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Note: This page contains sample records for the topic "tall obstacles nearby" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
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We encourage you to perform a real-time search of NLEBeta
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1

Tall building collapse mechanisms initiated by fire   

E-Print Network [OSTI]

This paper introduces the hypothesis of two possible failure mechanisms for tall buildings in multiple floor fires. This paper extends the previous work done on the WTC towers by investigating more "generic" tall building frames made of standard...

Usmani, Asif; Roben, Charlotte; Johnston, Louise; Flint, Graeme

2

Apparatus for obstacle traversion  

DOE Patents [OSTI]

An apparatus for traversing obstacles having an elongated, round, flexible body that includes a plurality of drive track assemblies. The plurality of drive track assemblies cooperate to provide forward propulsion wherever a propulsion member is in contact with any feature of the environment, regardless of how many or which ones of the plurality of drive track assemblies make contact with such environmental feature.

Borenstein, Johann

2004-08-10T23:59:59.000Z

3

Microsoft Word - Tall_Pines_CX.doc  

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

Project Manager - KEWM-4 Proposed Action: Provision of funds to the Idaho Department of Fish and Game for purchase of the Tall Pines Property. Fish and Wildlife Project No.:...

4

Internal tide generation by tall ocean ridges  

E-Print Network [OSTI]

Internal tides are internal waves of tidal period generated by tidal currents flowing over submarine topography. Tall ridges that are nominally two-dimensional (2-D) are sites of particularly strong generation. The subsequent ...

Echeverri Mondragón, Paula

2009-01-01T23:59:59.000Z

5

Dynamic interrelationship between technology and architecture in tall buildings  

E-Print Network [OSTI]

The interrelationship between the technology and architecture of tall buildings is investigated from the emergence of tall buildings in the late 19th century to the present. Through the historical research, a filtering ...

Moon, Kyoung-Sun

2005-01-01T23:59:59.000Z

6

Fire Induced Collapse of Tall Buildings   

E-Print Network [OSTI]

This research was designed to investigate possible mechanisms that fires could initiate that might lead to collapse of a tall building of similar design to the WTC Towers. It was not designed to be a forensic study and no initial damage was applied...

Flint, Graeme

7

Tall Corn Ethanol LLC | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia:FAQ < RAPID Jump to:Seadov Pty LtdSteen,Ltd Jump to: navigation,Open EnergyFacilityTEPCounty,TaliaferroTall

8

Obstacle-avoiding navigation system  

DOE Patents [OSTI]

A system for guiding an autonomous or semi-autonomous vehicle through a field of operation having obstacles thereon to be avoided employs a memory for containing data which defines an array of grid cells which correspond to respective subfields in the field of operation of the vehicle. Each grid cell in the memory contains a value which is indicative of the likelihood, or probability, that an obstacle is present in the respectively associated subfield. The values in the grid cells are incremented individually in response to each scan of the subfields, and precomputation and use of a look-up table avoids complex trigonometric functions. A further array of grid cells is fixed with respect to the vehicle form a conceptual active window which overlies the incremented grid cells. Thus, when the cells in the active window overly grid cell having values which are indicative of the presence of obstacles, the value therein is used as a multiplier of the precomputed vectorial values. The resulting plurality of vectorial values are summed vectorially in one embodiment of the invention to produce a virtual composite repulsive vector which is then summed vectorially with a target-directed vector for producing a resultant vector for guiding the vehicle. In an alternative embodiment, a plurality of vectors surrounding the vehicle are computed, each having a value corresponding to obstacle density. In such an embodiment, target location information is used to select between alternative directions of travel having low associated obstacle densities.

Borenstein, Johann (Ann Arbor, MI); Koren, Yoram (Ann Arbor, MI); Levine, Simon P. (Ann Arbor, MI)

1991-01-01T23:59:59.000Z

9

Improved recovery of tall oil from black liquors  

SciTech Connect (OSTI)

Applying a d.c. of less than 15 V to acidified black liquor separates a significant amount of tall oil remaining in the black liquor sludge. An apparatus with graphite electrodes for this process is described.

Zucker, J.

1980-12-09T23:59:59.000Z

10

Wind Shear Characteristics at Central Plains Tall Towers: Preprint  

SciTech Connect (OSTI)

Conference paper for WindPower 2006 held June 4-7, 2006, in Pittsburgh, PA, describing the wind shear characteristics at tall tower sites in the Central Plains of the United States.

Schwartz, M.; Elliott, D.

2006-06-01T23:59:59.000Z

11

Ch08 oupTall Tales about Mind and Brain (Typeset by SPi, Delhi) July 12, 2006 18:34 Tall tales on intelligence  

E-Print Network [OSTI]

Ch08 oup­Tall Tales about Mind and Brain (Typeset by SPi, Delhi) July 12, 2006 18:34 Tall tales on intelligence #12;Ch08 oup­Tall Tales about Mind and Brain (Typeset by SPi, Delhi) July 12, 2006 18:34 #12;Ch08 oup­Tall Tales about Mind and Brain (Typeset by SPi, Delhi) July 12, 2006 18:34 Chapter 8 Is bigger

Aberdeen, University of

12

NUMERICAL SOLUTION OF AN INVERSE OBSTACLE ...  

E-Print Network [OSTI]

Consider the scattering of an arbitrary time-harmonic incident wave by a sound soft ... the method is simple, efficient, and stable to reconstruct the obstacle with ...

2015-01-26T23:59:59.000Z

13

Chemical composition of biomass from tall perennial tropical grasses  

SciTech Connect (OSTI)

The tall perennial tropical grasses, elephantgrass (Pennisetum purpureum Schum.), sugarcane and energycane (Saccharum sp.) and erianthus (Erianthus arundenaceum (Retz) Jesw.) have given very high oven dry biomass yields in Florida and the warm Lower South USA. No good complete analyses of the chemical composition of these grasses for planning potential energy use was available. We sampled treatments of several tall grass demonstrations and experiments containing high-biomass yielding genotypes of the above tall grass crops at several locations in Florida over the two growing seasons, 1992 and 1993. These samples were analyzed for crude protein, NDF, ADF, cellulose, hemicellulose, lignin, and IVDMD or IVOMD. The analysis for the above constituents are reported, along with biomass yields where available, for the tall grass accessions in the various demonstrations and experiments. Particular attention is given to values obtained from the high-yielding tall grasses grown on phosphatic clays in Polk County, FL, the area targeted by a NREL grant to help commercialize bioenergy use from these crops.

Prine, G.M. [Univ. of Florida, Gainesville, FL (United States); Stricker, J.A. [Polk County Extension Office, Bartow, FL (United States); Anderson, D.L. [Everglades Research and Education Center, Belle Glade, FL (United States)] [and others

1995-11-01T23:59:59.000Z

14

Tall structure lightning induced by sprite-producing discharges.  

SciTech Connect (OSTI)

The large and rapid charge transfer of some +CGs can initiate upward positive leaders from tall structures while simultaneously initiating downward positive streamers below the base of the ionosphere in the form of sprites . Structures with >400 m height have a significantly enhanced probability of launching upward positive leaders, the presence of which is readily detected later if a dart leader propagates down the channel to ground, generating a -CG return stroke. Such tall structures can be repeatedly struck if, as often happens, sprite-producing +CGs repeatedly occur .

Stanley, M. A. (Mark A.); Heavner, M. J. (Matthew J.)

2003-01-01T23:59:59.000Z

15

Process for tertiary oil recovery using tall oil pitch  

DOE Patents [OSTI]

A process and compositions for enhancing the recovery of acid crudes are disclosed. The process involves injecting caustic solutions into the reservoir to maintain a pH of 11 to 13. The fluid contains an effective amount of multivalent cation for inhibiting alkaline silica dissolution with the reservoir. A tall oil pitch soap is added as a polymeric mobility control agent. (DMC)

Radke, C.J.

1983-07-25T23:59:59.000Z

16

PARABOLIC OBSTACLE PROBLEMS APPLIED TO FINANCE A ...  

E-Print Network [OSTI]

1. Introduction. 1.1. Background. The parabolic obstacle problem refers to finding the smallest supper-solution (for a given parabolic ... H. Shahgholian is supported by Swedish Research Council. 1 ...... MR MR2052937 (2005d:35276). [BD97].

2006-03-07T23:59:59.000Z

17

Statistics of dislocation pinning at localized obstacles  

SciTech Connect (OSTI)

Pinning of dislocations at nanosized obstacles like precipitates, voids, and bubbles is a crucial mechanism in the context of phenomena like hardening and creep. The interaction between such an obstacle and a dislocation is often studied at fundamental level by means of analytical tools, atomistic simulations, and finite element methods. Nevertheless, the information extracted from such studies cannot be utilized to its maximum extent on account of insufficient information about the underlying statistics of this process comprising a large number of dislocations and obstacles in a system. Here, we propose a new statistical approach, where the statistics of pinning of dislocations by idealized spherical obstacles is explored by taking into account the generalized size-distribution of the obstacles along with the dislocation density within a three-dimensional framework. Starting with a minimal set of material parameters, the framework employs the method of geometrical statistics with a few simple assumptions compatible with the real physical scenario. The application of this approach, in combination with the knowledge of fundamental dislocation-obstacle interactions, has successfully been demonstrated for dislocation pinning at nanovoids in neutron irradiated type 316-stainless steel in regard to the non-conservative motion of dislocations. An interesting phenomenon of transition from rare pinning to multiple pinning regimes with increasing irradiation temperature is revealed.

Dutta, A. [S. N. Bose National Centre for Basic Sciences, Salt Lake, Kolkata 700098 (India); Bhattacharya, M., E-mail: mishreyee@vecc.gov.in; Barat, P. [Variable Energy Cyclotron Centre, 1/AF Bidhannagar, Kolkata 700064 (India)

2014-10-14T23:59:59.000Z

18

Flame acceleration and DDT in channels with obstacles: Effect of obstacle spacing  

SciTech Connect (OSTI)

We study flame acceleration and deflagration-to-detonation transition (DDT) in obstructed channels using 2D reactive Navier-Stokes numerical simulations. The energy release rate for the stoichiometric hydrogen-air mixture is modeled by one-step Arrhenius kinetics. Computations performed for channels with symmetrical and staggered obstacle configurations show two main effects of obstacle spacing S. First, more obstacles per unit length create more perturbations that increase the flame surface area more quickly, and therefore the flame speed grows faster. Second, DDT occurs more easily when the obstacle spacing is large enough for Mach stems to form between obstacles. These two effects are responsible for three different regimes of flame acceleration and DDT observed in simulations: (1) Detonation is ignited when a Mach stem formed by the diffracting shock reflecting from the side wall collides with an obstacle, (2) Mach stems do not form, and the detonation is not ignited, and (3) Mach stems do not form, but the leading shock becomes strong enough to ignite a detonation by direct collision with the top of an obstacle. Regime 3 is observed for small S and involves multiple isolated detonations that appear between obstacles and play a key role in final stages of flame and shock acceleration. For Regime 1 and staggered obstacle configurations, we observe resonance phenomena that significantly reduce the DDT time when S/2 is comparable to the channel width. Effects of imposed symmetry and stochasticity on DDT phenomena are also considered. (author)

Gamezo, Vadim N.; Oran, Elaine S. [Laboratory for Computational Physics and Fluid Dynamics, Naval Research Laboratory, Washington, DC 20375 (United States); Ogawa, Takanobu [Department of Mechanical Engineering, Seikei University, Kichijoji-Kitamachi, Musashino-shi, Tokyo, 180-8633 (Japan)

2008-10-15T23:59:59.000Z

19

Prolongation technologies for campaign life of tall oven  

SciTech Connect (OSTI)

In Kashima Steel Works, 25-year-old 7-meter-high coke ovens have damage on their walls. However, by using new methods of internal in-situ investigation, ceramic welding for the extended central and upper portions of coke ovens has prolonged the campaign life for over 40 years without large-scale hot repair. In this paper, introduction of these new methods, its application in Kashima and the policy of repairing the tall coke oven are reported.

Doko, Yoshiji; Saji, Takafumi; Kitayama, Yoshiteru; Yoshida, Shuhei [Sumitomo Metal Industries, Ltd., Kashima, Ibaraki (Japan). Kashima Steel Works

1997-12-31T23:59:59.000Z

20

Foam flow around an obstacle: obstacle-wall interaction , B. Dollet2  

E-Print Network [OSTI]

two-dimensional (2D) foams, such as can be made by squeezing a foam between two glass plates soFoam flow around an obstacle: obstacle-wall interaction S.J. Cox1 , B. Dollet2 , F. Graner2 1- chanics, University of Wales Aberystwyth, Ceredigion SY23 3BZ, UK, e-mail: foams@aber.ac.uk 2 Spectrom

Cox, Simon

Note: This page contains sample records for the topic "tall obstacles nearby" 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 - avamereregati tall ships Sample Search...  

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

red fall color, smooth, light gray... and female flowers produced on separate plants) Armstrong: narrow, fastigiate form, 45 tall, 15 wide, yellow... fall color, female, produces...

22

CELL BIOLOGY & MOLECULAR GENETICS Infection of Somatic Embryos of Tall Fescue with Acremonium coenophialum  

E-Print Network [OSTI]

by the endophyte naturally occurs in planta, attempts were made to duplicate this phenomenon in vitro. Callus of the interactions between tall fescue and its endophyte. TALL FESCUE is & pasture grass grown on 16 million ha in Canada and the southeastern USA (Bacon and Siegel, 1988). It is commonly infected with an endophytic

Parrott, Wayne

23

Does a toxic fungal endophyte of tall fescue affect reproduction of  

E-Print Network [OSTI]

Does a toxic fungal endophyte of tall fescue affect reproduction of takahe on offshore islands? DOC. References 9 #12;4 Jamieson & Easton--Tall fescue-endophytes and takahe reproction on offshore islands Final of Conservation. This paper may be cited as: Jamieson, I.; Sydney Easton, H. 2002: Does a toxic fungal endophyte

Jamieson, Ian

24

Aerodynamic Loads on Tall Buildings: Interactive Database Yin Zhou. M.ASCE1  

E-Print Network [OSTI]

Aerodynamic Loads on Tall Buildings: Interactive Database Yin Zhou. M.ASCE1 ; Tracy Kijewski, S database of aerodynamic loads is presented, which can be accessed by any user with Microsoft Explorer, the nondimensional aerodynamic loads can be used to compute the wind-induced response of tall buildings

Kareem, Ahsan

25

Mechanism of collapse of tall steel moment frame buildings under earthquake excitation Swaminathan Krishnan1  

E-Print Network [OSTI]

. Classical energy balance analysis shows that only long- period excitation imparts energy to tall buildings significant story-overlap, typically separated by just one story. It is shown that a simple work-energy tall steel buildings in the 1985 Mexico City earthquake, there has been sustained interest

Krishnan, Swaminathan

26

Obstacle detection for autonomous navigation : an LDRD final report.  

SciTech Connect (OSTI)

This report summarizes the analytical and experimental efforts for the Laboratory Directed Research and Development (LDRD) project entitled 'Obstacle Detection for Autonomous Navigation'. The principal goal of this project was to develop a mathematical framework for obstacle detection. The framework provides a basis for solutions to many complex obstacle detection problems critical to successful autonomous navigation. Another goal of this project was to characterize sensing requirements in terms of physical characteristics of obstacles, vehicles, and terrain. For example, a specific vehicle traveling at a specific velocity over a specific terrain requires a sensor with a certain range of detection, resolution, field-of-view, and sufficient sensitivity to specific obstacle characteristics. In some cases, combinations of sensors were required to distinguish between different hazardous obstacles and benign terrain. In our framework, the problem was posed as a multidimensional, multiple-hypothesis, pattern recognition problem. Features were extracted from selected sensors that allow hazardous obstacles to be distinguished from benign terrain and other types of obstacles. Another unique thrust of this project was to characterize different terrain classes with respect to both positive (e.g., rocks, trees, fences) and negative (e.g., holes, ditches, drop-offs) obstacles. The density of various hazards per square kilometer was statistically quantified for different terrain categories (e.g., high desert, ponderosa forest, and prairie). This quantification reflects the scale, or size, and mobility of different types of vehicles. The tradeoffs between obstacle detection, position location, path planning, and vehicle mobility capabilities were also to be characterized.

Padilla, Denise D.

2004-03-01T23:59:59.000Z

27

Frequency-based response of damped outrigger systems for tall buildings  

E-Print Network [OSTI]

The outrigger structural system for tall buildings is known to be effective in reducing lateral drift under quasi-static wind loading. Although keeping lateral deflection below the required value is certainly important, ...

Gamaliel, Renard

2008-01-01T23:59:59.000Z

28

The role of the aerodynamic modifications of the shapes of tall buildings  

E-Print Network [OSTI]

With the advances in technology, recent tall building design has undergone a shift to the free-style geometric forms in the exuberant and liberal atmosphere. As a height of the building increases, it is more susceptible ...

Lee, Jooeun, S.M. Massachusetts Institute of Technology

2011-01-01T23:59:59.000Z

29

RECIPIENT:Desert Research Institute STATE:NV PROJECT Tall Tower...  

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

of4 RECIPIENT:Desert Research Institute STATE:NV PROJECT Tall Tower Wind Energy Monitoring and Numerical Model Validation in Southern Nevada; NREl Tracking TITLE: No. 11-012...

30

Obstacle Avoidance Control of Humanoid Robot Arm through Tactile Interaction  

E-Print Network [OSTI]

Obstacle Avoidance Control of Humanoid Robot Arm through Tactile Interaction Dzmitry Tsetserukou through tactile interaction. The implementation of the approach was realized on humanoid robot arm are detailed in the paper. The possible tasks of the robot with intelligent whole-arm obstacle avoidance

Tachi, Susumu

31

Chance-Constrained Optimal Path Planning with Obstacles  

E-Print Network [OSTI]

. Williams Abstract--Autonomous vehicles need to plan trajectories to a specified goal that avoid obstacles validation with an aircraft obstacle avoidance example. I. INTRODUCTION Path planning for autonomous vehicles approach plans the future probabilistic distribution of the vehicle state so that the probability

Williams, Brian C.

32

Mobile Robotics I: Lab 3 Obstacle Avoidance with IR Sensors  

E-Print Network [OSTI]

Sensors Background IR SENSORS INTERFACE The CEENBoT comes equipped with a Left and Right non-contact bumpMobile Robotics I: Lab 3 Obstacle Avoidance with IR Sensors CEENBoTTM Mobile Robotics Platform 1.01 #12;. ( Blank ) #12;Mobile Robotics I ­ Obstacle Avoidance with IR Sensors Purpose

Farritor, Shane

33

Sensor Beams, Obstacles, and Possible Paths Benjamin Tovar1  

E-Print Network [OSTI]

Sensor Beams, Obstacles, and Possible Paths Benjamin Tovar1 , Fred Cohen2 , and Steven M. LaValle1, or animal) travels among obstacles and binary detection beams. The task is to determine the possible agent settings, which may arise from physical sensor beams or virtual beams that are derived from other sensing

LaValle, Steven M.

34

Imaging planets around nearby white dwarfs  

E-Print Network [OSTI]

We suggest that Jovian planets will survive the late stages of stellar evolution, and that white dwarfs will retain planetary systems in wide orbits (>5AU). Utilising evolutionary models for Jovian planets, we show that infra-red imaging with 8m class telescopes of suitable nearby white dwarfs should allow us to resolve and detect companions >3Mjup. Detection of massive planetary companions to nearby white dwarfs would prove that such objects can survive the final stages of stellar evolution, place constraints on the frequency of main sequence stars with planetary systems dynamically similar to our own and allow direct spectroscopic investigation of their composition and structure.

M. R. Burleigh; F. J. Clarke; S. T. Hodgkin

2002-02-09T23:59:59.000Z

35

The relevance of didactic categories for analysing obstacles in conceptual change  

E-Print Network [OSTI]

1 The relevance of didactic categories for analysing obstacles in conceptual change Revisiting research like `Grundvorstellungen' and epistemological obstacles. These didactic categories help to make

Prediger, Susanne

36

Requirements Engineering and Technology Transfer: Obstacles, Incentives and Improvement Agenda  

E-Print Network [OSTI]

Requirements Engineering and Technology Transfer: Obstacles, Incentives and Improvement Agenda technology transfer. In addition, major incentives for using RE methods are discussed, along with ideas engineering; Technology transfer 1. Introduction In a 1993 evaluation of requirements engineering (RE

Leite, Julio Cesar Sampaio do Prado

37

An obstacle-based probabilistic roadmap method for path planning  

E-Print Network [OSTI]

This thesis presents a new obstacle-based probabilistic roadmap method for motion planning for many degree of freedom robots that can be used to obtain high quality roadmaps even when the robot's configuration space is crowded. The main novelty...

Wu, Yan

1996-01-01T23:59:59.000Z

38

Tall fescue (Festuca arundinacea Schreb.) is the pre-dominant forage species on over one million acres of  

E-Print Network [OSTI]

Fungal Endophyte While occasional negative responses of animals con- suming tall fescue were observed an endophyte because it is found within tissue and does not affect the outward appear- ance of the grass. In the scientific community, the tall fescue fungal endophyte was formerly known as Acremonium coenophialum, but has

Liskiewicz, Maciej

39

Ergopeptine Alkaloid Production by Endophytes in a Common Tall Fescue Genotype iN. s. Hill,* W.A. Parrott, and D. D. Pope  

E-Print Network [OSTI]

Ergopeptine Alkaloid Production by Endophytes in a Common Tall Fescue Genotype iN. s. Hill,* W the plantwithaddedvigor,developmentof endophyte-infectedtall fescuepopulationsthatareincapableof producingergopeptineal thatwasinfectedbytwodifferentendophyteisolatesthatexpress differentlevels of alkaloidswhenin theirhostplants.Endophyte- free tall fescueGenotypePDN2

Parrott, Wayne

40

AUTHOR: Mitchell A. Pavao-Zuckerman, John C. Waller, Teri Ingle, and Henry A. TITLE: Methane Emissions of Beef Cattle Grazing Tall Fescue Pastures at Three  

E-Print Network [OSTI]

: Methane Emissions of Beef Cattle Grazing Tall Fescue Pastures at Three Levels of Endophyte Infestation.) is an important forage in the eastern United States. The toxic syndrome associated with the endophytic fungus taurus) on two pastures each of E+ tall fescue, of endophyte free (E-) tall fescue, of E+/E- (1:1 ratio

Pavao-Zuckerman, Mitchell

Note: This page contains sample records for the topic "tall obstacles nearby" 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

Stand persistence of tall fescue pasture cultivars free of or infested with Acremonium coenophialum  

E-Print Network [OSTI]

-1071, USA The endophytic fungus A. coenophialum in tall fescue (Festuca arundinacea) is associated of endophyte free (E-) cultivars leads to improved livestock performance, persistence and stress tolerance of E. Levels of endophyte infestation were monitored yearly and remained constant. Stand density, ground cover

Paris-Sud XI, Université de

42

Endophyte symbiosis with tall fescue: how strong are the impacts on communities and ecosystems?  

E-Print Network [OSTI]

Review Endophyte symbiosis with tall fescue: how strong are the impacts on communities: Competition Herbivory Lolium arundinaceum MAXQ endophyte Neotyphodium coenophialum Predators Soil Trophc interactions a b s t r a c t We have investigated community and ecosystem consequences of endophyte symbiosis

Rudgers, Jennifer

43

Nutrient composition of tall fescue pasture forage free of or infested with Acremonium coenophialum  

E-Print Network [OSTI]

with the endophytic fungus A. coenophialum is associated with substantial economic reduction in grazing livestock shown that the use of endophyte-free (E-) cultivars leads to improved cattle performance (increased weight gain, milk production, and conception rate) compared to endophyte infected (E+) tall fescue

Paris-Sud XI, Université de

44

Peroxidase activity of perennial ryegrass and tall fescue seedlings artificially infected with endophytes  

E-Print Network [OSTI]

with endophytes Walid Naffaaa Catherine Ravelb Nicole Boyer' Jean-Jacques Guillaumina a Unité de pathologie. The peroxidase activity of tall fescue cv. Clarine artificially infected with Neotyphodium coenophialum or with e-endophytes ryegrass cv. Vigor artificially infected with different e-endophytes. In contrast, artificial infection

Paris-Sud XI, Université de

45

Lightning strikes to tall objects: Currents inferred from far electromagnetic fields versus directly measured currents  

E-Print Network [OSTI]

-field-to-current conversion factor for lightning strikes to flat ground based on the transmission line model and (b currents on tall towers are used for testing the validity of field-to-current conversion equations [e on current measurement location (e.g., near the top or bottom of the tower) and on whether initial or largest

Florida, University of

46

Along-Wind Load Effects on Tall Buildings: Comparative Study of Major International Codes and Standards  

E-Print Network [OSTI]

buildings utilizing major international codes and standards: ASCE 7-98 ASCE 1999 , AS1170.2-89 AustralianAlong-Wind Load Effects on Tall Buildings: Comparative Study of Major International Codes and Standards Yin Zhou1 ; Tracy Kijewski, S.M.ASCE2 ; and Ahsan Kareem, M.ASCE3 Abstract: Most international

Kareem, Ahsan

47

Gone are the days of awkwardly angling your tall plastic water  

E-Print Network [OSTI]

Gone are the days of awkwardly angling your tall plastic water bottle under the rushing arc of the number of plastic water bottles saved from landfills.As of Oct.31, the station in the RFC alone has with Facilities Planning and Management, retrofitted six standard drinking fountains with new EZH2O water bottle

Baskaran, Mark

48

The Use of Tall Tower Field Data for Estimating Wind Turbine Power Performance , J. Chapman1  

E-Print Network [OSTI]

The Use of Tall Tower Field Data for Estimating Wind Turbine Power Performance A. Swift1 , J wind speed measurements on the TTU WISE 200m and 78m towers. A hypothetical wind turbine is shown. At potential wind turbine sites, it is uncommon to have wind measurements available at multiple heights. Then

Manuel, Lance

49

Collapse scenarios of WTC 1 & 2 with extension to generic tall buildings   

E-Print Network [OSTI]

the collapse of the tall buildings of the World Trade Center (WTC) complex on September 11, 2001 following the terrorist attacks that day. The aim of these analyses has no been to carry out a “forensic” investigation (as this was done by official US government...

Usmani, Asif; Flint, Graeme; Jowsey, Allan; Roben, Charlotte; Torero, Jose L

50

VISION-BASED OBSTACLE AVOIDANCE FOR A SMALL, LOW-COST ROBOT  

E-Print Network [OSTI]

VISION-BASED OBSTACLE AVOIDANCE FOR A SMALL, LOW-COST ROBOT Chau Nguyen Viet, Ian Marshall Computer.marshall@kent.ac.uk Keywords: obstacle-avoidance, robot vision. Abstract: This paper presents a vision-based obstacle avoidance algorithm for a small indoor mobile robot built from low-cost, and off-the-shelf electronics. The obstacle

Marshall, Ian W.

51

The nonequilibrium Ehrenfest gas: a chaotic model with flat obstacles?  

E-Print Network [OSTI]

It is known that the non-equilibrium version of the Lorentz gas (a billiard with dispersing obstacles, electric field and Gaussian thermostat) is hyperbolic if the field is small. Differently the hyperbolicity of the non-equilibrium Ehrenfest gas constitutes an open problem, since its obstacles are rhombi and the techniques so far developed rely on the dispersing nature of the obstacles. We have developed analytical and numerical investigations which support the idea that this model of transport of matter has both chaotic (positive Lyapunov exponent) and non-chaotic steady states with a quite peculiar sensitive dependence on the field and on the geometry, not observed before. The associated transport behaviour is correspondingly highly irregular, with features whose understanding is of both theoretical and technological interest.

Carlo Bianca; Lamberto Rondoni

2008-11-25T23:59:59.000Z

52

Reverse Time Migration for Extended Obstacles: Acoustic Waves  

E-Print Network [OSTI]

We consider the resolution of the single frequency reverse time migration (RTM) method for extended targets without the assumption of the validation of geometric optics approximation. The resolution analysis, which applies in both penetrable and non-penetrable obstacles with sound soft or impedance boundary condition on the boundary of the obstacle, implies that the imaginary part of the cross-correlation imaging functional is always positive and thus may have better stability properties. Numerical experiments are included to illustrate the powerful imaging quality and to confirm our resolution results.

Junqing Chen; Zhiming Chen; Guanghui Huang

2014-06-10T23:59:59.000Z

53

THE ACS NEARBY GALAXY SURVEY TREASURY  

SciTech Connect (OSTI)

The ACS Nearby Galaxy Survey Treasury (ANGST) is a systematic survey to establish a legacy of uniform multi-color photometry of resolved stars for a volume-limited sample of nearby galaxies (D < 4 Mpc). The survey volume encompasses 69 galaxies in diverse environments, including close pairs, small and large groups, filaments, and truly isolated regions. The galaxies include a nearly complete range of morphological types spanning a factor of {approx}10{sup 4} in luminosity and star formation rate. The survey data consist of images taken with the Advanced Camera for Surveys (ACS) on the Hubble Space Telescope (HST), supplemented with archival data and new Wide Field Planetary Camera 2 (WFPC2) imaging taken after the failure of ACS. Survey images include wide field tilings covering the full radial extent of each galaxy, and single deep pointings in uncrowded regions of the most massive galaxies in the volume. The new wide field imaging in ANGST reaches median 50% completenesses of m {sub F475W} = 28.0 mag, m {sub F606W} = 27.3 mag, and m {sub F814W} = 27.3 mag, several magnitudes below the tip of the red giant branch (TRGB). The deep fields reach magnitudes sufficient to fully resolve the structure in the red clump. The resulting photometric catalogs are publicly accessible and contain over 34 million photometric measurements of >14 million stars. In this paper we present the details of the sample selection, imaging, data reduction, and the resulting photometric catalogs, along with an analysis of the photometric uncertainties (systematic and random), for both ACS and WFPC2 imaging. We also present uniformly derived relative distances measured from the apparent magnitude of the TRGB.

Dalcanton, Julianne J.; Williams, Benjamin F.; Rosema, Keith; Gogarten, Stephanie M.; Christensen, Charlotte; Gilbert, Karoline; Hodge, Paul [Department of Astronomy, Box 351580, University of Washington, Seattle, WA 98195 (United States); Seth, Anil C. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Dolphin, Andrew [Raytheon, 1151 E. Hermans Road, Tucson, AZ 85756 (United States); Holtzman, Jon [Department of Astronomy, New Mexico State University, Box 30001, 1320 Frenger St., Las Cruces, NM 88003 (United States); Skillman, Evan D.; Weisz, Daniel [Department of Astronomy, University of Minnesota, 116 Church St. SE, Minneapolis, MN 55455 (United States); Cole, Andrew [School of Mathematics and Physics, University of Tasmania, Hobart, Tasmania (Australia); Girardi, Leo [Osservatorio Astronomico di Padova - INAF, Vicolo dell'Osservatorio 5, I-35122 Padova (Italy); Karachentsev, Igor D. [Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnji Arkhyz, Karachai-Circessia Republic 369167 (Russian Federation); Olsen, Knut [NOAO, National Optical Astronomy Observatory 950 N. Cherry Ave., Tucson, AZ 85719 (United States); Freeman, Ken [Mount Stromlo Observatory, Research School of Astronomy and Astrophysics, The Australian National Univ., ACT 0200 (Australia); Gallart, Carme [Inst. de AstrofIsica de Canarias, VIa Lactea, s/n, 38200 La Laguna, Tenerife (Spain); Harris, Jason [Steward Observatory, Univ. of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721 (United States); De Jong, Roelof S. [Space Telescope Science Inst., 3700 San Martin Dr., Baltimore, MD 21218 (United States)], E-mail: jd@astro.washington.edu, E-mail: ben@astro.washington.edu, E-mail: krosema@astro.washington.edu, E-mail: stephanie@astro.washington.edu, E-mail: christensen@astro.washington.edu, E-mail: fabio@astro.washington.edu, E-mail: trq@astro.washington.edu, E-mail: aseth@cfa.harvard.edu (and others)

2009-07-15T23:59:59.000Z

54

Comparison of three widely-used aerodynamic modifications that minimize the impact of wind loads on tall buildings  

E-Print Network [OSTI]

For tall buildings, motion caused by wind is usually the most damaging to the lateral support system. As a result, engineers have invented many different methods to limit the motion of the buildings, for example dampers, ...

Kwok, Raymond Hoi-Kit

2007-01-01T23:59:59.000Z

55

A contribution to urbanism--the tall building as a multi-dimensional framework for additive growth and change  

E-Print Network [OSTI]

Skyscrapers do not destroy cities; they make them look different and they make the urban space more crowded, but they have not yet put an end to the urban environment. Many of the problems with the early tall buildings ...

Nelson, David J. (David Jeffrey)

1987-01-01T23:59:59.000Z

56

A Probabilistic Approach to Optimal Robust Path Planning with Obstacles  

E-Print Network [OSTI]

and Brian Williams Abstract-- Autonomous vehicles need to plan trajectories to a specified goal that avoid of aircraft obstacle avoidance scenarios. I. INTRODUCTION Path planning for autonomous vehicles the future probabilistic distribution of the vehicle state so that the probability of collision

Williams, Brian C.

57

GEODESIC FRCHET DISTANCE WITH POLYGONAL OBSTACLES Atlas F. Cook IV  

E-Print Network [OSTI]

GEODESIC FR�CHET DISTANCE WITH POLYGONAL OBSTACLES Atlas F. Cook IV Carola Wenk Abstract We present the first algorithm to compute the geodesic Fréchet distance between two polygonal curves in a plane of from a point source). This shortest path map supports geodesic distance queries from any point s ab

Texas at San Antonio, University of

58

Recovering a polyhedral obstacle by a few backscattering measurements  

E-Print Network [OSTI]

We propose an inverse scattering scheme of recovering a polyhedral obstacle in $\\mathbb{R}^n$, $n=2,3$, by only a few high-frequency acoustic backscattering measurements. The obstacle could be sound-soft or sound-hard. It is shown that the modulus of the far-field pattern in the backscattering aperture possesses a certain local maximum behavior, from which one can determine the exterior normal directions of the front sides/faces. Then by using the phaseless backscattering data corresponding to a few incident plane waves with suitably chosen incident directions, one can determine the exterior unit normal vector of each side/face of the obstacle. After the determination of the exterior unit normals, the recovery is reduced to a finite-dimensional problem of determining a location point of the obstacle and the distance of each side/face away from the location point. For the latter reconstruction, we need make use of the far-field data with phases. Numerical experiments are also presented to illustrate the effectiveness of the proposed scheme.

Jingzhi Li; Hongyu Liu

2015-02-04T23:59:59.000Z

59

Workshop on Scalable Cyber-Security Challenges in Large-Scale Networks: Deployment Obstacles  

E-Print Network [OSTI]

Workshop on Scalable Cyber-Security Challenges in Large-Scale Networks: Deployment Obstacles Large, and Definitions of Cybersecurity.... 8 Conventional Wisdom is Inadequate....................................... 9 Directions in Scalable Cyber-Security in Large-Scale Networks: Deployment Obstacles." The workshop

Feigenbaum, Joan

60

Molecular gas in nearby powerful radio galaxies  

E-Print Network [OSTI]

We report the detection of CO(1-0) and CO(2-1) emission from the central region of nearby 3CR radio galaxies (z$gas content is below 10$^9$ \\msun. Their individual CO emission exhibit, for 5 cases, a double-horned line profile that is characteristic of an inclined rotating disk with a central depression at the rising part of its rotation curve. The inferred disk or ring distributions of the molecular gas is consistent with the observed presence of dust disks or rings detected optically in the cores of the galaxies. We reason that if their gas originates from the mergers of two gas-rich disk galaxies, as has been invoked to explain the molecular gas in other radio galaxies, then these galaxies must have merged a long time ago (few Gyr or more) but their remnant elliptical galaxies only recently (last 10$^7$ years or less) become active radio galaxies. Instead, we argue the the cannibalism of gas-rich galaxies provide a simpler explanation for the origin of molecular gas in the elliptical hosts of radio galaxies (Lim et al. 2000). Given the transient nature of their observed disturbances, these galaxies probably become active in radio soon after the accretion event when sufficient molecular gas agglomerates in their nuclei.

S. Leon; J. Lim; F. Combes; D. Van-Trung

2001-07-26T23:59:59.000Z

Note: This page contains sample records for the topic "tall obstacles nearby" 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

The Photometric Properties of Nearby Type Ia Supernovae  

E-Print Network [OSTI]

The Rise-Time Distribution of Nearby Type Ia Supernovae 3.1Highlight: The Physics of Supernovae, ed. W. Hillebrandt &1.1 Supernovae . . . . . . . . . . . . . . 1.1.1

Ganeshalingam, Mohan

2012-01-01T23:59:59.000Z

62

ROFESSOR SUSAN J SMITH doesn't look like a radical. Tall, elegant and softly spoken she  

E-Print Network [OSTI]

26 CAM 59 #12;P ROFESSOR SUSAN J SMITH doesn't look like a radical. Tall, elegant and softly spoken she might be, but under that calm exterior, Professor Smith has a startling ­ and seemingly highly, Susan J Smith (the initial, she says, essential in a world dictated by Google) rather enjoys swimming

63

tall tower facility and instrumentation New coNstraiNts oN the Nitrous oxide budget of agricultural ecosystems  

E-Print Network [OSTI]

thick. The FAO classification is Chernozem. The field site has been under cultivation for the past 125. The tall tower source footprint is dominated by agricultural land use. The domi- nant crop types include measured at 100 m using a three dimensional sonic anemometer- thermometer for computation of energy, water

Minnesota, University of

64

A Survey of Gaps, Obstacles, and Technical Challenges for Hypersonic Applications.  

E-Print Network [OSTI]

?? The object of this study is to canvas the literature for the purpose of identifying and compiling a list of Gaps, Obstacles, and Technological… (more)

Barber, Timothy Andrew

2012-01-01T23:59:59.000Z

65

Kinematic segregation of nearby disk stars from the Hipparcos database  

E-Print Network [OSTI]

To better understand our Galaxy, we investigate the pertinency of describing the sys tem of nearby disk stars in terms of a two-components Schwarzschild velocity distributio n.Using the proper motion and parallax information of Hipparcos database, we determine t he parameters characterizing the local stellar velocity field of a sample of 22000 disk stars. The sample we use is essentially the same as the one described by the criteria ad opted to study the LSR and the stream motion of the nearby stellar population

R. E. de Souza; R. Teixeira

2007-04-25T23:59:59.000Z

66

Detecting API Usage Obstacles: A Study of iOS and Android Developer Questions  

E-Print Network [OSTI]

Detecting API Usage Obstacles: A Study of iOS and Android Developer Questions Wei Wang and Michael, they often encounter obstacles in finding the correct usage of the API, let alone to employ best practices. Previous research addresses this line of questions by mining API usage patterns to induce API usage

Godfrey, Michael W.

67

Clustering Spatial Data in the Presence of Obstacles Xin Wang and Howard J. Hamilton  

E-Print Network [OSTI]

Clustering Spatial Data in the Presence of Obstacles Xin Wang and Howard J. Hamilton Department of Computer Science University of Regina, Regina, Sask, Canada S4S 0A2 {wangx, hamilton-based clustering method DBRS (Wang and Hamilton 2003) to handle obstacles and call the extended method DBRS

68

ECOSYSTEM COMPONENT CHARACTERIZATION 461 Failing or nearby septic tank systems  

E-Print Network [OSTI]

ECOSYSTEM COMPONENT CHARACTERIZATION 461 · Failing or nearby septic tank systems · Exfiltration from sanitary sewers in poor repair · Leaking underground storage tanks and pipes · Landfill seepage or natural environment Leaks from underground storage tanks and pipes are a common source of soil

Pitt, Robert E.

69

Motions of galaxies in the nearby universe with 2MASS  

E-Print Network [OSTI]

I present the first model of a flow-field in the nearby Universe (cz < 12, 000 km s-') constructed from groups of galaxies identified in an all-sky flux-limited survey. The Two Micron All-Sky Redshift Survey (2MRS), upon ...

Crook, Aidan Christopher

2009-01-01T23:59:59.000Z

70

Effects of multiple climate change factors on the tall fescue-fungal endophyte symbiosis: infection frequency and tissue chemistry.  

SciTech Connect (OSTI)

Climate change (altered CO{sub 2}, warming, and precipitation) may affect plant-microbial interactions, such as the Lolium arundinaceum-Neotyphodium coenophialum symbiosis, to alter future ecosystem structure and function. To assess this possibility, tall fescue tillers were collected from an existing climate manipulation experiment in a constructed old-field community in Tennessee (USA). Endophyte infection frequency (EIF) was determined, and infected (E+) and uninfected (E-) tillers were analysed for tissue chemistry. The EIF of tall fescue was higher under elevated CO{sub 2} (91% infected) than with ambient CO{sub 2} (81%) but was not affected by warming or precipitation treatments. Within E+ tillers, elevated CO{sub 2} decreased alkaloid concentrations of both ergovaline and loline, by c. 30%; whereas warming increased loline concentrations 28% but had no effect on ergovaline. Independent of endophyte infection, elevated CO{sub 2} reduced concentrations of nitrogen, cellulose, hemicellulose, and lignin. These results suggest that elevated CO{sub 2}, more than changes in temperature or precipitation, may promote this grass-fungal symbiosis, leading to higher EIF in tall fescue in old-field communities. However, as all three climate factors are likely to change in the future, predicting the symbiotic response and resulting ecological consequences may be difficult and dependent on the specific atmospheric and climatic conditions encountered.

Brosi, Glade [University of Kentucky; McCulley, Rebecca L [University of Kentucky; Bush, L P [University of Kentucky; Nelson, Jim A [University of Kentucky; Classen, Aimee T [University of Tennessee, Knoxville (UTK); Norby, Richard J [ORNL

2011-01-01T23:59:59.000Z

71

Locating Nearby Sources of Air Pollution by Nonparametric Regression of Atmospheric Concentrations on Wind Direction  

E-Print Network [OSTI]

Locating Nearby Sources of Air Pollution by Nonparametric Regression of Atmospheric Concentrations. #12;1 Locating Nearby Sources of Air Pollution by Nonparametric Regression of Atmospheric. * Corresponding author. Submitted to Atmospheric Environment July, 2001. Abstract The relationship

Washington at Seattle, University of

72

Obstacles to Teaching in the Face of Academic Diversity: Implcations for Planning for Students with Disabilities  

E-Print Network [OSTI]

This study was a collaborative project the incorporated the concerns and insights of 52 secondary science and social studies teachers in identifying the major obstacles in planning to teach academically diverse groups of ...

Lenz, B. Keith; Kissam, Brenda; Bulgren, Janis; Melvin, Jeff; Roth, Janet

1992-08-01T23:59:59.000Z

73

Multi-layer approach to motion planning in obstacle rich environment  

E-Print Network [OSTI]

obstacle-rich environments. This research has led to the development of the multilayer trajectory generation approach. It is built on the principle of separation of concerns, which partitions a given problem into multiple independent layers, and addresses...

Kim, Sung Hyun

2009-05-15T23:59:59.000Z

74

E-Print Network 3.0 - adjustable-protrusion surface-obstacle...  

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

Pluid Mech. (1974), vol. 64, part 3, pp. 529-563 Printed in Great Britain Summary: the wakes behind two-dimensional surface obstacles whose height is small compared with the...

75

Sensor integration for implementation of obstacle avoidance in an autonomous helicopter system  

E-Print Network [OSTI]

Autonomous Flight Control System (AFCS), was developed as a platform to support the development of the obstacle avoidance system through integration of sensors and onboard processing capabilities. The system has proven in various flight tests that it has...

Mentzer, Christopher Isaac

2006-08-16T23:59:59.000Z

76

On the 3D steady flow of a second grade fluid past an obstacle  

E-Print Network [OSTI]

We study steady flow of a second grade fluid past an obstacle in three space dimensions. We prove existence of solution in weighted Lebesgue spaces with anisotropic weights and thus existence of the wake region behind the obstacle. We use properties of the fundamental Oseen tensor together with results achieved in \\cite{Koch} and properties of solutions to steady transport equation to get up to arbitrarily small $\\ep$ the same decay as the Oseen fundamental solution.

Pawe? Konieczny; Ond?ej Kreml

2010-10-29T23:59:59.000Z

77

Demonstration of the Federation of OMF Control Framework with PlanetLab Peer-to-peer resolution of an obstacle problem using the P2Pdc framework  

E-Print Network [OSTI]

of an obstacle problem using the P2Pdc framework Scenario: - Distributed Application for Problem Solving

Ingrand, François

78

Infrared colour properties of nearby radio-luminous galaxies  

E-Print Network [OSTI]

By combining the data of the Two Micron All Sky Survey (2MASS), the Wide Field Infrared Survey Explorer (WISE) and the Akari satellite, we study the infrared colour properties of a sample of 2712 nearby radio-luminous galaxies (RLGs). These RLGs are divided into radio-loud (RL) active galactic nuclei (AGNs), mainly occurring at redshifts of $0.05$ 3.0. We also analyse the MIR colours of RL AGNs divided into low- and high-excitation radio galaxies (LERGs and HERGs, respectively). The ([3.4]-[4.6])$-$([4.6]-[12]) diagram clearly shows separate distributions of LERGs and HERGs and a region of overlap, which suggests that LERGs and HERGs have different MIR properties. LERGs are responsible for the double-core distribution of RL AGNs on the ([3.4]-[4.6])$-$([4.6]-[12]) diagram. In addition, we also suggest 90$-$140$\\mu$m band spectral index $\\alpha(90,140)<-1.4$ as a criterion of selecting nearby active galaxies with non-thermal emissions at FIR wavelengths.

Yang, Xiao-hong; Huang, Yan

2015-01-01T23:59:59.000Z

79

HI emission and absorption in nearby, gas-rich galaxies  

E-Print Network [OSTI]

We present the results of a targeted search for intervening HI absorption in six nearby, gas-rich galaxies using the Australia Telescope Compact Array (ATCA). The sightlines searched have impact parameters of 10-20 kpc. By targeting nearby galaxies we are also able to map their HI emission, allowing us to directly relate the absorption-line detection rate to the extended HI distribution. The continuum sightlines intersect the HI disk in four of the six galaxies, but no intervening absorption was detected. Of these four galaxies, we find that three of the non-detections are the result of the background source being too faint. In the fourth case we find that the ratio of the spin temperature to the covering factor ($T_{\\mathrm{S}}/f$) must be much higher than expected ($\\gtrsim$5700 K) in order to explain the non-detection. We discuss how the structure of the background continuum sources may have affected the detection rate of HI absorption in our sample, and the possible implications for future surveys. Future...

Reeves, S N; Allison, J R; Koribalski, B S; Curran, S J; Pracy, M B

2015-01-01T23:59:59.000Z

80

Two-dimensional flows of foam: drag exerted on circular obstacles and dissipation  

E-Print Network [OSTI]

A Stokes experiment for foams is proposed. It consists in a two-dimensional flow of a foam, confined between a water subphase and a top plate, around a fixed circular obstacle. We present systematic measurements of the drag exerted by the flowing foam on the obstacle, \\emph{versus} various separately controlled parameters: flow rate, bubble volume, solution viscosity, obstacle size and boundary conditions. We separate the drag into two contributions, an elastic one (yield drag) at vanishing flow rate, and a fluid one (viscous coefficient) increasing with flow rate. We quantify the influence of each control parameter on the drag. The results exhibit in particular a power-law dependence of the drag as a function of the solution viscosity and the flow rate with two different exponents. Moreover, we show that the drag decreases with bubble size, increases with obstacle size, and that the effect of boundary conditions is small. Measurements of the streamwise pressure gradient, associated to the dissipation along the flow of foam, are also presented: they show no dependence on the presence of an obstacle, and pressure gradient depends on flow rate, bubble volume and solution viscosity with three independent power laws.

Benjamin Dollet; Florence Elias; Catherine Quilliet; Arnaud Huillier; Miguel Aubouy; Francois Graner

2004-11-22T23:59:59.000Z

Note: This page contains sample records for the topic "tall obstacles nearby" 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

Catalog of Nearby Galaxies and the Local Cosmic Web  

E-Print Network [OSTI]

We compiled an all-sky catalog of 451 nearby galaxies, each having an individual distance estimate $D \\la 10$ Mpc or the radial velocity $V_{LG} -17.0$, which contribute about 4% to the local luminosity density, and $\\sim(10-16)$% to the local HI mass density. We found that the mean local barion density $\\Omega_b(<8$ Mpc) = 2.3% consists of only a half of the global barion density, $\\Omega_b=(4.7\\pm0.6)$% (Spergel et al. 2003). The mean-square pairwise difference of radial velocities is about 100 km s$^{-1}$ for spatial separations within 1 Mpc, increasing to $\\sim 300$ km s$^{-1}$ on a scale of $\\sim 3$ Mpc.

Igor D. Karachentsev; Valentina E. Karachentseva; Walter K. Huchtmeier; Dmitry I. Makarov

2004-10-04T23:59:59.000Z

82

Separation of suspended particles by arrays of obstacles in microfluidic devices  

E-Print Network [OSTI]

The stochastic transport of suspended particles through a periodic pattern of obstacles in microfluidic devices is investigated by means of the Fokker-Planck equation. Asymmetric arrays of obstacles have been shown to induce the continuous separation of DNA molecules of different length. The analysis presented here of the asymptotic distribution of particles in a unit cell of these systems shows that separation is only possible in the presence of a driving force with a non-vanishing normal component at the surface of the solid obstacles. In addition, vector separation, in which different species move, in average, in different directions within the device, is driven by differences on the force acting on the various particles and not by differences in the diffusion coefficient. Monte-Carlo simulations performed for different particles and force fields agree with the numerical solutions of the Fokker-Planck equation in the periodic system.

Zhigang Li; German Drazer

2006-06-29T23:59:59.000Z

83

http://www.staradvertiser.com/newspremium/20130824_Small_school_stands_tall_as_science_powerhouse_.html?id=220927791&c=n Page 1 of 3 Aug 28, 2013 07:39:07PM MDT  

E-Print Network [OSTI]

http://www.staradvertiser.com/newspremium/20130824_Small_school_stands_tall_as_science_powerhouse_.html?id=220927791&c=n Page 1 of 3 Aug 28, 2013 07:39:07PM MDT Small school stands tall as science powerhouse POSTED fifth -- well ahead of engineering powerhouses including the iconic Massachusetts Institute

84

Legal obstacles and incentives to the development of small scale hydroelectric potential in Michigan  

SciTech Connect (OSTI)

The legal and institutional obstacles to the development of small-scale hydroelectric energy at the state level is described. The Federal government also exercises extensive regulatory authority in the area. The first obstacle which any developer must confront in Michigan is obtaining the authority to utilize the river bed, banks, and flowing water at a proposed dam site. This involves a determination of ownership of the stream banks and bed, and the manner of obtaining either their title or use; and existing constraints with regard to the use of the water. Michigan follows the riparian theory of water law. The direct regulation; indirect regulation; public utilities regulation; financing; and taxation are discussed.

None,

1980-05-01T23:59:59.000Z

85

Study of the Effects of Obstacles in Liquefied Natural Gas (LNG) Vapor Dispersion using CFD Modeling  

E-Print Network [OSTI]

by enhanced mixing. Through parametric analysis it is demonstrated that height, width and shape of the obstacles play an important role in the vapor concentration reduction. The findings of this research may be applied in the design stage of an LNG terminal...

Ruiz Vasquez, Roberto

2012-10-19T23:59:59.000Z

86

Two-dimensional flow of foam around an obstacle: force measurements  

E-Print Network [OSTI]

A Stokes experiment for foams is proposed. It consists in a two-dimensional flow of a foam, confined between a water subphase and a top plate, around a fixed circular obstacle. We present systematic measurements of the drag exerted by the flowing foam on the obstacle, \\emph{versus} various separately controlled parameters: flow rate, bubble volume, bulk viscosity, obstacle size, shape and boundary conditions. We separate the drag into two contributions, an elastic one (yield drag) at vanishing flow rate, and a fluid one (viscous coefficient) increasing with flow rate. We quantify the influence of each control parameter on the drag. The results exhibit in particular a power-law dependence of the drag as a function of the bulk viscosity and the flow rate with two different exponents. Moreover, we show that the drag decreases with bubble size, and increases proportionally to the obstacle size. We quantify the effect of shape through a dimensioned drag coefficient, and we show that the effect of boundary conditions is small.

Benjamin Dollet; Florence Elias; Catherine Quilliet; Christophe Raufaste; Miguel Aubouy; Francois Graner

2004-10-13T23:59:59.000Z

87

Reconstructing a thin absorbing obstacle in a half-space of tissue  

E-Print Network [OSTI]

Fokker­Planck approxima- tion to the radiative transport equation. The obstacle is an absorbing- diative transport equation is an integral­differential equation for the specific intensity in the transport equation accurately. However, it is just for forward-peaked scattering that the Fokker

Kim, Arnold D.

88

Visibility-Based Strategies for Tracking and Searching Unpredictable Coherent Targets Among Known Obstacles  

E-Print Network [OSTI]

Visibility-Based Strategies for Tracking and Searching Unpredictable Coherent Targets Among Known Obstacles Christopher Vo Jyh-Ming Lien MASC group, Dept. of Computer Science, George Mason University http that incorporate informed search to regain visibility of targets when they escape the camera's view, with promising

Lien, Jyh-Ming

89

Turbidity current flow over an obstacle and phases of sediment wave generation  

E-Print Network [OSTI]

We study the flow of particle-laden turbidity currents down a slope and over an obstacle. A high-resolution 2D computer simulation model is used, based on the Navier-Stokes equations. It includes poly-disperse particle grain sizes in the current and substrate. Particular attention is paid to the erosion and deposition of the substrate particles, including application of an active layer model. Multiple flows are modeled from a lock release that can show the development of sediment waves (SW). These are stream-wise waves that are triggered by the increasing slope on the downstream side of the obstacle. The initial obstacle is completely erased by the resuspension after a few flows leading to self consistent and self generated SW that are weakly dependant on the initial obstacle. The growth of these waves is directly related to the turbidity current being self sustaining, that is, the net erosion is more than the net deposition. Four system parameters are found to influence the SW growth: (1) slope, (2) current ...

Strauss, Moshe

2011-01-01T23:59:59.000Z

90

Non-Economic Obstacles to Wind Deployment: Issues and Regional Differences (Presentation)  

SciTech Connect (OSTI)

This presentation provides an overview of national obstacles to wind deployment, with regional assessments. A special mention of offshore projects and distributed wind projects is provided. Detailed maps examine baseline capacity, military and flight radar, golden and bald eagle habitat, bat habitat, whooping crane habitat, and public lands. Regional deployment challenges are also discussed.

Baring-Gould, I.

2014-05-01T23:59:59.000Z

91

Failure-Tolerant Path Planning for the PA-10 Robot Operating Amongst Obstacles  

E-Print Network [OSTI]

Failure-Tolerant Path Planning for the PA-10 Robot Operating Amongst Obstacles Rodrigo S. Jamisola/or orientation in the workspace despite any single locked-joint failure at any time. An algorithm is presented relative to its task, only a single locked-joint failure occurs at any given time, the robot is capable

Maciejewski, Anthony A.

92

Obstacles to Global CO2 Trading: A Familiar Problem A. Denny Ellerman1  

E-Print Network [OSTI]

obstacles to the development of an international CO2 emissions trading system, but the biggest is a feature emissions trading. The paper reviews the various instruments by which such the Kyoto target might be met. The development of an international system for CO2 emissions trading should not be expected to be either quick

93

Different approximations of shallow fluid flow over an obstacle B. T. Nadiga and L. G. Margolin  

E-Print Network [OSTI]

sets of shallow water equations, representing different levels of approximation are considered the dispersive shallow water DSW solutions and those of the highly simplified, hyperbolic shallow water SW; it is only when the flows are entirely subcritical or entirely supercritical and when the obstacles are very

Nadiga, Balasubramanya T. "Balu"

94

Department of Mechanical Engineering Fall 2012 Unmanned Underwater Vehicle Test Tank and Obstacle Course  

E-Print Network [OSTI]

PENNSTATE Department of Mechanical Engineering Fall 2012 Unmanned Underwater Vehicle Test Tank and Obstacle Course Overview The purpose of this project is to design and build a test tank to showcase multiple UUVs in a competition. The tank will be vital in demonstrating the abilities of the UUVs

Demirel, Melik C.

95

Trajectory and distribution of suspended non-Brownian particles moving past a fixed spherical or cylindrical obstacle  

E-Print Network [OSTI]

We investigate the motion of a suspended non-Brownian sphere past a fixed cylindrical or spherical obstacle in the limit of zero Reynolds number for arbitrary particle-obstacle aspect ratios. We consider both a suspended sphere moving in a quiescent fluid under the action of a uniform force as well as a uniform ambient velocity field driving a freely suspended particle. We determine the distribution of particles around a single obstacle and solve for the individual particle trajectories to comment on the transport of dilute suspensions past an array of fixed obstacles. First, we obtain an expression for the probability density function governing the distribution of a dilute suspension of particles around an isolated obstacle, and we show that it is isotropic. We then present an analytical expression -- derived using both Eulerian and Lagrangian approaches -- for the minimum particle-obstacle separation attained during the motion, as a function of the incoming impact parameter, i.e. the initial offset between the line of motion far from the obstacle and the coordinate axis parallel to the driving field. Further, we derive the asymptotic behaviour for small initial offsets and show that the minimum separation decays exponentially. Finally we use this analytical expression to define an effective hydrodynamic surface roughness based on the net lateral displacement experienced by a suspended sphere moving past an obstacle.

Sumedh R. Risbud; German Drazer

2014-04-05T23:59:59.000Z

96

Bow-wave-like hydraulic jump and horseshoe vortex around an obstacle in a supercritical open channel flow  

E-Print Network [OSTI]

Bow-wave-like hydraulic jump and horseshoe vortex around an obstacle in a supercritical open the obstacle, two main flow structures are observed: i a hydraulic jump in the near-surface region and ii turbulent regime , the detachment length of the hydraulic jump exceeds the one of the horseshoe vortex

Boyer, Edmond

97

Sensor Beams, Obstacles, and Possible Paths Benjamin Tovar 1 , Fred Cohen 2 , and Steven M. LaValle 1  

E-Print Network [OSTI]

Sensor Beams, Obstacles, and Possible Paths Benjamin Tovar 1 , Fred Cohen 2 , and Steven M. La, or animal) travels among obstacles and binary detection beams. The task is to determine the possible agent settings, which may arise from physical sensor beams or virtual beams that are derived from other sensing

LaValle, Steven M.

98

Yield drag in a two-dimensional foam flow around a circular obstacle: Effect of liquid fraction  

E-Print Network [OSTI]

Yield drag in a two-dimensional foam flow around a circular obstacle: Effect of liquid fraction of foams around a circular obstacle within a long channel. In experiments, we confine the foam between liquid and glass surfaces. In simulations, we use a deterministic software, the Surface Evolver

Cox, Simon

99

INFRARED SPECTRAL ENERGY DISTRIBUTIONS OF NEARBY GALAXIES D. A. Dale,1  

E-Print Network [OSTI]

INFRARED SPECTRAL ENERGY DISTRIBUTIONS OF NEARBY GALAXIES D. A. Dale,1 G. J. Bendo,2 C. W ABSTRACT The Spitzer Infrared Nearby Galaxies Survey (SINGS) is carrying out a comprehensive) are presented using broad- band imaging data from Spitzer, 2MASS, ISO, IRAS, and SCUBA. The infrared colors

Joseph, Robert D.

100

MID-INFRARED SPECTRAL DIAGNOSTICS OF NUCLEAR AND EXTRANUCLEAR REGIONS IN NEARBY GALAXIES  

E-Print Network [OSTI]

MID-INFRARED SPECTRAL DIAGNOSTICS OF NUCLEAR AND EXTRANUCLEAR REGIONS IN NEARBY GALAXIES D. A. Dale,13 and F. Walter5 Received 2006 February 24; accepted 2006 March 31 ABSTRACT Mid-infrared diagnostics are presented for a large portion of the Spitzer Infrared Nearby Galaxies Survey (SINGS) sample plus archival

Draine, Bruce T.

Note: This page contains sample records for the topic "tall obstacles nearby" 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

Kuiper belt structure around nearby super-Earth host stars  

E-Print Network [OSTI]

We present new observations of the Kuiper belt analogues around HD 38858 and HD 20794, hosts of super-Earth mass planets within 1 au. As two of the four nearby G-type stars (with HD 69830 and 61 Vir) that form the basis of a possible correlation between low-mass planets and debris disc brightness, these systems are of particular interest. The disc around HD 38858 is well resolved with Herschel and we constrain the disc geometry and radial structure. We also present a probable JCMT sub-mm continuum detection of the disc and a CO J=2-1 upper limit. The disc around HD 20794 is much fainter and appears marginally resolved with Herschel, and is constrained to be less extended than the discs around 61 Vir and HD 38858. We also set limits on the radial location of hot dust recently detected around HD 20794 with near-IR interferometry. We present HARPS upper limits on unseen planets in these four systems, ruling out additional super-Earths within a few au, and Saturn-mass planets within 10 au. We consider the disc st...

Kennedy, Grant M; Marmier, Maxime; Greaves, Jane S; Wyatt, Mark C; Bryden, Geoffrey; Holland, Wayne; Lovis, Christophe; Matthews, Brenda C; Pepe, Francesco; Sibthorpe, Bruce; Udry, Stéphane

2015-01-01T23:59:59.000Z

102

Star Cluster Populations in the Outer Disks of Nearby Galaxies  

E-Print Network [OSTI]

We present a Large Binocular Telescope (LBT) imaging study that characterizes the star cluster component of nearby galaxy outer disks (beyond the optical radius R_25). Expanding on the pilot project of Herbert-Fort et al. (2009), we present deep (~ 27.5 mag V-band point-source limiting magnitude) U- and V-band imaging of six galaxies: IC 4182, NGC 3351, NGC 4736, NGC 4826, NGC 5474, and NGC 6503. We find that the outer disk of each galaxy is populated with marginally-resolved star clusters with masses ~10^3 M_sun and ages up to ~ 1 Gyr (masses and ages are limited by the depth of our imaging and uncertainties are large given how photometry can be strongly affected by the presence or absence of a few stars in such low mass systems), and that they are typically found out to at least 2 R_25 but sometimes as far as 3 to 4 R_25- even beyond the apparent HI disk. The mean rate of cluster formation for 1 R_25<= R <= 1.5R_25 is at least one every ~2.5 Myr and the clusters are spatially correlated with the HI, m...

Herbert-Fort, Stéphane; Moustakas, John; Di Paola, Andrea; Pogge, Richard W; Ragazzoni, Roberto

2012-01-01T23:59:59.000Z

103

The Nuclear Near-Infrared Spectral Properties of Nearby Galaxies  

E-Print Network [OSTI]

We present spectra of the nuclear regions of 50 nearby (D = 1 - 92 Mpc, median = 20 Mpc) galaxies of morphological types E to Sm. The spectra, obtained with the Gemini Near-IR Spectrograph on the Gemini North telescope, cover a wavelength range of approximately 0.85-2.5 microns at R~1300--1800. There is evidence that most of the galaxies host an active galactic nucleus (AGN), but the range of AGN luminosities (log (L2-10 keV [erg/s]) = 37.0-43.2) in the sample means that the spectra display a wide variety of features. Some nuclei, especially the Seyferts, exhibit a rich emission-line spectrum. Other objects, in particular the type 2 Low Ionisation Nuclear Emission Region galaxies, show just a few, weak emission lines, allowing a detailed view of the underlying stellar population. These spectra display numerous absorption features sensitive to the stellar initial mass function, as well as molecular bands arising in cool stars, and many other atomic absorption lines. We compare the spectra of subsets of galaxie...

Mason, R E; Martins, L; Riffel, R; Martin, O Gonzalez; Almeida, C Ramos; Dutra, D Ruschel; Ho, L C; Thanjavur, K; Flohic, H; Alonso-Herrero, A; Lira, P; McDermid, R; Riffel, R A; Schiavon, R P; Winge, C; Hoenig, M D; Perlman, E

2015-01-01T23:59:59.000Z

104

THE ACS NEARBY GALAXY SURVEY TREASURY. X. QUANTIFYING THE STAR CLUSTER FORMATION EFFICIENCY OF NEARBY DWARF GALAXIES  

SciTech Connect (OSTI)

We study the relationship between the field star formation and cluster formation properties in a large sample of nearby dwarf galaxies. We use optical data from the Hubble Space Telescope and from ground-based telescopes to derive the ages and masses of the young (t{sub age} {approx}< 100 Myr) cluster sample. Our data provide the first constraints on two proposed relationships between the star formation rate (SFR) of galaxies and the properties of their cluster systems in the low SFR regime. The data show broad agreement with these relationships, but significant galaxy-to-galaxy scatter exists. In part, this scatter can be accounted for by simulating the small number of clusters detected from stochastically sampling the cluster mass function. However, this stochasticity does not fully account for the observed scatter in our data, suggesting that there may be true variations in the fraction of stars formed in clusters in dwarf galaxies. Comparison of the cluster formation and the brightest cluster in our sample galaxies also provide constraints on cluster destruction models.

Cook, David O.; Dale, Daniel A. [Department of Physics and Astronomy, University of Wyoming, Laramie, WY 82071 (United States); Seth, Anil C. [Department of Physics and Astronomy, University of Utah, Salt Lake City, UT 84112 (United States); Johnson, L. Clifton; Weisz, Daniel R.; Fouesneau, Morgan; Dalcanton, Julianne J. [Department of Astronomy, University of Washington, Seattle, WA 98195 (United States); Olsen, Knut A. G. [National Optical Astronomy Observatory, Tucson, AZ 85719 (United States); Engelbracht, Charles W., E-mail: dcook12@uwyo.edu [Steward Observatory, University of Arizona, Tucson, AZ 85721 (United States)

2012-06-01T23:59:59.000Z

105

STAR CLUSTER POPULATIONS IN THE OUTER DISKS OF NEARBY GALAXIES  

SciTech Connect (OSTI)

We present a Large Binocular Telescope imaging study that characterizes the star cluster component of nearby galaxy outer disks (beyond the optical radius R{sub 25}). Expanding on the pilot project of Herbert-Fort et al., we present deep ({approx}27.5 mag V-band point-source limiting magnitude) U- and V-band imaging of six galaxies: IC 4182, NGC 3351, NGC 4736, NGC 4826, NGC 5474, and NGC 6503. We find that the outer disk of each galaxy is populated with marginally resolved star clusters with masses {approx}10{sup 3} M{sub Sun} and ages up to {approx}1 Gyr (masses and ages are limited by the depth of our imaging and uncertainties are large given how photometry can be strongly affected by the presence or absence of a few stars in such low-mass systems), and that they are typically found out to at least 2 R{sub 25} but sometimes as far as 3-4 R{sub 25}-even beyond the apparent H I disk. The mean rate of cluster formation for 1 R{sub 25} {<=} R {<=} 1.5 R{sub 25} is at least one every {approx}2.5 Myr and the clusters are spatially correlated with the H I, most strongly with higher density gas near the periphery of the optical disk and with lower density neutral gas at the H I disk periphery. We hypothesize that the clusters near the edge of the optical disk are formed in the extension of spiral structure from the inner disk and are a fairly consistent phenomenon and that the clusters formed at the periphery of the H I disk are the result of accretion episodes.

Herbert-Fort, Stephane; Zaritsky, Dennis [Department of Astronomy/Steward Observatory, University of Arizona, 933 N Cherry Avenue, Tucson, AZ 85721 (United States); Moustakas, John [Center for Astrophysics and Space Sciences, University of California, San Diego, La Jolla, CA 92093 (United States); Di Paola, Andrea [INAF, Osservatorio Astronomico di Roma, via di Frascati 33, I-00040 Monteporzio (Italy); Pogge, Richard W. [Department of Astronomy, Ohio State University, 140 W. 18th Avenue, Columbus, OH 43210-1173 (United States); Ragazzoni, Roberto, E-mail: s.herbertfort@gmail.com, E-mail: dennis.zaritsky@gmail.com [INAF, Osservatorio Astronomico di Padova, vicolo dell'Osservatorio 5, I-35122 Padova (Italy)

2012-08-01T23:59:59.000Z

106

Wave blocking and partial transmission in subcritical flows over an obstacle  

E-Print Network [OSTI]

We study and measure the transmission coefficient of counter-propagating shallow-water waves produced by a wave generator and scattered by an obstacle. To precisely compare theoretical predictions and experimental data, we consider $\\sim 25$ frequencies for 5 subcritical background flows, where the maximum value of the Froude number ranges from $0.5$ to $0.75$. For each flow, the transmission coefficient displays a sharp transition separating total transmission from wave-blocking. Both the width and the central frequency of the transition are in good agreement with their theoretical values. The shape of the obstacle is identical to that used by the Vancouver team in the recent experiment aiming at detecting the analogue of stimulated Hawking radiation. Our results are compatible with the observations that have been reported. They complete them by establishing that the contribution of the transmission coefficient cannot be neglected for the lower half of the probed frequency range.

Léo-Paul Euvé; Florent Michel; Renaud Parentani; Germain Rousseaux

2014-09-12T23:59:59.000Z

107

Legal obstacles and incentives to the development of small scale hydroelectric potential in Wisconsin  

SciTech Connect (OSTI)

The legal and institutional obstacles to the development of small-scale hydroelectric energy at the state level are discussed. The Federal government also exercises extensive regulatory in the area, and the dual regulatory system from the standpoint of the appropriate legal doctrine, the law of pre-emption, application of the law to the case of hydroelectric development, and an inquiry into the practical use of the doctrine by the FERC is examined. The initial obstacle that all developers confront in Wisconsin is obtaining the authority to utilize the bed, banks, and flowing water at a proposed dam site. This involves a determination of ownership of the stream banks and bed and the manner of obtaining either their title or use; and existing constraints with regard to the use of the water. Wisconsin follows the riparian theory of water law.

None,

1980-05-01T23:59:59.000Z

108

Wave blocking and partial transmission in subcritical flows over an obstacle  

E-Print Network [OSTI]

We study and measure the transmission coefficient of counter-propagating shallow-water waves produced by a wave generator and scattered by an obstacle. To precisely compare theoretical predictions and experimental data, we consider $\\sim 25$ frequencies for 5 subcritical background flows, where the maximum value of the Froude number ranges from $0.5$ to $0.75$. For each flow, the transmission coefficient displays a sharp transition separating total transmission from wave-blocking. Both the width and the central frequency of the transition are in good agreement with their theoretical values. The shape of the obstacle is identical to that used by the Vancouver team in the recent experiment aiming at detecting the analogue of stimulated Hawking radiation. Our results are compatible with the observations that have been reported. They complete them by establishing that the contribution of the transmission coefficient cannot be neglected for the lower half of the probed frequency range.

Léo-Paul Euvé; Florent Michel; Renaud Parentani; Germain Rousseaux

2015-02-06T23:59:59.000Z

109

Wave blocking and partial transmission in subcritical flows over an obstacle  

E-Print Network [OSTI]

We study and measure the transmission coefficient of counter-propagating shallow-water waves produced by a wave generator and scattered by an obstacle. To precisely compare theoretical predictions and experimental data, we consider $\\sim 25$ frequencies for 5 subcritical background flows, where the maximum value of the Froude number ranges from $0.5$ to $0.75$. For each flow, the transmission coefficient displays a sharp transition separating total transmission from wave-blocking. Both the width and the central frequency of the transition are in good agreement with their theoretical values. The shape of the obstacle is identical to that used by the Vancouver team in the recent experiment aiming at detecting the analogue of stimulated Hawking radiation. Our results are compatible with the observations that have been reported. They complete them by establishing that the contribution of the transmission coefficient cannot be neglected for the lower half of the probed frequency range.

Euvé, Léo-Paul; Parentani, Renaud; Rousseaux, Germain

2014-01-01T23:59:59.000Z

110

Some Obstacles to United States Direct Private Foreign Investment in Manufacturing: 1950-1958.  

E-Print Network [OSTI]

their productivity and thus increase their costs. In order to avoid interruptions in power service, many firms have established their own power generating units. Needless to say, this may sometimes be quite costly and represents an additional investment on which...SOME OBSTACLES TO UNITED STATES DIRECT PRIVATE POREIGN INVESTMENT IN MANUPACTURING: 1950-195S A Thesis By Milton Dudley Stewart, Jr. Submitted to the Graduate School of the Agricultural and Mechanical College of Texas in partial fulfillment...

Stewart, Milton Dudley

1960-01-01T23:59:59.000Z

111

Viscosity Solutions of Systems of PDEs with Interconnected Obstacles and Switching Problem  

SciTech Connect (OSTI)

This paper deals with existence and uniqueness of a solution in viscosity sense, for a system of m variational partial differential inequalities with inter-connected obstacles. A particular case is the Hamilton-Jacobi-Bellmann system of the Markovian stochastic optimal m-states switching problem. The switching cost functions depend on (t,x). The main tool is the notion of systems of reflected backward stochastic differential equations with oblique reflection.

Hamadene, S., E-mail: hamadene@univ-lemans.fr; Morlais, M. A., E-mail: Marie_Amelie.Morlais@univ-lemans.fr [Universite du Maine, LMM (France)

2013-04-15T23:59:59.000Z

112

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

113

E-Print Network 3.0 - acs nearby galaxy Sample Search Results  

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

Town Collection: Physics 32 Velocity fields from FORS2MXU spectroscopy1 Summary: on-Barroso et al. 2006; Sarzi et al. 2006). Integral-field spectroscopy of HII regions in nearby...

114

The Masses of Nearby Dwarfs can be Determined with Gravitational Microlensing  

E-Print Network [OSTI]

Microlensing of distant stars in the Milky Way by the nearby high proper motion stars offers a direct way to precisely measure the masses of single lower main sequence stars and brown dwarfs.

B. Paczynski

1995-04-27T23:59:59.000Z

115

Lower bounds on the obstacle number of graphs Padmini Mukkamala1, Janos Pach2, and Domotor Palvolgyi3  

E-Print Network [OSTI]

Lower bounds on the obstacle number of graphs Padmini Mukkamala1, J´anos Pach2, and D¨om¨ot¨or P are extensively studied and used in computational geometry, robot motion planning, computer vision, sensor

Pach, János

116

MOLECULAR GAS AND STAR FORMATION IN NEARBY DISK GALAXIES  

SciTech Connect (OSTI)

We compare molecular gas traced by {sup 12}CO (2-1) maps from the HERACLES survey, with tracers of the recent star formation rate (SFR) across 30 nearby disk galaxies. We demonstrate a first-order linear correspondence between {Sigma}{sub mol} and {Sigma}{sub SFR} but also find important second-order systematic variations in the apparent molecular gas depletion time, {tau}{sub dep}{sup mol}={Sigma}{sub mol}/{Sigma}{sub SFR}. At the 1 kpc common resolution of HERACLES, CO emission correlates closely with many tracers of the recent SFR. Weighting each line of sight equally, using a fixed {alpha}{sub CO} equivalent to the Milky Way value, our data yield a molecular gas depletion time, {tau}{sub dep}{sup mol}={Sigma}{sub mol}/{Sigma}{sub SFR}{approx}2.2 Gyr with 0.3 dex 1{sigma} scatter, in very good agreement with recent literature data. We apply a forward-modeling approach to constrain the power-law index, N, that relates the SFR surface density and the molecular gas surface density, {Sigma}{sub SFR}{proportional_to}{Sigma}{sub mol}{sup N}. We find N = 1 {+-} 0.15 for our full data set with some scatter from galaxy to galaxy. This also agrees with recent work, but we caution that a power-law treatment oversimplifies the topic given that we observe correlations between {tau}{sub dep}{sup mol} and other local and global quantities. The strongest of these are a decreased {tau}{sub dep}{sup mol} in low-mass, low-metallicity galaxies and a correlation of the kpc-scale {tau}{sub dep}{sup mol} with dust-to-gas ratio, D/G. These correlations can be explained by a CO-to-H{sub 2} conversion factor ({alpha}{sub CO}) that depends on dust shielding, and thus D/G, in the theoretically expected way. This is not a unique interpretation, but external evidence of conversion factor variations makes this the most conservative explanation of the strongest observed {tau}{sub dep}{sup mol} trends. After applying a D/G-dependent {alpha}{sub CO}, some weak correlations between {tau}{sub dep}{sup mol} and local conditions persist. In particular, we observe lower {tau}{sub dep}{sup mol} and enhanced CO excitation associated with nuclear gas concentrations in a subset of our targets. These appear to reflect real enhancements in the rate of star formation per unit gas, and although the distribution of {tau}{sub dep} does not appear bimodal in galaxy centers, {tau}{sub dep} does appear multivalued at fixed {Sigma}{sub H2}, supporting the idea of ''disk'' and ''starburst'' modes driven by other environmental parameters.

Leroy, Adam K.; Munoz-Mateos, Juan-Carlos [National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903 (United States); Walter, Fabian; Sandstrom, Karin; Meidt, Sharon; Rix, Hans-Walter; Schinnerer, Eva [Max Planck Institute fuer Astronomie, Koenigstuhl 17, D-69117 Heidelberg (Germany); Schruba, Andreas [California Institute for Technology, 1200 East California Boulevard, Pasadena, CA 91125 (United States); Bigiel, Frank [Theoretische Astrophysik, Albert-Ueberle-Str. 2, D-69120 Heidelberg (Germany); Bolatto, Alberto [Department of Astronomy, University of Maryland, College Park, MD (United States); Brinks, Elias [Centre for Astrophysics Research, University of Hertfordshire, Hatfield AL10 9AB (United Kingdom); De Blok, W. J. G. [Astrophysics, Cosmology and Gravity Centre, Department of Astronomy, University of Cape Town, Private Bag X3, Rondebosch 7701 (South Africa); Rosolowsky, Erik [University of British Columbia, Okanagan Campus, Kelowna, BC (Canada); Schuster, Karl-Friedrich [IRAM, 300 rue de la Piscine, F-38406 St. Martin d'Heres (France); Usero, Antonio [Observatorio Astronomico Nacional, C/ Alfonso XII, 3, E-28014 Madrid (Spain)

2013-08-01T23:59:59.000Z

117

Viscosity solutions of systems of PDEs with interconnected obstacles and Multi modes switching problems  

E-Print Network [OSTI]

This paper deals with existence and uniqueness, in viscosity sense, of a solution for a system of m variational partial differential inequalities with inter-connected obstacles. A particular case of this system is the deterministic version of the Verification Theorem of the Markovian optimal m-states switching problem. The switching cost functions are arbitrary. This problem is connected with the valuation of a power plant in the energy market. The main tool is the notion of systems of reflected BSDEs with oblique reflection.

Hamadène, Said

2011-01-01T23:59:59.000Z

118

Om du vill f en skymt av barkborrarna eller deras runristarlika spr, g ut i granskogen. P gammal gran och tall kan du frsiktigt plocka ls barkbitar,  

E-Print Network [OSTI]

Om du vill få en skymt av barkborrarna eller deras runristarlika spår, gå ut i granskogen. På gammal gran och tall kan du försiktigt plocka lös barkbitar, för att där under hitta spåren efter bita sig in i en nyfallen gran. Väl inne i barken börjar vår man att fisa ­ vad nu? Han förvandlar

119

Yield drag in a two-dimensional foam flow around a circular obstacle: Effect of liquid fraction  

E-Print Network [OSTI]

We study the two-dimensional flow of foams around a circular obstacle within a long channel. In experiments, we confine the foam between liquid and glass surfaces. In simulations, we use a deterministic software, the Surface Evolver, for bubble details and a stochastic one, the extended Potts model, for statistics. We adopt a coherent definition of liquid fraction for all studied systems. We vary it in both experiments and simulations, and determine the yield drag of the foam, that is, the force exerted on the obstacle by the foam flowing at very low velocity. We find that the yield drag is linear over a large range of the ratio of obstacle to bubble size, and is independent of the channel width over a large range. Decreasing the liquid fraction, however, strongly increases the yield drag; we discuss and interpret this dependence.

Christophe Raufaste; B. Dollet; Simon Cox; Yi Jiang; François Graner

2007-07-09T23:59:59.000Z

120

Temperature profile for glacial ice at the South Pole: Implications for life nearby subglacial lake  

E-Print Network [OSTI]

Temperature profile for glacial ice at the South Pole: Implications for life nearby subglacial lake deep of South of #9°C, which is 7°C below pressure­induced melting temperature freshwater produce contamination Lake Vostok. semiempirical expression strain vs. stress, estimate shear depth show Ice

Woschnagg, Kurt

Note: This page contains sample records for the topic "tall obstacles nearby" 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

Legal obstacles and incentives to the development of small scale hydroelectric power in Ohio  

SciTech Connect (OSTI)

The legal and institutional obstacles to the development of small-scale hydroelectric energy at the state level is described. The Federal government also exercises extensive regulatory authority in the area. The introductory section examines the regulatory system from the standpoint of the appropriate legal doctrine, the law of pre-emption, application of the law to the case of hydroelectric development, and concludes with an inquiry into the practical use of the doctrine by the FERC. A developer must obtain title or interest to a streambed from the proper riparian owners. Ohio provides assistance to an electric company in this undertaking by providing it with the power of eminent domain in the event it is unable to reach a purchase agreement with the riparian proprietors. The Ohio Water Law is discussed in detail, followed by discussions: Licensing, Permitting, and Review Procedures; Indirect Considerations; Ohio Public Utilities Commission; Ohio Department of Energy; Incidental Provision; and Financial Considerations.

None,

1980-05-01T23:59:59.000Z

122

Geometric capture and escape of a microswimmer colliding with an obstacle  

E-Print Network [OSTI]

Motivated by recent experiments, we consider the hydrodynamic capture of a microswimmer near a stationary spherical obstacle. Simulations of model equations show that a swimmer approaching a small spherical colloid is simply scattered. In contrast, when the colloid is larger than a critical size it acts as a passive trap: the swimmer is hydrodynamically captured along closed trajectories and endlessly orbits around the colloidal sphere. In order to gain physical insight into this hydrodynamic scattering problem, we address it analytically. We provide expressions for the critical trapping radius, the depth of the "basin of attraction," and the scattering angle, which show excellent agreement with our numerical findings. We also demonstrate and rationalize the strong impact of swimming-flow symmetries on the trapping efficiency. Finally, we give the swimmer an opportunity to escape the colloidal traps by considering the effects of Brownian, or active, diffusion. We show that in some cases the trapping time is g...

Spagnolie, Saverio E; Bartolo, Denis; Lauga, Eric

2014-01-01T23:59:59.000Z

123

CAIRNS: The Cluster And Infall Region Nearby Survey II. Environmental Dependence of Infrared Mass-to-Light Ratios  

E-Print Network [OSTI]

CAIRNS (Cluster And Infall Region Nearby Survey) is a spectroscopic survey of the infall regions surrounding nine nearby rich clusters of galaxies. In Paper I, we used redshifts within $\\sim 10\\Mpc$ of the centers of the clusters to determine the mass profiles of the clusters based on the phase space distribution of the galaxies. Here, we use 2MASS photometry and an additional \

K. Rines; M. J. Geller; A. Diaferio; M. J. Kurtz; T. H. Jarrett

2004-06-11T23:59:59.000Z

124

The Russian oil industry between public and private governance: obstacles to international oil companies' investment strategies1  

E-Print Network [OSTI]

The Russian oil industry between public and private governance: obstacles to international oil, July 2004 Submitted to Energy Policy The low level of involvement by international oil companies by international oil companies in that country. Meanwhile, Russia has become a principal actor on the international

Paris-Sud XI, Université de

125

Evaluation of Direct and Indirect Haptic Aiding in an Obstacle Avoidance Task for Tele-Operated Systems  

E-Print Network [OSTI]

and Automation, University of Pisa, Pisa, 56126, Italy (e-mail: lpollini@dsea.unipi.it) *** Dept. of Brain in teleoperation environments in which the operator is physically separated from the vehicle. It appears reasonable Vehicles), Human-machine interface, Telepresence, Obstacle avoidance, Multi-sensory interface. 1

126

Strained-Si-on-Insulator (SSOI) and SiGe-on-Insulator (SGOI): Fabrication Obstacles and Solutions  

E-Print Network [OSTI]

Strained-Si-on-Insulator (SSOI) and SiGe-on-Insulator (SGOI): Fabrication Obstacles and Solutions-Si and SiGe-on-insulator were fabricated, combining both the benefits of high-mobility strained-Si and SOI) to oxidized handle wafers. Layer transfer onto insulating handle wafers can be accomplished using grind

127

Obstacle detection and mapping in low-cost, low-power multi-robot systems using an Inverted  

E-Print Network [OSTI]

Obstacle detection and mapping in low-cost, low-power multi-robot systems using an Inverted with constrained memory capacity and processing power, and is called the Inverted Particle Filter. This method has circuits. An important benefit of this is reduced power consumption opening for new battery-powered

Paris-Sud XI, Université de

128

Obstacles and Call to Action as a result of the Sept. 22nd and 23rd Biofuels Sustainability portion of the conference.  

E-Print Network [OSTI]

Group 1 Obstacles and Call to Action as a result of the Sept. 22nd and 23rd Biofuels Sustainability. 22nd and 23rd Biofuels Sustainability portion of the confer- ence. #12;Group 3 Obstacles and Call to Action as a result of the Sept. 22nd and 23rd Biofuels Sustainability portion of the conference

Kyte, Michael

129

Over-parameterisation,a major obstacle to the use of artificial neural networks in hydrology ? Hydrology and Earth System Sciences, 7(5), 693706 (2003) EGU  

E-Print Network [OSTI]

Over-parameterisation,a major obstacle to the use of artificial neural networks in hydrology ? 693 Hydrology and Earth System Sciences, 7(5), 693706 (2003) © EGU Over-parameterisation, a major obstacle to the use of artificial neural networks in hydrology ? Eric Gaume and Raphael Gosset Ecole Nationale des

Paris-Sud XI, Université de

130

hal-00090531,version4-6Jul2007 Yield drag in a two-dimensional foam flow around a circular obstacle  

E-Print Network [OSTI]

hal-00090531,version4-6Jul2007 Yield drag in a two-dimensional foam flow around a circular obstacle-dimensional flow of foams around a circular obstacle within a long channel. In experiments, we confine the foam between liquid and glass surfaces. In simulations, we use a deterministic software, the Surface Evolver

Boyer, Edmond

131

Constraints on decaying dark matter from Fermi observations of nearby galaxies and clusters  

SciTech Connect (OSTI)

We analyze the impact of Fermi gamma-ray observations (primarily non-detections) of selected nearby galaxies, including dwarf spheroidals, and of clusters of galaxies on decaying dark matter models. We show that the fact that galaxy clusters do not shine in gamma rays puts the most stringent limits available to-date on the lifetime of dark matter particles for a wide range of particle masses and decay final states. In particular, our results put strong constraints on the possibility of ascribing to decaying dark matter both the increasing positron fraction reported by PAMELA and the high-energy feature in the electron-positron spectrum measured by Fermi. Observations of nearby dwarf galaxies and of the Andromeda Galaxy (M31) do not provide as strong limits as those from galaxy clusters, while still improving on previous constraints in some cases.

Dugger, Leanna; Profumo, Stefano [Department of Astronomy and Department of Physics, University of California Berkeley, 601 Campbell Hall, Berkeley, CA (United States); Jeltema, Tesla E., E-mail: greentee01@gmail.com, E-mail: tesla@ucolick.org, E-mail: profumo@scipp.ucsc.edu [UCO/Lick Observatories, 1156 High St., Santa Cruz, CA 95064 (United States)

2010-12-01T23:59:59.000Z

132

Molecular Gas in nearby Early-Type Powerful Classical Radio Galaxies  

E-Print Network [OSTI]

We report a survey for molecular gas in nearby powerful radio galaxies. Eight of the eighteen radio galaxies observed were detected with molecular masses in the range 10^7--10^9 Msun, similar to the same survey we performed towards 3C radio galaxies. The upper limits of molecular gas in the remainder are typically of 10^8 Msun, indicating that very few radiogalaxies have molecular gas reservoir with more than 10^9 Msun.

Stephane Leon; Jeremy Lim; Francoise Combes; Dinh-V-Trung

2002-11-13T23:59:59.000Z

133

The Oxygen Abundance of Nearby Galaxies from Sloan Digital Sky Survey Spectra  

E-Print Network [OSTI]

We have derived the oxygen abundance for a sample of nearby galaxies in the Data Release 5 of the Sloan Digital Sky Survey (SDSS) which possess at least two independent spectra of one or several HII regions with a detected [OIII]4363 auroral line. Since, for nearby galaxies, the [OII]3727 nebular line is out of the observed wavelength range, we propose a method to derive (O/H)_ff abundances using the classic Te method coupled with the ff relation. (O/H)_7325 abundances have also been determined, based on the [OII]7320,7330 line intensities, and using a small modification of the standard Te method. The (O/H)_ff and (O/H)_7325 abundances have been derived with both the one- and two-dimensional t_2 - t_3 relations. It was found that the (O/H)_ff abundances derived with the parametric two-dimensional t_2 - t_3 relation are most reliable. Oxygen abundances have been determined in 29 nearby galaxies, based on 84 individual abundance determinations in HII regions. Because of our selection methods, the metallicity of our galaxies lies in the narrow range 8.2 oxygen abundances in the disk of the spiral galaxy NGC 4490 is determined for the first time.

L. S. Pilyugin; T. X. Thuan

2007-07-19T23:59:59.000Z

134

NEARBY PLANETARY SYSTEMS AS LENSES DURING PREDICTED CLOSE PASSAGES TO BACKGROUND STARS  

SciTech Connect (OSTI)

The Einstein rings and proper motions of nearby stars tend to be large. Thus, every year some foreground stars within a few hundred parsecs of Earth induce gravitational lensing events in background stars. In some of these cases, the events may exhibit evidence of planets orbiting the nearby star. In fact, planets can even be discovered during relatively distant passages. Here, we study the lensing signatures associated with planets orbiting nearby high-proper-motion stars. We find the following. (1) Wide-orbit planets can be detected for all distances of closest approach between the foreground and background stars, potentially producing independent events long before and/or after the closest approach. (2) Close-orbit planets can be detected for intermediate distances of closest approach, producing quasiperiodic signatures that may occur days or weeks before and after the stellar-lens event. (3) Planets in the so-called zone for resonant lensing can significantly increase the magnification when the distance of closest approach is small, making the stellar-lens event easier to detect, while simultaneously providing evidence for planets. Because approaches close enough to allow planets to be detected can be predicted, we can plan observing strategies to take advantage of the theoretical framework built in this paper, which describes the sequence of expected effects in terms of a sequence of detection regimes.

Di Stefano, Rosanne; Matthews, James [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Lepine, Sebastien [Department of Astrophysics, Division of Physical Sciences, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024 (United States)

2013-07-10T23:59:59.000Z

135

Nearby Outdoor Environmental Support of Older Adults' Yard Activities, Neighborhood Walking and Independent Living in the Community  

E-Print Network [OSTI]

to remain healthy and gives them the ability to access daily-life services, and thus extend their independent years at home. Nearby outdoor environments on residential sites and in the neighborhoods may influence older adults' independent living through...

Wang, Zhe

2011-02-22T23:59:59.000Z

136

SUBSTELLAR OBJECTS IN NEARBY YOUNG CLUSTERS (SONYC). V. NEW BROWN DWARFS IN {rho} OPHIUCHI  

SciTech Connect (OSTI)

SONYC-Substellar Objects in Nearby Young Clusters-is a survey program to investigate the frequency and properties of substellar objects with masses down to a few times that of Jupiter in nearby star-forming regions. For the {approx}1 Myr old {rho} Ophiuchi cluster, in our earlier paper we reported deep, wide-field optical and near-infrared imaging using Subaru, combined with Two Micron All Sky Survey and Spitzer photometry, as well as follow-up spectroscopy confirming three likely cluster members, including a new brown dwarf with a mass close to the deuterium-burning limit. Here we present the results of extensive new spectroscopy targeting a total of {approx}100 candidates in {rho} Oph, with Fiber Multi Object Spectrograph at the Subaru Telescope and SINFONI at the ESO's Very Large Telescope. We identify 19 objects with effective temperatures at or below 3200 K, eight of which are newly identified very low mass probable members of {rho} Oph. Among these eight, six objects have T{sub eff} {<=} 3000 K, confirming their likely substellar nature. These six new brown dwarfs comprise one-fifth of the known substellar population in {rho} Oph. We estimate that the number of missing substellar objects in our survey area is {approx}15, down to 0.003-0.03 M{sub Sun} and for A{sub V} = 0-15. The upper limit on the low-mass star to brown dwarf ratio in {rho} Oph is 5.1 {+-} 1.4, while the disk fractions are {approx}40% and {approx}60% for stars and brown dwarfs, respectively. Both results are in line with those for other nearby star-forming regions.

Muzic, Koraljka; Jayawardhana, Ray [Department of Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S 3H4 (Canada); Scholz, Alexander [School of Cosmic Physics, Dublin Institute for Advanced Studies, 31 Fitzwilliam Place, Dublin 2 (Ireland); Geers, Vincent [Institut fuer Astronomie, ETH, Wolfgang-Pauli-Strasse 27, 8093 Zuerich (Switzerland); Tamura, Motohide, E-mail: muzic@astro.utoronto.ca [National Astronomical Observatory, Osawa 2-21-2, Mitaka, Tokyo 181 (Japan)

2012-01-10T23:59:59.000Z

137

Timing the Nearby Isolated Neutron Star RX J1856.5-3754  

E-Print Network [OSTI]

RX J1856.5-3754 is the X-ray brightest among the nearby isolated neutron stars. Its X-ray spectrum is thermal, and is reproduced remarkably well by a black-body, but its interpretation has remained puzzling. One reason is that the source did not exhibit pulsations, and hence a magnetic field strength--vital input to atmosphere models--could not be estimated. Recently, however, very weak pulsations were discovered. Here, we analyze these in detail, using all available data from the XMM-Newton and Chandra X-ray observatories. From frequency measurements, we set a 2-sigma upper limit to the frequency derivative of \\dot\

Van Kerkwijk, M H

2007-01-01T23:59:59.000Z

138

Discovery of a large dust disk around the nearby star AU Microscopium  

E-Print Network [OSTI]

We present the discovery of a circumstellar dust disk surrounding AU Microscopium (AU Mic, GJ 803, HD 197481). This young M star at 10 parsec has the same age and origin as beta Pictoris, another nearby star surrounded by a dust disk. The AU Mic disk is detected between 50 AU and 210 AU radius, a region where dust lifetimes exceed the present stellar age. Thus, AU Mic is the nearest star where we directly observe the solid material required for planet formation. Since 85% of stars are M-type, the AU Mic disk provides new clues on how the majority of planetary systems might form and evolve.

Paul Kalas; Michael C. Liu; Brenda C. Matthews

2004-03-05T23:59:59.000Z

139

On The Linearity of The Black Hole - Bulge Mass Relation in Active and in Nearby Galaxies  

E-Print Network [OSTI]

Analysis of PG quasar observations suggests a nonlinear relation between the black hole mass, M_BH, and the bulge mass, M_bulge, although a linear relation, as proposed for nearby galaxies, cannot be ruled out. New M_BH values for nearby galaxies from Gebhardt et al., and L_bulge measurements for Seyfert 1 galaxies from Virani et al., are used here to obtain a more accurate value for the slope of the M_BH-M_bulge relation. The combined sample of 40 active and non-active galaxies suggests a significantly nonlinear relation, M_BH\\propto M_bulge^{1.53\\pm 0.14}. Further support for a nonlinear relation is provided by the slope of the M_BH-stellar velocity dispersion relation found recently, and by the low M_BH found in late type spiral galaxies. The mean M_BH/M_bulge ratio is therefore not a universal constant, but rather drops from ~0.5% in bright (M_V ~ -22) ellipticals, to ~0.05% in low luminosity (M_V ~ -18) bulges. Hubble Space Telescope determinations of M_BH in late type spirals, and of the bulge magnitude in narrow line Seyfert 1 galaxies (both predicted to have low M_BH), can further test the validity of the nonlinear M_BH-M_bulge relation.

Ari Laor

2001-01-23T23:59:59.000Z

140

HERSCHEL FAR-INFRARED AND SUBMILLIMETER PHOTOMETRY FOR THE KINGFISH SAMPLE OF NEARBY GALAXIES  

SciTech Connect (OSTI)

New far-infrared and submillimeter photometry from the Herschel Space Observatory is presented for 61 nearby galaxies from the Key Insights on Nearby Galaxies: A Far-Infrared Survey with Herschel (KINGFISH) sample. The spatially integrated fluxes are largely consistent with expectations based on Spitzer far-infrared photometry and extrapolations to longer wavelengths using popular dust emission models. Dwarf irregular galaxies are notable exceptions, as already noted by other authors, as their 500 {mu}m emission shows evidence for a submillimeter excess. In addition, the fraction of dust heating attributed to intense radiation fields associated with photodissociation regions is found to be (21 {+-} 4)% larger when Herschel data are included in the analysis. Dust masses obtained from the dust emission models of Draine and Li are found to be on average nearly a factor of two higher than those based on single-temperature modified blackbodies, as single blackbody curves do not capture the full range of dust temperatures inherent to any galaxy. The discrepancy is largest for galaxies exhibiting the coolest far-infrared colors.

Dale, D. A. [Department of Physics and Astronomy, University of Wyoming, Laramie, WY 82071 (United States); Aniano, G.; Draine, B. T. [Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544 (United States); Engelbracht, C. W.; Hinz, J. L.; Montiel, E. J. [Steward Observatory, University of Arizona, Tucson, AZ 85721 (United States); Krause, O.; Groves, B. A. [Max-Planck-Institut fuer Astronomie, Koenigstuhl 17, D-69117 Heidelberg (Germany); Roussel, H. [Institut d'Astrophysique de Paris, UMR7095 CNRS, Universite Pierre and Marie Curie, 98 bis Boulevard Arago, 75014 Paris (France); Appleton, P. N. [NASA Herschel Science Center, IPAC, California Institute of Technology, Pasadena, CA 91125 (United States); Armus, L.; Beirao, P. [Spitzer Science Center, California Institute of Technology, MC 314-6, Pasadena, CA 91125 (United States); Bolatto, A. D. [Department of Astronomy, University of Maryland, College Park, MD 20742 (United States); Brandl, B. R. [Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden (Netherlands); Calzetti, D.; Crocker, A. F. [Department of Astronomy, University of Massachusetts, Amherst, MA 01003 (United States); Croxall, K. V. [Department of Physics and Astronomy, University of Toledo, Toledo, OH 43606 (United States); Galametz, M. [Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA (United Kingdom); Gordon, K. D. [Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States); Hao, C.-N., E-mail: ddale@uwyo.edu [Tianjin Astrophysics Center, Tianjin Normal University, Tianjin 300387 (China); and others

2012-01-20T23:59:59.000Z

Note: This page contains sample records for the topic "tall obstacles nearby" 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

CAIRNS: The Cluster And Infall Region Nearby Survey I. Redshifts and Mass Profiles  

E-Print Network [OSTI]

The CAIRNS (Cluster And Infall Region Nearby Survey) project is a spectroscopic survey of the infall regions surrounding eight nearby, rich, X-ray luminous clusters of galaxies. We collect 15665 redshifts (3471 new or remeasured) within \\sim 5-10 Mpc of the centers of the clusters, making it the largest study of the infall regions of clusters. We determine cluster membership and the mass profiles of the clusters based on the phase space distribution of the galaxies. All of the clusters display decreasing velocity dispersion profiles. The mass profiles are fit well by functional forms based on numerical simulations but exclude an isothermal sphere. Specifically, NFW and Hernquist models provide good descriptions of cluster mass profiles to their turnaround radii. Our sample shows that the predicted infall pattern is ubiquitous in rich, X-ray luminous clusters over a large mass range. The caustic mass estimates are in excellent agreement with independent X-ray estimates at small radii and with virial estimates at intermediate radii. The mean ratio of the caustic mass to the X-ray mass is 1.03\\pm0.11 and the mean ratio of the caustic mass to the virial mass (when corrected for the surface pressure term) is 0.93\\pm0.07. We further demonstrate that the caustic technique provides reasonable mass estimates even in merging clusters.

K. Rines; M. J. Geller; M. J. Kurtz; A. Diaferio

2003-06-25T23:59:59.000Z

142

THE ACS NEARBY GALAXY SURVEY TREASURY. III. CEPHEIDS IN THE OUTER DISK OF M81  

SciTech Connect (OSTI)

The ACS Nearby Galaxy Survey Treasury (ANGST) has acquired deep ACS imaging of a field in the outer disk of the large spiral galaxy M81. These data were obtained over a total of 20 Hubble Space Telescope orbits, providing a baseline long enough to reliably identify Cepheid variable stars in the field. Fundamental mode and first overtone types have been distinguished through comparative fits with corresponding Cepheid light curve templates derived from principal component analysis of confirmed Cepheids in the Large Magellanic Cloud (LMC), Small Magellanic Cloud, and Milky Way. A distance modulus of 27.78 {+-} 0.05 {sub r} {+-} 0.14 {sub s} with a corresponding distance of 3.60 {+-} 0.23 Mpc has been calculated from a sample of 11 fundamental mode and two first overtone Cepheids (assuming an LMC distance modulus of {mu}{sub LMC} = 18.41 {+-} 0.10 {sub r} {+-} 0.13 {sub s})

McCommas, Les P.; Williams, Benjamin F.; Dalcanton, Julianne J.; Davis, Matthew R. [Astronomy Department, University of Washington, Box 351580, Seattle, WA 98195 (United States); Yoachim, Peter [Department of Astronomy and McDonald Observatory, University of Texas, Austin, TX 78712 (United States); Dolphin, Andrew E. [Raytheon Corporation, 870 Winter Street Waltham, MA 02451 (United States)], E-mail: lmccomma@astro.washington.edu, E-mail: jd@astro.washington.edu, E-mail: ben@astro.washington.edu, E-mail: mrdavis@astro.washington.edu, E-mail: yoachim@astro.as.utexas.edu, E-mail: adolphin@ratheon.com

2009-06-15T23:59:59.000Z

143

No nearby counterparts to the moving objects in the Hubble Deep Field  

E-Print Network [OSTI]

Ibata et al (1999) have recently discovered faint, moving objects in the Hubble Deep Field. The quantity, magnitudes and proper motions of these objects are consistent with old white dwarfs making up the Galactic dark halo. We review a number of ground-based proper motion surveys in which nearby dark halo white dwarfs might be present, if they have the colours and absolute magnitudes proposed. No such objects have been found, whereas we argue here that several times more would be expected than in the Hubble Deep Field. We conclude it is unlikely that hydrogen atmosphere white dwarfs make up a significant fraction of the halo dark matter. No limits can be placed yet on helium atmosphere dwarfs from optical searches.

Chris Flynn; J. Sommer-Larsen; B. Fuchs; David S. Graff; Samir Salim; .

1999-12-14T23:59:59.000Z

144

Structure, dynamical impact and origin of magnetic fields in nearby galaxies in the SKA era  

E-Print Network [OSTI]

Magnetic fields are an important ingredient of the interstellar medium (ISM). Besides their importance for star formation, they govern the transport of cosmic rays, relevant to the launch and regulation of galactic outflows and winds, which in turn are pivotal in shaping the structure of halo magnetic fields. Mapping the small-scale structure of interstellar magnetic fields in many nearby galaxies is crucial to understand the interaction between gas and magnetic fields, in particular how gas flows are affected. Elucidation of the magnetic role in, e.g., triggering star formation, forming and stabilising spiral arms, driving outflows, gas heating by reconnection and magnetising the intergalactic medium has the potential to revolutionise our physical picture of the ISM and galaxy evolution in general. Radio polarisation observations in the very nearest galaxies at high frequencies (>= 3 GHz) and with high spatial resolution (<= 5") hold the key here. The galaxy survey with SKA1 that we propose will also be a...

Beck, Rainer; Colafrancesco, Sergio; Dettmar, Ralf-Jürgen; Ferrière, Katia; Fletcher, Andrew; Heald, George; Heesen, Volker; Horellou, Cathy; Krause, Marita; Lou, Yu-Qing; Mao, Sui Ann; Paladino, Rosita; Schinnerer, Eva; Sokoloff, Dmitry; Stil, Jeroen; Tabatabaei, Fatemeh

2015-01-01T23:59:59.000Z

145

The 60-month all-sky BAT Survey of AGN and the Anisotropy of Nearby AGN  

SciTech Connect (OSTI)

Surveys above 10 keV represent one of the the best resources to provide an unbiased census of the population of Active Galactic Nuclei (AGN). We present the results of 60 months of observation of the hard X-ray sky with Swift/BAT. In this timeframe, BAT detected (in the 15-55 keV band) 720 sources in an all-sky survey of which 428 are associated with AGN, most of which are nearby. Our sample has negligible incompleteness and statistics a factor of {approx}2 larger over similarly complete sets of AGN. Our sample contains (at least) 15 bona-fide Compton-thick AGN and 3 likely candidates. Compton-thick AGN represent a {approx}5% of AGN samples detected above 15 keV. We use the BAT dataset to refine the determination of the LogN-LogS of AGN which is extremely important, now that NuSTAR prepares for launch, towards assessing the AGN contribution to the cosmic X-ray background. We show that the LogN-LogS of AGN selected above 10 keV is now established to a {approx}10% precision. We derive the luminosity function of Compton-thick AGN and measure a space density of 7.9{sub -2.9}{sup +4.1} x 10{sup -5} Mpc{sup -3} for objects with a de-absorbed luminosity larger than 2 x 10{sup 42} erg s{sup -1}. As the BAT AGN are all mostly local, they allow us to investigate the spatial distribution of AGN in the nearby Universe regardless of absorption. We find concentrations of AGN that coincide spatially with the largest congregations of matter in the local ({le} 85 Mpc) Universe. There is some evidence that the fraction of Seyfert 2 objects is larger than average in the direction of these dense regions.

Ajello, M.; /KIPAC, Menlo Park; Alexander, D.M.; /Durham U.; Greiner, J.; /Garching, Max Planck Inst., MPE; Madejski, G.M.; /KIPAC, Menlo Park; Gehrels, N.; /NASA, Goddard; Burlon, D.; /Garching, Max Planck Inst., MPE

2012-04-02T23:59:59.000Z

146

THE NATURE OF STARBURSTS. I. THE STAR FORMATION HISTORIES OF EIGHTEEN NEARBY STARBURST DWARF GALAXIES  

SciTech Connect (OSTI)

We use archival Hubble Space Telescope observations of resolved stellar populations to derive the star formation histories (SFHs) of 18 nearby starburst dwarf galaxies. In this first paper, we present the observations, color-magnitude diagrams (CMDs), and the SFHs of the 18 starburst galaxies, based on a homogeneous approach to the data reduction, differential extinction, and treatment of photometric completeness. We adopt a star formation rate (SFR) threshold normalized to the average SFR of the individual system as a metric for classifying starbursts in SFHs derived from resolved stellar populations. This choice facilitates finding not only the currently bursting galaxies but also 'fossil' bursts increasing the sample size of starburst galaxies in the nearby (D < 8 Mpc) universe. Thirteen of the eighteen galaxies are experiencing ongoing bursts and five galaxies show fossil bursts. From our reconstructed SFHs, it is evident that the elevated SFRs of a burst are sustained for hundreds of Myr with variations on small timescales. A long >100 Myr temporal baseline is thus fundamental to any starburst definition or identification method. The longer lived bursts rule out rapid 'self-quenching' of starbursts on global scales. The bursting galaxies' gas consumption timescales are shorter than the Hubble time for all but one galaxy confirming the short-lived nature of starbursts based on fuel limitations. Additionally, we find that the strength of the H{alpha} emission usually correlates with the CMD-based SFR during the last 4-10 Myr. However, in four cases, the H{alpha} emission is significantly less than what is expected for models of starbursts; the discrepancy is due to the SFR changing on timescales of a few Myr. The inherently short timescale of the H{alpha} emission limits identifying galaxies as starbursts based on the current characteristics which may or may not be representative of the recent SFH of a galaxy.

McQuinn, Kristen B. W.; Skillman, Evan D.; Stark, David; Weisz, Daniel [Department of Astronomy, School of Physics and Astronomy, 116 Church Street, S.E., University of Minnesota, Minneapolis, MN 55455 (United States); Cannon, John M. [Department of Physics and Astronomy, Macalester College, 1600 Grand Avenue, Saint Paul, MN 55105 (United States); Dalcanton, Julianne; Williams, Benjamin [Department of Astronomy, Box 351580, University of Washington, Seattle, WA 98195 (United States); Dolphin, Andrew [Raytheon Company, 1151 E. Hermans Road, Tucson, AZ 85706 (United States); Hidalgo-RodrIguez, Sebastian [Instituto de Astrofisica de Canarias, VIa Lactea s/n. E38200, La Laguna, Tenerife, Canary Islands (Spain); Holtzman, Jon, E-mail: kmcquinn@astro.umn.ed [Department of Astronomy, New Mexico State University, Box 30001-Department 4500, 1320 Frenger Street, Las Cruces, NM 88003 (United States)

2010-09-20T23:59:59.000Z

147

MID-INFRARED IRS SPECTROSCOPY OF NGC 7331: A FIRST LOOK AT THE SPITZER INFRARED NEARBY GALAXIES SURVEY (SINGS) LEGACY  

E-Print Network [OSTI]

MID-INFRARED IRS SPECTROSCOPY OF NGC 7331: A FIRST LOOK AT THE SPITZER INFRARED NEARBY GALAXIES to 38 m using all modules of Spitzer's Infrared Spectrograph (IRS). A strong new dust emission feature with standard photodissociation region (PDR) models. Either additional PDR heating or shocks are required

Draine, Bruce T.

148

Temperature profile for glacial ice at the South Pole: Implications for life in a nearby subglacial lake  

E-Print Network [OSTI]

-induced melting temperature of freshwater ice. To produce the strong radar signal, the frozen lake must consistTemperature profile for glacial ice at the South Pole: Implications for life in a nearby subglacial by P. Buford Price, April 22, 2002 Airborne radar has detected 100 lakes under the Antarctic ice cap

Price, P. Buford

149

The Evolving ISM in the Milky Way & Nearby Galaxies ISM Theory: Gas Phases, Turbulence, and Star Formation  

E-Print Network [OSTI]

and fills much of the volume near the Galactic midplan, and cold atomic gas, which is organized into denseThe Evolving ISM in the Milky Way & Nearby Galaxies ISM Theory: Gas Phases, Turbulence, and Star modeling efforts have begun to take into account the effects of multiscale, time- dependent processes

150

FLAME facility: The effect of obstacles and transverse venting on flame acceleration and transition on detonation for hydrogen-air mixtures at large scale  

SciTech Connect (OSTI)

This report describes research on flame acceleration and deflagration-to-detonation transition (DDT) for hydrogen-air mixtures carried out in the FLAME facility, and describes its relevance to nuclear reactor safety. Flame acceleration and DDT can generate high peak pressures that may cause failure of containment. FLAME is a large rectangular channel 30.5 m long, 2.44 m high, and 1.83 m wide. It is closed on the ignition end and open on the far end. The three test variables were hydrogen mole fraction (12--30%), degree of transverse venting (by moving steel top plates---0%, 13%, and 50%), and the absence or presence of certain obstacles in the channel (zero or 33% blockage ratio). The most important variable was the hydrogen mole fraction. The presence of the obstacles tested greatly increased the flame speeds, overpressures, and tendency for DDT compared to similar tests without obstacles. Different obstacle configurations could have greater or lesser effects on flame acceleration and DDT. Large degrees of transverse venting reduced the flame speeds, overpressures, and possibility of DDT. For small degrees of transverse venting (13% top venting), the flame speeds and overpressures were higher than for no transverse venting with reactive mixtures (>18% H/sub 2/), but they were lower with leaner mixtures. The effect of the turbulence generated by the flow out the vents on increasing flame speed can be larger than the effect of venting gas out of the channel and hence reducing the overpressure. With no obstacles and 50% top venting, the flame speeds and overpressures were low, and there was no DDT. For all other cases, DDT was observed above some threshold hydrogen concentration. DDT was obtained at 15% H/sub 2/ with obstacles and no transverse venting. 67 refs., 62 figs.

Sherman, M.P.; Tieszen, S.R.; Benedick, W.B.

1989-04-01T23:59:59.000Z

151

HOST GALAXIES OF TYPE Ia SUPERNOVAE FROM THE NEARBY SUPERNOVA FACTORY  

SciTech Connect (OSTI)

We present photometric and spectroscopic observations of galaxies hosting Type Ia supernovae (SNe Ia) observed by the Nearby Supernova Factory. Combining Galaxy Evolution Explorer (GALEX) UV data with optical and near-infrared photometry, we employ stellar population synthesis techniques to measure SN Ia host galaxy stellar masses, star formation rates (SFRs), and reddening due to dust. We reinforce the key role of GALEX UV data in deriving accurate estimates of galaxy SFRs and dust extinction. Optical spectra of SN Ia host galaxies are fitted simultaneously for their stellar continua and emission lines fluxes, from which we derive high-precision redshifts, gas-phase metallicities, and H{alpha}-based SFRs. With these data we show that SN Ia host galaxies present tight agreement with the fiducial galaxy mass-metallicity relation from Sloan Digital Sky Survey (SDSS) for stellar masses log(M{sub *}/M{sub Sun }) > 8.5 where the relation is well defined. The star formation activity of SN Ia host galaxies is consistent with a sample of comparable SDSS field galaxies, though this comparison is limited by systematic uncertainties in SFR measurements. Our analysis indicates that SN Ia host galaxies are, on average, typical representatives of normal field galaxies.

Childress, M.; Aldering, G.; Aragon, C.; Bailey, S.; Fakhouri, H. K.; Hsiao, E. Y.; Kim, A. G.; Loken, S. [Physics Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720 (United States); Antilogus, P.; Bongard, S.; Canto, A.; Cellier-Holzem, F.; Guy, J. [Laboratoire de Physique Nucleaire et des Hautes Energies, Universite Pierre et Marie Curie Paris 6, Universite Paris Diderot Paris 7, CNRS-IN2P3, 4 place Jussieu, F-75252 Paris Cedex 05 (France); Baltay, C. [Department of Physics, Yale University, New Haven, CT 06250-8121 (United States); Buton, C.; Kerschhaggl, M.; Kowalski, M. [Physikalisches Institut, Universitaet Bonn, Nussallee 12, D-53115 Bonn (Germany); Chotard, N.; Copin, Y.; Gangler, E. [Universite de Lyon, F-69622, Lyon (France); Universite de Lyon 1, Villeurbanne (France); CNRS/IN2P3, Institut de Physique Nucleaire de Lyon (France); and others

2013-06-20T23:59:59.000Z

152

HOST GALAXY PROPERTIES AND HUBBLE RESIDUALS OF TYPE Ia SUPERNOVAE FROM THE NEARBY SUPERNOVA FACTORY  

SciTech Connect (OSTI)

We examine the relationship between Type Ia supernova (SN Ia) Hubble residuals and the properties of their host galaxies using a sample of 115 SNe Ia from the Nearby Supernova Factory. We use host galaxy stellar masses and specific star formation rates fitted from photometry for all hosts, as well as gas-phase metallicities for a subset of 69 star-forming (non-active galactic nucleus) hosts, to show that the SN Ia Hubble residuals correlate with each of these host properties. With these data we find new evidence for a correlation between SN Ia intrinsic color and host metallicity. When we combine our data with those of other published SN Ia surveys, we find the difference between mean SN Ia brightnesses in low- and high-mass hosts is 0.077 {+-} 0.014 mag. When viewed in narrow (0.2 dex) bins of host stellar mass, the data reveal apparent plateaus of Hubble residuals at high and low host masses with a rapid transition over a short mass range (9.8 {<=} log (M{sub *}/M{sub Sun }) {<=} 10.4). Although metallicity has been a favored interpretation for the origin of the Hubble residual trend with host mass, we illustrate how dust in star-forming galaxies and mean SN Ia progenitor age both evolve along the galaxy mass sequence, thereby presenting equally viable explanations for some or all of the observed SN Ia host bias.

Childress, M.; Aldering, G.; Aragon, C.; Bailey, S.; Fakhouri, H. K.; Hsiao, E. Y.; Kim, A. G.; Loken, S. [Physics Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720 (United States); Antilogus, P.; Bongard, S.; Canto, A.; Cellier-Holzem, F.; Guy, J. [Laboratoire de Physique Nucleaire et des Hautes Energies, Universite Pierre et Marie Curie Paris 6, Universite Paris Diderot Paris 7, CNRS-IN2P3, 4 place Jussieu, F-75252 Paris Cedex 05 (France); Baltay, C. [Department of Physics, Yale University, New Haven, CT 06250-8121 (United States); Buton, C.; Kerschhaggl, M.; Kowalski, M. [Physikalisches Institut, Universitaet Bonn, Nussallee 12, D-53115 Bonn (Germany); Chotard, N.; Copin, Y.; Gangler, E. [Universite de Lyon, F-69622, Lyon (France); Universite de Lyon 1, Villeurbanne (France); CNRS/IN2P3, Institut de Physique Nucleaire de Lyon (France); and others

2013-06-20T23:59:59.000Z

153

Discretization error estimation and exact solution generation using the method of nearby problems.  

SciTech Connect (OSTI)

The Method of Nearby Problems (MNP), a form of defect correction, is examined as a method for generating exact solutions to partial differential equations and as a discretization error estimator. For generating exact solutions, four-dimensional spline fitting procedures were developed and implemented into a MATLAB code for generating spline fits on structured domains with arbitrary levels of continuity between spline zones. For discretization error estimation, MNP/defect correction only requires a single additional numerical solution on the same grid (as compared to Richardson extrapolation which requires additional numerical solutions on systematically-refined grids). When used for error estimation, it was found that continuity between spline zones was not required. A number of cases were examined including 1D and 2D Burgers equation, the 2D compressible Euler equations, and the 2D incompressible Navier-Stokes equations. The discretization error estimation results compared favorably to Richardson extrapolation and had the advantage of only requiring a single grid to be generated.

Sinclair, Andrew J. (Auburn University Auburn, AL); Raju, Anil (Auburn University Auburn, AL); Kurzen, Matthew J. (Virginia Tech Blacksburg, VA); Roy, Christopher John (Virginia Tech Blacksburg, VA); Phillips, Tyrone S. (Virginia Tech Blacksburg, VA)

2011-10-01T23:59:59.000Z

154

Effervescent heating: constraints from nearby cooling flow clusters observed with XMM-Newton  

E-Print Network [OSTI]

We have used deprojected radial density and temperature profiles of a sample of 16 nearby CF clusters observed with XMM-Newton to test whether the effervescent heating model can satisfactorily explain the dynamics of CF clusters. For each cluster we derived the required extra heating as a function of cluster-centric distance for various values of the unknown parameters $\\dot M$ (mass deposition rate) and $f_c$ (conduction efficiency). We fitted the extra heating curve using the AGN effervescent heating function and derived the AGN parameters $L$ (the time-averaged luminosity) and $r_0$ (the scale radius where the bubbles start rising in the ICM). While we do not find any solution with the effervescent heating model for only one object, we do show that AGN and conduction heating are not cooperating effectively for half of the objects in our sample. For most of the clusters we find that, when a comparison is possible, the derived AGN scale radius $r_0$ and the observed AGN jet extension have the same order of magnitude. The AGN luminosities required to balance radiative losses are substantially lowered if the fact that the AGN deposits energy within a finite volume is taken into account. For the Virgo cluster, we find that the AGN power derived from the effervescent heating model is in good agreement with the observed jet power.

Rocco Piffaretti; Jelle Kaastra

2006-02-16T23:59:59.000Z

155

Detection of Nuclear X-ray Sources in Nearby Galaxies with Chandra  

E-Print Network [OSTI]

We report preliminary results from an arcsecond-resolution X-ray survey of nearby galaxies using ACIS on board Chandra. The total sample consists of 41 low-luminosity AGNs, including Seyferts, LINERs, and LINER/H II transition objects. In the initial subsample of 24 objects observed thus far, we detect in 62% of the objects a compact, pointlike source astrometrically coincident with either the optical or radio position of the nucleus. The high detection rate strongly suggests that the majority of the objects do contain weakly active, AGN-like cores, presumably powered by central massive black holes. The 2-10 keV luminosities of the nuclear sources range from 10^38 to 10^41 erg/s, with a median value of 2x10^38 erg/s. Our detection limit corresponds to 8x10^37 erg/s for the typical sample distance of 12 Mpc; this limit is two orders of magnitude fainter than the weakest sources of this kind previously studied using ASCA or BeppoSAX. The new data extend toward lower luminosities the known linear correlation bet...

Ho, L C; Townsley, L K; Sambruna, R M; Garmire, G P; Brandt, W N; Filippenko, A V; Griffiths, R E; Ptak, A F; Sargent, W L W; Ho, Luis C.; Feigelson, Eric D.; Townsley, Leisa K.; Sambruna, Rita M.; Garmire, Gordon P.; Filippenko, Alexei V.; Griffiths, Richard E.; Ptak, Andrew F.; Sargent, Wallace L. W.

2001-01-01T23:59:59.000Z

156

PROPERTIES OF NEARBY STARBURST GALAXIES BASED ON THEIR DIFFUSE GAMMA-RAY EMISSION  

SciTech Connect (OSTI)

The physical relationship between the far-infrared and radio fluxes of star-forming galaxies has yet to be definitively determined. The favored interpretation, the 'calorimeter model', requires that supernova generated cosmic-ray (CR) electrons cool rapidly via synchrotron radiation. However, this cooling should steepen their radio spectra beyond what is observed, and so enhanced ionization losses at low energies from high gas densities are also required. Further, evaluating the minimum energy magnetic field strength with the traditional scaling of the synchrotron flux may underestimate the true value in massive starbursts if their magnetic energy density is comparable to the hydrostatic pressure of their disks. Gamma-ray spectra of starburst galaxies, combined with radio data, provide a less ambiguous estimate of these physical properties in starburst nuclei. While the radio flux is most sensitive to the magnetic field, the GeV gamma-ray spectrum normalization depends primarily on gas density. To this end, spectra above 100 MeV were constructed for two nearby starburst galaxies, NGC 253 and M82, using Fermi data. Their nuclear radio and far-infrared spectra from the literature are compared to new models of the steady-state CR distributions expected from starburst galaxies. Models with high magnetic fields, favoring galaxy calorimetry, are overall better fits to the observations. These solutions also imply relatively high densities and CR ionization rates, consistent with molecular cloud studies.

Paglione, Timothy A. D.; Abrahams, Ryan D., E-mail: paglione@york.cuny.edu [Department of Earth and Physical Sciences, York College, City University of New York, 94-20 Guy R. Brewer Blvd., Jamaica, NY 11451 (United States)

2012-08-20T23:59:59.000Z

157

Vorticity generation in creeping flow past a magnetic obstacle Centro de Investigacin en Energa, UNAM, Apartado Postal 34, Temixco, Morelos 62580, Mexico  

E-Print Network [OSTI]

Vorticity generation in creeping flow past a magnetic obstacle S. Cuevas* Centro de Investigación Mechanical & Aerospace Engineering Department, UCLA, 44-114 Engineering IV, Los Angeles, California 90095 The generation of vorticity in the two-dimensional creeping flow of an incompressible, electrically conduct- ing

Abdou, Mohamed

158

The Effectiveness of Emergency Preparedness Animal Issues Education: Perceived Advantages and Obstacles of Roles Played By Texas AgriLife Extension Service Agents  

E-Print Network [OSTI]

THE EFFECTIVENESS OF EMERGENCY PREPAREDNESS ANIMAL ISSUES EDUCATION: PERCEIVED ADVANTAGES AND OBSTACLES OF ROLES PLAYED BY TEXAS AGRILIFE EXTENSION SERVICE AGENTS By RICK MAXWELL, B.S., M.S. A DISSERTATION IN AGRICULTURAL EDUCATION...-Chairperson of the Committee David Lawver Andy Vestal Accepted Fred Hartmeister Dean of the Graduate School May, 2010 Copyright 2010, Rick Maxwell Texas Tech University, Rick...

Maxwell, Ricky G.

2010-07-14T23:59:59.000Z

159

CONSTRAINTS ON PLANET OCCURRENCE AROUND NEARBY MID-TO-LATE M DWARFS FROM THE MEARTH PROJECT  

SciTech Connect (OSTI)

The MEarth Project is a ground-based photometric survey intended to find planets transiting the closest and smallest main-sequence stars. In its first four years, MEarth discovered one transiting exoplanet, the 2.7 R{sub ?} planet GJ1214b. Here, we answer an outstanding question: in light of the bounty of small planets transiting small stars uncovered by the Kepler mission, should MEarth have found more than just one planet so far? We estimate MEarth's ensemble sensitivity to exoplanets by performing end-to-end simulations of 1.25 × 10{sup 6} observations of 988 nearby mid-to-late M dwarfs, gathered by MEarth between 2008 October and 2012 June. For 2-4 R{sub ?} planets, we compare this sensitivity to results from Kepler and find that MEarth should have found planets at a rate of 0.05-0.36 planets yr{sup –1} in its first four years. As part of this analysis, we provide new analytic fits to the Kepler early M dwarf planet occurrence distribution. When extrapolating between Kepler's early M dwarfs and MEarth's mid-to-late M dwarfs, we find that assuming the planet occurrence distribution stays fixed with respect to planetary equilibrium temperature provides a good match to our detection of a planet with GJ1214b's observed properties. For larger planets, we find that the warm (600-700 K), Neptune-sized (4 R{sub ?}) exoplanets that transit early M dwarfs like Gl436 and GJ3470 occur at a rate of <0.15 star{sup –1} (at 95% confidence) around MEarth's later M dwarf targets. We describe a strategy with which MEarth can increase its expected planet yield by 2.5 × without new telescopes by shifting its sensitivity toward the smaller and cooler exoplanets that Kepler has demonstrated to be abundant.

Berta, Zachory K.; Irwin, Jonathan; Charbonneau, David, E-mail: zberta@cfa.harvard.edu [Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138 (United States)

2013-10-01T23:59:59.000Z

160

Starbursts and the triggering of the activity in nearby powerful radio galaxies  

E-Print Network [OSTI]

We present high quality long-slit spectra for three nearby powerful radio galaxies 3C293, 3C305, PKS1345+12. These were taken with the aim of characterising the young stellar populations (YSP), and thereby investigating the evolution of the host galaxies, as well as the events that triggered the activity. Isochrone spectral synthesis modelling of the wide wavelength coverage spectra of nuclear and off-nuclear continuum-emitting regions have been used to estimate the ages, masses and luminosities of the YSP component, taking full account of reddening effects and potential contamination by activity-related components. We find that the YSP make a substantial contribution to the continuum flux in the off-nuclear regions on a radial scale of 1 - 20kpc in all three objects. Moreover, in two objects we find evidence for reddened post-starburst stellar populations in the near-nuclear regions of the host galaxies. The YSP are relatively old (0.1- 2Gyr), massive and make up a large proportion (~1 - 50%) of the total stellar mass in the regions of galaxies sampled by the observations. Overall, these results are consistent with the idea that AGN activity in some radio galaxies is triggered by major gas-rich mergers. Therefore, these radio galaxies form part of the subset of early-type galaxies that is evolving most rapidly in the local universe. Intriguingly, the results also suggest that the radio jets are triggered relatively late in the merger sequence, and that there is an evolutionary link between radio galaxies and luminous/ultra-luminous infrared galaxies.

C. Tadhunter; T. G. Robinson; R. M. Gonzalez Delgado; K. Wills; R. Morganti

2004-10-05T23:59:59.000Z

Note: This page contains sample records for the topic "tall obstacles nearby" 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

THE ACS NEARBY GALAXY SURVEY TREASURY. XI. THE REMARKABLY UNDISTURBED NGC 2403 DISK  

SciTech Connect (OSTI)

We present detailed analysis of color-magnitude diagrams of NGC 2403, obtained from a deep (m {approx}< 28) Hubble Space Telescope (HST) Wide Field Planetary Camera 2 observation of the outer disk of NGC 2403, supplemented by several shallow (m {approx}< 26) HST Advanced Camera for Surveys fields. We derive the spatially resolved star formation history of NGC 2403 out to 11 disk scale lengths. In the inner portions of the galaxy, we compare the recent star formation rates (SFRs) we derive from the resolved stars with those measured using GALEX FUV + Spitzer 24{mu} fluxes, finding excellent agreement between the methods. Our measurements also show that the radial gradient in recent SFR mirrors the disk exponential profile to 11 scale lengths with no break, extending to SFR densities a factor of {approx}100 lower than those that can be measured with GALEX and Spitzer ({approx}2 Multiplication-Sign 10{sup -6} M{sub Sun} yr{sup -1} kpc{sup -2}). Furthermore, we find that the cumulative stellar mass of the disk was formed at similar times at all radii. We compare these characteristics of NGC 2403 to those of its ''morphological twins'', NGC 300 and M 33, showing that the structure and age distributions of the NGC 2403 disk are more similar to those of the relatively isolated system NGC 300 than to those of the Local Group analog M 33. We also discuss the environments and HI morphologies of these three nearby galaxies, comparing them to integrated light studies of larger samples of more distant galaxy disks. Taken together, the physical properties and evolutionary history of NGC 2403 suggest that the galaxy has had no close encounters with other M 81 group members and may be falling into the group for the first time.

Williams, Benjamin F.; Dalcanton, Julianne J.; Stilp, Adrienne; Radburn-Smith, David [Department of Astronomy, Box 351580, University of Washington, Seattle, WA 98195 (United States); Dolphin, Andrew [Raytheon, 1151 E. Hermans Road, Tucson, AZ 85706 (United States); Skillman, Evan D., E-mail: ben@astro.washington.edu, E-mail: jd@astro.washington.edu, E-mail: adrienne@astro.washington.edu, E-mail: dolphin@raytheon.com, E-mail: skillman@astro.umn.edu [Department of Astronomy, University of Minnesota, 116 Church St. SE, Minneapolis, MN 55455 (United States)

2013-03-10T23:59:59.000Z

162

OBSERVATIONAL CONSTRAINTS ON THE MOLECULAR GAS CONTENT IN NEARBY STARBURST DWARF GALAXIES  

SciTech Connect (OSTI)

Using star formation histories derived from optically resolved stellar populations in 19 nearby starburst dwarf galaxies observed with the Hubble Space Telescope, we measure the stellar mass surface densities of stars newly formed in the bursts. By assuming a star formation efficiency (SFE), we then calculate the inferred gas surface densities present at the onset of the starbursts. Assuming an SFE of 1%, as is often assumed in normal star-forming galaxies, and assuming that the gas was purely atomic, translates to very high H I surface densities ({approx}10{sup 2}-10{sup 3} M{sub Sun} pc{sup -2}), which are much higher than have been observed in dwarf galaxies. This implies either higher values of SFE in these dwarf starburst galaxies or the presence of significant amounts of H{sub 2} in dwarfs (or both). Raising the assumed SFEs to 10% or greater (in line with observations of more massive starbursts associated with merging galaxies), still results in H I surface densities higher than observed in 10 galaxies. Thus, these observations appear to require that a significant fraction of the gas in these dwarf starbursts galaxies was in the molecular form at the onset of the bursts. Our results imply molecular gas column densities in the range 10{sup 19}-10{sup 21} cm{sup -2} for the sample. In the galaxies where CO observations have been made, these densities correspond to values of the CO-H{sub 2} conversion factor (X{sub CO}) in the range >(3-80) Multiplication-Sign 10{sup 20} cm{sup -2} (K km s{sup -1}){sup -1}, or up to 40 Multiplication-Sign greater than Galactic X{sub CO} values.

McQuinn, Kristen B. W.; Skillman, Evan D. [Department of Astronomy, School of Physics and Astronomy, 116 Church Street, S.E., University of Minnesota, Minneapolis, MN 55455 (United States); Dalcanton, Julianne J.; Weisz, Daniel R.; Williams, Benjamin F. [Department of Astronomy, Box 351580, University of Washington, Seattle, WA 98195 (United States); Dolphin, Andrew E. [Raytheon Company, 1151 E. Hermans Road, Tucson, AZ 85756 (United States); Cannon, John M. [Department of Physics and Astronomy, Macalester College, 1600 Grand Avenue, Saint Paul, MN 55105 (United States); Holtzman, Jon, E-mail: kmcquinn@astro.umn.edu [Department of Astronomy, New Mexico State University, Box 30001, Department 4500, 1320 Frenger Street, Las Cruces, NM 88003 (United States)

2012-06-01T23:59:59.000Z

163

THE STAR CLUSTER SYSTEM IN THE NEARBY STARBURST GALAXY M82  

SciTech Connect (OSTI)

We present a photometric study of star clusters in the nearby starburst galaxy M82 based on the UBVI-, YJ- and H-band Hubble Space Telescope images. We find 1105 star clusters with V < 23 mag. Of those, 1070 are located in the disk region, while 35 star clusters are in the halo region. The star clusters in the disk are composed of a dominant blue population with a color peak at (B - V){sub 0} Almost-Equal-To 0.45, and a weaker red population. The luminosity function of the disk clusters shows a power-law distribution with a power-law index {alpha} = -2.04 {+-} 0.03, and the scale height of their distribution is h{sub z} = 9.''64 {+-} 0.''40 (164 {+-} 7 pc), similar to that of the stellar thin disk of M82. We have derived the ages of {approx}630 star clusters using the spectral energy distribution fit method by comparing UBVI(YJ)H-band photometric data with the simple stellar population models. The age distribution of the disk clusters shows that the most dominant cluster population has ages ranging from 100 Myr to 1 Gyr, with a peak at about 500 Myr. This suggests that M82 has undergone a disk-wide star formation about 500 Myr ago, probably through the interaction with M81. The brightest star clusters in the nuclear region are much brighter than those in other regions, indicating that more massive star clusters are formed in the denser environments. On the other hand, the colors of the halo clusters are similar to those of globular clusters in the Milky Way, and their ages are estimated to be older than 1 Gyr. These are probably genuine old globular clusters in M82.

Lim, Sungsoon; Lee, Myung Gyoon [Astronomy Program, Department of Physics and Astronomy, Seoul National University, Seoul 151-747 (Korea, Republic of)] [Astronomy Program, Department of Physics and Astronomy, Seoul National University, Seoul 151-747 (Korea, Republic of); Hwang, Narae, E-mail: slim@astro.snu.ac.kr, E-mail: mglee@astro.snu.ac.kr, E-mail: nhwang@kasi.re.kr [Korea Astronomy and Space Science Institute, Daejeon 305-348 (Korea, Republic of)] [Korea Astronomy and Space Science Institute, Daejeon 305-348 (Korea, Republic of)

2013-03-20T23:59:59.000Z

164

FINDING {eta} CAR ANALOGS IN NEARBY GALAXIES USING SPITZER. I. CANDIDATE SELECTION  

SciTech Connect (OSTI)

The late-stage evolution of the most massive stars such as {eta} Carinae is controlled by the effects of mass loss, which may be dominated by poorly understood eruptive mass ejections. Understanding this population is challenging because no true analogs of {eta} Car have been clearly identified in the Milky Way or other galaxies. We utilize Spitzer IRAC images of seven nearby ({approx}< 4 Mpc) galaxies to search for such analogs. We find 34 candidates with a flat or rising mid-IR spectral energy distributions toward longer mid-infrared wavelengths that emit >10{sup 5} L{sub Sun} in the IRAC bands (3.6 to 8.0 {mu}m) and are not known to be background sources. Based on our estimates for the expected number of background sources, we expect that follow-up observations will show that most of these candidates are not dust enshrouded massive stars, with an expectation of only 6 {+-} 6 surviving candidates. Since we would detect true analogs of {eta} Car for roughly 200 years post-eruption, this implies that the rate of eruptions like {eta} Car is less than the core-collapse supernova rate. It is possible, however, that every M > 40 M{sub Sun} star undergoes such eruptions given our initial results. In Paper II we will characterize the candidates through further analysis and follow-up observations, and there is no barrier to increasing the galaxy sample by an order of magnitude. The primary limitation of the present search is that Spitzer's resolution limits us to the shorter wavelength IRAC bands. With the James Webb Space Telescope, such surveys can be carried out at the far more optimal wavelengths of 10-30 {mu}m, allowing identification of {eta} Car analogs for millennia rather than centuries post-eruption.

Khan, Rubab; Stanek, K. Z.; Kochanek, C. S., E-mail: khan@astronomy.ohio-state.edu, E-mail: kstanek@astronomy.ohio-state.edu, E-mail: ckochanek@astronomy.ohio-state.edu [Department of Astronomy, The Ohio State University, 140 W. 18th Ave., Columbus, OH 43210 (United States)

2013-04-10T23:59:59.000Z

165

The ESO Nearby Abell Cluster Survey VIII. Morphological and spectral classification of galaxies  

E-Print Network [OSTI]

We have determined the morphological types of 2295 galaxies from the ESO Nearby Abell Cluster Survey (ENACS) from CCD images made with the Dutch telescope on La Silla. The reliability of our classification appears to be quite comparable to that of other classifiers. Recalibration of the ENACS spectral classification shows that early- and late- type galaxies can be distinguished from their spectra with 83% reliability. Ellipticals and S0 galaxies cannot be distinguished spectrally, while spectral classification of late spirals has a reliability of 70%. We derive average pseudo-colors and linestrengths from the ENACS spectra for the galaxies of different morphological types, considering bright (M -20) subsets of the galaxies without emission lines (non-ELG) separately. We find a strong and significant correlation between the average color and the average strength of the metal absorption lines. The average metallicity decreases and the average color gets bluer towards later Hubble type. In each morphological class the faint galaxies are bluer and less metal-rich than the bright ones. This extends the well-established color-magnitude relation of early-type galaxies to (late) spirals. Bright early spirals may, on average, have somewhat stronger H-delta absorption than the other galaxies, which could be due to recent starformation. The galaxies with emission lines (ELG) have a bluer spectral continuum than the non-ELG, and the amount of blueing hardly depends on morphological type. The fraction of ELG depends strongly on morphological type but it varies very little with projected distance from the cluster center.

T. Thomas; P. Katgert

2005-10-10T23:59:59.000Z

166

BAYESIAN ANALYSIS TO IDENTIFY NEW STAR CANDIDATES IN NEARBY YOUNG STELLAR KINEMATIC GROUPS  

SciTech Connect (OSTI)

We present a new method based on a Bayesian analysis to identify new members of nearby young kinematic groups. The analysis minimally takes into account the position, proper motion, magnitude, and color of a star, but other observables can be readily added (e.g., radial velocity, distance). We use this method to find new young low-mass stars in the {beta} Pictoris and AB Doradus moving groups and in the TW Hydrae, Tucana-Horologium, Columba, Carina, and Argus associations. Starting from a sample of 758 mid-K to mid-M (K5V-M5V) stars showing youth indicators such as H{alpha} and X-ray emission, our analysis yields 214 new highly probable low-mass members of the kinematic groups analyzed. One is in TW Hydrae, 37 in {beta} Pictoris, 17 in Tucana-Horologium, 20 in Columba, 6 in Carina, 50 in Argus, 32 in AB Doradus, and the remaining 51 candidates are likely young but have an ambiguous membership to more than one association. The false alarm rate for new candidates is estimated to be 5% for {beta} Pictoris and TW Hydrae, 10% for Tucana-Horologium, Columba, Carina, and Argus, and 14% for AB Doradus. Our analysis confirms the membership of 58 stars proposed in the literature. Firm membership confirmation of our new candidates will require measurement of their radial velocity (predicted by our analysis), parallax, and lithium 6708 A equivalent width. We have initiated these follow-up observations for a number of candidates, and we have identified two stars (2MASSJ01112542+1526214, 2MASSJ05241914-1601153) as very strong candidate members of the {beta} Pictoris moving group and one strong candidate member (2MASSJ05332558-5117131) of the Tucana-Horologium association; these three stars have radial velocity measurements confirming their membership and lithium detections consistent with young age.

Malo, Lison; Doyon, Rene; Lafreniere, David; Artigau, Etienne; Gagne, Jonathan; Baron, Frederique [Departement de physique and Observatoire du Mont-Megantic, Universite de Montreal, Montreal, QC H3C 3J7 (Canada)] [Departement de physique and Observatoire du Mont-Megantic, Universite de Montreal, Montreal, QC H3C 3J7 (Canada); Riedel, Adric, E-mail: malo@astro.umontreal.ca, E-mail: doyon@astro.umontreal.ca, E-mail: david@astro.umontreal.ca, E-mail: artigau@astro.umontreal.ca, E-mail: gagne@astro.umontreal.ca, E-mail: baron@astro.umontreal.ca, E-mail: riedel@phy-astr.gsu.edu [Department of Astrophysics, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024 (United States)] [Department of Astrophysics, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024 (United States)

2013-01-10T23:59:59.000Z

167

WISEP J180026.60+013453.1: A NEARBY LATE-L DWARF NEAR THE GALACTIC PLANE  

SciTech Connect (OSTI)

We report a nearby L7.5 dwarf discovered using the Preliminary Data Release of the Wide-field Infrared Survey Explorer (WISE) and the Two Micron All Sky Survey. WISEP J180026.60+013453.1 has a motion of 0.42 arcsec yr{sup -1} and an estimated distance of 8.8 {+-} 1.0 pc. With this distance, it currently ranks as the sixth closest known L dwarf, although a trigonometric parallax is needed to confirm this distance. It was previously overlooked because it lies near the Galactic plane (b = 12 Degree-Sign ). As a relatively bright and nearby late L dwarf with normal near-infrared colors, W1800+0134 will serve as a benchmark for studies of cloud-related phenomena in cool substellar atmospheres.

Gizis, John E.; Castro, Philip J. [Department of Physics and Astronomy, University of Delaware, Newark, DE 19716 (United States); Burgasser, Adam J. [Center for Astrophysics and Space Science, University of California San Diego, La Jolla, CA 92093 (United States); Faherty, Jacqueline K.; Shara, Michael M. [Department of Astrophysics, American Museum of Natural History, New York, NY 10034 (United States)

2011-11-15T23:59:59.000Z

168

Regulation of Tall Structures (Indiana)  

Broader source: Energy.gov [DOE]

A permit from the Department of Transportation is required for the construction or alteration of any structure higher than 200 feet above ground level, or structures near airports, highways,...

169

Dark Matter Searches with Cherenkov Telescopes: Nearby Dwarf Galaxies or Local Galaxy Clusters?  

SciTech Connect (OSTI)

In this paper, we compare dwarf galaxies and galaxy clusters in order to elucidate which object class is the best target for gamma-ray DM searches with imaging atmospheric Cherenkov telescopes (IACTs). We have built a mixed dwarfs+clusters sample containing some of the most promising nearby dwarf galaxies (Draco, Ursa Minor, Wilman 1 and Segue 1) and local galaxy clusters (Perseus, Coma, Ophiuchus, Virgo, Fornax, NGC 5813 and NGC 5846), and then compute their DM annihilation flux profiles by making use of the latest modeling of their DM density profiles. We also include in our calculations the effect of DM substructure. Willman 1 appears as the best candidate in the sample. However, its mass modeling is still rather uncertain, so probably other candidates with less uncertainties and quite similar fluxes, namely Ursa Minor and Segue 1, might be better options. As for galaxy clusters, Virgo represents the one with the highest flux. However, its large spatial extension can be a serious handicap for IACT observations and posterior data analysis. Yet, other local galaxy cluster candidates with more moderate emission regions, such as Perseus, may represent good alternatives. After comparing dwarfs and clusters, we found that the former exhibit annihilation flux profiles that, at the center, are roughly one order of magnitude higher than those of clusters, although galaxy clusters can yield similar, or even higher, integrated fluxes for the whole object once substructure is taken into account. Even when any of these objects are strictly point-like according to the properties of their annihilation signals, we conclude that dwarf galaxies are best suited for observational strategies based on the search of point-like sources, while galaxy clusters represent best targets for analyses that can deal with rather extended emissions. Finally, we study the detection prospects for present and future IACTs in the framework of the constrained minimal supersymmetric standard model. We find that the level of the annihilation flux from these targets is below the sensitivities of current IACTs and the future CTA.

Sanchez-Conde, Miguel A.; /KIPAC, Menlo Park /SLAC /IAC, La Laguna /Laguna U., Tenerife; Cannoni, Mirco; /Huelva U.; Zandanel, Fabio; /IAA, Granada; Gomez, Mario E.; /Huelva U.; Prada, Francisco; /IAA, Granada

2012-06-06T23:59:59.000Z

170

ALFALFA Discovery of the Nearby Gas-Rich Dwarf Galaxy Leo~P. III. An Extremely Metal Deficient Galaxy  

E-Print Network [OSTI]

We present KPNO 4-m and LBT/MODS spectroscopic observations of an HII region in the nearby dwarf irregular galaxy Leo P discovered recently in the Arecibo ALFALFA survey. In both observations, we are able to accurately measure the temperature sensitive [O III] 4363 Angstrom line and determine a "direct" oxygen abundance of 12 + log(O/H) = 7.17 +/- 0.04. Thus, Leo P is an extremely metal deficient (XMD) galaxy, and, indeed, one of the most metal deficient star-forming galaxies ever observed. For its estimated luminosity, Leo P is consistent with the relationship between luminosity and oxygen abundance seen in nearby dwarf galaxies. Leo P shows normal alpha element abundance ratios (Ne/O, S/O, and Ar/O) when compared to other XMD galaxies, but elevated N/O, consistent with the "delayed release" hypothesis for N/O abundances. We derive a helium mass fraction of 0.2509 +0.0184 -0.0123 which compares well with the WMAP + BBN prediction of 0.2483 +/- 0.0002 for the primordial helium abundance. We suggest that surve...

Skillman, Evan D; Berg, Danielle A; Pogge, Richard W; Haurberg, Nathalie C; Cannon, John M; Aver, Erik; Olive, Keith A; Giovanelli, Riccardo; Haynes, Martha P; Adams, Elizabeth A K; McQuinn, Kristen B W; Rhode, Katherine L

2013-01-01T23:59:59.000Z

171

NEAT, An Astrometric Telescope To Probe Planetary Systems Down To The Earth Mass Around Nearby Solar-Type Stars  

E-Print Network [OSTI]

The NEAT (Nearby Earth Astrometric Telescope) mission is a proposition submitted to ESA for its 2010 call for M-size mission. The main scientific goal is to detect and characterize planetary systems in an exhaustive way down to 1 Earth mass in the habitable zone and further away, around nearby stars for F, G, and K spectral types. This survey would provide the actual planetary masses, the full characterization of the orbits including their inclination, for all the components of the planetary system down to that mass limit. Extremely- high-precision astrometry, in space, can detect the dynamical effect due to even low mass orbiting planets on their central star, reaching those scientific goals. NEAT will continue the work performed by Hipparcos (1mas precision) and Gaia (7{\\mu}as aimed) by reaching a precision that is improved by two orders of magnitude (0.05{\\mu}as, 1{\\sigma} accuracy). The two modules of the payload, the telescope and the focal plane, must be placed 40m away leading to a formation flying opt...

Malbet, F; Goullioud, R; Shao, M; Lagage, P -O; Cara, C; Durand, G; Feautrier, P; Jakobsson, B; Hinglais, E; Mercier, M

2011-01-01T23:59:59.000Z

172

The Star Formation History in Nearby Dwarf Galaxies: the Fossil Record in the Color-Magnitude Diagram  

E-Print Network [OSTI]

Dwarf galaxies may play a key role in the formation and evolution of bigger systems. This make a topic of major interest knowing how they form and evolve and, in particular, how their star formation histories (SFHs) have proceed since their birth. For nearby galaxies, the color-magnitude diagram (CMD) contains stars formed over all their lifetime. It is hence a fossil record of their SFHs. The analysis with synthetic CMDs provides a powerful tool to retrieve them. In this paper, I discuss the critical issues related to the computation of synthetic CMDs, present a short summary of the currently available results for the SFH extending the full life of galaxies and make a few critical considerations about the powerfulness and back-draws of the method.

A. Aparicio

1998-11-11T23:59:59.000Z

173

SDSS J141624.08+134826.7: A NEARBY BLUE L DWARF FROM THE SLOAN DIGITAL SKY SURVEY  

SciTech Connect (OSTI)

We present the discovery of a bright (J = 13.1 mag) nearby L6 dwarf found in a search for L-type ultracool subdwarfs in the Sloan Digital Sky Survey (SDSS) Data Release 7. SDSS J141624.08+134826.7 exhibits blue near-infrared colors compared to other optically typed L6 objects, but its optical and near-infrared spectra do not show metal-poor features characteristic of known L-type ultracool subdwarfs. Instead, SDSS J141624.08+134826.7 is probably a nearby example of the class of L dwarfs with low condensate opacities that exhibit unusually blue near-infrared colors for a given spectral type. Its deep 1.4 and 1.9 {mu}m H{sub 2}O absorption bands, weak 2.3 {mu}m CO feature, strong 0.99 {mu}m FeH band, and shallow optical TiO and CaH bands resemble the spectra of other blue L dwarfs which are believed to have unusually thin or large-grained cloud structure. The luminosity of SDSS J141624.08+134826.7 implies that it is either a high-mass brown dwarf or a low-mass star, depending on its age, and its UVW space motion suggests a thin-disk membership. With a spectrophotometric distance of 8.4 +- 1.9 pc, SDSS J141624.08+134826.7 is one of the nearest L dwarfs to the Sun and is therefore an excellent target for high resolution imaging, spectroscopic, and astrometric follow-up observations.

Bowler, Brendan P. [Infrared Telescope Facility, National Aeronautics and Space Administration, Science Mission Directorate, Planetary Astronomy Program (United States); Liu, Michael C.; Dupuy, Trent J., E-mail: bpbowler@ifa.hawaii.ed [Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822 (United States)

2010-02-10T23:59:59.000Z

174

CAIRNS: The Cluster And Infall Region Nearby Survey III. Environmental Dependence of H-alpha Properties of Galaxies  

E-Print Network [OSTI]

We investigate the environmental dependence of star formation in cluster virial regions and infall regions as part of CAIRNS (Cluster And Infall Region Nearby Survey), a large spectroscopic survey of the infall regions surrounding nine nearby rich clusters of galaxies. Our long-slit spectroscopy yields estimates of star formation rates in environments from cluster cores to the general large-scale structure. The fraction of galaxies with current star formation in their inner disks as traced by H-alpha emission increases with distance from the cluster and converges to the ``field'' value only at 2-3 virial radii, in agreement with other investigations. However, among galaxies with significant current star formation (EW[Ha]geq2\\AA), there is no difference in the distribution of EW[Ha] inside and outside the virial radius. This surprising result, first seen by Carter et al., suggests that (1) star formation is truncated on either very short timescales or only at moderate and high redshifts or (2) that projection effects contaminate the measurement. The number density profiles of star-forming and non-star-forming galaxies indicate that, among galaxies projected inside the virial radius, at least half of the former and 20% of the latter are ``infall interlopers,'' galaxies in the infall region but outside the virial region. The kinematics of star-forming galaxies in the infall region closely match those of absorption-dominated galaxies. This result shows that the star forming galaxies in the infall regions are not interlopers from the field and excludes one model of the backsplash scenario of galaxy transformation. Finally, we quantify systematic uncertainties in estimating the global star formation in galaxies from their inner disks.

Kenneth Rines; Margaret J. Geller; Michael J. Kurtz; Antonaldo Diaferio

2005-06-27T23:59:59.000Z

175

Theorizing the carbon economy: introduction to the special issue The term `carbon economy'often has an adjective placed nearby: the `new'carbon economy,  

E-Print Network [OSTI]

of carbon capture and storage and nuclear technologies. These dimensionsöand surface-level to deeperTheorizing the carbon economy: introduction to the special issue The term `carbon economy'often has an adjective placed nearby: the `new'carbon economy, the `low' carbon economy, the carbon `neutral' economy

176

THE ADVANCED CAMERA FOR SURVEYS NEARBY GALAXY SURVEY TREASURY. VI. THE ANCIENT STAR-FORMING DISK OF NGC 404  

SciTech Connect (OSTI)

We present HST/WFPC2 observations across the disk of the nearby isolated dwarf S0 galaxy NGC 404, which hosts an extended gas disk. The locations of our fields contain a roughly equal mixture of bulge and disk stars. All of our resolved stellar photometry reaches m {sub F814W} = 26 (M {sub F814W} = -1.4), which covers 2.5 mag of the red giant branch and main-sequence stars with ages <300 Myr. Our deepest field reaches m {sub F814W} = 27.2 (M {sub F814W} = -0.2), sufficient to resolve the red clump and main-sequence stars with ages <500 Myr. Although we detect trace amounts of star formation at times more recent than 10 Gyr ago for all fields, the proportion of red giant stars to asymptotic giants and main-sequence stars suggests that the disk is dominated by an ancient (>10 Gyr) population. Detailed modeling of the color-magnitude diagram suggests that {approx}70% of the stellar mass in the NGC 404 disk formed by z {approx} 2 (10 Gyr ago) and at least {approx}90% formed prior to z {approx} 1 (8 Gyr ago). These results indicate that the stellar populations of the NGC 404 disk are on average significantly older than those of other nearby disk galaxies, suggesting that early- and late-type disks may have different long-term evolutionary histories, not simply differences in their recent star formation rates. Comparisons of the spatial distribution of the young stellar mass and FUV emission in Galaxy Evolution Explorer images show that the brightest FUV regions contain the youngest stars, but that some young stars (<160 Myr) lie outside of these regions. FUV luminosity appears to be strongly affected by both age and stellar mass within individual regions. Finally, we use our measurements to infer the relationship between the star formation rate and the gas density of the disk at previous epochs. We find that most of the history of the NGC 404 disk is consistent with star formation that has decreased with the gas density according to the Schmidt law. However, {approx} 0.5-1 Gyr ago, the star formation rate was unusually low for the inferred gas density, consistent with the possibility that there was a gas accretion event that reignited star formation {approx}0.5 Gyr ago. Such an event could explain why this S0 galaxy hosts an extended gas disk.

Williams, Benjamin F.; Dalcanton, Julianne J.; Gilbert, Karoline M.; Stilp, Adrienne [Department of Astronomy, Box 351580, University of Washington, Seattle, WA 98195 (United States); Dolphin, Andrew [Raytheon, 1151 E. Hermans Road, Tucson, AZ 85706 (United States); Seth, Anil C. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Weisz, Daniel; Skillman, Evan, E-mail: ben@astro.washington.ed, E-mail: jd@astro.washington.ed, E-mail: stephanie@astro.washington.ed, E-mail: roskar@astro.washington.ed, E-mail: dolphin@raytheon.co, E-mail: aseth@cfa.harvard.ed, E-mail: dweisz@astro.umn.ed, E-mail: skillman@astro.umn.ed [Department of Astronomy, University of Minnesota, 116 Church Street SE, Minneapolis, MN 55455 (United States)

2010-06-10T23:59:59.000Z

177

XRF 100316D/SN 2010bh: clue to the diverse origin of nearby supernova-associated GRBs  

E-Print Network [OSTI]

X-ray Flash (XRF) 100316D, a nearby super-long under-luminous burst with a peak energy E_p \\sim 20 keV, was detected by Swift and was found to be associated with an energetic supernova SN 2010bh. Both the spectral and the temporal behavior of this burst are rather similar to that of XRF 060218, except that the latter was associated with a "less energetic" SN 2006aj and had a prominent soft thermal emission component in the spectrum. We analyze the spectral and temporal properties of this burst, and interpret the prompt gamma-ray emission and the early X-ray plateau emission as synchrotron emission from a dissipating Poynting-flux-dominated outflow, probably powered by a magnetar with a spin period of $P \\sim 10$ ms and the polar cap magnetic field $B_{\\rm p} \\sim 3\\times 10^{15}$ G. The energetic supernova SN 2010bh associated with this burst is, however, difficult to interpret within the slow magnetar model, which implies that the nascent magnetar may spin much faster with an initial rotation period $\\sim 1$...

Fan, Yi-Zhong; Xu, Dong; Liang, En-Wei; Zhang, Bing

2010-01-01T23:59:59.000Z

178

Far-infrared distributions in nearby spiral galaxies NGC2841 and NGC2976 observed with AKARI/FIS  

E-Print Network [OSTI]

Far-infrared (IR) images of the nearby Sb galaxy NGC2841 and the Sc galaxy NGC2976 at wavelengths of 65, 90, 140, and 160 um have been obtained with the Far-Infrared Surveyor (FIS) onboard AKARI. Both galaxies reveal similar morphologies of dust rings. They are, however, significantly different in the dust temperature: a cold (21 K) ring for NGC2841 and a warm (30 K) ring for NGC2976, which presumably reflects the difference in the origin of the ring structure for the different Hubble type of the galaxy. In addition to the dust ring structure, a warm dust component is detected from the central region of NGC2841, which may be attributed to the heating by its Low-Ionization Nuclear Emission-line Region nucleus. As for NGC2976, an extended dust component is observed along the minor axis, which shows a distribution somewhat asymmetrical to the galactic disk; this might be associated with the HI bridge in the M81/M82 group that NGC2976 belongs to. By taking advantage of a wealth of the far-IR bands of the FIS, it is demonstrated that the spectral energy distribution of NGC2841 is spatially more variable than that of NGC2976.

H. Kaneda; T. Suzuki; T. Onaka; Y. Doi; M. Kawada; B. -C. Koo; S. Makiuti; T. Nakagawa; Y. Okada; S. Serjeant; H. Shibai; M. Shirahata

2007-06-01T23:59:59.000Z

179

The Heating of Mid-Infrared Dust in the Nearby Galaxy M33: A Testbed for Tracing Galaxy Evolution  

E-Print Network [OSTI]

Because the 8 {\\mu}m polycyclic aromatic hydrocarbon (PAH) emission has been found to correlate with other well-known star formation tracers, it has widely been used as a star formation rate (SFR) tracer. There are, however, studies that challenge the accuracy and reliability of the 8 {\\mu}m emission as a SFR tracer. Our study, part of the Herschel M33 Extended Survey (HERM33ES) open time key program, aims at addressing this issue by analyzing the infrared emission from the nearby spiral galaxy M33 at the high spatial scale of 75 pc. Combining data from the Herschel Space Observatory and the Spitzer Space Telescope we find that the 8 {\\mu}m emission is better correlated with the 250 {\\mu}m emission, which traces cold interstellar gas, than with the 24 {\\mu}m emission. The L(8)/L(24) ratio is highly depressed in 24 {\\mu}m luminous regions, which correlate with known HII regions. We also compare our results with the dust emission models by Draine & Li (2007). We confirm that the depression of 8 {\\mu}m PAH e...

Calapa, M; Draine, B T; Boquien, M; Kramer, C; Xilouris, M; Verley, S; Braine, J; Relaño-Pastor, M; van der Werf, P; Israel, F; Hermelo, I; Albrecht, M

2014-01-01T23:59:59.000Z

180

NEW M, L, AND T DWARF COMPANIONS TO NEARBY STARS FROM THE WIDE-FIELD INFRARED SURVEY EXPLORER  

SciTech Connect (OSTI)

We present 11 candidate late-type companions to nearby stars identified with data from the Wide-field Infrared Survey Explorer (WISE) and the Two Micron All Sky Survey (2MASS). Eight of the candidates are likely to be companions based on their common proper motions with the primaries. The remaining three objects are rejected as companions, one of which is a free-floating T7 dwarf. Spectral types are available for five of the companions, which consist of M2V, M8.5V, L5, T8, and T8. Based on their photometry, the unclassified companions are probably two mid-M dwarfs and one late-M/early-L dwarf. One of the T8 companions, WISE J142320.84+011638.0, has already been reported by Pinfield and coworkers. The other T8 companion, ULAS J095047.28+011734.3, was discovered by Burningham and coworkers through the United Kingdom Infrared Telescope Infrared Deep Sky Survey, but its companionship has not been previously recognized in the literature. The L5 companion, 2MASS J17430860+8526594, is a new member of a class of L dwarfs that exhibit unusually blue near-IR colors. Among the possible mechanisms that have been previously proposed for the peculiar colors of these L dwarfs, low metallicity does not appear to be a viable explanation for 2MASS J17430860+8526594 since our spectrum of the primary suggests that its metallicity is not significantly subsolar.

Luhman, Kevin L.; Loutrel, Nicholas P.; McCurdy, Nicholas S.; Melso, Nicole D.; Star, Kimberly M.; Terrien, Ryan C. [Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802 (United States); Mace, Gregory N.; McLean, Ian S. [UCLA Division of Astronomy and Astrophysics, Los Angeles, CA 90095 (United States); Young, Michael D.; Rhode, Katherine L. [Department of Astronomy, Indiana University, Swain West 319, 727 East Third Street, Bloomington, IN 47405 (United States); Davy Kirkpatrick, J., E-mail: kluhman@astro.psu.edu [Infrared Processing and Analysis Center, MS 100-22, California Institute of Technology, Pasadena, CA 91125 (United States)

2012-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "tall obstacles nearby" 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

The Solar Neighborhood XXXVI: The Long-Term Photometric Variability of Nearby Red Dwarfs in the VRI Optical Bands  

E-Print Network [OSTI]

We present an analysis of long-term photometric variability for nearby red dwarfs at optical wavelengths. The sample consists of 264 M dwarfs south of DEC = +30 with V-K = 3.96-9.16 and Mv~10-20 (spectral types M2V-M8V), most of which are within 25 pc. The stars have been observed in the VRI filters for ~4-14 years at the CTIO/SMARTS 0.9m telescope. Of the 238 red dwarfs within 25 pc, we find that only ~8% are photometrically variable by at least 20 mmag (~2%) in the VRI bands. We find that high variability at optical wavelengths over the long-term can be used to identify young stars. Overall, however, the fluxes of most red dwarfs at optical wavelengths are steady to a few percent over the long term. The low overall rate of photometric variability for red dwarfs is consistent with results found in previous work on similar stars on shorter timescales, with the body of work indicating that most red dwarfs are only mildly variable. We highlight 17 stars that show long-term changes in brightness, sometimes becau...

Hosey, Altonio D; Jao, Wei-Chun; Dieterich, Sergio B; Winters, Jennifer G; Lurie, John C; Riedel, Adric R; Subasavage, John P

2015-01-01T23:59:59.000Z

182

The nearby supernova factory  

E-Print Network [OSTI]

cadence gives fewer supernovae but better constraints on thein 2003. Key words: supernovae, galaxies Preprint submitted2004 Introduction Type Ia supernovae (SNe Ia) have proven

2004-01-01T23:59:59.000Z

183

THE ACS NEARBY GALAXY SURVEY TREASURY. IX. CONSTRAINING ASYMPTOTIC GIANT BRANCH EVOLUTION WITH OLD METAL-POOR GALAXIES  

SciTech Connect (OSTI)

In an attempt to constrain evolutionary models of the asymptotic giant branch (AGB) phase at the limit of low masses and low metallicities, we have examined the luminosity functions and number ratios between AGB and red giant branch (RGB) stars from a sample of resolved galaxies from the ACS Nearby Galaxy Survey Treasury. This database provides Hubble Space Telescope optical photometry together with maps of completeness, photometric errors, and star formation histories for dozens of galaxies within 4 Mpc. We select 12 galaxies characterized by predominantly metal-poor populations as indicated by a very steep and blue RGB, and which do not present any indication of recent star formation in their color-magnitude diagrams. Thousands of AGB stars brighter than the tip of the RGB (TRGB) are present in the sample (between 60 and 400 per galaxy), hence, the Poisson noise has little impact in our measurements of the AGB/RGB ratio. We model the photometric data with a few sets of thermally pulsing AGB (TP-AGB) evolutionary models with different prescriptions for the mass loss. This technique allows us to set stringent constraints on the TP-AGB models of low-mass, metal-poor stars (with M < 1.5 M{sub sun}, [Fe/H]{approx}< -1.0). Indeed, those which satisfactorily reproduce the observed AGB/RGB ratios have TP-AGB lifetimes between 1.2 and 1.8 Myr, and finish their nuclear burning lives with masses between 0.51 and 0.55 M{sub sun}. This is also in good agreement with recent observations of white dwarf masses in the M4 old globular cluster. These constraints can be added to those already derived from Magellanic Cloud star clusters as important mileposts in the arduous process of calibrating AGB evolutionary models.

Girardi, Leo [Osservatorio Astronomico di Padova-INAF, Vicolo dell'Osservatorio 5, I-35122 Padova (Italy); Williams, Benjamin F.; Gilbert, Karoline M.; Rosenfield, Philip; Dalcanton, Julianne J. [Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195 (United States); Marigo, Paola [Dipartimento di Astronomia, Universita di Padova, Vicolo dell'Osservatorio 2, I-35122 Padova (Italy); Boyer, Martha L. [Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States); Dolphin, Andrew [Raytheon Company, 1151 East Hermans Road, Tucson, AZ 85756 (United States); Weisz, Daniel R.; Skillman, Evan [Department of Astronomy, University of Minnesota, 116 Church Street SE, Minneapolis, MN 55455 (United States); Melbourne, Jason [Caltech Optical Observatories, Division of Physics, Mathematics and Astronomy, Mail Stop 301-17, California Institute of Technology, Pasadena, CA 91125 (United States); Olsen, Knut A. G. [National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719 (United States); Seth, Anil C. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)

2010-12-01T23:59:59.000Z

184

THE ADVANCED CAMERA FOR SURVEYS NEARBY GALAXY SURVEY TREASURY. V. RADIAL STAR FORMATION HISTORY OF NGC 300  

SciTech Connect (OSTI)

We present new Hubble Space Telescope (HST) observations of NGC 300 taken as part of the Advanced Camera for Surveys Nearby Galaxy Survey Treasury (ANGST). Individual stars are resolved in these images down to an absolute magnitude of M{sub F814W} = 1.0 (below the red clump). We determine the star formation history of the galaxy in six radial bins by comparing our observed color-magnitude diagrams (CMDs) with synthetic CMDs based on theoretical isochrones. We find that the stellar disk out to 5.4 kpc is primarily old, in contrast with the outwardly similar galaxy M33. We determine the scale length as a function of age and find evidence for inside-out growth of the stellar disk: the scale length has increased from 1.1 +- 0.1 kpc 10 Gyr ago to 1.3 +- 0.1 kpc at present, indicating a buildup in the fraction of young stars at larger radii. As the scale length of M33 has recently been shown to have increased much more dramatically with time, our results demonstrate that two galaxies with similar sizes and morphologies can have very different histories. With an N-body simulation of a galaxy designed to be similar to NGC 300, we determine that the effects of radial migration should be minimal. We trace the metallicity gradient as a function of time and find a present-day metallicity gradient consistent with that seen in previous studies. Consistent results are obtained from archival images covering the same radial extent but differing in placement and filter combination.

Gogarten, Stephanie M.; Dalcanton, Julianne J.; Williams, Benjamin F.; Roskar, Rok; Gilbert, Karoline M.; Quinn, Thomas R. [Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195 (United States); Holtzman, Jon [Department of Astronomy, New Mexico State University, Box 30001, 1320 Frenger Street, Las Cruces, NM 88003 (United States); Seth, Anil C. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Dolphin, Andrew [Raytheon Company, 1151 East Hermans Road, Tucson, AZ 85756 (United States); Weisz, Daniel; Skillman, Evan [Department of Astronomy, University of Minnesota, 116 Church Street SE, Minneapolis, MN 55455 (United States); Cole, Andrew [School of Mathematics and Physics, University of Tasmania, Hobart, Tasmania (Australia); Debattista, Victor P. [Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE (United Kingdom); Olsen, Knut [National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719 (United States); De Jong, Roelof S. [Astrophysikalisches Institut Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam (Germany); Karachentsev, Igor D., E-mail: stephanie@astro.washington.ed [Special Astrophysical Observatory, Nizhnij Arkhyz, KChR (Russian Federation)

2010-04-01T23:59:59.000Z

185

THE ADVANCED CAMERA FOR SURVEYS NEARBY GALAXY SURVEY TREASURY. IV. THE STAR FORMATION HISTORY OF NGC 2976  

SciTech Connect (OSTI)

We present resolved stellar photometry of NGC 2976 obtained with the Advanced Camera for Surveys (ACS) as part of the ACS Nearby Galaxy Survey Treasury (ANGST) program. The data cover the radial extent of the major axis of the disk out to 6 kpc, or approx6 scale lengths. The outer disk was imaged to a depth of M{sub F606W} approx 1, and an inner field was imaged to the crowding limit at a depth of M{sub F606W} approx -1. Through detailed analysis and modeling of the resulting color-magnitude diagrams, we have reconstructed the star formation history (SFH) of the stellar populations currently residing in these portions of the galaxy, finding similar ancient populations at all radii but significantly different young populations at increasing radii. In particular, outside of the well-measured break in the disk surface brightness profile, the age of the youngest population increases with distance from the galaxy center, suggesting that star formation is shutting down from the outside-in. We use our measured SFH, along with H I surface density measurements, to reconstruct the surface density profile of the disk during previous epochs. Comparisons between the recovered star formation rates and reconstructed gas densities at previous epochs are consistent with star formation following the Schmidt law during the past 0.5 Gyr, but with a drop in star formation efficiency at low gas densities, as seen in local galaxies at the present day. The current rate and gas density suggest that rapid star formation in NGC 2976 is currently in the process of ceasing from the outside-in due to gas depletion. This process of outer disk gas depletion and inner disk star formation was likely triggered by an interaction with the core of the M81 group approx>1 Gyr ago that stripped the gas from the galaxy halo and/or triggered gas inflow from the outer disk toward the galaxy center.

Williams, Benjamin F.; Dalcanton, Julianne J.; Stilp, Adrienne; Gilbert, Karoline M.; Roskar, Rok; Gogarten, Stephanie M. [Department of Astronomy, Box 351580, University of Washington, Seattle, WA 98195 (United States); Seth, Anil C. [CfA Fellow, Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Weisz, Daniel; Skillman, Evan [Department of Astronomy, University of Minnesota, 116 Church St. SE, Minneapolis, MN 55455 (United States); Dolphin, Andrew [Raytheon, 1151 E. Hermans Road, Tucson, AZ 85706 (United States); Holtzman, Jon, E-mail: ben@astro.washington.ed, E-mail: jd@astro.washington.ed, E-mail: roskar@astro.washington.ed, E-mail: stephanie@astro.washington.ed, E-mail: aseth@cfa.harvard.ed, E-mail: dweisz@astro.umn.ed, E-mail: skillman@astro.umn.ed, E-mail: dolphin@raytheon.co, E-mail: holtz@nmsu.ed [Department of Astronomy, New Mexico State University, Box 30001, 1320 Frenger St., Las Cruces, NM 88003 (United States)

2010-01-20T23:59:59.000Z

186

Far-Ultraviolet Spectroscopy of Star-Forming Regions in Nearby Galaxies: Stellar Populations and Abundance Indicators  

E-Print Network [OSTI]

We present FUSE spectroscopy and supporting data for star-forming regions in nearby galaxies, to examine their massive-star content and explore the use of abundance and population indicators in this spectral range for high-redshift galaxies. New far-ultraviolet spectra are shown for four bright H II regions in M33 (NGC 588, 592, 595, and 604), the H II region NGC 5461 in M101, and the starburst nucleus of NGC 7714, supplemented by the very-low-metallicity galaxy I Zw 18. In each case, we see strong Milky Way absorption systems from H2, but intrinsic absorption within each galaxy is weak or undetectable, perhaps because of the "UV bias" in which reddened stars which lie behind molecular-rich areas are also heavily reddened. We see striking changes in the stellar-wind lines from these populations with metallicity, suggesting that C II, C III, C IV, N II, N III, and P V lines are potential tracers of stellar metallicity in star-forming galaxies. Three of these relations - involving N IV, C III, and P V - are nearly linear over the range from O/H=0.05--0.8 solar. The major difference in continuum shapes among these systems is that the giant H II complex NGC 604 has a stronger continuum shortward of 950 A than any other object in this sample. Small-number statistics would likely go in the other direction; we favor this as the result of a discrete star-forming event ~3 Myr ago, as suggested by previous studies of its stellar population. (Supported by NASA grant NAG5-8959)

William C. Keel; Jay B. Holberg; Patrick M. Treuthardt

2004-03-20T23:59:59.000Z

187

RESOLVED GIANT MOLECULAR CLOUDS IN NEARBY SPIRAL GALAXIES: INSIGHTS FROM THE CANON CO (1-0) SURVEY  

SciTech Connect (OSTI)

We resolve 182 individual giant molecular clouds (GMCs) larger than 2.5 Multiplication-Sign 10{sup 5} M{sub Sun} in the inner disks of 5 large nearby spiral galaxies (NGC 2403, NGC 3031, NGC 4736, NGC 4826, and NGC 6946) to create the largest such sample of extragalactic GMCs within galaxies analogous to the Milky Way. Using a conservatively chosen sample of GMCs most likely to adhere to the virial assumption, we measure cloud sizes, velocity dispersions, and {sup 12}CO (J = 1-0) luminosities and calculate cloud virial masses. The average conversion factor from CO flux to H{sub 2} mass (or X{sub CO}) for each galaxy is 1-2 Multiplication-Sign 10{sup 20} cm{sup -2} (K km s{sup -1}){sup -1}, all within a factor of two of the Milky Way disk value ({approx}2 Multiplication-Sign 10{sup 20} cm{sup -2} (K km s{sup -1}){sup -1}). We find GMCs to be generally consistent within our errors between the galaxies and with Milky Way disk GMCs; the intrinsic scatter between clouds is of order a factor of two. Consistent with previous studies in the Local Group, we find a linear relationship between cloud virial mass and CO luminosity, supporting the assumption that the clouds in this GMC sample are gravitationally bound. We do not detect a significant population of GMCs with elevated velocity dispersions for their sizes, as has been detected in the Galactic center. Though the range of metallicities probed in this study is narrow, the average conversion factors of these galaxies will serve to anchor the high metallicity end of metallicity-X{sub CO} trends measured using conversion factors in resolved clouds; this has been previously possible primarily with Milky Way measurements.

Donovan Meyer, Jennifer; Koda, Jin; Mooney, Thomas [Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794 (United States); Momose, Rieko [Department of Astronomy, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan); Egusa, Fumi [Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Chuo-ku, Sagamihara, Kanagawa 252-5210 (Japan); Carty, Misty [Department of Astronomy, University of Maryland, College Park, MD 20742 (United States); Kennicutt, Robert [Institute of Astronomy, University of Cambridge, Cambridge CB3 0HA (United Kingdom); Kuno, Nario [Nobeyama Radio Observatory, Minamimaki, Minamisaku, Nagano, 384-1305 (Japan); Rebolledo, David; Wong, Tony [Astronomy Department, University of Illinois, Urbana, IL 61801 (United States); Sawada, Tsuyoshi [National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588 (Japan); Scoville, Nick [Department of Astronomy, California Institute of Technology, Pasadena, CA 91125 (United States)

2013-08-01T23:59:59.000Z

188

THE Pa{alpha} LUMINOSITY FUNCTION OF H II REGIONS IN NEARBY GALAXIES FROM HST/NICMOS  

SciTech Connect (OSTI)

The H II region luminosity function (LF) is an important tool for deriving the birthrates and mass distribution of OB associations and is an excellent tracer of the newly formed massive stars and associations. To date, extensive work (predominantly in H{alpha}) has been done from the ground, which is hindered by dust extinction and the severe blending of adjacent (spatially or in projection) H II regions. Reliably measuring the properties of H II regions requires a linear resolution <40 pc, but analyses satisfying this requirement have been done only in a handful of galaxies, so far. As the first space-based work using a galaxy sample, we have selected 12 galaxies from our HST/NICMOS Pa{alpha} survey and studied the LF and size distribution of H II regions both in individual galaxies and cumulatively, using a virtually extinction-free tracer of the ionizing photon rate. The high angular resolution and low sensitivity to diffuse emission of NICMOS also offer an advantage over ground-based imaging by enabling a higher degree of de-blending of the H II regions. We do not confirm the broken power-law LFs found in ground-based studies. Instead, we find that the LFs, both individual and co-added, follow a single power law dN(L)/dln L{proportional_to}L {sup -1}, are consistent with the mass function of star clusters in nearby galaxies, and are in agreement with the results of the existing analyses with Hubble Space Telescope (HST) data. The individual and co-added size distributions of H II regions are both roughly consistent with dN(D)/dln D{proportional_to}D {sup -3}, but the power-law scaling is probably contaminated by blended regions or complexes.

Liu Guilin; Calzetti, Daniela [Astronomy Department, University of Massachusetts, Amherst, MA 01003 (United States); Kennicutt, Robert C. Jr. [Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA (United Kingdom); Schinnerer, Eva [MPI for Astronomy, Koenigstuhl 17, D-69117 Heidelberg (Germany); Sofue, Yoshiaki [Department of Physics, Meisei University, 2-1-1 Hodokubo, Hino, Tokyo 191-8506 (Japan); Komugi, Shinya [Joint ALMA Office, Alonso de Cordova 3107, Vitacura, Santiago 763-0355 (Chile); Egusa, Fumi [Institute of Space and Aeronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshino-dai, Chuo-ku, Sagamihara, Kanagawa 252-5210 (Japan); Scoville, Nicholas Z., E-mail: liu@pha.jhu.edu [California Institute of Technology, MC 249-17, Pasadena, CA 91125 (United States)

2013-07-20T23:59:59.000Z

189

INFRARED SPECTROSCOPIC SURVEY OF THE QUIESCENT MEDIUM OF NEARBY CLOUDS. I. ICE FORMATION AND GRAIN GROWTH IN LUPUS  

SciTech Connect (OSTI)

Infrared photometry and spectroscopy (1-25 ?m) of background stars reddened by the Lupus molecular cloud complex are used to determine the properties of grains and the composition of ices before they are incorporated into circumstellar envelopes and disks. H{sub 2}O ices form at extinctions of A{sub K} = 0.25 ± 0.07 mag (A{sub V} = 2.1 ± 0.6). Such a low ice formation threshold is consistent with the absence of nearby hot stars. Overall, the Lupus clouds are in an early chemical phase. The abundance of H{sub 2}O ice (2.3 ± 0.1 × 10{sup –5} relative to N{sub H}) is typical for quiescent regions, but lower by a factor of three to four compared to dense envelopes of young stellar objects. The low solid CH{sub 3}OH abundance (<3%-8% relative to H{sub 2}O) indicates a low gas phase H/CO ratio, which is consistent with the observed incomplete CO freeze out. Furthermore it is found that the grains in Lupus experienced growth by coagulation. The mid-infrared (>5 ?m) continuum extinction relative to A{sub K} increases as a function of A{sub K}. Most Lupus lines of sight are well fitted with empirically derived extinction curves corresponding to R{sub V} ? 3.5 (A{sub K} = 0.71) and R{sub V} ? 5.0 (A{sub K} = 1.47). For lines of sight with A{sub K} > 1.0 mag, the ?{sub 9.7}/A{sub K} ratio is a factor of two lower compared to the diffuse medium. Below 1.0 mag, values scatter between the dense and diffuse medium ratios. The absence of a gradual transition between diffuse and dense medium-type dust indicates that local conditions matter in the process that sets the ?{sub 9.7}/A{sub K} ratio. This process is likely related to grain growth by coagulation, as traced by the A{sub 7.4}/A{sub K} continuum extinction ratio, but not to ice mantle formation. Conversely, grains acquire ice mantles before the process of coagulation starts.

Boogert, A. C. A. [IPAC, NASA Herschel Science Center, Mail Code 100-22, California Institute of Technology, Pasadena, CA 91125 (United States); Chiar, J. E. [SETI Institute, Carl Sagan Center, 189 Bernardo Avenue, Mountain View, CA 94043 (United States); Knez, C.; Mundy, L. G. [Department of Astronomy, University of Maryland, College Park, MD 20742 (United States); Öberg, K. I. [Departments of Chemistry and Astronomy, University of Virginia, Charlottesville, VA 22904 (United States); Pendleton, Y. J. [Solar System Exploration Research Virtual Institute, NASA Ames Research Center, Moffett Field, CA 94035 (United States); Tielens, A. G. G. M.; Van Dishoeck, E. F., E-mail: aboogert@ipac.caltech.edu [Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden (Netherlands)

2013-11-01T23:59:59.000Z

190

Pushmataha Forest Habitat Research Area TALL TIMBERS  

E-Print Network [OSTI]

. Determine the effects of fire and fire frequency on post oak and blackjack oak acorn production, crown vigor monitored other than through pellet count data on the FHRA. Plots were laid out and fire guards bladed

Balasundaram, Balabhaskar "Baski"

191

Effect of nearby Pearl vortices upon the Ic versus B characteristics of planar Josephson junctions in thin and narrow superconducting strips  

SciTech Connect (OSTI)

In this paper I show how to calculate the effect of a nearby Pearl vortex or antivortex upon the critical current I{sub c}(B) when a perpendicular magnetic induction B is applied to a planar Josephson junction in a long, thin, superconducting strip of width W much less than the Pearl length {Lambda} = 2{lambda}2/d, where {lambda} is the London penetration depth and d is the thickness (d < {lambda}). The theoretical results provide a qualitative explanation of unusual features recently observed experimentally by Golod et al. [ Phys. Rev. Lett. 104 227003 (2010)] in a device with a similar geometry.

Clem, John R.

2011-10-03T23:59:59.000Z

192

CARMA SURVEY TOWARD INFRARED-BRIGHT NEARBY GALAXIES (STING). III. THE DEPENDENCE OF ATOMIC AND MOLECULAR GAS SURFACE DENSITIES ON GALAXY PROPERTIES  

SciTech Connect (OSTI)

We investigate the correlation between CO and H I emission in 18 nearby galaxies from the CARMA Survey Toward IR-Bright Nearby Galaxies (STING) at sub-kpc and kpc scales. Our sample, spanning a wide range in stellar mass and metallicity, reveals evidence for a metallicity dependence of the H I column density measured in regions exhibiting CO emission. Such a dependence is predicted by the equilibrium model of McKee and Krumholz, which balances H{sub 2} formation and dissociation. The observed H I column density is often smaller than predicted by the model, an effect we attribute to unresolved clumping, although values close to the model prediction are also seen. We do not observe H I column densities much larger than predicted, as might be expected were there a diffuse H I component that did not contribute to H{sub 2} shielding. We also find that the H{sub 2} column density inferred from CO correlates strongly with the stellar surface density, suggesting that the local supply of molecular gas is tightly regulated by the stellar disk.

Wong, Tony; Xue, Rui [Department of Astronomy, University of Illinois, Urbana, IL 61801 (United States)] [Department of Astronomy, University of Illinois, Urbana, IL 61801 (United States); Bolatto, Alberto D.; Fisher, David B.; Vogel, Stuart N. [Department of Astronomy, University of Maryland, College Park, MD 20742 (United States)] [Department of Astronomy, University of Maryland, College Park, MD 20742 (United States); Leroy, Adam K. [National Radio Astronomy Observatory, Charlottesville, VA 22903 (United States)] [National Radio Astronomy Observatory, Charlottesville, VA 22903 (United States); Blitz, Leo [Department of Astronomy, University of California, Berkeley, CA 94720 (United States)] [Department of Astronomy, University of California, Berkeley, CA 94720 (United States); Rosolowsky, Erik [Department of Physics, University of Alberta, Edmonton, AB T6G 2E1 (Canada)] [Department of Physics, University of Alberta, Edmonton, AB T6G 2E1 (Canada); Bigiel, Frank [Institut für theoretische Astrophysik, Zentrum für Astronomie der Universität Heidelberg, Albert-Ueberle Str. 2, D-69120 Heidelberg (Germany)] [Institut für theoretische Astrophysik, Zentrum für Astronomie der Universität Heidelberg, Albert-Ueberle Str. 2, D-69120 Heidelberg (Germany); Ott, Jürgen [National Radio Astronomy Observatory, Socorro, NM 87801 (United States)] [National Radio Astronomy Observatory, Socorro, NM 87801 (United States); Rahman, Nurur [Department of Physics, C1 Lab 140, University of Johannesburg, P.O. Box 524, Auckland Park, Johannesburg 2006 (South Africa)] [Department of Physics, C1 Lab 140, University of Johannesburg, P.O. Box 524, Auckland Park, Johannesburg 2006 (South Africa); Walter, Fabian [Max-Planck-Institut für Astronomie, Konigstuhl 17, D-69117 Heidelberg (Germany)] [Max-Planck-Institut für Astronomie, Konigstuhl 17, D-69117 Heidelberg (Germany)

2013-11-01T23:59:59.000Z

193

Influence of the Fin on Two-Dimensional Characteristics of Dispersed Flow With Wall Liquid Film in the Vicinity of Obstacle  

SciTech Connect (OSTI)

Spacers have positive effects on the heat transfer enhancement and critical heat flux (CHF) increase downstream of their location in the boiling channel. These effects are further increased by the inclusion of the fin on the spacer rear edge. Numerical simulation of a separation in a high void gas phase and dispersed droplets flow around a spacer, with a liquid film flowing on the wall, is performed. Mechanisms leading to the CHF increase due to the two-phase flow separation and liquid film thickening downstream the spacer are demonstrated. Numerical simulations of gas phase, entrained droplets and wall liquid film flows were performed with the three-fluid model and with the application of the high order numerical scheme for the liquid film surface interface tracking. Predicted is a separation of gas and entrained droplets streams around the spacer without and with a fin inclined 30 and 60 degrees to the wall, as well as a change of wall liquid film thickness in the vicinity of spacer. Results of liquid film dynamic behaviour are compared with the recently obtained experimental results. Multi-dimensional characteristics of surface waves on the liquid film were measured with newly developed ultrasonic transmission technique in a 3 3 rod bundle test section with air-water flow under atmospheric conditions. Obtained numerical results are in good agreement with experimental observations. The presented investigation gives insight into the complex mechanisms of separated two-phase flow with wall liquid film around the spacer and support thermal-hydraulic design and optimisation of flow obstacles in various thermal equipment. (authors)

Stosic, Zoran V. [Framatome ANP GmbH, P.O. Box 3220, 91050 Erlangen (Germany); Stevanovic, Vladimir D. [University of Belgrade, Kraljice Marije 16, 11000 Belgrade, Serbia and Montenegro (Yugoslavia); Serizawa, Akimi [Kyoto University, Kumatori, Sennan, Osaka 590-0494 (Japan)

2002-07-01T23:59:59.000Z

194

Vision-based obstacle avoidance  

DOE Patents [OSTI]

A method for allowing a robot to avoid objects along a programmed path: first, a field of view for an electronic imager of the robot is established along a path where the electronic imager obtains the object location information within the field of view; second, a population coded control signal is then derived from the object location information and is transmitted to the robot; finally, the robot then responds to the control signal and avoids the detected object.

Galbraith, John (Los Alamos, NM)

2006-07-18T23:59:59.000Z

195

Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I  

E-Print Network [OSTI]

We have embarked on a project, under the aegis of the Nearby Stars (NStars)/ Space Interferometry Mission Preparatory Science Program to obtain spectra, spectral types, and, where feasible, basic physical parameters for the 3600 dwarf and giant stars earlier than M0 within 40 parsecs of the sun. In this paper we report on the results of this project for the first 664 stars in the northern hemisphere. These results include precise, homogeneous spectral types, basic physical parameters (including the effective temperature, surface gravity and the overall metallicity, [M/H]) and measures of the chromospheric activity of our program stars. Observed and derived data presented in this paper are also available on the project's website at http://stellar.phys.appstate.edu/ .

R. O. Gray; C. J. Corbally; R. F. Garrison; M. T. McFadden; P. E. Robinson

2003-08-11T23:59:59.000Z

196

THE ACS NEARBY GALAXY SURVEY TREASURY. VII. THE NGC 4214 STARBURST AND THE EFFECTS OF STAR FORMATION HISTORY ON DWARF MORPHOLOGY  

SciTech Connect (OSTI)

We present deep Hubble Space Telescope WFPC2 optical observations obtained as part of the ACS Nearby Galaxy Survey Treasury as well as early release Wide Field Camera 3 ultraviolet and infrared observations of the nearby dwarf starbursting galaxy NGC 4214. Our data provide a detailed example of how covering such a broad range in wavelength provides a powerful tool for constraining the physical properties of stellar populations. The deepest data reach the ancient red clump at M{sub F814W} {approx} - 0.2. All of the optical data reach the main-sequence turnoff for stars younger than {approx}300 Myr and the blue He-burning sequence for stars younger than 500 Myr. The full color-magnitude diagram (CMD) fitting analysis shows that all three fields in our data set are consistent with {approx}75% of the stellar mass being older than 8 Gyr, in spite of showing a wide range in star formation rates at present. Thus, our results suggest that the scale length of NGC 4214 has remained relatively constant for many gigayears. As previously noted by others, we also find the galaxy has recently ramped up production consistent with its bright UV luminosity and its population of UV-bright massive stars. In the central field we find UV point sources with F336W magnitudes as bright as -9.9. These are as bright as stars with masses of at least 52-56 M{sub sun} and ages near 4 Myr in stellar evolution models. Assuming a standard initial mass function, our CMD is well fitted by an increase in star formation rate beginning 100 Myr ago. The stellar populations of this late-type dwarf are compared with those of NGC 404, an early-type dwarf that is also the most massive galaxy in its local environment. The late-type dwarf appears to have a similar high fraction of ancient stars, suggesting that these dominant galaxies may form at early epochs even if they have low total mass and very different present-day morphologies.

Williams, Benjamin F.; Dalcanton, Julianne J.; Gilbert, Karoline M.; Weisz, Daniel R. [Department of Astronomy, Box 351580, University of Washington, Seattle, WA 98195 (United States); Seth, Anil C. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Skillman, Evan D. [Department of Astronomy, University of Minnesota, 116 Church Street SE, Minneapolis, MN 55455 (United States); Dolphin, Andrew E., E-mail: ben@astro.washington.edu, E-mail: jd@astro.washington.edu, E-mail: kgilbert@astro.washington.edu, E-mail: dweisz@astro.washington.edu, E-mail: aseth@cfa.harvard.edu, E-mail: skillman@astro.umn.edu, E-mail: adolphin@raytheon.com [Raytheon, 1151 E. Hermans Road, Tucson, AZ 85756 (United States)

2011-07-01T23:59:59.000Z

197

THE CO-TO-H{sub 2} CONVERSION FACTOR AND DUST-TO-GAS RATIO ON KILOPARSEC SCALES IN NEARBY GALAXIES  

SciTech Connect (OSTI)

We present ?kiloparsec spatial resolution maps of the CO-to-H{sub 2} conversion factor (?{sub CO}) and dust-to-gas ratio (DGR) in 26 nearby, star-forming galaxies. We have simultaneously solved for ?{sub CO} and the DGR by assuming that the DGR is approximately constant on kiloparsec scales. With this assumption, we can combine maps of dust mass surface density, CO-integrated intensity, and H I column density to solve for both ?{sub CO} and the DGR with no assumptions about their value or dependence on metallicity or other parameters. Such a study has just become possible with the availability of high-resolution far-IR maps from the Herschel key program KINGFISH, {sup 12}CO J = (2-1) maps from the IRAM 30 m large program HERACLES, and H I 21 cm line maps from THINGS. We use a fixed ratio between the (2-1) and (1-0) lines to present our ?{sub CO} results on the more typically used {sup 12}CO J = (1-0) scale and show using literature measurements that variations in the line ratio do not affect our results. In total, we derive 782 individual solutions for ?{sub CO} and the DGR. On average, ?{sub CO} = 3.1 M{sub ?} pc{sup –2} (K km s{sup –1}){sup –1} for our sample with a standard deviation of 0.3 dex. Within galaxies, we observe a generally flat profile of ?{sub CO} as a function of galactocentric radius. However, most galaxies exhibit a lower ?{sub CO} value in the central kiloparsec—a factor of ?2 below the galaxy mean, on average. In some cases, the central ?{sub CO} value can be factors of 5-10 below the standard Milky Way (MW) value of ?{sub CO,{sub MW}} = 4.4 M{sub ?} pc{sup –2} (K km s{sup –1}){sup –1}. While for ?{sub CO} we find only weak correlations with metallicity, the DGR is well-correlated with metallicity, with an approximately linear slope. Finally, we present several recommendations for choosing an appropriate ?{sub CO} for studies of nearby galaxies.

Sandstrom, K. M.; Walter, F. [Max Planck Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg (Germany); Leroy, A. K. [National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903 (United States); Bolatto, A. D.; Wolfire, M. [Department of Astronomy, University of Maryland, College Park, MD 20742 (United States); Croxall, K. V.; Crocker, A. [Department of Physics and Astronomy, Mail Drop 111, University of Toledo, 2801 West Bancroft Street, Toledo, OH 43606 (United States); Draine, B. T.; Aniano, G. [Princeton University Observatory, Peyton Hall, Princeton, NJ 08544-1001 (United States); Wilson, C. D. [Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1 (Canada); Calzetti, D. [Department of Astronomy, University of Massachusetts, Amherst, MA 01003 (United States); Kennicutt, R. C.; Galametz, M. [Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA (United Kingdom); Donovan Meyer, J. [Department of Physics and Astronomy, SUNY Stony Brook, Stony Brook, NY 11794-3800 (United States); Usero, A. [Observatorio Astronómico Nacional, Alfonso XII, 3, E-28014 Madrid (Spain); Bigiel, F. [Institut für theoretische Astrophysik, Zentrum für Astronomie der Universität Heidelberg, Albert-Ueberle Str. 2, D-69120 Heidelberg (Germany); Brinks, E. [Centre for Astrophysics Research, University of Hertfordshire, Hatfield AL10 9AB (United Kingdom); De Blok, W. J. G. [ASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990-AA Dwingeloo (Netherlands); Dale, D. [Department of Physics and Astronomy, University of Wyoming, Laramie, WY 82071 (United States); Engelbracht, C. W., E-mail: sandstrom@mpia.de [Steward Observatory, University of Arizona, Tucson, AZ 85721 (United States); and others

2013-11-01T23:59:59.000Z

198

A SEARCH FOR L/T TRANSITION DWARFS WITH Pan-STARRS1 AND WISE: DISCOVERY OF SEVEN NEARBY OBJECTS INCLUDING TWO CANDIDATE SPECTROSCOPIC VARIABLES  

SciTech Connect (OSTI)

We present initial results from a wide-field (30,000 deg{sup 2}) search for L/T transition brown dwarfs within 25 pc using the Pan-STARRS1 and Wide-field Infrared Survey Explorer (WISE) surveys. Previous large-area searches have been incomplete for L/T transition dwarfs, because these objects are faint in optical bands and have near-infrared (near-IR) colors that are difficult to distinguish from background stars. To overcome these obstacles, we have cross-matched the Pan-STARRS1 (optical) and WISE (mid-IR) catalogs to produce a unique multi-wavelength database for finding ultracool dwarfs. As part of our initial discoveries, we have identified seven brown dwarfs in the L/T transition within 9-15 pc of the Sun. The L9.5 dwarf PSO J140.2308+45.6487 and the T1.5 dwarf PSO J307.6784+07.8263 (both independently discovered by Mace et al.) show possible spectroscopic variability at the Y and J bands. Two more objects in our sample show evidence of photometric J-band variability, and two others are candidate unresolved binaries based on their spectra. We expect our full search to yield a well-defined, volume-limited sample of L/T transition dwarfs that will include many new targets for study of this complex regime. PSO J307.6784+07.8263 in particular may be an excellent candidate for in-depth study of variability, given its brightness (J = 14.2 mag) and proximity (11 pc)

Best, William M. J.; Liu, Michael C.; Magnier, Eugene A.; Aller, Kimberly M.; Burgett, W. S.; Chambers, K. C.; Hodapp, K. W.; Kaiser, N.; Kudritzki, R.-P.; Morgan, J. S.; Tonry, J. L.; Wainscoat, R. J. [Institute for Astronomy, University of Hawaii at Manoa, Honolulu, HI 96822 (United States); Deacon, Niall R. [Max Planck Institute for Astronomy, Koenigstuhl 17, D-69117 Heidelberg (Germany); Dupuy, Trent J. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Redstone, Joshua [Facebook, 335 Madison Ave, New York, NY 10017-4677 (United States); Price, P. A., E-mail: wbest@ifa.hawaii.edu [Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544 (United States)

2013-11-10T23:59:59.000Z

199

Finding $\\eta$ Car Analogs in Nearby Galaxies Using Spitzer: II. Identification of An Emerging Class of Extragalactic Self-Obscured Stars  

E-Print Network [OSTI]

Understanding the late-stage evolution of the most massive stars such as $\\eta$ Carinae is challenging because no true analogs of $\\eta$ Car have been clearly identified in the Milky Way or other galaxies. In Khan et. al. (2013), we utilized Spitzer IRAC images of $7$ nearby ($\\lesssim4$ Mpc) galaxies to search for such analogs, and found $34$ candidates with flat or red mid-IR spectral energy distributions. Here, in Paper II, we present our characterization of these candidates using multi-wavelength data from the optical through the far-IR. Our search detected no true analogs of $\\eta$ Car, which implies an eruption rate that is a fraction $0.01\\lesssim F \\lesssim 0.19$ of the ccSN rate. This is roughly consistent with each $M_{ZAMS} \\gtrsim 70M_\\odot$ star undergoing $1$ or $2$ outbursts in its lifetime. However, we do identify a significant population of $18$ lower luminosity $\\left(\\log(L/L_\\odot)\\simeq5.5-6.0\\right)$ dusty stars. Stars enter this phase at a rate that is fraction $0.09 \\lesssim F \\lesssim...

Khan, Rubab; Stanek, K Z; Gerke, Jill

2014-01-01T23:59:59.000Z

200

The ARAUCARIA project: Deep near-infrared survey of nearby galaxies. I. The distance to the Large Magellanic Cloud from K-band photometry of red clump stars  

E-Print Network [OSTI]

We have obtained deep imaging in the near-infrared J and K bands for 2 nearby fields in the bar of the LMC with the ESO NTT telescope, under exquisite seeing conditions. The K, J-K color-magnitude diagrams constructed from these data are of outstanding photometric quality and reveal the presence of several hundreds of red clump stars. Using the calibration of Alves for the K-band absolute magnitude of Hipparcos-observed red clump stars in the solar neigbourhood we derive a distance modulus to our observed LMC fields of 18.487 mag. Applying a correction for the tilt of the LMC bar with respect to the line of sight according to the geometrical model of van der Marel et al., the corresponding LMC barycenter distance is 18.501 mag. If we adopt a K-band population correction of -0.03 mag, as done by Alves et al. 2002, to account for the difference in age and metallicity between the solar neighborhood and LMC red clump star populations, we obtain an LMC barycenter distance modulus of 18.471 mag from our data. This is in excellent agreement with the result of Alves et al., and of another very recent study of Sarajedini et al. (2002) obtained from K-band photometry. However, we emphasize that current model predictions about the uncertainties of population corrections seem to indicate that errors up to about 0.12 mag may be possible, probably in any photometric band. Therefore, work must continue to tighten the constraints on these corrections. We also determine the mean red clump star magnitude in our LMC fields in the J band, which could be a useful alternative to the K band should future work reveal that population effect corrections for red clump stars in the J band are smaller, or more reliably determined than those for the K band.

G. Pietrzynski; W. Gieren

2002-08-07T23:59:59.000Z

Note: This page contains sample records for the topic "tall obstacles nearby" 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

A Sub-Millimeter Search of Nearby Young Stars for Cold Dust: Discovery of Debris Disks around Two Low-Mass Stars  

E-Print Network [OSTI]

(Abridged) We present results from a JCMT/SCUBA 850 um search for cold dust around nearby young stars belonging to the beta Pic (t~12 Myr) and the Local Association (t~50 Myr) moving groups. Unlike most past sub-mm studies, our sample was chosen on the basis of stellar age. Our observations achieve about an order of magnitude greater sensitivity in dust mass compared to previous work in this age range. We detected two of the three M dwarfs in our sample at 850 um, GJ 182 and GJ 803. GJ 182 may also possess a 25 um excess, indicative of warm dust in the inner few AU of its disk. For GJ 803 (AU Mic), sub-mm mapping finds that the 850 um emission is unresolved. A non-detection of the CO 3-2 line indicates the system is gas-poor, and the SED suggests the presence of a large inner disk hole (~17 AU = 1.7 arcsec in radius). These are possible indications that planets at large separations can form around M dwarfs within \\~10 Myr. In a companion paper (Kalas, Liu & Matthews 2004), we confirm the existence of a dust disk around GJ 803 using optical coronagraphic imaging. Given its youthfulness, proximity, and detectability, the GJ 803 disk will be a valuable system for studying disk, and perhaps planet, formation in great detail. Overall, sub-mm measurements of debris disks point to a drop in dust mass by a factor of about 10^3 within the first ~10 Myr, with the subsequent decline in the masses of sub-mm detected disks consistent with t^{-0.5} to t^{-1}.

Michael C. Liu; Brenda C. Matthews; Jonathan P. Williams; Paul G. Kalas

2004-04-07T23:59:59.000Z

202

THE ASYMPTOTIC GIANT BRANCH AND THE TIP OF THE RED GIANT BRANCH AS PROBES OF STAR FORMATION HISTORY: THE NEARBY DWARF IRREGULAR GALAXY KKH 98  

SciTech Connect (OSTI)

We investigate the utility of the asymptotic giant branch (AGB) and the red giant branch (RGB) as probes of the star formation history (SFH) of the nearby (D = 2.5 Mpc) dwarf irregular galaxy, KKH 98. Near-infrared (near-IR) Keck Laser Guide Star Adaptive Optics (AO) images resolve 592 IR-bright stars reaching over 1 mag below the tip of the RGB. Significantly deeper optical (F475W and F814W) Hubble Space Telescope images of the same field contain over 2500 stars, reaching to the red clump and the main-sequence turnoff for 0.5 Gyr old populations. Compared to the optical color-magnitude diagram (CMD), the near-IR CMD shows significantly tighter AGB sequences, providing a good probe of the intermediate-age (0.5-5 Gyr) populations. We match observed CMDs with stellar evolution models to recover the SFH of KKH 98. On average, the galaxy has experienced relatively constant low-level star formation (5 x 10{sup -4} M{sub sun} yr{sup -1}) for much of cosmic time. Except for the youngest main-sequence populations (age <0.1 Gyr), which are typically fainter than the AO data flux limit, the SFH estimated from the 592 IR-bright stars is a reasonable match to that derived from the much larger optical data set. Differences between the optical- and IR-derived SFHs for 0.1-1 Gyr populations suggest that current stellar evolution models may be overproducing the AGB by as much as a factor of 3 in this galaxy. At the depth of the AO data, the IR-luminous stars are not crowded. Therefore, these techniques can potentially be used to determine the stellar populations of galaxies at significantly further distances.

Melbourne, J. [Caltech Optical Observatories, Division of Physics, Mathematics and Astronomy, Mail Stop 301-17, California Institute of Technology, Pasadena, CA 91125 (United States); Williams, B.; Dalcanton, J. [Department of Astronomy, Box 351580, University of Washington, Seattle, WA 98195 (United States); Ammons, S. M.; Max, C.; Koo, D. C. [University of California Observatories/Lick Observatory, Department of Astronomy and Astrophysics, University of California at Santa Cruz, 1156 High Street, Santa Cruz, CA 95064 (United States); Girardi, Leo [Osservatorio Astronomico di Padova-INAF, Padova (Italy); Dolphin, A., E-mail: jmel@caltech.ed, E-mail: ben@astro.washington.ed, E-mail: jd@astro.washington.ed, E-mail: ammons@ucolick.or, E-mail: max@ucolick.or, E-mail: koo@ucolick.or, E-mail: leo.girardi@oapd.inaf.i, E-mail: adolphin@raytheon.co [Raytheon, 1151 E. Hermans Road, Tucson, AZ 85706 (United States)

2010-03-20T23:59:59.000Z

203

CHARACTERIZATION OF THE NEARBY L/T BINARY BROWN DWARF WISE J104915.57-531906.1 AT 2 pc FROM THE SUN  

SciTech Connect (OSTI)

WISE J104915.57-531906.1 is a L/T brown dwarf binary located 2 pc from the Sun. The pair contains the closest known brown dwarfs and is the third closest known system, stellar or sub-stellar. We report comprehensive follow-up observations of this newly uncovered system. We have determined the spectral types of both components (L8 {+-} 1, for the primary, agreeing with the discovery paper; T1.5 {+-} 2 for the secondary, which was lacking spectroscopic type determination in the discovery paper) and, for the first time, their radial velocities (V{sub rad} {approx} 23.1, 19.5 km s{sup -1}) using optical spectra obtained at the Southern African Large Telescope and other facilities located at the South African Astronomical Observatory (SAAO). The relative radial velocity of the two components is smaller than the range of orbital velocities for theoretically predicted masses, implying that they form a gravitationally bound system. We report resolved near-infrared JHK{sub S} photometry from the Infrared Survey Facility telescope at the SAAO which yields colors consistent with the spectroscopically derived spectral types. The available kinematic and photometric information excludes the possibility that the object belongs to any of the known nearby young moving groups or associations. Simultaneous optical polarimetry observations taken at the SAAO 1.9 m give a non-detection with an upper limit of 0.07%. For the given spectral types and absolute magnitudes, 1 Gyr theoretical models predict masses of 0.04-0.05 M{sub Sun} for the primary, and 0.03-0.05 M{sub Sun} for the secondary.

Kniazev, A. Y.; Vaisanen, P.; Potter, S. B.; Crawford, S.; Gulbis, A. A. S. [South African Astronomical Observatory, P.O. Box 9, 7935 Observatory, Cape Town (South Africa); Muzic, K.; Mehner, A.; Boffin, H. M. J.; Melo, C.; Ivanov, V. D.; Girard, J.; Mawet, D.; Schmidtobreick, L. [European Southern Observatory, Ave. Alonso de Cordova 3107, Casilla 19001, Santiago 19 (Chile); Kurtev, R.; Borissova, J. [Departamento de Fisica y Astronomia, Universidad de Valparaiso, Av. Gran Bretana 1111, Playa Ancha, 5030 Casilla (Chile); Huelamo, N. [CAB (INTA-CSIC), LAEFF, P.O. Box 78, E-28691 Villanueva de la Canada, Madrid (Spain); Minniti, D. [Departamento Astronomia y Astrofisica, Pontificia Universidad Catolica de Chile, Av. Vicuna Mackenna 4860, Santiago (Chile); Ishibashi, K. [Nagoya University, Nagoya (Japan); Beletsky, Y. [Las Campanas Observatory, Carnegie Institution of Washington, Colina el Pino, Casilla 601 La Serena (Chile); Buckley, D. A. H. [Southern African Large Telescope Foundation, P.O. Box 9, 7935 Observatory, Cape Town (South Africa); and others

2013-06-20T23:59:59.000Z

204

Obstacles to innovation management in SMEs.  

E-Print Network [OSTI]

?? This thesis examines innovation, innovation management and the innovation process in SMEs (small and medium enterprises). There are many academic researchers who work on… (more)

WEI, YI

2013-01-01T23:59:59.000Z

205

NUMERICAL SOLUTION OF AN INVERSE OBSTACLE ...  

E-Print Network [OSTI]

radar and sonar, geophysical exploration, medical imaging, nondestructive testing ..... Let the measurement height h = 0.15? and noise level ? = 0 be fixed and ...

2014-09-30T23:59:59.000Z

206

On smooth relaxations of obstacle sets  

E-Print Network [OSTI]

Aug 18, 2011 ... Institute of Operations Research, Karlsruhe Institute of Technology, .... quel the family of functions (?t , t > 0) will have to satisfy the following.

2011-08-18T23:59:59.000Z

207

Improving UK greenhouse gas emission estimates using tall tower observations   

E-Print Network [OSTI]

Greenhouse gases in the Earth’s atmosphere play an important role in regulating surface temperatures. The UK is signatory to international agreements that legally commit the UK to reduce its greenhouse gas emissions, and ...

Howie, James Edward

2014-06-30T23:59:59.000Z

208

TALL : rethinking the systems of the contemporary high rise  

E-Print Network [OSTI]

The life of modern work is complex. What once entailed simple activities encapsulated within simple and hierarchically designed spaces has evolved into a highly volatile and complex organism. Businesses and workers are ...

Namkung, Kenneth, 1977-

2003-01-01T23:59:59.000Z

209

Factors affecting coking pressures in tall coke ovens  

SciTech Connect (OSTI)

The detrimental effects of excessive coking pressures, resulting in the permanent deformation of coke oven walls, have been recognized for many years. Considerable research has been undertaken worldwide in attempts to define the limits within which a plant may safely operate and to quantify the factors which influence these pressures. Few full scale techniques are available for assessing the potential of a coal blend for causing wall damage. Inference of dangerous swelling pressures may be made however by the measurement of the peak gas pressure which is generated as the plastic layers meet and coalesce at the center of the oven. This pressure is referred to in this report as the carbonizing pressure. At the Dawes Lane cokemaking plant of British Steel`s Scunthorpe Works, a large database has been compiled over several years from the regulator measurement of this pressure. This data has been statistically analyzed to provide a mathematical model for predicting the carbonizing pressure from the properties of the component coals, the results of this analysis are presented in this report.

Grimley, J.J.; Radley, C.E. [British Steel plc, Scunthorpe (United Kingdom). Scunthorpe Works

1995-12-01T23:59:59.000Z

210

At 200 feet tall, the Tower at Sandia National Laboratories  

E-Print Network [OSTI]

components and systems in proposed solar thermal electrical plants planned for large-scale power generation for a variety of activities, including: · Nuclear thermal flash simulation. · Thermal performance testingkW thermal power and peak fluxes up to 1500 W/cm2. They are individually controlled to track to sun

211

Evaluation of Gas Retention in Waste Simulants: Tall Column Experiments  

SciTech Connect (OSTI)

Gas generation in Hanford’s underground waste storage tanks can lead to gas accumulation within the layer of settled solids (sludge) at the tank bottom. The gas, which typically has hydrogen as the major component together with other flammable species, is formed principally by radiation-driven chemical reactions. Accumulation of these gases within the sludge in a waste tank is undesirable and limits the amount of tank volume for waste storage. Further, accumulation of large amounts of gas in the sludge may potentially result in an unacceptable release of the accumulated gas if the sludge-layer density is reduced to less than that of the overlying sludge or that of the supernatant liquid. Rapid release of large amounts of flammable gases could endanger personnel and equipment near the tank. For this reason, a thorough understanding of the circumstances that can lead to a potentially problematic gas accumulation in sludge layers is needed. To respond to this need, the Deep Sludge Gas Release Event Program (DSGREP) was commissioned to examine gas release behavior in sludges.

Schonewill, Philip P.; Gauglitz, Phillip A.; Shimskey, Rick W.; Denslow, Kayte M.; Powell, Michael R.; Boeringa, Gregory K.; Bontha, Jagannadha R.; Karri, Naveen K.; Fifield, Leonard S.; Tran, Diana N.; Sande, Susan; Heldebrant, David J.; Meacham, Joseph E.; Smet, Dave; Bryan, Wesley E.; Calmus, Ronald B.

2014-05-16T23:59:59.000Z

212

Analysis of Alongwind Tall Building Response to Transient Nonstationary Winds  

E-Print Network [OSTI]

where the mean wind speed is characterized by a time-invariant vertical profile and a single time of time varying mean wind speed, mean wind speed vertical profile, and spatial correlation of wind flows in terms of its unique mean wind speed vertical profile, rapid time varying mean wind speed

Chen, Xinzhong

213

Negative Resists for Ultra-Tall, High Aspect Ratio Microstructures  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLas Conchas recoveryLaboratory | NationalJohn Cyber SecurityAlamos National Security,NedResists

214

Engineering SECOND YEAR Part IB Paper 8: Elective (2)  

E-Print Network [OSTI]

1 Engineering SECOND YEAR Part IB Paper 8: Elective (2) Wind Turbines Examples Paper 2 Solutions needs to sit on a 12m tower for decent winds, and 100m away from the nearest tall obstacles, but some think they're ugly and noisy. (b) In very high winds need to protect the turbine from over

Talbot, James P.

215

Off-road obstacle classification and traversability analysis in the presence of negative obstacles  

E-Print Network [OSTI]

2.5D multi-level surface map grid representation (image03], or 3D map. A 2D grid map, also known as an occupancyquick to search. The 3D grid map is made up of voxels that

Larson, Jacoby

2011-01-01T23:59:59.000Z

216

Overview of the nearby supernova factory  

E-Print Network [OSTI]

from 42 High-Redshift Supernovae,” Astrophys J. 517, pp.Observational Evidence from Supernovae for an AcceleratingCalan/Tololo Type Ia Supernovae,” Astron. J. 112, p. 2391,

2002-01-01T23:59:59.000Z

217

Lithium Depletion of Nearby Young Stellar Associations  

E-Print Network [OSTI]

We estimate cluster ages from lithium depletion in five pre-main-sequence groups found within 100 pc of the Sun: TW Hydrae Association, Eta Chamaeleontis Cluster, Beta Pictoris Moving Group, Tucanae-Horologium Association and AB Doradus Moving Group. We determine surface gravities, effective temperatures and lithium abundances for over 900 spectra through least squares fitting to model-atmosphere spectra. For each group, we compare the dependence of lithium abundance on temperature with isochrones from pre-main-sequence evolutionary tracks to obtain model dependent ages. We find that the Eta Chamaelontis Cluster and the TW Hydrae Association are the youngest, with ages of 12+/-6 Myr and 12+/-8 Myr, respectively, followed by the Beta Pictoris Moving Group at 21+/-9 Myr, the Tucanae-Horologium Association at 27+/-11 Myr, and the AB Doradus Moving Group at an age of at least 45 Myr (where we can only set a lower limit since the models -- unlike real stars -- do not show much lithium depletion beyond this age). Here, the ordering is robust, but the precise ages depend on our choice of both atmospheric and evolutionary models. As a result, while our ages are consistent with estimates based on Hertzsprung-Russell isochrone fitting and dynamical expansion, they are not yet more precise. Our observations do show that with improved models, much stronger constraints should be feasible: the intrinsic uncertainties, as measured from the scatter between measurements from different spectra of the same star, are very low: around 10 K in effective temperature, 0.05 dex in surface gravity, and 0.03 dex in lithium abundance.

Erin Mentuch; Alexis Brandeker; Marten H. van Kerkwijk; Ray Jayawardhana; Peter H. Hauschildt

2008-08-26T23:59:59.000Z

218

The Nearby Supernova Factory Ozone + Aerosol + Rayleigh  

E-Print Network [OSTI]

Rayleigh + Aerosol Extinction monitor filter Auxiliary Camera CCD Spectrograph picko ff mirror Umbra

219

Molecular gas in nearby elliptical radio galaxies  

E-Print Network [OSTI]

Powerful radio-AGN are hosted by massive elliptical galaxies which are usually very poor in molecular gas. Nevertheless the central Black Hole (BH) needs molecular gas for the nuclear activity. Thus it is important to study the origin, the distribution and the kinematics of the molecular gas in such objects. We have performed at the IRAM-30m telescope a survey of the CO(1-0) and CO(2-1) emission in the most powerful radio galaxies of the Local Universe, selected only on the basis of their radio continuum fluxes. The main result of that survey is the low content in molecular gas of such galaxies compared to Seyfert galaxies. The median value of the molecular gas mass is 4x10^8 Msun. Moreover, the CO spectra indicate the presence of a central molecular gas disk in some of these radio galaxies. We complemented this survey with photometric data of SPITZER and IRAS fluxes with the purpose to study the dust and its relation with the molecular gas and AGN.

B. Ocana-Flaquer; S. Leon; J. Lim; F. Combes; Dinh-V-Trung

2008-03-31T23:59:59.000Z

220

Dynamics of the Disks of Nearby Galaxies  

E-Print Network [OSTI]

I describe how the dynamics of galactic disks can be inferred by imaging and spectroscopy. Next I demonstrate that the decomposition of the rotation curves of spiral galaxies into the contributions by the various components of the galaxies is highly degenerate. Constraints on the decomposition can be found by considering implications for the dynamics of the galactic disks. An important diagnostic is the Toomre Q stability parameter which controls the stability of a galactic disk against local Jeans collapse. I also show how the density wave theory of galactic spiral arms can be employed to constrain the mass of a galactic disk. Applying both diagnostics to the example of NGC 2985 and discussing also the implied mass-to-light ratio I demonstrate that the inner parts of the galaxy, where the optical disk resides, are dominated by baryons. When I apply this method to the disks of low surface brightness galaxies, I find unexpectedly high mass-to light ratios. These could be explained by population synthesis models which assume a bottom heavy initial mass function similar to the recently proposed `integrated galactic initial mass function'.

B. Fuchs

2008-10-20T23:59:59.000Z

Note: This page contains sample records for the topic "tall obstacles nearby" 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

GRB 130427A: A Nearby Ordinary Monster  

E-Print Network [OSTI]

,13 K. Wiersema,8 Y. Yatsu,5 T. Yoshii,5 G. Tagliaferri2 Long-duration gamma-ray bursts (GRBs at 95 GeV (2). It was detected with Fermi­Gamma-ray Burst Mon- itor (GBM) (3) at T0, GBM = 47:06.42 UTon and over the full range of GRB isotropic energies. G amma-ray burst (GRB) 130427Awas the brightest burst

Napp, Nils

222

A high resolution view of the jet termination shock in a hot spot of the nearby radio galaxy Pictor A: implications for X-ray models of radio galaxy hot spots  

E-Print Network [OSTI]

Images made with the VLBA have resolved the region in a nearby radio galaxy, Pictor A, where the relativistic jet that originates at the nucleus terminates in an interaction with the intergalactic medium, a so-called radio galaxy hot spot. This image provides the highest spatial resolution view of such an object to date (16 pc), more than three times better than previous VLBI observations of similar objects. The north-west Pictor A hot spot is resolved into a complex set of compact components, seen to coincide with the bright part of the hot spot imaged at arcsecond-scale resolution with the VLA. In addition to a comparison with VLA data, we compare our VLBA results with data from the HST and Chandra telescopes, as well as new Spitzer data. The presence of pc-scale components in the hot spot, identifying regions containing strong shocks in the fluid flow, leads us to explore the suggestion that they represent sites of synchrotron X-ray production, contributing to the integrated X-ray flux of the hot spot, along with X-rays from synchrotron self-Compton scattering. This scenario provides a natural explanation for the radio morphology of the hot spot and its integrated X-ray emission, leading to very different predictions for the higher energy X-ray spectrum compared to previous studies. From the sizes of the individual pc-scale components and their angular spread, we estimate that the jet width at the hot spot is in the range 70 - 700 pc, which is comparable to similar estimates in PKS 2153-69, 3C 205, and 4C 41.17. The lower limit in this range arises from the suggestion that the jet may dither in its direction as it passes through hot spot backflow material close to the jet termination point, creating a "dentist drill" effect on the inside of a cavity 700 pc in diameter.

S. J. Tingay; E. Lenc; G. Brunetti; M. Bondi

2008-10-02T23:59:59.000Z

223

UV-BRIGHT NEARBY EARLY-TYPE GALAXIES OBSERVED IN THE MID-INFRARED: EVIDENCE FOR A MULTI-STAGE FORMATION HISTORY BY WAY OF WISE AND GALEX IMAGING  

SciTech Connect (OSTI)

In the local universe, 10% of massive elliptical galaxies are observed to exhibit a peculiar property: a substantial excess of ultraviolet emission than what is expected from their old, red stellar populations. Several origins for this ultraviolet excess (UVX) have been proposed including a population of hot young stars and a population of old, blue horizontal branch or extended horizontal branch (BHB or EHB) stars that have undergone substantial mass loss from their outer atmospheres. We explore the radial distribution of UVX in a selection of 49 nearby E/S0-type galaxies by measuring their extended photometry in the UV through mid-infrared (mid-IR) with the Galaxy Evolution Explorer (GALEX), the Sloan Digital Sky Survey, and the Wide-field Infrared Survey Explorer (WISE). We compare UV/optical and UV/mid-IR colors with the Flexible Stellar Population Synthesis models, which allow for the inclusion of EHB stars. We find that combined WISE mid-IR and GALEX UV colors are more effective in distinguishing models than optical colors, and that the UV/mid-IR combination is sensitive to the EHB fraction. There are strong color gradients, with the outer radii bluer than the inner half-light radii by {approx}1 mag. This color difference is easily accounted for with an increase in the BHB fraction of 0.25 with radius. We estimated that the average ages for the inner and outer radii are 7.0 {+-} 0.3 Gyr, and 6.2 {+-} 0.2 Gyr, respectively, with the implication that the outer regions are likely to have formed {approx}1 Gyr after the inner regions. Additionally, we find that metallicity gradients are likely not a significant factor in the color difference. The separation of color between the inner and outer regions, which agrees with a specific stellar population difference (e.g., higher EHB populations), and the {approx}0.5-2 Gyr age difference suggests multi-stage formation. Our results are best explained by inside-out formation: rapid star formation within the core at early epochs (>4 Gyr ago) and at least one later stage starburst event coinciding with z {approx} 1.

Petty, S. M.; Farrah, D. G. [Department of Physics, Virginia Tech, Blacksburg, VA 24061 (United States); Neill, J. D.; Bridge, C. R. [Division of Physics, Math, and Astronomy, California Institute of Technology, Pasadena, CA 91125 (United States); Jarrett, T. H.; Tsai, C.-W. [Astronomy Department, University of Cape Town, Rondebosch 7701 (South Africa); Blain, A. W. [Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH (United Kingdom); Rich, R. M.; Lake, S. E.; Wright, E. L. [Department of Physics and Astronomy, University of California, Los Angeles, CA 90095 (United States); Benford, D. J. [NASA, Goddard Space Flight Center, Greenbelt, MD 20771 (United States); Masci, F. J. [IPAC, California Institute of Technology, Pasadena, CA 91125 (United States)

2013-10-01T23:59:59.000Z

224

Efficient Obstacle-Avoiding Rectilinear Steiner Tree Construction  

E-Print Network [OSTI]

Taiwan University, Taipei 106, Taiwan enorm@eda.ee.ntu.edu.tw, ywchang@cc.ee.ntu.edu.tw, yangc@csie.ntu an effective and efficient algorithm for the OARSMT problem to facilitate the IC design flow. Previous methods

Chang, Yao-Wen

225

BPA and partners surmount unique obstacles on Grand Coulee project  

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

Articles (by tag) Lineman shares life-saving skills with electrical workers in Suriname Thursday, January 08, 2015 NWPPA spotlights synchrophasors, energy-saving competition...

226

THE TWO-PHASE FRACTIONAL OBSTACLE PROBLEM 1 ...  

E-Print Network [OSTI]

development of new tools such as the Caffarelli-Silvestre extension, .... preliminary results on our problem: energy inequality, local boundedness, Weiss-

2014-06-26T23:59:59.000Z

227

Overcoming the obstacles: life stories of scientists with learning disabilities  

E-Print Network [OSTI]

Teens.................................................................................... 97 Careers Based on Strengths...................................................................................... 98 Developed Coping Techniques...: ?No otherwise qualified handicapped individual in the United States?shall, solely by reason of his handicap, be excluded from the participation in, be denied the benefits of, or be subjected to discrimination under any program or activity receiving...

Force, Crista Marie

2009-05-15T23:59:59.000Z

228

Overcoming mixed waste management obstacles - A company wide approach  

SciTech Connect (OSTI)

The dual regulation of mixed waste by the Nuclear Regulatory Commission and the Environmental Protection Agency has significantly complicated the treatment, storage and disposal of this waste. Because of the limited treatment and disposal options available, facilities generating mixed waste are also being forced to acquire storage permits to meet requirements associated with the Resource Conservation and Recovery Act. Due to the burdens imposed by the regulatory climate, Entergy Operations has undertaken a proactive approach to managing its mixed waste. Their approach is company wide and simplistic in nature. Utilizing the peer groups to develop strategies and a company wide procedure for guidance on mixed waste activities, they have focused on areas where they have the most control and can achieve the greatest benefits from their efforts. A key aspect of the program includes training and employee awareness regarding mixed waste minimization practices. In addition, Entergy Operations is optimizing the implementation of regulatory provisions that facilitate more flexible management practices for mixed waste. This presentation focuses on the team approach to developing mixed waste managements programs and the utilization of innovative thinking and planning to minimize the regulatory burdens. It will also describe management practices and philosophies that have provided more flexibility in implementing a safe and effective company wide mixed waste management program.

Buckley, R.N. [Entergy Operations, Inc., Jackson, MS (United States)

1996-10-01T23:59:59.000Z

229

Obstacles to Determining Punitive Damages in Class Actions  

E-Print Network [OSTI]

Courts and commentators have often embraced the class action device as an ideal means of assessing punitive damages fairly in mass tort cases. In this Article, Professor Hines sounds a cautionary note by identifying a number of procedural...

Hines, Laura J.

2001-01-01T23:59:59.000Z

230

NREL Overcomes Obstacles in Lignin Valorization (Fact Sheet)  

SciTech Connect (OSTI)

This NREL Highlight is being produced for the 2015 February Alliance S&T Board meeting, and describes research that shows lignin can be converted into renewable fuels, chemicals, and materials.

Not Available

2015-01-01T23:59:59.000Z

231

NREL: News - New Process Helps Overcome Obstacles to Produce...  

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

conceptual approach we demonstrate can be applied to many different types of biomass feedstocks and combined with many different strategies for breaking down lignin,...

232

Obstacles and Opportunity: Turbine Motorization in Refineries Today  

E-Print Network [OSTI]

Steam turbines have been widely used in oil refineries for driving pumps, compressors and other rotary machines. However, in recent years, the authors of this paper have seen substantial turbine motorization projects completed or being planned...

Feng, Hua; Liu, Jinghing; Liu, Xiang; Ahmad, Mushtaq; Deng, Alan

2012-01-01T23:59:59.000Z

233

Obstacles and Opportunity: Overcoming Barriers in Today's CHP Marketplace  

E-Print Network [OSTI]

Combined heat and power (CHP), which can offer tremendous efficiency benefits to industrial facilities around the country, continues to be viewed as a long-term efficiency opportunity. However, the high up-front cost of CHP equipment and fuel...

Chittum, A.; Kaufman, N.

2011-01-01T23:59:59.000Z

234

Reverse Time Migration for Extended Obstacles: Electromagnetic Waves  

E-Print Network [OSTI]

We propose a new single frequency reverse time migration (RTM) algorithm for imaging extended targets using electromagnetic waves. The imaging functional is defined as the imaginary part of the cross-correlation of the Green function for Helmholtz equation and the back-propagated electromagnetic field. The resolution of our RTM method for both penetrable and non-penetrable extended targets is studied by virtue of Helmholtz-Kirchhoff identity for the time-harmonic Maxwell equation. The analysis implies that our imaging functional is always positive and thus may have better stability properties. Numerical examples are provided to demonstrate the powerful imaging quality and confirm our theoretical results.

Junqing Chen; Zhiming Chen; Guanghui Huang

2014-06-10T23:59:59.000Z

235

ON THE GLOBAL SOLUTIONS OF THE PARABOLIC OBSTACLE PROBLEM  

E-Print Network [OSTI]

analysis is essential in studying the local properties of a free boundary. The idea to use information investigation in [CPS]. Notations and de#12;nitions. Throughout the paper we will use the following notations: z

Shahgholian, Henrik

236

Microsoft Word - THE EFFECT OF OBSTACLE#4781.doc  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia: Energy Resources Jump to:46 -Energieprojekte GmbH Jump to:Michigan: EnergyChina Final Report for aofNepalTHE

237

Native American Housing: Obstacles and Opportunities | Department of Energy  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE: AlternativeEnvironment, SafetyWaterMary LandrieuNEETEnergy NationalBusinesses |Native American

238

Opportunities and obstacles for foreign investors in Turkish real estate  

E-Print Network [OSTI]

This paper examines the Turkish real estate market from the viewpoint of foreign investors contemplating entering into that market. Since 2002, the government of Turkey has been implementing an aggressive economic reform ...

Halkali, Hasan

2006-01-01T23:59:59.000Z

239

6,000 Feet Long (over one mile) 550 Feet Tall  

E-Print Network [OSTI]

Kurdistan Worker's Party (PKK)Kurdistan Worker's Party (PKK) inin Turkey.Turkey. Turkish Govt. claims PKK

Prevedouros, Panos D.

240

Seismic Intensity Estimation of Tall Buildings in Earthquake Early Warning System  

E-Print Network [OSTI]

systematic (e.g., basin motions vs. rock motions). Current state-of-the-art in seismology provides realistic the source location and the user's location. The Green's functions are pre-calculated for different source

Greer, Julia R.

Note: This page contains sample records for the topic "tall obstacles nearby" 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

Strategies for mitigating wind-induced motion in tall buildings through aerodynamic and damping modifications  

E-Print Network [OSTI]

The advent of modern structural systems, spurred by advances in construction methodology and high strength materials, has driven the height of modern skyscrapers beyond what was once deemed possible. Although science and ...

Nnamani, Nnabuihe

2012-01-01T23:59:59.000Z

242

Wind shear for large wind turbine generators at selected tall tower sites  

SciTech Connect (OSTI)

The objective of the study described in this report is to examine the nature of wind shear profiles and their variability over the height of large horizontal-axis wind turbines and to provide information on wind shear relevant to the design and opertion of large wind turbines. Wind turbine fatigue life and power quality are related through the forcing functions on the blade to the shapes of the wind shear profiles and their fluctuations over the disk of rotation.

Elliott, D.L.

1984-04-01T23:59:59.000Z

243

Chemical characterization of acidic components in a commercial depitching of crude tall oil  

E-Print Network [OSTI]

of Constituents in CTO Saps: 30m SP-2330 Glass Capillary Column. FRN: 21790 . VII. Assignment of Constituents in TOD Saps: 30m SP-2330 Glass Capillary Column. FRN: 21628 . VIII. Assignment of Constituents in CTO Saps: 25m DB-5 Fused Silica Capillary Column.... FRN: ZI637 IX. Assignment of Constituents in TOD Saps: 25m DB-5 Fused Silica Capillary Column. FRN: 21705 X. Assignment of Constituents in TOP Saps: 25m DB-5 Fused Silica Capillary Column. FRN: 21638 XI. List of Chromatograms XII. Response...

Tsurumi, Toshio

2012-06-07T23:59:59.000Z

244

Jointly organised by Centre for Asian Tall Buildings and Urban Habitat  

E-Print Network [OSTI]

for Infrastructure and Construction Industry Development THE UNIVERSITY OF HONG KONG Sustainable Building Design on climate change, the depletion of the earth's resources, widespread pollution, the concept of sustainable a building in operation down to the kinds of building materials used in its construction with emphasis

Tam, Vincent W. L.

245

Restoring Tallgrass Prairie and Grassland Bird Populations in Tall Fescue Pastures With Winter Grazing  

E-Print Network [OSTI]

­6% de la biomasa ae´rea total en potreros pastoreados todo el an~o, del 1­34% en los potreros pastoreados en el invierno, y de 31­34% en el remanente de la vegetacio´n nativa. La abundancia y biomasa de

Sandercock, Brett K.

246

QR Factorization of Tall and Skinny Matrices in a Grid Computing Environment  

E-Print Network [OSTI]

infrastructures have successfully exploited the emerging hard- ware technologies. The Folding@Home project [7

Boyer, Edmond

247

LAPACK Working Note #224 QR Factorization of Tall and Skinny Matrices in a  

E-Print Network [OSTI]

have successfully exploited the emerging hardware technologies. The Folding@Home project [7] ­ which

Dongarra, Jack

248

Limits to recruitment of tall fescue plants in poplar silvopastoral systems of the Pampas, Argentina  

E-Print Network [OSTI]

, Argentina M. P. Clavijo · P. S. Cornaglia · P. E. Gundel · M. Nordenstahl · E. G. Jobbagy Received: 28 grasslands, Argentina (Wright et al. 2000). Silvopastoral systems that combine cattle production and forestry, Argentina e-mail: mclavijo@agro.uba.ar P. E. Gundel Ca´tedra de Ecologi´a-IFEVA (CONICET), Facultad de

Nacional de San Luis, Universidad

249

Sensitivity of the Earthquake Response of Tall Steel Moment Frame Buildings to Ground Motion Features  

E-Print Network [OSTI]

the skyline of many cities in the western US exposed to serious seismicity from a variety of sources. Consider with a simple energy balance analysis. The collapse initiation regime expands to lower ground motion periods are the ground motion features that could collapse these massive structures. Real-world data that could provide

Krishnan, Swaminathan

250

A systems approach to conceptual design solutions for a very tall building in Hong Kong  

E-Print Network [OSTI]

The thesis represents a design investigation that seeks to reconsider the high-rise building. With changing uses and technologies, high-rise office towers may have become obsolete. Given the recent capabilities for ...

Ungerer, Frank Wolfgang, 1969-

1998-01-01T23:59:59.000Z

251

Effects of a tuned mass damper on wind-induced motions in tall buildings  

E-Print Network [OSTI]

With ever increasing constructability capacities, engineers have found solutions to build taller and taller structures. However, the race for the sky has not only brought up new ways of building, it has also created new ...

Carlot, Julien (Julien Alexandre Laurent)

2012-01-01T23:59:59.000Z

252

Mechanism of Collapse of Tall Steel Moment Frame Buildings Under Earthquake Excitation  

E-Print Network [OSTI]

, seventeenth, and penthouse stories. The lateral force-resisting system consists of two- bay welded steel these questions through computational case-history studies of two 18-story steel moment frame buildings and their variants. The first building is an existing 18-story office building, located within five miles

Krishnan, Swaminathan

253

Building optimization : an integrated approach to the design of tall buildings  

E-Print Network [OSTI]

There has been much research done on building optimization that deal with the issues within specific individual fields, such as architecture, structural engineering, and construction engineering. However, in practical ...

Coleman, Keith LaMar

2007-01-01T23:59:59.000Z

254

Analysis of thermal fields generated by natural fires on the structural elements of tall buildings   

E-Print Network [OSTI]

The Windsor Tower in Madrid was involved in a major fire, on 12-13 February 2005, which caused extensive structural damage to the upper floors of the building. This fire has provoked intense interest amongst researchers ...

Capote, Jorge A; Alvear, Daniel; Lazaro, Mariano; Espina, Pablo; Fletcher, Ian A; Welch, Stephen; Torero, Jose L

255

Acclimatization of soil respiration to warming in a tall grass prairie  

E-Print Network [OSTI]

to climatic warming2±4 . The feedback mechanism is usually based on the assumption that observed sensitivity feedbacks into the climatic system. Climatic warming, on one hand, potentially stimulates nutrient) since 21 November 1999 to study respiratory sensitivity to climate change. We also used clipping

256

Tall concrete buildings subject to vertically moving fires: A case study approach   

E-Print Network [OSTI]

regarded as safe in a fire situation as concrete is non-flammable and exhibits highly insulating material properties. The majority of current research relating to the impact of fire on structures examines other forms of construction. Research of concrete...

Fletcher, Ian A

257

Cerro Prieto cold water injection: effects on nearby production wells  

E-Print Network [OSTI]

CFE-DOE Symp. in Geothermal Energy, DOE CONF 8904129, pp.Proc. CFE-DOE Symp. in Geothermal Energy, DOE CONF 8904129,

Truesdell, A.H.

2010-01-01T23:59:59.000Z

258

Studies of nearby poor clusters - A3574 and S753  

SciTech Connect (OSTI)

Photometric and spectroscopic data are presented for two clusters, A3574 and S753, belonging to the Centaurus concentration of galaxies. The masses of the clusters are estimated at 1.5 x 10 to the 14th solar masses; no evidence of substructure has been detected in either cluster. The solution of a two-body linear orbit suggests that the clusters do not form a bound system, although the result is marginal. 60 refs.

Willmer, C.N.A.; Focardi, P.; Chan, R.; Pellegrini, P.S.; Da Costa, N.L. (Observatorio Nacional do Brasil, Rio de Janeiro (Brazil))

1991-01-01T23:59:59.000Z

259

The Photometric Properties of Nearby Type Ia Supernovae  

E-Print Network [OSTI]

1.1.1 Thermonuclear SNe . . . . . . 1.1.2 Core-Collapseby which they explode: thermonuclear and core collapse.thesis is focused on thermonuclear SNe, I describe the two

Ganeshalingam, Mohan

2012-01-01T23:59:59.000Z

260

Cerro Prieto cold water injection: effects on nearby production wells  

E-Print Network [OSTI]

CFE-DOE Symp. in Geothermal Energy, DOE CONF 8904129, pp.Proc. CFE-DOE Symp. in Geothermal Energy, DOE CONF 8904129,and Renewable Energy, Office of Geothermal Technologies, of

Truesdell, A.H.

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "tall obstacles nearby" 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

Infrared Properties of Nearby Interacting Galaxies: from Spirals to ULIRGs  

E-Print Network [OSTI]

I present a brief review of some of the mid-infrared properties of interacting galaxies as these were revealed using observations from the Infrared Space Observatory and Spitzer Space Telescope over the last decade. The variation of the infrared spectral energy distribution in interacting galaxies can be used as an extinction free tracer not only of the location of the star formation activity but also of the physical mechanism dominating their energy production.

V. Charmandaris

2006-10-20T23:59:59.000Z

262

Fusion of calcium isotopes and of nearby systems  

SciTech Connect (OSTI)

Very recent data on {sup 40,48}Ca+{sup 40,48}Ca are presented. In all cases fusion hindrance far below the barrier has been observed. Coupled-channel effects influence the threshold energy for hindrance. The excitation functions of the two symmetric systems are similar, while the case of {sup 40}Ca+{sup 48}Ca is different both above and below the barrier, possibly due to couplings to transfer channels with Q > 0. Other systems in the same mass region show different trends that have to be related to the nuclear structure of the colliding nuclei. Investigating the behavior of lighter systems will be interesting also from the astrophysical point of view.

Stefanini, A. M. [INFN, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Padova (Italy)

2012-10-20T23:59:59.000Z

263

THE NEARBY, YOUNG, ISOLATED, DUSTY STAR HD 166191  

SciTech Connect (OSTI)

We report an in-depth study of the F8-type star HD 166191, identified in an ongoing survey for stars exhibiting infrared emission above their expected photospheres in the Wide-field Infrared Survey Explorer all-sky catalog. The fractional IR luminosity measured from 3.5 to 70 ?m is exceptionally high (L{sub IR}/L{sub bol} ? 10%). Near-diffraction-limited imaging observations with the T-ReCS Si filter set on the Gemini South telescope and adaptive optics imaging with the NIRC2 Lp filter on the Keck II telescope confirmed that the excess emission coincides with the star. Si-band images show a strong solid-state emission feature at ?10 ?m. Theoretical evolutionary isochrones and optical spectroscopic observations indicate a stellar age in the range 10-100 Myr. The large dust mass seen in HD 166191's terrestrial planet zone is indicative of a recent collision between planetary embryos or massive ongoing collisional grinding associated with planet building.

Schneider, Adam; Song, Inseok; Hufford, Tara [Department of Physics and Astronomy, University of Georgia, Athens, GA 30602 (United States); Melis, Carl [Center for Astrophysics and Space Sciences, University of California, San Diego, CA 92093 (United States); Zuckerman, B. [Department of Physics and Astronomy, University of California, Los Angeles, CA 90095 (United States); Bessell, Mike [Research School of Astronomy and Astrophysics, The Australian National University, Weston Creek, ACT 2611 (Australia); Hinkley, Sasha, E-mail: aschneid@physast.uga.edu, E-mail: song@physast.uga.edu, E-mail: tara@physast.uga.edu, E-mail: cmelis@ucsd.edu, E-mail: ben@astro.ucla.edu, E-mail: bessell@mso.anu.edu.au, E-mail: shinkley@astro.caltech.edu [Department of Astronomy, California Institute of Technology, Pasadena, CA 91125 (United States)

2013-11-01T23:59:59.000Z

264

GALAXY GROWTH BY MERGING IN THE NEARBY UNIVERSE  

SciTech Connect (OSTI)

We measure the mass growth rate by merging for a wide range of galaxy types. We present the small-scale (0.014 h {sup -1} {sub 70} Mpc < r < 11 h {sub 70} {sup -1} Mpc) projected cross-correlation functions w(r {sub p}) of galaxy subsamples from the spectroscopic sample of the NYU Value-Added Galaxy Catalog (5 Multiplication-Sign 10{sup 5} galaxies of redshifts 0.03 < z < 0.15) with galaxy subsamples from the Sloan Digital Sky Survey imaging (4 Multiplication-Sign 10{sup 7} galaxies). We use smooth fits to de-project the two-dimensional functions w(r {sub p}) to obtain smooth three-dimensional real-space cross-correlation functions {xi}(r) for each of several spectroscopic subsamples with each of several imaging subsamples. Because close pairs are expected to merge, the three-space functions and dynamical evolution time estimates provide galaxy accretion rates. We find that the accretion onto massive blue galaxies and onto red galaxies is dominated by red companions, and that onto small-mass blue galaxies, red and blue galaxies make comparable contributions. We integrate over all types of companions and find that at fixed stellar mass, the total fractional accretion rates onto red galaxies ({approx}3 h {sub 70} percent per Gyr) are greater than that onto blue galaxies ({approx}1 h {sub 70} percent per Gyr). These rates are almost certainly overestimates because we have assumed that all close pairs merge as quickly as the merger time that we used. One conclusion of this work is that if the total growth of red galaxies from z = 1 to z = 0 is mainly due to merging, the merger rates must have been higher in the past.

Jiang Tao; Hogg, David W.; Blanton, Michael R., E-mail: david.hogg@nyu.edu [Center for Cosmology and Particle Physics, Department of Physics, New York University, 4 Washington Place, New York, NY 10003 (United States)

2012-11-10T23:59:59.000Z

265

Manipulating Josephson junctions in thin-films by nearby vortices  

SciTech Connect (OSTI)

It is shown that a vortex trapped in one of the banks of a planar edge-type Josephson junction in a narrow thin-film superconducting strip can change drastically the dependence of the junction critical current on the applied field, I-c(H). When the vortex is placed at certain discrete positions in the strip middle, the pattern I-c(H) has zero at H = 0 instead of the traditional maximum of '0-type' junctions. The number of these positions is equal to the number of vortices trapped at the same location. When the junction-vortex separation exceeds similar to W, the strip width, I-c(H) is no longer sensitive to the vortex presence. The same is true for any separation if the vortex approaches the strip edges. (C) 2014 Elsevier B.V. All rights reserved.

Kogan, V.G.; Mints, R.G.

2014-07-01T23:59:59.000Z

266

GALEX UV Color Relations for Nearby Early-Type Galaxies  

E-Print Network [OSTI]

We use GALEX/optical photometry to construct color-color relationships for early-type galaxies sorted by morphological type. We have matched objects in the GALEX GR1 public release and the first IR1.1 internal release, with the RC3 early-type galaxies having a morphological type -5.5

Jose Donas; Jean-Michel Deharveng; R. Michael Rich; Sukyoung K. Yi; Young-Wook Lee; Alessandro Boselli; Armando Gil de Paz; Samuel Boissier; Stephane Charlot; Samir Salim; Luciana Bianchi; Tom A. Barlow; Karl Forster; Peter G. Friedman; Timothy M. Heckman; Barry F. Madore; D. Christopher Martin; Bruno Milliard; Patrick Morrissey; Susan G. Neff; David Schiminovich; Mark Seibert; Todd Small; Alex S. Szalay; Barry Y. Welsh; Ted K. Wyder

2006-08-29T23:59:59.000Z

267

RR Lyrae Variables in Globular Clusters and Nearby Galaxies  

E-Print Network [OSTI]

I point out that the Oosterhoff dichotomy for globular cluster and field RR Lyrae (RRL) stars may place the strongest constraints so far on the number of dwarf spheroidal-like protogalactic fragments that may have contributed to the formation of the Galactic halo. The first calibration of the RRL period-luminosity relation in I, J, H, K taking evolutionary effects into account is provided. Problems in the interpretation of RRL light curves and evolutionary properties are briefly reviewed.

M. Catelan

2004-05-01T23:59:59.000Z

268

Collection: Supernova Discoveries from the Nearby Supernova Factory  

Office of Scientific and Technical Information (OSTI)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "ofEarlyEnergyDepartmentNationalRestart ofMeasuring DopamineEnergy,6. Radiative

269

Selection of structural systems and materials: minimizing lateral drift and cost of tall buildings in Saudi Arabia.  

E-Print Network [OSTI]

??This thesis proposes procedures and guidelines for selection of optimum structural systems and materials in two stages. Stage one is based on a list of… (more)

ALShamrani, Othman Subhi

2007-01-01T23:59:59.000Z

270

Use of Computer Simulation to Reduce the Energy Consumption in a Tall Office Building in Dubai-UAE  

E-Print Network [OSTI]

of interest to the outdoor horizontal illuminance under a standard uniform sky developed by the overcast Commission International de l'Eclairage (CIE) (Reinhart, 2006). Daylight factor enjoys considerable popularity since it is a quantity which can...

Abu-Hijleh, B.; Abu-Dakka, M.

2010-01-01T23:59:59.000Z

271

Reply to comment by Finnigan on ``On micrometeorological observations of surface-air exchange over tall vegetation''  

E-Print Network [OSTI]

hills (Raupach et al., 1992) to illustrate how the concentration ®eld might respond to ¯ow conver- gence within the lowest portion of the 2D Agricultural and Forest Meteorology 97 (1999) 65±67 * Tel.: +1

Lee, Xuhui

272

The effects of seeding rate, row spacing and rates of fertilizer on a short Vs a tall wheat variety  

E-Print Network [OSTI]

per square foot 20 Analysis of variance 8 square feet for winter forage, grams per 21 Analysis of variance square foot for number of heads per 23 Analysis of variance for number of seeds per he ad 24 Analysis of variance for 100-seed weight... of plants per square foot 41 Average dry weight of winter forage in grams per 8 square foot 42 3. Average number of heads per square foot 4. Average number of seeds per head 5. Average weight of 100 seed in grams 6 Average yield of grain in bushels per...

Rao, Srinivas Chamkurgopal

1968-01-01T23:59:59.000Z

273

Forty-Six-Foot Tall Needle Sculpture Rises Over Arts Quad > EMC2 News > The  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsruc DocumentationP-SeriesFlickr Flickr Editor's note: SincePlant Name: News 2008 Forthcoming

274

Field descriptions for a developing laminar tube flow with and without a concentrically located spherical obstacle  

E-Print Network [OSTI]

By Br" r Br" By (6) B'w 1 Bw Bgw Bn . Bw . Bw += ?. += ? . = Re (u ?. + w=) BrB r" Br By2 By r Br By (7) The nonlinear equations (6) and (7) are second order in the nondimensional radial and axial velocity, respectively, and require eight boundary... Approved as to style and content by: (C airman f Commit tee) (Co-Chairman of Committee) A Q' (Head of Dep rtment) P -, qg/, . 7 (Member) (M er) /7 Z~t j&dgc- December 1972 ABSTRACT Field Descriptions for a Developing Laminar Tube Flow...

Mikkelsen, Clark Douglas

2012-06-07T23:59:59.000Z

275

L'valuation des comptences relationnelles et sociales : obstacles idologiques et reconceptualisations ncessaires.  

E-Print Network [OSTI]

reconceptualisations nécessaires. Odile Camus ­ MCF HDR en psychologie sociale - Laboratoire ICONES ­ Université de Rouen - 76821 Mont-Saint- Aignan Cedex odile.camus@remuements.net 02 35 14 71 14 Travail effectué dans lesquels la place de chacun dans le monde du travail se trouve légitimée (Camus 2003:125). Cet article se

Paris-Sud XI, Université de

276

The participation of women in Saudi Arabia's economy: Obstacles and prospects.  

E-Print Network [OSTI]

??Low female labour force participation has been one of the main characteristics of the Saudi labour market over the last fifty years. This study is… (more)

Al-Dehailan, Salman Saleh

2007-01-01T23:59:59.000Z

277

Removing Obstacles in Neuroscience Drug Discovery: The Future Path for Animal Models  

E-Print Network [OSTI]

to ensure that basic science knowledge gained from improved animal models with good predictive and construct patients as quickly as possible. Neuropsychopharmacology Reviews (2009) 34, 74­89; doi:10.1038/npp.2008

Kalueff, Allan V.

278

NEAR-FIELD IMAGING OF OBSTACLES Peijun Li and Yuliang Wang  

E-Print Network [OSTI]

It has led to emerging applications in modern science and technology, such as nanotechnology, biology, information storage, and surface chemistry. This paper.

2014-01-22T23:59:59.000Z

279

Airports and Bicycles: what are the obstacles and incentives for operators 1 to improve bicycle access?  

E-Print Network [OSTI]

43. South Coast Air Quality Management District. SCAQMDunder South Coast Air Quality Management District (SCAQMD)air quality requirements(8). BOS travel demand management

Orrick, Phyllis; Frick, Karen Trapenberg

2013-01-01T23:59:59.000Z

280

Elemental mixing systematics and SrNd isotope geochemistry of mlange formation: Obstacles to identification of  

E-Print Network [OSTI]

to identification of fluid sources to arc volcanics Robert L. King a,b,, Gray E. Bebout a,b , Takuya Moriguti b protoliths to form hybridized bulk compositions not typical of seafloor "input" lithologies. In general, all by the evolution of bulk composition within mélange zones are probably the most important control of solid, liquid

Bebout, Gray E.

Note: This page contains sample records for the topic "tall obstacles nearby" 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

Generation of dust projectiles passing over an obstacle in the plasma sheath  

SciTech Connect (OSTI)

Dust projectiles were produced in a radio-frequency plasma by increasing 6-fold the radio-frequency power put into the discharge. The initial static dust particles were observed to gain speed while moving away from the confining region and escaped from the inter-electrode space on a ballistic-like trajectory. Single-grain dynamics simulations indicated that the dust particles were accelerated by changes induced in the sheath electric field profile.

Ticos, Catalin M.; Stoica, Daniel S. [National Institute for Laser, Plasma and Radiation Physics, 077125 Bucharest (Romania); Delzanno, Gian Luca [Los Alamos National Laboratory, T-5 Applied Mathematics and Plasma Physics Group, Los Alamos, New Mexico 87545 (United States)

2012-08-15T23:59:59.000Z

282

Airports and Bicycles: what are the obstacles and incentives for operators 1 to improve bicycle access?  

E-Print Network [OSTI]

Seattle Bicycle Master Plan. 2007. 54. King County.King County Commuter Trip Reduction Program. CommuteFrick SEA takes part in the King County State Commuter Trip

Orrick, Phyllis; Frick, Karen Trapenberg

2013-01-01T23:59:59.000Z

283

The Effect of a Group of Obstacles on a Flow and Dispersion over a Surface  

E-Print Network [OSTI]

OTest air can have a cathaTtic effect on the otheTwise polluted enviTonment of a built-up area neaTby. Such effects have been consideTed by Gross (1987, 1988) in investigations of the consequences of defOTestation. 1.2.2 Modelling pollution dispersion... canopies 9 1.2.2 Modelling pollution dispersion within urban areas 10 1.3 Previous work on plant and urban canopies 11 1.4 Aims of this thesis 14 1.5 Definition of the model problem. 16 2 Inviscid and laminar flow through a distributed force 21 2...

Jerram, Neil

1996-06-18T23:59:59.000Z

284

Airports and Bicycles: what are the obstacles and incentives for operators 1 to improve bicycle access?  

E-Print Network [OSTI]

leading to the airport. The MBTA is testing a policy thatTransportation Authority (MBTA) T trains, buses and ferry.

Orrick, Phyllis; Frick, Karen Trapenberg

2013-01-01T23:59:59.000Z

285

NEAR-FIELD IMAGING OF OBSTACLES Peijun Li and Yuliang Wang  

E-Print Network [OSTI]

lems have played a fundamental role in diverse scientific areas such as radar and sonar ... the measurement data is simulated by solving the direct problem by using a derived .... from the measured field u?(b, ?), where ? is the noise level.

2014-06-30T23:59:59.000Z

286

Calculation of unsteady turbulent flow around obstacles using the large eddy simulation turbulence model  

E-Print Network [OSTI]

The premise of the work presented here is to use a common analytical tool, Computational Fluid Dynamics (CFD), along with a prevalent turbulence model, Large Eddy Simulation (LES), to study the flow past rectangular cylinders. In an attempt to use...

Helton, Donald McLean

2002-01-01T23:59:59.000Z

287

Proposed roadmap for overcoming legal and financial obstacles to carbon capture and sequestration  

SciTech Connect (OSTI)

Many existing proposals either lack sufficient concreteness to make carbon capture and geological sequestration (CCGS) operational or fail to focus on a comprehensive, long term framework for its regulation, thus failing to account adequately for the urgency of the issue, the need to develop immediate experience with large scale demonstration projects, or the financial and other incentives required to launch early demonstration projects. We aim to help fill this void by proposing a roadmap to commercial deployment of CCGS in the United States.This roadmap focuses on the legal and financial incentives necessary for rapid demonstration of geological sequestration in the absence of national restrictions on CO2 emissions. It weaves together existing federal programs and financing opportunities into a set of recommendations for achieving commercial viability of geological sequestration.

Jacobs, Wendy (Harvard Environmental Law and Policy, Cambridge, MA (US)); Chohen, Leah; Kostakidis-Lianos, Leah; Rundell, Sara (Harvard Law School, Cambridge, MA (US))

2009-03-01T23:59:59.000Z

288

Sigma Hulls for Gaussian Belief Space Planning for Imprecise Articulated Robots amid Obstacles  

E-Print Network [OSTI]

-effective robots such as the Raven surgical robot [23], Baxter manufacturing robot [22], and low-cost manipulators [21]. These robots use inexpensive actuation methods such as cable-driven mechanisms and serial are with the Department of Electrical Engineering and Computer Sciences, University of California at Berkeley, CA, USA

North Carolina at Chapel Hill, University of

289

Biomass energy: State of the technology present obstacles and future potential  

SciTech Connect (OSTI)

The prevailing image of wood and waste burning as dirty and environmentally harmful is no longer valid. The use of biomass combustion for energy can solve many of our nation`s problems. Wood and other biomass residues that are now causing expensive disposal problems can be burned as cleanly and efficiently as natural gas, and at a fraction of the cost. New breakthroughs in integrated waste-to-energy systems, from fuel handling, combustion technology and control systems to heat transfer and power generation, have dramatically improved system costs, efficiencies, cleanliness of emissions, maintenance-free operation, and end-use applications. Increasing costs for fossil fuels and for waste disposal strict environmental regulations and changing political priorities have changed the economics and rules of the energy game. This report will describe the new rules, new playing fields and key players, in the hope that those who make our nation`s energy policy and those who play in the energy field will take biomass seriously and promote its use.

Dobson, L.

1993-06-23T23:59:59.000Z

290

Advancing TOD in Boston's suburbs : advantages and obstacles in the entitlement process  

E-Print Network [OSTI]

This thesis is an inquiry into the feasibility of creating new compact, mixed-use transit-oriented development (TOD) within existing suburbs. I have focused on the entitlement phase of projects, during which land is rezoned, ...

Simonson, Kristin (Kristin Andrea)

2011-01-01T23:59:59.000Z

291

The effects of obstacle geometry on jet mixing in releases of silane  

E-Print Network [OSTI]

Jet Author Jet/Surrounding pc/p, Slope 0. 0925* (p, /po) % error Becker Air/Air 1. 00 0. 0925 0. 0925 0. 0 Lockwood Corrsin Heated Air/Air 0. 54 Heated Air/Air 0. 5 0. 125 0. 133 0. 126 0. 131 0. 8 ? 1. 5 Pitts Schefer Keagy Dahm He.../Air CH4/Air CF4/Air SF6/Air C3Hs/Air N2/Air He/Air Water/Water 0. 14 0. 55 3. 01 5. 11 1. 53 0. 97 0. 14 1. 00 0. 281 0. 154 0. 055 0. 032 0. 075 0. 097 0. 286 0. 093 0. 250 0. 130 0. 053 0. 041 0. 075 0. 094 0. 250 0. 0925...

Sposato, Christina F

2000-01-01T23:59:59.000Z

292

Airports and Bicycles: what are the obstacles and incentives for operators 1 to improve bicycle access?  

E-Print Network [OSTI]

Airport f Boston International Airport g Minneapolis-St.Airport f Boston International Airport g Minneapolis-St.56. Boston Logan International Airport. Transportation

Orrick, Phyllis; Frick, Karen Trapenberg

2013-01-01T23:59:59.000Z

293

A realistic method for real-time obstacle avoidance without the Calculation of Cspace  

E-Print Network [OSTI]

extensively used for the inspection, maintenance and repair of offshore structures in both deep and shallow,45,46,30,31]. Such a real-time system normally consists of the following tasks: 1. dynamic plant identification; 2. low

294

Journal of Robotica 1 A realistic method for real-time obstacle  

E-Print Network [OSTI]

extensively used for the inspection, maintenance and repair of offshore structures in both deep and shallow,45,46,30,31]. Such a real-time system normally consists of the following tasks: 1. dynamic plant identification; 2. low

295

Dislocation climb strengthening in systems with immobile obstacles: Three-dimensional level-set simulation study  

E-Print Network [OSTI]

of High Performance Computing, Singapore, Singapore 5 Department of Materials Science and Engineering

Chu, Kevin T.

296

Obstacles in pursuing teacher certification of paraprofessional employees in a Texas urban school district  

E-Print Network [OSTI]

of Father?s Level Education/Mother?s Level of Education.. 69 xi LIST OF FIGURES FIGURE Page 1 Frequencies of Age of Participants Responding to Questionnaire with 85 of 90 Participants Responding...

Marz, Carrie Oden

2006-08-16T23:59:59.000Z

297

The Norwegian nuclear power debate revived? : an evaluation of thorium's opportunities and obstacles.  

E-Print Network [OSTI]

??Denne oppgaven ser på thoriums foreløpig uavklarte skjebne i Norge. Målene er å få frem koblinger til historie og omgivelser; kaste lys over kontroversen som… (more)

Hersoug, Elisabeth

2008-01-01T23:59:59.000Z

298

OBSTACLES, ACTIONS, AND OUTCOMES: LEARNING PROCESS APPROACH TO COMMUNITY MICRO HYDRO IN KALAHANDI, ORISSA.  

E-Print Network [OSTI]

?? Within the context of sustainable rural development and using action research methodology, the researcher identified and addressed challenges to implementing decentralized renewable energy applications… (more)

Vaghela, Dipti Mulrajsinh

2010-01-01T23:59:59.000Z

299

The parking policy and smart growth disconnect : obstacles to establishing and implementing smart growth parking policy  

E-Print Network [OSTI]

Urban areas are plagued by congestion, economic inequality, and inefficient land use that result from highway and single family housing subsidies, segregated land uses, and many other government policies established over ...

Richardson, Heather Eileen Seyfang

2005-01-01T23:59:59.000Z

300

This article highlights current economic conditions in China and analyzes existing obstacles to improving  

E-Print Network [OSTI]

, through the heart of China's Pearl River delta, past hillsides turned into gravel quarries, rice fields

Silver, Whendee

Note: This page contains sample records for the topic "tall obstacles nearby" 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

An Integrated Framework for Obstacle Mapping with See-Through Capabilities using Laser and Wireless  

E-Print Network [OSTI]

of the environment (the parts that can be sensed directly by the laser scanners) using occupancy grid mapping/object map can be a 2D (or 3D) grid map of the environment, where we have zeros at locations where, for instance, occupancy grid mapping approaches [1], [5] have been proposed to build a grid map

Liebling, Michael

302

Saving Energy in Industrial Compressed Air Systems: Issues and Obstacles in DSM Program Design  

E-Print Network [OSTI]

in capturing this potential through utility-sponsored DSM programs. Baltimore Gas & Electric Company (BG&E) has been investigating compressed air program design since 1991, and has offered rebate programs since January 1992. This paper will review BG... of performance, and incentive mechanisms. BACKGROUND Utility DSM for industrial customers has generally been developed as an offshoot of commercial programs targeting a few common end uses - lighting, HVAC, and motors. As DSM matures, however, utilities...

Trojanowski, D.; Parfomak, P.

303

Size based separation of submicron nonmagnetic particles through magnetophoresis in structured obstacle arrays  

E-Print Network [OSTI]

The focus of this work was on developing a novel scalable size based separation technology for nonmagnetic particles in the submicron size range utilizing magnetophoretic forces. When a nonmagnetic particle is immersed in ...

Annavarapu, V. N. Ravikanth (Venkata Nagandra Ravikanth)

2010-01-01T23:59:59.000Z

304

Brownfields redevelopment in rural Massachusetts : understanding the obstacles & identifying opportunities for success  

E-Print Network [OSTI]

Remediating and redeveloping contaminated properties represents a mounting national concern. Commonly referred to as brownfields, these contaminated and often vacant or underused, properties present significant environmental ...

Gallant, Darlene E. (Darlene Elizabeth), 1978-

2004-01-01T23:59:59.000Z

305

ANZIAM J. 0(2011), 130 Transcritical flow past an obstacle  

E-Print Network [OSTI]

] and [2]. For water waves and internal waves, typically stationary lee waves are found downstream for subcritical flow when c the linear supercritical and subcritical regimes respectively, while F(x) is a forcing term representing

306

First-Generation Risk Profiles Help Predict CO2 Storage Site Obstacles |  

Office of Environmental Management (EM)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "of Energy Power SystemsResourcesFLASH2011-11-OPAMFY 2007 TotalFinalJobs Findof Energy

307

Opportunities and obstacles for US investors in Moscow : office market comparative return study  

E-Print Network [OSTI]

Moscow in recent years has seen significant changes in the amount of investment grade office space. In the period before the financial crisis of 1998, in which Russia defaulted on its debt and the ruble was drastically ...

Stolyarik, Alexander V., 1974-

2003-01-01T23:59:59.000Z

308

A survey of David Lewis's theory of counterfactuals: resolved difficulties and resilient obstacles  

E-Print Network [OSTI]

of the comparative similarity relation by submitting a set of four weights or measures (i. e. , rules, guidelines, weights, or principles) according to which one may unpack and evaluate the similarity re]anon. Lewis's system of principles also attempts to explain... advanced by Bennett [1984]. In developing his account, Bennett attacks Lewis's system of weights and measures provided in 'Time's Arrow'. Bennett's alternative theory does not incorporate miracles, taking this feature to be s perk. Bennett also expresses...

Botham, Thad M

1999-01-01T23:59:59.000Z

309

A Search for Extraplanar Dust in Nearby Edge-On Spirals  

E-Print Network [OSTI]

We present high resolution BV images of 12 edge-on spiral galaxies observed with the WIYN 3.5-m telescope. These images were obtained to search for extraplanar (|z| > 0.4 kpc) absorbing dust structures similar to those previously found in NGC 891 (Howk & Savage 1997). Our imaged galaxies include a sample of seven massive L_*-like spiral galaxies within D 87 deg from the plane of the sky. We find that five of these seven systems show extraplanar dust, visible as highly-structured absorbing clouds against the background stellar light of the galaxies. The more prominent structures are estimated to have associated gas masses >10^5 M_sun; the implied potential energies are > 10^(52) ergs. All of the galaxies in our sample that show detectable halpha emission at large z also show extraplanar dust structures. None of those galaxies for which extraplanar halpha searches were negative show evidence for extensive high-z dust. The existence of extraplanar dust is a common property of massive spiral galaxies. We discuss several mechanisms for shaping the observed dust features, emphasizing the possibility that these dusty clouds represent the dense phase of a multiphase medium at high-z in spiral galaxies. The correlation between high-z dust and extraplanar Halpha emission may simply suggest that both trace the high-z interstellar medium in its various forms (or phases), the existence of which may ultimately be driven by vigorous star formation in the underlying disk. (Abstract abridged)

J. Christopher Howk; Blair D. Savage

1999-02-04T23:59:59.000Z

310

Extraplanar Dust and Star Formation in Nearby Edge-On Galaxies  

E-Print Network [OSTI]

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

J. Christopher Howk; Blair D. Savage

1998-10-27T23:59:59.000Z

311

X-ray observations of neutron stars and black holes in nearby  

E-Print Network [OSTI]

by the type of fuel left: hydrogen, helium, carbon etc #12;...and then the end ... but, after some time fluctuation ? · Intensity uncertainty : what is the real intensity (and its uncertainty) of my source given : Intensity as function of energy · Standard method : Fit spectra with models describing physical processes e

Wolfe, Patrick J.

312

A Resolved Molecular Gas Disk around the Nearby A Star 49 Ceti  

E-Print Network [OSTI]

The A star 49 Ceti, at a distance of 61 pc, is unusual in retaining a substantial quantity of molecular gas while exhibiting dust properties similar to those of a debris disk. We present resolved observations of the disk around 49 Ceti from the Submillimeter Array in the J=2-1 rotational transition of CO with a resolution of 1.0x1.2 arcsec. The observed emission reveals an extended rotating structure viewed approximately edge-on and clear of detectable CO emission out to a distance of ~90 AU from the star. No 1.3 millimeter continuum emission is detected at a 3-sigma sensitivity of 2.1 mJy/beam. Models of disk structure and chemistry indicate that the inner disk is devoid of molecular gas, while the outer gas disk between 40 and 200 AU from the star is dominated by photochemistry from stellar and interstellar radiation. We determine parameters for a model that reproduces the basic features of the spatially resolved CO J=2-1 emission, the spectral energy distribution, and the unresolved CO J=3-2 spectrum. We investigate variations in disk chemistry and observable properties for a range of structural parameters. 49 Ceti appears to be a rare example of a system in a late stage of transition between a gas-rich protoplanetary disk and a tenuous, virtually gas-free debris disk.

A. M. Hughes; D. J. Wilner; I. Kamp; M. R. Hogerheijde

2008-03-24T23:59:59.000Z

313

Characterization of a microwave frequency resonator via a nearby quantum dot  

E-Print Network [OSTI]

. Adeyeye* 1. Introduction Artificial ferromagnetic nanostructures with periodic lateral contrast at varied deposition angles and sub- sequent lift-off process. For a controlled experiment, Ni80Fe20

Wallraff, Andreas

314

Literature Review of Unconsolidated Sediment in San Francisco Bay and Nearby Pacific Ocean Coast  

E-Print Network [OSTI]

J. 2006. Under the Golden Gate Bridge – views of the sealocated beneath the Golden Gate Bridge. • The main north-of Golden Gate. The dashed line near Oakland is bridge

Keller, Barry R.

2009-01-01T23:59:59.000Z

315

The Magnificent Seven: Nearby Isolated Neutron Stars with strong Magnetic Fields  

E-Print Network [OSTI]

Although the true origin of the broad absorption lines in X-ray spectra of thermal isolated neutron stars is not clear yet, our current knowledge about the "magnificent seven" strongly suggests that they are highly magnetized ($10^{13} - 10^{14}$ G), slowly rotating cooling neutron stars. Further timing studies would be very useful to obtain more independent estimates of the magnetic field strength (as they currently only exist from RX J0720.4-3125).

F. Haberl

2005-10-17T23:59:59.000Z

316

Cosmic rays and the magnetic field of the nearby starburst galaxy NGC 253  

E-Print Network [OSTI]

Using radio polarimetry we study the connection between the transport of cosmic rays (CR's), the three-dimensional magnetic field structure, and features of other ISM phases in the halo of NGC 253. We present a new sensitive radio continuum map of NGC 253 obtained from combined VLA and Effelsberg observations at lambda 6.2 cm. We find a prominent radio halo with a scaleheight of the thick radio disk of 1.7 kpc. The linear dependence between the local scaleheight of the vertical continuum emission and the cosmic ray electron (CRE) lifetime requires a vertical CR bulk speed of 270 km s^-1. The magnetic field structure of NGC 253 resembles an ``X''-shaped configuration where the orientation of the large-scale magnetic field is plane-parallel only in the inner regions of the disk and at small distances from the galactic midplane. At larger galactocentric radii and further away from the midplane the vertical component becomes important. This is most clearly visible at the location of the ``radio spur'' southeast of the nucleus, where the magnetic field orientation is almost vertical. We made a simple model for the dominant toroidal (r,phi) magnetic field component using a spiral magnetic field with prescribed inclination and pitch angle. The residual poloidal (r,phi,z) magnetic field component which was revealed by subtracting the model from the observations shows a distinct ``X''-shaped magnetic field orientation centered on the nucleus. The orientation angle of the poloidal magnetic field is consistent with a magnetic field transport described by the superposition of the vertical CR bulk speed and the rotation velocity. Hence, we propose a disk wind which transports cosmic rays, magnetic field, and (partially) ionized gas from the disk into the halo.

V. Heesen; R. -J. Dettmar; M. Krause; R. Beck

2008-01-23T23:59:59.000Z

317

A 3D Search for Companions to 12 Nearby M-Dwarfs  

E-Print Network [OSTI]

We present a carefully vetted equatorial ($\\pm$ 30$^\\circ$ Decl.) sample of all known single (within 4'') mid M-dwarfs (M2.5V-M8.0V) extending out to 10 pc; their proximity and low masses make them ideal targets for planet searches. For this sample of 58 stars, we provide V$_J$, R$_{KC}$, I$_{KC}$ photometry, new low dispersion optical ($6000 - 9000$\\AA) spectra from which uniform spectral types are determined, multi-epoch H$\\alpha$ equivalent widths, and gravity sensitive $Na\\,I$ indices. For 12 of these 58 stars, strict limits are placed on the presence of stellar and sub-stellar companions, based on a pioneering program described here that utilizes precise infrared radial velocities and optical astrometric measurements in an effort to search for Jupiter-mass, brown dwarf and stellar-mass companions. Our infrared radial velocity precision using CSHELL at NASA's IRTF is $\\sim$90 m s$^{-1}$ over timescales from 13 days to 5 years. With our spectroscopic results the mean companion masses that we rule out of ex...

Davison, Cassy L; Henry, Todd J; Riedel, Adric R; Jao, Wei-Chun; Bailey, John I; Quinn, Samuel N; Cantrell, Justin R; Subasavage, John P; Winters, Jen G

2015-01-01T23:59:59.000Z

318

DISK EVOLUTION IN THE THREE NEARBY STAR-FORMING REGIONS OF TAURUS, CHAMAELEON, AND OPHIUCHUS  

SciTech Connect (OSTI)

We analyze samples of Spitzer Infrared Spectrograph spectra of T Tauri stars in the Ophiuchus, Taurus, and Chamaeleon I star-forming regions, whose median ages lie in the <1-2 Myr range. The median mid-infrared spectra of objects in these three regions are similar in shape, suggesting, on average, similar disk structures. When normalized to the same stellar luminosity, the medians follow each other closely, implying comparable mid-infrared excess emission from the circumstellar disks. We use the spectral index between 13 and 31 {mu}m and the equivalent width of the 10 {mu}m silicate emission feature to identify objects whose disk configuration departs from that of a continuous, optically thick accretion disk. Transitional disks, whose steep 13-31 {mu}m spectral slope and near-IR flux deficit reveal inner disk clearing, occur with about the same frequency of a few percent in all three regions. Objects with unusually large 10 {mu}m equivalent widths are more common (20%-30%); they could reveal the presence of disk gaps filled with optically thin dust. Based on their medians and fraction of evolved disks, T Tauri stars in Taurus and Chamaeleon I are very alike. Disk evolution sets in early, since already the youngest region, the Ophiuchus core (L1688), has more settled disks with larger grains. Our results indicate that protoplanetary disks show clear signs of dust evolution at an age of a few Myr, even as early as approx1 Myr, but age is not the only factor determining the degree of evolution during the first few million years of a disk's lifetime.

Furlan, E. [NASA Astrobiology Institute, and Department of Physics and Astronomy, UCLA, 430 Portola Plaza, Los Angeles, CA 90095 (United States); Watson, Dan M.; McClure, M. K., E-mail: Elise.Furlan@jpl.nasa.go, E-mail: dmw@pas.rochester.ed, E-mail: manoj@pas.rochester.ed [Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627 (United States)

2009-10-01T23:59:59.000Z

319

Cosmic rays and the magnetic field of the nearby starburst galaxy NGC 253  

E-Print Network [OSTI]

Using radio polarimetry we study the connection between the transport of cosmic rays (CR's), the three-dimensional magnetic field structure, and features of other ISM phases in the halo of NGC 253. We present a new sensitive radio continuum map of NGC 253 obtained from combined VLA and Effelsberg observations at lambda 6.2 cm. We find a prominent radio halo with a scaleheight of the thick radio disk of 1.7 kpc. The linear dependence between the local scaleheight of the vertical continuum emission and the cosmic ray electron (CRE) lifetime requires a vertical CR bulk speed of 270 km s^-1. The magnetic field structure of NGC 253 resembles an ``X''-shaped configuration where the orientation of the large-scale magnetic field is plane-parallel only in the inner regions of the disk and at small distances from the galactic midplane. At larger galactocentric radii and further away from the midplane the vertical component becomes important. This is most clearly visible at the location of the ``radio spur'' southeast o...

Heesen, V; Krause, M; Beck, R

2008-01-01T23:59:59.000Z

320

V405 Peg (RBS 1955): A Nearby, Low-Luminosity Cataclysmic Binary  

E-Print Network [OSTI]

(Abridged). The cataclysmic binary V405 Peg, originally discovered as ROSAT Bright Source (RBS) 1955 (= 1RXS J230949.6+213523), shows a strong contribution from a late-type secondary star in its optical spectrum, which led Schwope et al. to suggest it to be among the nearest cataclysmic binaries. We present extensive optical observations of V405 Peg. Time-series spectroscopy shows the orbital period, Porb, to be 0.1776469(7) d (= 4.2635 hr), or 5.629 cycle/d. We classify the secondary as M3 - M4.5. Astrometry with the MDM 2.4m telescope gives a parallax 7.2 +- 1.1 milli-arcsec, and a relative proper motion of 58 mas/yr. Our best estimate of the distance yields d = 149 (+26, -20) pc. The secondary stars's radial velocity has K2 = 92 +- 3 km/s, indicating a fairly low orbital inclination if the masses are typical. Extensive I-band time-series observations in the show the system varying between a minimum brightness level of I = 14.14 and states of enhanced activity about 0.2 mag brighter. While the low-state sho...

Thorstensen, J R; Schwope, A D; Staude, A; Vogel, J; Krumpe, M; Kohnert, J; Gomez-Moran, A Nebot

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "tall obstacles nearby" 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

III. High-Resolution Imaging of Nearby M dwarfs V. J. S. Bjar1,2  

E-Print Network [OSTI]

la Universidad de La Laguna, 3Centro de Astrobiología, 4Max-Planck-Institut für Astronomie · 5. Flux contribution and variations induced by companions at different separations. Red, blue and green

Complutense de Madrid, Universidad

322

Exploration of the environments of nearby stars with the NICMOS coronagraph instrumental performance considerations  

E-Print Network [OSTI]

pupil­plane mask (maintained at ~100K), with radial structures co­aligned with the HST secondary mirror. The coronagraph is comprised of two optical elements. The camera 2 field divider mirror, upon which the HST f/24. Keywords: Infrared, Coronagraphy, Hubble Space Telescope, Brown Dwarfs, Extra­Solar Planets 1. SCIENTIFIC

Schneider, Glenn

323

ALFALFA Discovery of the Nearby Gas-Rich Dwarf Galaxy Leo P. I. HI Observations  

E-Print Network [OSTI]

The discovery of a previously unknown 21cm HI line source identified as an ultra-compact high velocity cloud in the ALFALFA survey is reported. The HI detection is barely resolved by the Arecibo 305m telescope ~4' beam and has a narrow HI linewidth (HPFW of 24 km/s). Further HI observations at Arecibo and with the VLA corroborate the ALFALFA HI detection, provide an estimate of the HI radius, ~1' at the 5 x 10^19 cm^-2 isophote, and show the cloud to exhibit rotation with an amplitude of ~9.0 +/- 1.5 km/s. In other papers, Rhode et al. (2013) show the HI source to have a resolved stellar counterpart and ongoing star forming activity, while Skillman et al. (2013) reveal it as having extremely low metallicity: 12 + log(O/H) = 7.16 +/- 0.04. The HI mass to stellar mass ratio of the object is found to be 2.6. We use the Tully-Fisher template relation in its baryonic form (McGaugh 2012) to obtain a distance estimate D = 1.3 (+0.9,-0.5) Mpc. Additional constraints on the distance are also provided by the optical da...

Giovanelli, Riccardo; Adams, Elizabeth A K; Cannon, John M; Rhode, Katherine L; Salzer, John J; Skillman, Evan D; Bernstein-Cooper, Elijah Z; McQuinn, Kristen B W

2013-01-01T23:59:59.000Z

324

A Statistical Study of H I Gas in Nearby Narrow-Line AGN-Hosting Galaxies  

E-Print Network [OSTI]

As a quenching mechanism, AGN feedback could suppress on-going star formation in their host galaxies. On the basis of a sample of galaxies selected from ALFALFA HI survey, the dependence of their HI mass M[HI], stellar mass M[*] & HI-to-stellar mass ratio M[HI]/M[*] on various tracers of AGN activity are presented and analyzed in this paper. Almost all the AGN-hostings in this sample are gas-rich galaxies, and there is no any evidence to be shown to indicate that the AGN activity could increase/decrease either M[HI] or M[HI]/M[*]. The cold neutral gas can not be fixed positions accurately just based on available HI data due to the large beam size of ALFALFA survey. In addition, even though AGN-hostings are more easily detected by HI survey compared with absorption line galaxies, these two types of galaxies show similar star formation history. If an AGN-hosting would ultimately evolve into an old red galaxy with few cold gas, then when and how the gas has been exhausted have to be solved by future hypothes...

Zhu, Yi-Nan

2015-01-01T23:59:59.000Z

325

Nearby candidate dust-disk pre-main-sequence solar-mass stars  

E-Print Network [OSTI]

I have isolated a population of numerous F stars that appear to be pre-main-sequence (PMS). The candidate PMS stars have been identified using CM diagram, reddening, flux excess in the UV and near-infrared, and luminosity anomaly. Negative luminosity anomaly and excessive UV flux for many of these stars is suggestive of accretion disks, while the NIR excess is indicative in many cases of the presence of dust disk thermal emission. Observed overluminosity of many PMS candidates is consistent with their pre-main-sequence status. The bulk of the PMS candidates is located within 200 pc, exhibiting strong association with regions of star formation that are numerous between ~130 to 180 pc. The number of PMS candidates plummets redward of the spectral type ~ F5. This effect may provide important clues for understanding the evolution of PMS stars in the solar-mass range.

A. A. Suchkov

2002-10-25T23:59:59.000Z

326

The behavior of Radium-226 in the Mississippi River mixing zone and nearby waters  

E-Print Network [OSTI]

and illite clays in the suspended sediments have a cation-exchange capacity of 0. 54 meq/g. Other secondary and minor factors involved in the system were the high suspended sediment load (510 mg/L) and the physical dynamics (i. e. , discharge rate..., consisting mainly of fine sands, accounts for 10 X to 20X of the total sediment load. The suspended sediment load is made up of silt (40 X), clay (50 X) and very fine sands (5 ? 10 X). The suspended sediment load varies between 100 mg/L ? 500 mg/L, increas...

Moore, Daniel Garman

1986-01-01T23:59:59.000Z

327

Stellar and Intermediate-Mass Black Holes in the Milky Way and Nearby Galaxies  

SciTech Connect (OSTI)

With the advent of high resolution X-ray telescopes, the ability to identify extragalactic black holes has greatly enhanced our understanding of massive compact objects, as we are no longer limited to the rather meager Milky Way black hole population. The greatly increased numbers have opened up opportunities to find new modes of compact object accretion and potentially long-sought evidence for intermediate-mass black holes. In this lecture series, the current state of knowledge of stellar- and intermediate-mass black holes is reviewed, particularly in regards to black hole populations in external galaxies.

Irwin, Jimmy [Department of Physics and Astronomy, University of Alabama, Box 870324, Tuscaloosa, AL 35487-0324 (United States)

2010-08-09T23:59:59.000Z

328

Studies of Nearby Blazars with Milagro D. A. Williams for the Milagro Collaboration1  

E-Print Network [OSTI]

Milagro on new unidentified sources [2], gamma-ray bursts [3], galactic plane emission [4], and a search tubes (PMTs) to monitor the northern sky for astrophysical gamma-ray emission near 1 TeV. It is locatedV flaring behavior associated with AGN, even during daytime transits. The incident direction of gamma-ray

California at Santa Cruz, University of

329

On the CCD Calibration of Zwicky galaxy magnitudes & The Properties of Nearby Field Galaxies  

E-Print Network [OSTI]

We present CCD photometry for galaxies around 204 bright (m_Z = -0.35 \\pm 0.15 mag. The scatter around this fit is about 0.4 mag. Correcting the Zwicky magnitude system with the best fit model results in a 60% lower normalization and 0.35 mag brighter M_* in the luminosity function. This brings the CfA2 luminosity function closer to the other low redshift estimations (eg Stromlo-APM or LCRS). We find a significant positive angular correlation of magnitudes and position in the sky at scales smaller than about 5 armin, which corresponds to a mean separation of 120 Kpc/h. We also present colours, sizes and ellipticities for galaxies in our fields which provides a good local reference for the studies of galaxy evolution.

E. Gaztanaga; G. B. Dalton

1999-10-11T23:59:59.000Z

330

Literature Review of Unconsolidated Sediment in San Francisco Bay and Nearby Pacific Ocean Coast  

E-Print Network [OSTI]

2009 Literature Review of Unconsolidated Sediment in San2009. Literature review of unconsolidated sediment in Sanmay be difficult to locate. Unconsolidated sediment overlies

Keller, Barry R.

2009-01-01T23:59:59.000Z

331

Literature Review of Unconsolidated Sediment in San Francisco Bay and Nearby Pacific Ocean Coast  

E-Print Network [OSTI]

for construction of Treasure Island in the 1930s. Furtherin 1800. Locally, as at Treasure Island, parts of what was

Keller, Barry R.

2009-01-01T23:59:59.000Z

332

Automatic Selection of Nearby Web Servers USC TR 98-688  

E-Print Network [OSTI]

Advanced Re- search Projects Agency (DARPA) through FBI contract #J- FBI-95-185 entitled \\Large Scale

Heidemann, John

333

MONS on the Danish Roemer satellite: Measuring Oscillations in Nearby Stars  

E-Print Network [OSTI]

MONS is the scientific project on the Danish Roemer satellite mission, which is being developed as part of the Danish Small Satellite Programme. The principal goal is to study solar-like oscillations in around 20 bright stars, with a precision that in the best cases will be limited only by the intrinsic stellar `noise'. The baseline orbit, a so-called Molniya orbit, allows access to essentially the entire sky during the planned 2-year mission. The main instrument is a short-focus reflecting telescope with an aperture of 32 cm, making two-colour measurements. A focused Field Monitor will be used to detect and correct for possible faint variable stars of substantial amplitude near the main target. In addition the Field Monitor, and the Star Trackers on the platform, may be used to observe a broad range of variable phenomena. The project has concluded the Systems Definition Phase by a successful review, and launch is scheduled for the middle of 2005.

J. Christensen-Dalsgaard

2001-10-19T23:59:59.000Z

334

Performance of Surge Arrester to Multiple Lightning Strokes on Nearby Distribution Transformer  

E-Print Network [OSTI]

characteristics. Metal Oxide Varistor (MOVs) arresters for many years have proven to be more advantageous than

Omidiora M. A; Lehtonen M

335

Analysis of perturbed magnetic fields via construction of nearby integrable fields  

E-Print Network [OSTI]

. Dewar Dept. of Theoretical Physics & Plasma Research Laboratory, R.S.Phys.S.E., Australian National

Hudson, Stuart

336

SciTech Connect: High Statistics Study of Nearby Type 1a Supernovae. QUEST  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administrationcontroller systemsBi (2) Sr (2) Ca (2) Cu (3)Getting a grip onIllumination LEDCamera

337

Cosmological constraints from the virial mass function of nearby galaxy groups and clusters  

E-Print Network [OSTI]

In this thesis, I present a new determination of the cluster mass function in a volume ~107 h-03 70 Mpc3 using the ROSAT-2MASS-FAST Group Survey (R2FGS). R2FGS is an X-ray-selected sample of systems from the ROSAT All-Sky ...

Hill, James Colin

2008-01-01T23:59:59.000Z

338

Starburst, AGN and Out ow Activity in Near-by Seyfert Galaxies  

E-Print Network [OSTI]

et al. 1994) [c] occurs. From here the gas is postulated to be transported by a small scale dusty bar at the \\Millimetre Science With the Upgraded Australia Telescope" meeting at the University of Melbourne, 29

Curran, Steve

339

Sandia National Laboratories: how wind-turbine wakes interact with nearby  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1development Sandia,evaluatingfullhigher-performance spar cap Sandiabreakdown

340

Emissions of C6-C8 aromatic compounds in the United States: Constraints from tall tower1 and aircraft measurements2  

E-Print Network [OSTI]

6, 7 5 6 1. Department of Soil, Water, and Climate, University of Minnesota, St. Paul, MN, USA [Ahmadov et al.,18 2014; Jaars et al., 2014; Xue et al., 2014]. These aromatic VOCs (so-called BTEX

Mlllet, Dylan B.

Note: This page contains sample records for the topic "tall obstacles nearby" 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

Nitrogen, Aerosol Composition, and Halogens on a Tall Tower (NACHTT): Overview of a wintertime air chemistry field study in the front range urban corridor of Colorado  

E-Print Network [OSTI]

continuous vertical pro?ling and low surface wind speeds. [campaign. (b) Wind speed at 300 m. Vertical pro?ling was not

2013-01-01T23:59:59.000Z

342

Analysis of the obstacles to financing geothermal hydrothermal commercialization projects and the government programs designed to remove them  

SciTech Connect (OSTI)

The risks associated with geothermal hydrothermal commercialization are broken down into five categories: resource risk; technological risk; regulatory risk; investment parity risks; and institutional risk aversion. The impact of each risk upon geothermal financing is assessed. The federal government's programs to provide financial incentives for geothermal development are presented as follows: tax incentives; indirect financial incentives programs; direct grant/cost-sharing programs; and attempts at reducing regulatory risk through the enactment of legal and institutional reforms. (MHR)

Not Available

1981-03-20T23:59:59.000Z

343

Executive summary: legal obstacles and incentives to small-scale hydroelectric development in the six middle atlantic states  

SciTech Connect (OSTI)

The executive summary describes the relationship of Federal law and regulation to state law and regulation of small-scale hydroelectric facilities, highlighting important features of the constitutional, statutory, case law, and regulations of each of the six middle atlantic states (Maryland, Delaware, New York, New Jersey, Pennsylvania, and Virginia). Water law, direct and indirect regulation, and financial considerations for each state are presented. A flow diagram of regulation of small dams in each state is also included.

None,

1980-05-01T23:59:59.000Z

344

Using Section 111 of the Clean Air Act for Cap-and-Trade of Greenhouse Gas Emissions: Obstacles and Solutions  

E-Print Network [OSTI]

focused nitro- gen oxide emissions-trading program for largeNSPS program could use emissions trading, including cap-and-regulations that allow emissions trading, to achieve GHG

Enion, Rhead M.

2012-01-01T23:59:59.000Z

345

To appear in IEEE Trans. On CAD 1 Abstract--Partial shading is a serious obstacle to the effective  

E-Print Network [OSTI]

to an increasing appetite for energy sources and environmental concerns about fossil fuels, there has been a growing demand for renewable energy resources (e.g., solar, wind, geothermal), which are clean and eco-friendly. The energy produced from renewable energy resources must be cost-competitive with the energy produced from

Pedram, Massoud

346

Strategies Utilized while Minimizing Ankle Motion Bilaterally and Unilaterally during Level Ground Walking and Obstacle Clearance Tasks.  

E-Print Network [OSTI]

??A great deal of research has been done on the adaptive strategies of individuals who have been affected by a gait altering ailment, but there… (more)

Landy, Eoghan

2010-01-01T23:59:59.000Z

347

IIT Delhi launches SmartCaneTM to assist visually impaired to detect above-the-knee obstacles  

E-Print Network [OSTI]

manufacturer of medical devices for infant and maternity care is the industrial partner of Smart Delhi, March 30, 2014: The Indian Institute of Technology Delhi's Assistive Technologies Group-level. Utilising modern sensor technology, this device detects obstructions up to a distance of 3 metres

Banerjee, Subhashis

348

TRAILS, a Toolkit for Efficient, Realistic and Evolving Models of Mobility, Faults and Obstacles in Wireless Networks  

E-Print Network [OSTI]

This functionality is implemented in a simple and flexible architecture, that follows design patterns, object to function due to enviromental func- tions. Also, researchers make a lot of simplifying assump- tions

Zaroliagis, Christos D.

349

Experiments of trajectory generation and obstacle avoidance for a UGV David Vissi`ere, Dong Eui Chang, and Nicolas Petit  

E-Print Network [OSTI]

on a mobile robotic experiment developed at the DGA Laboratoire de Recherche en Balistique et A david.vissiere@dga.defense.gouv.fr D. E. Chang is Assistant Professor in the Department of Applied

350

NREL Overcomes Obstacles in Lignin Valorization (Fact Sheet), NREL Highlights in Research & Development, NREL (National Renewable Energy Laboratory)  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLas Conchas recoveryLaboratory | National Nuclearover two yearsNPResults give insight on aUsing a

351

Kinematical studies of the flows around free or surface-mounted obstacles; applying topology to flow visualization  

E-Print Network [OSTI]

the wave potential energy, to sufficient accuracy. (It is the Lagrangian, not the Eulerian, disturbance Magnetohydrodynamic flows and turbulence : a report on the Second Bat-Sheva Seminar by H. BRANOVER,J. C. R. HUNT,M. R by a factor of 10-1 times that of the liquid crz) occupying the centre. The efficiency of these generators can

Cambridge, University of

353

Nearby Supernova Factory Observations of SN 2006D: On Sporadic Carbon Signatures in Early Type Ia Supernova Spectra  

E-Print Network [OSTI]

with low volume-?lling factor. Subject headings: supernovae:general — supernovae: individual (SN 2006D)Introduction Type Ia supernovae (SNe Ia) make valuable

2006-01-01T23:59:59.000Z

354

CARMA SURVEY TOWARD INFRARED-BRIGHT NEARBY GALAXIES (STING): MOLECULAR GAS STAR FORMATION LAW IN NGC 4254  

SciTech Connect (OSTI)

This study explores the effects of different assumptions and systematics on the determination of the local, spatially resolved star formation law. Using four star formation rate (SFR) tracers (H{alpha} with azimuthally averaged extinction correction, mid-infrared 24 {mu}m, combined H{alpha} and mid-infrared 24 {mu}m, and combined far-ultraviolet and mid-infrared 24 {mu}m), several fitting procedures, and different sampling strategies, we probe the relation between SFR and molecular gas at various spatial resolutions (500 pc and larger) and surface densities ({Sigma}{sub H{sub 2}})approx. 10-245 M{sub sun} pc{sup -2}) within the central {approx}6.5 kpc in the disk of NGC 4254. We explore the effect of diffuse emission using an unsharp masking technique with varying kernel size. The fraction of diffuse emission, f{sub DE}, thus determined is a strong inverse function of the size of the filtering kernel. We find that in the high surface brightness regions of NGC 4254 the form of the molecular gas star formation law is robustly determined and approximately linear ({approx}0.8-1.1) and independent of the assumed fraction of diffuse emission and the SFR tracer employed. When the low surface brightness regions are included, the slope of the star formation law depends primarily on the assumed fraction of diffuse emission. In such a case, results range from linear when the fraction of diffuse emission in the SFR tracer is f{sub DE} {approx}< 30% (or when diffuse emission is removed in both the star formation and the molecular gas tracer) to super-linear ({approx}1.4) when f{sub DE} {approx}> 50%. We find that the tightness of the correlation between gas and star formation varies with the choice of star formation tracer. The 24 {mu}m SFR tracer by itself shows the tightest correlation with the molecular gas surface density, whereas the H{alpha} corrected for extinction using an azimuthally averaged correction shows the highest dispersion. We find that for R < 0.5R{sub 25} the local star formation efficiency is constant and similar to that observed in other large spirals, with a molecular gas depletion time {tau}{sub dep} {approx} 2 Gyr.

Rahman, Nurur; Bolatto, Alberto D.; Herrera-Camus, Rodrigo; Jameson, Katherine; Vogel, Stuart N. [Department of Astronomy, University of Maryland, College Park, MD 20742 (United States); Wong, Tony; Xue Rui [Department of Astronomy, University of Illinois, Urbana-Champaign, IL 61801 (United States); Leroy, Adam K. [National Radio Astronomy Observatory, Charlottesville, VA (United States); Walter, Fabian [Max-Planck-Institute fur Astronomie, Konigstuhl 17, 69117 Heidelberg (Germany); Rosolowsky, Erik [I. K. Barber School of the Arts and Science, University of British Columbia, Kelowna, BC V1V1V7 (Canada); West, Andrew A. [Department of Astronomy, Boston University, Boston, MA 02215 (United States); Bigiel, Frank; Blitz, Leo [Department of Astronomy, University of California, Berkeley, CA 94720 (United States); Ott, Juergen, E-mail: nurur@astro.umd.edu [National Radio Astronomy Observatory, Socorro, NM 87801 (United States)

2011-04-01T23:59:59.000Z

355

A case study of electron precipitation in the late substorm growth phase on and nearby a preonset arc  

E-Print Network [OSTI]

Finnish Meteorological Institute, Helsinki, Finland Received: 15 September 1997 a Accepted: 26 March 1998, and consequently a dayside reconnection resulting in en- hanced convection directly driven by the solar wind), and a loading of energy in the magnetotail will go on until the onset of the substorm, when a second current

Boyer, Edmond

356

AN INITIAL LOOK AT THE FAR-INFRAREDRADIO CORRELATION WITHIN NEARBY STAR-FORMING GALAXIES USING THE SPITZER SPACE TELESCOPE  

E-Print Network [OSTI]

THE SPITZER SPACE TELESCOPE E. J. Murphy,1 R. Braun,2 G. Helou,3 L. Armus,3 J. D. P. Kenney,1 K. D. Gordon,4 G. Cannon,6 B. T. Draine,8 C. W. Engelbracht,4 D. J. Hollenbach,9 T. H. Jarrett,3 L. J. Kewley,10 C. Leitherer,7 A. Li,11 M. J. Meyer,7 M. W. Regan,7 G. H. Rieke,4 M. J. Rieke,4 H. Roussel,3 K. Sheth,3 J. D. T

Draine, Bruce T.

357

Nearby Large-Scale Structures and the Zone of Avoidance ASP Conference Series, Vol. ASP Conference Series, Vol. ***, 2004  

E-Print Network [OSTI]

projection in Galactic coordinates. Stars from the PSC area also displayed. Prominent large-scale structures) with deep optical searches are compared to the distribution of objects in the 2MASS Ex- tended Source in the NIR. Galaxies can be identified in 2MASS at optical extinction layers of over 10m . However, star

Kraan-Korteweg, Renée C.

358

THE SPITZER c2d SURVEY OF NEARBY DENSE CORES. VII. CHEMISTRY AND DYNAMICS IN L43  

SciTech Connect (OSTI)

We present results from the Spitzer Space Telescope and molecular line observations of nine species toward the dark cloud L43. The Spitzer images and molecular line maps suggest that it has a starless core and a Class I protostar evolving in the same environment. CO depletion is seen in both sources, and DCO{sup +} lines are stronger toward the starless core. With a goal of testing the chemical characteristics from pre- to protostellar stages, we adopt an evolutionary chemical model to calculate the molecular abundances and compare with our observations. Among the different model parameters we tested, the best-fit model suggests a longer total timescale at the pre-protostellar stage, but with faster evolution at the later steps with higher densities.

Chen, Jo-Hsin; Evans, Neal J. [Department of Astronomy, University of Texas at Austin, Austin, Texas 78712-1083 (United States); Lee, Jeong-Eun [Department of Astronomy and Space Science, Astrophysical Research Center for the Structure and Evolution of the Cosmos, Sejong University, Seoul 143-747 (Korea, Republic of); Bourke, Tyler L., E-mail: jhchen@astro.as.utexas.ed, E-mail: nje@astro.as.utexas.ed, E-mail: jelee@sejong.ac.k, E-mail: tbourke@cfa.harvard.ed [Harvard-Smithonian Center for Astrophysics, 60 Garden St., Cambridge MA 02138 (United States)

2009-11-10T23:59:59.000Z

359

Simulation study of dose enhancement in a cell due to nearby carbon and oxygen in particle radiotherapy  

E-Print Network [OSTI]

The aim of this study is to investigate the dose-deposition enhancement by alpha-particle irradiation in a cellular model using carbon and oxygen chemical compositions.A simulation study was performed to study dose enhancement due to carbon and oxygen for a human cell where Geant4 code used for the alpha-particle irradiation to the cellular phantom. The characteristic of dose enhancement in the nucleus and cytoplasm by the alpha-particle radiation was investigated based on concentrations of the carbon and oxygen compositions and was compared with those by gold and gadolinium.The results show that both the carbon and oxygen-induced dose enhancement was found to be more effective than those of gold and gadolinium. We found that the dose-enhancement effect was more dominant in the nucleus than in the cytoplasm if carbon or oxygen is uniformly distributed in a whole cell. In the condition that the added chemical composition was inserted only into the cytoplasm, the effect of the dose enhancement in nucleus become...

Shin, Jae Ik; Cho, Sungho; Kim, Eun Ho; Song, Yongkeun; Jung, Won-Gyun; Yoo, SeungHoon; Shin, Dongho; Lee, Se Byeong; Yoon, Myonggeun; Incerti, Sebastian; Geso, Moshi; Rosenfeld, Anatoly B

2015-01-01T23:59:59.000Z

360

Jeans, Boots, and Starry Skies: Tales of a Gay Country-and-Western Bar and Places Nearby.  

E-Print Network [OSTI]

??Fourteen short stories, with five interspersed vignettes, describe the lives of gay people in the southwestern United States, centered around a fictional gay country-and-western bar… (more)

Gay, Wayne Lee

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "tall obstacles nearby" 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

TECHNICAL EVALUATION OF TEMPORAL GROUNDWATER MONITORING VARIABILITY IN MW66 AND NEARBY WELLS, PADUCAH GASEOUS DIFFUSION PLANT  

SciTech Connect (OSTI)

Evaluation of disposal records, soil data, and spatial/temporal groundwater data from the Paducah Gaseous Diffusion Plant (PGDP) Solid Waste Management Unit (SWMU) 7 indicate that the peak contaminant concentrations measured in monitoring well (MW) 66 result from the influence of the regional PGDP NW Plume, and does not support the presence of significant vertical transport from local contaminant sources in SWMU 7. This updated evaluation supports the 2006 conceptualization which suggested the high and low concentrations in MW66 represent different flow conditions (i.e., local versus regional influences). Incorporation of the additional lines of evidence from data collected since 2006 provide the basis to link high contaminant concentrations in MW66 (peaks) to the regional 'Northwest Plume' and to the upgradient source, specifically, the C400 Building Area. The conceptual model was further refined to demonstrate that groundwater and the various contaminant plumes respond to complex site conditions in predictable ways. This type of conceptualization bounds the expected system behavior and supports development of environmental cleanup strategies, providing a basis to support decisions even if it is not feasible to completely characterize all of the 'complexities' present in the system. We recommend that the site carefully consider the potential impacts to groundwater and contaminant plume migration as they plan and implement onsite production operations, remediation efforts, and reconfiguration activities. For example, this conceptual model suggests that rerouting drainage water, constructing ponds or basin, reconfiguring cooling water systems, capping sites, decommissioning buildings, fixing (or not fixing) water leaks, and other similar actions will potentially have a 'direct' impact on the groundwater contaminant plumes. Our conclusion that the peak concentrations in MW66 are linked to the regional PGDP NW Plume does not imply that there TCE is not present in SWMU 7. The available soil and groundwater data indicate that the some of the waste disposed in this facility contacted and/or were contaminated by TCE. In our assessment, the relatively small amount of TCE associated with SWMU 7 is not contributing detectable TCE to the groundwater and does not represent a significant threat to the environment, particularly in an area where remediation and/or management of TCE in the NW plume will be required for an extended timeframe. If determined to be necessary by the PGDP team and regulators, additional TCE characterization or cleanup activities could be performed. Consistent with the limited quantity of TCE in SWMU 7, we identify a range of low cost approaches for such activities (e.g., soil gas surveys for characterization or SVE for remediation). We hope that this information is useful to the Paducah team and to their regulators and stakeholders to develop a robust environmental management path to address the groundwater and soil contamination associated with the burial ground areas.

Looney, B.; Eddy-Dilek, C.

2012-08-28T23:59:59.000Z

362

Stellar Parameters for HD 69830, a Nearby Star with Three Neptune Mass Planets and an Asteroid Belt  

E-Print Network [OSTI]

We used the CHARA Array to directly measure the angular diameter of HD 69830, home to three Neptune mass planets and an asteroid belt. Our measurement of 0.674+/-0.014 milli-arcseconds for the limb-darkened angular diameter of this star leads to a physical radius of R$_*$ = 0.9058$\\pm$0.0190 R\\sun and luminosity of L* = 0.622+/-0.014 Lsun when combined with a fit to the spectral energy distribution of the star. Placing these observed values on an Hertzsprung-Russel (HR) diagram along with stellar evolution isochrones produces an age of 10.6+/-4 Gyr and mass of 0.863$\\pm$0.043 M\\sun. We use archival optical echelle spectra of HD 69830 along with an iterative spectral fitting technique to measure the iron abundance ([Fe/H]=-0.04+/-0.03), effective temperature (5385+/-44 K) and surface gravity (log g = 4.49+/-0.06). We use these new values for the temperature and luminosity to calculate a more precise age of 7.5+/-Gyr. Applying the values of stellar luminosity and radius to recent models on the optimistic locati...

Tanner, Angelle; von Braun, Kaspar; Kane, Stephen; Brewer, John M; Farrington, Chris; van Belle, Gerard T; Beichman, Charles A; Fischer, Debra; Brummelaar, Theo A ten; McAlister, Harold A; Schaefer, Gail

2014-01-01T23:59:59.000Z

363

Nearby Supernova Factory Observations of SN 2005gj: Another Type Ia Supernova in a Massive Circumstellar Envelope  

E-Print Network [OSTI]

scenarios both involve the thermonuclear disruption of whitelead to new channels for thermonuclear SNe. For example,thermonuclear SNe inside a dense

2006-01-01T23:59:59.000Z

364

ALFALFA Discovery of the Nearby Gas-Rich Dwarf Galaxy Leo P. IV. Distance Measurement from LBT Optical Imaging  

E-Print Network [OSTI]

Leo P is a low-luminosity dwarf galaxy discovered through the blind HI Arecibo Legacy Fast ALFA (ALFALFA) survey. The HI and follow-up optical observations have shown that Leo P is a gas-rich dwarf galaxy with both active star formation and an underlying older population, as well as an extremely low oxygen abundance. Here, we measure the distance to Leo P by applying the tip of the red giant branch (TRGB) distance method to photometry of the resolved stellar population from new Large Binocular Telescope (LBT) V and I band imaging. We measure a distance modulus of 26.19 (+0.17/-0.50) mag corresponding to a distance of 1.72 (+0.14/-0.40) Mpc. Although our photometry reaches 3 magnitudes below the TRGB, the sparseness of the red giant branch (RGB) yields higher uncertainties on the lower limit of the distance. Leo P is outside the Local Group with a distance and velocity consistent with the local Hubble flow. While located in a very low-density environment, Leo P lies within ~0.5 Mpc of a loose association of dw...

McQuinn, Kristen B W; Berg, Danielle; Cannon, John M; Salzer, John J; Adams, Elizabeth A K; Dolphin, Andrew; Giovanelli, Riccardo; Haynes, Martha P; Rhode, Katherine L

2013-01-01T23:59:59.000Z

365

ALFALFA Discovery of the Nearby Gas-Rich Dwarf Galaxy Leo~P. II. Optical Imaging Observations  

E-Print Network [OSTI]

We present results from ground-based optical imaging of a low-mass dwarf galaxy discovered by the ALFALFA 21-cm HI survey. Broadband (BVR) data obtained with the WIYN 3.5-m telescope at Kitt Peak National Observatory (KPNO) are used to construct color-magnitude diagrams of the galaxy's stellar population down to V_0 ~ 25. We also use narrowband H-alpha imaging from the KPNO 2.1-m telescope to identify an HII region in the galaxy. We use these data to constrain the distance to the galaxy to be between 1.5 and 2.0 Mpc. This places Leo P within the Local Volume but beyond the Local Group. Its properties are extreme: it is the lowest-mass system known that contains significant amounts of gas and is currently forming stars.

Rhode, Katherine L; Haurberg, Nathalie C; Van Sistine, Angela; Young, Michael D; Haynes, Martha P; Giovanelli, Riccardo; Cannon, John M; Skillman, Evan D; McQuinn, Kristen B W; Adams, Elizabeth A K

2013-01-01T23:59:59.000Z

366

ALFALFA Discovery of the Nearby Gas-rich Dwarf Galaxy Leo P. V. Neutral Gas Dynamics and Kinematics  

E-Print Network [OSTI]

We present new HI spectral line imaging of the extremely metal-poor, star-forming dwarf irregular galaxy Leo P. Our HI images probe the global neutral gas properties and the local conditions of the interstellar medium (ISM). The HI morphology is slightly elongated along the optical major-axis. We do not find obvious signatures of interaction or infalling gas at large spatial scales. The neutral gas disk shows obvious rotation, although the velocity dispersion is comparable to the rotation velocity. The rotation amplitude is estimated to be V_c = 15 +/- 5 km/s. Within the HI radius probed by these observations, the mass ratio of gas to stars is roughly 2:1, while the ratio of the total mass to the baryonic mass is ~15:1. We use this information to place Leo P on the baryonic Tully-Fisher relation, testing the baryonic content of cosmic structures in a sparsely populated portion of parameter space that has hitherto been occupied primarily by dwarf spheroidal galaxies. We detect the signature of two temperature ...

Bernstein-Cooper, Elijah Z; Elson, Edward C; Warren, Steven R; Chengalur, Jayaram; Skillman, Evan D; Adams, Elizabeth A K; Bolatto, Alberto D; Giovanelli, Riccardo; Haynes, Martha P; McQuinn, Kristen B W; Pardy, Stephen A; Rhode, Katherine L; Salzer, John J

2014-01-01T23:59:59.000Z

367

Searching for GRB remnants in nearby galaxies S. G. Bhargavi , J. Rhoads + , R. perna # , J. Feldmeier and J. Greiner  

E-Print Network [OSTI]

: due to the effect of radiation of GRB and its afterglow. The UV afterglow flux of a GRB heats gas, the cooling rate being as slow as #24; 10 5 yrs Slowing remnant : due to the slowing blast­wave. The relativistically expanding blast wave resulting from a GRB explosion takes #24; 10 7 years to slow down and merge

Greiner, Jochen

368

Assessing effects of highway bridge deck runoff on near-by recieving waters in coastal margins using remote monitoring techniques  

E-Print Network [OSTI]

different pollutant loading by sampling the receiving water body (Clear Creek). The collected samples were analyzed for total suspended solids, toxic metals, and other relevant constituents of concerns. The results illustrated that the runoff from... the bridge deck iv exhibited low total suspended solids concentr ations (which were highest in the creek). However, other metal constituents like the zi nc and cooper concentration were high and above standards. The phosphate concentrations...

Nwaneshiudu, Oke

2005-02-17T23:59:59.000Z

369

2MASS J035523.37+113343.7: A YOUNG, DUSTY, NEARBY, ISOLATED BROWN DWARF RESEMBLING A GIANT EXOPLANET  

SciTech Connect (OSTI)

We present parallax and proper motion measurements, near-infrared spectra, and Wide-field Infrared Survey Explorer photometry for the low surface gravity L5{gamma} dwarf 2MASS J035523.37+113343.7 (2M0355). We use these data to evaluate photometric, spectral, and kinematic signatures of youth as 2M0355 is the reddest isolated L dwarf yet classified. We confirm its low-gravity spectral morphology and find a strong resemblance to the sharp triangular shaped H-band spectrum of the {approx}10 Myr planetary-mass object 2M1207b. We find that 2M0355 is underluminous compared to a normal field L5 dwarf in the optical and Mauna Kea Observatory J, H, and K bands and transitions to being overluminous from 3 to 12 {mu}m, indicating that enhanced photospheric dust shifts flux to longer wavelengths for young, low-gravity objects, creating a red spectral energy distribution. Investigating the near-infrared color-magnitude diagram for brown dwarfs confirms that 2M0355 is redder and underluminous compared to the known brown dwarf population, similar to the peculiarities of directly imaged exoplanets 2M1207b and HR8799bcd. We calculate UVW space velocities and find that the motion of 2M0355 is consistent with young disk objects (<2-3 Gyr) and it shows a high likelihood of membership in the AB Doradus association.

Faherty, Jacqueline K. [Department of Astronomy, Universidad de Chile Cerro Calan, Las Condes (Chile); Rice, Emily L.; Cruz, Kelle L.; Nunez, Alejandro [Department of Astrophysics , American Museum of Natural History, Central Park West at 79th Street, New York, NY 10034 (United States); Mamajek, Eric E., E-mail: jfaherty17@gmail.com, E-mail: jfaherty@amnh.org [Cerro Tololo Inter-American Observatory, Casilla 603, La Serena (Chile)

2013-01-01T23:59:59.000Z

370

The ESO Nearby Abell Cluster Survey IX. The morphology-radius and morphology-density relations in rich galaxy clusters  

E-Print Network [OSTI]

We study the morphology-radius (MR-) and morphology-density (MD-) relations for a sample of about 850 galaxies (with M = -22), the S0 galaxies and the early spirals have different Sigma1-distributions. The reason for this is that Sigma1 is much less correlated with R than is Sigma10, and thus has much less cross-talk from the (MR-) relation. On average, the 'normal' ellipticals populate environments with higher projected density than do the S0 galaxies while the early spirals populate even less dense environments. The segregation of the brightest ellipticals and the late spirals is driven mostly by global factors, while the segregation between 'normal' ellipticals, S0 galaxies and early spirals is driven primarily by local factors.

T. Thomas; P. Katgert

2005-10-10T23:59:59.000Z

371

Near-Infrared Adaptive Optics Imaging of the Central Regions of Nearby Sc Galaxies: I. M33  

E-Print Network [OSTI]

Near-infrared images obtained with the Canada-France-Hawaii Telescope (CFHT) Adaptive Optics Bonnette (AOB) are used to investigate the stellar content within 18 arcsec of the center of the Local Group spiral galaxy M33. AGB stars with near-infrared spectral-energy distributions similar to those of giants in the solar neighborhood and Baade's Window are detected over most of the field. The bolometric luminosity function (LF) of these stars has a discontinuity near M_{bol} = -5.25, and comparisons with evolutionary tracks suggest that most of the AGB stars formed in a burst of star formation 1 - 3 Gyr in the past. The images are also used to investigate the integrated near-infrared photometric properties of the nucleus and the central light concentration. The nucleus is bluer than the central light concentration, in agreement with previous studies at visible wavelengths. The CO index of the central light concentration 0.5 arcsec from the galaxy center is 0.05, which corresponds to [Fe/H] = -1.2 for simple stellar systems. Hence, the central light concentration could not have formed from the chemically-enriched material that dominates the present-day inner disk of M33.

T. J. Davidge

1999-10-18T23:59:59.000Z

372

A Near-Infrared Photometric Survey of Metal-Poor Inner Spheroid Globular Clusters and Nearby Bulge Fields  

E-Print Network [OSTI]

Images recorded through J, H, K, 2.2 micron continuum and CO filters have been obtained of a sample of metal-poor ([Fe/H] < -1.3) globular clusters in the inner spheroid of the Galaxy. The shape and color of the upper giant branch on the (K, J-K) CMD, combined with the K brightness of the RGB-tip, are used to estimate the metallicity, reddening, and distance of each cluster. CO indices are used to identify bulge stars, which will bias metallicity and distance estimates if not removed from the data. Bulge fields were also observed near each cluster. The slope of the bulge giant branch luminosity function does not vary between most fields, although the LFs in Baade's Window and near NGC 6273 are significantly shallower than average. The data also suggest that the HB content may not be uniform throughout the bulge, in the sense that a larger than average number of red HB stars may occur in fields closest to the Galactic Center.

T. J. Davidge

2000-08-25T23:59:59.000Z

373

Broad-band and Ha surface photometry of the central regions of nearby active galaxies I. Observations  

E-Print Network [OSTI]

ElectroÃ?nica, Tonantzintla, Puebla, Mexico Accepted 1999 September 2. Received 1999 July 12; in original is the requirement of substantial amounts of gas in the galaxy centre. This gas has to be transported from reservoirs of galaxies hosting emission-line nuclei, in the sense that galaxies with AGN- like nuclei tend to have Hubble

Aretxaga, Itziar

374

THE STAR FORMATION IN RADIO SURVEY: GBT 33 GHz OBSERVATIONS OF NEARBY GALAXY NUCLEI AND EXTRANUCLEAR STAR-FORMING REGIONS  

SciTech Connect (OSTI)

We present 33 GHz photometry of 103 galaxy nuclei and extranuclear star-forming complexes taken with the Green Bank Telescope as part of the Star Formation in Radio Survey. Among the sources without evidence for an active galactic nucleus, and also having lower frequency radio data, we find a median thermal fraction at 33 GHz of Almost-Equal-To 76% with a dispersion of Almost-Equal-To 24%. For all sources resolved on scales {approx}<0.5 kpc, the thermal fraction is even larger, being {approx}>90%. This suggests that the rest-frame 33 GHz emission provides a sensitive measure of the ionizing photon rate from young star-forming regions, thus making it a robust star formation rate (SFR) indicator. Taking the 33 GHz SFRs as a reference, we investigate other empirical calibrations relying on different combinations of warm 24 {mu}m dust, total infrared (IR; 8-1000 {mu}m), H{alpha} line, and far-UV continuum emission. The recipes derived here generally agree with others found in the literature, albeit with a large dispersion that most likely stems from a combination of effects. Comparing the 33 GHz to total IR flux ratios as a function of the radio spectral index, measured between 1.7 and 33 GHz, we find that the ratio increases as the radio spectral index flattens which does not appear to be a distance effect. Consequently, the ratio of non-thermal to total IR emission appears relatively constant, suggesting only moderate variations in the cosmic-ray electron injection spectrum and ratio of synchrotron to total cooling processes among star-forming complexes. Assuming that this trend solely arises from an increase in the thermal fraction sets a maximum on the scatter of the non-thermal spectral indices among the star-forming regions of {sigma}{sub {alpha}{sup N}{sup T}}{approx}<0.13.

Murphy, E. J. [Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101 (United States); Bremseth, J. [Department of Physics and Astronomy, Pomona College, Claremont, CA 91711 (United States); Mason, B. S.; Condon, J. J. [National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903 (United States); Schinnerer, E. [Max Planck Institut fuer Astronomie, Koenigstuhl 17, D-69117 Heidelberg (Germany); Aniano, G. [Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544 (United States); Armus, L. [Spitzer Science Center, California Institute of Technology, MC 314-6, Pasadena, CA 91125 (United States); Helou, G. [California Institute of Technology, MC 100-22, Pasadena, CA 91125 (United States); Turner, J. L. [Department of Physics and Astronomy, UCLA, Los Angeles, CA 90095 (United States); Jarrett, T. H., E-mail: emurphy@obs.carnegiescience.edu [Infrared Processing and Analysis Center, California Institute of Technology, MC 100-22, Pasadena, CA 91125 (United States)

2012-12-20T23:59:59.000Z

375

The nearby eclipsing stellar system delta Velorum - I. Origin of the infrared excess from VISIR and NACO imaging  

E-Print Network [OSTI]

- Context: The triple stellar system delta Vel system presents a significant infrared excess, whose origin is still being debated. A large infrared bow shock has been discovered using Spitzer/MIPS observations. Although it appears as a significant contributor to the measured IR excess, the possibility exists that a circumstellar IR excess is present around the stars of the system. - Aims: The objective of the present VISIR and NACO observations is to identify whether one of the stars of the delta Vel system presents a circumstellar photometric excess in the thermal IR domain and to quantify it. - Methods: We observed delta Vel using the imaging modes of the ESO/VLT instruments VISIR (in BURST mode) and NACO to resolve the A-B system (0.6" separation) and obtain the photometry of each star. We also obtained one NACO photometry epoch precisely at the primary (annular) eclipse of delta Vel Aa by Ab. - Results: Our photometric measurements with NACO (2.17 mic), complemented by the existing visible photometry allowed us to reconstruct the spectral energy distribution of the three stars. We then compared the VISIR photometry (8.6-12.8 mic) to the expected photospheric emission from the three stars at the corresponding wavelengths. - Conclusions: We can exclude the presence of a circumstellar thermal infrared excess around delta Vel A or B down to a few percent level. This supports the conclusions of Gaspar et al. (2008) that the IR excess of delta Vel has an interstellar origin, although a cold circumstellar disk could still be present. In addition, we derive the spectral types of the three stars Aa, Ab, and B (respectively A2IV, A4V and F8V), and we estimate the age of the system around 400-500 Myr.

Pierre Kervella; Frédéric Thévenin; Monika Petr-Gotzens

2008-11-11T23:59:59.000Z

376

Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Southern Sample  

E-Print Network [OSTI]

We are obtaining spectra, spectral types and basic physical parameters for the nearly 3600 dwarf and giant stars earlier than M0 in the Hipparcos catalog within 40pc of the Sun. Here we report on results for 1676 stars in the southern hemisphere observed at Cerro Tololo Interamerican Observatory and Steward Observatory. These results include new, precise, homogeneous spectral types, basic physical parameters (including the effective temperature, surface gravity, and metallicity, [M/H]) and measures of the chromospheric activity of our program stars. We include notes on astrophysically interesting stars in this sample, the metallicity distribution of the solar neighborhood and a table of solar analogues. We also demonstrate that the bimodal nature of the distribution of the chromospheric activity parameter log R'HK depends strongly on the metallicity, and we explore the nature of the ``low-metallicity'' chromospherically active K-type dwarfs.

R. O. Gray; C. J. Corbally; R. F. Garrison; M. T. McFadden; E. J. Bubar; C. E. McGahee; A. A. O'Donoghue; E. R. Knox

2006-03-28T23:59:59.000Z

377

IEEE TRANSACTIONS ON COMPUTER-AIDED DESIGN OF INTEGRATED CIRCUITS AND SYSTEMS, VOL. 27, NO. 11, NOVEMBER 2008 2007 Multilayer Obstacle-Avoiding Rectilinear Steiner  

E-Print Network [OSTI]

an effective algorithm for the ML-OARSMT problem to facilitate the design flow. However, there is no existing, National Taiwan University, Taipei 106, Taiwan (e-mail: enorm@eda.ee.ntu.edu.tw; aaron@eda.ee.ntu.edu.tw; bo27@ eda.ee.ntu.edu.tw). K.-C. Hsu was with the Department of Electrical Engineering, National

Chang, Yao-Wen

378

Obstacles to the application of soil and water conservation practices on tenant-operated farms cooperating with the Navarro-Hill Soil Conservation District  

E-Print Network [OSTI]

) In sharing rights 1n land, ths owner always holds the grestsz proportion, Leasing srrsngsments snd statutczy enactments nave sstab3Lshsd snd maintained the owner's position with respect t. possession snd use, gush s situst1on moxa or less ignores ths..., initicttvex financial atanKng, and maqy other faotors, The landoMner and ths tenant hold, to a certain extent?veto pouers over tha other, Therefoxe, full agxeenent must be reached between ths partiea to ths lease before a successful conservation program...

Boykin, Calvin C

1956-01-01T23:59:59.000Z

379

Motion Planning in the Presence of Motling Obstacles 765 trajectories but cannot rotate. This problem has many applications to robot, automobile, and  

E-Print Network [OSTI]

. This problem has many applications to robot, automobile, and aircraft collision avoidance. Our main positive) Automobile Collision Avoidance. B is an automobile with an automatic steering system that must avoid collision with other automobiles with known trajectories on a highway. #12;766 J. REIF AND M. SHARIR (3

Reif, John H.

380

How Accelerated Nursing Students Learn| A Comparative Case Study of the Facilitators, Barriers, Learning Strategies, Challenges, and Obstacles of Students in an Accelerated Nursing Program.  

E-Print Network [OSTI]

?? Accelerated nursing programs for non-nurse college graduates are a relatively new concept in nursing education. They were developed within generic nursing programs and individualized… (more)

Johnson Lewis, Edna

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "tall obstacles nearby" 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

Proceedings of the 1998 IEEE International Conference on Robotics and Automation. Leuven, Belgium, May 1621, 1998, pp. 1572 -1577 VFH+: Reliable Obstacle Avoidance for Fast Mobile Robots  

E-Print Network [OSTI]

to this algorithm is a map grid of the local environment, called histogram grid [Borenstein and Koren, 1991], which. In the first three stages, the two-dimensional map grid is reduced to one-dimensional polar histograms the active region Ca of the map grid C onto the primary polar histogram Hp . The active region Ca

Borenstein, Johann

382

Legal obstacles and incentives to the third development of small-scale hydroelectric potential in the six New England states: executive summary  

SciTech Connect (OSTI)

This executive summary describes the relationship of Federal law and regulation to state law and regulation of small-scale hydroelectric facilities. It also highlights important features of the constitutional law, statutory law, case law, and regulations of each of the six New England states. The summary may serve as a concise overview of and introduction to the detailed reports prepared by the Energy Law Institute on the legal and regulatory systems of each of the six states. The dual regulatory system is a function of the federalist nature of our government. This dual system is examined from the standpoint of the appropriate legal doctrine, i.e., the law of pre-emption, and the application of this law to the case of hydroelectric development. The regulation of small dams are discussed and flow diagrams of the regulations are presented for each of the six states - Maine, Massachusetts, Vermont, New Hampshire, Vermont, and Connecticut.

None,

1980-05-01T23:59:59.000Z

383

Distributed Energy Systems in California's Future: A Preliminary Report Volume 2  

E-Print Network [OSTI]

wind turbine, which is basically a propeller (2 or 3 blades) mounted on a tall (approximately 110 meters) tower.

Balderston, F.

2010-01-01T23:59:59.000Z

384

"Safety Concrete" A Material Designed to Fail  

E-Print Network [OSTI]

platen Bottom steel platen 10 ft tall PVC pipe (3" ID) Outer PVC shield collects fragments Sample #12

385

School of Architecture Graduation Exercises FINAL Simple Gifts/ Connective Tissues  

E-Print Network [OSTI]

, as first founded on the deep quarries of resonant histories, tall tales, fables if not enduring myths, out

Whittle, Mark

386

An experimental study of intraspecific competition within several forage crops (1).  

E-Print Network [OSTI]

., tall fescue Festuca arundinacea Schreb., lucerne Medicago sativa L. and red clover Trifolium pratense L. Departures from this general rule are discussed. Additional key-words : Cocksfoot, tall fescue, lucerne, red crops (lucerne, red clover, cocksfoot, tall fescue). This program was oriented towards two distinct

Paris-Sud XI, Université de

387

The HARPS search for southern extra-solar planets. VI. A Neptune-mass planet around the nearby M dwarf Gl 581  

E-Print Network [OSTI]

We report the discovery of a Neptune-mass planet around Gl 581 (M3V, M = 0.31 Msol), based on precise Doppler measurements with the HARPS spectrograph at La Silla Observatory. The radial velocities reveal a circular orbit of period P = 5.366 days and semi-amplitude K1 = 13.2 m/s. The resulting minimum mass of the planet (m2 sin i) is only 0.052 Mjup = 0.97 Mnep = 16.6 Mearth making Gl 581b one of the lightest extra-solar planet known to date. The Gl 581 planetary system is only the third centered on an M dwarf, joining the Gl 876 three-planet system and the lone planet around Gl 436. Its discovery reinforces the emerging tendency of such planets to be of low mass, and found at short orbital periods. The statistical properties of the planets orbiting M dwarfs do not seem to match a simple mass scaling of their counterparts around solar-type stars.

X. Bonfils; T. Forveille; X. Delfosse; S. Udry; M. Mayor; C. Perrier; F. Bouchy; F. Pepe; D. Queloz; J. -L. Bertaux

2005-09-08T23:59:59.000Z

388

Deformation of Compliant Fault Zones Induced by Nearby Earthquakes: Theoretical Investigations in Three Dimensions and Applications to The East California Shear Zone  

E-Print Network [OSTI]

primarily examine the plastic strain distribution within the fault zone and the displacement field that characterizes the effects of the presence of the fault zone. I find that when the fault zone rocks are close to failure in the prestress field, plastic...

Kang, Jingqian

2014-02-21T23:59:59.000Z

389

Discovery of a nearby twin of SN1987A's nebula around the luminous blue variable HD168625: Was Sk--69 202 an LBV?  

E-Print Network [OSTI]

Spitzer images of the luminous blue variable (LBV) candidate HD168625 reveal the existence of a bipolar nebula several times larger than its previously-known equatorial dust torus. The outer nebula of HD168625 has a full extent of about 80 arcsec or 0.85 pc, and one of the lobes has a well-defined polar ring. The nebula is a near twin of the triple-ring system around SN1987A. Because of these polar rings, and accounting for stellar/progenitor luminosity, HD168625 is an even closer twin of SN1987A than the B supergiant Sher 25 in NGC3603. HD168625's nebula was probably ejected during a giant LBV eruption and not during a red supergiant phase, so its similarity to the nebula around SN1987A may open new possibilities for the creation of SN1987A's rings. Namely, the hypothesis that Sk-69 202 suffered an LBV-like eruption would avert the complete surrender of single star models for its bipolar nebula by offering an alternative to an unlikely binary merger scenario. It also hints that LBVs are the likely progenitors of some type II supernovae, and that HD168625's nebula is a good example of a pre-explosion environment.

Nathan Smith

2006-11-16T23:59:59.000Z

390

A comparison of the distribution of the Echinodermata of a coral community with that of a nearby rock outcrop on the Texas continental shelf  

E-Print Network [OSTI]

TAYLOR, ATLANTIS and the OREGON, most were concerned either with hydrography or deep water research As pointed out by A. H. Clark (1954), the major portion of' knowledge of the echinoderms of the Gulf of Nexico comes from the work done.... The literature of the Class Asteroidea, extends back to the mid-1800's dominated by E Perrier as well as both Louis and Alexander Agassiz Among later contributors were A H. and H L. Clark~ A E v'li, w. p. Slddl'k th~chll t 'd, d W. K Fisher. Of the many...

DuBois, Random

1975-01-01T23:59:59.000Z

391

The 2dF Galaxy Redshift Survey: The population of nearby radio galaxies at the 1 mJy level  

E-Print Network [OSTI]

We use redshift determinations and spectral analysis of galaxies in the 2dF Galaxy Redshift Survey to study the properties of local radio sources with $S\\ge 1$ mJy. 557 objects drawn from the FIRST survey, corresponding to 2.3 per cent of the total radio sample, are found in the 2dFGRS cataloge within the area $9^h 48^m \\simlt {\\rm RA}({\\rm 2000}) \\simlt 14^h 32^m$ and $-2.77^\\circ \\simlt {\\rm dec}({\\rm 2000}) \\simlt 2.25^\\circ$, down to a magnitude limit $b_J= 19.45$. The excellent quality of 2dF spectra allows us to divide these sources into classes, according to their optical spectra. Radio galaxies (i.e. absorption systems, mainly belonging to the class of FR I sources, whose spectra may or may not show emission lines due to AGN activity) make up 63 per cent of the spectroscopic sample; they are characterized by relatively high radio-to-optical ratios, red colours and luminosities $10^{21}\\simlt P_{1.4{\\rm GHz}} W Hz^${-1}$ sr$^{-1}$ \\simlt 10^{24}$. Actively star-forming galaxies instead contribute with 30 per cent to the total sample. These objects -- principally found at low redshifts ($z \\simlt 0.1$) -- in general show low radio-to-optical ratios, blue colours and low radio luminosities. We also found 18 Seyfert 2 galaxies and 4 Seyfert 1's. Analysis of the local radio luminosity function shows that radio galaxies are well described by models that assume pure luminosity evolution, at least down to radio powers $P_{1.4{\\rm GHz}}\\simlt 10^{20.5} W Hz$^{-1}$ sr$^{-1}$ Late-type galaxies, whose relative contribution to the RLF is found to be lower than was predicted by previous work, present a luminosity function which is compatible with the IRAS galaxy LF, and therefore plausibly constitute the radio counterpart of the dusty spirals and starbursts that dominate the counts at 60 $\\mu$m.

M. Magliocchetti; S. J. Maddox; C. A. Jackson; J. Bland-Hawthorn; T. Bridges; R. Cannon; S. Cole; M. Colless; C. Collins; W. Couch; G. Dalton; R. de Propris; S. P. Driver; G. Efstathiou; R. S. Ellis; C. S. Frenk; K. Glazebrook; O. Lahav; I. Lewis; S. Lumsden; J. A. Peacock; B. A. Peterson; W. Sutherland; K. Taylor

2002-02-05T23:59:59.000Z

392

The Structure of Nuclear Star Clusters in Nearby Late-type Spiral Galaxies from Hubble Space Telescope Wide Field Camera 3 Imaging  

E-Print Network [OSTI]

We obtained Hubble Space Telescope/Wide Field Camera 3 imaging of a sample of ten of the nearest and brightest nuclear clusters residing in late-type spiral galaxies, in seven bands that span the near-ultraviolet to the near-infrared. Structural properties of the clusters were measured by fitting two-dimensional surface brightness profiles to the images using GALFIT. The clusters exhibit a wide range of structural properties. For six of the ten clusters in our sample, we find changes in the effective radius with wavelength, suggesting radially varying stellar populations. In four of the objects, the effective radius increases with wavelength, indicating the presence of a younger population which is more concentrated than the bulk of the stars in the cluster. However, we find a general decrease in effective radius with wavelength in two of the objects in our sample, which may indicate extended, circumnuclear star formation. We also find a general trend of increasing roundness of the clusters at longer waveleng...

Carson, Daniel J; Seth, Anil C; Brok, Mark den; Cappelari, Michele; Greene, Jenny E; Ho, Luis C; Neumayer, Nadine

2015-01-01T23:59:59.000Z

393

Development of a Novel Efficient Solid-Oxide Hybrid for Co-generation of Hydrogen and Electricity Using Nearby Resources for Local Application  

SciTech Connect (OSTI)

Developing safe, reliable, cost-effective, and efficient hydrogen-electricity co-generation systems is an important step in the quest for national energy security and minimized reliance on foreign oil. This project aimed to, through materials research, develop a cost-effective advanced technology cogenerating hydrogen and electricity directly from distributed natural gas and/or coal-derived fuels. This advanced technology was built upon a novel hybrid module composed of solid-oxide fuel-assisted electrolysis cells (SOFECs) and solid-oxide fuel cells (SOFCs), both of which were in planar, anode-supported designs. A SOFEC is an electrochemical device, in which an oxidizable fuel and steam are fed to the anode and cathode, respectively. Steam on the cathode is split into oxygen ions that are transported through an oxygen ion-conducting electrolyte (i.e. YSZ) to oxidize the anode fuel. The dissociated hydrogen and residual steam are exhausted from the SOFEC cathode and then separated by condensation of the steam to produce pure hydrogen. The rationale was that in such an approach fuel provides a chemical potential replacing the external power conventionally used to drive electrolysis cells (i.e. solid oxide electrolysis cells). A SOFC is similar to the SOFEC by replacing cathode steam with air for power generation. To fulfill the cogeneration objective, a hybrid module comprising reversible SOFEC stacks and SOFC stacks was designed that planar SOFECs and SOFCs were manifolded in such a way that the anodes of both the SOFCs and the SOFECs were fed the same fuel, (i.e. natural gas or coal-derived fuel). Hydrogen was produced by SOFECs and electricity was generated by SOFCs within the same hybrid system. A stand-alone 5 kW system comprising three SOFEC-SOFC hybrid modules and three dedicated SOFC stacks, balance-of-plant components (including a tailgas-fired steam generator and tailgas-fired process heaters), and electronic controls was designed, though an overall integrated system assembly was not completed because of limited resources. An inexpensive metallic interconnects fabrication process was developed in-house. BOP components were fabricated and evaluated under the forecasted operating conditions. Proof-of-concept demonstration of cogenerating hydrogen and electricity was performed, and demonstrated SOFEC operational stability over 360 hours with no significant degradation. Cost analysis was performed for providing an economic assessment of the cost of hydrogen production using the targeted hybrid technology, and for guiding future research and development.

Tao, Greg, G.; Virkar, Anil, V.; Bandopadhyay, Sukumar; Thangamani, Nithyanantham; Anderson, Harlan, U.; Brow, Richard, K.

2009-06-30T23:59:59.000Z

394

Introduction 5 Mechanism of Irradiation Hardening 5  

E-Print Network [OSTI]

these obstacles either by the Orowan mechanism , in which the dislocations bow out between the obstacles, thermal activation can help in overcoming the energy barrier caused by the obstacles. This thermal

395

Ecological and Geochemical Aspects of Terrestrial Hydrothermal Systems  

E-Print Network [OSTI]

exploitation of nearby geothermal energy resources. Dixieexploitation of nearby geothermal energy resources. In Napachange (USFWS, 2009), geothermal energy development (BLM,

Forrest, Matthew James

397

E-Print Network 3.0 - aircraft hangers Sample Search Results  

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

and its Application. University of Cambridge 23 PLASTIC DISPROPORTIONATE COLLAPSE AT LOST CORNER COLUMNS Summary: of the NIST study are, I suggest, that: Tall buildings...

398

analysis north america: Topics by E-print Network  

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

2002 Environmental Sciences and Ecology Websites Summary: quality as they vary with climate in grass- land ecosystems throughout central North America including tall-grass...

399

E-Print Network 3.0 - acute lymphocytic leukemia Sample Search...  

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

translocations observed in human T-cell acute lymphoblastic leukemia (T-ALL) often... . Armstrong SA, Look AT. Molecular genetics of acute ... Source: Ecole Polytechnique, Centre...

400

E-Print Network 3.0 - acute leukemia experience Sample Search...  

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

translocations observed in human T-cell acute lymphoblastic leukemia (T-ALL) often... . Armstrong SA, Look AT. Molecular genetics of acute ... Source: Ecole Polytechnique, Centre...

Note: This page contains sample records for the topic "tall obstacles nearby" 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

E-Print Network 3.0 - american agalinis orobanchaceae Sample...  

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

main host plant, Centaurea scabiosa L. (com- mon knapweed... (the tall or knapweed broom- rape, Orobanchaceae) is a holoparasite, which mainly infects Centaurea Source:...

402

Wind effects on large-scale buildings and structures : field measurements, wind tunnel tests and numerical prediction.  

E-Print Network [OSTI]

??Modern large-scale buildings and structures, such as super tall buildings and large roof structures, are usually constructed with innovative structural systems and high strength materials;… (more)

Fu, Jiyang (???)

2007-01-01T23:59:59.000Z

403

Department of Mechanical Engineering Spring 2013 Green Towers Vertical Aquaponic Microfarm  

E-Print Network [OSTI]

PENNSTATE Department of Mechanical Engineering Spring 2013 Green Towers Vertical Aquaponic gardens" inside of vertically placed, twenty-foot tall shipping containers. The gardens utilize aquaponic

Demirel, Melik C.

404

PPPO Official Website  

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

120-foot tall electrical towers are brought down simultaneously A 260-ton synchronous condenser is hoisted from atop the electrical switch house A 260-ton synchronous condenser is...

405

E-Print Network 3.0 - aaf Sample Search Results  

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

Theory Laboratory Collection: Computer Technologies and Information Sciences 2 Aerodynamic Admittance Function of Tall Buildings Ahsan Kareemb Summary: , Notre Dame, USA...

406

(DOE/EIS-0285/SA-12): Supplement Analysis for the Transmission...  

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

managers. The subject corridor traverses mountainous terrain mostly owned by large timber companies. During routine patrols, tall, encroaching trees and vegetation issues...

407

UNIVERSITETET I OSLO Det matematisk-naturvitenskapelige fakultet  

E-Print Network [OSTI]

+ 7y antar p°a D? Fmax = 132 Fmax = 140 Fmax = 136 6) Funksjonen f(x) = cax, der c og a er reelle tall

Løw, Erik

408

Manta Wings: Wave Energy Testing Floats to Puget Sound | Department...  

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

approximately 11 feet tall. "Puget Sound has the appropriate scale waves for these test models. It's mimicking a real ocean environment," says Reenst Lesemann, VP of Business...

409

UF in Osnabrck Understanding Engineering in Europe  

E-Print Network [OSTI]

the chance to climb a 100 meter tall wind generator tower! About the Location Osnabrück is located in Lower

Jawitz, James W.

410

announces major commitment: Topics by E-print Network  

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

Renewable Energy Websites Summary: the flexibility to run on numerous biomass feedstocks including wood chips, tall grasses, corn stover (residual biofuels from...

411

(DOE/EIS-0285/SA-11): Supplement Analysis for the Transmission...  

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

and Record of Decision (ROD). Planning Steps 1. Identify facility and the vegetation management need. The work involved will be to clear tall growing vegetation that is...

412

(DOE/EIS-0285/SA-10): Supplement Analysis for the Transmission...  

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

and Record of Decision (ROD). Planning Steps 1. Identify facility and the vegetation management need. The work involved will be to clear tall growing vegetation that is...

413

(DOE/EIS-0285/SA-27): Supplement Analysis for the Transmission...  

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

and Record of Decision (ROD). Planning Steps 1. Identify facility and the vegetation management need. The work involved will be to clear tall growing vegetation that is...

414

Supplement Analysis for the Transmission System Vegetation Management...  

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

and Record of Decision (ROD). Planning Steps 1. Identify facility and the vegetation management need. The work involved will be to clear tall growing vegetation that is...

415

acceptable seismic margin: Topics by E-print Network  

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

to direct mortality of adult grasshoppers and dispersal of individuals from the short, cut vegetation (< 10 cm in height) to surrounding tall grassland due to their need for...

416

CX-005201: Categorical Exclusion Determination | Department of...  

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

Exclusion Determination CX-005201: Categorical Exclusion Determination Tall Tower Wind Energy Monitoring and Numerical Model Validation in Southern Nevada CX(s) Applied: A9,...

417

E-Print Network 3.0 - adhering junctions connecting Sample Search...  

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

S... . P. Benz, and J. E. Bonevich Abstract--The authors have made tall, uniform stacked Josephson junction... bar- rier of our niobium Josephson junctions and obtain working...

418

E-Print Network 3.0 - angiosperm cuscuta australis Sample Search...  

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

Sciences and Ecology 23 Spatially explicit tools to assess invasion risks by Phragmites australis Summary: . australis) is a tall perennial emergent angiosperm that...

419

The Yalahau Regional Wetland Survey: Ancient Maya Land Use in Northern Quintana Roo, Mexico  

E-Print Network [OSTI]

by the common reed (Phragmites australis [Cav. ] Trin. ex.of 4-m tall reeds (Phragmites australis). Surface elevationand common reed (Phragmites australis). Common herbs are the

Leonard, Daniel Ian

2013-01-01T23:59:59.000Z

420

YouProve: Authenticity and Fidelity in Mobile Sensing Peter Gilbert  

E-Print Network [OSTI]

, Egypt, and Libya is difficult. Due to logistical obstacles, govern- ment bans, and reprisals against

Note: This page contains sample records for the topic "tall obstacles nearby" 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

Joint United States-European Union Theoretical and Practical Course on Molecular Approaches for In Situ Biogradation  

SciTech Connect (OSTI)

The Joint United States - European Union Theoretical and Practical Course on Molecular Approaches for in situ Biodegradation was held May 24 through June 7 at The University of Oklahoma. Twenty-four graduate and postgraduate students from both the United States and the European Union attended the course. Nine states and ten European countries were represented. Students were assigned living quarters and laboratory partners to maximize interactions between US and EU participants as well as to mix people with different technical backgrounds together. The students used the latest methods in molecular biology to characterize beneficial microorganisms and genes involved in the biodegradation of pollutants at a nearby landfill as well as an active hydrocarbon-producing site, part of which is undergoing bioremediation. Seminars by distinguished scientists were organized to expose the students to the breadth of the environmental field, including field assay and engineering applications, laboratory scale bioreactors, microbiology, genetics, regulation, pathway analysis, design of recombinant bacteria, and application of the associated techniques to the field. Lectures were given by various OU faculty on the principles behind the techniques to be used in the laboratory. These lectures included troubleshooting hints and encouraged questions and comments from the audience. The laboratory experiments covered chemical, microbiological, and molecular genetic analyses of soils; bioavailability of contaminants; enrichment cultures; gene probing; PCR amplification of known genes and gene families; identification of microbes based traditional and nontraditional approaches, nutritional capabilities, and 16S rRNA sequence; mRNA detection; and enzyme assays. Field trips were made to the USGS landfill field sampling site, and to the Tall Grass Prairie Preserve, a Nature Conservancy site which also featured long-term studies of bioremediation of crude oil and brine spills by one of the Principal Investigators in collaboration with University of Tulsa faculty. The students are expected to bring the methods that they learned back to their laboratories to enrich their own and their colleagues' ability to perform state of the art environmental biotechnology research.

Suflita, Joseph M.; Duncan, Kathleen E.

2010-08-14T23:59:59.000Z

422

A Generalized {ital K} Correction for Type Ia Supernovae: Comparing {ital R}-band Photometry Beyond {ital z=9.2} with B,V, and {ital R}-band Nearby Photometry  

E-Print Network [OSTI]

spectroscopically peculiar supernovae, and to search for anyK Correction for Type Ia Supernovae: Comparing R-bandK Correction for Type Ia Supernovae: Comparing R-band

Goodbar, Ariel

2008-01-01T23:59:59.000Z

423

www.ext.vt.edu Produced by Communications and Marketing, College of Agriculture and Life Sciences,  

E-Print Network [OSTI]

, the primary forage base is endophyte- infected (E+) Kentucky 31 (KY31) tall fescue. Tall fescue sets performance and disorders caused by the presence of the fungal endophyte Neotyphodium coenophialum reduces its-infected. The endophytic fungus produces ergot alkaloids that are toxic to livestock (Ball, Hoveland, and Lacefield 2002

Liskiewicz, Maciej

424

Ecology, 88(1), 2007, pp. 1825 2007 by the Ecological Society of America  

E-Print Network [OSTI]

arundinaceum (tall fescue), hosts a fungal endophyte that is toxic to herbivores. In replicated experimental grasslands, the presence of the endophyte in tall fescue reduced tree abundance and size, altered tree spp.) was 65% higher in plots with the endophyte at the one grassland site where these data were

Rudgers, Jennifer

425

www.ext.vt.edu Produced by Communications and Marketing, College of Agriculture and Life Sciences,  

E-Print Network [OSTI]

In 2003, the cumulative weight gain of steers on Ken- tucky 31 endophyte-free tall fescue (KY31 E-) was more than that of steers on Lakota prairie grass, Ken- tucky 31 endophyte-infected tall fescue (KY31 E

Liskiewicz, Maciej

426

Comparaison des dynamiques d'apparition et de mortalit des organes de ftuque leve,  

E-Print Network [OSTI]

and senescence rates in tall fescue, cocksfoot and lucerne (leaves, tillers and stems). Three forage species (tall fescue, cocksfoot, lucerne) were cultivated without nitrogen and water stress. Rates of leaf in summer and1 in autumn for lucerne). We showed that the average phyllochrones were 83 degree

Paris-Sud XI, Université de

427

Edinburgh Research Explorer Can seasonal and interannual variation in landscape CO2 fluxes  

E-Print Network [OSTI]

Edinburgh Research Explorer Can seasonal and interannual variation in landscape CO2 fluxes be detected by atmospheric observations of CO2 concentrations made at a tall tower? Citation for published in landscape CO2 fluxes be detected by atmospheric observations of CO2 concentrations made at a tall tower

Millar, Andrew J.

428

The use of ?15N to examine past mangrove stand structures  

E-Print Network [OSTI]

using ?13C and ?15N analysis (mean tall ?13C = -28 ‰, mean tall ?15N = 0‰; mean dwarf ?13C = -25‰, mean dwarf ?15N = -10‰), which may also prove useful in examining past mangrove stand structures from sediment cores. 15N label was traced in R. mangle...

Gudeman, Stephanie M.

2009-06-02T23:59:59.000Z

429

The TAL1 complex targets the FBXW7 tumor suppressor by activating miR-223 in human T cell acute lymphoblastic leukemia  

E-Print Network [OSTI]

The oncogenic transcription factor TAL1/SCL is aberrantly expressed in 60% of cases of human T cell acute lymphoblastic leukemia (T-ALL) and initiates T-ALL in mouse models. By performing global microRNA (miRNA) expression ...

Mansour, Marc R.

430

On the hyperplanes arrangements in mixed-integer techniques  

E-Print Network [OSTI]

the obstacles in the best path generation is provided. Other works, like [9], consider ..... a target position while avoiding the randomly distributed obstacles. .... Navigation, and Control Conference, Providence, Rhode Island, USA,. 16-19 August ...

2010-09-28T23:59:59.000Z

431

Branch-and-Lift Algorithm for Global Optimal Control  

E-Print Network [OSTI]

example in controlling a car or a robot in the presence of obstacles, a local solver will typically fail to determine whether passing a given obstacle on the right or ...

2013-07-23T23:59:59.000Z

432

Study on Prompting Mechanism of Energy EFficiency Technology  

Office of Energy Efficiency and Renewable Energy (EERE)

Information on energy efficient technologies, the obstacles surrounding their implementation, and the methods for prompting use of these technologies.

433

Study of the cavitating instability on a grooved Venturi profile  

E-Print Network [OSTI]

, on converging-diverging obstacles or on blades in turbines and propellers is responsible for many issues like

Paris-Sud XI, Université de

434

Figure 12 Vehicle tracking Figure 11 Pedestrian tracking  

E-Print Network [OSTI]

-finders, infra-red obstacle detectors, GPS, Forward Looking Infra-Red (FLIR), microwave, etc. provide other

Brandt, Scott A.

435

Fig. 11 Pedestrian tracking Fig. 12 Vehicle tracking  

E-Print Network [OSTI]

and ultrasonic range-finders, infra-red obstacle detectors, GPS, Forward Looking Infra-Red (FLIR), microwave, etc

Brandt, Scott A.

436

372 IEEE TRANSACTIONS ON SYSTEMS, MAN, AND CYBERNETICS--PART A: SYSTEMS AND HUMANS, VOL. 37, NO. 3, MAY 2007 Decentralized Self-Organizing Potential Field-Based  

E-Print Network [OSTI]

-control of the ith agent. uoi Stationary obstacle avoidance component of ui. ugi PRF component of ui. uci CRF

Masoud, Ahmad A.

437

Final Report: Mobile Surveillance and Wireless Communication Systems Field Operational Test Volume 2: FOT Objectives, Organization, System Design, Results, Conclusions and Recommendations  

E-Print Network [OSTI]

obstacle to using solar power to charge the ramp metersystem do utilize solar power to supplement power supplied

Klein, Lawrence

1999-01-01T23:59:59.000Z

438

Speed Map for Autonomous Rovers over Rough Terrain  

E-Print Network [OSTI]

Grid Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . .considered obstacles [27] Grid Map showing Tile Size, Cellspeed map. It also covers grid maps and terrain roughness,

Loh, Jonathan Edau

2012-01-01T23:59:59.000Z

439

Decision Making of Mobile Robot in the Presence of Risk on Its Surroundings  

E-Print Network [OSTI]

Valle [11]. ........................... 14 8 Graphical representation of map using grid for the wavefront algorithm.. 16 9 Assignment of number with wave expansion. ........................................... 16 10 The shortest path (green cell...?s algorithm. ...................... 42 B-1 Simulation result for 5x5 map size (a) 5% of grid covered with obstacle. (b) 10% of grid covered with obstacle. (c) 20% of grid covered with obstacle. (d) 30% of grid covered with obstacle...

Huh, Sung

2012-02-14T23:59:59.000Z

440

Paul Murdin how we discovered the cosMos  

E-Print Network [OSTI]

galaxies and therefore rather faint. The appearance of a bright, nearby supernova like Tycho Brahe's `new

McReynolds, Ben

Note: This page contains sample records for the topic "tall obstacles nearby" 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

ALDO LEOPOLD: .. . wildlife once fed us and shaped our culture.  

E-Print Network [OSTI]

conduct thinning operations in nearby pine plantations. Fortunately, no calamities have occurred, and Mike

442

2010 INTERNATIONAL CONFERENCE ON INDOOR POSITIONING AND INDOOR NAVIGATION (IPIN), 15-17 SEPTEMBER 2010, ZRICH, SWITZERLAND Self-Localization Application for iPhone  

E-Print Network [OSTI]

noises, coughing of nearby passengers or other sounds which are ubiquitously available. Based on the TDOA

Schindelhauer, Christian

443

EA-1376: Final Environmental Assessment | Department of Energy  

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

at Technical Area 69. The new Center would include a 30,000-square-foot (2,700-square-meter) facility, a garage, a 130-car parking lot, and a 150-foot (45-meter) tall fire...

444

Study of base isolation systems  

E-Print Network [OSTI]

The primary objective of this investigation is to outline the relevant issues concerning the conceptual design of base isolated structures. A 90 feet high, 6 stories tall, moment steel frame structure with tension cross ...

Manarbek, Saruar

2013-01-01T23:59:59.000Z

445

The Theory and Practice of Decoupling  

E-Print Network [OSTI]

Power & Light Western Power & Gas Kentucky Power Kentucky65-88) Otter Tall Power Cincinnati Gas & Electric (65-88)65-80) Arkansas Power & Ught Pacific Gas & Electric San

Eto, J.H.

2010-01-01T23:59:59.000Z

446

Computational wind engineering using finite element package ADINA  

E-Print Network [OSTI]

Design of tall and long span structures is governed by the wind forces. Inadequate research in the field of wind dynamics has forced engineers to rely on design codes or wind tunnel tests for sufficient data. The present ...

Bajoria, Ankur

2008-01-01T23:59:59.000Z

447

No-till seeding of forage grasses and legumes can be suc-cessful and has become an accepted practice for a number of  

E-Print Network [OSTI]

conservation, along with a dramatic reduction in water run-off, improves the water supply for the new seedlings plants from competing with the new seedlings. Heavy thatch and plant growth tall enough to shade the soil

Liskiewicz, Maciej

448

Microsoft Word - Omak-Area-3G-CX.doc  

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

visual value. The new tower at Foster Creek RS is 60' tall and surrounded by similar transmission infrastructure and larger towers, and the EG building at Fox Mt is one of...

449

22 December 2003 2 January 2004 2 Japan, December 2003  

E-Print Network [OSTI]

in spiky heeled boots. This look ­ of the tall, high-heeled boots, together with very short skirts probably survive in the short skirts and boots if he were so inclined). Takashi explains

O'Reilly, Randall C.

450

United States Launches First Grid-Connected Offshore Wind Turbine...  

Energy Savers [EERE]

partners conducted extensive design, engineering, and testing of floating offshore wind turbines, then constructed and deployed its 65-foot-tall VolturnUS prototype. At a scale of...

451

Heterosis and Composition of Sweet Sorghum  

E-Print Network [OSTI]

Sweet sorghum (Sorghum bicolor) has potential as a bioenergy feedstock due to its high yield potential and the production of simple sugars for fermentation. Sweet sorghum cultivars are typically tall, high biomass types with juicy stalks and high...

Corn, Rebecca J.

2011-02-22T23:59:59.000Z

452

Energy Efficiency Evaluation of Guangzhou West Tower Façade System  

E-Print Network [OSTI]

Guangzhou West Tower is an extremely tall public building. The energy efficiency evaluation of its façade should be different than that of ordinary public buildings. Based on the national code GB50189-2005, “Design Standard for Energy efficiency...

Meng, Q.; Zhang, L.

2006-01-01T23:59:59.000Z

453

A study of the molecular mechanics of wood cell walls  

E-Print Network [OSTI]

Wood is the original structural material, developed by nature to support tall plants. Every advantageous feature of wood as used in artificial structures is rooted in the plant's evolved capability to withstand the conditions ...

Adler, David, S.M. (David C.). Massachusetts Institute of Technology

2013-01-01T23:59:59.000Z

454

Rapid Spatial Distribution Seismic Loss Analysis for Multistory Buildings  

E-Print Network [OSTI]

Tall building frames that respond to large seismic ground motions tend to have significant spatial variability of damage over their height, often with a concentration of that damage in the lower stories. In spite of this spatial variability...

Deshmukh, Pankaj Bhagvatrao

2012-07-16T23:59:59.000Z

455

CX-005020: Categorical Exclusion Determination | Department of...  

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

Categorical Exclusion Determination Provision of Funds to the Idaho Department of Fish and Game For Purchase of the Tall Pines Property CX(s) Applied: B1.25 Date: 01052011...

456

Hero Joe  

E-Print Network [OSTI]

who is fiddling with his cell phone. His tall lanky build ishis face away from his cell phone and glares at Joe. JOE (his phone. JOE (CONT’D) Hey, Cell Phone. Put the Blackberry

Carnick, Michael

2012-01-01T23:59:59.000Z

457

Scientists Help Bring Advanced Laser Technologies Mainstream...  

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

difficult-to-work with materials like titanium into parts as large as 1 meter tall. This additive manufacturing technique is being developed to form the leading edge of our jet...

458

A computational approach to the design of free form diagrid structure  

E-Print Network [OSTI]

In order to satisfy the ever-increasing complexity of modem architectural design of tall towers, diagrid structural systems are becoming more relevant. To deal with irregular geometries, more sophisticated computational ...

Sundberg, Jessica Nicole

2009-01-01T23:59:59.000Z

459

by Pat Bailey SOMETIMES IT PAYS TO HAVE WILD AND QUIRKY  

E-Print Network [OSTI]

by on the shorter stretches of daylight that accompany winter. Juggling, heat, light, salt and scarce moisture is a tall order, but scientists are already finding such multifac- eted solutions in the genes of both

Schladow, S. Geoffrey

460

Improving parameterization of scalar transport through vegetation in a coupled ecosystem-atmosphere model  

E-Print Network [OSTI]

Several regional-scale ecosystem models currently parameterize subcanopy scalar transport using a rough-wall boundary eddy diffusivity formulation. This formulation predicts unreasonably high soil evaporation beneath tall, ...

Link, Percy Anne

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "tall obstacles nearby" 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

Propagating Waves Recorded in the Steel, Moment-Frame Factor Building During Earthquakes  

E-Print Network [OSTI]

studies of damage to tall steel moment-frame buildings inan instrumented 15-story steel- frame building, EarthquakePropagating Waves in the Steel, Moment-Frame Factor Building

Kohler, Monica; Heaton, Thomas H.; Samuel C. Bradford

2007-01-01T23:59:59.000Z

462

Glenn Seaborg Trail | U.S. DOE Office of Science (SC)  

Office of Science (SC) Website

| Creek | Tall Tree | Forest Floor | Ferns | Tranquil Spot | Bridge Old Tree A large white oak along the Seaborg Trail that is estimated to date to the 1750's. A study of the...

463

ZFX Controls Propagation and Prevents Differentiation of Acute T-Lymphoblastic and Myeloid Leukemia  

E-Print Network [OSTI]

Tumor-propagating cells in acute leukemia maintain a stem/progenitor-like immature phenotype and proliferative capacity. Acute myeloid leukemia (AML) and acute T-lymphoblastic leukemia (T-ALL) originate from different ...

Weisberg, Stuart P.

464

Lei Zuo, Ph.D., Assistant Professor Department of Mechanical Engineering, State Univ. of New York at Stony Brook, NY 11794-2300  

E-Print Network [OSTI]

Energy Research and Development Authority, PI Lei Zuo, 2011-2012 "Vibration Control of Tall Buildings I: Feasibility Study", $8,332, An industry company and NYS SPIR, PI Lei Zuo, 2010-2011 Honors

Zuo, Lei

465

E-Print Network 3.0 - anethum graveolens foeniculum Sample Search...  

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

L.) production near major population centers in California was found... selected celery plants (Apium graveolens L., vat Tall Utah 52-70) each for control and test fogs were......

466

CX-004550: Categorical Exclusion Determination | Department of...  

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

new football stadium on their campus in the town of Denton (Denton County), Texas. The turbine towers would be 121 feet tall, and with an approximate 35-foot blade length, the...

467

HumanWildlife Interactions 7(2):273298, Fall 2013 Stakeholder contemporary knowledge  

E-Print Network [OSTI]

of tall structures, such as power lines, communication towers, wind turbines, and other installations and development (e.g., power lines, communication towers, wind turbines, and other installations) and associated

468

STRUCTURAL ENGINEERING, MECHANICS AND MATERIALS  

E-Print Network [OSTI]

of companies worldwide; cladding effects on, and hybrid control of, the response of tall buildings Buildings · Masonry Structures · Nano/Microstructure of Cement-based Materials · Polymeric Composite Systems · Reliable Engineering Computing · Risk Analysis · Seismic Hazard Mitigation · Smart Materials

Wang, Yuhang

469

2014 GRADUATE STUDIES STRUCTURAL ENGINEERING,  

E-Print Network [OSTI]

, the response of tall buildings to earthquake and wind; steel connection design and behavior; and structural engineering and mechanics · Advanced Applied Mathematics in Engineering · Advanced Dynamics and Smart Environments · High-performance Concrete and Steel · Horizontally Curved Bridges · Industrial Buildings

Wang, Yuhang

470

Technology and society : some insights on the development of metallurgy in the Southern Levant in the light of new dates of slag deposits  

E-Print Network [OSTI]

Survey and Excavation at Wadi Al- Yutum and Tall Al-Magassthe Ancient Copper Mines of the Wadi Amram (South Arabah).Shiqmim Yotvata Nabataean Wadi Fidan 4 Wadi Fidan 4 Khirbat

Ben-Yosef, Erez

2008-01-01T23:59:59.000Z

471

amerindian pottery figurines: Topics by E-print Network  

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

Topic Index 161 THE URBAN ECOLOGY OF CANNABIS CiteSeer Summary: Cannabis sativa aka, hemp, marijuana, or Indian hemp, et al, is a tall, robust, dioecious annual that grows from...

472

alcohol tobacco cannabis: Topics by E-print Network  

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

unknown authors 20 THE URBAN ECOLOGY OF CANNABIS CiteSeer Summary: Cannabis sativa aka, hemp, marijuana, or Indian hemp, et al, is a tall, robust, dioecious annual that grows from...

473

anthracis bacteriophage-mediated ecological: Topics by E-print...  

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

Bledsoe, Brian 388 THE URBAN ECOLOGY OF CANNABIS CiteSeer Summary: Cannabis sativa aka, hemp, marijuana, or Indian hemp, et al, is a tall, robust, dioecious annual that grows from...

474

Site selection of Henslow's sparrows wintering on the upper Texas Coast  

E-Print Network [OSTI]

The Henslow's sparrow (Ammodramus henslowii) selects wintering sites that consist of damp areas with tall grasses, standing dead weeds and scattered shrubs. The smallest study site, a grassy opening at W.G. Jones State Forest, was approximately .76...

Hannah, Flo

2000-01-01T23:59:59.000Z

475

Supplement Analysis for the Transmission System Vegetation Management...  

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

needed as follow-up to treat misses and any other re-growth from 2-3 years after initial treatment. Noxious weed treatments may be needed at this time. Future cycles - As tall...

476

Siljansfors frskspark Hyggesfritt,bldning,  

E-Print Network [OSTI]

det i våra vanligaste skogstyper? Vem vill ha det? Den 15-17 september reder vi ut be- greppen med tre exkursion till försöksytor i skiktade skogar av tall och gran. 16 september kl. 8:30-16: Internationell gran och fröträdsställning av tall. Europeiska jordbruksfonden för landsbygdsutveckling: Europa

477

Origins of the deflagration-to-detonation transition in gas-phase combustion  

SciTech Connect (OSTI)

This paper summarizes a 10-year theoretical and numerical effort to understand the deflagration-to-detonation transition (DDT). To simulate DDT from first principles, it is necessary to resolve the relevant scales ranging from the size of the system to the flame thickness, a range that can cover up to 12 orders of magnitude in real systems. This computational challenge resulted in the development of numerical algorithms for solving coupled partial and ordinary differential equations and a new method for adaptive mesh refinement to deal with multiscale phenomena. Insight into how, when, and where DDT occurs was obtained by analyzing a series of multidimensional numerical simulations of laboratory experiments designed to create a turbulent flame through a series of shock-flame interactions. The simulations showed that these interactions are important for creating the conditions in which DDT can occur. Flames enhance the strength of shocks passing through a turbulent flame brush and generate new shocks. In turn, shock interactions with flames create and drive the turbulence in flames. The turbulent flame itself does not undergo a transition, but it creates conditions in nearby unreacted material that lead to ignition centers, or 'hot spots,' which can then produce a detonation through the Zeldovich gradient mechanism involving gradients of reactivity. Obstacles and boundary layers, through their interactions with shocks and flames, help to create environments in which hot spots can develop. Other scenarios producing reactivity gradients that can lead to detonations include flame-flame interactions, turbulent mixing of hot products with reactant gases, and direct shock ignition. Major unresolved questions concern the properties of nonequilibrium, shock-driven turbulence, stochastic properties of ignition events, and the possibility of unconfined DDT. (author)

Oran, Elaine S.; Gamezo, Vadim N. [Laboratory for Computational Physics & amp; Fluids Dynamics, US Naval Research Laboratory, Washington, DC 20375 (United States)

2007-01-15T23:59:59.000Z

478

MIT Big Data Challenge: Transportation in the City of Boston Model of Prediction Challenge  

E-Print Network [OSTI]

and for periods before and after the prediction interval. When available, the number of MBTA T rides at nearby

Oliva, Aude

479

nature physics | VOL 4 | FEBRUARY 2008 | www.nature.com/naturephysics 87 research hIGhLIGhTs  

E-Print Network [OSTI]

nearby crystal or erbium ion, by a process known as space- separated quantum cutting. Warp drive Phys

Loss, Daniel

480

Scripps Institution of Oceanography Contributions Index Vols. 1-39, 1938-1969  

E-Print Network [OSTI]

economy of coral reefs, Bikini and nearby atolls, Marshallrefraction studies of Bikini and Kwajalein atolls andin Bikini Lagoon ..••••..••••. •..•. •.••.•. ••

Anonymous,

1970-01-01T23:59:59.000Z

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


481

Sexual isolation and extreme morphological divergence in the Cumana guppy: a possible case of incipient speciation  

E-Print Network [OSTI]

Cumana´, Venezuela, the `Cumana´ guppy', differs significantly in female preferences from a nearby guppy

482

Supplement of Atmos. Chem. Phys., 14, 45734585, 2014 http://www.atmos-chem-phys.net/acp-14-4573-2014/  

E-Print Network [OSTI]

. Hangzhou 8.7 14 13 Residential & commercial area, Construction site nearby, no industrial sources nearby Chemistry and Physics OpenAccess Supplement of Impact of biomass burning on haze pollution in the Yangtze Residential & commercial area, no industrial sources or fugitive dust nearby, 225m south to Liuting Street

Meskhidze, Nicholas

483

Renewable Energy Project Refinement Webinar  

Broader source: Energy.gov [DOE]

Attendees will become familiar with the three components of project refinement: project financing strategies, off-taker agreements, and vendor selection. Project refinement obstacles, particularly...

484

Improving the reliability of wind power through spatially distributed wind generation.  

E-Print Network [OSTI]

??Wind power is a fast-growing, sustainable energy source. However, the problem of wind variability as it relates to wind power reliability is an obstacle to… (more)

Fisher, Samuel Martin

2012-01-01T23:59:59.000Z

485

Real Time Diagnostics for Algae-final-sm  

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

Laboratories is developing a suite of complementary technologies to help the emerging algae industry detect and quickly recover from algal pond crashes, an obstacle to...

486

adoptive cellular immunotherapy: Topics by E-print Network  

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

adoption. In order to overcome these obstacles, we propose that organizations prepare strategies and guidelines for social media adoption and use. unknown authors 217 SMEs'...

487

Press Roundtable with U.S. Energy Secretary Bodman & U.S. Agriculture...  

Energy Savers [EERE]

of nongovernmental organizations. The conference will address areas where government, industry and stakeholders can work together to overcome obstacles to expand our use of...

488

AN EFFICIENT AND STABLE SPECTRAL-ELEMENT METHOD FOR ...  

E-Print Network [OSTI]

harmonic sound waves in a homogeneous compressible fluid by an obstacle is de- veloped in this ... sented to show the accuracy and stability of the method. 1.

2013-08-08T23:59:59.000Z

489

Local Uniqueness for the Fixed Energy Fixed Angle Inverse Problem ...  

E-Print Network [OSTI]

Abstract. We prove local uniqueness for the inverse problem in obstacle scattering at a fixed energy and fixed incident angle. We consider the inverse problem of ...

490

Storming Fortresses: A Political History Of Chess In The Soviet Union, 1917-1948  

E-Print Network [OSTI]

The obstacles erected by the Lucerne Sport International hadwas loosely affiliated: the Lucerne Sport International. Atloosely associated with the Lucerne Sport International, a

Hudson, Michael Andrew

2013-01-01T23:59:59.000Z

491

Shape Reconstruction of Inverse Medium Scattering for the ...  

E-Print Network [OSTI]

The well-posedness of the direct scattering is proved, and important energy. 2 ..... It is essential for the success and efficiency of the inverse obstacle scattering to ...

2011-11-03T23:59:59.000Z

492

E-Print Network 3.0 - animal sonar systems Sample Search Results  

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

and obstacle avoidance system using sonar sequences. c 2000 Academic Press Key Words: subsea vision; video... tracking; sonar tracking. 1. INTRODUCTION 1.1. The Need for Reliable...

493

E-Print Network 3.0 - automatic beam path Sample Search Results  

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

axis paths only... of obstacles is to some extent automat- ically accounted for, as beams are themselves of finite transverse... leads to "automatic" grouping of rays, which...

494

An Act to Implement the Recommendations of the Governor's Ocean Energy Task Force (Maine)  

Broader source: Energy.gov [DOE]

This law was enacted to overcome economic, technical and regulatory obstacles and to provide economic incentives for vigorous and efficient development of promising indigenous, renewable ocean...

495

E-Print Network 3.0 - adipofascial anterolateral thigh Sample...  

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

Coupling ReaxFF with Temperature Accelerated Summary: events Concerted Atom Movement 12;TAD Illustration Thigh 12;Implementation into CMDF Coding Obstacles... Voter's...

496

E-Print Network 3.0 - anterolateral thigh perforator Sample Search...  

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

Coupling ReaxFF with Temperature Accelerated Summary: events Concerted Atom Movement 12;TAD Illustration Thigh 12;Implementation into CMDF Coding Obstacles... Voter's...

497

Measuring and tuning energy efficiency on large scale high performance computing platforms.  

E-Print Network [OSTI]

??Recognition of the importance of power in the field of High Performance Computing, whether it be as an obstacle, expense or design consideration, has never… (more)

Laros, James Howard III

2012-01-01T23:59:59.000Z

498

Symmetry in Scheduling Problems  

E-Print Network [OSTI]

Nov 16, 2010 ... Using operating room and power generator scheduling problems ... Symmetry has been an obstacle in mixed integer linear programming ...

2010-11-16T23:59:59.000Z

499

LWRS AOCC 2014 Milestone Report (DRAFT).docx  

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

you experience obstacles? 7. Communication Efficiency Describe any way that communication efficiency may be improved during outage planning and execution. 69 APPENDIX E: CHANGE...

500

STATEMENT OF CONSIDERATIONS REQUEST BY SOLAREX CORPORATION FOR...  

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

tangible assistance for identifying and overcoming major technical obstacles to improving photovoltaic manufacturing technologies. The scope of work under the above subcontract...