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1

BIOLOGY PROGRAMME ADVISORS Edna Staples LSC 6089 494.2464 Edna.Staples@dal.ca  

E-Print Network [OSTI]

BIOLOGY PROGRAMME ADVISORS Edna Staples LSC 6089 494.2464 Edna.Staples@dal.ca Jennifer Van Dommelen LSC 813 494.1584 Jvandomm@dal.ca Todd Bishop LSC 2089 494.1696 Todd.Bishop@dal.ca BIOLOGY MAJOR (20 credit or 15 credit concentration) Christine Beauchamp LSC 4015 494.2045 Christine.Beauchamp@dal.ca

Gunawardena, Arunika

2

United States Geological Survey, LSC | Open Energy Information  

Open Energy Info (EERE)

LSC LSC Jump to: navigation, search Hydro | Hydrodynamic Testing Facilities Name United States Geological Survey, LSC Address Leetown Science Center, Conte Anadromous Fish Laboratory, 1 Migratory Way Place Turners Falls, Massachusetts Zip 01376 Sector Hydro Phone number (413) 863-9475 Website http://www.lsc.usgs.gov/CAFLin Coordinates 42.5998509掳, -72.5679159掳 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":42.5998509,"lon":-72.5679159,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

3

EVLA Memo 94 L/S/C Converter Plate Phase Stability Test II  

E-Print Network [OSTI]

connections and 2 Storm cables for the constant chamber signal connections, foam insulation pads, 3 power, for the cables to and from the L/S/C converter plates were not insulated. During the second temperature chamber test, cable entry/exit holes were insulated well. #12;Methods The same methods as those described

Groppi, Christopher

4

Implementation of direct LSC method for diesel samples on the fuel market  

Science Journals Connector (OSTI)

Abstract The European Union develops common EU policy and strategy on biofuels and sustainable bio-economy through several documents. The encouragement of biofuel?s consumption is therefore the obligation of each EU member state. The situation in Slovenian fuel market is presented and compared with other EU countries in the frame of prescribed values from EU directives. Diesel is the most common fuel for transportation needs in Slovenia. The study was therefore performed on diesel. The sampling net was determined in accordance with the fuel consumption statistics of the country. 75 Sampling points were located on different types of roads. The quantity of bio-component in diesel samples was determined by direct LSC method through measurement of C-14 content. The measured values were in the range from 0 up to nearly 6 mass percentage of bio-component in fuel. The method has proved to be appropriate, suitable and effective for studies on the real fuel market.

Romana Kri歵of; Marko Hirsch; Jasmina Ko瀉r Logar

2014-01-01T23:59:59.000Z

5

PCCM has had many successful partnerships with Liberty Science Center (LSC), New Jersey's premier science center, which has served more than 9 million guests  

E-Print Network [OSTI]

PCCM has had many successful partnerships with Liberty Science Center (LSC), New Jersey's premier recently, these included high-school junior Moyukh Chatterjee whose project "Growth and imaging of Bi

Petta, Jason

6

HOW GOOD ARE SLICING FLOORPLANS? F. Y. Young and D.F. Wong  

E-Print Network [OSTI]

with flexibility in shape, we show that there exists a slicing floorplan F such that area(F) 5 min{(l + & ), 2, (1 + cr)}Atotoz where Atotal is the total area of all the modules, A,,, is the maximum module area, (Y= J floorplans. As a re- sult, slicing floorplans are used in many existing floorplan- ning systems [4, 3, 6, 51

Young, Evangeline Fun Yu

7

A Theoretical Upper Bound for IP-Based Floorplanning Guowu Yang1, Xiaoyu Song1, Hannah H. Yang2, and Fei Xie3  

E-Print Network [OSTI]

Amax, and shape flexibility r 2.25, there exists a slic- ing floorplan F of these modules such that Area(F) min{1.131,(1+)}Atotal, where = Amax 2rAtotal . Our results ameliorate the existing best

Xie, Fei

8

Chromium (III), Titanium (III), and Vanadium (IV) sensitization of rare earth complexes for luminescent solar concentrator applications  

E-Print Network [OSTI]

High optical concentrations without excess heating in a stationary system can be achieved with a luminescent solar concentrator (LSC). Neodymium (Nd) and ytterbium (Yb) are excellent infrared LSC materials: inexpensive, ...

Thompson, Nicholas John

2011-01-01T23:59:59.000Z

9

Chemical Heterogeneities on La[subscript 0.6]Sr[subscript 0.4]CoO[subscript 3??] Thin Films--Correlations to Cathode Surface Activity and Stability  

E-Print Network [OSTI]

La[subscript 0.6]Sr[subscript 0.4]CoO[subscript 3??](LSC) thin film cathodes synthesized by pulsed laser deposition at 450癈 (LSC_450癈) and 650癈 (LSC_650癈) exhibit different electrochemical performance. The origin of ...

Cai, Zhuhua

10

ELECTRICAL & COMPUTER ENGINEERING  

E-Print Network [OSTI]

ELECTRICAL & COMPUTER ENGINEERING SEMINAR "Considerations for Curriculum Planning and Computer Engineering Colorado State University Monday, Feb. 20, 2012, 11:00 a.m. Location: LSC 210 Abstract

11

1  

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

- employed, for example, in the newest generation of the Kindle Fire (tm) e-reader. Light-harvesting antennas A luminescent solar concentrator (LSC) is a photon management...

12

CO Substitution in HOs3(CO)10(l-SC6H4Me-4) by the Diphosphine 4,5-Bis(diphenylphosphino)-4-cyclopentadiene-1,3-dione (bpcd): Structural and DFT Evaluation of the Isomeric Clusters HOs3(CO)8(bpcd)(mu-SC6H4Me-4)  

SciTech Connect (OSTI)

The reaction of the cluster HOs{sub 3}(CO){sub 10}({mu}-SC{sub 6}H{sub 4}Me-4) (1) with the diphosphine 4,5-bis(diphenylphosphino)-4-cyclopentadiene-1,3-dione (bpcd) has been investigated. 1 reacts with bpcd at room temperature in the presence of Me{sub 3}NO to give the isomeric clusters 1,2-HOs{sub 3}(CO)8(bpcd)({mu}-SC{sub 6}H{sub 4}Me-4) (2a) and 1,1-HOs{sub 3}(CO)8(bpcd)({mu}-SC{sub 6}H{sub 4}Me-4) (2b). Clusters 2a and 2b have been isolated, and the molecular structure of each compound has been established by X-ray crystallography. The X-ray structure of 2a confirms the coordination of one of the non-hydride-bridged Os-Os vectors by the bpcd ligand, while the structure of 2b exhibits a chelating bpcd ligand that is bound to one of the osmium centers ligated by the thiolate and hydrido ligands. 2a and 2b are stable in refluxing toluene and show no evidence for bridge-to-chelate isomerization of the ancillary bpcd ligand. DFT calculations on 2a and 2b indicate that the former cluster is the thermodynamically more stable isomer. Near-UV irradiation of 2b leads to CO loss and ortho metalation of the thiolate moiety, yielding the dihydride cluster H{sub 2}Os{sub 3}(CO)7(bpcd)({mu},{sigma}-SC{sub 6}H{sub 3}Me-4) (3). The conversion of 2b to 3 and free CO is computed to be endothermic by 14.1 kcal/mol and the reaction is driven by the entropic release of CO. The photochemically promoted ortho-metalation reaction is isomer dependent since cluster 2a is inert under identical conditions.

Yang, Li [University of North Texas; Nesterov, Vladimir [University of North Texas; Wang, Xiaoping [ORNL; Richmond, Michael G. [University of North Texas

2012-01-01T23:59:59.000Z

13

Mechanism for enhanced oxygen reduction kinetics at the (La,Sr)CoO3??/(La,Sr)2CoO4+? hetero-interface  

E-Print Network [OSTI]

The recently reported fast oxygen reduction kinetics at the interface of (La,Sr)CoO3?? (LSC113) and (La,Sr)2CoO4+? (LSC214) phases opened up new questions for the potential role of dissimilar interfaces in advanced cathodes ...

Han, Jeong Woo

14

Download Full-text PDF  

Science Journals Connector (OSTI)

density is r 5 1040 kg mJ3 (Hale 2001). .... has been successfully used to describe interfacial gas .... (Tekmar LSC 2000) in concert with a gas chromatograph.

2014-10-06T23:59:59.000Z

15

Collective behavior of semiconductor nanoparticles for use in solar energy harvesting  

E-Print Network [OSTI]

the power conversion efficiency (PCE) of the device. In thismetric, we calculate the PCE for our samples as the ratio ofLSC. The PbS sample has a PCE of 3.2%, comparable to that of

Shcherbatyuk, Georgiy

2012-01-01T23:59:59.000Z

16

E-Print Network 3.0 - alpha-spectrometry vliyanie toriya Sample...  

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

by activity determination using combinations of LSC, alpha spectrometry or ICP-MS. Uranium... Extraction with TBP from 8 M HNO3, rinse with 1.2 M HCl and elution with water...

17

Breakdown of large-scale circulation in turbulent rotating convection  

Science Journals Connector (OSTI)

Turbulent rotating convection in a cylinder is investigated both numerically and experimentally at Rayleigh number Ra=109 and Prandtl number ?=6.4. In this letter we discuss two topics: the breakdown under rotation of the domain-filling large-scale circulation (LSC) typical for confined convection, and the convective heat transfer through the fluid layer, expressed by the Nusselt number. The presence of the LSC is addressed for several rotation rates. For Rossby numbers Ro1.2 no LSC is found (the Rossby number indicates relative importance of buoyancy over rotation, hence small Ro indicates strong rotation). For larger Rossby numbers a precession of the LSC in anticyclonic direction (counter to the background rotation) is observed. It is shown that the heat transfer has a maximal value close to Ro=0.18 being about 15% larger than in the non-rotating case Ro=?. Since the LSC is no longer present at this Rossby value we conclude that the peak heat transfer is independent of the LSC.

R. P. J. Kunnen; H. J. H. Clercx; B. J. Geurts

2008-01-01T23:59:59.000Z

18

Standardization of 18F by Digital beta(LS)-gamma Coincidence Counting  

E-Print Network [OSTI]

The nuclide 18F disintegrates to 18O by beta+ emission (96.86%) and electron capture (3.14%) with a half-life of 1.8288 h. It is widely used in nuclear medicine for positron emission tomography (PET). Because of its short half-life this nuclide requires the development of fast measuring methods to be standardized. The combination of LSC methods with digital techniques proves to be a good alternative to get low uncertainties for this, and other, short lived nuclides. A radioactive solution of 18F has been standardized by coincidence counting with a LSC, using the logical sum of double coincidences in a TDCR array and a NaI scintillation detector. The results show good consistency with other techniques like 4Pi gamma and LSC.

Rodrigues D.; Balpardo C.; Cassette P.; Arenillas P.; Capoulat M. E.; Ceruti G.; Garc韆-Tora駉 E

2010-12-17T23:59:59.000Z

19

Lighting system combining daylight concentrators and an artificial source  

DOE Patents [OSTI]

A combined lighting system for a building interior includes a stack of luminescent solar concentrators (LSC), an optical conduit made of preferably optical fibers for transmitting daylight from the LSC stack, a collimating lens set at an angle, a fixture for receiving the daylight at one end and for distributing the daylight as illumination inside the building, an artificial light source at the other end of the fixture for directing artifical light into the fixture for distribution as illumination inside the building, an automatic dimmer/brightener for the artificial light source, and a daylight sensor positioned near to the LSC stack for controlling the automatic dimmer/brightener in response to the daylight sensed. The system also has a reflector positioned behind the artificial light source and a fan for exhausting heated air out of the fixture during summer and for forcing heated air into the fixture for passage into the building interior during winter.

Bornstein, Jonathan G. (Miami, FL); Friedman, Peter S. (Toledo, OH)

1985-01-01T23:59:59.000Z

20

Spatial coherence effect on layer thickness determination in narrowband full-field optical coherence tomography  

SciTech Connect (OSTI)

Longitudinal spatial coherence (LSC) is determined by the spatial frequency content of an optical beam. The use of lenses with a high numerical aperture (NA) in full-field optical coherence tomography and a narrowband light source makes the LSC length much shorter than the temporal coherence length, hence suggesting that high-resolution 3D images of biological and multilayered samples can be obtained based on the low LSC. A simplified model is derived, supported by experimental results, which describes the expected interference output signal of multilayered samples when high-NA lenses are used together with a narrowband light source. An expression for the correction factor for the layer thickness determination is found valid for high-NA objectives. Additionally, the method was applied to a strongly scattering layer, demonstrating the potential of this method for high-resolution imaging of scattering media.

Safrani, Avner; Abdulhalim, Ibrahim

2011-06-20T23:59:59.000Z

Note: This page contains sample records for the topic "lsc floorplan lsc" 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

Full Spectrum Diffused and Beamed Solar Energy Application Using Optical Fibre  

E-Print Network [OSTI]

Existing solar energy application systems use small fraction of full spectrum of solar energy. So attempts are made to show how full spectrum solar energy can be used for diffused and beamed form of incident solar energy. Luminescent Solar Concentrator (LSC) principle with optical fibre in diffused sun light and dielectric mirror separation technique with optical fibre in beamed form are discussed. Comparison of both the cases are done. Keywords: full spectrum, solar photonics, diffused solar energy, beamed solar energy, LSC, dielectric mirror, optical fibre, Photo-Voltaic

Dutta Majumdar, M R

2007-01-01T23:59:59.000Z

22

Progress in LHCD modeling and experiments towards the AT regime on Alcator C-Mod  

SciTech Connect (OSTI)

Electron internal transport barrier (ITB) formation is observed during fully non-inductive LHCD discharges on Alcator C-Mod. The formation is characterized by an abrupt increase of the central electron temperature after a few current penetration time has passed following LHCD turn-on. The ITB phase is often terminated by m = 2 mode activity. Kinetic equilibrium reconstruction and TRANSP/LSC analysis show shear reversal in the q profile during the ITB phase. TRANSP/LSC predictive analysis suggests that f{sub Bs}{approx}60% is possible if a similar temperature gradient is maintained at r/a{approx}0.5 with H-factor of 1.

Shiraiwa, S.; Bonoli, P. T.; Faust, I.; Meneghini, O.; Hubbard, A.; Parker, R. R.; Schmidt, A. E.; Wallace, G. M.; Hughes, J. W.; Mumgaard, R. [MIT Plasma Science and Fusion Center, Cambridge, MA (United States); Scott, S.; Wilson, J. R. [Princeton Plasma Physics Laboratory, Princeton, NJ USA (United States); Harvey, R. W.; Smirnov, A. P. [CompX, Del Mar, CA (United States)

2011-12-23T23:59:59.000Z

23

ACTIVE CATHODES FOR SUPER-HIGH POWER DENSITY SOLID OXIDE FUEL CELLS THROUGH SPACE CHARGE EFFECTS  

SciTech Connect (OSTI)

This report summarizes the work done during the third quarter of the project. Effort was directed in two areas: (1) Further development of the model on the role of connectivity on ionic conductivity of porous bodies, including the role of grain boundaries, and its relationship to cathode polarization. Included indirectly through the grain boundary effect is the effect of space charge. (2) Synthesis of LSC + SDC composite cathode powders by combustion synthesis. (3) Fabrication and testing of anode-supported single cells made using synthesized LSC + ScDC composite cathodes.

Anil V. Virkar

2003-11-03T23:59:59.000Z

24

LASER SAFETY COMMITTEE CHARTER November, 2005  

E-Print Network [OSTI]

LASER SAFETY COMMITTEE CHARTER November, 2005 Function The Safety Review Committee (SRC) performs-committees to address specific health and safety matters. The Laser Safety Committee (LSC) is one of the SRC expert sub-committees. The Laser SafetyCommittee recommends policies and practices regarding the conduct and regulatory compliance

Knowles, David William

25

Dalhousie University Community Committee 1.) Membership changes  

E-Print Network [OSTI]

building (which we're in tonight) was delivered on time and under budget and we're applying for LEED gold. It is an addition to the LSC and is positioned next to the NRC. This will house Doug Wallace, the Canada Research

Brownstone, Rob

26

Cycling and Transit Green Buildings  

E-Print Network [OSTI]

solar thermal panels at the LSC. 2. Solar wall on the Mona Campbell Bld. 3. 80 solar Photovoltaic (PV) panels installed in front of a solar wall system on the roof of the Computer Science Bld. Water Green Buildings Renewable Energy 1. Solar Thermal and PV Panels are mounted on C Building for research

Lotze, Heike K.

27

Mulberry Street Laporte Avenue  

E-Print Network [OSTI]

Kiosk 路 Ram Copy 路 INTO Cafe 路 Expanded Grab & Go DINING SPACE Morgan Library - Morgan Grind 路 Expanded Grab & Go OFFICE/SERVICE SPACE Morgan Library 路 Ram Card, and Cashier's Office 路 Rooms 203, 175, and Front Counter 路 Expanded Grab & Go 路 Temporary Kiosk DINING SPACE LSC/Library Plaza 路 T-Lex Food Trailer

Stephens, Graeme L.

28

QUANTITATIVE STABILITY ANALYSIS OF STOCHASTIC ...  

E-Print Network [OSTI]

? is said to be lower semi-continuous (lsc for short) at 痻 ? X if and only if ..... It is also known as a distance of probability measures having ?-structure, see [45] ...... In order to compare the previous novel stability result for two-stage models ...... Quantitative stability in stochastic programming: The method of probability metrics...

2013-07-14T23:59:59.000Z

29

Test of the consistency of various linearized semiclassical initial value time correlation functions in application to inelastic neutron scattering  

E-Print Network [OSTI]

functions in application to inelastic neutron scattering from liquid para-hydrogen Jian Liua and William H for inelastic neutron scattering from liquid para-hydrogen at 14 K. Various time correlations functions were neutron scattering experimental data all suggest that the LSC-IVR is indeed a good short

Miller, William H.

30

Y.  

Office of Legacy Management (LM)

r:akc TTa2i O,Z l:sc&, Z?Ci ' 2 L) yo, ymy llscxj t&w t-icl,,:;13b:;.xn coxii:tic;n3.,. Thiz ezl.c:iscc ,; 3-A V&Y, * of oIridc Jo; the her; ;5 0.n v.Y' .::I 5 ti,...

31

ELECTRICAL & COMPUTER ENGINEERING  

E-Print Network [OSTI]

ELECTRICAL & COMPUTER ENGINEERING SEMINAR "Geometry as a Prior in Signal Processing" by Yuejie Chi Electrical Engineering Princeton University Monday, March 19, 2012, 11:00 a.m. Location LSC 210 Abstract processing. Biography: Yuejie Chi is a Ph.D. candidate in Electrical Engineering at Princeton University

32

Trade-off Analysis of Regenerative Power Source for Long Duration Loitering Airship  

E-Print Network [OSTI]

: photovoltaic flat panels, thin film photovoltaic panels, trough solar concentrators, Stirling dish solar by their excessive drag. Flat solar technologies (i.e. thin film, LSC, and flat panel PV) are ranked the highest, the airship needs a reliable, low-weight, renewable power generation system. This analysis is focused on solar

33

Surface Chemistry and Non-Stoichiometry of Nd2NiO4+ Epitaxial Thin Films with Different Orientation and Strain  

E-Print Network [OSTI]

of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA c high vacuum (below 10-8 mbar) and temperatures of up to 700o C. (100)- and (001)-oriented films strain can accelerate the oxygen surface exchange and diffusion kinetics in LSC thin films (11

Yildiz, Bilge

34

Determining the biomass fraction of mixed waste fuels: A comparison of existing industry and 14C-based methodologies  

Science Journals Connector (OSTI)

Abstract 14C analysis of flue gas by accelerator mass spectrometry (AMS) and liquid scintillation counting (LSC) were used to determine the biomass fraction of mixed waste at an operational energy-from-waste (EfW) plant. Results were converted to bioenergy (% total) using mathematical algorithms and assessed against existing industry methodologies which involve manual sorting and selective dissolution (SD) of feedstock. Simultaneous determinations using flue gas showed excellent agreement: 44.8牨2.7% for AMS and 44.6牨12.3% for LSC. Comparable bioenergy results were obtained using a feedstock manual sort procedure (41.4%), whilst a procedure based on selective dissolution of representative waste material is reported as 75.5% (no errors quoted). 14C techniques present significant advantages in data acquisition, precision and reliability for both electricity generator and industry regulator.

G.K.P. Muir; S. Hayward; B.G. Tripney; G.T. Cook; P. Naysmith; B.M.J. Herbert; M.H Garnett; M. Wilkinson

2014-01-01T23:59:59.000Z

35

Progress towards Gravitational Wave Astronomy  

E-Print Network [OSTI]

I will review the most recent and interesting results from gravitational wave detection experiments, concentrating on recent results from the LIGO Scientific Collaboration (LSC). I will outline the methodologies utilized in the searches, explain what can be said in the case of a null result, what quantities may be constrained. I will compare these results with prior expectations and discuss their significance. As I go along I will outline the prospects for future improvements.

M. Alessandra Papa

2008-02-07T23:59:59.000Z

36

Luminescent solar concentrators: From experimental validation of 3D ray-tracing simulations to coloured stained-glass windows for BIPV  

Science Journals Connector (OSTI)

Abstract Luminescent solar concentrators (LSC) are a promising technology for building integrated photovoltaics (BIPV) given the wide variety of forms and colours that can be realised. Given the flexibility of the technology, the use of ray-trace modelling is indispensable in the design, performance evaluation, and optimisation of LSCs. This work begins by comparing a three dimensional (3D) ray-trace model of an LSC with experimental results. The study includes 70 samples both square and circular LSCs, containing five different fluorescent organic dyes (BASF Lumogen) each at seven different concentrations. The figure-of-merit used for performance evaluation was the average power density determined at the LSC edge sheet, measured using an optical fibre connected to a spectrometer. The results demonstrate that 3D ray-trace results gives good agreement with the experimental measurements, to within around 5% within a wide concentration range (optical density=0.058) and a maximum difference of 13%. The wide range of colours achieved is presented in a CIE chart. Overall, the validated experimental results give confidence in the use of modelling for future larger \\{LSCs\\} for BIPV. Therefore, based on these results and the colours achievable, a model of a stained-glass window is constructed and its performance throughout a solar day is simulated.

A. Kerrouche; D.A. Hardy; D. Ross; B.S. Richards

2014-01-01T23:59:59.000Z

37

How Good Are Slicing Floorplans? F.Y. Young and D.F. Wong  

E-Print Network [OSTI]

module area, = q2Amax rAtotal and r 2 is the shape exibility of each module. Our result shows oorplan F of these rectangles such that area(F) minf(1+ 1 bprc) 5 4 (1+ )gAtotal where = q2Amax r the areas are small comparing with the total area, e.g. when r = 2 and Amax = Atotal 100 , the percentage

Young, Evangeline Fun Yu

38

Constrained Simulations of the Real Universe. II. Observational Signatures of Intergalactic Gas in the Local Supercluster Region  

Science Journals Connector (OSTI)

We present results of gasdynamics+N-body constrained cosmological simulations of the Local Supercluster region (LSC; about 30 h-1 Mpc around the Virgo cluster), which closely mimic the real universe within 100 Mpc, by imposing constraints from the MARK III catalog of galaxy peculiar velocities. The simulations are used to study the properties and possible observational signatures of intergalactic medium in the LSC region. We find that in agreement with previous unconstrained simulations, ?30% of the gas in this region is in the warm/hot phase at T ~ 105-107 K and ?40% in the diffuse phase at T 5 K in low-density regions. The X-ray emission from the warm/hot gas may represent a small (~5%-10%) but important contribution to the X-ray background observed by the ROSAT All-Sky Survey at energies around 1 keV. The best prospects for detection of the warm/hot intergalactic medium of the LSC located in filaments and in the vicinity of virialized regions of groups and clusters are through absorption in resonant lines of O VII and O VIII in soft X-rays and in the O VI doublet in UV. If intergalactic gas in filaments (?/? ~ 1-10) is enriched to typical metallicities of 0.05, the column densities of O VI, O VII, and O VIII along a random line of sight near the north Galactic pole, especially near the supergalactic plane, have a significant probability to be in the range detectable by current (FUSE, XMM) and future (Constellation-X) instruments.

Andrey V. Kravtsov; Anatoly Klypin; Yehuda Hoffman

2002-01-01T23:59:59.000Z

39

SoC Test Scheduling Using the B*-Tree Based Floorplanning Technique * Jen-Yi Wuu1  

E-Print Network [OSTI]

University, Taipei, Taiwan jywuu@eda.ee.ntu.edu.tw, tungchieh@ntu.edu.tw, ywchang@cc.ee.ntu.edu.tw Abstract effective and efficient---our method obtains the best results ever reported for SoC test scheduling

Chang, Yao-Wen

40

ANAIS: Status and prospects  

E-Print Network [OSTI]

ANAIS experiment will look for dark matter annual modulation with large mass of ultra-pure NaI(Tl) scintillators at the Canfranc Underground Laboratory (LSC), aiming to confirm the DAMA/LIBRA positive signal in a model-independent way. Two 12.5 kg each NaI(Tl) crystals provided by Alpha Spectra are currently taking data at the LSC. Present status of ANAIS detectors background and general performance is summarized; in particular, thanks to the high light collection efficiency prospects of lowering the threshold down to 1 keVee are reachable. Crystal radiopurity goals are fulfilled for $^{232}$Th and $^{238}$U chains and $^{40}$K activity, although higher than original goal, could be accepted; however, high $^{210}$Pb contamination out-of-equilibrium has been identified. More radiopure detectors are being built by Alpha Spectra. The ongoing high quantum efficiency PMT tests and muon veto characterization are also presented. Finally, the sensitivity of the experiment for the annual modulation in the WIMP signal,...

Amar, Julio; Cuesta, Clara; Garc韆, Eduardo; Ginestra, Carlos; Mart韓ez, Mar韆; Oliv醤, Miguel A; Ortigoza, Ysrael; de Sol髍zano, Alfonso Ort韟; Pobes, Carlos; Puimed髇, Jorge; Sarsa, Mar韆 Luisa; Villar, Jos 羘gel; Villar, Patricia

2015-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "lsc floorplan lsc" 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

Lowering the background level and the energy threshold of Micromegas x-ray detectors for axion searches  

E-Print Network [OSTI]

Axion helioscopes search for solar axions by their conversion in x-rays in the presence of high magnetic fields. The use of low background x-ray detectors is an essential component contributing to the sensitivity of these searches. In this work, we review the recent advances on Micromegas detectors used in the CERN Axion Solar Telescope (CAST) and proposed for the future International Axion Observatory (IAXO). The actual setup in CAST has achieved background levels below 10$^{-6}$ keV$^{-1}$ cm$^{-2}$ s$^{-1}$, a factor 100 lower than the first generation of Micromegas detectors. This reduction is based on active and passive shielding techniques, the selection of radiopure materials, offline discrimination techniques and the high granularity of the readout. We describe in detail the background model of the detector, based on its operation at CAST site and at the Canfranc Underground Laboratory (LSC), as well as on Geant4 simulations. The best levels currently achieved at LSC are low than 10$^{-7}$ keV$^{-1}$ ...

Iguaz, F J; Aznar, F; Castel, J F; Dafni, T; Davenport, M; Ferrer-Ribas, E; Galan, J; Garcia, J A; Garza, J G; Giomataris, I; Irastorza, I G; Papaevangelou, T; Rodriguez, A; Tomas, A; Vafeiadis, T; Yildiz, S C

2015-01-01T23:59:59.000Z

42

Lowering the background level and the energy threshold of Micromegas x-ray detectors for axion searches  

E-Print Network [OSTI]

Axion helioscopes search for solar axions by their conversion in x-rays in the presence of high magnetic fields. The use of low background x-ray detectors is an essential component contributing to the sensitivity of these searches. In this work, we review the recent advances on Micromegas detectors used in the CERN Axion Solar Telescope (CAST) and proposed for the future International Axion Observatory (IAXO). The actual setup in CAST has achieved background levels below 10$^{-6}$ keV$^{-1}$ cm$^{-2}$ s$^{-1}$, a factor 100 lower than the first generation of Micromegas detectors. This reduction is based on active and passive shielding techniques, the selection of radiopure materials, offline discrimination techniques and the high granularity of the readout. We describe in detail the background model of the detector, based on its operation at CAST site and at the Canfranc Underground Laboratory (LSC), as well as on Geant4 simulations. The best levels currently achieved at LSC are low than 10$^{-7}$ keV$^{-1}$ cm$^{-2}$ s$^{-1}$ and show good prospects for the application of this technology in IAXO. Finally, we present some ideas and results for reducing the energy threshold of these detectors below 1 keV, using high-transparent windows, autotrigger electronics and studying the cluster shape at different energies. As a high flux of axion-like-particles is expected in this energy range, a sub-keV threshold detector could enlarge the physics case of axion helioscopes.

F. J. Iguaz; S. Aune; F. Aznar; J. F. Castel; T. Dafni; M. Davenport; E. Ferrer-Ribas; J. Galan; J. A. Garcia; J. G. Garza; I. Giomataris; I. G. Irastorza; T. Papaevangelou; A. Rodriguez; A. Tomas; T. Vafeiadis; S. C. Yildiz

2015-01-07T23:59:59.000Z

43

Simulation Study of Current Drive Efficiency for KSTAR 5 GHz LHCD  

SciTech Connect (OSTI)

Theoretical 5 GHz lower hybrid current drive (LHCD) efficiency using power spectrum given by 0-D Brambilla code and Lower Hybrid Simulation Code (LSC) have been studied for KSTAR. In LSC simulation, RF-driven current and current drive efficiency has been found to be deeply dependent on the profiles of the plasma density and temperature as well as on current profile in order to obtain hollow current profile favorable for advance tokamak operation mode and steady state operation. The peaked density and broad temperature profile control has been found to be efficient in current drive with maximum RF-driven current larger than 400 kA/MW with very high efficiency when the peak plasma density is ranged from 0.2 to 2.0x1020 m-3, and the peak electron temperature range of 2-20 keV together with toroidal field 2-3.5 T and Ip = 0.5-2 MA. The on-/off-axis current profile controllability is also investigated through parametric scan, and small negative magnetic shear is seen at the narrow region of the off-axis for very high temperature regime and for high BT and I{sub p}. In order to achieve the same for lower temperature regime Ip has to be lower and also for higher LH-power compromising with CD efficiency in this case.

Aria, A. K.; Bae, Y. S.; Yang, H. L.; Kwon, M. [National Fusion Research Institute, Gwahangno 113, Yuseong-gu, Daejeon 305-333 (Korea, Republic of); Do, H. J.; Namkung, W.; Cho, M. H.; Park, H. [Pohang University of Science and Technology, San 31, Hyoja-dong, Nam-gu, Pohang 790-784 (Korea, Republic of)

2011-12-23T23:59:59.000Z

44

E-Print Network 3.0 - analogue fuzzy hardware Sample Search Results  

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

emission inventory neurofuzzy areacontrol class diagnosis identify tumor cubic energy micro... school flicker floorplan friction fusion graphics hardware harmonic highspeed...

45

Slide 1  

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

Jeff Kimball Jeff Kimball Technical Staff Defense Nuclear Facilities Safety Board (jeffreyk@dnfsb.gov) September 19, 2012 1 The views expressed are solely those of the author and no official support or endorsement of this presentation by the Defense Nuclear Facilities Safety Board or the federal government is intended or should be inferred. 飦 Department of Energy Approach to Natural Phenomena Hazards Analysis and Design (Seismic) 飦 Design Basis and Beyond Design Basis Seismic Events 飦 Seismic Risk Implications - Key Parameters and Insights 飦 Conclusions 2 DOE Approach to Seismic Design is Performance Based 3 Damage is Assessed Using Limit States (LS) * Elastic - no permanent deformation. {LS-D} * Fully Operational - limited permanent deformation but can perform function. {LS-C}

46

Data:094ee03b-0cb5-4458-b14a-848b16f0069f | Open Energy Information  

Open Energy Info (EERE)

0cb5-4458-b14a-848b16f0069f 0cb5-4458-b14a-848b16f0069f No revision has been approved for this page. It is currently under review by our subject matter experts. Jump to: navigation, search Loading... 1. Basic Information 2. Demand 3. Energy << Previous 1 2 3 Next >> Basic Information Utility name: Merced Irrigation District Effective date: 2010/01/01 End date if known: Rate name: SCHEDULE LSC-1 STREET LIGHTING - DISTRICT OWNED OR MAINTAINED-Sodium Vapor Lamp 200W Sector: Lighting Description: APPLICABILITY: This schedule is applicable to MID owned or maintained lighting installations which illuminate streets, highways and other public dedicated outdoor ways and places which generally utilize MID distribution facilities. Monthly Usage: 81kWh Source or reference: http://www.mercedid.org/index.cfm/power/energy-rulesfeesrates/electric-rates/

47

Conte Large Flume | Open Energy Information  

Open Energy Info (EERE)

Conte Large Flume Conte Large Flume Overseeing Organization United States Geological Survey, LSC Hydrodynamic Testing Facility Type Flume Length(m) 38.1 Beam(m) 6.1 Depth(m) 5.2 Cost(per day) Contact POC Towing Capabilities Towing Capabilities None Wavemaking Capabilities Wavemaking Capabilities None Channel/Tunnel/Flume Channel/Tunnel/Flume Yes Recirculating No Wind Capabilities Wind Capabilities None Control and Data Acquisition Description National Instruments LabView and other data acquisition systems Number of channels 12 Bandwidth(kHz) 44 Cameras Yes Number of Color Cameras 5 Description of Camera Types Conventional underwater video, 4; high speed (1000 fps), 1 Available Sensors Displacement, Flow, Pressure Range(psi), Thermal, Turbulence, Velocity Data Generation Capability

48

Category:Testing Facility Operators | Open Energy Information  

Open Energy Info (EERE)

Facility Operators Facility Operators Jump to: navigation, search This category contains facilities for research on renewable technologies and uses the form Testing Facility Operator. Pages in category "Testing Facility Operators" The following 26 pages are in this category, out of 26 total. A Alden Research Laboratory, Inc B Bucknell University C Colorado State University Hydrodynamics Cornell University Hydrodynamics M Massachusetts Institute of Technology Hydrodynamics O Ohmsett Oregon State University Hydrodynamics P Pennsylvania State University Hydrodynamics S Sandia National Laboratories Hydrodynamics S cont. Stevens Institute of Technology T Texas A&M (Haynes) Texas A&M (OTRC) U United States Army Corp of Engineers (ERDC) United States Geological Survey, HIF United States Geological Survey, LSC

49

Conte Small Flume | Open Energy Information  

Open Energy Info (EERE)

Small Flume Small Flume Overseeing Organization United States Geological Survey, LSC Hydrodynamic Testing Facility Type Flume Length(m) 38.1 Beam(m) 3.0 Depth(m) 5.2 Cost(per day) Contact POC Towing Capabilities Towing Capabilities None Wavemaking Capabilities Wavemaking Capabilities None Channel/Tunnel/Flume Channel/Tunnel/Flume Yes Recirculating No Wind Capabilities Wind Capabilities None Control and Data Acquisition Description National Instruments LabView and other data acquisition systems Number of channels 12 Bandwidth(kHz) 44 Cameras Yes Number of Color Cameras 5 Description of Camera Types Conventional underwater video, 4; high speed (1000 fps), 1 Available Sensors Displacement, Flow, Pressure Range(psi), Thermal, Turbulence, Velocity Data Generation Capability

50

A shipping plan for bulk petroleum products by sea-going tankers  

E-Print Network [OSTI]

(. 01; 1 ?I 0 st '. ii i 0 '. 0 i. gbt 01 uolltc e 0 1!i 1(!i Ly has 1&ci il (' !( !tlst ccl SL sotto po inL in i t s cr&!it 0) I&1 0 I, . P. 'I&(obl &i& iS ii(I jt!' Lcd . . ' 'g t(1011 'Oiuc, thc' pcoilp, 1 ti( Lh so(le 1&(& 1 ! (Pl!it c&i, 'll.... (gy us inc t&&o d I?! ts, ny nc &bcr up Lo &nd 1?eluding 1295 ccn be rcprcuc?Lcd in L&sc 36. ) The. ro&& n; &&c XJPj jpn spccii I&. s I h&t all Lh &uutri &. - in i his ro&& coL'respond co Lhe n r& quir -mont for: product p ?t dc; I inai &ou jj (base...

Boyd, David George

2012-06-07T23:59:59.000Z

51

Oxidation of sewage supernatant liquor by trickling filtration  

E-Print Network [OSTI]

tQ C?P?SSS SSQCS18 SPPXSQ'LSC9QQ XCC' ChS SSS1SCSQCS 4041 F4~ ISQSXVS6 KTCIIS 11QCQSSQ?S 8 S SQgX04I CQSECICSQ C94@X63SQ, gga4~g&SX Sod ~Cggaaieni Cages'S QS ISNESS'. 'Bg, t, Q?A, SC@ES1, . I Q' 5 I I glndgs digoseion tank snpsensennt ligose... tiie settled solids, & tbs-so~teston tank vithont pmdsoing- ssptio ( %is enisle. , contest of: chs. sledge, teen@id . ftoa-- chs sedisejcation, . tsnb 'dixeetlp, ass mfa cd tejsited scoiegs osiIeoicg; ef. ; icbj "s1ndge 'di " ' gsstioit' ~ ' Sie...

Styner, Pete

2012-06-07T23:59:59.000Z

52

OXYGEN TRANSPORT CERAMIC MEMBRANES  

SciTech Connect (OSTI)

In the present quarter, experiments are presented on ceramic/metal interactions of Zirconia/Ni-B-Si system and with a thin Ti coating deposited on zirconia surface. Processing of perovskites of LSC, LSF and LSCF composition for evaluation of mechanical properties as a function of environment are begun. The studies are to be in parallel with LSFCO composition to characterize the segregation of cations and slow crack growth in environmental conditions. La{sub 1-x}Sr{sub x}FeO{sub 3-d} has also been characterized for paramagnetic ordering at room temperature and the evolution of magnetic moments as a function of temperature are investigated. Investigation on the thermodynamic properties of the membrane materials are continued to develop a complete model for the membrane transport.

Dr. Sukumar Bandopadhyay; Dr. Nagendra Nagabhushana

2003-01-01T23:59:59.000Z

53

Characterization of Atomic and Electronic Structures of Electrochemically Active SOFC Cathode Surfaces  

SciTech Connect (OSTI)

The objective of this project is to gain a fundamental understanding of the oxygen-reduction mechanism on mixed conducting cathode materials by means of quantum-chemical calculations coupled with direct experimental measurements, such as vibrational spectroscopy. We have made progress in the elucidation of the mechanisms of oxygen reduction of perovkite-type cathode materials for SOFCs using these quantum chemical calculations. We established computational framework for predicting properties such as oxygen diffusivity and reaction rate constants for adsorption, incorporation, and TPB reactions, and formulated predictions for LSM- and LSC-based cathode materials. We have also further developed Raman spectroscopy as well as SERS as a characterization tool for SOFC cathode materials. Raman spectroscopy was used to detect chemical changes in the cathode from operation conditions, and SERS was used to probe for pertinent adsorbed species in oxygen reduction. However, much work on the subject of unraveling oxygen reduction for SOFC cathodes remains to be done.

Kevin Blinn; Yongman Choi; Meilin Liu

2009-08-11T23:59:59.000Z

54

The NEXT experiment: A high pressure xenon gas TPC for neutrinoless double beta decay searches  

E-Print Network [OSTI]

Neutrinoless double beta decay is a hypothetical, very slow nuclear transition in which two neutrons undergo beta decay simultaneously and without the emission of neutrinos. The importance of this process goes beyond its intrinsic interest: an unambiguous observation would establish a Majorana nature for the neutrino and prove the violation of lepton number. NEXT is a new experiment to search for neutrinoless double beta decay using a radiopure high-pressure xenon gas TPC, filled with 100 kg of Xe enriched in Xe-136. NEXT will be the first large high-pressure gas TPC to use electroluminescence readout with SOFT (Separated, Optimized FuncTions) technology. The design consists in asymmetric TPC, with photomultipliers behind a transparent cathode and position-sensitive light pixels behind the anode. The experiment is approved to start data taking at the Laboratorio Subterr\\'aneo de Canfranc (LSC), Spain, in 2014.

D. Lorca; J. Mart韓-Albo; F. Monrabal; for the NEXT Collaboration

2012-10-15T23:59:59.000Z

55

STAG UK Newsletter Issue 3  

E-Print Network [OSTI]

al C01..1.litC.uvnl. ll L.irL:. uGo!J:putsr, t~liG is CnptlxLn JDllCB .,~irk ~Jf t~lC: uGG Lntcrpr-lsc ? .c)oe,in thirty SGC0YlU c,Ju(ltclo't,m.Cocio zoro~ zoro ?'oro,duGtruct zoro. 1! COL?p. 11'lll1.irty :J(. CUllI.1Bo ?? 00 ??? 1 Ki~$pock .? Ki...,lor tho bonofi t of our over scc,s ~,:.()r.ibvrs9 BooD is Dri tish DrvadcuBtinL Corporo.tion? affcctiolllcltcly l:no\\,Til as "Auntyl! ,'Tholl sJ.J.c? D been Lood. Thln~,s nrc looking v.p for tho club! ll.t tllC last count'lHc had. 43 Ueu()crs 1r.:.nc1...

56

Generation of gaseous tritium standards  

SciTech Connect (OSTI)

The determination of aqueous and non-aqueous tritium in gaseous samples is one type of determination often requested of radioanalytical laboratories. This determination can be made by introducing the sample as a gas into a sampling train containing two silica gel beds separated by.a catalytic oxidizer bed. The first bed traps tritiated water. The sample then passes into and through the oxidizer bed where non-aqueous tritium containing species are oxidized to water and other products of combustion. The second silica gel bed then traps the newly formed tritiated water. Subsequently, silica gel is removed to plastic bottles, deionized water is added, and the mixture is permitted to equilibrate. The tritium content of the equilibrium mixture is then determined by conventional liquid scintillation counting (LSC). For many years, the moisture content of inert, gaseous samples has been determined using monitors which quantitatively electrolyze the moisture present after that moisture has been absorbed by phosphorous pentoxide or other absorbents. The electrochemical reaction is quantitative and definitive, and the energy consumed during electrolysis forms the basis of the continuous display of the moisture present. This report discusses the experimental evaluation of such a monitor as the basis for a technique for conversion of small quantities of SRMs of tritiated water ({sup 3}HOH) into gaseous tritium standards ({sup 3}HH).

Hohorst, F.A.

1994-09-01T23:59:59.000Z

57

Laser Electron Gamma Source: Biennial progress report, June 1996  

SciTech Connect (OSTI)

The LEGS facility provides intense, polarized, monochromatic {gamma}-ray beams by Compton backscattering laser light from relativistic electrons circulating in the X-Ray storage ring of the National Synchrotron Light Source at Brookhaven national Laboratory. Since 1990, experiments have concentrated on single polarization observables (polarized beams on unpolarized targets) in nuclear reactions involving the {Delta} resonance. Highlights of the last two years are given. An updated status of LEGS, and recent publications, is available on the WWW via http://WWW.LEGS.BNL.GOV/{approximately}LEGS/. In 1997 a new phase of operations will begin, focusing on double-polarization measurements with circularly polarized photon beams and longitudinally polarized nucleon targets. This work requires the development of (i) a new frozen-spin hydrogen-deuteride target that provides high polarizations for both nuclear species, and (ii) a new large acceptance detector array for measuring total reaction cross sections in both neutral and charged-particle channels. Progress on these instrumentation developments is an ongoing effort of the LEGS Spin Collaboration (LSC) and is discussed in the last section of this report.

Sandorfi, A.M. [ed.

1996-09-01T23:59:59.000Z

58

Testing of a coal-fired diesel power plant  

SciTech Connect (OSTI)

The POC coal-fired power plant consists of a Cooper-Bessemer LSC-6 engine (15.5 inch bore, 22 inch stroke) rated at 400 rev/min and 208 psi bmep producing approximately 1.8 MW of power. The power plant is fueled with 'engine grade' coal slurry which has been physically cleaned to an ash level of approximately 1.5 to 2% (dry basis) and has a mean particle size of approximately 12 micron. CWS is injected directly into the combustion chamber through a fuel injector (one per cylinder) which was designed and developed to be compatible with the fuel. Each injector is fitted with a 19 orifice nozzle tip made with sapphire inserts in each orifice. The combustion chambers are fitted with twin diesel pilot injectors which provide a positive ignition source and substantially shorten the ignition delay period of the CWS fuel. Durable coatings (typically tungsten carbide) are used for the piston rings and cylinder liners to reduce wear rates. The emission control system consists of SCR for NO[sub x] control, sodium sorbent injection for SO[sub x] control, and a cyclone plus baghouse for particulate capture. The cyclone is installed upstream of the engine turbocharger which helps protect the turbine blades.

Wilson, R.P.; Balles, E.N.; Benedek, K.R.; Benson, C.E. (Little (Arthur D.), Inc., Cambridge, MA (United States)); Rao, K.; Schaub, F. (Cooper-Bessemer, Mount Vernon, OH (United States)); Kimberley, J. (AMBAC, West Springfield, MA (United States)); Itse, D. (PSI Technology Co., Andover, MA (United States))

1993-01-01T23:59:59.000Z

59

Testing of a coal-fired diesel power plant  

SciTech Connect (OSTI)

The POC coal-fired power plant consists of a Cooper-Bessemer LSC-6 engine (15.5 inch bore, 22 inch stroke) rated at 400 rev/min and 208 psi bmep producing approximately 1.8 MW of power. The power plant is fueled with `engine grade` coal slurry which has been physically cleaned to an ash level of approximately 1.5 to 2% (dry basis) and has a mean particle size of approximately 12 micron. CWS is injected directly into the combustion chamber through a fuel injector (one per cylinder) which was designed and developed to be compatible with the fuel. Each injector is fitted with a 19 orifice nozzle tip made with sapphire inserts in each orifice. The combustion chambers are fitted with twin diesel pilot injectors which provide a positive ignition source and substantially shorten the ignition delay period of the CWS fuel. Durable coatings (typically tungsten carbide) are used for the piston rings and cylinder liners to reduce wear rates. The emission control system consists of SCR for NO{sub x} control, sodium sorbent injection for SO{sub x} control, and a cyclone plus baghouse for particulate capture. The cyclone is installed upstream of the engine turbocharger which helps protect the turbine blades.

Wilson, R.P.; Balles, E.N.; Benedek, K.R.; Benson, C.E. [Little (Arthur D.), Inc., Cambridge, MA (United States); Rao, K.; Schaub, F. [Cooper-Bessemer, Mount Vernon, OH (United States); Kimberley, J. [AMBAC, West Springfield, MA (United States); Itse, D. [PSI Technology Co., Andover, MA (United States)

1993-01-01T23:59:59.000Z

60

Quantitative contribution of resistance sources of components to stack performance for planar solid oxide fuel cells  

Science Journals Connector (OSTI)

Abstract This study detects the resistance that influences the stack performance of \\{SOFCs\\} with composition of Ni-YSZ/YSZ/LSC-YSZ and investigates the variation patterns of the resistances of the stack repeating unit (SRU) during operation and their quantitative contributions to its performance at 700牥C, 750牥C and 800牥C. The results indicate that when the cell cathode contacts the interconnect well, the cell resistance accounts for 70.179.7% of that of the SRU, and the contact resistance (CR) between the cathode current-collecting layer (CCCL) and the interconnect accounts for 20.028.9%. The CR between the anode current-collecting layer (ACCL) and the interconnect together with the resistance of the interconnect can be neglected during instantaneous I朧 testing. When the stack is discharged at constant current for 600爃, cell resistance increases by 28.3%, accounting for 93.3% of the SRU degradation, the anodic CR increases by 36.4%, accounting for 6.7% of the SRU degradation, and the resistances of the cathode contact and its neighbor interconnect remain unchanged. Therefore, the increase of the cell resistance is the main reason causing the SRU degradation, and the anodic contact is also an influencing factor that cannot be neglected during stable operation.

Le Jin; Wanbing Guan; Xiao Ma; Huijuan Zhai; Wei Guo Wang

2014-01-01T23:59:59.000Z

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61

Mitigation Plans for the Microbunching-Instability-Related COTR at ASTA/FNAL  

SciTech Connect (OSTI)

At the Advanced Superconducting Test Accelerator (ASTA) now under construction at Fermilab, we anticipate the appearance of the microbunching instability related to the longitudinal space charge (LSC) impedances. With a photoinjector source and up to two chicane compressors planned, the conditions should result in the shift of some microbunched features into the visible light regime. The presence of longitudinal microstructures (microbunching) in the electron beam or the leading edge spikes can result in strong, spatially localized coherent enhancements of optical transition radiation (COTR) that mask the actual beam profile. Several efforts on mitigation of the effects in the diagnostics task have been identified. At ASTA we have designed the beam profiling stations to have mitigation features based on spectral filtering, scintillator choice, and the timing of the trigger to the digital camera's CCD chip. Since the COTR is more intense in the NIR than UV we have selectable bandpass filters centered at 420 nm which also overlap the spectral emissions of the LYSO:Ce scintillators. By delaying the CCD trigger timing of the integration window by 40-50 ns, we can reject the prompt OTR signal and integrate on the delayed scintillator light predominately. This combination of options should allow mitigation of COTR enhancements of order 100-1000 in the distribution.

Lumpkin, A. H.; Johnson, A. M.

2013-05-01T23:59:59.000Z

62

Design and characterization of the SiPM tracking system of the NEXT-100 demonstrator  

E-Print Network [OSTI]

NEXT-100 is a new experiment to search for neutrinoless double-beta decay of the Xe-136 isotope using a TPC filled with a 100 kg of high-pressure gaseous xenon with 90% isotopic enrichment. The experiment will take place at the Laboratorio Subterr\\'aneo de Canfranc (LSC), Spain. NEXT-100 uses electroluminescence (EL) technology for high energy resolution measurements. The gaseous xenon in the TPC allows additionally to record the tracks of the two beta particles, expected to have up to 30 cm length at 10 bar pressure. A full 3D sampling of the space points along the event tracks, using an optical readout system of the EL light, enables the identification of the double-beta events by means of a pattern recognition algorithm. In this paper, the SiPM-based tracking concept of NEXT-100 and its implementation in the demonstrator prototype NEXT-DEMO are presented. The characterization of the SiPM system and its readout electronics are described and shown to meet the experiment's requirements for the optimal recordi...

羖varez, V; Borges, F I G M; C醨cel, S; Carmona, J M; Castel, J; Catal, J M; Cebri醤, S; Cervera, A; Chan, D; Conde, C A N; Dafni, T; Dias, T H V T; D韆z, J; Egorov, M; Esteve, R; Evtoukhovitch, P; Fernandes, L M P; Ferrario, P; Ferreira, A L; Ferrer-Ribas, E; Freitas, E D C; Garcia, A N C; Gehman, V M; Gil, A; Giomataris, I; Goldschmidt, A; G髆ez, H; G髆ez-Cadenas, J J; Gonz醠ez, K; Gonz醠ez-D韆z, D; Guti閞rez, R M; Hauptman, J; Morata, J A Hernando; Herrera, D C; Herrero, V; Iguaz, F J; Irastorza, I G; Kalinnikov, V; Kiang, D; Labarga, L; Liubarsky, I; Lopes, J A M; Lorca, D; Losada, M; Luz髇, G; Mar, A; Mart韓-Albo, J; Mart韓ez, A; Miller, T; Moiseenko, A; Monrabal, F; Monteiro, C M B; Monz, J M; Mora, F J; Moutinho, L M; Vidal, J Mu駉z; da Luz, H Natal; Navarro, G; Nebot, M; Nygren, D; Oliveira, C A B; Palma, R; P閞ez, J; Aparicio, J L P閞ez; Renner, J; Ripoll, L; Rodr韌uez, A; Rodr韌uez, J; Santos, F P; Santos, J M F dos; Segui, L; Serra, L; Shuman, D; Sofka, C; Sorel, M; Toledo, J F; Tom醩, A; Torrent, J; Tsamalaidze, Z; V醶quez, D; Velicheva, E; Veloso, J F C A; Villar, J A; Webb, R C; Weber, T; White, J; Yahlali, N

2012-01-01T23:59:59.000Z

63

Lower Hybrid Heating and Current Drive on the Alcator C-Mod Tokamak  

SciTech Connect (OSTI)

On the Alcator C-Mod tokamak, lower hybrid current drive (LHCD) is being used to modify the current profile with the aim of obtaining advanced tokamak (AT) performance in plasmas with parameters similar to those that would be required on ITER. To date, power levels in excess of 1 MW at a frequency of 4.6 GHz have been coupled into a variety of plasmas. Experiments have established that LHCD on C-Mod behaves globally as predicted by theory. Bulk current drive efficiencies, n20IlhR/Plh ~ 0.25, inferred from magnetics and MSE are in line with theory. Quantitative comparisons between local measurements, MSE, ECE and hard x-ray bremsstrahlung, and theory/simulation using the GENRAY, TORIC-LH CQL3D and TSC-LSC codes have been performed. These comparisons have demonstrated the off-axis localization of the current drive, its magnitude and location dependence on the launched n|| spectrum, and the use of LHCD during the current ramp to save volt-seconds and delay the peaking of the current profile. Broadening of the x-ray emission profile during ICRF heating indicates that the current drive location can be controlled by the electron temperature, as expected. In addition, an alteration in the plasma toroidal rotation profile during LHCD has been observed with a significant rotation in the counter current direction. Notably, the rotation is accompanied by peaking of the density and temperature profiles on a current diffusion time scale inside of the half radius where the LH absorption is taking place.

R. Wilson, R. Parker, M. Bitter, P.T. Bonoli, C. Fiore, R.W. Harvey, K. Hill, A.E. Hubbard, J.W. Hughes, A. Ince-Cushman, C. Kessel, J.S. Ko, O. Meneghini, C.K. Phillips, M. Porkolab, J. Rice, A.E. Schmidt, S. Scott,S. Shiraiwa, E. Valeo, G.Wallace, J.C. Wright and the Alcator C-Mod Team

2009-11-20T23:59:59.000Z

64

Determining the ecological viability of constructed wetlands for the treatment of oil sands wastewater  

SciTech Connect (OSTI)

To determine the conditions for optimal degradation of naphthenic acids (C{sub n}H{sub 2n+z}O{sub 2}), the most toxic component of oil sands wastewater, the authors have monitored the mineralization of 2 representative naphthenic acids (NA), U-{sup 14}C-palmitic acid (linear, Z = 0) and 8-{sup 14}C-decahydro-2-naphthoic acid (bicyclic, Z = {minus}4) under varying conditions of temperature, phosphate and oxygen. The radiolabeled NA was added to biometer flasks containing wastewater {+-} amendments and evolved {sup 14}C-CO{sub 2} was trapped in a side arm and counted by LSC. The results indicate that low temperature (5 C) and anaerobiasis greatly inhibited NA degradation over the four week incubation period. Addition of phosphate (as buffered KP{sub i}) significantly increased {sup 14}C-CO{sub 2} production for both Z = 0 and Z = {minus}4 compounds; however, the subsequent high microbial growth rates also decreased PO{sub 2} which limited NA mineralization. Effluent toxicity was monitored at week 0 and week 4 using Microtox and fathead minnow tests. Although there was increased survival of fathead minnows in the phosphate-amended effluent, the IC{sub 20} values of the Microtox assay showed no improvement in either the phosphate-treated or untreated effluents. These results show that naphthenic acid analogues are readily degraded by indigenous microorganisms in oil sands wastewater and that phosphate addition accelerated the mineralization of these compounds if PO{sub 2} remained high.

Lai, J.; Kiehlmann, E.; Pinto, L.; Bendell-Young, L.; Moore, M. [Simon Fraser Univ., Burnaby, British Columbia (Canada); Nix, P. [EVS Environment Consultants, North Vancouver, British Columbia (Canada)

1995-12-31T23:59:59.000Z

65

The NEXT experiment  

E-Print Network [OSTI]

NEXT (Neutrino Experiment with a Xenon TPC) is an experiment to search neutrinoless double beta decay processes (bb0nu) in Xe136. The NEXT technology is based in the use of time projection chambers operating at a typical pressure of 15 bar and using electroluminescence to amplify the signal (HPXE). The main advantages of the experimental technique are: a) excellent energy resolution; b) the ability to reconstruct the trajectory of the two electrons emitted in the decays, which further contributes to the suppression of backgrounds; c) scalability to large masses; and d) the possibility to reduce the background to negligible levels thanks to the barium tagging technology (BATA). The NEXT roadmap was designed in four stages: i) Demonstration of the HPXE technology with prototypes deploying a mass of natural xenon in the range of 1 kg, using the NEXT-DEMO (IFIC) and NEXT-DBDM (Berkeley) prototypes; ii) Characterisation of the backgrounds to the bb0nu signal and measurement of the bb2nu signal with the NEW detector, deploying 10 kg of enriched xenon and operating at the LSC; iii) Search for bb0nu decays with the NEXT-100 detector, which deploys 100 kg of enriched xenon; iv) Search for bb0nu decays with the BEXT detector, which will deploy masses in the range of the ton and will introduce two additional handles, only possible in a HPXE: a) A magnetic field, capable of further enhancing the topological signal of NEXT; and b) barium-tagging (a technique pioneered by the EXO experiment which is also accessible to NEXT).

Juan Jose Gomez-Cadenas

2014-11-10T23:59:59.000Z

66

Chancellor Water Colloids: Characterization and Radionuclide Association  

SciTech Connect (OSTI)

Concluding remarks about this paper are: (1) Gravitational settling, zeta potential, and ultrafiltration data indicate the existence of a colloidal phase of both the alpha and beta emitters in the Chancellor water; (2) The low activity combined with high dispersion homogeneity of the Chancellor water indicate that both alpha and beta emitters are not intrinsic colloids; (3) Radionuclides in the Chancellor water, particularly Pu, coexist as dissolved aqueous and sorbed phases - in other words the radionuclides are partitioned between the aqueous phase and the colloidal phase; (4) The presence of Pu as a dissolved species in the aqueous phase, suggests the possibility of Pu in the (V) oxidation state - this conclusion is supported by the similarity of the k{sub d} value of Pu determined in the current study to that determined for Pu(V) sorbed onto smectite colloids, and the similar electrokinetic behavior of the Chancellor water colloids to smectite colloids; (5) About 50% of the Pu(V) is in the aqueous phase and 50% is sorbed on colloids (mass concentration of colloids in the Chancellor water is 0.12 g/L); (6) The k{sub d} of the Pu and the beta emitters (fission products) between aqueous and colloidal phases in the Chancellor water is {approx}8.0 x 10{sup 3} mL/g using two different activity measurement techniques (LSC and alpha spectroscopy); (7) The gravitational settling and size distributions of the association colloids indicate that the properties (at least the physical ones) of the colloids to which the alpha emitters are associated with seem to be different that the properties of the colloids to which the beta emitters are associated with - the beta emitters are associated with very small particles ({approx}50 - 120 nm), while the alpha emitters are associated with relatively larger particles; and (8) The Chancellor water colloids are extremely stable under the natural pH and ionic strength conditions, indicating high potential for transport in the subsurface.

Abdel-Fattah, Amr I. [Los Alamos National Laboratory

2012-06-18T23:59:59.000Z

67

Oxygen Transport Ceramic Membranes  

SciTech Connect (OSTI)

In the present quarter, experiments are presented on ceramic/metal interactions of Zirconia/ Ni-B-Si system and with a thin Ti coating deposited on zirconia surface. Existing facilities were modified for evaluation of environmental assisted slow crack growth and creep in flexural mode. Processing of perovskites of LSC, LSF and LSCF composition were continued for evaluation of mechanical properties as a function of environment. These studies in parallel to those on the LSFCO composition is expect to yield important information on questions such as the role of cation segregation and the stability of the perovskite structure on crack initiation vs. crack growth. Studies have been continued on the La{sub 1-x}Sr{sub x}FeO{sub 3-d} composition using neutron diffraction and TGA studies. A transition from p-type to n-type of conductor was observed at relative low pO{sub 2}, at which the majority carriers changed from the holes to electrons because of the valence state decreases in Fe due to the further loss of oxygen. Investigation on the thermodynamic properties of the membrane materials are continued to develop a complete model for the membrane transport. Data obtained at 850 C show that the stoichiometry in La{sub 0.2}Sr{sub 0.8}Fe{sub 0.8}Cr{sub 0.2}O{sub 3-x} vary from {approx}2.85 to 2.6 over the pressure range studied. From the stoichiometry a lower limit of 2.6 corresponding to the reduction of all Fe{sup 4+} to Fe{sup 3+} and no reduction of Cr{sup 3+} is expected.

S. Bandopadhyay; N. Nagabhushana

2003-08-07T23:59:59.000Z

68

Upper and lower limits on the Crab pulsar's astrophysical parameters set from gravitational wave observations by LIGO: braking index and energy considerations  

E-Print Network [OSTI]

The Laser Interferometer Gravitational Observatory (LIGO) has recently reached the end of its fifth science run (S5), having collected more than a year worth of data. Analysis of the data is still ongoing but a positive detection of gravitational waves, while possible, is not realistically expected for most likely sources. This is particularly true for what concerns gravitational waves from known pulsars. In fact, even under the most optimistic (and not very realistic) assumption that all the pulsar's observed spin-down is due to gravitational waves, the gravitational wave strain at earth from all the known isolated pulsars (with the only notable exception of the Crab pulsar) would not be strong enough to be detectable by existing detectors. By August 2006, LIGO had produced enough data for a coherent integration capable to extract signal from noise that was weaker than the one expected from the Crab pulsar's spin-down limit. No signal was detected, but beating the spin-down limit is a considerable achievement for the LIGO Scientific Collaboration (LSC). It is customary to translate the upper limit on strain from a pulsar into a more astrophysically significant upper limit on ellipticity. Once the spin-down limit has been beaten, it is possible to release the constraint that all the spin-down is due to gravitational wave emission. A more complete model with diverse braking mechanisms can be used to set limits on several astrophysical parameters of the pulsar. This paper shows possible values of such parameters for the Crab pulsar given the current limit on gravitational waves from this neutron star.

Giovanni Santostasi

2008-07-16T23:59:59.000Z

69

The Concentration Of Tritium In Urine And Internal Radiation Dose Estimation Of PTNBR Radiation Workers  

SciTech Connect (OSTI)

The operation of Triga 2000 reactor in Nuclear Technology Center for Materials and Radiometry (PTNBR BATAN) normally produce tritium radionuclide which is the activation product of deuterium atom in reactor primary cooling water. According to previous monitoring, tritium was detected with the concentration of 8.236{+-}0.677 kBq/L and 1.704{+-}0.046 Bq/L in the primary cooling water and in reactor hall air, respectively. The tritium in reactor hall air chronically can be inhaled by the workers. In this research, tritium content in radiation workers' urine was determined to estimate the internal radiation doses received by the workers. About 50-100 mL of urine samples were collected from 48 PTNBR workers that is classified as 24 radiation workers and 24 administration staffs as a control. Urine samples of 25 mL were then prepared by active charcoal and KMnO{sub 4} addition and followed with complete distillation. The 2 mL of distillate was added with 13 mL scintillator, shaked vigorously and remained in cool and dark condition for about 24 hours. The tritium in the samples was then measured using liquid scintillation counter (LSC) for 1 hour. From the measurement results it was obtained that the tritium concentration in the urine of radiation workers were in the range of not detected and 5.191 Bq/mL, whereas in the administration staffs the concentration were between not detected and 4.607 Bq/mL. Internally radiation doses were calculated using the tritium concentration data, and it was found the averages about 0.602 {mu}Sv/year and 0.532 {mu}Sv/year for radiation workers and administration staffs, respectively. The doses received by the workers were lower than that of the permissible doses from tritium, i.e. 40 {mu}Sv/year.

Tjahaja, Poppy Intan; Sukmabuana, Putu; Aisyah, Neneng Nur [PTNBR BATAN, Jl. Tamansari no. 71, Bandung 40132 (Indonesia)

2010-12-23T23:59:59.000Z

70

Buffer Repeaters April 20, 1998 1 Buffer Repeaters  

E-Print Network [OSTI]

not be immediately under the best wire route. Thus, longer wires are required to reach the gas stations. To deal input capacitance and higher output drive. This reduces the number of gas stations and extra routing are required. For floorplanning reasons, repeaters tend to be grouped into "gas sta- tions" which may

Harris, David Money

71

Columbia University Libraries Preservation & Digital Conversion Division  

E-Print Network [OSTI]

12 B. COATED STOCK ("GLOSSY PAPER") 12 C. HANDLING SPECIFIC MEDIA 1. Bound Books and Periodicals 13 2. Emergency Contact List 23 B. Disaster Supply Item Request Form 25 C. Unit Priority Statement 26 D. Floorplan A VOICE MAIL MESSAGE! KEEP DIALING UNTIL YOU SPEAK TO SOMEONE! 854-5757 854-3580 854-2223 854-5892 854

Salzman, Daniel

72

The development of potassium tantalate niobate thin films for satellite-based pyroelectric detectors  

SciTech Connect (OSTI)

Potassium tantalate niobate (KTN) pyroelectric detectors are expected to provide detectivities, of 3.7 x 10{sup 11} cmHz {sup {1/2}}W{sup {minus}1} for satellite-based infrared detection at 90 K. The background limited detectivity for a room-temperature thermal detector is 1.8 x 10{sup 10} cmHz{sup {1/2}}W{sup {minus}1}. KTN is a unique ferroelectric for this application because of the ability to tailor the temperature of its pyroelectric response by adjusting its ratio of tantalum to niobium. The ability to fabricate high quality KTN thin films on Si-based substrates is crucial to the development of KTN pyroelectric detectors. Si{sub x}N{sub y} membranes created on the Si substrate will provide the weak thermal link necessary to reach background limited detectivities. The device dimensions obtainable by thin film processing are expected to increase the ferroelectric response by 20 times over bulk fabricated KTN detectors. In addition, microfabrication techniques allow for easier array development. This is the first reported attempt at growth of KTN films on Si-based substrates. Pure phase perovskite films were grown by pulsed laser deposition on SrRuO{sub 3}/Pt/Ti/Si{sub x}N{sub y}/Si and SrRuO{sub 3}/Si{sub x}N{sub y}/Si structures; room temperature dielectric permittivities for the KTN films were 290 and 2.5, respectively. The dielectric permittivity for bulk grown, single crystal KTN is {approximately}380. In addition to depressed dielectric permittivities, no ferroelectric hysteresis was found between 80 and 300 K for either structure. RBS, AES, TEM and multi-frequency dielectric measurements were used to investigate the origin of this apparent lack of ferroelectricity. Other issues addressed by this dissertation include: the role of oxygen and target density during pulsed laser deposition of KTN thin films; the use of YBCO, LSC and Pt as direct contact bottom electrodes to the KTN films, and the adhesion of the bottom electrode layers to Si{sub x}N{sub y}/Si.

Cherry, H.B.B. [Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Mineral Engineering]|[Lawrence Berkeley National Lab., CA (United States)

1997-05-01T23:59:59.000Z

73

Critical Causes of Degradation in Integrated Laboratory Scale Cells during High Temperature Electrolysis  

SciTech Connect (OSTI)

An ongoing project at Idaho National Laboratory involves generating hydrogen from steam using solid oxide electrolysis cells (SOEC). This report describes background information about SOECs, the Integrated Laboratory Scale (ILS) testing of solid-oxide electrolysis stacks, ILS performance degradation, and post-test examination of SOECs by various researchers. The ILS test was a 720- cell, three-module test comprised of 12 stacks of 60 cells each. A peak H2 production rate of 5.7 Nm3/hr was achieved. Initially, the module area-specific resistance ranged from 1.25 Ocm2 to just over 2 Ocm2. Total H2 production rate decreased from 5.7 Nm3/hr to a steady state value of 0.7 Nm3/hr. The decrease was primarily due to cell degradation. Post test examination by Ceramatec showed that the hydrogen electrode appeared to be in good condition. The oxygen evolution electrode does show delamination in operation and an apparent foreign layer deposited at the electrolyte interface. Post test examination by Argonne National Laboratory showed that the O2-electrode delaminated from the electrolyte near the edge. One possible reason for this delamination is excessive pressure buildup with high O2 flow in the over-sintered region. According to post test examination at the Massachusetts Institute of Technology, the electrochemical reactions have been recognized as one of the prevalent causes of their degradation. Specifically, two important degradation mechanisms were examined: (1) transport of Crcontaining species from steel interconnects into the oxygen electrode and LSC bond layers in SOECs, and (2) cation segregation and phase separation in the bond layer. INL conducted a workshop October 27, 2008 to discuss possible causes of degradation in a SOEC stack. Generally, it was agreed that the following are major degradation issues relating to SOECs: Delamination of the O2-electrode and bond layer on the steam/O2-electrode side Contaminants (Ni, Cr, Si, etc.) on reaction sites (triple phase boundary) Loss of electrical/ionic conductivity of electrolyte.

M.S. Sohal; J.E. O'Brien; C.M. Stoots; J. J. Hartvigsen; D. Larsen; S. Elangovan; J.S. Herring; J.D. Carter; V.I. Sharma; B. Yildiz

2009-05-01T23:59:59.000Z

74

The Mixed Waste Management Facility. Preliminary design review  

SciTech Connect (OSTI)

This document presents information about the Mixed Waste Management Facility. Topics discussed include: cost and schedule baseline for the completion of the project; evaluation of alternative options; transportation of radioactive wastes to the facility; capital risk associated with incineration; radioactive waste processing; scaling of the pilot-scale system; waste streams to be processed; molten salt oxidation; feed preparation; initial operation to demonstrate selected technologies; floorplans; baseline revisions; preliminary design baseline; cost reduction; and project mission and milestones.

NONE

1995-12-31T23:59:59.000Z

75

LOW-TEMPERATURE, ANODE-SUPPORTED HIGH POWER DENSITY SOLID OXIDE FUEL CELLS WITH NANOSTRUCTURED ELECTRODES  

SciTech Connect (OSTI)

This report summarizes the work done during the entire project period, between October 1, 1999 and March 31, 2003, which includes a six-month no-cost extension. During the project, eight research papers have, either been, published, accepted for publication, or submitted for publication. In addition, several presentations have been made in technical meetings and workshops. The project also has provided support for four graduate students working towards advanced degrees. The principal technical objective of the project was to analyze the role of electrode microstructure on solid oxide fuel cell performance. Prior theoretical work conducted in our laboratory demonstrated that the particle size of composite electrodes has a profound effect on cell performance; the finer the particle size, the lower the activation polarization, the better the performance. The composite cathodes examined consisted of electronically conducting perovskites such as Sr-doped LaMnO{sub 3} (LSM) or Sr-doped LaCoO{sub 3} (LSC), which is also a mixed conductor, as the electrocatalyst, and yttria-stabilized zirconia (YSZ) or rare earth oxide doped CeO{sub 2} as the ionic conductor. The composite anodes examined were mixtures of Ni and YSZ. A procedure was developed for the synthesis of nanosize YSZ by molecular decomposition, in which unwanted species were removed by leaching, leaving behind nanosize YSZ. Anode-supported cells were made using the as-synthesized powders, or using commercially acquired powders. The electrolyte was usually a thin ({approx}10 microns), dense layer of YSZ, supported on a thick ({approx}1 mm), porous Ni + YSZ anode. The cathode was a porous mixture of electrocatalyst and an ionic conductor. Most of the cell testing was done at 800 C with hydrogen as fuel and air as the oxidant. Maximum power densities as high as 1.8 W/cm{sup 2} were demonstrated. Polarization behavior of the cells was theoretically analyzed. A limited amount of cell testing was done using liquid hydrocarbon fuels where reforming was achieved internally. Significant polarization losses also occur at the anode, especially at high fuel utilizations. An analysis of polarization losses requires that various contributions are isolated, and their dependence on pertinent parameters is quantitatively described. An investigation of fuel composition on gas transport through porous anodes was investigated and the role of fuel diluents was explored. This work showed that the molecular weight of the diluent has a significant effect on anode concentration polarization. This further showed that the presence of some molecular hydrogen is necessary to minimize polarization losses. Theoretical analysis has shown that the electrode microstructure has a profound effect on cell performance. In a series of experiments, cathode microstructural parameters were varied, without altering other parameters. Cathode microstructural parameters, especially three phase boundary (TPB) length, were estimated using techniques in quantitative stereology. Cell performance was quantitatively correlated with the relevant microstructural parameters, and charge transfer resistivity was explicitly evaluated. This is the first time that a fundamental parameter, which governs the activation polarization, has been quantitatively determined. An important parameter, which governs the cathodic activation polarization, and thus cell performance, is the ionic conductivity of the composite cathode. The traditional composite cathode is a mixture of LSM and YSZ. It is well known that Sr and Mg-doped LaGaO{sub 3} (LSGM), exhibits higher oxygen ion conductivity compared to YSZ. Cells were fabricated with composite cathodes comprising a mixture of LSM and LSGM. Studies demonstrated that LSGM-based composite cathodes exhibit excellent behavior. Studies have shown that Ni + YSZ is an excellent anode. In fact, in most cells, the principal polarization losses, at least at low fuel utilizations, are associated with the cathode. Theoretical analysis conducted in our group has also shown that anode-supported cells exhibi

Professor Anil V. Virkar

2003-05-23T23:59:59.000Z

76

Argonne Physics Division - ATLAS  

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

Facility Facility Stable Beams Radioactive Beams CARIBU Beams Floorplan Phone Map Experimental Equipment Control System (internal) The ATLAS Facility ATLAS Operations Group The ATLAS Operations Group. ATLAS (the Argonne Tandem Linac Accelerator System) is the world's first superconducting accelerator for projectiles heavier than the electron. This unique system is a DOE National Collaborative Research Facility open to scientists from all over the world. ATLAS consists of a sequence of machines where each accelerates charged atoms and then feeds the beam into the next section for additional energy gain. The beams are provided by one of two 'injector' accelerators, either a 9 million volt (MV) electrostatic tandem Van de Graff, or a new 12-MV low-velocity linac and electron