Sample records for terrain roughness terrain

  1. Speed Map for Autonomous Rovers over Rough Terrain

    E-Print Network [OSTI]

    Loh, Jonathan Edau

    2012-01-01T23:59:59.000Z

    Grid Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . .considered obstacles [27] Grid Map showing Tile Size, Cellspeed map. It also covers grid maps and terrain roughness,

  2. BAYESIAN METHOD FOR SEGMENTATION OF SAR IMAGES IN ROUGH TERRAIN

    E-Print Network [OSTI]

    Oldenburg, Carl von Ossietzky Universität

    BAYESIAN METHOD FOR SEGMENTATION OF SAR IMAGES IN ROUGH TERRAIN Marco Caparrini1 , Klaus Seidel1 are the basis for radiometric correction. Considering SAR images, the huge amount of processing for geographic and geometric calibration and registration that is needed prior to analysis is well established. Nonetheless

  3. Design of a chain flail mower for leveling rough terrain

    E-Print Network [OSTI]

    Flores, Aaron (Aaron N.)

    2014-01-01T23:59:59.000Z

    The flail mower is a piece of agricultural equipment that uses bladed attachments rotating around a drum to cut down bushes and grassy terrain. One major drawback to the flail mower is the rapid wear that happens almost ...

  4. Development of a Hybrid Powered 2D Biped Walking Machine Designed for Rough Terrain Locomotion

    E-Print Network [OSTI]

    Baker, Bryce C.

    2010-07-28T23:59:59.000Z

    has built a three legged 2D biped walking machine to be used as a test stand for studying rough terrain walking. The specific aim of this research is to investigate how biped walkers can best maintain walking stability when acted upon by small...

  5. Terrain identification methods for planetary exploration rovers

    E-Print Network [OSTI]

    Brooks, Christopher Allen, 1978-

    2004-01-01T23:59:59.000Z

    Autonomous mobility in rough terrain is becoming increasingly important for planetary exploration rovers. Increased knowledge of local terrain properties is critical to ensure a rover's safety, especially when driving on ...

  6. Modeling, system identication, and control for dynamic locomotion of the LittleDog robot on rough terrain

    E-Print Network [OSTI]

    Levashov, Michael Yurievich

    2012-01-01T23:59:59.000Z

    In this thesis, I present a framework for achieving a stable bounding gait on the LittleDog robot over rough terrain. The framework relies on an accurate planar model of the dynamics, which I assembled from a model of the ...

  7. Bipedal Robotic Walking on Flat-Ground, Up-Slope and Rough Terrain with Human-Inspired Hybrid Zero Dynamics

    E-Print Network [OSTI]

    Nadubettu Yadukumar, Shishir 1986-

    2012-12-10T23:59:59.000Z

    The thesis shows how to achieve bipedal robotic walking on flat-ground, up-slope and rough terrain by using Human-Inspired control. We begin by considering human walking data and find outputs (or virtual constraints) that, when calculated from...

  8. Development of the Robotic Touch foot Sensor for 2D walking Robot, for Studying Rough Terrain Locomotion

    E-Print Network [OSTI]

    Lee, Hunwoo

    2012-08-31T23:59:59.000Z

    Development of the Robotic Touch foot Sensor for 2D walking Robot, for Studying Rough Terrain Locomotion By HUNWOO LEE Submitted to the graduate degree program in Mechanical Engineering and the Graduate Faculty of the University of Kansas... ________________________________ Professor Robert Umholtz Date Defended: June 5, 2012 ii The Thesis Committee for HUNWOO LEE certifies that this is the approved version of the following thesis: Development of the Robotic Touch Foot Sensor for 2D Walking Robot...

  9. Good terrain geometry, cheap!

    SciTech Connect (OSTI)

    Duchaineau, M. [Los Alamos National Lab., NM (United States)]|[Lawrence Livermore National Lab., CA (United States); Wolinsky, M.; Sigeti, D.E. [Los Alamos National Lab., NM (United States)] [and others

    1997-04-01T23:59:59.000Z

    Real-time terrain rendering for interactive visualization remains a demanding task. We present a novel algorithm with several advantages over previous methods: our method is unusually stingy with polygons yet achieves real-time performance and is scalable to arbitrary regions and resolutions. The method provides a continuous terrain mesh of specified triangle count having provably minimum error in restricted but reasonably general classes of permissible meshes and error metrics. Our method provides an elegant solution to guaranteeing certain elusive types of consistency in scenes produced by multiple scene generators which share a common finest-resolution database but which otherwise operate entirely independently. This consistency is achieved by exploiting the freedom of choice of error metric allowed by the algorithm to provide, for example, multiple exact lines-of-sight in real-time. Our methods rely on an off-line pre-processing phase to construct a multi-scale data structure consisting of triangular terrain approximations enhanced ({open_quotes}thickened{close_quotes}) with world-space error information. In real time, this error data is efficiently transformed into screen-space where it is used to guide a greedy top-down triangle subdivision algorithm which produces the desired minimal error continuous terrain mesh. Our algorithm has been implemented and it operates at real-time rates.

  10. Terrainosaurus: realistic terrain synthesis using genetic algorithms

    E-Print Network [OSTI]

    Saunders, Ryan L.

    2007-04-25T23:59:59.000Z

    ), are solid evidence that believable terrain can be visualized in real-time with current technology. Terrain generation, in contrast, has received comparatively little treatment in the literature. Fractal-based techniques are the most prevalent, because... noted, fractal methods for terrain generation are limited in the types of terrain they can simulate, and one generally has to resort to elevation maps digitized from the real world to get more interesting and believable terrain models. In this thesis, I...

  11. Evaluating Hydrology Preservation of Simplified Terrain Representations

    E-Print Network [OSTI]

    Varela, Carlos

    Evaluating Hydrology Preservation of Simplified Terrain Representations Ph. D. Student: Christopher captures the hydrology is important for determining the effectiveness of a terrain simplification technique also present a novel ter- rain simplification algorithm based on the compression of hydrology features

  12. Terrain Characterization and Classification with a Mobile

    E-Print Network [OSTI]

    Borenstein, Johann

    , commonly known categories, such as gravel, sand, or as- phalt. Terrain characterization, on the other hand aims at associating terrain with well-defined categories, such as gravel, sand, or dirt. A related for a turn is lower when driving over sand or wet grass than when driving on packed dirt or asphalt. In order

  13. Alteration of Terrain Permits (New Hampshire)

    Broader source: Energy.gov [DOE]

    This permit is required whenever a project proposes to disturb more than 100,000 square feet of contiguous terrain (50,000 square feet if any portion of project is within protected shoreland), or...

  14. Evaluating Hydrology Preservation of Simplified Terrain Representations

    E-Print Network [OSTI]

    Franklin, W. Randolph

    Evaluating Hydrology Preservation of Simplified Terrain Representations Jonathan Muckella , Marcus network. A quan- titative measurement of how accurately a drainage network captures the hydrology to preserve the important hydrology features. This method and other simplification schemes are then evaluated

  15. Terrain Trafficability Characterization with a Mobile Robot

    E-Print Network [OSTI]

    Borenstein, Johann

    for a turn is lower when driving over sand or wet grass than when driving on packed dirt or asphalt tests we collected data on a variety of different terrains, such as gravel, sand, asphalt, grass

  16. High performance robotic traverse of desert terrain.

    SciTech Connect (OSTI)

    Whittaker, William (Carnegie Mellon University, Pittsburgh, PA)

    2004-09-01T23:59:59.000Z

    This report presents tentative innovations to enable unmanned vehicle guidance for a class of off-road traverse at sustained speeds greater than 30 miles per hour. Analyses and field trials suggest that even greater navigation speeds might be achieved. The performance calls for innovation in mapping, perception, planning and inertial-referenced stabilization of components, hosted aboard capable locomotion. The innovations are motivated by the challenge of autonomous ground vehicle traverse of 250 miles of desert terrain in less than 10 hours, averaging 30 miles per hour. GPS coverage is assumed to be available with localized blackouts. Terrain and vegetation are assumed to be akin to that of the Mojave Desert. This terrain is interlaced with networks of unimproved roads and trails, which are a key to achieving the high performance mapping, planning and navigation that is presented here.

  17. Adaptive Streaming and Rendering of Large Terrains using Strip Masks

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Adaptive Streaming and Rendering of Large Terrains using Strip Masks Joachim Pouderoux Jean-Eudes Marvie IPARLA Project (LaBRI - INRIA Futurs) University of Bordeaux, France Abstract Terrain rendering is an important factor in the rendering of virtual scenes. If they are large and detailed, digital terrains can

  18. Creating Standards for Winter Terrain Parks

    E-Print Network [OSTI]

    to engineering frame motivated creation of a 501c(3) non-profit, United States Terrain Park Council Dedicated fatalities (31 male, 6 female) mostly young J. Shealy (2000) Snowboard injury rate doubled during 1990-2000 from 3.37 to 6.97 per 1000 skier days Deaths: 50 (2007-2008) 39 (2008-2009) Compiled by California Ski

  19. TERRAIN ESTIMATION USING INTERNAL SENSORS Debangshu Sadhukhan, Carl Moore, Emmanuel Collins

    E-Print Network [OSTI]

    Collins, Emmanuel

    was successful in identifying gravel, packed dirt, and grass. KEY WORDS Mobile robot, terrain identification. For our research "sensing terrain" means determining the type of terrain, i.e.: gravel, sand, asphalt, mud

  20. Hydrology-Aware Constrained Triangulation of Terrain Data

    E-Print Network [OSTI]

    Franklin, W. Randolph

    Hydrology-Aware Constrained Triangulation of Terrain Data Jonathan Muckella , Marcus Andradeb , W present a new data structure for simplifing terrain that captures hydrology significant features using. This allows better compression ratios the standard Triangu- lated Irregular Networks with highier hydrology

  1. Feature-based Terrain Editing From Complex Sketches

    E-Print Network [OSTI]

    Tasse, Flora Ponjou; Emilien, Arnaud; Cani, Marie-Paule; Hahmann, Stefanie; Dodgson, Neil

    2014-09-19T23:59:59.000Z

    with plausible details.160 Cohen et al. [10] and Watanabe et al. [11] present the first161 terrain modelling interfaces that take as input a 2D silhouette162 stroke directly drawn on a 3D terrain model. They only han-163 dle a single silhouette stroke... -junctions. Our method is also able to han-637 dle complex mountains where ridges are not as well-defined as638 they are on smooth landscapes. An example of this is shown639 in Figure 10. Our proposed approach differs from other sketch-640 based methods...

  2. MESOSCALE MODELLING OF WIND ENERGY OVER NON-HOMOGENEOUS TERRAIN

    E-Print Network [OSTI]

    Pielke, Roger A.

    MESOSCALE MODELLING OF WIND ENERGY OVER NON-HOMOGENEOUS TERRAIN (ReviewArticle) Y. MAHRER.1. OBSERVATIONALAPPROACHES Evaluations of wind energy based on wind observations (usually surface winds) at well, the resolution of the wind energy pattern throughout an extended area by this methodology requires a large number

  3. Unsupervised Learning of Terrain Appearance for Automated Coral Reef Exploration

    E-Print Network [OSTI]

    Dudek, Gregory

    Unsupervised Learning of Terrain Appearance for Automated Coral Reef Exploration Philippe Giguere above a coral reef, without the need to maintain pose estimates. We tested the technique in simulation autonomously above a coral reef during a 20 minutes period. 1. Introduction Underwater marine environments

  4. MARS TERRAIN IMAGE CLASSIFICATION USING CARTESIAN GENETIC PROGRAMMING

    E-Print Network [OSTI]

    Fernandez, Thomas

    MARS TERRAIN IMAGE CLASSIFICATION USING CARTESIAN GENETIC PROGRAMMING J. Leitner, S. Harding, A. F to human designed approaches, a great deal of progress has been made using machine learning techniques to perform classification from images. In this work, we demonstrate the first known use of Cartesian Genetic

  5. Digital Terrain Modeling Ayman F. Habib ENGO 573: Chapter 4

    E-Print Network [OSTI]

    Habib, Ayman

    Photography (Tropical) SPOT Satellite Aerial Photography (Urban) Satellite Stereo SAR (RADARSAT) Airborne orthogonally projected maps. · Procedure: ­ Interior orientation. · Calibration procedure. ­ Exterior a calibration procedure. #12;10 Digital Terrain Modeling Ayman F. Habib 19 Test Field for Camera Calibration

  6. ROAMing terrain (Real-time Optimally Adapting Meshes)

    SciTech Connect (OSTI)

    Duchaineau, M.; Wolinsky, M.; Sigeti, D.E.; Miller, M.C.; Aldrich, C.; Mineev, M.

    1997-07-01T23:59:59.000Z

    Terrain visualization is a difficult problem for applications requiring accurate images of large datasets at high frame rates, such as flight simulation and ground-based aircraft testing using synthetic sensor stimulation. On current graphics hardware, the problem is to maintain dynamic, view-dependent triangle meshes and texture maps that produce good images at the required frame rate. We present an algorithm for constructing triangle meshes that optimizes flexible view-dependent error metrics, produces guaranteed error bounds, achieves specified triangle counts directly, and uses frame-to-frame coherence to operate at high frame rates for thousands of triangles per frame. Our method, dubbed Real-time Optimally Adapting Meshes (ROAM), uses two priority queues to drive split and merge operations that maintain continuous triangulations built from pre-processed bintree triangles. We introduce two additional performance optimizations: incremental triangle stripping and priority-computation deferral lists. ROAM execution time is proportionate to the number of triangle changes per frame, which is typically a few percent of the output mesh size, hence ROAM performance is insensitive to the resolution and extent of the input terrain. Dynamic terrain and simple vertex morphing are supported.

  7. Atmospheric studies in complex terrain: a planning guide for future studies

    SciTech Connect (OSTI)

    Orgill, M.M.

    1981-02-01T23:59:59.000Z

    The objective of this study is to assist the US Department of Energy in Conducting its atmospheric studies in complex terrain (ASCOT0 by defining various complex terrain research systems and relating these options to specific landforms sites. This includes: (1) reviewing past meteorological and diffusion research on complex terrain; (2) relating specific terrain-induced airflow phenomena to specific landforms and time and space scales; (3) evaluating the technical difficulty of modeling and measuring terrain-induced airflow phenomena; and (4) avolving severdal research options and proposing candidate sites for continuing and expanding field and modeling work. To evolve research options using variable candidate sites, four areas were considered: site selection, terrain uniqueness and quantification, definition of research problems and research plans. 36 references, 111 figures, 20 tables.

  8. Mapping textures on 3d terrains: a hybrid cellular automata approach

    E-Print Network [OSTI]

    Sinvhal, Swapnil

    2007-04-25T23:59:59.000Z

    ?. Benati [7] showed that cellular automata can be used to model phenomena typical of living communities like reproduction, self-organization and a complex evolution. An interesting relation between fractals and cellular automata has been discussed... automata approach to represent a model. This gives the advantage of direct texture simulation on the model. II.c Terrain Generation Fractals [57] have been used to generate terrains by many terrain generation engines like fracPlanet [1] and Frac...

  9. On-the-Fly Decompression and Rendering of Multiresolution Terrain

    SciTech Connect (OSTI)

    Lindstrom, P; Cohen, J D

    2009-04-02T23:59:59.000Z

    We present a streaming geometry compression codec for multiresolution, uniformly-gridded, triangular terrain patches that supports very fast decompression. Our method is based on linear prediction and residual coding for lossless compression of the full-resolution data. As simplified patches on coarser levels in the hierarchy already incur some data loss, we optionally allow further quantization for more lossy compression. The quantization levels are adaptive on a per-patch basis, while still permitting seamless, adaptive tessellations of the terrain. Our geometry compression on such a hierarchy achieves compression ratios of 3:1 to 12:1. Our scheme is not only suitable for fast decompression on the CPU, but also for parallel decoding on the GPU with peak throughput over 2 billion triangles per second. Each terrain patch is independently decompressed on the fly from a variable-rate bitstream by a GPU geometry program with no branches or conditionals. Thus we can store the geometry compressed on the GPU, reducing storage and bandwidth requirements throughout the system. In our rendering approach, only compressed bitstreams and the decoded height values in the view-dependent 'cut' are explicitly stored on the GPU. Normal vectors are computed in a streaming fashion, and remaining geometry and texture coordinates, as well as mesh connectivity, are shared and re-used for all patches. We demonstrate and evaluate our algorithms on a small prototype system in which all compressed geometry fits in the GPU memory and decompression occurs on the fly every rendering frame without any cache maintenance.

  10. Wavelet Analysis for a New Multiresolution Model for Large-Scale Textured Terrains

    E-Print Network [OSTI]

    Illes Balears, Universitat de les

    Wavelet Analysis for a New Multiresolution Model for Large-Scale Textured Terrains María José transmission of both geometry and textures of a terrain model. Wavelet Multiresolution Analysis is applied. An innovative texture synthesis process based on Wavelet classification is used in the reconstruction

  11. Energetically Optimal Travel across Terrain: Visualizations and a New Metric of Geographic Distance with Archaeological Applications

    E-Print Network [OSTI]

    Wood, Zoë J.

    Energetically Optimal Travel across Terrain: Visualizations and a New Metric of Geographic Distance the energetically least cost path is shown in blue. This visualization shows how least cost paths often follow propose new methods for terrain visualization and analysis based on measuring paths of least caloric

  12. A Uniform Sky Illumination Model to Enhance Shading of Terrain and Urban Areas

    E-Print Network [OSTI]

    Stewart, James

    . Brookville, NY 11050 USA (516) 299-2652 Patrick.Kennelly@liu.edu Fax: (516) 299-3945 and A. James Stewart (Foley et al. 1990). Cartographers consider the same factors when shading terrain. Imhof (1982) discussed reflector (Foley et al. 1990; Weibel and Heller 1991; Zhou 1992). Because most terrain elements behave more

  13. BEHAVIOR OF RADON PROGENY NEAR OUTDOOR SURFACES IN CONTRASTING TERRAINS

    E-Print Network [OSTI]

    S. D. Schery; P. T. Wasiolek; Y. Li

    Federal legislation expresses a long-term goal of reducing indoor radon to levels comparable to those outdoors. A thorough understanding of the behavior of radon and its progeny in the outdoor environment is therefore important We report near-surface measurements of radon, attached-to-aerosol progeny, and unattachcd-toaerosol progeny in the contrasting environments of the forested hill country of Oak Ridge, TN and the desert sands of White Sands National Monument, NM. Vertical progeny gradients are greater at White Sands due to a smoother terrain, and dose levels tend to be lower due to lower radon flux from the gypsum sand. Both sites show a significant diurnal variation of dose rate with a maximum occurring usually in the early morning. Correlation of dose rate variation with radon variation is surprisingly small suggesting the importance of other factors such as progeny deposition and aerosol concentration in controlling outdoor dose.

  14. An Algorithm for the Visualization of a Terrain with Objects FLVIO SZENBERG

    E-Print Network [OSTI]

    such as houses, vehicles, and transmission lines, thus allowing a simulated flight. For the objects, described and rapidly, aerial images of terrain with objects such as houses, vehicles, and transmission lines, thus

  15. The design of a frame for an all terrain, lever propelled wheelchair

    E-Print Network [OSTI]

    Walton, John Michael

    2011-01-01T23:59:59.000Z

    This thesis outlines the process of designing a frame for the Leveraged Freedom Chair (LFC) Prime, an all-terrain levered powered wheelchair designed to improve the mobility of disabled individuals. This design allows for ...

  16. Modelling of wind turbine wakes in complex terrain using computational fluid dynamics 

    E-Print Network [OSTI]

    Makridis, Alexandros

    2012-06-25T23:59:59.000Z

    This thesis focuses on modelling of wind turbine wakes when they are affected by real complex terrain features, such as hills and forests, and also examines the effect of the rotational momentum imparted to the downstream ...

  17. Accurate Wind Characterization in Complex Terrain Using the Immersed Boundary Method

    SciTech Connect (OSTI)

    Lundquist, K A; Chow, F K; Lundquist, J K; Kosovic, B

    2009-09-30T23:59:59.000Z

    This paper describes an immersed boundary method (IBM) that facilitates the explicit resolution of complex terrain within the Weather Research and Forecasting (WRF) model. Two different interpolation methods, trilinear and inverse distance weighting, are used at the core of the IBM algorithm. Functional aspects of the algorithm's implementation and the accuracy of results are considered. Simulations of flow over a three-dimensional hill with shallow terrain slopes are preformed with both WRF's native terrain-following coordinate and with both IB methods. Comparisons of flow fields from the three simulations show excellent agreement, indicating that both IB methods produce accurate results. However, when ease of implementation is considered, inverse distance weighting is superior. Furthermore, inverse distance weighting is shown to be more adept at handling highly complex urban terrain, where the trilinear interpolation algorithm breaks down. This capability is demonstrated by using the inverse distance weighting core of the IBM to model atmospheric flow in downtown Oklahoma City.

  18. Subsidence of residual soils in a karst terrain

    SciTech Connect (OSTI)

    Drumm, E.C.; Kane, W.F.; Ben-Hassine, J.; Scarborough, J.A. (Tennessee Univ., Knoxville, TN (USA)); Ketelle, R.H. (Oak Ridge National Lab., TN (USA))

    1990-06-01T23:59:59.000Z

    Siting and operating landfills for solid waste disposal in eastern Tennessee that can operate with minimum impact on groundwater is problematic. The operational requirement of thick, excavational soils and the regulatory requirement of a buffer between disposal units and an aquifer result in siting most operating East Tennessee landfills in outcrop areas of the Knox Group. However, the common occurrence of karst terrain and sinkholes in the Knox Group indicates the vulnerability of such sites to rapid groundwater recharge and flow and the potential for subsidence or collapse of soil into bedrock cavities. To address the potential for subsidence or collapse of soils at the East Chestnut Ridge site on the Department of Energy's (DOE) Oak Ridge Reservation (ORR), the following activities and analyses were completed: The locations of karst features on the site were determined by field reconnaissance; several sinkholes were selected for detailed examination; soil boring, sampling, and physical testing were performed in soils located within, adjacent to, and outside of sinkholes to characterize soil strength at various depths; detailed plane surveys were made for 11 sinkholes to measure accurately their dimension and shape for use in determining profile functions for subsidence basins at the site; The stress-deformation response of a typical soil profile overlying a hypothetical bedrock cavity was analyzed numerically for a range of soil thickness and a range of cavity radii. A consistent estimate of the relationship between subsidence basin dimension, soil thickness, and cavity radius has been derived. 30 refs., 41 figs., 7 tabs.

  19. Multiphase production through hilly terrain pipelines in Cusiana oilfield, Colombia

    SciTech Connect (OSTI)

    Hill, T.J.; Fairhurst, C.P.; Nelson, C.J.; Becerra, H.; Bailey, R.S.

    1996-12-31T23:59:59.000Z

    The Cusiana oilfield in Colombia is currently producing about 180,000 bpd through a complex multiphase flowline network. The terrain of the area is very hilly, with substantial elevation changes along the length of the lines. Prediction of pressure drop using industry standard correlations has been very variable in its accuracy. A revised pressure drop method, including the effect of slug formation and decay, has been produced, with appreciably better performance. Field data on flow regime characteristics from several of the lines are presented to show a transition from surging/slugging to a steady {open_quote}homogeneous{close_quote} flow at relatively low mixture velocity. The effect of slug flow on slugcatcher performance has also been assessed, both by direct measurement, and by use of a dynamic simulator. The simulator is used to test new control schemes prior to implementation. At low flowing velocities one line has been seen to undergo large pressure swings and to exhibit slug production due to liquid accumulation and sweepout. This effect is described, and re-produced using a transient simulator.

  20. Ultrawideband radar clutter measurements of forested terrain, 1991--1992

    SciTech Connect (OSTI)

    Sheen, D.M.; Severtsen, R.H.; Prince, J.M.; Davis, K.C.; Collins, H.D.

    1993-06-01T23:59:59.000Z

    The ultrawideband (UWB) radar clutter measurements project was conducted to provide radar clutter data for new ultrawideband radar systems which are currently under development. A particular goal of this project is to determine if conventional narrow band clutter data may be extrapolated to the UWB case. This report documents measurements conducted in 1991 and additional measurements conducted in 1992. The original project consisted of clutter measurements of forested terrain in the Olympic National Forest near Sequim, WA. The impulse radar system used a 30 kW peak impulse source with a 2 Gigasample/second digitizer to form a UHF (300--1000 MHz) ultrawideband impulse radar system. Additional measurements were conducted in parallel using a Systems Planning Corporation (SPC) step-chirp radar system. This system utilized pulse widths of 1330 nanoseconds over a bandwidth of 300--1000 MHz to obtain similar resolution to the impulse system. Due to the slow digitizer data throughput in the impulse radar system, data collection rates were significantly higher using the step-chirp system. Additional forest clutter measurements were undertaken in 1992 to increase the amount of data available, and especially to increase the amount of data from the impulse radar system.

  1. Low-cost multi-terrain autonomous vehicle for hostile environments

    SciTech Connect (OSTI)

    Perez, M. L., LLNL

    1996-12-03T23:59:59.000Z

    This paper describes an innovative and unique autonomous vehicle being developed at the Lawrence Livermore National Laboratory (LLNL) for versatile use in hostile environments. Conventional vehicles used in decommissioning and decontaminating, police activity, and unmanned military operations typically are designed with four-wheels or track in contact with the environment. Although four-wheel and track vehicles work well, they are limited in negotiating saturated terrain, steep hills and soft soils. The Spiral Track Autonomous Robot (STAR) is a versatile and maneuverable multi-terrain mobile vehicle that uses the latest available computer technology and two Archimedes screws, in contact with the local environment to intelligently negotiate a hostile environment.

  2. Engineering Applications of Artificial Intelligence 16 (2003) 465472 Predicting terrain contours using a feed-forward neural network

    E-Print Network [OSTI]

    Chen, Sheng

    Engineering Applications of Artificial Intelligence 16 (2003) 465­472 Predicting terrain contours in pneumatic systems and they are difficult to prevent completely. This caused problems during the testing. 2. Prediction of unknown terrain The legs of the robot needed to be lifted at the end

  3. Minimalistic Control of a Compass Gait Robot in Rough Terrain

    E-Print Network [OSTI]

    Iida, Fumiya

    Although there has been an increasing interest in dynamic bipedal locomotion for significant improvement of energy efficiency and dexterity of mobile robots in the real world, their locomotion capabilities are still mostly ...

  4. Real-time Rendering of Complex Vector Data on 3d Terrain Models

    E-Print Network [OSTI]

    Behnke, Sven

    Real-time Rendering of Complex Vector Data on 3d Terrain Models M. Schneider, M. Guthe, and R of buildings, streets and runway (from left to right). Abstract. In this paper we present a hybrid technique model. The first part of this hybrid technique is a texture-based approach that is especially suited

  5. Building Local Terrain Maps Using SpatioTemporal Classification for Semantic Robot Localization

    E-Print Network [OSTI]

    Zell, Andreas

    of the environment. We describe how to efficiently integrate the classification results of each time stepBuilding Local Terrain Maps Using Spatio­Temporal Classification for Semantic Robot Localization Stefan Laible1 and Andreas Zell1 Abstract-- The correct classification of the surrounding ter- rain

  6. LOD-Sprite Technique for Accelerated Terrain Rendering Baoquan Chen1

    E-Print Network [OSTI]

    Chen, Baoquan

    LOD-Sprite Technique for Accelerated Terrain Rendering Baoquan Chen1 SUNY at Stony Brook J. Edward present a new rendering technique, termed LOD-sprite render- ing, which uses a combination of a level-of-detail (LOD) represen- tation of the scene together with reusing image sprites (previously rendered images

  7. A Kalman-Particle Kernel Filter and its Application to Terrain Navigation

    E-Print Network [OSTI]

    Del Moral , Pierre

    A Kalman-Particle Kernel Filter and its Application to Terrain Navigation Dinh-Tuan Pham.musso@onera.fr Abstract ­ A new nonlinear filter, the Kalman- Particle Kernel Filter (KPKF) is proposed. Compared. Keywords: Kalman filter, kernel density estimator, regularized particle filter, Inertial navigation System

  8. Simple I/O-efficient flow accumulation on grid terrains Herman Haverkort

    E-Print Network [OSTI]

    Haverkort, Herman

    Simple I/O-efficient flow accumulation on grid terrains Herman Haverkort TU Eindhoven Jeffrey #12;Drainage network analysis 1 2­5 6­12 13­50 flooding flow routing flow accumulation compute network analysis flow routingwatershed labelling flow accumulation #12;Analysing I/O-efficiency main

  9. International Conference on Machine Control & Guidance 2008 1 Generation and Analysis of Digital Terrain Models with

    E-Print Network [OSTI]

    1st International Conference on Machine Control & Guidance 2008 1 Generation and Analysis of Digital Terrain Models with Parallel Guidance Systems for Precision Agriculture Görres GRENZDÖRFFER models at no or little additional cost. In the paper the achievable data accuracy under different

  10. MODELING OF SKID-STEERED WHEELED ROBOTIC VEHICLES ON SLOPED TERRAINS

    E-Print Network [OSTI]

    Collins, Emmanuel

    MODELING OF SKID-STEERED WHEELED ROBOTIC VEHICLES ON SLOPED TERRAINS Camilo Ordonez Center radii. This work presents the analysis and experimental verification of a dynamic model for skid-steered for Intelligent Systems, Controls and Robotics (CISCOR) Department of Mechanical Engineering Florida A

  11. CO2 transport over complex terrain Jielun Sun a,*, Sean P. Burns a

    E-Print Network [OSTI]

    Stephens, Britton B.

    CO2 transport over complex terrain Jielun Sun a,*, Sean P. Burns a , Anthony C. Delany a , Steven P; accepted 15 February 2007 Abstract CO2 transport processes relevant for estimating net ecosystem exchange investigated during a pilot experiment. We found that cold, moist, and CO2- rich air was transported downslope

  12. Saving the soil: AgriLife units work to improve training terrain 

    E-Print Network [OSTI]

    Orth, Melanie

    2011-01-01T23:59:59.000Z

    Saving the soil AgriLife units work to improve training terrain Story by Melanie Orth txH2O | pg. 9 Heavy tanks and armored vehicles that have continually rolled over the 67,000-acre West Range at Fort Hood for the past 60 years have...

  13. Saving the soil: AgriLife units work to improve traning terrain 

    E-Print Network [OSTI]

    Orth, Melanie

    2010-01-01T23:59:59.000Z

    Saving the soil AgriLife units work to improve training terrain Story by Melanie Orth txH2O | pg. 9 Heavy tanks and armored vehicles that have continually rolled over the 67,000-acre West Range at Fort Hood for the past 60 years have...

  14. GPS-FREE TERRAIN-BASED VEHICLE TRACKING PERFORMANCE AS A FUNCTION OF INERTIAL SENSOR CHARACTERISTICS

    E-Print Network [OSTI]

    Brennan, Sean

    and the requirement to maintain redundancy in vehicle automation and driver assist systems necessitatesGPS-FREE TERRAIN-BASED VEHICLE TRACKING PERFORMANCE AS A FUNCTION OF INERTIAL SENSOR-free or degraded-GPS environments, achieve vehicle tracking with tactical-grade inertial sensors. However

  15. How to use CFD for Wind in Terrain ... real-life experience!

    E-Print Network [OSTI]

    : · Turbulence modelling / numerical methods · Inclusion of wind turbine wake · Temperature stratification 2 study 3. Construction and operation 4. Wind turbine breakdown! 5. Wind measurements / CFD simulations1 How to use CFD for Wind in Terrain ... real-life experience! CFD day at Suzlon, October 2007 A

  16. Coupled Carbon/Water Fluxes in Complex Terrain, Water-Limited Forests Investigators

    E-Print Network [OSTI]

    Walden, Von P.

    Coupled Carbon/Water Fluxes in Complex Terrain, Water-Limited Forests Investigators: Karen Humes of quantifying the magnitude, timing, distribution and coupling of carbon and water fluxes in mountainous forestlands. This includes one segment of the continuum of carbon and water flow from the "forest to the sea

  17. The All Terrain Bio nano Gear for Space Radiation Detection System

    E-Print Network [OSTI]

    Mavroidis, Constantinos

    The All Terrain Bio nano Gear for Space Radiation Detection System Ajay Ummat, Constantinos and warn the astronaut of probable biological damage. A basic framework for radiation detection system which utilizes bio-nano machines is discussed. This radiation detection system is termed as "radiation

  18. An Experimental Investigation on the Wake Interference of Wind Turbines Sited Over Complex Terrains

    E-Print Network [OSTI]

    Hu, Hui

    1 An Experimental Investigation on the Wake Interference of Wind Turbines Sited Over Complex, 50011 An experimental study was conducted to investigate the interferences of wind turbines sited over conducted in a large wind tunnel with of wind turbine models sited over a flat terrain (baseline case

  19. Interactive terrain visualization enables virtual fieldwork during rapid scientific response to the 2010 Haiti earthquake

    E-Print Network [OSTI]

    Hamann, Bernd

    response to the 2010 Haiti earthquake --Manuscript Draft-- Manuscript Number: GS687R1 Full Title: Interactive terrain visualization enables virtual fieldwork during rapid scientific response to the 2010 Haiti earthquake Short Title: Virtual fieldwork, Haiti Article Type: Research Paper Keywords: Enriquillo fault

  20. Overland flow time of concentration on flat terrains

    E-Print Network [OSTI]

    Chibber, Paramjit

    2004-11-15T23:59:59.000Z

    /Duration...............................................................11 2.4.3 Surface Slope...................................................................................12 2.4.4 Roughness Coefficient/Flow Regime ..............................................12 2.4.5 Depression Storage..............................................................................17 2.4.6 Antecedent Moisture Content ..........................................................19 2.5 Stepwise Regression.....................................................................................20 3 METHODOLOGY...

  1. CITPUFF: a gaussian puff model for estimating pollutant concentration in complex terrain. Forest Service research paper

    SciTech Connect (OSTI)

    Ross, D.G.; Fox, D.G.; Dietrich, D.L.; Childs, J.E.; Marlatt, W.E.

    1985-07-01T23:59:59.000Z

    CITPUFF, is a puff-type dispersion model that uses a wind field calculated from a complex-terrain wind model. It accommodates a variety of source types including point, area, and line sources; calculates plume rise where applicable; and outputs a graphic display of puff trajectories and concentrations. The model is compared against models currently used for assessing air quality impacts in complex topography.

  2. Evaluation of Single-Doppler Radar Wind Retrievals in Flat and Complex Terrain

    SciTech Connect (OSTI)

    Newsom, Rob K.; Berg, Larry K.; Pekour, Mikhail S.; Fast, Jerome D.; Xu, Qin; Zhang, Pengfei; Yang, Qing; Shaw, William J.; Flaherty, Julia E.

    2014-08-01T23:59:59.000Z

    The accuracy of winds derived from NEXRAD level II data is assessed by comparison with independent observations from 915 MHz radar wind profilers. The evaluation is carried out at two locations with very different terrain characteristics. One site is located in an area of complex terrain within the State Line Wind Energy Center in northeast Oregon. The other site is located in an area of flat terrain on the east-central Florida coast. The National Severe Storm Laboratory’s 2DVar algorithm is used to retrieve wind fields from the KPDT (Pendleton OR) and KMLB (Melbourne FL) NEXRAD radars. Comparisons between the 2DVar retrievals and the radar profilers were conducted over a period of about 6 months and at multiple height levels at each of the profiler sites. Wind speed correlations at most observation height levels fell in the range from 0.7 to 0.8, indicating that the retrieved winds followed temporal fluctuations in the profiler-observed winds reasonably well. The retrieved winds, however, consistently exhibited slow biases in the range of1 to 2 ms-1. Wind speed difference distributions were broad with standard deviations in the range from 3 to 4 ms-1. Results from the Florida site showed little change in the wind speed correlations and difference standard deviations with altitude between about 300 and 1400 m AGL. Over this same height range, results from the Oregon site showed a monotonic increase in the wind speed correlation and a monotonic decrease in the wind speed difference standard deviation with increasing altitude. The poorest overall agreement occurred at the lowest observable level (~300 m AGL) at the Oregon site, where the effects of the complex terrain were greatest.

  3. Adding Complex Terrain and Stable Atmospheric Condition Capability to the Simulator for On/Offshore Wind Farm Applications (SOWFA) (Presentation)

    SciTech Connect (OSTI)

    Churchfield, M. J.

    2013-06-01T23:59:59.000Z

    This presentation describes changes made to NREL's OpenFOAM-based wind plant aerodynamics solver so that it can compute the stably stratified atmospheric boundary layer and flow over terrain. Background about the flow solver, the Simulator for Off/Onshore Wind Farm Applications (SOWFA) is given, followed by details of the stable stratification/complex terrain modifications to SOWFA, along with some preliminary results calculations of a stable atmospheric boundary layer and flow over a simple set of hills.

  4. Saving the soil: AgriLife units work to improve training terrain

    E-Print Network [OSTI]

    Orth, Melanie

    2011-01-01T23:59:59.000Z

    Saving the soil AgriLife units work to improve training terrain Story by Melanie Orth txH2O | pg. 9 Heavy tanks and armored vehicles that have continually rolled over the 67,000-acre West Range at Fort Hood for the past 60 years have... accelerated soil erosion. Fort Hood, the largest active duty armored post in the U.S. Armed Services and located near Killeen in central Texas, uses the range as the primary training and maneuver area for two armored divisions. The Texas Water...

  5. Final Report of the Grant: ''Vertical Transport and Mixing in Complex Terrain Airsheds''

    SciTech Connect (OSTI)

    Harindra Joseph Fernando James Anderson Don Boyer Neil Berman

    2004-12-29T23:59:59.000Z

    Stable stratification associated with nocturnal thermal circulation in areas of complex terrain leads to interesting and important phenomena that govern local meteorology and contaminant dispersion. Given that most urban areas are in complex topography, understanding and prediction of such phenomena are of immediate practical importance. This project dealt with theoretical, laboratory, numerical and field experimental studies aimed at understanding stratified flow and turbulence phenomena in urban areas, with particular emphasis on flow, turbulence and contaminant transport and diffusion in such flows. A myriad of new results were obtained and some of these results were used to improve the predictive capabilities of the models.

  6. 11.1 DEVELOPMENT OF AN IMMERSED BOUNDARY METHOD TO RESOLVE COMPLEX TERRAIN IN THE WEATHER RESEARCH AND FORECASTING MODEL

    E-Print Network [OSTI]

    Chow, Fotini Katopodes

    11.1 DEVELOPMENT OF AN IMMERSED BOUNDARY METHOD TO RESOLVE COMPLEX TERRAIN IN THE WEATHER RESEARCH AND FORECASTING MODEL Katherine A. Lundquist1 , Fotini K. Chow 2 , Julie K. Lundquist 3 , and Jeffery D. Mirocha 3 in urban areas are profoundly influenced by the presence of build- ings which divert mean flow, affect

  7. A Survey of Procedural Methods for Terrain Modelling Ruben M. Smelik, Klaas Jan de Kraker and Saskia A. Groenewegen

    E-Print Network [OSTI]

    Bidarra, Rafael

    such as terrain elevation and growth of plants in the 1980s and 1990s and extended its focus to urban environments or not at all. The integration and adjustment of existing procedural methods in such a way that they can Research (NWO) and the Netherlands ICT Research and Innovation Authority (ICT Regie). #12;current modelling

  8. Tornadoes over complex terrain: an analysis of the 28th August 1999 tornadic event in eastern Spain

    E-Print Network [OSTI]

    Romero, Romu

    Tornadoes over complex terrain: an analysis of the 28th August 1999 tornadic event in eastern Spain Fi´sica, Universitat de les Illes Balears, Palma de Mallorca 07071, Spain b Instituto Nacional de Meteorologi´a, Centre Meteorolo`gic a les Illes Balears, Palma de Mallorca, Spain c IMEDEA, UIB-CSIC, Palma de

  9. Rear-Projecting Virtual Data onto Physical Terrain: An Exercise in Two Senses Being Better Than One

    E-Print Network [OSTI]

    Bailey, Mike

    a computer-displayed 3D terrain map were not sufficient. We wanted to create more insight data set for POW that could be used for the 3D model, we had to merge seven USGS quads (Figure 3): Port shuttle (courtesy of the Earthrise project) showing POW Island from 182 nautical miles. Figure 2: POW

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

    E-Print Network [OSTI]

    Florida, University of

    Development of an Integrated Sensor System for Obstacle Detection and Terrain Evaluation field of view of 50 degrees and 38 degrees, respectively. Two sensor systems were utilized to evaluate., Wexford Pennsylvania ABSTRACT This paper describes the development and performance of a sensor system

  11. The new WAsP flow model: a fast, linearized Mixed Spectral-Integration model applicable to complex terrain

    E-Print Network [OSTI]

    . There is interest in placing wind turbines in hilly and mountainous areas, due to the potentially high speed commercial PC-based tool to estimate wind resources at a potential wind turbine site, given a set of wind challenge for the wind energy industry is the prediction of the wind resource in complex terrain

  12. Innovative Gamma Ray Spectrometer Detection Systems for Conducting Scanning Surveys on Challenging Terrain - 13583

    SciTech Connect (OSTI)

    Palladino, Carl; Mason, Bryan; Engle, Matt; LeVangie, James [The Palladino Company, Inc., 720 Fillmore St., San Francisco, CA 94117 (United States)] [The Palladino Company, Inc., 720 Fillmore St., San Francisco, CA 94117 (United States); Dempsey, Gregg [United States Environmental Protection Agency, P.O. Box 98517, Las Vegas, NV 89193-8517 (United States)] [United States Environmental Protection Agency, P.O. Box 98517, Las Vegas, NV 89193-8517 (United States); Klemovich, Ron [HydroGeoLogic, Inc., 6340 Glenwood, Suite 200, Building No. 7, Overland Park, KS 66202 (United States)] [HydroGeoLogic, Inc., 6340 Glenwood, Suite 200, Building No. 7, Overland Park, KS 66202 (United States)

    2013-07-01T23:59:59.000Z

    The Santa Susana Field Laboratory located near Simi Valley, California was investigated to determine the nature and extent of gamma radiation anomalies. The primary objective was to conduct gamma scanning surveys over 100 percent of the approximately 1,906,000 square meters (471 acre) project site with the most sensitive detection system possible. The site had challenging topography that was not conducive to traditional gamma scanning detection systems. Terrain slope varied from horizontal to 48 degrees and the ground surface ranged from flat, grassy meadows to steep, rocky hillsides. In addition, the site was home to many protected endangered plant and animal species, and archaeologically significant sites that required minimal to no disturbance of the ground surface. Therefore, four innovative and unique gamma ray spectrometer detection systems were designed and constructed to successfully conduct gamma scanning surveys of approximately 1,076,000 square meters (266 acres) of the site. (authors)

  13. Shear Wave Velocity Structure of Southern African Crust: Evidence for Compositional Heterogeneity within Archaean and Proterozoic Terrains

    SciTech Connect (OSTI)

    Kgaswane, E M; Nyblade, A A; Julia, J; Dirks, P H H M; Durrheim, R J; Pasyanos, M E

    2008-11-11T23:59:59.000Z

    Crustal structure in southern Africa has been investigated by jointly inverting receiver functions and Rayleigh wave group velocities for 89 broadband seismic stations spanning much of the Precambrian shield of southern Africa. 1-D shear wave velocity profiles obtained from the inversion yield Moho depths that are similar to those reported in previous studies and show considerable variability in the shear wave velocity structure of the lower part of the crust between some terrains. For many of the Archaean and Proterozoic terrains in the shield, S velocities reach 4.0 km/s or higher over a substantial part of the lower crust. However, for most of the Kimberley terrain and adjacent parts of the Kheis Province and Witwatersrand terrain, as well as for the western part of the Tokwe terrain, mean shear wave velocities of {le} 3.9 km/s characterize the lower part of the crust along with slightly ({approx}5 km) thinner crust. These findings indicate that the lower crust across much of the shield has a predominantly mafic composition, except for the southwest portion of the Kaapvaal Craton and western portion of the Zimbabwe Craton, where the lower crust is intermediate-to-felsic in composition. The parts of the Kaapvaal Craton underlain by intermediate-to-felsic lower crust coincide with regions where Ventersdorp rocks have been preserved, and thus we suggest that the intermediate-to-felsic composition of the lower crust and the shallower Moho may have resulted from crustal melting during the Ventersdorp tectonomagmatic event at c. 2.7 Ga and concomitant crustal thinning caused by rifting.

  14. Wind Regimes in Complex Terrain of the Great Valley of Eastern Tennessee

    SciTech Connect (OSTI)

    Birdwell, Kevin R [ORNL

    2011-05-01T23:59:59.000Z

    This research was designed to provide an understanding of physical wind mechanisms within the complex terrain of the Great Valley of Eastern Tennessee to assess the impacts of regional air flow with regard to synoptic and mesoscale weather changes, wind direction shifts, and air quality. Meteorological data from 2008 2009 were analyzed from 13 meteorological sites along with associated upper level data. Up to 15 ancillary sites were used for reference. Two-step complete linkage and K-means cluster analyses, synoptic weather studies, and ambient meteorological comparisons were performed to generate hourly wind classifications. These wind regimes revealed seasonal variations of underlying physical wind mechanisms (forced channeled, vertically coupled, pressure-driven, and thermally-driven winds). Synoptic and ambient meteorological analysis (mixing depth, pressure gradient, pressure gradient ratio, atmospheric and surface stability) suggested up to 93% accuracy for the clustered results. Probabilistic prediction schemes of wind flow and wind class change were developed through characterization of flow change data and wind class succession. Data analysis revealed that wind flow in the Great Valley was dominated by forced channeled winds (45 67%) and vertically coupled flow (22 38%). Down-valley pressure-driven and thermally-driven winds also played significant roles (0 17% and 2 20%, respectively), usually accompanied by convergent wind patterns (15 20%) and large wind direction shifts, especially in the Central/Upper Great Valley. The behavior of most wind regimes was associated with detectable pressure differences between the Lower and Upper Great Valley. Mixing depth and synoptic pressure gradients were significant contributors to wind pattern behavior. Up to 15 wind classes and 10 sub-classes were identified in the Central Great Valley with 67 joined classes for the Great Valley at-large. Two-thirds of Great Valley at-large flow was defined by 12 classes. Winds flowed on-axis only 40% of the time. The Great Smoky Mountains helped create down-valley pressure-driven winds, downslope mountain breezes, and divergent air flow. The Cumberland Mountains and Plateau were associated with wind speed reductions in the Central Great Valley, Emory Gap Flow, weak thermally-driven winds, and northwesterly down sloping. Ridge-and-valley terrain enhanced wind direction reversals, pressure-driven winds, as well as locally and regionally produced thermally-driven flow.

  15. Spotlight SAR interferometry for terrain elevation mapping and interferometric change detection

    SciTech Connect (OSTI)

    Eichel, P.H.; Ghiglia, D.C.; Jakowatz, C.V. Jr. [and others

    1996-02-01T23:59:59.000Z

    In this report, we employ an approach quite different from any previous work; we show that a new methodology leads to a simpler and clearer understanding of the fundamental principles of SAR interferometry. This methodology also allows implementation of an important collection mode that has not been demonstrated to date. Specifically, we introduce the following six new concepts for the processing of interferometric SAR (INSAR) data: (1) processing using spotlight mode SAR imaging (allowing ultra-high resolution), as opposed to conventional strip-mapping techniques; (2) derivation of the collection geometry constraints required to avoid decorrelation effects in two-pass INSAR; (3) derivation of maximum likelihood estimators for phase difference and the change parameter employed in interferometric change detection (ICD); (4) processing for the two-pass case wherein the platform ground tracks make a large crossing angle; (5) a robust least-squares method for two-dimensional phase unwrapping formulated as a solution to Poisson`s equation, instead of using traditional path-following techniques; and (6) the existence of a simple linear scale factor that relates phase differences between two SAR images to terrain height. We show both theoretical analysis, as well as numerous examples that employ real SAR collections to demonstrate the innovations listed above.

  16. Cite as: Lundquist, J.K., F. K. Chow, J. D. Mirocha, and K.A. Lundquist, 2007: An Improved WRF for Urban-Scale and Complex-Terrain Applications. American Meteorological Society's 7

    E-Print Network [OSTI]

    Chow, Fotini Katopodes

    method (IBM) approach to account for the effects of urban geometries and complex terrain. Companion of flow and dispersion in complex geometries such as urban areas, as well as new simulation capabilities for Urban-Scale and Complex-Terrain Applications. American Meteorological Society's 7 th Symposium

  17. The Complexity of Rivers in Triangulated Terrains Pankaj Agarwal 1 Mark de Berg 2 Prosenjit Bose 3 Katrin Dobrint 2 Marc van Kreveld 2

    E-Print Network [OSTI]

    Bose, Prosenjit

    The Complexity of Rivers in Triangulated Terrains Pankaj Agarwal 1 Mark de Berg 2 Prosenjit Bose 3 \\Theta(n 3 ) worst­case complexity, where complexity is measured in the number of line segments that make into the stream. Road building, logging, or other activities carried out in a watershed all have the potential

  18. Proceedings IEEE Visualization '99, pages 291298, cIEEE Computer Society Press, 1999. LOD-Sprite Technique for Accelerated Terrain Rendering

    E-Print Network [OSTI]

    Swan II, J. Edward

    -Sprite Technique for Accelerated Terrain Rendering Baoquan Chen½ SUNY at Stony Brook J. Edward Swan II¾ Naval rendering technique, termed LOD-sprite render- ing, which uses a combination of a level-of-detail (LOD) represen- tation of the scene together with reusing image sprites (previously rendered images). Our primary

  19. Analysis, design, and control of an omnidirectional mobile robot in rough terrain

    E-Print Network [OSTI]

    Udengaard, Martin Richard

    2008-01-01T23:59:59.000Z

    An omnidirectional mobile robot is able, kinematically, to move in any direction regardless of current pose. To date, nearly all designs and analyses of omnidirectional mobile robots have considered the case of motion on ...

  20. Parallelized Distributed Embedded Control System for 2D Walking Robot for Studying Rough Terrain Locomotion

    E-Print Network [OSTI]

    Strunk, Gavin

    2010-12-10T23:59:59.000Z

    C Bus…………………………………….31 3.3 Jaywalker GUI…………………………………………………………...38 4. JAYWALKER TESTING……………………………………………………….41 4.1 Motor Ramping…………………………………………………………..41 4.2 Range of Motion…………………………………………………………42 4.3 Data Acquisition…………………………………………………………42... cylinders…………………………………………………………..53 Figure B.4.1: Propeller wiring diagram with EEPROM and connectors corresponding to the Sensor Controller connectors………………………….54 Figure B.4.2: Regulator power source provided +3.3 VDC and +5 VDC for the Foot...

  1. Similarity Dimension of a Glaciated Terrain

    E-Print Network [OSTI]

    Jackson, Daniel R.

    rate of movement. #12;Data Acquisition · The topography of a formerly glaciated surface the proportionality constant b from the previous equation. #12;Application to Topography · The topography of a region, it becomes possible to evaluate the length and similarity dimension of topography as Richardson

  2. Modles Numriques de Terrain Interpolation Numrique

    E-Print Network [OSTI]

    Delacourt, Christophe

    Scanner : http://www.riegl.com/ Scanner photogrammétrique : http://atm3d.free.fr/v5/html : Interférométrie : SRTM (Shuttle Radar Topography Mission) : http://srtm.csi.cgiar.org Interférométrie Radar multi

  3. Pattern classification of terrain during amputee walking

    E-Print Network [OSTI]

    Farrell, Matthew Todd

    2013-01-01T23:59:59.000Z

    In this thesis I study the role of extrinsic (sensors placed on the body) versus intrinsic sensing (instruments placed on an artificial limb) and determine a robust set of sensors from physical and reliability constraints ...

  4. Asynchronous deterministic rendezvous in bounded terrains$

    E-Print Network [OSTI]

    Ilcinkas, David

    . c LIF, Universit´e de Provence, 13453 Marseille, France. Abstract Two mobile agents (robots) have. Robots are modeled as points, and each of them is equipped with a compass. Compasses of robots may be incoherent. Robots construct their routes, but the actual walk of each robot is decided by the adversary

  5. Adaptive Resampling for Mobile, Real-Time Terrain

    E-Print Network [OSTI]

    Mower, James E.

    TinVariance scans the high-res TIN, searching for samples that exceed the variable local tolerance Scanning works about 3 minutes on a 700 mHz laptop #12;LocalTinVariance Speed Factors Worst-case performance is linear, triangular decomposition of a grid GridToTinVT adds a variable tolerance increasing with distance from

  6. FLIGHT TEST RESULTS OF THE CONTROLLED FLIGHT INTO TERRAIN

    E-Print Network [OSTI]

    Ladkin, Peter B.

    versus soft Fly-By-Wire (FBW) flight control systems. To obtain this data, simulated CFIT avoidance........................................................................................................................................2 B. Ground Proximity Warning Systems

  7. High-Resolution Aeromagnetic Mapping Of Volcanic Terrain, Yellowstone...

    Open Energy Info (EERE)

    anomalies coincides with the mapped extent of several post-caldera rhyolitic lavas. Linear magnetic anomalies reflect the rectilinear fault systems characteristic of...

  8. Ultrasensitive directional microphone arrays for military operations in urban terrain.

    SciTech Connect (OSTI)

    Hall, Neal A.; Peterson, Kenneth Allen; Parker, Eric Paul; Resnick, Paul James; Okandan, Murat; Serkland, Darwin Keith

    2007-11-01T23:59:59.000Z

    Acoustic sensing systems are critical elements in detection of sniper events. The microphones developed in this project enable unique sensing systems that benefit significantly from the enhanced sensitivity and extremely compact foot-print. Surface and bulk micromachining technologies developed at Sandia have allowed the design, fabrication and characterization of these unique sensors. We have demonstrated sensitivity that is only available in 1/2 inch to 1 inch studio reference microphones--with our devices that have only 1 to 2mm diameter membranes in a volume less than 1cm{sup 3}.

  9. Near Time-optimal Constrained Trajectory Planning on Outdoor Terrain

    E-Print Network [OSTI]

    Sukhatme, Gaurav S.

    interactions are usually unaccounted for. Kinodynamic planning in real-time is also difficult and currently

  10. Topological Landscapes: A Terrain Metaphor for Scientific Data

    E-Print Network [OSTI]

    Weber, Gunther H.; Bremer, Peer-Timo; Pascucci, Valerio

    2007-01-01T23:59:59.000Z

    engine and nu- cleon datasets. In both cases considerations similar to those for the hydrogenengine dataset and the largest average error (error weighted by size of the area) is 1.4% for the hydrogen

  11. Learning to visually predict terrain properties for planetary rovers

    E-Print Network [OSTI]

    Brooks, Christopher Allen, 1978-

    2009-01-01T23:59:59.000Z

    For future planetary exploration missions, improvements in autonomous rover mobility have the potential to increase scientific data return by providing safe access to geologically interesting sites that lie in rugged ...

  12. Benthic Terrain Modeler: Interpreting the Bathymetric Environment Shaun Walbridge1

    E-Print Network [OSTI]

    Wright, Dawn Jeannine

    interactively with an environment such as IPython 6 . Finally, the project now includes an extensive testing

  13. Resisting globalization- ATTAC in France: local discourses, global terrain

    E-Print Network [OSTI]

    Leonard, Marie des Neiges

    2007-04-25T23:59:59.000Z

    The debate over the "globalization" process has been influenced by the emergence of social movements who deplore this process. This research focuses on the French social movement ATTAC (Action for a Tobin Tax for the Aid of Citizens...

  14. Intelligent terrain avoidance agent for General Aviation Free Flight

    E-Print Network [OSTI]

    Gesting, Paul

    2013-02-22T23:59:59.000Z

    In order to reduce the workload of Air Traffic Controllers, a new concept called Free Flight has emerged for General Aviation. This system takes the load off of the air traffic controller and puts the responsibility on the pilot. In order to help...

  15. Soil Moisture Measurement in Heterogeneous Terrain Merlin, O.1

    E-Print Network [OSTI]

    Walker, Jeff

    , uncertainty assessment, soil moisture patterns. EXTENDED ABSTRACT Reliable soil moisture measurement over such data, portable electronic sensors offer a practical alternative to gravimetric measurements % v/v in clay. On the other hand, the real component of the measured relative DC is found to be more

  16. Terrain relative localization for lunar entry, descent, and landing

    E-Print Network [OSTI]

    Hale, Matthew J., S.M. Massachusetts Institute of Technology

    2007-01-01T23:59:59.000Z

    As exploration of the solar system continues, the need for the capability to land a spacecraft very accurately on a planetary body has become apparent. Due to limitations on the achievable accuracy of inertial navigation ...

  17. ASRS Database Report Set Controlled Flight Toward Terrain

    E-Print Network [OSTI]

    be limited. The National Aeronautics and Space Administration and its ASRS current contractor, Booz Allen Hamilton, specifically disclaim any responsibility for any interpretation which may be made by others

  18. Walking and Running of a Quadruped Robot on Irregular Terrain

    E-Print Network [OSTI]

    Kimura, Hiroshi

    -Communications Tokyo, Japan #12;2 Aichi Expo. Prototype Robot Exhib. Jun.9-19, 2005 House keeping dog in a garden (rush bound of the cyclic period of walking TomCat [Jul. 2003] #12;11 Passive Dynamic Walking A walking CPG? ·passive dynamic walk ·spring-damper neural system model (CPG + reflexes) passive dynamics

  19. Hydrological Evaluation of Septic Disposal Field Design in Sloping Terrains

    E-Print Network [OSTI]

    Walter, M.Todd

    . Steenhuis7 Abstract: The most common form of onsite domestic wastewater treatment in the United States; Slopes; Wastewater treatment; Waste disposal. Introduction The most common form of onsite wastewater treatment is the septic system Wastewater 1991 . Over 50 million people in the United States use septic

  20. Mythical Terrain and the Building of Mexico’s UNAM

    E-Print Network [OSTI]

    Davids, René

    2008-01-01T23:59:59.000Z

    and the Environment in Mexico, 2005. No. 14: Kevin P.Trueba, El Pedregal de San Angel. Mexico City: UniversidadNacional Autónoma de Mexico (1995). 5. See Mario Pani and

  1. High-Resolution Aeromagnetic Mapping Of Volcanic Terrain, Yellowstone

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are8COaBulkTransmissionSitingProcess.pdfGetecGtel Jump to: navigation, search Name:HidraliaWells Geothermal

  2. PRODUCING SATELLITE-DERIVED IRRADIANCES IN COMPLEX ARID TERRAIN

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere I Geothermal Pwer PlantMunhall,Missouri:EnergyOssian, New York:Ozark, Alabama:ASES 2003, Austin TX and

  3. Outline DARTS lab Introduction SimScape Large terrain modeling CLOD visualization Conclusion Scalable Large, Multi-Resolution Terrain

    E-Print Network [OSTI]

    -Time Simulation (DARTS) EDL simulations (DSENDS) Rover simulations (ROAMS) Airship simulations Robotic arm

  4. Survey of Terrain Guarding and Art Gallery The terrain guarding problem and art gallery problem are two ar-

    E-Print Network [OSTI]

    Krohn, Erik

    show how this strategy has to be changed for molecules with a large hyperpolarizability. Finally, we 2

  5. Design of robotic quadruped legs

    E-Print Network [OSTI]

    McKenzie, Jacob Elijah

    2012-01-01T23:59:59.000Z

    Prized for their performance on prepared surfaces, wheeled vehicles are often limited in mobility by rough and unstructured terrain. Conversely, systems that rely on legs have shown promising rough terrain performance but ...

  6. Controlling rough paths

    E-Print Network [OSTI]

    2013-03-05T23:59:59.000Z

    original work of Lyons [7] roughness is measured in p-variation norm, instead here we prefer to .... e.g. for cochains A; B of degree 1 and 2 respectively, we have.

  7. Effects of climate, physical erosion, parent mineralogy, and dust on chemical erosion rates in mountainous terrain

    E-Print Network [OSTI]

    Ferrier, Ken

    2009-01-01T23:59:59.000Z

    Bryan, K. , 1927. The ”Palouse soil” problem. USGS Bulletinin the Channeled Scablands and Palouse of Washington State.dust-producing engine of the Palouse loess, USA. Quaternary

  8. The coupled development of terrain and vegetation : the case of semiarid grasslands

    E-Print Network [OSTI]

    Flores Cervantes, Javier Homero, 1977-

    2010-01-01T23:59:59.000Z

    The distribution of vegetation in semiarid landscapes organizes as a function of moisture availability, which is often mediated by the form of the land surface. Simultaneously the processes that shape the land surface are ...

  9. Optimal Complete Terrain Coverage using an Unmanned Aerial Vehicle Anqi Xu, Chatavut Viriyasuthee, and Ioannis Rekleitis

    E-Print Network [OSTI]

    Rekleitis, Ioannis

    in a bounded environment, while: · avoiding a set of obstacle regions with arbitrary shape · preventing from of coverage using an aerial vehicle has many applications, including: environmental inspection, search] for the general class of non-holonomic robots. We compute a set of waypoints outlining the desired cover- age path

  10. Coastal Wave Generation and Wave Breaking over Terrain: Two Problems in Mesoscale Wave Dynamics 

    E-Print Network [OSTI]

    Qian, Tingting

    2010-07-14T23:59:59.000Z

    Two problems in mesoscale wave dynamics are addressed: (i) wave-turbulence interaction in a breaking mountain wave and (ii) gravity wave generation associated with coastal heating gradients. The mean and turbulent structures in a breaking mountain...

  11. Measurement of advection and surface-atmosphere exchange in complex terrain

    E-Print Network [OSTI]

    Jones, Kevin H.

    Accurate observations of the carbon cycle are essential as inputs to global climate models. Observations made by the micrometeorological technique of eddy covariance, whist widespread, may be incorrect if air is advected ...

  12. A Benthic Terrain Classification Scheme for American Samoa Accepted for publication in Marine Geodesy, 2006

    E-Print Network [OSTI]

    Wright, Dawn Jeannine

    , invasive species, security training activities, offshore oil and gas exploration, and coral bleaching on earth, continually face destruction from anthropogenic and natural threats. The U.S. Coral Reef Task to increasing coastal populations (Culliton 1998). Natural and anthropogenic processes threaten natural

  13. Effects of climate, physical erosion, parent mineralogy, and dust on chemical erosion rates in mountainous terrain

    E-Print Network [OSTI]

    Ferrier, Ken

    2009-01-01T23:59:59.000Z

    kinetics. In: Reviews in Mineralogy. Vol. 31 of Developmentsthe tropical North Atlantic – Mineralogy. Marine Geology 37,and single-particle mineralogy of a thick Chinese loess-

  14. Terrain and vegetation structural influences on local avian species richness in two mixed-conifer forests

    E-Print Network [OSTI]

    avian species richness in two mixed conifer forests, Moscow Mountain and Slate Creek, containing included height variability and canopy density whereas at Slate Creek they included slope, elevation, patch at Moscow Mountain but were strong predictors of avian species richness at the higher elevation Slate Creek

  15. all-terrain vehicle injuries: Topics by E-print Network

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

    and efficiency can be observed depending on the size of compressors. Typically, a larger compressor results in higher fuel cell power density at the cost of fuel cell efficiency...

  16. all-terrain vehicle accidents: Topics by E-print Network

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

    Accident Investigation 33 Nighttime Analysis 34 Before-and-After Study with Control Odds Ratio 34 35 Nighttime Investigation Results 40 Evaluation of Intersections with Zero...

  17. all-terrain vehicle crashes: Topics by E-print Network

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

    This strains electrical grid components, especially low-voltage transformers which can overheat and fail while serving consumers ' homes. Meanwhile, the EVs ' electrical storage...

  18. The Inverting Effect of Curvature in Winter Terrain Park Jump Takeoffs J. A. McNeil

    E-Print Network [OSTI]

    especially hazardous situation is when the jumper lands in an inverted position which can lead as "intrinsic" to snowboarding. The National Ski Areas Association reported approximately 16 million snowboarder

  19. Low Altitude Wind Simulation Over Mount Saint Helens Using NASA SRTM Digital Terrain Model

    E-Print Network [OSTI]

    Alberta, University of

    . Using a new radar sweep- ing technique most of the Earth's surfaces was digitized in 3D in approximately Medellin, Colombia Edmonton, Alberta, Canada T6J 2E8 Abstract On February 11, 2000, the Shuttle Radar Topography Mis- sion (SRTM) was launched into space as part of one of the payload of the Shuttle Endeavor

  20. Mapping textures on 3d terrains: a hybrid cellular automata approach 

    E-Print Network [OSTI]

    Sinvhal, Swapnil

    2007-04-25T23:59:59.000Z

    generated by cellular automata has been studied by Crutchfield et al. [16] and Melanie et al. [60], [61]. A ?chaotic? system has been described [99] as one in which ?activity doesn't die down into a regular pattern, but yet it also doesn't explode all... volumetric data structure to simulate weathering of stone incorporating effects like flow of moisture and mineral dissolution. Jensen et al. [62] illustrate the rendering of wet materials by taking into account the water on the surface and a concentration...

  1. Estimating the spatial and temporal distribution of snow in mountainous terrain

    E-Print Network [OSTI]

    Musselman, Keith Newton

    2012-01-01T23:59:59.000Z

    beam radiation. At every photo / depth sensor location,2.4b but at all 24 photo / snow depth sensor locations isless than the photo-derived 24-sensor mean SVF 90° (0.24;

  2. The chaotic terrain of Elysium Planitia, Mars: a mapping and geomorphic analysis

    E-Print Network [OSTI]

    Roberts, Sara Layne

    1988-01-01T23:59:59.000Z

    ]. If an ice-rich permafrost exists, then geomorphic processes associated with frozen ground, such as frost heav- ing, ice or sand wedging, creep and patterned ground may also exist [Carr and Schaber, 1977; Lucchitta, 1981; Hel- fenstein, 1980; Nummedal... wedging and frost heaving [Anderson et al. , 1973; aossbacher and Judson, 1981; Wade and oe Wys, 1968; Sharp, 1973]. Thawing and sublimation of exposed ground ice may also explain the deep troughs [Carr and Schaber, 1977]. Additional mechanisms may...

  3. INVESTIGATION OF A DYNAMIC POWER LINE RATING CONCEPT FOR IMPROVED WIND ENERGY INTEGRATION OVER COMPLEX TERRAIN

    SciTech Connect (OSTI)

    Jake P. Gentle; Kurt S Myers; Tyler B Phillips; Inanc Senocak; Phil Anderson

    2014-08-01T23:59:59.000Z

    Dynamic Line Rating (DLR) is a smart grid technology that allows the rating of power line to be based on real-time conductor temperature dependent on local weather conditions. In current practice overhead power lines are generally given a conservative rating based on worst case weather conditions. Using historical weather data collected over a test bed area, we demonstrate there is often additional transmission capacity not being utilized with the current static rating practice. We investigate a new dynamic line rating methodology using computational fluid dynamics (CFD) to determine wind conditions along transmission lines at dense intervals. Simulated results are used to determine conductor temperature by calculating the transient thermal response of the conductor under variable environmental conditions. In calculating the conductor temperature, we use both a calculation with steady-state assumption and a transient calculation. Under low wind conditions, steady-state assumption predicts higher conductor temperatures that could lead to curtailments, whereas transient calculations produce conductor temperatures that are significantly lower, implying the availability of additional transmission capacity.

  4. The research and design of a low cost, all terrain, mechanically advantageous wheelchair for developed markets

    E-Print Network [OSTI]

    Judge, Benjamin Michael

    2011-01-01T23:59:59.000Z

    This thesis presents a case for a paradigm shift in the way mobility technology is approached in the United States. Spawning from the research of developing world wheelchair technology, a conceptual design for a capable ...

  5. Estimating the spatial and temporal distribution of snow in mountainous terrain

    E-Print Network [OSTI]

    Musselman, Keith Newton

    2012-01-01T23:59:59.000Z

    and McMillen, R.T. , 1984. Solar radiation within an oak--J.P. et al. , 2004. Solar radiation transmission through1992. Analysis of solar radiation data for Port Harcourt,

  6. Submitted for Publication to SOLAR ENERGY PRODUCING SATELLITE-DERIVED IRRADIANCES IN COMPLEX ARID TERRAIN

    E-Print Network [OSTI]

    Perez, Richard R.

    Submitted for Publication to SOLAR ENERGY PRODUCING SATELLITE-DERIVED IRRADIANCES IN COMPLEX ARID spectrum. #12;Submitted for Publication to SOLAR ENERGY In its simplest description the model amounts wavelengths in the visible spectral range (0.55-0.75 µm) corresponding to the peak of the solar radiation

  7. Calibration, Terrain Reconstruction and Path Planning for a Planetary Exploration System

    E-Print Network [OSTI]

    Pollefeys, Marc

    and localization of the rover. The lat- ter makes use of four Light Emitting Diodes on the rover payload cab

  8. Surface Stresses and Turbulent Fluxes: Problems in Mesoscale Modeling over Terrain

    E-Print Network [OSTI]

    : Turbulent mixing in breaking waves (Epifanio and Qian, 2008) LES for breaking mountain wave Flow past a hill) = Dx Ly (u, v, w) = Dy One kinematic condition (no flow through the boundary): w = u h x + v h y at the boundary and combine with the kinematic condition Lx ui,j,0 vi,j,0 wi,j,0 = f (Dx i,j , interior) , Ly

  9. all-terrain lunar exploration: Topics by E-print Network

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

    behind changes in the lunar exosphere when the Moon passes through the penumbra and umbra of the Earth during a lunar eclipse. The dusty turbulent environment due to planetary...

  10. Online Submission ID: vis-1177 Analyzing Terrain Surfaces to Synthesize and Visualize

    E-Print Network [OSTI]

    Bailey, Mike

    abut each other, so that no land is wasted on gaps and no fuel is wasted on overlapping areas neural equation. A complete coverage tractor path is autonomously generated from the dynamic activity. If they are "too close" together, plowed areas of the field will overlap and waste fuel. Also, too much overlap

  11. Effects of climate, physical erosion, parent mineralogy, and dust on chemical erosion rates in mountainous terrain

    E-Print Network [OSTI]

    Ferrier, Ken

    2009-01-01T23:59:59.000Z

    pit mine, and in 1948 a smelter was added to the site. It isor as finer particles in smelter stack emissions. We have

  12. High compliance all-terrain transport and heavy cargo hybrid bicycle

    E-Print Network [OSTI]

    Pino, Andres (Andres J.)

    2006-01-01T23:59:59.000Z

    This research involved the design and manufacture of a prototype for a hybrid bicycle system. The design called for a vehicle capable of being used in a mode where normal bicycle operation is possible while being reconfigurable ...

  13. High compliance all-terrain transport and heavy cargo hybrid bicycle

    E-Print Network [OSTI]

    Soto-Fernández, Orlando

    2005-01-01T23:59:59.000Z

    A design project was carried out which involved the design, manufacturing, and assembly of a hybrid bicycle. The bicycle was required to operate between two modes, one that permitted fast transport of the operator from one ...

  14. Coastal Wave Generation and Wave Breaking over Terrain: Two Problems in Mesoscale Wave Dynamics

    E-Print Network [OSTI]

    Qian, Tingting

    2010-07-14T23:59:59.000Z

    Two problems in mesoscale wave dynamics are addressed: (i) wave-turbulence interaction in a breaking mountain wave and (ii) gravity wave generation associated with coastal heating gradients. The mean and turbulent structures in a breaking mountain...

  15. The effects of cultural noise on controlled source electromagnetic resonses of subsurface fractures in resistive terrain

    E-Print Network [OSTI]

    Fernandes, Roland Anthony Savio

    2009-05-15T23:59:59.000Z

    conductors such as metal fences and buried pipes. Cultural noise adds an element of complexity to the geological interpretation of this type of data. This research investigates the influence of mutual induction between two buried targets in a CSEM experiment...

  16. The Great Circuit: Finding the Longest Great Circle With Respect to Terrain

    E-Print Network [OSTI]

    French, Keith

    2006-11-15T23:59:59.000Z

    at approximate 2 minute intervals (to match ETOPO 2 resolution). #0;9Using elevation data from ETOPO, calculate surface distance. #0;9Keep track of longest and shortest circles. #0;9Export circles as shapefiles. Results Sea Floor Results Sea Surface Sea...

  17. Effects of climate, physical erosion, parent mineralogy, and dust on chemical erosion rates in mountainous terrain

    E-Print Network [OSTI]

    Ferrier, Ken

    2009-01-01T23:59:59.000Z

    Acta 40 (1), 41–49. Buss, H. L. , Bruns, M. A. , Schultz, M.Geobiology 3, 247–260. Buss, H. L. , Sak, P. B. , Webb, S.1025–1038. Fletcher, R. C. , Buss, H. L. , Brantley, S. L. ,

  18. Live Webinar on the Funding Opportunity for Wind Forecasting Improvement Project in Complex Terrain

    Broader source: Energy.gov [DOE]

    On April 21, 2014 from 3:00 to 5:00 PM EST the Wind Program will hold a live webinar to provide information to potential applicants for this Funding Opportunity Announcement. There is no cost to...

  19. Multicriteria design of rain gauge networks for flash flood prediction in semiarid catchments with complex terrain

    E-Print Network [OSTI]

    Troch, Peter

    events. Using weather radar observations and a dense network of 40 tipping bucket rain gauges, this studyMulticriteria design of rain gauge networks for flash flood prediction in semiarid catchments. [1] Despite the availability of weather radar data at high spatial (1 km2 ) and temporal (5­15 min

  20. Analysis of flat terrain for the Atlas robot Maarten de Waard, Maarten Inja, and Arnoud Visser

    E-Print Network [OSTI]

    Visser, Arnoud

    of a humanoid can be placed. This will allow apply such robot in a rescue scenario, as foreseen in the DARPA, human-engineered environ- ments. Competitors in the DRC are expected to focus on robots that can use is the Atlas, a bipedal human sized robot, shown in figure 1. The Atlas robot is a continuation

  1. Drying Rough Rice in Storage.

    E-Print Network [OSTI]

    Sorenson, J. W. Jr.; Crane, L. E.

    1960-01-01T23:59:59.000Z

    Drying. Rough Rice in Storage Ih AGRf""' TURP YPERIMENT STAT10 I. TEXAS SUMMARY Research was conducted at the Rice-Pasture Experiment Station near Beaumont during 7 crop years (1952-53 through 1958-59) to determine the engineering problems... and the practicability of dry- ing rough rice in storage in Texas. Drying rice in storage means drying rice in the same bin in which it is to be stored. Rough rice, with initial moisture contents of 15.0 to 23.0 percent, was dried at depths of 4 to 10 feet...

  2. EuroCG 2010, Dortmund, Germany, March 2224, 2010 Guarding 1.5D Terrains with Demands

    E-Print Network [OSTI]

    Matijevic, Domagoj

    , Croatia, domagoj AT mathos.hr Department of Mathematics, J.J. Strossmayer University, Osijek, Croatia

  3. Immersed Boundary Methods for High-Resolution Simulation of Atmospheric Boundary-Layer Flow Over Complex Terrain

    E-Print Network [OSTI]

    Lundquist, Katherine Ann

    2010-01-01T23:59:59.000Z

    laminar flow over a ribbed channel. v ? U n F = + U · ?U + ?dimensional channel flow with smooth and ribbed surfaces. In

  4. New active safety device dedicated to light all-terrain vehicle stability: Application to quad bike and off-road

    E-Print Network [OSTI]

    Boyer, Edmond

    . It consists in using Predictive Functional Control (PFC) so as to compute, on-line, the maximum vehicle and braking control [3] and [2]), they appear to be poorly relevant for fast off-road motion context (since]. It consists in the on-line adaptation of tire cornering stiffnesses, representative of grip conditions, based

  5. This study presents an adaptive solution to topographic feature extraction from digital terrain model. First, a slope

    E-Print Network [OSTI]

    Shan, Jie

    not directly support geospatial query and analysis. Finding interesting objects or features in DTM-based geospatial analysis such as dimension calculation and buffering. Finally, comparing with object precision drop in the adaptive method. Introduction Recent advances in geospatial data collection technology

  6. Conductive incubation and the origin of dome-and-keel structure in Archean granite-greenstone terrains

    E-Print Network [OSTI]

    Sandiford, Mike

    Conductive incubation and the origin of dome-and-keel structure in Archean granite August 2003; accepted 24 October 2003; published 27 January 2004. [1] The Archean East Pilbara Granite duration, following the burial of radiogenic granitic crust beneath the accumulated greenstone pile

  7. DETENTE PAR SAIGNEE DE VOffiS PROFONDES: UNE METHODE EFFICACE POUR LA LUTTE CONTRE LES COUPS DE TERRAINS

    E-Print Network [OSTI]

    Boyer, Edmond

    heavage m deep coal mines may be alleviated using extensive floor slottmg before mining operadons Start be produced before the seam is worked. Subsequently die slot is monitored over dme to assess its effecdveness

  8. Interactive Mapping on Virtual Terrain Models Tony Bernardin Eric Cowgill Ryan Gold Bernd Hamann Oliver Kreylos Alfred Schmitt

    E-Print Network [OSTI]

    Hamann, Bernd

    in the creation and interpretation of geologic/neotectonic maps at length scales of 10 m to 1000 km. Our system to measure the orientations of geologic surfaces and record their observations by drawing lines directly and displayed to facilitate understanding of the three-dimensional geometry of geologic surfaces. The main

  9. Funneling Algorithms for Multi-Scale Optimization on Rugged Terrains Angelo Lucia*, Peter A. DiMaggio and Praveen Depa

    E-Print Network [OSTI]

    Lucia, Angelo

    for estimating binary interaction parameters for the Non- Random Two-Liquid (NRTL) equation for activity

  10. Immersed Boundary Methods for High-Resolution Simulation of Atmospheric Boundary-Layer Flow Over Complex Terrain

    E-Print Network [OSTI]

    Lundquist, Katherine Ann

    2010-01-01T23:59:59.000Z

    large-eddy simulations within mesoscale simulations for windEddy Simulation of a Mesoscale Convective Internal Boundary185, 1957. Pielke, R. , Mesoscale Meteorological Modeling,

  11. Large eddy simulation of atmospheric boundary layer flow in urban terrain : implications for transport of pollution and heat

    E-Print Network [OSTI]

    Sun, Long

    2011-01-01T23:59:59.000Z

    When the convection heat transfer model is well validated,models, convection heat transfer model is often over-and a convection heat transfer model with local accuracy is

  12. Large eddy simulation of atmospheric boundary layer flow in urban terrain : implications for transport of pollution and heat

    E-Print Network [OSTI]

    Sun, Long

    2011-01-01T23:59:59.000Z

    losses of a flat-plate collector, Solar Energy 35, 15–19.from outer cover of solar collectors, Renew. Energ. 10 (4)

  13. Sesso Temtica: Aplicaes Geolgicas e Geomorfolgicas de Anlise Digital de Terreno (Geological and Geomorphological Applications of Digital Terrain Analysis)

    E-Print Network [OSTI]

    suas relações espaciais. A Análise Digital de Terreno, ou geomorfometria, fornece a base para dados geofísicos. Esta sessão será uma excelente oportunidade para apresentar e discutir os avanços mais de dados levantados por VANTs - a experiência do DNPM Dra. Cristina Bicho (DNPM) 11:10 12:00 Projeto

  14. Unstable Wave Modes Over Complex Terrain Craig C. Epifanio1, David J. Muraki and Youngsuk Lee2

    E-Print Network [OSTI]

    the Linear Instability Modes Three peaks, Nh/U = 0.5 color: disturbance ­ lines: Long's · Begin with steady Long's solution · Linearize model about Long's basic flow · Add random noise field · Allow disturbance modes to grow from noise #12;Growing the Linear Instability Modes Getting the growth rate and frequency

  15. Isolating Effects of Water Table Dynamics, Terrain, and Soil Moisture Heterogeneity on the Atmospheric Boundary Layer Using Coupled Models

    E-Print Network [OSTI]

    Rihani, Jehan

    2010-01-01T23:59:59.000Z

    boundary conditions of wind, potential temperature, andvariables such as winds, potential temperature, rainfall,variables such as wind speed, potential temperature, and

  16. Electrokinetic transport in microchannels with random roughness

    SciTech Connect (OSTI)

    Wang, Moran [Los Alamos National Laboratory; Kang, Qinjun [Los Alamos National Laboratory

    2008-01-01T23:59:59.000Z

    We present a numerical framework to model the electrokinetic transport in microchannels with random roughness. The three-dimensional microstructure of the rough channel is generated by a random generation-growth method with three statistical parameters to control the number density, the total volume fraction, and the anisotropy characteristics of roughness elements. The governing equations for the electrokinetic transport are solved by a high-efficiency lattice Poisson?Boltzmann method in complex geometries. The effects from the geometric characteristics of roughness on the electrokinetic transport in microchannels are therefore modeled and analyzed. For a given total roughness volume fraction, a higher number density leads to a lower fluctuation because of the random factors. The electroosmotic flow rate increases with the roughness number density nearly logarithmically for a given volume fraction of roughness but decreases with the volume fraction for a given roughness number density. When both the volume fraction and the number density of roughness are given, the electroosmotic flow rate is enhanced by the increase of the characteristic length along the external electric field direction but is reduced by that in the direction across the channel. For a given microstructure of the rough microchannel, the electroosmotic flow rate decreases with the Debye length. It is found that the shape resistance of roughness is responsible for the flow rate reduction in the rough channel compared to the smooth channel even for very thin double layers, and hence plays an important role in microchannel electroosmotic flows.

  17. Design of a Helicopter Deployable Ground Robotic System for Hazardous Environments

    E-Print Network [OSTI]

    Kochersberger, Kevin

    /terrain interaction model to compute the cost of path traversal. In the CONOPS, the terrain model is generated real

  18. Water Dynamics at Rough Interfaces

    E-Print Network [OSTI]

    Markus Rosenstihl; Kerstin Kämpf; Felix Klameth; Matthias Sattig; Michael Vogel

    2014-07-21T23:59:59.000Z

    We use molecular dynamics computer simulations and nuclear magnetic resonance experiments to investigate the dynamics of water at interfaces of molecular roughness and low mobility. We find that, when approaching such interfaces, the structural relaxation of water, i.e., the $\\alpha$ process, slows down even when specific attractive interactions are absent. This prominent effect is accompanied by a smooth transition from Vogel to Arrhenius temperature dependence and by a growing importance of jump events. Consistently, at protein surfaces, deviations from Arrhenius behavior are weak when free water does not exist. Furthermore, in nanoporous silica, a dynamic crossover of liquid water occurs when a fraction of solid water forms near 225 K and, hence, the liquid dynamics changes from bulk-like to interface-dominated. At sufficiently low temperatures, water exhibits a quasi-universal $\\beta$ process, which is characterized by an activation energy of $E_a\\!=\\!0.5$ eV and involves anisotropic reorientation about large angles. As a consequence of its large amplitude, the faster $\\beta$ process destroys essentially all orientational correlation, rendering observation of a possible slower $\\alpha$ process difficult in standard experiments. Nevertheless, we find indications for the existence of structural relaxation down to a glass transition of interfacial water near 185 K. Hydrated proteins show a highly restricted backbone motion with an amplitude, which decreases upon cooling and vanishes at comparable temperatures, providing evidence for a high relevance of water rearrangements in the hydration shell for secondary protein relaxations.

  19. Enhanced thermoelectric performance of rough silicon nanowires

    E-Print Network [OSTI]

    Yang, Peidong

    LETTERS Enhanced thermoelectric performance of rough silicon nanowires Allon I. Hochbaum1 *, Renkun, such that roughly 15 terawatts of heat is lost to the environment. Thermoelectric modules could potentially convert part of this low-grade waste heat to electricity. Their efficiency depends on the thermoelectric figure

  20. Simplified models for mask roughness induced LER

    SciTech Connect (OSTI)

    McClinton, Brittany; Naulleau, Patrick

    2011-02-21T23:59:59.000Z

    The ITRS requires < 1.2nm line-edge roughness (LER) for the 22nm half-pitch node. Currently, we can consistently achieve only about 3nm LER. Further progress requires understanding the principle causes of LER. Much work has already been done on how both the resist and LER on the mask effect the final printed LER. What is poorly understood, however, is the extent to which system-level effects such as mask surface roughness, illumination conditions, and defocus couple to speckle at the image plane, and factor into LER limits. Presently, mask-roughness induced LER is studied via full 2D aerial image modeling and subsequent analysis of the resulting image. This method is time consuming and cumbersome. It is, therefore, the goal of this research to develop a useful 'rule-of-thumb' analytic model for mask roughness induced LER to expedite learning and understanding.

  1. Computer Simulation of Uranyl Uptake by the Rough Lipopolysaccharide...

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

    Computer Simulation of Uranyl Uptake by the Rough Lipopolysaccharide Membrane of Pseudomonas aeruginosa. Computer Simulation of Uranyl Uptake by the Rough Lipopolysaccharide...

  2. Viscoelastic contact mechanics between randomly rough surfaces

    E-Print Network [OSTI]

    Michele Scaraggi; Bo N. J. Persson

    2014-06-27T23:59:59.000Z

    We present exact numerical results for the friction force and the contact area for a viscoelastic solid (rubber) in sliding contact with hard, randomly rough substrates. The rough surfaces are self-affine fractal with roughness over several decades in length scales. We calculate the contribution to the friction from the pulsating deformations induced by the substrate asperities. We also calculate how the area of real contact, $A(v,p) $, depends on the sliding speed $v$ and on the nominal contact pressure $p$, and we show how the contact area for any sliding speed can be obtained from a universal master curve $A(p)$. The numerical results are found to be in good agreement with the predictions of an analytical contact mechanics theory.

  3. ROUGHNESS LENGTHS FOR THE SAVANNAH RIVER SITE

    SciTech Connect (OSTI)

    Hunter, C.

    2012-03-28T23:59:59.000Z

    Surface roughness values for the areas surrounding the H, D and N-Area meteorological towers were computed from archived 2010 meteorological data. These 15-minute-averaged data were measured with cup anemometers and bidirectional wind vanes (bivanes) 61 m above the surface. The results of the roughness calculation using the standard deviation of elevation angle {sigma}{sub E}, and applying the simple formula based on tree canopy height, gave consistent estimates for roughness around the H-Area tower in the range of 1.76 to 1.86 m (95% confidence interval) with a mean value of 1.81 m. Application of the {sigma}{sub E} method for the 61-m level at D and N-Areas gave mean values of 1.71 and 1.81 with confidence ranges of 1.62-1.81 and 1.73-1.88 meters, respectively. Roughness results are azimuth dependent, and thus are presented as averages over compass sectors spanning 22.5 degrees. Calculated values were compared to other methods of determining roughness, including the standard deviation of the azimuth direction, {sigma}{sub A}, and standard deviation of the wind speed, {sigma}{sub U}. Additional data was obtained from a sonic anemometer at 61-m on the H-Area tower during a period of a few weeks in 2010. Results from the sonic anemometer support our use of {sigma}{sub E} to calculate roughness. Based on the H-Area tower results, a surface roughness of 1.8 m using is recommended for use in dispersion modeling applications that consider the impacts of a contaminant release to individuals along the Site boundary. The canopy surrounding the H-Area tower is relatively uniform (i.e., little variance in roughness by upwind direction), and data supplied by the U.S. Forest Service at Savannah River show that the canopy height and composition surrounding the H-Area tower is reasonably representative of forested areas throughout the SRS reservation. For dispersion modeling analyses requiring assessments of a co-located worker within the respective operations area, recommended area-specific values range from 0.3 m for E Area to 0.7 m for A Area at the Savannah River National Laboratory. These area-specific values, summarized in Table 4-1, were determined using the Environmental Protection Agency's AERSURFACE computer algorithm.

  4. Influence of surface roughness on superhydrophobicity

    E-Print Network [OSTI]

    C. Yang; U. Tartaglino; B. N. J. Persson

    2006-09-30T23:59:59.000Z

    Superhydrophobic surfaces, with liquid contact angle theta greater than 150 degree, have important practical applications ranging from self-cleaning window glasses, paints, and fabrics to low-friction surfaces. Many biological surfaces, such as the lotus leaf, have hierarchically structured surface roughness which is optimized for superhydrophobicity through natural selection. Here we present a molecular dynamics study of liquid droplets in contact with self-affine fractal surfaces. Our results indicate that the contact angle for nanodroplets depends strongly on the root-mean-square surface roughness amplitude but is nearly independent of the fractal dimension D_f of the surface.

  5. A Rough Logic Formalism for Fuzzy Controllers

    E-Print Network [OSTI]

    Lin, Tsau Young

    logic. 1. Introduction In complex systems, such as power systems, control sub­systems are the most of transformations of mathematical models. It starts with a symbolic model that describes the control system in termsA Rough Logic Formalism for Fuzzy Controllers: A Hard and Soft Computing View T.Y. Lin Department

  6. A fast direct numerical simulation method for characterising hydraulic roughness

    E-Print Network [OSTI]

    Chung, Daniel; MacDonald, Michael; Hutchins, Nicholas; Ooi, Andrew

    2015-01-01T23:59:59.000Z

    We describe a fast direct numerical simulation (DNS) method that promises to directly characterise the hydraulic roughness of any given rough surface, from the hydraulically smooth to the fully rough regime. The method circumvents the unfavourable computational cost associated with simulating high-Reynolds-number flows by employing minimal-span channels (Jimenez & Moin 1991). Proof-of-concept simulations demonstrate that flows in minimal-span channels are sufficient for capturing the downward velocity shift, that is, the Hama roughness function, predicted by flows in full-span channels. We consider two sets of simulations, first with modelled roughness imposed by body forces, and second with explicit roughness described by roughness-conforming grids. Owing to the minimal cost, we are able to conduct DNSs with increasing roughness Reynolds numbers while maintaining a fixed blockage ratio, as is typical in full-scale applications. The present method promises a practical, fast and accurate tool for character...

  7. Equivalent roughness height for plane bed under oscillatory flow

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    , the bed roughness height of a flat and fixed bed is given in terms of the Nikuradse roughness height (ks may be several orders of magnitude larger than for a fixed bed. This is probably causedEquivalent roughness height for plane bed under oscillatory flow Beno^it Camenen , Magnus Larson

  8. Les expriences de laboratoire permettent-elles de prvoir le transport de HAP et de mtaux l'chelle du lysimtre de terrain ?

    E-Print Network [OSTI]

    Boyer, Edmond

    a généré de vastes superficies de friches polluées par des hydrocarbures lourds (de type Hydrocarbures particulier par des Hydrocarbures Aromatiques Polycycliques (HAP), des métaux, de l'arsenic et du cyanure

  9. Analysis of wind shear models and trends in different terrains M.L. Ray *, A.L. Rogers, and J.G. McGowan

    E-Print Network [OSTI]

    Massachusetts at Amherst, University of

    of characterizing the wind shear at a given site for a utility scale wind turbine cannot be overemphasized. It is important to understand because it directly impacts the power available at different wind turbine hub heights and strongly influences the cyclic loading on the turbine blades. For decades, academic

  10. Soil moisture in complex terrain: quantifying effects on atmospheric boundary layer flow and providing improved surface boundary conditions for mesoscale models

    E-Print Network [OSTI]

    Daniels, Megan Hanako

    2010-01-01T23:59:59.000Z

    74 ii Soil Moisture Sensors: Decagon ECH2O Capacitance133 A.10 Soil types corresponding to each75 Soil Moisture and Temperature Probe

  11. A climatic basis for microrefugia: the influence of terrain S O L O M O N Z . D O B R O W S K I *

    E-Print Network [OSTI]

    Dobrowski, Solomon

    to understanding present day biotic response to anthropogenic warming (Noss, 2001; Pearson, 2006; Provan & Bennet; Provan & Bennet, 2008). The purported utilization of microrefugia has far- reaching implications

  12. Soil moisture in complex terrain: quantifying effects on atmospheric boundary layer flow and providing improved surface boundary conditions for mesoscale models

    E-Print Network [OSTI]

    Daniels, Megan Hanako

    2010-01-01T23:59:59.000Z

    red indicates “water towers” generated by kinematic wavethe kinematic wave equation will begin to collect water onred indicates “water towers” generated by kinematic wave

  13. IEEE TRANS. AEROSP. ELECTRON. SYST., VOL. 43, NO. 4, PP. 1617-1624, OCT. 2007 1617 Terrain-Based Simulation of IEEE 802.11a and b

    E-Print Network [OSTI]

    De Leon, Phillip

    path loss, coverage, and medium access control (MAC) throughput in a corporate office environment using for proximity wireless networks on the Martian surface. The radio frequency (RF) environment on the Martian), is found to be much more adversely affected in the multipath environment. The DEM-based simulation

  14. Soil moisture in complex terrain: quantifying effects on atmospheric boundary layer flow and providing improved surface boundary conditions for mesoscale models

    E-Print Network [OSTI]

    Daniels, Megan Hanako

    2010-01-01T23:59:59.000Z

    groundwater, land-surface, and mesoscale atmospheric model-and modification of mesoscale circulations. , Mon. Wea.J. Davis, The effects of mesoscale surface heterogeneity on

  15. Soil moisture in complex terrain: quantifying effects on atmospheric boundary layer flow and providing improved surface boundary conditions for mesoscale models

    E-Print Network [OSTI]

    Daniels, Megan Hanako

    2010-01-01T23:59:59.000Z

    direction, (b) wind speed, (c) potential temperature, and (Airport of potential temperature, wind speed, winderrors (bias) for potential temperature, wind speed, wind

  16. Extreme ultraviolet mask substrate surface roughness effects on lithography patterning

    SciTech Connect (OSTI)

    George, Simi; Naulleau, Patrick; Salmassi, Farhad; Mochi, Iacopo; Gullikson, Eric; Goldberg, Kenneth; Anderson, Erik

    2010-06-21T23:59:59.000Z

    In extreme ultraviolet lithography exposure systems, mask substrate roughness induced scatter contributes to LER at the image plane. In this paper, the impact of mask substrate roughness on image plane speckle is explicitly evaluated. A programmed roughness mask was used to study the correlation between mask roughness metrics and wafer plane aerial image inspection. We find that the roughness measurements by top surface topography profile do not provide complete information on the scatter related speckle that leads to LER at the image plane. We suggest at wavelength characterization by imaging and/or scatter measurements into different frequencies as an alternative for a more comprehensive metrology of the mask substrate/multilayer roughness effects.

  17. Submit a Public Comment on The Atmosphere to Electrons (A2e)...

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

    Forecasting Improvement Project in Complex Terrain Funding Opportunity Announcement for Wind Forecasting Improvement Project in Complex Terrain Air Force Announces Funding for...

  18. Equivalent Roughness Height for Plane Bed under Steady Flow

    E-Print Network [OSTI]

    US Army Corps of Engineers

    current conditions. In general, owing to dimensional reasons, the bed roughness height of a flat and fixed orders of magnitude larger than for a fixed bed. This is probably caused by the increased energyEquivalent Roughness Height for Plane Bed under Steady Flow Benoît Camenen, Ph.D.1 ; Atilla Bayram

  19. FRACTAL DESCRIPTION OF ROUGH SURFACES FOR HAPTIC DISPLAY

    E-Print Network [OSTI]

    Stanford University

    FRACTAL DESCRIPTION OF ROUGH SURFACES FOR HAPTIC DISPLAY A DISSERTATION SUBMITTED TO THE DEPARTMENT system using fractals. A background on traditional methods for describing surface roughness is given. Fractals are used to characterize one- dimensional surface profiles using two parameters, the amplitude

  20. Rough-Fuzzy MLP: Modular Evolution, Rule Generation, and Evaluation

    E-Print Network [OSTI]

    Mitra, Sushmita

    efficient systems in soft computing paradigm. Recently, the theory of rough sets [2], [3] has emerged, Sushmita Mitra, Senior Member, IEEE, and Pabitra Mitra, Student Member, IEEE Abstract--A methodology Terms--Soft computing, knowledge-based fuzzy networks, rough sets, genetic algorithms, pattern

  1. ORIGINAL PAPER Transient Heat Conduction Between Rough Sliding Surfaces

    E-Print Network [OSTI]

    Barber, James R.

    ORIGINAL PAPER Transient Heat Conduction Between Rough Sliding Surfaces Yuwei Liu · J. R. Barber+Business Media New York 2014 Abstract When two rough bodies slide against each other, asperities on the opposing contact pressure as functions of the separation between reference planes in the two surfaces. We find

  2. Distributed Roughness Receptivity in a Flat Plate Boundary Layer

    E-Print Network [OSTI]

    Kuester, Matthew Scott

    2014-04-18T23:59:59.000Z

    for the three different unit Reynolds num- ber test conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 3.4 Spanwise uniformity of boundary layer integral quantities at x = 870 mm for low unit Reynolds number test condition... with the distributed roughness configuration . . . . . . . . . . . . . . . . . . . . . . . . . . 24 3.5 Differential pressure across the flat plate leading edge. . . . . . . . . . 25 3.6 Roughness patch (k = 1 mm), before windowing . . . . . . . . . . . . 27 3...

  3. Fuzzy Rough Positive Region based Nearest Neighbour Classification

    E-Print Network [OSTI]

    Gent, Universiteit

    of the main subjects in machine learning and pattern recognition, with applications in fields like spam theory to improve the FNN classifier. Fuzzy rough set theory was designed to model imperfect knowledgeFuzzy Rough Positive Region based Nearest Neighbour Classification Nele Verbiest, Chris Cornelis

  4. Case Generation Using Rough Sets with Fuzzy Representation

    E-Print Network [OSTI]

    Mitra, Pabitra

    , granular computing, rough-fuzzy hybridization, soft computing, pattern recognition, data mining. æ 1 for case generation. Fuzzy set theory is used for linguistic representation of patterns, thereby producing a fuzzy granulation of the feature space. Rough set theory is used to obtain dependency rules which model

  5. Measurement of normal contact stiffness of fractal rough surfaces

    E-Print Network [OSTI]

    Chongpu Zhai; Sébastien Bevand; Yixiang Gan; Dorian Hanaor; Gwénaëlle Proust; Bruno Guelorget; Delphine Retraint

    2014-09-03T23:59:59.000Z

    We investigate the effects of roughness and fractality on the normal contact stiffness of rough surfaces. Samples of isotropically roughened aluminium surfaces are considered. The roughness and fractal dimension were altered through blasting using different sized particles. Subsequently, surface mechanical attrition treatment (SMAT) was applied to the surfaces in order to modify the surface at the microscale. The surface topology was characterised by interferometry based profilometry. The normal contact stiffness was measured through nanoindentation with a flat tip utilising the partial unloading method. We focus on establishing the relationships between surface stiffness and roughness, combined with the effects of fractal dimension. The experimental results, for a wide range of surfaces, showed that the measured contact stiffness depended very closely on surfaces' root mean squared (RMS) slope and their fractal dimension, with correlation coefficients of around 90\\%, whilst a relatively weak correlation coefficient of 57\\% was found between the contact stiffness and RMS roughness.

  6. Surface forces: Surface roughness in theory and experiment

    SciTech Connect (OSTI)

    Parsons, Drew F., E-mail: Drew.Parsons@anu.edu.au; Walsh, Rick B.; Craig, Vincent S. J. [Department of Applied Mathematics, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200 (Australia)] [Department of Applied Mathematics, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200 (Australia)

    2014-04-28T23:59:59.000Z

    A method of incorporating surface roughness into theoretical calculations of surface forces is presented. The model contains two chief elements. First, surface roughness is represented as a probability distribution of surface heights around an average surface height. A roughness-averaged force is determined by taking an average of the classic flat-surface force, weighing all possible separation distances against the probability distributions of surface heights. Second the model adds a repulsive contact force due to the elastic contact of asperities. We derive a simple analytic expression for the contact force. The general impact of roughness is to amplify the long range behaviour of noncontact (DLVO) forces. The impact of the elastic contact force is to provide a repulsive wall which is felt at a separation between surfaces that scales with the root-mean-square (RMS) roughness of the surfaces. The model therefore provides a means of distinguishing between “true zero,” where the separation between the average centres of each surface is zero, and “apparent zero,” defined by the onset of the repulsive contact wall. A normal distribution may be assumed for the surface probability distribution, characterised by the RMS roughness measured by atomic force microscopy (AFM). Alternatively the probability distribution may be defined by the histogram of heights measured by AFM. Both methods of treating surface roughness are compared against the classic smooth surface calculation and experimental AFM measurement.

  7. Effect of Surface Roughness on Wind Turbine Performance

    E-Print Network [OSTI]

    Ehrmann, Robert Schaefer

    2014-06-25T23:59:59.000Z

    40% for 140 µm roughness, corresponding to a 2.3% loss in annual energy production. Simulated performance loss compares well to measured performance loss on an in-service wind turbine....

  8. Influence of surface roughness and waviness upon thermal contact resistance

    E-Print Network [OSTI]

    Yovanovich, M. Michael

    1967-01-01T23:59:59.000Z

    This work deals with the phenomenon of thermal resistance between contacting solids. Attention is directed towards contiguous solids possessing both surface roughness and waviness. When two such surfaces are brought together ...

  9. Hypersonic Measurements of Roughness-Induced Transient Growth

    E-Print Network [OSTI]

    Sharp, Nicole Susanne

    2014-04-17T23:59:59.000Z

    but about boundary-layer stability in general. Dr. Rob Downs and Doug Kutz provided valuable assistance and code when I was designing my quasi-random periodic distributed roughness. Jason Monschke’s help has been invaluable, not only for the self- similar... simulations using the periodically-spaced discrete roughness geometry. Jason Monschke has performed the optimal disturbance calculations described in the dissertation using code kindly shared by Dr. Simone Zuccher. Jason is also working on secondary...

  10. Visualization of Membrane Fusion, One Particle at a Time Jason Otterstrom,

    E-Print Network [OSTI]

    to a number of model systems have resulted in a new experimental paradigm and open up considerable membranes from two initially separate bilayers is an energetically favorable one, there are many energetic. Significant energetic barriers separating these intermediates make the energetic landscape a rough terrain

  11. Wireless Networks in Rural Areas: Challenges and Solutions

    E-Print Network [OSTI]

    Dyer, Bill

    Wireless Networks in Rural Areas: Challenges and Solutions Shen Wan April 25, 2009 Abstract In this thesis proposal, we discuss the current limitations and chal- lenges in wireless networks, especially in rural, remote or areas with rough terrains. Although traditional wireless networking technologies have

  12. Towards Realization of Adaptive Running of a Quadruped Robot Using Delayed Feedback Control

    E-Print Network [OSTI]

    Kimura, Hiroshi

    the following results: 1) When a robot runs on flat terrain without disturbance causing energy loss, the selfTowards Realization of Adaptive Running of a Quadruped Robot Using Delayed Feedback Control Zu and efficient running on flat and rough ter- rain. The Rush robot is a compact, kneed, four legged machine

  13. From R. Zoebel and D. Moeller, eds., 1998, Proceedings of the 12th European Simulation Multiconference, University of Manchester, p.437-442 A SIMULATION TESTBED FOR BIOLOGICALLY INSPIRED

    E-Print Network [OSTI]

    Delcomyn, Fred

    transmission properties such as delay, sampling rate, and noise. INTRODUCTION A key issue in the field robots can handle obstacles, but cannot easily move quickly over rough terrain or right themselves a way around these impediments. In the remainder of this paper, we describe a dynamics simulator

  14. Mars Robotic Outpost Papers "We can all go to Mars-the Mars Outpost Proposal" Louis Friedman and Bruce Murray, the

    E-Print Network [OSTI]

    Dennis, Robert G.

    and handling -ISRU plant deployment -internal habitat servicing "Automation and Robotics for Human Mars sampling from aerial vehicles -in situ propellants and vehicles that use them -subsurface and submersible vehicle concepts -high speed, rough terrain, sensing and processing for autonomous navigation and data

  15. Centauri Dreams Imagining and Planning Interstellar Exploration

    E-Print Network [OSTI]

    Arizona, University of

    and steep terrain to explore them. Airships would be particularly useful in environments like Titan, where

  16. Compiled Multi-Lab Geochemistry Synoptic Survey (LANL, ORNL, LBNL), Barrow, Alaska; 2012

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

    Brent Newman; Heather Throckmorton

    To assess the effects of microtopography and depth on ground water geochemistry in arctic polygonal terrain.

  17. Atmospheric Science: An introductory survey 1. Introduction to the atmosphere

    E-Print Network [OSTI]

    Folkins, Ian

    Sound Convergence Zone #12;Terrain effects #12;Von Karman vortex streets #12;Atmosphere in Earth system

  18. TextureCam: A Smart Camera for Microscale, Mesoscale, and Deep Space Applications. David R. Thomp-, William Abbey2

    E-Print Network [OSTI]

    Wagstaff, Kiri L.

    rovers to interpret the sedimentology of the terrain en route, and could assist analyses by scientists

  19. The thermal Casimir effect for rough metallic plates

    E-Print Network [OSTI]

    G. Bimonte

    2007-11-04T23:59:59.000Z

    We propose a new theory of thermal Casimir effect, holding for the experimentally important case of metallic surfaces with a roughness having a spatial scale smaller than the skin depth. The theory is based on a simple phenomenological model for a rough conductor, that explicitly takes account of the fact that ohmic conduction in the immediate vicinity of the surface of a conductor is much impeded by surface roughness, if the amplitude of roughness is smaller than the skin depth. As a result of the new model, we find that surface roughness strongly influences the magnitude of the thermal correction to the Casimir force, independently of the plates separation. Our model, while consistent with recent accurate measurements of the Casimir force in the submicron range, leads to a new prediction for the not yet observed thermal correction to the Casimir force at large plates separation. Besides the thermal Casimir problem, our model is relevant for the correct theoretical interpretation of current experiments probing other proximity effects between conductors, like radiative heat transfer and quantum friction.

  20. Structural contribution to the roughness of supersmooth crystal surface

    SciTech Connect (OSTI)

    Butashin, A. V.; Muslimov, A. E., E-mail: amuslimov@mail.ru; Kanevsky, V. M.; Deryabin, A. N.; Pavlov, V. A.; Asadchikov, V. E. [Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation)

    2013-05-15T23:59:59.000Z

    Technological advances in processing crystals (Si, sapphire {alpha}-Al{sub 2}O{sub 3}, SiC, GaN, LiNbO{sub 3}, SrTiO{sub 3}, etc.) of substrate materials and X-ray optics elements make it possible to obtain supersmooth surfaces with a periodicity characteristic of the crystal structure. These periodic structures are formed by atomically smooth terraces and steps of nano- and subnanometer sizes, respectively. A model surface with such nanostructures is proposed, and the relations between its roughness parameters and the height of atomic steps are determined. The roughness parameters calculated from these relations almost coincide with the experimental atomic force microscopy (AFM) data obtained from 1 Multiplication-Sign 1 and 10 Multiplication-Sign 10 {mu}m areas on the surface of sapphire plates with steps. The minimum roughness parameters for vicinal crystal surfaces, which are due to the structural contribution, are calculated based on the approach proposed. A comparative analysis of the relief and roughness parameters of sapphire plate surfaces with different degrees of polishing is performed. A size effect is established: the relief height distribution changes from stochastic to regular with a decrease in the surface roughness.

  1. Inhomogeneous Cooling of the Rough Granular Gas in Two Dimensions

    E-Print Network [OSTI]

    Sudhir N. Pathak; Dibyendu Das; R. Rajesh

    2014-07-03T23:59:59.000Z

    We study the inhomogeneous clustered regime of a freely cooling granular gas of rough particles in two dimensions using large-scale event driven simulations and scaling arguments. During collisions, rough particles dissipate energy in both the normal and tangential directions of collision. In the inhomogeneous regime, translational kinetic energy and the rotational energy decay with time $t$ as power-laws $t^{-\\theta_T}$ and $t^{-\\theta_R}$. We numerically determine $\\theta_T \\approx 1$ and $\\theta_R \\approx 1.6$, independent of the coefficients of restitution. The inhomogeneous regime of the granular gas has been argued to be describable by the ballistic aggregation problem, where particles coalesce on contact. Using scaling arguments, we predict $\\theta_T=1$ and $\\theta_R=1$ for ballistic aggregation, $\\theta_R$ being different from that obtained for the rough granular gas. Simulations of ballistic aggregation with rotational degrees of freedom are consistent with these exponents.

  2. Journal of Differential Equations Ramification of rough paths

    E-Print Network [OSTI]

    2013-03-05T23:59:59.000Z

    Dec 1, 2009 ... B-series. The stack of iterated integrals of a path is embedded in a larger al- gebraic structure ... iterated integrals [18,19] which is at the base of Lyons theory of rough paths [20]. Lyons theory ...... ?|b| ? g(|b|)(rs), see e.g. [5, p.

  3. A CONSTRUCTION OF THE ROUGH PATH ABOVE FRACTIONAL ...

    E-Print Network [OSTI]

    2013-03-05T23:59:59.000Z

    fractional Brownian motion B with any Hurst parameter H ? (0,1), by means ... Rough paths analysis is a theory introduced by Terry Lyons in the pioneering ... functions with finite p-variation with p > 1, or by Hölder continuous functions of order ...

  4. Technical Briefs A Compact Model for Spherical Rough

    E-Print Network [OSTI]

    Bahrami, Majid

    of rough spheres includes two problems, i the bulk compression and ii deformation of asperities. Different index as a criterion for plastic flow of mi- crocontacts. They reported that the load has little effect on the deformation regime. Based on the plasticity index, they concluded that except for especially smooth surfaces

  5. Studies of the 3D surface roughness height

    SciTech Connect (OSTI)

    Avisane, Anita; Rudzitis, Janis; Kumermanis, Maris [Institute of Mechanical Engineering, Riga Technical University, Ezermalas str. 6k, Riga (Latvia)

    2013-12-16T23:59:59.000Z

    Nowadays nano-coatings occupy more and more significant place in technology. Innovative, functional coatings acquire new aspects from the point of view of modern technologies, considering the aggregate of physical properties that can be achieved manipulating in the production process with the properties of coatings’ surfaces on micro- and nano-level. Nano-coatings are applied on machine parts, friction surfaces, contacting parts, corrosion surfaces, transparent conducting films (TCF), etc. The equipment available at present for the production of transparent conducting oxide (TCO) coatings with highest quality is based on expensive indium tin oxide (ITO) material; therefore cheaper alternatives are being searched for. One such offered alternative is zink oxide (ZnO) nano-coatings. Evaluating the TCF physical and mechanical properties and in view of the new ISO standard (EN ISO 25178) on the introduction of surface texture (3D surface roughness) in the engineering calculations, it is necessary to examine the height of 3D surface roughness, which is one of the most significant roughness parameters. The given paper studies the average values of 3D surface roughness height and the most often applied distribution laws are as follows: the normal distribution and Rayleigh distribution. The 3D surface is simulated by a normal random field.

  6. Large deviations for rough paths of fractional Brownian motion

    E-Print Network [OSTI]

    Millet, Annie

    limit theorem. Stochastic modeling deals basically with rough path controls. Indeed, the ground-breaking It^o's theory on stochastic differential equations is based on Brownian motion, which has almost surely nowhere differentiable sam- ple paths but only -H¨older continuous ones, with ]0, 1 2 [. Note

  7. Hypersonic Measurements of Roughness-Induced Transient Growth 

    E-Print Network [OSTI]

    Sharp, Nicole Susanne

    2014-04-17T23:59:59.000Z

    streaks may play a key role in roughness-induced transition but has not previously been deliberately observed in hypersonic flow. To make such measurements, the present work studies the boundary layer of a 5° half-angle smooth cone paired with a slightly...

  8. Discussion of ``Atmospheric Momentum Roughness Applied to Stage-Discharge

    E-Print Network [OSTI]

    the Darcy-Weisbach equation and conventional log law and derive an alternative log law equation to calculate discussion. Concerning the resistance equations, if their Eq. 2 holds, the Darcy-Weisbach friction factor f equation and the selection of appropriate roughness param- eters. They discuss the merits of different

  9. Calculating Very Rough Market Share Using the Canadian Business Database

    E-Print Network [OSTI]

    Thompson, Michael

    Calculating Very Rough Market Share Using the Canadian Business Database If you cannot find market market share using the company information provided in the Canadian Business Database (CBD), an online - it should be considered a last resort for this information. STEP 1: ACCESS THE CANADIAN BUSINESS DATABASE 1a

  10. The effect of roughness on aerosol deposition in tubes

    E-Print Network [OSTI]

    Chavez, Mario Cesar

    1997-01-01T23:59:59.000Z

    Experimental measurements of simulated roughness within tubes and the subsequent aerosol penetration performance through these tubes were conducted for a aerosol particle size range of 5 nm to 20 nm and a flow rate range of 28 L/min to 169.9 L...

  11. Dropwise condensation on superhydrophobic surfaces with two-tier roughness

    E-Print Network [OSTI]

    Chen, Chuan-Hua

    Dropwise condensation on superhydrophobic surfaces with two-tier roughness Chuan-Hua Chen,a Qingjun condensation. Superhydrophobicity appears ideal to promote continued dropwise condensation which requires rapid. This letter reports continuous dropwise condensation on a superhydrophobic surface with short carbon nanotubes

  12. Heat transfer between elastic solids with randomly rough surfaces

    E-Print Network [OSTI]

    B. N. J. Persson; B. Lorenz; A. I. Volokitin

    2009-08-27T23:59:59.000Z

    We study the heat transfer between elastic solids with randomly rough surfaces. We include both the heat transfer from the area of real contact, and the heat transfer between the surfaces in the noncontact regions. We apply a recently developed contact mechanics theory, which accounts for the hierarchical nature of the contact between solids with roughness on many different length scales. For elastic contact, at the highest (atomic) resolution the area of real contact typically consists of atomic (nanometer) sized regions, and we discuss the implications of this for the heat transfer. For solids with very smooth surfaces, as is typical in many modern engineering applications, the interfacial separation in the non-contact regions will be very small, and for this case we show the importance of the radiative heat transfer associated with the evanescent electromagnetic waves which exist outside of all bodies.

  13. Separate effects of surface roughness, wettability, and porosity on the boiling critical heat flux

    E-Print Network [OSTI]

    O'Hanley, Harry

    The separate effects of surface wettability, porosity, and roughness on the critical heat flux (CHF) of water were examined using engineered surfaces. Values explored were 0, 5, 10, and 15??m for Rz (roughness), <5°, ?75°, ...

  14. ROUGH THIN PAVEMENT THICKNESS ESTIMATION BY GPR N. Pinel, L. Liu, C. Bourlier, Y. Wang

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    ROUGH THIN PAVEMENT THICKNESS ESTIMATION BY GPR N. Pinel, L. Liu, C. Bourlier, Y. Wang IREENA pavements consider flat interfaces for simpli- fication. In this paper, the roughness of the surfaces is taken into account. First, the amplitudes of the first two echoes from the rough thin pavement

  15. Effects of hydraulic roughness on surface textures of gravel-bed rivers

    E-Print Network [OSTI]

    Effects of hydraulic roughness on surface textures of gravel-bed rivers John M. Buffington1 that bed-surface grain size is responsive to hydraulic roughness caused by bank irregularities, bars condition of low hydraulic roughness. For a given 0bf , channels with progressively greater hydraulic

  16. Independent External Peer Review Report Rough River Dam 18 August 2011 ii

    E-Print Network [OSTI]

    US Army Corps of Engineers

    #12;Independent External Peer Review Report ­ Rough River Dam 18 August 2011 ii This page intentionally blank. #12;Independent External Peer Review Report ­ Rough River Dam 18 August 2011 iii Table Panel Members B-1 Appendix C ­ Charge for IEPR Panel C-1 List of Figures Figure 1. Rough River Dam 4

  17. Graphene thickness dependent adhesion force and its correlation to surface roughness

    SciTech Connect (OSTI)

    Pourzand, Hoorad [Electrical and Computer Engineering, University of Utah, Salt Lake City, Utah 84112 (United States); Tabib-Azar, Massood, E-mail: azar.m@utah.edu [Electrical and Computer Engineering, University of Utah, Salt Lake City, Utah 84112 (United States); Biomedical Engineering, University of Utah, Salt Lake City, Utah 84112 (United States)

    2014-04-28T23:59:59.000Z

    In this paper, adhesion force of graphene layers on 300?nm silicon oxide is studied. A simple model for measuring adhesion force for a flat surface with sub-nanometer roughness was developed and is shown that small surface roughness decreases adhesion force while large roughness results in an effectively larger adhesion forces. We also show that surface roughness over scales comparable to the tip radius increase by nearly a factor of two, the effective adhesion force measured by the atomic force microscopy. Thus, we demonstrate that surface roughness is an important parameter that should be taken into account in analyzing the adhesion force measurement results.

  18. Semiclassical Theory of Integrable and Rough Andreev Billiards

    E-Print Network [OSTI]

    W. Ihra; M. Leadbeater; J. L. Vega; K. Richter

    1999-09-08T23:59:59.000Z

    We study the effect on the density of states in mesoscopic ballistic billiards to which a superconducting lead is attached. The expression for the density of states is derived in the semiclassical S-matrix formalism shedding insight into the origin of the differences between the semiclassical theory and the corresponding result derived from random matrix models. Applications to a square billiard geometry and billiards with boundary roughness are discussed. The saturation of the quasiparticle excitation spectrum is related to the classical dynamics of the billiard. The influence of weak magnetic fields on the proximity effect in rough Andreev billiards is discussed and an analytical formula is derived. The semiclassical theory provides an interpretation for the suppression of the proximity effect in the presence of magnetic fields as a coherence effect of time reversed trajectories, similar to the weak localisation correction of the magneto-resistance in chaotic mesoscopic systems. The semiclassical theory is shown to be in good agreement with quantum mechanical calculations.

  19. Local contact stress measurements at a rough interface

    E-Print Network [OSTI]

    J. Scheibert; A. Prevost; J. Frelat; P. Rey; G. Debrégeas

    2007-11-07T23:59:59.000Z

    An original MEMS-based force sensing device is designed which allows to measure spatially resolved normal and tangential stress fields at the base of an elastomeric film. This device is used for the study of the contact stress between a rough film and a smooth glass sphere under normal load. The measured profiles are compared to Finite Elements Method calculations for a smooth contact with boundary conditions obeying Amontons-Coulomb's friction law. The accuracy of the measurements allows to discriminate between dry and lubricated contact conditions and to evidence load-dependent deviations from Amontons-Coulomb's profiles. These deviations are qualitatively interpreted by taking into account the finite compliance of the micro-contact population.

  20. Thermodynamics of sustaining gases in the roughness of submerged superhydrophobic surfaces

    E-Print Network [OSTI]

    Neelesh A. Patankar

    2015-05-22T23:59:59.000Z

    Rough surfaces submerged in a liquid can remain almost dry if the liquid does not fully wet the roughness and gases are sustained in roughness grooves. Such partially dry surfaces can help reduce drag or enhance boiling. Gases sustained in roughness grooves would be composed of air and the vapor phase of the liquid itself. The thermodynamics of sustaining vapor was considered in a prior work [Patankar, Soft Matter, 2010, 6:1613]. Here, the thermodynamics of sustaining gases (e.g. air) is considered. Governing equations are presented along with a solution methodology to determine a critical condition to sustain gases. The critical roughness scale to sustain gases is estimated for different degrees of saturation of gases dissolved in the liquid. It is shown that roughness spacings of less than a micron are essential to sustain gases on surfaces submerged in water at atmospheric pressure. This is consistent with prior empirical data.

  1. Nanoscale Surface and Interface Mechanics of Elastic-Plastic Media with Smooth, Patterned, and Rough Surfaces

    E-Print Network [OSTI]

    Yin, Xi

    2011-01-01T23:59:59.000Z

    patterning, rough surface topography, interfacial adhesion,media with fractal surface topographies. J. Tribol. 123,representative of the 3D surface topography. A 2D profile of

  2. Lyapunov instability of rough hard-disk fluids

    E-Print Network [OSTI]

    Jacobus A. van Meel; Harald A. Posch

    2009-04-02T23:59:59.000Z

    The dynamical instability of rough hard-disk fluids in two dimensions is characterized through the Lyapunov spectrum and the Kolmogorov-Sinai entropy, $h_{KS}$, for a wide range of densities and moments of inertia $I$. For small $I$ the spectrum separates into translation-dominated and rotation-dominated parts. With increasing $I$ the rotation-dominated part is gradually filled in at the expense of translation, until such a separation becomes meaningless. At any density, the rate of phase-space mixing, given by $h_{KS}$, becomes less and less effective the more the rotation affects the dynamics. However, the degree of dynamical chaos, measured by the maximum Lyapunov exponent, is only enhanced by the rotational degrees of freedom for high-density gases, but is diminished for lower densities. Surprisingly, no traces of Lyapunov modes were found in the spectrum for larger moments of inertia. The spatial localization of the perturbation vector associated with the maximum exponent however persists for any $I$.

  3. Introduction to the Special Issue on Rough Sets and Soft Computing.

    E-Print Network [OSTI]

    Lin, Tsau Young

    of information systems. From the outset, rough set theory has been a methodology of database mining or knowledge, neighborhood systems, neural network, and soft computing. In real world applications, we see papers in Introduction to the Special Issue on Rough Sets and Soft Computing. T. Y. Lin Department

  4. Roughness Tolerance Studies for the Undulator Beam Pipe Chamber of LCLS-II

    E-Print Network [OSTI]

    Bane, K

    2014-01-01T23:59:59.000Z

    We investigate the effect of wall roughness on the wakefield-induced energy variation in the undulator beam pipe of LCLS-II. We find that a wall roughness equivalent to an rms surface slope of 30 mr increases the total induced energy variation within the bunch (due to the resistive wall wake) by a modest 20%.

  5. EFFECT OF CONTACT VISCOSITY AND ROUGHNESS ON INTERFACE STIFFNESS AND WAVE PROPAGATION

    E-Print Network [OSTI]

    Boyer, Edmond

    EFFECT OF CONTACT VISCOSITY AND ROUGHNESS ON INTERFACE STIFFNESS AND WAVE PROPAGATION Anil Misra1 and asperity properties compete in determining the stiffness behavior, and consequently, the wave propagation widely used to investigate plane wave propagation through contacts between two rough solids [see

  6. Surface roughness and geological mapping at sub-hectometer scale from the High

    E-Print Network [OSTI]

    Cord, Aurélien

    and characterized in terms of roughness. Key words: Geological Processes, Impact Processes, Image Processing, Mars valuable insights into the characterization of and discrimination between these geological processesSurface roughness and geological mapping at sub-hectometer scale from the High Resolution Stereo

  7. A FETCH DEPENDENT MODEL OF SEA SURFACE ROUGHNESS FOR OFFSHORE WIND POWER UTILISATION

    E-Print Network [OSTI]

    Heinemann, Detlev

    , Resources, Roughness, Coastal Sea Areas, Waves, Rødsand 1 INTRODUCTION Large offshore wind farms are beingA FETCH DEPENDENT MODEL OF SEA SURFACE ROUGHNESS FOR OFFSHORE WIND POWER UTILISATION Bernhard Lange wind conditions of offshore sites, since the higher energy yield has to compensate the additional

  8. Dependence of friction on roughness, velocity, and temperature Martin Dub,2

    E-Print Network [OSTI]

    Grant, Martin

    - faces were discovered long ago by Da Vinci, Amonton, and Coulomb. They found that friction is i, and friction at the macroscopic level is now well understood, for both dry rough 3 and lubricated surfaces 4Dependence of friction on roughness, velocity, and temperature Yi Sang,1 Martin Dubé,2 and Martin

  9. Lyapunov instability of rough hard-disk fluids Jacobus A. van Meel*

    E-Print Network [OSTI]

    Posch, Harald A.

    Lyapunov instability of rough hard-disk fluids Jacobus A. van Meel* FOM Institute for Atomic The dynamical instability of rough hard-disk fluids in two dimensions is characterized through the Lyapunov, measured by the maximum Lyapunov exponent, is only enhanced by the rotational degrees of freedom for high

  10. Optimization of central receiver concentrated solar thermal : site selection, heliostat layout & canting

    E-Print Network [OSTI]

    Noone, Corey J. (Corey James)

    2011-01-01T23:59:59.000Z

    In this thesis, two new models are introduced for the purposes of (i) locating sites in hillside terrain suitable for central receiver solar thermal plants and (ii) optimization of heliostat field layouts for any terrain. ...

  11. UBC Social Ecological Economic Development Studies (SEEDS) Student Report Travis Wade

    E-Print Network [OSTI]

    GRYPHON: LCA of electric vs. diesel all-terrain vehicles CEEN 523 December 11, 2013 999 1453 University, Development Studies (SEEDS) Student Report PROJECT GRYPHON: LCA of electric vs. diesel all-terrain vehicles ............................................................................................. 7 3 Diesel Vehicle

  12. Tandem mobile robot system

    DOE Patents [OSTI]

    Buttz, James H. (Albuquerque, NM); Shirey, David L. (Albuquerque, NM); Hayward, David R. (Albuquerque, NM)

    2003-01-01T23:59:59.000Z

    A robotic vehicle system for terrain navigation mobility provides a way to climb stairs, cross crevices, and navigate across difficult terrain by coupling two or more mobile robots with a coupling device and controlling the robots cooperatively in tandem.

  13. AN AUTOMATED SYSTEM FOR SYSTEMATIC TESTING OF LOCOMOTION ON HETEROGENEOUS GRANULAR MEDIA*

    E-Print Network [OSTI]

    Goldman, Daniel I.

    robotic locomotors like PackBot or RHex (Figure 1a) travel across these "flowable" types of terrain [1]). Figure 1 Natural heterogeneous terrain. (a) RHex robot traveling across heterogeneous gravel substrate

  14. Near-field heat transfer between a nanoparticle and a rough surface

    E-Print Network [OSTI]

    Svend-Age Biehs; Jean-Jacques Greffet

    2011-03-11T23:59:59.000Z

    In this work we focus on the surface roughness correction to the near-field radiative heat transfer between a nanoparticle and a material with a rough surface utilizing a direct perturbation theory up to second order in the surface profile. We discuss the different distance regimes for the local density of states above the rough material and the heat flux analytically and numerically. We show that the heat transfer rate is larger than that corresponding to a flat surface at short distances. At larger distances it can become smaller due to surface polariton scattering by the rough surface. For distances much smaller than the correlation length of the surface profile, we show that the results converge to a proximity approximation, whereas in the opposite limit the rough surface can be replaced by an equivalent surface layer.

  15. THESE DE DOCTORAT DE L'UNIVERSITE PIERRE ET MARIE CURIE

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Téhéran puis sur le terrain, avec un grand merci à Hamid Nazari et Mohammad Foroutan, grâce à qui les

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

    E-Print Network [OSTI]

    Larson, Jacoby

    2011-01-01T23:59:59.000Z

    those areas that are the most hazardous. Classificationin the area of mobility in the face of hazardous terrain.

  17. 11. THIS ITEM APPLIES TO AMENDMENTS OF SOLICITATIONS 0 The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offers 0 is extended, 0 is not extended.

    E-Print Network [OSTI]

    the influence of terrain properties on the ecosystem or other variables of interest including the human systems

  18. Digital Object Identifier (DOI) 10.1007/s00138-002-0097-7 Machine Vision and Applications (2003) 14: 514 Machine Vision and

    E-Print Network [OSTI]

    Pollefeys, Marc

    2003-01-01T23:59:59.000Z

    of the planetary terrain is computed, and for controlling the motion of the rover, using light emitting diodes

  19. THE OHIO STATE UNIVERSITY DEPARTMENT OF GEOGRAPHY

    E-Print Network [OSTI]

    Howat, Ian M.

    ) and built patented 3D models of terrain which prefigured today's "3D printing." In the concluding part

  20. Larzillire, Pnloe (2007) Islamisme et nationalisme dans les Territoires palestiniens de la premire la seconde Intifada in Khoury, G., Mouchy, N. (dir.), Etats et Socits de l'Orient

    E-Print Network [OSTI]

    2007-01-01T23:59:59.000Z

    factions de gauche, on assiste, sur le terrain de la mobilisation politique, à une quasi-disparition du

  1. The effect of ice crystal surface roughness on the retrieval of ice cloud microphysical and optical properties

    E-Print Network [OSTI]

    Xie, Yu

    2007-09-17T23:59:59.000Z

    The effect of the surface roughness of ice crystals is not routinely accounted for in current cloud retrieval algorithms that are based on pre-computed lookup libraries. In this study, we investigate the effect of ice crystal surface roughness...

  2. Reduction of vortex induced forces and motion through surface roughness control

    DOE Patents [OSTI]

    Bernitsas, Michael M; Raghavan, Kamaldev

    2014-04-01T23:59:59.000Z

    Roughness is added to the surface of a bluff body in a relative motion with respect to a fluid. The amount, size, and distribution of roughness on the body surface is controlled passively or actively to modify the flow around the body and subsequently the Vortex Induced Forces and Motion (VIFM). The added roughness, when designed and implemented appropriately, affects in a predetermined way the boundary layer, the separation of the boundary layer, the level of turbulence, the wake, the drag and lift forces, and consequently the Vortex Induced Motion (VIM), and the fluid-structure interaction. The goal of surface roughness control is to decrease/suppress Vortex Induced Forces and Motion. Suppression is required when fluid-structure interaction becomes destructive as in VIM of flexible cylinders or rigid cylinders on elastic support, such as underwater pipelines, marine risers, tubes in heat exchangers, nuclear fuel rods, cooling towers, SPAR offshore platforms.

  3. Boundary-Layer Receptivity to Three-Dimensional Roughness Arrays on a Swept-Wing

    E-Print Network [OSTI]

    Hunt, Lauren Elizabeth

    2012-02-14T23:59:59.000Z

    is required. This study uses detailed hotwire boundary-layer velocity scans to quantify the relationship between roughness height and initial disturbance amplitude. Naphthalene flow visualization provides insight into how transition changes as a result...

  4. Thermoelectric characteristic of the rough InN/GaN core-shell nanowires

    SciTech Connect (OSTI)

    Wu, Chao-Wei; Wu, Yuh-Renn, E-mail: yrwu@ntu.edu.tw [Graduate Institute of Photonics and Optoelectronics and Department of Electrical Engineering, National Taiwan University, Taipei 10617, Taiwan (China)

    2014-09-14T23:59:59.000Z

    An analysis to model the thermoelectric (TE) effects of the rough InN/GaN core-shell nanowires (NWs) with wire diameter ranging from 25?nm to 100?nm is proposed. The elastic continuum model is employed to calculate the phonon dispersion relation curves and the related phonon group velocity. Within the framework of Boltzmann transport equations and relaxation time approximation, the electrical conductivity, Seebeck coefficient, electronic thermal conductivity, and the lattice thermal conductivity is obtained. Simulation results indicate that TE properties of the rough InN/GaN core-shell NWs are strongly affected by the surface roughness and the diameter of NWs. The optimized condition of the proposed rough InN/GaN core-shell TE NWs is studied in this paper and the highest ZT obtained in the calculation is 0.8598 at 300?K and 1.713 at 1000?K.

  5. A construction of the rough path above fractional Brownian motion using Volterra’s representation

    E-Print Network [OSTI]

    Nualart, David; Tindel, Samy

    2011-09-01T23:59:59.000Z

    This note is devoted to construct a rough path above a multidimensional fractional Brownian motion B with any Hurst parameter H?(0,?1), by means of its representation as a Volterra Gaussian process. This approach yields ...

  6. Enhancement of vortex induced forces and motion through surface roughness control

    DOE Patents [OSTI]

    Bernitsas, Michael M. (Saline, MI); Raghavan, Kamaldev (Houston, TX)

    2011-11-01T23:59:59.000Z

    Roughness is added to the surface of a bluff body in a relative motion with respect to a fluid. The amount, size, and distribution of roughness on the body surface is controlled passively or actively to modify the flow around the body and subsequently the Vortex Induced Forces and Motion (VIFM). The added roughness, when designed and implemented appropriately, affects in a predetermined way the boundary layer, the separation of the boundary layer, the level of turbulence, the wake, the drag and lift forces, and consequently the Vortex Induced Motion (VIM), and the fluid-structure interaction. The goal of surface roughness control is to increase Vortex Induced Forces and Motion. Enhancement is needed in such applications as harnessing of clean and renewable energy from ocean/river currents using the ocean energy converter VIVACE (Vortex Induced Vibration for Aquatic Clean Energy).

  7. Dual frequency microwave radiometer measurements of soil moisture for bare and vegetated rough surfaces

    E-Print Network [OSTI]

    Lee, Siu Lim

    1974-01-01T23:59:59.000Z

    DUAL FREQUENCY MICROWAVE RADIOMETER MEASUREMENTS OF SOIL MOISTURE FOR BARE AND VEGETATED ROUGH SURFACES A Thesis by SIU LIM LEE Submitted to the Graduate College of Texas A(M University in partial fulfillment of the requirement for the degree... of MASTER OF SCIENCE August 1974 Major Subject: Electrical Engineering DUAL FREQUENCY MICROWAVE RADIOMETER MEASUREMENTS OF' SOIL MOISTURE FOR BARE AND VEGETATED ROUGH SURFACES A Thesis by SIU LIM LEE Approved as to style and content by: (C rman...

  8. Stochastic modeling of random roughness in shock scattering problems: theory and simulations

    SciTech Connect (OSTI)

    Lin, Guang; Su, Chau-Hsing; Karniadakis, George E.

    2008-08-01T23:59:59.000Z

    Random rougness is omnipresent in engineering applications and may often affect performance in unexpected way. Here, we employ synergistically stochastic simulations and second-order stochastic perturbation analysis to study supersonic flow past a wedge with random rough surface. The roughness (of length $d$) starting at the wedge apex is modeled as stochastic process (with zero mean and correlation length $A$) obtained from a new stochastic differential equation. A multi-element probabilistic collocation method (ME-PCM) based on {\\em sparse grids} is employed to solve the stochastic Euler equations while a WENO scheme is used to discretize the equations in two spatial dimensions. The perturbation analysis is used to verify the stochastic simulations and to provide insight for small values of $A$, where stochastic simulations become prohibitively expensive. % We show that the random roughness enhances the lift and drag forces on the wedge beyond the rough region, and this enhancement is proportional to $(d/A)^2$. The effects become more pronounced as the Mach number increases. These results can be used in designing smart rough skins for airfoils for maxiumum lift enhancement at a minimum drag penalty.

  9. The friction factor of two-dimensional rough-boundary turbulent soap film flows

    E-Print Network [OSTI]

    Nicholas Guttenberg; Nigel Goldenfeld

    2009-03-25T23:59:59.000Z

    We use momentum transfer arguments to predict the friction factor $f$ in two-dimensional turbulent soap-film flows with rough boundaries (an analogue of three-dimensional pipe flow) as a function of Reynolds number Re and roughness $r$, considering separately the inverse energy cascade and the forward enstrophy cascade. At intermediate Re, we predict a Blasius-like friction factor scaling of $f\\propto\\textrm{Re}^{-1/2}$ in flows dominated by the enstrophy cascade, distinct from the energy cascade scaling of $\\textrm{Re}^{-1/4}$. For large Re, $f \\sim r$ in the enstrophy-dominated case. We use conformal map techniques to perform direct numerical simulations that are in satisfactory agreement with theory, and exhibit data collapse scaling of roughness-induced criticality, previously shown to arise in the 3D pipe data of Nikuradse.

  10. Multiscale characterization method for line edge roughness based on redundant second generation wavelet transform

    SciTech Connect (OSTI)

    Wang Fei; Zhao Xuezeng [School of Mechanical and Electronic Engineering, Harbin Institute of Technology, Harbin 150001 (China); Li Ning [Shanghai Second Polytechnic University, Shanghai 201209 (China)

    2010-10-15T23:59:59.000Z

    We introduce a multiscale characterization method for line edge roughness (LER) based on redundant second generation wavelet transform. This method involves decomposing LER characteristics into independent bands with different spatial frequency components at different scales, and analyzing the reconstructed signals to work out the roughness exponent, the spatial frequency distribution characteristics, as well as the rms value. The effect of noise can be predicted using detailed signals in the minimum space of scale. This method was applied to numerical profiles for validation. Results show that according to the line edge profiles with similar amplitudes, the roughness exponent R can effectively reflect the degree of irregularity of LER and intuitively provide information on LER spatial frequency distribution.

  11. Validity of the thin mask approximation in extreme ultraviolet mask roughness simulations

    SciTech Connect (OSTI)

    Naulleau, Patrick; George, Simi

    2011-01-26T23:59:59.000Z

    In the case of extreme ultraviolet (EUV) lithography, modeling has shown that reflector phase roughness on the lithographic mask is a significant concern due to the image plan speckle it causes and the resulting line-edge roughness on imaged features. Modeling results have recently been used to determine the requirements for future production worthy masks yielding the extremely stringent specification of 50 pm rms roughness. Owing to the scale of the problem in terms of memory requirements, past modeling results have all been based on the thin mask approximation. EUV masks, however, are inherently three dimensional in nature and thus the question arises as to the validity of the thin mask approximation. Here we directly compare image plane speckle calculation results using the fast two dimensional thin mask model to rigorous finite-difference time-domain results and find the two methods to be comparable.

  12. Surface roughness of stainless-steel mirrors for focusing soft x rays

    SciTech Connect (OSTI)

    Yashchuk, Valeriy V.; Gullikson, Eric M.; Howells, Malcolm R.; Irick, Steve C.; MacDowell, Alastair A.; McKinney, Wayne R.; Salmassi, Farhad; Warwick, Tony; Metz, James P.; Tonnessen, Thomas W

    2006-07-10T23:59:59.000Z

    We have used polished stainless steel as a mirror substrate to provide focusing of soft x rays in grazing-incidence reflection. The critical issue of the quality of the steel surface,polished and coated with gold, is discussed in detail. A comparison is made to a polished,gold-coated, electroless nickel surface, which provides a smoother finish. We used the surface height distributions, measured with an interferometric microscope and complemented by atomic-force microscope measurements, to compute power spectral densities and then to evaluate the surface roughness. The effects of roughness in reducing the specular reflectivity were verified by soft-x-ray measurements.

  13. Remotely controlled sensor apparatus for use in dig-face characterization system

    DOE Patents [OSTI]

    Josten, N.E.; Svoboda, J.M.

    1999-05-25T23:59:59.000Z

    A remotely controlled sensor platform apparatus useful in a dig-face characterization system is deployed from a mobile delivery device such as standard heavy construction equipment. The sensor apparatus is designed to stabilize sensors against extraneous motions induced by heavy equipment manipulations or other outside influences, and includes a terrain sensing and sensor elevation control system to maintain the sensors in close ground proximity. The deployed sensor apparatus is particularly useful in collecting data in work environments where human access is difficult due to the presence of hazardous conditions, rough terrain, or other circumstances that prevent efficient data collection by conventional methods. Such work environments include hazardous waste sites, unexploded ordnance sites, or construction sites. Data collection in these environments by utilizing the deployed sensor apparatus is desirable in order to protect human health and safety, or to assist in planning daily operations to increase efficiency. 13 figs.

  14. Remotely controlled sensor apparatus for use in dig-face characterization system

    DOE Patents [OSTI]

    Josten, Nicholas E. (Idaho Falls, ID); Svoboda, John M. (Idaho Falls, ID)

    1999-01-01T23:59:59.000Z

    A remotely controlled sensor platform apparatus useful in a dig-face characterization system is deployed from a mobile delivery device such as standard heavy construction equipment. The sensor apparatus is designed to stabilize sensors against extraneous motions induced by heavy equipment manipulations or other outside influences, and includes a terrain sensing and sensor elevation control system to maintain the sensors in close ground proximity. The deployed sensor apparatus is particularly useful in collecting data in work environments where human access is difficult due to the presence of hazardous conditions, rough terrain, or other circumstances that prevent efficient data collection by conventional methods. Such work environments include hazardous waste sites, unexploded ordnance sites, or construction sites. Data collection in these environments by utilizing the deployed sensor apparatus is desirable in order to protect human health and safety, or to assist in planning daily operations to increase efficiency.

  15. Numerical method for calculating the apparent eddy current conductivity loss on randomly rough surfaces

    E-Print Network [OSTI]

    Nagy, Peter B.

    Numerical method for calculating the apparent eddy current conductivity loss on randomly rough Because of their frequency-dependent penetration depth, eddy current measurements are capable of mapping of eddy current conductivity, thereby decreasing the accuracy of the measurements, especially in thermally

  16. A simple numerical model of the apparent loss of eddy current conductivity due to surface roughness

    E-Print Network [OSTI]

    Nagy, Peter B.

    A simple numerical model of the apparent loss of eddy current conductivity due to surface roughness of eddy current conductivity has been suggested as a possible means to allow the nondestructive evaluation, the path of the eddy current must follow a more tortuous route in the material, which produces a reduction

  17. Geometrical and transport properties of single fractures: influence of the roughness of the fracture

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    and more particularly in the design and safety of nuclear power plants or cryotechnic rocket engines, where space is found to be crucially function of the failure mechanism (brittle, quasi brittle or plastic influencing the structure of the void space. Studies devoted to the characterization of the surface roughness

  18. Optimization of Hard Material Roughing by means of a Stability , M. Zatarain2

    E-Print Network [OSTI]

    Boyer, Edmond

    Self-excited vibrations limit the productivity of aluminium and steel roughing. During aluminium they are associated to the structure of the machine tool (low frequency). For aluminium, the dynamic characterisation the usual one applied in light alloys. The proposed model is verified experimentally in a practical case

  19. Hydro-thermal flow in a rough fracture EC Contract SES6-CT-2003-502706

    E-Print Network [OSTI]

    Schmittbuhl, Jean

    Hydro-thermal flow in a rough fracture EC Contract SES6-CT-2003-502706 PARTICIPANT ORGANIZATION NAME: CNRS Synthetic 2nd year report Related with Work Package............ HYDRO-THERMAL FLOW in the influence of a realistic geometry of the fracture on its hydro-thermal response. Several studies have

  20. Tsunami generated by a granular collapse down a rough inclined S. Viroulet1

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    epl draft Tsunami generated by a granular collapse down a rough inclined plane S. Viroulet1 , A Jersey 08544, USA PACS 47.57.Gc ­ Granular flow, complex fluids PACS 92.10.hl ­ Tsunamis PACS 45.70.Ht wave and the evolution of its amplitude during the propagation. The experiments show that whereas

  1. Measurement of friction noise versus contact area of rough surfaces weakly loaded

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    contact area. The friction-induced vibration is generated by the sliding of two rough surfaces. The normal load is low leading to a weak contact. The normal load and the sliding velocity are maintained constant], friction noises can be classified in two types depending on the contact pressure. When the contact pressure

  2. Sensitivity of Swept-Wing, Boundary-Layer Transition to Spanwise-Periodic Discrete Roughness Elements

    E-Print Network [OSTI]

    West, David Edward

    2014-12-12T23:59:59.000Z

    Micron-sized, spanwise-periodic, discrete roughness elements (DREs) were applied to and tested on a 30° swept-wing model in order to study their effects on boundary-layer transition in flight where stationary crossflow waves are the dominant...

  3. Atmospheric Momentum Roughness Applied to Stage-Discharge Relationships in Flood Plains

    E-Print Network [OSTI]

    to Manning's formula. The Task Force on Friction Factors in Open Channel 1963 found that Manning's formula's formula in heavily vegetated or urbanized areas is particularly problematic Task Force on Friction Factors is the relationship among wind speed, friction velocity, and the surface roughness that was developed from Prandtl

  4. Importance of thermal effects and sea surface roughness for offshore wind resource assessment

    E-Print Network [OSTI]

    Heinemann, Detlev

    sites. The first large offshore wind farms are currently being built in several countries in EuropeImportance of thermal effects and sea surface roughness for offshore wind resource assessment National Laboratory, Roskilde, Denmark Abstract The economic feasibility of offshore wind power utilisation

  5. ROUGH SURFACES OF TITANIUM AND TITANIUM ALLOYS FOR IMPLANTS AND PROSTHESES

    E-Print Network [OSTI]

    Boyer, Edmond

    ROUGH SURFACES OF TITANIUM AND TITANIUM ALLOYS FOR IMPLANTS AND PROSTHESES 1 E. Conforto, 2 B. Abstract Titanium and titanium alloys for dental implants and hip prostheses were surface-treated and and the stability of the implant. The microstructure of titanium and titanium alloys submitted to these treatments

  6. Rough-Fuzzy C-Medoids Algorithm and Selection of Bio-Basis for Amino Acid

    E-Print Network [OSTI]

    Pal, Sankar Kumar

    of protein data sets. Index Terms--Pattern recognition, data mining, c-medoids algorithm, fuzzy sets, rough Pradipta Maji and Sankar K. Pal, Fellow, IEEE Abstract--In most pattern recognition algorithms, amino acids pattern recognition algorithms to analyze these biological subsequences is that they cannot recognize

  7. Soft data mining, computational theory of perceptions, and rough-fuzzy approach

    E-Print Network [OSTI]

    Pal, Sankar Kumar

    is described from pattern recognition point of view along with the relevance of soft computing. Key features of the computational theory of perceptions and its significance in pattern recognition and knowledge dis- covery, and its modeling through rough-fuzzy integration are discussed. Merits of fuzzy granular computation

  8. Class-dependent rough-fuzzy granular space, dispersion index and classification

    E-Print Network [OSTI]

    Pal, Sankar Kumar

    granular computing Soft computing Pattern recognition Remote sensing a b s t r a c t A new rough-fuzzy model for pattern classification based on granular computing is described in the present article. In this model, we propose the formulation of class-dependent granules in fuzzy environment. Fuzzy membership

  9. FRICTION FACTOR IN HIGH PRESSURE NATURAL GAS PIPELINES FROM ROUGHNESS MEASUREMENTS

    E-Print Network [OSTI]

    Gudmundsson, Jon Steinar

    FRICTION FACTOR IN HIGH PRESSURE NATURAL GAS PIPELINES FROM ROUGHNESS MEASUREMENTS DETERMINATION DU and Technology, Norway ABSTRACT Pressure drop experiments on natural gas flow at 80 to 120 bar pressure and high of natural gas at typical operating pressures (100-180 bar). At such Reynolds numbers the classical Colebrook

  10. An FDTD Method for Analysis of Scattering from Rough FluidFluid Interfaces

    E-Print Network [OSTI]

    Schneider, John B.

    results are presented for fluid­fluid cases modeling water­sediment inter­ faces. Two different roughness speeds in shallow­water sediment bottoms are relatively slow, a fluid­ fluid model is a reasonable to the interface, and a correc­ tion for the numerical dispersion inherent to the FDTD algorithm. Numeri­ cal

  11. Equivalent roughness height for plane bed under oscillatory flow Benoi^t Camenen a,*, Magnus Larson b

    E-Print Network [OSTI]

    US Army Corps of Engineers

    of a flat and fixed bed is given in terms of the Nikuradse roughness height (ks). For flat beds larger than for a fixed bed. This is probably caused by the increased energy dissipation in the sheetEquivalent roughness height for plane bed under oscillatory flow Benoi^t Camenen a,*, Magnus Larson

  12. 486 IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, VOL. 17, NO. 7, JULY 2007 Estimation of Roughness-Induced Power Absorption

    E-Print Network [OSTI]

    Tsang, Leung

    it to predict the roughness effect on power loss. Index Terms--Power absorption, power spectral density (PSD significant additional power loss that can be detrimental for insertion loss limited designs. We recently interconnect surfaces and use it to estimate corresponding roughness-induced power loss. The 2-D PSD

  13. The effect of ice crystal surface roughness on the retrieval of ice cloud microphysical and optical properties 

    E-Print Network [OSTI]

    Xie, Yu

    2007-09-17T23:59:59.000Z

    on the retrieval of ice cloud effective particle size, optical thickness and cloud-top temperature. Three particle surface conditions, smooth, moderately rough and deeply rough, are considered in the visible and near-infrared channels (0.65 and 3.75 Ã...

  14. Electrochemical machining process for forming surface roughness elements on a gas turbine shroud

    DOE Patents [OSTI]

    Lee, Ching-Pang (Cincinnati, OH); Johnson, Robert Alan (Simpsonville, SC); Wei, Bin (Mechanicville, NY); Wang, Hsin-Pang (Rexford, NY)

    2002-01-01T23:59:59.000Z

    The back side recessed cooling surface of a shroud defining in part the hot gas path of a turbine is electrochemically machined to provide surface roughness elements and spaces therebetween to increase the heat transfer coefficient. To accomplish this, an electrode with insulating dielectric portions and non-insulating portions is disposed in opposition to the cooling surface. By passing an electrolyte between the cooling surface and electrode and applying an electrical current between the electrode and a shroud, roughness elements and spaces therebetween are formed in the cooling surface in opposition to the insulating and non-insulating portions of the electrode, hence increasing the surface area and heat transfer coefficient of the shroud.

  15. Energy production rates in fluid mixtures of inelastic rough hard spheres

    E-Print Network [OSTI]

    Andrés Santos; Gilberto M. Kremer; Vicente Garzó

    2010-07-16T23:59:59.000Z

    The aim of this work is to explore the combined effect of polydispersity and roughness on the partial energy production rates and on the total cooling rate of a granular fluid mixture. We consider a mixture of inelastic rough hard spheres of different number densities, masses, diameters, moments of inertia, and mutual coefficients of normal and tangential restitution. Starting from the first equation of the BBGKY hierarchy, the collisional energy production rates associated with the translational and rotational temperatures ($T_i^\\text{tr}$ and $T_i^\\text{rot}$) are expressed in terms of two-body average values. Next, those average values are estimated by assuming a velocity distribution function based on maximum-entropy arguments, allowing us to express the energy production rates and the total cooling rate in terms of the partial temperatures and the parameters of the mixture. Finally, the results are applied to the homogeneous cooling state of a binary mixture and the influence of inelasticity and roughness on the temperature ratios $T_1^\\text{tr}/T_1^\\text{rot}$, $T_2^\\text{tr}/T_1^\\text{tr}$, and $T_2^\\text{rot}/T_1^\\text{rot}$ is analyzed.

  16. Effect of the porosity on the fracture surface roughness of sintered materials: From anisotropic to isotropic self-affine scaling

    E-Print Network [OSTI]

    Tristan Cambonie; Jonathan Bares; Lamine Hattali; Daniel Bonamy; Véronique Lazarus; Harold Auradou

    2015-01-16T23:59:59.000Z

    To unravel how the microstructure affects the fracture surface roughness in heterogeneous brittle solids like rocks or ceramics, we characterized the roughness statistics of post-mortem fracture surfaces in home-made materials of adjustable microstructure length-scale and porosity, obtained by sintering monodisperse polystyrene beads. Beyond the characteristic size of disorder, the roughness profiles are found to exhibit self-affine scaling features evolving with porosity. Starting from a null value and increasing the porosity, we quantitatively modify the self-affine scaling properties from anisotropic (at low porosity) to isotropic (for porosity larger than 10 %).

  17. Single-layer MoS{sub 2} roughness and sliding friction quenching by interaction with atomically flat substrates

    SciTech Connect (OSTI)

    Quereda, J. [Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, Madrid E-28049 (Spain); Castellanos-Gomez, A. [Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft (Netherlands); Agraït, N. [Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, Madrid E-28049 (Spain); Instituto Madrileño de Estudios Avanzados en Nanociencia, IMDEA-Nanociencia, E-28049 Madrid (Spain); Instituto de Ciencia de Materiales Nicolás Cabrera, Campus de Cantoblanco, E-28049 Madrid (Spain); Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, E-28049 Madrid (Spain); Rubio-Bollinger, G., E-mail: gabino.rubio@uam.es [Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, Madrid E-28049 (Spain); Instituto de Ciencia de Materiales Nicolás Cabrera, Campus de Cantoblanco, E-28049 Madrid (Spain); Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, E-28049 Madrid (Spain)

    2014-08-04T23:59:59.000Z

    We experimentally study the surface roughness and the lateral friction force in single-layer MoS{sub 2} crystals deposited on different substrates: SiO{sub 2}, mica, and hexagonal boron nitride (h-BN). Roughness and sliding friction measurements are performed by atomic force microscopy. We find a strong dependence of the MoS{sub 2} roughness on the underlying substrate material, being h-BN the substrate which better preserves the flatness of the MoS{sub 2} crystal. The lateral friction also lowers as the roughness decreases, and attains its lowest value for MoS{sub 2} flakes on h-BN substrates. However, it is still higher than for the surface of a bulk MoS{sub 2} crystal, which we attribute to the deformation of the flake due to competing tip-to-flake and flake-to-substrate interactions.

  18. A New Multi-Gaussian Auto-Correlation Function for the Modeling of Realistic Shot Peened Random Rough Surfaces

    SciTech Connect (OSTI)

    Hassan, W. [Honeywell Aerospace, 111 S. 34th Street, M/S 503-118 Phoenix, AZ 85034 (United States); Blodgett, M. [Air Force Research Laboratory (AFRL/MLLP), 2230 10th Street, Suite 1, Dayton, OH 45433 (United States)

    2006-03-06T23:59:59.000Z

    Shot peening is the primary surface treatment used to create a uniform, consistent, and reliable sub-surface compressive residual stress layer in aero engine components. A by-product of the shot peening process is random surface roughness that can affect the measurements of the resulting residual stresses and therefore impede their NDE assessment. High frequency eddy current conductivity measurements have the potential to assess these residual stresses in Ni-base super alloys. However, the effect of random surface roughness is expected to become significant in the desired measurement frequency range of 10 to 100 MHz. In this paper, a new Multi-Gaussian (MG) auto-correlation function is proposed for modeling the resulting pseudo-random rough profiles. Its use in the calculation of the Apparent Eddy Current Conductivity (AECC) loss due to surface roughness is demonstrated. The numerical results presented need to be validated with experimental measurements.

  19. Turbulent Friction in Rough Pipes and the Energy Spectrum of the Phenomenological Theory

    E-Print Network [OSTI]

    G. Gioia; Pinaki Chakraborty

    2005-12-20T23:59:59.000Z

    The classical experiments on turbulent friction in rough pipes were performed by J. Nikuradse in the 1930's. Seventy years later, they continue to defy theory. Here we model Nikuradse's experiments using the phenomenological theory of Kolmog\\'orov, a theory that is widely thought to be applicable only to highly idealized flows. Our results include both the empirical scalings of Blasius and Strickler, and are otherwise in minute qualitative agreement with the experiments; they suggest that the phenomenological theory may be relevant to other flows of practical interest; and they unveil the existence of close ties between two milestones of experimental and theoretical turbulence.

  20. Investigation of wall friction in noncircular ducts with a rough liner

    E-Print Network [OSTI]

    Tyler, John Charles

    1959-01-01T23:59:59.000Z

    section Density Viscosity Dimensions L5/Q L/Q m/L& m/LQ 1. The friction factors, Reynolds numbers, and. abso- lute roughnesses for fluid flow in ducts having a glass fiber liner have been calculated and plotted in the form of characteristic... distributed, it is essential that the wall friction phenomena associated with the particular duct design be understood. When fluid is passed through a duct, a static pressure drop occurs due to the friction forces which act between the fluid. particles...

  1. Ant Colony Optimization of Rough Set for HV Bushings Fault Detection

    E-Print Network [OSTI]

    Mpanza, J L

    2011-01-01T23:59:59.000Z

    Most transformer failures are attributed to bushings failures. Hence it is necessary to monitor the condition of bushings. In this paper three methods are developed to monitor the condition of oil filled bushing. Multi-layer perceptron (MLP), Radial basis function (RBF) and Rough Set (RS) models are developed and combined through majority voting to form a committee. The MLP performs better that the RBF and the RS is terms of classification accuracy. The RBF is the fasted to train. The committee performs better than the individual models. The diversity of models is measured to evaluate their similarity when used in the committee.

  2. Organic photosensitive cells grown on rough electrode with nano-scale morphology control

    DOE Patents [OSTI]

    Yang, Fan (Piscataway, NJ); Forrest, Stephen R. (Ann Arbor, MI)

    2011-06-07T23:59:59.000Z

    An optoelectronic device and a method for fabricating the optoelectronic device includes a first electrode disposed on a substrate, an exposed surface of the first electrode having a root mean square roughness of at least 30 nm and a height variation of at least 200 nm, the first electrode being transparent. A conformal layer of a first organic semiconductor material is deposited onto the first electrode by organic vapor phase deposition, the first organic semiconductor material being a small molecule material. A layer of a second organic semiconductor material is deposited over the conformal layer. At least some of the layer of the second organic semiconductor material directly contacts the conformal layer. A second electrode is deposited over the layer of the second organic semiconductor material. The first organic semiconductor material is of a donor-type or an acceptor-type relative to the second organic semiconductor material, which is of the other material type.

  3. Light emitting diode with high aspect ratio submicron roughness for light extraction and methods of forming

    DOE Patents [OSTI]

    Li, Ting (Ventura, CA)

    2011-04-26T23:59:59.000Z

    The surface morphology of an LED light emitting surface is changed by applying a reactive ion etch (RIE) process to the light emitting surface. High aspect ratio, submicron roughness is formed on the light emitting surface by transferring a thin film metal hard-mask having submicron patterns to the surface prior to applying a reactive ion etch process. The submicron patterns in the metal hard-mask can be formed using a low cost, commercially available nano-patterned template which is transferred to the surface with the mask. After subsequently binding the mask to the surface, the template is removed and the RIE process is applied for time duration sufficient to change the morphology of the surface. The modified surface contains non-symmetric, submicron structures having high aspect ratio which increase the efficiency of the device.

  4. Light emitting diode with high aspect ratio submicron roughness for light extraction and methods of forming

    DOE Patents [OSTI]

    Li, Ting

    2013-08-13T23:59:59.000Z

    The surface morphology of an LED light emitting surface is changed by applying a reactive ion etch (RIE) process to the light emitting surface. High aspect ratio, submicron roughness is formed on the light emitting surface by transferring a thin film metal hard-mask having submicron patterns to the surface prior to applying a reactive ion etch process. The submicron patterns in the metal hard-mask can be formed using a low cost, commercially available nano-patterned template which is transferred to the surface with the mask. After subsequently binding the mask to the surface, the template is removed and the RIE process is applied for time duration sufficient to change the morphology of the surface. The modified surface contains non-symmetric, submicron structures having high aspect ratio which increase the efficiency of the device.

  5. Water-waves modes trapped in a canal by a body with the rough surface

    E-Print Network [OSTI]

    G. Cardone; T. Durante; S. A. Nazarov

    2009-10-06T23:59:59.000Z

    The problem about a body in a three dimensional infinite channel is considered in the framework of the theory of linear water-waves. The body has a rough surface characterized by a small parameter $\\epsilon>0$ while the distance of the body to the water surface is also of order $\\epsilon$. Under a certain symmetry assumption, the accumulation effect for trapped mode frequencies is established, namely, it is proved that, for any given $d>0$ and integer $N>0$, there exists $\\epsilon(d,N)>0$ such that the problem has at least $N$ eigenvalues in the interval $(0,d)$ of the continuous spectrum in the case $\\epsilon\\in(0,\\epsilon(d,N)) $. The corresponding eigenfunctions decay exponentially at infinity, have finite energy, and imply trapped modes.

  6. Tax Credits, Rebates & Savings | Department of Energy

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

    Utility, MunicipalPublic Utility, Utility Savings Category: Fuel Cells, Photovoltaics Alteration of Terrain Permits (New Hampshire) This permit is required whenever a...

  7. (DOE/EIS-0285/SA-12): Supplement Analysis for the Transmission...

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

    managers. The subject corridor traverses mountainous terrain mostly owned by large timber companies. During routine patrols, tall, encroaching trees and vegetation issues...

  8. A long-term post-project evaluation of an urban stream restoration project (Baxter Creek, El Cerrito, California)

    E-Print Network [OSTI]

    Purcell, Alison

    2004-01-01T23:59:59.000Z

    and V. H. Resh. 1992. Strawberry Creek on the University of1995. Biography of an urban creek. Terrain. Berkeley Ecologythe restoration project at Baxter Creek improved habitat and

  9. 2011 NERSC NISE Awards Summary Table

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

    Research Turbulence over complex terrain: a wind energy perspective Dmitry Pekurovsky, University of California San Diego m1243 350,000 ASCR Computer Science Performance...

  10. Border Security | ornl.gov

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

    control, remote communication, unmanned aerial, and activated delay systems. At the heart of SSFL is a simulated border region of varied terrain including open grassy fields,...

  11. 2007-07-27

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

    phenomena and building the foundation for a clear and consistent understanding of this new energy terrain. Beyond this, precision measurements from the ILC could act as a...

  12. Characterization of photochemical pollution at different elevations in mountainous areas in Hong Kong

    E-Print Network [OSTI]

    2013-01-01T23:59:59.000Z

    mountainous terrain Part 2: mesoscale effects, Agr. ForestMany studies showed that mesoscale circulations like sea–when evidence for the mesoscale circulation was clear based

  13. COLE DOCTORALE SCIENCES DE L'HOMME ET DE LA SOCIET LABORATOIRE CEDETE EA 1210

    E-Print Network [OSTI]

    paroissiens de Saint Yves de La Source et de Saint Marceau, pour leur soutien. Sur le terrain, l'accès à l

  14. adaptive fast walking: Topics by E-print Network

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

    Electro conditions for stable dynamic walking on irregular terrain in general, and we design the mechanical system and the neural system by comparing biological concepts with...

  15. assessing natural system: Topics by E-print Network

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

    issue and review of the relevant military vehicle impact literature Alan B. Anderson a,*, Antonio J, and the International Society for Terrain-Vehicle Systems cosponsored a...

  16. Surface Roughness of Stainless Steel Bender Mirrors for FocusingSoft X-rays

    SciTech Connect (OSTI)

    Yashchuk, Valeriy V.; Gullikson, Eric M.; Howells, Malcolm R.; Irick, Steve C.; MacDowell, Alastair A.; McKinney, Wayne R.; Salmassi,Farhad; Warwick, Tony; Metz, James P.; Tonnessen, Thomas W.

    2005-10-11T23:59:59.000Z

    We have used polished stainless steel as a mirror substrate to provide focusing of soft x-rays in grazing incidence reflection. The substrate is bent to an elliptical shape with large curvature and high stresses in the substrate require a strong elastic material. Conventional material choices of silicon or of glass will not withstand the stress required. The use of steel allows the substrates to be polished and installed flat, using screws in tapped holes. The ultra-high-vacuum bender mechanism is motorized and computer controlled. These mirrors are used to deliver focused beams of soft x-rays onto the surface of a sample for experiments at the Advanced Light Source (ALS). They provide an illumination field that can be as small as the mirror demagnification allows, for localized study, and can be enlarged, under computer control,for survey measurements over areas of the surface up to several millimeters. The critical issue of the quality of the steel surface, polished and coated with gold, which limits the minimum achievable focused spot size is discussed in detail. Comparison is made to a polished, gold coated, electroless nickel surface, which provides a smoother finish. Surface measurements are presented as power spectral densities, as a function of spatial frequency. The surface height distributions measured with an interferometric microscope, and complemented by atomic force microscope measurements, are used to compute power spectral densities and then to evaluate the surface roughness. The effects of roughness in reducing the specular reflectivity are verified by soft x-ray measurements.

  17. Roughness of the SiC/SiO{sub 2} vicinal interface and atomic structure of the transition layers

    SciTech Connect (OSTI)

    Liu, Peizhi; Li, Guoliang; Duscher, Gerd, E-mail: gduscher@utk.edu [Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996 (United States); Sharma, Yogesh K.; Ahyi, Ayayi C.; Isaacs-Smith, Tamara; Williams, John R.; Dhar, Sarit [Department of Physics, Auburn University, Auburn, Alabama 36849 (United States)

    2014-11-01T23:59:59.000Z

    The SiC/SiO{sub 2} interface is generally considered to be the cause for the reduced electron mobility of SiC power devices. Previous studies have shown a correlation between the mobility and the transition layer width at the SiC/SiO{sub 2} interface. The authors investigated this interface with atomic resolution Z-contrast imaging and electron energy-loss spectroscopy, and discovered that this transition region was due to the roughness of the vicinal interface. The roughness of a vicinal interface consisted of atomic steps and facets deviating from the ideal off-axis cut plane. The authors conclude that this roughness is limiting the mobility in the channels of SiC MOSFETs.

  18. Detailed comparative study and a mechanistic model of resuspension of spherical particles from rough and smooth surfaces

    E-Print Network [OSTI]

    Shnapp, Ron

    2014-01-01T23:59:59.000Z

    Resuspension of solid particles by a tornado-like vortex from surfaces of different roughness is studied using a three-dimensional particle tracking velocimetry (3D-PTV) method. By utilizing the three-dimensional information on particle positions, velocities and accelerations before, during and after the resuspension (lift-off) event, we demonstrate that the resuspension efficiency is significantly higher from the rough surface, and propose a mechanistic model of this peculiar effect. The results indicate that for all Reynolds numbers tested, the resuspension rate, as well as particle velocities and accelerations, are higher over the rough surface, as compared to the smooth counterpart. The results and the model can help to improve modeling and analysis of resuspension rates in engineering and environmental applications.

  19. The impact of new short season rice varieties on drying and storage of rough rice in Texas

    E-Print Network [OSTI]

    Bhagia, Gobind Shewakram

    1967-01-01T23:59:59.000Z

    THE IMPACT OF NEW SHORT SEASON RICE VARIETIES ON DRYING AND STORAGE OF ROUGH RICE IN TEXAS A Thesis by GOBIND SHEWAKRAM BHAGIA Submitted to the Graduate College of the Texas A&M University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE January 1967 Ma)or Sub/ect: Agricultural Economics THE IMPACT OF NEW SHORT SEASON RICE VARIETIES ON DRYING AND STORAGE OF ROUGH RICE IN TEXAS A Thesis by GOBIND SHEWAKIUiM BHAGIA Approved as to style and oontent by...

  20. Tailoring interlayer coupling and coercivity in Co/Mn/Co trilayers by controlling the interface roughness

    SciTech Connect (OSTI)

    Zhang, Bin; Wu, Chii-Bin; Kuch, Wolfgang, E-mail: kuch@physik.fu-berlin.de [Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin (Germany)

    2014-06-21T23:59:59.000Z

    Epitaxial Co/Mn/Co trilayers with a wedged Mn layer were grown on Cu(001) and studied by magneto-optical Kerr effect measurements. The bottom Co film as well as the Mn film exhibits a layer-by-layer growth mode, which allows to modify both interface roughnesses on the atomic scale by tuning the thicknesses of the films to achieve a certain filling of their topmost atomic layers. The onset of antiferromagnetic order in the Mn layer at room temperature was found at thicknesses of 4.1 (4.8) and 3.4 (4.0) atomic monolayers (ML) for a filled (half-filled) topmost atomic layer of the bottom Co film in Mn/Co bilayers and Co/Mn/Co trilayers, respectively. Magnetization loops with only one step were found for a trilayer with half-filled topmost atomic layer of the bottom Co film, while loops with two separate steps have been observed in trilayers with an integer number of atomic layers in the bottom Co film. The coercivity of the top Co film shows an oscillation with 1 ML period as a function of the Mn thickness above 10 ML, which is interpreted as the influence of the atomic-scale control of the interface roughness on the interface exchange coupling between the antiferromagnetic Mn and the top ferromagnetic (FM) Co layer. The strength of the magnetic interlayer coupling between the top and bottom Co layers through the Mn layer for an integer number of atomic layers in the bottom Co layer, deduced from minor-loop measurements, exhibits an oscillation with a period of 2 ML Mn thickness, indicative of direct exchange coupling through the antiferromagnetic Mn layer. In addition, a long-period interlayer coupling of the two FM layers with antiparallel coupling maxima at Mn thicknesses of 2.5, 8.2, and 13.7 ML is observed and attributed to indirect exchange coupling of the Rudermann-Kittel-Kasuya-Yosida type.

  1. In-flight Receptivity Experiments on a 30-degree Swept-wing using Micron-sized Discrete Roughness Elements

    E-Print Network [OSTI]

    Carpenter, Andrew L.

    2010-01-16T23:59:59.000Z

    and operated at a chord Reynolds number of 6.5 to 7.5 million. Spanwise-periodic, micronsized discrete roughness elements were applied at the leading edge of the swept-wing in order to excite the most unstable crossflow wavelength and promote early boundary...

  2. Impact of surface roughness of Au core in Au/Pd coreeshell nanoparticles toward formic acid oxidation e Experiment and

    E-Print Network [OSTI]

    Liu, Fuqiang

    Impact of surface roughness of Au core in Au/Pd coreeshell nanoparticles toward formic acid h t s Unique Au/Pd coreeshell nanoparticles were synthesized via a galvanic replacement of Cu by Pd on hollow Au. Au/Pd coreeshell nanoparticles with smooth Au surface by adding Na2SO3 demonstrated highly

  3. The Effect of Inner Surface Roughness on Friction Factor in Horizontal Micro-A. J. Ghajar1

    E-Print Network [OSTI]

    Ghajar, Afshin J.

    The Effect of Inner Surface Roughness on Friction Factor in Horizontal Micro- tubes A. J. Ghajar1 1 blood vessels, a sound understanding of fluid flow in micro- scale channels and tubes is required of the transition region. II. LITERATURE REVIEW To fully understand the flow phenomenon inside of micro-tubes

  4. Polycrystal modelling of fatigue: pre-hardening and surface roughness effects on damage initiation for 304L stainless steel

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    of residual heat removal circuits of pressurized water reactors (PWR).The main purpose of this study surface (pre- hardening gradient, residual stresses and scratches), at the scale of the microstructure properties (roughness, residual stress and pre-hardening) and to the microstructure of the material

  5. 1216 IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 57, NO. 5, MAY 2009 Wave Propagation in a Randomly Rough

    E-Print Network [OSTI]

    Tsang, Leung

    and the power loss. The derived result is expressed in terms of a double Sommerfeld integral. The double propagation and power loss are illustrated as a function of roughness characteristics and waveguide thickness thickness, the waveguide model shows signif- icantly different power loss as compared to the plane

  6. Linear Algebra Research Project Rough Draft Nick Davis Camera Transformations in OpenGL ES 2.0

    E-Print Network [OSTI]

    Marzuola, Jeremy

    Linear Algebra Research Project Rough Draft Nick Davis Camera Transformations in OpenGL ES 2.0 Since the advent of the analog computer the power of visual display has played an integral part graphical output, including components designed solely for calculating graphics (Graphics Processing Units

  7. Lattice Boltzmann simulations in microfluidics: probing the no-slip boundary condition in hydrophobic, rough, and surface nanobubble laden microchannels

    E-Print Network [OSTI]

    Jens Harting; Christian Kunert; Jari Hyväluoma

    2009-10-19T23:59:59.000Z

    In this contribution we review recent efforts on investigations of the effect of (apparent) boundary slip by utilizing lattice Boltzmann simulations. We demonstrate the applicability of the method to treat fundamental questions in microfluidics by investigating fluid flow in hydrophobic and rough microchannels as well as over surfaces covered by nano- or microscale gas bubbles.

  8. GEOPHYSICAL RESEARCH LETTERS, VOL. 28, NO. 5, PAGES 811-814, MARCH 1, 2001 Parameterizing Tidal Dissipation over Rough

    E-Print Network [OSTI]

    Jayne, Steven

    of barotropic tidal energy. The first line of evidence comes from observations of mix- ing in the abyssal Brazil ocean, the energy flux carried by internal waves generated over rough topog- raphy dominates the energy issues. The first is whether including a parameterization for internal wave energy-flux in a model

  9. IDC Reengineering Phase 2 & 3 Rough Order of Magnitude (ROM) Cost Estimate Summary (Leveraged NDC Case).

    SciTech Connect (OSTI)

    Harris, James M.; Prescott, Ryan; Dawson, Jericah M.; Huelskamp, Robert M.

    2014-11-01T23:59:59.000Z

    Sandia National Laboratories has prepared a ROM cost estimate for budgetary planning for the IDC Reengineering Phase 2 & 3 effort, based on leveraging a fully funded, Sandia executed NDC Modernization project. This report provides the ROM cost estimate and describes the methodology, assumptions, and cost model details used to create the ROM cost estimate. ROM Cost Estimate Disclaimer Contained herein is a Rough Order of Magnitude (ROM) cost estimate that has been provided to enable initial planning for this proposed project. This ROM cost estimate is submitted to facilitate informal discussions in relation to this project and is NOT intended to commit Sandia National Laboratories (Sandia) or its resources. Furthermore, as a Federally Funded Research and Development Center (FFRDC), Sandia must be compliant with the Anti-Deficiency Act and operate on a full-cost recovery basis. Therefore, while Sandia, in conjunction with the Sponsor, will use best judgment to execute work and to address the highest risks and most important issues in order to effectively manage within cost constraints, this ROM estimate and any subsequent approved cost estimates are on a 'full-cost recovery' basis. Thus, work can neither commence nor continue unless adequate funding has been accepted and certified by DOE.

  10. Systematic analysis of Persson's contact mechanics theory of randomly rough elastic surfaces

    E-Print Network [OSTI]

    Wolf B. Dapp; Nikolay Prodanov; Martin H. Müser

    2014-06-24T23:59:59.000Z

    We systematically check explicit and implicit assumptions of Persson's contact mechanics theory. It casts the evolution of the pressure distribution ${\\rm Pr}(p)$ with increasing resolution of surface roughness as a diffusive process, in which resolution plays the role of time. The tested key assumptions of the theory are: (a) the diffusion coefficient is independent of pressure $p$, (b) the diffusion process is drift-free at any value of $p$, (c) the point $p=0$ acts as an absorbing barrier, i.e., once a point falls out of contact, it never reenters again, (d) the Fourier component of the elastic energy is only populated if the appropriate wave vector is resolved, and (e) it no longer changes when even smaller wavelengths are resolved. Using high-resolution numerical simulations, we quantify deviations from these approximations and find quite significant discrepancies in some cases. For example, the drift becomes substantial for small values of $p$, which typically represent points in real space close to a contact line. On the other hand, there is a significant flux of points reentering contact. These and other identified deviations cancel each other to a large degree, resulting in an overall excellent description for contact area, contact geometry, and gap distribution functions. Similar fortuitous error cancellations cannot be guaranteed under different circumstances, for instance when investigating rubber friction. The results of the simulations may provide guidelines for a systematic improvement of the theory.

  11. Variation of Solar Attenuation with Height in CAPLTER The atmosphere over rural and urbanized areas differs in many ways in relation to terrain influences and human-induced variations (e.g., heat, humidity, wind, and pollution). The sun's energy penetrate

    E-Print Network [OSTI]

    Hall, Sharon J.

    Variation of Solar Attenuation with Height in CAPLTER Abstract The atmosphere over rural on amounts of solar energy that are accumulated at any given time. These controls range from extraterrestrial of variability cascade into plant productivity, solar energy technology, and urban climate processes, in general

  12. Colloid deposition on non-ideal porous media: The influences of collector shape and roughness on the single-collector efficiency

    E-Print Network [OSTI]

    Saiers, James

    Colloid deposition on non-ideal porous media: The influences of collector shape and roughness on the single-collector efficiency James E. Saiers School of Environmental Studies, Yale University, New Haven changes in mineral-grain shape and surface roughness influence the single-collector contact efficiency (h

  13. IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, VOL. 40, NO. 7, JULY 2002 1605 Surface Roughness Characterizations of Sea Ice and

    E-Print Network [OSTI]

    Kurapov, Alexander

    , surface roughness data from airborne laser altimeter transects correlate well with MISR-derived estimates of surface roughness. In Antarctica, ablation-related blue-ice areas, which are difficult to distinguish from bare ice exposed by crevasses, are easily detected using multiangular data. These unusual ablation

  14. Atomic intermixing and interface roughness in short-period InAs/GaSb superlattices for infrared photodetectors

    SciTech Connect (OSTI)

    Ashuach, Y.; Lakin, E.; Kaufmann, Y. [Department of Materials Science and Engineering, Technion—Israel Institute of Technology, Haifa 32000 (Israel); Saguy, C. [Solid State Institute, Technion—Israel Institute of Technology, Haifa 32000 (Israel); Zolotoyabko, E., E-mail: zloto@tx.technion.ac.il [Department of Materials Science and Engineering, Technion—Israel Institute of Technology, Haifa 32000 (Israel); Solid State Institute, Technion—Israel Institute of Technology, Haifa 32000 (Israel)

    2014-09-28T23:59:59.000Z

    A set of advanced characterization methods, including high-resolution X-ray diffraction (measurements and simulations), cross-sectional scanning tunneling microscopy, and high-angle annular dark-field scanning transmission electron microscopy is applied to quantify the interface roughness and atomic intermixing (in both cation and anion sub-lattices) in short period (6–7?nm) InAs/GaSb superlattices intended for mid-wavelength (M) and long-wavelength (L) infrared detectors. The undesired atomic intermixing and interface roughness in the L-samples were found to be considerably lower than in the M-samples. In all specimens, anion intermixing is much higher than that in the cation sub-lattice. Possible origins of these findings are discussed.

  15. An experimental investigation of silicon wafer surface roughness and its effect on the full strength of plated metals

    SciTech Connect (OSTI)

    Spiers, G.D.

    1981-01-01T23:59:59.000Z

    Plated silicon wafers with surface roughness ranging from 0.4 to 130 microinches were subjected to tensile pull strength tests. Electroless Ni/electroless Cu/electroplated Cu and electroless Ni/electroplated Cu were the two types of plate contacts tested. It was found that smoother surfaces had higher pull strength than rougher, chemically etched surfaces. The presence of the electroless Cu layer was found to be important to adhesion. The mode of fracture of the contact as it left the silicon was studied, and it was found that in almost all cases separation was due to fracture of the bulk silicon phase. The correlation between surface roughness and mode of contact failure is presented and interpreted.

  16. 0 Riso-R-434 Wind Speed and Direction

    E-Print Network [OSTI]

    meteorological statistics for the area as it was considered a possible site for a nuclear power plant. \\ \\ Duringm I 0 Riso-R-434 t Wind Speed and Direction Changes due to Terrain Effects revealed-4000 Roskilde, Denmark May 1983 #12;RISÃ?-R-434 WIND SPEED AND DIRECTION CHANGES DUE TO TERRAIN EFFECTS

  17. Soil mineralogy trends in California landscapes R.C. Graham a,

    E-Print Network [OSTI]

    Ahmad, Sajjad

    Soil mineralogy trends in California landscapes R.C. Graham a, , A.T. O'Geen b a Soil & Water soil mineralogical trends: 1) granitic terrain of the Peninsular Ranges, 2) granitic terrain of life. Inherent soil fertility issues are often directly linked to soil mineralogy (e.g., Page et al

  18. 164 IEEE TRANSACTIONS ON NEURAL SYSTEMS AND REHABILITATION ENGINEERING, VOL. 18, NO. 2, APRIL 2010 Control of a Powered AnkleFoot Prosthesis

    E-Print Network [OSTI]

    Geyer, Hartmut

    Control of a Powered Ankle­Foot Prosthesis Based on a Neuromuscular Model Michael F. Eilenberg, Hartmut the difficulties of explicit terrain sensing. Specifically, the energy provided by the prosthesis was directly--Neuromuscular model, powered prosthesis, pros- thesis control, terrain adaptation. I. INTRODUCTION TODAY

  19. American Institute of Aeronautics and Astronautics AIAA-01-4597

    E-Print Network [OSTI]

    Manduchi, Roberto

    -situ volcanic rocks on the surface can indicate not only a source region, but can also be #12;American Institute of A are reserved by the copyright owner. AUTONOMOUS ROCK DETECTION FOR MARS TERRAIN Authors: V. Gor, R. Castano, R rock detection process for Martian terrain. A rock detection algorithm, based on this framework

  20. CSc-165 Spring 2014 Week 9(b) Adjusting avatar position in Height Maps

    E-Print Network [OSTI]

    Gordon, Scott

    extends AbstractInputAction { private SceneNode avatar; private float s = 0.01f; private Terrain camera code example 4[b]) MoveForwardAction.java: import sage.input.action.AbstractInputAction; import graphicslib3D.Point3D; import graphicslib3D.Matrix3D; import sage.terrain.*; public class MoveForwardAction

  1. Using the ARPS WSR-88D Data Remapper Keith Brewster

    E-Print Network [OSTI]

    Droegemeier, Kelvin K.

    variables dealing with the grid spacing, grid location, vertical stretching, terrain and map projection an ARPS terrain-following Cartesian grid. The program reads data from WSR-88D archive level-II tapes, from velocity (ms-1 ) interpolated to the three-dimensional ARPS grid. Optionally, the user may also direct

  2. The Bolund Experiment Design of Measurement Campaign using CFD

    E-Print Network [OSTI]

    determination of mean wind, wind gradients and turbulence intensity on potential wind turbine positions complex terrain for reliable estimation of power production and wind turbine loads. · Development of remote sensing techniques (Lidar) for measuring wind conditions in complex terrain, including

  3. Separate effects of surface roughness, wettability and porosity on boiling heat transfer and critical heat flux and optimization of boiling surfaces

    E-Print Network [OSTI]

    O'Hanley, Harrison Fagan

    2012-01-01T23:59:59.000Z

    The separate effects of surface wettability, porosity, and roughness on critical heat flux (CHF) and heat transfer coefficient (HTC) were examined using carefully-engineered surfaces. All test surfaces were prepared on ...

  4. Leukemia Prediction from Gene Expression Data---A Rough Set Approach Jianwen Fang, Jerzy W. Grzymala-Busse, Information and Telecommunication

    E-Print Network [OSTI]

    Kansas, University of

    . Grzymala-Busse, Information and Telecommunication Technology Center, University of Kansas, Lawrence, KS Data---A Rough Set Approach Jianwen Fang1,2 and Jerzy W. Grzymala-Busse1,3 1Bioinformatics Core

  5. The role of an interface on Ni film removal and surface roughness after irradiation by femtosecond laser pulses

    SciTech Connect (OSTI)

    Murphy, Ryan D. [Applied Physics Program, University of Michigan, Ann Arbor, Michigan 48109 (United States)] [Applied Physics Program, University of Michigan, Ann Arbor, Michigan 48109 (United States); Torralva, Ben [Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor, Michigan 48109 (United States)] [Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor, Michigan 48109 (United States); Yalisove, Steven M. [Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109 (United States)] [Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109 (United States)

    2013-05-06T23:59:59.000Z

    We have observed thin film removal from glass substrates after the irradiation of Ni films with femtosecond laser pulses in air. It was found that the material removal threshold and laser-induced morphology are dependent on film thickness. With decreasing thickness, material removal transitions from intra-film separation to removal at the Ni-glass interface. The Gaussian energy distribution of the laser pulse allows for intra-film separation in the annular region of the crater and interface separation in the center. We propose a model to explain these data as well as the observed increased surface roughness in the interfacial removal regions.

  6. Roughness analysis applied to niobium thin films grown on MgO(001) surfaces for superconducting radio frequency cavity applications

    SciTech Connect (OSTI)

    D. B. Beringer, W. M. Roach, C. Clavero, C. E. Reece, R. A. Lukaszew

    2013-02-01T23:59:59.000Z

    This paper describes surface studies to address roughness issues inherent to thin film coatings deposited onto superconducting radio frequency (SRF) cavities. This is particularly relevant for multilayered thin film coatings that are being considered as a possible scheme to overcome technical issues and to surpass the fundamental limit of ?50??MV/m accelerating gradient achievable with bulk niobium. In 2006, a model by Gurevich [ Appl. Phys. Lett. 88 012511 (2006)] was proposed to overcome this limit that involves coating superconducting layers separated by insulating ones onto the inner walls of the cavities. Thus, we have undertaken a systematic effort to understand the dynamic evolution of the Nb surface under specific deposition thin film conditions onto an insulating surface in order to explore the feasibility of the proposed model. We examine and compare the morphology from two distinct Nb/MgO series, each with its own epitaxial registry, at very low growth rates and closely examine the dynamical scaling of the surface features during growth. Further, we apply analysis techniques such as power spectral density to the specific problem of thin film growth and roughness evolution to qualify the set of deposition conditions that lead to successful SRF coatings.

  7. LNG SAFETY RESEARCH: FEM3A MODEL DEVELOPMENT

    SciTech Connect (OSTI)

    Jerry Havens; Iraj A. Salehi

    2005-05-10T23:59:59.000Z

    The objective of this report is to develop the FEM3A model for application to general scenarios involving dispersion problems with obstacles and terrain features of realistic complexity, and for very low wind speed, stable weather conditions as required for LNG vapor dispersion application specified in 49 CFR 193. The dispersion model DEGADIS specified in 49 CFR 193 is limited to application for dispersion over smooth, level terrain free of obstacles (such as buildings, tanks, or dikes). There is a need for a dispersion model that allows consideration of the effects of terrain features and obstacles on the dispersion of LNG vapor clouds. Project milestones are: (1) Simulation of Low-Wind-Speed Stable Atmospheric Milestones Conditions; (2) Verification for Dispersion over Rough Surfaces, With And Without Obstacles; and (3) Adapting the FEM3A Model for General Application. Results for this quarter are work continues to underway to address numerical problems during simulation of low-wind-speed, stable, atmospheric conditions with FEM3A. Steps 1 and 2 in the plan outlined in the first Quarterly report are complete and steps 3 and 4 are in progress. During this quarter, we have been investigating the effect upon numerical stability of the heat transfer model used to predict the surface-to-cloud heat transfer, which can be important for LNG vapor dispersion. Previously, no consideration has been given to ground cooling as a result of heat transfer to the colder gas cloud in FEM3A. The present effort is directed to describing the ground surface temperature decrease as a function of time.

  8. Association of coal metamorphism and hydrothermal mineralization in Rough Creek fault zone and Fluorspar District, Western Kentucky

    SciTech Connect (OSTI)

    Hower, J.C.; Fiene, F.L.; Trinkle, E.J.

    1983-09-01T23:59:59.000Z

    The ambient coal rank (metamorphism) of the Carboniferous coals in the Western Kentucky coalfield ranges from high volatile A bituminous (vitrinite maximum reflectance up to 0.75% R/sub max/) in the Webster syncline (Webster and southern Union Counties) to high volatile C bituminous (0.45 to 0.60% R/sub max/) over most of the remainder of the area. Anomalous patterns of metamorphism, however, have been noted in coals recovered from cores and mines in fault blocks of the Rough Creek fault zone and Fluorspar District. Coals in Gil-30 borehole (Rough Creek faults, Bordley Quadrangle, Union County) vary with no regard for vertical position, from high volatile C(0.55% R/sub max/) to high volatile A (0.89%R/sub max) bituminous. Examination of the upper Sturgis Formation (Missourian/Virgilian) coals revealed that the higher rank (generally above 0.75% R/sub max/) coals had vein mineral assemblages of sphalerite, twinned calcite, and ferroan dolomite. Lower rank coals had only untwinned calcite. Several sites in Webster County contain various coals (Well (No. 8) to Coiltwon (No. 14)) with vitrinite reflectances up to 0.83% R/sub max/ and associated sphalerite mineralization. Mississippian and Lower Pennsylvanian (Caseyville Formation Gentry coal) coals in the mineralized Fluorspar District have ranks to nearly medium volatile bituminous (1.03% R/sub max/). The regional rank trend exhibited by the fualt zones is generally higher rank than the surrounding areas. Sphalerite mineralization in itself is not unique within Illinois basin coals, but if it was partly responsible for the metamorphism of these coals, then the fluid temperature must have been higher within the above mentioned fault complexes.

  9. The determination of the Reynolds shear stress distribution in the transition region resulting from a sudden increase in wall roughness in a two-dimensional channel

    E-Print Network [OSTI]

    Heilhecker, Joe Keith

    1962-01-01T23:59:59.000Z

    THE DETERMINATION OF THE REYNOLDS SHEAR STRESS DISTRIBUTION IN THE TRANSITION REGION RESULTING FROM A SUDDEN INCREASE IN WALL ROUGHNESS IN A TWO-DIMENSIONAL CHANNEL A Thesis By JOE K. HEI LHE CKER Submitted to the Graduate School... REGION RESULTING FROM A SUDDEN INCREASE IN WALL ROUGHNESS IN A TWO-DIMEN4$ONAL CHANNEL A Thesis By JOE K. HEI LHE CKER Approved as to style and content by: (Chairm o C mittee) (Head of Department) May 1962 TAB LE OF CONTE NT S Page List...

  10. Use of field experimental studies to evaluate emergency response models

    SciTech Connect (OSTI)

    Gudiksen, P.H.; Lange, R.; Rodriguez, D.J.; Nasstrom, J.S.

    1985-07-16T23:59:59.000Z

    The three-dimensional diagnostic wind field model (MATHEW) and the particle-in-cell atmospheric transport and diffusion model (ADPIC) are used by the Atmospheric Release Advisory Capability to estimate the environmental consequences of accidental releases of radioactivity into the atmosphere. These models have undergone extensive evaluations against field experiments conducted in a variety of environmental settings ranging from relatively flat to very complex terrain areas. Simulations of tracer experiments conducted in a complex mountain valley setting revealed that 35 to 50% of the comparisons between calculated and measured tracer concentrations were within a factor of 5. This may be compared with a factor of 2 for 50% of the comparisons for relatively flat terrain. This degradation of results in complex terrain is due to a variety of factors such as the limited representativeness of measurements in complex terrain, the limited spatial resolution afforded by the models, and the turbulence parameterization based on sigma/sub theta/ measurements to evaluate the eddy diffusivities. Measurements of sigma/sub theta/ in complex terrain exceed those measured over flat terrain by a factor of 2 to 3 leading to eddy diffusivities that are unrealistically high. The results of model evaluations are very sensitive to the quality and the representativeness of the meteorological data. This is particularly true for measurements near the source. The capability of the models to simulate the dispersion of an instantaneously produced cloud of particulates was illustrated to be generally within a factor of 2 over flat terrain. 19 refs., 16 figs.

  11. Effect of discharge current and deposition temperature on roughness and density of NbC films fabricated by ion beam sputtering technique

    SciTech Connect (OSTI)

    Dhawan, Rajnish, E-mail: rajnish@rrcat.gov.in; Rai, Sanjay, E-mail: rajnish@rrcat.gov.in; Lodha, G. S., E-mail: rajnish@rrcat.gov.in [X-ray optics Section, Indus Synchrotron Utilization Division, Raja Ramanna Center for Advanced Technology, Indore-452013 (India)

    2014-04-24T23:59:59.000Z

    NbC films were prepared using Ion beam sputtering system at various discharges current from 0.4 amps to 1.2 amps at room temperature. Effect of temperature on NbC films were also studied by depositing NbC films at various temperatures from room temperature to 200,300,400 and 600°C. X-ray reflectivity (XRR) study shows that surface roughness of the film decreases with decrease in discharge current. The optimum lowest roughness 3.2Å having density 92% of bulk was achieved at discharge current 0.6 amps at 3.0 cm{sup 3}/min Ar gas flow. X-ray study also shows that film roughness decreases with increase in temperature of the film and after a certain temperature it increases with increase in temperature. The lowest surface roughness 2.1Å was achieved at 300°C with density 83% of bulk NbC at constant discharge current 0.6 amps.

  12. COMPARISON OF SEA SURFACE ROUGHNESS MODELS FOR OFFSHORE WIND POWER UTILISATION Bernhard Lange(1), Jrgen Hjstrup(2), Sren Larsen(2), Rebecca Barthelmie(2)

    E-Print Network [OSTI]

    Heinemann, Detlev

    Large offshore wind farms are being built in several countries in Europe. The economic viabilityCOMPARISON OF SEA SURFACE ROUGHNESS MODELS FOR OFFSHORE WIND POWER UTILISATION Bernhard Lange(1 of such projects depends on the favourable wind conditions of offshore sites, since the higher energy yield has

  13. D etailed m odeling ofreactive flow s th rough geologicm edia is necessary to understand a num ber of environm entalproblem s of national

    E-Print Network [OSTI]

    Mills, Richard

    fluids and geologic seq uestration of CO2 in deep reservoirs. Such problem s generally req uire sim s to th e surface , for e xam ple , th rough abandone d w e lls and fracture s in cap rock s. Accurate

  14. A cost-effective adverse-weather precision guidance system

    SciTech Connect (OSTI)

    Fellerhoff, R.; Burgett, S.

    1995-08-01T23:59:59.000Z

    This SAND report documents the results of an LDRD project undertaken to study the accuracy of terrain-aided navigation coupled with highly accurate topographic maps. A revolutionary new mapping technology, interferometric synthetic aperture radar (IFSAR), has the ability to make terrain maps of extremely high accuracy and spatial resolution, more than an order of magnitude better than currently available DMA map products. Using a laser altimeter and the Sandia Labs Twin Otter Radar Testbed, fix accuracies of less than 3 meters CEP were obtained over urban and natural terrain regions.

  15. Local changes of work function near rough features on Cu surfaces operated under high external electric field

    SciTech Connect (OSTI)

    Djurabekova, Flyura, E-mail: flyura.djurabekova@helsinki.fi; Ruzibaev, Avaz; Parviainen, Stefan [Helsinki Institute of Physics and Department of Physics, University of Helsinki, P.O. Box 43, FI-00014 Helsinki (Finland); Holmström, Eero [Department of Physics, University of Helsinki, P.O. Box 64, FIN-00014 Helsinki (Finland); Department of Earth Sciences, Faculty of Maths and Physical Sciences, UCL Earth Sciences, Gower Street, London WC1E 6BT (United Kingdom); Hakala, Mikko [Department of Physics, University of Helsinki, P.O. Box 64, FIN-00014 Helsinki (Finland)

    2013-12-28T23:59:59.000Z

    Metal surfaces operated under high electric fields produce sparks even if they are held in ultra high vacuum. In spite of extensive research on the topic of vacuum arcs, the mystery of vacuum arc origin still remains unresolved. The indications that the sparking rates depend on the material motivate the research on surface response to extremely high external electric fields. In this work by means of density-functional theory calculations we analyze the redistribution of electron density on (100) Cu surfaces due to self-adatoms and in presence of high electric fields from ?1?V/nm up to ?2?V/nm (?1 to ?2 GV/m, respectively). We also calculate the partial charge induced by the external field on a single adatom and a cluster of two adatoms in order to obtain reliable information on charge redistribution on surface atoms, which can serve as a benchmarking quantity for the assessment of the electric field effects on metal surfaces by means of molecular dynamics simulations. Furthermore, we investigate the modifications of work function around rough surface features, such as step edges and self-adatoms.

  16. Validated heat-transfer and pressure-drop prediction methods based on the discrete-element method: Phase 2, two-dimensional rib roughness

    SciTech Connect (OSTI)

    James, C.A.; Hodge, B.K.; Taylor, R.P. [Mississippi State Univ., MS (United States). Dept. of Mechanical and Nuclear Engineering

    1993-05-01T23:59:59.000Z

    Surface roughness is a commonly used approach for enhancing the rate of heat transfer of surfaces, such as in heat-exchanger tubes. Because the improved thermal performance of roughened surfaces is at the expense of increased flow resistance (increased pressure drop or friction factor), accurate prediction techniques for determining the friction factors and Nusselt numbers for roughened surfaces are required if such features are to be considered as design options. This report presents the results of the second phase of a research program sponsored by Argonne National Laboratory to validate models for the prediction of friction factors and Nusselt numbers for fully developed turbulent flow in enhanced heat-exchanger tubes. The first phase was concerned with validating a roughness model for turbulent flow in tubes internally roughened with three-dimensional distributed roughness elements, such as sandgrains, spheres, hemispheres, and cones. The second phase is concerned with devising and validating methods for the prediction of friction factors and Nusselt numbers for turbulent flow in tubes internally roughened with repeated, two-dimensional ribs aligned perpendicular to the flow. The ribs are spaced sufficiently far apart that the leeward-side separated flow reattaches to the wall before again separating in order to negotiate the next rib. This heat-transfer enhancement mechanism is called the separation and reattachment mechanism, after Rabas (1989). This work is limited to rectangular rib shapes.

  17. Comprehensive magnetotransport characterization of two dimensional electron gas in AlGaN/GaN high electron mobility transistor structures leading to the assessment of interface roughness

    SciTech Connect (OSTI)

    Mishra, Manna Kumari [Solid State Physics Laboratory, Lucknow Road, Timarpur, Delhi-110054 (India); Netaji Subhas Institute of Technology, Dwarka, New Delhi-110078 (India); Sharma, Rajesh K., E-mail: rksharma@sspl.drdo.in; Manchanda, Rachna; Bag, Rajesh K.; Muralidharan, Rangarajan [Solid State Physics Laboratory, Lucknow Road, Timarpur, Delhi-110054 (India); Thakur, Om Prakash [Netaji Subhas Institute of Technology, Dwarka, New Delhi-110078 (India)

    2014-09-15T23:59:59.000Z

    Magnetotransport in two distinct AlGaN/GaN HEMT structures grown by Molecular Beam Epitaxy (MBE) on Fe-doped templates is investigated using Shubnikov de-Haas Oscillations in the temperature range of 1.8–6 K and multicarrier fitting in the temperature range of 1.8–300 K. The temperature dependence of the two dimensional electron gas mobility is extracted from simultaneous multicarrier fitting of transverse and longitudinal resistivity as a function of magnetic field and the data is utilized to estimate contribution of interface roughness to the mobility and the corresponding transport lifetime. The quantum scattering time obtained from the analysis of Shubnikov de Haas Oscillations in transverse magnetoresistance along with the transport lifetime time were used to estimate interface roughness amplitude and lateral correlation length. The results indicate that the insertion of AlN over layer deposited prior to the growth of GaN base layer on Fe doped GaN templates for forming HEMT structures reduced the parallel conduction but resulted in an increase in interface roughness.

  18. SECURITY MODELING FOR MARITIME PORT DEFENSE RESOURCE ALLOCATION

    SciTech Connect (OSTI)

    Harris, S.; Dunn, D.

    2010-09-07T23:59:59.000Z

    Redeployment of existing law enforcement resources and optimal use of geographic terrain are examined for countering the threat of a maritime based small-vessel radiological or nuclear attack. The evaluation was based on modeling conducted by the Savannah River National Laboratory that involved the development of options for defensive resource allocation that can reduce the risk of a maritime based radiological or nuclear threat. A diverse range of potential attack scenarios has been assessed. As a result of identifying vulnerable pathways, effective countermeasures can be deployed using current resources. The modeling involved the use of the Automated Vulnerability Evaluation for Risks of Terrorism (AVERT{reg_sign}) software to conduct computer based simulation modeling. The models provided estimates for the probability of encountering an adversary based on allocated resources including response boats, patrol boats and helicopters over various environmental conditions including day, night, rough seas and various traffic flow rates.

  19. Micro-home ownership in a mega-metropolis

    E-Print Network [OSTI]

    MacCarroll, Christian D. (Christian David)

    2005-01-01T23:59:59.000Z

    As a means to keep pace with today's globally networked society, the home is reconceived as a portable, transformable device that adapts and reconfigures itself to coexist within a range of changing terrains. Ownership ...

  20. Department of Intercollege Programs for Science Education 1 | P a g e This Summer 2013 Bulletin includes

    E-Print Network [OSTI]

    Lawrence, Rick L.

    appropriate for mixed- weather and rugged terrain. Several classes will travel into high altitude back country repellant, rain/wind protective jacket, warm layer of clothing, and solid-shoes or boots. A hand lens

  1. Niwot Ridge CRN Station Up & On-Line.

    E-Print Network [OSTI]

    Niwot Ridge CRN Station Up & On-Line. I made a decision after the Science Panel Review to put tree removal Wind Speed 3, terrain elevation change Solar Radiation 3, solar shading to west #12;

  2. Applied Studies and Technology Stakeholder Outreach: Helping...

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

    along the sand riding all-terrain vehicles, rounding up their horses under a ceramic-blue sky. Across a dune ridge, Quentin Benally wipes his brow, adjusts his camo sun hat, and...

  3. Curl Flame Fractal Rib cage and neck of a Cretaceous plesiosaur (elasmosaur)

    E-Print Network [OSTI]

    Machel, Hans

    Curl Flame Fractal Rib cage and neck of a Cretaceous plesiosaur (elasmosaur) Fretted terrain (unit of Gusev Crater, Mars narrow channels scarp narrow ridge Basin Floor Assemblage Basin oor unit 1--Forms

  4. An Integrated Assessment of the Influences of Upland Thermal-Erosional Features on Landscape Structure and Function in the Foothills of the Brooks Range, Alaska

    E-Print Network [OSTI]

    Crosby, Benjamin T.

    The Rubenstein School of Environment and Natural Resources, University of Vermont, USA B.T. Crosby, K. Krieger in foothill and mountain terrain are less well known than similar dynamics on coastal plains and peat plateaus

  5. airborne lidar mapping: Topics by E-print Network

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

    A minimum height of 1 m was applied to define woody understorey. Critical to this process were a Digital Terrain Model (extracted from the leaf-off last return LiDAR data)...

  6. altitude wind tunnel: Topics by E-print Network

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

    Helens Using NASA SRTM Digital Terrain Model M Alberta, University of 2 Utilization of Wind Energy at High Altitude Physics (arXiv) Summary: Ground based, wind energy extraction...

  7. Between nature and artifice : The Landscape Architecture Research Office (1966-1979)

    E-Print Network [OSTI]

    McMahon, Catherine F. (Catherine Fae)

    2009-01-01T23:59:59.000Z

    Cambridge in the 1960s was a locus of experimentation and research in new computing technologies -from the production of transportation models for New England to the design of war games simulating the vagaries of the terrain ...

  8. Antonio Diaz-Calderon Jet Propulsion Laboratory

    E-Print Network [OSTI]

    Kelly, Alonzo

    @jpl.nasa.gov Alonzo Kelly The Robotics Institute Carnegie Mellon University On-Line Stability Margin and Attitude which move heavy loads, accelerate or brake aggressively, turn at speed, or operate on sloped terrain

  9. Rampart craters on Ganymede: Their implications for fluidized ejecta emplacement Joseph BOYCE1*

    E-Print Network [OSTI]

    Stewart, Sarah T.

    on Ganymede have the overall ejecta morphology similar to Martian double-layer ejecta (DLE and the concentration of Martian DLE craters on the northern lowlands suggests that these terrains may share key

  10. Estimation of ground reaction force and zero moment point on a powered ankle-foot prosthesis

    E-Print Network [OSTI]

    Martinez Villalpando, Ernesto Carlos

    2006-01-01T23:59:59.000Z

    Commercially available ankle-foot prostheses are passive when in contact with the ground surface, and thus, their mechanical properties remain fixed across different terrains and walking speeds. The passive nature of these ...

  11. Discovering Controlling Factors of Geospatial Variables Tomasz Stepinski

    E-Print Network [OSTI]

    Eick, Christoph F.

    as well as a practical point of view, such as the impact of global warming on vegetation cover. Currently describing terrain topography, climate, vegetation cover, lithology, soil properties, human impact, etc

  12. This is an author-formatted version. The original publication is available at www.springerlink.com. ISVC 2011, Part II, LNCS 6939, pp. 45-54.

    E-Print Network [OSTI]

    Borst, Christoph Walter

    tracking precision and display sizes. Fig. 1. Left: Low-cost well log visualization system (Mitsubishi 3D) hanging under- neath a terrain generated from SRTM (Shuttle Radar Topography Mission) data. The iPod Touch

  13. TAHITIAN JEWELS 10-NIGHT LUXURY CRUISE

    E-Print Network [OSTI]

    Raina, Ramesh

    wonderland, and explore the varied terrain of Nuku Hiva, from its black sand beaches to deep bays control supplying any services or providing any goods offered or included. GN and the sponsoring

  14. Safety posters | Argonne National Laboratory

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

    the chance of accidents and hybrid tires keep me ready for any type of terrain - pavement or gravel. I always check for property inflated tires before I hit the road because...

  15. Control of a Powered Ankle–Foot Prosthesis Based on a Neuromuscular Model

    E-Print Network [OSTI]

    Geyer, Hartmut

    Control schemes for powered ankle-foot prostheses rely upon fixed torque-ankle state relationships obtained from measurements of intact humans walking at target speeds and across known terrains. Although effective at their ...

  16. Autonomous underwater vehicle navigation and mapping in dynamic, unstructured environments

    E-Print Network [OSTI]

    Kunz, Clayton Gregory

    2012-01-01T23:59:59.000Z

    This thesis presents a system for automatically building 3-D optical and bathymetric maps of underwater terrain using autonomous robots. The maps that are built improve the state of the art in resolution by an order of ...

  17. Assessing the frictional and baroclinic contributions to stratified wake formation: a parameter space study

    E-Print Network [OSTI]

    Smith, Jamie Brooke

    2006-08-16T23:59:59.000Z

    of the - parameter space, including both unstratified ( = 0) and highly stratified ( = 4) flows and for terrain slopes characteristic of both geophysical ( = 0.1) and laboratory scale ( = 2.0) obstacles. Simulations both with and without applied surface stresses...

  18. The opportunistic green : building on Toronto's utility corridor

    E-Print Network [OSTI]

    Rahimi, Kamyar

    2014-01-01T23:59:59.000Z

    The Green Line or hydro corridors of Toronto are sprawling lengths of continuous, mostly vacant land used for the primary purpose of transmitting electricity. They are unusual terrain, physically sparse but culturally ...

  19. The journey from New Delhi to Islamabad : dependence and subversion in the ambivalent expression of nationhood

    E-Print Network [OSTI]

    Ahmed, Imran

    1992-01-01T23:59:59.000Z

    This thesis addresses the critical terrain on which the colonial and post-colonial narratives of identity take shape. Taking Gayatri Spivak's aphorism that imperialism requires a rereading "not because Empire ..... is ...

  20. Numerical simulation of the 16-19 October 1994 southeast Texas heavy rain event: precipitation results and diagnosis of the lifting mechanism

    E-Print Network [OSTI]

    Petroski, Thomas John

    2000-01-01T23:59:59.000Z

    During the period 16-19 October 1994, a mesoscale convective system (MCS) developed within a weakly forced large-scale environment over relatively flat terrain. This resulted in extreme rainfall totals and subsequent widespread flash flooding...

  1. E N G I N E E R I N G T H E F U T U R E O F R O B O T I C S Highly mobile &

    E-Print Network [OSTI]

    Gupta, Abhinav

    , reconnaissance, surveillance, and work in hazardous environments A removable battery pack is the only component-wheeled Mini Crusher easily tackles gravel and other challenging terrain and literally turns on a dime. #12;

  2. Stochastic approaches to mobility prediction, path planning and motion control for ground vehicles in uncertain environments

    E-Print Network [OSTI]

    Kewlani, Gaurav

    2009-01-01T23:59:59.000Z

    The ability of autonomous or semi-autonomous unmanned ground vehicles (UGVs) to rapidly and accurately predict terrain negotiability, generate efficient paths online and have effective motion control is a critical requirement ...

  3. ATV Safety 

    E-Print Network [OSTI]

    Smith, David

    2004-09-16T23:59:59.000Z

    All-terrain vehicles are very popular for off-road recreation. However, the number of injuries and deaths from ATV accidents is growing rapidly. This publication lists the causes of injuries and fatalities, discusses Texas ATV laws, and provides...

  4. 758-60 751-54 TAKU SHUTTLE

    E-Print Network [OSTI]

    Ickert-Bond, Steffi

    Beluga Field Ice Rink Townshend Point THOMPSON DRIVE TROTH YEDDHA' PARK HULBERT NANOOK TERRAIN PARK Nerland McIntosh Stevens Ice Arena Lola Tilly Student Recreation Center WestRidge Research Wickersham

  5. Landscapes as references for design

    E-Print Network [OSTI]

    Batchelor, James P

    1981-01-01T23:59:59.000Z

    This is a study of the ways in which the forms in landscapes - natural terrain adapted and inhabited - can serve as references in architectural design. As references for design, landscapes provide a richness of responses ...

  6. How to Include Zebras in the

    E-Print Network [OSTI]

    Singh, Jaswinder Pal

    Cellular... So far in class, you've talked a lot about cellular service: ­ Cellular towers receive voice antennas available ­ Looking at 802.11 or VHF transmission Difficult terrain Power generation & storage

  7. be virtually impossible to construct land lines and microwave networks in the

    E-Print Network [OSTI]

    Brewer, Eric A.

    ) with a microwave radio transmission tail is not suit- able for very harsh terrain, or for locations that are more. The use of microwave repeater towers, requiring line- of-sight from one tower to the next, was ruled out

  8. Axel

    E-Print Network [OSTI]

    Abad-Manterola, Pablo

    Recent scientific findings suggest that some of the most interesting sites for future exploration of planetary surfaces lie in terrains that are currently inaccessible to conventional robotic rovers. To provide robust and ...

  9. Tradespace model for planetary surface exploration hopping vehicles

    E-Print Network [OSTI]

    Cunio, Phillip M

    2012-01-01T23:59:59.000Z

    Robotic planetary surface exploration, which has greatly benefited humankind's scientific knowledge of the solar system, has to date been conducted by sedentary landers or by slow, terrain-limited rovers. However, there ...

  10. What can I do with this degree? AREAS EMPLOYERS

    E-Print Network [OSTI]

    Escher, Christine

    Planning Environmental Impact Terrain and Land Use PHYSICAL/ENVIRONMENTAL Federal government Publishers or companies in insurance, environmental work, transportation, communications and international trade language, history, customs, and culture. #12;(Geography, Page 2) STRATEGIESEMPLOYERS CARTOGRAPHY Mosaics

  11. Development of an Independent Hip Drive for a 2D Biped Walking Machine

    E-Print Network [OSTI]

    Rooney, Craig

    2012-08-31T23:59:59.000Z

    and Automation Laboratory (ISAL) at the University of Kansas has developed a two dimensional (2D) biped walker, nicknamed the Jaywalker, in order to study the requirements necessary for a bipedal robot to traverse uneven terrain and successfully regain stability...

  12. A parametric analysis of the start-up procedure and flight characteristics of a gliding autogyro

    E-Print Network [OSTI]

    Oliver, Michael, 1981-

    2005-01-01T23:59:59.000Z

    Currently, Draper Laboratory is in the development stages of a gliding autogyro airdrop system. The goal of the project is to design a platform capable of placing small, high value items into urban terrain. Theoretically, ...

  13. Project EARTH-12-PPS1: Weathering Rates in the Critical Zone: Soil Erosion, River Chemistry and Climate

    E-Print Network [OSTI]

    Henderson, Gideon

    Project EARTH-12-PPS1: Weathering Rates in the Critical Zone: Soil Erosion, River Chemistry., Assessing the role of climate on uranium and lithium isotope behaviour in rivers draining a basaltic terrain

  14. Urban Reclamation in São Paulo

    E-Print Network [OSTI]

    Eskinazi, Victor

    2009-01-01T23:59:59.000Z

    The urbanized terrain of São Paulo is characterized by wasteful landscapes on peripheral areas of the metropolitan agglomeration, and decaying landscapes of waste in the core of the city. If on the one hand, the increasingly ...

  15. J Glob Optim DOI 10.1007/s10898-007-9206-5

    E-Print Network [OSTI]

    Lucia, Angelo

    conformations of united atom n-alkane models for diesel, home heating, and residual fuel oils. The terrain of petroleum or hydrocarbon fuels such as home heating and diesel fuels is a nag- ging and costly problem

  16. ~mcupkric EnviroMvnr Vol. IS. No. IO, pp. 1969-2002. 1984 Pnnted in Great Britain.

    E-Print Network [OSTI]

    Hunt, Julian

    ~mcupkric EnviroMvnr Vol. IS. No. IO, pp. 1969-2002. 1984 Pnnted in Great Britain. ocKJ4-6981/84 13 diffusion, stratified flow, wind tunnel, towing tank, complex terrain, air pollution. NOMENCLATURE constant

  17. ATV Safety

    E-Print Network [OSTI]

    Smith, David

    2004-09-16T23:59:59.000Z

    All-terrain vehicles are very popular for off-road recreation. However, the number of injuries and deaths from ATV accidents is growing rapidly. This publication lists the causes of injuries and fatalities, discusses Texas ATV laws, and provides...

  18. Alternative Fuels Data Center

    Alternative Fuels and Advanced Vehicles Data Center [Office of Energy Efficiency and Renewable Energy (EERE)]

    Low-Speed Vehicle Access to Roadways A low-speed vehicle is defined as a four-wheeled motor vehicle, other than an all-terrain vehicle, that is capable of reaching speeds of at...

  19. Simulated Interdiction: Proliferation Security Initiative 

    E-Print Network [OSTI]

    Gassam, Geraldine; Jacob, Savio; Jenecka, Bobby; Lanzing, Kevin; Lee, Jeonghoon; Reves, Nick; Slanker, Julie; Trojan, Anthony; Wismer, Ryan

    2009-01-01T23:59:59.000Z

    of the European Union. Terrain: Vast central plains, mountains in West, hills and low mountains in east; rugged mountains and broad river valleys in Alaska, rugged volcanic topography in Hawaii. Border Length: Canada 8,893 kilometers, Mexico 3,141 kilometers... Area: approximately 17 million square kilometers. Terrain: broad plains with low hills west of primary mountain range; vast coniferous forest and tundra in central northern territory; uplands and mountains along southern border regions Border Length...

  20. Perceptions of Security

    E-Print Network [OSTI]

    Ura, Karma

    2001-01-01T23:59:59.000Z

    followed by guerrillas, waged by the Bhutanese militia in rugged terrain. Though not written in accounts of any battles, the form of war oral sources describe suggest unconventional warfare. The natural defence position of the terrain combined with its... nor poverty in the areas adjacent to Bhutan, which are the ultimate causes of the current security problems Bhutan faces, are unfortunately on decline. Journal of Bhutan Studies 136 On the other hand, Bhutan, like several small states, has been...

  1. Side slope design based on human tolerance to vehicle response

    E-Print Network [OSTI]

    Weaver, Graeme Douglas

    1970-01-01T23:59:59.000Z

    an investigation of simulated vehicle response to the traversal of roadside terrain features. A Texas Transportation Institute adaptation of the CALSVA model was utilized to quantify the relative lateral, longitudinal, and vertical acceleration levels generated... by traversal of roadside cross-sections commonly employed in highway design. STUDY -SOCEDURS The principal aim of this research was to investigate the vehicle dynamic response during traversal of various roadside terrain featuzes to provide a basis...

  2. COMIT FRANAIS D'HISTOIRE DE LA GOLOGIE -Troisime srie -

    E-Print Network [OSTI]

    Boyer, Edmond

    (COFRHIGEO) (séance du 25 novembre 1992) Un géologue d'avant-garde. Il n'est que temps de rendre pleinement leur piémont, il y distingue sur des bases rationnelles dans le sous-sol, quatre "ordres" de terrains monti terziari (correspondant à des collines) ; et les terrains du "quatrième ordre" (il quatro ordine

  3. Obstacle detection for autonomous navigation : an LDRD final report.

    SciTech Connect (OSTI)

    Padilla, Denise D.

    2004-03-01T23:59:59.000Z

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

  4. IMPACT OF DIELECTRIC PARAMETERS ON THE REFLECTIVITY OF 3C-SiC WAFERS WITH A ROUGH SURFACE MORPHOLOGY IN THE RESTSTRAHLEN REGION

    SciTech Connect (OSTI)

    J.A.A. Engelbrecht; E. Janzén; A. Henry; I.J. van Rooyen

    2014-04-01T23:59:59.000Z

    A layer-on-substrate model is used to obtain the infrared reflectance for 3C-SiC with a rough surface morphology. The effect of varying dielectric parameters of the “damaged layer” on the observed reflectivity of the 3C-SiC in the reststrahlen region is assessed. Different simulated reflectance spectra are obtained to those if the dielectric parameters of the “substrate” were varied. Most notable changes in the shape of the simulated reststrahlen peak are observed for changes in the high frequency dielectric constant, the phonon damping constant, the phonon frequencies and “thickness” of damaged surface layer.

  5. The determination of the turbulent intensities in a transitional flow from a smooth to a rough wall with zero pressure gradient in a two-dimensional channel

    E-Print Network [OSTI]

    Islam, Obaidul

    1963-01-01T23:59:59.000Z

    THE DETERMINATION OF THE TURBULENT INTENSITIES IN A TRANSITIONAL FLOW FROM A SMOOTH TO A ROUGH WALL WITH ZERO PRESSURE GRADIENT IN A TWO-DIMENSIONAL CHANNEL A Thesis By Ol3AIDU I. ISLAM Submitted to the Graduate School of. tire Agricultural... WALL WITH ZERO PRESSURE GRADIENT IN A TWO DIMENSIONAL. GHANNEL A Thesis By OBAIDUL ISLAM Approved as to style and content by: F / F Ghairma p'f mm tg Head of Department May 1963 ACKNOWLEDGMENTS Grateful acknowledgment is made to the Texas...

  6. Impact of surface roughness on the electrical parameters of industrial high efficiency NaOH-NaOCl textured multicrystalline silicon solar cell

    SciTech Connect (OSTI)

    Basu, P.K. [Department of Physics, Echelon Institute of Technology, Faridabad 121002, Haryana (India); Pujahari, R.M. [Department of Physics, Echelon Institute of Technology, Faridabad 121002, Haryana (India); Department of Physics, Manav Rachna International University, Faridabad 121001, Haryana (India); Kaur, Harpreet [Department of Physics, Manav Rachna International University, Faridabad 121001, Haryana (India); Department of Physics, Advanced Institute of Technology and Management, Palwal 121105, Haryana (India); Singh, Devi [Department of Physics, Manav Rachna International University, Faridabad 121001, Haryana (India); Varandani, D.; Mehta, B.R. [Department of Physics, Indian Institute of Technology, New Delhi 110016 (India)

    2010-09-15T23:59:59.000Z

    Sodium hydroxide (NaOH) and sodium hypochlorite (NaOCl) solution (1:1 ratio by volume) based texturization process at 80-82 C is an easy, low cost and comparatively new and convenient option for fabrication of any multicrystalline silicon (mC-Si) solar cell. In the present study atomic force microscope is used to observe the intragrain surface in a miniscule area (3 {mu}m x 3 {mu}m) of NaOH-NaOCl textured surface by two and three dimensional analysis, roughness analysis and section analysis. The r.m.s value of the surface parameter of 7.0 nm ascertains the smoothness of the textured surface and further the surface reflectivity is minimized to 4-6% in the 500-1000 nm wavelength range by a proper silicon nitride anti-reflection coating. Comparing with the standard HF-HNO{sub 3}-CH{sub 3}COOH acid textured cell, the NaOH-NaOCl textured cell shows a comparatively lower value of series resistance of 7.17 m{omega}, higher value of shunt resistance of 18.4 {omega} to yield a fill factor of 0.766 leading to more than 15% cell efficiency in the industrial cell processing line. This AFM study yields different surface roughness parameters for the NaOH-NaOCl textured wafers which can be used as a reference standard for optimized texturing. (author)

  7. Surface figure and roughness tolerances for NIF optics and the interpretation of the gradient, P-V wavefront and RMS specifications

    SciTech Connect (OSTI)

    Aikens, D M; English, R E; House, W; Lawson, J K; Nichols, M A; Whistler, W T

    1999-07-01T23:59:59.000Z

    In a high energy laser system such as the National Ignition Facility (NIF), the ability to focus light into as small a spot as possible at the highest possible fluence is highly dependent on the quality of the optics used in the system. Typically, surface form errors and transmitted and reflected wavefront errors are specified in terms of a peak-to-valley wavefront error (P-V), or occasionally in terms of an RMS wavefront error (RMS) 1 . It has been shown, however, that the parameter that most closely correlates with beam focusability is neither of these, but the RMS of the gradients of the wavefront error (RMS Gradient). Further, the spatial frequency of the wavefront error plays a significant role in the way that a given error effects the performance of the laser system, so careful attention must be paid to how the spatial filtering is both specified and accomplished. Since ISO 10110 has no specific provisions for a gradient specification, LLNL has developed its own notation and procedures for these critical specifications. In evaluating surface figure errors as specified by the NIF drawings, modern phase modulating interferometers (PMI) will be used. In addition to performing QA testing of the optics, LLNL intends to utilize the software capabilities of the instruments to obtain the information to model the wavefront of the 131 passes through various optical elements comprising the NIF front end. Tests will be performed and documented after coating and as installed in the specified mechanical mounts. This paper describes the evaluation of the wavefront error for NIF small optics including specifications over a given spatial period callout, the proper low pass filtering of the data and the allowable filtering and settings that can be applied to obtain proper wavefront data. This paper also describes the origin and evolution of other NIF wavefront and roughness specifications, and gives examples. Since the wavefront requirements and hence the specifications vary for the different systems in the NIF, we will focus on one system, the injection laser system (ILS) or ''front end''. Also discussed will be the metrology and data manipulation requirements for the large aperture optics. Finally, clarification will be given to the differences between various versions of the RMS wavefront and roughness specifications allowed in ISO 10110, and how they contrast to the RMS roughness specifications used in ANSI-Y14.5.

  8. Geometric frequency shift for electric dipole searches with trapped spin-1/2 particles in general fields and measurement cells of arbitrary shape with smooth or rough walls

    E-Print Network [OSTI]

    Steyerl, A; Müller, G; Golub, R

    2015-01-01T23:59:59.000Z

    The important role of geometric phases in searches for a permanent electric dipole moment of the neutron, using Ramsey separated oscillatory field nuclear magnetic resonance, was first investigated by Pendlebury $\\textit{et al.}$ [Phys. Rev. A $\\mathbf{70}$, 032102 (2004)]. Their analysis was based on the Bloch equations. In subsequent work using the spin density matrix Lamoreaux and Golub [Phys. Rev. A $\\mathbf{71}$, 032104 (2005)] showed the usual relation between the frequency shifts and the correlation functions of the fields seen by trapped particles in general fields (Redfield theory). More recently we presented a solution of the Schr\\"odinger equation for spin-$1/2$ particles in circular cylindrical traps with smooth walls and exposed to arbitrary fields [Steyerl $\\textit{et al.}$, Phys.Rev. A $\\mathbf{89}$, 052129 (2014)]. Here we extend this work to show how the Redfield theory follows directly from the Schr\\"odinger equation solution and include wall roughness, cylindrical trap geometry with arbitra...

  9. A study of the turbulent intensities and correlation coefficients in the incompressible flow of air in transition from a smooth to a rough wall in a two-dimensional channel

    E-Print Network [OSTI]

    Carper, Herbert Jackson

    1962-01-01T23:59:59.000Z

    A STUDY OF THE TURBULENT INTENSITIES AND CORRELATION COEFFICIENTS IN THE INCOMPRESSIBLE FLOW OF AIR IN TRANSITION FROM A SMOOTH TO A ROUGH WALL IN A TWO-DIMENSIONAL CHANNEL A Thesis By HERBERT JACKSON CARPER JR. Submitted to the Graduate... COEFFICIENTS IN THE INCOMPRESSIBLE FLOW OF AIR IN TRANSITION FROM A SMOOTH TO A ROUGH WALL IN A TWO-DIMENSIONAL CHANNEL A Thesis By HERBERT JACKSON CARPER JR. Approved as to style and content by: (Chairm of o e) (Head of Department) August 1962 853958...

  10. Development of Autonomous Magnetometer Rotorcraft For Wide Area Assessment

    SciTech Connect (OSTI)

    Mark D. McKay; Matthew O. Anderson

    2011-08-01T23:59:59.000Z

    Large areas across the United States and internationally are potentially contaminated with unexploded ordinance (UXO), with some ranges encompassing tens to hundreds of thousands of acres. Technologies are needed which will allow for cost effective wide area scanning with (1) near 100% coverage and (2) near 100% detection of subsurface ordnance or features indicative of subsurface ordnance. The current approach to wide area assessment is a multi-level one, in which medium - altitude fixed wing optical imaging is used for an initial site assessment. This assessment is followed with low altitude manned helicopter based magnetometry. Subsequent to this wide area assessment targeted surface investigations are performed using either towed geophysical sensor arrays or man portable sensors. In order to be an effective tool for small UXO detection, the sensing altitude for magnetic site investigations needs to be on the order of 1 to 3 meters. These altitude requirements mean that manned helicopter surveys will generally only be feasible in large, open and relatively flat terrains. While such surveys are effective in mapping large areas relatively fast there are substantial mobilization/demobilization, staffing and equipment costs associated with these surveys, resulting in costs of approximately $100-$150/acre. In addition, due to the low altitude there are substantial risks to pilots and equipment. Surface towed arrays provide highresolution maps but have other limitations, e.g. in their ability to navigate rough terrain effectively. Thus there is a need for other systems, which can be used for effective data collection. An Unmanned Aerial Vehicle (UAV) magnetometer platform is an obvious alternative. The motivation behind such a system is that it reduces risk to operators, is lower in initial and Operational and Maintenance (O&M) costs (and can thus potentially be applied to smaller sites) and has the potential of being more effective in terms of detection and possibly characterization (through the use of dynamic acquisition, i.e. survey mission in-flight reprioritization).

  11. 27th European Photovoltaic Solar Energy Conference, Frankfurt, Germany, 24-28 September 2012, 2AO.1.5 IMPACT OF THE REAR SURFACE ROUGHNESS ON INDUSTRIAL-TYPE PERC SOLAR CELLS

    E-Print Network [OSTI]

    -generation industrial solar cells as stated in the International Technology Roadmap [3]. An industrial PERC process flow27th European Photovoltaic Solar Energy Conference, Frankfurt, Germany, 24-28 September 2012, 2AO.1.5 IMPACT OF THE REAR SURFACE ROUGHNESS ON INDUSTRIAL-TYPE PERC SOLAR CELLS C.Kranz1 , S. Wyczanowski1 , S

  12. Roughly 15,000 patents a month are issued by the US Patent and Trademark Office (PTO).1 By law, these are supposed to cover only "novel" and "nonobvious" inventions, but an average

    E-Print Network [OSTI]

    Sadoulet, Elisabeth

    1347 Roughly 15,000 patents a month are issued by the US Patent and Trademark Office (PTO).1 By law­20 hours of patent examiner time,2 and a substantial proportion of the few patents later fully evaluated the issuance of many ques- tionable patents. Responding to such concerns, the Supreme Court recently made

  13. Geometric frequency shift for electric dipole searches with trapped spin-1/2 particles in general fields and measurement cells of arbitrary shape with smooth or rough walls

    E-Print Network [OSTI]

    A. Steyerl; C. Kaufman; G. Müller; R. Golub

    2015-05-13T23:59:59.000Z

    The important role of geometric phases in searches for a permanent electric dipole moment of the neutron, using Ramsey separated oscillatory field nuclear magnetic resonance, was first investigated by Pendlebury $\\textit{et al.}$ [Phys. Rev. A $\\mathbf{70}$, 032102 (2004)]. Their analysis was based on the Bloch equations. In subsequent work using the spin density matrix Lamoreaux and Golub [Phys. Rev. A $\\mathbf{71}$, 032104 (2005)] showed the usual relation between the frequency shifts and the correlation functions of the fields seen by trapped particles in general fields (Redfield theory). More recently we presented a solution of the Schr\\"odinger equation for spin-$1/2$ particles in circular cylindrical traps with smooth walls and exposed to arbitrary fields [Steyerl $\\textit{et al.}$, Phys.Rev. A $\\mathbf{89}$, 052129 (2014)]. Here we extend this work to show how the Redfield theory follows directly from the Schr\\"odinger equation solution and include wall roughness, cylindrical trap geometry with arbitrary cross section, and field perturbations that do not, in the frame of the moving particles, average to zero in time and which, therefore, do not satisfy the prerequisites of the statistical approach based on the spin-density matrix. We show by direct, detailed, calculation the agreement of the results from the Schr\\"odinger equation with the Redfield theory for the cases of a rectangular cell with specular walls and of a circular cell with diffuse reflecting walls.

  14. A Unifying Framework to Quantify the Effects of Substrate Interactions, Stiffness, and Roughness on the Dynamics of Thin Supported Polymer Films

    E-Print Network [OSTI]

    Paul Z. Hanakata; Beatriz A. Pazmiño Betancourt; Jack F. Douglas; Francis W. Starr

    2015-02-10T23:59:59.000Z

    Changes in the dynamics of supported polymer films in comparison to bulk materials involve a complex convolution of effects, such as substrate interactions, roughness and compliance, in addition to film thickness. We consider molecular dynamics simulations of substrate-supported, coarse-grained polymer films where these parameters are tuned separately to determine how each of these variables influence the molecular dynamics of thin polymer films. We find that all these variables significantly influence the film dynamics, leading to a seemingly intractable degree of complexity in describing these changes. However, by considering how these constraining variables influence string-like collective motion within the film, we show that all our observations can be understood in a unified and quantitative way. More specifically, the string model for glass-forming liquids implies that the changes in the structural relaxation of these films are governed by the changes in the average length of string-like cooperative motions and this model is confirmed under all conditions considered in our simulations. Ultimately, these changes are parameterized in terms of just the activation enthalpy and entropy for molecular organization, which have predictable dependences on substrate properties and film thickness, offering a promising approach for the rational design of film properties.

  15. Temperature-dependent tensile strength, surface roughness diagnostics, and magnetic support and positioning of polymer ICF shells. Final report, October 1, 1993--April 30, 1995

    SciTech Connect (OSTI)

    Honig, A.

    1995-12-15T23:59:59.000Z

    During the course of this grant, we perfected emissivity and accommodation coefficient measurements on polymer ICF shells in the temperature range 250 to 350 K. Values for polystyrene shells are generally between 10{sup -2} and 10{sup -3}, which are very advantageous for ICF at cryogenic temperatures. Preliminary results on Br doped target shells indicate an accommodation coefficient, presumably associated with surface roughness on an atomic scale, about an order of magnitude larger than for ordinary polystyrene target shells. We also constructed apparatus with optical access for low temperature tensile strength and emissivity measurements, and made preliminary tests on this system. Magnetic shells were obtained both from GDP coating and from doping styrene with 10 manometer size ferromagnetic particles. The magnetic properties were measured through electron spin resonance (ESR). These experiments confirm the applicability of the Curie law, and establish the validity of using ESR measurements to determine shell temperature in the low temperature regime from 4K to 250K, thus complementing our presently accessible range. The high electron spin densities (> 10{sup 20}/CM{sup 3}) suggest magnetic levitation should be feasible at cryogenic temperatures. This work has resulted in two conference presentations, a Technical Report, a paper to be published in Fusion Technology, and a Master`s Thesis.

  16. Rough Paths Theory Fabrice Baudoin

    E-Print Network [OSTI]

    2013-04-09T23:59:59.000Z

    Let p > 2. If xn : [0,1] ? Rd is a sequence of bounded variation paths ... The fundamental theorem of Lyons is the following: ... Brownian motion (B(t))t?0.

  17. Fundamental Mechanisms of Interface Roughness

    SciTech Connect (OSTI)

    Randall L. Headrick

    2009-01-06T23:59:59.000Z

    Publication quality results were obtained for several experiments and materials systems including: (i) Patterning and smoothening of sapphire surfaces by energetic Ar+ ions. Grazing Incidence Small Angle X-ray Scattering (GISAXS) experiments were performed in the system at the National Synchrotron Light Source (NSLS) X21 beamline. Ar+ ions in the energy range from 300 eV to 1000 eV were used to produce ripples on the surfaces of single-crystal sapphire. It was found that the ripple wavelength varies strongly with the angle of incidence of the ions, which increase significantly as the angle from normal is varied from 55° to 35°. A smooth region was found for ion incidence less than 35° away from normal incidence. In this region a strong smoothening mechanism with strength proportional to the second derivative of the height of the surface was found to be responsible for the effect. The discovery of this phase transition between stable and unstable regimes as the angle of incidence is varied has also stimulated new work by other groups in the field. (ii) Growth of Ge quantum dots on Si(100) and (111). We discovered the formation of quantum wires on 4° misoriented Si(111) using real-time GISAXS during the deposition of Ge. The results represent the first time-resolved GISAXS study of Ge quantum dot formation. (iii) Sputter deposition of amorphous thin films and multilayers composed of WSi2 and Si. Our in-situ GISAXS experiments reveal fundamental roughening and smoothing phenomena on surfaces during film deposition. The main results of this work is that the WSi2 layers actually become smoother during deposition due to the smoothening effect of energetic particles in the sputter deposition process.

  18. Pavement roughness on expansive clays

    E-Print Network [OSTI]

    Velasco, Manuel O

    1980-01-01T23:59:59.000Z

    0 I/I Ql 0 Z 0 V- IU 0 Soil samples were taken adjacent to the roadway segments using a manual auger, in general at depths of 1, 2, and 3 feet. A total of 60 samples were brought to the laboratory, where the following tests have been...

  19. Weather pattern climatology of the Great Plains and the related wind regime

    SciTech Connect (OSTI)

    Barchet, W.R.

    1982-11-01T23:59:59.000Z

    The meteorology of the Great Plains can be described as a constant progression of air masses, fronts and cyclonic storm systems. Each of these meteorological conditions can be characterized by identifiable isobaric and related weather parameter patterns. Nine such patterns have been defined to type the weather patterns in the Great Plains. Time series of weather pattern types were produced for 62 stations on the Great Plains. Statistical analyses of these time series produced annual and seasonal frequencies of occurrence of the weather pattern types. Maps of the annual and seasonal frequency of occurrence of weather pattern type are presented for the Great Plains. Persistence and alternation frequencies match what is expected for traveling temperate latitude cyclones, anticyclones and fronts. The wind regime for stations at which the anemometer height and location was constant (and known) for a minimum of three consecutive years was stratified by weather pattern type. Statistical analyses were made to show the response of the wind to the large-scale distribution of air pressure associated with a weather pattern type. The response of the wind to the weather pattern is a site-specific result of the interaction of the large-scale meteorology with local terrain, surface roughness and atmospheric stability. Mean wind speed discriminates between pairs of weather pattern types with better than 75% confidence for more than two-thirds of the possible pairs of weather pattern types.

  20. THE MARS HOPPER: AN IMPULSE DRIVEN, LONG RANGE, LONG-LIVED MOBILE PLATFORM UTILIZING IN-SITU MARTIAN RESOURCES

    SciTech Connect (OSTI)

    Robert C. O'Brien; Mark McKay; Brian Gross; JOnathan Webb

    2001-09-01T23:59:59.000Z

    The requirements for performance by planetary exploration missions are increasing. Landing at a single location to take data is no longer sufficient. Due to the increasing cost, the missions that provide mobile platforms that can acquire data at displaced locations are becoming more attractive. Landers have also had limited range due to power limitations, limited lifetime of subsystems and the inability to negotiate rough terrain. The Center for Space Nuclear Research has designed an instrumented platform that can acquire detailed data at hundreds of locations during its lifetime - a Mars Hopper. The Mars Hopper concept utilizes energy from radioisotopic decay in a manner different from any existing radioisotopic power sources—as a thermal capacitor. By accumulating the heat from radioisotopic decay for long periods, the power of the source can be dramatically increased for short periods. Thus, a radioisotopic thermal rocket (RTR) is possible. The platform will be able to “hop” from one location to the next every 5-7 days with a separation of 5-10 km per hop. Each platform will weigh around 50 kgs unfueled which is the condition at deployment. Consequently, several platforms may be deployed on a single launch from Earth. With a lifetime estimated at 5-7 years, the entire surface of Mars can be mapped in detail by a couple dozen platforms. In addition, Hoppers can collect samples and deliver them to the Mars Science Laboratory for more detailed analysis. The design and performance of the Mars Hopper will be discussed.

  1. Department of Mechanical and Nuclear Engineering Spring 2009 Dynamic Loading Analysis and Redesign for the

    E-Print Network [OSTI]

    Demirel, Melik C.

    effectively on smooth terrain, these machines lose their effectiveness when operating in environments and Redesign for the Hip Joint of the Bipedal Machine Overview Current construction machines available of the construction industry · Researched Biomechanics data to determine joint reaction forces in humans while walking

  2. ORIGINAL PAPER Equation of state and pressure-induced structural changes

    E-Print Network [OSTI]

    Vocadlo, Lidunka

    ), with dislocations in thrust terrains, as a component of cold desert salt deposits (Keys and Williams 1981 igneous rocks (Hardie 1991). Commercially, mirabilite has been acknowledged as a possible thermal storage a significant problem for the construction industry by virtue of its role in the weathering Electronic

  3. Approved for Public Release; Distribution Unlimited 1 Virtual Robotics Challenge

    E-Print Network [OSTI]

    2/6/2013 E. Krotkov Introduction Qual-3 SDF world files govern Downslope in radians, not #12 terrain and objects that constitute the environment) will be available as SDF world files as soon in the SDF world files and in this document, the dimensions in the SDF world files shall govern. Similarly

  4. The two most common complaints the public has about animal feeding operations (AFOs) are

    E-Print Network [OSTI]

    Mukhtar, Saqib

    factors to con- sider are set-back distances, wind and topography. An AFO should have a set-back distance abruptly and frequently. Also, while rare, air carrying odors may drain from a hilltop to lower terrain angles when the wind is blowing and by the set-back distance. As Figure 1 shows, the potential for wind

  5. www.wasp.dk Long-term (1-20 years) prediction of wind

    E-Print Network [OSTI]

    ;4 www.wasp.dk European Wind Atlas www.wasp.dk Geostrophic winds #12;5 www.wasp.dk Thermal winds www.wasp.dk Background · European Wind Atlas, Vol. II: Measurements and Modelling in Complex Terrain. Multi-partner EU). Exploring the limits of WAsP: the Wind Atlas Analysis and Application Program. Proc. 1996 European Union

  6. Rappropriation des donnes et droit la rediffusion La rutilisation des donnes en dehors de la plateforme Facebook a t beaucoup discute selon l'angle de la

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    plateforme Facebook a été beaucoup discutée selon l'angle de la vie privée et de la nécessité d données des utilisateurs à des entreprises, la licence octroyée à Facebook étant transférable. A force d'abus répétés sur le terrain de la vie privée, le débat à propos de Facebook ignore largement la question de l

  7. Photogrammetric Image Registration (PIR) of MTI Imagery P. Pope and J. Theiler*

    E-Print Network [OSTI]

    Theiler, James

    Photogrammetric Image Registration (PIR) of MTI Imagery P. Pope and J. Theiler* Space and Remote Imager (MTI) satellite. The photogrammetric image registration (PIR) method consists of two main parts. The PIR method uses mathematical models of the sensor, its trajectory, timing, and the terrain to mimic

  8. This Summer 2011 Bulletin includes: 1) Summer 2011 Course Information

    E-Print Network [OSTI]

    Dyer, Bill

    will need clothing and footwear appropriate for mixed-weather and rugged terrain. Several classes will travel into high altitude back country areas where dressing in layers for changing weather conditions, sunscreen, sunglasses, insect repellant, rain/wind protective jacket, warm layer of clothing, and solid

  9. IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, TO APPEAR. 1 A Hybrid Conditional Random Field for

    E-Print Network [OSTI]

    Murphy, Kevin Patrick

    IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, TO APPEAR. 1 A Hybrid Conditional Random Field of buildings, vegetations, cars, and natural terrain features over large regions. However, in many applications generative) probabilistic model, we call it a hybrid Conditional Random Field. We show that a MAP estimate

  10. (1) Determine how topography is related to the spatial distribution

    E-Print Network [OSTI]

    and cool dry summers. Dominant tree species include Douglas-fir (Pseudotsuga menziesii), western hemlock and 3). Terrain is rugged and steep, with a dense network of streams and a climate with warm wet winters-fire salvage b. Stand Basal Area vs Dead Wood Volume 0 20 40 60 80 100 120 0 200 400 600 800 1000 1200 Volume

  11. Conepatus leuconotus (Carnivora: Mephitidae) JERRY W. DRAGOO AND STEVEN R. SHEFFIELD

    E-Print Network [OSTI]

    Hayssen, Virginia

    white stripe along the back, and is 1 of 4 species in the genus Conepatus. It has been reported as far reported in a variety of habitats from canyons, stream sides, rocky terrain, various grasslands, tropical, not Viverra Linnaeus, 1758. Mustela: Daudin in Lace´pe`de, 1802:163. Not Mustela Linnaeus, 1758. Gulo

  12. Wind Energy-Related Atmospheric Boundary Layer Large-Eddy Simulation Using OpenFOAM: Preprint

    SciTech Connect (OSTI)

    Churchfield, M.J.; Vijayakumar, G.; Brasseur, J.G.; Moriarty, P.J.

    2010-08-01T23:59:59.000Z

    This paper develops and evaluates the performance of a large-eddy simulation (LES) solver in computing the atmospheric boundary layer (ABL) over flat terrain under a variety of stability conditions, ranging from shear driven (neutral stratification) to moderately convective (unstable stratification).

  13. Session: Wind resources and site characterisation 1 (BT1.3) Track: Technical

    E-Print Network [OSTI]

    . The validation is based on meteorological and wind farm production data from about 10 wind farms, situated) application of the results for improved wind farm power production predictions as well as wind resource on meteorological and wind turbine data from about 10 wind farms in complex terrain. The wind farm sites are located

  14. Hierarchical occlusion culling for arbitrarily-meshed height fields 

    E-Print Network [OSTI]

    Edmondson, Paul Michael

    2004-09-30T23:59:59.000Z

    Many graphics applications today have need for high-speed 3-D visualization of height fields. Most of these applications deal with the display of digital terrain models characterized by a simple, but vast, non-overlapping mesh of triangles. A great...

  15. I/O-Efficient Algorithms for Contour Line Extraction and Planar Graph Blocking

    E-Print Network [OSTI]

    Agarwal, Pankaj K.; Arge, Lars; Murali, T. M.; Kasturi R., Varadarajan; Vitter, Jeffrey Scott

    1998-01-01T23:59:59.000Z

    For a polyhedral terrain C, the contour at z-coordinate h, denoted Ch, is defined to be the intersection of the plane z = h with C. In this paper, we study the contour-line extraction problem, where we want to preprocess ...

  16. PRINT ONLY: MOON Goswami J. N. Thyagarajan K. Annadurai M.

    E-Print Network [OSTI]

    Rathbun, Julie A.

    to identify abundances of various lunar minerals, (iii) High resolution 3D mapping of the lunar surfacePRINT ONLY: MOON Goswami J. N. Thyagarajan K. Annadurai M. Chandrayaan-1: Indian Mission to Moon this scientific objective, include a Terrain Mapping Camera (TMC), a Hyper-Spectral Imager (HySI), a Low Energy X

  17. Mountain Precipitation and Hydrology in the Middle East Ronald. B. Smith*, Jason Evans*, Robert Oglesby**

    E-Print Network [OSTI]

    Evans, Jason

    Mountain Precipitation and Hydrology in the Middle East Ronald. B. Smith*, Jason Evans*, Robert shadow effect. Recent studies have tried to quantify this effect on Alpine terrain [Smith et al. 2003a model of this is the response to heating in a steady stratified stream [Smith and Lin, 1982

  18. Simultaneous Optimal Parameter and Mode Transition Time Estimation Lauren M. Miller and Todd D. Murphey1

    E-Print Network [OSTI]

    Hartmann, Mitra J. Z.

    vehicles (SSVs) present a challenge from modeling, trajectory-tracking, and control design perspec- tives generally necessitates either robust control techniques or accurate models of the vehicle dynamics values from coarsely sampled data for a skid-steered vehicle, which traverses unknown or changing terrain

  19. Mobility platform coupling device and method for coupling mobility platforms

    DOE Patents [OSTI]

    Shirey, David L. (Albuquerque, NM); Hayward, David R. (Albuquerque, NM); Buttz, James H. (Albuquerque, NM)

    2002-01-01T23:59:59.000Z

    A coupling device for connecting a first mobility platform to a second mobility platform in tandem. An example mobility platform is a robot. The coupling device has a loose link mode for normal steering conditions and a locking position, tight link mode for navigation across difficult terrain and across obstacles, for traversing chasms, and for navigating with a reduced footprint in tight steering conditions.

  20. The Poles of Mars: A Key to Understanding Earth's

    E-Print Network [OSTI]

    Faraon, Andrei

    snow cover on Earth, lies a permanent, residual polar cap #12;Ice Age made mainly of water ice. The residual cap at the south pole is smaller tban that of the north pole, and its carbon dioxide seasonal the residual caps, we see smooth, finely layered terrains with scarps that exhibit dark and light banded

  1. Lunar Laser Altimetry Studying the Topography

    E-Print Network [OSTI]

    Christian, Eric

    exploration on the Moon's surface we need to map the topography of the surface to ensure its safe on the surface). Currently, one of the best methods for determining topography is to use laser altimetry. While be important to know the topography or physical terrain of the surface of the Moon? This is a good time

  2. Urban Ecosystem Design Bedrich Benes

    E-Print Network [OSTI]

    Aliaga, Daniel G.

    Urban Ecosystem Design Bedrich Benes Michel Abdul Massih Philip Jarvis Purdue University Daniel G. Aliaga Carlos A. Vanegas a) b) c) Figure 1: This example demonstrates the need for urban ecosystems. The image in a) shows a terrain occupied by a wild ecosystem and b) displays the same ecosystem grown over

  3. JUNE 2000 327J A M E S E T A L . 2000 American Meteorological Society

    E-Print Network [OSTI]

    Yuter, Sandra

    and Visualization over Complex Terrain* CURTIS N. JAMES, STACY R. BRODZIK, HARRY EDMON, ROBERT A. HOUZE JR: the data stream from an operational radar, 3D topographical information, and the NCAR Zebra data visualization and integration software. MountainZebra operates routinely on a 3D data stream from the National

  4. WEED INFESTATIONS ARE GENERALLY MORE frequent along roadsides and other disturbed areas than

    E-Print Network [OSTI]

    Maxwell, Bruce D.

    in adjacent land, possibly because vehicles spread seeds into these areas and such areas provide suitable habitats for weed growth. Many types of vehicles, including passenger cars, 4-wheel drive (4WD) trucks, agricultural implements, tracked vehicles and all- terrain vehicles (ATVs) have been found to pick up seeds

  5. Assessing the impacts of military vehicle traffic on natural areas. Introduction to the special

    E-Print Network [OSTI]

    Fehmi, Jeffrey S.

    Assessing the impacts of military vehicle traffic on natural areas. Introduction to the special issue and review of the relevant military vehicle impact literature Alan B. Anderson a,*, Antonio J, and the International Society for Terrain-Vehicle Systems cosponsored a symposium titled ``Assessing the Impacts

  6. Geographia Technica, Special Issue, 2010, pp. 90 to 95 AUTOMATED SMALL-SCALE RELIEF SHADING: A NEW METHOD

    E-Print Network [OSTI]

    Jenny, Bernhard

    for the generalization of digital elevation models specifically designed to process digital elevation data visible at small scales. Small- scale shaded relief derived automatically from high-resolution digital are applied to digital terrain data, important ridges and valley edges are blurred, and their characteristic

  7. Prediction of kriging errors 601 Copyright 2005 John Wiley & Sons, Ltd. Earth Surf. Process. Landforms 30, 601612 (2005)

    E-Print Network [OSTI]

    Hung, I-Kuai

    Prediction of kriging errors 601 Copyright © 2005 John Wiley & Sons, Ltd. Earth Surf. Process. Landforms 30, 601­612 (2005) Earth Surface Processes and Landforms Earth Surf. Process. Landforms 30, 601). The construction of continuous surfaces including the digital elevation and terrain models (DEM, DTM) can

  8. Route profile analysis system and method

    DOE Patents [OSTI]

    Mullenhoff, D.J.; Wilson, S.W.

    1982-07-29T23:59:59.000Z

    A system for recording terrain profile information is disclosed. The system accurately senses incremental distances traveled by a vehicle along with vehicle inclination, recording both with elapsed time. The incremental distances can subsequently be differentiated with respect to time to obtain acceleration. The computer acceleration can then be used to correct the sensed inclination.

  9. REFERENCE: Introduction to Remote Sensing. James B.

    E-Print Network [OSTI]

    Gilbes, Fernando

    -viewing Wide Field-of-view Sensor (SeaWiFS) Advance Very High Resolution Radiometer (AVHRR) Synthetic Temperature #12;ACTIVE REMOTE SENSING The sensor illuminates the terrain with its own energy, then records the reflected energy as it has been altered by the earth's surface. #12;SIDE-LOOKING AIRBORNE RADAR SLAR #12

  10. A Three-Dimensional Geographic and Storm Surge Data Integration System for Evacuation Planning

    E-Print Network [OSTI]

    Chen, Shu-Ching

    @fiu.edu Abstract The rise of offshore water caused by the high winds of a low pressure weather system, or storm to construct a three-dimensional ocean po- sitioned over the terrain models. Ambient details such as wind, vegetation, ocean waves, and traffic are animated based on up-to-date wind and storm surge data. Videos

  11. The Interruption of Alpine Foehn by a Cold Front. Part I: Observations

    E-Print Network [OSTI]

    Gohm, Alexander

    propagation speed wf 1 m/s Inclination of the frontal surface is wf /uf 1/7.5 8° Freitag (1990 in valleys Interaction with local winds (e.g., foehn) foehn cold front Cold front in complex terrain ? ? #12 in Inn and Wipp Valley Temperature slope profile Doppler wind lidar in Wipp Valley #12;6 of 13 Case study

  12. A Unified Algorithm for Adaptive Spacetime Meshing

    E-Print Network [OSTI]

    Thite, Shripad

    : Wave equation describing displacement u(x, t) about the mean. utt - 2 uxx = 0 (i) wavespeed can terrain whose spatial projection is a triangulation Advance in time local neighborhood of front of dependence of Q. Approximate domains of dependence and influence by a circular symmetric double cone. Shripad

  13. EXECUTIVE SUMMARY: RETHINKING STANDBY & FIXED COST CHARGES REGULATORY & RATE DESIGN PATHWAYS TO DEEPER SOLAR PV COST

    E-Print Network [OSTI]

    for comparing multiple technologies and policies to one another), focusing exclusively on customer-sited solar customers to others constitute undue price discrimination against solar PV. Perhaps most damaging for solar TO DEEPER SOLAR PV COST REDUCTIONS The Current Terrain In recent years, electric utilities have experienced

  14. Integrating the Army Geospatial Enterprise: Synchronizing Geospatial-Intelligence to the Dismounted James E. Richards

    E-Print Network [OSTI]

    de Weck, Olivier L.

    1 Integrating the Army Geospatial Enterprise: Synchronizing Geospatial. #12;2 [This Page Intentionally Left Blank] #12;3 Army`s Geospatial Architecture: delivering Geospatial-Intelligence of complex and urban terrain to the dismounted Soldier by James E. Richards ABSTRACT The Army`s Geospatial

  15. Center for Quantum Science and Engineering Weekly Seminar

    E-Print Network [OSTI]

    Wu, Yih-Min

    to a hydrostatic pressure distribution. With the help of a terrain-fitted coordinate system and formulating, the model equations are of hyperbolic type which supports discontinuous weak solutions, ie. the hydraulic (a) Shiaolin landslide at t = 60 sec, (b) Overview of Shialin Village prior to the landslide

  16. Investigation of Automated Feature Extraction Using Multiple Data Sources

    E-Print Network [OSTI]

    Theiler, James

    and variety of platforms are now capable of collecting remote sensing data over a par- ticular scene. For many of data fusion is a hot-bed of activity. It is the aim of data fusion to integrate the data available from to assign a label to each pixel in an image, where the set of labels from which to choose is fixed. Terrain

  17. METEOROLOGYMETEOROLOGYMETEOROLOGYMETEOROLOGY 280280280280 Intro to Mountain MeteorologyIntro to Mountain MeteorologyIntro to Mountain MeteorologyIntro to Mountain Meteorology

    E-Print Network [OSTI]

    Clements, Craig

    and mesoscale wind and precipitation processes in mountainous terrain. 3. the surface energy budgets that lead and behavior evaluate mountain weather impacts on snow pack behavior Required Texts/Readings Mountain review and a term paper. Assignments will include both in-class and take home components and will include

  18. Guidelines on Safety in Field Research Responsible Unit: Office of Environmental Health and Safety

    E-Print Network [OSTI]

    Sokolowski, Marla

    or remote or politically unstable locations; extreme weather conditions; hazardous terrain; harmful wildlife and team leaders who are involved in directly supervising research on location. Due diligence must, the categories of risk that may be associated with each location and kind of field research and in determining

  19. Oregon State University Tuesdays, 4:00 p.m.

    E-Print Network [OSTI]

    Wright, Dawn Jeannine

    uses 3-D mapping, virtual reality, and terrain fly-through techniques to create vivid interpretations Oregon State University 3-D Scientific Visualization, High Performance Computer Graphics Feb 6 Mark of Earth Structure Mar 13 Bob Crippen NASA Jet Propulsion Lab Pasadena, CA NASA Shuttle Radar Topography

  20. Center for Environmental Management of Military Lands (970) 491-2748 cemml@cemml.colostate.edu

    E-Print Network [OSTI]

    operations, cross-country movement, wetlands, vegetation communities, terrain analysis, endangered species products are deliverable in hard and soft copy. GIS modeling and map products using Remotely Sensed Data, and remote sensing applications. Center staff can provide technical support remotely or on-site, to ensure

  1. Manipulating the Future: Predictor Based Feedback for Velocity Control in Virtual Environment Navigation

    E-Print Network [OSTI]

    New Hampshire, University of

    Manipulating the Future: Predictor Based Feedback for Velocity Control in Virtual Environment control. The predictor indicates to the user where and how fast he or sheis travelling and hasadirect manipulation feel to it. Experiences using the predictor to navigate over digital terrain maps are discussed

  2. ICARUS 132, 321343 (1998) ARTICLE NO. IS985897

    E-Print Network [OSTI]

    Hansen, Vicki

    ICARUS 132, 321­343 (1998) ARTICLE NO. IS985897 Ribbon Terrain Formation, Southwestern Fortuna at southwestern Fortuna Tessera; we extend our favors an upwelling model for highland plateau formation Fortuna Tessera) trough walls are parallel and matched and would exhibit a close fit if the trough

  3. Journal of Geological Society of Sri Lanka Vol. 15 (2013), 69-83 GEOTHERMAL ENERGY POTENTIAL IN SRI LANKA: A PRELIMINARY

    E-Print Network [OSTI]

    Jones, Alan G.

    Journal of Geological Society of Sri Lanka Vol. 15 (2013), 69-83 69 GEOTHERMAL ENERGY POTENTIAL faults or hot dry rock that would help geothermal energy development. Data show three regions, metamorphic terrains INTRODUCTION Geothermal energy development in Sri Lanka has been considered

  4. CVGIP: IMAGE UNDERSTANDING Vol. 59, No. 2. March, pp. 171-182, 1994

    E-Print Network [OSTI]

    Kim, Yong Jung

    Features from Elevation Maps IN So KWEON Department of Automation and Design Engineering, KAIST, Seoul. 130 astheautonomousnavigationinnatural terrain and the automation of map making process require high- level scene descriptions as well been studied in two research areas: in robotics, autonomous underwater vehicle (AUV) route planning

  5. Adaptive Selective Learning for Automatic Identification of Sub-Kilometer Craters

    E-Print Network [OSTI]

    Ding, Wei

    Martian terrain characterized by heterogeneous surface morphology. The experimental results demonstrate and present geological processes and provide the only tool for measuring rela- tive ages of observed geologic. Geologic stratigraphy based on manually collected databases has coarse spatial resolutions. Finer spatial

  6. Bernoulli Trials Based Feature Selection for Crater Detection

    E-Print Network [OSTI]

    Ding, Wei

    image exhibiting a heav- ily cratered Martian terrain characterized by heterogeneous surface morphology information about the past and present geological pro- cesses and provide the only tool for measuring relative ages of observed geologic formations [7]. It becomes extremely challenging to automatically count

  7. Fat Cowboy Horror Story The Kuskokwim River vaults down the flanks of the Alaska Range, and its vivid turquoise

    E-Print Network [OSTI]

    Albert, John

    fire. Oil lamps hung from the rafters of the tiny shack as the flames roared in a crude hearth over impassable terrain to Anchorage. Wind-driven snow lay deep over the land. The mercury was far fatigued, yet none slept. They sat in a ring in their crude chairs around the hearth, discussing events

  8. Placement of Traffic Barriers on Roadside and Median Slopes

    E-Print Network [OSTI]

    Ferdous, Md Rubiat

    2011-08-08T23:59:59.000Z

    on the findings obtained from crash tests performed on flat terrain. For barriers placed on roadside and median slopes, vehicle impact height varies depending on the trajectory of the vehicle along the ditch section and lateral offset of the barrier. Thus...

  9. Visual Control of an Autonomous Indoor Robotic Blimp

    E-Print Network [OSTI]

    Fisher, Bob

    in this chapter. Autonomous aerial vehicles have been an attractive platform for a wide range of applications, especially since they don't have the terrain limitations the autonomous ground vehicles face. They have been kind of autonomous aerial vehicles; they are wingless and have the ability to hover. This makes them

  10. Curriculum Policy of the Graduate School of Agricultural Science, Graduate Program Agricultural Science plans to conserve natural and artificial ecosystems and its ideal of

    E-Print Network [OSTI]

    Banbara, Mutsunori

    ) Environmental Informatics Terrain-Vehicle Systems Process Control Systems for Agri-food Materials Biomeasurement and Technology I-3 Advanced Science and Technology I-4 Advanced Science and Technology I-5 Food, Environmental and Healthy Life (Section of Food) Food, Environmental and Healthy Life (Section of Environment) Food

  11. ASES Proc. Solar 2010, Phoenix, AZ HIGH PERFORMANCE MSG SATELLITE MODEL FOR OPERATIONAL

    E-Print Network [OSTI]

    Perez, Richard R.

    ENERGY APPLICATIONS Tomás Cebecauer GeoModel, s.r.o. Pionierska 15 841 07 Bratislava, Slovakia tomas terrain affects exploitation of solar energy. In this article we present innovative features of MSG© ASES ­ Proc. Solar 2010, Phoenix, AZ HIGH PERFORMANCE MSG SATELLITE MODEL FOR OPERATIONAL SOLAR

  12. Modular Topology Control and Energy Model for Wireless Ad Hoc Sensor Networks

    E-Print Network [OSTI]

    Jay Yang, Shanchieh

    Modular Topology Control and Energy Model for Wireless Ad Hoc Sensor Networks Niranjan in a harsh terrain typically are battery operated and, therefore, require energy efficient network protocols. In order to ease the analysis of the energy usage of proposed network protocols, this paper proposes

  13. SEEP2010 Conference Proceedings, June 29th , Bari, ITALY

    E-Print Network [OSTI]

    Poggi, Davide

    System (GIS), Digital Terrain Models (DTM) and an existing database of the drinking water service focus on electricity generation by micro-hydro plants integrated in water supply systems, which convert the potential energy of water flowing in pipes into electric power at the lower end of the pipes. While other

  14. Highway Geology Symposium Santa Fe, 2008 HGS Session 5 -Paper 5.2 Page 1 of 21

    E-Print Network [OSTI]

    Haneberg, William C.

    59th Highway Geology Symposium Santa Fe, 2008 HGS Session 5 - Paper 5.2 Page 1 of 21 59 TH HIGHWAY GEOLOGY SYMPOSIUM 2008 Santa Fe, New Mexico SESSION 5 PAPER #5.2 REVISITING AN OLD PROJECT WITH NEW TECHNOLOGY-- DIGITAL TERRAIN MODELING AND MULTI-LAYERED VIRTUAL GEOLOGIC HAZARD MAPPING ALONG A PROPOSED

  15. This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research

    E-Print Network [OSTI]

    Lachniet, Matthew S.

    , particulate organic carbon (POC), air-bubble CO2, and dissolved organic carbon (DOC). Our new CO2 and DOC ages paleoclimate and carbon recycling in ancient permafrost terrain Matthew S. Lachniet a, , Daniel E. Lawson b of the persistence of old carbon in younger deposits. To investigate carbon dynamics and establish ice wedge

  16. Bringing traditional panorama projections from the painter's canvas to the digital realm

    E-Print Network [OSTI]

    Jenny, Bernhard

    projections that are generally not implemented in 3D-renderers, but are used for manual production of three for the background; the fisheye projection that portrays the terrain in an eye-catching manner; the "rubber for traditional analog production techniques as for modern computer-based rendering engines. From a geometrical

  17. Nonlinear Processes in Geophysics (2001) 8: 429438 Nonlinear Processes

    E-Print Network [OSTI]

    Boyer, Edmond

    2001-01-01T23:59:59.000Z

    Geophysical Society 2001 Mesoscale predictability under various synoptic regimes W. A. Nuss and D. K. Miller slightly ro- tated terrain are compared to gauge the sentivity of mesoscale forecasts to small forecast errors on the mesoscale in both wind and precipitation. The largest mesoscale errors occur when

  18. Tropical Cyclone Report Hurricane Irene

    E-Print Network [OSTI]

    and did not affect the island. The hurricane moved very close to the north coast of Hispaniola on 23's circulation with the high terrain of Hispaniola likely delayed additional intensification. As it moved away from Hispaniola early on 24 August, however, Irene began to strengthen. It became a category 3

  19. Free and forced motion in an asymmetric liquid-column oscillator

    E-Print Network [OSTI]

    Davidson, Fordyce A.

    terrain produces drag and creates a boundary-layer effect, making the tallest buildings particularly is analogous to that of the tuned liquid-column damper used to suppress oscillatory motion in large semi are designed to counteract the oscillatory motion of the building with their own momentum. The first auxiliary

  20. 6.9 A NEW APPROACH TO FIRE WEATHER FORECASTING AT THE TULSA WFO

    E-Print Network [OSTI]

    6.9 A NEW APPROACH TO FIRE WEATHER FORECASTING AT THE TULSA WFO Sarah J. Taylor* and Eric D. Howieson NOAA/National Weather Service Tulsa, Oklahoma 1. INTRODUCTION The modernization of the National then providesthemeteorologistanopportunitytoadjustmodel forecasts for local biases and terrain effects. The Tulsa, Oklahoma WFO has been a test office

  1. Guides in Cotton Irrigation on the High Plains.

    E-Print Network [OSTI]

    Swanson, N. P.; Thaxton, E. L. Jr.

    1956-01-01T23:59:59.000Z

    United States cotton crop and one-third the total Texas crop. The terrain is level and, 1 tiltrefore, is suited to large-scale, high-speed, aecl~anized operation. The soils have a high de- tree of inherent fertility and produce good yields r cotton...

  2. TAKU SHUTTLE YUKON DRIVE

    E-Print Network [OSTI]

    Ickert-Bond, Steffi

    Point Beluga Field Ice Rink Townshend Point TROTH YEDDHA' PARK HULBERT NANOOK TERRAIN PARK Facilities Nerland McIntosh Stevens Ice Arena Lola Tilly Wickersham Police Fire Dept Police Fire Dept MacLean House Nerland McIntosh Stevens Ice Arena Lola Tilly Student Recreation Center Wickersham Police Fire Dept Police

  3. Optic Flow Sensor Objective: Using optic flow sensors, detect and track

    E-Print Network [OSTI]

    Wirthlin, Michael J.

    Optic Flow Sensor Objective: Using optic flow sensors, detect and track the walls of a rural or urban terrain. Principle Investigators: Tim McLain, Randy Beard Optic Flow Sensor · Computationally factor ­ 1" x 1" x 1.5" · Inexpensive ­ $80 including optics · Fast ­ computes optic flow at 2300 fps2006

  4. Technical Report Documentation Page 1. Report No.

    E-Print Network [OSTI]

    Texas at Austin, University of

    from the door zone, and operationally, a bicycle lane is more effective than a wide outside lane characteristics, and (6) roadway operational characteristics. The data used in the analysis is drawn from a web; and roadway terrain. 17. Key Words Bicycle Facility Design, Bicycle route choice analysis, Stated preference

  5. Range imaging: a new method for high-resolution topographic measurements in small-and medium-

    E-Print Network [OSTI]

    Kirchner, James W.

    Range imaging: a new method for high-resolution topographic measurements in small- and medium is a useful complement or alternative to existing methods for high-resolution measurements in small- to medium has led to a dramatic increase in terrain information and opened up new opportunities for hydro- logic

  6. Chapter One General Introduction and

    E-Print Network [OSTI]

    Xue, Ming

    system, i.e. the quasi­nonhydrostatic system in pressure­based sigma­ coordinates (Miller and White, 1984; ­ 2 ­ s­coordinates by Miller and White (1984) so that irregular bottom terrain can be treated are described first. The current model includes three water phases, namely, water vapour, cloud water and rain

  7. DEVELOPMENT OF REAL TIME FLOOD PREDICTION CAPABILITIES IN PUERTO RICO TO EVALUATE UNCERTAINTIES

    E-Print Network [OSTI]

    Gilbes, Fernando

    DEVELOPMENT OF REAL TIME FLOOD PREDICTION CAPABILITIES IN PUERTO RICO TO EVALUATE UNCERTAINTIES of Electrical and Computer Engineering 1,2,3 University of Puerto Rico at Mayagüez Abstract Due to the complex terrain and the tropical influence, Puerto Rico is characterized by small watersheds, high rainfall

  8. Vronique Ginouvs, Responsable des archives sonores de la MMSH,

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    ://phonotheque.hypotheses.org Marceau Gast (1927-2010), un ethnologue passeur de ses sources de terrain Intervention présentée lors des journées d'hommage à Marceau Gast, Un ethnologue entre Sahara, Kabylie, Yémen et Queyras : Itinéraire 2004 puis en 2005, Marceau Gast, ethnologue, a déposé à la phonothèque de la MMSH (Maison

  9. Decision Making of Mobile Robot in the Presence of Risk on Its Surroundings

    E-Print Network [OSTI]

    Huh, Sung

    2012-02-14T23:59:59.000Z

    Mobile robots are used on many areas and its demand on extreme terrain, hazardous area, or life-threatening place is increasing to reduce the loss of life. A good decision making capability is essential for successful navigation of autonomous robot...

  10. Letting Go: True autonomy in an AUV

    E-Print Network [OSTI]

    Griffiths, Gwyn

    Will be needed if we are to explore the ocean beneath EuropaÕs ice-covered surface. #12;Satellite images,000 feet Which is which? #12;Face of the Ronne Ice Shelf, Antarctica `To penetrate this barrier) Distancefromseasurface(m) Start Point Surfacing for GPS position fixing Terrain Following #12;Studies in Upper Ocean

  11. Ordering points for incremental TIN construction from James J. Little and Ping Shi

    E-Print Network [OSTI]

    Little, Jim

    Ordering points for incremental TIN construction from DEMs James J. Little and Ping Shi Department approximations to terrain surfaces (TINs) from dense digital elevation models(DEMs) adds points to an initial in the current TIN, the worst fitting point, in terms of vertical distance, is selected. The order of insertion

  12. Convective Snowbands Downstream of the Rocky Mountains in an Environment with Conditional, Dry Symmetric, and Inertial Instabilities

    E-Print Network [OSTI]

    Schumacher, Russ

    Convective Snowbands Downstream of the Rocky Mountains in an Environment with Conditional, Dry quickly equatorward. The bands occurred downstream of complex terrain on the anticyclonic-shear side banners downstream of mountains, and in association with frontogenetical ascent along two baroclinic zones

  13. Integration Integration

    E-Print Network [OSTI]

    Gupta, Abhinav

    , these field tests are helping to demon- strate and influence the use of autonomous vehicles in the future. UPI autonomous ground vehicle platforms available today. Ft. Carson, CO, August 2006Ft. Carson, CO, August 2006 unmanned vehicle, "SPINNER," that couples extreme terrainability with fuel efficiency, survivability

  14. Design Project -SIE 2010 Inventaire des missions

    E-Print Network [OSTI]

    miscanthus Mise en place d'un outil d'aide à la décision pour la gestion des sites contaminés: le cas de la gestion des parcelles de terrain contaminées autour de l'ancienne usine de Metaleurop Nord en se: NOx, particules fines, Zn, Al, CO2, NH3 et Atrazine (pesticides) Mesures au niveau régional Gestion

  15. Ire rationnelle ? | 1 Ire rationnelle ?

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    quels chemins l'Allemagne, sur le terrain de la philosophie, en est arrivée à Hitler » et de « démasquer « entreprise » dont Hitler fut le héraut et l'Allemagne, plus que tout autre pays européen, le théâtre apparaît faschistiche Philosophie in Deustchland entstanden ? rédigé peu de temps après la prise du pouvoir par Hitler

  16. Dr. Lewis Ntaimo Industrial and Systems Engineering

    E-Print Network [OSTI]

    Ding, Yu

    for renewable energy, including wind energy, is cost and marketability and that wind energy is perhaps the most of the cost of wind energy generation, depending on wind farm size, terrain and other factors. "You can in the market. However, to sustain wind energy generation and increase its market share, industry needs

  17. www.ext.vt.edu Produced by Communications and Marketing, College of Agriculture and Life Sciences, Virginia Polytechnic Institute and State University, 2014

    E-Print Network [OSTI]

    Liskiewicz, Maciej

    ? ___________________ 7.SOIL: Type Terrain Drainage Soil-less Mulch q sandy q sloped q good q pinebark q bark chips q clay q level q moderate q peat moss q plastic q loam q low q poor q other _________q other _________ q

  18. Yann-Hang Lee and Daeyoung Kim Real Time Systems Research Laboratory

    E-Print Network [OSTI]

    Younis, Mohamed

    of Florida {yhlee, dkim}@cise.ufl.edu Mohamed Younis, Jeff Zhou, James McElroy Honeywell International Inc. {mohamed.younis, jeff.zhou, james.mcelroy} @honeywell.com Abstract In the recent development of avionics, the Honeywell's Enhanced Ground Proximity Warning System (EGPWS) consists of tasks for map loading, terrain

  19. References R-3 Note: In this report we refer to a number of documents (e.g., plans, reports) that are intended for

    E-Print Network [OSTI]

    Pennycook, Steve

    . A Glossary of Terms in Nuclear Science and Technology, American Nuclear Society, La Grange Park, Illinois. ANSI. 1969. Guide to Sampling Airborne Radioactive Materials in Nuclear Facilities, ANSI N13.1-1969R, K. R. 2003. Vertical Transport and Mixing During Winter over a Ridge-and-Valley Terrain. (Not yet

  20. References R-3 Note: In this report we refer to a number of documents (e.g., plans, reports) that are intended for

    E-Print Network [OSTI]

    Pennycook, Steve

    . A Glossary of Terms in Nuclear Science and Technology, American Nuclear Society, La Grange Park, Illinois. ANSI. 1969. Guide to Sampling Airborne Radioactive Materials in Nuclear Facilities. ANSI N13.1-1969R. Vertical Transport and Mixing During Winter over a Ridge-and-Valley Terrain (not published). BJC. 2002

  1. Glaciers of the McMurdo dry valleys: Terrestrial analog for Martian polar sublimation

    E-Print Network [OSTI]

    Fountain, Andrew G.

    ice caps, and circular pits that make up the ``Swiss cheese'' terrain appear on the south polar cap caps, where dust accumulation and sublimation are significant but surface melting is absent. We have developed in the ice. Troughs are up to 1 km deep and 10 km wide; in the south polar cap some are 150 km

  2. Pre-burning wxperiments commence in August 2008. A controlled burning takes place late September 2008 and field observations continues untill at least

    E-Print Network [OSTI]

    of climate change for the Mediterranean region suggest that intensity and length of summer drought periods will further increase and that annual precipitation will further decrease. These changes in climate Archipelago National Park Climate: Mediterranean. Rainfall ~350 mm. Air temp of about 20°C Terrain: Pianosa

  3. Professional Aspects of Electrical and Computer Engineering Dept. of Electrical and Computer Engineering

    E-Print Network [OSTI]

    Generation System Your company designs, manufactures, and distributes electricity generation systems. It has generation system for persons in under-developed countries. Your company did some preliminary investigations-6hr walk in mountainous terrain. · Diesel fuel or gasoline is prohibitively expensive in most areas

  4. Submitted to FSR'07, 9-12 July 2007, Chamonix, France (authors' manuscript do not distribute)

    E-Print Network [OSTI]

    Zimmer, Uwe

    on a plane above the terrain and use field values measured by the individual robots to locally reconstruct of constant altitude. A set of these recorded iso-contours can then be used to reconstruct the field using) and are sometimes even meaningless. In [5], a sin- gle vehicle uses a history of past field values. In [6], UUV- gas

  5. PAPERS ON TERRITORIAL INTELLIGENCE AND GOVERNANCE PARTICIPATORY ACTION-RESEARCH AND TERRITORIAL DEVELOPMENT

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    to water, gas, electric or phone networks, etc. Finally, as regards environment, uncontrolled urban sprawl farming activities by influencing the price of terrains, etc. However on the other hand, it does not seem. On a quantitative point of view, the increase of the households in the suburbs (decrease of the

  6. Impact glasses from the Apollo 14 landing site and implications for regional geology

    E-Print Network [OSTI]

    Spudis, Paul D.

    Impact glasses from the Apollo 14 landing site and implications for regional geology N. E. B are regolith developed on different terrains and local rock types. Almost 800 glasses from the Apollo 14 provenance of Apollo 14 samples and suggests that the highlands in the Fra Mauro region of the Moon consist

  7. 2. BACKGROUND This chapter presents the background information required to understand later chapters in the

    E-Print Network [OSTI]

    Toronto, University of

    85] [BMW87]. Procedural descriptions of motion, often based on real­world data and observations, can to environments different from the one in which they are obtained. Varying terrain and collisions are two examples of such potentially desirable changes. As the demand for fully interactive environments increases, this i

  8. A stochastic sediment delivery model for a steep Mediterranean Emmanuel J. Gabet

    E-Print Network [OSTI]

    Gabet, Emmanuel "Manny"

    of Environmental Science and Management and Department of Geological Sciences, University of California, Santa of vegetation communities. For example, sediment transport by tree-throw contributes to soil creep in forested transport processes, yet few investigations have formally linked climate and terrain characteristics

  9. Session: Wind resources and site characterisation 2 (DW3.5) Track: Technical

    E-Print Network [OSTI]

    including wind shear, turbulence intensities etc., at potential wind turbine positions. - ApplicationSession: Wind resources and site characterisation 2 (DW3.5) Track: Technical THE BOLUND EXPERIMENT - A NEW DATASET OF LOCAL WIND CONDITIONS IN COMPLEX TERRAIN (abstract-ID: 357) Jeppe Johansen (Risø DTU

  10. Ris-R-Report Investigation of turbulence measurements

    E-Print Network [OSTI]

    many times that the mean horizontal wind speed measured by a lidar over flat terrain compares very well. We then evaluate this model by comparing the theoretical results to experimental data obtained.......................................................12 3.1 What can a cw conically scanning lidar tell us about turbulence?...12 3.2 Illustration

  11. 3-D Point Cloud Generation from Rigid and Flexible Stereo Vision Systems

    E-Print Network [OSTI]

    Kochersberger, Kevin

    3-D Point Cloud Generation from Rigid and Flexible Stereo Vision Systems Nathaniel J. Short Thesis Calibration, Terrain Mapping Copyright 2009 #12;3-D Point Cloud Generation from Rigid and Flexible Stereo of tools have been developed to generate 3-D point clouds from rigid and flexible stereo systems, along

  12. Division of Agricultural Sciences and Natural Resources Oklahoma State University Douglas W. Hamilton

    E-Print Network [OSTI]

    Balasundaram, Balabhaskar "Baski"

    . Categories of dispersion condi- tions, based on solar radiation, cloud cover, and wind speed, are given, decreases as cloud cover decreases. 3. With moderate to high winds (greater than 13 mph), wind speed), with the best conditions for a given wind speed occurring under strong solar radiation. Terrain Effects

  13. Feasibility Study for an Autonomous UAV -Magnetometer System -- Final Report on SERDP SEED 1509:2206

    SciTech Connect (OSTI)

    Roelof Versteeg; Mark McKay; Matt Anderson; Ross Johnson; Bob Selfridge; Jay Bennett

    2007-09-01T23:59:59.000Z

    Large areas across the United States are potentially contaminated with UXO, with some ranges encompassing tens to hundreds of thousands of acres. Technologies are needed which will allow for cost effective wide area scanning with 1) near 100 % coverage and 2) near 100 % detection of subsurface ordnance or features indicative of subsurface ordnance. The current approach to wide area scanning is a multi-level one, in which medium altitude fixed wing optical imaging is used for an initial site assessment. This assessment is followed with low altitude manned helicopter based magnetometry followed by surface investigations using either towed geophysical sensor arrays or man portable sensors. In order to be effective for small UXO detection, the sensing altitude for magnetic site investigations needs to be on the order of 1 – 3 meters. These altitude requirements means that manned helicopter surveys will generally only be feasible in large, open and relatively flat terrains. While such surveys are effective in mapping large areas relatively fast there are substantial mobilization/demobilization, staffing and equipment costs associated with these surveys (resulting in costs of approximately $100-$150/acre). Surface towed arrays provide high resolution maps but have other limitations, e.g. in their ability to navigate rough terrain effectively. Thus, other systems are needed allowing for effective data collection. An UAV (Unmanned Aerial Vehicle) magnetometer platform is an obvious alternative. The motivation behind such a system is that it would be safer for the operators, cheaper in initial and O&M costs, and more effective in terms of site characterization. However, while UAV data acquisition from fixed wing platforms for large (> 200 feet) stand off distances is relatively straight forward, a host of challenges exist for low stand-off distance (~ 6 feet) UAV geophysical data acquisition. The objective of SERDP SEED 1509:2006 was to identify the primary challenges associated with a low stand off distance autonomous UAV magnetometer platform and to investigate whether these challenges can be resolved successfully such that a successful UAV magnetometer platform can be constructed. The primary challenges which were identified and investigated include: 1. The feasibility of assembling a payload package which integrates magnetometers, accurate positioning systems (DGPS, height above ground measurement), obstacle avoidance systems, power infrastructure, communications and data storage as well as auxiliary flight controls 2. The availability of commercial UAV platforms with autonomous flight capability which can accommodate this payload package 3. The feasibility of integrating obstacle avoidance controls in UAV platform control 4. The feasibility of collecting high quality magnetic data in the vicinity of an UAV.

  14. A Rough Road Leads To The Stars

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

    launch. Additional support equipment necessary to open the flight unit after recovery including a special saw, a radiation shield, and other necessary tools and radiation...

  15. X-ray reflectivity and surface roughness

    SciTech Connect (OSTI)

    Ocko, B.M.

    1988-01-01T23:59:59.000Z

    Since the advent of high brightness synchrotron radiation sources there has been a phenomenal growth in the use of x-rays as a probe of surface structure. The technique of x-ray reflectivity is particularly relevant to electrochemists since it is capable of probing the structure normal to an electrode surface in situ. In this paper the theoretical framework for x-ray reflectivity is reviewed and the results from previous non-electrochemistry measurements are summarized. These measurements are from the liquid/air interface (CCl/sub 4/), the metal crystal vacuum interface (Au(100)), and from the liquid/solid interface(liquid crystal/silicon). 34 refs., 5 figs.

  16. Diffusion in a rough potential revisited

    E-Print Network [OSTI]

    Banerjee, Saikat; Seki, Kazuhiko; Bagchi, Biman

    2014-01-01T23:59:59.000Z

    Rugged energy landscapes find wide applications in diverse fields ranging from astrophysics to protein folding. We study the dependence of diffusion coefficient $(D)$ of a Brownian particle on the distribution width $(\\varepsilon)$ of randomness in a Gaussian random landscape by simulations and theoretical analysis. We first show that the elegant expression of Zwanzig [PNAS, 85, 2029 (1988)] for $D(\\varepsilon)$ can be reproduced exactly by using the Rosenfeld diffusion-entropy scaling relation. Our simulations show that Zwanzig's expression overestimates $D$ in an uncorrelated Gaussian random lattice - differing by almost an order of magnitude at moderately high ruggedness. The disparity originates from the presence of "three-site traps" (TST) on the landscape -- which are formed by the presence of deep minima flanked by high barriers on either side. Using mean first passage time formalism, we derive a general expression for the effective diffusion coefficient in the presence of TST, that quantitatively repr...

  17. Effect of Roughness Geometry on Wetting and Dewetting of Rough PDMS Surfaces

    E-Print Network [OSTI]

    Daniel, Susan

    was studied as model for print surfaces used in additive manufacturing and printed electronics. A smooth PDMS on decline for over a decade,9 printing has evolved and has become a manufacturing technology for flexible are keys to a successful implementation of ink printing in manufacturing. Arias et al.4 showed that balance

  18. Turbulent flow over a house in a simulated hurricane boundary layer

    E-Print Network [OSTI]

    Taylor, Zachary; Gurka, Roi; Kopp, Gregory

    2009-01-01T23:59:59.000Z

    Every year hurricanes and other extreme wind storms cause billions of dollars in damage worldwide. For residential construction, such failures are usually associated with roofs, which see the largest aerodynamic loading. However, determining aerodynamic loads on different portions of North American houses is complicated by the lack of clear load paths and non-linear load sharing in wood frame roofs. This problem of fluid-structure interaction requires both wind tunnel testing and full-scale structural testing. A series of wind tunnel tests have been performed on a house in a simulated atmospheric boundary layer (ABL), with the resulting wind-induced pressures applied to the full-scale structure. The ABL was simulated for flow over open country terrain where both velocity and turbulence intensity profiles, as well as spectra, were matched with available full scale measurements for this type of terrain. The first set of measurements was 600 simultaneous surface pressure measurements over the entire house. A key...

  19. Process for structural geologic analysis of topography and point data

    DOE Patents [OSTI]

    Eliason, Jay R. (Richland, WA); Eliason, Valerie L. C. (Richland, WA)

    1987-01-01T23:59:59.000Z

    A quantitative method of geologic structural analysis of digital terrain data is described for implementation on a computer. Assuming selected valley segments are controlled by the underlying geologic structure, topographic lows in the terrain data, defining valley bottoms, are detected, filtered and accumulated into a series line segments defining contiguous valleys. The line segments are then vectorized to produce vector segments, defining valley segments, which may be indicative of the underlying geologic structure. Coplanar analysis is performed on vector segment pairs to determine which vectors produce planes which represent underlying geologic structure. Point data such as fracture phenomena which can be related to fracture planes in 3-dimensional space can be analyzed to define common plane orientation and locations. The vectors, points, and planes are displayed in various formats for interpretation.

  20. Sustainable Energy Solutions Task 5.1:Expand the Number of Faculty Working in Wind Energy: Wind Energy Supply Chain and Logistics

    SciTech Connect (OSTI)

    Janet M Twomey, PhD

    2010-04-30T23:59:59.000Z

    EXECUTIVE SUMARRY Wind as a source of energy has gained a significant amount of attention because it is free and green. Construction of a wind farm involves considerable investment, which includes the cost of turbines, nacelles, and towers as well as logistical costs such as transportation of oversized parts and installation costs such as crane-rental costs. The terrain effects at the project site exert considerable influence on the turbine assembly rate and the project duration, which increases the overall installation cost. For higher capacity wind turbines (>3MW), the rental cost of the cranes is significant. In this study, the impact of interest rate, sales price of electricity, terrain effects and availability of cranes on the duration of installation and payback period for the project is analyzed. Optimization of the logistic activities involved during the construction phase of a wind farm contributes to the reduction of the project duration and also increases electricity generation during the construction phase.