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1

Tall Genetics  

NLE Websites -- All DOE Office Websites (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.

2

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

3

The nearby supernova factory  

Science Conference Proceedings (OSTI)

The Nearby Supernova Factory (SNfactory) is an ambitious project to find and study in detail approximately 300 nearby Type Ia supernovae (SNe Ia) at redshifts 0.03 distant SNe searches. In 2002, 35 SNe were found using our test-bed pipeline for automated SN search and discovery. The pipeline uses images from the asteroid search conducted by the Near Earth Asteroid Tracking group at JPL. Improvements in our subtraction techniques and analysis have allowed us to increase our effective SN discovery rate to {approx}12 SNe/month in 2003.

Wood-Vasey, W.M.; Aldering, G.; Lee, B.C.; Loken, S.; Nugent, P.; Perlmutter, S.; Siegrist, J.; Wang, L.; Antilogus, P.; Astier, P.; Hardin, D.; Pain, R.; Copin, Y.; Smadja, G.; Gangler, E.; Castera, A.; Adam, G.; Bacon, R.; Lemonnier, J.-P.; Pecontal, A.; Pecontal, E.; Kessler, R.

2004-01-23T23:59:59.000Z

4

Dynamic interrelationship between technology and architecture in tall buildings  

E-Print Network (OSTI)

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

Moon, Kyoung-Sun

2005-01-01T23:59:59.000Z

5

The nearby supernova factory  

SciTech Connect

The Nearby Supernova Factory (SNfactory) is an ambitious project to find and study in detail approximately 300 nearby Type Ia supernovae (SNe Ia) at redshifts 0.03 < z < 0.08. This program will provide an exceptional data set of well-studied SNe in the nearby smooth Hubble flow that can be used as calibration for the current and future programs designed to use SNe to measure the cosmological parameters. The first key ingredient for this program is a reliable supply of Hubble-flow SNe systematically discovered in unprecedented numbers using the same techniques as those used in distant SNe searches. In 2002, 35 SNe were found using our test-bed pipeline for automated SN search and discovery. The pipeline uses images from the asteroid search conducted by the Near Earth Asteroid Tracking group at JPL. Improvements in our subtraction techniques and analysis have allowed us to increase our effective SN discovery rate to {approx}12 SNe/month in 2003.

Wood-Vasey, W.M.; Aldering, G.; Lee, B.C.; Loken, S.; Nugent, P.; Perlmutter, S.; Siegrist, J.; Wang, L.; Antilogus, P.; Astier, P.; Hardin, D.; Pain, R.; Copin, Y.; Smadja, G.; Gangler, E.; Castera, A.; Adam, G.; Bacon, R.; Lemonnier, J.-P.; Pecontal, A.; Pecontal, E.; Kessler, R.

2004-01-23T23:59:59.000Z

6

Assessment of Tall Wind Tower Technology  

Science Conference Proceedings (OSTI)

Technologies that enable wind turbines to capture more energy at a given site have the potential to reduce the overall cost of energy, thereby making wind power more competitive against conventional power generation. Because wind speed generally increases with height above ground, one way to increase energy capture is to elevate the rotor by means of a taller tower. To exploit this potential, a number of tall tower models are under development or have recently been introduced to the wind energy market. I...

2011-11-08T23:59:59.000Z

7

DRIFT ISSUES OF TALL BUILDINGS DURING THE MARCH ...  

Science Conference Proceedings (OSTI)

... Tower in NYC, 92 story Trump Tower (Chicago), 828 m tall Bhuj Tower in Dubai).Their performances are yet to be assessed and/or observed! ...

2013-02-19T23:59:59.000Z

8

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)

9

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

10

Microsoft Word - Tall_Pines_CX.doc  

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

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

Regulation of Tall Structures (Indiana) | Department of Energy  

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

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

12

Wind Shear Characteristics at Central Plains Tall Towers: Preprint  

SciTech Connect

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

Schwartz, M.; Elliott, D.

2006-06-01T23:59:59.000Z

13

EP for Efficient Stochastic Control with Obstacles  

Science Conference Proceedings (OSTI)

We address the problem of continuous stochastic optimal control in the presence of hard obstacles. Due to the non-smooth character of the obstacles, the traditional approach using dynamic programming in combination with function approximation tends to ...

Thomas Mensink; Jakob Verbeek; Bert Kappen

2010-08-01T23:59:59.000Z

14

Natural gas: Removing the obstacles  

Science Conference Proceedings (OSTI)

Defining and then figuring out how to remove whatever obstacles may be blocking the wider use of natural gas was the purpose of a conference held early last month in Phoenix, Arizona. The unique, three-day event was jointly sponsored by the U.S. Department of Energy (DOE) and the National Association of Regulatory Utility Commissioners (NARUC). It drew an overflow crowd of more than 500, with a registration list that read like a Who's Who of the natural gas industry. This article summarizes some of the main points of this conference.

Romo, C.

1992-03-15T23:59:59.000Z

15

Modeling, loading, and preliminary design considerations for tall guyed towers  

Science Conference Proceedings (OSTI)

In this paper, the authors first summarize the results of an investigation they carried out on the collapse of a 1900 ft tall guyed tower under ice and wind loads. Based on this investigation, they then proceed to present some structural analysis recommendations relating to loading and modeling concerns. Special emphasis is placed on the importance of ice loading, and on the level of accuracy required in modeling the nonlinear response behavior. Finally, the conclusions drawn from this study are used to formulate preliminary design guidelines. This facilitates a systematic approach for the design of tall guyed towers. 23 refs.

Gantes, C.; Khoury, R.; Connors, J.J.; Pouangare, C. [Engg Information Technology, Cambridge, MA (United States)

1993-12-01T23:59:59.000Z

16

Tall structure lightning induced by sprite-producing discharges.  

SciTech Connect

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

17

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

18

Wind Shear Characteristics at Central Plains Tall Towers (presentation)  

SciTech Connect

The objectives of this report are: (1) Analyze wind shear characteristics at tall tower sites for diverse areas in the central plains (Texas to North Dakota)--Turbines hub heights are now 70-100 m above ground and Wind measurements at 70-100+ m have been rare. (2) Present conclusions about wind shear characteristics for prime wind energy development regions.

Schwartz, M.; Elliott, D.

2006-06-05T23:59:59.000Z

19

Wind Shear Characteristics at Central Plains Tall Towers  

Science Conference Proceedings (OSTI)

The object of this study is to analyze wind shear characteristics at tall tower sites in the Central Plains of the United States. The hub heights of modern turbines used for wind farm projects are now 70 meters (m) to 100 m above ground and some advanced turbines under development for deployment during the second half of this decade are rated at 2-5 megawatts of energy generation with rotor diameters near 100 m and hub heights of 100-120 m. These advanced turbines will take advantage of the higher wind speeds aloft to generate more wind energy. Specific knowledge of important wind shear characteristics near and at turbine hub height is needed to optimize turbine design and wind farm layout. Unfortunately, wind speed shear measurements at heights of 80-120 m were virtually nonexistent a few years ago and are still quite uncommon today. The Central Plains is a prime wind energy development region and knowledge about the wind shear characteristics will reduce uncertainty about the resource and enhance wind farm design. Previous analyses of tall tower data (Schwartz and Elliott, 2005) concentrated on data from specific states. The wind energy community has recognized the need to fill the gap of direct wind speed measurements at levels 70 m and higher above the ground. Programs instituted during the last 5 years at the state level and supported by the U.S. Department of Energy's (DOE) State Energy Program initiative have placed anemometers and vanes at several levels on existing tall (70 m+) communication towers. The Central Plains has a fairly high concentration of tall tower sites. The distribution of tall tower sites varies among the states in the Central Plains, because the tall tower program is new and the available state and federal funding to establish tall towers is variable. Our wind resource assessment group at DOE's National Renewable Energy Laboratory (NREL) has obtained much of these necessary measurement data from both individual state sources and regional organizations. Most of the data are available to the public, though data from one tower in Colorado are proprietary. We have begun to analyze important wind climate parameters, including wind shear from the tall towers. A total of 13 tall towers were used for this study. Eleven of the towers had the highest anemometer level between 100 m and 113 m. Two towers had the highest measurement level between 70 m and 85 m above ground. The distribution of the towers among the states is: two sites in Texas and Oklahoma; six sites in Kansas; and one site each in Colorado, South Dakota, and North Dakota. Figure 1 shows the locations and names of the thirteen towers. The wind resource at these sites can be classified as ranging from good-to-excellent. Eight tall tower sites have Class 3 resource, four sites have Class 4 resource, and one has Class 5 resource at 50 m.

Schwartz, M.; Elliott, D.

2006-01-01T23:59:59.000Z

20

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.

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

Process for tertiary oil recovery using tall oil pitch  

DOE Patents (OSTI)

Compositions and process employing same for enhancing the recovery of residual acid crudes, particularly heavy crudes, by injecting a composition comprising caustic in an amount sufficient to maintain a pH of at least about 11, preferably at least about 13, and a small but effective amount of a multivalent cation for inhibiting alkaline silica dissolution with the reservoir. Preferably a tall oil pitch soap is included and particularly for the heavy crudes a polymeric mobility control agent.

Radke, Clayton J. (El Cerrito, CA)

1985-01-01T23:59:59.000Z

22

Russian Tall Ship to Search for Missing Tsunami Debris  

E-Print Network (OSTI)

Hafner’s meeting with Captain Sviridenko of the Russian Tall Ship STS Pallada to be on the look-?out for any debris from Japan's tsunami, Hafner was interviewed by KITV4 about any knowldedge of the whereabouts of the debris. To help in efforts to track the debris, the scientists need to validate their models ' projections of the debris field and are asking ships in the North Pacific to report to them on what they see, and if possible take samples. Click here to listen to interview. Websites to see projected tsunami debris paths For the original animation from the statistical model, please visit:

Nikolai Maximenko; Jan Hafner

2011-01-01T23:59:59.000Z

23

Electromagnetic field radiation model for lightning strokes to tall structures  

SciTech Connect

This paper describes observation and analysis of electromagnetic field radiation from lightning strokes to tall structures. Electromagnetic field waveforms and current waveforms of lightning strokes to the CN Tower have been simultaneously measured since 1991. A new calculation model of electromagnetic field radiation is proposed. The proposed model consists of the lightning current propagation and distribution model and the electromagnetic field radiation model. Electromagnetic fields calculated by the proposed model, based on the observed lightning current at the CN Tower, agree well with the observed fields at 2km north of the tower.

Motoyama, H. [CRIEPI, Tokyo (Japan); Janischewskyj, W.; Hussein, A.M. [Univ. of Toronto, Ontario (Canada); Chisholm, W.A. [Ontario Hydro Technologies, Toronto, Ontario (Canada); Chang, J.S. [McMaster Univ., Hamilton, Ontario (Canada); Rusan, R.

1996-07-01T23:59:59.000Z

24

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

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

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...

25

Dynamic characteristics and wind-induced responses of a super tall building.  

E-Print Network (OSTI)

??This thesis describes a combined experimental and numerical investigation of wind effects on a super tall building, Di Wang Tower (325m high with 79 floors)… (more)

Liu, Pengfei (???)

2007-01-01T23:59:59.000Z

26

A field study of API learning obstacles  

Science Conference Proceedings (OSTI)

Large APIs can be hard to learn, and this can lead to decreased programmer productivity. But what makes APIs hard to learn? We conducted a mixed approach, multi-phased study of the obstacles faced by Microsoft developers learning a wide variety of new ... Keywords: Application programming interfaces, Documentation, Programming, Software libraries

Martin P. Robillard; Robert Deline

2011-12-01T23:59:59.000Z

27

Atmospheric Stability Impacts on Power Curves of Tall Wind Turbines - An Analysis of a West Coast North American Wind Farm  

SciTech Connect

Tall wind turbines, with hub heights at 80 m or above, can extract large amounts of energy from the atmosphere because they are likely to encounter higher wind speeds, but they face challenges given the complex nature of wind flow and turbulence at these heights in the boundary layer. Depending on whether the boundary layer is stable, neutral, or convective, the mean wind speed, direction, and turbulence properties may vary greatly across the tall turbine swept area (40 to 120 m AGL). This variability can cause tall turbines to produce difference amounts of power during time periods with identical hub height wind speeds. Using meteorological and power generation data from a West Coast North American wind farm over a one-year period, our study synthesizes standard wind park observations, such as wind speed from turbine nacelles and sparse meteorological tower observations, with high-resolution profiles of wind speed and turbulence from a remote sensing platform, to quantify the impact of atmospheric stability on power output. We first compare approaches to defining atmospheric stability. The standard, limited, wind farm operations enable the calculation only of a wind shear exponent ({alpha}) or turbulence intensity (I{sub U}) from cup anemometers, while the presence at this wind farm of a SODAR enables the direct observation of turbulent kinetic energy (TKE) throughout the turbine rotor disk. Additionally, a nearby research meteorological station provided observations of the Obukhov length, L, a direct measure of atmospheric stability. In general, the stability parameters {alpha}, I{sub U}, and TKE are in high agreement with the more physically-robust L, with TKE exhibiting the best agreement with L. Using these metrics, data periods are segregated by stability class to investigate power performance dependencies. Power output at this wind farm is highly correlated with atmospheric stability during the spring and summer months, while atmospheric stability exerts little impact on power output during the winter and autumn periods. During the spring and summer seasons, power output for a given wind speed was significantly higher during stable conditions and significantly lower during strongly convective conditions: power output differences approached 20% between stable and convective regimes. The dependency of stability on power output was apparent only when both turbulence and the shape of the wind speed profile were considered. Turbulence is one of the mechanisms by which atmospheric stability affects a turbine's power curve at this particular site, and measurements of turbulence can yield actionable insights into wind turbine behavior.

Wharton, S; Lundquist, J K

2010-02-22T23:59:59.000Z

28

Atmospheric Stability Impacts on Power Curves of Tall Wind Turbines - An Analysis of a West Coast North American Wind Farm  

SciTech Connect

Tall wind turbines, with hub heights at 80 m or above, can extract large amounts of energy from the atmosphere because they are likely to encounter higher wind speeds, but they face challenges given the complex nature of wind flow and turbulence at these heights in the boundary layer. Depending on whether the boundary layer is stable, neutral, or convective, the mean wind speed, direction, and turbulence properties may vary greatly across the tall turbine swept area (40 to 120 m AGL). This variability can cause tall turbines to produce difference amounts of power during time periods with identical hub height wind speeds. Using meteorological and power generation data from a West Coast North American wind farm over a one-year period, our study synthesizes standard wind park observations, such as wind speed from turbine nacelles and sparse meteorological tower observations, with high-resolution profiles of wind speed and turbulence from a remote sensing platform, to quantify the impact of atmospheric stability on power output. We first compare approaches to defining atmospheric stability. The standard, limited, wind farm operations enable the calculation only of a wind shear exponent ({alpha}) or turbulence intensity (I{sub U}) from cup anemometers, while the presence at this wind farm of a SODAR enables the direct observation of turbulent kinetic energy (TKE) throughout the turbine rotor disk. Additionally, a nearby research meteorological station provided observations of the Obukhov length, L, a direct measure of atmospheric stability. In general, the stability parameters {alpha}, I{sub U}, and TKE are in high agreement with the more physically-robust L, with TKE exhibiting the best agreement with L. Using these metrics, data periods are segregated by stability class to investigate power performance dependencies. Power output at this wind farm is highly correlated with atmospheric stability during the spring and summer months, while atmospheric stability exerts little impact on power output during the winter and autumn periods. During the spring and summer seasons, power output for a given wind speed was significantly higher during stable conditions and significantly lower during strongly convective conditions: power output differences approached 20% between stable and convective regimes. The dependency of stability on power output was apparent only when both turbulence and the shape of the wind speed profile were considered. Turbulence is one of the mechanisms by which atmospheric stability affects a turbine's power curve at this particular site, and measurements of turbulence can yield actionable insights into wind turbine behavior.

Wharton, S; Lundquist, J K

2010-02-22T23:59:59.000Z

29

The evaluation of retrofit measures in a tall residential building  

SciTech Connect

As part of a joint demonstration effort involving the US Department of Energy (DOE), the US Department of Housing and Urban Development (HUD), Boston Edison Company (BECo), and the Chelsea Housing Authority, Oak Ridge National Laboratory (ORNL) participated in the evaluation of energy and demand saving retrofits for a tall residential building located in Boston. The thirteen story all-electric building underwent window, lighting, and control renovations in December, 1992. annual energy consumption was reduced by 15% and peak demand fell by 17%. Hourly should building consumption data were available for the comparison of pre- and post- conditions and for calibration of a DOE-2.1D simulation model. The analysis found the window retrofit accounted for 90% of total energy savings and 95% of average demand savings, due to reductions in both conduction and infiltration. Benefits from lighting retrofits were low in cooling months and negligible in winter months due to the increase in the demand for electric resistance heating which was proportional to the reduction in lighting capacity. Finally, the simulation model verified that heating system controls had not been used as intended, and that the utility rate structure would not allow cost savings from the original control strategy. These results and other interesting lessons learned are presented.

Abraham, M.M.; McLain, H.A.

1995-07-01T23:59:59.000Z

30

FLUX MEASUREMENTS FROM A TALL TOWER IN A COMPLEX LANDSCAPE  

Science Conference Proceedings (OSTI)

The accuracy and representativeness of flux measurements from a tall tower in a complex landscape was assessed by examining the vertical and sector variability of the ratio of wind speed to momentum flux and the ratio of vertical advective to eddy flux of heat. The 30-60 m ratios were consistent with theoretical predictions which indicate well mixed flux footprints. Some variation with sector was observed that were consistent with upstream roughness. Vertical advection was negligible compared with vertical flux except for a few sectors at night. This implies minor influence from internal boundary layers. Flux accuracy is a function of sector and stability but 30-60 m fluxes were found to be generally representative of the surrounding landscape. This paper will study flux data from a 300 m tower, with 4 levels of instruments, in a complex landscape. The surrounding landscape will be characterized in terms of the variation in the ratio of mean wind speed to momentum flux as a function of height and wind direction. The importance of local advection will be assessed by comparing vertical advection with eddy fluxes for momentum and heat.

Kurzeja, R.; Weber, A.; Chiswell, S.; Parker, M.

2010-07-22T23:59:59.000Z

31

Radiatively Inefficient Accretion in Nearby Galaxies  

E-Print Network (OSTI)

We use new central stellar velocity dispersions and nuclear X-ray and Halpha luminosities for the Palomar survey of nearby galaxies to investigate the distribution of nuclear bolometric luminosities and Eddington ratios for their central black holes (BHs). This information helps to constrain the nature of their accretion flows and the physical drivers that control the spectral diversity of nearby active galactic nuclei. The characteristic values of the bolometric luminosities and Eddington ratios, which span over 7-8 orders of magnitude, from L_bol transition objects --> LINERs --> Seyferts. The Eddington ratio also increases from early-type to late-type galaxies. We show that the very modest accretion rates inferred from the nuclear luminosities can be readily supplied through local mass loss from evolved stars and Bondi accretion of hot gas, without appealing to additional fueling mechanisms such as angular momentum transport on larger scales. Indeed, we argue that the fuel reservoir generated by local pro...

Ho, Luis C

2009-01-01T23:59:59.000Z

32

Tall buildings in Asia : a critique on the high-rise building in Colombo, Shri Lanka  

E-Print Network (OSTI)

The recent generation of tall buildings in Asia have been appropriated from the West with little adaptation. With no understanding of the forces that have generated this building form, Asia embraces the high-rise as an ...

Pieris, Anoma D. (Anoma Darshani)

1993-01-01T23:59:59.000Z

33

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

E-Print Network (OSTI)

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

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

2011-01-01T23:59:59.000Z

34

A technique to measure turbulent free convective heat transfer in a vertical tall cavity.  

E-Print Network (OSTI)

??A time-average technique was developed to measure the unsteady and turbulent free convection heat transfer in tall vertical enclosure using a Mach-Zehnder interferometer. The method… (more)

Poulad, Mohammad Ebrahim

2009-01-01T23:59:59.000Z

35

Evaluation of Turbulent Surface Flux Parameterizations over Tall Grass in a Beijing Suburb  

Science Conference Proceedings (OSTI)

Numerical weather and climate prediction systems necessitate accurate land surface–atmosphere fluxes, whose determination typically replies on a suite of parameterization schemes. The authors present a field investigation over tall grass in a ...

Linlin Wang; Zhiqiu Gao; Zaitao Pan; Xiaofeng Guo; Elie Bou-Zeid

2013-10-01T23:59:59.000Z

36

Numerical Simulation of Flow around a Tall Isolated Seamount. Part II: Resonant Generation of Trapped Waves  

Science Conference Proceedings (OSTI)

A sigma-coordinate, primitive equation ocean circulation model is used to explore the problem of the remnant generation of trapped waves about a tall, circular, isolated seamount by an incident oscillatory barotropic current. The numerical ...

Dale B. Haidvogel; Aike Beckmann; David C. Chapman; Ray-Qing Lin

1993-11-01T23:59:59.000Z

37

An Atmospheric Solitary Gust Observed with a Doppler Radar, a Tall Tower and a Surface Network  

Science Conference Proceedings (OSTI)

Doppler radar and a 444 m tall instrumented tower provide a detailed view of the kinematic and thermodynamic structure of a solitary gust. A study of the data fields, and comparison with theoretical and laboratory work leads to the conclusion ...

Richard J. Doviak; Runsheng Ge

1984-09-01T23:59:59.000Z

38

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

39

Vortex flow around the bases of obstacles  

E-Print Network (OSTI)

.2 The horseshoe . vortex formed by a separating turbulent boundary layer 5.3 Scour around obstacles in an erodible bed 114 116 117 . ·4 References Uf'l() I:!~oLtlecl F,'obL.efl):' Llr:cl ~u.g5el:dto/J~ fer ju.iLt(t' wc"..,I" 11 2 119 Figures (vi... , are shmm in figUre 2.3.4. It can be seen that there is a rather high le,el of turbulence in the tunnel free stream. This is poss:l.bly due to the extra screens placed upstream of the \\'lorking section. At the higher speeds used this turbulence...

Baker, Christopher James

1979-02-06T23:59:59.000Z

40

Near-optimal data propagation by efficiently advertising obstacle boundaries  

Science Conference Proceedings (OSTI)

We propose local mechanisms for efficiently marking the broader network region around obstacles, for data propagation to early enough avoid them towards near-optimal routing paths. In particular, our methods perform an on-line identification of sensors ... Keywords: obstacle avoidance, performance evaluation, routing, sensor networks

Andreas Koutsopoulos; Sotiris Nikoletseas; José D.P. Rolim

2009-10-01T23:59:59.000Z

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.


41

A heuristic method for obstacle avoiding group Steiner tree construction  

Science Conference Proceedings (OSTI)

Very large scale integration (VLSI) global routing is typically performed on a rectangular die space amidst multiple IP cores and gates, typically treated as obstacles during net routing. In this paper, we address the global routing problem ... Keywords: VLSI routing, algorithm, group Steiner tree, obstacle avoiding rectilinear steiner tree

Tuhina Samanta; Raka Sardar; Hafizur Rahaman; Parthasarathi Dasgupta; Bhargab B. Bhattacharya

2012-06-01T23:59:59.000Z

42

Berkeley Lab: Nearby Short-Term Accommodations  

NLE Websites -- All DOE Office Websites (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

43

Wind Profiler and RASS Measurements Compared with Measurements from a 450-m-Tall Tower  

Science Conference Proceedings (OSTI)

A 915-MHz boundary layer wind profiler with radio acoustic sounding system (RASS) was sited 8 km from a very tall (450 m) television transmitting tower in north-central Wisconsin during the spring, summer, and autumn of 1995. The profiler ...

Wayne M. Angevine; Peter S. Bakwin; Kenneth J. Davis

1998-06-01T23:59:59.000Z

44

Real-time Eulerian water simulation using a restricted tall cell grid  

Science Conference Proceedings (OSTI)

We present a new Eulerian fluid simulation method, which allows real-time simulations of large scale three dimensional liquids. Such scenarios have hitherto been restricted to the domain of off-line computation. To reduce computation time we use a hybrid ... Keywords: fluid simulation, multigrid, real time, tall cell grid

Nuttapong Chentanez; Matthias Müller

2011-08-01T23:59:59.000Z

45

Numerical Simulation of Flow around a Tall Isolated Seamount. Part I: Problem Formulation and Model Accuracy  

Science Conference Proceedings (OSTI)

A sigma coordinate ocean circulation model is employed to study flow trapped to a tall seamount in a periodic f-plane channel. In Part I, errors arising from the pressure gradient formulation in the steep topography/strong stratification limit ...

Aike Beckmann; Dale B. Haidvogel

1993-08-01T23:59:59.000Z

46

The GALEX Ultraviolet Atlas of Nearby Galaxies  

E-Print Network (OSTI)

We present images, integrated photometry, surface-brightness and color profiles for a total of 1034 nearby galaxies recently observed by the GALEX satellite in its far-ultraviolet (FUV; 1516A) and near-ultraviolet (NUV; 2267A) bands. (...) This data set has been complemented with archival optical, near-infrared, and far-infrared fluxes and colors. We find that the integrated (FUV-K) color provides robust discrimination between elliptical and spiral/irregular galaxies and also among spiral galaxies of different sub-types. Elliptical galaxies with brighter K-band luminosities (i.e. more massive) are redder in (NUV-K) color but bluer in (FUV-NUV) than less massive ellipticals. In the case of the spiral/irregular galaxies our analysis shows the presence of a relatively tight correlation between the (FUV-NUV) color and the total infrared-to-UV ratio. The correlation found between (FUV-NUV) color and K-band luminosity (with lower luminosity objects being bluer than more luminous ones) can be explained as due to an increase in the dust content with galaxy luminosity. The images in this Atlas along with the profiles and integrated properties are publicly available through a dedicated web page at http://nedwww.ipac.caltech.edu/level5/GALEX_Atlas/

A. Gil de Paz; S. Boissier; B. F. Madore; M. Seibert; Y. H. Joe; A. Boselli; T. K. Wyder; D. Thilker; L. Bianchi; S. -C. Rey; R. M. Rich; T. A. Barlow; T. Conrow; K. Forster; P. G. Friedman; D. C. Martin; P. Morrissey; S. G. Neff; D. Schiminovich; T. Small; J. Donas; T. M. Heckman; Y. -W. Lee; B. Milliard; A. S. Szalay; S. Yi

2006-06-19T23:59:59.000Z

47

Lee-Wave Resonances over Double Bell-Shaped Obstacles  

Science Conference Proceedings (OSTI)

Lee-wave resonance over double bell-shaped obstacles is investigated through a series of idealized high-resolution numerical simulations with the nonhydrostatic Coupled Ocean–Atmosphere Mesoscale Prediction System (COAMPS) model using a free-slip ...

Vanda Grubiši?; Ivana Stiperski

2009-05-01T23:59:59.000Z

48

Managing stormwater in Watertown, MA : overcoming obstacles to change  

E-Print Network (OSTI)

As effective imperviousness increases with urbanization, the impacts of stormwater runoff on local water systems and aquatic life are more and more deleterious. Stormwater runoff carries pollutants into nearby water bodies, ...

Chai, Shutsu K. (Shutsu Kindness)

2009-01-01T23:59:59.000Z

49

Turbulent Transfer Coefficients and Calculation of Air Temperature inside Tall Grass Canopies in Land–Atmosphere Schemes for Environmental Modeling  

Science Conference Proceedings (OSTI)

A method for estimating profiles of turbulent transfer coefficients inside a vegetation canopy and their use in calculating the air temperature inside tall grass canopies in land surface schemes for environmental modeling is presented. The ...

D. T. Mihailovic; K. Alapaty; B. Lalic; I. Arsenic; B. Rajkovic; S. Malinovic

2004-10-01T23:59:59.000Z

50

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

E-Print Network (OSTI)

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

Nelson, David J. (David Jeffrey)

1987-01-01T23:59:59.000Z

51

Meteorological Patterns Associated with Maximum 3-Hour Average Concentrations Predicted by the CRSTER Model for a Tall Stack Source  

Science Conference Proceedings (OSTI)

Regional meteorological patterns associated with maximum 3-hour average concentrations predicted by the U.S. EPA CRSTER model for emissions from a tall stack were examined for a limited sample. Causes of predicted peaks were the movements of weak ...

Paul N. Derezotes

1984-11-01T23:59:59.000Z

52

Discovery and Study of Nearby Habitable Planets with Mesolensing  

E-Print Network (OSTI)

We demonstrate that gravitational lensing can be used to discover and study planets in the habitable zones of nearby dwarf stars. If appropriate software is developed, a new generation of monitoring programs will automatically conduct a census of nearby planets in the habitable zones of dwarf stars. In addition, individual nearby dwarf stars can produce lensing events at predictable times; careful monitoring of these events can discover any planets located in the zone of habitability. Because lensing can discover planets (1) in face-on orbits, and (2) in orbit around the dimmest stars, lensing techniques will provide complementary information to that gleaned through Doppler and/or transit investigations. The ultimate result will be a comprehensive understanding of the variety of systems with conditions similar to those that gave rise to life on Earth.

Di Stefano, Rosanne

2008-01-01T23:59:59.000Z

53

Discovery and Study of Nearby Habitable Planets with Mesolensing  

E-Print Network (OSTI)

We demonstrate that gravitational lensing can be used to discover and study planets in the habitable zones of nearby dwarf stars. If appropriate software is developed, a new generation of monitoring programs will automatically conduct a census of nearby planets in the habitable zones of dwarf stars. In addition, individual nearby dwarf stars can produce lensing events at predictable times; careful monitoring of these events can discover any planets located in the zone of habitability. Because lensing can discover planets (1) in face-on orbits, and (2) in orbit around the dimmest stars, lensing techniques will provide complementary information to that gleaned through Doppler and/or transit investigations. The ultimate result will be a comprehensive understanding of the variety of systems with conditions similar to those that gave rise to life on Earth.

Rosanne Di Stefano; Christopher Night

2008-01-09T23:59:59.000Z

54

A POSTERIORI ESTIMATES FOR THE CAHN--HILLIARD EQUATION WITH OBSTACLE FREE ENERGY  

E-Print Network (OSTI)

A POSTERIORI ESTIMATES FOR THE CAHN--HILLIARD EQUATION WITH OBSTACLE FREE ENERGY L'UBOMĂŤR BA#AS 1 of the standard Cahn--Hilliard equation with a double obstacle free energy. The derived estimates are robust and e algorithm. Keywords: Cahn--Hilliard equation, obstacle free energy, linear finite elements, a posteriori

Banas, Lubomir

55

A viral system algorithm to optimize the car dispatching in elevator group control systems of tall buildings  

Science Conference Proceedings (OSTI)

Nowadays is very common the presence of tall buildings in the business centres of the main cities of the world. Such buildings require the installation of numerous lifts that are coordinated and managed under a unique control system. Population working ... Keywords: Bio-inspired algorithms, Elevator, Elevator group control system, Lift, Vertical transportation, Viral system

Pablo CortéS; Luis Onieva; JesúS MuńUzuri; José Guadix

2013-01-01T23:59:59.000Z

56

Obstacle detectors for automated transit vehicles: a technoeconomic and market analysis  

SciTech Connect

A search was conducted to identify the technical and economic characteristics of both NASA and nonNASA obstacle detectors. The findings, along with market information were compiled and analyzed for consideration by DOT and NASA in decisions about any future automated transit vehicle obstacle detector research, development, or applications project. Currently available obstacle detectors and systems under development are identified by type (sonic, capacitance, infrared/optical, guided radar, and probe contact) and compared with the three NASA devices selected as possible improvements or solutions to the problems in existing obstacle detection systems. Cost analyses and market forecasts individually for the AGT and AMTV markets are included.

Lockerby, C.E.

1979-12-01T23:59:59.000Z

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

A UNIVERSAL NEUTRAL GAS PROFILE FOR NEARBY DISK GALAXIES  

SciTech Connect

Based on sensitive CO measurements from HERACLES and H I data from THINGS, we show that the azimuthally averaged radial distribution of the neutral gas surface density ({Sigma}{sub HI}+ {Sigma}{sub H2}) in 33 nearby spiral galaxies exhibits a well-constrained universal exponential distribution beyond 0.2 Multiplication-Sign r{sub 25} (inside of which the scatter is large) with less than a factor of two scatter out to two optical radii r{sub 25}. Scaling the radius to r{sub 25} and the total gas surface density to the surface density at the transition radius, i.e., where {Sigma}{sub HI} and {Sigma}{sub H2} are equal, as well as removing galaxies that are interacting with their environment, yields a tightly constrained exponential fit with average scale length 0.61 {+-} 0.06 r{sub 25}. In this case, the scatter reduces to less than 40% across the optical disks (and remains below a factor of two at larger radii). We show that the tight exponential distribution of neutral gas implies that the total neutral gas mass of nearby disk galaxies depends primarily on the size of the stellar disk (influenced to some degree by the great variability of {Sigma}{sub H2} inside 0.2 Multiplication-Sign r{sub 25}). The derived prescription predicts the total gas mass in our sub-sample of 17 non-interacting disk galaxies to within a factor of two. Given the short timescale over which star formation depletes the H{sub 2} content of these galaxies and the large range of r{sub 25} in our sample, there appears to be some mechanism leading to these largely self-similar radial gas distributions in nearby disk galaxies.

Bigiel, F. [Institut fuer theoretische Astrophysik, Zentrum fuer Astronomie der Universitaet Heidelberg, Albert-Ueberle Str. 2, D-69120 Heidelberg (Germany); Blitz, L., E-mail: bigiel@uni-heidelberg.de [Department of Astronomy, Radio Astronomy Laboratory, University of California at Berkeley, CA 94720 (United States)

2012-09-10T23:59:59.000Z

59

Experimental study of flame propagation in semiconfined geometries with obstacles  

DOE Green Energy (OSTI)

Accidents in which large quantities of liquefied natural gas (LNG) or other combustible materials are spilled can potentially lead to disastrous consequences, especially if the dispersing combustible cloud finds a suitable ignition source. So far, very little is known about the detailed behavior of a large burning cloud. Full-scale experiments are economically prohibitive, and therefore one must rely on laboratory and field experiments of smaller size, scaling up the results to make predictions about larger spill accidents. In this paper we describe our laboratory-scale experiments with a combustible propane/air mixture in various partially confined geometries. We summarize the experimental results and compare them with calculated results based on numerical simulations of the experiments. Our observations suggest that the geometry of the partial confinement is of primary importance; turbulence-producing obstacles can cause acceleration in the flame front and, more important, can cause a faster burnout of the combustible vapor.

Urtiew, P.A.; Brandeis, J.; Hogan, W.J.

1982-02-08T23:59:59.000Z

60

Low-Level Nuclear Activity in Nearby Spiral Galaxies  

E-Print Network (OSTI)

We are conducting a search for supermassive black holes (SMBHs) with masses below 10^7 M_sun by looking for signs of extremely low-level nuclear activity in nearby galaxies that are not known to be AGNs. Our survey has the following characteristics: (a) X-ray selection using the Chandra X-ray Observatory, since x-rays are a ubiquitous feature of AGNs; (b) Emphasis on late-type spiral and dwarf galaxies, as the galaxies most likely to have low-mass SMBHs; (c) Use of multiwavelength data to verify the source is an AGN; and (d) Use of the highest angular resolution available for observations in x-rays and other bands, to separate nuclear from off-nuclear sources and to minimize contamination by host galaxy light. Here we show the feasibility of this technique to find AGNs by applying it to six nearby, face-on spiral galaxies (NGC 3169, NGC 3184, NGC 4102, NGC 4647, NGC 4713, NGC 5457) for which data already exist in the Chandra archive. All six show nuclear x-ray sources. The data as they exist at present are ambiguous regarding the nature of the nuclear x-ray sources in NGC 4713 and NGC 4647. We conclude, in accord with previous studies, that NGC 3169 and NGC 4102 are almost certainly AGNs. Most interestingly, a strong argument can be made that NGC 3184 and NGC 5457, both of type Scd, host AGNs.

Himel Ghosh; Smita Mathur; Fabrizio Fiore; Laura Ferrarese

2008-01-28T23:59:59.000Z

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


61

From Nearby to High Redshift Compact Group of Galaxies  

E-Print Network (OSTI)

Nearby Compact Groups of Galaxies (CGs) are very complex systems, tracing their history is a challenge (e.g. Stephan's Quintet). The presence of a diffuse X-rays emission that often peaks in the center of CGs shows that CGs are bound structures, they show numerous signs of interaction but their lifetime in much longer than their crossing times. Hickson CGs clearly show different stages of evolution, from weakly interacting galaxies to merging systems. CGs infalling into clusters may provide a mechanism to form clusters at high redshifts (e.g. in A1367). Massive versions of today's CGs may have been the best candidate precursors of fossil groups. Do CGs mimic the high redshift universe? This is still an open question. Indeed, their high density and low velocity dispersion should induce a high interaction rate and fast merging, CGs are nevertheless long-lived structures. On the other hand, there is probably no (or a few) isolated CGs in the high z universe. CGs may fuel high z clusters, they may produce fossil groups and fossil ellipticals. CGs at high z are difficult to detect and are still to be discovered. Interpretation of distant kinematics of galaxies may need nearby sample of galaxies to disentangle beam-smearing from evolutionary effects (e.g. HCG 31). Beam smearing effects may bias the Tully-Fisher relation (shifted towards lower M/L).

Philippe Amram; Chantal Balkowski; Claudia Mendes de Oliveira; Henri Plana; Benoit Epinat

2006-10-30T23:59:59.000Z

62

Geological isotope anomalies as signatures of nearby supernovae  

E-Print Network (OSTI)

Nearby supernova explosions may cause geological isotope anomalies via the direct deposition of debris or by cosmic-ray spallation in the earth's atmosphere. We estimate the mass of material deposited terrestrially by these two mechanisms, showing the dependence on the supernova distance. A number of radioactive isotopes are identified as possible diagnostic tools, such as Be-10, Al-26, Cl-36, Mn-53, Fe-60, and Ni-59, as well as the longer-lived I-129, Sm-146, and Pu-244. We discuss whether the 35 and 60 kyr-old Be-10 anomalies observed in the Vostok antarctic ice cores could be due to supernova explosions. Combining our estimates for matter deposition with results of recent nucleosynthesis yields, we calculate the expected signal from nearby supernovae using ice cores back to \\sim 300 kyr ago, and we discuss using deep ocean sediments back to several hundred Myr. In particular, we examine the prospects for identifying isotope anomalies due to the Geminga supernova explosion, and signatures of the possibility...

Ellis, Jonathan Richard; Schramm, David N; Ellis, John; Fields, Brian D; Schramm, David N

1996-01-01T23:59:59.000Z

63

Laser-induced Breakdown Spectroscopy used to Detect Endophyte-mediated Accumulation of Metals by Tall Fescue  

Science Conference Proceedings (OSTI)

Laser-induced breakdown spectroscopy was used to determine the impact of endophyte (Neotyphodium sp.) infection on elemental composition of tall fescue (Festuca arundinacea). Leaf material from endophyte-infected (E+) and endophyte-free (E-) tall fescue populations in established plots was examined. Leaf-tissue digestates were also tested for metals, by ICP-MS. Seven of eleven metals (Ca, Mg, Fe, Mn, Cu, Ni and Zn) were measured by both techniques at concentrations great enough to reliably compare. Mg, Zn, and Cd, a toxic metal that can be present in forage, were readily detected by LIBS, even though Cd concentrations in the plants were below levels typically achieved using ICP-MS detection. Implications of these results for research on forage analysis and phytoremediation are discussed.

Martin, Madhavi Z [ORNL; Stewart, Arthur J [ORNL; Gwinn, Dr. Kimberley [University of Tennessee, Knoxville (UTK); Waller, John C [ORNL

2010-01-01T23:59:59.000Z

64

Wind response of a tall building with full-scale observations  

SciTech Connect

A 22-story hotel is the subject of a full-scale experimental study conducted as the second phase of a project addressing the wind-induced response of tall buildings. The first phase of this study investigated a 16-story office building. The observations of wind loading and building response obtained at the hotel site reflect similar behavior as was observed at the office building. Consequently, the second phase serves to reinforce and generalize the findings of the phase one study. The results illustrate the significance of wind-induced response for buildings of intermediate height. Based on estimated thresholds of human perceptibility combined with predictions of maximum building response from a theoretical analysis, clearly perceptible wind-induced motion is expected to occur annually at the hotel. Yet, motion will not be sufficient intensity to be unpleasant. A similar analysis suggests that building response will also produce some non-structural damage on an annual basis. 3 refs., 5 figs., 2 tabs.

Mills, R.S. (California State Univ., Chico, CA (United States))

1991-08-01T23:59:59.000Z

65

A virtual tall tower network for understanding continental sources and sinks of CO2  

SciTech Connect

Our understanding of the North American terrestrial carbon cycle is limited by both a lack of continental atmospheric CO2 data, and by a need for methods to interpret these and other continental data with confidence. In response to this challenge a rapid expansion of the N. American carbon cycle observational network is underway. This expansion includes a network of continuous, continental CO2 mixing ratio observations being collected at a subset of AmeriFlux towers. Progress in developing this resource includes instrument development, site installation, calibration and intercalibration efforts, and initiation of a uniform data product. Progess in applying these data include proposed methods for interpreting surface layer measurements in atmospheric inversions (the virtual tall towers approach), examination of coherence patterns in continental mixing ratios in response to weather and climate, and application of these mixing ratio measurements in formal atmospheric inversions. Future work will merge these methods with interpretation of flux towers observations of terrestrial carbon fluxes in an effort to create a single coherent diagnosis of North American terrestrial carbon fluxes over a multi-year period.

Davis, K.J.; Richardson, S.J.; Miles, N.L.

2007-03-09T23:59:59.000Z

66

Thermally Forced Low Froude Number Flow past Three-Dimensional Obstacles  

Science Conference Proceedings (OSTI)

The present study extends the discussion of the flow of a density-stratified fluid past three-dimensional obstacles for Froude number O(1) to flows past an isolated obstacle with heated/cooled surface. The study focuses on a response of thermally ...

Jon M. Reisner; Piotr K. Smolarkiewicz

1994-01-01T23:59:59.000Z

67

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 with established trends for turbulent jets. Then FLUENT was used to model the flow of silane when confined by a wall, or impinged by an obstacle such as a flat plate or a cylinder. Computer simulated concentration profiles of a silane and air mixture were analyzed to determine mixture volumes between the mixture explosive limits. For each volume of an explosive mixture, the volume of silane was determined. The volume of the flammable mixture and the amount of silane within the flammable mixture were normalized and determined as functions of obstacle radius and obstacle distance. lf the obstacle confines the entire volume, the volumes decrease as obstacle distance increases when the radial contribution dominates the volume. As the distance of the obstacle increases then the axial contribution dominates the volume so the volume increases. The volumes increase, decrease, or remain constant depending on the obstacle diameter.

Sposato, Christina F

2000-01-01T23:59:59.000Z

68

Motion planning of inspection robot suspended on overhead ground wires for obstacle-navigation  

Science Conference Proceedings (OSTI)

The purpose of inspection robot for power transmission lines is to check running state and find damages of extra-high voltage (EHV) power transmission lines equipment. The key of the control design is how to design a robot for obstacles navigation. This ... Keywords: centroid adjustment, inspection robot, obstacles navigation automatically, power transmission line

Ren Zhi-Bin; Ruan Yi; Li Zheng; Yang Yong

2009-06-01T23:59:59.000Z

69

Penalty Methods for the Solution of Discrete HJB Equations—Continuous Control and Obstacle Problems  

Science Conference Proceedings (OSTI)

In this paper, we present a novel penalty approach for the numerical solution of continuously controlled HJB equations and HJB obstacle problems. Our results include estimates of the penalization error for a class of penalty terms, and we show that variations ... Keywords: HJB equation, HJB obstacle problem, min-max problem, numerical solution, penalty method, semismooth Newton method, viscosity solution

J. H. Witte; C. Reisinger

2012-03-01T23:59:59.000Z

70

Cerenkov-like radiation in a binary superfluid flow past an obstacle H. Susanto,1  

E-Print Network (OSTI)

Cerenkov-like radiation in a binary superfluid flow past an obstacle H. Susanto,1 P. G. Kevrekidis of as a type of nonlinear Cerenkov radiation that is emitted, when the motion of the impurity is supercritical of the Cerenkov emission of phonons by a laser obstacle was reported 19 ; in a different study 20 , it has been

Susanto, Hadi

71

Observability-based local path planning and obstacle avoidance using bearing-only measurements  

Science Conference Proceedings (OSTI)

In this paper we present an observability-based local path planning and obstacle avoidance technique that utilizes an extended Kalman Filter (EKF) to estimate the time-to-collision (TTC) and bearing to obstacles using bearing-only measurements. To ensure ... Keywords: Collision avoidance, Miniature air vehicle, Observability, Path planning

Huili Yu, Rajnikant Sharma, Randal W. Beard, Clark N. Taylor

2013-12-01T23:59:59.000Z

72

A Model for the Correction of Surface Wind Data for Sheltering by Upwind Obstacles  

Science Conference Proceedings (OSTI)

Wakes behind 2D fences and 3D obstacles are reviewed with special emphasis on reduced mean wind speeds and sheltering effects. Based partly on Perera's study of wakes behind 2D fences, and assuming a Gaussian spread for wakes behind 3D obstacles, ...

Peter A. Taylor; James R. Salmon

1993-11-01T23:59:59.000Z

73

Determination of the Mean Wind Speed and Momentum Diffusivity Profiles above Tall Vegetation and Forest Canopies Using a Mass Conservation Assumption  

Science Conference Proceedings (OSTI)

A semianalytical method based on a mass conservation principle is presented for describing the transition- layer profiles of mean wind speed and momentum diffusivity and for estimating the aerodynamic characteristics of forest and tall vegetation ...

N. M. Zoumakis

1994-02-01T23:59:59.000Z

74

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

Science Conference Proceedings (OSTI)

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

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

2011-01-01T23:59:59.000Z

75

Mesoscopic model for filament orientation in growing actin networks: the role of obstacle geometry  

E-Print Network (OSTI)

Propulsion by growing actin networks is a universal mechanism used in many different biological systems. Although the core molecular machinery for actin network growth is well preserved in most cases, the geometry of the propelled obstacle can vary considerably. In recent years, filament orientation distribution has emerged as an important observable characterizing the structure and dynamical state of the growing network. Here we derive several continuum equations for the orientation distribution of filaments growing behind stiff obstacles of various shapes and validate the predicted steady state orientation patterns by stochastic computer simulations based on discrete filaments. We use an ordinary differential equation approach to demonstrate that for flat obstacles of finite size, two fundamentally different orientation patterns peaked at either +35/-35 or +70/0/-70 degrees exhibit mutually exclusive stability, in agreement with earlier results for flat obstacles of very large lateral extension. We calculate and validate phase diagrams as a function of model parameters and show how this approach can be extended to obstacles with piecewise straight contours. For curved obstacles, we arrive at a partial differential equation in the continuum limit, which again is in good agreement with the computer simulations. In all cases, we can identify the same two fundamentally different orientation patterns, but only within an appropriate reference frame, which is adjusted to the local orientation of the obstacle contour. Our results suggest that two fundamentally different network architectures compete with each other in growing actin networks, irrespective of obstacle geometry, and clarify how simulated and electron tomography data have to be analyzed for non-flat obstacle geometries.

Julian Weichsel; Ulrich S. Schwarz

2013-04-13T23:59:59.000Z

76

Could a nearby supernova explosion have caused a mass extinction?  

E-Print Network (OSTI)

We examine the possibility that a nearby supernova explosion could have caused one or more of the mass extinctions identified by palaeontologists. We discuss the likely rate of such events in the light of the recent identification of Geminga as a supernova remnant less than 100 pc away and the discovery of a millisecond pulsar about 150 pc away, and observations of SN 1987A. The fluxes of $\\gamma$ radiation and charged cosmic rays on the Earth are estimated, and their effects on the Earth's ozone layer discussed. A supernova explosion of the order of 10 pc away could be expected every few hundred million years, and could destroy the ozone layer for hundreds of years, letting in potentially lethal solar ultraviolet radiation. In addition to effects on land ecology, this could entail mass destruction of plankton and reef communities, with disastrous consequences for marine life as well. A supernova extinction should be distinguishable from a meteorite impact such as the one that presumably killed the dinosaurs.

John Ellis; David N. Schramm

1993-03-02T23:59:59.000Z

77

Infrared Emission from the Nearby Cool Core Cluster Abell 2597  

E-Print Network (OSTI)

We observed the brightest central galaxy (BCG) in the nearby (z=0.0821) cool core galaxy cluster Abell 2597 with the IRAC and MIPS instruments on board the Spitzer Space Telescope. The BCG was clearly detected in all Spitzer bandpasses, including the 70 and 160 micron wavebands. We report aperture photometry of the BCG. The spectral energy distribution exhibits a clear excess in the FIR over a Rayleigh-Jeans stellar tail, indicating a star formation rate of ~4-5 solar masses per year, consistent with the estimates from the UV and its H-alpha luminosity. This large FIR luminosity is consistent with that of a starburst or a Luminous Infrared Galaxy (LIRG), but together with a very massive and old population of stars that dominate the energy output of the galaxy. If the dust is at one temperature, the ratio of 70 to 160 micron fluxes indicate that the dust emitting mid-IR in this source is somewhat hotter than the dust emitting mid-IR in two BCGs at higher-redshift (z~0.2-0.3) and higher FIR luminosities observed earlier by Spitzer, in clusters Abell 1835 and Zwicky 3146.

Megan Donahue; Andres Jordan; Stefi A. Baum; Patrick Cote; Laura Ferrarese; Paul Goudfrooij; Duccio Macchetto; Christopher P. O'Dea; James E. Pringle; James E. Rhoads; William B. Sparks; G. Mark Voit

2007-08-10T23:59:59.000Z

78

From Nearby to High Redshift Compact Group of Galaxies  

E-Print Network (OSTI)

Nearby Compact Groups of Galaxies (CGs) are very complex systems, tracing their history is a challenge (e.g. Stephan's Quintet). The presence of a diffuse X-rays emission that often peaks in the center of CGs shows that CGs are bound structures, they show numerous signs of interaction but their lifetime in much longer than their crossing times. Hickson CGs clearly show different stages of evolution, from weakly interacting galaxies to merging systems. CGs infalling into clusters may provide a mechanism to form clusters at high redshifts (e.g. in A1367). Massive versions of today's CGs may have been the best candidate precursors of fossil groups. Do CGs mimic the high redshift universe? This is still an open question. Indeed, their high density and low velocity dispersion should induce a high interaction rate and fast merging, CGs are nevertheless long-lived structures. On the other hand, there is probably no (or a few) isolated CGs in the high z universe. CGs may fuel high z clusters, they may produce fossil ...

Amram, P; De Oliveira, C M; Plana, H; Epinat, B; Amram, Philippe; Balkowski, Chantal; Oliveira, Claudia Mendes de; Plana, Henri; Epinat, Benoit

2006-01-01T23:59:59.000Z

79

Supernova Discoveries from the Nearby Supernova Factory (SNfactory)  

DOE Data Explorer (OSTI)

The Nearby Supernova Factory is an experiment designed to collect data on more Type Ia supernovae than have ever been studied in a single project before, and in so doing, to answer some fundamental questions about the nature of the universe. Type Ia supernovae are extraordinarily bright, remarkably uniform objects which make excellent "standard candles" for measuring the expansion rate of the universe. However, such stellar explosions are very rare, occurring only a couple of times per millenium in a typical galaxy, and remaining bright enough to detect only for a few weeks. Previous studies of Type Ia supernovae led to the discovery of the mysterious "dark energy" that is causing the universe to expand at an accelerating rate. To reduce the statistical uncertainties in previous experimental data, extensive spectral and photometric monitoring of more Type Ia supernovae is required. The SNfactory collaboration has built an automated system consisting of specialized software and custom-built hardware that systematically searches the sky for new supernovae, screens potential candidates, then performs multiple spectral and photometric observations on each supernova. These observations are stored in a database to be made available to supernova researchers world-wide for further study and analysis [copied from http://snfactory.lbl.gov/snf/snf-about.html]. Users must register and agree to the open access honor system. Finding charts are in FITS format and may not be accessible through normal browser settings.

SNfactory International Collaboration,

80

Mid-Infrared Spectral Diagnostics of Nearby Galaxies  

E-Print Network (OSTI)

The Spitzer Space Telescope is pushing into new frontiers in high redshift astronomy. Closer to home, Spitzer is making an equally large impact on our understanding of galaxy formation and evolution. In this contribution we present mid-infrared diagnostics based largely on data from the Spitzer Infrared Nearby Galaxies Survey (SINGS). Our main result is that these mid-infrared diagnostics effectively constrain a target's dominant power source. The combination of a high ionization line index and PAH strength serves as an efficient discriminant between AGN and star-forming nuclei, confirming progress made with ISO spectroscopy on starbursting and ultraluminous infrared galaxies. The sensitivity of Spitzer allows us to probe fainter nuclei and star-forming regions within galaxy disks. We find that both star-forming nuclei and extranuclear regions stand apart from nuclei that are powered by Seyfert or LINER activity. In fact, we identify areas within three diagnostic diagrams containing >90% Seyfert/LINER nuclei or >90% HII regions/HII nuclei. We also find that, compared to starbursting nuclei, extranuclear regions typically separate even further from AGN, especially for low-metallicity extranuclear environments. In addition, instead of the traditional mid-infrared approach to differentiating between AGN and star-forming sources that utilizes relatively weak high-ionization lines, we show that strong low-ionization cooling lines of X-ray dominated regions like [SiII] 34.82 micron can alternatively be used as excellent discrimants.

Daniel A. Dale; the SINGS Team

2006-04-01T23:59:59.000Z

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.


81

Mesoscopic model for filament orientation in growing actin networks: the role of obstacle geometry  

E-Print Network (OSTI)

Propulsion by growing actin networks is a universal mechanism used in many different biological systems. Although the core molecular machinery for actin network growth is well preserved in most cases, the geometry of the propelled obstacle can vary considerably. In recent years, filament orientation distribution has emerged as an important observable characterizing the structure and dynamical state of the growing network. Here we derive several continuum equations for the orientation distribution of filaments growing behind stiff obstacles of various shapes and validate the predicted steady state orientation patterns by stochastic computer simulations based on discrete filaments. We use an ordinary differential equation approach to demonstrate that for flat obstacles of finite size, two fundamentally different orientation patterns peaked at either +35/-35 or +70/0/-70 degrees exhibit mutually exclusive stability, in agreement with earlier results for flat obstacles of very large lateral extension. We calculat...

Weichsel, Julian; 10.1088/1367-2630/15/3/035006

2013-01-01T23:59:59.000Z

82

Numerical Study on Flow Pass of a Three-Dimensional Obstacle under a Strong Stratification Condition  

Science Conference Proceedings (OSTI)

A three-dimensional, nonhydrostatic, numerical turbulent model was used to study the flow pass of a three-dimensional obstacle under a strong stratification condition. The numerical results clarify the behavior of the flow at a low Froude number, ...

W. Sha; K. Nakabayashi; H. Ueda

1998-10-01T23:59:59.000Z

83

Droplet Breakup in Flow Past an Obstacle: A Capillary Instability Due to Permeability Variations  

E-Print Network (OSTI)

In multiphase flow in confined geometries an elementary event concerns the interaction of a droplet with an obstacle. As a model of this configuration we study the collision of a droplet with a circular post that spans a ...

Protičre, S.

84

Ionized gas and stellar kinematics of seventeen nearby spiral galaxies  

E-Print Network (OSTI)

Ionized gas and stellar kinematics have been measured along the major axes of seventeen nearby spiral galaxies of intermediate to late morphological type. We discuss the properties of each sample galaxy distinguishing between those characterized by regular or peculiar kinematics. In most of the observed galaxies ionized gas rotates more rapidly than stars and have a lower velocity dispersion, as is to be expected if the gas is confined in the disc and supported by rotation while the stars are mostly supported by dynamical pressure. In a few objects, gas and stars show almost the same rotational velocity and low velocity dispersion, suggesting that their motion is dominated by rotation. Incorporating the spiral galaxies studied by Bertola et al. (1996), Corsini et al. (1999, 2003) and Vega Beltran et al. (2001) we have compiled a sample of 50 S0/a-Scd galaxies, for which the major-axis kinematics of the ionized gas and stars have been obtained with the same spatial (~1'') and spectral (~50km/s) resolution, and measured with the same analysis techniques. This allowed us to address the frequency of counterrotation in spiral galaxies. It turns out that less than 12% and less than 8% (at the 95% confidence level) of the sample galaxies host a counterrotating gaseous and stellar disc, respectively. The comparison with S0 galaxies suggests that the retrograde acquisition of small amounts of external gas gives rise to counterrotating gaseous discs only in gas-poor S0s, while in gas-rich spirals the newly acquired gas is swept away by the pre-existing gas. Counterrotating gaseous and stellar discs in spirals are formed only from the retrograde acquisition of large amounts of gas exceeding that of pre-existing gas, and subsequent star formation, respectively.

A. Pizzella; E. M. Corsini; J. C. Vega-Beltran; F. Bertola

2004-04-28T23:59:59.000Z

85

Obstacles, Slopes, and Tic-Tac-Toe: An excursion in discrete geometry and combinatorial game theory  

E-Print Network (OSTI)

A drawing of a graph is said to be a {\\em straight-line drawing} if the vertices of $G$ are represented by distinct points in the plane and every edge is represented by a straight-line segment connecting the corresponding pair of vertices and not passing through any other vertex of $G$. The minimum number of slopes in a straight-line drawing of $G$ is called the slope number of $G$. We show that every cubic graph can be drawn in the plane with straight-line edges using only the four basic slopes $\\{0,\\pi/4,\\pi/2,-\\pi/4\\}$. We also prove that four slopes have this property if and only if we can draw $K_4$ with them. Given a graph $G$, an {\\em obstacle representation} of $G$ is a set of points in the plane representing the vertices of $G$, together with a set of obstacles (connected polygons) such that two vertices of $G$ are joined by an edge if and only if the corresponding points can be connected by a segment which avoids all obstacles. The {\\em obstacle number} of $G$ is the minimum number of obstacles in a...

Mukkamala, V S Padmini

2011-01-01T23:59:59.000Z

86

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

E-Print Network (OSTI)

Buildings are a major consumer of energy and thus have a significant impact on the environment. The use of artificial lights is a major contributor to the energy usage in a typical office building using electricity to run the lights and also 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 consumption in a typical tall office building in Dubai-UAE is used to optimize the effectiveness of natural lighting penetration and calculate the associated energy savings. Two alternative building designs are proposed and tested. The overall energy savings for the whole building reached 31.4 % for the proposed oval shaped design. This represents a significant reduction in the buildings electricity load and thus its impact on the environment.

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

2010-01-01T23:59:59.000Z

87

Dependence of Wind Turbine Curves on Atmospheric Stability Regimes - An Analysis of a West Coast North American Tall Wind Farm  

DOE Green Energy (OSTI)

Tall wind turbines, with hub heights at 80 m or above, can extract large amounts of energy from the atmosphere because they are likely to encounter higher wind speeds, but they face challenges given the complex nature of wind flow in the boundary layer. Depending on whether the boundary layer is stable, convective or neutral, mean wind speed (U) and turbulence ({sigma}{sub U}) may vary greatly across the tall turbine swept area (40 m to 120 m). This variation can cause a single turbine to produce difference amounts of power during time periods of identical hub height wind speeds. The study examines the influence that atmospheric mixing or stability has on power output at a West Coast North American wind farm. They first examine the accuracy and applicability of two, relatively simple stability parameters, the wind shear-exponent, {alpha}, and the turbulence intensity, I{sub u}, against the physically-based, Obukhov length, L, to describe the wind speed and turbulence profiles in the rotor area. In general, the on-site stability parameters {alpha} and I{sub u} are in high agreement with the off-site, L stability scale parameter. Next, they divide the measurement period into five stability classes (strongly stable, stable, neutral, convective, and strongly convective) to discern stability-effects on power output. When only the mean wind speed profile is taken into account, the dependency of power output on boundary layer stability is only subtly apparent. When turbulence intensity I{sub u} is considered, the power generated for a given wind speed is twenty percent higher during strongly stable conditions than during strongly convective conditions as observed in the spring and summer seasons at this North American wind farm.

Wharton, S; Lundquist, J K; Sharp, J; Zulauf, M

2009-08-24T23:59:59.000Z

88

Project #: UM08-Q3Saving among Low-Income Women: Motivation and Obstacles  

E-Print Network (OSTI)

How do low-income households think about saving? What motivations do they identify for saving, and what obstacles to meeting their goals? We use data from qualitative interviews with 51 households in Detroit to shed light on these questions. We find that they wish they could save- primarily for protection against the unexpected or to put children through college- but that most of them cannot. Friends and family surface as a major obstacle to saving, since those who have liquid assets are asked for help. When savings is feasible in this population, it occurs

Helen Levy; Kristin Seefeldt; Helen Levy; Kristin Seefeldt; Ann Arbor; Andrea Fischer Newman; Ann Arbor; Andrew C. Richner; Grosse Pointe; Park S. Martin; Helen Levy; Kristin Seefeldt

2008-01-01T23:59:59.000Z

89

A sonar approach to obstacle detection for a vision-based autonomous wheelchair  

Science Conference Proceedings (OSTI)

An advanced prototype Computer Controlled Power Wheelchair Navigation System or CCPWNS has been developed to provide autonomy for highly disabled users, whose mix of disabilities makes it difficult or impossible to control their own power chairs in their ... Keywords: Control systems, Estimation using vision, Robotics, Sonar Obstacle Detection, Wheeled robots

Guillermo Del Castillo; Steven Skaar; Antonio Cardenas; Linda Fehr

2006-12-01T23:59:59.000Z

90

Real-Time Obstacle Avoidance Method for Mobile Robots Based on a Modified Particle Swarm Optimization  

Science Conference Proceedings (OSTI)

A novel method for the robot path planning in dynamic environment is presented in this paper. Based on the analysis of visual modeling, the reason of premature convergence and diversity loss in PSO is explained, and a new modified algorithm is proposed ... Keywords: Obstacle Avoidance, Particle Swarm Optimization, path planning

Yuxin Zhao; Wei Zu

2009-04-01T23:59:59.000Z

91

Large-Eddy Simulation of Flow over Two-Dimensional Obstacles: High Drag States and Mixing  

Science Conference Proceedings (OSTI)

A three-dimensional large-eddy simulation (LES) model was used to examine how stratified flow interacts with bottom obstacles in the coastal ocean. Bottom terrain representing a 2D ridge was modeled using a finite-volume approach with ridge ...

Eric D. Skyllingstad; Hemantha W. Wijesekera

2004-01-01T23:59:59.000Z

92

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

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

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

93

Two sides of probe method and obstacle with impedance boundary condition  

E-Print Network (OSTI)

An inverse boundary value problem for the Helmholtz equation in a bounded domain is considered. The problem is to extract information about an unknown obstacle embedded in the domain with unknown impedance boundary condition (the Robin condition) from the associated Dirichlet-to-Neumann map. The main result is a characterization of the unknown obstacle via the sequences that are constructed by the Dirichlet-to-Neumann map, under smallness conditions on the wave number and the upper bound of the impedance. Moreover two alternative simple proofs of a previous result of Cheng-Liu-Nakamura which are based on only some energy estimates, an analysis of the blowup of the energy of so-called reflected solutions and an application of the enclosure method to the problem are also given.

Masaru Ikehata

2006-11-08T23:59:59.000Z

94

Bogoliubov-Cerenkov Radiation in a Bose-Einstein Condensate Flowing against an Obstacle  

SciTech Connect

We study the density modulation that appears in a Bose-Einstein condensate flowing with supersonic velocity against an obstacle. The experimental density profiles observed at JILA are reproduced by a numerical integration of the Gross-Pitaevskii equation and then interpreted in terms of Cerenkov emission of Bogoliubov excitations by the defect. The phonon and the single-particle regions of the Bogoliubov spectrum are, respectively, responsible for a conical wave front and a fan-shaped series of precursors.

Carusotto, I. [CNR-BEC-INFM, Trento, I-38050 Povo (Italy); Hu, S. X.; Collins, L. A. [Los Alamos National Laboratory, Los Alamos, New Mexico 87544 (United States); Smerzi, A. [Los Alamos National Laboratory, Los Alamos, New Mexico 87544 (United States); CNR-BEC-INFM, Trento, I-38050 Povo (Italy)

2006-12-31T23:59:59.000Z

95

Investing in Russia`s oil and gas industry: The legal and bureaucratic obstacles  

SciTech Connect

This article discusses the unusual challenges the international oil companies have as they consider investing in the oil and gas industry of the Russian Federation. Topics include the following: Russian oil and gas reserves; the Russian legislative process; law on subsurface resources; regulations on licensing procedure; draft law on oil and gas; draft law on concessions; proposed modification draft legislation; obstacles to wide scale investment.

Skelton, J.W. Jr. [Conoco, Inc., Houston, TX (United States)

1993-12-31T23:59:59.000Z

96

Multi-layer approach to motion planning in obstacle rich environment  

E-Print Network (OSTI)

A widespread use of robotic technology in civilian and military applications has generated a need for advanced motion planning algorithms that are real-time implementable. These algorithms are required to navigate autonomous vehicles through obstacle-rich environments. This research has led to the development of the multilayer trajectory generation approach. It is built on the principle of separation of concerns, which partitions a given problem into multiple independent layers, and addresses complexity that is inherent at each level. We partition the motion planning algorithm into a roadmap layer and an optimal control layer. At the roadmap layer, elements of computational geometry are used to process the obstacle rich environment and generate feasible sets. These are used by the optimal control layer to generate trajectories while satisfying dynamics of the vehicle. The roadmap layer ignores the dynamics of the system, and the optimal control layer ignores the complexity of the environment, thus achieving a separation of concern. This decomposition enables computationally tractable methods to be developed for addressing motion planning in complex environments. The approach is applied in known and unknown environments. The methodology developed in this thesis has been successfully applied to a 6 DOF planar robotic testbed. Simulation results suggest that the planner can generate trajectories that navigate through obstacles while satisfying dynamical constraints.

Kim, Sung Hyun

2008-05-01T23:59:59.000Z

97

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

E-Print Network (OSTI)

The evaluation of the potential hazards related with the operation of an LNG terminal includes possible release scenarios with the consequent flammable vapor dispersion within the facility; therefore, it is important to know the behavior of this phenomenon through the application of advanced simulation tools. Computational Fluid Dynamic (CFD) tools are often used to estimate the exclusion zones in an event of accidental LNG spill. In practice these releases are more likely to occur in the confines of complex geometries with solid obstacles such as LNG terminals, and LNG processing plants. The objective of this research is to study the effects that different obstacles have over the LNG vapor dispersion and the safety distance reduction caused 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, to improve the design of passive barriers, and for designing better layout configurations for storage tanks. Simulations results performed with FLACS (Flame Acceleration Simulator), a CFD solver, confirmed that these applications help to reduce safety distances.

Ruiz Vasquez, Roberto

2012-08-01T23:59:59.000Z

98

Imaging Polarimetry of Nearby Molecular Ramaprakash A. N., Tandon S. N. and Gupta R.  

E-Print Network (OSTI)

Imaging Polarimetry of Nearby Molecular Clouds Ramaprakash A. N., Tandon S. N. and Gupta R. Inter samples (Sen & Tandon 1994). With the introduction of the imaging methods in polarimetry the situation the instrument can be employed to study the local ISM. #12; 2 Ramaprakash A. N., Tandon S. N. and Gupta R. 2

Ramaprakash, A. N.

99

Erosion damage of nearby plasma-facing components during a disruption on the divertor plate  

SciTech Connect

Intense energy flow from the disrupting plasma during, a thermal quench will cause a sudden vapor cloud to form above the exposed divertor area. The vapor-cloud layer has been proved to significantly reduce the subsequent energy flux of plasma particles to the original disruption location. However, most of the incoming plasma energy is quickly converted to intense photon radiation emitted by heating of the vapor cloud. This radiation energy can cause serious erosion damage of nearby components not directly exposed to the disrupting, plasma. The extent of this ``secondary damage`` will depend on the divertor design, disrupting plasma parameters, and design of nearby components. The secondary erosion damage of these components due to intense radiation can exceed that of the original disruption location.

Hassanein, A. [Argonne National Lab., IL (United States); Konkashbaev, I. [Troitsk Inst. for Innovation and Fusion Research (Russian Federation)

1996-09-01T23:59:59.000Z

100

Probing the Magnetic Fields of Nearby Spiral Galaxies at Low Frequencies with LOFAR  

E-Print Network (OSTI)

While the Low Frequency Array (LOFAR) is still in its commissioning phase, early science results are starting to emerge. Two nearby galaxies, M51 and NGC4631, have been observed as part of the Magnetism Key Science Project's (MKSP) effort to increase our understanding of the nature of weak magnetic fields in galaxies. LOFAR and the complexity of its calibration as well as the aims and goals of the MKSP are presented.

Mulcahy, D D; Adebahr, B; Anderson, J; Beck, R; Bell, M R; Chyzy, K; Giessuebel, R; Heald, G; Horneffer, A; Jurusik, W; Pizzo, R; Scaife, A; Sotomayor-Beltran, C; Nikiel-Wroczynski, B

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.


101

Bayesian analysis to identify very low-mass members of nearby young stellar kinematic groups  

E-Print Network (OSTI)

We describe our all-sky survey for >M4 candidate members to nearby, young associations from the 2MASS and WISE catalogs using bayesian inference. We report the first results, including 38 highly probable candidates showing spectroscopic signs of low-gravity (and thus youth). The latest of these objects would correspond to a 11 - 13 MJup object, around the limit of the planetary regime.

Gagné, Jonathan; Doyon, René; Malo, Lison; Faherty, Jacqueline; Artigau, Étienne

2013-01-01T23:59:59.000Z

102

Cerenkov-like radiation in a binary Schr{ö}dinger flow past an obstacle  

E-Print Network (OSTI)

We consider the dynamics of two coupled miscible Bose-Einstein condensates, when an obstacle is dragged through them. The existence of two different speeds of sound provides the possibility for three dynamical regimes: when both components are subcritical, we do not observe nucleation of coherent structures; when both components are supercritical they both form dark solitons in one dimension (1D) and vortices or rotating vortex dipoles in two dimensions (2D); in the intermediate regime, we observe the nucleation of a structure in the form of a dark-antidark soliton in 1D; subcritical component; the 2D analog of such a structure, a vortex-lump, is also observed.

H. Susanto; P. G. Kevrekidis; R. Carretero-Gonzalez; B. A. Malomed; D. J. Frantzeskakis; A. R. Bishop

2007-01-18T23:59:59.000Z

103

Impact of random obstacles on the dynamics of a dense colloidal fluid  

E-Print Network (OSTI)

Using molecular dynamics simulations we study the slow dynamics of a colloidal fluid annealed within a matrix of obstacles quenched from an equilibrated colloidal fluid. We choose all particles to be of the same size and to interact as hard spheres, thus retaining all features of the porous confinement while limiting the control parameters to the packing fraction of the matrix, {\\Phi}m, and that of the fluid, {\\Phi}f. We conduct detailed investigations on several dynamic properties, including the tagged-particle and collective intermediate scattering functions, the mean-squared displacement, and the van Hove function. We show the confining obstacles to profoundly impact the relaxation pattern of various quantifiers pertinent to the fluid. Varying the type of quantifier (tagged-particle or collective) as well as {\\Phi}m and {\\Phi}f, we unveil both discontinuous and continuous arrest scenarios. Furthermore, we discover subdiffusive behavior and demonstrate its close connection to the matrix structure. Our findings partly confirm the various predictions of a recent extension of mode-coupling theory to the quenched-annealed protocol.

Jan Kurzidim; Daniele Coslovich; Gerhard Kahl

2010-07-02T23:59:59.000Z

104

The Prediction of Nearshore Wind-induced Surface Currents from Wind Velocities Measured at Nearby Land Stations  

Science Conference Proceedings (OSTI)

This paper aims to find a fast and efficient way to predict the wind-induced components of surface currents in a nearshore coastal area of several hundred square kilometers from wind velocities measured at nearby land stations. Ocean Surface ...

Betty Ng

1993-08-01T23:59:59.000Z

105

Mining the SDSS archive. I. Photometric redshifts in the nearby universe  

E-Print Network (OSTI)

We present a supervised neural network approach to the determination of photometric redshifts. The method was tuned to match the characteristics of the Sloan Digital Sky Survey and it exploits the spectroscopic redshifts provided by this unique survey. In order to train, validate and test the networks we used two galaxy samples drawn from the SDSS spectroscopic dataset: the general galaxy sample (GG) and the luminous red galaxies subsample (LRG). The method consists of a two steps approach. In the first step, objects are classified in nearby (ztrained on objects belonging to the two redshift ranges. Using a standard MLP operated in a Bayesian framework, the optimal architectures were found to require 1 hidden layer of 24 (24) and 24 (25) neurons for the GG (LRG) sample. The presence of systematic deviations was then corrected by interpolating the resulting redshifts. The final results on the GG dataset give a robust sigma_z = 0.0208 over the redshift range [0.01, 0.48] and sigma_z = 0.0197 and sigma_z = 0.0238 for the nearby and distant samples respectively. For the LRG subsample we find a robust sigma_z = 0.0164 over the whole range, and sigma_z = 0.0160, sigma_z = 0.0183 for the nearby and distant samples respectively. After training, the networks have been applied to all objects in the SDSS Table GALAXY matching the same selection criteria adopted to build the base of knowledge, and photometric redshifts for ca. 30 million galaxies having z<0.5 were derived. A catalogue containing photometric redshifts for the LRG subsample was also produced.

D'Abrusco Raffaele; Staiano Antonino; Longo Giuseppe; Brescia Massimo; Paolillo Maurizio; De Filippis Elisabetta; Tagliaferri Roberto

2007-03-06T23:59:59.000Z

106

TRACING COLD H I GAS IN NEARBY, LOW-MASS GALAXIES  

SciTech Connect

We analyze line-of-sight atomic hydrogen (H I) line profiles of 31 nearby, low-mass galaxies selected from the Very Large Array-ACS Nearby Galaxy Survey Treasury (VLA-ANGST) and The H I Nearby Galaxy Survey (THINGS) to trace regions containing cold (T {approx}< 1400 K) H I from observations with a uniform linear scale of 200 pc beam{sup -1}. Our galaxy sample spans four orders of magnitude in total H I mass and nine magnitudes in M{sub B} . We fit single and multiple component functions to each spectrum to isolate the cold, neutral medium given by a low-dispersion (<6 km s{sup -1}) component of the spectrum. Most H I spectra are adequately fit by a single Gaussian with a dispersion of 8-12 km s{sup -1}. Cold H I is found in 23 of 27 ({approx}85%) galaxies after a reduction of the sample size due to quality-control cuts. The cold H I contributes {approx}20% of the total line-of-sight flux when found with warm H I. Spectra best fit by a single Gaussian, but dominated by cold H I emission (i.e., have velocity dispersions of <6 km s{sup -1}), are found primarily beyond the optical radius of the host galaxy. The cold H I is typically found in localized regions and is generally not coincident with the very highest surface density peaks of the global H I distribution (which are usually areas of recent star formation). We find a lower limit for the mass fraction of cold-to-total H I gas of only a few percent in each galaxy.

Warren, Steven R.; Skillman, Evan D. [Minnesota Institute for Astrophysics, University of Minnesota, 116 Church Street SE, Minneapolis, MN 55455 (United States); Stilp, Adrienne M.; Dalcanton, Julianne J. [Department of Astronomy, Box 351580, University of Washington, Seattle, WA 98195 (United States); Ott, Juergen [National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903 (United States); Walter, Fabian [Max Planck Institut fuer Astronomie, Koenigstuhl 17, D-69117 Heidelberg (Germany); Petersen, Eric A. [Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, IL 61801 (United States); Koribalski, Baerbel [Australia Telescope National Facility, CSIRO Astronomy and Space Science, P.O. Box 76, Epping NSW 1710 (Australia); West, Andrew A., E-mail: warren@astro.umn.edu, E-mail: skillman@astro.umn.edu, E-mail: adrienne@astro.washington.edu, E-mail: jd@astro.washington.edu, E-mail: jott@nrao.edu, E-mail: walter@mpia.de, E-mail: eapeter2@illinois.edu, E-mail: Baerbel.Koribalski@csiro.au, E-mail: aawest@bu.edu [Department of Astronomy, Boston University, 725 Commonwealth Avenue, Boston, MA 02215 (United States)

2012-09-20T23:59:59.000Z

107

Obstacles to US ability to control and track weapons-grade uranium supplied abroad  

SciTech Connect

The United States has exported over 16,000 kilograms of highly enriched uranium for use in research reactors in over 40 nations. GAO learned that the central computerized system used for tracking such exports is incomplete and inaccurate. Intended users also consider it inadequate and unreliable. In addition, three other systems gather information on highly enriched uranium. GAO recommends streamlining and consolidating the information maintained on this material in a more accurate, comprehensive, and flexible manner. GAO believes that reducing the use of highly enriched uranium is a sound non-proliferation objective. A number of obstacles, however, must be overcome if the conversion of research reactors to non-weapons grade fuels is to become a reality in the next few years. In the meantime, US ability to ensure adequate physical protection of highly enriched uranium supplied abroad is limited and international safeguards of nuclear material need further improvement.

Bowsher, C.A.

1982-08-02T23:59:59.000Z

108

Ionized gas velocity dispersion in nearby dwarf galaxies: looking at supersonic turbulent motions  

E-Print Network (OSTI)

We present the results of ionized gas turbulent motions study in several nearby dwarf galaxies using a scanning Fabry-Perot interferometer with the 6-m telescope of the SAO RAS. Combining the `intensity-velocity dispersion' diagrams (I-sigma) with two-dimensional maps of radial velocity dispersion we found a number of common patterns pointing to the relation between the value of chaotic ionized gas motions and processes of current star formation. In five out of the seven analysed galaxies we identified expanding shells of ionized gas with diameters of 80-350 pc and kinematic ages of 1-4 Myr. We also demonstrate that the I-sigma diagrams may be useful for the search of supernova remnants, other small expanding shells or unique stars in nearby galaxies. As an example, a candidate luminous blue variable (LBV) was found in UGC 8508. We propose some additions to the interpretation, previously used by Munoz-Tunon et al. to explain the I-sigma diagrams for giant star formation regions. In the case of dwarf galaxies,...

Moiseev, Alexei

2012-01-01T23:59:59.000Z

109

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

110

Numerical Simulations of Upstream Blocking, Columnar Disturbances, and Bores in Stably Stratified Shear Flows over an Obstacle  

Science Conference Proceedings (OSTI)

A two-dimensional, nonhydrostatic, elastic numerical model has been used to study the generation of gravity waves for a stably stratified shear flow over an obstacle. When a low-level wind shear is included in the simulation, we find that the ...

Chaing Chen; James W. Rottman; Steven E. Koch

1994-11-01T23:59:59.000Z

111

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

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

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;

112

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

113

Mining the SDSS archive. I. Photometric redshifts in the nearby universe  

E-Print Network (OSTI)

We present a supervised neural network approach to the determination of photometric redshifts. The method was tuned to match the characteristics of the Sloan Digital Sky Survey and it exploits the spectroscopic redshifts provided by this unique survey. In order to train, validate and test the networks we used two galaxy samples drawn from the SDSS spectroscopic dataset: the general galaxy sample (GG) and the luminous red galaxies subsample (LRG). The method consists of a two steps approach. In the first step, objects are classified in nearby (ztrained on objects belonging to the two redshift ranges. Using a standard MLP operated in a Bayesian framework, the optimal architectures were found to require 1 hidden layer of 24 (24) and 24 (25) neurons for the GG (LRG) sample. The presence of systematic deviations was then corrected by interpolating the resulting redshifts. The final results on the GG dataset give a r...

Raffaele, D A; Giuseppe, L; Massimo, B; Maurizio, P; Elisabetta, D F; Roberto, T; Antonino, Staiano; Giuseppe, Longo; Massimo, Brescia; Maurizio, Paolillo; Elisabetta, De Filippis; Roberto, Tagliaferri

2007-01-01T23:59:59.000Z

114

AGE DETERMINATION FOR 346 NEARBY STARS IN THE HERSCHEL DEBRIS SURVEY  

SciTech Connect

DEBRIS is a flux-limited survey of nearby stars (spectral types A-M) for evidence of debris disks with the Herschel Space Observatory. One goal of the survey is to determine disk incidence as a function of various stellar parameters. Understanding debris disk evolution depends on knowledge of the precise age of stars around which these debris disks are found. However, finding ages for field stars is notoriously difficult. Furthermore, in an unbiased sample like DEBRIS, one is working with stars across many spectral types. This requires a multi-method approach to age determination. In this paper, we outline several methods of age determination broken down by spectral type, including some strengths and limitations of each method. In total, we were able to calculate ages for 263 of 274 F-, G-, and K-type stars, and all 83 A-type stars in the DEBRIS sample.

Vican, Laura, E-mail: lvican@astro.ucla.edu [Department of Physics and Astronomy, University of California, Los Angeles, CA 90095 (United States)

2012-06-15T23:59:59.000Z

115

THE CONTRIBUTION OF TP-AGB STARS TO THE MID-INFRARED COLORS OF NEARBY GALAXIES  

SciTech Connect

We study the mid-infrared color space of 30 galaxies from the Spitzer Infrared Nearby Galaxies Survey (SINGS) survey for which Sloan Digital Sky Survey data are also available. We construct two-color maps for each galaxy and compare them to results obtained from combining Maraston evolutionary synthesis models, galactic thermally pulsating asymptotic giant branch (TP-AGB) colors, and smooth star formation histories. For most of the SINGS sample, the spatially extended mid-IR emission seen by Spitzer in normal galaxies is consistent with our simple model in which circumstellar dust from TP-AGB stars dominates at 8 and 24 {mu}m. There is a handful of exceptions that we identify as galaxies that have high star formation rates presumably with star formation histories that cannot be assumed to be smooth, or anemic galaxies, which were depleted of their H I at some point during their evolution and have very low ongoing star formation rates.

Chisari, Nora E. [Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ 08544 (United States); Kelson, Daniel D., E-mail: nchisari@astro.princeton.edu [Observatories of the Carnegie Institution of Science, 813 Santa Barbara St., Pasadena, CA 91101 (United States)

2012-07-10T23:59:59.000Z

116

Chlorine and Sulfur in Nearby Planetary Nebulae and H II Regions  

E-Print Network (OSTI)

We derive the chlorine abundances in a sample of nearby planetary nebulae (PNe) and H II regions that have some of the best available spectra. We use a nearly homogeneous procedure to derive the abundance in each object and find that the Cl/H abundance ratio shows similar values in H II regions and PNe. This supports our previous interpretation that the underabundance we found for oxygen in the H II regions is due to the depletion of their oxygen atoms into organic refractory dust components. For other elements, the bias introduced by ionization correction factors in their derived abundances can be very important, as we illustrate here for sulfur using photoionization models. Even for low-ionization PNe, the derived sulfur abundances can be lower than the real ones by up to 0.3 dex, and the differences found with the abundances derived for H II regions that have similar S/H can reach 0.4 dex.

Rodríguez, Mónica

2011-01-01T23:59:59.000Z

117

Correlation of the highest energy cosmic rays with nearby extragalactic objects  

E-Print Network (OSTI)

Using data collected at the Pierre Auger Observatory during the past 3.7 years, we demonstrated a correlation between the arrival directions of cosmic rays with energy above ~ 6x10^{19} electron volts and the positions of active galactic nuclei (AGN) lying within ~ 75 megaparsecs. We rejected the hypothesis of an isotropic distribution of these cosmic rays with at least a 99% confidence level from a prescribed a priori test. The correlation we observed is compatible with the hypothesis that the highest energy particles originate from nearby extragalactic sources whose flux has not been substantially reduced by interaction with the cosmic background radiation. AGN or objects having a similar spatial distribution are possible sources.

The Pierre Auger Collaboration

2007-11-14T23:59:59.000Z

118

An Unbiased Survey of 500 Nearby Stars for Debris Disks: A JCMT Legacy Program  

E-Print Network (OSTI)

We present the scientific motivation and observing plan for an upcoming detection survey for debris disks using the James Clerk Maxwell Telescope. The SCUBA-2 Unbiased Nearby Stars (SUNS) Survey will observe 500 nearby main sequence and sub-giant stars (100 of each of the A, F, G, K and M spectral classes) to the 850 micron extragalactic confusion limit to search for evidence of submillimeter excess, an indication of circumstellar material. The survey distance boundaries are 8.6, 16.5, 22, 25 and 45 pc for M, K, G, F and A stars, respectively, and all targets lie between the declinations of -40 deg to 80 deg. In this survey, no star will be rejected based on its inherent properties: binarity, presence of planetary companions, spectral type or age. This will be the first unbiased survey for debris disks since IRAS. We expect to detect ~125 debris disks, including ~50 cold disks not detectable in current shorter wavelength surveys. A substantial amount of complementary data will be required to constrain the temperatures and masses of discovered disks. High resolution studies will likely be required to resolve many of the disks. Therefore, these systems will be the focus of future observational studies using a variety of observatories to characterize their physical properties. For non-detected systems, this survey will set constraints (upper limits) on the amount of circumstellar dust, of typically 200 times the Kuiper Belt mass, but as low as 10 times the Kuiper Belt mass for the nearest stars in the sample (approximately 2 pc).

B. C. Matthews; J. S. Greaves; W. S. Holland; M. C. Wyatt; M. J. Barlow; P. Bastien; C. A. Beichman; A. Biggs; H. M. Butner; W. R. F. Dent; J. Di Francesco; C. Dominik; L. Fissel; P. Friberg; A. G. Gibb; M. Halpern; R. J. Ivison; R. Jayawardhana; T. Jenness; D. Johnstone; JJ Kavelaars; J. L. Marshall; N. Phillips; G. Schieven; I. A. G. Snellen; H. J. Walker; D. Ward-Thompson; B. Weferling; G. J. White; J. Yates; M. Zhu

2007-07-03T23:59:59.000Z

119

Overcoming Obstacles to Mobility for Apprentices and Other Young People in Vocational Education and Training Final Report  

E-Print Network (OSTI)

This document acts as the final report of the ‘Study on the obstacles to transnational mobility faced apprentices and other young people in initial vocational training and on ways of overcoming them ’ also referred to as the MoVE-iT project. The report was financed and prepared for the use of the European Commission, Directorate-General for Education and Culture under contract nr 2005-4579/001 PIL-PILOTP.

unknown authors

2007-01-01T23:59:59.000Z

120

A Census of Broad-Line Active Galactic Nuclei in Nearby Galaxies: Coeval Star Formation and Rapid Black Hole Growth  

E-Print Network (OSTI)

We present the first quantified, statistical map of broad-line active galactic nucleus (AGN) frequency with host galaxy color and stellar mass in nearby (0.01 nuclear activity also efficiently form stars. The data favor processes that simultaneously fuel both star formation activity and rapid superm...

Trump, Jonathan R; Fang, Jerome J; Faber, S M; Koo, David C; Kocevski, Dale D

2012-01-01T23:59:59.000Z

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

Comparison of experimental and computed solids motion and bed dynamics for fluidized beds containing obstacles  

SciTech Connect

The ensemble- and time-averaged solids velocity field and bed dynamics in the form of pressure oscillations taken in the University of Illinois at Urbana-Champaign's (UIUC) atmospheric thin (3.81 by 40 cm) bubbling fluidized bed which contained a simulated triangular pitch tube array consisting of five round 5.08 cm diameter cylinders are analyzed in this paper using Argonne National Laboratory's hydrodynamic model FLUFIX implemented on its CRAY-XMP supercomputer. The bed material consisted of soda lime glass beads having a narrow size range averaging 460 {mu}m in diameter. The fluidizing air was introduced at 39 cm/s. Generally correct solids motion is predicted by the FLUFIX computer program. The uncertainties in the UIUC solids motion data vary greatly from location to location; hence, a sensitivity analysis was performed varying the inlet fluidizing gas velocity distribution. A convergence study was performed by varying (1) the size of the mesh used to approximate the obstacles, and (2) the accuracy of the numerical solution. The authors demonstrate essential grid independence for time-averaged axial solids velocities and porosities for the tubes modeled as 2 {times} 2 and 4 {times} 4 squares and a very tight convergence. Good agreement is obtained for the power spectra of the absolute pressure fluctuations using the Fast Fourier Transform (FFT) technique. The computed and experimental major frequencies lie in a relatively narrow range of 2-3 Hz. Computer animations of the computer simulations qualitatively visualize features of the bed dynamics including bubble formation from the tubes, bed expansion and collapse and side-to-side sloshing. Solids motion and the associated bed dynamics are the key to understanding the erosion processes in fluidized-bed combustors. 7 refs., 12 figs., 3 tabs.

Lyczkowski, R.W.; Gamwo, I.K.; Dobran, F. (Argonne National Lab., IL (USA)); Ai, Y.H.; Chao, B.T.; Chen, M.M. (Illinois Univ., Urbana, IL (USA). Dept. of Mechanical and Industrial Engineering)

1991-01-01T23:59:59.000Z

122

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

Science Conference Proceedings (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

123

SPATIALLY RESOLVED SPECTROSCOPIC STAR FORMATION HISTORIES OF NEARBY DISKS: HINTS OF STELLAR MIGRATION  

SciTech Connect

We use the Mitchell Spectrograph (formerly VIRUS-P) to observe 12 nearby disk galaxies. We successfully measure ages in the outer disk in six systems. In three cases (NGC 2684, NGC 6155, and NGC 7437), we find that a downward break in the disk surface brightness profile corresponds with a change in the dominant stellar population with the interior being dominated by active star formation and the exterior having older stellar populations that are best fit with star formation histories that decline with time. The observed increase in average stellar ages beyond a profile break is similar to theoretical models that predict surface brightness breaks are caused by stellar migration, with the outer disk being populated from scattered old interior stars. In three more cases (IC 1132, NGC 4904, and NGC 6691), we find no significant change in the stellar population as one crosses the break radius. In these galaxies, both the inner and outer disks are dominated by active star formation and younger stellar populations. While radial migration can contribute to the stellar populations beyond the break, it appears that more than one mechanism is required to explain all of our observed stellar profile breaks.

Yoachim, Peter [Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195 (United States); Roskar, Rok [Institute for Theoretical Physics, University of Zuerich, Winterthurerstrasse 190, CH-8057 Zuerich (Switzerland); Debattista, Victor P., E-mail: yoachim@u.washington.edu [Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE (United Kingdom)

2012-06-20T23:59:59.000Z

124

Review on Seismic Rehabilitation of a 56-Story RC Tall Building having Shear Wall System Based on A Nonlinear Dynamic Performance Evaluation  

Science Conference Proceedings (OSTI)

Tehran tower is a 56 story reinforced concrete tall building consisting of three wings with identical plan dimensions each approximately 48 meters by 22 meters. The three wings are at 120 degree from each other and have no expansions/seismic Joints. This paper contains the consideration of the retrofitting of the Tehran tower based on the findings of an exhaustive investigation of the nonlinear performance evaluation efforts. It has tried to show the procedure followed, methodologies utilized, and the results obtained for life-safety and collapse-prevention evaluation of the building. More over the weak zones of the structure due to analysis results are introduced and appropriate retrofit technique for satisfaction related life-safety and collapse-prevention criteria is presented. Actually in this project to improve the local behavior of coupling panels which are located regularly in main walls and definitely have been recognized as the most vulnerable structural elements, making use of steel plates which are connected to concrete members by chemical anchors has been used as the best retrofitting method for this case. Therefore in the final section of this paper it has been tried to explain the professional practical method utilized to perform the mentioned retrofitting project.

Epackachi, S.; Esmaili, O. [School of Civil Engineering, University of Tehran, Tehran (Iran, Islamic Republic of); Mirghaderi, S. R. [School of Civil Engineering, University of Tehran, Tehran (Iran, Islamic Republic of); The Committee for Revising the Iranian Code of Practice for Seismic Resistance Design of Buildings, Tehran (Iran, Islamic Republic of); Taheri, A. A. [The Committee for Revising the Iranian Code of Practice for Seismic Resistance Design of Buildings, Tehran (Iran, Islamic Republic of)

2008-07-08T23:59:59.000Z

125

A CORRELATION BETWEEN SURFACE DENSITIES OF YOUNG STELLAR OBJECTS AND GAS IN EIGHT NEARBY MOLECULAR CLOUDS  

SciTech Connect

We report the discovery and characterization of a power-law correlation between the local surface densities of Spitzer-identified, dusty young stellar objects (YSOs) and the column density of gas (as traced by near-IR extinction) in eight molecular clouds within 1 kpc and with 100 or more known YSOs. This correlation, which appears in data smoothed over size scales of {approx}1 pc, varies in quality from cloud to cloud; those clouds with tight correlations, MonR2 and Ophiuchus, are fit with power laws of slope 2.67 and 1.87, respectively. The spread in the correlation is attributed primarily to local gas disruption by stars that formed there or to the presence of very young subregions at the onset of star formation. We explore the ratio of the number of Class II to Class I sources, a proxy for the star formation age of a region, as a function of gas column density; this analysis reveals a declining Class II to Class I ratio with increasing column density. We show that the observed star-gas correlation is consistent with a star formation law where the star formation rate per area varies with the gas column density squared. We also propose a simple picture of thermal fragmentation of dense gas in an isothermal, self-gravitating layer as an explanation for the power law. Finally, we briefly compare the star-gas correlation and its implied star formation law with other recent proposed of star formation laws at similar and larger size scales from nearby star-forming regions.

Gutermuth, R. A. [Five College Astronomy Department, Smith College, Northampton, MA 01063 (United States); Pipher, J. L. [Department of Physics and Astronomy, University of Rochester, Rochester, NY (United States); Megeath, S. T.; Allen, T. S. [Department of Physics and Astronomy, University of Toledo, Toledo, OH (United States); Myers, P. C. [Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States); Allen, L. E. [National Optical Astronomy Observatories, Tucson, AZ (United States)

2011-10-01T23:59:59.000Z

126

A SUPER-EARTH ORBITING THE NEARBY SUN-LIKE STAR HD 1461  

Science Conference Proceedings (OSTI)

We present precision radial velocity (RV) data that reveal a Super-Earth mass planet and two probable additional planets orbiting the bright nearby G0V star HD 1461. Our 12.8 years of Keck High Resolution Echelle Spectrometer precision RVs indicate the presence of a 7.4 M{sub +} planet on a 5.77 day orbit. The data also suggest, but cannot yet confirm, the presence of outer planets on low-eccentricity orbits with periods of 446.1 and 5017 days, and projected masses (Msin i) of 27.9 and 87.1 M{sub +}, respectively. Test integrations of systems consistent with the RV data suggest that the configuration is dynamically stable. We present a 12.2 year time series of photometric observations of HD 1461, which comprise 799 individual measurements, and indicate that it has excellent long-term photometric stability. However, there are small amplitude variations with periods comparable to those of the suspected second and third signals in the RVs near 5000 and 446 days, thus casting some suspicion on those periodicities as Keplerian signals. If the 5.77 day companion has a Neptune-like composition, then its expected transit depth is of order dapprox0.5 mmag. The geometric a priori probability of transits is approx8%. Phase folding of the ground-based photometry shows no indication that transits of the 5.77 day companion are occurring, but high-precision follow-up of HD 1461 during upcoming transit phase windows will be required to definitively rule out or confirm transits. This new system joins a growing list of solar-type stars in the immediate galactic neighborhood that are accompanied by at least one Neptune (or lower) mass planets having orbital periods of 50 days or less.

Rivera, Eugenio J.; Vogt, Steven S.; Laughlin, Gregory; Meschiari, Stefano [UCO/Lick Observatory, University of California, Santa Cruz, CA 95064 (United States); Butler, R. Paul [Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road, NW, Washington, DC 20015-1305 (United States); Henry, Gregory W. [Center of Excellence in Information Systems, Tennessee State University, Nashville, TN 37209 (United States)

2010-01-10T23:59:59.000Z

127

Free-field ground motions for the nonproliferation experiment: Preliminary comparisons with nearby nuclear events  

SciTech Connect

Since 1987, we have installed fixed arrays of tri-axial accelerometers in the fire-field near the shot horizons for low-yield ({le} 20 kt) nuclear events in the N-tunnel complex beneath Rainier Mesa. For the Nonproliferation Experiment (NPE) we augmented the array to achieve 23 free-field stations. Goals are: (a) to examine robustness and stability of various free-field source function estimates -- e.g., reduced displacement potentials (RDP) and spectra; (b) to compare close-in with regional estimates to test whether detailed close-in free-field and/or surface ground motion data can improve predictability of regional-teleseismic source functions; (c) to provide experimental data for checking two-dimensional numerical simulations. We report preliminary comparisons between experimental free-field data for NPE (1993) and three nearby nuclear events (MISTY ECHO, 1988; MINERAL QUARRY, 1990; HUNTERS TROPHY, 1992). All four working points are within 1 km of each other in the same wet tuff bed, thus reducing concerns about possible large differences in material properties between widely separated shots. Initial comparison of acceleration and velocity seismograms for the four events reveals: (1) There is a large departure from the spherical symmetry commonly assumed in analytic treatments of source theory; both vertical and tangential components are surprisingly large. (2) All shots show similar first-peak particle-velocity amplitude decay rates suggesting significant attenuation even in the supposedly purely elastic region. (3) Sharp (>20 Hz) arrivals are not observed at tunnel level from near-surface pP reflections or spall-closure sources -- but broadened peaks are seen that suggest more diffuse reflected energy from the surface and from the Paleozoic limestone basement below tunnel level.

Olsen, K.H.; Peratt, A.L.

1994-06-01T23:59:59.000Z

128

Mid-Infrared Spectral Diagnostics of Nuclear and Extra-Nuclear Regions in Nearby Galaxies  

E-Print Network (OSTI)

Mid-infrared diagnostics are presented for a large portion of the Spitzer Infrared Nearby Galaxies Survey (SINGS) sample plus archival data from the Infrared Space Observatory and the Spitzer Space Telescope. Our main result is that these mid-infrared diagnostics effectively constrain a target's dominant power source. The combination of a high ionization line index and PAH strength serves as an efficient discriminant between AGN and star-forming nuclei, confirming progress made with ISO spectroscopy on starbursting and ultraluminous infrared galaxies. The sensitivity of Spitzer allows us to probe fainter nuclei and star-forming regions within galaxy disks. We find that both star-forming nuclei and extranuclear regions stand apart from nuclei that are powered by Seyfert or LINER activity. In fact, we identify areas within four diagnostic diagrams containing >90% Seyfert/LINER nuclei or >90% HII regions/HII nuclei. We also find that, compared to starbursting nuclei, extranuclear regions typically separate even further from AGN, especially for low-metallicity extranuclear environments. In addition, instead of the traditional mid-infrared approach to differentiating between AGN and star-forming sources that utilizes relatively weak high-ionization lines, we show that strong low-ionization cooling lines of X-ray dominated regions like [SiII] 34.82 micron can alternatively be used as excellent discrimants. Finally, the typical target in this sample shows relatively modest interstellar electron density (~400 cm^{-3}) and obscuration (A_V ~ 1.0 mag for a foreground screen), consistent with a lack of dense clumps of highly obscured gas and dust residing in the emitting regions. [Abridged

D. A. Dale; J. D. T. Smith; L. Armus; B. A. Buckalew; G. Helou; R. C. Kennicutt; J. Moustakas; H. Roussel; K. Sheth; G. J. Bendo; D. Calzetti; B. T. Draine; C. W. Engelbracht; K. D. Gordon; D. J. Hollenbach; T. H. Jarrett; L. J. Kewley; C. Leitherer; A. Li; S. Malhotra; E. J. Murphy; F. Walter

2006-04-01T23:59:59.000Z

129

A MOLECULAR STAR FORMATION LAW IN THE ATOMIC-GAS-DOMINATED REGIME IN NEARBY GALAXIES  

Science Conference Proceedings (OSTI)

We use the IRAM HERACLES survey to study CO emission from 33 nearby spiral galaxies down to very low intensities. Using 21 cm line atomic hydrogen (H I) data, mostly from THINGS, we predict the local mean CO velocity based on the mean H I velocity. By re-normalizing the CO velocity axis so that zero corresponds to the local mean H I velocity we are able to stack spectra coherently over large regions. This enables us to measure CO intensities with high significance as low as I{sub CO} {approx} 0.3 K km s{sup -1} ({Sigma}{sub H{sub 2}}{approx}1 M{sub sun} pc{sup -2}), an improvement of about one order of magnitude over previous studies. We detect CO out to galactocentric radii r{sub gal} {approx} r{sub 25} and find the CO radial profile to follow a remarkably uniform exponential decline with a scale length of {approx}0.2 r{sub 25}. Here we focus on stacking as a function of radius, comparing our sensitive CO profiles to matched profiles of H I, H{alpha}, far-UV (FUV), and Infrared (IR) emission at 24 {mu}m and 70 {mu}m. We observe a tight, roughly linear relationship between CO and IR intensity that does not show any notable break between regions that are dominated by molecular gas ({Sigma}{sub H{sub 2}}>{Sigma}{sub H{sub i}}) and those dominated by atomic gas ({Sigma}{sub H{sub 2}}gas with little dependence on the local total gas surface density. While galaxies display small internal variations in the SFR-to-H{sub 2} ratio, we do observe systematic galaxy-to-galaxy variations. These galaxy-to-galaxy variations dominate the scatter in relationships between CO and SFR tracers measured at large scales. The variations have the sense that less massive galaxies exhibit larger ratios of SFR-to-CO than massive galaxies. Unlike the SFR-to-CO ratio, the balance between atomic and molecular gas depends strongly on the total gas surface density and galactocentric radius. It must also depend on additional parameters. Our results reinforce and extend to lower surface densities, a picture in which star formation in galaxies can be separated into two processes: the assembly of star-forming molecular clouds and the formation of stars from H{sub 2}. The interplay between these processes yields a total gas-SFR relation with a changing slope, which has previously been observed and identified as a star formation threshold.

Schruba, Andreas; Walter, Fabian; Dumas, Gaelle; Sandstrom, Karin [Max-Planck-Institut fuer Astronomie, Koenigstuhl 17, 69117 Heidelberg (Germany); Leroy, Adam K. [National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903 (United States); Bigiel, Frank [Department of Astronomy, Radio Astronomy Laboratory, University of California, Berkeley, Berkeley, CA 94720 (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); Kramer, Carsten [IRAM, Avenida Divina Pastora 7, 18012 Granada (Spain); Rosolowsky, Erik [Department of Physics and Astronomy, University of British Columbia Okanagan, 3333 University Way, Kelowna, BC V1V 1V7 (Canada); Schuster, Karl [IRAM, 300 rue de la Piscine, 38406 St. Martin d'Heres (France); Usero, Antonio [Observatorio Astronomico Nacional, C/Alfonso XII, 3, 28014, Madrid (Spain); Weiss, Axel; Wiesemeyer, Helmut, E-mail: schruba@mpia.de [MPIfR, Auf dem Huegel 69, 53121 Bonn (Germany)

2011-08-15T23:59:59.000Z

130

Lateral Dispersion from Tall Stacks  

Science Conference Proceedings (OSTI)

Hourly ground-level concentrations of SF6 at downwind distances ranging from 0.5 to 50 km were observed by the Electric Power Research Institute (EPRI) on dense monitoring networks around power plants at Kincaid, Illinois, and Bull Run, ...

Steven R. Hanna

1986-10-01T23:59:59.000Z

131

All-Star Skills Competition Rules -2013 Participant first shoots a layup. After dribbling between three obstacles, the player must throw a pass into a first net (or  

E-Print Network (OSTI)

All-Star Skills Competition Rules - 2013 Participant first shoots a layup. After dribbling between between a second set of three obstacles and complete the challenge with a layup or shot. Touching course with a basketball in their hand. When the ref signals, the player will start with a layup

Tipple, Brett

132

Green's Function Retrieval from the CCF of Random Waves and Energy Conservation for an Obstacle of Arbitrary Shape: Noise Source Distribution on the Surr Green's Function Retrieval from the CCF of Random Waves  

E-Print Network (OSTI)

Waves and Energy Conservation for an Obstacle of Arbitrary Shape: Noise Source DistributionGreen's Function Retrieval from the CCF of Random Waves and Energy Conservation for an Obstacle of Arbitrary Shape: Noise Source Distribution on the Surr Green's Function Retrieval from the CCF of Random

133

Cool Customers in the Stellar Graveyard III: Limits to Substellar Objects around nearby White Dwarfs using CFHT  

E-Print Network (OSTI)

Results from a groundbased high contrast imaging survey of thirteen nearby white dwarfs for substellar objects is presented. We place strict upper limits on the type of substellar objects present, ruling out the presence of anything larger than $\\sim$14 M$_{Jup}$ for eight of the white dwarfs at separations $>$19 AU and corresponding to primordial separations of $\\sim$3-6~AU assuming adiabatic mass loss without tidal interactions. With these results we place the first upper limit on the number of intermediate mass stars with brown dwarfs at separations $>$ 13 AU. We combine these results with previous work to place upper limits on the number of massive Jovian ($>$ 10 M$_{Jup}$) planets in orbit around white dwarfs whose progenitors spanned a mass range of 1-7 M$_{\\odot}$.

J. H. Debes; J. Ge; C. Ftaclas

2005-09-28T23:59:59.000Z

134

Circumnuclear Dust in Nearby Active and Inactive Galaxies. II. Bars, Nuclear Spirals, and the Fueling of Active Galactic Nuclei  

E-Print Network (OSTI)

(Abridged) We present a detailed study of the relation between circumnuclear dust morphology, host galaxy properties, and nuclear activity in nearby galaxies. We use our sample of 123 nearby galaxies with visible--near-infrared colormaps from the Hubble Space Telescope to create well-matched, "paired" samples of 28 active and 28 inactive galaxies, as well as 19 barred and 19 unbarred galaxies, that have the same host galaxy properties. Comparison of the barred and unbarred galaxies shows that grand design nuclear dust spirals are only found in galaxies with a large-scale bar. Tightly wound nuclear dust spirals, in contrast, show a strong tendency to avoid galaxies with large-scale bars. Comparison of the AGN and inactive samples shows that nuclear dust spirals, which may trace shocks and angular momentum dissipation in the ISM, occur with comparable frequency in both active and inactive galaxies. The only difference between the active and inactive galaxies is that several inactive galaxies appear to completely lack dust structure in their circumnuclear region, while none of the AGN lack this structure. The comparable frequency of nuclear spirals in active and inactive galaxies, combined with previous work that finds no significant differences in the frequency of bars or interactions between well-matched active and inactive galaxies, suggests that no universal fueling mechanism for low-luminosity AGN operates at spatial scales greater than ~100 pc radius from the galactic nuclei. The similarities instead suggest that the lifetime of nuclear activity is less than the characteristic inflow time from these spatial scales. An order-of-magnitude estimate of this inflow time is the dynamical timescale. This sets an upper limit of several million years to the lifetime of an individual episode of nuclear activity.

Paul Martini; Michael W. Regan; John S. Mulchaey; Richard W. Pogge

2002-12-17T23:59:59.000Z

135

Multiple protostellar systems. II. A high resolution near-infrared imaging survey in nearby star-forming regions  

E-Print Network (OSTI)

(abridged) Our project endeavors to obtain a robust view of multiplicity among embedded Class I and Flat Spectrum protostars in a wide array of nearby molecular clouds to disentangle ``universal'' from cloud-dependent processes. We have used near-infrared adaptive optics observations at the VLT through the H, Ks and L' filters to search for tight companions to 45 Class I and Flat Spectrum protostars located in 4 different molecular clouds (Taurus-Auriga, Ophiuchus, Serpens and L1641 in Orion). We complemented these observations with published high-resolution surveys of 13 additional objects in Taurus and Ophiuchus. We found multiplicity rates of 32+/-6% and 47+/-8% over the 45-1400 AU and 14-1400 AU separation ranges, respectively. These rates are in excellent agreement with those previously found among T Tauri stars in Taurus and Ophiuchus, and represent an excess of a factor ~1.7 over the multiplicity rate of solar-type field stars. We found no non-hierarchical triple systems, nor any quadruple or higher-or...

Duchęne, G; Bouvier, J; André, P; Djupvik, A A; Ghez, A M

2007-01-01T23:59:59.000Z

136

Large-scale HI in nearby radio galaxies (II): the nature of classical low-power radio sources  

E-Print Network (OSTI)

An important aspect of solving the long-standing question as to what triggers various types of Active Galactic Nuclei involves a thorough understanding of the overall properties and formation history of their host galaxies. This is the second in a series of papers that systematically study the large-scale properties of cold neutral hydrogen (HI) gas in nearby radio galaxies. The main goal is to investigate the importance of gas-rich galaxy mergers and interactions among radio-loud AGN. In this paper we present results of a complete sample of classical low-power radio galaxies. We find that extended Fanaroff & Riley type-I radio sources are generally not associated with gas-rich galaxy mergers or ongoing violent interactions, but occur in early-type galaxies without large (> 10^8 M_sun) amounts of extended neutral hydrogen gas. In contrast, enormous discs/rings of HI gas (with sizes up to 190 kpc and masses up to 2 x 10^10 M_sun) are detected around the host galaxies of a significant fraction of the compac...

Emonts, B H C; Struve, C; Oosterloo, T A; van Moorsel, G; Tadhunter, C N; van der Hulst, J M; Brogt, E; Holt, J; Mirabal, N

2010-01-01T23:59:59.000Z

137

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

SciTech Connect

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

138

CHANDRA ACIS SURVEY OF X-RAY POINT SOURCES IN 383 NEARBY GALAXIES. I. THE SOURCE CATALOG  

SciTech Connect

The Chandra data archive is a treasure for various studies, and in this paper we exploit this valuable resource to study the X-ray point source populations in nearby galaxies. By 2007 December 14, 383 galaxies within 40 Mpc with isophotal major axis above 1 arcmin had been observed by 626 public ACIS observations, most of which were for the first time analyzed by this survey to study the X-ray point sources. Uniform data analysis procedures are applied to the 626 ACIS observations and lead to the detection of 28,099 point sources, which belong to 17,599 independent sources. These include 8700 sources observed twice or more and 1000 sources observed 10 times or more, providing us a wealth of data to study the long-term variability of these X-ray sources. Cross-correlation of these sources with galaxy isophotes led to 8519 sources within the D{sub 25} isophotes of 351 galaxies, 3305 sources between the D{sub 25} and 2D{sub 25} isophotes of 309 galaxies, and additionally 5735 sources outside 2D{sub 25} isophotes of galaxies. This survey has produced a uniform catalog, by far the largest, of 11,824 X-ray point sources within 2D{sub 25} isophotes of 380 galaxies. Contamination analysis using the log N-log S relation shows that 74% of sources within 2D{sub 25} isophotes above 10{sup 39} erg s{sup -1}, 71% of sources above 10{sup 38} erg s{sup -1}, 63% of sources above 10{sup 37} erg s{sup -1}, and 56% of all sources are truly associated with galaxies. Meticulous efforts have identified 234 X-ray sources with galactic nuclei of nearby galaxies. This archival survey leads to 300 ultraluminous X-ray sources (ULXs) with L{sub X} (0.3-8 keV) {>=} 2 x 10{sup 39} erg s{sup -1}within D{sub 25} isophotes, 179 ULXs between D{sub 25} and 2D{sub 25} isophotes, and a total of 479 ULXs within 188 host galaxies, with about 324 ULXs truly associated with host galaxies based on the contamination analysis. About 4% of the sources exhibited at least one supersoft phase, and 70 sources are classified as ultraluminous supersoft sources with L{sub X} (0.3-8 keV) {>=} 2 x 10{sup 38} erg s{sup -1}. With a uniform data set and good statistics, this survey enables future works on various topics, such as X-ray luminosity functions for the ordinary X-ray binary populations in different types of galaxies, and X-ray properties of galactic nuclei.

Liu Jifeng [National Astronomical Observatories of China, 20 Datun Rd, Chaoyang, Beijing 100012 (China); Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138 (United States)

2011-01-15T23:59:59.000Z

139

Multiple protostellar systems. II. A high resolution near-infrared imaging survey in nearby star-forming regions  

E-Print Network (OSTI)

(abridged) Our project endeavors to obtain a robust view of multiplicity among embedded Class I and Flat Spectrum protostars in a wide array of nearby molecular clouds to disentangle ``universal'' from cloud-dependent processes. We have used near-infrared adaptive optics observations at the VLT through the H, Ks and L' filters to search for tight companions to 45 Class I and Flat Spectrum protostars located in 4 different molecular clouds (Taurus-Auriga, Ophiuchus, Serpens and L1641 in Orion). We complemented these observations with published high-resolution surveys of 13 additional objects in Taurus and Ophiuchus. We found multiplicity rates of 32+/-6% and 47+/-8% over the 45-1400 AU and 14-1400 AU separation ranges, respectively. These rates are in excellent agreement with those previously found among T Tauri stars in Taurus and Ophiuchus, and represent an excess of a factor ~1.7 over the multiplicity rate of solar-type field stars. We found no non-hierarchical triple systems, nor any quadruple or higher-order systems. No significant cloud-to-cloud difference has been found, except for the fact that all companions to low-mass Orion protostars are found within 100 AU of their primaries whereas companions found in other clouds span the whole range probed here. Based on this survey, we conclude that core fragmentation always yields a high initial multiplicity rate, even in giant molecular clouds such as the Orion cloud or in clustered stellar populations as in Serpens, in contrast with predictions of numerical simulations. The lower multiplicity rate observed in clustered Class II and Class III populations can be accounted for by a universal set of properties for young systems and subsequent ejections through close encounters with unrelated cluster members.

G. Duchęne; S. Bontemps; J. Bouvier; P. André; A. A. Djupvik; A. M. Ghez

2007-10-03T23:59:59.000Z

140

A dichotomy in the orientation of dust and radio jets in nearby low-power radio galaxies  

E-Print Network (OSTI)

We examine the properties of central dust in nearby quiescent and active early-type galaxies. The active galaxies are low-power radio galaxies with Fanaroff & Riley Type I or I/II radio jets. We focus on the comparison of the dust distributions in the active and quiescent galaxy samples and the relation between the radio jet and dust orientations. Our main observational conclusions are: (a) radio galaxies contain a higher fraction of regular dust 'ellipses' compared to quiescent galaxies which contain more often irregular dust distributions; (b) the morphology, size and orientation of dust ellipses and lanes in quiescent early-types and active early-types with kpc-scale radio jets is very similar; (c) dust ellipses are aligned with the major axis of the galaxy, dust lanes do not show a preferred alignment except for large (>kpc) dust lanes which are aligned with the minor axis of the galaxy. Dust morphologies can be classified as regular 'ellipses' and filamentary 'lanes'. We show that the dust ellipses are consistent with being nearly circular thin disks viewed at random viewing angles. The lanes are likely warped dust structures, which may be in the process of settling down to become regular disks or are being perturbed by a non-gravitational force. We use the observed dust-jet orientations to constrain the three-dimensional angle $\\theta_{\\rm DJ}$ between jet and dust. For dust-lane galaxies, the jet is approximately perpendicular to the dust structure, while for dust-ellipse galaxies there is a much wider distribution of $\\theta_{\\rm DJ}$. We discuss two scenarios that could explain the dust/jet/galaxy orientation dichotomy. (abridged)

Gijs Verdoes Kleijn; Tim de Zeeuw

2005-02-03T23:59:59.000Z

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


141

Preliminary analysis of legal obstacles and incentives to the development of low-head hydroelectric power in the northeastern United States  

DOE Green Energy (OSTI)

A preliminary analysis of the legal obstacles and incentives to the development of the low-head hydroelectric potential of the 19 northeastern US (Maine, New Hampshire, Vermont, Massachusetts, Rhode Island, Connecticut, New York, New Jersey, Pennsylvania, Ohio, Indiana, Michigan, Illinois, Wisconsin, Kentucky, Maryland, Delaware, Virginia, and West Virginia) is presented. The statutes and case laws of the 19 states and the Federal government which affect developers of small dams are stressed. The legal uncertainty which confronts the developer of small dams and the regulatory burden to which the developer may be subjected once the uncertainty is resolved are emphasized.

Not Available

1980-05-01T23:59:59.000Z

142

CONTINUUM HALOS IN NEARBY GALAXIES: AN EVLA SURVEY (CHANG-ES). II. FIRST RESULTS ON NGC 4631  

Science Conference Proceedings (OSTI)

We present the first results from the Continuum Halos in Nearby Galaxies-an EVLA Survey (CHANG-ES), a new survey of 35 edge-on galaxies to search for both in-disk and extraplanar radio continuum emission. CHANG-ES is exploiting the new wide-band, multi-channel capabilities of the Karl G. Jansky Very Large Array (i.e., the Expanded Very Large Array or EVLA) with observations in two bands centered at 1.5 and 6 GHz in a variety of array configurations with full polarization. The motivation and science case for the survey are presented in a companion paper (Paper I). These first results are based on C-array test observations in both observing bands of the well-known radio halo galaxy, NGC 4631. In this paper, we outline the observations and the data reduction steps that are required for wide-band calibration and mapping of EVLA data, including polarization. With modest on-source observing times (30 minutes at 1.5 GHz and 75 minutes at 6 GHz for the test data), we have achieved best rms noise levels of 22 and 3.5 {mu}Jy beam{sup -1} at 1.5 GHz and 6 GHz, respectively. New disk-halo features have been detected, among them two at 1.5 GHz that appear as loops in projection. We present the first 1.5 GHz spectral index map of NGC 4631 to be formed from a single wide-band observation in a single array configuration. This map represents tangent slopes to the intensities within the band centered at 1.5 GHz, rather than fits across widely separated frequencies as has been done in the past and is also the highest spatial resolution spectral index map yet presented for this galaxy. The average spectral index in the disk is {alpha}-bar{sub 1.5GHz} = -0.84 {+-} 0.05 indicating that the emission is largely non-thermal, but a small global thermal contribution is sufficient to explain a positive curvature term in the spectral index over the band. Two specific star-forming regions have spectral indices that are consistent with thermal emission. Polarization results (uncorrected for internal Faraday rotation) are consistent with previous observations and also reveal some new features. On broad scales, we find strong support for the notion that magnetic fields constrain the X-ray-emitting hot gas.

Irwin, Judith; Henriksen, Richard N. [Department of Physics, Engineering Physics and Astronomy, Queen's University, Kingston, ON K7L 3N6 (Canada); Beck, Rainer; Krause, Marita; Mora, Silvia Carolina; Schmidt, Philip [Max-Planck-Institut fuer Radioastronomie, Auf dem Huegel 69, 53121, Bonn (Germany); Benjamin, R. A. [Department of Physics, University of Wisconsin at Whitewater, 800 West Main St., Whitewater, WI 53190 (United States); Dettmar, Ralf-Juergen; Miskolczi, Arpad [Astronomisches Institut, Ruhr-Universitaet Bochum, 44780 Bochum (Germany); English, Jayanne [Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2 (Canada); Heald, George; Oosterloo, Tom [Netherlands Institute for Radio Astronomy (ASTRON), Postbus 2, 7990 AA, Dwingeloo (Netherlands); Johnson, Megan [National Radio Astronomy Observatory, P.O. Box 2, Greenbank, WV 24944 (United States); Li, Jiang-Tao [Department of Astronomy, University of Massachusetts, 710 North Pleasant St., Amherst, MA 01003 (United States); Murphy, E. J. [Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101 (United States); Porter, Troy A. [Hansen Experimental Physics Laboratory, Stanford University, 452 Lomita Mall, Stanford, CA 94305 (United States); Rand, Richard J. [Department of Physics and Astronomy, University of New Mexico, 800 Yale Boulevard, NE, Albuquerque, NM 87131 (United States); Saikia, D. J. [National Centre for Radio Astrophysics, TIFR, Pune University Campus, Post Bag 3, Pune 411 007 (India); Strong, A. W. [Max-Planck-Institut fuer extraterrestrische Physik, Garching bei Muenchen (Germany); Walterbos, Rene, E-mail: irwin@astro.queensu.ca, E-mail: henriksn@astro.queensu.ca, E-mail: twiegert@astro.queensu.ca, E-mail: rbeck@mpifr-bonn.mpg.de, E-mail: mkrause@mpifr-bonn.mpg.de, E-mail: cmora@mpifr-bonn.mpg.de [Department of Astronomy, New Mexico State University, P.O. Box 30001, MSC 4500, Las Cruces, NM 88003 (United States); and others

2012-08-15T23:59:59.000Z

143

Enjoy the trails through the tall  

E-Print Network (OSTI)

wings. You might catch a glimpse of red squirrels or even a capercaillie or black grouse ­ so please of farming. Look quietly for red squirrels and hunt for tadpoles in the burns. Listen for the call of cuckoos-bordered fritillary Red squirrel Fowk (people) fae roon aboot haev dargit (worked) athoot peyment tae mend the aald

144

Comments on “Lateral Dispersion from Tall Stacks”  

Science Conference Proceedings (OSTI)

A few minor errors in a paper by Hanna are noted and several questions are raised about apparent inconsistencies. One question is why substantial enhancement of ?y, by buoyancy was noted for the Bull Run data but was unmentioned for the Kincaid ...

Gary A. Briggs

1987-12-01T23:59:59.000Z

145

The Bioclimatic Design of Tall Buildings  

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

Seminar HostPoint of Contact: Pat Ross Ken Yeang is an inventive and prolific architect working in the rapidly developing economy of south-east Asia. Underlying the...

146

A web-tool for population synthesis of near-by cooling neutron stars: An on-line test for cooling curves  

E-Print Network (OSTI)

We present a new web-tool - Net-PSICoNS - for population synthesis of isolated near-by cooling neutron stars (NSs). The main aim is to provide an easy test of models of the NS thermal evolution which can be used by groups studying this subject. A user can upload cooling curves for a set of masses, modify the mass spectrum if necessary, change radii to fit the EoS used for cooling curve calculations, and then a population synthesis of close-by isolated cooling NSs is performed. The output includes the Log N -- Log S distribution confronted with the ROSAT observations and several other sets of data. In this paper, we summarize the idea of the test proposed by Popov et al. (2006), and present a user's manual for the web-tool.

Boldin, P A; Tetzlaff, N

2010-01-01T23:59:59.000Z

147

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)

As Extension begins to develop educational program delivery strategies for Emergency Preparedness and Management education, the major challenge will be to establish a culture among county agriculture and natural resources (ANR) Extension agents to integrate this educational programming into ongoing programming to ensure added value to this innovation and its unit of adoption. The attitudes and perceptions of these ANR agents in overall programming efforts will be extremely important for adoption and further dissemination of Emergency Preparedness and Management education to all clientele; therefore, the purpose of this study was to determine what Extension ANR agents perceived as advantages and obstacles associated with the organization and implementation of Emergency Preparedness and Management education and the necessity for establishing local animal issues committees. The study population was Texas AgriLife Extension Service ANR agents. The agents were from both rural and urban counties, in various stages in their careers and various stages of the organization, facilitation and implementation of Emergency Preparedness and Management education and animal issues committee establishment. An online instrument was developed based on a review of related literature. The instrument had 19 total question sets pertaining to the 4 objectives of the study and included matrix, multiple choice and yes/no questions. Questions to obtain demographic information (gender, age, Extension affiliation, years of employment with Extension, and county size) were also asked. Results indicated ANR agents felt Extension should be involved in the organization, planning and implementation of educational efforts in Emergency Preparedness and Management and also the establishment and maintenance of Animal Issues Committees. ANR agents indicated Extension?s best approach would be to help identify innovators, adopters and the resources needed for Emergency Preparedness and Management and Animal Issues Committees. The success or failure of educational programming for Emergency Management depends on the help or assistance that is provided by the key stakeholders and agencies in counties. From this study, it is apparent local stakeholder and agency involvement has been an advantage and obstacle for Texas AgriLife Extension ANR agents in the state of Texas.

Maxwell, Ricky G.

2010-05-01T23:59:59.000Z

148

System for measuring the coordinates of tire surfaces in transient conditions when rolling over obstacles: Description of the system and performance analysis  

Science Conference Proceedings (OSTI)

This paper describes the development of a system for measuring surface coordinates (commonly known as ''shape measurements'') which is able to give the temporal evolution of the position of the tire sidewall in transient conditions (such as during braking, when there are potholes or when the road surface is uneven) which may or may not be reproducible. The system is based on the well-known technique of projecting and observing structured light using a digital camera with an optical axis which is slanted with respect to the axis of the projector. The transient nature of the phenomenon has led to the development of specific innovative solutions as regards image processing algorithms. This paper briefly describes the components which make up the measuring system and presents the results of the measurements carried out on the drum bench. It then analyses the performance of the measuring system and the sources of uncertainty which led to the development of the system for a specific dynamic application: impact with an obstacle (cleat test). The measuring system guaranteed a measurement uncertainty of 0.28 mm along the Z axis (the axial direction of the tire) with a measurement range of 250(X)x80(Y)x25(Z) mm{sup 3}, with the tire rolling at a speed of up to 30 km/h.

Castellini, Paolo; Di Giuseppe, Andrea [Dipartimento di Meccanica, Universita Politecnica delle Marche, Via Brecce Bianche, 60131 Ancona (Italy)

2008-06-15T23:59:59.000Z

149

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

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

150

INTRODUCTION OVERCOMING OBSTACLES TO ENERGY  

E-Print Network (OSTI)

.S.ENERGYCONSUMPTION (BTUX1015)** BYCONTRIBUTION Consumption Coal% Petroleum% NaturalGas% OilShale% Hydro&Geothermal% Nuclear

Columbia University

151

Pipeline response to nearby detonations  

SciTech Connect

Texas Gas Transmission Corp. has supplemented the findings of Southwest Research Institute's study of detonation-induced stresses on pipelines by applying SwRI's equations to actual field problems. Texas Gas used the blasting-stress equations to fix the minimum allowable stand-off distance and maximum particle velocities for strip-mining operations planned along a transmission line right-of-way. The ultimate goal was to ensure that the combined stresses of blasting and operating pressures would not exceed 72% of the pipe's specified minimum yield strength. These stress calculations enabled Texas Gas to maintain normal operating conditions throughout the time that overburden blasting was taking place 100-500 ft from the line.

Bart, G.J.

1979-01-01T23:59:59.000Z

152

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

153

THE SOLAR NEIGHBORHOOD. XXVIII. THE MULTIPLICITY FRACTION OF NEARBY STARS FROM 5 TO 70 AU AND THE BROWN DWARF DESERT AROUND M DWARFS  

Science Conference Proceedings (OSTI)

We report on our analysis of Hubble Space Telescope/NICMOS snapshot high-resolution images of 255 stars in 201 systems within {approx}10 pc of the Sun. Photometry was obtained through filters F110W, F180M, F207M, and F222M using NICMOS Camera 2. These filters were selected to permit clear identification of cool brown dwarfs through methane contrast imaging. With a plate scale of 76 mas pixel{sup -1}, NICMOS can easily resolve binaries with subarcsecond separations in the 19.''5 Multiplication-Sign 19.''5 field of view. We previously reported five companions to nearby M and L dwarfs from this search. No new companions were discovered during the second phase of data analysis presented here, confirming that stellar/substellar binaries are rare. We establish magnitude and separation limits for which companions can be ruled out for each star in the sample, and then perform a comprehensive sensitivity and completeness analysis for the subsample of 138 M dwarfs in 126 systems. We calculate a multiplicity fraction of 0.0{sup +3.5}{sub -0.0}% for L companions to M dwarfs in the separation range of 5-70 AU, and 2.3{sup +5.0}{sub -0.7}% for L and T companions to M dwarfs in the separation range of 10-70 AU. We also discuss trends in the color-magnitude diagrams using various color combinations and present astrometry for 19 multiple systems in our sample. Considering these results and results from several other studies, we argue that the so-called brown dwarf desert extends to binary systems with low-mass primaries and is largely independent of primary mass, mass ratio, and separations. While focusing on companion properties, we discuss how the qualitative agreement between observed companion mass functions and initial mass functions suggests that the paucity of brown dwarfs in either population may be due to a common cause and not due to binary formation mechanisms.

Dieterich, Sergio B.; Henry, Todd J. [Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30302-4106 (United States); Golimowski, David A. [Space Telescope Science Institute, Baltimore, MD 21218 (United States); Krist, John E. [Jet Propulsion Laboratory, Pasadena, CA 91109 (United States); Tanner, Angelle M., E-mail: dieterich@chara.gsu.edu [Department of Physics and Astronomy, Mississippi State University, Starkville, MS 39762 (United States)

2012-08-15T23:59:59.000Z

154

Microsoft Word - Appendix Cover Sheets  

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

when cast on nearby residences ("receptors"). The spatial relationship between a wind turbine and a receptor, the location of trees, buildings, and other obstacles, and weather...

155

Can CO2 Turbulent Flux Be Measured by Lidar? A Preliminary Study  

Science Conference Proceedings (OSTI)

The vertical profiling of CO2 turbulent fluxes in the atmospheric boundary layer (ABL) is investigated using a coherent differential absorption lidar (CDIAL) operated nearby a tall tower in Wisconsin during June 2007. A CDIAL can perform ...

Fabien Gibert; Grady J. Koch; Jeffrey Y. Beyon; Timothy W. Hilton; Kenneth J. Davis; Arlyn Andrews; Pierre H. Flamant; Upendra N. Singh

2011-03-01T23:59:59.000Z

156

seeds grow into tall plants. My - Energy Information Administration  

U.S. Energy Information Administration (EIA)

into water vapor. I had evaporated! I rose high into the sky. Many of my friends came with me. They had evaporated, too. Together, we formed a cloud.

157

A Tall Order: Climate Models Fall Short in Predicting African  

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

during a 1-year deployment in Niamey in 2006, as a contribution to the African Monsoon Multidisciplinary Analysis. "The availability of these datasets, as well as the...

158

TALL : rethinking the systems of the contemporary high rise  

E-Print Network (OSTI)

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

Namkung, Kenneth, 1977-

2003-01-01T23:59:59.000Z

159

Water use of tall and dwarf crop plants  

E-Print Network (OSTI)

height in a spring wheat. Crop Science 34(No. 6); \\ i i *O F T A L L AND D W A R F CROP PLANTS By J . Giles Wainesbetween water application, crop yields, and management

Waines, J. Giles; Ehdaie, Bahman

1994-01-01T23:59:59.000Z

160

THE STEEL TOWER: A 21st CENTURY TALL BUILDING.  

E-Print Network (OSTI)

?? This paper outlines the need for a new mixed use high-rise project for the commercial business district of Pittsburgh, Pennsylvania. The proposed tower combines… (more)

Duke, Peter Guldenshuh

2013-01-01T23:59:59.000Z

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.


161

A tall tower wind investigation of northwest Missouri .  

E-Print Network (OSTI)

??With energy needs on the rise and our current energy consumption methods polluting the atmosphere, it is the right time to look at alternative forms… (more)

Redburn, Rachel

2007-01-01T23:59:59.000Z

162

The Association of Tall Eyewall Convection with Tropical Cyclone Intensification .  

E-Print Network (OSTI)

??Despite decades of research, operational weather agencies still find it difficult to predict change in the intensity of a tropical cyclone's surface wind. This dissertation… (more)

Kelley, Owen A.

2008-01-01T23:59:59.000Z

163

A New Tall-Tower Meteorological Monitoring System  

SciTech Connect

The Atmospheric Technologies Group of the Savannah River Technology Center operates an extensive meteorological monitoring network of 13 tower in and near the Savannah River Site near Aiken, South Carolina. The data from this system are available in ''real-time'' for emergency response atmospheric release modeling and operational weather forecasting.

Parker, M.J.

2003-01-14T23:59:59.000Z

164

Electromagnetic radiation from lightning return strokes to tall structures.  

E-Print Network (OSTI)

??The study of the interaction of lightning electromagnetic fields with electrical systems and the design of appropriate protection strategies are generally based on statistical distributions… (more)

Pavanello, Davide

2007-01-01T23:59:59.000Z

165

Tall Dhiban 2004 Pilot Season: Prospection, Preservation, and Planning  

E-Print Network (OSTI)

8. 12) wheel-manufactured jars and cooking pots (Fig. 8.hand-manufactured geometrically painted jars (Fig. 8.4, 14, 17). Sugar jars (Fig. 8. 10), indicative of the

Porter, Benjamin W.; Routledge, Bruce; Steen, Danielle; Parlsow, Carla; de Jong, Lidewijde; Zimmerle, William

2005-01-01T23:59:59.000Z

166

WTC Report Urges Action for Safer Tall Buildings  

Science Conference Proceedings (OSTI)

... by each of the 30 recommendations in the final WTC towers report; ... 26 are contained within 43 separate reports (totaling some 10,000 pages ...

2012-12-13T23:59:59.000Z

167

CHP in NYC: Obstacles and Opportunities  

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

goal a challenge. Dr. Hammer will also discuss other work taking place at his center related to microgrids, demand response, and buildings-related energy efficiency initiatives...

168

Fuzzy truck control scheme for obstacle avoidance  

Science Conference Proceedings (OSTI)

for many years in the hope of achieving human-like performance. One of these ..... sured and compared perhaps using mean-square error criteria. Intuitively ...

169

Obstacles in Hawaii Laws to Implementation of  

E-Print Network (OSTI)

of a hard cooked egg as a garnish easily meets this protein requirement. Each meal should furnish about one garnishes. ' ~ Here are a few simple garnishes which may be added. , ~ Hard cooked eggs . halved, quartered garnish. Serve blueberries and raspberries whole. · Dark sweet cherries with stems on, tiny bunches

170

Planning and obstacle avoidance in mobile robotics  

Science Conference Proceedings (OSTI)

The paper focuses on the navigation subsystem of a mobile robot which operates in human environments to carry out different tasks, such as transporting waste in hospitals or escorting people in exhibitions. The paper describes a hybrid approach (Roaming ... Keywords: Autonomous navigation, Hybrid architectures, Mobile robots, Planning, Reactive and local methods

Antonio Sgorbissa; Renato Zaccaria

2012-04-01T23:59:59.000Z

171

Obstacles to High-Dimensional Particle Filtering  

Science Conference Proceedings (OSTI)

Particle filters are ensemble-based assimilation schemes that, unlike the ensemble Kalman filter, employ a fully nonlinear and non-Gaussian analysis step to compute the probability distribution function (pdf) of a system’s state conditioned on a ...

Chris Snyder; Thomas Bengtsson; Peter Bickel; Jeff Anderson

2008-12-01T23:59:59.000Z

172

Mobile Autonomous Vehicle Obstacle Detection and ...  

Science Conference Proceedings (OSTI)

... vehicles from different manufacturers and to ... for Automated Guided Vehicle Safety Standards ... Control of Manufacturing Vehicles Research Towards ...

2013-01-11T23:59:59.000Z

173

Lithium Depletion of Nearby Young Stellar Associations  

E-Print Network (OSTI)

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

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

2008-08-26T23:59:59.000Z

174

Molecular gas in nearby elliptical radio galaxies  

E-Print Network (OSTI)

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

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

2008-03-31T23:59:59.000Z

175

Molecular gas in nearby elliptical radio galaxies  

E-Print Network (OSTI)

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

Ocana-Flaquer, B; Lim, J; Combes, F; Dinh-V-Trung,

2008-01-01T23:59:59.000Z

176

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

E-Print Network (OSTI)

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

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

2008-10-02T23:59:59.000Z

177

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

E-Print Network (OSTI)

Science in Engineering Sciences (Electrical Engineering) byin Engineering Sciences (Electrical Engineering) University

Larson, Jacoby

2011-01-01T23:59:59.000Z

178

Long range hopping mobility platform.  

SciTech Connect

Sandia National Laboratories has developed a mesoscale hopping mobility platform (Hopper) to overcome the longstanding problems of mobility and power in small scale unmanned vehicles. The system provides mobility in situations such as negotiating tall obstacles and rough terrain that are prohibitive for other small ground base vehicles. The Defense Advanced Research Projects Administration (DARPA) provided the funding for the hopper project.

Spletzer, Barry Louis; Fischer, Gary John

2003-03-01T23:59:59.000Z

179

Geothermal energy: obstacles and uncertainties impede its widespread use  

DOE Green Energy (OSTI)

A perspective on geothermal energy's development and potential and a discussion of Federal actions needed to help accelerate geothermal development and use are included. (MHR)

Staats E.B.

1980-01-18T23:59:59.000Z

180

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

E-Print Network (OSTI)

Combined heat and power (CHP), which can offer tremendous efficiency benefits to industrial facilities around the country, continues to be viewed as a long-term efficiency opportunity. However, the high up-front cost of CHP equipment and fuel-dependent operating costs have made CHP a difficult sell internally in some corporations. The recent recession and slow recovery have further discouraged facility managers and owners from making large capital investments such as CHP. This paper addresses the biggest barriers to new CHP project development from the perspective of those intimately involved in moving new CHP projects forward: CHP developers and CHP advocates. It identifies economic and financial barriers as the largest common barriers found throughout the U.S. It also suggests ways that CHP developers and advocates can address these barriers, and attempts to overcome them in the current economic context.

Chittum, A.; Kaufman, N.

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.


181

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

182

Dislocation Glide through Non-randomly Distributed Point Obstacles  

Science Conference Proceedings (OSTI)

Presentation Title, Dislocation Glide through Non-randomly Distributed Point ... Changing the Paradigm for Engineering Design by Merging High Energy X-ray ...

183

Obstacles and Opportunity: Turbine Motorization in Refineries Today  

E-Print Network (OSTI)

Steam turbines have been widely used in oil refineries for driving pumps, compressors and other rotary machines. However, in recent years, the authors of this paper have seen substantial turbine motorization projects completed or being planned in the refineries. This paper discusses the key aspects that should be considered in evaluating the feasibility of motorization projects. Based on the literature review and a refinery survey conducted by the authors, the key factors include the critical level of the related equipment, the potential energy savings and capital cost, the steam and power balance in the related area, and the reliability in the refinery's power supply. Based on the authors' experience, the utilities' energy efficiency incentive programs in California also influence the decision-making process for turbine motorization projects. Therefore, this paper includes a description of the utilities' guidelines for fuel substitution projects. In particular, the utilities' three-prong requirements on net source-BTU energy savings, cost effectiveness, and avoidance of adverse impacts to the environment are discussed. Two real life case studies are presented to demonstrate how the above criteria should be applied for determining if a motorization opportunity is economically viable. A discussion on suggested features is also included for prescreening turbine motorization project candidates for better energy and environment economics such as venting of exhaust steam from a back pressure turbine and oversized design of the existing turbine and pump.

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

2012-01-01T23:59:59.000Z

184

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

185

An Obstacle-avoiding Minimum Variation B-spline Problem  

E-Print Network (OSTI)

We study the problem of computing a planar curve, restricted to lie between two given polygonal chains, such that the integral of the square of arc-length derivative of curvature along the curve is minimized. We introduce the Minimum Variation B-spline problem which is a linearly constrained optimization problem over curves defined by Bspline functions only. An empirical investigation indicates that this problem has one unique solution among all uniform quartic B-spline functions. Furthermore, we prove that, for any B-spline function, the convexity properties of the problem are preserved subject to a scaling and translation of the knot sequence defining the B-spline. 1

Tomas Berglund; Inge Söderkvist

2003-01-01T23:59:59.000Z

186

Insulating gathering lines; Contractor overcomes obstacles on California oil pipelines  

Science Conference Proceedings (OSTI)

Isotherm Co. Inc., installed more than 1 million linear ft of fiberglass pipe insulation on 2- and 3-in. crude oil gathering lines at the Belridge oil field in Kern County, Calif. The project, which involved insulating 200 miles of pipeline, was completed in 7 months. In addition to the size of the project and time constraints, the contractor was faced with several other challenges, including scheduling. The way in which these challenges were met are described in this paper.

Not Available

1988-03-01T23:59:59.000Z

187

E-beam metrology:obstacles and opportunities  

Science Conference Proceedings (OSTI)

... is at a maximum at “low” operating energies and falls ... data on radiation damage in organics and polymers As the energy goes up the dose ...

188

Flying Fast and Low Among Obstacles: Methodology and Experiments  

Science Conference Proceedings (OSTI)

Safe autonomous flight is essential for widespread acceptance of aircraft that must fly close to the ground. We have developed a method of collision avoidance that can be used in three dimensions in much the same way as autonomous ground vehicles ... Keywords: Aerial robotics, learning

Sebastian Scherer; Sanjiv Singh; Lyle Chamberlain; Mike Elgersma

2008-05-01T23:59:59.000Z

189

Magnetic Wall Climbing Robot for Thin Surfaces with Specific Obstacles  

E-Print Network (OSTI)

for inspecting the interior surfaces in gas tanks made out of thin metal sheets. These surfaces were inaccessible here was designed for inspecting gas tanks that are made out of thin metal sheets and are installed and mechanical calculations for robots on magnetic wheels. The chosen concept is described in detail, explaining

Paris-Sud XI, Université de

190

Migration, Wages, and Tradition: Obstacles to Entrepreneurship in East Germany ?  

E-Print Network (OSTI)

For the last decade, the East German economy has been suffering from high unemployment and low economic growth. Policy makers often point to the lack of entrepreneurship as one of East Germany’s main problems. This paper addresses the question of how East Germany’s integration into an established economy, West Germany, may have hindered a fruitful development of entrepreneurship and how this may have affected economic growth. I build a model economy that places Lucas’s [1978] span-of-control model into an overlapping-generations framework. Following Hassler and Rodríguez Mora [2000] managerial talent is defined as a combination of two factors, intelligence and entrepreneurial parental background, and growth depends on the intelligence of entrepreneurs. In East Germany, the lack of entrepreneurial parental background makes intelligence the decisive factor in occupational choice and more intelligent entrepreneurs should contribute to high growth rates. However, three key aspects of its integration into West Germany inhibit this mechanism: 1) the unrestricted mobility of East Germans to the West, 2) the policy of fixing East German wages as fractions of West German wages, and 3) the importance of family tradition for entrepreneurship in West Germany. Counterfactual experiments show that eliminating any of these three aspects leads to more entrepreneurs, less unemployment, and higher economic growth in East Germany.

Zoë Kuehn; Job Market Paper

2009-01-01T23:59:59.000Z

191

Overcoming obstacles to lean in a repair operation  

E-Print Network (OSTI)

Over the last three decades, manufacturing companies have come to recognize the value of institutionalizing continuous improvement efforts. Most of them look to Toyota as a leader in this area and have taken Toyota's model ...

Christensen, Daniel D. (Daniel David)

2012-01-01T23:59:59.000Z

192

Obstacle aware routing in 3d integrated circuits  

Science Conference Proceedings (OSTI)

Progressive scaling of technology node has serious impacts on the performance of VLSI circuits. A major influencing factor is the dominance of interconnect delay, and its associated effects such as excessive power consumption, signal integrity issues, ...

Prasun Ghosal; Hafizur Rahaman; Satrajit Das; Arindam Das; Parthasarathi Dasgupta

2011-12-01T23:59:59.000Z

193

The 10 Obstacles to a Successful Battery Recycling Program  

Science Conference Proceedings (OSTI)

Abstract Scope, Battery recycling in North America has reached adolescence. Retailers are demanding ... Role of Recycling in the Life Cycle of Batteries.

194

ECOSYSTEM COMPONENT CHARACTERIZATION 461 Failing or nearby septic tank systems  

E-Print Network (OSTI)

or natural environment Leaks from underground storage tanks and pipes are a common source of soil.g., petroleum refineries. Pipes that are plugged or collapsed, as well as leaking storage tanks, may cause: · Sanitary wastewater sources: ­ Raw sanitary wastewater from improper sewerage connections, exfiltration

Pitt, Robert E.

195

NERSC Helps Nearby Supernova Factory Discover Supernovae at a...  

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

rate of eight per month is made possible by a high-speed data link, custom data pipeline software, and NERSC's ability to store and process 50 gigabytes of data every night....

196

Cerro Prieto cold water injection: effects on nearby production wells  

E-Print Network (OSTI)

reservoir wells close to injection well E-6 along with theMeeting. Most of the injection wells are open to the Alphaand completing new injection wells is lower than in the East

Truesdell, A.H.

2010-01-01T23:59:59.000Z

197

A high-dispersion molecular gas component in nearby galaxies  

E-Print Network (OSTI)

We present a comprehensive study of the velocity dispersion of the atomic (HI) and molecular (H2) gas components in the disks (R gas) and HERACLES (molecular gas) surveys. To obtain reliable measurements of the velocity dispersion, we stack regions several kilo-parsecs in size, after accounting for intrinsic velocity shifts due to galactic rotation and large-scale motions. We stack using various parameters: the galacto-centric distance, star formation rate surface density, HI surface density, H2 surface density, and total gas surface density. We fit single Gaussian components to the stacked spectra and measure median velocity dispersions for HI of 11.9 +/- 3.1 km/s and for H2 of 12.0 +/- 3.9 km/s. The CO velocity dispersions are thus, surprisingly, very similar to the corresponding ones of HI, with an average ratio of sigma(HI)/sigma(CO) = 1.0 +/- 0.2 i...

Caldu-Primo, Anahi; Walter, Fabian; Leroy, Adam; Sandstrom, Karin; de Blok, W J G; Ianjamasimanana, Roger; Mogotsi, K M

2013-01-01T23:59:59.000Z

198

A BUBBLING NEARBY MOLECULAR CLOUD: COMPLETE SHELLS IN PERSEUS  

SciTech Connect

We present a study of the shells (and bubbles) in the Perseus molecular cloud using the COMPLETE survey large-scale {sup 12}CO(1-0) and {sup 13}CO(1-0) maps. The 12 shells reported here are spread throughout most of the Perseus cloud and have circular or arc-like morphologies with a range in radius of about 0.1-3 pc. Most of them have not been detected before most likely because maps of the region lacked the coverage and resolution needed to distinguish them. The majority of the shells are coincident with infrared nebulosity of similar shape and have a candidate powering source near the center. We suggest that they are formed by the interaction of spherical or very wide angle winds powered by young stars inside or near the Perseus molecular cloud-a cloud that is commonly considered to be forming mostly low-mass stars. Two of the 12 shells are powered by high-mass stars close to the cloud, while the others appear to be powered by low- or intermediate-mass stars in the cloud. We argue that winds with a mass loss rate of about 10{sup -8} to 10{sup -6} M{sub Sun} yr{sup -1} are required to produce the observed shells. Our estimates indicate that the energy input rate from these stellar winds is similar to the turbulence dissipation rate. We conclude that in Perseus the total energy input from both collimated protostellar outflows and powerful spherical winds from young stars is sufficient to maintain the turbulence in the molecular cloud. Large-scale molecular line and IR continuum maps of a sample of clouds will help determine the frequency of this phenomenon in other star-forming regions.

Arce, Hector G. [Department of Astronomy, Yale University, New Haven, CT 06520 (United States); Borkin, Michelle A. [School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138 (United States); Goodman, Alyssa A. [Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 (United States); Pineda, Jaime E. [ESO, 85748 Garching (Germany); Beaumont, Christopher N., E-mail: hector.arce@yale.edu, E-mail: michelle_borkin@harvard.edu, E-mail: agoodman@cfa.harvard.edu, E-mail: jaime.pineda@manchester.ac.uk, E-mail: beaumont@ifa.hawaii.edu, E-mail: cbeaumont@cfa.harvard.edu [Institute for Astronomy, University of Hawaii at Manoa, Honolulu, HI 96822 (United States)

2011-12-01T23:59:59.000Z

199

Tropical Forest Fragments Enhance Pollinator Activity in Nearby Coffee Crops  

E-Print Network (OSTI)

accounted for >90% of all floral visits in distant sites. The gradient from the riparian strip showed visitation rates by over 50% in distant sites (where Apis was almost the only pollinator). In near sites dependence on a single introduced pollinator. Exploring the economic links between forest preservation

Vermont, University of

200

Cerro Prieto cold water injection: effects on nearby production wells  

DOE Green Energy (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

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

REVEALING COMPANIONS TO NEARBY STARS WITH ASTROMETRIC ACCELERATION  

SciTech Connect

A subset of 51 Hipparcos astrometric binaries among FG dwarfs within 67 pc has been surveyed with the Near-Infrared Coronagraphic Imager adaptive optics system at Gemini-S, directly resolving for the first time 17 subarcsecond companions and 7 wider ones. Using these data together with published speckle interferometry of 57 stars, we compare the statistics of resolved astrometric companions with those of a simulated binary population. The fraction of resolved companions is slightly lower than expected from binary statistics. About 10% of astrometric companions could be 'dark' (white dwarfs and close pairs of late M-dwarfs). To our surprise, several binaries are found with companions too wide to explain the acceleration. Re-analysis of selected intermediate astrometric data shows that some acceleration solutions in the original Hipparcos catalog are spurious.

Tokovinin, Andrei [Cerro Tololo Inter-American Observatory, Casilla 603, La Serena (Chile); Hartung, Markus; Hayward, Thomas L. [Gemini Observatory, Southern Operations Center, Casilla 603, La Serena (Chile); Makarov, Valeri V., E-mail: atokovinin@ctio.noao.edu, E-mail: mhartung@gemini.edu, E-mail: thayward@gemini.edu, E-mail: valeri.makarov@usno.navy.mil [US Naval Observatory, 3450 Massachusetts Sve. NW, Washington, DC 20392-5420 (United States)

2012-07-15T23:59:59.000Z

202

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

203

Prediction of Wind Speed, Direction and Diffusivity under Neutral Conditions for Tall Stacks  

Science Conference Proceedings (OSTI)

A one dimensional model of the neutral planetary boundary layer is used to predict the wind velocity and coefficient of eddy diffusivity throughout the 2-km planetary boundary layer. Comparison with routine radiosonde observations show that at ...

Nirupama Raghavan; Swati Basu

1988-03-01T23:59:59.000Z

204

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

205

Internal Hydraulic Jumps and Overturning Generated by Tidal Flow over a Tall Steep Ridge  

Science Conference Proceedings (OSTI)

Recent observations from the Hawaiian Ridge indicate episodes of overturning and strong dissipation coupled with the tidal cycle near the top of the ridge. Simulations with realistic topography and stratification suggest that this overturning has ...

Sonya Legg; Jody Klymak

2008-09-01T23:59:59.000Z

206

Structural systems and tuned mass dampers of super-tall buildings : case study of Taipei 101  

E-Print Network (OSTI)

The design of the first generation of skyscrapers was based on strength. Heavy masonry cladding and wall curtains used at that period added a considerable amount of stiffness and damping to the structure. Inter-storey ...

Kourakis, Ioannis

2007-01-01T23:59:59.000Z

207

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

E-Print Network (OSTI)

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

Carlot, Julien (Julien Alexandre Laurent)

2012-01-01T23:59:59.000Z

208

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

DOE Green Energy (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

209

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

E-Print Network (OSTI)

??Fire in buildings can have a severe impact in terms of both human safety and potential economic loss. This is especially true in the case… (more)

Fletcher, Ian A

2009-01-01T23:59:59.000Z

210

Soiling patterns on a tall limestone building: Changes over 60 years  

SciTech Connect

Soiling of limestone caused by air pollution has been studied at the Cathedral of Learning on the University of Pittsburgh campus. The Cathedral was constructed in the 1930s during a period of heavy pollution in Pittsburgh, PA. Archival photographs show that the building became soiled while it was still under construction. Reductions in air pollutant concentrations began in the late 1940s and 1950s and have continued to the present day. Concurrent with decreasing pollution, soiled areas of the stone have been slowly washed by rain, leaving a white, eroded surface. The patterns of white areas in archival photographs of the building are consistent with computer modeling of rain impingement showing greater wash off rates at higher elevations and on the corners of the building. Winds during the rainstorms are predominantly form the quadrant SW to NW at this location, and wind speeds as well as rain intensities are greater when winds are from this quadrant as compared with other quadrants; the sides of the building facing these directions are much less soiled than the opposing sides. Overall, these results suggest that rain washing of soiled areas on buildings occurs over a period of decades, in contrast to the process of soiling that occurs much more rapidly.

Davidson, C.I.; Tang, W.; Finger, S.; Etyemezian, V.; Striegel, M.F.; Sherwood, S.I.

2000-02-15T23:59:59.000Z

211

A Design for Unattended Monitoring of Carbon Dioxide on a Very Tall Tower  

Science Conference Proceedings (OSTI)

Unattended measurements of carbon dioxide (CO2) mixing ratio at three altitudes up to 496 m above the surface on a television transmitter tower in the southeastern United States have been made for a period of 4 yr. This report describes the ...

Cong Long Zhao; Peter S. Bakwin; Pieter P. Tans

1997-10-01T23:59:59.000Z

212

Characterization of reinforced fill soil, soil-reinforcement interaction, and internal stability of very tall MSE walls.  

E-Print Network (OSTI)

??In many geotechnical design situations involving tight right-of-way constraints, Mechanically Stabilized Earth (MSE) walls are often the most cost-effective and reliable earth retention technology among… (more)

[No author

2013-01-01T23:59:59.000Z

213

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

DOE Green Energy (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

214

Wind Energy Assessment and Visualization Laboratory Extra-Tall Tower Wind Resource Assessment: Icing Rules and Trends in the Data.  

E-Print Network (OSTI)

??This study describes the results of the measurement campaign for the Wind Energy Assessment and Visualization Laboratory (WEAV) wind feasibility study in Athens, OH. A… (more)

Harris, James C.

2012-01-01T23:59:59.000Z

215

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

Science Conference Proceedings (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

216

North American CO2 exchange: Inter comparison of modeled estimates with results from a fine scale atmospheric inversion  

E-Print Network (OSTI)

Monitoring  Division  Tall  Tower  Network,   http://These  include  two  tall  towers  with  a  height  of  dioxide  on  very  tall   towers:    Results  of  the  NOAA/

Gourdji, Sharon M.

2013-01-01T23:59:59.000Z

217

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

218

The Nonnormality of Coastal Ocean Flows around Obstacles, and Their Response to Stochastic Forcing  

Science Conference Proceedings (OSTI)

The effect of stochastic variability upon the wake downstream of a real headland is investigated. From observations taken at Bass Point, Australia, three sources of stochastic forcing are identified and quantified, these being variability in the ...

Christopher M. Aiken; Andrew M. Moore; Jason H. Middleton

2002-10-01T23:59:59.000Z

219

The practical obstacles of data transfer: why researchers still love scp  

Science Conference Proceedings (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. Unfortunately, with great computing capability does not come great long-term data storage ... Keywords: GridFTP, WAN performance, WAN usability, data transfer, high performance computing

Hai Ah Nam, Jason Hill, Suzanne Parete-Koon

2013-11-01T23:59:59.000Z

220

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

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

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

222

The Nagorno Karabakh Conflict. Causes of the conflict and obstacles to conflict resolution.  

E-Print Network (OSTI)

??Since 1988, the states of Armenia and Azerbaijan have been engaged in conflict over the enclave of Nagorno Karabakh. The conflict has developed into one… (more)

Nikkar-Esfahani, Hamidreza

2009-01-01T23:59:59.000Z

223

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

SciTech Connect

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

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

2009-03-01T23:59:59.000Z

224

Decreasing Energy Use by 50% in Swedish Multifamily buildings by 2050 - Obstacles and Opportunities.  

E-Print Network (OSTI)

?? Building sector in Sweden constitutes a major part of the overall energy consumption, making up for around 40% of the total energy use. During… (more)

Shafqat, Omar

2012-01-01T23:59:59.000Z

225

The online obstacle : a study of African-American enterprise on the Internet  

E-Print Network (OSTI)

Iconic Web companies based in the US, along the likes of Google, Facebook, and Twitter, have exhibited some racial/ethnic diversity among their founders, yet there appears to be a dearth of African-Americans in the group. ...

Lamb, Allen T. (Allen Terrel)

2010-01-01T23:59:59.000Z

226

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

E-Print Network (OSTI)

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

Simonson, Kristin (Kristin Andrea)

2011-01-01T23:59:59.000Z

227

Lessons from our elders: identifying obstacles to digital literacy through direct engagement  

Science Conference Proceedings (OSTI)

In today's world, technological change outpaces many people's ability to comprehend or trust it, let alone embrace it. It is vitally important that developers of pervasive technology for the elderly are grounded in the needs, experience, and capabilities ... Keywords: community outreach, digital literacy, elderly, gerontechnology

Shreya Kumar, Leo C. Ureel, II, Harriet King, Charles Wallace

2013-05-01T23:59:59.000Z

228

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

E-Print Network (OSTI)

. Following Thorn's experimental result, J ackson took d to be the height at which the canopy drag appears to act, and then demonstrated that d was also related to the displacement thickness of the total shear stress (which in­ cludes, for a periodic array... in experimental values of zo/ h. These arguments are plausible, but neither Thorn nor J ackson offered any physical picture to underlie this definition of d and the h - d dependence of zoo A solution to all three difficulties described above is to construct a...

Jerram, Neil

1996-06-18T23:59:59.000Z

229

Mobile Grid Routing Algorithm in Mobile Ad Hoc Networks with Obstacles  

Science Conference Proceedings (OSTI)

Mobile grid provides mobile devices with a high reliability, performance and cost-efficiency. Physical limitations of the mobile devices make necessary the adaptation of the services that mobile grid can provide to the mobile devices. In the paper, we ...

Di Wu; Ning Tong; Keqiu Li

2006-11-01T23:59:59.000Z

230

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

DOE Green Energy (OSTI)

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

Dobson, L.

1993-06-23T23:59:59.000Z

231

A Simple Reactive Obstacle Avoidance Algorithm and Its Application in Singapore Harbor  

E-Print Network (OSTI)

Autonomous surface craft (ASC) are increasingly attractive as a means for performing harbor operations including monitoring and inspection. However, due to the presence of many fixed and moving structures such as pilings, ...

Bandyophadyay, Tirthankar

2013-04-24T23:59:59.000Z

232

Access to intellectual property is a major obstacle to developing transgenic horticultural crops  

E-Print Network (OSTI)

technologies for targeted crop applications in sub- Saharanof genetically engineered crop variet- ies — such as publictransgenic horticultural crops Gregory D. Graff Brian D.

Graff, Gregory D.; Wright, Brian D.; Bennett, Alan B.; Zilberman, David

2004-01-01T23:59:59.000Z

233

Understanding Farmers’ Forecast Use from Their Beliefs, Values, Social Norms, and Perceived Obstacles  

Science Conference Proceedings (OSTI)

Although the accuracy of weather and climate forecasts is continuously improving and new information retrieved from climate data is adding to the understanding of climate variation, use of the forecasts and climate information by farmers in ...

Qi Hu; Lisa M. Pytlik Zillig; Gary D. Lynne; Alan J. Tomkins; William J. Waltman; Michael J. Hayes; Kenneth G. Hubbard; Ikrom Artikov; Stacey J. Hoffman; Donald A. Wilhite

2006-09-01T23:59:59.000Z

234

Efficient Sensor Deployment Control Schemes and Performance Evaluation for Obstacle and Unknown Environments  

Science Conference Proceedings (OSTI)

Deployment is a fundamental issue for wireless sensor networks (WSNs). A well-designed deployment control method not only directly influences the number of deployed sensors, but also influences on data accuracy and network topology. Three widely discussed ... Keywords: Deployment, Evaluate factors, Slow-start, Square-encircled, Wireless sensor networks

Hsu-Yang Kung; Chung-Ming Huang; Hao-Hsaing Ku

2008-04-01T23:59:59.000Z

235

Obstacles and opportunities in the commercialization of the solid-state-electronic fluorescent-lighting ballast  

SciTech Connect

The Solid State Ballast (SSB) Program, aimed at improving the efficiency of fluorescent lights, is described. The first generation of solid state electronic ballasts has been developed and the technology has been transferred to the private sector. This report examines the opportunities for rapid dissemination of this technology into the marketplace. It includes a description of product characteristics and their influence on the commercialization of the SSB, a description of the technology delivery system presently used by the ballast industry, an analysis of the market for SSB, and identification of some high-leverage opportunities to accelerate the commercialization process. (MCW)

Johnson, D.R.; Marcus, A.A.; Campbell, R.S.; Sommers, P.; Skumatz, L.; Berk, B.; Petty, P.; Eschbach, C.

1981-10-01T23:59:59.000Z

236

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

E-Print Network (OSTI)

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

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

2008-03-24T23:59:59.000Z

237

THE NUCLEAR X-RAY EMISSION OF NEARBY EARLY-TYPE GALAXIES  

SciTech Connect

Nuclear hard X-ray luminosities (L{sub X,nuc}) for a sample of 112 early-type galaxies within a distance of 67 Mpc are used to investigate their relationship with the central galactic black hole mass M{sub BH} (coming from direct dynamical studies or the M{sub BH}-{sigma} relation), the inner galactic structure (using the parameters describing its cuspiness), the hot gas content, and the core radio luminosity. For this sample, L {sub X,nuc} ranges from 10{sup 38} to 10{sup 42} erg s{sup -1}, and the Eddington ratio L{sub X,nuc}/L {sub Edd} from 10{sup -9} to 10{sup -4}, with the largest values belonging to four Seyfert galaxies. Together with a trend for L{sub X,nuc} to increase on average with the galactic luminosity L{sub B} and M{sub BH}, there is a wide variation of L{sub X,nuc} (and L{sub X,nuc}/L {sub Edd}), by up to 4 orders of magnitude, at any fixed L{sub B} > 6 x 10{sup 9} L{sub B,sun} or M{sub BH} > 10{sup 7} M{sub sun}. This large observed range should reflect a large variation of the mass accretion rate M-dot{sub BH}, and possible reasons for this difference are searched for. On the circumnuclear scale, in a scenario where accretion is (quasi) steady, M-dot{sub BH} at fixed L{sub B} (or M{sub BH}) could vary due to differences in the fuel production rate from stellar mass return linked to the inner galactic structure; a trend of L {sub X,nuc} with cuspiness is not observed, though, while a tendency for L{sub X,nuc}/L {sub Edd} to be larger in cuspier galaxies is present. In fact, M-dot {sub BH} is predicted to vary with cuspiness by a factor exceeding a few only in hot gas-poor galaxies and for large differences in the core radius; for a subsample with these characteristics the expected effect seems to be present in the observed L{sub X,nuc} values. L{sub X,nuc} does not show a dependence on the age of the stellar population in the central galactic region, for ages >3 Gyr; less luminous nuclei, though, are found among the youngest galaxies or galaxies with a younger stellar component. On the global galactic scale, L{sub X,nuc} shows a trend with the total galactic hot gas cooling rate (L{sub X,ISM}): it is detected both in gas-poor and gas-rich galaxies, and on average increases with L{sub X,ISM}, but again with a large scatter. The observed lack of a tight relationship between L{sub X,nuc} and the circumnuclear and total gas content can be explained if accretion is regulated by factors overcoming the importance of fuel availability, as (1) the gas is heated by black hole feedback and M-dot {sub BH} varies due to an activity cycle, and (2) the mass effectively accreted by the black hole can be largely reduced with respect to that entering the circumnuclear region, as in radiatively inefficient accretion with winds/outflows. Finally, differently from L{sub X,nuc}, the central 5 GHz VLA luminosity shows a clear trend with the inner galactic structure that is similar to that shown by the total soft X-ray emission; therefore, it is suggested that they could both be produced by the hot gas.

Pellegrini, S., E-mail: silvia.pellegrini@unibo.i [Astronomy Department, University of Bologna, via Ranzani 1, 40127 Bologna (Italy)

2010-07-10T23:59:59.000Z

238

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

239

Properties of the Intracluster Medium in an Ensemble of Nearby Galaxy Clusters  

E-Print Network (OSTI)

We present a systematic analysis of the intracluster medium (ICM) in an X-ray flux limited sample of 45 galaxy clusters. Using archival ROSAT PSPC data and published ICM temperatures, we present best fit double and single beta model profiles and extract ICM central densities and radial distributions. We use numerical cluster simulations to estimate uncertainties for all measurements. We examine the ICM properties within the context of models of structure formation and galaxy feedback. We present best fit ICM mass-temperature MICM-TX relations for MICM calculated within R500 and 1Mpc. These relations exhibit small scatter (17%), providing evidence of regularity in large, X-ray flux limited cluster ensembles. The slope of the MICM-TX relation (at limiting radius R500) is steeper than the self-similar expectation by 4.3sigma. There is a mild dependence of ICM mass fraction fICM on TX; the clusters with ICM temperatures below 5keV have a lower mass fraction =0.160\\pm0.008 than hotter clusters =0.212\\pm0.006 (H0=50; 90% conf intervals). Our large, X-ray flux limited cluster sample provides no evidence for a more extended radial ICM distribution in low TX clusters down to the sample limit of 2.4keV. We find that density variations in simulated clusters cause MICM to be overestimated by 12%. We also use simulations to estimate an fICM depletion factor at R500. We use the bias corrected mean fICM within the hotter cluster subsample as a lower limit on the cluster baryon fraction. In combination with nucleosynthesis constraints this measure provides a firm upper limit on the density parameter for clustered matter Omega_M<0.36\\pm0.01 (H0=50).

Joe Mohr; Ben Mathiesen; Gus Evrard

1999-01-20T23:59:59.000Z

240

Natural radioactivity in geothermal waters, Alhambra Hot Springs and nearby areas, Jefferson County, Montana  

DOE Green Energy (OSTI)

Radioactive hot springs issue from a fault zone in crystalline rock of the Boulder batholith at Alhambra, Jefferson County, in southwestern Montana. The discharge contains high concentrations of radon, and the gross activity and the concentration of radium-226 exceed maximum levels recommended by the Environmental Protection Agency for drinking water. Part of the discharge is diverted for space heating, bathing, and domestic use. The radioactive thermal waters at measured temperatures of about 60/sup 0/C are of the sodium bicarbonate type and saturated with respect to calcium carbonate. Radium-226 in the rock and on fractured surfaces or coprecipitated with calcium carbonate probably is the principal source of radon that is dissolved in the thermal water and discharged with other gases from some wells and springs. Local surface water and shallow ground water are of the calcium bicarbonate type and exhibit low background radioactivity. The temperature, percent sodium, and radioactivity of mixed waters adjacent to the fault zone increase with depth. Samples from most of the major hot springs in southwestern Montana have been analyzed for gross alpha and beta. The high level of radioactivity at Alhambra appears to be related to leaching of radioactive material from fractured siliceous veins by ascending thermal waters, and is not a normal characteristic of hot springs issuing from fractured crystalline rock in Montana.

Leonard, R.B.; Janzer, W.J.

1977-08-01T23:59:59.000Z

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

Power Line Fault Current Coupling to Nearby Natural Gas Pipelines, Volumes 1-3  

Science Conference Proceedings (OSTI)

The Electromagnetic and Conductive Coupling Analysis of Powerlines and Pipelines (ECCAPP) computer program provides an easy-to-use method for analyzing the effects of transmission lines on gas pipelines. The program models conductive and inductive interference, enabling electrical and gas engineers to identify these effects and design mitigation systems when necessary.

1987-11-24T23:59:59.000Z

242

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

243

THE FREQUENCY OF HOT JUPITERS ORBITING NEARBY SOLAR-TYPE STARS  

Science Conference Proceedings (OSTI)

We determine the fraction of F, G, and K dwarfs in the solar neighborhood hosting hot Jupiters as measured by the California Planet Survey from the Lick and Keck planet searches. We find the rate to be 1.2% {+-} 0.38%, which is consistent with the rate reported by Mayor et al. from the HARPS and CORALIE radial velocity (RV) surveys. These numbers are more than double the rate reported by Howard et al. for Kepler stars and the rate of Gould et al. from the OGLE-III transit search; however, due to small number statistics these differences are of only marginal statistical significance. We explore some of the difficulties in estimating this rate from the existing RV data sets and comparing RV rates to rates from other techniques.

Wright, J. T. [Department of Astronomy, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802 (United States); Marcy, G. W.; Howard, A. W. [Department of Astronomy, University of California, Berkeley, CA, 94720-3411 (United States); Johnson, John Asher; Morton, T. D. [Department of Astrophysics, California Institute of Technology, MS 249-17, Pasadena, CA, 91125 (United States); Fischer, D. A., E-mail: jtwright@astro.psu.edu [Department of Astronomy, Yale University, 260 Whitney Avenue, New Haven, CT 06511 (United States)

2012-07-10T23:59:59.000Z

244

Comparing Temperature and Humidity on a Mountain Slope and in the Free Air Nearby  

Science Conference Proceedings (OSTI)

Surface temperature and humidity data measured by eight remote weather stations on a south-facing slope in the San Bernardino Mountains of Southern California were compared with temperature and humidity data measured by a rawinsonde at the same ...

Morris H. McCutchan

1983-04-01T23:59:59.000Z

245

Assessment of the risk of fatal electric shocks inside a substation and in nearby exposed areas  

SciTech Connect

A simulation approach is elaborated for the risk assessment of fatal electric shocks due to touch and step voltages that are caused inside and around substations by ground faults. The approach suggested takes into account specific effects of ground faults, depending on their location, and various exposures encountered in practice. The fibrillation thresholds and human body impedance values are modelled as random functions to match well with the available experimental data. Several typical cases are analyzed for a substation, as an illustration. The approach developed is intended to serve for a realistic analysis of risks implied by grounding system design of a substation surrounded by exposed areas.

Nahman, J.M. (Belgrade Univ. (Yugoslavia))

1990-10-01T23:59:59.000Z

246

On the Possible Association of Ultra High Energy Cosmic Rays with Nearby Active Galaxies  

SciTech Connect

Data collected by the Pierre Auger Observatory provide evidence for anisotropy in the arrival directions of cosmic rays (CRs) with energies >57 EeV that suggests a correlation with the positions of active galactic nuclei (AGN) located within {approx}75 Mpc. However, this analysis does not take into account AGN morphology. A detailed study of the sample of AGN whose positions correlate with the CR events shows that most of them are classified as Seyfert 2 and low-ionization nuclear emission-line region (LINER) galaxies which do not differ from other local AGN of the same types. Therefore, the claimed correlation between the CR events observed by the Pierre Auger Observatory and local active galaxies should be considered as resulting from a chance coincidence, if the production of the highest energy CRs is not episodic in nature, but operates in a single object on long ({ge} Myr) timescales. Additionally, most of the selected sources do not show significant jet activity, and hence--in the framework of the jet paradigm--there are no reasons for expecting them to accelerate CRs up to the highest energies, {approx}10{sup 20} eV, at all. If the extragalactic magnetic fields and the sources of these CRs are coupled with matter, it is possible that the deflection angle is larger than expected in the case of a uniform source distribution due to effectively larger fields. A future analysis has to take into account AGN morphology and may yield a correlation with a larger deflection angle and/or more distant sources. We further argue that Cen A alone could be associated with at least 4 events due to its large radio extent, and Cen B can be associated with more than 1 event due to its proximity to the Galactic plane and, correspondingly, the stronger Galactic magnetic field the ultra high energy CRs (UHECRs) encounter during propagation. If the UHECRs associated with these events are indeed accelerated by Cen A and Cen B, their deflection angles may provide information on the structure of the magnetic field in the direction of these putative sources. Future -ray observations (by, e.g., Gamma-Ray Large Area Space Telescope [GLAST], High Energy Stereoscopic System [HESS]) may provide additional clues to the nature of the accelerators of the UHECRs in the local Universe.

Moskalenko, Igor V.; Stawarz, Lukasz; Porter, Troy A.; Cheung, Chi C.

2008-05-14T23:59:59.000Z

247

CONTINUUM HALOS IN NEARBY GALAXIES: AN EVLA SURVEY (CHANG-ES). I. INTRODUCTION TO THE SURVEY  

SciTech Connect

We introduce a new survey to map the radio continuum halos of a sample of 35 edge-on spiral galaxies at 1.5 GHz and 6 GHz in all polarization products. The survey is exploiting the new wide bandwidth capabilities of the Karl G. Jansky Very Large Array (i.e., the Expanded Very Large Array) in a variety of array configurations (B, C, and D) in order to compile the most comprehensive data set yet obtained for the study of radio halo properties. This is the first survey of radio halos to include all polarization products. In this first paper, we outline the scientific motivation of the survey, the specific science goals, and the expected improvements in noise levels and spatial coverage from the survey. Our goals include investigating the physical conditions and origin of halos, characterizing cosmic-ray transport and wind speed, measuring Faraday rotation and mapping the magnetic field, probing the in-disk and extraplanar far-infrared-radio continuum relation, and reconciling non-thermal radio emission with high-energy gamma-ray models. The sample size allows us to search for correlations between radio halos and other properties, including environment, star formation rate, and the presence of active galactic nuclei. In a companion paper (Paper II) we outline the data reduction steps and present the first results of the survey for the galaxy, NGC 4631.

Irwin, Judith; Henriksen, Richard N. [Department of Physics, Engineering Physics and Astronomy, Queen's University, Kingston, ON K7L 3N6 (Canada); Beck, Rainer; Krause, Marita; Mora, Silvia Carolina; Schmidt, Philip [Max-Planck-Institut fuer Radioastronomie, Auf dem Huegel 69, 53121 Bonn (Germany); Benjamin, R. A. [Department of Physics, University of Wisconsin at Whitewater, 800 West Main Street, Whitewater, WI 53190 (United States); Dettmar, Ralf-Juergen; Miskolczi, Arpad [Astronomisches Institut, Ruhr-Universitaet Bochum, 44780 Bochum (Germany); English, Jayanne [Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2 (Canada); Heald, George; Oosterloo, Tom [Netherlands Institute for Radio Astronomy (ASTRON), Postbus 2, 7990 AA Dwingeloo (Netherlands); Johnson, Megan [National Radio Astronomy Observatory, P.O. Box 2, Greenbank, WV 24944 (United States); Li, Jiang-Tao [Department of Astronomy, University of Massachusetts, 710 North Pleasant Street, Amherst, MA 01003 (United States); Murphy, E. J. [Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101 (United States); Porter, Troy A. [Hansen Experimental Physics Laboratory, Stanford University, 452 Lomita Mall, Stanford, CA 94305 (United States); Rand, Richard J. [Department of Physics and Astronomy, University of New Mexico, 800 Yale Boulevard, NE, Albuquerque, NM 87131 (United States); Saikia, D. J. [National Centre for Radio Astrophysics, TIFR, Pune University Campus, Post Bag 3, Pune 411 007 (India); Strong, A. W. [Max-Planck-Institut fuer extraterrestrische Physik, Garching bei Muenchen (Germany); Walterbos, Rene, E-mail: irwin@astro.queensu.ca, E-mail: henriksn@astro.queensu.ca, E-mail: twiegert@astro.queensu.ca, E-mail: rbeck@mpifr-bonn.mpg.de, E-mail: mkrause@mpifr-bonn.mpg.de, E-mail: cmora@mpifr-bonn.mpg.de [Department of Astronomy, New Mexico State University, P.O. Box 30001, MSC 4500, Las Cruces, NM 88003 (United States); and others

2012-08-15T23:59:59.000Z

248

The Frequency of Hot Jupiters Orbiting Nearby Solar-Type Stars  

E-Print Network (OSTI)

We determine the fraction of F, G, and K dwarfs in the Solar Neighborhood hosting hot jupiters as measured by the California Planet Survey from the Lick and Keck planet searches. We find the rate to be 1.2\\pm0.38%, which is consistent with the rate reported by Mayor et al. (2011) from the HARPS and CORALIE radial velocity surveys. These numbers are more than double the rate reported by Howard et al. (2011) for Kepler stars and the rate of Gould et al. (2006) from the OGLE-III transit search, however due to small number statistics these differences are of only marginal statistical significance. We explore some of the difficulties in estimating this rate from the existing radial velocity data sets and comparing radial velocity rates to rates from other techniques.

Wright, J T; Howard, A W; Johnson, John Asher; Morton, T; Fischer, D A

2012-01-01T23:59:59.000Z

249

Cenozoic climate change shaped the evolutionary ecophysiology of the Cupressaceae conifers  

E-Print Network (OSTI)

impressive, with members ranging from 5-m-tall juniper shrubs to 100-m-tall redw ood trees. Phylogenetic

Pittermann, Jarmila

250

Envisioning Radical Futures -- New York City 2106: Back to the Future  

E-Print Network (OSTI)

proposes that tall curvilinear “water towers” would populatethe towers would trans- late New York’s tradition of tall

Yarinsky, Adam

2008-01-01T23:59:59.000Z

251

Regional CO2 and latent heat surface fluxes in the Southern Great Plains: Measurements, modeling, and scaling  

E-Print Network (OSTI)

a mixed forest from tall tower mixing ratio measurements,vapor measurements from a tall tower, Journal of Geophysical

Riley, W. J.

2010-01-01T23:59:59.000Z

252

Effects of Temporal Wind Patterns on the Value of Wind-Generated Electricity at Different Sites in California and the Northwest  

E-Print Network (OSTI)

or production data from tall towers are needed before we canmore data from tall anemometer towers or operational wind

Fripp, Matthias; Wiser, Ryan

2006-01-01T23:59:59.000Z

253

An Integral Formulation for the Dispersion Parameters in a Shear–Buoyancy-Driven Planetary Boundary Layer for Use in a Gaussian Model for Tall Stacks  

Science Conference Proceedings (OSTI)

An integral parameterization of the dispersion coefficients ?y and ?z in a shear–buoyancy-driven atmospheric boundary layer is developed by using a model for the frequency spectrum of eddy energy. The formulation relies on Taylor classical ...

C. Mangia; G. A. Degrazia; U. Rizza

2000-11-01T23:59:59.000Z

254

Design and experimental validation of 328 ft (100 m) tall wind turbine towers utilizing high strength and ultra-high performance concrete.  

E-Print Network (OSTI)

??With today's global capacity exceeding 280 GW, windpower has proven to be a formidable source of renewable energy worldwide. In order to keep pace with… (more)

Schmitz, Grant M.

2013-01-01T23:59:59.000Z

255

RESPONSE ROBOTS RESPONSE ROBOTS  

Science Conference Proceedings (OSTI)

... 44 44 • Terrains: Gravel (P) • Terrains: Mud (P) • Obstacles: Inclined Planes (V) • Obstacles: Gap Crossings: Static, Dynamic (V) • Obstacles: Pipe ...

2012-06-06T23:59:59.000Z

256

Structural foam-core panels in Northwest HUD-code manufactured housing: A preliminary assessment of opportunities and obstacles  

SciTech Connect

This investigation of structural foam-core panels (foam panels) in manufactured housing was initiated during the Super Good Cents (SGC) program. The SGC program limited allowable glazing area because of the relatively high thermal losses associated with most windows. Due to their superior thermal performance, foam panels appeared to be a viable option to allow increased glazing area without compromising the thermal integrity of the wall. With the inception of the Manufactured-Housing Acquisition Program (MAP), however, the focus of this study has shifted. MAP permits unlimited glazing area if expensive, super-efficient, vinyl-framed, argon-gas-filled, low-emissivity coated windows are installed. Although MAP permits unlimited glazing area, a foam panel wall could allow the use of less expensive windows, larger window area, or less insulation and still provide the required thermal performance for the building. Bonneville contracted with the Pacific Northwest Laboratory (PNL) to investigate the feasibility of using foam panels in HUD-code manufactured housing. This study presents the results from a product and literature search. The potential barriers and benefits to the use of foam panels are determined from a regional survey of the HUD-code manufacturers and foam panel producers.

Durfee, D.L.; Lee, A.D.; Onisko, S.A.

1993-07-01T23:59:59.000Z

257

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

E-Print Network (OSTI)

27 For fossil fuel-fired steam generators, for example, EPArequirements. 2 9 For the steam generators, the standard re-

Enion, Rhead M.

2012-01-01T23:59:59.000Z

258

Cortical dynamics of navigation and steering in natural scenes: Motion-based object segmentation, heading, and obstacle avoidance  

Science Conference Proceedings (OSTI)

Visually guided navigation through a cluttered natural scene is a challenging problem that animals and humans accomplish with ease. The ViSTARS neural model proposes how primates use motion information to segment objects and determine heading for purposes ... Keywords: MST, MT, Motion segmentation, Navigation, Object tracking, Optic flow, Steering

N. Andrew Browning; Stephen Grossberg; Ennio Mingolla

2009-12-01T23:59:59.000Z

259

U.S. Shared-use Vehicle Survey Findings: Opportunities and Obstacles for Carsharing and Station Car Growth  

E-Print Network (OSTI)

3) Shaheen, S.A. Pooled Cars. Access Magazine. University ofCarsharing, Station Cars, and Combined Approaches.Mandate—Linking Clean Fuel Cars, Carsharing, and Station Car

Shaheen, Susan A.; Meyn, Mollyanne; Wipyewski, Kamill

2003-01-01T23:59:59.000Z

260

DIRECT Distances to Nearby Galaxies Using Detached Eclipsing Binaries and Cepheids; 4, Variables in the Field M31D  

E-Print Network (OSTI)

We undertook a long term project, DIRECT, to obtain the direct distances to two important galaxies in the cosmological distance ladder -- M31 and M33 -- using detached eclipsing binaries (DEBs) and Cepheids. While rare and difficult to detect, DEBs provide us with the potential to determine these distances with an accuracy better than 5%. The extensive photometry obtained in order to detect DEBs provides us with good light curves for the Cepheid variables. These are essential to the parallel project to derive direct Baade-Wesselink distances to Cepheids in M31 and M33. For both Cepheids and eclipsing binaries, the distance estimates will be free of any intermediate steps. As a first step in the DIRECT project, between September 1996 and October 1997 we obtained 95 full/partial nights on the F. L. Whipple Observatory 1.2 m telescope and 36 full nights on the Michigan-Dartmouth-MIT 1.3 m telescope to search for DEBs and new Cepheids in the M31 and M33 galaxies. In this paper, fourth in the series, we present th...

Kaluzny, J; Stanek, K Z; Krockenberger, M; Sasselov, D D; Tonry, J L; Mateo, M

1999-01-01T23:59:59.000Z

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


261

DIRECT Distances to Nearby Galaxies Using Detached Eclipsing Binaries and Cepheids; 5, Variables in the Field M31F  

E-Print Network (OSTI)

We undertook a long term project, DIRECT, to obtain the direct distances to two important galaxies in the cosmological distance ladder -- M31 and M33 -- using detached eclipsing binaries (DEBs) and Cepheids. While rare and difficult to detect, DEBs provide us with the potential to determine these distances with an accuracy better than 5%. The extensive photometry obtained in order to detect DEBs provides us with good light curves for the Cepheid variables. These are essential to the parallel project to derive direct Baade-Wesselink distances to Cepheids in M31 and M33. For both Cepheids and eclipsing binaries, the distance estimates will be free of any intermediate steps. As a first step in the DIRECT project, between September 1996 and October 1997 we obtained 95 full/partial nights on the F. L. Whipple Observatory 1.2 m telescope and 36 full nights on the Michigan-Dartmouth-MIT 1.3 m telescope to search for DEBs and new Cepheids in the M31 and M33 galaxies. In this paper, fifth in the series, we present the...

Mochejska, B J; Stanek, K Z; Krockenberger, M; Sasselov, D D

1999-01-01T23:59:59.000Z

262

DIRECT Distances to Nearby Galaxies Using Detached Eclipsing Binaries and Cepheids. VI. Variables in the Central Part of M33  

E-Print Network (OSTI)

The DIRECT project aims to determine direct distances to two important galaxies in the cosmological distance ladder - M31 and M33 - using detached eclipsing binaries (DEBs) and Cepheids. We present the results of the first large-scale CCD-based search for variables in M33. We have observed two fields located in the central region of M33 for a total of 95 nights on the F. L. Whipple Observatory 1.2-m telescope and 36 nights on the Michigan-Dartmouth-MIT 1.3-m telescope. We have found a total of 544 variables, including 251 Cepheids and 47 eclipsing binaries. The catalog of variables is available online, along with finding charts and BVI light curve data (consisting of 8.2x10^4 individual measurements). The complete set of CCD frames is available upon request.

Macri, L M; Sasselov, D D; Krockenberger, M; Kaluzny, J

2001-01-01T23:59:59.000Z

263

DIRECT Distances to Nearby Galaxies Using Detached Eclipsing Binaries and Cepheids; 2, Variables in the Field M31A  

E-Print Network (OSTI)

We undertook a long term project, DIRECT, to obtain the direct distances to two important galaxies in the cosmological distance ladder -- M31 and M33, using detached eclipsing binaries (DEBs) and Cepheids. While rare and difficult to detect, detached eclipsing binaries provide us with the potential to determine these distances with an accuracy better than 5%. The massive photometry obtained in order to detect DEBs provides us with the light curves for the Cepheid variables. These are essential to the parallel project to derive direct Baade-Wesselink distances to Cepheids in M31 and M33. For both Cepheids and eclipsing binaries the distance estimates will be free of any intermediate steps. As a first step of the DIRECT project, between September 1996 and January 1997 we have obtained 36 full nights on the Michigan-Dartmouth-MIT (MDM) 1.3-meter telescope and 45 full/partial nights on the F. L. Whipple Observatory (FLWO) 1.2-meter telescope to search for detached eclipsing binaries and new Cepheids in the M31 an...

Stanek, K Z; Krockenberger, M; Sasselov, D D; Tonry, J L; Mateo, M

1998-01-01T23:59:59.000Z

264

DIRECT Distances to Nearby Galaxies Using Detached Eclipsing Binaries and Cepheids; 1, Variables in the Field M31B  

E-Print Network (OSTI)

We undertook a long term project, DIRECT, to obtain the direct distances to two important galaxies in the cosmological distance ladder - M31 and M33, using detached eclipsing binaries (DEBs) and Cepheids. While rare and difficult to detect, detached eclipsing binaries provide us with the potential to determine these distances with an accuracy better than 5%. The massive photometry obtained in order to detect DEBs provides us with good light curves for the Cepheid variables. These are essential to the parallel project to derive direct Baade-Wesselink distances to Cepheids in M31 and M33. For both Cepheids and eclipsing binaries the distance estimates will be free of any intermediate steps. As a first step of the DIRECT project, between September 1996 and January 1997 we have obtained 36 full nights on the Michigan-Dartmouth-MIT (MDM) 1.3-meter telescope and 45 full/partial nights on the F. L. Whipple Observatory (FLWO) 1.2-meter telescope to search for detached eclipsing binaries and new Cepheids in the M31 an...

Kaluzny, J; Krockenberger, M; Sasselov, D D; Tonry, J L; Mateo, M

1997-01-01T23:59:59.000Z

265

DIRECT Distances to Nearby Galaxies Using Detached Eclipsing Binaries and Cepheids; 3, Variables in the Field M31C  

E-Print Network (OSTI)

We undertook a long term project, DIRECT, to obtain the direct distances to two important galaxies in the cosmological distance ladder -- M31 and M33 -- using detached eclipsing binaries (DEBs) and Cepheids. While rare and difficult to detect, DEBs provide us with the potential to determine these distances with an accuracy better than 5%. The extensive photometry obtained in order to detect DEBs provides us with good light curves for the Cepheid variables. These are essential to the parallel project to derive direct Baade-Wesselink distances to Cepheids in M31 and M33. For both Cepheids and eclipsing binaries, the distance estimates will be free of any intermediate steps. As a first step in the DIRECT project, between September 1996 and October 1997 we obtained 95 full/partial nights on the F. L. Whipple Observatory 1.2 m telescope and 36 full nights on the Michigan-Dartmouth-MIT 1.3 m telescope to search for DEBs and new Cepheids in the M31 and M33 galaxies. In this paper, third in the series, we present the...

Stanek, K Z; Krockenberger, M; Sasselov, D D; Tonry, J L; Mateo, M

1999-01-01T23:59:59.000Z

266

Mass Models and Sunyaev-Zeldovich Effect Predictions for a Flux Limited Sample of 22 Nearby X-Ray Clusters  

E-Print Network (OSTI)

We define a 90% complete, volume-limited sample of 31 z<0.1 x-ray clusters and present a systematic analysis of public ROSAT PSPC data on 22 of these objects. Our efforts are undertaken in support of the Penn/OVRO SZE survey, and to this end we present predictions for the inverse Compton optical depth towards all 22 of these clusters. We have performed detailed Monte Carlo simulations to understand the effects of the cluster profile uncertainties on the SZE predictions given the OVRO 5.5-meter telescope beam and switching patterns; we find that the profile uncertainties are one of the least significant components of our error budget for SZE-based distance measurements. We also present baryonic masses and baryon mass fractions derived under the assumption of hydrostatic equilibrium for these 22 clusters. The mean baryonic mass fraction within R_500 \\sim 500 h^-1 kpc is (7.02 \\pm 0.28) x 10^-2 h^-3/2, or (19.8 \\pm 0.8) x 10^-2 for h=0.5. We confirm the Allen et al. (1993) claim of an excess absorbing column density towards Abell 478, but do not find similar anomalies in the other 21 clusters in our sample. We also find some evidence for an excess of soft counts in the ROSAT PSPC data. A measurement of H_o using these models and OVRO SZE determinations will be presented in a second paper.

Brian S. Mason; Steven T. Myers

1999-10-25T23:59:59.000Z

267

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

SciTech Connect

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

268

Improved performance of amorphous silicon solar cells via scattering from surface plasmon polaritons in nearby metallic nanoparticles  

E-Print Network (OSTI)

s to remove the surface oxide. A 20 nm indium tin oxide ITO contact layer was then depos- ited by rf.S. National Renewable Energy Laboratory for providing a-Si:H thin films for this work. 1 A. Luque and S An engineered enhancement in short-circuit current density and energy conversion efficiency in amorphous silicon

Yu, Edward T.

269

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

SciTech Connect

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

Looney, B.; Eddy-Dilek, C.

2012-08-28T23:59:59.000Z

270

Temperature structure of the intergalactic medium within seven nearby and bright clusters of galaxies observed with XMM-Newton  

E-Print Network (OSTI)

Aims. We map the temperature structure of the intra-cluster medium (ICM) within a nearly complete X-ray flux limited sample of galaxy clusters in the redshift range z=[0.045,0.096]. Our sample contains seven bright clusters of galaxies observed with XMM-Newton: Abell 399, Abell 401, Abell 478, Abell 1795, Abell 2029, Abell 2065, Abell 2256. Methods. We use a multi-scale spectral mapping algorithm especially designed to map spectroscopic observables from X-ray extended emission of the ICM. Derived from a former algorithm using Haar wavelets, our algorithm is now implemented with B-spline wavelets in order to perform a more regular analysis of the signal. Results. For the four clusters in our sample that are major mergers, we find a complex thermal structure with strong thermal variations consistent with their dynamics. For two of them, A2065 and A2256, we perform a 3-d analysis of cold front features evidenced from the gas temperature and brightness maps. Furthermore, we detect a significant non-radial thermal structure outside the cool core region of the other 3 more "regular" clusters, with relative amplitudes of about about 10%. We investigate possible implications of this structure on the mass estimates of the "regular" clusters A1795 and A2029, by extracting surface brightness and temperature profiles from sectors correspondings to the hottest and coldest regions in the maps. While compensating with surface brightness for A2029, leading to consistent mass profiles, the temperature structure leads to significant mass discrepancies in the innermost region of A1795.

H. Bourdin; P. Mazzotta

2008-02-13T23:59:59.000Z

271

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

SciTech Connect

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

272

Power Line Fault Current Coupling to Nearby Natural Gas Pipelines, Volume 3: Analysis of Pipeline Coating Impedance  

Science Conference Proceedings (OSTI)

As regulatory agencies encourage construction of transmission lines and gas pipelines along shared utility corridors, the likelihood of voltage and current coupling increases. Development of equations that determine the electrical characteristics of pipeline coatings will help utility engineers to accurately predict induced voltages and currents.

1988-08-01T23:59:59.000Z

273

A Study On High Voltage AC Power Transmission Line Electric And Magnetic Field Coupling With Nearby Metallic Pipelines.  

E-Print Network (OSTI)

??In the recent years, there has been a trend to run metallic pipelines carrying petroleum products and high voltage AC power lines parallel to each… (more)

Gupta, Abhishek

2006-01-01T23:59:59.000Z

274

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

E-Print Network (OSTI)

and their Essential Role in Modern Science William E. Johnston, ESnet Adviser and Senior Scientist Chin Guok of Science and ESnet ­ the ESnet Mission · The Office of Science (SC) is the single largest supporter supercomputers - that generate massive amounts of data and involve very large, distributed collaborations · ESnet

275

ASTEROSEISMOLOGY OF THE NEARBY SN II PROGENITOR RIGEL. II. {epsilon}-MECHANISM TRIGGERING GRAVITY-MODE PULSATIONS?  

SciTech Connect

The cores of luminous B- and A-type (BA) supergiant stars are the seeds of later core-collapse supernovae. Thus, constraining the near-core conditions in this class of stars can place tighter constraints on the size, mass, and chemical composition of supernova remnants. Asteroseismology of these massive stars is one possible approach into such investigations. Recently, Moravveji et al. in 2012 (hereafter Paper I) extracted 19 significant frequencies from a 6-year radial velocity monitoring of Rigel ({beta} Ori, B8 Ia). The periods they determined broadly range from 1.22 to 74.74 days. Based on our differentially rotating stellar structure and evolution model, Rigel, at its current evolutionary state, is undergoing core He burning and shell H burning. Linear fully non-adiabatic non-radial stability analyses result in the excitation of a dense spectrum of non-radial gravity-dominated mixed modes. The fundamental radial mode (l = 0) and its overtones are all stable. When the hydrogen-burning shell is located even partially in the radiative zone, a favorable condition for destabilization of g-modes through the so-called {epsilon}-mechanism becomes viable. Only those g-modes that have high relative amplitudes in the hydrogen-burning (radiative) zone can survive the strong radiative damping. From the entire observed range of variability periods of Rigel (found in Paper I), and based on our model, only those modes with periods ranging between 21 and 127 days can be theoretically explained by the {epsilon}-mechanism. The origin of the short-period variations (found in Paper I) still remains unexplained. Because Rigel is similar to other massive BA supergiants, we believe that the {epsilon}-mechanism may be able to explain the long-period variations in {alpha} Cygni class of pulsating stars.

Moravveji, Ehsan [Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731 (Iran, Islamic Republic of); Moya, Andres [Departamento de Astrofisica, Centro de Astrobiologia (INTA-CSIC), P.O. Box 78, 28691 Villanueva de la Canada, Madrid (Spain); Guinan, Edward F., E-mail: moravveji@iasbs.ac.ir [Department of Astronomy, Villanova University, 800 Lancaster Avenue, Villanova, PA (United States)

2012-04-10T23:59:59.000Z

276

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

SciTech Connect

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

277

Analyzing the Effects of Temporal Wind Patterns on the Value of Wind-Generated Electricity at Different Sites in California and the Northwest  

E-Print Network (OSTI)

or production data from tall towers are needed before we canhub-height data from tall-tower anemometers or operatingor production data from tall towers are needed before we can

Fripp, Matthias; Wiser, Ryan

2006-01-01T23:59:59.000Z

278

New Urbanism: "The Vancouver Model" [Speaking of Places  

E-Print Network (OSTI)

Hong Kong rules created tall, thin towers. These built-forms, preference for tall, thin towers. The Hong Kong buildingbecome a has built tall, thin towers there that are homes to

Boddy, Trevor

2004-01-01T23:59:59.000Z

279

The Vertical Turn: Topographies of Metropolitan Modernism  

E-Print Network (OSTI)

pastoral city, with the tall tower standing as a guidingreach a church with a tall tower, which she climbs up. Then,tall sequoia trees outside the city, and of course the church tower

Haacke, Paul

2011-01-01T23:59:59.000Z

280

The MODIS (Collection V005) BRDF/albedo product: Assessment of spatial representativeness over forested landscapes  

E-Print Network (OSTI)

as observed from a very tall tower. Global Change Biology,will be the case for a tall tower instrument setup which isWLEF-ChEAS Park Falls tall tower (Fig. 5G) has the largest

2009-01-01T23:59:59.000Z

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


281

Water Vapor Variability Across Spatial Scales: Insights for Theory, Parameterization, and Model Assessment  

E-Print Network (OSTI)

3 Spatial Structure Function Analysis of Very Tall Tower 3.1as observed from a very tall tower. Global Change Biology,mea- surements from a tall tower. Extended Abstracts, 13th

Pressel, Kyle Gregory

2012-01-01T23:59:59.000Z

282

Quantifying the ecosystem-scale emission and deposition fluxes of biogenic volatile organic compounds (BVOC) and their oxidation products above plant canopies  

E-Print Network (OSTI)

schedule on the 18 m tall tower during BEARPEX 2009. Theschedule on the 18 m tall tower during BEARPEX 2009. The2010). A new 18 m tall scaffolding tower was built in 2007

Park, Jeong-Hoo

2012-01-01T23:59:59.000Z

283

Report Sample 5  

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

tall Fermenter 2 102,000 gallons, 82 feet tall Fermenter 3 73,000 gallons, 82 feet tall Fermentation PLC Building 150 square feet Gypsum and Lime Area Gypsum Filter, Lime...

284

Are tropical forests near a high temperature threshold?  

E-Print Network (OSTI)

and a 30-m tall tower at km-83. The km-83 scaffold wasground level on a 67-m tall tower (Rohn 55G, Rohn, Peoria,field sites, working off a 45-m tall scaffold tower at km-67

Doughty, Christopher E.; Goulden, Michael L.

2008-01-01T23:59:59.000Z

285

The Strip: Las Vegas and the Symbolic Destruction of Spectacle  

E-Print Network (OSTI)

It was a 1,149 foot tall tower – the tallest freestandingfront of the towers stood a 150-foot tall replica of Statuea “Champagne Tower,” a 20-foot wide diameter, 80-foot tall

Al, Stefan Johannes

2010-01-01T23:59:59.000Z

286

Development of an Implementation Plan for Atmospheric Carbon Monitoring in California  

E-Print Network (OSTI)

carbon dioxide on very tall towers: results of the NOAA/CMDLDioxide on a Very Tall Tower. Tellus Series B-Chemical &vapor measurements from a tall tower. JGR-Atmospheres 109:

Fischer, Marc L.; Riley, William J.; Tonse, Shaheen

2004-01-01T23:59:59.000Z

287

An experimental and numerical study of wind turbine seismic behavior  

E-Print Network (OSTI)

turbine with an 18 m tall tower and 13 m rotor diameter. Inwith a 38 meter tall steel tower designed for installationturbine with a 44 m tall steel tower and 52 m rotor diameter

Prowell, I.

2011-01-01T23:59:59.000Z

288

NIST Radio Station WWV  

Science Conference Proceedings (OSTI)

... Each antenna is mounted on a tower that is approximately one half-wavelength tall. The tallest tower, for 2.5 MHz, is about 60 m tall. ...

2011-12-23T23:59:59.000Z

289

BIOMETRIC AND MICROMETEOROLOGICAL MEASUREMENTS OF TROPICAL FOREST CARBON BALANCE  

E-Print Network (OSTI)

dioxide fluxes from a very tall tower in a northern forest:67 m tall, 46 cm triangular cross section tower (model 55G;

2004-01-01T23:59:59.000Z

290

Calibration of the Total Carbon Column Observing Network using Aircraft Profile Data  

E-Print Network (OSTI)

abundances at the Wisconsin Tall Tower site, J. Geophys.Fractions from the NOAA ESRL Tall Tower Network, 1992-2009,

Wunch, Debra

2010-01-01T23:59:59.000Z

291

Insuring the City: The Prudential Center and the Reshaping of Boston  

E-Print Network (OSTI)

setting for the 750-foot tall tower, CLA designed a slimtower that housed the service core, and also served as a dramatic billboard for 8’-tall

Rubin, Elihu James

2009-01-01T23:59:59.000Z

292

Rebuilding London's Landscape [Landscape as Mentor  

E-Print Network (OSTI)

proposed one-thousand-foot-tall tower. People say that it isdo you decide how tall Foster’s tower should be? London sits

Shepheard, Paul

2000-01-01T23:59:59.000Z

293

The Role of Prior Knowledge and Problem Contexts in Students' Explanations of Complex System  

E-Print Network (OSTI)

fall down. [gestures the tall tower of sand falling down].if you imagine a tower of sand [gestures a tall dune] umm,

Barth-Cohen, Lauren April

2012-01-01T23:59:59.000Z

294

First order structure function analysis of statistical scale invariance n the AIRS Observed Water Vapor Field  

E-Print Network (OSTI)

measure- ments from a tall tower. http://ams.confex.com/the 396 m level of a tall tower display a nocturnal increase

Pressel, K.G.

2013-01-01T23:59:59.000Z

295

U.S. DEPARTMENT OF ENERGY * SAVANNAH RIVER ...  

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

through a field study in which tracer gas was released from 12 locations upwind of the Tall Tower. Meteorological and tracer gas concentration data were collected from Tall...

296

Fish and Wildlife Response Letter for Clipper Windpower Project...  

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

includes one 262-foot tall wind turbine and associatedfacilities including a 240-foot tall meteorological tower (lattice- guyed type), 400 square foot building, and underground...

297

On the Description and Greatness of Mexico City: A Translation of Book 4, Chapters 24 and 25, of Francisco Cervantes de Salazar's Crónica de la conquista de la Nueva Espańa  

E-Print Network (OSTI)

very strong with two tall limestone towers. The entire housetower in the city it was a great relief for the travelers to see it rising so tall;

Bono, Dianne M.

1991-01-01T23:59:59.000Z

298

Atmospheric Inverse Estimates of Methane Emissions from Central California  

E-Print Network (OSTI)

mixing ratios measured at a tall-tower are compared to modelmade at 91 and 483 m on a tall-tower near Walnut Grove, CA (

Zhao, Chuanfeng

2009-01-01T23:59:59.000Z

299

Clipper Windpower Draft Environmental Assessment DOE/EA 1516...  

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

includes one 262-foot tall wind turbine and associatedfacilities such as a 240-foot tall meteorological tower, 400 square foot building, and underground electric lines. You...

300

Marjorie Alexander Joins the Army  

E-Print Network (OSTI)

tall structures that stood out, one looking like a water tower,tall steeple, the third tallest structure on the base behind the two towers,

Dean, Laurel Roberta

2013-01-01T23:59:59.000Z

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

A method for evaluating bias in global measurements of CO2 total columns from space  

E-Print Network (OSTI)

abundances at the Wisconsin Tall Tower site, J. Geophys.from the co-located tall tower when they were available.

Wunch, D.

2013-01-01T23:59:59.000Z

302

Observation of CH4 and other Non-CO2 Green House Gas Emissions from California  

E-Print Network (OSTI)

long-lived GHGs at two tall-towers in central California.made by a future network of tall-tower stations spread over

Fischer, Marc L.

2009-01-01T23:59:59.000Z

303

Minimizing Detection Probability Routing in Ad Hoc Networks Using Directional Antennas  

E-Print Network (OSTI)

electromagnetic noise. The ratio of the total received signal power to the total noise which includes thermal and system noise plus total interference is denoted as SNIR [21]. Hence, the detection event occurs if and only if the SNIR is larger than a threshold ?... of interference is assumed to be zero in our study. Free-space path loss (FSPL) is the loss in signal strength of an electromagnetic wave that would result from a line of sight path through free space, with no obstacles nearby to cause reflection or diffraction...

2009-06-08T23:59:59.000Z

304

Grasshopper Biology  

NLE Websites -- All DOE Office Websites (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

305

Industrial Use of Fish Oils UNITED STATES DEPART MENT OF THE INTERIOR  

E-Print Network (OSTI)

tallow and grease, coconut, soybean, linseed, castor, sperm, and tall oil. Supplies of fish oil could

306

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.

307

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)

to realize it." Most recently, seven KCCstudents built a hot-pink "CanSat," or cannister satellite projects: growing tumor cells to investigate cancer and to produce DNA; using mice to make antibodies-Heldt earned national distinction in cell and molecular biology for building a new method to measure bacterial

308

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

309

Case study analysis of the legal and institutional obstacles and incentives to the development of the hydroelectric power of the Boardman River at Traverse City, Michigan  

SciTech Connect

An analytic description of one decision-making process concerning whether or not to develop the hydroelectric potential of the Boardman River is presented. The focus of the analysis is on the factor that the developers considered, or should consider in making a responsible commitment to small-scale hydroelectric development. Development of the Boardman River would occur at the five dam sites. Two existing dams, owned by the county, previously generated hydroelectricity, as did a third before being washed out. One dam has never been utilized. It is owned by the city which also owns the washed-out area. The study concludes that hydroelectric power is feasible at each. Grand Traverse County and Traverse City would engage in a joint venture in developing the resource. Chapter I presents a detailed description of the developers, the river resource, and the contemplated development. Chapter II is an analysis of the factors affecting the decision making process. Chapter III summarizes the impact of the more significant barriers and incentives and presents recommendations that, if implemented, will favorably affect decisions to develop small-scale hydroelectric generation capability.

1980-05-01T23:59:59.000Z

310

Dynamic behavior of plasma-facing materials during plasma instabilities in tokamak reactors  

SciTech Connect

Damage to plasma-facing and nearby components due to plasma instabilities remains a major obstacle to a successful tokamak concept. The high energy deposited on facing materials during plasma instabilities can cause severe erosion, plasma contamination, and structural failure of these components. Erosion damage can take various forms such as surface vaporization, spallation, and liquid ejection of metallic materials. Comprehensive thermodynamic and radiation hydrodynamic codes have been developed, integrated, and used to evaluate the extent of various damage to plasma-facing and nearby components. The eroded and splashed materials will be transported and then redeposited elsewhere on other plasma-facing components. Detailed physics of plasma/solid-liquid/vapor interaction in a strong magnetic field have been developed, optimized, and implemented in a self-consistent model. The plasma energy deposited in the evolving divertor debris is quickly and intensely reradiated, which may cause severe erosion and melting of other nearby components. Factors that influence and reduce vapor-shielding efficiency such as vapor diffusion and turbulence are also discussed and evaluated.

Hassanein, A. [Argonne National Lab., IL (United States); Konkashbaev, I. [Troitsk Inst. for Innovation and Fusion Research (Russian Federation)

1997-09-01T23:59:59.000Z

311

Comprehensive physical models and simulation package for plasma/material interactions during plasma instabilities.  

SciTech Connect

Damage to plasma-facing components (PFCS) from plasma instabilities remains a major obstacle to a successful tokamak concept. The extent of the damage depends on the detailed physics of the disrupting plasma, as well as on the physics of plasma-material interactions. A comprehensive computer package called High Energy Interaction with General Heterogeneous Target Systems (HEIGHTS) has been developed and consists of several integrated computer models that follow the beginning of a plasma disruption at the scrape-off layer (SOL) through the transport of the eroded debris and splashed target materials to nearby locations as a result of the deposited energy. The package can study, for the first time, plasma-turbulent behavior in the SOL and predict the plasma parameters and conditions at the divertor plate. Full two-dimensional (2-D) comprehensive radiation magnetohydrodynamic (MHD) models are coupled with target thermodynamics and liquid hydrodynamics to evaluate the integrated response of plasma-facing materials. Factors that influence the lifetime of plasma-facing and nearby components, such as loss of vapor-cloud confinement and vapor removal due to MHD effects, damage to nearby components due to intense vapor radiation, melt splashing, and brittle destruction of target materials, are also modeled and discussed.

Hassanein, A.

1998-08-26T23:59:59.000Z

312

Results of deep exploratory drilling between long and Newark Valleys, White Pine County, Nevada - implications for oil migration in the nearby Yankee gold mine paleohydrothermal system  

Science Conference Proceedings (OSTI)

In mid-1992, a consortium headed by Pioneer Oil and Gas (Midvale, Utah) drilled a deep (6700 ft) exploratory well in the southern Ruby Mountains-Buck Mountain are near the Alligator Ridge mining district in White Pine County, Nevada. The test well is located 1.5 mi southwest of USMX, Inc.'s, Yankee gold mine, an open-pit operation centered on a Carlin-type, sediment-hosted gold orebody noteworthy for containing abundant, fracture-controlled live oil. The Pioneer well as dry, but intersected much of the same stratigraphic section hosting gold at Yankee, thereby providing valuable clues to mechanisms of oil migration at this unusual, oil-bearing precious-metal deposit. Most of the gold at Yankee is hosted by the Devonian Pilot Shale, with a basal argillaceous limestone containing the bulk of the deposit's live oil. The equivalent section in the Pioneer wildcat well is a silty calcareous dolomite. Whereas the basal Pilot limestone at Yankee is rich in thick, locally gold- and arsenic-anomalous calcite veins and modules hosting abundant oil-bearing fluid inclusion, the basal Pilot dolomite in the Pioneer well contains only a few thin calcite-pyrite veinlets devoid of fluid inclusions. Moreover, the Yankee calcite veins have the same light-stable-isotope signatures as hydrothermal carbonate veins near or elsewhere in the Alligator Ridge district. These relationships imply that oil at Yankee migrated in the same hydrothermal system responsible for gold mineralization. Such systems elsewhere in the eastern Basin and Range, given favorable source rocks, traps, seals, and migratory pathways, might well have formed not only gold deposits, but also rich, spatially coincident oil reservoirs.

Pinnell, M.L. (Pioneer Oil and Gas, Midvale, UT (United States)); Hulen, J.B. (Univ. of Utah Research Institute, Salt Lake City, UT (United States)); Cox, J.W. (USMX, Reno, NV (United States))

1993-08-01T23:59:59.000Z

313

An extremely wide and very low-mass pair with common proper motion. Is it representative of a nearby halo stream?  

E-Print Network (OSTI)

(abridged) We describe the discovery of an extremely wide pair of low-mass stars with a common large proper motion and discuss their possible membership in a Galactic halo stream crossing the Solar neighbourhood. (...) The late-type (M7) dwarf SSSPM J2003$-$4433 and the ultracool subdwarf SSSPM J1930$-$4311 (sdM7) sharing the same very large proper motion of about 860 mas/yr were found in the same sky region with an angular separation of about 6\\degr. From the comparison with other high proper motion catalogues we have estimated the probability of a chance alignment of the two new large proper motions to be less than 0.3%. From the individually estimated spectroscopic distances of about $38^{+10}_{-7}$ pc and $72^{+21}_{-16}$ pc, respectively for the M7 dwarf and the sdM7 subdwarf, and in view of the accurate agreement in their large proper motions we assume a common distance of about 50 pc and a projected physical separation of about 5 pc. The mean heliocentric space velocity of the pair $(U,V,W)=(-232, -170, +74)$ km/s, based on the correctness of the preliminary radial velocity measurement for only one of the components and on the assumption of a common distance and velocity vector, is typical of the Galactic halo population. The large separation and the different metallicities of dwarfs and subdwarfs make a common formation scenario as a wide binary (later disrupted) improbable, although there remains some uncertainty in the spectroscopic classification scheme of ultracool dwarfs/subdwarfs so that a dissolved binary origin cannot be fully ruled out yet. It seems more likely that this wide pair is part of an old halo stream. (...)

R. -D. Scholz; N. V. Kharchenko; N. Lodieu; M. J. McCaughrean

2008-07-03T23:59:59.000Z

314

An extremely wide and very low-mass pair with common proper motion. Is it representative of a nearby halo stream?  

E-Print Network (OSTI)

(abridged) We describe the discovery of an extremely wide pair of low-mass stars with a common large proper motion and discuss their possible membership in a Galactic halo stream crossing the Solar neighbourhood. (...) The late-type (M7) dwarf SSSPM J2003$-$4433 and the ultracool subdwarf SSSPM J1930$-$4311 (sdM7) sharing the same very large proper motion of about 860 mas/yr were found in the same sky region with an angular separation of about 6\\degr. From the comparison with other high proper motion catalogues we have estimated the probability of a chance alignment of the two new large proper motions to be less than 0.3%. From the individually estimated spectroscopic distances of about $38^{+10}_{-7}$ pc and $72^{+21}_{-16}$ pc, respectively for the M7 dwarf and the sdM7 subdwarf, and in view of the accurate agreement in their large proper motions we assume a common distance of about 50 pc and a projected physical separation of about 5 pc. The mean heliocentric space velocity of the pair $(U,V,W)=(-232, -170...

Scholz, R -D; Lodieu, N; McCaughrean, M J

2008-01-01T23:59:59.000Z

315

Development of a Novel Efficient Solid-Oxide Hybrid for Co-generation of Hydrogen and Electricity Using Nearby Resources for Local Application  

DOE Green Energy (OSTI)

Developing safe, reliable, cost-effective, and efficient hydrogen-electricity co-generation systems is an important step in the quest for national energy security and minimized reliance on foreign oil. This project aimed to, through materials research, develop a cost-effective advanced technology cogenerating hydrogen and electricity directly from distributed natural gas and/or coal-derived fuels. This advanced technology was built upon a novel hybrid module composed of solid-oxide fuel-assisted electrolysis cells (SOFECs) and solid-oxide fuel cells (SOFCs), both of which were in planar, anode-supported designs. A SOFEC is an electrochemical device, in which an oxidizable fuel and steam are fed to the anode and cathode, respectively. Steam on the cathode is split into oxygen ions that are transported through an oxygen ion-conducting electrolyte (i.e. YSZ) to oxidize the anode fuel. The dissociated hydrogen and residual steam are exhausted from the SOFEC cathode and then separated by condensation of the steam to produce pure hydrogen. The rationale was that in such an approach fuel provides a chemical potential replacing the external power conventionally used to drive electrolysis cells (i.e. solid oxide electrolysis cells). A SOFC is similar to the SOFEC by replacing cathode steam with air for power generation. To fulfill the cogeneration objective, a hybrid module comprising reversible SOFEC stacks and SOFC stacks was designed that planar SOFECs and SOFCs were manifolded in such a way that the anodes of both the SOFCs and the SOFECs were fed the same fuel, (i.e. natural gas or coal-derived fuel). Hydrogen was produced by SOFECs and electricity was generated by SOFCs within the same hybrid system. A stand-alone 5 kW system comprising three SOFEC-SOFC hybrid modules and three dedicated SOFC stacks, balance-of-plant components (including a tailgas-fired steam generator and tailgas-fired process heaters), and electronic controls was designed, though an overall integrated system assembly was not completed because of limited resources. An inexpensive metallic interconnects fabrication process was developed in-house. BOP components were fabricated and evaluated under the forecasted operating conditions. Proof-of-concept demonstration of cogenerating hydrogen and electricity was performed, and demonstrated SOFEC operational stability over 360 hours with no significant degradation. Cost analysis was performed for providing an economic assessment of the cost of hydrogen production using the targeted hybrid technology, and for guiding future research and development.

Tao, Greg, G.; Virkar, Anil, V.; Bandopadhyay, Sukumar; Thangamani, Nithyanantham; Anderson, Harlan, U.; Brow, Richard, K.

2009-06-30T23:59:59.000Z

316

The Brown Dwarf Kinematics Project (BDKP). II. Details on Nine Wide Common Proper Motion Very Low–Mass 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.

317

The City Recycled: The Afterlives of Demolished Buildings in Postwar Beijing  

E-Print Network (OSTI)

Often 30 meters tall, these gate towers were made of wood,tall, and 12 meters thick at ground level. Along the City Wall there were 15 gate towers,

Kao, Shih-yang

2013-01-01T23:59:59.000Z

318

Sun, wind, and pedestrian comfort: a study of Toronto's Central Area  

E-Print Network (OSTI)

the north, with a tall, 46m-high tower along Shuter Street.tall enough, cast shadows on streets that are located to the north of such a tower,

Bosselmann, P.; Arens, Edward A; Dunker, K.; Wright, R.

1990-01-01T23:59:59.000Z

319

Separation Processes, Second Edition  

E-Print Network (OSTI)

the far left background. The tall tower at the right is theeither phase, provided the tower is tall enough. The partialtall structure at the left is the flue stack for a furnace preheating the feed to the distillation towers.

King, C. Judson

1980-01-01T23:59:59.000Z

320

Refining Crude Oil - Energy Explained, Your Guide To Understanding ...  

U.S. Energy Information Administration (EIA)

The resulting liquids and vapors are discharged into distillation towers. ... horizontal vessels and tall, skinny towers that loom above other ...

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

A SUMMARY OF TEST OBSERVATIONS WHEN IBUTTONS ARE SUBJECTED TO RF ENERGY  

SciTech Connect

The iButton is a 'one-wire', temperature sensor and data logger in a short metal cylinder package 17 mm in diameter and 6 mm tall. The device is designed to be attached to a surface and acquire temperature samples over time periods as short as 1 second to as long as 300 minutes. Both 8-bit and 16-bit samples are available with 8kB of memory available. Lifetime is limited to an internal battery that cannot be replaced or recharged. The RF test interest originated with the concern that the data logger could inadvertently record electrical emanations from other nearby equipment. The normal operation of the data logger does not support high speed sampling but the control interface will operate at either 15.4 kbps or 125 kbps. There were no observable effects in the operation of the module or in the data that could be attributed to the use of RF energy. They made the assumption that these devices would potentially show RF sensitivity in any of the registers and in the data memory equally, therefore gross changes in the data might show RF susceptibility. No such sensitivity was observed. Because significant power levels were used for these tests they can extrapolate downward in power to state that no RF susceptibility would occur at lower power levels given the same configurations.

Kane, R J; Baluyot, E V

2011-10-26T23:59:59.000Z

322

Building and Fire Publications  

Science Conference Proceedings (OSTI)

... Jones, WW; Peacock, RD; Forney, GP; Reneke, PA; Cooling Mode Fault ... Conference (IAQVEC 2004) and Multipurpose High-Rise Towers and Tall ...

323

Building and Fire Publications  

Science Conference Proceedings (OSTI)

... 5th International Conference (IAQVEC 2004) and Multipurpose High-Rise Towers and Tall ... KM; Junker, V. Use of Water Spray Cooling Systems in ...

324

Prairie Forbes Key  

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

smell very mint-like, 1 to 3 feet tall...Mountain mint, Pycnanthemum virginranum 4(2') Leaves that are long, thick, yucca-like,...

325

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

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

Cumberland County, PA PA Energy Harvest Mined Project Grants - Mains Dairy Farm Biogas Project Install an anaerobic digester (12' diameter, 35' tall) to improve manure...

326

NIST World Trade Center Investigation Team Calls for ...  

Science Conference Proceedings (OSTI)

... The standards for estimating the load effects of ... prototype structures and estimating wind loads for tall ... spaces and higher threat profiles of particular ...

2012-11-20T23:59:59.000Z

327

Wind Shear and Resources at Elevated Heights: Indiana and Iowa Case Studies (Poster)  

DOE Green Energy (OSTI)

This poster discusses the results of an analysis of wind shear and resource characteristics data collected by tall towers in Indiana and Iowa.

Elliott, D.; Schwartz, M.; Scott, G.

2008-06-01T23:59:59.000Z

328

Ninety-Nine-Year Sediment Yield Record of the Middle Cuyahoga River Watershed Contained Within the Ohio Edison Dam Pool.  

E-Print Network (OSTI)

??The 17.4 m tall Ohio Edison Dam was constructed in 1912 on the Cuyahoga River near the city of Akron, Ohio. The dam was installed… (more)

Mann, Kristofer Clayton

2012-01-01T23:59:59.000Z

329

Penetration of fire partitions by plastic pipe - Springer  

Science Conference Proceedings (OSTI)

assembly was mounted in one end of the inner chamber, while the other end ...... G. T., 'Computer Analysis of Smoke Movement in Tall Buildings," ASHRAE.

330

CONTAM Libraries - Appendix C4: Miscellaneous Commercial ...  

Science Conference Proceedings (OSTI)

... 1976. "Studies on Exterior Wall Air Tightness and Air Infiltration of Tall Buildings," ASHRAE Transactions, Vol. 82, Part 1, 122-134. C10. ...

331

Dynamic Soil-Structure Interaction of Instrumented Buildings and Test Structures  

E-Print Network (OSTI)

structure interaction in buildings. I: Analytical aspects,structure interaction in buildings. II: Empirical findings,New York PEER, 2010. Tall Buildings Initiative, Guidelines

Givens, Michael James

2013-01-01T23:59:59.000Z

332

NIST Manuscript Publication Search  

Science Conference Proceedings (OSTI)

... collapse sequence for each tower; the conduct of ... methods for fire resistance design of structures ... structural collapse; tall buildings; wind engineering. ...

2005-09-01T23:59:59.000Z

333

RETHINKING EGRESS: A VISION FOR THE FUTURE ...  

Science Conference Proceedings (OSTI)

... Certain commercial entities, equipment, or materials may ... engineer in those terms: intensity, duration, location ... of a tall building's energy usage and ...

2012-11-01T23:59:59.000Z

334

Biomass Resources | Department of Energy  

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

as switchgrass, miscanthus (also known as elephant grass or e-grass), bamboo, sweet sorghum, tall fescue, kochia, wheatgrass, and others. Short-rotation woody crops are...

335

A Lighthouse.  

E-Print Network (OSTI)

??This lighthouse is a visual anchor from land and sea. Its three concrete towers reach 250 feet tall with a base diameter of 75 feet.… (more)

Weppler, Carly Patricia

2012-01-01T23:59:59.000Z

336

2011 NERSC NISE Awards Summary Table  

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

superhalogens Michael Kaplan, Desert Research Institute m965 750,000 BER Climate Research Tall Tower Wind Energy Monitoring and Numerical Model Validation in Southern Nevada Noel...

337

about Savannah River National Laboratory  

Tall Tower measurements and numerous other portable samplers placed in the plume path. A high resolution numerical simulation was then executed to provide a three ...

338

Minnesota | Department of Energy  

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

with Wind Power University of Minnesota's new Clipper Liberty wind turbine and 426-foot tall meteorological tower will allow researchers to work on improving wind turbine...

339

Design of Complex Systems to Achieve Passive Safety: Natural Circulation Cooling of Liquid Salt Pebble Bed Reactors  

E-Print Network (OSTI)

buildings cool. Minarets are tall towers with windows at thetall N ATURAL C IRCULATION - I NTEGRAL E FFECTS T ESTS towers,

Scarlat, Raluca Olga

2012-01-01T23:59:59.000Z

340

NERSC Initiative for Scientific Exploration (NISE) 2011 Awards  

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

in Key U.S. Soils using "omics" Semiclassical Approaches for Clean Energy Resources Tall Tower Wind Energy Monitoring and Numerical Model Validation in Southern Nevada...

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


341

CX-008401: Categorical Exclusion Determination | Department of...  

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

of specialized personnel and equipment in order to dismantle the approximately 60-foot tall metal lattice communications tower from privately owned land and remove it to a BOR...

342

Nevada | Department of Energy  

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

Improve Grid Reliability February 14, 2011 CX-005201: Categorical Exclusion Determination Tall Tower Wind Energy Monitoring and Numerical Model Validation in Southern Nevada CX(s)...

343

Comparison of Fatigue and Fracture Properties of Nb- and V ...  

Science Conference Proceedings (OSTI)

In structural applications that are exposed to the environment,? ?such as bridges,? ? wind towers,? ?power transmission towers,? ?even tall buildings,? ?good fatigue ...

344

Out of Ashes and Rubble: The Pirelli Tower  

E-Print Network (OSTI)

tower was novel, experimental architecture because it was the first skyscraper to be built in Italy; it was an extremely tall

Ziegler, Claudia J.

2009-01-01T23:59:59.000Z

345

Enhancement of CN Tower lightning current derivative signals using a modified power spectral subtraction method.  

E-Print Network (OSTI)

??Lightning current measurements are possible using instrumental tall structures or rocket-triggered lightning. The CN Tower has been a source of lightning current data for the… (more)

Mehmud, Huma

2006-01-01T23:59:59.000Z

346

ENVIRONMENTAL REVIEW FOR CATEGORICAL EXCLUSION DETERMINATION  

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

of specialized personnel and equipment in order to dismantle the approximately 60-foot tall metal lattice communications tower from privately owned land and remove it to a BOR...

347

Flux Measurements of Volatile Organic Compounds from an Urban Tower Platform.  

E-Print Network (OSTI)

??A tall tower flux measurement setup was established in metropolitan Houston, Texas, to measure trace gas fluxes from both anthropogenic and biogenic emission sources in… (more)

Park, Chang Hyoun

2011-01-01T23:59:59.000Z

348

Scott Smith | BNL  

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

for the ground and rooftop stations, this included two Mini SODARs May 2009: Ameriflux Tall Tower Test. The lead BNL representative for the tracer release units for 2...

349

Evaluation of icing design criteria for lattice towers.  

E-Print Network (OSTI)

??Atmospheric icing is a major design factor for guyed lattice masts and transmission lines in Canada and many others countries with cold climate. Tall and… (more)

Korotkov, Oleksiy

2010-01-01T23:59:59.000Z

350

Microsoft Word - Anaconda-Sub-3G-CX.doc  

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

at the existing BPA Anaconda Substation in Deer Lodge County, Montana. The monopole tower would be about 30 feet tall and would be installed within the gravel substation...

351

Distributed Energy Systems in California's Future: A Preliminary Report Volume 2  

E-Print Network (OSTI)

on a tall (approximately 110 meters) tower. generation oftall stacks and plumes of particulates, and through the large cooling o u 'd U towers

Balderston, F.

2010-01-01T23:59:59.000Z

352

Comparison Testing of Simulated Data Processing/Telecomm ...  

Science Conference Proceedings (OSTI)

... 10 Page 11. Table 2. Strength of Walls. Exterior Wall, 10 Feet Tall [5] Wall Type Maximum Allowable Pressure (psf) ... 90 6” masonry reinforced 41 ...

2011-10-13T23:59:59.000Z

353

Oak Ridge Leadership Computing Facility Annual Report 20102011  

E-Print Network (OSTI)

, a process that poses a significant obstacle to economically viable bioethanol production. Simulation

354

Topic: Robotics  

Science Conference Proceedings (OSTI)

... NIST Workshop Seeks Manufacturers' Ideas on Using Multipurpose Robots. ... Mobile Autonomous Vehicle Obstacle Detection and Avoidance. ...

2012-09-19T23:59:59.000Z

355

K-State Turfgrass Research 2005, Report of Progress 946 TITLE: Comparison of the heat and drought tolerances of a Texas bluegrass  

E-Print Network (OSTI)

tolerances of a Texas bluegrass hybrid compared with Kentucky bluegrass and tall fescue: A growth chamber in a Texas bluegrass hybrid (Thermal Blue), Kentucky bluegrass (Apollo), and tall fescue (Dynasty); 2 superintendents prefer the finer texture that Kentucky bluegrass offers. New Texas bluegrass (Poa arachnifera Torr

356

Active Turbulence and Scalar Transport near the Forest–Atmosphere Interface  

Science Conference Proceedings (OSTI)

Turbulent velocity, temperature, water vapor concentration, and other scalars were measured at the canopy–atmosphere interface of a 13–14-m-tall uniform pine forest and a 33-m-tall nonuniform hardwood forest. These measurements were used to ...

Gabriel G. Katul; Chris D. Geron; Cheng-I. Hsieh; Brani Vidakovic; Alex B. Guenther

1998-12-01T23:59:59.000Z

357

New Meteorlogical Data for Ventsar XL  

SciTech Connect

Every five years Savannah River National Laboratory (SRNL) generates an updated meteorological database to facilitate dosimetric calculations of accident and routine release scenarios for onsite and offsite populations. This information becomes the input of various environmental dosimetry codes run by the Environmental Dosimetry Group (EDG) at SRNL. The three most recent databases prior to the current one were completed for the time periods 1987-1991, 1992-1996, and 1997-2001. The current database covers the period 2002-2006. This study represents a portion of a larger study to compare the meteorological data among these four five-year periods and focuses on updating VENTSAR XL{copyright} for the current meteorological database. The updated meteorological data are also applied in other dosimetry models approved for risk and dose assessment at Savannah River Site (SRS). VENTSAR XL{copyright} is a Gaussian Plume model that includes building effects and plume rise. The typical input involves the location of the release, building dimensions, distance to the building, release height, vent diameter, vent gas temperature, gas molecular weight, ambient air temperature, breathing rate, meteorological conditions, radionuclides and their amount released. The output is easily converted into tables and graphs for further analysis and shows the concentrations and pathway doses for each of the incremental downwind distances. VENTSAR XL{copyright} has been used at SRS to investigate building effects such as reactor cooling towers in support of safety analyses. VENTSAR XL{copyright} has also been applied to Good Engineering Practice (GEP) stack height evaluations for various projects at SRS. In accordance with the Clean Air Act Amendments of 1977, GEP must be used in determining the height of any stack that will be used to disperse routine emissions. With respect to stack heights, the GEP height is 'the height necessary to ensure that emissions from the stack do not result in excessive concentrations of any air pollutant in the immediate vicinity of the source as a result of atmospheric downwash, eddies and wakes which may be created by the source itself, nearby structures or nearby terrain obstacles.' The EPA has set specific criteria to determine if a stack is of the acceptable height. These criteria have been used to determine a GEP stack height for several emission assessments at SRS. The EPA documents contain detailed information on how the height of a stack is determined. The general rule for stack height determination is to make the stack at least 2 1/2 times the height of nearby buildings. This estimated height can be increased or decreased based on other factors such as plume rise, downwash, and building wake effects.

T. Foley; Jannik, T.

2010-06-13T23:59:59.000Z

358

The Value of Renewable Energy as a Hedge Against Fuel Price Risk: Analytic Contributions from Economic and Finance Theory  

E-Print Network (OSTI)

Daily price history of 1st-nearby NYMEX natural gas futureshistory of the “first-nearby” (i.e. , closest to expiration) NYMEX natural gas

Bolinger, Mark A

2009-01-01T23:59:59.000Z

359

Child Care Availability and Usage Among Welfare Recipients  

E-Print Network (OSTI)

Child Care Availability and Usage Among Welfare Recipients 1the impact that the availability of nearby licensed care hasemployment and that the availability of nearby licensed care

Houston, Douglas; Ong, Paul M.

2003-01-01T23:59:59.000Z

360

Risř–I–1206(EN) Wind Power Meteorology  

E-Print Network (OSTI)

Abstract Wind power meteorology has evolved as an applied science, firmly founded on boundary-layer meteorology, but with strong links to climatology and geography. It concerns itself with three main areas: siting of wind turbines, regional wind resource assessment, and short-term prediction of the wind resource. The history, status and perspectives of wind power meteorology are presented, with emphasis on physical considerations and on its practical application. Following a global view of the wind resource, the elements of boundary layer meteorology which are most important for wind energy are reviewed: wind profiles and shear, turbulence and gust, and extreme winds. The data used in wind power meteorology stem mainly from three sources: onsite wind measurements, the synoptic networks, and the re-analysis projects. Wind climate analysis, wind resource estimation and siting further require a detailed description of the topography of the terrain – with respect to the roughness of the surface, near-by obstacles, and orographical features. Finally, the meteorological models used for estimation and prediction of the wind are described; their classification,

Erik L. Petersen; Niels G. Mortensen; Lars L; Jřrgen Hřjstrup; Helmut P. Frank

1997-01-01T23:59:59.000Z

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.
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361

Modeling needs for very large systems.  

Science Conference Proceedings (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

362

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

363

ALMA: Exploring theALMA: Exploring the Outer Limits ofOuter Limits of  

E-Print Network (OSTI)

Z Machines ALMA: Exploring theALMA: Exploring the Outer Limits ofOuter Limits of Redshift Field Rich in Nearby Galaxies, Poor in Distant Galaxies Nearby galaxies in HDF Source: K. Lanzetta, SUNY-SB Distant galaxies in HDF #12;ALMA Deep Field Poor in Nearby Galaxies, Rich in Distant Galaxies Nearby

Groppi, Christopher

364

Towards a Wind Energy Climatology at Advanced Turbine Hub-Heights: Preprint  

DOE Green Energy (OSTI)

Measurements of wind characteristics over a wide range of heights up to and above 100 m are useful to: (1) characterize the local and regional wind climate; (2) validate wind resource estimates derived from numerical models; and (3) evaluate changes in wind characteristics and wind shear over the area swept by the blades. Developing wind climatology at advanced turbine hub heights for the United States benefits wind energy development. Tall tower data from Kansas, Indiana, and Minnesota (which have the greatest number of tall towers with measurement data) will be the focus of this paper. Analyses of data from the tall towers will start the process of developing a comprehensive climatology.

Schwartz, M.; Elliott, D.

2005-05-01T23:59:59.000Z

365

Flow over Heated Terrain. Part I: Linear Theory and Idealized Numerical Simulations  

Science Conference Proceedings (OSTI)

The flow past heated topography is examined with both linear and nonlinear models. It is first shown that the forcing of an obstacle with horizontally homogenous surface heating can be approximated by the forcing of an obstacle with surface ...

N. Andrew Crook; Donna F. Tucker

2005-09-01T23:59:59.000Z

366

The Denver Cyclone. Part II: Interaction with the Convective Boundary Layer  

Science Conference Proceedings (OSTI)

The effect of surface heating on the flow past an isolated obstacle is examined with the aid of a nonlinear numerical model. These simulations extend the results of Part I, which considered the adiabatic, stratified flow around the obstacle. When ...

N. Andrew Crook; Terry L. Clark; Mitchell W. Moncrieff

1991-10-01T23:59:59.000Z

367

An Experimental and Numerical Study of the Internal Wave Generation by Tide—Topography Interaction  

Science Conference Proceedings (OSTI)

A stratified fluid response to barotropic oscillatory now over a large-amplitude obstacle is examined on the basis of the results of laboratory and numerical experiments. It is demonstrated that, when the obstacle height is fixed relative to the ...

Tomonori Matsuura; Toshiyuki Hibiya

1990-04-01T23:59:59.000Z

368

Applications of a 3D Range Camera Towards Healthcare ...  

Science Conference Proceedings (OSTI)

... The NIST Healthcare Mobility Project has recently ... obstacles are then projected and accumulated ... The Manhattan distance (distance between two ...

2012-10-24T23:59:59.000Z

369

Characterization of Mechanical Property Variation across an Inertia ...  

Science Conference Proceedings (OSTI)

Development of High Temperature Steels for Advanced Ultrasupercritical Steam Turbines · Dislocation Glide through Non-randomly Distributed Point Obstacles.

370

Estimating Plume Dispersion-A Comparison of Several Sigma Schemes  

Science Conference Proceedings (OSTI)

The lateral and vertical Gaussian plume dispersion parameters are estimated and compared with fieldtracer data collected at II sites. The dispersion parameter schemes used in this analysis include Cramer'sscheme, suggested for tall stack ...

John S. Irwin

1983-01-01T23:59:59.000Z

371

The Prairie - Our Heartland Sampler  

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

was Illinois like 200 years ago? Illinois, called the "Prairie State," was once covered by 40,000 square miles of tall grass prairie. This ecosystem was home to grasses, forbs and...

372

Do Higher State Test Scores In Texas Make For Better High School Outcomes?  

E-Print Network (OSTI)

Colvin, Richard Lee. 1999. ““Texas Schools Gain Notice andFlo. 2000. ““Tall Tales? Texas Testing Moves from the Pecosin North Carolina and Texas. ”” Washington, D.C. : National

Carnoy, Martin; Loeb, Susanna; Smith, Tiffany L.

2000-01-01T23:59:59.000Z

373

Power Tower Systems for Concentrating Solar Power  

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

In power tower concentrating solar power systems, numerous large, flat, sun-tracking mirrors, known as heliostats, focus sunlight onto a receiver at the top of a tall tower. A heat-transfer fluid...

374

Proceedings of NAACL HLT 2009: Short Papers, pages 4144, Boulder, Colorado, June 2009. c 2009 Association for Computational Linguistics  

E-Print Network (OSTI)

of A's, C's, G's, T's. This has led to the necessary marriage of biology and computer science mated pea plants with different pairs of traits---round vs. wrinkled seeds, tall or dwarf plants, white

375

The Persimmon  

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

Basin and there are records of persimmon trees in the bottomland forests of the Wabash valley which were more than 100 feet tall and 2 feet in diameter. Ordinarily, however, it...

376

Nongeostrophic Baroclinic Instability in a Two-Fluid Layer Rotating System  

Science Conference Proceedings (OSTI)

The interfacial stability of two differentially rotating fluid layers in a tall, right circular cylinder is investigated analytically and experimentally. The differential speeds are such that the Ekman and Rossby numbers of the flow are small. A ...

J. Bradford; A. S. Berman; T. S. Lundgren

1981-07-01T23:59:59.000Z

377

NIST: A Walk Through Time - Early Clocks  

Science Conference Proceedings (OSTI)

... One of the most elaborate clock towers was built by Su Sung and his ... The Su Sung clock tower, over 30 feet tall, possessed a bronze power-driven ...

2010-10-05T23:59:59.000Z

378

Massachusetts | Department of Energy  

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

30, 2010 Seven-foot tall cylinders equipped with flywheel technology (shown above) will make up Beacon Power's energy storage plant in Stephentown, N.Y. The company received a 43...

379

The Effect of Building Shadows on the Vertical Temperature Structure of the Lower Atmosphere in Downtown Denver  

Science Conference Proceedings (OSTI)

Denver's Continuous Air Monitoring Program (CAMP) site, typically recording the highest carbon monoxide levels in the metropolitan area; lies within a large region of downtown Denver shadowed by tall buildings. Two studies conducted during the ...

Dominique Ruffieux; Daniel E. Wolfe; Catherine Russell

1990-12-01T23:59:59.000Z

380

Heat Pump Water Heaters | Department of Energy  

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

Water Heaters Heat Pump Water Heaters August 19, 2013 - 2:59pm Addthis Illustration of a heat pump water heater, which looks like a tall cylinder with a small chamber on top and 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.


381

Broomcorn and Broom Making  

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

for dusting his beaver hat. Next spring he planted that seed and it grew into a tall corn- like plant with a flowering brush of stiff fibers bearing seeds. From these more were...

382

Better Buildings Partners: Seattle, Washington  

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

a Community-Wide Venture Photo of the Seattle city skyline, with a variety of tall buildings clustered together. An image of a map of the United States with the state for this...

383

24834_OH_JGI_Factsheet_v1_r3  

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

the three DOE Bioenergy Research Centers: JBEI, BESC, and GLBRC. Facts about Poplars Poplar trees can be found around the world and are known for their ability to grow very tall...

384

Page not found | Department of Energy  

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

would include a 30,000-square-foot (2,700-square-meter) facility, a garage, a 130-car parking lot, and a 150-foot (45-meter) tall fire suppression water storage tank with antenna...

385

Power Tower Systems for Concentrating Solar Power | Department...  

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

known as heliostats, focus sunlight onto a receiver at the top of a tall tower. A heat-transfer fluid heated in the receiver is used to generate steam, which, in turn, is...

386

Discouraging Geese  

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

how big is the lawn, how close to what kind of water, etc. Simplest - get an aggressive dog. More complicated and maybe not possible for you, encourage tall dense vegetation,...

387

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

388

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

389

ARM - Field Campaign - Surface spectral albedo  

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

15. Mostly clear-sky. Measurement were made at the following locations a) Milo (grain sorghum) field. b) Bare soil. c) Tall grass. d) Short grass. e) Bare soil. f) Young green...

390

A 6-yr Climatology of Fronts Affecting Helsinki, Finland, and Their Boundary Layer Structure  

Science Conference Proceedings (OSTI)

A 6-yr climatology of the frequency, characteristics, and boundary layer structure of synoptic-scale fronts in Helsinki, Finland, was created using significant weather charts and observations from a 327-m-tall mast and from the Station for ...

Victoria A. Sinclair

2013-09-01T23:59:59.000Z

391

Hybrid Plume Dispersion Model (HPDM) Development and Evaluation  

Science Conference Proceedings (OSTI)

The Hybrid Plume Dispersion Model (HPDM) was developed for application to tall stack plumes dispersing over nearly flat terrain. Emphasis is on convective and high-wind conditions. The meteorological component is based on observational and ...

Steven R. Hanna; Robert J. Paine

1989-03-01T23:59:59.000Z

392

Ice Loads on a Lattice Tower Estimated by Weather Station Data  

Science Conference Proceedings (OSTI)

Atmospheric ice loads are a major design criterion of tall structures in cold regions. In this paper the possibility to derive the design ice loads using analysis of meteorological observations made routinely at a weather station is studied. Ice ...

Eva Sundin; Lasse Makkonen

1998-05-01T23:59:59.000Z

393

NREL: Sustainable NREL - South Entrance Building  

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

entrance. Energy Efficiency Features Daylighting Natural ventilation, including a 35-foot tall wind-catch tower and under-floor air distribution system Roof-mounted PV (15.8 kW)...

394

ARM TR-008  

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

C.L. Zhao, W. Ussler, and E. Quesnell. 1995. Measurements of carbon dioxide on a very tall tower. Tellus Series B-Chemical and Physical Meteorology, V47(N5):535-549. Bakwin,...

395

An investigation into the contribution of the low-level jet (LLJ) to the available wind resource in Missouri .  

E-Print Network (OSTI)

??This work uses data (1 September 2006-31 August 2007) from a network of tall-towers to investigate the impact of the nocturnal low-level jet (LLJ) on… (more)

Koleiny, Ali

2009-01-01T23:59:59.000Z

396

Instability Analysis of Terrain-Induced Canopy Flows  

Science Conference Proceedings (OSTI)

Tall vegetation and complex terrain create difficult conditions for measuring and modeling net ecosystem–atmosphere exchanges of carbon, water vapor, and pollutants. The instability of canopy flow regimes over complex terrain is critical for ...

Chuixiang Yi

2009-07-01T23:59:59.000Z

397

DOE - Safety of Radioactive Material Transportation  

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

sandstone blocks and limestone facing (mostly missing), Pyramid of Khufu (largest) is as tall as a 50-story building 3200 BC, Egypt Brooklyn Bridge Steel cable and masonry piers,...

398

A computational approach to the design of free form diagrid structure  

E-Print Network (OSTI)

In order to satisfy the ever-increasing complexity of modem architectural design of tall towers, diagrid structural systems are becoming more relevant. To deal with irregular geometries, more sophisticated computational ...

Sundberg, Jessica Nicole

2009-01-01T23:59:59.000Z

399

DOE Response to Wyoming Game and Fish Department on Draft Clipper...  

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

data standards that are required for this project. In addition, the tower must be 240 ft tall, and a guyed-lattice tower is the only practical and reasonable method that can be...

400

LESC-PESC SCiEnCE PoSition PaPEr  

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

grasslands), relatively more small- to medium-sized (20 m) rings are needed. For tall-stature vegetation (e.g. forests) there will be a trade- off between plot size and...

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

Microsoft Word - Appendix Cover Sheets  

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

of IL Rt. 2 and Sauk Road, in Dixon, Illinois. The 2.5 megawatt turbine will be 418 feet tall. The project will require a gravel access road, and electrical transmission...

402

Reflections on the Founding: Wurster Hall and The College of Environmental Design [Two Place Tales  

E-Print Network (OSTI)

tall buildings inevitable, the campus skyline became an issue. Locating high-rise buildings or towertall building that would mark the gateway to this newly important area. Wurster strongly favored the tower

Woodbridge, Sally

1984-01-01T23:59:59.000Z

403

In a mining accident, first responders are working against  

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

- Nickel Metal Hydride (w 4hr minimum battery life) * 4ft x 2ft footprint * 2ft tall at tower * Integrated fiber optic interface Contact Information robotics@sandia.gov...

404

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

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

(T13N R34E SEC14) The proposed work at this site includes installing a 150-foot tall radio tower and antenna system, 10x25-foot communications building, 10x15-foot...

405

INDIANAPOLIS AMUSEMENT PARKS, 1903-1911: LANDSCAPES ON THE EDGE.  

E-Print Network (OSTI)

??In May 1906, Wonderland Amusement Park opened its gates on East Washington Street in Indianapolis to reveal its 125-foot tall “Electric Tower,” a tree-top “Scenic… (more)

Zeigler, Connie J.

2007-01-01T23:59:59.000Z

406

Wind power systems in the stable nocturnal boundary layer.  

E-Print Network (OSTI)

??Hourly-averaged tall-tower data from a 200m tower located near Lubbock, Texas are used to examine static atmospheric stability as a governor of speed and direction… (more)

Walter, Kevin Robert

2007-01-01T23:59:59.000Z

407

Regional Estimates of Net Ecosystem-Atmosphere Exchange of Carbon Dioxide over a Heterogeneous Ecosystem.  

E-Print Network (OSTI)

??The net ecosystem-atmosphere exchange of CO2 (NEE) is estimated over a mixed forest ecosystem in the 40×40km2 region centered at the WLEF tall tower in… (more)

Wang, Weiguo

2005-01-01T23:59:59.000Z

408

Cuyahoga County Fairgrounds Wind Turbine Project Turbine Visualization...  

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

Conserve First LLC Attachment 1, Appendix C Page 20 of 28 Other Local Towers (Also See Tall Tower Tables Below) Appendix B Attachment B1 Copyright 2010: Conserve First LLC...

409

DOE Response to U.S. Fish and Wildlife Service Comments on Clipper...  

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

Phase.paragraph4. The DEA statesthat the proposed lattice-type meteorological tower will be 240 feet tall and will be supported by three setsof guy wires. The Service...

410

AVIAN AND BAT SCREENING ANALYSIS AND HABITAT CHARACTERIZATION  

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

results in the lowest mortality rate (The Ornithological Council 2007). The proposed MET tower would be 130 meters (426 feet) tall, with a tubular structure and guy wires. This...

411

Clouds  

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

heated by the sun, produces rising columns of air in which the moisture condenses into tall fleecy white clouds At night, when the sky is clear, the earth cools to give those...

412

Use of a Large Crane for Wind and Tracer Profiles in an Urban Setting  

Science Conference Proceedings (OSTI)

Although measured vertical profiles of wind, turbulence, and tracer concentrations are critical for understanding the urban boundary layer, it is problematic to field a sounding system or a tall structure to support anemometers in a densely ...

Frank J. Gouveia; Martin J. Leach; Joseph H. Shinn; William E. Ralph

2007-10-01T23:59:59.000Z

413

Multisensor Observation of an Atmospheric Undular Bore  

Science Conference Proceedings (OSTI)

A detailed and unique multisensor observation of an undular bore is presented. The data include those from rawinsonde, satellite, two Doppler radars, and a tall instrumented tower. Noteworthy are Doppler radar images that resolve the wave's ...

Pravas R. Mahapatra; Richard J. Doviak; Dusan S. Zrni?

1991-10-01T23:59:59.000Z

414

NREL: Wind Research - Dynamometer Test Facilities  

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

octagon-shaped, blue machine on a concrete platform inside a building. Three 8 to 12 foot tall step ladders have been set up around the base of the machines to provide workers...

415

APPENDIX B: VISUALIZATION, PHOTO ANALYSIS & SHADOW FLICKER ANALYSIS  

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

(155') Cell Tower Behind Indian Hills Drive Cell Tower Off of Washington Street (Also See Tall Tower Map and Tables Below) Appendix B Attachment B1 Copyright 2010: Conserve...

416

The Insect Orchestra  

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

each foreleg just below the "knee". Crickets thrive and sing when kept in a tall glass jar with a piece of sod in the bottom, and fed bits of bread. The life span of the adults...

417

EA-1376: Proposed Construction and Operation of a New Interagency...  

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

Center would include a 30,000-square-foot (2,700-square-meter) facility, a garage, a 130-car parking lot, and a 150-foot (45-meter) tall fire suppression water storage tank with...

418

Previous FY # $ # $ # $ # $ t d t  

E-Print Network (OSTI)

and Receptors $344,806.00 Biochem Total $344,806.00 Bellmer, D Biosys OK Bioenergy Center Bioethanol De System Task $800.00 Hickman, K NREM OK Dept of Transportation Conversion of Tall Fescue $0.00 McKinley, C of Transportation Conversion of Tall Fescue $71,566.00 NREM Total $71,566.00 Davis, C NREM/F&W US Fish & Wildlife

Balasundaram, Balabhaskar "Baski"

419

Use of a Geographic Mapping Tool in Power Line Routing for RF Hazard Identification: A Feasibility Evaluation  

Science Conference Proceedings (OSTI)

Radiofrequency (RF) fields induce currents and voltages on conductive objects with the general finding that larger or longer or taller objects, such as power lines and tall cranes, can result in greater currents and voltages. Medium wave frequencies (MF) associated with operation of AM radio broadcast stations are particularly prone to induction of RF voltages on long and/or tall cables that present the potential for arcing to ground or personnel who may initiate contact with the conductor. MF includes t...

2011-11-16T23:59:59.000Z

420

Table US14. Average Consumption by Energy End Uses, 2005 Million ...  

U.S. Energy Information Administration (EIA)

a climate zone according to the 30-year average annual degree-days for an appropriate nearby weather station.

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

CRS Report for Congress Prepared for Members and Committees of Congress  

E-Print Network (OSTI)

. Nearby Lake Magadi, a playa in the sump of the Kenyan rift valley is also promising. Earlier trona

422

Quaternary Science Reviews 23 (2004) 561580 Recent environmental change and prehistoric human activity in  

E-Print Network (OSTI)

. Nearby Lake Magadi, a playa in the sump of the Kenyan rift valley is also promising. Earlier trona

Nicoll, Kathleen

423

HIGH TEMPERATURE SUPERCONDUCTORS: V: BSCCO ...  

Science Conference Proceedings (OSTI)

Transport current properties in bias fields for the other magnet with the outer ... Two obstacles to high field Jc over long lengths are poor flux pinning and ...

424

Development of a gross motor task to assess motor planning of children with autism spectrum disorders.  

E-Print Network (OSTI)

??Motor planning was assessed by performance of 10 male children (age range 9-12 years) with ASD on a simple obstacle course of horizontal barriers. The… (more)

Staples, Kerri.

2005-01-01T23:59:59.000Z

425

BSCProgramDescriptionDocumentJan2005.doc  

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

performance, or obstacle to improvement. Once an assessment has been conducted, the organization shall brief the HCA, or DOE HQ as appropriate, describing any improvements to...

426

Promoting Symphony Sustainability: A Case Study of the Houston Symphony's The Planets - An HD Odyssey Film Project.  

E-Print Network (OSTI)

??US orchestras are faced with numerous obstacles as they strive to find sustainability, and many struggle to develop new programs that contribute to the orchestra's… (more)

Williams, Meredith F

2013-01-01T23:59:59.000Z

427

View  

E-Print Network (OSTI)

It models optimal placement of communications relay nodes in the pres- ence of obstacles. This problem ...... tion Technology (CENIIT). The authors would like to

428

Sensing and Perception Systems Group  

Science Conference Proceedings (OSTI)

... Mobile Autonomous Vehicle Obstacle Detection and Avoidance—Mobile equipment is heavily ... system under test so the two data streams can be ...

2012-08-30T23:59:59.000Z

429

Fuel Cell Technologies Office: Program Plans  

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

within the EERE Fuel Cell Technologies Office and the DOE offices of Nuclear Energy, Fossil Energy, and Science. It describes the Program's activities, the specific obstacles...

430

Stress Biased Magnetocaloric Effect  

Science Conference Proceedings (OSTI)

Lack of cost-effectiveness is the major obstacle limiting magnetocaloric refrigeration from wide industrial and commercial applications. Here, we show that a ...

431

Parents' perceptions about the health and well-being of farm schools / Leuba Alfred Mphahlele.  

E-Print Network (OSTI)

??Various research reports and articles in the popular press have highlighted the obstacles and negative conditions that learners experience at some farm schools in South… (more)

Mphahlele, Leuba Alfred

2008-01-01T23:59:59.000Z

432

From the Lab to the Showroom: How the Electric Car Came to Life...  

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

effectively addressed three of the major obstacles standing in the way of a mass produced electric vehicle: cost, lifespan and driving range. But the transition between lab...

433

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

434

Adoption| A Hero's Journey.  

E-Print Network (OSTI)

?? This thesis explores complex issues associated with adoption and being an adoptee. In their development, adoptees encounter more obstacles than nonadoptees in the areas… (more)

Craig, Kimberly

2012-01-01T23:59:59.000Z

435

Movements in air conditioning.  

E-Print Network (OSTI)

??Movements in Air Conditioning is a collection of poems that explores the obstacles inherent in creating a new sense of home in a country that… (more)

Hitt, Robert D. (Robert David)

2013-01-01T23:59:59.000Z

436

Success Stories: Solexant Nanocrystal Solar Cells  

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

Rolling Out Affordable Solar Energy The high cost of producing photovoltaic cells has been cited as the main obstacle in expanding solar energy's reach. Lawrence Berkeley National...

437

An automated reliable method for two-dimensional Reynolds-Averaged Navier-Stokes simulations  

E-Print Network (OSTI)

The development of computational fluid dynamics algorithms and increased computational resources have led to the ability to perform complex aerodynamic simulations. Obstacles remain which prevent autonomous and reliable ...

Modisette, James M

2011-01-01T23:59:59.000Z

438

Developmental Control  

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

Science Center. Lignin has been considered as a major obstacle for cellulosic biofuel production from switchgrass biomass. The purpose of this study was to provide...

439

Ultrasonic Computerized Tomography of Pipelines for Continuous ...  

Science Conference Proceedings (OSTI)

Commercial handheld thickness gauging devices require direct access to pipelines and find limited applications due to the presence of physical obstacles or the ...

440

Behavior and survival of fish migrating downstream in regulated rivers.  

E-Print Network (OSTI)

??Dams present obstacles to fish migrating between freshwater and marine habitats. This thesis evaluated downstream migrations of fish in five rivers in Sweden and North… (more)

Ferguson, John

2008-01-01T23:59:59.000Z

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


441

CX-006995: Categorical Exclusion Determination | Department of...  

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

Energy Overcome all major obstacles to the commercialization of the thermoelectric generator and demonstrate fuel economy improvement of 5% over the US06 drive cycle....

442

An Act to Implement the Recommendations of the Governor's Ocean Energy Task Force (Maine)  

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

This law was enacted to overcome economic, technical and regulatory obstacles and to provide economic incentives for vigorous and efficient development of promising indigenous, renewable ocean...

443

Microstructure Evolution: Modeling  

Science Conference Proceedings (OSTI)

Mar 1, 2011 ... The irradiation of nuclear reactor structural materials leads to the formation of .... Obstacles in Iron: Yury Osetskiy1; Roger Stoller1; 1ORNL

444

BERKELEY REVIEW OF LATIN AMERICAN STUDIES 18 Headwinds for Climate Change Policy  

E-Print Network (OSTI)

Reform. Mexico's petroleum monopoly, Pemex, presents another important obstacle. Asastrategyintendedtofightpoverty, Pemex keeps energy prices artificially low, thereby undercutting incentives to conserve

Kammen, Daniel M.

445

System for Recovering Waste Heat from High Temperature Molten ...  

Science Conference Proceedings (OSTI)

There are some shortages: poor effectiveness of granulation, high air-slag ratio and high energy consumption, which are the obstacles to popularize ...

446

2012 Carolina Challenge Underway | National Nuclear Security...  

National Nuclear Security Administration (NNSA)

of competition, to include: maneuvering safely through obstacles; shooting from unconventional firing positions; and rescuing downed officers. Posted on April 26, 2012 at 1:37...

447

Massively Parallel Molecular Statics Simulations of the Percolation ...  

Science Conference Proceedings (OSTI)

Presentation Title, Massively Parallel Molecular Statics Simulations of the Percolation of Dislocations through a Random Array of Forest Dislocation Obstacles in ...

448

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

449

Microsoft Word - besc_fact_sheet_090111.docx  

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

cellulosic biomass to sugars is the dominant obstacle to cost effective production of biofuels in s capable of significant enough quantities to displace U. S. consumption of fossil...

450

INVITED REVIEW The DOE BioEnergy Science Center-a U.S. Department  

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

is viewed as (1) the most significant obstacle to the establishment of a cellulosic biofuels industry, (2) essential to producing cost-competitive fuels, and (3) widely...

451

Improving the reliability of wind power through spatially distributed wind generation.  

E-Print Network (OSTI)

??Wind power is a fast-growing, sustainable energy source. However, the problem of wind variability as it relates to wind power reliability is an obstacle to… (more)

Fisher, Samuel Martin

2012-01-01T23:59:59.000Z

452

Sandia National Laboratories: Careers: Students & Postdocs: Fellowship...  

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

to develop collaborations, and funding for high-risk research activities, Sandia has done an exceptional job of removing any obstacles that could obstruct a Fellow's...

453

NETL: Oil & Natural Gas Projects  

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

II platform with the remote field eddy current inspection sensor. Demonstration of remote launch, maneuvering, obstacle handling, pipeline inspection and retrieval of...

454

Publications  

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

Sweitzer, Glenn, and Russell Johnson. "Obstacles to the Use of Exterior Fenestration and Daylighting Control Systems in the U.S." In Windows in Building Design & Maintenance....

455

Building and Fire Publications  

Science Conference Proceedings (OSTI)

... Kwon, SW; Liapi, KA; Haas, CT; Sreenivasan, SV; McLaughlin, JT; Rapid Human-Assisted Creation of Bounding Models for Obstacle Avoidance in ...

456

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

Science Conference Proceedings (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

457

Syracuse Univesity Test Report On Uptake Factor Resulting From A Dropped Storage Container - Phase II  

Science Conference Proceedings (OSTI)

Under certain circumstances, powder from an accidently dropped container can become airborne and inhaled by people nearby such as those who are moving the containers. The inhaled fine particles can deposit on respiratory tracts and lungs, causing asthma, lung cancer, and other acute respiratory illnesses and chronic symptoms. The objective of this study was to develop a standard procedure to measure the airborne concentrations of different size particles within the vicinity of a dropped container where a significant portion of the contained powder is ejected. Tungsten oxide (WO{sub 3}) was selected in this study to represent relatively heavy powders (7.16 g/cm3 specific gravity for WO{sub 3}). A typical can with the outer dimensions of 4.25” diameter and 4.875” tall was used as the container. The powder was dropped in two different configurations: 1) contained within a can covered by a lid that has a 0.25” diameter hole, and 2) contained within a can without a lid. The packing volume of the powder was 51.4 in3 (842.7 cm{sup 3}) and the target mass was 1936 g. The tests were carried out in a full-scale stainless steel environmental chamber with an interior volume of 852 ft3 (24.1 m3). The chamber system includes an internal recirculation loop with a rectangular air diffuser and 10 variable frequency drive fans to provide a typical room air recirculation flow pattern. Two air filters were installed in the chamber air supply duct and return duct to achieve the required low background particle concentration. The initial chamber air conditions were set at 70°F (± 5°F) and 50% (± 10%) RH. A supporting frame and releasing device were designed and built to trigger consistently the dropping of the can. The particle sampling inlet was placed 5 ft above the floor and 6 inches laterally away from the can’s falling path. Concentrations of particles between 0.5 ?m and 20 ?m were recorded in units of mass and number of particles per unit volume. The data acquisition rate was once every 2 seconds during the first 2 hours. A test procedure was developed and verified. A total of thirty two drop tests were performed, eight in Phase I and twenty four in Phase II, covering variations in dropping height (8 ft or 4 ft from the floor), room air movement (0.25-0.30 m/s or 0.10-0.15 m/s near the ceiling), landing scenario (on a flat plate or a block), and lid condition (Ľ” lid hole or no lid). There were ten tests with flat plate and Ľ” lid hole, ten tests with flat plate no lid and twelve tests with block no lid.

Gao, Zhi; Zhang, Jianshun S.

2012-01-01T23:59:59.000Z

458

Wall-following method for an autonomous mobile robot using two IR sensors  

Science Conference Proceedings (OSTI)

The paper presents a local navigation method for mobile robot, based on sensorial information given by two IR sensors. These types of sensors are simple and relatively low-cost sensing modalities to perform navigation tasks in environments with obstacles ... Keywords: IR sensors, behaviors, mobile robot, obstacles avoidance, wall-following

I. Gavrilut; V. Tiponut; A. Gacsadi; L. Tepelea

2008-07-01T23:59:59.000Z

459

A Study of Premixed Propagating Flame Vortex Interaction  

Science Conference Proceedings (OSTI)

Experimental data is presented for the interaction between a propagating flame and a simple vortex flow field structure generated in the wake of solid obstacles. The interaction between gas movement and obstacles creates vortex shedding forming a simple ... Keywords: Combustion, Flame/Vortex, PIV, Visualization

G. K. Hargrave; S. Jarvis

2006-04-01T23:59:59.000Z

460

Technology-Based Handling of Science Misconceptions: The GeoDist Tool on the Distinction of Greenhouse Effect and Ozone Depletion  

Science Conference Proceedings (OSTI)

The didactic utilization of the conceptual obstacles constitutes an alternative approach for the design of learning situations in science education, in order to produce a conceptual change and overcome them. Adopting this positive perspective, a relative ... Keywords: conceptual obstacles, GeoDist (Greenhouse Effect and Ozone Depletion Dis-tinction), Science Misconceptions

Sofia J. Hadjileontiadou; Theoxaris Vasilakoglou

2008-07-01T23:59:59.000Z

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.


461

Optimal pulse control of dynamic systems in the shock phase  

Science Conference Proceedings (OSTI)

For minimization and maximization of the kinetic energy of a body hitting a fixed visco-elastic obstacle with the energy calculated at the instant of body detachment from the obstacle, the optimal control laws in the impact phase were obtained.

A. A. Galyaev

2006-01-01T23:59:59.000Z

462

Robot navigation in very cluttered environments by preference-based fuzzy behaviors  

Science Conference Proceedings (OSTI)

One of the key challenges in application of Autonomous Ground Vehicles (AGVs) is navigation in environments that are densely cluttered with obstacles. The control task becomes more complex when the configuration of obstacles is not known a priori. The ... Keywords: Cluttered environment, Preference-based fuzzy behaviors, Robot navigation

Majura F. Selekwa; Damion D. Dunlap; Dongqing Shi; Emmanuel G. Collins, Jr.

2008-03-01T23:59:59.000Z

463

Fuzzy decision making on direction changes of water pollution monitoring underwater robots  

Science Conference Proceedings (OSTI)

Fuzzy decision making on trajectory direction changes of pollution monitoring robots is addressed in this paper. Measured pollution densities and the possible existence of obstacles are used as the two fundamental data. While pursuing water pollution ... Keywords: fuzzy decision making, obstacle recognition, trade-off, water pollution monitoring

Seung Y. Na; Daejung Shin; Jin Y. Kim; Seong-Joon Baek

2007-05-01T23:59:59.000Z

464

REVIEW / SYNTHSE Comparative morphology of the body wall in  

E-Print Network (OSTI)

been the subject of more comprehensive reviews of epidermal ultrastructure (Bedini and Papi 1974; Tyler of the epidermal cell bearing them (Bedini and Papi 1974; Ehlers 1985; Rohde and Watson 1995). Some species in proseriates (Bedini and Papi 1974; Ehlers 1985). Tall epidermal cells (e.g., the columnar cells of polyclads

Hooge, Matthew

465

Eddy–Mean Flow Interaction in the Gulf Stream at 68°W. Part I: Eddy Energetics  

Science Conference Proceedings (OSTI)

From June 1988 to August 1990 twelve tall, high-performance, current meter moorings measured the Gulf Stream's velocity and temperature fields at nominal depths of 400 m, 700 m, 1000 m, and 3500 m along three lines centered at 68°W. The overall ...

Meghan Cronin; D. Randolph Watts

1996-10-01T23:59:59.000Z

466

Live Theater Wetland Kayak Trip  

E-Print Network (OSTI)

Live Theater Wetland Kayak Trip Adapted from http://water.usgs.gov/outreach/poster2/grade footprints(squish squish) in the mud with every pass. The shore was lined with tall cattails, but we found doused in sun screen, with me in the front and Mrs. Findley doing all the work steering in the back

Texas at Austin, University of

467

CO2 Capture by Absorption with Potassium Carbonate  

E-Print Network (OSTI)

The University of Texas at Austin #12;2 Disclaimer This report was prepared as an account of work sponsored demonstrated that vacuum strippers will be more energy efficient if constructed short and fat rather than tall and skinny. The matrix stripper has been identified as a configuration that will significantly reduce energy

Rochelle, Gary T.

468

Preventing Electrical Shock  

E-Print Network (OSTI)

Most electrocution deaths on farms involve moving tall equipment that comes in contact with power lines. Other causes are damaged electrical systems in buildings and misuse of extension cords. This publication lists specific safety precautions you can take to prevent electrocution and handle emergencies should they occur.

Smith, David

2004-09-16T23:59:59.000Z

469

UrbanSolutionsCenter Landscape Maintenance Practices Influence Fire Ant Establishment  

E-Print Network (OSTI)

plants (Belnap 1995, Belnap and Harper 1995), and perhaps benefit herbivores and other consumers (Harper- icels (mounds), typically 5­15 cm long, up to 7 cm tall, and aligned in a NNW­SSE direction (Fig. 1 and George et al. 2000). These mounds likely form due to a combination of abiotic processes, such as soil up

470

MAKING BIOELECTRICITY ECONOMIC IN THE UK BIOMASS CONFERENCE HAMBURG 2009  

E-Print Network (OSTI)

- economic comparison of power production by biomass fast pyrolysis with gasification and combustion, Comparisons of alternative routes for biomass fuel biomass pellets, pyrolysis oil and tall oil pitch paperMAKING BIOELECTRICITY ECONOMIC IN THE UK 17TH BIOMASS CONFERENCE ­ HAMBURG 2009 Thornley, P1

471

Modification of the Colony Tower for the RIO BLANCO detonation  

SciTech Connect

The tower is a 180-ft tall steel-frame experimental oil shale processing retort structure with heavy process equipment on various levels. The structural response of the tower to the ground motion from Project Rio Blanco is analyzed and the necessary structural modifications described. (TFD)

Blume, J.A.; Lee, L.A.; Freeman, S.A.; Honda, K.K.

1974-04-30T23:59:59.000Z

472

A six-year climatology of fronts affecting Helsinki, Finland and their boundary layer structure  

Science Conference Proceedings (OSTI)

A six-year climatology of the frequency, characteristics, and boundary-layer structure of synoptic-scale fronts in Helsinki, Finland was created using significant weather charts and observations from a 327 m tall mast and from the Station for ...

Victoria A. Sinclair

473

Do the Tallest Convective Cells over the Tropical Ocean Have Slow Updrafts?  

Science Conference Proceedings (OSTI)

Far from continents, a few storms lift precipitation-size ice particles into the stratosphere, 17 to 18 km above the tropical ocean. This study is the first to examine the observed properties of a large sample of these extremely tall convective ...

Owen A. Kelley; John Stout; Michael Summers; Edward J. Zipser

2010-05-01T23:59:59.000Z

474

Notes on the comparison class  

Science Conference Proceedings (OSTI)

This paper investigates the role of comparison classes in the semantics of gradable adjectives in the positive form, focusing on the case where the comparison class is expressed overtly via a for-phrase (e.g. John is tall for a jockey). Two central questions ...

Stephanie Solt

2009-07-01T23:59:59.000Z

475

The effects of atmospheric pressure plasma on the synthesis of carbon nanotubes  

Science Conference Proceedings (OSTI)

In this study, we investigated the effects of atmospheric plasma on the synthesis of carbon nanotubes (CNTs) forests. Tall and high CNTs forests have been successfully grown on a large scale using a newly developed system called atmospheric pressure ... Keywords: Atmospheric pressure, Carbon nanotubes, Mass production, Plasma effects, Plasma enhanced chemical vapor deposition

Seok Seung Shin; Bum Ho Choi; Young Mi Kim; Jong Ho Lee; Dong Chan Shin

2009-04-01T23:59:59.000Z

476

Eddy–Mean Flow Interaction in the Kuroshio Extension Region  

Science Conference Proceedings (OSTI)

The authors use data collected by a line of tall current meter moorings deployed across the axis of the Kuroshio Extension (KE) jet at the location of maximum time-mean eddy kinetic energy to characterize the mean jet structure, the eddy ...

Stephanie Waterman; Nelson G. Hogg; Steven R. Jayne

2011-06-01T23:59:59.000Z

477

Hempseed oil in a nutshell  

Science Conference Proceedings (OSTI)

Industrial hemp is as a class of non-drug Cannabis sativa varieties, and hempseed is technically an achene, or nut. Both the seed and hemp's tall stalk provide significant carbohydrate feedstocks for a wide variety of industrial purposes in sever

478

Survey of Selected Seeps and Springs within the  

E-Print Network (OSTI)

during the wet season (May 2011) at a remote rainforest site [Amazonian Tall Tower Observatory (ATTO oxidation, as well as reference samples generated by spray- drying of pure organic compounds in aqueous and isoprene oxidation; (ii) glucose as carbohydrate reference compound from spray-drying of aqueous solution

479

D A R G A N M . W . F R I E R S O N D E P A R T M E N T O F A T M O S P H E R I C S C I E N C E S  

E-Print Network (OSTI)

Arabia of wind ¡ Could provide 9 times US electricity usage just in lower 48 �� Oldddddd technology of the electricity anywhere ¡ Denmark deals with this by selling excess power to Norway Having a grid reached at 30 mph" Produce electricity ¾ of the time at Wild Horse" " " " " Turbines - 351 feet tall from

Frierson, Dargan

480

average shedding rate for each type oftag. Type-I shedding, which occurs immediately after release,  

E-Print Network (OSTI)

-tall O'Shaughnessy Dam provided the city with a reliable, gravity-fed supply of water so clean- ing of a dam in the naturalist's beloved Yosemite National Park. Muir had fought the proposal that it still needs no filtration. The environmental cost was steep, however: The dam flooded Hetch Hetchy

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

Vertical Development of Lightning Activity Observed by the LDAR System: Lightning Bubbles  

Science Conference Proceedings (OSTI)

In some Florida thunderstorm cells, impulsive very high frequency (VHF) radiation from lightning channels begins abruptly in a layer that is typically 3–6 km in diameter, 1–3 km tall, and initially located just above the freezing level. In 208 ...

Tomoo Ushio; Stan J. Heckman; Hugh J. Christian; Zen-Ichiro Kawasaki

2003-02-01T23:59:59.000Z

482

Interview of F.K.Lehman  

E-Print Network (OSTI)

:46:05 Experience of China limited to Yunnan; first went there 1938, and to Kunming in 1939 where then the only tall structure was the bell tower, no paved roads, population less than 1 million, now 5 million, was a remote provincial capital, now a modern...

Lehman, F K (Chris)

2004-06-18T23:59:59.000Z

483

A Study on the Effect of Nudging on Long-Term Boundary Layer Profiles of Wind and Weibull Distribution Parameters in a Rural Coastal Area  

Science Conference Proceedings (OSTI)

By use of 1 yr of measurements performed with a wind lidar up to 600-m height, in combination with a tall meteorological tower, the impact of nudging on the simulated wind profile at a flat coastal site (Hřvsřre) in western Denmark using the ...

S.-E. Gryning; E. Batchvarova; R. Floors

2013-05-01T23:59:59.000Z

484

Deposition of Aerially Applied BT in an Oak Forest and Its Prediction with the FSCBG Model  

Science Conference Proceedings (OSTI)

Data are provided from 17 single-swath aerial spray trials that were conducted over a fully leafed, 16-m tall, mixed oak forest. The distribution of cross-swath spray deposits was sampled at the top of the canopy and below the canopy. ...

Dean E. Anderson; David R. Miller; Yansen Wang; William G. Yendol; Karl Mierzejewski; Michael L. McManus

1992-12-01T23:59:59.000Z

485

Microfluidic radiolabeling of biomolecules with PET radiometals Dexing Zeng a  

E-Print Network (OSTI)

murine tumour models [3­5] and patient studies [5,6], with promising results. The prepara- tion to possibly more reactive minor impurities), product purification and product analysis can be prob- lematic or tall), mixing units, heaters, pumping sys- tems, are able to control and process chemical or biological

Kenis, Paul J. A.

486

A Numerical Model of the Formation and Evolution of a Low-Level Jet  

Science Conference Proceedings (OSTI)

A one-layer. one-dimensional numerical model is described which simulates the life cycle of the extratropical low-level jet (LLJ). The LLJ starts as an isallobaric wind near the point of maximum pressure tall. Subsequently, the LLJ expands over a ...

Dušan Djuri?

1981-02-01T23:59:59.000Z

487

monticello.cdr  

Office of Legacy Management (LM)

piles at four locations adjacent to Montezuma Creek near the mill. Tailings carried by wind or Montezuma Creek spread contamination to nearby properties. Throughout the operating...

488

NETL: News Release - DOE-Funded Project Revives Aging California...  

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

steam from a nearby power plant. However, inexpensive steam became unavailable when the power plant shut down. Future expansion of thermal recovery would require improving the...

489

Ninth Biennial OMVPE Workshop: About the Sawgrass Marriott Resort  

Science Conference Proceedings (OSTI)

The extensive hotel amenities include a full-range of restaurants and shops, as well as easy access to nearby restaurants and historic St. Augustine. The Marriott

490

Document5  

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

ray- centered masterclass. Eleven students and many of their teachers from nearby high schools attended the session to investigate cosmic rays. The students attended an opening...

491

TableHC1.1.1.xls  

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

zone according to the 30-year average annual degree-days for an appropriate nearby weather station. Q Data withheld either because the Relative Standard Error (RSE) was...

492

TableHC2.1.xls  

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

zone according to the 30-year average annual degree-days for an appropriate nearby weather station. Q Data withheld either because the Relative Standard Error (RSE) was...

493

New infrastructure boosts West Virginia, southern Pennsylvania ...  

U.S. Energy Information Administration (EIA)

A notable increase since early 2012 in natural gas production in West Virginia and nearby counties in southern Pennsylvania continued through July 2013.

494

American Recovery and Reinvestment Act (ARRA) FEMP Technical Assistance U.S. Army Project 181 Implementation Challenges in Deployment of an Energy Security Microgrid for Army Reserve Facilities located on the Former Fort Devens Army Base  

Science Conference Proceedings (OSTI)

This documents reports on a request for technical assistance from Fort Devens to analyze procurement of energy from nearby renewable generating resources.

Warwick, William M.

2010-09-30T23:59:59.000Z

495

NIST Tech Beat, April 1998  

Science Conference Proceedings (OSTI)

... by Ebert, says the structures cost about the same as steel towers initially. ... salt from the nearby ocean, expects to save $700 per tower on annual ...

496

Molecular organic geochemistry of the oil and source rocks in Railroad Valley, eastern Great Basin, Nevada, United States.  

E-Print Network (OSTI)

??A comprehensive geochemical study of oils from Railroad Valley, Nevada and two candidate source rock intervals from the nearby Egan Range, was conducted in order… (more)

Ahdyar, LaOde

2011-01-01T23:59:59.000Z

497

Drowned carbonate platforms in the Bismarck Sea, Papua New Guinea  

E-Print Network (OSTI)

possible causes of subsidence: (1) ?exural loading by nearby3) fore-arc ?exural subsidence caused by G. Hoffmann (&) Áprovide evidence for subsidence in the central section of

Hoffmann, Gary; Silver, Eli; Day, Simon; Driscoll, Neal; Appelgate, Bruce

2009-01-01T23:59:59.000Z

498

Microsoft Word - Sera - writeup Lexus SUV AR Testing.doc  

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

logs have been posted for the HEVs on nearby www pages. The information includes miles driven, fuel economy, operations and maintenance requirements, and operating and...

499

Research Needs: Glass Solar Reflectance and Vinyl Siding  

E-Print Network (OSTI)

properties of reflected solar radiation from glass surfaces,transfer at the siding surface. Direct solar radiation tosiding, reflected solar radiation from nearby surfaces,

Hart, Robert

2012-01-01T23:59:59.000Z

500

Appendix C  

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

on top of a construction debris landfill and supplying nearby Bloom school with renewable electricity. This turbine will not exceed 350' height as specified by the FAA. Current...