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1

Enhanced Dispersion from Tall Stacks Near Modern Wind Mills  

Science Journals Connector (OSTI)

Dispersion modeling of emissions from tall stacks is often done with regulatory models, based on the Gaussian plume concept. When the plumes of tall stacks are influenced by the turbulence of nearby wind mills, t...

J. J. Erbrink; Luc Verhees

2014-01-01T23:59:59.000Z

2

Tall Genetics  

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

Tall Genetics Tall Genetics Name: kate Location: N/A Country: N/A Date: N/A Question: how do i grow tall? please tell me some advice or exercise. Replies: I'm sorry but there is no exercise for making you taller. You are genetically programmed to be a certain height. That was determined before you were born. There are a few factors that make you NOT reach your genetically programmed height, such as diet and the way your mother took care of herself when she was pregnant. For instance, if you were supposed to be 5'6" and you didn't get the right diet when you were growing ( which you probably still are!) or your mother drank, smoked and had a bad diet while she was pregnant with you, you may not reach 5'6". You might be shorter. But there isn't anything you can do to make yourself TALLER than you were supposed to be. Take heart-you are only 14 and you will probably still grow a little bit. Have you started you period yet? I ask this because girls usually stop growing about a year after their period begins.

3

Tall oil pitch  

Science Journals Connector (OSTI)

n....Undistilled residue from the distillation of crude tall oil. It is generally recognized that tall oil pitches contain some high-boiling esters and neutral...

2007-01-01T23:59:59.000Z

4

Invisible obstacles  

E-Print Network [OSTI]

It is proved that one can choose a control function on an arbitrary small open subset of the boundary of an obstacle so that the total radiation from this obstacle for a fixed direction of the incident plane wave and for a fixed wave number will be as small as one wishes. The obstacle is called "invisible" in this case.

A. G. Ramm

2006-08-14T23:59:59.000Z

5

Tall Corn Ethanol LLC | Open Energy Information  

Open Energy Info (EERE)

Tall Corn Ethanol LLC Tall Corn Ethanol LLC Jump to: navigation, search Name Tall Corn Ethanol LLC Place Coon Rapids, Iowa Zip 50058 Product Farmer owned bioethanol production company which owns a 40m gallon (151.4m litre) bioethanol plant in Coon Rapids, Iowa. References Tall Corn Ethanol LLC[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Tall Corn Ethanol LLC is a company located in Coon Rapids, Iowa . References ↑ "Tall Corn Ethanol LLC" Retrieved from "http://en.openei.org/w/index.php?title=Tall_Corn_Ethanol_LLC&oldid=352015" Categories: Clean Energy Organizations Companies Organizations Stubs What links here Related changes Special pages Printable version Permanent link

6

Microsoft Word - THE EFFECT OF OBSTACLE#4781.doc  

Open Energy Info (EERE)

THE EFFECT OF OBSTACLES CLOSE TO THE ANEMOMETER MAST LOCATED THE EFFECT OF OBSTACLES CLOSE TO THE ANEMOMETER MAST LOCATED ON A BUILDING ON WIND FLOW IN THE WASP MODEL S. K. KHADEM 1 , J. BADGER*, S. M. ULLAH, S. K. ADITYA, H. R. GHOSH & M. HUSSAIN Renewable Energy Research Centre, University of Dhaka, Bangladesh, e-mail: skkhadem@yahoo.com RISO National Laboratory, Wind Energy & Atmospheric Department, Denmark, e-mail: jake.badger@risoe.dk Abstract - Wind Atlas Analysis and Application Program (WAsP) is a powerful software package which is used for wind energy assessment for any location using the data of a nearby location under the same climatic condition. In this work WAsP has been used to predict potential areas of Kutubdia, an Island of Bangladesh, for installation of wind generators. As the mast is on the roof of Bangladesh Meteorological Department (BMD)

7

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

8

Plastic bottles recycled into sails for tall ship  

Science Journals Connector (OSTI)

Plastic bottles recycled into sails for tall ship ... Using new and conventional plastics recycling technology, Du Pont has converted plastic soda bottles (right) and plastic car fenders into 13,000 sq ft of sail for the tall ship HMS Rose (left). ...

LOIS EMBER

1992-07-06T23:59:59.000Z

9

DIFFERENTIAL SOIL IMPEDANCE OBSTACLE DETECTION  

SciTech Connect (OSTI)

This project develops a new and unique obstacle detection sensor for horizontal directional drilling (HDD) equipment. The development of this new technology will greatly improve the reliability and safety of natural gas HDD construction practices. This sensor utilizes a differential soil impedance measurement technique that will be sensitive to the presence of plastic and ceramic, as well as metallic obstacles. The use of HDD equipment has risen significantly in the gas industry because HDD provides a much more cost-effective and less disruptive method for gas pipe installation than older, trenching methods. However, there have been isolated strikes of underground utilities by HDD equipment, which may have been avoided if methods were available to detect other underground obstacles when using HDD systems. GTI advisors from the gas industry have ranked the value of solving the obstacle detection problem as the most important research and development project for GTI to pursue using Federal Energy Regulatory Commission (FERC) funds available through its industry partner, GRI. GTI proposes to develop a prototype down-hole sensor system that is simple and compact. The sensor utilizes an impedance measurement technique that is sensitive to the presence of metallic or nonmetallic objects in the proximity of the HDD head. The system will use a thin film sensor conformal with the drill head. The impedance of the soil will be measured with a low frequency signal injected through the drill head itself. A pair of bridge type impedance sensors, mounted orthogonal to one another, is capacitively coupled to the soil. Inclusions in the soil will cause changes to the sensor balance distinguishable from homogeneous soil. The sensor will provide range and direction data for obstacles near the HDD head. The goal is to provide a simple, robust system that provides the information required to avoid obstacles. This must be done within the size and ruggedness constraints of the HDD equipment. Imaging obstacles is not within the scope of this work, as it would require a more elaborate sensor than is practical within the HDD head.

Maximillian J. Kieba

2002-08-30T23:59:59.000Z

10

Microsoft Word - Tall_Pines_CX.doc  

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

Lee Watts Lee Watts 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.: 1992-061-00 Categorical Exclusion Applied (from Subpart D, 10 C.F.R. Part 1021): B1.25 Transfer, lease, disposition or acquisition of interests in uncontaminated land for habitat preservation or wildlife management, and only associated buildings that support these purposes. Uncontaminated means that there would be no potential for release of substances at a level, or in a form, that would pose a threat to public health or the environment. Location: Township 51 North Range 3 West Section 2 and Township 52 North Range 3 West Section 35, in Kootenai County, Idaho. Parcel is located on the northeastern shore of Hayden

11

Invisible obstacles Mathematics Department, Kansas State University,  

E-Print Network [OSTI]

Invisible obstacles A.G. Ramm Mathematics Department, Kansas State University, Manhattan, KS 66506. The obstacle is called "invisible" in this case. 1 Introduction Consider a bounded domain D Rn , n = 3: wave scattering, inverse problems, invisible obstacles AMS subject classification: 35J05, 35R30, 74J20

12

Regulation of Tall Structures (Indiana) | Department of Energy  

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

Regulation of Tall Structures (Indiana) Regulation of Tall Structures (Indiana) Regulation of Tall Structures (Indiana) < Back Eligibility Agricultural Commercial Construction Fed. Government Fuel Distributor General Public/Consumer Industrial Installer/Contractor Institutional Investor-Owned Utility Local Government Low-Income Residential Multi-Family Residential Municipal/Public Utility Nonprofit Residential Retail Supplier Rural Electric Cooperative Schools State/Provincial Govt Systems Integrator Transportation Tribal Government Utility Savings Category Wind Buying & Making Electricity Program Info State Indiana Program Type Siting and Permitting Provider Indiana Department of Transporation A permit from the Department of Transportation is required for the construction or alteration of any structure higher than 200 feet above

13

Forage production and animal performance from Kenhy tall fescue  

E-Print Network [OSTI]

winter pasture for livestock. Grazing studies with steers indicate that tall fescue can pro- vide adequate cool-season pasture. Riewe et al. (16) at Angleton, Texas developed grazing production curves for Gulf ryegrass and Kentucky 31 tall fescue... are concerned in the animal evaluation of a forage. They indicate how the "put and take" method of grazing can be utilized to evaluate animal performance, carrying capacity of pastures and animal products produced per unit acre of pasture. Additional grazing...

Dorsett, D. J

2012-06-07T23:59:59.000Z

14

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

15

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

16

The Effect of Obstacles Close to the Anemometer Mask located on a Building  

Open Energy Info (EERE)

The Effect of Obstacles Close to the Anemometer Mask located on a Building The Effect of Obstacles Close to the Anemometer Mask located on a Building on Wind Flow in the WAsP Model Dataset Summary Description (Abstract): Wind Atlas Analysis and Application Program (WAsP) is a powerful software package which is used for wind energy assessment for any location using the data of a nearby location under the same climatic condition. In this work WAsP has been used to predict potential areas of Kutubdia, an Island of Bangladesh, for installation of wind generators. As the mast is on the roof of Bangladesh Meteorological Department (BMD) station the hill effect has been introduced. If full heights of obstacles are used the predicted speed for another location becomes high and therefore the height parameter of the obstacles has been adjusted. It appears that those with height below or equal to the slope should not be considered and an obstacle with height greater then the slope should be taken as around h/2 where h is the height above the slope towards the wind direction. The computation shows that the speed difference for one year period between the measured and predicted annual values is 0.3m/s.

17

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

18

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

19

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

20

Potential impacts of proposed EPA tall stack regulations  

SciTech Connect (OSTI)

The history of the US tall stack controversy is traced. The most recent proposals were put forward by the EPA in November 1984. The implications that these hold for the coal and electricity industries are discussed. It is estimated that the cost/ton of SO/sub 2/ removal would be 500 dollars; northern Appalachian coal production would decline substantially; and the increased costs would be borne by electricity users.

Trisko, E.M.

1985-06-01T23:59:59.000Z

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.


21

Are gamma ray bursts nearby?  

Science Journals Connector (OSTI)

The possibility is considered that the intrinsic luminosity function of gamma ray bursters has sufficient scatter that the ln?N?ln?S relation of observed bursts not be dominated by geometric effects favoring large volumes but rather be dominated by nearby intrinsically faint bursts. It is shown that the distribution of bursts on the sky would be very granular with a significant fraction of them coming from the two or three nearest sources. Possible solutions and alternatives are briefly discussed.

David Eichler

1994-01-01T23:59:59.000Z

22

E-Print Network 3.0 - av tall och Sample Search Results  

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

Databases and Resources 3 Sammanfattar aktuell forskning Nr 6, 2005 BJRN BERG PER GUNDERSEN VERNON MEENTEMEYER Summary: vi andelen tall,gran och lvtrd.Vi berk-...

23

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...

24

Opportunities and obstacles in the wholesale power market  

SciTech Connect (OSTI)

This paper describes the following: service opportunities, market center, relationships, and obstacles in the electric power market.

James, L.M. [SRP, Phoenix, AZ (United States)

1996-12-31T23:59:59.000Z

25

Obstacle Detection from IPM and Super-Homography Nicolas SIMOND  

E-Print Network [OSTI]

Detection, obstacle avoidance, etc. The obstacle detection systems can be divided into different groups according to the types of obstacle the system detects, the ranges, the refresh rate, the reliability or not of road markers. In [1], where an exhaustive recent review of the vehicle detection is presented, all

Paris-Sud XI, Université de

26

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

27

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

E-Print Network [OSTI]

tall steel buildings in the 1985 Mexico City earthquake, there has been sustained interest. 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

Krishnan, Swaminathan

28

Seismic Intensity Estimation of Tall Buildings in Earthquake Early Warning System  

E-Print Network [OSTI]

Seismic Intensity Estimation of Tall Buildings in Earthquake Early Warning System M. H. Cheng & T warning system is currently being tested through the California Integrated Seismic Network (CISN) (http: earthquake early warning system, tall buildings, seismic intensity 1. INTRODUCTION In California, United

Greer, Julia R.

29

Lattice Boltzmann simulations of flow past a cylindrical obstacle  

Science Journals Connector (OSTI)

We present lattice Boltzmann simulations of flow past a cylindrical obstacle. ... the Lvy walk model of turbulence in a lattice Boltzmann model. We discuss pressure around the cylinder...

Lukas Wagner; Fernand Hayot

1995-10-01T23:59:59.000Z

30

Obstacle penetrating dynamic radar imaging system  

DOE Patents [OSTI]

An obstacle penetrating dynamic radar imaging system for the detection, tracking, and imaging of an individual, animal, or object comprising a multiplicity of low power ultra wideband radar units that produce a set of return radar signals from the individual, animal, or object, and a processing system for said set of return radar signals for detection, tracking, and imaging of the individual, animal, or object. The system provides a radar video system for detecting and tracking an individual, animal, or object by producing a set of return radar signals from the individual, animal, or object with a multiplicity of low power ultra wideband radar units, and processing said set of return radar signals for detecting and tracking of the individual, animal, or object.

Romero, Carlos E. (Livermore, CA); Zumstein, James E. (Livermore, CA); Chang, John T. (Danville, CA); Leach, Jr.. Richard R. (Castro Valley, CA)

2006-12-12T23:59:59.000Z

31

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

32

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

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

Earthquake Resilient Tall Reinforced Concrete Buildings at Near-Fault Sites Using Base Isolation and Rocking Core Walls.  

E-Print Network [OSTI]

?? This dissertation pursues three main objectives: (1) to investigate the seismic response of tall reinforced concrete core wall buildings, designed following current building codes, (more)

Calugaru, Vladimir

2014-01-01T23:59:59.000Z

35

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

36

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

2012-06-07T23:59:59.000Z

37

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

38

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

39

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

E-Print Network [OSTI]

-field-to-current conversion factors for lightning strikes to tall objects for (1) the initial peak current at the object top. These far-field-to-current conversion factors are needed for proper interpretation of peak currents reported-field-to-current conversion factor for lightning strikes to flat ground based on the transmission line model and (b

Florida, University of

40

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.

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

Performance characteristics of solar air heater with surface mounted obstacles  

Science Journals Connector (OSTI)

Abstract The performance of conventional solar air heaters (SAHs) can be improved by providing obstacles on the heated wall (i.e. on the absorber plate). Experiments have been performed to collect heat transfer and flow-friction data from an air heater duct with delta-shaped obstacles mounted on the absorber surface and having an aspect ratio 6:1 resembling the conditions close to the solar air heaters. This study encompassed for the range of Reynolds number (Re) from 2100 to 30,000, relative obstacle height (e/H) from 0.25 to 0.75, relative obstacle longitudinal pitch (Pl/e) from 3/2 to 11/2, relative obstacle transverse pitch (Pt/b) from 1 to 7/3 and the angle of incidence (?) varied from 30 to 90. The thermo-hydraulic performance characteristics of SAH have been compared with the previous published works and the optimum range of the geometries have been explored for the better performance of such air-heaters compared to the other designs of solar air heaters.

Adisu Bekele; Manish Mishra; Sushanta Dutta

2014-01-01T23:59:59.000Z

42

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

43

Overcoming obstacles against effective solar lighting interventions in South Asia  

Science Journals Connector (OSTI)

Basing on our devised World Banks Design Principles for effective renewable energy projects in developing countries and an in-depth analysis of our two solar lighting projects in Bangladesh and India, this paper explores three key obstacles that constrain poor people from obtaining solar lighting: financial exclusion, weak governance, and passive NGO and customer participation. The low take-up rate has a social and psychological impact. This paper recommends creating easy access to credit, establishing a robust complaint system, and developing strategic partnership to overcome the obstacles.

Sam Wong

2012-01-01T23:59:59.000Z

44

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

45

Catalytic Deoxygenation of Tall Oil Fatty Acids Over a Palladium-Mesoporous Carbon Catalyst: A New Source of Biofuels  

Science Journals Connector (OSTI)

Catalytic deoxygenation of tall oil fatty acids (TOFA) was demonstrated over palladium catalysts supported on mesoporous carbon at 300C using dodecane as a solvent. Maximally 95% selectivity to linear C17 hy...

Bartosz Rozmys?owicz; Pivi Mki-Arvela; Siswati Lestari

2010-09-01T23:59:59.000Z

46

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

47

Lattice Boltzmann aero-acoustics modelling of flow around obstacles  

E-Print Network [OSTI]

Lattice Boltzmann aero-acoustics modelling of flow around obstacles H. Machroukia , D. Ricotb and O using LaBS software which is based on Lattice Boltzmann method. Within the framework of a consortium including industrial companies and academics institutes, LaBS was created around Lattice Boltzmann method

Paris-Sud XI, Université de

48

Opportunities and Obstacles in the Adoption of mHealth  

E-Print Network [OSTI]

#12;C Opportunities and Obstacles in the Adoption of mHealth By Mehran Mehregany, MS, Ph to this technology approach as mHealth, though it also is called wireless health and uHealth (ubiquitous health). mHealth--for health services and information.1,2 An important but subtle point is that not all mHealth solutions

Rollins, Andrew M.

49

Berkeley Lab: Nearby Short-Term Accommodations  

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

Accommodations Accommodations Visitor Information Maps and Directions to the Lab Offsite Shuttle Bus Service Bay Area Mass Transit Information Site Access Parking Permits and Gate Passes UC Berkeley Campus Map Nearby Short-Term Accommodations Guest House Berkeley Lab Guest House - The Berkeley Lab guest house is conveniently located on the Lawrence Berkeley National Laboratory campus and features 57 tastefully appointed guest rooms, many with spectacular views of the San Francisco bay, skyline, and City of Berkeley. The guest house is only a few minutes away from the University of California Berkeley Campus and the dynamic Berkeley community itself. It is available to visiting researchers and those conducting business with the University. The Faculty Club * U.C. Campus

50

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

51

Ann. Polon. Math., 90, N2, (2007), 145-148. Invisible obstacles  

E-Print Network [OSTI]

Ann. Polon. Math., 90, N2, (2007), 145-148. 1 #12;Invisible obstacles A.G. Ramm Mathematics number will be as small as one wishes. The obstacle is called "invisible" in this case. 1 Introduction ([1]). key words: wave scattering, inverse problems, invisible obstacles AMS subject classification

52

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

53

Chapter 4 - Obstacles to Implementation of Black Liquor Gasification  

Science Journals Connector (OSTI)

Obstacles hindering the commercialization of black liquor gasification are discussed. The most important of them include financial risks, protection of the gasifier, increase in the causticizing demand, tar condensation, hot gas cleanup, and steam deficit. Gasification system demands significant capital investment. The high temperature and pressure and the alkaline conditions create aggressive environment. Protection from an aggressive environment is very important in the operation of a gasifier because it determines the lifetime and hence the feasibility of gasification as a technology as a whole.

Pratima Bajpai

2014-01-01T23:59:59.000Z

54

Design Based on a Shared Lookup-Table for an Obstacle Avoidance Fuzzy Controller for Mobile Robots  

Science Journals Connector (OSTI)

Fuzzy algorithms provide intuitive method for robot obstacle avoidance. Fuzzy controllers incorporating a design based on lookup tables (LUT) enable faster obstacle avoidance in environment with multiple obstacles. In an earlier study, we introduced ... Keywords: robot navigation, obstacle avoidance, fuzzy controller, lookup table

Jinwook Kim; Yoon-Gu Kim; Young-Duk Kim; Won-Seok Kang; Jinung An

2009-11-01T23:59:59.000Z

55

Application of the antenna theory model to a tall tower struck by Behzad Kordi,1,2  

E-Print Network [OSTI]

on the lightning flash parameters. However, the presence of a vertically extended and grounded strike objectApplication of the antenna theory model to a tall tower struck by lightning Behzad Kordi,1] The interaction of lightning with the 553-m high CN Tower in Toronto is modeled using the antenna theory model

Florida, University of

56

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

57

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

58

Parallel Computations of Natural Convection Flow in a Tall Cavity Using an Explicit Finite Element Method  

SciTech Connect (OSTI)

The Galerkin Finite Element Method was used to predict a natural convection flow in an enclosed cavity. The problem considered was a differentially heated, tall (8:1), rectangular cavity with a Rayleigh number of 3.4 x 10{sup 5} and Prandtl number of 0.71. The incompressible Navier-Stokes equations were solved using a Boussinesq approximation for the buoyancy force. The algorithm was developed for efficient use on massively parallel computer systems. Emphasis was on time-accurate simulations. It was found that the average temperature and velocity values can be captured with a relatively coarse grid, while the oscillation amplitude and period appear to be grid sensitive and require a refined computation.

Dunn, T.A.; McCallen, R.C.

2000-10-17T23:59:59.000Z

59

Different approximations of shallow fluid flow over an obstacle  

SciTech Connect (OSTI)

Three different sets of shallow water equations, representing different levels of approximation are considered. The numerical solutions of these different equations for flow past bottom topography in several different flow regimes are compared. For several cases the full Euler solutions are computed as a reference, allowing the assessment of the relative accuracies of the different approximations. Further, the differences between the dispersive shallow water (DSW) solutions and those of the highly simplified, hyperbolic shallow water (SW) equations is studied as a guide to determining what level of approximation is required for a particular flow. First, the Green-Naghdi (GN) equations are derived as a vertically-integrated rational approximation of the Euler equations, and then the generalized Boussinesq (gB) equations are obtained under the further assumption of weak nonlinearity. A series of calculations, each assuming different values of a set of parameters{emdash}undisturbed upstream Froude number, and the height and width of the obstacle, are then presented and discussed. In almost all regions of the parameter space, the SW and DSW theories yield different results; it is only when the flows are entirely subcritical or entirely supercritical and when the obstacles are very wide compared to the depth of the fluid that the SW and DSW theories are in qualitative and quantitative agreement. It is also found that while the gB solutions are accurate only for small bottom topographies (less than 20{percent} of the undisturbed fluid depth), the GN solutions are accurate for much larger topographies (up to 65{percent} of the undisturbed fluid depth). The limitation of the gB approximation to small topographies is primarily due to the generation of large amplitude upstream propagating solitary waves at transcritical Froude numbers, and is consistent with previous analysis. (Abstract Truncated)

Nadiga, B.T.; Margolin, L.G. [Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)] [Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States); Smolarkiewicz, P.K. [National Center for Atmospheric Research, Boulder, Colorado 80307 (United States)] [National Center for Atmospheric Research, Boulder, Colorado 80307 (United States)

1996-08-01T23:59:59.000Z

60

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

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

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 that can be later customized for a specific task. When developers invoke API methods in a framework, they often encounter obstacles in finding the correct usage of the API, let alone to employ best practices

Godfrey, Michael W.

62

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.

63

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

64

Influence of canopy structure on tall fescue cultivar susceptibility to brown patch disease  

Science Journals Connector (OSTI)

Tall fescue (Festuca aurundinacea) cultivars were evaluated under growth chamber and field conditions for susceptibility to brown patch disease caused by Rhizoctonia solani. Percentage foliar necrosis varied among cultivars in growth chamber experiments. Kentucky-31 was the least susceptible cultivar (cv.), sustaining <25% necrosis 6 days after inoculation with the pathogen. Severity of necrosis in other cvs under the same conditions was as high as 88%. Brown patch disease development in the field was lowest in cv. Kentucky-31 among nine cvs evaluated over two years. Average blight severity in cv. Kentucky-31 in 1991 was 34%, compared with 60% in the most susceptible cv., Trailblazer. Similarly in 1992, cvs Kentucky-31 and Trailblazer had the lowest and highest levels, respectively, of brown patch lesion development. Leaf blade density and verdure in the field varied among the cvs. Blade density and verdure correlated (r = 0.78 and 0.68, respectively; p < 0.05) with the extent of lesions measured in 1992, but were not related to mean blight severity measured in 1991. Field disease levels observed in both years had low correlations (r = 0.59; p = 0.10) with levels of necrosis measured in the growth chamber.

Gary Y. Yuen; Loren J. Giesler; Garald L. Horst

1994-01-01T23:59:59.000Z

65

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

66

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

67

Analytical framework for the smooth manoeuvre of wheeled mobile robots traversing obstacles  

Science Journals Connector (OSTI)

...the smooth manoeuvre of wheeled mobile robots traversing obstacles S. O. Oyadiji...model the dynamics of wheeled mobile robots (WMRs), which need to travel...characteristics of a traction surface. mobile robots|temporal trajectory|traction...

2005-01-01T23:59:59.000Z

68

Real-Time Obstacle and Collision Avoidance System for Fixed-Wing Unmanned Aerial Systems  

E-Print Network [OSTI]

. The resulting geometry is then processed through a vertical trapezoidal decomposition where for each vertex defining a contour a vertical line is drawn, and the results of this decomposition is a set of trapezoidal cells. The cells corresponding to obstacle...

Esposito, Julien Florian

2013-08-31T23:59:59.000Z

69

Energy for all: Obstacles and success conditions for RE in developing countries  

Science Journals Connector (OSTI)

In many developing countries there is a much larger potential for renewables like wind and solar energy than in industrialised countries. But there are obstacles that prevent the adoption of such new renewables in developing countries. Ulrich Laumanns and Danyel Reiche try to identify the most important obstacles and point to success conditions that can lead to a wider dissemination of new renewables in developing countries.

Ulrich Laumanns; Danyel Reiche

2004-01-01T23:59:59.000Z

70

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

E-Print Network [OSTI]

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... of the requirements for the degree of MASTER OF SCIENCE May, 19b0 Major Subject: Economics SOME OBSTACLES TO UNITED STATES DIRECT PRIVATE FOREIGN INVESTMENT IN MANUFACTURING: 1950-1958 A Thesis By Milton Dudley Stewart, Jr. Approved as to style and content by...

Stewart, Milton Dudley

2012-06-07T23:59:59.000Z

71

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

72

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

73

The Neutral ISM in Nearby Luminous Compact Blue Galaxies  

E-Print Network [OSTI]

We observed 20 nearby Luminous Compact Blue Galaxies (LCBGs) in HI and CO(J=2-1) with the GBT and JCMT. These ~L^star galaxies are blue, high surface brightness, starbursting, high metallicity galaxies with an underlying older stellar population. They are common at z~1, but rare in the local Universe. It has been proposed that intermediate redshift LCBGs may be the progenitors of local dwarf ellipticals or low luminosity spirals, or that they may be more massive disks forming from the center outward to become L^star galaxies. To discriminate among various possible evolutionary scenarios, we have measured the dynamical masses and gas depletion time scales of this sample of nearby LCBGs. We find that local LCBGs span a wide range of dynamical masses, from 4 x 10^9 to 1 x 10^11 M_solar (measured within R_25). Molecular gas in local LCBGs is depleted quite quickly, in 30 to 200 million years. The molecular plus atomic gas is depleted in 30 million to 10 billion years; however, ~80% of the local LCBGs deplete their gas in less than 5 billion years. As LCBGs are heterogeneous in both dynamical mass and gas depletion time scales, they are not likely to evolve into one homogeneous galaxy class.

C. A. Garland; D. J. Pisano; J. P. Williams; R. Guzman; F. J. Castander

2003-10-30T23:59:59.000Z

74

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

75

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

76

Mid infrared emission of nearby Herbig Ae/Be stars  

E-Print Network [OSTI]

We present mid IR spectro-photometric imaging of a sample of eight nearby ($D \\leq 240$pc) Herbig Ae/Be stars. The spectra are dominated by photospheric emission (HR6000), featureless infrared excess emission (T~Cha), broad silicate emission feature (HR5999) and the infrared emission bands (HD 97048, HD 97300, TY~CrA, HD 176386). The spectrum of HD179218 shows both silicate emission and infrared emission bands (IEB). All stars of our sample where the spectrum is entirely dominated by IEB have an extended emission on scales of a few thousand AU ($\\sim 10''$). We verify the derived source extension found with ISOCAM by multi--aperture photometry with ISOPHT and compare our ISOCAM spectral photometry with ISOSWS spectra.

R. Siebenmorgen; T. Prusti; A. Natta; Th. Mueller

2000-06-26T23:59:59.000Z

77

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

E-Print Network [OSTI]

Releases of silane into air and the effects of obstacles were modeled with the Computational Fluid Dynamics (CFD) code, FLUENT. First the CFD code simulated the release of a free turbulent jet of silane into air to assure that the code agreed...

Sposato, Christina F

2012-06-07T23:59:59.000Z

78

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"

79

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

80

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.

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

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

82

THE DE GIORGI MEASURE AND AN OBSTACLE PROBLEM RELATED TO MINIMAL SURFACES IN  

E-Print Network [OSTI]

THE DE GIORGI MEASURE AND AN OBSTACLE PROBLEM RELATED TO MINIMAL SURFACES IN METRIC SPACES JUHA of a set with minimal perime- ter that separates two disjoint sets in a metric measure space equipped with a doubling measure and supporting a Poincar´e in- equality. A measure constructed by De Giorgi is used

Kinnunen, Juha

83

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

84

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

85

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.

86

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

87

Reciprocal Collision Avoidance for Quadrotor Helicopters using LQR-Obstacles Daman F. Bareiss and Jur van den Berg  

E-Print Network [OSTI]

and Jur van den Berg University of Utah (e-mail: daman.bareiss@utah.edu, berg@cs.utah.edu) Abstract-Obstacles (van den Berg et al. 2012), an exten- sion of Velocity Obstacles (Fiorini and Shiller 1998), which

van den Berg, Jur

88

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

89

Development of an Integrated Sensor System for Obstacle Detection and Terrain Evaluation for Application to Unmanned Ground  

E-Print Network [OSTI]

Development of an Integrated Sensor System for Obstacle Detection and Terrain Evaluation into a 2D space. The second obstacle detection sensor was a stereo vision system that was manufactured of the vehicle. Monocular cameras and vision processing algorithms were used as the second sensor system

Florida, University of

90

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.

91

A catalog of digital images of 113 nearby galaxies  

E-Print Network [OSTI]

We present a digital catalog of images of 113 galaxies in this paper. These galaxies are all nearby, bright, large and well resolved. All images were recorded with charge coupled devices (CCDs) at the Palomar Observatory with the 1.5 meter telescope and at the Lowell Observatory with the 1.1 meter telescope. At Palomar we used the Thuan--Gunn g, r and i photometric bands to take 3 images each of 31 spiral galaxies; at Lowell we used the B_J and R bands (2 images per galaxy) of the photometric system by Gullixson et al. (1995) to observe 82 spirals and ellipticals. The galaxies were selected to span the Hubble classification classes. All data are photometrically calibrated with foreground stars removed. Important data on these galaxies published in the "Third Reference Catalog of Bright Galaxies" (RC3) are recorded in the FITS file headers. All files are available through anonymous FTP from ftp://astro.princeton.edu/, through WWW at http://astro.princeton.edu/~frei/galaxy_catalog.html, and Princeton University...

Frei, Z; Gunn, J E; Tyson, J A; Frei, Zsolt; Guhathakurta, Puragra; Gunn, James E; Tyson, J Anthony

1995-01-01T23:59:59.000Z

92

A Catalog of Digital Images of 113 Nearby Galaxies  

E-Print Network [OSTI]

We present a digital catalog of images of 113 galaxies in this paper. These galaxies are all nearby, bright, large and well resolved. All images were recorded with charge coupled devices (CCDs) at the Palomar Observatory with the 1.5 meter telescope and at the Lowell Observatory with the 1.1 meter telescope. At Palomar we used the Thuan--Gunn g, r and i photometric bands to take 3 images each of 31 spiral galaxies; at Lowell we used the B_J and R bands (2 images per galaxy) of the photometric system by Gullixson et al. (1995) to observe 82 spirals and ellipticals. The galaxies were selected to span the Hubble classification classes. All data are photometrically calibrated with foreground stars removed. Important data on these galaxies published in the "Third Reference Catalog of Bright Galaxies" (RC3) are recorded in the FITS file headers. All files are available through anonymous FTP from ftp://astro.princeton.edu/, through WWW at http://astro.princeton.edu/~frei/galaxy_catalog.html, and Princeton University Press will soon publish the data on CD-ROM.

Zsolt Frei; Puragra Guhathakurta; James E. Gunn; J. Anthony Tyson

1995-10-11T23:59:59.000Z

93

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, Stphane; Moustakas, John; Di Paola, Andrea; Pogge, Richard W; Ragazzoni, Roberto

2012-01-01T23:59:59.000Z

94

Experimental energy and exergy analysis of a double-flow solar air heater having different obstacles on absorber plates  

Science Journals Connector (OSTI)

This paper presents an experimental energy and exergy analysis for a novel flat plate solar air heater (SAH) with several obstacles and without obstacles. For increasing the available heat-transfer area may be achieved if air is flowing simultaneously and separately over and under the different obstacle absorbing plates, instead of only flowing either over or under the different obstacle absorbing plates, leading to improved collector efficiency. The measured parameters were the inlet and outlet temperatures, the absorbing plate temperatures, the ambient temperature, and the solar radiation. Further, the measurements were performed at different values of mass flow rate of air and different levels of absorbing plates in flow channel duct. After the analysis of the results, the optimal value of efficiency is middle level of absorbing plate in flow channel duct for all operating conditions and the double-flow collector supplied with obstacles appears significantly better than that without obstacles. At the end of this study, the exergy relations are delivered for different SAHs. The results show that the largest irreversibility is occurring at the flat plate (without obstacles) collector in which collector efficiency is smallest.

Hikmet Esen

2008-01-01T23:59:59.000Z

95

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

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

First-Generation Risk Profiles Help Predict CO2 Storage Site First-Generation Risk Profiles Help Predict CO2 Storage Site Obstacles First-Generation Risk Profiles Help Predict CO2 Storage Site Obstacles September 18, 2012 - 1:00pm Addthis Washington, DC - In support of large-scale carbon capture, utilization and storage (CCUS) projects, a collaboration of five U.S. Department of Energy (DOE) national laboratories has completed first-generation risk profiles that, for the first time, offer a means to predict the probability of complications that could arise from specific carbon dioxide (CO2) storage sites. With their detailed methodology for quantifying risk potential at underground carbon storage sites, the profiles will help support safe, large-scale CCUS projects, an important option in the effort to reduce human-generated CO2 emissions linked by many experts to global climate

96

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.

Lo-Paul Euv; Florent Michel; Renaud Parentani; Germain Rousseaux

2015-02-06T23:59:59.000Z

97

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.

Euv, Lo-Paul; Parentani, Renaud; Rousseaux, Germain

2014-01-01T23:59:59.000Z

98

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

99

Properties of random component of longitudinal road profile influenced by local obstacles  

Science Journals Connector (OSTI)

This paper describes the statistical properties of the pure random component of longitudinal road profile. The individual obstacles were removed from the road profile by median filtering approach. A total of 25,830 test sections records from the long-term pavement performance (LTPP) programme were analysed. The differences between asphalt concrete (AC) and cement concrete (CC) wearing courses were outlined. The comparison was shown on statistics (mean, median, standard deviation values) and probability density functions (PDFs) of contemporary used road indices (international roughness index (IRI), road elevation variance, power spectrum density (PSD) parameters in one-, two- and three-wavelength bands, etc.). The simulation study revealed the marked influence of obstacles on the road indices. The spectral properties of the pure random part were quantified.

Peter Mucka; Oldrich Kropac

2009-01-01T23:59:59.000Z

100

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.

Lo-Paul Euv; Florent Michel; Renaud Parentani; Germain Rousseaux

2014-09-12T23:59:59.000Z

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.


101

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

SciTech Connect (OSTI)

The legal and institutional obstacles to the development of small-scale hydroelectric energy at the state level are described. The Federal government also exercises extensive regulatory authority in the area. The introductory section examines 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 the hydroelectric development, and concludes with an inquiry into the practical use of the doctrine by the FERC. The first obstacle which every developer in Illinois must confront is obtaining authority to utilize the river bed, banks, and flowing water at the proposed site. This involves 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. Illinois follows the riparian theory of water law. Following the detailed discussion of the water law, direct and indirect regulations and financial considerations are discussed.

None,

1980-05-01T23:59:59.000Z

102

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

103

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

104

Reciprocal Collision Avoidance with Acceleration-Velocity Obstacles Jur van den Berg Jamie Snape Stephen J. Guy Dinesh Manocha  

E-Print Network [OSTI]

Reciprocal Collision Avoidance with Acceleration-Velocity Obstacles Jur van den Berg Jamie Snape at Chapel Hill, USA. E-mail: {berg, snape, sjguy, dm}@cs.unc.edu. Website with videos: http

van den Berg, Jur

105

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

106

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...

107

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

108

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.

Hamadne, Said

2011-01-01T23:59:59.000Z

109

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

110

A perturbative technique to compute scattering of interface waves from pointlike obstacles  

Science Journals Connector (OSTI)

A technique is presented to compute a scattering amplitude for waves from a pointlike inhomogeneity in an elastic medium with boundary into interface as well as bulk modes. The particular system considered is a half?space of fluid overlying a half?space of a liner elastic solid with the obstacle placed in the solid very near the boundary. The object of the calculation is to construct a perturbation theory in layered media in which the scattered wave respects the boundary conditions at each perturbative order. This can then be used to estimate and qualitatively analyze the significant features of such scattering and to produce a well?defined yet simple algorithm for approximating exact solutions. [Work supported by the U.S. Navy Office of Naval Research.

Eric Smith

1995-01-01T23:59:59.000Z

111

Correlation of the highest energy cosmic rays with nearby extragalactic objects  

E-Print Network [OSTI]

Correlation of the highest energy cosmic rays with nearby extragalactic objects The Pierre Auger Collaboration Observatorio Pierre Auger, Avenida San Mart´in Norte 304, (5613) Malarg¨ue, Mendoza, Argentina a correlation between the arrival directions of cosmic rays with energy above 6 ? 1019 electron volts

112

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

113

Energy and exergy analysis of a new flat-plate solar air heater having different obstacles on absorber plates  

Science Journals Connector (OSTI)

This study experimentally investigates performance analysis of a new flat-plate solar air heater (SAH) with several obstacles (Type I, Type II, Type III) and without obstacles (Type IV). Experiments were performed for two air mass flow rates of 0.0074 and 0.0052kg/s. The first and second laws of efficiencies were determined for \\{SAHs\\} and comparisons were made among them. The values of first law efficiency varied between 20% and 82%. The values of second law efficiency changed from 8.32% to 44.00%. The highest efficiency were determined for the SAH with Type II absorbent plate in flow channel duct for all operating conditions, whereas the lowest values were obtained for the SAH without obstacles (Type IV). The results showed that the efficiency of the solar air collectors depends significantly on the solar radiation, surface geometry of the collectors and extension of the air flow line. The largest irreversibility was occurring at the SAH without obstacles (Type IV) collector in which collector efficiency is smallest. At the end of this study, the energy and exergy relationships are delivered for different SAHs.

Ebru Kavak Akpinar; Fatih Koyi?it

2010-01-01T23:59:59.000Z

114

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

115

Obstacle Avoidance and Safeguarding for a Lunar Rover Reid Simmons, Lars Henriksen, Lonnie Chrisman and Greg Whelan  

E-Print Network [OSTI]

Obstacle Avoidance and Safeguarding for a Lunar Rover Reid Simmons, Lars Henriksen, Lonnie Chrisman 15213 Abstract We are developing techniques for safeguarding the remote operation of lunar rovers and dependably. The idea, which we call "safeguarded teleoperation," [9] is to let the humans guide the rover

Simmons, Reid

116

A new laser-based system for obstacle detection including step, hole and slope for Personal Mobility Vehicles  

E-Print Network [OSTI]

A new laser-based system for obstacle detection including step, hole and slope for Personal, and with standard chair wheels difficult. In this paper, we present a step and curb detection system based on laser sensors. This system is dedicated to vehicles able to cross over steps, for transportation systems

Paris-Sud XI, Université de

117

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

118

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

119

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

120

Review of renewable energy industry in Beijing: Development status, obstacles and proposals  

Science Journals Connector (OSTI)

Abstract Beijing is the capital of China, serving as the center of Chinas politics, culture and education. The exploitation and utilization of renewable energy has become an important developmental carrier for Beijing, which is also a key channel for optimizing energy consumption structure, building a high-efficiency and low-carbon energy system, relieving the environmental pressure and ensuring the energy secure of Beijing. In this paper, Beijings renewable energy industry was analyzed. First, Beijings renewable energy resources, which include biomass energy, solar energy, geothermal energy, wind energy and hydro energy, were introduced from two aspects of energy resource distribution and energy resource utilization. Second, the development status of Beijings renewable energy industry (including biomass, solar and wind energy industry) was expounded. Then, the obstacles of Beijings renewable energy industry were analyzed. Finally, some proposals for the healthy development of Beijings renewable energy industry were put forward, which will contribute to build a clean, safe, efficient and low-carbon energy system for Beijing.

Hongze Li; Sen Guo; Liuyang Cui; Jiaojiao Yan; Jiaojiao Liu; Bao Wang

2015-01-01T23:59:59.000Z

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.


121

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

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 authority 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 first step the small scale hydroelectric developer must take is that of acquiring title to the real property comprising the development site. The real estate parcel must include the requisite interest in the land adjacent to the watercourse, access to the underlying streambed and where needed, the land necessary for an upstream impoundment area. Land acquisition may be effectuated by purchase, lease, or grant by the state. In addition to these methods, New York permits the use of the eminent domain power of the state for public utilities under certain circumstances.

None,

1980-05-01T23:59:59.000Z

122

Near zero energy islands in the Mediterranean: Supporting policies and local obstacles  

Science Journals Connector (OSTI)

Abstract Based on a recent technicaleconomical analysis on the island of Pantelleria, a policy feasibility study for a complete upgrading of the energy system of this Mediterranean Island is carried out. Pantelleria, situated between Sicily and Africa, owns a large potential in terms of renewable energy resources, although there are some obstacles in turning it into a Near Zero Energy system. Starting from a deep energy system audit, the study proposes the project for a near zero energy island, through the efficient transformation of the different existing natural energy resources into electrical energy and heat: the solar, the wind-based and the geothermal systems. In this way, the island can be turned into an almost autonomous system. The main difficulties connected to the implementation of the project can be identified in the national energy policies as well as in the specific local situation, characterized by a strong private monopole on generation and distribution of electrical energy which has no incentive for supporting the costs connected to the energy requalification of the island. On the other hand, the local administrations, involved in the project through bottom-up European policies, do not have the cultural and economic tools to go on with the implementation.

Eleonora Riva Sanseverino; Raffaella Riva Sanseverino; Salvatore Favuzza; Valentina Vaccaro

2014-01-01T23:59:59.000Z

123

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

SciTech Connect (OSTI)

The legal and institutional obstacles to the development of small-scale hydroelectric energy at the state level in Maryland are described. The Federal government also exercises extensive regulatory authority in the area. The dual regulatory system is examined with the aim of creating a more orderly understanding of the vagaries of the system, focusing on 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. In Maryland, by common law rule, title to all navigable waters and to the soil below the high-water mark of those waters is vested in the state as successor to the Lord Proprietary who had received it by grant from the Crown. Rights to non-navigable water, public trust doctrine, and eminent domain are also discussed. Direct and indirect regulations, continuing obligations, loan programs, and regional organizations are described in additional sections.

None,

1980-05-01T23:59:59.000Z

124

Miller's instability, microchaos and the short-term evolution of initially nearby orbits  

E-Print Network [OSTI]

We study the phase-space behaviour of nearby trajectories in integrable potentials. We show that the separation of nearby orbits initially diverges very fast, mimicking a nearly exponential behaviour, while at late times it grows linearly. This initial exponential phase, known as Miller's instability, is commonly found in N-body simulations, and has been attributed to short-term (microscopic) N-body chaos. However we show here analytically that the initial divergence is simply due to the shape of an orbit in phase-space. This result confirms previous suspicions that this transient phenomenon is not related to an instability in the sense of non-integrable behaviour in the dynamics of N-body systems.

Amina Helmi; Facundo Gomez

2007-10-02T23:59:59.000Z

125

Identifying Nearby, Young, Late-type Stars by Means of Their Circumstellar Disks  

E-Print Network [OSTI]

It has recently been shown that a significant fraction of late-type members of nearby, very young associations (age excess emission at mid-IR wavelengths indicative of dusty circumstellar disks. We demonstrate that the detection of mid-IR excess emission can be utilized to identify new nearby, young, late-type stars including two definite new members ("TWA 33" and "TWA 34") of the TW Hydrae Association. Both new TWA members display mid-IR excess emission in the Wide-field Infrared Survey Explorer (WISE) catalog and they show proper motion and youthful spectroscopic characteristics -- namely H\\alpha emission, strong lithium absorption, and low surface gravity features consistent with known TWA members. We also detect mid-IR excess -- the first unambiguous evidence of a dusty circumstellar disk -- around a previously identified UV-bright, young, accreting star (2M1337) that is a likely member of the Lower-Centaurus Crux region of the Scorpius Centaurus Complex.

Schneider, Adam; Melis, Carl; Zuckerman, Ben; Bessell, Mike

2012-01-01T23:59:59.000Z

126

RECIPIENT:Desert Research Institute STATE:NV PROJECT Tall Tower Wind Energy Monitoring and Numerical Model Validation in Southern Nevada; NREl Tracking  

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

Desert Research Institute STATE:NV Desert Research Institute STATE:NV PROJECT Tall Tower Wind Energy Monitoring and Numerical Model Validation in Southern Nevada; NREl Tracking TITLE: No. 11-012 Funding Opportunity Announcement Number Procurement Instrument Number NEPA Control Number CID Number NREl-11-012 G010337 Based on my review of the information concerning the proposed action, as NEPA CompHance Officer (authorized under DOE Order 451.1A), I have made the following determination: CX, EA, EIS APPENDIX AND NUMBER: Description: A9 Information gathering (including, but not limited to, literature surveys, inventories, audits), data analYSis (including computer modeling), document preparation (such as conceptual deSign or feasibility studies, analytical energy supply and demand studies), and dissemination (including, but not limited to, document mailings, publication, and distribution;

127

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

128

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

129

The Practical Obstacles of Data Transfer: Why researchers still love scp  

SciTech Connect (OSTI)

The importance of computing facilities is heralded every six months with the announcement of the new Top500 list, showcasing the world s fastest supercomputers. Unfortu- nately, with great computing capability does not come great long-term data storage capacity, which often means users must move their data to their local site archive, to remote sites where they may be doing future computation or anal- ysis, or back to their home institution, else face the dreaded data purge that most HPC centers employ to keep utiliza- tion of large parallel filesystems low to manage performance and capacity. At HPC centers, data transfer is crucial to the scientific workflow and will increase in importance as computing systems grow in size. The Energy Sciences Net- work (ESnet) recently launched its fifth generation network, a 100 Gbps high-performance, unclassified national network connecting more than 40 DOE research sites to support scientific research and collaboration. Despite the tenfold increase in bandwidth to DOE research sites amenable to multiple data transfer streams and high throughput, in prac- tice, researchers often under-utilize the network and resort to painfully-slow single stream transfer methods such as scp to avoid the complexity of using multiple stream tools such as GridFTP and bbcp, and contend with frustration from the lack of consistency of available tools between sites. In this study we survey and assess the data transfer methods pro- vided at several DOE supported computing facilities, includ- ing both leadership-computing facilities, connected through ESnet. We present observed transfer rates, suggested opti- mizations, and discuss the obstacles the tools must overcome to receive wide-spread adoption over scp.

Nam, Hai Ah [ORNL; Hill, Jason J [ORNL; Parete-Koon, Suzanne T [ORNL

2014-01-01T23:59:59.000Z

130

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

131

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

132

Identifying nearby, Young, Late-type Stars by Means of their Circumstellar Disks  

Science Journals Connector (OSTI)

It has recently been shown that a significant fraction of late-type members of nearby, very young associations (age 10Myr) display excess emission at mid-IR wavelengths indicative of dusty circumstellar disks. We demonstrate that the detection of mid-IR excess emission can be utilized to identify new nearby, young, late-type stars including two definite new members ("TWA 33" and "TWA 34") of the TW Hydrae Association (TWA). Both new TWA members display mid-IR excess emission in the Wide-field Infrared Survey Explorer catalog and they show proper motion and youthful spectroscopic characteristicsnamely, H? emission, strong lithium absorption, and low surface gravity features consistent with known TWA members. We also detect mid-IR excessthe first unambiguous evidence of a dusty circumstellar diskaround a previously identified UV-bright, young, accreting star (2M1337) that is a likely member of the Lower-Centaurus Crux region of the Scorpius-Centaurus Complex.

Adam Schneider; Inseok Song; Carl Melis; B. Zuckerman; Mike Bessell

2012-01-01T23:59:59.000Z

133

IDENTIFYING NEARBY, YOUNG, LATE-TYPE STARS BY MEANS OF THEIR CIRCUMSTELLAR DISKS  

SciTech Connect (OSTI)

It has recently been shown that a significant fraction of late-type members of nearby, very young associations (age {approx}<10 Myr) display excess emission at mid-IR wavelengths indicative of dusty circumstellar disks. We demonstrate that the detection of mid-IR excess emission can be utilized to identify new nearby, young, late-type stars including two definite new members ('TWA 33' and 'TWA 34') of the TW Hydrae Association (TWA). Both new TWA members display mid-IR excess emission in the Wide-field Infrared Survey Explorer catalog and they show proper motion and youthful spectroscopic characteristics-namely, H{alpha} emission, strong lithium absorption, and low surface gravity features consistent with known TWA members. We also detect mid-IR excess-the first unambiguous evidence of a dusty circumstellar disk-around a previously identified UV-bright, young, accreting star (2M1337) that is a likely member of the Lower-Centaurus Crux region of the Scorpius-Centaurus Complex.

Schneider, Adam; Song, Inseok [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, E-mail: aschneid@physast.uga.edu, E-mail: song@physast.uga.edu, E-mail: cmelis@ucsd.edu, E-mail: ben@astro.ucla.edu, E-mail: bessell@mso.anu.edu.au [Research School of Astronomy and Astrophysics, The Australian National University, Weston Creek, ACT 2611 (Australia)

2012-10-01T23:59:59.000Z

134

High intensity, short duration rotational grazing on reclaimed cool season tall fescue/legume pastures: II. Forage production, soil and plant tissue comparisons between grazed and ungrazed pastures  

SciTech Connect (OSTI)

The Midway Mine is located 50 miles south of Kansas City, Kansas straddling the border of Kansas and Missouri. The Pittsburg & Midway Coal Mining Co. mined the area until 1989, when the mine was closed and reclaimed. Approximately 3,750 acres were topsoiled and revegetated with a cool season tall fescue/legume pasture. High intensity, short duration rotational grazing has become the preferred management practice on these pastures. This study evaluated soil and vegetation data collected on 1,250 acres of pasture which was grazed by about 550 cow/calf units. Ongoing monitoring programs are evaluating the effects of rotational grazing. Soil testing includes macro-nutrients, micro-nutrients and microbial activity. Plant tissue analyses monitor levels of principal macro-nutrients and micro-nutrients. Vegetation monitoring consists of measuring forage production. Results were contrasted between pregrazing and postgrazing, and grazed and ungrazed pasture. Agronomic data from the grazed versus ungrazed treatments documented the following results: (1) higher levels of plant tissue nitrate, phosphorus, potassium, calcium, magnesium, sodium and sulfur; (2) higher microbial activity; (3) similar levels of soil nitrate, phosphorus, potassium, calcium, magnesium, sodium and sulfur; and (4) increased biomass production.

Carlson, K.E.; Erickson, W.R. [Pittsburg and Midway Coal Mining Co., Englewood, CO (United States); Bonine, R.C. [Agri-Resource Management, Inc., Gallup, NM (United States)

1995-09-01T23:59:59.000Z

135

Study of a solar air flat plate collector: use of obstacles and application for the drying of grape  

Science Journals Connector (OSTI)

In the solar air flat plate collector, the insufficiency of the thermal exchange between the fluid and the absorber obliges the user to enhance their optimization. This low thermal exchange does not allow these systems to obtain their best performance or the best thermal efficiency. In our experimental study, which consists of a solar energy simulation, we have sought to improve the efficiencytemperature rise couple of the flat plate solar collector by considering several types of obstacles disposed in rows in the dynamic air vein of the flat collector. Thus, we have proceeded to the application of the best two systems (WDL1) and (TL) for drying an agricultural product grape. By comparing with the collector without obstacles (WO), the thermal transfers and, consequently, the output temperature (TOC) and the collector efficiency (?) are clearly improved. The drying times obtained with the proposed systems are very interesting. The heat quantities obtained in the case of WDL1 are very important compared with the collector WO. However, the entry to the drying cupboard of this high temperature (TOC) in the vicinity of the solar midday must be limited to the maximal value demanded by the considered product.

A Abene; V Dubois; M Le Ray; A Ouagued

2004-01-01T23:59:59.000Z

136

AMS-02 data confront acceleration of cosmic ray secondaries in nearby sources  

Science Journals Connector (OSTI)

We revisit the model proposed earlier to account for the observed increase in the positron fraction in cosmic rays with increasing energy, in the light of new data from the Alpha Magnetic Spectrometer (AMS-02) experiment. The model accounts for the production and acceleration of secondary electrons and positrons in nearby supernova remnants which results in an additional, harder component that becomes dominant at high energies. By fitting this to AMS-02 data we can calculate the expected concomitant rise of the boron-to-carbon ratio, as well as of the fraction of antiprotons. If these predictions are confirmed by the forthcoming AMS-02 data it would conclusively rule out all other proposed explanations, in particular, dark matter annihilations or decays.

Philipp Mertsch and Subir Sarkar

2014-09-09T23:59:59.000Z

137

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

E-Print Network [OSTI]

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

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

2014-01-01T23:59:59.000Z

138

SILICON ABUNDANCES IN NEARBY STARS FROM THE Si I INFRARED LINES  

SciTech Connect (OSTI)

We have used high-resolution, high signal-to-noise ratio infrared spectra from the Subaru Telescope atop Mauna Kea. Line formation calculations of Si I infrared lines in the atmospheres of nearby stars are presented. All abundance results of [Si/Fe] are derived from local thermodynamic equilibrium (LTE) and NLTE statistical equilibrium calculations and spectrum synthesis methods. We found that NLTE effects for Si I infrared lines are important even for metal-rich stars (>0.1 dex), and the NLTE effects may depend on the surface gravities. A good agreement of silicon abundances between the optical and infrared lines is obtained when the NLTE effects are included, while a large difference is found for the LTE results. The derived silicon abundances are overabundant for metal-poor stars.

Shi, J. R.; Tan, K. F.; Zhao, G. [Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China); Takada-Hidai, M. [Liberal Arts Education Center, Tokai University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292 (Japan); Takeda, Y. [National Astronomical Observatory of Japan 2-21-1 Osawa, Mitaka, Tokyo 181-8588 (Japan); Hu, S. M.; Cao, C., E-mail: sjr@bao.ac.cn [Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Shandong University at Weihai 264209 (China)

2012-08-10T23:59:59.000Z

139

IceCube search for dark matter annihilation in nearby galaxies and galaxy clusters  

Science Journals Connector (OSTI)

We present the results of a first search for self-annihilating dark matter in nearby galaxies and galaxy clusters using a sample of high-energy neutrinos acquired in 339.8days of live time during 2009/10 with the IceCube neutrino observatory in its 59-string configuration. The targets of interest include the Virgo and Coma galaxy clusters, the Andromeda galaxy, and several dwarf galaxies. We obtain upper limits on the cross section as a function of the weakly interacting massive particle mass between 300GeV and 100TeV for the annihilation into bb, W+W-, ?+?-, ?+?-, and ??. A limit derived for the Virgo cluster, when assuming a large effect from subhalos, challenges the weakly interacting massive particle interpretation of a recently observed GeV positron excess in cosmic rays.

M. G. Aartsen et al. (IceCube Collaboration)

2013-12-06T23:59:59.000Z

140

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

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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141

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

142

EXTENDING THE NEARBY GALAXY HERITAGE WITH WISE: FIRST RESULTS FROM THE WISE ENHANCED RESOLUTION GALAXY ATLAS  

SciTech Connect (OSTI)

The Wide-field Infrared Survey Explorer (WISE) mapped the entire sky at mid-infrared wavelengths 3.4 {mu}m, 4.6 {mu}m, 12 {mu}m, and 22 {mu}m. The mission was primarily designed to extract point sources, leaving resolved and extended sources, for the most part, unexplored. Accordingly, we have begun a dedicated WISE Enhanced Resolution Galaxy Atlas (WERGA) project to fully characterize large, nearby galaxies and produce a legacy image atlas and source catalog. Here we demonstrate the first results of the WERGA project for a sample of 17 galaxies, chosen to be of large angular size, diverse morphology, and covering a range in color, stellar mass, and star formation. It includes many well-studied galaxies, such as M 51, M 81, M 87, M 83, M 101, and IC 342. Photometry and surface brightness decomposition is carried out after special super-resolution processing, achieving spatial resolutions similar to that of Spitzer Infrared Array Camera. The enhanced resolution method is summarized in the first paper of this two-part series. In this second work, we present WISE, Spitzer, and Galaxy Evolution Explorer (GALEX) photometric and characterization measurements for the sample galaxies, combining the measurements to study the global properties. We derive star formation rates using the polycyclic aromatic hydrocarbon sensitive 12 {mu}m (W3) fluxes, warm-dust sensitive 22 {mu}m (W4) fluxes, and young massive-star sensitive ultraviolet (UV) fluxes. Stellar masses are estimated using the 3.4 {mu}m (W1) and 4.6 {mu}m (W2) measurements that trace the dominant stellar mass content. We highlight and showcase the detailed results of M 83, comparing the WISE/Spitzer results with the Australia Telescope Compact Array H I gas distribution and GALEX UV emission, tracing the evolution from gas to stars. In addition to the enhanced images, WISE's all-sky coverage provides a tremendous advantage over Spitzer for building a complete nearby galaxy catalog, tracing both stellar mass and star formation histories. We discuss the construction of a complete mid-infrared catalog of galaxies and its complementary role of studying the assembly and evolution of galaxies in the local universe.

Jarrett, T. H.; Masci, F.; Tsai, C. W. [Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125 (United States); Petty, S.; Lake, S.; Wright, E. [Physics and Astronomy Department, University of California, Los Angeles, CA 90095 (United States); Cluver, M. E. [Australian Astronomical Observatory, P.O. Box 915, North Ryde, NSW 1670 (Australia); Assef, Roberto J.; Eisenhardt, P. [Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Mail Stop 169-221, Pasadena, CA 91109 (United States); Benford, D. [NASA Goddard Space Flight Center, Code 665, Greenbelt, MD 20771 (United States); Blain, A. [Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH (United Kingdom); Bridge, C.; Neill, James D. [Department of Astronomy, California Institute of Technology, Pasadena, CA 91125 (United States); Donoso, E. [Spitzer Science Center, IPAC, California Institute of Technology, Pasadena, CA 91125 (United States); Koribalski, B. [CSIRO Astronomy and Space Science, Australia Telescope National Facility (ATNF), P.O. Box 76, Epping, NSW 1710 (Australia); Seibert, M. [Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101 (United States); Sheth, K. [NRAO, 520 Edgemont Road, Charlottesville, VA 22903-2475 (United States); Stanford, S. [Department of Physics, University of California, One Shields Avenue, Davis, CA 95616 (United States)

2013-01-01T23:59:59.000Z

143

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 to the use of artificial neural networks in hydrology ? Eric Gaume and Raphael Gosset Ecole Nationale des for corresponding author: gaume@cereve.enpc.fr Abstract Recently Feed-Forward Artificial Neural Networks (FNN) have

Paris-Sud XI, Université de

144

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

145

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

146

Testing modified gravity at large distances with the HI Nearby Galaxy Surveys rotation curves  

Science Journals Connector (OSTI)

Recently a newquantum motivatedtheory of gravity has been proposed that modifies the standard Newtonian potential at large distances when spherical symmetry is considered. Accordingly, Newtonian gravity is altered by adding an extra Rindler acceleration term that has to be phenomenologically determined. Here we consider a standard and a power-law generalization of the Rindler modified Newtonian potential. The new terms in the gravitational potential are hypothesized to play the role of dark matter in galaxies. Our galactic model includes the mass of the integrated gas, and stars for which we consider three stellar mass functions (Kroupa, diet-Salpeter, and free mass model). We test this idea by fitting rotation curves of seventeen low surface brightness galaxies from the HI Nearby Galaxy Survey (THINGS). We find that the Rindler parameters do not perform a suitable fit to the rotation curves in comparison to standard dark matter profiles (Navarro-Frenk-White and Burkert) and, in addition, the computed parameters of the Rindler gravity show a high spread, posing the model as a nonacceptable alternative to dark matter.

Jorge Mastache; Jorge L. Cervantes-Cota; Axel de la Macorra

2013-03-05T23:59:59.000Z

147

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

148

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

149

Observations of dwarfs in nearby voids: implications for galaxy formation and evolution  

E-Print Network [OSTI]

The intermediate results of the ongoing study of deep samples of ~200 galaxies residing in nearby voids, are presented. Their properties are probed via optical spectroscopy, ugri surface photometry, and HI 21-cm line measurements, with emphasis on their evolutionary status. We derive directly the hydrogen mass M(HI), the ratio M(HI)/L_B and the evolutionary parameter gas-phase O/H. Their luminosities and integrated colours are used to derive stellar mass M(*) and the second evolutionary parameter -- gas mass-fraction f_g. The colours of the outer parts, typically representative of the galaxy oldest stellar population, are used to estimate the upper limits on time since the beginning of the main SF episode. We compare properties of void galaxies with those of the similar late-type galaxies in denser environments. Most of void galaxies show smaller O/H for their luminosity, in average by ~30%, indicating slower evolution. Besides, the fraction of ~10% of the whole void sample or ~30% of the least luminous void ...

Pustilnik, Simon A

2014-01-01T23:59:59.000Z

150

STAR CLUSTERS IN THE NEARBY LATE-TYPE GALAXY NGC 1311  

SciTech Connect (OSTI)

Ultraviolet, optical and near-infrared images of the nearby (D {approx} 5.5 Mpc) SBm galaxy NGC 1311, obtained with the Hubble Space Telescope, reveal a small population of 13 candidate star clusters. We identify candidate star clusters based on a combination of their luminosity, extent, and spectral energy distribution. The masses of the cluster candidates range from {approx}10{sup 3} M{sub sun} up to {approx}10{sup 5} M{sub sun}, and show a strong positive trend of larger mass with increasing with cluster age. Such a trend follows from the fading and dissolution of old, low-mass clusters, and the lack of any young super-star clusters of the sort often formed in strong starbursts. The cluster age distribution is consistent with a bursting mode of cluster formation, with active episodes of age {approx}10 Myr, {approx}100 Myr, and {approx}>Gyr. The ranges of age and mass we probe are consistent with those of the star clusters found in quiescent Local Group dwarf galaxies.

Eskridge, Paul B. [Department of Physics and Astronomy, Minnesota State University, Mankato, MN 56001 (United States); Grijs, Richard de [Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH (United Kingdom); Anders, Peter [Sterrenkundig Instituut, Universiteit Utrecht, NL-3508 TA Utrecht (Netherlands); Windhorst, Rogier A.; Jansen, Rolf A. [School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287 (United States); Mager, Violet A., E-mail: paul.eskridge@mnsu.edu [Department of Physics and Astronomy, Arizona State University, Tempe, AZ 85287 (United States)

2008-01-15T23:59:59.000Z

151

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

152

The discovery of SN2014J in the nearby starburst galaxy M82  

E-Print Network [OSTI]

In this Letter, we report the discovery of SN2014J in the nearby galaxy M82. Given its proximity, it offers the best opportunity to date to study a thermonuclear supernova over a wide range of the electromagnetic spectrum. The first set of optical, near-IR and mid-IR observations of SN2014J, orchestrated by the intermediate Palomar Transient Factory (iPTF), show that SN2014J is a spectroscopically normal Type Ia supernova, albeit exhibiting high-velocity features in its spectrum and heavily reddened by dust in the host galaxy. Our earliest detections start just hours after the fitted time of explosion. We use high-resolution optical spectroscopy to analyze the dense intervening material and do not detect any evolution in the resolved absorption features during the lightcurve rise. Similarly to other highly reddened Type Ia supernovae, a low value of total-to-selective extinction, Rv < 2, provides the best match to our observations. We also study pre-explosion optical and near-IR images from HST with specia...

Goobar, A; Amanullah, R; Fossey, S J; Cao, Y; Perley, D A; Kasliwal, M M; Ferretti, R; Nugent, P E; Harris, C; Gal-Yam, A; Ofek, E O; Tendulkar, S P; Dennefeld, M; Valenti, S; Arcavi, I; Banerjee, D P K; Venkataraman, V; Joshi, V; Ashok, N M; Cenko, S B; Diaz, R F; Fremling, C; Horesh, A; Howell, D A; Kulkarni, S R; Papadogiannakis, S; Petrushevska, T; Sand, D; Sollerman, J; Stanishev, V; Bloom, J S; Surace, J; Cooke, B N; Pollack, G M; Wilde, M; Wright, T

2014-01-01T23:59:59.000Z

153

Lateral systems for tall buildings  

E-Print Network [OSTI]

The advances in three-dimensional structural analysis and computing resources have allowed the efficient and safe design of increasingly taller structures. These structures are the consequence of increasing urban densification ...

Chok, Kermin, 1980-

2004-01-01T23:59:59.000Z

154

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

155

CONSTRAINING STELLAR FEEDBACK: SHOCK-IONIZED GAS IN NEARBY STARBURST GALAXIES  

SciTech Connect (OSTI)

We investigate the properties of feedback-driven shocks in eight nearby starburst galaxies using narrow-band imaging data from the Hubble Space Telescope. We identify the shock-ionized component via the line diagnostic diagram [O III] (?5007)/H? versus [S II] (??6716, 6731) (or [N II] (?6583))/H?, applied to resolved regions 3-15 pc in size. We divide our sample into three sub-samples: sub-solar, solar, and super-solar, for consistent shock measurements. For the sub-solar sub-sample, we derive three scaling relations: (1) L{sub shock}?SFR{sup 0.62}, (2) L{sub shock}??{sub SFR,{sub HL}} {sup 0.92}, and (3) L{sub shock}/L{sub tot}?(L{sub H} /L{sub ?,{sub H}}){sup 0.65}, where L{sub shock} is the H? luminosity from shock-ionized gas, ?{sub SFR,{sub HL}} the star formation rate (SFR) per unit half-light area, L{sub tot} the total H? luminosity, and L{sub H} /L{sub ?,{sub H}} the absolute H-band luminosity from the Two Micron All Sky Survey normalized to solar luminosity. The other two sub-samples do not have enough number statistics, but appear to follow the first scaling relation. The energy recovered indicates that the shocks from stellar feedback in our sample galaxies are fully radiative. If the scaling relations are applicable in general to stellar feedback, our results are similar to those by Hopkins et al. for galactic superwinds. This similarity should, however, be taken with caution at this point, as the underlying physics that enables the transition from radiative shocks to gas outflows in galaxies is still poorly understood.

Hong, Sungryong; Calzetti, Daniela [Department of Astronomy, University of Massachusetts, Amherst, MA 01003 (United States); Gallagher, John S. III [Department of Astronomy, University of Wisconsin-Madison, 475 North Charter Street, Madison, WI 53706 (United States); Martin, Crystal L. [Physics Department, University of California, Santa Barbara, CA 93106-9530 (United States); Conselice, Christopher J. [University of Nottingham, School of Physics and Astronomy, Nottingham NG7 2RD (United Kingdom); Pellerin, Anne [Department of Physics and Astronomy, Texas A and M University, 4242 TAMU, College Station, TX 77843-4242 (United States)

2013-11-01T23:59:59.000Z

156

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

157

Effect to the High Flux Isotope Reactor by the nearby heavy load drop  

SciTech Connect (OSTI)

In this calculation, GE-2000 cask of 25,000 lbs is assumed to drop from a height of 20-ft above the bottom of the High Flux Isotope Reactor (HFIR) pool slab with end velocity of 430 in/sec at the loading station. The consequences of the dynamic impact to the bottom slab of the pool and to the nearby HFIR reactor vessel are analyzed by applying ABAQUS computer code. The results show that both HFIR vessel structure and its supporting legs are subjected to elastic disturbances only and will not be damaged. The bottom slab of the pool will be damaged. The plastic strain that will cause failure to the concrete slab at the point of impact extends a distance approximately half of the slab thickness of 36 inches. The plastic strain of failure for concrete is assumed to be 0.45%. The velocity response spectrum at the concrete slab next to HFIR vessel as a result of the impact is also obtained. The maximum spectral velocity is approximately 10 in/sec. It is approximately equal to the maximum magnitude of the Oak Ridge velocity spectrum formulated recently with 0.26g peak ground acceleration and 5% damping. However, the peak ground acceleration that is associated with the impact generated response spectrum curve can be as much as 20g. The high frequency acceleration waves are generated in impact problems. It is concluded that the damage caused by heavy load drop at loading station is controlled by the slab damage. The damage of slab will not be severe enough to cause the leakage of pool water.

Chang, S.J. [Oak Ridge National Lab., TN (United States). Research Reactors Div.

1996-06-01T23:59:59.000Z

158

THE YOUNG STELLAR POPULATION OF THE NEARBY LATE-TYPE GALAXY NGC 1311  

SciTech Connect (OSTI)

We have extracted point-spread-function-fitted stellar photometry from near-ultraviolet, optical, and near-infrared images, obtained with the Hubble Space Telescope, of the nearby (D {approx} 5.5 Mpc) SBm galaxy NGC 1311. The ultraviolet and optical data reveal a population of hot main-sequence (MS) stars with ages of 2-10 Myr. We also find populations of blue supergiants with ages between 10 and 40 Myr and red supergiants with ages between 10 and 100 Myr. Our near-infrared data show evidence of star formation going back {approx}1 Gyr, in agreement with previous work. Fits to isochrones indicate a metallicity of Z {approx} 0.004. The ratio of blue to red supergiants is consistent with this metallicity. This indicates that NGC 1311 follows the well-known luminosity-metallicity relation for late-type dwarf galaxies. About half of the hot MS stars and blue supergiants are found in two regions in the inner part of NGC 1311. These two regions are each about 200 pc across, and thus have crossing times roughly equal to the 10 Myr age we find for the dominant young population. The luminosity functions of the supergiants indicate a slowly rising star formation rate ({approx}10{sup -3} M{sub sun} yr{sup -1}) from {approx}100 Myr ago until {approx}15 Myr ago, followed by a strong enhancement ({approx}10{sup -2} M{sub sun} yr{sup -1}) at {approx}10 Myr ago. We see no compelling evidence for gaps in the star-forming history of NGC 1311 over the last 100 Myr, and, with lower significance, none over the last Gyr. This argues against a bursting mode, and in favor of a gasping or breathing mode for the recent star formation history.

Eskridge, Paul B. [Department of Physics and Astronomy, Minnesota State University, Mankato, MN 56001 (United States); Windhorst, Rogier A.; Jansen, Rolf A. [School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287 (United States); Mager, Violet A., E-mail: paul.eskridge@mnsu.ed [Department of Physics and Astronomy, Arizona State University, Tempe, AZ 85287 (United States)

2010-11-15T23:59:59.000Z

159

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

160

THEORETICAL EXPLANATION OF THE COSMIC-RAY PERPENDICULAR DIFFUSION COEFFICIENT IN THE NEARBY STARBURST GALAXY NGC 253  

SciTech Connect (OSTI)

Diffusion coefficients are usually used to describe the propagation of cosmic rays through the universe. Whereas such transport parameters can be obtained from experiments in the solar system, it is difficult to determine diffusion coefficients in the Milky Way or in external galaxies. Recently, a value for the perpendicular diffusion coefficient in the nearby starburst galaxy NGC 253 has been proposed. In the present paper, we reproduce this value theoretically by using an advanced analytical theory for perpendicular diffusion.

Buffie, K.; Shalchi, A. [Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2 (Canada)] [Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2 (Canada); Heesen, V., E-mail: shalchi@physics.umanitoba.ca, E-mail: v.heesen@soton.ac.uk [School for Physics and Astronomy, University of Southampton, Southampton SO17 1BJ (United Kingdom)

2013-02-10T23:59:59.000Z

Note: This page contains sample records for the topic "tall obstacles nearby" from the National Library of EnergyBeta (NLEBeta).
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161

Analysis of legal obstacles and incentives to the development of low-head hydroelectric power in Maine  

SciTech Connect (OSTI)

The legal and institutional obstacles to the development of small-scale hydroelectric energy at the state level in Maine is discussed. The Federal government also exercises extensive regulatory authority in the area. The dual regulatory system is examined. The first step any developer of small-scale hydropower must take is to acquire right, title, or interest in the real property. In Maine, that step requires acquisition in some form of both river banks, the river bed, and where necessary, the land needed for the upstream impoundment area. The developer must acquire the river banks to be considered a riparian owner. Classification as a riparian is important, for only a use of water by a riparian owner is deemed a reasonable use and hence a legal use. A non-riparian could not draw water from a stream to increase the water level of an impoundment area on another stream. Apart from the usual methods of land acquisition involving sale, lease, or perhaps gift, Maine has two somewhat unique methods a developer may use for property acquisition. These methods, authorized by statute, are use of the abandoned dams law and use of the Mill Dam Act for flowage of upstream impoundment areas.

None,

1980-05-01T23:59:59.000Z

162

Obstacles to transatlantic trade  

Science Journals Connector (OSTI)

Early this year the US Administration made reference to a marked improvement in the relations between the EC and the USA over the period of the last three years an astonishing statement in the light of the...

Hajo Hasenpflug; Dietrich Kebschull

1976-05-01T23:59:59.000Z

163

Astrometric Detection of Terrestrial Planets in the Habitable Zones of Nearby Stars with SIM PlanetQuest  

E-Print Network [OSTI]

SIM PlanetQuest (Space Interferometry Mission) is a space-borne Michelson interferometer for precision stellar astrometry, with a nine meter baseline, currently slated for launch in 2015. One of the principal science goals is the astrometric detection and orbit characterization of terrestrial planets in the habitable zones of nearby stars. Differential astrometry of the target star against a set of reference stars lying within a degree will allow measurement of the target star's reflex motion with astrometric accuracy of 1 micro-arcsecond in a single measurement. We assess SIM's capability for detection (as opposed to characterization by orbit determination) of terrestrial planets in the habitable zones of nearby solar-type stars. We compare SIM's performance on target lists optimized for the SIM and Terrestrial Planet Finder Coronograph (TPF-C) missions. Performance is quantified by three metrics: minimum detectable planet mass, number and mass distribution of detected planets, and completeness of detections in each mass range. Finally, we discuss the issue of confidence in detections and non-detections, and show how information from SIM's planet survey can enable TPF to increase its yield of terrestrial planets.

Joseph Catanzarite; Michael Shao; Angelle Tanner; Stephen Unwin; Jeffrey Yu

2006-03-24T23:59:59.000Z

164

ALFALFA DISCOVERY OF THE NEARBY GAS-RICH DWARF GALAXY LEO P. III. AN EXTREMELY METAL DEFICIENT GALAXY  

SciTech Connect (OSTI)

We present KPNO 4 m and LBT/MODS spectroscopic observations of an H II 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] {lambda}4363 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{sup +0.0184}{sub -0.0123}, which compares well with the WMAP + BBN prediction of 0.2483 {+-} 0.0002 for the primordial helium abundance. We suggest that surveys of very low mass galaxies compete well with emission line galaxy surveys for finding XMD galaxies. It is possible that XMD galaxies may be divided into two classes: the relatively rare XMD emission line galaxies which are associated with starbursts triggered by infall of low-metallicity gas and the more common, relatively quiescent XMD galaxies like Leo P, with very low chemical abundances due to their intrinsically small masses.

Skillman, Evan D.; Berg, Danielle A.; Olive, Keith A.; McQuinn, Kristen B. W., E-mail: skillman@astro.umn.edu, E-mail: berg@astro.umn.edu, E-mail: olive@physics.umn.edu, E-mail: kmcquinn@astro.umn.edu [Minnesota Institute for Astrophysics, School of Physics and Astronomy, University of Minnesota, 116 Church St. SE, Minneapolis, MN 55455 (United States); and others

2013-07-01T23:59:59.000Z

165

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

166

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

167

The Gas Content and Kinematics of Nearby Blue Compact Galaxies: Implications for Studies at Intermediate and High Redshift  

E-Print Network [OSTI]

We present Arecibo 21 cm spectroscopy, Keck HIRES Hb spectroscopy, and WIYN R-band images of 11 nearby blue compact galaxies selected to be similar to blue compact star-forming galaxies at intermediate redshifts (0.1nearby HII galaxies, irregulars and spirals. Despite the restricted morphological selection, our sample is quite heterogeneous in HI content, dynamical mass, and gas depletion timescale. Therefore, these galaxies should look very different from each other in 5 Gyr. Fading of intermediate-z luminous blue compact galaxies into NGC-type spheroidals is a viable evolutionary scenario for the least massive, most gas-poor objects. The most consistent characteristic of our sample is that the ratio, R, of HII linewidth to HI 21 cm linewidth (W_20) are systematically less than unity. The simplest explanation is that the ionized gas is more centrally concentrated than the neutral gas within the gravitational potential. On average R=0.66 +/- 0.16, similar to findings for local HII galaxies. We find R is also a function of linewidth; smaller linewidth galaxies have smaller values of R. Correcting optical linewidths by this factor raises derived masses and places these galaxies on the local luminosity--linewidth (Tully-Fisher) relation. If this ratio applies to intermediate-redshift galaxies, then the proposed luminosity evolution of the Tully-Fisher relation is much smaller and more gradual than suggested by studies using optical emission-linewidth measurements.

D. J. Pisano; Henry A. Kobulnicky; Rafael Guzman; Jesus Gallego; Matthew A. Bershady; ;

2001-06-21T23:59:59.000Z

168

EARLY RADIO AND X-RAY OBSERVATIONS OF THE YOUNGEST NEARBY TYPE Ia SUPERNOVA PTF 11kly (SN 2011fe)  

SciTech Connect (OSTI)

On 2011 August 24 (UT) the Palomar Transient Factory (PTF) discovered PTF11kly (SN 2011fe), the youngest and most nearby Type Ia supernova (SN Ia) in decades. We followed this event up in the radio (centimeter and millimeter bands) and X-ray bands, starting about a day after the estimated explosion time. We present our analysis of the radio and X-ray observations, yielding the tightest constraints yet placed on the pre-explosion mass-loss rate from the progenitor system of this supernova. We find a robust limit of M-dot {approx}<10{sup -8}(w/100 km s{sup -1}) M{sub sun} yr{sup -1} from sensitive X-ray non-detections, as well as a similar limit from radio data, which depends, however, on assumptions about microphysical parameters. We discuss our results in the context of single-degenerate models for SNe Ia and find that our observations modestly disfavor symbiotic progenitor models involving a red giant donor, but cannot constrain systems accreting from main-sequence or sub-giant stars, including the popular supersoft channel. In view of the proximity of PTF11kly and the sensitivity of our prompt observations, we would have to wait for a long time (a decade or longer) in order to more meaningfully probe the circumstellar matter of SNe Ia.

Horesh, Assaf; Kulkarni, S. R.; Carpenter, John; Kasliwal, Mansi M.; Ofek, Eran O. [Cahill Center for Astrophysics, California Institute of Technology, Pasadena, CA 91125 (United States); Fox, Derek B. [Astronomy and Astrophysics, Eberly College of Science, Pennsylvania State University, University Park, PA 16802 (United States); Quimby, Robert [IPMU, University of Tokyo, Kashiwanoha 5-1-5, Kashiwa-shi, Chiba (Japan); Gal-Yam, Avishay [Benoziyo Center for Astrophysics, Faculty of Physics, Weizmann Institute of Science, Rehovot 76100 (Israel); Cenko, S. Bradley [Department of Astronomy, University of California, Berkeley, CA 94720-3411 (United States); De Bruyn, A. G. [Netherlands Institute for Radio Astronomy (ASTRON), Postbus 2, NL-7990 AA Dwingeloo (Netherlands); Kamble, Atish; Wijers, Ralph A. M. J. [Center for Gravitation and Cosmology, University of Wisconsin, Milwaukee, WI 53211 (United States); Van der Horst, Alexander J. [Universities Space Research Association, NSSTC, Huntsville, AL 35805 (United States); Kouveliotou, Chryssa [Space Science Office, VP-62, NASA-Marshall Space Flight Center, Huntsville, AL 35805 (United States); Podsiadlowski, Philipp; Sullivan, Mark; Maguire, Kate [Department of Physics (Astrophysics), University of Oxford, Keble Road, Oxford OX1 3RH (United Kingdom); Howell, D. Andrew [Las Cumbres Observatory Global Telescope Network, Santa Barbara, CA 93117 (United States); Nugent, Peter E. [Computational Cosmology Center, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720 (United States); Gehrels, Neil [NASA-Goddard Space Flight Center, Greenbelt, MD 20771 (United States); and others

2012-02-10T23:59:59.000Z

169

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

170

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

171

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

172

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); berg, 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

173

Self-interfering matter-wave patterns generated by a moving laser obstacle in a two-dimensional Bose-Einstein condensate inside a power trap cut off by box potential boundaries  

SciTech Connect (OSTI)

We report the observation of highly energetic self-interfering matter-wave (SIMW) patterns generated by a moving obstacle in a two-dimensional Bose-Einstein condensate (BEC) inside a power trap cut off by hard-wall box potential boundaries. The obstacle initially excites circular dispersive waves radiating away from the center of the trap which are reflected from hard-wall box boundaries at the edges of the trap. The resulting interference between outgoing waves from the center of the trap and reflected waves from the box boundaries institutes, to the best of our knowledge, unprecedented SIMW patterns. For this purpose we simulated the time-dependent Gross-Pitaevskii equation using the split-step Crank-Nicolson method and the obstacle was modelled by a moving impenetrable Gaussian potential barrier. Various trapping geometries are considered in which the dynamics of the spatial and momentum density, as well as the energy, are considered. The momentum dynamics reveal an oscillatory behavior for the condensate fraction, indicative of excitations out of and de-excitations back into the condensate state. An oscillatory pattern for the energy dynamics reveals the presence of solitons in the system. Some vortex features are also obtained.

Sakhel, Roger R. [Department of Basic Sciences, Faculty of Information Technology, Isra University, Amman 11622 (Jordan); Sakhel, Asaad R. [Department of Applied Sciences, Faculty of Engineering Technology, Al-Balqa Applied University, Amman 11134 (Jordan); Ghassib, Humam B. [Department of Physics, The University of Jordan, Amman 11942 (Jordan)

2011-09-15T23:59:59.000Z

174

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

175

Vision-based obstacle avoidance  

SciTech Connect (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

176

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 fr theoretische Astrophysik, Zentrum fr Astronomie der Universitt Heidelberg, Albert-Ueberle Str. 2, D-69120 Heidelberg (Germany)] [Institut fr theoretische Astrophysik, Zentrum fr Astronomie der Universitt Heidelberg, Albert-Ueberle Str. 2, D-69120 Heidelberg (Germany); Ott, Jrgen [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 fr Astronomie, Konigstuhl 17, D-69117 Heidelberg (Germany)] [Max-Planck-Institut fr Astronomie, Konigstuhl 17, D-69117 Heidelberg (Germany)

2013-11-01T23:59:59.000Z

177

A search for giant flares from soft gamma-repeaters in nearby galaxies in the Konus-Wind short burst sample  

E-Print Network [OSTI]

The knowledge of the rate of soft gamma-ray repeater (SGR) giant flares is important for understanding the giant flare mechanism and the SGR energy budget in the framework of the magnetar model. We estimate the upper limit to the rate using the results of an extensive search for extragalactic soft gamma-repeater giant flares (GFs) among 140 short gamma-ray bursts detected between 1994 and 2010 by Konus-Wind using InterPlanetary Network (IPN) localizations and temporal parameters. We show that Konus-Wind and the IPN are capable of detecting GFs with energies of 2.3x10^46 erg (which is the energy of the GF from SGR 1806-20 assuming a distance of 15 kpc) at distances of up to about 30 Mpc and GFs with energies of <10^45 erg (which is the energy of the GF from SGR 0526-66) at distances of up to about 6 Mpc. Using a sample of 1896 nearby galaxies we found that only two bursts, GRB 051103 and GRB 070201, have a low chance coincidence probability between an IPN localization and a nearby galaxy. We found the upper...

Svinkin, D S; Aptekar, R L; Golenetskii, S V; Frederiks, D D

2014-01-01T23:59:59.000Z

178

The Nature of Nearby Counterparts to Intermediate Redshift Luminous Compact Blue Galaxies I. Optical/H I Properties and Dynamical Masses  

E-Print Network [OSTI]

We present single-dish H I spectra obtained with the Green Bank Telescope, along with optical photometric properties from the Sloan Digital Sky Survey, of 20 nearby (D < 70 Mpc) Luminous Compact Blue Galaxies (LCBGs). These ~L*, blue, high surface brightness, starbursting galaxies were selected with the same criteria used to define LCBGs at higher redshifts. We find these galaxies are gas-rich, with M(HI) ranging from 5*10^8 to 8*10^9 M_sun, and M(HI)/L_B ranging from 0.2 to 2 M_sun/L_sun, consistent with a variety of morphological types of galaxies. We find the dynamical masses (measured within R_25) span a wide range, from 3*10^9 to 1*10^11 M_sun. However, at least half have dynamical mass-to-light ratios smaller than nearby galaxies of all Hubble types, as found for LCBGs at intermediate redshifts. By comparing line widths and effective radii with local galaxy populations, we find that LCBGs are consistent with the dynamical mass properties of Magellanic (low luminosity) spirals, and the more massive irregulars and dwarf ellipticals, such as NGC 205.

C. A. Garland; D. J. Pisano; J. P. Williams; R. Guzman; F. J. Castander

2004-07-20T23:59:59.000Z

179

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 kiloparseca 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 fr Astronomie, Knigstuhl 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 Astronmico Nacional, Alfonso XII, 3, E-28014 Madrid (Spain); Bigiel, F. [Institut fr theoretische Astrophysik, Zentrum fr Astronomie der Universitt 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

180

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

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

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

182

Near- to Mid- Infrared Imaging and Spectroscopy of Two Buried AGNs of the Nearby Merging Galaxy NGC 6240 with Subaru/IRCS+AO and GTC/CanariCam  

E-Print Network [OSTI]

We report near-infrared K', L', and M' band imaging observations of the nearby merging galaxy NGC 6240 with the Infrared Camera and Spectrograph on the Subaru telescope. The observations were performed with the assistance of the Subaru Adaptive Optics System, and the achieved spatial resolutions were around 0.10--0.20$^{\\prime\\prime}$. We also obtained new mid-infrared imaging in the Si-2 filter band (8.7$\\mu$m) and N-band (7.5--13$\\mu$m) spectroscopy of this galaxy with the CanariCam on the Gran Telescopio Canarias with a spatial resolution of 0.4--0.5$^{\\prime\\prime}$. In the K' band image the two nuclei of the galaxy each show a double-peak suggesting the complex geometry of the source, while the L', M', and Si-2 band images show single compact structures in each of the two nuclei. Assuming that the center core observed at wavelengths longer than 3.8$\\mu$m is associated with dust heated by the buried AGN, we re-evaluated the spectral energy distributions (SEDs) of the southern nucleus from 2 to 30$\\mu$m wi...

Mori, Tamami I; Alonso-Herrero, Almudena; Packham, Chris; Almeida, Cristina Ramos; Nikutta, Robert; OmairaGonzlez-Mart\\'\\in,; Perlman, Eric; Saito, Yuriko; Levenson, Nancy A

2014-01-01T23:59:59.000Z

183

"Dead Quasars" in Nearby Galaxies?  

Science Journals Connector (OSTI)

...orbital plane, since the spins break the mirror symmetry with respect to the orbital...objects indeed obeys the metrics of Schwarzschild and of Kerr. There are, of course...S. Light, R. E. Danielson, M. Schwarzschild, Astrophys. J. 194, 257 (1974...

Martin J. Rees

1990-02-16T23:59:59.000Z

184

Discovery of a Very Nearby Brown Dwarf to the Sun: A Methane Rich Brown Dwarf Companion to the Low Mass Star SCR 1845-6357  

E-Print Network [OSTI]

We present VLT/NACO SDI images of the very nearby star SCR 1845-6357 (hereafter SCR 1845). SCR 1845 is a recently discovered (Hambly et al. 2004) M8.5 star just 3.85 pc from the sun (Henry et al. 2006). Using the capabilities of the unique SDI device, we discovered a substellar companion to SCR 1845 at a separation of 4.5 AU (1.170''+-0.003'' on the sky) and fainter by 3.57+-0.057 mag in the 1.575 um SDI filter. This substellar companion has an H magnitude of 13.16+0.31-0.26 (absolute H magnitude of 15.30+0.31-0.26), making it likely the brightest mid-T dwarf known. The unique Simultaneous Differential Imager (SDI) consists of 3 narrowband filters placed around the 1.6 um methane absorption feature characteristic of T-dwarfs (Teff SCR 1845-6357B. For an age range of 100 Myr - 10 Gyr and spectral type range of T4.5-T6.5, we find a mass range of 9 - 65 MJup for SCR 1845B from the Baraffe et al. 2003 COND models. SCR 1845AB is the 24th closest stellar system to the Sun (at 3.85 pc); the only brown dwarf system closer to the Sun is Eps Indi Ba-Bb (at 3.626 pc). In addition, this is the first T-dwarf companion discovered around a low mass star.

B. A. Biller; M. Kasper; L. M. Close; W. Brandner; S. Kellner

2006-01-19T23:59:59.000Z

185

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

186

The Nature of Nearby Counterparts to Intermediate-Redshift Luminous Compact Blue Galaxies. III. Interferometric Observations of Neutral Atomic and Molecular Gas  

E-Print Network [OSTI]

We present the results of a VLA and OVRO-MMA follow-up to our single-dish surveys of the neutral atomic and molecular gas in a sample of nearby Luminous Compact Blue Galaxies (LCBGs). These luminous, blue, high surface brightness, starbursting galaxies were selected using criteria similar to that used to define LCBGs at higher redshifts. The surveys were undertaken to study the nature and evolutionary possibilities of LCBGs, using dynamical masses and gas depletion time scales as constraints. Here we present nearly resolved VLA H I maps of four LCBGs, as well as results from the literature for a fifth LCBG. In addition, we present OVRO-MMA maps of CO(J=1-0) in two of these LCBGs. We have used the resolved H I maps to separate the H I emission from target galaxies and their companions to improve the accuracy of our gas and dynamical mass estimates. For this sub-sample of LCBGs, we find that the dynamical masses measured with the single-dish telescope and interferometer are in agreement. However, we find that we have overestimated the mass of H I in two galaxies by a significant amount, possibly as much as 75%, when compared to the single-dish estimates. These two galaxies have companions within a few arc minutes; we find that our single-dish and interferometric measurements of H I masses are in reasonable agreement for galaxies with more distant companions. The H I velocity fields indicate that all five galaxies are clearly rotating yet distorted, likely due to recent interactions. Our measurements of the gas and dynamical masses of LCBGs point towards evolution into low mass galaxies such as dwarf ellipticals, irregulars, and low mass spirals, consistent with studies of LCBGs at higher redshifts.

C. A. Garland; D. J. Pisano; J. P. Williams; R. Guzman; F. J. Castander; L. J. Sage

2007-08-20T23:59:59.000Z

187

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

188

NUMERICAL SOLUTION OF AN INVERSE OBSTACLE ...  

E-Print Network [OSTI]

such as nanotechnology, biology, information storage, and surface chemistry. Recently novel approaches have been developed for solving a class of inverse...

2014-09-30T23:59:59.000Z

189

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

190

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

191

Evaluation of Gas Retention in Waste Simulants: Tall Column Experiments  

SciTech Connect (OSTI)

Gas generation in Hanfords 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

192

Negative Resists for Ultra-Tall, High Aspect Ratio Microstructures  

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

less than 1m over a process area of 80mm for 1mm high structures. A broad process window was demonstrated, which can be used to fine-tune the sidewall verticality as well...

193

Improving UK greenhouse gas emission estimates using tall tower observations  

E-Print Network [OSTI]

Greenhouse gases in the Earths 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

194

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.

195

Black Holes in 4 Nearby Radio Galaxies  

E-Print Network [OSTI]

We study the velocity dispersion profiles of the nuclei of NGC 1326, 2685, 5273 and 5838 in the CO first overtone band. There is evidence for a black hole (BH) in NGC 1326 and 5838. Gas is seen flowing out of the nuclear region of NGC 5273. We put upper limits on the nuclear BHs responsible for its activity and that of NGC 2685.

Mould, Jeremy; Cotter, Garret; Batt, David; Durre', Mark

2014-01-01T23:59:59.000Z

196

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

197

Flying between obstacles with an autonomous knife-edge maneuver  

E-Print Network [OSTI]

We develop an aircraft and control system that is capable of repeatedly performing a high speed (7m/s or 16 MPH) "knife-edge" maneuver through a gap that is smaller than the aircraft's wingspan. The maneuver consists of ...

Barry, Andrew J. (Andrew James)

2012-01-01T23:59:59.000Z

198

Obstacles to Collectivization Among Indigenous Communities: Two Venezuelan Cases  

E-Print Network [OSTI]

: University of Michigan Press. Schwartz, Barry 1970 "Notes on the Sociology of Sleep." Sociological Quarterly 11:485-499. SPSS Inc. 1986 SPSSX User's Guide. 2nd ed. New York: McGraw-HilI. Stoneall, Linda 01983 Country Life, City Life. New York: Praeger. Turner... and the Prince" stand above the collec tivity.14 This ideology, reinforced daily in a variety of ways has further unified the Bari against outside influence. ' In contrast to the history of the Bari, the Pume lost all of their land to the large cattle ranches...

Gouveia, Lourdes

1988-01-01T23:59:59.000Z

199

THE TWO-PHASE FRACTIONAL OBSTACLE PROBLEM 1 ...  

E-Print Network [OSTI]

rate of the minimizers from the free boundary (Theorem 6.1) which then implies ...... Passing to the limit, we obtain that vj converges (over a subsequence) ...... G. Duvaut and J.-L. Lions, Inequalities in mechanics and physics, Springer-Verlag,.

2014-06-26T23:59:59.000Z

200

Political obstacles to adopting congestion pricing in New York City  

E-Print Network [OSTI]

In April 2007, New York City's Mayor Bloomberg released PlaNYC, a broad ranging set of planning initiatives for the city. A centerpiece of the plan was a congestion-pricing proposal for the downtown core in Manhattan. The ...

Lynch, Patrick (Patrick Michael)

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.


201

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

202

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

E-Print Network [OSTI]

to improve existing incentive programs. By far the most important incentives, according to CHP developers and supporters, are tax incentives or other types of incentives (such as feed-in-tariffs) that offer a set monetary benefit per system output... developers were keen to discuss was a feed-in-tariff (FIT). A FIT is a long-term contract a generator may enter into with a utility to have the generator?s power purchased at a set rate ? typically higher than the wholesale rates that some CHP systems now...

Chittum, A.; Kaufman, N.

2011-01-01T23:59:59.000Z

203

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

204

Dissertation while on internship: Obstacles and predictors of progress  

E-Print Network [OSTI]

Dissertation status of intern applicants is an issue for training directors and students alike. Two major concerns are that students may fail to finish the dissertation after the internship and that they may be distracted during internship while...

Krieshok, Thomas S.; Lopez, Shane J.; Somberg, D. R.; Cantrell, P. J.

2000-06-01T23:59:59.000Z

205

Maritime intent estimation and the detection of unknown obstacles  

E-Print Network [OSTI]

The benefits of using Unmanned Undersea Vehicles (UUVs) in maritime operations are numerous. However, before these benefits can be realized, UUV capabilities must be expanded. This thesis focuses on improving certain aspects ...

Fong, Edward H. L. (Edward Hsiang Lung), 1980-

2004-01-01T23:59:59.000Z

206

BPA and partners surmount unique obstacles on Grand Coulee project  

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

credits the project's success to relying on the expert support of the team, including BPA substation engineer James Kelly, transmission designer Len Custer, tower designers...

207

The Pressure of Water Waves upon a Fixed Obstacle  

Science Journals Connector (OSTI)

...approximations are made for sections of ship form. The examination was made...applications in the problem of a ship advancing through a train of waves...small proportion of the observed effect; the motions of the ship, and in particular its oscillations...

1940-01-01T23:59:59.000Z

208

Gamesplaying An Obstacle to Cost-Effective Grant Spending  

Science Journals Connector (OSTI)

According to Dorothy Jongeward, author of Everybody Wins: Transactional Analysis Applied to Organizations,

Frea E. Sladek; Eugene L. Stein

1981-01-01T23:59:59.000Z

209

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

210

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

211

Multiple scattering of surface waves from discrete obstacles  

Science Journals Connector (OSTI)

......complete time domain response to a given incident...and the dominant frequencies of regional phases...propagation at a frequency of 1Hz. The model...X (2m + 1) and storage considerations limit...note that the energy in the fundamental Rayleigh mode R1 at frequencies as high as 1.0Hz......

M. G. Bostock; B. L. N. Kennett

1992-01-01T23:59:59.000Z

212

Stereo-Vision-Based Obstacle Avoidance in Rough Outdoor Terrain  

E-Print Network [OSTI]

on chemical or nuclear plants are only a few possible scenarios. Unmanned vehicles could patrol frontiers and powerful robot navigation system for rough and vegetated outdoor terrain. Vegetation in that context of natural disasters, large-scale accidents and terrorism. Fire infernos, hurricanes, air crashes and attacks

Berns, Karsten

213

Obstacle Avoidance for Trajectory Tracking Control of Wheeled Mobile Robots  

Science Journals Connector (OSTI)

The wheeled mobile robots used in the flexible manufacturing systems act ... proposes a new control method for the wheeled mobile robots movement in the presence of static and...

R?zvan ?olea; Daniela Cristina Cernega

2013-01-01T23:59:59.000Z

214

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

215

NREL Overcomes Obstacles in Lignin Valorization (Fact Sheet)...  

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

Going forward, this approach can be applied to many different types of biomass feedstocks and combined with a variety of strategies for breaking down lignin, engineering...

216

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,...

217

The modeling of complex continua: Fundamental obstacles and grand challenges  

SciTech Connect (OSTI)

The research is divided into: discontinuities and adaptive computation, chaotic flows, dispersion of flow in porous media, and nonlinear waves and nonlinear materials. The research program has emphasized innovative computation and theory. The approach depends on abstracting mathematical concepts and computational methods from individual applications to a wide range of problems involving complex continua. The generic difficulties in the modeling of continua that guide this abstraction are multiple length and time scales, microstructures (bubbles, droplets, vortices, crystal defects), and chaotic or random phenomena described by a statistical formulation.

Not Available

1993-01-01T23:59:59.000Z

218

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

219

Comparison of Nitrogen Fixation Activity in Tall and Short Spartina alterniflora Salt Marsh Soils  

Science Journals Connector (OSTI)

...North Carolina salt marshes. Ecology 44:445-456. 2. Brooks, R. H., P. L. Brezonik...of a Virginia salt marsh. Chesapeake Sci...Marsho, T. V., R. P. Burchard, and...limitation in salt marsh vegetation, p. 547-563. In R. J. Reimold and...

Roger B. Hanson

1977-03-01T23:59:59.000Z

220

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

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

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

222

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

223

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

224

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

225

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

226

Utilization of eui Gene from a Recessive Tall Rice Mutant 02428h in Breeding  

Science Journals Connector (OSTI)

In order to improve the panicle extrusion of photo- and thermo-sensitive sterile line Pei'ai 64S by using elongated uppermost internode (eui) gene of the wide compatibility rice mutant 02428h, a new photo- and thermo-sensitive sterile line P8hS characterized with elongated uppermost internode was developed by transferring the eui gene into Pei'ai 64S through three successive backcrossing. Compared with Pei'ai 64S, the plant height of \\{P8hS\\} was 35.6 cm higher resulted from the elongation of the uppermost and the second internodes from the top. The panicle extrusion of Pei'ai 64S was completely improved and positive effects were found on the main economic characters of \\{P8hS\\} and its hybrids by introducing eui gene into Pei'ai 64S.

Cai-lin WANG; Ling ZHAO; Zhen ZHU; Ya-dong ZHANG

2007-01-01T23:59:59.000Z

227

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

228

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 building life cycle consideration. The talk will outline basic strategies for "Sustainable Building Design on climate change, the depletion of the earth's resources, widespread pollution, the concept of sustainable

Tam, Vincent W. L.

229

Detection of a tall ridge at the coremantle boundary from scattered PKP energy  

Science Journals Connector (OSTI)

......a Random Medium (1960) New York: McGraw-Hill Book Company...model for the mantle from new Rayleigh wave dispersion...analysis of PKKP precursor energy. Earth planet. Sci. Lett...Earth (2008) 2nd edn. New York: Springer Verlag and AIP......

Daniel A. Frost; Sebastian Rost; Neil D. Selby; Graham W. Stuart

2013-01-01T23:59:59.000Z

230

Lateral loading and response for a tall building in the non-seismic doldrums  

Science Journals Connector (OSTI)

The situation for building design against wind and earthquake effects in Singapore is apparently unique. There is no seismic design code as there is no local seismicity, yet the effects of significant regional earthquakes are frequently felt in many high rise buildings in Singapore. Whereas it has become clear that the strongest winds in Singapore originate from storms and squalls, design for wind by law requires use of an arbitrary design wind speed applied in a British loading code geared to cyclonic wind systems. A decade of monitoring of a 280m office tower has shown that distant strong earthquakes generate dynamic response typically an order of magnitude greater than due to the strongest winds occurring during the same period. The effect is greater for high rise apartment blocks and it is becoming clear that for extreme events with similar return periods, earthquake effects should govern design for lateral load in terms of dynamic base shears under such conditions. For the present, building control authorities take code provisions for accidental eccentricity to be adequate in covering seismic loads. While there have been moves towards a more rational local code, there remains an open question about the relationship of static and dynamic effects due to wind for both cyclonic and (thunder)storm winds. In this paper, the evidence concerning the nature of the two forms of loading is presented, and the various existing and potential code provisions examined.

James M.W. Brownjohn

2005-01-01T23:59:59.000Z

231

Jointly organised by Centre for Asian Tall Buildings and Urban Habitat  

E-Print Network [OSTI]

that cause inconvenience to customers, and the repair of which is costly and disruptive to traffic, commerce Kong since 1999. He is currently involved in the design and construction supervision of pipeline management, water and environmental engineering, pipeline rehabilitation and associated topics. In 1994 he

Tam, Vincent W. L.

232

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

233

An investigation of design alternatives for 328-ft (100-m) tall wind turbine towers.  

E-Print Network [OSTI]

??As wind turbines are continued to be placed at higher elevations, the need for taller wind turbine towers becomes necessary. However, there are multiple challenges (more)

Lewin, Thomas James

2010-01-01T23:59:59.000Z

234

Performance-based serviceability design optimization of wind sensitive tall buildings.  

E-Print Network [OSTI]

??Recent trends towards developing increasingly taller and irregularly-shaped buildings have led to slender complex structures that are highly sensitive and susceptible to wind-induced deflection and (more)

Huang, Mingfeng

2008-01-01T23:59:59.000Z

235

xvi Preface to the second edition Acknowledgments  

E-Print Network [OSTI]

Before me is a grassy green field. It has a line of trees at its far edge and is punctuated by a spruce from a nearby trellis. I reach for a tall glass of iced tea, still cold to the touch and flavored: that there was a green field before me, that there were bird songs, that there was a smell of roses, that my glass

Fitelson, Branden

236

The Photometric Properties of Nearby Type Ia Supernovae  

E-Print Network [OSTI]

discovery and subsequent study of the accelerating expansion of the Universe and dark energy (discovery that the Universe is expanding at an accelerating rate, probably due to an unexplained, unidentified dark energy.

Ganeshalingam, Mohan

2012-01-01T23:59:59.000Z

237

There goes the neighborhood: performance degradation due to nearby jobs  

Science Journals Connector (OSTI)

Predictable performance is important for understanding and alleviating application performance issues; quantifying the effects of source code, compiler, or system software changes; estimating the time required for batch jobs; and determining the allocation ... Keywords: communication performance, interference, resource management, system noise, torus networks

Abhinav Bhatele; Kathryn Mohror; Steven H. Langer; Katherine E. Isaacs

2013-11-01T23:59:59.000Z

238

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

239

Evidence of nearby supernovae affecting life on Earth  

Science Journals Connector (OSTI)

......using a random generator to make a uniform...primaries on atmospheric ionization will...CCN on which water droplets form...that simulate atmospheric conditions...sulphur dioxide and water, might slow...and growth of atmospheric aerosols, its...and liquid-water clouds is discernible......

Henrik Svensmark

2012-06-21T23:59:59.000Z

240

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

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

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

242

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

243

Nearby boundaries create eddies near microscopic filter feeders  

Science Journals Connector (OSTI)

...28 microm apart, with the Vorticella midway between the two slides and without the...and simulations, with the Vorticella midway between two slides and with h = 127 28...coverslip (grey box), which is inserted midway between two slides, a distance h apart...

2010-01-01T23:59:59.000Z

244

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

245

Fundamental properties of nearby single early B-type stars  

E-Print Network [OSTI]

Fundamental parameters of a sample of 26 apparently slowly-rotating single early B-type stars in the solar neighbourhood are presented and compared to high-precision data from detached eclipsing binaries (DEBs). The data are used to discuss the evolutionary status of the stars in context of the most recent Geneva grid of models. Evolutionary masses plus radii and luminosities are determined to better than typically 5%, 10%, and 20% uncertainty, respectively, facilitating the mass-radius and mass-luminosity relationships to be recovered with a similar precision as derived from DEBs. Good agreement between evolutionary and spectroscopic masses is found. Absolute visual and bolometric magnitudes are derived to typically 0.15-0.20mag uncertainty. Metallicities are constrained to better than 15-20% uncertainty and tight constraints on evolutionary ages of the stars are provided. Signatures of mixing with CN-cycled material are found in 1/3 of the sample stars. Typically, these are consistent with the amount predic...

Nieva, Maria-Fernanda

2014-01-01T23:59:59.000Z

246

Spheromak global instabilities and stabilization by nearby conductors  

Science Journals Connector (OSTI)

By means of a three?dimensional (3?D) magnetohydrodynamic (MHD) simulation the stabilization effects of conducting walls on the tilting instability of spheromaks created by the Princeton induction method are extensively studied. The nonlinear development and deformation of the spheromak resulting from global instabilities with toroidal modes n=1 (tilting) 2 and 3 are also studied in detail. Simulation results have shown that while the induction effect of the wall current is insufficient the line?tying effect is much more powerful for the suppression of the strong tilting instability. For a perfect line?tying stabilization a certain amount of surface magnetic flux around the spheromak should be tied to the conducting wall. Next the influence of the shape of the cylindrical vacuum vessel on the stabilization is studied. It is found that the created spheromak assumes a similar figure irrespective of the vessel shape; thus we conclude that controlling the spheromak shape by changing the vacuum vessel is ineffective. Also investigated is the tilting behavior when the magnetic index is changed. The result is not conclusive in the sense that a well?developed oblate spheromak could not be created when the magnetic index was close to 1. Simulation runs in which n=2 and n=3 perturbations are applied in addition to the tilt mode (n=1) have shown that the spheromak with a large aspect ratio is unstable to all of these modes. Interestingly it is found that as the n=2 mode develops sufficiently the spheromak torus is severely folded and twisted; consequently the folded arms undergo reconnection internally.

Takaya Hayashi; Tetsuya Sato

1985-01-01T23:59:59.000Z

247

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

248

INFRARED SPECTROSCOPY OF NEARBY RADIO ACTIVE ELLIPTICAL GALAXIES  

SciTech Connect (OSTI)

In preparation for a study of their circumnuclear gas we have surveyed 60% of a complete sample of elliptical galaxies within 75 Mpc that are radio sources. Some 20% of our nuclear spectra have infrared emission lines, mostly Paschen lines, Brackett {gamma}, and [Fe II]. We consider the influence of radio power and black hole mass in relation to the spectra. Access to the spectra is provided here as a community resource.

Mould, Jeremy [Centre for Astrophysics and Supercomputing Swinburne University, Hawthorn, Vic 3122 (Australia); Reynolds, Tristan [School of Physics, University of Melbourne, Melbourne, Vic 3100 (Australia); Readhead, Tony; Matthews, Keith [Palomar Observatory, California Institute of Technology 249-17, Pasadena, CA 91125 (United States); Floyd, David; Brown, Michael [School of Physics, Monash University, Clayton, Vic 3800 (Australia); Jannuzi, Buell; Atlee, David [Steward Observatory, University of Arizona (formerly at NOAO), Tucson, AZ 85719 (United States); Cotter, Garret [Department of Physics, University of Oxford, Denys, Oxford, Keble Road, OX13RH (United Kingdom); Ferrarese, Laura, E-mail: jmould@swin.edu.au [Herzberg Institute of Astrophysics Herzberg, Saanich Road, Victoria V8X4M6 (Canada)

2012-11-15T23:59:59.000Z

249

Cerro Prieto cold water injection: effects on nearby production wells  

E-Print Network [OSTI]

studies on Cerro Prieto. CFE-DOE Symp. in Geothermal Energy,Hiriart Le Bert, G. (1990). CFE-DOE agreement for the studyde Cerro Prieto. Proc. CFE-DOE Symp. in Geothermal Energy,

Truesdell, A.H.

2010-01-01T23:59:59.000Z

250

Cerro Prieto cold water injection: effects on nearby production wells  

SciTech Connect (OSTI)

The liquid-dominated Cerro Prieto geothermal field of northern Baja California, Mexico has been under commercial exploitation since 1973. During the early years of operation, all waste brines were sent to an evaporation pond built west of the production area. In 1989, cooled pond brines began to be successfully injected into the reservoir along the western boundary of the geothermal system. The injection rate varied over the years, and is at present about 20% of the total fluid extracted. As expected under the continental desert conditions prevailing in the area, the temperature and salinity of the pond brines change with the seasons, being higher during the summer and lower during the winter. The chemistry of pond brines is also affected by precipitation of silica, oxidation of H{sub 2}S and reaction with airborne clays. Several production wells in the western part of the field (CP-I area) showed beneficial effects from injection. The chemical (chloride, isotopic) and physical (enthalpy, flow rate) changes observed in producers close to the injectors are reviewed. Some wells showed steam flow increases, in others steam flow decline rates flattened. Because of their higher density, injected brines migrated downward in the reservoir and showed up in deep wells.

Truesdell, A.H.; Lippmann, M.J.; De Leon, J.; Rodriguez, M.H.

1999-07-01T23:59:59.000Z

251

Wind Energy Assessment Study for Nevada -- Tall Tower Deployment (Stone Cabin): 26 June 2005 - 31 December 2007  

SciTech Connect (OSTI)

The objective of this work effort was to characterize wind shear and turbulence for representative wind-developable areas in Nevada.

Koracin, D.; Reinhardt, R.; McCurdy, G.; Liddle, M.; McCord, T.; Vellore, R.; Minor, T.; Lyles, B.; Miller, D.; Ronchetti, L.

2009-12-01T23:59:59.000Z

252

Long-Term Carbon Dioxide Fluxes from a Very Tall Tower in a Northern Forest: Flux Measurement Methodology  

Science Journals Connector (OSTI)

Methodology for determining fluxes of CO2 and H2O vapor with the eddy-covariance method using data from instruments on a 447-m tower in the forest of northern Wisconsin is addressed. The primary goal of this study is the validation of the methods ...

Bradford W. Berger; Kenneth J. Davis; Chuixiang Yi; Peter S. Bakwin; Cong Long Zhao

2001-04-01T23:59:59.000Z

253

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

254

Characteristics of 50200-m Winds and Temperatures Derived from an Iowa Tall-Tower Network  

Science Journals Connector (OSTI)

Limitations in skill of wind speed forecasts lead to conservative bids of wind-plant production in the day-ahead energy market and usually to an underutilization of wind resources. Improvements are needed in understanding wind characteristics in ...

Renee A. Walton; Eugene S. Takle; William A. Gallus Jr.

2014-10-01T23:59:59.000Z

255

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

256

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

E-Print Network [OSTI]

increasing the cooling load due to its heat dissipation. Proper design for the maximization of natural light helps reduce the use of artificial lights and results in reduction in the buildings energy consumption. Computer simulation of the lighting and energy...

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

2010-01-01T23:59:59.000Z

257

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

258

Virtualpolitik: Obstacles to Building Virtual Communities in Traditional Institutions of Knowledge  

E-Print Network [OSTI]

Liberty, Equality, Fraternity: Exploring the French Revolution; The Salem Witch Trials Documentary Archive and Transcription Project

Losh, Elizabeth

2005-01-01T23:59:59.000Z

259

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

260

Real-Time Path Planning and Terrain Obstacle Performance for General Aviation Aircraft  

E-Print Network [OSTI]

and Scope Proposed Solution: 1. Search Space 2. Basic Search Algorithm 3. Performance Improvement Techniques Near all-weather accessibility to 5,400 public-use airports? 5400 Public Use Airports Of 5,400 public, Valavanis, Tsourveloudis, Kostaras) Motion-library based trajectory planning (Richards, Ward) Simplified

Valasek, John

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

Analog VLSI Implementations of Visual Motion Sensors and a Neuromorphic Obstacle Avoidance System  

E-Print Network [OSTI]

Family #12;iv Acknowledgements I would like to thank my family for their endless support and love through . . . . . . . . . . . . . . . . . . . 3 1.2 Monolithic and multi-chip implementations . . . . . . . . . . . . . . . . . . . . . . . 4 1 building blocks 6 2.1 MOSFET operation

262

Performance characterization of swept ramp obstacle fields in pulse detonation applications .  

E-Print Network [OSTI]

??Pulse Detonation technology offers the potential for substantial increases in thrust and fuel efficiency in subsonic and supersonic flight Mach ranges through the use of (more)

Dvorak, William T.

2010-01-01T23:59:59.000Z

263

Discussion paper: how much of commonsense and legal reasoning is formalizable? A review of conceptual obstacles  

Science Journals Connector (OSTI)

......does not follow the plan of symbolic logic...counterfactuals. The standard theory of them involves...problem: a critical review of 15 years of research...to identify the standard of proof beyond...process, Harvard Law Review 84 (1971), 132993...logic beneath the standards of proof, Cornell......

James Franklin

2012-01-01T23:59:59.000Z

264

Multi-layer approach to motion planning in obstacle rich environment  

E-Print Network [OSTI]

processes the image in SIMULINK. Acquired information through the vision system is fed into the trajectory generation package software in MATLAB to create the map of the environment and execute motion planning. Depending on the condi- tion of the environment... processes the image in SIMULINK. Acquired information through the vision system is fed into the trajectory generation package software in MATLAB to create the map of the environment and execute motion planning. Depending on the condi- tion of the environment...

Kim, Sung Hyun

2009-05-15T23:59:59.000Z

265

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

266

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

267

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

268

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

269

NEAR-FIELD IMAGING OF OBSTACLES Peijun Li and Yuliang Wang  

E-Print Network [OSTI]

applications in modern science and technology, such as nanotechnology, biology, information storage, and surface chemistry. Using near-field imaging, we

2014-06-30T23:59:59.000Z

270

Speciation with gene flow in a heterogeneous virtual world: can physical obstacles accelerate speciation?  

Science Journals Connector (OSTI)

...grant ORGPIN 341854, the CRC grant 950-2-3617 and the CFI grant 203617 and is made possible...simulation. Lecture Notes in Computer Science, 6335, IEEE International...and extinction rates. | School of Computer Science, University of Windsor...

2012-01-01T23:59:59.000Z

271

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.

272

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

273

Obstacles to and Facilitators of the Implementation of Small Urban Wind Turbines in the Netherlands  

Science Journals Connector (OSTI)

Reducing emissions of CO2...and other environmentally unfriendly gases is an important issue and a great challenge. For this reason, several new energy technologies (e.g. wind power, photovoltaic solar power, com...

Linda M. Kamp

2010-01-01T23:59:59.000Z

274

Discussion paper: how much of commonsense and legal reasoning is formalizable? A review of conceptual obstacles  

Science Journals Connector (OSTI)

......and so on. His plan is to identify...branch of his vast plan, and--while...system should not waste its time computing...24 Lenat's plan is heavily dependent...whose role as a repository of commonsense...counterfactuals. The standard theory of them...problem: a critical review of 15 years of......

James Franklin

2012-01-01T23:59:59.000Z

275

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

E-Print Network [OSTI]

and Wireless Channel Measurements Alejandro Gonzalez-Ruiz, Alireza Ghaffarkhah, Yasamin Mostofi Abstract-through capabilities using laser and wireless channel measurements, which can provide mapping capabilities beyond and mapped based on wireless channel measurements. For the latter, we extend our recently-proposed wireless

Liebling, Michael

276

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

277

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

E-Print Network [OSTI]

Compressed air systems are among the most common and least efficient electrical end uses in industrial plants. Over 50% of plants use compressed air systems. According to various estimates, between 20% and 35% of the energy used in these systems...

Trojanowski, D.; Parfomak, P.

278

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

279

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

280

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

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

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

282

Role of Thermochemical Conversion in Livestock Waste-to-Energy Treatments:? Obstacles and Opportunities  

Science Journals Connector (OSTI)

Dry wastes like poultry litter and feedlot manures can be processed directly via pyrolysis and air/steam gasification technology. ... The net energy (ETotal) from gasifying swine waste is estimated as the summation of Erxn, EWs, and the energy value of product gas (EGas). ... The land disposal of waste from the poultry industry and subsequent environmental implications has stimulated interest into cleaner and more useful disposal options. ...

Keri Cantrell; Kyoung Ro; Devinder Mahajan; Mouzhgun Anjom; Patrick G. Hunt

2007-11-01T23:59:59.000Z

283

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

E-Print Network [OSTI]

??Denne oppgaven ser p thoriums forelpig uavklarte skjebne i Norge. Mlene er f frem koblinger til historie og omgivelser; kaste lys over kontroversen som (more)

Hersoug, Elisabeth

2008-01-01T23:59:59.000Z

284

Removing Career Obstacles for Young Physician-Scientists Loan-Repayment Programs  

Science Journals Connector (OSTI)

...physician-scientists in a recent address to the American Society for Clinical Investigation and the American Association of Physicians: "Don't be invisible!" He meant that physician-scientists occasionally need to find the time to teach medical school classes, "take resident's report," and make rounds... The pool of physician-scientists is dwindling, as it has been for more than two decades.1,2 There are many reasons for this problem,317 but the most important one involves the initial decision whether to pursue a career in research.16,17 When ...

Ley T.J.; Rosenberg L.E.

2002-01-31T23:59:59.000Z

285

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

286

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

287

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

288

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

289

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

290

J. Bouvier, A. Chalabaev, C. Charbonnel (eds) THE NEARBY SUPERNOVA FACTORY: TOWARD A HIGH-PRECISION  

E-Print Network [OSTI]

redshift observations played a major role in the discovery of the "dark energy" component of the universe

Aragon, Cecilia R.

291

ALFALFA DISCOVERY OF THE NEARBY GAS-RICH DWARF GALAXY LEO P. I. H I OBSERVATIONS  

SciTech Connect (OSTI)

The discovery of a previously unknown 21 cm H I line source identified as an ultra-compact high velocity cloud in the ALFALFA survey is reported. The H I detection is barely resolved by the Arecibo 305 m telescope {approx}4' beam and has a narrow H I linewidth (half-power full width of 24 km s{sup -1}). Further H I observations at Arecibo and with the Very Large Array corroborate the ALFALFA H I detection, provide an estimate of the H I radius, {approx}1' at the 5 Multiplication-Sign 10{sup 19} cm{sup -2} isophote, and show the cloud to exhibit a velocity field which, if interpreted as disk rotation, has an amplitude of {approx_equal}9.0 {+-} 1.5 km s{sup -1}. In other papers, Rhode et al. show the H I source to have a resolved stellar counterpart and ongoing star forming activity, while Skillman et al. reveal it as having extremely low metallicity: 12 + log (O/H) = 7.16 {+-} 0.04. The H I 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 to obtain a distance estimate D{sub Mpc}=1.3{sup +0.9}{sub -0.5}. Additional constraints on the distance are also provided by the optical data of Rhode et al. and McQuinn et al., both indicating a distance in the range of 1.5 to 2.0 Mpc. The three estimates are compatible within their errors. The object appears to be located beyond the dynamical boundaries of, but still in close proximity to the Local Group. Its pristine properties are consistent with the sedate environment of its location. At a nominal distance of 1.75 Mpc, it would have an H I mass of {approx_equal} 1.0 Multiplication-Sign 10{sup 6} M {sub Sun }, a stellar mass of {approx_equal} 3.6 Multiplication-Sign 10{sup 5} M {sub Sun }, and a dynamical mass within the H I radius of {approx_equal} 1.5 Multiplication-Sign 10{sup 7} M {sub Sun }. This discovery supports the idea that optically faint-or altogether dark-low mass halos may be detectable through their non-stellar baryons.

Giovanelli, Riccardo; Haynes, Martha P.; Adams, Elizabeth A. K. [Center for Radiophysics and Space Research, Space Sciences Building, Cornell University, Ithaca, NY 14853 (United States); Cannon, John M.; Bernstein-Cooper, Elijah Z. [Department of Physics and Astronomy, Macalester College, Saint Paul, MN 55105 (United States); Rhode, Katherine L.; Salzer, John J. [Department of Astronomy, Indiana University, Bloomington, IN 47405 (United States); Skillman, Evan D.; McQuinn, Kristen B. W., E-mail: riccardo@astro.cornell.edu, E-mail: haynes@astro.cornell.edu, E-mail: betsey@astro.cornell.edu, E-mail: jcannon@macalester.edu, E-mail: ebernste@macalester.edu, E-mail: rhode@astro.indiana.edu, E-mail: slaz@astro.indiana.edu, E-mail: skillman@astro.umn.edu, E-mail: kmcquinn@astro.umn.edu [Minnesota Institute for Astrophysics, University of Minnesota, Minneapolis, MN 55455 (United States)

2013-07-01T23:59:59.000Z

292

SDSS1133: an unusually persistent transient in a nearby dwarf galaxy  

Science Journals Connector (OSTI)

......of broad-line AGNs. SNe IIn occur in a dense circumstellar medium (CSM) created by pre-SN mass-loss, and the narrow hydrogen...between 2003 and 2013. This could be dust in the post-shock medium that is obscuring emission from ejecta components in the receding......

Michael Koss; Laura Blecha; Richard Mushotzky; Chao Ling Hung; Sylvain Veilleux; Benny Trakhtenbrot; Kevin Schawinski; Daniel Stern; Nathan Smith; Yanxia Li; Allison Man; Alexei V. Filippenko; Jon C. Mauerhan; Kris Stanek; David Sanders

2014-01-01T23:59:59.000Z

293

The very nearby M/T dwarf binary SCR 1845-6357  

E-Print Network [OSTI]

The recently discovered star SCR 1845-6357 is the first late M/T dwarf binary discovered. SCR 1845 is a particular object due to its tight orbit (currently around 4 AU) and its proximity to the Sun (3.85 pc). We present spatially resolved VLT/NACO images and low resolution spectra of SCR 1845 in the J, H and K near-infrared bands. Since the T dwarf companion, SCR 1845B, is so close to the primary SCR 1845A, orbital motion is evident even within a year. Following the orbital motion, the binary's mass can be measured accurately within a decade, making SCR 1845B a key T-dwarf mass-luminosity calibrator. The NIR spectra allow for accurate determination of spectral type and also for rough estimates of the object's physical parameters. The spectral type of SCR 1845B is determined by direct comparison of the flux calibrated JHK spectra with T dwarf standard template spectra and also by NIR spectral indices obtained from synthetic photometry. Constrained values for surface gravity, effective temperature and metallicity are derived by comparison with model spectra. Our data prove that SCR 1845B is a brown dwarf of spectral type T6 that is co-moving with and therefore gravitationally bound to the M8.5 primary. Fitting the NIR spectrum of SCR 1845B to model spectra yields an effective temperature of about 950K and a surface gravity log(g)=5.1 (cgs) assuming solar metallicity. Mass and age of SCR 1845B are in the range 40 to 50 Jupiter masses and 1.8 to 3.1 Gyr.

Markus Kasper; Beth A. Biller; Adam Burrows; Wolfgang Brandner; Jano Budaj; Laird M. Close

2007-06-26T23:59:59.000Z

294

Effects of the shutdown of a nuclear fuel reprocessing plant on nearby streams  

Science Journals Connector (OSTI)

In a study conducted in 1971, levels of tritium were found in Cattaraugus-Creek, a stream in Western New York State. This material was attributed to the operation in West Valley, New York of the world's first...

B. A. Bolton; M. A. Salerno; Ph. K. Hopke

1974-01-01T23:59:59.000Z

295

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

296

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

297

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

298

Improved precision on the radius of the nearby super-Earth 55 Cnc e  

E-Print Network [OSTI]

We report on new transit photometry for the super-Earth 55 Cnc e obtained with Warm Spitzer/IRAC at 4.5 microns. An individual analysis of these new data leads to a planet radius of 2.21-0.16+0.15 Rearth, in good agreement with the values previously derived from the MOST and Spitzer transit discovery data. A global analysis of both Spitzer transit time-series improves the precision on the radius of the planet at 4.5 microns to 2.20+-0.12 Rearth. We also performed an independent analysis of the MOST data, paying particular attention to the influence of the systematic effects of instrumental origin on the derived parameters and errors by including them in a global model instead of performing a preliminary detrending-filtering processing. We deduce from this reanalysis of MOST data an optical planet radius of 2.04+-0.15 Rearth that is consistent with our Spitzer infrared radius. Assuming the achromaticity of the transit depth, we performed a global analysis combining Spitzer and MOST data that results in a plane...

Gillon, M; Benneke, B; Valencia, D; Deming, D; Seager, S; Lovis, C; Mayor, M; Pepe, F; Queloz, D; Segransan, Damien; Udry, S

2011-01-01T23:59:59.000Z

299

Improved precision on the radius of the nearby super-Earth 55 Cnc e  

E-Print Network [OSTI]

We report on new transit photometry for the super-Earth 55?Cnc?e obtained with Warm Spitzer/IRAC at 4.5 ?m. An individual analysis of these new data leads to a planet radius of [superscript 2.21]+0.15 [over] -0.16 R[subscript ...

Gillon, M.

300

Phenological variation in annual timing of hibernation and breeding in nearby populations of Arctic ground squirrels  

Science Journals Connector (OSTI)

...1 s.e., unless otherwise stated. ANOVAs and Kruskal-Wallis non-parametric tests were performed using the software...re-tested. If the assumptions were still not met, a Kruskal-Wallis one-way ANOVA on ranks was performed. Comparisons...

2011-01-01T23:59:59.000Z

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.


301

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.

302

Wind?energy farm noise impacts on nearby residencesthe citizen's view  

Science Journals Connector (OSTI)

Wind?energy farms with hundreds of wind turbines have proliferated in close proximity to residential properties without any apparent control on the noise impact consequences. Annoying and intrusive wind turbinenoise occurred as soon as the first turbines were installed. The adverse noise impact has continued and intensified as additional WECS (wind energy conversion system) sites were approved and developed with the installation of hundreds of additional turbines. The adverse noiseeffects consist of low?frequency noise that is not fully addressed or controlled by only A?weighted sound level standards pure tones and higher noise levels during higher wind?speed conditions. More stringent noise controls should have been implemented in the beginning. Riverside County has recently adopted a more stringent noise standard that also includes a pure tone restriction that will apply to future sites. However mitigation of the mistakes made at the earlier sites remains to be resolved.

John R. Warner

1986-01-01T23:59:59.000Z

303

A search for H I absorption in nearby radio galaxies using HIPASS  

Science Journals Connector (OSTI)

......galaxies: active|galaxies: ISM|galaxies: nuclei|radio...within galaxies and the available fuel for future star formation...4-=-1330-Jy; Cooper, Price Cole 1965) and assuming a spectral...1693. Cooper B. F. C. , Price R. M., Cole D. J. Aust......

J. R. Allison; E. M. Sadler; A. M. Meekin

2014-01-01T23:59:59.000Z

304

Can small islands protect nearby coasts from tsunamis? An active experimental design approach  

Science Journals Connector (OSTI)

...Jaffe, H. Fritz, B. Higman, R. Morton, J. Goff, and C Synolakis. 2005 Observations by the international tsunami survey team in Sri Lanka. Science 308, 1595 ( doi:10.1126/science.1110730 ) 2 Titov, V. , A. Rabinovich, H...

2014-01-01T23:59:59.000Z

305

Magnetars in the Metagalaxy: An Origin for Ultra High Energy Cosmic Rays in the Nearby Universe  

E-Print Network [OSTI]

I show that the relativistic winds of newly born magnetars with khz initial spin rates, occurring in all normal galaxies, can accelerate ultrarelativistic light ions with an E^{-1} injection spectrum, steepening to E^{-2} at higher energies, with an upper cutoff above 10^{21} eV. Interactions with the CMB yield a spectrum in good accord with the observed spectrum of Ultra-High Energy Cosmic Rays (UHECR), if ~ 5-10% of the magnetars are born with voltages sufficiently high to accelerate the UHECR. The form the spectrum spectrum takes depends on the gravitational wave losses during the magnetars' early spindown - pure electromagnetic spindown yields a flattening of the E^3 J(E) spectrum below 10^{20} eV, while a moderate GZK ``cutoff'' appears if gravitational wave losses are strong enough. I outline the physics such that the high energy particles escape with small energy losses from a magnetar's natal supernova, including Rayleigh-Taylor ``shredding'' of the supernova envelope, expansion of a relativistic blast wave into the interstellar medium, acceleration of the UHE ions through surf-riding in the electromgnetic fields of the wind, and escape of the UHE ions in the rotational equator with negligible radiation loss. The abundance of interstellar supershells and unusually large supernova remnants suggests that most of the initial spindown energy is radiated in khz gravitational waves for several hours after each supernova, with effective strains from sources at typical distances ~ 3 x 10^{-21}. Such bursts of gravitational radiation should correlate with bursts of ultra-high energy particles. The Auger experiment should see such bursts every few years.

Jonathan Arons

2002-08-23T23:59:59.000Z

306

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

307

A deep proper-motion survey of the nearby open cluster Blanco 1  

Science Journals Connector (OSTI)

......All-Sky Point Source Catalog, NASA/IPAC Infrared Science Archive, http://irsa.ipac.caltech.edu/applications/Gator/ . de Epstein A. A. E. , Epstein I., 1985, AJ, 90, 1211. Eggen O. J. , 1970, ApJ, 161, 159. ESA, 1997, The......

I. Platais; T. M. Girard; K. Vieira; C. E. Lpez; C. Loomis; B. J. McLean; D. Pourbaix; E. Moraux; J.-C. Mermilliod; D. J. James; P. A. Cargile; S. A. Barnes; D. J. Castillo

2011-05-11T23:59:59.000Z

308

The Nature of Nearby Counterparts to Intermediate Redshift Luminous Compact Blue Galaxies II. CO Observations  

E-Print Network [OSTI]

We present the results of a single-dish beam-matched survey of the three lowest rotational transitions of CO in a sample of 20 local (D < 70 Mpc) Luminous Compact Blue Galaxies (LCBGs). These ~L*, blue, high surface brightness, starbursting galaxies were selected with the same criteria used to define LCBGs at higher redshifts. Our detection rate was 70%, with those galaxies having Lblue<7e9 Lsun no detected. We find the H2 masses of local LCBGs range from 6.6e6 to 2.7e9 Msun, assuming a Galactic CO-to-H2 conversion factor. Combining these results with our earlier HI survey of the same sample, we find that the ratio of molecular to atomic gas mass is low, typically 5-10%. Using a Large Velocity Gradient model, we find that the average gas conditions of the entire ISM in local LCBGs are similar to those found in the centers of star forming regions in our Galaxy, and nuclear regions of other galaxies. Star formation rates, determined from IRAS fluxes, are a few solar masses per year, much higher per unit dynamical mass than normal spirals. If this rate remains constant, the molecular hydrogen depletion time scales are short, 10-200 Myr.

C. A. Garland; J. P. Williams; D. J. Pisano; R. Guzman; F. J. Castander; J. Brinkmann

2005-02-03T23:59:59.000Z

309

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

310

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

311

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

312

Macroscopic erosion of plasma facing and nearby components during plasma instabilities: the droplet shielding phenomenon  

E-Print Network [OSTI]

be extremely high. This can severely limit divertor system lifetime to only a few disruptions. Ablation is mass; Shielding; Lifetime; HEIGHTS package 1. Introduction During plasma disruptions, the power ¯ux reaching to the reduced radiation power for a reasonable disruption frequency. However, mass losses due to ablation can

Harilal, S. S.

313

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

314

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

315

Initiation mechanisms of low-loss swept-ramp obstacles for deflagration to detonation transition in pulse detonation combustors .  

E-Print Network [OSTI]

??In order to enhance the performance of pulse detonation combustors (PDCs), an efficient deflagration-to-detonation transition (DDT) process is critical to maintain the thermodynamic benefits of (more)

Myers, Charles B.

2009-01-01T23:59:59.000Z

316

Small firm growth in the Australian biotechnology industry: a study of obstacles to the commercialisation of Australian biotechnology research.  

E-Print Network [OSTI]

??Bibliography: p. 209-223. Introduction The biotechnology industry Literature review Methodology Case studies Discussion Conclusion. Australia has a strong record (more)

Bondarew, Veronica

2007-01-01T23:59:59.000Z

317

obstacle avoidance, and tracking. Faloutsos et al. (2001) show a highly realistic physics-based simulation of complex human body  

E-Print Network [OSTI]

strategies found in insects. These strategies exploit the distribution of local light intensities and lo- cal, Switzerland; f Department of Electrical, Electronical and Systems Engineering, University of Catania, 95125 into biology. We analyze the rea- sons why biorobotics has been essentially a one-way street. We argue

Elhilali, Mounya

318

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

E-Print Network [OSTI]

). Inexplicably and inexcusably the diagrams of surface shear stress lines labelled figure 15(a) (i) and (ii. 570 should be replaced by the following text: Lykoudis (Purdue)gave an analysis of liquid-metal MHD- developed laminar-flow analysis for an MHD duct flow, to work out the effects of these two layers. He

Cambridge, University of

319

Social Entrepreneurship in the Colombian Choco: An investigation into the processes , obstacles and Impacts of the Commercialization of Smoked Fish.  

E-Print Network [OSTI]

??This study looks at the commercialization of smoked fish on the Pacific coast of Colombia. Innovative individuals have identified this historical process of fish preservation (more)

Stacy, Tyler

2010-01-01T23:59:59.000Z

320

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

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

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.

322

Application of Microwave Methods for Characterization of NEG Coatings and Obstacle Detection in Accelerator Beam-pipes  

E-Print Network [OSTI]

In many particle accelerators, including the LHC at the European Organization for Nuclear Research CERN, NEG coatings are used to improve vacuum performance. In other particle accelerators there have been hints that those coatings could have a relevant impact on the beam coupling impedance, however the data available is contradictory. To clarify the possible impact of NEG coatings the electromagnetic properties have been measured. The measurements have been carried out by means of cavity perturbation method. The second part of this thesis deals with the microwave waveguide reflectometer developed at CERN several years ago, which is used as part of the quality assurance test program for the LHC assembly. To ensure optimum operation and to avoid an expensive removal of any foreign object from inside the LHC beam-screen after its completion, microwave reflectometry is performed. Until now several objects have been found by means of reflectometry, but so far neither precise data about the reflections of different...

Seebacher, David

2009-01-01T23:59:59.000Z

323

Stonehenge-like auditory illusion evoked by interference pattern  

Science Journals Connector (OSTI)

Blindfolded participants hearing an interference pattern attributed the dead zones to the presence of acoustic obstructions in an arrangement reminiscent of Stonehenge. Without prior mention of interference or Stonehenge participants were brought blindfolded to an open field with two English flutes atop thin 1?m tall wooden stands 2?m apart connected via tubing to an air pump giving a sustained pitch of C#5 (1?100 Hz). One by one participants were led blindfolded in a 7.6?m radius circle around the pair of flutes. Afterward faced away from the setup they were instructed to remove blindfolds and independently draw and describe what you thought was between you and the noise. Although there actually were no physical obstacles the resulting drawings from all three participants represented arrangements of objects having many characteristics in common with Stonehenge; verbal descriptions included pillars solid objects openings tall vertical slats. These pilot results demonstrate regions of low sound intensity due to destructive interference of sound waves from musical instruments can be misperceived as an auditory illusion of acoustic shadows cast by a ring of large obstructions. Measurements of acoustic shadows radiating out from Stonehenge are consistent with the hypothesis that interference patterns served as blueprints for the design.

Steven J. Waller

2011-01-01T23:59:59.000Z

324

Grasshopper Biology  

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

Grasshopper Biology Grasshopper Biology Name: s. Location: N/A Country: N/A Date: N/A Question: My son found a grasshopper and put it in a fish bowl with cover, and we need to know what to feed it? we have it some lettuce and apple and a bit of water. Replies: Sounds ok so far, most any kind of green plant should be ok, doubt it will pay too much attention to the water. Don't expect it to live very long though. J. Elliott Hello, Grasshoppers eat green vegetation of various kinds. They especially love tall grass. The greener the better. Clip a variety of plants from a nearby unmowed ditch or vacant lot and place them in a short container of water and place the container of water and plants in your fish bowl. The grasshopper will "eat it up". Wayne Vanderploeg River Trail Nature Center

325

Overview of the Nearby Supernova Factory G. Alderinga, G. Adamb, P. Antilogusc, P. Astierd, R. Baconb, S. Bongardc, C. Bonnaudb,  

E-Print Network [OSTI]

. Their cosmological use was developed in the early 1990's, paving the way for the discovery of dark energy.1, 4­10 Now, cosmology, integral-field-unit, spectrograph 1. PROBING DARK ENERGY WITH SUPERNOVAE A coherent view of the universe is emerging in which a mysterious form of "dark energy" accounts for about 2/3 of the total energy

Paris-Sud XI, Université de

326

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

E-Print Network [OSTI]

Electro?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

327

Risk, trust and place: a mixed methods investigation into community perceptions of a nearby nuclear power station.  

E-Print Network [OSTI]

??Recent UK government policy advocates the expansion of nuclear power, and indicated that any new nuclear power stations will be built mostly at existing 'nuclear' (more)

Venables, Daniel

2011-01-01T23:59:59.000Z

328

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

329

IRREGULAR SLOSHING COLD FRONTS IN THE NEARBY MERGING GROUPS NGC 7618 AND UGC 12491: EVIDENCE FOR KELVIN-HELMHOLTZ INSTABILITIES  

SciTech Connect (OSTI)

We present results from two {approx}30 ks Chandra observations of the hot atmospheres of the merging galaxy groups centered around NGC 7618 and UGC 12491. Our images show the presence of arc-like sloshing cold fronts (CFs) wrapped around each group center and {approx}100 kpc long spiral tails in both groups. Most interestingly, the CFs are highly distorted in both groups, exhibiting 'wings' along the fronts. These features resemble the structures predicted from non-viscous hydrodynamic simulations of gas sloshing, where Kelvin-Helmholtz instabilities (KHIs) distort the CFs. This is in contrast to the structure seen in many other sloshing and merger CFs, which are smooth and featureless at the current observational resolution. Both magnetic fields and viscosity have been invoked to explain the absence of KHIs in these smooth CFs, but the NGC 7618/UGC 12491 pair are two in a growing number of both sloshing and merger CFs that appear distorted. Magnetic fields and/or viscosity may be able to suppress the growth of KHIs at the CFs in some clusters and groups, but clearly not in all. We propose that the presence or absence of KHI distortions in CFs can be used as a measure of the effective viscosity and/or magnetic field strengths in the intracluster medium.

Roediger, E. [School of Engineering and Science, Jacobs University Bremen, Campus Ring 1, 28759 Bremen (Germany); Kraft, R. P.; Machacek, M. E.; Forman, W. R.; Nulsen, P. E. J.; Jones, C.; Murray, S. S., E-mail: e.roediger@jacobs-university.de [Harvard/Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)

2012-08-01T23:59:59.000Z

330

Nearby supernova rates from the Lick Observatory Supernova Search IV. A recovery method for the delay-time distribution  

Science Journals Connector (OSTI)

......distribution (DTD) - the SN rate versus time that would...SN progenitors and physics, as well as on the...curve, normalized to pass through the psi3 rate, which is the most...again normalized to pass through our best-fitting psi3 rate. The DD-Close-3......

Dan Maoz; Filippo Mannucci; Weidong Li; Alexei V. Filippenko; Massimo Della Valle; Nino Panagia

2011-04-11T23:59:59.000Z

331

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

Science Journals Connector (OSTI)

...profiles of temperature vs. depth at Camp Century, Greenland, coincide to better...radian and 5.510 m/yr for Camp Century (7) and ?0.004 radian and 12.8...depth in the bottom part of the Camp Century and Byrd Station glaciers allows...

P. Buford Price; Oleg V. Nagornov; Ryan Bay; Dmitry Chirkin; Yudong He; Predrag Miocinovic; Austin Richards; Kurt Woschnagg; Bruce Koci; Victor Zagorodnov

2002-01-01T23:59:59.000Z

332

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

333

Luminosity Function of Galaxies in the Nearby Universe: The Low-Luminosity End of the Nuclear Activity Sequence  

Science Journals Connector (OSTI)

......Low-Luminosity End of the Nuclear Activity Sequence Baltasar...possibility that go- ing to weaker nuclear line fluxes might change the...carried out with the present dataset is on their average properties...lumi- nosity levels, the nuclear blue continuum is not expected......

Baltasar Vila-Vilaro

2000-04-01T23:59:59.000Z

334

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

335

The Spitzer c2d Survey of Nearby Dense Cores. X. Star Formation in L673 and CB188  

Science Journals Connector (OSTI)

L673 and CB188 are two low-mass clouds isolated from large star-forming regions that were observed as part of the Spitzer Legacy Project "From Molecular Clouds to Planet Forming disks" (c2d). We identified and characterized all the young stellar objects (YSOs) of these two regions and modeled their spectral energy distributions (SEDs) to examine whether their physical properties are consistent with values predicted from the theoretical models and with the YSO properties in the c2d survey of larger clouds. Overall, 30 YSO candidates were identified by the c2d photometric criteria, 27 in L673 and 3 in CB188. We confirm the YSO nature of 29 of them and remove a false Class III candidate in L673. We further present the discovery of two new YSO candidates, one Class 0 and another possible Class I candidate in L673, therefore bringing the total number of YSO candidates to 31. Multiple sites of star formation are present within L673, closely resembling other well-studied c2d clouds containing small groups such as B59 and L1251B, whereas CB188 seems to consist of only one isolated globule-like core. We measure a star formation efficiency (SFE) of 4.6%, which resembles the SFE of the larger c2d clouds. From the SED modeling of our YSO sample we obtain envelope masses for Class I and Flat spectrum sources of 0.01-1.0 M ?. The majority of Class II YSOs show disk accretion rates from 3.3 ? 1010 to 3 ? 108 M ? yr1 and disk masses that peak at 104 to 103 M ?. Finally, we examined the possibility of thermal fragmentation in L673 as the main star-forming process. We find that the mean density of the regions where significant YSO clustering occurs is of the order of ~105 cm3 using 850 ?m observations and measure a Jeans Length that is greater than the near-neighbor YSO separations by approximately a factor of 3-4. We therefore suggest that other processes, such as turbulence and shock waves, may have had a significant effect on the cloud's filamentary structure and YSO clustering.

Anastasia E. Tsitali; Tyler L. Bourke; Dawn E. Peterson; Philip C. Myers; Michael M. Dunham; Neal J. Evans II; Tracy L. Huard

2010-01-01T23:59:59.000Z

336

THE SPITZER c2d SURVEY OF NEARBY DENSE CORES. X. STAR FORMATION IN L673 AND CB188  

SciTech Connect (OSTI)

L673 and CB188 are two low-mass clouds isolated from large star-forming regions that were observed as part of the Spitzer Legacy Project 'From Molecular Clouds to Planet Forming disks' (c2d). We identified and characterized all the young stellar objects (YSOs) of these two regions and modeled their spectral energy distributions (SEDs) to examine whether their physical properties are consistent with values predicted from the theoretical models and with the YSO properties in the c2d survey of larger clouds. Overall, 30 YSO candidates were identified by the c2d photometric criteria, 27 in L673 and 3 in CB188. We confirm the YSO nature of 29 of them and remove a false Class III candidate in L673. We further present the discovery of two new YSO candidates, one Class 0 and another possible Class I candidate in L673, therefore bringing the total number of YSO candidates to 31. Multiple sites of star formation are present within L673, closely resembling other well-studied c2d clouds containing small groups such as B59 and L1251B, whereas CB188 seems to consist of only one isolated globule-like core. We measure a star formation efficiency (SFE) of 4.6%, which resembles the SFE of the larger c2d clouds. From the SED modeling of our YSO sample we obtain envelope masses for Class I and Flat spectrum sources of 0.01-1.0 M{sub sun}. The majority of Class II YSOs show disk accretion rates from 3.3 x 10{sup -10} to 3 x 10{sup -8} M{sub sun} yr{sup -1} and disk masses that peak at 10{sup -4} to 10{sup -3} M{sub sun}. Finally, we examined the possibility of thermal fragmentation in L673 as the main star-forming process. We find that the mean density of the regions where significant YSO clustering occurs is of the order of {approx}10{sup 5} cm{sup -3} using 850 {mu}m observations and measure a Jeans Length that is greater than the near-neighbor YSO separations by approximately a factor of 3-4. We therefore suggest that other processes, such as turbulence and shock waves, may have had a significant effect on the cloud's filamentary structure and YSO clustering.

Tsitali, Anastasia E.; Bourke, Tyler L.; Peterson, Dawn E.; Myers, Philip C. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Dunham, Michael M.; Evans, Neal J. [Department of Astronomy, The University of Texas at Austin, 1 University Station, C1400, Austin, TX 78712-0259 (United States); Huard, Tracy L., E-mail: atsitali@cfa.harvard.ed, E-mail: tbourke@cfa.harvard.ed, E-mail: dpeterson@cfa.harvard.ed, E-mail: pmyers@cfa.harvard.ed, E-mail: at306@soton.ac.u, E-mail: mdunham@astro.as.utexas.ed, E-mail: nje@astro.as.utexas.ed, E-mail: thuard@astro.umd.ed [University of Maryland, College Park, MD (United States)

2010-12-20T23:59:59.000Z

337

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

338

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.

339

ALMA observations of feeding and feedback in nearby Seyfert galaxies: an AGN-driven outflow in NGC 1433  

E-Print Network [OSTI]

We report ALMA observations of CO(3-2) emission in the Seyfert 2 double-barred galaxy NGC1433, at the unprecedented spatial resolution of 0.5"=24 pc. Our aim is to probe AGN feeding and feedback phenomena through the morphology and dynamics of the gas inside the central kpc. The CO map, which covers the whole nuclear region (nuclear bar and ring), reveals a nuclear gaseous spiral structure, inside the nuclear ring encircling the nuclear stellar bar. This gaseous spiral is well correlated with the dusty spiral seen in Hubble Space Telescope images. The nuclear spiral winds up in a pseudo-ring at 200 pc radius, which might correspond to the inner ILR. Continuum emission is detected at 0.87 mm only at the very centre, and its origin is more likely thermal dust emission than non-thermal emission from the AGN. It might correspond to the molecular torus expected to exist in this Seyfert 2 galaxy. The HCN(4-3) and HCO+(4-3) lines were observed simultaneously, but only upper limits are derived, with a ratio to the CO...

Combes, F; Casasola, V; Hunt, L; Krips, M; Baker, A J; Boone, F; Eckart, A; Marquez, I; Neri, R; Schinnerer, E; Tacconi, L J

2013-01-01T23:59:59.000Z

340

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.

Note: This page contains sample records for the topic "tall obstacles nearby" from the National Library of EnergyBeta (NLEBeta).
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they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

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

342

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

343

Contribution of power and desalination plants to the levels of volatile liquid hydrocarbons in the nearby coastal areas of Kuwait  

SciTech Connect (OSTI)

The levels and distribution of volatile liquid hydrocarbons (VLHs) were determined in Kuwait`s coastal areas in the vicinity of outlets of power and desalination plants. About 230 samples were collected from the selected sampling locations over the 4 seasons. The VLHs in the samples were analyzed using Grob`s closed-loop stripping technique and GC with FID and confirmed by GC/MS. The results showed that significant levels of VLHs were present. The levels ranged from 307 to 6,500 ng/L and from 2,880 to 7,811 ng/L in Kuwait Bay and Sulaibekhat Bay, respectively. The annual average for VLHs near Al-Zor power plant ranged from 465 to 4,665 ng/L. Benzenoids formed the bulk (about 80%) of the VLHs present. Comparison with the levels in the outlets indicated that Doha West power plant contributed much higher levels of VLHs to the coastal areas than Al-Zor plant.

Saeed, T.; Khordagui, H.; Al-Hashash, H. [Kuwait Inst. for Scientific Research, Safat (Kuwait). Environmental Sciences Dept.] [Kuwait Inst. for Scientific Research, Safat (Kuwait). Environmental Sciences Dept.

1999-07-01T23:59:59.000Z

344

Color-Magnitude Distribution of Face-on nearby Galaxies in Sloan Digital Sky Survey DR7  

Science Journals Connector (OSTI)

We have analyzed the distributions in the color-magnitude diagram (CMD) of a large sample of face-on galaxies to minimize the effect of dust extinctions on galaxy color. About 300,000 galaxies with log (a/b) z u r)0.1 = 0.121M r, 0.1 0.061. The fraction of blue cloud and red sequence galaxies turns over around M r, 0.1 ~ 20.1 mag, corresponding to stellar mass of 3 ? 1010 M ?. For the 2D GMM fitting, a total of four Gaussians are required, one for the blue cloud, one for the red sequence, and the additional two for the green valley. The fact that two Gaussians are needed to describe the distributions of galaxies in the green valley is consistent with some models that argue for two different evolutionary paths from the blue cloud to the red sequence.

Shuo-Wen Jin; Qiusheng Gu; Song Huang; Yong Shi; Long-Long Feng

2014-01-01T23:59:59.000Z

345

A UNIVERSAL, LOCAL STAR FORMATION LAW IN GALACTIC CLOUDS, NEARBY GALAXIES, HIGH-REDSHIFT DISKS, AND STARBURSTS  

SciTech Connect (OSTI)

Star formation laws are rules that relate the rate of star formation in a particular region, either an entire galaxy or some portion of it, to the properties of the gas, or other galactic properties, in that region. While observations of Local Group galaxies show a very simple, local star formation law in which the star formation rate per unit area in each patch of a galaxy scales linearly with the molecular gas surface density in that patch, recent observations of both Milky Way molecular clouds and high-redshift galaxies apparently show a more complicated relationship in which regions of equal molecular gas surface density can form stars at quite different rates. These data have been interpreted as implying either that different star formation laws may apply in different circumstances, that the star formation law is sensitive to large-scale galaxy properties rather than local properties, or that there are high-density thresholds for star formation. Here we collate observations of the relationship between gas and star formation rate from resolved observations of Milky Way molecular clouds, from kpc-scale observations of Local Group galaxies, and from unresolved observations of both disk and starburst galaxies in the local universe and at high redshift. We show that all of these data are in fact consistent with a simple, local, volumetric star formation law. The apparent variations stem from the fact that the observed objects have a wide variety of three-dimensional size scales and degrees of internal clumping, so even at fixed gas column density the regions being observed can have wildly varying volume densities. We provide a simple theoretical framework to remove this projection effect, and we use it to show that all the data, from small solar neighborhood clouds with masses {approx}10{sup 3} M{sub Sun} to submillimeter galaxies with masses {approx}10{sup 11} M{sub Sun }, fall on a single star formation law in which the star formation rate is simply {approx}1% of the molecular gas mass per local free-fall time. In contrast, proposed star formation laws in which the star formation timescale is set by the galactic rotation period are inconsistent with the data from the Milky Way and the Local Group, while those in which the star formation rate is linearly proportional to the gas mass above some density threshold fail both in the Local Group and for starburst galaxies.

Krumholz, Mark R. [Department of Astronomy, University of California, Santa Cruz, CA 95064 (United States); Dekel, Avishai [Racah Institute of Physics, Hebrew University, Jerusalem 91904 (Israel); McKee, Christopher F., E-mail: krumholz@ucolick.org, E-mail: dekel@phys.huji.ac.il, E-mail: cmckee@astro.berkeley.edu [Departments of Physics and Astronomy, University of California, Berkeley, CA 94720 (United States)

2012-01-20T23:59:59.000Z

346

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

347

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

348

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

349

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

350

High Statistics Study of Nearby Type 1a Supernovae. QUEST Camera Short Term Maintenance: Final Technical Report  

SciTech Connect (OSTI)

The Quest Camera was installed at the Palomar Obervatory in California. The camera was used to carry out a survey of low redshift Type 1a supernovae.The purpose of this DOE grant was to perform short term maintenance on the QUEST camera.

Baltay, Charles

2012-10-16T23:59:59.000Z

351

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

352

Mandating Solar Hot Water by California Local Governments: Legal Issues  

E-Print Network [OSTI]

Legal Obstacles to Decentralized Solar Energy Technologies:Legal Obstacles to Decentralized Solar Energy Technologies,of solar energy systems and to remove obstacles thereto."

Hoffman,, Peter C.

1981-01-01T23:59:59.000Z

353

New England Wind Forum: In My Backyard? Aesthetics, Property Value, and  

Wind Powering America (EERE)

In My Backyard? In My Backyard? Modern wind turbines are tall structures when compared to other nearby man-made and natural objects, as required to capture stronger and less turbulent winds at greater heights. Unlike many other areas in the country where the windiest areas are remote, New England's high population density means that wind turbines are often visible from some nearby communities and residences, raising aesthetic concerns. This effect is further compounded by the fact that, for on-shore applications, most turbines will need to be sited at higher elevations on mountain or hill ridgelines or exposed shorelines. For off-shore applications, turbines will generally be visible from the shoreline as transmission line limitations and ocean depths will dictate how far from shore these projects can be located. In the longer run, off-shore wind farms may be able to move to even windier locations farther off-shore, based on the experience gained from installations nearer to shore.

354

Identifying opportunities and obstacles for the use of solar energy in commercial office buildings in the northeastern region of united states.  

E-Print Network [OSTI]

??The aim of this research was to find the existing challenges to and opportunities for the use of solar energy, in commercial office buildings in (more)

Mathew, Anju Ann

2010-01-01T23:59:59.000Z

355

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]

~ o ~ e ~ ~ ~ ~ o ~ ~ 1, OrraCitlg o ~ * ~ ~ ~ o ~ ~ e e ~ e ~ ~ e ~ X 8 8 tiO r1laV8 ~ e e ~ ~ ~ e ~ ~ ~ ~ e ~ ~ ~ ~ ~ ~ ~ X Gout our ' arBlitlg GOVBr CrOPPIZlg e ~ o ~ e ~ ~ ~ ~ ~ ~ ~ ~ e o ~ ~ ~ X befal~c graaiug I'er iii7latiou ~ ~ i e... ~ o ~ e ~ ~ ~ ~ o ~ ~ 1, OrraCitlg o ~ * ~ ~ ~ o ~ ~ e e ~ e ~ ~ e ~ X 8 8 tiO r1laV8 ~ e e ~ ~ ~ e ~ ~ ~ ~ e ~ ~ ~ ~ ~ ~ ~ X Gout our ' arBlitlg GOVBr CrOPPIZlg e ~ o ~ e ~ ~ ~ ~ ~ ~ ~ ~ e o ~ ~ ~ X befal~c graaiug I'er iii7latiou ~ ~ i e...

Boykin, Calvin C

2012-06-07T23:59:59.000Z

356

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.

357

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

358

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

359

Thread-leaf Blue Star Amsonia hubrichtii  

E-Print Network [OSTI]

-20 inches tall. Upright. 8-14 inches tall. HABIT Early flowering. Light blue star- shaped flowers. Fine perennial for the right place. Right Perennial, Right Place Cornell University Department of Horticulture

360

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

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

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

362

nature physics | VOL 6 | JULY 2010 | www.nature.com/naturephysics 477 All in the mind  

E-Print Network [OSTI]

on complex relationships between words. Perhaps you have a pet, a chihuahua, and he's a rather big one; he's a tall chihuahua. All chihuahuas are, of course, dogs, so if your chihuahua is furry, he's also a furry dog. Likewise, a hungry chihuahua would be a hungry dog. Yet a tall chihuahua is not a tall dog

Loss, Daniel

363

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]

Page Transect paths of the submersible DIAPHUS across Stetson Bank. . . . . . . . . . . . . ~ ~ 7 Respective locations of Stetson Bank and the . East and West Flower Gardens . . ~ ~ ~ . . . ~ . 15 The distribution of average salinities (PPT... submersible DIAPHUS, was concerned with a general base- line survey of Stetson Bank on a contrac from Signal Oil Company The objectives of the survey were: 1) to describe the benthic com- munities in terms of the predominant epifaunal macrobenthos; 2...

DuBois, Random

2012-06-07T23:59:59.000Z

364

The Brown Dwarf Kinematics Project (BDKP). II. Details on Nine Wide Common Proper Motion Very LowMass Companions to Nearby Stars  

E-Print Network [OSTI]

We report on nine wide common proper motion systems containing late-type M, L, or T companions. We confirm six previously reported companions, and identify three new systems. The ages of these systems are determined using ...

Faherty, Jacqueline K.

365

Discovery of the Closest Brown Dwarf to the Sun? A Methane Rich Brown Dwarf around the Nearby M8.5 Star SCR 1845-6357  

E-Print Network [OSTI]

This paper was accidentally submitted twice to astro-ph. This version has been withdrawn -- please see astro-ph/0601440 instead.

B. A. Biller; M. Kasper; L. M. Close; W. Brandner; S. Kellner

2006-01-19T23:59:59.000Z

366

Infrared 34 ?m Spectroscopy of Nearby PG QSOs and AGNNuclear Starburst Connections in High-Luminosity AGN Populations  

Science Journals Connector (OSTI)

......Imase (2010), and (2) the nuclear-starburst-to-AGN luminosity...The hypothesis that the nuclear-starburst-to-AGN luminosity...with our currently available dataset. Fig. 5. The ordinate is the nuclear 3.3 m PAH emission luminosity......

Masatoshi Imanishi; Kohei Ichikawa; Tomoe Takeuchi; Nozomu Kawakatu; Nagisa Oi; Keisuke Imase

2011-03-25T23:59:59.000Z

367

The NuSTAR View of Nearby Compton-thick AGN: The Cases of NGC 424, NGC 1320 and IC 2560  

E-Print Network [OSTI]

We present X-ray spectral analyses for three Seyfert 2 active galactic nuclei, NGC 424, NGC 1320, and IC 2560, observed by NuSTAR in the 3-79 keV band. The high quality hard X-ray spectra allow detailed modeling of the Compton reflection component for the first time in these sources. Using quasi-simultaneous NuSTAR and Swift/XRT data, as well as archival XMM-Newton data, we find that all three nuclei are obscured by Compton-thick material with column densities in excess of ~5 x $10^{24}$ cm$^{-2}$, and that their X-ray spectra above 3 keV are dominated by reflection of the intrinsic continuum on Compton-thick material. Due to the very high obscuration, absorbed intrinsic continuum components are not formally required by the data in any of the sources. We constrain the intrinsic photon indices and the column density of the reflecting medium through the shape of the reflection spectra. Using archival multi-wavelength data we recover the intrinsic X-ray luminosities consistent with the broadband spectral energy ...

Balokovi?, M; Harrison, F A; Alexander, D M; Ballantyne, D R; Bauer, F E; Boggs, S E; Brandt, W N; Brightman, M; Christensen, F E; Craig, W W; Del Moro, A; Gandhi, P; Hailey, C J; Koss, M; Lansbury, G B; Luo, B; Madejski, G M; Marinucci, A; Matt, G; Markwardt, C B; Puccetti, S; Reynolds, C S; Risaliti, G; Rivers, E; Stern, D; Walton, D J; Zhang, W W

2014-01-01T23:59:59.000Z

368

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

369

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

370

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

371

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

372

Download - American Society of Limnology and Oceanography  

Science Journals Connector (OSTI)

Jul 11, 1995 ... solvent is used, and the interference of the excited states of ..... pecially from green and blue-green algae (Talling and Driver. 1961). We were...

373

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...

374

Demographic responses to fire of Spartina argentinensis in temporary flooded grassland of Argentina  

Science Journals Connector (OSTI)

Population characteristics of Spartina argentinensis after fire were analyzed. Field experiments were done in temporary flooded tall grassland, dominated by S. argentinensis at the Reserva Federico Wildermuth (Ar...

Susana R. Feldman; Juan Pablo Lewis

2007-12-01T23:59:59.000Z

375

E-Print Network 3.0 - automotive structural applications Sample...  

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

ASRANet Conference Summary: and offshore structures, tall buildings, masts and towers, pipelines, automotive, Nuclear Structures... Call for Papers 6th International...

376

Microsoft Word - CF-Radio-Comm-Upgrades-CX.doc  

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

include construction of 25-foot tall radio towers and antenna systems within each of the BPA substations listed above. All of the proposed ground disturbing activities would take...

377

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...

378

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...

379

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:...

380

E-Print Network 3.0 - amethyst trial substudy Sample Search Results  

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

Engineering 36 School of Earth and Space Exploration Points of Interest Summary: -pit and underground mines, a gemstone exhibit and a 6-foot tall amethyst geode at the...

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

H  

Science Journals Connector (OSTI)

Fundamentals of limnology,. 3rd ed. Univ. Toronto. TALLING, J. F. 1965. ... terrestrial environments, yet one does not normally manage a forest by its ( primary).

2000-01-04T23:59:59.000Z

382

E-Print Network 3.0 - acute hypersensitivity reactions Sample...  

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

to locate... rearrangements and chromosomal translocations observed in human T-cell acute lymphoblastic leukemia (T-ALL) often Source: Ecole Polytechnique, Centre de...

383

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...

384

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

385

Micro/Nano-Scale Phase Change Systems for Thermal Management and Solar Energy Conversion Applications  

E-Print Network [OSTI]

obstacles and satisfy the needs of load leveling, new effective technologies for long term solar energy

Coso, Dusan

2013-01-01T23:59:59.000Z

386

Towards Event-Aware Adaptive Sampling Using Static and Mobile Nodes  

E-Print Network [OSTI]

obstacles to solar radiation. NIMS systems have exploited this and have been deployed with battery energy

2004-01-01T23:59:59.000Z

387

Call and Response: Experiments in Sampling the Environment  

E-Print Network [OSTI]

obstacles to solar radiation. NIMS systems have exploited this and have been deployed with battery energy

2004-01-01T23:59:59.000Z

388

Deriving cloud velocity from an array of solar radiation measurements  

E-Print Network [OSTI]

Solar Energy Test Bed (UCSD- SETB). The sensors were placed onto an exposed rooftop without obstacles

Bosch, J.L.; Zheng, Y.; Kleissl, J.

2013-01-01T23:59:59.000Z

389

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

390

Holocene vegetation and land-use dynamics in the karstic environment of Inis O??rr, Aran Islands, western Ireland: pollen analytical evidence evaluated in light of the archaeological record  

Science Journals Connector (OSTI)

A detailed Holocene pollen record, elaborated in the project TIMECHS, is presented from An Loch Mr, a deep lake at the north-eastern end of Inis O??rr, Aran Islands, western Ireland. Woodland development in the early Holocene is broadly comparable, as regards the general sequence of tree spread and overall woodland composition, to that known from mainland sites in the nearby Burren and Connemara. The main trees in the early Holocene woodlands were Quercus, Pinus and Ulmus. Corylus and a variety of tall shrubs including Betula, Juniperus, Rhamnus catharticus, Ilex, Viburnum opulus and Sorbus had an important role. Taxus expanded and attained dominance for a short period in the later Neolithic and then persisted in small numbers until at least the beginning of the early Medieval period (late 6th century AD). Other notable features included substantial opening-up of woodland cover prior to the Elm Decline, a well-defined Landnam in the early Neolithic (after the Elm Decline), considerable though varying human impact throughout the Bronze Age and continuing into the Iron Age, a distinct regeneration phase that involved regeneration of woody plantsmainly Juniperus, Corylus and Taxusin the late Iron Age, i.e. the so-called Late Iron Age Lull, and renewed farming activity in the early Medieval period with Secale being introduced in the early 8th century AD. The final demise of woodlands took place between the 13th and the beginning of the 16th centuries though minor amounts of woody vegetation probably persisted on Inis O??rr until at least the late 18th century. The palynological record is discussed in the light of the available archaeological and historical information, and with particular reference to the recently completed archaeological excavations at Dn Aonghasa, the largest stone fort on the Aran Islands.

Karen Molloy; Michael OConnell

2004-01-01T23:59:59.000Z

391

CITY OF SANTA FE V. KOMIS REVISITED: AN ANALYSIS OF THE ACTUAL IMPACTS OF CONSTRUCTION AND OPERATION OF THE SANTA FE BYPASS ON THE VALUE OF NEARBY REAL ESTATE  

SciTech Connect (OSTI)

The Santa Fe Bypass for transport of transuranic waste (TRU) to the Waste Isolation Pilot Plant (WIPP) near Carlsbad, New Mexico has been constructed and is operational (as of 2000). This paper presents a review of actual empirical data from the sales of real estate in the Santa Fe City/County area since the filing of the City of Santa Fe v. Komis lawsuit in 1988. The data analyzed covers the time period from 1989 through the last quarter of 2001.

Bentz, Dr. E. J., Jr.,; Bentz, C. B.; O'Hora, T. D.; Baepler, Dr. D.

2003-02-27T23:59:59.000Z

392

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.

393

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.

394

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

395

Two Suicidal Fatalities Due to the Ingestion of Chlorfenvinphos Formulations: Simultaneous Determination of the Pesticide and the Petroleum Distillates in Tissues by Gas ChromatographyFlame-Ionization Detection and Gas ChromatographyMass Spectrometry  

Science Journals Connector (OSTI)

......multiple containers containing automobile products nearby. The stomach...brake fluid, oil, and other automobile products nearby. The autopsy...were homogenized using an electric mixer blender model Ultraturrax...multiple containers containing automobile products nearby. The stomach......

Mara A. Martnez; Salom Ballesteros

2012-01-01T23:59:59.000Z

396

Modeling needs for very large systems.  

SciTech Connect (OSTI)

Most system performance models assume a point measurement for irradiance and that, except for the impact of shading from nearby obstacles, incident irradiance is uniform across the array. Module temperature is also assumed to be uniform across the array. For small arrays and hourly-averaged simulations, this may be a reasonable assumption. Stein is conducting research to characterize variability in large systems and to develop models that can better accommodate large system factors. In large, multi-MW arrays, passing clouds may block sunlight from a portion of the array but never affect another portion. Figure 22 shows that two irradiance measurements at opposite ends of a multi-MW PV plant appear to have similar irradiance (left), but in fact the irradiance is not always the same (right). Module temperature may also vary across the array, with modules on the edges being cooler because they have greater wind exposure. Large arrays will also have long wire runs and will be subject to associated losses. Soiling patterns may also vary, with modules closer to the source of soiling, such as an agricultural field, receiving more dust load. One of the primary concerns associated with this effort is how to work with integrators to gain access to better and more comprehensive data for model development and validation.

Stein, Joshua S.

2010-10-01T23:59:59.000Z

397

Changes in the surface energy budget after fire in boreal ecosystems of interior Alaska: An annual perspective  

E-Print Network [OSTI]

than in nearby mature conifer forests [Amiro, 2001; Chambersthe boreal forest with a mature, unburned conifer vegetationforests is often much higher than in nearby conifer

Liu, Heping; Randerson, J. T; Lindfors, J.; Chapin, F. S

2005-01-01T23:59:59.000Z

398

Alternative Energy Development and China's Energy Future  

E-Print Network [OSTI]

energy industries, particularly solar PV and turbine manufacturers, from 2005 to 2009 presented unexpected challenges and obstacles

Zheng, Nina

2012-01-01T23:59:59.000Z

399

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.

400

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.

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

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.

402

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

403

Fighting Terrorism or Red Tape?  

Science Journals Connector (OSTI)

A Florida optics company encounters an unexpected obstacle in its attempt to market a spectrometry-based anthrax detection device.

Douglass, Kim

2003-01-01T23:59:59.000Z

404

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.

405

E-Print Network 3.0 - assembly building oab Sample Search Results  

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

Technologies and Information Sciences ; Engineering 3 Independent Navigation of Multiple Mobile Robots with Hybrid Reciprocal Velocity Obstacles Summary: their trajectories...

406

The Story of Secretary Wang: Hero, Savior, Liar, Scoundrel  

E-Print Network [OSTI]

at a nearby hydroelectric station. Moves like campaign. The entire hydroelectric bureau, by

Oakes, Tim

2005-01-01T23:59:59.000Z

407

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

408

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

409

Interferometric observations of large biologically interesting interstellar and cometary molecules  

Science Journals Connector (OSTI)

...chemistry to the solar system can...methanol. Major obstacles to understanding...had enough energy to knock off...stars (>10 solar masses...activation energy to overcome...However, a major obstacle to observational...chemistry to the solar system can...methanol. Major obstacles to understanding...

Lewis E. Snyder

2006-01-01T23:59:59.000Z

410

Molecular Characterization of New Melanoma Cell Lines from C3H Mice Induced by Ethanol plus Ultraviolet Radiation  

Science Journals Connector (OSTI)

...78550 R. P. P. A major obstacle in understanding the...4 , 5) . But whereas solar UV exposure is clearly...is essential. A major obstacle to understanding the...Twinsburg, OH). The energy emitted from these lamps...radiation. | A major obstacle in understanding the...

Faith M. Strickland; Sen Pathak; Asha S. Multani; Ronald P. Pelley; and Cherrie K. Donawho

2003-07-01T23:59:59.000Z

411

Humans exploit the biomechanics of bipedal gait during visually guided walking over complex terrain  

Science Journals Connector (OSTI)

...complex terrain such as a rocky trail? Recent research...of human walking over flat, obstacle-free terrain...efficiency of human walking in flat, obstacle-free environments...complex terrain such as a rocky trail. In this study...efficiency of human walking in flat, obstacle-free environments...

2013-01-01T23:59:59.000Z

412

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

413

Effect of grid size on building wind according to a computation fluid dynamics simulation  

Science Journals Connector (OSTI)

Skyscrapers negatively impact the environment by creating gusty winds, known as building winds, which are the result of descending turbulences ... air by tall buildings. Usually, a building wind impact assessment...

Jae-Cheol Kim; Kyoo-Seock Lee

2011-02-01T23:59:59.000Z

414

Behavior of a Nuclear Power Plant Ventilation Stack for Wind Loads  

Science Journals Connector (OSTI)

This paper describes behavior of self supporting tall reinforced concrete (RC) ventilation stack of a nuclear power plant (NPP) for wind loads. Since the static and equivalent dynamic wind loads are inter-dependa...

V. Venkatachalapathy

2012-05-01T23:59:59.000Z

415

Branch xylem density variations across the Amazon Basin  

E-Print Network [OSTI]

C. Penuela and E. Alvarez SW-Venezuela SCR-01 Terra firme R.Herrera SW-Venezuela SW-Venezuela SCR-04 SCR-05 Tall caatinga Terra firme R. Herrera R. Herrera

2009-01-01T23:59:59.000Z

416

US ITER | Media Corner  

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

one of the world's largest and most powerful electromagnets to energize the ITER tokamak, a device that confines plasma in the shape of a doughnut. The 13 meter tall central...

417

Effects of the Arundo donax L. on Hydrological Regime of the Rio Grande Basin  

E-Print Network [OSTI]

This study investigated the role of an invasive tall cane, Arundo donax L. (Arundo), in the riparian water cycle. Four 100 meter transects were arrayed perpendicular to the lower Rio Grande in southwest Texas. The first objective was to determine...

Li, Fan

2012-07-16T23:59:59.000Z

418

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

419

Rheological Modification of Lubricating Greases with Recycled Polymers from Different Plastics Waste  

Science Journals Connector (OSTI)

Rheological Modification of Lubricating Greases with Recycled Polymers from Different Plastics Waste ... Tall, S.; Albertsson, A. C.; Karlsson, S. Recycling of Mixed Plastic Fractions: Mechanical Properties of Multicomponent Extruded Polyolefin Blends Using Response Surface Methodology J. Appl. ...

J. E. Martn-Alfonso; C. Valencia; M. C. Snchez; J. M. Franco; C. Gallegos

2009-03-12T23:59:59.000Z

420

Supporting Information 10.1002/bies.200900102  

E-Print Network [OSTI]

., Chloroplast DNA variation and the recent radiation of the giant senecios (Asteraceae) on the tall mountains biotas. Systematic Biology 2003. 52: 757- 780. Yucca moths 30-40 Pellmyr, O. and Krenn H. W., Origin

Olson, Mark

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

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 (CONTD) Hey, Cell Phone. Put the Blackberry

Carnick, Michael

2012-01-01T23:59:59.000Z

422

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...

423

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

424

Energy Efficiency Evaluation of Guangzhou West Tower Faade System  

E-Print Network [OSTI]

Guangzhou West Tower is an extremely tall public building. The energy efficiency evaluation of its faade 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

425

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

426

CAMD Research Highlights  

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

less than 1m over a process area of 80mm for 1mm tall structures. A broad process window was demonstrated, which can be used to fine-tune the sidewall verticality as well...

427

Arthropod and plant responses to resource availability and heterogeneity  

E-Print Network [OSTI]

(Melilotus alba), tall thistle (Cirsium altissimum), and rough-leaved dogwood (Cornus drummondii). The site was prepared by disking and tilling to remove existing vegetation. Six native tallgrass prairie species were seeded into the plots: big...

Khavin, Irene Samantha

2008-03-26T23:59:59.000Z

428

US ITER | Media Corner  

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

of Wisconsin. Superconducting strand is cabled at New England Wire Technologies on 2.5 meter wide by 2 meter tall spools before shipment to Florida for conductor jacketing. Photo:...

429

Sandia National Laboratories: Concentrating Solar Power (CSP...  

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

of three 459-ft-tall power towers and over 170,000 reflective heliostats with a rated capacity of 390 MW. The California Energy Commission (CEC) has received numerous pilot and air...

430

Sandia National Laboratories: Recent Solar Highlights  

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

of three 459-ft-tall power towers and over 170,000 reflective heliostats with a rated capacity of 390 MW. The California Energy Commission (CEC) has received numerous pilot and air...

431

Life cycle assessment of energy and GHG emissions during ethanol production from grass straws using various pretreatment processes  

Science Journals Connector (OSTI)

The aim of this study was to perform a well-to-pump life cycle assessment (LCA) to investigate the overall net energy balance and environmental impact of bioethanol production using Tall Fescue grass straw as fee...

Deepak Kumar; Ganti S. Murthy

2012-05-01T23:59:59.000Z

432

Relationships between climate, vegetation, and energy exchange across a montane gradient  

E-Print Network [OSTI]

and tall canopy (conifer forest) ecosystems. We believe thatin mixed?conifer sub?alpine forests, Ecohy- drology, 2, 129Forest (MedChap or MC) Mixed Chaparral, Live oak, and Conifer (

Anderson, Ray G.; Goulden, Michael L.

2011-01-01T23:59:59.000Z

433

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

434

Identification of a 98-kb DNA segment containing the rice Eui gene controlling uppermost internode elongation, and construction of a TAC transgene sublibrary  

Science Journals Connector (OSTI)

The recessive tall rice phenotype associated with the mutation eui (elongated upper-most internode) is an important agronomic trait that has been introduced into hybrid rice to eliminate panicle enclosure in al...

Y.-H. Xu; Y.-Y. Zhu; H.-C. Zhou; Q. Li; Z.-X. Sun

2004-09-01T23:59:59.000Z

435

A novel semidwarf mutant 02428ha in rice is caused by reduced gibberellin sensitivity  

Science Journals Connector (OSTI)

The rice (Oryza sativa L.) elongated uppermost internode (eui) gene effectively results in a recessive tall plant type. In eui background, we found a mutant 02428ha that exhibited a semidwarf phenotype. Because s...

Suobing Zhang; Renxiao Chen; Ling Zhao; Zhen Zhu

2011-01-01T23:59:59.000Z

436

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.

437

High-Temperature Stress Relaxation Cracking and Stress Rupture Observed in a Coke Gasifier Failure  

Science Journals Connector (OSTI)

This article discusses the high-temperature metal degradation mechanisms that occurred in the failure of a nine-story tall coke gasifier, located in a refinery power plant. Cracking of gasifier internals, bulging...

Daniel J. Benac; Douglas B. Olson

2011-06-01T23:59:59.000Z

438

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

439

Advanced Combustion Concepts - Enabling Systems and Solutions...  

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

ins talled and vehicle available for application, emis s ion and fuel economy optimization. 5 G as oline S ys tems | 5172013 | 2013 R obert B os ch LLC and affiliates ....

440

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...

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

NREL: Continuum Magazine - R&D 100 Awards Demonstrate Clean Energy...  

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

casually next to a rectangular box about 10 feet tall and at least 20 feet long, with an image of a Peregrine falcon and mountains emblazoned on it. Energy Secretary Ernest Moniz...

442

Emancipatory Digital Archaeology  

E-Print Network [OSTI]

photograph taken of a teapot at Tall Dhiban in Jordan, a35 4 Tempest in a digital teapot 40 History of Photographydigital photograph of a teapot. Yet this photograph exhibits

Morgan, Colleen

2012-01-01T23:59:59.000Z

443

Chapter 9 -Irrigation Equipment Safety The following suggestions are aimed at ensuring the safety of the irrigator as well as  

E-Print Network [OSTI]

pipeline. 7. To perform overhead maintenance, use a ladder that is sufficiently tall as well as stable. 8. Have qualified service personnel perform any hazardous repair or maintenance. 9. Keep all guards

444

Solar Thermal Power Generation and Industrial Process Heat  

Science Journals Connector (OSTI)

A solar chimney power plant consists of a transparent tubular chimney over 200m tall rising from a...2 covered with a transparent material (Haaf et al. 1983). At the base of the chimney is located a turbine driv...

Brian Norton

2014-01-01T23:59:59.000Z

445

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

446

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

447

E-Print Network 3.0 - absorbing galaxies imaging Sample Search...  

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

MID-UV IMAGING OF NEARBY GALAXIES Rogier A. Windhorst, Violet A. Taylor, and Rolf A. Jansen Summary: HST MID-UV IMAGING OF NEARBY GALAXIES Rogier A. Windhorst, Violet A. Taylor,...

448

The seismic velocity structure of some NE Atlantic continental rise sediments; a lithification index?  

Science Journals Connector (OSTI)

......indicates a large downward increase...nearby Deep Sea Drilling Project (DSDP) borehole where it is...of the Ocean Drilling Program, Part...indicates a large downward increase...nearby Deep Sea Drilling Project (DSDP) borehole where it is......

R. B. Whitmarsh; P. R. Miles; L. M. Pinheiro

1990-05-01T23:59:59.000Z

449

Implicitely and Densely Discrete Black-Box Optimization Problems  

E-Print Network [OSTI]

Sep 26, 2008 ... to allowable figures or by 'projecting' them to nearby values or grid ... in this paper

2008-09-26T23:59:59.000Z

450

8798_FL  

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

The Movie . . . . . . . . . . . . . . . . . 8 Simulation Matches Historic Gamma-Ray Burst. . . . . . . . . . . . . . . . 11 Nearby Supernova Factory Churns Out Discoveries...

451

Strategies for International Cooperation in Support of Energy...  

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

... 6 Figure 5. Biomass gasifier that uses residue from the nearby sugarcane mill-Maui, Hawaii ...... 8 Figure 6. WTE...

452

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

453

Exploration of Resource and Transmission Expansion Decisions in the Western Renewable Energy Zone Initiative  

E-Print Network [OSTI]

of nearby solar, geothermal, and wind energy resources toenergy demand. Solar energy is the second largest resource,

Mills, Andrew D

2011-01-01T23:59:59.000Z

454

July 2005 1 Data Dictionary for  

E-Print Network [OSTI]

to a local place name or nearby geographic feature. Site Code Unique identifier previously used in the BCD

455

Reform or Radicalism: Left Social Movements from the Battle of Seattle to Occupy Wall Street  

E-Print Network [OSTI]

and deflect the turbulent flood of popular courage manageda mailroom nearby for the flood of donated goods. 81 Finally

Rowe, James K; Carroll, Myles

2014-01-01T23:59:59.000Z

456

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

457

E-Print Network 3.0 - antimatter Sample Search Results  

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

Deep Underground Summary: % Anti-Matter 0% stars baryon neutrinos dark matter dark energy "The deficit poses a significant obstacle... ? Did neutrinos form galaxies? ...

458

E-Print Network 3.0 - antimatter driven p-b11 Sample Search Results  

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

Deep Underground Summary: % Anti-Matter 0% stars baryon neutrinos dark matter dark energy "The deficit poses a significant obstacle... ? Did neutrinos form galaxies? ...

459

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...

460

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...

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

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...

462

PUBLISHED ONLINE: 17 JANUARY 2010 | DOI: 10.1038/NPHYS1508 Self-organized adaptation of a simple neural  

E-Print Network [OSTI]

Neuroscience, 37073 Göttingen, Germany, 2Department of Solar Energy, Institute for Solid State Physics, ISFH (several different gaits, climbing, turning, grooming, orienting, obstacle avoidance, attraction, flight

Loss, Daniel

463

Home Buy Online Sell Online Services Jobs News & Community Sign In Tools Articles E-mail RSS  

E-Print Network [OSTI]

Downloads National Semiconductor Enters Photovoltaic Market With Technology That Maximizes Solar Energy have overcome a major obstacle in producing transistors from networks of carbon nanotubes, a technology

Rogers, John A.

464

Day-Ahead Solar Resource Prediction Method Using Weather Forecasts for Peak Shaving.  

E-Print Network [OSTI]

??Due to recent concerns about energy sustainability, solar power is becoming more prevalent in distributed power generation. There are still obstacles which need to be (more)

Greenwood, Wesley

2014-01-01T23:59:59.000Z

465

robots  

National Nuclear Security Administration (NNSA)

simulations including searching vehicles for explosive devices, recovery of a stolen weapon, navigating obstacle courses and dealing with suicide bombers.

See photos from...

466

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'...

467

Investigating the feasibility of growing algae for fuel in southern Nevada.  

E-Print Network [OSTI]

??Microalgae capable of growing in waste are adequate to be mass-cultivated for biodiesel, avoiding fertilizers and clean water, two obstacles to sustainability of the feedstock (more)

Moazeni, Faegheh

2013-01-01T23:59:59.000Z

468

DE-FC26-02NT41318 | netl.doe.gov  

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

designed to be sensitive to metallic, plastic, or ceramic obstacles embedded in the soil. Background: The use of guided directional drilling for the installation of gas services...

469

England shows the way for members to tackle Fifa crisis Published: June 1 2011 03:18 | Last updated: June 1 2011 03:18  

E-Print Network [OSTI]

. The biggest obstacle to reform of Fifa is likely not its independence from mechanisms of accountability other international organisations, Fifa is unlikely to see constructive reforms unless participating

Stowell, Michael

470

Phoenix Overcomes Barriers and Energizes Homeowners to Make Upgrades...  

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

which caused confusion about program eligibility and made it difficult to conduct advertising. Other obstacles in the community include language barriers and a lack of energy...

471

E-Print Network 3.0 - anchored retaining wall Sample Search Results  

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

victim to errors caused by obstacles. An ... Source: Sadeh, Norman M. - Institute for Software Research & School of Computer Science, Carnegie Mellon University Collection:...

472

Albany, OR * Anchorage, AK * Morgantown...  

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

thus addressing primary obstacles to rapid CCUS deployment. * Developing a self-sustaining CCUS training program through an active sponsorship program and appropriately...

473

E-Print Network 3.0 - avoidance learning Sample Search Results  

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

; Computer Technologies and Information Sciences 40 Effective Reinforcement Learning for Mobile Robots Summary: policy (for cor- ridor following) or constant (for obstacle...

474

Body with mirror surface and connected interior invisible from one point  

E-Print Network [OSTI]

Here we demonstrate existence of a piecewise smooth obstacle having connected interior and invisible from a point in the framework of geometric optics.

Alena Aleksenko

2014-05-09T23:59:59.000Z

475

Using perturbed resonant frequencies to study eigenmodes of an acoustic resonator  

Science Journals Connector (OSTI)

A simple experiment is described which is based on the notion that the resonant frequency of an eigenmode is shifted if an obstacle is introduced into an acoustic resonator. The shift depends on the shape and volume of the obstacle and on the nature of the acoustic field which previously existed in the space occupied by the obstacle. It is shown that a spherical obstacle made from a set of parallel disks can be used to evaluate both the intensity and direction of motion of the vibrations in the resonator. The relevance of the method to other fields of physics is also indicated.

F. L. Curzon; D. Plant

1986-01-01T23:59:59.000Z

476

Technology Validation | Department of Energy  

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

design, and development, there are obstacles to successful implementation of fuel cells and the corresponding hydrogen infrastructure that can be addressed only by...

477

Journal of Applied Sciences Research, 8(1): 448-453, 2012 ISSN 1819-544X  

E-Print Network [OSTI]

Blades, Efficiency Turbine. Introduction Recently, micro hydro become attractive because of its clean high production costs with a complex structure are the biggest obstacles to develop micro hydro

Paris-Sud XI, Université de

478

EFFECT OF NITROGEN OXIDE PRETREATMENTS ON ENZYMATIC HYDROLYSIS OF CELLULOSE  

E-Print Network [OSTI]

Bioconversion of Cellulose and Production of Ethanol," LBL-of Cellulose and the Production of Ethanol," LBL-6859,the cellulose is a major obstacle to hydrolysis. Ethanol The

Borrevik, R.K.

2011-01-01T23:59:59.000Z

479

Diffraction phase microscopy: principles and applications in materials and life sciences  

Science Journals Connector (OSTI)

The main obstacle in retrieving quantitative phase with high sensitivity is posed by the phase noise due to mechanical vibrations and air fluctuations that typically affect any...

Bhaduri, Basanta; Edwards, Chris; Pham, Hoa; Zhou, Renjie; Nguyen, Tan H; Goddard, Lynford L; Popescu, Gabriel

2014-01-01T23:59:59.000Z

480

The Potential for Transatlantic Cooperation on Intellectual Property in Asia.  

E-Print Network [OSTI]

The Potential for Transatlantic Cooperation on Intellectualthey should be applied. Transatlantic efforts to harmonizeproblem. The obstacle to transatlantic cooperation in Asia

Callan, Benedicte

1998-01-01T23:59:59.000Z

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

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

482

Accuracy Analysis of a Robotic Radionuclide Inspection and Mapping System for Surface Contamination  

SciTech Connect (OSTI)

The mapping of localized regions of radionuclide contamination in a building can be a time consuming and costly task. Humans moving hand-held radiation detectors over the target areas are subject to fatigue. A contamination map based on manual surveys can contain significant operator-induced inaccuracies. A Fanuc M16i light industrial robot has been configured for installation on a mobile aerial work platform, such as a tall forklift. When positioned in front of a wall or floor surface, the robot can map the radiation levels over a surface area of up to 3 m by 3 m. The robot's end effector is a commercial alpha-beta radiation sensor, augmented with range and collision avoidance sensors to ensure operational safety as well as to maintain a constant gap between surface and radiation sensors. The accuracy and repeatability of the robotically conducted contamination surveys is directly influenced by the sensors and other hardware employed. This paper presents an in-depth analysis of various non-contact sensors for gap measurement, and the means to compensate for predicted systematic errors that arise during the area survey scans. The range sensor should maintain a constant gap between the radiation counter and the surface being inspected. The inspection robot scans the wall surface horizontally, moving down at predefined vertical intervals after each scan in a meandering pattern. A number of non-contact range sensors can be employed for the measurement of the gap between the robot end effector and the wall. The nominal gap width was specified as 10 mm, with variations during a single scan not to exceed {+-} 2 mm. Unfinished masonry or concrete walls typically exhibit irregularities, such as holes, gaps, or indentations in mortar joints. These irregularities can be sufficiently large to indicate a change of the wall contour. The responses of different sensor types to the wall irregularities vary, depending on their underlying principles of operation. We explored capacitive, ultrasound, and optical Laser range sensors. The unshielded capacitive range sensors were found to be influenced by objects in their vicinity, and to have comparatively low sensitivity. Therefore they were not used for gap measurement. We did, however, use them successfully to detect obstacles in the field of motion of the sensor head. The four sensors pointing diagonally from four corners of the sensor head are capacitive range sensors, which stop the robot motion any time a pre-set threshold signal level is exceeded. Ultrasound range sensors were found to have good resolution. The ultrasound beam was frequently deflected sideways by the wall's roughness, resulting in a spurious signal peaks. On the other hand, ultrasound signals are inherently insensitive to variations of the optical surface properties. Laser range sensing proved to be generally less noisy than ultrasound measurements. The aforementioned sensitivity to the target surface's optical properties was not evident on grey, non-reflective surfaces. On such surfaces, laser range sensing was found to be superior to ultrasound measurements. Occasionally, however, surface reflectivity and specularity caused erroneous measurements. The computational burden of measuring and filtering the sensor data in real time made it impractical to control the robot directly based on sensor feedback. The robot performs a first horizontal surface range scan merely to gage the surface profile. During the subsequent passes, the robot records the radiation measurements, while recording the range data for the next pass, with the range sensor positioned below the radiation sensor. The decoupling of measurements from robot control prevents the robot controller from responding to spurious sensor signals, ensuring steadier and safer radiation surveying. The controller is configured to accept either optical or ultrasound range signals, so as to respond better to user-specific requirements. A detailed analysis of non-contact range sensors and control for the automated mapping of surface contamination has been presented. The C

Mauer, Georg F.; Kawa, Chris [Department of Mechanical Engineering, University of Nevada, Las Vegas, NV 89154-4027 (United States)

2008-01-15T23:59:59.000Z

483

A review of "Drama and the Performing Arts in Pre-Cromwellian Ireland: A Repertory of Sources and Documents from the Earliest Times Until c. 1642." by Alan J. Fletcher  

E-Print Network [OSTI]

among the Irish State Papers in the Public Record Office in London describing the vandalism of a statue by Sir Brian O?Rourke and his men. According to one document: . . . O reworcke found an Image of a [tall] tall woman and wroate vpon the brest...). The other documents in Sir Brian O?Rourke?s ?trayterous pagent? (6.3) support the above statement. Not all performing artists were designated as such, neither O?Rourke nor his men were entertainers in the true sense, though they could easily be classified...

Kay J. Blalock

2004-01-01T23:59:59.000Z

484

A field guide to the trees, shrubs, and woody vines of Tamborwood, Newton County, Texas  

E-Print Network [OSTI]

. White-tailed deer browse the foliage. 37 ~j)Sr Fig. 13. Baldcygress Fig. 14. Eastern Redcedar 38 EASTERN COTTONWOOD Populus deltoides Bartr. (Fig. 15) b;o A tree up to 100 feet tall with gray bark separating into wide ridges and roughening.... White-tailed deer browse the foliage. 37 ~j)Sr Fig. 13. Baldcygress Fig. 14. Eastern Redcedar 38 EASTERN COTTONWOOD Populus deltoides Bartr. (Fig. 15) b;o A tree up to 100 feet tall with gray bark separating into wide ridges and roughening...

Holm, Stephen Franke

2012-06-07T23:59:59.000Z

485

The Third Verdict  

E-Print Network [OSTI]

... Note: The full quote is, "No man stands so tall as when he stoops to help a child." Source unknown. PART ONE NO MAN SO TALL "Mr. Scott, are you done with the transporter tests?" The chief engineer of the U. S. S. Enterprise muttered faintly... of the three who commanded the fate of all the rest: Kirk, Spock, and Scott. Scotty nodded wistfully. What was it that the doctor had said the last time they'd had a drink together? "You can't sit down to meals together for years and years without either...

Zuk, Beverly C.

1982-01-01T23:59:59.000Z

486

A Guide for Aging Scaled Quail.  

E-Print Network [OSTI]

WEEKS Spotty; long downy topknot; few scattered contour feathers: tail feathers 1/2' long and even with wing tips at rest; 3 1/2-3%" tall; flies short distances. 3 WEEKS Spotty; scattered contour feath ers; topknot 1/2 filled with con tour... feathers; tail feathers %" long and extending '/?-1/2' past wing tip at rest; first four juvenal primaries nearly grown; 33!.-4" tall; flies quite well. 4 5 4 WEEKS Juvenal contour feathers pre dominate back and sides; downy feathers predominate...

Cain, J.R.; Beasom, S.L.

1983-01-01T23:59:59.000Z

487

Design Guidelines for Test Level 3 (TL-3) Through Test Level 5 (TL-5) Roadside Barrier Systems Placed on Mechanically Stabilized Earth (MSE) Retaining Wall  

E-Print Network [OSTI]

Campus. The author also wishes to sincerely thank the Reinforced Earth Company, Mr. Pete Anderson, Mr. Carl Sanders, and Mr. David Hutchinson, for their help on answering many questions and for providing the material for the construction of the full... for MASH TL-4 impact......... 77 Figure 3.10 Enhanced FE tractor-trailer model developed by NTRC (39) ..................... 83 Figure 3.11 MASH TL-5 FE model for the 42 in. (1.07 m) tall barrier and the tall vertical wall...

Saez Barrios, Deeyvid 1980-

2012-12-05T23:59:59.000Z

488

Planning Near-Optimal Corridors Amidst , Jur van den Berg2  

E-Print Network [OSTI]

Planning Near-Optimal Corridors Amidst Obstacles Ron Wein1 , Jur van den Berg2 , and Dan Halperin1 and Computing Sciences, Utrecht University berg@cs.uu.nl Abstract. Planning corridors among obstacles has arisen. Wein, J. van den Berg, and D. Halperin We would therefore like to indicate the global direction

van den Berg, Jur

489

Under consideration for publication in J. Fluid Mech. 1 Force acting on a square cylinder fixed in a  

E-Print Network [OSTI]

. For a subcritical flow, the change in the water depth between upstream and downstream is small and the flow subcritical upstream and downstream of the obstacle. The effect of drag tends to decrease/increase the water depth downstream/upstream of the obstacle

Guillas, Serge

490

SOLAR MODELLING OF COMMERCIAL BUILDINGS Robert Amor, Michael Donn and Ian van der Werff  

E-Print Network [OSTI]

SOLAR MODELLING OF COMMERCIAL BUILDINGS Robert Amor, Michael Donn and Ian van der Werff Energy of modelling the thermal response of buildings. There have been two major obstacles precluding these programs an additional obstacle in the lack of comprehensive weather data files (containing the information required

Amor, Robert

491

Hitting the Highway with Prof. David Shinar  

E-Print Network [OSTI]

and environmental issues that range from water management to solar energy as related to sustainable development insurmountable obstacles that could have resulted in a different outcome. But David Ben-Gurion ­ leader obstacles are different, but no less daunting. The future of education in general and higher education

Yekutieli, Amnon

492

Field theory: Why have some physicists abandoned it?  

Science Journals Connector (OSTI)

...microscopic distances or at energies of a few electron...conceptual and technical obstacles: quantum...actual orbits in the solar system, when appropriate...to overcome these two obstacles only when the models...breaking, which relies on energy differences between...

Roman Jackiw

1998-01-01T23:59:59.000Z

493

Interactions plasmas toile-plante Implications & dtectabilit  

E-Print Network [OSTI]

pour les jupiters chauds · Observations #12;· Kinetic energy flux on obstacle cross-section : Pk ~ NmV2;Flow Obstacle Weakly/Not magnetized (Solar wind) Strongly magnetized (Jovian magnetosphere) Weakly V Robs 2 N=No/d2 No=5 cm-3 m~1.1?mp Solar wind - magnetosphere interaction [Akasofu, 1981, 1982

Demoulin, Pascal

494

Shocks and sheaths in the heliosphere John D. Richardson  

E-Print Network [OSTI]

The solar wind is supersonic, so whenever the wind diverts around an obstacle, whether it be a quasi and compresses the solar wind so that it becomes subsonic and can flow around the obstacle. The regions of solar, and the termination shock and heliosheath. We compare the energy balance across these shocks, fluctuations

Richardson, John

495

Reflected ions at interplanetary shocks J. D. Richardson1  

E-Print Network [OSTI]

. Introduction [2] Shocks are ubiquitous phenomena in the solar wind which produce dramatic changes to the energy distribution of the plasma. Shocks form when the supersonic solar wind encounters an obstacle; the sheath plasma behind the shock is compressed and heated so that it is subsonic and can flow around the obstacle

Richardson, John

496

Space Sci Rev (2008) 139: 311353 DOI 10.1007/s11214-008-9389-1  

E-Print Network [OSTI]

of the interaction between a fast-moving plasma and a relatively slow obstacle in the solar system has been studied. The various obstacles include all of the planets, satellites, comets and asteroids in our solar system Flows The solar wind is a stream of fully ionized plasma, composed of high energy particles (mainly

California at Berkeley, University of

497

Planetary Magnetospheric Philippe Zarka  

E-Print Network [OSTI]

, philippe.zarka@obspm.fr Rencontres de Blois - 2006 · Solar Wind / Solar Wind - Obstacle interaction = magnetosphere MP = magnetopause B = magnetic field · Solar Wind / Solar Wind - Obstacle interaction · Planetary Wind - dominated by bulk energy density : NmV2/2 - carries away solar B rooted in the Sun ! ballerina

Demoulin, Pascal

498

Highly efficient and robust molecular ruthenium catalysts for water oxidation  

Science Journals Connector (OSTI)

...driven by solar radiation (H2O...high-capacity energy carrier. One of the obstacles now is the...sustainable energy systems such as solar fuels, much...driven by solar radiation (H...high-capacity energy carrier. One of the obstacles now is the...

Lele Duan; Carlos Moyses Araujo; Mrten S.G. Ahlquist; Licheng Sun

2012-01-01T23:59:59.000Z

499

Earth Planets Space, 64, 7382, 2012 Solar wind electron interaction with the dayside lunar surface and crustal  

E-Print Network [OSTI]

comes from the energy gained during reflection from a moving obstacle; correctly characterizing electron atmosphere and no global magnetic field, seemingly should present a relatively sim- ple obstacle to the solarEarth Planets Space, 64, 73­82, 2012 Solar wind electron interaction with the dayside lunar surface

California at Berkeley, University of

500

Path planning approach based on flock dynamics of moving particles  

Science Journals Connector (OSTI)

A novel method based on the behaviour of a flock of moving particles is proposed in order to solve the path planning problem of a mobile robot in two-dimensional dynamical sceneries. The mentioned particles search free obstacles zones into the scenery ... Keywords: Autonomous mobile robot, Dynamic environments, Moving obstacles, Navigation, Path planning, Swarm behaviour, Trajectory planning

JesS EspelosN; Leopoldo Acosta; Daniel Alonso

2013-04-01T23:59:59.000Z