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


1

Optimization and learning for rough terrain legged locomotion  

Science Conference Proceedings (OSTI)

We present a novel approach to legged locomotion over rough terrain that is thoroughly rooted in optimization. This approach relies on a hierarchy of fast, anytime algorithms to plan a set of footholds, along with the dynamic body motions required ... Keywords: Legged robots, adaptive control, mobile robotics, motion control, nonholonomic motion planning

Matt Zucker; Nathan Ratliff; Martin Stolle; Joel Chestnutt; J Andrew Bagnell; Christopher G Atkeson; James Kuffner

2011-02-01T23:59:59.000Z

2

Rough Terrain Autonomous Mobility—Part 2: An Active Vision, Predictive Control Approach  

Science Conference Proceedings (OSTI)

Off-road autonomous navigation is one of the most difficult automation challenges from the point of view of constraints on mobility, speed of motion, lack of environmental structure, density of hazards, and typical lack of prior information. ... Keywords: autonomous vehicles, goal-seeking, mobile robots, obstacle avoidance, requirements analysis, rough terrain mobility, terrain mapping, trajectory generation

Alonzo Kelly; Anthony Stentz

1998-05-01T23:59:59.000Z

3

Hazard avoidance for high-speed rough-terrain unmanned ground vehicles  

E-Print Network (OSTI)

High-speed unmanned ground vehicles have important applications in rough-terrain. In these applications unexpected and dangerous situations can occur that require rapid hazard avoidance maneuvers. At high speeds, there is ...

Spenko, Matthew J. (Matthew Julius), 1976-

2005-01-01T23:59:59.000Z

4

Derivation of Effective Aerodynamic Surface Roughness in Urban Areas from Airborne Lidar Terrain Data  

Science Conference Proceedings (OSTI)

An automated technique was developed that uses only airborne lidar terrain data to derive the necessary parameters for calculation of effective aerodynamic surface roughness in urban areas. The technique provides parameters for geometric models ...

Donald E. Holland; Judith A. Berglund; Joseph P. Spruce; Rodney D. McKellip

2008-10-01T23:59:59.000Z

5

Urbanizing terrains  

E-Print Network (OSTI)

Urban "sprawl"in the East Attica area of Athens has dramatically changed the former rural economy in a manner consistent with the urbanizing terrain's underlying properties: agricultural subdivisions, existing centres, ...

Romanos, Christoforos

2008-01-01T23:59:59.000Z

6

Slope preserving lossy terrain compression  

Science Conference Proceedings (OSTI)

Accurate terrain representation with appropriate preservation of important terrain characteristics, especially slope steepness, is becoming more crucial and fundamental as the geographical models are becoming more complex. Based on our earlier success ... Keywords: GIS, PDE solver, terrain elevation data set compression, terrain modeling

Zhongyi Xie; W. Randolph Franklin; Daniel M. Tracy

2010-11-01T23:59:59.000Z

7

Representing Drag on Unresolved Terrain as a Distributed Momentum Sink  

Science Conference Proceedings (OSTI)

In numerical weather prediction models, drag on unresolved terrain is usually represented by augmenting the boundary drag on the model atmosphere, in terms of an effective surface roughness length. But as is shown here, if a terrain-following ...

John D. Wilson

2002-05-01T23:59:59.000Z

8

Improved visibility computation on massive grid terrains  

Science Conference Proceedings (OSTI)

This paper describes the design and engineering of algorithms for computing visibility maps on massive grid terrains. Given a terrain T, specified by the elevations of points in a regular grid, and given a viewpoint v, the visibility ...

Jeremy Fishman; Herman Haverkort; Laura Toma

2009-11-01T23:59:59.000Z

9

Turbulent Kinetic Energy Budgets over Mountainous Terrain  

Science Conference Proceedings (OSTI)

The objective of this study is to describe the characteristics of the airflow and turbulence structure over mountainous terrain. Turbulent characteristics of the airflow were measured using well-instrumented aircraft. The shear, buoyancy, ...

Theodore S. Karacostas; John D. Marwitz

1980-02-01T23:59:59.000Z

10

On Thermally Forced Circulations over Heated Terrain  

Science Conference Proceedings (OSTI)

A combination of analytical and numerical models is used to gain insight into the dynamics of thermally forced circulations over diurnally heated terrain. Solutions are obtained for two-layer flows (representing the boundary layer and the ...

Daniel J. Kirshbaum

2013-06-01T23:59:59.000Z

11

The Terrain-Induced Rotor Experiment  

Science Conference Proceedings (OSTI)

The Terrain-Induced Rotor Experiment (T-REX) is a coordinated international project, composed of an observational field campaign and a research program, focused on the investigation of atmospheric rotors and closely related phenomena in complex ...

Vanda Grubiši?; James D. Doyle; Joachim Kuettner; Richard Dirks; Stephen A. Cohn; Laura L. Pan; Stephen Mobbs; Ronald B. Smith; C. David Whiteman; Stanley Czyzyk; Simon Vosper; Martin Weissmann; Samuel Haimov; Stephan F. J. De Wekker; Fotini Katopodes Chow

2008-10-01T23:59:59.000Z

12

Wind and Diffusion Modeling for Complex Terrain  

Science Conference Proceedings (OSTI)

Atmospheric transport and dispersion over complex terrain were investigated. Meteorological and sulfur hexafluoride (SF6) concentration data were collected and used to evaluate the performance of a transport and diffusion model coupled with a ...

Robert M. Cox; John Sontowski; Richard N. Fry Jr.; Catherine M. Dougherty; Thomas J. Smith

1998-10-01T23:59:59.000Z

13

Daytime heat transfer processes over mountainous terrain  

Science Conference Proceedings (OSTI)

The daytime heat transfer mechanisms over mountainous terrain are investigated by means of large-eddy simulations over idealized valleys. Two- and three-dimensional topographies, corresponding to infinite and finite valleys, are used in order to ...

Juerg Schmidli

14

Dispersion into Severe Coastal Complex Terrain  

Science Conference Proceedings (OSTI)

A field study of dispersion using tracer gases from offshore sources into severe coastal complex terrain was conducted in central California. Data were collected on dispersion, surface concentrations trajectories, and stability. An examination of ...

Timothy C. Spangler; James W. Keating

1990-01-01T23:59:59.000Z

15

The Lidars in Flat Terrain (LIFT) Experiment  

Science Conference Proceedings (OSTI)

The authors describe and present early results from the July_August 1996 Lidars in Flat Terrain (LIFT) experiment. LIFT was a boundary layer experiment that made use of recently developed Doppler, aerosol backscatter, and ozone lidars, along with ...

Stephen A. Cohn; Shane D. Mayor; Christian J. Grund; Tammy M. Weckwerth; Christoph Senff

1998-07-01T23:59:59.000Z

16

A Novel Five Wheeled Rover for All Terrain Navigation  

Science Conference Proceedings (OSTI)

This paper presents a new concept for rough terrain navigation of rovers. The proposed design has reduced number of joints and links from existing suspension concepts. The suspension mechanism is derived from planar four bar mechanism and hence we present ... Keywords: Four bar mechanism, linear programming and dynamics, singularity

Arun Kumar Singh; Arun H. Patil; Anup Kumar Saha

2009-12-01T23:59:59.000Z

17

Real-Time streaming and rendering of terrains  

Science Conference Proceedings (OSTI)

Terrains and other geometric models have been traditionally stored locally. Their remote access presents the characteristics that are a combination of file serving and realtime streaming like audio-visual media. This paper presents a terrain streaming ...

Soumyajit Deb; Shiben Bhattacharjee; Suryakant Patidar; P. J. Narayanan

2006-12-01T23:59:59.000Z

18

Instability Analysis of Terrain-Induced Canopy Flows  

Science Conference Proceedings (OSTI)

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

Chuixiang Yi

2009-07-01T23:59:59.000Z

19

Empirical-Statistical Method to Estimate the Surface Wind Speed over Complex Terrain  

Science Conference Proceedings (OSTI)

An empirical-statistical method to estimate surface wind speed over complex terrain under strong wind condition is proposed. This method is based on the postulation that the surface wind speed depends on a surface roughness parameter and a ...

Hiromi Yamazawa; Junsei Kondo

1989-09-01T23:59:59.000Z

20

A System for the Hourly Assimilation of Surface Observations in Mountainous and Flat Terrain  

Science Conference Proceedings (OSTI)

An assimilation system is presented that was designed to provide timely, detailed, and coherent analyses of surface data, even when the data are collected in rough terrain where station elevations differ widely and observations are often subject ...

Patricia A. Miller; Stanley G. Benjamin

1992-10-01T23:59:59.000Z

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


21

Vibration-based terrain classification for electric powered wheelchairs  

Science Conference Proceedings (OSTI)

Automated terrain classification for electric powered wheelchairs (EPWs) has two primary motivations. First, certain terrains (e.g., sand and gravel) make wheelchair mobility more difficult. To alleviate this problem the wheelchair control system can ... Keywords: advanced wheelchair systems, electric powered wheelchairs, terrain classification, vibrations

Eric Coyle; Emmanuel G. Collins, Jr.; Edmond DuPont; Dan Ding; Hongwu Wang; Rory A. Cooper; Garrett Grindle

2008-04-01T23:59:59.000Z

22

Real-time tessellation of terrain on graphics hardware  

Science Conference Proceedings (OSTI)

Synthetic terrain is a key element in many applications, which can lessen the sense of realism if it is not handled correctly. We propose a new technique for visualizing terrain surfaces by tessellating them on the GPU. The presented algorithm introduces ... Keywords: GPU, Level of detail, Real-time rendering, Terrain simulation, Tessellation

Oscar Ripolles; Francisco Ramos; Anna Puig-Centelles; Miguel Chover

2012-04-01T23:59:59.000Z

23

Electric Utility Terrain Vehicle Demonstration in a Military Base Application  

Science Conference Proceedings (OSTI)

Utility terrain vehicles (UTVs), also called all terrain vehicles (ATVs), are used for a variety of purposes ranging from transporting people and materials to recreation. Examples of uses include transportation at military bases, for beach patrols, at ports, agricultural locations, industrial sites, and local/municipal applications such as at parks and schools. As of August 30, 2012 the Federal Highway Administration estimated that annual fuel usage of All-terrain vehicles to be approximately 173 ...

2013-07-24T23:59:59.000Z

24

Alteration of Terrain Permits (New Hampshire) | Department of Energy  

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

Alteration of Terrain Permits (New Hampshire) Alteration of Terrain Permits (New Hampshire) Alteration of Terrain Permits (New Hampshire) < Back Eligibility Agricultural Commercial Construction Fed. Government Fuel Distributor General Public/Consumer Industrial Installer/Contractor Institutional Investor-Owned Utility Local Government Low-Income Residential Multi-Family Residential Municipal/Public Utility Nonprofit Residential Retail Supplier Rural Electric Cooperative Schools State/Provincial Govt Systems Integrator Transportation Tribal Government Utility Savings Category Alternative Fuel Vehicles Hydrogen & Fuel Cells Buying & Making Electricity Water Home Weatherization Solar Wind Program Info State New Hampshire Program Type Siting and Permitting Provider NH Department of Environmental Services Alteration of Terrain Bureau

25

Zigbee-based Internet of Things in 3D Terrains  

Science Conference Proceedings (OSTI)

This paper focuses on the Zigbee-based Internet of Things (IoTs) in 3D terrains. A novel simulation model for IoT is proposed. The effects of various terrains, node's mobility and traffic loads are investigated in this study. Many comprehensive studies ...

Mu-Sheng Lin, Jenq-Shiou Leu, Kuen-Han Li, Jean-Lien C. Wu

2013-08-01T23:59:59.000Z

26

Multiple-Scale Terrain Forcing of Local Wind Fields  

Science Conference Proceedings (OSTI)

Observations and numerical simulations with a hydrostatic model are used to examine effects of regional and local terrain, synoptic forcing, and stability on the wind fields of an intermountain basin. The study area is centered on the Hanford ...

J. C. Doran; E. D. Skyllingstad

1992-05-01T23:59:59.000Z

27

An Observational and Prognostic Numerical Investigation of Complex Terrain Dispersion  

Science Conference Proceedings (OSTI)

The Atmospheric Studies in Complex Terrain Program conducted a field experiment at the interface of the Rocky Mountains and the Great Plains in the winter of 1991. Extensive meteorological observations were taken in northeastern Colorado near ...

Gregory S. Poulos; James E. Bossert

1995-03-01T23:59:59.000Z

28

Boundary-layer updrafts driven by airflow over heated terrain  

Science Conference Proceedings (OSTI)

This study presents linear and nonlinear scalings for boundary-layer ascent forced by airflow over heated terrain and compares them to results from corresponding high-resolution numerical simulations. Close agreement between theory and simulation ...

Daniel J. Kirshbaum; Chun-Chih Wang

29

On the Computation of Gradients from Observations over Complex Terrain  

Science Conference Proceedings (OSTI)

A mathematical scheme is developed to compute the gradients of observations taken over complex terrain. The method is applied to an artificial example to demonstrate the scheme. An application is made to surface pressure observations between ...

Fred J. Kopp; Paul L. Smith; Harold D. Orville

2001-10-01T23:59:59.000Z

30

Flow over Heated Terrain. Part II: Generation of Convective Precipitation  

Science Conference Proceedings (OSTI)

Previous studies have shown that thunderstorms in the Rocky Mountain region have preferred areas in which to form. There has been some indication that these areas depend on the midtropospheric wind direction. A nonhydrostatic model with a terrain-...

Donna F. Tucker; N. Andrew Crook

2005-09-01T23:59:59.000Z

31

Evaluation of an Air Pollution Analysis System for Complex Terrain  

Science Conference Proceedings (OSTI)

This paper describes results from a study to evaluate components of an operational air quality modeling system for complex terrain. In particular, the Cinder Cone Butte (CCB) “modeler's dataset” is used to evaluate the current technique for ...

D. G. Ross; D. G. Fox

1991-07-01T23:59:59.000Z

32

Implication of Spatial Averaging in Complex-Terrain Wind Studies  

Science Conference Proceedings (OSTI)

Studies of wind over complex terrain have been conducted at three times and two locations in Northern California. Instrumentation included conventional cup-vane anemometers and optical anemometers with spatial averaging over path lengths of 0.6-1 ...

W. M. Porch

1982-09-01T23:59:59.000Z

33

Variability of Surface Air Temperature over Gently Sloped Terrain  

Science Conference Proceedings (OSTI)

Temperature and wind data from a rural micronet and nearby site of the Oklahoma Mesonet are analyzed to study the frequency, strength, and formation processes of cold-pool events in a region with gentle terrain. Spatial analyses were performed ...

David Bodine; Petra M. Klein; Sean C. Arms; Alan Shapiro

2009-06-01T23:59:59.000Z

34

Terrain database interoperability issues in training with distributed interactive simulation  

Science Conference Proceedings (OSTI)

In Distributed Interactive Simulation (DIS), each participating node is responsible for maintaining its own model of the synthetic environment. Problems may arise if significant inconsistencies are allowed to exist between these separate world views, ... Keywords: distributed interactive simulation, terrain databases

Guy A. Schiavone; S. Sureshchandran; Kenneth C. Hardis

1997-07-01T23:59:59.000Z

35

On Computing the Surface Horizontal Pressure Gradient over Elevated Terrain  

Science Conference Proceedings (OSTI)

Methods are proposed for calculating the surface horizontal pressure gradient or geostrophic wind in a local area over elevated terrain from randomly spaced surface observations. These procedures avoid many of the problems associated with sea-...

Maurice Danard

1989-06-01T23:59:59.000Z

36

Computing Hydrostatic Potential Vorticity in Terrain-Following Coordinates  

Science Conference Proceedings (OSTI)

The hydrostatic potential vorticity (HPV) formulated in terrain-following coordinates is reviewed and shown to be equivalent to the widely used HPV formulations in the height, pressure, and isentropic coordinates in the sense that they all ...

Jie Cao; Qin Xu

2011-09-01T23:59:59.000Z

37

Numerical Consistency of Metric Terms in Terrain-Following Coordinates  

Science Conference Proceedings (OSTI)

In numerically integrating the equations of motion in terrain-following coordinates, care must be taken in treating the metric terms that arise due to the sloping coordinate surfaces. In particular, metric terms that appear in the advection and ...

Joseph B. Klemp; William C. Skamarock; Oliver Fuhrer

2003-07-01T23:59:59.000Z

38

On Estimating Dry Deposition Rates in Complex Terrain  

Science Conference Proceedings (OSTI)

In complex terrain, horizontal advection and filtration through a canopy can add substantially to the vertical diffusion component assumed to be the dominant transfer mechanism in conventional deposition velocity formulations. To illustrate this, ...

Bruce B. Hicks

2008-06-01T23:59:59.000Z

39

Classification and modeling of forested terrain using LIDAR sensing  

E-Print Network (OSTI)

To operate autonomously, unmanned ground vehicles (UGVs) must be able to identify the load-bearing surface of the terrain (i.e. the ground) and obstacles. Current sensing techniques work well for structured environments ...

McDaniel, Matthew W

2010-01-01T23:59:59.000Z

40

Improving visual quality of synthetic terrains using weathering simulation on graphics processing unit.  

E-Print Network (OSTI)

??Visual simulation of natural eroded terrains using computer graphics has always been a fascinating research field. While many algorithms have been developed to improve terrain… (more)

Nguyen, Hoang Anh.

2008-01-01T23:59:59.000Z

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


41

Generating color terrain images in an emergency response system  

Science Conference Proceedings (OSTI)

The Atmospheric Release Advisory Capability (ARAC) provides real-time assessments of the consequences resulting from an atmospheric release of radioactive material. In support of this operation, a system has been created which integrates numerical models, data acquisition systems, data analysis techniques, and professional staff. Of particular importance is the rapid generation of graphical images of the terrain surface in the vicinity of the accident site. A terrain data base and an associated acquisition system have been developed that provide the required terrain data. This data is then used as input to a collection of graphics programs which create and display realistic color images of the terrain. The graphics system currently has the capability of generating color shaded relief images from both overhead and perspective viewpoints within minutes. These images serve to quickly familiarize ARAC assessors with the terrain near the release location, and thus permit them to make better informed decisions in modeling the behavior of the released material. 7 refs., 8 figs.

Belles, R.D.

1985-08-01T23:59:59.000Z

42

High-Resolution Aeromagnetic Mapping Of Volcanic Terrain, Yellowstone  

Open Energy Info (EERE)

High-Resolution Aeromagnetic Mapping Of Volcanic Terrain, Yellowstone High-Resolution Aeromagnetic Mapping Of Volcanic Terrain, Yellowstone National Park Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: High-Resolution Aeromagnetic Mapping Of Volcanic Terrain, Yellowstone National Park Details Activities (1) Areas (1) Regions (0) Abstract: High-resolution aeromagnetic data acquired over Yellowstone National Park (YNP) show contrasting patterns reflecting differences in rock composition, types and degree of alteration, and crustal structures that mirror the variable geology of the Yellowstone Plateau. The older, Eocene, Absaroka Volcanic Supergroup, a series of mostly altered, andesitic volcanic and volcaniclastic rocks partially exposed in mountains on the eastern margin of YNP, produces high-amplitude, positive magnetic

43

All-Terrain Vehicle: Non-Road Electric Vehicle Demonstration  

Science Conference Proceedings (OSTI)

An all-terrain vehicle (ATV) is defined by the American National Standards Institute (ANSI) as one that travels on low-pressure tires, with a seat that is straddled by the operator or the operator and one passenger, along with handlebars for steering control. As the name implies, it is designed to handle a wider variety of terrain than most other vehicles. The gasoline-fueled four-wheel drive option is now the most popular type of ATV, with expanding uses in industries such as farming, ranching, and cons...

2009-12-21T23:59:59.000Z

44

Real Time Physically-Based Modeling and Simulation of Cratering and Fragmentation of Terrain  

Science Conference Proceedings (OSTI)

Cratering and fragmentation of terrain due to eXplosions are the behaviors of interest in this effort. We propose a physically-based approach to model the eXplosion event and the process of terrain fragmentation resulting in the formation of craters. ... Keywords: dynamic terrain, eXplosion simulation, physics-based modeling, real time system, simulation, terrain database

Nabil Rami; Michael D. Proctor

2007-12-01T23:59:59.000Z

45

Geolocation of Multiple Targets from Airborne Video Without Terrain Data  

Science Conference Proceedings (OSTI)

The task of geolocating targets from airborne video is required for many applications in surveillance, law enforcement, reconnaissance, etc. The usual approaches to target geolocation involve terrain data, single target tracking, gimbal control of camera ... Keywords: Geolocation, IMU-Camera calibration, Tracking, Unmanned aerial vehicle

Kyung Min Han; Guilherme N. Desouza

2011-04-01T23:59:59.000Z

46

PRODUCING SATELLITE-DERIVED IRRADIANCES IN COMPLEX ARID TERRAIN  

Open Energy Info (EERE)

ASES 2003, Austin TX and submitted for publication in Solar Energy ASES 2003, Austin TX and submitted for publication in Solar Energy PRODUCING SATELLITE-DERIVED IRRADIANCES IN COMPLEX ARID TERRAIN Richard Perez & Marek Kmiecik ASRC, the University at Albany 251 Fuller Rd. Albany, NY 12203 perez@asrc.cestm.albany.edu Pierre Ineichen, CUEPE, University of Geneva 7 Route de Drize 1227 Carouge, Switzerland Pierre.Ineichen@cuepe.unige.ch Marek Kmiecik, ASRC Kathleen Moore, IED 251 Fuller Rd. Albany, NY 12203 moore@iedat.com David Renne & Ray George NREL 1617 Cole Blvd. Golden, CO 80401 drenne / ray_george@nrel.nrel.gov ABSTRACT This paper describes a methodology to correct satellite- derived irradiances over complex terrain. The correction applies to satellite models using visible images from geostationary satellites. 1. DESCRIPTION OF CURRENT MODEL

47

All-Terrain Vehicle: Non-Road Electric Vehicle Demonstration  

Science Conference Proceedings (OSTI)

An all-terrain vehicle (ATV) is defined by the American National Standards Institute (ANSI) as one that travels on low-pressure tires, with a seat that is straddled by the operator or the operator and one passenger, along with handlebars for steering control. Most ATVs are gas powered, but replacement of gas-powered ATVs with an electric equivalent could reduce emissions output, fuel consumption, and other petrochemical byproducts resulting from operation of these vehicles. An electric ATV offers all of ...

2010-12-31T23:59:59.000Z

48

Atmospheric transport in complex terrain at Los Alamos, Area G  

Science Conference Proceedings (OSTI)

This report documents the atmospheric dispersion used in the Area G Performance Assessment for off-site airborne dose calculations. Potential airborne contaminants from the mesa top disposal facility disperse in the complex terrain dominated by narrow mesas in parallel to narrow canyons. The dispersion is characterized by site-specific values of X/Q [(Ci/m{sup 3})/(Ci/s)] at each of two designated receptor locations, a {open_quote}maximum off-site dose{close_quote} location and a nearby population center (White Rock, NM). The values of X/Q in each of the sixteen wind sectors are first estimated with the CAP-88 computer code using 1992 annual meteorologic data from Area G and assuming an area source for release. This data captures the dominant wind direction on the mesa tops from the SSW. These dispersion parameters are assumed to apply to open, flat terrain and must be corrected for the complex mesa and canyon terrain terrain surrounding the Area G site. Additional meteorologic data has been collected over two years from six remote temporary meteorological stations operated on the mesas and in the canyons immediately around Area G. These data indicate that the wind flow in the canyons is exclusively bimodel, flowing up canyon during the day and down canyon at night. It is conservatively assumed that all ground level releases from Area G which blow out across an adjacent canyon become entrained in the canyon flow. This effectively combines the contaminant release for several sectors into a single canyon flow which is upstream during the day or downstream at night. This canyon channeling mechanism is implemented in the model by summing the wind sector dispersion factors over those sectors appropriate to the geometry for a release from Area G toward either adjacent canyon.

Vold, E.L.

1997-03-01T23:59:59.000Z

49

Multiscale Evaluation of the Improvements in Surface Snow Simulation through Terrain Adjustments to Radiation  

Science Conference Proceedings (OSTI)

The downwelling shortwave radiation on the earth’s land surface is affected by the terrain characteristics of slope and aspect. These adjustments, in turn, impact the evolution of snow over such terrain. This article presents a multiscale ...

Sujay V. Kumar; Christa D. Peters-Lidard; David Mocko; Yudong Tian

2013-02-01T23:59:59.000Z

50

Exploring the Possible Role of Small-Scale Terrain Drag on Stable Boundary Layers over Land  

Science Conference Proceedings (OSTI)

This paper addresses the possible role of unresolved terrain drag, relative to the turbulent drag on the development of the stable atmospheric boundary layer over land. Adding a first-order estimate for terrain drag to the turbulent drag appears ...

G. J. Steeneveld; A. A. M. Holtslag; C. J. Nappo; B. J. H. van de Wiel; L. Mahrt

2008-10-01T23:59:59.000Z

51

Plume Dispersion Anomalies in a Nocturnal Urban Boundary Layer in Complex Terrain  

Science Conference Proceedings (OSTI)

The URBAN 2000 experiments were conducted in the complex urban and topographical terrain in Salt Lake City, Utah, in stable nighttime conditions. Unexpected plume dispersion often arose because of the interaction of complex terrain and mountain–...

Dennis Finn; Kirk L. Clawson; Roger G. Carter; Jason D. Rich; K. Jerry Allwine

2008-11-01T23:59:59.000Z

52

On-the-Fly Decompression and Rendering of Multiresolution Terrain  

SciTech Connect

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.

Lindstrom, P; Cohen, J D

2009-04-02T23:59:59.000Z

53

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

Science Conference Proceedings (OSTI)

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.

Orgill, M.M.

1981-02-01T23:59:59.000Z

54

Multilinguisme, variation, contact. Des pratiques langagières sur le terrain à l'analyse de corpus hétérogènes.  

E-Print Network (OSTI)

??Ce mémoire de synthèse présente un premier chapitre de positionnements épistémologiques (pratiques langagières, construction des objets, des données et des corpus, linguistique de terrain impliquée,… (more)

Léglise, Isabelle

2013-01-01T23:59:59.000Z

55

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

Science Conference Proceedings (OSTI)

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.

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

1993-06-01T23:59:59.000Z

56

An augmented reality system for military operations in urban terrain  

E-Print Network (OSTI)

Many future military operations are expected to occur in urban environments. These complex, 3D battlefields introduce many challenges to the dismounted warfighter. Better situational awareness is required for effective operation in urban environments. However, delivering this information to the dismounted warfighter is extremely difficult. For example, maps draw a user's attention away from the environment and cannot directly represent the three-dimensional nature of the terrain. To overcome these difficulties, we are developing the Battlefield Augmented Reality System (BARS). The system consists of a wearable computer, a wireless network system, and a tracked see-through head-mounted display (HMD). The computer generates graphics that, from the user's perspective, appear to be aligned with the actual environment. For example, a building could be augmented to show its name, a plan of its interior, icons to represent reported sniper locations, and the names of adjacent streets. This paper surveys the current state of development of BARS and describes ongoing research efforts. We describe four major research areas. The first is the development of an effective, efficient user interface for displaying data and processing user inputs. The second is the capability for collaboration between multiple BARS users and other systems. Third, we describe the current hardware for both a mobile and indoor prototype system. Finally, we

Mark A. Livingston; Mark A. Livingston; Lawrence J. Rosenblum; Simon J. Julier; Dennis Brown; Yohan Baillot; J. Edward; Swan Ii; Joseph L. Gabbard; Deborah Hix

2002-01-01T23:59:59.000Z

57

Terrain modeling with multifractional Brownian motion and self-regulating processes  

Science Conference Proceedings (OSTI)

Approximate scale-invariance and local regularity properties of natural terrains suggest that they can be a accurately modeled with random processes which are locally fractal. Current models for terrain modeling include fractional and multifractional ... Keywords: (multifractional)brownian motion, digital elevation models, hölderian regularity

Antoine Echelard; Jacques Lévy Véhel; Olivier Barrière

2010-09-01T23:59:59.000Z

58

Rapid gravity and gravity gradiometry terrain corrections via an adaptive quadtree mesh discretization  

E-Print Network (OSTI)

Rapid gravity and gravity gradiometry terrain corrections via an adaptive quadtree mesh discretization Kristofer Davis1,2 M. Andy Kass1 Yaoguo Li1 1 Center for Gravity, Electrical, and Magnetic Studies of gravity gradiometry surveys utilising an adaptive quadtree mesh discretization. The data- and terrain

59

A Model for Objective Simulation of Boundary-Layer Winds in an Area of Complex Terrain  

Science Conference Proceedings (OSTI)

An objective analysis model is formulated to simulate the boundary-layer wind field in an area of complex terrain on the island of Oahu, Hawaii. The model is designed to reproduce the effects of the terrain on the undisturbed trade wind flow in ...

D. André Erasmus

1986-12-01T23:59:59.000Z

60

Optimization of scale and parametrization for terrain segmentation: An application to soil-landscape modeling  

Science Conference Proceedings (OSTI)

This paper presents a procedure to optimize parametrization and scale for terrain-based environmental modeling. The workflow was exemplified on crop yield data, which is assumed to represent a proxy for soil productivity. Focal mean statistics were used ... Keywords: Curvature, Focal mean statistics, OBIA, Regression, Soil productivity., Terrain segmentation

Lucian Drgu; Thomas Schauppenlehner; Andreas Muhar; Josef Strobl; Thomas Blaschke

2009-09-01T23:59:59.000Z

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


61

I/o-efficient efficient algorithms for computing contours on a terrain  

Science Conference Proceedings (OSTI)

A terrain M is the graph of a bivariate function. We assume that M is represented as a triangulated surface with N vertices. A contour (or isoline) of M is a connected component of a level set of M. Generically, each contour is a closed ... Keywords: contours, geographical information systems, i/o-efficient algorithms, terrains

Pankaj K. Agarwal; Lars Arge; Thomas Mølhave; Bardia Sadri

2008-06-01T23:59:59.000Z

62

Minimalistic Control of a Compass Gait Robot in Rough Terrain  

E-Print Network (OSTI)

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 ...

Iida, Fumiya

63

Observations of a Terrain-Forced Mesoscale Vortex and Canyon Drainage Flows along the Front Range of Colorado  

Science Conference Proceedings (OSTI)

Observations taken during the February 1991 Atmospheric Studies in Complex Terrain (ASCOT) Winter Validation Study are used to describe the wind field associated with a terrain-forced mesoscale vortex and thermally forced canyon drainage flows ...

David H. Levinson; Robert M. Banta

1995-07-01T23:59:59.000Z

64

Producing Satellite-Derived Irradiances in Complex Arid Terrain | OpenEI  

Open Energy Info (EERE)

Producing Satellite-Derived Irradiances in Complex Arid Terrain Producing Satellite-Derived Irradiances in Complex Arid Terrain Dataset Summary Description (Abstract): This paper describes a methodology to correct satellite-derived irradiances over complex terrain. The correction applies to satellite models using visible images from geostationary satellites. (Purpose): Solar model documentation Source SUNY Albany Date Released June 26th, 2003 (11 years ago) Date Updated August 29th, 2003 (11 years ago) Keywords methodology solar SWERA UNEP validation Data application/pdf icon Download Report (pdf, 690.1 KiB) Quality Metrics Level of Review Some Review Comment Temporal and Spatial Coverage Frequency Time Period 1999 - 2002 License License Other or unspecified, see optional comment below Comment Please cite publication as follows: Perez, R., Ineichen, P., Moore, K., Kmiecik, M., Renné, D., and George, R. 2002.Producing Satellite-Derived Irradiances in Complex Arid Terrain. ASES 2003, Austin TX and submitted for publication in Solar Energy

65

A Simple Method for Spatial Interpolation of the Wind in Complex Terrain  

Science Conference Proceedings (OSTI)

The topographical elevation difference is proposed as a new variable for spatial interpolation of the sparse surface wind measurements to a finer mesh in a complex terrain area. The most used method for the initialization of diagnostic wind field ...

I. Palomino; F. Martín

1995-07-01T23:59:59.000Z

66

Terrain-Induced Turbulence over Lantau Island: 7 June 1994 Tropical Storm Russ Case Study  

Science Conference Proceedings (OSTI)

Numerical simulations of terrain-induced turbulence associated with airflow over Lantau Island of Hong Kong are presented. Lantau is a relatively small island with three narrow peaks rising to between 700 and 950 m above mean sea level. This ...

Terry L. Clark; Teddie Keller; Janice Coen; Peter Neilley; Hsiao-ming Hsu; William D. Hall

1997-07-01T23:59:59.000Z

67

Gravity Wave Breaking over the Central Alps: Role of Complex Terrain  

Science Conference Proceedings (OSTI)

The characteristics of gravity waves excited by the complex terrain of the central Alps during the intensive observational period (IOP) 8 of the Mesoscale Alpine Programme (MAP) is studied through the analysis of aircraft in situ measurements, ...

Qingfang Jiang; James D. Doyle

2004-09-01T23:59:59.000Z

68

Geolocation of man-made reservoirs across terrains of varying complexity using GIS  

Science Conference Proceedings (OSTI)

The Reservoir Sedimentation Survey Information System (RESIS) is one of the world's most comprehensive databases of reservoir sedimentation rates, comprising nearly 6000 surveys for 1819 reservoirs across the continental United States. Sediment surveys ... Keywords: DEM, GIS, Reservoir sedimentation, Terrain complexity

David M. Mixon; David A. Kinner; Robert F. Stallard; James P. M. Syvitski

2008-10-01T23:59:59.000Z

69

Transferability of a Three-Dimensional Air Quality Model between Two Different Sites in Complex Terrain  

Science Conference Proceedings (OSTI)

The three-dimensional, diagnostic, particle-in-cell transport and diffusion model MATHEW/ADPIC is used to test its transferability from one site in complex terrain to another with different characteristics, under stable nighttime drainage flow ...

Rolf Lange

1989-07-01T23:59:59.000Z

70

An Investigation of Terrain Effects on the Mesoscale Spectrum of Atmospheric Motions  

Science Conference Proceedings (OSTI)

Wind and temperature data collected on commercial aircraft during the Global Atmospheric Sampling Program (GASP) are used to investigate the effects of underlying terrain on mesoscale variability, and the observational results are interpreted ...

G. D. Nastrom; D. C. Fritts; K. S. Gage

1987-10-01T23:59:59.000Z

71

An Examination of Residual Wind Fluctuations Observed at 10 m over Flat Terrain  

Science Conference Proceedings (OSTI)

This study investigates the behavior of wind fluctuations observed at the 10-m level over a flat terrain site located some 100 km east of the Rocky Mountains. The purposes were to assess residual fluctuations in order to ascertain effects ...

D. M. Leahey; M. C. Hansen; M. B. Schroeder

1996-01-01T23:59:59.000Z

72

Numerical Study of Terrain-Induced Mesoscale Motions in a Mixed Layer  

Science Conference Proceedings (OSTI)

Numerical integrations using a potential enstrophy conserving scheme are presented for the flow within a mixed layer over hilly terrain using the hydrostatic shallow-water equations with a quadratic drag law. The mesoscale area treated is 150 km ...

Y-J. Han; K. Ueyoshi; J. W. Deardorff

1982-11-01T23:59:59.000Z

73

Lidar Descriptions of Mixing-Layer Thickness Characteristics in a Complex Terrain/Coastal Environment  

Science Conference Proceedings (OSTI)

Airborne lidar and supplementary measurements made during a major study of air chemistry in southern California (SCCCAMP 1985) provided a rare opportunity to examine atmospheric boundary-layer structure in a coastal area with complex terrain. ...

James L. McElroy; Ted B. Smith

1991-05-01T23:59:59.000Z

74

Orographic Clouds in Terrain-Blocked Flows: An Idealized Modeling Study  

Science Conference Proceedings (OSTI)

Idealized numerical simulations of moist strongly stratified flow over topography are used to study the processes that control orographic clouds in terrain-blocked flows as a joint function of the nondimensional flow parameter Nh/U, the ...

Joseph Galewsky

2008-11-01T23:59:59.000Z

75

On the Ability of the WRF Model to Reproduce the Surface Wind Direction over Complex Terrain  

Science Conference Proceedings (OSTI)

The ability of the Weather Research and Forecasting (WRF) model to reproduce the surface wind direction over complex terrain is examined. A simulation spanning a winter season at a high horizontal resolution of 2 km is compared with wind direction ...

Pedro A. Jiménez; Jimy Dudhia

2013-07-01T23:59:59.000Z

76

Average Diurnal Behavior of Surface Winds during Summer at Sites in Complex Terrain  

Science Conference Proceedings (OSTI)

Mean diurnal wind distributions from five surface stations in the rugged Geysers area of northern California were examined to determine how they were affected by the terrain. The one dimensional slope-flow model of Garrett was able to simulate ...

Alfred J. Garrett; Frank G. Smith III

1985-02-01T23:59:59.000Z

77

Radiosity Approach for the Shortwave Surface Radiation Balance in Complex Terrain  

Science Conference Proceedings (OSTI)

The influence of topography on the radiation balance in complex terrain has so far been investigated either with very simple or very sophisticated approaches that are limited, respectively, by an uncontrolled spatial representation of radiative ...

Nora Helbig; Henning Löwe; Michael Lehning

2009-09-01T23:59:59.000Z

78

Accurate Wind Characterization in Complex Terrain Using the Immersed Boundary Method  

DOE Green Energy (OSTI)

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.

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

2009-09-30T23:59:59.000Z

79

Mesoscale Boundary Layer Evolution over Complex Terrain. Part I. Numerical Simulation of the Diurnal Cycle  

Science Conference Proceedings (OSTI)

The continuous development of a meso-?-scale boundary layer over sloping terrain upwind of a high mountain barrier was simulated through a complete diurnal cycle using a nonhydrostatic boundary-layer model. The simulation detailed the evolution ...

David C. Bader; Thomas B. McKee; Gregory J. Tripoli

1987-10-01T23:59:59.000Z

80

Mesoscale Modeling and Four-Dimensional Data Assimilation in Areas of Highly Complex Terrain  

Science Conference Proceedings (OSTI)

A multiscale four-dimensional data assimilation (FDDA) technique, based on Newtonian relaxation, is incorporated into a mesoscale model and evaluated using meteorological and tracer data collected during the Atmospheric Studies in Complex Terrain ...

J. D. Fast

1995-12-01T23:59:59.000Z

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


81

The Principles of Laboratory Modeling of Stratified Atmospheric Flows over Complex Terrain  

Science Conference Proceedings (OSTI)

Laboratory modeling provides a reasonably quick and relatively inexpensive method for investigating stratified air Row around mesoscale topography. Quantitative results for stratified flow over complex terrain may be obtained from suitably ...

Peter G. Baines; Peter C. Manins

1989-11-01T23:59:59.000Z

82

Regional-Scale Flows in Mountainous Terrain. Part II: Simplified Numerical Experiments  

Science Conference Proceedings (OSTI)

A series of two- and three-dimensional idealized numerical experiments are conducted to examine the effects of different physical processes upon the development of the thermally driven regional-scale circulations over mountainous terrain ...

James E. Bossert; William R. Cotton

1994-07-01T23:59:59.000Z

83

Three-Dimensional Numerical Model Simulations of Airflow Over Mountainous Terrain: A Comparison with Observations  

Science Conference Proceedings (OSTI)

Numerical simulations of airflow over two different choices of mountainous terrain and the comparisons of results with aircraft observations are presented. Two wintertime casts for flow over Elk Mountain, Wyoming where surface heating is assumed ...

Terry L. Clark; Robert Gall

1982-07-01T23:59:59.000Z

84

Spatial Interpolation of Meteorological Data in Complex Terrain Using Temporal Statistics  

Science Conference Proceedings (OSTI)

Diagnostic wind field numerical models have significant difficulty developing representative wind velocities in complex terrain. A large of this difficulty begins with the initial wind field interpolation. If this interpolated wind field does not ...

William Porch; Daniel Rodriguez

1987-12-01T23:59:59.000Z

85

A Forward-in-Time Anelastic Nonhydrostatic Model in a Terrain-Following Coordinate  

Science Conference Proceedings (OSTI)

A three-dimensional (3D) forward-in-time anelastic nonhydrostatic model in a terrain-following coordinate is developed to investigate mesoscale circulations over topography. The anelastic nonhydrostatic model utilizes the deep-continuity equation,...

Ching-Yuang Huang

2000-07-01T23:59:59.000Z

86

An Analysis of Wind Direction and Horizontal Wind Component Fluctuations over Complex Terrain  

Science Conference Proceedings (OSTI)

Based on an extensive wind dataset over complex terrain, the commonly used small-angle approximation ?v ? ??V is studied and found to overestimate over all wind speeds and ?? values observed. This should be anticipated due to the assumptions ...

K. H. Papadopoulos; C. G. Helmis; G. T. Amanatidis

1992-09-01T23:59:59.000Z

87

Implications of Small-Scale Flow Features to Modeling Dispersion over Complex Terrain  

Science Conference Proceedings (OSTI)

Small-scale, topographically forced wind systems often have a strong influence on flow over complex terrain. A problem is that these systems are very difficult to measure, because of their limited spatial and temporal extent. They can be ...

R. M. Banta; L. D. Olivier; P. H. Gudiksen; R. Lange

1996-03-01T23:59:59.000Z

88

Impact of Environmental Variations on Simulated Squall Lines Interacting with Terrain  

Science Conference Proceedings (OSTI)

The complex evolution of convective systems crossing (or attempting to cross) mountainous terrain represents a substantial forecasting challenge. This study examines the processes associated with environments of “crossing” squall lines (which were ...

Casey E. Letkewicz; Matthew D. Parker

2011-10-01T23:59:59.000Z

89

QNH: Mesoscale Bounded Derivative Initialization and Winter Storm Test over Complex Terrain  

Science Conference Proceedings (OSTI)

Mesoscale bounded derivative initialization (BDI) is utilized to derive dynamical constraints, from which elliptic equations are formulated to derive smooth initial fields over complex terrain for mesoscale models. The initialization is ...

J. L. Lee; A. E. MacDonald

2000-04-01T23:59:59.000Z

90

An implementation of terrain geomorphing in the vertex shader for synthetic planetary surfaces  

E-Print Network (OSTI)

The purpose of this research is to develop the three-dimensional models of planetary surfaces which can be used in the test environments for the Vision-Based Navigation Systems' (VBNS) terrain recognition and navigation ...

Colagiovanni, Lawrence W. (Lawrence William)

2008-01-01T23:59:59.000Z

91

Geostatistical Mapping of Precipitation from Rain Gauge Data Using Atmospheric and Terrain Characteristics  

Science Conference Proceedings (OSTI)

A geostatistical framework for integrating lower-atmosphere state variables and terrain characteristics into the spatial interpolation of rainfall is presented. Lower-atmosphere state variables considered are specific humidity and wind, derived ...

Phaedon C. Kyriakidis; Jinwon Kim; Norman L. Miller

2001-11-01T23:59:59.000Z

92

Spatial Snow Modeling of Wind-Redistributed Snow Using Terrain-Based Parameters  

Science Conference Proceedings (OSTI)

Wind is widely recognized as one of the dominant controls of snow accumulation and distribution in exposed alpine regions. Complex and highly variable wind fields in rugged terrain lead to similarly complex snow distribution fields with areas of ...

Adam Winstral; Kelly Elder; Robert E. Davis

2002-10-01T23:59:59.000Z

93

Relationship of Synoptic Winds and Complex Terrain Flows during the MISTRAL Field Experiment  

Science Conference Proceedings (OSTI)

The relationship between the surface and synoptic wind direction is examined climatologically in a complex terrain region. Surface winds were observed over a 1-yr period during the MISTRAL project in the Basel, Switzerland, area. The measurement ...

Rudolf O. Weber; Pirmin Kaufmann

1998-11-01T23:59:59.000Z

94

Diagnostic Wind Field Modeling for Complex Terrain: Model Development and Testing  

Science Conference Proceedings (OSTI)

A three dimensional diagnostic wind field model is shown to be capable of generating potential flow solutions associated with simple terrain features. This is achieved by modifying an initially uniform background wind to make the flow divergence ...

D. G. Ross; I. N. Smith; P. C. Manins; D. G. Fox

1988-07-01T23:59:59.000Z

95

Verification of Mesoscale Numerical Weather Forecasts in Mountainous Terrain for Application to Avalanche Prediction  

Science Conference Proceedings (OSTI)

Two high-resolution, real-time, numerical weather prediction (NWP) models are verified against case study observations to quantify their accuracy and skill in the mountainous terrain of western Canada. These models, run daily at the University of ...

Claudia Roeger; Roland Stull; David McClung; Joshua Hacker; Xingxiu Deng; Henryk Modzelewski

2003-12-01T23:59:59.000Z

96

The Energy Budget of Canadian Shield Subarctic Terrain and Its Impact on Hillslope Hydrological Processes  

Science Conference Proceedings (OSTI)

The objective of the study is to determine the local processes that control the partitioning of the energy budget of shield terrain in the western Canadian subarctic. The magnitude of the spring snowmelt and its potential to flood exposed bedrock ...

Christopher Spence; Wayne R. Rouse

2002-04-01T23:59:59.000Z

97

Sensitivities of Orographic Precipitation to Terrain Geometry and Upstream Conditions in Idealized Simulations  

Science Conference Proceedings (OSTI)

This study examines how variations in relatively simple terrain geometries influence orographic precipitation and its spatial patterns of sensitivity to small changes in upstream conditions. An idealized three-dimensional model is used to simulate ...

Campbell D. Watson; Todd P. Lane

2012-04-01T23:59:59.000Z

98

Near-Real-Time Applications of a Mesoscale Analysis System to Complex Terrain  

Science Conference Proceedings (OSTI)

Several mesoscale data analysis systems are reviewed, of which one is then adapted and applied to the complex terrain of northwest Utah and the western United States. The analysis system relies on the simple, but computationally efficient, ...

Steven M. Lazarus; Carol M. Ciliberti; John D. Horel; Keith A. Brewster

2002-10-01T23:59:59.000Z

99

Geostatistical Mapping of Mountain Precipitation Incorporating Autosearched Effects of Terrain and Climatic Characteristics  

Science Conference Proceedings (OSTI)

Hydrologic and ecologic studies in mountainous terrain are sensitive to the temporal and spatial distribution of precipitation. In this study a geostatistical model, Auto-Searched Orographic and Atmospheric Effects Detrended Kriging (ASOADeK), is ...

Huade Guan; John L. Wilson; Oleg Makhnin

2005-12-01T23:59:59.000Z

100

A Mesoscale Analysis Method for Surface Potential Temperature in Mountainous and Coastal Terrain  

Science Conference Proceedings (OSTI)

A technique is developed to anisotropically spread surface observations in steep valleys. The goal is to create an improved objective analysis for the lowest, terrain-following numerical weather prediction (NWP) model level in mountainous ...

Xingxiu Deng; Roland Stull

2005-02-01T23:59:59.000Z

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


101

A Simple Model for Correcting Sodar and Lidar Errors in Complex Terrain  

Science Conference Proceedings (OSTI)

Ground-based sensing of wind profiles by sodars and lidars is becoming the standard for wind energy and other applications. However, there remain difficulties in complex terrain since the instruments sense wind components in spatially separated ...

Stuart Bradley

2012-12-01T23:59:59.000Z

102

Airborne Doppler Lidar Measurements of Valley Flows in Complex Coastal Terrain  

Science Conference Proceedings (OSTI)

Three-dimensional winds obtained with an airborne Doppler lidar are used to investigate the spatial structure of topographically driven flows in complex coastal terrain in Southern California. The airborne Doppler lidar collected four hours of ...

S. F. J. De Wekker; K. S. Godwin; G. D. Emmitt; S. Greco

2012-08-01T23:59:59.000Z

103

Applicability of digital terrain analyses to wind energy prospecting and siting  

DOE Green Energy (OSTI)

The recent publication of the Digital Elevation Model (DEM) database by the US Geological Survey (USGS) has provided a unique opportunity for the development of cost-effective wind energy prospecting technology. This database contains terrain elevation values on a Latitude-Longitude grid with a resolution of 3 arc-seconds (about 90 m) for the contiguous United States, Hawaii, and Puerto Rico. This database has been coupled with software that will produce shaded-relief maps on a laser printer in a format compatible with the state wind power maps in the US wind energy atlas. By providing a much higher resolution of the terrain features than was possible when the US atlas was prepared, these maps can be useful in general wind prospecting activities. As highly resolved as the 90-m DEM data seem to be when compared to the atlas grid, they still appear to be too coarse to resolve terrain features in the detail required for local wind flow characterization and wind plant layout. Gridded terrain data at about 10-m resolution are available from the USGS for some areas of the United States. In areas where these data are unavailable, they may be generated by digitizing and gridding the contours from a 1:24,000-scale USGS map over the area of interest. Comparisons of terrain profiles from cross sections of the 10-m and 90-m data provide an indication of the effect of resolution on the reliability of terrain feature representation. Oblique views of the terrain in shaded-relief format provide a dramatic enhancement of the shape and relative position of features of interest.

Wendell, L.L.; Gower, G.L.; Birn, M.B. [Pacific Northwest Lab., Richland, WA (United States); Castellano, C.C. [USDOE, Washington, DC (United States)

1993-07-01T23:59:59.000Z

104

A High-Resolution Air Pollution Model Suitable for Dispersion Studies in Complex Terrain  

Science Conference Proceedings (OSTI)

The development of an air pollution transport model that uses an expanding terrain-following coordinate with high resolution in analytic form near the surface and a high-order accurate transport algorithm is described. The model is designed to be ...

Ming Liu; John J. Carroll

1996-10-01T23:59:59.000Z

105

Modeling of Summertime Flow and Dispersion in the Coastal Terrain of Southeastern Australia  

Science Conference Proceedings (OSTI)

The Latrobe Valley is situated in a coastal region of complex terrain in southeastern Australia. During typical summertime conditions of light synoptic winds and clear skies, the low-level regional wind field is dominated by sea-breeze and slope-...

William L. Physick; Deborah J. Abbs

1991-04-01T23:59:59.000Z

106

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

E-Print Network (OSTI)

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

Hu, Hui

107

Procedural Reproduction of Terrain Textures with Geographic Data Carsten Dachsbacher1,3  

E-Print Network (OSTI)

. As a consequence the native instructions of a GPU's pixel shader allow a very simple imple- mentation. The procedural model is imple- mented as vertex and fragment shaders and entirely executed on graphics hardware Textures for Terrain Rendering. In Shader X4 (2005), Charles River Media. [Fai05] FAIRCLOUGH M.: Terragen v

Bolch, Tobias

108

Dynamical Downscaling of Wind Speed in Complex Terrain Prone To Bora-Type Flows  

Science Conference Proceedings (OSTI)

The results of numerically modeled wind speed climate, a primary component of wind energy resource assessment in the complex terrain of Croatia, are given. For that purpose, dynamical downscaling of 10 yr (1992–2001) of the 40-yr ECMWF Re-Analysis ...

Kristian Horvath; Alica Baji?; Stjepan Ivatek-Šahdan

2011-08-01T23:59:59.000Z

109

On the Laws of Geostrophic Drag and Heat Transfer over a Slightly Inclined Terrain  

Science Conference Proceedings (OSTI)

Analytical solutions of a set of equations that couples the Ekman boundary layer and the Prandtl slope wind equations are presented for terrain inclinations with an upper limit of 0.2. With the aid of the logarithmic asymptotes for wind and ...

Lev N. Gutman; JoséW. Melgarejo

1981-08-01T23:59:59.000Z

110

A Flash-Flooding Storm at the Steep Edge of High Terrain: Disaster in the Himalayas  

Science Conference Proceedings (OSTI)

Flash floods on the edge of high terrain, such as the Himalayas or Rocky Mountains, are especially dangerous and hard to predict. The Leh flood of 2010 at the edge of the Himalayan Plateau in India is an example of the tragic consequences of such storms. ...

Kristen L. Rasmussen; Robert A. Houze Jr.

2012-11-01T23:59:59.000Z

111

Electric Utility Terrain Vehicle Demonstration at a Military Base in Florida  

Science Conference Proceedings (OSTI)

Non-road electric vehicles such as lift trucks, airport ground support equipment and underground mining vehicles have proven themselves in the marketplace. However, heavy-duty utility-terrain vehicles (UTVs) powered exclusively by electricity have been introduced only recently. To test the capabilities of electric UTVs, two demonstration vehicles were instrumented for data acquisition and placed in ...

2013-07-31T23:59:59.000Z

112

Sink placement on a 3D terrain for border surveillance in wireless sensor networks  

Science Conference Proceedings (OSTI)

With their distributed nature and redundant operation capability, wireless sensor networks are very suitable for border surveillance scenarios that track intruders trying to breach to a safe side. In such scenarios, keeping the operation going on for ... Keywords: Border surveillance, Discrete event simulation, Genetic algorithms, Sink placement, Three dimensional terrain, Wireless sensor networks

Rabun Kosar; Cem Ersoy

2012-02-01T23:59:59.000Z

113

Visual Terrain Mapping for Mars Exploration1,2 0-7803-8155-6/04/$17.00 2004 IEEE  

E-Print Network (OSTI)

1 Visual Terrain Mapping for Mars Exploration1,2 1 0-7803-8155-6/04/$17.00© 2004 IEEE 2 IEEEAC. The techniques used include wide-baseline stereo mapping for terrain distant from the rover, bundle adjustment images. However, current rover technologies do not allow rovers to autonomously navigate to distant

Li, Rongxing Â?RonÂ?

114

The Influence of Groundwater Flow on Thermal Regimes in Mountainous Terrain  

DOE Green Energy (OSTI)

Active circulation of cool groundwater in mountainous terrain can cause an advective disturbance of the thermal regime. This factor complicates interpretation of data collected in geothermal exploration programs. An isothermal free-surface model has been developed which provides qualitative insight into the nature of an advective disturbance as it is affected by topography, permeability and climate. A fully coupled model of fluid and heat transfer is being developed for quantitative study of idealized mountain hydrothermal systems.

Forster, Craig; Smith, Leslie

1986-01-21T23:59:59.000Z

115

Surface Energy Balance of the Western and Central Canadian Subarctic: Variations in the Energy Balance among Five Major Terrain Types  

Science Conference Proceedings (OSTI)

In this study, the surface energy balance of 10 sites in the western and central Canadian subarctic is examined. Each research site is classified into one of five terrain types (lake, wetland, shrub tundra, upland tundra, and coniferous forest) ...

Andrea K. Eaton; Wayne R. Rouse; Peter M. Lafleur; Philip Marsh; Peter D. Blanken

2001-09-01T23:59:59.000Z

116

Analysis of WRF Model Wind Estimate Sensitivity to Physics Parameterization Choice and Terrain Representation in Andalusia (Southern Spain)  

Science Conference Proceedings (OSTI)

This paper reports on an evaluation of the relative roles of choice of parameterization scheme and terrain representation in the Weather Research and Forecasting (WRF) mesoscale model, in the context of a regional wind resource assessment. As a ...

F. J. Santos-Alamillos; D. Pozo-Vázquez; J. A. Ruiz-Arias; V. Lara-Fanego; J. Tovar-Pescador

2013-07-01T23:59:59.000Z

117

Radar-Based Quantitative Precipitation Estimation for the Cool Season in Complex Terrain: Case Studies from the NOAA Hydrometeorology Testbed  

Science Conference Proceedings (OSTI)

This study explores error sources of the National Weather Service operational radar-based quantitative precipitation estimation (QPE) during the cool season over the complex terrain of the western United States. A new, operationally geared radar ...

Jian Zhang; Youcun Qi; David Kingsmill; Kenneth Howard

2012-12-01T23:59:59.000Z

118

Isobaric Height Perturbations Associated with Mountain Waves Measured by Aircraft during the Terrain-Induced Rotor Experiment  

Science Conference Proceedings (OSTI)

It has only been in the last few years that accurate measurement of the horizontal pressure gradient has been possible over complex terrain using an airborne platform. To infer forcing mechanisms for the wind, an independent measure of the height ...

Thomas R. Parish; Larry D. Oolman

2012-12-01T23:59:59.000Z

119

An Intense, Quasi-Steady Thunderstorm over Mountainous Terrain. Part II: Doppler Radar Observations of the Storm Morphological Structure  

Science Conference Proceedings (OSTI)

An analysis of an intense, quasi-steady thunderstorm which developed over mountainous terrain is presented. This storm, extensively analyzed using multiple Doppler radar and surface mesonet data, formed within an environment having strong low-...

Kevin R. Knupp; William R. Cotton

1982-02-01T23:59:59.000Z

120

Examination of Errors in Near-Surface Temperature and Wind from WRF Numerical Simulations in Regions of Complex Terrain  

Science Conference Proceedings (OSTI)

The performance of an advanced research version of the Weather Research and Forecasting Model (WRF) in predicting near-surface atmospheric temperature and wind conditions under various terrain and weather regimes is examined. Verification of 2-m ...

Hailing Zhang; Zhaoxia Pu; Xuebo Zhang

2013-06-01T23:59:59.000Z

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


121

Evaluation of Turbulence Closure Models for Large-Eddy Simulation over Complex Terrain: Flow over Askervein Hill  

Science Conference Proceedings (OSTI)

The evaluation of turbulence closure models for large-eddy simulation (LES) has primarily been performed over flat terrain, where comparisons with theory and observations are simplified. The authors have previously developed improved closure ...

Fotini Katopodes Chow; Robert L. Street

2009-05-01T23:59:59.000Z

122

A Model Study of the Stably Stratified Steady-State Atmospheric Boundary Layer over a Slightly Inclined Terrain  

Science Conference Proceedings (OSTI)

A simple, steady-state, numerical model is used to examine the Rossby-number similarity theory of the atmospheric boundary layer over a slightly inclined terrain. The model confirms the similarity predictions. The slope-influenced universal ...

Zbigniew Sorbjan

1984-06-01T23:59:59.000Z

123

An Immersed Boundary Method Enabling Large-Eddy Simulations of Flow over Complex Terrain in the WRF Model  

Science Conference Proceedings (OSTI)

This paper describes a three-dimensional immersed boundary method (IBM) that facilitates the explicit resolution of complex terrain within the Weather Research and Forecasting (WRF) model. Two interpolation methods—trilinear and inverse distance ...

Katherine A. Lundquist; Fotini Katopodes Chow; Julie K. Lundquist

2012-12-01T23:59:59.000Z

124

A Method for Imposing Surface Stress and Heat Flux Conditions in Finite-Difference Models with Steep Terrain  

Science Conference Proceedings (OSTI)

A numerical implementation of the surface stress boundary condition is presented for finite-difference models in which the terrain slope and curvature cannot necessarily be considered small. The method involves reducing the discretized stress ...

C. C. Epifanio

2007-03-01T23:59:59.000Z

125

High-Resolution Large-Eddy Simulations of Scalar Transport in Atmospheric Boundary Layer Flow over Complex Terrain  

Science Conference Proceedings (OSTI)

This paper presents high-resolution numerical simulations of the atmospheric flow and concentration fields accompanying scalar transport and diffusion from a point source in complex terrain. Scalar dispersion is affected not only by mean flow, ...

Takenobu Michioka; Fotini Katopodes Chow

2008-12-01T23:59:59.000Z

126

Modeling Wind Field and Pollution Transport over a Complex Terrain Using an Emergency Dose Information Code SPEEDI  

Science Conference Proceedings (OSTI)

Atmospheric dispersion code system SPEEDI (System for Prediction of Environmental Emergency Dose Information) has been applied to simulate the field experiments conducted over a complex terrain. A diagnostic mass-consistent wind field model of ...

R. Venkatesan; M. Möllmann-Coers; A. Natarajan

1997-09-01T23:59:59.000Z

127

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

DOE Green Energy (OSTI)

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.

Churchfield, M. J.

2013-06-01T23:59:59.000Z

128

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

SciTech Connect

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.

Churchfield, M. J.

2013-06-01T23:59:59.000Z

129

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

SciTech Connect

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.

Harindra Joseph Fernando James Anderson Don Boyer Neil Berman

2004-12-29T23:59:59.000Z

130

Effects of all-terrain vehicle trails on stream channel characteristics, Ouachita National Forest, Arkansas  

E-Print Network (OSTI)

Research shows that road and trail crossings have negative impacts on forest streams, and that off-road vehicles are detrimental to the environment. However, little information is available concerning the effects of such vehicles on stream channels and riverine environments. This research investigates the effects of all-terrain vehicles (ATVs), one of the many types of off-road vehicles, on stream channel characteristics in the Ouachita National Forest, Arkansas, where the Wolf Pen Gap All-Terrain Vehicle Trail system was built and opened to public use in 1991. Statistical analysis revealed significant differences in stream pool characteristics between the "pristine" control stream (Caney Creek) and those affected by ATV trails (Board Camp Creek and Gap Creek) in the national forest. Pools in Board Camp Creek and Gap Creek were found to have increased amounts of sands and fines, higher values of embeddedness, lower depths, and less volume. These characteristics are consistent with observations that ATV trails are primary sources of sediment input into stream channels. Statistical differences in pool characteristics between streams affected by forest roads (Brushy Creek) and those by ATV trails were also revealed, although forest roads apparently impact streams to a lesser extent than ATV trails. The effects of roads and trails on stream pool characteristics were illustrated using Geographic Information Systems. These findings have important implications for the ecological integrity of stream systems in areas affected by ATV trails. They also contribute potentially valuable information in the management context.

Rohrer, Deven Michelle

2001-01-01T23:59:59.000Z

131

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

Science Conference Proceedings (OSTI)

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.

Birdwell, Kevin R [ORNL

2011-05-01T23:59:59.000Z

132

Regional Weather Prediction with a Model Combining Terrain-following and Isentropic Coordinates. Part I: Model Description  

Science Conference Proceedings (OSTI)

A short-range numerical prediction model, which is part of a real-time 3-h data assimilation and forecast system, is described. The distinguishing feature of the model is the use of terrain-following (?) coordinate surfaces in the lower ...

Rainer Bleck; Stanley G. Benjamin

1993-06-01T23:59:59.000Z

133

Numerical Study of Terrain-Induced Mesoscale Motions and Hydrostatic Form Drag in a Heated, Growing Mixed Layer  

Science Conference Proceedings (OSTI)

A four-layer three-dimensional model whose lowest layer is a time and space-dependent, well-mixed boundary layer is employed over artificial, irregular terrain on the mesoscale during a daytime heating cycle. Only if the surface heating and mixed-...

J. W. Deardorff; K. Ueyoshi; Y-J. Han

1984-04-01T23:59:59.000Z

134

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

Science Conference Proceedings (OSTI)

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.

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

135

An analysis of terrain roughness: Generating a GIS application for prescribed burning.  

E-Print Network (OSTI)

??Prescribed burning is a technique used to rejuvenate pastures by enhancing wildlife habitat, brush control, and removing old growth. The technique has become a science… (more)

Crawford, Matthew Allan

2008-01-01T23:59:59.000Z

136

Effects of Terrain Heights and Sizes on Island-Scale Circulations and Rainfall for the Island of Hawaii during HaRP  

Science Conference Proceedings (OSTI)

Islands in Hawaii have different sizes and terrain heights with notable differences in climate and weather. In this study, the fifth-generation Pennsylvania State University–NCAR Mesoscale Model (MM5) land surface model (LSM) is used to conduct ...

Yang Yang; Yi-Leng Chen

2008-01-01T23:59:59.000Z

137

Estimating the Urban Heat Island Contribution to Urban and Rural Air Temperature Differences over Complex Terrain: Application to an Arid City  

Science Conference Proceedings (OSTI)

This study proposes a method for estimating the canopy-layer net urban heat island (UHI) in regions with complex terrain that lack preurban observations. The approach is based on a linear relationship between the urban–rural temperature ...

Hadas Saaroni; Baruch Ziv

2010-10-01T23:59:59.000Z

138

Role of Topography in Forcing Low-Level Jets in the Central United States during the 1993 Flood-Altered Terrain Simulations  

Science Conference Proceedings (OSTI)

Regional model sensitivity simulations in which the height of elevated terrain was reduced to explore simulated changes in features of the low-level jet (LLJ) are presented. Such an approach has not been reported, and it provides complementary ...

Zaitao Pan; Moti Segal; Raymond W. Arritt

2004-01-01T23:59:59.000Z

139

Weather Forecasts by the WRF-ARW Model with the GSI Data Assimilation System in the Complex Terrain Areas of Southwest Asia  

Science Conference Proceedings (OSTI)

This paper will first describe the forecasting errors encountered from running the National Center for Atmospheric Research (NCAR) mesoscale model (the Advanced Research Weather Research and Forecasting model; ARW) in the complex terrain of ...

J. Xu; S. Rugg; L. Byerle; Z. Liu

2009-08-01T23:59:59.000Z

140

A Comparison of Methods for Computing the Sigma-Coordinate Pressure Gradient Force for Flow over Sloped Terrain in a Hybrid Theta-Sigma Model  

Science Conference Proceedings (OSTI)

Five methods for computing the pressure gradient force within a sigma domain of a hybrid model are compared for flow over a steeply sloped terrain. The comparison includes pressure gradient calculations determined from a direct transformation to ...

Donald R. Johnson; Louis W. Uccellini

1983-04-01T23:59:59.000Z

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


141

Downscaling Climate over Complex Terrain: High Finescale (<1000 m) Spatial Variation of Near-Ground Temperatures in a Montane Forested Landscape (Great Smoky Mountains)  

Science Conference Proceedings (OSTI)

Landscape-driven microclimates in mountainous terrain pose significant obstacles to predicting the response of organisms to atmospheric warming, but few if any studies have documented the extent of such finescale variation over large regions. ...

Jason D. Fridley

2009-05-01T23:59:59.000Z

142

A Numerical Sensitivity Study on the Impact of Soil Moisture on Convection-Related Parameters and Convective Precipitation over Complex Terrain  

Science Conference Proceedings (OSTI)

The impact of soil moisture on convection-related parameters and convective precipitation over complex terrain is studied by numerical experiments using the nonhydrostatic Consortium for Small-Scale Modeling (COSMO) model. For 1 day of the ...

Christian Barthlott; Norbert Kalthoff

2011-12-01T23:59:59.000Z

143

Evaluating Satellite-Based Cloud Persistence and Displacement Nowcasting Techniques over Complex Terrain  

Science Conference Proceedings (OSTI)

The Moderate Resolution Imaging Spectroradiometer (MODIS) sensor aboard the Terra and Aqua satellites allows roughly for the same region of Earth to be sampled twice in a nowcasting time frame. Using the MODIS cloud mask at 5-km resolution and ...

Eric M. Guillot; Thomas H. Vonder Haar; John M. Forsythe; Steven J. Fletcher

2012-04-01T23:59:59.000Z

144

Tech. Rep. MSSU-COE-ERC-00-13, Engineering Research Center, Mississippi State University, 2000. Decoding of Large Terrains Using a Hardware Rendering Pipeline  

E-Print Network (OSTI)

the transmission and storage of enormous quantities of data [?]. For example, the application of interest of a digital elevation map (DEM) providing a 3D terrain surface; coupled to this 3D surface is an image mosaic between grid points of the DEM are generated. With larger DEMs, the sheer number of polygons can overwhelm

Fowler, James E.

145

Quarterly Journal of the Royal Meteorological Society Q. J. R. Meteorol. Soc. 136: 593616, April 2010 Part A Summer monsoon convection in the Himalayan region: Terrain  

E-Print Network (OSTI)

2010 Part A Summer monsoon convection in the Himalayan region: Terrain and land cover effects Socorro summer monsoon, convection occurs frequently near the Himalayan foothills. However, the nature-resolution numerical simulations and available observations from two case-studies and of the monsoon climatology

Niyogi, Dev

146

Influence of initial and boundary conditions for ozone modeling in very complex terrains: A case study in the northeastern Iberian Peninsula  

Science Conference Proceedings (OSTI)

Initial (IC) and boundary conditions (BC) are required in order to solve the set of stiff differential equations included in air quality models. In this work, the influences of IC-BC are analyzed in the northeastern Iberian Peninsula (NEIP) by applying ... Keywords: Air quality modeling, Complex terrains, Initial and boundary conditions, Ozone, Photochemistry

Pedro Jiménez; René Parra; José M. Baldasano

2007-09-01T23:59:59.000Z

147

The Effect of Topographic Variability on Initial Condition Sensitivity of Low-Level Wind Forecasts. Part II: Experiments Using Real Terrain and Observations  

Science Conference Proceedings (OSTI)

A study by Bieringer et al., which is Part I of this two-part study, demonstrated analytically using the shallow-water equations and numerically in controlled experiments that the presence of terrain can result in an enhancement of sensitivities ...

Paul E. Bieringer; Peter S. Ray; Andrew J. Annunzio

2013-07-01T23:59:59.000Z

148

Block-Iterative Method of Solving the Nonhydrostatic Pressure in Terrain-Following Coordinates: Two-Level Pressure and Truncation Error Analysis  

Science Conference Proceedings (OSTI)

A technique for the treatment of the pressure in anelastic, nonhydrostatic terrain-following coordinates is described. It involves the use of two levels of pressure in such a manner so as to ensure that the anelastic mass-continuity equation is ...

Terry L. Clark

2003-07-01T23:59:59.000Z

149

Precipitation over Concave Terrain  

Science Conference Proceedings (OSTI)

Many topographic barriers are comprised of a series of concave or convex ridges that modulate the intensity and distribution of precipitation over mountainous areas. In this model-based idealized study, stratiform precipitation associated with ...

Qingfang Jiang

2006-09-01T23:59:59.000Z

150

Rapid gravity and gravity gradiometry terrain correction via adaptive quadtree mesh discretization Kristofer Davis, M. Andy Kass, and Yaoguo Li, Center for Gravity, Electrical and Magnetic Studies, Colorado School  

E-Print Network (OSTI)

Rapid gravity and gravity gradiometry terrain correction via adaptive quadtree mesh discretization Kristofer Davis, M. Andy Kass, and Yaoguo Li, Center for Gravity, Electrical and Magnetic Studies, Colorado School of Mines SUMMARY We present a method for modeling the terrain response in gravity and gravity

151

Elsevier Editorial System(tm) for Computer Vision and Image Understanding Manuscript Draft Manuscript Number: Title: Terrain Modelling from lidar range data in natural landscapes: a predictive and Bayesian framework Article Type: Special Issue: New Advanc  

E-Print Network (OSTI)

Abstract: The Earth's topography, including vegetation and human-made features, reduced to a virtual 3D representation is a key geographic layer for any extended development or risk management project. Processed from multiple aerial images, or from airborne lidar systems, the 3D topography is first represented as a point cloud. This article deals with the generation of Digital Terrain Models in natural landscapes. We present a global methodology for estimating the terrain height by deriving a predictive filter paradigm. Under the assumption that the terrain topography (elevation and slope) is regular in a neighbouring system, a predictive filter combines linearly the predicted topographic values and the effective measured values. In this paper, it is applied to 3D lidar data which are known to be of high altimetric accuracy. The algorithm generates an adaptive local geometry wherein the altimetric distribution of the point cloud is analysed. Since local terrain elevations depend on the local slope, a predictive filter is first applied on the slopes then on the terrain elevations. The algorithm propagates through the point cloud following specific rules in order to optimize the probability of computing areas containing terrain points. Considered as an initial surface, theprevious DTM is finally regularized in a Bayesian framework. Our approach is based on the definition of an energy function that manages the evolution of a terrain surface. The energy is designed as a compromise between a data attraction term and a regularization term. The minimum of this energy corresponds to the

unknown authors

2008-01-01T23:59:59.000Z

152

Principal facts and a discussion of terrain correction methods for the complete Bouguer gravity anomaly map of the Cascade Mountains, Washington  

DOE Green Energy (OSTI)

Since 1974, the Division of Geology and Earth Resources, in conjunction with the US Department of Energy, has supported gravity studies in the Cascade Mountains of Washington State. Results of the Cascade gravity project are summarized graphically as a complete Bouguer gravity anomaly map of the Cascade Mountains, Washington (Danes and Phillips, 1983). This report provides supplementary data and documentation for the complete Bouguer gravity anomaly map. Presented are principal gravity facts, simple Bouguer and Free-air gravity anomalies, computational methods, error analysis and a discussion of terrain corrections.

Danes, Z.F.; Phillips, W.M.

1983-02-01T23:59:59.000Z

153

Correction and commentary for "Ocean forecasting in terrain-following coordinates: Formulation and skill assessment of the regional ocean modeling system" by Haidvogel et al., J. Comp. Phys. 227, pp. 3595-3624  

Science Conference Proceedings (OSTI)

Although our names appear as co-authors in the above article (Haidvogel et al. (2008) [1], hereafter H2008), we were not aware of its existence until after it was published. In reading the article, we discovered that a significant portion of it (~40%, ... Keywords: Conservation and constancy preservation, Regional ocean modeling, Split-explicit time stepping, Terrain-following coordinates

Alexander F. Shchepetkin; James C. McWilliams

2009-12-01T23:59:59.000Z

154

Dispersion Parameters over Forested Terrain  

Science Conference Proceedings (OSTI)

A unique set of micrometeorological data was obtained during a 1967–70 multidisciplinary environmental field program in a tropical forest environment. The program was under the sponsorship of the Advanced Research Project Agency (ARPA) and was ...

R. T. Pinker; J. Z. Holland

1988-11-01T23:59:59.000Z

155

Thuderstorm-Producing Terrain Features  

Science Conference Proceedings (OSTI)

Thunderstorms were traced back to their initiation sites to determine areas of repeated thunderstorm genesis over the Sangre de Cristo Mountains of Colorado and New Mexico. Using three summers of GOES data it was found that genesis-zone activity ...

Crystal Barker Schaaf; Robert M. Banta; Joshua Wurman

1988-03-01T23:59:59.000Z

156

Significant Decrease of Uncertainties in Sensible Heat Flux Simulation Using Temporally Variable Aerodynamic Roughness in Two Typical Forest Ecosystems of China  

Science Conference Proceedings (OSTI)

Aerodynamic roughness length zom is an important parameter for reliably simulating surface fluxes. It varies with wind speed, atmospheric stratification, terrain, and other factors. However, it is usually considered a constant. It is known that ...

Yanlian Zhou; Weimin Ju; Xiaomin Sun; Xuefa Wen; Dexin Guan

2012-06-01T23:59:59.000Z

157

Terrain effects in resistivity and magnetotelluric surveys  

Science Conference Proceedings (OSTI)

A three-dimensional finite element computer algorithm which can accommodate arbitrarily complex topography and subsurface structure, has been developed to model the resistivity response of the earth. The algorithm has undergone extensive evaluation and is believed to provide accurate results for realistic earth models. Testing included comparison to scale model measurements, analytically calculated solutions, and results calculated numerically by other independent means. Computer modeling experiments have demonstrated that it is possible to remove the effect of topography on resistivity data under conditions where such effects dominate the response. This can be done without resorting to lengthy and costly trial and error computer modeling. After correction, the data can be interpreted with confidence that the anomalies are due only to subsurface structure. The results of case studies on resistivity field data measured in high relief topography are discussed.

Holcombe, H.T.

1982-12-01T23:59:59.000Z

158

Nonlinear Balance in Terrain-Following Coordinates  

Science Conference Proceedings (OSTI)

Potential vorticity (PV) is a powerful concept in geophysical fluid dynamics. One property of PV that makes it so powerful is that it may be inverted under certain conditions, one of which is the imposition of a balance constraint. Previous ...

Steven G. Decker

2010-02-01T23:59:59.000Z

159

Surface Wind Regionalization in Complex Terrain  

Science Conference Proceedings (OSTI)

Daily wind variability in the Comunidad Foral de Navarra in northern Spain was studied using wind observations at 35 locations to derive subregions with homogeneous temporal variability. Two different methodologies based on principal component ...

P. A. Jiménez; E. García-Bustamante; J. F. González-Rouco; F. Valero; J. P. Montávez; J. Navarro

2008-01-01T23:59:59.000Z

160

productivity by use of digital terrain analysis  

Science Conference Proceedings (OSTI)

mechanisms for using biological sinks to offset fossil fuel emissions. It is necessary to elucidate the spatial vari- ability of forest productivity for developing

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


161

TERRAINOSAURUS REALISTIC TERRAIN SYNTHESIS USING GENETIC ALGORITHMS  

E-Print Network (OSTI)

skin macroenvironment keep hair SCs quies- cent (12). Telogen HFs in C phase are devoid activation, or non- autonomously, when activators are delivered by the surrounding macroenvironment between HFs by the skin macroenvironment. Together, HF and skin macroenvironment­derived ligands and antag

Keyser, John

162

Rough and Ready Biomass Facility | Open Energy Information  

Open Energy Info (EERE)

and Ready Biomass Facility and Ready Biomass Facility Jump to: navigation, search Name Rough and Ready Biomass Facility Facility Rough and Ready Sector Biomass Owner Rough and Ready Lumber Co. Location Cave Junction, Oregon Coordinates 42.1628912°, -123.6481235° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":42.1628912,"lon":-123.6481235,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

163

The Climatological Skill of a Regional Model over Complex Terrain  

Science Conference Proceedings (OSTI)

As part of an ongoing study of the regional climate and hydrology of the southwestern United States, in this paper we investigate the systematic biases of two versions of the PSU/NCAR mesoscale model (MM4). These are a standard version and one ...

Filippo Giorgi; Gary T. Bates

1989-11-01T23:59:59.000Z

164

A Physically Based Daily Hydrometeorological Model for Complex Mountain Terrain  

Science Conference Proceedings (OSTI)

This paper describes the continued development of the physically based hydrometeorological model Generate Earth Systems Science input (GENESYS) and its application in simulating snowpack in the St. Mary (STM) River watershed, Montana. GENESYS is ...

Ryan J. MacDonald; James M. Byrne; Stefan W. Kienzle

2009-12-01T23:59:59.000Z

165

A Study of the Influence of Terrain on Fog Development  

Science Conference Proceedings (OSTI)

A general purpose mesoscale numerical weather prediction model is used to simulate the development of fog at Perth, Western Australia, on 27 April 1990. Using one-dimensional and two-dimensional model configurations, an attempt is made to ...

B. W. Golding

1993-09-01T23:59:59.000Z

166

A Bistatic Sodar for Precision Wind Profiling in Complex Terrain  

Science Conference Proceedings (OSTI)

A new ground-based wind profiling technology—a scanned bistatic sodar—is described. The motivation for this design is to obtain a “mastlike” wind vector profile in a single atmospheric column extending from the ground to heights of more than 200 ...

Stuart Bradley; Sabine von Hünerbein; Torben Mikkelsen

2012-08-01T23:59:59.000Z

167

Mesoscale Snowfall Prediction and Verification in Mountainous Terrain  

Science Conference Proceedings (OSTI)

Short-term forecasting of precipitation often relies on meteorological radar coverage to provide information on the intensity, extent, and motion of approaching mesoscale features. However, in significant portions of mountainous regions, radar ...

Melanie Wetzel; Michael Meyers; Randolph Borys; Ray McAnelly; William Cotton; Andrew Rossi; Paul Frisbie; David Nadler; Douglas Lowenthal; Stephen Cohn; William Brown

2004-10-01T23:59:59.000Z

168

Length Scales of the Neutral Wind Profile over Homogeneous Terrain  

Science Conference Proceedings (OSTI)

The wind speed profile for the neutral boundary layer is derived for a number of mixing-length parameterizations, which account for the height of the boundary layer. The wind speed profiles show good agreement with the reanalysis of the Leipzig ...

Alfredo Peña; Sven-Erik Gryning; Jakob Mann; Charlotte B. Hasager

2010-04-01T23:59:59.000Z

169

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

Open Energy Info (EERE)

magnetic lows. This implies that fractures localize the hot springs. Magnetic gradient trends reflect the mapped Basin and Range structural trends of north and northwest, as well...

170

A Mesoscale Data Analysis and Downscaling Method over Complex Terrain  

Science Conference Proceedings (OSTI)

A mesoscale data analysis method for meteorological station reports is presented. Irregularly distributed measured values are combined with measurement-independent a priori information about the modification of analysis fields due to topographic ...

Reinhold Steinacker; Matthias Ratheiser; Benedikt Bica; Barbara Chimani; Manfred Dorninger; Wolfgang Gepp; Christoph Lotteraner; Stefan Schneider; Simon Tschannett

2006-10-01T23:59:59.000Z

171

Spectral Characteristics of the Convective Boundary Layer Over Uneven Terrain  

Science Conference Proceedings (OSTI)

The paper describes a convective boundary layer experiment conducted in April 1978 at the Boulder Atmospheric Observatory, and examines the spectral behavior of wind velocity and temperature from the Observatory's 300 m tower, from aircraft ...

J. C. Kaimal; R. A. Eversole; D. H. Lenschow; B. B. Stankov; P. H. Kahn; J. A. Businger

1982-05-01T23:59:59.000Z

172

Approaches for Averaging Surface Parameters and Fluxes over Heterogeneous Terrain  

Science Conference Proceedings (OSTI)

Successful prediction of possible climate change depends on realistic parameterization of land surface processes in climate models. Such parameterizations must take appropriate account of the heterogeneities that are found in most earth surfaces. ...

A. Chehbouni; E. G. Njoku; J-P. Lhomme; Y. H. Kerr

1995-05-01T23:59:59.000Z

173

MESOSCALE MODELLING OF WIND ENERGY OVER NON-HOMOGENEOUS TERRAIN  

E-Print Network (OSTI)

. Im Mittelpunkt stand die Vorstellung von Forschungs- projekten, die das BMU im Bereich der Offshore-Windenergie.spiekerooger-klimagespraeche.de Windenergie mit Potenzial Die Windenergie habe auf abseh- bare Zeit in Deutschland von allen erneuerbaren (BMU), Katherina Reiche, an- lässlich der Eröffnung der 3. Offshore- Wissenschaftstage in Oldenburg

Pielke, Roger A.

174

The Juneau Terrain-Induced Turbulence Alert System  

Science Conference Proceedings (OSTI)

The Juneau, Alaska, airport vicinity experiences frequent episodes of moderate and severe turbulence, which affect arriving and departing air traffic. The Federal Aviation Administration funded the National Center for Atmospheric Research to ...

Marcia K. Politovich; R. Kent Goodrich; Corrinne S. Morse; Alan Yates; Robert Barron; Steven A. Cohn

2011-03-01T23:59:59.000Z

175

Two-Zone Convective Scaling of Diffusion in Complex Terrain  

Science Conference Proceedings (OSTI)

A “two-zone” convective scaling equation is developed that allows for a step change in scaling parameters. The results of the Lompoc Valley Diffusion Experiment, conducted at coastal site in California under variable cloud cover, are compared to ...

C. E. Skupniewicz

1994-05-01T23:59:59.000Z

176

Correlation of Real and Model Wind Speeds in Different Terrains  

Science Conference Proceedings (OSTI)

Wind speeds over a 6-month period from 21 surface stations, 3 upper-wind stations, and 2 different models are compared. Similar data are used for three different topographic regions of New Zealand broadly classed as having low, moderate, and high ...

Steve J. Reid; Richard Turner

2001-10-01T23:59:59.000Z

177

Learning to visually predict terrain properties for planetary rovers  

E-Print Network (OSTI)

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 ...

Brooks, Christopher Allen, 1978-

2009-01-01T23:59:59.000Z

178

Mythical Terrain and the Building of Mexico’s UNAM  

E-Print Network (OSTI)

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

Davids, René

2008-01-01T23:59:59.000Z

179

Rough sets  

Science Conference Proceedings (OSTI)

Rough set theory, introduced by Zdzislaw Pawlak in the early 1980s [11, 12], is a new mathematical tool to deal with vagueness and uncertainty. This approach seems to be of fundamental importance to artificial intelligence (AI) and cognitive sciences, ...

Zdzislaw Pawlak; Jerzy Grzymala-Busse; Roman Slowinski; Wojciech Ziarko

1995-11-01T23:59:59.000Z

180

Fuzzy rough signatures  

Science Conference Proceedings (OSTI)

We extend the idea of Fuzzy Signature to Fuzzy Rough Signature (FRS). The proposed Fuzzy Rough Signature is capable of handling most kind of uncertainty: epistemic and random uncertainty, vagueness due to indiscernibility, and linguistic vagueness that ... Keywords: aggregation operators, fuzzy probability, fuzzy signatures, generalized weighted relevance aggregation operator (WRAO), mathematical theory of evidence, polymorphic fuzzy signatures (PFS), possibility, probability, probability of fuzzy events, rough fuzzy signatures, rough sets

B. S. U. Mendis; L. T. Kóczy

2009-08-01T23:59:59.000Z

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


181

ORIGINAL PAPER Rough convex cones and rough convex fuzzy cones  

E-Print Network (OSTI)

Abstract Based on the equivalence relation on a linear space, in this paper we introduce the definition of rough convex cones and rough convex fuzzy cones and discuss some of the fundamental properties of such rough convex cones.

Zuhua Liao; Juan Zhou

2012-01-01T23:59:59.000Z

182

Rough Ride Test Procedure  

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

NTP005 NTP005 Revision 2 Effective December 1, 2004 Electric Vehicle Rough Road Course Test Prepared by Electric Transportation Applications Prepared by: _______________________________ Date:__________ Ryan Harkins Approved by: _________________________________________________ Date: _______________ Donald B. Karner ©2004 Electric Transportation Applications All Rights Reserved Procedure ETA-NTP005 Revision 2 2 TABLE OF CONTENTS 1.0 Objectives 3 2.0 Purpose 3 3.0 Documentation 3 4.0 Initial Conditions and Prerequisites 4 5.0 Testing Activity Requirements 6 6.0 Glossary 12 7.0 References 14 Appendices Appendix A - Electric Vehicle Rough Road Test Data Sheet 15

183

Assimilating Surface Weather Observations from Complex Terrain into a High-Resolution Numerical Weather Prediction Model  

Science Conference Proceedings (OSTI)

An anisotropic surface analysis method based on the mother–daughter (MD) approach has been developed to spread valley station observations to grid points in circuitous steep valleys. In this paper, the MD approach is further refined to allow ...

Xingxiu Deng; Roland Stull

2007-03-01T23:59:59.000Z

184

Evaluation of Two Land Surface Schemes Used in Terrains of Increasing Aridity in West Africa  

Science Conference Proceedings (OSTI)

In this study different parameterizations for land surface models currently employed in meteorological models at ECMWF [Tiled ECMWF Surface Scheme for Exchange Processes over Land (TESSEL)] and NCEP (Noah) are evaluated for a semiarid region in ...

D. Schüttemeyer; A. F. Moene; A. A. M. Holtslag; H. A. R. de Bruin

2008-04-01T23:59:59.000Z

185

A New Approach to Humanitarian Demining. Part 1: Mobile Platform for Operation on Unstructured Terrain  

Science Conference Proceedings (OSTI)

Landmines can deprive whole areas of valuable resources, and continue to kill and cause injuries years after the end of armed conflicts. Armored vehicles are used for mine clearance, but with limited reliability. The final inspection of minefields is ... Keywords: buggy, combustion engine, demining, landmines

Paulo Debenest; Edwardo F. Fukushima; Yuki Tojo; Shigeo Hirose

2005-05-01T23:59:59.000Z

186

Terminal Doppler Weather Radar Observation of Atmospheric Flow over Complex Terrain during Tropical Cyclone Passages  

Science Conference Proceedings (OSTI)

A Terminal Doppler Weather Radar (TDWR) started operation in Hong Kong, China, in 1997 for monitoring wind shear associated with thunderstorms affecting the Hong Kong International Airport. The airport was built on land reclaimed from the sea and ...

C. M. Shun; S. Y. Lau; O. S. M. Lee

2003-12-01T23:59:59.000Z

187

Hydrometeorological Short-Range Ensemble Forecasts in Complex Terrain. Part II: Economic Evaluation  

Science Conference Proceedings (OSTI)

Two economic models are employed to perform a value assessment of short-range ensemble forecasts of 24-h precipitation probabilities for hydroelectric reservoir operation.

Doug McCollor; Roland Stull

2008-08-01T23:59:59.000Z

188

A Tornadic Supercell over Elevated, Complex Terrain: The Divide, Colorado, Storm of 12 July 1996  

Science Conference Proceedings (OSTI)

A supercell storm that produced a tornado and large hail over the Rocky Mountains is documented with WSR-88D data, a damage survey, and visual observations. This case study demonstrates how well the WSR-88D Doppler radar was able to detect this ...

Howard B. Bluestein

2000-03-01T23:59:59.000Z

189

Influence of Grid Size and Terrain Resolution on Wind Field Predictions from an Operational Mesoscale Model  

Science Conference Proceedings (OSTI)

One of the activities of the National Oceanic and Atmospheric Administration's Air Resources Laboratory is to predict the consequences of atmospheric releases of radioactivity and other potentially harmful materials. This paper describes the ...

Jeffery T. McQueen; Roland R. Draxler; Glenn D. Rolph

1995-10-01T23:59:59.000Z

190

Multiscale Analysis of a Meso-? Frontal Passage in the Complex Terrain of the Colorado Front Range  

Science Conference Proceedings (OSTI)

Data from a mesoscale observing network are used to describe the evolution of a complex boundary between a dry air mass near the foothills of the Rocky Mountains and a shallow moist air mass over the eastern plains. Synoptic-scale analyses ...

Lisa S. Darby; William D. Neff; Robert M. Banta

1999-09-01T23:59:59.000Z

191

Hydrometeorological Accuracy Enhancement via Postprocessing of Numerical Weather Forecasts in Complex Terrain  

Science Conference Proceedings (OSTI)

Statistical postprocessing techniques such as model output statistics are used by national weather centers to improve the skill of numerical forecasts. However, many of these techniques require an extensive database to develop, maintain, and ...

Doug McCollor; Roland Stull

2008-02-01T23:59:59.000Z

192

Surface-Layer Fluxes, Profiles, and Turbulence Measurements over Uniform Terrain under Near-Neutral Conditions  

Science Conference Proceedings (OSTI)

An atmospheric surface-layer experiment over a nearly uniform plowed field was performed to determine the constants in the flux-profile similarity formulas, particularly the von Kármán constant. New instruments were constructed to minimize flow ...

Steven P. Oncley; Carl A. Friehe; John C. Larue; Joost A. Businger; Eric C. Itsweire; Sam S. Chang

1996-04-01T23:59:59.000Z

193

Scaling Evaluation of the Effect of Surface Characteristics on Potential for Deep Convection over Uniform Terrain  

Science Conference Proceedings (OSTI)

The effect of surface characteristics on the daytime change in the potential for development of deep convection resulting from surface flux of heat and moisture is evaluated by conceptual, scaling, and numerical modeling approaches. It is shown ...

M. Segal; R. W. Arritt; C. Clark; R. Rabin; J. Brown

1995-02-01T23:59:59.000Z

194

Hydrometeorological Short-Range Ensemble Forecasts in Complex Terrain. Part I: Meteorological Evaluation  

Science Conference Proceedings (OSTI)

This paper addresses the question of whether it is better to include lower-resolution members of a nested suite of numerical precipitation forecasts to increase ensemble size, or to utilize high-resolution members only to maximize forecast ...

Doug McCollor; Roland Stull

2008-08-01T23:59:59.000Z

195

Coevolution of Down-Valley Flow and the Nocturnal Boundary Layer in Complex Terrain  

Science Conference Proceedings (OSTI)

An enhanced National Center for Atmospheric Research (NCAR) integrated sounding system (ISS) was deployed as part of the Vertical Transport and Mixing (VTMX) field experiment, which took place in October of 2000. The enhanced ISS was set up at ...

J. O. Pinto; D. B. Parsons; W. O. J. Brown; S. Cohn; N. Chamberlain; B. Morley

2006-10-01T23:59:59.000Z

196

Flow in Complex Terrain: Observations by Radar Wind Profilers and Anemometers near Juneau, Alaska  

Science Conference Proceedings (OSTI)

Four years of data from three radar wind profilers and collocated anemometers are used to examine the airflow regimes near Juneau, Alaska. Wind direction probability density functions and wind rose histograms show the dominant wind speeds and ...

Stephen A. Cohn

2004-04-01T23:59:59.000Z

197

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

E-Print Network (OSTI)

Controlled source electromagnetic (CSEM) geophysics has been used with a fair amount of success in near surface hydrogeological studies. Recently, these investigations have been conducted frequently in human impacted field sites containing cultural 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. In particular, it looks at the mutual coupling between a buried cultural conductor and a geological heterogeneity. We attempt to isolate the Hz field induced by tertiary currents in targets caused by mutual coupling. This is achieved with a Texas A&M 3D CSEM finite element code, which calculates the secondary Hz fields emanating from a target buried in a halfspace. Buried geological targets and cultural conductors are modeled as volumetric slabs embedded in a halfspace. A series of models have been simulated to study the effect of varying parameters such as target conductivity, transmitter location and shape of a target on the mutual inductance. In each case, the secondary Hz field is calculated for a model with two slabs, and two models with individual slabs. The mutual coupling is calculated by removing the secondary fields from the individual slab models from the response of a two slab model. The calculations of mutual inductance from a variety of such models suggests a complicated interaction of EM fields between the two targets. However, we can explain most of these complexities by adapting a simple approach to Maxwell’s equations. Although the tertiary Hz field is complicated, it may be useful in the characterization and delineation of electrical heterogeneities in the subsurface, which can then be related to geological features such as fractures or joints. It is seen that the most important factor affecting the mutual coupling is the host conductivity. The results have also shown that mutual coupling is very sensitive to transmitter (TX) location, especially when the TX is positioned near one of the targets.

Fernandes, Roland Anthony Savio

2008-05-01T23:59:59.000Z

198

Numerical Prediction of Submesoscale Flow in the Nocturnal Stable Boundary Layer over Complex Terrain  

Science Conference Proceedings (OSTI)

Numerical weather prediction models often perform poorly for weakly forced, highly variable winds in nocturnal stable boundary layers (SBLs). When used as input to air-quality and dispersion models, these wind errors can lead to large errors in ...

Nelson L. Seaman; Brian J. Gaudet; David R. Stauffer; Larry Mahrt; Scott J. Richardson; Jeffrey R. Zielonka; John C. Wyngaard

2012-03-01T23:59:59.000Z

199

Validation of Solar Radiation Surfaces from MODIS and Reanalysis Data over Topographically Complex Terrain  

Science Conference Proceedings (OSTI)

The magnitude and distribution of incoming shortwave solar radiation (SW?) has significant influence on the productive capacity of forest vegetation. Models that estimate forest productivity require accurate and spatially explicit radiation ...

Todd A. Schroeder; Robbie Hember; Nicholas C. Coops; Shunlin Liang

2009-12-01T23:59:59.000Z

200

Numerical Simulation of a Low-Level Jet over Complex Terrain in Southern Iran  

Science Conference Proceedings (OSTI)

The Lut Desert of Iran is an elongated valley oriented north-northwest to south-southeast. The valley descends southward to the Jaz Murian dry lake through a pass. The Navy’s Coupled Ocean–Atmosphere Mesoscale Prediction System is used to study a ...

Ming Liu; Douglas L. Westphal; Teddy R. Holt; Qin Xu

2000-05-01T23:59:59.000Z

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


201

Rotor and Subrotor Dynamics in the Lee of Three-Dimensional Terrain  

Science Conference Proceedings (OSTI)

The internal structure and dynamics of rotors that form in the lee of topographic ridges are explored using a series of high-resolution eddy-resolving numerical simulations. Surface friction generates a sheet of horizontal vorticity along the lee ...

James D. Doyle; Dale R. Durran

2007-12-01T23:59:59.000Z

202

Precipitation Estimation in Mountainous Terrain Using Multivariate Geostatistics. Part I: Structural Analysis  

Science Conference Proceedings (OSTI)

Values of average annual precipitation (AAP) are desired for hydrologic studies within a watershed containing Yucca Mountain, Nevada, a potential site for a high-level nuclear-waste repository. Reliable values of AAP are not yet available for ...

Joseph A. Hevesi; Jonathan D. Istok; Alan L. Flint

1992-07-01T23:59:59.000Z

203

Thermally and Dynamically Induced Pressure Features over Complex Terrain from High-Resolution Analyses  

Science Conference Proceedings (OSTI)

Within the Vienna Enhanced Resolution Analysis (VERA) Climatology (VERACLIM) project, the complex influence of topographic structures on the spatial distribution of meteorological parameters has been investigated and evaluated climatologically. ...

Benedikt Bica; Thomas Knabl; Reinhold Steinacker; Matthias Ratheiser; Manfred Dorninger; Christoph Lotteraner; Stefan Schneider; Barbara Chimani; Wolfgang Gepp; Simon Tschannett

2007-01-01T23:59:59.000Z

204

Precipitation Estimation in Mountainous Terrain Using Multivariate Geostatistics. Part II: Isohyetal Maps  

Science Conference Proceedings (OSTI)

Values of average annual precipitation (AAP) may be important for hydrologic characterization of a potential high-level nuclear-waste repository site at Yucca Mountain, Nevada. Reliable measurements of AAP are sparse in the vicinity of Yucca ...

Joseph A. Hevesi; Alan L. Flint; Jonathan D. Istok

1992-07-01T23:59:59.000Z

205

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

Science Conference Proceedings (OSTI)

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

N. Andrew Crook; Donna F. Tucker

2005-09-01T23:59:59.000Z

206

A Comparison of Statistical and Dynamical Downscaling of Winter Precipitation over Complex Terrain  

Science Conference Proceedings (OSTI)

Statistical downscaling is widely used to improve spatial and/or temporal distributions of meteorological variables from regional and global climate models. This downscaling is important because climate models are spatially coarse (50–200 km) and ...

Ethan D. Gutmann; Roy M. Rasmussen; Changhai Liu; Kyoko Ikeda; David J. Gochis; Martyn P. Clark; Jimy Dudhia; Gregory Thompson

2012-01-01T23:59:59.000Z

207

Forecasting Sun versus Shade in Complex Terrain for the 2010 Winter Olympic and Paralympic Games  

Science Conference Proceedings (OSTI)

During the 2010 Vancouver Winter Olympic and Paralympic Games in Canada, there were 10 mostly sunny days at the outdoor Olympic venues. The warmth and sunshine, possibly a result of El Niño conditions at the time, significantly reduced snow cover at one ...

Rosie Howard; Roland Stull

2011-10-01T23:59:59.000Z

208

Characterization of the ROAMS Simulation Environment for Testing Rover Mobility on Sloped Terrain  

E-Print Network (OSTI)

in the tight arcs due to interaction of the wheels with the underlying mixed sand and concrete paving stones types (clay, loose sand, mixed, etc.). 2.7. Wheel-soil contact model The primary goal of the wheel table has a mosaic of paving stones glued to a plywood surface and covered with a layer of fine sand

209

Evaluation of High-Resolution Satellite Precipitation Products over Very Complex Terrain in Ethiopia  

Science Conference Proceedings (OSTI)

This study focuses on the evaluation of 3-hourly, 0.25° × 0.25°, satellite-based precipitation products: the Tropical Rainfall Measuring Mission (TRMM) Multisatellite Precipitation Analysis (TMPA) 3B42RT, the NOAA/Climate Prediction Center ...

Feyera A. Hirpa; Mekonnen Gebremichael; Thomas Hopson

2010-05-01T23:59:59.000Z

210

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

E-Print Network (OSTI)

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 ...

Flores Cervantes, Javier Homero, 1977-

2010-01-01T23:59:59.000Z

211

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

E-Print Network (OSTI)

the Idaho Batholith . . . . . . . . . . . . . . . . . . . .and an application of the method in the Idaho Batholithalong two altitudinal transects in the Idaho Batholith

Ferrier, Ken

2009-01-01T23:59:59.000Z

212

Hierarchical visibility for guaranteed search in large-scale outdoor terrain  

Science Conference Proceedings (OSTI)

Searching for moving targets in large environments is a challenging task that is relevant in several problem domains, such as capturing an invader in a camp, guarding security facilities, and searching for victims in large-scale search and rescue scenarios. ... Keywords: Exploration, Guaranteed search, HRI, Human---robot-interaction, Moving target search, Path planning, Pursuit-evasion, Task allocation

A. Kleiner; A. Kolling; M. Lewis; K. Sycara

2013-01-01T23:59:59.000Z

213

Regional-Scale Flows in Mountainous Terrain. Part I: A Numerical and Observational Comparison  

Science Conference Proceedings (OSTI)

This study uses observed data and a numerical simulation to examine the generation of thermally driven flows across the Colorado mountain barrier on meso-? to meso-? scales. The observations were collected from remote surface observing systems at ...

James E. Bossert; William R. Cotton

1994-07-01T23:59:59.000Z

214

Mesoscale Weather Prediction with the RUC Hybrid Isentropic–Terrain-Following Coordinate Model  

Science Conference Proceedings (OSTI)

A mesoscale atmospheric forecast model configured in a hybrid isentropic–sigma vertical coordinate and used in the NOAA Rapid Update Cycle (RUC) for operational numerical guidance is presented. The RUC model is the only quasi-isentropic forecast ...

Stanley G. Benjamin; Georg A. Grell; John M. Brown; Tatiana G. Smirnova; Rainer Bleck

2004-02-01T23:59:59.000Z

215

Estimating the spatial and temporal distribution of snow in mountainous terrain  

E-Print Network (OSTI)

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,

Musselman, Keith Newton

2012-01-01T23:59:59.000Z

216

Mechanisms of Along-Valley Winds and Heat Exchange over Mountainous Terrain  

Science Conference Proceedings (OSTI)

The physical mechanisms leading to the formation of diurnal along-valley winds are investigated over idealized three-dimensional topography. The topography used in this study consists of a valley with a horizontal floor enclosed by two isolated ...

Juerg Schmidli; Richard Rotunno

2010-09-01T23:59:59.000Z

217

The Role of Terrain and Pressure Stresses in Rocky Mountain Lee Cyclones  

Science Conference Proceedings (OSTI)

The earth–atmosphere exchange of storm absolute dynamic circulation by mountain-induced surface pressure stress and the response of the circulation in a Rocky Mountain Ice cyclone is examined. Surface pressure stresses that transfer horizontal ...

Alan C. Czarnetzki; Donald R. Johnson

1996-04-01T23:59:59.000Z

218

Observations of a Subtropical Cold Front in a Region of Complex Terrain  

Science Conference Proceedings (OSTI)

The passage of shallow cold fronts during the late spring and early summer months over the island of Taiwan is often accompanied by heavy rainfall and occasional flash flood episodes. Previous studies have emphasized the weak baroclinicity of ...

Stanley B. Trier; David B. Parsons; Thomas J. Matejka

1990-12-01T23:59:59.000Z

219

The Initiation and Horizontal Scale Selection of Convection over Gently Sloping Terrain  

Science Conference Proceedings (OSTI)

Two- and three-dimensional numerical simulations were performed to investigate the scale selection and initiation of both moist and dry convection over gentle western and gentle eastern slopes where the latter represents an idealization of the ...

Jean-Luc Redelsperger; Terry L. Clark

1990-02-01T23:59:59.000Z

220

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

E-Print Network (OSTI)

Puerto Rico . . . . . . . . . . . . . . . . . . . . . .timescales: Measurements at Rio Icacos, Puerto RicoExperimental Forest, Puerto Rico. Earth and Planetary

Ferrier, Ken

2009-01-01T23:59:59.000Z

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


221

Surface Wind Regionalization over Complex Terrain: Evaluation and Analysis of a High-Resolution WRF Simulation  

Science Conference Proceedings (OSTI)

This study analyzes the daily-mean surface wind variability over an area characterized by complex topography through comparing observations and a 2-km-spatial-resolution simulation performed with the Weather Research and Forecasting (WRF) model ...

Pedro A. Jiménez; J. Fidel González-Rouco; Elena García-Bustamante; Jorge Navarro; Juan P. Montávez; Jordi Vilà-Guerau de Arellano; Jimy Dudhia; Antonio Muñoz-Roldan

2010-02-01T23:59:59.000Z

222

Vision-based terrain classification and classifier fusion for planetary exploration rovers  

E-Print Network (OSTI)

Autonomous rover operation plays a key role in planetary exploration missions. Rover systems require more and more autonomous capabilities to improve efficiency and robustness. Rover mobility is one of the critical components ...

Halatci, Ibrahim

2006-01-01T23:59:59.000Z

223

Modeling Snow-Cover Heterogeneity over Complex Arctic Terrain for Regional and Global Climate Models  

Science Conference Proceedings (OSTI)

The small-scale (10 to 100 m) and local-scale (100 m to 10 km) effects of topography (elevation, slope, and aspect) and snow redistribution by wind on the evolution of the snowmelt are investigated. The chosen study area is the 142 km2 Upper ...

Stephen J. Déry; Wade T. Crow; Marc Stieglitz; Eric F. Wood

2004-02-01T23:59:59.000Z

224

A knowledge-based fuzzy expert system to analyse degraded terrain  

Science Conference Proceedings (OSTI)

The quality of a site investigation campaign stands and falls with the quality of the preparatory desk study. This article presents a fuzzy expert system that improves conventional desk studies. The evaluation process is referred to as a ''multi-temporal ... Keywords: Aerial photo interpretation, Brownfields, Fuzzy logic, Kriging, Site investigation

Dieter D. Genske; Klemens Heinrich

2009-03-01T23:59:59.000Z

225

Dynamics of Local Circulations in Mountainous Terrain during the RHUBC-II Project  

Science Conference Proceedings (OSTI)

The Radiative Heating in Underexplored Bands Campaign (RHUBC-II) project was held from August to October 2009 in the Atacama Desert in Chile at 5320-m altitude. Observations from this experiment and a high-resolution numerical simulation with the ...

Julio C. Marín; Diana Pozo; Eli Mlawer; David D. Turner; Michel Curé

2013-10-01T23:59:59.000Z

226

A Statistical-Topographic Model for Mapping Climatological Precipitation over Mountainous Terrain  

Science Conference Proceedings (OSTI)

The demand for climatological precipitation fields on a regular grid is growing dramatically as ecological and hydrological models become increasingly linked to geographic information systems that spatially represent and manipulate model output. ...

Christopher Daly; Ronald P. Neilson; Donald L. Phillips

1994-02-01T23:59:59.000Z

227

I/O-Efficient Algorithms for Problems on Grid-Based Terrains  

Science Conference Proceedings (OSTI)

The potential and use of Geographic Information Systems is rapidly increasing due to the increasing availability of massive amounts of geospatial data from projects like NASA's Mission to Planet Earth. However, the use of these massive datasets also ...

Lars Arge; Laura Toma; Jeffrey Scott Vitter

2001-12-01T23:59:59.000Z

228

Ozone Cycles in the Western Mediterranean Basin: Interpretation of Monitoring Data in Complex Coastal Terrain  

Science Conference Proceedings (OSTI)

In summer, the complex layout of the coasts and mountains surrounding the western Mediterranean basin favors the development of mesoscale atmospheric recirculations and the formation of ozone reservoir layers above the coastal areas and the sea. ...

Millán M. Millán; Enrique Mantilla; Rosa Salvador; Adoración Carratalá; Maria José Sanz; Lucio Alonso; Gotzon Gangoiti; Marino Navazo

2000-04-01T23:59:59.000Z

229

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

E-Print Network (OSTI)

Chemical erosion rates andchemical weathering rates over millennial timescales:mineral-specific chemical weathering rates in saprolite and

Ferrier, Ken

2009-01-01T23:59:59.000Z

230

A Numerical Study of the Effect of Island Terrain on Tropical Cyclones  

Science Conference Proceedings (OSTI)

A triply nested, movable mesh model was used to study the behavior of tropical cyclones encountering island mountain ranges. The integration domain consisted of a 37° wide and 45° long channel, with an innermost mesh resolution of 1/6°. The ...

Morris A. Bender; Robert E. Tuleya; Yoshio Kurihara

1987-01-01T23:59:59.000Z

231

GeneTerrain: visual exploration of differential gene expression profiles organized in native biomolecular interaction networks  

Science Conference Proceedings (OSTI)

We propose a new network visualization technique using scattered data interpolation and surface rendering, based upon a foundation layout of a scalar field. Contours of the interpolated surfaces are generated to support multi-scale visual interaction ...

Qian You; Shiaofen Fang; Jake Yue Chen

2010-03-01T23:59:59.000Z

232

THREE-DIMENSIONAL TERRAIN EFFECTS IN ELECTRICAL AND MAGNETOMETRIC RESISTIVITY SURVEYS  

E-Print Network (OSTI)

1 Introduction The Electrical Resistivity Method • Terrainin Electrical Resistivity Surveys • • • • . • • . • • • • •effects in electrical resistivity and magnetometric

Oppliger, G.L.

2012-01-01T23:59:59.000Z

233

Numerical Simulations of Atmospheric Transport and Diffusion over Coastal Complex Terrain  

Science Conference Proceedings (OSTI)

The purpose of this study was to demonstrate the feasibility of operating the three-dimensional atmospheric models HOTMAC (higher-order turbulence model for atmospheric circulation) and RAPTAD (random puff transport and diffusion) to forecast the ...

T. Yamada; S. Bunker; M. Moss

1992-06-01T23:59:59.000Z

234

Satellite-Based Actual Evapotranspiration over Drying Semiarid Terrain in West Africa  

Science Conference Proceedings (OSTI)

A simple satellite-based algorithm for estimating actual evaporation based on Makkink’s equation is applied to a seasonal cycle in 2002 at three test sites in Ghana, West Africa: at a location in the humid tropical southern region and two in the ...

D. Schüttemeyer; Ch Schillings; A. F. Moene; H. A. R. de Bruin

2007-01-01T23:59:59.000Z

235

Submesoscale Spatiotemporal Variability of North American Monsoon Rainfall over Complex Terrain  

Science Conference Proceedings (OSTI)

The authors analyze information from rain gauges, geostationary infrared satellites, and low earth orbiting radar in order to describe and characterize the submesoscale (<75 km) spatial pattern and temporal dynamics of rainfall in a 50 km × 75 km ...

Mekonnen Gebremichael; Enrique R. Vivoni; Christopher J. Watts; Julio C. Rodríguez

2007-05-01T23:59:59.000Z

236

Extending the Numerical Stability Limit of Terrain-Following Coordinate Models over Steep Slopes  

Science Conference Proceedings (OSTI)

To extend the numerical stability limit over steep slopes, a truly horizontal pressure-gradient discretization based on the ideas formulated by Mahrer in the 1980s has been developed. Conventionally, the pressure gradient is evaluated in the ...

Günther Zängl

2012-11-01T23:59:59.000Z

237

A Dispersion Model Evaluation Study for Real-Time Application in Complex Terrain  

Science Conference Proceedings (OSTI)

A few tracer experiments were carried out in autumn 1984 and summer 1985 at the Lago Brasimone site, on the Appennini Mountains approximately 50 km south of Bologna with the purpose assessing the atmospheric dispersion of pollutants under ...

F. Desiato

1991-08-01T23:59:59.000Z

238

Snowfall Associated with a Terrain-Generated Convergence Zone during the Winter Icing and Storm Project  

Science Conference Proceedings (OSTI)

The Longmont anticyclone, a region of low-level anticyclonic turning and convergence during episodes of northerly winds along the Front Range of the Rocky Mountains, is documented for a snow event that occurred during the Winter Icing and Storms ...

Douglas A. Wesley; Roy M. Rasmussen; Ben C. Bernstein

1995-10-01T23:59:59.000Z

239

Daytime Boundary Layer Evolution over Mountainous Terrain. Part II: Numerical Studies of Upslope Flow Duration  

Science Conference Proceedings (OSTI)

Numerical simulators of upslope flow forming on the lee side of a heated mountain ridge showed this flow to be a transient phenomenon, in agreement with observations. The simulations, performed with a two-dimensional, dry version of the cloud ...

Robert M. Banta

1986-06-01T23:59:59.000Z

240

Granular Rough Theory: A representation semantics oriented theory of roughness  

Science Conference Proceedings (OSTI)

The present work is an archival paper for a series of contributions proposed in last few years on building a theory of roughness over pure mereological relations among information granules. There are five major efforts taken in the present paper: (1) ... Keywords: Granular Representation Calculus, Granular Rough Theory, Granular-Rough Computational Web Intelligence

Bo Chen; Ming Sun; Mingtian Zhou

2009-03-01T23:59:59.000Z

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


241

Rough Rock, Arizona: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Rock, Arizona: Energy Resources Rock, Arizona: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 36.4072229°, -109.8728929° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":36.4072229,"lon":-109.8728929,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

242

Evaluation of Surface Analyses and Forecasts with a Multiscale Ensemble Kalman Filter in Regions of Complex Terrain  

Science Conference Proceedings (OSTI)

Previous research suggests that an ensemble Kalman filter (EnKF) data assimilation and modeling system can produce accurate atmospheric analyses and forecasts at 30–50-km grid spacing. This study examines the ability of a mesoscale EnKF system ...

Brian C. Ancell; Clifford F. Mass; Gregory J. Hakim

2011-06-01T23:59:59.000Z

243

The Influence of Terrain-Induced Circulations on Wintertime Temperature and Snow Level in the Washington Cascades  

Science Conference Proceedings (OSTI)

This paper describes the mesoscale distribution of temperature and snow level in the Washington Cascades. During the winter months, when the Cascades separate relatively cold continental air to the east from warmer marine air to the west, ...

W. James Steenburgh; Clifford F. Mass; Sue A. Ferguson

1997-06-01T23:59:59.000Z

244

Ocean forecasting in terrain-following coordinates: Formulation and skill assessment of the Regional Ocean Modeling System  

Science Conference Proceedings (OSTI)

Systematic improvements in algorithmic design of regional ocean circulation models have led to significant enhancement in simulation ability across a wide range of space/time scales and marine system types. As an example, we briefly review the Regional ... Keywords: Biogeochemical cycles, Incompressible Navier-Stokes equations, Regional ocean prediction, Sea ice modeling, Split-explicit time stepping

D. B. Haidvogel; H. Arango; W. P. Budgell; B. D. Cornuelle; E. Curchitser; E. Di Lorenzo; K. Fennel; W. R. Geyer; A. J. Hermann; L. Lanerolle; J. Levin; J. C. McWilliams; A. J. Miller; A. M. Moore; T. M. Powell; A. F. Shchepetkin; C. R. Sherwood; R. P. Signell; J. C. Warner; J. Wilkin

2008-03-01T23:59:59.000Z

245

Using an implicit min/max KD-tree for doing efficient terrain line of sight calculations  

Science Conference Proceedings (OSTI)

The generation of accurate Line of Sight (LOS) visibility information consumes significant resources in large scale synthetic environments such as many-on-many serious games and battlefield simulators. Due to the importance of optimum utilisation of ... Keywords: implicit kd-tree, line of sight, spherical earth

Bernardt Duvenhage

2009-02-01T23:59:59.000Z

246

The Sensitivity of Precipitation and Snowpack Simulations to Model Resolution via Nesting in Regions of Complex Terrain  

Science Conference Proceedings (OSTI)

This paper examines the sensitivity of regional climate simulations to increasing spatial resolution via nesting by means of a 20-yr simulation of the western United States at 40-km resolution and a 5-yr simulation at 13-km resolution for the ...

L. Ruby Leung; Yun Qian

2003-12-01T23:59:59.000Z

247

The Influence of Terrain on the Severe Weather Distribution across Interior Eastern New York and Western New England  

Science Conference Proceedings (OSTI)

Forecasters have surmised that prominent mountain ranges and river valleys in eastern New York and western New England (e.g., Hudson and Mohawk River valleys; Adirondack, Catskill, Green, and Berkshire Mountains) affect convective initiation and ...

Alicia C. Wasula; Lance F. Bosart; Kenneth D. LaPenta

2002-12-01T23:59:59.000Z

248

Conoco's new approach to drill site construction in difficult, remote, swamp and jungle terrain Irian Jaya, Indonesia  

SciTech Connect

In October 1982, Conoco Irian Jaya as operator: and partners: Pertamina, Inpex Bintuni Limited, and Moeco Irian Jaya Company, mobilized construction equipment from Singapore to the KBS ''A'' contract area in Irian Jaya, Indonesia for the purpose of constructing a base camp and drill three exploratory sites. What made this construction effort different from others previously used in Irian Jaya; was that it incorporated several new and unique features, namely: a turnkey approach to construction; that is Conoco providing complete set of specifications and conditions with contractor assuming risks for a lump sum payment; special equipment designed by contractor for Irian Jaya operations; an incentive to co pensate or penalize contractor for helicopter hours flown below or above a predetermined number; structural steel pile platform designs for two swamp locations (Ayot and Aum), as opposed to the more conventional corduroy timber log-plank arrangement; and drilling rig pads designed for specific heli-rig with limited extra space. All work was successfully completed within the time frame stipulated in the contract, that is five months from the time the contractor was notified to begin mobilization of equipment, materials and personnel.

Roodriguez, F.H.

1984-02-01T23:59:59.000Z

249

An Intense, Quasi-Steady Thunderstorm over Mountainous Terrain. Part I: Evolution of the Storm-Initiating Mesoscale Circulation  

Science Conference Proceedings (OSTI)

A detailed, multisensor case study of mesoscale convective storms occurring in summer over the central and eastern Colorado Rockies is presented. This case study uses data obtained during the 1977 South Park Area Cumulus Experiment (SPACE) from ...

W. R. Cotton; R. L. George; K. R. Knupp

1982-02-01T23:59:59.000Z

250

Intermediate or Senior Surficial Geologist or Terrain Scientist Our Environmental Services group is dedicated to managing environmental issues  

E-Print Network (OSTI)

, Tau Beta Pi, Sigma Xi, and AAAS. Combined Discussion" 2 H. W. Dommel (University of British Columbia, Vancouver, Canada) and J. E. Drakos, P. S. Wong, R. M. Shier, and J. H. Sawada (British Columbia Hydro METHOD FOR BURIED PIPELINE VOLTAGES DUE TO 60 Hz AC INDUCTIVE COUPLING PART I - ANALYSIS Allen Taflove

Montréal, Université de

251

Comparisons between Mesoscale Model Terrain Sensitivity Studies and Doppler Lidar Measurements of the Sea Breeze at Monterey Bay  

Science Conference Proceedings (OSTI)

A NOAA/Environmental Technology Laboratory Doppler lidar measured the life cycle of the land- and sea-breeze system at Monterey Bay, California, in 1987, during the Land–Sea Breeze Experiment (LASBEX). On days with offshore synoptic flow, the ...

Lisa S. Darby; Robert M. Banta; Roger A. Pielke Sr.

2002-12-01T23:59:59.000Z

252

Performance of Hot Plate for measuring Solid Precipitation in Complex Terrain during the 2010 Vancouver Winter Olympics  

Science Conference Proceedings (OSTI)

Solid precipitation intensity, snow density, wind speed, and temperature were collected from November 2009 to February 2010 at a naturally sheltered station located at an altitude of 1640 m ASL on Whistler Mountain in British Colombia, Canada. The ...

Faisal S. Boudala; Roy Rasmussen; George A. Isaac; Bill Scott

253

R E F E R E E D P A P E R Interactive Local Terrain Deformation Inspired by  

E-Print Network (OSTI)

into height maps using shader programs running on graphics hardware. The height field is edited indirectly. To further improve performance, we use a graphics processing unit implementation where a vertex shader computes the deformed positions of the model to be displayed. The vertex shader is a processing function

Kurapov, Alexander

254

An Overview of MADONA: A Multinational Field Study of High-Resolution Meteorology and Diffusion over Complex Terrain  

Science Conference Proceedings (OSTI)

The multination, high-resolution field study of Meteorology And Diffusion Over Non-Uniform Areas (MADONA) was conducted by scientists from the United States, the United Kingdom, Germany, Denmark, Sweden, and the Netherlands at Porton Down, ...

R. M. Cionco; J. H. Byers; Waufm Kampe; H. van Raden; H. Weber; C. Biltoft; C. G. Collins; T. J. Higgs; C. D. Jones; D. J. Ride; R. Robson; A. R. T. Hin; P-E. Johansson; K. Nyrén; H. E. Jørgensen; T. Mikkelsen; J. M. Santabarbara; S. Thykier-Nielsen; J. F. Kimber; J. Streicher

1999-01-01T23:59:59.000Z

255

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

E-Print Network (OSTI)

D8): Yeh PJ and Eltahir EAB, “Representation of Water TableYeh and Eltahir, 2005; Fan et al, 2007). Additionally, waterYeh and Eltahir (2005) addressed errors in predicted land surface fluxes especially for shallow water

Rihani, Jehan

2010-01-01T23:59:59.000Z

256

Final Technical Report: Development of the DUSTRAN GIS-Based Complex Terrain Model for Atmospheric Dust Dispersion  

SciTech Connect

Activities at U.S. Department of Defense (DoD) training and testing ranges can be sources of dust in local and regional airsheds governed by air-quality regulations. The U.S. Department of Energy’s Pacific Northwest National Laboratory just completed a multi-year project to develop a fully tested and documented atmospheric dispersion modeling system (DUST TRANsport or DUSTRAN) to assist the DoD in addressing particulate air-quality issues at military training and testing ranges.

Allwine, K Jerry; Rutz, Frederick C.; Shaw, William J.; Rishel, Jeremy P.; Fritz, Brad G.; Chapman, Elaine G.; Hoopes, Bonnie L.; Seiple, Timothy E.

2007-05-01T23:59:59.000Z

257

Categorization of Nocturnal Drainage Flows within the Brush Creek Valley and the Variability of Sigma Theta in Complex Terrain  

Science Conference Proceedings (OSTI)

The monthly frequencies of nocturnal drainage flows in the Brush Creek Valley were estimated over the period August 1982–January 1985 for the purpose of evaluating the representativeness of the drainage flows observed during a few intensive study ...

Paul H. Gudiksen

1989-06-01T23:59:59.000Z

258

Dispersion in Complex Terrain: A Summary of the AMS Workshop held in Keystone, Colorado, 17–20 May 1983  

Science Conference Proceedings (OSTI)

This article summarizes a workshop convened under the direction of the AMS Steering Committee for the EPA (Environmental Protection Agency) Cooperative Agreement on Air Quality Modeling. The purpose of the workshop was to address the status of ...

Bruce A. Egan; Francis A. Schiermeier

1986-10-01T23:59:59.000Z

259

Etude pétrologique, géochimique et structurale des terrains cristallins de Belledonne entre l'Arc et l'Isère (Alpes françaises).  

E-Print Network (OSTI)

??La chaine de Belledonne est l'un des massifs cristallins,comme le Mont Blanc, l'Aar-Gothard au Nord-Est, les grandes Rousses , les Ecrins-Pelvoux, l'Argentera-Mercantour au Sud-Est. Ces… (more)

Simeon, Yves

260

The Development of a Prototype Coupled Analysis and Nowcasting Knowledge-based System for Complex-Terrain Interaction Studies  

Science Conference Proceedings (OSTI)

An experimental weather classification, analysis, and nowcasting system, based upon a combination of artificial intelligence techniques and conventional numerical modeling, and designed for use as a real-time range/field forecasting aid, is ...

Montie M. Orgill; John D. Kincheloe; Robert A. Sutherland

1992-06-01T23:59:59.000Z

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


261

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

E-Print Network (OSTI)

mesoscale simulations for wind energy applications, in Fallin Proceedings of the American Wind Energy Association WindWorkshop, American Wind Energy Association, Washington, DC,

Lundquist, Katherine Ann

2010-01-01T23:59:59.000Z

262

Use of Mass Conservation and Critical Dividing Streamline concepts for Efficient Objective Analysis of Winds in Complex Terrain  

Science Conference Proceedings (OSTI)

Observed winds and temperature profiles can be used to generate three-dimensional, mass-conserving wind fields that reflect topographical influences. The concept of critical dividing streamlines is used to define quasi-horizontal, flow-confining ...

F. L. Ludwig; J. M. Livingston; R. M. Endlich

1991-11-01T23:59:59.000Z

263

Horizontal Heat Fluxes over Complex Terrain Computed Using a Simple Mixed-Layer Model and a Numerical Model  

Science Conference Proceedings (OSTI)

The thermally induced local circulation over a periodic valley is simulated by a two-dimensional numerical model that does not include condensational processes. During the daytime of a clear, calm day, heat is transported from the mountainous ...

Fujio Kimura; Tuneo Kuwagata

1995-02-01T23:59:59.000Z

264

Mapping the Terrain: Language Testing and Placement for US-Educated Language Minority Students in California's Community Colleges [EXECUTIVE SUMMARY  

E-Print Network (OSTI)

college students. Sacramento, CA: Legislative Analyst'shigher education. Sacramento, CA: ICAS. Retrieved fromStudent fee handbook. Sacramento, CA: California Community

Bunch, George; Endris, Ann; Panayotova, Dora; Romero, Michelle; Llosa, Lorena

2011-01-01T23:59:59.000Z

265

Microsoft Word - Chapter 06.doc  

National Nuclear Security Administration (NNSA)

the pollutants away from their source, by turbulent air motion that results from solar heating of the Earth's surface, and by air movement over rough terrain and surfaces....

266

Factorization methods for photonics and rough surfaces.  

E-Print Network (OSTI)

??This thesis investigates non-destructive testing problems for rough and periodic surfaces, where the task is to determine such structures from scattered waves. Such problems are… (more)

Lechleiter, Armin

2008-01-01T23:59:59.000Z

267

Numerical Schemes for Rough Parabolic Equations  

SciTech Connect

This paper is devoted to the study of numerical approximation schemes for a class of parabolic equations on (0,1) perturbed by a non-linear rough signal. It is the continuation of Deya (Electron. J. Probab. 16:1489-1518, 2011) and Deya et al. (Probab. Theory Relat. Fields, to appear), where the existence and uniqueness of a solution has been established. The approach combines rough paths methods with standard considerations on discretizing stochastic PDEs. The results apply to a geometric 2-rough path, which covers the case of the multidimensional fractional Brownian motion with Hurst index H>1/3.

Deya, Aurelien, E-mail: deya@iecn.u-nancy.fr [Universite de Nancy 1, Institut Elie Cartan Nancy (France)

2012-04-15T23:59:59.000Z

268

ROUGHNESS LENGTHS FOR THE SAVANNAH RIVER SITE  

SciTech Connect

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.

Hunter, C.

2012-03-28T23:59:59.000Z

269

RFCM: A Hybrid Clustering Algorithm Using Rough and Fuzzy Sets  

Science Conference Proceedings (OSTI)

A hybrid unsupervised learning algorithm, termed as rough-fuzzy c-means, is proposed in this paper. It comprises a judicious integration of the principles of rough sets and fuzzy sets. While the concept of lower and upper approximations of rough sets ... Keywords: Pattern recognition, clustering, data mining, fuzzy c-means, rough sets

Pradipta Maji; Sankar K. Pal

2007-12-01T23:59:59.000Z

270

Combinatorial Block Copolymer Ordering on Tunable Rough  

DOE Green Energy (OSTI)

Morphology control of block copolymer (BCP) thin films through substrate interaction via controlled roughness parameters is of significant interest for numerous high-tech applications ranging from solar cells to high-density storage media. While effects of substrate surface energy (SE) and roughness (R) on BCP morphology have been individually investigated, their synergistic effects have not been explored in any systematic manner. Interestingly, orientation response of BCP to changes in SE can be similar to what can be accomplished with variations in R. Here we present a novel approach for orienting lamellar BCP films of poly(styrene)-block-poly(methyl methacrylate) (PS-PMMA) on spin-coated xerogel (a dried gel of silica nanoparticle network) substrate with simultaneously tunable surface energy, {gamma}{sub s} {approx} 29-53 mJ/m{sup 2}, by UVO exposure and roughness, R{sub rms} {approx} 0.5-30 nm, by sol-gel processing steps of regulating the catalyst concentration and sol aging time. As in previous BCP orientation studies on 20 nm diameter monodisperse silica nanoparticle coated surface, we find a similar but broadened oscillatory BCP orientation behavior with film thickness due to the random rather than periodic rough surfaces. We also find that higher random roughness amplitude is not the necessary criteria for obtaining a vertical orientation of BCP lamellae. Rather, a high surface fractal dimension (D{sub f} > 2.4) of the rough substrate in conjunction with an optimal substrate surface energy {gamma}{sub s} 29 mJ/m{sup 2} results in 100% vertically oriented lamellar microdomains. The AFM measured film surface microstructure correlates well with the internal 3D BCP film structure probed by grazing incidence small-angle X-ray scattering (GISAXS) and rotational small-angle neutron scattering (SANS). In contrast to tunable self-assembled monolayer (SAM)-coated substrates, the xerogel films are very durable and retain their chemical properties over period of several months. These results also highlight importantly that BCP orientation control for nanotechnology is possible not only on specially prepared patterned substrates but also on industrially viable sol-gel substrates.

Kulkarni M. M.; Yager K.; Sharma, A.; Karim, A.

2012-05-01T23:59:59.000Z

271

A timeshared foreline and roughing vacuum system  

SciTech Connect

A system to perform turbomolecular drag foreline pumping and scattering chamber roughing was installed in the Surface Modification and Characterization Research Center at Oak Ridge National Laboratory. The system consists of an oil-free mechanical scroll pump that can be connected to either a roughing manifold serving four scattering chambers or to a foreline ballast tank and manifold serving five turbomolecular drag pumps. A controller mediates the demands of the two manifolds, giving priority to the foreline. Due to the low leakage from the accelerator beamlines, the duty cycle in the foreline pumping mode consists of a few minutes of operating time every few days, greatly reducing wear on the scroll pump. Significant savings are realized due to reduced consumption of liquid nitrogen for sorption pumping, elimination of oil changes and repairs to individual mechanical foreline pumps, and lower electrical power consumption.

Hensley, D.K.; Thomas, D.K.; Poker, D.B. [Oak Ridge National Lab., TN (United States). Solid State Div.

1997-11-01T23:59:59.000Z

272

On the Parameterization of Surface Roughness at Regional Scales  

Science Conference Proceedings (OSTI)

A parameterization for surface roughness and blending height at regional scales, under neutral atmospheric stability, is studied and tested. The analysis is based on a suite of large-eddy simulations (LES) over surfaces with varying roughness ...

Elie Bou-Zeid; Marc B. Parlange; Charles Meneveau

2007-01-01T23:59:59.000Z

273

Internal Wave Reflection and Scatter from Sloping Rough Topography  

Science Conference Proceedings (OSTI)

Internal gravity waves propagating in a uniformly stratified ocean are scattered on reflection from a rough inclined boundary. The boundary is inclined at angle ? to the horizontal and the roughness is represented by superimposed sinusoidal ...

S. A. Thorpe

2001-02-01T23:59:59.000Z

274

A Note on the Ocean Surface Roughness Spectrum  

Science Conference Proceedings (OSTI)

In a recent study, the dimensionless surface roughness spectrum has been empirically parameterized as a power-law function of the dimensionless wind speed expressed as the ratio of wind friction velocity and phase speed of the surface roughness ...

Paul A. Hwang

2011-03-01T23:59:59.000Z

275

On the Climate Impact of Surface Roughness Anomalies  

Science Conference Proceedings (OSTI)

Large-scale deployment of wind power may alter climate through alteration of surface roughness. Previous research using GCMs has shown large-scale impacts of surface roughness perturbations but failed to elucidate the dynamic mechanisms that ...

Daniel B. Kirk-Davidoff; David W. Keith

2008-07-01T23:59:59.000Z

276

One-Level Diagnostic Modeling of Mesoscale Surface Winds in Complex Terrain. Part I: Comparison with Three-Dimensional Modeling in Israel  

Science Conference Proceedings (OSTI)

A one-level sigma-coordinate model originally developed by Danard and modified by Mass and Dempsey and Alpert et al., is applied to the study of surface flow over an averaged summer diurnal cycle in Israel. The detailed flow features are compared ...

P. Alpert; B. Getenio

1988-10-01T23:59:59.000Z

277

Patterns of Cloud-to-Ground Lightning and Convective Rainfall Associated with Postwildfire Flash Floods and Debris Flows in Complex Terrain of the Western United States  

Science Conference Proceedings (OSTI)

Flash flood and debris flow reports from Storm Data and the U.S. Geological Survey (USGS) are used to investigate the relationship between hazardous hydrological responses, convective rainfall, and cloud-to-ground (CG) lightning flash parameters. ...

S. Jeffrey Underwood; Michael D. Schultz

2004-10-01T23:59:59.000Z

278

Integration of the Fully Elastic Equations Cast in the Hydrostatic Pressure Terrain-Following Coordinate in the Framework of the ARPEGE/Aladin NWP System  

Science Conference Proceedings (OSTI)

ARPEGE/Aladin is a limited-area 3D primitive equation model, which belongs to the integrated NWP ARPEGE/IFS system. Like its global counterpart, the limited-area version has a spectral representation of variables in the horizontal but uses double-...

Radmila Bubnová; Gwenaëlle Hello; Pierre Bénard; Jean-François Geleyn

1995-02-01T23:59:59.000Z

279

An Application of the Immersed Boundary Method for Recovering the Three-Dimensional Wind Fields over Complex Terrain Using Multiple-Doppler Radar Data  

Science Conference Proceedings (OSTI)

This study develops an extension of a variational-based multiple-Doppler radar synthesis method to construct the three-dimensional wind field over complex topography. The immersed boundary method (IBM) is implemented to take into account the ...

Yu-Chieng Liou; Shao-Fan Chang; Juanzhen Sun

2012-05-01T23:59:59.000Z

280

Evaluation of WRF-predicted near-hub-height winds and ramp events over a Pacific Northwest site with complex terrain  

Science Conference Proceedings (OSTI)

One challenge with wind power forecasts is the accurate prediction of rapid changes in wind speed (ramps). To evaluate the Weather Research and Forecasting (WRF) model’s ability to predict such events, model simulations, conducted over an area of ...

Qing Yang; Larry K. Berg; Mikhail Pekour; Jerome D. Fast; Rob K. Newsom; Mark Stoelinga; Catherine Finley

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


281

The Use of Satellite Imagery and Surface Pressure-Gradient Analysis Modified for Sloping Terrain to Analyze the Mesoscale Events Preceding the Severe Hailstorms of 2 August 1986  

Science Conference Proceedings (OSTI)

Conditions leading up to an outbreak of severe hailstorms in northeast Colorado are examined using satellite and surface data. A persistent mesoscale ridge of surface-high pressure, caused by outflow from a mesoscale- convective system, is seen ...

John F. Weaver; James J. Toth

1990-06-01T23:59:59.000Z

282

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)

sensible heat flux (W/m 2 ) on 350 m grid for (a) weaksensible heat flux (W/m 2 ) on 350 m grid for (a) weakgrids to some extent through the advection and mixing terms of the heat

Daniels, Megan Hanako

2010-01-01T23:59:59.000Z

283

Impacts of Post-Dam Land-use/Land-Cover Changes on Modification of Extreme Precipitation in Contrasting Hydro-climate and Terrain Features  

Science Conference Proceedings (OSTI)

Understanding the impact of post-dam climate feedbacks, due to land-use/land-cover (LULC)variability, on modification of extreme precipitation (EP) remains a challenge for a 21st century approach to dam design and operation. In this study, we used ...

Abel T. Woldemichael; Faisal Hossain; Roger Pielke Sr.

284

Estimation of daily actual evapotranspiration from remotely sensed data under complex terrain over the upper Chao river basin in North China  

Science Conference Proceedings (OSTI)

Daily actual evapotranspiration over the upper Chao river basin in North China on 23 June 2005 was estimated based on the Surface Energy Balance Algorithm for Land (SEBAL), in which the parameterization schemes for calculating the instantaneous solar ...

Yanchun Gao; Di Long; Zhao-Liang Li

2008-06-01T23:59:59.000Z

285

The Effect of Topographic Variability on Initial Condition Sensitivity of Low-Level Wind Forecasts. Part I: Experiments Using Idealized Terrain  

Science Conference Proceedings (OSTI)

The concept of improving the accuracy of numerical weather forecasts by targeting additional meteorological observations in areas where the initial condition error is suspected to grow rapidly has been the topic of numerous studies and field ...

Paul E. Bieringer; Peter S. Ray; Andrew J. Annunzio

2013-07-01T23:59:59.000Z

286

Evaluation of WRF-Predicted Near-Hub-Height Winds and Ramp Events over a Pacific Northwest Site with Complex Terrain  

Science Conference Proceedings (OSTI)

One challenge with wind-power forecasts is the accurate prediction of rapid changes in wind speed (ramps). To evaluate the Weather Research and Forecasting (WRF) model's ability to predict such events, model simulations, conducted over an area of ...

Qing Yang; Larry K. Berg; Mikhail Pekour; Jerome D. Fast; Rob K. Newsom; Mark Stoelinga; Catherine Finley

2013-08-01T23:59:59.000Z

287

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

E-Print Network (OSTI)

by the Energy & Environment Research Center at the University of North Dakota [1]. Each site has wind speed data.F., J.G. McGowan, and A.L. Rogers. Wind Energy Explained: Theory, Design and Application. John Wiley." Proceedings of British Wind Energy Association Workshop on the Influence of Trees on Wind Farm Energy Yields

Massachusetts at Amherst, University of

288

Mesoscale Atmospheric Modeling Using a High Horizontal Grid Resolution over a Complex Coastal Terrain and a Wine Region of South Africa  

Science Conference Proceedings (OSTI)

The Regional Atmospheric Modeling System (RAMS) was used to assess local air circulation patterns over the wine-producing Stellenbosch region of South Africa. Numerical simulations using four nested grids (25, 5, and 1 km, and 200 m of horizontal ...

V. Bonnardot; S. Cautenet

2009-02-01T23:59:59.000Z

289

Toward Development of Improved QPE in Complex Terrain Using Cloud-to-Ground Lightning Data: A Case Study for the 2005 Monsoon in Southern Arizona  

Science Conference Proceedings (OSTI)

The relationship between convective precipitation and cloud-to-ground (CG) lightning is examined over a study area in southwest Arizona and northwest Mexico. Using seasonal-to-daily and hourly time resolution, the National Climatic Data Center (...

Carlos Manuel Minjarez-Sosa; Christopher L. Castro; Kenneth L. Cummins; E. Philip Krider; Julio Waissmann

2012-12-01T23:59:59.000Z

290

Reasoning with rough description logics: An approximate concepts approach  

Science Conference Proceedings (OSTI)

The current research progress and the existing problems of uncertain or imprecise knowledge representation and reasoning in description logics are analyzed in this paper. Approximate concepts are introduced to description logics based on rough set theory, ... Keywords: Approximate concepts, Concepts, Description logics, Rough description logics, Rough set theory

Yuncheng Jiang; Ju Wang; Suqin Tang; Bao Xiao

2009-02-01T23:59:59.000Z

291

Rough surface mitigates electron and gas emission  

SciTech Connect

Heavy-ion beams impinging on surfaces near grazing incidence (to simulate the loss of halo ions) generate copious amounts of electrons and gas that can degrade the beam. We measured emission coefficients of {eta}{sub e} {le} 130 and {eta}{sub 0} {approx} 10{sup 4} respectively, with 1 MeV K{sup +} incident on stainless steel. Electron emission scales as {eta}{sub e} {proportional_to} 1/cos({theta}), where {theta} is the ion angle of incidence relative to normal. If we were to roughen a surface by blasting it with glass beads, then ions that were near grazing incidence (90{sup o}) on smooth surface would strike the rims of the micro-craters at angles closer to normal incidence. This should reduce the electron emission: the factor of 10 reduction, Fig. 1(a), implies an average angle of incidence of 62{sup o}. Gas desorption varies more slowly with {theta} (Fig. 1(b)) decreasing a factor of {approx}2, and along with the electron emission is independent of the angle of incidence on a rough surface. In a quadrupole magnet, electrons emitted by lost primary ions are trapped near the wall by the magnetic field, but grazing incidence ions can backscatter and strike the wall a second time at an azimuth where magnetic field lines intercept the beam. Then, electrons can exist throughout the beam (see the simulations of Cohen, HIF News 1-2/04). The SRIM (TRIM) Monte Carlo code predicts that 60-70% of 1 MeV K{sup +} ions backscatter when incident at 88-89{sup o} from normal on a smooth surface. The scattered ions are mostly within {approx}10{sup o} of the initial direction but a few scatter by up to 90{sup o}. Ion scattering decreases rapidly away from grazing incidence, Fig. 1(c ). At 62 deg. the predicted ion backscattering (from a rough surface) is 3%, down a factor of 20 from the peak, which should significantly reduce electrons in the beam from lost halo ions. These results are published in Phys. Rev. ST - Accelerators and Beams.

Molvik, A

2004-09-03T23:59:59.000Z

292

Reprinted from "Scattering and Surface Roughness," Z.-H. Gu ...  

Science Conference Proceedings (OSTI)

Page 1. Reprinted from "Scattering and Surface Roughness," Z.-H. Gu and AA Maradudin, Editors, Proc. SPIE 3141, 220-231 (1997) Page 2. Page 3 ...

2010-08-19T23:59:59.000Z

293

Contact mechanics for randomly rough surfaces  

E-Print Network (OSTI)

When two solids are squeezed together they will in general not make atomic contact everywhere within the nominal (or apparent) contact area. This fact has huge practical implications and must be considered in many technological applications. In this paper I briefly review basic theories of contact mechanics. I consider in detail a recently developed contact mechanics theory. I derive boundary conditions for the stress probability distribution function for elastic, elastoplastic and adhesive contact between solids and present numerical results illustrating some aspects of the theory. I analyze contact problems for very smooth polymer (PMMA) and Pyrex glass surfaces prepared by cooling liquids of glassy materials from above the glass transition temperature. I show that the surface roughness which results from the frozen capillary waves can have a large influence on the contact between the solids. The analysis suggest a new explanation for puzzling experimental results [L. Bureau, T. Baumberger and C. Caroli, arXiv:cond-mat/0510232] about the dependence of the frictional shear stress on the load for contact between a glassy polymer lens and flat substrates. I discuss the possibility of testing the theory using numerical methods, e.g., finite element calculations.

Bo N. J. Persson

2006-03-30T23:59:59.000Z

294

AIM-94-0800 Effect of Initial Ice Roughness  

E-Print Network (OSTI)

ice accretion phase. Using5close-up photography and videography Hansman has studied the initial phase of ice accretion. At warm temperatures, a runback zone aft of the rough zone is observed. WaterAIM-94-0800 Effect of Initial Ice Roughness on Airfoil Aerodynamics M. Bragg, M. Kerho and M

Bragg, Michael B.

295

Prediction of surface roughness using artificial neural network in lathe  

Science Conference Proceedings (OSTI)

In this study, the effect of tool geometry on surface roughness has been investigated in universal lathe. Machining process has been carried out on AISI 1040 steel in dry cutting condition using various insert geometry at depth of cut off 0.5 mm. At ... Keywords: artificial neural network, surface roughness, tool geometry

?akir Ta?demir; Süleyman Ne?eli; Ismail Sarita?; Süleyman Yaldiz

2008-06-01T23:59:59.000Z

296

Counterintuitive MCNPX Results for Scintillator Surface Roughness Effect  

Science Conference Proceedings (OSTI)

We have reported on our recent MCNPX simulation results of energy deposition for a group of 8 scintillation detectors, coupled with various rough surface patterns. The MCNPX results generally favored the detectors with various rough surface patterns. The observed MCNPX results are not fully explained by this work.

None

2012-08-12T23:59:59.000Z

297

Surface Water Vapor and Momentum Fluxes under Unstable Conditions from a Rugged-Complex Area  

Science Conference Proceedings (OSTI)

Measurements were made of the profiles of mean wind velocity, of temperature, and of specific humidity in the unstable atmospheric boundary layer over macro-rough terrain; these data were obtained from radiosonde observations in a calibrated ...

Wilfried Brutsaert; William P. Kustas

1987-01-01T23:59:59.000Z

298

Sources of Mesoscale Variability of Gravity Waves. Part I: Topographic Excitation  

Science Conference Proceedings (OSTI)

Aircraft measurements of winds and temperatures collected during the GASP program are used to study the effects of topography as a source of mesoscale variability. Variances of fluctuations at the mesoscale over rough terrain are enhanced up to ...

Gregory D. Nastrom; David C. Fritts

1992-01-01T23:59:59.000Z

299

Integral Scales for the Nocturnal Boundary Layer. Part II: Heat Budget, Transport and Energy Implications  

Science Conference Proceedings (OSTI)

In Part I, external forcings such as pressure gradient, terrain roughness and imposed cooling were used to forecast the thickness and strength of an exponentially-shaped (ES) nocturnal boundary layer (NBL) temperature profile. In Part II, it is ...

Roland B. Stull

1983-11-01T23:59:59.000Z

300

Surface Roughness Parameter Estimated with a Drag Technique  

Science Conference Proceedings (OSTI)

The surface roughness parameter, z0, can be estimated with different techniques. These techniques are analyzing the mean wind profile, estimating the surface drag coefficient and using the universal functions according to the Monin-Obukhov ...

Adrie F. G. Jacobs; Emile Schols

1986-11-01T23:59:59.000Z

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


301

Dark spot formation relative to ITO surface roughness for polyfluorene  

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

Dark spot formation relative to ITO surface roughness for polyfluorene Dark spot formation relative to ITO surface roughness for polyfluorene devices Title Dark spot formation relative to ITO surface roughness for polyfluorene devices Publication Type Journal Article Year of Publication 2004 Authors Liu, Gao, John B. Kerr, and Stephen G. Johnson Journal Synthetic Metals Volume 144 Pagination 1-6 Keywords dark spot, failure mechanism, interface, ito surface, oled Abstract The failure behaviors of ITO/PEDOT;PSS/polyfluorene/Al devices are different depending on the surface roughness of the sputtered ITO anode film. The spikes on ITO surface are responsible for the initial local shorts of the device, which develop into dark spots very quickly. Indium adsorption is observed on the polymer and Al cathode interface. A chemical etching procedure is used to smoothen the ITO surface without changing the ITO thickness and the sheet resistance. Devices made out of smooth ITO show minimum changes at polymer-cathode interface during operation.

302

Effective Roughness Length for Turbulent Flow over a Wavy Surface  

Science Conference Proceedings (OSTI)

A two-equation turbulence model is used to calculate the effective roughness length for two-dimensional turbulent flow over small amplitude, wavy surface topography. The governing equations are solved using the method of matched asymptotic ...

S. J. Jacobs

1989-07-01T23:59:59.000Z

303

Influence of surface roughness and waviness upon thermal contact resistance  

E-Print Network (OSTI)

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 ...

Yovanovich, M. Michael

1967-01-01T23:59:59.000Z

304

The effect of roughness on aerosol deposition in tubes  

E-Print Network (OSTI)

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/min. The relative roughness for each of the tubes tested are as follows: clean aluminum pipe and clean copper tube, F,/D = 10-4; fine sandpaper pipe, F,/D = 0.017-12 helical ridges per linear centimeter copper tube, F,/D = 0.046; coarse sandpaper pipe, F,/D = 0.065. Non-dimensional quantities were used to produce an empirical model relating roughness to aerosol penetration. The dependent variable, aerosol penetration, was encompassed in the non-dimensional deposition velocity (v,) and modeled as a function of the dependent variables, non-dimensional particle relaxation time (,c,) and relative roughness (&/D). In addition, a method was developed for estimating when to remove the sampling transport lines for cleaning due to the roughness within the transport line. The empirical correlation fits the data over the range of 0. I 6 to 112 L/min. For these conditions, the model deviated from the experimental data by less than 10% with one outlier which deviated by 20% for the coarse sandpaper pipe at a flow rate of 1 12 L/min. The correlation was used to show that the transport lines should be removed for cleaning or replacement once the pressure drop has exceeded 7.5 mm Hg. The experimental data has shown that the aerosol penetration decreases below 85% for an internal roughness comparable to this pressure drop limit. The correlation for aerosol penetration in transport lines with internal roughness presented should be a beneficial engineering tool for predicting the aerosol losses in sampling systems where roughness is a concern. The correlation should be a useful sub-model for aerosol penetration prediction computational tools as well.

Chavez, Mario Cesar

1997-01-01T23:59:59.000Z

305

Thermal Hydraulic Effect of Fuel Plate Surface Roughness  

Science Conference Proceedings (OSTI)

This study presents surface roughness measurements characteristic of the pre-film layer applied to a typical Advanced Test Reactor (ATR) fuel plate. This data is used to estimate the friction factor for thermal hydraulic flow calculations of a Gas Test Loop (GTL) system proposed for incorporation into ATR to provide a fast neutron flux environment for the testing of nuclear fuels and materials. To attain the required neutron flux, the design includes booster fuel plates clad with the same aluminum alloy as the ATR driver fuel and cooled with water supplied by the ATR primary coolant pumps. The objectives of this study are to: (1) determine the surface roughness of the protective boehmite layer applied to the ATR driver fuel prior to reactor operations in order to specify the machining tolerances for the surface finish on simulated booster fuel plates in a GTL hydraulic flow test model, and (2) assess the consequent thermal hydraulic impact due to surface roughness on the coolability of the booster fuel with a similar pre-film layer applied. While the maximum roughness of this coating is specified to be 1.6 µm (63 microinches), no precise data on the actual roughness were available. A representative sample coupon autoclaved with the ATR driver fuel to produce the pre-film coating was analyzed using optical profilometry. Measurements yielded a mean surface roughness of 0.53 µm (21 microinches). Results from a sensitivity study show that a ±15% deviation from the mean measured surface finish would have a minimal effect on coolant temperature, coolant flow rate, and fuel temperature. However, frictional losses from roughnesses greater than 1.5 µm (~60 microinches) produce a marked decrease in flow rate, causing fuel and coolant temperatures to rise sharply.

Donna Post Guillen; Timothy S. Yoder

2008-09-01T23:59:59.000Z

306

ANALYZING SURFACE ROUGHNESS DEPENDENCE OF LINEAR RF LOSSES  

SciTech Connect

Topographic structure on Superconductivity Radio Frequency (SRF) surfaces can contribute additional cavity RF losses describable in terms of surface RF reflectivity and absorption indices of wave scattering theory. At isotropic homogeneous extent, Power Spectrum Density (PSD) of roughness is introduced and quantifies the random surface topographic structure. PSD obtained from different surface treatments of niobium, such Buffered Chemical Polishing (BCP), Electropolishing (EP), Nano-Mechanical Polishing (NMP) and Barrel Centrifugal Polishing (CBP) are compared. A perturbation model is utilized to calculate the additional rough surface RF losses based on PSD statistical analysis. This model will not consider that superconductor becomes normal conducting at fields higher than transition field. One can calculate the RF power dissipation ratio between rough surface and ideal smooth surface within this field range from linear loss mechanisms.

Reece, Charles E. [JLAB; Kelley, Michael J. [JLAB, W& M College; Xu, Chen [JLAB, W& M College

2012-09-01T23:59:59.000Z

307

Hybrid rough sets intelligent system architecture for survival analysis  

Science Conference Proceedings (OSTI)

Survival analysis challenges researchers because of two issues. First, in practice, the studies do not span wide enough to collect all survival times of each individual patient. All of these patients require censor variables and cannot be analyzed without ... Keywords: Kaplan-Meier method, hybrid intelligent systems, reducts, rough sets, soft computing, survival analysis

Puntip Pattaraintakorn; Nick Cercone; Kanlaya Naruedomkul

2007-01-01T23:59:59.000Z

308

Approaches to Conflict Dynamics Based on Rough Sets  

Science Conference Proceedings (OSTI)

Conflict analysis and conflict resolution play an important role in negotiation during contract-management situations in many organizations. The issue here is how to model a combination of complex situations among agents where there are disagreements ... Keywords: Approximation space, conflict, conflict graph, conflict resolution, negotiation, requirements engineering, rough sets

Sheela Ramanna; James F. Peters; Andrzej Skowron

2007-01-01T23:59:59.000Z

309

RoSy: a rough knowledge base system  

Science Conference Proceedings (OSTI)

This paper presents a user-oriented view of ${\\mathcal R}o{\\mathcal S}y$, a ${\\mathcal R}{\\rm ough}$ Knowledge Base ${\\mathcal S}$ystem. The system tackles two problems not fully answered by previous research: the ability to define rough sets in terms ...

Robin Andersson; Aida Vitória; Jan Ma?uszy?ski; Jan Komorowski

2005-08-01T23:59:59.000Z

310

The Roughness Length for Heat of Sparse Vegetation  

Science Conference Proceedings (OSTI)

A dual-source model that solves the energy balance over vegetation and soil separately can be inverted to obtain the roughness length for heat z0h of a single-source model. Model parameters for the dual-source model were taken from previous ...

E. M. Blyth; A. J. Dolman

1995-02-01T23:59:59.000Z

311

RESPONSE ROBOTS RESPONSE ROBOTS  

Science Conference Proceedings (OSTI)

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

2012-06-06T23:59:59.000Z

312

Impact of Ice Crystal Roughness on Satellite Retrieved Cloud Properties  

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

Ice Crystal Roughness on Satellite Retrieved Cloud Properties Ice Crystal Roughness on Satellite Retrieved Cloud Properties P. Minnis 1 , P. W. Heck 2 , R. F. Arduini 3 , R. Palikonda 3 , J. K. Ayers 3 , M. M. Khaiyer 3 , P. Yang 4 , Y. Xie 4 3 Science Systems & Applications, Inc. Hampton, VA 1 NASA Langley Research Center Hampton, VA Current Cirrus Models Inadequate Cirrus cloud optical depths Ï„ (heights z e ) are often over (under) estimated when derived from solar reflectances. In situ data suggest smaller asymmetry factors, g, than used in most retrieval models. Multi-angle measurements point to smoother phase functions than for solid, smooth xtals. Calculations show that solid crystals with roughened facets or embedded bubbles --both observed in real cirrus particles-- yield smoother phase functions & smaller g

313

Heat transfer between elastic solids with randomly rough surfaces  

E-Print Network (OSTI)

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.

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

2009-08-27T23:59:59.000Z

314

Specification of Surface Roughness for Hydraulic Flow Test Plates  

Science Conference Proceedings (OSTI)

A study was performed to determine the surface roughness of the corrosion layer on aluminum clad booster fuel plates for the proposed Gas Test Loop (GTL) system to be incorporated into the Advanced Test Reactor (ATR) at the Idaho National Laboratory. A layer of boehmite (a crystalline, non-porous gamma-alumina hydrate) is typically pre-formed on the surface of the fuel cladding prior to exposure to reactor operation to prevent the uncontrolled buildup of corrosion product on the surface. A representative sample coupon autoclaved with the ATR driver fuel to produce the boehmite layer was analyzed using optical profilometry to determine the mean surface roughness, a parameter that can have significant impact on the coolant flow past the fuel plates. This information was used to specify the surface finish of mockup fuel plates for a hydraulic flow test model. The purpose of the flow test is to obtain loss coefficients describing the resistance of the coolant flow paths, which are necessary for accurate thermal hydraulic analyses of the water-cooled booster fuel assembly. It is recommended that the surface roughness of the boehmite layer on the fuel cladding be replicated for the flow test. While it is very important to know the order of magnitude of the surface roughness, this value does not need to be matched exactly. Maintaining a reasonable dimensional tolerance for the surface finish on each side of the 12 mockup fuel plates would ensure relative uniformity in the flow among the four coolant channels. Results obtained from thermal hydraulic analyses indicate that ±15% deviation from a surface finish (i.e., Ra) of 0.53 ìm would have a minimal effect on coolant temperature, coolant flow rate, and fuel temperature.

Donna Post Guillen; Timothy S. Yoder

2006-05-01T23:59:59.000Z

315

Effect of Grit Blasting on Substrate Roughness and Coating Adhesion  

Science Conference Proceedings (OSTI)

Statistically designed experiments were performed to compare the surface roughnesses produced by grit blasting A36/1020 steel with different abrasives. Grit blast media, blast pressure, and working distance were varied using a Box-type statistical design of experiment (SDE) approach. The surface textures produced by four metal grits (HG16, HG18, HG25, and HG40) and three conventional grits (copper slag, coal slag, and chilled iron) were compared. Substrate roughness was measured using surface profilometry and correlated with operating parameters. The HG16 grit produced the highest surface roughness of all the grits tested. Aluminum and zinc-aluminum coatings were deposited on the grit-blasted substrates using a Twin-Wire Electric Arc (TWEA) process. Bond strength of the coatings was measured with a portable adhesion tester in accordance with ASTM standard D4541. The coatings on substrates roughened with steel grit exhibit superior bond strength to those on substrates prepared with conventional grit. For aluminum coatings sprayed onto surfaces prepared with the HG16 grit, the bond strength was most influenced by current, spray distance, and spray gun pressure (in that order). The highest bond strength for the zinc-aluminum coatings was attained on surfaces prepared using the metal grits.

Dominic Varacalle; Donna Guillen; Doug Deason; William Rhodaberger; Elliott Sampson

2006-09-01T23:59:59.000Z

316

Foam flow through a transparent rough-walled rock fracture  

SciTech Connect

This paper presents an experimental study of nitrogen, water, and aqueous foam flow through a transparent replica of a natural rough-walled rock fracture with a hydraulic aperture of roughly 30 {mu}m. It is established that single-phase flow of both nitrogen and water is well described by analogy to flow between parallel plates. Inertial effects caused by fracture roughness become important in single-phase flow as the Reynolds number approaches 1. Foam exhibits effective control of gas mobility. Foam flow resistances are approximately 10 to 20 times greater than those of nitrogen over foam qualities spanning from 0.60 to 0.99 indicating effective gas-mobility control. Because previous studies of foam flow have focused mainly upon unfractured porous media, little information is available about foam flow mechanisms in fractured media. The transparency of the fracture allowed flow visualization and demonstrated that foam rheology in fractured media depends upon bubble shape and size. Changes in flow behavior are directly tied to transitions in bubble morphology.

Kovscek, A.; Tretheway, D.; Radke, C. [and others

1995-07-01T23:59:59.000Z

317

Enhancing evolutionary instance selection algorithms by means of fuzzy rough set based feature selection  

Science Conference Proceedings (OSTI)

In recent years, fuzzy rough set theory has emerged as a suitable tool for performing feature selection. Fuzzy rough feature selection enables us to analyze the discernibility of the attributes, highlighting the most attractive features in the construction ... Keywords: Evolutionary algorithms, Feature selection, Instance selection, Nearest neighbor, Rough sets

Joaquín Derrac; Chris Cornelis; Salvador García; Francisco Herrera

2012-03-01T23:59:59.000Z

318

Research on operating parameters and energy consumption of cold store based on rough set theory  

Science Conference Proceedings (OSTI)

Rough set theory is applied to analyze the energy consumption of an industrial cold storage facility for the first time. The features of rough set theory in data extraction are analyzed. The operating parameters collected in a sample refrigerating plant ... Keywords: cold store, energy consumption, operating parameters, rough set

Jianyi Zhang; Ying Xu; Fei Chen

2009-08-01T23:59:59.000Z

319

The modified Beckmann-Kirchhoff scattering theory for rough surface analysis  

Science Conference Proceedings (OSTI)

This paper focusses on how reflectance models based on scattering theory and reported in the physics literature can be used for making estimates of surface roughness parameters using reflectance measurements obtained with a digital camera. We commence ... Keywords: BRDF measurements, Beckmann model, Physics-based reflectance models, Rough surface scattering, Roughness estimation

Hossein Ragheb; Edwin R. Hancock

2007-07-01T23:59:59.000Z

320

The apparent surface roughness of moving sand transported by wind  

E-Print Network (OSTI)

We present a comprehensive analytical model of aeolian sand transport in saltation. It quantifies the momentum transfer from the wind to the transported sand by providing expressions for the thickness of the saltation layer and the apparent surface roughness. These expressions are for the first time entirely derived from basic physical principles. The model further predicts the sand transport rate (mass flux) and the impact threshold shear velocity. We show that the model predictions are in very good agreement with experiments and numerical state of the art simulations of aeolian saltation.

Thomas Pähtz; Jasper F. Kok; Hans J. Herrmann

2011-11-05T23:59:59.000Z

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


321

File:Wind rough example.pdf | Open Energy Information  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search File Edit History Facebook icon Twitter icon » File:Wind rough example.pdf Jump to: navigation, search File File history File usage Metadata File:Wind rough example.pdf Size of this preview: 776 × 600 pixels. Go to page 1 2 Go! next page → next page → Full resolution ‎(1,650 × 1,275 pixels, file size: 196 KB, MIME type: application/pdf, 2 pages) File history Click on a date/time to view the file as it appeared at that time. Date/Time Thumbnail Dimensions User Comment current 18:03, 2 January 2014 Thumbnail for version as of 18:03, 2 January 2014 1,650 × 1,275, 2 pages (196 KB) Foteri (Talk | contribs) Category:Wind for Schools Portal CurriculaCategory:Wind for Schools Elementary School Curricula

322

Crack Surface Roughness in Three-Dimensional Random Fuse Networks  

SciTech Connect

Using large system sizes with extensive statistical sampling, we analyze the scaling properties of crack roughness and damage profiles in the three-dimensional random fuse model. The analysis of damage profiles indicates that damage accumulates in a diffusive manner up to the peak load, and localization sets in abruptly at the peak load starting from a uniform damage landscape. The global crack width scales as $W \\sim L^{0.5}$ and is consistent with the scaling of localization length $\\xi \\sim L^{0.5}$ used in the data collapse of damage profiles in the post-peak regime. This consistency between the global crack roughness exponent and the post-peak damage profile localization length supports the idea that the post-peak damage profile is predominantly due to the localization produced by the catastrophic failure, which at the same time results in the formation of the final crack. Finally, the crack width distributions can be collapsed for different system sizes and follow a log-normal distribution.

Nukala, Phani K [ORNL; Zapperi, Stefano [University of La Sapienza, Rome; Simunovic, Srdjan [ORNL

2006-01-01T23:59:59.000Z

323

Influence of roughness on near-field heat transfer between two plates  

E-Print Network (OSTI)

The surface roughness correction to the near-field heat transfer between two rough bulk materials is discussed by using second-order perturbation theory. The results allow for estimating the impact of surface roughness to the heat transfer in recent experiments between two plates and between a microsphere and a plate (using the Derjaguin approximation). Furthermore, we show that the proximity approximation for describing rough surfaces is valid for distances much smaller than the correlation length of the surface roughness even if the heat transfer is dominated by the coupling of surface modes.

Svend-Age Biehs; Jean-Jacques Greffet

2011-03-11T23:59:59.000Z

324

Prediction of a Flash Flood in Complex Terrain. Part I: A Comparison of Rainfall Estimates from Radar, and Very Short Range Rainfall Simulations from a Dynamic Model and an Automated Algorithmic System  

Science Conference Proceedings (OSTI)

Operational prediction of flash floods caused by convective rainfall in mountainous areas requires accurate estimates or predictions of the rainfall distribution in space and time. The details of the spatial distribution are especially critical ...

Thomas T. Warner; Edward A. Brandes; Juanzhen Sun; David N. Yates; Cynthia K. Mueller

2000-06-01T23:59:59.000Z

325

Water infiltration and intermittent flow in rough-walled fractures  

DOE Green Energy (OSTI)

Flow visualization experiments were conducted in transparent replicas of natural rough-walled fractures. The fracture was inclined to observe the interplay between capillary and gravity forces. Water was introduced into the fracture by a capillary siphon. Preferential flow paths were observed, where intermittent flow frequently occurred. The water infiltration experiments suggest that intermittent flow in fractures appears to be the rule rather than the exception. In order to investigate the mechanism causing intermittent flow in fractures, parallel plates with different apertures were assembled using lucite and glass. A medium-coarse-fine pore structure is believed to cause the intermittency in flow. Intermittent flow was successfully produced in the parallel plate experiments using the lucite plates. After several trials, intermittent flow was also produced in the glass plates.

Su, G.

1995-05-01T23:59:59.000Z

326

On relative permeability of rough-walled fractures  

DOE Green Energy (OSTI)

This paper presents a conceptual and numerical model of multiphase flow in fractures. The void space of real rough-walled rock fractures is conceptualized as a two-dimensional heterogeneous porous medium, characterized by aperture as a function of position in the fracture plane. Portions of a fracture are occupied by wetting and non-wetting phase, respectively, according to local capillary pressure and accessibility criteria. Phase occupancy and permeability are derived by assuming a parallel-plate approximation for suitably small subregions in the fracture plane. Wetting and non-wetting phase relative permeabilities are calculated by numerically simulating single phase flows separately in the wetted and non-wetted pore spaces. Illustrative examples indicate that relative permeabilities depend sensitively on the nature and range of spatial correlation between apertures. 30 refs., 7 figs., 1 tab.

Pruess, K.; Tsang, Y.W.

1989-01-01T23:59:59.000Z

327

Effects of the roughness characteristics on the wire tool surface for the electrical discharge machining properties  

Science Conference Proceedings (OSTI)

Wire electrical discharge machining (WEDM) has been investigated to obtain the better discharge machining properties of the removal rate and the surface roughness in a few decades. Recently, it revealed that the rough tool electrodes can improve the WEDM properties for some sort of materials. In this study, the rough wire electrodes using a wet blasting method was developed and evaluated the machining performance for the insulated Si{sub 3}N{sub 4} in the WEDM processes. As the results, it could not recognize the advantage of roughness wire electrode under the high-energy condition, but it found that the electro-conductive layer thickness became thinner in comparison with those of normal wires. On the contrary, it could be obtained the better surface roughness in the low energy condition. It was supposed that the roughed wire surface generates the homogeneous dispersion discharges on the workpiece.

Fukuzawa, Yasushi; Yamashita, Masahide; Mamuro, Hiroaki; Yamashita, Ken [Nagaoka University of Technology, Department of Mechanical Engineering, 1603-1 Kamitomioka-machi, Nagaoka, Niigata, 940-2188 (Japan); Ogata, Masayoshi [Macoho Co., Ltd. 525 Kanawa, Isurugi-machi, Nagaoka, Niigata 940-2032 JAPAN (Japan)

2011-01-17T23:59:59.000Z

328

ROUGH-TOOTHED DOLPHIN (Steno bredanensis): Northern Gulf of Mexico Stock  

E-Print Network (OSTI)

The rough-toothed dolphin is distributed worldwide in tropical to warm temperate waters (Leatherwood and Reeves 1983; Miyazaki and Perrin 1994). Rough-toothed dolphins occur in both oceanic and continental shelf waters in the northern Gulf of Mexico (Fulling et al. 2003; Mullin and Fulling, in review). Rough-toothed dolphins were seen in all seasons during GulfCet aerial surveys of the northern Gulf of Mexico between

Stock Definition; Geographic Range

2003-01-01T23:59:59.000Z

329

Abstract--Face Milling is today the most effective and productive manufacturing method for roughing and finishing large  

E-Print Network (OSTI)

Surface Roughness in Cnc Face Milling of Cobalt-Based Alloy (Stellite 6)", The International Journal

Aristomenis, Antoniadis

330

Classical and dominance-based rough sets in the search for genes under balancing selection  

Science Conference Proceedings (OSTI)

Since the time of Kimura’s theory of neutral evolution at molecular level the search for genes under natural selection is one of the crucial problems in population genetics. There exists quite a number of statistical tests designed for it, however, ... Keywords: ATM, BLM, RECQL, WRN, balancing selection, classical rough sets approach, dominance-based rough sets approach, natural selection, neutrality tests

Krzysztof A. Cyran

2010-01-01T23:59:59.000Z

331

Power Transformer Fault Diagnosis Based on Integrated of Rough Set Theory and Evidence Theory  

Science Conference Proceedings (OSTI)

When using chromatography data analysis in diagnosis of power transformer fault, fault information cannot be make full use, which can't effectively discover knowledge hidden in data. In this paper a method integreted of rough set theory and evidence ... Keywords: Rough Set, Evidence Theory, Power Transformer, Fault Diagnosis

Zhou Ai-Hua, Yao Yi, Song Hong, Zeng Xiao-Hui

2013-01-01T23:59:59.000Z

332

A Simple Formula for Estimation of the Roughness Length for Heat Transfer over Partly Vegetated Surfaces  

Science Conference Proceedings (OSTI)

A simple formula for computation of the effective roughness length z0Heff for heat transfer or rather for the parameter kB?1eff [=ln(z0Meff/z0Heff) with z0Meff = roughness length for momentum], which are needed in single-source models for evaluating ...

K. Blümel

1999-06-01T23:59:59.000Z

333

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

E-Print Network (OSTI)

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.

Svend-Age Biehs; Jean-Jacques Greffet

2011-03-11T23:59:59.000Z

334

Influence of Land Surface Roughness on Atmospheric Circulation and Precipitation: A Sensitivity Study with a General Circulation Model  

Science Conference Proceedings (OSTI)

The influence of land surface roughness on the large scale atmospheric circulation and rainfall was examined by comparing three sets of simulations made with a general circulation model in which the land surface roughness length, z0, was reduced ...

Y. C. Sud; J. Shukla; Y. Mintz

1988-09-01T23:59:59.000Z

335

Ocean Surface Roughness Spectrum in High Wind Condition for Microwave Backscatter and Emission Computations  

Science Conference Proceedings (OSTI)

Ocean surface roughness plays an important role in air–sea interaction and ocean remote sensing. Its primary contribution is from surface waves much shorter than the energetic wave components near the peak of the wave energy spectrum. Field ...

Paul A. Hwang; Derek M. Burrage; David W. Wang; Joel C. Wesson

2013-09-01T23:59:59.000Z

336

Large Eddy Simulation of Internal Boundary Layers Created by a Change in Surface Roughness  

Science Conference Proceedings (OSTI)

Turbulence in a ?-mesoscale internal boundary layer (IBL) formed by a discontinuous change in surface roughness has been investigated using a large eddy simulation (LES) model to explicitly treat turbulent transport. Two cases are examined: a ...

John W. Glendening; Ching-Long Lin

2002-05-01T23:59:59.000Z

337

A Mechanism for Local Dissipation of Internal Tides Generated at Rough Topography  

Science Conference Proceedings (OSTI)

Fine- and micro-structure observations indicate that turbulent mixing is enhanced within O(1) km above rough topography. Enhanced mixing is associated with internal wave breaking and, in many regions of the ocean, has been linked to the breaking ...

Maxim Nikurashin; Sonya Legg

2011-02-01T23:59:59.000Z

338

Roughness Lengths for Momentum and Heat Derived from Outdoor Urban Scale Models  

Science Conference Proceedings (OSTI)

Urban climate experimental results from the Comprehensive Outdoor Scale Model (COSMO) were used to estimate roughness lengths for momentum and heat. Two different physical scale models were used to investigate the scale dependence of the ...

M. Kanda; M. Kanega; T. Kawai; R. Moriwaki; H. Sugawara

2007-07-01T23:59:59.000Z

339

Method for Estimation of Surface Roughness and Similarity Function of Wind Speed Vertical Profile  

Science Conference Proceedings (OSTI)

This study is aimed at identifying and refining a method suitable to estimate the surface roughness length (z0) and the universal similarity function of the wind speed profile (?M) based on ultrasonic anemometer measurements carried out at only ...

Roberto Sozzi; Maurizio Favaron; Teodoro Georgiadis

1998-05-01T23:59:59.000Z

340

On Detection of a Wave Age Dependency for the Sea Surface Roughness  

Science Conference Proceedings (OSTI)

The wave age dependency of the nondimensional sea surface roughness (also called the Charnock parameter) is investigated with data from the new field measurement program at Rødsand in the Danish Baltic Sea. An increasing Charnock parameter with ...

B. Lange; H. K. Johnson; S. Larsen; J. Højstrup; H. Kofoed-Hansen; M. J. Yelland

2004-06-01T23:59:59.000Z

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


341

Assessment of Roughness Length Schemes Implemented within the Noah Land Surface Model for High Altitude Regions  

Science Conference Proceedings (OSTI)

Current land surface models still have difficulties with producing reliable surface heat fluxes and skin temperature (Tsfc) estimates for high altitude regions, which may be addressed via adequate parameterization of the roughness lengths for ...

Donghai Zheng; Rogier Van Der Velde; Zhongbo Su; Martijn J. Booij; Arjen Y. Hoekstra

342

Ocean Surface Roughness Spectrum in High Wind Condition for Microwave Backscatter and Emission Computations  

Science Conference Proceedings (OSTI)

Ocean surface roughness plays an important role in air-sea interaction and ocean remote sensing. Its primary contribution is from surface waves much shorter than the energetic wave components near the peak of the wave energy spectrum. Field ...

Paul A. Hwang; Derek M. Burrage; David W. Wang; Joel C. Wesson

343

Eddy-Induced Modulation of Turbulent Dissipation over Rough Topography in the Southern Ocean  

Science Conference Proceedings (OSTI)

Mesoscale eddies are universal features of the ocean circulation, yet the processes by which their energy is dissipated remain poorly understood. One hypothesis argues that the interaction of strong geostrophic flows with rough bottom topography ...

J. Alexander Brearley; Katy L. Sheen; Alberto C. Naveira Garabato; David A. Smeed; Stephanie Waterman

2013-11-01T23:59:59.000Z

344

Scintillometer-Based Estimates of Sensible Heat Flux Using Lidar-Derived Surface Roughness  

Science Conference Proceedings (OSTI)

The estimation of sensible heat flux, H, using large aperture scintillometer (LAS) under varying surface heterogeneity conditions was investigated. Surface roughness features characterized by variable topography and vegetation height were ...

Hatim M. E. Geli; Christopher M. U. Neale; Doyle Watts; John Osterberg; Henk A. R. De Bruin; Wim Kohsiek; Robert T. Pack; Lawrence E. Hipps

2012-08-01T23:59:59.000Z

345

Enhancement of vortex induced forces and motion through surface roughness control  

SciTech Connect

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).

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

2011-11-01T23:59:59.000Z

346

Effects of surface roughness and vortex generators on the LS(1)-0417MOD airfoil  

DOE Green Energy (OSTI)

An 18-inch constant-chord model of the LS(l)-0417MOD airfoil section was tested under two dimensional steady state conditions ate University 7{times}10 Subsonic Wind Tunnel. The objective was to document section lift and moment characteristics model and air flow conditions. Surface pressure data was acquired at {minus}60{degrees} through + 230{degrees} geometric angles of attack, at a nominal 1 million Reynolds number. Cases with and without leading edge grit roughness were investigated. The leading edge mulated blade conditions in the field. Additionally, surface pressure data were acquired for Reynolds numbers of 1.5 and 2.0 million, with and without leading edge grit roughness; the angle of attack was limited to a {minus}20{degrees} to 40{degrees} range. In general, results showed lift curve slope sensitivities to Reynolds number and roughness. The maximum lift coefficient was reduced as much as 29% by leading edge roughness. Moment coefficient showed little sensitivity to roughness beyond 50{degrees} angle of attack, but the expected decambering effect of a thicker boundary layer with roughness did show at lower angles. Tests were also conducted with vortex generators located at the 30% chord location on the upper surface only, at 1 and 1.5 million Reynolds numbers, with and without leading edge grit roughness. In general, with leading edge grit roughness applied, the vortex generators restored 85 percent of the baseline level of maximum lift coefficient but with a more sudden stall break and at a higher angle of attack than the baseline.

Reuss, R.L.; Hoffman, M.J.; Gregorek, G.M. [Ohio State Univ., Columbus, OH (United States)

1995-12-01T23:59:59.000Z

347

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

E-Print Network (OSTI)

On-going efforts to reduce aircraft drag through transition delay focus on understanding the process of boundary-layer transition from a physics-based perspective. For swept-wings subject to transition dominated by a stationary crossflow instability, one of the remaining challenges is understanding how freestream disturbances and surface features such as surface roughness create the initial amplitudes for unstable waves. These waves grow, modify the mean flow and create conditions for secondary instabilities to occur, which in turn ultimately lead to transition. Computational methods that model the primary and secondary instability growth can accurately model disturbance evolution as long as appropriate initial conditions are supplied. Additionally, transition delay using discrete roughness arrays that exploit known sensitivities to surface roughness has been demonstrated in flight and wind tunnel testing; however, inconsistencies in performance from the two test platforms indicate further testing 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 of roughness height and spacing. Micron-sized, circular roughness elements were applied near the leading edge of the ASU(67)-0315 model installed at an angle of attack of -2.9 degrees in the Klebanoff-Saric Wind Tunnel. Extensive flow quality measurements show turbulence intensities less than 0.02% over the speed range of interest. A survey of multiple roughness heights for the most unstable and control wavelengths and Reynolds numbers of 2.4 x 10? 2.8 x 10? and 3.2 x 10? was completed for chord locations of 10%, 15% and 20%. When care was taken to measure in the region of linear stability, it was found that the disturbance amplitude varies almost linearly with roughness height. Naphthalene flow visualization indicates that moderate changes in already-low freestream turbulence levels can have a significant impact on transition behavior.

Hunt, Lauren Elizabeth

2011-12-01T23:59:59.000Z

348

Simulation of surface roughness during the formation of thermal spray coatings  

SciTech Connect

The formation of a thermal spray coating was analyzed to identify methods to reduce the surface roughness of the coating. A new methodology was developed which uses a string of equally spaced node points to define the shape of the coating surface and to track the shape change as the thermal spray mass is deposited. This allows the calculation of arbitrary shapes for the coating surface which may be very complex. The model simulates the stochastic deposition of a large number of thermal spray droplets, where experimental data is used for the mass flux distribution on the target surface. This data shows that when the thermal spray mass impinges on the target surface, a large fraction of it (over-spray) splashes off the target and is re-deposited with a small spray angle, resulting in a large coating roughness. This analysis was used in a parameter study to identify methods for reducing the coating roughness. Effect of the shape of the profile for the pre-roughened substrate was found to be small. Decreasing the droplet size by a factor of 2 decreased the roughness by 13%. Increasing the spray angle for the over-spray by a factor of 2 decreased the roughness by 50%, and decreasing the amount of over- spray by a factor of 2 decreased the roughness by 51%.

Kanouff, M.P.

1996-07-01T23:59:59.000Z

349

Horizontal Grid Size Selection and its Influence on Mesoscale Model Simulations  

Science Conference Proceedings (OSTI)

The use of two-dimensional spectral analysis applied to terrain heights in order to determine characteristic terrain spatial scales and its subsequent use for the objective definition of an adequate grid size required to resolve terrain forcing ...

Rosa Salvador; Josep Calbó; Millán M. Millán

1999-09-01T23:59:59.000Z

350

CTDMPLUS: A Dispersion Model for Sources near Complex Topography. Part I: Technical Formulations  

Science Conference Proceedings (OSTI)

The Complex Terrain Dispersion Model (CTDMPLUS), a point-source, steady-state model for complex-terrain applications, is described. The model simulates the flow and plume distortion near user-selected, three-dimensional terrain features, yet ...

Steven G. Perry

1992-07-01T23:59:59.000Z

351

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

Science Conference Proceedings (OSTI)

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.

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

2008-08-01T23:59:59.000Z

352

An Architecture for Distributed Environment Sensing with Application to Robotic Cliff Exploration  

Science Conference Proceedings (OSTI)

Future planetary exploration missions will use cooperative robots to explore and sample rough terrain. To succeed robots will need to cooperatively acquire and share data. Here a cooperative multi-agent sensing architecture is presented and applied to ... Keywords: cooperative robots, data fusion, information theory, robot communication, visual exploration

Vivek A. Sujan; Steven Dubowsky; Terry Huntsberger; Hrand Aghazarian; Yang Cheng; Paul Schenker

2004-05-01T23:59:59.000Z

353

Optimal two-degree-of-freedom fuzzy control for locomotion control of a hydraulically actuated hexapod robot  

Science Conference Proceedings (OSTI)

Locomotion control of legged robots is a very challenging task because very accurate foot trajectory tracking control is necessary for stable walking. An electro-hydraulically actuated walking robot has sufficient power to walk on rough terrain and carry ... Keywords: Hydraulic actuator, One-step-ahead fuzzy control, Robot locomotion, Six-legged walking robot, Two-degree-of-freedom fuzzy control

Ranjit Kumar Barai; Kenzo Nonami

2007-04-01T23:59:59.000Z

354

Offshore Wind Turbines and Their Installation  

Science Conference Proceedings (OSTI)

Offshore winds tend to be higher, more constant and not disturbed by rough terrain, so there is a large potential for utilizing wind energy near to the sea. Compared with the wind energy converters onland, wind turbine components offshore will subject ... Keywords: renewable energy, wind power generation, offshore wind turbines, offshore installation

Liwei Li; Jianxing Ren

2010-01-01T23:59:59.000Z

355

Long range hopping mobility platform.  

SciTech Connect

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

Spletzer, Barry Louis; Fischer, Gary John

2003-03-01T23:59:59.000Z

356

Tailoring interfacial exchange coupling with low-energy ion beam bombardment: Tuning the interface roughness  

SciTech Connect

By ascertaining NiO surface roughness in a Ni{sub 80}Fe{sub 20}/NiO film system, we were able to correlate the effects of altered interface roughness from low-energy ion-beam bombardment of the NiO layer and the different thermal instabilities in the NiO nanocrystallites. From experiment and by modelling the temperature dependence of the exchange bias field and coercivity, we have found that reducing the interface roughness and changing the interface texture from an irregular to striped conformation enhanced the exchange coupling strength. Our results were in good agreement with recent simulations using the domain state model that incorporated interface mixing.

Lin, K.-W.; Shueh, C.; Huang, H.-R.; Hsu, H.-F. [Department of Materials Science and Engineering, National Chung Hsing University, Tiachung 402, Taiwan (China); Mirza, M.; Lierop, J. van [Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2 (Canada)

2012-03-19T23:59:59.000Z

357

Adhesive contact of rough surfaces: comparison between numerical calculations and analytical theories  

E-Print Network (OSTI)

We have employed a numerical procedure to analyze the adhesive contact between a soft elastic layer and a rough rigid substrate. The solution of the problem is obtained by calculating the Green's function which links the pressure distribution to the normal displacements at the interface. The problem is then formulated in the form of a Fredholm integral equation of the first kind with a logarithmic kernel, and the boundaries of the contact area are calculated by requiring that the energy of the system is stationary. The methodology has been employed to study the adhesive contact between an elastic semi-infinite solid and a randomly rough rigid profile with a self-affine fractal geometry. We show that, even in presence of adhesion, the true contact area still linearly depends on the applied load. The numerical results are then critically compared with the prediction of an extended version of the Persson's contact mechanics theory, able to handle anisotropic surfaces, as 1D interfaces. It is shown that, for any given load, Persson's theory underestimates the contact area of about 50% in comparison with our numerical calculations. We find that this discrepancy is larger than what is found for 2D rough surfaces in case of adhesionless contact. We argue that this increased difference might be explained, at least partially, by considering that Persson's theory is a mean field theory in spirit, so it should work better for 2D rough surfaces rather than for 1D rough surfaces. We also observe, that the predicted value of separation is in very good agreement with our numerical results as well as the exponent of the power spectral density of the contact pressure distribution and of the elastic displacement of the solid. Therefore, we conclude that Persson's theory captures almost exactly the main qualitative behavior of the rough contact phenomena.

Giuseppe Carbone; Michele Scaraggi; Ugo Tartaglino

2010-06-03T23:59:59.000Z

358

Kosterlitz-Thouless Transition in 4He Films Adsorbed to Rough Calcium Fluoride  

Science Conference Proceedings (OSTI)

Previous measurements in our lab have shown that the onset of superfluidity at the KT transition, typically seen as a sharp change in the frequency of a smooth-surface quartz crystal microbalance, becomes less identifiable in the presence of increasing surface roughness or disorder, while the peak in the dissipation is unchanged. Using a series of microbalances coated with increasingly rough CaF2, we have extended our measurements to lower 4He film coverages and thus lower temperatures. We find at lower 4He coverages that the presence of disorder on the substrate has a diminished effect on the frequency shift.

Luhman, D. R.; Hallock, R. B. [Laboratory of Low Temperature Physics, Department of Physics, University of Massachusetts, Amherst, 01003 (United States)

2006-09-07T23:59:59.000Z

359

Global Distribution of Ice Cloud Particle Shape and Roughness from PARASOL Satellite Measurements  

E-Print Network (OSTI)

The energy balance of the Earth is regulated in part by ice clouds, which both reflect shortwave solar radiation and absorb infrared radiation from the Earth. These clouds appear frequently worldwide, with up to 70% coverage in tropical regions. The microphysics of ice clouds determines their radiative properties, and is important for accurately predicting the role of ice clouds in Earth’s energy balance. However, describing the microphysics of ice clouds remains a challenging problem, especially with regard to the shape of ice particles and the degree of ice particle surface roughening. In-situ studies have found evidence for ice surface roughness and have found many complex ice geometries; however, these studies are limited spatially and temporally. An approach which allows large-scale analysis is to retrieve these properties via theoretical modeling using satellite observations of polarized reflectance from ice clouds, since polarized reflectance is sensitive to the shape and roughness of ice particles. The theoretical model requires the scattering properties of simulated ice particles. These properties are obtained for 10 different ice shapes and 17 different levels of surface roughness. Simulations are performed for 3 different effective ice particle diameters: 30, 60 and 90 ?m. Overall, the retrieved shape is dominated by the compact aggregate of columns. Although the exact composition of shapes varies from month to month, the compact aggregate of columns remains the most commonly retrieved shape. The retrieved roughness varies from moderately rough at ? = 0.1 to severely rough at ? = 0.5. Retrieved roughness varies more than shape, and smooth surfaced ice is most prominent in January. Tropical regions tend to have ice particles that are more roughened, while the midlatitudes and polar regions tend to have more smooth ice. In almost all cases, roughened ice represents > 60% of the total retrievals. The asymmetry parameter inferred from the retrieval of ice particle shape and roughness has a mean value near 0.77, with only small differences based on assumed ice effective diameter. The median value of the asymmetry parameter has a nearly constant value of approximately 0.75.

Cole, Benjamin

2013-08-01T23:59:59.000Z

360

A Fetch Dependent Model Of Sea Surface Roughness For Offshore Wind Power Utilisation  

E-Print Network (OSTI)

The sea surface roughness z 0 is usually determined from friction velocity u * with the Charnock relation as z 0 =z ch u * /g, where g is the gravitational acceleration and z ch an empirical parameter, which was meant to be a constant, but turned out to be site specific for sites with coastal influence. Several attempts to improve this relation aim on finding a power law between a non-dimensional sea surface roughness and a non-dimensional group describing the influence of the wave field. The Rdsand field measurement was used to test several proposed relations. A significant

Bernhard Lange; Jørgen Højstrup; Søren Larsen; Rebecca Barthelmie

2001-01-01T23:59:59.000Z

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


361

DHS-NIST-ASTM Robot Test Methods (v2011.1) BLANK ...  

Science Conference Proceedings (OSTI)

... Page 30 • Terrains: Sand (P) • Terrains ... IDENTIFIER PAN TILT ZOOM (OPT/DIG) COLOR I/RB/W NO YES VAR NO YES VAR FIXED AUTO -TIGHT ...

2013-02-04T23:59:59.000Z

362

NIST Global Standards Information WTO TBT Inquiry Point  

Science Conference Proceedings (OSTI)

... was included allowing manufacturers to certify all-terrain vehicles over a steady ... Manufacturers with only one "all-terrain vehicle exhaust emission ...

363

Automated approaches for extracting individual tree level forest information using high spatial resolution remotely sensed data  

E-Print Network (OSTI)

Laser Terrain Mapper (ALTM) unit, Inertial Measurement Unit (IMU) and Differential Global Positioning System (Laser Terrain Mapper (ALTM) unit, Differential Global Positioning System (DGPS) and Inertial Measurement

Lee, Jun Hak

2010-01-01T23:59:59.000Z

364

Rough Sets in the Interpretation of Statistical Tests Outcomes for Genes Under Hypothetical Balancing Selection  

Science Conference Proceedings (OSTI)

Detection of natural selection at the molecular level is one of the crucial problems in contemporary population genetics. There exists a number of statistical tests designed for it, however, the interpretation of the outcomes is often obscure, because ... Keywords: ATM, BLM, RECQL, WRN, natural selection, neutrality tests, rough sets

Krzysztof Cyran

2007-06-01T23:59:59.000Z

365

The Rough Guide to the iPad, 2nd edition  

Science Conference Proceedings (OSTI)

It's an eBook reader. It's a touch-screen computer. It's a games machine. It's a movie player. It's for browsing the web and sending emails. Whatever you think the Apple iPad is, "The Rough Guide to the iPad" will show you that it's so much more, and ...

Peter Buckley

2011-06-01T23:59:59.000Z

366

A Controller Design for the Khepera Robot: A Rough Set Approach  

Science Conference Proceedings (OSTI)

The Khepera robot belongs to the family of miniature mobile robots of the K-Team firm. It is used in a number of places for scientific and educational purposes. Considering its advantages (such as small size, precision of movement, ease of control), ... Keywords: Artificial intelligence, Khepera robot, control design, expert system, fuzzy systems, machine learning, rough sets

Zbigniew Suraj; James F. Peters; Piotr Grochowalski

2005-02-01T23:59:59.000Z

367

Discovering patterns of missing data in survey databases: An application of rough sets  

Science Conference Proceedings (OSTI)

Databases for data mining often have missing values. Missing data are often mistreated in data mining and valuable knowledge related to missing data is often overlooked. This study discusses patterns of missing data in survey databases. It proposes a ... Keywords: Association rules, Data mining, Knowledge discovery, Missing values, Rough sets, Rule induction, Survey

Hai Wang; Shouhong Wang

2009-04-01T23:59:59.000Z

368

Effect of Roughness as Determined by Atomic Force Microscopy on the Wetting Properties of PTFE Thin  

E-Print Network (OSTI)

Effect of Roughness as Determined by Atomic Force Microscopy on the Wetting Properties of PTFE Thin Engineering College of Mines and Earth Sciences University of Utah Salt Lake City, Utah 84112 and G. YAMAUCHI films has been investigated using atomic force microscopy (AFM) and contact angle goniometry. Surface

Drelich, Jaroslaw W.

369

Contribution of Boussinesq pressure and bottom roughness terms for open channel flows with shocks  

Science Conference Proceedings (OSTI)

For high-velocity flows accompanied with hydraulic jump, this paper attempts to evaluate the contribution of non-hydrostatic (i.e., Boussinesq) pressure term and the bottom roughness coefficient. To perform this analysis, we have solved the one-dimensional ... Keywords: high resolution, hydraulic jump, hydrostatic, modeling, shocks

Prasada Rao

2002-12-01T23:59:59.000Z

370

Stock Trading Using RSPOP: A Novel Rough Set-Based Neuro-Fuzzy Approach  

Science Conference Proceedings (OSTI)

This paper investigates the method of forecasting stock price difference on artificially generated price series data using neuro-fuzzy systems and neural networks. As trading profits is more important to an investor than statistical performance, this ... Keywords: Forecasting theory, fuzzy neural networks, rough set theory, stock market, time series

K. K. Ang; C. Quek

2006-09-01T23:59:59.000Z

371

A New Drag Relation for Aerodynamically Rough Flow over the Ocean  

Science Conference Proceedings (OSTI)

From almost 7000 near-surface eddy-covariance flux measurements over the sea, the authors deduce a new air–sea drag relation for aerodynamically rough flow:Here u* is the measured friction velocity, and UN10 is the neutral-stability wind speed at ...

Edgar L Andreas; Larry Mahrt; Dean Vickers

2012-08-01T23:59:59.000Z

372

Effective thermal conductivity of rough spherical packed beds Majid Bahrami *, M. Michael Yovanovich, J. Richard Culham  

E-Print Network (OSTI)

relationships. The present model accounts for the thermophysical properties of spheres and the gas, load-dimensional numerical analysis which makes the FEM modeling extremely expen- sive from the calculative point of view [3]. In addition, ther- mal contact resistance (TCR) of rough spheres must be fed into the software as boundary

Bahrami, Majid

373

Application of Particle Swarm Optimization technique for achieving desired milled surface roughness in minimum machining time  

Science Conference Proceedings (OSTI)

Face milling is a widely used machining operation to produce various components. The finished component depends not only on the dimensional accuracy but also on the surface finish. The present method of selection of machining parameters by trial and ... Keywords: Face milling, Machining parameters, Machining time, Particle Swarm Optimization, Surface roughness

S. Bharathi Raja; N. Baskar

2012-04-01T23:59:59.000Z

374

Combining rough set and case based reasoning for process conditions selection in camshaft grinding  

Science Conference Proceedings (OSTI)

Case Based Reasoning (CBR) is a novel paradigm that uses previous cases to solve new, unseen and different problems. However, redundant features may not only dramatically increase the case memory, but also make the case retrieval more time-consuming. ... Keywords: Camshaft grinding, Case based reasoning, Case evaluation, Case reclassify, Feature reduction, Genetic algorithm, Rough set

X. H. Zhang; Z. H. Deng; W. Liu; H. Cao

2013-04-01T23:59:59.000Z

375

Temporal and Spatial Aspects of Velocity Variance in the Urban Surface Roughness Layer  

Science Conference Proceedings (OSTI)

Data from six urban areas in a nationwide network of sites within the surface roughness layer are examined. It is found that the average velocity variances in time, derived by averaging the conventional variances from a network of n stations, are ...

Bruce B. Hicks; Elena Novakovskaia; Ronald J. Dobosy; William R. Pendergrass III; William J. Callahan

2013-03-01T23:59:59.000Z

376

Rough set-based approach for modeling relationship measures in product planning  

Science Conference Proceedings (OSTI)

Quality function deployment (QFD) provides a planning and problem-solving methodology that is widely renowned for translating customer requirements (CRs) into engineering characteristics (ECs) for new product development. As the first phase of QFD, product ... Keywords: Customer requirement, Engineering characteristic, Quality function deployment, Relationship measure, Rough set

Yan-Lai Li; Jia-Fu Tang; Kwai-Sang Chin; Xing-Gang Luo; Yi Han

2012-06-01T23:59:59.000Z

377

Exploring the boundary region of tolerance rough sets for feature selection  

Science Conference Proceedings (OSTI)

Of all of the challenges which face the effective application of computational intelligence technologies for pattern recognition, dataset dimensionality is undoubtedly one of the primary impediments. In order for pattern classifiers to be efficient, ... Keywords: Attribute reduction, Classification, Feature selection, Rough sets

Neil Mac Parthaláin; Qiang Shen

2009-05-01T23:59:59.000Z

378

The generic genetic algorithm incorporates with rough set theory - An application of the web services composition  

Science Conference Proceedings (OSTI)

Evolutionary computing (EC) techniques have been used traditionally used for solving challenging optimization problems. But the increase in data and information has reduced the performance capacity of the GA, but highlighted the cost of finding a solution ... Keywords: Generic, Genetic algorithm, Rough set, Web services, Web services composition

Wen-Yau Liang; Chun-Che Huang

2009-04-01T23:59:59.000Z

379

Uncertainty handling in navigation services using rough and fuzzy set theory  

Science Conference Proceedings (OSTI)

Navigation services, such as used in cars, are widely used nowadays. Many applications, positioning technologies and techniques have been developed to make navigation systems easier to use. However current navigation systems suffer from different aspects ... Keywords: fuzzy set theory, location based services, navigation services, rough set theory, spatio-temporal objects, uncertainty

Anahid Basiri; Pouria Amirian; Adam Winstanley; Colin Kuntzsch; Monika Sester

2012-11-01T23:59:59.000Z

380

Transformer fault diagnosis based on reasoning integration of rough set and fuzzy set and Bayesian optimal classifier  

Science Conference Proceedings (OSTI)

In accordance with intelligent complementary strategies, a new transformer fault diagnosis method is proposed based on rough set (RS) and fuzzy set (FS) and Bayesian optimal classifier in this paper. Through RS reduction, the diagnostic decision table ... Keywords: Bayesian optimal classifier, fault diagnosis, fuzzy set, information entropy, intelligent complementary, rough set, transformer

Hongsheng Su; Haiying Dong

2009-01-01T23:59:59.000Z

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


381

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

SciTech Connect

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.

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

382

Energy production rates in fluid mixtures of inelastic rough hard spheres  

E-Print Network (OSTI)

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.

Andrés Santos; Gilberto M. Kremer; Vicente Garzó

2009-10-29T23:59:59.000Z

383

The Resonator Impedance Model of Surface Roughness Applied to the LCLS Parameters  

E-Print Network (OSTI)

The resonator impedance model of surface roughness in a cylindrical beam tube, derived in Ref. 1, is compared to the inductive impedance model of Ref. 2. It is shown that for long, smooth bunches the two models both give an inductive response, that the e#ective inductance per length is proportional to the corrugation depth over the beam pipe radius, and that the absolute results also are comparable. For a non-smooth bunch shape, such as is found in the undulator region of the LCLS, however, the inductive impedance model is no longer valid; and the resonator model gives a non-inductive response, with the induced energy spread decreasing much more slowly with increasing bunch length than for a smooth distribution. When applied to the actual bunch shape and parameters in the LCLS, the resonator model predicts that, to remain within tolerances for induced energy spread, the beam tube roughness must be kept to 10 nm. Further calculations suggest, however, that if the period-to-depth aspect ratio of the surface features is large, #as has been found in recent measurements of polished beam tube surfaces#, then the wake#eld e#ect may be greatly suppressed, and the roughness tolerance greatly increased.

Karl L.F. Bane; Alexander Novokhatskii

1999-01-01T23:59:59.000Z

384

Improving the Noah Land Surface Model in Arid Regions with an Appropriate Parameterization of the Thermal Roughness Length  

Science Conference Proceedings (OSTI)

Daytime land surface temperatures in arid and semiarid regions are typically not well simulated in current land surface models (LSMs). This study first evaluates the importance of parameterizing the thermal roughness length (z0h) to model the ...

Yingying Chen; Kun Yang; Degang Zhou; Jun Qin; Xiaofeng Guo

2010-08-01T23:59:59.000Z

385

A New Scheme for Effective Roughness Length and Effective Zero-Plane Displacement in Land Surface Models  

Science Conference Proceedings (OSTI)

Based on the similarity theory of the atmospheric surface layer and the flux conservation and mass conservation laws, a new scheme for determining the effective roughness length (ERL) and the effective zero-plane displacement (EZPD) for a ...

Zhong Zhong; Wei Lu; Shuai Song; Yaocun Zhang

2011-12-01T23:59:59.000Z

386

Influences of Sea Surface Temperature Gradients and Surface Roughness Changes on the Motion of Surface Oil: A Simple Idealized Study  

Science Conference Proceedings (OSTI)

The authors' modeling shows that changes in sea surface temperature (SST) gradients and surface roughness between oil-free water and oil slicks influence the motion of the slick. Physically significant changes occur in surface wind speed, surface ...

Yangxing Zheng; Mark A. Bourassa; Paul Hughes

2013-07-01T23:59:59.000Z

387

A Self-Contained Sector-Scanning Sonar for Bottom Roughness Observations as Part of Sediment Transport Studies  

Science Conference Proceedings (OSTI)

Studies and models of sediment transport in the bottom boundary layer require knowledge of the bottom roughness as a parameter affecting the suspension and transport of sediment. Knowledge of this has often been quite imprecise since measurements ...

J. D. Irish; J. F. Lynch; P. A. Traykovski; A. E. Newhall; K. Prada; A. E. Hay

1999-11-01T23:59:59.000Z

388

An Improvement of Roughness Height Parameterization of the Surface Energy Balance System (SEBS) over the Tibetan Plateau  

Science Conference Proceedings (OSTI)

Roughness height for heat transfer is a crucial parameter in the estimation of sensible heat flux. In this study, the performance of the Surface Energy Balance System (SEBS) has been tested and evaluated for typical land surfaces on the Tibetan ...

Xuelong Chen; Zhongbo Su; Yaoming Ma; Kun Yang; Jun Wen; Yu Zhang

2013-03-01T23:59:59.000Z

389

Effects of grit roughness and pitch oscillations on the S814 airfoil  

DOE Green Energy (OSTI)

Horizontal-axis wind turbine rotors experience unsteady aerodynamics when the rotor is yawed, when rotor blades pass through the support tower wake, and when the wind is gusting. An understanding of this unsteady behavior is necessary to assist in the design of new rotor airfoils. The rotors also experience performance degradation due to surface roughness. These surface irregularities are due to the accumulation of insect debris, ice, and/or the aging process. Wind tunnel studies that examine both the steady and unsteady behavior of airfoils can help define pertinent flow phenomena, and the resultant data can also be used to validate analytical computer codes. An S814 airfoil model was tested in The Ohio State University Aeronautical and Astronautical Research Laboratory (OSU/AARL) 3 X 5 subsonic wind tunnel (3 X 5) under steady flow with both stationary model conditions and pitch oscillations. To study the extent of performance loss due to surface roughness, a leading edge grit roughness pattern (LEGR) was used to simulate leading edge contamination. After baseline cases were completed, the LEGR was applied for both steady state and model pitch oscillation cases. The Reynolds numbers for steady state conditions were 0.75, 1, 1.25 and 1.5 million, while the angle of attack ranged from -20{degrees} to +40{degrees}. While the model underwent pitch oscillations, data were acquired at Reynolds numbers of 0.75, 1, 1.25, and 1.5 million, at frequencies of 0.6, 1.2, and 1.8 Hz. Two sine wave forcing functions {+-}5.5{degrees} and {+-}10{degrees}, were used; at mean angles of attack of 8{degrees}, 14{degrees}, and 20{degrees}. For purposes herein, any reference to unsteady conditions means the model was in pitch oscillation.

Janiszewska, J.M.; Ramsay, R.R.; Hoffmann, M.J.; Gregorek, G.M. [Ohio State Univ., Columbus, OH (United States)

1996-07-01T23:59:59.000Z

390

EFFECTS OF GRAPHITE SURFACE ROUGHNESS ON BYPASS FLOW COMPUTATIONS FOR AN HTGR  

SciTech Connect

Bypass flow in a prismatic high temperature gas reactor (HTGR) occurs between graphite blocks as they sit side by side in the core. Bypass flow is not intentionally designed to occur in the reactor, but is present because of tolerances in manufacture, imperfect installation and expansion and shrinkage of the blocks from heating and irradiation. It is desired to increase the knowledge of the effects of such flow, which has been estimated to be as much as 20% of the total helium coolant flow. Computational fluid dynamic (CFD) simulations can provide estimates of the scale and impacts of bypass flow. Previous CFD calculations have examined the effects of bypass gap width, level and distribution of heat generation and effects of shrinkage. The present contribution examines the effects of graphite surface roughness on the bypass flow for different relative roughness factors on three gap widths. Such calculations should be validated using specific bypass flow measurements. While such experiments are currently underway for the specific reference prismatic HTGR design for the next generation nuclear plant (NGNP) program of the U. S. Dept. of Energy, the data are not yet available. To enhance confidence in the present calculations, wall shear stress and heat transfer results for several turbulence models and their associated wall treatments are first compared for flow in a single tube that is representative of a coolant channel in the prismatic HTGR core. The results are compared to published correlations for wall shear stress and Nusselt number in turbulent pipe flow. Turbulence models that perform well are then used to make bypass flow calculations in a symmetric onetwelfth sector of a prismatic block that includes bypass flow. The comparison of shear stress and Nusselt number results with published correlations constitutes a partial validation of the CFD model. Calculations are also compared to ones made previously using a different CFD code. Results indicate that increasing surface roughness increases the maximum fuel and helium temperatures as do increases in gap width. However, maximum coolant temperature variation due to increased gap width is not changed by surface roughness.

Rich Johnson; Yu-Hsin Tung; Hiroyuki Sato

2011-07-01T23:59:59.000Z

391

Experimental investigation of electric field distributions in a chaotic 3D microwave rough billiard  

E-Print Network (OSTI)

We present the first experimental study of the electric field distributions E_N of a three-dimensional (3D) microwave chaotic rough billiard with the translational symmetry. The translational symmetry means that the cross-section of the billiard is invariant under translation along z direction. The 3D electric field distributions were measured up to the level number N = 489. In this way the experimental spatial correlation functions C_{N,p}(x,s) ~ were found and compared with the theoretical ones. The experimental results for higher two-dimensional level number N_{|} appeared to be in good agreement with the theoretical predictions.

Oleg Tymoshchuk; Nazar Savytskyy; Oleh Hul; Szymon Bauch; Leszek Sirko

2009-03-17T23:59:59.000Z

392

Artificial Neural Network and Rough Set for HV Bushings Condition Monitoring  

E-Print Network (OSTI)

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.

Mpanza, LJ

2011-01-01T23:59:59.000Z

393

Ant Colony Optimization of Rough Set for HV Bushings Fault Detection  

E-Print Network (OSTI)

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.

Mpanza, J L

2011-01-01T23:59:59.000Z

394

Codeposition on hot CVD surfaces: Particle dynamics and deposit roughness interactions  

SciTech Connect

To capture in a tractable manner essential coupling effects in CVD systems when particles generated in thermal boundary layers also deposit, a film theory was developed that predicts simultaneous vapor and particle deposition rates at a hot deposition surface. The codeposition rate prediction method also calculates for the first time the corresponding solid deposit roughness using recently published results of particle-level simulations. For the numerical illustrations, the growth of TiO{sub 2}(s) films by the codeposition of titanium tetra-isopropoxide vapor and film-nucleated/grown TiO{sub 2} particles (generated in the thermal boundary layer) was considered. Experimental rate data for this system are available. The continuum and particle-level simulation methods provide: the interplay of vapor precursor kinetics, particle nucleation, growth, coagulation and diffusion in determining the complex ``structure`` of such multiphase chemically reacting boundary layers; wall deposition rates of both surviving vapors and film-nucleated particles; and the ``self-consistent`` microstructure (surface roughness) of the resulting solid deposit. Timely and tractable generalizations are discussed in the light of recent results for the transport properties and stability of ``fractal-like`` aggregated particles.

Tandon, P.; Rosner, D.E. [Yale Univ., New Haven, CT (United States)

1996-06-01T23:59:59.000Z

395

Adhesive contact of rough surfaces: comparison between numerical calculations and analytical theories  

E-Print Network (OSTI)

We have employed a numerical procedure to analyze the adhesive contact between a soft elastic layer and a rough rigid substrate. The solution of the problem is obtained by calculating the Green's function which links the pressure distribution to the normal displacements at the interface. The problem is then formulated in the form of a Fredholm integral equation of the first kind with a logarithmic kernel, and the boundaries of the contact area are calculated by requiring that the energy of the system is stationary. The methodology has been employed to study the adhesive contact between an elastic semi-infinite solid and a randomly rough rigid profile with a self-affine fractal geometry. We show that, even in presence of adhesion, the true contact area still linearly depends on the applied load. The numerical results are then critically compared with the prediction of an extended version of the Persson's contact mechanics theory, able to handle anisotropic surfaces, as 1D interfaces. It is shown that, for any ...

Carbone, Giuseppe; Tartaglino, Ugo; 10.1140/epje/i2009-10508-5

2010-01-01T23:59:59.000Z

396

A study of pitch oscillation and roughness on airfoils used for horizontal axis wind turbines  

DOE Green Energy (OSTI)

Under subcontract XF-1-11009-3 the Ohio State University Aeronautical and Astronautical Research Laboratory (OSU/AARL) with the National Renewable Energy Laboratory (NREL) developed an extensive database of empirical aerodynamic data. These data will assist in the development of analytical models and in the design of new airfoils for wind turbines. To accomplish the main objective, airfoil models were designed, built and wind tunnel tested with and without model leading edge grit roughness (LEGR). LEGR simulates surface irregularities due to the accumulation of insect debris, ice, and/or the aging process. This report is a summary of project project activity for Phase III, which encompasses the time period from September 17, 1 993 to September 6, 1 994.

Gregorek, G.M.; Hoffmann, M.J.; Ramsay, R.R.; Janiszewska, J.M. [Ohio State Univ., Columbus, OH (United States)

1995-12-01T23:59:59.000Z

397

Experimental and theoretical studies of friction and heat transfer in rough passages  

SciTech Connect

This document discusses activities during this reporting period. A paper based on the results presented in the first final report (DOE/CE/90029-2) and entitled The Role of Transition in Determining Friction and Heat Transfer in Smooth and Rough Passages'' was published in the October issue (Volume 33) of the International Journal of Heat and Mass Transfer. Beginning with the minimum objectives established at the outset of the period covered by this report, the general picture can be summed up as follows: detailed heat transfer and pressure drop (with and without heating) measurements with the smooth tube, fabrication of the eleven (enhanced tube) heat transfer test sections, tests with two of the three Hitachi tubes, and the construction of the liquid test facility were completed. In short, the minimum objectives were, for the most part, accomplished satisfactorily. 6 refs., 10 figs., 1 tab.

Obot, N.T.; Esen, E.B.

1990-12-01T23:59:59.000Z

398

Numerical study of roughness distributions in nonlinear models of interface growth  

E-Print Network (OSTI)

We analyze the shapes of roughness distributions of discrete models in the Kardar, Parisi and Zhang (KPZ) and in the Villain, Lai and Das Sarma (VLDS) classes of interface growth, in one and two dimensions. Three KPZ models in d=2 confirm the expected scaling of the distribution and show a stretched exponential tail approximately as exp[-x^(0.8)], with a significant asymmetry near the maximum. Conserved restricted solid-on-solid models belonging to the VLDS class were simulated in d=1 and d=2. The tail in d=1 has the form exp(-x^2) and, in d=2, has a simple exponential decay, but is quantitatively different from the distribution of the linear fourth-order (Mullins-Herring) theory. It is not possible to fit any of the above distributions to those of 1/f^\\alpha noise interfaces, in contrast with recently studied models with depinning transitions.

Fabio D. A. Aarão Reis

2005-08-09T23:59:59.000Z

399

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

E-Print Network (OSTI)

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.

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

2009-10-06T23:59:59.000Z

400

Fluid flow analysis in a rough fracture (type II) using complex networks and lattice Boltzmann method  

E-Print Network (OSTI)

Complexity of fluid flow in a rough fracture is induced by the complex configurations of opening areas between the fracture planes. In this study, we model fluid flow in an evolvable real rock joint structure, which under certain normal load is sheared. In an experimental study, information regarding about apertures of the rock joint during consecutive 20 mm displacements and fluid flow (permeability) in different pressure heads have been recorded by a scanner laser. Our aim in this study is to simulate the fluid flow in the mentioned complex geometries using the lattice Boltzmann method (LBM), while the characteristics of the aperture field will be compared with the modeled fluid flow permeability To characterize the aperture, we use a new concept in the graph theory, namely: complex networks and motif analysis of the corresponding networks. In this approach, the similar aperture profile along the fluid flow direction is mapped in to a network space. The modeled permeability using the LBM shows good correlat...

Ghaffari, H; Sharifzadeh, M; Young, R P

2011-01-01T23:59:59.000Z

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


401

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

DOE Patents (OSTI)

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.

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

2011-06-07T23:59:59.000Z

402

Chamber Surface Roughness and Electron Cloud for the Advanced Photon Source Superconducting Undulator  

E-Print Network (OSTI)

The electron cloud is a possible heat source in the superconducting undulator (SCU) designed for the Advanced Photon Source (APS), a 7-GeV electron synchrotron radiation source at Argonne National Laboratory. In electron cloud generation extensive research has been done, and is continuing, to understand the secondary electron component. However, little work has been done to understand the parameters of photoemission in the accelerator environment. To better understand the primary electron generation in the APS; a beamline at the Australian Light Source synchrotron was used to characterize two samples of the Al APS vacuum chamber. The total photoelectron yield and the photoemission spectra were measured. Four parameters were varied: surface roughness, sample temperature, incident photon energy, and incident photon angle, with their results presented here.

Boon, Laura

2013-01-01T23:59:59.000Z

403

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

DOE Patents (OSTI)

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.

Li, Ting (Ventura, CA)

2011-04-26T23:59:59.000Z

404

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

SciTech Connect

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.

Li, Ting

2013-08-13T23:59:59.000Z

405

Surface roughness effects on the solar reflectance of cool asphalt shingles  

Science Conference Proceedings (OSTI)

We analyze the solar reflectance of asphalt roofing shingles that are covered with pigmented mineral roofing granules. The reflecting surface is rough, with a total area approximately twice the nominal area. We introduce a simple analytical model that relates the 'micro-reflectance' of a small surface region to the 'macro-reflectance' of the shingle. This model uses a mean field approximation to account for multiple scattering effects. The model is then used to compute the reflectance of shingles with a mixture of different colored granules, when the reflectances of the corresponding mono-color shingles are known. Simple linear averaging works well, with small corrections to linear averaging derived for highly reflective materials. Reflective base granules and reflective surface coatings aid achievement of high solar reflectance. Other factors that influence the solar reflectance are the size distribution of the granules, coverage of the asphalt substrate, and orientation of the granules as affected by rollers during fabrication.

Akbari, Hashem; Berdahl, Paul; Akbari, Hashem; Jacobs, Jeffry; Klink, Frank

2008-02-17T23:59:59.000Z

406

Effects of grit roughness and pitch oscillations on the LS(1)-0417MOD airfoil  

DOE Green Energy (OSTI)

Horizontal axis wind turbine rotors experience unsteady aerodynamics due to wind shear when the rotor is yawed, when rotor blades pass through the support tower wake, and when the wind is gusting. An understanding of this unsteady behavior is necessary to assist in the calculations of rotor performance and loads. The rotors also experience performance degradation caused by surface roughness. These surface irregularities are due to the accumulation of insect debris, ice, and/or the aging process. Wind tunnel studies that examine both the steady and unsteady behavior of airfoils can help define pertinent flow phenomena, and the resultant data can be used to validate analytical computer codes. An LS(l)-0417MOD airfoil model was tested in The Ohio State University Aeronautical and Astronautical Research Laboratory (OSU/AARL) 3{times}5 subsonic wind tunnel (3{times}5) under steady flow and stationary model conditions, as well as with the model undergoing pitch oscillations. To study the possible extent of performance loss due to surface roughness, a standard grit pattern (LEGR) was used to simulate leading edge contamination. After baseline cases were completed, the LEGR was applied for both steady state and model pitch oscillation cases. The Reynolds numbers for steady state conditions were 0.75, 1, 1.25, and 1.5 million, while the angle of attack ranged from {minus}20{degrees} to +40{degrees}. With the model undergoing pitch oscillations, data were acquired at Reynolds numbers of 0.75, 1, 1.25, and 1.5 million, at frequencies of 0.6, 1.2, and 1.8 Hz. Two sine wave forcing functions were used, {plus_minus} 5.5%{degrees} and {plus_minus} 10{degrees}, at mean angles of attack of 8{degrees}, 14{degrees}, and 20{degrees}. For purposes herein, any reference to unsteady conditions foil model was in pitch oscillation about the quarter chord.

Janiszewska, J.M.; Ramsay, R.R.; Hoffman, M.J.; Gregorek, G.M. [Ohio State Univ., Columbus, OH (United States)

1996-01-01T23:59:59.000Z

407

Effects of grit roughness and pitch oscillations on the LS(1)-0421MOD airfoil  

DOE Green Energy (OSTI)

An LS(1)-0421 MOD airfoil model was tested in The Ohio State University Aeronautical and Astronautical Research Laboratory (OSU/AARL) 3{times}5 subsonic wind tunnel (3{times}5) under steady flow and stationary model conditions, and also with the model undergoing pitch oscillations. In order to study the possible extent of performance loss due to surface roughness, a leading edge grit roughness (LEGR) pattern was developed to simulate leading edge contamination. After baseline cases were completed, the LEGR was applied for both steady state and model pitch oscillation cases. The Reynolds numbers for steady state conditions were 0.75, 1, and 1.25 million, while the angle of attack ranged from {minus}10{degrees} to +40{degrees}. With the model undergoing pitch oscillations, data was acquired at Reynolds numbers of 0.75, 1, 1.25, and 1.5 million, at frequencies of 0.6, 1.2, and 1.8 Hz. Two sine wave forcing functions were used; {plus_minus} 5.5{degrees} and {plus_minus} 10{degrees}, at mean angles of attack of 8{degrees}, 14{degrees}, and 20{degrees}. For this report, unsteady conditions refer to the model in pitch oscillation. In general, the maximum unsteady lift coefficient was from 10% to 50% higher than the steady state maximum lift coefficient. Variation in the quarter chord pitching moment coefficient was nearly two times greater than steady state values at high angles of attack. These findings indicate the importance of considering the unsteady flow behavior occurring in wind turbine operation for accurate load estimates.

Reuss, R.L.; HOffman, M.J.; Gregorek, G.M. [Ohio State Univ., Columbus, OH (United States)

1995-12-01T23:59:59.000Z

408

Effects of grit roughness and pitch oscillations on the S815 airfoil  

DOE Green Energy (OSTI)

Horizontal axis wind turbine rotors experience unsteady aerodynamics due to wind shear when the rotor is yawed, when rotor blades pass through the support tower wake, and when the wind is gusting. An understanding of this unsteady behavior is necessary to assist in the calculation of rotor performance and loads. The rotors also experience performance degradation due to surface roughness. These surface irregularities are cause by the accumulation of insect debris, ice, and the aging process. Wind tunnel studies that examine both the steady and unsteady behavior of airfoils can help define pertinent flow phenomena, and the resultant data can be used to validate analytical computer codes. A S815 airfoil model was tested in The Ohio State University Aeronautical and Astronautical Research Laboratory (OSU/AARL) 3 x 5 subsonic wind tunnel (3 x 5) under steady flow and stationary model conditions, as well as with the model undergoing pitch oscillations. To study the possible extent of performance loss due to surface roughness, a standard grit pattern (LEGR) was used to simulate leading edge contamination. After baseline cases were completed, the LEGR was applied for both steady state and model pitch oscillation cases. The Reynolds numbers used for steady state conditions were 0.75, 1, 1.25, and 1.4 million, while the angle of attack ranged from {minus}20{degree} to +40{degree}. With the model undergoing pitch oscillations, data were acquired at Reynolds numbers of 0.75, 1, 1.25, and 1.4 million, at frequencies of 0.6, 1.2, and 1.8 Hz. Two sine wave forcing functions were used; {+-}5.5{degree} and {+-}10{degree}, at mean angles of attack of 8{degree}, 14{degree}, and 20{degree}. For purposes herein, any reference to unsteady conditions means that the model was in pitch oscillation about the quarter chord.

Reuss Ramsay, R.; Hoffman, M.J.; Gregorek, G.M. [Ohio State Univ., Columbus, OH (United States)

1996-07-01T23:59:59.000Z

409

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

Science Conference Proceedings (OSTI)

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.

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

410

Effects of grit roughness and pitch oscillations on the S801 airfoil  

DOE Green Energy (OSTI)

Horizontal axis wind turbine rotors experience unsteady aerodynamics due to wind shear when the rotor is yawed, when rotor blades pass through the support tower wake, and when the wind is gusting. An understanding of this unsteady behavior is necessary to assist in the calculation of rotor performance and loads. The rotors also experience performance degradation due to surface roughness. These surface irregularities are due to the accumulation of insect debris, ice, and the aging process. Wind tunnel studies that examine both the steady and unsteady behavior of airfoils can help define pertinent flow phenomena, and the resultant data can be used to validate analytical computer codes. A S801 airfoil model was tested in The Ohio State University Aeronautical and Astronautical Research Laboratory (OSU/AARL) 3x5 subsonic wind tunnel (3x5) under steady flow and stationary model conditions, as well as with the model undergoing pitch oscillations. To study the possible extent of performance loss due to surface roughness, a standard grit pattern (LEGR) was used to simulate leading edge contamination. After baseline cases were completed, the LEGR was applied for both steady state and model pitch oscillation cases. The Reynolds numbers used for steady state conditions were 0.75, 1, 1.25, and 1.5 million, while the angle of attack ranged from -20{degrees} to +40{degrees}. With the model undergoing pitch oscillations, data were acquired at Reynolds numbers of 0.75, 1, 1.25, and 1.4 million, at frequencies of 0.6, 1.2, and 1.8 Hz. Two sine wave forcing functions were used, {plus_minus} 5.5 {degrees}and {plus_minus} 10{degrees}, at mean angles of attack of 8{degrees} 14{degrees} and 20{degrees} For purposes herein, any reference to unsteady conditions means that the airfoil model was in pitch oscillation about the quarter chord.

Ramsay, R.R.; Hoffman, M.J.; Gregorek, G.M. [Ohio State Univ., Columbus, OH (United States)

1996-01-01T23:59:59.000Z

411

Enhanced electron transport in dye-sensitized solar cells using short ZnO nanotips on a rough metal anode.  

DOE Green Energy (OSTI)

Many efforts have been directed toward the enhancement of electron transport in dye-sensitized solar cells (DSSC) using one-dimensional nanoarchitectured semiconductors. However, the improvement resulting from these ordered 1-D nanostructured electrodes is often offset or diminished by the deterioration in other device parameters intrinsically associated with the use of these 1-D nanostructures, such as the two-sided effect of the length of the nanowires impacting the series resistance and roughness factor. In this work, we mitigate this problem by allocating part of the roughness factor to the collecting anode instead of imparting all the roughness factors onto the semiconductor layer attached to the anode. A microscopically rough Zn microtip array is used as an electron-collecting anode on which ZnO nanotips are grown to serve as the semiconductor component of the DSSC. For the same surface roughness factor, our Zn-microtip|ZnO-nanotip DSSC exhibits an enhanced fill factor compared with DSSCs that have ZnO nanowires supported by a planar anode. In addition, the open-circuit voltage of the Zn-microtip|ZnO-nanotip DSSC is also improved due to a favorable band shift at the Zn-ZnO interface, which raises the Fermi level of the semiconductor and consequently enlarges the energy gap between the quasi-Fermi level of ZnO and the redox species. With these improvements, the overall efficiency becomes 1.4% with an open-circuit voltage of 770 mV, while the surface roughness factor of ZnO is approximately 60. Electrochemical impedance spectroscopic study reveals that the electron collection time is much shorter than the electron lifetime, suggesting that fast electron collection occurs in our device due to the significantly reduced electron collection distance along the short ZnO nanotips. The overall improvement demonstrates a new approach to enhance the efficiency of dye-sensitized solar cells.

Yang, Z.; Xu, T.; Ito, Y.; Welp, U.; Kwok, W. K.; Materials Science Division; Northern Illinois Univ.

2009-10-22T23:59:59.000Z

412

Cálculo de campo electromagnético producido por rayo para terreno no plano y su efecto en las tensiones inducidas en líneas de distribución / Electromagnetic field calculation produced by lightning in non flat terrain and its the effect on the lightning induced voltages on distribution networks.  

E-Print Network (OSTI)

??Soto Ríos, Edison Andrés (2010) Cálculo de campo electromagnético producido por rayo para terreno no plano y su efecto en las tensiones inducidas en líneas… (more)

Soto Ríos, Edison Andrés

2010-01-01T23:59:59.000Z

413

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)

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 generalVariation of Solar Attenuation with Height in CAPLTER Abstract The atmosphere over rural

Hall, Sharon J.

414

Incorporation of Stratification Effects on the Oceanic Roughness Length in the Derivation of the Neutral Drag Coefficient  

Science Conference Proceedings (OSTI)

Based on the assumption that, over the sea, the roughness length of the wind profile scales with the wind stress, a new formulation that describes the drag coefficient as a function of the given neutral drag coefficient and stability is derived. ...

Gerald Geernaert; Kristina B. Katsaros

1986-09-01T23:59:59.000Z

415

Effluent Quality Prediction of Wastewater Treatment Plant Based on Fuzzy-Rough Sets and Artificial Neural Networks  

Science Conference Proceedings (OSTI)

Effluent ammonia-nitrogen (NH3-N), chemical oxygen demand (COD) and total nitrogen (TN) removals are the most common environmental and process performance indicator for all types of wastewater treatment plants (WWTPs). In this paper, a soft computing ... Keywords: neural network, fuzzy rough sets, input variable selection, wastewater treatment, prediction, soft computing

Fei Luo; Ren-hui Yu; Yu-ge Xu; Yan Li

2009-08-01T23:59:59.000Z

416

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

E-Print Network (OSTI)

ocean, the energy flux carried by internal waves generated over rough topog- raphy dominates the energy that the inclusion of this dissipation mechanism improves hydro- dynamical models of the ocean tide. It also issues. The first is whether including a parameterization for internal wave energy-flux in a model

Jayne, Steven

417

Effects of surface roughness and vortex generators on the NACA 4415 airfoil  

DOE Green Energy (OSTI)

Wind turbines in the field can be subjected to many and varying wind conditions, including high winds with rotor locked or with yaw excursions. In some cases the rotor blades may be subjected to unusually large angles of attack that possibly result in unexpected loads and deflections. To better understand loadings at unusual angles of attack, a wind tunnel test was performed. An 18-inch constant chord model of the NACA 4415 airfoil section was tested under two dimensional steady state conditions in the Ohio State University Aeronautical and Astronautical Research Laboratory (OSU/AARL) 7 x 10 Subsonic Wind Tunnel (7 x 10). The objective of these tests was to document section lift and moment characteristics under various model and air flow conditions. These included a normal angle of attack range of {minus}20{degree} to +40{degree}, an extended angle of attack range of {minus}60{degree} to +230{degree}, applications of leading edge grit roughness (LEGR), and use of vortex generators (VGs), all at chord Reynolds numbers as high as possible for the particular model configuration. To realistically satisfy these conditions the 7 x 10 offered a tunnel-height-to-model-chord ratio of 6.7, suggesting low interference effects even at the relatively high lift and drag conditions expected during the test. Significantly, it also provided chord Reynolds numbers up to 2.0 million. 167 figs., 13 tabs.

Reuss, R.L.; Hoffman, M.J.; Gregorek, G.M. [Ohio State Univ., Columbus, OH (United States)

1995-12-01T23:59:59.000Z

418

Comprehensive Evaluation Model of Building Energy Efficiency Based on Rough Sets Theory  

E-Print Network (OSTI)

In order to improve the objectivity of building energy efficiency evaluation, this paper uses a new method to evaluate building energy efficiency on the basis of rough sets theory. The contribution of different subentry evaluation indicators to comprehensive evaluation is calculated with the conception of attribute-significance, and then their weights are decided by using weighted normalization. According to characteristics of subentry evaluation indicators, their scores are conformed, in the end their comprehensive evaluation is calculated depending on sums of weight normalization. The model is validated by the swatches that are given on base of the software "DeST". It is concluded that the comprehensive evaluation on base of the model coincides with the result of the software " DeST ". The contribution of shape coefficient is most important among the different factors, and building orientation is next. The method by which weight can be decided with the conception "attribute- significance from RS cuts down man-made factors” interfere., and objective results can be obtained.

Ding, L.; Ruan, X.; Huang, J.; Li, Y.

2006-01-01T23:59:59.000Z

419

Image Formation by Incoherent and Coherent Transition Radiation from Flat and Rough Surfaces  

SciTech Connect

In this paper we derive equations for the image formation of transverse profile of a relativistic beam obtained by means of optical transition radiation (OTR) from flat and rough metal surfaces. The motivation behind this study lies in the desire to suppress coherent transition radiation (COTR) observed in experiments at modern free electron lasers. The physical mechanism behind the problem of COTR is that the OTR is predominantly radiated at small angles of order of 1/{gamma} where {gamma} is the relativistic factor of the beam. This means that the transverse formation size of the image is of order of {bar {lambda}}{gamma} where {bar {lambda}} = {lambda}/2{pi} with {lambda} the radiation wavelength. For relativistic beams this can be comparable or even exceed the transverse size of the beam, which would mean that the image of the beam has very little to do with its transverse profile. It is fortuitous, however, that the incoherent image is formed by adding radiation energy of electrons and results in the transverse formation size being of order of {bar {lambda}}/{theta}{sub a}, with {theta}{sub a} is the aperture angle of the optical system. The COTR image, in contrast, is formed by adding electromagnetic field of electrons, and leads to the formation size {bar {lambda}}{gamma}. In situations when the COTR intensity exceeds that of OTR the COTR imaging makes the diagnostic incapable of measuring the beam profile.

Stupakov, Gennady; /SLAC

2012-03-01T23:59:59.000Z

420

Evaluation of Advanced Wind Power Forecasting Models Results of the Anemos Project  

E-Print Network (OSTI)

capacity of 33.09 MW distributed on 49 Gamesa G47-660 wind turbines and one Lagerwey LW750 turbine. The RIX (digital terrain maps with elevation and roughness, wind farm layout, wind turbine power and thrust curves of the Baltic Sea. The wind farm consists of 2 Nordtank NTK500/41 turbines with a total rated capacity of 1.0 MW

Paris-Sud XI, Université de

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421

Effects of grit roughness and pitch oscillations on the NACA 4415 airfoil  

DOE Green Energy (OSTI)

A NACA 4415 airfoil model was tested in The Ohio State University Aeronautical and Astronautical Research Laboratory 3 x 5 subsonic wind tunnel under steady state and unsteady conditions. The test defined baseline conditions for steady state angles of attack from {minus}10{degree} to +40{degree} and examined unsteady behavior by oscillating the model about its pitch axis for three mean angles, three frequencies, and two amplitudes. For all cases, Reynolds numbers of 0.75, 1, 1.25, and 1.5 million were used. In addition, these were repeated after the application of leading edge grit roughness (LEGR) to determine contamination effects on the airfoil performance. Steady state results of the NACA 4415 testing at Reynolds number of 1.25 million showed a baseline maximum lift coefficient of 1.30 at 12.3{degree} angle of attack. The application of LEGR reduced the maximum lift coefficient by 20% and increased the 0.0090 minimum drag coefficient value by 62%. The zero lift pitching moment of {minus}0.0967 showed a 13% reduction in magnitude to {minus}0.0842 with LEGR applied. Data were also obtained for two pitch oscillation amplitudes: {+-}5.5{degree} and {+-}10{degree}. The larger amplitude consistently gave a higher maximum lift coefficient than the smaller amplitude, and both unsteady maximum lift coefficients were greater than the steady state values. Stall is delayed on the airfoil while the angle of attack is increasing, thereby causing an increase in maximum lift coefficient. A hysteresis behavior was exhibited for all the unsteady test cases. The hysteresis loops were larger for the higher reduced frequencies and for the larger amplitude oscillations. As in the steady case, the effect of LEGR in the unsteady case was to reduce the lift coefficient at high angles of attack. In addition, with LEGR, the hysteresis behavior persisted into lower angles of attack than for the clean case.

Hoffmann, M.J.; Reuss Ramsay, R.; Gregorek, G.M. [Ohio State Univ., Columbus, OH (United States)

1996-07-01T23:59:59.000Z

422

Effects of grit roughness and pitch oscillations on the S809 airfoil  

DOE Green Energy (OSTI)

An S809 airfoil model was tested in The Ohio State University Aeronautical and Astronautical Research Laboratory (OSU/AARL) 3{times}5 subsonic wind tunnel (3{times}5) under steady flow and stationary model conditions, and also with the model undergoing pitch oscillations. To study the possible extent of performance loss due to surface roughness, a standard grit pattern (LEGR) was developed to simulate leading edge contamination. After baseline cases were completed, the LEGR was applied for both steady state and model pitch oscillation cases. The Reynolds numbers for steady state conditions were 0.75, 1, 1.25, and 1.5 million, while the angle of attack ranged from {minus}20, to +40 {degrees}. With the model undergoing pitch oscillations, data were acquired at Reynolds numbers of 0.75, 1, 1.25, and 1.4 million, at frequencies of 0.6, 1.2, and 1.8 Hz. Two sine wave forcing functions were used; {plus_minus} 5.5{degrees} and {plus_minus} 10{degrees}, at mean angles of attack of 8{degrees}, 14{degrees}, and 20{degrees}. For purposes herein, any reference to unsteady conditions means the model was in pitch oscillation about the quarter chord. In general, the unsteady maximum lift coefficient was from 4% to 86% higher than the steady state maximum lift coefficient, and variation in the quarter chord pitching moment coefficient magnitude was from {minus}83% to 195% relative to steady state values at high angles of attack. These findings indicate the importance of considering the unsteady flow behavior occurring in wind turbine operation to obtain accurate load estimates.

Ramsay, R.F.; Hoffman, M.J.; Gregorek, G.M. [Ohio State Univ., Columbus, OH (United States)

1995-12-01T23:59:59.000Z

423

Effects of grit roughness and pitch oscillations on the S810 airfoil  

DOE Green Energy (OSTI)

An S810 airfoil model was tested in The Ohio State University Aeronautical and Astronautical Research Laboratory 3 x 5 subsonic wind tunnel under steady state and unsteady conditions. The test defined baseline conditions for steady state angles of attack from -20{degrees} to +40{degrees} and examined unsteady behavior by oscillating the model about its pitch axis for three mean angles, three frequencies, and two amplitudes. For all cases, Reynolds numbers of 0.75, 1, 1.25, and 1.5 million were used. In addition, the above conditions were repeated after the application of leading edge grit roughness (LEGR) to determine contamination effects on the airfoil performance. Baseline steady state results of the S810 testing showed a maximum lift coefficient of 1.15 at 15.2{degrees}angle of attack. The application of LEGR reduced the maximum lift coefficient by 12% and increased the 0.0085 minimum drag coefficient value by 88%. The zero lift pitching moment of -0.0286 showed a 16% reduction in magnitude to -0.0241 with LEGR applied. Data were also obtained for two pitch oscillation amplitudes: {plus_minus}5.5{degrees} and {plus_minus}10{degrees}. The larger amplitude consistently gave a higher maximum lift coefficient than the smaller amplitude and both sets of unsteady maximum lift coefficients were greater than the steady state values. Stall was delayed on the airfoil while the angle of attack was increasing, thereby causing an increase in maximum lift coefficient. A hysteresis behavior was exhibited for all the unsteady test cases. The hysteresis loops were larger for the higher reduced frequencies and for the larger amplitude oscillations. In addition to the hysteresis behavior, an unusual feature of these data were a sudden increase in the lift coefficient where the onset of stall was expected. As in the steady case, the effect of LEGR in the unsteady case was to reduce the lift coefficient at high angles of attack.

Ramsay, R.R.; Hoffman, M.J.; Gregorek, G.M. [Ohio State Univ., Columbus, OH (United States)

1996-01-01T23:59:59.000Z

424

Surface Termination and Roughness of Ge(100) Cleaned by HF and HCl Solutions  

DOE Green Energy (OSTI)

Oxide removal from Ge(100) surfaces treated by HCl and HF solutions with different concentrations are systematically studied by synchrotron radiation photoelectron spectroscopy (SR-PES). SR-PES results show that clean surfaces without any oxide can be obtained after wet chemical cleaning followed by vacuum annealing with a residual carbon contamination of less than 0.02 monolayer. HF etching leads to a hydrogen terminated Ge surface whose hydrogen coverage is a function of the HF concentration. In contrast, HCl etching yields a chlorine terminated surface. Possible etching mechanisms are discussed. Surface roughness after HF and HCl treatments is also investigated by AFM, which shows that HF treatment leaves a rougher surface than HCl. Germanium (Ge) is increasingly being studied for MOSFET applications to take advantage of its high intrinsic electron and hole mobility. To fabricate high performance devices on Ge, it is essential to understand Ge surface chemistry and find an effective way to clean and passivate its surface. Although Si surface cleaning and passivation have been extensively studied, only recently has some research been done on Ge surfaces. Conventional XPS results show that HF etching removes Ge oxide and carbon contamination significantly, and HCl etching leads to a chlorine terminated Ge(111) surface, which only forms Ge monochloride. However, it is difficult to probe the details of the chemical nature of treated surfaces and quantify the surface termination and cleanness with conventional XPS, because of its limited surface sensitivity and resolution. In addition, little attention has been paid to the HF concentration, which turns out to be an important factor in the surface hydrogen passivation. In this work, we study the Ge(100) surfaces treated by aqueous HCl and HF solutions with three different concentrations by synchrotron radiation photoelectron spectroscopy (SR-PES) at Stanford Synchrotron Radiation Laboratory (SSRL). Using SR-PES, we can tune the photon energy to achieve very high surface sensitivity and good resolution, so the chemical states of treated surfaces can be resolved unambiguously, and the surface termination and cleanness can be quantified. We find that HF treatment results in a hydrogen terminated surface, and the hydrogen coverage depends on the HF concentration. In contrast, a Cl terminated Ge(100) surface is achieved after HCl treatment. Both monochloride and dichloride are formed on the surface. The termination difference between HF etching and HCl etching can be explained by the etching mechanism. In both cases, the residual carbon and oxygen after chemical etching can be removed by vacuum annealing.

Sun, Shiyu; /SLAC, SSRL

2005-10-10T23:59:59.000Z

425

Measurements of Aerodynamic Roughness, Bowen Ratio, and Atmospheric Surface Layer Height by Eddy Covariance and Tethersonde Systems Simultaneously over a Heterogeneous Rice Paddy  

Science Conference Proceedings (OSTI)

The aerodynamic roughness, Bowen ratio, and friction velocity were measured over a rice paddy using tethersonde and eddy covariance (EC) systems. In addition, the height ranges of the atmospheric inertial sublayer (ISL) were derived using the ...

Jeng-Lin Tsai; Ben-Jei Tsuang; Po-Sheng Lu; Ken-Hui Chang; Ming-Hwi Yao; Yuan Shen

2010-04-01T23:59:59.000Z

426

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)

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 ...

O'Hanley, Harrison Fagan

2012-01-01T23:59:59.000Z

427

The Effect of Inaccuracies in Weather-Ship Data on Bulk-Derived Estimates of Flux, Stability and Sea-Surface Roughness  

Science Conference Proceedings (OSTI)

An analytical error analysis (or sensitivity study) is performed for the momentum, heat, and humidity flux estimates made from weather-ship observations by using the bulk flux method. Bulk-derived stability and roughness errors are also examined. ...

Theodore V. Blanc

1986-03-01T23:59:59.000Z

428

An Evaluation of Two Models for Estimation of the Roughness Height for Heat Transfer between the Land Surface and the Atmosphere  

Science Conference Proceedings (OSTI)

Roughness height for heat transfer is a crucial parameter in estimation of heat transfer between the land surface and the atmosphere. Although many empirical formulations have been proposed over the past few decades, the uncertainties associated ...

Z. Su; T. Schmugge; W. P. Kustas; W. J. Massman

2001-11-01T23:59:59.000Z

429

A Global Climatology of Albedo, Roughness Length and Stomatal Resistance for Atmospheric General Circulation Models as Represented by the Simple Biosphere Model (SiB)  

Science Conference Proceedings (OSTI)

Components of the Simple Biosphere Model (SiB) of Sellers et al. were used to generate global monthly fields of surface albedo (0.4–4.0 ?m), roughness length and minimum surface (stomatal) resistance.

J. L. Dorman; P. J. Sellers

1989-09-01T23:59:59.000Z

430

Reduction of Crosshatch Roughness and Threading Dislocation Density in Metamorphic GaInP Buffers and GaInAs Solar Cells  

Science Conference Proceedings (OSTI)

Surface crosshatch roughness typically develops during the growth of lattice-mismatched compositionally graded buffers and can limit misfit dislocation glide. In this study, the crosshatch roughness during growth of a compressive GaInP/GaAs graded buffer is reduced by increasing the phosphine partial pressure throughout the metamorphic growth. Changes in the average misfit dislocation length are qualitatively determined by characterizing the threading defect density and residual strain. The decrease of crosshatch roughness leads to an increase in the average misfit dislocation glide length, indicating that the surface roughness is limiting dislocation glide. Growth rate is also analyzed as a method to reduce surface crosshatch roughness and increase glide length, but has a more complicated relationship with glide kinetics. Using knowledge gained from these experiments, high quality inverted GaInAs 1 eV solar cells are grown on a GaInP compositionally graded buffer with reduced roughness and threading dislocation density. The open circuit voltage is only 0.38 V lower than the bandgap potential at a short circuit current density of 15 mA/cm{sup 2}, suggesting that there is very little loss due to the lattice mismatch.

France, R. M.; Geisz, J. F.; Steiner, M. A.; To, B.; Romero, M. J.; Olavarria, W. J.; King, R. R.

2012-05-15T23:59:59.000Z

431

www.mdpi.org/ijms The Effects of Heat Treatment on the Physical Properties and Surface Roughness of Turkish Hazel (Corylus colurna L.) Wood  

E-Print Network (OSTI)

Abstract: Heat treatment is often used to improve the dimensional stability of wood. In this study, the effects of heat treatment on the physical properties and surface roughness of Turkish Hazel (Corylus colurna L.) wood were examined. Samples obtained from Kastamonu Forest Enterprises, Turkey, were subjected to heat treatment at varying temperatures and for different durations. The physical properties of heat-treated and control samples were tested, and oven-dry density, air-dry density, and swelling properties were determined. A stylus method was employed to evaluate the surface characteristics of the samples. Roughness measurements, using the stylus method, were made in the direction perpendicular to the fiber. Four main roughness parameters, mean arithmetic deviation of profile (Ra), mean peak-to-valley height (Rz), root mean square roughness (Rq), and maximum roughness (Ry) obtained from the surface of wood were used to evaluate the effect of heat treatment on the surface characteristics of the specimens. Significant difference was determined (p = 0.05) between physical properties and surface roughness parameters (Ra,Rz, Ry, Rq) for three temperatures and threeInt. J. Mol. Sci. 2008, 9 1773 durations of heat treatment. The results showed that the values of density, swelling and

Derya Sevim Korkut; Süleyman Korkut; Ilter Bekar; Mehmet Budakç?; Tuncer Dilik; Nevzat Çak?c?er

2008-01-01T23:59:59.000Z

432

Field Study of Exhaust Fans for Mitigating Indoor Air Quality Problems: Final Report to Bonneville Power Administration  

E-Print Network (OSTI)

terrain class (1-5)[dflt=3J";TCL 'Input terrain class atsite. IF TCL=0 THEN TCL=3 INPUT "Are you going to use wind data froM the

Grimsrud, David T.

2009-01-01T23:59:59.000Z

433

A Two-Stage Quality Control Method for 2-m Temperature Observations Using Biweight Means and a Progressive EOF Analysis  

Science Conference Proceedings (OSTI)

The relatively smooth terrain embedded in the numerical model creates an elevation difference against the actual terrain, which in turn makes the quality control of 2-m temperature difficult when forecast or analysis fields are utilized in the ...

Zhifang Xu; Yi Wang; Guangzhou Fan

2013-02-01T23:59:59.000Z

434

Topography and Radiation Exchange of a Mountainous Watershed  

Science Conference Proceedings (OSTI)

This report deals with the radiation exchange of a complex terrain. A relatively simple network for computing topographic parameters global radiation, and net radiation of a mountainous terrain was developed and applied to a forested Appalachian ...

Hailiang Fu; Stanislaw J. Tajchman; James N. Kochenderfer

1995-04-01T23:59:59.000Z

435

Stratospheric Analysis and Forecast Errors Using Hybrid and Sigma Coordinates  

Science Conference Proceedings (OSTI)

Past investigations have documented large divergent wind anomalies in stratospheric reanalyses over steep terrain, which were attributed to discretization errors produced by the terrain-following (sigma) vertical coordinate in the forecast model. ...

Stephen D. Eckermann; John P. McCormack; Jun Ma; Timothy F. Hogan; Katherine A. Zawdie

436

Tandem mobile robot system  

DOE Patents (OSTI)

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.

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

2003-01-01T23:59:59.000Z

437

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

E-Print Network (OSTI)

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. ...

Noone, Corey J. (Corey James)

2011-01-01T23:59:59.000Z

438

Doppler Radar Analysis of a Snake River Plain Convergence Event  

Science Conference Proceedings (OSTI)

A convergence zone periodically forms in the Snake River plain (SRP) of eastern Idaho as a result of terrain-induced boundary layer flow under synoptic northwesterly flow at low and midlevels. Complex terrain in central and eastern Idaho is ...

Thomas A. Andretta; Dean S. Hazen

1998-06-01T23:59:59.000Z

439

Using SAR Remote Sensing, Field Observations, and Models to Better Understand Coastal Flows in the Gulf of Alaska  

Science Conference Proceedings (OSTI)

The steeply rising coastal terrain of southeast Alaska can produce a wide variety of terrain-induced flows such as barrier jets, gap flows, and downslope wind storms. This study uses a combination of satellite remote sensing, field observations, ...

Nathaniel S. Winstead; Brian Colle; Nicholas Bond; George Young; Joseph Olson; Kenneth Loescher; Frank Monaldo; Donald Thompson; William Pichel

2006-06-01T23:59:59.000Z

440

A Multiscale and Multidisciplinary Investigation Of Ecosystem–Atmosphere CO2 Exchange Over the Rocky Mountains of Colorado  

Science Conference Proceedings (OSTI)

A significant fraction of Earth consists of mountainous terrain. However, the question of how to monitor the surface–atmosphere carbon exchange over complex terrain has not been fully explored. This article reports on studies by a team of ...

Jielun Sun; Steven P. Oncley; Sean P. Burns; Britton B. Stephens; Donald H. Lenschow; Teresa Campos; Andrew S. Watt; Russell K. Monson; David J. P. Moore; Jia Hu; Mark Tschudi; David S. Schimel; Steven Aulenbach; William J. Sacks; Stephan F. J. De Wekker; Chun-Ta Lai; Brian Lamb; Eugene Allwine; Teresa Coons; Dennis Ojima; Patrick Z. Ellsworth; Leonel S. L. Sternberg; Sharon Zhong; Craig Clements; Dean E. Anderson

2010-02-01T23:59:59.000Z

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


441

A High-Resolution Topographic Correction Method for Clear-Sky Solar Irradiance Derived with a Numerical Weather Prediction Model  

Science Conference Proceedings (OSTI)

Rugged terrain is a source of variability in the incoming solar radiation field, but the influence of terrain is still not properly included by most current numerical weather prediction (NWP) models. In this work, a downscaling postprocessing ...

José A. Ruiz-Arias; David Pozo-Vázquez; Vicente Lara-Fanego; Francisco J. Santos-Alamillos; J. Tovar-Pescador

2011-12-01T23:59:59.000Z

442

Robust Low-Frequency Spread-Spectrum Navigation System  

... reliable tracking and navigation in buildings, heavy foliage, urban terrain, caves, and underground with less interference than is currently available ...

443

Building and Fire Publications  

Science Conference Proceedings (OSTI)

... Smoke Plume Trajectory From In Situ Burning of Crude Oil in Alaska: Field Experiments and Modeling of Complex Terrain. ...

444

PHOTOGRAMMETRIC ENGINEERING & REMOTE SENSING 1 ADVISER: Immersive Scientific Visualization Applied  

E-Print Network (OSTI)

be applied to the terrain (Figure 2b). A custom pixel shader was integrated with ROAM to render the dynamic

Head III, James William

445

The Fantasy and Fear of Chernobyl's Ruins  

E-Print Network (OSTI)

Polissian terrain. 42 Decommissioning and clean-up workersleft to complete the decommissioning of a dangerous and

Rotfeld, Masha

2012-01-01T23:59:59.000Z

446

NDVI-based vegetation rendering  

Science Conference Proceedings (OSTI)

The area of terrain rendering has seen great improvements both in rendering performance and image quality. The latest terrain rendering algorithms efficiently utilize the capabilities of actual programmable graphics hardware in order to achieve real-time ... Keywords: continuous level of detail, terrain rendering, texture splatting, vegetation rendering

Stefan Roettger

2007-01-01T23:59:59.000Z

447

Machine Vision and Applications (2010) 21:713725 DOI 10.1007/s00138-009-0188-9  

E-Print Network (OSTI)

does not scale well to distant terrain. This paper examines the use of wide-baseline ste- reo vision of this technique to terrain mapping for Mars exploration. In wide-baseline stereo, the images are not captured more accurate depth estimation of distant terrain, but the robot motion between camera positions

Olson, Clark F.

448

Mars Background Information General Information  

E-Print Network (OSTI)

the astronauts from radiation exposure. Terrain Mars has widely varied terrain. Primary challenges include dust to the planet will be successful. These challenges include: dust, radiation, atmosphere, and terrain. Dust Dust for explorers on Mars. First, oxygen will have to be brought whether fuel cells or internal combustion engines

Dennis, Robert G.

449

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

DOE Patents (OSTI)

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.

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

1999-05-25T23:59:59.000Z

450

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

SciTech Connect

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.

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

1983-09-01T23:59:59.000Z

451

Roughness and surface material effects on nucleate boiling heat transfer from cylindrical surfaces to refrigerants R-134a and R-123  

SciTech Connect

This paper presents results of an experimental investigation carried out to determine the effects of the surface roughness of different materials on nucleate boiling heat transfer of refrigerants R-134a and R-123. Experiments have been performed over cylindrical surfaces of copper, brass and stainless steel. Surfaces have been treated by different methods in order to obtain an average roughness, Ra, varying from 0.03 {mu}m to 10.5 {mu}m. Boiling curves at different reduced pressures have been raised as part of the investigation. The obtained results have shown significant effects of the surface material, with brass being the best performing and stainless steel the worst. Polished surfaces seem to present slightly better performance than the sand paper roughened. Boiling on very rough surfaces presents a peculiar behavior characterized by good thermal performance at low heat fluxes, the performance deteriorating at high heat fluxes with respect to smoother surfaces. (author)

Jabardo, Jose M. Saiz [Escuela Politecnica Superior, Universidad de la Coruna, Mendizabal s/n Esteiro, 15403 Ferrol, Coruna (Spain); Ribatski, Gherhardt; Stelute, Elvio [Department of Mechanical Engineering, Escola de Engenharia de Sao Carlos (EESC), University of Sao Paulo (USP), Av. Trabalhador Saocarlense 400 Centro, 13566-590 Sao Carlos, SP (Brazil)

2009-04-15T23:59:59.000Z

452

Two-phase flow visualization and relative permeability measurement in transparent replicas of rough-walled rock fractures  

DOE Green Energy (OSTI)

Understanding and quantifying multi-phase flow in fractures is important for mathematical and numerical simulation of geothermal reservoirs, nuclear waste repositories, and petroleum reservoirs. While the cubic law for single-phase flow has been well established for parallel-plate fractures theoretically and experimentally, no reliable measurements of multi-phase flow in fractures have been reported. This work reports the design and fabrication of an apparatus for visualization of two-phase flow and for measurement of gas-liquid relative permeability in realistic rough-walled rock fractures. A transparent replica of a natural rock fracture from a core specimen is fabricated by molding and casting in clear epoxy. Simultaneous flow of gas and liquid with control of capillary pressure at inlet and outlet is achieved with the Hassler sandwich'' design: liquid is injected to the fracture through a porous block, while gas is injected directly to the edge of the fracture through channels in the porous block. A similar arrangement maintains capillary separation of the two phases at the outlet. Pressure drops in each phase across the fracture, and capillary pressures at the inlet and outlet, are controlled by means of pumps and needle valves, and are measured by differential and absolute pressure transducers. The clear epoxy cast of the natural fracture preserves the geometry of the fracture and permits visual observation of phase distributions. The fracture aperture distribution can be estimated by filling the fracture with a dyed liquid, and making pointwise measurements of the intensity of transmitted light.

Persoff, P.; Pruess, K.; Myer, L.

1991-01-01T23:59:59.000Z

453

Review of the margins for ASME code fatigue design curve - effects of surface roughness and material variability.  

Science Conference Proceedings (OSTI)

The ASME Boiler and Pressure Vessel Code provides rules for the construction of nuclear power plant components. The Code specifies fatigue design curves for structural materials. However, the effects of light water reactor (LWR) coolant environments are not explicitly addressed by the Code design curves. Existing fatigue strain-vs.-life ({var_epsilon}-N) data illustrate potentially significant effects of LWR coolant environments on the fatigue resistance of pressure vessel and piping steels. This report provides an overview of the existing fatigue {var_epsilon}-N data for carbon and low-alloy steels and wrought and cast austenitic SSs to define the effects of key material, loading, and environmental parameters on the fatigue lives of the steels. Experimental data are presented on the effects of surface roughness on the fatigue life of these steels in air and LWR environments. Statistical models are presented for estimating the fatigue {var_epsilon}-N curves as a function of the material, loading, and environmental parameters. Two methods for incorporating environmental effects into the ASME Code fatigue evaluations are discussed. Data available in the literature have been reviewed to evaluate the conservatism in the existing ASME Code fatigue evaluations. A critical review of the margins for ASME Code fatigue design curves is presented.

Chopra, O. K.; Shack, W. J.; Energy Technology

2003-10-03T23:59:59.000Z

454

Effects of image charges, interfacial charge discreteness, and surface roughness on the zeta potential of spherical electric double layers  

E-Print Network (OSTI)

We investigate the effects of image charges, interfacial charge discreteness, and surface roughness on spherical electric double layers in electrolyte solutions with divalent counter-ions in the setting of the primitive model. By using Monte Carlo simulations and the image charge method, the zeta potential profile and the integrated charge distribution function are computed for varying surface charge strengths and salt concentrations. Systematic comparisons were carried out between three distinct models for interfacial charges: 1) SURF1 with uniform surface charges, 2) SURF2 with discrete point charges on the interface, and 3) SURF3 with discrete interfacial charges and finite excluded volume. By comparing the integrated charge distribution function (ICDF) and potential profile, we argue that the potential at the distance of one ion diameter from the macroion surface is a suitable location to define the zeta potential. In SURF2 model, we find that image charge effects strongly enhance charge inversion for monovalent interfacial charges, and strongly suppress charge inversion for multivalent interfacial charges. For SURF3, the image charge effect becomes much smaller. Finally, with image charges in action, we find that excluded volumes (in SURF3) suppress charge inversion for monovalent interfacial charges and enhance charge inversion for multivalent interfacial charges. Overall, our results demonstrate that all these aspects, i.e., image charges, interfacial charge discreteness, their excluding volumes have significant impacts on the zeta potential, and thus the structure of electric double layers.

Zecheng Gan; Xiangjun Xing; Zhenli Xu

2012-02-11T23:59:59.000Z

455

Interface roughness induced asymmetric magnetic property in sputter-deposited Co/CoO/Co exchange coupled trilayers  

SciTech Connect

The effect of interface roughness on magnetic properties of exchange coupled polycrystalline Co/CoO(t{sub AF})/Co trilayers has been investigated by varying antiferromagnetic layer (CoO) thickness. It has been found that the upper CoO/Co interface becomes rougher with increasing CoO layer thickness, resulting in stronger exchange bias of the upper interface than the lower one. The interfacial exchange coupling is strengthened by the increase of defect-generated uncompensated antiferromagnetic spins; such spins form coupling with spins in the Co layer at the interface. As a result, the CoO layer thickness dependence of exchange bias is much enhanced for the upper Co layer. The transition from anisotropic magnetoresistance to isotropic magnetoresistance for the top Co layer has also been found. This could be attributed to the defects, probably partial thin oxide layers, between Co grains in the top Co layer that leads a switch from spin-orbit scattering related magnetoresistance to spin-dependent electron scattering dominated magnetoresistance.

Wang, J.; Sannomiya, T.; Shi, J.; Nakamura, Y. [Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology, 2-12-1, O-okayama, Meguro-ku, Tokyo, 152-8552 (Japan)

2012-04-01T23:59:59.000Z

456

MCELROY REPORT; ROUGH DRAFT  

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

Combining a New 3-D Seismic S-Wave Propagation Analysis Combining a New 3-D Seismic S-Wave Propagation Analysis for Remote Fracture Detection with a Robust Subsurface Microfracture-Based Verification Technique FINAL REPORT June 6, 2000-December 31, 2003 Principal Authors: Bob Hardage, M. M. Backus, M. V. DeAngelo, R. J. Graebner, S. E. Laubach, and Paul Murray Report Issue Date: February 2004 DOE Contract No. DE-AC26-00NT40690 Submitting Organization: Bureau of Economic Geology The University of Texas at Austin University Station, Box X Austin, TX 78713-8924 Disclaimer This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal

457

Effect of substrate roughness on the apparent surface free energy of sputter deposited superhydrophobic polytetrafluoroethylene coatings: A comparison of experimental data with different theoretical models  

Science Conference Proceedings (OSTI)

We have studied the effect of substrate roughness on the wettability and the apparent surface free energy (SFE) of sputter deposited polytetrafluoroethylene (PTFE) coatings deposited on untreated glass (average roughness, R{sub a}=2.0 nm), plasma etched glass (R{sub a}=7.4 nm), and sandblasted glass (R{sub a}=4500 nm) substrates. The wettability of the PTFE coatings deposited on substrates with varying roughnesses was evaluated by measuring the apparent contact angle (CA) using a series of probe liquids from nonpolar aprotic to polar protic. The wettability measurements indicate that an apparent water CA of 152 deg. with a sliding angle of 8 deg. was achieved for PTFE coatings deposited on a substrate with R{sub a}=4500 nm. The superhydrophobicity observed in these coatings is attributed to the presence of dual scale roughness, densely packed microstructure and the presence of CF{sub 3} groups. Unlike the bulk PTFE which is mainly dispersive, the sputter deposited PTFE coatings are expected to have some degree of polar component due to the plasma treatment. In order to calculate the dispersive SFE of PTFE coatings, we have used the Girifalco-Good-Fowkes (GGF) method and validated it with the Zisman model. Furthermore, the Owens-Wendt model has been used to calculate the dispersive and the polar components of the apparent SFE of the PTFE coatings. These results are further corroborated using the Fowkes method. Finally, an ''equation of state'' theory proposed by Neumann has been used to calculate the apparent SFE values of the PTFE coatings. The results indicate that the apparent SFE values of the PTFE coatings obtained from the Owens-Wendt and the Fowkes methods are comparable to those obtained from the Neumann's method. The analyses further demonstrate that the GGF and the Zisman methods underestimate the apparent SFE values of the sputter deposited PTFE coatings.

Selvakumar, N.; Barshilia, Harish C.; Rajam, K. S. [Surface Engineering Division, National Aerospace Laboratories, CSIR, Bangalore 560 017 (India)

2010-07-15T23:59:59.000Z

458

Linear surface smoothening of (Ti{sub 0.48}Al{sub 0.52})N thin films grown on rough substrates  

SciTech Connect

The evolution of surface roughness during the growth of sputter-deposited solid solution (Ti{sub 0.48}Al{sub 0.52})N films on rough high-speed-steel (HSS) substrates has been studied by atomic force microscopy. It has been revealed that the growing (Ti{sub 0.48}Al{sub 0.52})N/HSS film experiences a continuous surface smoothening. Scaling analyses along with surface power spectra calculation of the (Ti{sub 0.48}Al{sub 0.52})N films grown on smooth Si(100) substrates under the same deposition conditions indicate that this surface smoothening is linear and can be explained by a simple linear equation with surface diffusion as the smoothening mechanism and shot noise as the roughening effect. The observed linear surface smoothening in (Ti{sub 0.48}Al{sub 0.52})N/HSS films has also been confirmed by our numerical simulations of the film growth using real HSS and Si(100) substrates as their initial growth conditions and can be understood in terms of the competition between the surface-diffusion-induced decrease in substrate roughness contribution and the noise-driven roughening effect.

Liu, Z.-J.; Shum, P.W.; Shen, Y.G. [Department of Manufacturing Engineering and Engineering Management (MEEM), City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong (China)

2005-06-20T23:59:59.000Z

459

DOE-STD-1090-2004; Hoisting and Rigging (Formerly Hoisting and Rigging Manual)  

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

0 0 FORKLIFT TRUCKS 10-i Chapter 10 Forklift Trucks This chapter specifies operation, inspection, testing, and maintenance requirements for forklift trucks powered by internal-combustion engines or electric motors and implements the requirements of ASME B56.1 ("Safety Standard for powered Industrial Trucks - Low Lift and High lift Trucks") and B56.6 ("Rough Terrain Fork Lift Trucks"), and ANSI/UL 558 ("Internal-Combustion-Engine-Powered Industrial Trucks") and 583 ("Electric-Battery-Powered Industrial Trucks"). 10.1 GENERAL ...............................................................................................................................10-1 10.1.1 Operator Training/Qualification ................................................................................10-1

460

DOE-STD-1090-2007; Hoisting and Rigging Standard (Formerly Hoisting and Rigging Manual)  

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

0 0 FORKLIFT TRUCKS 10-i This chapter specifies operation, inspection, testing, and maintenance requirements for forklift trucks powered by internal-combustion engines or electric motors and implements the requirements of ANSI/ITSDF B56.1 ("Safety Standard for powered Industrial Trucks - Low Lift and High lift Trucks") and ANSI/ITSDF B56.6 ("Rough Terrain Fork Lift Trucks"), and ANSI/UL 558 ("Internal-Combustion- Engine-Powered Industrial Trucks") and ANSI/UL 583 ("Electric-Battery-Powered Industrial Trucks"). 10.1 GENERAL ...............................................................................................................................10-1 10.1.1 Operator Training/Qualification ................................................................................10-1

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


461

Tech Beat November 25, 2008  

Science Conference Proceedings (OSTI)

... that has uneven terrain and PVC pipes for trees ... method also allows the measurement of heat flow in ... Heating of floor beams and girders caused a ...

2011-04-25T23:59:59.000Z

462

Automatic Recognition of Human Team Behaviors  

E-Print Network (OSTI)

This paper describes a methodology for recording, representing, and recognizing team behaviors performed by human players in an Unreal Tournament MOUT (Military Operations in Urban Terrain) scenario.

Gita Sukthankar; Katia Sycara

2005-01-01T23:59:59.000Z

463

BFRL: Fire on the Web - ALOFT-FT Download  

Science Conference Proceedings (OSTI)

... NISTIR 5958 Smoke Plume Trajectory From In Situ Burning of Crude Oil in Alaska: Field Experiments and Modeling of Complex Terrain. ...

464

ALOFT-FT: Frequently Asked Questions  

Science Conference Proceedings (OSTI)

... NISTIR 5958 Smoke Plume Trajectory From In Situ Burning of Crude Oil in Alaska: Field Experiments and Modeling of Complex Terrain. ...

2012-10-31T23:59:59.000Z

465

Fire on the Web  

Science Conference Proceedings (OSTI)

... Trajectory model - Flat Terrain) is a computer based model to predict the downwind distribution of smoke particulate and combustion products from ...

466

COMMUNICATIONS OF THE ACM January 2002/Vol. 45, No. 1 43 ameBots [1] is a virtual reality  

E-Print Network (OSTI)

is available in Tcl/Tk, Java, C/C++, and more. Tools for visualiz- ing the terrain in which agents interact

Kaminka, Gal A.

467

Numerical Simulations of Grassland Fire Behavior from the ...  

Science Conference Proceedings (OSTI)

... dimensions are applied to wind driven grassland fires over flat terrain. ... USDA Forest Service, Rocky Mountain Research Station Paper, RMRS-RP-4 ...

2010-01-21T23:59:59.000Z

468

ORNL DAAC, Vegetation Data, March 10, 2003  

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

data pertaining to terrain and soils, water resources, forestry, vegetation, agriculture, land use, wildlife, air quality, climate, natural areas, and endangered species at...

469

1 Statement of the problem  

E-Print Network (OSTI)

[3] H.J. Sussman and G. Tang, Shortest paths for the Reeds-Shepp car: a worked ... erogeneous Terrain, Proc. of 11th Workshop on Hybrid Systems: ...

470

Arthur Zwern, President Arthur.Zwern@HOMErgent.com 408-482-1708  

Terrain Handling Thermal Micro-SIP Folding Shell Flexayurt – 1st Appropriate Technology Home ... 1. Remote Workers: oil co, DoD, 4 channels

471

Wind: wind power density maps at 50 m above ground and 400m resolution...  

Open Energy Info (EERE)

potential within Sri Lanka, with supplemental information on political boundaries, transmission lines, roads, and terrain relief.

2011-06-15T21:50:37Z...

472

An Assessment of ASCE 7–10 Standard Methods for ...  

Science Conference Proceedings (OSTI)

... roofs; and the wind tunnel procedure. ... ft 2 (0.37 m 2 ) flat roof; suburban exposure; flat terrain; basic wind speed 115 mph (51.4 ...

2013-07-24T23:59:59.000Z

473

New York, New York: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":"ROADMAP","SATELLITE","HYBRID","TERRAIN","geoservice":"google","maxzoom":false,"width":"600px","height":"350px",...

474

Consolidated Edison Company of New York, Inc. Smart Grid Demonstration...  

Open Energy Info (EERE)

"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":"ROADMAP","SATELLITE","HYBRID","TERRAIN","geoservice":"google","maxzoom":false,"width":"600px","height":"350px",...

475

San Jose, California: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":"ROADMAP","SATELLITE","HYBRID","TERRAIN","geoservice":"google","maxzoom":false,"width":"600px","height":"350px",...

476

Boston, Massachusetts: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":"ROADMAP","SATELLITE","HYBRID","TERRAIN","geoservice":"google","maxzoom":false,"width":"600px","height":"350px",...

477

Is the Use of Advanced Materials in Sports Equipment Unethical?  

Science Conference Proceedings (OSTI)

An energy-storage return aids performance and contributes to the capability to .... in one of my classes), solar-energy-enhanced bicycles, and terrain-following ...

478

NREL GIS Data: Continental United States Photovoltaic Low Resolution...  

Open Energy Info (EERE)

the uncertainty of the modeled estimates increase with distance from reliable measurement sources and with the complexity of the terrain. Units are in kilowatt hours...

479

NREL GIS Data: Continental United States Photovoltaic Low Resolution...  

Open Energy Info (EERE)

the uncertainty of the modeled estimates increase with distance from reliable measurement sources and with the complexity of the terrain. Further information can be...

480

NREL GIS Data: Hawaii Low Resolution Photovoltaic Solar Resource  

Open Energy Info (EERE)

the uncertainty of the modeled estimates increase with distance from reliable measurement sources and with the complexity of the terrain. Units are in watt...

Note: This page contains sample records for the topic "terrain roughness terrain" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
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to obtain the most current and comprehensive results.


481

NREL GIS Data: Continental United States Photovoltaic Low Resolution  

Open Energy Info (EERE)

the uncertainty of the modeled estimates increase with distance from reliable measurement sources and with the complexity of the terrain.
Further information can...

482

NREL GIS Data: Continental United States Photovoltaic Low Resolution  

Open Energy Info (EERE)

the uncertainty of the modeled estimates increase with distance from reliable measurement sources and with the complexity of the terrain. Units are in kilowatt hours...

483

In Situ Burning of Oil Spills  

Science Conference Proceedings (OSTI)

... burns, the Teflon filters were weighed and sealed in Petri dishes, while the ... terrain, solar heating and surface friction creates a tur- bulent wind field ...

2001-02-13T23:59:59.000Z

484

Microsoft Word - Cover Page - Exhibit 13  

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

placed at their proposed locations and elevations. Structure elevations are set using LIDAR data. C. View Setting The existing conditions photograph is imported into the terrain...

485

Pressure-dependent transition from atoms to nanoparticles in magnetron sputtering: Effect on WSi{sub 2} film roughness and stress  

Science Conference Proceedings (OSTI)

We report on the transition between two regimes from several-atom clusters to much larger nanoparticles in Ar magnetron sputter deposition of WSi{sub 2}, and the effect of nanoparticles on the properties of amorphous thin films and multilayers. Sputter deposition of thin films is monitored by in situ x-ray scattering, including x-ray reflectivity and grazing incidence small-angle x-ray scattering. The results show an abrupt transition at an Ar background pressure P{sub c}; the transition is associated with the threshold for energetic particle thermalization, which is known to scale as the product of the Ar pressure and the working distance between the magnetron source and the substrate surface. Below P{sub c} smooth films are produced while above P{sub c} roughness increases abruptly, consistent with a model in which particles aggregate in the deposition flux before reaching the growth surface. The results from WSi{sub 2} films are correlated with in situ measurement of stress in WSi{sub 2}/Si multilayers, which exhibits a corresponding transition from compressive to tensile stress at P{sub c}. The tensile stress is attributed to coalescence of nanoparticles and the elimination of nanovoids.

Zhou Lan; Wang Yiping; Zhou Hua; Li Minghao; Headrick, Randall L.; MacArthur, Kimberly; Shi Bing; Conley, Ray; Macrander, Albert T. [Department of Physics and Materials Science Program, University of Vermont, Burlington, Vermont 05405 (United States); Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States)

2010-08-15T23:59:59.000Z

486

Aleksander hrn Discernibility and Rough  

E-Print Network (OSTI)

for specific events within the shield material. Furthermore the count rate is low and the resulting poor

487

Draft testimony (very rough start …)  

Science Conference Proceedings (OSTI)

... of natural gas, livestock production, and coal mining ... groups have produced reports and recommendations ... Change Science Program report on the ...

2012-10-09T23:59:59.000Z

488

Draft testimony (very rough start …)  

Science Conference Proceedings (OSTI)

... “Obama Includes Broadband, Smart Grids in Stimulus ... and its Grid Wise Architecture Council (GWAC ... areas of the Smart Grid, including transmission ...

2013-11-03T23:59:59.000Z

489

Three-Dimensional Wind Retrieval: Application of MUSCAT to Dual-Doppler Lidar  

Science Conference Proceedings (OSTI)

During the field campaign of the Terrain-induced Rotor Experiment (T-REX) in the spring of 2006, Doppler lidar measurements were taken in the complex terrain of the Californian Owens Valley for six weeks. While fast three-dimensional (3D) wind ...

Susanne Drechsel; Georg J. Mayr; Michel Chong; Martin Weissmann; Andreas Dörnbrack; Ronald Calhoun

2009-03-01T23:59:59.000Z

490

Nonlinear piecewise polynomial approximation: Theory and Algorithms  

E-Print Network (OSTI)

algorithms for compression and quick rendering of Digital Terrain Elevation Data (DTED) maps and implement results, we develop efficient practical algorithms for compression and quick rendering of Digital Terrain approximation 23 2.3. Slim B-spaces 32 2.4. Skinny B-spaces 42 2.5. Fat B-spaces: The link to Besov spaces 46 2

Karaivanov, Borislav

491

Adaptive smoothing of valleys in DEMs using TIN interpolation from ridgeline elevations: An application to morphotectonic aspect analysis  

Science Conference Proceedings (OSTI)

This paper presents a smoothing method that eliminates valleys of various Strahler-order drainage lines from a digital elevation model (DEM), thus enabling the recovery of local and regional trends in a terrain. A novel method for automated extraction ... Keywords: Aspect analysis, Digital drainage analysis, Digital elevation model, Digital terrain modelling, Rose diagram, Smoothing, Tectonic geomorphology

Gyozo Jordan

2007-05-01T23:59:59.000Z

492

Numerical Simulation of Drainage Flow in Brush Creek, Colorado  

Science Conference Proceedings (OSTI)

One of the objectives of the Atmospheric Studies in Complex Terrain (ASCOT) program is to develop numerical models that can be used to aid in the understanding and prediction of flow patterns observed over complex terrain. As part of this program,...

John M. Leone Jr.; Robert L. Lee

1989-06-01T23:59:59.000Z

493

Resolving Difficult Issues Of Wind Power Micrositing In Complex  

E-Print Network (OSTI)

Micrositing of wind turbines in complex terrain is tricky game, and many of the current siting methods and tools, while useful and improving, remain inadequate to the task in extreme terrain. As a consequence, there are numerous wind turbine installations that are buffeted by damaging turbulence or are faced with suboptimal wind energy performance.

Terrain Session Resource; Russell G. Derickson A; Michael Mcdiarmid B; Brad C. Cochran C; Jon A. Peterka D; Russell G. Derickson A; Michael Mcdiarmid B; Brad C. Cochran C; Jon A. Peterka D

2004-01-01T23:59:59.000Z

494

Planetary Rover Developments Supporting Mars Exploration, Sample Return and Future Human-Robotic Colonization  

Science Conference Proceedings (OSTI)

We overview our recent research on planetary mobility. Products of this effort include the Field Integrated Design & Operations rover (FIDO), Sample Return Rover (SRR), reconfigurable rover units that function as an All Terrain Explorer (ATE), and ... Keywords: all terrain mobility, cooperating robots, mobile robots, reconfigurable robots, robot architecture, robotic colonies

Paul S. Schenker; Terry L. Huntsberger; Paolo Pirjanian; Eric T. Baumgartner; Eddie Tunstel

2003-03-01T23:59:59.000Z

495

An improved topographic mapping technique from airborne lidar: application in a forested hillside  

Science Conference Proceedings (OSTI)

We developed a robust method to reconstruct a digital terrain model DTM by classifying raw light detection and ranging lidar points into ground and non-ground points with the help of the Progressive Terrain Fragmentation PTF method. PTF applies iterative ...

Jun-Hak Lee, GregoryS. Biging, JohnD. Radke, JoshuaB. Fisher

2013-10-01T23:59:59.000Z

496

Performance characteristics of open-flow liquid desiccant solar collector/regenerator for solar cooling applications. Part I: two dimensional analysis of heat and mass transfer for open flow over rough inclined surfaces  

DOE Green Energy (OSTI)

This work presents an analytical approach to simulate the combined heat and mass transfer on the interface between wetted collector surface and ambient air. Emphasis was placed on the development of a mathematical model of turbulent natural convection on an inclined rough plate. The effect of surface velocity is also considered. The systems of partial differential equations governing fluid motion, heat and mass transfer along an inclined flat plate were formulated in terms of vorticity transport and stream function equations. One-equation model of turbulence was used to compute the turbulent viscosity. The length scale used in this model was expressed algebraically in terms of the mixing length. A length scale modified function was derived to take into account the bouyancy effects on turbulence. The effect of surface roughness was taken into a account by introducing a characteristic roughness length. A computational technique was developed to solve the resulting elliptic partial differential equations. This technique involved an 'inflow-outflow' scheme to determine the free boundary conditions at the leading and trailing edges of the inclined plate. The validity of this computational technique was tested and confirmed by some testing problems. Among these are (1) laminar natural convection on an inclined isothermal plate (2) turbulent natural convection on a vertical isothermal plate and (3) turbulent natural convection on an inclined constant heat flux flat plate.

Not Available

1983-11-01T23:59:59.000Z

497

Wind: wind speed and wind power density GIS data at 50m above ground and  

Open Energy Info (EERE)

Bangladesh from RisoeDTU Bangladesh from RisoeDTU Dataset Summary Description (Abstract): These data are results from the KAMM/WASP studies for Bangladesh. Version 2 is an updated version of the earlier release and includes an adjustment to Weibull A and k to bring the Atlas values into better agreement with observations. See supplemental information.The KAMM/WAsP methodology uses a set of wind classes to represent wind conditions for the mapped region. A mesoscale simulation for each wind class, using KAMM (Karlsruhe Mesoscale Model), is performed and statistics performed on the model output. The result is i. a wind resource map, a summary of the simulated wind climate, and ii. a wind atlas, a summary of the wind climate standardized to flat, uniform roughness terrain. (Purpose): The product is intended to be used to

498

Wind Atlas Analysis and Application Program (WAsP) | Open Energy  

Open Energy Info (EERE)

Wind Atlas Analysis and Application Program (WAsP) Wind Atlas Analysis and Application Program (WAsP) Jump to: navigation, search Tool Summary Name: Wind Atlas Analysis and Application Program (WAsP) Agency/Company /Organization: Risoe DTU Sector: Energy Focus Area: Renewable Energy, Wind Topics: GHG inventory, Resource assessment Resource Type: Maps, Software/modeling tools User Interface: Desktop Application Website: www.wasp.dk/ Cost: Paid Wind Atlas Analysis and Application Program (WAsP) Screenshot References: WAsP[1] Background "WAsP is a PC program for predicting wind climates, wind resources and power productions from wind turbines and wind farms. The predictions are based on wind data measured at stations in the same region. The program includes a complex terrain flow model, a roughness change model and a model

499

Wind: wind speed and wind power density GIS data at 50m above ground and  

Open Energy Info (EERE)

Kenya from RisoeDTU Kenya from RisoeDTU Dataset Summary Description (Abstract): These data are results from the KAMM/WASP studies for Kenya. The KAMM/WAsP methodology uses a set of wind classes to represent wind conditions for the mapped region. A mesoscale simulation for each wind class, using KAMM (Karlsruhe Mesoscale Model), is performed and statistics performed on the model output. The results are a summary of the simulated wind climate, and ii. a wind atlas, a summary of the wind climate standardized to flat, uniform roughness terrain. (Purpose): The product is intended to be used to estimate the wind resource potential in the country including the the spatial variability. This map covers regions where long term measurements are not available. In a sense this is the point of the

500

The Cooperative Engagement Capability  

E-Print Network (OSTI)

picture as well as the ability to engage targets that may not be seen locally, a new level of capability may be attained. This ability is precisely what the Cooperative Engagement Capability (CEC) provides for a network of combatants. Recent tests demonstrated that from older, short-range systems such as NATO Sea Sparrow through the latest Aegis baselines, CEC can provide greater defensive capabilities and even provide new types of capabilities to a battle force. However, CEC does not obviate the need for advances in sensors, fire control, and interceptors. Rather, CEC allows the INTRODUCTION Operation in the littoral theater is a principal Navy 1990s scenario with complexities never considered in the Cold War era. For theater air defense, the complexities include the natural environment and its effects on sensor range. For example, desensitization by clutter from propagation ducting and rough terrain, as well as blockage by coastal mountains and clif

Apl

1995-01-01T23:59:59.000Z