start from the simple case without Lorentz forces, and expand to the full simulation. We pay attention to the different ways of modeling the interplanetary magnetic field, and discuss the influence of the dust parameters on the resulting flow patterns. We also discuss the possibilities of using this modeling for prediction of dust fluxes for different space missions or planets, and we pay attention to where simplified models are justified, and where or when a full simulation, including all forces is necessary. One of the aims of this work is to understand measurements of spacecraft like Ulysses, Cassini and Stardust.

Sterken, V. J. [MPIK, Saupfercheckweg 1, D-69117 Heidelberg (Germany); TU Braunschweig, IGEP, Mendelssohnstr. 3, D-38106 Braunschweig (Germany); Altobelli, N.; Schwehm, G. [ESA-ESAC - P.O. Box 78, E-28691 Villanueva de la Canada, Madrid (Spain); Kempf, S. [LASP, University of Colorado, 1234 Innovation Dr, Boulder, CO, 80303-7814 (United States); TU Braunschweig, IGEP, Mendelssohnstr. 3, D-38106 Braunschweig (Germany); Srama, R. [MPIK, Saupfercheckweg 1, D-69117 Heidelberg (Germany); Universitaet Stuttgart, IRS, Pfaffenwaldring 31, D-70569 Stuttgart (Germany); Strub, P. [MPS, Max-Planck-Strasse 2, D-37191 Katlenburg-Lindau (Germany); Gruen, E. [MPIK, Saupfercheckweg 1, D-69117 Heidelberg (Germany); LASP, University of Colorado, 1234 Innovation Dr, Boulder, CO, 80303-7814 (United States)

2011-11-29T23:59:59.000Z

142

Draft Environmental Impact Statement for the Site Selection for the Expansion of the Strategic Petroleum Reserve  

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

2 2 Appendices A - M May 2006 Appendix A Air Quality [This page intentionally left blank] Appendix A: Air Quality A-i Table of Contents Page A.1 SITE PREPARATION AND CONSTRUCTION ....................................................................A-1 A.2 OFF-ROAD EQUIPMENT EMISSIONS.................................................................................A-1 A.3 ON-ROAD UTILITY TRUCKS ................................................................................................A-2 A.4 FUGITIVE DUST .......................................................................................................................A-2 A.5 SITE DEVELOPMENT .............................................................................................................A-3

143

Predicting cyclone emissions with a new computer mode  

E-Print Network [OSTI]

Cyclone emission tests were conducted on 1 D-3D and 2D-2D cyclones with varied outlet tube sizes and inlet velocities. Talc and wheat dusts were used in testing the laboratory scale models. Data from these tests were used in developing a...

Askew, James Wilson

2012-06-07T23:59:59.000Z

144

EVIDENCE FOR A RECEDING DUST SUBLIMATION REGION AROUND A SUPERMASSIVE BLACK HOLE  

SciTech Connect (OSTI)

The near-IR emission in Type 1 active galactic nuclei (AGNs) is thought to be dominated by the thermal radiation from dust grains that are heated by the central engine in the UV/optical and are almost at the sublimation temperature. A brightening of the central source can thus further sublimate the innermost dust, leading to an increase in the radius of the near-IR emitting region. Such changes in radius have been indirectly probed by the measurements of the changes in the time lag between the near-IR and UV/optical light variation. Here we report direct evidence for such a receding sublimation region through the near-IR interferometry of the brightest Type 1 AGN in NGC 4151. The increase in radius follows a significant brightening of the central engine with a delay of at least a few years, which is thus the implied destruction timescale of the innermost dust distribution. Compiling historic flux variations and radius measurements, we also infer the reformation timescale for the inner dust distribution to be several years in this galactic nucleus. More specifically and quantitatively, we find that the radius at a given time seems to be correlated with a long-term average of the flux over the previous several (?6) years, instead of the instantaneous flux. Finally, we also report measurements of three more Type 1 AGNs newly observed with the Keck interferometer, as well as the second epoch measurements for three other AGNs.

Kishimoto, Makoto; Tristram, Konrad R. W.; Weigelt, Gerd [Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn (Germany)] [Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn (Germany); Hönig, Sebastian F.; Antonucci, Robert [Physics Department, University of California, Santa Barbara, CA 93106 (United States)] [Physics Department, University of California, Santa Barbara, CA 93106 (United States); Millan-Gabet, Rafael [Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 (United States)] [Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 (United States); Barvainis, Richard [National Science Foundation, 4301 Wilson Boulevard, Arlington, VA 22230 (United States)] [National Science Foundation, 4301 Wilson Boulevard, Arlington, VA 22230 (United States); Millour, Florentin [Observatoire de la Côte d Azur, Departement FIZEAU, Boulevard de l'Observatoire, BP 4229, F-06304 Nice Cedex 4 (France)] [Observatoire de la Côte d Azur, Departement FIZEAU, Boulevard de l'Observatoire, BP 4229, F-06304 Nice Cedex 4 (France); Kotani, Takayuki, E-mail: mk@mpifr-bonn.mpg.de [National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 (Japan)] [National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 (Japan)

2013-10-01T23:59:59.000Z

145

An integrated analytical framework for quantifying the LCOE of waste-to-energy facilities for a range of greenhouse gas emissions policy and technical factors  

SciTech Connect (OSTI)

This study presents a novel integrated method for considering the economics of waste-to-energy (WTE) facilities with priced greenhouse gas (GHG) emissions based upon technical and economic characteristics of the WTE facility, MSW stream, landfill alternative, and GHG emissions policy. The study demonstrates use of the formulation for six different policy scenarios and explores sensitivity of the results to ranges of certain technical parameters as found in existing literature. The study shows that details of the GHG emissions regulations have large impact on the levelized cost of energy (LCOE) of WTE and that GHG regulations can either increase or decrease the LCOE of WTE depending on policy choices regarding biogenic fractions from combusted waste and emissions from landfills. Important policy considerations are the fraction of the carbon emissions that are priced (i.e. all emissions versus only non-biogenic emissions), whether emissions credits are allowed due to reducing fugitive landfill gas emissions, whether biogenic carbon sequestration in landfills is credited against landfill emissions, and the effectiveness of the landfill gas recovery system where waste would otherwise have been buried. The default landfill gas recovery system effectiveness assumed by much of the industry yields GHG offsets that are very close to the direct non-biogenic GHG emissions from a WTE facility, meaning that small changes in the recovery effectiveness cause relatively larger changes in the emissions factor of the WTE facility. Finally, the economics of WTE are dependent on the MSW stream composition, with paper and wood being advantageous, metal and glass being disadvantageous, and plastics, food, and yard waste being either advantageous or disadvantageous depending upon the avoided tipping fee and the GHG emissions price.

Townsend, Aaron K., E-mail: aarontownsend@utexas.edu [Department of Mechanical Engineering, University of Texas at Austin, 1 University Station C2200, Austin, TX 78712 (United States); Webber, Michael E. [Department of Mechanical Engineering, University of Texas at Austin, 1 University Station C2200, Austin, TX 78712 (United States)

2012-07-15T23:59:59.000Z

146

Cold condensation of dust in the ISM  

E-Print Network [OSTI]

The condensation of complex silicates with pyroxene and olivine composition at conditions prevailing in molecular clouds has been experimentally studied. For this purpose, molecular species comprising refractory elements were forced to accrete on cold substrates representing the cold surfaces of surviving dust grains in the interstellar medium. The efficient formation of amorphous and homogeneous magnesium iron silicates at temperatures of about 12 K has been monitored by IR spectroscopy. The gaseous precursors of such condensation processes in the interstellar medium are formed by erosion of dust grains in supernova shock waves. In the laboratory, we have evaporated glassy silicate dust analogs and embedded the released species in neon ice matrices that have been studied spectroscopically to identify the molecular precursors of the condensing solid silicates. A sound coincidence between the 10 micron band of the interstellar silicates and the 10 micron band of the low-temperature siliceous condensates can be...

Rouillé, Gaël; Krasnokutski, Serge A; Krebsz, Melinda; Henning, Thomas

2015-01-01T23:59:59.000Z

147

LOOKING THROUGH THE GALACTIC PLANE: IMAGING COLD DUST TOWARD l = 44 DEG  

SciTech Connect (OSTI)

We present imaging observations of continuum emission from interstellar dust at 850 and 1200 {mu}m of a section of the Galactic Plane covering 2 deg{sup 2} centered at l = 44 DEG. Complementary jiggle-mapping and fast-scanning techniques were used, respectively, at these two wavelengths. The mapped area includes the well-known star formation regions W49 and G45.1/45.5. Using an automated clump-finding routine, we identify 132 compact 850 {mu}m emission features within the region above a completeness level of about 200 mJy beam{sup -1}. The positions of the latter objects were used to determine fluxes from the 1200 {mu}m image. Spectral line data were subsequently obtained with the same observing beamwidth as at 850 {mu}m for almost half of the objects; these were either imaged in the {sup 13}CO (3-2) line, or basic characteristics determined using the {sup 12}CO (3-2) transition. We use these data, supplemented by existing {sup 13}CO (1-0) and H I survey data, to determine distances and hence derive masses for the dust clump ensemble, assuming a uniform dust temperature of 15 K. From these data we find that the number-mass relationship for clumps in the field is similar to that found for individual star-forming regions.

Matthews, Henry; Kirk, Helen; Johnstone, Doug [National Research Council Canada, Herzberg Institute of Astrophysics, 5071 West Saanich Rd, Victoria, BC, V9E 2E7 (Canada); Weferling, Bernd [University of Hannover, IDMP, Welfengarten 1, 30167 Hannover (Germany); Cohen, Martin [Radio Astronomy Laboratory, University of California at Berkeley, CA 94720 (United States); Jenness, Tim; Davis, Gary [Joint Astronomy Centre, Hilo, HI 96720 (United States); Evans, Aneurin [School of Physical and Geographical Sciences, Keele University (United Kingdom); Dent, William R. F. [Atacama Large Millimeter Array (Chile); Fuller, Gary [University of Manchester, School of Physics and Astronomy Manchester, M60 1QD (United Kingdom); Jackson, James M.; Rathborne, Jill [Department Astronomy, Boston University, MA 02215 (United States); Richer, John [Mullard Radio Astronomy Obs., Cavendish Laboratory Street, Cambridge CB3 0HE (United Kingdom); Simon, Robert [Physikalisches Institut, Universitaet zu Koeln (Germany)], E-mail: henry.matthews@nrc-cnrc.gc.ca

2009-11-15T23:59:59.000Z

148

The Dust Properties of Bubble HII Regions as seen by Herschel  

E-Print Network [OSTI]

Because of their relatively simple morphology, "bubble" HII regions have been instrumental to our understanding of star formation triggered by HII regions. With the far-infrared (FIR) spectral coverage of the Herschel satellite, we can access the wavelengths where these regions emit the majority of their energy through their dust emission. At Herschel wavelengths 70 micron to 500 micron, the emission associated with HII regions is dominated by the cool dust in their photodissociation regions (PDRs). We find average dust temperatures of 26K along the PDRs, with little variation between the HII regions in the sample, while local filaments and infrared dark clouds average 19K and 15K respectively. Higher temperatures lead to higher values of the Jeans mass, which may affect future star formation. The mass of the material in the PDR, collected through the expansion of the HII region, is between ~300 and ~10,000 Solar masses for the HII regions studied here. These masses are in rough agreement with the expected ma...

Anderson, L D; Deharveng, L; Abergel, A; Motte, F; Andre, Ph; Bernard, J -P; Bontemps, S; Hennemann, M; Hill, T; Rodon, J A; Roussel, H; Russeil, D

2012-01-01T23:59:59.000Z

149

The heating mechanism for the warm/cool dust in powerful, radio-loud AGN  

E-Print Network [OSTI]

The uncertainty surrounding the nature of the heating mechanism for the dust that emits at mid- to far-IR (MFIR) wavelengths in active galaxies limits our understanding of the links between active galactic nuclei (AGN) and galaxy evolution, as well as our ability to interpret the prodigious infrared and sub-mm emission of some of the most distant galaxies in the Universe. Here we report deep Spitzer observations of a complete sample of powerful, intermediate redshift (0.05 power, as traced by [OIII]5007 emission, is strongly correlated with both the mid-IR (24 micron) and the far-IR (70 micron) luminosities, however, with increased scatter in the 70 micron correlation. A major cause of this increased scatter is a group of objects that falls above the main correlation and displays evidence for prodigious recent star formation activity at optical wavelengths, along with relatively cool MFIR colours. These results provide evidence that illumination by the AGN is the primary heating mechanism for the dust emitting at both 24 and 70 microns, with starbursts dominating the heating of the cool dust in only 20 -- 30% of objects. This implies that powerful AGN are not always accompanied by the type of luminous starbursts that are characteristic of the peak of activity in major gas-rich mergers.

C. Tadhunter; D. Dicken; J. Holt; K. Inskip; R. Morganti; D. Axon; C. Buchanan; R. González Delgado; P. Barthel; I. van Bemmel

2007-03-30T23:59:59.000Z

150

Solar Dust Ring Observation At The Total Solar Eclipse In Mexico  

Science Journals Connector (OSTI)

There are dust grains in interplanetary space. Zodiacal light observations show a distribution of dust grains in the ecliptic plane, but cannot show how close to the Sun dust grains survive. Dust grains close ...

Syuzo Isobe; Toshihiko Tanabe…

1992-01-01T23:59:59.000Z

151

Dust Measurement With Thomson Scattering In FTU  

SciTech Connect (OSTI)

The size distribution of dust particles present in FTU after disruptions has been evaluated in the range 0.05 {mu}m-0.1 {mu}m using the Thomson scattering system. Rayleigh approximation has been used to estimate the dust size. The distribution, although the radii considered do not differ more than an order of magnitude, behave like a power law. The laser energy density far exceed that necessary to vaporize, at least partially, the particles. This can affect the previous estimate of the particle sizes, and suggests that the effective radii might be larger than the estimated values. A preliminary analysis on the broad band signal is presented.

Giovannozzi, E.; Castaldo, C.; Maddaluno, G.; Rydzy, A. [Associazione EURATOM-ENEA sulla fusione, CR Frascati, c.p. 65, 00044 Frascati, RM (Italy); Ratynskaia, S. [Royal Institute of Technology (KTH), SE-100 44 Stockholm (Sweden)

2008-03-12T23:59:59.000Z

152

Dust-Gas Interrelations In Comets: Observations And Theory  

Science Journals Connector (OSTI)

Comet Hale-Bopp (C/1995 O1) was discovered ... comet, in the sense of release of gas and dust in modern times. This has ... of important issues regarding interrelations between dust and gas in comets, a descripti...

Michael R. Combi; KONSTANTIN KABIN; Darren L. DeZEEUW…

153

airborne respirable dust: Topics by E-print Network  

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

Distributed Sensor Networks and Ad-hoc Networking 4 1.2.2 High Level Interpretation of Spatial Sensor Data 4 1.2.3 Distributed Processing 5 1.2.4 COTS Dust 6 2.0 COTS Dust...

154

Lunar Atmosphere and Dust Environment Explorer Frequently Asked Questions  

E-Print Network [OSTI]

LADEE Lunar Atmosphere and Dust Environment Explorer Frequently Asked Questions What mystery: was lunar dust, electrically charged by solar ultraviolet light, responsible for the presunrise of space exploration through our expertise in science, engineering, mission operations, and data management

Mojzsis, Stephen J.

155

Linear and nonlinear dynamics of a dust bicrystal consisting of positive and negative dust particles  

SciTech Connect (OSTI)

A dusty plasma crystalline configuration consisting of charged dust grains of alternating charge sign ({center_dot}{center_dot}{center_dot}/+/-/+/-/+/{center_dot}{center_dot}{center_dot}) and mass is considered. Both charge and mass of each dust species are taken to be constant. Considering the equations of longitudinal motion, a dispersion relation for linear longitudinal vibrations is derived from first principles and then analyzed. Two harmonic modes are obtained, namely, an acoustic mode and an inverse-dispersive optic-like one. The nonlinear aspects of acoustic longitudinal dust grain motion are addressed via a generalized Boussinesq (and, alternatively, a generalized Korteweg-de Vries) description.

Kourakis, I.; Shukla, P.K.; Morfill, G.E. [Institut fuer Theoretische Physik IV and Centre for Plasma Science and Astrophysics, Fakultaet fuer Physik und Astronomie, Ruhr-Universitaet Bochum, D-44780 Bochum (Germany); Max-Planck Institut fuer Extraterrestrische Physik, Giessenbachstrasse, D-85740 Garching (Germany)

2005-11-15T23:59:59.000Z

156

The Dust Explosion Characteristics of Coal Dust in an Oxygen Enriched Atmosphere  

Science Journals Connector (OSTI)

The ability to mix pulverised coal with oxygen at concentrations greater than the currently applied 21% may well provide advantages for burner design in oxy/coal fired systems. However the risk of dust explosions increases significantly with increasing oxygen concentration and temperature. In this study the influence of enriched oxygen concentrations is researched on the dust explosion characteristics of Indonesian (Sebuku) high volatile bituminous coal dust and on Pittsburgh Coal n¡8. Both ignition sensitivity characteristics (minimum ignition energy and minimum ignition temperatures) and explosion severity characteristics (maximum explosion pressure, Pmax, and maximum rate of pressure rise, Kst) are investigated.

Frederik Norman; Jan Berghmans; Filip Verplaetsen

2012-01-01T23:59:59.000Z

157

80From Dust Grains to Dust Balls A cosmic dust grain about 0.1mm across captured by a  

E-Print Network [OSTI]

-altitude aircraft. Probably debris from a passing comet Planets are built in several stages. The first Problem 2 ­Answer: The change in the mass, dM, occurs as a quantity of dust grains land on the surface in the interstellar gas, times the speed of the grains landing on the surface. This leads to m x N x V where m

158

Statistical charge distribution over dust particles in a non-Maxwellian Lorentzian plasma  

SciTech Connect (OSTI)

On the basis of statistical mechanics and charging kinetics, the charge distribution over uniform size spherical dust particles in a non-Maxwellian Lorentzian plasma is investigated. Two specific situations, viz., (i) the plasma in thermal equilibrium and (ii) non-equilibrium state where the plasma is dark (no emission) or irradiated by laser light (including photoemission) are taken into account. The formulation includes the population balance equation for the charged particles along with number and energy balance of the complex plasma constituents. The departure of the results for the Lorentzian plasma, from that in case of Maxwellian plasma, is graphically illustrated and discussed; it is shown that the charge distribution tends to results corresponding to Maxwellian plasma for large spectral index. The charge distribution predicts the opposite charging of the dust particles in certain cases.

Mishra, S. K. [Institute for Plasma Research (IPR), Gandhinagar-382428 (India); Misra, Shikha, E-mail: shikhamish@gmail.com [Centre for Energy Studies (CES), Indian Institute of Technology Delhi (IITD), New Delhi-110016 (India)

2014-07-15T23:59:59.000Z

159

An Alternate Approach to Determine the Explosibility of Dusts  

E-Print Network [OSTI]

dust cloud; a 10,000 Joule (10 kJ) flame is subsequently forced through the dust cloud and the resulting pressure rise is measured. If the pressure rise exceeds one bar (14.5 psig), it is assumed that a deflagration occurred, and the dust is classified...

Ganesan, Balaji

2013-12-04T23:59:59.000Z

160

E-Print Network 3.0 - areas treating landfill Sample Search Results  

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

Conference COMPARISON OF AIR EMISSIONS FROM WASTE MANAGEMENT FACILITIES Summary: .K. dioxins emissions have been reported in the fugitive gas emissions from landfills as well as...

Note: This page contains sample records for the topic "fugitive dust emissions" 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

"Separations: Dust to Dust" or " You Can't Escape Em"  

E-Print Network [OSTI]

"SEPARATIONS: DUST TO DUST" OR "YOU CAN'T ESCAPE EM" Robert G. Massey Office of Industrial Programs U.S. Dept. of Energy ABSTRACT Separations are recognized by industry as one of the larger, if not the largest, energy using processes... are used to separate mixtures into their components. Three projects of the Office of Industrial Programs, Department of Energy illustrate these categories. Moltox is an air separation process based on the oxidation/reduction equilibrium of molten alkali...

Massey, R. G.

162

The Dust Accelerator Facility of the Colorado Center for Lunar Dust and Atmospheric Studies  

SciTech Connect (OSTI)

The NASA Lunar Institute's Colorado Center for Lunar Dust and Atmospheric Studies has recently completed the construction of a new experimental facility to study hypervelocity dust impacts. The installation includes a 3 MV Pelletron, accelerating small particles in the size range of 0.1 to few microns to velocities in the range of 1 to 100 km/s. Here we report the capabilities of our facility, and the results of our first experiments.

Horanyi, M.; Colette, A.; Drake, K.; Gruen, E.; Kempf, S.; Munsat, T.; Robertson, S.; Shu, A.; Sternovsky, Z.; Wang, X. [NASA Lunar Science Institute Colorado Center for Lunar Dust and Atmospheric Studies University of Colorado, Boulder, CO, 80309 (United States)

2011-11-29T23:59:59.000Z

163

Dust Studies in DIII-D and TEXTOR  

SciTech Connect (OSTI)

Studies of naturally occurring and artificially introduced carbon dust are conducted in DIII-D and TEXTOR. In DIII-D, dust does not present operational concerns except immediately after entry vents. Energetic plasma disruptions produce significant amounts of dust. However, dust production by disruptions alone is insufficient to account for the estimated in-vessel dust inventory in DIII-D. Submicron sized dust is routinely observed using Mie scattering from a Nd:Yag laser. The source is strongly correlated with the presence of Type I edge localized modes (ELMs). Larger size (0.005-1 mm diameter) dust is observed by optical imaging, showing elevated dust levels after entry vents. Inverse dependence of the dust velocity on the inferred dust size is found from the imaging data. Migration of pre-characterized carbon dust is studied in DIII-D and TEXTOR by injecting micron-size dust in plasma discharges. In DIII-D, a sample holder filled with {approx}30 mg of dust is introduced in the lower divertor and exposed to high-power ELMing H-mode discharges with strike points swept across the divertor floor. After a brief exposure ({approx}0.1 s) at the outer strike point, part of the dust is injected into the plasma, raising the core carbon density by a factor of 2-3 and resulting in a twofold increase of the radiated power. Individual dust particles are observed moving at velocities of 10-100 m/s, predominantly in the toroidal direction, consistent with the drag force from the deuteron flow and in agreement with modeling by the 3D DustT code. In TEXTOR, instrumented dust holders with 1-45 mg of dust are exposed in the scrape-off layer 0-2 cm radially outside of the last closed flux surface in discharges heated with neutral beam injection (NBI) power of 1.4 MW. Dust is launched either in the beginning of a discharge or at the initiation of NBI, preferentially in a direction perpendicular to the toroidal magnetic field. At the given configuration of the launch, the dust did not penetrate the core plasma and only moderately perturbed the edge plasma, as evidenced by an increase of the edge carbon content.

Rudakov, D; Litnovsky, A; West, W; Yu, J; Boedo, J; Bray, B; Brezinsek, S; Brooks, N; Fenstermacher, M; Groth, M; Hollmann, E; Huber, A; Hyatt, A; Krasheninnikov, S; Lasnier, C; Moyer, R; Pigarov, A; Philipps, V; Pospieszezyk, A; Smirnov, R; Sharpe, J; Solomon, W; Watkins, J; Wong, C

2008-10-14T23:59:59.000Z

164

U.S. zero emission coal alliance techology  

SciTech Connect (OSTI)

For coal to maintain its major role in supplying the world's energy, eventually all emissions to the atmosphere must be eliminated. Not only must conventional pollutants, like sulfur compounds and dust particles be kept out of the air, but also the far larger quantities of carbon dioxide that result from the combustion of carbon. We present a new technology for coal-based power that generates hydrogen from carbon and water, avoids emissions to the atmosphere, and disposes of the carbon dioxide as inert, solid mineral carbonates. Based on the available resources, coal power is sustainable for centuries. Our zero emission technology makes coal energy as clean as renewable energy.

Lackner, K. S. (Klaus S.); Ziock, H. J. (Hans-Joachim)

2001-01-01T23:59:59.000Z

165

Radioactive Air Emissions Notice of Construction (NOC) for the 300 Area Process Sewer Cleanout  

SciTech Connect (OSTI)

This document serves as a NOC pursuant to the requirements of Washington Administrative Code (WAC) 246-247-060, and as a request for approval to construct pursuant to 40 Code of Federal Regulations (CFR) 61.07, for the cleanout of sections of the 300 Area PS. Approval of the NOC will allow the pressure washing of certain pipe sections, the sump in the TEDF lift station, and the cleaning of PS 16 of the 300 Area PS that contains low levels of radioactivity. Section 15.0 of this NOC discusses the estimated total effective dose equivalent (TEDE) to the offsite maximally exposed individual (MEI) resulting from the unabated emissions from these cleaning activities. Using the currently approved unit dose conversion factors in HNF-3602, the estimated potential TEDE to the MEI resulting from the unabated, fugitive emissions from cleanout of the 300 Area PS is 4.70 E-05 millirem (mrem) per year. This dose was derived by conservatively estimating the doses from both the pressure washing and the use of the Guzzler{trademark} for removal of the liquid/soil mixture, as described in Section 5.0. and adding these doses together.

MENARD, N.M.

2000-06-16T23:59:59.000Z

166

3 MV hypervelocity dust accelerator at the Colorado Center for Lunar Dust and Atmospheric Studies  

SciTech Connect (OSTI)

A hypervelocity dust accelerator for studying micrometeorite impacts has been constructed at the Colorado Center for Lunar Dust and Atmospheric Studies (CCLDAS) at the University of Colorado. Based on the Max-Planck-Instituet fuer Kernphysik (MPI-K) accelerator, this accelerator is capable of emitting single particles of a specific mass and velocity selected by the user. The accelerator consists of a 3 MV Pelletron generator with a dust source, four image charge pickup detectors, and two interchangeable target chambers: a large high-vacuum test bed and an ultra-high vacuum impact study chamber. The large test bed is a 1.2 m diameter, 1.5 m long cylindrical vacuum chamber capable of pressures as low as 10{sup -7} torr while the ultra-high vacuum chamber is a 0.75 m diameter, 1.1 m long chamber capable of pressures as low as 10{sup -10} torr. Using iron dust of up to 2 microns in diameter, final velocities have been measured up to 52 km/s. The spread of the dust particles and the effect of electrostatic focusing have been measured using a long exposure CCD and a quartz target. Furthermore, a new technique of particle selection is being developed using real time digital filtering techniques. Signals are digitized and then cross-correlated with a shaped filter, resulting in a suppressed noise floor. Improvements over the MPI-K design, which include a higher operating voltage and digital filtering for detection, increase the available parameter space of dust emitted by the accelerator. The CCLDAS dust facility is a user facility open to the scientific community to assist with instrument calibrations and experiments.

Shu, Anthony; Horanyi, Mihaly; Kempf, Sascha; Thomas, Evan [Colorado Center for Lunar Dust and Atmospheric Studies, Boulder, Colorado 80303 (United States); Department of Physics, University of Colorado, Boulder, Colorado 80309 (United States); Laboratory for Atmospheric and Space Physics, 1234 Innovation Drive, Boulder, Colorado 80303 (United States); Collette, Andrew; Drake, Keith; Northway, Paige [Colorado Center for Lunar Dust and Atmospheric Studies, Boulder, Colorado 80303 (United States); Laboratory for Atmospheric and Space Physics, 1234 Innovation Drive, Boulder, Colorado 80303 (United States); Gruen, Eberhard [Colorado Center for Lunar Dust and Atmospheric Studies, Boulder, Colorado 80303 (United States); MPI fuer Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg (Germany); Mocker, Anna [Colorado Center for Lunar Dust and Atmospheric Studies, Boulder, Colorado 80303 (United States); MPI fuer Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg (Germany); IRS, Universitaet Stuttgart, Pfaffenwaldring 31, D-70569 Stuttgart (Germany); Munsat, Tobin [Colorado Center for Lunar Dust and Atmospheric Studies, Boulder, Colorado 80303 (United States); Department of Physics, University of Colorado, Boulder, Colorado 80309 (United States); Srama, Ralf [MPI fuer Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg (Germany); IRS, Universitaet Stuttgart, Pfaffenwaldring 31, D-70569 Stuttgart (Germany); and others

2012-07-15T23:59:59.000Z

167

Radon emissions  

Science Journals Connector (OSTI)

... SIR,-Wendy Barnaby (August 28) writes on the problem of radon emission from the tailings of uranium milling in Sweden. This problem would arise from ... that has to be treated. She describes Professor Robert O. Pohl's report that "radon can escape more easily from the broken ground of a mine than from an undisturbed ...

SVEN-ERIC BRUNNSJO

1975-10-09T23:59:59.000Z

168

Dust Plume Modeling at Fort Bliss: Move-Out Operations, Combat Training and Wind Erosion  

SciTech Connect (OSTI)

The potential for air-quality impacts from heavy mechanized vehicles operating in the training ranges and on the unpaved main supply routes at Fort Bliss was investigated. This report details efforts by the staff of Pacific Northwest National Laboratory for the Fort Bliss Directorate of Environment in this investigation. Dust emission and dispersion from typical activities, including move outs and combat training, occurring on the installation were simulated using the atmospheric modeling system DUSTRAN. Major assumptions associated with designing specific modeling scenarios are summarized, and results from the simulations are presented.

Chapman, Elaine G.; Rishel, Jeremy P.; Rutz, Frederick C.; Seiple, Timothy E.; Newsom, Rob K.; Allwine, K Jerry

2006-09-29T23:59:59.000Z

169

Design of a new cotton dust sampler  

E-Print Network [OSTI]

with the development of a penetration curve which resulted in a cutpoint of 10. 1 pm with a slope of 1. 31. The operating characteristics of the cyclone cotton dust sampler are: a sampling rate of 50 liters per minute, collection of particulate on top of a... SAMPLER AT VARIOUS INLET CONFIGURATIONS AND SAMPLING RATES Page 40 PENETRATION VALUES OF PARTICLE DIAMETERS INVESTI- GATED AT THREE DIFFERENT HEIGHTS ABOVE THE INLET OF THE CYCLONE SAMPLER PENETRATION VALUES USED TO DETERMINE CYCLONE SAMPLER...

Hickman, Phillip Dean

2012-06-07T23:59:59.000Z

170

A Strategy to Minimize Dust Foregrounds in B-mode Searches  

E-Print Network [OSTI]

The Planck satellite has identified several patches of sky with low polarized dust emission, obvious targets for searches for the cosmic-microwave-background (CMB) B-mode signal from inflationary gravitational waves. Still, given the Planck measurement uncertainties, the polarized dust foregrounds in these different candidate patches may differ by an order of magnitude or more. Here we show that a brief initial experiment to map these candidate patches more deeply at a single high frequency can efficiently zero in on the cleanest patch(es) and thus improve significantly the sensitivity of subsequent B-mode searches. A ground-based experiment with current detector technology operating at >~220 GHz for 3 months can efficiently identify a low-dust-amplitude patch and thus improve by up to 20%-60% on the sensitivity to cosmic B modes of the subsequent lower-frequency deep integration. A balloon experiment with current detector sensitivities covering the set of patches and operating at ~350 GHz can reach a similar...

Kovetz, Ely D

2015-01-01T23:59:59.000Z

171

Molecular Hydrogen Emission from Protoplanetary Disks  

E-Print Network [OSTI]

We have modeled self-consistently the density and temperature profiles of gas and dust in protoplanetary disks, taking into account irradiation from a central star. Making use of this physical structure, we have calculated the level populations of molecular hydrogen and the line emission from the disks. As a result, we can reproduce the observed strong line spectra of molecular hydrogen from protoplanetary disks, both in the ultraviolet (UV) and the near-infrared, but only if the central star has a strong UV excess radiation.

H. Nomura; T. J. Millar

2005-05-06T23:59:59.000Z

172

Technology Assessment of Dust Suppression Techniques Applied During Structural Demolition  

SciTech Connect (OSTI)

Hanford, Fernald, Savannah River, and other sites are currently reviewing technologies that can be implemented to demolish buildings in a cost-effective manner. In order to demolish a structure properly and, at the same time, minimize the amount of dust generated from a given technology, an evaluation must be conducted to choose the most appropriate dust suppression technology given site-specific conditions. Thus, the purpose of this research, which was carried out at the Hemispheric Center for Environmental Technology (HCET) at Florida International University, was to conduct an experimental study of dust aerosol abatement (dust suppression) methods as applied to nuclear D and D. This experimental study targeted the problem of dust suppression during the demolition of nuclear facilities. The resulting data were employed to assist in the development of mathematical correlations that can be applied to predict dust generation during structural demolition.

Boudreaux, J.F.; Ebadian, M.A.; Williams, P.T.; Dua, S.K.

1998-10-20T23:59:59.000Z

173

Dust accelerators and their applications in high-temperature plasmas  

SciTech Connect (OSTI)

The perennial presence of dust in high-temperature plasma and fusion devices has been firmly established. Dust inventory must be controlled, in particular in the next-generation steady-state fusion machines like ITER, as it can pose significant safety hazards and potentially interfere with fusion energy production. Much effort has been devoted to gening rid of the dust nuisance. We have recognized a number of dust-accelerators applications in magnetic fusion, including in plasma diagnostics, in studying dust-plasma interactions, and more recently in edge localized mode (ELM)'s pacing. With the applications in mind, we will compare various acceleration methods, including electrostatic, gas-drag, and plasma-drag acceleration. We will also describe laboratory experiments and results on dust acceleration.

Wang, Zhehui [Los Alamos National Laboratory; Ticos, Catakin M [NILPRP, ROMANIA

2010-01-01T23:59:59.000Z

174

CURVED WALLS: GRAIN GROWTH, SETTLING, AND COMPOSITION PATTERNS IN T TAURI DISK DUST SUBLIMATION FRONTS  

SciTech Connect (OSTI)

The dust sublimation walls of disks around T Tauri stars represent a directly observable cross-section through the disk atmosphere and midplane. Their emission properties can probe the grain size distribution and composition of the innermost regions of the disk, where terrestrial planets form. Here we calculate the inner dust sublimation wall properties for four classical T Tauri stars with a narrow range of spectral types and inclination angles and a wide range of mass accretion rates to determine the extent to which the walls are radially curved. Best fits to the near- and mid-IR excesses are found for curved, two-layer walls in which the lower layer contains larger, hotter, amorphous pyroxene grains with Mg/(Mg+Fe) = 0.6 and the upper layer contains submicron, cooler, mixed amorphous olivine and forsterite grains. As the mass accretion rates decrease from 10{sup –8} to 10{sup –10} M{sub ?} yr{sup –1}, the maximum grain size in the lower layer decreases from ?3 to 0.5 ?m. We attribute this to a decrease in fragmentation and turbulent support for micron-sized grains with decreasing viscous heating. The atmosphere of these disks is depleted of dust with dust-gas mass ratios 1 × 10{sup –4} of the interstellar medium (ISM) value, while the midplane is enhanced to eight times the ISM value. For all accretion rates, the wall contributes at least half of the flux in the optically thin 10 ?m silicate feature. Finally, we find evidence for an iron gradient in the disk, suggestive of that found in our solar system.

McClure, M. K.; Calvet, N.; Hartmann, L.; Ingleby, L. [Department of Astronomy, The University of Michigan, 500 Church Street, 830 Dennison Building., Ann Arbor, MI 48109 (United States); D'Alessio, P. [Centro de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, 58089 Morelia, Michoacán (Mexico); Espaillat, C. [Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Sargent, B. [Center for Imaging Science and Laboratory for Multiwavelength Astrophysics, Rochester Institute of Technology, 54 Lomb Memorial Drive, Rochester, NY 14623 (United States); Watson, D. M. [Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627 (United States); Hernández, J., E-mail: melisma@umich.edu, E-mail: ncalvet@umich.edu, E-mail: lhartm@umich.edu, E-mail: lingleby@umich.edu, E-mail: p.dalessio@astrosmo.unam.mx, E-mail: cespaillat@cfa.harvard.edu, E-mail: baspci@rit.edu, E-mail: dmw@pas.rochester.edu, E-mail: hernandj@cida.ve [Centro de Investigaciones de Astronomía (CIDA), Mérida 5101-A (Venezuela, Bolivarian Republic of)

2013-10-01T23:59:59.000Z

175

PROBING INTERSTELLAR DUST WITH INFRARED ECHOES FROM THE Cas A SUPERNOVA  

SciTech Connect (OSTI)

We present the analysis of an Infrared Spectrograph 5-38 {mu}m spectrum and Multiband Imaging Photometer for Spitzer photometric measurements of an infrared echo near the Cassiopeia A (Cas A) supernova (SN) remnant observed with the Spitzer Space Telescope. We have modeled the recorded echo accounting for polycyclic aromatic hydrocarbons (PAHs), quantum-heated carbon and silicate grains, as well as thermal carbon and silicate particles. Using the fact that optical light-echo spectroscopy has established that Cas A originated from a Type IIb SN explosion showing an optical spectrum remarkably similar to the prototypical Type IIb SN 1993J, we use the latter to construct template data input for our simulations. We are then able to reproduce the recorded infrared echo spectrum by combining the emission of dust heated by the UV burst produced at the shock breakout after the core-collapse and dust heated by optical light emitted near the visual maximum of the SN light curve, where the UV burst and optical light curve characteristics are based on SN 1993J. We find a mean density of {approx}680 H cm{sup -3} for the echo region, with a size of a few light years across. We also find evidence of dust processing in the form of a lack of small PAHs with less than {approx}300 carbon atoms, consistent with a scenario of PAHs destruction by the UV burst via photodissociation at the estimated distance of the echo region from Cas A. Furthermore, our simulations suggest that the weak 11 {mu}m features of our recorded infrared echo spectrum are consistent with a strong dehydrogenated state of the PAHs. This exploratory study highlights the potential of investigating dust processing in the interstellar medium through infrared echoes.

Vogt, Frederic P. A. [Mount Stromlo Observatory, Research School of Astronomy and Astrophysics, The Australian National University, Cotter Road, Weston Creek, ACT 2611 (Australia); Besel, Marc-Andre; Krause, Oliver; Dullemond, Cornelis P., E-mail: fvogt@mso.anu.edu.au [Max-Planck Institut fuer Astronomie, Koenigstuhl 17, 69117 Heidelberg (Germany)

2012-05-10T23:59:59.000Z

176

Dust-induced instability in a rotating plasma  

SciTech Connect (OSTI)

The effect of immobile dust on stability of a magnetized rotating plasma is analyzed. In the presence of dust, a term containing an electric field appears in the one-fluid equation of plasma motion. This electric field leads to an instability of the magnetized rotating plasma called the dust-induced rotational instability (DRI). The DRI is related to the charge imbalance between plasma ions and electrons introduced by the presence of charged dust. In contrast to the well-known magnetorotational instability requiring the decreasing radial profile of the plasma rotation frequency, the DRI can appear for an increasing rotation frequency profile.

Mikhailovskii, A. B.; Vladimirov, S. V.; Lominadze, J. G.; Tsypin, V. S.; Churikov, A. P.; Erokhin, N. N.; Galvao, R. M. O. [Institute of Nuclear Fusion, Russian Research Centre Kurchatov Institute, 1, Kurchatov Sq., Moscow 123182 (Russian Federation); School of Physics, University of Sydney, Sydney, N.S.W. 2006 (Australia); Kharadze Abastumani National Astrophysical Observatory, 2a, Kazbegi Ave., Tbilisi 0160 (Georgia); Brazilian Center for Physics Research, Rua Xavier Sigaud, 150, 22290-180, Rio de Janeiro (Brazil); Syzran Branch of Samara Technical University, 45, Sovetskaya Str., Syzran, Samara Region 446001 (Russian Federation); Institute of Nuclear Fusion, Russian Research Centre Kurchatov Institute, 1, Kurchatov Sq., Moscow 123182 (Russian Federation); Physics Institute, University of Sao Paulo, Cidade Universitaria, 05508-900, Sao Paulo, Brazil and Brazilian Center for Physics Research, Rua Xavier Sigaud, 150, 22290-180, Rio de Janeiro (Brazil)

2008-01-15T23:59:59.000Z

177

Applications of high-speed dust injection to magnetic fusion  

SciTech Connect (OSTI)

It is now an established fact that a significant amount of dust is produced in magnetic fusion devices due to plasma-wall interactions. Dust inventory must be controlled, in particular for the next-generation steady-state fusion machines like ITER, as it can pose significant safety hazards and degrade performance. Safety concerns are due to tritium retention, dust radioactivity, toxicity, and flammability. Performance concerns include high-Z impurities carried by dust to the fusion core that can reduce plasma temperature and may even induce sudden termination of the plasma. We have recognized that dust transport, dust-plasma interactions in magnetic fusion devices can be effectively studied experimentally by injection of dust with known properties into fusion plasmas. Other applications of injected dust include diagnosis of fusion plasmas and edge localized mode (ELM)'s pacing. In diagnostic applications, dust can be regarded as a source of transient neutrals before complete ionization. ELM's pacing is a promising scheme to prevent disruptions and type I ELM's that can cause catastrophic damage to fusion machines. Different implementation schemes are available depending on applications of dust injection. One of the simplest dust injection schemes is through gravitational acceleration of dust in vacuum. Experiments at Los Alamos and Princeton will be described, both of which use piezoelectric shakers to deliver dust to plasma. In Princeton experiments, spherical particles (40 micron) have been dropped in a systematic and reproducible manner using a computer-controlled piezoelectric bending actuator operating at an acoustic (0,2) resonance. The circular actuator was constructed with a 2.5 mm diameter central hole. At resonance ({approx} 2 kHz) an applied sinusoidal voltage has been used to control the flux of particles exiting the hole. A simple screw throttle located {approx}1mm above the hole has been used to set the magnitude of the flux achieved for a given voltage. Particle fluxes ranging from a few tens of particle per second up to thousands of particles per second have been achieved using this simple device. To achieve higher dust injection speed, another key consideration is how to accelerate dust at controlled amount. In addition to gravity, other possible acceleration mechanisms include electrostatic, electromagnetic, gas-dragged, plasma-dragged, and laser-ablation-based acceleration. Features and limitations of the different acceleration methods will be discussed. We will also describe laboratory experiments on dust acceleration.

Wang, Zhehui [Los Alamos National Laboratory; Li, Yangfang [Max Planck Institute for Extraterrestrial Physics, Germany

2012-08-08T23:59:59.000Z

178

Research on Characteristic Parameters of Coal-dust Explosion  

Science Journals Connector (OSTI)

The parameters of explosive characteristics of the coal-dust are assessed systematically with the test device of minimum ignition temperature of dust clouds and 20L sphere explosion test units. The minimum ignition temperature of dust is a main safety index when handling combustible dusts in industrial production, and while hazard evaluation, the maximum explosion pressure and the explosion index are key parameters. Five kinds of coal-dust with different particle diameters were tested in order to determine the temperature sensitivity and the ferocity under the given conditions, which can be used as the criteria to classify dust explosion hazards. The experiment results indicate that the minimum ignition temperature of coal-dust cloud reduces with the decrease of particle diameter under temperature of (293±5) K and powder spraying pressure of 0.08MPa, and when the particle size reduces to (25-48) ?m, the minimum ignition temperature is between (793-803)K; Besides that, the results can also show that minimum explosive concentration of coal-dust cloud is between 20 gám-3 and 30 gám-3under temperature of (293±5) K, powder spraying pressure of 2MPa and ignition energy of 10kJ, the maximum explosion pressure is 0.45MPa and the maximum explosion index is 11.14 MPaámás-1, which classifies coal-dust explosion hazards to Level I. The conclusions drawn from the experimental results are of great significance to the safe application of these combustible substances.

Weiguo Cao; Liyuan Huang; Jianxin Zhang; Sen Xu; Shanshan Qiu; Feng Pan

2012-01-01T23:59:59.000Z

179

Space Dust Analysis Could Provide Clues to Solar System Origins  

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

of oxygen. Isotope analysis could help confirm that the dust originated outside the solar system, but it's a process that would destroy the precious samples. For now,...

180

Ly-alpha emission from GRB host galaxies  

E-Print Network [OSTI]

Ly-alpha emission is indicative of on-going star formation in a dust-poor environment. Ly-alpha imaging is therefore a probe of the star formation rate and of the dust-content of Gamma-Ray Burst host galaxies. Both of these parameters are central to our understanding of GRB progenitors and of how the environments affect the propagation of afterglow emission out of host galaxies. We have started a program aimed at imaging high redshift (z>2) host galaxies of GRBs at the Ly-alpha resonance line from neutral hydrogen. Here were report the results from imaging of the fields of GRB 000301C and GRB 000926 and outline upcoming observations of further hosts.

J. P. U. Fynbo; P. Moller; B. Thomsen; J. Hjorth; J. Gorosabel; M. I. Andersen; M. P. Egholm; S. Holland; B. L Jensen; H. Pedersen; M. Weidinger

2003-01-13T23:59:59.000Z

Note: This page contains sample records for the topic "fugitive dust emissions" 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

Observations of the inner coma of C/1995O1 (Hale–Bopp)—gas and dust production  

Science Journals Connector (OSTI)

Hale–Bopp (C/1995 O1) was the most productive recent comet observed in terms of gas and dust output. Since its discovery in 1995 at a distance of 7.14 AU from the Sun, the comet has been well observed, revealing the dynamics of a rare and large comet. Hale–Bopp showed strong emissions of the principle cometary gases CN, C3, and C2, as well as an abundance of dust. The production rates of these gases were found to be 1.45 × 10 28 , 1.71 × 10 28 , and 3.52 × 10 28 molecules s - 1 , respectively, with dust production, in terms of A f ? , 1.36 × 10 6 cm , as measured in the green continuum (5260 Å). The observations for this paper are presented in two groups spanning 10 days each, one group centered near 32 days prior to and the other 21 days after perihelion. The averages of dust and gas production rates show a slightly higher value for each prior to perihelion than after perihelion, consistent with a possible peak in production a few weeks prior to perihelion passage.

Brian M. Cudnik

2005-01-01T23:59:59.000Z

182

UNUSUAL CARBONACEOUS DUST DISTRIBUTION IN PN G095.2+00.7  

SciTech Connect (OSTI)

We investigate the polycyclic aromatic hydrocarbon (PAH) features in the young Galactic planetary nebula PN G095.2+00.7 based on mid-infrared observations. The near- to mid-infrared spectra obtained with the AKARI/IRC and the Spitzer/IRS show the PAH features as well as the broad emission feature at 12 {mu}m usually seen in proto-planetary nebulae (pPNe). The spatially resolved spectra obtained with Subaru/COMICS suggest that the broad emission around 12 {mu}m is distributed in a shell-like structure, but the unidentified infrared band at 11.3 {mu}m is selectively enhanced at the southern part of the nebula. The variation can be explained by a difference in the amount of the UV radiation to excite PAHs, and does not necessarily require the chemical processing of dust grains and PAHs. It suggests that the UV self-extinction is important to understand the mid-infrared spectral features. We propose a mechanism which accounts for the evolutionary sequence of the mid-infrared dust features seen in a transition from pPNe to PNe.

Ohsawa, Ryou; Onaka, Takashi; Sakon, Itsuki; Mori, Tamami I. [Department of Astronomy, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan); Miyata, Takashi; Asano, Kentaro [Institute of Astronomy, University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015 (Japan); Matsuura, Mikako [Department of Physics and Astronomy, University College London, Kathleen Lonsdale Building, Gower Place, London WC1E 6BT (United Kingdom); Kaneda, Hidehiro, E-mail: ohsawa@astron.s.u-tokyo.ac.jp [Division of Particle and Astrophysical Sciences, G. Nagoya University, Chikusa-ku, Furo-cho, Nagoya 464-8602 (Japan)

2012-12-01T23:59:59.000Z

183

High-Latitude Dust Over the North Atlantic: Inputs from Icelandic Proglacial Dust Storms  

Science Journals Connector (OSTI)

...agustsson H. Olafsson H. , Forecasting wind gusts in complex terrain . Meteorol. Atmos...composition of African dust measured in trade wind aerosols at Barbados and Miami...version of this article illus. incl. sketch maps United States 201225 10.1126/science...

Joseph M. Prospero; Joanna E. Bullard; Richard Hodgkins

2012-03-02T23:59:59.000Z

184

Effects of dust size distribution on dust negative ion acoustic solitary waves in a magnetized dusty plasma  

SciTech Connect (OSTI)

Dust negative ion acoustic solitary waves in a magnetized multi-ion dusty plasma containing hot isothermal electron, ions (light positive ions and heavy negative ions) and extremely massive charge fluctuating dust grains are investigated by employing the reductive perturbation method. How the dust size distribution affect the height and the thickness of the nonlinear solitary wave are given. It is noted that the characteristic of the solitary waves are different with the different dust size distribution. The magnitude of the external magnetic field also affects the solitary wave form.

Ma, Yi-Rong; Qi, Xin; Sun, Jian-An; Duan, Wen-Shan [Joint Laboratory of Atomic and Molecular Physics of NWNU and IMP CAS, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China and College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070 (China)] [Joint Laboratory of Atomic and Molecular Physics of NWNU and IMP CAS, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China and College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070 (China); Yang, Lei [Joint Laboratory of Atomic and Molecular Physics of NWNU and IMP CAS, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China and College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070 (China) [Joint Laboratory of Atomic and Molecular Physics of NWNU and IMP CAS, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China and College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070 (China); Department of Physics, Lanzhou University, Lanzhou 730000 (China)

2013-08-15T23:59:59.000Z

185

Radiative Effects of Dust Aerosols, Natural Cirrus Clouds and Contrails: Broadband Optical Properties and Sensitivity Studies  

E-Print Network [OSTI]

This dissertation aims to study the broadband optical properties and radiative effects of dust aerosols and ice clouds. It covers three main topics: the uncertainty of dust optical properties and radiative effects from the dust particle shape...

Yi, Bingqi

2013-07-09T23:59:59.000Z

186

Dust resuspension as a contaminant source and transport pathway  

SciTech Connect (OSTI)

Numerous environmental contaminants sorb to dust particles or exist as particles, including metals, hydrophobic organic compounds, asbestos, pollens, and microbial pathogens. Wind resuspension of dust and other particulate matter provides a dust source for the atmosphere and a contaminant transport pathway. Not only do these materials pose a risk to human health, but also, resuspended dust particles are believed to play a role in global climate change and chemical reactions in the atmosphere. The conditions under which contaminated sites are vulnerable to wind resuspension are not generally known, as the basic physics of the problem are poorly understood. Field data show tremendous variability. Conventional dust flux models assume that dust resuspension occurs only for high winds and then only temporarily, with a transient dust flux occurring only when the bed is first exposed to the high wind. The surface is then assumed to stabilize such that no further dust moves until the surface is disturbed or a higher wind occurs. Recent wind tunnel experiments demonstrate that surfaces yield continuous steady dust fluxes under steady wind conditions well beyond the initial high transient flux, even when no erosion is visible and the velocity is below the predicted threshold velocity for movement. This average steady-state dust flux increases with average wind speed. Ongoing work is investigating the influence of air relative humidity on these processes. Contaminant resuspension models capture trends only and fail to predict sporadic high flux events that may control doses. Successful modeling of contaminant resuspension will depend on development of better dust flux predictions. Risk analyses require better predictive modeling, necessitating a deeper understanding of the underlying phenomena.

Loosmore, G.A,; Hunt, J.R.

1999-07-01T23:59:59.000Z

187

DUST-DRIVEN WIND FROM DISK GALAXIES  

SciTech Connect (OSTI)

We study gaseous outflows from disk galaxies driven by radiation pressure on dust grains. We include the effect of bulge and dark matter halo and show that the existence of such an outflow implies a maximum value of disk mass-to-light ratio. We show that the terminal wind speed is proportional to the disk rotation speed in the limit of a cold gaseous outflow, and that in general there is a contribution from the gas sound speed. Using the mean opacity of dust grains and the evolution of the luminosity of a simple stellar population, we then show that the ratio of the wind terminal speed (v{sub {infinity}}) to the galaxy rotation speed (v{sub c}) ranges between 2 and 3 for a period of {approx}10 Myr after a burst of star formation, after which it rapidly decays. This result is independent of any free parameter and depends only on the luminosity of the stellar population and the relation between disk and dark matter halo parameters. We briefly discuss the possible implications of our results.

Sharma, Mahavir; Nath, Biman B. [Raman Research Institute, Sadashiva Nagar, Bangalore 560080 (India); Shchekinov, Yuri, E-mail: mahavir@rri.res.in, E-mail: biman@rri.res.in, E-mail: yus@sfedu.ru [Department of Physics, Southern Federal University, Rostov on Don 344090 (Russian Federation)

2011-08-01T23:59:59.000Z

188

Managing Nuisance Odor and Dust from Poultry Growing Operations  

E-Print Network [OSTI]

The odor and dust from poultry growing operations can be a nuisance to neighbors. The tips for managing odor and dust contained in this leaflet cover the disposal of dead birds, maintenance of the ventilation system, composting and storing of litter...

Mukhtar, Saqib; Lacey, Ron; Carey, John B.

2001-08-08T23:59:59.000Z

189

APS/123-QED Dust Successive Generations in Complex Plasmas  

E-Print Network [OSTI]

distribution at the entrance of the plasma zone. It is connected to a 13.56 MHz rf gener- ator throughAPS/123-QED Dust Successive Generations in Complex Plasmas: A Cyclic Phenomenon in the Void Region´eans cedex 2, France (Dated: December 5, 2007) Dust formation and growth in plasmas are in most cases

Boyer, Edmond

190

HIGH FIDELITY STUDIES OF INTERSTELLAR DUST ANALOGUE IMPACTS IN STARDUST  

E-Print Network [OSTI]

HIGH FIDELITY STUDIES OF INTERSTELLAR DUST ANALOGUE IMPACTS IN STARDUST AEROGEL AND FOILS F://www.ssl.berkeley.edu/~westphal/ISPE/. In 2000 and 2002 the Stardust Mission exposed aerogel collector panels for a total of about 200 days/s] interstellar dust (ISD) analogues onto Stardust aerogel and foil flight spares. Particle impact speeds up to 50

191

Constraining oceanic dust deposition using surface ocean dissolved Al  

E-Print Network [OSTI]

Constraining oceanic dust deposition using surface ocean dissolved Al Qin Han,1 J. Keith Moore,1; accepted 7 December 2007; published 12 April 2008. [1] We use measurements of ocean surface dissolved Al (DEAD) model to constrain dust deposition to the oceans. Our Al database contains all available

Zender, Charles

192

Online Supplement S1.0 Dust/Climate Interactions  

E-Print Network [OSTI]

by changing the energy balance of solar and thermal radiation [IPCC, 2001]. Dust scatters and also partly absorbs incoming solar radiation, and it also absorbs and re-emits outgoing longwave radiation. Any as the possibility of intensification of easterly waves in North Africa from dust [Jones, et al., 2004]. On the other

Mahowald, Natalie

193

Continuous particulate monitoring for emission control  

SciTech Connect (OSTI)

An optical continuous particle monitoring system has been developed to overcome common problems associated with emissions monitoring equipment. Opacity monitors generally use a single- or double-pass system to analyze the presence of dust particles in the flue gas stream. The particles scatter and absorb light as it passes through the stack. As the particle content in the gas stream increases due to bag failure or some other problem, the amount of light that is blocked also increases. The opacity monitor compares the amount of lost light energy to the total energy of the light available and translates the signal to percentage of opacity. Opacity monitors are typically installed to meet the requirements set forth by pollution control agencies. Most opacity monitors are designed to meet all of the requirements of the Environmental Protection Agency (EPA) 40 CFR, Part 60, Appendix B, Performance Specification. The new continuous particle monitor (CPM) increases the accuracy of emission monitoring and overcomes typical problems found in conventional emission monitoring devices. The CPM is an optically based, calibratible, continuous dust monitor that uses a microprocessor, transmitter head, and receiver head. When calibrated with an isokinetic sample, a continuous readout of particulate concentration (in mg/m[sup 3]) in the exhaust gas is provided. The system can be used as a filter bag failure system or a long-term emission trend analyzer. Formal testing was conducted to evaluate the effectiveness of the optically based CPM. The monitor was calibrated using particles of a range of compositions, size distributions, and concentrations. The feasibility of using the instrument to measure particle concentration as low as 10 mg/m[sup 3] was examined.

Bock, A.H. (BHA Group, Inc., Kansas City, MO (United States))

1993-08-01T23:59:59.000Z

194

Grain quality impacts of prohibiting recombination recirculation dust at export grain elevators  

E-Print Network [OSTI]

. . . 58 Figure A9 ? PSD OF BIN CORN DUST FROM ELEVATOR 7. Figure A10 - PSD OF R/R CORN DUST FROM ELEVATOR 7. Figure A11 - PSD OF INBOUND WHEAT FOR ELEVATOR 5. Figure A12 ? PSD OF OUTBOUND WHEAT FOR ELEVATOR 5. . . . Figure A13 - PSD OF MIXED BIN DUST... the mesh. TABLE 3, MASS FRACTION OF CORN DUSTS LESS THAN 100 MICRONS DETERMINED BY WET SIEVING. Sample % less than 100 mierons Elev 3 R/R Dust Elev 4 Bin Dust Elev 7 Bin Dust Elev 7 R/R Dust 61. 215. 4 32. 3 E 1. 5 59. 0+1. 4 90. 6 10. 9 22...

Spillmann, Daryl Drew

2012-06-07T23:59:59.000Z

195

Sheath formation under collisional conditions in presence of dust  

SciTech Connect (OSTI)

Sheath formation is studied for collisional plasma in presence of dust. In common laboratory plasma, the dust acquires negative charges because of high thermal velocity of the electrons. The usual dust charging theory dealing with the issue is that of the Orbit Motion Limited theory. However, the theory does not find its application when the ion neutral collisions are significantly present. An alternate theory exists in literature for collisional dust charging. Collision is modeled by constant mean free path model. The sheath is considered jointly with the bulk of the plasma and a smooth transition of the plasma profiles from the bulk to the sheath is obtained. The various plasma profiles such as the electrostatic force on the grain, the ion drag force along with the dust density, and velocity are shown to vary spatially with increasing ion neutral collision.

Moulick, R., E-mail: rakesh.moulick@gmail.com; Goswami, K. S. [Centre of Plasma Physics-Institute for Plasma Research, Sonapur-782402, Guwahati (India)

2014-08-15T23:59:59.000Z

196

Quantification of Black Carbon and Other Pollutant Emissions from a  

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

Quantification of Black Carbon and Other Pollutant Emissions from a Quantification of Black Carbon and Other Pollutant Emissions from a Traditional and an Improved Cookstove Title Quantification of Black Carbon and Other Pollutant Emissions from a Traditional and an Improved Cookstove Publication Type Report LBNL Report Number LBNL-6062E Year of Publication 2010 Authors Kirchstetter, Thomas W., Chelsea Preble, Odelle L. Hadley, and Ashok J. Gadgil Keywords aethalometer, Berkeley Darfur Stove, black carbon, carbon monoxide, climate change, DustTrak, global warming, improved cookstoves, indoor air quality, LBNL Stove Testing Facility, particulate matter, photoacoustic absorption spectrometer, pollutant emission factor, three-stone fire Abstract Traditional methods of cooking in developing regions of the world emit pollutants that

197

THE S{sup 4}G PERSPECTIVE ON CIRCUMSTELLAR DUST EXTINCTION OF ASYMPTOTIC GIANT BRANCH STARS IN M100  

SciTech Connect (OSTI)

We examine the effect of circumstellar dust extinction on the near-IR (NIR) contribution of asymptotic giant branch (AGB) stars in intermediate-age clusters throughout the disk of M100. For our sample of 17 AGB-dominated clusters we extract optical-to-mid-IR spectral energy distributions (SEDs) and find that NIR brightness is coupled to the mid-IR dust emission in such a way that a significant reduction of AGB light, of up to 1 mag in the K band, follows from extinction by the dust shell formed during this stage. Since the dust optical depth varies with AGB chemistry (C-rich or O-rich), our results suggest that the contribution of AGB stars to the flux from their host clusters will be closely linked to the metallicity and the progenitor mass of the AGB star, to which dust chemistry and mass-loss rate are sensitive. Our sample of clusters-each the analogue of a {approx}1 Gyr old post-starburst galaxy-has implications within the context of mass and age estimation via SED modeling at high-z: we find that the average {approx}0.5 mag extinction estimated here may be sufficient to reduce the AGB contribution in the (rest-frame) K band from {approx}70%, as predicted in the latest generation of synthesis models, to {approx}35%. Our technique for selecting AGB-dominated clusters in nearby galaxies promises to be effective for discriminating the uncertainties associated with AGB stars in intermediate-age populations that plague age and mass estimation in high-z galaxies.

Meidt, Sharon E.; Schinnerer, Eva [Max-Planck-Institut fuer Astronomie/Koenigstuhl 17, D-69117 Heidelberg (Germany); Munoz-Mateos, Juan-Carlos; Kim, Taehyun [National Radio Astronomy Observatory, Charlottesville, VA (United States); Holwerda, Benne [European Space Agency, ESTEC, Keplerlaan 1, 2200 AG, Noordwijk (Netherlands); Ho, Luis C.; Madore, Barry F.; Sheth, Kartik; Menendez-Delmestre, Karin; Seibert, Mark [The Observatories of the Carnegie Institution for Science, Pasadena, CA (United States); Knapen, Johan H. [Instituto de Astrofisica de Canarias, Tenerife (Spain); Bosma, Albert; Athanassoula, E. [Laboratoire d'Astrophysique de Marseille (LAM), Marseille (France); Hinz, Joannah L. [Department of Astronomy, University of Arizona, Tucson, AZ (United States); Regan, Michael [Space Telescope Science Institute, Baltimore, MD (United States); De Paz, Armando Gil [Departamento de Astrofisica, Universidad Complutense Madrid, Madrid (Spain); Mizusawa, Trisha [Spitzer Science Center, Pasadena, CA (United States); Gadotti, Dimitri A. [European Southern Observatory, Santiago (Chile); Laurikainen, Eija; Salo, Heikki [Astronomy Division, Department of Physical Sciences, University of Oulu, Oulu (Finland); and others

2012-04-01T23:59:59.000Z

198

EIA - Greenhouse Gas Emissions - Nitrous Oxide Emissions  

Gasoline and Diesel Fuel Update (EIA)

4. Nitrous Oxide Emissions 4. Nitrous Oxide Emissions 4.1 Total emissions U.S. nitrous oxide emissions in 2009 were 4 MMTCO2e (1.7 percent) below their 2008 total (Table 22). Sources of U.S. nitrous oxide emissions include agriculture, energy use, industrial processes, and waste management (Figure 22). The largest source is agriculture (73 percent), and the majority of agricultural emissions result from nitrogen fertilization of agricultural soils (87 percent of the agriculture total) and management of animal waste (13 percent). U.S. nitrous oxide emissions rose from 1990 to 1994, fell from 1994 to 2002, and returned to an upward trajectory from 2003 to 2007, largely as a result of increased use of synthetic fertilizers. Fertilizers are the primary contributor of emissions from nitrogen fertilization of soils, which grew by more than 30 percent from

199

Chemically Consistent Evolutionary Models with Dust  

E-Print Network [OSTI]

As a tool to interpret nearby and high redshift galaxy data from optical to K-band we present our chemically consistent spectrophotometric evolutionary synthesis models. These models take into account the increasing initial metallicity of successive stellar generations using recently published metallicity dependent stellar evolutionary tracks, stellar yields and model atmosphere spectra. The influence of the metallicity is analysed. Dust absorption is included on the basis of gas content and abundance as it varies with time and galaxy type. We compare our models with IUE template spectra and are able to predict UV fluxes for different spectral types. Combined with a cosmological model we obtain evolutionary and k-corrections for various galaxy types and show the differences to models using only solar metallicity input physics as a function of redshift, wavelength band and galaxy type.

C. S. Möller; U. Fritze-v. Alvensleben; K. J. Fricke; D. Calzetti

1999-06-21T23:59:59.000Z

200

Stabilization of the Shear Instability in a Dust Layer of a Protoplanetary Disk and Possible Formation of Planetesimals due to Gravitational Fragmentation of the Dust Layer  

E-Print Network [OSTI]

We show that the planetesimal formation due to the gravitational fragmentation of a dust layer in a protoplanetary disk is possible. The dust density distribution in the dust layer would approach the constant Richardson number distribution due to the dust stirring by the shear instability and dust settling. We perform the analysis of the shear instability of dust layer in a protoplanetary disk with the constant Richardson number density distribution. Our study revealed that this distribution is stable against the shear instability even if the dust density at the midplane reaches the critical density of the gravitational instability, and the planetesimal formation through the gravitational fragmentation of the dust layer can occur even for the dust to gas surface density ratio with the solar composition.

Naoki Ishitsu; Minoru Sekiya

2004-06-02T23:59:59.000Z

Note: This page contains sample records for the topic "fugitive dust emissions" 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

Dust tracking techniques applied to the STARDUST facility: First results  

Science Journals Connector (OSTI)

Abstract An important issue related to future nuclear fusion reactors fueled with deuterium and tritium is the creation of large amounts of dust due to several mechanisms (disruptions, \\{ELMs\\} and VDEs). The dust size expected in nuclear fusion experiments (such as ITER) is in the order of microns (between 0.1 and 1000 ?m). Almost the total amount of this dust remains in the vacuum vessel (VV). This radiological dust can re-suspend in case of LOVA (loss of vacuum accident) and these phenomena can cause explosions and serious damages to the health of the operators and to the integrity of the device. The authors have developed a facility, STARDUST, in order to reproduce the thermo fluid-dynamic conditions comparable to those expected inside the VV of the next generation of experiments such as ITER in case of LOVA. The dust used inside the STARDUST facility presents particle sizes and physical characteristics comparable with those that created inside the VV of nuclear fusion experiments. In this facility an experimental campaign has been conducted with the purpose of tracking the dust re-suspended at low pressurization rates (comparable to those expected in case of LOVA in ITER and suggested by the General Safety and Security Report ITER-GSSR) using a fast camera with a frame rate from 1000 to 10,000 images per second. The velocity fields of the mobilized dust are derived from the imaging of a two-dimensional slice of the flow illuminated by optically adapted laser beam. The aim of this work is to demonstrate the possibility of dust tracking by means of image processing with the objective of determining the velocity field values of dust re-suspended during a LOVA.

A. Malizia; M. Camplani; M. Gelfusa; I. Lupelli; M. Richetta; L. Antonelli; F. Conetta; D. Scarpellini; M. Carestia; E. Peluso; C. Bellecci; L. Salgado; P. Gaudio

2014-01-01T23:59:59.000Z

202

Vehicle Emissions Review - 2011  

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

Emissions Review - 2011 (so far) Tim Johnson October 4, 2011 DOE DEER Conference, Detroit JohnsonTV@Corning.com 2 Summary * California LD criteria emission regs are tightening....

203

Shape-induced gravitational sorting of Saharan dust during transatlantic voyage: Evidence from CALIOP  

E-Print Network [OSTI]

Shape-induced gravitational sorting of Saharan dust during transatlantic voyage: Evidence from of Saharan dust from June to August 2007. Observing along a typical transatlantic dust track, we find that (1 of Saharan dust during transatlantic voyage: Evidence from CALIOP lidar depolarization measurements, Geophys

Kostinski, Alex

204

EIA - Greenhouse Gas Emissions - Carbon Dioxide Emissions  

Gasoline and Diesel Fuel Update (EIA)

2. Carbon Dioxide Emissions 2. Carbon Dioxide Emissions 2.1. Total carbon dioxide emissions Annual U.S. carbon dioxide emissions fell by 419 million metric tons in 2009 (7.1 percent), to 5,447 million metric tons (Figure 9 and Table 6). The annual decrease-the largest over the 19-year period beginning with the 1990 baseline-puts 2009 emissions 608 million metric tons below the 2005 level, which is the Obama Administration's benchmark year for its goal of reducing U.S. emissions by 17 percent by 2020. The key factors contributing to the decrease in carbon dioxide emissions in 2009 included an economy in recession with a decrease in gross domestic product of 2.6 percent, a decrease in the energy intensity of the economy of 2.2 percent, and a decrease in the carbon intensity of energy supply of

205

Dust suppression characteristics of mineral oil when applied to corn, wheat, or soybeans  

E-Print Network [OSTI]

). . . . . . . Percent of Dust Less Than 10 um (PLT10). . Percent of Dust Less Than 16 um (PLT16). . Mass of Dust Less Than 10 pr1 (NLT10). . Mass of Dust Less Than 16 qm (MLT16). . Retention Curves (RC). SUMMARY AND CONCLUSIONS. FUTURE RESEARCH. REFERENCES... OF THEIR RESPECTIVE GRAIN KERNELS. . SUMMARY OF THE MEAN PERCENT OF DUST LESS THAN 10 um (PLT10) VALUES OF CORN, WHEAT, AND SOYBEAN DUSTS ADHERING TO THE SURFACES OF THEIR RESPECTIVE GRAIN KERNELS. SUMMARY OF THE MEAN PERCENT OF DUST LESS THAN 16 um (PLT16...

Jones, David Don

2012-06-07T23:59:59.000Z

206

Enforcing Emissions Trading when Emissions Permits are Bankable  

Science Journals Connector (OSTI)

We propose enforcement strategies for emissions trading programs with bankable emissions permits that guarantee...

John K. Stranlund; Christopher Costello…

2005-09-01T23:59:59.000Z

207

Magnetic signature of indoor air pollution: Household dust study  

Science Journals Connector (OSTI)

The combination of magnetic and geochemical methods was used to determine the mineralogy, grain size and domain structure of magnetic particles in indoor dust collected in 195 sites in Warsaw, Poland. Data sho...

Beata Górka-Kostrubiec; Maria Jele?ska; El?bieta Król

2014-12-01T23:59:59.000Z

208

Modelling Gas And Dust Release From Comet Hale–Bopp  

Science Journals Connector (OSTI)

Numerical simulations of the evolving activity of comet Hale-Bopp are presented, assuming a porous, ... km in radius, made of dust and gas-laden amorphous ice. The main effects included ... crystallization of amo...

D. Prialnik

209

Modeling Dust Jets And Shells From Comet Hale-Bopp  

Science Journals Connector (OSTI)

Persistent jet and shell structures from comet Hale-Bopp showing gradual changes in the shapes ... declination. Lower limits on the dust and gas production rates at various epochs are presented.

R. Vasundhara; Pavan Chakraborty; Andreas Hänel; Erwin Heiser

210

Global trends in visibility: implications for dust sources  

E-Print Network [OSTI]

There is a large uncertainty in the relative roles of human land use, climate change and carbon dioxide fertilization in changing desert dust source strength over the past 100 years, and the overall sign of human impacts ...

Mahowald, N. M.; Ballantine, J.A.; Feddema, Johannes J.; Ramankutty, N.

2007-06-01T23:59:59.000Z

211

Pollen analysis of dust preserved in four medieval books  

Science Journals Connector (OSTI)

Pollen spectra of three samples of dust taken from four medieval books are reported. The books, printed A.D. 1500–1530, were preserved in the Franciscan monastery of Kada? (NW Bohemia) up to c. 30 years ago, a...

Vlasta Jankovská

1995-03-01T23:59:59.000Z

212

TRIGGERED STAR FORMATION AND DUST AROUND MID-INFRARED-IDENTIFIED BUBBLES  

SciTech Connect (OSTI)

We use Two Micron All Sky Survey, GLIMPSE, and MIPSGAL survey data to analyze the young stellar object (YSO) and warm dust distribution around several mid-infrared-identified bubbles. We identify YSOs using J-band to 8 {mu}m photometry and correlate their distribution relative to the photodissociation region (PDR; as traced by diffuse 8 {mu}m emission), which we assume to be associated with and surrounding an H II region. We find that only 20% of the sample H II regions appear to have a significant number of YSOs associated with their PDRs, implying that triggered star formation mechanisms acting on the boundary of the expanding H II region do not dominate in this sample. We also measure the temperature of dust inside 20 H II regions using 24 {mu}m and 70 {mu}m MIPSGAL images. In eight circularly symmetric sources, we analyze the temperature distribution and find shallower temperature gradients than predicted by an analytic model. Possible explanations of this shallow temperature gradient are a radially dependent grain-size distribution and/or non-equilibrium radiative processes.

Watson, C.; Mengistu, A. [Department of Physics, Manchester College, 604 East College Avenue, North Manchester, IN 46962 (United States); Hanspal, U. [Ross University School of Medicine, 630 US Highway 1, North Brunswick, NJ 08902 (United States)

2010-06-20T23:59:59.000Z

213

Photochemical Oxidant Processes in the Presence of Dust: An Evaluation of the Impact of Dust on Particulate Nitrate and Ozone Formation  

Science Journals Connector (OSTI)

The influence of dust on the tropospheric photochemical oxidant cycle is studied through the use of a detailed coupled aerosol and gas-phase chemistry model. Dust is a significant component of the troposphere throughout Asia and provides a ...

Yang Zhang; Young Sunwoo; Veerabhadra Kotamarthi; Gregory R. Carmichael

1994-07-01T23:59:59.000Z

214

Alignment of Dust in Molecular Clouds  

E-Print Network [OSTI]

Polarimetry is one of the most informative techniques of studying magnetic fields in molecular clouds. How reliable the interpretation of the polarization maps in terms of magnetic fields is the issue that the grain alignment theory addresses. We show that grain alignment involves several processes acting simultaneously, but on different time-scales. We explain that rotating dust grains get substantial magnetic moment that allows them precess fast about magnetic field lines. As the result, grains preserve their orientation to magnetic field when the magnetic field direction fluctuates. We point out to the importance of internal alignment, i.e. the process forces grain axes to be aligned in respect to the grain angular momentum. We show that subtle quantum effects, in particular relaxation related to nuclear magnetic moments of atoms composing the grain, brings to live complex grain motions, e.g. flips. These flips substantially alter the dynamics of grain and limit the applicability of earlier theories that did not account for them. We also briefly review basic physical processes involved in the alignment of grain angular momentum in respect to interstellar magnetic field. We claim that the bulk of existing observational data is consistent with the radiative torque alignment mechanism. In particular, we show that large grains that are known to exist in the cores of molecular clouds may be aligned by the attenuated external interstellar radiation field.

A. Lazarian; J. Cho

2004-08-10T23:59:59.000Z

215

1012 IEEE TRANSACTIONS ON PLASMA SCIENCE, VOL. 36, NO. 4, AUGUST 2008 Plasma Emission Modifications and Instabilities  

E-Print Network [OSTI]

tails or planetary atmospheres. In artificial plasmas, these dust particles are fatal for processes a polymer layer exposed to a low-pressure radio- frequency (13.56 MHz) argon plasma. The capacitively1012 IEEE TRANSACTIONS ON PLASMA SCIENCE, VOL. 36, NO. 4, AUGUST 2008 Plasma Emission Modifications

Paris-Sud XI, Université de

216

Emission of non-thermal microwave radiation by a Martian dust storm Christopher Ruf,1  

E-Print Network [OSTI]

of the lowest three modes of the Martian Schumann Resonance (SR). The SR results from electromagnetic standing

Ruf, Christopher

217

Dust emissions from undisturbed and disturbed, crusted playa surfaces: Cattle trampling effects  

E-Print Network [OSTI]

in the far northern Chihuahua Desert. The natural, undisturbed crust and its subjection to two levels

218

AN IMPRINT OF MOLECULAR CLOUD MAGNETIZATION IN THE MORPHOLOGY OF THE DUST POLARIZED EMISSION  

SciTech Connect (OSTI)

We describe a morphological imprint of magnetization found when considering the relative orientation of the magnetic field direction with respect to the density structures in simulated turbulent molecular clouds. This imprint was found using the Histogram of Relative Orientations (HRO), a new technique that utilizes the gradient to characterize the directionality of density and column density structures on multiple scales. We present results of the HRO analysis in three models of molecular clouds in which the initial magnetic field strength is varied, but an identical initial turbulent velocity field is introduced, which subsequently decays. The HRO analysis was applied to the simulated data cubes and mock-observations of the simulations produced by integrating the data cube along particular lines of sight. In the three-dimensional analysis we describe the relative orientation of the magnetic field B with respect to the density structures, showing that: (1) the magnetic field shows a preferential orientation parallel to most of the density structures in the three simulated cubes, (2) the relative orientation changes from parallel to perpendicular in regions with density over a critical density n{sub T} in the highest magnetization case, and (3) the change of relative orientation is largest for the highest magnetization and decreases in lower magnetization cases. This change in the relative orientation is also present in the projected maps. In conjunction with simulations, HROs can be used to establish a link between the observed morphology in polarization maps and the physics included in simulations of molecular clouds.

Soler, J. D.; Netterfield, C. B.; Fissel, L. M. [Department of Astronomy and Astrophysics, University of Toronto, Toronto, ON M5S 3H4 (Canada); Hennebelle, P. [Laboratoire de Radioastronomie, Ecole Normale Superiure and Observatoire de Paris, UMR CNRS 8112. 24 rue Lhomond F-75231 Paris Cedex 05 (France); Martin, P. G.; Miville-Deschenes, M.-A., E-mail: soler@astro.utoronto.ca [Canadian Institute for Theoretical Astrophysics, University of Toronto, 60 St. George Street, Toronto, ON M5S 3H8 (Canada)

2013-09-10T23:59:59.000Z

219

Annual Greenhouse Gas and Sustainability Data Report | Department...  

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

agency-aggregated data necessary for calculating scope 1, 2, and 3 greenhouse gas (GHG) emissions in the commonly used, native units of energy consumption and fugitive...

220

Oil & Gas Research | netl.doe.gov  

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

potential risks associated with oil and gas resources in shale reservoirs that require hydraulic fracturing or other engineering measures to produce. Fugitive Emissions |...

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


221

The cycling of carbon into and out of dust  

E-Print Network [OSTI]

Observational evidence seems to indicate that the depletion of interstellar carbon into dust shows rather wide variations and that carbon undergoes rather rapid recycling in the interstellar medium (ISM). Small hydrocarbon grains are processed in photo-dissociation regions by UV photons, by ion and electron collisions in interstellar shock waves and by cosmic rays. A significant fraction of hydrocarbon dust must therefore be re-formed by accretion in the dense, molecular ISM. A new dust model (Jones et al., Astron. Astrophys., 2013, 558, A62) shows that variations in the dust observables in the diffuse interstellar medium (nH = 1000 cm^3), can be explained by systematic and environmentally-driven changes in the small hydrocarbon grain population. Here we explore the consequences of gas-phase carbon accretion onto the surfaces of grains in the transition regions between the diffuse ISM and molecular clouds (e.g., Jones, Astron. Astrophys., 2013, 555, A39). We find that significant carbonaceous dust re-processi...

Jones, Anthony P; Koehler, Melanie; Fanciullo, Lapo; Bocchio, Marco; Micelotta, Elisabetta; Verstraete, Laurent; Guillet, Vincent

2014-01-01T23:59:59.000Z

222

ADVANCES IN DUST DETECTION AND REMOVAL FOR TOKAMAKS  

SciTech Connect (OSTI)

Dust diagnostics and removal techniques are vital for the safe operation of next step fusion devices such as ITER. In the tokamak environment, large particles or fi bers can fall on the electrostatic detector potentially causing a permanent short. An electrostatic dust detector developed in the laboratory is being applied to the National Spherical Torus Experiment (NSTX). We report on the development of a gas puff system that uses helium to clear such particles from the detector. Experiments at atmospheric pressure with varying nozzle designs, backing pressures, puff durations and exit fl ow orientations have given an optimal confi guration that effectively removes particles from a 25 cm² area. Similar removal effi ciencies were observed under a vacuum base pressure of 1 mTorr. Dust removal from next step tokamaks will be required to meet regulatory dust limits. A tri-polar grid of fi ne interdigitated traces has been designed that generates an electrostatic traveling wave for conveying dust particles to a “drain.” First trials with only two working electrodes have shown particle motion in optical microscope images.

Campos, A.; Skinner, C.H.

2009-01-01T23:59:59.000Z

223

Rapid?sampling system for dusts and gases  

Science Journals Connector (OSTI)

The Bureau of Mines has developed a system for the rapid grab sampling of heterogeneous mixtures of gases and dusts during the preignition and postignition stages of dust explosions. The combustion chamber in which the explosion occurs is first fitted with a hypodermic sampling needle with its inlet end at the desired sampling point within the chamber and its sharp injecting end protruding outside of the chamber. Rapid sampling (approximately 25 to 50 ms) is achieved with a double?acting air?pressure?actuated cylinder. The forward stroke of the cylinder thrusts the rubber septum seal of an evacuated glass sampling tube onto the protruding needle which punctures the septum filling the tube with gas and dust from the combustion chamber. The return stroke of the cylinder reseals the sampling tube by returning the mechanism to its original position. The initial time of sampling and the duration of sampling are independently variable and controlled by a microprocessor. Results obtained with a trimodal distribution of coal dust show no significant size discrimination at least up to 70 ?m. Data obtained from laboratory?scale coal dust explosion tests are also presented. Such data provide valuable insights into the basic phenomena involved in explosions.

R. S. Conti; M. Hertzberg; F. T. Duda; K. L. Cashdollar

1983-01-01T23:59:59.000Z

224

Beyond Tailpipe Emissions  

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

Beyond Tailpipe Emissions Beyond Tailpipe Emissions Greenhouse Gas Emissions for Electric and Plug-In Hybrid Electric Vehicles Driving your vehicle can yield both greenhouse gas (GHG) emissions from your vehicle's tailpipe and GHG emissions related to the production of the fuel used to power your vehicle. For example, activities associated with fuel production such as feedstock extraction, feedstock transport to a processing plant, and conversion of feedstock to motor fuel, as well as distribution of the motor fuel, can all produce GHG emissions. The Fuel Economy and Environment Label provides a Greenhouse Gas Rating, from 1 (worst) to 10 (best), based on the vehicle's tailpipe carbon dioxide emissions only, and this rating does not reflect any GHG emissions associated with fuel production.

225

Emissions from Ships  

Science Journals Connector (OSTI)

...Turbine and Diesel) Engine Exhaust Emission...of relative fuel consumption. For commercial...Marine Diesel Engine and Gas Turbine...Turbine and Diesel) Engine Exhaust Emission...of relative fuel consumption. For commercial...

James J. Corbett; Paul Fischbeck

1997-10-31T23:59:59.000Z

226

Introduction to Emissions Trading  

Science Journals Connector (OSTI)

This chapter constitutes an introduction to emissions trading. First, we detail the latest developments ... Second, we introduce the main characteristics of emissions trading, be it in terms of spatial and...2 al...

Dr. Julien Chevallier

2012-01-01T23:59:59.000Z

227

Evaluate Greenhouse Gas Emissions Profile  

Broader source: Energy.gov [DOE]

Evaluating a Federal agency's greenhouse gas (GHG) emissions profile means getting a solid understanding of the organization's largest emission categories, largest emission sources, and its potential for improvement.

228

Paducah DUF6 Conversion Facility: Record of Decision: As Published in the Federal Register  

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

54 54 Federal Register / Vol. 69, No. 143 / Tuesday, July 27, 2004 / Notices accordance with the comprehensive set of DOE requirements and applicable regulatory requirements that have been established to protect public health and the environment. These requirements encompass a wide variety of areas, including radiation protection, facility design criteria, fire protection, emergency preparedness and response, and operational safety requirements. * Cylinder management activities will be conducted in accordance with applicable DOE safety and environmental requirements, including the Cylinder Management Plan. * Temporary impacts on air quality from fugitive dust emissions during reconstruction of cylinder yards or construction of any new facility will be controlled by the best available

229

Constraining the structure of the transition disk HD 135344B (SAO 206462) by simultaneous modeling of multi-wavelength gas and dust observations  

E-Print Network [OSTI]

HD 135344B is an accreting (pre-) transition disk which displays emission of warm CO extending tens of AU inside its 30 AU dust cavity. We employ the dust radiative transfer code MCFOST and the thermo-chemical code ProDiMo to derive the disk structure from the simultaneous modeling of the spectral energy distribution (SED), VLT/CRIRES CO P(10) 4.75 micron, Herschel/PACS [O I] 63 micron, Spitzer-IRS, and JCMT 12CO J=3-2 spectra, VLTI/PIONIER H-band visibilities, and constraints from (sub-)mm continuum interferometry and near-IR imaging. We found a disk model able to describe simultaneously the current observations. This disk has the following structure: (1) to reproduce the SED, the near-IR interferometry data, and the CO ro-vibrational emission, refractory grains (we suggest carbon) are present inside the silicate sublimation radius (0.08 100 to account for the 870 micron continuum upper limit and the CO P(10) line flux; (5) the gas/dust ratio at 30

Carmona, A; Thi, W F; Benisty, M; Ménard, F; Grady, C; Kamp, I; Woitke, P; Olofsson, J; Roberge, A; Brittain, S; Dûchene, G; Meeus, G; Martin-Zaïdi, C; Dent, B; Bouquin, J B Le; Berger, J P

2014-01-01T23:59:59.000Z

230

Chemistry and line emission of outer protoplanetary disks  

E-Print Network [OSTI]

The structure and chemistry of protoplanetary disks depends strongly on the nature of the central star around which it has formed. The dust temperature is mainly set by the stellar luminosity, while the chemistry of the upper disk layers depends on the amount of intercepted UV and X-ray flux. We will study the differences in chemistry, thermal sturcture and line emission around Herbig Ae/Be, T Tauri stars and low mass M dwarfs. Predictions will be made for future observations with SOFIA and Herschel.

Inga Kamp; Cornelis P. Dullemond; Michiel Hogerheijde; Jesus Emilio Enriquez

2005-09-21T23:59:59.000Z

231

Regulation of GHG emissions from transportation fuels: Emission quota versus emission intensity standard  

E-Print Network [OSTI]

1 ? ?) and ? respectively. GHG emissions per unit of blend1 ? ?)? i + ?? i Reduction in GHG emissions with respect toSeries Regulation of GHG emissions from transportation 

Rajagopal, Deepak

2010-01-01T23:59:59.000Z

232

Dust size distribution and concentrations with cottonseed oil mills  

E-Print Network [OSTI]

-VOLUME SAMPLES FOR P. S. D OF PARTICLES & 100 um DIAMETER (MMD) ANALYSIS OF VARIANCE ON HIGH-VOLUME SAMPLES FOR P. S. D. OF PARTICLES & 100 um DIAMETER (og) MULTIPLE RANGE TEST FOR MEAN VALUES OF MMD BY AREA MULTIPLE RANGE TEST OF MMD BY MILL PARTICLE SIZE... TEST OF AREA DUST CONCENTRATIONS = 15 Pm IN DIAMETER MULTIPLE RANGE TEST OF MILL DUST CONCENTRATIONS & 15 um IN DIAMETER ANALYSIS OF VARIANCE ON PARTICLE SIZING HEAD SAMPLES OF CONCENTRATIONS FOR PARTICLES & 100 IJBI DIAMETER . . . . 47 47 54...

Wiederhold, Lee Roy

2012-06-07T23:59:59.000Z

233

Dust in the wind: the role of recent mass loss in long gamma-ray bursts  

E-Print Network [OSTI]

We study the late-time (t>0.5 days) X-ray afterglows of nearby (z3) X-ray emission that is inconsistent with forward shock synchrotron radiation associated with the afterglow. These explosions also show larger-than-average intrinsic absorption (NH_x,i >6d21 cm-2) and prompt gamma-ray emission with extremely long duration (T_90>1000 s). Chance association of these three rare properties (i.e. large NH_x,i, super-soft Gamma_x and extreme duration) in the same class of explosions is statistically unlikely. We associate these properties with the turbulent mass-loss history of the progenitor star that enriched and shaped the circum-burst medium. We identify a natural connection between NH_x,i Gamma_x and T_90 in these sources by suggesting that the late-time super-soft X-rays originate from radiation reprocessed by material lost to the environment by the stellar progenitor before exploding, (either in the form of a dust echo or as reprocessed radiation from a long-lived GRB remnant), and that the interaction of the...

Margutti, Raffaella; Guidorzi, C; Lazzati, D; Milisavljevic, D; Kamble, A; Laskar, T; Parrent, J; Gehrels, N C

2014-01-01T23:59:59.000Z

234

Atmospheric Movement of Microorganisms in Clouds of Desert Dust and Implications for Human Health  

Science Journals Connector (OSTI)

...A. Centeno. 2005. Health effects of natural dust-role of trace elements and compounds...enumeration of heterotrophic bacteria in natural mineral water. World J. Microbiol...coccidioidomycosis following a severe natural dust storm. An outbreak at the Naval...

Dale W. Griffin

2007-07-01T23:59:59.000Z

235

Thursday, March 26, 2009 POSTER SESSION II: LUNAR DUST AND TRANSIENT SURFACE PHENOMENA  

E-Print Network [OSTI]

Modification of Materials for Lunar Dust Adhesion Mitigation [#1121] The surface energy of polymer films, magnetosphere, and the solar wind. Taylor L. A. Liu Y. Zhang A. Shape and Size Relationship of Several Lunar dust, but also introduce obstacle

Rathbun, Julie A.

236

Effect of Observation Network Design on Meteorological Forecasts of Asian Dust Events  

Science Journals Connector (OSTI)

To improve the prediction of Asian dust events on the Korean Peninsula, meteorological fields must be accurately predicted because dust transport models require them as input. Accurate meteorological forecasts could be obtained by integrating ...

Eun-Gyeong Yang; Hyun Mee Kim; JinWoong Kim; Jun Kyung Kay

2014-12-01T23:59:59.000Z

237

Airborne dust in Saudi Arabia : source areas, entrainment, simulation and composition.  

E-Print Network [OSTI]

??Spatial and temporal characteristics of dust storm activity in Saudi Arabia has been established using coarse-particle (PM10) dust concentrations recorded by the KACST monitoring network… (more)

Alharbi, Badr Hadhidh A

2009-01-01T23:59:59.000Z

238

Coal Fly Ash as a Source of Iron in Atmospheric Dust. | EMSL  

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

Coal Fly Ash as a Source of Iron in Atmospheric Dust. Coal Fly Ash as a Source of Iron in Atmospheric Dust. Abstract: Anthropogenic coal fly ash aerosols may represent a...

239

Integrated impact analysis of yellow-dust storms : a regional case study in China  

E-Print Network [OSTI]

The dust storm is a meteorological event that is caused by strong winds and proceeds from arid and semi-arid regions, transporting a thick cloud of fine sediments. In China, the sediments of dust storms mainly come from ...

Ai, Ning, 1978-

2003-01-01T23:59:59.000Z

240

Simultaneous detection/separation of mineral dust and cirrus clouds using MODIS thermal infrared window data  

E-Print Network [OSTI]

and cloud coverage for the Persian Gulf case compares reasonably well to those from the ``Deep Blue-laden scenes, including a daytime dust case over the Persian Gulf and two nighttime dust events over the Cape

Liou, K. N.

Note: This page contains sample records for the topic "fugitive dust emissions" 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

Engineering and economic impacts of prohibiting recombination recirculation dust at export elevators  

E-Print Network [OSTI]

The objectives of this research were to develop engineering descriptions of dust control systems currently being used in grain export facilities, to determine the retrofit requirements of the dust control and handling systems to comply...

Whitelock, Derek Paul

2012-06-07T23:59:59.000Z

242

Experimental quiescent drifting dusty plasmas and temporal dust acoustic wave growth  

SciTech Connect (OSTI)

We report on dust acoustic wave growth rate measurements taken in a dc (anode glow) discharge plasma device. By introducing a mesh with a variable bias 12-17 cm from the anode, we developed a technique to produce a drifting dusty plasma. A secondary dust cloud, free of dust acoustic waves, was trapped adjacent to the anode side of the mesh. When the mesh was returned to its floating potential, the secondary cloud was released and streamed towards the anode and primary dust cloud, spontaneously exciting dust acoustic waves. The amplitude growth of the excited dust acoustic waves was measured directly along with the wavelength and Doppler shifted frequency. These measurements were compared to fluid and kinetic dust acoustic wave theories. As the wave growth saturated a transition from linear to nonlinear waves was observed. The merging of the secondary and primary dust clouds was also observed.

Heinrich, J. R.; Kim, S.-H.; Meyer, J. K.; Merlino, R. L. [Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa 52242 (United States)

2011-11-15T23:59:59.000Z

243

State Emissions Estimates  

Gasoline and Diesel Fuel Update (EIA)

Estimates of state energy-related carbon dioxide emissions Estimates of state energy-related carbon dioxide emissions Because energy-related carbon dioxide (CO 2 ) constitutes over 80 percent of total emissions, the state energy-related CO 2 emission levels provide a good indicator of the relative contribution of individual states to total greenhouse gas emissions. The U.S. Energy Information Administration (EIA) emissions estimates at the state level for energy-related CO 2 are based on data contained in the State Energy Data System (SEDS). 1 The state-level emissions estimates are based on energy consumption data for the following fuel categories: three categories of coal (residential/commercial, industrial, and electric power sector); natural gas; and ten petroleum products including-- asphalt and road oil, aviation gasoline, distillate fuel, jet fuel, kerosene, liquefied petroleum gases

244

DISCOVERY OF 'WARM DUST' GALAXIES IN CLUSTERS AT z {approx} 0.3: EVIDENCE FOR STRIPPING OF COOL DUST IN THE DENSE ENVIRONMENT?  

SciTech Connect (OSTI)

Using far-infrared imaging from the 'Herschel Lensing Survey', we derive dust properties of spectroscopically confirmed cluster member galaxies within two massive systems at z {approx} 0.3: the merging Bullet Cluster and the more relaxed MS2137.3-2353. Most star-forming cluster sources ({approx}90%) have characteristic dust temperatures similar to local field galaxies of comparable infrared (IR) luminosity (T{sub dust} {approx} 30 K). Several sub-luminous infrared galaxy (LIRG; L{sub IR} < 10{sup 11} L{sub Sun }) Bullet Cluster members are much warmer (T{sub dust} > 37 K) with far-infrared spectral energy distribution (SED) shapes resembling LIRG-type local templates. X-ray and mid-infrared data suggest that obscured active galactic nuclei do not contribute significantly to the infrared flux of these 'warm dust' galaxies. Sources of comparable IR luminosity and dust temperature are not observed in the relaxed cluster MS2137, although the significance is too low to speculate on an origin involving recent cluster merging. 'Warm dust' galaxies are, however, statistically rarer in field samples (>3{sigma}), indicating that the responsible mechanism may relate to the dense environment. The spatial distribution of these sources is similar to the whole far-infrared bright population, i.e., preferentially located in the cluster periphery, although the galaxy hosts tend toward lower stellar masses (M{sub *} < 10{sup 10} M{sub Sun }). We propose dust stripping and heating processes which could be responsible for the unusually warm characteristic dust temperatures. A normal star-forming galaxy would need 30%-50% of its dust removed (preferentially stripped from the outer reaches, where dust is typically cooler) to recover an SED similar to a 'warm dust' galaxy. These progenitors would not require a higher IR luminosity or dust mass than the currently observed normal star-forming population.

Rawle, T. D.; Rex, M.; Egami, E.; Walth, G.; Pereira, M. J. [Steward Observatory, University of Arizona, 933 N. Cherry Avenue, Tucson, AZ 85721 (United States); Chung, S. M.; Gonzalez, A. H. [Department of Astronomy, University of Florida, Gainesville, FL 32611-2055 (United States); Perez-Gonzalez, P. G. [Departamento de Astrofisica, Facultad de CC. Fisicas,Universidad Complutense de Madrid, E-28040 Madrid (Spain); Smail, I. [Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LE (United Kingdom); Altieri, B.; Valtchanov, I. [Herschel Science Centre, ESAC, ESA, P.O. Box 78, Villanueva de la Canada, E-28691 Madrid (Spain); Appleton, P.; Fadda, D. [IPAC, California Institute of Technology, Pasadena, CA 91125 (United States); Alba, A. Berciano [ASTRON, Oude Hoogeveensedijk 4, NL-7991 PD Dwingeloo (Netherlands); Blain, A. W. [Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH (United Kingdom); Dessauges-Zavadsky, M. [Observatoire de Geneve, Universite de Geneve, 51 Ch. des Maillettes, CH-1290 Sauverny (Switzerland); Van der Werf, P. P. [Sterrewacht Leiden, Leiden University, P.O. Box 9513, NL-2300 RA Leiden (Netherlands); Zemcov, M., E-mail: trawle@as.arizona.edu [Department of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, CA 91125 (United States)

2012-09-10T23:59:59.000Z

245

Low Emissions Aftertreatment and Diesel Emissions Reduction  

SciTech Connect (OSTI)

Detroit Diesel Corporation (DDC) has successfully completed a five-year Low Emissions Aftertreatment and Diesel Emissions Reduction (LEADER) program under a DOE project entitled: ''Research and Development for Compression-Ignition Direct-Injection Engines (CIDI) and Aftertreatment Sub-Systems''. The objectives of the LEADER Program were to: Demonstrate technologies that will achieve future federal Tier 2 emissions targets; and Demonstrate production-viable technical targets for engine out emissions, efficiency, power density, noise, durability, production cost, aftertreatment volume and weight. These objectives were successfully met during the course of the LEADER program The most noteworthy achievements in this program are listed below: (1) Demonstrated Tier 2 Bin 3 emissions target over the FTP75 cycle on a PNGV-mule Neon passenger car, utilizing a CSF + SCR system These aggressive emissions were obtained with no ammonia (NH{sub 3}) slip and a combined fuel economy of 63 miles per gallon, integrating FTP75 and highway fuel economy transient cycle test results. Demonstrated feasibility to achieve Tier 2 Bin 8 emissions levels without active NOx aftertreatment. (2) Demonstrated Tier 2 Bin 3 emissions target over the FTP75 cycle on a light-duty truck utilizing a CSF + SCR system, synergizing efforts with the DOE-DDC DELTA program. This aggressive reduction in tailpipe out emissions was achieved with no ammonia slip and a 41% fuel economy improvement, compared to the equivalent gasoline engine-equipped vehicle. (3) Demonstrated Tier 2 near-Bin 9 emissions compliance on a light-duty truck, without active NOx aftertreatment devices, in synergy with the DOE-DDC DELTA program. (4) Developed and applied advanced combustion technologies such as ''CLEAN Combustion{copyright}'', which yields simultaneous reduction in engine out NOx and PM emissions while also improving engine and aftertreatment integration by providing favorable exhaust species and temperature characteristics. These favorable emissions characteristics were obtained while maintaining performance and fuel economy. These aggressive emissions and performance results were achieved by applying a robust systems technology development methodology. This systems approach benefits substantially from an integrated experimental and analytical approach to technology development, which is one of DDCs core competencies Also, DDC is uniquely positioned to undertake such a systems technology development approach, given its vertically integrated commercial structure within the DaimlerChrysler organization. State-of-the-art analytical tools were developed targeting specific LEADER program objectives and were applied to guide system enhancements and to provide testing directions, resulting in a shortened and efficient development cycle. Application examples include ammonia/NO{sub x} distribution improvement and urea injection controls development, and were key contributors to significantly reduce engine out as well as tailpipe out emissions. Successful cooperation between DDC and Engelhard Corporation, the major subcontractor for the LEADER program and provider of state-of-the-art technologies on various catalysts, was another contributing factor to ensure that both passenger car and LD truck applications achieved Tier 2 Bin 3 emissions levels. Significant technical challenges, which highlight barriers of commercialization of diesel technology for passenger cars and LD truck applications, are presented at the end of this report.

None

2005-05-27T23:59:59.000Z

246

Response of Colorado River runoff to dust radiative forcing in snow  

Science Journals Connector (OSTI)

...smaller than that of dust loading (45...downwind of several coal-fired power plants...energy-related combustion, 1850–2000 . Global...The ecology of dust . Front Ecol Environ...saturation vapor pressure at the snow surface...after disturbance dust loading (ADL) parameterization...

Thomas H. Painter; Jeffrey S. Deems; Jayne Belnap; Alan F. Hamlet; Christopher C. Landry; Bradley Udall

2010-01-01T23:59:59.000Z

247

NEW CONSTRAINTS ON COMPANIONS AND DUST WITHIN A FEW AU OF VEGA  

SciTech Connect (OSTI)

We report on high contrast near-infrared ({approx}2.2 {mu}m) observations of Vega obtained with the Palomar Fiber Nuller, a dual sub-aperture rotating coronagraph installed at the Palomar Hale telescope. The data show consistent astrophysical null depth measurements at the {approx_equal} 10{sup -3} level or below for three different baseline orientations spanning 60 deg in azimuth, with individual 1{sigma} uncertainties {<=}7 x 10{sup -4}. These high cancellation and accuracy levels translate into a dynamic range greater than 1000:1 inside the diffraction limit of the 5 m telescope beam. Such high contrast performance is unprecedented in the near-infrared and provides improved constraints on Vega's immediate ({approx_equal}20 to 250 mas, or {approx_equal}0.15 to 2 AU) environment. In particular, our measurements rule out any potential companion in the [0.25-1 AU] region contributing more than 1% of the overall near-infrared stellar flux, with limits as low as 0.2% near 0.6 AU. These are the best upper limits established so far by direct detection for a companion to Vega in this inner region. We also conclude that any dust population contributing a significant ({>=}1%) near-infrared thermal excess can arise only within 0.2 AU of the star, and that it must consist of much smaller grains than in the solar zodiacal cloud. Dust emission from farther than {approx_equal}2 AU is also not ruled out by our observations, but would have to originate in strong scattering, pointing again to very small grains.

Mennesson, B.; Serabyn, E.; Martin, S. R.; Liewer, K.; Mawet, D. [Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109-8099 (United States); Hanot, C., E-mail: bertrand.mennesson@jpl.nasa.gov [AEOS, University of Liege, Allee du 6 Aout, 17 Bat B5c, 4000 Liege (Belgium)

2011-07-20T23:59:59.000Z

248

WEATHER MODIFICATION BY CARBON DUST ABSORPTION OF SOLAR ENERGY  

E-Print Network [OSTI]

WEATHER MODIFICATION BY CARBON DUST ABSORPTION OF SOLAR ENERGY by WM. M. GRAY, WM. M. FRANK, M OF SOLAR ENERGY by w. M. Gray, W. M. Frank, M. L. Corrin and C. A. Stokes Department of Atmospheric Science interception of solar energy. Growing population pressures and predicted future global food shortages dictate

Gray, William

249

Temperature-influenced dynamics of small dust particles  

Science Journals Connector (OSTI)

......e.g. Sun for the case...its internal distribution in the particle...vary with its temperature. The largest...distance from the Sun is followed...depend on temperature. Consequently...the complex distribution of dust material...characterized by temperature-dependent...distance to the Sun (i.e......

M. Kocifaj; J. Klacka; H. Horvath

2006-08-21T23:59:59.000Z

250

Global observations of desert dust and biomass burning aerosols  

E-Print Network [OSTI]

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

Graaf, Martin de

251

The dust and gas content of the Crab Nebula  

E-Print Network [OSTI]

We have constructed MOCASSIN photoionization plus dust radiative transfer models for the Crab Nebula core-collapse supernova (CCSN) remnant, using either smooth or clumped mass distributions, in order to determine the chemical composition and masses of the nebular gas and dust. We computed models for several different geometries suggested for the nebular matter distribution but found that the observed gas and dust spectra are relatively insensitive to these geometries, being determined mainly by the spectrum of the pulsar wind nebula which ionizes and heats the nebula. Smooth distribution models are ruled out since they require 16-49 Msun of gas to fit the integrated optical nebular line fluxes, whereas our clumped models require 7.0 Msun of gas. neither of which can be matched by current CCSN yield predictions. A global gas-phase C/O ratio of 1.65 by number is derived, along with a He/H number ratio of 1.85, A carbonaceous dust composition is favoured by the observed gas-phase C/O ratio: amorphous carbon clu...

Owen, P J

2015-01-01T23:59:59.000Z

252

Destruction of Interstellar Dust in Evolving Supernova Remnant Shock Waves  

E-Print Network [OSTI]

Supernova generated shock waves are responsible for most of the destruction of dust grains in the interstellar medium (ISM). Calculations of the dust destruction timescale have so far been carried out using plane parallel steady shocks, however that approximation breaks down when the destruction timescale becomes longer than that for the evolution of the supernova remnant (SNR) shock. In this paper we present new calculations of grain destruction in evolving, radiative SNRs. To facilitate comparison with the previous study by Jones et al. (1996), we adopt the same dust properties as in that paper. We find that the efficiencies of grain destruction are most divergent from those for a steady shock when the thermal history of a shocked gas parcel in the SNR differs significantly from that behind a steady shock. This occurs in shocks with velocities >~ 200 km/s for which the remnant is just beginning to go radiative. Assuming SNRs evolve in a warm phase dominated ISM, we find dust destruction timescales are incre...

Slavin, Jonathan D; Jones, Anthony P

2015-01-01T23:59:59.000Z

253

Imaging of high-speed dust particle trajectories on NSTX  

SciTech Connect (OSTI)

Imaging of high-speed incandescent dust particle trajectories in a tokamak plasma has been accomplished on NSTX using up to three high-speed cameras each viewing the same plasma volume from different locations and operating at speeds up to 68 000 frames/s with exposure times varying from 2 to 300 {mu}s. The dynamics of the dust trajectories can be quite complex exhibiting a large variation in both speed (10-200 m/s) and direction. Simulations of these trajectories will be utilized to ascertain the role dust may play in future machines such as ITER where significant dust production from wall erosion is expected. NSTX has numerous view ports including both tangential as well as radial views in both the midplane and lower divertors. Several vertical ports are also available so that a few specific regions in NSTX may be viewed simultaneously from several different camera positions. The cameras can be operated in the full visible spectrum but near-infrared filters can be utilized to enhance the observation of incandescent particles against a bright background. A description of the cameras and required optics is presented.

Roquemore, A. L.; Davis, W.; Kaita, R.; Skinner, C. H.; Maqueda, R.; Nishino, N. [Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States); Nova Photonics, Inc., Princeton, New Jersey 08540 (United States); Hiroshima University, Hiroshima 739-8527 (Japan)

2006-10-15T23:59:59.000Z

254

The effect of dust on Tremaine–Weinberg measurements  

Science Journals Connector (OSTI)

......plotting versus produces a straight line with slope omegap...obtained from fitting such straight lines as omega sin i...evolved using a tree code (gasoline). The star formation...listed under column . Run a B omegap omega0 Error...two categories: (i) straight dust lanes which are......

Joris Gerssen; Victor P. Debattista

2007-06-11T23:59:59.000Z

255

Carbon Emissions: Food Industry  

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

Food Industry Food Industry Carbon Emissions in the Food Industry The Industry at a Glance, 1994 (SIC Code: 20) Total Energy-Related Emissions: 24.4 million metric tons of carbon (MMTC) -- Pct. of All Manufacturers: 6.6% Total First Use of Energy: 1,193 trillion Btu -- Pct. of All Manufacturers: 5.5% Carbon Intensity: 20.44 MMTC per quadrillion Btu Energy Information Administration, "1994 Manufacturing Energy Consumption Survey" and Emissions of Greenhouse Gases in the United States 1998 Energy-Related Carbon Emissions, 1994 Source of Carbon Carbon Emissions (million metric tons) All Energy Sources 24.4 Net Electricity 9.8 Natural Gas 9.1 Coal 4.2 All Other Sources 1.3 Energy Information Administration, "1994 Manufacturing Energy Consumption Survey" and Emissions of Greenhouse Gases in the United States 1998

256

Carbon Emissions: Chemicals Industry  

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

Chemicals Industry Chemicals Industry Carbon Emissions in the Chemicals Industry The Industry at a Glance, 1994 (SIC Code: 28) Total Energy-Related Emissions: 78.3 million metric tons of carbon (MMTC) -- Pct. of All Manufacturers: 21.1% -- Nonfuel Emissions: 12.0 MMTC Total First Use of Energy: 5,328 trillion Btu -- Pct. of All Manufacturers: 24.6% Energy Sources Used As Feedstocks: 2,297 trillion Btu -- LPG: 1,365 trillion Btu -- Natural Gas: 674 trillion Btu Carbon Intensity: 14.70 MMTC per quadrillion Btu Energy Information Administration, "1994 Manufacturing Energy Consumption Survey" and Emissions of Greenhouse Gases in the United States 1998 Energy-Related Carbon Emissions, 1994 Source of Carbon Carbon Emissions (million metric tons) All Energy Sources 78.3 Natural Gas 32.1

257

NETL: Mercury Emissions Control  

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

Home > Technologies > Coal & Power Systems > Innovations for Existing Plants > Mercury Emissions Control Home > Technologies > Coal & Power Systems > Innovations for Existing Plants > Mercury Emissions Control Innovations for Existing Plants Mercury Emissions Control NETL managed the largest funded research program in the country to develop an in-depth understanding of fossil combustion-based mercury emissions. The program goal was to develop effective control options that would allow generators to comply with regulations. Research focus areas included measurement and characterization of mercury emissions, as well as the development of cost-effective control technologies for the U.S. coal-fired electric generating industry. Control Technologies Field Testing Phase I & II Phase III Novel Concepts APCD Co-benefits Emissions Characterization

258

Carbon Emissions: Paper Industry  

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

Paper Industry Paper Industry Carbon Emissions in the Paper Industry The Industry at a Glance, 1994 (SIC Code: 26) Total Energy-Related Emissions: 31.6 million metric tons of carbon (MMTC) -- Pct. of All Manufacturers: 8.5% Total First Use of Energy: 2,665 trillion Btu -- Pct. of All Manufacturers: 12.3% -- Pct. Renewable Energy: 47.7% Carbon Intensity: 11.88 MMTC per quadrillion Btu Renewable Energy Sources (no net emissions): -- Pulping liquor: 882 trillion Btu -- Wood chips and bark: 389 trillion Btu Energy Information Administration, "1994 Manufacturing Energy Consumption Survey" and Emissions of Greenhouse Gases in the United States 1998 Energy-Related Carbon Emissions, 1994 Source of Carbon Carbon Emissions (million metric tons) All Energy Sources 31.6 Net Electricity 11.0

259

emissions | OpenEI  

Open Energy Info (EERE)

emissions emissions Dataset Summary Description The New Zealand Ministry of Economic Development publishes an annual Energy Outlook, which presents projections of New Zealand's future energy supply, demand, prices and greenhouse gas emissions. The principle aim of these projections is to inform the national energy debate. Included here are the model results for emissions. The spreadsheet provides an interactive tool for selecting which model results to view, and which scenarios to evaluate; full model results for each scenario are also included. Source New Zealand Ministry of Economic Development Date Released Unknown Date Updated December 15th, 2010 (4 years ago) Keywords emissions New Zealand projections Data application/vnd.ms-excel icon 2010 New Zealand emissions outlook (xls, 1.2 MiB)

260

Reducing Diesel Engine Emissions  

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

Reducing Reducing Diesel Engine Emissions 2 0 1 0 Green TransporTaTion TechnoloGies Compared to traditional gasoline engines, diesel engines require less maintenance, generate energy more efficiently, and produce less carbon dioxide emissions. But when uncontrolled, diesel engines churn out harmful emissions like particu- late matter (PM) and nitrogen oxides (NO x ). Researchers at Argonne National Laboratory are currently working to develop

Note: This page contains sample records for the topic "fugitive dust emissions" 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

Saving Fuel, Reducing Emissions  

E-Print Network [OSTI]

would in turn lower PHEV fuel costs and make them morestretches from fossil-fuel- powered conventional vehiclesbraking, as do Saving Fuel, Reducing Emissions Making Plug-

Kammen, Daniel M.; Arons, Samuel M.; Lemoine, Derek M.; Hummel, Holmes

2009-01-01T23:59:59.000Z

262

Vehicle Emissions Review - 2012  

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

Vehicle Emissions Review - 2012 Tim Johnson October 16, 2012 2 Environmental Technologies Summary * Regulations - LEVIII finalized, Tier 3? RDE in Europe developing and very...

263

EMSL - emission spectra  

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

emission-spectra en Structures and Stabilities of (MgO)n Nanoclusters. http:www.emsl.pnl.govemslwebpublicationsstructures-and-stabilities-mgon-nanoclusters

264

NETL: Emissions Characterization - CMU Emissions Characterization Study  

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

Source Emissions Characterization Study Source Emissions Characterization Study The emissions characterization study is being performed in conjunction with the Pittsburgh Air Quality Study [PDF-744KB], a larger effort that includes ambient measurements and atmospheric modeling of the Pittsburgh region. The main objectives of this portion of the study are: To achieve advanced characterization of the PM in the Pittsburgh region. Measurements include the PM size, surface, volume, and mass distribution; chemical composition as a function of size and on a single particle basis; temporal and spatial variability. To obtain accurate current fingerprints of the major primary PM sources in the Pittsburgh region using traditional filter-based sampling and state-of-the-art techniques such as dilution sampling and single particle analysis using mass spectroscopy and LIBS.

265

Long-range transport of Saharan dust over northwestern Europe during EUCAARI 2008 campaign: Evolution of dust optical  

E-Print Network [OSTI]

conditions govern the life cycle of dust microphysical phenomena, providing conditions for transformation emitted during the study period is estimated to 185 Tg. The analysis of the removal processes reveals, energetic wind systems, and a coupling to wind system that facilitate long-range transport. Estimated annual

Paris-Sud XI, Université de

266

Global Warming Is Driven by Anthropogenic Emissions: A Time Series Analysis Approach  

Science Journals Connector (OSTI)

The solar influence on global climate is nonstationary. Processes such as the Schwabe and Gleissberg cycles of the Sun, or the many intrinsic atmospheric oscillation modes, yield a complex pattern of interaction with multiple time scales. In addition, emissions of greenhouse gases, aerosols, or volcanic dust perturb the dynamics of this coupled system to different and still uncertain extents. Here we show, using two independent driving force reconstruction techniques, that the combined effect of greenhouse gases and aerosol emissions has been the main external driver of global climate during the past decades.

Pablo F. Verdes

2007-07-24T23:59:59.000Z

267

Dust acoustic solitary and shock excitations in a Thomas-Fermi magnetoplasma  

SciTech Connect (OSTI)

The linear and nonlinear properties of dust-acoustic waves are investigated in a collisionless Thomas-Fermi magnetoplasma, whose constituents are electrons, ions, and negatively charged dust particles. At dust time scale, the electron and ion number densities follow the Thomas-Fermi distribution, whereas the dust component is described by the classical fluid equations. A linear dispersion relation is analyzed to show that the wave frequencies associated with the upper and lower modes are enhanced with the variation of dust concentration. The effect of the latter is seen more strongly on the upper mode as compared to the lower mode. For nonlinear analysis, we obtain magnetized Korteweg-de Vries (KdV) and Zakharov-Kuznetsov (ZK) equations involving the dust-acoustic solitary waves in the framework of reductive perturbation technique. Furthermore, the shock wave excitations are also studied by allowing dissipation effects in the model, leading to the Korteweg-de Vries-Burgers (KdVB) and ZKB equations. The analysis reveals that the dust-acoustic solitary and shock excitations in a Thomas-Fermi plasma are strongly influenced by the plasma parameters, e.g., dust concentration, dust temperature, obliqueness, magnetic field strength, and dust fluid viscosity. The present results should be important for understanding the solitary and shock excitations in the environments of white dwarfs or supernova, where dust particles can exist.

Rahim, Z.; Qamar, A. [Institute of Physics and Electronics, University of Peshawar, Peshawar 25000 (Pakistan); National Center for Physics (NCP) at QAU Campus, Shahdra Valley Road, Islamabad 44000 (Pakistan); Ali, S. [National Center for Physics (NCP) at QAU Campus, Shahdra Valley Road, Islamabad 44000 (Pakistan)

2014-07-15T23:59:59.000Z

268

Dust Deserves More than the Brush-Off | Department of Energy  

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

Dust Deserves More than the Brush-Off Dust Deserves More than the Brush-Off Dust Deserves More than the Brush-Off July 6, 2012 - 10:35am Addthis The dust particles act as a "heat pump" drawing heat from the sun and surface, and attracting moisture from the Gulf of California and the Gulf of Mexico. Without dust, rainfall would be up to 40 percent less over Arizona, New Mexico and Texas. | Creative Commons photo by Jared The dust particles act as a "heat pump" drawing heat from the sun and surface, and attracting moisture from the Gulf of California and the Gulf of Mexico. Without dust, rainfall would be up to 40 percent less over Arizona, New Mexico and Texas. | Creative Commons photo by Jared

269

Catalysts for Lean Engine Emission Control - Emissions & Emission Controls  

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

Catalysts for Lean Engine Emission Control Catalysts for Lean Engine Emission Control Catalysts for controlling NOx from lean engines are studied in great detail at FEERC. Lean NOx Traps (LNTs) and Selective Catalytic Reduction (SCR) are two catalyst technologies of interest. Catalysts are studied from the nanoscale to full scale. On the nanoscale, catalyst powders are analyzed with chemisorptions techniques to determine the active metal surface area where catalysis occurs. Diffuse Reflectance Infrared Fourier Transform (DRIFT) spectroscopy is used to observe the chemical reactions occurring on the catalyst surface during catalyst operation. Both powder and coated catalyst samples are analyzed on bench flow reactors in controlled simulated exhaust environments to better characterize the chemical

270

Air Emission Inventory for the INEEL -- 1999 Emission Report  

SciTech Connect (OSTI)

This report presents the 1999 calendar year update of the Air Emission Inventory for the Idaho National Engineering and Environmental Laboratory (INEEL). The INEEL Air Emission Inventory documents sources and emissions of nonradionuclide pollutants from operations at the INEEL. The report describes the emission inventory process and all of the sources at the INEEL, and provides nonradionuclide emissions estimates for stationary sources.

Zohner, Steven K

2000-05-01T23:59:59.000Z

271

NETL: IEP - Mercury Emissions Control: Emissions Characterization  

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

Control Control Emissions Characterization In anticipation of the 1990 CAAAs, specifically the draft Title III regarding the characterization of potential HAPs from electric steam generating units, DOE initiated a new Air Toxics Program in 1989. The DOE Mercury Measurement and Control Program evolved as a result of the findings from the comprehensive assessment of hazardous air pollutants studies conducted by DOE from 1990 through 1997. DOE, in collaboration with EPRI, performed stack tests at a number of coal-fired power plants (identified on map below) to accurately determine the emission rates of a series of potentially toxic chemicals. These tests had not been conducted previously because of their cost, about $1 million per test, so conventional wisdom on emissions was based on emission factors derived from analyses of coal. In general, actual emissions were found to be about one-tenth previous estimates, due to a high fraction of the pollutants being captured by existing particulate control systems. These data resulted in a decision by EPA that most of these pollutants were not a threat to the environment, and needed no further regulation at power plants. This shielded the coal-fired power industry from major (tens of millions) costs that would have resulted from further controlling these emissions. However, another finding of these studies was that mercury was not effectively controlled in coal-fired utility boiler systems. Moreover, EPA concluded that a plausible link exists between these emissions and adverse health effects. Ineffective control of mercury by existing control technologies resulted from a number of factors, including variation in coal composition and variability in the form of the mercury in flue gases. The volatility of mercury was the main contributor for less removal, as compared to the less volatile trace elements/metals which were being removed at efficiencies over 99% with the fly ash. In addition, it was determined that there was no reliable mercury speciation method to accurately distinguish between the elemental and oxidized forms of mercury in the flue gas. These two forms of mercury respond differently to removal techniques in existing air pollution control devices utilized by the coal-fired utility industry.

272

E-Print Network 3.0 - ambient urban levels Sample Search Results  

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

Summary: that seven major sources of ambient PM10 were urban fugitive dust, crustal soil, coal combustion, secondary... diameter of 10 m or less) exceeded the level II of...

273

Microsoft Word - DOE-ID-INL-13-024.docx  

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

must be minimized in accordance with the methods specified in Rules for the Control of Air Pollution in Idaho (IDAPA 58.01.01.650-651). Steps taken to control fugitive dust at...

274

THE IMPORTANCE OF PHYSICAL MODELS FOR DERIVING DUST MASSES AND GRAIN SIZE DISTRIBUTIONS IN SUPERNOVA EJECTA. I. RADIATIVELY HEATED DUST IN THE CRAB NEBULA  

SciTech Connect (OSTI)

Recent far-infrared (IR) observations of supernova remnants (SNRs) have revealed significantly large amounts of newly condensed dust in their ejecta, comparable to the total mass of available refractory elements. The dust masses derived from these observations assume that all the grains of a given species radiate at the same temperature, regardless of the dust heating mechanism or grain radius. In this paper, we derive the dust mass in the ejecta of the Crab Nebula, using a physical model for the heating and radiation from the dust. We adopt a power-law distribution of grain sizes and two different dust compositions (silicates and amorphous carbon), and calculate the heating rate of each dust grain by the radiation from the pulsar wind nebula. We find that the grains attain a continuous range of temperatures, depending on their size and composition. The total mass derived from the best-fit models to the observed IR spectrum is 0.019-0.13 M{sub Sun }, depending on the assumed grain composition. We find that the power-law size distribution of dust grains is characterized by a power-law index of 3.5-4.0 and a maximum grain size larger than 0.1 {mu}m. The grain sizes and composition are consistent with what is expected for dust grains formed in a Type IIP supernova (SN). Our derived dust mass is at least a factor of two less than the mass reported in previous studies of the Crab Nebula that assumed more simplified two-temperature models. These models also require a larger mass of refractory elements to be locked up in dust than was likely available in the ejecta. The results of this study show that a physical model resulting in a realistic distribution of dust temperatures can constrain the dust properties and affect the derived dust masses. Our study may also have important implications for deriving grain properties and mass estimates in other SNRs and for the ultimate question of whether SNe are major sources of dust in the Galactic interstellar medium and in external galaxies.

Temim, Tea; Dwek, Eli, E-mail: tea.temim@nasa.gov [Observational Cosmology Lab, Code 665, NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)

2013-09-01T23:59:59.000Z

275

First-light LBT nulling interferometric observations: warm exozodiacal dust resolved within a few AU of eta Corvi  

E-Print Network [OSTI]

We report on the first nulling interferometric observations with the Large Binocular Telescope Interferometer (LBTI), resolving the N' band (9.81 - 12.41 um) emission around the nearby main-sequence star eta Crv (F2V, 1-2 Gyr). The measured source null depth amounts to 4.40% +/- 0.35% over a field-of-view of 140 mas in radius (~2.6\\,AU at the distance of eta Corvi) and shows no significant variation over 35{\\deg} of sky rotation. This relatively low null is unexpected given the total disk to star flux ratio measured by Spitzer/IRS (~23% across the N' band), suggesting that a significant fraction of the dust lies within the central nulled response of the LBTI (79 mas or 1.4 AU). Modeling of the warm disk shows that it cannot resemble a scaled version of the Solar zodiacal cloud, unless it is almost perpendicular to the outer disk imaged by Herschel. It is more likely that the inner and outer disks are coplanar and the warm dust is located at a distance of 0.5-1.0 AU, significantly closer than previously predic...

Defrère, D; Skemer, A J; Kennedy, G M; Bailey, V P; Hoffmann, W F; Mennesson, B; Millan-Gabet, R; Danchi, W C; Absil, O; Arbo, P; Beichman, C; Brusa, G; Bryden, G; Downey, E C; Durney, O; Esposito, S; Gaspar, A; Grenz, P; Haniff, C; Hill, J M; Lebreton, J; Leisenring, J M; Males, J R; Marion, L; McMahon, T J; Montoya, M; Morzinski, K M; Pinna, E; Puglisi, A; Rieke, G; Roberge, A; Serabyn, E; Sosa, R; Stapeldfeldt, K; Su, K; Vaitheeswaran, V; Vaz, A; Weinberger, A J; Wyatt, M C

2015-01-01T23:59:59.000Z

276

Graphite dust resuspension in an HTR-10 steam generator  

Science Journals Connector (OSTI)

Abstract Graphite dust has an important effect on the safety of high-temperature gas-cooled reactors (HTR). The flow field in the steam generator was studied by the computational fluid dynamics (CFD) method, with the results indicating that the friction velocity in the windward and the leeward of the heat transfer tubes is relatively low and is higher at the sides. Further analysis of the resuspension of graphite dust indicates that the resuspension fraction reaches nearly zero for particles with a diameter less than 1 ?m, whereas it will increases as the helium velocity in the steam generator increases for particle size larger than 1 ?m. Moreover, the resuspension fraction increases as the particle size increases. The results also indicate that resuspension of the particles with sizes larger than 1 ?m exhibited obvious differences in different parts of the steam generator.

Wei Peng; Tianqi Zhang; Yanan Zhen; Suyuan Yu

2014-01-01T23:59:59.000Z

277

Color-based tracking of plasma dust particles  

SciTech Connect (OSTI)

Color-based tracking to observe agglomeration of deposited particles inside a compact planar magnetron during plasma discharge was done by creating high dynamic range (HDR) images of photos captured by a Pentax K10D digital camera. Carbon erosion and redeposition was also monitored using the technique. The HDR images were subjected to a chromaticity-based constraint discoloration inside the plasma chamber indicating film formation or carbon redeposition. Results show that dust deposition occurs first near the evacuation pumps due to the pressure gradient and then accumulates at the positively charged walls of the chamber. This method can be applied to monitor dust formation during dusty plasma experiments without major modification of plasma devices, useful especially for large fusion reactors.

Villamayor, Michelle Marie S., E-mail: mvillamayor@nip.upd.edu.ph; Soriano, Maricor N.; Ramos, Henry J. [National Institute of Physics, University of the Philippines, Diliman, Quezon City 1101 (Philippines)] [National Institute of Physics, University of the Philippines, Diliman, Quezon City 1101 (Philippines); Kato, Shuichi; Wada, Motoi [Graduate School of Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321 (Japan)] [Graduate School of Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321 (Japan)

2014-02-15T23:59:59.000Z

278

Spherically symmetric cosmological spacetimes with dust and radiation — numerical implementation  

SciTech Connect (OSTI)

We present new numerical cosmological solutions of the Einstein Field Equations. The spacetime is spherically symmetric with a source of dust and radiation approximated as a perfect fluid. The dust and radiation are necessarily non-comoving due to the inhomogeneity of the spacetime. Such a model can be used to investigate non-linear general relativistic effects present during decoupling or big-bang nucleosynthesis, as well as for investigating void models of dark energy with isocurvature degrees of freedom. We describe the full evolution of the spacetime as well as the redshift and luminosity distance for a central observer. After demonstrating accuracy of the code, we consider a few example models, and demonstrate the sensitivity of the late time model to the degree of inhomogeneity of the initial radiation contrast.

Lim, Woei Chet [Department of Mathematics, University of Waikato, Private Bag 3105, Hamilton 3240 (New Zealand); Regis, Marco [Dipartimento di Fisica, Università di Torino and INFN, Torino (Italy); Clarkson, Chris, E-mail: wclim@waikato.ac.nz, E-mail: regis@to.infn.it, E-mail: chris.clarkson@gmail.com [Astrophysics, Cosmology and Gravity Centre, and Department of Mathematics and Applied Mathematics, University of Cape Town, Rondebosch 7701, Cape Town (South Africa)

2013-10-01T23:59:59.000Z

279

1.8 - Early Solar Nebula Grains – Interplanetary Dust Particles  

Science Journals Connector (OSTI)

Abstract This chapter examines the compositions, mineralogy, sources, and geochemical significance of interplanetary dust particles (IDPs). Despite their micrometer-scale dimensions and nanogram masses, it is now possible, primarily as a result of advances in small particle handling techniques and analytical instrumentation, to examine \\{IDPs\\} at close to atomic-scale resolution. The most widely used instruments for IDP studies are presently the analytical electron microscope, synchrotron facilities, and the ion microprobe. These laboratory analytical techniques are providing fundamental insights about IDP origins, mechanisms of formation, and grain processing phenomena that were important in the early solar system and presolar environments. At the same time, laboratory data from \\{IDPs\\} are being compared with astronomical data from dust in comets, circumstellar disks, and the interstellar medium. The direct comparison of grains in the laboratory with grains in astronomical environments is known as ‘astromineralogy.’

J.P. Bradley

2014-01-01T23:59:59.000Z

280

Characteristics of PCDD/F distributions in vapor and solid phases and emissions from the Waelz process  

SciTech Connect (OSTI)

The Waelz process is a classic method used for recovering zinc from electric arc furnace (EAF) dusts containing relatively high concentrations of PCDD/Fs (polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans) as well as volatile metals, such as Zn, Pb, and Cu, and chlorine. The EAF dust is mixed with coke (30%) and sand (20%) then fed into a rotary kiln. Significant PCDD/Fs are formed in the typical Waelz process, causing public concerns regarding PCDD/F emissions. In this study, flue gas and ash samplings are simultaneously conducted at different sampling points to evaluate the removal efficiency and the partitioning of PCDD/Fs between the vapor and solid phases in the Waelz plant investigated. With the environment (temperature window, sufficient retention time, chlorine, and catalysts available) conducive to PCDD/F formation in the dust settling chamber (DSC), a significantly high PCDD/F concentration (1223 ng TEQ/Nm{sup 3}) is measured in flue gas downstream from the DSC of the Waelz plant investigated. In addition, the cyclone and bag filter adopted in this facility can only remove 51.3% and 69.4%, respectively, of the PCDD/Fs in the flue gas, resulting in a high PCDD/F concentration (145 ng TEQ/Nm{sup 3}) measured in the stack gas of the Waelz plant investigated. On the basis of treating 1 ton of EAF dust, the total PCDD/F discharge (stack gas emission + ash discharge) is 840 ng TEQ/kg EAF dust of the Waelz plant investigated. Because of the lack of effective air pollutant control devices for PCDD/Fs, about 560 ng TEQ/kg EAF dust are discharged via stack gas in this facility. 16 refs., 7 figs., 2 tabs.

Kai Hsien Chi; Shu Hao Chang; Moo Been Chang [National Central University, Chungli (Taiwan). Graduate Institute of Environmental Engineering

2006-03-15T23:59:59.000Z

Note: This page contains sample records for the topic "fugitive dust emissions" 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

Polycyclic aromatic hydrocarbon emission profiles and removal efficiency by electrostatic precipitator and wetfine scrubber in an iron ore sintering plant  

SciTech Connect (OSTI)

A monitoring campaign of polychlorinated dibenzo-p-dioxins and dibenzofurans, polyaromatic hydrocarbons (PAHs), and polychlorinated biphenyl was carried out in an Italian iron ore sintering plant by sampling the combustion gases at the electrostatic precipitator (ESP) outlet, at the Wetfine scrubber (WS) outlet, and by collecting the ESP dust. Few data are available on these micropollutants produced in iron ore sintering plants, particularly from Italian plants. This study investigates the PAH emission profiles and the removal efficiency of ESPs and WS. PAHs were determined at the stack, ESP outlet flue gases, and in ESP dust to characterize the emission profiles and the performance of the ESP and the WS for reducing PAH emission. The 11 PAHs monitored are listed in the Italian legislative decree 152/2006. The mean total PAH sum concentration in the stack flue gases is 3.96 {mu}g/N m{sup 3}, in ESP outlet flue gases is 9.73 {mu}g/N m{sup 3}, and in ESP dust is 0.53 {mu}g/g. Regarding the emission profiles, the most abundant compound is benzo(b)fluoranthene, which has a relative low BaP toxic equivalency factors (TEF) value, followed by dibenzo(a,l)pyrene, which has a very high BaP(TEF) value. The emission profiles in ESP dust and in the flue gases after the ESP show some changes, whereas the fingerprint in ESP and stack flue gases is very similar. The removal efficiency of the ESP and of WS on the total PAH concentration is 5.2 and 59.5%, respectively. 2 figs., 5 tabs.

Ettore Guerriero; Antonina Lutri; Rosanna Mabilia; Maria Concetta Tomasi Sciano; Mauro Rotatori [Istituto sull'Inquinamento Atmosferico, Monterotondo Scalo (Italy). Consiglio Nazionale delle Ricerche

2008-11-15T23:59:59.000Z

282

Modelling the effects of dust on galaxy spectra Miller Crawford  

E-Print Network [OSTI]

of a double exponential: ae d = ae 0 exp (\\GammaR=R d ) exp (\\Gammajzj=z d ) where z = r cos ` The bulge is given by a King profile: ae b = ae 0 h 1 + i r r c j 2 i \\Gammafl where fl = 3=2 (stars) and fl = 3=4(dust) Disks are truncated at R gal = 6R d , and bulges are truncated at the tidal radius R t = 10 2:2 r

Tittley, Eric

283

Canadian House Dust Study: Lead Bioaccessibility and Speciation  

SciTech Connect (OSTI)

Vacuum samples were collected from 1025 randomly selected urban Canadian homes to investigate bioaccessible Pb (Pb{sub S}) concentrations in settled house dust. Results indicate a polymodal frequency distribution, consisting of three lognormally distributed subpopulations defined as 'urban background' (geomean 58 {micro}g g{sup -1}), 'elevated' (geomean 447 {micro}g g{sup -1}), and 'anomalous' (geomean 1730 {micro}g g{sup -1}). Dust Pb{sub S} concentrations in 924 homes (90%) fall into the 'urban background' category. The elevated and anomalous subpopulations predominantly consist of older homes located in central core areas of cities. The influence of house age is evidenced by a moderate correlation between house age and dust Pb{sub S} content (R{sup 2} = 0.34; n = 1025; p < 0.01), but it is notable that more than 10% of homes in the elevated/anomalous category were built after 1980. Conversely, the benefit of home remediation is evidenced by the large number of homes (33%) in the background category that were built before 1960. The dominant dust Pb species determined using X-ray Absorption Spectroscopy were as follows: Pb carbonate, Pb hydroxyl carbonate, Pb sulfate, Pb chromate, Pb oxide, Pb citrate, Pb metal, Pb adsorbed to Fe- and Al-oxyhydroxides, and Pb adsorbed to humate. Pb bioaccessibility estimated from solid phase speciation predicts Pb bioaccessibility measured using a simulated gastric extraction (R{sup 2} = 0.85; n = 12; p < 0.0001). The trend toward increased Pb bioaccessibility in the elevated and anomalous subpopulations (75% {+-} 18% and 81% {+-} 8%, respectively) compared to background (63% {+-} 18%) is explained by the higher proportion of bioaccessible compounds used as pigments in older paints (Pb carbonate and Pb hydroxyl carbonate). This population-based study provides a nationally representative urban baseline for applications in human health risk assessment and risk management.

P Rasmussen; S Beauchemin; M Chenier; C Levesque; L MacLean; L Marrow; H Jones-Otazo; S Petrovic; L McDonald; H Gardner

2011-12-31T23:59:59.000Z

284

Carbon formation and metal dusting in advanced coal gasification processes  

SciTech Connect (OSTI)

The product gases generated by coal gasification systems contain high concentrations of CO and, characteristically, have relatively high carbon activities. Accordingly, carbon deposition and metal dusting can potentially degrade the operation of such gasifier systems. Therefore, the product gas compositions of eight representative gasifier systems were examined with respect to the carbon activity of the gases at temperatures ranging from 480 to 1,090 C. Phase stability calculations indicated that Fe{sub 3}C is stable only under very limited thermodynamic conditions and with certain kinetic assumptions and that FeO and Fe{sub 0.877}S tend to form instead of the carbide. As formation of Fe{sub 3}C is a necessary step in the metal dusting of steels, there are numerous gasifier environments where this type of carbon-related degradation will not occur, particularly under conditions associated with higher oxygen and sulfur activities. These calculations also indicated that the removal of H{sub 2}S by a hot-gas cleanup system may have less effect on the formation of Fe{sub 3}C in air-blown gasifier environments, where the iron oxide phase can exist and is unaffected by the removal of sulfur, than in oxygen-blown systems, where iron sulfide provides the only potential barrier to Fe{sub 3}C formation. Use of carbon- and/or low-alloy steels dictates that the process gas composition be such that Fe{sub 3}C cannot form if the potential for metal dusting is to be eliminated. Alternatively, process modifications could include the reintroduction of hydrogen sulfide, cooling the gas to perhaps as low as 400 C and/or steam injection. If higher-alloy steels are used, a hydrogen sulfide-free gas may be processed without concern about carbon deposition and metal dusting.

DeVan, J.H.; Tortorelli, P.F.; Judkins, R.R.; Wright, I.G.

1997-02-01T23:59:59.000Z

285

Nanoparticle Emissions from Internal Combustion Engines | Department...  

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

Nanoparticle Emissions from Internal Combustion Engines Nanoparticle Emissions from Internal Combustion Engines 2004 Diesel Engine Emissions Reduction (DEER) Conference...

286

Materials Applications of Photoelectron Emission Microscopy....  

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

Applications of Photoelectron Emission Microscopy. Materials Applications of Photoelectron Emission Microscopy. Abstract: Photoelectron emission microscopy (PEEM) is a versatile...

287

Spontaneous Emission Rate Enhancement Using Optical Antennas  

E-Print Network [OSTI]

of  Spontaneous  Emission  in  a  Semiconductor  nanoLED,”  emission  rate  enhancement  using  the  Fluorescent  Emission  by  Lattice   Resonances  in  

Kumar, Nikhil

2013-01-01T23:59:59.000Z

288

Dust Masses, PAH Abundances, and Starlight Intensities in the SINGS Galaxy Sample  

E-Print Network [OSTI]

Physical dust models are presented for 65 galaxies in the SINGS survey that are strongly detected in the four IRAC bands and three MIPS bands. For each galaxy we estimate (1) the total dust mass, (2) the fraction of the dust mass contributed by PAHs, and (3) the intensity of the starlight heating the dust grains. We find that spiral galaxies have dust properties resembling the dust in the local region of the Milky Way, with similar dust-to-gas ratio, and similar PAH abundance. The observed SEDs, including galaxies with SCUBA photometry, can be reproduced by dust models that do not require "cold" (Tmedia of galaxies with A_O=12+log(O/H)>8.1, grains contain a substantial fraction of interstellar Mg, Si and Fe. Galaxies with A_O8.1 have a median q_PAH=3.55%. The derived dust masses favor a value X_CO approx 4e20 cm^{-2}(K kms)^{-1} for the CO to H_2 conversion factor. Except for some starbursting systems (Mrk33, Tolo89, NGC3049), dust in the diffuse ISM dominates the IR power.

B. T. Draine; D. A. Dale; G. Bendo; K. D. Gordon; J. D. T. Smith; L. Armus; C. W. Engelbracht; G. Helou; R. C. Kennicutt; A. Li; H. Roussel; F. Walter; D. Calzetti; J. Moustakas; E. J. Murphy; G. H. Rieke; C. Bot; D. J. Hollenbach; K. Sheth; H. I. Teplitz

2007-03-09T23:59:59.000Z

289

Emission Abatement System  

DOE Patents [OSTI]

Emission abatement system. The system includes a source of emissions and a catalyst for receiving the emissions. Suitable catalysts are absorber catalysts and selective catalytic reduction catalysts. A plasma fuel converter generates a reducing gas from a fuel source and is connected to deliver the reducing gas into contact with the absorber catalyst for regenerating the catalyst. A preferred reducing gas is a hydrogen rich gas and a preferred plasma fuel converter is a plasmatron. It is also preferred that the absorber catalyst be adapted for absorbing NO.sub.x.

Bromberg, Leslie (Sharon, MA); Cohn, Daniel R. (Chestnut Hill, MA); Rabinovich, Alexander (Swampscott, MA)

2003-05-13T23:59:59.000Z

290

MDF dust/PP composites reinforced with nanoclay: Morphology, long-term physical properties and withdrawal strength of fasteners in dry and saturated conditions  

Science Journals Connector (OSTI)

Abstract In this study, effect of nanoclay loading (0%, 2%, 4% and 6%) on long-term physical properties and withdrawal strength of fasteners before and after saturation of polypropylene/MDF dust composites was investigated. Sanding dust of medium density fiberboard (MDF) was used as lignocellulose material and polypropylene as the thermoplastic material. The results showed that long-term water absorption (WA) and thickness swelling (TS) was found to decrease as the nanoclay loading increased. Also, WA and TS both were increased with increasing MDF dust content. Maximum withdrawal strengths of fasteners (screws and nails) were obtained in the samples reinforced with 2% weight percentages nanoclay. Withdrawal strengths of fasteners in saturated state toward unsaturated state were decreased. In fact, exposure to water for long term was resulted in significant reduction in withdrawal strengths of fasteners due to the degradation of the fiber/matrix interface. The morphological analysis of wood–plastic composite (WPC) samples was carried out by field emission scanning electron microscopy (FE-SEM) to study the fiber/matrix adhesion interactions. X-ray diffraction (XRD) showed the formation of intercalated nanostructure.

Arash Chavooshi; Mehrab Madhoushi; Mohammad Navi; Mohammad Yousef Abareshi

2014-01-01T23:59:59.000Z

291

EPA Emissions | ornl.gov  

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

EPA Emissions ORNL research informs new EPA emissions standards July 11, 2014 Oak Ridge National Laboratory (ORNL) has developed a streamlined method for determining vehicle...

292

Emission Standards for Contaminants (Iowa)  

Broader source: Energy.gov [DOE]

These regulations list emissions standards for various contaminants, and contain special requirements for anaerobic lagoons. These regulations also describe alternative emissions limits, which may...

293

Engines - Emissions Assessment  

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

EPRI Hybrid Electric Vehicle Working Group: HEV Costs and Emissions EPRI Hybrid Electric Vehicle Working Group: HEV Costs and Emissions Hybrid electric vehicles (HEVs) are attractive options for increasing vehicle fuel economy and reducing emissions of criteria pollutants and greenhouse gases. Two automobile manufacturers have already introduced HEVs, and other manufacturers are planning to introduce their own models. One available HEV combines mass reduction (also applicable to conventional vehicles) with idle-stop, regenerative braking, and electric-drive assist to achieve a fuel economy more than 2.5 times the current Corporate Average Fuel Economy (CAFE) standard. The second HEV combines idle-stop, regenerative braking, electric assist acceleration, and continuously variable transmission (CVT) to achieve a fuel economy of more than twice the current CAFÉ standard, qualifying as a super ultra-low emissions vehicle (SULEV).

294

Gas Turbine Emissions  

E-Print Network [OSTI]

Historically, preliminary design information regarding gas turbine emissions has been unreliable, particularly for facilities using steam injection and other forms of Best Available Control Technology (BACT). This was probably attributed to the lack...

Frederick, J. D.

295

Photon enhanced thermionic emission  

DOE Patents [OSTI]

Photon Enhanced Thermionic Emission (PETE) is exploited to provide improved efficiency for radiant energy conversion. A hot (greater than 200.degree. C.) semiconductor cathode is illuminated such that it emits electrons. Because the cathode is hot, significantly more electrons are emitted than would be emitted from a room temperature (or colder) cathode under the same illumination conditions. As a result of this increased electron emission, the energy conversion efficiency can be significantly increased relative to a conventional photovoltaic device. In PETE, the cathode electrons can be (and typically are) thermalized with respect to the cathode. As a result, PETE does not rely on emission of non-thermalized electrons, and is significantly easier to implement than hot-carrier emission approaches.

Schwede, Jared; Melosh, Nicholas; Shen, Zhixun

2014-10-07T23:59:59.000Z

296

Fuel Consumption and Emissions  

Science Journals Connector (OSTI)

Calculating fuel consumption and emissions is a typical offline analysis ... simulations or real trajectory data) and the engine speed (as obtained from gear-shift schemes ... as input and is parameterized by veh...

Martin Treiber; Arne Kesting

2013-01-01T23:59:59.000Z

297

Intelligent field emission arrays  

E-Print Network [OSTI]

Field emission arrays (FEAs) have been studied extensively as potential electron sources for a number of vacuum microelectronic device applications. For most applications, temporal current stability and spatial current ...

Hong, Ching-yin, 1973-

2003-01-01T23:59:59.000Z

298

Carbon Dioxide Emissions  

Science Journals Connector (OSTI)

Abating greenhouse gas (GHG) emissions on a national level involves substantial investment efforts, though part of these may be regained soon.1 On a global level, the costs of the available options are likely to ...

Catrinus J. Jepma; Che Wah Lee

1995-01-01T23:59:59.000Z

299

Dense molecular globulettes and the dust arc towards the runaway O star AE Aur (HD 34078)  

E-Print Network [OSTI]

Some runaway stars are known to display IR arc-like structures around them, resulting from their interaction with surrounding interstellar material. The properties of these features as well as the processes involved in their formation are still poorly understood. We aim at understanding the physical mechanisms that shapes the dust arc observed near the runaway O star AEAur (HD34078). We obtained and analyzed a high spatial resolution map of the CO(1-0) emission that is centered on HD34078, and that combines data from both the IRAM interferometer and 30m single-dish antenna. The line of sight towards HD34078 intersects the outer part of one of the detected globulettes, which accounts for both the properties of diffuse UV light observed in the field and the numerous molecular absorption lines detected in HD34078's spectra, including those from highly excited H2 . Their modeled distance from the star is compatible with the fact that they lie on the 3D paraboloid which fits the arc detected in the 24 {\\mu}m Spitz...

Gratier, P; Boissé, P; Cabrit, S; Lesaffre, P; Gerin, M; Forêts, G Pineau des

2014-01-01T23:59:59.000Z

300

"Dust, Ice, and Gas In Time" (DIGIT) Herschel Observations of GSS30-IRS1 in Ophiuchus  

E-Print Network [OSTI]

As a part of the "Dust, Ice, and Gas In Time" (DIGIT) key program on Herschel, we observed GSS30-IRS1, a Class I protostar located in Ophiuchus (d = 120 pc), with Herschel/Photodetector Array Camera and Spectrometer (PACS). More than 70 lines were detected within a wavelength range from 50 micron to 200 micron, including CO, H2O, OH, and two atomic [O I] lines at 63 and 145 micron. The [C II] line, known as a tracer of externally heated gas by the interstellar radiation field, is also detected at 158 micron. All lines, except [O I] and [C II], are detected only at the central spaxel of 9.4" X 9.4". The [O I] emissions are extended along a NE-SW orientation, and the [C II] line is detected over all spaxels, indicative of external PDR. The total [C II] intensity around GSS30 reveals that the far-ultraviolet radiation field is in the range of 3 to 20 G0, where G0 is in units of the Habing Field, 1.6 X 10^{-3} erg cm^{-2} s^{-1}. This enhanced external radiation field heats the envelope of GSS30-IRS1, causing the...

Je, Hyerin; Lee, Seokho; Green, Joel D; Evans, Neal J

2015-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "fugitive dust emissions" 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

Expanding Shell and Star Formation in the Infrared Dust Bubble N6  

E-Print Network [OSTI]

We have carried out a multi-wavelength study of the infrared dust bubble N6 to extensively investigate the molecular environs and star-forming activities therein. Mapping observations in 12CO J=1-0 and 13CO J=1-0 performed with the Purple Mountain Observatory 13.7-m telescope have revealed four velocity components. Comparison between distributions of each component and the infrared emission suggests that three components are correlated with N6. There are ten molecular clumps detected. Among them, five have reliable detection in both 12CO and 13CO and have similar LTE and non-LTE masses ranging from 200 to higher than 5,000 M_sun. With larger gas masses than virial masses, these five clumps are gravitationally unstable and have potential to collapse to form new stars. The other five clumps are only reliably detected in 12CO and have relatively small masses. Five clumps are located on the border of the ring structure and four of them are elongated along the shell. This is well in agreement with the collect and ...

Yuan, Jing-Hua; Li, Jin Zeng; Liu, Hongli

2014-01-01T23:59:59.000Z

302

Field emission electron source  

DOE Patents [OSTI]

A novel field emitter material, field emission electron source, and commercially feasible fabrication method is described. The inventive field emission electron source produces reliable electron currents of up to 400 mA/cm.sup.2 at 200 volts. The emitter is robust and the current it produces is not sensitive to variability of vacuum or the distance between the emitter tip and the cathode. The novel emitter has a sharp turn-on near 100 volts.

Zettl, Alexander Karlwalter (Kensington, CA); Cohen, Marvin Lou (Berkeley, CA)

2000-01-01T23:59:59.000Z

303

Receptor models: development and testing of such models has moved from the research domain into application to practical problems  

SciTech Connect (OSTI)

Air pollution authorities use models to develop optimal control strategies for air pollutants. According to the traditional approach, emissions inventories for various sources are used as inputs for plume, box, or grid models to predict ambient concentrations of total suspended particulate matter (TSP), SO/sub 2/, or other air pollutants. These methods, however, are inadequate for many purposes today and will be even less useful for many future needs. Even if dispersion models were accurate, the source emissions inventories upon which they rely are not. Source emission inventories, especially for sources equipped with pollution controls, usually do not include contributions from fugitive process emissions and dust. Furthermore, air quality standards are beginning to require knowledge of source of particles in certain size ranges, particles bearing certain toxic substances, or particles that have a special role in problems such as visibility degradation or climate modification.

Gordon, G.E.

1988-10-01T23:59:59.000Z

304

Scavenging of pollutant acid substances by Asian mineral dust particles - article no. L07816  

SciTech Connect (OSTI)

Uptakes of sulfate and nitrate onto Asian dust particles during transport from the Asian continent to the Pacific Ocean were analyzed by using a single-particle time-of-flight mass spectrometer. Observation was conducted at Tsukuba in Japan in the springtime of 2004. Sulfate-rich dust particles made their largest contribution during the 'dust event' in the middle of April 2004. As a result of detailed analysis including backward trajectory calculations, it was confirmed that sulfate components originating from coal combustion in the continent were internally mixed with dust particles. Even in the downstream of the outflow far from the continental coastline, significant contribution of Asian dust to sulfate was observed. Asian dust plays critical roles as the carrier of sulfate over the Pacific Ocean.

Matsumoto, J.; Takahashi, K.; Matsumi, Y.; Yabushita, A.; Shimizu, A.; Matsui, I.; Sugimoto, N. [National Institute of Environmental Science, Ibaraki (Japan)

2006-04-13T23:59:59.000Z

305

Wildland fire emissions, carbon, and climate: Emission factors Shawn Urbanski  

E-Print Network [OSTI]

Wildland fire emissions, carbon, and climate: Emission factors Shawn Urbanski Missoula Fire burning Greenhouse gases Emission factors a b s t r a c t While the vast majority of carbon emitted wildland fire greenhouse gas and aerosol (organic aerosol (OA) and black carbon (BC)) emission inventories

306

A New Facility for Studying Shock Wave Passage over Dust Layers  

E-Print Network [OSTI]

A NEW FACILITY FOR STUDYING SHOCK WAVE PASSAGE OVER DUST LAYERS A Thesis by BRANDON DAVID MARKS Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree... Brandon David Marks ii ABSTRACT To ensure safety regarding dust explosion hazards, it is important to study the dust lifting process experimentally and identify important parameters that will be valuable for development and validation...

Marks, Brandon

2013-05-30T23:59:59.000Z

307

Evolution of a Dust Void in a Radio-Frequency Plasma Sheath  

Science Journals Connector (OSTI)

The onset and growth of a dust void are investigated in a radio-frequency (rf) sheath of a capacitively coupled argon plasma. A circularly symmetric void emerges and grows with increasing rf power and pressure in the central region of the dust cloud levitating in the sheath. Experimental measurements of the void diameter are compared with the predictions of a simple phenomenological theory, based on a balance of forces on dust grains.

R. P. Dahiya; G. V. Paeva; W. W. Stoffels; E. Stoffels; G. M. W. Kroesen; K. Avinash; A. Bhattacharjee

2002-08-27T23:59:59.000Z

308

Water in Emission in the ISO Spectrum of the Early M Supergiant Star mu Cephei  

E-Print Network [OSTI]

We report a detection of water in emission in the spectrum of the M2 supergiant atar mu Cep (M2Ia) observed by the Short Wavelength Spectrometer (SWS) aboard Infrared Space Observatory (ISO) and now released as the ISO Archives. The emission first appears in the 6 micron region (nu2 fundamental) and then in the 40 micron region (pure rotation lines) despite the rather strong dust emission. The intensity ratios of the emission features are far from those of the optically thin gaseous emission. Instead, we could reproduce the major observed emission features by an optically thick water sphere of the inner radius about two stellar radii (1300Rsun), Tex = 1500K, and Ncol (H2O) = 3.0E+20/cm2. This model also accounts for the H2O absorption bands in the near infrared (1.4, 1.9, and 2.7 micron) as well. The detection of water in emission provides strong constraints on the nature of water in the early M supergiant stars, and especially its origin in the outer atmosphere is confirmed against other models such as the large convective cell model. We finally confirm that the early M supergiant star is surrounded by a huge optically thick sphere of the warm water vapor, which may be referred to as MOLsphere for simplicity. Thus, the outer atmosphere of M supergiant stars should have a complicated hierarchical and/or hybrid structure with at least three major constituents including the warm MOLsphere (T about 1.0E+3K) together with the previously known hot chromosphere (T about 1.0E+4K) and cool expanding gas-dust envelope (T about 1.0E+2K).

T. Tsuji

2000-08-03T23:59:59.000Z

309

ITP Materials: Poster - Development of Materials Resistant to Metal Dusting Degradation  

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

metal dusting phenomenon metal dusting phenomenon in simulated process environments ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ ITP Materials, Sensors, and Automation, and Glass Project and Portfolio Review Meeting, June 21-24, Arlington, Virginia. K. Natesan, Z. Zeng, and D. L. Rink Energy Technology Division, Argonne National Laboratory, Argonne, Illinois, 60439 Introduction Metal dusting is a metal loss process that occurs in hot reactive gases The prerequisite for metal dusting is that carbon activity in the gas phase has to be >>1 Metal ends up as fine powder Pitting and crevice attack are common forms

310

E-Print Network 3.0 - alkaline dust impact Sample Search Results  

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

Chem. Phys., 10, 39994012, 2010 www.atmos-chem-phys.net1039992010 Summary: in terms of accumulation of nitrate and sulfate, titration of dust alkalinity, and impact on...

311

Dusts resuspension Test in the STARDUST Facility: Experimental and CFD Analysis.  

E-Print Network [OSTI]

??This thesis is related to the application of the CFD FLUENT code to the dust resuspension tests performed inside the STARDUST (Small Tank for Aerosol… (more)

FREDIANI, FRANCESCO

2009-01-01T23:59:59.000Z

312

Gossypol content of industrial cotton dust: evaluation and application of the Gossypol - Aniline complex method  

E-Print Network [OSTI]

GOSSYPOL CONTENT OF TWO TYPES OF BRACT. ~Pa e Zl RANGE AND ARITHMETIC 'PIEAN OF DUST CONCENTRATIONS IN THE F IVE MAIN PROCESSING OP E RAT I ONS . 27 I ZI. CONCENTRATION OF THREE DUST FRACTIONS AS PERCENTAGE OF '1OTAL DUST CONCENTRATION. . . IV... at a def ? nite conclu- sior that the diseas, is industr'al in origin and due to the inhalation o+ cotton dust. . . The connection of respiratory disease of the type we have been considering with cert:ain forms of occupations concerned...

Gruenwald, Guillermo Jose Samuel

2012-06-07T23:59:59.000Z

313

E-Print Network 3.0 - asthma dust mite Sample Search Results  

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

cell Summary: -cockroach, anti-mouse, and anti-dust mite IgE levels, wheeze, cough, eczema and asthma. Results: Correlations... , maternal asthma, prenatal cockroach...

314

Clementine Observations of the Zodiacal Light and the Dust Content of the Inner Solar System  

E-Print Network [OSTI]

Using the Moon to occult the Sun, the Clementine spacecraft used its navigation cameras to map the inner zodiacal light at optical wavelengths over elongations of 3-30 degrees from the Sun. This surface brightness map is then used to infer the spatial distribution of interplanetary dust over heliocentric distances of about 10 solar radii to the orbit of Venus. We also apply a simple model that attributes the zodiacal light as being due to three dust populations having distinct inclination distributions, namely, dust from asteroids and Jupiter-family comets (JFCs), dust from Halley-type comets, and an isotropic cloud of dust from Oort Cloud comets. The best-fitting scenario indicates that asteroids + JFCs are the source of about 45% of the optical dust cross-section seen in the ecliptic at 1 AU, but that at least 89% of the dust cross-section enclosed by a 1 AU radius sphere is of a cometary origin. When these results are extrapolated out to the asteroid belt, we find an upper limit on the mass of the light-reflecting asteroidal dust that is equivalent to a 12 km asteroid, and a similar extrapolation of the isotropic dust cloud out to Oort Cloud distances yields a mass equivalent to a 30 km comet, although the latter mass is uncertain by orders of magnitude.

J. M. Hahn; H. A. Zook; B. Cooper; B. Sunkara

2002-04-07T23:59:59.000Z

315

E-Print Network 3.0 - absorption features dust Sample Search...  

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

Search Powered by Explorit Topic List Advanced Search Sample search results for: absorption features dust Page: << < 1 2 3 4 5 > >> 1 INFORMATICS The International Journal of...

316

Coal dust exposure among power station workers during normal operations at Hatfield's Ferry Power Station.  

E-Print Network [OSTI]

??Changes in coal composition could produce higher levels of coal dust exposure thanthose found in the past at Hatfield's Ferry Power Station. Air sampling was… (more)

Lewis, Christian S.

2008-01-01T23:59:59.000Z

317

The roles of non-extensivity and dust concentration as bifurcation parameters in dust-ion acoustic traveling waves in magnetized dusty plasma  

SciTech Connect (OSTI)

Dust ion-acoustic traveling waves are studied in a magnetized dusty plasma in presence of static dust and non-extensive distributed electrons in the framework of Zakharov-Kuznesstov-Burgers (ZKB) equation. System of coupled nonlinear ordinary differential equations is derived from ZKB equation, and equilibrium points are obtained. Nonlinear wave phenomena are studied numerically using fourth order Runge-Kutta method. The change from unstable to stable solution and consequently to asymptotic stable of dust ion acoustic traveling waves is studied through dynamical system approach. It is found that some dramatical features emerge when the non-extensive parameter and the dust concentration parameters are varied. Behavior of the solution of the system changes from unstable to stable and stable to asymptotic stable depending on the value of the non-extensive parameter. It is also observed that when the dust concentration is increased the solution pattern is changed from oscillatory shocks to periodic solution. Thus, non-extensive and dust concentration parameters play crucial roles in determining the nature of the stability behavior of the system. Thus, the non-extensive parameter and the dust concentration parameters can be treated as bifurcation parameters.

Narayan Ghosh, Uday; Kumar Mandal, Pankaj, E-mail: pankajwbmsd@gmail.com; Chatterjee, Prasanta [Department of Mathematics, Siksha Bhavana Visva Bharati, Santiniketan, West Bengal 731235 (India)] [Department of Mathematics, Siksha Bhavana Visva Bharati, Santiniketan, West Bengal 731235 (India)

2014-03-15T23:59:59.000Z

318

Constraining Emission Models of Luminous Blazar Sources  

SciTech Connect (OSTI)

Many luminous blazars which are associated with quasar-type active galactic nuclei display broad-band spectra characterized by a large luminosity ratio of their high-energy ({gamma}-ray) and low-energy (synchrotron) spectral components. This large ratio, reaching values up to 100, challenges the standard synchrotron self-Compton models by means of substantial departures from the minimum power condition. Luminous blazars have also typically very hard X-ray spectra, and those in turn seem to challenge hadronic scenarios for the high energy blazar emission. As shown in this paper, no such problems are faced by the models which involve Comptonization of radiation provided by a broad-line-region, or dusty molecular torus. The lack or weakness of bulk Compton and Klein-Nishina features indicated by the presently available data favors production of {gamma}-rays via up-scattering of infrared photons from hot dust. This implies that the blazar emission zone is located at parsec-scale distances from the nucleus, and as such is possibly associated with the extended, quasi-stationary reconfinement shocks formed in relativistic outflows. This scenario predicts characteristic timescales for flux changes in luminous blazars to be days/weeks, consistent with the variability patterns observed in such systems at infrared, optical and {gamma}-ray frequencies. We also propose that the parsec-scale blazar activity can be occasionally accompanied by dissipative events taking place at sub-parsec distances and powered by internal shocks and/or reconnection of magnetic fields. These could account for the multiwavelength intra-day flares occasionally observed in powerful blazars sources.

Sikora, Marek; /Warsaw, Copernicus Astron. Ctr.; Stawarz, Lukasz; /Kipac, Menlo Park /Jagiellonian U., Astron. Observ. /SLAC; Moderski, Rafal; Nalewajko, Krzysztof; /Warsaw, Copernicus Astron. Ctr.; Madejski, Greg; /KIPAC, Menlo Park /SLAC

2009-10-30T23:59:59.000Z

319

Components of mid- and far-infrared emission from S0 and early-type shell galaxies  

SciTech Connect (OSTI)

The IRAS database has been used to study detections of about 150 early-type elliptical and S0 galaxies exhibiting a shell structure. No strong evidence for the expected enhancement of either star formation rates or heating of the interstellar medium is found. It is suggested that for some of the sample galaxies either a contribution from warm dust surrounding evolved stars or emission from an active nucleus may be significant. 40 references.

Thronson, H.A. Jr.; Bally, J.; Hacking, P.

1989-02-01T23:59:59.000Z

320

EIA - Greenhouse Gas Emissions Overview  

Gasoline and Diesel Fuel Update (EIA)

Environment Environment Emissions of Greenhouse Gases in the U. S. Release Date: March 31, 2011 | Next Release Date: Report Discontinued | Report Number: DOE/EIA-0573(2009) Greenhouse Gas Emissions Overview Diagram Notes [a] CO2 emissions related to petroleum consumption (includes 64 MMTCO2 of non-fuel-related emissions). [b] CO2 emissions related to coal consumption (includes 0.3 MMTCO2 of non-fuel-related emissions). [c] CO2 emissions related to natural gas consumption (includes 13 MMTCO2 of non-fuel-related emissions). [d] Excludes carbon sequestered in nonfuel fossil products. [e] CO2 emissions from the plastics portion of municipal solid waste (11 MMTCO2) combusted for electricity generation and very small amounts (0.4 MMTCO2) of geothermal-related emissions.

Note: This page contains sample records for the topic "fugitive dust emissions" 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

GHG emissions | OpenEI  

Open Energy Info (EERE)

GHG emissions GHG emissions Dataset Summary Description These datasets include GHG and CO2 emissions statistics for the European Union (EU). The statistics are available from the European Commission. Source European Commission Date Released Unknown Date Updated Unknown Keywords Biofuels CO2 emissions EU GHG emissions Data application/vnd.ms-excel icon Total GHG and CO2 Emissions for EU (xls, 853.5 KiB) application/vnd.ms-excel icon GHG Emissions by Sector, all member countries (xls, 2 MiB) application/vnd.ms-excel icon GHG Emissions from Transport, all member countries (xls, 1.3 MiB) application/vnd.ms-excel icon CO2 emissions by sector, all member countries (xls, 2.1 MiB) application/vnd.ms-excel icon CO2 emissions by transport, all member countries (xls, 1.5 MiB)

322

THE HERSCHEL AND JCMT GOULD BELT SURVEYS: CONSTRAINING DUST PROPERTIES IN THE PERSEUS B1 CLUMP WITH PACS, SPIRE, AND SCUBA-2  

SciTech Connect (OSTI)

We present Herschel observations from the Herschel Gould Belt Survey and SCUBA-2 science verification observations from the JCMT Gould Belt Survey of the B1 clump in the Perseus molecular cloud. We determined the dust emissivity index using four different techniques to combine the Herschel PACS+SPIRE data at 160-500 {mu}m with the SCUBA-2 data at 450 {mu}m and 850 {mu}m. Of our four techniques, we found that the most robust method was filtering out the large-scale emission in the Herschel bands to match the spatial scales recovered by the SCUBA-2 reduction pipeline. Using this method, we find {beta} Almost-Equal-To 2 toward the filament region and moderately dense material and lower {beta} values ({beta} {approx}> 1.6) toward the dense protostellar cores, possibly due to dust grain growth. We find that {beta} and temperature are more robust with the inclusion of the SCUBA-2 data, improving estimates from Herschel data alone by factors of {approx}2 for {beta} and by {approx}40% for temperature. Furthermore, we find core mass differences of {approx}< 30% compared to Herschel-only estimates with an adopted {beta} = 2, highlighting the necessity of long-wavelength submillimeter data for deriving accurate masses of prestellar and protostellar cores.

Sadavoy, S. I.; Di Francesco, J.; Johnstone, D.; Fallscheer, C.; Matthews, B. [Department of Physics and Astronomy, University of Victoria, P.O. Box 355, STN CSC, Victoria, BC V8W 3P6 (Canada); Currie, M. J.; Jenness, T. [Joint Astronomy Centre, 660 N. A'ohoku Place, University Park, Hilo, HI 96720 (United States); Drabek, E.; Hatchell, J. [School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL (United Kingdom); Nutter, D. [School of Physics and Astronomy, Cardiff University, Queen's Buildings, The Parade, Cardiff CF24 3AA (United Kingdom); Andre, Ph.; Hennemann, M.; Hill, T.; Koenyves, V. [Laboratoire AIM, CEA/DSM-CNRS-Universite Paris Diderot, IRFU/Service d'Astrophysique, Saclay, F-91191 Gif-sur-Yvette (France); Arzoumanian, D. [IAS, CNRS (UMR 8617), Universite Paris-Sud 11, Batiment 121, F-91400 Orsay (France); Benedettini, M. [Istituto di Astrofisica e Planetologia Spaziali, via Fosso del Cavaliere 100, I-00133 Rome (Italy); Bernard, J.-P. [CNRS, IRAP, 9 Av. colonel Roche, BP 44346, F-31028 Toulouse Cedex 4 (France); Duarte-Cabral, A. [Universite de Bordeaux, LAB, UMR 5804, F-33270 Floirac (France); Friesen, R. [Dunlap Institute, University of Toronto, Toronto, ON M5S 3H8 (Canada); Greaves, J. [School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9SS (United Kingdom); Collaboration: JCMT and Herschel Gould Belt Survey teams; and others

2013-04-20T23:59:59.000Z

323

Radioactive contamination of atmospheric dust over southeastern New Mexico  

Science Journals Connector (OSTI)

Aerosol particle samples were collected at three sites located near the Waste Isolation Pilot Plant (WIPP), a deep underground nuclear waste-storage facility, and they were analyzed to investigate the spatial and temporal variations in the concentrations of selected radionuclides and inorganic substances. The activities of 238Pu, 239,240Pu,241Pu and 241Am were determined by alpha spectrometry following a series of chemical separations, and the concentrations of Al, U and Th were determined in a separate set of samples by inductively-coupled plasma mass spectrometry. There was no evidence for impacts of the WIPP on radionuclide activity concentrations. Rather, the activities of both naturally-occurring (U and Th) and man-made (241Am and 239,240Pu) radionuclides in the aerosols peaked in spring and tracked the loadings of Al, an indicator of mineral dust. More than half of the variability in the 239,240Pu at the sampling site closest to the WIPP could be explained by the seasonal cycles of atmospheric dust. For U and Th, the predictive value of Al was even higher: 66% to over 90% of the variance in these nuclides could be explained by their relationship to dust. Extrapolation of the data to a global scale suggests that ?0.02% of the total 239,240Pu from nuclear weapons’ fallout currently recirculates between the earth and atmosphere each year. In terms of monitoring releases from nuclear facilities, the results presented here demonstrate that elemental data provide information directly relevant to understanding causes for variability in the activities of atmospheric radionuclides.

Richard Arimoto; Joel L. Webb; Marsha Conley

2005-01-01T23:59:59.000Z

324

Dust extinction and absorption: the challenge of porous grains  

E-Print Network [OSTI]

In many models of dusty objects in space the grains are assumed to be composite or fluffy. However, the computation of the optical properties of such particles is still a very difficult problem. We analyze how the increase of grain porosity influences basic features of cosmic dust -- interstellar extinction, dust temperature, infrared bands and millimeter opacity. Porous grains can reproduce the flat extinction across the $3 - 8 \\mkm$ wavelength range measured for several lines of sight by {\\it ISO} and {\\it Spitzer}. Porous grains are generally cooler than compact grains. At the same time, the temperature of very porous grains becomes slightly larger in the case of the EMT-Mie calculations in comparison with the results found from the layered-sphere model. The layered-sphere model predicts a broadening of infrared bands and a shift of the peak position to larger wavelengths as porosity grows. In the case of the EMT-Mie model variations of the feature profile are less significant. It is also shown that the millimeter mass absorption coefficients grow as porosity increases with a faster growth occurring for particles with Rayleigh/non-Rayleigh inclusions. As a result, for very porous particles the coefficients given by two models can differ by a factor of about 3. It is found that an increase of porosity leads to an increase of extinction cross sections at some wavelengths and a decrease at others depending on the grain model. However, this behaviour is sufficient to reproduce the extinction curve in the direction of the star $\\sigma$ Sco using current solar abundances. In the case of the star $\\zeta$ Oph our model requires larger amounts of carbon and iron in the dust-phase than is available.

N. V. Voshchinnikov; V. B. Il'in; Th. Henning; D. N. Dubkova

2005-09-11T23:59:59.000Z

325

Simulation of dust streaming in toroidal traps: Stationary flows  

SciTech Connect (OSTI)

Molecular-dynamic simulations were performed to study dust motion in a toroidal trap under the influence of the ion drag force driven by a Hall motion of the ions in E x B direction, gravity, inter-particle forces, and friction with the neutral gas. This article is focused on the inhomogeneous stationary streaming motion. Depending on the strength of friction, the spontaneous formation of a stationary shock or a spatial bifurcation into a fast flow and a slow vortex flow is observed. In the quiescent streaming region, the particle flow features a shell structure which undergoes a structural phase transition along the flow direction.

Reichstein, Torben; Piel, Alexander [IEAP, Christian-Albrechts-Universitaet, D-24098 Kiel (Germany)

2011-08-15T23:59:59.000Z

326

Dust: A major environmental hazard on the earth's moon  

SciTech Connect (OSTI)

On the Earth's Moon, obvious hazards to humans and machines are created by extreme temperature fluctuations, low gravity, and the virtual absence of any atmosphere. The most important other environmental factor is ionizing radiation. Less obvious environmental hazards that must be considered before establishing a manned presence on the lunar surface are the hazards from micrometeoroid bombardment, the nuisance of electro-statically-charged lunar dust, and an alien visual environment without familiar clues. Before man can establish lunar bases and lunar mining operations, and continue the exploration of that planet, we must develop a means of mitigating these hazards. 4 refs.

Heiken, G.; Vaniman, D.; Lehnert, B.

1990-01-01T23:59:59.000Z

327

Pesticides in Dust from Homes in an Agricultural Area  

Science Journals Connector (OSTI)

Shortly after each clinic interview, staff visited their homes and recorded the following: a geographic positioning system (GPS) reading, distance to any agricultural field, number of household residents and rooms, whether residents were farmworkers or worked in agriculture, where work shoes and clothes were kept, and an inventory of pesticide products located in the home, garage, or yard. ... Yet, among dust levels in our study homes, where very few participants stored OPs in the home, chlorpyrifos concentrations were 2?3 fold higher than diazinon concentrations (Table 2). ... Of 112 homes, 58% of residences had crops within 500 m of their home, an intermediate distance for primary drift from aerial and ground applications. ...

Martha E. Harnly; Asa Bradman; Marcia Nishioka; Thomas E. McKone; Daniel Smith; Robert McLaughlin; Geri Kavanagh-Baird; Rosemary Castorina; Brenda Eskenazi

2009-10-30T23:59:59.000Z

328

INJECTION OF SUPERNOVA DUST IN NEARBY PROTOPLANETARY DISKS  

SciTech Connect (OSTI)

The early solar system contained a number of short-lived radionuclides (SLRs) such as {sup 26}Al with half-lives <15 Myr. The one-time presence of {sup 60}Fe strongly suggests that the source of these radionuclides was a nearby supernova. In this paper, we investigate the 'aerogel' model, which hypothesizes that the solar system's SLRs were injected directly into the solar system's protoplanetary disk from a supernova within the same star-forming region. Previous work has shown that disks generally survive the impact of supernova ejecta, but also that little gaseous ejecta can be injected into the disk. The aerogel model hypothesizes that radionuclides in the ejecta condensed into micron-sized dust grains that were injected directly into the solar nebula disk. Here, we discuss the density structure of supernova ejecta and the observational support for dust condensation in the ejecta. We argue that supernova ejecta are clumpy and describe a model to quantify this clumpiness. We also argue that infrared observations may be underestimating the fraction of material that condenses into dust. Building on calculations of how supernova ejecta interact with protoplanetary disks, we calculate the efficiency with which dust grains in the ejecta are injected into a disk. We find that about 70% of material in grains roughly 0.4 {mu}m in diameter can be injected into disks. If ejecta are clumpy, the solar nebula was struck by a clump with higher-than-average {sup 26}Al and {sup 60}Fe, and these elements condensed efficiently into large grains, then the abundances of SLRs in the early solar system can be explained, even if the disk lies 2 pc from the supernova explosion. The probability that all these factors are met is low, perhaps {approx}10{sup -3}-10{sup -2}, and receiving as much {sup 26}Al and {sup 60}Fe as the solar system did may be a rare event. Still, the aerogel model remains a viable explanation for the origins of the radionuclides in the early solar system, and may be the most plausible one.

Ouellette, N. [Department of Physics, Arizona State University, P.O. Box 871504, Tempe, AZ 85287-1504 (United States); Desch, S. J.; Hester, J. J. [School of Earth and Space Exploration, Arizona State University, P.O. Box 871404, Tempe, AZ 85287-1404 (United States)

2010-03-10T23:59:59.000Z

329

Optimal irreversible stimulated emission  

E-Print Network [OSTI]

We studied the dynamics of an initially inverted atom in a semi-infinite waveguide, in the presence of a single propagating photon. We show that atomic relaxation is enhanced by a factor of 2, leading to maximal bunching in the output field. This optimal irreversible stimulated emission is a novel phenomenon that can be observed with state-of-the-art solid-state atoms and waveguides. When the atom interacts with two one-dimensional electromagnetic environments, the preferential emission in the stimulated field can be exploited to efficiently amplify a classical or a quantum state.

D Valente; Y Li; J P Poizat; J M Gerard; L C Kwek; M F Santos; A Auffeves

2012-08-28T23:59:59.000Z

330

Controlled spontaneous emission  

E-Print Network [OSTI]

The problem of spontaneous emission is studied by a direct computer simulation of the dynamics of a combined system: atom + radiation field. The parameters of the discrete finite model, including up to 20k field oscillators, have been optimized by a comparison with the exact solution for the case when the oscillators have equidistant frequencies and equal coupling constants. Simulation of the effect of multi-pulse sequence of phase kicks and emission by a pair of atoms shows that both the frequency and the linewidth of the emitted spectrum could be controlled.

Jae-Seung Lee; Mary A. Rohrdanz; A. K. Khitrin

2007-07-03T23:59:59.000Z

331

EIA - Greenhouse Gas Emissions Overview  

Gasoline and Diesel Fuel Update (EIA)

Greenhouse Gas Tables (1990-2009) Greenhouse Gas Tables (1990-2009) Table Title Formats Overview 1 U.S. emissions of greenhouse gases, based on global warming potential 2 U.S. greenhouse gas intensity and related factors 3 Distribution of total U.S. greenhouse gas emissions by end-use sector 4 World energy-related carbon dioxide emissions by region 5 Greenhouse gases and 100-year net global warming potentials Carbon dioxide emissions 6 U.S. carbon dioxide emissions from energy and industry 7 U.S. energy-related carbon dioxide emissions by end-use sector 8 U.S. carbon dioxide emission from residential sector energy consumption 9 U.S. carbon dioxide emissions from commercial sector energy consumption 10 U.S. carbon dioxide emissions from industrial sector energy consumption

332

Dust Grain-Size Distributions From MRN to MEM  

E-Print Network [OSTI]

Employing the Maximum Entropy Method algorithm, we fit interstellar extinction measurements which span the wavelength range 0.125-3 micron. We present a uniform set of MEM model fits, all using the same grain materials, optical constants and abundance constraints. In addition, we are taking advantage of improved UV and IR data and better estimates of the gas-to-dust ratio. The model fits cover the entire range of extinction properties that have been seen in the Galaxy and the Magellanic Clouds. The grain models employed for this presentation are the simplistic homogeneous spheres models (i.e., Mathis, Rumpl, & Nordsieck 1977) with two (graphite, silicate) or three (graphite, silicate, amorphous carbon) components. Though such usage is only a first step, the results do provide interesting insight into the use of grain size as a diagnostic of dust environment. We find that the SMC Bar extinction curve cannot be fit using carbon grains alone. This is a challenge to the recent observational result indicating little silicon depletion in the SMC.

Geoffrey C. Clayton; Michael J. Wolff; Ulysses J. Sofia; K. D. Gordon; K. A. Misselt

2003-01-24T23:59:59.000Z

333

Acceptable approaches for beneficial use of cement kiln dust  

SciTech Connect (OSTI)

One beneficial use of cement kiln dust (CKD) is application of CKD to cropland as agricultural lime or fertilizer. However, the EPA has expressed a concern over land application of CKD when the metals constituents in the CKD are above the industry-wide median levels presented in EPA`s Report to Congress on Cement Kiln Dust. Under the Clean Water Act, EPA has established limits for metals concentrations in sewage sludge that is applied to the land for beneficial use of the nitrogen in the sludge. The limits for land application of sewage sludge were established based on the results of exposure risk assessments. A comparison of the median industry-wide metals concentrations in CKD to the metals concentration limits for land application of sewage sludge indicates that all trace metal concentrations IN CKD are below the corresponding sewage sludge land application limit, with the exception of the median level of arsenic from one data set. EPA has determined that land application of CKD with metals concentration limits at or below the industry-wide median concentrations does not pose a significant human cancer or non-cancer health risk. Therefore, with appropriate limits, CKD can be beneficially reused for land application on agricultural land in a manner that is protective of human health and the environment.

Schreiber, R.J.; Smeenk, S.D. [Schreiber, Yonley and Associates, St. Louis, MO (United States)

1998-12-31T23:59:59.000Z

334

A new model of composite interstellar dust grains  

E-Print Network [OSTI]

The approach to model composite interstellar dust grains, using the exact solution to the light scattering problem for multi-layered spheres as suggested by Voshchinnikov & Mathis (1999), is further developed. Heterogeneous scatteres are represented by particles with very large number of shells, each including a homogeneous layer per material considered (amorphous carbon, astronomical silicate and vacuum). The applicability of the effective medium theory (EMT) mostly utilized earlier to approximate inhomogeneous interstellar grains is examined on the basis of the new model. It is shown that the EMT rules generally have an accuracy of several percent in the whole range of particle sizes provided the porosity does not exceed about 50%. For larger porosity, the EMT rules give wrong results. Using the model, we reanalyze various basic features of cosmic dust -- interstellar extinction, scattered radiation, infrared radiation, radiation pressure, etc. As an example of the potential of the model, it is applied to reproduce the extinction curves in the directions to $\\zeta$ Oph and $\\sigma$ Sco using subsolar cosmic abundances. We also conclude that metallic iron even in negligible amount ($\\la 1$ % by the volume fraction) is unlikely to form a layer on or inside a grain because of peculiar absorption of radiation by such particles.

N. V. Voshchinnikov; V. B. Il'in; Th. Henning; D. N. Dubkova

2003-03-07T23:59:59.000Z

335

Cancer Mortality and Wood Dust Exposure Among Participants in the American Cancer  

E-Print Network [OSTI]

Cancer Mortality and Wood Dust Exposure Among Participants in the American Cancer Society Cancer and Paolo Boffetta, MD, MPH3 In 1994, the International Agency for Research on Cancer (IARC) classified wood dust as a human carcinogen, based on very strong evidence of a carcinogenic risk of sino-nasal cancer

Salzman, Daniel

336

Dust-raising in the dustiest place on earth Andrew Warren a,, Adrian Chappell b  

E-Print Network [OSTI]

-surface winds and a large exposure of low-density, friable diatomite. Data are reported from three kinds, complemented with reanalysis data, measuring and estimating wind velocities; (b) sun-photometers, measuring on their "horns", is a major contributor to dust production, i.e., the dunes are "dust-mills"; (4) in consequence

Washington, Richard

337

Two evolutional paths of an axisymmetric gravitational instability in the dust layer of a protoplanetary disk  

E-Print Network [OSTI]

Nonlinear numerical simulations are performed to investigate the density evolution in the dust layer of a protoplanetary disk due to the gravitational instability and dust settling toward the midplane. We assume the region where the radial pressure gradient at equilibrium is negligible so that the shear-induced instability is avoided, and also restrict to an axisymmetric perturbation as a first step of nonlinear numerical simulations of the gravitational instability. We find that there are two different evolutional paths of the gravitational instability depending on the nondimensional gas friction time, which is defined as the product of the gas friction time and the Keplerian angular velocity. If the nondimensional gas friction time is equal to 0.01, the gravitational instability grows faster than dust settling. On the other hand, if the nondimensional gas friction time is equal to 0.1, dust aggregates settle sufficiently before the gravitational instability grows. In the latter case, an approximate analytical calculation reveals that dust settling is faster than the growth of the gravitational instability regardless of the dust density at the midplane. Thus, the dust layer becomes extremely thin and may reach a few tenth of the material density of the dust before the gravitational instability grows.

Fumiharu Yamoto; Minoru Sekiya

2006-05-08T23:59:59.000Z

338

Biological response to millennial variability of dust and nutrient supply in the Subantarctic South Atlantic Ocean  

Science Journals Connector (OSTI)

...PS2498-1 with EDC dust fluxes (solid black lines in figure-2...PS2498-1 and TN057-06 were recovered from sites on the eastern flank...nutrients as the primary source to fuel Subantarctic productivity...the EDC dust flux are shown as solid black lines. (c) Flux of...

2014-01-01T23:59:59.000Z

339

Preliminary design of dust lifting and transport in the martian General Circulation Model.  

E-Print Network [OSTI]

by the GCM When wind blows accross a surface covered by loose particles, kinetic energy is transferred Package 4 1 #12; Contents 1 Introduction 2 2 Dust lifting 3 2.1 Lifting by the general circulation winds . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.1.4 Implementation in the GCM. . . . . . . . . . . . . . . . . 6 2.2 Lifting by dust devils

Forget, François

340

Atmospheric Movement of Microorganisms in Clouds of Desert Dust and Implications for Human Health  

Science Journals Connector (OSTI)

...fungal spores in dust storms Sample site (reference) Dust storm source...0-267 (11) 11-43 (23) Kansas (23) Kansas For background, 1.5 min; for...membrane filtration. b Values for the Kansas study are bacterial cells per square...

Dale W. Griffin

2007-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "fugitive dust emissions" 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

DUST TEMPERATURES IN THE INFRARED SPACE OBSERVATORY ATLAS OF BRIGHT SPIRAL GALAXIES1  

E-Print Network [OSTI]

DUST TEMPERATURES IN THE INFRARED SPACE OBSERVATORY ATLAS OF BRIGHT SPIRAL GALAXIES1 George J Space Observatory Atlas of Bright Spiral Galaxies. For the 71 galaxies where we had complete 60­180 lm Facility (IRTF) with IRAS far-infrared data to conclude that spiral galaxies have cold dust components

Joseph, Robert D.

342

Constraining Oceanic dust deposition using surface 1 ocean dissolved Al 2  

E-Print Network [OSTI]

Constraining Oceanic dust deposition using surface 1 ocean dissolved Al 2 Qin Han, J. Keith Moore, Charles Zender, Chris Measures, David Hydes 3 Abstract 4 We use measurements of ocean surface dissolved Al and Deposition 6 (DEAD) model, to constrain dust deposition to the oceans. Our Al database contains 7 all

Zender, Charles

343

Pyrethroids in house dust from the homes of farm worker families in the MICASA study  

E-Print Network [OSTI]

Pyrethroids in house dust from the homes of farm worker families in the MICASA study Kelly J high in homes of immigrant farm worker families, who often live in close proximity to agricultural and pesticide use. We investigate levels of pyrethroids in the house dust of farm worker family homes in a study

Hammock, Bruce D.

344

New ice core evidence for a volcanic cause of the A.D. 536 dust veil  

E-Print Network [OSTI]

New ice core evidence for a volcanic cause of the A.D. 536 dust veil L. B. Larsen,1 B. M. Vinther,1. [1] New and well-dated evidence of sulphate deposits in Greenland and Antarctic ice cores indicate a substantial and extensive atmospheric acidic dust veil at A.D. 533­534 ± 2 years. This was likely produced

Nicolussi, Kurt

345

Laser ignition of dust clouds INERIS, BP. 2, F-60550 Vemeuil-en-Halatte  

E-Print Network [OSTI]

Laser ignition of dust clouds Ch. PROUST INERIS, BP. 2, F-60550 Vemeuil-en-Halatte ineris-00961863.1051/jp4:20020269 #12;Abstract. In a previous paper [1], the possibility of igniting a combustible dust the scope of the investigated ignition phenomena. In particular a relationship between the standard ignition

Paris-Sud XI, Université de

346

Manure Harvesting Frequency: The Key to Feedyard Dust Control in a Summer Drought  

E-Print Network [OSTI]

Summer drought can make dust control in feedyards more challenging than usual. Supplemental water may not keep pace with daily evaporation. The key to dust control is managing the depth of dry manure in the pens by harvesting manure more frequently...

Auvermann, Brent W.; Parker, David B.; Sweeten, John M.

2000-11-27T23:59:59.000Z

347

Dust storms are well known to strongly perturb the state of the  

E-Print Network [OSTI]

Abstract! Dust storms are well known to strongly perturb the state of the lower atmosphere of Mars that MAVEN develop procedures for responding to the onset of a dust storm and explore what assets can provide.J. Solar control of the Mars ionosphere. Planet. Space Sci. 38, 539­542, 1990. and (1) http

Withers, Paul

348

Radon-222, CO, CH4 and Continental Dust over the Greenland and Norwegian Seas  

Science Journals Connector (OSTI)

... The experiment was undertaken to investigate the relationships between these parameters and air mass trajectories. Radon (222Rn)-a radioactive rare gas emanating essentially from large continental land areas-and dust ... removed by coagulation and fallout or washed out by rain or fog, although comparison of radon level and dust data may be helpful in tracing the trajectory and mixing of air ...

R. E. LARSON; R. A. LAMONTAGNE; P. E. WILKNISS; W. I. WITTMANN

1972-12-08T23:59:59.000Z

349

Analysis of the effects of a proposed rule for the enforcement of respirable dust standards  

E-Print Network [OSTI]

The effects of a rule for the enforcement of respirable dust standards proposed by the Mine Safety and Health Administration (MSHA) has been evaluated. Respirable coal dust sample data collected over a three year period by a mining company were used...

Britton, Robert Grant

1996-01-01T23:59:59.000Z

350

Identification of Brominated and Chlorinated Phenols as Potential Thyroid-Disrupting Compounds in Indoor Dusts  

Science Journals Connector (OSTI)

Indoor sources of 2,4,6-TriBPh might be brominated flame retardants currently used in household materials such as electrical appliances. ... Briefly, house dust samples were collected from 19 households (n = 19) and office and laboratory dust samples (hereafter called “office samples”) from three institutions (n = 14) in Japan between May and December 2005. ...

Go Suzuki; Hidetaka Takigami; Mafumi Watanabe; Shin Takahashi; Kazutoshi Nose; Misuzu Asari; Shin-ichi Sakai

2008-01-23T23:59:59.000Z

351

Observational bounds on atmospheric heating by aerosol absorption: Radiative signature of transatlantic dust  

E-Print Network [OSTI]

of transatlantic dust Amit Davidi,1 Alex B. Kostinski,2 Ilan Koren,1 and Yoav Lehahn1,3 Received 14 November 2011: Radiative signature of transatlantic dust, Geo- phys. Res. Lett., 39, L04803, doi:10.1029/2011GL050358. 1

Kostinski, Alex

352

Effect of Electric Arc Furnace Bag House Dust on Concrete Durability Researcher: Fahad Al-Mutlaq  

E-Print Network [OSTI]

Effect of Electric Arc Furnace Bag House Dust on Concrete Durability Researcher: Fahad Al billions of dollars annually. While steel is normally protected from corrosion in concrete by a passive of the effects of addition of Bag House Dust (BHD) on aspects of concrete durability. BHD is a fine powder

Birmingham, University of

353

Evaluating the environmental quality impact of the 2008 Beijing Olympic Games: magnetic monitoring of street dust in Beijing Olympic Park  

Science Journals Connector (OSTI)

......dust; however, domestic combustion processes (mainly coal burning) are...particulates produced by combustion processes such as industrial, domestic...dust; however, domestic combustion processes (mainly coal burning) are......

Qingqing Qiao; Chunxia Zhang; Baochun Huang; John D. A. Piper

2011-12-01T23:59:59.000Z

354

Generation of concentration density maxima of small dispersive coal dust particles in horizontal iodine air filter at air-dust aerosol blow  

E-Print Network [OSTI]

The spatial distributions of the small dispersive coal dust particles with the nano and micro sizes in the granular filtering medium with the cylindrical coal granules in the absorber in the horizontal iodine air filter during its long term operation at the nuclear power plant are researched. It is shown that the concentration density maxima of the small dispersive coal dust particles appear in the granular filtering medium with the cylindrical coal absorbent granules in the horizontal iodine air filter at an action by the air dust aerosol blow. The comparison of the measured aerodynamic resistances of the horizontal and vertical iodine air filters is conducted. The main conclusion is that the magnitude of the aerodynamic resistance of the horizontal iodine air filters is much smaller in comparison with the magnitude of the aerodynamic resistance of the vertical iodine air filters at the same loads of the air dust aerosol volumes. It is explained that the direction of the air dust aerosol blow and the direction of the gravitation force in the horizontal iodine air filter are orthogonal, hence the effective accumulation of the small dispersive coal dust particles takes place at the bottom of absorber in the horizontal iodine air filter. It is found that the air dust aerosol stream flow in the horizontal iodine air filter is not limited by the appearing structures, made of the precipitated small dispersive coal dust particles, in distinction from the vertical iodine air filter, in the process of long term operation of the iodine air filters at the nuclear power plant.

I. M. Neklyudov; O. P. Ledenyov; L. I. Fedorova; P. Ya. Poltinin

2013-06-11T23:59:59.000Z

355

Secondary emission gas chamber  

E-Print Network [OSTI]

For a hadron calorimeter active element there is considered a gaseous secondary emis-sion detector (150 micron gap, 50 kV/cm). Such one-stage parallel plate chamber must be a radiation hard, fast and simple. A model of such detector has been produced, tested and some characteristics are presented.

V. In'shakov; V. Kryshkin; V. Skvortsov

2014-12-10T23:59:59.000Z

356

CARBON DIOXIDE EMISSION REDUCTION  

E-Print Network [OSTI]

.5 Primary Energy Use and Carbon Dioxide Emissions for Selected US Chemical Subsectors in 1994 ...............................................................................................................16 Table 2.7 1999 Energy Consumption and Specific Energy Consumption (SEC) in the U.S. Cement Efficiency Technologies and Measures in Cement Industry.................22 Table 2.9 Energy Consumption

Delaware, University of

357

Graphene Coating Coupled Emission  

E-Print Network [OSTI]

Graphene Coating Coupled Emission A COMSET, A single sheet of sp2-hybridized carbon atoms, called of graphene and its unique properties, I will present amplification of surface graphene-Ag hybrid films which when graphene is used as the spacer layer in a conventional Ag- harnessed the nonlinear properties

Shyamasundar, R.K.

358

Geek-Up[6.24.11]: Dust-sized 'Dragonfly' Device and Tiny Microvalves |  

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

Dust-sized 'Dragonfly' Device and Tiny Dust-sized 'Dragonfly' Device and Tiny Microvalves Geek-Up[6.24.11]: Dust-sized 'Dragonfly' Device and Tiny Microvalves June 24, 2011 - 7:15pm Addthis A computer simulation of the "dragonfly-inspired" device. | Courtesy of Sandia Laboratory A computer simulation of the "dragonfly-inspired" device. | Courtesy of Sandia Laboratory Niketa Kumar Niketa Kumar Public Affairs Specialist, Office of Public Affairs What are the key facts? A dust-size "dragonfly-inspired" device -- which won a Sandia Lab design contest -- may ultimately enable the creation of tiny microvalves for experiments in biological research laboratories and medical facilities. In Sandia National Laboratories' MEMS (microelectromechanical system) University Alliance design contest, a dust-sized dragonfly and a super

359

Biochemical response of Cupressus sempervirens to cement dust: Yields and chemical composition of its essential oil  

Science Journals Connector (OSTI)

Abstract The effects of cement dust on the yield and chemical composition of the essential oil were investigated in Cupressus sempervirens. Exposure to cement dust resulted in significant increase in the essential oil yields. Significant factory distance-related changes in qualitative and quantitative composition of the essential oil were observed. Increasing pollution with dust increased the content of monoterpene hydrocarbons concomitant to increase of ?-pinene, suggesting a redirection of the secondary metabolism of C. sempervirens towards biosynthesis of monoterpenes. By contrast, oxygenated monoterpenes and sesquiterpene hydrocarbons were strongly reduced. These results provide an overall picture of the different response of monoterpenes and sesquiterpenes to air pollution caused by cement dust. They also reveal the suitability of using C. sempervirens in the creation of green areas around cement factories and encourage the use of dusted plants as potential source of valuable natural products.

Karim Hosni; Imed Hassen; Yacine M’Rabet; Hervé Casabianca

2014-01-01T23:59:59.000Z

360

Preliminary analysis of graphite dust releasing behavior in accident for HTR  

SciTech Connect (OSTI)

The behavior of the graphite dust is important to the safety of High Temperature Gas-cooled Reactors. This study investigated the flow of graphite dust in helium mainstream. The analysis of the stresses acting on the graphite dust indicated that gas drag played the absolute leading role. Based on the understanding of the importance of gas drag, an experimental system is set up for the research of dust releasing behavior in accident. Air driven by centrifugal fan is used as the working fluid instead of helium because helium is expensive, easy to leak which make it difficult to seal. The graphite particles, with the size distribution same as in HTR, are added to the experiment loop. The graphite dust releasing behavior at the loss-of-coolant accident will be investigated by a sonic nozzle. (authors)

Peng, W.; Yang, X. Y.; Yu, S. Y.; Wang, J. [Inst. of Nuclear and New Energy Technology, Tsinghua Univ., Beijing100084 (China)

2012-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "fugitive dust emissions" 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

Allocation of emission rights Economic incentives for emission  

E-Print Network [OSTI]

for all countries High cost effectiviness:High cost effectiviness: International Emission trading Fairness NAM Department of Physical Resource Theory #12;Financial flows from emissions trading 450 ppmGDP SAS CPA WEU NAM Department of Physical Resource Theory #12;Financial flows from emissions trading 450

362

Dust density effect on complex plasma decay L. Couedel a,b, A.A. Samarian a  

E-Print Network [OSTI]

and supported by comparison to existing experimental data. Key words: Complex plasma, dust, afterglow, decay (PECVD, etching, fusion reactor,etc). The dust particles are charged due to their interactions, the dust particles can be either grown directly in the plasma chamber (by sputtering [6,7] or using

Paris-Sud XI, Université de

363

Downstream Emissions Trading for Transport  

Science Journals Connector (OSTI)

This chapter addresses the issue of downstream emission trading within the transport sector. It is argued that emission trading may be relevant in this sector, and ... regarding international transport, it is arg...

Charles Raux

2011-01-01T23:59:59.000Z

364

Radionuclide Air Emission Report for 2011  

E-Print Network [OSTI]

470E-20Ì1 Radionuclide Air Emission Report for Prepared by:Environmental Protection Agency, National Emission Standardsfor Emissions of Radionuclides Other Than Radon From

Wahl, Linnea

2012-01-01T23:59:59.000Z

365

GBTL Workshop GHG Emissions | Department of Energy  

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

GHG Emissions GBTL Workshop GHG Emissions EERE Presentation of Greenhouse Gas EmissionsResource Potential gbtlworkshopghgemissions.pdf More Documents & Publications GBTL...

366

Distributed Energy Resources for Carbon Emissions Mitigation  

E-Print Network [OSTI]

Energy Resources for Carbon Emissions Mitigation RyanEnergy Resources for Carbon Emissions Mitigation Ryanand/or site-attributable carbon emissions at commercial and

Firestone, Ryan; Marnay, Chris

2008-01-01T23:59:59.000Z

367

Low emissions diesel fuel  

DOE Patents [OSTI]

A method and matter of composition for controlling NO.sub.x emissions from existing diesel engines. The method is achieved by adding a small amount of material to the diesel fuel to decrease the amount of NO.sub.x produced during combustion. Specifically, small amounts, less than about 1%, of urea or a triazine compound (methylol melamines) are added to diesel fuel. Because urea and triazine compounds are generally insoluble in diesel fuel, microemulsion technology is used to suspend or dissolve the urea or triazine compound in the diesel fuel. A typical fuel formulation includes 5% t-butyl alcohol, 4.5% water, 0.5% urea or triazine compound, 9% oleic acid, and 1% ethanolamine. The subject invention provides improved emissions in heavy diesel engines without the need for major modifications.

Compere, Alicia L. (Knoxville, TN); Griffith, William L. (Oak Ridge, TN); Dorsey, George F. (Farragut, TN); West, Brian H. (Kingston, TN)

1998-01-01T23:59:59.000Z

368

CORONAL EMISSION LINES AS THERMOMETERS  

SciTech Connect (OSTI)

Coronal emission-line intensities are commonly used to measure electron temperatures using emission measure and/or line ratio methods. In the presence of systematic errors in atomic excitation calculations and data noise, the information on underlying temperature distributions is fundamentally limited. Increasing the number of emission lines used does not necessarily improve the ability to discriminate between different kinds of temperature distributions.

Judge, Philip G., E-mail: judge@ucar.ed [High Altitude Observatory, National Center for Atmospheric Research , P.O. Box 3000, Boulder CO 80307-3000 (United States)

2010-01-10T23:59:59.000Z

369

Coronal emission lines as thermometers  

E-Print Network [OSTI]

Coronal emission line intensities are commonly used to measure electron temperatures using emission measure and/or line ratio methods. In the presence of systematic errors in atomic excitation calculations and data noise, the information on underlying temperature distributions is fundamentally limited. Increasing the number of emission lines used does not necessarily improve the ability to discriminate between different kinds of temperature distributions.

Judge, Philip G

2009-01-01T23:59:59.000Z

370

Extended CO emission in the field of the light echo of V838 Mon  

E-Print Network [OSTI]

V838 Mon erupted at the beginning of 2002 becoming an extremely luminous star with L=10^6 L_sun. The outburst was followed by the spectacular light echo that revealed that the star is immersed in a diffuse and dusty medium, plausibly interstellar in nature. Low angular resolution observations in the lowest CO rotational transitions revealed a molecular emission from the direction of V838 Mon. The origin of this CO emission has not been established. In this paper we investigate the idea that the molecular emission originates in the material responsible for the optical light echo. We report on observations of 13 positions within the light echo in the two lowest rotational transitions of CO using the IRAM 30 m telescope. Emission in CO J=1-0 and J=2-1 was detected in three positions. In three other positions only weak J=1-0 lines were found. We conclude that the molecular emission from the direction of V838 Mon is extended and has a complex distribution. We identify the emission as arising from diffuse interstellar clouds and suggest that the CO-bearing gas and the echoing dust are collocated in the same interstellar cloud.

T. Kami?ski

2008-01-10T23:59:59.000Z

371

Planck intermediate results. XXIII. Galactic plane emission components derived from Planck with ancillary data  

E-Print Network [OSTI]

Planck data when combined with ancillary data provide a unique opportunity to separate the diffuse emission components of the inner Galaxy. The purpose of the paper is to elucidate the morphology of the various emission components in the strong star-formation region lying inside the solar radius and to clarify the relationship between the various components. The region of the Galactic plane covered is l=300-0-60deg where star-formation is highest and the emission is strong enough to make meaningful component separation. The latitude widths in this longitude range lie between 1deg and 2deg, which correspond to FWHM z-widths of 100-200pc at a typical distance of 6kpc. The four emission components studied here are synchrotron, free-free, anomalous microwave emission (AME), and thermal (vibrational) dust emission. These components are identified by constructing spectral energy distributions (SEDs) at positions along the Galactic plane using the wide frequency coverage of Planck (28.4-857GHz) in combination with l...

Ade, P A R; Alves, M I R; Arnaud, M; Ashdown, M; Atrio-Barandela, F; Aumont, J; Baccigalupi, C; Banday, A J; Barreiro, R B; Battaner, E; Benabed, K; Benoit-Lévy, A; Bernard, J -P; Bersanelli, M; Bielewicz, P; Bobin, J; Bonaldi, A; Bond, J R; Bouchet, F R; Boulanger, F; Burigana, C; Cardoso, J -F; Catalano, A; Chamballu, A; Chiang, H C; Christensen, P R; Clements, D L; Colombi, S; Colombo, L P L; Combet, C; Couchot, F; Crill, B P; Cuttaia, F; Danese, L; Davies, R D; Davis, R J; de Bernardis, P; de Rosa, A; de Zotti, G; Delabrouille, J; Dickinson, C; Diego, J M; Donzelli, S; Doré, O; Douspis, M; Dupac, X; Efstathiou, G; Enßlin, T A; Eriksen, H K; Finelli, F; Forni, O; Frailis, M; Franceschi, E; Galeotta, S; Ganga, K; Génova-Santos, R T; Ghosh, T; Giard, M; Giardino, G; Giraud-Héraud, Y; González-Nuevo, J; Górski, K M; Gregorio, A; Gruppuso, A; Hansen, F K; Harrison, D L; Henrot-Versillé, S; Herranz, D; Hildebrandt, S R; Hivon, E; Hobson, M; Hornstrup, A; Hovest, W; Huffenberger, K M; Jaffe, A H; Jaffe, T R; Jones, W C; Keihänen, E; Keskitalo, R; Kisner, T S; Kneissl, R; Knoche, J; Kunz, M; Kurki-Suonio, H; Lagache, G; Lähteenmäki, A; Lamarre, J -M; Lasenby, A; Lawrence, C R; Leonardi, R; Liguori, M; Lilje, P B; Linden-Vørnle, M; López-Caniego, M; Lubin, P M; Macías-Pérez, J F; Maino, D; Mandolesi, N; Martin, P G; Martínez-González, E; Masi, S; Massardi, M; Matarrese, S; Mazzotta, P; Meinhold, P R; Melchiorri, A; Mendes, L; Mennella, A; Migliaccio, M; Mitra, S; Miville-Deschênes, M -A; Moneti, A; Montier, L; Morgante, G; Mortlock, D; Munshi, D; Murphy, J A; Naselsky, P; Nati, F; Natoli, P; Nørgaard-Nielsen, H U; Noviello, F; Novikov, D; Novikov, I; Oxborrow, C A; Pagano, L; Pajot, F; Paladini, R; Paoletti, D; Pasian, F; Pearson, T J; Peel, M; Perdereau, O; Perrotta, F; Piacentini, F; Piat, M; Pierpaoli, E; Pietrobon, D; Plaszczynski, S; Pointecouteau, E; Polenta, G; Ponthieu, N; Popa, L; Pratt, G W; Prunet, S; Puget, J -L; Rachen, J P; Reach, W T; Rebolo, R; Reich, W; Reinecke, M; Remazeilles, M; Renault, C; Ricciardi, S; Riller, T; Ristorcelli, I; Rocha, G; Rosset, C; Roudier, G; Rubiño-Martín, J A; Rusholme, B; Sandri, M; Savini, G; Scott, D; Spencer, L D; Stolyarov, V; Strong, A W; Sutton, D; Suur-Uski, A -S; Sygnet, J -F; Tauber, J A; Tavagnacco, D; Terenzi, L; Tibbs, C T; Toffolatti, L; Tomasi, M; Tristram, M; Tucci, M; Valenziano, L; Valiviita, J; Van Tent, B; Varis, J; Vielva, P; Villa, F; Wade, L A; Wandelt, B D; Watson, R; Yvon, D; Zacchei, A; Zonca, A

2014-01-01T23:59:59.000Z

372

Analysis of Emission Shapes  

E-Print Network [OSTI]

Shapes of relative emission sources can be accessed by expanding shapes of correlations at low relative velocities in pair center of mass in Cartesian harmonics. Coefficients of expansion for correlations are related to the respective coefficients of expansion for the sources through one dimensional integral transforms involving properties of pair relative wavefunctions. The methodology is illustrated with analyses of NA49 and PHENIX correlation data.

P. Danielewicz

2007-07-03T23:59:59.000Z

373

Analysis of Emission Shapes  

E-Print Network [OSTI]

Shapes of relative emission sources can be accessed by expanding shapes of correlations at low relative velocities in pair center of mass in Cartesian harmonics. Coefficients of expansion for correlations are related to the respective coefficients of expansion for the sources through one dimensional integral transforms involving properties of pair relative wavefunctions. The methodology is illustrated with analyses of NA49 and PHENIX correlation data.

Danielewicz, P

2007-01-01T23:59:59.000Z

374

Induced and Spontaneous Emission  

Science Journals Connector (OSTI)

The problem of induced and spontaneous emission is investigated for an atomic two?level system with incident beams of radiation which are either in a coherent state or in a stationary state (contain a definite number of photons). The treatment is fully quantum?mechanical and is confined to the case where the frequency spectrum of the incident beam is narrow compared to the natural linewidth of the system. It is shown that under such conditions the spontaneous emission for frequencies within the narrow band of the incident radiation is sharply reduced compared to the prediction of the natural lineshape. It is shown that a hole is burned in the natural lineshape within the narrow frequency band thus effectively quenching the spontaneous emission at some frequency within the band. This effect is shown to occur both for the coherent and stationary beams. Quantities proportional to the induced and spontaneous probability amplitudes and the lifetimes are computed for times comparable to and long compared to the free lifetime of the state. An expression is found for the spectrum of the emergent radiation in terms of these quantities. Its physical meaning is briefly discussed. The density operator of the field for all times is given.

Saul M. Bergmann

1967-01-01T23:59:59.000Z

375

Coal dust contiguity-induced changes in the concentration of TNF- and NF- B p65 on the ocular surface  

SciTech Connect (OSTI)

To observe the influence of coal dust on ocular surface of coal miners and rabbits with coal dust contiguity on expression TNF- and NF- Bp65 and dry eye occurrence. Expression TNF- and NF- Bp65 in ocular surface were determined. Results showed tear production, BUT and lysozyme decreased for coal miners and rabbits with coal dust contiguity. Coal dust exposure was linked to development of xerophthalmia, and induced a higher expression of NF- B p65 and TNF- perhaps as a mechanism to resist coal dust ocular surface injury.

Sun, Z.Y.; Hong, J.; Liu, Z.Y.; Jin, X.D.; Gu, C.H. [China Medical University, Shenyang (China)

2009-07-01T23:59:59.000Z

376

EIA - AEO2010 - Emissions projections  

Gasoline and Diesel Fuel Update (EIA)

Emissions Projections Emissions Projections Annual Energy Outlook 2010 with Projections to 2035 Emissions Projections Figure 93. Carbon dioxide emissions by sector and fuel, 2008 and 2035 Click to enlarge » Figure source and data excel logo Figure 94. Sulfur dioxide emissions from electricity generation, 2000-2035 Click to enlarge » Figure source and data excel logo Figure 95. Nitrogen oxide emissions from electricity generation, 2000-2035 Click to enlarge » Figure source and data excel logo Growth of carbon dioxide emissions slows in the projections Federal and State energy policies recently enacted will stimulate increased use of renewable technologies and efficiency improvements in the future, slowing the growth of energy-related CO2 emissions through 2035. In the Reference case, emissions do not exceed pre-recession 2007 levels until 2025. In 2035, energy-related CO2 emissions total 6,320 million metric tons, about 6 percent higher than in 2007 and 9 percent higher than in 2008 (Figure 93). On average, emissions in the Reference case grow by 0.3 percent per year from 2008 to 2035, compared with 0.7 percent per year from 1980 to 2008.

377

Arbitrary amplitude double layers in warm dust kinetic Alfven wave plasmas  

SciTech Connect (OSTI)

Large amplitude electrostatic structures associated with low-frequency dust kinetic Alfvenic waves are investigated under the pressure (temperature) gradient indicative of dust dynamics. The set of equations governing the dust dynamics, Boltzmann electrons, ions and Maxwell's equation have been reduced to a single equation known as the Sagdeev potential equation. Parameter ranges for the existence of arbitrary amplitude double layers are observed. Exact analytical expressions for the energy integral is obtained and computed numerically through which sub-Alfvenic arbitrary amplitude rarefactive double layers are found to exist.

Gogoi, Runmoni; Devi, Nirupama [Department of Mathematics, Cotton College, Guwahati-781001, Assam (India)

2008-07-15T23:59:59.000Z

378

Evaluating chemical and physical properties of grain dust for use in an explosion hazard indicator  

E-Print Network [OSTI]

0, um P 30. 0 40. 0 50. 0 FIG. l Hlnimum explosive concentration as a function of particle diameter and distance between particles, the highest levels measured at transfer points. From studies at Texas AFM University, Parnell and 8arton (1979... ) found dust levels in wheat and grain sorghum from a terminal elevator vary from 1000 to 5000 grams of dust less than 100 um per metric ton of grain (2 to 10 pounds per ton). Levels of dust in grain sorghum samples collected by Parnell (1981...

Plemons, Dorothy Sue

2012-06-07T23:59:59.000Z

379

Implementation of SB 1368 Emission Performance  

E-Print Network [OSTI]

........................................................................................................ 18 Calculation of Biomass, Biogas or Landfill Net Emissions ..................................... 19

380

Partnerships to continue moving toward zero emissions  

E-Print Network [OSTI]

Partnerships to continue moving toward zero emissions Zero Emission transportation goals Zero Emission MAP makes available technical assistance to states and cities to support the growth of zero emission mobility markets. 1 Research shows

California at Davis, University of

Note: This page contains sample records for the topic "fugitive dust emissions" 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

Generation of concentration density maxima of small dispersive coal dust particles in horizontal iodine air filter at air-dust aerosol blow  

E-Print Network [OSTI]

The spatial distributions of the small dispersive coal dust particles with the nano and micro sizes in the granular filtering medium with the cylindrical coal granules in the absorber in the horizontal iodine air filter during its long term operation at the nuclear power plant are researched. It is shown that the concentration density maxima of the small dispersive coal dust particles appear in the granular filtering medium with the cylindrical coal absorbent granules in the horizontal iodine air filter at an action by the air dust aerosol blow. The comparison of the measured aerodynamic resistances of the horizontal and vertical iodine air filters is conducted. The main conclusion is that the magnitude of the aerodynamic resistance of the horizontal iodine air filters is much smaller in comparison with the magnitude of the aerodynamic resistance of the vertical iodine air filters at the same loads of the air dust aerosol volumes. It is explained that the direction of the air dust aerosol blow and the directi...

Neklyudov, I M; Fedorova, L I; Poltinin, P Ya

2013-01-01T23:59:59.000Z

382

Introduction to Photoelectron Emission Microscopy: Principles...  

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

Introduction to Photoelectron Emission Microscopy: Principles and Applications. Introduction to Photoelectron Emission Microscopy: Principles and Applications. Abstract: In the...

383

Emission control technology  

SciTech Connect (OSTI)

Environmental protection is indispensable for preserving the earth for later generations. Indeed, industrial development has made our life rich; however, it also accelerates environmental pollution. Above all, such global problems as acid rain caused by SOx and NOx emissions and air pollution caused by particulates have become serious in recent years. Countermeasures currently in service or under development for these problems include: upgrading of fuel-burning systems; conversion of energy sources to clean fuels; pretreatment of fuels; and flue gas treatment. This chapter focuses on technologies that treat flue gases including the circumstances of the development of the technologies.

Yamaguchi, Fumihiko

1993-12-31T23:59:59.000Z

384

Positron Emission Tomography (PET)  

DOE R&D Accomplishments [OSTI]

Positron emission tomography (PET) assesses biochemical processes in the living subject, producing images of function rather than form. Using PET, physicians are able to obtain not the anatomical information provided by other medical imaging techniques, but pictures of physiological activity. In metaphoric terms, traditional imaging methods supply a map of the body's roadways, its, anatomy; PET shows the traffic along those paths, its biochemistry. This document discusses the principles of PET, the radiopharmaceuticals in PET, PET research, clinical applications of PET, the cost of PET, training of individuals for PET, the role of the United States Department of Energy in PET, and the futures of PET.

Welch, M. J.

1990-01-00T23:59:59.000Z

385

ApJ, accepted August 18, 2000 Warm Dust Emission Near W75 N IRS1: Evidence for  

E-Print Network [OSTI]

energetics. Out ow parameter estimates that have been corrected for inclination and optical depth imply 1998; Shu et al. 2000) and disk- driven magneto-hydrodynamic wind models (e.g. Cabrit, Ferreira, & Raga, photoevaporation, radiation pressure, and stellar wind ram pressure (Konigl 1999, and references therein). Two

Shepherd, Debra

386

EIA - Greenhouse Gas Emissions Overview  

Gasoline and Diesel Fuel Update (EIA)

1. Greenhouse Gas Emissions Overview 1. Greenhouse Gas Emissions Overview 1.1 Total emissions Total U.S. anthropogenic (human-caused) greenhouse gas emissions in 2009 were 5.8 percent below the 2008 total (Table 1). The decline in total emissions-from 6,983 million metric tons carbon dioxide equivalent (MMTCO2e) in 2008 to 6,576 MMTCO2e in 2009-was the largest since emissions have been tracked over the 1990-2009 time frame. It was largely the result of a 419-MMTCO2e drop in carbon dioxide (CO2) emissions (7.1 percent). There was a small increase of 7 MMTCO2e (0.9 percent) in methane (CH4) emissions, and an increase of 8 MMTCO2e (4.9 percent), based on partial data, in emissions of man-made gases with high global warming potentials (high-GWP gases). (Draft estimates for emissions of HFC and PFC

387

A DISK-WIND MODEL FOR THE NEAR-INFRARED EXCESS EMISSION IN PROTOSTARS  

SciTech Connect (OSTI)

Protostellar systems, ranging from low-luminosity classical T Tauri and Herbig Ae stars to high-luminosity Herbig Be stars, exhibit a near-infrared (NIR) excess in their spectra that is dominated by a bump in the monochromatic luminosity with a peak near 3 {mu}m. The bump can be approximated by a thermal emission component of temperature {approx}1500 K that is of the order of the sublimation temperature of interstellar dust grains. In the currently popular 'puffed-up rim' scenario, the bump represents stellar radiation that propagates through the optically thin inner region of the surrounding accretion disk and is absorbed and reemitted by the dust that resides just beyond the dust sublimation radius r {sub sub}. However, this model cannot account for the strongest bumps measured in these sources, and it predicts a pronounced secondary bounce in the interferometric visibility curve that is not observed. In this paper we present an alternative interpretation, which attributes the bump to reemission of stellar radiation by dust that is uplifted from the disk by a centrifugally driven wind. Winds of this type are a leading candidate for the origin of the strong outflows associated with protostars, and there is observational evidence for disk winds originating on scales {approx}r {sub sub}. Using a newly constructed Monte Carlo radiative transfer code and focusing on low-luminosity sources, we show that this model can account for the NIR excess emission even in bright Herbig Ae stars such as AB Auriga and MWC 275, and that it successfully reproduces the basic features of the visibilities measured in these protostars. We argue that a robust dusty outflow in these sources could be self-limiting-through shielding of the stellar FUV photons-to a relatively narrow launching region between r {sub sub} and {approx}2 r {sub sub}. We also suggest that the NIR and scattered-light variability exhibited by a source like MWC 275 can be attributed in this picture to the uplifting of dust clouds from the disk.

Bans, Alissa; Koenigl, Arieh, E-mail: abans@uchicago.edu, E-mail: akonigl@uchicago.edu [Department of Astronomy and Astrophysics and Enrico Fermi Institute, University of Chicago, Chicago, IL 60637 (United States)

2012-10-20T23:59:59.000Z

388

Three-dimensional dust-ion-acoustic rogue waves in a magnetized dusty pair-ion plasma with nonthermal nonextensive electrons and opposite polarity dust grains  

SciTech Connect (OSTI)

Dust-ion-acoustic (DIA) rogue waves are investigated in a three-dimensional magnetized plasma containing nonthermal electrons featuring Tsallis distribution, both positive and negative ions, and immobile dust grains having both positive and negative charges. Via the reductive perturbation method, a (3?+?1)-dimensional nonlinear Schrödinger (NLS) equation is derived to govern the dynamics of the DIA wave packets. The modulation instability of DIA waves described by the (3?+?1)-dimensional NLS equation is investigated. By means of the similarity transformation and symbolic computation, both the first- and second-order rogue wave solutions of the (3?+?1)-dimensional NLS equation are constructed in terms of rational functions. Moreover, the dynamics properties and the effects of plasma parameters on the nonlinear structures of rogue waves are discussed in detail. The results could be useful for understanding the physical mechanism of rogue waves in laboratory experiments where pair-ion plasmas with electrons and dust grains can be found.

Guo, Shimin, E-mail: gsm861@126.com; Mei, Liquan, E-mail: lqmei@mail.xjtu.edu.cn [School of Mathematics and Statistics, Xi'an Jiaotong University, Xi'an 710049 (China)

2014-08-15T23:59:59.000Z

389

Brownleeite: A new manganese silicide mineral in an interplanetary dust particle  

Science Journals Connector (OSTI)

...NASA has been routinely collecting IDPs and has maintained the Cosmic Dust Curatorial Facility (containing a class 10-100 cleanroom) at Johnson Space Center (Warren and Zolensky 1993). The particles described here were individually removed from the collectors...

Keiko Nakamura-Messenger; Lindsay P. Keller; Simon J. Clemett; Scott Messenger; John H. Jones; Russell L. Palma; Robert O. Pepin; Wolfgang Klöck; Michael E. Zolensky; Hirokazu Tatsuoka

390

Laboratory Measurements of Contact Freezing by Dust and Bacteria at Temperatures of Mixed-Phase Clouds  

Science Journals Connector (OSTI)

Laboratory measurements of freezing by aerosol particles in contact mode are presented. The fraction of particles catalyzing freezing is quantified for three mineral dusts and three strains of bacteria. This is the most comprehensive such dataset ...

Joseph Niehaus; Jennifer G. Becker; Alexander Kostinski; Will Cantrell

2014-10-01T23:59:59.000Z

391

Microsoft PowerPoint - 16_Sahara.dust.min.20070326.ppt [Compatibility...  

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

Area Convective Rain Stratiform Rain advection Saharan dusts act as ice forming nuclei to produce more, small size cloud ice particle, but unable to grow up to PR detectable ice...

392

Chirality in interstellar dust and in comets: Life from dead stars  

Science Journals Connector (OSTI)

Interstellar dust grains have mantles of prebiotic organic molecules. A large fraction of the clouds of interstellar dust grains pass close enough to neutron stars for the circularly polarized ultraviolet radiation to produce a 10% or higher enantiomeric excess in the organic grain mantles. The time between such close passages is about ten times larger than the average lifetime of the molecular clouds so that the most prestellar and protostellar clouds contain predominantly left or right handed prebiotic molecules. Comets as agglomerated interstellar dust preserve the initial enantiomeric excess. Even if only 0.1% of the comet material survives as small comet dust particles which preserve their prebiotic molecules there could be ?10251 chances for life to originate from one of these if it lands in water.

J. Mayo Greenberg

1996-01-01T23:59:59.000Z

393

The Development of Measurement Techniques to Identify and Characterize Dusts and Ice Nuclei in the Atmosphere  

E-Print Network [OSTI]

nucleation mechanisms. The work presented here discusses new instrumentation and methods to measure and identify both the optical scattering properties and ice nucleation properties of atmospherically relevant dusts. The Texas A&M University Continuous Flow...

Glen, Andrew

2014-01-15T23:59:59.000Z

394

Photographic observations of comet Hale-Bopp at the Pulkovo Observatory: The detection of dust envelopes  

Science Journals Connector (OSTI)

The photographic observations of comet Hale-Bopp with the 26-inch Pulkovo Observatory ... in March–April, 1998, revealed three hemispherical gas-dust envelopes and one spiral jet in...

Yu. N. Gnedin; A. A. Kiselev; T. P. Kiseleva; K. L. Maslennikov

2001-04-01T23:59:59.000Z

395

Measurements of Saharan Dust in Convective Clouds over the Tropical Eastern Atlantic Ocean  

Science Journals Connector (OSTI)

Mineral dust particles have been shown to act as cloud condensation nuclei, and they are known to interact with developing tropical storms over the Atlantic downwind of the Sahara. Once present within liquid droplets, they have the potential to ...

Cynthia H. Twohy

396

ACE-ASIA: Regional Climatic and Atmospheric Chemical Effects of Asian Dust and Pollution  

Science Journals Connector (OSTI)

Although continental-scale plumes of Asian dust and pollution reduce the amount of solar radiation reaching the earth's surface and perturb the chemistry of the atmosphere, our ability to quantify these effects has been limited by a lack of ...

John H. Seinfeld; Gregory R. Carmichael; Richard Arimoto; William C. Conant; Frederick J. Brechtel; Timothy S. Bates; Thomas A. Cahill; Antony D. Clarke; Sarah J. Doherty; Piotr J. Flatau; Barry J. Huebert; Jiyoung Kim; Krzysztof M. Markowicz; Patricia K. Quinn; Lynn M. Russell; Philip B. Russell; Atsushi Shimizu; Yohei Shinozuka; Chul H. Song; Youhua Tang; Itsushi Uno; Andrew M. Vogelmann; Rodney J. Weber; Jung-Hun Woo; Xiao Y. Zhang

2004-03-01T23:59:59.000Z

397

Assessment of DDT and DDE Levels in Soil, Dust, and Blood Samples From Chihuahua, Mexico  

Science Journals Connector (OSTI)

The aim of this study was to assess levels of DDT and DDE in two environmental matrices (soil and dust) and to investigate the blood levels of these insecticides in exposed children living in a north Mexican stat...

Fernando Díaz-Barriga Martínez…

2012-02-01T23:59:59.000Z

398

E-Print Network 3.0 - air-borne dust conditions Sample Search...  

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

L., Guo, J., Dan, M., Zhang, W., Wang, Z., and Hao, Z.: The air-borne particulate pollution... Discussions Regional characteristics of spring Asian dust and its impact on...

399

Tracing dust provenance, cycling, and history in the Wasatch Mountains using strontium isotopes and tree rings.  

E-Print Network [OSTI]

??To further our understanding of dust cycling from the Great Basin to the Rocky Mountains, this study uses strontium concentrations and isotopes (87Sr/86Sr) to investigate… (more)

Miller, Olivia Leigh

2013-01-01T23:59:59.000Z

400

Analysis of degrees of loading of dust catchers at compressor stations of trunk gas pipelines  

Science Journals Connector (OSTI)

Static and cyclic stresses in areas of welding of dust catcher pipes are analyzed. To determine stresses, strains in the apparatus body in natural conditions were measured and the most loaded areas of the stru...

O. A. Priimak; E. I. Mamaeva; I. M. Rafalovich…

2005-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "fugitive dust emissions" 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

Of horseshoes and heliotropes: Dynamics of dust in the Encke Gap M.M. Hedman a,  

E-Print Network [OSTI]

Of horseshoes and heliotropes: Dynamics of dust in the Encke Gap M.M. Hedman a, , J.A. Burns a located within the Cassini Division's Laplace Gap demonstrates ``heliotropic'' behavior: its geometric

Hamilton, Douglas P.

402

Trajectory Analysis of Saudi Arabian Dust Storms 1 Michael Notaro 3  

E-Print Network [OSTI]

1 Trajectory Analysis of Saudi Arabian Dust Storms 1 2 Michael-Atmospheres 11 12 Abstract 13 14 Temporal and spatial characteristics of Saudi, are investigated using station and gridded weather 16 observations and remotely

Wisconsin at Madison, University of

403

Zero emission coal  

SciTech Connect (OSTI)

We discuss a novel, emission-free process for producing hydrogen or electricity from coal. Even though we focus on coal, the basic design is compatible with any carbonaceous fuel. The process uses cyclical carbonation of calcium oxide to promote the production of hydrogen from carbon and water. The carbonation of the calcium oxide removes carbon dioxide from the reaction products and provides the additional energy necessary to complete hydrogen production without additional combustion of carbon. The calcination of the resulting calcium carbonate is accomplished using the high temperature waste heat from solid oxide fuel cells (SOFC), which generate electricity from hydrogen fuel. Converting waste heat back to useful chemical energy allows the process to achieve very high conversion efficiency from fuel energy to electrical energy. As the process is essentially closed-loop, the process is able to achieve zero emissions if the concentrated exhaust stream of CO{sub 2} is sequestered. Carbon dioxide disposal is accomplished by the production of magnesium carbonate from ultramafic rock. The end products of the sequestration process are stable naturally occurring minerals. Sufficient rich ultramafic deposits exist to easily handle all the world's coal.

Ziock, H.; Lackner, K.

2000-08-01T23:59:59.000Z

404

Elastic emission polishing  

SciTech Connect (OSTI)

Elastic emission polishing, also called elastic emission machining (EEM), is a process where a stream of abrasive slurry is used to remove material from a substrate and produce damage free surfaces with controlled surface form. It is a noncontacting method utilizing a thick elasto-hydrodynamic film formed between a soft rotating ball and the workpiece to control the flow of the abrasive. An apparatus was built in the Center, which consists of a stationary spindle, a two-axis table for the workpiece, and a pump to circulate the working fluid. The process is controlled by a programmable computer numerical controller (CNC), which presently can operate the spindle speed and movement of the workpiece in one axis only. This apparatus has been used to determine material removal rates on different material samples as a function of time, utilizing zirconium oxide (ZrO{sub 2}) particles suspended in distilled water as the working fluid. By continuing a study of removal rates the process should become predictable, and thus create a new, effective, yet simple tool for ultra-precision mechanical machining of surfaces.

Loewenthal, M.; Loseke, K.; Dow, T.A.; Scattergood, R.O.

1988-12-01T23:59:59.000Z

405

Dust-to-gas ratio, $X_{\\rm CO}$ factor and CO-dark gas in the Galactic anticentre: an observational study  

E-Print Network [OSTI]

We investigate the correlation between extinction and H~{\\sc i} and CO emission at intermediate and high Galactic latitudes ($|b|>10\\degr$) within the footprint of the Xuyi Schmidt Telescope Photometric Survey of the Galactic anticentre (XSTPS-GAC) on small and large scales. In Paper I (Chen et al. 2014), we present a three-dimensional dust extinction map within the footprint of XSTPS-GAC, covering a sky area of over 6,000\\,deg$^2$ at a spatial angular resolution of 6\\,arcmin. In the current work, the map is combined with data from gas tracers, including H~{\\sc i} data from the Galactic Arecibo L-band Feed Array H~{\\sc i} survey and CO data from the Planck mission, to constrain the values of dust-to-gas ratio $DGR=A_V/N({\\rm H})$ and CO-to-$\\rm H_2$ conversion factor $X_{\\rm CO}=N({\\rm H_2})/W_{\\rm CO}$ for the entire GAC footprint excluding the Galactic plane, as well as for selected star-forming regions (such as the Orion, Taurus and Perseus clouds) and a region of diffuse gas in the northern Galactic hemis...

Chen, B -Q; Yuan, H -B; Huang, Y; Xiang, M -S

2015-01-01T23:59:59.000Z

406

Dust suppression results using mineral oil applications on corn and milo  

E-Print Network [OSTI]

DUST SUPPRESSION RESULTS USING MINERAL OIL APPLICATIONS ON CORN AND MILO A Thesis by HERMAN DOUGLAS WARDLAW, JR. Submitted to the Graduate College of Texas AkM University in partial fulfillment of the requirements for the degree of MASTER... OF SCIENCE August 1987 Major Subject: Agricultural Engineering DUST SUPPRESSION RESULTS USING MINERAL OIL APPLICATIONS ON CORN AND MILO A Thesis by HERMAN DOUGLAS WARDLAW, JR. Approved as to style and content by: Calvin B. Parnell, Jr. (Chairman...

Wardlaw, Herman Douglas

2012-06-07T23:59:59.000Z

407

www.sea.co.uk a Cohort plc company L-DAP Lunar Dust Analysis Package  

E-Print Network [OSTI]

www.sea.co.uk a Cohort plc company L-DAP Lunar Dust Analysis Package Study Overview ESTEC Contract.sea.co.uk a Cohort plc company Dust Problems.. · "I think probably the most aggravating, restricting facets of lunar #12;www.sea.co.uk a Cohort plc company Lunar South Pole ... L-DAP Overview 28th Oct 2011 · South Pole

Anand, Mahesh

408

Squalene and Cholesterol in Dust from Danish Homes and Daycare Centers  

Science Journals Connector (OSTI)

Squalene and Cholesterol in Dust from Danish Homes and Daycare Centers ... The mass fractions of squalene in dust were approximately log-normally distributed (homes: GM = 32 ?g/g, GSD = 4.3; daycare centers: GM = 11.5 ?g/g, GSD = 4.3); those of cholesterol displayed a poorer fit to such a distribution (homes: GM = 625 ?g/g, GSD = 3.4; daycare centers: GM = 220 ?g/g, GSD = 4.0). ...

Charles J. Weschler; Sarka Langer; Andreas Fischer; Gabriel Bekö; Jørn Toftum; Geo Clausen

2011-04-08T23:59:59.000Z

409

Three-dimensional Reconstruction of Dust Particle Trajectories in the NSTX  

SciTech Connect (OSTI)

Highly mobile incandescent dust particles are routinely observed on NSTX using two fast cameras operating in the visible region. An analysis method to reconstruct dust particle trajectories in space using two fast cameras is presented in this paper. Position accuracies of a few millimeters depending on the particle's location have been achieved and particle velocities between 10 and 200 m/s have been observed. 2008 American Institute of Physics. __________________________________________________

W.U. Boeglin, A.L. Roquemore, and R. Maqueda

2009-03-06T23:59:59.000Z

410

Three-dimensional reconstruction of dust particle trajectories in the NSTX  

SciTech Connect (OSTI)

Highly mobile incandescent dust particles are routinely observed on NSTX using two fast cameras operating in the visible region. An analysis method to reconstruct dust particle trajectories in space using two fast cameras is presented in this paper. Position accuracies of a few millimeters depending on the particle's location have been achieved and particle velocities between 10 and 200 m/s have been observed.

Boeglin, W. U. [Physics Department, Florida International University, 11200 SW 8th Street, Miami, Florida 33199 (United States); Roquemore, A. L. [Princeton Plasma Physics Laboratory, James Forrestal Campus, Rt. 1 N at Sayre Dr., Princeton, New Jersey 08543 (United States); Maqueda, R. [NOVA Photonics, P.O. Box 451, Princeton, New Jersey 08543-0451 (United States)

2008-10-15T23:59:59.000Z

411

Just the Basics: Vehicle Emissions  

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

Are Exhaust Are Exhaust Emissions? In most heavily settled areas of the U.S., the personal automobile is the single greatest producer of harmful vehicle exhaust emissions. Exhaust emissions are generated by the fuel-air mixture burning in internal combus- tion engines, both gasoline-powered and diesel-powered. Emissions are also produced by fuel evaporation within the vehicle when it is stopped, and again during fueling. The constituents of car (gasoline and diesel) and truck (diesel) emissions vary depending on fuel type and indi- vidual vehicle operating characteris- tics. The bulk of vehicular emissions are composed of water vapor, carbon dioxide, nitrogen, and oxygen (in unconsumed air). There are other pollutants, such as carbon monoxide, nitrogen oxides, unburned fuel, and

412

Heart of Darkness: dust obscuration of the central stellar component in globular clusters younger than ~100Myr in multiple stellar population models  

E-Print Network [OSTI]

To explain the observed anomalies in stellar populations within globular clusters, many globular cluster formation theories require two independent episodes of star formation. A fundamental prediction of these models is that the clusters must accumulate large gas reservoirs as the raw material to form the second stellar generation. We show that young clusters containing the required gas reservoir should exhibit the following observational signatures: (i) a dip in the measured luminosity profile or an increase in measured reddening towards the cluster centre, with Av >10mag within a radius of a few pc; (ii) bright (sub)mm emission from dust grains; (iii) bright molecular line emission once the gas is dense enough to begin forming stars. Unless the IMF is anomalously skewed towards low-mass stars, the clusters should also show obvious signs of star formation via optical emission lines (e.g. H_alpha) after the stars have formed. These observational signatures should be readily observable towards any compact clus...

Longmore, Steven N

2015-01-01T23:59:59.000Z

413

Silicon carbide absorption features: dust formation in the outflows of extreme carbon stars  

E-Print Network [OSTI]

Infrared carbon stars without visible counterparts are generally known as extreme carbon stars. We have selected a subset of these stars with absorption features in the 10-13 $\\mu$m range, which has been tentatively attributed to silicon carbide (SiC). We add three new objects meeting these criterion to the seven previously known, bringing our total sample to ten sources. We also present the result of radiative transfer modeling for these stars, comparing these results to those of previous studies. In order to constrain model parameters, we use published mass-loss rates, expansion velocities and theoretical dust condensation models to determine the dust condensation temperature. These show that the inner dust temperatures of the dust shells for these sources are significantly higher than previously assumed. This also implies that the dominant dust species should be graphite instead of amorphous carbon. In combination with the higher condensation temperature we show that this results in a much higher acceleration of the dust grains than would be expected from previous work. Our model results suggest that the very optically thick stage of evolution does not coincide with the timescales for the superwind, but rather, that this is a very short-lived phase. Additionally, we compare model and observational parameters in an attempt to find any correlations. Finally, we show that the spectrum of one source, IRAS 17534$-$3030, strongly implies that the 10-13 $\\mu$m feature is due to a solid state rather than a molecular species.

Angela K. Speck; Adrian B. Corman; Kristina Wakeman; Caleb H. Wheeler; Grant Thompson

2008-10-15T23:59:59.000Z

414

Laboratory investigation of the dust explosibility characteristics of three Nova Scotia coals  

Science Journals Connector (OSTI)

The explosion characteristics of coal dust/air and methane/coal dust/air mixtures have been determined experimentally. All tests were conducted at initial pressures of nominally 1.0 bar in a 26 / spherical explosion bomb. Run-of-mine coal from the Prince, Lingan and Phalen seams of the Cape Breton Development Corporation was used. Two size fractions of each coal were tested at dust concentrations ranging from the lean flammability limit to 1.0 kg m?3. The explosion parameters measured for each test were the maximum explosion pressure, Pmax, and the maximum rate of pressure rise, (dP/dt)max. Methane addition to the coal dust/air mixtures was found to increase both Pmax and (dP/dt)max, the effect being most significant at low dust concentrations. A reduction in mass mean diameter of the coal or an increase in the parent coal volatile content was found to have a similar effect on Pmax and (dP/dt)max. These observations are consistent with a description of coal dust flame propagation by gas-phase combustion of devolatilization products.

Paul R. Amyotte; Kenneth J. Mintz; Michael J. Pegg; Yu-Hong Sun; Kenneth I. Wilkie

1991-01-01T23:59:59.000Z

415

The effect of a dust size distribution on electrostatic sheaths in unmagnetized dusty plasmas  

SciTech Connect (OSTI)

In this work, the structure of plasma sheaths in presence of dust particles with different sizes is investigated numerically in a multifluid framework, where the dust size distribution is modeled by Gauss' law. For this, we have established a 1D, stationary, unmagnetized, and weakly collisional electronegative dusty plasma sheath model. The electrons and negative ions are considered in a local thermodynamic equilibrium, therefore, described by a Boltzmann distribution. On the other hand, positive ions and dust grains are described by fluid equations. The charging process is described by the orbit motion limited model. It is shown that taking into account dust grains with different sizes reduces considerably the sheath thickness. The behavior of dust surface potential is not affected, but the dust charge number is reduced, as well as the electrostatic force. It results in a decrease of layered structure. The presence of negative ions makes the structure of the electrostatic potential more oscillatory. The other physical parameters are also analyzed and discussed.

Benlemdjaldi, D. [Quantum Electronics Laboratory, Faculty of Physics, U.S.T.H.B. BP 32 El-Alia Bab-Ezzouar, Algiers 16111 (Algeria); Departement de Physique, Ecole Normale Superieure BP 92 Vieux-Kouba, Algiers 16050 (Algeria); Tahraoui, A. [Quantum Electronics Laboratory, Faculty of Physics, U.S.T.H.B. BP 32 El-Alia Bab-Ezzouar, Algiers 16111 (Algeria); Hugon, R.; Bougdira, J. [Institut Jean Lamour, Departement CP2S UMR 7198 CNRS, Universite de Lorraine, BP 70239, 54506 Vandoeuvre-les-Nancy cedex (France)

2013-04-15T23:59:59.000Z

416

Proper motions of new dust in the colliding-wind binary WR 140  

E-Print Network [OSTI]

The eccentric WR+O binary system WR 140 produces dust for a few months at intervals of 7.94 yrs coincident with periastron passage. We present the first resolved images of this dust shell, at binary phases ~0.039 and ~0.055, using aperture masking techniques on the Keck-I telescope to achieve diffraction-limited resolution. Proper motions of approximately 1.1 milliarcsecond per day were detected, implying a distance ~1.5 kpc from the known wind speed. The dust plume observed is not as simple as the ``pinwheel'' nebulae seen around other WR colliding wind binaries, indicating the orbital plane is highly inclined to our line-of-sight and/or the dust formation is very clumpy. Follow-up imaging in the mid-infrared and with adaptive optics is urgently required to track the dust motion further, necessary for unambiguously determining the orbital geometry which we only partially constrain here. With full knowledge of the orbital elements, these infrared images can be used to reconstruct the dust distribution along t...

Monnier, J D; Danchi, W C

2002-01-01T23:59:59.000Z

417

Proper motions of new dust in the colliding-wind binary WR 140  

E-Print Network [OSTI]

The eccentric WR+O binary system WR 140 produces dust for a few months at intervals of 7.94 yrs coincident with periastron passage. We present the first resolved images of this dust shell, at binary phases ~0.039 and ~0.055, using aperture masking techniques on the Keck-I telescope to achieve diffraction-limited resolution. Proper motions of approximately 1.1 milliarcsecond per day were detected, implying a distance ~1.5 kpc from the known wind speed. The dust plume observed is not as simple as the ``pinwheel'' nebulae seen around other WR colliding wind binaries, indicating the orbital plane is highly inclined to our line-of-sight and/or the dust formation is very clumpy. Follow-up imaging in the mid-infrared and with adaptive optics is urgently required to track the dust motion further, necessary for unambiguously determining the orbital geometry which we only partially constrain here. With full knowledge of the orbital elements, these infrared images can be used to reconstruct the dust distribution along the colliding wind interface, providing a unique tool for probing the post-shock physical conditions of violent astrophysical flows.

J. D. Monnier; P. G. Tuthill; W. C. Danchi

2002-02-16T23:59:59.000Z

418

Fuel Mix and Emissions Disclosure  

Broader source: Energy.gov [DOE]

As part of the state's 1997 electric utility restructuring legislation, Illinois established provisions for the disclosure of fuel mix and emissions data. All electric utilities and alternative...

419

Fuel Mix and Emissions Disclosure  

Broader source: Energy.gov [DOE]

Oregon's 1999 electric utility restructuring legislation requires electricity companies and electric service suppliers to disclose details regarding their fuel mix and emissions of electric...

420

Emissions trading under market imperfections.  

E-Print Network [OSTI]

??In this thesis we consider emissions trading under various market imperfections such as uncertainty over permit price, imperfect competition and noncompliance. First, we study the… (more)

Lappi, Pauli

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "fugitive dust emissions" 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

field emission electron microprobe | EMSL  

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

field emission electron microprobe Leads No leads are available at this time. Magnesium behavior and structural defects in Mg+ ion implanted silicon carbide. Abstract: As a...

422

EMSL - field emission electron microprobe  

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

field-emission-electron-microprobe en Magnesium behavior and structural defects in Mg+ ion implanted silicon carbide. http:www.emsl.pnl.govemslwebpublications...

423

Acoustic emission during polymer crystallization  

Science Journals Connector (OSTI)

... .G.; part support to L.K.) Acoustic Emission, Special Technical Publication 505, ASTM, Philadelphia, 1971; Grabec, I. & Peterlin, A. J. Polymer Sci. ...

A. Galeski; L. Koenczoel; E. Piorkowska; E. Baer

1987-01-01T23:59:59.000Z

424

Brownian Motion of Stars, Dust, and Invisible Matter  

E-Print Network [OSTI]

Treating the motion of a dust particle suspended in a liquid as a random walk, Einstein in 1905 derived an equation describing the diffusion of the particle's probability distribution in configuration space. Fokker and Planck extended this work to describe the velocity distribution of the particles. Their equation and its solutions have been applied to many problems in nature starting with the motion of Brownian particles in a liquid. Chandrasekhar derived the Fokker-Planck equation for stars and showed that long-range gravitational encounters provide a drag force, dynamical friction, which is important in the evolution of star clusters and the formation of galaxies. In certain circumstances, Fokker-Planck evolution also describes the evolution of dark (invisible) matter in the universe. In the early universe, the thermal decoupling of weakly interacting massive particles from the plasma of relativistic leptons and photons is governed by Fokker-Planck evolution. The resulting dissipation imprints a minimum length scale for cosmic density fluctuations. Still later, these density fluctuations produce stochastic gravitational forces on the dark matter as it begins to cluster under gravity. The latter example provides an exact derivation of the Fokker-Planck equation without the usual assumption of Markovian dynamics.

Edmund Bertschinger

2006-08-28T23:59:59.000Z

425

Brownian Motion of Stars, Dust, and Invisible Matter  

Science Journals Connector (OSTI)

Treating the motion of a dust particle suspended in a liquid as a random walk Einstein in 1905 derived an equation describing the diffusion of the particle’s probability distribution in configuration space. Fokker and Planck extended this work to describe the velocity distribution of the particles. Their equation and its solutions have been applied to many problems in nature starting with the motion of Brownian particles in a liquid. Chandrasekhar derived the Fokker?Planck equation for stars and showed that long?range gravitational encounters provide a drag force dynamical friction which is important in the evolution of star clusters and the formation of galaxies. In certain circumstances Fokker?Planck evolution also describes the evolution of dark (invisible) matter in the universe. In the early universe the thermal decoupling of weakly interacting massive particles from the plasma of relativistic leptons and photons is governed by Fokker?Planck evolution. The resulting dissipation imprints a minimum length scale for cosmic density fluctuations. Still later these density fluctuations produce stochastic gravitational forces on the dark matter as it begins to cluster under gravity. The latter example provides an exact derivation of the Fokker?Planck equation without the usual assumption of Markovian dynamics.

Edmund Bertschinger

2006-01-01T23:59:59.000Z

426

Source Emissions and Transport  

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

electron micrograph image, Lara Gundel with instrumentation electron micrograph image, Lara Gundel with instrumentation Source Emissions and Transport Investigators conduct research here to characterize and better understand the sources of airborne volatile, semi-volatile and particulate organic pollutants in the indoor environment. This research includes studies of the physical and chemical processes that govern indoor air pollutant concentrations and exposures. The motivation is to contribute to the reduction of potential human health effects. Contacts Randy Maddalena RLMaddalena@lbl.gov (510) 486-4924 Mark Mendell MJMendell@lbl.gov (510) 486-5762 Links Pollutant Sources, Dynamics and Chemistry Group Batteries and Fuel Cells Buildings Energy Efficiency Electricity Grid Energy Analysis Energy Technologies Environmental Impacts

427

The Dust cloud around the White Dwarf G 29-38. 2. Spectrum from 5-40 microns and mid-infrared variability  

E-Print Network [OSTI]

We model the mineralogy and distribution of dust around the white dwarf G29-39 using the infrared spectrum from 1-35 microns and combining a wide range of materials based on spectral studies of comets and debris disks. In order of their contribution to the mid-infrared emission, the most abundant minerals for G29-38 are amorphous carbon, amorphous and crystalline silicates, water ice, and metal sulfides. The amorphous C can be equivalently replaced by other materials (like metallic Fe) with featureless infrared spectra. The best-fitting crystalline silicate is Fe-rich pyroxene. In order to absorb enough starlight to power the observed emission, the disk must either be much thinner than the stellar radius (so that it can be heated from above and below) or it must have an opening angle wider than 2 degrees. A `moderately optically thick' torus model with mass 2x10^19 g fits the spectrum well. A physically thin (less than the white dwarf radius) and optically thick disk can contribute to the near-infrared continuum only; such a disk cannot explain the longer-wavelength continuum or strong silicate features. The silicate composition contains minerals found from cometary spectra and meteorites, but Fe-rich pyroxene is more abundant than enstatite (Mg-rich pyroxene) or forsterite (Mg-rich olivine) in G29-38, in contrast to what is found in most comet or meteorite mineralogies. Enstatite meteorites may be the most similar solar system materials to the G29-38 dust. Finally, we suggest the surviving core of a `hot jupiter' as an alternative (neither cometary nor asteroidal) origin for the debris, though further theoretical work is needed to determine if this hypothesis is viable.

William T. Reach; Carey Lisse; Ted von Hippel; Fergal Mullally

2008-10-18T23:59:59.000Z

428

Operation of a Joint Utility/Industry Ambient Air Monitoring Program in the Houston Area  

E-Print Network [OSTI]

for achieving compliance of the NAAQS for ozone in Houston have largely heen directed at controlling photochemically reactive volatile hydrocarbon emissions from industrial stationary and fugitive sources. Evidence gathered by the monitoring network and from... suggest that the most cost-effective emission controls for both stationary and fugitive emissions sources in Harris County have been implemented. It is estimated that a reduction of an additional 10,000 to 20,000 tons of Volatile Organic...

Kush, J. A.

429

It is well known that a rigid body impacting on a bed of fine particles or dust may resuspend some of this dust into  

E-Print Network [OSTI]

again at a different location. The traditional view is that the resuspension is the result an impacts on the bed. The interaction of the wake with the particles on the bed may lead to resuspension. 1. INTRODUCTION Resuspension of dust and sediments is important in a wide variety of contexts

Dalziel, Stuart

430

X-ray Emission from Massive StarsX-ray Emission from Massive Stars David CohenDavid Cohen  

E-Print Network [OSTI]

X-ray Emission from Massive StarsX-ray Emission from Massive Stars David CohenDavid Cohen/s)Velocity (km/s) #12;absorption emission emission occulted emission emission UV telescope side side front back #12;absorption emission emission occulted emission emission UV telescope side side front back #12;The

Cohen, David

431

EMISSIONS TO AIR OPERATIONAL PROCEDURE  

E-Print Network [OSTI]

EMISSIONS TO AIR OPERATIONAL PROCEDURE Swansea University Estates Services Singleton Park Swansea to Air Department: Estates and Facilities Site: All Author: Ambreen Jahangir Approved by: Mark Durdin PURPOSE: To minimise emissions and discharges to air from boilers, fume cupboards, air conditioning

Harman, Neal.A.

432

Alternative Fuels Data Center: Emissions Reduction Requirements  

Alternative Fuels and Advanced Vehicles Data Center [Office of Energy Efficiency and Renewable Energy (EERE)]

Emissions Reduction Emissions Reduction Requirements to someone by E-mail Share Alternative Fuels Data Center: Emissions Reduction Requirements on Facebook Tweet about Alternative Fuels Data Center: Emissions Reduction Requirements on Twitter Bookmark Alternative Fuels Data Center: Emissions Reduction Requirements on Google Bookmark Alternative Fuels Data Center: Emissions Reduction Requirements on Delicious Rank Alternative Fuels Data Center: Emissions Reduction Requirements on Digg Find More places to share Alternative Fuels Data Center: Emissions Reduction Requirements on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Emissions Reduction Requirements Recognizing the impact of carbon-emitting fuels on climate change and to

433

Update on CO2 emissions  

SciTech Connect (OSTI)

Emissions of CO2 are the main contributor to anthropogenic climate change. Here we present updated information on their present and near-future estimates. We calculate that global CO2 emissions from fossil fuel burning decreased by 1.3% in 2009 owing to the global financial and economic crisis that started in 2008; this is half the decrease anticipated a year ago1. If economic growth proceeds as expected2, emissions are projected to increase by more than 3% in 2010, approaching the high emissions growth rates that were observed from 2000 to 20081, 3, 4. We estimate that recent CO2 emissions from deforestation and other land-use changes (LUCs) have declined compared with the 1990s, primarily because of reduced rates of deforestation in the tropics5 and a smaller contribution owing to forest regrowth elsewhere.

Friedingstein, P. [University of Exeter, Devon, England; Houghton, R.A. [Woods Hole Research Center, Woods Hole, MA; Marland, Gregg [ORNL; Hackler, J. [Woods Hole Research Center, Woods Hole, MA; Boden, Thomas A [ORNL; Conway, T.J. [NOAA, Boulder, CO; Canadell, J.G. [CSIRO Marine and Atmospheric Research; Raupach, Mike [GCP, Canberra, Australia; Ciais, Philippe [Laboratoire des Sciences du Climat et de l'Environement, France; Le Quere, Corrine [University of East Anglia, Norwich, United Kingdom

2010-12-01T23:59:59.000Z

434

THE DUST ATTENUATION LAW IN DISTANT GALAXIES: EVIDENCE FOR VARIATION WITH SPECTRAL TYPE  

SciTech Connect (OSTI)

This Letter utilizes composite spectral energy distributions (SEDs) constructed from NEWFIRM Medium-Band Survey photometry to constrain the dust attenuation curve in 0.5 < z < 2.0 galaxies. Based on similarities between the full SED shapes (0.3-8 ?m), we have divided galaxies in 32 different spectral classes and stacked their photometry. As each class contains galaxies over a range in redshift, the resulting rest-frame SEDs are well sampled in wavelength and show various spectral features including H? and the UV dust bump at 2175 Å. We fit all composite SEDs with flexible stellar population synthesis models, while exploring attenuation curves with varying slopes and UV bump strengths. The Milky Way and Calzetti law provide poor fits at UV wavelengths for nearly all SEDs. Consistent with previous studies, we find that the best-fit attenuation law varies with spectral type. There is a strong correlation between the best-fit dust slope and UV bump strength, with steeper laws having stronger bumps. Moreover, the attenuation curve correlates with specific star formation rate (SFR), with more active galaxies having shallower dust curves and weaker bumps. There is also a weak correlation with inclination. The observed trends can be explained by differences in the dust-to-star geometry, a varying grain size distribution, or a combination of both. Our results have several implications for galaxy evolution studies. First, the assumption of a universal dust model leads to biases in derived galaxy properties. Second, the presence of a dust bump may result in underestimated values for the UV slope, used to correct SFRs of distant galaxies.

Kriek, Mariska [Astronomy Department, University of California at Berkeley, Berkeley, CA 94720 (United States)] [Astronomy Department, University of California at Berkeley, Berkeley, CA 94720 (United States); Conroy, Charlie [Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064 (United States)] [Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064 (United States)

2013-09-20T23:59:59.000Z

435

Numerical simulation of dilute and dense layered coal-dust explosions  

Science Journals Connector (OSTI)

Abstract Multidimensional time-dependent simulations were performed to study the interaction of a shock wave and resulting shear layer with layers of coal dust. The simulations used a high-order compressible numerical method for fluid dynamics and included a Eulerian kinetic-theory-based granular multiphase model applicable over a range from dense to dilute particle volume fractions. Two cases were considered: a loose dust layer with an initial volume fraction of 1%, and a dense dust layer with an initial volume fraction of 47%. For both cases, the final result is a coupled complex consisting of a shock leading a coal-dust flame. In the simulations presented here, a shock is initially produced from remnants of a natural gas detonation, which has decayed into a shock once it passes into a region containing no gaseous fuel. This shock weakens further due to mechanical and thermal losses from lifting and entraining the coal dust. The lifted dust subsequently ignites in the shock-heated air and produces a structure similar to a mixing-limited, nonpremixed flame. The flame consists of a burning coal dust wave that follows the shock. The distance between the shock and ignition point is determined by the induction length of carbon char, which is ? 170 cm and ? 15 cm for the 47% and 1% cases, respectively. The burning of coal particles is predominantly from heterogeneous reactions with carbon char, and volatilized methane combustion is a secondary effect. Air and particles are mixed by relative velocity between the gas and solid phases. Coal particles burn and produce pressure waves that accelerate the shock from Mach 2.2 to 2.6 for the dilute layer, and from Mach 1.7 to 1.8 in the dense layer.

Ryan W. Houim; Elaine S. Oran

2014-01-01T23:59:59.000Z

436

Aviation emission inventory development and analysis  

Science Journals Connector (OSTI)

An up to date and accurate aviation emission inventory is a prerequisite for any detailed analysis of aviation emission impact on greenhouse gases and local air quality around airports. In this paper we present an aviation emission inventory using real ... Keywords: Air traffic, Aviation emission, Emission inventory, Environmental modelling

Viet Van Pham; Jiangjun Tang; Sameer Alam; Chris Lokan; Hussein A. Abbass

2010-12-01T23:59:59.000Z

437

Atmos. Chem. Phys., 5, 31273137, 2005 www.atmos-chem-phys.org/acp/5/3127/  

E-Print Network [OSTI]

/EC corresponded to increased residential coal combustion for heating. Total carbon (TC) was associated with source'an from coal combustion, vehicle exhaust, fugitive dust and dust storms (Cao et al., 2005; Gao et al/2005-5-3127 European Geosciences Union Atmospheric Chemistry and Physics Characterization and source

Paris-Sud XI, Université de

438

Generalized local emission tomography  

DOE Patents [OSTI]

Emission tomography enables locations and values of internal isotope density distributions to be determined from radiation emitted from the whole object. In the method for locating the values of discontinuities, the intensities of radiation emitted from either the whole object or a region of the object containing the discontinuities are inputted to a local tomography function .function..sub..LAMBDA..sup.(.PHI.) to define the location S of the isotope density discontinuity. The asymptotic behavior of .function..sub..LAMBDA..sup.(.PHI.) is determined in a neighborhood of S, and the value for the discontinuity is estimated from the asymptotic behavior of .function..sub..LAMBDA..sup.(.PHI.) knowing pointwise values of the attenuation coefficient within the object. In the method for determining the location of the discontinuity, the intensities of radiation emitted from an object are inputted to a local tomography function .function..sub..LAMBDA..sup.(.PHI.) to define the location S of the density discontinuity and the location .GAMMA. of the attenuation coefficient discontinuity. Pointwise values of the attenuation coefficient within the object need not be known in this case.

Katsevich, Alexander J. (Los Alamos, NM)

1998-01-01T23:59:59.000Z

439

Radioactive air emissions notice of construction HEPA filtered vacuum radioactive air emission units  

SciTech Connect (OSTI)

This notice of construction (NOC) requests a categorical approval for construction and operation of certain portable high-efficiency particulate air (HEPA) filtered vacuum radionuclide airborne emission units (HVUs). Approval of this NOC application is intended to allow operation of the HVUs without prior project-specific approval. This NOC does not request replacement or supersedence of any previous agreements/approvals by the Washington State Department of Health for the use of vacuums on the Hanford Site. These previous agreement/approvals include the approved NOCs for the use of EuroClean HEPA vacuums at the T Plant Complex (routine technical meeting 12/10/96) and the Kelly Decontamination System at the Plutonium-Uranium Extraction (PUREX) Plant (routine technical meeting 06/25/96). Also, this NOC does not replace or supersede the agreement reached regarding the use of HEPA hand-held/shop-vacuum cleaners for routine cleanup activities conducted by the Environmental Restoration Project. Routine cleanup activities are conducted during the surveillance and maintenance of inactive waste sites (Radioactive Area Remedial Action Project) and inactive facilities. HEPA hand-held/shop-vacuum cleaners are used to clean up spot surface contamination areas found during outdoor radiological field surveys, and to clean up localized radiologically contaminated material (e.g., dust, dirt, bird droppings, animal feces, liquids, insects, spider webs, etc.). This agreement, documented in the October 12, 1994 Routine Meeting Minutes, is based on routine cleanup consisting of spot cleanup of low-level contamination provided that, in each case, the source term potential would be below 0.1 millirem per year.

JOHNSON, R.E.

1999-09-01T23:59:59.000Z

440

Relationship Between Composition and Toxicity of Engine Emissions...  

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

Emissions Relationship Between Composition and Toxicity of Engine Emissions 2004 Diesel Engine Emissions Reduction (DEER) Conference Presentation: Lovelace Respiratory Research...

Note: This page contains sample records for the topic "fugitive dust emissions" 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

THE EFFECT OF DUST GEOMETRY ON THE Lyalpha OUTPUT OF GALAXIES  

SciTech Connect (OSTI)

We present the optical spectroscopic follow-up of 31 z = 0.3 Lyalpha emitters, previously identified by Deharveng et al. We find that 17% of the Lyalpha emitters have line ratios that require the hard ionizing continuum produced by an active galactic nucleus. The uniform dust screen geometry traditionally used in studies similar to ours is not able to simultaneously reproduce the observed high Lyalpha/Halpha and Halpha/Hbeta line ratios. We consider different possibilities for the geometry of the dust around the emitting sources. We find that also a uniform mixture of sources and dust does not reproduce the observed line ratios. Instead, these are well reproduced by a clumpy dust screen. This more realistic treatment of the geometry results in extinction corrected (Lyalpha/Halpha) {sub C} values consistent with case B recombination theory, whereas a uniform dust screen model would imply values (Lyalpha/Halpha) {sub C} higher than 8.7. Our analysis shows that there is no need to invoke ad hoc multiphase media in which the Lyalpha photons only scatter between the dusty clouds and eventually escape.

Scarlata, C.; Colbert, J.; Teplitz, H. I.; Caon, A.; Bridge, C. [Spitzer Science Center, California Institute of Technology, 314-6, Pasadena, CA-91125 (United States); Panagia, N. [Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States); Hayes, M. [Observatoire de Geneve, 51, Ch. des Maillettes, CH-1290, Sauverny (Switzerland); Siana, B.; Rau, A. [California Institute of Technology, MS 105-24, Pasadena, CA 91125 (United States); Francis, P. [Research School of Astronomy and Astrophysics, the Australian National University, Canberra 0200 (Australia); Pizzella, A. [Department of Astronomy, University of Padova, Vicolo dell'Osservatorio 3, I-35122, Padova (Italy)

2009-10-20T23:59:59.000Z

442

FRAGMENTATION AND EVOLUTION OF MOLECULAR CLOUDS. II. THE EFFECT OF DUST HEATING  

SciTech Connect (OSTI)

We investigate the effect of heating by luminosity sources in a simulation of clustered star formation. Our heating method involves a simplified continuum radiative transfer method that calculates the dust temperature. The gas temperature is set by the dust temperature. We present the results of four simulations; two simulations assume an isothermal equation of state and the two other simulations include dust heating. We investigate two mass regimes, i.e., 84 M{sub sun} and 671 M{sub sun}, using these two different energetics algorithms. The mass functions for the isothermal simulations and simulations that include dust heating are drastically different. In the isothermal simulation, we do not form any objects with masses above 1 M{sub sun}. However, the simulation with dust heating, while missing some of the low-mass objects, forms high-mass objects ({approx}20 M{sub sun}) which have a distribution similar to the Salpeter initial mass function. The envelope density profiles around the stars formed in our simulation match observed values around isolated, low-mass star-forming cores. We find the accretion rates to be highly variable and, on average, increasing with final stellar mass. By including radiative feedback from stars in a cluster-scale simulation, we have determined that it is a very important effect which drastically affects the mass function and yields important insights into the formation of massive stars.

Urban, Andrea; Evans, Neal J. [Department of Astronomy, University of Texas, Austin, TX 78712 (United States); Martel, Hugo [Departement de Physique, genie physique et optique, Universite Laval, Quebec, QC G1K 7P4 (Canada)

2010-02-20T23:59:59.000Z

443

Characteristics of airborne coal mine dust and its implication to coal workers' pneumoconiosis  

SciTech Connect (OSTI)

Size selective airborne dust samples were collected using 4-stage cassette impactors at nine different locations in continuous mining sections in each of five coal seams located in the Appalachian bituminous coal field. These coal seams were the Upper Freeport, Pittsburgh, Kittanning, Coalburg, and Pocahontas. Mineralogical analyses were performed by an x-ray powder diffraction photographic technique. The distributions of total and respirable dust concentrations were fit best by a log-normal distribution. The effects of the coal seam and the sampling location on dust levels were significant. The results of the particle size distribution analyses suggest that coal mine dust has a multi-modal distribution. The effects of the coal seam and the sampling locations were significant. The distributions obtained were often affected by such mine-related variables as ventilation rate, relative humidity, and the section dimensions. Nine minerals commonly found in the coal mine dust samples collected from the coal seams studied were illite, calcite, kaolinite, quartz, dolomite, siderite, gypsum, anhydrite, and pyrite in descending order of magnitude. Relative abundance of all mineral species except siderite and gypsum was coal seam specific and suggests that existence of coal seam variability of mineral content. Although mineral content was affected by sampling locations and the sections within a mine, the magnitude was small when compared with that of cal seams. Mineral content also appears to be affected by particle size, although no particular pattern was observed.

Kim, H.

1989-01-01T23:59:59.000Z

444

Charging of dust grains in a nonequilibrium plasma of a stratified glow discharge  

SciTech Connect (OSTI)

A theoretical model is presented that describes the charging of dust grains in the positive plasma column of a stratified glow dc discharge in argon. A one-dimensional self-consistent model is used to obtain axial profiles of the electric field, as well as the electron energy distribution function along the axis of the discharge tube. Radial profiles of the electric field are determined in the ambipolar diffusion approximation. It is assumed that, in the radial direction, the electron distribution function depends only on the total electron energy. Two-dimensional distributions of the discharge plasma parameters are calculated and used to determine the potential and charge of a test dust grain at a certain point within the discharge and the electrostatic forces acting on it. It is shown that the grain charge distribution depends strongly on the nonequilibrium electron distribution function and on the nonuniform distribution of the electric field in a stratified glow discharge. A discussion is presented on the suspension of dust grains, the separation of grains by size in the discharge striations, and a possible mechanism for the onset of vortex dust motion at the edge of a dust cloud.

Sukhinin, G. I.; Fedoseev, A. V. [Russian Academy of Sciences, Kutateladze Institute of Thermophysics, Siberian Branch (Russian Federation)

2007-12-15T23:59:59.000Z

445

Reading for Thursday Emissions scenario summary  

E-Print Network [OSTI]

emissions, for year 2000 #12;USA ­ CO2 emissions from fossil fuel combustion (2005) US EPA #12 of global rise in sea level red: reconstructed blue: tide gauges black: satellite #12;Other changes GHG emissions #12;

Schweik, Charles M.

446

NETL: Emissions Characterization - Adv. Low-NOx Burner Emissions  

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

Advanced Low-NOx Burner Emissions Characterization Advanced Low-NOx Burner Emissions Characterization The goal of this work is to develop a comprehensive, high-quality database characterizing PM2.5 emissions from utility plants firing high sulfur coals. The specific objectives are to: 1) develop and test an ultra low-NOx pulverized coal burner for plug-in retrofit applications without boiler wall tube modifications, 2) assess the impact of low-NOx PC burner operation on NOx and PM2.5 emissions, and 3) provide high-quality data to ensure that future PM2.5 regulations are based on good scientific information. The work will be performed in the Clean Environment Development Facility (CEDF), a 100 million Btu/hr near-full-scale facility located at the Alliance Research Center. Related Papers and Publications:

447

Appendix: Mercury Emissions used in CAM-Chem/Hg model. 1. Anthropogenic emissions  

E-Print Network [OSTI]

Appendix: Mercury Emissions used in CAM-Chem/Hg model. 1. Anthropogenic emissions The anthropogenic emission of mercury is directly adopted from global mercury emission inventory [Pacyna et al., 2005]. The anthropogenic emissions are shown in annual averaged total mercury emissions. (Unit: µg/m2 /day) 2. Land

Meskhidze, Nicholas

448

Wildland fire emissions, carbon, and climate: U.S. emissions inventories Narasimhan K. Larkin a,  

E-Print Network [OSTI]

Wildland fire emissions, carbon, and climate: U.S. emissions inventories Narasimhan K. Larkin a: Fire emissions Emissions inventories Greenhouse gases a b s t r a c t Emissions from wildland fire fire emissions change considerably due to fluctuations from year to year with overall fire season

449

MILLIMETER AND SUBMILLIMETER HIGH ANGULAR RESOLUTION INTERFEROMETRIC OBSERVATIONS: DUST IN THE HEART OF IRAS 18162-2048  

SciTech Connect (OSTI)

The GGD27 complex includes the HH 80-81-80N system, which is one of the most powerful molecular outflows associated with a high-mass star-forming region observed to date. This outflow is powered by the star associated with the source IRAS 18162-2048. Here, we report on the detection of continuum emission at subarcsec/arcsec resolution with the Submillimeter Array (SMA) at 1.36 mm and 456 {mu}m, respectively. We detected dust emission arising from two compact cores, MM1 and MM2, separated by about 7'' ({approx}12,000 AU in projected distance). MM1 spatially coincides with the powerful thermal radio continuum jet that powers the very extended molecular outflow, while MM2 is associated with the protostar that drives the compact molecular outflow recently found in this region. High angular resolution observations at 1.36 mm show that MM1 is unresolved and that MM2 splits into two subcomponents separated by {approx}1''. The mass of MM1 is about 4 M{sub sun} and it has a size of {approx}<300 AU. This is consistent with MM1 being associated with a massive and dense (n(H{sub 2}) {approx}> 10{sup 9} cm{sup -3}) circumstellar dusty disk surrounding a high-mass protostar, which has not yet developed a compact H II region. On the other hand, the masses of the two separate components of MM2 are about 2 M{sub sun} each. One of these components is a compact core with an intermediate-mass young protostar inside and the other component is probably a prestellar core. MM1 is the brightest source at 1.36 mm, while MM2 dominates the emission at 456 {mu}m. These are the only (sub)millimeter sources detected in the SMA observations. Hence, it seems that both sources may contribute significantly to the bolometric luminosity of the region. Finally, we argue that the characteristics of these two sources indicate that MM2 is probably in an earlier evolutionary stage than MM1.

Fernandez-Lopez, M.; Curiel, S. [Instituto de Astronomia, Universidad Nacional Autonoma de Mexico (UNAM), Apartado Postal 70-264, 04510 Mexico, DF (Mexico); Girart, J. M. [Institut de Ciencies de l'Espai (CSIC-IEEC), Campus UAB, Facultat de Ciencies, Torre C5-parell 2, 08193 Bellaterra, Catalunya (Spain); Ho, P. T. P. [Academia Sinica Institute of Astronomy and Astrophysics, P.O. Box 23-141, Taipei 10617, Taiwan (China); Patel, N. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Gomez, Y., E-mail: manferna@gmail.com, E-mail: scuriel@astroscu.unam.mx, E-mail: girart@ieec.cat, E-mail: y.gomez@astrosmo.unam.mx [Centro de Radioastronomia y Astrofisica, UNAM, Apartado Postal 3-72, Morelia, Michoacan 58089 (Mexico)

2011-03-15T23:59:59.000Z

450

Radionuclide Air Emissions Report for 2012  

E-Print Network [OSTI]

Air Emissions Annual Reports for DOE Sites,” memo tooffices providing guidance for report preparation (March 22,470E-2012 Radionuclide Air Emission Report for Prepared by

Wahl, Linnea

2014-01-01T23:59:59.000Z

451

Demonstrating Fuel Consumption and Emissions Reductions with...  

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

Fuel Consumption and Emissions Reductions with Next Generation Model-Based Diesel Engine Control Demonstrating Fuel Consumption and Emissions Reductions with Next Generation...

452

Diesel Engine Emission Reduction (DEER) Experiment | Department...  

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

Emission Reduction (DEER) Experiment Diesel Engine Emission Reduction (DEER) Experiment Presentation given at DEER 2006, August 20-24, 2006, Detroit, Michigan. Sponsored by the...

453

Collaborative Emissions Research at EMSL | EMSL  

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

Collaborative Emissions Research at EMSL Collaborative Emissions Research at EMSL EMSL produced this video for the annual congressional science expo organized by the National User...

454

Low Emissions Asian Development (LEAD) Program - Bangladesh ...  

Open Energy Info (EERE)

Redirect page Jump to: navigation, search REDIRECT Low Emissions Asian Development (LEAD) Program Retrieved from "http:en.openei.orgwindex.php?titleLowEmissionsAsianDevel...

455

School Bus Emissions Study | Department of Energy  

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

School Bus Emissions Study School Bus Emissions Study 2003 DEER Conference Presentation: international Truck and Engine Corporation deer2003slodowske.pdf More Documents &...

456

Particle Number & Particulate Mass Emissions Measurements on...  

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

Number & Particulate Mass Emissions Measurements on a 'Euro VI' Heavy-duty Engine using the PMP Methodologies Particle Number & Particulate Mass Emissions Measurements on a 'Euro...

457

Characterizing Test Methods and Emissions Reduction Performance...  

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

Test Methods and Emissions Reduction Performance of In-Use Diesel Retrofit Technologies from the National Clean Diesel Campaign Characterizing Test Methods and Emissions Reduction...

458

Vehicle Emissions Review - 2011 | Department of Energy  

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

NOx control, diesel oxidation catalysts, gasoline particulate filters deer11johnson.pdf More Documents & Publications Vehicle Emissions Review - 2012 Diesel Emission...

459

Vehicle Technologies Office: Emission Control | Department of...  

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

Batteries Fuel Efficiency & Emissions Combustion Engines Fuel Effects on Combustion Idle Reduction Emissions Waste Heat Recovery Lightweighting Parasitic Loss Reduction Lubricants...

460

Vehicle Technologies Office: Fuel Efficiency and Emissions |...  

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

Batteries Fuel Efficiency & Emissions Combustion Engines Fuel Effects on Combustion Idle Reduction Emissions Waste Heat Recovery Lightweighting Parasitic Loss Reduction Lubricants...

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


461

Measurement and Characterization of Unregulated Emissions from...  

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

More Documents & Publications Ethanol Effects on Lean-Burn and Stoichiometric GDI Emissions Measurement and Characterization of Unregulated Emissions from Advanced...

462

Particulate Emissions Control by Advanced Filtration Systems...  

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

Particulate Emissions Control by Advanced Filtration Systems or GDI Engines Particulate Emissions Control by Advanced Filtration Systems or GDI Engines 2013 DOE Hydrogen and Fuel...

463

Corporate response to emissions trading in Lithuania  

Science Journals Connector (OSTI)

The article highlights the preconditions for emissions trading in Lithuania, identifies the factors that influence ... competitive advantage via participation in the European Union Emissions Trading Scheme (EU ET...

R?ta Bubnien?

2008-01-01T23:59:59.000Z

464

Integrated Nozzle Flow, Spray, Combustion, & Emission Modeling...  

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

Spray, Combustion, & Emission Modeling using KH-ACT Primary Breakup Model & Detailed Chemistry Integrated Nozzle Flow, Spray, Combustion, & Emission Modeling using KH-ACT Primary...

465

Integrated Nozzle Flow, Spray, Combustion, & Emission Modeling...  

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

Combustion, and Emission Modeling Using KH-ACT Primary Breakup Model & Detailed Chemistry Sibendu Som, Douglas E. Longman Engine and Emissions Group (Energy Systems Division)...

466

Club Convergence in Carbon Dioxide Emissions  

Science Journals Connector (OSTI)

We examine convergence in carbon dioxide emissions among 128 countries for the period 1960–...2 emissions among all the countries under scrutiny in...

Ekaterini Panopoulou; Theologos Pantelidis

2009-09-01T23:59:59.000Z

467

Influence of operating conditions and coal properties on \\{NOx\\} and N2O emissions in pressurized fluidized bed combustion of subbituminous coals  

Science Journals Connector (OSTI)

This experimental study is aimed at finding effects of operating conditions in PFBC on nitrogen oxide emissions for subbituminous coals differing in ash content/composition, combustion/gasification reactivities and in particle size distribution. The experiments have been done on a smaller laboratory apparatus with ID=8 cm. The effects of operating pressure (0.1–1 MPa), temperature of the fluidized bed (800–900 °C), freeboard temperature and oxygen concentration (3–10 vol.%) on the nitrogen oxides emissions are relatively complex, coupled with temperature of burning coal particles. The coal ash content/composition (esp. CaO and Fe2O3) and fly ash freeboard concentration play an important role in formation/destruction chemistry of both NO and N2O. The \\{NOx\\} emissions decrease with increasing operating pressure at the same volumetric oxygen concentration and temperature. Temperature, volatile content, reactivities of coals and ash composition are the most important factors for N2O emissions. The N2O emissions are either almost constant or can exhibit a maximum at increasing operating pressure. Influence of increasing oxygen concentration on \\{NOx\\} and N2O emissions is more pronounced at lower operating pressures, esp. for the less reactive, medium ash coal. The particle size distribution of the coal (influence of coal dust) can cause characteristic changes in \\{NOx\\} and N2O emissions in PFBC, esp. at lower combustion temperatures (800–840 °C). The emission changes are dependent on ash properties/composition.

Karel Svoboda; Michael Poho?elý

2004-01-01T23:59:59.000Z

468

Carbon Emissions: Petroleum Refining Industry  

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

Petroleum Refining Industry Petroleum Refining Industry Carbon Emissions in the Petroleum Refining Industry The Industry at a Glance, 1994 (SIC Code: 2911) Total Energy-Related Emissions: 79.9 million metric tons of carbon (MMTC) -- Pct. of All Manufacturers: 21.5% -- Nonfuel Emissions: 16.5 MMTC Total First Use of Energy: 6,263 trillion Btu -- Pct. of All Manufacturers: 28.9% Nonfuel Use of Energy Sources: 3,110 trillion Btu (49.7%) -- Naphthas and Other Oils: 1,328 trillion Btu -- Asphalt and Road Oil: 1,224 trillion Btu -- Lubricants: 416 trillion Btu Carbon Intensity: 12.75 MMTC per quadrillion Btu Energy Information Administration, "1994 Manufacturing Energy Consumption Survey", "Monthly Refinery Report" for 1994, and Emissions of Greenhouse Gases in the United States 1998.

469

Fuel Mix and Emissions Disclosure  

Broader source: Energy.gov [DOE]

In 2001, Nevada enacted legislation requiring the state’s electric utilities to provide details regarding the fuel mix and emissions of electric generation to their customers. Utilities must...

470

Exoelectron Emission from Synthetic Corundums  

Science Journals Connector (OSTI)

...Radiation Protection Dosimetry Article Exoelectron Emission from Synthetic Corundums M. Yousif Charif R. Gout J. Barthe M. Petel Corundums (Alpha Al2O3) have been synthesised by the thermal dehydration of hydrargilite (Al2O3, H2O......

M. Yousif Charif; R. Gout; J. Barthe; M. Petel

1983-05-01T23:59:59.000Z

471

Fuel Mix and Emissions Disclosure  

Broader source: Energy.gov [DOE]

Iowa adopted regulations in 2003 that generally require rate-regulated electric utilities to disclose to customers the fuel mix and estimated emissions, in pounds per megawatt-hour (MWh), of...

472

Greenhouse Gases and Emissions Trading  

Science Journals Connector (OSTI)

Atmospheric concentrations of carbon dioxide and other greenhouse gases have grown rapidly since the beginning of this century. Unless emissions are controlled, the world could face rapid climate changes, incl...

Alice LeBlanc; Daniel J. Dudek

1993-01-01T23:59:59.000Z

473

1770 emissions trading system [n  

Science Journals Connector (OSTI)

envir. pol. (As permitted by the Kyoto Protocol of 1997, the sale of unused quotas of carbon dioxide [CO2] emissions to other countries, which can then use them as credits for their own accounts. The...

2010-01-01T23:59:59.000Z

474

Fuel Mix and Emissions Disclosure  

Broader source: Energy.gov [DOE]

Rhode Island requires all entities that sell electricity in the state to disclose details regarding the fuel mix and emissions of their electric generation to end-use customers. This information...

475

Observations of the impact of a major Saharan dust storm on the atmospheric radiation balance  

SciTech Connect (OSTI)

Saharan dust storms transport large quantities of material across the African continent and beyond, causing widespread disruption and hazards to health. The dust may be deposited into the Atlantic Ocean, where it provides an important source of nutrients1, and may be carried as far as the West Indies. Such events may also influence the growth of Atlantic tropical cyclones. Satellite observations have enabled estimates to be made of the effect of the dust on the radiation budget seen from space, but only limited in situ observations have hitherto been made at the surface. Here we present the first simultaneous and continuous observations of the effect of a major dust storm in March 2006 on the radiation budget both at the top of the atmosphere (TOA) and at the surface. We combine data from the Geostationary Earth Radiation Budget (GERB) broadband radiometer and the Spinning Enhanced Visible and InfraRed Imager (SEVIRI) on the Meteosat-8 weather satellite with remote sensing and in situ measurements from a new Mobile Facility located in Niamey, Niger (13{sup o} 29'N, 2{sup o} 10'E), operated by the US Atmospheric Radiation Measurement (ARM) program. We show that the dust produced major perturbations to the radiation budget seen from space and from the surface. By combining the two datasets, we estimate the impact on the radiation budget of the atmosphere itself. Using independent data from the Mobile Facility, we derive the optical properties of the dust and input these and other information into radiation codes to simulate the radiative fluxes. Comparisons with the observed fluxes provides a stringent test of the ability of the codes to represent the radiative properties of this important component of the global aerosol burden.

Slingo, A.; Ackerman, Thomas P.; Allan, R. P.; Kassianov, Evgueni I.; McFarlane, Sally A.; Robinson, G. J.; Barnard, James C.; Miller, Mark; Harries, J. E.; Russell, J. E.; Dewitte, S.

2006-12-01T23:59:59.000Z

476

ICE AND DUST IN THE PRESTELLAR DARK CLOUD LYNDS 183: PREPLANETARY MATTER AT THE LOWEST TEMPERATURES  

SciTech Connect (OSTI)

Dust grains are nucleation centers and catalysts for the growth of icy mantles in quiescent interstellar clouds, the products of which may accumulate into preplanetary matter when new stars and solar systems form within the clouds. In this paper, we present the first spectroscopic detections of silicate dust and the molecular ices H{sub 2}O, CO, and CO{sub 2} in the vicinity of the prestellar core L183 (L134N). An infrared photometric survey of the cloud was used to identify reddened background stars, and we present spectra covering solid-state absorption features in the wavelength range 2-20 {mu}m for nine of them. The mean composition of the ices in the best-studied line of sight (toward J15542044-0254073) is H{sub 2}O:CO:CO{sub 2} Almost-Equal-To 100:40:24. The ices are amorphous in structure, indicating that they have been maintained at low temperature ({approx}< 15 K) since formation. The ice column density N(H{sub 2}O) correlates with reddening by dust, exhibiting a threshold effect that corresponds to the transition from unmantled grains in the outer layers of the cloud to ice-mantled grains within, analogous to that observed in other dark clouds. A comparison of results for L183 and the Taurus and IC 5146 dark clouds suggests common behavior, with mantles first appearing in each case at a dust column corresponding to a peak optical depth {tau}{sub 9.7} = 0.15 {+-} 0.03 in the silicate feature. Our results support a previous conclusion that the color excess E{sub J-K} does not obey a simple linear correlation with the total dust column in lines of sight that intercept dense clouds. The most likely explanation is a systematic change in the optical properties of the dust as the density increases.

Whittet, D. C. B.; Poteet, C. A.; Bajaj, V. M.; Horne, D. [Department of Physics, Applied Physics and Astronomy and New York Center for Astrobiology, Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, NY 12180 (United States); Chiar, J. E. [SETI Institute, Carl Sagan Center, 189 Bernardo Avenue, Mountain View, CA 94043 (United States); Pagani, L. [LERMA, UMR 8112 du CNRS, Observatoire de Paris, 61 Av. de l'Observatoire, F-75014 Paris (France); Shenoy, S. S. [SOFIA Science Center, NASA Ames Research Center, MS 232-12, Moffett Field, CA 94035 (United States); Adamson, A. J. [Gemini Observatory, Southern Operations Center, Casilla 603, La Serena (Chile)

2013-09-10T23:59:59.000Z

477

Alternative Fuels Data Center: Emissions Reduction Credits  

Alternative Fuels and Advanced Vehicles Data Center [Office of Energy Efficiency and Renewable Energy (EERE)]

Emissions Reduction Emissions Reduction Credits to someone by E-mail Share Alternative Fuels Data Center: Emissions Reduction Credits on Facebook Tweet about Alternative Fuels Data Center: Emissions Reduction Credits on Twitter Bookmark Alternative Fuels Data Center: Emissions Reduction Credits on Google Bookmark Alternative Fuels Data Center: Emissions Reduction Credits on Delicious Rank Alternative Fuels Data Center: Emissions Reduction Credits on Digg Find More places to share Alternative Fuels Data Center: Emissions Reduction Credits on AddThis.com... More in this section... Federal State Advanced Search All Laws & Incentives Sorted by Type Emissions Reduction Credits Any state mobile emissions reduction credits program must allow credits for emissions reductions achieved by converting a vehicle to operate on an

478

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Broader source: Energy.gov [DOE]

The Department of the Environment is responsible for regulating fugitive air emissions from the transportation of coal combustion by-products and the permissible beneficial uses of these by...