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1

projects are valued at approximately $67 million (including $15 million  

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

projects are valued at approximately $67 million (including $15 million projects are valued at approximately $67 million (including $15 million in non-Federal cost sharing) over four years. The overall goal of the research is to develop carbon dioxide (CO 2 ) capture and separation technologies that can achieve at least 90 percent CO 2 removal at no more than a 35 percent increase in the cost of electricity. The projects, managed by FE's National Energy Technology Laboratory (NETL), include: (1) Linde, LLC, which will use a post-combustion capture technology incorporating BASF's novel amine-based process at a 1-megawatt electric (MWe) equivalent slipstream pilot plant at the National Carbon Capture Center (NCCC) (DOE contribution: $15 million); (2) Neumann Systems Group, Inc., which will design, construct, and test a patented NeuStreamTM absorber at the Colorado

2

Readout of Energy Secretary Chu's Meetings in Riyadh, Saudi Arabia |  

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

Energy Secretary Chu's Meetings in Riyadh, Saudi Arabia Energy Secretary Chu's Meetings in Riyadh, Saudi Arabia Readout of Energy Secretary Chu's Meetings in Riyadh, Saudi Arabia February 22, 2010 - 12:00am Addthis Secretary Chu was in Riyadh today on his first stop of a four-day Middle East trip. He met with King Abdullah, Minister of Petroleum & Mineral Resources Ali Al Naimi and other senior officials. Secretary Chu reaffirmed the United States' commitment to a strong bilateral relationship with the Kingdom of Saudi Arabia and discussed energy security, alternative energy technologies, climate change, and science and technology issues. The Secretary began the day with a bilateral meeting with Minister Al Naimi. Topics on the agenda included global energy markets, Saudi Aramco's technology strategy and carbon capture and storage. The

3

Aggregate model and analysis of the energy dynamics in the Kingdom of Saudi Arabia  

E-Print Network [OSTI]

The Kingdom of Saudi Arabia is facing a crisis in the near future centered on increasing energy consumption. Today, the kingdom consumes approximately 1/3 of its oil production. If no action is taken and the kingdom continues ...

Al-Ahmed, Khalid A. (Khalid Abdulrahim)

2012-01-01T23:59:59.000Z

4

Complete pure vibrational spectrum of HD calculated without the Born-Oppenheimer approximation and including relativistic corrections  

SciTech Connect (OSTI)

All 18 bound pure vibrational levels of the HD molecule have been calculated within the framework that does not assume the Born-Oppenheimer (BO) approximation. The nonrelativistic energies of the states have been corrected for the relativistic effects of the order of {alpha}{sup 2} (where {alpha} is the fine structure constant), calculated using the perturbation theory with the nonrelativistic non-BO wave functions being the zero-order approximation. The calculations were performed by expanding the non-BO wave functions in terms of one-center explicitly correlated Gaussian functions multiplied by even powers of the internuclear distance and by performing extensive optimization of the Gaussian nonlinear parameters. Up to 10 000 basis functions were used for each state.

Bubin, Sergiy [Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235 (United States); Stanke, Monika [Department of Physics, Nicholas Copernicus University, ul. Grudziadzka 5, PL-87-100 Torun (Poland); Adamowicz, Ludwik [Department of Chemistry, University of Arizona, Tucson, Arizona 85721 (United States); Department of Physics, University of Arizona, Tucson, Arizona 85721 (United States)

2011-04-15T23:59:59.000Z

5

Complete pure vibrational spectrum of HD calculated without the Born-Oppenheimer approximation and including relativistic corrections  

Science Journals Connector (OSTI)

All 18 bound pure vibrational levels of the HD molecule have been calculated within the framework that does not assume the Born-Oppenheimer (BO) approximation. The nonrelativistic energies of the states have been corrected for the relativistic effects of the order of ?2 (where ? is the fine structure constant), calculated using the perturbation theory with the nonrelativistic non-BO wave functions being the zero-order approximation. The calculations were performed by expanding the non-BO wave functions in terms of one-center explicitly correlated Gaussian functions multiplied by even powers of the internuclear distance and by performing extensive optimization of the Gaussian nonlinear parameters. Up to 10 000 basis functions were used for each state.

Sergiy Bubin; Monika Stanke; Ludwik Adamowicz

2011-04-29T23:59:59.000Z

6

Corporate Social Responsibility in Saudi Arabia.  

E-Print Network [OSTI]

??Abstrakt Oppgaven utforsker forståelsen av bedriftenes samfunnsansvar (CSR) i Saudi Arabia og sammenligner denne forståelsen med den internasjonale diskursen av samme felt. For å definere… (more)

Gravem, Ole Magnus Berlin

2010-01-01T23:59:59.000Z

7

The acoustical performance of mosques' main prayer hall geometry in the eastern province, Saudi arabia  

E-Print Network [OSTI]

arabia H. Hossam Eldien and H. Al Qahtani Dammam Univ., P O Box 2397, 31451 Dammam, Saudi Arabia hany

Boyer, Edmond

8

Renewable energy options in Saudi Arabia: the economic viability of solar photovoltaics within the residential sector  

Science Journals Connector (OSTI)

Renewable energy options, including solar power, are becoming progressively more viable and thus increasingly pose challenges to conventional sources of energy, such as oil, coal and natural gas. Solar Photovoltaic technology is one type of solar energy ... Keywords: Saudi Arabia, feasibility study, renewable energy, residential buildings, solar photovoltaics

Yasser Al-Saleh; Hanan Taleb

2009-02-01T23:59:59.000Z

9

Saudi Arabia: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Saudi Arabia: Energy Resources Saudi Arabia: Energy Resources Jump to: navigation, search Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"TERRAIN","zoom":5,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"390px","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":25,"lon":45,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

10

Secretary Bodman Travels to Saudi Arabia to Discuss Global Energy  

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

Saudi Arabia to Discuss Global Energy Saudi Arabia to Discuss Global Energy Investments Secretary Bodman Travels to Saudi Arabia to Discuss Global Energy Investments January 19, 2007 - 10:38am Addthis Furthers Strategic Energy Dialogue between the Nations and Highlights U.S. - Saudi Scientific Innovation RIYADH, SAUDI ARABIA - U.S. Secretary of Energy Samuel W. Bodman today continued his six-nation visit to the Middle East and Europe with a two-day stop in Saudi Arabia where he met with Saudi Arabia's Minister of Petroleum and Mineral Resources Ali Ibrahim Al-Naimi to discuss joint energy cooperation. Secretary Bodman also toured the King Abdul-Aziz City for Science and Technology (KACST) and will tour the King Abdullah University of Science and Technology during his visit. "The United States and Saudi Arabia enjoy a relationship of global

11

Port employment in eastern Saudi Arabia: problems and prospects.  

E-Print Network [OSTI]

??Social, cultural and economic influences have combined to create a shortage of national manpower in Saudi Arabia. This study aims to investigate the extent of… (more)

Al-Nughimshi, Abdullah M

1998-01-01T23:59:59.000Z

12

King Fahd University of Petroleum & Dhahran -Saudi Arabia  

E-Print Network [OSTI]

King Fahd University of Petroleum & Minerals Dhahran - Saudi Arabia Faculty Promotion Regulations of the individual's academic accomplishments and achivements. King Fahd University of Petroleum & Minerals (KFUPM considered in promotion. The university shall use the promotion process to encourage academic excellence

Almulhem, Ahmad

13

Recommendations for Future Research in Riyadh, Saudi Arabia  

E-Print Network [OSTI]

Recommendations for Future Research in Riyadh, Saudi Arabia David J. Delene Atmospheric Sciences Department University of North Dakota #12;Motivation for Weather Modification Research Water Resource Stresses Severe Weather Hazards Inadvertent Weather Modification New Observational, Computational

Delene, David J.

14

A key review on present status and future directions of solar energy studies and applications in Saudi Arabia  

Science Journals Connector (OSTI)

Renewable energy is accepted as a key source for the future, not only for Saudi Arabia, but also for the world. Saudi Arabia has abundant potential for exploiting solar energy, which is renewable, clean, and freely available. The average annual solar radiation falling on the Arabian Peninsula is about 2200 kWh/m2. Applications of solar energy in Saudi Arabia have been growing since 1960. Solar hydrogen production plant situated at the Solar Village, Riyadh, Saudi Arabia, could have been considered as the world's first 350 kW solar-powered hydrogen-generation plant at the time of its inception. The development of solar energy, however, has been relatively low due to several obstacles although utilization of solar energy in its various aspects is very attractive for the country. The main objectives of this study are to address current applications and future aspects of solar energy along with studies conducted in this field and to assess them in the light of available sustainable energy technologies towards establishing energy policies. The solar energy-related topics reviewed include various types of solar radiation correlations, exergetic solar radiation, solar collectors, solar photovoltaic (PV) systems, solar stills, solar-powered irrigation, solar energy-related greenhouses, solar hydrogen, solar water desalination and solar energy education. Some barriers, scenarios and constraints are also covered. The utilization of solar energy could cover a significant part of the energy demand in the country. If a major breakthrough is achieved in the field of solar-energy conversion, Saudi Arabia can be a leading producer and exporter of solar energy in the form of electricity. The geographical location of the country, its widespread unused desert land, and year-round clear skies, all make it an excellent candidate for this.

Arif Hepbasli; Zeyad Alsuhaibani

2011-01-01T23:59:59.000Z

15

Riyadh, Saudi Arabia: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Riyadh, Saudi Arabia: Energy Resources Riyadh, Saudi Arabia: Energy Resources Jump to: navigation, search Name Riyadh, Saudi Arabia Equivalent URI DBpedia GeoNames ID 108410 Coordinates 24.640833°, 46.772778° 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":24.640833,"lon":46.772778,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

16

Yanbu, Saudi Arabia: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Yanbu, Saudi Arabia: Energy Resources Yanbu, Saudi Arabia: Energy Resources Jump to: navigation, search Name Yanbu, Saudi Arabia Equivalent URI DBpedia GeoNames ID 100425 Coordinates 24.085278°, 38.048611° 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":24.085278,"lon":38.048611,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

17

Dhahran, Saudi Arabia: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Dhahran, Saudi Arabia: Energy Resources Dhahran, Saudi Arabia: Energy Resources Jump to: navigation, search Name Dhahran, Saudi Arabia Equivalent URI DBpedia GeoNames ID 107797 Coordinates 17.433333°, 43.216667° 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":17.433333,"lon":43.216667,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

18

Solar energy in the Kingdom of Saudi Arabia  

Science Journals Connector (OSTI)

The Kingdom of Saudi Arabia is blessed with abundant solar energy which is renewable, clean and available freely. It is harnessed through known processes and technologies, but progress towards its commercialization is very slow for several reasons, such as higher cost and low efficiency. This paper reviews our R&D efforts, and concludes that future utilization of solar energy in the Kingdom of Saudia Arabia is dependent on current R&D activities in the field, combined with a proper educational campaign for its effective commercialization.

Saleh A. Al-Athel

1997-01-01T23:59:59.000Z

19

KING FAHD UNIVERSITY OF PETROLEUM & MINERALS Dhahran, Saudi Arabia  

E-Print Network [OSTI]

. INTRODUCTION 1 1.1 The nature of petroleum 1 1.2 The petroleum reservoir 1 1.3 Significance of rock properties.4 Resisitivity log 25 Chapter 6. ROCK PERMEABILITY 28 6.1 Definition 28 6.2 Differential form of Darcy's law 29 6KING FAHD UNIVERSITY OF PETROLEUM & MINERALS Dhahran, Saudi Arabia Basic Properties of Reservoir

Abu-Khamsin, Sidqi

20

Gamification to Improve Adherence to Diabeteic Treatment in Saudi Arabia  

E-Print Network [OSTI]

Gamification to Improve Adherence to Diabeteic Treatment in Saudi Arabia Alaa Abdullah Al, proposes the first Arabic system for managing diabetes using gamification. Keywords-component; Diabetes; Gamification; Self-Care; e- Healthcare I. INTRODUCTION Diabetes mellitus is one of the most common illnesses

Note: This page contains sample records for the topic "arabia include approximately" 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

The Sparse Grid Technique on GPUs Project: Virtual Arabia  

E-Print Network [OSTI]

simulations, e.g. simulating CO2 sequestration. The sparse grid technique is a discretization technique. In Virtual Arabia we use sparse grids for compressing and decompressing highly dimensional data coming from compared to 4 core and 8 core Intel Nehalem and 32 core AMD Opteron. Compression is up to 16 times faster

Stamatakis, Alexandros

22

Analysis of critical climate related factors for the application of zero-energy homes in Saudi Arabia  

Science Journals Connector (OSTI)

Abstract The Saudi construction industry is led by housing sector that imposes enormous energy and environmental challenges for the country. The housing sector is growing rapidly and is responsible for 52% of the total national electricity consumption. In order to promote sustainable development it is vital for Saudi Arabia to adopt sustainable housing practices such as zero-energy homes (ZEHs). The concept is new to Saudi Arabia though a number of \\{ZEHs\\} have already been developed around the world. One of the most significant challenges facing the application of \\{ZEHs\\} in Saudi Arabia is uncertainty about their adaptability in local climate. The present work aims to investigate this uncertainty, mainly focusing on the four climatic factors related to the application of \\{ZEHs\\} including air temperature, relative humidity, wind speed and global solar radiation. This is fulfilled by reviewing climatic condition of Saudi Arabia and the concept of \\{ZEHs\\} and examining some of these homes built across the globe in climates similar to the Saudi climatic zones. In this respect, five \\{ZEHs\\} globally developed in climates matching with the five main Saudi climatic zones have been investigated as case studies. A typical-virtual home has been designed on the basis of a questionnaire survey. With the help of the Integrated Environmental Solution ?Virtual Environment? software a modelling exercise has been carried out to compare its energy performance at the five selected international locations with their corresponding Saudi locations. This comparison is based upon the maximum and mean power demand. Furthermore, to cater for the differences in climatic conditions between the Saudi locations and their counterpart global locations, a sensitivity analysis for the studied locations has been undertaken for the four climate factors.

Farajallah Alrashed; Muhammad Asif

2015-01-01T23:59:59.000Z

23

U.S. Energy Secretary Visits Saudi Arabia | Department of Energy  

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

Saudi Arabia Saudi Arabia U.S. Energy Secretary Visits Saudi Arabia November 17, 2005 - 2:48pm Addthis Meeting with Minister Al-Naimi, tour of Shaybah oil field, and kick-off of International Energy Forum highlight four-day visit DHAHRAN, SAUDI ARABIA - U.S. Secretary of Energy Samuel W. Bodman is continuing his four-day visit to the Middle East in Saudi Arabia today, meeting with Saudi Arabia's Minister of Petroleum and Mineral Resources Ali bin Ibrahim Al-Naimi, touring the Aramco headquarters and visiting Aramco's Shaybah oil field. "Consumers of energy and producers of energy are becoming ever-more intertwined, and a strong, vibrant relationship will help us work together for years to come," Secretary Bodman said. "It's important that we understand each other and recognize each other's needs for both the short

24

Introduction Apis mellifera L. is native to Europe, Africa, and Asia (including Saudi  

E-Print Network [OSTI]

Introduction Apis mellifera L. is native to Europe, Africa, and Asia (including Saudi Arabia, Iran migrations and introductions (Ruttner, 1988). Apis mellifera includes about two dozen subspecies bee (Apis mellifera L.) populations from the USA Allen L Szalanski1* and Roxane M Magnus1 1 Social

Szalanski, Allen L.

25

Soils and agricultural development in the region of Al-Qassim, Saudi Arabia.  

E-Print Network [OSTI]

??The process of agricultural development and its related problems is. a serious economic difficulty facing the developing countries throughout the world. In Saudi Arabia such… (more)

Al-Jerash, Mohammed Abdullah

1968-01-01T23:59:59.000Z

26

Saudi-Arabias forverrede forhold til Iran etter 2011. : En konsekvens av økte indre spenninger?.  

E-Print Network [OSTI]

??Helt siden den islamske revolusjonen i Iran i 1979 har relasjonen mellom Saudi-Arabia og Iran vært preget av spenning. Begge landene ønsker, ved å spre… (more)

Grimsrud, Siri

2013-01-01T23:59:59.000Z

27

Assessing temporal and spatial variations in atmospheric dust over Saudi Arabia through satellite, radiometric, and station data  

E-Print Network [OSTI]

1 Assessing temporal and spatial variations in atmospheric dust over Saudi Arabia through satellite Saud University, Riyadh, Saudi Arabia #12;2 Abstract1 Temporal and spatial variations in atmospheric dust over Saudi Arabia are studied for 2000-20102 using satellite and ground-based Aerosol Optical

Wisconsin at Madison, University of

28

Enclosed and open spaces in the arid region-Saudi Arabia  

SciTech Connect (OSTI)

Study of the enclosed (sheltered) and open (unsheltered) spaces in two tradiational and three-contemporary settlements in Saudi Arabia - comparative analysis of micro climatic conditions - solar exposure - analysis of the differences in the design approaches of the old and new ''modern'' developments - recommendations for the appropriate approach to the design of enclosed and open spaces in the arid regions of Saudi Arabia.

Talib, K.; Al-Zamil, A.A.

1986-01-01T23:59:59.000Z

29

A passive solar test facility for Saudi Arabia  

SciTech Connect (OSTI)

A passive solar test facility has been designed for Dammam, Saudi Arabia. It will be located on the campus of King Faisal University, adjacent to the Persian Gulf. This maritime desert climate is terribly sevre, and one for which it is a formidable challenge to design a year around thermally efficient building. This facility incorporates seven different passive strategies: proper orientation, operable shading for windows, flow-through ventilation, externally insulated thermal mass, wind tower with direct evaporative cooling, indirect evaporative cooling through a double shell, and solar water heating. Construction should begin in June of 1983. Upon completion, the building will be monitored for at least two years.

Woods, P.K.

1983-06-01T23:59:59.000Z

30

E-Print Network 3.0 - arabia syrian arab Sample Search Results  

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

Saudi-Arabia 162 Japan 69 Taiwan 59 Hong-Kong 31 Kuwait 29 Malaysia 28... Thailand 12 Jordan 11 Colombia 10 Iraq 10 Mexico 10 Nigeria 10 Sri-Lanka 10 Libyan-Arab-Jamahiriya 9...

31

Pall opens office in Saudi Arabia and life sciences centre of excellence in the UK  

Science Journals Connector (OSTI)

US-based Pall Corp recently inaugurated its new office in Saudi Arabia. The filtration, separation and purification company is also opening a life sciences centre of excellence in the UK.

2013-01-01T23:59:59.000Z

32

Airborne dust in Saudi Arabia : source areas, entrainment, simulation and composition.  

E-Print Network [OSTI]

??Spatial and temporal characteristics of dust storm activity in Saudi Arabia has been established using coarse-particle (PM10) dust concentrations recorded by the KACST monitoring network… (more)

Alharbi, Badr Hadhidh A

2009-01-01T23:59:59.000Z

33

The meeting point : rethinking public space in the city of Jeddah, Saudi Arabia  

E-Print Network [OSTI]

Can urban intervention affect social behaviors within a city? And if so, what happens when that city is partial to cultural restrictions? The target in question here is the city of Jeddah, Saudi Arabia. The dilemma is that ...

Abuzeid, Reem

2012-01-01T23:59:59.000Z

34

Bionomics of phlebotomine sand flies (Diptera: Psychodidae) in the province of Al-Baha, Saudi Arabia  

E-Print Network [OSTI]

The bionomics of phlebotomine sand flies (Diptera: Psychodidae) were studied for two successive years (January 1996-December 1997) at 12 collecting stations representing six sectors of the province of Al-Baha, Saudi Arabia. The predominant species...

Doha, Said Abdallah; Samy, Abdallah Mohammed

2010-11-01T23:59:59.000Z

35

Model for electric energy consumption in eastern Saudi Arabia  

SciTech Connect (OSTI)

Electrical energy consumption in the eastern province of Saudi Arabia is modeled as a function of weather data, global solar radiation, population, and gross domestic product per capita. Five years of data have been used to develop the energy consumption model. Variable selection in the regression model is carried out by using the general stepping-regression technique. Model adequacy is determined from a residual analysis technique. Model validation aims to determine if the model will function successfully in its intended operating field. In this regard, new energy consumption data for a sixth year are collected, and the results predicted by the regression model are compared with the new data set. Finally, the sensitivity of the model is examined. It is found that the model is strongly influenced by the ambient temperature.

Al-Garni, A.Z.; Al-Nassar, Y.N.; Zubair, S.M.; Al-Shehri, A. [King Fahd Univ. of Petroleum and Minerals, Dhahran (Saudi Arabia)

1997-05-01T23:59:59.000Z

36

Kingdom of Saudi Arabia Ministry of Petroleum and Mineral Resources | Open  

Open Energy Info (EERE)

Kingdom of Saudi Arabia Ministry of Petroleum and Mineral Resources Kingdom of Saudi Arabia Ministry of Petroleum and Mineral Resources Jump to: navigation, search Logo: Kingdom of Saudi Arabia Ministry of Petroleum and Mineral Resources Country Saudi Arabia Name Kingdom of Saudi Arabia Ministry of Petroleum and Mineral Resources Address PO Box 757, Airport Road, Riyadh 11189 City Riyadh Website http://www.mopm.gov.sa/mopm/ma Coordinates 24.800234°, 46.71742° 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":24.800234,"lon":46.71742,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

37

Evidence for Early and Mid-Cryogenian glaciation in the Northern ArabianNubian Shield (Egypt, Sudan, and western Arabia)  

E-Print Network [OSTI]

(Egypt, Sudan, and western Arabia) ROBERT J. STERN1*, PETER R. JOHNSON2, KAMAL A. ALI1,3 & SUMIT K over broad regions of the Central Eastern Desert of Egypt, NW Arabia and possible correlative units diamictite and BIFs of the Central Eastern Desert of Egypt and the correlative Nuwaybah diamictite and BIF

Stern, Robert J.

38

Design and implementation of wind energy system in Saudi Arabia  

Science Journals Connector (OSTI)

Abstract This paper introduces an accurate procedure to choose the best site from many sites and suitable wind turbines for these sites depending on the minimum price of kWh generated (Energy Cost Figure (ECF)) from wind energy system. In this paper a new proposed computer program has been introduced to perform all the calculations and optimization required to accurately design the wind energy system and matching between sites and wind turbines. Some of cost calculations of energy methods have been introduced and compared to choose the most suitable method. The data for five sites in Saudi Arabia and hundred wind turbines have been used to choose the best site and the optimum wind turbine for each site. These sites are Yanbo, Dhahran, Dhulom, Riyadh, and Qaisumah. One hundred wind turbines have been used to choose the best one for each site. This program is built in a generic form which allows it to be used with unlimited number of sites and wind turbines in all over the world. The program is written by using Visual Fortran and it is verified with simple calculation in Excel. The paper showed that the best site is Dhahran and the suitable wind turbine for this site is KMW-ERNO with 5.85 Cents/kWh. The worst site to install wind energy system is Riyadh with minimum price of kWh of 12.81 Cents/kWh in case of using GE Energy 2 wind turbine.

Ali M. Eltamaly

2013-01-01T23:59:59.000Z

39

Fast Approximate Convex Decomposition  

E-Print Network [OSTI]

Approximate convex decomposition (ACD) is a technique that partitions an input object into "approximately convex" components. Decomposition into approximately convex pieces is both more efficient to compute than exact convex decomposition and can...

Ghosh, Mukulika

2012-10-19T23:59:59.000Z

40

Wind resource assessment of eastern coastal region of Saudi Arabia  

Science Journals Connector (OSTI)

Depleting oil and gas reserves, combined with growing concerns of global warming, have made it inevitable to seek energy from renewable energy sources such as wind. The utilization of energy from wind is becoming increasingly attractive and is being widely used/disseminated for substitution of oil-produced energy, and eventually to minimize atmospheric degradation. Quantitative assessment of wind resource is an important driving element in successful establishment of a wind farm/park at a given location. More often than not, windenergy resources are relatively better along coastlines. In the present study, hourly mean wind-speed data of the period 1986–1997 recorded at the solar radiation and meteorological station, Dhahran (26°32? N, 50°13? E, eastern coastal plain of Saudi Arabia), have been analyzed to present different characteristics of wind speed in considerable depth such as: yearly, monthly, diurnal variations of wind speed, etc. The long-term monthly average wind speeds for Dhahran range from 4.2–6.4 m/s. More importantly, the study deals with impact of hub height on wind energy generation. Attention has also been focussed on monthly average daily energy generation from different sizes of commercially available wind machines (150, 250, 600 kW) to identify optimum wind machine size from energy production point of view. It has been found that for a given 6 MW wind farm size, at 50 m hub height, cluster of 150 kW wind machines yields about 48% more energy as compared to 600 kW wind machines. Literature shows that commercial/residential buildings in Saudi Arabia consume an estimated 10–40% of the total electric energy generated. So, concurrently, as a case study, attempt has been made to investigate/examine the potential of utilizing hybrid (wind+diesel) energy conversion systems to meet the load requirements of hundred typical 2-bedroom residential buildings (with annual electrical energy demand of 3512 MWh). The hybrid systems considered in the present case-study consist of different combinations of wind machines (of various capacities), supplemented with battery storage and diesel back-up. The deficit energy generated from the back-up diesel generator and the number of operational hours of the diesel system to meet a specific annual electrical energy demand of 3512 \\{MWh\\} have also been presented. The diesel back-up system is operated at times when the power generated from wind energy conversion systems (WECS) fails to satisfy the load and when the battery storage is depleted. The evaluation of hybrid system shows that with seven 150 kW WECS and three days of battery storage, the diesel back-up system has to provide 17.5% of the load demand. However, in absence of battery storage, about 37% of the load needs to be provided by the diesel system.

M.A. Elhadidy; S.M. Shaahid

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "arabia include approximately" 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

Short term wind speed estimation in Saudi Arabia  

Science Journals Connector (OSTI)

Abstract In this paper, three methods are used for the prediction of wind speed, 12 h ahead, based on 72 h previous wind speed values at three locations viz. Rawdat Bin Habbas (inland north), Juaymah (east coast), and Dhulom (inland western region) in Saudi Arabia. These methods are Particle Swarm Optimization (PSO), Abductory Induction Mechanism (AIM), and the Persistence (PER) model. The available data at each site was divided into three consecutive groups. The first 50% was used for training, the second 25% for validation, and the remaining 25% for testing. The validation data set was used to select the network architecture and other user defined parameters. The testing data was used only to assess the performance of the networks on future unseen data that has not been used for training or model selection. For each of the three methods, each of 12 networks was trained to produce the wind speed at one of the next 12 h. Relatively, Close agreements were found between the predicted and measured hourly mean wind speed for all three locations with coefficient of correlation R2 values between 81.7% and 98.0% for PSO, between 79.8% and 98.5% for AIM and between 59.5% and 88.4% for persistence model. Both PSO and AIM methods underestimated WS values during most hours with an average value of 0.036 m/s and 0.02 m/s, respectively. However, persistence model overestimated the WS by an average value of 0.51 m/s. It is shown that the two developed models outperformed the persistence model on predicting wind speed 12 h ahead of time with slight advantage to the PSO method.

Mohamed Ahmed Mohandes; Shafiqur Rehman

2014-01-01T23:59:59.000Z

42

In-situ evidence for dextral active motion at the Arabia-India plate boundary  

E-Print Network [OSTI]

-Owen-Carlsberg (AOC) triple junction13 . Earthquake focal mechanisms indicate dextral strike-slip motion3,4 : Arabia, aboard the R/V Beautemps-Beaupré, we mapped the AOC triple junction and the southern extremity of the OFZ

43

From Saudi Arabia to Venezuela: Energy Resources, Market Factors & ConflictsEnergy Resources, Market Factors & Conflicts  

E-Print Network [OSTI]

From Saudi Arabia to Venezuela: Energy Resources, Market Factors & ConflictsEnergy Resources, Market Factors & Conflicts Dr. Tom O'Donnell Friday, 12:00 ­ 2:48 PM Room 125, Mendenhall Laboratory (Brazil, Russia, India and China) will end U.S. supremacy in the dollar based oil market? Lastly, we

O'Donnell, Tom

44

GPS network monitors the Arabia-Eurasia collision deformation in Iran F. Nilforoushan1  

E-Print Network [OSTI]

GPS network monitors the Arabia-Eurasia collision deformation in Iran F. Nilforoushan1 , F. Masson2 Department, National Cartographic Centre, PO Box 13185­1684, Meraj Ave, Tehran, Iran e-mail: f and Seismology, Farmanieh, Dibaji, Arghavan St., No. 27, 19531 Tehran, Iran Received: 22 July 2002 / Accepted: 26

Vernant, Philippe

45

Low fault friction in Iran implies localized deformation for the ArabiaEurasia collision zone  

E-Print Network [OSTI]

Low fault friction in Iran implies localized deformation for the Arabia­Eurasia collision zone P velocity field of the present-day deformation in Iran is modeled using a 3-dimensional (3D) finite element of the kinematics in Iran, but the complex velocity field of the surrounding South Caspian basin cannot be fitted

Vernant, Philippe

46

Quantitative lithostratigraphic interpretation of seismic data for characterization of the Unayzah Formation in central Saudi Arabia  

Science Journals Connector (OSTI)

...Fournier Pierre-Yves Dequirez Costas G. Macrides Marty Rademakers Institut Francais du Petrole, 1 et 4, ave. de Bois-Preau...p-yves.dequirez@ifp.fr Macrides Costas G. Author Rademakers Marty Author Saudi Aramco Oil Company Saudi Arabia 1372 1381...

Frédérique Fournier; Pierre-Yves Déquirez; Costas G. Macrides; Marty Rademakers

47

Final Report for Annex II--Assessment of Solar Radiation Resources In Saudi Arabia, 1998-2000  

SciTech Connect (OSTI)

The Final Report for Annex II - Assessment of Solar Radiation Resources in Saudi Arabia 1998-2000 summarizes the accomplishment of work performed, results achieved, and products produced under Annex II, a project established under the Agreement for Cooperation in the Field of Renewable Energy Research and Development between the Kingdom of Saudi Arabia and the United States. The report covers work and accomplishments from January 1998 to December 2000. A previous progress report, Progress Report for Annex II - Assessment of Solar Radiation Resources in Saudi Arabia 1993-1997, NREL/TP-560-29374, summarizes earlier work and technical transfer of information under the project. The work was performed in at the National Renewable Energy Laboratory (NREL) in Golden, Colorado, at the King Abdulaziz City for Science and Technology (KACST) in Riyadh, Saudi Arabia, and at selected weather stations of the Saudi Meteorological and Environmental Protection Administration (MEPA).

Myers, D. R.; Wilcox, S. M.; Marion, W. F.; Al-Abbadi, N. M.; Mahfoodh, M.; Al-Otaibi, Z.

2002-04-01T23:59:59.000Z

48

Quasiclassical Born-Oppenheimer approximations  

E-Print Network [OSTI]

We discuss several problems in quasiclassical physics for which approximate solutions were recently obtained by a new method, and which can also be solved by novel versions of the Born-Oppenheimer approximation. These cases include the so-called bouncing ball modes, low angular momentum states in perturbed circular billiards, resonant states in perturbed rectangular billiards, and whispering gallery modes. Some rare, special eigenstates, concentrated close to the edge or along a diagonal of a nearly rectangular billiard are found. This kind of state has apparently previously escaped notice.

Oleg Zaitsev; R. Narevich; R. E. Prange

2000-09-29T23:59:59.000Z

49

Microsoft PowerPoint - Saudi Arabia 2-22-10 final for distribution.pptx  

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

Solving the Energy and Solving the Energy and Climate Challenge Together Secretary Steven Chu International Energy Forum Riyadh, Saudi Arabia 22 February 2010 King Faisal Prize Winners, 1993 The United States of America and Saudi Arabia have a long and deep relationship We are adding a new dimension to our Saudi King Abdul Aziz Al Saud and President Franklin Delano Roosevelt on the USS Quincy 65 years ago dimension to our relationship - as we move to meet shared energy and climate challenges (1) The global economy needs energy resources. (2) Our long-term economic prosperity is tied to the sustainable use of energy. (3) There are risks of adverse climate change for The Energy and Climate Challenge (3) There are risks of adverse climate change for both our countries. (4) We don't have the luxury of focusing only on

50

Pump apparatus including deconsolidator  

DOE Patents [OSTI]

A pump apparatus includes a particulate pump that defines a passage that extends from an inlet to an outlet. A duct is in flow communication with the outlet. The duct includes a deconsolidator configured to fragment particle agglomerates received from the passage.

Sonwane, Chandrashekhar; Saunders, Timothy; Fitzsimmons, Mark Andrew

2014-10-07T23:59:59.000Z

51

Approximation Algorithms Tandy Warnow  

E-Print Network [OSTI]

size and 1 / . #12;Approximation algorithms for: Minimum Vertex Cover (finding a set of vertices-SAT 3-SAT DIR-HAM-CYCLEINDEPENDENT SET VERTEX COVER GRAPH 3-COLOR HAM-CYCLE TSP SUBSET-SUM SCHEDULINGPLANAR 3-COLOR SET COVER NP-Completeness by definition of NP-completeness #12;NP-hard Optimization

Warnow,Tandy

52

Reservoir characteristics of the Devonian Jauf Formation in Shedgum area, Saudi Arabia  

E-Print Network [OSTI]

. Porosity generally increases as mean grain size increases. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 26 Correlation of permeability with porosity from core analysis of the Jauf Formation in Shedgum S-ll. 61 27 Plots of log porosity... Dead + LUT o ? I RAG o~ BLOCK '' SINAI JORDAN c n D v Z ct ct I- ID J 0 Q Q $ " ocr:. . ro ++ ct Lrnere ~ a SAUDI ARABIA pipE J tt D BI nknna Mnenrnnrcy mr Arookon Sco Ar/en oak/ a/ 30' 40 50' 60' Figure 2 - Index map showing...

Al-Duaiji, Abdulaziz Abdullah

2012-06-07T23:59:59.000Z

53

Lead and chromium concentrations in the potable water of the Eastern Province of Saudi Arabia  

SciTech Connect (OSTI)

The World Health Organization (WHO) and United States Public Health Service (USPHS) standards for drinking water recommend an upper limit concentration of 0.05 mg/L for both lead and chromium. The authors studied the cadmium and zinc concentrations in the potable water of the Eastern Province of the Kingdom of Saudi Arabia. They report here the results of the study of lead and chromium concentrations in the potable water of the same area to provide a more complete profile of the levels of heavy metals in the potable water of the Eastern Province.

Hassan, H.M.A.; Mustafa, H.T.; Rihan, T.I. (King Faisal Univ., Dammam (Saudi Arabia))

1989-10-01T23:59:59.000Z

54

Techno-economic evaluation of waste lube oil re-refining in Saudi Arabia  

SciTech Connect (OSTI)

About 80 million gallons of automotive lubricating oils are sold in Saudi Arabia. Much of this oil, after use, is actually contributing to the increased pollution of land because of indiscriminate dumping. Any scheme of secondary use of the waste lube oils would be of interest both for conservation of energy resources and for protection of environment. This paper discusses the secondary use for the used automotive lubricating oils. Process technology of Meinken, Mohawk and KTI were selected for the techno-economic feasibility study for refining used oil. Profitability analysis of each process is worked out and the results are compared.

Ali, M.F.; Hamdan, A.J.; Rahman, F. [King Fahd Univ. of Petroleum & Minerals, Dhahran (Saudi Arabia)

1995-12-31T23:59:59.000Z

55

Set Covering and Network Optimization: Dynamic and Approximation Algorithms  

E-Print Network [OSTI]

Set Covering and Network Optimization: Dynamic and Approximation Algorithms Orestis A. Telelis summarize our results on development and analysis of approximation and dynamic algorithms for set covering and network optimization problems. The results include probabilistic analysis of set covering algorithms

Kouroupetroglou, Georgios

56

“Shock event”, an impact phenomenon observed in water wells around the Arabian Gulf coastal city Dammam, Saudi Arabia: possible relationship with Sumatra tsunami event of December 26, 2004  

Science Journals Connector (OSTI)

A sudden disturbance in water level was recorded by hydrographs monitoring wells in the coastal city Dammam, Saudi Arabia on December 26, 2004. The water level was being ... h after the Sumatra earthquake/tsunami...

Arun Kumar; Syed A. Alam

2010-05-01T23:59:59.000Z

57

A survey of intention to leave, job stress, burnout and job satisfaction among nurses employed in the Ha'il region's hospitals in Saudi Arabia.  

E-Print Network [OSTI]

??Nurses in Saudi Arabia, as in other Arabian Gulf countries, may be nationals or non-nationals. Frequently, non-national nurses predominate in a workplace, and as they… (more)

Alsaqri, S

2014-01-01T23:59:59.000Z

58

The development of contemporary housing in Saudi Arabia (1950-1983) : a study in cross-cultural influence under conditions of rapid change  

E-Print Network [OSTI]

This study provides a framework for understanding the circumstances associated with the introduction of modern housing concepts and techniques to Saudi Arabia. The analysis and discussion of the relevant cultural influences ...

Fadan, Yousef M. (Yousef Mohammed)

1983-01-01T23:59:59.000Z

59

Approximating the Permanent with Belief Propagation  

E-Print Network [OSTI]

, then use Bethe free energy to approximate this partition function. After deriving some speedups to standard, not to mention relatively high polynomial running times that discourage their usage in practical applications-connected networks such as trees. In certain special loopy graph cases, including graphs with a single loop

Huang, Bert

60

Approximate Inference and Protein-Folding  

E-Print Network [OSTI]

Approximate Inference and Protein-Folding Chen Yanover and Yair Weiss School of Computer Science Side-chain prediction is an important subtask in the protein-folding problem. We show that #12;nding algorithms, including a widely used protein-folding software (SCWRL). 1 Introduction Inference in graphical

Weiss, Yair

Note: This page contains sample records for the topic "arabia include approximately" 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

Algorithms for Polytope Covering and Approximation, and for Approximate  

E-Print Network [OSTI]

@research.att.com Abstract This paper gives an algorithm for polytope covering: let L and U be sets of points in RdAlgorithms for Polytope Covering and Approximation, and for Approximate Closest-point Queries draft , comprising n points altogether. A cover for L from U is a set C U with L a subset of the convex hull of C

Clarkson, Kenneth L.

62

Algorithms for Polytope Covering and Approximation, and for Approximate  

E-Print Network [OSTI]

@research.att.com Abstract This paper gives an algorithm for polytope covering : let L and U be sets of points in R dAlgorithms for Polytope Covering and Approximation, and for Approximate Closest-point Queries draft , comprising n points altogether. A cover for L from U is a set C #26; U with L a subset of the convex hull

Clarkson, Kenneth L.

63

Algorithms for Polytope Covering and Approximation, and for Approximate  

E-Print Network [OSTI]

an algorithm for polytope covering: let L and U be sets of points in Rd, comprising n points altogether Algorithms for Polytope Covering and Approximation, and for Approximate. A cover for L from U is a set C U with L a subset of the convex hull of C. Suppose c

Clarkson, Kenneth L.

64

Case study of the 9 April 2009 `brown' cloud: Observations and modeling of convective clouds in Saudi Arabia, David J Delene and Jeffrey S Tilley, University of North Dakota, Grand Forks, ND  

E-Print Network [OSTI]

was funded by the Kingdom of Saudi Arabia through a contract with Weather Modification Inc (WMI). We also in Saudi Arabia, David J Delene and Jeffrey S Tilley, University of North Dakota, Grand Forks, ND Terry Krauss, Weather Modification, Inc., Fargo, ND ` Introduction Photographs of ice accumulation

Delene, David J.

65

Energy consumption, carbon dioxide emissions and economic growth: The case of Saudi Arabia  

Science Journals Connector (OSTI)

Abstract This paper investigates the dynamic causal relationships between energy consumption, energy price and economic activity in Saudi Arabia based on a demand side approach. We use a Johansen multivariate cointegration approach and incorporate CO2 emissions as a control variable. The results indicate that there exists at least a long-run relationship between energy consumption, energy price, carbon dioxide emissions, and economic growth. Furthermore, a long-run unidirectional causality stands from energy consumption to economic growth and CO2 emissions, bidirectional causality between carbon dioxide emissions and economic growth, and a long-run unidirectional causality runs from energy price to economic growth and CO2 emissions. In the short-run, there is unidirectional causality running from CO2 emissions to energy consumption and economic output and from energy price to CO2 emissions. Even though, the energy-led growth hypothesis is valid, the share of energy consumption in explaining economic growth is minimal. Energy price is the most important factor in explaining economic growth. Hence, policies aimed at reducing energy consumption and controlling for CO2 emissions may not reduce significantly Saudi?s economic growth. Investing in the use of renewable energy sources like solar and wind power is an urgent necessity to control for fossil fuel consumption and CO2 emissions.

Atef Saad Alshehry; Mounir Belloumi

2015-01-01T23:59:59.000Z

66

Cadmium and zinc concentrations in the potable water of the Eastern Province of Saudi Arabia  

SciTech Connect (OSTI)

The effects of acute cadmium poisoning on humans are very serious. Among them are hypertension, cardiovascular disorders, kidney damage and destruction of red blood cells and testicular tissues. It is believed that much of the physiological action of cadmium is due to its replacement of zinc in some enzymes thereby impairing its catalytic activity. Previous studies on rats indicated that the dietary level of zinc can influence susceptibility to cadmium. The Eastern Province of the Kingdom of Saudi Arabia is undergoing extensive industrialization, crude oil exploration, production, processing and exportation. All of these are sources of trace heavy metal pollution. It is inhabited by a population where private and public water wells, particularly in the rural areas, are in most cases the major source of potable water. This paper deals with the determination of cadmium and zinc concentration in the potable water of the Eastern Province in order to generate baseline data to enable the medically qualified members of the research team to study the possible relationship between these two ions and cardiovascular morbidity in the population consuming this water.

Mustafa, H.T.; Hassan, H.M.A.; Abo-Melha, A.; Rihan, T.I.

1988-03-01T23:59:59.000Z

67

Electromagnetic interference from transmission lines located in central region of Saudi Arabia  

SciTech Connect (OSTI)

This paper discusses the electromagnetic interference (EMI) generated by transmission lines operating in the Central Region of Saudi Arabia. These lines have operating voltages of 132, 230 and 380 kV and are located in a hot, dry arid desert land where precipitaton is very low. Measurements of typical EMI characteristics such as frequency spectrum, lateral profile and statistical variation are performed for each type of line and results are analyzed. It is found that general noise characteristic of these lines are similar to those reported in the literature for other lines which are located in relatively wet environment. The results further show that if operating gradients are low, the increase of EMI due to rain is lower than 20 dB value usually observed. The presence of sand and dust storms does not increase EMI level in any appreciable manner. The fair weather EMI level of these lines can be predicted with reasonable accuracy by using the CIGRE formula. Results are also presented for power line carrier related EMI.

Al-Arainy, A.A.; Malik, N.H.; Abdul-Aal, L.N.

1988-01-01T23:59:59.000Z

68

Electromagnetic interference from transmission lines located in central region of Saudi Arabia  

SciTech Connect (OSTI)

This paper discusses the electromagnetic interference (EMI) generated by transmission lines operating in the Central Region of Saudi Arabia. These lines have operating voltages of 132, 230 and 380 kV and are located in a hot, dry arid desert land where precipitation is very low. Measurements of typical EMI characteristics such as frequency spectrum, lateral profile and statistical variation are performed for each type of line and results are analyzed. It is found that general noise characteristic of these lines are similar to those reported in the literature for other lines which are located in relatively wet environment. The results further show that if operating gradients are low, the increase of EMI due to rain is lower than 20 dB value usually observed. The presence of sand and dust storms does not increase EMI level in any appreciable manner. The fair weather EMI level of these lines can be predicted with reasonable accuracy by using the CIGRE formula. Results are also presented for power line carrier related EMI.

Al-Arainy, A.A.; Malik, N.H.; Abdul-Aal, L.N.

1989-01-01T23:59:59.000Z

69

Regression analysis of residential air-conditioning energy consumption at Dhahran, Saudi Arabia  

SciTech Connect (OSTI)

The energy consumption of a house air conditioner located at Dhahran, Saudi Arabia, is modeled as a function of weather parameters and total (global) solar radiation on a horizontal surface. The selection of effective parameters that significantly influence energy consumption is carried out using general stepping regression methods. The problem of collinearity between the regressors is also investigated. The final model involves parameters of total solar radiation on a horizontal surface, wind speed, and temperature difference between the indoor and outdoor condition. However, the model coefficients are functions of relative humidity and/or temperature difference between the indoor and outdoor condition. Model adequacy is examined by the residual analysis technique. Model validation is carried out by the data-splitting technique. The sensitivity of the model indicates that relative humidity and temperature difference strongly influence the cooling energy consumption. It was found that an increase in relative humidity from 20% to 100% can cause a 100% increase in cooling energy consumption during the high cooling season.

Abdel-Nabi, D.Y.; Zubair, S.M.; Abdelrahman, M.A.; Bahel, V. (Energy Systems Group, Div. of Energy Resources, Research Inst., King Fahd Univ. of Petroleum and Minerals, Dhahran (SA))

1990-01-01T23:59:59.000Z

70

New software for hybrid renewable energy assessment for ten locations in Saudi Arabia  

Science Journals Connector (OSTI)

This paper introduces a design and optimization methodology for autonomous hybrid photovoltaic (PV)/wind/battery energy system. The main function of the proposed methodology is to determine the optimum size of each component of the energy system for the lowest cost of kWh generated and the best loss of load probability. This methodology uses the hourly wind speed hourly radiation and hourly load power with many different types of wind turbines and PV module types to get the optimum size of each component and the minimum cost of kWh generated at highest reliability. This methodology changes the share ratio of wind/PV with certain increments and calculates the required size of all components and the optimum battery size to get the predefined lowest acceptable probability. This methodology is implemented using a new computer program in flexible fashion which is not available in any market available software such as HOMER or RETSCREEN software. Actual data for ten Saudi sites are used with this computer program. The results obtained from the proposed program are compared with HOMER software. The proposed computer program performed the optimal design steps in very short time and with accurate results. Very valuable results can be extracted from the new computer program that could help researchers and decision makers. The results obtained from the proposed computer program have established the economic feasibility of installing hybrid energy systems in many sites of Saudi Arabia.

2013-01-01T23:59:59.000Z

71

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

72

Extractant composition including crown ether and calixarene extractants  

DOE Patents [OSTI]

An extractant composition comprising a mixed extractant solvent consisting of calix[4] arene-bis-(tert-octylbenzo)-crown-6 ("BOBCalixC6"), 4',4',(5')-di-(t-butyldicyclo-hexano)-18-crown-6 ("DtBu18C6"), and at least one modifier dissolved in a diluent. The DtBu18C6 may be present at from approximately 0.01M to approximately 0.4M, such as at from approximately 0.086 M to approximately 0.108 M. The modifier may be 1-(2,2,3,3-tetrafluoropropoxy)-3-(4-sec-butylphenoxy)-2-propanol ("Cs-7SB") and may be present at from approximately 0.01M to approximately 0.8M. In one embodiment, the mixed extractant solvent includes approximately 0.15M DtBu18C6, approximately 0.007M BOBCalixC6, and approximately 0.75M Cs-7SB modifier dissolved in an isoparaffinic hydrocarbon diluent. The extractant composition further comprises an aqueous phase. The mixed extractant solvent may be used to remove cesium and strontium from the aqueous phase.

Meikrantz, David H. (Idaho Falls, ID); Todd, Terry A. (Aberdeen, ID); Riddle, Catherine L. (Idaho Falls, ID); Law, Jack D. (Pocalello, ID); Peterman, Dean R. (Idaho Falls, ID); Mincher, Bruce J. (Idaho Falls, ID); McGrath, Christopher A. (Blackfoot, ID); Baker, John D. (Blackfoot, ID)

2009-04-28T23:59:59.000Z

73

Meals included in Conference Registrations  

E-Print Network [OSTI]

Meals included in Conference Registrations Meals included as part of the cost of a conference the most reasonable rates are obtained. Deluxe hotels and motels should be avoided. GSA rates have been for Georgia high cost areas. 75% of these amounts would be $21 for non- high cost areas and $27 for high cost

Arnold, Jonathan

74

Approximation Algorithms for Covering Problems  

E-Print Network [OSTI]

?-approximation for general CIP with {0, 1} variables [24].details of an extension to CIP with general upper bounds onCovering Integer Programs ( CIP ). Given a non-negative cost

Koufogiannakis, Christos

2009-01-01T23:59:59.000Z

75

The Born-Oppenheimer Approximation  

Science Journals Connector (OSTI)

In physics and chemistry the Born-Oppenheimer approximation is a very important method for...1). It is based on the important fact that the molecular Schrödinger operator contains one small parameter, the ratio k

J. M. Combes; P. Duclos; R. Seiler

1981-01-01T23:59:59.000Z

76

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

77

Techno-economic evaluation of waste lube oil re-refining in Saudi Arabia  

SciTech Connect (OSTI)

About 80 million gallons of automotive lubricating oils are sold in Saudi Arabia. Much of this oil, after use, is actually contributing to the increased pollution of land because of indiscriminate dumping. Any scheme of secondary use of the waste lube oils would be of interest both for conservation of energy resources and for protection of environment. This paper discusses the secondary use for the used automotive lubricating oils. Process technology of Meinken, Mohawk and KTI were selected for the techno-economic feasibility study for re-refining used oil. Profitability analysis for each process is worked out and the results are compared. In many countries, the re-refining of used oils has become an important industry. The objective of recovering high quality raffinates is attained through the use of widely differing techniques. The processes concerned can be classified according to the chemical or physical method of used-oil pretreatment selected. Meinken process is based on chemical pretreatment, whereas both Mohawk and KTI processes employ physical methods involving distillation and eliminate the use of sulfuric acid, thus providing a facility for safer operation than Meinken. The plant capacity of two existing units in Jeddah are 10,000 TPA and 80,000 TPA re-refining of waste oil. We selected a plant of 50,000 TPA waste oil re-refining for economic study of these three processes. The authors wish to acknowledge the support from King Fahd University of Petroleum & Minerals and King Abdulaziz City for Science & Technology for this work.

Ali, F.M.; Hamdan, A.J.; Rahman, F. [King Fahd Univ. of Petroleum & Minerals, Dharan (Saudi Arabia)] [and others

1995-12-31T23:59:59.000Z

78

Potential of Establishment of Wind Farms in Western Province of Saudi Arabia  

Science Journals Connector (OSTI)

Abstract In the present study, the economic feasibility of development of 15 MW wind power plant (wind farm) at Taif, Western Province of the Kingdom of Saudi Arabia (K.S.A) has been investigated by analyzing long-term wind speed data. Western province has relatively better wind energy resources. Data analysis indicates that monthly average wind speeds of Taif (21 29’ N, 40 32’ E) range from 3.1 to 4.8 m/s at 10 m height. The wind farms simulated consist of different combinations of 600 kW commercial wind machines (50 m hub-height). NREL's (HOMER Energy's) HOMER software has been employed to perform the techno-economic assessment. The study presents monthly variations of wind speed, cumulative frequency distribution (CFD) profiles of wind speed, monthly and yearly amount of energy generated from the 15 MW wind farm (50 m hub-height), cost of generating energy (COE, $/kWh), capacity factor (%), etc. The CFD indicates that the wind speeds are less than 3 m/s for 46% of the time during the year. This implies that wind electric conversion systems (WECS) will not produce energy for about 46% of the time during the year. The annual energy produced by 15 MW wind farm (50 m hub-height) has been found to be 19939 MWh. The cost of wind-based electricity by using 600 kW (50m hub-height) commercial WECS has been found to be 0.0576 US$/kWh. With the development of 15 MW wind farm, about 453 tons/year of carbon emissions can be avoided entering into the local atmospheric. The paper also attempts to address various aspects (such as: effect of hub-height, etc.) of wind farm establishment

S.M. Shaahid; Luai M. Al-Hadhrami; M.K. Rahman

2014-01-01T23:59:59.000Z

79

Adaptive Gaussian Predictive Process Approximation Surya T Tokdar  

E-Print Network [OSTI]

exploration of Gaussian process models, including Bayesian treatments. For theoreti- cal details on commonAdaptive Gaussian Predictive Process Approximation Surya T Tokdar Duke University Abstract We address the issue of knots selection for Gaussian predictive process methodology. Predictive process

West, Mike

80

Sponsorship includes: Agriculture in the  

E-Print Network [OSTI]

Sponsorship includes: · Agriculture in the Classroom · Douglas County Farm Bureau · Gifford Farm · University of Nebraska Agricultural Research and Development Center · University of Nebraska- Lincoln Awareness Coalition is to help youth, primarily from urban communities, become aware of agriculture

Nebraska-Lincoln, University of

Note: This page contains sample records for the topic "arabia include approximately" 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

Ancilla Approximable Quantum State Transformations  

E-Print Network [OSTI]

We consider the transformations of quantum states obtainable by a process of the following sort. Combine the given input state with a specially prepared initial state of an auxiliary system. Apply a unitary transformation to the combined system. Measure the state of the auxiliary subsystem. If (and only if) it is in a specified final state, consider the process successful, and take the resulting state of the original (principal) system as the result of the process. We review known information about exact realization of transformations by such a process. Then we present results about approximate realization of finite partial transformations. We consider primarily the issue of approximation to within a specified positive epsilon, but we also address the question of arbitrarily close approximation.

Andreas Blass; Yuri Gurevich

2014-03-30T23:59:59.000Z

82

DHAHRAN 31261 SAUDI ARABIA www.kfupm.edu.sa/math/ E-mail: mathdept@kfupm.edu.sa King Fahd University of Petroleum & Minerals  

E-Print Network [OSTI]

University of Petroleum & Minerals DEPARTMENT OF MATHEMATICAL SCIENCES Technical Report Series TR 361 Oct: Department of Mathematics, Hafr Al-Batin Community College, King Fahd University of Petroleum and Minerals, P of Mathematical Sciences, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia, Email

Mustafa, M. Tahir

83

DHAHRAN 31261 SAUDI ARABIA www.kfupm.edu.sa/math/ E-mail: mathdept@kfupm.edu.sa King Fahd University of Petroleum & Minerals  

E-Print Network [OSTI]

University of Petroleum & Minerals DEPARTMENT OF MATHEMATICAL SCIENCES Technical Report Series TR 360 Oct: Department of Mathematics, Hafr Al-Batin Community College, King Fahd University of Petroleum and Minerals, P of Mathematical Sciences, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia, Email

Mustafa, M. Tahir

84

Economic feasibility of development of wind power plants in coastal locations of Saudi Arabia – A review  

Science Journals Connector (OSTI)

Climate change and depletion of natural resources are serious issues that have potential impact on the economic and social development of countries. In this perspective, the governments world-wide are mobilizing initiatives to exploit renewable energy sources to mitigate increasing demand of energy, volatile fuel prices, and environmental concerns. Renewable energy (wind/solar) based power system is a nature-friendly option for power production to foster sustainable development challenges. In the present study, the economic feasibility of development of 75 MW wind power plants (wind farms) in the coastal locations of the Kingdom of Saudi Arabia (K.S.A.) has been studied/reviewed by analyzing long-term wind speed data. Attention has been focused on four coastal locations (Al-Wajh, Jeddah, Yanbu and Jizan) covering the west coast. In general, long-term data indicates that the yearly average wind speed of K.S.A. varies from 3.0 to 4.5 m/s at 10 m height. The wind farms simulated consist of different combinations of 600 kW commercial wind machines (50 m hub-height). NREL's (HOMER Energy's) HOMER software has been employed to perform the techno-economic assessment. The study presents monthly variations of wind speed, cumulative frequency distribution (CFD) profiles of wind speed, monthly and yearly amount of energy generated from the 75 MW wind farms (50 m hub-height) at different coastal locations of K.S.A., cost of generating energy (COE, $/kWh), capacity factor (%), etc. The CFD indicates that the wind speeds are less than 3 m/s for 45%, 53%, 41%, and 52% of the time during the year at Al-Wajh, Jeddah, Yanbu and Jizan respectively. This implies that wind electric conversion systems (WECS) will not produce energy for about 41–53% of the time during the year. The annual energy produced by 75 MW wind farms (50 m hub-height) has been found to be 107,196, 81,648, 135,822, and 80,896 MWh at Al-Wajh, Jeddah, Yanbu and Jizan respectively. The cost of wind-based electricity by using 600 kW (50 m hub-height) commercial WECS has been found to be 0.0536, 0.0704, 0.0423, and 0.0711 US$/kWh for Al-Wajh, Jeddah, Yanbu and Jizan respectively. Also, attempt has been made to determine the capacity factor (CF) of wind-based power plants, the CF has been found to vary from 12% to 21% for different locations of the Kingdom.

S.M. Shaahid; L.M. Al-Hadhrami; M.K. Rahman

2013-01-01T23:59:59.000Z

85

Appendix F Cultural Resources, Including  

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

Appendix F Appendix F Cultural Resources, Including Section 106 Consultation STATE OF CALIFORNIA - THE RESOURCES AGENCY EDMUND G. BROWN, JR., Governor OFFICE OF HISTORIC PRESERVATION DEPARTMENT OF PARKS AND RECREATION 1725 23 rd Street, Suite 100 SACRAMENTO, CA 95816-7100 (916) 445-7000 Fax: (916) 445-7053 calshpo@parks.ca.gov www.ohp.parks.ca.gov June 14, 2011 Reply in Reference To: DOE110407A Angela Colamaria Loan Programs Office Environmental Compliance Division Department of Energy 1000 Independence Ave SW, LP-10 Washington, DC 20585 Re: Topaz Solar Farm, San Luis Obispo County, California Dear Ms. Colamaria: Thank you for seeking my consultation regarding the above noted undertaking. Pursuant to 36 CFR Part 800 (as amended 8-05-04) regulations implementing Section

86

Countries Gasoline Prices Including Taxes  

Gasoline and Diesel Fuel Update (EIA)

Countries (U.S. dollars per gallon, including taxes) Countries (U.S. dollars per gallon, including taxes) Date Belgium France Germany Italy Netherlands UK US 01/13/14 7.83 7.76 7.90 8.91 8.76 8.11 3.68 01/06/14 8.00 7.78 7.94 8.92 8.74 8.09 3.69 12/30/13 NA NA NA NA NA NA 3.68 12/23/13 NA NA NA NA NA NA 3.63 12/16/13 7.86 7.79 8.05 9.00 8.78 8.08 3.61 12/9/13 7.95 7.81 8.14 8.99 8.80 8.12 3.63 12/2/13 7.91 7.68 8.07 8.85 8.68 8.08 3.64 11/25/13 7.69 7.61 8.07 8.77 8.63 7.97 3.65 11/18/13 7.99 7.54 8.00 8.70 8.57 7.92 3.57 11/11/13 7.63 7.44 7.79 8.63 8.46 7.85 3.55 11/4/13 7.70 7.51 7.98 8.70 8.59 7.86 3.61 10/28/13 8.02 7.74 8.08 8.96 8.79 8.04 3.64 10/21/13 7.91 7.71 8.11 8.94 8.80 8.05 3.70 10/14/13 7.88 7.62 8.05 8.87 8.74 7.97 3.69

87

Approximate Method for the Free Energy  

Science Journals Connector (OSTI)

......Articles Approximate Method for the Free Energy Akihide Oguchi Department of Physics...a lower bound of the Helmholtz free energy in the statistical physics. A new approximate expression of the free energy is obtained. This approximate......

Akihide Oguchi

1976-11-01T23:59:59.000Z

88

Approximate convex decomposition and its applications  

E-Print Network [OSTI]

in representations with an unmanageable number of components. In this work, we have developed an approximate technique, called Approximate Convex Decomposition (ACD), which decomposes a given polygon or polyhedron into "approximately convex" pieces that may provide...

Lien, Jyh-Ming

2009-05-15T23:59:59.000Z

89

Approximating Metal-Insulator Transitions  

E-Print Network [OSTI]

We consider quantum wave propagation in one-dimensional quasiperiodic lattices. We propose an iterative construction of quasiperiodic potentials from sequences of potentials with increasing spatial period. At each finite iteration step the eigenstates reflect the properties of the limiting quasiperiodic potential properties up to a controlled maximum system size. We then observe approximate metal-insulator transitions (MIT) at the finite iteration steps. We also report evidence on mobility edges which are at variance to the celebrated Aubry-Andre model. The dynamics near the MIT shows a critical slowing down of the ballistic group velocity in the metallic phase similar to the divergence of the localization length in the insulating phase.

C. Danieli; K. Rayanov; B. Pavlov; G. Martin; S. Flach

2014-05-06T23:59:59.000Z

90

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

91

This paper was prepared for presentation at the 2005 SPE Technical Symposium of Saudi Arabia Section held in Dhahran, Saudi Arabia, 14-16 May 2005.  

E-Print Network [OSTI]

. Controllable factors include mud weight, wellbore azimuth and inclination. A proper drilling program optimizes by the Technical Symposium Program Committee following review of information contained in full manuscript submitted a platform. Drilling an ingauge hole is an interplay of two factors: uncontrollable and controllable

Al-Majed, Abdulaziz Abdullah

92

E-Print Network 3.0 - approximate block newton Sample Search...  

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

, including both approximate-Newton2 and inexact-Newton3 approaches. The generalized mini- mal residual (GMRES... A Newton-Krylov Algorithm for the Euler Equations Using...

93

ORIGINAL ARTICLE Approximate Truth and Descriptive Nesting  

E-Print Network [OSTI]

ORIGINAL ARTICLE Approximate Truth and Descriptive Nesting Jeffrey Alan Barrett Received: 7 July. This paper presents a notion of local probable approximate truth in terms of descriptive nesting relations

Barrett, Jeffrey A.

94

Multi topological approximations of rough set theory  

Science Journals Connector (OSTI)

In this paper, we generalise Pawlak's approximation spaces to topological approximation spaces. These topological approximation spaces are generated using many topological notions such as regular open sets, semi-open sets, pre-open sets, ?-open sets, ?-open sets and ?-open sets and others. The basic definitions and properties of these topological approximation spaces are introduced and sufficiently illustrated. We put all topological generalisations in one generalisation called m-generalisation spaces.

A.S. Salama; O.G. El-Barbary

2013-01-01T23:59:59.000Z

95

Approximation Algorithms for Maximization Problems arising in  

E-Print Network [OSTI]

Approximation Algorithms for Maximization Problems arising in Graph Partitioning Thesis for the M of size k that maximizes : Max­k­Vertex Cover : the weight of edges incident with vertices in U . Max a number of approximation algorithms based on linear and semidefinite programming, and obtain approximation

Langberg, Michael

96

Direct Observation of Born-Oppenheimer Approximation  

E-Print Network [OSTI]

Direct Observation of Born-Oppenheimer Approximation Breakdown in Carbon Nanotubes Adam W of the theoretically predicted breakdown of the Born-Oppenheimer approximation in individual single-walled carbon nanotubes. The Born-Oppenheimer (BO) or adiabatic approximation is widely used to simplify the very complex

Cronin, Steve

97

Mathematical Analysis of Born{Oppenheimer Approximations  

E-Print Network [OSTI]

Mathematical Analysis of Born{Oppenheimer Approximations George A. Hagedorn and Alain Joye concerning Born{Oppenheimer approximations in molecular quantum mechanics. Introduction The goal of this paper is to review rigorous mathematical results concerning Born{Oppenheimer approximations. We make

Hagedorn, George A.

98

Truth approximation via abductive belief change  

Science Journals Connector (OSTI)

......in Model-Based Reasoning and Abduction Truth approximation via abductive belief change...of belief change, on the one hand, and truth approximation, construed as increasing...or beliefs does lead them closer to the truth, and hence tracks truth approximation......

Gustavo Cevolani

2013-12-01T23:59:59.000Z

99

Methods of producing adsorption media including a metal oxide  

DOE Patents [OSTI]

Methods of producing a metal oxide are disclosed. The method comprises dissolving a metal salt in a reaction solvent to form a metal salt/reaction solvent solution. The metal salt is converted to a metal oxide and a caustic solution is added to the metal oxide/reaction solvent solution to adjust the pH of the metal oxide/reaction solvent solution to less than approximately 7.0. The metal oxide is precipitated and recovered. A method of producing adsorption media including the metal oxide is also disclosed, as is a precursor of an active component including particles of a metal oxide.

Mann, Nicholas R; Tranter, Troy J

2014-03-04T23:59:59.000Z

100

A13B-0215: Case study of the 9 April 2009 `brown' cloud: Observations of unusually high cloud droplet concentrations in Saudi Arabia, David J Delene, University of North Dakota (delene@aero.und.edu; http://aerosol.atmos.und.edu)  

E-Print Network [OSTI]

' cloud: Observations of unusually high cloud droplet concentrations in Saudi Arabia, David J Delene accumulation on the unprotected leading edge of the aircraft's wing during the 9 April 2009 research in Saudi diameters compared to a normal cell. Cloud base CCN measurements in Saudi Arabia are variable with some

Delene, David J.

Note: This page contains sample records for the topic "arabia include approximately" 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

Cesium and strontium extraction using a mixed extractant solvent including crown ether and calixarene extractants  

DOE Patents [OSTI]

A mixed extractant solvent including calix[4]arene-bis-(tert-octylbenzo)-crown-6 ("BOBCalixC6"), 4',4',(5')-di-(t-butyldicyclo-hexano)-18-crown-6 ("DtBu18C6"), and at least one modifier dissolved in a diluent. The mixed extractant solvent may be used to remove cesium and strontium from an acidic solution. The DtBu18C6 may be present from approximately 0.01 M to approximately 0.4M, such as from approximately 0.086 M to approximately 0.108 M. The modifier may be 1-(2,2,3,3-tetrafluoropropoxy)-3-(4-sec-butylphenoxy)-2-propanol ("Cs-7SB") and may be present from approximately 0.01M to approximately 0.8M. In one embodiment, the mixed extractant solvent includes approximately 0.15M DtBu18C6, approximately 0.007M BOBCalixC6, and approximately 0.75M Cs-7SB modifier dissolved in an isoparaffinic hydrocarbon diluent. The mixed extractant solvent may form an organic phase in an extraction system that also includes an aqueous phase. Methods of extracting cesium and strontium as well as strontium alone are also disclosed.

Meikrantz, David H. (Idaho Falls, ID); Todd, Terry A. (Aberdeen, ID); Riddle, Catherine L. (Idaho Falls, ID); Law, Jack D. (Pocatello, ID); Peterman, Dean R. (Idaho Falls, ID); Mincher, Bruce J. (Idaho Falls, ID); McGrath, Christopher A. (Blackfoot, ID); Baker, John D. (Blackfoot, ID)

2007-11-06T23:59:59.000Z

102

Estimate sequence methods: extensions and approximations  

E-Print Network [OSTI]

Aug 11, 2009 ... Estimate sequence methods: extensions and approximations ... or both, and draw some guidelines on the design of further estimate sequence ...

Michel Baes

2009-08-11T23:59:59.000Z

103

Born-Oppenheimer approximation in open systems  

E-Print Network [OSTI]

We generalize the standard Born-Oppenheimer approximation to the case of open quantum systems. We define the zeroth order Born-Oppenheimer approximation of an open quantum system as the regime in which its effective Hamiltonian can be diagonalized with fixed slowly changing variables. We then establish validity and invalidity conditions for this approximation for two kinds of dissipations--the spin relaxation and the dissipation of center-of-mass motion. As an example, the Born-Oppenheimer approximation of a two-level open system is analyzed.

X. L. Huang; X. X. Yi

2009-09-16T23:59:59.000Z

104

Born-Oppenheimer approximation in open systems  

Science Journals Connector (OSTI)

We generalize the standard Born-Oppenheimer approximation to the case of open quantum systems. We define the zeroth-order Born-Oppenheimer approximation for an open quantum system as the regime in which its effective Hamiltonian can be diagonalized with fixed slowly changing variables. We then establish validity and invalidity conditions for this approximation for two types of dissipations—the spin relaxation and the dissipation of center-of-mass motion. As an example, the Born-Oppenheimer approximation for a two-level open system is analyzed.

X. L. Huang and X. X. Yi

2009-09-11T23:59:59.000Z

105

Approximate von Neumann entropy for directed graphs  

Science Journals Connector (OSTI)

In this paper, we develop an entropy measure for assessing the structural complexity of directed graphs. Although there are many existing alternative measures for quantifying the structural properties of undirected graphs, there are relatively few corresponding measures for directed graphs. To fill this gap in the literature, we explore an alternative technique that is applicable to directed graphs. We commence by using Chung's generalization of the Laplacian of a directed graph to extend the computation of von Neumann entropy from undirected to directed graphs. We provide a simplified form of the entropy which can be expressed in terms of simple node in-degree and out-degree statistics. Moreover, we find approximate forms of the von Neumann entropy that apply to both weakly and strongly directed graphs, and that can be used to characterize network structure. We illustrate the usefulness of these simplified entropy forms defined in this paper on both artificial and real-world data sets, including structures from protein databases and high energy physics theory citation networks.

Cheng Ye; Richard C. Wilson; César H. Comin; Luciano da F. Costa; Edwin R. Hancock

2014-05-12T23:59:59.000Z

106

Quasipotential Equation Corresponding to the Relativistic Eikonal Approximation  

Science Journals Connector (OSTI)

A three-dimensional Lippmann-Schwinger-type equation for the elastic scattering amplitude and the corresponding homogeneous Schrödinger equation for the two-particle bound states are studied. The potential is defined as an infinite power series in the coupling constant which fits the perturbative expansion of the on-energy-shell scattering amplitude. The approximate equation obtained by keeping only the lowest-order term in the potential is local and has the following properties: (i) The scattering amplitude yields the relativistic eikonal approximation for large energies or small exchanged mass and momentum transfer; (ii) for the Coulomb problem the approximate equation is exactly soluble and leads to a relativistic Balmer formula including the fine-structure splitting.

I. T. Todorov

1971-05-15T23:59:59.000Z

107

Variational principles with Padé approximants for tearing mode analysis  

SciTech Connect (OSTI)

Tearing modes occur in several distinct physical regimes, and it is often important to compute the inner layer response for these modes with various effects. There is a need for an approximate and efficient method of solving the inner layer equations in all these regimes. In this paper, we introduce a method of solving the inner layer equations based on using a variational principle with Padé approximants. For all the regimes considered, the main layer equations to be solved are inhomogeneous, and Padé approximants give a convenient and efficient method of satisfying the correct asymptotic behavior at the edge of the layer. Results using this variational principle—Padé approximant method in three of these regimes is presented. These regimes are the constant-? resistive-inertial (RI) regime, the constant-? viscoresistive regime, and the non-constant-? inviscid tearing regime. The last regime includes the constant-? RI regime and the inertial regime. The results show that reasonable accuracy can be obtained very efficiently with Padé approximants having a small number of parameters.

Cole, Andrew J. [Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027 (United States)] [Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027 (United States); Finn, John M. [Applied Mathematics and Plasma Physics, Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87544 (United States)] [Applied Mathematics and Plasma Physics, Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87544 (United States)

2014-03-15T23:59:59.000Z

108

The Observer Algorithm for Visibility Approximation  

E-Print Network [OSTI]

other algorithms do. We test this algorithm in several settings: rural, mountainous and urban areasThe Observer Algorithm for Visibility Approximation Per-Magnus OLSSON a and Patrick DOHERTY present a novel algorithm for visibility approximation that is sub- stantially faster than ray casting

Doherty, Patrick

109

APPROXIMATE TAXI FARES From Midway -$35  

E-Print Network [OSTI]

APPROXIMATE TAXI FARES From Midway - $35 From O'Hare - $60 From Downtown - $35 MIDWAY Midway International Airport is approximately eight miles west of the University of Chicago campus. Midway is easily transportation, shuttle, car, and taxi. FROM MIDWAY AIRPORT Follow the airport signs to the CTA Orange Line

Issa, Naoum

110

Optimal Tree Approximation with Wavelets Richard Baraniuk  

E-Print Network [OSTI]

simply represented: the energy from a singularity localizes along one branch of the tree (see Figure 1Optimal Tree Approximation with Wavelets Richard Baraniuk Department of Electrical and Computer on trees and point out that an optimal tree approximant exists and is easily computed. The optimal tree

111

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

112

The effect of component efficiency and operating conditions on the 50-kW dish Stirling system in Riyadh, Saudia Arabia  

SciTech Connect (OSTI)

This paper deals with the development of a weather data base and the performance prediction of a 50-kW dish Stirling system. An analysis of direct solar insolation data for 1985 from the site in Riyadh, Saudi Arabia was made to determine the available solar energy. A parameter study was done of the effects of component efficiencies and operating conditions on instantaneous and yearly average system efficiency using the prepared weather data. The system performance was found to be most affected by wind, mirror reflectivity, and exact placement of the receiver in the focal point of the mirror.

Noyes, G.W. (Deutsche Forshungsanstait fur Luft-und Raumfahrt, Inst. fur Technische Thermodynamik, Pfaffenwaldrign 38-40, 7000 Stuttgart 80 (DE))

1990-11-01T23:59:59.000Z

113

Modeling and optimization of hybrid wind–solar-powered reverse osmosis water desalination system in Saudi Arabia  

Science Journals Connector (OSTI)

Abstract A hybrid wind/solar powered reverse osmosis desalination system has been modeled and simulated. The results of the simulation have been used to optimize the system for the minimum cost per cubic meter of the desalinated water. The performance of the hybrid wind/solar powered RO system has been analyzed under Dhahran, Saudi Arabia, weather data for a typical year. The performance has been evaluated under a constant RO load of 1 kW for 12 h/day and 24 h/day. The simulation results revealed that the optimum system that powers a 1-kW RO system for 12 h/day that yields a minimum levelized cost of energy comprises 2 wind turbines, 40 \\{PVs\\} modules and 6 batteries and the levelized cost of energy of such system is found to be 0.624 $/kW h. On the other hand, for a load of 1-kW for 24 h/day, the optimum system consists of 6 wind turbines, 66 \\{PVs\\} modules and 16 batteries with a minimum levelized cost of energy 0.672 $/kW h. Depending on the salinity of the raw water, the energy consumption for desalination ranges between 8 and 20 kW h/m3. This means that the cost of using the proposed optimum hybrid wind/solar system for water desalination will range between $3.693/m3 and $3. 812/m3 which is less than the range reported in the literature.

Esmail M.A. Mokheimer; Ahmet Z. Sahin; Abdullah Al-Sharafi; Ahmad I. Ali

2013-01-01T23:59:59.000Z

114

The Boussinesq approximation in rapidly rotating flows  

E-Print Network [OSTI]

In the classical formulation of the Boussinesq approximation centrifugal buoyancy effects related to differential rotation, as well as strong vortices in the flow, are neglected. However, these may play an important role in rapidly rotating flows, such as in astrophysical and geophysical applications, and also in turbulent convection. We here provide a straightforward approach resulting in a Boussinesq-type approximation that consistently accounts for centrifugal effects. We further compare our new approach to the classical one in fluid flows confined between two differentially heated and rotating cylinders. The results justify the need of using the proposed approximation in rapidly rotating flows.

Lopez, Jose M; Avila, Marc

2013-01-01T23:59:59.000Z

115

Approximate Stokes Drift Profiles in Deep Water  

Science Journals Connector (OSTI)

A deep-water approximation of the Stokes drift velocity profile is explored as an alternative to the monochromatic profile. The alternative profile investigated relies on the same two quantities required for the monochromatic profile, namely, the ...

Øyvind Breivik; Peter A. E. M. Janssen; Jean-Raymond Bidlot

2014-09-01T23:59:59.000Z

116

Quasiclassical Approximation for Slow Neutron Scattering  

Science Journals Connector (OSTI)

......Approximation for Slow Neutron Scattering Takeo Nishigori Department...formula for the differential scattering cross section of a slow neutron is derived along the line...of Spherical Rotors and Neutron Scattering Juichiro Hama and Tuto......

Takeo Nishigori

1970-06-01T23:59:59.000Z

117

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

118

On the Born-Oppenheimer approximation  

Science Journals Connector (OSTI)

We discuss the validity of the Born-Oppenheimer approximation for molecular levels. It is shown...1/4...and prescriptions are given for their calculation. In particular to fourth order some adiabatic corrections ...

J. M. Combes

1975-01-01T23:59:59.000Z

119

NONLINEAR APPROXIMATIONS FOR ELECTRONIC STRUCTURE CALCULATIONS  

E-Print Network [OSTI]

NONLINEAR APPROXIMATIONS FOR ELECTRONIC STRUCTURE CALCULATIONS G. BEYLKIN AND T. S. HAUT Abstract. We present a new method for electronic structure calculations based on novel algorithms for nonlinear numerical calculus suitable for electronic structure calculations. For any spatial orbital

Beylkin, Gregory

120

Approximate inference in Gaussian graphical models  

E-Print Network [OSTI]

The focus of this thesis is approximate inference in Gaussian graphical models. A graphical model is a family of probability distributions in which the structure of interactions among the random variables is captured by a ...

Malioutov, Dmitry M., 1981-

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "arabia include approximately" 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

A fresh look at the adhesion approximation  

E-Print Network [OSTI]

I report on a systematic derivation of the phenomenological ``adhesion approximation'' from gravitational instability together with a brief evaluation of the related status of analytical modeling of large-scale structure.

Thomas Buchert

1997-11-04T23:59:59.000Z

122

An improved proximity force approximation for electrostatics  

SciTech Connect (OSTI)

A quite straightforward approximation for the electrostatic interaction between two perfectly conducting surfaces suggests itself when the distance between them is much smaller than the characteristic lengths associated with their shapes. Indeed, in the so called 'proximity force approximation' the electrostatic force is evaluated by first dividing each surface into a set of small flat patches, and then adding up the forces due two opposite pairs, the contributions of which are approximated as due to pairs of parallel planes. This approximation has been widely and successfully applied in different contexts, ranging from nuclear physics to Casimir effect calculations. We present here an improvement on this approximation, based on a derivative expansion for the electrostatic energy contained between the surfaces. The results obtained could be useful for discussing the geometric dependence of the electrostatic force, and also as a convenient benchmark for numerical analyses of the tip-sample electrostatic interaction in atomic force microscopes. - Highlights: Black-Right-Pointing-Pointer The proximity force approximation (PFA) has been widely used in different areas. Black-Right-Pointing-Pointer The PFA can be improved using a derivative expansion in the shape of the surfaces. Black-Right-Pointing-Pointer We use the improved PFA to compute electrostatic forces between conductors. Black-Right-Pointing-Pointer The results can be used as an analytic benchmark for numerical calculations in AFM. Black-Right-Pointing-Pointer Insight is provided for people who use the PFA to compute nuclear and Casimir forces.

Fosco, Cesar D. [Centro Atomico Bariloche, Comision Nacional de Energia Atomica, R8402AGP Bariloche (Argentina) [Centro Atomico Bariloche, Comision Nacional de Energia Atomica, R8402AGP Bariloche (Argentina); Instituto Balseiro, Universidad Nacional de Cuyo, R8402AGP Bariloche (Argentina); Lombardo, Fernando C. [Departamento de Fisica Juan Jose Giambiagi, FCEyN UBA, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Pabellon I, 1428 Buenos Aires (Argentina) [Departamento de Fisica Juan Jose Giambiagi, FCEyN UBA, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Pabellon I, 1428 Buenos Aires (Argentina); IFIBA (Argentina)] [Argentina; Mazzitelli, Francisco D., E-mail: fdmazzi@cab.cnea.gov.ar [Centro Atomico Bariloche, Comision Nacional de Energia Atomica, R8402AGP Bariloche (Argentina); Departamento de Fisica Juan Jose Giambiagi, FCEyN UBA, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Pabellon I, 1428 Buenos Aires (Argentina)

2012-08-15T23:59:59.000Z

123

Extended quasiparticle approximation and Brueckner theory  

Science Journals Connector (OSTI)

The time-dependent Green’s function method provides a basic theory for nuclear dynamics and heavy-ion collisions. The spectral function plays an important role in this theory containing information on correlations in the medium. These are usually neglected by using a quasiparticle approximation. In order to evaluate this particular approach it is important to establish in the static limit a link between this method and other traditional nuclear many-body theories such as the Brueckner approach. Using a self-consistent T-matrix approximation for the self-energy in the Green’s-function approach, treating particles and holes on equal footing, the self-energy can be obtained and compared with the Brueckner expression. In the quasiparticle limit it contains terms up to and analogous to the Brueckner second order rearrangement energy. In an extended quasiparticle approximation (EQP) which does not violate the sum rule for the spectral function the Brueckner third-order rearrangement energy can also be reproduced. The latter approximation constitutes a bridge between the Brueckner and Green’s-function methods. It assumes small absorption (and energy dependence) of the mean field. Some numerical estimates of the different approximation schemes that we discuss are shown. An iteration scheme for applying the EQP approximation is suggested.

H. S. Köhler and Rudi Malfliet

1993-09-01T23:59:59.000Z

124

Net Taxable Gasoline Gallons (Including Aviation Gasoline)  

E-Print Network [OSTI]

Net Taxable Gasoline Gallons (Including Aviation Gasoline) Period 2000 2001 (2) 2002 2003 2004 "gross" to "net" , was deemed impractical. (5) This report replaces the Gross Taxable Gasoline Gallons (Including Aviation Gasoline) report which will not be produced after December 2002. (6) The November 2007

125

Levinson?modified Born approximation as applied to the spherical square well and to Mie theory  

Science Journals Connector (OSTI)

A modified Born approximation for the spherical square well incorporating Levinson’s theorem and adjusted energies extends the range of validity of the conventional Born approximation to include intermediate incident energies and well depths. These modifications also result in accurate Mie phase shifts for the electromagnetic case for similar ranges of incident energies and effective (or pseudo?) well depths.

David E. Stein; Alex E. S. Green

1982-01-01T23:59:59.000Z

126

On Corrections to the Born-Oppenheimer Approximation  

E-Print Network [OSTI]

This report presents a new approach for treating the coupling of electrons and nuclei in quantum mechanical calculations for molecules and condensed matter. It includes the standard "Born-Oppenheimer approximation" as a special case but treats both adiabatic and non-adiabatic corrections using perturbation theory. The adiabatic corrections include all terms that do not explicitly involve the nuclear wavefunctions, so that the nuclei move on a single electronic potential surface. The non-adiabatic corrections, which allow the nuclei to move on more than one potential surface, include coupling between the electronic and nuclear wavefunctions. The method is related to an approach first proposed by Born and Huang, but it differs in the methodology and in the definition of the electronic wavefunctions and potential surfaces. A simple example is worked out to illustrate the mechanics of the technique. The report also includes a review of previous work.

Gerald I. Kerley

2013-06-24T23:59:59.000Z

127

Gas storage materials, including hydrogen storage materials  

DOE Patents [OSTI]

A material for the storage and release of gases comprises a plurality of hollow elements, each hollow element comprising a porous wall enclosing an interior cavity, the interior cavity including structures of a solid-state storage material. In particular examples, the storage material is a hydrogen storage material, such as a solid state hydride. An improved method for forming such materials includes the solution diffusion of a storage material solution through a porous wall of a hollow element into an interior cavity.

Mohtadi, Rana F; Wicks, George G; Heung, Leung K; Nakamura, Kenji

2014-11-25T23:59:59.000Z

128

Approximating European Options by Rebate Barrier Options  

E-Print Network [OSTI]

When the underlying stock price is a strict local martingale process under an equivalent local martingale measure, Black-Scholes PDE associated with an European option may have multiple solutions. In this paper, we study an approximation for the smallest hedging price of such an European option. Our results show that a class of rebate barrier options can be used for this approximation, when its rebate and barrier are chosen appropriately. An asymptotic convergence rate is also achieved when the knocked-out barrier moves to infinity under suitable conditions.

Song, Qingshuo

2011-01-01T23:59:59.000Z

129

Stochastic Approximation and Its Application in MCMC  

E-Print Network [OSTI]

) is known as observational noise, which is de ned as follows: t+1 = H t+1( t; xt+1) h t+1( t); In 1951, Robin and Monro introduced the so-called Robbins - Monro algorithm (1951) to solve the integration equation and the algorithm works as follows...: Algorithm 1.1.1. Stochastic Approximation 1 a. Generate Xt+1 g t(x), where t indexes the iteration. b. Set t+1 = t + atH( t; Xt+1), where at is the gain factor. This Robbins a^ Monro algorithm is the most popular stochastic approximation method used...

Cheng, Yichen

2013-05-31T23:59:59.000Z

130

Intentionally Including - Engaging Minorities in Physics Careers |  

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

Intentionally Including - Engaging Minorities in Physics Careers Intentionally Including - Engaging Minorities in Physics Careers Intentionally Including - Engaging Minorities in Physics Careers April 24, 2013 - 4:37pm Addthis Joining Director Dot Harris (second from left) were Marlene Kaplan, the Deputy Director of Education and director of EPP, National Oceanic and Atmospheric Administration, Claudia Rankins, a Program Officer with the National Science Foundation and Jim Stith, the past Vice-President of the American Institute of Physics Resources. Joining Director Dot Harris (second from left) were Marlene Kaplan, the Deputy Director of Education and director of EPP, National Oceanic and Atmospheric Administration, Claudia Rankins, a Program Officer with the National Science Foundation and Jim Stith, the past Vice-President of the

131

Scramjet including integrated inlet and combustor  

SciTech Connect (OSTI)

This patent describes a scramjet engine. It comprises: a first surface including an aft facing step; a cowl including: a leading edge and a trailing edge; an upper surface and a lower surface extending between the leading edge and the trailing edge; the cowl upper surface being spaced from and generally parallel to the first surface to define an integrated inlet-combustor therebetween having an inlet for receiving and channeling into the inlet-combustor supersonic inlet airflow; means for injecting fuel into the inlet-combustor at the step for mixing with the supersonic inlet airflow for generating supersonic combustion gases; and further including a spaced pari of sidewalls extending between the first surface to the cowl upper surface and wherein the integrated inlet-combustor is generally rectangular and defined by the sidewall pair, the first surface and the cowl upper surface.

Kutschenreuter, P.H. Jr.; Blanton, J.C.

1992-02-04T23:59:59.000Z

132

Transmission line including support means with barriers  

DOE Patents [OSTI]

A gas insulated transmission line includes an elongated outer sheath, a plurality of inner conductors disposed within and extending along the outer sheath, and an insulating gas which electrically insulates the inner conductors from the outer sheath. A support insulator insulatably supports the inner conductors within the outer sheath, with the support insulator comprising a main body portion including a plurality of legs extending to the outer sheath, and barrier portions which extend between the legs. The barrier portions have openings therein adjacent the main body portion through which the inner conductors extend.

Cookson, Alan H. (Pittsburgh, PA)

1982-01-01T23:59:59.000Z

133

Energy Consumption of Personal Computing Including Portable  

E-Print Network [OSTI]

Energy Consumption of Personal Computing Including Portable Communication Devices Pavel Somavat1 consumption, questions are being asked about the energy contribution of computing equipment. Al- though studies have documented the share of energy consumption by this type of equipment over the years, research

Namboodiri, Vinod

134

EE Regional Technology Roadmap Includes comparison  

E-Print Network [OSTI]

EE Regional Technology Roadmap Includes comparison against 6th Power Plan (Update cyclically Roadmap with a strong linkage to utility programs Scan for Technologies 1. How does it address the NW Data Clearinghouse BPA/RTF NEEA/Regional Programs Group Update Regional EE Technology Roadmap Lighting

135

Video Topics Include Freshman Inquiry Course  

E-Print Network [OSTI]

Video Topics Include Freshman Inquiry Course Open Advisement/ Group Advisement Dinning Campus: End of Spring 2012, Commencement May 18: Grades available on MAX after 4:30pm AdvisementYouTubeVideoSeries I N S I D E T H I S I S S U E : YouTube Video Series 1 Mark Your Calendar 1 Exploring Major Tips 2

Hardy, Christopher R.

136

Including Ocean Model Uncertainties in Climate Predictions  

E-Print Network [OSTI]

Including Ocean Model Uncertainties in Climate Predictions Chris Brierley, Alan Thorpe, Mat Collins's to perform the integrations Currently uses a `slab' ocean #12;An Ocean Model Required to accurately model transient behaviour Will have its own uncertainties Requires even more computing power Create new models

Jones, Peter JS

137

APPROXIMATION ALGORITHMS FOR CLUSTERING A Dissertation  

E-Print Network [OSTI]

develop new algorithmic techniques that will find application in a wide range of settings. We consider problems such as the stochastic versions of the set cover, vertex cover, and facility location problemsAPPROXIMATION ALGORITHMS FOR CLUSTERING PROBLEMS A Dissertation Presented to the Faculty

Swamy, Chaitanya

138

Symbolic Test Selection Based on Approximate Analysis  

E-Print Network [OSTI]

Symbolic Test Selection Based on Approximate Analysis Bertrand Jeannet, Thierry J´eron, Vlad Rusu}@irisa.fr Abstract. This paper addresses the problem of generating symbolic test cases for testing the conformance. The challenge we consider is the selection of test cases according to a test purpose, which is here a set

Paris-Sud XI, Université de

139

Approximate Relational Reasoning by Stochastic Propositionalization  

E-Print Network [OSTI]

Approximate Relational Reasoning by Stochastic Propositionalization Nicola Di Mauro, Teresa M fold recognition Nicola Di Mauro · Teresa M.A. Basile · Stefano Ferilli · Floriana Esposito Department.com c Springer-Verlag Berlin Heidelberg 2010 #12;82 N. Di Mauro et al. and drug design are relational

Di Mauro, Nicola

140

Correcting the diffusion approximation at the boundary  

E-Print Network [OSTI]

, 2011 The diffusion approximation to the radiative transport equation applies for light that has solutions of the radiative transport equation to evaluate each of their accuracy. Nonetheless, nearly all transport equation · I þ aI þ sLI ¼ 0; ð1:1� governs continuous light propagation in tissues [1

Kim, Arnold D.

Note: This page contains sample records for the topic "arabia include approximately" 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

Approximated Distributions of Sampling Inequality Indices  

Science Journals Connector (OSTI)

Often, in finite samples, the true level of the confidence intervals for natural estimators of inequality indices belonging to the Gini family differs greatly from their nominal level, which is based on the asymptotic confidence limits. This paper ... Keywords: Gini index family, Gram-Charlier approximation, Monte Carlo experiment, algebraic computer software, income distribution

Paola Palmitesta; Corrado Provasi; Cosimo Spera

1999-06-01T23:59:59.000Z

142

Buildings Included on EMS Reports"  

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

Office of Legacy Management Office of Legacy Management Buildings Included on EMS Reports" "Site","Property Name","Property ID","GSF","Incl. in Water Baseline (CY2007)","Water Baseline (sq. ft.)","Water CY2008 (sq. ft.)","Water CY2009 (sq. ft.)","Water Notes","Incl. in Energy Baseline (CY2003)","Energy Baseline (sq. ft.)","CY2008 Energy (sq. ft.)","CY2009 Energy (sq. ft.)","Energy Notes","Included as Existing Building","CY2008 Existing Building (sq. ft.)","Reason for Building Exclusion" "Column Totals",,"Totals",115139,,10579,10579,22512,,,3183365,26374,115374,,,99476 "Durango, CO, Disposal/Processing Site","STORAGE SHED","DUD-BLDG-STORSHED",100,"no",,,,,"no",,,,"OSF","no",,"Less than 5,000 GSF"

143

Power generation method including membrane separation  

DOE Patents [OSTI]

A method for generating electric power, such as at, or close to, natural gas fields. The method includes conditioning natural gas containing C.sub.3+ hydrocarbons and/or acid gas by means of a membrane separation step. This step creates a leaner, sweeter, drier gas, which is then used as combustion fuel to run a turbine, which is in turn used for power generation.

Lokhandwala, Kaaeid A. (Union City, CA)

2000-01-01T23:59:59.000Z

144

Completion strategy includes clay and precipitate control  

SciTech Connect (OSTI)

This article describes the conditions which are necessary for a successful oil well completion in the Mississippi and Cherokee zones of South Central Kansas. Topics considered include paraffin precipitation, clay swelling and migration, and iron precipitation. Clays in these zones are sensitive to water-base treating fluids and tend to swell and migrate to the well bore, thereby causing permeability damage. The presence of iron in the Mississippi and Cherokee formations has been indicated by cuttings, core samples, and connate water samples.

Sandy, T.; Gardner, G.R.

1985-05-06T23:59:59.000Z

145

Jet-calculus approach including coherence effects  

Science Journals Connector (OSTI)

We show how integrodifferential equations typical of jet calculus can be combined with an averaging procedure to obtain jet-calculus-based results including the Mueller interference graphs. Results in longitudinal-momentum fraction x for physical quantities are higher at intermediate x and lower at large x than with the conventional ‘‘incoherent’’ jet calculus. These results resemble those of Marchesini and Webber, who used a Monte Carlo approach based on the same dynamics.

L. M. Jones; R. Migneron; K. S. S. Narayanan

1987-01-01T23:59:59.000Z

146

Vibrational Superposition States Without Rotating Wave Approximation  

E-Print Network [OSTI]

We propose a scheme to generate superpositions of coherent states for the vibrational motion of a laser cooled trapped-ion. It is based on the interaction with a standing wave making use of the counter-rotating terms, i.e. not applying the rotating wave approximation. We also show that the same scheme can be exploited for quantum state measurement, i.e. with the same scheme non-classical states may be reconstructed

Mancini, S; Tombesi, P

2000-01-01T23:59:59.000Z

147

Limit theorems for stochastic approximation algorithms  

E-Print Network [OSTI]

We prove a central limit theorem applicable to one dimensional stochastic approximation algorithms that converge to a point where the error terms of the algorithm do not vanish. We show how this applies to a certain class of these algorithms that in particular covers a generalized P\\'olya urn model, which is also discussed. In addition, we show how to scale these algorithms in some cases where we cannot determine the limiting distribution but expect it to be non-normal.

Renlund, Henrik

2011-01-01T23:59:59.000Z

148

Covering based approximation – a new type approach  

Science Journals Connector (OSTI)

The rough set theory, proposed by Pawlak is termed as basic (traditional) rough set theory and it has been extended in many directions. Covering based rough set is one of the extensions of the basic rough set theory. A covering is a generalisation of notion of partitioned rough set (Pawalk rough set) introduced by W. Zakowski. In this article it is introduced a new type of covering-based rough set in which both lower and upper approximation operators are improved.

Debadutta Mohanty

2010-01-01T23:59:59.000Z

149

Automating Logic Rectification by Approximate SPFDs  

Science Journals Connector (OSTI)

In the digital VLSI cycle, a netlist is often modified to correct design errors, perform small specification changes or implement incremental rewiring-based optimization operations. Most existing automated logic rectification tools use a small set of ... Keywords: SAT-based algorithm, approximate SPFD, digital VLSI cycle, design errors, incremental rewiring-based optimization operations, automated logic rectification tools, predefined logic transformations, memory/time explosion problem

Yu-Shen Yang; S. Sinha; A. Veneris; R. K. Brayton

2007-01-01T23:59:59.000Z

150

VISCOSITY AND RELAXATION APPROXIMATIONS FOR HYPERBOLIC SYSTEMS OF CONSERVATION LAWS  

E-Print Network [OSTI]

VISCOSITY AND RELAXATION APPROXIMATIONS FOR HYPERBOLIC SYSTEMS deal with the approximation of conservation * *laws via viscosity or relaxation. The following topics are covered: The general structure of viscosity and relaxation approximations is discu

Tzavaras, Athanasios E.

151

Nonlinear adaptive control using radial basis function approximants  

E-Print Network [OSTI]

The purpose of this research is to present an adaptive control strategy using the radial basis function approximation method. Surface approximation methods using radial basis function approximants will first be discussed. The Hamiltonian dynamical...

Petersen, Jerry Lee

1993-01-01T23:59:59.000Z

152

Knapsack Problems with Sigmoid Utilities: Approximation Algorithms via Hybrid Optimization$  

E-Print Network [OSTI]

Knapsack Problems with Sigmoid Utilities: Approximation Algorithms via Hybrid Optimization$ Vaibhav with sigmoid utilities. We merge approximation algorithms from discrete optimization with algorithms from continuous optimization to develop approximation algorithms for these NP-hard problems with sigmoid utilities

Bullo, Francesco

153

Optical panel system including stackable waveguides  

DOE Patents [OSTI]

An optical panel system including stackable waveguides is provided. The optical panel system displays a projected light image and comprises a plurality of planar optical waveguides in a stacked state. The optical panel system further comprises a support system that aligns and supports the waveguides in the stacked state. In one embodiment, the support system comprises at least one rod, wherein each waveguide contains at least one hole, and wherein each rod is positioned through a corresponding hole in each waveguide. In another embodiment, the support system comprises at least two opposing edge structures having the waveguides positioned therebetween, wherein each opposing edge structure contains a mating surface, wherein opposite edges of each waveguide contain mating surfaces which are complementary to the mating surfaces of the opposing edge structures, and wherein each mating surface of the opposing edge structures engages a corresponding complementary mating surface of the opposite edges of each waveguide.

DeSanto, Leonard (Dunkirk, MD); Veligdan, James T. (Manorville, NY)

2007-11-20T23:59:59.000Z

154

Thermovoltaic semiconductor device including a plasma filter  

DOE Patents [OSTI]

A thermovoltaic energy conversion device and related method for converting thermal energy into an electrical potential. An interference filter is provided on a semiconductor thermovoltaic cell to pre-filter black body radiation. The semiconductor thermovoltaic cell includes a P/N junction supported on a substrate which converts incident thermal energy below the semiconductor junction band gap into electrical potential. The semiconductor substrate is doped to provide a plasma filter which reflects back energy having a wavelength which is above the band gap and which is ineffectively filtered by the interference filter, through the P/N junction to the source of radiation thereby avoiding parasitic absorption of the unusable portion of the thermal radiation energy.

Baldasaro, Paul F. (Clifton Park, NY)

1999-01-01T23:59:59.000Z

155

Critical point anomalies include expansion shock waves  

SciTech Connect (OSTI)

From first-principle fluid dynamics, complemented by a rigorous state equation accounting for critical anomalies, we discovered that expansion shock waves may occur in the vicinity of the liquid-vapor critical point in the two-phase region. Due to universality of near-critical thermodynamics, the result is valid for any common pure fluid in which molecular interactions are only short-range, namely, for so-called 3-dimensional Ising-like systems, and under the assumption of thermodynamic equilibrium. In addition to rarefaction shock waves, diverse non-classical effects are admissible, including composite compressive shock-fan-shock waves, due to the change of sign of the fundamental derivative of gasdynamics.

Nannan, N. R., E-mail: ryan.nannan@uvs.edu [Mechanical Engineering Discipline, Anton de Kom University of Suriname, Leysweg 86, PO Box 9212, Paramaribo, Suriname and Process and Energy Department, Delft University of Technology, Leeghwaterstraat 44, 2628 CA Delft (Netherlands); Guardone, A., E-mail: alberto.guardone@polimi.it [Department of Aerospace Science and Technology, Politecnico di Milano, Via La Masa 34, 20156 Milano (Italy); Colonna, P., E-mail: p.colonna@tudelft.nl [Propulsion and Power, Delft University of Technology, Kluyverweg 1, 2629 HS Delft (Netherlands)

2014-02-15T23:59:59.000Z

156

Complex shell model representation including antibound states  

Science Journals Connector (OSTI)

A generalization of the complex shell model formalism is presented that includes antibound states in the basis. These states, together with bound states, Gamow states, and the continuum background, represented by properly chosen scattering waves, form a representation in which all states are treated on the same footing. Two-particle states are evaluated within this formalism, and observable two-particle resonances are defined. The formalism is illustrated in the well-known case of Li11 in its bound ground state and in Ca70(g.s.), which is also bound. Both cases are found to have a halo structure. These halo structures are described within the generalized complex shell model. We investigated the formation of two-particle resonances in these nuclei, but no evidence of such resonances was found.

R. Id Betan; R. J. Liotta; N. Sandulescu; T. Vertse; R. Wyss

2005-11-30T23:59:59.000Z

157

The Monte Carlo Independent Column Approximation’s Conditional Random Noise: Impact on Simulated Climate  

Science Journals Connector (OSTI)

The Monte Carlo Independent Column Approximation (McICA) method for computing domain-average radiative fluxes is unbiased with respect to the full ICA, but its flux estimates contain conditional random noise. Results for five experiments are used ...

P. Räisänen; H. W. Barker; J. N. S. Cole

2005-11-01T23:59:59.000Z

158

Generalized Polya urns via stochastic approximation  

E-Print Network [OSTI]

We collect, survey and develop methods of (one-dimensional) stochastic approximation in a framework that seems suitable to handle fairly broad generalizations of Polya urns. To show the applicability of the results we determine the limiting fraction of balls in an urn with balls of two colors. We consider two models generalizing the Polya urn, in the first one ball is drawn and replaced with balls of (possibly) both colors according to which color was drawn. In the second, two balls are drawn simultaneously and replaced along with balls of (possibly) both colors according to what combination of colors were drawn.

Renlund, Henrik

2010-01-01T23:59:59.000Z

159

SEEPAGE MODEL FOR PA INCLUDING DRIFT COLLAPSE  

SciTech Connect (OSTI)

The purpose of this report is to document the predictions and analyses performed using the seepage model for performance assessment (SMPA) for both the Topopah Spring middle nonlithophysal (Tptpmn) and lower lithophysal (Tptpll) lithostratigraphic units at Yucca Mountain, Nevada. Look-up tables of seepage flow rates into a drift (and their uncertainty) are generated by performing numerical simulations with the seepage model for many combinations of the three most important seepage-relevant parameters: the fracture permeability, the capillary-strength parameter 1/a, and the percolation flux. The percolation flux values chosen take into account flow focusing effects, which are evaluated based on a flow-focusing model. Moreover, multiple realizations of the underlying stochastic permeability field are conducted. Selected sensitivity studies are performed, including the effects of an alternative drift geometry representing a partially collapsed drift from an independent drift-degradation analysis (BSC 2004 [DIRS 166107]). The intended purpose of the seepage model is to provide results of drift-scale seepage rates under a series of parameters and scenarios in support of the Total System Performance Assessment for License Application (TSPA-LA). The SMPA is intended for the evaluation of drift-scale seepage rates under the full range of parameter values for three parameters found to be key (fracture permeability, the van Genuchten 1/a parameter, and percolation flux) and drift degradation shape scenarios in support of the TSPA-LA during the period of compliance for postclosure performance [Technical Work Plan for: Performance Assessment Unsaturated Zone (BSC 2002 [DIRS 160819], Section I-4-2-1)]. The flow-focusing model in the Topopah Spring welded (TSw) unit is intended to provide an estimate of flow focusing factors (FFFs) that (1) bridge the gap between the mountain-scale and drift-scale models, and (2) account for variability in local percolation flux due to stochastic hydrologic properties and flow processes.

C. Tsang

2004-09-22T23:59:59.000Z

160

The Casimir Energy for a Hyperboloid Facing a Plate in the Optical Approximation  

E-Print Network [OSTI]

We study the Casimir energy of a massless scalar field that obeys Dirichlet boundary conditions on a hyperboloid facing a plate. We use the optical approximation including the first six reflections and compare the results with the predictions of the proximity force approximation and the semi-classical method. We also consider finite size effects by contrasting the infinite with a finite plate. We find sizable and qualitative differences between the new optical method and the more traditional approaches.

O. Schroeder; A. Scardicchio; R. L. Jaffe

2005-07-21T23:59:59.000Z

Note: This page contains sample records for the topic "arabia include approximately" 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

Approximation method for spin-½ Ising models  

Science Journals Connector (OSTI)

An approximation for calculating the thermodynamic properties of spin-½ Ising models is described. The method is based on the formulation of Kramers and Wannier for the square lattice, and involves expressing the free energy in terms of the limiting maximum eigenvalue of a matrix sequence which represents the contribution from a single spin of the lattice. The application of this formulation to various two- and three-dimensional lattices shows that many of these are characterized by an identically structured matrix sequence with exactly two nonvanishing elements in each row and column. To explore the potential of using this similarity and its simplicity for analyzing Ising models we consider the two-dimensional square lattice in an external field and approximate the doubly infinite lattice by a semi-infinite one consisting of n (?10) infinitely long rows. Calculations are carried out and compared with (1) Onsager's formula for the free energy, (2) the Onsanger-Yang formula for the spontaneous magnetization, and (3) values calculated from series. Except for the region around the critical point where the correlation length exceeds n lattice spacings, substantial agreement—to better than 12 places of decimals in some cases—is obtained. As an additional measure of the potential of this method, a value for the critical exponent ? is computed by the extrapolation of the magnetization along the critical isotherm. The result is found to be in excellent agreement with the known value for ?.

Solomon Gartenhaus

1983-02-01T23:59:59.000Z

162

An Improved Approximation Algorithm For Vertex Cover with Hard Capacities  

E-Print Network [OSTI]

An Improved Approximation Algorithm For Vertex Cover with Hard Capacities #3; Rajiv Gandhi y Eran-hard as it generalizes the well-known vertex cover problem. Previously, approximation algorithms with an approximation version of this problem is at least as hard as set cover; in addition, they developed a 3-approximation

Srinivasan, Aravind

163

On the mathematical treatment of the Born-Oppenheimer approximation.  

E-Print Network [OSTI]

On the mathematical treatment of the Born-Oppenheimer approximation. Thierry Jecko AGM, UMR 8088 du the main ideas used by mathematicians to show the accuracy of the Born-Oppenheimer approximation of the approximation in Chemistry. We contribute in this way to the discussion on the Born-Oppenheimer approximation

Paris-Sud XI, Université de

164

A comparison of approximate models for radiation in gas turbines  

Science Journals Connector (OSTI)

Approximate equations for radiative heat transfer equations coupled to an equation for the temperature are stated and a comparative numerical study of the different approximations is given. The approximation methods considered here range from moment methods to simplified PN-approximations. Numerical experiments and comparisons in different space dimensions and for various physical situations are presented.

M. Frank; M. Seaid; A. Klar; R. Pinnau; G. Thommes; J. Janicka

2004-01-01T23:59:59.000Z

165

Incorporation of particle collisions in the time-dependent Hartree-Fock approximation  

SciTech Connect (OSTI)

In the time-dependent Hartree-Fock (TDHF) approximation, particles interact only through the mean field, and the collisions between particles are not included. Previously, we formulated the extended time-dependent Hartree-Fock (ETDHF) approximation to include particle collisions in terms of a temporal variation of the occupation probability n/sub lambda/ for the single-particle states. In the simplest approximation, the single-particle potential is modified only through the particle density which depends on n/sub lambda/. We wish to refine the extended TDHF approximation by studying how particle collisions affect the single-particle potential. We find that it acquires two second-order contributions which are state-dependent and are the generalization of the core polarization and correlation contributions one encounters in the study of the nucleon-nucleus optical potentials. In consequence, concepts such as energy-dependent single-particle potentials and effective masses may be properly introduced in the extended TDHF approximation. We also wish to review the conservation of energy in the ETDHF approximation. We find that the total energy should include a second-order contribution due to correlations arising from particle collisions.

Wong, C.Y.

1982-01-01T23:59:59.000Z

166

The Approximability Behaviour of Some Combinatorial Problems with Respectto the Approximability of a Class of Maximum Independent Set Problems  

Science Journals Connector (OSTI)

We prove that the existence of a polynomial time ?-approximation algorithm (where ? < 1 is a fixed constant) for a class of independent set problems, leads to a polynomial time approximation algorithm with approximation ratio strictly ... Keywords: NP-complete problem, convex programming, independent set, polynomial time approximation algorithm, quadratic programming, vertex covering

Marc Demange; Vangelis Th. Paschos

1997-05-01T23:59:59.000Z

167

Semiclassical approximation to supersymmetric quantum gravity  

SciTech Connect (OSTI)

We develop a semiclassical approximation scheme for the constraint equations of supersymmetric canonical quantum gravity. This is achieved by a Born-Oppenheimer type of expansion, in analogy to the case of the usual Wheeler-DeWitt equation. The formalism is only consistent if the states at each order depend on the gravitino field. We recover at consecutive orders the Hamilton-Jacobi equation, the functional Schroedinger equation, and quantum gravitational correction terms to this Schroedinger equation. In particular, the following consequences are found: (i) the Hamilton-Jacobi equation and therefore the background spacetime must involve the gravitino, (ii) a (many-fingered) local time parameter has to be present on super Riem {sigma} (the space of all possible tetrad and gravitino fields) (iii) quantum supersymmetric gravitational corrections affect the evolution of the very early Universe. The physical meaning of these equations and results, in particular, the similarities to and differences from the pure bosonic case, are discussed.

Kiefer, Claus; Lueck, Tobias; Moniz, Paulo [Institut fuer Theoretische Physik, Universitaet zu Koeln, Zuelpicher Strasse 77, 50937 Cologne (Germany); Astronomy Unit, School of Mathematical Sciences, Queen Mary College, University of London, Mile End Road, London E1 4NS (United Kingdom)

2005-08-15T23:59:59.000Z

168

Adiabatic Approximation, Semiclassical Scattering, and Unidirectional Invisibility  

E-Print Network [OSTI]

The transfer matrix of a possibly complex and energy-dependent scattering potential can be identified with the $S$-matrix of a two-level time-dependent non-Hermitian Hamiltonian H(t). We show that the application of the adiabatic approximation to H(t) corresponds to the semiclassical description of the original scattering problem. In particular, the geometric part of the phase of the evolving eigenvectors of H(t) gives the pre-exponential factor of the WKB wave functions. We use these observations to give an explicit semiclassical expression for the transfer matrix. This allows for a detailed study of the semiclassical unidirectional reflectionlessness and invisibility. We examine concrete realizations of the latter in the realm of optics.

Ali Mostafazadeh

2014-01-17T23:59:59.000Z

169

Heat flow in the postquasistatic approximation  

SciTech Connect (OSTI)

We apply the postquasistatic approximation to study the evolution of spherically symmetric fluid distributions undergoing dissipation in the form of radial heat flow. For a model that corresponds to an incompressible fluid departing from the static equilibrium, it is not possible to go far from the initial state after the emission of a small amount of energy. Initially collapsing distributions of matter are not permitted. Emission of energy can be considered as a mechanism to avoid the collapse. If the distribution collapses initially and emits one hundredth of the initial mass only the outermost layers evolve. For a model that corresponds to a highly compressed Fermi gas, only the outermost shell can evolve with a shorter hydrodynamic time scale.

Rodriguez-Mueller, B. [Computational Science Research Center, College of Sciences, San Diego State University, San Diego, California (United States); Peralta, C. [Deutscher Wetterdienst, Frankfurter Strasse 135, 63067 Offenbach (Germany); School of Physics, University of Melbourne, Parkville, VIC 3010 (Australia); Barreto, W. [Centro de Fisica Fundamental, Facultad de Ciencias, Universidad de Los Andes, Merida (Venezuela, Bolivarian Republic of); Rosales, L. [Laboratorio de Fisica Computacional, Universidad Experimental Politecnica, 'Antonio Jose de Sucre', Puerto Ordaz (Venezuela, Bolivarian Republic of)

2010-08-15T23:59:59.000Z

170

Heat flow in the postquasistatic approximation  

E-Print Network [OSTI]

We apply the postquasistatic approximation to study the evolution of spherically symmetric fluid distributions undergoing dissipation in the form of radial heat flow. For a model which corresponds to an incompressible fluid departing from the static equilibrium, it is not possible to go far from the initial state after the emission of a small amount of energy. Initially collapsing distributions of matter are not permitted. Emission of energy can be considered as a mechanism to avoid the collapse. If the distribution collapses initially and emits one hundredth of the initial mass only the outermost layers evolve. For a model which corresponds to a highly compressed Fermi gas, only the outermost shell can evolve with a shorter hydrodynamic time scale.

B. Rodríguez-Mueller; C. Peralta; W. Barreto; L. Rosales

2010-05-10T23:59:59.000Z

171

Approximation of the Quadratic Knapsack Problem  

E-Print Network [OSTI]

classes that include the complete graph or contain large cliques. These ...... greater or equal to pJ and weight at most cJ the following structure holds for.

2013-12-04T23:59:59.000Z

172

Modification of the Bessel?Fubini Solution That Includes Attenuation  

Science Journals Connector (OSTI)

Burgers' equation is a nonlinear acoustical wave equation which approximately governs the propagation of finite?amplitude waves with dissipation and spreading losses. A new solution is derived for a spherically diverging sinusoidal waveform. By means of this solution the amplitudes of the harmonic levels above the third can be more readily estimated than by successive approximation.

Boyd Cary

1971-01-01T23:59:59.000Z

173

Global dynamics and inflationary center manifold and slow-roll approximants  

E-Print Network [OSTI]

We consider the familiar problem of a minimally coupled scalar field with quadratic potential in flat Friedmann-Lema\\^itre-Robertson-Walker cosmology to illustrate a number of techniques and tools, which can be applied to a wide range of scalar field potentials and problems in e.g. modified gravity. We present a global dynamical systems description that yields a global understanding of the solution space, including asymptotic features. We introduce dynamical systems techniques such as center manifold expansions and use Pad\\'e approximants to obtain improved approximations for the `attractor solution' at early times. We also show that future asymptotic behavior is associated with a limit cycle, which shows that self-similarity is asymptotically broken toward the future, and give approximative expressions for this behavior. We then combine these results to obtain global approximations for the attractor solution, which, e.g., might be used in the context of global measures. In addition we elucidate the connection between slow-roll based approximations and the attractor solution, and compare these approximations with the center manifold based approximants.

Artur Alho; Claes Uggla

2014-06-02T23:59:59.000Z

174

Femtolensing: Beyond the Semi-Classical Approximation  

E-Print Network [OSTI]

Femtolensing is a gravitational lensing effect in which the magnification is a function not only of the positions and sizes of the source and lens, but also of the wavelength of light. Femtolensing is the only known effect of $(10^{-13}-10^{-16} M_{\\sun})$ dark-matter objects and may possibly be detectable in cosmological gamma-ray burst spectra. We present a new and efficient algorithm for femtolensing calculations in general potentials. The physical-optics results presented here differ at low frequencies from the semi-classical approximation, in which the flux is attributed to a finite number of mutually coherent images. At higher frequencies, our results agree well with the semi-classical predictions. Applying our method to a point-mass lens with external shear, we find complex events that have structure at both large and small spectral resolution. In this way, we show that femtolensing may be observable for lenses up to $10^{-11}$ solar masses, much larger than previously believed. Additionally, we discuss the possibility of a search for femtolensing of white dwarfs in the LMC at optical wavelengths.

A. Ulmer; J. Goodman

1994-06-13T23:59:59.000Z

175

VISCOSITY AND RELAXATION APPROXIMATIONS FOR HYPERBOLIC SYSTEMS OF CONSERVATION LAWS  

E-Print Network [OSTI]

VISCOSITY AND RELAXATION APPROXIMATIONS FOR HYPERBOLIC SYSTEMS OF CONSERVATION LAWS Athanasios E. Tzavaras Abstract. These lecture notes deal with the approximation of conservation laws via viscosity or relaxation. The following topics are covered: The general structure of viscosity and relaxation

Tzavaras, Athanasios E.

176

Approximate Linear Programming for Firstorder MDPs Scott Sanner  

E-Print Network [OSTI]

, the bounds that we derive for approximation error apply equally to all domain instantiations (i.eApproximate Linear Programming for First­order MDPs Scott Sanner University of Toronto Department

Sanner, Scott

177

Three fast computational approximation methods in hypersonic aerothermodynamics  

E-Print Network [OSTI]

Three fast computational approximation methods in hypersonic aerothermodynamics V.V. Riabov* Rivier analyzed to study nonequilibrium hypersonic viscous flows near blunt bodies. These approximations allow; Nonequilibrium hypersonic flows 1. Introduction Numerous methods [1,2] that require significant computational

Riabov, Vladimir V.

178

The Hadley Circulation and the Weak Temperature Gradient Approximation  

Science Journals Connector (OSTI)

The weak temperature gradient (WTG) approximation is applied to simple shallow-water models of the Hadley circulation. While it is difficult to formally justify the use of the WTG approximation for this problem, the derived WTG solutions are ...

L. M. Polvani; A. H. Sobel

2002-05-01T23:59:59.000Z

179

An approximate thermal analysis of Stirling engine regenerators  

Science Journals Connector (OSTI)

This paper approximates the transport phenomena in a Stirling engine regenerator to aid its practical design. The...

S. H. Park; Y. -S. Lee

1993-06-01T23:59:59.000Z

180

Bond selective chemistry beyond the adiabatic approximation  

SciTech Connect (OSTI)

One of the most important challenges in chemistry is to develop predictive ability for the branching between energetically allowed chemical reaction pathways. Such predictive capability, coupled with a fundamental understanding of the important molecular interactions, is essential to the development and utilization of new fuels and the design of efficient combustion processes. Existing transition state and exact quantum theories successfully predict the branching between available product channels for systems in which each reaction coordinate can be adequately described by different paths along a single adiabatic potential energy surface. In particular, unimolecular dissociation following thermal, infrared multiphoton, or overtone excitation in the ground state yields a branching between energetically allowed product channels which can be successfully predicted by the application of statistical theories, i.e. the weakest bond breaks. (The predictions are particularly good for competing reactions in which when there is no saddle point along the reaction coordinates, as in simple bond fission reactions.) The predicted lack of bond selectivity results from the assumption of rapid internal vibrational energy redistribution and the implicit use of a single adiabatic Born-Oppenheimer potential energy surface for the reaction. However, the adiabatic approximation is not valid for the reaction of a wide variety of energetic materials and organic fuels; coupling between the electronic states of the reacting species play a a key role in determining the selectivity of the chemical reactions induced. The work described below investigated the central role played by coupling between electronic states in polyatomic molecules in determining the selective branching between energetically allowed fragmentation pathways in two key systems.

Butler, L.J. [Univ. of Chicago, IL (United States)

1993-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "arabia include approximately" 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

Improved Approximation Algorithms for the Partial Vertex Cover Problem  

E-Print Network [OSTI]

Improved Approximation Algorithms for the Partial Vertex Cover Problem Eran Halperin 1? and Aravind words and phrases. Partial vertex cover, approximation algorithms, semide#12;nite programming edges are covered. Just as for the vertex cover problem, 2-approximation algorithms are known

Srinivasan, Aravind

182

An Improved Approximation Algorithm For Vertex Cover with Hard Capacities  

E-Print Network [OSTI]

of this problem is at least as hard as set cover; they have also developed a 3-approximation algorithm cover problem. Key Words and Phrases: Approximation algorithms, capacitated covering, set cover, vertexAn Improved Approximation Algorithm For Vertex Cover with Hard Capacities (Extended Abstract) Rajiv

Khuller, Samir

183

A Local 2-approximation Algorithm for the Vertex Cover Problem  

E-Print Network [OSTI]

A Local 2-approximation Algorithm for the Vertex Cover Problem Matti °Astrand, Patrik Flor.lastname}@cs.helsinki.fi Abstract. We present a distributed 2-approximation algorithm for the minimum vertex cover problem and Johnson's [2] list. In a centralised setting, the polynomial-time approximability of the vertex cover

Suomela, Jukka

184

A Parallel Algorithm for Approximating the Minimum Cycle Cover  

E-Print Network [OSTI]

approximation algorithm for the problem of finding a minimum cycle cover. A cycle cover is a set of cycles cover [1, 7, 8]. The basis for our approximation algorithm is a routine to find a maximal set of edgeA Parallel Algorithm for Approximating the Minimum Cycle Cover Philip Klein \\Lambda Aiken

Yang, Junfeng

185

An Improved Approximation Algorithm For Vertex Cover with Hard Capacities  

E-Print Network [OSTI]

as hard as set cover; they have also developed a 3-approximation algorithm for the unweighted version. We Words and Phrases: Approximation algorithms, capacitated covering, set cover, vertex cover, linearAn Improved Approximation Algorithm For Vertex Cover with Hard Capacities (Extended Abstract) Rajiv

Srinivasan, Aravind

186

Viscosity and Relaxation Approximation for Hyperbolic Systems of Conservation Laws  

E-Print Network [OSTI]

Viscosity and Relaxation Approximation for Hyperbolic Systems of Conservation Laws Athanasios E with the approximation of conservation laws via viscosity or relaxation. The following topics are covered: The general structure of viscosity and relaxation approximations is discussed, as suggested by the second law

Tzavaras, Athanasios E.

187

SUBTRACTING A BEST RANK-1 APPROXIMATION MAY INCREASE TENSOR RANK  

E-Print Network [OSTI]

SUBTRACTING A BEST RANK-1 APPROXIMATION MAY INCREASE TENSOR RANK Alwin Stegeman Heymans Institute, fax: +33 4 92 94 28 98, pcomon@unice.fr ABSTRACT Is has been shown that a best rank-R approximation be solved by consecutively computing and substracting best rank-1 approximations. The reason

Paris-Sud XI, Université de

188

On the mathematical treatment of the Born-Oppenheimer approximation.  

E-Print Network [OSTI]

On the mathematical treatment of the Born-Oppenheimer approximation. Thierry Jecko AGM, UMR 8088 du the main ideas used by mathematicians to show the accuracy of the Born-Oppenheimer approximation in this way to the discussion on the Born-Oppenheimer approximation initiated in [SW]. The paper neither

189

On the mathematical treatment of the Born-Oppenheimer approximation.  

E-Print Network [OSTI]

On the mathematical treatment of the Born-Oppenheimer approximation. Thierry Jecko AGM, UMR 8088 du the main ideas used by mathematicians to show the accuracy of the Born-Oppenheimer approximation in this way to the discussion on the Born-Oppenheimer approximation initiated in [SW1]. The paper neither

Paris-Sud XI, Université de

190

Smoluchowski-Kramers approximation in the case of variable friction  

E-Print Network [OSTI]

We consider the small mass asymptotics (Smoluchowski-Kramers approximation) for the Langevin equation with a variable friction coefficient. The limit of the solution in the classical sense does not exist in this case. We study a modification of the Smoluchowski-Kramers approximation. Some applications of the Smoluchowski-Kramers approximation to problems with fast oscillating or discontinuous coefficients are considered.

Mark Freidlin; Wenqing Hu

2012-03-03T23:59:59.000Z

191

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

192

Approximation of conic sections by curvature continuous quartic Bézier curves  

Science Journals Connector (OSTI)

In this paper we propose two approximation methods of conic section by quartic Bezier curves. These are the extensions of the quartic Bezier approximations of circular arcs presented in Ahn and Kim (1997) [1] and Kim and Ahn (2007) [10] to conic cases. ... Keywords: Approximation order, Conic section, Curvature continuity, Hausdorff distance, Quartic Bézier curves, Spline

Young Joon Ahn

2010-10-01T23:59:59.000Z

193

The effects of various approximations on electron-electron scattering calculations in QCLs  

E-Print Network [OSTI]

The effects of various approximations on electron-electron scattering calculations in QCLs Philip which are sometimes ignored in calculating electron-electron scattering rates. These effects include depends on the effects of electron transport. Electron-electron scattering is an essential mechanism

Massachusetts at Lowell, University of

194

Embedding of the Brueckner Approximation in the Extended Jastrow Scheme  

Science Journals Connector (OSTI)

A nonperturbative derivation of the Brueckner approximation to the ground-state energy of nuclear matter (with standard choice of hole and particle energies) is given within the framework of the method of correlated basis functions. The structure of the factor-cluster (FIY) expansion of the expectation value of the Hamiltonian with respect to a trial function incorporating short-range correlations in a general fashion, is analyzed for a uniform extended medium of fermions. With a special choice of correlated wave function, the Brueckner approximation is extracted from the FIY expansion by selective summation of two-body combination terms to all orders in the smallness parameter ? associated, in this case, with both Brueckner-Bethe-Goldstone and FIY energy expansions. A reexamination of the numerical comparison of conventional Brueckner and Jastrow methods carried out earlier for two simple models of nuclear matter leads to the conclusion that it is inadvisable, at least in a Jastrow calculation satisfying the average Pauli condition, to incorporate the O(?) contribution of the analog of the dispersion correction of reaction-matrix theory without at the same time including the O(?) contribution of the analog of the Bethe-Faddeev term. For the uniform extended medium for the Jastrow choice of wave function, there is a formal cancellation of these two three-body contributions, the scale of this cancellation being governed by the size of ?. In the numerical example considered, ? is about 0.22 and the cancellation goes something like +14 MeV-15 MeV=-1 MeV. These findings, when juxtaposed with the standard Brueckner results for the simple models in question, suggest that a departure from the standard prescription of hole and particle energies in reaction-matrix theory may be necessary when ? is sizeable-as in liquid He3 and the high-density neutron gas, as well as equilibrium nuclear matter described with some potentials.

J. W. Clark and M. L. Ristig

1973-05-01T23:59:59.000Z

195

Energetics of a fluid under the Boussinesq approximation  

E-Print Network [OSTI]

This paper presents a theory describing the energy budget of a fluid under the Boussinesq approximation: the theory is developed in a manner consistent with the conservation law of mass. It shows that no potential energy is available under the Boussinesq approximation, and also reveals that the work done by the buoyancy force due to changes in temperature corresponds to the conversion between kinetic and internal energy. This energy conversion, however, makes only an ignorable contribution to the distribution of temperature under the approximation. The Boussinesq approximation is, in physical oceanography, extended so that the motion of seawater can be studied. This paper considers this extended approximation as well. Under the extended approximation, the work done by the buoyancy force due to changes in salinity corresponds to the conversion between kinetic and potential energy. It also turns out that the conservation law of mass does not allow the condition $\

Maruyama, Kiyoshi

2014-01-01T23:59:59.000Z

196

Optimization Online - Fast Approximations for Online Scheduling of ...  

E-Print Network [OSTI]

Jun 19, 2014 ... Fast Approximations for Online Scheduling of Outpatient Procedure Centers. Berg(bberg2 ***at*** gmu.edu) Denton(btdenton ***at*** ...

Berg

2014-06-19T23:59:59.000Z

197

On Low Rank Matrix Approximations with Applications to Synthesis ...  

E-Print Network [OSTI]

a given matrix by a matrix of specified (low rank) in the uniform norm. ... Note that in the existing literature on low rank approximation of matrices the empha-.

2011-05-23T23:59:59.000Z

198

L^p Bernstein Inequalities and Radial Basis Function Approximation  

E-Print Network [OSTI]

on scattered data This dissertation follows the style of the Journal of Approximation Theory. 2 sites. F.J. Narcowich and J.D. Ward have made signi cant contributions to this eld studying approximation on compact manifolds where the data sites are allowed... on scattered data This dissertation follows the style of the Journal of Approximation Theory. 2 sites. F.J. Narcowich and J.D. Ward have made signi cant contributions to this eld studying approximation on compact manifolds where the data sites are allowed...

Ward, John P.

2012-10-19T23:59:59.000Z

199

Bethe free-energy approximations for disordered quantum systems  

E-Print Network [OSTI]

Given a locally consistent set of reduced density matrices, we construct approximate density matrices which are globally consistent with the local density matrices we started from when the trial density matrix has a tree structure. We employ the cavity method of statistical physics to find the optimal density matrix representation by slowly decreasing the temperature in an annealing algorithm, or by minimizing an approximate Bethe free energy depending on the reduced density matrices and some cavity messages originated from the Bethe approximation of the entropy. We obtain the classical Bethe expression for the entropy within a naive (mean-field) approximation of the cavity messages, which is expected to work well at high temperatures. In the next order of the approximation, we obtain another expression for the Bethe entropy depending only on the diagonal elements of the reduced density matrices. In principle, we can improve the entropy approximation by considering more accurate cavity messages in the Bethe approximation of the entropy. We compare the annealing algorithm and the naive approximation of the Bethe entropy with exact and approximate numerical simulations for small and large samples of the random transverse Ising model on random regular graphs.

I. Biazzo; A. Ramezanpour

2014-07-08T23:59:59.000Z

200

E-Print Network 3.0 - approximation descriptions microscopiques...  

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

de l'approximation locale. Ce calcul est entirement... :lpmmc.grenoble.cnrs.frspip.php?article404 Description : Les polaritons de cavit sont des quasiparticules hybrides...

Note: This page contains sample records for the topic "arabia include approximately" 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

Finding approximately rank-one submatrices with the nuclear norm ...  

E-Print Network [OSTI]

Nov 8, 2010 ... Abstract: We propose a convex optimization formulation with the nuclear norm and $\\ell_1$-norm to find a large approximately rank-one ...

Xuan Vinh Doan

2010-11-08T23:59:59.000Z

202

Better approximation guarantees for job-shop scheduling  

SciTech Connect (OSTI)

Job-shop scheduling is a classical NP-hard problem. Shmoys, Stein & Wein presented the first polynomial-time approximation algorithm for this problem that has a good (polylogarithmic) approximation guarantee. We improve the approximation guarantee of their work, and present further improvements for some important NP-hard special cases of this problem (e.g., in the preemptive case where machines can suspend work on operations and later resume). We also present NC algorithms with improved approximation guarantees for some NP-hard special cases.

Goldberg, L.A.; Paterson, M. [Univ. of Warwick, Conventry (United Kingdom); Srinivasan, A. [National Univ. of Singapore (Singapore)] [and others

1997-06-01T23:59:59.000Z

203

Nuclear Arms Control R&D Consortium includes Los Alamos  

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

Nuclear Arms Control R&D Consortium includes Los Alamos Nuclear Arms Control R&D Consortium includes Los Alamos A consortium led by the University of Michigan that includes LANL as...

204

Generalized approximations of reflection coefficients in orthorhombic media  

Science Journals Connector (OSTI)

Reflection coefficients of qP- (quasi-P) and qS- (quasi-S) incident waves in orthorhombic media can be explicitly expressed by means of impedance matrices. In this paper, we extend previous studies and derive the generalized and linearized equations of reflectivity for all four types of waves in the symmetry-axis plane. These approximations have sufficient accuracy over a wide range of angles, therefore they are suitable for characterizing the seismic amplitude responses of unconventional resources. For example, they can be applied to represent the amplitude variation with offset for shale gas or coalbed methane reservoirs with strong anisotropy and complicated symmetry. Reduced equations are then derived in a transverse isotropic medium with a vertical symmetry axis (VTI) or a horizontal axis (HTI) for the anisotropic amplitude inversion. They retain higher accuracy than the corresponding previously published expressions at a strongly anisotropic interface, because they include the second-order terms of anisotropic parameters contrast. Numerical analyses on the inverse problem using different linearized expressions show the practical value of the new derived expressions in the joint inversion of the qPqP- and qPqS-waves for elastic parameters and anisotropic parameters.

Feng Zhang; Xiangyang Li

2013-01-01T23:59:59.000Z

205

Simulating higher-dimensional geometries in GADRAS using approximate one-dimensional solutions.  

SciTech Connect (OSTI)

The Gamma Detector Response and Analysis Software (GADRAS) software package is capable of simulating the radiation transport physics for one-dimensional models. Spherical shells are naturally one-dimensional, and have been the focus of development and benchmarking. However, some objects are not spherical in shape, such as cylinders and boxes. These are not one-dimensional. Simulating the radiation transport in two or three dimensions is unattractive because of the extra computation time required. To maintain computational efficiency, higher-dimensional geometries require approximations to simulate them in one-dimension. This report summarizes the theory behind these approximations, tests the theory against other simulations, and compares the results to experimental data. Based on the results, it is recommended that GADRAS users always attempt to approximate reality using spherical shells. However, if fissile material is present, it is imperative that the shape of the one-dimensional model matches the fissile material, including the use of slab and cylinder geometry.

Thoreson, Gregory G.; Mitchell, Dean James; Harding, Lee T.

2013-02-01T23:59:59.000Z

206

Polynomialtime approximation algorithms for the Ising model \\Lambda  

E-Print Network [OSTI]

Polynomial­time approximation algorithms for the Ising model \\Lambda Mark Jerrum and Alistair, Scotland November 1989 (revised December 1991) Abbreviated title: Approximation algorithms for the Ising evaluates the partition function of an arbitrary ferromagnetic Ising system to any specified degree

Sinclair, Alistair

207

On the Oberbeck-Boussinesq approximation on unbounded domains  

E-Print Network [OSTI]

On the Oberbeck-Boussinesq approximation on unbounded domains Eduard Feireisl and Maria E. Schonbek Abstract We study the Oberbeck-Boussinesq approximation describing the mo- tion of an incompressible, heat that the total energy of any solution of the resulting Oberbeck-Boussinesq system tends to zero with growing time

Schonbek, Maria

208

Generalizing the Boussinesq Approximation to Stratified Compressible Flow  

E-Print Network [OSTI]

Generalizing the Boussinesq Approximation to Stratified Compressible Flow Dale R. Durran a Akio The simplifications required to apply the Boussinesq approximation to compressible flow are compared with those compressible fluid with the Boussinesq continuity equation has led to the development of several different sets

209

Dynamic Enthalpy, Conservative Temperature, and the Seawater Boussinesq Approximation  

E-Print Network [OSTI]

Dynamic Enthalpy, Conservative Temperature, and the Seawater Boussinesq Approximation WILLIAM R (Manuscript received 8 June 2009, in final form 27 August 2009) ABSTRACT A new seawater Boussinesq system of the full system. The seawater Boussinesq approximation simplifies the mass con- servation equation to $ Á u

Young, William R.

210

Lecture 20: Approximate algorithms Outline of this Lecture  

E-Print Network [OSTI]

for approximation algorithms. ffl Vertex­cover problem. ffl Traveling­salesman problem. 1 #12; Introduction Many. Another example is we are looking for a maximum size independent set (IS). An approximate algorithm; Vertex­cover Vertex Cover: A vertex cover of a graph G is a set of vertices such that every edge in G

Wu, Dekai

211

Lecture 20: Approximate algorithms Outline of this Lecture  

E-Print Network [OSTI]

for approximation algorithms. Vertex-cover problem. Traveling-salesman problem. 1 #12;Introduction Many. Another example is we are looking for a maximum size independent set (IS). An approximate algorithm Cover: A vertex cover of a graph is a set of vertices such that every edge in is incident

Wu, Dekai

212

10 -Approximation Algorithm for a Generalization of the Weighted  

E-Print Network [OSTI]

A 2 1 10 -Approximation Algorithm for a Generalization of the Weighted Edge-Dominating Set Problem consider a natural strategy, reducing edge-dominating set to edge cover. Our main result is a simple 2 1 10 -approximation algorithm for the weighted edge-dominating set problem, improving the existing ratio, due

Parekh, Ojas

213

Parametric Optimization of Artificial Neural Networks for Signal Approximation Applications  

E-Print Network [OSTI]

Parametric Optimization of Artificial Neural Networks for Signal Approximation Applications J. Lane.thames@gatech.edu randal.abler@gatech.edu dirk.schaefer@me.gatech.edu ABSTRACT Artificial neural networks are used to solve set of configuration parameters for artificial neural networks such that the network's approximation

214

Fast Vectorless Power Grid Verification Using an Approximate Inverse Technique  

E-Print Network [OSTI]

Fast Vectorless Power Grid Verification Using an Approximate Inverse Technique Nahi H. Abdul Ghani Department of ECE University of Toronto Toronto, Ontario, Canada f.najm@utoronto.ca ABSTRACT Power grid Aids General Terms Performance, Algorithms, Verification Keywords Power grid, voltage drop, approximate

Najm, Farid N.

215

Neural Network-Based Accelerators for Transcendental Function Approximation  

E-Print Network [OSTI]

Neural Network-Based Accelerators for Transcendental Function Approximation Schuyler Eldridge accelerators has the potential to sustain the his- toric energy and performance improvements of computing systems. We propose the use of NN-based accelerators to approximate mathematical functions in the GNU C

Joshi, Ajay

216

Born-Oppenheimer approximation for a harmonic molecule  

E-Print Network [OSTI]

We apply the Born-Oppenheimer approximation to a harmonic diatomic molecule with one electron. We compare the exact and approximate results not only for the internal degrees of freedom but also for the motion of the center of mass. We address the problem of identical nuclei and discuss other applications of the model and its limitations.

Francisco M. Fernandez

2008-10-13T23:59:59.000Z

217

The Born-Oppenheimer Approximation C. David Sherrill  

E-Print Network [OSTI]

The Born-Oppenheimer Approximation C. David Sherrill School of Chemistry and Biochemistry Georgia as a product of nuclear and elec- tronic terms, (r, R) = (r)(R). We thus introduce the Born-Oppenheimer that the total wavefunction is given as (r; R)(R). The Born-Oppenheimer approximation rests on the fact

Sherrill, David

218

Parallel algorithms for approximation of distance maps on parametric surfaces  

E-Print Network [OSTI]

results demonstrate up to four orders of magnitude improvement in execution time compared to the state(n) numerical algorithm for first-order approximation of geodesic distances on geometry images, where n charts, parallel algorithms, GPU, SIMD 1. INTRODUCTION Approximation of geodesic distances on curved

Kimmel, Ron

219

APPROXIMATE HAMILTON DECOMPOSITIONS OF ROBUSTLY EXPANDING REGULAR DIGRAPHS  

E-Print Network [OSTI]

APPROXIMATE HAMILTON DECOMPOSITIONS OF ROBUSTLY EXPANDING REGULAR DIGRAPHS DERYK OSTHUS and is a robust outexpander has an approximate decomposition into edge-disjoint Hamilton cycles, i.e. G contains a set of r -o(r) edge-disjoint Hamilton cycles. Here G is a robust outexpander if for every set S which

Osthus, Deryk

220

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

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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

Absolute Approximation of Tukey Depth: Theory and Experiments  

E-Print Network [OSTI]

Absolute Approximation of Tukey Depth: Theory and Experiments Dan Chen School of Computer Science¨ur Theoretische Informatik Abstract A Monte Carlo approximation algorithm for the Tukey depth problem in high. Keywords: Tukey depth, computational geometry 1. Introduction Tukey depth is also known as location depth

Morin, Pat

223

HEREDITARY APPROXIMATION PROPERTY W. B. JOHNSON AND A. SZANKOWSKI  

E-Print Network [OSTI]

HEREDITARY APPROXIMATION PROPERTY W. B. JOHNSON AND A. SZANKOWSKI Abstract. If X is a Banach space approximation property, trace formula. Johnson was supported in part by NSF DMS-0500292, DMS-1001321, and the U.S.-Israel Binational Science Foundation. 1 #12;2 W. B. JOHNSON AND A. SZANKOWSKI (S) Is there a HAPpy space that has

Johnson, William B.

224

Energy Content of Colliding Plane Waves using Approximate Noether Symmetries  

E-Print Network [OSTI]

This paper is devoted to study the energy content of colliding plane waves using approximate Noether symmetries. For this purpose, we use approximate Lie symmetry method of Lagrangian for differential equations. We formulate the first-order perturbed Lagrangian for colliding plane electromagnetic and gravitational waves. It is shown that in both cases, there does not exist

M. Sharif; Saira Waheed

2011-09-19T23:59:59.000Z

225

Approximate Dynamic Programming for High Dimensional Resource Allocation Problems  

E-Print Network [OSTI]

the dimensionality of these variables is in the ten thousand to one million range. We describe an approximation in Section II by presenting a simple but general model for the management of discrete resources. Section III describes an algorithmic strategy using the principles of approximate dynamic programming. Section IV

Powell, Warren B.

226

Approximating Probability Density Functions with Mixtures of Truncated Exponentials  

E-Print Network [OSTI]

). Thus, the parameters to be estimated are a 0k , a 1k , a 2k ,a 3k , b (j) 1k ,b (j) 2k and b (j) 3k . Define ? ? (k) (x;? mk ) (abbreviated ? ? (k) (x)) as the initial MTE approximation for PDF f X (x) in interval D k .To estimate the parameters ? mk... = {a 0mk ,a 1mk ,a 2mk ,a 3mk ,b (j) 1mk ,b (j) 2mk ,b (j) 3mk } in (1), the discrete approximation to KL divergence between the standard PDF and the MTE approximation is minimized sub- ject to continuity, probability mass and non-negativity constraints...

Cobb, Barry R.; Shenoy, Prakash P.; Rumi, Rafael

2004-07-01T23:59:59.000Z

227

Improved approximate formulas for flux from cylindrical and rectangular sources  

SciTech Connect (OSTI)

This report provides two new approximate formulas for the flux at detector points outside the radial and axial extensions of a homogeneous cylindrical source and improved approximate formulas for the flux at points opposite rectangular surface sources. These formulas extend the range of geometries for which analytic approximations may be used by shield design engineers to make rapid scoping studies and check more extensive calculations for reasonableness. These formulas can be used to support skeptical, independent evaluations and are also valuable teaching tools for introducing shield designers to complex shield analyses.

Wallace, O.J.; Bokharee, S.A.

1993-03-01T23:59:59.000Z

228

AdS/CFT correspondence beyond its supergravity approximation  

E-Print Network [OSTI]

We will study the AdS/CFT correspondence beyond its supergravity approximation by deforming an effective field theory on AdS by string length scale effects. We will explicitly show that the conformal dimensions of both the relevant and the irrelevant operators receive correction from these string theory effects going beyond its supergravity approximation. However, as is expected from the full string theory on AdS (not just its supergravity approximation) being dual to the $\\mathcal{N}=4$ super-Yang-Mills theory, the conformal dimension of marginal operators do not receive any such corrections.

Mir Faizal; Ahmed Farag Ali; Ali Nassar

2014-05-18T23:59:59.000Z

229

Including Retro-Commissioning in Federal Energy Savings Performance Contracts  

Broader source: Energy.gov [DOE]

Guidance document on the importance of (and steps to) including retro-commissioning in Federal energy savings performance contracts (ESPCs).

230

Nuclear relativistic Hartree-Fock calculations including pions interacting with a scalar field  

SciTech Connect (OSTI)

The effect of pions on the nuclear shell structure is analyzed in a relativistic Hartree-Fock approximation (RHFA). The Lagrangian includes, in particular, a mixture of {pi}N pseudoscalar (PS) and pseudovector (PV) couplings, self-interactions of the scalar field {sigma} and a {sigma} - {pi} interaction that dresses pions with an effective mass (m*{sub {pi}}). It is found that an increase of m*{sub {pi}} strongly reduces the unrealistic effect of pions, keeping roughly unchanged their contribution to the total binding energy.

Marcos, S.; Lopez-Quelle, M.; Niembro, R.; Savushkin, L. N. [Departamento de Fisica Moderna, Universidad de Cantabria, Santander (Spain); Departamento de Fisica Aplicada, Universidad de Cantabria, Santander (Spain); Departamento de Fisica Moderna, Universidad de Cantabria, Santander (Spain); Department of Physics, St. Petersburg University for Telecommunications, St. Petersburg (Russian Federation)

2012-10-20T23:59:59.000Z

231

Approximation Algorithms for 2-Stage Stochastic Scheduling Problems  

Science Journals Connector (OSTI)

There has been a series of results deriving approximation algorithms for 2-stage discrete stochastic optimization problems, in which the probabilistic component of the input is given by means of "black box", from which the algorithm "learns" the distribution ...

David B. Shmoys; Mauro Sozio

2007-06-01T23:59:59.000Z

232

Approximate Dynamic Programming with Affine ADDs Scott Sanner  

E-Print Network [OSTI]

Approximate Dynamic Programming with Affine ADDs Scott Sanner NICTA and ANU Canberra, Australia and Multiagent Systems (AAMAS 2010), van der Hoek, Kaminka, Lespérance, Luck and Sen (eds.), May, 10­14, 2010

Sanner, Scott

233

On the mathematical treatment of the Born-Oppenheimer approximation  

E-Print Network [OSTI]

Motivated by a paper by B.T. Sutcliffe and R.G. Woolley, we present the main ideas used by mathematicians to show the accuracy of the Born-Oppenheimer approximation for molecules. Based on mathematical works on this approximation for molecular bound states, in scattering theory, in resonance theory, and for short time evolution, we give an overview of some rigourous results obtained up to now. We also point out the main difficulties mathematicians are trying to overcome and speculate on further developments. The mathematical approach does not fit exactly to the common use of the approximation in Physics and Chemistry. We criticize the latter and comment on the differences, contributing in this way to the discussion on the Born-Oppenheimer approximation initiated by B.T. Sutcliffe and R.G. Woolley. The paper neither contains mathematical statements nor proofs. Instead we try to make accessible mathematically rigourous results on the subject to researchers in Quantum Chemistry or Physics.

Thierry Jecko

2014-04-24T23:59:59.000Z

234

Numerical Test of Born-Oppenheimer Approximation in Chaotic Systems  

E-Print Network [OSTI]

We study the validity of the Born-Oppenheimer approximation in chaotic dynamics. Using numerical solutions of autonomous Fermi accelerators, we show that the general adiabatic conditions can be interpreted as the narrowness of the chaotic region in phase space.

Jeong-Bo Shim; Mahir S. Hussein; Martina Hentschel

2009-08-04T23:59:59.000Z

235

The local potential approximation in the background field formalism  

E-Print Network [OSTI]

Working within the familiar local potential approximation, and concentrating on the example of a single scalar field in three dimensions, we show that the commonly used approximation method of identifying the total and background fields, leads to pathologies in the resulting fixed point structure and the associated spaces of eigenoperators. We then show how a consistent treatment of the background field through the corresponding modified shift Ward identity, can cure these pathologies, restoring universality of physical quantities with respect to the choice of dependence on the background field, even within the local potential approximation. Along the way we point out similarities to what has been previously found in the f(R) approximation in asymptotic safety for gravity.

I. Hamzaan Bridle; Juergen A. Dietz; Tim R. Morris

2014-03-20T23:59:59.000Z

236

APPROXIMATE HARTREE TYPE WAVE FUNCTIONS AND MATRIX ELEMENTS FOR...  

Office of Scientific and Technical Information (OSTI)

APPROXIMATE HARTREE TYPE WAVE FUNCTIONS AND MATRIX ELEMENTS FOR THE K AND L SHELLS OF ATOMS AND IONS Re-direct Destination: Temp Data Fields Meyerott, R.E. Temp Data Storage 3:...

237

Human sciences The human sciences database contains approximately 254 academic  

E-Print Network [OSTI]

Human sciences The human sciences database contains approximately 254 academic journals and statistical reports on the following subjects: (comparative literature, theology, history and geography, education, psychology, arts, languages and Library Science) Social sciences The social sciences database

238

Testing and Comparing the Modified Anomalous Diffraction Approximation  

Science Journals Connector (OSTI)

The modified anomalous diffraction approximation (MADA) is used to predict absorption and extinction in water and ice clouds, but it does not predict the scattering phase function or asymmetry parameter g. In conjunction with g parameterizations, ...

David L. Mitchell; Anthony J. Baran; W. P. Arnott; C. Schmitt

2006-11-01T23:59:59.000Z

239

Bounds for the adiabatic approximation with applications to quantum computation  

SciTech Connect (OSTI)

We present straightforward proofs of estimates used in the adiabatic approximation. The gap dependence is analyzed explicitly. We apply the result to interpolating Hamiltonians of interest in quantum computing.

Jansen, Sabine; Ruskai, Mary-Beth; Seiler, Ruedi [Institut fuer Mathematik, TU Berlin, MA 7-2, Strasse des 17, Juni 136, D-10623 Berlin (Germany); Department of Mathematics, Tufts University, Medford, Massachusetts 02155 (United States); Institut fuer Mathematik, TU Berlin, MA 7-2, Strasse des 17, Juni 136, D-10623 Berlin (Germany)

2007-10-15T23:59:59.000Z

240

Revisiting the energetics of the ocean in Boussinesq approximation  

Science Journals Connector (OSTI)

Following a suggestion by Tailleux (2012), a consistent formulation of internal energy, the first law of thermodynamics, and the thermodynamic potentials for an ocean in Boussinesq approximation with a non-linear equation of state is given. A ...

Carsten Eden

Note: This page contains sample records for the topic "arabia include approximately" 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

The Born–Oppenheimer approximation: A toy version  

Science Journals Connector (OSTI)

The Born–Oppenheimer approximation which is central to the physics and chemistry of molecules and solids is illustrated by a one-dimensional toy model that is easily solved.

Gautam Gangopadhyay; Binayak Dutta-Roy

2004-01-01T23:59:59.000Z

242

Coulomb—Born—Oppenheimer approximation in Ps—H scattering  

Science Journals Connector (OSTI)

To improve the Coulomb-Born approximation (CBA) theory of ionization in positronium (Ps) and atom scattering, the effect of exchange is introduced. The nine-dimensional exchange amplitude for ionization of Ps in ...

Hasi Ray

2006-02-01T23:59:59.000Z

243

Approximation algorithms for grammar-based data compression  

E-Print Network [OSTI]

This thesis considers the smallest grammar problem: find the smallest context-free grammar that generates exactly one given string. We show that this problem is intractable, and so our objective is to find approximation ...

Lehman, Eric (Eric Allen), 1970-

2002-01-01T23:59:59.000Z

244

Automating Logic Rectification by Approximate SPFDs Yu-Shen Yang  

E-Print Network [OSTI]

Automating Logic Rectification by Approximate SPFDs Yu-Shen Yang Dept. of ECE University of Toronto changes or implement incremental rewiring-based optimization operations. Most existing automated logic

Veneris, Andreas

245

Regularity and approximation of systems arising in electromagnetic interrogation of  

E-Print Network [OSTI]

Regularity and approximation of systems arising in electromagnetic interrogation of dielectric describes the electromagnetic interrogation of dielectric materials. We address the well describing the electromagnetic in- terrogation of dielectric materials. Let E and H be the intensities

246

Approximate translation : media, narrative, and experience in urban design  

E-Print Network [OSTI]

Approximate translation is developed as a design process through which the place-embedded history of an urban environment can be understood, allowing for better design and intervention in that urban environment. Generally, ...

Crisman, Jonathan

2013-01-01T23:59:59.000Z

247

High energy light scattering in the generalized eikonal approximation  

Science Journals Connector (OSTI)

The generalized eikonal approximation method is applied to the study of light scattering by a dielectric medium. In this method, the propagation of light inside the medium is assumed...

Chen, Tuan W

1989-01-01T23:59:59.000Z

248

A constantfactor approximation algorithm for the kmedian problem  

E-Print Network [OSTI]

that this result is best possible via a reduction from the set cover problem. # moses@cs.stanford.edu. StanfordA constant­factor approximation algorithm for the k­median problem Moses Charikar # Sudipto Guha­factor approximation algorithm for the metric k­median prob­ lem. The k­median problem is one of the most well

Keinan, Alon

249

The time-dependent Born-Oppenheimer approximation  

E-Print Network [OSTI]

We explain why the conventional argument for deriving the time-dependent Born-Oppenheimer approximation is incomplete and review recent mathematical results, which clarify the situation and at the same time provide a systematic scheme for higher order corrections. We also present a new elementary derivation of the correct second-order time-dependent Born-Oppenheimer approximation and discuss as applications the dynamics near a conical intersection of potential surfaces and reactive scattering.

Gianluca Panati; Herbert Spohn; Stefan Teufel

2007-12-28T23:59:59.000Z

250

The slowly varying density approximation for the surface tension and surface energy of  

Science Journals Connector (OSTI)

We present a detailed study of the validity of the slowly varying density approximation to calculate the surface tension and the surface energy of Lennard-Jones fluids. To do so, we consider three explicit analytical expressions for the radial distribution function of the liquid phase, including one proposed by our research group, together with very accurate expressions for the liquid and vapour densities, also proposed by ourselves. The calculation of the surface tension from the direct correlation function using the Percus–Yevick and the hypernetted-chain approximations is also considered. Finally, our results are compared with those obtained by other authors by computer simulation, and also with those estimated via the general expressions (i.e., not in the ambit of the approximation studied here). We demonstrate that although the slowly varying density approximation is in good agreement with more complex expressions near the critical point, it is not adequate to calculate the surface energy and the surface tension of Lennard-Jones fluids at every temperature.

A Mulero; C Galán; F Cuadros

2003-01-01T23:59:59.000Z

251

FEMP Expands ESPC ENABLE Program to Include More Energy Conservation...  

Energy Savers [EERE]

(ESPC) ENABLE program to include two new energy conservation measures (ECMs): solar photovoltaic (PV) and simple one-for-one heating, ventilation, and air conditioning (HVAC)...

252

SciTech Connect: Microfluidic devices and methods including porous...  

Office of Scientific and Technical Information (OSTI)

porous polymer monolith may include surfaces terminated with iniferter species. Capture molecules may then be grafted to the monolith pores. Authors: Hatch, Anson V; Sommer,...

253

Including Retro-Commissioning in Federal Energy Savings Performance Contracts  

Broader source: Energy.gov [DOE]

Document describes guidance on the importance of (and steps to) including retro-commissioning in federal energy savings performance contracts (ESPCs).

254

Percentage of Total Natural Gas Industrial Deliveries included...  

U.S. Energy Information Administration (EIA) Indexed Site

Industrial Price Percentage of Total Industrial Deliveries included in Prices Vehicle Fuel Price Electric Power Price Period: Monthly Annual Download Series History Download...

255

Microfluidic devices and methods including porous polymer monoliths  

DOE Patents [OSTI]

Microfluidic devices and methods including porous polymer monoliths are described. Polymerization techniques may be used to generate porous polymer monoliths having pores defined by a liquid component of a fluid mixture. The fluid mixture may contain iniferters and the resulting porous polymer monolith may include surfaces terminated with iniferter species. Capture molecules may then be grafted to the monolith pores.

Hatch, Anson V; Sommer, Gregory J; Singh, Anup K; Wang, Ying-Chih; Abhyankar, Vinay V

2014-04-22T23:59:59.000Z

256

Solar Energy Education. Reader, Part II. Sun story. [Includes glossary  

SciTech Connect (OSTI)

Magazine articles which focus on the subject of solar energy are presented. The booklet prepared is the second of a four part series of the Solar Energy Reader. Excerpts from the magazines include the history of solar energy, mythology and tales, and selected poetry on the sun. A glossary of energy related terms is included. (BCS)

Not Available

1981-05-01T23:59:59.000Z

257

Range of a projectile, including air resistance. Introduction  

E-Print Network [OSTI]

resistance, it is easy to show (elementary physics classes) that if we throw a projectile with a speed vRange of a projectile, including air resistance. Introduction Here we study the motion of a projectile thrown through the air, including the important effects of air resistance.We will investi- gate

Young, A. Peter

258

Articles which include chevron film cooling holes, and related processes  

DOE Patents [OSTI]

An article is described, including an inner surface which can be exposed to a first fluid; an inlet; and an outer surface spaced from the inner surface, which can be exposed to a hotter second fluid. The article further includes at least one row or other pattern of passage holes. Each passage hole includes an inlet bore extending through the substrate from the inlet at the inner surface to a passage hole-exit proximate to the outer surface, with the inlet bore terminating in a chevron outlet adjacent the hole-exit. The chevron outlet includes a pair of wing troughs having a common surface region between them. The common surface region includes a valley which is adjacent the hole-exit; and a plateau adjacent the valley. The article can be an airfoil. Related methods for preparing the passage holes are also described.

Bunker, Ronald Scott; Lacy, Benjamin Paul

2014-12-09T23:59:59.000Z

259

What To Include In The Whistleblower Complaint? | National Nuclear Security  

National Nuclear Security Administration (NNSA)

To Include In The Whistleblower Complaint? | National Nuclear Security To Include In The Whistleblower Complaint? | National Nuclear Security Administration Our Mission Managing the Stockpile Preventing Proliferation Powering the Nuclear Navy Emergency Response Recapitalizing Our Infrastructure Continuing Management Reform Countering Nuclear Terrorism About Us Our Programs Our History Who We Are Our Leadership Our Locations Budget Our Operations Media Room Congressional Testimony Fact Sheets Newsletters Press Releases Speeches Events Social Media Video Gallery Photo Gallery NNSA Archive Federal Employment Apply for Our Jobs Our Jobs Working at NNSA Blog What To Include In The Whistleblower Complaint? Home > About Us > Our Operations > Management and Budget > Whistleblower Program > What To Include In The Whistleblower Complaint? What To Include In The Whistleblower Complaint?

260

The Monte Carlo Independent Column Approximation Model Intercomparison  

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

The Monte Carlo Independent Column Approximation Model Intercomparison The Monte Carlo Independent Column Approximation Model Intercomparison Project (McMIP) Barker, Howard Meteorological Service of Canada Cole, Jason Meteorological Service of Canada Raisanen, Petri Finnish Meteorological Institute Pincus, Robert NOAA-CIRES Climate Diagnostics Center Morcrette, Jean-Jacques European Centre for Medium-Range Weather Forecasts Li, Jiangnan Canadian Center for Climate Modelling Stephens, Graeme Colorado State University Vaillancourt, Paul Environment Canada Oreopoulos, Lazaros JCET/UMBC and NASA/GSFC Siebesma, Pier KNMI Los, Alexander KNMI Clothiaux, Eugene The Pennsylvania State University Randall, David Colorado State University Iacono, Michael Atmospheric & Environmental Research, Inc. Category: Radiation The Monte Carlo Independent Column Approximation (McICA) method for

Note: This page contains sample records for the topic "arabia include approximately" 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

Kadanoff–Baym equations and non-Markovian Boltzmann equation in generalized T-matrix approximation  

Science Journals Connector (OSTI)

A recently developed method [Semkat et al. Phys. Rev. E 59 1557 (1999); Kremp et al. in Progress in Nonequilibrium Green’s Functions (World Scientific Singapore 2000) p. 34] for incorporating initial binary correlations into the Kadanoff–Baym equations (KBE) is used to derive a generalized T-matrix approximation for the self-energies. It is shown that the T-matrix obtains additional contributions arising from initial correlations. Using these results and taking the time-diagonal limit of the KBE a generalized quantum kinetic equation in binary collision approximation is derived. This equation is a far-reaching generalization of Boltzmann-type kinetic equations: It self-consistently includes memory effects (retardation off-shell T-matrices) as well as many-particle effects (damping in-medium T-matrices) and spin-statistics effects (Pauli-blocking).

D. Semkat; D. Kremp; M. Bonitz

2000-01-01T23:59:59.000Z

262

The Gamow-Teller response within Skyrme random-phase approximation plus particle-vibration coupling  

E-Print Network [OSTI]

Although many random-phase approximation (RPA) calculations of the Gamow-Teller (GT) response exist, this is not the case for calculations going beyond the mean-field approximation. We apply a consistent model that includes the coupling of the GT resonance to low-lying vibrations, to nuclei of the $fp$ shell. Among other motivations, our goal is to see if the particle-vibration coupling can redistribute the low-lying GT$^+$ strength that is relevant for electron-capture processes in core-collapse supernova. We conclude that the lowering and fragmentation of that strength are consistent with the experimental findings and validate our model. However, the particle-vibration coupling cannot account for the quenching of the total value of the low-lying strength.

Yifei Niu; Gianluca Colo; Marco Brenna; Marco Brenna; Pier Francesco Bortignon; Jie Meng

2012-03-28T23:59:59.000Z

263

Solution of the Schrodinger equation for the inverse-square potential using Pade approximants  

E-Print Network [OSTI]

to J@(x) Order of the approximant which approximates J (x) to a relative o -4- error less than 10 44 Order of the approximant which approximates Jl(x) to a relative -4 error less than 10 10 Order of the approximant which approximates J4(x) to a... relative -4- error less than 10 Figure Page Order of the approximant which approximates J&(x) to a relative error less than 10 ? 4 4c 12 14 Relative error in the 4, 4 approximant to J. (x) Relative error in the 4, 4 approximant to J4 (x) 4r...

Golden, Jack Emitt

1972-01-01T23:59:59.000Z

264

approximately 200 megawatts (MWs) of power from TCEP, making  

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

approximately 200 megawatts (MWs) of power from TCEP, making approximately 200 megawatts (MWs) of power from TCEP, making it the first U.S. purchase by a utility of low-carbon power from a commercial-scale, coal-based power plant with carbon capture. The 400-MW TCEP plant is a first-of-its-kind integrated gasification combined cycle (IGCC) poly-generation facility capable of capturing 90 percent of the carbon dioxide (CO 2 ) it produces. The $2.4-billion plant was a third round selection under DOE's Clean Coal Power Initiative

265

Improved approximation algorithm for the jump number of interval orders  

Science Journals Connector (OSTI)

Abstract The jump number problem for posets is to find a linear extension in which the number of incomparable adjacent pairs is minimized. In this paper the class of interval orders is considered. Three 3/2-approximation algorithms for this problem have been known for some time. By a previous work of Mitas, the problem may be reformulated as a subgraph packing task. We prove that the problem reduces also to a set cover task, and we establish an improved bound of 1.484 to the approximation ratio of the jump number on interval orders.

Przemys?aw Krysztowiak

2013-01-01T23:59:59.000Z

266

Optimal approximation of harmonic growth clusters by orthogonal polynomials  

SciTech Connect (OSTI)

Interface dynamics in two-dimensional systems with a maximal number of conservation laws gives an accurate theoreticaI model for many physical processes, from the hydrodynamics of immiscible, viscous flows (zero surface-tension limit of Hele-Shaw flows), to the granular dynamics of hard spheres, and even diffusion-limited aggregation. Although a complete solution for the continuum case exists, efficient approximations of the boundary evolution are very useful due to their practical applications. In this article, the approximation scheme based on orthogonal polynomials with a deformed Gaussian kernel is discussed, as well as relations to potential theory.

Teodorescu, Razvan [Los Alamos National Laboratory

2008-01-01T23:59:59.000Z

267

U-182: Microsoft Windows Includes Some Invalid Certificates | Department of  

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

82: Microsoft Windows Includes Some Invalid Certificates 82: Microsoft Windows Includes Some Invalid Certificates U-182: Microsoft Windows Includes Some Invalid Certificates June 4, 2012 - 7:00am Addthis PROBLEM: A vulnerability was reported in Microsoft Windows. A remote user may be able to spoof code signing signatures. PLATFORM: Version(s): XP SP3, 2003 SP2, Vista SP2, 2008 SP2, 7 SP1, 2008 R2 SP1; and prior service packs ABSTRACT: The operating system includes some invalid intermediate certificates. The vulnerability is due to the certificate authorities and not the operating system itself. Reference Links: Security tracker ID 1027114 GENERIC-MAP-NOMATCH Vendor Advisory IMPACT ASSESSMENT: High Discussion: The invalid certificates and their thumbprints are: Microsoft Enforced Licensing Intermediate PCA: 2a 83 e9 02 05 91 a5 5f c6

268

FINITE ELEMENT ANALYSIS OF STEEL WELDED COVERPLATE INCLUDING COMPOSITE DOUBLERS  

E-Print Network [OSTI]

With the increasing focus on welded bridge members resulting in crack initiation and propagation, there is a large demand for creative solutions. One of these solutions includes the application of composite doublers over the critical weld. In order...

Petri, Brad

2008-05-15T23:59:59.000Z

269

Search for Earth-like planets includes LANL star analysis  

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

Search for earth-like planets Search for Earth-like planets includes LANL star analysis The mission will not only be able to search for planets around other stars, but also yield...

270

atlantic region including: Topics by E-print Network  

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

R: L. Tossey, T. Beeson, Parks, B. TruittTNC, UD MPEO staff 2 Climate scenarios of sea level rise for the northeast Atlantic Ocean: a study including the effects of ocean...

271

INTRODUCTION Embryonic development is sensitive to many factors, including  

E-Print Network [OSTI]

, mothers can attempt to maintain their developing embryos at an optimal temperature, and thus The Journal RESEARCH ARTICLE Maternal influences on early development: preferred temperature prior to oviposition1346 INTRODUCTION Embryonic development is sensitive to many factors, including hormones, toxins

Denardo, Dale

272

Limited Personal Use of Government Office Equipment including Information Technology  

Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

The Order establishes requirements and assigns responsibilities for employees' limited personal use of Government resources (office equipment and other resources including information technology) within DOE, including NNSA. The Order is required to provide guidance on appropriate and inappropriate uses of Government resources. This Order was certified 04/23/2009 as accurate and continues to be relevant and appropriate for use by the Department. Certified 4-23-09. No cancellation.

2005-01-07T23:59:59.000Z

273

Percentage of Total Natural Gas Commercial Deliveries included in Prices  

Gasoline and Diesel Fuel Update (EIA)

City Gate Price Residential Price Percentage of Total Residential Deliveries included in Prices Commercial Price Percentage of Total Commercial Deliveries included in Prices Industrial Price Percentage of Total Industrial Deliveries included in Prices Electric Power Price Period: Monthly Annual City Gate Price Residential Price Percentage of Total Residential Deliveries included in Prices Commercial Price Percentage of Total Commercial Deliveries included in Prices Industrial Price Percentage of Total Industrial Deliveries included in Prices Electric Power Price Period: Monthly Annual Download Series History Download Series History Definitions, Sources & Notes Definitions, Sources & Notes Show Data By: Data Series Area May-13 Jun-13 Jul-13 Aug-13 Sep-13 Oct-13 View History U.S. 63.3 59.3 57.9 57.0 57.4 61.3 1983-2013 Alabama 71.7 71.0 68.5 68.2 68.4 66.7 1989-2013 Alaska 94.1 91.6 91.1 91.0 92.3 92.6 1989-2013 Arizona 84.0 83.0 81.6 80.3 82.8 82.7 1989-2013 Arkansas 37.8 28.3 28.1 28.6 26.7 28.0 1989-2013

274

Percentage of Total Natural Gas Industrial Deliveries included in Prices  

Gasoline and Diesel Fuel Update (EIA)

City Gate Price Residential Price Percentage of Total Residential Deliveries included in Prices Commercial Price Percentage of Total Commercial Deliveries included in Prices Industrial Price Percentage of Total Industrial Deliveries included in Prices Electric Power Price Period: Monthly Annual City Gate Price Residential Price Percentage of Total Residential Deliveries included in Prices Commercial Price Percentage of Total Commercial Deliveries included in Prices Industrial Price Percentage of Total Industrial Deliveries included in Prices Electric Power Price Period: Monthly Annual Download Series History Download Series History Definitions, Sources & Notes Definitions, Sources & Notes Show Data By: Data Series Area May-13 Jun-13 Jul-13 Aug-13 Sep-13 Oct-13 View History U.S. 16.5 16.3 16.0 16.2 16.6 16.9 2001-2013 Alabama 22.1 21.7 21.6 22.8 22.0 22.7 2001-2013 Alaska 100.0 100.0 100.0 100.0 100.0 100.0 2001-2013 Arizona 13.4 15.7 15.3 13.8 13.7 13.9 2001-2013 Arkansas 1.7 1.4 1.2 1.4 1.3 1.5 2001-2013

275

On Approximating the Translational Velocity of Vortex Rings  

E-Print Network [OSTI]

from this configuration and the system scaling. Here, the accuracy of this approximation is presented orifice in a flat plate contain a converging radial component of velocity. For both configurations. By this definition, the piston velocity is the average jet velocity passing through the orifice independent

Mohseni, Kamran

276

The Exemplar Breakpoint Distance for nontrivial genomes cannot be approximated  

E-Print Network [OSTI]

The Exemplar Breakpoint Distance for non­trivial genomes cannot be approximated Guillaume Blin 1 ­ France guillaume.fertin@univ­nantes.fr Abstract. A promising and active field of comparative genomics con­ sists in comparing two genomes by establishing a one­to­one correspon­ dence (i.e., a matching) between

Fertin, Guillaume

277

Incorporating Velocity Shear into the Magneto-Boussinesq Approximation  

E-Print Network [OSTI]

Motivated by consideration of the solar tachocline, we derive, via an asymptotic procedure, a new set of equations incorporating velocity shear and magnetic buoyancy into the Boussinesq approximation. We demonstrate, by increasing the magnetic field scale height, how these equations are linked to the magneto-Boussinesq equations of Spiegel and Weiss (1982).

Bowker, Jordan A; Kersalé, Evy

2014-01-01T23:59:59.000Z

278

MARKOV CHAIN APPROXIMATIONS FOR TRANSITION DENSITIES OF LEVY PROCESSES  

E-Print Network [OSTI]

MARKOV CHAIN APPROXIMATIONS FOR TRANSITION DENSITIES OF L´EVY PROCESSES ALEKSANDAR MIJATOVI for the existence of transition densities of X, we establish sharp convergence rates of the normalised probability class with applications in diverse areas such as mathematical finance, risk management, insurance

279

Improved approximation algorithms for a capacitated facility location problem  

E-Print Network [OSTI]

that ordinary randomized rounding rarely generates a feasible solution to the associated set covering problemImproved approximation algorithms for a capacitated facility location problem Fabi'an A. Chudak. There is a set of demand locations that require service from facilities; there is a set of locations at which

Keinan, Alon

280

CS 105: Algorithms (Grad) Approximation Algorithms (continued) Feb 21, 2005  

E-Print Network [OSTI]

.g. Clique. = O(log n), e.g. Set Cover. = O(1), e.g. Vertex Cover. Page 1 of 7 #12;CS 105: Algorithms (Grad Algorithms: Vertex Cover 1.1 Introduction to Approximation Algorithms There are several optimization problems (TSP) - finding a minimum cost tour of all cities � Vertex Cover - find minimum set of vertex

Chakrabarti, Amit

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


281

Geometric and capacitated set cover Exact and approximation algorithms for  

E-Print Network [OSTI]

Geometric and capacitated set cover ' & $ % Exact and approximation algorithms for geometric and capacitated set cover problems Piotr Berman Pennsylvania State University Marek Karpinski Bonn University Andrzej Lingas Lund University July 22, 2010 COCOON 2010 Page 1 #12;Geometric and capacitated set cover

Berman, Piotr

282

LP-Based Approximation Algorithms for Reliable Resource Allocation  

Science Journals Connector (OSTI)

......technique for analyzing the minimum set cover problem. For a special case of RRA...technique for analyzing the minimum set cover problem. For a special case of RRA...UFL can be easily reduced from the set cover problem [18] that is hard to approximate......

Kewen Liao; Hong Shen

2014-01-01T23:59:59.000Z

283

CP-networks: semantics, complexity, approximations and extensions  

E-Print Network [OSTI]

CP-networks: semantics, complexity, approximations and extensions F. Rossi, K. B. Venable Dept Constraint Computation Centre, University College Cork Cork, Ireland tw@4c.ucc.ie July 23, 2002 Abstract CP-networks are an elegant and compact qualitative framework for ex- pressing preferences. Unfortunately, reasoning with CP

Walsh, Toby

284

A fast approximation technique for power grid analysis  

Science Journals Connector (OSTI)

In this paper, we present a fast approximation algorithm for computing IR drops in a VLSI power grid. Assuming that the grid does not have pathological defects, the algorithm can estimate IR drops to within 5% average error, with a run time of less than ...

Mysore Sriram

2011-01-01T23:59:59.000Z

285

New approximation algorithms for minimum cycle bases of graphs  

Science Journals Connector (OSTI)

We consider the problem of computing an approximate minimum cycle basis of an undirected edge-weighted graph G with m edges and n vertices; the extension to directed graphs is also discussed. In this problem, a {0, 1} incidence vector ...

Telikepalli Kavitha; Kurt Mehlhorn; Dimitrios Michail

2007-02-01T23:59:59.000Z

286

An Example of Uniform Approximation near a Caustic  

Science Journals Connector (OSTI)

In the region inside a caustic having two rays through each point ray acoustics approximates a sound field due to a point harmonic source of frequency ? by e?Im(T1)[A1ei?T 1+A2e(i?T 2+ir/2) ]. When the caustic is smooth Ludwig approximates the field everywhere by a constant times e i?? [B 1 Ai (?? 2 3 ?)?i? ? 1 2 B 2 Ai ?(?? 1 2 ?)] where Ai is the usual Airy function. An example of Ludwig's approximation is presented in parameterless form for the unbounded layered medium having speed c(z)?=?z ? 1 2 . This approximation of course agrees with ray theory on the source side of the caustic rises to a large but finite value near the caustic and exhibits exponential decay on the other side of the caustic. For the record the results are expressed in horizontal range x and depth z with the source at x = 0 z = z 0: T n ?=?( 2 3 )[??+?(???1) n ?] 1 2 [????(??1?) n ?/2] where ? = z + z 0 and r2 = 4zz0 ? x2; An ?2 = 2r(? + (? 1) n ?); 2? = ? ? R where R 2 = (z ? z 0)2 + x 2 3? 1 2 ?=???+?R ; B 1 2 ?=?2?? 1 3 /(rR 2 ) and B 2 ?=?? ? 1 2 /R .

1974-01-01T23:59:59.000Z

287

Managing Approximate Models in Evolutionary Aerodynamic Design Optimization  

E-Print Network [OSTI]

Managing Approximate Models in Evolutionary Aerodynamic Design Optimization Yaochu Jin yaochu jin­ mization problems that are discontinuous, multi­modal and multi­objective [1, 2]. Aerodynamic structural to high complexity of the aerodynamic analysis and large number of evaluations needed in the evolutionary

Coello, Carlos A. Coello

288

Gerla Giangiacomo Fuzzy logic. Mathematical tools for approximate reasoning. (English)  

E-Print Network [OSTI]

the author's approach to fuzzy control. Based upon a certain version of fuzzified logical programming, viz. Herbrand models for fuzzy logics, the author interprets lists of fuzzy control rules by fuzzy logicGerla Giangiacomo Fuzzy logic. Mathematical tools for approximate reasoning. (English) [B] Trends

Gerla, Giangiacomo

289

On the mathematical treatment of the Born-Oppenheimer approximation  

SciTech Connect (OSTI)

Motivated by the paper by Sutcliffe and Woolley [“On the quantum theory of molecules,” J. Chem. Phys. 137, 22A544 (2012)], we present the main ideas used by mathematicians to show the accuracy of the Born-Oppenheimer approximation for molecules. Based on mathematical works on this approximation for molecular bound states, in scattering theory, in resonance theory, and for short time evolution, we give an overview of some rigorous results obtained up to now. We also point out the main difficulties mathematicians are trying to overcome and speculate on further developments. The mathematical approach does not fit exactly to the common use of the approximation in Physics and Chemistry. We criticize the latter and comment on the differences, contributing in this way to the discussion on the Born-Oppenheimer approximation initiated by Sutcliffe and Woolley. The paper neither contains mathematical statements nor proofs. Instead, we try to make accessible mathematically rigourous results on the subject to researchers in Quantum Chemistry or Physics.

Jecko, Thierry, E-mail: thierry.jecko@u-cergy.fr [AGM, UMR 8088 du CNRS, Université de Cergy-Pontoise, Département de mathématiques, site de Saint Martin, 2 avenue Adolphe Chauvin, F-95000 Pontoise (France)] [AGM, UMR 8088 du CNRS, Université de Cergy-Pontoise, Département de mathématiques, site de Saint Martin, 2 avenue Adolphe Chauvin, F-95000 Pontoise (France)

2014-05-15T23:59:59.000Z

290

Decoupling electrons and nuclei without the Born-Oppenheimer approximation  

E-Print Network [OSTI]

Decoupling electrons and nuclei without the Born-Oppenheimer approximation Patrick Cassam. The EN-GMFCI is a new paradigm for quantum chemistry that bypasses the tradi- tional Born-Oppenheimer (BO;1 Introduction The Born-Oppenheimer (BO) potential energy surface (PES) is one of the main paradigm of quantum

Paris-Sud XI, Université de

291

Preprint UC Davis Math 199930 A continuum approximation for the  

E-Print Network [OSTI]

Preprint UC Davis Math 1999­30 A continuum approximation for the excitations of the (1; 1 and Shannon Starr Department of Mathematics University of California, Davis Davis, CA 95616­8633, USA bolina, with an appropriate scaling, the energy of low­ lying excitations of the (1; 1; : : : ; 1) interface in the d

292

HEREDITARY APPROXIMATION PROPERTY W. B. JOHNSON AND A. SZANKOWSKI  

E-Print Network [OSTI]

HEREDITARY APPROXIMATION PROPERTY W. B. JOHNSON AND A. SZANKOWSKI Abstract. If X is a Banach space, trace formula. Johnson was supported in part by NSF DMS-0500292, DMS-1001321, and the U.S.-Israel Binational Science Foundation. 1 #12;2 W. B. JOHNSON AND A. SZANKOWSKI subsymmetric basis unless

Johnson, William B.

293

Approximate inference for spatial functional data on massively parallel processors  

Science Journals Connector (OSTI)

With continually increasing data sizes, the relevance of the big n problem of classical likelihood approaches is greater than ever. The functional mixed-effects model is a well established class of models for analyzing functional data. Spatial functional ... Keywords: Functional data analysis, Functional mixed-effects model, GPU, Gaussian processes, Likelihood analysis, Operator approximations

Lars Lau Rakêt; Bo Markussen

2014-04-01T23:59:59.000Z

294

Approximate hedging problem with transaction costs in stochastic volatility markets  

E-Print Network [OSTI]

Approximate hedging problem with transaction costs in stochastic volatility markets Thai Huu Nguyen stochastic volatility markets with transaction costs using a new form for enlarged volatility in Leland between the present setting and high frequency markets with transaction costs. Possibilities to improve

Paris-Sud XI, Université de

295

Approximating the Probability of an Itemset being Nele Dexters  

E-Print Network [OSTI]

gives a statistical approach to the success probability Sl, the probability that a set consisting of lApproximating the Probability of an Itemset being Frequent Nele Dexters University of Antwerp algorithms, the probability that an itemset is a candidate and the probability that a set is frequent (a

Antwerpen, Universiteit

296

Approximate Minimum-Energy Multicasting in Wireless Ad Hoc Networks  

E-Print Network [OSTI]

and a set of destination nodes, the problem is to build a minimum-energy multicast tree for the requestApproximate Minimum-Energy Multicasting in Wireless Ad Hoc Networks Weifa Liang, Senior Member, IEEE Abstract--A wireless ad hoc network consists of mobile nodes that are equipped with energy

Liang, Weifa

297

Expressive Power and Approximation Errors of Restricted Boltzmann Machines  

E-Print Network [OSTI]

#12;Expressive Power and Approximation Errors of Restricted Boltzmann Machines Guido F. Montufar1 Boltzmann Machines (RBMs) depending on the number of units that they contain, and which are representative Machine (RBM) [23, 10] is a learning system con- sisting of two layers of binary stochastic units

298

Di usion Approximation of Radiative Transfer Equations in a Channel  

E-Print Network [OSTI]

direction. 1 #12; 1 Introduction Radiative transport equations were #12;rst used to describe the propagationDi#11;usion Approximation of Radiative Transfer Equations in a Channel Guillaume Bal Department by a di#11;usion equation. However, the thickness of the crust is of the order of the transport mean free

Bal, Guillaume

299

Numerical study on the validity of the diffusion approximation  

E-Print Network [OSTI]

of photons can be accurately modeled by the radiative transport equation (RTE).9,10 Because and the radiative transport as implemented by Monte Carlo simulation in the cases of point and ball sources. Our of the difficulties in handling the RTE directly, the diffusion approximation to the transport equation has been

Virginia Tech

300

Approximate Bayesian Computations Done Exactly: Towards a Thousand Human Genomes  

E-Print Network [OSTI]

Approximate Bayesian Computations Done Exactly: Towards a Thousand Human Genomes Principal of California, Irvine, USA January 28, 2011 Abstract Currently, 1000 whole human genomes are being sequenced. It is becoming exceedingly difficult to extract critical information from such extensive population-level genomic

Sainudiin, Raazesh

Note: This page contains sample records for the topic "arabia include approximately" 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

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

302

Moving boundary approximation for curved streamer ionization fronts: Solvability analysis  

Science Journals Connector (OSTI)

The minimal density model for negative streamer ionization fronts is investigated. An earlier moving boundary approximation for this model consisted of a “kinetic undercooling” type boundary condition in a Laplacian growth problem of Hele-Shaw type. Here we derive a curvature correction to the moving boundary approximation that resembles surface tension. The calculation is based on solvability analysis with unconventional features, namely, there are three relevant zero modes of the adjoint operator, one of them diverging; furthermore, the inner-outer matching ahead of the front must be performed on a line rather than on an extended region; and the whole calculation can be performed analytically. The analysis reveals a relation between the fields ahead and behind a slowly evolving curved front, the curvature and the generated conductivity. This relation forces us to give up the ideal conductivity approximation, and we suggest to replace it by a charge neutrality approximation. This implies that the electric potential in the streamer interior is no longer constant but solves a Laplace equation; this leads to a Muskat-type problem.

Fabian Brau, Benny Davidovitch, and Ute Ebert

2008-11-21T23:59:59.000Z

303

The Born–Oppenheimer Approximation to the Wave Operators  

Science Journals Connector (OSTI)

We apply the Born–Oppenheimer approximation to a scattering problem. We consider a diatomic molecule with short-range potential separating into two atoms. Using our earlier mathematical results we construct a leading order expansion to the wave operator for this scattering channel. We comment on limitation and possible extensions of this work.

Armin Kargol

1999-01-01T23:59:59.000Z

304

Self-similar and charged spheres in the diffusion approximation  

E-Print Network [OSTI]

We study spherical, charged and self--similar distributions of matter in the diffusion approximation. We propose a simple, dynamic but physically meaningful solution. For such a solution we obtain a model in which the distribution becomes static and changes to dust. The collapse is halted with damped mass oscillations about the absolute value of the total charge.

Barreto, W

1999-01-01T23:59:59.000Z

305

Generalized local-density approximation for spherical potentials  

Science Journals Connector (OSTI)

An alternative density functional for the spherical approximation of cell potentials is formulated. It relies on overlapping atomic spheres for the calculation of the kinetic energy, similar to the atomic sphere approximation (ASA), however, a shape correction is used that has the same form as the interstitial treatment in the nonoverlapping muffin-tin (MT) approach. The intersite Coulomb energy is evaluated using the Madelung energy as computed in the MT approach, while the on-site Coulomb energy is calculated using the ASA. The Kohn-Sham equations for the functional are then solved self-consistently. The ASA is known to give poor elastic constants and good point defect energies. Conversely the MT approach gives good elastic constants and poor point defect energies. The proposed new functional maintains the simplicity of the spherical potentials found in the ASA and MT approaches, but gives good values for both elastic constants and point defects. This solution avoids a problem, absent in the ASA but suffered by the MT approximation, of incorrect distribution of site charges when charge transfer is large. Relaxation of atomic positions is thus facilitated. Calculations confirm that the approach gives similar elastic constants to the MT approximation, and defect formation energies similar to those obtained with ASA.

X.-G. Zhang and D. M. C. Nicholson

1999-08-15T23:59:59.000Z

306

Gluon Condensate in Pion Superfluid beyond Mean Field Approximation  

E-Print Network [OSTI]

We study gluon condensate in a pion superfluid, through calculating the equation of state of the system in the Nambu-Jona-Lasinio model. While in mean field approximation the growing pion condensate leads to an increasing gluon condensate, meson fluctuations reduce the gluon condensate and the broken scalar symmetry can be smoothly restored at finite isospin density.

Yin Jiang; Pengfei Zhuang

2011-03-04T23:59:59.000Z

307

Improved Approximations for Max Set Splitting and Max NAE SAT  

E-Print Network [OSTI]

Improved Approximations for Max Set Splitting and Max NAE SAT #3; Jiawei Zhang and Yinyu Ye y Nanjing, 210093, P.R.China August 16, 2000, Revised January 22, 2001. #3; This research was supported Fudan University, Shanghai, R.R.China. z This work was done while the author was visiting Computational

Ye, Yinyu

308

Different approximations of shallow fluid flow over an obstacle  

SciTech Connect (OSTI)

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

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

1996-08-01T23:59:59.000Z

309

Honda Smart Home to Include Berkeley Lab Ventilation Controller  

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

Honda Smart Home to Include Berkeley Lab Ventilation Controller Honda Smart Home to Include Berkeley Lab Ventilation Controller Honda smart home October 2013 October-November Special Focus: Energy Efficiency, Buildings, and the Electric Grid Honda Motor Company Inc is proceeding with plans to build a Smart Home in Davis, California, to demonstrate the latest in renewable energy technologies and energy efficiency. The home is expected to produce more energy than is consumed, demonstrating how the goal of "zero net energy" can be met in the near term future. A ventilation controller developed by researchers at Berkeley Lab's Environmental Energy Technologies Division (EETD) will be included in the smart home. EETD is currently working with the developers of the home control system to integrate its control algorithms.

310

DOE Revises its NEPA Regulations, Including Categorical Exclusions |  

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

Revises its NEPA Regulations, Including Categorical Exclusions Revises its NEPA Regulations, Including Categorical Exclusions DOE Revises its NEPA Regulations, Including Categorical Exclusions September 30, 2011 - 2:30pm Addthis On September 27, 2011, the Department of Energy (DOE) approved revisions to its National Environmental Policy Act (NEPA) regulations, and on September 28th, submitted the revisions to the Federal Register. The final regulations, which become effective 30 days after publication in the Federal Register, are the culmination of a 2-year process to review and update DOE's NEPA implementing procedures. This process involved internal evaluation, public participation, and Council on Environmental Quality (CEQ) review. The revisions are designed to focus Departmental resources on projects with the potential for significant environmental impact, to better

311

Introduction to Small-Scale Photovoltaic Systems (Including RETScreen Case  

Open Energy Info (EERE)

Introduction to Small-Scale Photovoltaic Systems (Including RETScreen Case Introduction to Small-Scale Photovoltaic Systems (Including RETScreen Case Study) (Webinar) Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Introduction to Small-Scale Photovoltaic Systems (Including RETScreen Case Study) (Webinar) Focus Area: Solar Topics: Market Analysis Website: www.leonardo-energy.org/webinar-introduction-small-scale-photovoltaic- Equivalent URI: cleanenergysolutions.org/content/introduction-small-scale-photovoltaic Language: English Policies: Deployment Programs DeploymentPrograms: Project Development This video teaches the viewer about photovoltaic arrays and RETscreen's photovoltaic module, which can be used to project the cost and production of an array. An example case study was

312

Including Tunneling in Non-Born–Oppenheimer Simulations  

Science Journals Connector (OSTI)

Including Tunneling in Non-Born–Oppenheimer Simulations ... We note that tunneling may be included in the modeling of electronically nonadiabatic processes by other methods as well, for example, quantal wave packet methods where the wave packet is not restricted to follow a classical trajectory,(18) path integral dynamics,(19-21) and the initial value representation,(22) but these methods will require more development of efficient computational strategies for their practical application to complex systems, whereas the method proposed here has a cost comparable to non-Born–Oppenheimer (NBO) trajectory calculations that do not include tunneling. ... We also ran Born–Oppenheimer trajectories with the same total energy on the adiabatic ground state for comparison. ...

Jingjing Zheng; Rubén Meana-Pañeda; Donald G. Truhlar

2014-05-15T23:59:59.000Z

313

Thin film solar cell including a spatially modulated intrinsic layer  

DOE Patents [OSTI]

One or more thin film solar cells in which the intrinsic layer of substantially amorphous semiconductor alloy material thereof includes at least a first band gap portion and a narrower band gap portion. The band gap of the intrinsic layer is spatially graded through a portion of the bulk thickness, said graded portion including a region removed from the intrinsic layer-dopant layer interfaces. The band gap of the intrinsic layer is always less than the band gap of the doped layers. The gradation of the intrinsic layer is effected such that the open circuit voltage and/or the fill factor of the one or plural solar cell structure is enhanced.

Guha, Subhendu (Troy, MI); Yang, Chi-Chung (Troy, MI); Ovshinsky, Stanford R. (Bloomfield Hills, MI)

1989-03-28T23:59:59.000Z

314

Solar Energy Education. Renewable energy: a background text. [Includes glossary  

SciTech Connect (OSTI)

Some of the most common forms of renewable energy are presented in this textbook for students. The topics include solar energy, wind power hydroelectric power, biomass ocean thermal energy, and tidal and geothermal energy. The main emphasis of the text is on the sun and the solar energy that it yields. Discussions on the sun's composition and the relationship between the earth, sun and atmosphere are provided. Insolation, active and passive solar systems, and solar collectors are the subtopics included under solar energy. (BCS)

Not Available

1985-01-01T23:59:59.000Z

315

Watson Library enhancements to include new service desk  

E-Print Network [OSTI]

12/5/13 KU Libraries News: Watson Library enhancements to include new service desk www.lib.ku.edu/news/newservicedesk.shtml 1/1 Contact Us The University of Kansas Libraries Lawrence, KS 66045 (785) 864-8983 Copyright © 2013 by the University... of Kansas Watson Library enhancements to include new service desk The University of Kansas Libraries is adding a new service desk to Watson Library to enhance the user experience and draw attention to new and existing resources. The desk, which...

2008-01-01T23:59:59.000Z

316

Prediction of future well performance, including reservoir depletion effects  

SciTech Connect (OSTI)

In the past, the reservoir material balance (voidage) effects occurring between the end of the measured (known) production history and future Inflow Performance Relationship (IPR) time levels have been commonly ignored in the computation of the future IPR behavior. Neglecting the reservoir voidage that occurs during the time interval between the end of the known production history and the future IPR time levels results in erroneous estimates of the future IPR behavior. A detailed description is given of the mathematically rigorous technique that has been used in the development of a multilayer well performance simulator that properly accounts for the reservoir voidage effects. Some of the more significant results are also presented of an extensive effort to develop an accurate and computationally efficient well performance simulation model. The reservoir can be considered to be multilayered, with mixed reservoir layer completion types and outer boundary shapes, drainage areas and boundary conditions. The well performance model can be used to simulate performance in three different operating modes: (1) constant wellhead rate, (2) constant bottomhole pressure, and (3) constant wellhead pressure. The transient performance of vertical, vertically fractured and horizontal wells can be simulated with this well performance model. The well performance model uses mathematically rigorous transient solutions and not simply the approximate solutions for each of the well types, as do most of the other commercially available well performance models.

Poe, B.D. Jr.; Elbel, J.L.; Spath, J.B.; Wiggins, M.L.

1995-12-31T23:59:59.000Z

317

Requirements: A minimum of 15 PSYC credits, including  

E-Print Network [OSTI]

» Three other 2000-3000-level PSYC courses (any area) No more than 3 credits of PSYC 3889 or 3999 canRequirements: A minimum of 15 PSYC credits, including: » One Area I course » One Area II course) ___2100 (Principles of Research in Psychology) Area I. Social, Developmental, Clinical, & Industrial

Alpay, S. Pamir

318

Procedures in Modules (1) Including all procedures within modules  

E-Print Network [OSTI]

Procedures in Modules (1) Including all procedures within modules works very well in almost all designing these if possible #12;Procedures in Modules (2) These are very much like internal procedures Works very well in almost all programs Everything accessible in the module can also be used in the procedure

319

Free Energy Efficiency Kit includes CFL light bulbs,  

E-Print Network [OSTI]

Free Energy Efficiency Kit Kit includes CFL light bulbs, spray foam, low-flow shower head, and more! Building Science 101 Presentation BPI Certified Building Professionals will present home energy efficiency for discounted energy assessments. FREE HOME ENERGY EFFICIENCY SEMINAR N e w R i ver L i g ht & Pow e r a n d W

Rose, Annkatrin

320

Biomass Potentials from California Forest and Shrublands Including Fuel  

E-Print Network [OSTI]

Biomass Potentials from California Forest and Shrublands Including Fuel Reduction Potentials-04-004 February 2005 Revised: October 2005 Arnold Schwarzenegger, Governor, State of California #12;Biomass Tiangco, CEC Bryan M. Jenkins, University of California #12;Biomass Potentials from California Forest

Note: This page contains sample records for the topic "arabia include approximately" 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

Project Management Business Process Project Delivery Processes Includes VE Budget  

E-Print Network [OSTI]

Project Management Business Process Project Delivery Processes Includes VE Budget Schedule Activities that do/could feed into PMBP LEGEND VE Cost Avoidance Program Coverage Document Results (Before, could use the value methodology to facilitate after action review. The project manager is responsible

US Army Corps of Engineers

322

DISTINCTIONS The unique combination of factors which distinguish Berea includes  

E-Print Network [OSTI]

throughout Appala- chia. SUSTAINABLE CAMPUS FEATURES The College environment demonstrates sustainable living and enhances student learning. Recently renovated historical buildings and residence halls include sustain, Washington Monthly ranked Berea the #1 liberal arts college in the nation Listed as a "Best Buy" college

Baltisberger, Jay H.

323

FORUMA Hamilton Spectator Town Hall Event SPEAKERS INCLUDE  

E-Print Network [OSTI]

R001990104 OPEN FORUMA Hamilton Spectator Town Hall Event SPEAKERS INCLUDE: STEVE BUIST, Spectator, former chairman of Hamilton-Wentworth region and now president and CEO of the Hamilton Community Foundation. DR. CHRIS MACKIE, Hamilton's associate medical officer of health. MARK CHAMBERLAIN, president

Thompson, Michael

324

ASTRO-F/FIS observing simulation including detector characteristics  

E-Print Network [OSTI]

ASTRO-F/FIS observing simulation including detector characteristics Woong-Seob Jeong a,*, Soojong instruments, the far-infrared surveyor (FIS) will map the entire sky in four bands using short wavelength (SW- oped a suite of software with an aim to simulate the FIS observations (Jeong et al., 2000, 2003, 2004

Pak, Soojong

325

ASTRO-F/FIS Observing Simulation Including Detector Characteristics  

E-Print Network [OSTI]

ASTRO-F/FIS Observing Simulation Including Detector Characteristics Woong-Seob Jeong1, Soojong Pak1 simulations to examined the detector characteristics on the FIS instrument (Far- Infrared Surveyor) images narrow and wide bands using a short wavelength (SW) and long wavelength (LW) detector array. The FIS (Far

Lee, Hyung Mok

326

cDNA encoding a polypeptide including a hevein sequence  

DOE Patents [OSTI]

A cDNA clone (HEV1) encoding hevein was isolated via polymerase chain reaction (PCR) using mixed oligonucleotides corresponding to two regions of hevein as primers and a Hevea brasiliensis latex cDNA library as a template. HEV1 is 1,018 nucleotides long and includes an open reading frame of 204 amino acids.

Raikhel, N.V.; Broekaert, W.F.; Namhai Chua; Kush, A.

1993-02-16T23:59:59.000Z

327

Methods of Purchasing Purchasing methods include the different  

E-Print Network [OSTI]

" purchases must be reviewed and approved by the Controller's Office. This may result in the end user beingMethods of Purchasing Purchasing methods include the different processes of ordering goods and/or services, and encumbering funds. #12;Method of Purchase Field Purchase Orders (FPO) Accepted

328

Stable Numerical Approximation of Two-Phase Flow with a Boussinesq--Scriven Surface Fluid  

E-Print Network [OSTI]

We consider two-phase Navier--Stokes flow with a Boussinesq--Scriven surface fluid. In such a fluid the rheological behaviour at the interface includes surface viscosity effects, in addition to the classical surface tension effects. We introduce and analyze parametric finite element approximations, and show, in particular, stability results for semi-discrete versions of the methods, by demonstrating that a free energy inequality also holds on the discrete level. We perform several numerical simulations for various scenarios in two and three dimensions, which illustrate the effects of the surface viscosity.

Barrett, John W; Nürnberg, Robert

2014-01-01T23:59:59.000Z

329

Optical transitions in semiconductor superlattices with zinc-blende structure in the k?p approximation  

Science Journals Connector (OSTI)

Transition-matrix elements for superlattices consisting of materials with the zinc-blende structure are presented in analytical form in the k?p approximation including the ?6, ?7, and ?8 bands. The resulting selection rules for cases where the magnetic field is absent, and where the magnetic field is applied perpendicular to the superlattice layers, are discussed. The results can be used for type-I, -II, and -III superlattices. They can also be used for other systems, such as a single quantum well.

H. Luo and J. K. Furdyna

1990-03-15T23:59:59.000Z

330

Simulated Stochastic Approximation Annealing for Global Optimization with a Square-Root Cooling Schedule  

SciTech Connect (OSTI)

Simulated annealing has been widely used in the solution of optimization problems. As known by many researchers, the global optima cannot be guaranteed to be located by simulated annealing unless a logarithmic cooling schedule is used. However, the logarithmic cooling schedule is so slow that no one can afford to have such a long CPU time. This paper proposes a new stochastic optimization algorithm, the so-called simulated stochastic approximation annealing algorithm, which is a combination of simulated annealing and the stochastic approximation Monte Carlo algorithm. Under the framework of stochastic approximation Markov chain Monte Carlo, it is shown that the new algorithm can work with a cooling schedule in which the temperature can decrease much faster than in the logarithmic cooling schedule, e.g., a square-root cooling schedule, while guaranteeing the global optima to be reached when the temperature tends to zero. The new algorithm has been tested on a few benchmark optimization problems, including feed-forward neural network training and protein-folding. The numerical results indicate that the new algorithm can significantly outperform simulated annealing and other competitors.

Liang, Faming; Cheng, Yichen; Lin, Guang

2014-06-13T23:59:59.000Z

331

Including radiative heat transfer and reaction quenching in modeling a Claus plant waste heat boiler  

SciTech Connect (OSTI)

Due to increasingly stringent sulfur emission regulations, improvements are necessary in the modified Claus process. A recently proposed model by Nasato et al. for the Claus plant waste heat boiler (WHB) is improved by including radiative heat transfer, which yields significant changes in the predicted heat flux and the temperature profile along the WHB tube, leading to a faster quenching of chemical reactions. For the WHB considered, radiation accounts for approximately 20% of the heat transferred by convection alone. More importantly, operating the WHB at a higher gas mass flux is shown to enhance reaction quenching, resulting in a doubling of the predicted hydrogen flow rate. This increase in hydrogen flow rate is sufficient to completely meet the hydrogen requirement of the H[sub 2]S recovery process considered, which would eliminate the need for a hydrogen plant.

Karan, K.; Mehrotra, A.K.; Behie, L.A. (Univ. of Calgary, Alberta (Canada). Dept. of Chemical and Petroleum Engineering)

1994-11-01T23:59:59.000Z

332

Ionization potential of {sup 9}Be calculated including nuclear motion and relativistic corrections  

SciTech Connect (OSTI)

Variational calculations employing explicitly correlated Gaussian functions have been performed for the ground states of {sup 9}Be and {sup 9}Be{sup +} including the nuclear motion [i.e., without assuming the Born-Oppenheimer (BO) approximation]. An approach based on the analytical energy gradient calculated with respect to the Gaussian exponential parameters was employed, leading to energies of the two systems noticeably improved over those found in the recent paper of Pachucki and Komasa [Phys. Rev. A 73, 052502 (2006)]. The non-BO wave functions were used to calculate the {alpha}{sup 2} relativistic corrections ({alpha}=e{sup 2}/({Dirac_h}/2{pi})c). With those corrections and the {alpha}{sup 3} and {alpha}{sup 4} corrections taken from Pachucki and Komasa, a new value of the ionization potential (IP) of {sup 9}Be was determined. It agrees very well with the most recent experimental IP.

Stanke, Monika [Department of Chemistry, University of Arizona, Tucson, Arizona 85721 (United States); Institute of Physics, Nicholas Copernicus University, ulica Grudziadzka 5, PL 87-100 Torun (Poland); Kedziera, Dariusz [Department of Chemistry, Nicholas Copernicus University, ulica Gagarina 7, PL 87-100 Torun (Poland); Bubin, Sergiy [Department of Chemistry, University of Arizona, Tucson, Arizona 85721 (United States); Adamowicz, Ludwik [Department of Chemistry, University of Arizona, Tucson, Arizona 85721 (United States); Department of Physics, University of Arizona, Tucson, Arizona 85721 (United States)

2007-05-15T23:59:59.000Z

333

Non-Born-Oppenheimer calculations of the lowest vibrational energy of HD including relativistic corrections  

Science Journals Connector (OSTI)

In this work we report variational calculations of the two lowest vibrational states of the HD molecule within the framework that does not assume the Born-Oppenheimer (BO) approximation. The nonrelativistic energies of the states were corrected for the relativistic effects of the order of ?2 (where ?=1c), calculated as expectation values of the operators representing these effects with the nonrelativistic non-BO wave functions. The non-BO wave functions were expanded in terms of the one-center explicitly correlated Gaussian functions multiplied by even powers of the internuclear distance. The v=0?1 transition energy obtained in the calculations is compared with the previous calculations, as well as with the transition frequency obtained from the experimental spectra. The comparison shows the need to include corrections higher than second order in ? to further improve the agreement between the theory and the experiment.

Monika Stanke; Sergiy Bubin; Marcin Molski; Ludwik Adamowicz

2009-03-16T23:59:59.000Z

334

Approximations to Brueckner theory for nucleon-nucleus collisions  

Science Journals Connector (OSTI)

The concept of quasiparticles has been very fruitful for the development of theories of many-body systems of strongly interacting particles. A central problem for a quantitative treatment is the interaction between the quasiparticles (the effective interaction between particles). The Brueckner reaction matrix theory and the Jastrow variational approach have been used extensively, especially for nuclei. Our present concern is the collisions between nuclei. An exact calculation of the effective interaction between the nucleons is then extremely complicated. Only the simplest extreme, the nucleon-nucleus optical potential, can be treated fully. Approximate treatments are called for. The present paper investigates some approximations to the Brueckner theory. We are primarily interested in the imaginary part of the one-body (one-nucleon) mean field, as it relates to the damping of collective motion. Of special interest is the increase at low density. Comparisons with Skyrme forces show that they exaggerate this density dependence.

H.S. Köhler

1984-01-01T23:59:59.000Z

335

Exploring approximations to the GW self-energy ionic gradients  

E-Print Network [OSTI]

The accuracy of the many-body perturbation theory GW formalism to calculate electron-phonon coupling matrix elements has been recently demonstrated in the case of a few important systems. However, the related computational costs are high and thus represent strong limitations to its widespread application. In the present study, we explore two less demanding alternatives for the calculation of electron-phonon coupling matrix elements on the many-body perturbation theory level. Namely, we test the accuracy of the static Coulomb-hole plus screened-exchange (COHSEX) approximation and further of the constant screening approach, where variations of the screened Coulomb potential W upon small changes of the atomic positions along the vibrational eigenmodes are neglected. We find this latter approximation to be the most reliable, whereas the static COHSEX ansatz leads to substantial errors. Our conclusions are validated in a few paradigmatic cases: diamond, graphene and the C60 fullerene. These findings open the way f...

Faber, C; Attaccalite, C; Cannuccia, E; Duchemin, I; Deutsch, T; Blase, X

2015-01-01T23:59:59.000Z

336

Studies in Interpolation and Approximation of Multivariate Bandlimited Functions  

E-Print Network [OSTI]

&M University in partial ful llment of the requirements for the degree of DOCTOR OF PHILOSOPHY Approved by: Co-Chairs of Committee, Thomas Schlumprecht N. Sivakumar Committee Members, Joel Zinn William Johnson Fred Dahm Head of Department, Albert...{Chairs of Advisory Committee: Dr. Thomas Schlumprecht Dr. N. Sivakumar The focus of this dissertation is the interpolation and approximation of multi- variate bandlimited functions via sampled (function) values. The rst set of results investigates polynomial...

Bailey, Benjamin Aaron

2012-10-19T23:59:59.000Z

337

A randomised approximation algorithm for the hitting set problem  

Science Journals Connector (OSTI)

Abstract Let H = ( V , E ) be a hypergraph with vertex set V and edge set E , where n : = | V | and m : = | E | . Let l be the maximum size of an edge and ? be the maximum vertex degree. A hitting set (or vertex cover) in H is a subset of V in which all edges are incident. The hitting set problem is to find a hitting set of minimum cardinality. It is known that an approximation ratio of l can be achieved easily. On the other hand, for constant l, an approximation ratio better than l cannot be achieved in polynomial time under the unique games conjecture (Khot and Regev, 2008 [17]). Thus breaking the l-barrier for significant classes of hypergraphs is a complexity-theoretically and algorithmically interesting problem, which has been studied by several authors (Krivelevich, 1997 [18], Halperin, 2000 [12], Okun, 2005 [23]). We propose a randomised algorithm of hybrid type for the hitting set problem, which combines LP-based randomised rounding, graphs sparsening and greedy repairing and analyse it for different classes of hypergraphs. For hypergraphs with ? = O ( n 1 4 ) and l = O ( n ) we achieve an approximation ratio of l ( 1 ? c ? ) , for some constant c > 0 , with constant probability. For the case of hypergraphs where l and ? are constants, we prove a ratio of l ( 1 ? l ? 1 8 ? ) . The latter is done by analysing the expected size of the hitting set and using concentration inequalities. Moreover, for quasi-regularisable hypergraphs, we achieve an approximation ratio of l ( 1 ? n 8 m ) . We show how and when our results improve over the results of Krivelevich, Halperin and Okun.

Mourad El Ouali; Helena Fohlin; Anand Srivastav

2014-01-01T23:59:59.000Z

338

Crystallization of polyethylene by modified weighted density approximation(MWDA)  

E-Print Network [OSTI]

In this article, we use the modified weighted density approximation to study the crystallization of polyethylene. We also use a direct correlation function of polyethylene based on RISM theory. The free energy of a polyethylene is calculated using density functional theory. The crystallization and solid and liquid density are calculated and finally compared with the prism simulation and experimental results. That shown the result obtained by MWDA is in better agreement, compared with the experimental result than the prism.

Razeghizadeh, Alireza; Lavafpour, Farhad

2015-01-01T23:59:59.000Z

339

Crystallization of polyethylene by modified weighted density approximation(MWDA)  

E-Print Network [OSTI]

In this article, we use the modified weighted density approximation to study the crystallization of polyethylene. We also use a direct correlation function of polyethylene based on RISM theory. The free energy of a polyethylene is calculated using density functional theory. The crystallization and solid and liquid density are calculated and finally compared with the prism simulation and experimental results. That shown the result obtained by MWDA is in better agreement, compared with the experimental result than the prism.

Alireza Razeghizadeh; Vahdat Rafee; Farhad Lavafpour

2015-02-07T23:59:59.000Z

340

Topologies and approximation operators induced by binary relations  

E-Print Network [OSTI]

Rough set theory is an important mathematical tool for dealing with uncertain or vague information. This paper studies some new topologies induced by a binary relation on universe with respect to neighborhood opera- tors. Moreover, the relations among them are studied. In additionally, lower and upper approximations of rough sets using the binary relation with respect to neighborhood operators are studied and examples are given.

Nurettin Bagirmaz; A. Fatih Ozcan Hatice Tasbozan; Ilhan Icen

2014-05-09T23:59:59.000Z

Note: This page contains sample records for the topic "arabia include approximately" 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

Product-state Approximations to Quantum Ground States  

E-Print Network [OSTI]

The local Hamiltonian problem consists of estimating the ground-state energy (given by the minimum eigenvalue) of a local quantum Hamiltonian. First, we show the existence of a good product-state approximation for the ground-state energy of 2-local Hamiltonians with one or more of the following properties: (1) high degree, (2) small expansion, or (3) a ground state with sublinear entanglement with respect to some partition into small pieces. The approximation based on degree is a surprising difference between quantum Hamiltonians and classical CSPs (constraint satisfaction problems), since in the classical setting, higher degree is usually associated with harder CSPs. The approximation based on low entanglement, in turn, was previously known only in the regime where the entanglement was close to zero. Since the existence of a low-energy product state can be checked in NP, the result implies that any Hamiltonian used for a quantum PCP theorem should have: (1) constant degree, (2) constant expansion, (3) a "volume law" for entanglement with respect to any partition into small parts. Second, we show that in several cases, good product-state approximations not only exist, but can be found in polynomial time: (1) 2-local Hamiltonians on any planar graph, solving an open problem of Bansal, Bravyi, and Terhal, (2) dense k-local Hamiltonians for any constant k, solving an open problem of Gharibian and Kempe, and (3) 2-local Hamiltonians on graphs with low threshold rank, via a quantum generalization of a recent result of Barak, Raghavendra and Steurer. Our work introduces two new tools which may be of independent interest. First, we prove a new quantum version of the de Finetti theorem which does not require the usual assumption of symmetry. Second, we describe a way to analyze the application of the Lasserre/Parrilo SDP hierarchy to local quantum Hamiltonians.

Fernando G. S. L. Brandão; Aram W. Harrow

2014-12-15T23:59:59.000Z

342

The Local Potential Approximation for the Brueckner G-matrix  

E-Print Network [OSTI]

The Brueckner G-matrix for a slab of nuclear matter is analyzed in the singlet $^1S$ and triplet $^3S+^3D$ channels. The complete Hilbert space is split into two domains, the model subspace $S_0$, in which the two-particle propagator is calculated explicitly, and the complementary one, $S'$, in which the local potential approximation is used. This kind of local approximation was previously found to be quite accurate for the $^1S$ pairing problem. A set of model spaces $S_0(E_0)$ with different values of the cut-off energy $E_0$ is considered, $E_0$ being the upper limit for the single-particle energies of the states belonging to $S_0$. The independence of the G-matrix of $E_0$ is assumed as a criterion of validity of the local potential approximation. Such independence is obtained within few percent for $E_0=10 \\div 20$ MeV for both the channels under consideration.

M. Baldo; U. Lombardo; E. E. Saperstein; M. V. Zverev

2001-04-16T23:59:59.000Z

343

Nonlocal independent pixel approximation: Direct and inverse problems  

SciTech Connect (OSTI)

The independent pixel approximation (IPA), which treats radiative properties of each pixel independently by using standard plane-parallel calculations preserves scale-invariance found in the analyses of the horizontal variability of liquid water in marine stratocumulus clouds. Several studies, however, report a violation of scale-invariance in LANDSAT cloud radiance fields that are much smoother than cloud structure on small scales. This shows a limitation of IPA on small scales: it is unable to simulate the smooth small-scale behavior that is due to the horizontal photon transport. This paper introduces a nonlocal independent pixel approximation (NIPA) that extends the IPA by incorporating empirically the smoothing effects of horizontal interpixel fluxes through a convolution product of the IPA and an approximate Green function for radiative transfer. The authors also address the inverse problem of cloud optical depth retrieval from satellite data, showing how NIPA can be used to overcome the limitations of current IPA-based methods at small scales.

Marshak, A. [NASA Goddard Space Flight Center, Greenbelt, MD (United States). Climate and Radiation Branch] [NASA Goddard Space Flight Center, Greenbelt, MD (United States). Climate and Radiation Branch; [Univ. of Maryland Baltimore County, Baltimore, MD (United States). Joint Center for Earth Systems Technology; Davis, A. [NASA Goddard Space Flight Center, Greenbelt, MD (United States). Climate and Radiation Branch] [NASA Goddard Space Flight Center, Greenbelt, MD (United States). Climate and Radiation Branch; [Science Systems and Applications, Inc., Lanham, MD (United States); Cahalan, R.F.; Wiscombe, W. [NASA Goddard Space Flight Center, Greenbelt, MD (United States). Climate and Radiation Branch] [NASA Goddard Space Flight Center, Greenbelt, MD (United States). Climate and Radiation Branch

1998-01-01T23:59:59.000Z

344

DOE Considers Natural Gas Utility Service Options: Proposal Includes  

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

Considers Natural Gas Utility Service Options: Proposal Considers Natural Gas Utility Service Options: Proposal Includes 30-mile Natural Gas Pipeline from Pasco to Hanford DOE Considers Natural Gas Utility Service Options: Proposal Includes 30-mile Natural Gas Pipeline from Pasco to Hanford January 23, 2012 - 12:00pm Addthis Media Contacts Cameron Hardy, DOE , (509) 376-5365, Cameron.Hardy@rl.doe.gov RICHLAND, WASH. - The U.S. Department of Energy (DOE) is considering natural gas transportation and distribution requirements to support the Waste Treatment Plant (WTP) and evaporator operations at the Hanford Site in southeastern Washington State. DOE awarded a task order worth up to $5 million to the local, licensed supplier of natural gas in the Hanford area, Cascade Natural Gas Corporation (Cascade). Cascade will support DOE and its Environmental

345

Italy (including San Marino) Fossil-Fuel CO2 Emissions  

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

Western Europe » Italy Western Europe » Italy (including San Marino) Italy (including San Marino) Fossil-Fuel CO2 Emissions Graph graphic Graphics Data graphic Data Trends As occurred in many industrialized nations, CO2 emissions from Italy rose steeply since the late 1940's until the growth was abruptly terminated in 1974. Since 1974, emissions from liquid fuels have vacillated, dropping from 76% to 46% of a static but varying total. Significant increases in natural gas consumption have compensated for the drop in oil consumption. In 2008, 35.8% of Italy's fossil-fuel CO2 emissions were due to natural gas consumption. Coal usage grew steadily until 1985 when CO2 emissions from coal consumption reached 16 million metric tons of carbon. Not until 2004 did coal usage exceed 1985 levels and now accounts for 13.9% of Italy's

346

Multi-processor including data flow accelerator module  

DOE Patents [OSTI]

An accelerator module for a data flow computer includes an intelligent memory. The module is added to a multiprocessor arrangement and uses a shared tagged memory architecture in the data flow computer. The intelligent memory module assigns locations for holding data values in correspondence with arcs leading to a node in a data dependency graph. Each primitive computation is associated with a corresponding memory cell, including a number of slots for operands needed to execute a primitive computation, a primitive identifying pointer, and linking slots for distributing the result of the cell computation to other cells requiring that result as an operand. Circuitry is provided for utilizing tag bits to determine automatically when all operands required by a processor are available and for scheduling the primitive for execution in a queue. Each memory cell of the module may be associated with any of the primitives, and the particular primitive to be executed by the processor associated with the cell is identified by providing an index, such as the cell number for the primitive, to the primitive lookup table of starting addresses. The module thus serves to perform functions previously performed by a number of sections of data flow architectures and coexists with conventional shared memory therein. A multiprocessing system including the module operates in a hybrid mode, wherein the same processing modules are used to perform some processing in a sequential mode, under immediate control of an operating system, while performing other processing in a data flow mode.

Davidson, George S. (Albuquerque, NM); Pierce, Paul E. (Albuquerque, NM)

1990-01-01T23:59:59.000Z

347

Exact and approximate differential renormalization-group generators  

Science Journals Connector (OSTI)

In dealing with critical phenomena of complex systems that simulate realistic materials, the full structure of the renormalization group is often unnecessarily cumbersome. For approximate calculations and for systems with special properties, specialized generators are simpler to apply. We derive several such exact and approximate differential generators and solve a number of interesting practical problems to illustrate this approach: (i) We derive a new approximate differential generator based on the Wilson incomplete-integration generator. Using this generator we calculate for an n-component spin system the eigenvalues (critical-point exponents) associated with a critical point of arbitrary order O and "propagator exponent" ?? to first order in the expansion parameter ?O(??)=d+O(??-d); this extends previous work for ??=2, O arbitrary; ???2, O=2 (long-rang forces); and ??=4, O=2 (the "Lifshitz point"). Our results agree with those obtainable using an approximate generator based on the Wegner-Houghton equation. The cases ??=2L (L a positive integer ?2) describe the onset of helical ordering for which | k?|?(-p)?k, where ?k=12(L-1)+o(?O2(2L)) and p parametrizes the hypersurface of critical points. For p>0, the ordered phase is uniform; for p<0 there is spiral order. The point p=0, at which such nonuniform ordering commences, we term a generalized Lifshitz point of Lifschitz character L. (ii) We consider the full Wilson and Wegner-Houghton generators in the paired spin-momenta limit and the n?? limit for even-order critical points. These limiting generators are identical for both full generators. This demonstrates that at least in these cases the Wilson and Wegner-Houghton generators agree exactly, without recourse to perturbation theory. These simple exact generators should provide "anchors" for calculations of exponents for higher-order critical points. (iii) We derive approximate generators which are suitable for compressible magnetic systems and more general systems with constraints for which the spin momenta are grouped in any arbitrary manner. We apply this to the case of a simple compressible magnet model and obtain the exact renormalization-group trajectories to order ? with ???2(2)=4-d.

J. F. Nicoll; T. S. Chang; H. E. Stanley

1976-03-01T23:59:59.000Z

348

E-Print Network 3.0 - approximate solution method Sample Search...  

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

numerical solution of partial differential... , Meshfree Approximation Methods with Matlab, Lecture Notes, IIT, 2005. Other required material... data approximation with radial...

349

S-truncated Functions and Rough Sets in Approximation and Classification of Bottleneck Polygons.  

E-Print Network [OSTI]

??Some collections of two-dimensional points form very irregular shapes, which cannot be approximated by standard curves without making large errors. We approximate the sets of… (more)

Rakus-Andersson, Elisabeth

2005-01-01T23:59:59.000Z

350

Variational Fermi–hypernetted-chain approximation [FHNC/?(r)] calculations with ?z-dependent correlations in liquid He3  

Science Journals Connector (OSTI)

The ground state of liquid He3 at zero temperature is approximated by a Jastrow two-body trial wave function including ?z-dependent correlations. The variational calculations are performed in the framework of the Fermi-hypernetted-chain (FHNC) approximation, and the elementary diagrams are estimated with two different extensions of the interpolating equation approach [FHNC/?(r)] [Fabrocini and Rosati, Nuovo Cimento D 1, 615 (1982)]. A comparison with a variational Monte Carlo calculation [Kürten and Clark, Phys. Rev. B 30, 1342 (1984)] shows good agreement for the expectation values of the total, kinetic, and potential energies. The increase of the total energy over a ?z-independent calculation, working with a semioptimized correlation function, is approximately 0.2 K at the equilibrium density for both Lennard-Jones and Aziz HFDHE2 potentials.

F. Arias de Saavedra and E. Buendría

1990-10-01T23:59:59.000Z

351

United States/Mexico electricity trade study. [Glossary included  

SciTech Connect (OSTI)

During energy discussions between the United States and Mexico, it was suggested that the two countries revisit the issue of enhanced electricity trade because 10 years had elapsed since this issue was first studied. Responsibility to organize the updated study was jointly assigned to the US and to the Comision Federal de Electricidad (CFE). The study highlights the opportunities for increased cooperation among the electric utilities in the U.S. and Mexico. Direct benefits could include increased reliability of electric power service and cost savings through diversity of peak demand patterns and locational benefits associated with the siting of new generation sources. Indirect benefits could include improved economic and employment opportunities, especially in the border areas of both countries. While the study indicates that increased electricity trade is possible, there are significant technical and economic issues to consider. Any major increase in electricity trade would require a higher level of cooperation and coordination among utilities in both countries and would need to be preceded by a detailed analysis of associated benefits and costs (including environmental impacts) on both a short-term and a long-term basis. Whether US utilities and CFE decide to pursue specific projects will depend upon the need for and economics of those projects. The study recommends that the work begun by the two utility groups be continued. The study also recommends that regulators at all levels consider policies to increase coordination and review among all relevant parties so that unnecessary delays in planning and constructing needed facilities are avoided. 12 figs., 17 tabs.

Not Available

1991-03-01T23:59:59.000Z

352

Dielectric function beyond the random-phase approximation: Kinetic theory versus linear response theory  

Science Journals Connector (OSTI)

Calculating the frequency-dependent dielectric function for strongly coupled plasmas, the relations within kinetic theory and linear response theory are derived and discussed in comparison. In this context, we give a proof that the Kohler variational principle can be extended to arbitrary frequencies. It is shown to be a special case of the Zubarev method for the construction of a nonequilibrium statistical operator from the principle of the extremum of entropy production. Within kinetic theory, the commonly used energy-dependent relaxation time approach is strictly valid only for the Lorentz plasma in the static case. It is compared with the result from linear response theory that includes electron-electron interactions and applies for arbitrary frequencies, including bremsstrahlung emission. It is shown how a general approach to linear response encompasses the different approximations and opens options for systematic improvements.

H. Reinholz and G. Röpke

2012-03-08T23:59:59.000Z

353

Information regarding previous INCITE awards including selected highlights  

Office of Science (SC) Website

Information regarding previous INCITE awards including selected highlights Advanced Scientific Computing Research (ASCR) ASCR Home About Research Facilities Accessing ASCR Supercomputers Oak Ridge Leadership Computing Facility (OLCF) Argonne Leadership Computing Facility (ALCF) National Energy Research Scientific Computing Center (NERSC) Energy Sciences Network (ESnet) Research & Evaluation Prototypes (REP) Innovative & Novel Computational Impact on Theory and Experiment (INCITE) ASCR Leadership Computing Challenge (ALCC) Science Highlights Benefits of ASCR Funding Opportunities Advanced Scientific Computing Advisory Committee (ASCAC) News & Resources Contact Information Advanced Scientific Computing Research U.S. Department of Energy SC-21/Germantown Building

354

Composite armor, armor system and vehicle including armor system  

DOE Patents [OSTI]

Composite armor panels are disclosed. Each panel comprises a plurality of functional layers comprising at least an outermost layer, an intermediate layer and a base layer. An armor system incorporating armor panels is also disclosed. Armor panels are mounted on carriages movably secured to adjacent rails of a rail system. Each panel may be moved on its associated rail and into partially overlapping relationship with another panel on an adjacent rail for protection against incoming ordnance from various directions. The rail system may be configured as at least a part of a ring, and be disposed about a hatch on a vehicle. Vehicles including an armor system are also disclosed.

Chu, Henry S.; Jones, Warren F.; Lacy, Jeffrey M.; Thinnes, Gary L.

2013-01-01T23:59:59.000Z

355

cDNA encoding a polypeptide including a hevein sequence  

DOE Patents [OSTI]

A cDNA clone (HEV1) encoding hevein was isolated via polymerase chain reaction (PCR) using mixed oligonucleotides corresponding to two regions of hevein as primers and a Hevea brasiliensis latex cDNA library as a template. HEV1 is 1018 nucleotides long and includes an open reading frame of 204 amino acids. The deduced amino acid sequence contains a pu GOVERNMENT RIGHTS This application was funded under Department of Energy Contract DE-AC02-76ER01338. The U.S. Government has certain rights under this application and any patent issuing thereon.

Raikhel, Natasha V. (Okemos, MI); Broekaert, Willem F. (Dilbeek, BE); Chua, Nam-Hai (Scarsdale, NY); Kush, Anil (New York, NY)

1993-02-16T23:59:59.000Z

356

Reliability modeling of transmission and distribution systems including dependent failures  

E-Print Network [OSTI]

is considered. Therefore, the trans i t ion rate mat r i x of the entire system need not be generated. Th i s method is compared wi th the sequential method for normal and stormy weather condit ions, and is then extended to include m weather conditions... . 9 E . Cut -Set Equations 10 III M A R K O V C U T - S E T M E T H O D 13 A . Basic Approach 13 B . Markov Cut -Set Me thod 13 C . Examp le 18 D . Compar ison wi th the Sequential Me thod 22 E . Cut-Sets w i th m Weather States 24 F . Extens...

Beydoun, Rami Sami

2012-06-07T23:59:59.000Z

357

Moduli-space approximation for BPS brane worlds  

Science Journals Connector (OSTI)

We develop the moduli-space approximation for the low energy regime of Bogomolnyi-Prasad-Sommerfield (BPS) branes with a bulk scalar field to obtain an effective four-dimensional action describing the system. An arbitrary BPS potential is used and account is taken of the presence of matter in the branes and small supersymmetry breaking terms. The resulting effective theory is a bi-scalar tensor theory of gravity. In this theory, the scalar degrees of freedom can be stabilized naturally without the introduction of additional mechanisms other than the appropriate BPS potential. We place observational constraints on the shape of the potential and the global configuration of branes.

Gonzalo A. Palma and Anne-Christine Davis

2004-11-11T23:59:59.000Z

358

Breakdown of the Dipole Approximation in Strong-Field Ionization  

E-Print Network [OSTI]

We report the breakdown of the electric dipole approximation in the long-wavelength limit in strong-field ionization with linearly polarized few-cycle mid-infrared laser pulses at intensities on the order of 10$^{13}$ W/cm$^2$. Photoelectron momentum distributions were recorded by velocity map imaging and projected onto the beam propagation axis. We observe an increasing shift of the peak of this projection opposite to the beam propagation direction with increasing laser intensities. From a comparison with semi-classical simulations, we identify the combined action of the magnetic field of the laser pulse and the Coulomb potential as origin of our observations.

Ludwig, A; Mayer, B W; Phillips, C R; Gallmann, L; Keller, U

2014-01-01T23:59:59.000Z

359

Breakdown of the Dipole Approximation in Strong-Field Ionization  

E-Print Network [OSTI]

We report the breakdown of the electric dipole approximation in the long-wavelength limit in strong-field ionization with linearly polarized few-cycle mid-infrared laser pulses at intensities on the order of 10$^{13}$ W/cm$^2$. Photoelectron momentum distributions were recorded by velocity map imaging and projected onto the beam propagation axis. We observe an increasing shift of the peak of this projection opposite to the beam propagation direction with increasing laser intensities. From a comparison with semi-classical simulations, we identify the combined action of the magnetic field of the laser pulse and the Coulomb potential as origin of our observations.

A. Ludwig; J. Maurer; B. W. Mayer; C. R. Phillips; L. Gallmann; U. Keller

2014-08-11T23:59:59.000Z

360

[Article 1 of 7: Motivates and Includes the Consumer]  

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

2 of 7: Research on the Characteristics of a Modern Grid by the NETL 2 of 7: Research on the Characteristics of a Modern Grid by the NETL Modern Grid Strategy Team Accommodates All Generation and Storage Options Last month we presented the first Principal Characteristic of a Modern Grid, "Motivates and Includes the Consumer". This month we present a second characteristic, "Accommodates All Generation and Storage Options". This characteristic will fundamentally transition today's grid from a centralized model for generation to one that also has a more balanced contribution from decentralized generation and storage. This characteristic, along with the other six, define a Modern Grid that will power the 21 st Century economy. For a more detailed discussion on "Accommodates All Generation and Storage Options", please see:

Note: This page contains sample records for the topic "arabia include approximately" 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

Search for Earth-like planets includes LANL star analysis  

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

Search for earth-like planets Search for earth-like planets Search for Earth-like planets includes LANL star analysis The mission will not only be able to search for planets around other stars, but also yield new insights into the parent stars themselves. March 6, 2009 Los Alamos National Laboratory sits on top of a once-remote mesa in northern New Mexico with the Jemez mountains as a backdrop to research and innovation covering multi-disciplines from bioscience, sustainable energy sources, to plasma physics and new materials. Los Alamos National Laboratory sits on top of a once-remote mesa in northern New Mexico with the Jemez mountains as a backdrop to research and innovation covering multi-disciplines from bioscience, sustainable energy sources, to plasma physics and new materials.

362

Notices ROUTINE USES OF RECORDS MAINTAINED IN THE SYSTEM, INCLUDING  

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

83 Federal Register 83 Federal Register / Vol. 78, No. 51 / Friday, March 15, 2013 / Notices ROUTINE USES OF RECORDS MAINTAINED IN THE SYSTEM, INCLUDING CATEGORIES OF USERS AND THE PURPOSES OF SUCH USES: The Department may disclose information contained in a record in this system of records under the routine uses listed in this system of records without the consent of the individual if the disclosure is compatible with the purposes for which the record was collected. These disclosures may be made on a case-by-case basis or, if the Department has complied with the computer matching requirements of the Privacy Act of 1974, as amended (Privacy Act), under a computer matching agreement. Any disclosure of individually identifiable information from a record in this system must also comply with the requirements of section

363

Including stereoscopic information in the reconstruction of coronal magnetic fields  

E-Print Network [OSTI]

We present a method to include stereoscopic information about the three dimensional structure of flux tubes into the reconstruction of the coronal magnetic field. Due to the low plasma beta in the corona we can assume a force free magnetic field, with the current density parallel to the magnetic field lines. Here we use linear force free fields for simplicity. The method uses the line of sight magnetic field on the photosphere as observational input. The value of $\\alpha$ is determined iteratively by comparing the reconstructed magnetic field with the observed structures. The final configuration is the optimal linear force solution constrained by both the photospheric magnetogram and the observed plasma structures. As an example we apply our method to SOHO MDI/EIT data of an active region. In the future it is planned to apply the method to analyse data from the SECCHI instrument aboard the STEREO mission.

T. Wiegelmann; T. Neukirch

2008-01-23T23:59:59.000Z

364

Electra-optical device including a nitrogen containing electrolyte  

DOE Patents [OSTI]

Described is a thin-film battery, especially a thin-film microbattery, and a method for making same having application as a backup or primary integrated power source for electronic devices. The battery includes a novel electrolyte which is electrochemically stable and does not react with the lithium anode and a novel vanadium oxide cathode Configured as a microbattery, the battery can be fabricated directly onto a semiconductor chip, onto the semiconductor die or onto any portion of the chip carrier. The battery can be fabricated to any specified size or shape to meet the requirements of a particular application. The battery is fabricated of solid state materials and is capable of operation between -15.degree. C. and 150.degree. C.

Bates, John B. (Oak Ridge, TN); Dudney, Nancy J. (Knoxville, TN); Gruzalski, Greg R. (Oak Ridge, TN); Luck, Christopher F. (Knoxville, TN)

1995-01-01T23:59:59.000Z

365

Copper laser modulator driving assembly including a magnetic compression laser  

DOE Patents [OSTI]

A laser modulator (10) having a low voltage assembly (12) with a plurality of low voltage modules (14) with first stage magnetic compression circuits (20) and magnetic assist inductors (28) with a common core (91), such that timing of the first stage magnetic switches (30b) is thereby synchronized. A bipolar second stage of magnetic compression (42) is coupled to the low voltage modules (14) through a bipolar pulse transformer (36) and a third stage of magnetic compression (44) is directly coupled to the second stage of magnetic compression (42). The low voltage assembly (12) includes pressurized boxes (117) for improving voltage standoff between the primary winding assemblies (34) and secondary winding (40) contained therein.

Cook, Edward G. (Livermore, CA); Birx, Daniel L. (Oakley, CA); Ball, Don G. (Livermore, CA)

1994-01-01T23:59:59.000Z

366

Fuel cell repeater unit including frame and separator plate  

DOE Patents [OSTI]

An example fuel cell repeater includes a separator plate and a frame establishing at least a portion of a flow path that is operative to communicate fuel to or from at least one fuel cell held by the frame relative to the separator plate. The flow path has a perimeter and any fuel within the perimeter flow across the at least one fuel cell in a first direction. The separator plate, the frame, or both establish at least one conduit positioned outside the flow path perimeter. The conduit is outside of the flow path perimeter and is configured to direct flow in a second, different direction. The conduit is fluidly coupled with the flow path.

Yamanis, Jean; Hawkes, Justin R; Chiapetta, Jr., Louis; Bird, Connie E; Sun, Ellen Y; Croteau, Paul F

2013-11-05T23:59:59.000Z

367

THERMOHALINE INSTABILITIES INSIDE STARS: A SYNTHETIC STUDY INCLUDING EXTERNAL TURBULENCE AND RADIATIVE LEVITATION  

SciTech Connect (OSTI)

We have derived a new expression for the thermohaline mixing coefficient in stars, including the effects of radiative levitation and external turbulence, by solving Boussinesq equations in a nearly incompressible stratified fluid with a linear approximation. It is well known that radiative levitation of individual elements can lead to their accumulation in specific stellar layers. In some cases, it can induce important effects on the stellar structure. Here we confirm that this accumulation is moderated by thermohaline convection due to the resulting inverse {mu}-gradient. The new coefficient that we have derived shows that the effect of radiative accelerations on the thermohaline instability itself is small. This effect must however be checked in all computations. We also confirm that the presence of large horizontal turbulence can reduce or even suppress the thermohaline convection. These results are important as they concern all the cases of heavy element accumulation in stars. Computations of radiative diffusion must be revisited to include thermohaline convection and its consequences. It may be one of the basic reasons for the fact that the observed abundances are always smaller than those predicted by pure atomic diffusion. In any case, these processes have to compete with rotation-induced mixing, but this competition is more complex than previously thought due to their mutual interaction.

Vauclair, Sylvie; Theado, Sylvie, E-mail: sylvie.vauclair@irap.omp.eu [Universite de Toulouse, UPS-OMP and CNRS, Institut de Recherche en Astrophysique et Planetologie, 14 avenue Edouard Belin, F-31400 Toulouse (France)

2012-07-01T23:59:59.000Z

368

Boussinesq approximation of the Cahn-Hilliard-Navier-Stokes equations  

Science Journals Connector (OSTI)

We use the Cahn-Hilliard approach to model the slow dissolution dynamics of binary mixtures. An important peculiarity of the Cahn-Hilliard-Navier-Stokes equations is the necessity to use the full continuity equation even for a binary mixture of two incompressible liquids due to dependence of mixture density on concentration. The quasicompressibility of the governing equations brings a short time-scale (quasiacoustic) process that may not affect the slow dynamics but may significantly complicate the numerical treatment. Using the multiple-scale method we separate the physical processes occurring on different time scales and, ultimately, derive the equations with the filtered-out quasiacoustics. The derived equations represent the Boussinesq approximation of the Cahn-Hilliard-Navier-Stokes equations. This approximation can be further employed as a universal theoretical model for an analysis of slow thermodynamic and hydrodynamic evolution of the multiphase systems with strongly evolving and diffusing interfacial boundaries, i.e., for the processes involving dissolution/nucleation, evaporation/condensation, solidification/melting, polymerization, etc.

Anatoliy Vorobev

2010-11-12T23:59:59.000Z

369

Approximation algorithms for the partition vertex cover problem  

Science Journals Connector (OSTI)

Abstract We consider a natural generalization of the Partial Vertex Cover problem. Here an instance consists of a graph G = ( V , E ) , a cost function c : V ? Z + , a partition P 1 , … , P r of the edge set E, and a parameter k i for each partition P i . The objective is to find a minimum cost set of vertices which cover at least k i edges from the partition P i . We call this the Partition-VC problem. In this paper, we give matching upper and lower bound on the approximability of this problem. Our algorithm is based on a novel LP relaxation for this problem. This LP relaxation is obtained by adding knapsack cover inequalities to a natural LP relaxation of the problem. We show that this LP has integrality gap of O ( log ? r ) , where r is the number of sets in the partition of the edge set. We also extend our result to more general settings. For example we consider a problem where additionally edges have profits, and we would like to pick a minimum cost set of vertices which cover edges of total profit at least ? i for each partition P i . We call this the Knapsack Partition Vertex Cover problem. We give an O ( log ? r ) approximation algorithm for this problem as well.

Suman K. Bera; Shalmoli Gupta; Amit Kumar; Sambuddha Roy

2014-01-01T23:59:59.000Z

370

Communication: Random phase approximation renormalized many-body perturbation theory  

SciTech Connect (OSTI)

We derive a renormalized many-body perturbation theory (MBPT) starting from the random phase approximation (RPA). This RPA-renormalized perturbation theory extends the scope of single-reference MBPT methods to small-gap systems without significantly increasing the computational cost. The leading correction to RPA, termed the approximate exchange kernel (AXK), substantially improves upon RPA atomization energies and ionization potentials without affecting other properties such as barrier heights where RPA is already accurate. Thus, AXK is more balanced than second-order screened exchange [A. Grüneis et al., J. Chem. Phys. 131, 154115 (2009)], which tends to overcorrect RPA for systems with stronger static correlation. Similarly, AXK avoids the divergence of second-order Møller-Plesset (MP2) theory for small gap systems and delivers a much more consistent performance than MP2 across the periodic table at comparable cost. RPA+AXK thus is an accurate, non-empirical, and robust tool to assess and improve semi-local density functional theory for a wide range of systems previously inaccessible to first-principles electronic structure calculations.

Bates, Jefferson E.; Furche, Filipp, E-mail: filipp.furche@uci.edu [Department of Chemistry, University of California, Irvine, 1102 Natural Sciences II, Irvine, California 92697-2025 (United States)] [Department of Chemistry, University of California, Irvine, 1102 Natural Sciences II, Irvine, California 92697-2025 (United States)

2013-11-07T23:59:59.000Z

371

cDNA encoding a polypeptide including a hevein sequence  

DOE Patents [OSTI]

A cDNA clone (HEV1) encoding hevein was isolated via polymerase chain reaction (PCR) using mixed oligonucleotides corresponding to two regions of hevein as primers and a Hevea brasiliensis latex cDNA library as a template. HEV1 is 1018 nucleotides long and includes an open reading frame of 204 amino acids. The deduced amino acid sequence contains a putative signal sequence of 17 amino acid residues followed by a 187 amino acid polypeptide. The amino-terminal region (43 amino acids) is identical to hevein and shows homology to several chitin-binding proteins and to the amino-termini of wound-induced genes in potato and poplar. The carboxyl-terminal portion of the polypeptide (144 amino acids) is 74-79% homologous to the carboxyl-terminal region of wound-inducible genes of potato. Wounding, as well as application of the plant hormones abscisic acid and ethylene, resulted in accumulation of hevein transcripts in leaves, stems and latex, but not in roots, as shown by using the cDNA as a probe. A fusion protein was produced in E. coli from the protein of the present invention and maltose binding protein produced by the E. coli.

Raikhel, Natasha V. (Okemos, MI); Broekaert, Willem F. (Dilbeek, BE); Chua, Nam-Hai (Scarsdale, NY); Kush, Anil (New York, NY)

1999-05-04T23:59:59.000Z

372

CDNA encoding a polypeptide including a hevein sequence  

DOE Patents [OSTI]

A cDNA clone (HEV1) encoding hevein was isolated via polymerase chain reaction (PCR) using mixed oligonucleotides corresponding to two regions of hevein as primers and a Hevea brasiliensis latex cDNA library as a template. HEV1 is 1018 nucleotides long and includes an open reading frame of 204 amino acids. The deduced amino acid sequence contains a putative signal sequence of 17 amino acid residues followed by a 187 amino acid polypeptide. The amino-terminal region (43 amino acids) is identical to hevein and shows homology to several chitin-binding proteins and to the amino-termini of wound-induced genes in potato and poplar. The carboxyl-terminal portion of the polypeptide (144 amino acids) is 74-79% homologous to the carboxyl-terminal region of wound-inducible genes of potato. Wounding, as well as application of the plant hormones abscisic acid and ethylene, resulted in accumulation of hevein transcripts in leaves, stems and latex, but not in roots, as shown by using the cDNA as a probe. A fusion protein was produced in E. coli from the protein of the present invention and maltose binding protein produced by the E. coli.

Raikhel, Natasha V. (Okemos, MI); Broekaert, Willem F. (Dilbeek, BE); Chua, Nam-Hai (Scarsdale, NY); Kush, Anil (New York, NY)

1995-03-21T23:59:59.000Z

373

cDNA encoding a polypeptide including a hevein sequence  

DOE Patents [OSTI]

A cDNA clone (HEV1) encoding hevein was isolated via polymerase chain reaction (PCR) using mixed oligonucleotides corresponding to two regions of hevein as primers and a Hevea brasiliensis latex cDNA library as a template. HEV1 is 1018 nucleotides long and includes an open reading frame of 204 amino acids. The deduced amino acid sequence contains a putative signal sequence of 17 amino acid residues followed by a 187 amino acid polypeptide. The amino-terminal region (43 amino acids) is identical to hevein and shows homology to several chitin-binding proteins and to the amino-termini of wound-induced genes in potato and poplar. The carboxyl-terminal portion of the polypeptide (144 amino acids) is 74--79% homologous to the carboxyl-terminal region of wound-inducible genes of potato. Wounding, as well as application of the plant hormones abscisic acid and ethylene, resulted in accumulation of hevein transcripts in leaves, stems and latex, but not in roots, as shown by using the cDNA as a probe. A fusion protein was produced in E. coli from the protein of the present invention and maltose binding protein produced by the E. coli. 12 figs.

Raikhel, N.V.; Broekaert, W.F.; Chua, N.H.; Kush, A.

1999-05-04T23:59:59.000Z

374

cDNA encoding a polypeptide including a hevein sequence  

DOE Patents [OSTI]

A cDNA clone (HEV1) encoding hevein was isolated via polymerase chain reaction (PCR) using mixed oligonucleotides corresponding to two regions of hevein as primers and a Hevea brasiliensis latex cDNA library as a template. HEV1 is 1,018 nucleotides long and includes an open reading frame of 204 amino acids. The deduced amino acid sequence contains a putative signal sequence of 17 amino acid residues followed by a 187 amino acid polypeptide. The amino-terminal region (43 amino acids) is identical to hevein and shows homology to several chitin-binding proteins and to the amino-termini of wound-induced genes in potato and poplar. The carboxyl-terminal portion of the polypeptide (144 amino acids) is 74--79% homologous to the carboxyl-terminal region of wound-inducible genes of potato. Wounding, as well as application of the plant hormones abscisic acid and ethylene, resulted in accumulation of hevein transcripts in leaves, stems and latex, but not in roots, as shown by using the cDNA as a probe. A fusion protein was produced in E. coli from the protein of the present invention and maltose binding protein produced by the E. coli. 11 figures.

Raikhel, N.V.; Broekaert, W.F.; Chua, N.H.; Kush, A.

1995-03-21T23:59:59.000Z

375

Process simulation of refinery units including chemical reactors  

Science Journals Connector (OSTI)

Process simulation methods for design and operation of refinery units are well established as long as no chemical reactors are included. The feedstocks are divided into pseudo-components which enables calculation of phase equilibria and transport properties. When chemical reactors are present some chemical conversion takes place which obviously affects the nature of the pseudo-components and their properties. The stream leaving the reactor will not only be of a different composition than the stream entering the reactor but in addition, the pseudo-components making up the outlet stream will also have other physical properties than the ones in the inlet stream. These changes affect not only the reactor unit but also the simulation of the whole flow-sheet. The paper presents a detailed model for an adiabatic distillate hydrotreater which takes into account the elemental composition of the feed. A special simulation strategy has been developed to incorporate such reactor units into process simulators. Finally, the simulation strategy is illustrated for a hydrotreating plant.

Jens A. Hansen; Barry H. Cooper

1992-01-01T23:59:59.000Z

376

Screened Coulomb interactions in metallic alloys. ??II.?Screening beyond the single-site and atomic-sphere approximations  

Science Journals Connector (OSTI)

A quantitative description of the configurational part of the total energy of metallic alloys with substantial atomic size difference cannot be achieved in the atomic-sphere approximation: It needs to be corrected at least for the multipole-moment interactions in the Madelung part of the one-electron potential and energy. In the case of a random alloy such interactions can be accounted for only by lifting the atomic-sphere and single-site approximations, in order to include the polarization due to local environment effects. Nevertheless, a simple parametrization of the screened Coulomb interactions for the ordinary single-site methods, including the generalized perturbation method, is still possible. We obtained such a parametrization for bulk and surface NiPt alloys, which allows one to obtain quantitatively accurate effective interactions in this system.

A. V. Ruban; S. I. Simak; P. A. Korzhavyi; H. L. Skriver

2002-06-26T23:59:59.000Z

377

Shear Viscosity in the Post-quasistatic Approximation  

E-Print Network [OSTI]

We apply the post-quasi--static approximation, an iterative method for the evolution of self-gravitating spheres of matter, to study the evolution of anisotropic non-adiabatic radiating and dissipative distributions in General Relativity. Dissipation is described by viscosity and free-streaming radiation, assuming an equation of state to model anisotropy induced by the shear viscosity. We match the interior solution, in non-comoving coordinates, with the Vaidya exterior solution. Two simple models are presented, based on the Schwarzschild and Tolman VI solutions, in the non--adiabatic and adiabatic limit. In both cases the eventual collapse or expansion of the distribution is mainly controlled by the anisotropy induced by the viscosity.

C. Peralta; L. Rosales; B. Rodrí guez-Mueller; W. Barreto

2010-03-09T23:59:59.000Z

378

Nuclear relativistic hartree-fock approximation with effective pions  

SciTech Connect (OSTI)

The effect of an interaction between the {sigma}- and {pi}-meson fields, as well as that of the mixture of pseudoscalar (PS) and pseudovector (PV) couplings for the {pi}N vertex on the shell structure of finite nuclei are analyzed in the framework of different nonlinear nuclearmodels based on the relativistic Hartree-Fock approximation. For the case of a dominant {pi}N PV coupling, it is found that if the {sigma}-{pi} interaction generates an effective pion mass increasing with the nuclear density, the unrealistic effect of pions on the shell structure can be strongly reduced, keeping, roughly, the contribution of pions to the total binding energy. The {pi}N PS coupling increases slightly the spin-orbit splittings and the binding energy of the single-particle levels.

Marcos, S., E-mail: marcoss@unican.es; Lopez-Quelle, M.; Niembro, R. [Universidad de Cantabria (Spain); Savushkin, L. N. [St. Petersburg University for Telecommunications (Russian Federation)

2012-12-15T23:59:59.000Z

379

Coherent quasiparticle approximation cQPA and nonlocal coherence  

E-Print Network [OSTI]

We show that the dynamical Wigner functions for noninteracting fermions and bosons can have complex singularity structures with a number of new solutions accompanying the usual mass-shell dispersion relations. These new shell solutions are shown to encode the information of the quantum coherence between particles and antiparticles, left and right moving chiral states and/or between different flavour states. Analogously to the usual derivation of the Boltzmann equation, we impose this extended phase space structure on the full interacting theory. This extension of the quasiparticle approximation gives rise to a self-consistent equation of motion for a density matrix that combines the quantum mechanical coherence evolution with a well defined collision integral giving rise to decoherence. Several applications of the method are given, for example to the coherent particle production, electroweak baryogenesis and study of decoherence and thermalization.

Matti Herranen; Kimmo Kainulainen; Pyry M. Rahkila

2009-12-14T23:59:59.000Z

380

Finite Approximations to Quantum Physics: Quantum Points and their Bundles  

E-Print Network [OSTI]

There exists a physically well motivated method for approximating manifolds by certain topological spaces with a finite or a countable set of points. These spaces, which are partially ordered sets (posets) have the power to effectively reproduce important topological features of continuum physics like winding numbers and fractional statistics, and that too often with just a few points. In this work, we develop the essential tools for doing quantum physics on posets. The poset approach to covering space quantization, soliton physics, gauge theories and the Dirac equation are discussed with emphasis on physically important topological aspects. These ideas are illustrated by simple examples like the covering space quantization of a particle on a circle, and the sine-Gordon solitons.

A. P. Balachandran; G. Bimonte; E. Ercolessi; P. Teotonio-Sobrinho

1993-10-04T23:59:59.000Z

Note: This page contains sample records for the topic "arabia include approximately" 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

Quantifier elimination for approximate Beals-Kartashova factorization  

E-Print Network [OSTI]

The only known constructive factorization algorithm for linear partial differential operators (LPDOs) is Beals-Kartashova (BK) factorization \\cite{bk2005}. One of the most interesting features of BK-factorization: at the beginning all the first-order factors are constructed and afterwards the factorization condition(s) should be checked. This leads to the important application area - namely, numerical simulations which could be simplified substantially if instead of computation with one LPDE of order $n$ we will be able to proceed computations with $n$ LPDEs all of order 1. In numerical simulations it is not necessary to fulfill factorization conditions exactly but with some given accuracy, which we call approximate factorization. The idea of the present paper is to look into the feasibility of solving problems of this kind using quantifier elinination by cylindrical algebraic decomposition.

Elena Kartashova; Scott McCallum

2007-01-07T23:59:59.000Z

382

ANALYTIC APPROXIMATION OF CARBON CONDENSATION ISSUES IN TYPE II SUPERNOVAE  

SciTech Connect (OSTI)

I present analytic approximations for some issues related to condensation of graphite, TiC, and silicon carbide in oxygen-rich cores of supernovae of Type II. Increased understanding, which mathematical analysis can support, renders researchers more receptive to condensation in O-rich supernova gases. Taking SN 1987A as typical, my first analysis shows why the abundance of CO molecules reaches an early maximum in which free carbon remains more abundant than CO. This analysis clarifies why O-rich gas cannot oxidize C if {sup 56}Co radioactivity is as strong as in SN 1987A. My next analysis shows that the CO abundance could be regarded as being in chemical equilibrium if the CO molecule is given an effective binding energy rather than its laboratory dissociation energy. The effective binding energy makes the thermal dissociation rate of CO equal to its radioactive dissociation rate. This preserves possible relevance for the concept of chemical equilibrium. My next analysis shows that the observed abundances of CO and SiO molecules in SN 1987A rule out frequent suggestions that equilibrium condensation of SUNOCONs has occurred following atomic mixing of the He-burning shell with more central zones in such a way as to reproduce roughly the observed spectrum of isotopes in SUNOCONs while preserving C/O > 1. He atoms admixed along with the excess carbon would destroy CO and SiO molecules, leaving their observed abundances unexplained. The final analysis argues that a chemical quasiequilibrium among grains (but not gas) may exist approximately during condensation, so that its computational use is partially justified as a guide to which mineral phases would be stable against reactions with gas. I illustrate this point with quasiequilibrium calculations by Ebel and Grossman that have shown that graphite is stable even when O/C >1 if prominent molecules are justifiably excluded from the calculation of chemical equilibrium.

Clayton, Donald D., E-mail: claydonald@gmail.com [Department of Physics and Astronomy, Clemson University, Clemson, SC (United States)

2013-01-01T23:59:59.000Z

383

Quantum Algorithms for Approximating the Effective Resistances in Electrical Networks  

E-Print Network [OSTI]

The theory of electrical network has many applications in algorithm design and analysis. It is an important task to compute the basic quantities about electrical networks, such as electrical flows and effective resistances, as quickly as possible. Classically, to compute these quantities, one basically need to solve a Laplacian linear system, and the best known algorithms take $\\tilde{O}(m)$ time, where $m$ is the number of edges. In this paper, we present two quantum algorithms for approximating the effective resistance between any two vertices in an electrical network. Both of them have time complexity polynomial in $\\log{n}$, $d$, $c$, $1/\\phi$ and $1/\\epsilon$, where $n$ is the number of vertices, $d$ is the maximum degree of the vertices, $c$ is the ratio of the largest to the smallest edge resistance, $\\phi$ is the expansion of the network, and $\\epsilon$ is the relative error. In particular, when $d$ and $c$ are small and $\\phi$ is large, our algorithms run very fast. In contrast, it is unknown whether classical algorithms can solve this case very fast. Furthermore, we prove that the polynomial dependence on the inverse expansion (i.e. $1/\\phi$) is necessary. As a consequence, our algorithms cannot be significantly improved. Finally, as a by-product, our second algorithm also produces a quantum state approximately proportional to the electrical flow between any two vertices, which might be of independent interest. Our algorithms are based on using quantum tools to analyze the algebraic properties of graph-related matrices. While one of them relies on inverting the Laplacian matrix, the other relies on projecting onto the kernel of the weighted incidence matrix. It is hopeful that more quantum algorithms can be developed in similar way.

Guoming Wang

2013-11-08T23:59:59.000Z

384

An approximate internal model principle: Applications to nonlinear models of  

E-Print Network [OSTI]

that the system has an internal model in the feedback loop. In this paper we relax the requirement is to achieve adaptation include blood calcium regulation (El-Samad et al. 2002), neuronal control

Sontag, Eduardo

385

Extended sudden approximation modeling of high-energy nucleon-removal reactions  

Science Journals Connector (OSTI)

Calculations based on the sudden approximation have been performed to describe high-energy single-nucleon removal reactions. Within this approach, which takes as its starting point the formalism developed to describe the breakup of well-developed single-neutron halo systems, the nucleon-removal cross section and the full three-dimensional momentum distributions of the core fragments, including absorption, diffraction, Coulomb, and nuclear-Coulomb interference amplitudes, have been computed. The Coulomb, breakup has been treated to all orders for the dipole interaction. The results are compared here to experimental data for a range of light, neutron-rich psd-shell nuclei taken at beam energies of 43–68MeV?nucleon. Good agreement is found for the inclusive cross sections and both the longitudinal and transverse momentum distributions. In the case of C17, comparison is also made with the results of calculations using the transfer-to-the-continuum model. The three-dimensional momentum distributions computed within the sudden approximation model exhibit longitudinal and transverse momentum components that are strongly coupled by the reaction for s-wave states, while no such effect is apparent for d waves. Incomplete detection of transverse momenta arising from limited experimental acceptances thus leads to a narrowing of the longitudinal distributions for nuclei with significant s-wave valence neutron configurations, as confirmed by the data. Asymmetries in the longitudinal momentum distributions attributed to diffractive dissociation are also explored.

F. Carstoiu; E. Sauvan; N. A. Orr; A. Bonaccorso

2004-11-04T23:59:59.000Z

386

Area mining of a mountaintop: a methodology for determining approximate original contour  

SciTech Connect (OSTI)

The Surface Mining Control and Reclamation Act (P. L. 95-87) and the regulations promulgated therefrom do not precisely define approximate original contour (AOC). Congressional intent was not that the backfilling operation attain the pre-mine elevation as much as it was to blend with surrounding topography. As a result, determining acceptable postmining backfill configurations has been interpreted differently by permitting authorities, industry, and environmental action groups. This paper consolidates the regulations and other considerations applicable to AOC in area mining of mountaintops, including stability, hydrology, ecology, aesthetics, and land use. Each approach is evaluated and it is demonstrated that a combination of approaches is the most feasible means to satisfy the legal, geotechnical and environmental requirements. A conclusion proposes policies which might be utilized by a regulatory authority to approve permits.

Robinson, M.K.; Borda, A.B.; Holbrook, J.A. II; Dougherty, M.T.

1980-12-01T23:59:59.000Z

387

Non-intrusive Low-Rank Separated Approximation of High-Dimensional Stochastic Models  

E-Print Network [OSTI]

This work proposes a sampling-based (non-intrusive) approach within the context of low-rank separated representations to tackle the issue of curse-of-dimensionality associated with the solution of models, e.g., PDEs/ODEs, with high-dimensional random inputs. Under some conditions discussed in details, the number of random realizations of the solution, required for a successful approximation, grows linearly with respect to the number of random inputs. The construction of the separated representation is achieved via a regularized alternating least-squares regression, together with an error indicator to estimate model parameters. The computational complexity of such a construction is quadratic in the number of random inputs. The performance of the method is investigated through its application to three numerical examples including two ODE problems with high-dimensional random inputs.

Alireza Doostan; AbdoulAhad Validi; Gianluca Iaccarino

2012-10-04T23:59:59.000Z

388

Complete equation of state for neutron stars using the relativistic Hartree-Fock approximation  

SciTech Connect (OSTI)

We construct the equation of state in a wide-density range for neutron stars within relativistic Hartree-Fock approximation. The properties of uniform and nonuniform nuclear matter are studied consistently. The tensor couplings of vector mesons to baryons due to exchange contributions (Fock terms) are included, and the change of baryon internal structure in matter is also taken into account using the quark-meson coupling model. The Thomas-Fermi calculation is adopted to describe nonuniform matter, where the lattice of nuclei and the neutron drip out of nuclei are considered. Even if hyperons exist in the core of a neutron star, we obtain the maximum neutron-star mass of 1.95M{sub ?}, which is consistent with the recently observed massive pulsar, PSR J1614-2230. In addition, the strange vector (?) meson also plays a important role in supporting a massive neutron star.

Miyatsu, Tsuyoshi; Cheoun, Myung-Ki [Department of Physics, Soongsil University, Seoul 156-743 (Korea, Republic of); Yamamuro, Sachiko; Nakazato, Ken'ichiro [Department of Physics, Faculty of Science and Technology, Tokyo University of Science (TUS), Noda 278-8510 (Japan)

2014-05-02T23:59:59.000Z

389

Adsorption of molecular gases on porous materials in the SAFT-VR approximation  

E-Print Network [OSTI]

A simple molecular thermodynamic approach is applied to the study of the adsorption of gases of chain molecules on solid surfaces. We use a model based on the Statistical Associating Fluid Theory for Variable Range (SAFT-VR) potentials [A. Gil-Villegas, A. Galindo, P. J. Whitehead, S. J. Mills, G. Jackson, A. N. Burgess, J. Chem. Phys. 106 (1997) 4168] that we extend by including a quasi-two-dimensional approximation to describe the adsorption properties of this type of real gases [A. Martinez, M. Castro, C. McCabe, A. Gil-Villegas, J. Chem. Phys. 126 (2007) 074707]. The model is applied to ethane, ethylene, propane, and carbon dioxide adsorbed on activated carbon and silica gel, which are porous media of significant industrial interest. We show that the adsorption isotherms obtained by means of the present SAFT-VR modeling are in fair agreement with the experimental results provided in the literature

Castro, M; Martinez, A; Rosu, H C; 10.1016/j.physa.2010.04.028

2010-01-01T23:59:59.000Z

390

A comparative assessment of the economics of plutonium disposition including comparison with other nuclear fuel cycles  

SciTech Connect (OSTI)

DOE has been evaluating three technologies for the disposition of approximately 50 metric tons of surplus plutonium from defense-related programs: reactors, immobilization, and deep boreholes. As part of the process supporting an early CY 1997 Record of Decision (ROD), a comprehensive assessment of technical viability, cost, and schedule has been conducted. Oak Ridge National Laboratory has managed and coordinated the life-cycle cost (LCC) assessment effort for this program. This paper discusses the economic analysis methodology and the results prior to ROD. Other objectives of the paper are to discuss major technical and economic issues that impact plutonium disposition cost and schedule. Also to compare the economics of a once-through weapons-derived MOX nuclear fuel cycle to other fuel cycles, such as those utilizing spent fuel reprocessing. To evaluate the economics of these technologies on an equitable basis, a set of cost estimating guidelines and a common cost-estimating format were utilized by all three technology teams. This paper also includes the major economic analysis assumptions and the comparative constant-dollar and discounted-dollar LCCs.

Williams, K.A.; Miller, J.W.; Reid, R.L.

1997-05-01T23:59:59.000Z

391

Approximation algorithms for a geometric set cover problem  

Science Journals Connector (OSTI)

Given a finite set of straight line segments S in R 2 and some k ? N , is there a subset V of points on segments in S with | V | ? k such that each segment of S contains at least one point in V ? This is a special case of the set covering problem where the family of subsets given can be taken as a set of intersections of the straight line segments in S . Requiring that the given subsets can be interpreted geometrically this way is a major restriction on the input, yet we have shown that the problem is still strongly NP-complete [5]. In light of this result, we studied the accuracy of two polynomial-time approximation algorithms along with a third heuristic based algorithm which return segment coverings. We obtain certain theoretical results, and in particular we show that the performance ratio for each of these algorithms is unbounded, in general. Despite this, our experimental results suggest that the cases where this ratio exceeds 2 are rare for “reasonable” methods of placing segments. This is evidence that these polynomial-time algorithms solve the problem accurately in practice.

Valentin E. Brimkov; Andrew Leach; Jimmy Wu; Michael Mastroianni

2012-01-01T23:59:59.000Z

392

Planar F-Deletion: Approximation and Optimal FPT Algorithms  

E-Print Network [OSTI]

Let F be a finite set of graphs. In the F-Deletion problem, we are given an n-vertex, m-edge graph G and an integer k as input, and asked whether at most k vertices can be deleted from G such that the resulting graph does not contain a graph from F as a minor. F-Deletion is a generic problem and by selecting different sets of forbidden minors F, one can obtain various fundamental problems such as Vertex Cover, Feedback Vertex Set or Treewidth t-Deletion. In this paper we obtain a number of generic algorithmic results about Planar F-Deletion, when F contains at least one planar graph. The highlights of our work are - A randomized O(nm) time constant factor approximation algorithm for the optimization version of Planar F-Deletion. - A randomized O(2^{O(k)} n) time parameterized algorithm for Planar F-Deletion when F is connected. Here a family F is called connected if every graph in F is connected. The algorithm can be made deterministic at the cost of making the polynomial factor in the running time n\\log^2 n ...

Fomin, Fedor; Misra, Neeldhara; Saurabh, Saket

2012-01-01T23:59:59.000Z

393

Testing the accuracy of radiative cooling approximations in SPH simulations  

E-Print Network [OSTI]

Hydrodynamical simulations of star formation have stimulated a need to develop fast and robust algorithms for evaluating radiative cooling. Here we undertake a critical evaluation of what is currently a popular method for prescribing cooling in SPH simulations, i.e. the polytropic cooling due originally to Stamatellos et al. This method uses the local density and potential to estimate the column density and optical depth to each particle and then uses these quantities to evaluate an approximate expression for the net radiative cooling. We evaluate the algorithm by considering both spherical and disc-like systems with analytic density and temperature structures. In spherical systems, the total cooling rate computed by the method is within around 20 for the astrophysically relevant case of opacity dominated by ice grains and is correct to within a factor of order unity for a range of opacity laws. In disc geometry, however, the method systematically under-estimates the cooling by a large factor at all heights i...

Wilkins, Daniel R

2011-01-01T23:59:59.000Z

394

Analytical expressions for the gate utilization factors of passive multiplicity counters including signal build-up  

SciTech Connect (OSTI)

In the realm of nuclear safeguards, passive neutron multiplicity counting using shift register pulse train analysis to nondestructively quantify Pu in product materials is a familiar and widely applied technique. The approach most commonly taken is to construct a neutron detector consisting of {sup 3}He filled cylindrical proportional counters embedded in a high density polyethylene moderator. Fast neutrons from the item enter the moderator and are quickly slowed down, on timescales of the order of 1-2 {micro}s, creating a thermal population which then persists typically for several 10's {micro}s and is sampled by the {sup 3}He detectors. Because the initial transient is of comparatively short duration it has been traditional to treat it as instantaneous and furthermore to approximate the subsequent capture time distribution as exponential in shape. With these approximations simple expressions for the various Gate Utilization Factors (GUFs) can be obtained. These factors represent the proportion of time correlated events i.e. Doubles and Triples signal present in the pulse train that is detected by the coincidence gate structure chosen (predelay and gate width settings of the multiplicity shift register). More complicated expressions can be derived by generalizing the capture time distribution to multiple time components or harmonics typically present in real systems. When it comes to applying passive neutron multiplicity methods to extremely intense (i.e. high emission rate and highly multiplying) neutron sources there is a drive to use detector types with very fast response characteristics in order to cope with the high rates. In addition to short pulse width, detectors with a short capture time profile are also desirable so that a short coincidence gate width can be set in order to reduce the chance or Accidental coincidence signal. In extreme cases, such as might be realized using boron loaded scintillators, the dieaway time may be so short that the build-up (thermalization transient) within the detector cannot be ignored. Another example where signal build-up might be observed is when a {sup 3}He based system is used to track the evolution of the time correlated signal created by a higher multiplying item within a reflective configuration such as the measurement of a spent fuel assembly. In this work we develop expressions for the GUFs which include signal build-up.

Croft, Stephen [Los Alamos National Laboratory; Evans, Louise G [Los Alamos National Laboratory; Schear, Melissa A [Los Alamos National Laboratory

2010-01-01T23:59:59.000Z

395

E-Print Network 3.0 - approximate half-intensity widths Sample...  

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

linear time algorithm for computing a (1+)-approximation to the minimum width 2-slab cover of P... a set P of n points in IR3 , one can maintain an -approximate minimum width...

396

Low-rank approximations with sparse factors II: penalized methods with discrete Newton-like iterations  

E-Print Network [OSTI]

H. Zha, and H. Simon. Low-rank Approximations with Sparse5) H. Simon and H. Zhao Low-rank matrix approximation usingZhang. Matrices with low-rank-plus-shift structure: partial

Simon, Horst

2011-01-01T23:59:59.000Z

397

A simulation–approximation approach to sample size planning for high-dimensional classification studies  

Science Journals Connector (OSTI)

......simulation-approximation approach to sample size...Environmental Science, Policy, Management, University...challenging. The approach developed here...approximation approaches to different...Environmental Science, Policy, & Management, University......

Perry de Valpine; Hans-Marcus Bitter; Michael P. S. Brown; Jonathan Heller

2009-07-01T23:59:59.000Z

398

E-Print Network 3.0 - approximate l-state solutions Sample Search...  

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

where C... 'o','x','+'. Omit C for a connected graph. APPROXIMATE SOLUTIONS The matlab commands eul, rk2, and rk4 can be used... to obtain approximate solutions of the ......

399

E-Print Network 3.0 - approximate kinetic equations Sample Search...  

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

equation. Reactor kinetics and Summary: equations, prompt jump approximation; subcritical reactor kinetics, circulating fuel reactor dynamics 5... solution to neutron...

400

Approximation Order Equivalence Properties of Manifold-Valued Data Subdivision Schemes  

E-Print Network [OSTI]

, is there an approximation operator Ah = Ah;r,R that maps samples of any f : R M on a grid of size h to an approximant fh on Curves and Surfaces (Avignon, France, June 29-July 5, 2006.) and further discussed in a mini, is there an approximation operator Ah = Ah;r,R that maps samples of any f : R M on a grid of size h to an approximant fh

Yu, Thomas P.-Y.

Note: This page contains sample records for the topic "arabia include approximately" 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

A Time-Dependent Born–Oppenheimer Approximation with Exponentially Small Error Estimates  

Science Journals Connector (OSTI)

...We present the construction of an exponentially accurate time-dependent Born–Oppenheimer approximation for molecular quantum mechanics.

George A. Hagedorn; Alain Joye

2001-11-01T23:59:59.000Z

402

A Time{Dependent Born{Oppenheimer Approximation with Exponentially Small Error Estimates  

E-Print Network [OSTI]

A Time{Dependent Born{Oppenheimer Approximation with Exponentially Small Error Estimates George A{ Oppenheimer approximation for molecular quantum mechanics. We study molecular systems whose electron masses. The small parameter that governs the approximation is the usual Born{Oppenheimer expansion parameter #15

Joye, Alain

403

A Time--Dependent Born--Oppenheimer Approximation with Exponentially Small Error Estimates  

E-Print Network [OSTI]

A Time--Dependent Born--Oppenheimer Approximation with Exponentially Small Error Estimates George A--dependent Born-- Oppenheimer approximation for molecular quantum mechanics. We study molecular systems whose parameter that governs the approximation is the usual Born--Oppenheimer expansion parameter #, where # 4

Hagedorn, George A.

404

Motivation Green's functions The GW Approximation The Bethe-Salpeter Equation Introduction to Green's functions  

E-Print Network [OSTI]

Motivation Green's functions The GW Approximation The Bethe-Salpeter Equation Introduction to Green=whiteMotivation Green's functions The GW Approximation The Bethe-Salpeter Equation Outline 1 Motivation 2 Green's functions 3 The GW Approximation 4 The Bethe-Salpeter Equation #12;bg=whiteMotivation Green's functions

Botti, Silvana

405

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

406

Comparison of Born-Oppenheimer and hyperspherical adiabatic approximations in the trinucleon problem  

Science Journals Connector (OSTI)

Ground state energies of the three-nucleon system interacting via standard S-projected potentials are studied using Born-Oppenheimer and hyperspherical adiabatic approximations. The extreme and the uncoupled hyperspherical adiabatic approximations, which are the lower and upper bounds for the exact ground state energy, are found to define a narrow band with the Born-Oppenheimer approximation lying close to it. While the hyperspherical adiabatic approximation conserves the basic symmetry requirements, the other does not. In spite of this, the Born-Oppenheimer approximation is found to be comparable to the other for potentials with a soft core repulsion.

T. K. Das; H. T. Coelho; V. P. Brito

1993-11-01T23:59:59.000Z

407

Skyrme, Peierls-Yoccoz, and statistical approximations for the inertia parameter  

Science Journals Connector (OSTI)

Angular momentum operator identities are used to show that Skyrme's expression can be written using the y component of angular momentum only. It is shown that the Gaussian approximation for the matrix element of Jy4 leads to the Peierls-Yoccoz expression. A new approximation based on the theory of probability is introduced. The numerical calculations for the 2s-1d shell nuclei show that the inverse of the inertia parameter using the statistical approximation is much closer to Skyrme's value than the one given by the Peierls-Yoccoz approximation.[NUCLEAR STRUCTURE Approximations for nuclear inertia parameter.

Nazakat Ullah

1978-02-01T23:59:59.000Z

408

Beyond the Born-Oppenheimer approximation with quantum Monte Carlo  

E-Print Network [OSTI]

In this work we develop tools that enable the study of non-adiabatic effects with variational and diffusion Monte Carlo methods. We introduce a highly accurate wave function ansatz for electron-ion systems that can involve a combination of both fixed and quantum ions. We explicitly calculate the ground state energies of H$_{2}$, LiH, H$_{2}$O and FHF$^{-}$ using fixed-node quantum Monte Carlo with wave function nodes that explicitly depend on the ion positions. The obtained energies implicitly include the effects arising from quantum nuclei and electron-nucleus coupling. We compare our results to the best theoretical and experimental results available and find excellent agreement.

Tubman, Norm M; Hammes-Schiffer, Sharon; Ceperley, David M

2014-01-01T23:59:59.000Z

409

Artificial neural network development for stress analysis of steel catenary risers: Sensitivity study and approximation of static stress range  

Science Journals Connector (OSTI)

Abstract Fatigue design of steel catenary risers (SCRs) is an important challenge especially in the touchdown zone (TDZ). Numerous parameters affect the fatigue damage in the TDZ, including those pertaining to riser motions, riser characteristics and soil properties. So far, only a few sensitivity studies have been published with limited applications, considering small ranges, investigating only a selection of input parameters or failing to examine the interactions between input parameters. This paper aims to test the robustness of previous research and extend the ranges of the input parameters for SCR systems under static loading, by means of numerical simulations. An approximation of the critical stress range in the TDZ defined by the authors previously was refined to assist the sensitivity studies. A large database was created using an automation subroutine coded in Python programming language that links the marine analysis software OrcaFlex and the optimisation software modeFRONTIER. Design of experiment techniques were used for post-processing and quantify the relative effects of the various dimensionless groups and their interactions. An approximation using a series of artificial neural networks is presented; it successfully approximates over 99% of the cases of the database with an accuracy of ±5%.

Lucile M. Quéau; Mehrdad Kimiaei; Mark F. Randolph

2014-01-01T23:59:59.000Z

410

Study on the structure of the four-quark states in terms of the Born-Oppenheimer approximation  

E-Print Network [OSTI]

In this work, we use the Born-Oppenheimer approximation where the potential between atoms can be approximated as a function of distance between the two nuclei to study the four-quark bound states. By the approximation, Heitler and London calculated the spectrum of hydrogen molecule which includes two protons (heavy) and two electrons (light). Generally, the observed exotic mesons $Z_b(10610)$, $Z_b(10650)$, $Z_c(3900)$ and $Z_c(4025)$($Z_c(4020)$) may be molecular states of two physical mesons and/or in diquark-anti-diquark structures. In analog to the Heitler-London method for calculating the mass of hydrogen molecule, we investigate whether there exist energy minima for these two structures. By contrary to the hydrogen molecule case where only the spin-triplet possesses an energy minimum, there exist minima for both of them. It implies that both molecule and tetraquark states can be stable objects. But since they have the same quantum numbers, the two states may mix to result in physical states. A consequen...

Liu, Xue-Wen; Ding, Yi-Bing; Li, Xue-Qian

2014-01-01T23:59:59.000Z

411

Study on the structure of the four-quark states in terms of the Born-Oppenheimer approximation  

E-Print Network [OSTI]

In this work, we use the Born-Oppenheimer approximation where the potential between atoms can be approximated as a function of distance between the two nuclei to study the four-quark bound states. By the approximation, Heitler and London calculated the spectrum of hydrogen molecule which includes two protons (heavy) and two electrons (light). Generally, the observed exotic mesons $Z_b(10610)$, $Z_b(10650)$, $Z_c(3900)$ and $Z_c(4025)$($Z_c(4020)$) may be molecular states of two physical mesons and/or in diquark-anti-diquark structures. In analog to the Heitler-London method for calculating the mass of hydrogen molecule, we investigate whether there exist energy minima for these two structures. By contrary to the hydrogen molecule case where only the spin-triplet possesses an energy minimum, there exist minima for both of them. It implies that both molecule and tetraquark states can be stable objects. But since they have the same quantum numbers, the two states may mix to result in physical states. A consequence would be that one may expect to experimentally observe partner exotic states co-existing with $Z_b(10610)$, $Z_b(10650)$, $Z_c(3900)$ and $Z_c(4025)$($Z_c(4020)$).

Xue-Wen Liu; Hong-Wei Ke; Yi-Bing Ding; Xue-Qian Li

2014-11-01T23:59:59.000Z

412

ARM: Surface Radiation Measurement Quality Control testing, including climatologically configurable limits  

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

Surface Radiation Measurement Quality Control testing, including climatologically configurable limits

Hodges, Gary; Stoffel, Tom; Kutchenreiter, Mark; Kay, Bev; Habte, Aron; Ritsche, Michael; Morris, Victor; Anderberg, Mary

413

Born-Oppenheimer Approximation for the XYZ Mesons  

E-Print Network [OSTI]

Many of the XYZ mesons discovered in the last decade can be identified as bound states in Born-Oppenheimer (B-O) potentials for a heavy quark and antiquark. They include quarkonium hybrids, which are bound states in excited flavor-singlet B-O potentials, and quarkonium tetraquarks, which are bound states in flavor-nonsinglet B-O potentials. We present simple parameterizations of the deepest flavor-singlet B-O potentials. We infer the deepest flavor-nonsinglet B-O potentials from lattice QCD calculations of static adjoint mesons. Selection rules for hadronic transitions are used to identify XYZ mesons that are candidates for ground-state energy levels in the B-O potentials for charmonium hybrids and tetraquarks. The energies of the lowest-energy charmonium hybrids are predicted by using the results of lattice QCD calculations to calculate the energy splittings between the ground states of different B-O potentials and using the Schroedinger equation to determine the splittings between energy levels within a B-O potential.

Eric Braaten; Christian Langmack; D. Hudson Smith

2014-02-03T23:59:59.000Z

414

Born-Oppenheimer Approximation for the XYZ Mesons  

E-Print Network [OSTI]

Many of the XYZ mesons discovered in the last decade can be identified as bound states in Born-Oppenheimer (B-O) potentials for a heavy quark and antiquark. They include quarkonium hybrids, which are bound states in excited flavor-singlet B-O potentials, and quarkonium tetraquarks, which are bound states in flavor-nonsinglet B-O potentials. We present simple parameterizations of the deepest flavor-singlet B-O potentials. We infer the deepest flavor-nonsinglet B-O potentials from lattice QCD calculations of static adjoint mesons. Selection rules for hadronic transitions are used to identify XYZ mesons that are candidates for ground-state energy levels in the B-O potentials for charmonium hybrids and tetraquarks. The energies of the lowest-energy charmonium hybrids are predicted by using the results of lattice QCD calculations to calculate the energy splittings between the ground states of different B-O potentials and using the Schroedinger equation to determine the splittings between energy levels within a B-O...

Braaten, Eric; Smith, D Hudson

2014-01-01T23:59:59.000Z

415

Summary of Time Period-Based and Other Approximation Methods for Determining the Capacity Value of Wind and Solar in the United States: September 2010 - February 2012  

SciTech Connect (OSTI)

This paper updates previous work that describes time period-based and other approximation methods for estimating the capacity value of wind power and extends it to include solar power. The paper summarizes various methods presented in utility integrated resource plans, regional transmission organization methodologies, regional stakeholder initiatives, regulatory proceedings, and academic and industry studies. Time period-based approximation methods typically measure the contribution of a wind or solar plant at the time of system peak - sometimes over a period of months or the average of multiple years.

Rogers, J.; Porter, K.

2012-03-01T23:59:59.000Z

416

Extension of the weak-line approximation and application to correlated-k methods  

SciTech Connect (OSTI)

Global climate models require accurate and rapid computation of the radiative transfer through the atmosphere. Correlated-k methods are often used. One of the approximations used in correlated-k models is the weakline approximation. We introduce an approximation T/sub g/ which reduces to the weak-line limit when optical depths are small, and captures the deviation from the weak-line limit as the extinction deviates from the weak-line limit. This approximation is constructed to match the first two moments of the gamma distribution to the k-distribution of the transmission. We compare the errors of the weak-line approximation with T/sub g/ in the context of a water vapor spectrum. The extension T/sub g/ is more accurate and converges more rapidly than the weak-line approximation.

Conley, A.J.; Collins, W.D.

2011-03-15T23:59:59.000Z

417

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

418

Comment on: "Analytical approximations for the collapse of an empty spherical bubble"  

E-Print Network [OSTI]

We analyze the Rayleigh equation for the collapse of an empty bubble and provide an explanation for some recent analytical approximations to the model. We derive the form of the singularity at the second boundary point and discuss the convergence of the approximants. We also give a rigorous proof of the asymptotic behavior of the coefficients of the power series that are the basis for the approximate expressions.

Paolo Amore; Francisco M. Fernández

2012-08-29T23:59:59.000Z

419

Validity of the shape-independent approximation for Bose-Einstein condensates  

Science Journals Connector (OSTI)

The validity of the shape-independent approximation is studied for three trapped atoms. By comparing the total ground-state energy calculated using pseudopotentials in the Hartree-Fock approximation to the exact ground-state energy, the shape-independent approximation is shown to agree quantitatively only in the low-density limit. It is also shown using configuration interaction that a Dirac ? function is not suitable as a replacement for the two-body interaction in exact theories.

B. D. Esry and Chris H. Greene

1999-08-01T23:59:59.000Z

420

E-Print Network 3.0 - approximate cost estimating Sample Search...  

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

cost estimating Search Powered by Explorit Topic List Advanced Search Sample search results for: approximate cost estimating Page: << < 1 2 3 4 5 > >> 1 Project Cost Management...

Note: This page contains sample records for the topic "arabia include approximately" 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

E-Print Network 3.0 - approximation configuration mixing Sample...  

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

for vertical mix- ing in our runs, on the presumption that errors related to the Boussinesq approximation do... Society NOTES AND CORRESPONDENCE Transient Diapycnal Mixing and...

422

E-Print Network 3.0 - adiabatic approximation Sample Search Results  

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

plumes has been examined in a cartesian two-dimensional box... and the extended Boussinesq approximations. We have also assessed the influence of various forms of thermal...

423

Weapon Engagement Zone Maximum Launch Range Approximation using a Multilayer Perceptron.  

E-Print Network [OSTI]

??This thesis investigates the use of an artificial neural network (ANN), in particular a Multi-Layer Perceptron (MLP), to perform function approximation on truth data representing… (more)

Birkmire, Brian Michael

2011-01-01T23:59:59.000Z

424

E-Print Network 3.0 - approximating partition functions Sample...  

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

Replication and Partitioning Summary: algorithms to find balanced partitions that mini- mize the weight of cut edges, which approximately minimizes... of predicates that...

425

E-Print Network 3.0 - approximation Sample Search Results  

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

Irvine Collection: Mathematics ; Computer Technologies and Information Sciences 14 A MATLAB implementation for best approximation of two-term log-sum-exp function Summary: A...

426

E-Print Network 3.0 - approximative neutrino transport Sample...  

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

neutrino transport Page: << < 1 2 3 4 5 > >> 1 Solar Neutrinos: Solved and Unsolved Problems John N. Bahcall Summary: neutrino emission by its approximate dependence upon the...

427

Protein folding and phylogenetic tree reconstruction using stochastic approximation Monte Carlo.  

E-Print Network [OSTI]

??Recently, the stochastic approximation Monte Carlo algorithm has been proposed by Liang et al. (2005) as a general-purpose stochastic optimization and simulation algorithm. An annealing… (more)

Cheon, Sooyoung

2007-01-01T23:59:59.000Z

428

An optimum approximation of n-point correlation functions of random heterogeneous material systems  

SciTech Connect (OSTI)

An approximate solution for n-point correlation functions is developed in this study. In the approximate solution, weight functions are used to connect subsets of (n-1)-point correlation functions to estimate the full set of n-point correlation functions. In previous related studies, simple weight functions were introduced for the approximation of three and four-point correlation functions. In this work, the general framework of the weight functions is extended and derived to achieve optimum accuracy for approximate n-point correlation functions. Such approximation can be utilized to construct global n-point correlation functions for a system when there exist limited information about these functions in a subset of space. To verify its accuracy, the new formulation is used to approximate numerically three-point correlation functions from the set of two-point functions directly evaluated from a virtually generated isotropic heterogeneous microstructure representing a particulate composite system. Similarly, three-point functions are approximated for an anisotropic glass fiber/epoxy composite system and compared to their corresponding reference values calculated from an experimental dataset acquired by computational tomography. Results from both virtual and experimental studies confirm the accuracy of the new approximation. The new formulation can be utilized to attain a more accurate approximation to global n-point correlation functions for heterogeneous material systems with a hierarchy of length scales.

Baniassadi, M., E-mail: m.baniassadi@ut.ac.ir [School of Mechanical Engineering, College of Engineering, University of Tehran, P.O. Box 11155-4563, Tehran (Iran, Islamic Republic of); University of Strasbourg, ICube/CNRS, 2 Rue Boussingault, 67000 Strasbourg (France); Safdari, M.; Geubelle, P. H. [Aerospace Engineering Department, University of Illinois, 104 S Wright St., Urbana, Illinois 61801 (United States)] [Aerospace Engineering Department, University of Illinois, 104 S Wright St., Urbana, Illinois 61801 (United States); Garmestani, H. [School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive N.W., Atlanta, Georgia 30332-0245 (United States)] [School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive N.W., Atlanta, Georgia 30332-0245 (United States); Ahzi, S. [University of Strasbourg, ICube/CNRS, 2 Rue Boussingault, 67000 Strasbourg (France) [University of Strasbourg, ICube/CNRS, 2 Rue Boussingault, 67000 Strasbourg (France); School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive N.W., Atlanta, Georgia 30332-0245 (United States); Remond, Y. [University of Strasbourg, ICube/CNRS, 2 Rue Boussingault, 67000 Strasbourg (France)] [University of Strasbourg, ICube/CNRS, 2 Rue Boussingault, 67000 Strasbourg (France)

2014-02-21T23:59:59.000Z

429

Estimations de la résolvante pour une molécule diatomique dans l'approximation de Born–Oppenheimer  

Science Journals Connector (OSTI)

...Making use of an adiabatic operator that takes several electronic states into account, we derive a Born–Oppenheimer approximation of the resolvent for a diatomic...

Thierry Jecko

1998-08-01T23:59:59.000Z

430

E-Print Network 3.0 - approximate l0 constrained Sample Search...  

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

Sample search results for: approximate l0 constrained Page: << < 1 2 3 4 5 > >> 1 Optimization Tutorial Constrained Optimization Summary: Interior Point Method Newton Method for...

431

Approximation of inhomogeneous thermal lines via series connection of homogeneous thermal lines  

Science Journals Connector (OSTI)

A method is given for approximating an arbitrary inhomogeneous thermal line (ITL) as a series connection of homogeneous thermal lines (HTL). The method is compared with...

L. S. Eleinikova

1974-10-01T23:59:59.000Z

432

E-Print Network 3.0 - accurate two-phase approximate Sample Search...  

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

of British Columbia Collection: Mathematics 15 Proceedings of FEDSM2005 2005 ASME Fluids Engineering Summer Conference Summary: , the two phase flow can be approximately...

433

Scattering of light by a stratified sphere in high energy approximation  

Science Journals Connector (OSTI)

Glauber's approximation method valid at high energy is used to study light scattering by a stratified sphere. The scattering amplitude is obtained in a simple closed form. The...

Chen, Tuan W

1987-01-01T23:59:59.000Z

434

Evaluation of approximate original contour and postmining land use in West Virginia. Final report  

SciTech Connect (OSTI)

The Office of Surface Mining (OSM) has been working diligently with the West Virginia Division of Environmental Protection (WVDEP) to improve the State`s administration of its approved program in two areas: (1) the standards used by the WVDEP in evaluating whether a particular postmining and land configuration constitutes a return to AOC (approximate original contour); and (2) the postmining land uses which WVDEP approves when it grants a waiver from the AOC requirement. In conjunction with OSM, the WVDEP recently announced proposed new procedures that should both enable the permit reviewer to more easily determine when a site achieves AOC and limit the placement of excess spoil in valleys and streams. In addition, OSM is developing a policy document that will clarify the acceptable postmining land uses for mountaintop-removal and steep slope mining operations with AOC variances. In particular, this document addresses the issue of whether commercial forestry, agriculture, and public facilities, including recreational facilities constitute approvable postmining land uses.

NONE

1999-05-01T23:59:59.000Z

435

Quantum-corrected drift-diffusion models: Solution fixed point map and finite element approximation  

SciTech Connect (OSTI)

This article deals with the analysis of the functional iteration, denoted Generalized Gummel Map (GGM), proposed in [C. de Falco, A.L. Lacaita, E. Gatti, R. Sacco, Quantum-Corrected Drift-Diffusion Models for Transport in Semiconductor Devices, J. Comp. Phys. 204 (2) (2005) 533-561] for the decoupled solution of the Quantum Drift-Diffusion (QDD) model. The solution of the problem is characterized as being a fixed point of the GGM, which permits the establishment of a close link between the theoretical existence analysis and the implementation of a numerical tool, which was lacking in previous non-constructive proofs [N.B. Abdallah, A. Unterreiter, On the stationary quantum drift-diffusion model, Z. Angew. Math. Phys. 49 (1998) 251-275, R. Pinnau, A. Unterreiter, The stationary current-voltage characteristics of the quantum drift-diffusion model, SIAM J. Numer. Anal. 37 (1) (1999) 211-245]. The finite element approximation of the GGM is illustrated, and the main properties of the numerical fixed point map (discrete maximum principle and order of convergence) are discussed. Numerical results on realistic nanoscale devices are included to support the theoretical conclusions.

Falco, Carlo de [School of Mathematical Sciences, Dublin City University, Glasnevin, Dublin 9 (Ireland); Jerome, Joseph W. [Department of Mathematics, Northwestern University, 2033 Sheridan Road, Evanston, IL 60208-2730 (United States); Sacco, Riccardo [Dipartimento di Matematica 'F.Brioschi', Politecnico di Milano, via Bonardi 9, 20133 Milano (Italy)], E-mail: riccardo.sacco@polimi.it

2009-03-20T23:59:59.000Z

436

Composting of soils/sediments and sludges containing toxic organics including high energy explosives. Final report  

SciTech Connect (OSTI)

Laboratory and pilot-scale experimentation were conducted to evaluate composting as an on-site treatment technology to remediate soils contaminated with hazardous waste at DOE`s PANTEX Plant. Suspected contaminated sites within the PANTEX Plant were sampled and analyzed for explosives, other organics, and inorganic wastes. Soils in drainage ditches and playas at PANTEX Plant were found to be contaminated with low levels of explosives (including RDX, HMX, PETN and TATB). Additional sites previously used for solvent disposal were heavily contaminated with solvents and transformation products of the solvent, as well as explosives and by-products of explosives. Laboratory studies were conducted using {sup 14}C-labeled explosives and {sup 14}C-labeled diacetone alcohol contaminated soil loaded into horse manure/hay composts at three rates: 20, 30, and 40%(W/W). The composts were incubated for six weeks at approximately 60{degree}C with continuous aeration. All explosives degraded rapidly and were reduced to below detection limits within 3 weeks in the laboratory studies. {sup 14}C-degradates from {sup 14}C-RDX, {sup 14}C-HMX and {sup 14}C-TATB were largely limited to {sup 14}CO{sub 2} and unextracted residue in the compost. Volatile and non-volatile {sup 14}C-degradates were found to result from {sup 14}C-PETN breakdown, but these compounds were not identified. {sup 14}C-diacetone alcohol concentrations were significantly reduced during composting. However, most of the radioactivity was volatilized from the compost as non-{sup 14}CO{sub 2} degradates or as {sup 14}C-diacetone alcohol. Pilot scale composts loaded with explosives contaminated soil at 30% (W/W) with intermittent aeration were monitored over six weeks. Data from the pilot-scale study generally was in agreement with the laboratory studies. However, the {sup 14}C-labeled TATB degraded much faster than the unlabeled TATB. Some formulations of TATB may be more resistant to composting activity than others.

Doyle, R.C.; Kitchens, J.F.

1993-07-01T23:59:59.000Z

437

Ising spin glasses in the effective-interaction-approximation L. Turban and P. Guilmin  

E-Print Network [OSTI]

L-145 Ising spin glasses in the effective-interaction-approximation L. Turban and P. Guilmin d'Ising (± 1) sont obtenues dans l'approximation de l'interaction effective. Pour le réseau carré and (± 1)-Ising spin glasses. For the square lattice we recover the exact results of Harris Tc(~)/Tc(0) = 1

Paris-Sud XI, Université de

438

Effects of the boussinesq approximation on the results of strongly-buoyant plume calculations  

SciTech Connect (OSTI)

Nearly all mathematical models which are commonly used to predict the dispersion of chimney gases in the atmosphere or heated water discharges in the aquatic environment employ the so-called boussinesq approximation. It is part of this approximation that density variations appear solely in the buoyancy term of the momentum equation and are neglected in all other terms.

Schatzmann, M.; Policastro, A.J.

1984-01-01T23:59:59.000Z

439

On the approximability of positive influence dominating set in social networks  

Science Journals Connector (OSTI)

In social networks, there is a tendency for connected users to match each other's behaviors. Moreover, a user likely adopts a behavior, if a certain fraction of his family and friends follows that behavior. Identifying people who have the most influential ... Keywords: Approximation algorithm, Hardness of approximation, Information diffusion, Social networks

Thang N. Dinh; Yilin Shen; Dung T. Nguyen; My T. Thai

2014-04-01T23:59:59.000Z

440

Majorana CP Violation in Approximately µ- Symmetric Models with det(M) = 0  

Science Journals Connector (OSTI)

......research-article Articles B52 B54 Majorana CP Violation in Approximately micro-tau Symmetric...259-1292, Japan We discuss effects of Majorana CP violation in a model-independent way for...Vol. 123, No. 4, April 2010 Majorana CP Violation in Approximately - Symmetric Models......

Teppei Baba; Masaki Yasuè

2010-04-01T23:59:59.000Z

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


441

A mesh-free convex approximation scheme for KohnSham density functional theory  

E-Print Network [OSTI]

A mesh-free convex approximation scheme for Kohn­Sham density functional theory Phanish: Convex approximation scheme Mesh-free methods Kohn­Sham Density functional theory Maximum-entropy a b s t r a c t Density functional theory developed by Hohenberg, Kohn and Sham is a widely accepted

Ortiz, Michael

442

Double-hybrid density-functional theory with meta-generalized-gradient approximations  

E-Print Network [OSTI]

Double-hybrid density-functional theory with meta-generalized-gradient approximations Sidi Ould-parameter double-hybrid density-functional theory [K. Sharkas, J. Toulouse, and A. Savin, J. Chem. Phys. 134 of the most accurate approximations for electronic-structure calculations within density- functional theory

Paris-Sud XI, Université de

443

Approximation using scattered shifts of a multivariate Ronald DeVore and Amos Ron  

E-Print Network [OSTI]

Approximation using scattered shifts of a multivariate function # Ronald DeVore and Amos Ron February 17, 2008 Abstract The approximation of a general d­variate function f by the shifts #(· - #), # # # # R d , of a fixed function # occurs in many applications such as data fit­ ting, neural networks

Liblit, Ben

444

Beam Propagation Method Using a [(p -1)/p] Pade Approximant of the Propagator  

E-Print Network [OSTI]

propagation method (BPM) is developed based on a direct approximation to the propagator using the [(p - 1)/p of the BPM. 1 Introduction The beam propagation method (BPM)1­4 is widely used in numerical simulation, the governing equation is a scalar Helmholtz equation. The BPM relies on approximating the Helmholtz equation

Lu, Ya Yan

445

Approximation Power of Re nable Vectors of Functions y Rong-Qing Jia and Qingtang Jiang  

E-Print Network [OSTI]

of functions in a compact form, which can be easily applied to concrete problems. Let IR denote the set of real ; : : : ; #30; r ) T be an r #2; 1 vector of compactly supported functions in L p (IR s ) (1 #20; p #20; 1;) and describe approximation schemes that achieve the optimal approximation order. We also give a self

Jiang, Qingtang

446

A Time--Dependent Born--Oppenheimer Approximation with Exponentially Small Error Estimates  

E-Print Network [OSTI]

A Time--Dependent Born--Oppenheimer Approximation with Exponentially Small Error Estimates George A accurate time--dependent Born-- Oppenheimer approximation for molecular quantum mechanics. We study is the usual Born--Oppenheimer expansion parameter ffl, where ffl 4 is the ratio of the electron mass divided

447

The AC Stark E#ect, Time--Dependent Born--Oppenheimer Approximation, and  

E-Print Network [OSTI]

The AC Stark E#ect, Time--Dependent Born--Oppenheimer Approximation, and Franck--Condon Factors by a classical oscillatory electric field, and we employ the Born--Oppenheimer approximation for the molecule. We-- Condon factors that we compute explicitly to leading order in the Born--Oppenheimer parameter. We also

Rousse, Vidian

448

A Time--Independent Born--Oppenheimer Approximation with Exponentially Accurate Error Estimates  

E-Print Network [OSTI]

A Time--Independent Born--Oppenheimer Approximation with Exponentially Accurate Error Estimates, we construct quasimodes that are exponentially accurate in the square of the Born--Oppenheimer that governs the approximation is the usual Born--Oppenheimer parameter #, where # 4 is the electron mass

449

ROBUST VIDEO RESTORATION BY JOINT SPARSE AND LOW RANK MATRIX APPROXIMATION  

E-Print Network [OSTI]

ROBUST VIDEO RESTORATION BY JOINT SPARSE AND LOW RANK MATRIX APPROXIMATION HUI JI, SIBIN HUANG, ZUOWEI SHEN, AND YUHONG XU Abstract. This paper presents a new video restoration scheme based domain, we formulate the video restoration problem as a joint sparse and low-rank matrix approximation

Shen, Zuowei

450

Gaussian approximation for finitely extensible bead-spring chains with hydrodynamic interaction  

E-Print Network [OSTI]

The Gaussian Approximation, proposed originally by Ottinger [J. Chem. Phys., 90 (1) : 463-473, 1989] to account for the influence of fluctuations in hydrodynamic interactions in Rouse chains, is adapted here to derive a new mean-field approximation for the FENE spring force. This "FENE-PG" force law approximately accounts for spring-force fluctuations, which are neglected in the widely used FENE-P approximation. The Gaussian Approximation for hydrodynamic interactions is combined with the FENE-P and FENE-PG spring force approximations to obtain approximate models for finitely-extensible bead-spring chains with hydrodynamic interactions. The closed set of ODE's governing the evolution of the second-moments of the configurational probability distribution in the approximate models are used to generate predictions of rheological properties in steady and unsteady shear and uniaxial extensional flows, which are found to be in good agreement with the exact results obtained with Brownian dynamics simulations. In particular, predictions of coil-stretch hysteresis are in quantitative agreement with simulations' results. Additional simplifying diagonalization-of-normal-modes assumptions are found to lead to considerable savings in computation time, without significant loss in accuracy.

R. Prabhakar; J. Ravi Prakash

2006-02-07T23:59:59.000Z

451

HYDRODYNAMIC LIMITS FOR KINETIC EQUATIONS AND THE DIFFUSIVE APPROXIMATION OF RADIATIVE  

E-Print Network [OSTI]

HYDRODYNAMIC LIMITS FOR KINETIC EQUATIONS AND THE DIFFUSIVE APPROXIMATION OF RADIATIVE TRANSPORT . The radiative transport equations, satisfied by the Wigner function for random acoustic waves, present#usive approximation of the radiative transport equation. 1. Introduction We consider a class of kinetic models

Tzavaras, Athanasios E.

452

APPROXIMATE HAMILTON DECOMPOSITIONS OF RANDOM FIACHRA KNOX, DANIELA KUHN AND DERYK OSTHUS  

E-Print Network [OSTI]

APPROXIMATE HAMILTON DECOMPOSITIONS OF RANDOM GRAPHS FIACHRA KNOX, DANIELA K¨UHN AND DERYK OSTHUS Abstract. We show that if pn log n the binomial random graph Gn,p has an approximate Hamilton decomposition. More precisely, we show that in this range Gn,p contains a set of edge-disjoint Hamilton cycles

Kühn, Daniela

453

IEEE TRANSACTIONS ON INFORMATION THEORY, VOL. 43, NO. 3, MAY 1997 903 Decision Region Approximation by  

E-Print Network [OSTI]

IEEE TRANSACTIONS ON INFORMATION THEORY, VOL. 43, NO. 3, MAY 1997 903 Decision Region Approximation, Senior Member, IEEE Abstract--We give degree of approximation results for decision regions which r, where r can be any number in the open interval (0; 1). Index Terms--Classification, decision

Blackmore, Kim

454

Approximation by complex Bernstein-Schurer and Kantorovich-Schurer polynomials in compact disks  

Science Journals Connector (OSTI)

In this paper, the order of simultaneous approximation and Voronovskaja-type results with quantitative estimate for complex Bernstein-Schurer and Kantorovich-Schurer polynomials attached to analytic functions on compact disks are obtained. In this way, ... Keywords: Complex Bernstein-Schurer and Kantorovich-Schurer polynomials, Simultaneous approximation, Voronovskaja-type result

George A. Anastassiou; Sorin G. Gal

2009-08-01T23:59:59.000Z

455

Relativistic impulse-approximation calculation of p-bar-nucleus elastic scattering  

SciTech Connect (OSTI)

The first calculations of p-bar-nucleus elastic scattering using the relativistic impulse approximation are presented and compared with the recent 46.8-MeV p-bar-/sup 12/C elastic scattering data. The calculated cross sections agree well with the data. The differences between relativistic and nonrelativistic impulse approximation calculations using the same input are small.

Clark, B.C.; Hama, S.; McNeil, J.A.; Mercer, R.L.; Ray, L.; Serot, B.D.; Sparrow, D.A.; Stricker-Bauer, K.

1984-10-08T23:59:59.000Z

456

APPLICATION OF SYMBOLIC PIECEWISE AGGREGATE APPROXIMATION (PAA) ANALYSIS TO ECG SIGNALS  

E-Print Network [OSTI]

APPLICATION OF SYMBOLIC PIECEWISE AGGREGATE APPROXIMATION (PAA) ANALYSIS TO ECG SIGNALS Burcu) with Piecewise Aggregate Approximation (PAA). The same ECG series is symbolized first by PLA and then PAA. Coarsing the series by PLA proved to be more problematic than PAA. At coarser scales, details are lost

Kumova, Bora

457

Semi-analytic approximations for production of atmospheric muons and neutrinos  

E-Print Network [OSTI]

Simple approximations for fluxes of atmospheric muons and muon neutrinos are developed which display explicitly how the fluxes depend on primary cosmic ray energy and on features of pion production. For energies of approximately 10 GeV and above the results are sufficiently accurate to calculate response functions and to use for estimates of systematic uncertainties.

Thomas K. Gaisser

2001-04-19T23:59:59.000Z

458

A Tight Approximation for an EOQ Model with Supply Disruptions Lawrence V. Snyder  

E-Print Network [OSTI]

, supply disruptions, EOQ, approximations, power-of-two policies 1 Introduction Despite the carefulA Tight Approximation for an EOQ Model with Supply Disruptions Lawrence V. Snyder Dept. of Industrial and Systems Engineering Lehigh University 200 West Packer Ave., Mohler Lab Bethlehem, PA, 18015

Snyder, Larry

459

The Approximation of Outage Probability and the Trade-off between Capacity and Diversity for the  

E-Print Network [OSTI]

line channel model in [5]) at high SNR, and give approximations of the outage probability at lowThe Approximation of Outage Probability and the Trade-off between Capacity and Diversity of the equivalent FIR channel filter. The error probability is bounded by the outage probability and the error

Scharf, Louis

460

Compound Poisson approximation in systems reliability A.D. Barbour, University of Zurich,  

E-Print Network [OSTI]

in clusters, W may be better approximated by a compound Poisson distribution, and the reliability IP[W = 0Compound Poisson approximation in systems reliability A.D. Barbour, University of Z¨urich, Ourania `local' formulation of the Stein-Chen method is applied to problems in reliability theory. Bounds

Barbour, Andrew

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


461

Luxottica Group is a leader in premium, luxury and sports eyewear with approximately 7,000 optical and sun retail stores in North America, Asia-Pacific, China, South Africa, Latin America and Europe, and a  

E-Print Network [OSTI]

with approximately 7,000 optical and sun retail stores in North America, Asia-Pacific, China, South Africa, Latin America and Europe, and a strong, well-balanced brand portfolio. Owned brands include Ray-Ban, the world markets, including LensCrafters, Pearle Vision and ILORI in North America, OPSM and Laubman & Pank in Asia

Schettini, Raimondo

462

Born-Oppenheimer approximation for open quantum systems within the quantum trajectory approach  

SciTech Connect (OSTI)

Using the quantum trajectory approach, we extend the Born-Oppenheimer (BO) approximation from closed to open quantum systems, where the open quantum system is described by a master equation in Lindblad form. The BO approximation is defined and the validity condition is derived. We find that the dissipation in fast variables improves the BO approximation, unlike the dissipation in slow variables. A detailed comparison is presented between this extension and our previous approximation based on the effective Hamiltonian approach [X. L. Huang and X. X. Yi, Phys. Rev. A 80, 032108 (2009)]. Several additional features and advantages are analyzed, which show that the two approximations are complementary to each other. Two examples are described to illustrate our method.

Huang, X. L.; Wu, S. L.; Wang, L. C.; Yi, X. X. [School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024 (China)

2010-05-15T23:59:59.000Z

463

Born-Oppenheimer approximation for open quantum systems within the quantum trajectory approach  

E-Print Network [OSTI]

Based on the quantum trajectory approach, we extend the Born-Oppenheimer (BO) approximation from closed quantum system to open quantum system, where the open quantum system is described by a master equation in Lindblad form. The BO approximation is defined and the validity condition is derived. We find that the dissipation in fast variables benefits the BO approximation that is different from the dissipation in slow variables. A detailed comparison between this extension and our previous approximation (that is based on the effective Hamiltonian approach, see X. L. Huang and X. X. Yi, Phys. Rev. A 80, 032108 (2009)) is presented. Several new features and advantages are analyzed, which show that the two approximations are complementary to each other. Two examples are taken to illustrate our method.

X. L. Huang; S. L. Wu; L. C. Wang; X. X. Yi

2010-04-17T23:59:59.000Z

464

E-Print Network 3.0 - alginate scaffold including Sample Search...  

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

created through a three step process which included: treatment... ; and exposure to a CaCl2 to crosslink the alginate sheets. Process variables included volume and concentra-...

465

E-Print Network 3.0 - actinides including cm Sample Search Results  

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

Summary: of waste actinides. Such damage can be studied by many techniques, including heavy-ionfast neutron... were presented and proposed, including; Fundamental studies...

466

Including screening in van der Waals corrected density functional theory calculations: The case of atoms and small molecules physisorbed on graphene  

SciTech Connect (OSTI)

The Density Functional Theory (DFT)/van der Waals-Quantum Harmonic Oscillator-Wannier function (vdW-QHO-WF) method, recently developed to include the vdW interactions in approximated DFT by combining the quantum harmonic oscillator model with the maximally localized Wannier function technique, is applied to the cases of atoms and small molecules (X=Ar, CO, H{sub 2}, H{sub 2}O) weakly interacting with benzene and with the ideal planar graphene surface. Comparison is also presented with the results obtained by other DFT vdW-corrected schemes, including PBE+D, vdW-DF, vdW-DF2, rVV10, and by the simpler Local Density Approximation (LDA) and semilocal generalized gradient approximation approaches. While for the X-benzene systems all the considered vdW-corrected schemes perform reasonably well, it turns out that an accurate description of the X-graphene interaction requires a proper treatment of many-body contributions and of short-range screening effects, as demonstrated by adopting an improved version of the DFT/vdW-QHO-WF method. We also comment on the widespread attitude of relying on LDA to get a rough description of weakly interacting systems.

Silvestrelli, Pier Luigi; Ambrosetti, Alberto [Dipartimento di Fisica e Astronomia, Università di Padova, via Marzolo 8, I–35131 Padova, Italy and DEMOCRITOS National Simulation Center of the Italian Istituto Officina dei Materiali (IOM) of the Italian National Research Council (CNR), Trieste (Italy)] [Dipartimento di Fisica e Astronomia, Università di Padova, via Marzolo 8, I–35131 Padova, Italy and DEMOCRITOS National Simulation Center of the Italian Istituto Officina dei Materiali (IOM) of the Italian National Research Council (CNR), Trieste (Italy)

2014-03-28T23:59:59.000Z

467

Common Data Set 2011-2012 J Column heading for CIP categories to include now reads: CIP 2010 Categories to Include  

E-Print Network [OSTI]

Common Data Set 2011-2012 J Column heading for CIP categories to include now reads: CIP 2010 Categories to Include J CIP category 3 description now reads: Natural resources and conservation J CIP category 5 description now reads: Area, ethnic, and gender studies J CIP category 16 description now reads

468

Atomic and Molecular Quantum Theory Course Number: C561 23 The Born-Oppenheimer approximation, the Many Electron  

E-Print Network [OSTI]

Atomic and Molecular Quantum Theory Course Number: C561 23 The Born-Oppenheimer approximation are required. One powerful approximation is called the Born-Oppenheimer approximation. (It does have some limitations and we will discuss these as well.) The Born-Oppenheimer approximation assumes that the nuclei

Iyengar, Srinivasan S.

469

Validity of several approximations for the turbulent buoyant jet in a stagnant neutrally-stratified ambient  

SciTech Connect (OSTI)

A series of approximations are usually made in deriving integral model equations for the dispersion of a round turbulent buoyant jet into a stagnant neutrally-stratified ambient fluid. The magnitudes of differences in model predictions caused by making four of these approximations are calculated as a function of the initial densimetric Froude number and the initial relative density difference. The four approximations studied are (1) the Boussinesq approximation, (2) the use of a common Gaussian width for both mean axial velocity and mean temperature (or concentration) excess, (3) the neglect of fluctuation-correlation terms, and (4) the assumption of a linear relationship between excess density and excess temperature (or concentration). The four approximations are studied singly and then cumulatively as the predictions of the two models, one with and one without all approximations, are compared to seven low Froude number data cases. Results show that the Boussinesq approximation produces percentage differences in predictions which are about half of the initial relative density difference expressed in percentage. Use of a common Gaussian width for velocity and temperature produces differences from 6% to 30% depending on the entrainment assumption used. Fluctuation correlation effects rarely exceed 8%. Lastly, at Froude numbers below about 10 the correct nonlinear equation of state must often be used for heated waste jets to acheive accurate results, and the correct air equation of state may also be needed for low Froude number heated air jets, depending on the initial diameter and velocity.

Ponce, T.C.

1982-01-01T23:59:59.000Z

470

Stochastic quasi-steady state approximations for asymptotic solutions of the chemical master equation  

SciTech Connect (OSTI)

In this paper, we propose two methods to carry out the quasi-steady state approximation in stochastic models of enzyme catalytic regulation, based on WKB asymptotics of the chemical master equation or of the corresponding partial differential equation for the generating function. The first of the methods we propose involves the development of multiscale generalisation of a WKB approximation of the solution of the master equation, where the separation of time scales is made explicit which allows us to apply the quasi-steady state approximation in a straightforward manner. To the lowest order, the multi-scale WKB method provides a quasi-steady state, Gaussian approximation of the probability distribution. The second method is based on the Hamilton-Jacobi representation of the stochastic process where, as predicted by large deviation theory, the solution of the partial differential equation for the corresponding characteristic function is given in terms of an effective action functional. The optimal transition paths between two states are then given by those paths that maximise the effective action. Such paths are the solutions of the Hamilton equations for the Hamiltonian associated to the effective action functional. The quasi-steady state approximation is applied to the Hamilton equations thus providing an approximation to the optimal transition paths and the transition time between two states. Using this approximation we predict that, unlike the mean-field quasi-steady approximation result, the rate of enzyme catalysis depends explicitly on the initial number of enzyme molecules. The accuracy and validity of our approximated results as well as that of our predictions regarding the behaviour of the stochastic enzyme catalytic models are verified by direct simulation of the stochastic model using Gillespie stochastic simulation algorithm.

Alarcón, Tomás [Centre de Recerca Matemàtica, Edifici C, Campus de Bellaterra, 08193 Bellaterra (Barcelona) (Spain) [Centre de Recerca Matemàtica, Edifici C, Campus de Bellaterra, 08193 Bellaterra (Barcelona) (Spain); Departament de Matemàtiques, Universitat Atonòma de Barcelona, 08193 Bellaterra (Barcelona) (Spain)

2014-05-14T23:59:59.000Z

471

Saudi arabia to inject funds into ITFC  

E-Print Network [OSTI]

"Saudi Arabian will infuse the Islamic Trade Financing Corporation (ITFC) with SR112.5 million ($30 million). The money will come from the General Investment fund." (1 page)

2007-01-01T23:59:59.000Z

472

Composite materials and bodies including silicon carbide and titanium diboride and methods of forming same  

DOE Patents [OSTI]

Methods of forming composite materials include coating particles of titanium dioxide with a substance including boron (e.g., boron carbide) and a substance including carbon, and reacting the titanium dioxide with the substance including boron and the substance including carbon to form titanium diboride. The methods may be used to form ceramic composite bodies and materials, such as, for example, a ceramic composite body or material including silicon carbide and titanium diboride. Such bodies and materials may be used as armor bodies and armor materials. Such methods may include forming a green body and sintering the green body to a desirable final density. Green bodies formed in accordance with such methods may include particles comprising titanium dioxide and a coating at least partially covering exterior surfaces thereof, the coating comprising a substance including boron (e.g., boron carbide) and a substance including carbon.

Lillo, Thomas M.; Chu, Henry S.; Harrison, William M.; Bailey, Derek

2013-01-22T23:59:59.000Z

473

AdS/QCD and Light Front Holography: A New Approximation to QCD  

SciTech Connect (OSTI)

The combination of Anti-de Sitter space (AdS) methods with light-front holography leads to a semi-classical first approximation to the spectrum and wavefunctions of meson and baryon light-quark bound states. Starting from the bound-state Hamiltonian equation of motion in QCD, we derive relativistic light-front wave equations in terms of an invariant impact variable {zeta} which measures the separation of the quark and gluonic constituents within the hadron at equal light-front time. These equations of motion in physical space-time are equivalent to the equations of motion which describe the propagation of spin-J modes in anti-de Sitter (AdS) space. Its eigenvalues give the hadronic spectrum, and its eigenmodes represent the probability distribution of the hadronic constituents at a given scale. Applications to the light meson and baryon spectra are presented. The predicted meson spectrum has a string-theory Regge form M{sup 2} = 4{kappa}{sup 2}(n+L+S/2); i.e., the square of the eigenmass is linear in both L and n, where n counts the number of nodes of the wavefunction in the radial variable {zeta}. The space-like pion form factor is also well reproduced. One thus obtains a remarkable connection between the description of hadronic modes in AdS space and the Hamiltonian formulation of QCD in physical space-time quantized on the light-front at fixed light-front time {tau}. The model can be systematically improved by using its complete orthonormal solutions to diagonalize the full QCD light-front Hamiltonian or by applying the Lippmann-Schwinger method in order to systematically include the QCD interaction terms.

Brodsky, Stanley J.; de Teramond, Guy

2010-02-15T23:59:59.000Z

474

Transverse exchange energy in relativistic density-functional calculations: An alternative approximation  

Science Journals Connector (OSTI)

The large error of the local-density approximation for the transverse photon-electron or Breit interaction is analyzed, transforming the Breit interaction into a sum of terms suitable to be handled in a nonrelativistic formalism: the local approximation for each of these terms is built up and an alternative expression for the relativistic exchange energy is proposed. Calculations using this expression are made for atoms ranging throughout the periodic table and the results show a sharp improvement when compared to those obtained by the previous approximation.

Mauro Boero and Pietro Cortona

1994-02-01T23:59:59.000Z

475

New relativistic S-matrix results for scattering -- beyond the usual anomalous factors/beyond impulse approximation  

SciTech Connect (OSTI)

The relativistic second-order S-matrix elements for photon-atom scattering have been successfully calculated with numerical methods within the independent particle approximation (IPA). This permits an assessment of the validity of simpler approximate predictions which are commonly used and it offers the possibility of improved tabulations of theoretical predictions. A variety of unresolved issues remain, some associated with the relativistic theory, some with IPA. The systematic use of the second-order S-matrix in calculations of Rayleigh scattering from isolated atoms has led to significant progress in understanding this process and to a wide range of agreement with experiment. The energy and angular dependence of anomalous factors and the importance of relativistic, higher-multipole and bound-bound contributions in their calculation is better understood. However correlation effects must also be included to obtain predictions for the near-edge region, such extensions of the present S-matrix calculation have been discussed but few results are sofar available. Existing empirical approaches can be assessed in regard to their success in dealing with known IPA features. We have recently calculated the relativistic second-order S-matrix element for Compton scattering and have begun to try to understand this process in different regions. We can discuss when the more complete calculation confirms the standard Compton peak. In the softer part of the spectrum impulse approximation fails. There can be resonant Raman peaks, and in the soft-photon region the spectrum is infrared divergent, proportional to the photoeffect angular distribution. This means the traditional incoherent scattering factor is undefined in the absence of a low-energy detector efficiency cutoff.

Pratt, R.H.; Bergstrom, P.M. Jr. [Pittsburgh Univ., PA (United States). Dept. of Physics and Astronomy; Kissel, L. [Lawrence Livermore National Lab., CA (United States)]|[Pittsburgh Univ., PA (United States). Dept. of Physics and Astronomy

1993-08-01T23:59:59.000Z

476

E-Print Network 3.0 - approximation phys rev Sample Search Results  

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

12 Allan Peter Young List of Publications Summary: ;15. Spherical Approximation to an Ising Spin Glass (with B.W. Southern), J. Phys. C, 10, L79 (1977). 16... Model, J. Phys. C,...

477

THE NUMERICAL APPROXIMATION FOR THE INTEGRABILITY PROBLEM AND THE MEASURE OF WELFARE CHANGES, AND ITS APPLICATIONS  

E-Print Network [OSTI]

This dissertation mainly studied on numerical approximation methods as a solution of the integrability problem and the measure of welfare changes, and demonstrated how numerical algorithms can be applied in empirical studies ...

Lim, Sung Jin

2012-01-01T23:59:59.000Z

478

Efficient Approximate Value Iteration for Continuous Gaussian POMDPs Jur van den Berg1  

E-Print Network [OSTI]

Efficient Approximate Value Iteration for Continuous Gaussian POMDPs Jur van den Berg1 Sachin Patil2 Ron Alterovitz2 1 School of Computing, University of Utah, berg@cs.utah.edu. 2 Dept. of Computer

van den Berg, Jur

479

Effects of the Boussinesq Approximation on the Results of Strongly-Buoyant Plume Calculations  

Science Journals Connector (OSTI)

Nearly all mathematical models which are commonly used to predict the dispersion of chimney gases in the atmosphere or heated water discharges in the aquatic environment employ the so-called Boussinesq approximation. It is part of this ...

M. Schatzmann; A. J. Policastro

1984-01-01T23:59:59.000Z

480

Reduced Basis Approximation and a Posteriori Error Estimation for the Parametrized Unsteady Boussinesq Equations  

E-Print Network [OSTI]

In this paper we present reduced basis (RB) approximations and associated rigorous a posteriori error bounds for the parametrized unsteady Boussinesq equations. The essential ingredients are Galerkin projection onto a ...

Knezevic, David J.

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481

Approximating probability density functions in hybrid Bayesian networks with mixtures of truncated exponentials  

E-Print Network [OSTI]

be marginalized in closed form. This allows propagation to be done exactly using the Shenoy-Shafer architecture for computing marginals, with no restrictions on the construction of a join tree. This paper presents MTE potentials that approximate standard PDF...

Cobb, Barry R.; Shenoy, Prakash P.; Rumi, Rafael

2006-09-01T23:59:59.000Z

482

Approximate Marginalization of Absorption and Scattering in Fluorescence Diffuse Optical Tomography  

E-Print Network [OSTI]

In fluorescence diffuse optical tomography (fDOT), the reconstruction of the fluorophore concentration inside the target body is usually carried out using a normalized Born approximation model where the measured fluorescent emission data is scaled by measured excitation data. One of the benefits of the model is that it can tolerate inaccuracy in the absorption and scattering distributions that are used in the construction of the forward model to some extent. In this paper, we employ the recently proposed Bayesian approximation error approach to fDOT for compensating for the modeling errors caused by the inaccurately known optical properties of the target in combination with the normalized Born approximation model. The approach is evaluated using a simulated test case with different amount of error in the optical properties. The results show that the Bayesian approximation error approach improves the tolerance of fDOT imaging against modeling errors caused by inaccurately known absorption and scattering of the...

Mozumder, Meghdoot; Arridge, Simon; Kaipio, Jari P; d'Andrea, Cosimo; Kolehmainen, Ville

2015-01-01T23:59:59.000Z

483

Digital Ink Compression via Functional Approximation Vadim Mazalov and Stephen M. Watt  

E-Print Network [OSTI]

Digital Ink Compression via Functional Approximation Vadim Mazalov and Stephen M. Watt University of Western Ontario London, Ontario, Canada vmazalov@csd.uwo.ca, watt@csd.uwo.ca Abstract Representing digital

Watt, Stephen M.

484

The Born-Oppenheimer Approximation for Triatomic Molecules with Large Angular Momentum in Two Dimensions.  

E-Print Network [OSTI]

??We study the Born-Oppenheimer approximation for a symmetric linear triatomic molecule in two space dimensions. We compute energy levels up to errors of order ε5,… (more)

Bowman, Adam Shoresworth

2011-01-01T23:59:59.000Z

485

Brueckner Random Phase approximation, a microscopic description of particle-hole states  

Science Journals Connector (OSTI)

Excited states of finite nuclei are described in a selfconsistent Random Phase Approximation (RPA) starting from a realistic NN interaction like the Hamada-Johnston or Reid soft core potential. The expressions fo...

H. Müther; Y. R. Waghmare; Amand Faessler

1980-01-01T23:59:59.000Z

486

Local-potential approximation for the Brueckner G matrix and problem of optimally choosing model subspace  

Science Journals Connector (OSTI)

The validity of the local-potential approximation, which was proposed previously for the singlet-pairing problem in semi-infinite nuclear matter, is investigated in the Bethe-Goldstone equation for the Brueckner

M. Baldo; U. Lombardo; E. E. Saperstein; M. V. Zverev

2002-07-01T23:59:59.000Z

487

High-frequency approximations for edge scatter from surfaces of revolution  

Science Journals Connector (OSTI)

We consider the radar backscatter from a truncated surface of revolution viewed at axial incidence and derive a closed-form high-frequency (HF) approximation for the physical-optics...

Gordon, William B; Bilow, Henry J

1991-01-01T23:59:59.000Z

488

A fast algorithm for approximating the ground state energy on a quantum computer Anargyros Papageorgiou,1,  

E-Print Network [OSTI]

, Columbia University, New York, NY 10027, USA. (Dated: May 11, 2011) Estimating the ground state energy#12;A fast algorithm for approximating the ground state energy on a quantum computer Anargyros

489

An approximate global solution of Einstein's equations for a finite body  

E-Print Network [OSTI]

We obtain an approximate global stationary and axisymmetric solution of Einstein's equations which can be considered as a simple star model: a self-gravitating perfect fluid ball with constant mass density rotating in rigid motion. Using the post-Minkowskian formalism (weak-field approximation) and considering rotation as a perturbation (slow-rotation approximation), we find approximate interior and exterior (asymptotically flat) solutions to this problem in harmonic and quo-harmonic coordinates. In both cases, interior and exterior solutions are matched, in the sense of Lichnerowicz, on the surface of zero pressure to obtain a global solution. The resulting metric depends on three arbitrary constants: mass density, rotational velocity and the star radius at the non-rotation limit. The mass, angular momentum, quadrupole moment and other constants of the exterior metric are determined by these three parameters. It is easy to show that this type of fluid cannot be a source of the Kerr metric

J. A. Cabezas; J. Martin-Martin; A. Molina; E. Ruiz

2006-11-02T23:59:59.000Z

490

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 Gómez

2014-01-01T23:59:59.000Z

491

Born-Oppenheimer-type Approximations for Degenerate Potentials: Recent Results and a Survey on the Area  

Science Journals Connector (OSTI)

Then, without assumptions on the limit of f..., we give a sharp estimate of the low eigenvalnes, using a Born Oppenheimer approximation. With a refined approach we localize...h.

Françoise Truc

2009-01-01T23:59:59.000Z

492

On the Born-Oppenheimer approximation of wave operators in molecular scattering theory  

Science Journals Connector (OSTI)

In this paper we study the diatomic molecular scattering by reducing the number of particles through Born-Oppenheimer approximation. Under a non-trapping assumption on ... -adiabatic corrections to the adiabatic ...

M. Klein; A. Martinez; X. P. Wang

493

Approximation de Born-Oppenheimer en présence de (presque) croisement de surfaces d'énergie.  

E-Print Network [OSTI]

??L'approximation de Born-Oppenheimer consiste à traiter de manière semi-classique l'équation de Schrödinger associée à une molécule en utilisant la petitesse du rapport de masse entre… (more)

ROUSSE, Vidian

494

ON A SORPTION-COAGULATION EQUATION: STATEMENT, EXISTENCE AND NUMERICAL APPROXIMATION  

E-Print Network [OSTI]

ON A SORPTION-COAGULATION EQUATION: STATEMENT, EXISTENCE AND NUMERICAL APPROXIMATION ERWAN HINGANT AND MAURICIO SEP´ULVEDA Abstract. This paper is devoted to the design and the mathematics of a new sorption

Sepúlveda, Mauricio

495

Periodically specified problems: An exponential complexity gap between exact and approximate solutions  

SciTech Connect (OSTI)

We study both the complexity and approximability of various graph and combinatorial problems specified using two dimensional narrow periodic specifications (see [CM93, HW92, KMW67, KO91, Or84b, Wa93]). The following two general kinds of results are presented. (1) We prove that a number of natural graph and combinatorial problems are NEXPTIME- or EXPSPACE-complete when instances are so specified; (2) In contrast, we prove that the optimization versions of several of these NEXPTIME-, EXPSPACE-complete problems have polynomial time approximation algorithms with constant performance guarantees. Moreover, some of these problems even have polynomial time approximation schemes. We also sketch how our NEXPTIME-hardness results can be used to prove analogous NEXPTIME-hardness results for problems specified using other kinds of succinct specification languages. Our results provide the first natural problems for which there is a proven exponential (and possibly doubly exponential) gap between the complexities of finding exact and approximate solutions.

Hunt, H.B. III; Rosenkrantz, D.J.; Stearns, R.E.; Marathe, M.V.; Radhakrishnan, V. [Univ. at Albany, NY (United States). Dept. of Computer Science

1994-11-28T23:59:59.000Z

496

The development of an approximate dynamic analysis of insulating glass units  

E-Print Network [OSTI]

their dynamic response. The formulation of this approximate dynamic analysis of IG units is achieved by modeling the unit with two equivalent single degree of freedom systems consisting of equivalent masses, equivalent structural stiffnesses, equivalent forces...

Sequeira, Miguel Angel

1995-01-01T23:59:59.000Z

497

EA-1915: Conveyance of Approximately 1,641 Acres of Unimproved Land to the  

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

5: Conveyance of Approximately 1,641 Acres of Unimproved Land 5: Conveyance of Approximately 1,641 Acres of Unimproved Land to the Tri-City Development Council, the Local Community Reuse Organization, Richland, WA EA-1915: Conveyance of Approximately 1,641 Acres of Unimproved Land to the Tri-City Development Council, the Local Community Reuse Organization, Richland, WA Summary This EA will evaluate the environmental impacts of conveyance of approximately 1,641 acres of unimproved land at DOE's Hanford Site, Richland, Washington to the Tri-City Development Council, the local community reuse organization. Public Comment Opportunities None available at this time. Documents Available for Download September 19, 2012 EA-1915: Notice of Intent to Prepare an Environmental Assessment and Notice of Potential Floodplain and Wetland Involvement

498

Calculation of absorption spectra involving multiple excited states: Approximate methods based on the mixed quantum classical Liouville equation  

SciTech Connect (OSTI)

We investigate the calculation of absorption spectra based on the mixed quantum classical Liouville equation (MQCL) methods. It has been shown previously that, for a single excited state, the averaged classical dynamics approach to calculate the linear and nonlinear spectroscopy can be derived using the MQCL formalism. This work focuses on problems involving multiple coupled excited state surfaces, such as in molecular aggregates and in the cases of coupled electronic states. A new equation of motion to calculate the dipole-dipole correlation functions within the MQCL formalism is first presented. Two approximate methods are then proposed to solve the resulted equations of motion. The first approximation results in a mean field approach, where the nuclear dynamics is governed by averaged forces depending on the instantaneous electronic states. A modification to the mean field approach based on first order moment expansion is also proposed. Numerical examples including calculation of the absorption spectra of Frenkel exciton models of molecular aggregates, and the pyrazine molecule are presented.

Bai, Shuming; Xie, Weiwei; Zhu, Lili; Shi, Qiang, E-mail: qshi@iccas.ac.cn [Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun, Beijing 100190 (China)] [Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun, Beijing 100190 (China)

2014-02-28T23:59:59.000Z

499

Quantum Hasimoto transformation and nonlinear waves on a superfluid vortex filament under the quantum local induction approximation  

E-Print Network [OSTI]

The Hasimoto transformation between the classical LIA (local induction approximation, a model approximating the motion of a thin vortex filament) and the nonlinear Schr\\"odinger equation (NLS) has proven very useful in the past, since it allows one to construct new solutions to the LIA once a solution to the NLS is known. In the present paper, the quantum form of the LIA (which includes mutual friction effects) is put into correspondence with a type of complex nonlinear dispersive partial differential equation (PDE) with cubic nonlinearity (similar in form to a Ginsburg-Landau equation, with additional nonlinear terms). Transforming the quantum LIA in such a way enables one to obtain quantum vortex filament solutions once solutions to this dispersive PDE are known. From our quantum Hasimoto transformation, we determine the form and behavior of Stokes waves and a standing 1-soliton solution under normal and binormal friction effects. The soliton solution on a quantum vortex filament is a natural generalization of the classical 1-soliton solution constructed mathematically by Hasimoto (which motivated subsequent real-world experiments). The quantum Hasimoto transformation is useful when normal fluid velocity is relatively weak, so for the case where the normal fluid velocity is dominant we resort to other approaches. We consider the dynamics of the tangent vector to the vortex filament directly from the quantum LIA, and this approach, while less elegant than the quantum Hasimoto transformation, enables us to study waves primarily driven by the normal fluid velocity.

Robert A. Van Gorder

2014-11-19T23:59:59.000Z

500

Boussinesq-Approximation (Boussinesq approximation)  

Science Journals Connector (OSTI)

Es handelt sich um eine mathematische Näherung bei der Beschreibung von Strömungen, die durch Auftriebseffekte hervorgerufen oder beeinflußt werden (natürliche bzw. gemischte Konvektion). Dabei wird unterstell...

Dr. Ing. Heinz Herwig

2000-01-01T23:59:59.000Z