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Note: This page contains sample records for the topic "optimal gap width" from the National Library of EnergyBeta (NLEBeta).
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they are not comprehensive nor are they the most current set.
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1

LS-266 OPTIMIZATION OF FOUR-BUTTON BEAM POSITION MONITOR CONFIGURATION FOR SMALL-GAP VACUUM CHAMBERS  

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

LS-266 LS-266 OPTIMIZATION OF FOUR-BUTTON BEAM POSITION MONITOR CONFIGURATION FOR SMALL-GAP VACUUM CHAMBERS S. H. Kim March 27, 1998 Summary - Induced charges on a four-button beam position monitor (BPM) system attached on a beam chamber of narrow rectangular cross sections are calculated as a 2-D electrostatic problem of image charges. The calculation shows that for a narrow chamber of width/height (2w/2h) >> 1, over 90% of the induced charges are distributed within a distance of 2h from the charged beam position in the direction of the chamber width. Therefore, a four-button system with a button diameter of (2 ~ 2.5)h and no button offset from the beam position is the most efficient configuration. The four-button BPMs used for 8-mm and 5-mm chambers in the APS have relatively low sensitivities because the button locations are outside

2

Optimization Online - Information Gap Decision Theory Based OPF ...  

E-Print Network (OSTI)

Jan 3, 2015 ... Abstract: A method for solving the optimal power flow (OPF) problem including HVDC connected offshore wind farms is presented in this paper.

rabiee abbas

2015-01-03T23:59:59.000Z

3

Metallic photonic-band-gap filament architectures for optimized incandescent lighting Sajeev John and Rongzhou Wang  

E-Print Network (OSTI)

Metallic photonic-band-gap filament architectures for optimized incandescent lighting Sajeev John occur 3,4 . Tra- ditionally incandescent lighting filaments, despite being driven from equilibrium the blackbody spectrum. This suggests the pos- sibility of higher efficiency incandescent lighting, through

John, Sajeev

4

Predicting New TiO2 Phases with Low Band Gaps by a Multiobjective Global Optimization Approach  

E-Print Network (OSTI)

stable. This is equivalent to a global optimization problem of a biobjective function, i.e., total energyPredicting New TiO2 Phases with Low Band Gaps by a Multiobjective Global Optimization Approach Hou as a novel global optimization algorithm to predict new polymorphs of bulk TiO2 with better optical

Gong, Xingao

5

Bradbury-Nielsen gate electrode potential switching modes optimizing the ion packet time width in an ion mobility spectrometer  

Science Journals Connector (OSTI)

The methods minimizing duration of the output pulse of the ion mobility spectrometer at its maximum intensity were proposed in order to increase the instrument resolution. The optimal duration of the enabling pul...

Igor V. Kurnin; Nikolai V. Krasnov…

2014-06-01T23:59:59.000Z

6

Design optimization of an out-of-plane gap-closing electrostatic Vibration Energy Harvester (VEH) with a limitation on the output voltage  

Science Journals Connector (OSTI)

This paper presents a simple analytical method to optimize the efficiency of an electrostatic out-of-plane gap-closing (OPGC) Vibration Energy Harvesters (VEH). For the first time the electrical and mechanical behaviours of the transducer are addressed ... Keywords: Electrostatic transduction, Energy conversion, MEMS, Microtechnology, Power generation, Vibration energy harvesting/scavenging

R. Guillemet; P. Basset; D. Galayko; T. Bourouina

2012-04-01T23:59:59.000Z

7

Fiber optic gap gauge  

SciTech Connect

A lightweight, small size, high sensitivity gauge for indirectly measuring displacement or absolute gap width by measuring axial strain in an orthogonal direction to the displacement/gap width. The gap gauge includes a preferably titanium base having a central tension bar with springs connecting opposite ends of the tension bar to a pair of end connector bars, and an elongated bow spring connected to the end connector bars with a middle section bowed away from the base to define a gap. The bow spring is capable of producing an axial strain in the base proportional to a displacement of the middle section in a direction orthogonal to the base. And a strain sensor, such as a Fabry-Perot interferometer strain sensor, is connected to measure the axial strain in the base, so that the displacement of the middle section may be indirectly determined from the measurement of the axial strain in the base.

Wood, Billy E. (Livermore, CA); Groves, Scott E. (Brentwood, CA); Larsen, Greg J. (Brentwood, CA); Sanchez, Roberto J. (Pleasanton, CA)

2006-11-14T23:59:59.000Z

8

OPTIMIZATION OF GRADED BAND GAP CdHgTe SOLAR CELLS A. BOUAZZI (*), Y. MARFAING and J. MIMILA-ARROYO  

E-Print Network (OSTI)

limited to 6 % in Cu2Te/CdTe junctions [4, 5], 7.9 % in CdS/CdTe heterojunctions and 6 % in homojunc with uniform doping followed by a base region with uni- form gap and doping. Our goal is to find the optimum

Boyer, Edmond

9

Pneumatic gap sensor and method  

DOE Patents (OSTI)

An apparatus and method for monitoring and maintaining a predetermined width in the gap between a casting nozzle and a casting wheel, wherein the gap is monitored by means of at least one pneumatic gap sensor. The pneumatic gap sensor is mounted on the casting nozzle in proximity to the casting surface and is connected by means of a tube to a regulator and a transducer. The regulator provides a flow of gas through a restictor to the pneumatic gap sensor, and the transducer translates the changes in the gas pressure caused by the proximity of the casting wheel to the pneumatic gap sensor outlet into a signal intelligible to a control device. The relative positions of the casting nozzle and casting wheel can thereby be selectively adjusted to continually maintain a predetermined distance between their adjacent surfaces. The apparatus and method enables accurate monitoring of the actual casting gap in a simple and reliable manner resistant to the extreme temperatures and otherwise hostile casting environment.

Bagdal, Karl T. (Middletown, OH); King, Edward L. (Trenton, OH); Follstaedt, Donald W. (Middletown, OH)

1992-01-01T23:59:59.000Z

10

Calibration curves for some standard Gap Tests  

SciTech Connect

The relative shock sensitivities of explosive compositions are commonly assessed using a family of experiments that can be described by the generic term ''Gap Test.'' Gap tests include a donor charge, a test sample, and a spacer, or gap, between two explosives charges. The donor charge, gap material, and test dimensions are held constant within each different version of the gap test. The thickness of the gap is then varied to find the value at which 50% of the test samples will detonate. The gap tests measure the ease with a high-order detonation can be established in the test explosive, or the ''detonability,'' of the explosive. Test results are best reported in terms of the gap thickness at the 50% point. It is also useful to define the shock pressure transmitted into the test sample at the detonation threshold. This requires calibrating the gap test in terms of shock pressure in the gap as a function of the gap thickness. It also requires a knowledge of the shock Hugoniot of the sample explosive. We used the 2DE reactive hydrodynamic code with Forest Fire burn rates for the donor explosives to calculate calibration curves for several gap tests. The model calculations give pressure and particle velocity on the centerline of the experimental set-up and provide information about the curvature and pulse width of the shock wave. 10 refs., 1 fig.

Bowman, A.L.; Sommer, S.C.

1989-01-01T23:59:59.000Z

11

Gas mixtures for spark gap closing switches  

DOE Patents (OSTI)

Gas mixtures for use in spark gap closing switches comprised of fluorocarbons and low molecular weight, inert buffer gases. To this can be added a third gas having a low ionization potential relative to the buffer gas. The gas mixtures presented possess properties that optimized the efficiency spark gap closing switches. 6 figs.

Christophorou, L.G.; McCorkle, D.L.; Hunter, S.R.

1987-02-20T23:59:59.000Z

12

Judith Gap Wind Farm | Open Energy Information  

Open Energy Info (EERE)

Gap Wind Farm Gap Wind Farm Jump to: navigation, search Name Judith Gap Wind Farm Facility Judith Gap Sector Wind energy Facility Type Commercial Scale Wind Facility Status In Service Owner Invenergy Developer Invenergy Energy Purchaser Northwestern Energy Location South of Judith Gap MT Coordinates 46.6005°, -109.749° 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":46.6005,"lon":-109.749,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

13

Buffalo Gap Wind Farm | Open Energy Information  

Open Energy Info (EERE)

Gap Wind Farm Gap Wind Farm Jump to: navigation, search Name Buffalo Gap Wind Farm Facility Buffalo Gap Sector Wind energy Facility Type Commercial Scale Wind Facility Status In Service Owner AES Developer AES Energy Purchaser Direct Energy Location TX Coordinates 32.310556°, -100.149167° 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":32.310556,"lon":-100.149167,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

14

Optimization Online - All Areas Submissions - January 2015  

E-Print Network (OSTI)

Information Gap Decision Theory Based OPF With HVDC Connected Wind Farms rabiee abbas, Alireza Soroudi, andrew keane. Combinatorial Optimization

15

Remarks on statistical errors in equivalent widths  

E-Print Network (OSTI)

Equivalent width measurements for rapid line variability in atomic spectral lines are degraded by increasing error bars with shorter exposure times. We derive an expression for the error of the line equivalent width $\\sigma(W_\\lambda)$ with respect to pure photon noise statistics and provide a correction value for previous calculations.

Klaus Vollmann; Thomas Eversberg

2006-07-03T23:59:59.000Z

16

Windy Gap Firming Project  

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

Infrastructure projects Interconnection OASIS OATT Windy Gap Firming Project, Final Environmental Impact Statement, DOEEIS-0370 (cooperating agency) Western's proposed...

17

Olene Gap Geothermal Project | Open Energy Information  

Open Energy Info (EERE)

Olene Gap Geothermal Project Olene Gap Geothermal Project Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Development Project: Olene Gap Geothermal Project Project Location Information Coordinates 42.1725°, -121.62083333333° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":42.1725,"lon":-121.62083333333,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

18

Property:Width (m) | Open Energy Information  

Open Energy Info (EERE)

Width (m) Width (m) Jump to: navigation, search Property Name Width (m) Property Type Number Pages using the property "Width (m)" Showing 25 pages using this property. (previous 25) (next 25) M MHK Technologies/Aegir Dynamo + 4.5 + MHK Technologies/AirWEC + 2.5 + MHK Technologies/CurrentStar + 30.5 + MHK Technologies/Deep Green + 12 + MHK Technologies/Deep water capable hydrokinetic turbine + 10 + MHK Technologies/ECO Auger + 4.877 + MHK Technologies/Electric Buoy + 10 + MHK Technologies/European Pico Pilot Plant + 14 + MHK Technologies/Evopod E35 + 4.5 + MHK Technologies/Float Wave Electric Power Station + 2.5 + MHK Technologies/Floating anchored OTEC plant + 60 + MHK Technologies/HyPEG + 50 + MHK Technologies/HydroGen 10 + 2 + MHK Technologies/Hydroflo + 5 +

19

The Widths of Nuclear Energy Levels  

Science Journals Connector (OSTI)

Neutron absorption measurements with Rh both as absorber and detector have been performed, in order to obtain information about the levels of the compound nucleus responsible for the 44? period of Rh. The absorption curves have been analyzed by assuming a single sharp resonance and taking into consideration the angular distribution of the neutrons emerging from the source and the absorption of the neutrons and the electrons in the detector. This analysis yields the values: (a) 6100×10-24 cm2 for the capture cross section at resonance; (b) 0.17 ev for the total width; (c) 1.6×10-3 ev for the neutron width.

J. H. Manley, H. H. Goldsmith, and Julian Schwinger

1939-01-01T23:59:59.000Z

20

Generation gaps in engineering?  

E-Print Network (OSTI)

There is much enthusiastic debate on the topic of generation gaps in the workplace today; what the generational differences are, how to address the apparent challenges, and if the generations themselves are even real. ...

Kim, David J. (David Jinwoo)

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "optimal gap width" 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

Method and apparatus for improved efficiency in a pulse-width-modulated alternating current motor drive  

DOE Patents (OSTI)

A scheme for optimizing the efficiency of an AC motor drive operated in a pulse-width-modulated mode provides that the modulation frequency of the power furnished to the motor is a function of commanded motor torque and is higher at lower torque requirements than at higher torque requirements. 6 figs.

Konrad, C.E.; Boothe, R.W.

1996-01-23T23:59:59.000Z

22

Method and apparatus for improved efficiency in a pulse-width-modulated alternating current motor drive  

DOE Patents (OSTI)

A scheme for optimizing the efficiency of an AC motor drive operated in a pulse-width-modulated mode provides that the modulation frequency of the power furnished to the motor is a function of commanded motor torque and is higher at lower torque requirements than at higher torque requirements.

Konrad, Charles E. (Roanoke, VA); Boothe, Richard W. (Roanoke, VA)

1996-01-01T23:59:59.000Z

23

Method and apparatus for improved efficiency in a pulse-width-modulated alternating current motor drive  

DOE Patents (OSTI)

A scheme for optimizing the efficiency of an AC motor drive operated in a pulse-width-modulated mode provides that the modulation frequency of the power furnished to the motor is a function of commanded motor torque and is higher at lower torque requirements than at higher torque requirements.

Konrad, Charles E. (Roanoke, VA); Boothe, Richard W. (Roanoke, VA)

1994-01-01T23:59:59.000Z

24

Windy Gap Firming Project  

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

Windy Gap Firming Project Windy Gap Firming Project Skip Navigation Links Transmission Functions Infrastructure projects Interconnection OASIS OATT Windy Gap Firming Project, Final Environmental Impact Statement, DOE/EIS-0370 (cooperating agency) Western's proposed action is to relocate approximately 3.8 miles of the existing Estes to Lyons 115-kilovolt transmission line, if the Chimney Hollow Reservoir alternative is constructed. The line would be moved outside the area proposed for the reservoir, and Western would ensure the new location would allow the agency to continue to operate and maintain it. Section 2.4.1.4 of the Final Environmental Impact Statement, Volume 1 provides more information on the transmission line relocation proposal. The U.S. Department of the Interior, Bureau of Reclamation is the Lead Agency for the National Environmental Policy Act Review. Cooperating agencies are Western, the U.S. Army Corps of Engineers and Grand County, Colo.

25

Uncertainties in Gapped Graphene  

E-Print Network (OSTI)

Motivated by graphene-based quantum computer we examine the time-dependence of the position-momentum and position-velocity uncertainties in the monolayer gapped graphene. The effect of the energy gap to the uncertainties is shown to appear via the Compton-like wavelength $\\lambda_c$. The uncertainties in the graphene are mainly contributed by two phenomena, spreading and zitterbewegung. While the former determines the uncertainties in the long-range of time, the latter gives the highly oscillation to the uncertainties in the short-range of time. The uncertainties in the graphene are compared with the corresponding values for the usual free Hamiltonian $\\hat{H}_{free} = (p_1^2 + p_2^2) / 2 M$. It is shown that the uncertainties can be under control within the quantum mechanical law if one can choose the gap parameter $\\lambda_c$ freely.

Eylee Jung; Kwang S. Kim; DaeKil Park

2011-07-27T23:59:59.000Z

26

Buffalo Gap II Wind Farm | Open Energy Information  

Open Energy Info (EERE)

Gap II Wind Farm Gap II Wind Farm Jump to: navigation, search Name Buffalo Gap II Wind Farm Facility Buffalo Gap II Sector Wind energy Facility Type Commercial Scale Wind Facility Status In Service Developer AES Corp. Energy Purchaser Direct Energy Location Taylor County TX Coordinates 32.310556°, -100.149167° 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":32.310556,"lon":-100.149167,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

27

Olene Gap Space Heating Low Temperature Geothermal Facility | Open Energy  

Open Energy Info (EERE)

Olene Gap Space Heating Low Temperature Geothermal Facility Olene Gap Space Heating Low Temperature Geothermal Facility Jump to: navigation, search Name Olene Gap Space Heating Low Temperature Geothermal Facility Facility Olene Gap Sector Geothermal energy Type Space Heating Location Klamath County, Oregon Coordinates 42.6952767°, -121.6142133° 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":[]}

28

Pulse width modulation inverter with battery charger  

DOE Patents (OSTI)

An inverter is connected between a source of DC power and a three-phase AC induction motor, and a microprocessor-based circuit controls the inverter using pulse width modulation techniques. In the disclosed method of pulse width modulation, both edges of each pulse of a carrier pulse train are equally modulated by a time proportional to sin .theta., where .theta. is the angular displacement of the pulse center at the motor stator frequency from a fixed reference point on the carrier waveform. The carrier waveform frequency is a multiple of the motor stator frequency. The modulated pulse train is then applied to each of the motor phase inputs with respective phase shifts of 120.degree. at the stator frequency. Switching control commands for electronic switches in the inverter are stored in a random access memory (RAM) and the locations of the RAM are successively read out in a cyclic manner, each bit of a given RAM location controlling a respective phase input of the motor. The DC power source preferably comprises rechargeable batteries and all but one of the electronic switches in the inverter can be disabled, the remaining electronic switch being part of a "flyback" DC-DC converter circuit for recharging the battery.

Slicker, James M. (Union Lake, MI)

1985-01-01T23:59:59.000Z

29

Multiple gap photovoltaic device  

DOE Patents (OSTI)

A multiple gap photovoltaic device having a transparent electrical contact adjacent a first cell which in turn is adjacent a second cell on an opaque electrical contact, includes utilizing an amorphous semiconductor as the first cell and a crystalline semiconductor as the second cell.

Dalal, Vikram L. (Newark, DE)

1981-01-01T23:59:59.000Z

30

Colorado Gap Analysis  

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

Colorado Gap Analysis Colorado Gap Analysis 2 The Building Codes Assistance Project (BCAP) BCAP is a non-profit advocacy organization established in 1994 as a joint initiative of the Alliance to Save Energy, the American Council for an Energy-Efficient Economy, and the Natural Resources Defense Council. BCAP focuses on providing state and local governments in the U.S., as well as stakeholder organizations, with support on code adoption and implementation through direct assistance, research, data analysis, and coordination with other activities and allies. With over sixteen years of experience supporting numerous state energy offices and city building departments, along with tracking code activities across the country, BCAP is well-positioned to assist in local and statewide activity to advance

31

Experimental Stark widths and shifts of Cr II spectral lines  

Science Journals Connector (OSTI)

......Stark widths and shifts of Crii spectral lines J. A. Aguilera 1 C. Aragon 1 J. Manrique...Spain Stark widths and shifts of Crii lines with wavelengths in the range 2000-3500-a...to control the self-absorption of the lines. The Stark widths and shifts are compared......

J. A. Aguilera; C. Aragón; J. Manrique

2014-01-01T23:59:59.000Z

32

?Thermo-Hydraulic Performance of a Roughened Square Duct Having Inclined Ribs with a Gap on Two Opposite Walls  

E-Print Network (OSTI)

Abstract:- Experimentation has been carried out to find the influence of a gap provided in ribs on thermohydraulic performance of a square duct roughened with discrete inclined ribs. The two opposite walls of the square duct are roughened with ribs having attack angle (?) of 45 0 and a gap on its length. The investigation has been performed for relative roughness pitch (p/e) of 10, relative roughness height (e/Dh) of 0.060 and Reynolds number is varied in the range of 5000-40,000. The other rib parameters; relative gap position (d/W) and relative gap width (g/e) is varied in the range of 1/4 – 2/3(4 steps) and 0.5 – 1.5 (3 steps) respectively. The comparative study of various cases shows that the ribs with a gap considerably enhance the value of thermohydraulic performance for the range of parameters taken for the present investigation. Presence of inclined ribs with a gap yields about 2.1-fold enhancements in thermo-hydraulic performance as compared to smooth duct. The maximum value of thermo-hydraulic performance parameter has been observed for relative gap width of 1.0 and the relative gap position of 1/3. Keywords:- Relative gap width, Relative gap position, Reynolds number, Thermo-hydraulic performance. I.

unknown authors

33

Energy Gap in Nuclear Matter  

Science Journals Connector (OSTI)

......research-article Articles Energy Gap in Nuclear Matter Takeshi Ishihara a...Research, Kokubunji, Tokyo An energy gap in nuclear matter is studied. The nucleon-nucleon...1966) pp. 1026-1042 Nuclear Force and Energy Gap in Finite Nuclei Hiroharu......

Takeshi Ishihara; Ryozo Tamagaki; Hajime Tanaka; Masaru Yasuno

1963-11-01T23:59:59.000Z

34

Buffalo Gap 3 Wind Farm | Open Energy Information  

Open Energy Info (EERE)

Buffalo Gap 3 Wind Farm Buffalo Gap 3 Wind Farm Facility Buffalo Gap 3 Sector Wind energy Facility Type Commercial Scale Wind Facility Status In Service Owner AES Wind Generation Developer AES Wind Generation Energy Purchaser Direct Energy Location TX Coordinates 32.310556°, -100.149167° 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":32.310556,"lon":-100.149167,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

35

Aerodynamic drag reduction apparatus for gap-divided bluff bodies such as tractor-trailers  

DOE Patents (OSTI)

An apparatus for reducing the aerodynamic drag of a bluff-bodied vehicle such as a tractor-trailer in a flowstream, the bluff-bodied vehicle of a type having a leading portion, a trailing portion connected to the leading portion, and a gap between the leading and trailing portions defining a recirculation zone. The apparatus is preferably a baffle assembly, such as a vertical panel, adapted to span a width of the gap between the leading and trailing portions so as to impede cross-flow through the gap, with the span of the baffle assembly automatically adjusting for variations in the gap width when the leading and trailing portions pivot relative to each other.

Ortega, Jason M. (Pacifica, CA); Salari, Kambiz (Livermore, CA)

2006-07-11T23:59:59.000Z

36

Complexified cones. Spectral gaps and variational principles  

E-Print Network (OSTI)

We consider contractions of complexified real cones, as recently introduced by Rugh in [Rugh10]. Dubois [Dub09] gave optimal conditions to determine if a matrix contracts a canonical complex cone. First we generalize his results to the case of complex operators on a Banach space and give precise conditions for the contraction and an improved estimate of the size of the associated spectral gap. We then prove a variational formula for the leading eigenvalue similar to the Collatz-Wielandt formula for a real cone contraction. Morally, both cases boil down to the study of suitable collections of 2 by 2 matrices and their contraction properties on the Riemann sphere.

Dubois, Loïc

2010-01-01T23:59:59.000Z

37

Systematic Study of Electronic Phases, Band Gaps and Band Overlaps of Bismuth Antimony Nanowires  

E-Print Network (OSTI)

We have developed an iterative one dimensional model to study the narrow band-gap and the associated non-parabolic dispersion relations for bismuth antimony nanowires. An analytical approximation has also been developed. Based on the general model, we have developed, we have calculated and analyzed the electronic phase diagrams and the band-gap/band-overlap map for bismuth antimony nanowires, as a function of stoichiometry, growth orientation, and wire width.

Shuang Tang; Mildred Dresselhaus

2013-12-03T23:59:59.000Z

38

GenII Gap Analysis  

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

GENII-Gap Analysis GENII-Gap Analysis Defense Nuclear Facilities Safety Board Recommendation 2002-1 Software Quality Assurance Improvement Plan Commitment 4.2.1.3: Software Quality Assurance Improvement Plan: GENII Gap Analysis Final Report U.S. Department of Energy Office of Environment, Safety, and Health 1000 Independence Ave., S.W. Washington, DC 20585-2040 May 2004 GENII Gap Analysis May 2004 Final Report INTENTIONALLY BLANK ii GENII Gap Analysis May 2004 Final Report FOREWORD This document provides an evaluation of the Software Quality Assurance (SQA) attributes of GENII, a radiological dispersion computer code, relative to established requirements. This evaluation, a "gap analysis", is performed to meet commitment 4.2.1.3 of the Department of

39

MACCS2 Final Gap Analysis  

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

MACCS2-Gap Analysis MACCS2-Gap Analysis Defense Nuclear Facilities Safety Board Recommendation 2002-1 Software Quality Assurance Improvement Plan Commitment 4.2.1.3: Software Quality Assurance Improvement Plan: MACCS2 Gap Analysis Final Report U.S. Department of Energy Office of Environment, Safety and Health 1000 Independence Ave., S.W. Washington, DC 20585-2040 May 2004 MACCS2 Gap Analysis May 2004 Final Report INTENTIONALLY BLANK ii MACCS2 Gap Analysis May 2004 Final Report FOREWORD This report documents the outcome of an evaluation of the Software Quality Assurance (SQA) attributes of the radiological dispersion computer code, MACCS2, relative to established software requirements. This evaluation, a "gap analysis", is performed to meet commitment 4.2.1.3 of the

40

Resonance Widths in Polycrystalline Nickel-Cobalt Ferrites  

Science Journals Connector (OSTI)

The width of the ferromagnetic resonance has been measured at 10 000 Mc/sec in polycrystalline mixed ferrites of the composition Co?Ni1-?Fe2O4, with ? between 0 and 0.04. The minimum line width is found for ?=0.025 at 20°C. This, as well as the variation of line width with temperature, can be understood on the basis of known single crystal properties and the following assumptions: (a) line width is a linear function of |K|; (b) crystal anisotropy is an additive atomic property.

M. H. Sirvetz and J. H. Saunders

1956-04-15T23:59:59.000Z

Note: This page contains sample records for the topic "optimal gap width" 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

Gap and stripline combined monitor  

DOE Patents (OSTI)

A combined gap and stripline monitor device for measuring the intensity and position of a charged particle beam bunch in a beam pipe of a synchrotron radiation facility is disclosed. The monitor has first and second beam pipe portions with an axial gap therebetween. An outer pipe cooperates with the first beam pipe portion to form a gap enclosure, while inner strips cooperate with the first beam pipe portion to form a stripline monitor, with the stripline length being the same as the gap enclosure length. 4 figs.

Yin, Y.

1986-08-19T23:59:59.000Z

42

Multiple Equilibria and Hysteresis of Two Unequal-Transport Western Boundary Currents Colliding at a Gap  

Science Journals Connector (OSTI)

The nonlinear collision of two western boundary currents (WBCs) of Munk thickness LM colliding near a gap of width 2a is studied using a 1.5-layer, reduced-gravity, quasigeostrophic ocean model. The work is a continuation of our recent study on ...

Zheng Wang; Dongliang Yuan

2014-07-01T23:59:59.000Z

43

Optical waveguide device with an adiabatically-varying width  

DOE Patents (OSTI)

Optical waveguide devices are disclosed which utilize an optical waveguide having a waveguide bend therein with a width that varies adiabatically between a minimum value and a maximum value of the width. One or more connecting members can be attached to the waveguide bend near the maximum value of the width thereof to support the waveguide bend or to supply electrical power to an impurity-doped region located within the waveguide bend near the maximum value of the width. The impurity-doped region can form an electrical heater or a semiconductor junction which can be activated with a voltage to provide a variable optical path length in the optical waveguide. The optical waveguide devices can be used to form a tunable interferometer (e.g. a Mach-Zehnder interferometer) which can be used for optical modulation or switching. The optical waveguide devices can also be used to form an optical delay line.

Watts; Michael R. (Albuquerque, NM), Nielson; Gregory N. (Albuquerque, NM)

2011-05-10T23:59:59.000Z

44

Linear Rank-Width of Trees Mamadou Moustapha Kant Isolde Adler  

E-Print Network (OSTI)

Linear Rank-Width of Trees Mamadou Moustapha Kanté Isolde Adler November 8, 2012 Linear rank-width is the linearised version of the complexity graph pa- rameter rank-width. While, path-width, the linearised version of tree-width is well-studied, less is known about linear rank-width. We will show that path

Fondements et Applications, Université Paris 7

45

Tube Width Fluctuations in F-Actin Solutions  

Science Journals Connector (OSTI)

We determine the statistics of the local tube width in F-actin solutions, beyond the usually reported mean value. Our experimental observations are explained by a segment fluid theory based on the binary collision approximation. In this systematic generalization of the standard mean-field approach, effective polymer segments interact via a potential representing the topological constraints. The analytically predicted universal tube width distribution with a stretched tail is in good agreement with the data.

J. Glaser; D. Chakraborty; K. Kroy; I. Lauter; M. Degawa; N. Kirchgeßner; B. Hoffmann; R. Merkel; M. Giesen

2010-07-13T23:59:59.000Z

46

Pleasant Gap, Pennsylvania: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Gap, Pennsylvania: Energy Resources Gap, Pennsylvania: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 40.8681177°, -77.7466665° 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":40.8681177,"lon":-77.7466665,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

47

Quantifying yield gaps in wheat production in Russia  

Science Journals Connector (OSTI)

Crop yields must increase substantially to meet the increasing demands for agricultural products. Crop yield increases are particularly important for Russia because low crop yields prevail across Russia's widespread and fertile land resources. However, reliable data are lacking regarding the spatial distribution of potential yields in Russia, which can be used to determine yield gaps. We used a crop growth model to determine the yield potentials and yield gaps of winter and spring wheat at the provincial level across European Russia. We modeled the annual yield potentials from 1995 to 2006 with optimal nitrogen supplies for both rainfed and irrigated conditions. Overall, the results suggest yield gaps of 1.51–2.10 t ha?1, or 44–52% of the yield potential under rainfed conditions. Under irrigated conditions, yield gaps of 3.14–3.30 t ha?1, or 62–63% of the yield potential, were observed. However, recurring droughts cause large fluctuations in yield potentials under rainfed conditions, even when the nitrogen supply is optimal, particularly in the highly fertile black soil areas of southern European Russia. The highest yield gaps (up to 4 t ha?1) under irrigated conditions were detected in the steppe areas in southeastern European Russia along the border of Kazakhstan. Improving the nutrient and water supply and using crop breeds that are adapted to the frequent drought conditions are important for reducing yield gaps in European Russia. Our regional assessment helps inform policy and agricultural investors and prioritize research that aims to increase crop production in this important region for global agricultural markets.

Florian Schierhorn; Monireh Faramarzi; Alexander V Prishchepov; Friedrich J Koch; Daniel Müller

2014-01-01T23:59:59.000Z

48

Capacitor charging FET switcher with controller to adjust pulse width  

DOE Patents (OSTI)

A switching power supply includes an FET full bridge, a controller to drive the FETs, a programmable controller to dynamically control final output current by adjusting pulse width, and a variety of protective systems, including an overcurrent latch for current control. Power MOSFETS are switched at a variable frequency from 20-50 kHz to charge a capacitor load from 0 to 6 kV. A ferrite transformer steps up the DC input. The transformer primary is a full bridge configuration with the FET switches and the secondary is fed into a high voltage full wave rectifier whose output is connected directly to the energy storage capacitor. The peak current is held constant by varying the pulse width using predetermined timing resistors and counting pulses. The pulse width is increased as the capacitor charges to maintain peak current. A digital ripple counter counts pulses, and after the desired number is reached, an up-counter is clocked. The up-counter output is decoded to choose among different resistors used to discharge a timing capacitor, thereby determining the pulse width. A current latch shuts down the supply on overcurrent due to either excessive pulse width causing transformer saturation or a major bridge fault, i.e., FET or transformer failure, or failure of the drive circuitry.

Mihalka, Alex M. (Livermore, CA)

1986-01-01T23:59:59.000Z

49

LENGTH OF BEAMLINES AND WIDTH OF THE LS-37  

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

LENGTH OF BEAMLINES AND WIDTH OF THE LENGTH OF BEAMLINES AND WIDTH OF THE LS-37 November 10, 1985 G. K. Shenoy G. S. Knapp EXPERIMENTAL HALL AT A 6-GeV SYNCHROTRON FACILITY The width of the experimental hall at a 6-GeV facility is closely related to the length of the beamlines. This note addresses this aspect in some de tail. In general, no two beamlines will have identical lengths or the placement of various optical elements. Hence fixing the beamline lengths prior to their assignment to specific experiments is difficult. In spite of this fact, a few general conclusions are made. 1. At least 25m of all the beamlines will be behind the shielding wall. Within this length many beamline components can be accommodated as shown in Fig. 1. 2. For most beamlines on bending magnets (BM), the first optical element will

50

Bridging Gaps | Department of Energy  

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

Bridging Gaps Bridging Gaps Bridging Gaps Analysis to identify issues, best practices, and recommendations Implementation of modernization, infrastructure planning, and sustainability efforts Evaluation of planning practices to develop an adaptable method that considers revitalization and reuse Analysis of issues with transfers at less than fair market value and recommendations for improvement Evaluation of the Ten-Year (25-year) Site Plans for revitalization and strategic planning interests Tools to be incorporated into programmatic business models and processes Best-practices guide for energy projects Guidance and recommendations to improve the 10 CFR 770 process and less-than-fair-market-value transfers Tools/checklist to evaluate assets for reuse as part of planning

51

Virtual gap dielectric wall accelerator  

DOE Patents (OSTI)

A virtual, moving accelerating gap is formed along an insulating tube in a dielectric wall accelerator (DWA) by locally controlling the conductivity of the tube. Localized voltage concentration is thus achieved by sequential activation of a variable resistive tube or stalk down the axis of an inductive voltage adder, producing a "virtual" traveling wave along the tube. The tube conductivity can be controlled at a desired location, which can be moved at a desired rate, by light illumination, or by photoconductive switches, or by other means. As a result, an impressed voltage along the tube appears predominantly over a local region, the virtual gap. By making the length of the tube large in comparison to the virtual gap length, the effective gain of the accelerator can be made very large.

Caporaso, George James; Chen, Yu-Jiuan; Nelson, Scott; Sullivan, Jim; Hawkins, Steven A

2013-11-05T23:59:59.000Z

52

Energy Gap in Nuclear Matter  

Science Journals Connector (OSTI)

The magnitude of the energy gap in nuclear matter associated with a highly correlated ground state of of the type believed to be important in the theory of superconductivity has been evaluated theoretically. The integral equation of Cooper, Mills, and Sessler is linearized and transformed into a form suitable for numerical solution. The energy gap, calculated by using an appropriate single-particle potential and the Gammel-Thaler two-body potential, is found to be a very strong function of the density of nuclear matter, and of the effective mass at the Fermi surface. It is concluded that the magnitude of the energy gap for nuclear matter should not be compared directly with experimental values for finite nuclei, although the results suggest that if the theory is extended to apply to finite nuclei it probably would be in agreement with experiment.

V. J. Emery and A. M. Sessler

1960-07-01T23:59:59.000Z

53

Local Energy Gap in Deformed Carbon Nanotubes  

Science Journals Connector (OSTI)

......Local Energy Gap in Deformed Carbon Nanotubes Ken-ichi Sasaki 1 *) Yoshiyuki...gap along the axis of a deformed nanotube. We compare our energy gap results...experimental data on energy gaps in nanotubes and peapods. We also discuss the......

Ken-ichi Sasaki; Yoshiyuki Kawazoe; Riichiro Saito

2005-03-01T23:59:59.000Z

54

Signal Timing Optimization to Improve Air Quality  

E-Print Network (OSTI)

the gap that the research on signal optimization at intersections lags behind the development of emissions models. The methodology development includes four levels: the vehicle level, the movement level, the intersection level, and the arterial level...

Lv, Jinpeng 1983-

2012-12-11T23:59:59.000Z

55

Domain Walls in Gapped Graphene  

Science Journals Connector (OSTI)

The electronic properties of a particular class of domain walls in gapped graphene are investigated. We show that they can support midgap states which are localized in the vicinity of the domain wall and propagate along its length. With a finite density of domain walls, these states can alter the electronic properties of gapped graphene significantly. If the midgap band is partially filled, the domain wall can behave like a one-dimensional metal embedded in a semiconductor and could potentially be used as a single-channel quantum wire.

G. W. Semenoff; V. Semenoff; Fei Zhou

2008-08-21T23:59:59.000Z

56

Multiple input electrode gap controller  

DOE Patents (OSTI)

A method and apparatus for controlling vacuum arc remelting (VAR) furnaces by estimation of electrode gap based on a plurality of secondary estimates derived from furnace outputs. The estimation is preferably performed by Kalman filter. Adaptive gain techniques may be employed, as well as detection of process anomalies such as glows. 17 figs.

Hysinger, C.L.; Beaman, J.J.; Melgaard, D.K.; Williamson, R.L.

1999-07-27T23:59:59.000Z

57

Sampling spectral-line intensity and width meter  

SciTech Connect

This paper presents a method and apparatus for measuring the spectral line widths of hollow cathode lamps operating in the pulse mode. For simplicity, the increment in spectral line width with transition from stationary to pulse conditions is measured. The minimum and maximum light-pulse durations are 10 usec and 1 usec. A block diagram of the apparatus is shown. Recordings of the resonance lines of Yb and Ge of LT-2 lamps for current pulses of 100 mA with an off-duty factor of 5 for 400 usec are shown. The standard line widths corresponded to 20 mA for Yb and 30 mA for Ge. In the first and second cases, the line widths were changed by factors of 1.14 and 1.6 during the current pulse. It is not advisable to use a current-pulse duration of more than 100 usec for the indicated amplitude and off-duty factor.

Kureichik, K.P.; Khomyak, A.S.; Kozlovskii, N.V.

1986-06-01T23:59:59.000Z

58

The width of gamma-ray burst spectra  

E-Print Network (OSTI)

The emission processes active in the highly relativistic jets of gamma-ray bursts (GRBs) remain unknown. In this paper we propose a new measure to describe spectra: the width of the $EF_E$ spectrum, a quantity dependent only on finding a good fit to the data. We apply this to the full sample of GRBs observed by Fermi/GBM and CGRO/BATSE. The results from the two instruments are fully consistent. We find that the median widths of spectra from long and short GRBs are significantly different (chance probability $<10^{-6}$). The width does not correlate with either duration or hardness, and this is thus a new, independent distinction between the two classes. Comparing the measured spectra with widths of spectra from fundamental emission processes -- synchrotron and blackbody radiation -- the results indicate that a large fraction of GRB spectra are too narrow to be explained by synchrotron radiation from a distribution of electron energies: for example, 78% of long GRBs and 85% of short GRBs are incompatible wi...

Axelsson, Magnus

2014-01-01T23:59:59.000Z

59

Chiral expansion of the $?^0\\rightarrow??$ decay width  

E-Print Network (OSTI)

A chiral field theory of mesons has been applied to study the contribution of the current quark masses to the $\\pi^0\\rightarrow\\gamma\\gamma$ decay width at the next leading order. $2\\%$ enhancement has been predicted and there is no new parameter.

Bing An Li

2011-09-07T23:59:59.000Z

60

Band Gap Optimization of Two-Dimensional Photonic Crystals Using ...  

E-Print Network (OSTI)

Jul 10, 2009 ... the dielectric material and the wave vector. .... which SDP can be well applied, thanks to its efficiency and robustness of handling this type of ...... Band diagrams plotted in the figures below show the eigenvalues moving along ...

2009-07-10T23:59:59.000Z

Note: This page contains sample records for the topic "optimal gap width" 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

AC loss characteristics of superconducting power transmission cables: gap effect and  

Science Journals Connector (OSTI)

Four groups of superconducting power transmission cables composed of coated conductors with 4.0 mm width and 2 µm superconductor thickness have been designed, including mono-layer, two-layer, four-layer and six-layer cables. In each group, three types of cables have been constructed with gaps of different size between adjacent coated conductors, which are classified into small gap, medium gap and large gap. Moreover, different lateral critical current density (Jc) distributions, specifically a uniform distribution and a trapezoidal distribution with a sloping shoulder, have been assumed while calculating the AC losses of these cables numerically by using a one-dimensional FEM model. Numerical results show that AC losses in mono-layer cables are significantly influenced by gaps between coated conductors as well as lateral Jc distribution, while cables with many layers are hardly affected by them. This proves that small gaps between coated conductors are not absolutely essential to reduce AC losses in multi-layer cables, and a sloping shoulder of the Jc distribution is more allowable in multi-layer cables than in mono-layer cables. The AC loss distributions among layers in six-layer cables are presented and the reasons for different influences of the gap as well as the lateral Jc distribution in mono-layer and multi-layer cables are discussed.

Quan Li; Naoyuki Amemiya; Katsutoku Takeuchi; Taketsune Nakamura; Noboru Fujiwara

2010-01-01T23:59:59.000Z

62

Emplacement Gantry Gap Analysis Study  

SciTech Connect

To date, the project has established important to safety (ITS) performance requirements for structures, systems, and components (SSCs) based on the identification and categorization of event sequences that may result in a radiological release. These performance requirements are defined within the ''Nuclear Safety Design Bases for License Application'' (NSDB) (BSC 2005 [DIRS 171512], Table A-11). Further, SSCs credited with performing safety functions are classified as ITS. In turn, assurance that these SSCs will perform as required is sought through the use of consensus codes and standards. This gap analysis is based on the design completed for license application only. Accordingly, identification of ITS SSCs beyond those defined within the NSDB are based on designs that may be subject to further development during detail design. Furthermore, several design alternatives may still be under consideration to satisfy certain safety functions, and final selection will not be determined until further design development has occurred. Therefore, for completeness, alternative designs currently under consideration will be discussed throughout this study. This gap analysis will evaluate each code and standard identified within the ''Emplacement Gantry ITS Standards Identification Study'' (BSC 2005 [DIRS 173586]) to ensure each ITS performance requirement is fully satisfied. When a performance requirement is not fully satisfied, a gap is highlighted. This study will identify requirements to supplement or augment the code or standard to meet performance requirements. Further, this gap analysis will identify nonstandard areas of the design that will be subject to a design development plan. Nonstandard components and nonstandard design configurations are defined as areas of the design that do not follow standard industry practices or codes and standards. Whereby, assurance that an SSC will perform as required may not be readily sought though the use of consensus standards. This gap analysis is prepared by the Emplacement and Retrieval (E&R) project team and is intended for the sole use of the Engineering department in work regarding the emplacement gantry. Yucca Mountain Project personnel from the E&R project team should be consulted before use of this gap analysis for purposes other than those stated herein or by individuals other than authorized by the Engineering department.

R. Thornley

2005-05-27T23:59:59.000Z

63

A Direct Measurement of the $W$ Decay Width  

SciTech Connect

A direct measurement of the W boson total decay width is presented in proton-antiproton collisions at {radical}s = 1.96 TeV using data collected by the CDF II detector. The measurement is made by fitting a simulated signal to the tail of the transverse mass distribution in the electron and muon decay channels. An integrated luminosity of 350 pb{sup -1} is used, collected between February 2002 and August 2004. Combining the results from the separate decay channels gives the decay width as 2.038 {+-} 0.072 GeV in agreement with the theoretical prediction of 2.093 {+-} 0.002 GeV. A system is presented for the management of detector calibrations using a relational database schema. A description of the implementation and monitoring of a procedure to provide general users with a simple interface to the complete set of calibrations is also given.

Vine, Troy; /University Coll. London

2008-08-01T23:59:59.000Z

64

Low band gap polymers Organic Photovoltaics  

E-Print Network (OSTI)

Low band gap polymers for Organic Photovoltaics Eva Bundgaard Ph.D. Dissertation Risø National Bundgaard Title: Low band gap polymers for Organic photovoltaics Department: The polymer department Report the area of organic photovoltaics are focusing on low band gap polymers, a type of polymer which absorbs

65

Generation Gaps in Engineering? David J. Kim  

E-Print Network (OSTI)

Generation Gaps in Engineering? by David J. Kim B.S., Computer Science and Engineering;3 Generation Gaps in Engineering? by David J. Kim Submitted to the System Design and Management Program on May in Engineering and Management ABSTRACT There is much enthusiastic debate on the topic of generation gaps

Gabrieli, John

66

Sootblowing optimization for improved boiler performance  

DOE Patents (OSTI)

A sootblowing control system that uses predictive models to bridge the gap between sootblower operation and boiler performance goals. The system uses predictive modeling and heuristics (rules) associated with different zones in a boiler to determine an optimal sequence of sootblower operations and achieve boiler performance targets. The system performs the sootblower optimization while observing any operational constraints placed on the sootblowers.

James, John Robert; McDermott, John; Piche, Stephen; Pickard, Fred; Parikh, Neel J

2013-07-30T23:59:59.000Z

67

GAP OPENING BY EXTREMELY LOW-MASS PLANETS IN A VISCOUS DISK  

SciTech Connect

By numerically integrating the compressible Navier-Stokes equations in two dimensions, we calculate the criterion for gap formation by a very low mass (q {approx} 10{sup -4}) protoplanet on a fixed orbit in a thin viscous disk. In contrast with some previously proposed gap-opening criteria, we find that a planet can open a gap even if the Hill radius is smaller than the disk scale height. Moreover, in the low-viscosity limit, we find no minimum mass necessary to open a gap for a planet held on a fixed orbit. In particular, a Neptune-mass planet will open a gap in a minimum mass solar nebula with suitably low viscosity ({alpha} {approx}< 10{sup -4}). We find that the mass threshold scales as the square root of viscosity in the low mass regime. This is because the gap width for critical planet masses in this regime is a fixed multiple of the scale height, not of the Hill radius of the planet.

Duffell, Paul C.; MacFadyen, Andrew I., E-mail: pcd233@nyu.edu, E-mail: macfadyen@nyu.edu [Center for Cosmology and Particle Physics, New York University, 4 Washington Place, New York, NY 10003 (United States)

2013-05-20T23:59:59.000Z

68

Optimization Journals, Sites, Societies  

E-Print Network (OSTI)

Optimization Online Links. Optimization related societies. Mathematical Optimization Society · SIAM · INFORMS. Optimization related journals. Mathematical ...

69

Stellar loci I. Metallicity dependence and intrinsic widths  

E-Print Network (OSTI)

Stellar loci are widely used for selection of interesting outliers, reddening determinations, and calibrations. However, hitherto the dependence of stellar loci on metallicity has not been fully explored and their intrinsic widths are unclear. In this paper, by combining the spectroscopic and re-calibrated imaging data of the SDSS Stripe 82, we have built a large, clean sample of dwarf stars with accurate colors and well determined metallicities to investigate the metallicity dependence and intrinsic widths of the SDSS stellar loci. Typically, one dex decrease in metallicity causes 0.20 and 0.02 mag decrease in colors u-g and g-r, and 0.02 and 0.02 mag increase in colors r-i and i-z, respectively. The variations are larger for metal-rich stars than for metal-poor ones, and for F/G/K stars than for A/M ones. Using the sample, we have performed two dimensional polynomial fitting to the u-g, g-r, r-i, and i-z colors as a function of color g-i and metallicity [Fe/H]. The residuals, at the level of 0.029, 0.008, 0...

Yuan, Haibo; Xiang, Maosheng; Huang, Yang; Chen, Bingqiu

2014-01-01T23:59:59.000Z

70

Adiabatic optimization without local minima  

E-Print Network (OSTI)

Several previous works have investigated the circumstances under which quantum adiabatic optimization algorithms can tunnel out of local energy minima that trap simulated annealing or other classical local search algorithms. Here we investigate the even more basic question of whether adiabatic optimization algorithms always succeed in polynomial time for trivial optimization problems in which there are no local energy minima other than the global minimum. Surprisingly, we find a counterexample in which the potential is a single basin on a graph, but the eigenvalue gap is exponentially small as a function of the number of vertices. In this counterexample, the ground state wavefunction consists of two "lobes" separated by a region of exponentially small amplitude. Conversely, we prove if the ground state wavefunction is single-peaked then the eigenvalue gap scales at worst as one over the square of the number of vertices.

Michael Jarret; Stephen P. Jordan

2014-05-29T23:59:59.000Z

71

Gap-Inhomogeneity-Induced Electronic States in Superconducting Bi2Sr2CaCu2O8+delta  

SciTech Connect

In this Letter, we analyze, using scanning tunneling spectroscopy, the density of electronic states in nearly optimally doped Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} in zero magnetic field. Focusing on the superconducting gap, we find patches of what appear to be two different phases in a background of some average gap, one with a relatively small gap and sharp large coherence peaks and one characterized by a large gap with broad weak coherence peaks. We compare these spectra with calculations of the local density of states for a simple phenomenological model in which a 2{zeta}{sub 0} x 2{zeta}{sub 0} patch with an enhanced or suppressed d-wave gap amplitude is embedded in a region with a uniform average d-wave gap.

Fang, A.C.

2010-02-25T23:59:59.000Z

72

Functional Area Qualification Standard Gap Analysis Qualification Cards |  

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

Services » Assistance » Federal Technical Capability Program » Services » Assistance » Federal Technical Capability Program » Functional Area Qualification Standard Gap Analysis Qualification Cards Functional Area Qualification Standard Gap Analysis Qualification Cards Note: 1. Save the document from the website onto your PC and close it. 2. Open the document on your PC. Answer "No" to the question regarding whether to open the documents as read only. Chemical Processing Gap Construction Management Gap Criticality Safety Gap Emergency Management Gap Environmental Restoration Gap Facility Representative Gap Fire Protection Engineering Gap General Technical Base Gap Industrial Hygiene Gap Mechanical Systems Gap Nuclear Explosive Safety Study Gap Nuclear Safety Specialist Gap Occupational Safety Gap Quality Assurance Gap

73

Optimization of Microfluidic Fuel Cells Using Transport Principles  

Science Journals Connector (OSTI)

Optimization of Microfluidic Fuel Cells Using Transport Principles ... In this paper, we describe an approach to designing microfluidic fuel cells that optimizes the reaction?depletion boundary layer using transport principles. ... The data represented as ? or · in Figure 7 correspond to microfluidic fuel cells where the gap between consecutive electrodes was not optimized. ...

Jinkee Lee; Keng Guan Lim; G. Tayhas R. Palmore; Anubhav Tripathi

2007-08-30T23:59:59.000Z

74

Hotspot Gap Analysis Final 20070323  

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

HS-0003 HS-0003 Software Evaluation of Hotspot and DOE Safety Software Toolbox Recommendation U.S. Department of Energy Office of Health, Safety and Security 1000 Independence Avenue, S.W. Washington, DC 20585-2040 March, 2007 ii Foreword This report documents the outcome of an evaluation of the Safety Software Quality Assurance (SSQA) attributes of Hotspot, a health physics application, relative to the safety software requirements identified in DOE O 414.1C, Quality Assurance. This evaluation, a "gap analysis", is performed according to the implementation guide DOE G 414.1-4, and is a requisite for deciding whether Hotspot should be designated as a toolbox code for DOE's safety software Central Registry. Comments regarding this document should be addressed to:

75

Systematics of S- and P-wave radiation widths  

SciTech Connect

The question of calculating differences in s- and p-wave radiation widths as a valid evaluation tool is explored. A purely statistical approach such as that provided by the Brink-Axel formula depends upon two factors: 1) an adequate description of the giant dipole resonance shape at energies well below the resonance, and 2) an adequate description of the level densities between the ground state and the excitation of the compound nucleus near the neutron separation energy. Some success has been obtained in certain regions of the periodic table with this simple approach, e.g., in the actinides where all nuclei exhibit similar rigid permanent deformations. However, if the method is to be used as a general evaluation procedure throughout the periodic table and particularly in regions where the radiative transition probabilities are enhanced by direct processes, it appears that much more nuclear structure information needs to be incorporated into the calculations.

Moore, M.S.

1980-09-22T23:59:59.000Z

76

Hydrothermal Exploration Data Gap Analysis Update  

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

Hydrothermal Exploration Data Gap Analysis presentation by Kate Young, Dan Getman, and Ariel Esposito at the 2012 Peer Review Meeting on May 10, 2012

77

FAQS Gap Analysis Qualification Card – Occupational Safety  

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

Functional Area Qualification Standard Gap Analysis Qualification Cards outline the differences between the last and latest version of the FAQ Standard.

78

FAQS Gap Analysis Qualification Card – Radiation Protection  

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

Functional Area Qualification Standard Gap Analysis Qualification Cards outline the differences between the last and latest version of the FAQ Standard.

79

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

NLE Websites -- All DOE Office Websites (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...

80

Narrow band gap amorphous silicon semiconductors  

DOE Patents (OSTI)

Disclosed is a narrow band gap amorphous silicon semiconductor comprising an alloy of amorphous silicon and a band gap narrowing element selected from the group consisting of Sn, Ge, and Pb, with an electron donor dopant selected from the group consisting of P, As, Sb, Bi and N. The process for producing the narrow band gap amorphous silicon semiconductor comprises the steps of forming an alloy comprising amorphous silicon and at least one of the aforesaid band gap narrowing elements in amount sufficient to narrow the band gap of the silicon semiconductor alloy below that of amorphous silicon, and also utilizing sufficient amounts of the aforesaid electron donor dopant to maintain the amorphous silicon alloy as an n-type semiconductor.

Madan, A.; Mahan, A.H.

1985-01-10T23:59:59.000Z

Note: This page contains sample records for the topic "optimal gap width" 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

Effect of gaps on the performance of the vertically installed wet thermal insulator  

SciTech Connect

In SMART, the main flow path of the reactor coolant and the pressurizer partially share common walls in the reactor coolant system. To reduce this heat transfer, the wet thermal insulator (WTI) is installed on the inner wall of the pressurizer. The WTI is constituted of stacked thin stainless steel plates. The water layer width between the plates is chosen to suppress natural convection in each layer. The plates of the WTI require clearance for thermal expansion. When the WTI is installed on a vertical wall, this clearance might cause gaps at the top and bottom at the operating condition. In this study, we focused on the effect of gaps at the both ends on the WTI performance. A numerical simulation was conducted for an 8-layer WTI with gaps at the both ends. To compare with this, a simulation of a WTI without a gap, which is an ideal case, was also conducted. The simulation was conducted in a 2-dimensional manner by a commercial computational fluid dynamics code, FLUENT. The simulations showed that the WTI thermal performance was substantially decreased by a flow that circulated through the top and bottom gaps and water layers at the sides of the WTI. This circulation caused a high temperature difference between the wall and the circulating flow. To find a way to prevent this performance deterioration of the WTI we simulated several cases with the smaller gap heights. However, the flow circulation and the higher heat transfer rate were still observed even at a case with the smallest gap, which seems to be hardly achievable in a real installation. Another way of reducing the flow circulation was suggested and also simulated in this study. (authors)

Kim, S. H.; Kim, Y. I.; Park, C. T.; Choi, S.; Yoon, J. [Korea Atomic Energy Research Inst., Daeduk-daero 989-111, Yuseong-Gu, Daejeon, 305-353 (Korea, Republic of)

2012-07-01T23:59:59.000Z

82

Optimization Neuroimaging'',  

E-Print Network (OSTI)

Canonical Ridge Analysis with Ridge Parameter Optimization F. �. Nielsen, L. K. Hansen and S. C - PLS 1 = k 0 = k optimal k k = optimal k k £ £ 0 #12; Canonical Ridge Analysis with Ridge Parameter Optimization F. �. Nielsen, L. K. Hansen and S. C. Strother The Human Brain Project, P20 MH57180 ``Spatial

Nielsen, Finn Ã?rup

83

Thin plate gap bridging study for Nd:YAG pulsed laser lap welds.  

SciTech Connect

In an on going study of gap bridging for thin plate Nd:YAG laser lap welds, empirical data, high speed imaging, and computer modeling were utilized to better understand surface physics attributed to the formation and solidification of a weld pool. Experimental data indicates better gap bridging can be achieved through optimized laser parameters such as pulse length, duration, and energy. Long pulse durations at low energies generating low peak powers were found to create the highest percent of gap bridging ability. At constant peak power, gap-bridging ability was further improved by using a smaller spot diameter resulting in higher irradiances. Hence, welding in focus is preferable for bridging gaps. Gas shielding was also found to greatly impact gap-bridging ability. Gapped lap welds that could not be bridged with UHP Argon gas shielding, were easily bridged when left unshielded and exposed to only air. Incident weld angle and joint offset were also investigated for their ability to improve gap bridging. Optical filters and brightlight surface illumination enabled high-speed imaging to capture the fluid dynamics of a forming and solidifying weld pool. The effects of various laser parameters and the weld pool's interaction with the laser beam could also be observed utilizing the high-speed imaging. The work described is used to develop and validate a computer model with improved weld pool physics. Finite element models have been used to derive insight into the physics of gap bridging. The dynamics of the fluid motion within the weld pool in conjunction with the free surface physics have been the primary focus of the modeling efforts. Surface tension has been found to be a more significant factor in determining final weld pool shape than expected.

Roach, Robert Allen; Fuerschbach, Phillip William; Bernal, John E.; Norris, Jerome T.

2006-01-01T23:59:59.000Z

84

Measurement of effective sheath width around cutoff probe in low-pressure plasmas  

SciTech Connect

Previous studies indicated that the measurement results of microwave probes can be improved by applying the adequate sheath width to their measurement models, and consequently the sheath width around the microwave probe tips has become very important information for microwave probe diagnostics. In this paper, we propose a method for measuring the argon plasma sheath width around the cutoff probe tips by applying the circuit model to the cutoff probe phase spectrum. The measured sheath width of the cutoff probe was found to be in good agreement with the floated sheath width calculated from the Child-Langmuir sheath law. The physical reasons for a discrepancy between the two measurements are also discussed.

Kim, D. W.; Oh, W. Y. [Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701 (Korea, Republic of)] [Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701 (Korea, Republic of); You, S. J., E-mail: sjyou@kriss.re.kr; Kim, J. H. [Center for Vacuum Technology, Korea Research Institute of Standards and Science, Daejeon 305-306 (Korea, Republic of)] [Center for Vacuum Technology, Korea Research Institute of Standards and Science, Daejeon 305-306 (Korea, Republic of); Chang, H. Y. [Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 305-701 (Korea, Republic of)] [Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 305-701 (Korea, Republic of)

2014-05-15T23:59:59.000Z

85

Gaps in the Heisenberg-Ising model  

Science Journals Connector (OSTI)

We report on the closing of gaps in the ground state of the critical Heisenberg-Ising chain at momentum ?. For half-filling, the gap closes at special values of the anisotropy ?=cos(?/Q), where Q is an integer. We explain this behavior with the help of the Bethe ansatz and show that the gap scales as a power of the system size with a variable exponent depending on ?. We use a finite-size analysis to calculate this exponent in the critical region, supplemented by perturbation theory at ??0. For rational 1/r fillings, the gap is shown to be closed for all values of ? and the corresponding perturbation expansion in ? shows a remarkable cancellation of various diagrams.

Rudolf A. Römer; Hans-Peter Eckle; Bill Sutherland

1995-07-15T23:59:59.000Z

86

Efficient Band Gap Prediction for Solids  

E-Print Network (OSTI)

An efficient method for the prediction of fundamental band gaps in solids using density functional theory (DFT) is proposed. Generalizing the Delta self-consistent-field (?SCF [delta SCF]) method to infinite solids, the ...

Chan, Maria K.

87

Columbia River Component Data Gap Analysis  

SciTech Connect

This Data Gap Analysis report documents the results of a study conducted by Washington Closure Hanford (WCH) to compile and reivew the currently available surface water and sediment data for the Columbia River near and downstream of the Hanford Site. This Data Gap Analysis study was conducted to review the adequacy of the existing surface water and sediment data set from the Columbia River, with specific reference to the use of the data in future site characterization and screening level risk assessments.

L. C. Hulstrom

2007-10-23T23:59:59.000Z

88

Anomalous Doppler effects in phononic band gaps  

Science Journals Connector (OSTI)

Doppler effects in periodic acoustic media were studied theoretically and experimentally. Analytical formulas are derived using the Green’s function formalism. We found that a far field observer cannot hear the sound inside a band gap from a stationary source, but a moving source can be heard even if the frequency is inside the gap, and the Doppler shifts can be inverted or anomalously large.

Xinhua Hu; Zhihong Hang; Jensen Li; Jian Zi; C. T. Chan

2006-01-30T23:59:59.000Z

89

Gap between jets at the LHC  

SciTech Connect

We describe a NLL BFKL calculation implemented in the HERWIG MC of the gap between jets cross section, that represent a test of BFKL dynamics. We compare the predictions with recent measurements at the Tevatron and present predictions for the LHC. We also discuss the interesting process of looking for gap between jets in diffractive events when protons are detected in the ATLAS Forward Physics (AFP) detectors.

Royon, Christophe [CEA/IRFU/Service de physique des particules, CEA/Saclay, 91191 Gif-sur-Yvette cedex (France)

2013-04-15T23:59:59.000Z

90

Beam dumping system and abort gap  

E-Print Network (OSTI)

The performance of the beam dumping systems and the abort gap cleaning are reviewed in the context of the general machine protection system. Details of the commissioning experience and setting up, encountered equipment problems, the experience with and status of the eXternal Post Operational Checks (XPOC) and the importance of operational procedures are presented for the beam dumping system. The brief experience with the abort gap cleaning is also presented.

Uythoven, J

2010-01-01T23:59:59.000Z

91

Fact #609: February 8, 2010 The Transportation Petroleum Gap...  

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

09: February 8, 2010 The Transportation Petroleum Gap Fact 609: February 8, 2010 The Transportation Petroleum Gap In 1989 the transportation sector petroleum consumption surpassed...

92

Fact #560: March 2, 2009 The Transportation Petroleum Gap | Department...  

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

0: March 2, 2009 The Transportation Petroleum Gap Fact 560: March 2, 2009 The Transportation Petroleum Gap In 1989 the transportation sector petroleum consumption surpassed U.S....

93

Fact #687: August 8, 2011 The Transportation Petroleum Gap |...  

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

7: August 8, 2011 The Transportation Petroleum Gap Fact 687: August 8, 2011 The Transportation Petroleum Gap In 1989 the transportation sector petroleum consumption surpassed U.S....

94

Band-Gap Engineering of Carbon Nanotubes with Grain Boundaries...  

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

Band-Gap Engineering of Carbon Nanotubes with Grain Boundaries. Band-Gap Engineering of Carbon Nanotubes with Grain Boundaries. Abstract: Structure and electronic properties of...

95

Technical Standards, MELCOR - Gap Analysis - May 3, 2004 | Department...  

Energy Savers (EERE)

3, 2004 Technical Standards, MELCOR - Gap Analysis - May 3, 2004 May 3, 2004 Software Quality Assurance Improvement Plan: MELCOR Gap Analysis This report documents the outcome of...

96

Bridging the Gap between Fundamental Physics and Chemistry and...  

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

Bridging the Gap between Fundamental Physics and Chemistry and Applied Models for HCCI Engines Bridging the Gap between Fundamental Physics and Chemistry and Applied Models for...

97

Radiation Probabilities, Auger Effect and Energy Level Widths for Au(79)  

Science Journals Connector (OSTI)

The theory of energy level widths developed by Weisskopf and Wigner and by Wentzel is applied to the calculation of the energy level widths of Au(79). Radiation and Auger transition probabilities are determined separately with the aid of numerically integrated nonrelativistic eigenfunctions, the latter being calculated for electrons moving in the Fermi-Thomas field of Tl(81)++. Sources of error are considered, the major one being the nonrelativistic treatment. The band width due to the interaction of electrons in different atoms in the crystal lattice does not add materially to the level width of the OI and lower states. Except for the K state, the Auger contribution to the width exceeds that of the radiation transitions. Where the majority of the significant Auger effects have been calculated (LI,MI,NI) the total calculated width is found to be appreciably in excess of the observed width, but of the same order. The results confirm the view that the contributions of radiation transitions and Auger effects to the level widths of the initial and final states of the atom suffice to explain the magnitude of the widths of the x-ray lines emitted by the heavy elements.

E. G. Ramberg and F. K. Richtmyer

1937-06-01T23:59:59.000Z

98

Design of width-extensional, piezoelectric RF MEMS resonators and filters  

E-Print Network (OSTI)

Existing width-extensional, piezoelectric resonators (LBARs) suffer from high motional resistance and susceptibility to manufacturing disorder. Attempts to lower motional resistance by connecting many LBARs electrically ...

Cox, Jonathan A

2007-01-01T23:59:59.000Z

99

Product Design in Enterprise Wide Optimization  

E-Print Network (OSTI)

Product Design in Enterprise Wide Optimization Paul Arch, Michel Berghmans, Hany Farag NOVA · Simulation tools ­ Polymers/Plus ­ process modeling ­ Predici ­ reactor modeling ­ Gap analysis of commercial + M Dn + P1 Termination by combination Pn + Pm Dn+m Reactor model modified to resemble additional

Grossmann, Ignacio E.

100

Optimization 1-1 Convex Optimization & Duality  

E-Print Network (OSTI)

1 Optimization 1-1 Convex Optimization & Duality EEN634, Spring 2007 BASED ON LECTURES GIVEN AT MIT and Princeton Department of ECE, UMiami Optimization 1-2 #12;2 Optimization 1-3 Optimization 1-4 #12;3 Optimization 1-5 Optimization 1-6 #12;4 Optimization 1-7 Optimization 1-8 #12;5 Optimization 1-9 Optimization 1

Fan, Xingzhe

Note: This page contains sample records for the topic "optimal gap width" 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

The Widths of the L-Series Lines and of the Energy Levels of Au(79)  

Science Journals Connector (OSTI)

Following a résumé of the Weisskopf-Wigner theory of the shape of spectral lines, and, making certain simplifying assumptions, an expression is derived for the shape of an x-ray absorption discontinuity for the case where absorption is due to the ejection of electrons from inner orbits to the continuum of unoccupied Fermi-Sommerfeld levels. If these levels be assumed equally distributed, the curve (? vs. ?) is a simple arctangent, from which the width of the associated energy level (K, L?), corresponding to the full width of half-maximum of a radiated line, may be read directly. A more complicated expression results if the Fermi-Sommerfeld levels be not equally distributed. It is shown that the predicted shape of an absorption limit agrees reasonably well with the observed shape of the LIII limit of Au(79), the width of which was found to be 4.4 volts. Data are presented on the widths of some 23 lines in the L-series of Au(79), obtained by a two-crystal spectrometer. These widths, corrected for effect of the crystals, vary from 7.6 to 20.8 volts. Making use of the conclusion of Weisskopf and Wigner, that the width of a line may be interpreted as the sum of the widths of the energy states involved, and starting from the value 4.4 volts for the width of the LIII state, the widths of the several L, M, N and O states of Au(79) are computed. For a given total quantum number n, the width decreases with increasing orbital quantum number l. States having the same value of n, l have nearly the same width. For any given l, the L states are narrowest.

F. K. Richtmyer; S. W. Barnes; E. Ramberg

1934-11-15T23:59:59.000Z

102

Optimization Online - Optimal Design of Electrical Machines ...  

E-Print Network (OSTI)

Jun 8, 2011 ... Optimal Design of Electrical Machines: Mathematical Programming ... Science and Engineering (Multidisciplinary Design Optimization ).

Sonia Cafieri

2011-06-08T23:59:59.000Z

103

Bridging The Gap 2013 | ornl.gov  

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

3 3 Mar 05 2013 03-05-2013 12:00 AM - 03-06-2013 05:00 PM Oak Ridge National Laboratory hosted the third annual Bridging the Gap on March 5-6, 2013. This event brought entrepreneurs, scientists, and technology transfer experts together to explore opportunities around the lab's most promising new technologies. Oak Ridge, TN CONTACT : Email: Cassie Lopez Phone:(865) 576-9294 Add to Calendar SHARE Bridging The Gap 2013 March 5-6, 2013 (Oak Ridge, TN) Tennessee A-B-C Conference Rooms (Building 5200) Oak Ridge National Laboratory hosted the third annual Bridging the Gap on March 5-6, 2013. This event brought entrepreneurs, scientists, and technology transfer experts together to explore opportunities around the lab's most promising new technologies. Keynote Address: Innovations at ORNL, Thom Mason

104

A University of Alabama Axial-Gap Electric Motor Developmenty  

E-Print Network (OSTI)

CAVT A University of Alabama Axial-Gap Electric Motor Developmenty Research Center OBJECTIVE ­ Develop axial gap permanent-magnet electric Axial motor ­ Develop axial gap permanent-magnet electric motor topologies with high torque and power densities MOTIVATION ­ Axial-gap ("pancake") motors have

Carver, Jeffrey C.

105

Oscillation of Fourier Integrals with a spectral gap  

E-Print Network (OSTI)

May 30, 2003 ... In engineering literature, functions with a spectral gap are called high- .... High-

1910-30-71T23:59:59.000Z

106

Direct optimization overly optimizes data Kazunori Yoshizawa  

E-Print Network (OSTI)

OPINION Direct optimization overly optimizes data Kazunori Yoshizawa Systematic Entomology optimization is a criterion that recognizes sequence alignment and tree search as a single epistemological optimization criterion, all data partitions are combined and optimized simultaneously along with the same tree

Yoshizawa, Kazunori

107

Three-tank hoist scheduling problem with unbounded or zero-width processing windows  

E-Print Network (OSTI)

Three-tank hoist scheduling problem with unbounded or zero-width processing windows Fabien Mangione, the products are transferred in successive tanks by a hoist. Moreover, each processing time is nested between of identical parts in a balanced three-tank line. We prove that for zero-width or unbounded processing windows

Paris-Sud XI, Université de

108

Control of DNA minor groove width and Fis protein binding by the purine 2-amino group  

E-Print Network (OSTI)

Control of DNA minor groove width and Fis protein binding by the purine 2-amino group Stephen P within the center of the Fis­DNA complex narrows to about half the mean minor groove width of canonical B by the Fis protein, reduce binding affinities up to 2000-fold over A/T-rich sequences. We show here through

Rohs, Remo

109

Reduced Neutron Widths in the Nuclear Data Ensemble: Experiment and Theory Do Not Agree  

SciTech Connect

I have analyzed reduced neutron widths ($\\Gamma _{n}^{0}$) for the subset of 1245 resonances in the nuclear data ensemble (NDE) for which they have been reported. Random matrix theory (RMT) predicts for the Gaussian orthogonal ensemble (GOE) that these widths should follow a $\\chi ^{2}$ distribution having one degree of freedom ($\

Koehler, Paul Edward [ORNL

2009-01-01T23:59:59.000Z

110

Measurement of Stark widths and shifts of Ca II spectral lines  

Science Journals Connector (OSTI)

......Stark widths and shifts of Caii spectral lines J. A. Aguilera 1 C. Aragon 1 J. Manrique...Spain Stark widths and shifts of Ca ii lines have been measured by laser-induced breakdown...available in the literature. atomic data|line: profiles|plasmas| 1 INTRODUCTION Measurement......

J. A. Aguilera; C. Aragón; J. Manrique

2014-01-01T23:59:59.000Z

111

Width of the Hadley cell in simple and comprehensive general circulation models  

E-Print Network (OSTI)

Width of the Hadley cell in simple and comprehensive general circulation models Dargan M. W; published 19 September 2007. [1] The width of the Hadley cell is studied over a wide range of climate surface temperature lower boundary conditions are used in both models to study the response of the Hadley

Chen, Gang

112

Learning bounds via sample width for classifiers on finite metric spaces  

Science Journals Connector (OSTI)

In a recent paper [M. Anthony, J. Ratsaby, Maximal width learning of binary functions, Theoretical Computer Science 411 (2010) 138-147] the notion of sample width for binary classifiers mapping from the real line was introduced, and it was shown that ... Keywords: Generalization error, Learning algorithms, Machine learning

Martin Anthony, Joel Ratsaby

2014-04-01T23:59:59.000Z

113

Natural Gas Engine Development Gaps (Presentation)  

SciTech Connect

A review of current natural gas vehicle offerings is presented for both light-duty and medium- and heavy-duty applications. Recent gaps in the marketplace are discussed, along with how they have been or may be addressed. The stakeholder input process for guiding research and development needs via the Natural Gas Vehicle Technology Forum (NGVTF) to the U.S. Department of Energy and the California Energy Commission is reviewed. Current high-level natural gas engine development gap areas are highlighted, including efficiency, emissions, and the certification process.

Zigler, B.T.

2014-03-01T23:59:59.000Z

114

Closing Gaps in Modeling Multifamily Retrofits  

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

Building America Technical Update Meeting Denver, Colorado April 30, 2013 Jordan Dentz, The Levy Partnership., Inc. Closing Gaps in Modeling Multifamily Retrofits Advanced Residential Integrated Energy Solutions Overview * Multifamily modeling inputs (BA House Simulation Protocols) * Important multifamily measures * Other MF gaps Vital to meet 50% goals and therefore important to include in Building America's multifamily modeling capabilities Model Inputs * Heating set point * Cooling set point * Behavior assumptions 3 Heating Set Point - Central Systems * House simulation protocol assumes 71°F * Overheating is common * Approach: adjust modeled heating set point - how much? * Average heating season indoor temperature was 76°F in a sample of 18 buildings (ARIES 2013a)

115

PHYSICAL REVIEW B 84, 075144 (2011) Fundamental and excitation gaps in molecules of relevance for organic photovoltaics from an  

E-Print Network (OSTI)

for organic photovoltaics from an optimally tuned range-separated hybrid functional Sivan Refaely-Abramson,1 and optical gaps of relevant molecular systems are of primary importance for organic-based photovoltaics of photovoltaically relevant and other molecular systems. DOI: 10.1103/PhysRevB.84.075144 PACS number(s): 71.15.Mb I

Baer, Roi

116

Improved gap size estimation for scaffolding algorithms  

Science Journals Connector (OSTI)

......and 950 bp. The contigs were set to a fixed size of 3000 bp...three read libraries and four sets of contigs). The results of...parts of the distribution fail to cover the gap and only the longest...we simulated four different sets of contigs from the genome with......

Kristoffer Sahlin; Nathaniel Street; Joakim Lundeberg; Lars Arvestad

2012-09-01T23:59:59.000Z

117

Energy Gaps in a Spacetime Crystal  

E-Print Network (OSTI)

This paper presents an analysis of the band structure of a spacetime potential lattice created by a standing electromagnetic wave. We show that there are energy band gaps. We estimate the effect, and propose a measurement that could confirm the existence of such phenomena.

L. P. Horwitz; E. Z. Engelberg

2009-11-08T23:59:59.000Z

118

FINAL REPORT ON GDE GAP CELL  

SciTech Connect

A project has been undertaken to develop an electrochemical cell and support equipment for evaluation of a gas diffusion electrode-based, narrow-electrolyte-gap anode for SO{sub 2} oxidation in the hydrogen production cycle of the hybrid sulfur (HyS) process. The project supported the HyS development program at the Savannah River National Lab (SRNL). The benefits of using a gas diffusion electrode in conjunction with the narrow anolyte gap are being determined through electrochemical polarization testing under a variety conditions, and by comparison to results produced by SRNL and others using anode technologies that have no anolyte gap. These test results indicate that the NGA cell has low resistance suitable for use in the HyS electrolyzer, exhibits good efficiency at high current densities compared to the direct feed HyS electrolyzer, and indicates robust performance in extended testing over 65 hours. Seepage episodes were mostly caused by port clogging, which can be mitigated in future designs through minor modifications to the hardware. Significant reductions in sulfur crossover have not yet been demonstrated in the NGA configuration compared to in-house direct feed testing, but corroborative sulfur layer analysis is as yet incomplete. Further testing in a single-pass anolyte configuration is recommended for complete evaluation of steady-state electrochemical efficiency and SO{sub 2} crossover in the narrow gap configuration.

Herman, D.; Summers, W.; Danko, E.

2009-09-28T23:59:59.000Z

119

Spark gap device for precise switching  

DOE Patents (OSTI)

A spark gap device for precise switching of an energy storage capacitor into an exploding bridge wire load is disclosed. Niobium electrodes having a melting point of 2,415 degrees centrigrade are spaced apart by an insulating cylinder to define a spark gap. The electrodes are supported by conductive end caps which, together with the insulating cylinder, form a hermetically sealed chamber filled with an inert, ionizable gas, such as pure xenon. A quantity of solid radioactive carbon-14 within the chamber adjacent the spark gap serves as a radiation stabilizer. The sides of the electrodes and the inner wall of the insulating cylinder are spaced apart a sufficient distance to prevent unwanted breakdown initiation. A conductive sleeve may envelop the outside of the insulating member from the midpoint of the spark gap to the cap adjacent the cathode. The outer metallic surfaces of the device may be coated with a hydrogen-impermeable coating to lengthen the shelf life and operating life of the device. The device breaks down at about 1,700 volts for input voltage rates up to 570 volts/millisecond and allows peak discharge currents of up to 3,000 amperes from a 0.3 microfarad energy storage capacitor for more than 1,000 operations.

Boettcher, Gordon E. (Albuquerque, NM)

1984-01-01T23:59:59.000Z

120

Spark gap device for precise switching  

DOE Patents (OSTI)

A spark gap device for precise switching of an energy storage capacitor into an exploding bridge wire load is disclosed. Niobium electrodes having a melting point of 2,415 degrees centigrade are spaced apart by an insulating cylinder to define a spark gap. The electrodes are supported by conductive end caps which, together with the insulating cylinder, form a hermetically sealed chamber filled with an inert, ionizable gas, such as pure xenon. A quantity of solid radioactive carbon-14 within the chamber adjacent the spark gap serves as a radiation stabilizer. The sides of the electrodes and the inner wall of the insulating cylinder are spaced apart a sufficient distance to prevent unwanted breakdown initiation. A conductive sleeve may envelop the outside of the insulating member from the midpoint of the spark gap to the cap adjacent the cathode. The outer metallic surfaces of the device may be coated with a hydrogen-impermeable coating to lengthen the shelf life and operating life of the device. The device breaks down at about 1,700 volts for input voltage rates up to 570 volts/millisecond and allows peak discharge currents of up to 3,000 amperes from a 0.3 microfarad energy storage capacitor for more than 1,000 operations. 3 figs.

Boettcher, G.E.

1984-10-02T23:59:59.000Z

Note: This page contains sample records for the topic "optimal gap width" 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

Closing the Gap in Control System Implementations  

E-Print Network (OSTI)

of off-line scheduling and optimal control. ” In Proceedingsframework for scheduling control tasks from multiple controlthe problem of scheduling control tasks from multiple

Saha, Indranil

2013-01-01T23:59:59.000Z

122

Forestry and Poverty Data in Vietnam: Status, Gaps, and Potential Uses |  

Open Energy Info (EERE)

Forestry and Poverty Data in Vietnam: Status, Gaps, and Potential Uses Forestry and Poverty Data in Vietnam: Status, Gaps, and Potential Uses Jump to: navigation, search Tool Summary Name: Forestry and Poverty Data in Vietnam: Status, Gaps, and Potential Uses Agency/Company /Organization: Regional Community Forestry Training Center for Asia and the Pacific Sector: Land Focus Area: Forestry Topics: Co-benefits assessment, Background analysis Resource Type: Dataset, Publications Website: recoftc.org/site/fileadmin/docs/publications/The_Grey_Zone/2009/Forest Country: Vietnam UN Region: South-Eastern Asia Coordinates: 14.058324°, 108.277199° 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":14.058324,"lon":108.277199,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

123

Off-shell Effects and the Higgs Width | Argonne National Laboratory  

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

There has been a great deal of recent interest in the off-shell properties of the Higgs boson in VV decays, and in particular, the extraction of Higgs width constraints from...

124

2.5 MHz Line-Width High-Energy, 2µm Coherent Wind Lidar Transmitter  

Science Journals Connector (OSTI)

The design of a diode pumped, injection seeded MOPA with a transform limited line width and diffraction limited beam quality is presented. This lidar transmitter produces over 300mJ...

Petros, Mulugeta; Yu, Jirong; Trieu, Bo; Bai, Yingxin; Petzar, Paul; Singh, Upendra N; Reithmaier, Karl

125

The Method of Lines for the Analysis of Microstrip Lines on the Finite Width Substrate  

Science Journals Connector (OSTI)

A full-wave analysis of the electrical characteristics of the microstrip lines on the finite width substrate is presented. The substrate layer of the microstrip line must be treated as an inhomogeneous layer. ......

Bo Gao; Ling Tong; Xun Gong

2009-06-01T23:59:59.000Z

126

Nuclear magnetic absorption line widths in weak magnetic fields with a Robinson oscillator  

E-Print Network (OSTI)

NUCLEAR MAGNETIC ABSORPTION LINE WIDTHS IN WEAK MAGNETIC FIELDS WITH A ROBINSON OSCILLATOR A Thesis by TIMOTHY LEE FLUGUM Subnntted to the Graduate College of Texas ARM University in partial fulfillment of the requirement for the degree... of MASTER OF SCIENCE August 19SI Major Subject: Physics NUCLEAR MAGNETIC ABSORPTION LINE WIDTHS IN WEAK MAGNETIC FIELDS WITH A ROBINSON OSCILLATOR A Thesis TIMOTHY LEE FLUGUM Approved as to style and content by: Nelson M. Duller (Chairman...

Flugum, Timothy Lee

1987-01-01T23:59:59.000Z

127

Bridging the Gap 2011 | ornl.gov  

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

1 1 Apr 05 2011 04-05-2011 08:00 AM - 04-06-2011 05:00 PM Oak Ridge National Laboratory's Partnerships Directorate will host Bridging the Gap, a unique technology commercialization event, April 5-6 at Oak Ridge National Laboratory. Oak Ridge, TN Oak Ridge National Laboratory CONTACT : Email: Cassie Lopez Phone:(865) 576-9294 Add to Calendar SHARE Oak Ridge National Laboratory's Partnerships Directorate will host Bridging the Gap, a unique technology commercialization event, April 5-6 at Oak Ridge National Laboratory. The event will provide investors and entrepreneurs opportunities to learn about promising ORNL technologies available for license and to hear from ORNL licensees seeking growth capital. There will also be opportunities to tour ORNL's world-class research facilities and network with some of the

128

Bridging the Gap: Linking Simulation and Testing  

SciTech Connect

The Materials Genome Initiative (MGI) which is a key enabler for the Advanced Manufacturing Partnership, announced in 2011 by U.S. President Barack Obama, was established to accelerate the development and deployment of advanced materials. The MGI is driven by the need to "bridge the gap" between (I) experimental results and computational analysis to enable the rapid development and validation of new mateirals, and (II) the processes required to convert these materials into useable goods.

Krajewski, Paul E.; Carsley, John; Stoudt, Mark R.; Hovanski, Yuri

2012-09-01T23:59:59.000Z

129

SHEEP MOUNTAIN URANIUM PROJECT CROOKS GAP, WYOMING  

E-Print Network (OSTI)

;PROJECT OVERVIEW ·Site Location·Site Location ·Fremont , Wyoming ·Existing Uranium Mine Permit 381C·Existing Uranium Mine Permit 381C ·Historical Operation ·Western Nuclear Crooks Gap Project ·Mined 1956 ­ 1988 and Open Pit Mining ·Current Mine Permit (381C) ·Updating POO, Reclamation Plan & Bond ·Uranium Recovery

130

Entanglement Sudden Death in Band Gaps  

E-Print Network (OSTI)

Using the pseudomode method, we evaluate exactly time-dependent entanglement for two independent qubits, each coupled to a non-Markovian structured environment. Our results suggest a possible way to control entanglement sudden death by modifying the qubit-pseudomode detuning and the spectrum of the reservoirs. Particularly, in environments structured by a model of a density-of-states gap which has two poles, entanglement trapping and prevention of entanglement sudden death occur in the weak-coupling regime.

Ying-Jie Zhang

2009-11-10T23:59:59.000Z

131

Fabrication of photonic band gap materials  

DOE Patents (OSTI)

A method for forming a periodic dielectric structure exhibiting photonic band gap effects includes forming a slurry of a nano-crystalline ceramic dielectric or semiconductor material and monodisperse polymer microspheres, depositing a film of the slurry on a substrate, drying the film, and calcining the film to remove the polymer microspheres therefrom. The film may be cold-pressed after drying and prior to calcining. The ceramic dielectric or semiconductor material may be titania, and the polymer microspheres may be polystyrene microspheres.

Constant, Kristen (Ames, IA); Subramania, Ganapathi S. (Ames, IA); Biswas, Rana (Ames, IA); Ho, Kai-Ming (Ames, IA)

2002-01-15T23:59:59.000Z

132

NSLS prototype small-gap undulator (PSGU)  

SciTech Connect

The NSLS Prototype Small-Gap Undulator (PSGU) will serve as a tool to study lifetime degradation and the onset of beam instabilities as the beam duct aperture is decreased. The device will consist of variable-gap vacuum vessel had a permanent magnet undulator, with independent magnet-gap control. The vacuum vessel design attempts to minimize both residual gas pressures and beam impedances. The undulator will be 320 mm long and utilizes a pure-permanent-magnet structure with 6 blocks per 16 mm period. For a nominal operating aperture of 4 mm, PSGU will produce a peak brightness in the fundamental and third harmonic of 7 {times} 10{sup 16} and 1 {times} 10{sup 16} photons{sm bullet}sec{sup {minus}1}{sm bullet}mrad{sup {minus}2}mm{sup {minus}2}{sm bullet}(0.1% BW){sup {minus}1} at photon energies of 2.5 keV and 7.5 keV, respectively. 5 refs., 3 figs., 2 tabs.

Stefan, P.M.; Solomon, L.; Krinsky, S. (Brookhaven National Lab., Upton, NY (United States)); Rakowsky, G. (Rockwell International Corp., Canoga Park, CA (United States). Rocketdyne Div.)

1991-01-01T23:59:59.000Z

133

Technical Standards, GENII- Gap Analsis - May 3, 2004 | Department of  

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

Technical Standards, GENII- Gap Analsis - May 3, 2004 Technical Standards, GENII- Gap Analsis - May 3, 2004 Technical Standards, GENII- Gap Analsis - May 3, 2004 May 3, 2004 Software Quality Assurance Improvement Plan: GENII Gap Analysis The GENII software, for radiological dispersion and consequence analysis, is one of the codes designated for the toolbox. To determine the actions needed to bring the GENII code into compliance with the SQA qualification criteria, and develop an estimate of the resources required to perform the upgrade, the Implementation Plan has committed to sponsoring a code-specific gap analysis document. Technical Standards, GENII- Gap Analsis More Documents & Publications Guidance on GENII computer code - July 6, 2004 Technical Standards, ALOHA-Gap Analysis - May 3, 2004 Technical Standards, MELCOR - Gap Analysis - May 3

134

Fact #610: February 15, 2010 All Sectors' Petroleum Gap | Department...  

Energy Savers (EERE)

10: February 15, 2010 All Sectors' Petroleum Gap Fact 610: February 15, 2010 All Sectors' Petroleum Gap Before 1989 the U.S. produced enough petroleum to meet the needs of the...

135

Fact #688: August 15, 2011 All Sectors' Petroleum Gap | Department...  

Energy Savers (EERE)

8: August 15, 2011 All Sectors' Petroleum Gap Fact 688: August 15, 2011 All Sectors' Petroleum Gap Before 1989 the U.S. produced enough petroleum to meet the needs of the...

136

Substrate-Induced Band-Gap Opening in Epitaxial Graphene  

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

Substrate-Induced Band-Gap Opening in Epitaxial Graphene Substrate-Induced Band-Gap Opening in Epitaxial Graphene Print Wednesday, 26 March 2008 00:00 Prospective challengers to...

137

Planar graphene-narrow-gap semiconductor-graphene heterostructure  

Science Journals Connector (OSTI)

A planar heterostructure composed of two graphene films between which a narrow-gap semiconductor ... paradox is absent when conical points of the graphene Brillouin zone are in the band gap...

P. V. Ratnikov; A. P. Silin

2008-11-01T23:59:59.000Z

138

To Bridge LEDs' Green Gap, Scientists Think Small  

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

To Bridge LEDs' Green Gap, Scientists Think Small To Bridge LEDs' Green Gap, Scientists Think Small Nanostructures Half a DNA Strand-Wide Show Promise for Efficient LEDs April 4,...

139

Substrate-induced band gap opening in epitaxial graphene  

E-Print Network (OSTI)

H.A. Electronic states of graphene nanoribbons studied withS.G. Louie. Energy gaps in graphene nanoribbons. Phys. Rev.band-gap engineering of graphene nanoribbons. Phys. Rev.

2008-01-01T23:59:59.000Z

140

Technical Standards, MACCS2, Gap Analysis - May 3, 2004 | Department...  

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

3, 2004 Technical Standards, MACCS2, Gap Analysis - May 3, 2004 May 3, 2004 Software Quality Assurance Improvement Plan: MACCS2 Gap Analysis The MACCS2 software, for radiological...

Note: This page contains sample records for the topic "optimal gap width" 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

Nonlinear dynamics of Kelvin-Helmholtz instability in a finite-width plasma flow  

SciTech Connect

The nonlinear stage of Kelvin-Helmholtz (KH) instability in a finite-width plane-parallel plasma flow is analyzed. The analysis is performed by means of two-dimensional numerical simulations with the use of ideal magnetohydrodynamic equations describing isothermal plasma flows propagating along the magnetic field. The influence of the magnetic field strength, the plasma temperature, and the ratio of the flow width to the width of the transition layer on the formation of vortex layers and large-scale flow perturbations is investigated. It is shown that, if the wavelength of periodic perturbations is shorter than the flow width, the symmetric and antisymmetric modes develop in a qualitatively similar manner. For waves with wavelengths longer than the flow width, the development of such modes is very different due to the mutual influence of the flow boundaries. Analysis of the development of instability at different values of the Alfven Mach number M{sub A} shows that long-lived vortices with a characteristic scale length on the order of the flow width appear in a weak magnetic field for both symmetric and antisymmetric modes; however, the vortex geometries for these modes are different. In a strong magnetic field, M{sub A} {approx} 5, the phase of vortex decay for both types of modes occurs faster than in a weak field; however, in the case of an antisymmetric mode, large-scale perturbations of the flow boundary are retained for a longer time. Analysis of the evolution of the initial disturbance produced by an ensemble of random small perturbations (noise) at different plasma temperatures shows that, for a flow width comparable with the width of the transition region, the development of KH instability is always antisymmetric in character and leads to well-developed large-scale perturbations of the flow as a whole. For a cold plasma with C{sub S} < 0.5U (where C{sub S} is the speed of sound and U is the flow velocity), in contrast to hot plasma with C{sub S} > 0.5U, the development of KH instability leads to the growth of the antisymmetric mode even if the flow width is much larger than the width of the transition region.

Shevelev, M. M.; Burinskaya, T. M., E-mail: tburinsk@iki.rssi.ru [Russian Academy of Sciences, Space Research Institute (Russian Federation)

2013-06-15T23:59:59.000Z

142

Functional Area Qualification Standard Gap Analysis Qualification Cards  

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

FAQS Gap Analysis Qualification Cards outline the differences between the last and latest version of the FAQ Standard.

143

Carver Performance and Optimization  

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

Optimization Performance and Optimization Performance Monitoring Last edited: 2012-01-09 12:31:03...

144

Intelligent Assistants for Filling Critical Gaps in GIS  

E-Print Network (OSTI)

Intelligent Assistants for Filling Critical Gaps in GIS A Research Program April 1992 David Lanter, Intelligent Assistants for Filling Critical Gaps In GIS, was sponsored by Southern California Edison Company: · An analysis of critical gaps in current geographic information systems (GIS) that impede their use for spatial

California at Santa Barbara, University of

145

Stringent bounds on the brane width from stellar interferometry and distant gamma ray bursts: Back to the hierarchy problem?  

E-Print Network (OSTI)

A simple idea restricting the brane width due to astronomical observations is proposed. Not to contradict the observational data the brane width should be of about Planck size giving therefore strict criterion in selecting the realistic braneworld models.

Michael Maziashvili

2006-07-11T23:59:59.000Z

146

Solar wind suprathermal electron Stahl widths across high-speed stream structures  

SciTech Connect

Suprathermal electrons (100-1500 eV) observed in the solar wind typically show a strahl distribution, that is, a beam directed away from the Sun along the magnetic field direction. The strahl width observed at 1 AU is highly variable, ranging from 10-70 degrees. The obsenred finite width of the strahl results from the competition between beam focusing as the interplanetary magnetic field strength drops with distance from the Sun, and pitch-angle scattering as the beam interacts with the solar wind plasma in transit from the sun. Here we examine strahl width, observed with ACE SWEPAM across high-speed stream structures to investigate variations in electron scattering as a function of local plasma characteristics. We find that narrow strahls (less than 20 degrees wide), indicating reduced scattering, are observed within high-speed streams. Narrow strahls are also observed in both very low temperature solar wind, in association with ICMEs. Case studies of high-speed streams typically show the strahl narrowing at the leading edge of the stream. In some cases, the strahl narrows at the reverse shock or pressure wave, in other cases at the stream interface. The narrowing can either occur discontinuously or gradually over a period of hours. Within the high-speed wind, the strahl remains narrow for a period of hours to days, and then gradually broadens. The strahl width is roughly constant at all energies across these structures. For some fraction of high-speed streams, counterstreaming is associated with passage of the corotating interaction region. In these cases, we find the widths of the two counterstreaming beams frequently differ by more than 40 degrees. This dramatic difference in strahl width contrasts with observations in the solar wind as a whole, in which counterstreaming strahls typically differ in width by less than 20 degrees.

Skoug, Ruth M [Los Alamos National Laboratory; Steinberg, John T [Los Alamos National Laboratory; Goodrich, Katherine A [Los Alamos National Laboratory; Anderson, Brett R [DARTMUTH UNIV.

2011-01-03T23:59:59.000Z

147

Fullerene Formation in Carbon Arc:? Electrode Gap Dependence and Plasma Spectroscopy  

Science Journals Connector (OSTI)

The arc discharge technique is presently considered the most efficient method for the production of fullerene. ... The experiments were carried out in a fullerene arc reactor operating in a semi-continuous fashion, described previously in detail by Huczko et al.20 On the basis of earlier work,20-22 the parameters, ac or dc feeding mode, input power, buffer gas, and pressure, were optimized and electrode gaps between 0.5 and 4 mm were used for dc arcing. ... The interelectrode gap strongly influences the electric properties of the arc and characteristics of generated carbon plasma as well as the radiation level and heat exchange between the plasma and the surrounding high-temperature zone. ...

Andrzej Huczko; Hubert Lange; Przemyslaw Byszewski; Magdalena Poplawska; Andrzej Starski

1997-02-13T23:59:59.000Z

148

Magneto-transport properties of gapped graphene  

Science Journals Connector (OSTI)

Based on the Kubo formula, we have studied the electron transport properties of a gapped graphene in the presence of a strong magnetic field. By solving the Dirac equation, we find that the Landau level spectra in two valleys differ from each other in that the n = 0 level in the K valley is located at top of the valence band, whereas it is at the bottom of the conduction band in the K' valley. Thus, in an individual valley, the symmetry between conduction and valence bands is broken by the presence of a magnetic field. By using the self-consistent Born approximation to treat the long range potential scattering, we formulate the diagonal and the Hall conductivities in terms of the Green function. To perform the numerical calculation, we find that a large bandgap can suppress the quantum Hall effect, owing to the enhancement of the bandgap squeezing the spacing between the low-lying Landau levels. On the other hand, if the bandgap is not very large, the odd integer quantum Hall effect experimentally, observed in the gapless graphene, remains in the gapped one. However, such a result does not indicate the half integer quantum Hall effect in an individual valley of the gapped graphene. This is because the heights of the Hall plateaux in either valley can be continuously tuned by the variation of the bandgap. More interestingly, we find that the height of the diagonal conductivity peak corresponding to the n = 0 Landau level is independent of the bandgap if the scattering is not very strong. In the weak scattering limit, we demonstrate analytically that such a peak takes a universal value e2/(h?), regardless of the bandgap.

Liwei Jiang; Yisong Zheng; Haidong Li; Honghai Shen

2010-01-01T23:59:59.000Z

149

Note On The Maximal Primes Gaps  

E-Print Network (OSTI)

This note presents a result on the maximal prime gap of the form p_(n+1) - p_n 0 is a constant, for any arbitrarily small real number e > 0, and all sufficiently large integer n > n_0. Equivalently, the result shows that any short interval [x, x + y], y => C(log x)^(1+e), contains prime numbers for all sufficiently large real numbers x => x_0 unconditionally. An application demonstrates that a prime p => x > 2 can be determined in deterministic polynomial time O(log(x)^8).

N. A. Carella

2015-02-05T23:59:59.000Z

150

Turbine blade tip gap reduction system  

SciTech Connect

A turbine blade sealing system for reducing a gap between a tip of a turbine blade and a stationary shroud of a turbine engine. The sealing system includes a plurality of flexible seal strips extending from a pressure side of a turbine blade generally orthogonal to the turbine blade. During operation of the turbine engine, the flexible seal strips flex radially outward extending towards the stationary shroud of the turbine engine, thereby reducing the leakage of air past the turbine blades and increasing the efficiency of the turbine engine.

Diakunchak, Ihor S.

2012-09-11T23:59:59.000Z

151

Ideal Soliton Environment Using Parametric Band Gaps  

Science Journals Connector (OSTI)

Simultaneous solitary wave solutions for laser propagation in nonlinear parametric media with up to ( 3+1) dimensions are proved to exist. The combination of the large dispersion of a Bragg grating and the strong nonlinearity of ?(2) optical material results in stable behavior with short interaction distances and low power requirements. The solutions are obtained by using the effective mass approximation to reduce the coupled propagation equations to those describing a dispersive parametric nonlinear waveguide, and are verified by solving the complete set of coupled band-gap equations numerically.

H. He and P. D. Drummond

1997-06-09T23:59:59.000Z

152

Doping-dependent anisotropic superconducting gap in Na1-?(Fe1-xCox)As from London penetration depth  

SciTech Connect

The London penetration depth was measured in single crystals of self-doped Na1-?FeAs (from under doping to optimal doping, Tc from 14 to 27 K) and electron-doped Na(Fe1-xCox)As with x ranging from undoped, x=0, to overdoped, x=0.1. In all samples, the low-temperature variation of the penetration depth exhibits a power-law dependence, ??(T)=ATn, with the exponent that varies in a domelike fashion from n˜1.1 in the underdoped, reaching a maximum of n˜1.9 in the optimally doped, and decreasing again to n˜1.3 on the overdoped side. While the anisotropy of the gap structure follows a universal domelike evolution, the exponent at optimal doping, n˜1.9, is lower than in other charge-doped Fe-based superconductors (FeSCs). The full-temperature range superfluid density, ?s(T)=?(0)/?(T)2, at optimal doping is also distinctly different from other charge-doped FeSCs but is similar to isovalently substituted BaFe2(As1-xPx)2, believed to be a nodal pnictide at optimal doping. These results suggest that the superconducting gap in Na(Fe1-xCox)As is highly anisotropic even at optimal doping.

Cho, Kyuil; Tanatar, Makariy A.; Spyrison, Nicholas; Kim, Hyunsoo; Song, Y.; Dai, Pengcheng; Zhang, C.L.; Prozorov, Ruslan

2012-07-30T23:59:59.000Z

153

Nano-scaled graphene platelets with a high length-to-width aspect ratio  

DOE Patents (OSTI)

This invention provides a nano-scaled graphene platelet (NGP) having a thickness no greater than 100 nm and a length-to-width ratio no less than 3 (preferably greater than 10). The NGP with a high length-to-width ratio can be prepared by using a method comprising (a) intercalating a carbon fiber or graphite fiber with an intercalate to form an intercalated fiber; (b) exfoliating the intercalated fiber to obtain an exfoliated fiber comprising graphene sheets or flakes; and (c) separating the graphene sheets or flakes to obtain nano-scaled graphene platelets. The invention also provides a nanocomposite material comprising an NGP with a high length-to-width ratio. Such a nanocomposite can become electrically conductive with a small weight fraction of NGPs. Conductive composites are particularly useful for shielding of sensitive electronic equipment against electromagnetic interference (EMI) or radio frequency interference (RFI), and for electrostatic charge dissipation.

Zhamu, Aruna (Centerville, OH); Guo, Jiusheng (Centerville, OH); Jang, Bor Z. (Centerville, OH)

2010-09-07T23:59:59.000Z

154

Extended Supersymmetry in Gapped and Superconducting Graphene  

E-Print Network (OSTI)

In view of the many quantum field theoretical descriptions of graphene in $2+1$ dimensions, we present another field theoretical feature of graphene, in the presence of defects. Particularly, we shall be interested in gapped graphene in the presence of a domain wall and also for superconducting graphene in the presence of a vortex. As we explicitly demonstrate, the gapped graphene electrons that are localized on the domain wall are associated with four $N=2$ one dimensional supersymmetries, with each pair combining to form an extended $N=4$ supersymmetry with non-trivial topological charges. The case of superconducting graphene is more involved, with the electrons localized on the vortex being associated with $n$ one dimensional supersymmetries, which in turn combine to form an $N=2n$ extended supersymmetry with no-trivial topological charges. As we shall prove, all supersymmetries are unbroken, a feature closely related to the number of the localized fermions and also to the exact form of the associated oper...

Oikonomou, V K

2014-01-01T23:59:59.000Z

155

Extended Supersymmetry in Gapped and Superconducting Graphene  

E-Print Network (OSTI)

In view of the many quantum field theoretical descriptions of graphene in $2+1$ dimensions, we present another field theoretical feature of graphene, in the presence of defects. Particularly, we shall be interested in gapped graphene in the presence of a domain wall and also for superconducting graphene in the presence of a vortex. As we explicitly demonstrate, the gapped graphene electrons that are localized on the domain wall are associated with four $N=2$ one dimensional supersymmetries, with each pair combining to form an extended $N=4$ supersymmetry with non-trivial topological charges. The case of superconducting graphene is more involved, with the electrons localized on the vortex being associated with $n$ one dimensional supersymmetries, which in turn combine to form an $N=2n$ extended supersymmetry with no-trivial topological charges. As we shall prove, all supersymmetries are unbroken, a feature closely related to the number of the localized fermions and also to the exact form of the associated operators. In addition, the corresponding Witten index is invariant under compact and odd perturbations.

V. K. Oikonomou

2014-11-30T23:59:59.000Z

156

Matlab-based Optimization: Optimization Toolbox  

E-Print Network (OSTI)

Matlab-based Optimization: the Optimization Toolbox Gene Cliff (AOE/ICAM - ecliff@vt.edu ) 3:00pm Engineering ICAM: Interdisciplinary Center for Applied Mathematics 1 / 37 #12;Matlab's Optimization Toolbox;Matlab's Optimization Toolbox Classifying Optimization Problems A Soup Can Example Intermezzo

Crawford, T. Daniel

157

Fuzzy Optimality and Evolutionary Multiobjective Optimization  

E-Print Network (OSTI)

Fuzzy Optimality and Evolutionary Multiobjective Optimization M. Farina and P. Amato. Pareto optimality is someway ineffective for optimization problems with several (more than three) objectives. In fact the Pareto optimal set tends to become a wide portion of the whole design domain search

Coello, Carlos A. Coello

158

Partial decay widths of negative parity baryons in the 1/N{sub c} expansion  

SciTech Connect

The partial decay widths of lowest lying negative parity baryons belonging to the 70-plet of SU(6) are analyzed in the framework of the 1/N{sub c} expansion. The channels considered are those with single pseudoscalar meson emission. The analysis is carried out to sub-leading order in 1/N{sub c} and to first order in SU(3) symmetry breaking. Conclusions about the magnitude of SU(3) breaking effects along with predictions for some unknown or poorly determined partial decay widths of known resonances are given.

Gonzalez de Urreta, E. J. [Physics Department, Centro Atomico Constituyentes, CNEA, Argentina, CONICET, Rivadavia 1917, 1033 Buenos Aires (Argentina); Scoccola, N. N. [Physics Department, Centro Atomico Constituyentes, CNEA, Argentina, CONICET, Rivadavia 1917, 1033 Buenos Aires, Argentina. and Universidad Favaloro, Solis 453, 1078 Buenos Aires (Argentina); Jayalath, C. P. [Department of Physics, Hampton University, Hampton, VA 23668 (United States); Thomas Jefferson National Accelerator Facility, Newport News, VA 23606 (United States) and Department of Physics, Peradeniya University, Peradeniya (20400) (Sri Lanka); Goity, J. L. [Department of Physics, Hampton University, Hampton, VA 23668 (United States); Thomas Jefferson National Accelerator Facility, Newport News, VA 23606 (United States)

2013-03-25T23:59:59.000Z

159

Partial Decay Widths of Negative Parity Baryons in the 1/N{sub c} Expansion  

SciTech Connect

The partial decay widths of lowest lying negative parity baryons belonging to the 70-plet of SU(6) are analyzed in the framework of the 1/N{sub c} expansion. The channels considered are those with single pseudoscalar meson emission. The analysis is carried out to sub-leading order in 1/N{sub c} and to first order in SU(3) symmetry breaking. Conclusions about the magnitude of SU(3) breaking effects along with predictions for some unknown or poorly determined partial decay widths of known resonances are given.

Gonzalez de Urreta, Emiliano [CNEA, Buenos Aires; Scoccola, Norberto [CNEA, Buenos Aires; Jayalath, Chandala [JLAB, Hampton U.; Goity, Jose [JLAB, Hampton U.

2013-04-01T23:59:59.000Z

160

Pseudogap and Superconducting Gap in High-Temperature Superconductors  

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

Pseudogap and Superconducting Gap in Pseudogap and Superconducting Gap in High-Temperature Superconductors Two decades after the discovery of first high temperature superconductors, the microscopic mechanism of high-Tc superconductivity remains elusive. In conventional superconductors, it has been well established that electrons form so-called "Cooper pairs" to give rise to superconductivity. The pair binding manifests itself as an energy gap in many spectroscopic measurements. This energy gap, known as superconducting gap, appears at the superconducting transition temperature Tc where the resistance also vanishes. For high temperature superconductors, the story is more complicated. Over a wide region of compositions and temperatures, there exists an energy gap well above Tc. This energy gap is called pseudogap [1], because there is no direct correlation to the superconducting transition. The origin of this pseudogap and its relation to the superconducting gap are believed to hold the key for understanding the mechanism of high-Tc superconductivity - one of the outstanding problems in condensed matter physics. In this regard, researchers Kiyohisa Tanaka and Wei-Sheng Lee, along with their co-workers in Prof. Zhi-Xun Shen's group at Stanford University, have recently made an important discovery about the coexistence of two distinct energy gaps that have opposite doping dependence. Their observation not only provides a natural explanation for the contradictory results about the superconducting gap deduced from different experimental techniques, but also has profound implications on the mechanism of high-Tc superconductivity.

Note: This page contains sample records for the topic "optimal gap width" 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

Arc voltage distribution skewness as an indicator of electrode gap during vacuum arc remelting  

DOE Patents (OSTI)

The electrode gap of a VAR is monitored by determining the skewness of a distribution of gap voltage measurements. A decrease in skewness indicates an increase in gap and may be used to control the gap. 4 figs.

Williamson, R.L.; Zanner, F.J.; Grose, S.M.

1998-01-13T23:59:59.000Z

162

OPTIMIZING YOUR  

E-Print Network (OSTI)

Electric motor-driven systems are estimated to consume over half of all electricity in the United States and over 70 % of all electricity in many industrial plants. This fact sheet presents an overview of electric drive systems and highlights common ways you can improve system efficiency and reliability. By optimizing the efficiency of your motor-driven systems, you can increase productivity while saving significant amounts of energy and money.

unknown authors

163

Uncertainties Associated with Theoretically Calculated N2-Broadened Half-Widths of H2O Lines  

E-Print Network (OSTI)

to be calculated theoretically. The accuracy of these calculated values depends on many factors such as the line-shape1 Uncertainties Associated with Theoretically Calculated N2- Broadened Half-Widths of H2O Lines Q-offs used in the theoretical calculations, we have carried out extensive numerical calculations of the N2

Gamache, Robert R.

164

Prediction of reinforcement corrosion using corrosion induced cracks width in corroded reinforced concrete beams  

SciTech Connect

This paper studies the evolution of reinforcement corrosion in comparison to corrosion crack width in a highly corroded reinforced concrete beam. Cracking and corrosion maps of the beam were drawn and steel reinforcement was recovered from the beam to observe the corrosion pattern and to measure the loss of mass of steel reinforcement. Maximum steel cross-section loss of the main reinforcement and average steel cross-section loss between stirrups were plotted against the crack width. The experimental results were compared with existing models proposed by Rodriguez et al., Vidal et al. and Zhang et al. Time prediction models for a given opening threshold are also compared to experimental results. Steel cross-section loss for stirrups was also measured and was plotted against the crack width. It was observed that steel cross-section loss in the stirrups had no relationship with the crack width of longitudinal corrosion cracks. -- Highlights: •Relationship between crack and corrosion of reinforcement was investigated. •Corrosion results of natural process and then corresponds to in-situ conditions. •Comparison with time predicting model is provided. •Prediction of load-bearing capacity from crack pattern was studied.

Khan, Inamullah; François, Raoul [Université de Toulouse, UPS, INSA, LMDC (Laboratoire Matériaux et Durabilité des Constructions), 135, Avenue de Rangueil, F-31077 Toulouse (France)] [Université de Toulouse, UPS, INSA, LMDC (Laboratoire Matériaux et Durabilité des Constructions), 135, Avenue de Rangueil, F-31077 Toulouse (France); Castel, Arnaud [Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW (Australia)] [Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW (Australia)

2014-02-15T23:59:59.000Z

165

Dielectron widths of the Upsilon(1S,2S,3S) resonances  

E-Print Network (OSTI)

We determine the dielectron widths of the Upsilon(1S), Upsilon(2S), and Upsilon(3S) resonances with better than 2% precision by integrating the cross section of e(+)e(-)->Upsilon over the e(+)e(-) center-of-mass energy. Using e(+)e(-) energy scans...

Besson, David Zeke

2006-03-01T23:59:59.000Z

166

Report of the working group on precision measurements - measurements of the W boson mass and width.  

SciTech Connect

We discuss the prospects for measuring the W mass and width in Run II. The basic techniques used to measure M{sub W} are described and the statistical, theoretical and detector-related uncertainties are discussed in detail. Alternative methods of measuring the W mass at the Tevatron and the prospects for M{sub W} measurements at other colliders are also described.

Brock, R.; Erler, J.; Kim, Y.-K.; Marciano, W.; Ashmanskas, W.; Baur, U.; Ellison, J.; Lancaster, M.; Nodulman, L.; Rha, J.; Waters, D.; Womersley, J.

2000-11-29T23:59:59.000Z

167

A Scalable Decision Procedure for Fixed-Width Bit-Vectors Roberto Bruttomesso  

E-Print Network (OSTI)

A Scalable Decision Procedure for Fixed-Width Bit-Vectors Roberto Bruttomesso Università della Svizzera Italiana Lugano, Switzerland natasha.sharygina@usi.ch ABSTRACT Efficient decision procedures procedure for the core theory of bit-vectors that exploits a reduction to equality reasoning. The proce

Sharygina, Natasha

168

Search for Invisibly Decaying Higgs Bosons with Large Decay Width Using the OPAL Detector at LEP  

E-Print Network (OSTI)

This paper describes a topological search for an invisibly decaying Higgs boson,H, produced via the Bjorken process (e+e- -> HZ). The analysis is based on data recorded using the OPAL detector at LEP at centre-of-mass energies from 183 to 209 GeV corresponding to a total integrated luminosity of 629pb-1. In the analysis only hadronic decays of the Z boson are considered. A scan over Higgs boson masses from 1 to 120 GeV and decay widths from 1 to 3000 GeV revealed no indication for a signal in the data. From a likelihood ratio of expected signal and Standard Model background we determine upper limits on cross-section times branching ratio to an invisible final state. For moderate Higgs boson decay widths, these range from about 0.07pb Mh = 60GeV) to 0.57pb (Mh = 114GeV). For decay widths above 200GeV the upper limits are of the order of 0.15pb. The results can be interpreted in general scenarios predicting a large invisible decay width of the Higgs boson. As an example we interpret the results in the so-called stealthy Higgs scenario. The limits from this analysis exclude a large part of the parameter range of this scenario experimentally accessible at LEP2.

The OPAL collaboration

2006-10-18T23:59:59.000Z

169

Mesh Width Influences Prey Retention in Spider Orb Webs Todd A. Blackledge & Jacquelyn M. Zevenbergen  

E-Print Network (OSTI)

Mesh Width Influences Prey Retention in Spider Orb Webs Todd A. Blackledge & Jacquelyn M. Zevenbergen Department of Biology, The University of Akron, Akron, OH, USA Introduction Orb webs depend upon threads, the sticky spirals of orb webs perform two important functions during prey cap- ture. First

Blackledge, Todd

170

Digitally Controlled Wide Range Pulse Width Modulator for On-Chip Power Supplies  

E-Print Network (OSTI)

of the inverters This research is supported in part by the New York State Office of Science, TechnologyDigitally Controlled Wide Range Pulse Width Modulator for On-Chip Power Supplies Selc¸uk K Rochester, New York 14627 fvaisband, friedmang@ece.rochester.edu Abstract-- A digitally controlled current

Friedman, Eby G.

171

Optimization Online - Global Optimization Submissions - 2014  

E-Print Network (OSTI)

Zhao Sun. February 2014. Global optimization on the torus, the sphere and the rotation ... RBFOpt: an open-source library for black-box optimization with costly ...

172

Structural organization of gap junction channels  

Science Journals Connector (OSTI)

Gap junctions were initially described morphologically, and identified as semi-crystalline arrays of channels linking two cells. This suggested that they may represent an amenable target for electron and X-ray crystallographic studies in much the same way that bacteriorhodopsin has. Over 30 years later, however, an atomic resolution structural solution of these unique intercellular pores is still lacking due to many challenges faced in obtaining high expression levels and purification of these structures. A variety of microscopic techniques, as well as NMR structure determination of fragments of the protein, have now provided clearer and correlated views of how these structures are assembled and function as intercellular conduits. As a complement to these structural approaches, a variety of mutagenic studies linking structure and function have now allowed molecular details to be superimposed on these lower resolution structures, so that a clearer image of pore architecture and its modes of regulation are beginning to emerge.

Gina E. Sosinsky; Bruce J. Nicholson

2005-01-01T23:59:59.000Z

173

Software Quality Assurance Improvment Plan: CFAST Gap Analysis, Final Report  

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

EH-4.2.1.3-CFAST-Gap Analysis EH-4.2.1.3-CFAST-Gap Analysis Defense Nuclear Facilities Safety Board Recommendation 2002-1 Software Quality Assurance Improvement Plan Commitment 4.2.1.3: Software Quality Assurance Improvement Plan: CFAST Gap Analysis Final Report U.S. Department of Energy Office of Environment, Safety and Health 1000 Independence Ave., S.W. Washington, DC 20585-2040 May 2004 CFAST Gap Analysis May 2004 Final Report ii INTENTIONALLY BLANK CFAST Gap Analysis May 2004 Final Report iii FOREWORD This report documents the outcome of an evaluation of the Software Quality Assurance (SQA) attributes of the CFAST computer code for accident analysis applications, relative to established requirements. This evaluation, a "gap analysis," is performed to meet commitment 4.2.1.3 of the Department of Energy's

174

Technical Standards, MELCOR - Gap Analysis - May 3, 2004 | Department of  

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

MELCOR - Gap Analysis - May 3, 2004 MELCOR - Gap Analysis - May 3, 2004 Technical Standards, MELCOR - Gap Analysis - May 3, 2004 May 3, 2004 Software Quality Assurance Improvement Plan: MELCOR Gap Analysis This report documents the outcome of an evaluation of the Software Quality Assurance (SQA) attributes of the MELCOR computer code for leak path factor applications, relative to established software requirements. This evaluation, a "gap analysis," is performed to meet Commitment 4.2.1.3 of the Department of Energy's Implementation Plan to resolve SQA issues identified in the Defense Nuclear Facilities Safety Board Recommendation 2002-1. Technical Standards, MELCOR - Gap Analysis More Documents & Publications Technical Standards, Guidance on MELCOR computer code - May 3, 2004

175

Advanced Review Geometry optimization  

E-Print Network (OSTI)

Advanced Review Geometry optimization H. Bernhard Schlegel Geometry optimization is an important part of most quantum chemical calcu- lations. This article surveys methods for optimizing equilibrium geometries, lo- cating transition structures, and following reaction paths. The emphasis is on optimizations

Schlegel, H. Bernhard

176

Optimization Jason Courter  

E-Print Network (OSTI)

Optimization Jason Courter Foundations of Ecology #12;What is optimization? Maximization Minimization Optimization Natural Selection 1. Variation 2. Heritable Variation 3. Differential Reproduction #12;On Optimal use of a Patchy Environment · Robert MacArthur · Eric Pianka http

Jodice, Patrick

177

Optimizing the Aerodynamic Efficiency of IM Freight Trains  

E-Print Network (OSTI)

Optimizing the Aerodynamic Efficiency of IM Freight Trains Yung-Cheng Lai University of Illinois aerodynamic penalties and fuel consumption than general trains IM trains suffer from their equipment design and loading pattern These large gaps directly affect the aerodynamic drag of the train. This effect is greater

Barkan, Christopher P.L.

178

Effects of Out-of-Plane Disorder on the Nodal Quasiparticle and Superconducting Gap in Single-Layer Bi_2Sr_1.6Ln_0.4CuO_6 delta (Ln = La, Nd, Gd)  

SciTech Connect

How out-of-plane disorder affects the electronic structure has been investigated for the single-layer cuprates Bi{sub 2}Sr{sub 1.6}Ln{sub 0.4}CuO{sub 6+{delta}} (Ln = La, Nd, Gd) by angle-resolved photoemission spectroscopy. We have observed that, with increasing disorder, while the Fermi surface shape and band dispersions are not affected, the quasi-particle width increases, the anti-nodal gap is enhanced and the superconducting gap in the nodal region is depressed. The results indicate that the superconductivity is significantly depressed by out-of-plane disorder through the enhancement of the anti-nodal gap and the depression of the superconducting gap in the nodal region.

Hashimoto, M.

2011-01-04T23:59:59.000Z

179

Two-gap elliptic solutions of the Boussinesq equation  

SciTech Connect

Two-gap solutions of the Boussinesq equation are considered. It is shown that for almost every Riemann surface {gamma} of genus g=2 covering the elliptic surface it is possible to construct an elliptic (in x) two-gap solution of the Boussinesq equation. The existence of third- and fourth-order differential operators with elliptic 'two-gap' potentials having an arbitrary number of poles is also established. An example is given.

Smirnov, A O [Saint-Petersburg State University of Aerospace Instrumentation, Saint-Petersburg (Russian Federation)

1999-06-30T23:59:59.000Z

180

Sensitivity Analysis of the Gap Heat Transfer Model in BISON.  

SciTech Connect

This report summarizes the result of a NEAMS project focused on sensitivity analysis of the heat transfer model in the gap between the fuel rod and the cladding used in the BISON fuel performance code of Idaho National Laboratory. Using the gap heat transfer models in BISON, the sensitivity of the modeling parameters and the associated responses is investigated. The study results in a quantitative assessment of the role of various parameters in the analysis of gap heat transfer in nuclear fuel.

Swiler, Laura Painton; Schmidt, Rodney C.; Williamson, Richard (INL); Perez, Danielle (INL)

2014-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "optimal gap width" 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

Optimization Online - Digest Archive  

E-Print Network (OSTI)

Optimization Online Digest Archive. Subscribe to the digest. ... Online is supported by the Mathematical Optmization Society. Mathematical Optimization Society.

182

Optimization Online - Category Archive  

E-Print Network (OSTI)

Optimization Online. Browse Submissions By Area. Linear, Cone and Semidefinite ... Optimization Online is supported by the Mathematical Optmization Society.

183

Optimization Online - Coordinators  

E-Print Network (OSTI)

Optimization Online submissions are electronically handled by a team of ... OR and Management Sciences / Integer Programming / Robust Optimization ...

184

Optimization Online - Category Archive  

E-Print Network (OSTI)

Optimization Online. Browse Submissions By Area. Nonlinear Optimization. 2000 · 2001 · 2002 · 2003 · 2004 · 2005 · 2006 · 2007 · 2008 · 2009 · 2010 · 2011 ...

185

Optimal Energy Systems | Open Energy Information  

Open Energy Info (EERE)

Optimal Energy Systems Optimal Energy Systems Jump to: navigation, search Name Optimal Energy Systems Place Torrance, California Zip 90505 Product Manufacturer of flywheel power system, specialising in aerospace and defence sector. Coordinates 40.417285°, -79.223959° 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":40.417285,"lon":-79.223959,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

186

Combined Heat and Power: Connecting the Gap between Markets and...  

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

Combined Heat and Power: Connecting the Gap between Markets and Utility Interconnection and Tariff Practices (Part I) Susanne Brooks, Brent Elswick, and R. Neal Elliott March 2006...

187

To Bridge LEDs' Green Gap, Scientists Think Small  

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

emitting diodes (LEDs), especially in the "green gap," a portion of the spectrum where LED efficiency plunges, simulations at the U.S. Department of Energy's National Energy...

188

FAQS Gap Analysis Qualification Card – Civil Structural Engineering  

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

Functional Area Qualification Standard Gap Analysis Qualification Cards outline the differences between the last and latest version of the FAQ Standard.

189

Substrate-Induced Band-Gap Opening in Epitaxial Graphene  

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

Substrate-Induced Band-Gap Opening in Epitaxial Graphene Print Prospective challengers to silicon, the long-reigning king of semiconductors for computer chips and other electronic...

190

FAQS Gap Analysis Qualification Card - Technical Training | Department...  

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

Description Technical Training Gap Analysis Qualification Card More Documents & Publications DOE-STD-1179-2004 DOE-HDBK-1078-94 FAQS Reference Guide - Technical Training...

191

Catalysis by Design: Bridging the Gap between Theory and Experiments...  

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

between Theory and Experiments Catalysis by Design: Bridging the Gap between Theory and Experiments Poster presentation at the 2007 Diesel Engine-Efficiency & Emissions Research...

192

FAQS Gap Analysis Qualification Card – Nuclear Safety Specialist  

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

Functional Area Qualification Standard Gap Analysis Qualification Cards outline the differences between the last and latest version of the FAQ Standard.

193

Information Gap Decision Theory based OPF with HVDC Connected ...  

E-Print Network (OSTI)

curve as well as the uncertainties of wind power generation. Information gap .... its own advantages and disadvantages, which are summarized as follows.

2014-12-01T23:59:59.000Z

194

Method for Creating Photonic Band Gap Materials - Energy Innovation...  

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

a photonic band gap. These microstructures have the potential to change the way optoelectronic devices, such as photodiodes, LEDs, and integrated optical circuit elements, are...

195

Minding the Gap Makes for More Efficient Solar Cells  

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

properties of these materials go through a dramatic change that makes them ideal for solar energy applications. These materials can go from indirect band gap semiconductors to...

196

Optimization of a photovoltaic pumping system based on the optimal control theory  

SciTech Connect

This paper suggests how an optimal operation of a photovoltaic pumping system based on an induction motor driving a centrifugal pump can be realized. The optimization problem consists in maximizing the daily pumped water quantity via the optimization of the motor efficiency for every operation point. The proposed structure allows at the same time the minimization the machine losses, the field oriented control and the maximum power tracking of the photovoltaic array. This will be attained based on multi-input and multi-output optimal regulator theory. The effectiveness of the proposed algorithm is described by simulation and the obtained results are compared to those of a system working with a constant air gap flux. (author)

Betka, A.; Attali, A. [Laboratoire de Genie Electrique de Biskra (LGEB), Electrical Engineering Department, University of Biskra (Algeria)

2010-07-15T23:59:59.000Z

197

Derivative Free Optimization Methods for Optimizing Stirrer ...  

E-Print Network (OSTI)

It also gives a comparison of the two optimization algorithms. Key words: Energy, Numerical Optimization, Derivative-Free Optimization,. Computational Fluid ... numerical simulations are needed for the computation of the fluid flow inside the stirrer for ..... Optimization Methods and Software, 20 (2005) 493-508. [6] A. R. Conn ...

2007-02-01T23:59:59.000Z

198

Optimization Online - Nonlinear Optimization Submissions - 2014  

E-Print Network (OSTI)

Unconstrained Optimization Generalized Inexact Proximal Algorithms: Habit's/ Routine's Formation with Resistance to Change, following Worthwhile Changes

199

Neutron reflectometry characterization of interface width between sol-gel titanium dioxide and silicon dioxide thin films  

SciTech Connect

Neutron reflectometry (NR) was used to directly measure the interface width between a titanium dioxide and a silicon dioxide film deposited by sol-gel processing. In a bilayer heated to 450 C, NR measurements showed that the interface width is 0.8 nm. This width is the same as the roughness of a sol-gel silicon dioxide surface after the same heat treatment, suggesting no interdiffusion or mixing at the bilayer interface.

Keddie, J.L.; Norton, L.J.; Kramer, E.J.; Giannelis, E.P. (Cornell Univ., Ithaca, NY (United States). Dept. of Materials Science and Engineering)

1993-10-01T23:59:59.000Z

200

Roughening, deroughening, and nonuniversal scaling of the interface width in electrophoretic deposition of polymer chains  

E-Print Network (OSTI)

Growth and roughness of the interface of deposited polymer chains driven by a field onto an impenetrable adsorbing surface are studied by computer simulations in (2+1) dimensions. The evolution of the interface width W shows a crossover from short-time growth described by the exponent beta1 to a long-time growth with exponent beta2 (>beta1). The saturated width increases, i.e., the interface roughens, with the molecular weight Lc, but the roughness exponent alpha (from Ws~L^alpha) becomes negative in contrast to models for particle deposition; alpha depends on the chain length--a nonuniversal scaling with the substrate length L. Roughening and deroughening occur as the field E and the temperature T compete such that Ws=(A+BT)E^-1/2.

Frank W. Bentrem; R. B. Pandey; Fereydoon Family

2006-07-03T23:59:59.000Z

Note: This page contains sample records for the topic "optimal gap width" 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

Experimental Width Shift Distribution: A Test of Nonorthogonality for Local and Global Perturbations  

Science Journals Connector (OSTI)

The change of resonance widths in an open system under a perturbation of its interior has been recently introduced by Fyodorov and Savin [Phys. Rev. Lett. 108, 184101 (2012)] as a sensitive indicator of the nonorthogonality of resonance states. We experimentally study universal statistics of this quantity in weakly open two-dimensional microwave cavities and reverberation chambers realizing scalar and electromagnetic vector fields, respectively. We consider global as well as local perturbations, and also extend the theory to treat the latter case. The influence of the perturbation type on the width shift distribution is more pronounced for many-channel systems. We compare the theory to experimental results for one and two attached antennas and to numerical simulations with higher channel numbers, observing a good agreement in all cases.

J.-B. Gros; U. Kuhl; O. Legrand; F. Mortessagne; E. Richalot; D.?V. Savin

2014-11-26T23:59:59.000Z

202

Invisible Higgs in weak bosons associative production with heavy quarks at LHC: probing mass and width  

E-Print Network (OSTI)

New physics coupled to the Higgs boson may hide it in the standard decay channels to be investigated at LHC. We consider the models where new invisible dominant decay modes of the Higgs boson are responsible for this hiding. We propose to study at LHC the weak boson production associated with heavy quarks: our analysis revealed that boson pair invariant mass distribution is sensitive to both mass and width of the invisible Higgs boson, if it is not too far from the weak boson pair threshold. We present tree-level results for the most relevant cases of top quarks and of bottom quarks in Standard Model extensions with large $b$-quark Yukawa coupling. We argue that QCD corrections do not spoil these results allowing for unambiguous extraction of the Higgs boson mass and width from the analysis of large enough amount of data.

E. E. Boos; S. V. Demidov; D. S. Gorbunov

2010-10-26T23:59:59.000Z

203

Neutron and gamma width correlations in neutron capture reactions: A comparative study  

Science Journals Connector (OSTI)

Three different procedures are generally adopted in the analysis of correlation observed between neutron and ? widths in neutron capture experiments. We present a quantitative comparison of the three methods, the valence model, optical model, and shell model with an "exact" calculation including core excitation effects. The Sn28(n, ?) reaction is taken as an example which demonstrates that the approximation used for the single particle amplitudes and the omission of core excitation effects are possible sources of error in conventional calculations. Among the conventional procedures we conclude that because of possible external region contributions and its lack of sensitivity to the potential used, the optical model formulation of Lane and Mughabgab represent the most useful alternative.NUCLEAR REACTIONS (?, ?) reaction, neutron and ? width correlation.

D. Halderson and B. Castel

1978-09-01T23:59:59.000Z

204

PoS(EPS-HEP2013)326 Measurement of the ratio of the leptonic widths  

E-Print Network (OSTI)

PoS(EPS-HEP2013)326 Measurement of the ratio of the leptonic widths ee/µµ for the J/ V. M. The European Physical Society Conference on High Energy Physics EPS-HEP2013 18-24 July 2013 Stockholm, Sweden-NonCommercial-ShareAlike Licence. http://pos.sissa.it/ #12;PoS(EPS-HEP2013)326 ee(J/)/µµ (J/) measurement E. M. Baldin 1 2 3 4 5 6

205

Potential Precision on Higgs Couplings and Total Width at the ILC  

E-Print Network (OSTI)

We outline a systematic approach to the determination of the Standard Model-like Higgs boson total width and measurable coupling parameters in a model-independent manner at the International Linear Collider (ILC) and illustrate the complementarity for operating the ILC at $250$ GeV near the $Zh$ threshold and at $500$ GeV and $1$ TeV utilizing the $WW, ZZ$ fusion processes. We perform detailed simulations for an important contributing channel to the coupling determination and for invisible decays. Without model assumptions, and combining the information for the coupling ratios from the LHC, the total width can be determined to an accuracy of about $6%$, and the couplings for the observable channels can be measured to the $(3-5)%$ level at 250 GeV, reaching $(1-3)%$ level including the 500 GeV results, with further improvements possible with a $1$ TeV run. The best precision for the branching fraction measurement of the Higgs to invisible modes can be reached at $0.5-0.7%$ around the $Zh$ threshold. Further studies from $ZZ$ fusion at higher energies may provide significant improvement for the measurements. With modest theory assumptions, the width and coupling determinations can be further improved to the percent or sub-percent level.

Tao Han; Zhen Liu; Josh Sayre

2013-11-27T23:59:59.000Z

206

INFLUENCE OF DOPPLER WIDTH FLUCTUATIONS ON THE SHAPE OF SPECTRAL LINES  

SciTech Connect

We investigate the influence of stochastic Doppler width fluctuations on the shape of spectral lines. The photospheres and atmospheres of stars, and the interstellar medium, possess stochastic behavior especially near nonstationary objects such as active galactic nuclei, quasars, flare stars, and regions of star formation. In reality, we observe the mean values of intensities from these objects. In most situations, the spectral line extinction coefficient has a Gaussian shape with the stochastic Doppler width determined by thermal and small-scale turbulent motions of atoms or molecules. For small-scale turbulent motions (short-correlated turbulence) the propagation of radiation is described by the average extinction factor. This coefficient depends on the level of the Doppler width fluctuations {eta}. We show that these fluctuations change both the value of intensity and the shape of spectral lines. We consider distortions of the spectral line shapes for the absorption and emission lines for various values of the parameter {eta}. For a number of H{sub 2}O maser sources we estimate the values of this parameter, the optical depths of the inverted media, and the mean effective Doppler velocities. Maser emission lines with non-Gaussian shape can serve as an additional method for the investigation of the physical parameters in maser 'spots'.

Silant'ev, N. A.; Lekht, E. E. [Instituto Nacional de AstrofIsica, Optica y Electronica, Apartado Postal 51 y 216, 72840, Tonantzintla, Puebla (Mexico); Alexeeva, G. A. [Central (Pulkovo) Astronomical Observatory of Russian Academy of Sciences, Pulkovskoe shosse 65, St. Petersburg, 196140 (Russian Federation)], E-mail: silant@inaoep.mx

2009-05-10T23:59:59.000Z

207

Electronic materials with a wide band gap: recent developments  

Science Journals Connector (OSTI)

Usually, semiconductors with a band gap Eg 3 eV or larger are called wide band gap materials. Their optical emission can span the whole of the visible spectrum, enabling the development of devices for solid-state lighting. In addition, a large Eg results in a high electrical breakthrough field, which is interesting for high-power electronics.

Klimm, D.

2014-08-29T23:59:59.000Z

208

Rural Microfinance Service Delivery: Gaps, Inefficiencies and Emerging Solutions  

E-Print Network (OSTI)

Rural Microfinance Service Delivery: Gaps, Inefficiencies and Emerging Solutions Tapan S. Parikh emerged as one of the most promising avenues for stimulating rural economic devel- opment through local enterprise. In this paper we will discuss some of the major technology gaps faced by rural microfinance

Parikh, Tapan S.

209

ERDC/CERLTR-05-38 Determining Research Gaps  

E-Print Network (OSTI)

ERDC/CERLTR-05-38 Determining Research Gaps in Disturbance Data for Fort Bliss and a Conceptual-38 November 2005 Determining Research Gaps in Disturbance Data for Fort Bliss and a Conceptual Model Tamara Bliss #12;ABSTRACT Numerous research and outside monitoring efforts have been completed for Fort Bliss

Fehmi, Jeffrey S.

210

Substrate-Induced Band-Gap Opening in Epitaxial Graphene  

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

Substrate-Induced Band-Gap Opening in Epitaxial Graphene Print Substrate-Induced Band-Gap Opening in Epitaxial Graphene Print Prospective challengers to silicon, the long-reigning king of semiconductors for computer chips and other electronic devices, have to overcome silicon's superb collection of materials properties as well as sophisticated fabrication technologies refined by six decades of effort by materials scientists and engineers. Graphene, one of the latest contenders, has a rather impressive list of features of its own but has lacked a key characteristic of all semiconductors, an energy gap (band gap) in its electronic band structure. A multi-institutional collaboration under the leadership of researchers with Berkeley Lab and the University of California, Berkeley, have now demonstrated that growing an epitaxial film of graphene on a silicon carbide substrate results in a significant band gap, 0.26 electron volts (eV), an important step toward making graphene useful as a semiconductor.

211

Review of Used Nuclear Fuel Storage and Transportation Technical Gap  

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

Analysis Analysis Review of Used Nuclear Fuel Storage and Transportation Technical Gap Analysis While both wet and dry storage have been shown to be safe options for storing used nuclear fuel (UNF), the focus of the program is on dry storage of commercial UNF at reactor or centralized locations. This report focuses on the knowledge gaps concerning extended storage identified in numerous domestic and international investigations and provides the Used Fuel Disposition Campaign"s (UFDC) gap description, any alternate gap descriptions, the rankings by the various organizations, evaluation of the priority assignment, and UFDC-recommended action based on the comparison. Review of Used Nuclear Fuel Storage and Transportation Technical Gap Analysis More Documents & Publications

212

Spectral gap and logarithmic Sobolev constant for continuous spin systems  

E-Print Network (OSTI)

The aim of this paper is to study the spectral gap and the logarithmic Sobolev constant for continuous spin systems. A simple but general result for estimating the spectral gap of finite dimensional systems is given by Theorem 1.1, in terms of the spectral gap for one-dimensional marginals. The study of the topic provides us a chance, and it is indeed another aim of the paper, to justify the power of the results obtained previously. The exact order in dimension one (Proposition 1.4), and then the precise leading order and the explicit positive regions of the spectral gap and the logarithmic Sobolev constant for two typical infinite-dimensional models are presented (Theorems 6.2 and 6.3). Since we are interested in explicit estimates, the computations become quite involved. A long section (Section 4) is devoted to the study of the spectral gap in dimension one.

Mu-Fa Chen

2010-04-26T23:59:59.000Z

213

Substrate-Induced Band-Gap Opening in Epitaxial Graphene  

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

Substrate-Induced Band-Gap Opening in Epitaxial Graphene Print Substrate-Induced Band-Gap Opening in Epitaxial Graphene Print Prospective challengers to silicon, the long-reigning king of semiconductors for computer chips and other electronic devices, have to overcome silicon's superb collection of materials properties as well as sophisticated fabrication technologies refined by six decades of effort by materials scientists and engineers. Graphene, one of the latest contenders, has a rather impressive list of features of its own but has lacked a key characteristic of all semiconductors, an energy gap (band gap) in its electronic band structure. A multi-institutional collaboration under the leadership of researchers with Berkeley Lab and the University of California, Berkeley, have now demonstrated that growing an epitaxial film of graphene on a silicon carbide substrate results in a significant band gap, 0.26 electron volts (eV), an important step toward making graphene useful as a semiconductor.

214

Fully scaled 0.5 ?m MOS cicuits by synchroton X-ray lithography: Resist systems and line width control  

Science Journals Connector (OSTI)

To test the line width control of typical resist systems in x-ray lithography, we have developed and utilized x-ray resist processes for all levels in the fabrication of NMOS and CMOS devices with 0.5 ?m ground rules. Results from line width control studies will be discussed along with the process latitude from the resist systems.

D. Seeger; K. Kwietniak; D. Crockatt; A. Wilson; J. Warlaumont

1989-01-01T23:59:59.000Z

215

Industrial Optimization Compact Course  

E-Print Network (OSTI)

Industrial Optimization Compact Course and Challenge Workshop Optimization plays a crucial role of the processes are typically nonlinear and dyna- mic. Thus, complex dynamic optimization or optimal control in industrial optimization. February 17­20, 2014 ·9.00­17.00 IWR ·Im Neuenheimer Feld 368 ·69120 Heidelberg www

Kirches, Christian

216

Optimized regulator for the quantized anharmonic oscillator  

E-Print Network (OSTI)

The energy gap between the first excited state and the ground state is calculated for the quantized anharmonic oscillator in the framework of the functional renormalization group method. The compactly supported smooth regulator is used which includes various types of regulators as limiting cases. It was found that the value of the energy gap depends on the regulator parameters. We argue that the optimization based on the disappearance of the false, broken symmetric phase of the model leads to the Litim's regulator. The least sensitivity on the regulator parameters leads however to an IR regulator being somewhat different of the Litim's one, but it can be described as a perturbatively improved, or generalized Litim's regulator and provides analytic evolution equations, too.

J. Kovacs; S. Nagy; K. Sailer

2014-03-14T23:59:59.000Z

217

The optimization problem Genetic Algorithm  

E-Print Network (OSTI)

The optimization problem Genetic Algorithm Particle Swarm Optimization Experimental results for time-power optimization META, October 27-31, 2014 1 / 25 #12;The optimization problem Genetic Algorithm Particle Swarm Optimization Experimental results Conclusions Time and energy optimization Traditionally

Giménez, Domingo

218

Application of Artificial Neural Network in Control of Vector Pulse-Width Modulation Inverter  

Science Journals Connector (OSTI)

This paper describes neural controller that performs optimal switching strategy of VSI-PWM inverter. The strategy is based on rearranging the order of inverter output vectors in order to reduce the number of switched tranzistors during one time period, ...

Pavel Brandstetter; Martin Skotnica

1999-05-01T23:59:59.000Z

219

Shrinking Procedures and Optimal Algorithms  

E-Print Network (OSTI)

Jun 18, 2012 ... Optimal Stochastic Approximation Algorithms for Strongly Convex Stochastic Composite Optimization, II: Shrinking Procedures and Optimal ...

Saeed Ghadimi

2012-06-18T23:59:59.000Z

220

Bridging the Gaps of High-Tc Superconductor  

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

Bridging the Gaps of High-Tc Bridging the Gaps of High-Tc Superconductor Since the discovery of high-temperature superconductor by Bednorz and Müller in 1986, this field has become one of the most important research topics in solid state physics. In the past 20 years many unconventional properties have been discovered in this new class of materials. These have challenged our conventional wisdom and driven the development of many novel theories. Among these discoveries, the most mysterious is probably the pseudogap phenomena: it has been observed that there is an energy gap above the superconducting transition temperature (TC) that persists over a wide range of temperatures and chemical compositions [1]. This peculiar behavior appears to be very different from a conventional superconductor. Here the electrons form so-called "Cooper pairs", which manifests itself as an energy gap in many spectroscopic measurements. This energy gap, known as superconducting gap, appears only below TC where the electrical resistance also vanishes (hence the name 'superconductor'). This important difference has stimulated lots of debate in the search of understanding high-TC superconductivity on questions such as: "What is the pseudogap?" and "What is its relation to superconducting gap and superconductivity at high temperature?"

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


221

Analysis and optimization of incompressible separated flow around an airfoil with two finite-gap flaps  

E-Print Network (OSTI)

and a 25% Slotted Flap ((2 = 8. 0' 6s = 0. 0 6f = 20 ) 90 91 36 Pressure Distribution, NACA 23012 with a 17% Fixed Slot and a 25% Slotted Flap (o - 8. 0 , 6s = 0. 0 , 6'f - 40 ) 92 37 Drag Coefficient versus Lift Coefficient for a GA(W)-2 with a... distributed vorticity V(s) on B, and 4s is produced by uniformly distributed sources of strength o(s) on B. For two dimensional flow lv and 4s can be written as: ln r(x, z;s')ds' s J02s e = -I'~s' e(x, z;s )as JO 2 s With these definitions, equation (1...

Anderson, Murray Belser

1988-01-01T23:59:59.000Z

222

Optimizing the Q value in three-dimensional metallic photonic band gap crystals  

E-Print Network (OSTI)

, and for improving solar energy collection.12 The complementary inductive metallic patches are also FSS with a low in the transmission are created by removing portions of the metallic rods in a single defect layer. A high quality composed of material with a high dielectric constant in a lower dielec- tric background such as air

Soukoulis, Costas

223

Optimal design of a micro evaporator with lateral gaps Taijong Sung a  

E-Print Network (OSTI)

transfer coefficient (HTC) and it forms the starting point in developing miniaturized vapor­outlet condi- tions of the evaporator have a standard design of expansion valve and compressor and so the heat and Lee [7] studied the correlation in order to represent the heat transfer coefficients of the boiling

Kim, Jongwon

224

Optimization Online - Multistage Adaptive Robust Optimization for ...  

E-Print Network (OSTI)

Sep 5, 2014 ... ... with the increasing penetration of wind and solar power generation has ... Keywords: Electric energy systems, multistage robust optimization, ... Multistage Adaptive Robust Optimization for the Unit Commitment Problem.

Alvaro Lorca

2014-09-05T23:59:59.000Z

225

COMBINATORIAL OPTIMIZATION IN TELECOMMUNICATIONS  

E-Print Network (OSTI)

COMBINATORIAL OPTIMIZATION IN TELECOMMUNICATIONS MAURICIO G. C. RESENDE Abstract. Combinatorial to optimally design a SONET ring network. The last problem comes up when planning a global telecommunications network. 1. Introduction Combinatorial optimization problems are abundant in the telecommunications

Resende, Mauricio G. C.

226

Essays on optimal taxation  

E-Print Network (OSTI)

This thesis studies the optimal income tax scheme in four different settings. Chapter 1 focuses on the implications of lack of commitment for the optimal labor and capital income tax rates. It finds that it is optimal to ...

Reis, Catarina (Catarina Luis Monteiro dos)

2007-01-01T23:59:59.000Z

227

Compiler Optimization Jordan Bradshaw  

E-Print Network (OSTI)

Compiler Optimization Jordan Bradshaw #12;Outline Overview Goals and Considerations ­ Scope. 346- 352. Print. "Compiler Optimization." Wikipedia. Wikimedia Foundation, 25 04 2010. Web. 25 Apr 2010. #12;Compiler Optimization Goals: ­ Speed

Valtorta, Marco

228

Pessimistic Bilevel Optimization  

E-Print Network (OSTI)

We study a variant of the pessimistic bilevel optimization problem, which comprises constraints that must be satisfied for any optimal solution of a subordinate (lower-level) optimization problem. We present conditions ...

Wiesemann, Wolfram

229

Solar off-limb line widths: Alfven waves, ion-cyclotron waves, and preferential heating  

E-Print Network (OSTI)

Alfven waves and ion-cyclotron absorption of high-frequency waves are frequently brought into models devoted to coronal heating and fast solar-wind acceleration. Signatures of ion-cyclotron resonance have already been observed in situ in the solar wind (HELIOS spacecrafts) and, recently, in the upper corona (UVCS/SOHO remote-sensing results). We propose a method to constrain both the Alfven wave amplitude and the preferential heating induced by ion-cyclotron resonance, above a partially developed polar coronal hole observed with the SUMER/SOHO spectrometer. The instrumental stray light contribution is first substracted from the spectra. By supposing that the non-thermal velocity is related to the Alfven wave amplitude, it is constrained through a density diagnostic and the gradient of the width of the Mg X 625 A line. The temperatures of several coronal ions, as functions of the distance above the limb, are then determined by substracting the non-thermal component to the observed line widths. The effect of stray light explains the apparent decrease with height in the width of several spectral lines, this decrease usually starting about 0.1-0.2 Rs above the limb. This result rules out any direct evidence of damping of the Alfven waves, often suggested by other authors. We also find that the ions with the smallest charge-to-mass ratios are the hottest ones at a fixed altitude and that they are subject to a stronger heating, as compared to the others, between 57" and 102" above the limb. This constitutes a serious clue to ion-cyclotron preferential heating.

L. Dolla; J. Solomon

2008-04-18T23:59:59.000Z

230

Optimization Online - Certificates of Optimality and Sensitivity ...  

E-Print Network (OSTI)

Dec 9, 2014 ... Certificates of Optimality and Sensitivity Analysis using Generalized Subadditive Generator Functions: A test study on Knapsack Problems.

Babak Moazzez

2014-12-09T23:59:59.000Z

231

Optimization Online - Semidefinite Optimization Approaches to ...  

E-Print Network (OSTI)

Sep 16, 2014 ... Semidefinite Optimization Approaches to Applications in Facility ... Category 2: Applications -- OR and Management Sciences (Transportation ).

Philipp Hungerlaender

2014-09-16T23:59:59.000Z

232

Software Quality Assurance Improvment Plan: ALOHA Gap Analysis, Final Report  

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

Final-ALOHA Final-ALOHA Defense Nuclear Facilities Safety Board Recommendation 2002-1 Software Quality Assurance Improvement Plan Commitment 4.2.1.3: Software Quality Assurance Improvement Plan: ALOHA Gap Analysis Final Report U.S. Department of Energy Office of Environment, Safety and Health 1000 Independence Ave., S.W. Washington, DC 20585-2040 May 2004 ALOHA Gap Analysis May 2004 Final Report INTENTIONALLY BLANK ii ALOHA Gap Analysis May 2004 Final Report FOREWORD This report documents the outcome of an evaluation of the Software Quality Assurance (SQA) attributes of the chemical source term and atmospheric dispersion computer code, ALOHA 5.2.3, relative to established

233

Different approaches to calculate the $K^{\\pm}\\to ?^{\\pm}?^0e^+e^-$ decay width  

E-Print Network (OSTI)

The rare $K^\\pm\\to\\pi^\\pm\\pi^0 e^+e^-$ decay, currently under analysis by the NA48/2 Collaboration, is considered. We have performed two theoretical approaches to calculate the differential decay width -- in the kaon rest frame, where we use Cabibbo-Maksimovicz variables, and in the center-of-mass system of the lepton pair. The latter essentially simplifies the computations. A comparison between the two approaches has been performed. We have also found the dependencies of the differential decay rate as a function of the virtual photon and dipion system masses

S. R. Gevorkyan; M. H. Misheva

2014-03-05T23:59:59.000Z

234

Top-quark mass predictions from W,Z masses and Z partial widths  

Science Journals Connector (OSTI)

We use recent measurements of the W- and Z-boson masses and the leptonic, hadronic, and total Z widths to constrain the top-quark mass in the standard model, including full radiative corrections. From a maximum-likelihood analysis we find the most likely value of mt to be 151 GeV and we obtain the bound mt?200 GeV at 95% C.L. based on the central measured value of the Z mass assuming a Higgs-boson mass of 100 GeV and ?s(MZ2)=0.12.

V. Barger; J. L. Hewett; T. G. Rizzo

1990-09-10T23:59:59.000Z

235

HIGLU and HDECAY: Programs for Higgs boson production at the LHC and Higgs boson decay widths  

Science Journals Connector (OSTI)

The total cross section for neutral Higgs boson production via the gluon fusion mechanism including NLO (two-loop) QCD corrections can be calculated numerically with the program HIGLU within the Standard Model (SM) as well as its minimal supersymmetric extension (MSSM). The program HDECAY determines the decay widths and branching ratios of the Higgs bosons within the SM and the MSSM, including the dominant higher-order corrections. The program is able to calculate the branching ratios of the MSSM Higgs bosons into standard and supersymmetric particles.

Michael Spira

1997-01-01T23:59:59.000Z

236

Implication on Higgs invisible width in light of the new CDMS result  

E-Print Network (OSTI)

With the assumption that the dominant diagram in supersymmetry for the spin-independent cross section of the dark matter particle is due to Higgs boson exchange, we obtain an upper limit on the Higgs-dark-matter coupling based on the new result of the CDMSII Collaborations. We then obtain an upper limit on the invisible width of the Higgs boson, numerically it is less than 20-120 MeV for $m_h \\simeq 120 - 180$ GeV. Implications for Higgs boson search are also discussed.

Kingman Cheung; Tzu-Chiang Yuan

2009-12-23T23:59:59.000Z

237

Optimization Online - Digest  

E-Print Network (OSTI)

Complete the form below to subscribe to the free Optimization Online Digest. ... Type your e-mail address to unsubscribe from the Optimization Online Digest.

238

PDSF Performance and Optimization  

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

Optimization Performance and Optimization Running Jobs Efficiently This page defines job efficiency and how to measure the efficiency of your jobs. Read More PDSF IO Monitoring...

239

Method and apparatus for pulse width modulation control of an AC induction motor  

DOE Patents (OSTI)

An inverter is connected between a source of DC power and a three-phase AC induction motor, and a micro-processor-based circuit controls the inverter using pulse width modulation techniques. In the disclosed method of pulse width modulation, both edges of each pulse of a carrier pulse train are equally modulated by a time proportional to sin .THETA., where .THETA. is the angular displacement of the pulse center at the motor stator frequency from a fixed reference point on the carrier waveform. The carrier waveform frequency is a multiple of the motor stator frequency. The modulated pulse train is then applied to each of the motor phase inputs with respective phase shifts of 120.degree. at the stator frequency. Switching control commands of electronic switches in the inverter are stored in a random access memory (RAM) and the locations of the RAM are successively read out in a cyclic manner, each bit of a given RAM location controlling a respective phase input of the motor. The DC power source preferably comprises rechargeable batteries and all but one of the electronic switches in the inverter can be disabled, the remaining electronic switch being part of a "flyback" DC-DC converter circuit for recharging the battery.

Geppert, Steven (Bloomfield Hills, MI); Slicker, James M. (Union Lake, MI)

1984-01-01T23:59:59.000Z

240

Combination of CDF and D0 results on the W boson mass and width  

SciTech Connect

The results on the direct measurements of the W-boson mass and width, based on the data collected by the Tevatron experiments CDF and D{sup -} at Fermilab are summarized and combined. The CDF Run-0 (1988-1889) and Run-I (1992-1995) results have been re-averaged using the BLUE method and combined with Run-I D{sup -} results and the latest published results from CDF taken from the first period of Run-II (2001-2004). The results are corrected to have consistency between the parton distribution functions and electroweak parameters. The resulting Tevatron averages for the mass and total decay width of the W boson are: M{sub W} = 80432 {+-} 39 MeV and {Lambda}{sub W} = 2056 {+-} 62 MeV. The inclusion of a preliminary Run-II measurement of {Lambda}{sub W} from D{sup -}0 gives {Lambda}{sub W} = 2050 {+-} 58 MeV.

Group, Tevatron Electroweak Working

2008-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "optimal gap width" 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

Measurement of radiative widths of $a_2(1320)$ and $?_2(1670)$  

E-Print Network (OSTI)

The COMPASS Collaboration at CERN has investigated the reaction $\\pi^- \\gamma \\rightarrow \\pi^-\\pi^-\\pi^+$ embedded in the Primakoff reaction of $190~\\textrm{GeV}$ pions scattering in the Coulomb field of a lead target, $\\pi^- \\text{Pb} \\rightarrow \\pi^-\\pi^-\\pi^+ \\text{Pb}$. Exchange of quasi-real photons is selected by isolating the sharp Coulomb peak observed at momentum transfer below $0.001~(\\text{GeV}/c)^2$. Using a partial-wave analysis the amplitudes and relative phases of the $a_2(1320)$ and $\\pi_2(1670)$ mesons have been extracted, and the Coulomb and the diffractive contributions have been disentangled. Measuring absolute production cross sections we have determined the radiative width of the $a_2(1320)$ to be $\\Gamma_0(a_2(1320) \\rightarrow \\pi\\gamma) = (358 \\pm 6_{\\textrm{stat}} \\pm 42_{\\textrm{syst}})~\\textrm{keV}$. As the first measurement, $\\Gamma_0(\\pi_2(1670) \\rightarrow \\pi\\gamma) = (181 \\pm 11_{\\textrm{stat}} \\pm 27_{\\textrm{syst}})~\\textrm{keV} \\cdot (\\textrm{BR}^{\\textrm{PDG}}_{f_2 \\pi}/\\textrm{BR}_{f_2 \\pi})$ is obtained for the radiative width of the $\\pi_2(1670)$, where in this analysis the branching ratio $\\textrm{BR}^{\\textrm{PDG}}_{f_2 \\pi}=0.56$ has been used. We compare these values to previous measurements and theoretical predictions.

C. Adolph; R. Akhunzyanov; M. G. Alekseev; G. D. Alexeev; A. Amoroso; V. Andrieux; V. Anosov; A. Austregesilo; B. Badelek; F. Balestra; J. Barth; G. Baum; R. Beck; Y. Bedfer; A. Berlin; J. Bernhard; K. Bicker; J. Bieling; R. Birsa; J. Bisplinghoff; M. Bodlak; M. Boer; P. Bordalo; F. Bradamante; C. Braun; A. Bressan; M. Buechele; E. Burtin; L. Capozza; M. Chiosso; S. U. Chung; A. Cicuttin; M. L. Crespo; Q. Curiel; S. Dalla Torre; S. S. Dasgupta; S. Dasgupta; O. Yu. Denisov; S. V. Donskov; N. Doshita; V. Duic; W. Duennweber; M. Dziewiecki; A. Efremov; C. Elia; P. D. Eversheim; W. Eyrich; M. Faessler; A. Ferrero; A. Filin; M. Finger; M. Finger~jr.; H. Fischer; C. Franco; N. du~Fresne~von~Hohenesche; J. M. Friedrich; V. Frolov; F. Gautheron; O. P. Gavrichtchouk; S. Gerassimov; R. Geyer; I. Gnesi; B. Gobbo; S. Goertz; M. Gorzellik; S. Grabmueller; A. Grasso; B. Grube; A. Guskov; T. Guthoerl; F. Haas; D. von Harrach; D. Hahne; R. Hashimoto; F. H. Heinsius; F. Herrmann; F. Hinterberger; Ch. Hoeppner; N. Horikawa; N. d'Hose; S. Huber; S. Ishimoto; A. Ivanov; Yu. Ivanshin; T. Iwata; R. Jahn; V. Jary; P. Jasinski; P. Joerg; R. Joosten; E. Kabuss; B. Ketzer; G. V. Khaustov; Yu. A. Khokhlov; Yu. Kisselev; F. Klein; K. Klimaszewski; J. H. Koivuniemi; V. N. Kolosov; K. Kondo; K. Koenigsmann; I. Konorov; V. F. Konstantinov; A. M. Kotzinian; O. Kouznetsov; Z. Kral; M. Kraemer; Z. V. Kroumchtein; N. Kuchinski; F. Kunne; K. Kurek; R. P. Kurjata; A. A. Lednev; A. Lehmann; S. Levorato; J. Lichtenstadt; A. Maggiora; A. Magnon; N. Makke; G. K. Mallot; C. Marchand; A. Martin; J. Marzec; J. Matousek; H. Matsuda; T. Matsuda; G. Meshcheryakov; W. Meyer; T. Michigami; Yu. V. Mikhailov; Y. Miyachi; A. Nagaytsev; T. Nagel; F. Nerling; S. Neubert; D. Neyret; V. I. Nikolaenko; J. Novy; W. -D. Nowak; A. S. Nunes; I. Orlov; A. G. Olshevsky; M. Ostrick; R. Panknin; D. Panzieri; B. Parsamyan; S. Paul; M. Pesek; S. Platchkov; J. Pochodzalla; V. A. Polyakov; J. Pretz; M. Quaresma; C. Quintans; S. Ramos; G. Reicherz; E. Rocco; A. Rychter; N. S. Rossiyskaya; D. I. Ryabchikov; V. D. Samoylenko; A. Sandacz; S. Sarkar; I. A. Savin; G. Sbrizzai; P. Schiavon; C. Schill; T. Schlueter; A. Schmidt; K. Schmidt; H. Schmieden; K. Schoenning; S. Schopferer; M. Schott; O. Yu. Shevchenko; L. Silva; L. Sinha; S. Sirtl; M. Slunecka; S. Sosio; F. Sozzi; A. Srnka; L. Steiger; M. Stolarski; M. Sulc; R. Sulej; H. Suzuki; A. Szabelski; T. Szameitat; P. Sznajder; S. Takekawa; J. ter~Wolbeek; S. Tessaro; F. Tessarotto; F. Thibaud; S. Uhl; I. Uman; M. Vandenbroucke; M. Virius; J. Vondra; L. Wang; T. Weisrock; M. Wilfert; R. Windmolders; H. Wollny; K. Zaremba; M. Zavertyaev; E. Zemlyanichkina; M. Ziembicki.

2014-03-11T23:59:59.000Z

242

A study of line widths and kinetic parameters of ions in the solar corona  

E-Print Network (OSTI)

Solar extreme-ultraviolet (EUV) lines emitted by highly charged ions have been extensively studied to discuss the issue of coronal heating and solar wind acceleration. Based on observations of the polar corona by the SUMER/SOHO spectrometer, this paper investigates the relation between the line widths and kinetic parameters of ions. It is shown that there exists a strongly linear correlation between two variables $(\\sigma/\\lambda)^2$ and $M^{-1}$, where $\\sigma$, $\\lambda$ and $M$ are the half-width of the observed line profile at $1/\\sqrt{e}$, the wavelength and the ion mass, respectively. The Pearson product-moment correlation coefficients exceed 0.9. This finding tends to suggest that the ions from a given height of polar corona have a common temperature and a common non-thermal velocity in terms of existing equation. The temperature and non-thermal velocity are obtained by linear least-square fit. The temperature is around $2.8$ MK at heights of 57$''$ and 102$''$. The non-thermal velocity is typical 21.6...

Zhao, G Q; Wang, C B

2014-01-01T23:59:59.000Z

243

Reduced neutron widths in the nuclear data ensemble: experiment and theory do not agree  

SciTech Connect

I have analyzed reduced neutron widths ({Gamma}{sub n}{sup 0}) for the subset of 1245 resonances in the nuclear data ensemble (NDE) for which they have been reported. Random matrix theory (RMT) predicts for the Gaussian orthogonal ensemble that these widths should follow a {chi}{sup 2} distribution having one degree of freedom ({nu} = 1) - the Porter Thomas distribution (PTD). Careful analysis of the {Gamma}{sub n}{sup 0} values in the NDE rejects the validity of the PTD with a statistical significance of at least 99.97% ({nu} = 0.801 {+-} 0.052). This striking disagreement with the RMT prediction is most likely due to the inclusion of significant p-wave contamination to the supposedly pure s-wave NDE. When an energy-dependent threshold is used to remove the p-wave contamination, the PTD is still rejected with a statistical significance of at least 98.17% ({nu} = 1.217 {+-} 0.092). Furthermore, examination of the primary references for the NDE reveals that many resonances in most of the individual data sets were selected using methods derived from RMT. Therefore, using the full NDE data set to test RMT predictions seems highly questionable. These results cast very serious doubt on claims that the NDE represents a striking confirmation of RMT.

Koehler, Paul Edward [ORNL

2011-01-01T23:59:59.000Z

244

Solar off-limb line widths: Alfven waves, ion-cyclotron waves, and preferential heating  

E-Print Network (OSTI)

Alfven waves and ion-cyclotron absorption of high-frequency waves are frequently brought into models devoted to coronal heating and fast solar-wind acceleration. Signatures of ion-cyclotron resonance have already been observed in situ in the solar wind (HELIOS spacecrafts) and, recently, in the upper corona (UVCS/SOHO remote-sensing results). We propose a method to constrain both the Alfven wave amplitude and the preferential heating induced by ion-cyclotron resonance, above a partially developed polar coronal hole observed with the SUMER/SOHO spectrometer. The instrumental stray light contribution is first substracted from the spectra. By supposing that the non-thermal velocity is related to the Alfven wave amplitude, it is constrained through a density diagnostic and the gradient of the width of the Mg X 625 A line. The temperatures of several coronal ions, as functions of the distance above the limb, are then determined by substracting the non-thermal component to the observed line widths. The effect of st...

Dolla, L

2008-01-01T23:59:59.000Z

245

Photon data shed new light upon the GDR spreading width in heavy nuclei  

E-Print Network (OSTI)

A global study of the electric dipole strength in and below the isovector giant dipole resonance (GDR) is presented for mass numbers A>80. It relies on the recently established remarkably good match between data for the nuclear photo effect to novel photon scattering data covering the region below the neutron emission threshold as well as by average resonance neutron capture (ARC). From the wide energy coverage of these data the correlation of the GDR spreading width with energy can be studied with remarkable accuracy. A clear sensitivity to details of the nuclear shape, i.e. the beta- and gamma-deformations, is demonstrated. Based hereon a new parameterization of the energy dependence of the nuclear electric-dipole strength is proposed which - with only two new parameters - allows to describe the dipole strength in all heavy nuclei with A>80. Although it differs significantly from previous parameterizations it holds for spherical, transitional, triaxial and well deformed nuclei. The GDR spreading width depends in a regular way on the respective resonance energy, but it is independent of the photon energy.

A. R. Junghans; G. Rusev; R. Schwengner; A. Wagner; E. Grosse

2008-10-13T23:59:59.000Z

246

Closing the Gender Gap in Energy Policy | Department of Energy  

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

the Gender Gap in Energy Policy the Gender Gap in Energy Policy Closing the Gender Gap in Energy Policy April 7, 2011 - 3:07pm Addthis Melanie A. Kenderdine Melanie A. Kenderdine Director of the Office of Energy Policy and Systems Analysis What are the key facts? There's not just a shortage of women in technical energy-related fields, there's also a shortage of women in energy policy. Women hold only 27 percent of the science and engineering jobs in the United States. Editor's Note: Join the conversation surrounding this year's Clean Energy Ministerial on Twitter via #CEM2. There's a well-documented gender gap for women in science and engineering, or women in the "STEM" fields of science, technology, engineering and math. The numbers are stark: According to the National Science Foundation, women hold only 27 percent of the science and

247

Suicide mortality gap between Francophones and Anglophones of Quebec, Canada  

Science Journals Connector (OSTI)

Few studies evaluate language-group differences in suicide mortality. This study assessed the suicide mortality gap between Francophones and Anglophones of Quebec, Canada according to age, sex, method...

Stephanie Burrows; Nathalie Auger…

2013-07-01T23:59:59.000Z

248

Governing the gap: Forging safe science through relational regulation  

E-Print Network (OSTI)

Designed to close the ubiquitous gap between law on the books and law in action, management systems locate the standard setting and implementation of regulation within the regulated organization itself. Despite efforts to ...

Huising, Ruthanne

249

Air-gap sacrificial materials by initiated chemical vapor deposition  

E-Print Network (OSTI)

P(neopentyl methacrylate-co-ethylene glycol dimethacrylate) copolymer, abbreviated as P(npMAco-EGDA), was selected as the potential air-gap sacrificial material among possible combination of twenty monomers and four ...

Lee, Long Hua

2007-01-01T23:59:59.000Z

250

Synthesis of electromagnetic modes in photonic band gap fibers  

E-Print Network (OSTI)

In this paper, we report on the successful synthesis of three individual modes, HE11, TEo0, and TE02 for transmission in photonic band gap fibers at near infrared wavelengths. We measure the propagation losses of the HE11 ...

Hu, Qichao

2007-01-01T23:59:59.000Z

251

SciTech Connect: Enhanced Superconducting Gaps in Trilayer High...  

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

Enhanced Superconducting Gaps in Trilayer High-Temperature Bi (2) Sr (2) Ca (2) Cu (3) O (10+delta) Cuprate Superconductor Citation Details In-Document Search Title: Enhanced...

252

Columbia Gorge Gap Winds: Their Climatological Influence and Synoptic Evolution  

Science Journals Connector (OSTI)

This paper quantifies the impact of the Columbia Gorge on the weather and climate within and downstream of this mesoscale gap and examines the influence of synoptic-scale flow on gorge weather. Easterly winds occur more frequently and are ...

Justin Sharp; Clifford F. Mass

2004-12-01T23:59:59.000Z

253

References on Spectral Gaps, May 2006, Palo Alto, CA  

E-Print Network (OSTI)

gaps for Schödinger operators with symmetric single well potentials and related ... [21] S. G. Bobkov, Isoperimetric and Analytic Inequalities for Log-Concave. Probability .... Mathematical Physics (Birmingham, Alabama, 1986), Lect. Notes in

2006-05-19T23:59:59.000Z

254

Permanent-magnet-less machine having an enclosed air gap  

DOE Patents (OSTI)

A permanent magnet-less, brushless synchronous system includes a stator that generates a magnetic rotating field when sourced by an alternating current. An uncluttered rotor disposed within the magnetic rotating field is spaced apart from the stator to form an air gap relative to an axis of rotation. A stationary excitation core spaced apart from the uncluttered rotor by an axial air gap and a radial air gap substantially encloses the stationary excitation core. Some permanent magnet-less, brushless synchronous systems include stator core gaps to reduce axial flux flow. Some permanent magnet-less, brushless synchronous systems include an uncluttered rotor coupled to outer laminations. The quadrature-axis inductance may be increased in some synchronous systems. Some synchronous systems convert energy such as mechanical energy into electrical energy (e.g., a generator); other synchronous systems may convert any form of energy into mechanical energy (e.g., a motor).

Hsu, John S. (Oak Ridge, TN)

2012-02-07T23:59:59.000Z

255

Proper Sustainability: GAP Grant Proposal Work Plan Strategy Webinar  

Office of Energy Efficiency and Renewable Energy (EERE)

In this webinar I will discuss the new GAP grant requirements for tribal environmental programs and strategies for crafting a work plan that focuses on capacity building activities.  My goal is to...

256

Beneath the surface: The decline in gender injury gap  

Science Journals Connector (OSTI)

Abstract Gender differences in the labor market are typically measured by the wage gap. In this paper, we investigate how extending the analysis to an additional job amenity, namely workplace safety, may shed new light on the evolution of gender differences. Our results show that focusing on one unique measure of the gender gap may provide a biased view of the actual progress of women in the labor market. In our data, a significant reduction in the wage gap has been accompanied by a relative increase in injury risk for some groups of workers, e.g. low-skilled female workers. The decreased gender wage gap for these workers does not necessarily imply an overall improvement in their labor market outcomes.

Tiziano Razzolini; Roberto Leombruni; Giovanni Mastrobuoni; Mario Pagliero

2014-01-01T23:59:59.000Z

257

Closing gaps in the human genome using sequencing by synthesis  

E-Print Network (OSTI)

The most recent release of the finished human genome contains 260 euchromatic gaps (excluding chromosome Y). Recent work has helped explain a large number of these unresolved regions as 'structural' in nature. Another class ...

Arachchi, Harindra M.

258

Influence of pulse width and target density on pulsed laser deposition of thin YBaCuO film.  

SciTech Connect

We have studied the effects of temporal pulse width and target density on the deposition of thin films of YBaCuO. A 248nm excimer laser and an 825nm Ti-sapphire laser were used to conduct the experiments with pulse widths of 27 ns, 16 ns, and 150 fs, and target densities of 80% and 90%. Scanning electron microscope photomicrographs and profilometer traces show a striking difference between nanosecond and femtosecond laser irradiation. Shortening the pulse width reduced particulate formation, provided stoichiometry, and improved the film properties. Decreasing the target density raised the ablation rate, produced thicker but nonuniform films, and reduced particulate formation.

Vikram, S.

1999-01-20T23:59:59.000Z

259

Spectral line width decrease in the solar corona: resonant energy conversion from Alfv{é}n to acoustic waves  

E-Print Network (OSTI)

Observations reveal an increase with height of the line width of several coronal spectral lines probably caused by outwardly propagating Alfv{\\'e}n waves. However, the spectral line width sometimes shows a sudden decrease at a height 0.1-0.2 R, where the ratio of sound to Alfven speeds may approach unity. Qualitative analysis shows that the resonant energy conversion from Alfven to acoustic waves near the region of the corona where the plasma $\\beta$ approaches unity may explain the observed spectral line width reduction.

T. V. Zaqarashvili; R. Oliver; J. L. Ballester

2007-03-13T23:59:59.000Z

260

Hydrogeologic Model for the Gable Gap Area, Hanford Site  

SciTech Connect

Gable Gap is a structural and topographic depression between Gable Mountain and Gable Butte within the central Hanford Site. It has a long and complex geologic history, which includes tectonic uplift synchronous with erosional downcutting associated with the ancestral Columbia River during both Ringold and Cold Creek periods, and by the later Ice Age (mostly glacial Lake Missoula) floods. The gap was subsequently buried and partially backfilled by mostly coarse-grained, Ice Age flood deposits (Hanford formation). Erosional remnants of both the Ringold Formation and Cold Creek unit locally underlie the high-energy flood deposits. A large window exists in the gap where confined basalt aquifers are in contact with the unconfined suprabasalt aquifer. Several paleochannels, of both Hanford and Ringold Formation age, were eroded into the basalt bedrock across Gable Gap. Groundwater from the Central Plateau presently moves through Gable Gap via one or more of these shallow paleochannels. As groundwater levels continue to decline in the region, groundwater flow may eventually be cut off through Gable Gap.

Bjornstad, Bruce N.; Thorne, Paul D.; Williams, Bruce A.; Last, George V.; Thomas, Gregory S.; Thompson, Michael D.; Ludwig, Jami L.; Lanigan, David C.

2010-09-30T23:59:59.000Z

Note: This page contains sample records for the topic "optimal gap width" 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

The role of parallel heat transport in the relation between upstream scrape-off layer widths and target heat flux width in H-mode plasmas of NSTX.  

SciTech Connect

The physics of parallel heat transport was tested in the Scrape-off Layer (SOL) plasma of the National Spherical Torus Experiment (NSTX) [M. Ono, et al., Nucl. Fusion 40, 557 (2000) and S. M. Kaye, et al., Nucl. Fusion 45, S168 (2005)] tokamak by comparing the upstream electron temperature (T{sub e}) and density (n{sub e}) profiles measured by the mid-plane reciprocating probe to the heat flux (q{sub {perpendicular}}) profile at the divertor plate measured by an infrared (IR) camera. It is found that electron conduction explains the near SOL width data reasonably well while the far SOL, which is in the sheath limited regime, requires an ion heat flux profile broader than the electron one to be consistent with the experimental data. The measured plasma parameters indicate that the SOL energy transport should be in the conduction-limited regime for R-R{sub sep} (radial distance from the separatrix location) < 2-3 cm. The SOL energy transport should transition to the sheath-limited regime for R-R{sub sep} > 2-3cm. The T{sub e}, n{sub e}, and q{sub {perpendicular}} profiles are better described by an offset exponential function instead of a simple exponential. The conventional relation between mid plane electron temperature decay length ({lambda}{sub Te}) and target heat flux decay length ({lambda}{sub q}) is {lambda}{sub Te} = 7/2{lambda}{sub q}, whereas the newly-derived relation, assuming offset exponential functional forms, implies {lambda}{sub Te} = (2-2.5){lambda}{sub q}. The measured values of {lambda}{sub Te}/{lambda}{sub q} differ from the new prediction by 25-30%. The measured {lambda}{sub q} values in the far SOL (R-R{sub sep} > 2-3cm) are 9-10cm, while the expected values are 2.7 < {lambda}{sub q} < 4.9 cm (for sheath-limited regime). We propose that the ion heat flux profile is substantially broader than the electron heat flux profile as an explanation for this discrepancy in the far SOL.

Ahn, J W; Boedo, J A; Maingi, R; Soukhanovskii, V A

2009-01-05T23:59:59.000Z

262

Investigating the book-tax income gap : factors which affect the gap and details regarding its most significant component  

E-Print Network (OSTI)

(cont.) In total, my thesis suggests that recent changes in the book-tax income gap may be exogenous and transitory, due to changes to the calculation of book income, general business conditions or other factors which ...

Seidman, Jeri

2008-01-01T23:59:59.000Z

263

Optimization Gordon K. Smyth  

E-Print Network (OSTI)

Optimization Gordon K. Smyth Volume 3, pp 1481­1487 in Encyclopedia of Environmetrics (ISBN 0471 #12;Optimization Optimization is the process by which one finds that value of a vector x, say, that maximizes or minimizes a given function f x . The idea of optimization goes to the heart of statistical

Smyth, Gordon K.

264

Wide-band-gap solar cells with high stabilized performance. Annual subcontract report, July 15, 1994--July 14, 1995  

SciTech Connect

This report describes work performed by Pennsylvania State University in collaboration with the NREL Wide-Band-Gap Team. The goal of this team is to develop a single-junction, wide-gap solar cell with good stabilized parameters. The objectives of the subcontract are to (1) develop a cost-effective amorphous silicon PV technology to foster a viable amorphous silicon PV industry in the US, ensuring that this industry remains a world leader in the a-Si technology; (2) help the US a-Si PV industry achieve the US DOE PV Program FY 1995 milestone of 10% stable efficiency commercial thin-film modules; (3) help the US a-Si PV industry achieve 12% stable efficiency multi-junction a-Si:H modules for large-scale utility use by the year 2005. Issues covered in this report include (1) improved understanding of stability in materials and solar cells, (2) intrinsic materials optimization, (3) solar cells optimized for intrinsic layer performance, (4) p-type layer optimization, (5) top cell interfaces, and (6) solar cell grading.

Wronski, C.R.; Collins, R.W.; Fonash, S.J. [Pennsylvania State Univ., University Park, PA (United States)

1995-11-01T23:59:59.000Z

265

Frostbite Theater - Experiments You Can Try at Home! - Measure the Width of  

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

Measure the Speed of Light - With Chocolate! Measure the Speed of Light - With Chocolate! Previous Video (Measure the Speed of Light - With Chocolate!) Frostbite Theater Main Index Next Video (Light is a Particle!) Light is a Particle! Measure the Width of a Hair - With a Laser! Exactly how small is a hair's breadth? Measure it for yourself with nothing more than a laser pointer and a tape measure! [ Show Transcript ] Announcer: Frostbite Theater presents... Cold Cuts! No baloney! Joanna and Steve: Just science! Joanna: Hi! I'm Joanna! Steve: And I'm Steve! Joanna: If you have a laser pointer, and you know how to use it safely, try this. Take a hair, perhaps from a coworker, and tape it in a cardboard frame. Place it a few meters away from the wall and shine the laser through it, making sure that the laser hits the hair.

266

Transmission phase of a quantum dot and statistical fluctuations of partial-width amplitudes  

E-Print Network (OSTI)

Experimentally, the phase of the amplitude for electron transmission through a quantum dot (transmission phase) shows the same pattern between consecutive resonances. Such universal behavior, found for long sequences of resonances, is caused by correlations of the signs of the partial-width amplitudes of the resonances. We investigate the stability of these correlations in terms of a statistical model. For a classically chaotic dot, the resonance eigenfunctions are assumed to be Gaussian distributed. Under this hypothesis, statistical fluctuations are found to reduce the tendency towards universal phase evolution. Long sequences of resonances with universal behavior only persist in the semiclassical limit of very large electron numbers in the dot and for specific energy intervals. Numerical calculations qualitatively agree with the statistical model but quantitatively are closer to universality.

Rodolfo A. Jalabert; Guillaume Weick; Hans A. Weidenmüller; Dietmar Weinmann

2013-12-03T23:59:59.000Z

267

Periodically specified problems: An exponential complexity gap between exact and approximate solutions  

SciTech Connect

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

268

X-ray emission from z pinches at 107 A: Current scaling, gap closure, and shot-to-shot fluctuations  

Science Journals Connector (OSTI)

We have measured the x-ray power and energy radiated by a tungsten-wire-array z pinch as a function of the peak pinch current and the width of the anode-cathode gap at the base of the pinch. The measurements were performed at 13- and 19-MA currents and 1-, 2-, 3-, and 4-mm gaps. The wire material, number of wires, wire-array diameter, wire-array length, wire-array-electrode design, normalized-pinch-current time history, implosion time, and diagnostic package were held constant for the experiments. To keep the implosion time constant, the mass of the array was increased as I2 (i.e., the diameter of each wire was increased as I), where I is the peak pinch current. At 19 MA, the mass of the 300-wire 20-mm-diam 10-mm-length array was 5.9 mg. For the configuration studied, we find that to eliminate the effects of gap closure on the radiated energy, the width of the gap must be increased approximately as I. For shots unaffected by gap closure, we find that the peak radiated x-ray power Pr?I1.24±0.18, the total radiated x-ray energy Er?I1.73±0.18, the x-ray-power rise time ?r?I0.39±0.34, and the x-ray-power pulse width ?w?I0.45±0.17. Calculations performed with a time-dependent model of an optically thick pinch at stagnation demonstrate that the internal energy and radiative opacity of the pinch are not responsible for the observed subquadratic power scaling. Heuristic wire-ablation arguments suggest that quadratic power scaling will be achieved if the implosion time ?i is scaled as I-1/3. The measured 1? shot-to-shot fluctuations in Pr, Er, ?r, ?w, and ?i are approximately 12%, 9%, 26%, 9%, and 2%, respectively, assuming that the fluctuations are independent of I. These variations are for one-half of the pinch. If the half observed radiates in a manner that is statistically independent of the other half, the variations are a factor of 21/2 less for the entire pinch. We calculate the effect that shot-to-shot fluctuations of a single pinch would have on the shot-success probability of the double-pinch inertial-confinement-fusion driver proposed by Hammer et al. [Phys. Plasmas 6, 2129 (1999)]. We find that on a given shot, the probability that two independent pinches would radiate the same peak power to within a factor of 1±? (where 0thermonuclear-fusion experiments, ? must be ~90%. The observed (12/21/2)%=8.5% fluctuation in Pr would provide adequate symmetry on 44% of the shots. We propose that three-dimensional radiative-magnetohydrodynamic simulations be performed to quantify the sensitivity of the x-ray emission to various initial conditions, and to determine whether an imploding z pinch is a spatiotemporal chaotic system.

W. A. Stygar et al.

2004-04-14T23:59:59.000Z

269

Optimization Online - Gradient Sliding for Composite Optimization  

E-Print Network (OSTI)

Abstract: We consider in this paper a class of composite optimization problems whose objective function is given by the summation of a general smooth and ...

Guanghui Lan

270

Optimization Online - Multilevel Optimization Modeling for Risk ...  

E-Print Network (OSTI)

Abstract: Coherent risk measures have become a popular tool for incorporating risk aversion into stochastic optimization models. For dynamic models in which ...

Jonathan Eckstein

271

Optimization Online - Python Optimization Modeling Objects (Pyomo)  

E-Print Network (OSTI)

Dec 30, 2009 ... Abstract: We describe Pyomo, an open source tool for modeling optimization applications in Python. Pyomo can be used to de fine symbolic ...

William Hart

2009-12-30T23:59:59.000Z

272

Optimization Online - Solving Basis Pursuit: Heuristic Optimality ...  

E-Print Network (OSTI)

Jul 15, 2011 ... We propose a heuristic optimality check as a general tool for l^1-minimization, which often allows for early termination by “guessing” a ...

Dirk A. Lorenz

2011-07-15T23:59:59.000Z

273

Optimization Online - Robust Growth-Optimal Portfolios  

E-Print Network (OSTI)

May 24, 2014 ... Abstract: The growth-optimal portfolio is designed to have maximum ... the asset return distribution, which is not directly observable but must be ...

Napat Rujeerapaiboon

2014-05-24T23:59:59.000Z

274

GLOBAL OPTIMIZATION BY CONTINUOUS GRASP Optimization ...  

E-Print Network (OSTI)

Mar 8, 2006 ... Journal of Computational Physics, 99(1):28–. 32, 1992. ... Handbook of Test Problems in Local and ... Handbook of Applied Optimization.

2006-03-08T23:59:59.000Z

275

Optimization Online - Distributionally Robust Convex Optimization  

E-Print Network (OSTI)

Feb 4, 2013 ... Abstract: Distributionally robust optimization is a paradigm for decision-making under uncertainty where the uncertain problem data is governed ...

Wolfram Wiesemann

2013-02-04T23:59:59.000Z

276

Optimization Online - Convex and Nonsmooth Optimization ...  

E-Print Network (OSTI)

D. Drusvyatskiy, A.D. Ioffe, A.S. Lewis. February 2014. Nonsmooth Optimization Variational Analysis of Circular Cone Programs Jinchuan Zhou, Jein-Shan Chen

277

Optimization Online - Topology optimization of a mechanical ...  

E-Print Network (OSTI)

Aug 26, 2005 ... Topology optimization of a mechanical component subject to dynamical constraints. Sonia Calvel (sonia.calvel ***at*** voila.fr)

Sonia Calvel

2005-08-26T23:59:59.000Z

278

Optimization of the Ballistic Guide Design for the SNS FNPB 8.9 A Neutron Line  

E-Print Network (OSTI)

The optimization of the ballistic guide design for the SNS Fundamental Neutron Physics Beamline 8.9 A line is described. With a careful tuning of the shape of the curve for the tapered section and the width of the straight section, this optimization resulted in more than 75% increase in the neutron flux exiting the 33 m long guide over a straight m=3.5 guide with the same length.

Takeyasu M. Ito; Christopher B. Crawford; Geoffrey L. Greene

2006-04-28T23:59:59.000Z

279

Gap formation and stability in non-isothermal protoplanetary discs  

E-Print Network (OSTI)

Several observations of transition discs show lopsided dust-distributions. A potential explanation is the formation of a large-scale vortex acting as a dust-trap at the edge of a gap opened by a giant planet. Numerical models of gap-edge vortices have thus far employed locally isothermal discs, but the theory of this vortex-forming or `Rossby wave' instability was originally developed for adiabatic discs. We generalise the study of planetary gap stability to non-isothermal discs using customised numerical simulations of disc-planet systems where the planet opens an unstable gap. We include in the energy equation a simple cooling function with cooling timescale $t_c=\\beta\\Omega_k^{-1}$, where $\\Omega_k$ is the Keplerian frequency, and examine the effect of $\\beta$ on the stability of gap edges and vortex lifetimes. We find increasing $\\beta$ lowers the growth rate of non-axisymmetric perturbations, and the dominant azimuthal wavenumber $m$ decreases. We find a quasi-steady state consisting of one large-scale, ...

Les, Robert

2015-01-01T23:59:59.000Z

280

Lower bounds to the spectral gap of Davies generators  

SciTech Connect

We construct lower bounds to the spectral gap of a family of Lindblad generators known as Davies maps. These maps describe the thermalization of quantum systems weakly coupled to a heat bath. The steady state of these systems is given by the Gibbs distribution with respect to the system Hamiltonian. The bounds can be evaluated explicitly, when the eigenbasis and the spectrum of the Hamiltonian is known. A crucial assumption is that the spectrum of the Hamiltonian is non-degenerate. Furthermore, we provide a counterexample to the conjecture, that the convergence rate is always determined by the gap of the associated Pauli master equation. We conclude that the full dynamics of the Lindblad generator has to be considered. Finally, we present several physical example systems for which the bound to the spectral gap is evaluated.

Temme, Kristan [Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)] [Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)

2013-12-15T23:59:59.000Z

Note: This page contains sample records for the topic "optimal gap width" 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

Vortex and gap generation in gauge models of graphene  

E-Print Network (OSTI)

Effective quantum field theoretical continuum models for graphene are investigated. The models include a complex scalar field and a vector gauge field. Different gauge theories are considered and their gap patterns for the scalar, vector, and fermion excitations are investigated. Different gauge groups lead to different relations between the gaps, which can be used to experimentally distinguish the gauge theories. In this class of models the fermionic gap is a dynamic quantity. The finite-energy vortex solutions of the gauge models have the flux of the "magnetic field" quantized, making the Bohm-Aharonov effect active even when external electromagnetic fields are absent. The flux comes proportional to the scalar field angular momentum quantum number. The zero modes of the Dirac equation show that the gauge models considered here are compatible with fractionalization.

O. Oliveira; C. E. Cordeiro; A. Delfino; W. de Paula; T. Frederico

2010-12-21T23:59:59.000Z

282

Origin of the charge gap in LaMnPO  

Science Journals Connector (OSTI)

We present high temperature inelastic neutron scattering and magnetic susceptibility measurements of the antiferromagnetic insulator LaMnPO that are consistent with the presence of two-dimensional magnetic correlations up to a temperature Tmax?700K?TN=375 K, the Néel temperature. Optical transmission measurements show the T=300 K direct charge gap ?=1 eV has decreased only marginally by 500 K and suggest it decreases by only 10% at Tmax. Density functional theory and dynamical mean-field theory calculations reproduce a direct charge gap in paramagnetic LaMnPO only when a strong Hund's coupling JH=0.9 eV is included, as well as on-site Hubbard U=8 eV. Our results show that LaMnPO is a Mott-Hund's insulator, in which the charge gap is rather insensitive to antiferromagnetic exchange coupling.

D. E. McNally; J. W. Simonson; K. W. Post; Z. P. Yin; M. Pezzoli; G. J. Smith; V. Leyva; C. Marques; L. DeBeer-Schmitt; A. I. Kolesnikov; Y. Zhao; J. W. Lynn; D. N. Basov; G. Kotliar; M. C. Aronson

2014-11-18T23:59:59.000Z

283

WORKSHOP REPORT:Light-Duty Vehicles Technical Requirements and Gaps for Lightweight and Propulsion Materials  

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

WORKSHOP REPORT:Light-Duty Vehicles Technical Requirements and Gaps for Lightweight and Propulsion Materials

284

Global Optimization of Chemical Reactors and Kinetic Optimization  

E-Print Network (OSTI)

Model; 3-D; Monolith; Reactor; Optimization Introduction TheAngeles Global Optimization of Chemical Reactors and KineticGlobal Optimization of Chemical Reactors and Kinetic

ALHUSSEINI, ZAYNA ISHAQ

2013-01-01T23:59:59.000Z

285

E85 Optimized Engine through Boosting, Spray Optimized DIG, VCR...  

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

More Documents & Publications E85 Optimized Engine through Boosting, Spray Optimized GDi, VCR and Variable Valvetrain E85 Optimized Engine Enhanced Ethanol Engine And Vehicle...

286

Sub-10-nanometre metallic gaps for use in molecular electronics  

E-Print Network (OSTI)

gaps as small as sub-10 nm. Image from (8). Gaps can also be created by trapping gold nanoparticles between large-separation electrodes using an AC field, and then breaking the bridge by applying a large DC 5 1.2 Review of Related Work voltage (16... .3 Simmons Tunnelling Model grown QDs because their local environment is more stable. This susceptibility to electric fields will be apparent in our measurements, as discussed in 7.6. No matter the nature of the excitation, QDs may emit photons when...

Curtis, Kellye Suzanne

2012-07-03T23:59:59.000Z

287

The role of the energy gap in protein folding dynamics  

E-Print Network (OSTI)

The dynamics of folding of proteins is studied by means of a phenomenological master equation. The energy distribution is taken as a truncated exponential for the misfolded states plus a native state sitting below the continuum. The influence of the gap on the folding dynamics is studied, for various models of the transition probabilities between the different states of the protein. We show that for certain models, the relaxation to the native state is accelerated by increasing the gap, whereas for others it is slowed down .

Estelle Pitard; Henri Orland

1998-11-17T23:59:59.000Z

288

An investigation on reliable passivation of GaP  

E-Print Network (OSTI)

reports the results of a study of sputtered Silicon Nitride 3N4) and Anodic Oxide as passivating techniques for Gallium Phosphide. Anodic Oxide was grown on GaP by anodizing the semiconductor in 30% hydrogen peroxide. The resulting oxide had an index... reports the results of a study of sputtered Silicon Nitride 3N4) and Anodic Oxide as passivating techniques for Gallium Phosphide. Anodic Oxide was grown on GaP by anodizing the semiconductor in 30% hydrogen peroxide. The resulting oxide had an index...

Greaves King, Carlos A.

2012-06-07T23:59:59.000Z

289

Nonconvex robust optimization  

E-Print Network (OSTI)

We propose a novel robust optimization technique, which is applicable to nonconvex and simulation-based problems. Robust optimization finds decisions with the best worst-case performance under uncertainty. If constraints ...

Teo, Kwong Meng

2007-01-01T23:59:59.000Z

290

START-GAP3/DLC3 is a GAP for RhoA and Cdc42 and is localized in focal adhesions regulating cell morphology  

SciTech Connect

In the human genome there are three genes encoding RhoGAPs that contain the START (steroidogenic acute regulatory protein (StAR)-related lipid transfer)-domain. START-GAP3/DLC3 is a tumor suppressor gene similar to two other human START-GAPs known as DLC1 or DLC2. Although expression of START-GAP3/DLC3 inhibits the proliferation of cancer cells, its molecular function is not well understood. In this study we carried out biochemical characterization of START-GAP3/DLC3, and explored the effects of its expression on cell morphology and intracellular localization. We found that START-GAP3/DLC3 serves as a stimulator of PLC{delta}1 and as a GAP for both RhoA and Cdc42 in vitro. Moreover, we found that the GAP activity is responsible for morphological changes. The intracellular localization of endogenous START-GAP3/DLC3 was explored by immunocytochemistry and was revealed in focal adhesions. These results indicate that START-GAP3/DLC3 has characteristics similar to other START-GAPs and the START-GAP family seems to share common characteristics.

Kawai, Katsuhisa; Kiyota, Minoru; Seike, Junichi; Deki, Yuko [Graduate School of Life Science, University of Hyogo, Harima Science Garden City, Hyogo-ken 678-1297 (Japan); Yagisawa, Hitoshi [Graduate School of Life Science, University of Hyogo, Harima Science Garden City, Hyogo-ken 678-1297 (Japan)], E-mail: yagisawa@sci.u-hyogo.ac.jp

2007-12-28T23:59:59.000Z

291

Determination of the sign of the decay width difference in the B_s system  

E-Print Network (OSTI)

The interference between the K+K- S-wave and P-wave amplitudes in B_s -> J/psi K+K- decays with the K+K- pairs in the region around the phi(1020) resonance is used to determine the variation of the difference of the strong phase between these amplitudes as a function of K+K- invariant mass. Combined with the results from our CP asymmetry measurements in B_s -> J/psi phi decays, we conclude that the B_s mass eigenstate that is almost CP =+1 is lighter and decays faster than the mass eigenstate that is almost CP =-1. This determines the sign of the decay width difference DeltaGamma_s == Gamma_L -Gamma_H to be positive. Our result also resolves the ambiguity in the past measurements of the CP violating phase phi_s to be close to zero rather than pi. These conclusions are in agreement with the Standard Model expectations.

LHCb Collaboration; R. Aaij; C. Abellan Beteta; B. Adeva; M. Adinolfi; C. Adrover; A. Affolder; Z. Ajaltouni; J. Albrecht; F. Alessio; M. Alexander; G. Alkhazov; P. Alvarez Cartelle; A. A. Alves Jr; S. Amato; Y. Amhis; J. Anderson; R. B. Appleby; O. Aquines Gutierrez; F. Archilli; L. Arrabito; A. Artamonov; M. Artuso; E. Aslanides; G. Auriemma; S. Bachmann; J. J. Back; D. S. Bailey; V. Balagura; W. Baldini; R. J. Barlow; C. Barschel; S. Barsuk; W. Barter; A. Bates; C. Bauer; Th. Bauer; A. Bay; I. Bediaga; S. Belogurov; K. Belous; I. Belyaev; E. Ben-Haim; M. Benayoun; G. Bencivenni; S. Benson; J. Benton; R. Bernet; M. -O. Bettler; M. van Beuzekom; A. Bien; S. Bifani; T. Bird; A. Bizzeti; P. M. Bjørnstad; T. Blake; F. Blanc; C. Blanks; J. Blouw; S. Blusk; A. Bobrov; V. Bocci; A. Bondar; N. Bondar; W. Bonivento; S. Borghi; A. Borgia; T. J. V. Bowcock; C. Bozzi; T. Brambach; J. van den Brand; J. Bressieux; D. Brett; M. Britsch; T. Britton; N. H. Brook; H. Brown; K. de Bruyn; A. Büchler-Germann; I. Burducea; A. Bursche; J. Buytaert; S. Cadeddu; O. Callot; M. Calvi; M. Calvo Gomez; A. Camboni; P. Campana; A. Carbone; G. Carboni; R. Cardinale; A. Cardini; L. Carson; K. Carvalho Akiba; G. Casse; M. Cattaneo; Ch. Cauet; M. Charles; Ph. Charpentier; N. Chiapolini; K. Ciba; X. Cid Vidal; G. Ciezarek; P. E. L. Clarke; M. Clemencic; H. V. Cliff; J. Closier; C. Coca; V. Coco; J. Cogan; P. Collins; A. Comerma-Montells; F. Constantin; A. Contu; A. Cook; M. Coombes; G. Corti; B. Couturier; G. A. Cowan; R. Currie; C. D'Ambrosio; P. David; P. N. Y. David; I. De Bonis; S. De Capua; M. De Cian; F. De Lorenzi; J. M. De Miranda; L. De Paula; P. De Simone; D. Decamp; M. Deckenhoff; H. Degaudenzi; L. Del Buono; C. Deplano; D. Derkach; O. Deschamps; F. Dettori; J. Dickens; H. Dijkstra; P. Diniz Batista; F. Domingo Bonal; S. Donleavy; F. Dordei; A. Dosil Suárez; D. Dossett; A. Dovbnya; F. Dupertuis; R. Dzhelyadin; A. Dziurda; S. Easo; U. Egede; V. Egorychev; S. Eidelman; D. van Eijk; F. Eisele; S. Eisenhardt; R. Ekelhof; L. Eklund; Ch. Elsasser; D. Elsby; D. Esperante Pereira; A. Falabella; E. Fanchini; C. Färber; G. Fardell; C. Farinelli; S. Farry; V. Fave; V. Fernandez Albor; M. Ferro-Luzzi; S. Filippov; C. Fitzpatrick; M. Fontana; F. Fontanelli; R. Forty; O. Francisco; M. Frank; C. Frei; M. Frosini; S. Furcas; A. Gallas Torreira; D. Galli; M. Gandelman; P. Gandini; Y. Gao; J-C. Garnier; J. Garofoli; J. Garra Tico; L. Garrido; D. Gascon; C. Gaspar; R. Gauld; N. Gauvin; M. Gersabeck; T. Gershon; Ph. Ghez; V. Gibson; V. V. Gligorov; C. Göbel; D. Golubkov; A. Golutvin; A. Gomes; H. Gordon; M. Grabalosa Gándara; R. Graciani Diaz; L. A. Granado Cardoso; E. Graugés; G. Graziani; A. Grecu; E. Greening; S. Gregson; B. Gui; E. Gushchin; Yu. Guz; T. Gys; C. Hadjivasiliou; G. Haefeli; C. Haen; S. C. Haines; T. Hampson; S. Hansmann-Menzemer; R. Harji; N. Harnew; J. Harrison; P. F. Harrison; T. Hartmann; J. He; V. Heijne; K. Hennessy; P. Henrard; J. A. Hernando Morata; E. van Herwijnen; E. Hicks; K. Holubyev; P. Hopchev; W. Hulsbergen; P. Hunt; T. Huse; R. S. Huston; D. Hutchcroft; D. Hynds; V. Iakovenko; P. Ilten; J. Imong; R. Jacobsson; A. Jaeger; M. Jahjah Hussein; E. Jans; F. Jansen; P. Jaton; B. Jean-Marie; F. Jing; M. John; D. Johnson; C. R. Jones; B. Jost; M. Kaballo; S. Kandybei; M. Karacson; T. M. Karbach; J. Keaveney; I. R. Kenyon; U. Kerzel; T. Ketel; A. Keune; B. Khanji; Y. M. Kim; M. Knecht; R. F. Koopman; P. Koppenburg; M. Korolev; A. Kozlinskiy; L. Kravchuk; K. Kreplin; M. Kreps; G. Krocker; P. Krokovny; F. Kruse; K. Kruzelecki; M. Kucharczyk; T. Kvaratskheliya; V. N. La Thi; D. Lacarrere; G. Lafferty; A. Lai; D. Lambert; R. W. Lambert; E. Lanciotti; G. Lanfranchi; C. Langenbruch; T. Latham; C. Lazzeroni; R. Le Gac; J. van Leerdam; J. -P. Lees; R. Lefèvre; A. Leflat; J. Lefrançois; O. Leroy; T. Lesiak; L. Li; L. Li Gioi; M. Lieng; M. Liles; R. Lindner; C. Linn; B. Liu; G. Liu; J. von Loeben; J. H. Lopes; E. Lopez Asamar; N. Lopez-March; H. Lu; J. Luisier; A. Mac Raighne; F. Machefert; I. V. Machikhiliyan; F. Maciuc; O. Maev; J. Magnin; S. Malde; R. M. D. Mamunur; G. Manca; G. Mancinelli; N. Mangiafave; U. Marconi; R. Märki; J. Marks; G. Martellotti; A. Martens; L. Martin; A. Martín Sánchez; D. Martinez Santos; A. Massafferri; Z. Mathe; C. Matteuzzi; M. Matveev; E. Maurice; B. Maynard; A. Mazurov; G. McGregor; R. McNulty; M. Meissner; M. Merk; J. Merkel; R. Messi; S. Miglioranzi; D. A. Milanes; M. -N. Minard; J. Molina Rodriguez; S. Monteil; D. Moran; P. Morawski; R. Mountain; I. Mous; F. Muheim; K. Müller; R. Muresan; B. Muryn; B. Muster; M. Musy; J. Mylroie-Smith; P. Naik; T. Nakada; R. Nandakumar; I. Nasteva; M. Nedos; M. Needham; N. Neufeld; A. D. Nguyen; C. Nguyen-Mau; M. Nicol; V. Niess; N. Nikitin; A. Nomerotski; A. Novoselov; A. Oblakowska-Mucha; V. Obraztsov

2012-07-19T23:59:59.000Z

292

Interaction between corrosion crack width and steel loss in RC beams corroded under load  

SciTech Connect

This paper presents results and discussions on an experimental study conducted to relate the rate of widening of corrosion cracks with the pattern of corrosion cracks as well as the level of steel corrosion for RC beams (153 x 254 x 3000 mm) that were corroded whilst subjected to varying levels of sustained loads. Steel corrosion was limited to the tensile reinforcement and to a length of 700 mm at the centre of the beams. The rate of widening of corrosion cracks as well as strains on uncracked faces of RC beams was constantly monitored during the corrosion process, along the corrosion region and along other potential cracking faces of beams using a demec gauge. The distribution of the gravimetric mass loss of steel along the corrosion region was measured at the end of the corrosion process. The results obtained showed that: the rate of widening of each corrosion crack is dependent on the overall pattern of the cracks whilst the rate of corrosion is independent of the pattern of corrosion cracks. A mass loss of steel of 1% was found to induce a corrosion crack width of about 0.04 mm.

Malumbela, Goitseone, E-mail: malumbela@mopipi.ub.b [Dpt. of Civil Eng., Univ. of Cape Town, Private Bag X3, Rondebosch, 7700 (South Africa); Alexander, Mark; Moyo, Pilate [Dpt. of Civil Eng., Univ. of Cape Town, Private Bag X3, Rondebosch, 7700 (South Africa)

2010-09-15T23:59:59.000Z

293

Interference effects of neutral MSSM Higgs bosons with a generalised narrow-width approximation  

E-Print Network (OSTI)

Mixing effects in the MSSM Higgs sector can give rise to a sizeable interference between the neutral Higgs bosons. On the other hand, factorising a more complicated process into production and decay parts by means of the narrow-width approximation (NWA) simplifies the calculation. The standard NWA, however, does not account for interference terms. Therefore, we introduce a generalisation of the NWA (gNWA) which allows for a consistent treatment of interference effects between nearly mass-degenerate particles. Furthermore, we apply the gNWA at the tree and 1-loop level to an example process where the neutral Higgs bosons $h$ and $H$ are produced in the decay of a heavy neutralino and subsequently decay into a fermion pair. The $h-H$ propagator mixing is found to agree well with the approximation of Breit-Wigner propagators times finite wave-function normalisation factors, both leading to a significant interference contribution. The factorisation of the interference term based on on-shell matrix elements reproduces the full interference result within a precision of better than 1% for the considered process. The gNWA also enables the inclusion of contributions beyond the 1-loop order into the most precise prediction.

Elina Fuchs

2014-11-19T23:59:59.000Z

294

REDSHIFTS, WIDTHS, AND RADIANCES OF SPECTRAL LINES EMITTED BY THE SOLAR TRANSITION REGION  

SciTech Connect

A long-standing problem in understanding the physics of the transition region has been the ubiquitous redshifts of transition region ultraviolet spectral lines relative to chromospheric emission lines, a result known since the Skylab era. Extended spectral scans performed for various regions of the solar disk by the Solar Ultraviolet Measurements of Emitted Radiation spectrometer on the Solar and Heliospheric Observatory contain thousands of line profiles per study and allow a thorough investigation of the redshift phenomenon. In using these data from seven distinct disk areas made in lines spanning the chromosphere to coronal temperature range, we derive a relationship between Doppler wavelength shifts and radiances and a relationship between line widths and radiances. While chromospheric and coronal lines emitted by very bright plasmas may in some cases show pronounced redshifts, transition-region lines predominantly show redshifts everywhere in the quiet Sun and in active regions. In coronal holes, however, they display a reduced shift, which at times altogether disappears. The observations and the findings will be described, and possible explanations will be considered.

Feldman, U. [Artep Inc. 2922 Excelsior Spring Circle, Ellicott City, Columbia, MD 21042 (United States); Dammasch, I. E. [Solar Influences Data Analysis Center, Royal Observatory of Belgium, Circular Avenue 3, 1180 Uccle, Brussels (Belgium); Doschek, G. A. [Space Science Division, Naval Research Laboratory, Washington, DC (United States)

2011-12-20T23:59:59.000Z

295

FDM Helmholtz modeling of finite grating and waveguide width effects on resonant subwavelength grating reflectivity.  

SciTech Connect

Resonant subwavelength gratings (RSGs) may be used as narrow-band wavelength and angular reflectors. Rigorous coupled wave analysis (RCWA) predicts 100% reflectivity at the resonant frequency of an incident plane wave from an RSG of infinite extent. For devices of finite extent or for devices illuminated with a finite beam, the peak reflectivity drops, coupled with a broadening of the peak. More complex numerical methods are required to model these finite effects. We have modeled finite devices and finite beams with a two-dimensional finite difference Helmholtz equation. The effect of finite grating aperture and finite beam size are investigated. Specific cases considered include Gaussian beam illumination of an infinite grating, Gaussian illumination of a finite grating, and plane wave illumination of an apertured grating. For a wide grating with a finite Gaussian beam, it is found that the reflectivity is an exponential function of the grating width. Likewise, for an apertured grating the reflectivity shows an exponential decay with narrowing aperture size. Results are compared to other methods, including plane wave decomposition of Gaussian beams using RCWA for the case of a finite input beam, and a semi-analytical techniques for the case of the apertured grating.

Kemme, Shanalyn A.; Peters, David William; Hadley, G. Ronald

2003-07-01T23:59:59.000Z

296

C IV LINE-WIDTH ANOMALIES: THE PERILS OF LOW SIGNAL-TO-NOISE SPECTRA  

SciTech Connect

Comparison of six high-redshift quasar spectra obtained with the Large Binocular Telescope with previous observations from the Sloan Digital Sky Survey shows that failure to correctly identify absorption and other problems with accurate characterization of the C IV ?1549 emission line profile in low signal-to-noise (S/N) data can severely limit the reliability of single-epoch mass estimates based on the C IV emission line. We combine the analysis of these new high-quality data with a reanalysis of three other samples based on high-S/N spectra of the C IV emission line region. We find that a large scatter between the H?- and C IV-based masses remains even for this high-S/N sample when using the FWHM to characterize the broad-line region velocity dispersion and the standard virial assumption to calculate the mass. However, we demonstrate that using high-quality data and the line dispersion to characterize the C IV line width leads to a high level of consistency between C IV- and H?-based masses, with <0.3 dex of observed scatter and an estimated ?0.2 dex intrinsic scatter, in the mass residuals.

Denney, K. D.; Vestergaard, M. [Dark Cosmology Centre, Niels Bohr Institute, Juliane Maries Vej 30, DK-2100 Copenhagen Ø (Denmark); Pogge, R. W.; Kochanek, C. S.; Peterson, B. M. [Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210 (United States); Assef, R. J., E-mail: kelly@dark-cosmology.dk [Jet Propulsion Laboratory, California Institute of Technology, MS 169-530, 4800 Oak Grove Drive, Pasadena, CA 91109 (United States)

2013-09-20T23:59:59.000Z

297

Extreme Optimization Announcements  

E-Print Network (OSTI)

Extreme Optimization Announcements Assignment 3 due tomorrow @ 5pm. No late days on Extreme, we will hold extra office hours during regular section times. #12;Extreme Optimization Extreme University Fall 2014 #12;Extreme Optimization The radiotherapy problem Saving Lives: Radiotherapy Radiation

Chen, Yiling

298

Bridging the Efficiency Gap: Commercial Packaged Rooftop Air Conditioners  

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

Bridging the Efficiency Gap: Commercial Packaged Rooftop Air Conditioners Bridging the Efficiency Gap: Commercial Packaged Rooftop Air Conditioners Title Bridging the Efficiency Gap: Commercial Packaged Rooftop Air Conditioners Publication Type Conference Proceedings Year of Publication 2000 Authors Shugars, John, Philip Coleman, Christopher T. Payne, and Laura Van Wie McGrory Conference Name Proceedings from the 2000 ACEEE Summer Study on Energy Efficiency in Buildings Volume 10 Pagination 217-226 Date Published 01/2000 Abstract The energy efficiency ofmany products has increased markedly over the past decade. A conspicuous exception to this trend is commercialpackaged rooftop air conditioners, which have experiencedlittle to no efficiency improvement since 1992 when the Energy Policy Act of 1992 imposed federal minimum standards. Packaged rooftop units have been estimated to use on the order of76 billion kWh annually in the US, at a cost ofroughly $5.6 billion. Sales of these units are growing, and the majority of units sold have energy efficiency ratios (EERs) at orjust above the current national minimum efficiency standards. In this paper we document the static efficiencies ofcommercialpackaged air conditioners, explore the reasons behindthis efficiency gap, and assess opportunities for overcoming the barriers to efficiency improvements in these products.

299

BRIDGING THE GAP BETWEEN BUILDING SCIENCE AND DESIGN STUDIOS  

E-Print Network (OSTI)

in the building industry and, to be effective, they need to be integrated into architectural design from, there is a lack of courses that allow for integrated building design through consideration of multiple performanceBRIDGING THE GAP BETWEEN BUILDING SCIENCE AND DESIGN STUDIOS KONSTANTINOS PAPAMICHAEL AND VINEETA

300

RIFLE GAP RESERVOIR FISHERY INVESTIGATION Photo: Willow Hibbs  

E-Print Network (OSTI)

in western Colorado, hosts a popular recreational fishery. Historically, stocked rainbow and brown trout have Department of Fish, Wildlife and Conservation Biology, Colorado State University Tel: 970-491-5002 email, Wildlife and Conservation Biology, Colorado State University March 2009 #12;Rifle Gap Reservoir Fishery

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they are not comprehensive nor are they the most current set.
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to obtain the most current and comprehensive results.


301

Topology of Local Health Officials' Advice Networks: Mind the Gaps  

E-Print Network (OSTI)

, evidence-based programs, and service delivery, and health care reform are innovations Author AffiliationsTopology of Local Health Officials' Advice Networks: Mind the Gaps Jacqueline Merrill, RN, MPH: To determine how a health officials' advice network might contribute to a high-performing public health systems

Sadeh, Norman M.

302

Abstract Local Reasoning for Concurrent Libraries: Mind the Gap  

E-Print Network (OSTI)

considerable work on combining lo- cal reasoning with abstraction. There are two main approaches. One approach, truly abstract reasoning of a tree module (such as DOM) works with predicates based on connecting treeMFPS 2014 Abstract Local Reasoning for Concurrent Libraries: Mind the Gap Philippa Gardner, Azalea

Gardner, Philippa

303

Production and Width of the Pentaquark Theta+(1540) in Strangeness Production in the Proton-Proton System  

E-Print Network (OSTI)

We analyze recent experimental information on the excitation of the Theta+(1540) pentaquark in the hadronic reaction pp -> p Sigma+ K0. Upon describing the conventional production process - which serves as a normalization - in a meson exchange model, we estimate the resonant Theta+ induced cross section and the width of the pentaquark via K - exchange in a meson-baryon and a quark-gluon model. From a comparison with experiment we extract information on the width of the Theta+, the p Theta+ K0 coupling constant in the meson exchange and the relative s or p wave function for a nucleon-kaon cluster in the Theta+.

M. Dillig

2006-04-24T23:59:59.000Z

304

Fundamentals of a modified model of the distribution of neutron-resonance widths and results of its application in the mass-number range of 35 {<=} A {<=} 249  

SciTech Connect

A modified model is developed for describing the distribution of random resonance width for any nuclei. The model assumes the coexistence in a nucleus of one or several partial radiative and neutron amplitudes for respective resonance widths, these amplitudes differing in their parameters. Also, it is assumed that amplitude can be described by a Gaussian curve characterized by a nonzero mean value and a variance not equal to unity and that their most probable values can be obtained with the highest reliability from approximations of cumulative sums of respective widths. An analysis of data for 157 sets of neutron widths for 0 {<=} l {<=} 3 and for 56 sets of total radiative widths has been performed to date. The basic result of this analysis is the following: both for neutron and for total radiative widths, the experimental set of resonance width can be represented with a rather high probability in the form of a superposition of k {<=} 4 types differing in mean amplitude parameters.

Sukhovoj, A. M., E-mail: suchovoj@nf.jinr.ru; Khitrov, V. A., E-mail: khitrov@nf.jinr.ru [Joint Institute for Nuclear Research (Russian Federation)

2013-01-15T23:59:59.000Z

305

Optimization Online - Global Optimization Submissions - 2012  

E-Print Network (OSTI)

Proximal Point Method for Minimizing Quasiconvex Locally Lipschitz Functions ... Formulas for calculating the extremum ranks and inertias of a four-term quadratic ... Branch-and-Lift Algorithm for Deterministic Global Optimization in Nonlinear ...

306

Optimization Online - Nonlinear Optimization Submissions - 2012  

E-Print Network (OSTI)

Reformulation of a model for hierarchical divisive graph modularity ... Approximation of Matrix Rank Function and Its Application to Matrix Rank ... MSS: MATLAB software for L-BFGS trust-region subproblems for large-scale optimization

307

Distributionally Robust Convex Optimization - Optimization Online  

E-Print Network (OSTI)

1Imperial College Business School, Imperial College London, United Kingdom. 2College .... to biased optimization results with poor out-of-sample performance. ...... Question. Is there a vector y ? {0,1}. P such that Ey ? f and g y ? ?? ...... (

2013-09-22T23:59:59.000Z

308

Soft X-ray emission lines from photoionized accretion discs: constraints on their strength and width  

E-Print Network (OSTI)

We consider the properties of soft X-ray emission lines in the reprocessed emission from a photoionized accretion disc. Observations of these lines will be important in determining the ionization state and metallicity of the innermost regions of active galaxies. Calculations of reflection from a constant-density disc with an ionization parameter between 250 and 1000 erg cm/s show that emission from O VIII Ly\\alpha will dominate the soft X-ray emission spectrum. There is also significant emission from C VI, N VII, O VII, as well as Fe XVII--XIX. As the ionization parameter is increased these lines become weaker and are broadened by Compton scattering. Significantly increasing the O abundance primarily strengthens the O VII line, making it as large or larger than the O VIII line. The nitrogen and carbon lines are quite weak with equivalent widths (EWs) <30 eV, even with an increase in the N abundance. A hydrostatic ionized disc model has a more realistic density structure and shows a similar spectrum, but with the lines weaker and broader. This is a result of the hot ionized skin at the surface of the disc. We apply these results to the controversial claim of soft X-ray relativistic lines in the XMM-Newton spectrum of MCG--6-30-15. We are unable to find a situation where O VIII has the required EW without substantial emission from O VII. Furthermore, Compton scattering results in the blue wing of the O VIII line to be much broader than the << 10 eV drop observed in the data. We conclude that soft X-ray accretion disc lines will, in general, be weak and broad features and are unlikely to produce sharp edges in the data.

D. R. Ballantyne; R. R. Ross; A. C. Fabian

2002-02-07T23:59:59.000Z

309

Measuring the Invisible Higgs Width at the 7 and 8 TeV LHC  

E-Print Network (OSTI)

The LHC is well on track toward the discovery or exclusion of a light Standard Model (SM)-like Higgs boson. Such a Higgs has a very small SM width and can easily have large branching fractions to physics beyond the SM, making Higgs decays an excellent opportunity to observe new physics. Decays into collider-invisible particles are particularly interesting as they are theoretically well motivated and relatively clean experimentally. In this work we estimate the potential of the 7 and 8 TeV LHC to observe an invisible Higgs branching fraction. We analyze three channels that can be used to directly study the invisible Higgs branching ratio at the 7 TeV LHC: an invisible Higgs produced in association with (i) a hard jet; (ii) a leptonic Z; and (iii) forward tagging jets. We find that the last channel, where the Higgs is produced via weak boson fusion, is the most sensitive, allowing branching fractions as small as 40% to be probed at 20 inverse fb for masses in the range between 120 and 170 GeV, including in particular the interesting region around 125 GeV. We provide an estimate of the 8 TeV LHC sensitivity to an invisibly-decaying Higgs produced via weak boson fusion and find that the reach is comparable to but not better than the reach at the 7 TeV LHC. We further estimate the discovery potential at the 8 TeV LHC for cases where the Higgs has substantial branching fractions to both visible and invisible final states.

Yang Bai; Patrick Draper; Jessie Shelton

2011-12-19T23:59:59.000Z

310

Energy Optimizers USA | Open Energy Information  

Open Energy Info (EERE)

Optimizers USA Optimizers USA Jump to: navigation, search Name Energy Optimizers USA Address 6 S. 3rd Street Place Tipp City, Ohio Zip 45371 Sector Biomass, Carbon, Geothermal energy, Services, Solar, Wind energy Product Business and legal services;Consulting;Energy audits/weatherization; Engineering/architectural/design;Installation;Investment/finances; Trainining and education Phone number 937-877-1919 Website http://www.energyoptimizersusa Coordinates 39.9610217°, -84.1712945° 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":39.9610217,"lon":-84.1712945,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

311

Vehicle Technologies Office: Fact #516: April 28, 2008 The Petroleum Gap  

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

6: April 28, 6: April 28, 2008 The Petroleum Gap to someone by E-mail Share Vehicle Technologies Office: Fact #516: April 28, 2008 The Petroleum Gap on Facebook Tweet about Vehicle Technologies Office: Fact #516: April 28, 2008 The Petroleum Gap on Twitter Bookmark Vehicle Technologies Office: Fact #516: April 28, 2008 The Petroleum Gap on Google Bookmark Vehicle Technologies Office: Fact #516: April 28, 2008 The Petroleum Gap on Delicious Rank Vehicle Technologies Office: Fact #516: April 28, 2008 The Petroleum Gap on Digg Find More places to share Vehicle Technologies Office: Fact #516: April 28, 2008 The Petroleum Gap on AddThis.com... Fact #516: April 28, 2008 The Petroleum Gap In 1989 the transportation sector petroleum consumption surpassed U.S. petroleum production for the first time, creating a gap that must be met

312

Advanced Vacuum Clean Equipment Optimizer Ltd AVACO | Open Energy  

Open Energy Info (EERE)

Vacuum Clean Equipment Optimizer Ltd AVACO Vacuum Clean Equipment Optimizer Ltd AVACO Jump to: navigation, search Name Advanced Vacuum & Clean Equipment Optimizer Ltd (AVACO) Place Daegu, Daegu, Korea (Republic) Product Korean manufacturer of flat panel display equipments; makes sputtering equipment for cell manufacturing. Coordinates 35.88871°, 128.614868° 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":35.88871,"lon":128.614868,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

313

Central Networks Low Carbon Hub Optimizing renewable energy resources in  

Open Energy Info (EERE)

Networks Low Carbon Hub Optimizing renewable energy resources in Networks Low Carbon Hub Optimizing renewable energy resources in Lincolnshire (Smart Grid Project) Jump to: navigation, search Project Name Central Networks Low Carbon Hub Optimizing renewable energy resources in Lincolnshire Country United Kingdom Headquarters Location Lincolnshire, United Kingdom Coordinates 53.21788°, -0.19997° 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":53.21788,"lon":-0.19997,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

314

An Heuristic Drift-Based Model of the Power Scrape-Off Width in H-Mode Tokamaks  

SciTech Connect

An heuristic model for the plasma scrape-off width in H-mode plasmas is introduced. Grad B and curv B drifts into the SOL are balanced against sonic parallel flows out of the SOL, to the divertor plates. The overall mass flow pattern posited is a modification for open field lines of Pfirsch-Shlüter flows to include sinks to the divertors. These assumptions result in an estimated SOL width of 2a?p/R. They also result in a first-principles calculation of the particle confinement time of H-mode plasmas, qualitatively consistent with experimental observations. It is next assumed that anomalous perpendicular electron thermal diffusivity is the dominant source of heat flux across the separatrix, investing the SOL width, defined above, with heat from the main plasma. The separatrix temperature is calculated based on a two-point model balancing power input to the SOL with Spitzer-Härm parallel thermal conduction losses to the divertor. This results in an heuristic closed-form prediction for the power scrape-off width that is in remarkable quantitative agreement both in absolute magnitude and in scaling with recent experimental data. Further work should include full numerical calculations, including all magnetic and electric drifts, as well as more thorough comparison with experimental data.

Robert J. Goldston

2011-02-28T23:59:59.000Z

315

Heuristic Drift-based Model of the Power Scrape-off width in H-mode Tokamaks  

SciTech Connect

An heuristic model for the plasma scrape-off width in H-mode plasmas is introduced. Grad B and curv B drifts into the SOL are balanced against sonic parallel flows out of the SOL, to the divertor plates. The overall particle flow pattern posited is a modification for open field lines of Pfirsch-Shlüter flows to include sinks to the divertors. These assumptions result in an estimated SOL width of ~ 2a?p/R. They also result in a first-principles calculation of the particle confinement time of H-mode plasmas, qualitatively consistent with experimental observations. It is next assumed that anomalous perpendicular electron thermal diffusivity is the dominant source of heat flux across the separatrix, investing the SOL width, defined above, with heat from the main plasma. The separatrix temperature is calculated based on a two-point model balancing power input to the SOL with Spitzer-Härm parallel thermal conduction losses to the divertor. This results in a heuristic closed-form prediction for the power scrape-off width that is in reasonable quantitative agreement both in absolute magnitude and in scaling with recent experimental data from deuterium plasmas. Further work should include full numerical calculations, including all magnetic and electric drifts, as well as more thorough comparison with experimental data.

Robert J. Goldston

2011-04-29T23:59:59.000Z

316

Measurement of the masses and widths of the bottom baryons ?b[superscript ±] and ?b*[superscript ±  

E-Print Network (OSTI)

Using data from pp? collisions at ?s=1.96??TeV recorded by the CDF II detector at the Fermilab Tevatron, we present improved measurements of the masses and first measurements of natural widths of the four bottom baryon ...

Gomez-Ceballos, Guillelmo

317

Pump pulse-width dependence of grazing-incidence pumped transient collisional soft-x-ray lasers M. Berrill,1  

E-Print Network (OSTI)

Pump pulse-width dependence of grazing-incidence pumped transient collisional soft-x-ray lasers M 2007 The output energy dependence of high repetition rate grazing incidence pumped Ni-like Mo, Ni-like Ag, and Ne-like Ti transient collisional soft x-ray lasers on the duration of the pump pulse

Rocca, Jorge J.

318

Layering as Optimization Decomposition 3-1 Layering as OptimizationLayering as Optimization  

E-Print Network (OSTI)

1 Layering as Optimization Decomposition 3-1 Layering as OptimizationLayering as Optimization DecompositionDecomposition Layering as Optimization Decomposition 3-2 CONTENTSCONTENTS Introduction (Marta;2 Layering as Optimization Decomposition 3-3 Layering as Optimization Decomposition Introduction By Marta

Fan, Xingzhe

319

Energy optimization system  

DOE Patents (OSTI)

A system for optimizing customer utility usage in a utility network of customer sites, each having one or more utility devices, where customer site is communicated between each of the customer sites and an optimization server having software for optimizing customer utility usage over one or more networks, including private and public networks. A customer site model for each of the customer sites is generated based upon the customer site information, and the customer utility usage is optimized based upon the customer site information and the customer site model. The optimization server can be hosted by an external source or within the customer site. In addition, the optimization processing can be partitioned between the customer site and an external source.

Zhou, Zhi; de Bedout, Juan Manuel; Kern, John Michael; Biyik, Emrah; Chandra, Ramu Sharat

2013-01-22T23:59:59.000Z

320

Developing Secure Power Systems Professional Competence: Alignment and Gaps  

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

Developing Secure Power Systems Professional Competence: Alignment Developing Secure Power Systems Professional Competence: Alignment and Gaps in Workforce Development Programs - Phase 2 (July/August 2013) Developing Secure Power Systems Professional Competence: Alignment and Gaps in Workforce Development Programs - Phase 2 (July/August 2013) DOE has recognized that the electricity industry needs workforce development resources that can aid in the accelerating need for Secure Power Systems Professionals, while at the same time identifying capabilities and competencies to protect and enable the modernized grid currently being built. In the spring of 2011 a project was initiated to identify those capabilities and competencies along with assessing the need and qualifications for a certification program for Secure Power Systems

Note: This page contains sample records for the topic "optimal gap width" 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

Microsoft Word - IMBA Gap Analysis Final 20060831.doc  

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

DOE/EH-0711 DOE/EH-0711 Gap Analysis for IMBA and DOE Safety Software Central Registry Recommendation Final U.S. Department of Energy Office of Environment, Safety and Health 1000 Independence Avenue, S.W. Washington, D.C. 20585-2040 August 2006 DOE/EH-0711 i INTENTIONALLY BLANK DOE/EH-0711 ii FOREWORD This report documents the outcome of an evaluation of the safety software quality assurance attributes of the Integrated Modules for Bioassay Analysis (IMBA) Expert (tm) USDOE-Edition and Professional Plus computer products relative to the safety software requirements identified in DOE O 414.1C, Quality Assurance. This evaluation, a gap analysis, is performed according to DOE G 414.1-4 and is a requisite

322

Band-Gap Engineering of Carbon Nanotubes with Grain Boundaries  

SciTech Connect

Structure and electronic properties of carbon nanotubes (CNTs) with grain boundaries (GBs) are investigated using density-functional calculations, where the GBs parallel and perpendicular to the tube axis are considered. Simulation results show that the GBs have a great effect on the electronic properties of the CNTs. For the GBs along the tube axis, the CNTs are narrow or zero band gap (<0.16 eV) materials, independent of the misorientation angle and diameter. For the GBs perpendicular to the tube axis, localized electronic states appear within the GBs regions, leading to a larger band gap of up to 0.6 eV. It is convenient to transport and localize the electrons and holes by engineering the GBs. These findings are of great significance for developing carbon-based nanomaterials and electronic devices.

Wang, Zhiguo; Zhou, Yungang; Zhang, Yanwen; Gao, Fei

2012-01-26T23:59:59.000Z

323

Damping of lower hybrid waves in large spectral gap configurations  

SciTech Connect

Extensive experimental data support reliable power deposition and current drive by lower-hybrid (LH) waves in conditions where a large spectral gap exists between the nominal parallel index of refraction prescribed by the antenna characteristics and phasing, and that required for significant Landau damping to take place. We argue that only a significant modification of the initial spectrum at the plasma edge could explain experimental observations. Based on this assumption, a new prescription for reliable simulations of LH current drive using ray-tracing and Fokker-Planck modelling is proposed. A remarkable agreement between experimental observations in the Tore Supra tokamak and simulations is obtained for relevant parametric scans, including electron density and LH waveguide phasing. In an effort to investigate the possible role of fluctuations, it is shown that the spectral gap can be bridged dynamically in the presence of a fluctuating LH spectrum.

Decker, J.; Peysson, Y.; Artaud, J.-F.; Nilsson, E.; Ekedahl, A.; Goniche, M.; Hillairet, J.; Mazon, D. [CEA, IRFM, F-13108 Saint Paul lez Durance (France)

2014-02-12T23:59:59.000Z

324

Valley pair qubits in double quantum dots of gapped graphene  

E-Print Network (OSTI)

The rise of graphene opens a new door to qubit implementation, as discussed in the recent proposal of valley pair qubits in double quantum dots of gapped graphene (Wu et al., arXiv: 1104.0443 [cond-mat.mes-hall]). The work here presents the comprehensive theory underlying the proposal. It discusses the interaction of electrons with external magnetic and electric fields in such structures. Specifically, it examines a strong, unique mechanism, i.e., the analogue of the 1st-order relativistic effect in gapped graphene. This mechanism is state mixing free and allows, together with the electrically tunable exchange coupling, a fast, all-electric manipulation of qubits via electric gates, in the time scale of ns. The work also looks into the issue of fault tolerance in a typical case, yielding at 10oK a long qubit coherence time (~O(ms)).

G. Y. Wu; N. -Y. Lue; L. Chang

2011-07-03T23:59:59.000Z

325

The information gap in corporate annual reports: evidence from Egypt  

Science Journals Connector (OSTI)

This study explores whether an information gap exists for six types of corporate disclosure in Egypt, where International Accounting Standards (IAS) apply but penalties for non-compliance are limited. It also investigates whether low compliance with mandatory disclosure can be explained by low levels of demand for this type of information among local financial analysts. The results identify a significant gap between actual disclosure practices of companies for various types of disclosure and market perceptions of this practice. Our findings also suggest that low compliance with disclosure requirements in Egypt is not driven by low levels of demand from local financial analysts, because these items of information are perceived as useful for investment decision making.

Omaima A.G. Hassan; Gianluigi Giorgioni; Peter Romilly; David M. Power

2012-01-01T23:59:59.000Z

326

Band-Gap Engineering of Carbon Nanotubes with Grain Boundaries  

SciTech Connect

Structure and electronic properties of carbon nanotubes (CNTs) with grain boundaries (GBs) are investigated using density-functional calculations, where the GBs parallel and perpendicular to the tube axis are considered. Simulation results show that the GBs have a great effect on the electronic properties of the CNTs. For the GBs along the tube axis, the CNTs are narrow or zero band gap (<0.16 eV) materials, independent of the misoritentaion angle and diameter. For the GBs perpendicular to the tube axis, localized electronic states appear within the GBs regions, leading to a larger band gap of up to 0.6 eV. It is convenient to transport and localize the electrons and holes by engineering the GBs. These findings are of great significance for developing carbon-based nanomaterials and electronic devices.

Wang, Zhiguo [Department of Applied Physics, University of Electronic Science and Technology of China; Zhou, Yungang [Department of Applied Physics, University of Electronic Science and Technology of China; Zhang, Yanwen [ORNL; Gao, Fei [ORNL

2011-01-01T23:59:59.000Z

327

Spark gap switch system with condensable dielectric gas  

DOE Patents (OSTI)

A spark gap switch system is disclosed which is capable of operating at a high pulse rate comprising an insulated switch housing having a purging gas entrance port and a gas exit port, a pair of spaced apart electrodes each having one end thereof within the housing and defining a spark gap therebetween, an easily condensable and preferably low molecular weight insulating gas flowing through the switch housing from the housing, a heat exchanger/condenser for condensing the insulating gas after it exits from the housing, a pump for recirculating the condensed insulating gas as a liquid back to the housing, and a heater exchanger/evaporator to vaporize at least a portion of the condensed insulating gas back into a vapor prior to flowing the insulating gas back into the housing.

Thayer, III, William J. (Kent, WA)

1991-01-01T23:59:59.000Z

328

Optimal phase estimation with arbitrary a priori knowledge  

SciTech Connect

The optimal-phase estimation strategy is derived when partial a priori knowledge on the estimated phase is available. The solution is found with the help of the most famous result from the entanglement theory: the positive partial transpose criterion. The structure of the optimal measurements, estimators, and the optimal probe states is analyzed. This Rapid Communication provides a unified framework bridging the gap in the literature on the subject which until now dealt almost exclusively with two extreme cases: almost perfect knowledge (local approach based on Fisher information) and no a priori knowledge (global approach based on covariant measurements). Special attention is paid to a natural a priori probability distribution arising from a diffusion process.

Demkowicz-Dobrzanski, Rafal [Faculty of Physics, University of Warsaw, ul. Hoza 69, PL-00-681 Warszawa (Poland)

2011-06-15T23:59:59.000Z

329

2009 - Optimization Online  

E-Print Network (OSTI)

Modeling the Mobile Oil Recovery Problem as a Multiobjective Vehicle Routing Problem ... Optimal Security Response to Attacks on Open Science Grids

330

E85 Optimized Engine  

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

of work * Approach * Barriers * Performance Measures and Accomplishments * Technology Transfer * Plans for Next Fiscal Year * Summary 2 E85 Optimized Purpose of Work Engine *...

331

3531.ps - Optimization Online  

E-Print Network (OSTI)

Jul 13, 2012 ... Stochastic optimization of a multireservoir hydroelectric system : A decomposition approach. Water Ressource Research, 21(6):779–792, June ...

2012-07-13T23:59:59.000Z

332

Postscript - Optimization Online  

E-Print Network (OSTI)

Technical Report R-6469, AERE Harwell Labo-. ratory, Harwell, Oxfordshire, England, 1970. [21] M. J. D. Powell. A new algorithm for unconstrained optimization ...

333

Euler's fluid equations: Optimal Control vs Optimization  

E-Print Network (OSTI)

An optimization method used in image-processing (metamorphosis) is found to imply Euler's equations for incompressible flow of an inviscid fluid, without requiring that the Lagrangian particle labels exactly follow the flow lines of the Eulerian velocity vector field. Thus, an optimal control problem and an optimization problem for incompressible ideal fluid flow both yield the \\emph {same} Euler fluid equations, although their Lagrangian parcel dynamics are \\emph{different}. This is a result of the \\emph{gauge freedom} in the definition of the fluid pressure for an incompressible flow, in combination with the symmetry of fluid dynamics under relabeling of their Lagrangian coordinates. Similar ideas are also illustrated for SO(N) rigid body motion.

Darryl D. Holm

2009-09-28T23:59:59.000Z

334

Technical Standards, CFAST-Gap Analysis - May 3, 2004 | Department of  

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

Gap Analysis - May 3, 2004 Gap Analysis - May 3, 2004 Technical Standards, CFAST-Gap Analysis - May 3, 2004 May 3, 2004 DOE-EH-4.2.1.3-CFAST-Gap Analysis, Software Quality Assurance Improvement Plan: CFAST Gap Analysis This report documents the outcome of an evaluation of the Software Quality Assurance (SQA) attributes of the CFAST computer code for accident analysis applications, relative to established requirements. This evaluation, a "gap analysis," is performed to meet commitment 4.2.1.3 of the Department of Energy's Implementation Plan to resolve SQA issues identified in the Defense Nuclear Facilities Safety Board Recommendation 2002-1. Technical Standards, CFAST-Gap Analysis More Documents & Publications Technical Standards, CFAST-Code Guidance - July 23, 2004 Technical Standards, MELCOR - Gap Analysis - May 3, 2004

335

Vehicle Technologies Office: Fact #414: March 6, 2006 The Petroleum Gap  

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

4: March 6, 2006 4: March 6, 2006 The Petroleum Gap to someone by E-mail Share Vehicle Technologies Office: Fact #414: March 6, 2006 The Petroleum Gap on Facebook Tweet about Vehicle Technologies Office: Fact #414: March 6, 2006 The Petroleum Gap on Twitter Bookmark Vehicle Technologies Office: Fact #414: March 6, 2006 The Petroleum Gap on Google Bookmark Vehicle Technologies Office: Fact #414: March 6, 2006 The Petroleum Gap on Delicious Rank Vehicle Technologies Office: Fact #414: March 6, 2006 The Petroleum Gap on Digg Find More places to share Vehicle Technologies Office: Fact #414: March 6, 2006 The Petroleum Gap on AddThis.com... Fact #414: March 6, 2006 The Petroleum Gap Since 1989, the transportation sector alone has used more petroleum than the United States produces. The current projections indicate that by the

336

Fact #837: September 8, Gap between Net Imports and Total Imports...  

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

7: September 8, Gap between Net Imports and Total Imports of Petroleum is Widening Fact 837: September 8, Gap between Net Imports and Total Imports of Petroleum is Widening Net...

337

Nanoscale gap filling for phase change material by pulsed deposition and inductively coupled plasma etching  

Science Journals Connector (OSTI)

The gap filling of phase change material has become a critical module in the fabrication process of phase change random access memory (PCRAM) as the ... . We achieved void free gap filling of phase change material

W. C. Ren; B. Liu; Z. T. Song; X. Z. Jing; B. C. Zhang; Y. H. Xiang…

2013-09-01T23:59:59.000Z

338

Engineered nanomaterials: knowledge gaps in fate, exposure, toxicity, and future directions  

Science Journals Connector (OSTI)

The aim of this study is to identify current knowledge gaps in fate, exposure, and toxicity of engineered nanomaterials (ENMs), highlight research gaps, and suggest future research directions. Humans and other living organisms are exposed to ENMs during ...

Arun Kumar, Prashant Kumar, Ananthitha Anandan, Teresa F. Fernandes, Godwin A. Ayoko, George Biskos

2014-01-01T23:59:59.000Z

339

Variation of treefall gap characteristics in an East Texas bottomland hardwood forest: effects of microtopography  

E-Print Network (OSTI)

Treefall gaps, formed as a result of small-scale disturbances, allow seedling recruitment and growth in late-successional forests. Many factors contribute to gap regime heterogeneity within and among forest stands, including wind and fire patterns...

Almquist, Benjamin Eric

1998-01-01T23:59:59.000Z

340

Of horseshoes and heliotropes: Dynamics of dust in the Encke Gap M.M. Hedman a,  

E-Print Network (OSTI)

Of horseshoes and heliotropes: Dynamics of dust in the Encke Gap M.M. Hedman a, , J.A. Burns a located within the Cassini Division's Laplace Gap demonstrates ``heliotropic'' behavior: its geometric

Hamilton, Douglas P.

Note: This page contains sample records for the topic "optimal gap width" 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

Controlling electrode gap during vacuum arc remelting at low melting current  

DOE Patents (OSTI)

An apparatus and method are disclosed for controlling electrode gap in a vacuum arc remelting furnace, particularly at low melting currents. Spectrographic analysis is performed of the metal vapor plasma, from which estimates of electrode gap are derived. 5 figs.

Williamson, R.L.; Zanner, F.J.; Grose, S.M.

1997-04-15T23:59:59.000Z

342

Optical absorption and band gap reduction in (Fe1-xCrx)2O3 solid...  

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

Optical absorption and band gap reduction in (Fe1-xCrx)2O3 solid solutions: A first-principles study. Optical absorption and band gap reduction in (Fe1-xCrx)2O3 solid solutions: A...

343

Vehicle Technologies Office: Fact #465: April 16, 2007 The Petroleum Gap  

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

5: April 16, 5: April 16, 2007 The Petroleum Gap to someone by E-mail Share Vehicle Technologies Office: Fact #465: April 16, 2007 The Petroleum Gap on Facebook Tweet about Vehicle Technologies Office: Fact #465: April 16, 2007 The Petroleum Gap on Twitter Bookmark Vehicle Technologies Office: Fact #465: April 16, 2007 The Petroleum Gap on Google Bookmark Vehicle Technologies Office: Fact #465: April 16, 2007 The Petroleum Gap on Delicious Rank Vehicle Technologies Office: Fact #465: April 16, 2007 The Petroleum Gap on Digg Find More places to share Vehicle Technologies Office: Fact #465: April 16, 2007 The Petroleum Gap on AddThis.com... Fact #465: April 16, 2007 The Petroleum Gap (Revised April 18, 2007) Since 1989, the transportation sector alone has used more petroleum than

344

Toward optimized code generation through model-based optimization  

E-Print Network (OSTI)

Toward optimized code generation through model- based optimization Asma Charfi, Chokri Mraidha with in RTES development is linked to the optimization of their software part. Although automatic code generation and the use of optimizing compilers bring some answers to application optimization issue, we

Paris-Sud XI, Université de

345

Thermal Fluid Multiphysics Optimization of Spherical Tokamak  

SciTech Connect

An experimental Fusion Nuclear Science Facility (FNSF) is required that will create the environment that simultaneously achieves high energy neutrons and high ion fluence necessary in order to bridge the gaps from ITER to the realization of a fusion nuclear power plant. One concept for achieving this is a high duty cycle spherical torus. This study will focus on thermal modeling of the spherical torus centerpost using computational fluid dynamics to effectively model the thermal transfer of the cooling fluid to the centerpost. The design of the fluid channels is optimized in order to minimize the temperature in the centerpost. Results indicate the feasibility of water cooling for a long-pulse spherical torus FNSF.

Lumsdaine, Arnold [ORNL; Tipton, Joseph B [ORNL; Peng, Yueng Kay Martin [ORNL

2012-01-01T23:59:59.000Z

346

Wide-gap a-Si:H fabricated by controlling voids  

SciTech Connect

High quality wide gap hydrogenated amorphous silicon has been prepared using the chemical annealing technique. It was possible to prepare materials with band gaps ranging 1.8 to 2.1 eV by varying the preparation parameters. Low defect densities less than (3--8) {times} 10{sup 15} cm{sup {minus}3} could be maintained over the entire band gap range. Improved stability for light soaking was also observed in the wide gap materials.

Yoshino, K.; Futako, W.; Wasai, Y.; Shimizu, I. [Tokyo Inst. of Tech., Yokohama (Japan). Graduate School

1996-12-31T23:59:59.000Z

347

Electric strength of the accelerating gap of a plasma electron source at rough vacuum  

Science Journals Connector (OSTI)

Conditions for the electric breakdown of the accelerating gap of a plasma electron source are determined. It is shown that,...

V. A. Burdovitsin; M. N. Kuzemchenko; E. M. Oks

2002-07-01T23:59:59.000Z

348

OIKOS 101: 499504, 2003 Do seedlings in gaps interact? A field test of assumptions in ESS  

E-Print Network (OSTI)

OIKOS 101: 499­504, 2003 Do seedlings in gaps interact? A field test of assumptions in ESS seed seedlings in gaps interact? A field test of assumptions in ESS seed size models. ­ Oikos 101: 499­504. ESS for the occupancy of `safe sites' or vegetation gaps. If mortality rates are high and/or frequency-independent, ESS

Silvertown, Jonathan

349

The Quasi-Distributed Gap Technique for Planar Inductors-Design Guidelines  

E-Print Network (OSTI)

The Quasi-Distributed Gap Technique for Planar Inductors-Design Guidelines Jiankun Hu C. R The Quasi-Distributed Gap Technique for Planar Inductors: Design Guidelines Jiankun Hu Charles R. Sullivan of low-permeability magnetic material to form a uniformly distributed gap can facilitate the design

350

Penetration of plasma into the wafer-focus ring gap in capacitively coupled plasmas  

E-Print Network (OSTI)

Penetration of plasma into the wafer-focus ring gap in capacitively coupled plasmas Natalia Y of capacitively coupled plasma reactors with a wafer-focus ring gap. The penetration of plasma generated species i.e., ions and radicals into the wafer-focus ring gap is discussed. We found that the penetration of plasma

Kushner, Mark

351

THE DEVIL’S STAIRCASE DIMENSIONS AND MEASURE-THEORETICAL ENTROPY OF MAPS WITH HORIZONTAL GAP  

E-Print Network (OSTI)

Abstract. This work elucidates the measure-theoretical entropy and dimensions of a unimodal map with a horizontal gap. The measure-theoretical entropy and dimensions of the Ft (which is defined later)are shown to form a devil’s staircase structure with respect to the gap size t. Pesin’s formula for gap maps is also considered. 1.

Jung-chao Ban; Song-sun Lin

352

The response of the width of the Hadley cell to global warming-like thermal forcing in a simple general circulation model.  

E-Print Network (OSTI)

??The response of the Hadley Cell (HC) width to the global warming is investigated using a set of dry global circulation model (GCM) integrations. In… (more)

Lin, Nai Shi

2011-01-01T23:59:59.000Z

353

Reverse Osmosis Optimization  

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

Report assesses techniques for optimizing reverse osmosis (RO) systems to increase RO system performance and water efficiency. It provides a general description of RO systems, the influence of RO systems on water use, and key areas where RO systems can be optimized to reduce water and energy consumption.

354

Optimization Online Digest -- December 2014  

E-Print Network (OSTI)

Elcin Cetinkaya, Aurelie Thiele Information Gap Decision Theory Based OPF With HVDC Connected Wind Farms rabiee abbas, Alireza Soroudi, andrew keane.

355

Target design optimization for an electron accelerator driven subcritical facility with circular and square beam profiles.  

SciTech Connect

A subcritical facility driven by an electron accelerator is planned at the Kharkov Institute of Physics and Technology (KIPT) in Ukraine for medical isotope production, materials research, training, and education. The conceptual design of the facility is being pursued through collaborations between ANL and KIPT. As part of the design effort, the high-fidelity analyses of various target options are performed with formulations to reflect the realistic configuration and the three dimensional geometry of each design. This report summarizes the results of target design optimization studies for electron beams with two different beam profiles. The target design optimization is performed via the sequential neutronic, thermal-hydraulic, and structural analyses for a comprehensive assessment of each configuration. First, a target CAD model is developed with proper emphasis on manufacturability to provide a basis for separate but consistent models for subsequent neutronic, thermal-hydraulic, and structural analyses. The optimizations are pursued for maximizing the neutron yield, streamlining the flow field to avoid hotspots, and minimizing the thermal stresses to increase the durability. In addition to general geometric modifications, the inlet/outlet channel configurations, target plate partitioning schemes, flow manipulations and rates, electron beam diameter/width options, and cladding material choices are included in the design optimizations. The electron beam interactions with the target assembly and the neutronic response of the subcritical facility are evaluated using the MCNPX code. the results for the electron beam energy deposition, neutron generation, and utilization in the subcritical pile are then used to characterize the axisymmetric heat generation profiles in the target assembly with explicit simulations of the beam tube, the coolant, the clad, and the target materials. Both tungsten and uranium are considered as target materials. Neutron spectra from tungsten and uranium are very similar allowing the use of either material in the subcritical assembly without changing its characteristics. However, the uranium target has a higher neutron yield, which increases the neutron flux of the subcritical assembly. Based on the considered dimensions and heat generation profiles, the commercial CFD software Star-CD is used for the thermal-hydraulic analysis of each target design to satisfy a set of thermal criteria, the most limiting of which being to maintain the water temperature 50 below the boiling point. It is found that the turbulence in the inlet channels dissipates quickly in narrow gaps between the target plates and, as a result, the heat transfer is limited by the laminar flow conditions. On average, 3-D CFD analyses of target assemblies agree well with 1-D calculations using RELAP (performed by KIPT). However, the recirculation and stagnation zones predicted with the CFD models prove the importance of a 3-D analysis to avoid the resulting hotspots. The calculated temperatures are subsequently used for the structural analysis of each target configuration to satisfy the other engineering design requirements. The thermo-structural calculations are performed mostly with NASTRAN and the results occasionally compared with the results from MARC. Both, NASTRAN and MARC are commercially available structural-mechanics analysis software. Although, a significant thermal gradient forms in target elements along the beam direction, the high thermal stresses are generally observed peripherally around the edge of thin target disks/plates. Due to its high thermal conductivity, temperatures and thermal stresses in tungsten target are estimated to be significantly lower than in uranium target. The deformations of the target disks/plates are found to be insignificant, which eliminate concerns for flow blockages in narrow coolant channels. Consistent with the specifications of the KIPT accelerator to be used in this facility, the electron beam power is 100-kW with electron energy in the range of 100 to 200 MeV. As expected, the 100 MeV el

Gohar, M. Y. A; Sofu, T.; Zhong, Z.; Belch, H.; Naberezhnev, D.; Nuclear Engineering Division

2008-10-30T23:59:59.000Z

356

Measurements of the mass and width of the eta_c using psi' -> gamma eta_c  

E-Print Network (OSTI)

The mass and width of the lowest lying S-wave spin singlet charmonium state, the eta_c, are measured using a data sample of 1.06x10^8 psi' decays collected with the BESIII detector at the BEPCII storage ring. We use a model that incorporates interference between the signal reaction, psi' -> gamma eta_c, and a non-resonant radiative background to successfully describe the line shape of the eta_c. We measure the eta_c mass to be 2984.3 +- 0.6 +- 0.6 MeV/c^2 and the total width to be 32.0 +- 1.2 +- 1.0 MeV, where the first errors are statistical and the second are systematic.

BESIII Collaboration; M. Ablikim; M. N. Achasov; D. Alberto; D. J. Ambrose; F. F. An; Q. An; Z. H. An; J. Z. Bai; R. B. Ferroli; Y. Ban; J. Becker; N. Berger; M. B. Bertani; J. M. Bian; E. Bogera; O. Bondarenko; I. Boyko; R. A. Briere; V. Bytev; X. Cai; A. C. Calcaterra; G. F. Cao; J. F. Chang; G. Chelkova; G. Chen; H. S. Chen; H. X. Chen; J. C. Chen; M. L. Chen; S. J. Chen; Y. Chen; Y. B. Chen; H. P. Cheng; Y. P. Chu; D. Cronin-Hennessy; H. L. Dai; J. P. Dai; D. Dedovich; Z. Y. Deng; I. Denysenkob; M. Destefanis; W. L. Ding; Y. Ding; L. Y. Dong; M. Y. Dong; S. X. Du; J. Fang; S. S. Fang; C. Q. Feng; C. D. Fu; J. L. Fu; Y. Gao; C. Geng; K. Goetzen; W. X. Gong; M. Greco; M. H. Gu; Y. T. Gu; Y. H. Guan; A. Q. Guo; L. B. Guo; Y. P. Guo; Y. L. Han; X. Q. Hao; F. A. Harris; K. L. He; M. He; Z. Y. He; Y. K. Heng; Z. L. Hou; H. M. Hu; J. F. Hu; T. Hu; B. Huang; G. M. Huang; J. S. Huang; X. T. Huang; Y. P. Huang; T. Hussain; C. S. Ji; Q. Ji; X. B. Ji; X. L. Ji; L. K. Jia; L. L. Jiang; X. S. Jiang; J. B. Jiao; Z. Jiao; D. P. Jin; S. Jin; F. F. Jing; N. Kalantar-Nayestanaki; M. Kavatsyuk; W. Kuehn; W. Lai; J. S. Lange; J. K. C. Leung; C. H. Li; Cheng Li; Cui Li; D. M. Li; F. Li; G. Li; H. B. Li; J. C. Li; K. Li; Lei Li; N. B. Li; Q. J. Li; S. L. Li; W. D. Li; W. G. Li; X. L. Li; X. N. Li; X. Q. Li; X. R. Li; Z. B. Li; H. Liang; Y. F. Liang; Y. T. Liang; G. R. Liao; X. T. Liao; B. J. Liu; C. L. Liu; C. X. Liu; C. Y. Liu; F. H. Liu; Fang Liu; Feng Liu; H. Liu; H. B. Liu; H. H. Liu; H. M. Liu; H. W. Liu; J. P. Liu; K. Liu; K. Liu; K. Y. Liu; Q. Liu; S. B. Liu; X. Liu; X. H. Liu; Y. B. Liu; Yong Liu; Z. A. Liu; Zhiqiang Liu; Zhiqing Liu; H. Loehner; G. R. Lu; H. J. Lu; J. G. Lu; Q. W. Lu; X. R. Lu; Y. P. Lu; C. L. Luo; M. X. Luo; T. Luo; X. L. Luo; M. Lv; C. L. Ma; F. C. Ma; H. L. Ma; Q. M. Ma; S. Ma; T. Ma; X. Y. Ma; M. Maggiora; Q. A. Malik; H. Mao; Y. J. Mao; Z. P. Mao; J. G. Messchendorp; J. Min; T. J. Min; R. E. Mitchell; X. H. Mo; N. Yu. Muchnoi; Y. Nefedov; I. B. Nikolaev; Z. Ning; S. L. Olsen; Q. Ouyang; S. P. Pacettic; J. W. Park; M. Pelizaeus; K. Peters; J. L. Ping; R. G. Ping; R. Poling; C. S. J. Pun; M. Qi; S. Qian; C. F. Qiao; X. S. Qin; J. F. Qiu; K. H. Rashid; G. Rong; X. D. Ruan; A. Sarantsevd; J. Schulze; M. Shao; C. P. Shene; X. Y. Shen; H. Y. Sheng; M. R. Shepherd; X. Y. Song; S. Spataro; B. Spruck; D. H. Sun; G. X. Sun; J. F. Sun; S. S. Sun; X. D. Sun; Y. J. Sun; Y. Z. Sun; Z. J. Sun; Z. T. Sun; C. J. Tang; X. Tang; E. H. Thorndike; H. L. Tian; D. Toth; G. S. Varner; B. Wang; B. Q. Wang; K. Wang; L. L. Wang; L. L. Wang; L. S. Wang; M. Wang; P. Wang; P. L. Wang; Q. Wang; Q. J. Wang; S. G. Wang; X. F. Wang; X. L. Wang; Y. D. Wang; Y. F. Wang; Y. Q. Wang; Z. Wang; Z. G. Wang; Z. Y. Wang; D. H. Wei; Q. G. Wen; S. P. Wen; U. Wiedner; L. H. Wu; N. Wu; W. Wu; Z. Wu; Z. J. Xiao; Y. G. Xie; Q. L. Xiu; G. F. Xu; G. M. Xu; H. Xu; Q. J. Xu; X. P. Xu; Y. Xu; Z. R. Xu; Z. Xue; L. Yan; W. B. Yan; Y. H. Yan; H. X. Yang; T. Yang; Y. Yang; Y. X. Yang; H. Ye; M. Ye; M. H. Ye; B. X. Yu; C. X. Yu; S. P. Yu; C. Z. Yuan; W. L. Yuan; Y. Yuan; A. A. Zafar; A. Z. Zallo; Y. Zeng; B. X. Zhang; B. Y. Zhang; C. C. Zhang; D. H. Zhang; H. H. Zhang; H. Y. Zhang; J. Zhang; J. Q. Zhang; J. W. Zhang; J. Y. Zhang; J. Z. Zhang; L. Zhang; S. H. Zhang; T. R. Zhang; X. J. Zhang; X. Y. Zhang; Y. Zhang; Y. H. Zhang; Y. S. Zhang; Z. P. Zhang; Z. Y. Zhang; G. Zhao; H. S. Zhao; Jingwei Zhao; Lei Zhao; Ling Zhao; M. G. Zhao; Q. Zhao; S. J. Zhao; T. C. Zhao; X. H. Zhao; Y. B. Zhao; Z. G. Zhao; A. Zhemchugova; B. Zheng; J. P. Zheng; Y. H. Zheng; Z. P. Zheng; B. Zhong; J. Zhong; L. Zhou; X. K. Zhou; X. R. Zhou; C. Zhu; K. Zhu; K. J. Zhu; S. H. Zhu; X. L. Zhu; X. W. Zhu; Y. S. Zhu; Z. A. Zhu; J. Zhuang; B. S. Zou; J. H. Zou; J. X. Zuo

2011-11-02T23:59:59.000Z

357

Investigation of channel width-dependent threshold voltage variation in a-InGaZnO thin-film transistors  

SciTech Connect

This Letter investigates abnormal channel width-dependent threshold voltage variation in amorphous indium-gallium-zinc-oxide (a-IGZO) thin-film transistors. Unlike drain-induced source barrier lowering effect, threshold voltage increases with increasing drain voltage. Furthermore, the wider the channel, the larger the threshold voltage observed. Because of the surrounding oxide and other thermal insulating material and the low thermal conductivity of the IGZO layer, the self-heating effect will be pronounced in wider channel devices and those with a larger operating drain bias. To further clarify the physical mechanism, fast IV measurement is utilized to demonstrate the self-heating induced anomalous channel width-dependent threshold voltage variation.

Liu, Kuan-Hsien; Chou, Wu-Ching [Department of Electrophysics, National Chiao Tung University, Hsinchu, Taiwan (China); Chang, Ting-Chang, E-mail: tcchang@mail.phys.nsysu.edu.tw [Department of Physics, National Sun Yat-Sen University, Kaohsiung 804, Taiwan (China); Advanced Optoelectronics Technology Center, National Cheng Kung University, Taiwan (China); Wu, Ming-Siou; Hung, Yi-Syuan; Sze, Simon M. [Department of Electronics Engineering, National Chiao Tung University, Hsinchu, Taiwan (China); Hung, Pei-Hua; Chu, Ann-Kuo [Department of Photonics, National Sun Yat-Sen University, Kaohsiung 804, Taiwan (China); Hsieh, Tien-Yu [Department of Physics, National Sun Yat-Sen University, Kaohsiung 804, Taiwan (China); Yeh, Bo-Liang [Advanced Display Technology Research Center, AU Optronics, No. 1, Li-Hsin Rd. 2, Hsinchu Science Park, Hsinchu 30078, Taiwan (China)

2014-03-31T23:59:59.000Z

358

Optimization Online - Level methods uniformly optimal for composite ...  

E-Print Network (OSTI)

Apr 19, 2011 ... Level methods uniformly optimal for composite and structured nonsmooth convex optimization. Guanghui Lan (glan ***at*** ise.ufl.edu).

Guanghui Lan

2011-04-19T23:59:59.000Z

359

Optimization Online - Global Optimization Toolbox for Maple: An ...  

E-Print Network (OSTI)

Feb 21, 2005 ... Give us feedback · Optimization Journals, Sites, Societies. Optimization Online is supported by the Mathematical Programming Society and by

Janos D. Pinter

2005-02-21T23:59:59.000Z

360

E85 Optimized Engine through Boosting, Spray Optimized GDi, VCR...  

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

GDi, VCR and Variable Valvetrain E85 Optimized Engine through Boosting, Spray Optimized GDi, VCR and Variable Valvetrain 2009 DOE Hydrogen Program and Vehicle Technologies Program...

Note: This page contains sample records for the topic "optimal gap width" 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

The 6/94 gap in health impact assessment  

SciTech Connect

Health impact assessment (HIA), a methodology that aims to facilitate the mitigation of negative and enhancement of positive health effects due to projects, programmes and policies, has been developed over the past 20-30 years. There is an underlying assumption that HIA has become a full fledged critical piece of the impact assessment process with a stature equal to both environmental and social impact assessments. This assumption needs to be supported by evidence however. Within the context of projects in developing country settings, HIA is simply a slogan without a clearly articulated and relevant methodology, offered by academia and having little or no salience in the decision-making process regarding impacts. This harsh assertion is supported by posing a simple question: 'Where in the world have HIAs been carried out?' To answer this question, we systematically searched the peer-reviewed literature and online HIA-specific databases. We identified 237 HIA-related publications, but only 6% of these publications had a focus on the developing world. What emerges is, therefore, a huge disparity, which we coin the 6/94 gap in HIA, even worse than the widely known 10/90 gap in health research (10% of health research funding is utilized for diseases causing 90% of the global burden of disease). Implications of this 6/94 gap in HIA are discussed with pointed emphasis on extractive industries (oil/gas and mining) and water resources development. We conclude that there is a pressing need to institutionalize HIA in the developing world, as a consequence of current predictions of major extractive industry and water resources development, with China's investments in these sectors across Africa being particularly salient.

Erlanger, Tobias E. [Department of Public Health and Epidemiology, Swiss Tropical Institute, CH-4002 Basel (Switzerland)], E-mail: tobias.erlanger@unibas.ch; Krieger, Gary R. [NewFields, LLC, Denver, CO 80202 (United States)], E-mail: gkrieger@newfields.com; Singer, Burton H. [Office of Population Research, Princeton University, Princeton, NJ 08544 (United States)], E-mail: singer@princeton.edu; Utzinger, Juerg [Department of Public Health and Epidemiology, Swiss Tropical Institute, CH-4002 Basel (Switzerland)], E-mail: juerg.utzinger@unibas.ch

2008-05-15T23:59:59.000Z

362

Rapidity gap signals in Higgs-boson production at the SSC  

Science Journals Connector (OSTI)

We examine the structure of the underlying event in neutral Higgs-boson production at the Superconducting Super Collider (SSC). Gaps, regions of rapidity containing no soft particle production, can provide a clean signature for W boson fusion to the heavy Higgs boson. We first examine the physical basis of gap production and estimate the survival probability of gaps in the minijet model. Then, using pythia, and herwig, we compare gap events to W pair production from top quark decay and qq¯ fusion. We find that, if experimental problems can be overcome, gaps should provide a small, but clean, signal for heavy Higgs-boson production at the SSC.

R. S. Fletcher and T. Stelzer

1993-12-01T23:59:59.000Z

363

Lattice Boltzmann model for photonic band gap materials  

Science Journals Connector (OSTI)

An efficient technique for computing photonic band structure and defect modes is proposed based on the lattice Boltzmann model. Physically, it is a scheme based on the kinetics of the virtual microscopic process, rather than a solution of the macroscopic Maxwell equations. The method has significant advantages of being naturally suited for massively parallel machine, as well as speed and convenience, providing another methodology for photonic band gap materials and, also, for general electromagnetic scattering problems in open region when incorporated with the perfectly matched layer technique.

Zhifang Lin; Haiping Fang; Jianjun Xu; Jian Zi; Xiangdong Zhang

2003-02-07T23:59:59.000Z

364

Gap-dependent transitions of atmospheric microplasma in open air  

SciTech Connect

We report on the gap dependence of the planar atmospheric microplasma in air. We investigate the transitions of the dielectric barrier discharge in open air, including the random walk filaments (plasma columns), localized filaments, stochastic filaments, and diffuse discharge. A star-shaped filamentary discharge pattern is observed after the formation of the localized filaments. The liquid drops found on the dielectric surface further become a confining pattern for star-shaped discharge. We also demonstrate the applications of the insulating pattern for the use of the plasma display in open air by the handwritten characters with UV adhesive.

Chu, Hong-Yu; Huang, Bo-Shiun [Department of Physics, National Chung Cheng University, ChiaYi 62102, Taiwan (China)

2011-04-15T23:59:59.000Z

365

Random-Gap Model for Graphene and Graphene Bilayers  

Science Journals Connector (OSTI)

The effect of a randomly fluctuating gap, created by a random staggered potential, is studied in a monolayer and a bilayer of graphene. The density of states, the one-particle scattering rate, and the transport properties (diffusion coefficient and conductivity) are calculated at the neutrality point. All of these quantities vanish at a critical value of the average staggered potential, signaling a continuous transition to an insulating behavior. Transport quantities are directly linked to the one-particle scattering rate. Although the behavior is qualitatively the same in mono- and bilayers, the effect of disorder is much stronger in the latter.

K. Ziegler

2009-03-24T23:59:59.000Z

366

Direct control of air gap flux in permanent magnet machines  

DOE Patents (OSTI)

A method and apparatus for field weakening in PM machines uses field weakening coils (35, 44, 45, 71, 72) to produce flux in one or more stators (34, 49, 63, 64), including a flux which counters flux normally produced in air gaps between the stator(s) (34, 49, 63, 64) and the rotor (20, 21, 41, 61) which carries the PM poles. Several modes of operation are introduced depending on the magnitude and polarity of current in the field weakening coils (35, 44, 45, 71, 72). The invention is particularly useful for, but not limited to, the electric vehicle drives and PM generators.

Hsu, John S. (Oak Ridge, TN)

2000-01-01T23:59:59.000Z

367

Origin of the optical gap in half-doped manganites  

Science Journals Connector (OSTI)

We have analyzed the coexisting charge and orbital ordering in half-doped manganites using a model which includes Coulomb and Jahn-Teller orbital polarization interactions. Most surprisingly, the gap in the optical conductivity is reduced by both on-site and intersite Coulomb interactions, but increases and explains the experimental results when the Jahn-Teller terms with orbital polarization are considered. The origin of this behavior is explained within a molecular model which arises in the limit of extreme topological frustration, when single electrons are confined to molecular units consisting of three orbitals.

Mario Cuoco; Canio Noce; Andrzej M. Ole?

2002-09-25T23:59:59.000Z

368

Fermi velocity renormalization and dynamical gap generation in graphene  

E-Print Network (OSTI)

We study the renormalization of the Fermi velocity by the long-range Coulomb interactions between the charge carriers in the Dirac-cone approximation for the effective low-energy description of the electronic excitations in graphene at half filling. Solving the coupled system of Dyson-Schwinger equations for the dressing functions in the corresponding fermion propagator with various approximations for the particle-hole polarization we observe that Fermi velocity renormalization effects generally lead to a considerable increase of the critical coupling for dynamical gap generation and charge-density wave formation at the semimetal-insulator transition.

C. Popovici; C. S. Fischer; L. von Smekal

2015-01-12T23:59:59.000Z

369

Low-pressure spark gap triggered by an ion diode  

DOE Patents (OSTI)

Spark gap apparatus for use as an electric switch operating at high voltage, high current and high repetition rate. Mounted inside a housing are an anode, cathode and ion plate. An ionizable fluid is pumped through the chamber of the housing. A pulse of current to the ion plate causes ions to be emitted by the ion plate, which ions move into and ionize the fluid. Electric current supplied to the anode discharges through the ionized fluid and flows to the cathode. Current stops flowing when the current source has been drained. The ionized fluid recombines into its initial dielectric ionizable state. The switch is now open and ready for another cycle.

Prono, D.S.

1982-08-31T23:59:59.000Z

370

Nonlinear Photon-Assisted Tunneling Transport in Optical Gap Antennas  

Science Journals Connector (OSTI)

(16, 17) For instance, incoming photons can exchange energy with tunneling charges modifying thus the conductance of the barrier(18, 19) and strong-field effects were recently reported. ... (32) The height ? of the potential barriers can be directly deduced from these two minima. ... Two lock-in amplifiers referenced at Fmod and 2Fmod output a signal proportional to the differential conductance I? = Vac(?Ib/?Vb) of the gap antenna and signal proportional to the nonlinearity of the conductance I? = 1/4Vac2(?2Ib/?Vb2), respectively. ...

Arnaud Stolz; Johann Berthelot; Marie-Maxime Mennemanteuil; Gérard Colas des Francs; Laurent Markey; Vincent Meunier; Alexandre Bouhelier

2014-04-03T23:59:59.000Z

371

NEWTON'S METHOD FOR MULTIOBJECTIVE OPTIMIZATION ...  

E-Print Network (OSTI)

truss optimization [8, 29, 40], design [27, 20, 38], space exploration [34, 41]), statis- tics [5], management ... Moreover, the corresponding optimization process is usually aug- ...... of optimal ressource allocation in job-shop production. European ...

372

Query Optimization Techniques Class Hierarchies  

E-Print Network (OSTI)

Query Optimization Techniques Exploiting Class Hierarchies Sophie Cluet 1 Guido Moerkotte 2 1 INRIA Since the introduction of object base management systems (OBMS), many query optimization techniques tailored for object query languages have been proposed. They adapt known optimization techniques

Mannheim, Universität

373

A Simple But Effective Canonical Dual Theory Unified Algorithm for Global Optimization  

E-Print Network (OSTI)

Numerical global optimization methods are often very time consuming and could not be applied for high-dimensional nonconvex/nonsmooth optimization problems. Due to the nonconvexity/nonsmoothness, directly solving the primal problems sometimes is very difficult. This paper presents a very simple but very effective canonical duality theory (CDT) unified global optimization algorithm. This algorithm has convergence is proved in this paper. More important, for this CDT-unified algorithm, numerous numerical computational results show that it is very powerful not only for solving low-dimensional but also for solving high-dimensional nonconvex/nonsmooth optimization problems, and the global optimal solutions can be easily and elegantly got with zero dual gap.

Jiapu Zhang

2011-05-11T23:59:59.000Z

374

Technical Standards, MACCS2, Gap Analysis - May 3, 2004 | Department of  

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

MACCS2, Gap Analysis - May 3, 2004 MACCS2, Gap Analysis - May 3, 2004 Technical Standards, MACCS2, Gap Analysis - May 3, 2004 May 3, 2004 Software Quality Assurance Improvement Plan: MACCS2 Gap Analysis The MACCS2 software, for radiological dispersion and consequence analysis, is one of the codes designated for the toolbox. To determine the actions needed to bring the MACCS2 code into compliance with the SQA qualification criteria, and develop an estimate of the resources required to perform the upgrade, the Implementation Plan has committed to sponsoring a code-specific gap analysis document. Technical Standards, MACCS2, Gap Analysis More Documents & Publications Technical Standards, Guidance on MACCS2 Computer Code - June 30, 2004 Technical Standards, MELCOR - Gap Analysis - May 3, 2004

375

Optimizing Control- A Survey  

E-Print Network (OSTI)

Ipulated Inpute teL point.. planl pIInm.t.erl --_ Figure 2: The Optimizing Control Scheme Figure 2 shows a fairly general arrangement of func tional units, the blocks, and the signal path connecting them. On the lowest level is the plant and the controller... performing the regulatory control of the plant. These two parts form the superblock "controlled plant". The optimizer is on the next higher level. It forms together with the "con trolled plant" the superblock "optimized plant" which is again manipulated...

Preisig, H. A.

376

Optimal Quantum Pumps  

E-Print Network (OSTI)

We study adiabatic quantum pumps on time scales that are short relative to the cycle of the pump. In this regime the pump is characterized by the matrix of energy shift which we introduce as the dual to Wigner's time delay. The energy shift determines the charge transport, the dissipation, the noise and the entropy production. We prove a general lower bound on dissipation in a quantum channel and define optimal pumps as those that saturate the bound. We give a geometric characterization of optimal pumps and show that they are noiseless and transport integral charge in a cycle. Finally we discuss an example of an optimal pump related to the Hall effect.

J. E. Avron; A. Elgart; G. M. Graf; L. Sadun

2001-07-12T23:59:59.000Z

377

Thermophotovoltaic Array Optimization  

SciTech Connect

A systematic approach to thermophotovoltaic (TPV) array design and fabrication was used to optimize the performance of a 192-cell TPV array. The systematic approach began with cell selection criteria that ranked cells and then matched cell characteristics to maximize power output. Following cell selection, optimization continued with an array packaging design and fabrication techniques that introduced negligible electrical interconnect resistance and minimal parasitic losses while maintaining original cell electrical performance. This paper describes the cell selection and packaging aspects of array optimization as applied to fabrication of a 192-cell array.

SBurger; E Brown; K Rahner; L Danielson; J Openlander; J Vell; D Siganporia

2004-07-29T23:59:59.000Z

378

Optimization Online Digest -- January 2005  

E-Print Network (OSTI)

Alexander Shapiro, Huifu Xu. Convex and Nonsmooth Optimization On the Minimum ... C. Jansson, C. Keil. Nonlinear Optimization A generating set search ...

379

Section 3.4: Optimization  

E-Print Network (OSTI)

Apr 2, 2014 ... knowledge to solve certain optimization problems. Optimization problems arise in almost every discipline. They are one of the key applications ...

2014-04-04T23:59:59.000Z

380

Optimization Online Digest -- May 2014  

E-Print Network (OSTI)

Global Optimization An Optimization Approach to the Design of Multi-Size Heliostat fields. E. Carrizosa, C. Domínguez-Bravo, E. Fernández-Cara, M. Quero

Note: This page contains sample records for the topic "optimal gap width" 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

Optimization Online Digest -- September 2014  

E-Print Network (OSTI)

Alvaro Lorca, Andy Sun, Eugene Litvinov, Tongxin Zheng Optimality ... RBFOpt: an open-source library for black-box optimization with costly function evaluations

382

Bridge the Gap 2014 --Guidance for Participants Requiring Level Access This level-access route is meant to accommodate Bridge the Gap participants using  

E-Print Network (OSTI)

or there is an alternative route in to the College theough the Golden Gate. There will be a steward on hand to assist. 12Bridge the Gap 2014 -- Guidance for Participants Requiring Level Access This level-access route is meant to accommodate Bridge the Gap participants using wheelchairs, mobility scooters and pushchairs

Travis, Adrian

383

Optimization of Stationary Concentrators  

Science Journals Connector (OSTI)

In this chapter, the main characteristics of stationary nonimaging solar concentrators are optimized in respect of the latitude of their installation and the direct fraction of solar radiation incident on the ...

Dr. Ralf Leutz; Dr. Akio Suzuki

2001-01-01T23:59:59.000Z

384

2008 - Optimization Online  

E-Print Network (OSTI)

Building separating concentric balls to solve a multi-instance classification problem ... block coordinate-descent decomposition in large-scale integrated refinery- ... of the optimal solutions to Huff-type competitive location and design problems

385

Online optimization problems  

E-Print Network (OSTI)

In this thesis, we study online optimization problems in routing and allocation applications. Online problems are problems where information is revealed incrementally, and decisions must be made before all information is ...

Lu, Xin, Ph. D. Massachusetts Institute of Technology. Operations Research Center

2013-01-01T23:59:59.000Z

386

Polyethylene fiber drawing optimization  

E-Print Network (OSTI)

Polymer fiber drawing creates fibers with enhanced thermal conductivity and strength compared to bulk polymer because drawing aligns the molecular chains. I optimize the polymer fiber drawing method in order to achieve ...

Chiloyan, Vazrik

2011-01-01T23:59:59.000Z

387

Organic solar cell optimizations  

Science Journals Connector (OSTI)

This paper presents recent experimental and theoretical approaches for optimizing organic solar cell efficiencies in both space and energy/time...D/A...) blend film, a corresponding –DBAB- block copolymer film ex...

S. Sun; Z. Fan; Y. Wang; J. Haliburton

2005-03-01T23:59:59.000Z

388

4269.ps - Optimization Online  

E-Print Network (OSTI)

lem concerning the optimal design of an industrial electric motor. This allows to show that. the method ...... phase resistance at 90? [?]. ? 0.31. g8. torque at base

389

Service based logistics optimization  

E-Print Network (OSTI)

This thesis explores the use of a service based logistics optimization (SBLO) methodology for an inbound reverse logistics network. Currently, Quest Diagnostics solves the vehicle routing problem with time windows (VRPTW) ...

Price, Gregory D., Jr

2014-01-01T23:59:59.000Z

390

Energy Harvesting Optimization  

E-Print Network (OSTI)

Energy Harvesting Optimization Power Systems Analysis Final Project into energy harvesting techniques about two decade ago as a valuable way to satisfy those new demands. Energy harvesting derives energy from the ambient environment

Lavaei, Javad

391

Nuclear energy density optimization  

Science Journals Connector (OSTI)

We carry out state-of-the-art optimization of a nuclear energy density of Skyrme type in the framework of the Hartree-Fock-Bogoliubov theory. The particle-hole and particle-particle channels are optimized simultaneously, and the experimental data set includes both spherical and deformed nuclei. The new model-based, derivative-free optimization algorithm used in this work has been found to be significantly better than standard optimization methods in terms of reliability, speed, accuracy, and precision. The resulting parameter set unedf0 results in good agreement with experimental masses, radii, and deformations and seems to be free of finite-size instabilities. An estimate of the reliability of the obtained parameterization is given, based on standard statistical methods. We discuss new physics insights offered by the advanced covariance analysis.

M. Kortelainen; T. Lesinski; J. Moré; W. Nazarewicz; J. Sarich; N. Schunck; M. V. Stoitsov; S. Wild

2010-08-13T23:59:59.000Z

392

Cost Optimal Energy Performance  

Science Journals Connector (OSTI)

EPBD recast requires Member States (MS) to ensure that minimum energy performance requirements of buildings are set with a view to achieving cost optimal levels using a comparative methodology framework...1]. Cost

Jarek Kurnitski

2013-01-01T23:59:59.000Z

393

Optimization in Networks  

E-Print Network (OSTI)

The recent surge in the network modeling of complex systems has set the stage for a new era in the study of fundamental and applied aspects of optimization in collective behavior. This Focus Issue presents an extended view of the state of the art in this field and includes articles from a large variety of domains where optimization manifests itself, including physical, biological, social, and technological networked systems.

Adilson E. Motter; Zoltan Toroczkai

2007-07-07T23:59:59.000Z

394

Convex Analysis and Optimization, D. P. Bertsekas! CONVEX OPTIMIZATION  

E-Print Network (OSTI)

1! Convex Analysis and Optimization, D. P. Bertsekas! CONVEX OPTIMIZATION: A SELECTIVE OVERVIEW Dimitri Bertsekas! M.I.T.! Taiwan! May 2010! #12;2! Convex Analysis and Optimization, D. P. Bertsekas! OUTLINE! · Convexity issues in optimization! · Common geometrical framework for duality and minimax

Bertsekas, Dimitri

395

The evolution of the width of X-ray flares with time in Gamma-ray bursts  

SciTech Connect

We present one of the most intriguing results obtained with an updated catalog of 113 early time (i.e. t{sub pk} < or approx. 1000 s) and 36 late time (i.e. t{sub pk} > or approx. 1000 s) X-ray flares detected by Swift in the afterglows of Gamma-Ray Bursts (GRB): the evolution of the width of the flares with time. This result, together with other properties investigated on early and late time flares and bright flares, provides a clear observational property that every model aiming at explaining the GRB emission has to face.

Bernardini, Maria Grazia [INAF-Osservatorio Astronomico di Brera, via Bianchi 46, I-23807 Merate (Italy); ICRANet, P.le della Repubblica 10, I-65100 Pescara (Italy); Chincarini, Guido; Margutti, Raffaella [INAF-Osservatorio Astronomico di Brera, via Bianchi 46, I-23807 Merate (Italy); University of Milano Bicocca, Physics Dept., P.zza della Scienza 3, I-20126 Milano (Italy)

2010-10-15T23:59:59.000Z

396

Combined D0 measurements constraining the CP-violating phase and width difference in the B(0)(s) system  

E-Print Network (OSTI)

Combined D0 measurements constraining the CP-violating phase and width difference in the B0s system V. M. Abazov,35 B. Abbott,75 M. Abolins,65 B. S. Acharya,28 M. Adams,51 T. Adams,49 E. Aguilo,5 S. H. Ahn,30 M. Ahsan,59 G. D. Alexeev,35 G. Alkhazov... and of the CP-violating mixing phase determined from the time-dependent angular distribu- tions in the B0s ! J= #1; decays along with the charge asymmetry in semileptonic decays also measured with the D0 detector. With the additional constraint from the world...

Baringer, Philip S.; Bean, Alice; Hensel, Carsten; Moulik, Tania; Wilson, Graham Wallace

2007-09-17T23:59:59.000Z

397

Method of Controlling Corona Effects and Breakdown Voltage of Small Air Gaps Stressed by Impulse Voltages  

E-Print Network (OSTI)

This paper investigates the influence of a resistor on the dielectric behavior of an air gap. The resistor is connected in series with the air gap and the latter is stressed by impulse voltage. Air gap arrangements of different geometry with either the rod or the plate grounded are stressed with impulse voltages of both positive and negative polarity. The resistor is connected in series with the air gap in the return circuit connecting the gap with the impulse generator. The method followed involves the investigation of the graphs of the charging time concerning the air gaps capacitances, in connection to the value of the resistor, the geometry of the gap, the effect of grounding and the polarity effect. It is determined that the charging time of the air gap increases, as the value of the resistor increases. It is also determined that the peak voltage value of the fully charged air gap decreases as the value of the resistor increases. The results of the mathematical and simulation analysis are compared with the results of the oscillograms taken from experimental work. In addition and consequently to the above results it is concluded from the experimental work that the in series connection of the resistor in the circuit has significant influence on corona pulses (partial discharges) occurring in the gap and on the breakdown voltage of the gap. A new method of controlling the corona effects and consequently the breakdown voltage of small air gaps stressed by impulse voltage of short duration in connection to the ground effect and the polarity effect has arisen. Furthermore through mathematical analysis of the charging graphs obtained from simulation and experimental oscillograms there was a calculation of the values of the capacitance of the air gaps in relation to their geometry and the results were compared to the values calculated with mathematical analysis.

Athanasios Maglaras; Trifon Kousiouris; Frangiskos Topalis; Dimitrios Katsaros; Leandros A. Maglaras; Konstantina Giannakopoulou

2014-10-15T23:59:59.000Z

398

Optimal and Non-optimal Choice 44 Optimal and Non-optimal Choice 45 Optimal and Non-optimal Behavior Across Species  

E-Print Network (OSTI)

-optimally. The first area is the sunk-cost effect in which participants persist in a losing course of action, ignoring-reduction theory; observing responses; sunk-cost effect; base-rate neglect. Optimal and Non-optimal Behavior Across

Cook, Robert

399

Convex Optimization Course Welcome Pack  

E-Print Network (OSTI)

1 NATCOR Convex Optimization Course 23rd ­ 27th June 2014 Welcome Pack This pack contains. ABSTRACT Convex optimization is the fundamental process of optimal decision-making. Although mathematically restrictive, many practical problems may be modelled directly as convex optimization problems. Convex

Hall, Julian

400

Interferometric Detection of Planets/Gaps in Protoplanetary Disks  

E-Print Network (OSTI)

We investigate the possibility to find evidence for planets in circumstellar disks by infrared and submillimeter interferometry. Hydrodynamical simulations of a circumstellar disk around a solar-type star with an embedded planet of 1 Jupiter mass are presented. On the basis of 3D radiative transfer simulations, images of this system are calculated. These intensity maps provide the basis for the simulation of the interferometers VLTI (equipped with the mid-infrared instrument MIDI) and ALMA. While ALMA will provide the necessary basis for a direct gap and therefore indirect planet detection, MIDI/VLTI will provide the possibility to distinguish between disks with or without accretion on the central star on the basis of visibility measurements.

S. Wolf; F. Gueth; Th. Henning; W. Kley

2002-08-26T23:59:59.000Z

Note: This page contains sample records for the topic "optimal gap width" 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

Bridging the Efficiency Gap: Commercial Packaged Rooftop Air Conditioners  

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

Bridging Bridging the Efficiency Gap: Commercial Packaged Rooftop Air Conditioners John Shugars, Consultant Philip Coleman, Lawrence BerkeleyNational Laboratory ChristopherPayne, Lawrence Berkeley National Laboratory Laura Van Wie McGrory, Lawrence Berkeley National Laboratory ABSTRACT The energy efficiency ofmany products has increased markedly over the past decade. A conspicuous exception to this trend is commercial packaged rooftop air conditioners, which have experiencedlittle to no efficiency improvement since 1992 when the Energy Policy Act of 1992 imposed federal minimum standards. Packaged rooftop units have been estimated to use on the order of76 billion kWh annually in the US, at a cost ofroughly $5.6 billion. Sales of these units are growing, and the majority of units sold have energy efficiency ratios (EERs) at orjust above the current national minimum efficiency

402

Review of Used Nuclear Fuel Storage and Transportation Technical Gap  

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

Analyses Analyses Review of Used Nuclear Fuel Storage and Transportation Technical Gap Analyses The U.S. Department of Energy Office of Nuclear Energy (DOE-NE), Office of Fuel Cycle Technology, has established the Used Fuel Disposition Campaign (UFDC) to conduct the research and development activities related to storage, transportation, and disposal of used nuclear fuel and high-level radioactive waste. The mission of the UFDC is to identify alternatives and conduct scientific research and technology development to enable storage, transportation, and disposal of used nuclear fuel (UNF) and wastes generated by existing and future nuclear fuel cycles. The Storage and Transportation activities within the UFDC are being developed to address issues regarding the extended storage of UNF and its subsequent

403

Designing Networks: A Mixed-Integer Linear Optimization Approach  

E-Print Network (OSTI)

Designing networks with specified collective properties is useful in a variety of application areas, enabling the study of how given properties affect the behavior of network models, the downscaling of empirical networks to workable sizes, and the analysis of network evolution. Despite the importance of the task, there currently exists a gap in our ability to systematically generate networks that adhere to theoretical guarantees for the given property specifications. In this paper, we propose the use of Mixed-Integer Linear Optimization modeling and solution methodologies to address this Network Generation Problem. We present a number of useful modeling techniques and apply them to mathematically express and constrain network properties in the context of an optimization formulation. We then develop complete formulations for the generation of networks that attain specified levels of connectivity, spread, assortativity and robustness, and we illustrate these via a number of computational case studies.

Gounaris, Chrysanthos E; Kevrekidis, Ioannis G; Floudas, Christodoulos A

2015-01-01T23:59:59.000Z

404

Constraints on the Higgs boson width from off-shell production and decay to Z-boson pairs  

Science Journals Connector (OSTI)

Abstract Constraints are presented on the total width of the recently discovered Higgs boson, ? H , using its relative on-shell and off-shell production and decay rates to a pair of Z bosons, where one Z boson decays to an electron or muon pair, and the other to an electron, muon, or neutrino pair. The analysis is based on the data collected by the CMS experiment at the LHC in 2011 and 2012, corresponding to integrated luminosities of 5.1   fb ? 1 at a center-of-mass energy s = 7   TeV and 19.7   fb ? 1 at s = 8   TeV . A simultaneous maximum likelihood fit to the measured kinematic distributions near the resonance peak and above the Z-boson pair production threshold leads to an upper limit on the Higgs boson width of ? H < 22   MeV at a 95% confidence level, which is 5.4 times the expected value in the standard model at the measured mass of m H = 125.6   GeV .

2014-01-01T23:59:59.000Z

405

Characterization of optimal entanglement witnesses  

Science Journals Connector (OSTI)

In this paper, we present a characterization of optimal entanglement witnesses in terms of positive maps and then provide a general method of checking optimality of entanglement witnesses. Applying it, we obtain indecomposable optimal witnesses that have no spanning property. These also provide examples that support a recent conjecture saying that the so-called structural physical approximations to optimal positive maps (optimal entanglement witnesses) give entanglement breaking maps (separable states).

Xiaofei Qi and Jinchuan Hou

2012-02-27T23:59:59.000Z

406

Design of Optimal Regulators  

E-Print Network (OSTI)

Current research suggests the use of a liner quadratic performance index for optimal control of regulators in various applications. Some examples include correcting the trajectory of rocket and air vehicles, vibration suppression of flexible structures, and airplane stability. In all these cases, the focus is in suppressing/decreasing system deviations rapidly. However, if one compares the Linear Quadratic Regulator (LQR) solution with optimal solutions (minimum time), it is seen that the LQR solution is less than optimal in some cases indeed (3-6) times that obtained using a minimum time solution. Moreover, the LQR solution is sometimes unacceptable in practice due to the fact that values of control extend beyond admissible limits and thus the designer must choose coefficients in the linear quadratic form, which are unknown. The authors suggest methods which allow finding a quasi-optimal LQR solution with bounded control which is closed to the minimum time solution. They also remand the process of the minimum time decision. Keywords: Optimal regulator, minimum time controller, Linear Quadratic Regulator (LQR). -- This paper is declared a work of the U.S. Government and not subject to copyright protection in the USA. The manuscript is accepted as paper AIAA-2003-6638 by 2nd AIAA Unmanned Unlimited Systems, Technologies, and Operations-Aerospace, Land, and See Conference and Workshop - Exhibit, San Diego, California, USA, 15-18 Sep. 2003.

Alexander Bolonkin; Robert Sierakowski

2007-01-19T23:59:59.000Z

407

Influence of the multiple scattering of relativistic electrons on the line width of backward Parametric X-ray Radiation in the absence of photo absorption  

E-Print Network (OSTI)

The multiple scattering effect on the line width of backward Parametric X-ray Radiation (PXR) in the extremely Bragg geometry, produced by low energy relativistic electrons traversing a single crystal, is discussed. It is shown that there exist conditions, when the influence of photo absorption on the line width can be neglected, and the only multiple scattering process of relativistic electrons in crystal leads to the broadening of backward PXR lines. Based on the obtained theoretical results, the line width broadening of backward PXR, caused by the multiple scattering of 30 MeV and 50 MeV relativistic electrons in a Si crystal of varying thicknesses, is numerically obtained.

Tabrizi, Mehdi

2015-01-01T23:59:59.000Z

408

Temperature dependence of the gaps of high-temperature superconductors in the Fermi-arc region  

Science Journals Connector (OSTI)

It is shown how in a high-temperature superconductor, the length of the Fermi arc can be obtained from the doping dependence of the pseudogap and the superconducting gap. In the momentum region spanned by the Fermi arc, the pseudogap temperature dependence follows that of the superconducting gap. The close interconnection of the two gaps suggests that they are both an essential part of the high-temperature superconductivity.

S. Hüfner and F. Müller

2008-07-23T23:59:59.000Z

409

Optimization of dredge and variable displacement pumps  

Science Journals Connector (OSTI)

1. Centrifugal pumps with an adjustable outlet diameter and width of the impeller passage and discharge pipe imp...

P. R. Khlopenkov

1982-11-01T23:59:59.000Z

410

Hopper Performance and Optimization  

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

Optimization Optimization Performance and Optimization Compiler Comparisons Comparison of different compilers with different options on several benchmarks. Read More » Using OpenMP Effectively Performance implications and case studies of codes combining MPI and OpenMP Read More » Reordering MPI Ranks Reordering MPI ranks can result in improved application performance depending on the communication patterns of the application. Read More » Application Performance Variability on Hopper How an application is placed across Hopper's roughly 6300 compute nodes can affect its performance. See a study of application runtimes vs node placement. Read More » Hopper Performance Monitoring Benchmarking performance of scientific applications on Hopper Read More » Hopper:Improving I/O performance to GSCRATCH and PROJECT

411

Reverse Osmosis Optimization  

SciTech Connect

This technology evaluation was prepared by Pacific Northwest National Laboratory on behalf of the U.S. Department of Energy’s Federal Energy Management Program (FEMP). ¬The technology evaluation assesses techniques for optimizing reverse osmosis (RO) systems to increase RO system performance and water efficiency. This evaluation provides a general description of RO systems, the influence of RO systems on water use, and key areas where RO systems can be optimized to reduce water and energy consumption. The evaluation is intended to help facility managers at Federal sites understand the basic concepts of the RO process and system optimization options, enabling them to make informed decisions during the system design process for either new projects or recommissioning of existing equipment. This evaluation is focused on commercial-sized RO systems generally treating more than 80 gallons per hour.¬

McMordie Stoughton, Kate; Duan, Xiaoli; Wendel, Emily M.

2013-08-26T23:59:59.000Z

412

Lattice Boltzmann Simulation Optimization  

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

Boltzmann Boltzmann Simulation Optimization on Leading Multicore Platforms Selected as Best Paper in Application Track, IPDPS 2008, April 14-28, Miami, Florida, USA Samuel Williams † , Jonathan Carter , Leonid Oliker John Shalf , Katherine Yelick † CRD/NERSC, Lawrence Berkeley National Laboratory Berkeley, CA 94720 † CS Division, University of California at Berkeley, Berkeley, CA 94720 {SWWilliams, JTCarter, LOliker, JShalf, KAYelick}@lbl.gov Abstract We present an auto-tuning approach to optimize ap- plication performance on emerging multicore architec- tures. The methodology extends the idea of search- based performance optimizations, popular in linear al- gebra and FFT libraries, to application-specific com- putational kernels. Our work applies this strategy to a lattice Boltzmann application (LBMHD) that histor- ically has made poor use of scalar microprocessors

413

A Survey of Gaps, Obstacles, and Technical Challenges for Hypersonic Applications.  

E-Print Network (OSTI)

?? The object of this study is to canvas the literature for the purpose of identifying and compiling a list of Gaps, Obstacles, and Technological… (more)

Barber, Timothy Andrew

2012-01-01T23:59:59.000Z

414

When is a Gap Function Good for Error Bounds? 1 Introduction and ...  

E-Print Network (OSTI)

the gap function and its Fukushima type regularization for GVI and WGVI. ...... straight forward way and in fact in a more simpler fashion than that of [18] whose

2012-07-11T23:59:59.000Z

415

A database for the study of marine mammal behavior: Gap analysis, data standardization, and future directions  

E-Print Network (OSTI)

Gap Analysis, Data Standardization, and Future Directionsdata, and 3) lack of standardization in data re- porting. Awas the lack of standardization and/or presentation of

Shaffer, S A; Costa, Daniel P

2006-01-01T23:59:59.000Z

416

E-Print Network 3.0 - artificial canopy gaps Sample Search Results  

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

canopy gap (which may... -scope assesses the relative size of the largest ... Source: Forest Research Agency of the UK Forestry Commission Collection: Renewable Energy 26...

417

Fact #850: December 8, 2014 Automatic Transmissions have closed the Fuel Economy Gap with Manual Transmissions  

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

Historically, manual transmissions have delivered better fuel economy than automatic transmissions. However, improvements in the efficiency of automatic transmissions have closed that gap in recent...

418

Three-photon-absorption spectroscopy in an indirect-gap material: CdI2  

Science Journals Connector (OSTI)

The three-photon absorption (3PA) spectrum of an indirect-gap material (CdI2) has been measured at 10 K by monitoring the resulting self-trapped-exciton emission. The contribution of excitonic transitions has been evidenced for excitation energies near the indirect gap, while the contribution of allowed and forbidden indirect transitions has been shown for excitation energies far from the gap. The spectral behavior of the 3PA coefficient has been described by parametric formulas, which are analogous to the ones successfully applied for 3PA in direct-gap materials.

M. Lepore; R. Tommasi; I. M. Catalano

1993-03-15T23:59:59.000Z

419

Bridging the gaps in design methodologies by evolutionary optimization of the stability and proficiency of designed Kemp eliminase KE59  

Science Journals Connector (OSTI)

...design process involved protein free energy minimization. Because mutations are destabilizing...6827 . 7 Thorn SN Daniels RG Auditor MT Hilvert D ( 1995 ) Large rate accelerations...perform in calculating conformational energies of organic and biological molecules...

Olga Khersonsky; Gert Kiss; Daniela Röthlisberger; Orly Dym; Shira Albeck; Kendall N. Houk; David Baker; Dan S. Tawfik

2012-01-01T23:59:59.000Z

420

Diode-end-pumped double Nd:YLF slab laser with high energy, short pulse width, and diffraction-limited quality  

Science Journals Connector (OSTI)

We have developed a novel electro-optic Q-switched diode-end-pumped solid slab laser that combines high energy, short pulse width, high repetition rates, and...

Li, Daijun; Ma, Zhe; Haas, Rüdiger; Schell, Alexander; Zhu, Peng; Shi, Peng; Du, Keming

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "optimal gap width" 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

Linear and Convex Optimization  

E-Print Network (OSTI)

, Assignments, Optional Projects: https://t-square.gatech.edu/portal/site/gtc-6089-dba2-5a47-b722-565937d0333d for submis- sions 04/01/2014 Software environment: MATLAB and CVX CVX is an excellent user-friendly optimization solver working under MATLAB, free download at http://cvxr.com/cvx/ E. Optional bonus modeling

Nemirovski, Arkadi

422

Multiperiod Refinery Planning Optimization  

E-Print Network (OSTI)

;7 Example 1: 5 crudes, 4 weeks Produce fuel gas, regular gasoline, premium gasoline, distillate, fuel oil seconds (94% NLP, 6% MIP) #12;8 Example 2: 8 crudes, 6 weeks Produce fuel gas, regular gasoline, premium gasoline, distillate, fuel oil and treated residu Optimal solution ($1000's) Profit 3641.3 Sales 33790

Grossmann, Ignacio E.

423

View - Optimization Online  

E-Print Network (OSTI)

MDP as a large stochastic program; Section 7 describes sampling-based optimization procedures for ...... This estimate is the sample average of 1000 simulation runs of the policy in question. ... unit peaks in the middle of the booking process. .... Working paper, School of Industrial and Systems Engineering, Georgia.

2004-01-27T23:59:59.000Z

424

Genetic-Algorithm Discovery of a Direct-Gap and Optically Allowed Superstructure from Indirect-Gap Si and Ge Semiconductors  

SciTech Connect

Combining two indirect-gap materials - with different electronic and optical gaps - to create a direct gap material represents an ongoing theoretical challenge with potentially rewarding practical implications, such as optoelectronics integration on a single wafer. We provide an unexpected solution to this classic problem, by spatially melding two indirect-gap materials (Si and Ge) into one strongly dipole-allowed direct-gap material. We leverage a combination of genetic algorithms with a pseudopotential Hamiltonian to search through the astronomic number of variants of Si{sub n}/Ge{sub m}/.../Si{sub p}/Ge{sub q} superstructures grown on (001) Si{sub 1-x}Ge{sub x}. The search reveals a robust configurational motif - SiGe{sub 2}Si{sub 2}Ge{sub 2}SiGe{sub n} on (001) Si{sub x}Ge{sub 1-x} substrate (x {le} 0.4) presenting a direct and dipole-allowed gap resulting from an enhanced {Gamma}-X coupling at the band edges.

d'Avezac, M.; Luo, J. W.; Chanier, T.; Zunger, A.

2012-01-13T23:59:59.000Z

425

Optimal Structural Nested Models for Optimal Sequential Decisions  

Science Journals Connector (OSTI)

I describe two new methods for estimating the optimal treatment regime (equivalently, protocol, plan or strategy) from very high dimesional observational and experimental data: (i) g-estimation of an optimal doub...

James M. Robins

2004-01-01T23:59:59.000Z

426

THE VELOCITY WIDTH FUNCTION OF GALAXIES FROM THE 40% ALFALFA SURVEY: SHEDDING LIGHT ON THE COLD DARK MATTER OVERABUNDANCE PROBLEM  

SciTech Connect

The ongoing Arecibo Legacy Fast ALFA (ALFALFA) survey is a wide-area, extragalactic HI-line survey conducted at the Arecibo Observatory. Sources have so far been extracted over {approx}3000 deg{sup 2} of sky (40% of its final area), resulting in the largest HI-selected sample to date. We measure the space density of HI-bearing galaxies as a function of their observed velocity width (uncorrected for inclination) down to w = 20 km s{sup -1}, a factor of two lower than the previous generation HI Parkes All-Sky Survey. We confirm previous results that indicate a substantial discrepancy between the observational distribution and the theoretical one expected in a cold dark matter (CDM) universe, at low widths. In particular, a comparison with synthetic galaxy samples populating state-of-the-art CDM simulations imply a factor of {approx}8 difference in the abundance of galaxies with w = 50 km s{sup -1} (increasing to a factor of {approx}100 when extrapolated to the ALFALFA limit of w = 20 km s{sup -1}). We furthermore identify possible solutions, including a keV warm dark matter scenario and the fact that HI disks in low-mass galaxies are usually not extended enough to probe the full amplitude of the galactic rotation curve. In this latter case, we can statistically infer the relationship between the measured HI rotational velocity of a galaxy and the mass of its host CDM halo. Observational verification of the presented relationship at low velocities would provide an important test of the validity of the established dark matter model.

Papastergis, Emmanouil; Martin, Ann M.; Giovanelli, Riccardo; Haynes, Martha P., E-mail: papastergis@astro.cornell.edu, E-mail: amartin@astro.cornell.edu, E-mail: riccardo@astro.cornell.edu, E-mail: haynes@astro.cornell.edu [Center for Radiophysics and Space Research, Space Sciences Building, Cornell University, Ithaca, NY 14853 (United States)

2011-09-20T23:59:59.000Z

427

Design and characterization of an undulator beamline optimized for small-angle coherent X-ray scattering at the Advanced Photon Source  

Science Journals Connector (OSTI)

The design of an undulator beamline at the Advanced Photon Source optimized for performing coherent small-angle X-ray scattering is described. The beamline has been characterized by measuring and analysing static speckle patterns from isotropically disordered samples. The measured speckle widths and amplitudes are compared with a theory described herein and found to be in good agreement with its predictions.

Sandy, A.R.

1999-11-01T23:59:59.000Z

428

Nonlinear Conic Optimization --why and how--  

E-Print Network (OSTI)

Nonlinear Conic Optimization --why and how-- Michal Kocvara School of Mathematics, The University Optimization 1 / 38 #12;Conic optimization "generalized" mathematical optimization problem min f(x) subject optimization, LCO convex convex conic optimization, CCO non-convex non-convex conic optimization, NCO Michal

Sidorov, Nikita

429

Shell width Three bumps  

E-Print Network (OSTI)

be mottled dark brown to dark green, with small yellow patches. The bottom may be orange or red during citizen monitoring & invasive species in Alaska on the web: www.cnipm.org (plants) or www

430

NETL: News Release - Data Acquisition Processor Fills Gap for Extreme  

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

9, 2010 9, 2010 Data Acquisition Processor Fills Gap for Extreme Down-hole Conditions Honeywell Develops Unique Reprogrammable High Temperature Device Morgantown, WV - Honeywell International, Inc. has developed a Reconfigurable Processor for Data Acquisition (RPDA) - a reprogrammable, multi-functional device that can operate at temperatures up to 250oC (482oF). The system is housed in a rugged package suitable for deep down-hole oil and natural gas logging and measurement-while-drilling (MWD) operations, and permanent wellbore installation applications. The project was funded through a cooperative agreement with the National Energy Technology Laboratory (NETL) under the Office of Fossil Energy's Oil and Natural Gas Program. Deep wells are generally defined as having a true vertical depth (TVD) greater than 15,000 feet, while ultra-deep wells are deeper than 25,000 feet TVD. Potential recoverable natural gas and oil resources from deep formations are significant, and deep wells tend to produce at much higher daily rates than conventional shallower wells.

431

Analyzing the Performance of a Multiobjective GA-P Algorithm for Learning Fuzzy Queries in  

E-Print Network (OSTI)

Analyzing the Performance of a Multiobjective GA-P Algorithm for Learning Fuzzy Queries in a Machine Learning Environment Oscar Cord´on1 , Enrique Herrera-Viedma1 , Mar´ia Luque1 , F´elix de Moya2- tionary algorithms (EAs) [1], such as genetic algorithm-programming (GA-P) [11] or simulated annealing

Fernandez, Thomas

432

InAlAs EPITAXIAL GROWTH FOR WIDE BAND GAP SOLAR CELLS Marina S. Leite  

E-Print Network (OSTI)

InAlAs EPITAXIAL GROWTH FOR WIDE BAND GAP SOLAR CELLS Marina S. Leite 1 , Robyn L. Woo 2 , William vapor phase epitaxy and wide band gap solar cell fabrication. X-ray diffraction and transmissionAlAs solar cells lattice-matched to InP were grown and electrically characterized under AM 1.5 global 1-sun

Atwater, Harry

433

Light trapping design for low band-gap polymer solar cells  

E-Print Network (OSTI)

Light trapping design for low band-gap polymer solar cells Stephen Foster1,* and Sajeev John1,2 1 demonstrate numerically a 2-D nanostructured design for light trapping in a low band-gap polymer solar cell, "Light harvesting improvement of organic solar cells with self- enhanced active layer designs," Opt

John, Sajeev

434

Energy Band-Gap Engineering of Graphene Nanoribbons Melinda Y. Han,1  

E-Print Network (OSTI)

, New York, New York 10027, USA 2 Department of Physics, Columbia University, New York, New York 10027Energy Band-Gap Engineering of Graphene Nanoribbons Melinda Y. Han,1 Barbaros O¨ zyilmaz,2 Yuanbo an energy gap near the charge neutrality point. Individual graphene layers are contacted with metal

Kim, Philip

435

Collapse of integer Hall gaps in a double-quantum-well system  

Science Journals Connector (OSTI)

For coupled double-quantum-well systems in which tunneling is important, the symmetric to antisymmetric energy gap leads to a quantum Hall effect. In this Letter we show that interaction effects in strong magnetic fields can destroy this gap, and present a theory which predicts the occurrence or nonoccurrence of a quantum Hall effect.

A. H. MacDonald; P. M. Platzman; G. S. Boebinger

1990-08-06T23:59:59.000Z

436

MODELING PLANT COMPETITION WITH THE GAPS OBJECT-ORIENTED DYNAMIC SIMULATION MODEL  

E-Print Network (OSTI)

MODELING PLANT COMPETITION WITH THE GAPS OBJECT-ORIENTED DYNAMIC SIMULATION MODEL David G. Rossiter of Agronomy, Inc. #12;MODELING PLANT COMPETITION WITH THE GAPS OBJECT-ORIENTED DYNAMIC SIMULATION MODEL Abstract Modeling inter-species competition is a natural application for dynamic simulation models

Rossiter, D G "David"

437

Contents 1. Introduction - Optimization Online  

E-Print Network (OSTI)

Jun 9, 2010 ... Robust optimization is the methodology of handling optimization problems with uncertain data. ...... We also need material in set-valued analysis as presented in [9, Chapters 4 and ...... These diagrams illustrate Example 7.5.

2010-06-09T23:59:59.000Z

438

Free Material Optimization with Fundamental Eigenfrequency ...  

E-Print Network (OSTI)

The goal of this paper is to formulate and solve free material optimization ... Free material optimization (FMO) is a branch of structural optimization that gains in-.

2008-10-28T23:59:59.000Z

439

PCx: Optimization Problem Solver | Argonne National Laboratory  

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

PCx: Optimization Problem Solver PCx: Optimization Problem Solver PCx is a highly efficient code for solving linear programming optimization problems. In addition to being a useful...

440

Bridging the Gap-The Outcome of the Climate Conference in Copehagen and its  

Open Energy Info (EERE)

Bridging the Gap-The Outcome of the Climate Conference in Copehagen and its Bridging the Gap-The Outcome of the Climate Conference in Copehagen and its Implications for the Land Transport Sector Jump to: navigation, search Tool Summary Name: Bridging the Gap-The Outcome of the Climate Conference in Copehagen and its Implications for the Land Transport Sector Agency/Company /Organization: Bridging the Gap Sector: Energy, Land Focus Area: Transportation Topics: Policies/deployment programs Resource Type: Publications Website: www.transport2012.org/bridging/ressources/documents/1/556,Copenhagen_r References: Bridging the Gap-The Outcome of the Climate Conference in Copehagen and its Implications for the Land Transport Sector[1] "This paper provides a brief overview of the outcome of the UN conference and a discussion of the implications of decisions made there in respect to

Note: This page contains sample records for the topic "optimal gap width" 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 New Gap-Opening Mechanism in a Triple-Band Metal  

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

A New Gap-Opening Mechanism in a A New Gap-Opening Mechanism in a Triple-Band Metal A New Gap-Opening Mechanism in a Triple-Band Metal Print Wednesday, 23 February 2005 00:00 A "wire" of indium only one or a few atoms wide grown on a silicon surface comprises an ideal test laboratory for studying one-dimensional (1D) metals. A new example comes from a collaboration between researchers from Yonsei University in Korea, the ALS, and the University of Oregon, who have discovered that the phase transition from metal to insulator that occurs at low temperature in indium wires on the silicon (111) surface involves not only the expected shift in the electronic structure (band-gap opening) but also a band restructuring that gives rise to an energy gap in a second band. Three's a Crowd

442

Vacuum gaps with small tunnel currents at large electric field and its  

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

Vacuum gaps with small tunnel currents at large electric field and its Vacuum gaps with small tunnel currents at large electric field and its potential applications for energy storage, charge storage and power supplies. Friday, May 27, 2011 - 4:00pm SSRL Conference Room 137-226 Alfred Hubler, Department of Physics, University of Illinois, Urbana-Champaign We study tunnel currents and electric break down in vacuum gaps experimentally and theoretically. We find that electric field at break down in nano vacuum gaps is 3 order of magnitude larger than in macroscopic capacitors. Pointed electrodes increase the limiting field even further. Eigen states in the gap can help to reduce tunnel currents. We discuss applications of this technology for energy storage, charge storage, and power supplies. Speaker Bio: Professor Alfred Hubler is the director of the Center for

443

Technical Standards, ALOHA-Gap Analysis - May 3, 2004 | Department of  

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

ALOHA-Gap Analysis - May 3, 2004 ALOHA-Gap Analysis - May 3, 2004 Technical Standards, ALOHA-Gap Analysis - May 3, 2004 May 3, 2004 DOE-EH-4.2.1.3-ALOHA-Gap Analysis, Software Quality Assurance Improvement Plan: ALOHA Gap Analysis The Defense Nuclear Facilities Safety Board (DNFSB) issued Recommendation 2002-1 on Quality Assurance for Safety-Related Software in September 2002 (DNFSB 2002). The Recommendation identified a number of quality assurance issues for software used in the Department of Energy (DOE) facilities for analyzing hazards, and designing and operating controls that prevent or mitigate potential accidents. The development and maintenance of a collection, or "toolbox," of high-use, Software Quality Assurance (SQA)-compliant safety analysis codes is one of the major improvement

444

Optimization Online Digest -- March 2012  

E-Print Network (OSTI)

Economic and Environmental Analysis of Photovoltaic Energy Systems via Robust Optimization Shimpei Okido, Akiko Takeda Scatter search algorithms for the ...

445

Optimization Online Digest -- March 2014  

E-Print Network (OSTI)

Topology Optimization for Magnetic Circuits dedicated to Electric Propulsion ... Proximal Algorithms: Habit's/ Routine's Formation with Resistance to Change, ...

446

Optimization of Injection Scheduling in  

E-Print Network (OSTI)

SGP-TR-I12 Optimization of Injection Scheduling in Geothermal Fields James Lovekin May 1987&injection optimization problem is broke$ into two subpmbkm:(1) choosing a configuration of injectorsfrom an existing set is defined as the fieldwide break- through lindex, B. Injection is optimized by choosing injection wells

Stanford University

447

ONE DAY ON SHAPE OPTIMIZATION  

E-Print Network (OSTI)

ONE DAY ON SHAPE OPTIMIZATION Tuesday November 17, 2009 Aula Buzano - Dipartimento di Matematica to "Shape Optimization", a very active research field which combines techniques from several areas of mathematics to set out and solve problems where the optimal shape of an object has to be determined, in order

Ceragioli, Francesca

448

Adaptation, Learning, and Optimization over  

E-Print Network (OSTI)

Adaptation, Learning, and Optimization over Networks Ali H. Sayed University of California at Los 2014 A. H. Sayed DOI: 10.1561/2200000051 Adaptation, Learning, and Optimization over Networks Ali H . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.6 Notation and Symbols . . . . . . . . . . . . . . . . . . . . 8 2 Optimization by Single Agents

California at Los Angeles, University of

449

Optimal Flight Speed of Birds  

Science Journals Connector (OSTI)

...research-article Optimal Flight Speed of Birds Anders Hedenstrom Thomas Alerstam The speed of birds in flapping flight...when interpreted in the light of optimization theory, may...and review of optimal flight speeds of birds, based on foraging...

1995-01-01T23:59:59.000Z

450

Performance and Optimization  

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

Performance and Performance and Optimization Performance and Optimization Benchmarking Software on Hopper and Carver PURPOSE Test the performance impact of multithreading with representative public domain software including blastn, blastp, rpsblast, hmmsearch, usearch. Run on Hopper (24 cores/node) and Carver (8 cores/node) with different combinations of the number of tasks and threads. Provide useful set of parameters to maximize throughput PROGRAMS TESTED BLAST+ programs (blastn, blastp, rpsblast) version 2.2.26 usearch verison 5.2.32 hmmsearch version 3.0 DATASETS usearch: a collection of protein sequences (~900MB) against a reference "udb" (~900MB) blastn Query: a collection of nucleotide sequences from NCBI Microbial database from ftp://ftp.ncbi.nlm.nih.gov/refseq/release/microbial/ (34,154

451

Optimal asymptotic cloning machines  

E-Print Network (OSTI)

We pose the question whether the asymptotic equivalence between quantum cloning and quantum state estimation, valid at the single-clone level, still holds when all clones are examined globally. We conjecture that the answer is affirmative and present a large amount of evidence supporting our conjecture, developing techniques to derive optimal asymptotic cloners and proving their equivalence with estimation in virtually all scenarios considered in the literature. Our analysis covers the case of arbitrary finite sets of states, arbitrary families of coherent states, arbitrary phase- and multiphase-covariant sets of states, and two-qubit maximally entangled states. In all these examples we observe that the optimal asymptotic fidelity enjoys a universality property, as its scaling does not depend on the specific details of the set of input states, but only on the number of parameters needed to specify them.

G. Chiribella; Y. Yang

2014-11-11T23:59:59.000Z

452

Stencil Computation Optimization  

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

Stencil Stencil Computation Optimization and Auto-tuning on State-of-the-Art Multicore Architectures Kaushik Datta ∗† , Mark Murphy † , Vasily Volkov † , Samuel Williams ∗† , Jonathan Carter ∗ , Leonid Oliker ∗† , David Patterson ∗† , John Shalf ∗ , and Katherine Yelick ∗† ∗ CRD/NERSC, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA † Computer Science Division, University of California at Berkeley, Berkeley, CA 94720, USA Abstract Understanding the most efficient design and utilization of emerging multicore systems is one of the most chal- lenging questions faced by the mainstream and scientific computing industries in several decades. Our work ex- plores multicore stencil (nearest-neighbor) computations - a class of algorithms at the heart of many structured grid codes, including PDE solvers. We develop a number of effective optimization

453

HOMER® Micropower Optimization Model  

SciTech Connect

NREL has developed the HOMER micropower optimization model. The model can analyze all of the available small power technologies individually and in hybrid configurations to identify least-cost solutions to energy requirements. This capability is valuable to a diverse set of energy professionals and applications. NREL has actively supported its growing user base and developed training programs around the model. These activities are helping to grow the global market for solar technologies.

Lilienthal, P.

2005-01-01T23:59:59.000Z

454

Chaotic Dynamics in Optimal Monetary Policy  

E-Print Network (OSTI)

There is by now a large consensus in modern monetary policy. This consensus has been built upon a dynamic general equilibrium model of optimal monetary policy as developed by, e.g., Goodfriend and King (1997), Clarida et al. (1999), Svensson (1999) and Woodford (2003). In this paper we extend the standard optimal monetary policy model by introducing nonlinearity into the Phillips curve. Under the specific form of nonlinearity proposed in our paper (which allows for convexity and concavity and secures closed form solutions), we show that the introduction of a nonlinear Phillips curve into the structure of the standard model in a discrete time and deterministic framework produces radical changes to the major conclusions regarding stability and the efficiency of monetary policy. We emphasize the following main results: (i) instead of a unique fixed point we end up with multiple equilibria; (ii) instead of saddle--path stability, for different sets of parameter values we may have saddle stability, totally unstable equilibria and chaotic attractors; (iii) for certain degrees of convexity and/or concavity of the Phillips curve, where endogenous fluctuations arise, one is able to encounter various results that seem intuitively correct. Firstly, when the Central Bank pays attention essentially to inflation targeting, the inflation rate has a lower mean and is less volatile; secondly, when the degree of price stickiness is high, the inflation rate displays a larger mean and higher volatility (but this is sensitive to the values given to the parameters of the model); and thirdly, the higher the target value of the output gap chosen by the Central Bank, the higher is the inflation rate and its volatility.

Orlando Gomes; Vivaldo M. Mendes; Diana A. Mendes; J. Sousa Ramos

2006-07-28T23:59:59.000Z

455

Optimization of neutron source  

SciTech Connect

I consider here the optimization of the two component neutron source, allowing beam species and energy to vary. A simple model is developed, based on the earlier publications, that permits the optimum to be obtained simply. The two component plasma, with one species of hot ion (D{sup +} or T{sup +}) and the complementary species of cold ion, is easy to analyze in the case of a spatially uniform cold plasma, as to good approximation the total number of hot ions is important but not their spatial distribution. Consequently, the optimization can ignore spatial effects. The problem of a plasma with both types of hot ions and cold ions is rather more difficult, as the neutron production by hot-hot interactions is sensitive to their spatial distributions. Consequently, consideration of this problem will be delayed to a future memorandum. The basic model is that used in the published articles on the two-component, beam-plasma mirror source. I integrate the Fokker-Planck equation analytically, obtaining good agreement with previous numerical results. This simplifies the optimization, by providing a functional form for the neutron production. The primary result is expressed in terms of the power efficiency: watts of neutrons/watts of primary power. The latter includes the positive ion neutralization efficiency. At 150 keV, the present model obtains an efficiency of 0.66%, compared with 0.53% of the earlier calculation.

Hooper, E.B.

1993-11-09T23:59:59.000Z

456

Global-local Structural Optimization Using Response Surfaces of Local Optimization Margins  

E-Print Network (OSTI)

1 Global-local Structural Optimization Using Response Surfaces of Local Optimization Margins Boyang optimization problems. First, a large number of component optimizations for maximization of margins are performed. Response surface approximations (RSA) for maximum margins of component optimization

Neumaier, Arnold

457

Thermal-hydraulic and structural considerations on the gap variation between fuel bundle and hexcan  

SciTech Connect

One of the safety concerns in reactor operation is the temperature of the fuel elements, which are contained in a hexagonal duct, referred to as the hexcan. There are gaps between the fuel bundle and the hexcan, and the gaps somewhat affect thermal-hydraulic behavior of the fuel element. This paper investigates the impact of gap variations on the thermal-hydraulic responses of the fuel element as well as the possibility of fuel bundle and hexcan interaction. The gap variation between hex duct and fuel bundle is caused by differential thermal expansion, creep strain, and irradiation-induced swelling of fuel-cladding and hex duct, and it is a function of fuel burnup. The effects of gap variations on the thermal-hydraulic responses of typical driver subassemblies in the Experimental Breeder Reactor (EBR-II) are investigated. A structural analysis was performed to predict the in-reactor deformation behavior of fuel bundle and hex duct, and followed by a thermal-hydraulic analysis to determine the flow and temperature response due to gap changes. The effects of geometry variation on the thermal-hydraulic response are discussed. The study indicates that the effect of gap variation should not be ignored for subassembly designs.

Chang, L.K.; Lee, M.J.; Ku, J.Y.

1992-05-01T23:59:59.000Z

458

Thermal-hydraulic and structural considerations on the gap variation between fuel bundle and hexcan  

SciTech Connect

One of the safety concerns in reactor operation is the temperature of the fuel elements, which are contained in a hexagonal duct, referred to as the hexcan. There are gaps between the fuel bundle and the hexcan, and the gaps somewhat affect thermal-hydraulic behavior of the fuel element. This paper investigates the impact of gap variations on the thermal-hydraulic responses of the fuel element as well as the possibility of fuel bundle and hexcan interaction. The gap variation between hex duct and fuel bundle is caused by differential thermal expansion, creep strain, and irradiation-induced swelling of fuel-cladding and hex duct, and it is a function of fuel burnup. The effects of gap variations on the thermal-hydraulic responses of typical driver subassemblies in the Experimental Breeder Reactor (EBR-II) are investigated. A structural analysis was performed to predict the in-reactor deformation behavior of fuel bundle and hex duct, and followed by a thermal-hydraulic analysis to determine the flow and temperature response due to gap changes. The effects of geometry variation on the thermal-hydraulic response are discussed. The study indicates that the effect of gap variation should not be ignored for subassembly designs.

Chang, L.K.; Lee, M.J.; Ku, J.Y.

1992-01-01T23:59:59.000Z

459

SCR Performance Optimization Through Advancements in Aftertreatment...  

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

Performance Optimization Through Advancements in Aftertreatment Packaging SCR Performance Optimization Through Advancements in Aftertreatment Packaging The impact of improved urea...

460

Non-perturbative modelling of energetic particle effects on resistive wall mode: Anisotropy and finite orbit width  

SciTech Connect

A non-perturbative magnetohydrodynamic-kinetic hybrid formulation is developed and implemented into the MARS-K code [Liu et al., Phys. Plasmas 15, 112503 (2008)] that takes into account the anisotropy and asymmetry [Graves et al., Nature Commun. 3, 624 (2012)] of the equilibrium distribution of energetic particles (EPs) in particle pitch angle space, as well as first order finite orbit width (FOW) corrections for both passing and trapped EPs. Anisotropic models, which affect both the adiabatic and non-adiabatic drift kinetic energy contributions, are implemented for both neutral beam injection and ion cyclotron resonant heating induced EPs. The first order FOW correction does not contribute to the precessional drift resonance of trapped particles, but generally remains finite for the bounce and transit resonance contributions, as well as for the adiabatic contributions from asymmetrically distributed passing particles. Numerical results for a 9MA steady state ITER plasma suggest that (i) both the anisotropy and FOW effects can be important for the resistive wall mode stability in ITER plasmas; and (ii) the non-perturbative approach predicts less kinetic stabilization of the mode, than the perturbative approach, in the presence of anisotropy and FOW effects for the EPs. The latter may partially be related to the modification of the eigenfunction of the mode by the drift kinetic effects.

Liu, Yueqiang, E-mail: yueqiang.liu@ccfe.ac.uk; Chapman, I. T. [Euratom/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB (United Kingdom)] [Euratom/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB (United Kingdom); Graves, J. P. [Ecole Polytechnique Federale de Lausanne (EPFL), Centre de Recherches en Physique des Plasmas, Association EURATOM-Confederation Suisse, 1015 Lausanne (Switzerland)] [Ecole Polytechnique Federale de Lausanne (EPFL), Centre de Recherches en Physique des Plasmas, Association EURATOM-Confederation Suisse, 1015 Lausanne (Switzerland); Hao, G. Z. [Southwestern Institute of Physics, PO Box 432, Chengdu 610041 (China)] [Southwestern Institute of Physics, PO Box 432, Chengdu 610041 (China); Wang, Z. R.; Menard, J. E.; Okabayashi, M. [Princeton Plasma Physics Laboratory, Princeton University, PO Box 451, Princeton, New Jersey 08543-0451 (United States)] [Princeton Plasma Physics Laboratory, Princeton University, PO Box 451, Princeton, New Jersey 08543-0451 (United States); Strait, E. J.; Turnbull, A. [General Atomics, P.O. Box 85608, San Diego, California 92186-5608 (United States)] [General Atomics, P.O. Box 85608, San Diego, California 92186-5608 (United States)

2014-05-15T23:59:59.000Z

Note: This page contains sample records for the topic "optimal gap width" 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

Partial widths and gamma-ray decay of the 2883- and 5037-keV levels in Sc41  

Science Journals Connector (OSTI)

Proton and ?-ray decay widths for the 7/2+ resonance at 2883 keV excitation in Sc41 have been deduced from measurements of ??? and the (p,?) resonance strength. Our results are ??=0.058±0.007 eV and ?p=0.090±0.011 eV. Angular distributions measured for the 5037 (92+)?2883 keV and 2883?0 (72-) keV transitions confirm the J=72 assignment for the 2883-keV level. The linear polarization was measured for the 2883?0 keV transition and confirms the positive parity assignment. In addition, the (p,?) strength for the 5037-keV level was measured, and our strength results for both resonances are lower than those of Youngblood, Wildenthal, and Class by a factor of 1.4.[NUCLEAR REACTIONS Ca40(p,?), Ep=1.84,4.05 MeV; measured ?(E?,?), Q, P(90?), resonance strengths, I?. Sc41 deduced levels, J?, ??, ?p, CSp2. Enriched target.

R. L. Kozub; B. E. Cooke; J. R. Leslie; B. C. Robertson

1977-07-01T23:59:59.000Z

462

Gap formation, microsite variation and the conifer seedling occurrence in a subalpine old-growth forest, central Japan  

Science Journals Connector (OSTI)

To evaluate the effects of canopy gaps and forest floor microsites (soil, fallen logs, root ... buttresses and stumps) on regeneration of subalpine forests, the gap regeneration and seedling occurrence of conifers

Yoshiko Narukawa; Shin-Ichi Yamamoto

2001-12-01T23:59:59.000Z

463

Defect assistant band alignment transition from staggered to broken gap in mixed As/Sb tunnel field effect transistor heterostructure  

E-Print Network (OSTI)

.3As heterointerface. As a result, the band alignment was converted from staggered gap to broken gap-to-source voltage, VGS. As the SS of a MOSFET is governed by the transport mechanism of thermionic-emission over

Yener, Aylin

464

Convex Optimization: from Real-Time Embedded  

E-Print Network (OSTI)

Convex Optimization: from Real-Time Embedded to Large-Scale Distributed Stephen Boyd Neal Parikh of Edinburgh, June 25 2014 1 #12;Outline Convex Optimization Real-Time Embedded Optimization Large-Scale Distributed Optimization Summary 2 #12;Outline Convex Optimization Real-Time Embedded Optimization Large

Hall, Julian

465

Measurements of CsI band-gap closure to 93 GPa  

Science Journals Connector (OSTI)

Infrared-absorption measurements to a peak pressure of 93 GPa document the pressure-induced closure of the band gap of CsI to about 4450 cm-1 (0.55 eV). In accord with previous spectroscopic measurements to 60 GPa, our data show that the band gap of CsI decreases continuously with pressure, and metallization (complete closure of the gap) is expected to occur above 100 GPa. A recent claim that CsI becomes metallic at 65±5 GPa is therefore spurious.

Quentin Williams and Raymond Jeanloz

1986-01-13T23:59:59.000Z

466

On the entropy devil's staircase in a family of gap-tent maps  

E-Print Network (OSTI)

We analyze dynamical properties of a "gap-tent map" - a family of 1D maps with a symmetric gap, which mimics the presence of noise in physical realizations of chaotic systems. We demonstrate that the dependence of the topological entropy on the size of the gap has a structure of the devil's staircase. By integrating over a fractal measure, we obtain analytical, piece-wise differentiable approximations of this dependence. Applying concepts of the kneading theory we find the position and the values of the entropy for all leading entropy plateaus. Similar properties hold also for the dependence of the fractal dimension of the invariant set and the escape rate.

Karol Zyczkowski; Erik M. Bollt

1998-07-07T23:59:59.000Z

467

Theorem on the existence of a nonzero energy gap in adiabatic quantum computation  

E-Print Network (OSTI)

Adiabatic quantum computation, based on the adiabatic theorem, is a promising alternative to conventional quantum computation. The validity of an adiabatic algorithm depends on the existence of a nonzero energy gap between the ground and excited states. However, it is difficult to ascertain the exact value of the energy gap. In this paper, we put forward a theorem on the existence of nonzero energy gap for the Hamiltonians used in adiabatic quantum computation. It can help to effectively identify a large class of the Hamiltonians without energy-level crossing between the ground and excited states.

Da-Jian Zhang; Xiao-Dong Yu; D. M. Tong

2014-10-14T23:59:59.000Z

468

Multicriteria VMAT optimization  

SciTech Connect

Purpose: To make the planning of volumetric modulated arc therapy (VMAT) faster and to explore the tradeoffs between planning objectives and delivery efficiency. Methods: A convex multicriteria dose optimization problem is solved for an angular grid of 180 equi-spaced beams. This allows the planner to navigate the ideal dose distribution Pareto surface and select a plan of desired target coverage versus organ at risk sparing. The selected plan is then made VMAT deliverable by a fluence map merging and sequencing algorithm, which combines neighboring fluence maps based on a similarity score and then delivers the merged maps together, simplifying delivery. Successive merges are made as long as the dose distribution quality is maintained. The complete algorithm is called VMERGE. Results: VMERGE is applied to three cases: a prostate, a pancreas, and a brain. In each case, the selected Pareto-optimal plan is matched almost exactly with the VMAT merging routine, resulting in a high quality plan delivered with a single arc in less than 5 min on average. Conclusions: VMERGE offers significant improvements over existing VMAT algorithms. The first is the multicriteria planning aspect, which greatly speeds up planning time and allows the user to select the plan, which represents the most desirable compromise between target coverage and organ at risk sparing. The second is the user-chosen epsilon-optimality guarantee of the final VMAT plan. Finally, the user can explore the tradeoff between delivery time and plan quality, which is a fundamental aspect of VMAT that cannot be easily investigated with current commercial planning systems.

Craft, David; McQuaid, Dualta; Wala, Jeremiah; Chen, Wei; Salari, Ehsan; Bortfeld, Thomas [Department of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114 (United States); Joint Department of Physics, Institute of Cancer Research and Royal Marsden NHSFT, Sutton, London, SM2 5PT (United Kingdom); Department of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114 (United States)

2012-02-15T23:59:59.000Z

469

Fact #837: September 8, 2014 Gap between Net Imports and Total Imports of Petroleum is Widening – Dataset  

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

Excel file with dataset for Fact #837: Gap between Net Imports and Total Imports of Petroleum is Widening

470

The microscopic pairing gap in a slab of nuclear matter for the Argonne v18 NN-potential  

Science Journals Connector (OSTI)

Ab initio gap equation for 1S0 pairing in a nuclear slab is solved for the Argonne v18 NN-potential. The gap function is compared in detail with the one found previously for the separable form of the Paris potential. The difference between the two gaps turned out to be about 10%. Dependence of the gap on the chemical potential ? is analyzed.

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

2008-01-01T23:59:59.000Z

471

The microscopic pairing gap in a slab of nuclear matter for the Argonne v18 NN-potential  

E-Print Network (OSTI)

Ab initio gap equation for ^1S_0 pairing in a nuclear slab is solved for the Argonne v18 NN-potential. The gap function is compared in detail with the one found previously for the separable form of the Paris potential. The difference between the two gaps turned out to be about 10%. Dependence of the gap on the chemical potential mu is analyzed.

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

2008-01-12T23:59:59.000Z

472

Optimal irreversible stimulated emission  

E-Print Network (OSTI)

We studied the dynamics of an initially inverted atom in a semi-infinite waveguide, in the presence of a single propagating photon. We show that atomic relaxation is enhanced by a factor of 2, leading to maximal bunching in the output field. This optimal irreversible stimulated emission is a novel phenomenon that can be observed with state-of-the-art solid-state atoms and waveguides. When the atom interacts with two one-dimensional electromagnetic environments, the preferential emission in the stimulated field can be exploited to efficiently amplify a classical or a quantum state.

D Valente; Y Li; J P Poizat; J M Gerard; L C Kwek; M F Santos; A Auffeves

2012-08-28T23:59:59.000Z

473

Granby Pumping Plant Switchyard - Windy Gap Substation Transmission Line Rebuild, Grand County, Colorado: Final Environmental Impact Statement Appendices  

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

PUMPING PLANT SWITCHYARD - WINDY GAP PUMPING PLANT SWITCHYARD - WINDY GAP SUBSTATION TRANSMISSION LINE REBUILD, GRAND COUNTY, COLORADO DOE/EIS-0400 Final Environmental Impact Statement Appendices Grand County, Colorado June 2013 Appendix A EIS Scoping Report GRANBY PUMPING PLANT - WINDY GAP TRANSMISSION LINE REBUILD PROJECT ENVIRONMENTAL IMPACT STATEMENT SCOPING SUMMARY REPORT December 4, 2007

474

Direct measurement of the W boson decay width in proton-antiproton collisions at s**(1/2) = 1.96-TeV  

SciTech Connect

This dissertation describes a direct measurement of the W boson total decay width, {Lambda}{sub W}, using the D0 detector at the Fermilab Tevatron Collider. The measurement uses an integrated luminosity of 177.3 pb{sup -1} data, collected during the 2002-2003 run. The width is determined from the shape of the transverse mass distribution, M{sub T}, by fitting the data in the tail region 100 < M{sub T} < 200 GeV. The result if {Lambda}{sub W} = 2.011 {+-} 0.093(stat) {+-} 0.107(syst) GeV.

Zhu, Jun-jie; /Maryland U.

2004-10-01T23:59:59.000Z

475

Invisible Z decay width bounds on active-sterile neutrino mixing in the (3+1) and (3+2) models  

E-Print Network (OSTI)

In this work we consider the standard model extended with singlet sterile neutrinos with mass in the eV range and mixed with the active neutrinos. The active-sterile neutrino mixing renders new contributions to the invisible Z decay width which, in the case of light sterile neutrinos, depends on the active-sterile mixing matrix elements only. We then use the current experimental value of the invisible Z decay width to obtain bounds on these mixing matrix elements for both (3+1) and (3+2) models.

C. A. de S. Pires

2007-06-08T23:59:59.000Z

476

Optimization Online - Ship Traffic Optimization for the Kiel Canal  

E-Print Network (OSTI)

Dec 1, 2014 ... ... optimization problem which we call the ship traffic control problem (STCP). ... We offer a unified view of routing and scheduling which blends ...

Elisabeth Lübbecke

2014-12-01T23:59:59.000Z

477

Optimization Online - Optimal Power Grid Protection through A ...  

E-Print Network (OSTI)

Feb 22, 2013 ... Optimal Power Grid Protection through A Defender-Attacker-Defender Model. Wei Yuan (weiyuan ***at*** mail.usf.edu) Long Zhao (longzhao ...

Wei Yuan

2013-02-22T23:59:59.000Z

478

Optimization Online - Hypotheses testing on the optimal values of ...  

E-Print Network (OSTI)

Jul 24, 2014 ... Hypotheses testing on the optimal values of several risk-neutral or risk-averse convex stochastic programs and application to hypotheses ...

Vincent Guigues

2014-07-24T23:59:59.000Z

479

On Second Order Optimality Conditions in Nonlinear Optimization  

E-Print Network (OSTI)

Aug 15, 2014 ... Abstract: In this work we present new weak conditions that ensure the validity of necessary second order optimality conditions (SOC) for ...

Roberto Andreani

2014-08-15T23:59:59.000Z

480

On Second Order Optimality Conditions in Nonlinear Optimization  

E-Print Network (OSTI)

Aug 15, 2014 ... [20] Jorge Nocedal and Stephen J. Wright. Numerical optimization. Springer,. New York, 2nd ed. edition, 2006. [21] R. Tyrrell Rockafellar.

2014-08-15T23:59:59.000Z

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


481

Optimization Online - Cut Generation for Optimization Problems with ...  

E-Print Network (OSTI)

Jul 26, 2014 ... Cut Generation for Optimization Problems with Multivariate Risk Constraints. Simge Küçükyavuz (kucukyavuz.2 ***at*** osu.edu) Nilay Noyan ...

Simge Küçükyavuz

2014-07-26T23:59:59.000Z

482

Clock Distribution Network Optimization by Sequential Quadratic Programing  

E-Print Network (OSTI)

., i.e., L(x; ) = xTD ( 2): (2.4) Denote by rxL(x; ) the gradient vector of the Lagrangian function, i.e., rxL(x; ) = D + rx 2: (2.5) For a speci c setup of all mesh wire widths in the clock network, the gradient of sink delay variance, rx 2, can... and the constraints are satis ed at the optimal point, i.e., for our problem, D + rx 2 = 0; (2.6) 2 0: (2.7) One common way to solve an equation as Eqn. 2.6. is Newton?s method. Basi- cally, Newton?s method searches for the root of an equation f(x) = 0...

Mekala, Venkata

2010-07-14T23:59:59.000Z

483

Kernel Optimizations in SORD  

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

Kernel Optimizations in SORD Kernel Optimizations in SORD earthquake dynamic rupture code Geoffrey P. Ely Leadership Computing Facility Argonne National Laboratory MiraCon March 7, 2013 S C E C an NSF+USGS center Acknowledgements Tareq Malas King Abdullah Univ. of Science & Technology Vitali Morozov Argonne Leadership Computing Facility Karen Magerlein IBM Watson Research Center Simulation Scale Outer length scale: ~500km Inner length scale: ~50m Mesh points: ~10 12 Spatial Derivatives f (⇠) = n X ↵, , =0 N ↵ (⇠)f ↵ rf = @f @⇠ · J 1 x y z ⇠ ⌘ ⇣ Equations of Motion Viscoelastic Solid (Kelvin-Voigt Model) Free surface boundary condition ¨ u = 1 ⇢ r · g = r(u + ˙ u) = trace(g) + µ(g + g T ) ⇢ density , µ elastic moduli viscosity u displacement stress tensor ⌧ = · ˆ n = 0 ! Kernel with 12 Streams do l = 1, 400 do k = 1, 400

484

Low Rank Coal Optimization  

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

Low Rank Coal Optimization Low Rank Coal Optimization NETL Office of Research and Development Project Number: FWP-2012.03.03 Task 4 Project Description NETL's in-house research team is using an integrated approach to combine theory, computational modeling, experiment, and industrial input to develop physics-based methods, models, and tools to support the development and deployment of advanced gasification based devices and systems. The activities in this effort include developing and applying computational and modeling tools to simulate complex flows in applications such as transport or entrained flow gasifiers. TRIG Model Development - The primary objective of this work is to develop a hierarchy of models for numerical simulations of TRIG co-feed conditions that span fast running reduced order models (ROM's) to high fidelity multiphase computational fluid dynamics (CFD) models. Each model will have uncertainty quantification associated with its predictions to allow a user to choose a model based on the trade-offs between computational speed and uncertainty in the predictions.

485

Patents and Clean Energy: Bridging the Gap Between Evidence and Policy |  

Open Energy Info (EERE)

Patents and Clean Energy: Bridging the Gap Between Evidence and Policy Patents and Clean Energy: Bridging the Gap Between Evidence and Policy Jump to: navigation, search Name Patents and Clean Energy: Bridging the Gap Between Evidence and Policy Agency/Company /Organization United Nations Environment Programme Sector Energy Focus Area Renewable Energy Topics Market analysis, Policies/deployment programs Resource Type Publications Website http://www.unep.org/greenecono References Patents and Clean Energy: Bridging the Gap Between Evidence and Policy[1] Overview "Technology development and its rapid diffusion are considered crucial for tackling the climate change challenge. In particular, enhancing technology transfer towards developing countries has been an integral part of the global climate change regime since the inception of the United Nations

486

Event:GGKP-Green Growth: Addressing the Knowledge Gaps Day 1 | Open Energy  

Open Energy Info (EERE)

GGKP-Green Growth: Addressing the Knowledge Gaps: on 2012/01/12 GGKP-Green Growth: Addressing the Knowledge Gaps: on 2012/01/12 The Green Growth Knowledge Platform (GGKP) will hold its inaugural conference, "Green Growth: Addressing the Knowledge Gaps," January 12-13, 2012, in Mexico City Mexico. The conference aims to take stock of the current understanding of the economics of green growth; engage researchers and practitioners in an ongoing dialogue to increase understanding of how green growth approaches can be applied in the field; identify knowledge gaps and establish priorities for knowledge-building work and implementation; and launch follow-on efforts. The conference location will allow attendees to benefit from Mexico's experiences from taking a leading role internationally in advocating pathways to green development.

487

Integration of MEA Components-Status and Technology Gaps: A Stakeholders Perspective  

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

DOE Fuel Cell Pre-Solicitation Workshop DOE Fuel Cell Pre-Solicitation Workshop March 16-17, 2010 Denver, CO 3M Fuel Cell Components Program Mark Debe, Steve Hamrock, Radoslav Atanasoski, Pinar Serim, Eric Funkenbusch, Mike Yandrasits, Stan Garnsworthy and Customers Integration of MEA Components - Status and Technology Gaps - A Stakeholder's Perspective 2 Outline: 1. What does MEA integration mean? 2. Where the technology may be going with regard to 2015 3. Status and relative gaps for 2015 at the individual component level 4. Status and relative gaps for 2015 at the MEA integration level 5. Suggestions where DOE should concentrate its efforts in the near future 6. Other general suggestions and recommendations Integration of MEA Components 3M perspectives on technology development needs and gaps. 3M U.S. DOE Fuel Cell Pre-Solicitation Workshop Denver, CO, March 16-17, 2010

488

Fact #837: September 8, Gap between Net Imports and Total Imports of Petroleum is Widening  

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

Net imports of petroleum (total imports minus exports) were 6.2 million barrels per day in 2013 – the lowest since the 1980's (dark blue line). The widening gap between total imports (light blue...

489

Artificial Neural Network Models for the Gap Discontinuities in Stripline Circuits  

Science Journals Connector (OSTI)

Gap discontinuities appear in many stripline circuits, such as the multilayer microwave monolithic ICs and the interconnect systems in high-speed digital circuits. In this paper, a multilayer perceptron neural...

Bing-Zhong Wang; Jingsong Hong

2000-05-01T23:59:59.000Z

490

Molten Carbonate and Phosphoric Acid Stationary Fuel Cells: Overview and Gap Analysis  

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

This report describes the technical and cost gap analysis performed to identify pathways for reducing the costs of molten carbonate fuel cell (MCFC) and phosphoric acid fuel cell (PAFC) stationary fuel cell power plants.

491

Band gap and electronic structure of MgSiN{sub 2}  

SciTech Connect

Density functional theory calculations and electron energy loss spectroscopy indicate that the electronic structure of ordered orthorhombic MgSiN{sub 2} is similar to that of wurtzite AlN. A band gap of 5.7?eV was calculated for both MgSiN{sub 2} (indirect) and AlN (direct) using the Heyd-Scuseria-Ernzerhof approximation. Correction with respect to the experimental room-temperature band gap of AlN indicates that the true band gap of MgSiN{sub 2} is 6.2?eV. MgSiN{sub 2} has an additional direct gap of 6.3?eV at the ? point.

Quirk, J. B., E-mail: james.quirk09@imperial.ac.uk; Råsander, M.; McGilvery, C. M.; Moram, M. A. [Department of Materials, Imperial College London, Exhibition Road, London SW7 2AZ (United Kingdom); Palgrave, R. [Department of Chemistry, University College London, Gordon Street WC1H 0AJ (United Kingdom)

2014-09-15T23:59:59.000Z

492

The role of gap phase processes in the biomass dynamics of tropical forests  

Science Journals Connector (OSTI)

...gap phase processes in the biomass dynamics of tropical forests...understood. Above-ground woody biomass in some tropical forest...greenhouse gas emissions from biomass burning, decomposition and soils forest in conversion, shifting cultivation and...

2007-01-01T23:59:59.000Z

493

Ternary silicon germanium nitrides: A class of tunable band gap materials  

Science Journals Connector (OSTI)

Ternary silicon germanium nitrides with compositions of both Si1?xGexN and (Si1?xGex)3N4 are predicted to have a band gap that decreases as the germanium:silicon ratio increases. The band gap is indirect for the silicon-rich compounds but becomes direct as the germanium content increases, due to greater mixing of s and p states in the conduction band. This effect of band gap tunability has recently been reported for (Si1?xGex)3N4 in the spinel structure [Boyko et al., Phys. Rev. B 81, 155207 (2010)]. Our results suggest that this is a more general effect and that ternary group-14 nitrides should form a class of semiconducting materials for which the band gap can be tuned by controlling the composition.

Judy N. Hart; Neil L. Allan; Frederik Claeyssens

2011-12-27T23:59:59.000Z

494

Photonic band gap of a graphene-embedded quarter-wave stack  

SciTech Connect

Here, we present a mechanism for tailoring the photonic band structure of a quarter-wave stack without changing its physical periods by embedding conductive sheets. Graphene is utilized and studied as a realistic, two-dimensional conductive sheet. In a graphene-embedded quarter-wave stack, the synergic actions of Bragg scattering and graphene conductance contributions open photonic gaps at the center of the reduced Brillouin zone that are nonexistent in conventional quarter-wave stacks. Such photonic gaps show giant, loss-independent density of optical states at the fixed lower-gap edges, of even-multiple characteristic frequency of the quarter-wave stack. The conductive sheet-induced photonic gaps provide a platform for the enhancement of light-matter interactions.

Fan, Yuancheng [Ames Laboratory; Wei, Zeyong [Tongji University; Li, Hongqiang [Tongji University; Chen, Hong [Tongji University; Soukoulis, Costas M [Ames Laboratory

2013-12-10T23:59:59.000Z

495

Strain-induced band-gap engineering of graphene monoxide and its effect on graphene  

Science Journals Connector (OSTI)

Using first-principles calculations we demonstrate the feasibility of band-gap engineering in two-dimensional crystalline graphene monoxide (GMO), a recently reported graphene-based material with a 1:1 carbon/oxygen ratio. The band gap of GMO, which can be switched between direct and indirect, is tunable over a large range (0–1.35 eV) for accessible strains. Electron and hole transport occurs predominantly along the zigzag and armchair directions (armchair for both) when GMO is a direct- (indirect-) gap semiconductor. A band gap of ?0.5 eV is also induced in graphene at the K? points for GMO/graphene hybrid systems.

H. H. Pu; S. H. Rhim; C. J. Hirschmugl; M. Gajdardziska-Josifovska; M. Weinert; J. H. Chen

2013-02-13T23:59:59.000Z

496

Review: Teach! Change! Empower! Solutions for Closing the Achievement Gaps by Carl A. Grant  

E-Print Network (OSTI)

the Achievement Gaps by Carl A. Grant. Thousand Oaks, CA:p. 7). In this spirit Carl A. Grant presents Teach! Change!In this workbook-like text, Grant stresses reflection as a

Turner, Rhonda J

2010-01-01T23:59:59.000Z

497

Direct gap photoluminescence of n-type tensile-strained Ge-on-Si  

E-Print Network (OSTI)

Room temperature direct gap photoluminescence (PL) was observed from n-type tensile-strained epitaxial Ge-on-Si. The PL intensity increases with n-type doping due to a higher electron population in the direct ? valley as ...

Sun, Xiaochen

498

Large inherent optical gain from the direct gap transition of Ge thin films  

E-Print Network (OSTI)

The recent demonstration of Ge-on-Si diode lasers renews the interest in the unique carrier dynamics of Ge involving both direct (?) and indirect (L) valleys. Here, we report a large inherent direct gap optical gain ...

Wang, Xiaoxin

499

Codes and Standards Gap Analysis Helps DOE Define Research Priorities (Fact Sheet)  

SciTech Connect

This fact sheet describes NREL's accomplishments in analyzing gaps in codes and standards for alternative vehicle fuels, including hydrogen. Work was performed by the Hydrogen Technologies and Systems Center.

Not Available

2010-11-01T23:59:59.000Z

500

E-Print Network 3.0 - auditory gap detection Sample Search Results  

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

Sample search results for: auditory gap detection Page: << < 1 2 3 4 5 > >> 1 Exp Brain Res (2005) 162: 172180 DOI 10.1007s00221-004-2128-2 Summary: what you hear: auditory...