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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

Speed Map for Autonomous Rovers over Rough Terrain  

E-Print Network [OSTI]

requires a training set to categorize rough terrain andis rough and what is not by driving over the training set.obstacles and rough. Within the crater data set, PTA detects

Loh, Jonathan Edau

2012-01-01T23:59:59.000Z

2

Stereo-Vision-Based Obstacle Avoidance in Rough Outdoor Terrain  

E-Print Network [OSTI]

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

Berns, Karsten

3

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

4

Visual estimation of wheel sinkage for rough-terrain mobile robots  

Science Journals Connector (OSTI)

For mobile robots driving across natural terrains, it is critical that the dynamic effects occurring at the wheel-terrain interface be taken into account. One of the most prevalent of these effects is wheel sinkage. Wheels can sink to depths sufficient to prevent further motion, possibly leading to danger of entrapment. This paper presents an algorithm for visual estimation of sinkage. We call it the visual sinkage estimation (VSE) method. It assumes the presence of a monocular camera and an artificial pattern, attached to the wheel side, to determine the terrain contact angle. This paper also introduces an analytical model for wheel sinkage in deformable terrain based on terramechanics. To validate the VSE module, firstly, several tests are performed on a single-wheel test bed, under different operating conditions. Secondly, the effectiveness of the proposed approach is proved in real contexts, employing an all-terrain rover travelling on a sandy beach.

Giulio Reina; Annalisa Milella; Angelo Gentile

2010-01-01T23:59:59.000Z

5

Rough-terrain mobile robot planning and control with application to planetary exploration  

E-Print Network [OSTI]

Future planetary exploration missions will require mobile robots to perform difficult tasks in highly challenging terrain, with limited human supervision. Current motion planning and control algorithms are not well suited ...

Iagnemma, Karl David

2001-01-01T23:59:59.000Z

6

Wind assessment in complex terrain with the numeric model Aiolos implementation of the influence of roughness changes and stability  

E-Print Network [OSTI]

Wind assessment in complex terrain with the numeric model Aiolos ­ implementation of the influence of roughness changes and stability Ulrich Focken, Detlef Heinemann, Hans-Peter Waldl Department of Energy (EWA) gives good results for the wind potential estimation in flat areas. But besides many

Heinemann, Detlev

7

Terrain identification methods for planetary exploration rovers  

E-Print Network [OSTI]

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

Brooks, Christopher Allen, 1978-

2004-01-01T23:59:59.000Z

8

Spectra over complex terrain  

SciTech Connect (OSTI)

Spectra have been measured over land downwind of a water surface, over hilltops and escarpments, and over rolling farmland. The following hypotheses can be used to explain the differences between these spectra. (1) For wavelengths short compared to the fetch over the new terrain, spectral densities are in equilibrium with the new terrain. (2) For wavelengths long compared to this fetch, spectral densities remain unchanged if the ground is horizontal. If the flow is over a steep hill, the low-frequency structure is modified by distortion of the mean flow, with the longitudinal component losing energy relative to the lateral and vertical components. Because vertical-velocity spectra contain relatively less low-frequency energy than horizontal-velocity spectra, energetic vertical-velocity fluctuations tend to be in equilibrium with local terrain.

Panofsky, H.A.; Larko, D.; Lipschutz, R.; Stone, G.

1981-01-01T23:59:59.000Z

9

Improved Gravimetric Terrain Corrections  

Science Journals Connector (OSTI)

......formulae are based on a flat-earth assumption. Our...2. Topography in the Rocky Mountains of British Columbia...Kananaskis Valley in the Rocky Mountains was used. The...terrain correction. In the Rocky Mountains of British Columbia...large, thg effect of a flat-earth approximation......

Y. C. Li; M. G. Sideris

1994-12-01T23:59:59.000Z

10

Terrainosaurus: realistic terrain synthesis using genetic algorithms  

E-Print Network [OSTI]

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

Saunders, Ryan L.

2007-04-25T23:59:59.000Z

11

Maps and Mapping Lab 6: Terrain Representation  

E-Print Network [OSTI]

Maps and Mapping Lab 6: Terrain Representation OBJECTIVES Representing the earth's relief on a two. In this exercise, we will examine some ways that terrain can be represented on a map and in digital form. You exaggeration using Google Earth. MATERIALS USGS Quadrangle map, Ruler, Pencil, Calculator, Google Earth (4

Clarke, Keith

12

Learning, planning, and control for quadruped locomotion over challenging terrain  

Science Journals Connector (OSTI)

We present a control architecture for fast quadruped locomotion over rough terrain. We approach the problem by decomposing it into many sub-systems, in which we apply state-of-the-art learning, planning, optimization, and control techniques to achieve ... Keywords: Quadruped locomotion, ZMP optimization, floating base inverse dynamics, locomotion planning and control, template learning

Mrinal Kalakrishnan; Jonas Buchli; Peter Pastor; Michael Mistry; Stefan Schaal

2011-02-01T23:59:59.000Z

13

Terrain Classification With Conditional Random Fields  

E-Print Network [OSTI]

robot Thorin equipped with a Mini-ITX computer #12;The Four Considered Terrain Types 4Stefan LaibleStefan Laible, Yasir Niaz Khan and Andreas Zell · Grid-based approach [Khan et al. 2011] · Divide image into equally-sized grid cells · Classify each grid cell individually #12;· Thresholding yields a number in [0

Berns, Karsten

14

Intelligent terrain avoidance agent for General Aviation Free Flight  

E-Print Network [OSTI]

the pilot handle this responsibility, a hierarchical agent system is under development. This system will take information from traffic, weather, and terrain to determine a safe and efficient flight path. The terrain agent in this system must avoid Controlled...

Gesting, Paul

2013-02-22T23:59:59.000Z

15

Efficient Flow Computation on Massive Grid Terrain Datasets  

E-Print Network [OSTI]

As detailed terrain data becomes available, GIS terrain applications target larger geographic areas at ner resolutions. Processing the massive data involved in such applications presents signi cant challenges to GIS ...

Arge, Lars; Chase, Jeffry S.; Haplin, Patrick; Toma, Laura; Vitter, Jeffrey Scott; Urban, Dean; Wickremesinghe, Rajiv

2003-01-01T23:59:59.000Z

16

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

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

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

17

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

Open Energy Info (EERE)

Caldera Geothermal Region Retrieved from "http:en.openei.orgwindex.php?titleHigh-ResolutionAeromagneticMappingOfVolcanicTerrain,YellowstoneNationalPark&oldid...

18

Ris-PhD-Report Complex Terrain and Wind Lidars  

E-Print Network [OSTI]

calculations over the same terrains. The lidar performance was also simulated with the commercial software WAs;#12;Author: Ferhat Bingöl Title: Complex terrain and wind lidars Division: Wind Energy Division Risø-PhD-52 and the comparison of the measurement data with the flow model outputs showed that the mean wind speed calculated

19

Terrain sensing and estimation for dynamic outdoor mobile robots  

E-Print Network [OSTI]

In many applications, mobile robots are required to travel on outdoor terrain at high speed. Compared to traditional low-speed, laboratory-based robots, outdoor scenarios pose increased perception and mobility challenges ...

Ward, Christopher Charles

2007-01-01T23:59:59.000Z

20

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

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

MESOSCALE MODELLING OF WIND ENERGY OVER NON-HOMOGENEOUS TERRAIN  

E-Print Network [OSTI]

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

Pielke, Roger A.

22

Nathan Holmberg Modeling of Turbulent Water over Natural Terrain  

E-Print Network [OSTI]

Nathan Holmberg 2514355 1 Modeling of Turbulent Water over Natural Terrain Project Report Abstract of this project is to try to model flowing water in rivers, over waterfalls etc with the intent that the model can to represent certain effects, such as the motion of deep water waves to the exclusion of all else, to more

Goodman, James R.

23

A wind tunnel boundary-layer simulation of wind flow over complex terrain: Effect of terrain and model construction  

Science Journals Connector (OSTI)

The report presents the results of a wind-tunnel study of the flow of the natural wind over complex terrain. A 1:4000 undistorted scale model of Gebbies Pass in the South Island of New Zealand was prepared and...

D. Neal; D. C. Stevenson; D. Lindley

1981-11-01T23:59:59.000Z

24

Mechanisms initiating deep convection over complex terrain during COPS.  

SciTech Connect (OSTI)

Precipitating convection in a mountain region of moderate topography is investigated, with particular emphasis on its initiation in response to boundary-layer and mid- and upper-tropospheric forcing mechanisms. The data used in the study are from COPS (Convective and Orographically-induced Precipitation Study) that took place in southwestern Germany and eastern France in the summer of 2007. It is found that the initiation of precipitating convection can be roughly classified as being due to either: (i) surface heating and low-level flow convergence; (ii) surface heating and moisture supply overcoming convective inhibition during latent and/or potential instability; or (iii) mid-tropospheric dynamical processes due to mesoscale convergence lines and forced mean vertical motion. These phenomena have to be adequately represented in models in order to improve quantitative precipitation forecast. Selected COPS cases are analyzed and classified into these initiation categories. Although only a subset of COPS data (mainly radiosondes, surface weather stations, radar and satellite data) are used here, it is shown that convective systems are captured in considerable detail by sensor synergy. Convergence lines were observed by Doppler radar in the location where deep convection is triggered several hours later. The results suggest that in many situations, observations of the location and timing of convergence lines will facilitate the nowcasting of convection. Further on, forecasting of the initiation of convection is significantly complicated if advection of potentially convective air masses over changing terrain features plays a major role. The passage of a frontal structure over the Vosges - Rhine valley - Black Forest orography was accompanied by an intermediate suppression of convection over the wide Rhine valley. Further downstream, an intensification of convection was observed over the Black Forest due to differential surface heating, a convergence line, and the flow generated by a gust front.

Kottmeier, C.; Kalthoff, N.; Barthlott, C.; Corsmeier, U.; Van Baelen, J.; Coulter, R.; Environmental Science Division; Inst. for Meteorology and Climate Research; Lab. de Meteorologie Physique; Inst. of Physics and Meteorology

2008-12-01T23:59:59.000Z

25

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

26

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

E-Print Network [OSTI]

, social movements in France appeared to run out of raison d??tre, as enthusiasm for collective action gave away to a new individualism and, the Left, which was in power, along with the country itself started to confront the effects of a deregulated... RESISTING GLOBALIZATION ATTAC IN FRANCE: LOCAL DISCOURSES, GLOBAL TERRAIN A Dissertation by MARIE DES NEIGES LEONARD Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements...

Leonard, Marie des Neiges

2007-04-25T23:59:59.000Z

27

E-Print Network 3.0 - all terrain vehicles Sample Search Results  

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

terrain vehicles Search Powered by Explorit Topic List Advanced Search Sample search results for: all terrain vehicles Page: << < 1 2 3 4 5 > >> 1 EHS 2-14 December 2008 DEPARTMENT...

28

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

Science Journals Connector (OSTI)

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

2013-01-01T23:59:59.000Z

29

On-the-Fly Decompression and Rendering of Multiresolution Terrain  

SciTech Connect (OSTI)

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

30

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

SciTech Connect (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

31

Upcoming Funding Opportunity for Wind Forecasting Improvement Project in Complex Terrain  

Broader source: Energy.gov [DOE]

The DOE Wind Program has issued a Notice of Intent for a funding opportunity, tentatively titled Wind Forecasting Improvement Project in Complex Terrain.

32

Active Ankle Response for a 2-D Biped Robot with Terrain Contact Sensing  

E-Print Network [OSTI]

Active Ankle Response for a 2-D Biped Robot with Terrain Contact Sensing By Francis Hitschmann Submitted to the graduate degree program in Mechanical Engineering and the Graduate Faculty of the University of Kansas School... certifies that this is the approved Version of the following thesis: Active Ankle Response for a 2-D Biped Robot with Terrain Contact Sensing Committee: Chairperson* Date Approved...

Hitschmann, Francis Lee

2009-11-18T23:59:59.000Z

33

ADVANCED DIGITAL TERRAIN ANALYSIS USING ROUGNESS-DISSECTIVITY PARAMETERS IN GIS  

E-Print Network [OSTI]

1 ADVANCED DIGITAL TERRAIN ANALYSIS USING ROUGNESS-DISSECTIVITY PARAMETERS IN GIS Peter P. Siska is to develop new methods and procedures for terrain analyses within a GIS environment. The focus is to develop characteristics in one unified package and programmed in GIS using the ARC Macro Language (AML). The digital

Hung, I-Kuai

34

Axel Mobility Platform for Steep Terrain Excursions and Sampling on Planetary Surfaces  

E-Print Network [OSTI]

results that demonstrated Axel's ability to traverse both flat and sloped rocky terrain including 90º crater promontories. With its actuated trailing link, Axel can operate on both flat and sloped terrains° rocky slope in the JPL Mars Yard #12;2 To be able to access and cache samples from such deposits, we

35

Standardization of raw wind speed data under complex terrain conditions: A data-driven scheme  

Science Journals Connector (OSTI)

Abstract Direct usage of raw wind data without modification of topographic and/or terrain effects may result in remarkable errors. Thus, standardization of raw wind datasets is of great importance to remove these influences. But, the existing standardization methods are mainly applicable for flat terrains, which may become inappropriate under complex terrain conditions. This paper presents a data-driven standardization scheme which can be applied for different terrains including complex terrains. Although this scheme is established based on wind profile records at a reference station equipped with both an anemometer at a near-ground height and a Doppler radar profiler system, it can be used for the standardization of surface winds not only at the reference station but also at other surrounding stations with only surface observation instruments. Thus, the proposed data-driven scheme is efficient and economic. As applications of this scheme, correction factors to convert raw wind speeds at about 50 weather stations in Hong Kong to those over a reference terrain are estimated. To verify the effectiveness of the proposed standardization scheme, a wind tunnel testing involved the topographic model of a weather station has been conducted. The standardization results via the proposed scheme and the wind tunnel testing are in good agreement. The proposed methodology and relevant results can be used for the analysis of topographic effects on wind speeds over complex terrains.

Y.C. He; P.W. Chan; Q.S. Li

2014-01-01T23:59:59.000Z

36

Improvements in Terrain-Based Road Vehicle Localization By Initializing an Unscented Kalman Filter Using Particle Filters  

E-Print Network [OSTI]

the computational cost of the previous terrain- based localization algorithm. In order to localize a vehicle alongImprovements in Terrain-Based Road Vehicle Localization By Initializing an Unscented Kalman Filter of a road vehicle along a one-mile test track and 7 kilometer span of a highway using terrain

Brennan, Sean

37

Parallel air temperature measurements at the KNMI-terrain in De Bilt (the Netherlands) May 2003 April 2005  

E-Print Network [OSTI]

measurements at the KNMI-terrain in De Bilt (the Netherlands) Page 2 #12;Interim report Page 3 Table measurements at the KNMI-terrain in De Bilt (the Netherlands) Page 4 Foreword From May 2003 through April 2005Parallel air temperature measurements at the KNMI-terrain in De Bilt (the Netherlands) May 2003

Stoffelen, Ad

38

Speed Map for Autonomous Rovers over Rough Terrain  

E-Print Network [OSTI]

presented here: fuzzy logic, reactive control, and machineto speed control is to utilize fuzzy logic. Fuzzy logic wascontrol, this is a new area of research where reactive speed controller, fuzzy logic,

Loh, Jonathan Edau

2012-01-01T23:59:59.000Z

39

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

40

Adaptive dynamic locomotion of quadrupedal robots with semicircular feet on uneven terrain  

Science Journals Connector (OSTI)

This paper proposes an adaptive trajectory generation method for quadruped robots with semicircular feet to control body speed and heading, and to minimize power consumption on uneven terrain. The semicircular foot

Ohung Kwon; Sangdeok Park

2014-02-01T23:59:59.000Z

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.


41

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

42

Utilization of Specific Attenuation for Tropical Rainfall Estimation in Complex Terrain  

Science Journals Connector (OSTI)

To improve the accuracy of quantitative precipitation estimation (QPE) in complex terrain, a new rainfall rate estimation algorithm has been developed and applied on two C-band dual-polarization radars in Taiwan. In this algorithm, the specific ...

Yadong Wang; Pengfei Zhang; Alexander V. Ryzhkov; Jian Zhang; Pao-Liang Chang

2014-12-01T23:59:59.000Z

43

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

E-Print Network [OSTI]

. I propose a method for generating textures for 3D terrains using various approaches - in particular, a hybrid approach that integrates the concepts of cellular automata, probabilistic distribution according to height and Wang tiles. I also look...

Sinvhal, Swapnil

2007-04-25T23:59:59.000Z

44

Terrain Perception for DEMO III P. Bellutta, R. Manduchi, L Matthies, K. Owens, A. Rankin  

E-Print Network [OSTI]

XUV in- cludes a LADAR, a radar, and color and infrared (FLIR) cameras (visible on the front and implementation of algorithms for terrain per- ception at JPL. Only passive sensors (color and FLIR cameras

Manduchi, Roberto

45

Numerical study of wind energy characteristics over heterogeneous terrain Central Israel case study  

Science Journals Connector (OSTI)

A numerical mesoscale meteorological model has been applied over the heterogeneous terrain of central Israel in order to study wind energy characteristics of three typical synoptic situations. The supportive n...

Mordecay Segal; Ytzhaq Mahrer; Roger A. Pielke

1982-03-01T23:59:59.000Z

46

Identification of Health Risks in Workers Staying and Working on the Terrains Contaminated with Depleted Uranium  

Science Journals Connector (OSTI)

......the Terrains Contaminated with Depleted Uranium Snezana Milacic 1 * Jadranko...originated from ammunition containing depleted uranium (DU). The studied population...ionizing radiation. Health risks|Depleted uranium|Chromosome aberrations| J......

Snezana Milacic; Jadranko Simic

2009-05-01T23:59:59.000Z

47

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

Science Journals Connector (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

48

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

Science Journals Connector (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

49

ORIGINAL PAPER Effects of region, soil, land use, and terrain type on fuelwood  

E-Print Network [OSTI]

(sandy, sandy/loam, or rocky), land use (parkland agroforest or woodland), and terrain (flat, temporarily for Z. mauritiana, and on rocky soils for all species. Fuel- wood production of P. reticulatum

Paris-Sud XI, Université de

50

Double-stage genetic algorithm for wind farm layout optimization on complex terrains  

Science Journals Connector (OSTI)

This paper deals with the problem of optimal wind turbine micro siting on complex terrains. A realistic wind farm terrain can be very complex not only for the topography of the terrain but also for other factors. Such factors are the environmental impact of the wind farm the costs of land the costs of access roads wind turbine installation and maintenance costs the costs of electrical infrastructure etc. A grid-based wind farm model that takes all of these factors into consideration is proposed. For the purpose of an optimization algorithm a double-stage genetic algorithm is proposed. In the first stage the optimal micro-areas for wind turbine positioning are determined whereas the second stage defines precise optimal positions of wind turbine foundations. The double-stage genetic algorithm increases the accuracy of wind turbine positioning and decreases the dimensionality of the problem. The algorithm has been tested on a realistic wind farm terrain in Serbia.

Goran Dobri?

2014-01-01T23:59:59.000Z

51

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

Science Journals Connector (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

52

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

E-Print Network [OSTI]

in lowland depressions bounded by steep walls with arcuate fractures' [Sharp, 1973). By the end of the viking mission, chaotic terrain had been dis- covered in the Elysium and Chryse Plains. Since that time chaotic terrain has been closely examined... and Black, 1979; Carr, 1986; Carr, 1987]. The water may be stored as a large subsurface body of ice which is thickest at the poles, thinning toward the equator as a result of warming and increasing unstability of water in the atmosphere [Fanale, 1976...

Roberts, Sara Layne

2012-06-07T23:59:59.000Z

53

Modeling conically scanning lidar error in complex terrain with WAsP  

E-Print Network [OSTI]

the vertical wind speed W changes linearly with the downwind position x. This could crudely mimic the flow over to be homogeneous in order to deduce the horizontal wind speed. However, in mountainous or complex terrain this assumption is not valid implying an erroneous wind speed. The magnitude of this error is measured

54

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

55

Using Immersive 3D Terrain Models For Fusion Of UAV Surveillance Imagery  

E-Print Network [OSTI]

Using Immersive 3D Terrain Models For Fusion Of UAV Surveillance Imagery Sean Owens , Katia Sycara and Paul Scerri Carnegie Mellon University, Pittsburgh, PA, 15213, USA Teams of small and micro UAVs a single operator to utilize data from several UAVs and interact with the data in a more natural and less

Scerri, Paul

56

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

Science Journals Connector (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 (19922001) of the 40-yr ECMWF Re-Analysis ...

Kristian Horvath; Alica Baji?; Stjepan Ivatek-ahdan

2011-08-01T23:59:59.000Z

57

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

E-Print Network [OSTI]

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

Walden, Von P.

58

MESOSCALE SIMULATION OF ATMOSPHERIC RESPONSE TO CHAOS TERRAIN FORMATION. , S.C.R. Rafkin2  

E-Print Network [OSTI]

(kite@berkeley.edu), 2 Department of Space Studies, Southwest Research Institute, Boulder, Colorado associated with chaos terrain formation may mobilize sand and perhaps gravel, but not boulders. Model, momentum and moisture are parameter- ized using a Monin-Obukhov scheme. Boundary conditions: We flooded

Kite, Edwin

59

Melt and collapse of buried water ice: An alternative hypothesis for the formation of chaotic terrains on Mars  

E-Print Network [OSTI]

Melt and collapse of buried water ice: An alternative hypothesis for the formation of chaotic: T. Spohn Keywords: Mars chaotic terrain heat flux outflow channel Chaotic terrains if these features can form by melting and collapse of buried water ice in a confined basin. 2D thermal modelling

Utrecht, Universiteit

60

Investigation of Microphysical Parameters within Winter and Summer Type Precipitation Events over Mountainous [Complex] Terrain  

SciTech Connect (OSTI)

In this study we investigate complex terrain effects on precipitation with RAMS for both in winter and summer cases from a microphysical perspective. We consider a two dimensional east-west topographic cross section in New Mexico representative of the Jemez mountains on the west and the Sangre de Cristo mountains on the east. Located between these two ranges is the Rio Grande Valley. In these two dimensional experiments, variations in DSDs are considered to simulate total precipitation that closely duplicate observed precipitation.

Stalker, James R.; Bossert, James E.

1997-12-31T23:59:59.000Z

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

Building damage risk assessment on mining terrains in Poland with GIS application  

Science Journals Connector (OSTI)

The aim of the paper was to present an approach to building damage risk assessment on mining induced areas. The presented method was developed in Poland and then adopted in the other European countries. The method shown is based on a comparison between buildings strength and terrain deformation. Prediction principles of the mining terrain deformation and terrain categorization were described in the paper. Moreover a point method for a building strength to mining impact evaluation was discussed. It should be emphasized that the presented method is optimal for densely build-up areas. The authors proposed supporting actually applied method by GIS analyses. As a case study a densely build-up area influenced by an underground mining exploitation of one of the biggest Polish coal mines has been chosen. The application of the presented method supported by GIS on chosen area enables more automated assessment of building damage caused by mining activity. The procedure outlined in this paper may also be satisfactorily applied in the other counties which cope with the problem of building damage risk assessment optimization.

A. Malinowska; R. Hejmanowski

2010-01-01T23:59:59.000Z

62

Saving the soil: AgriLife units work to improve traning terrain  

E-Print Network [OSTI]

quality of supply reservoirs. The revegetation project began in 2003, and project members started evaluating the addition of composted dairy manure to primary training areas as a management practice. Compost enhances soil quality and promotes...Saving the soil AgriLife units work to improve training terrain Story by Melanie Orth txH2O | pg. 9 Heavy tanks and armored vehicles that have continually rolled over the 67,000-acre West Range at Fort Hood for the past 60 years have...

Orth, Melanie

2010-01-01T23:59:59.000Z

63

Saving the soil: AgriLife units work to improve training terrain  

E-Print Network [OSTI]

quality of supply reservoirs. The revegetation project began in 2003, and project members started evaluating the addition of composted dairy manure to primary training areas as a management practice. Compost enhances soil quality and promotes...Saving the soil AgriLife units work to improve training terrain Story by Melanie Orth txH2O | pg. 9 Heavy tanks and armored vehicles that have continually rolled over the 67,000-acre West Range at Fort Hood for the past 60 years have...

Orth, Melanie

2011-01-01T23:59:59.000Z

64

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

SciTech Connect (OSTI)

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

65

Investigation of model parameters for high-resolution wind energy forecasting: Case studies over simple and complex terrain  

Science Journals Connector (OSTI)

Abstract Wind power forecasting, turbine micrositing, and turbine design require high-resolution simulations of atmospheric flow. Case studies at two West Coast North American wind farms, one with simple and one with complex terrain, are explored using the Weather Research and Forecasting (WRF) model. Both synoptically and locally driven events that include some ramping are considered. The performance of the model with different grid nesting configurations, turbulence closures, and grid resolutions is investigated through comparisons with observation data. For the simple terrain site, no significant improvement in the simulation results is found when using higher resolution. In contrast, for the complex terrain site, there is significant improvement when using higher resolution, but only during the locally driven event. This suggests the possibility that computational resources could be spared under certain conditions, for example when the topography is adequately resolved at coarser resolutions. Physical parameters such as soil moisture have a very large effect, but mostly for the locally forced events for both simple and complex terrain. The effect of the PBL scheme choice varies significantly depending on the meteorological forcing and terrain. On average, prognostic TKE equation schemes perform better than non-local eddy viscosity schemes.

Nikola Marjanovic; Sonia Wharton; Fotini K. Chow

2014-01-01T23:59:59.000Z

66

Nuclear tools for characterising radiological dispersion in complex terrain: evaluation of regulatory and emergency response models  

Science Journals Connector (OSTI)

Routine operations of a nuclear research reactor and its facilities offer opportunities for collection of rare environmental tracer datasets which can be used for atmospheric dispersion model evaluation studies. The HIFAR reactor near Sydney, Australia, routinely emits the radioactive noble gas 41Ar, and other radionuclides such as 133Xe and 135Xe are also emitted from nearby radiopharmaceutical production facilities. Despite extremely low emission levels of these gases, they are nevertheless detectable using state-of-the-art technology, and sensitive detectors have been placed at four locations in the surrounding region which features complex terrain. The high research potential of this unique dataset is illustrated in the current study, in which predictions from two atmospheric dispersion models used for emergency response are compared with 41Ar peak observations from the detector network under a range of stability conditions, and long-term integrated data is also compared with a routine impact assessment model.

Alastair G. Williams; Geoffrey H. Clark; Leisa Dyer; Richard Barton

2005-01-01T23:59:59.000Z

67

Monitoring and reconstruction of a chairlift midway station in creeping permafrost terrain, Grchen, Swiss Alps  

Science Journals Connector (OSTI)

The midway station of a chairlift located in the ski resort Grchen (Swiss Alps) was originally built in 1997 at 2453m ASL in alpine permafrost terrain. The chairlift conveys 300,000330,000 passengers every winter season and constitutes an important link between two cable cars in the ski area. In winter 19971998, it became evident that the terrain at the mid-way station was unstable: one of the two concrete foundations started to creep and settle rapidly and cracks formed in the structure. To investigate the properties of the ground, two 25m boreholes were drilled near the foundations and equipped with inclinometer casings and thermistors. The presence of permafrost with an exceptionally thick active layer and a 20-m talik containing water was confirmed. The horizontal and vertical deformation rates of the ground attained very high values between 2002 and 2003. As a consequence, and in the interest of the safety of the passengers, the original midway station had to be destroyed and a specially developed new station was built in 2003. The excavation trench was lined with insulating material in order to avoid thermal disturbance of the underlying permafrost by hydration heat. The new foundation consists of a concrete T-girder with three point bearings. Repositioning of the entire structure in response to creep is possible, due to the unique character of the structural bearings which can be raised or lowered using hydraulic cylinders and steel plates. The thermal regime of the entire structure, ground temperatures and slope movements continue to be monitored to determine the long-term evolution of the mid-way station.

M. Phillips; F. Ladner; M. Mller; U. Sambeth; J. Sorg; Ph. Teysseire

2007-01-01T23:59:59.000Z

68

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

E-Print Network [OSTI]

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

Florida, University of

69

Microscope maps the graphene terrain A. E. Curtin, W. G. Cullen, M. S. Fuhrer, (Maryland MRSEC DMR 0520471)  

E-Print Network [OSTI]

Microscope maps the graphene terrain A. E. Curtin, W. G. Cullen, M. S. Fuhrer, (Maryland MRSEC DMR in the electrical potential on the surface of graphene on silicon carbide, shown here as different colors. KPM identifies single layer graphene (SLG), bilayer graphene (BLG), and two types of interfacial layer (IL1

Shapiro, Benjamin

70

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

SciTech Connect (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

71

Spotlight SAR interferometry for terrain elevation mapping and interferometric change detection  

SciTech Connect (OSTI)

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

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

1996-02-01T23:59:59.000Z

72

Groundwater favorability map using GIS multicriteria data analysis on crystalline terrain, So Paulo State, Brazil  

Science Journals Connector (OSTI)

Summary This paper presents the groundwater favorability mapping on a fractured terrain in the eastern portion of So Paulo State, Brazil. Remote sensing, airborne geophysical data, photogeologic interpretation, geologic and geomorphologic maps and geographic information system (GIS) techniques have been used. The results of cross-tabulation between these maps and well yield data allowed groundwater prospective parameters in a fractured-bedrock aquifer. These prospective parameters are the base for the favorability analysis whose principle is based on the knowledge-driven method. The multicriteria analysis (weighted linear combination) was carried out to give a groundwater favorability map, because the prospective parameters have different weights of importance and different classes of each parameter. The groundwater favorability map was tested by cross-tabulation with new well yield data and spring occurrence. The wells with the highest values of productivity, as well as all the springs occurrence are situated in the excellent and good favorability mapped areas. It shows good coherence between the prospective parameters and the well yield and the importance of GIS techniques for definition of target areas for detail study and wells location.

Vanessa Madrucci; Fabio Taioli; Carlos Csar de Arajo

2008-01-01T23:59:59.000Z

73

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

Science Journals Connector (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

74

Improving an Accuracy of ANN-Based Mesoscale-Microscale Coupling Model by Data Categorization: With Application to Wind Forecast for Offshore and Complex Terrain Onshore Wind Farms  

Science Journals Connector (OSTI)

The ANN-based mesoscale-microscale coupling model forecasts wind speed and wind direction with high accuracy for wind parks located in complex terrain onshore, yet some weather regimes remains unresolved and f...

Alla Sapronova; Catherine Meissner

2014-01-01T23:59:59.000Z

75

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

E-Print Network [OSTI]

relative to their size, and typically cannot accommodate the larger actuators required to compensate for the power loss by the flexible drive. This effect leads most actuators to use rigid drive systems or compliant actuators. Typical compliant... actuators used in biped develop consist of antagonistically paired pneumatic muscles [8-9]. Smart wire has been successful as a compliant actuator for small bipeds [10]. However, many bipeds still use electric motors or actuators with rigid drive...

Baker, Bryce C.

2010-07-28T23:59:59.000Z

76

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

E-Print Network [OSTI]

, parallelized, embedded control system was developed to provide the control structure for the Jaywalker. This system was chosen for its ability to execute simultaneous tasks efficiently. The two level control system provides a first level to implement a higher...

Strunk, Gavin

2010-12-10T23:59:59.000Z

77

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

SciTech Connect (OSTI)

The WRF model version 3.3 is used to simulate near hub-height winds and power ramps utilizing three commonly used planetary boundary-layer (PBL) schemes: Mellor-Yamada-Janji? (MYJ), University of Washington (UW), and Yonsei University (YSU). The predicted winds have small mean biases compared with observations. Power ramps and step changes (changes within an hour) consistently show that the UW scheme performed better in predicting up ramps under stable conditions with higher prediction accuracy and capture rates. Both YSU and UW scheme show good performance predicting up- and down- ramps under unstable conditions with YSU being slightly better for ramp durations longer than an hour. MYJ is the most successful simulating down-ramps under stable conditions. The high wind speed and large shear associated with low-level jets are frequently associated with power ramps, and the biases in predicted low-level jet explain some of the shown differences in ramp predictions among different PBL schemes. Low-level jets were observed as low as ~200 m in altitude over the Columbia Basin Wind Energy Study (CBWES) site, located in an area of complex terrain. The shear, low-level peak wind speeds, as well as the height of maximum wind speed are not well predicted. Model simulations with 3 PBL schemes show the largest variability among them under stable conditions.

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

2013-08-16T23:59:59.000Z

78

Modeling SF{sub 6} plume dispersion in complex terrain and meteorology with a limited data set  

SciTech Connect (OSTI)

Early actions of emergency responders during hazardous material releases are intended to assess contamination and potential public exposure. As measurements are collected, an integration of model calculations and measurements can assist to better understand the situation. This study applied a high resolution version of the operational 3-D numerical models used by Lawrence Livermore National Laboratory to a limited meteorological and tracer data set to assist in the interpretation of the dispersion pattern on a 140 km scale. The data set was collected from a tracer release during the morning surface inversion and transition period in the complex terrain of the Snake River Plain near Idaho Falls, Idaho in November 1993 by the United States Air Force. Sensitivity studies were conducted to determine model input parameters that best represented the study environment. These studies showed that mixing and boundary layer heights, atmospheric stability, and rawinsonde data are the most important model input parameters affecting wind field generation and tracer dispersion. Numerical models and limited measurement data were used to interpret dispersion patterns through the use of data analysis, model input determination, and sensitivity studies. Comparison of the best-estimate calculation to measurement data showed that model results compared well with the aircraft data, but had moderate success with the few surface measurements taken. The moderate success of the surface measurement comparison, may be due to limited downward mixing of the tracer as a result of the model resolution determined by the domain size selected to study the overall plume dispersion. 8 refs., 40 figs., 7 tabs.

Schalk, W.W. III

1996-10-01T23:59:59.000Z

79

Detecting volcanic resurfacing of heavily cratered terrain: Flooding simulations on the Moon using Lunar Orbiter Laser Altimeter (LOLA) data  

Science Journals Connector (OSTI)

Abstract Early extrusive volcanism from mantle melting marks the transition from primary to secondary crust formation. Detection of secondary crust is often obscured by the high impact flux early in solar system history. To recognize the relationship between heavily cratered terrain and volcanic resurfacing, this study documents how volcanic resurfacing alters the impact cratering record and models the thickness, area, and volume of volcanic flood deposits. Lunar Orbiter Laser Altimeter (LOLA) data are used to analyze three different regions of the lunar highlands: the Hertzsprung basin; a farside heavily cratered region; and the central highlands. Lunar mare emplacement style is assumed to be similar to that of terrestrial flood basalts, involving large volumes of material extruded from dike-fed fissures over relatively short periods of time. Thus, each region was flooded at 0.5km elevation intervals to simulate such volcanic flooding and to assess areal patterns, thickness, volumes, and emplacement history. These simulations show three primary stages of volcanic flooding: (1) Initial flooding is largely confined to individual craters and deposits are thick and localized; (2) basalt flows breach crater rim crests and are emplaced laterally between larger craters as thin widespread deposits; and (3) lateral spreading decreases in response to regional topographic variations and the deposits thicken and bury intermediate-sized and larger craters. Application of these techniques to the South Pole-Aitken basin shows that emplacement of ?1?2km of cryptomaria can potentially explain the paucity of craters 2064km in diameter on the floor of the basin relative to the distribution in the surrounding highlands.

Jennifer L. Whitten; James W. Head III

2013-01-01T23:59:59.000Z

80

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

E-Print Network [OSTI]

to make robotic movements to imitate human motion all over the world. Results of that effort are seen with robots now being able to accomplish tasks that were once performed solely human workers such as in factories, like automobile industries.........6 1.1 The advantage of the inductive touch sensor ..6 1.2 Basic theories involved in the robotic touch foot sensor.............9 1.3 Analysis of maximum impact power.....12 2. IMPLEMENTATION OF THE ROBOTIC TOUCH FOOT...

Lee, Hunwoo

2012-08-31T23:59:59.000Z

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

Creating Standards for Winter Terrain Parks  

E-Print Network [OSTI]

involvement in litigation. http://USTerrainParkCouncil.org #12;Muller, et al.(1995)- used EFH* to quantify

82

Surface Wind Regionalization in Complex Terrain  

Science Journals Connector (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. Jimnez; E. Garca-Bustamante; J. F. Gonzlez-Rouco; F. Valero; J. P. Montvez; J. Navarro

2008-01-01T23:59:59.000Z

83

Comparison of two terrain analysis models  

E-Print Network [OSTI]

. 0 F 0- 60s Dissected Land 0. 0 ' Open Water ~ EO-GO if slope &- 60 ~ CIA Country Studies ~ Host Nation Overlays ~ Host Nation Data Bases ~ Other National Assets Once the variables have been entered (map ID numbers, SS and SD) then F, snd...' a, , th, S ! , c 'ci'th Cia ala ~ ~ th Ntt l ! 't ! ! s r r, cia n l. , a n. s ni, s th a s, lhi h el!Cosa 10' lh C t Cl 'I Si ~ Cl lh Icr r- r ~ ir, ? 'ol isr lchsscatcctsc!Cctlhihlca, 'h' IW I ac, cise ci coo 0 ~ c jth t ~ ' ~ Is x ?I...

Arndt, F. Jeffrey Scott

2012-06-07T23:59:59.000Z

84

Transport and Dispersion in Complex Terrain  

Science Journals Connector (OSTI)

......recently along the mountain-plains interface near DOE's Rocky Flats Plant in Colorado. ASCOT meteorological experiments in January and February 1991 were coordinated with Rocky Flats tracer releases for airflow and dispersion model evaluations......

C.E. Elderkin; P.H. Gudiksen

1993-12-01T23:59:59.000Z

85

PROCESS SYSTEMS ENGINEERING Multivariable Terrain Methods  

E-Print Network [OSTI]

states in disk to vesicle transitions, finding the roots to the SAFT equation of state, and determining

Lucia, Angelo

86

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":""}]}

87

Stochastic Classification of Urban Terrain for Smart Wheelchair Navigation  

E-Print Network [OSTI]

the probability a point in the feature space belonged to one of four classes: grass, sidewalk, street (blacktop), or unknown. The stochastic model was generated a priori from literally millions of labeled point measurements a voice-commanded autonomous wheelchair intended for use in indoor environments. The Home, Lift, Position

Spletzer, John R.

88

The Trans/National Terrain of Anishinaabe Law and Diplomacy  

E-Print Network [OSTI]

Our Fire Survives the Storm: A Cherokee Literary History.Our Fire Survives the Storm: A Cherokee Literary History (

Bauerkemper, Joseph; Stark, Heidi Kiiwetinepinesiik

2012-01-01T23:59:59.000Z

89

Overland flow time of concentration on flat terrains  

E-Print Network [OSTI]

Li, and Benjamin Brown. I am also thankful to my friends for their moral support. These include Gaurav Garg, Srikanth Koka and Ashish Agrawal. vii TABLE OF CONTENTS Page ABSTRACT...

Chibber, Paramjit

2004-11-15T23:59:59.000Z

90

Optimizing Robust Limit Cycles for Legged Locomotion on Unknown Terrain  

E-Print Network [OSTI]

periodic control input, for many possible one-step solution trajectories (using ground profiles drawn from scheme can recover the known deadbeat open- loop control solution for the Spring Loaded Inverted Pendulum. Dai and R. Tedrake are with the Computer Science and Artificial Intelligence Lab, Massachusetts

Tedrake, Russ

91

Groundwater development in hardrock terrain using morphometric analysis  

Science Journals Connector (OSTI)

...rainfall is unevenly distributed (Kumar et al., 2005; Rodell et al., 2009...2003; Lin and Oguchi, 2006; Dinesh, 2008). Once the drainage network...of Geoscience, v.49, p.1-6. Kumar, R. , R.D. Singh, and K.D...

Imran Ahmad Dar; K. Sankar; Mithas Ahmad Dar

92

Walking and Running of a Quadruped Robot on Irregular Terrain  

E-Print Network [OSTI]

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

Kimura, Hiroshi

93

Rough Diagrams Laurent Vigneron  

E-Print Network [OSTI]

that are not tautologies of modal logic S5. 1 Generalized Rough Sets The idea of rough set was proposed by Pawlak in 1982 [5]. The starting point of the rough set theory is the assumption that we have initially some informa have de#12;ned the notion of generalized rough sets: any topological space (X; I) with a clopen sets

Vigneron, Laurent

94

Rough Approximate Operators: Axiomatic Rough Set Theory  

Science Journals Connector (OSTI)

In rough set theory, the upper and lower approximations are ... are two abstract operators acting on the power set of U, the universe of discourse. ... The proof is an easy application of point set topology. Simi...

T. Y. Lin; Qing Liu

1994-01-01T23:59:59.000Z

95

Design of robotic quadruped legs  

E-Print Network [OSTI]

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

McKenzie, Jacob Elijah

2012-01-01T23:59:59.000Z

96

Elementary Rough Set Granules: Toward a Rough Set Processor  

Science Journals Connector (OSTI)

In this chapter, the basics of the rough set approach are presented, and an outline of ... of a simple processor is based on elementary rough set granules and dependencies between them. The rough set processor (R...

Zdzis?aw Pawlak

2004-01-01T23:59:59.000Z

97

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

E-Print Network [OSTI]

, invasive species, security training activities, offshore oil and gas exploration, and coral bleaching the western Pacific. #12;3 Introduction The high productivity of coral reef ecosystems demands a quantifiable to increasing coastal populations (Culliton 1998). Natural and anthropogenic processes threaten natural

Wright, Dawn Jeannine

98

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

Science Journals Connector (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. Jimnez; J. Fidel Gonzlez-Rouco; Elena Garca-Bustamante; Jorge Navarro; Juan P. Montvez; Jordi Vil-Guerau de Arellano; Jimy Dudhia; Antonio Muoz-Roldan

2010-02-01T23:59:59.000Z

99

Terrain Reconstruction from Contour Maps Abigail Martinez Rivas and Luis Gerardo de la Fraga  

E-Print Network [OSTI]

, ultrasound, and nuclear magnetic resonance, supply several cuts through the object under study [1, but the disadvantage that they can not be easily converted to a useful digital format. Due to the high cost of direct diagram and its dual, the Delaunay triangulation. The idea is to construct a graph over a set

Fraga, Luis Gerardo de la

100

American Institute of Aeronautics and Astronautics A General Approach to Terrain Relative Navigation  

E-Print Network [OSTI]

exploration1 contains landing and sample return missions to the Moon, Mars, Europa, Titan, comets Navigation for Planetary Landing Andrew E. Johnson* , Adnan Ansar and Larry H. Matthies Jet Propulsion for navigation state estimation during planetary descent to enable precision landing. The algorithm automatically

Roumeliotis, Stergios I.

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

Validation of Small Scale Prognostic Air Pollution Modeling System in Highly Complex Terrain  

Science Journals Connector (OSTI)

In some areas of Slovenia air pollution is still a major problem due to ... local domestic heating and complex topography. PM10 pollution is a severe problem as there are ... , domestic heating, traffic and other...

Primo Mlakar; Botjan Grai?

2014-01-01T23:59:59.000Z

102

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

E-Print Network [OSTI]

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

Valasek, John

103

Flight Simulator Evaluation of an Integrated Synthetic and Enhanced Vision System for Terrain Avoidance  

E-Print Network [OSTI]

-time EVS sensor imagery: a. Inset of alpha-blending of FLIR on PFD; b. Optimal Fusion of FLIR and SVIS; and c. Integration of FLIR on HUD raster channel. The particular study presented in this paper focused on

Kaber, David B.

104

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

E-Print Network [OSTI]

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

Perez, Richard R.

105

Design and editing 2.5-dimensional terrain in StarLogo TNG  

E-Print Network [OSTI]

StarLogo TNG is "The Next Generation" in block-based decentralized programming for modeling and simulation software. Its aim is to make computer programming more appealing for students in middle school and high school. ...

Wendel, Daniel J

2006-01-01T23:59:59.000Z

106

E-Print Network 3.0 - all-terrain vehicle accidents Sample Search...  

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

Chemistry ; Biology and Medicine 3 U of L Campus AccidentIncident Report Automobile AccidentIncident Page 1 of 2 University of Lethbridge Summary: U of L Campus...

107

Hydrologic modeling using triangulated irregular networks : terrain representation, flood forecasting and catchment response  

E-Print Network [OSTI]

Numerical models are modern tools for capturing the spatial and temporal variability in the land-surface hydrologic response to rainfall and understanding the physical relations between internal watershed processes and ...

Vivoni, Enrique R. (Enrique Rafael), 1975-

2003-01-01T23:59:59.000Z

108

E-Print Network 3.0 - all-terrain mobile platform Sample Search...  

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

4 s s s 12;Georgia Tech ... Source: Georgia Institute of Technology, Mobile Robot Laboratory Collection: Engineering ; Computer Technologies and Information Sciences 3...

109

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

E-Print Network [OSTI]

for the Study Streams. . . . . 41 3 Data Summary for Pools in Each Study Reach . . 51 4 Kruskal-Wallis Test for Grouped Comparison of the Study Reaches. . 55 5 Dunn's Multiple Comparison of Kruskal-Wallis for All Pools. 56 6 Length of Trails/Roads Present... for the Study Streams. . . . . 41 3 Data Summary for Pools in Each Study Reach . . 51 4 Kruskal-Wallis Test for Grouped Comparison of the Study Reaches. . 55 5 Dunn's Multiple Comparison of Kruskal-Wallis for All Pools. 56 6 Length of Trails/Roads Present...

Rohrer, Deven Michelle

2012-06-07T23:59:59.000Z

110

Identification of Health Risks in Workers Staying and Working on the Terrains Contaminated with Depleted Uranium  

Science Journals Connector (OSTI)

......p 105185. 5. UNEP. (2001) Depleted Uranium in Kosovo. Post Conflict Environmental...pp 98115. 6. UNEP. (2002) Depleted Uranium in Serbia and Montenegro Post...Lundin, A. (2004) Incidence of cancer among Swedish military and civil......

Snezana Milacic; Jadranko Simic

2009-05-01T23:59:59.000Z

111

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

E-Print Network [OSTI]

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

Pollefeys, Marc

112

Record of mid-Archaean subduction from metamorphism in the Barberton terrain, South Africa  

Science Journals Connector (OSTI)

... during this time is particularly controversial because characteristic subduction-related mineral assemblages, typically documenting apparent geothermal gradients of 15?C?km-1 or less, have not yet been recorded from ... , have not yet been recorded from in situ Archaean rocks (the lowest recorded apparent geothermal gradients are greater than 25?C?km-1). Despite this absence from the ...

Jean-Franois Moyen; Gary Stevens; Alexander Kisters

2006-08-03T23:59:59.000Z

113

Estimating the spatial and temporal distribution of snow in mountainous terrain  

E-Print Network [OSTI]

snowmelt rates in a mixed conifer forest. Agricultural andsolar radiation in boreal conifer forests: Measurements andsnowmelt rates in a mixed conifer forest, Agricultural and

Musselman, Keith Newton

2012-01-01T23:59:59.000Z

114

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

Broader source: Energy.gov [DOE]

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

115

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

E-Print Network [OSTI]

, the vehicle tracking performance of these algorithms using low-cost inertial sensors with inferior low-cost inertial sensors with inferior specifications are used. However, the precision of vehicle. The results also indicate that as sensor cost increases, the variance in vehicle tracking error asymptotically

Brennan, Sean

116

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

SciTech Connect (OSTI)

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

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

2014-08-01T23:59:59.000Z

117

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

E-Print Network [OSTI]

Ackery, et al. [6] found evidence of an increasing incidence of traumatic brain injury and spinal cord

118

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

E-Print Network [OSTI]

with open circles). The resolved-scale eddy term is shown by stars (no line), with the background viscous part then being the di erence between the net resolved-scale and resolved-scale eddy parts. : : : : : : : : : : : 36 16 Schematic sea breeze system... breeze and mesoscale convective systems. Gravity wave momentum transport away from topography in particular plays an important role in the momentum budget of the atmosphere and hence the general circulation. The present study addresses two aspects...

Qian, Tingting

2010-07-14T23:59:59.000Z

119

Identification of Health Risks in Workers Staying and Working on the Terrains Contaminated with Depleted Uranium  

Science Journals Connector (OSTI)

......ionizing radiation. Health risks|Depleted uranium|Chromosome aberrations...and Jadranko SIMIC2 Health risks/Depleted uranium/Chromosome aberrations...Institute symposia "The Health Effects of Depleted Uranium." Remarks and slides......

Snezana Milacic; Jadranko Simic

2009-05-01T23:59:59.000Z

120

header for SPIE use Real-Time Weather Data on Terrain  

E-Print Network [OSTI]

behave in the presence of hills or mountains and other features. Keywords: Real-time visualization into a global geospatial structure based on a forest of quadtrees [Dav98, Dav99, Fau00]. Even the volumetric

Shaw, Chris

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

Escorted Ethnography: Ethics, the Human Terrain System and American Anthropology in Conflict  

E-Print Network [OSTI]

2008. Moment of Truth in Iraq. United States: Richardand Jessica Delaney. eds. 2007. Iraq under the surge. TheIssue 02. April 1. 2008. Iraq after the surge: Governance

Daily, Eric

2010-01-01T23:59:59.000Z

122

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

E-Print Network [OSTI]

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...

Fernandes, Roland Anthony Savio

2009-05-15T23:59:59.000Z

123

Wheel Design and Tension Analysis for the Tethered Axel Rover on Extreme Terrain  

E-Print Network [OSTI]

and then present our experimental results from testing with different wheel designs on flat, sloped, and rocky

124

A Computer System for Simulating the Transfer of Pollutants over Complex Terrain - Some Recent Applications  

Science Journals Connector (OSTI)

......Some of the recent applications of the Euridice code system are presented here, including simulations of the ASCOT Rocky Flats experiments and dispersion in the Greater Athens area....

N. Catsaros; D. Robeau; J.G. Bartzis; M. Varvayanni; A. Megaritou; K. Konte

1993-12-01T23:59:59.000Z

125

Mapping offshore sedimentary structure using electromagnetic methods and terrain effects in marine magnetotelluric data  

Science Journals Connector (OSTI)

......temperature, which follows a geothermal gradient of 25.4 8...man-made source of energy is measured, are also...reconnaissance, a low-cost alternative to the use...the seafloor, at the cost of greater algorithmic...linear relationship and a geothermal gradient of 25.4 K......

Steven Constable; Kerry Key; Lisl Lewis

2009-02-01T23:59:59.000Z

126

Human estimation of slope, distance, and height of terrain in simulated lunar conditions  

E-Print Network [OSTI]

As NASA's Vision for Space Exploration seeks to explore mountainous regions near the southern pole through frequent, long excursions, astronauts will require accurate navigational assistance. Current and future technology, ...

Oravetz, Christopher

2009-01-01T23:59:59.000Z

127

High compliance all-terrain transport and heavy cargo hybrid bicycle  

E-Print Network [OSTI]

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

Pino, Andres (Andres J.)

2006-01-01T23:59:59.000Z

128

High compliance all-terrain transport and heavy cargo hybrid bicycle  

E-Print Network [OSTI]

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

Soto-Fernndez, Orlando

2005-01-01T23:59:59.000Z

129

The HelioMont method for assessing solar irradiance over complex terrain: Validation and improvements  

Science Journals Connector (OSTI)

Abstract This study evaluates the suitability of the method HelioMont, developed by MeteoSwiss, for estimating solar radiation from geostationary satellite data over the Alpine region. The algorithm accounts for the influence of topography, clouds, snow cover and the atmosphere on incoming solar radiation. The main error sources are investigated for both direct and diffuse solar radiation components by comparison with ground-based measurement taken at three sites, namely Bolzano (IT), Davos (CH) and Payerne (CH), encompassing different topographic conditions. The comparison shows that the method provides high accuracy of the yearly cycle: the Mean Absolute Bias (MAB) is below 5Wm?2 at the lowland station Payerne and below 12Wm?2 at the other two mountainous stations for the monthly averages of global and diffuse radiation. For diffuse radiation the MAB is in the range 1115Wm?2 for daily means and 3440Wm?2 for hourly means. It is found that the largest errors in diffuse and direct radiation components on shorter time scales occur during summer and for cloud-free days. In both Bolzano and Davos the errors for daily-mean diffuse radiation can exceed 50Wm?2 under such conditions. As HelioMont uses monthly climatological values of atmospheric aerosol characteristics, the effects of this approximation are investigated by simulating clear-sky solar radiation with the radiative transfer model (RTM) libRadtran using instantaneous aerosol measurements. Both ground-based and satellite-based data on aerosol optical properties and water vapor column amount are evaluated. When using daily atmospheric input the estimation of the hourly averages improves significantly and the mean error is reduced to 1020Wm?2. These results suggest the need for a more detailed characterization of the local-scale clear-sky atmospheric conditions for modeling solar radiation on daily and hourly time scales.

M. Castelli; R. Stckli; D. Zardi; A. Tetzlaff; J.E. Wagner; G. Belluardo; M. Zebisch; M. Petitta

2014-01-01T23:59:59.000Z

130

Rough Ride Test Procedure  

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

131

Improvement of Information Rough Communication on Rough Set  

Science Journals Connector (OSTI)

The concept of information rough communication based on knowledge base is proposed by Mousavi Amin, Jabedar-Maralani Parviz. In this paper, its limitation is discussed. The concept of information rough communi...

QinLi An

2011-01-01T23:59:59.000Z

132

On Generalized Rough Sets (extended abstract)  

E-Print Network [OSTI]

On Generalized Rough Sets (extended abstract) Anita Wasilewska Department of Computer Science State Rough Sets The idea of rough set was proposed by Pawlak in 1982 [10]. The starting point of the rough a rough set. The lower and upper approximations treated as one argument operations R and R in the ap

Vigneron, Laurent

133

COMBINATION OF ROUGH AND FUZZY SETS  

E-Print Network [OSTI]

1 COMBINATION OF ROUGH AND FUZZY SETS BASED ON -LEVEL SETS Y.Y. Yao Department of Computer Science set can be represented by a family of crisp sets using its -level sets, whereas a rough set can involved in the combination of rough-set and fuzzy-set models. The rough-fuzzy-set and fuzzy-rough-set

Yao, Yiyu

134

Plasma Radiation by Rough Surfaces  

Science Journals Connector (OSTI)

The recent observation of a peak of scattered radiation at the plasma frequency from thin metal foils irradiated with light can be explained in terms of a small amount of surface roughness of the foils.

Edward A. Stern

1967-12-04T23:59:59.000Z

135

Disk Roughness and Defect Monitoring  

Science Journals Connector (OSTI)

Disk surface monitoring and certification refer to the testing and certification of a disk surface in terms of roughness and defect ... as well as the capability to accommodate a flying slider. It includes glide ...

Gang Sheng; Jizhong He; Shuanlin Duan

2013-01-01T23:59:59.000Z

136

Design of Rough Neurons: Rough Set Foundation and Petri Net Model  

Science Journals Connector (OSTI)

This paper introduces the design of rough neurons based on rough sets. Rough neurons instantiate approximate reasoning in assessing knowledge ... to classifying inputs. The particular form of rough neuron conside...

J. F. Peters; A. Skowron; Z. Suraj; L. Han

2010-01-01T23:59:59.000Z

137

Rough Set Approach to KDD (Extended Abstract)  

Science Journals Connector (OSTI)

This tutorial is a survey on rough set theory and some of its applications in ... to analysis of different real life problems using rough set methods as well as the presentation of Rough Set Exploration System (R...

Hung Son Nguyen; Andrzej Skowron

2008-01-01T23:59:59.000Z

138

Rough Sets in Economy and Finance  

Science Journals Connector (OSTI)

The Rough Set Theory makes it possible to represent and ... of the currently available literature covering applications of rough sets in the economy and finance. The classical rough set model and its important ex...

Mariusz Podsiad?o; Henryk Rybi?ski

2014-01-01T23:59:59.000Z

139

Rough sets determined by tolerances  

Science Journals Connector (OSTI)

Abstract We show that for any tolerance R on U, the ordered sets of lower and upper rough approximations determined by R form ortholattices. These ortholattices are completely distributive, thus forming atomistic Boolean lattices, if and only if R is induced by an irredundant covering of U, and in such a case, the atoms of these Boolean lattices are described. We prove that the ordered set RS of rough sets determined by a tolerance R on U is a complete lattice if and only if it is a complete subdirect product of the complete lattices of lower and upper rough approximations. We show that R is a tolerance induced by an irredundant covering of U if and only if RS is an algebraic completely distributive lattice, and in such a situation a quasi-Nelson algebra can be defined on RS. We present necessary and sufficient conditions which guarantee that for a tolerance R on U, the ordered set RS X is a lattice for all X ? U , where R X denotes the restriction of R to the set X and RS X is the corresponding set of rough sets. We introduce the disjoint representation and the formal concept representation of rough sets, and show that they are DedekindMacNeille completions of RS.

Jouni Jrvinen; Sndor Radeleczki

2014-01-01T23:59:59.000Z

140

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":""}]}

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

TOPOLOGICAL AND FUZZY ROUGH SETS Department of  

E-Print Network [OSTI]

TOPOLOGICAL AND FUZZY ROUGH SETS T. Y. Lin Department of Mathematics and Computer Science San Jose is studied via rough sets, fuzzy sets and topological spaces (more precisely, Frechet spaces). Rough set a knowledge base [1](pp. 14). Pawlak's rough set theory can be viewed as a study of concepts or knowledge via

Lin, Tsau Young

142

Trees, rough integration and differential equations  

E-Print Network [OSTI]

on the trajectory (x,y). mg (orsay) trees, rough paths, ... 3 / 27 #12;Trees L finite set. Trees labeled by L , TLTrees, rough integration and differential equations Massimiliano Gubinelli Laboratoire de Mathématiques Université Paris-Sud XI mg (orsay) trees, rough paths, ... 1 / 27 #12;Rough paths T. Lyons (Oxford

Gubinelli, Massimiliano

143

The Rough Set Engine GROBIAN Ivo Dntsch  

E-Print Network [OSTI]

The Rough Set Engine GROBIAN Ivo Düntsch School of Information and Software Engineering University semantische Informationsverarbeitung Universität Osnabrück Abstract Rough set analysis is a non rough set data analysis. In addition to the "traditional" procedures of rough set analysis

Düntsch, Ivo

144

Rough Set Theory: An Introduction  

Science Journals Connector (OSTI)

In rough set theory, knowledge is interpreted as an ability...a, 81b]). These objects form a set called often a universe of discourse and their nature may vary from case to case: they may be e.g. medical patients...

Prof. Dr. Lech Polkowski

2002-01-01T23:59:59.000Z

145

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

E-Print Network [OSTI]

depth (PBLD), (b) vertical wind speed (w), (c) latent heatdepth (PBLD), (b) vertical wind speed (w), (c) latent heatdepth (PBLD) and (b) vertical wind speed (w) versus water

Rihani, Jehan

2010-01-01T23:59:59.000Z

146

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

E-Print Network [OSTI]

Wind Energy Association Windpower 2008 Conference, AmericanWind Energy Association Windpower 2006 Conference, American

Lundquist, Katherine Ann

2010-01-01T23:59:59.000Z

147

Radon hazard and risk in Sussex, England and the factors affecting radon levels in dwellings in chalk terrain  

Science Journals Connector (OSTI)

......Arithmetic mean Bq m3 Standard deviation Bq...England: 1997 Review. NRPB Report...Distribution de l'uranium, du thorium...was analysed to plan more spe-cific...those from NRPB standard dwelling surveys...study area are uranium series elements...SurfacegeologyArithmeticmean Bqm 3 Standard deviation Bqm......

I. R. Killip

2005-04-01T23:59:59.000Z

148

Day-Ahead Predictability of Complex Terrain Flows for Wind Resource Production: A Case Study of the Washoe Zephyr  

Science Journals Connector (OSTI)

A detailed description of the meteorological conditions of the Washoe Valley (Nevada) and simulations that examine the predictability of the westerly high wind event known as the Washoe Zephyr are presented. Numerical weather model prediction ...

Craig M. Smith; Darko Kora?in; Kristian Horvath

2014-12-01T23:59:59.000Z

149

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

E-Print Network [OSTI]

of Electric Power Industry, Chiba, Japan FOTINI KATOPODES CHOW Department of Civil and Environmental to the choice of numerical simulation parameters than is typically needed for mean wind field predictions. Large-eddy simulation is used in a mesoscale setting, providing modeling advantages through the use of robust turbulence

Chow, Fotini Katopodes

150

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

E-Print Network [OSTI]

in todays numerical weather prediction models is stillability of a numerical weather prediction model to predictthe context of numerical weather prediction models. The two-

Lundquist, Katherine Ann

2010-01-01T23:59:59.000Z

151

Radon hazard and risk in Sussex, England and the factors affecting radon levels in dwellings in chalk terrain  

Science Journals Connector (OSTI)

......people, it poses a serious health risk(1,2). Prior to the...Institute of Environmental Health Officers (IEHO, now the Chartered...Letter to Chief Environmental Health Officers, 11 November 1999...Resistance to Moisture: C2 Dangerous and Offensive Substances......

I. R. Killip

2005-04-01T23:59:59.000Z

152

Prognostic Framing of Stakeholders Subjectivities: A Case of All-Terrain Vehicle Management on State Public Lands  

Science Journals Connector (OSTI)

These social and ecological issues provoke dispute episodes that cumulatively characterize...2009). Other management efforts have followed, including the classification of state forests as either open or closed t...

Stanley T. Asah; David N. Bengston; Keith Wendt; Leif DeVaney

2012-01-01T23:59:59.000Z

153

Abstract--As sensor networks are deployed over various terrains, the complexity of their topology continues to grow.  

E-Print Network [OSTI]

routing algorithms, on-demand routing algorithms such as AODV [2] are popular, while their flooding.timmermann}@uni-rostock.de 2 Colorado School of Mines, USA 2 qhan@mines.edu Fig. 1. An example of Greedy and MFR geographical

Han, Qi "Chee"

154

Terrain-Induced Turbulence Intensity during Tropical Cyclone Passage as Determined from Airborne, Ground-Based, and Remote Sensing Sources  

Science Journals Connector (OSTI)

Low-level turbulence [rapid headwind fluctuations below 1600 ft (500 m)] poses potential safety hazards to landing/departing aircraft and is capable of disrupting air traffic. Timely, accurate alerts of low-level turbulence require reliable ...

Kai-Kwong Hon; Pak-Wai Chan

2014-11-01T23:59:59.000Z

155

Rough and fuzzy-rough methods for mammographic data Neil Mac Parthalain, Richard Jensen, Qiang Shen  

E-Print Network [OSTI]

in- vestigates the application of a number of rough set and fuzzy-rough set techniques to mammo for classification using rough sets, and fuzzy-rough sets and applied to this mammographic data, incorporating. In section 3, the fuzzy-rough set methodology and its application to both feature selection and the nearest

Lucas, Simon M.

156

A Rough Set Paradigm for Unifying Rough Set Theory and Fuzzy Set Theory  

Science Journals Connector (OSTI)

In this plenary address, we would like to discuss rough inclusions defined in Rough Mereology, a joint idea with A. ... , as a basis for common models for rough as well as fuzzy set theories. We would like to jus...

Lech Polkowski

2003-01-01T23:59:59.000Z

157

A New Treatment of Rough Surface Scattering  

Science Journals Connector (OSTI)

...1996 research-article A New Treatment of Rough Surface Scattering C. Macaskill P...narrow beam at a randomly rough surface where the height distribution...is Gaussian. The field at the surface is assumed to satisfy a Dirichlet...

1996-01-01T23:59:59.000Z

158

A Review of Rough Set Models  

Science Journals Connector (OSTI)

Since introduction of the theory of rough set in early eighties, considerable work has been ... The paper provides a review of the Pawlak rough set model and its extensions, with emphasis on ... the formulation, ...

Y. Y. Yao; S. K. M. Wong; T. Y. Lin

1997-01-01T23:59:59.000Z

159

A Rough Logic Formalism for Fuzzy Controllers  

E-Print Network [OSTI]

A Rough Logic Formalism for Fuzzy Controllers: A Hard and Soft Computing View T.Y. Lin Department are the design goal. Several new applications are identified. KEYWORDS: control, fuzzy logic, modal logic, rough process, called rough logic government, is proposed. In this process, fuzzy logic is viewed

Lin, Tsau Young

160

Electrokinetic transport in microchannels with random roughness  

SciTech Connect (OSTI)

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

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

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.


161

Rough Set Approximations in Formal Concept Analysis  

E-Print Network [OSTI]

Rough Set Approximations in Formal Concept Analysis Y.Y. Yao, Yaohua Chen Department of Computer}@cs.uregina.ca Abstract-- An important topic of rough set theory is the approximation of undefinable sets or concepts of approximation operators. In this paper, the notion of rough set approximations is introduced into formal concept

Yao, Yiyu

162

Vaguely Quantified Rough Sets Chris Cornelis1  

E-Print Network [OSTI]

Vaguely Quantified Rough Sets Chris Cornelis1 , Martine De Cock1 , and Anna Maria Radzikowska2 1@mini.pw.edu.pl Abstract. The hybridization of rough sets and fuzzy sets has focused on creating an end product they allow for gradual membership, fuzzy rough sets are still abrupt in a sense that adding or omitting

Gent, Universiteit

163

Intuitionistic fuzzy rough sets: at the cross-  

E-Print Network [OSTI]

U N C O R R EC TED PR O O F Intuitionistic fuzzy rough sets: at the cross- roads of imperfect: Just like rough set theory, fuzzy set theory addresses the topic of dealing with imperfect knowledge tentative definitions of the concept of an `intuitionistic fuzzy rough set' that were raised in their wake

Gent, Universiteit

164

A REVIEW OF ROUGH SET MODELS  

E-Print Network [OSTI]

1 A REVIEW OF ROUGH SET MODELS Y.Y. Yao*, S.K.M. Wong**, and T.Y. Lin*** * Department of Computer of rough set in early eighties, considerable work has been done on the development and application of this new theory. The paper provides a review of the Pawlak rough set model and its extensions

Lin, Tsau Young

165

Rough Sets and Matroids Victor W. Marek  

E-Print Network [OSTI]

Rough Sets and Matroids Victor W. Marek Department of Computer Science, University of Kentucky of that and related facts for the development of Rough Sets theory. 1 Introduction The goal of this note is to provide a proof of the recent statement by Liu and Zhu [2] and look at some properties of rough sets related

Marek, Victor W.

166

Rough Set Approximations in Formal Concept Analysis  

E-Print Network [OSTI]

Rough Set Approximations in Formal Concept Analysis Yiyu Yao and Yaohua Chen Department of Computer}@cs.uregina.ca Abstract. A basic notion shared by rough set analysis and formal concept anal- ysis is the definability to each other based on defin- ability. In this paper, the notion of rough set approximations is introduced

Yao, Yiyu

167

Wetting of rough surfaces: a homogenization approach  

Science Journals Connector (OSTI)

...plane xd = 0, and it is rough at a scale , where is...A (2005) Wetting of rough surfaces: a homogenization...where S1 is a closed set in Rd such that {xd 0...is finite, then L is a set with finite perimeter...A (2005) Wetting of rough surfaces: a homogenization...

2005-01-01T23:59:59.000Z

168

Ordered Weighted Average Based Fuzzy Rough Sets  

E-Print Network [OSTI]

Ordered Weighted Average Based Fuzzy Rough Sets Chris Cornelis 1 , Nele Verbiest1 , and Richard rough set model, which is based on a similar rationale, our proposal has the ad- vantage a feature selection application confirm the potential of the OWA-based model. Keywords: fuzzy rough sets

Gent, Universiteit

169

A logic for rough sets Ivo Dntsch  

E-Print Network [OSTI]

A logic for rough sets Ivo Düntsch School of Information and Software Engineering, University of a set forms a Boolean algebra under the usual set theoretic operations, while the collection of rough that regular double Stone algebras are a class of algebras appropriate for a logic of rough sets. Using

Düntsch, Ivo

170

ROUGH AND MODAL ALGEBRAS Laurent VIGNERON  

E-Print Network [OSTI]

automatically by the theorem prover. 1. INTRODUCTION The theory of rough sets provides a methodological frame, and market analysis. We present here two new connections for the rough set theory. We link]) relationship between the rough sets and modal S5 logic, and hence with some topological Boolean algebras

Vigneron, Laurent

171

Textures and covering based rough sets  

Science Journals Connector (OSTI)

This paper introduces the relations between covering and dicovering in the framework of rough sets. The natural counterpart of a covering in textures is given by a family of pairs of sets which is called a dicovering. This leads us to two dual concepts ... Keywords: Covering based approximation operators, Dicovering, Rough set, Textural rough set, Texture space

Murat Diker; Ay?egl Altay U?ur

2012-02-01T23:59:59.000Z

172

Dominance-Based Rough Set Approach and Bipolar Abstract Rough Approximation Spaces  

Science Journals Connector (OSTI)

We take into consideration Dominance-based Rough Set Approach and its recently proposed algebraic modeling...

Salvatore Greco; Benedetto Matarazzo

2008-01-01T23:59:59.000Z

173

Attribute Selection Methods in Rough Set Theory.  

E-Print Network [OSTI]

?? Attribute selection for rough sets is an NP-hard problem, in which fast heuristic algorithms are needed to find reducts. In this project, two reduct (more)

Li, Xiaohan

2014-01-01T23:59:59.000Z

174

J Flud X e c h (1984),vol 142. p p 201-216 Printed 7n (:rent Hfttain  

E-Print Network [OSTI]

estimations of air-pollution dispersion, or of the potential for wind-energy conversion systems (WECS- pollution dispersion and the exploitation of wind energy in rough terrain. The discussions led to agreement techniques in remote sensing for improving understanding of flow in rough terrain, the factors determining

Hunt, Julian

175

Generalizing Rough Set Theory Through Dominance-Based Rough Set Approach  

Science Journals Connector (OSTI)

Ordinal properties of data related to preferences have been taken into account in the Dominance-based Rough Set Approach (DRSA). We show that DRSA ... a very general framework in which the classical rough set app...

Salvatore Greco; Benedetto Matarazzo

2005-01-01T23:59:59.000Z

176

The evolutionary development of roughness prediction models  

Science Journals Connector (OSTI)

The vigorous expansion of wind energy power generation over the last decade has also entailed innovative improvements to surface roughness prediction models applied to high-torque milling operations. Artificial neural networks are the most widely used ... Keywords: Dimensionality reduction, Genetic algorithm, High-torque milling, Surface roughness

Maciej Grzenda; Andres Bustillo

2013-05-01T23:59:59.000Z

177

Detonation limits in rough walled tubes  

Science Journals Connector (OSTI)

Abstract The present paper reports the results of a study of detonation limits in rough tubes. Detonation velocity is measured by photodiodes and ionization probes spaced at 10cm intervals along the length of the tube. Short lengths of smoked foils inserted into the core of the rough tube is used to register the structure of the detonation wave. Pressure transducers are also used to obtain the pressure profile. The results indicate that in rough tubes, the detonation velocity is generally much lower than the corresponding values for smooth tubes. The velocity decreases slowly at first and then more rapidly as the limit is approached. The velocity variation is generally continuous and at the limits, the failure velocity is of the order of about 0.4 V CJ for all cases. The detonation limits in rough tubes are found to be wider than for a smooth tube. This indicates that the turbulence generated by the wall roughness facilitates the propagation of the detonation and extends the limits. Smoked foil records show that in the core of the rough tube the detonation front has a cellular structure corresponding to the usual cellular structure due to instability of the detonation. Thus the intrinsic unstable cellular structure is quite robust and retains its global characteristics in spite of the large perturbations generated by the rough wall. The detonation in the core of the rough tube goes from multi-headed to single headed as the limit is approached. Past the single headed spin, the low velocity detonation has no cellular structure but consists of interacting weak transverse waves from the rough wall. The averaged pressure of the low velocity detonation front corresponds to about the constant volume explosion pressure, in accord with the velocity of the low velocity detonation.

Amanda Starr; John H.S. Lee; Hoi Dick Ng

2014-01-01T23:59:59.000Z

178

TUNING ROUGH CONTROLLERS BY GENETIC ALGORITHMS Teresa Chiu  

E-Print Network [OSTI]

rough sets, rough logic, and evolutionary computing. Rough logic government starts with a symbolic model]. It is a variant of classical fuzzy controller that integrates rough sets, fuzzy logic, genetic algorithm) at the front, we add rough set methodology to extract linguistic rules from a set of ``training data,'' (2

Lin, Tsau Young

179

Rough Truth, Consequence, Consistency and Belief Revision  

Science Journals Connector (OSTI)

The article aims at re-visiting the notion of rough truth...proposed by Pawlak in 1987 [11] and investigating some of its logical consequences. We focus on the formal deductive apparatus... ...

Mohua Banerjee

2004-01-01T23:59:59.000Z

180

Measuring the Surface Roughness of Stream Stones  

Science Journals Connector (OSTI)

Measuring the fine-scale heterogeneity of stones and other substrates is a challenge for benthic ecologists. I describe a method for measuring the roughness of stones that is based on the ratio of two surface ...

Elizabeth A. Bergey

2006-06-01T23:59:59.000Z

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.


181

Rough surface reconstruction for ultrasonic NDE simulation  

SciTech Connect (OSTI)

The reflection of ultrasound from rough surfaces is an important topic for the NDE of safety-critical components, such as pressure-containing components in power stations. The specular reflection from a rough surface of a defect is normally lower than it would be from a flat surface, so it is typical to apply a safety factor in order that justification cases for inspection planning are conservative. The study of the statistics of the rough surfaces that might be expected in candidate defects according to materials and loading, and the reflections from them, can be useful to develop arguments for realistic safety factors. This paper presents a study of real rough crack surfaces that are representative of the potential defects in pressure-containing power plant. Two-dimensional (area) values of the height of the roughness have been measured and their statistics analysed. Then a means to reconstruct model cases with similar statistics, so as to enable the creation of multiple realistic realizations of the surfaces, has been investigated, using random field theory. Rough surfaces are reconstructed, based on a real surface, and results for these two-dimensional descriptions of the original surface have been compared with those from the conventional model based on a one-dimensional correlation coefficient function. In addition, ultrasonic reflections from them are simulated using a finite element method.

Choi, Wonjae; Shi, Fan; Lowe, Michael J. S. [UK Research Centre in NDE, Imperial College, London SW7 2AZ (United Kingdom); Skelton, Elizabeth A.; Craster, Richard V. [Department of Mathematics, Imperial College, London SW7 2AZ (United Kingdom)

2014-02-18T23:59:59.000Z

182

Perturbative Roughness Corrections to Electromagnetic Casimir Energies  

E-Print Network [OSTI]

Perturbative corrections to the Casimir free energy due to macroscopic roughness of dielectric interfaces are obtained in the framework of an effective low-energy field theory. It describes the interaction of electromagnetic fields with materials whose plasma frequency $\\omega_p$ determines the low-energy scale. The na\\"ive perturbative expansion of the single-interface scattering matrix in the variance of the profile is sensitive to short wavelength components of the roughness correlation function. We introduce generalized counter terms that subtract and correct these high-momentum contributions to the loop expansion. To leading order the counter terms are determined by the phenomenological plasmon model. The latter is found to be consistent with the low-energy description. The proximity force approximation is recovered in the limit of long correlation length and gives the upper limit for the roughness correction to the Casimir force. The renormalized low-energy theory is insensitive to the high-momentum behavior of the roughness correlation function. Predictions of the improved theory are compared with those of the unrenormalized model and with experiment. The Casimir interaction of interfaces with low levels of roughness is found to be well reproduced by that of flat parallel plates with the measured reflection coefficients at a distance that is slightly less than the mean separation of the rough surfaces.

Hua Yao Wu; Martin Schaden

2014-02-11T23:59:59.000Z

183

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

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

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

184

Implementing algorithms of rough set theory and fuzzy rough set theory in the R package RoughSets  

Science Journals Connector (OSTI)

Abstract The package RoughSets, written mainly in the R language, provides implementations of methods from the rough set theory (RST) and fuzzy rough set theory (FRST) for data modeling and analysis. It considers not only fundamental concepts (e.g., indiscernibility relations, lower/upper approximations, etc.), but also their applications in many tasks: discretization, feature selection, instance selection, rule induction, and nearest neighbor-based classifiers. The package architecture and examples are presented in order to introduce it to researchers and practitioners. Researchers can build new models by defining custom functions as parameters, and practitioners are able to perform analysis and prediction of their data using available algorithms. Additionally, we provide a review and comparison of well-known software packages. Overall, our package should be considered as an alternative software library for analyzing data based on RST and FRST.

Lala Septem Riza; Andrzej Janusz; Christoph Bergmeir; Chris Cornelis; Francisco Herrera; Dominik ?lezak; Jos Manuel Bentez

2014-01-01T23:59:59.000Z

185

ROUGHNESS LENGTHS FOR THE SAVANNAH RIVER SITE  

SciTech Connect (OSTI)

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

186

Probabilistic Rough Set Approximations Yiyu (Y.Y.) Yao  

E-Print Network [OSTI]

Probabilistic Rough Set Approximations Yiyu (Y.Y.) Yao Department of Computer Science University have been applied to the theory of rough set in sev- eral forms, including decision-theoretic analysis and rough inclusion functions, we revisit probabilistic rough set approximation operators and present

Yao, Yiyu

187

Web-based Support Systems with Rough Set Analysis  

E-Print Network [OSTI]

Web-based Support Systems with Rough Set Analysis JingTao Yao Joseph P. Herbert Department. The applications of rough set analysis for WSS is looked at in this article. In particular, our focus of the challenges of using rough sets in a WMSS and detail some of the applications of rough sets in analyzing

Yao, JingTao

188

Fuzzy-Rough Nearest Neighbour Classification Richard Jensen1  

E-Print Network [OSTI]

as with the recently intro- duced vaguely quantified rough sets. Preliminary results are very good, and in general FRNN] and rough sets [18] is representative of this. The success of rough set theory is due in part to three on a particular domain. Thirdly, it finds a minimal knowledge representation for data. As rough set theory handles

Gent, Universiteit

189

Fuzzy-Rough Instance Selection Richard Jensen and Chris Cornelis  

E-Print Network [OSTI]

Fuzzy-Rough Instance Selection Richard Jensen and Chris Cornelis Abstract-- Rough set theory. Recently, the value of fuzzy-rough sets for feature selection and rule induction has been established proposes three novel methods for instance selection based on fuzzy-rough sets. The initial experimentation

Gent, Universiteit

190

Rough operations on Boolean algebras Guilin Qi and Weiru Liu  

E-Print Network [OSTI]

; Rough operations; Uncertainty measures 1 Introduction Rough set theory was introduced by Pawlak [16] to generalize the classical set theory. In rough set theory, given an equivalence relation on a universe, we can is corresponding to the equivalence relation [11]. In [14,15], Yao generalized rough set theory by generalizing

Liu, Weiru

191

Decision-theoretic rough fuzzy set model and application  

Science Journals Connector (OSTI)

Abstract This article investigates the rough approximation of a fuzzy concept on a probabilistic approximation space. We propose the probabilistic rough fuzzy set by defining the conditional probability of a fuzzy event. Then we establish the model of probabilistic rough fuzzy set and discuss several properties in detail. Furthermore, three generalizations of probabilistic rough fuzzy set, namely, 0.5-probabilistic rough fuzzy set, variable precision probabilistic rough fuzzy set and Bayesian rough fuzzy set are reported. In order to give a systematic method of selecting parameters for the probabilistic rough fuzzy set, we propose a decision-theoretic rough fuzzy set. That is, we formulate a non-parametric definition of the probabilistic rough fuzzy set. Moreover, we illustrate the motivation and verify the validity of the decision-theoretic rough fuzzy set by using a credit card applicant decision-making problem. Furthermore, the interrelationship between the decision-theoretic rough fuzzy set and the probabilistic rough fuzzy set is explained. The main contribution of this paper is twofold. One is to extend the probabilistic rough set to fuzzy environment, i.e., the probabilistic rough fuzzy set model. Another is to present an approach to select parameters needed in probabilistic rough fuzzy set modeling by using the process of decision-making under conditions of risk.

Bingzhen Sun; Weimin Ma; Haiyan Zhao

2014-01-01T23:59:59.000Z

192

Naive Bayesian Rough Sets Yiyu Yao and Bing Zhou  

E-Print Network [OSTI]

Naive Bayesian Rough Sets Yiyu Yao and Bing Zhou Department of Computer Science, University assumptions, which is often used for ranking or constructing a binary classifier. The theory of rough sets decision-theoretic rough set model, or simply a naive Bayesian rough set (NBRS) model, to integrate

Yao, Yiyu

193

Parameterizing energy conversion on rough topography  

E-Print Network [OSTI]

Parameterizing energy conversion on rough topography using bottom pressure sensors to measure form and mixing U0 Form drag pressure Tidal energy conversion Form drag causes: - internal wave generation - eddy Sound, WA Point Three Tree Previous work McCabe et al., 2006 > Measured the internal form drag

Warner, Sally

194

Loan payment prediction using rough sets  

Science Journals Connector (OSTI)

In small business loans, there is always a risk for nonpayment or non-refunding of loans though very detailed examinations are made about the company. In this study, behaviors that increase the risk in loans or causing non-refunding are tried to be determined ... Keywords: classification, loan payment failure, prediction, rough sets

Bahadtin Ruzgar; Nursel Selver Ruzgar

2008-03-01T23:59:59.000Z

195

Formal Concept Analysis Based on Rough Set Theory and a Construction Algorithm of Rough Concept Lattice  

Science Journals Connector (OSTI)

FCA(Formal Concept Analysis), which is accurate and complete in knowledge representation, is an effective tool for data analysis and knowledge discovery. A new lattice structure named RCL (Rough Concept Lattice) ...

Haifeng Yang

2011-01-01T23:59:59.000Z

196

Rough Mereological Reasoning in Rough Set Theory: Recent Results and Problems  

Science Journals Connector (OSTI)

This article comes up a couple of months after the death of Professor Zdzis?aw Pawlak who created in 1982 the theory of rough sets as a vehicle to carry out Concept...

Lech Polkowski

2006-01-01T23:59:59.000Z

197

Correlating toughness and roughness in ductile fracture  

E-Print Network [OSTI]

Three dimensional calculations of ductile crack growth under mode I plane strain, small scale yielding conditions are carried out using an elastic-viscoplastic constitutive relation for a progres- sively cavitating plastic solid with two populations of void nucleating second phase particles. Full field solutions are obtained for three dimensional material microstructures characterized by ran- dom distributions of void nucleating particles. Crack growth resistance curves and fracture surface roughness statistics are calculated using standard procedures. The range of void nucleating particle volume fractions considered give rise to values of toughness, JIC, that vary by a factor of four. For all volume fractions considered, the computed fracture surfaces are self-affine over a size range of about two orders of magnitude with a roughness exponent of 0.54 $\\pm$ 0.03. For small void nucleating particle volume fractions, the mean large particle spacing serves as a single dominant length scale. In this regime, the c...

Ponson, Laurent; Osovski, Shmulik; Bouchaud, Elisabeth; Tvergaard, Viggo; Needleman, Alan

2013-01-01T23:59:59.000Z

198

Smith-Purcell Radiation from Rough Surfaces  

E-Print Network [OSTI]

Radiation of a charged particle moving parallel to a inhomogeneous surface is considered. Within a single formalism periodic and random gratings are examined. For the periodically inhomogeneous surface we derive new expressions for the dispersion relation and the spectral-angular intensity. In particular, for a given observation direction two wavelengths are emitted instead of one wavelength of the standard Smith-Purcell effect. For a rough surface we show that the main contribution to the radiation intensity is given by surface polaritons induced on the interface between two media. These polaritons are multiply scattered on the roughness of surface and convert into real photons. The spectral-angular intensity is calculated and its dependence on different parameters is revealed.

Gevorkian, Zh S

2010-01-01T23:59:59.000Z

199

On multi-granulation covering rough sets  

Science Journals Connector (OSTI)

Abstract Recently, much attention has been given to multi-granulation rough sets (MGRS) and different kinds of multi-granulation rough set models have been developed from various viewpoints. In this paper, we propose four types of multi-granulation covering rough set (MGCRS) models under covering approximation space, where a target concept is approximated by employing the maximal or minimal descriptors of objects in a given universe of discourse U. And then, we investigate a number of basic properties of the four types of MGCRS models, and discuss the relationships and differences among the classical MGRS model and our MGCRS models. Moreover, the conditions for two distinct MGCRS models which produce identical lower and upper approximations of a target concept in a covering approximation space are also studied. Finally, the relationships among the four types of MGCRS models are explored. We find that for any subset X ? U , the lower approximations of X and the upper approximations of X under the four types of MGCRS models can construct a lattice, if we consider the binary relation of inclusion.

Caihui Liu; Duoqian Miao; Jin Qian

2014-01-01T23:59:59.000Z

200

Comparison of Wind-Models for Real Time Dispersion Simulation of Tracer Experiments Conducted Over Complex Terrain During Weak Flow Conditions  

Science Journals Connector (OSTI)

The radiological assessment during the early and intermediate phase of an accident, in case of radioactive emissions, is an important tool for emergency decision making. The development and evaluation of adequ...

Volker R. D. Herrnberger

1992-01-01T23:59:59.000Z

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.


201

The Landfall and Inland Penetration of a Flood-Producing Atmospheric River in Arizona. Part II: Sensitivity of Modeled Precipitation to Terrain Height and Atmospheric River Orientation  

Science Journals Connector (OSTI)

This manuscript documents numerical modeling experiments based on a January 2010 atmospheric river (AR) event that caused extreme precipitation in Arizona. The control experiment (CNTL), using the Weather Research and Forecasting (WRF) Model with ...

Mimi Hughes; Kelly M. Mahoney; Paul J. Neiman; Benjamin J. Moore; Michael Alexander; F. Martin Ralph

2014-10-01T23:59:59.000Z

202

MESOSCALENUMERICAL MODELING OF POLLUTANT TRANSPORT IN COMPLEX TERRAIN R. A. Pielke1j2, R..W. Arritt2, M. Segall, M. D. Moranl, and  

E-Print Network [OSTI]

-case impacts of power plant plumes on U.S. National Park lands in south Florida is presented based that synoptic baroclinicity, mesoscale thermal circulations, and boundary-layer turbulence can separately of the polluted air. Both a mathematical description and examples of numerical model simulations are used

Pielke, Roger A.

203

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

E-Print Network [OSTI]

.G. McGowan University of Massachusetts, Department of Mechanical & Industrial Engineering Renewable heights and strongly influences the cyclic loading on the turbine blades. For decades, academic and commercial researchers alike have worked on developing methods to obtain accurate wind shear profiles

Massachusetts at Amherst, University of

204

A popular technique for providing non line-of-sight cover-age in mountainous or urban terrain is high frequency  

E-Print Network [OSTI]

THE SOLAR MINIMUM Eric E. Johnson Klipsch School of Electrical and Computer Engineering New Mexico State operation, HF energy is directed vertically, and is refracted from the ionosphere to return nearly- tiveness of NVIS operation during a solar minimum. In this paper, we present measurements and analysis

Johnson, Eric E.

205

The Dispersion of Silver Iodide Particles from Ground-Based Generators over Complex Terrain. Part II: WRF Large-Eddy Simulations versus Observations  

Science Journals Connector (OSTI)

A numerical modeling study has been conducted to explore the ability of the Weather Research and Forecasting (WRF) model-based large-eddy simulation (LES) with 100-m grid spacing to reproduce silver iodide (AgI) particle dispersion by comparing ...

Lulin Xue; Xia Chu; Roy Rasmussen; Daniel Breed; Bruce Boe; Bart Geerts

2014-06-01T23:59:59.000Z

206

Assessment of the renewable groundwater resources of Wadi El-Arish, Sinai, Egypt, by using remote sensing, digital terrain elevation, and meteorological data  

SciTech Connect (OSTI)

The authors show that the most popular method to simulate Bose-Einstein (BE) interference effects predicts negligible correlations between identical pions originating from the hadronic decay of different W's produced in e{sup +}e{sup {minus}} {yields} W{sup +}W{sup {minus}} {yields} 4 jets at typical linear collider energies.

Gheith, H. M.; Sultan, M. I.

2000-01-24T23:59:59.000Z

207

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]

compressible numerical weather prediction model incompressible numerical weather prediction model withcompressible numerical weather prediction model in

Daniels, Megan Hanako

2010-01-01T23:59:59.000Z

208

A field study combined with modeling investigation demonstrates that the organization of transport by mountain terrain strongly affects the regional CO2  

E-Print Network [OSTI]

,b), and Moore et al. (2008) showed that 1) an aggrading Rocky Mountain subalpine forest is a net annual CO2 sink- A MULTISCALE AND MULTIDISCIPLINARY INVESTIGATION OF ECOSYSTEM­ATMOSPHERE CO2 EXCHANGE OVER THE ROCKY MOUNTAINS/sinks associated with plant distributions over heterogeneous surfaces, regardless of whether the surface is flat

209

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

Science Journals Connector (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

210

Decision-theoretic Rough Sets and Beyond Zdzislaw Pawlak introduced rough sets 30 years ago as a theory for data analysis and  

E-Print Network [OSTI]

Decision-theoretic Rough Sets and Beyond Zdzislaw Pawlak introduced rough sets 30 years ago as a theory for data analysis and classification. Rough. Fundamental notions of rough sets are knowledge granulation induced by grouping objects

Yao, JingTao

211

Research on Rough Set Theory and Applications in China  

Science Journals Connector (OSTI)

This article gives a capsule view of research on rough set theory and applications ongoing at universities and ... China. Included in this capsule view of rough set research is a brief description of the followin...

Guoyin Wang; Qinghua Zhang; Houkuan Huang; Dongyi Ye

2008-01-01T23:59:59.000Z

212

On the Climate Impact of Surface Roughness Anomalies  

Science Journals Connector (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

213

Diffuse scattering of hard x rays from rough surfaces  

Science Journals Connector (OSTI)

The diffuse scattering of hard x rays from rough solid surfaces has been measured and described quantitatively in terms of an improved distorted-wave Born approximation. The rough surface is characterized by the rms roughness ?, the height-height correlation length ?, and the roughness exponent h. The value for ? is in excellent agreement with that deduced from reflectivity. The significance of the parameters ?, ?, and h is tested by comparison with the results obtained from scanning force mircoscopy.

Wolfgang Weber and Bruno Lengeler

1992-09-15T23:59:59.000Z

214

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

E-Print Network [OSTI]

they are integrated and evolved. Rough set dependency rules are generated directly from the real valued attribute Terms--Soft computing, knowledge-based fuzzy networks, rough sets, genetic algorithms, pattern efficient systems in soft computing paradigm. Recently, the theory of rough sets [2], [3] has emerged

Mitra, Sushmita

215

ROUGH EVOLUTION EQUATIONS MASSIMILIANO GUBINELLI AND SAMY TINDEL  

E-Print Network [OSTI]

with respect to [12], and set the basis of a real rough path expansion in order to define and solve equation (2ROUGH EVOLUTION EQUATIONS MASSIMILIANO GUBINELLI AND SAMY TINDEL Abstract. We show how to generalize Lyons' rough paths theory in order to give a pathwise meaning to some non-linear infinite

Tindel, Samy - Institut de Mathématiques ?lie Cartan, Université Henri Poincaré

216

ROUGH SET APPROXIMATIONS: A CONCEPT ANALYSIS POINT OF VIEW  

E-Print Network [OSTI]

ROUGH SET APPROXIMATIONS: A CONCEPT ANALYSIS POINT OF VIEW Yiyu Yao University of Regina, Regina and content of data, definable concepts, lower and upper ap- proximations, rough set approximations Contents 1. Conclusion Bibliography Biographical Sketches Summary Rough set theory was proposed by Pawlak for analyzing

Yao, Yiyu

217

A study of the rough set for image understanding  

E-Print Network [OSTI]

A study of the rough set approach for image understanding by Peter Golibrzuch Supervisor: Prof. Dr . . . . . . . . . . . . . . . . . . . 8 2.4 Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3 Rough Sets 15 3.1 Classical Set Theory and Rough Sets . . . . . . . . . . . . . . 15 3.2 Information Systems

218

Rough Set Approximations in Formal Concept Analysis and Knowledge Spaces  

E-Print Network [OSTI]

Rough Set Approximations in Formal Concept Analysis and Knowledge Spaces Feifei Xu1,2 , Yiyu Yao2 a generalized definition of rough set approximations, based on a subsystem of subsets of a universe. The sub set approximations. 1 Introduction Rough set theory [6, 7] is an extension of the set theory with two

Yao, Yiyu

219

Probabilistic Approaches to Rough Sets Department of Computer Science  

E-Print Network [OSTI]

Probabilistic Approaches to Rough Sets Y.Y. Yao Department of Computer Science University of Regina reviews probabilistic approaches to rough sets in gran- ulation, approximation, and rule induction and probabilistic rough set approximations are studied. The probabilistic approximations are defined in a decision

Yao, Yiyu

220

Rough Sets and Matroids Victor W. Marek1  

E-Print Network [OSTI]

Rough Sets and Matroids Victor W. Marek1 and Andrzej Skowron2 1 Department of Computer Science and Zhu [2] and discuss some consequences of that and related facts for the development of rough set theory. Key words: rough set, matroid 1 Introduction The goal of this note is to provide a proof

Marek, Victor W.

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

Relational Interpretations of Neighborhood Operators Rough Set Approximation Operators  

E-Print Network [OSTI]

Relational Interpretations of Neighborhood Operators and Rough Set Approximation Operators Y.Y. Yao and rough set approximations using the more familiar notion of binary relations. A special class of neigh sets, partitions, coverings. 1 INTRODUCTION The theory of rough sets is motivated by practical needs

Yao, Yiyu

222

Generalized Rough Set Models Department of Computer Science  

E-Print Network [OSTI]

Generalized Rough Set Models Y.Y. Yao Department of Computer Science Lakehead University Thunder the rough set theory in early eighties, many proposals have been made for generalizing and interpreting rough sets [3, 4, 19, 27, 37, 38, 39, 46, 47, 51, 52, 54, 55, 63, 65, 66, 67, 68, 69, 70, 71, 72, 83, 92

Yao, Yiyu

223

Scattering by infinite one-dimensional rough surfaces  

Science Journals Connector (OSTI)

...wave scattering by infinite rough surfaces and interfaces (see...but only if we assume that the rough surface approaches a flat boundary...plane-wave incidence), if our rough surface is periodic and the...we denote by BC(V ) the set of functions bounded and continuous...

1999-01-01T23:59:59.000Z

224

Attribute Reduction in Decision-Theoretic Rough Set Models  

E-Print Network [OSTI]

Attribute Reduction in Decision-Theoretic Rough Set Models Yiyu Yao, Yan Zhao Department of Computer Science, University of Regina, Regina, Saskatchewan, Canada S4S 0A2 Abstract Rough set theory can, and interpreted by, a decision-theoretic model, which is a probabilistic extension of the Pawlak rough set model

Yao, Yiyu

225

Spinning rough disc moving in a rarefied medium  

Science Journals Connector (OSTI)

...body under consideration is a rough disc, that is, a set obtained from a circle by...Triangular cavity. The sets B m representing the rough disc B are regular m-gons...2009 bBilliard scattering on rough sets:two-dimensional caseSIAM...

2010-01-01T23:59:59.000Z

226

ROUGH VOLTERRA EQUATIONS 1: THE ALGEBRAIC INTEGRATION SETTING.  

E-Print Network [OSTI]

ROUGH VOLTERRA EQUATIONS 1: THE ALGEBRAIC INTEGRATION SETTING. AUR?LIEN DEYA AND SAMY TINDEL of the rough path theory called algebraic integration. In the Young case, that is for a driving signal with Volterra equations driven by rough paths. For an arbitrary positive constant T, this kind of equation can

Tindel, Samy - Institut de Mathématiques ?lie Cartan, Université Henri Poincaré

227

ROUGH VOLTERRA EQUATIONS 1: THE ALGEBRAIC INTEGRATION SETTING  

E-Print Network [OSTI]

ROUGH VOLTERRA EQUATIONS 1: THE ALGEBRAIC INTEGRATION SETTING AUR´ELIEN DEYA AND SAMY TINDEL of the rough path theory called algebraic integration. In the Young case, that is for a driving signal with H equations driven by rough paths. For an arbitrary positive constant T, this kind of equation can be written

Paris-Sud XI, Université de

228

A New Approach to Fuzzy-Rough Nearest Neighbour Classification  

E-Print Network [OSTI]

-norm), as well as with the recently introduced vaguely quantified rough sets. Preliminary results are very good- gredients of rough set theory, i.e., lower and upper approximation. In this paper, therefore, we present, including the traditional implicator/t-norm based model [13], as well as the vaguely quantified rough set

Gent, Universiteit

229

Rough Set Approximation Framework for Smarter Vertical Handovers  

E-Print Network [OSTI]

2010 Rough Set Approximation Framework for Smarter Vertical Handovers Nalin ChakooO, Saewoong to support seamless mobility. In this paper, we propose rough set based decision framework for vertical handoff in heterogeneous networks. We apply fuzzy decision to fuzzy-rough set which gives us the advantage

Bahk, Saewoong

230

Learning Optimal Parameters in Decision-Theoretic Rough Sets  

E-Print Network [OSTI]

Learning Optimal Parameters in Decision-Theoretic Rough Sets Joseph P. Herbert JingTao Yao]@cs.uregina.ca Abstract. A game-theoretic approach for learning optimal parameter values for probabilistic rough set. The decision-theoretic rough set model acquires initial values for these parameters through a combination

Yao, JingTao

231

ROUGH VOLTERRA EQUATIONS 1: THE ALGEBRAIC INTEGRATION SETTING.  

E-Print Network [OSTI]

ROUGH VOLTERRA EQUATIONS 1: THE ALGEBRAIC INTEGRATION SETTING. AUR?LIEN DEYA AND SAMY TINDEL, the main dierence between classical dierential equations driven by rough signals and our Volterra setting of the rough path theory called algebraic integration. In the Young case, that is for a driving signal

Deya, Aurélien - Institut de Mathématiques ?lie Cartan, Université Henri Poincaré

232

An Incremental, Probabilistic Rough Set Approach to Rule Discovery  

E-Print Network [OSTI]

1 An Incremental, Probabilistic Rough Set Approach to Rule Discovery Ning Zhong, Ju­Zhen Dong, Setsuo Ohsuga, Tsau Young Lin Abstract--- This paper introduces an incremental, proba­ bilistic rough set. The approach is based on the combination of Generaliza­ tion Distribution Table (GDT) and the rough set

Lin, Tsau Young

233

Fuzzy Rough Sets: from Theory into Practice Chris Cornelis1  

E-Print Network [OSTI]

Fuzzy Rough Sets: from Theory into Practice Chris Cornelis1 , Martine De Cock1 , Anna Maria 1, 00-661 Warsaw, Poland annrad@mini.pw.edu.pl Abstract Fuzzy sets and rough sets address two], 1965), as well as the slightly younger rough sets (Pawlak [23], 1982), have left an important mark

Gent, Universiteit

234

Bounds on the electrical resistance between contacting elastic rough bodies  

Science Journals Connector (OSTI)

...conductance for the rough contact problem...be restricted to a set of microscopic `actual...comprises an in nite set of highly clustered...of indentation of a rough surface. These bounds...Consequences for fractal rough surfaces The bounds...comprises an in nite set of point contacts...

2003-01-01T23:59:59.000Z

235

Generalization of Rough Sets Using Relationships Between Attribute Values  

E-Print Network [OSTI]

Generalization of Rough Sets Using Relationships Between Attribute Values Y.Y. Yao Department2 E-mail: wong@cs.uregina.ca abstract The notion of rough sets is generalized by using an arbitrary attribute values. The adoption of other types of relations enables us to define various classes of rough set

Yao, Yiyu

236

Using Rough Sets Theory to predict German Word Stress  

E-Print Network [OSTI]

Using Rough Sets Theory to predict German Word Stress Stefan Rapp Michael Jessen Grzegorz Dogil 14 Rough Set Theory [Paw82, Paw91] is a framework for reasonably deal­ ing with imprecise or uncertain data application of a Rough Set based machine learning algorithm is presented that can predict german word stress

Reyle, Uwe

237

Fuzzy Rough Positive Region based Nearest Neighbour Classification  

E-Print Network [OSTI]

, Wales, UK Email: rkj@aber.ac.uk Abstract--This paper proposes a classifier that uses fuzzy rough set fuzzy rough set theory to improve the FNN algorithm have some shortcomings and we overcome them by using vaguely quantified rough sets (VQRSs, [7]). In this paper, we show that FRNN only takes into account one

Gent, Universiteit

238

Multi-Adjoint Fuzzy Rough Sets Chris Cornelisa,1  

E-Print Network [OSTI]

Multi-Adjoint Fuzzy Rough Sets Chris Cornelisa,1 , Jes´us Medinab,2 , Nele Verbiesta a Department/t-norm based fuzzy rough set model based on a family of adjoint pairs. Rather than using a fixed implicator use in data reduction. 1. Introduction Fuzzy sets and rough sets model two complementary

Gent, Universiteit

239

Uncertainty measures of rough set prediction Ivo Dntsch  

E-Print Network [OSTI]

Uncertainty measures of rough set prediction Ivo Düntsch School of Information and Software in rough set data analysis, the approximation quality, is of limited value when there is a choice of competing models for predicting a decision variable. In keeping within the rough set philosophy of non

Düntsch, Ivo

240

Statistical Evaluation of Rough Set Dependency Analysis Ivo Dntsch1  

E-Print Network [OSTI]

Statistical Evaluation of Rough Set Dependency Analysis Ivo Düntsch1 School of Information authorship implied #12;Summary Rough set data analysis (RSDA) has recently become a frequently studied databases; it is, however, not clear from within the methods of rough set analysis, whether the extracted

Düntsch, Ivo

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 Sets, Kernel Set, and Spatiotemporal Outlier Detection  

E-Print Network [OSTI]

Rough Sets, Kernel Set, and Spatiotemporal Outlier Detection Alessia Albanese, Member, IEEE, Sankar with the outlier detection problem in spatiotemporal data and describe a rough set approach that finds the top outliers in an unlabeled spatiotemporal data set. The proposed method, called Rough Outlier Set Extraction

Pal, Sankar Kumar

242

Case Generation Using Rough Sets with Fuzzy Representation  

E-Print Network [OSTI]

Case Generation Using Rough Sets with Fuzzy Representation Sankar K. Pal, Fellow, IEEE, and Pabitra a fuzzy granulation of the feature space. Rough set theory is used to obtain dependency rules which model-life data sets. Index Terms--Case-based reasoning, linguistic representation, rough dependency rules

Mitra, Pabitra

243

Theory of free surface flow over rough seeping beds  

Science Journals Connector (OSTI)

...horizontal bed is assumed to be rough consisting of sediment...the other hand, in the rough flow regime (Re *70...the introduction, the set of equations (3.2...turbulent flow over a rough planar sand bed. The...The flow conditions were set in such a way that sediment...

2007-01-01T23:59:59.000Z

244

Constructive and Algebraic Methods of the Theory of Rough Sets  

E-Print Network [OSTI]

Constructive and Algebraic Methods of the Theory of Rough Sets Y.Y. Yao Department of Computer@flash.lakeheadu.ca This paper reviews and compares constructive and algebraic approaches in the study of rough sets operators using the binary relation. Different classes of rough set algebras are obtained from different

Yao, Yiyu

245

Surface roughness of anodized titanium coatings.  

SciTech Connect (OSTI)

Samples of grade five 6Al4V titanium alloy were coated with two commercial fluoropolymer anodizations (Tiodize and Canadize) and compared. Neither coating demonstrates significant outgassing. The coatings show very similar elemental analysis, except for the presence of lead in the Canadize coating, which may account for its lower surface friction in humid environments. Surface roughness has been compared by SEM, contact profilometry, optical profilometry, power spectral density and bidirectional scattering distribution function (BSDF). The Tiodize film is slightly smoother by all measurement methods, but the Canadize film shows slightly less scatter at all angles of incidence. Both films exhibited initial friction coefficients of 0.2 to 0.4, increasing to 0.4 to 0.8 after 1000 cycles of sliding due to wear of the coating and ball. The coatings are very similar and should behave identically in most applications.

Dugger, Michael Thomas; Chinn, Douglas Alan

2010-10-01T23:59:59.000Z

246

Steady and Unsteady Wind Loading of Buildings and Structures [and Discussion  

Science Journals Connector (OSTI)

...terrain are briefly discussed. For design based on steady wind loadings the design wind speed is dependent on the acceptable degree of risk. Force and pressure coefficients may be influenced by Reynolds number, surface roughness, wind characteristics...

1971-01-01T23:59:59.000Z

247

A minimal axiom group for rough set based on quasi-ordering  

Science Journals Connector (OSTI)

Rough set axiomatization is one aspect of rough set study to characterize rough set theory using dependable and minimal axiom groups. Thus, rough set theory can be studied by logic and axiom system methods. The c...

Jian-hua Dai; Wei-dong Chen; Yun-he Pan

2004-07-01T23:59:59.000Z

248

Improving the Scalability of Reduct Determination in Rough Sets.  

E-Print Network [OSTI]

??Rough Set Data Analysis (RSDA) is a non-invasive data analysis approach that solely relies on the data to find patterns and decision rules. Despite its (more)

Mahmood, Shahid

2013-01-01T23:59:59.000Z

249

Algebraic approach to dependency of knowledge on rough set  

Science Journals Connector (OSTI)

The explosion of knowledge crops up embarrassing situations for the human beings to advance the research work in respect of comprehending uncertainty. A number of critical studies by the researchers had developed new theories and models in the past decades about roughness and fuzziness of the objects. Rough set and intuitionistic fuzzy set are some advancing theories which help the quest of dealing with vagueness and uncertainty. The present paper aims at drawing rough set and intuitionistic fuzzy sets together for establishing a new concept of rough intuitionistic fuzzy set in algebraic method where core and dependency of knowledge has been re-conceptualised for a boarder perspective.

Debadutta Mohanty

2012-01-01T23:59:59.000Z

250

Effects of Atomic Scale Roughness at Metal/insulator Interfaces...  

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

Work Function. Effects of Atomic Scale Roughness at Metalinsulator Interfaces on Metal Work Function. Abstract: We evaluate the performance of different van der Waals (vdW)...

251

Rough surface mitigates electron and gas emission  

SciTech Connect (OSTI)

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

252

Counterintuitive MCNPX Results for Scintillator Surface Roughness Effect  

SciTech Connect (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

253

Integrating rough set and genetic algorithm for negative rule extraction  

Science Journals Connector (OSTI)

Rule extraction is an important issue in data mining field. In this paper, we study the extraction problem for the complete negative rules of the form R ? D. By integrating rough set theory and genetic algorithm, we propose ... Keywords: genetic algorithm, negative rule, rough sets, rule extraction

Junyu Liu; Yubao Liu; Yan Long

2009-09-01T23:59:59.000Z

254

Discovering Concurrent Process Models in Data: A Rough Set Approach  

Science Journals Connector (OSTI)

The aim of the lecture is to provide a survey of state of the art related to a research direction concerning relationships between rough set theory and concurrency in the context of process mining in data. The main goal of this review is the general ... Keywords: Knowledge discovery, Petri nets, concurrent systems, data mining, process mining, rough sets

Zbigniew Suraj

2009-12-01T23:59:59.000Z

255

Measurement of normal contact stiffness of fractal rough surfaces  

E-Print Network [OSTI]

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

Chongpu Zhai; Sbastien Bevand; Yixiang Gan; Dorian Hanaor; Gwnalle Proust; Bruno Guelorget; Delphine Retraint

2014-08-26T23:59:59.000Z

256

Transport Theory for Shallow Water Propagation with Rough Boundaries  

SciTech Connect (OSTI)

At frequencies of about 1 kHz and higher, forward scattering from a rough sea surface (and/or a rough bottom) can strongly affect shallow water propagation and reverberation. The need exists for a fast, yet accurate method for modeling such propagation where multiple forward scattering occurs. A transport theory method based on mode coupling is described that yields the first and second moments of the field. This approach shows promise for accurately treating multiple forward scattering in one-way propagation. The method is presently formulated in two space dimensions, and Monte-Carlo rough surface PE simulations are used for assessing the accuracy of transport theory results.

Thorsos, Eric I.; Henyey, Frank S.; Elam, W. T.; Hefner, Brian T.; Reynolds, Stephen A.; Yang Jie [Applied Physics Laboratory, University of Washington, 1013 NE 40th Street, Seattle, WA 98105 (United States)

2010-09-06T23:59:59.000Z

257

2012 IEEE International Conference on Granular Computing Generalized Infinitive Rough Sets Based on  

E-Print Network [OSTI]

2012 IEEE International Conference on Granular Computing Generalized Infinitive Rough Sets Based propose equivalent form of lower and upper approximations in binary relational rough set model in ways variable precision rough set model to variable precision binary relational rough set model. Index Terms-rough

Lin, Tsau Young

258

Dark spot formation relative to ITO surface roughness for polyfluorene  

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

259

Hypersonic Measurements of Roughness-Induced Transient Growth  

E-Print Network [OSTI]

The effects of surface roughness on boundary-layer disturbance growth and laminar-to-turbulent transition are not well understood, especially in hypersonic boundary layers. The transient growth mechanism that produces algebraic growth of stream wise...

Sharp, Nicole Susanne

2014-04-17T23:59:59.000Z

260

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

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

Ice friction: The effects of surface roughness, structure, and hydrophobicity  

SciTech Connect (OSTI)

The effect of surface roughness, structure, and hydrophobicity on ice friction is studied systematically over a wide range of temperature and sliding speeds using several metallic interfaces. Hydrophobicity in combination with controlled roughness at the nanoscale is achieved by femtosecond laser irradiation to mimic the lotus effect on the slider's surface. The controlled roughness significantly increases the coefficient of friction at low sliding speeds and temperatures well below the ice melting point. However, at temperatures close to the melting point and relatively higher speeds, roughness and hydrophobicity significantly decrease ice friction. This decrease in friction is mainly due to the suppression of capillary bridges in spite of the presence of surface asperities that facilitate their formation. Finally, grooves oriented in the sliding direction also significantly decrease friction in the low velocity range compared to scratches and grooves randomly distributed over a surface.

Kietzig, Anne-Marie; Hatzikiriakos, Savvas G.; Englezos, Peter [Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, British Columbia V6T 1Z3 (Canada)

2009-07-15T23:59:59.000Z

262

Hardware Accelerator Design Based on Rough Set Philosophy  

Science Journals Connector (OSTI)

This paper presents a design of hardware accelerator for algorithms of rough set theory. A hardware implementation of incremental reduct ... becomes more visible when dealing with larger data sets.

K. S. Tiwari; A. G. Kothari

2014-01-01T23:59:59.000Z

263

Discovering Concurrent Process Models in Data: A Rough Set Approach  

Science Journals Connector (OSTI)

The aim of the lecture is to provide a survey of state of the art related to a research direction concerning relationships between rough set theory and concurrency in the context of process mining in data. The...

Zbigniew Suraj

2009-01-01T23:59:59.000Z

264

PROPAGATION OF SINGULARITIES FOR ROUGH METRICS HART F. SMITH  

E-Print Network [OSTI]

PROPAGATION OF SINGULARITIES FOR ROUGH METRICS HART F. SMITH Abstract. We use a wave packet the Simons Foundation (# 266371 to Hart Smith). 1 #12;2 HART F. SMITH H¨ormander's theorem [9] on propagation

Smith, Hart F.

265

Effect of Surface Roughness on Wind Turbine Performance  

E-Print Network [OSTI]

Wind farm operators observe production deficits as machines age. Quantifying deterioration on individual components is difficult, but one potential explanation is accumulation of blade surface roughness. Historically, wind turbine airfoils were...

Ehrmann, Robert Schaefer

2014-06-25T23:59:59.000Z

266

Effect of surface roughness and adsorbates on superlubricity  

E-Print Network [OSTI]

We study the sliding of elastic solids in adhesive contact with flat and rough interfaces. We consider the dependence of the sliding friction on the elastic modulus of the solids. For elastically hard solids with planar surfaces with incommensurate surface structures we observe extremely low friction (superlubricity), which very abruptly increases as the elastic modulus decreases. We show that even a relatively small surface roughness or a low concentration of adsorbates may completely kill the superlubricity state.

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

2006-07-12T23:59:59.000Z

267

Dominance-Based Rough Set Approach as a Proper Way of Handling Graduality in Rough Set Theory  

Science Journals Connector (OSTI)

Referring to some ideas of Leibniz, Frege, Boole and ?ukasie-wicz, we represent fundamental concepts of rough set theory in terms of a generalization that ... permits to deal with the graduality of fuzzy sets. Ou...

Salvatore Greco; Benedetto Matarazzo; Roman S?owi?ski

2007-01-01T23:59:59.000Z

268

On Asymptotic Properties of Rough Set Theoretic Approximations. Fractal Dimension, Exact Sets, and Rough Inclusion in Potentially Infinite Information Systems  

Science Journals Connector (OSTI)

We look at asymptotic properties of rough set approximations exploiting them to three-fold purpose ... , to define the notion of an exact set in infinite information system to the result that so defined exact sets

Lech Polkowski

2002-01-01T23:59:59.000Z

269

Game-theoretic rough sets for recommender systems  

Science Journals Connector (OSTI)

Abstract Recommender systems guide their users in decisions related to personal tastes and choices. The rough set theory can be considered as a useful tool for predicting recommendations in recommender systems. We examine two properties of recommendations with rough sets. The first property refers to accuracy or appropriateness of recommendations and the second property highlights the generality or coverage of recommendations. Making highly accurate recommendations for majority of the users is a major hindrance in achieving high quality performance for recommender systems. In the probabilistic rough set models, these two properties are controlled by thresholds ( ? , ? ) . One of the research issues is to determine effective values of these thresholds based on the two considered properties. We apply the game-theoretic rough set (GTRS) model to obtain suitable values of these thresholds by implementing a game for determining a trade-off and balanced solution between accuracy and generality. Experimental results on movielen dataset suggest that the GTRS improves the two properties of recommendations leading to better overall performance compared to the Pawlak rough set model.

Nouman Azam; JingTao Yao

2014-01-01T23:59:59.000Z

270

An improved attribute reduction scheme with covering based rough sets  

Science Journals Connector (OSTI)

Abstract Attribute reduction is viewed as an important preprocessing step for pattern recognition and data mining. Most of researches are focused on attribute reduction by using rough sets. Recently, Tsang et al. discussed attribute reduction with covering rough sets in the paper (Tsang et al., 2008), where an approach based on discernibility matrix was presented to compute all attribute reducts. In this paper, we provide a new method for constructing simpler discernibility matrix with covering based rough sets, and improve some characterizations of attribute reduction provided by Tsang et al. It is proved that the improved discernibility matrix is equivalent to the old one, but the computational complexity of discernibility matrix is relatively reduced. Then we further study attribute reduction in decision tables based on a different strategy of identifying objects. Finally, the proposed reduction method is compared with some existing feature selection methods by numerical experiments and the experimental results show that the proposed reduction method is efficient and effective.

Changzhong Wang; Mingwen Shao; Baiqing Sun; Qinghua Hu

2015-01-01T23:59:59.000Z

271

Generalisation of rough set for rule induction in incomplete system  

Science Journals Connector (OSTI)

Rough set models based on the tolerance and similarity relations, have been widely used to deal with incomplete information systems. However, tolerance and similarity relations have their own limitations because the former is too loose while the latter is too strict in classification analysis. To make a reasonable and flexible classification in incomplete information system, a new binary relation is proposed in this paper. Such binary relation is only reflexive and it is a generalisation of tolerance and similarity relations. Furthermore, rough set models based on the above three different binary relations are compared. Finally, the direct approach to rules induction is investigated by using the proposed rough set, some illustrative examples are analysed to substantiate the conceptual arguments.

Xibei Yang; Xiaoning Song; Xiaohua Hu

2011-01-01T23:59:59.000Z

272

Inhomogeneous Cooling of the Rough Granular Gas in Two Dimensions  

E-Print Network [OSTI]

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

Sudhir N. Pathak; Dibyendu Das; R. Rajesh

2014-07-03T23:59:59.000Z

273

Determination of interfacial roughness using X-ray scattering  

SciTech Connect (OSTI)

Crystal truncation rod (CTR) scattering is shown to be a powerful technique for determining interfacial roughness non-destructively. By measuring the decay of scattering away from a Bragg reflection in the surface direction an rms roughness of the surface or interface can be extracted. The authors obtain rms roughness values with an accuracy of {+-} 0.1 {angstrom}. Sensitivity to lateral length scale roughness ranges from the wavelength of the x-rays to between 1,000--10,000 {angstrom} depending on the instrument function and the specific truncation rod. The influence of different cleans, as well as the thermal oxidation process, on the Si-SiO{sub 2} interface is investigated. A hot water treatment prior to the thermal oxidation is shown to roughen the Si-SiO{sub 2} interface. CTR scattering results also show a smoothing of the interface as a result of the oxidation process even for as little as 60 {angstrom} of thermal oxidation. Comparison between AFM and CTR scattering gives a consistent picture of the relative roughness of the wafers, although the absolute numbers do not agree. The differences in the absolute values can be explained by the lateral roughness scale that the two techniques measure, indicating that it is at periodicities below {approx} 100 {angstrom} that the increased roughness observed by the x-ray is found. Crystal truncation rods are shown to be perpendicular to the surface and not along the crystallographic axes of a miscut crystal. It is shown that for a crystal terminated by a regular step array both an atomistic and a continuum description of CTR scattering give identical results. Furthermore, the atomistic approach is used to show that a diamond cubic surface with a miscut is inherently rough. Even for a small miscut the tilt of the CTR with respect to the crystallographic axes results in complications for measuring the rod intensity. The authors present schemes for determining the exact position of the CTR in reciprocal space and for measuring the miscut of a single crystal. These methods were applied to the measurement of CTR intensities of silicon(001) wafers with miscuts of 0.1 and 4 degrees.

Munkholm, A.

1997-05-01T23:59:59.000Z

274

Development of SolGel Icephobic Coatings: Effect of Surface Roughness and Surface Energy  

Science Journals Connector (OSTI)

Development of SolGel Icephobic Coatings: Effect of Surface Roughness and Surface Energy ... Energy

Qitao Fu; Xinghua Wu; Divya Kumar; Jeffrey W. C. Ho; Pushkar D. Kanhere; Narasimalu Srikanth; Erjia Liu; Peter Wilson; Zhong Chen

2014-11-10T23:59:59.000Z

275

Duality, Conjugacy and Adjointness of Approximation Operators in Covering Based Rough Sets  

E-Print Network [OSTI]

Duality, Conjugacy and Adjointness of Approximation Operators in Covering Based Rough Sets Mauricio approximation operators in covering-based rough sets. In this paper, we establish relationships between the most for the generalized rough set model based on a binary relation. Key words: rough sets, coverings, approximations

Granada, Universidad de

276

Effective boundary condition at a rough surface starting from a slip condition.  

E-Print Network [OSTI]

, set in a channel with a rough boundary, of small amplitude and wavelength . It was shown recently thatEffective boundary condition at a rough surface starting from a slip condition. Anne, for any non-degenerate roughness pattern, and for any reasonable condition imposed at the rough boundary

Gerard-Varet, David - Institut de Mathématiques de Jussieu, Université Paris 7

277

Granular computing, rough entropy and object extraction Sankar K. Pal a,1  

E-Print Network [OSTI]

of image object extraction in the framework of rough sets and granular computing is addressed. A mea- sure of rough entropy are described. ? 2005 Elsevier B.V. All rights reserved. Keywords: Rough sets; Entropy in the process of prob- lem solving. Recently, rough set theory (Pawlak, 1991) has become a popular mathematical

Mitra, Pabitra

278

Algebra and Geometry of Rough Logic Controllers T. Y. Lin 1 tylin@cs.susu.edu  

E-Print Network [OSTI]

for intelligent controls, is a mathematical formalism that integrates fuzzy logic, rough sets , evolutionary: control, fuzzy logic, evolutionary computing, modal logic, rough logic, rough set. 1 IntroductionAlgebra and Geometry of Rough Logic Controllers T. Y. Lin 1 tylin@cs.susu.edu Martin Wildberger 2

Lin, Tsau Young

279

On Generalizing Rough Set Theory Department of Computer Science, University of Regina  

E-Print Network [OSTI]

On Generalizing Rough Set Theory Y.Y. Yao Department of Computer Science, University of Regina formulations of the standard rough set theory. It demonstrates how those formulations can be adopted to develop different generalized rough set theories. The relationships be- tween rough set theory and other theories

Yao, Yiyu

280

Characterization of neighborhood operators for covering based rough sets, using duality and  

E-Print Network [OSTI]

Characterization of neighborhood operators for covering based rough sets, using duality@ugr.es Abstract Covering based Rough Sets are an important general- ization of Rough Set Theory. Basically for these approximation operators. Keywords: rough sets, coverings, approximations, neighborhood operator, order relation

Granada, Universidad de

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
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281

Semantics of Fuzzy Sets in Rough Set Theory Department of Computer Science  

E-Print Network [OSTI]

Semantics of Fuzzy Sets in Rough Set Theory Y.Y. Yao Department of Computer Science University of rough sets. Rough membership func- tions are viewed as a special type of fuzzy membership functions and rough membership functions, between core and support of fuzzy set theory and lower and upper

Yao, Yiyu

282

Improved global bathymetry, global sea floor roughness, and deep ocean mixing  

E-Print Network [OSTI]

ocean and the increased mixing over rough topography by proposing that tidal dissipation was a power

Becker, Joseph Jeffrey

2008-01-01T23:59:59.000Z

283

Improved Global Bathymetry, Global Sea Floor Roughness, and Deep Ocean Mixing  

E-Print Network [OSTI]

ocean and the increased mixing over rough topography by proposing that tidal dissipation was a power

Becker, Joseph J

2008-01-01T23:59:59.000Z

284

First Order Rough LogicRevisited T.Y. Lin 1;2 and Qing Liu 3  

E-Print Network [OSTI]

on axiomatic rough set theory, first order rough logic was developed earlier. In this paper, a new model theory and rough set theory. Rough set theory is based on a known equivalence relation (indis­ cernibility relation equivalence relation. How­ ever, to see clearly the relationships between rough logic and rough set theories

Lin, Tsau Young

285

Title: Aerodynamic and Scalar Roughness over Snow and Sea Ice In Monin-Obukhov similarity theory, the aerodynamic roughness, z0, is the artificial height  

E-Print Network [OSTI]

Title: Aerodynamic and Scalar Roughness over Snow and Sea Ice Abstract: In Monin-Obukhov similarity theory, the aerodynamic roughness, z0, is the artificial height above the surface at which the wind speed the theory and measurement of the aerodynamic and scalar roughness lengths over snow and sea ice. The data

286

Fluid squeeze-out between solids with rough surfaces  

E-Print Network [OSTI]

We study the fluid squeeze-out from the interface between an elastic solid with a flat surface and a rigid solid with a randomly rough surface. As an application we discuss fluid squeeze-out between a tire tread block and a road surface. Some implications for the leakage of seals are discussed, and experimental data are presented to test the theory.

B. Lorenz; B. N. J. Persson

2010-04-07T23:59:59.000Z

287

Multilayer roughness and image formation in the Schwarzschild objective  

SciTech Connect (OSTI)

We present a study of the effect of multilayer-surface-roughness-induced scattering in the image formation of the Schwarzschild objective (SO) used in the spectromicroscope MAXIMUM. The two mirrors comprising the SO are coated with Ru/B{sub 4}C multilayers that have a peak reflectivity at 130 eV. We had long observed that a diffuse x-ray background surrounds the focused x-ray spot. The spatial resolution remains at 0.1 {mu}m in spite of this. However, since a significant fraction of the flux is lost to the background, since too large an area of the sample is illuminated, and since the S/N ratio is degraded, the origins of this effect merit investigation. This diffuse background resulting from x-ray scattering at the surface of the mirrors was mapped out using bidirectional knife edge scans. Complementary surface roughness simulations were carried out with the ray-tracing program SHADOW. AFM experiments were also done to directly measure the surface roughness and power spectrum of representative multilayers. Following curve fitting, it was possible to classify Gaussian components in both the measured and simulated profiles as arising from scattering occurring at either the convex primary mirror or the concave secondary mirror. Together with geometrical analysis, these techniques permitted us to track the image formation process of an actual optical system in the presence of surface roughness. {copyright} {ital 1996 American Institute of Physics.}

Singh, S.; Solak, H.; Cerrina, F. [University of Wisconsin, 3731 Schneider Drive, Stoughton, WI 53589 (United States)] [University of Wisconsin, 3731 Schneider Drive, Stoughton, WI 53589 (United States)

1996-09-01T23:59:59.000Z

288

Neutron scattering by rough surfaces at grazing incidence  

Science Journals Connector (OSTI)

There are a number of calculations in the literature of the effect of statistical surface roughness on the specular and diffuse scattering of neutrons and x rays which impinge on surfaces at grazing incidence. These calculations do not agree with one another and in some cases lack internal consistency. In this paper I show that these discrepancies can be resolved within the distorted-wave Born approximation. The result I obtain for the specular reflectivity is the widely used version of Nevot and Croce, while that for the diffuse scattering is the same as a recent calculation by Sinha, Sirota, Garoff, and Stanley. The approximations made by Nevot and Croce are clearly revealed by the distorted-wave Born approximation. A simple numerical algorithm is proposed for the calculation of diffuse scattering from a surface whose roughness is self-affine, and the form of the scattering is calculated for a range of parameters within this model. The calculation of diffusion scattering is extended in this paper to the case of films with rough surfaces. Correlation between roughness at the two film surfaces is considered and shown to be important for the description of neutron reflectivity data obtained with a thin film of titanium deposited on a sapphire substrate.

Roger Pynn

1992-01-01T23:59:59.000Z

289

Reduce redundant broadcasting in MANETs using rough sets  

Science Journals Connector (OSTI)

A Mobile Ad-Hoc Network (MANET) consists of wireless hosts which may move often. The movement of hosts results in frequent changes in paths. In these cases, finding a path from source to destination becomes difficult. The well-known Ad-hoc On-Demand Distance Vector Routing (AODV) and Dynamic Source Routing (DSR) are routing protocols which are in vogue to determine a route when no route exists or a route breaks. As such to establish a new path from source to destination, it broadcasts control packets (route request packets), which increase the network bandwidth consumption. As MANETs have limited bandwidth, it is essential to reduce the control packets. We propose mathematical models which use the concept of rough set and Weighted Rough Set (WRS) to minimise the route request packets in the existing AODV and DSR routing protocols. Rough set theory is a mathematical tool to deal with vagueness, uncertainty; and WRS theory is an extension to rough set theory which also considers the importance of the objects.

A. Nagaraju; S. Ramachandram

2014-01-01T23:59:59.000Z

290

Graph and matrix approaches to rough sets through matroids  

Science Journals Connector (OSTI)

Abstract Rough sets are efficient for attribute reduction and rule extraction in data mining. However, many important problems including attribute reduction in rough sets are NP-hard, therefore the algorithms to solve them are often greedy. Matroids, generalized from linear independence in vector spaces, provide well-established platforms for greedy algorithm design. In this paper, we use graph and matrix approaches to study rough sets through matroids. First, we construct an isomorphism from equivalence relations to 2-circuit matroids, and then propose graph representations of lower and upper approximations through the graphic matroid. We also study graph representations of lower and upper approximations by that of the dual of the matroid. Second, in light of the fact that the relational matrix is a representable matrix of the matroid induced by an equivalence relation, matrix representations of lower and upper approximations are obtained with the representable matrix of the matroid. In a word, borrowing from matroids, this work presents two interesting views, graph and matrix ones, to investigate rough sets.

Shiping Wang; Qingxin Zhu; William Zhu; Fan Min

2014-01-01T23:59:59.000Z

291

Mask roughness induced LER: geometric model at long correlation lengths  

SciTech Connect (OSTI)

Collective understanding of how both the resist and line-edge roughness (LER) on the mask affect the final printed LER has made significant advances. What is poorly understood, however, is the extent to which mask surface roughness couples to image plane LER as a function of illumination conditions, NA, and defocus. Recently, progress has been made in formulating a simplified solution for mask roughness induced LER. Here, we investigate the LER behavior at long correlation lengths of surface roughness on the mask. We find that for correlation lengths greater than 3/NA in wafer dimensions and CDs greater than approximately 0.75/NA, the previously described simplified model, which remains based on physical optics, converges to a 'geometric regime' which is based on ray optics and is independent of partial coherence. In this 'geometric regime', the LER is proportional to the mask slope error as it propagates through focus, and provides a faster alternative to calculating LER in contrast to either full 2D aerial image simulation modeling or the newly proposed physical optics model. Data is presented for both an NA = 0.32 and an NA = 0.5 imaging system for CDs of 22-nm and 50-nm horizontal-line-dense structures.

McClinton, Brittany M.; Naulleau, Patrick P.

2011-02-11T23:59:59.000Z

292

Multilayer roughness and image formation in the Schwarzschild objective  

Science Journals Connector (OSTI)

We present a study of the effect of multilayer?surface?roughness?induced scattering in the image formation of the Schwarzschild objective (SO) used in the spectromicroscope MAXIMUM. The two mirrors comprising the SO are coated with Ru/B4C multilayers that have a peak reflectivity at 130 eV. We had long observed that a diffuse x?ray background surrounds the focused x?ray spot. The spatial resolution remains at 0.1 ?m in spite of this. However since a significant fraction of the flux is lost to the background since too large an area of the sample is illuminated and since the S/N ratio is degraded the origins of this effect merit investigation. This diffuse background resulting from x?ray scattering at the surface of the mirrors was mapped out using bidirectional knife edge scans. Complementary surface roughness simulations were carried out with the ray?tracing program SHADOW. AFM experiments were also done to directly measure the surface roughness and power spectrum of representative multilayers. Following curve fitting it was possible to classify Gaussian components in both the measured and simulated profiles as arising from scattering occurring at either the convex primary mirror or the concave secondary mirror. Together with geometrical analysis these techniques permitted us to track the image formation process of an actual optical system in the presence of surface roughness.

S. Singh; H. Solak; F. Cerrina

1996-01-01T23:59:59.000Z

293

Studies of the 3D surface roughness height  

SciTech Connect (OSTI)

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

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

2013-12-16T23:59:59.000Z

294

On the union and intersection operations of rough sets based on various approximation spaces  

Science Journals Connector (OSTI)

Abstract Algebraic structures and lattice structures of rough sets are basic and important topics in rough sets theory. In this paper we pointed out that a basic problem had been overlooked, that is the closeness of union and intersection operations of rough approximation pairs, i.e. (lower approximation, upper approximation). We present that the union and intersection operations of rough approximation pairs are closed for classical rough sets and two kinds of covering based rough sets, but not for twenty kinds of covering based rough sets and the generalized rough sets based on fuzzy approximation space. Moreover, we proved that the union and intersection operations of rough fuzzy approximation pairs are closed and a bounded distributive lattice can be constructed.

Xiaohong Zhang; Jianhua Dai; Yucai Yu

2015-01-01T23:59:59.000Z

295

Impact of Ice Crystal Roughness on Satellite Retrieved Cloud Properties  

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

296

A modified electrospark alloying method for low surface roughness  

Science Journals Connector (OSTI)

A modified electrospark alloying method has been developed. The method allows the formation of deposits with low surface roughness compared to that of the conventional electrospark alloying method. It is based on the employment of a sequence of identical pulse groups. The process of electrospark deposition and the process of electrospark grinding were combined by forming pulse groups consisting of a high energy pulse for mass transfer from treating electrode to substrate and low energy pulses for grinding during deposition. Low as-deposited surface roughness was succeeded by properly selecting parameters of the pulses in a group and pauses between them. Experimental results revealed that the proposed method is useful in forming onetwo layers of deposition.

Alexander V. Ribalko; Orhan Sahin; Kemal Korkmaz

2009-01-01T23:59:59.000Z

297

Investigating memetic algorithm in solving rough set attribute reduction  

Science Journals Connector (OSTI)

Attribute reduction is the problem of selecting a minimal subset from the original set of attributes. Rough set theory has been used for attribute reduction with much success. Since it is well known that finding a minimal subset is a NP-hard problem; therefore, it is necessary to develop efficient algorithms to solve this problem. In this work, we propose a memetic algorithm-based approach inside the rough set theory which is a hybridisation of genetic algorithm and simulated annealing. The proposed method has been tested on UCI data sets. Experimental results demonstrate the effectiveness of this memetic approach when compared with previous available methods. Possible extensions upon this simple approach are also discussed.

Majdi Mafarja; Salwani Abdullah

2013-01-01T23:59:59.000Z

298

Distributed Roughness Receptivity in a Flat Plate Boundary Layer  

E-Print Network [OSTI]

- Distributed Receptivity . . . . . 6 2. FACILITY DESCRIPTION - THE KLEBANOFFSARIC WIND TUNNEL 11 2.1 Test Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.2 Fan and Motor... of this dissertation describes the KlebanoffSaric Wind Tunnel facility, which was used for this experiment. Section 3 describes the experimental setup (roughness design and the flat plate model) and defines the metrics by which the flow field is decomposed...

Kuester, Matthew Scott

2014-04-18T23:59:59.000Z

299

Capillary adhesion between elastic solids with randomly rough surfaces  

E-Print Network [OSTI]

I study how the contact area and the work of adhesion, between two elastic solids with randomly rough surfaces, depend on the relative humidity. The surfaces are assumed to be hydrophilic, and capillary bridges form at the interface between the solids. For elastically hard solids with relative smooth surfaces, the area of real contact and therefore also the sliding friction, are maximal when there is just enough liquid to fill out the interfacial space between the solids, which typically occurs for $d_{\\rm K} \\approx 3 h_{\\rm rms}$, where $d_{\\rm K}$ is the height of the capillary bridge and $h_{\\rm rms}$ the root-mean-square roughness of the (combined) surface roughness profile. For elastically soft solids, the area of real contact is maximal for very low humidity (i.e., small $d_{\\rm K}$), where the capillary bridges are able to pull the solids into nearly complete contact. In both case, the work of adhesion is maximal (and equal to $2\\gamma {\\rm cos}\\theta$, where $\\gamma$ is the liquid surface tension and $\\theta$ the liquid-solid contact angle) when $d_{\\rm K} >> h_{\\rm rms}$, corresponding to high relative humidity.

B. N. J. Persson

2008-05-06T23:59:59.000Z

300

Rough-fuzzy Classifier Modeling Using Data Repository Sets  

Science Journals Connector (OSTI)

Abstract This paper reflects the trends of the past years based on the diffusion of various traditional approaches and methods when tackling new problems. Two components of the computational intelligence (CI) are applied, rough and fuzzy sets theory. These components permit one to operate with uncertainty data. The current knowledge in the investigated field is summarized and briefly explained. It also deals with uncertainty in an information system and the two approaches, the fuzzy sets (FSs) and rough sets theory (RST), for operating it. The proposal and implementation of a rough-fuzzy classifier (RFC) is modified. RFC uses the rules generated by RSTbox. The databases IRIS and WINE were chosen for verification. The classification results were compared with the results of other classification methods are applied on these databases. Finally, we summarized the presented problems. Based on the above stated facts it can be claimed that the proposed modified algorithm, \\{RSTbox\\} and RFC model are functional. The model is relatively successful (compared to other approaches), and by using it two classification databases can be carried out. This model is proposed in MATLAB.

Jiri Krupka; Pavel Jirava

2014-01-01T23:59:59.000Z

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.


301

Interpretation of equilibria in game-theoretic rough sets  

Science Journals Connector (OSTI)

Abstract Intelligent decision making models aim at improving the quality of decision making under uncertainty. The fundamental issues that are generally encountered in these models are too many options to choose from and the involvement of contradictory decision making criteria. The game-theoretic rough set (GTRS) model provides an intelligent decision making mechanism that exploits a game-theoretic environment for analyzing strategic situations between cooperative or conflicting decision making criteria in the probabilistic rough set framework. The concept of equilibria is of central importance in the GTRS model which has not been sufficiently addressed in the current literature. Two key issues in this regard are the interpretation of equilibria and the establishment of their existence. By reviewing, examining and defining the basic game constructs in the GTRS model, we are able to interpret an equilibrium in terms of the decision thresholds that control the rough sets based decision regions. In particular, an equilibrium is defined in terms of a pair of thresholds such that no player has a unilateral incentive to change these thresholds within the game. An example game is considered to demonstrate the use of the interpretation in determining the thresholds. The issue of existence of equilibria is addressed by considering a couple of typical two-player games in the GTRS model. The results suggest that the existence of equilibria may be established under certain limited conditions.

Nouman Azam; JingTao Yao

2015-01-01T23:59:59.000Z

302

Dimensional variation and roughness of LIGA fabricated microstructures  

SciTech Connect (OSTI)

We have measured the dimensional variation and sidewall roughness of features on PMMA micro- components fabricated by deep x-ray lithography in order to assess the effect of dimensional variation on subsequent assembly operations. Dimensional measurements were made using a stylus profilometer with a repeatability in step height of better than 0.01 {mu}m. Roughness measurements were made with the same profilometer scanning in a direction perpendicular to the length of the parts. 22 {mu}m and 54 {mu}m features exhibited dimensional variations described by a Gaussian distribution with standard deviations of 0.202 {mu}m and 0.381 {mu}m, respectively. This corresponds to a maximum relative variation of between 0.6% and 0.9%. Sidewall roughnesses were found to be in the range of 0.02 {mu}m to 0. 03 {mu}m, an insignificant contribution to the total variation when compared to overall dimensional variation. Several potential sources of this variation are discussed, but no single cause was identified as the source of the significant dimensional variation observed here.

Egert, C.M. [Oak Ridge National Lab., TN (United States); Wood, R. [Microelectronics Center of North Carolina, Research Triangle Park, NC (United States); Malek, C.K. [Louisiana State Univ., Baton Rouge, LA (United States)

1996-10-01T23:59:59.000Z

303

Rough Fuzzy Set Model for Set-Valued Ordered Fuzzy Decision System  

Science Journals Connector (OSTI)

The classical rough set theory can not be directly used to reduce knowledge in set-valued ordered fuzzy decision system. Firstly, we propose a dominance relation-based rough fuzzy set model in set-valued ordered ...

Zhongkui Bao; Shanlin Yang; Ju Zhao

2014-01-01T23:59:59.000Z

304

Data Mining in Uniform Hospital Discharge Data Set Using Rough Set Model  

Science Journals Connector (OSTI)

Purpose: The purpose of this study were to apply rough set model to nursing knowledge discovery process. Method: Data mining based on rough set model was conducted on a large clinical data set containing Nursing ...

M. Park

2013-01-01T23:59:59.000Z

305

Using Variable Precision Rough Set Model to Build FP-Tree of Association Rules  

Science Journals Connector (OSTI)

The main mission of the variable precision rough set is to solve the problem of non- ... of association rules algorithms based on variable precision rough set model in e-commerce. The experiments show...

SuJuan Qian; ZhiQiang Zhang

2012-01-01T23:59:59.000Z

306

E-Print Network 3.0 - angle deposited nano-rough Sample Search...  

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

nano-rough Search Powered by Explorit Topic List Advanced Search Sample search results for: angle deposited nano-rough Page: << < 1 2 3 4 5 > >> 1 Advanced techniques for glancing...

307

Fundamenta Informaticae 108(3-4), 2011, pp. 267286 267 Game-Theoretic Rough Sets  

E-Print Network [OSTI]

Fundamenta Informaticae 108(3-4), 2011, pp. 267­286 267 IOS Press Game-Theoretic Rough Sets Joseph@cs.uregina.ca Abstract. This article investigates the Game-theoretic Rough Set (GTRS) model and its capability of analyzing a major decision problem evident in existing probabilistic rough set models. A major challenge

Yao, JingTao

308

Space Exploration and Global Optimization for Computationally Intensive Design Problems: A Rough Set Based Approach  

E-Print Network [OSTI]

, and transparent. This work proposes a rough set based approach that can identify multip,le sub-regions in a design than a given level. The rough set method is applied iteratively on a growing sample set. A novel with a few well-known global optimization algorithms. Keywords: rough set, design optimization, space

Wang, Gaofeng Gary

309

Game-Theoretic Risk Analysis in Decision-Theoretic Rough Sets  

E-Print Network [OSTI]

Game-Theoretic Risk Analysis in Decision-Theoretic Rough Sets Joseph P. Herbert JingTao Yao,jtyao]@cs.uregina.ca Abstract. Determining the correct threshold values for probabilistic rough set models has been a heated these tolerance values. 1 Introduction In rough sets [10], a set within the universe of discourse is approximated

Yao, JingTao

310

From Rough Sets to Soft Computing Department of Mathematics and Computer Science, San Jose State University,  

E-Print Network [OSTI]

From Rough Sets to Soft Computing T.Y. Lin Department of Mathematics and Computer Science, San Jose By the invitation of the Conference Chair Professor Paul Wang, a Workshop on Rough Set Theory was held in the Second­October 1, 1995. The workshop in the setting of joint conferences provides a forum for rough setters

Lin, Tsau Young

311

Prediction of Dominant Genes Responsible for Lung Adenocarcinoma using Rough Set Theory  

E-Print Network [OSTI]

Prediction of Dominant Genes Responsible for Lung Adenocarcinoma using Rough Set Theory Abhinandan responsible for Lung Adenocarcinoma using Rough Set Theory. The work takes a microarray dataset containing and attributes. Using rough set theory, redundant attributes are then determined and eliminated. The core

Gesbert, David

312

Implicator-Conjunctor Based Models of Fuzzy Rough Sets: Definitions and Properties  

E-Print Network [OSTI]

Implicator-Conjunctor Based Models of Fuzzy Rough Sets: Definitions and Properties Lynn D'eer1 those proposals which generalize the logical connectives and quantifiers present in the rough set, rough sets, hybridization, lower and upper ap- proximation, implication, conjunction, axiomatic approach

Granada, Universidad de

313

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

E-Print Network [OSTI]

Introduction to the Special Issue on Rough Sets and Soft Computing. T. Y. Lin Department, California 94720 . The notion of rough sets was introduced by Zdzislaw Pawlak in his seminal paper of 1982 of information systems. From the outset, rough set theory has been a methodology of database mining or knowledge

Lin, Tsau Young

314

FRPS: A Fuzzy Rough Prototype Selection method Nele Verbiest a,n  

E-Print Network [OSTI]

: Classification Fuzzy rough sets Instance selection k NN Prototype Selection a b s t r a c t The k Nearest with a reduced but reinforced dataset to pick its neighbours from. We use fuzzy rough set theory to express are instance selection methods specifically designed to improve k NN classification. Rough set theory [6

Gent, Universiteit

315

Relations in Mathematical Morphology with applications to Graphs and Rough Sets  

E-Print Network [OSTI]

Relations in Mathematical Morphology with applications to Graphs and Rough Sets John G. Stell School of Computing, University of Leeds Leeds, LS2 9JT, U.K. jgs@comp.leeds.ac.uk Abstract. Rough sets for granularity, and the question of how rough sets relate to mathe- matical morphology has been raised by Bloch

Stell, John

316

Comparison of Rough-set and Interval-set Models for Uncertain Reasoning  

E-Print Network [OSTI]

Comparison of Rough-set and Interval-set Models for Uncertain Reasoning Y.Y. Yao and Xining Li Department of Computer Science Lakehead University Thunder Bay, Ontario, Canada P7B 5E1 Abstract In the rough-set of their extended set-theoretic operators. The operators in the rough-set model are not truth-functional, while

Yao, Yiyu

317

Fundamenta Informaticae 108 (2011) 249265 249 Two Semantic Issues in a Probabilistic Rough Set Model  

E-Print Network [OSTI]

Rough Set Model Yiyu Yao Department of Computer Science University of Regina Regina, Canada yyao@cs.uregina.ca Abstract. Probabilistic rough set models are quantitative generalizations of the classical and qual in a probabilistic rough set model. This paper examines two fundamental semantics-related questions. One

Yao, Yiyu

318

Rough Set Model Selection for Practical Decision Making Joseph P. Herbert JingTao Yao  

E-Print Network [OSTI]

Rough Set Model Selection for Practical Decision Making Joseph P. Herbert JingTao Yao Department}@cs.uregina.ca Abstract One of the challenges a decision maker faces is choos- ing a suitable rough set model to use for data analysis. The traditional algebraic rough set model classifies objects into three regions, namely

Yao, JingTao

319

Personalizing information retrieval in CRISs with Fuzzy Sets and Rough Sets  

E-Print Network [OSTI]

Personalizing information retrieval in CRISs with Fuzzy Sets and Rough Sets Germán Hurtado Martín? Our approach proposes using fuzzy and rough sets to make the matching process between the users. Furthermore, both fuzzy and rough sets perform well in the presence of imperfect or missing information

Gent, Universiteit

320

Rough Sets for Uncertainty Reasoning S.K.M. Wong1  

E-Print Network [OSTI]

Rough Sets for Uncertainty Reasoning S.K.M. Wong1 and C.J. Butz2 1 Department of Computer Science & Engineering, University of Ottawa, Ottawa, Canada, K1N 6N5, butz@site.uottawa.ca Abstract. Rough sets have traditionally been applied to decision (clas- sification) problems. We suggest that rough sets are even better

Butz, Cory J.

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

Fundamenta Informaticae XX (2004) 118 1 A New Rough Sets Model Based on Database Systems  

E-Print Network [OSTI]

Fundamenta Informaticae XX (2004) 1­18 1 IOS Press A New Rough Sets Model Based on Database Systems, USA jhan@csudh.edu Abstract. Rough sets theory was proposed by Pawlak in the 1980s and has been applied success- fully in a lot of domains. One of the major limitations of the traditional rough sets

Lin, Tsau Young

322

Concept Lattices in Rough Set Theory Department of Computer Science, University of Regina  

E-Print Network [OSTI]

Concept Lattices in Rough Set Theory Y.Y. Yao Department of Computer Science, University of Regina-- An alternative formulation of rough set theory can be developed based on a binary relation between two universes, one is a finite set of objects and the other is a finite set of properties. Rough set approximation

Yao, Yiyu

323

Fundamenta Informaticae 34 (1999) 1{21 1 Contributions to the Theory of Rough Sets  

E-Print Network [OSTI]

Fundamenta Informaticae 34 (1999) 1{21 1 IOS Press Contributions to the Theory of Rough Sets V, KY 40506{0046 marek|mirek@cs.uky.edu Abstract. We study properties of rough sets, that is system. A rough set is a pair hL; U i such that L; U are de nable in the information system and L U

Truszczynski, Miroslaw

324

A Comparative Study of Formal Concept Analysis and Rough Set Theory in Data Analysis  

E-Print Network [OSTI]

A Comparative Study of Formal Concept Analysis and Rough Set Theory in Data Analysis Yiyu (Y@cs.uregina.ca; http://www.cs.uregina.ca/yyao Abstract. The theory of rough sets and formal concept analysis. Formal concept analysis focuses on concepts that are definable by conjuctions of properties, rough set

Yao, Yiyu

325

Neurocomputing 36 (2001) 1}3 Presenting the special issue on Rough-neuro computing  

E-Print Network [OSTI]

, adaptation, and self-organization on the other. Granular computing including rough sets and fuzzy sets of neural networks and granular computing, in particular rough sets and fuzzy sets. There are 10 papers a way of integrating rough set theory with a fuzzy MLP using a modular evolutionary algorithm

Pal, Sankar Kumar

326

Improving SMOTE with Fuzzy Rough Prototype Selection to detect Noise in Imbalanced  

E-Print Network [OSTI]

). Using fuzzy rough set theory, the noise level of each instance is measured, and instances for which Rough Set The- ory 1 Introduction Imbalanced classification has become an important field in data mining on fuzzy rough set theory [7]. Next, we remove all instances that have a noise

Gent, Universiteit

327

Ablation of carbon-based materials : investigation of roughness set-up from  

E-Print Network [OSTI]

Ablation of carbon-based materials : investigation of roughness set-up from heterogeneous reactions for roughness set-up is investigated, based on the coupling between diffusive transfer in the sur- rounding and heat transfers, the importance of which relies on the surface roughness. A new possible physical cause

Paris-Sud XI, Université de

328

Generalization of Rough Sets using Modal Logics Department of Computer Science, Lakehead University  

E-Print Network [OSTI]

Generalization of Rough Sets using Modal Logics Y.Y. Yao Department of Computer Science, Lakehead@cs.sjsu.edu Abstract The theory of rough sets is an extension of set theory with two addi­ tional unary set operators in modal logics. By explor­ ing the relationship between rough sets and modal logics, this paper

Lin, Tsau Young

329

Information Granulation and Approximation in a Decision-theoretic Model of Rough Sets  

E-Print Network [OSTI]

Information Granulation and Approximation in a Decision-theoretic Model of Rough Sets Y.Y. Yao in the gran- ulated universe are two related fundamental issues in the theory of rough sets. Many proposals of results from existing studies that are relevant to a decision-theoretic modeling of rough sets. Two

Yao, Yiyu

330

A Comparative Study of Fuzzy Sets and Rough Sets Department of Computer Science, Lakehead University  

E-Print Network [OSTI]

A Comparative Study of Fuzzy Sets and Rough Sets Y.Y. Yao 1 Department of Computer Science and compares theories of fuzzy sets and rough sets. Two approaches for the formulation of fuzzy sets are reviewed, one is based on many-valued logic and the other is based on modal logic. Two views of rough sets

Yao, Yiyu

331

Fundamenta Informaticae 34 (1999) 1--21 1 Contributions to the Theory of Rough Sets  

E-Print Network [OSTI]

Fundamenta Informaticae 34 (1999) 1--21 1 IOS Press Contributions to the Theory of Rough Sets V Lexington, KY 40506--0046 marek---mirek@cs.uky.edu Abstract. We study properties of rough sets, that is system. A rough set is a pair hL; Ui such that L; U are definable in the information system and L ` U

Truszczynski, Miroslaw

332

Two Views of the Theory of Rough Sets in Finite Universes  

E-Print Network [OSTI]

Two Views of the Theory of Rough Sets in Finite Universes Y.Y. Yao 1 Department of Computer Science This paper presents and compares two views of the theory of rough sets. The operator-oriented view interprets rough set theory as an extension of set theory with two additional unary operators. Under such a view

Yao, Yiyu

333

Fuzzy Rough Set Based Web Query Expansion Martine De Cock and Chris Cornelis  

E-Print Network [OSTI]

Fuzzy Rough Set Based Web Query Expansion Martine De Cock and Chris Cornelis Fuzziness, Krijgslaan 281 (S9), 9000 Gent, Belgium {Martine.DeCock, Chris.Cornelis}@UGent.be Abstract Fuzzy rough set on average -- we focus on query ex- pansion, i.e. the process of adding related terms to the query. Rough set

Gent, Universiteit

334

Fuzzy Rough Sets: Beyond the Obvious Martine De Cock, Chris Cornelis, Etienne Kerre  

E-Print Network [OSTI]

Fuzzy Rough Sets: Beyond the Obvious Martine De Cock, Chris Cornelis, Etienne Kerre Fuzziness.Kerre@UGent.be Abstract-- Rough set theory was introduced in 1982. Soon it was combined with fuzzy set theory, giving rise. I. INTRODUCTION Pawlak [12] launched rough set theory as a framework for the construction

Gent, Universiteit

335

Incorporating Game-theoretic Rough Sets in Web-based Medical Decision Support Systems  

E-Print Network [OSTI]

Incorporating Game-theoretic Rough Sets in Web-based Medical Decision Support Systems JingTao Yao of game-theoretic rough set (GTRS) component in WMDSS is explored and investigated for this purpose. The GTRS is a recent development in rough sets that takes advantages from data analysis capabilities

Yao, JingTao

336

A Rough Sets Based Approach to Feature Selection M. Zhang J. T. Yao  

E-Print Network [OSTI]

A Rough Sets Based Approach to Feature Selection M. Zhang J. T. Yao Department of Computer Science. The features are measured by their necessity in heuristic feature selection techniques. Rough set theory has been used to define the necessity of features in literature. We propose a new rough set based feature

Yao, JingTao

337

Decision-Theoretic Rough Set Models Department of Computer Science, University of Regina,  

E-Print Network [OSTI]

Decision-Theoretic Rough Set Models Yiyu Yao Department of Computer Science, University of Regina, Regina, Saskatchewan, Canada S4S 0A2 E-mail: yyao@cs.uregina.ca Abstract. Decision-theoretic rough set models are a probabilistic exten- sion of the algebraic rough set model. The required parameters

Yao, Yiyu

338

Interval-valued Fuzzy-Rough Feature Selection and Application for Handling Missing Values in Datasets  

E-Print Network [OSTI]

, UK {rkj,qqs}@aber.ac.uk Abstract One of the many successful applications of rough set theory has been to the area of feature selection. The rough set ideol- ogy of using only the supplied data and no other information has many benefits, where most other methods require sup- plementary knowledge. Fuzzy-rough set

Lucas, Simon M.

339

The effect of roughness on aerosol deposition in tubes  

E-Print Network [OSTI]

is the Reynolds number. The data formed a peculiar dip at a Reynolds number between 2000 and 10, 000 (depending on roughness) and remained fairly constant for increased Reynolds number. Nikuradse concluded that when the thickness of the laminar layer is greater...). The experiments of Wirtz and Chen (1991) were conducted on internally transverse finned (ribbed) tubes for a Reynolds number range of 2000 - 8000 and various rib spacings (3 - 18 mm) and heights (12 - 18 mm), using air as the fluid media. Their experimental...

Chavez, Mario Cesar

2012-06-07T23:59:59.000Z

340

Scaling laws governing the roughness of the swash edge line  

E-Print Network [OSTI]

The physics of swash i.e. a layer of water that washes up on the beach after an incoming wave has broken is complicated and intriguing. It includes perplexed hydrodynamic and sediment transport events. In our paper we address to the roughness of the moving swash boundary at which a beach, water and air meet. We treat the behavior of this boundary as an interfacial phenomenon, without going into details of formation of edge waves and beach cusps, covered broadly in literature. This "crude" approach turns out to be productive and revealing the resemblance of the swash line with a broad diversity of effects arising from the random pinning of moving boundaries.

Ed. Bormashenko; A. Musin; R. Grynuov

2014-02-23T23:59:59.000Z

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

On the relation between rough set reducts and typical testors  

Science Journals Connector (OSTI)

Abstract This paper studies the relations between rough set reducts and typical testors from the so-called logical combinatorial approach to pattern recognition. Definitions, comments and observations are formally introduced and supported by illustrative examples. Furthermore, some theorems expressing theoretical relations between reducts and typical testors are enunciated and proved. We also discuss several practical applications of these relations that can mutually enrich the development of research and applications in both areas. Although we focus on the relation between the classical concepts of testor and reduct, our study can be expanded to include other types of testors and reducts.

Manuel S. Lazo-Corts; Jos Fco. Martnez-Trinidad; Jess A. Carrasco-Ochoa; Guillermo Sanchez-Diaz

2015-01-01T23:59:59.000Z

342

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

343

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

344

Rough set approach to the evaluation of stormwater pollution  

Science Journals Connector (OSTI)

This paper addresses the problem of urban stormwater quality and its impacts on the receiving water. In order to describe this phenomenon, research aimed at creating a mathematical model of pollution has been conducted. Although various deterministic and stochastic models exist already, the quality of stormwater phenomenon deserves a very careful and thoughtful validation. In order to take advantage of some empirical observations available, we introduce an inductive learning method to discover some regularities in form of ''if...then...'' rules. We suggest the use of the rough set theory for this purpose. This approach is able to process both quantitative and qualitative data and also accepts inconsistency in the dataset. The rules generated from the data explain the phenomenon in terms of relevant attributes, and can be used to predict the level of pollution from future events. We present the results of the rough set analysis of a dataset concerning five catchments in the urban area of Lausanne and Geneva, Switzerland. The application of the rules to events from other catchments, particularly in France, proves the good prediction ability of our model.

Luca Rossi; Roman Slowinski; Robert Susmaga

1999-01-01T23:59:59.000Z

345

Rough set-based regionalisation in air quality monitoring  

Science Journals Connector (OSTI)

Regionalisation is to organise a large set of spatial objects into spatially contiguous regions despite optimising the homogeneity of the derived regions, while representing social and economic geography. To confront this problem, it is necessary to classify the regions to form groups that are homogeneous in air quality attributes. It is to develop a system that applies data mining techniques to study the distribution of air pollutants in Chennai, a metro city in India using vehicular ad hoc networking and map the distribution on the geographical map for effective policy making. In conventional regionalisation methods, the data points are assigned to a single region in a multidimensional attribute space affecting air pollution response. However, some data points, having distributed membership to more than one region, could not be justified and allocated to a single region. Rough set-based clustering technique is applied to regionalisation problem to resolve vague or overlapping regions. The overlapping regions are restructured to guarantee the homogeneity of the regions formed or altered. The investigations of the cluster validity tests confirm the effectiveness of rough set-based regionalisation in air quality modelling.

Komathy Karuppanan; Christina Jayakumaran

2013-01-01T23:59:59.000Z

346

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 Journals Connector (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

347

The effects of the substrate surface roughness on graphene plasmons  

SciTech Connect (OSTI)

We investigate the effects of variation in the gap size between mono-layer graphene and a substrate with a randomly rough surface on the linear response of graphenes ? electron bands within the approximation of Dirac fermions. We adopt the electrostatic Greens function developed by Rahman and Maradudin [Phys. Rev. B 21, 21372143 (1980)] for the surface of a dielectric medium, which exhibits a Gaussian distributed height profile and combine it with the polarization function of graphene described as a zero-thickness planar layer at a fixed distance from the mean position of the substrate surface. We specifically consider the effects of a random gap size on the two-dimensional sheet plasmon mode in heavily doped graphene, both on its dispersion relation in the long-wavelength limit and its broadening due to Landau damping in the continuum of inter-band electron-hole excitations at shorter wavelengths.

Lyon, Keenan A.; Miskovic, Zoran L. [Department of Applied Mathematics, University of Waterloo, 200 University Ave W, N2L 3G1, Waterloo, Ontario (Canada)

2014-03-31T23:59:59.000Z

348

Scaling relations for contour lines of rough surfaces  

Science Journals Connector (OSTI)

Equilibrium and nonequilibrium growth phenomena, e.g., surface growth, generically yields self-affine distributions. Analysis of statistical properties of these distributions appears essential in understanding statistical mechanics of underlying phenomena. Here, we analyze scaling properties of the cumulative distribution of iso-height loops (i.e., contour lines) of rough self-affine surfaces in terms of loop area and system size. Inspired by the Coulomb gas methods, we find the generating function of the area of the loops. Interestingly, we find that, after sorting loops with respect to their perimeters, Zipf-like scaling relations hold for ranked loops. Numerical simulations are also provided in order to demonstrate the proposed scaling relations.

M. A. Rajabpour and S. M. Vaez Allaei

2009-07-13T23:59:59.000Z

349

Forward approximation and backward approximation in fuzzy rough sets  

Science Journals Connector (OSTI)

Abstract It is general to obtain rules by attribute reduction in fuzzy information systems. Instead of obtaining rules by attribute reduction, which may have a negative effect on inducting good rules, the objective of this paper is to extract rules without computing attribute reducts. Forward and backward approximations in fuzzy rough sets are first defined, and their important properties are discussed. Two algorithms based on forward and backward approximations, namely, mine rules based on the forward approximation (MRBFA) and mine rules based on the backward approximation (MRBBA), are proposed for rule extraction. The two algorithms are evaluated by several data sets from the UC Irvine Machine Learning Repository. The experimental results show that both MRBFA and MRBBA achieve better classification performances than the method based on attribute reduction.

Yi Cheng

2015-01-01T23:59:59.000Z

350

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

SciTech Connect (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

351

Rough Approximations under Level Fuzzy Sets W.-N. Liu J.T. Yao Y.Y.Yao  

E-Print Network [OSTI]

Rough Approximations under Level Fuzzy Sets W.-N. Liu J.T. Yao Y.Y.Yao Department of Computer]@cs.uregina.ca Abstract. The combination of fuzzy set and rough set theories lead to various models. Functional and set- mations based on the notion of level fuzzy sets. Two rough approximation models, namely -level rough set

Yao, JingTao

352

2012 IEEE International Conference on Granular Computing Granular and Rough Computing on Covering  

E-Print Network [OSTI]

@gmail.comxiejun@tyut.edu.cn San Jose, CA, USA tylin@cs.sjsu.edu Abstract-Covering-based rough set (CRS) is a meaningful and important generalization of Pawlak's rough set theory. The primary goal of this paper is to extend-covering-based rough set; the globaV2nd GrC Model; neighborhood system; best upper and lower approxi mations; largest

Lin, Tsau Young

353

Scattering of optical guided waves by waveguide surface roughness: a three-dimensional treatment  

Science Journals Connector (OSTI)

The scattering of optical guided waves by waveguide surface roughness has been analyzed in three dimensions. The scattered fields were determined by satisfying the boundary conditions...

Hall, D G

1981-01-01T23:59:59.000Z

354

Procedure of evaluating the surface roughness of the electrospark coating after burnishing with mineral ceramics  

Science Journals Connector (OSTI)

The procedure of evaluating the surface roughness of metal-cutting tools strengthened by the local electrospark deposition of coatings with the subsequent burnishing with...

V. N. Gadalov; D. N. Romanenko; V. V. Samoilov

2012-07-01T23:59:59.000Z

355

Rough sets on fuzzy approximation spaces and applications to distributed knowledge systems  

Science Journals Connector (OSTI)

A fuzzy relation is an extension of crisp relation on any set U. Fuzzy proximity relations on U are much more general and abundant than equivalence relations. The fuzzy approximation space which depends upon a fuzzy proximity relation defined on a set U is a generalisation of the concept of knowledge base. So, rough sets defined on fuzzy approximation spaces extend the concept of rough sets on knowledge bases. The results of the present paper extend the basic properties of rough sets and results involving set theoretic operations on types of rough sets that have been established in Tripathy and Mitra (2008).

D.P. Acharjya; B.K. Tripathy

2008-01-01T23:59:59.000Z

356

A study on some topological aspects of fuzzy sets, rough sets and soft sets; -.  

E-Print Network [OSTI]

??This thesis consists of three major parts viz., study of the topological notions of fuzzy sets, rough sets and soft sets. The first part consists (more)

Juthika, Mahanta

2013-01-01T23:59:59.000Z

357

Investigation of rotor blade roughness effects on turbine performance  

SciTech Connect (OSTI)

The cold air test program was completed on the SSME (Space Shuttle Main Engine) HPFTP (High-Pressure Fuel Turbopump) turbine with production nozzle vane rings and polished coated rotor blades with a smooth surface finish of 30[mu]in. (0.76 [mu]m) rms (root mean square). The smooth blades were polished by an abrasive flow machining process. The test results were compared with the air test results from production rough-coated rotor blades with a surface finish of up to 400 [mu]in. (10.16 [mu]m) rms. Turbine efficiency was higher for the smooth blades over the entire range tested. Efficiency increased 2.1 percentage points at the SSME 104 percent RPL (Rated Power Level) conditions. This efficiency improvement could reduce the SSME HPFTP turbine inlet temperature by 57 R (32K), increasing turbine durability. The turbine flow parameter increased and the midspan outlet swirl angle became more axial with the smooth rotor blades.

Boynton, J.L.; Tabibzadeh, R. (Rockwell International Corp., Canoga Park, CA (United States). Rocketdyne Div.); Hudson, S.T. (NASA-Marshall Space Flight Center, Huntsville, AL (United States))

1993-07-01T23:59:59.000Z

358

An approach to configuring product family using rough set theory  

Science Journals Connector (OSTI)

Configuration design is one of the most important elements in the design for product family, with which designers could customise products for customers according to their specific requirements. The traditional approach to configuring products is based on configuration rules which reflect the mapping relations between customer requirements and design variables. But how to acquire the configuration rules is becoming the bottleneck. A kind of general way is to depend on design experts themselves to create such rules. It would take plenty of time for design experts to establish rules database. As such, this paper presents a framework of configuration design for product family through giving the variant components with different attribute values, in which the acquisition of configuration rules is connected with the idea of data mining using the rough set theory from large numbers of historical design data instead of the design expert's experience. It can help not only design experts but also novice designers analyse the dependence between customer requirements and design parameters, and acquire the configuration rules hidden in the historical data easily.

Bin Zhu; Pingyu Jiang

2005-01-01T23:59:59.000Z

359

QUANTIFICATION OF DEFORMATION-INDUCED SURFACE ROUGHENING USING MODIFIED ROUGHNESS PARAMETERS AND FOURIER FILTERING.  

E-Print Network [OSTI]

Surfaces of metal sheets initially contain high frequency, low amplitude roughness components imparted during the rolling process. When plastic deformation is imposed, the amplitude of these free surface components increases, producing various kinds of morphological features including randomness, periodicity and waviness. The features often control key functional aspects of a metal surface, such as reflected image clarity, lubricant transport, and spot weldability. The key to understanding the evolution of topographical features on plastically deformed sheet surfaces involves characterizing those features using appropriate quantitative measures. In this study, selected roughness characterization tools are used to 3-D surface roughening of 6022-T4 Al sheets deformed in plane strain. Modified roughness parameters, viz., peak-to-valley mean-height roughness (Rmh) and 10 % mean-height roughness (Rpv), were used to characterize roughness amplitude in order to overcome the deficiencies inherent with the root mean square roughness (Rq). A new approach, in which the roughness pattern is divided into several regimes, was also used to investigate the frequency components that provide the major contributions to surface roughening. The Fast Fourier

unknown authors

360

On the limiting aerodynamic roughness of the ocean in very strong winds  

E-Print Network [OSTI]

On the limiting aerodynamic roughness of the ocean in very strong winds M. A. Donelan,1 B. K. Haus January 2004; accepted 13 August 2004; published 28 September 2004. [1] The aerodynamic friction between, the ``aerodynamic roughness'') increases with the wind speed. Can one merely extrapolate this wind speed tendency

Saltzman, Eric

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

A rough set-based association rule approach implemented on exploring beverages product spectrum  

Science Journals Connector (OSTI)

When items are classified according to whether they have more or less of a characteristic, the scale used is referred to as an ordinal scale. The main characteristic of the ordinal scale is that the categories have a logical or ordered relationship to ... Keywords: Association rule, Data mining, Ordinal scale data processing, Product spectrum, Rough set, Rough set association rule

Shu-Hsien Liao, Yin-Ju Chen

2014-04-01T23:59:59.000Z

362

Maximum Class Separability for Rough-Fuzzy C-Means Based Brain MR Image Segmentation  

E-Print Network [OSTI]

Maximum Class Separability for Rough-Fuzzy C-Means Based Brain MR Image Segmentation Pradipta Maji of brain MR images. The RFCM algorithm comprises a judicious integration of the of rough sets, fuzzy sets with vagueness and incompleteness in class definition of brain MR images, the membership function of fuzzy sets

Pal, Sankar Kumar

363

The Position of Rough Set in Soft Set: A Topological Approach  

Science Journals Connector (OSTI)

In this paper, the author presents the concept of topological space that must be used to show a relation between rough set and soft set. There are two main results presented; firstly, a construction of a quasi-discrete topology using indiscernibility ... Keywords: Indiscernibility Relation, Quasi Discrete, Rough Set Theory, Soft Set Theory, Topological Space

Tutut Herawan

2012-07-01T23:59:59.000Z

364

Three-Way Decision: An Interpretation of Rules in Rough Set Theory  

E-Print Network [OSTI]

Three-Way Decision: An Interpretation of Rules in Rough Set Theory Yiyu Yao Department of Computer theory is to induce classification or de- cision rules that indicate the decision class of an object. A new interpretation of rules in rough set theory is intro- duced. According to the positive, boundary

Yao, Yiyu

365

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

E-Print Network [OSTI]

#12;Independent External Peer Review Report ­ Rough River Dam 18 August 2011 ii This page intentionally blank. #12;Independent External Peer Review Report ­ Rough River Dam 18 August 2011 iii Table.3 Preparation and Charge for Peer Review Panel 7 3.4 Performing the IEPR 8 3.5 Preparation and Review of Draft

US Army Corps of Engineers

366

Segmentation of Rough Surfaces Using a Polarization Imaging Patrick Terrier, Vincent Devlaminck, Jean Michel Charbois  

E-Print Network [OSTI]

methods, that do not require contact with the surface and allow for high measurement speed, have been, based on light scattering[4], our goal is not to measure precisely the roughness, but to obtain. INTRODUCTION The conventional method for measuring surface roughness consists in moving a stylus probe touching

Paris-Sud XI, Université de

367

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

368

?-Dominance relation and rough sets in interval-valued information systems  

Science Journals Connector (OSTI)

Abstract Though rough set has been widely used to study systems characterized by insufficient and incomplete information, its performance in dealing with initial interval-valued data needs to be seriously considered for improving the suitability and scalability. The aim of this paper is to present a parameterized dominance-based rough set approach to interval-valued information systems. First, by considering the degree that an interval-valued data is dominating another one, we propose the concept of ?-dominance relation. Second, we present the ?-dominance based rough set model in interval-valued decision systems. Finally, we introduce lower and upper approximate reducts into ?-dominance based rough set for simplifying decision rules, we also present the judgement theorems and discernibility functions, which describe how lower and upper approximate reducts can be calculated. This study suggests potential application areas and new research trends concerning rough set approach to interval-valued information systems.

Xibei Yang; Yong Qi; Dong-Jun Yu; Hualong Yu; Jingyu Yang

2015-01-01T23:59:59.000Z

369

Topology of Surfaces Modelling Bridges and Tunnels in 3D-GIS Early Draft  

E-Print Network [OSTI]

: Well known errors are buildings floating above the terrain, buildings which are sunk in the terrain, for example, buildings are sunk in the terrain, a noise emission simulation tool will provide false results

Behnke, Sven

370

Matroidal structure of covering-based rough sets through the upper approximation number  

Science Journals Connector (OSTI)

Covering-based rough set theory is a generalisation of rough set theory. Matroids are based on linear algebra and graph theory, and have a variety of applications in many fields. In this paper, we introduce matroid theory to covering-based rough sets, and explore the matroidal structure and properties of covering-based rough sets. Specifically, we define the upper approximation number to establish the matroidal structure of covering-based rough sets. So many important concepts and methods in matroid theory can be employed to investigate covering-based rough sets. The rank plays a very important role in a matrix, so we use the rank function of the matroid induced by a covering to measure the covering. With the rank function, a pair of approximation operators, namely, matroid approximation operators, are constructed. This type of approximation operators not only inherits the properties of those traditional ones which are defined from the perspective of set theory, but also presents some new properties. Finally, the matroid upper approximations are compared with the second upper approximations in covering-based rough sets.

Shiping Wang; William Zhu

2011-01-01T23:59:59.000Z

371

Model-based Trajectory Control of Robots with Pneumatic Actuator Dynamics  

E-Print Network [OSTI]

on underactuated robots. We present two case studies: an underactuated cart-pole system with the cart driven and applications; for example, hydraulic actuators are used in the rough-terrain quadruped robot[1] and force]. Pneumatic actuators have some advantages over hydraulic actuators, such as clean operation, easy handling

Tedrake, Russ

372

University of Delaware Technical Analysis for On-Site Wind Generation  

E-Print Network [OSTI]

Energy Developments, Inc. Tuesday, May 19, 2009 #12;Final Report ­ Technical Analysis for On-site Wind. Gross P.E. prepared Section 4, Electrical System Impact Study and AWSTruewind, LLC provided wind.3 TERRAIN AND ROUGHNESS MAPS 12 2.4 RESOURCE GRID 13 2.5 WIND TURBINE POWER CURVE 14 2.6 SUMMMARY OF MODEL

Firestone, Jeremy

373

Offshore Wind Turbines and Their Installation  

Science Journals Connector (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

374

Rough Set Based Information Retrieval from Argumentative Data Points in Sea Woo Kim*, Chin-Wan Chung  

E-Print Network [OSTI]

Rough Set Based Information Retrieval from Argumentative Data Points in Weblogs Sea Woo Kim*, Chin as an object oriented 3- Dimensional system. The goal of our approach is to generate rules from rough sets and to represent them in a 3-dimensional interactive program, Blog Cosmos. We used rough set theory as a candidate

Chung, Chin-Wan

375

The theory of rough sets, introduced by Pawlak in 1982, has recently emerged as a major mathe-  

E-Print Network [OSTI]

Preface The theory of rough sets, introduced by Pawlak in 1982, has recently emerged as a major. The focus of rough set theory is on the ambi- guity caused by limited discernibility of objects, rough set theory and granular computation has proven to be another soft com- puting tool which

Pal, Sankar Kumar

376

IEEE TRANSACTIONS ON FUZZY SYSTEMS, VOL. 15, NO. 1, FEBRUARY 2007 121 Fuzzy Rough Sets: The Forgotten Step  

E-Print Network [OSTI]

IEEE TRANSACTIONS ON FUZZY SYSTEMS, VOL. 15, NO. 1, FEBRUARY 2007 121 Fuzzy Rough Sets: The Forgotten Step Martine De Cock, Chris Cornelis, and Etienne E. Kerre Abstract--Traditional rough set theory-equivalence relation. However, none of the existing studies on fuzzy rough set theory tries to exploit the fact

Gent, Universiteit

377

On Sea Surface Roughness Parameterization and Its Effect on Tropical Cyclone Structure and Intensity  

E-Print Network [OSTI]

On Sea Surface Roughness Parameterization and Its Effect on Tropical Cyclone Structure and Earth Science and Technology, University of Hawaii at Manoa, Honolulu, HI 96822 Yihong Duan National 10, 2009 (Revised) Dateline Revised for Advances in Atmospheric Sciences Corresponding author

Wang, Yuqing

378

Application of fuzzy SOFM neural network and rough set theory on fault diagnosis for rotating machinery  

Science Journals Connector (OSTI)

This paper presents a new method that applies fuzzy logic, rough set theory and SOFM neural network to rotating machinery fault diagnosis. In this method, firstly, relationships between the fault causations and fault symptoms are established by fuzzy ...

Dongxiang Jiang; Kai Li; Gang Zhao; Jinhui Diao

2005-05-01T23:59:59.000Z

379

Using support vector machines and rough sets theory for classifying faulty types of diesel engine  

Science Journals Connector (OSTI)

Support vector machines (SVM) and rough sets theory (RST) are two emerging techniques in data analysis. The RST can deal with vague data and remove redundant attributes without losing any information of the data; and SVM has powerful classification ability. ...

Ping-Feng Pai; Yu-Ying Huang

2007-08-01T23:59:59.000Z

380

Improved Global Bathymetry, Global Sea Floor Roughness, and Deep Ocean Mixing  

E-Print Network [OSTI]

substantial kinetic energy in the M2 tide and a rough seaenergy of M2 tide .75integrated kinetic energy of the M 2 tide (J/m 2 ) Figure 4-

Becker, Joseph J

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.


381

Improved global bathymetry, global sea floor roughness, and deep ocean mixing  

E-Print Network [OSTI]

substantial kinetic energy in the M2 tide and a rough seaenergy of M2 tide .75integrated kinetic energy of the M 2 tide (J/m 2 ) Figure 4-

Becker, Joseph Jeffrey

2008-01-01T23:59:59.000Z

382

Reduction of vortex induced forces and motion through surface roughness control  

DOE Patents [OSTI]

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

Bernitsas, Michael M; Raghavan, Kamaldev

2014-04-01T23:59:59.000Z

383

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...

Ding, L.; Ruan, X.; Huang, J.; Li, Y.

2006-01-01T23:59:59.000Z

384

Fuzzy Set Extensions of the Dominance-Based Rough Set Approach  

Science Journals Connector (OSTI)

Rough set theory has been proposed by Pawlak in ... operates on an information table composed of a set U of objects described by a set Q of condition and decision attributes. Decision attributes make a partition ...

Salvatore Greco; Benedetto Matarazzo

2008-01-01T23:59:59.000Z

385

Comparative Study on Mathematical Foundations of Type-2 Fuzzy Set, Rough Set and Cloud Model  

Science Journals Connector (OSTI)

Mathematical representation of a concept with uncertainty is one of foundations of Artificial Intelligence. The type-2 fuzzy set introduced by Mendel studies fuzziness of the membership grade of a concept. Rough

Deyi Li

2010-01-01T23:59:59.000Z

386

Wind Speed Retrieval Based on Sea Surface Roughness Measurements from Spaceborne Microwave Radiometers  

Science Journals Connector (OSTI)

Wind speed is the main factor responsible for the increase in ocean thermal emission because sea surface emissivity strongly depends on surface roughness. An alternative approach to estimate the surface wind speed (SWS) as a function of surface ...

Sungwook Hong; Inchul Shin

2013-02-01T23:59:59.000Z

387

Estimation of sector roughness lengths and the effect on prediction of the vertical wind speed profile  

Science Journals Connector (OSTI)

An estimate of roughness length is required by some atmospheric models and is also used in the logarithmic profile to determine the increase of wind speed with height under neutral conditions. The choice ... thei...

R. J. Barthelmie; J. P. Palutikof; T. D. Davies

1993-10-01T23:59:59.000Z

388

Enhancement of induced V polarization due to rough interfaces in polycrystalline V/Fe/V trilayers  

E-Print Network [OSTI]

, and polarized neutron reflectometry. Trilayer samples were sputter deposited onto Si substrates at room with the neutron and resonant x-ray data. Notably, this value for structurally rough interfaces is significantly

Haskel, Daniel

389

Roughness-induced Transient Growth: Continuous-spectrum Receptivity and Secondary Instability Analysis  

E-Print Network [OSTI]

] investigated the boundary layer response to an array of roughness elements that were both repeatable and of significant size. He arranged an array of spheres on a flat plate and contrasted results with single spheres and multi-sphere arrays. These spheres....S., Case Western Reserve University Chair of Advisory Committee: Dr. Edward White This dissertation analyzes the effect of periodic roughness elements on the stability of a flat plate boundary layer. Receptivity data is extracted from direct numerical...

Denissen, Nicholas Allen

2012-07-16T23:59:59.000Z

390

Modeling shallow?water propagation with an appropriate sea?surface roughness spectrum  

Science Journals Connector (OSTI)

Predictions for shallow?water acoustic propagation are usually accomplished assuming a deep?water spectrum for the sea surface roughness. In addition the effect of surface roughness is normally included through a loss mechanism. However for waveguide propagation the surface roughness mainly causes a redistribution of energy and therefore the use of an accurate model to handle roughness is essential to obtaining accurate results. In order to properly model shallow?water surface roughness the parametric spectrum GONO [Sanders and Bruinsma Wave Dynamics and Radio Probing of the Ocean Surface edited by O. M. Phillips and K. Hassemann (Plenum New York 1986) pp. 615637] has been implemented. This spectrum is appropriate for wind?driven surfaces in waters ranging in depth from 15 to 100 m. To investigate the impact that different spectra has on the propagating field predictions using GONO and PiersonMoskowitz spectra are compared for different environments and at frequencies typical of active and passive sonars. An acoustic propagationmodel which includes a conformal mapping algorithm to properly handle sea surface roughness [Norton et al. J. Acoust. Soc. Am. 97 21732180 (1995)] is used to generate the numerical results. [Work supported by ONR.

Guy V. Norton; Jorge C. Novarini

1996-01-01T23:59:59.000Z

391

Automatic determination about precision parameter value based on inclusion degree with variable precision rough set model  

Science Journals Connector (OSTI)

Abstract The rough set theory provides a powerful approach for attributes reduction and data analysis. The variable precision rough set (VPRS) model, an extension of the original rough set approach, tolerates misclassifications of the training data to some degree, which promotes the applications of rough set theory in inconsistent information systems. However, in most existing algorithms of feature reduction based on VPRS, the precision parameter (?) is introduced as prior knowledge, which restricts their applications because it is not clear how to set the ? value. By studying ?-consistency in the measurement of a decision table and the threshold value of the ?-consistent decision table, this paper presents an algorithm for automatic determination of the precision parameter value from a decision table based on VPRS. At the same time, the precision parameter value from our proposed method is compared with the thresholds from the decision-theoretic rough set (DTRS). The influences of the precision parameter are also discussed on attribute reduction, which shows the necessity of the estimated precision parameter from a decision table. The simulation results including VPRS and other classification methods in real data further indicate that different precision parameter values make a great difference on rules and setting a precise parameter near the threshold value of the ?-consistent decision table can precisely reflect the decision distribution of the decision table.

Yusheng Cheng; Wenfa Zhan; Xindong Wu; Yuzhou Zhang

2015-01-01T23:59:59.000Z

392

Fluid flow at the interface between elastic solids with randomly rough surfaces  

E-Print Network [OSTI]

I study fluid flow at the interface between elastic solids with randomly rough surfaces. I use the contact mechanics model of Persson to take into account the elastic interaction between the solid walls and the Bruggeman effective medium theory to account for the influence of the disorder on the fluid flow. I calculate the flow tensor which determines the pressure flow factor and, e.g., the leak-rate of static seals. I show how the perturbation treatment of Tripp can be extended to arbitrary order in the ratio between the root-mean-square roughness amplitude and the average interfacial surface separation. I introduce a matrix D(Zeta), determined by the surface roughness power spectrum, which can be used to describe the anisotropy of the surface at any magnification Zeta. I present results for the asymmetry factor Gamma(Zeta) (generalized Peklenik number) for grinded steel and sandblasted PMMA surfaces.

B. N. J. Persson

2010-04-07T23:59:59.000Z

393

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

SciTech Connect (OSTI)

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

Naulleau, Patrick; George, Simi

2011-01-26T23:59:59.000Z

394

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

E-Print Network [OSTI]

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

Nicholas Guttenberg; Nigel Goldenfeld

2008-08-11T23:59:59.000Z

395

A decision making model using soft set and rough set on fuzzy approximation spaces  

Science Journals Connector (OSTI)

In modern era of computing, there is a need of development in data analysis and decision making. Most of our tools are crisp, deterministic and precise in character. But general real life situations contains uncertainties. To handle such uncertainties many theories are developed such as fuzzy set, rough set, rough set on fuzzy approximation spaces etc. But all these theories have their own limitations. To overcome the limitations, the concept of soft set is introduced. But, soft set also fails if the attributes in the information system are almost identical rather exactly identical. In this paper, we propose a decision making model that consists of two processes such as preprocess and postprocess to mine decisions. In preprocess we use rough set on fuzzy approximation spaces to get the almost equivalence classes whereas in postprocess we use soft set techniques to obtain decisions. The proposed model is tested over an institutional dataset and the results show practical viability of the proposed research.

T.K. Das; D.P. Acharjya

2014-01-01T23:59:59.000Z

396

Enhancement of induced V polarization due to rough interfaces in polycrystalline V/Fe/V trilayers  

SciTech Connect (OSTI)

The effect of interface roughness on the induced polarization of V in polycrystalline V/Fe/V trilayers was investigated with x-ray magnetic circular dichroism, x-ray resonant magnetic scattering, and polarized neutron reflectometry. Trilayer samples were sputter deposited onto Si substrates at room temperature to minimize interdiffusion. The films were polycrystalline and exhibited an average 0.5 nm root-mean-square interfacial roughness at the Fe/V interfaces. The induced polarization found in V was constrained to the Fe/V interface extending approximately up to 2-3 monolayers into the V and exhibited antiferromagnetic alignment to the Fe layer. A magnetic moment for V ranging between -0.46 and -0.86 {micro}{sub B}/V atom is consistent with the neutron and resonant x-ray data. Notably, this value for structurally rough interfaces is significantly larger than that reported for samples with atomically flat Fe/V interfaces.

Clavero, C.; Sanchez-Hanke, C.; Skuza, R.; Choi,Y.; Loloee,R.; Zhernenkov, M.; Fitzsimmons, M.R.; Lukaszew, R.A

2009-07-20T23:59:59.000Z

397

Interfacial separation between elastic solids with randomly rough surfaces: comparison of experiment with theory  

E-Print Network [OSTI]

We study the average separation between an elastic solid and a hard solid with a nominal flat but randomly rough surface, as a function of the squeezing pressure. We present experimental results for a silicon rubber (PDMS) block with a flat surface squeezed against an asphalt road surface. The theory shows that an effective repulse pressure act between the surfaces of the form p proportional to exp(-u/u0), where u is the average separation between the surfaces and u0 a constant of order the root-mean-square roughness, in good agreement with the experimental results.

B. Lorenz; B. N. J. Persson

2008-10-06T23:59:59.000Z

398

On the Compliance of Simbol-X Mirror Roughness with its Effective Area Requirements  

SciTech Connect (OSTI)

Surface microroughness of X-ray mirrors is a key issue for the angular resolution of Simbol-X to comply with the required one (<20 arcsec at 30 keV). The maximum tolerable microroughness for Simbol-X mirrors, in order to satisfy the required imaging capability, has already been derived in terms of its PSD (Power Spectral Density). However, also the Effective Area of the telescope is affected by the mirror roughness. In this work we will show how the expected effective area of the Simbol-X mirror module can be computed from the roughness PSD tolerance, checking its compliance with the requirements.

Spiga, D.; Basso, S.; Cotroneo, V.; Pareschi, G.; Tagliaferri, G. [INAF/Osservatorio Astronomico di Brera-Via Bianchi 46-23807 Merate (Italy)

2009-05-11T23:59:59.000Z

399

Investigation of wall friction in noncircular ducts with a rough liner  

E-Print Network [OSTI]

phenomena in circular rough ducts and. these test data are discussed. 2. The test data of this research are similar to that shown by Nikuradse for fluid flow in pipes having artifi- cially roughened, inside surfaces. It is doubtful if Golebrook... in the relative roughness of the duct. The curves of Reynolds number versus friction factor are somewhat similar to those plotted by Nikuradse for fluid flow in artificially roughened round pipe. The shape of the curves is quite similar, but there is a...

Tyler, John Charles

2012-06-07T23:59:59.000Z

400

Unsupervised feature selection in digital mammogram image using rough set theory  

Science Journals Connector (OSTI)

Feature Selection (FS) is a process which attempts to select features which are more informative. In this paper, a novel unsupervised FS in mammogram images, using rough set-based relative dependency measures, is proposed. A typical mammogram image processing system generally consists of mammogram image acquisition, pre-processing of image, segmentation and features extraction from the segmented mammogram image. The proposed unsupervised FS method is used to select features from data sets; the method is compared with existing rough set based supervised FS methods, and the classification performance of both methods are recorded and demonstrate the efficiency of this method.

K. Thangavel; C. Velayutham

2012-01-01T23:59:59.000Z

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

Y.Y. Yao, Three-way decisions with probabilistic rough sets, Information Sciences, Vol. 180, No. 3, pp. 341-353, 2010.  

E-Print Network [OSTI]

model. The results enrich the rough set theory by ideas from Bayesian decision theory and hypothesis of incorrect decisions make the rough set theory practical in applications. Key words: Decision-theoretic roughY.Y. Yao, Three-way decisions with probabilistic rough sets, Information Sciences, Vol. 180, No. 3

Yao, Yiyu

402

FRICTION FACTOR IN HIGH PRESSURE NATURAL GAS PIPELINES FROM ROUGHNESS MEASUREMENTS  

E-Print Network [OSTI]

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

Gudmundsson, Jon Steinar

403

Rough Set Dependency Analysis in Evaluation Studies An Application in the Study of Repeated Heart Attacks  

E-Print Network [OSTI]

of repeated heart attacks. 1 Introduction In many cases it is not possible to obtain complete ­ or certain analysis can be applied to an investi- gation into the causes of repeated heart attacks con- ductedRough Set Dependency Analysis in Evaluation Studies ­ An Application in the Study of Repeated Heart

Düntsch, Ivo

404

Numerical simulation of noise generated by multi asperity contact between rough surfaces  

E-Print Network [OSTI]

. The validation of the method is then discussed by comparison with the finite element software Abaqus and someNumerical simulation of noise generated by multi asperity contact between rough surfaces V.H. Dang at the interface that convert a part of the kinetic energy of the sliding solid into acoustical energy. 1

Paris-Sud XI, Université de

405

Application of an acoustic backscatter technique for characterizing the roughness of porous soil  

E-Print Network [OSTI]

allow the water from rainfall to pool. Much work has been done to examine the effects of roughness to erosion control of agricultural sur- faces since it impedes water run-off. If a fallow agricultural field on soil erosion.1­4 For soil conservation use it is important to have the ability to rapidly quantify

Illinois at Urbana-Champaign, University of

406

Safety First Safety Last Safety Always Roughly one out of every four accidents (25%) involves  

E-Print Network [OSTI]

Safety First Safety Last Safety Always Roughly one out of every four accidents (25%) involves at an unsafe speed · Failure to check mirrors often Fleet Safety: Backing Accidents Safety Tip #2 Accidents hurt-- safety doesn't. All backing accidents are preventable. The key is to plan ahead to avoid backing

Minnesota, University of

407

Experimental study on flow and ventilation behaviours over idealised urban roughness  

Science Journals Connector (OSTI)

Flows in the urban boundary layer (UBL) are strongly affected by the inhomogeneous roughness elements at the bottom surface. In particular, in the near-ground region (roughness sublayer), the effect of the surface roughness dominates that complicates the behaviours of mean flow and turbulence and subsequently the near-wall transport processes. To safeguard the health of urban inhabitants, it is crucial to develop an in-depth understanding of the correlation among near-wall fluid motions, UBL turbulence and city ventilation. However, rather limited information is available. In this study, physical modelling in a laboratory wind tunnel is employed to measure the profiles of both stream-wise and vertical velocities over an array consisting of idealised two-dimensional (2D) roughness elements. Various arrangements are adopted in attempt to cover different flow regimes to examine city ventilation problems. The ventilation performance is measured by the air exchange rate (ACH). Consistent with our previous large-eddy simulation (LES) results, the current wind tunnel measurements suggest that city ventilation is dominated by the ACH turbulent component, i.e., air masses are mainly driven by atmospheric turbulence (at least 80% of the total ACH).

Yat-Kiu Ho; Chun-Ho Liu

2014-01-01T23:59:59.000Z

408

Entropy of English text: Experiments with humans and a machine learning system based on rough sets  

E-Print Network [OSTI]

different types of text material (Shannon used only a single book). We also show how the results are affected when we replace the human subjects with a machine learning system based on rough sets. Automating the play of the guessing game with this system...

Moradi, H.; Grzymala-Busse, Jerzy W.; Roberts, James A.

1998-01-01T23:59:59.000Z

409

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

E-Print Network [OSTI]

Geometrical and transport properties of single fractures: influence of the roughness of the fracture walls H. Auradou Univ Pierre et Marie Curie-Paris6, Univ Paris-Sud, CNRS, F-91405. Lab FAST, Bat reviews the main features of the transport properties of single fractures. A particular attention paid

Paris-Sud XI, Université de

410

Patch dynamics and stability in steep, rough streams E. M. Yager,1  

E-Print Network [OSTI]

Patch dynamics and stability in steep, rough streams E. M. Yager,1 W. E. Dietrich,2 J. W. Kirchner boulders and more mobile patches of gravel and cobbles. Little is known about how variability in flow and sediment flux affect the area, thickness, composition, and grain mobility of sediment patches. To better

Kirchner, James W.

411

Evaluation of bedload transport predictions using flow resistance equations to account for macro-roughness in  

E-Print Network [OSTI]

August 2011. [1] Steep mountain streams typically feature macro-roughness elements like boulders, step measured annually, and for the other seven streams sediment volume estimates were available for large flood during floods is a frequent natural haz- ard. Using data from the Swiss flood and landslide damage

Kirchner, James W.

412

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

E-Print Network [OSTI]

­Weisbach formula is modified to account for vegetative resistance by application of surface roughness lengths appropriate friction factors. Schlicting 1955 reviews the relationship between the Ni- kuradsse's equivalent 1996 developed and calibrated procedures to estimate flow resistance based on the Colebrook

413

Department of Chemistry, University of California, Berkeley, CA 94720 Finding transition pathways: throwing ropes over rough  

E-Print Network [OSTI]

rugged line indicates the roughness that generally characterizes the potential energy surface of a high pass between the stable states, the resulting transmission coefficient would be very small, and its a plateau value that is very small compared to , so small that the computation is a nearly impractical route

Chandler, David

414

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

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

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

Brent Newman; Heather Throckmorton

415

Estimation of the aerodynamic roughness length in arid and semi-arid regions over the globe with the ERS scatterometer  

E-Print Network [OSTI]

Estimation of the aerodynamic roughness length in arid and semi-arid regions over the globe 2005. [1] Estimates of the aerodynamic roughness lengths z0 in arid and semi-arid regions: Prigent, C., I. Tegen, F. Aires, B. Marticorena, and M. Zribi (2005), Estimation of the aerodynamic

Aires, Filipe

416

Soft X-ray reflectometry applied to the evaluation of surface roughness variation during the deposition of thin films  

E-Print Network [OSTI]

1645 Soft X-ray reflectometry applied to the evaluation of surface roughness variation during). The surface roughness evolution was calculated as a function of thickness from the soft X-ray reflectance Abstracts 07.60H - 68.20 - 68.55 - 78.65 Introduction. Soft X-ray reflectometry (SXR) was introduced

Boyer, Edmond

417

X-ray resonant magnetic scattering from structurally and magnetically rough interfaces in multilayered systems. I. Specular reflectivity  

E-Print Network [OSTI]

X-ray resonant magnetic scattering from structurally and magnetically rough interfaces formulation of x-ray resonant magnetic scattering from rough surfaces and interfaces is given for specular/Fe multilayer. DOI: 10.1103/PhysRevB.68.224409 PACS number s : 75.70.Cn, 61.10.Kw I. INTRODUCTION X-ray

Haskel, Daniel

418

A weighted bee colony optimisation hybrid with rough set reduct algorithm for feature selection in the medical domain  

Science Journals Connector (OSTI)

Feature selection refers to the problem of selecting the set of most relevant features which produces the most predictive outcome. Rough set theory has been one of the most successful methods used for feature selection. However, this method is still not able to find the optimal subsets. This paper proposes a new feature selection method based on rough set theory hybrid with a weighted bee colony optimisation (WBCO) in an attempt to combat this. This proposed work is applied in the medical domain to find the minimal reducts and experimentally compared with the existing rough set methods, rough set methods with computational intelligence and non-rough set methods. The performance is analysed with a novel genetic algorithm-based k-nearest neighbour (GkNN) classifier. The experiments and results show that our proposed method could find optimum reducts than the other algorithms.

N. Suguna; K. Thanushkodi

2011-01-01T23:59:59.000Z

419

Interfacial Friction in Gas-Liquid Annular Flow: Analogies to Full and Transition Roughness  

SciTech Connect (OSTI)

New film thickness and pressure gradient data were obtained in a 5.08 by 101.6 mm duct for nitrogen and water in annular flow. Pressures of 3.4 and 17 atm and temperatures of 38 and 93 C were used to vary the gas density and liquid viscosity. These data are used to compute interfacial shear stresses and interfacial friction factors for comparison with several accepted literature correlations. These comparisons are reasonable for small values of the relative film thickness. However, the new data cover conditions not approached by the data used to construct those correlations. By combining the current data with the results of two other comprehensive modern experimental studies, a new correlation for the interfacial friction factor has been developed. This correlation adds elements of transition roughness to Wallis' fully-rough analogy to better predict interfacial friction factors over a wide range of gas Reynolds numbers and liquid film thicknesses.

Bauer, R.C.; Beus, S.G.; Fore, L.B.

1999-03-01T23:59:59.000Z

420

Partial order relation for approximation operators in covering based rough sets  

Science Journals Connector (OSTI)

Abstract Covering based rough sets are a generalization of classical rough sets, in which the traditional partition of the universe induced by an equivalence relation is replaced by a covering. Many definitions have been proposed for the lower and upper approximations within this setting. In this paper, we recall the most important ones and organize them into sixteen dual pairs. Then, to provide more insight into their structure, we investigate order relationships that hold among the approximation operators. In particular, we study a point-wise partial order for lower (resp., upper) approximation operators, that can be used to compare their respective approximation fineness. We establish the Hasse diagram for the partial order, showing the relationship between any pair of lower (resp., upper) operators, and identifying its minimal and maximal elements.

Mauricio Restrepo; Chris Cornelis; Jonatan Gmez

2014-01-01T23:59:59.000Z

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.


421

A rough set-based corporate memory for the case of ecotourism  

Science Journals Connector (OSTI)

Abstract Corporate memory (CM) is a major asset of any modern organization and provides access to the strategic knowledge and experience making a company more competitive. Until now, CM has not been broadly applied to tourisms, where changes are rapid, both in the nature of eco-tourist behavior and impact on the environment. In order to develop sustainable ecotourism, agile decision-making based on rules induced from data is required. However, ecotourism often provides numerous qualitative data. The qualitative nature of the data makes it difficult to analyze using standard statistical techniques. The rough set approach is suitable for processing qualitative information. In this paper, the proposed CM is incorporated within the rough set in the tourism sector, to provide efficient knowledge management for resolving the problems: (1) to understand the purposes for traveling of tourists and their feedback, and (2) to improve a travel package for attracting valued eco-tourists and reducing environmental damage.

Chun-Che Huang; Wen-Yau Liang; Tzu-Liang (Bill) Tseng; Ruo-Yin Wong

2015-01-01T23:59:59.000Z

422

An intelligent knowledge mining model for kidney cancer using rough set theory  

Science Journals Connector (OSTI)

Medical diagnosis processes vary in the degree to which they attempt to deal with different complicating aspects of diagnosis such as relative importance of symptoms, varied symptom pattern and the relation between diseases themselves. Rough set approach has two major advantages over the other methods. First, it can handle different types of data such as categorical, numerical etc. Secondly, it does not make any assumption like probability distribution function in stochastic modeling or membership grade function in fuzzy set theory. It involves pattern recognition through logical computational rules rather than approximating them through smooth mathematical functional forms. In this paper we use rough set theory as a data mining tool to derive useful patterns and rules for kidney cancer faulty diagnosis. In particular, the historical data of twenty five research hospitals and medical college is used for validation and the results show the practical viability of the proposed approach.

M.A. Saleem Durai; D.P. Acharjya; A. Kannan; N.Ch. Sriman Narayana Iyengar

2012-01-01T23:59:59.000Z

423

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

DOE Patents [OSTI]

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

424

Roughing It: A Mantellid Poison Frog Shows Greater Alkaloid Diversity in Some Disturbed Habitats  

Science Journals Connector (OSTI)

Roughing It: A Mantellid Poison Frog Shows Greater Alkaloid Diversity in Some Disturbed Habitats# ... The alkaloids in mantellids are typically of a molecular weight less than 400 amu and are mainly of the izidine classes, e.g., pyrrolizidines, indolizidines, and quinolizidines, the latter two sometimes elaborated with complex side-chains as in the pumiliotoxin and homopumiliotoxin classes, respectively (Figure 1). ... Representative alkaloid structures of each class observed in the current study. ...

Nirina R. Andriamaharavo; H. Martin Garraffo; Ralph A. Saporito; John W. Daly; Christian R. Razafindrabe; Marta Andriantsiferana; Thomas F. Spande

2010-02-23T23:59:59.000Z

425

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

E-Print Network [OSTI]

reflected back to space by a factor of two (Baran 2012; Ulanowski et al. 2006). Particle shape can also have a large impact on the radiative properties and can influence the cloud radiative forcing. To reduce these uncertainties and deliver more accurate... rosettes, plates, and columns. Surface roughness has been observed in laboratory measurements of ice and in field campaigns (Baran et al. 2011; Ulanowski et al. 2006). Thermodynamic conditions influence whether an ice particle is roughened and how...

Cole, Benjamin

2013-07-29T23:59:59.000Z

426

Dominance-based rough set approach and analytic network process for assessing urban transformation scenarios  

Science Journals Connector (OSTI)

The paper shows the contribution that two different multiple criteria decision aiding (MCDA) methods could provide in the field of strategic decisions and urban and territorial planning. In particular, the analytic network process and the dominance-based rough set approach have been considered and discussed in the work with reference to their role in supporting such decision-making processes, trying to compare the different contributions given by the two approaches in this specific domain of application.

Francesca Abastante; Marta Bottero; Salvatore Greco; Isabella M. Lami

2013-01-01T23:59:59.000Z

427

The Three-Dimensional Morphology of Stylolites: Roughness Analysis and Possible Genetic Implications  

SciTech Connect (OSTI)

Stylolites are dynamic roughly planar surfaces formed by pressure solution of blocks of rocks into each other. The three-dimensional geometry of 12 bedding-parallel stylolites in several limestones was measured using laser and mechanical profilometers, and statistical characteristics of the surfaces were calculated. All the stylolites analyzed turn out to have self-affine fractal roughness with a well-characterized crossover length scale separating two self-affine regimes. Strikingly, this characteristic length scale falls within a very narrow range for all the stylolites studied, regardless of the microstructure sizes. To explain the data, we propose a continuous phenomenological model that accounts for the development of the measured roughness from an initially flat surface. The model postulates that the complex interface morphology is the result of competition between the long-range elastic redistribution of local stress fluctuations, which roughen the surface, and surface tension forces along the interface, which smooth it. The model accounts for the geometrical variability of stylolite surfaces and predicts the dependence of the crossover length scale on the mechanical properties of the rock.

Francois Renard; Jean Schmittbuhl; Jean-Pierre Gratier; Paul Meakin; Enrique Merino

2004-02-01T23:59:59.000Z

428

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.

Andrs Santos; Gilberto M. Kremer; Vicente Garz

2010-07-16T23:59:59.000Z

429

Dopant atom clustering and charge screening induced roughness of electronic interfaces in GaAs p-n multilayers  

Science Journals Connector (OSTI)

The roughness of the electronic interfaces of p-n GaAs multilayers is investigated by cross-sectional scanning tunneling microscopy. Two physically different contributions to the roughness are found, both much larger than the underlying atomically sharp metallurgical interface. The roughness arises from the individual electrostatic screening fields around each dopant atom near the interface and from a clustering of dopant atoms. The latter leads to charge-carrier-depleted zones extending locally through the entire nominally homogeneously doped layer for layer thicknesses close to the cluster dimension, hence limiting the precision of the spatial and energetic positioning of the Fermi energy in nanoscale semiconductor structures.

N. D. Jger, K. Urban, E. R. Weber, and Ph. Ebert

2002-05-24T23:59:59.000Z

430

Yao, Y.Y., Decision-theoretic Rough Set Models (DTRSM) Computer Science (Ji Suan Ji Ke Xue), Vol. 35, No. 8A, pp. 7-8, 2008.  

E-Print Network [OSTI]

Yao, Y.Y., Decision-theoretic Rough Set Models (DTRSM) Computer Science (Ji Suan Ji Ke Xue), Vol. 35, No. 8A, pp. 7-8, 2008. Decision-Theoretic Rough Set Models (DTRSM) Yiyu (Y.Y.) Yao Department://www.cs.uregina.ca/~yyao The standard rough sets model is a qualitative model that defines three regions for approximating a subset

Yao, Yiyu

431

44 IEEE TRANSACTIONS ON ELECTRONICS PACKAGING MANUFACTURING, VOL. 24, NO. 1, JANUARY 2001 Rough Set Theory: A Data Mining Tool for  

E-Print Network [OSTI]

44 IEEE TRANSACTIONS ON ELECTRONICS PACKAGING MANUFACTURING, VOL. 24, NO. 1, JANUARY 2001 Rough Set of new knowledge, and autonomous decision- making. In this paper, the basic concepts of rough set theory and other aspects of data mining are introduced. The rough set theory offers a viable approach

Kusiak, Andrew

432

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

Science Journals Connector (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

433

Developing a Knowledge-Based System Using Rough Set Theory and Genetic Algorithms for Substation Fault Diagnosis  

Science Journals Connector (OSTI)

This chapter proposes a novel and hybrid approach using Rough Set Theory and a Genetic Algorithm (RS-GA) indexrough hybrid to extract knowledge from a set of events captured by (microprocessor based) protection, ...

Ching Lai Hor; Peter Crossley; Simon Watson

2009-01-01T23:59:59.000Z

434

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

SciTech Connect (OSTI)

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

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

2006-03-06T23:59:59.000Z

435

Fluid squeeze-out between rough surfaces: comparison of theory with experiment  

E-Print Network [OSTI]

We study the time dependency of the (average) interfacial separation between an elastic solid with a flat surface and a rigid solid with a randomly rough surface, squeezed together in a fluid. We use an analytical theory describing the fluid flow factors, based on the Persson contact mechanics theory and the Bruggeman effective medium theory, to calculate the removal of the fluid from the contacting interface of the two solids. In order to test this approach, we have performed simple squeeze-out experiments. The experimental results are compared to the theory predictions.

B. Lorenz; B. N. J. Persson

2011-02-07T23:59:59.000Z

436

Effect of residual stress and surface roughness on the fatigue behaviour of aluminium matrix composites  

Science Journals Connector (OSTI)

In this investigation the fatigue properties of specimens manufactured with different turning parameters were investigated in stress-controlled constant amplitude tests at ambient temperature. The change of feed rate and depth of cut lead to a change in the near surface microstructure. Hence the fatigue properties were influenced significantly due to different surface roughness and surface residual stress resulting from the unequal turning processes. The cyclic deformation behaviour of AMC225xe is characterised by pronounced initial cyclic hardening. Continuous load increase tests allow a reliable estimation of the endurance limit of AMC225xe with one single specimen on the basis of cyclic deformation, temperature and electrical resistance data.

M Smaga; D Eifler

2010-01-01T23:59:59.000Z

437

Anomalous scaling and super-roughness in the growth of CdTe polycrystalline films  

E-Print Network [OSTI]

CdTe films grown on glass substrates covered by fluorine doped tin oxide by Hot Wall Epitaxy (HWE) were studied through the interface dynamical scaling theory. Direct measures of the dynamical exponent revealed an intrinsically anomalous scaling characterized by a global roughness exponent $\\alpha$ distinct from the local one (the Hurst exponent $H$), previously reported [Ferreira \\textit{et al}., Appl. Phys. Lett. \\textbf{88}, 244103 (2006)]. A variety of scaling behaviors was obtained with varying substrate temperature. In particular, a transition from a intrinsically anomalous scaling regime with $H\

Anglica S. Mata; Silvio C. Ferreira, Jr.; Igor R. B. Ribeiro; Sukarno O. Ferreira

2011-01-06T23:59:59.000Z

438

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

E-Print Network [OSTI]

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

G. Gioia; Pinaki Chakraborty

2005-07-08T23:59:59.000Z

439

Extraction of design rules from multi-objective design exploration (MODE) using rough set theory  

Science Journals Connector (OSTI)

Multi-objective design exploration (MODE) and its application for design rule extraction are presented. MODE reveals the structure of design space from the trade-off information. The self-organizing map (SOM) is incorporated into MODE as a visual data-mining tool for design space. SOM divides the design space into clusters with specific design features. The sufficient conditions for belonging to a cluster of interest are extracted using rough set theory. The resulting MODE was applied to the multidisciplinary wing design problem, which revealed a cluster of good designs, and we extracted the design rules of such designs successfully.

Shigeru Obayashi

2011-01-01T23:59:59.000Z

440

An efficient classifier design integrating Rough Set and Dempster-Shafer Theory  

Science Journals Connector (OSTI)

An integrated approach of knowledge discovery has been proposed in the paper using Rough Set Theory (RST) and Dempster-Shafer's (D-S) theory where high dimensional data is reduced in two folds. Firstly, unimportant attributes are eliminated using RST generating minimal subset of attributes, called reducts. Considering each core attribute as root of a decision tree, classification rules are built and grouped based on some similarity measure. Representative of each group constitute the new rule set and thus rules has been reduced while important information are retained. D-S theory ensembles the rules from which a classifier with highest accuracy has been selected.

Asit Kumar Das; Jaya Sil

2010-01-01T23:59:59.000Z

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.


441

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

SciTech Connect (OSTI)

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

442

Investigating surface roughness, material removal rate and corrosion resistance in PMEDM of ?-TiAl intermetallic  

Science Journals Connector (OSTI)

Titanium aluminide intermetallics offer an attractive combination of low density and good oxidation, corrosion and ignition resistance with unique mechanical properties. In this study two series of machining tests are designed. Firstly the powder mixed electrical discharge machining (PMEDM) of ?-TiAl by means of different powders such as aluminum, chrome, silicon carbide, graphite and iron is performed to investigate the output characteristics of surface roughness and topography, material removal rate (MRR), electrochemical corrosion resistance of machined samples and also the machined surfaces are investigated by means of EDS and XRD analyses. Secondly after selection the aluminum powder as the most appropriate kind of powder, the current, pulse on time, powder size and powder concentration are changed in different levels for overall comparison between EDM and PMEDM output characteristics. In the first setting of input machining parameters, aluminum powder improves the surface roughness of TiAl sample about 32% comparing with EDM case and also aluminum particles with the size of 2?m, in the second setting of input parameters lead to 54% enhancement of MRR comparing with EDM case. The electrochemical corrosion results show that, corrosion resistance of the samples which are machined by graphite and chrome powders respectively are about three and two times more than the sample which is machined without powder.

Behzad Jabbaripour; Mohammad Hossein Sadeghi; Mohammad Reza Shabgard; Hossein Faraji

2013-01-01T23:59:59.000Z

443

Entropy based unsupervised Feature Selection in digital mammogram image using rough set theory  

Science Journals Connector (OSTI)

Feature Selection (FS) is a process, which attempts to select features, which are more informative. In the supervised FS methods various feature subsets are evaluated using an evaluation function or metric to select only those features, which are related to the decision classes of the data under consideration. However, for many data mining applications, decision class labels are often unknown or incomplete, thus indicating the significance of unsupervised FS. However, in unsupervised learning, decision class labels are not provided. The problem is that not all features are important. Some of the features may be redundant, and others may be irrelevant and noisy. In this paper, a novel unsupervised FS in mammogram image, using rough set-based entropy measures, is proposed. A typical mammogram image processing system generally consists of mammogram image acquisition, pre-processing of image, segmentation, features extracted from the segmented mammogram image. The proposed method is used to select features from data set, the method is compared with the existing rough set-based supervised FS methods and classification performance of both methods are recorded and demonstrates the efficiency of the method.

C. Velayutham; K. Thangavel

2012-01-01T23:59:59.000Z

444

Gene selection using rough set based on neighborhood for the analysis of plant stress response  

Science Journals Connector (OSTI)

Abstract Gene selection and sample classification based on gene expression data are important research trends in bioinformatics. It is very difficult to select significant genes closely related to classification because of the high dimension and small sample size of gene expression data. Rough set based on neighborhood has been successfully applied to gene selection, as it selects attributes without redundancy and deals with numerical attributes directly. Construction of neighborhoods, approximation operators and attribute reduction algorithm are three key components in this gene selection approach. In this study, a novel neighborhood named intersection neighborhood for numerical data was defined. The performances of two kinds of approximation operators were compared on gene expression data. A significant gene selection algorithm, which was applied to the analysis of plant stress response, was proposed by using positive region and gene ranking, and then this algorithm with thresholds optimization for intersection neighborhood was extended. The performance of the proposed algorithm, along with a comparison with other related methods, classical algorithms and rough set methods, was analyzed. The results of experiments on four data sets showed that intersection neighborhood was more flexible to adapt to the data with various structure, and approximation operator based on elementary set was more suitable for this application than that based on element. That was to say that the proposed algorithms were effective, as they could select significant gene subsets without redundancy and achieve high classification accuracy.

Jun Meng; Jing Zhang; Rui Li; Yushi Luan

2014-01-01T23:59:59.000Z

445

Precision coupling system modelling based on rough set and support vector machine  

Science Journals Connector (OSTI)

This paper presents the results of a research into the use of rough set (RS) for the precision coupling system modelling based on support vector machine (SVM). Because of the impact of multiple geometric parameters, there are more input variables in the precision coupling system modelling process. The high-dimensional data poses an interesting challenge to machine learning, as the presence of large numbers of redundant or highly correlated variables can seriously degrade modelling accuracy. In this study, a modelling method was developed based on rough set and support vector machine for precision coupling system. We used RS as the pre-processor for precision coupling system modelling, so as to realise dimension reduction of the high-dimensional data and improve the predictive performance of machine learning method, and then SVM was used for precision coupling system modelling. Experiments were carried out on a typical precision coupling, hydraulic valve. The results show that the use of RS method can improve the performance of machine learning in the modelling of high-dimensional data.

Jian-wei Ma; Fu-ji Wang; Zhen-yuan Jia; Wei Liu

2013-01-01T23:59:59.000Z

446

Feature selection for transient stability assessment based on kernelized fuzzy rough sets and memetic algorithm  

Science Journals Connector (OSTI)

Abstract A new feature selection method based on kernelized fuzzy rough sets (KFRS) and the memetic algorithm (MA) is proposed for transient stability assessment of power systems. Considering the possible real-time information provided by wide-area measurement systems, a group of system-level classification features are extracted from the power system operation parameters to build the original feature set. By defining a KFRS-based generalized classification function as the separability criterion, the memetic algorithm based on binary differential evolution (BDE) and Tabu search (TS) is employed to obtain the optimal feature subsets with the maximized classification capability. The proposed method may avoid the information loss caused by the feature discretization process of the rough-set based attribute selection, and comprehensively utilize the advantages of BDE and TS to improve the solution quality and search efficiency. The effectiveness of the proposed method is validated by the application results on the New England 39-bus power system and the southern power system of Hebei province.

Xueping Gu; Yang Li; Jinghua Jia

2015-01-01T23:59:59.000Z

447

Effect of nanoscale surface roughness on the bonding energy of direct-bonded silicon wafers  

Science Journals Connector (OSTI)

Direct wafer bonding of silicon wafers is a promising technology for manufacturing three-dimensional complex microelectromechanical systems as well as silicon-on-insulator substrates. Previous work has reported that the bond quality declines with increasing surface roughness however this relationship has not been quantified. This article explicitly correlates the bond quality which is quantified by the apparent bonding energy and the surface morphology via the bearing ratio which describes the area of surface lying above a given depth. The apparent bonding energy is considered to be proportional to the real area of contact. The effective area of contact is defined as the area sufficiently close to contribute to the attractive force between the two bonding wafers. Experiments were conducted with silicon wafers whose surfaces were roughened by a buffered oxide etch solution (BOE HF:NH 4 F =1:7) and/or a potassium hydroxide solution. The surface roughness was measured by atomic force microscopy. The wafers were direct bonded to polished monitor wafers following a standard RCA cleaning and the resulting bonding energy was measured by the crack-opening method. The experimental results revealed a clear correlation between the bonding energy and the bearing ratio. A bearing depth of ?1.4 nm was found to be appropriate for the characterization of direct-bonded silicon at room temperature which is consistent with the thickness of the water layer at the interface responsible for the hydrogen bonds that link the mating wafers.

N. Miki; S. M. Spearing

2003-01-01T23:59:59.000Z

448

Optical measurement of the rms (root-mean-square) roughness of ion-bombarded surfaces. Final report, 1986-1987  

SciTech Connect (OSTI)

Ion-implantation and related ion-beam-processing techniques are used to modify the surface of materials and produce certain desirable properties. However, these methods sometimes roughen the surfaces to which they are applied. If undetected, such roughness can lead to erroneous interpretation of data gathered by most standard surface-analysis techniques. Many surface profilometers and scanning electron microscopes lack sufficient spatial resolution to detect fine-scale roughness that can complicate the data interpretation. A simple optical instrument was constructed to measure the root-mean-square (rms) roughness, below about 100 nm, of ion bombarded surfaces. This instrument measures the total integrated scatter (TIS) of almost normally incident laser light, which (under conditions specified by scalar scattering (theory)) is simply related to the rms surface roughness. This paper describes the construction and calibration of the TIS instrument. In addition, it presents results on the rms roughness of several ion-beam-processed systems, including TiN films on Si and Cr and Cr/sub 2/O/sub 3/ films on AISI 52100 steel, ion beam mixed Mo in Al, Si(x)N(1-x) refractive layers, and GaAs/AlAs superlattices.

Ferguson, C.D.

1987-05-19T23:59:59.000Z

449

Improved detection of rough defects for ultrasonic NDE inspections based on finite element modeling of elastic wave scattering  

SciTech Connect (OSTI)

Defects which posses rough surfaces greatly affect ultrasonic wave scattering behaviour, often reducing the magnitude of reflected signals. Ultrasonic inspections rely upon this response for detecting and sizing flaws. For safety critical components reliable characterisation is crucial. Therefore, providing an accurate means to predict reductions in signal amplitude is essential. An extension of Kirchhoff theory has formed the basis for the UK power industry inspection justifications. However, it is widely recognised that these predictions are pessimistic owing to analytical approximations. A numerical full field modelling approach does not fall victim to such limitations. Here, a Finite Element model is used to aid in setting a non-conservative reporting threshold during the inspection of a large pressure vessel forging that might contain embedded rough defects. The ultrasonic response from multiple rough surfaces defined by the same statistical class is calculated for normal incident compression waves. The approach is validated by comparing coherent scattering with predictions made by Kirchhoff theory. At lower levels of roughness excellent agreement is observed, whilst higher values confirm the pessimism of Kirchhoff theory. Furthermore, the mean amplitude in the specular direction is calculated. This represents the information obtained during an inspection, indicating that reductions due to increasing roughness are significantly less than the coherent component currently being used.

Pettit, J. R. [Rolls-Royce Nuclear, PO BOX 2000, Derby, UK, DE21 7XX and Research Centre for NDE, Imperial College London, Exhibition Road, London SW7 2AZ (United Kingdom); Walker, A. [Rolls-Royce Nuclear, PO BOX 2000, Derby DE21 7XX (United Kingdom); Lowe, M. J. S. [Research Centre for NDE, Imperial College London, Exhibition Road, London SW7 2AZ (United Kingdom)

2014-02-18T23:59:59.000Z

450

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

451

A knowledge discovery from incomplete coronary artery disease datasets using rough set  

Science Journals Connector (OSTI)

Incompleteness of datasets is one of the important issues in the area of knowledge discovery in medicine. This study proposes a rough set theory (RST)-based knowledge discovery from coronary artery disease (CAD) datasets when there are only small number of objects and contain missing data (incomplete). At first, RST combined with artificial neural network (ANN) is developed to impute the missing data of the datasets. Then, the knowledge that is discovered from imputed datasets is used to evaluate the quality of the imputation. After that, RST is applied to extract rules from the imputed datasets. This will result in a large number of rules. Rule selection based on the quality of extracted rules is investigated. All the evaluation and selection are based on the complete datasets. Finally, the selected small number of rules is evaluated. The discovered selected rules are used as a classifier on the diagnosis of the presence of CAD to demonstrate their good performance.

Noor Akhmad Setiawan; P.A. Venkatachalam; M.H. Ahmad Fadzil

2011-01-01T23:59:59.000Z

452

Unsupervised feature selection using rough set and teaching learning-based optimisation  

Science Journals Connector (OSTI)

Feature selection is a valuable technique in data analysis for information preserving data reduction. This paper proposes to consider an information system without any decision attribute. The proposal is useful when we get unlabeled data, which contains only input information (condition attributes) but without decision (class attribute). TLBO clustering algorithm is applied to cluster the given information. Decision table could be formulated using this clustered data as the decision variable. Then rough set and TLBO algorithms are applied for selecting features. The experiments are carried out on datasets of UCI machine repository and from the website http://www.ailab.si/orange/datasets.asp to analyse the performance study of our proposed approach with other approaches like genetic algorithm, particle swarm optimisation and differential evolution techniques. The results clearly reveal that our proposed approach outperforms other approaches investigated in this paper.

Suresh Chandra Satapathy; Anima Naik; K. Parvathi

2013-01-01T23:59:59.000Z

453

Broadcast Baits for Fire Ant Control  

E-Print Network [OSTI]

recommended for accurate calibration as is the block- ing plate that covers two of the four gate openings. For very large areas, rough or wooded/brushy terrain Type: Aerial application Cost: $2.50 to $4 per acre, application only Brand name: Local certifi ed... aerial applicator Bait distribution: Excellent and fast, but drift may be severe in crosswinds Rate accuracy: Excellent, if calibrated and applied properly Comments: Modifying aircraft to apply bait is simple and inexpensive. For details, see the Web...

Barr, Charles L.

2005-10-17T23:59:59.000Z

454

Enhancement of MahalanobisTaguchi System via Rough Sets based Feature Selection  

Science Journals Connector (OSTI)

Abstract The current research presents a methodology for classification based on Mahalanobis Distance (MD) and Association Mining using Rough Sets Theory (RST). MD has been used in Mahalanobis Taguchi System (MTS) to develop classification scheme for systems having dichotomous states or categories. In MTS, selection of important features or variables to improve classification accuracy is done using Signal-to-Noise (S/N) ratios and Orthogonal Arrays (OAs). \\{OAs\\} has been reviewed for limitations in handling large number of variables. Secondly, penalty for over-fitting or regularization is not included in the feature selection process for the MTS classifier. Besides, there is scope to enhance the utility of MTS to a classification-cum-causality analysis method by adding comprehensive information about the underlying process which generated the data. This paper proposes to select variables based on maximization of degree-of-dependency between Subset of System Variables (SSVs) and system classes or categories (R). Degree-of-dependency, which reflects goodness-of-model and hence goodness of the SSV, is measured by conditional probability of system states on subset of variables. Moreover, a suitable regularization factor equivalent to L0 norm is introduced in an optimization problem which jointly maximizes goodness-of-model and effect of regularization. Dependency between \\{SSVs\\} and R is modeled via the equivalent sets of Rough Set Theory. Two new variants of MTS classifier are developed and their performance in terms of accuracy of classification is evaluated on test datasets from five case studies. The proposed variants of MTS are observed to be performing better than existing MTS methods and other classification techniques found in literature.

Ashif Sikandar Iquebal; Avishek Pal; Darek Ceglarek; Manoj Kumar Tiwari

2014-01-01T23:59:59.000Z

455

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

E-Print Network [OSTI]

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

Shnapp, Ron

2014-01-01T23:59:59.000Z

456

Numerical modelling of a magnetic fluid-based squeeze film between rotating transversely rough curved circular plates  

Science Journals Connector (OSTI)

An attempt has been made to analyse the behaviour of a magnetic fluid-based squeeze film between two curved rough rotating circular plates when the curved upper plate lying along a surface determined by hyperbolic function approaches the curved lower plate along the surface governed by a secant function. The concerned Reynolds equation is solved with appropriate boundary conditions in dimensionless form to get the pressure distribution. The results show that the bearing system records a considerably enhanced performance as compared to that of the bearing system working with a conventional lubricant. This investigation suggests that although the bearing suffers owing to transverse roughness in general, there are some scopes for getting a relatively better performance in the case of negatively skewed roughness by properly choosing curvature parameters and the rotation ratio. Interestingly enough this positive effect further enhances especially when negative variance is involved.

G.M. Deheri; Nikhilkumar Abhangi

2011-01-01T23:59:59.000Z

457

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.

458

Combined short scale roughness and surface dielectric function gradient effects on the determination of tip-sample force in atomic force microscopy  

SciTech Connect (OSTI)

The contribution of tip roughness to the van der Waals force between an atomic force microscopy probe tip and the sample is calculated using the multilayer effective medium model, which allows us to consider the relevant case of roughness characterized by correlation length and amplitude in the nanometer scale. The effect of the surface dielectric function gradient is incorporated in the tip-sample force model. It is concluded that for rms roughness in the few nanometers range the effect of short scale tip roughness is quite significant.

Gusso, Andr, E-mail: gusso@metal.eeimvr.uff.br [Departamento de Cincias Exatas-EEIMVR, Universidade Federal Fluminense, Volta Redonda, RJ 27255-125 (Brazil)] [Departamento de Cincias Exatas-EEIMVR, Universidade Federal Fluminense, Volta Redonda, RJ 27255-125 (Brazil)

2013-11-11T23:59:59.000Z

459

Vibrant fault diagnosis for hydroelectric generator units with a new combination of rough sets and support vector machine  

Science Journals Connector (OSTI)

The fault diagnosis for hydroelectric generator unit (HGU) is significant to prevent dangerous accidents from occurring and to improve economic efficiency. The faults of HGU involve overlapping fault patterns which may denote a kind of faults in the ... Keywords: Fault diagnosis, Hydroelectric generator unit, Rough sets, Support vector machine

Xiaoyuan Zhang; Jianzhong Zhou; Jun Guo; Qiang Zou; Zhiwei Huang

2012-02-01T23:59:59.000Z

460

Variation of urban momentum roughness length with land use in the upwind source area, as observed in two UK cities.  

E-Print Network [OSTI]

in two UK cities. G.G.Rooney (gabriel.rooney@metoffice.com), I.D.Longley and J.F.Barlow Met Office Field fraction of different cover types, Birmingham 20 4 roughness lengths against wind direction, Salford 21 5 in building wakes to its blended final state at some height above the urban canopy, for a real city, tests

Reading, University of

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461

Shliomis model-based magnetic squeeze film in rotating rough curved circular plates: a comparison of two different porous structures  

Science Journals Connector (OSTI)

This study aims to analyse the effect of different porous structures on the performance of a Shliomis model-based magnetic squeeze film in rotating rough porous curved circular plates. For porous structures Kozeny-Carman's formulation and Irmay's model have been adopted. A Shliomis model-based magnetic fluid flow is considered. The stochastically averaging models of Christensen and Tonder have been used for characterising the effect of transverse roughness. The associated stochastically averaged Reynolds type equation is solved to obtain the pressure distribution leading to the calculation of the load carrying capacity. The results presented in graphical form show that the adverse effect of transverse roughness can be compensated by the positive effect of magnetisation in the case of negatively skewed roughness, suitably choosing the rotation ratio and the curvature parameters. Further, this compensation appears to be more in the case of Kozeny-Carman's formulation as compared to that of Irmay's model, which makes the Kozeny-Carman's model a superior choice.

Jimit R. Patel; Gunamani Deheri

2014-01-01T23:59:59.000Z

462

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

SciTech Connect (OSTI)

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

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

2014-11-01T23:59:59.000Z

463

A classification approach for less popular webpages based on latent semantic analysis and rough set model  

Science Journals Connector (OSTI)

Abstract Nowadays, with the explosive growth of web information, the webpage classification faces great challenge. Computers have difficulty in understanding the semantic meaning of textual or non-textual webpages. Fortunately, Web 2.0 based collaborative tagging system brings new opportunities to solve this problem. It abstracts structured tags from unstructured content in webpages. However, large numbers of webpages on the Internet are less popular. Their tagging information is sparse, which makes their topic unclear and leads to ambiguous classification. Illuminated by the ambiguous classification, we name the less popular webpage hesitant webpage. In this paper, we propose an advanced approach for hesitant webpages classification. Firstly, hesitant webpages are divided into bridges, hubs and attached webpages according to their roles on the Internet. Secondly, attached webpages are classified by mining and extending their information in two perspectives. One is the latent semantic analysis (LSA) which is applied to fully explore the semantic meaning of sparse tags. It promotes accurate cognition of webpages semantically close to attached webpages. Another is the proposed density-relation-based rough set model which measures the affiliation degree of attached webpages in different categories. Experiment on real data shows that our approach effectively classifies the hesitant webpages base on the semantic meaning.

Jun Wang; Jiaxu Peng; Ou Liu

2015-01-01T23:59:59.000Z

464

Robust Ordinal Regression for Dominance-based Rough Set Approach to multiple criteria sorting  

Science Journals Connector (OSTI)

Abstract We present a new multiple criteria sorting method deriving from Dominance-based Rough Set Approach (DRSA). The preference information supplied by the Decision Maker (DM) is a set of possibly imprecise and inconsistent assignment examples on a subset of reference alternatives relatively well-known to the DM. To structure the data we use DRSA, and subsequently, represent the assignment examples by all minimal sets of rules covering all alternatives from the lower approximations of class unions. Such a set of rules is called minimal-cover set it is one of the instances of the preference model compatible with DMs preference information. In this way, we implement the principle of Robust Ordinal Regression (ROR) to decision rule preference model. For each alternative, we derive the necessary and possible assignments specifying the range of classes to which the alternative is assigned by all or at least one compatible set of rules, respectively, as well as class acceptability indices. We also introduce the notion of a representative compatible minimal-cover set of rules whose selection builds on the results of ROR, addressing the robustness concern. Application of the approach is demonstrated by classifying 69 land zones in 4 classes representing different risk levels.

Mi?osz Kadzi?ski; Salvatore Greco; Roman S?owi?ski

2014-01-01T23:59:59.000Z

465

Incremental feature selection based on rough set in dynamic incomplete data  

Science Journals Connector (OSTI)

Abstract Feature selection plays a vital role in many areas of pattern recognition and data mining. The effective computation of feature selection is important for improving the classification performance. In rough set theory, many feature selection algorithms have been proposed to process static incomplete data. However, feature values in an incomplete data set may vary dynamically in real-world applications. For such dynamic incomplete data, a classic (non-incremental) approach of feature selection is usually computationally time-consuming. To overcome this disadvantage, we propose an incremental approach for feature selection, which can accelerate the feature selection process in dynamic incomplete data. We firstly employ an incremental manner to compute the new positive region when feature values with respect to an object set vary dynamically. Based on the calculated positive region, two efficient incremental feature selection algorithms are developed respectively for single object and multiple objects with varying feature values. Then we conduct a series of experiments with 12 UCI real data sets to evaluate the efficiency and effectiveness of our proposed algorithms. The experimental results show that the proposed algorithms compare favorably with that of applying the existing non-incremental methods.

Wenhao Shu; Hong Shen

2014-01-01T23:59:59.000Z

466

Engineering Application Way of Faults Knowledge Discovery Based on Rough Set Theory  

Science Journals Connector (OSTI)

For the knowledge acquisition puzzle of intelligence decision-making technology in mechanical industry, to use the Rough Set Theory (RST) as a kind of tool to solve the puzzle was researched. And the way to realize the knowledge discovery in engineering application is explored. A case extracting out the knowledge rules from a concise data table shows out some important information. It is that the knowledge discovery similar to the mechanical faults diagnosis is an item of complicated system engineering project. In where, first of all-important tasks is to preserve the faults knowledge into a table with data mode. And the data must be derived from the plant site and should also be as concise as possible. On the basis of the faults knowledge data obtained so, the methods and algorithms to process the data and extract the knowledge rules from them by means of RST can be processed only. The conclusion is that the faults knowledge discovery by the way is a process of rising upward. But to develop the advanced faults diagnosis technology by the way is a large-scale knowledge engineering project for long time. Every step in which should be designed seriously according to the tool's demands firstly. This is the basic guarantees to make the knowledge rules obtained have the values of engineering application and the studies have scientific significance. So, a general framework is designed for engineering application to go along the route developing the faults knowledge discovery technology.

Zhao Rongzhen; Li Chao; Dneg Linfeng

2011-01-01T23:59:59.000Z

467

MMeR: an algorithm for clustering heterogeneous data using rough set theory  

Science Journals Connector (OSTI)

Several cluster analysis techniques have been developed so far to group objects having similar characteristics. Clustering of categorical data is more challenging than that of numerical data. Most of the early cluster analysis techniques face problems due to the fact that much of the data contained in today's databases is categorical in nature. This necessitated the development of some algorithms for clustering categorical data. Uncertainty is an integral part of databases. The algorithms put forth either lack the capability to handle uncertainty or do not reach a steady state in a few iterations, which gives rise to the stability issues. Recently, an algorithm, termed MMR was proposed (Parmar et al., 2007), which uses the rough set theory to deal with the above problems in clustering categorical data. In this paper, we modified MMR to develop an improved algorithm and call it MMeR. This takes care of both numerical and categorical data simultaneously besides handling uncertainty. Also, this new algorithm provides much better performance than most of the existing algorithms including MMR. Some well known data sets are taken to test and illustrate the superiority of MMeR over most of the existing algorithms.

Prakash Kumar; B.K. Tripathy

2009-01-01T23:59:59.000Z

468

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

E-Print Network [OSTI]

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

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

2014-06-24T23:59:59.000Z

469

Effect of Surface Roughness of Steels on Oxide Layer Formation in a Liquid Lead-Bismuth Flow  

SciTech Connect (OSTI)

Self-healed oxide layer formation on steel surfaces in liquid lead bismuth (Pb-Bi) may be effective to improve the compatibility problem for the development of the Pb-Bi cooled FBR and the ADS with a PB-Bi target. The growth, stability and property of the oxide layer may depend on the roughness of the substrate surface. The effect of convex part and dent part of the steel surfaces on the property of the oxide layer in a Pb-Bi flow was investigated for the steels which had the surface of smooth, rough and their middle roughness. The steels were exposed into a Pb- Bi flow at the temperature of 550 deg. C, the temperature difference of 150 deg. C, the flow velocity of 1 m/s and the oxygen concentration of 1.7x10{sup -8} wt% for 500 and 1,000 hours. The results showed that the initial surface roughness influenced on the oxide layer formation during the exposure. The oxide layer was cracked at the convex part of the surface. On the contrary, few cracks existed and the oxide layer remained at the dent part. That indicated thickened oxide layer caused stress due to the oxide growth, and the stress concentrated at the convex part. Few cracks appeared in a compact oxide layer which was formed on the rough surface of 9Cr steel and detached from the substrate. This was possibly caused by the stop of oxide layer growth since a metal element was not supplied from the substrate. (authors)

KONDO, Masatoshi [Tokyo Institute of Technology, Department of Nuclear Engineering 2-12-1, O-okayama, Meguro-ku, Tokyo, 152-8550 (Japan); TAKAHASHI, Minoru [Tokyo Institute of Technology, Research Laboratory for Nuclear Reactors, 2-12-1, O-okayama, Meguro-ku, Tokyo, 152-8550 (Japan); YOSHIDA, Susumu [Tokyo Institute of Technology, Research Laboratory for Nuclear Reactors, 2-12-1, O-okayama, Meguro-ku, Tokyo, 152-8550 (Japan); SAWADA, Naoki [Tokyo Institute of Technology, Research Laboratory for Nuclear Reactors, 2-12-1, O-okayama, Meguro-ku, Tokyo, 152-8550 (Japan)

2004-07-01T23:59:59.000Z

470

Effects of grit roughness and pitch oscillations on the S810 airfoil  

SciTech Connect (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

471

Effects of grit roughness and pitch oscillations on the NACA 4415 airfoil  

SciTech Connect (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

472

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

E-Print Network [OSTI]

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

473

Nocturnal Flow on a Western Colorado Slope  

Science Journals Connector (OSTI)

The Department of Energy sponsored Atmospheric Studies in Complex Terrain (ASCOT) program has conducted a research program designed to increase our knowledge and understanding of terrain-dominated flows with spec...

John M. Leone Jr.; Paul H. Gudiksen

1991-01-01T23:59:59.000Z

474

Tandem mobile robot system  

SciTech Connect (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

475

A Multiscale and Multidisciplinary Investigation Of EcosystemAtmosphere CO2 Exchange Over the Rocky Mountains of Colorado  

Science Journals Connector (OSTI)

A significant fraction of Earth consists of mountainous terrain. However, the question of how to monitor the surfaceatmosphere 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

476

E-Print Network 3.0 - automated military unit Sample Search Results  

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

and tools... .574.5700 | 310.574.5752 fax | info@ict.usc.edu Military Terrain for Games Pipeline 4.11 Commercial gaming... generated military terrain for use in virtual training...

477

A rough set-based effective rule generation method for classification with an application in intrusion detection  

Science Journals Connector (OSTI)

In this paper, we use Rough Set Theory (RST) to address the important problem of generating decision rules for data mining. In particular, we propose a rough set-based approach to mine rules from inconsistent data. It computes the lower and upper approximations for each concept, and then builds concise classification rules for each concept satisfying required classification accuracy. Estimating lower and upper approximations substantially reduces the computational complexity of the algorithm. We use UCI ML Repository data sets to test and validate the approach. We also use our approach on network intrusion data sets captured using our local network from network flows. The results show that our approach produces effective and minimal rules and provides satisfactory accuracy.

Prasanta Gogoi; Dhruba K. Bhattacharyya; Jugal K. Kalita

2013-01-01T23:59:59.000Z

478

Generating an indicator for pump impeller damage using half and full spectra, fuzzy preference-based rough sets and PCA  

Science Journals Connector (OSTI)

Parameters that vary monotonically with damage propagation are useful in condition monitoring. However, it is not easy to find such parameters especially for complex systems like pumps. A method using half and full spectra, fuzzy preference-based rough sets and principal component analysis (PCA) is proposed to generate such an indicator for tracking impeller damage in a centrifugal slurry pump. Half and full spectra are used for extracting features related to pump health status. A fuzzy preference-based rough set model is employed in the process of selecting features reflecting the damage propagation monotonically. PCA is used to condense the features and generate an indicator which represents the damage propagation. The effectiveness of the proposed method is tested using laboratory experimental data. Results show that the indicator generated by the proposed method can clearly and monotonically distinguish the health status of the pump impeller.

Xiaomin Zhao; Ming J Zuo; Tejas H Patel

2012-01-01T23:59:59.000Z

479

A strategy to reduce flooding in grid Fisheye State routing (GFSR) protocol with weighted rough set model using MANET  

Science Journals Connector (OSTI)

A mobile ad hoc networks consist of wireless hosts that may move often. Movement of host results to changes in path. The well-known Fisheye State Routing (FSR) protocol determines a route when no route exists or route breaks. To establish new path from source to destination, it broadcast control packets (route request packets), which increases the network bandwidth consumption and to reduce flooding. As mobile ad hoc networks have limited bandwidth, it is important to reduce the flooding. This paper provides a protocol which uses the weighted rough set model to control the route request packets in the existing FSR protocol in GRID. Weighted rough set theory is a mathematical tool to deal with vagueness, uncertainty and it also considers the importance of the objects (nodes).

S. Nithya Rekha; C. Chandrasekar

2012-01-01T23:59:59.000Z

480

An intelligent oil reservoir identification approach by deploying quantum Levenberg-Marquardt neural network and rough set  

Science Journals Connector (OSTI)

An intelligent identification approach combining the features of parallel computation of quantum Levenberg-Marquardt neural network (Q-LM-NN) and information reduct of rough set is proposed as an improved alternative to common statistical identification methods and single-intelligent-based methods which are unable to attain satisfactory result in engineering applications. This approach has been tested to have better performance on reducing the cost and improving the identification accuracy than other methods in practical oil log applications.

Nanping Liu; Fei Zheng; Kewen Xia

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.


481

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

E-Print Network [OSTI]

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

Pollefeys, Marc

482

Comprehensive Monitoring of Wildlife Mortality on British Columbia Highways Using the WARS System (1978 to 2005)  

E-Print Network [OSTI]

wildlife signs, fencing, under/overpasses, reflectors elevation, cliffs, slopes, plains, undulating terrain rain, snow, sleet, fog, haze, smoke, wind,

Sielecki, Leonard E.

2005-01-01T23:59:59.000Z

483

Shingo Shimoda Unit leader  

E-Print Network [OSTI]

terrain using potential fields", Robotica, Vol.25, pp.409-424, 2007 [6] Shingo Shimoda, Takashi Kubota

Kazama, Hokto

484

Development of Legged, Wheeled, and Hybrid Rover Mobility Models to Facilitate Planetary Surface  

E-Print Network [OSTI]

that wheeled mobility is best suited for flat and level terrain, and legged mobility is best suited for rocky

485

Surface smoothing effect of an amorphous thin film deposited by atomic layer deposition on a surface with nano-sized roughness  

SciTech Connect (OSTI)

Previously, Lau (one of the authors) pointed out that the deposition of an amorphous thin film by atomic layer deposition (ALD) on a substrate with nano-sized roughness probably has a surface smoothing effect. In this letter, polycrystalline zinc oxide deposited by ALD onto a smooth substrate was used as a substrate with nano-sized roughness. Atomic force microscopy (AFM) and cross-sectional transmission electron microscopy (XTEM) were used to demonstrate that an amorphous aluminum oxide thin film deposited by ALD can reduce the surface roughness of a polycrystalline zinc oxide coated substrate.

Lau, W. S., E-mail: liuweicheng@zju.edu.cn; Wan, X.; Xu, Y.; Wong, H. [Zhejiang University, Department of Information Science and Electronic Engineering, No. 38 Zheda Road, Hangzhou 310027 (China)] [Zhejiang University, Department of Information Science and Electronic Engineering, No. 38 Zheda Road, Hangzhou 310027 (China); Zhang, J. [Zhejiang University, Department of Materials Science and Engineering, No. 38 Zheda Road, Hangzhou 310027 (China)] [Zhejiang University, Department of Materials Science and Engineering, No. 38 Zheda Road, Hangzhou 310027 (China); Luo, J. K. [Zhejiang University, Department of Information Science and Electronic Engineering, No. 38 Zheda Road, Hangzhou 310027 (China) [Zhejiang University, Department of Information Science and Electronic Engineering, No. 38 Zheda Road, Hangzhou 310027 (China); Institute of Renewable Energy and Environment Technology, Bolton University, Deane Road, Bolton BL3 5 AB (United Kingdom)

2014-02-15T23:59:59.000Z

486

The new race to the Moon  

Science Journals Connector (OSTI)

......Team Puli has focused on tackling the bumpy and rocky lunar terrain. We're planning to land our...terrain expected on the Moon (figure 2). For flat terrain, wheels are superior, but on rocky, steep and uneven ground, legs are better......

Sue Bowler

2014-10-01T23:59:59.000Z

487

The Effect of Inaccuracies in Weather-Ship Data on Bulk-Derived Estimates of Flux, Stability and Sea-Surface Roughness  

Science Journals Connector (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

488

A Global Climatology of Albedo, Roughness Length and Stomatal Resistance for Atmospheric General Circulation Models as Represented by the Simple Biosphere Model (SiB)  

Science Journals Connector (OSTI)

Components of the Simple Biosphere Model (SiB) of Sellers et al. were used to generate global monthly fields of surface albedo (0.44.0 ?m), roughness length and minimum surface (stomatal) resistance.

J. L. Dorman; P. J. Sellers

1989-09-01T23:59:59.000Z

489

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

E-Print Network [OSTI]

Abstract D etailed m odeling ofreactive flow s th rough geologicm edia is necessary to understand porous m edia. PFLOTRAN is built on top of th e PETSc parallelscientific toolk it and uses its efficient

Mills, Richard

490

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.

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

1999-01-01T23:59:59.000Z

491

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

492

On the elastic energy and stress correlation in the contact between elastic solids with randomly rough surfaces  

E-Print Network [OSTI]

When two elastic solids with randomly rough surfaces are brought in contact, a very inhomogeneous stress distribution sigma(x) will occur at the interface. Here I study the elastic energy and the correlation function , where sigma(q) is the Fourier transform of sigma(x) and where stands for ensemble average. I relate to the elastic energy stored at the interface, and I show that for self affine fractal surfaces, quite generally \\sim q^{-(1+H)}, where H is the Hurst exponent of the self-affine fractal surface.

B. N. J. Persson

2008-05-06T23:59:59.000Z

493

Frequency-Rank Correlations of Rhodopsin Mutations with Tuned Hydropathic Roughness Based on Self-Organized Criticality  

E-Print Network [OSTI]

The behavior of disease-linked mutations of membrane proteins is especially simple in rhodopsin, where they are well-studied, as they are responsible for retinitis pigmentosa, RP (retinal degeneration). Here we show that the frequency of occurrence of single RP mutations is strongly influenced by their posttranslational survival rates, and that this survival correlates well (82%) with a long-range, non-local hydropathic measure of the roughness of the water interfaces of ex-membrane rhodopsin based on self-organized criticality (SOC). It is speculated that this concept may be generally useful in studying survival rates of many mutated proteins.

J. C. Phillips

2012-01-05T23:59:59.000Z

494

Combing rough set and RBF neural network for large-scale ship recognition in optical satellite images  

Science Journals Connector (OSTI)

Large scale ship recognition in optical remote sensing images is of great importance for many military applications. It aims to recognize the category information of the detected ships for effective maritime surveillance. The contributions of the paper can be summarized as follows: Firstly, based on the rough set theory, the common discernibility degree is used to compute the significance weight of each candidate feature and select valid recognition features automatically; Secondly, RBF neural network is constructed based on the selected recognition features. Experiments on recorded optical satellite images show the proposed method is effective and can get better classification rates at a higher speed than the state of the art methods.

Lu Chunyan; Zou Huanxin; Sun Hao; Zhou Shilin

2014-01-01T23:59:59.000Z

495

Use of a temporal approach to the three-dimensional image formation of a distant rough nonplanar object  

SciTech Connect (OSTI)

A method is proposed to reconstruct three-dimensional images of a distant nonplanar rough object by the speckle pattern of its flat image, which is calculated using the temporal approach based on the time correlation function of probe radiation with a coherence length smaller than the size of the probed object. We analyse the influence of the angular resolution of the optical system, forming an image of the object, and additive noises on the reconstruction accuracy of the object surface shape using the proposed method. (imaging)

Mandrosov, V I [Moscow Institute of Physics and Technology (State University), Dolgoprudnyi, Moscow Region (Russian Federation)

2011-02-28T23:59:59.000Z

496

Incremental update of approximations in dominance-based rough sets approach under the variation of attribute values  

Science Journals Connector (OSTI)

Abstract Dominance-based Rough Sets Approach (DRSA) has received much attention since it is able to acquire knowledge from information with preference ordered attribute domains and decision classes. In many real-life applications, the information systems may evolve over time dynamically. In a dynamic information system, the obtained knowledge, e.g., approximations in DRSA, need to be updated for decision making and other related tasks. As a useful technique, the incremental update can be applied to process dynamic information with revising the obtained knowledge. In this paper, we propose an incremental approach for maintaining approximations of DRSA when attribute values vary over time. Some numerical examples illustrate that the incremental approach can renew approximations of DRSA without beginning from scratch. Experimental evaluations show that the incremental algorithm can effectively reduce the computational time in comparison with the non-incremental one when the ratio of the attribute values varied is less than a threshold.

Shaoyong Li; Tianrui Li

2015-01-01T23:59:59.000Z

497

Discrepancy between Subcritical and Fast Rupture Roughness: A Cumulant Analysis N. Mallick, P.-P. Cortet, S. Santucci,* S. G. Roux, and L. Vanel  

E-Print Network [OSTI]

Discrepancy between Subcritical and Fast Rupture Roughness: A Cumulant Analysis N. Mallick, P the slow (subcritical) and the fast growth regime. DOI: 10.1103/PhysRevLett.98.255502 PACS numbers: 62, crack growth starts in a subcritical regime where the growth is slow (v 10ÿ5­10ÿ2 m sÿ1) and reaches

Roux, Stephane

498

Immiscible displacements in rough-walled fractures: Competition between roughening by random aperture variations and smoothing by in-plane curvature  

E-Print Network [OSTI]

Immiscible displacements in rough-walled fractures: Competition between roughening by random-walled fractures is controlled by the competition between random aperture variability which tends to roughen parameters: one that controls roughening the coefficient of variation of the aperture field, and another

Detwiler, Russell

499

Roughness-based monitoring of transparency and conductivity in boron-doped ZnO thin films prepared by spray pyrolysis  

SciTech Connect (OSTI)

Graphical abstract: Display Omitted Highlights: ? We report surface roughness dependent transparency and conductivity in ZnO films. ? The surface roughness with respected to boron doping concentrations is studied. ? Boron doped and pristine Zinc oxide thin films have showed ?95% transmittance. ? Increased carrier concentration of 9.21 10{sup 21} cm{sup ?3} revealed from Hall measurement. -- Abstract: Sprayed polycrystalline ZnO and boron-doped ZnO thin films composed of spherical grains of 2532 nm in diameters are used in roughness measurement and further correlated with the transparency and the conductivity characteristics. The surface roughness is increased up to Zn{sub 0.98}B{sub 0.02}O and then declined at higher boron concentrations. The sprayed ZnO films revealed ?95% transmittance in the visible wavelength range, 1.956 10{sup ?4} ? cm electrical resistivity, 46 cm{sup 2}/V s Hall mobility and 9.21 10{sup 21} cm{sup ?3} charge carrier concentration. The X-ray photoelectron spectroscopy study has confirmed 0.15 eV binding energy change for Zn 2p{sub 3/2} when 2 at% boron content is mixed without altering electro-optical properties substantially. Finally, using soft modeling importance of these textured ZnO over non-textured films for enhancing the solar cells performance is explored.

Gaikwad, Rajendra S. [Clean Energy Research Center, Korea Institute of Science and Technology, Seoul 130-650 (Korea, Republic of) [Clean Energy Research Center, Korea Institute of Science and Technology, Seoul 130-650 (Korea, Republic of); Department of Physics, Yashwantrao Mohite College, Bharati Vidyapeeth Deemed University, Pune 411038, Maharashtra (India); Bhande, Sambhaji S. [Centre for Nanomaterials and Energy Devices, School of Physical Sciences, Swami Ramand Teerth Marathwada University, Nanded (India)] [Centre for Nanomaterials and Energy Devices, School of Physical Sciences, Swami Ramand Teerth Marathwada University, Nanded (India); Mane, Rajaram S., E-mail: rsmane_2000@yahoo.com [Clean Energy Research Center, Korea Institute of Science and Technology, Seoul 130-650 (Korea, Republic of); Inorganic Nanomaterials Laboratory, Department of Chemistry, Hanyang University, Seoul 133-791 (Korea, Republic of); Centre for Nanomaterials and Energy Devices, School of Physical Sciences, Swami Ramand Teerth Marathwada University, Nanded (India); Pawar, Bhagwat N. [Department of Physics, Yashwantrao Mohite College, Bharati Vidyapeeth Deemed University, Pune 411038, Maharashtra (India)] [Department of Physics, Yashwantrao Mohite College, Bharati Vidyapeeth Deemed University, Pune 411038, Maharashtra (India); Gaikwad, Sanjay L. [Centre for Nanomaterials and Energy Devices, School of Physical Sciences, Swami Ramand Teerth Marathwada University, Nanded (India)] [Centre for Nanomaterials and Energy Devices, School of Physical Sciences, Swami Ramand Teerth Marathwada University, Nanded (India); Han, Sung-Hwan [Inorganic Nanomaterials Laboratory, Department of Chemistry, Hanyang University, Seoul 133-791 (Korea, Republic of)] [Inorganic Nanomaterials Laboratory, Department of Chemistry, Hanyang University, Seoul 133-791 (Korea, Republic of); Joo, Oh-Shim, E-mail: jookat@kist.ac.kr [Clean Energy Research Center, Korea Institute of Science and Technology, Seoul 130-650 (Korea, Republic of)] [Clean Energy Research Center, Korea Institute of Science and Technology, Seoul 130-650 (Korea, Republic of)

2012-12-15T23:59:59.000Z

500

Roughly speaking, a set is a collection of objects. The objects are called the members or the elements of the set.  

E-Print Network [OSTI]

2-24-2007 Sets Roughly speaking, a set is a collection of objects. The objects are called the members or the elements of the set. Set theory is the basis for mathematics, and there are a number of axiom systems for set theory; von Neumann-G¨odel-Bernays (NBG) and Zermelo-Fraenkel-Choice (ZFC

Ikenaga, Bruce